:root {
    /* Blue Premium Theme */
    --primary: #3b82f6;
    --primary-dark: #2563eb;
    --primary-light: #60a5fa;
    --secondary: #10b981;
    /* Green becomes secondary/success accent */
    --success: #10b981;
    --error: #ef4444;
    --warning: #f59e0b;
    --background: #0f172a;
    --surface: #1e293b;
    --surface-elevated: #334155;
    --text-main: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --border: rgba(255, 255, 255, 0.1);
    --border-light: rgba(255, 255, 255, 0.05);
    --shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.5);
    --radius: 16px;
    --radius-lg: 24px;
    --radius-sm: 12px;

    /* Option States */
    --opt-bg: rgba(255, 255, 255, 0.03);
    --opt-hover: rgba(255, 255, 255, 0.06);
    --opt-border-hover: var(--primary);

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--primary), var(--primary-dark));
}

/* Light Mode Override */
body.light-mode {
    --primary: #059669;
    --primary-dark: #047857;
    --primary-light: #10B981;
    --background: #F8FAFC;
    --surface: #FFFFFF;
    --surface-elevated: #F1F5F9;
    --text-main: #0F172A;
    --text-secondary: #475569;
    --text-muted: #94A3B8;
    --border: #E2E8F0;
    --border-light: #CBD5E1;
    --shadow: 0 4px 20px -4px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 10px 40px -10px rgba(0, 0, 0, 0.12);

    --opt-bg: #F8FAFC;
    --opt-hover: #ECFDF5;
    --opt-border-hover: #A7F3D0;

    /* Premium Light Background */
    background: 
        radial-gradient(circle at 0% 0%, rgba(16, 185, 129, 0.05) 0%, transparent 30%),
        radial-gradient(circle at 100% 100%, rgba(59, 130, 246, 0.05) 0%, transparent 30%),
        #F8FAFC !important;
    background-image: none !important;
}

/* Mural Theme Override - Premium Social Feed Vibe */
body.mural-theme {
    --background: #0f172a;
    --surface: rgba(30, 41, 59, 0.7); 
    --surface-elevated: rgba(51, 65, 85, 0.8);
    --border: rgba(255, 255, 255, 0.1);
    --primary: #ec4899;
    --primary-dark: #be185d;
    --gradient-primary: linear-gradient(135deg, #ec4899, #be185d);
    
    /* Layered Background: Noise + Radial Glows + Deep Gradient */
    background: 
        /* Texture Grain */
        url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)' opacity='0.04'/%3E%3C/svg%3E"),
        /* Pinkish Glow Top Right */
        radial-gradient(circle at 80% 20%, rgba(236, 72, 153, 0.15) 0%, transparent 50%),
        /* Purple Glow Bottom Left */
        radial-gradient(circle at 20% 80%, rgba(139, 92, 246, 0.1) 0%, transparent 50%),
        /* Deep Base Gradient */
        linear-gradient(135deg, #0f172a 0%, #1e1b4b 100%);
    background-attachment: fixed;
    backdrop-filter: none;
}

body.light-mode.mural-theme {
    --background: #fdf2f8; 
    --surface: #ffffff;
    --surface-elevated: #fce7f3;
    --border: #fbcfe8;
    --primary: #ec4899;
    --primary-dark: #be185d;
    --gradient-primary: linear-gradient(135deg, #ec4899, #be185d);
    background: 
        radial-gradient(circle at 10% 10%, rgba(236, 72, 153, 0.05) 0%, transparent 40%),
        radial-gradient(circle at 90% 90%, rgba(139, 92, 246, 0.05) 0%, transparent 40%),
        #fdf2f8;
    background-image: none !important;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Smooth transitions for theme switching */
*,
*::before,
*::after {
    transition: background-color 0.25s ease,
        color 0.25s ease,
        border-color 0.25s ease,
        box-shadow 0.25s ease;
}

body {
    background-color: var(--background);
    background: 
        /* Grain Texture */
        url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)' opacity='0.03'/%3E%3C/svg%3E"),
        /* Subtle Grid Pattern */
        linear-gradient(to right, rgba(255,255,255,0.015) 1px, transparent 1px),
        linear-gradient(to bottom, rgba(255,255,255,0.015) 1px, transparent 1px),
        /* Ambient Glows (Mesh) */
        radial-gradient(circle at 10% 10%, rgba(59, 130, 246, 0.08) 0%, transparent 40%),
        radial-gradient(circle at 90% 90%, rgba(6, 182, 212, 0.06) 0%, transparent 40%),
        /* Edge Vignette */
        radial-gradient(circle, transparent 60%, rgba(15, 23, 42, 0.3) 100%),
        /* Base Deep Navy/Purple Gradient */
        linear-gradient(135deg, #0f172a 0%, #1e1b4b 100%);
    background-size: 100% 100%, 80px 80px, 80px 80px, 100% 100%, 100% 100%, 100% 100%, 100% 100%;
    background-attachment: fixed;
    color: var(--text-main);
    display: flex;
    justify-content: center;
    min-height: 100vh;
    padding: 20px;
}

/* Affiliate Dashboard Specifics */
#afiliados-screen .form-group input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

#afiliados-screen table th {
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-size: 0.75rem;
}

#afiliados-screen table tr:hover {
    background: rgba(255, 255, 255, 0.02);
}

.app-container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.unit-card.locked {
    position: relative;
    filter: grayscale(0.5);
    border-color: rgba(59, 130, 246, 0.2);
}

.unit-card.locked::after {
    content: '🔒';
    position: absolute;
    top: 12px;
    right: 12px;
    font-size: 1.2rem;
    opacity: 0.8;
}

.unit-card:hover {
    transform: translateY(-8px) scale(1.02);
    border-color: var(--primary);
    box-shadow: var(--shadow-lg);
}

/* Header */
.main-header {
    background: var(--surface);
    padding: 16px 20px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
    gap: 12px;
    position: relative;
}

.header-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
}

.logo {
    display: flex;
    align-items: center;
    text-decoration: none;
    cursor: pointer;
    flex-shrink: 0;
}

.logo-image {
    height: 44px;
    width: auto;
    border-radius: 8px;
    object-fit: contain;
}

.header-info {
    display: flex;
    flex-direction: column;
    gap: 2px;
    flex: 1;
    min-width: 0;
}

.header-title-row {
    display: flex;
    align-items: center;
    gap: 8px;
}

.header-emoji {
    font-size: 1.3rem;
}

.header-emoji:empty {
    display: none;
}

.header-info h1 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-main);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.user-greeting {
    font-weight: 600; 
    font-size: 0.85rem;
}

@media (max-width: 600px) {
    .user-greeting {
        display: none !important;
    }
}

.logo-icon {
    font-size: 1.5rem;
}

.theme-toggle {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-main);
    padding: 8px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-toggle:hover {
    background: var(--opt-hover);
}

.progress-container {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.progress-label {
    display: flex;
    justify-content: space-between;
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.progress-bar-bg {
    height: 8px;
    background: var(--border);
    border-radius: 99px;
    overflow: hidden;
}

.progress-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--primary-dark));
    border-radius: 99px;
    transition: width 0.3s ease;
}

/* User Account Area */
.header-user-area {
    display: flex;
    align-items: center;
    gap: 12px;
    position: relative;
}

.btn-header-action {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-main);
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.2s;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.btn-header-action:hover {
    background: var(--opt-hover);
    border-color: var(--text-secondary);
}

.btn-header-primary {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
}

.btn-header-primary:hover {
    background: var(--primary-dark);
}

.user-badge {
    font-size: 0.7rem;
    padding: 4px 8px;
    border-radius: 99px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.badge-free {
    background: rgba(148, 163, 184, 0.2);
    color: var(--text-secondary);
    border: 1px solid var(--border);
}

.badge-premium {
    background: linear-gradient(135deg, #F59E0B, #D97706);
    color: #fff;
    border: 1px solid #B45309;
    box-shadow: 0 2px 4px rgba(245, 158, 11, 0.2);
}

.user-avatar-btn {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--surface-elevated);
    border: 1px solid var(--border);
    color: var(--text-main);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    position: relative;
}

.user-avatar-btn:hover {
    border-color: var(--primary);
    transform: scale(1.05);
}

.user-dropdown {
    position: absolute;
    top: 120%;
    right: 0;
    width: 200px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    padding: 8px;
    display: flex;
    flex-direction: column;
    gap: 4px;
    z-index: 100;
    transform-origin: top right;
    animation: scaleIn 0.2s ease;
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.95);
    }

    to {
        opacity: 1;
        transform: scale(1);
    }
}

.dropdown-item {
    padding: 10px 12px;
    color: var(--text-main);
    text-decoration: none;
    font-size: 0.9rem;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    transition: all 0.2s;
}

.dropdown-item:hover {
    background: var(--opt-hover);
}

.dropdown-divider {
    height: 1px;
    background: var(--border);
    margin: 4px 0;
}

/* Screens */
.screen {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.4s ease, transform 0.4s ease;
}

.screen.hidden {
    display: none;
    opacity: 0;
    pointer-events: none;
}

.hidden {
    display: none !important;
}

.screen.active {
    animation: slideIn 0.5s ease-out;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Hero Section */
.hero-card {
    background: var(--surface);
    padding: 36px 28px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    text-align: center;
    position: relative;
    border: 1px solid var(--border);
}

.hero-card::before {
    content: '';
    position: absolute;
    inset: -2px;
    border-radius: calc(var(--radius-lg) + 2px);
    background: var(--gradient-primary);
    z-index: -1;
    opacity: 0.3;
}

.hero-card h2 {
    font-size: 1.6rem;
    margin-bottom: 14px;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Image Zoom Modal */
.image-modal {
    position: fixed;
    z-index: 10000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0, 0, 0, 0.9);
    display: flex;
    justify-content: center;
    align-items: center;
    animation: fadeIn 0.3s;
}

.modal-content {
    margin: auto;
    display: block;
    max-width: 90%;
    max-height: 90vh;
    border-radius: 8px;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.5);
    animation: zoom 0.3s;
}

.close-modal {
    position: absolute;
    top: 15px;
    right: 35px;
    color: #f1f1f1;
    font-size: 40px;
    font-weight: bold;
    transition: 0.3s;
    cursor: pointer;
}

.close-modal:hover,
.close-modal:focus {
    color: #bbb;
    text-decoration: none;
    cursor: pointer;
}

/* Option Styles Update */
.option-btn {
    width: 100%;
    background: var(--surface);
    border: 1px solid var(--border);
    color: var(--text-main);
    text-align: left;
    margin-bottom: 1px;
    position: relative;
    padding: 16px;
    border-radius: var(--radius);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.opt-row {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    width: 100%;
    gap: 12px;
}

.opt-content {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    flex: 1;
    line-height: 1.5;
}

.opt-letter {
    min-width: 24px;
}

.opt-scissors {
    opacity: 0.8;
    cursor: pointer;
    font-size: 1.1rem;
    transition: all 0.2s;
    padding: 4px;
}

body.light-mode .opt-scissors {
    opacity: 1;
    filter: brightness(0.8);
    /* Make it slightly darker/more visible */
}

.opt-scissors:hover {
    opacity: 1;
    transform: scale(1.1);
}

.option-btn.eliminated {
    border-color: var(--border);
    background: var(--background);
}

.option-btn.eliminated .opt-content {
    text-decoration: line-through;
    opacity: 0.5;
}

