:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #64748b;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --background: #ffffff;
    --surface: #f8fafc;
    --card-background: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --shadow: rgba(0, 0, 0, 0.1);
    --border-radius: 12px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
    --primary-color: #3b82f6;
    --primary-hover: #2563eb;
    --background: #0f172a;
    --surface: #1e293b;
    --card-background: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --border-color: #475569;
    --shadow: rgba(0, 0, 0, 0.3);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--background);
    color: var(--text-primary);
    line-height: 1.6;
    transition: var(--transition);
    overflow-x: hidden;
}

#app {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
.header {
    background: var(--card-background);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-link {
    display: inline-block;
    text-decoration: none;
    transition: transform 0.2s ease;
}

.logo-link:hover {
    transform: scale(1.05);
}

.app-logo {
    height: 40px;
    width: auto;
    display: block;
}

/* Theme-based logo visibility */
.light-logo {
    display: block;
}

.dark-logo {
    display: none;
}

[data-theme="dark"] .light-logo {
    display: none;
}

[data-theme="dark"] .dark-logo {
    display: block;
}

.header-controls {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.quality-controls {
    display: flex;
    gap: 0.5rem;
}

.header-buttons {
    display: flex;
    gap: 0.5rem;
}

/* Desktop layout - single row */
@media (min-width: 641px) {
    .header-left-buttons,
    .header-right-buttons {
        display: flex;
        gap: 0.5rem;
        align-items: center;
    }

    .header-left-buttons {
        gap: 1rem; /* More space between upgrade and logout on desktop */
    }
}

/* Extra spacing before logout button */
.logout-btn {
    margin-left: 0.75rem;
}

.quality-header-btn {
    background: var(--surface);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    padding: 0.5rem;
    cursor: pointer;
    transition: var(--transition);
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    font-size: 1rem;
}

.quality-header-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 8px var(--shadow);
}

.quality-header-btn.up {
    color: var(--success-color);
}

.quality-header-btn.up:hover,
.quality-header-btn.up.active {
    background: var(--success-color);
    color: white;
    border-color: var(--success-color);
}

.quality-header-btn.down {
    color: var(--danger-color);
}

.quality-header-btn.down:hover,
.quality-header-btn.down.active {
    background: var(--danger-color);
    color: white;
    border-color: var(--danger-color);
}

.answer-toggle-header-btn {
    background: var(--surface);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    padding: 0.5rem;
    cursor: pointer;
    transition: var(--transition);
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    font-size: 1rem;
}

.answer-toggle-header-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 8px var(--shadow);
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

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

.icon-btn {
    background: var(--surface);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 0.5rem;
    cursor: pointer;
    transition: var(--transition);
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
}

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

/* Mobile header layout for narrow screens */
@media (max-width: 640px) {
    .header-content {
        display: grid;
        grid-template-columns: 1fr 1fr;
        grid-template-rows: auto auto;
        align-items: center;
        gap: 0.5rem;
        padding: 0.5rem;
    }

    /* Row 1: Logo (top-left) | Quality controls (top-right) */
    .logo-link {
        grid-column: 1;
        grid-row: 1;
        justify-self: start;
    }

    .quality-controls {
        grid-column: 2;
        grid-row: 1;
        justify-self: end;
        display: flex;
        gap: 0.3rem;
    }

    /* Row 2: Upgrade + Logout (bottom-left) | Theme + Stats + List (bottom-right) */
    .header-controls {
        grid-column: 1 / span 2;
        grid-row: 2;
        display: flex;
        justify-content: space-between;
        width: 100%;
    }

    .header-buttons {
        display: contents; /* Remove flex container, place buttons directly in grid */
    }

    /* Left side of row 2: upgrade and logout */
    .header-left-buttons {
        display: flex;
        gap: 0.3rem;
        align-items: center;
    }

    /* Right side of row 2: theme, stats, list */
    .header-right-buttons {
        display: flex;
        gap: 0.3rem;
        align-items: center;
    }

    #upgrade-btn,
    #logout-btn {
        order: 0;
    }

    #theme-toggle,
    #progress-btn,
    #cases-list-btn {
        order: 1;
    }
}