.option-btn.eliminated .opt-scissors {
    opacity: 1;
    filter: grayscale(100%);
}

.opt-stats {
    width: 100%;
    font-size: 0.75rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 0;
    opacity: 0;
    height: 0;
    overflow: hidden;
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.options-container.answered .opt-stats {
    opacity: 0.8;
    height: auto;
    margin-top: 4px;
    padding-bottom: 4px;
}

.stat-bar {
    height: 4px;
    background: var(--primary);
    border-radius: 2px;
    opacity: 0.3;
}

/* Mobile Image Optimizations */
/* Image Optimizations (Main Column) */
#q-image-container {
    display: flex;
    justify-content: center;
    margin-bottom: 24px;
    width: 100%;
    background: rgba(0, 0, 0, 0.1);
    /* Slight background for better contrast if image is transparent */
    border-radius: var(--radius);
    padding: 12px;
}

#q-image-container img {
    max-height: 400px;
    width: auto;
    max-width: 100%;
    cursor: zoom-in;
    border-radius: 8px;
    transition: transform 0.2s;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

#q-image-container img:hover {
    transform: scale(1.02);
}

@media (max-width: 768px) {
    #q-image-container img {
        max-height: 250px;
    }

    .option-btn {
        padding: 14px;
    }

    .opt-content {
        font-size: 0.95rem;
    }
}

.hero-card p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 32px;
    font-size: 1.05rem;
}

.features-grid {
    display: grid;
    gap: 14px;
    text-align: left;
    margin-bottom: 32px;
}

.feature {
    display: flex;
    align-items: center;
    gap: 14px;
    background: var(--background);
    padding: 14px 16px;
    border-radius: var(--radius-sm);
    font-weight: 500;
    border: 1px solid var(--border);
    transition: all 0.25s ease;
}

.feature:hover {
    border-color: var(--primary);
    transform: translateX(4px);
}

.feature .icon {
    font-size: 1.3rem;
}

/* Buttons */
.btn-primary,
.btn-secondary {
    border: none;
    border-radius: var(--radius-sm);
    padding: 14px 28px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}


.btn-primary:focus-visible,
.btn-secondary:focus-visible,
.option-btn:focus-visible {
    outline: 3px solid var(--primary);
    outline-offset: 2px;
}

.btn-primary {
    background: var(--gradient-primary);
    color: #FFFFFF;
    box-shadow: 0 4px 14px -4px rgba(16, 185, 129, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px -8px rgba(16, 185, 129, 0.5);
}

body:not(.light-mode) .btn-primary {
    color: #0A1628;
}

.btn-primary:active {
    transform: translateY(0) scale(0.98);
}

.btn-primary.large {
    font-size: 1.15rem;
    padding: 18px 32px;
}

.btn-secondary {
    background: var(--background);
    color: var(--text-main);
    border: 1px solid var(--border);
}

/* Quiz Interface */
.quiz-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 4px;
    padding: 0 4px;
}

.block-info {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 600;
    display: flex;
    gap: 8px;
}

.progress-dots {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
}

.dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--border);
    transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
}

.dot:hover {
    transform: scale(1.2);
    background: var(--border-light);
}

.dot.active {
    transform: scale(1.6);
    box-shadow: 0 0 0 3px var(--surface), 0 0 0 5px var(--primary);
    background: var(--primary);
}

.dot.correct {
    background: var(--success);
}

.dot.wrong {
    background: var(--error);
}

/* Ensure active status doesn't override color if correct/wrong, 
   but does if neutral */
.dot.active.correct {
    box-shadow: 0 0 0 3px var(--surface), 0 0 0 5px var(--success);
}

.dot.active.wrong {
    box-shadow: 0 0 0 3px var(--surface), 0 0 0 5px var(--error);
}

.question-card {
    background: var(--surface);
    padding: 32px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    position: relative;
    overflow: hidden;
    border: 1px solid var(--border);
    transform-style: preserve-3d;
    transition: transform 0.3s ease;
}

.question-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
}

.tags-container {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.tag {
    font-size: 0.7rem;
    padding: 6px 12px;
    border-radius: 999px;
    text-transform: uppercase;
    font-weight: 700;
    letter-spacing: 0.8px;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    animation: tagIn 0.4s ease;
}

@keyframes tagIn {
    from {
        opacity: 0;
        transform: translateY(-8px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.tag.high-yield {
    background: linear-gradient(135deg, #FEF3C7, #FDE68A);
    color: #B45309;
    border: 1px solid #FCD34D;
}

.tag.trap {
    background: linear-gradient(135deg, #FEE2E2, #FECACA);
    color: #B91C1C;
    border: 1px solid #FCA5A5;
}

/* Tag adjustments for dark mode readability */
body:not(.light-mode) .tag.high-yield {
    background: linear-gradient(135deg, #78350F, #92400E);
    color: #FCD34D;
    border: 1px solid #D97706;
}

body:not(.light-mode) .tag.trap {
    background: linear-gradient(135deg, #7F1D1D, #991B1B);
    color: #FCA5A5;
    border: 1px solid #DC2626;
}

.source-label {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-secondary);
    background: var(--surface-elevated);
    padding: 2px 8px;
    border-radius: 4px;
    margin-bottom: 8px;
    border: 1px solid var(--border);
    letter-spacing: 0.5px;
}

.question-text {
    font-size: 1.25rem;
    line-height: 1.6;
    margin-bottom: 28px;
    color: var(--text-main);
    font-weight: 500;
}

.options-container {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.option-btn {
    background: var(--opt-bg);
    border: 1px solid var(--border);
    padding: 18px 20px;
    border-radius: var(--radius);
    text-align: left;
    font-size: 1.05rem;
    line-height: 1.5;
    color: var(--text-main);
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
}

.option-btn::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: var(--radius);
    background: var(--gradient-primary);
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: -1;
}

.option-btn:hover:not(:disabled) {
    background: var(--opt-hover);
    border-color: var(--primary);
    transform: translateY(-2px) scale(1.01);
    box-shadow: 0 8px 24px -8px rgba(16, 185, 129, 0.25);
}

.option-btn:active:not(:disabled) {
    transform: translateY(0) scale(0.99);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.option-btn.selected {
    border-width: 2px;
    border-color: var(--primary);
    background: var(--opt-hover);
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.15);
}

.option-btn.correct {
    border-width: 2px;
    background: linear-gradient(135deg, #ECFDF5, #D1FAE5);
    border-color: var(--success);
    color: #065F46;
    animation: correctPulse 0.6s ease;
}

.option-btn.correct::after {
    content: '✓';
    position: absolute;
    right: 16px;
    font-size: 1.25rem;
    font-weight: bold;
    color: var(--success);
    animation: checkIn 0.3s ease;
}

body:not(.light-mode) .option-btn.correct {
    background: linear-gradient(135deg, #064E3B, #065F46);
    border-color: #34D399;
    color: #D1FAE5;
}

.option-btn.wrong {
    border-width: 2px;
    background: linear-gradient(135deg, #FEF2F2, #FEE2E2);
    border-color: var(--error);
    color: #991B1B;
    animation: shake 0.5s ease;
}

.option-btn.wrong::after {
    content: '✗';
    position: absolute;
    right: 16px;
    font-size: 1.25rem;
    font-weight: bold;
    color: var(--error);
}

body:not(.light-mode) .option-btn.wrong {
    background: linear-gradient(135deg, #7F1D1D, #991B1B);
    border-color: #F87171;
    color: #FEE2E2;
}

@keyframes correctPulse {

    0%,
    100% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.02);
    }
}

@keyframes checkIn {
    0% {
        opacity: 0;
        transform: scale(0);
    }

    100% {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes shake {

    0%,
    100% {
        transform: translateX(0);
    }

    20%,
    60% {
        transform: translateX(-4px);
    }

    40%,
    80% {
        transform: translateX(4px);
    }
}

.feedback-area {
    margin-top: 16px;
    animation: slideUp 0.3s ease;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.feedback-content {
    background: var(--surface);
    padding: 16px;
    border-radius: 12px;
    border-left: 4px solid var(--primary);
    margin-bottom: 16px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

body.dark-mode .feedback-content {
    background: var(--background);
    /* Slightly different contrast */
}

.feedback-content.success {
    border-color: var(--success);
}

.feedback-content.error {
    border-color: var(--error);
}

#feedback-title {
    font-size: 0.9rem;
    margin-bottom: 4px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.success #feedback-title {
    color: var(--success);
}

.error #feedback-title {
    color: var(--error);
}

/* Results */
.result-card {
    background: var(--surface);
    padding: 32px 24px;
    border-radius: var(--radius);
    text-align: center;
    box-shadow: var(--shadow);
    max-height: 80vh;
    overflow-y: auto;
}

.score-circle {
    position: relative;
    width: 150px;
    height: 150px;
    margin: 32px auto 48px auto;
    /* Increased bottom margin to avoid text overlap */
}

.circular-chart {
    display: block;
    margin: 0 auto;
    max-width: 100%;
    max-height: 250px;
}

.circle-bg {
    fill: none;
    stroke: var(--border);
    stroke-width: 3.8;
}

.circle {
    fill: none;
    stroke-width: 2.8;
    stroke-linecap: round;
    animation: progress 1s ease-out forwards;
    transition: stroke 0.3s;
}

.circle.high {
    stroke: var(--success);
}

.circle.med {
    stroke: var(--warning);
}

.circle.low {
    stroke: var(--error);
}

.percentage {
    fill: var(--text-main);
    font-family: 'Inter', sans-serif;
    font-weight: bold;
    font-size: 0.5em;
    text-anchor: middle;
}

.score-text {
    margin-top: 16px;
    font-weight: 500;
    color: var(--text-secondary);
    position: absolute;
    bottom: -30px;
    /* Position it clearly below the circle */
    left: 0;
    width: 100%;
    text-align: center;
}

.pedagogical-insight {
    margin-top: 24px;
    margin-bottom: 24px;
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--text-main);
    line-height: 1.4;
}

.insight-box {
    background: #f0f9ff;
    padding: 16px;
    border-radius: 12px;
    text-align: left;
    margin-bottom: 24px;
    display: flex;
    gap: 12px;
}

body.dark-mode .insight-box {
    background: #0c4a6e;
    /* Darker blue bg */
}

.insight-box .icon {
    font-size: 1.5rem;
}

.insight-box h4 {
    color: #0369a1;
    margin-bottom: 4px;
    font-size: 0.95rem;
}

body.dark-mode .insight-box h4 {
    color: #38bdf8;
}

.insight-box p {
    font-size: 0.9rem;
    color: #334155;
}

body.dark-mode .insight-box p {
    color: #e2e8f0;
}

.action-buttons {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    /* Allow wrapping on small screens */
    margin-bottom: 12px;
}

.action-buttons button {
    flex: 1;
}

/* Error Review List */
.error-review-list {
    text-align: left;
    margin-top: 24px;
    background: var(--background);
    padding: 16px;
    border-radius: 12px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.review-item {
    border-bottom: 1px solid var(--border);
    padding-bottom: 12px;
}

.review-item:last-child {
    border-bottom: none;
}

.review-question {
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-main);
}

.review-answer {
    font-size: 0.85rem;
    color: var(--success);
}

.review-explanation {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 4px;
    font-style: italic;
}

.review-choice {
    font-size: 0.85rem;
    margin-top: 4px;
    padding: 4px 8px;
    border-radius: 4px;
}

.review-choice.wrong {
    background: #fee2e2;
    color: #991b1b;
}

.review-choice.correct {
    background: #dcfce7;
    color: #166534;
}

body.dark-mode .review-choice.wrong {
    background: #7f1d1d;
    color: #fecaca;
}

body.dark-mode .review-choice.correct {
    background: #064e3b;
    color: #a7f3d0;
}

/* Scrollbar styling */
.result-card::-webkit-scrollbar {
    width: 8px;
}

.result-card::-webkit-scrollbar-track {
    background: transparent;
}

.result-card::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 4px;
}

@media (max-width: 768px) {
    .quiz-content-grid {
        grid-template-columns: 1fr;
    }

    .quiz-side-col {
        order: -1;
        /* Show side panel above question on mobile */
    }

    .visual-context-card {
        position: static;
        min-height: 200px;
    }
}

@media (max-width: 480px) {
    body {
        padding: 12px;
    }

    .hero-card {
        padding: 24px 16px;
    }

    .question-text {
        font-size: 1rem;
    }

    .app-container {
        gap: 16px;
    }

    .quiz-header {
        flex-direction: column;
        gap: 8px;
        align-items: flex-start;
    }

    .option-btn {
        padding: 12px;
        font-size: 0.95rem;
    }
}

/* Quiz Controls (Previous Button) */
.quiz-controls {
    margin-top: 16px;
    display: flex;
    justify-content: flex-start;
}

#prev-btn {
    min-width: 120px;
}

.header-subtitle {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-top: 4px;
    line-height: 1.3;
}

/* Quiz Content Grid */
.quiz-content-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 24px;
}

@media (min-width: 768px) {
    .quiz-content-grid {
        grid-template-columns: 1.2fr 0.8fr;
        align-items: start;
    }
}

/* Side Panel */
.visual-context-card {
    background: var(--surface);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
    gap: 24px;
    min-height: 300px;
    /* Ensure some height if empty */
    justify-content: center;
    align-items: center;
    text-align: center;
    position: sticky;
    top: 24px;
}

.context-image-wrapper {
    width: 100%;
    border-radius: 12px;
    overflow: hidden;
    background: var(--background);
    border: 1px solid var(--border);
}

.context-image-wrapper img {
    width: 100%;
    height: auto;
    display: block;
    object-fit: cover;
}

.context-tip-wrapper {
    background: #f0fdf4;
    /* Light green/mint for tips */
    border: 1px solid #bbf7d0;
    padding: 16px;
    border-radius: 12px;
    width: 100%;
    text-align: left;
}

body.dark-mode .context-tip-wrapper {
    background: #064e3b;
    border-color: #059669;
}

.tip-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
    color: #15803d;
    /* dark green */
}

body.dark-mode .tip-header {
    color: #a7f3d0;
}

.tip-header h4 {
    font-size: 0.95rem;
    font-weight: 700;
}

.context-tip-wrapper p {
    font-size: 0.9rem;
    line-height: 1.5;
    color: #14532d;
}

body.dark-mode .context-tip-wrapper p {
    color: #d1fae5;
}

/* Tip Reveal Toggle */
.tip-reveal-btn {
    background: none;
    border: 1px solid rgba(21, 128, 61, 0.3);
    border-radius: 8px;
    cursor: pointer;
    padding: 4px 10px;
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: 4px;
    transition: all 0.2s ease;
    font-size: 1rem;
    line-height: 1;
}

.tip-reveal-btn:hover {
    background: rgba(21, 128, 61, 0.1);
    border-color: rgba(21, 128, 61, 0.5);
    transform: scale(1.05);
}

body.dark-mode .tip-reveal-btn {
    border-color: rgba(167, 243, 208, 0.3);
}

body.dark-mode .tip-reveal-btn:hover {
    background: rgba(167, 243, 208, 0.1);
    border-color: rgba(167, 243, 208, 0.5);
}

/* Tip text hidden state */
#q-tip-text.tip-hidden {
    filter: blur(6px);
    user-select: none;
    pointer-events: none;
    transition: filter 0.3s ease;
}

#q-tip-text.tip-visible {
    filter: blur(0);
    user-select: auto;
    pointer-events: auto;
    transition: filter 0.3s ease;
}

.placeholder-context {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    opacity: 0.5;
}

.placeholder-icon {
    font-size: 4rem;
    color: var(--text-secondary);
}

.placeholder-context p {
    color: var(--text-secondary);
    font-weight: 500;
}

/* Utilities */
.hidden {
    display: none !important;
}

/* Units Grid Selection Screen */
.hero {
    text-align: center;
    margin-bottom: 32px;
}

.hero h2 {
    font-size: 2rem;
    margin-bottom: 12px;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

.units-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 24px;
    padding-bottom: 40px;
}

@media (min-width: 1024px) {
    .units-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1400px) {
    .units-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}


.unit-card {
    background: var(--surface);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow);
    transition: transform 0.2s, box-shadow 0.3s, border-color 0.3s;
    cursor: pointer;
    border: 2px solid transparent;
    display: flex;
    flex-direction: column;
}

.unit-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.2);
    border-color: var(--primary);
}

.unit-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 16px;
}

.unit-icon {
    font-size: 2.5rem;
    background: rgba(56, 189, 248, 0.1);
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
}

.unit-id {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.unit-title {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 8px;
    line-height: 1.3;
}

.unit-subtitle {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: auto;
    line-height: 1.4;
}

.unit-stats {
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
}

.unit-count {
    color: var(--text-secondary);
    font-weight: 500;
}

.unit-progress-text {
    color: var(--primary);
    font-weight: 600;
}

/* --- Quiz Timer --- */
.quiz-timer {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background-color: rgba(239, 68, 68, 0.1);
    color: #ef4444;
    /* Red color for urgency */
    padding: 0.5rem 1rem;
    border-radius: 9999px;
    font-weight: 600;
    font-size: 1rem;
    border: 1px solid rgba(239, 68, 68, 0.2);
    margin-left: auto;
    /* Push to right if in flex container */
    animation: pulse-red 2s infinite;
}

.quiz-timer.hidden {
    display: none !important;
}

.timer-icon {
    font-size: 1.2rem;
}

@keyframes pulse-red {
    0% {
        box-shadow: 0 0 0 0 rgba(239, 68, 68, 0.4);
    }

    70% {
        box-shadow: 0 0 0 6px rgba(239, 68, 68, 0);
    }

    100% {
        box-shadow: 0 0 0 0 rgba(239, 68, 68, 0);
    }
}

/* Adjust quiz header to accommodate timer */
.quiz-header {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    align-items: center;
}

/* ============================================
   MOBILE QUIZ OPTIMIZATIONS (≤768px)
   - Não afeta layout desktop
   - Foco em experiência fluida e rápida
   ============================================ */

@media (max-width: 768px) {

    /* Fix body layout on mobile to prevent left-edge clipping */
    body {
        display: block;
        padding: 16px;
        min-height: 100vh;
        /* Ensure full height */
    }

    .app-container {
        margin: 0 auto;
        width: 100%;
        max-width: 100%;
        gap: 16px;
    }

    /* --- 1. IMAGENS: Redução ~15-20%, máximo 40% da altura da tela --- */
    #q-image-container {
        padding: 8px;
        margin-bottom: 16px;
    }

    #q-image-container img {
        max-height: min(35vh, 200px);
        /* Limita a ~35% viewport ou 200px */
        width: auto;
        max-width: 85%;
        /* Levemente menor */
    }

    /* --- 2. ALTERNATIVAS: Maior área de toque e espaçamento --- */
    .options-container {
        gap: 16px;
        /* Aumenta espaçamento (era 14px) */
    }

    .option-btn {
        min-height: 56px;
        /* Área de toque mínima recomendada */
        padding: 18px 16px;
        font-size: 1rem;
    }

    .opt-content {
        font-size: 1rem;
        line-height: 1.5;
    }

    .opt-scissors {
        padding: 8px;
        /* Maior área de toque para tesoura */
        font-size: 1.2rem;
    }

    /* --- 3. BOTÃO "PRÓXIMA QUESTÃO": Posição sticky após resposta --- */
    #next-btn {
        position: sticky;
        bottom: 16px;
        z-index: 100;
        margin-top: 20px;
        box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.4);
        border-radius: var(--radius);
    }

    /* --- 4. OTIMIZAÇÕES GERAIS: Minimizar scroll --- */
    .question-card {
        padding: 20px 16px;
    }

    .question-text {
        font-size: 1.05rem;
        margin-bottom: 20px;
        line-height: 1.55;
    }

    .tags-container {
        margin-bottom: 14px;
        gap: 8px;
    }

    .tag {
        font-size: 0.65rem;
        padding: 4px 10px;
    }

    /* Ocultar sidebar no mobile (imagem já está inline na questão) */
    .quiz-side-col {
        display: none;
    }

    /* Ajustar grid para coluna única */
    .quiz-content-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    /* Feedback mais compacto */
    .feedback-area {
        margin-top: 12px;
    }

    .feedback-content {
        padding: 14px;
        margin-bottom: 12px;
    }

    /* Quiz header mais compacto */
    .quiz-header {
        gap: 8px;
        margin-bottom: 8px;
        padding: 0;
    }

    .block-info {
        font-size: 0.85rem;
    }

    .progress-dots {
        gap: 4px;
    }

    .dot {
        width: 8px;
        height: 8px;
    }
}

/* ============================================
   DESKTOP QUIZ OPTIMIZATIONS (≥769px)
   - Não afeta comportamento mobile
   - Foco em experiência profissional e fluida
   ============================================ */

@media (min-width: 769px) {

    /* --- 1. LAYOUT GRID: Sidebar fixa, questão expande --- */
    .quiz-content-grid {
        grid-template-columns: 1fr 320px;
        gap: 32px;
        align-items: start;
    }

    /* --- 2. QUESTION CARD: Espaçamento refinado --- */
    .question-card {
        padding: 32px;
    }

    .question-text {
        font-size: 1.2rem;
        line-height: 1.65;
        margin-bottom: 28px;
        max-width: 800px;
        /* Limita largura para leitura confortável */
    }

    /* --- 3. ALTERNATIVAS: Espaçamento consistente --- */
    .options-container {
        gap: 16px;
    }

    .option-btn {
        padding: 18px 22px;
        font-size: 1.05rem;
    }

    /* --- 4. BOTÃO "PRÓXIMA": Próximo às alternativas --- */
    #next-btn {
        margin-top: 24px;
        max-width: 320px;
        justify-content: center;
    }

    /* Quando visível, mantém próximo das alternativas */
    #next-btn[style*="display: block"],
    #next-btn[style*="display: inline"] {
        margin-top: 24px;
    }

    /* --- 5. SIDEBAR: Refinamentos visuais --- */
    .visual-context-card {
        min-height: 280px;
        padding: 24px;
    }

    .context-tip-wrapper {
        padding: 18px;
    }

    /* --- 6. QUIZ HEADER: Espaçamento equilibrado --- */
    .quiz-header {
        margin-bottom: 20px;
        padding: 0 4px;
    }

    /* --- 7. FEEDBACK: Melhor apresentação --- */
    .feedback-area {
        margin-top: 20px;
    }

    .feedback-content {
        padding: 18px 20px;
        max-width: 800px;
    }

    /* --- 8. IMAGENS: Mantém tamanho padrão com bom equilíbrio --- */
    #q-image-container {
        margin-bottom: 24px;
    }

    #q-image-container img {
        max-height: 400px;
        max-width: 100%;
    }
}