/* Main Content */
.main-content {
    flex: 1;
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem 1rem;
    /* Reserve space for fixed bottom navigation so content isn't overlapped */
    padding-bottom: 8rem;
    width: 100%;
}


/* Card Counter */
.card-counter {
    text-align: center;
    margin-bottom: 2rem;
    font-size: 1.125rem;
    font-weight: 500;
    color: var(--text-secondary);
}

#current-card {
    color: var(--primary-color);
    font-weight: 700;
    font-size: 1.25rem;
}

/* Flashcard */
.flashcard-container {
    perspective: 1000px;
    margin-bottom: 12rem;
}

.flashcard {
    position: relative;
    width: 100%;
    min-height: calc(100vh + 10rem);
    transform-style: preserve-3d;
    transition: transform 0.6s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    cursor: pointer;
    margin-bottom: 1rem;
}

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

.card-front,
.card-back {
    position: absolute;
    width: 100%;
    min-height: 500px;
    background: var(--card-background);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 2rem;
    backface-visibility: hidden;
    box-shadow: 0 4px 6px -1px var(--shadow);
    display: flex;
    flex-direction: column;
}

.card-back {
    transform: rotateY(180deg);
}

.card-header {
    margin-bottom: 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 1rem;
}

.card-header h2 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.4;
    flex: 1;
}

.rating-indicator {
    display: flex;
    gap: 0.25rem;
    flex-shrink: 0;
}

.rating-indicator .star {
    color: var(--warning-color);
    font-size: 0.875rem;
}

.card-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.context-section,
.question-section,
.answer-section {
    padding: 1.5rem;
    background: var(--surface);
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.context-section h3,
.question-section h3,
.answer-section h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.context-section p,
.question-section p {
    font-size: 1rem;
    line-height: 1.7;
    color: var(--text-primary);
}

#case-answer {
    font-size: 0.95rem;
    line-height: 1.7;
    color: var(--text-primary);
}

/* Markdown Styling */
.md-h2 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-color);
    margin: 1.5rem 0 0.75rem 0;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 0.5rem;
}

.md-h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 1.25rem 0 0.5rem 0;
}

.md-h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin: 1rem 0 0.5rem 0;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-size: 0.875rem;
}

.md-bold {
    font-weight: 600;
    color: var(--text-primary);
}

.md-italic {
    font-style: italic;
    color: var(--text-secondary);
}

.md-paragraph {
    margin: 0 0 1rem 0;
    line-height: 1.7;
}

.md-list {
    margin: 0.75rem 0;
    padding-left: 1.5rem;
    list-style: none;
}

.md-ordered-list {
    margin: 0.75rem 0;
    padding-left: 1.5rem;
    counter-reset: md-counter;
}

.md-bullet {
    position: relative;
    margin: 0.5rem 0;
    line-height: 1.6;
}

.md-bullet:before {
    content: '•';
    color: var(--primary-color);
    font-weight: bold;
    position: absolute;
    left: -1rem;
}

.md-number {
    position: relative;
    margin: 0.5rem 0;
    line-height: 1.6;
    counter-increment: md-counter;
}

.md-number:before {
    content: counter(md-counter) '.';
    color: var(--primary-color);
    font-weight: 600;
    position: absolute;
    left: -1.5rem;
    width: 1.25rem;
    text-align: right;
}

.flip-btn {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 0.875rem 1.5rem;
    border-radius: 8px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    margin-top: 1.5rem;
    font-size: 1rem;
}

.flip-btn:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
}

.flip-btn i {
    transition: transform 0.3s ease;
}

.flip-btn:hover i {
    transform: rotate(180deg);
}

/* Rating Section */
.rating-section {
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.self-assessment,
.quality-assessment {
    text-align: center;
}

.self-assessment h4,
.quality-assessment h4 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.rating-buttons,
.quality-buttons {
    display: flex;
    gap: 0.75rem;
    justify-content: center;
    flex-wrap: wrap;
}

.rating-btn,
.quality-btn {
    background: var(--surface);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    padding: 0.75rem 1rem;
    cursor: pointer;
    transition: var(--transition);
    font-weight: 500;
    font-size: 0.875rem;
    display: flex;
    align-items: center;
    gap: 0.375rem;
    min-width: 80px;
    justify-content: center;
}

.rating-btn:hover,
.quality-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 8px var(--shadow);
}

.rating-btn.poor {
    color: var(--danger-color);
}

.rating-btn.poor:hover,
.rating-btn.poor.active {
    background: var(--danger-color);
    color: white;
    border-color: var(--danger-color);
}

.rating-btn.okay {
    color: var(--warning-color);
}

.rating-btn.okay:hover,
.rating-btn.okay.active {
    background: var(--warning-color);
    color: white;
    border-color: var(--warning-color);
}

.rating-btn.perfect {
    color: var(--success-color);
}

.rating-btn.perfect:hover,
.rating-btn.perfect.active {
    background: var(--success-color);
    color: white;
    border-color: var(--success-color);
}

.quality-btn.up {
    color: var(--success-color);
}

.quality-btn.up:hover,
.quality-btn.up.active {
    background: var(--success-color);
    color: white;
    border-color: var(--success-color);
}

.quality-btn.down {
    color: var(--danger-color);
}

.quality-btn.down:hover,
.quality-btn.down.active {
    background: var(--danger-color);
    color: white;
    border-color: var(--danger-color);
}

/* Navigation */
.navigation {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin: 1rem 0 2rem 0;
    position: fixed;
    bottom: 1rem;
    left: 50%;
    transform: translateX(-50%);
    z-index: 50;
    background: var(--card-background);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 1rem;
    box-shadow: 0 4px 6px -1px var(--shadow);
    width: fit-content;
}

.nav-btn {
    background: var(--card-background);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 0.875rem 1.5rem;
    cursor: pointer;
    transition: var(--transition);
    font-weight: 500;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    min-width: 120px;
    justify-content: center;
}

.nav-btn:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
    transform: translateY(-1px);
}

.nav-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

/* Control Panel */
.control-panel {
    display: flex;
    justify-content: center;
}

.control-group {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.control-btn {
    background: var(--surface);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 0.75rem 1rem;
    cursor: pointer;
    transition: var(--transition);
    font-weight: 500;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
}

.control-btn:hover,
.control-btn.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

/* Modals */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    backdrop-filter: blur(4px);
}

.modal.show {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}

.modal-content {
    background: var(--card-background);
    border-radius: var(--border-radius);
    width: 100%;
    max-width: 600px;
    max-height: 80vh;
    overflow: hidden;
    box-shadow: 0 20px 25px -5px var(--shadow);
    display: flex;
    flex-direction: column;
}

.modal-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--surface);
}

.modal-header h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.close-btn {
    background: none;
    border: none;
    font-size: 1.25rem;
    cursor: pointer;
    color: var(--text-secondary);
    padding: 0.25rem;
    border-radius: 4px;
    transition: var(--transition);
}

.close-btn:hover {
    background: var(--border-color);
    color: var(--text-primary);
}

/* Search Inputs (shared) */
.search-container {
    padding: 1.5rem;
}

#search-input,
#cases-search-input {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    background: var(--surface);
    color: var(--text-primary);
    margin-bottom: 1rem;
}

#search-input:focus,
#cases-search-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.search-results {
    max-height: 300px;
    overflow-y: auto;
}

.search-result {
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    margin-bottom: 0.5rem;
    cursor: pointer;
    transition: var(--transition);
    background: var(--surface);
}

.search-result:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.search-result h4 {
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.search-result p {
    font-size: 0.75rem;
    opacity: 0.8;
}

/* Progress Modal */
.progress-content {
    padding: 1.5rem;
    overflow-y: auto;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: var(--surface);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.5rem;
    text-align: center;
}

.stat-number {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.25rem;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.rating-breakdown h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.breakdown-bars {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.breakdown-item {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.breakdown-label {
    width: 60px;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.breakdown-bar {
    flex: 1;
    height: 8px;
    background: var(--border-color);
    border-radius: 4px;
    overflow: hidden;
}