/* ============================================
   FEEDBACK SIDE PANEL SYSTEM
   - Desktop: Slide-in panel from right
   - Mobile: Inline accordion panels
   ============================================ */

/* --- Feedback Action Buttons --- */
.feedback-buttons {
    display: flex;
    gap: 12px;
    margin-top: 16px;
    flex-wrap: wrap;
}

.feedback-action-btn {
    flex: 1;
    min-width: 140px;
    padding: 14px 20px;
    background: var(--surface-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-main);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.25s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.feedback-action-btn:hover {
    background: var(--opt-hover);
    border-color: var(--primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.15);
}

.feedback-action-btn:active {
    transform: translateY(0);
}

/* --- Panel Overlay (Desktop) --- */
.panel-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 9998;
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
}

.panel-overlay.visible {
    opacity: 1;
    pointer-events: auto;
}

/* --- Side Panel (Desktop) --- */
.feedback-side-panel {
    position: fixed;
    top: 0;
    right: 0;
    width: 420px;
    max-width: 90vw;
    height: 100vh;
    background: var(--surface);
    box-shadow: -8px 0 32px rgba(0, 0, 0, 0.3);
    z-index: 9999;
    transform: translateX(100%);
    transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.feedback-side-panel.visible {
    transform: translateX(0);
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 24px;
    border-bottom: 1px solid var(--border);
    background: var(--surface-elevated);
}

.panel-header h3 {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--text-main);
    margin: 0;
    display: flex;
    align-items: center;
    gap: 8px;
}

.panel-close-btn {
    background: transparent;
    border: none;
    font-size: 1.8rem;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 8px;
    transition: all 0.2s ease;
    line-height: 1;
}

.panel-close-btn:hover {
    background: var(--opt-hover);
    color: var(--text-main);
}

.panel-body {
    flex: 1;
    padding: 24px;
    overflow-y: auto;
}

.panel-section {
    animation: panelFadeIn 0.3s ease;
}

.panel-section p {
    font-size: 1rem;
    line-height: 1.7;
    color: var(--text-main);
}

@keyframes panelFadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* --- Stats Panel Content --- */
.stats-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 16px;
    background: var(--background);
    border-radius: var(--radius-sm);
    margin-bottom: 12px;
    border: 1px solid var(--border);
}

.stats-item.correct-answer {
    border-color: var(--success);
    background: rgba(34, 197, 94, 0.1);
}

.stats-letter {
    font-weight: 700;
    font-size: 1rem;
    min-width: 28px;
    color: var(--text-main);
}

.stats-bar-wrapper {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.stats-bar-bg {
    height: 8px;
    background: var(--border);
    border-radius: 4px;
    overflow: hidden;
}

.stats-bar-fill {
    height: 100%;
    background: var(--primary);
    border-radius: 4px;
    transition: width 0.5s ease;
}

.stats-item.correct-answer .stats-bar-fill {
    background: var(--success);
}

.stats-percentage {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    min-width: 45px;
    text-align: right;
}

/* --- Mobile Accordion Panels --- */
.mobile-feedback-panel {
    margin-top: 12px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    overflow: hidden;
    background: var(--surface);
}

.mobile-panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 14px 16px;
    background: var(--surface-elevated);
    cursor: pointer;
    font-weight: 500;
    color: var(--text-main);
    transition: background 0.2s ease;
}

.mobile-panel-header:hover {
    background: var(--opt-hover);
}

.mobile-panel-chevron {
    font-size: 0.8rem;
    color: var(--text-secondary);
    transition: transform 0.3s ease;
}

.mobile-feedback-panel.expanded .mobile-panel-chevron {
    transform: rotate(180deg);
}

.mobile-panel-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease, padding 0.35s ease;
    padding: 0 16px;
}

.mobile-feedback-panel.expanded .mobile-panel-content {
    max-height: 500px;
    padding: 16px;
}

.mobile-panel-content p {
    font-size: 0.95rem;
    line-height: 1.6;
    color: var(--text-main);
    margin: 0;
}

/* --- Responsive Behavior --- */

/* Desktop: Show side panel, hide mobile accordion */
@media (min-width: 769px) {
    .mobile-feedback-panel {
        display: none !important;
    }
}

/* Mobile: Hide side panel elements, show accordion */
@media (max-width: 768px) {

    .feedback-side-panel,
    .panel-overlay {
        display: none !important;
    }

    .feedback-buttons {
        display: none !important;
    }

    .feedback-action-btn {
        width: 100%;
        padding: 16px;
        font-size: 1rem;
    }

    .mobile-feedback-panel {
        display: block;
    }

    /* Mobile stats items */
    .stats-item {
        padding: 12px 14px;
        margin-bottom: 10px;
    }

    .stats-letter {
        font-size: 0.95rem;
    }

    .stats-percentage {
        font-size: 0.8rem;
    }
}

/* --- Scrollbar for panel (Desktop) --- */
.panel-body::-webkit-scrollbar {
    width: 6px;
}

.panel-body::-webkit-scrollbar-track {
    background: transparent;
}

.panel-body::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 3px;
}

.panel-body::-webkit-scrollbar-thumb:hover {
    background: var(--border-light);
}

/* ============================================
   FLASHCARDS STYLES
   ============================================ */

.flashcard-card {
    width: 100%;
    height: 400px;
    background: var(--surface);
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    cursor: pointer;
    position: relative;
    border: 2px solid var(--border);
    transition: box-shadow 0.35s ease, border-color 0.35s ease, transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
    transform-style: preserve-3d;
    perspective: 1200px;
    user-select: none;
    will-change: transform;
}

.flashcard-card:hover {
    box-shadow: 0 16px 40px rgba(16, 185, 129, 0.18);
    border-color: var(--primary);
    transform: scale(1.015);
}

.flashcard-card:active {
    transform: scale(0.99);
    transition-duration: 0.1s;
}

.flashcard-inner {
    position: relative;
    width: 100%;
    height: 100%;
    transition: transform 0.55s cubic-bezier(0.4, 0.0, 0.2, 1);
    transform-style: preserve-3d;
    will-change: transform;
}

.flashcard-inner.flipped {
    transform: rotateY(180deg);
}

.flashcard-front,
.flashcard-back {
    position: absolute;
    width: 100%;
    height: 100%;
    padding: 40px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    border-radius: var(--radius);
}

.flashcard-front {
    background: linear-gradient(135deg, var(--surface), var(--surface-elevated));
    color: var(--text-main);
    z-index: 2;
    transform: rotateY(0deg) translateZ(1px);
}

.flashcard-back {
    background: linear-gradient(135deg, #059669, #047857);
    color: white;
    transform: rotateY(180deg) translateZ(1px);
    z-index: 1;
}

.flashcard-back p {
    color: #ecfdf5;
}

body.light-mode .flashcard-back {
    background: linear-gradient(135deg, #047857, #065f46);
    color: #ecfdf5;
}

#flashcard-question,
#flashcard-answer {
    font-size: 1.25rem;
    line-height: 1.6;
    font-weight: 500;
    margin: 0;
    color: inherit;
    transition: opacity 0.2s ease;
}

.flashcard-back #flashcard-answer {
    color: #ecfdf5;
}

.flashcard-header {
    margin-bottom: 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
}

#flashcard-counter {
    font-weight: 600;
    min-width: 80px;
    text-align: center;
    transition: opacity 0.2s ease;
}

.flashcard-card.hidden {
    display: none;
}

/* --- Flashcard Progress Bar --- */
.flashcard-progress-bar {
    width: 100%;
    height: 5px;
    background: var(--border);
    border-radius: 3px;
    margin-bottom: 20px;
    overflow: hidden;
}

.flashcard-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), #34d399);
    border-radius: 3px;
    transition: width 0.45s cubic-bezier(0.4, 0, 0.2, 1);
    will-change: width;
}

/* --- Flashcard Nav Buttons --- */
#flashcard-prev-btn,
#flashcard-next-btn {
    transition: all 0.25s ease;
    position: relative;
    overflow: hidden;
}

#flashcard-prev-btn:not(:disabled):hover,
#flashcard-next-btn:not(:disabled):hover {
    transform: scale(1.05);
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.2);
}

#flashcard-prev-btn:not(:disabled):active,
#flashcard-next-btn:not(:disabled):active {
    transform: scale(0.97);
}

#flashcard-prev-btn:disabled,
#flashcard-next-btn:disabled {
    opacity: 0.35;
    cursor: not-allowed;
}

/* --- Slide Animations for Card Navigation --- */
@keyframes fcSlideOutLeft {
    from { opacity: 1; transform: translateX(0); }
    to   { opacity: 0; transform: translateX(-60px); }
}

@keyframes fcSlideInRight {
    from { opacity: 0; transform: translateX(60px); }
    to   { opacity: 1; transform: translateX(0); }
}

@keyframes fcSlideOutRight {
    from { opacity: 1; transform: translateX(0); }
    to   { opacity: 0; transform: translateX(60px); }
}

@keyframes fcSlideInLeft {
    from { opacity: 0; transform: translateX(-60px); }
    to   { opacity: 1; transform: translateX(0); }
}

.fc-slide-out-left {
    animation: fcSlideOutLeft 0.2s ease-out forwards;
}

.fc-slide-in-right {
    animation: fcSlideInRight 0.25s ease-out forwards;
}

.fc-slide-out-right {
    animation: fcSlideOutRight 0.2s ease-out forwards;
}

.fc-slide-in-left {
    animation: fcSlideInLeft 0.25s ease-out forwards;
}

/* --- Click-to-flip hint animation --- */
.flashcard-flip-hint {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-top: 16px;
    margin-bottom: 0;
    animation: fcPulseHint 2.5s ease-in-out infinite;
    display: flex;
    align-items: center;
    gap: 6px;
}

@keyframes fcPulseHint {
    0%, 100% { opacity: 0.5; }
    50% { opacity: 1; }
}

/* --- Swipe Indicator (mobile) --- */
.flashcard-swipe-hint {
    display: none;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.8rem;
    margin-top: 12px;
    gap: 6px;
    align-items: center;
    justify-content: center;
    animation: fcPulseHint 3s ease-in-out infinite;
}

@media (max-width: 768px) {
    .flashcard-swipe-hint {
        display: flex;
    }

    .flashcard-card {
        height: 350px;
    }

    .flashcard-front,
    .flashcard-back {
        padding: 28px 20px;
    }
}

/* ============================================
   MOBILE MENU STYLES
   ============================================ */

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 8px;
    margin-right: 12px;
}

.mobile-menu-btn span {
    width: 24px;
    height: 2px;
    background: var(--text-main);
    border-radius: 2px;
    transition: all 0.3s ease;
}

.mobile-menu-btn.active span:nth-child(1) {
    transform: rotate(45deg) translate(8px, 8px);
}

.mobile-menu-btn.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-btn.active span:nth-child(3) {
    transform: rotate(-45deg) translate(8px, -8px);
}

.mobile-menu-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 999;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.mobile-menu-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.mobile-menu {
    position: fixed;
    top: 0;
    right: 0;
    width: 280px;
    height: 100vh;
    background: var(--surface);
    box-shadow: -4px 0 12px rgba(0, 0, 0, 0.2);
    z-index: 1000;
    transform: translateX(100%);
    transition: transform 0.3s ease;
    overflow-y: auto;
    padding-top: 12px;
}

.mobile-menu.active {
    transform: translateX(0);
}

.mobile-menu-close {
    position: absolute;
    top: 16px;
    right: 16px;
    background: transparent;
    border: none;
    font-size: 32px;
    cursor: pointer;
    color: var(--text-main);
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
}

.mobile-nav-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
}

.mobile-nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 20px;
    color: var(--text-main);
    cursor: pointer;
    transition: all 0.2s ease;
    border-left: 4px solid transparent;
}

.mobile-nav-item:hover {
    background: var(--opt-hover);
    border-left-color: var(--primary);
}

.mobile-nav-item.active {
    background: rgba(16, 185, 129, 0.1);
    border-left-color: var(--primary);
    color: var(--primary);
}

.mobile-nav-icon {
    font-size: 1.3rem;
    width: 24px;
    display: flex;
    align-items: center;
}

/* Show mobile menu on small screens */
@media (max-width: 900px) {
    .mobile-menu-btn {
        display: flex;
    }

    .sidebar {
        display: none;
    }
}

/* ==========================================
   MOBILE RESPONSIVE TWEAKS
   ========================================== */

@media (max-width: 900px) {

    /* Toggle Button Visibility */
    #sidebar-toggle {
        display: flex !important;
    }

    .app-container {
        width: 100%;
        padding: 0;
    }

    .main-header {
        border-radius: 0;
        padding: 12px 16px;
    }

    /* Hide language and theme toggles from header on mobile - they're in the hamburger menu */
    .header-top #language-toggle,
    .header-top #theme-toggle,
    .header-top .header-divider {
        display: none !important;
    }

    /* Hide header subtitle on mobile to save space */
    .header-subtitle {
        display: none;
    }

    /* Back button: compact arrow bottom-left on mobile */
    .header-top #nav-units-btn {
        position: fixed;
        bottom: 20px;
        left: 20px;
        z-index: 900;
        /* Below menu (1000) */
        border-radius: 50%;
        width: 48px;
        height: 48px;
        padding: 0;
        font-size: 1.3rem;
        display: flex;
        align-items: center;
        justify-content: center;
        background: var(--primary);
        color: white;
        border: none;
        box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
        overflow: hidden;
        text-indent: 0;
    }

    /* Mobile Menu Settings Row */
    .mobile-menu-settings {
        display: flex;
        gap: 12px;
        padding: 20px;
        margin-top: auto;
        border-top: 1px solid var(--border);
        margin-bottom: 20px;
    }

    .mobile-setting-btn {
        flex: 1;
        display: flex;
        align-items: center;
        justify-content: center;
        gap: 6px;
        padding: 12px 16px;
        background: var(--opt-hover);
        border: 1px solid var(--border);
        color: var(--text-main);
        border-radius: 12px;
        cursor: pointer;
        font-size: 0.9rem;
        transition: all 0.2s ease;
    }

    .mobile-setting-btn:hover {
        background: var(--primary);
        color: white;
        border-color: var(--primary);
    }

    .question-card,
    .hero-card {
        border-radius: 0;
        /* Often better on very small screens, or small radius */
        padding: 24px 16px;
    }

    .option-btn {
        padding: 14px;
    }

    .opt-content {
        font-size: 0.95rem;
    }

    h1 {
        font-size: 1.25rem;
    }

    .logo-text {
        display: none;
        /* If text is too long */
    }

    .modal-content {
        width: 95%;
        max-height: 85vh;
        padding: 24px 16px;
    }

    /* Adjust font size for questions */
    #question-text {
        font-size: 1.1rem;
        line-height: 1.5;
    }
}


/* ==========================================
   UNLOCK BUTTON
   ========================================== */
.unlock-btn {
    margin-top: auto;
    /* Push to bottom */
    width: 100%;
    padding: 8px 12px;
    background: transparent;
    border: 1px solid var(--primary);
    color: var(--primary);
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.unlock-btn:hover {
    background: var(--primary);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.2);
}

/* Ensure card has flex column layout to push button down */
.unit-card {
    display: flex;

    /* Audio Summary Styles */

    /* 1. Semester Filter */
    .audio-semester-filter {
        display: flex;
        gap: 12px;
        overflow-x: auto;
        padding: 4px 4px 16px 4px;
        margin-bottom: 32px;
        scrollbar-width: thin;
        scrollbar-color: var(--primary) transparent;
    }

    .audio-semester-filter::-webkit-scrollbar {
        height: 6px;
    }

    .audio-semester-filter::-webkit-scrollbar-track {
        background: transparent;
    }

    .audio-semester-filter::-webkit-scrollbar-thumb {
        background-color: var(--primary);
        border-radius: 20px;
    }

    .audio-semester-pill {
        padding: 10px 20px;
        background: var(--surface);
        border: 1px solid var(--border);
        border-radius: 99px;
        color: var(--text-secondary);
        white-space: nowrap;
        cursor: pointer;
        font-weight: 500;
        font-size: 0.9rem;
        transition: all 0.2s;
    }

    .audio-semester-pill:hover {
        background: var(--surface-elevated);
        color: var(--text-main);
        border-color: var(--primary);
    }

    .audio-semester-pill.active {
        background: var(--primary);
        color: white;
        border-color: var(--primary);
        box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
    }

    /* 2. Audio Subjects List */
    .audio-subjects-container {
        display: flex;
        flex-direction: column;
        gap: 16px;
    }

    .audio-subject-card {
        background: var(--surface);
        border: 1px solid var(--border);
        border-radius: var(--radius);
        overflow: hidden;
        transition: all 0.3s ease;
    }

    .audio-subject-card:hover {
        border-color: var(--border-light);
        transform: translateY(-2px);
        box-shadow: var(--shadow);
    }

    .audio-subject-header {
        padding: 20px;
        cursor: pointer;
        display: flex;
        justify-content: space-between;
        align-items: center;
        background: var(--surface);
    }

    .audio-subject-header:hover {
        background: var(--surface-elevated);
    }

    .audio-subject-info h3 {
        font-size: 1.1rem;
        margin-bottom: 4px;
        color: var(--text-main);
    }

    .audio-subject-info p {
        font-size: 0.85rem;
        color: var(--text-secondary);
    }

    .audio-units-list {
        background: var(--background);
        border-top: 1px solid var(--border);
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s ease-out;
    }

    .audio-subject-card.expanded .audio-units-list {
        max-height: 1000px;
        /* Arbitrary large height */
        transition: max-height 0.5s ease-in;
    }

    .audio-unit-item {
        padding: 16px 20px;
        display: flex;
        justify-content: space-between;
        align-items: center;
        border-bottom: 1px solid var(--border);
        cursor: pointer;
        transition: all 0.2s;
    }

    .audio-unit-item:last-child {
        border-bottom: none;
    }

    .audio-unit-item:hover {
        background: var(--surface-elevated);
    }

    .audio-unit-item.active {
        background: rgba(59, 130, 246, 0.1);
        border-left: 4px solid var(--primary);
    }

    .audio-unit-title {
        display: flex;
        align-items: center;
        gap: 12px;
        font-size: 0.95rem;
        color: var(--text-main);
    }

    .audio-unit-meta {
        display: flex;
        align-items: center;
        gap: 12px;
    }

    .audio-duration {
        font-size: 0.8rem;
        color: var(--text-secondary);
        background: var(--surface);
        padding: 2px 8px;
        border-radius: 4px;
    }

    /* 3. Audio Player Bar */
    .audio-player-bar {
        position: fixed;
        bottom: 0;
        left: 0;
        width: 100%;
        background: rgba(15, 23, 42, 0.95);
        /* surface color with opacity */
        backdrop-filter: blur(12px);
        border-top: 1px solid var(--border);
        padding: 16px 20px;
        z-index: 1000;
        box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.3);
        transition: transform 0.3s ease;
    }

    .audio-player-bar.hidden {
        transform: translateY(100%);
    }

    .audio-player-content {
        max-width: 1200px;
        margin: 0 auto;
        display: grid;
        grid-template-columns: 1fr 2fr 1fr;
        /* Info | Controls | Progress */
        align-items: center;
        gap: 24px;
    }

    /* Player Info */
    .audio-track-info {
        display: flex;
        align-items: center;
        gap: 12px;
        min-width: 0;
        /* Text truncation fix */
    }

    .audio-icon-wrapper {
        width: 48px;
        height: 48px;
        background: var(--primary);
        border-radius: 8px;
        display: flex;
        align-items: center;
        justify-content: center;
        flex-shrink: 0;
    }

    .audio-type-icon {
        font-size: 1.5rem;
        color: white;
    }

    .audio-text-details {
        min-width: 0;
    }

    .audio-text-details h4 {
        font-size: 0.95rem;
        color: var(--text-main);
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
        margin-bottom: 2px;
    }

    .audio-text-details p {
        font-size: 0.8rem;
        color: var(--text-secondary);
    }

    /* Player Controls */
    .audio-controls {
        display: flex;
        justify-content: center;
        align-items: center;
        gap: 20px;
    }

    .audio-ctrl-btn {
        background: transparent;
        border: none;
        color: var(--text-secondary);
        cursor: pointer;
        font-size: 1.2rem;
        padding: 8px;
        border-radius: 50%;
        transition: all 0.2s;
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .audio-ctrl-btn:hover {
        color: var(--text-main);
        background: var(--opt-hover);
    }

    .audio-ctrl-btn:disabled {
        opacity: 0.3;
        cursor: not-allowed;
    }

    .audio-play-btn {
        width: 48px;
        height: 48px;
        border-radius: 50%;
        background: var(--primary);
        border: none;
        color: white;
        font-size: 1.2rem;
        display: flex;
        align-items: center;
        justify-content: center;
        cursor: pointer;
        transition: all 0.2s;
        box-shadow: 0 4px 12px rgba(59, 130, 246, 0.4);
    }

    .audio-play-btn:hover {
        transform: scale(1.05);
        background: var(--primary-dark);
    }

    .audio-play-btn:disabled {
        opacity: 0.5;
        cursor: wait;
        transform: none;
    }

    /* Progress Bar */
    .audio-progress-container {
        display: flex;
        align-items: center;
        gap: 12px;
        font-size: 0.8rem;
        color: var(--text-secondary);
        font-variant-numeric: tabular-nums;
    }

    .audio-progress-bar {
        flex: 1;
        height: 6px;
        background: var(--surface-elevated);
        border-radius: 99px;
        position: relative;
        cursor: pointer;
    }

    .audio-progress-fill {
        position: absolute;
        top: 0;
        left: 0;
        height: 100%;
        background: var(--primary);
        border-radius: 99px;
        width: 0%;
    }

    #audio-seek-slider {
        position: absolute;
        width: 100%;
        height: 100%;
        top: 0;
        left: 0;
        margin: 0;
        opacity: 0;
        cursor: pointer;
    }

    /* Mobile Responsiveness */
    @media (max-width: 768px) {
        .audio-player-bar {
            padding: 12px;
            bottom: 56px;
            /* Space for mobile nav */
        }

        .audio-player-content {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .audio-track-info {
            width: 100%;
            padding-right: 32px;
            /* Space for close button */
        }

        .audio-controls {
            width: 100%;
            justify-content: center;
            order: 2;
        }

        .audio-progress-container {
            width: 100%;
            order: 3;
        }

        .audio-close-btn {
            position: absolute;
            top: 12px;
            right: 12px;
            background: transparent;
            border: none;
            color: var(--text-secondary);
            font-size: 1.5rem;
            padding: 4px;
            line-height: 1;
        }
    }
}