.breakdown-fill {
    height: 100%;
    transition: width 0.3s ease;
}

.breakdown-fill.perfect {
    background: var(--success-color);
}

.breakdown-fill.okay {
    background: var(--warning-color);
}

.breakdown-fill.poor {
    background: var(--danger-color);
}

.breakdown-count {
    width: 30px;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    text-align: right;
}

/* Cases Modal */
.cases-filters {
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
    background: var(--surface);
}

#cases-filter {
    width: 100%;
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--card-background);
    color: var(--text-primary);
    font-size: 0.875rem;
}

.cases-list {
    padding: 1rem;
    max-height: 400px;
    overflow-y: auto;
}

.case-item {
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    margin-bottom: 0.5rem;
    cursor: pointer;
    transition: var(--transition);
    background: var(--surface);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

.case-item:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.case-info {
    flex: 1;
}

.case-info h4 {
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.case-info p {
    font-size: 0.75rem;
    opacity: 0.8;
}

.case-indicators {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    align-items: flex-end;
}

.case-rating {
    display: flex;
    gap: 0.25rem;
}

.case-rating .star {
    color: var(--warning-color);
    font-size: 0.75rem;
}

.quality-emoji {
    font-size: 1.25rem;
    line-height: 1;
}

/* Loading */
.loading {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--background);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 2000;
}

.loading.hidden {
    display: none;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--border-color);
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 1rem;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

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

/* Keyboard Help */
.keyboard-help {
    position: fixed;
    bottom: 1rem;
    right: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    opacity: 0.7;
    transition: opacity 0.3s ease;
}

.keyboard-help:hover {
    opacity: 1;
}

.help-item {
    background: var(--card-background);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 0.5rem 0.75rem;
    font-size: 0.75rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

kbd {
    background: var(--surface);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 0.125rem 0.375rem;
    font-size: 0.625rem;
    font-weight: 500;
    color: var(--text-primary);
    box-shadow: 0 1px 0 var(--border-color);
}

.mobile-only {
    display: none;
}

.swipe-icon {
    font-size: 0.875rem;
    margin-right: 0.25rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .main-content {
        padding: 1rem;
    }
    
    .card-front,
    .card-back {
        min-height: 400px;
        padding: 1.5rem;
    }
    
    .context-section,
    .question-section,
    .answer-section {
        padding: 1rem;
    }
    
    .rating-section {
        flex-direction: column;
        gap: 1rem;
    }
    
    .rating-buttons,
    .quality-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .rating-btn,
    .quality-btn {
        width: 100%;
        max-width: 200px;
    }
    
    .navigation {
        left: 1rem;
        right: 1rem;
        transform: none;
        width: auto;
        gap: 0.75rem;
        margin: 0;
    }
    
    .nav-btn {
        flex: 1;
        min-width: auto;
    }
    
    .keyboard-help {
        display: block;
    }
    
    .keyboard-help .help-item:not(.mobile-only) {
        display: none;
    }
    
    .mobile-only {
        display: flex !important;
    }
    
    .modal-content {
        margin: 0.5rem;
        max-height: 90vh;
    }
    
    .header-content {
        padding: 0 0.5rem;
    }
    
    .app-logo {
        height: 32px;
    }
    
    .header-controls {
        gap: 0.5rem;
    }
    
    .quality-controls {
        gap: 0.2rem;
    }
    
    .quality-header-btn {
        width: 32px;
        height: 32px;
        font-size: 0.75rem;
    }

    .icon-btn {
        width: 32px;
        height: 32px;
        font-size: 0.75rem;
        padding: 0.25rem;
    }

    .upgrade-btn {
        font-size: 0.7rem;
        padding: 0.25rem 0.4rem;
        white-space: nowrap;
    }
}

@media (max-width: 480px) {
    .card-front,
    .card-back {
        min-height: 350px;
        padding: 1rem;
    }
    
    .card-header h2 {
        font-size: 1.125rem;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .breakdown-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }
    
    .breakdown-label {
        width: auto;
    }
    
    .breakdown-bar {
        width: 100%;
    }
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.flashcard {
    animation: fadeIn 0.5s ease-out;
}