/* Resumo Tabs */
.resumo-type-tabs {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-bottom: 32px;
}

.resumo-tab-btn {
    background: var(--surface);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    padding: 10px 24px;
    border-radius: 99px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 8px;
}

.resumo-tab-btn:hover {
    background: var(--surface-elevated);
    color: var(--text-main);
    transform: translateY(-2px);
}

.resumo-tab-btn.active {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

/* Fix for Vertical Semester Filter */
.audio-semester-filter {
    flex-wrap: nowrap !important;
    /* Ensure it stays in one line */
    overflow-x: auto;
    white-space: nowrap;
    justify-content: flex-start;
    /* Fix centering issue if items are few */
}

.audio-semester-pill {
    flex-shrink: 0;
    /* Prevent shrinking */
}

/* =========================================
   RESUMO UI REFACTOR (Spotify/Notion Style)
   ========================================= */

/* --- Layout & Header --- */
.resumo-header {
    background: rgba(13, 17, 23, 0.95);
    backdrop-filter: blur(12px);
    position: sticky;
    top: 60px;
    /* Adjust based on main nav height */
    z-index: 90;
    padding: 16px 24px;
    border-bottom: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin: -20px -20px 24px -20px;
    /* Negative margin to span full width of container */
}

.resumo-header-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}

.resumo-page-title {
    font-size: 1.5rem;
    margin: 0;
    display: flex;
    align-items: center;
    gap: 8px;
}

.resumo-toggle-container {
    background: var(--surface);
    padding: 4px;
    border-radius: 8px;
    display: flex;
    gap: 4px;
    border: 1px solid var(--border);
}

.resumo-toggle-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 6px 16px;
    border-radius: 6px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.resumo-toggle-btn.active {
    background: var(--surface-elevated);
    color: var(--text-main);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.resumo-filters-bar {
    display: flex;
    gap: 12px;
    overflow-x: auto;
    padding-bottom: 4px;
    /* for scrollbar */
}

.custom-select-wrapper select {
    background: var(--surface);
    color: var(--text-main);
    border: 1px solid var(--border);
    padding: 8px 16px;
    border-radius: 6px;
    font-size: 0.9rem;
    cursor: pointer;
    min-width: 150px;
}

/* --- Content Grid --- */
.resumo-content-container {
    padding-bottom: 120px;
    /* Space for fixed player */
}

.resumo-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
}

/* Subject Group (Notion Toggle Style) */
.resumo-subject-group {
    margin-bottom: 32px;
}

.resumo-subject-title {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 16px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 8px;
}

/* Card Style */
.resumo-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 16px;
    position: relative;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    display: flex;
    flex-direction: column;
    gap: 12px;
    overflow: hidden;
}

.resumo-card:hover {
    transform: translateY(-4px);
    background: var(--surface-elevated);
    border-color: var(--primary);
    box-shadow: 0 12px 24px -8px rgba(0, 0, 0, 0.3);
}

.resumo-card-header {
    display: flex;
    align-items: flex-start;
    gap: 12px;
}

.resumo-icon-box {
    width: 40px;
    height: 40px;
    background: rgba(59, 130, 246, 0.1);
    color: var(--primary);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    flex-shrink: 0;
}

.resumo-card-info h4 {
    margin: 0 0 4px 0;
    font-size: 1rem;
    line-height: 1.4;
}

.resumo-card-meta {
    font-size: 0.8rem;
    color: var(--text-secondary);
    display: flex;
    gap: 12px;
}

/* Premium Overlay */
.resumo-card.locked {
    opacity: 0.7;
}

.resumo-card.locked::after {
    content: "🔒 Premium";
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(0, 0, 0, 0.8);
    color: #FFD700;
    padding: 6px 12px;
    border-radius: 4px;
    font-weight: bold;
    opacity: 0;
    transition: opacity 0.2s;
    pointer-events: none;
}

.resumo-card.locked:hover::after {
    opacity: 1;
}

/* Play Button Reveal */
.resumo-play-overlay {
    position: absolute;
    right: 16px;
    bottom: 16px;
    width: 40px;
    height: 40px;
    background: var(--primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    opacity: 0;
    transform: scale(0.8);
    transition: all 0.2s;
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.4);
}

.resumo-card:hover .resumo-play-overlay {
    opacity: 1;
    transform: scale(1);
}

/* --- Fixed Player (Spotify Style) --- */
.audio-player-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    padding: 0 16px 16px 16px;
    /* Floating look */
    pointer-events: none;
    /* Allow click-through on sides */
}

.audio-player-glass {
    pointer-events: auto;
    background: rgba(20, 20, 25, 0.95);
    backdrop-filter: blur(16px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    padding: 12px 24px;
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 2fr 1fr;
    align-items: center;
    gap: 24px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
}

/* Track Info */
.audio-track-info {
    display: flex;
    align-items: center;
    gap: 16px;
}

.audio-cover-art {
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, #3b82f6, #8b5cf6);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
}

.audio-text-details h4 {
    margin: 0;
    font-size: 0.95rem;
    color: white;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 200px;
}

.audio-text-details p {
    margin: 4px 0 0 0;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

/* Center Controls */
.audio-controls-center {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.audio-buttons {
    display: flex;
    align-items: center;
    gap: 24px;
}

.audio-btn-play {
    width: 40px;
    height: 40px;
    background: white;
    color: black;
    border-radius: 50%;
    border: none;
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: transform 0.1s;
}

.audio-btn-play:hover {
    transform: scale(1.05);
}

.audio-btn-prev,
.audio-btn-next,
.audio-btn-sec {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 1.2rem;
    cursor: pointer;
}

.audio-btn-sec {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.audio-btn-prev:hover,
.audio-btn-next:hover {
    color: white;
}

/* Progress Bar */
.audio-progress-wrapper {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.audio-slider-container {
    flex: 1;
    height: 4px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 2px;
    position: relative;
    cursor: pointer;
}

.audio-progress-fill {
    height: 100%;
    background: white;
    border-radius: 2px;
    position: absolute;
    top: 0;
    left: 0;
}

.audio-slider-container:hover .audio-progress-fill {
    background: var(--primary);
}

#audio-seek-slider {
    position: absolute;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
    z-index: 2;
}

/* Right Controls */
.audio-controls-right {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 12px;
}

#audio-volume-slider {
    width: 80px;
    height: 4px;
    -webkit-appearance: none;
    appearance: none;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 2px;
    outline: none;
}

#audio-volume-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 10px;
    height: 10px;
    background: white;
    border-radius: 50%;
    cursor: pointer;
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
    .audio-player-glass {
        grid-template-columns: 1fr auto;
        padding: 12px;
        gap: 12px;
        align-items: center;
    }

    .audio-progress-wrapper,
    .audio-controls-right,
    .audio-btn-sec,
    .audio-subtitle {
        display: none;
    }

    .audio-text-details h4 {
        max-width: 140px;
        font-size: 0.9rem;
    }

    .audio-buttons {
        gap: 16px;
    }
}

/* --- Persistent Audio Player (Bottom-Right Mini Player) --- */
.audio-player-bar {
    position: fixed !important;
    bottom: 20px !important;
    right: 20px !important;
    left: auto !important;
    z-index: 9999 !important;
    width: 360px;
    max-width: calc(100vw - 40px);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5), 0 0 0 1px rgba(255, 255, 255, 0.08);
    transition: transform 0.3s ease, opacity 0.3s ease;
}

.audio-player-bar.hidden {
    display: none !important;
}

.audio-player-glass {
    background: rgba(15, 23, 42, 0.97);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    padding: 14px 18px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

/* Track Info Row */
.audio-track-info {
    display: flex;
    align-items: center;
    gap: 10px;
}

.audio-cover-art {
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, #6366f1, #8b5cf6);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    flex-shrink: 0;
}

.audio-text-details {
    flex: 1;
    min-width: 0;
}

.audio-text-details h4 {
    font-size: 0.85rem;
    font-weight: 600;
    color: #fff;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin: 0;
}

.audio-text-details p {
    font-size: 0.72rem;
    color: rgba(255, 255, 255, 0.5);
    margin: 2px 0 0 0;
}

/* Controls Row */
.audio-buttons {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.audio-btn-play {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: #10b981;
    color: white;
    border: none;
    font-size: 1rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.15s ease, background 0.2s;
}

.audio-btn-play:hover {
    transform: scale(1.1);
    background: #059669;
}

.audio-btn-play:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.audio-btn-sec,
.audio-btn-prev,
.audio-btn-next {
    background: none;
    border: none;
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.8rem;
    cursor: pointer;
    padding: 4px;
    transition: color 0.2s;
}

.audio-btn-sec:hover,
.audio-btn-prev:hover,
.audio-btn-next:hover {
    color: white;
}

/* Progress Bar */
.audio-progress-wrapper {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.7rem;
    color: rgba(255, 255, 255, 0.4);
}

.audio-slider-container {
    flex: 1;
    position: relative;
    height: 4px;
}

#audio-seek-slider {
    width: 100%;
    height: 4px;
    appearance: none;
    -webkit-appearance: none;
    background: rgba(255, 255, 255, 0.15);
    border-radius: 2px;
    outline: none;
    position: relative;
    z-index: 2;
}

#audio-seek-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 10px;
    height: 10px;
    background: #10b981;
    border-radius: 50%;
    cursor: pointer;
}

.audio-progress-fill {
    position: absolute;
    top: 0;
    left: 0;
    height: 4px;
    background: #10b981;
    border-radius: 2px;
    z-index: 1;
    pointer-events: none;
}

/* Controls Right (Speed, Volume, Close) */
.audio-controls-right {
    display: flex;
    align-items: center;
    gap: 8px;
    justify-content: flex-end;
}

.audio-speed-btn {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.15);
    color: #10b981;
    font-size: 0.72rem;
    font-weight: 700;
    padding: 2px 8px;
    border-radius: 6px;
    cursor: pointer;
    transition: background 0.2s;
}

.audio-speed-btn:hover {
    background: rgba(255, 255, 255, 0.2);
}

.audio-vol-icon {
    font-size: 0.8rem;
}

#audio-volume-slider {
    width: 60px;
    height: 4px;
    appearance: none;
    -webkit-appearance: none;
    background: rgba(255, 255, 255, 0.15);
    border-radius: 2px;
    outline: none;
}

#audio-volume-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 10px;
    height: 10px;
    background: white;
    border-radius: 50%;
    cursor: pointer;
}

.audio-close-btn {
    background: none;
    border: none;
    color: rgba(255, 255, 255, 0.4);
    font-size: 1.2rem;
    cursor: pointer;
    padding: 0 4px;
    transition: color 0.2s;
}

.audio-close-btn:hover {
    color: #ef4444;
}

/* Mobile: show close, hide some extras */
@media (max-width: 768px) {
    .audio-player-bar {
        width: calc(100vw - 20px);
        right: 10px !important;
        bottom: 10px !important;
    }

    .audio-btn-sec {
        display: none;
    }

    #audio-volume-slider,
    .audio-vol-icon {
        display: none;
    }

    .audio-close-btn {
        display: block !important;
    }
}

/* =========================================
   RESUMO READER — Inline Content Viewer
   ========================================= */

.resumo-reader {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 16px 60px;
}

.resumo-reader-header {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px 0;
    margin-bottom: 24px;
    border-bottom: 1px solid var(--border);
}

.resumo-reader-back {
    background: var(--surface);
    border: 1px solid var(--border);
    color: var(--text-main);
    padding: 8px 16px;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    white-space: nowrap;
}

.resumo-reader-back:hover {
    background: var(--surface-elevated);
    border-color: var(--primary);
    color: var(--primary);
}

.resumo-reader-header h3 {
    margin: 0;
    font-size: 1.2rem;
    color: var(--text-main);
}

.resumo-reader-content {
    line-height: 1.8;
    color: var(--text-main);
}

.resumo-reader-content h2 {
    font-size: 1.6rem;
    margin: 0 0 24px;
    color: var(--primary);
    border-bottom: 2px solid var(--primary);
    padding-bottom: 12px;
}

.resumo-reader-content h3 {
    font-size: 1.2rem;
    margin: 0 0 12px;
    color: var(--text-main);
}

.resumo-reader-content .resumo-section {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 20px;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.resumo-reader-content .resumo-section:hover {
    border-color: rgba(59, 130, 246, 0.3);
}

.resumo-reader-content ul {
    padding-left: 20px;
    margin: 8px 0;
}

.resumo-reader-content li {
    margin-bottom: 6px;
}

.resumo-reader-content p {
    margin: 8px 0;
}

/* Resumo Tables */
.resumo-table {
    width: 100%;
    border-collapse: collapse;
    margin: 12px 0;
    font-size: 0.9rem;
    min-width: 400px;
}

.resumo-table thead {
    background: rgba(59, 130, 246, 0.1);
}

.resumo-table th {
    padding: 10px 12px;
    text-align: left;
    font-weight: 600;
    color: var(--primary);
    border-bottom: 2px solid var(--border);
}

.resumo-table td {
    padding: 10px 12px;
    border-bottom: 1px solid var(--border);
    vertical-align: top;
}

.resumo-table tr:hover td {
    background: rgba(255, 255, 255, 0.02);
}

/* Resumo Tips */
.resumo-tip {
    background: rgba(16, 185, 129, 0.08);
    border-left: 4px solid #10b981;
    padding: 12px 16px;
    border-radius: 0 8px 8px 0;
    margin: 12px 0;
    font-size: 0.92rem;
    line-height: 1.6;
}

/* =========================================
   RESUMO SUBJECT TABS (Pills)
   ========================================= */

.resumo-subject-tabs {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border);
}

.resumo-subject-pill {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 18px;
    border-radius: 99px;
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    white-space: nowrap;
}

.resumo-subject-pill:hover {
    background: var(--surface-elevated);
    color: var(--text-main);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.resumo-subject-pill.active {
    background: var(--surface-elevated);
    color: var(--text-main);
    border-color: var(--pill-color, var(--primary));
    box-shadow: 0 0 0 1px var(--pill-color, var(--primary)), 0 4px 12px rgba(0, 0, 0, 0.15);
}

.pill-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    flex-shrink: 0;
}

/* Subject Header (below tabs) */
.resumo-subject-header {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 20px;
    padding: 16px;
    background: var(--surface);
    border-radius: 12px;
    border: 1px solid var(--border);
}

.resumo-subject-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    flex-shrink: 0;
}

.resumo-subject-header h3 {
    margin: 0 0 2px;
    font-size: 1.15rem;
    color: var(--text-main);
}

.resumo-subject-count {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.resumo-cards-area {
    animation: fadeSlideIn 0.3s ease;
}

@keyframes fadeSlideIn {
    from {
        opacity: 0;
        transform: translateY(8px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Empty State */
.resumo-empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-secondary);
}

/* Mobile Responsive Reader */
@media (max-width: 768px) {

    /* Reader as fixed full-screen overlay */
    #resumo-reader-screen {
        position: fixed !important;
        top: 0;
        left: 0;
        width: 100vw;
        height: 100vh;
        z-index: 9999;
        background: var(--bg, #0d1117);
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
    }

    .resumo-reader {
        padding: 12px 12px 80px;
        max-width: 100%;
        overflow-x: hidden;
    }

    .resumo-reader-header {
        gap: 10px;
        padding: 12px 0;
        margin-bottom: 16px;
    }

    .resumo-reader-back {
        padding: 8px 12px;
        font-size: 0.85rem;
    }

    .resumo-reader-header h3 {
        font-size: 0.95rem;
        word-break: break-word;
    }

    .resumo-reader-content {
        line-height: 1.7;
        font-size: 0.95rem;
    }

    .resumo-reader-content h2 {
        font-size: 1.3rem;
    }

    .resumo-reader-content .resumo-section {
        padding: 14px;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }

    .resumo-table {
        font-size: 0.78rem;
        min-width: 360px;
    }

    .resumo-table th,
    .resumo-table td {
        padding: 6px 8px;
    }

    /* Subject tabs on mobile */
    .resumo-subject-tabs {
        gap: 6px;
        overflow-x: auto;
        flex-wrap: nowrap;
        padding-bottom: 12px;
        -webkit-overflow-scrolling: touch;
    }

    .resumo-subject-pill {
        padding: 8px 14px;
        font-size: 0.82rem;
    }

    .resumo-subject-header {
        padding: 12px;
    }

    .resumo-subject-icon {
        width: 40px;
        height: 40px;
        font-size: 1.2rem;
    }
}

/* ============================================
   PENGUIN ANIMATION (Duolingo-style)
   ============================================ */

.penguin-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.55);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    z-index: 10005;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    opacity: 0;
    animation: penguinOverlayIn 0.35s ease forwards;
    pointer-events: all;
    cursor: pointer;
}

.penguin-overlay.dismissing {
    animation: penguinOverlayOut 0.5s ease forwards;
}

@keyframes penguinOverlayIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes penguinOverlayOut {
    from { opacity: 1; }
    to { opacity: 0; }
}

/* Penguin Image */
.penguin-character {
    width: 140px;
    height: 140px;
    object-fit: contain;
    filter: drop-shadow(0 8px 24px rgba(0,0,0,0.4));
    animation: penguinBounceIn 0.6s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
    transform: translateY(100vh);
}

@keyframes penguinBounceIn {
    0%   { transform: translateY(100vh) scale(0.5); opacity: 0; }
    50%  { transform: translateY(-20px) scale(1.1); opacity: 1; }
    70%  { transform: translateY(10px) scale(0.95); }
    85%  { transform: translateY(-5px) scale(1.02); }
    100% { transform: translateY(0) scale(1); opacity: 1; }
}

.penguin-overlay.dismissing .penguin-character {
    animation: penguinBounceOut 0.45s ease forwards;
}

@keyframes penguinBounceOut {
    0%   { transform: translateY(0) scale(1); opacity: 1; }
    100% { transform: translateY(100vh) scale(0.5); opacity: 0; }
}

/* Wiggle after bounce */
.penguin-character.wiggle {
    animation: penguinWiggle 0.5s ease, penguinBreathing 1.5s ease-in-out 0.5s infinite;
}

@keyframes penguinWiggle {
    0%   { transform: rotate(0deg); }
    20%  { transform: rotate(-12deg); }
    40%  { transform: rotate(10deg); }
    60%  { transform: rotate(-8deg); }
    80%  { transform: rotate(5deg); }
    100% { transform: rotate(0deg); }
}

/* Continuous breathing/idle animation — feels like a GIF */
@keyframes penguinBreathing {
    0%   { transform: scale(1) translateY(0); }
    50%  { transform: scale(1.04) translateY(-4px); }
    100% { transform: scale(1) translateY(0); }
}

/* Speech Bubble */
.penguin-speech {
    margin-top: 16px;
    background: var(--surface, #1e293b);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 20px;
    padding: 18px 28px;
    max-width: 340px;
    text-align: center;
    position: relative;
    opacity: 0;
    transform: scale(0.8) translateY(10px);
    animation: speechBubbleIn 0.4s 0.35s ease forwards;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

/* Triangle pointer */
.penguin-speech::before {
    content: '';
    position: absolute;
    top: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 0;
    border-left: 10px solid transparent;
    border-right: 10px solid transparent;
    border-bottom: 10px solid var(--surface, #1e293b);
}

@keyframes speechBubbleIn {
    from { opacity: 0; transform: scale(0.8) translateY(10px); }
    to   { opacity: 1; transform: scale(1) translateY(0); }
}

.penguin-overlay.dismissing .penguin-speech {
    animation: speechBubbleOut 0.3s ease forwards;
}

@keyframes speechBubbleOut {
    from { opacity: 1; transform: scale(1); }
    to   { opacity: 0; transform: scale(0.8) translateY(10px); }
}

.penguin-speech p {
    color: var(--text-main, #f8fafc);
    font-size: 1rem;
    line-height: 1.5;
    margin: 0 0 14px 0;
    font-weight: 500;
}

.penguin-resumo-btn {
    background: var(--gradient-primary, linear-gradient(135deg, #3b82f6, #2563eb));
    color: #fff;
    border: none;
    border-radius: 12px;
    padding: 10px 22px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: 'Inter', sans-serif;
}

.penguin-resumo-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 16px rgba(59, 130, 246, 0.4);
}

/* Progress dots at the bottom - showing it's disappearing */
.penguin-timer-bar {
    position: absolute;
    bottom: 0;
    left: 0;
    height: 3px;
    background: var(--primary, #3b82f6);
    border-radius: 0 0 20px 20px;
    animation: timerShrink 4s linear forwards;
    animation-delay: 0.3s;
}

@keyframes timerShrink {
    from { width: 100%; }
    to   { width: 0%; }
}

@media (max-width: 768px) {
    .penguin-character {
        width: 110px;
        height: 110px;
    }

    .penguin-speech {
        max-width: 280px;
        padding: 14px 20px;
        margin-left: 16px;
        margin-right: 16px;
    }

    .penguin-speech p {
        font-size: 0.9rem;
    }
}

/* --- Fix for Penguin Logo in Dark Mode --- */
:root {
    --penguin-body: #38bdf8; /* bright sky blue in dark mode */
}
body.light-mode {
    --penguin-body: #1e293b; /* original dark slate in light mode */
}
.cute-penguin path[fill="#1e293b"],
svg.cute-penguin path[fill="#1e293b"] {
    fill: var(--penguin-body) !important;
    transition: fill 0.3s ease;
}

/* =========================================
   INTERACTIVE RESUMO COMPONENTS
   ========================================= */

/* --- Staggered Entrance Animation for Sections --- */
.resumo-reader-content .resumo-section {
    opacity: 0;
    transform: translateY(20px);
    animation: resumoSectionIn 0.5s ease forwards;
}
.resumo-reader-content .resumo-section:nth-child(1) { animation-delay: 0.05s; }
.resumo-reader-content .resumo-section:nth-child(2) { animation-delay: 0.15s; }
.resumo-reader-content .resumo-section:nth-child(3) { animation-delay: 0.25s; }
.resumo-reader-content .resumo-section:nth-child(4) { animation-delay: 0.35s; }
.resumo-reader-content .resumo-section:nth-child(5) { animation-delay: 0.45s; }
.resumo-reader-content .resumo-section:nth-child(6) { animation-delay: 0.55s; }
.resumo-reader-content .resumo-section:nth-child(7) { animation-delay: 0.65s; }
.resumo-reader-content .resumo-section:nth-child(8) { animation-delay: 0.75s; }