.modal.show .modal-content {
    animation: fadeIn 0.3s ease-out;
}

/* Focus States */
button:focus,
input:focus,
select:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    .flashcard {
        transition: none;
    }
    
    .spinner {
        animation: none;
        border: 4px solid var(--primary-color);
    }
}

/* Upgrade Button */
.upgrade-btn {
    background: linear-gradient(45deg, var(--primary-color), var(--success-color));
    color: white;
    border: none;
    border-radius: 8px;
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-right: 1rem;
}

.upgrade-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

/* Upgrade Modal */
.upgrade-content {
    padding: 1rem;
    max-height: 80vh;
    overflow-y: auto;
}

.current-plan {
    text-align: center;
    margin-bottom: 2rem;
    padding: 1rem;
    background: var(--surface);
    border-radius: 8px;
}

.current-plan h4 {
    color: var(--text-primary);
    font-size: 1.1rem;
}

.upgrade-options {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-bottom: 2rem;
}

/* Ensure upgrade modal is wide enough on desktop */
#upgrade-modal .modal-content {
    max-width: 900px;
    width: 95%;
}

.plan-card {
    position: relative;
    background: var(--card-background);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    text-align: center;
    transition: var(--transition);
    cursor: pointer;
}

.plan-card:hover {
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px var(--shadow);
}

.plan-card.popular {
    border-color: var(--success-color);
    background: linear-gradient(135deg, var(--card-background) 0%, rgba(16, 185, 129, 0.05) 100%);
}

.plan-card.premium {
    border-color: var(--warning-color);
    background: linear-gradient(135deg, var(--card-background) 0%, rgba(245, 158, 11, 0.05) 100%);
}

.plan-badge {
    position: absolute;
    top: -10px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--success-color);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
}

.plan-card.premium .plan-badge {
    background: var(--warning-color);
}

.plan-header {
    margin-bottom: 1rem;
}

.plan-header h4 {
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    font-size: 1.2rem;
}

.plan-price {
    font-size: 2rem;
    font-weight: bold;
    color: var(--primary-color);
    margin-bottom: 1rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
}

.original-price {
    font-size: 1rem;
    font-weight: normal;
    color: var(--muted-color);
    text-decoration: line-through;
    opacity: 0.7;
}

.launch-discount-banner {
    background: linear-gradient(45deg, #f59e0b, #f97316);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 500;
    margin-top: 0.5rem;
    text-align: center;
    box-shadow: 0 2px 8px rgba(245, 158, 11, 0.3);
}

.contact-footer {
    text-align: center;
    padding: 1rem;
    margin-top: 2rem;
    color: var(--muted-color);
    font-size: 0.8rem;
    opacity: 0.7;
}

.contact-footer a {
    color: var(--muted-color);
    text-decoration: none;
}

.contact-footer a:hover {
    text-decoration: underline;
}

.plan-features {
    margin-bottom: 1.5rem;
    text-align: left;
}

.plan-features p {
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.plan-btn {
    width: 100%;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    padding: 0.75rem 1rem;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.plan-btn:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
}

.plan-card.popular .plan-btn {
    background: var(--success-color);
}

.plan-card.popular .plan-btn:hover {
    background: #0d9f66;
}

.plan-card.premium .plan-btn {
    background: var(--warning-color);
}

.plan-card.premium .plan-btn:hover {
    background: #d97706;
}

.payment-info {
    text-align: center;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.payment-info p {
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.payment-info i {
    color: var(--success-color);
}

@media (max-width: 768px) {
    .upgrade-options {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    #upgrade-modal .modal-content {
        max-width: 95%;
        margin: 1rem;
        max-height: 90vh;
    }

    .upgrade-content {
        padding: 0.5rem;
        max-height: 75vh;
    }

    .upgrade-btn {
        font-size: 0.8rem;
        padding: 0.4rem 0.8rem;
    }

    .plan-card {
        padding: 1rem;
    }
}

@media (max-width: 480px) {
    #upgrade-modal .modal-content {
        margin: 0.5rem;
        max-height: 95vh;
    }

    .upgrade-content {
        max-height: 80vh;
    }
}