@keyframes resumoSectionIn {
    from { opacity: 0; transform: translateY(20px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* --- Accordion (Collapsible Sections) --- */
.resumo-accordion {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    margin-bottom: 12px;
    overflow: hidden;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}
.resumo-accordion:hover {
    border-color: rgba(59, 130, 246, 0.3);
}
.resumo-accordion.open {
    border-color: rgba(59, 130, 246, 0.4);
    box-shadow: 0 0 20px rgba(59, 130, 246, 0.08);
}
.resumo-accordion-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    cursor: pointer;
    user-select: none;
    transition: background 0.2s ease;
    gap: 12px;
}
.resumo-accordion-header:hover {
    background: rgba(255, 255, 255, 0.03);
}
.resumo-accordion-header h4 {
    margin: 0;
    font-size: 1.05rem;
    color: var(--text-main);
    display: flex;
    align-items: center;
    gap: 10px;
}
.resumo-accordion-arrow {
    font-size: 0.9rem;
    color: var(--text-secondary);
    transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    flex-shrink: 0;
}
.resumo-accordion.open .resumo-accordion-arrow {
    transform: rotate(180deg);
}
.resumo-accordion-body {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1), padding 0.3s ease;
    padding: 0 20px;
}
.resumo-accordion.open .resumo-accordion-body {
    max-height: 2000px;
    padding: 0 20px 20px;
}

/* --- Flip Card (Click-to-Reveal) --- */
.resumo-flip-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 16px;
    margin: 16px 0;
}
.resumo-flip-card {
    perspective: 800px;
    height: 180px;
    cursor: pointer;
}
.resumo-flip-inner {
    position: relative;
    width: 100%;
    height: 100%;
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    transform-style: preserve-3d;
}
.resumo-flip-card.flipped .resumo-flip-inner {
    transform: rotateX(180deg);
}
.resumo-flip-front,
.resumo-flip-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    border-radius: 12px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 20px;
    text-align: center;
    box-sizing: border-box;
}
.resumo-flip-front {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.12), rgba(139, 92, 246, 0.08));
    border: 1px solid rgba(59, 130, 246, 0.2);
    color: var(--text-main);
}
.resumo-flip-front .flip-icon {
    font-size: 2rem;
    margin-bottom: 10px;
}
.resumo-flip-front .flip-label {
    font-weight: 700;
    font-size: 1rem;
    margin-bottom: 6px;
}
.resumo-flip-front .flip-hint {
    font-size: 0.75rem;
    color: var(--text-secondary);
    opacity: 0.7;
}
.resumo-flip-back {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.12), rgba(6, 182, 212, 0.08));
    border: 1px solid rgba(16, 185, 129, 0.25);
    color: var(--text-main);
    transform: rotateX(180deg);
    font-size: 0.9rem;
    line-height: 1.6;
    overflow-y: auto;
}

/* --- Mnemonic / Highlight Box --- */
.resumo-mnemonic {
    background: linear-gradient(135deg, rgba(251, 191, 36, 0.1), rgba(245, 158, 11, 0.06));
    border: 1px solid rgba(251, 191, 36, 0.25);
    border-radius: 12px;
    padding: 16px 20px;
    margin: 16px 0;
    position: relative;
    overflow: hidden;
}
.resumo-mnemonic::before {
    content: '🐧';
    position: absolute;
    top: -10px;
    right: -10px;
    font-size: 4rem;
    opacity: 0.08;
}
.resumo-mnemonic-title {
    font-weight: 700;
    color: #fbbf24;
    margin-bottom: 8px;
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    gap: 8px;
}
.resumo-mnemonic p {
    margin: 4px 0;
    font-size: 0.92rem;
    line-height: 1.6;
}

/* --- Danger / Warning Box --- */
.resumo-danger {
    background: linear-gradient(135deg, rgba(239, 68, 68, 0.1), rgba(220, 38, 38, 0.06));
    border: 1px solid rgba(239, 68, 68, 0.25);
    border-left: 4px solid #ef4444;
    border-radius: 0 12px 12px 0;
    padding: 14px 18px;
    margin: 14px 0;
}
.resumo-danger-title {
    font-weight: 700;
    color: #f87171;
    margin-bottom: 6px;
    font-size: 0.95rem;
}

/* --- Quiz Inline (Click to reveal answer) --- */
.resumo-quiz {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 20px;
    margin: 16px 0;
    transition: border-color 0.3s;
}
.resumo-quiz:hover {
    border-color: rgba(139, 92, 246, 0.3);
}
.resumo-quiz-question {
    font-weight: 600;
    color: var(--text-main);
    margin-bottom: 12px;
    font-size: 1rem;
    display: flex;
    align-items: flex-start;
    gap: 10px;
}
.resumo-quiz-question .quiz-q-icon {
    color: #8b5cf6;
    font-size: 1.2rem;
    flex-shrink: 0;
}
.resumo-quiz-answer {
    background: rgba(16, 185, 129, 0.08);
    border: 1px dashed rgba(16, 185, 129, 0.3);
    border-radius: 8px;
    padding: 14px 16px;
    cursor: pointer;
    user-select: none;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}
.resumo-quiz-answer:not(.revealed) {
    filter: blur(5px);
}
.resumo-quiz-answer:not(.revealed):hover {
    filter: blur(3px);
    border-color: rgba(16, 185, 129, 0.5);
}
.resumo-quiz-answer:not(.revealed)::after {
    content: '👆 Clique para revelar';
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.3);
    color: #fff;
    font-weight: 600;
    font-size: 0.9rem;
    filter: none;
    backdrop-filter: blur(2px);
    border-radius: 8px;
}
.resumo-quiz-answer.revealed {
    filter: none;
    border-style: solid;
    border-color: rgba(16, 185, 129, 0.4);
    animation: quizReveal 0.4s ease;
}
@keyframes quizReveal {
    0% { transform: scale(0.97); opacity: 0.5; }
    50% { transform: scale(1.01); }
    100% { transform: scale(1); opacity: 1; }
}

/* --- Comparison Card (Side-by-Side) --- */
.resumo-compare {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin: 16px 0;
}
.resumo-compare-item {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 16px;
    transition: transform 0.2s, border-color 0.3s;
}
.resumo-compare-item:hover {
    transform: translateY(-2px);
    border-color: var(--compare-color, var(--primary));
}
.resumo-compare-item h5 {
    margin: 0 0 10px;
    color: var(--compare-color, var(--primary));
    font-size: 1rem;
    display: flex;
    align-items: center;
    gap: 8px;
}
.resumo-compare-item ul {
    margin: 0;
    padding-left: 18px;
}
.resumo-compare-item li {
    margin-bottom: 4px;
    font-size: 0.88rem;
}

/* --- Animated Counter / Stat Badge --- */
.resumo-stats {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin: 16px 0;
}
.resumo-stat {
    flex: 1;
    min-width: 120px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 16px;
    text-align: center;
    transition: transform 0.2s, border-color 0.3s;
}
.resumo-stat:hover {
    transform: translateY(-3px);
    border-color: rgba(59, 130, 246, 0.3);
}
.resumo-stat-value {
    font-size: 1.8rem;
    font-weight: 800;
    background: linear-gradient(135deg, #3b82f6, #8b5cf6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.resumo-stat-label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-top: 4px;
}

/* --- Timeline (Steps/Process) --- */
.resumo-timeline {
    position: relative;
    margin: 16px 0;
    padding-left: 30px;
}
.resumo-timeline::before {
    content: '';
    position: absolute;
    left: 12px;
    top: 8px;
    bottom: 8px;
    width: 2px;
    background: linear-gradient(to bottom, #3b82f6, #8b5cf6, #ec4899);
    border-radius: 2px;
}
.resumo-timeline-item {
    position: relative;
    padding: 12px 0 12px 20px;
    opacity: 0;
    animation: timelineIn 0.4s ease forwards;
}
.resumo-timeline-item:nth-child(1) { animation-delay: 0.1s; }
.resumo-timeline-item:nth-child(2) { animation-delay: 0.2s; }
.resumo-timeline-item:nth-child(3) { animation-delay: 0.3s; }
.resumo-timeline-item:nth-child(4) { animation-delay: 0.4s; }
.resumo-timeline-item:nth-child(5) { animation-delay: 0.5s; }
.resumo-timeline-item:nth-child(6) { animation-delay: 0.6s; }
.resumo-timeline-item:nth-child(7) { animation-delay: 0.7s; }
.resumo-timeline-item:nth-child(8) { animation-delay: 0.8s; }

@keyframes timelineIn {
    from { opacity: 0; transform: translateX(-10px); }
    to   { opacity: 1; transform: translateX(0); }
}
.resumo-timeline-item::before {
    content: '';
    position: absolute;
    left: -24px;
    top: 18px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: #3b82f6;
    border: 2px solid var(--bg, #0d1117);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.3);
}
.resumo-timeline-item:last-child::before {
    background: #10b981;
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.3);
}
.resumo-timeline-item strong {
    color: var(--primary);
}

/* --- Pulse Glow for Important Elements --- */
.resumo-glow {
    animation: glowPulse 2s ease-in-out infinite;
}
@keyframes glowPulse {
    0%, 100% { box-shadow: 0 0 5px rgba(59, 130, 246, 0.1); }
    50%      { box-shadow: 0 0 20px rgba(59, 130, 246, 0.25), 0 0 40px rgba(59, 130, 246, 0.1); }
}

/* --- Table Row Highlight Animation --- */
.resumo-table tbody tr {
    transition: transform 0.2s ease, background 0.2s ease;
}
.resumo-table tbody tr:hover {
    transform: scale(1.01);
}
.resumo-table tbody tr:hover td {
    background: rgba(59, 130, 246, 0.06);
}

/* --- Emoji Badge --- */
.resumo-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 12px;
    border-radius: 99px;
    font-size: 0.78rem;
    font-weight: 600;
    border: 1px solid;
}
.resumo-badge.green  { background: rgba(16,185,129,0.1); border-color: rgba(16,185,129,0.25); color: #10b981; }
.resumo-badge.blue   { background: rgba(59,130,246,0.1); border-color: rgba(59,130,246,0.25); color: #3b82f6; }
.resumo-badge.purple { background: rgba(139,92,246,0.1); border-color: rgba(139,92,246,0.25); color: #8b5cf6; }
.resumo-badge.red    { background: rgba(239,68,68,0.1);  border-color: rgba(239,68,68,0.25);  color: #ef4444; }
.resumo-badge.yellow { background: rgba(251,191,36,0.1); border-color: rgba(251,191,36,0.25); color: #fbbf24; }

/* --- Mobile Responsive for Interactive Components --- */
@media (max-width: 768px) {
    .resumo-flip-grid {
        grid-template-columns: 1fr;
    }
    .resumo-flip-card {
        height: 160px;
    }
    .resumo-compare {
        grid-template-columns: 1fr;
    }
    .resumo-stats {
        flex-direction: column;
    }
    .resumo-stat {
        min-width: auto;
    }
    .resumo-accordion-header {
        padding: 14px 16px;
    }
    .resumo-accordion-body {
        padding: 0 16px;
    }
    .resumo-accordion.open .resumo-accordion-body {
        padding: 0 16px 16px;
    }
}

/* --- Lazer Screen Layout --- */
.lazer-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-template-rows: auto auto;
}

.lazer-card-featured {
    grid-row: span 2;
}

@media (max-width: 900px) {
    .lazer-grid {
        grid-template-columns: 1fr;
        grid-template-rows: auto;
    }
    
    .lazer-card-featured {
        grid-row: auto;
    }
}

/* Dashboard Screen Layout */
@media (max-width: 900px) {
    .dashboard-grid {
        grid-template-columns: 1fr !important;
    }
}