/* ===========================
   CSS CUSTOM PROPERTIES
   =========================== */
:root {
    /* Colors - Minimalist Palette */
    --color-bg: #fafafa;
    --color-surface: #ffffff;
    --color-surface-elevated: #ffffff;
    --color-text-primary: #1a1a1a;
    --color-text-secondary: #6b7280;
    --color-text-tertiary: #9ca3af;
    --color-accent: #3b82f6;
    --color-accent-hover: #2563eb;
    --color-accent-light: #dbeafe;
    --color-success: #10b981;
    --color-success-light: #d1fae5;
    --color-error: #ef4444;
    --color-error-light: #fee2e2;
    --color-warning: #f59e0b;
    --color-warning-light: #fef3c7;
    --color-border: #e5e7eb;
    --color-shadow: rgba(0, 0, 0, 0.05);
    --color-shadow-elevated: rgba(0, 0, 0, 0.1);

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;

    /* Border Radius - All Rounded */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 999px;

    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 2.5rem;

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-spring: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 var(--color-shadow);
    --shadow-md: 0 4px 6px -1px var(--color-shadow), 0 2px 4px -1px var(--color-shadow);
    --shadow-lg: 0 10px 15px -3px var(--color-shadow-elevated), 0 4px 6px -2px var(--color-shadow);
    --shadow-xl: 0 20px 25px -5px var(--color-shadow-elevated), 0 10px 10px -5px var(--color-shadow);
}

/* ===========================
   DARK MODE THEME
   =========================== */
[data-theme="dark"] {
    /* Dark Mode Colors - WCAG AA Compliant */
    --color-bg: #1a1a1a;
    --color-surface: #242424;
    --color-surface-elevated: #2a2a2a;
    --color-text-primary: #e8e8e8;
    --color-text-secondary: #a0a0a0;
    --color-text-tertiary: #707070;
    --color-accent: #5b9cf6;
    --color-accent-hover: #4a8ae6;
    --color-accent-light: #2d4a6b;
    --color-success: #4ade80;
    --color-success-light: #1e4d2b;
    --color-error: #f87171;
    --color-error-light: #4d2626;
    --color-warning: #fbbf24;
    --color-warning-light: #4d3d1a;
    --color-border: #3a3a3a;
    --color-shadow: rgba(0, 0, 0, 0.3);
    --color-shadow-elevated: rgba(0, 0, 0, 0.5);
}

/* ===========================
   RESET & BASE STYLES
   =========================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    /* Fix Safari rubber banding background - light mode */
    background-color: #fafafa;
}

/* Fix Safari rubber banding background - dark mode */
html[data-theme="dark"] {
    background-color: #1a1a1a;
}

body {
    font-family: var(--font-family);
    background-color: var(--color-bg);
    color: var(--color-text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

button {
    font-family: inherit;
    border: none;
    cursor: pointer;
    background: none;
    outline: none;
}

/* ===========================
   PROGRESS BAR
   =========================== */
.progress-bar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--color-border);
    z-index: 1000;
    display: none;
}

.progress-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--color-accent), var(--color-accent-hover));
    transition: width var(--transition-base);
}

/* ===========================
   CONTAINER & LAYOUT
   =========================== */
.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-lg) var(--spacing-3xl) var(--spacing-lg);
    min-height: 100vh;
}

.screen {
    display: none;
    opacity: 0;
    animation: fadeIn var(--transition-slow) forwards;
}

.screen.active {
    display: block;
}

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

/* ===========================
   HEADER AREA
   =========================== */
.header-area {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.main-title {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    letter-spacing: -0.025em;
    margin-bottom: var(--spacing-xl);
    background: linear-gradient(135deg, var(--color-text-primary), var(--color-text-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Auth Buttons Container */
.auth-buttons-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
}


/* Time Trials Quick Access Button */
.time-trials-quick-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: 10px var(--spacing-lg);
    background: rgba(100, 181, 246, 0.08);
    border: 2px solid #64B5F6;
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: #64B5F6;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    cursor: pointer;
    height: 48px;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.time-trials-quick-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    background: rgba(100, 181, 246, 0.15);
}

.time-trials-quick-btn:active {
    transform: translateY(0);
    box-shadow: var(--shadow-md);
}

.time-trials-quick-btn svg {
    flex-shrink: 0;
}

/* Topic Targets Button */
.topic-targets-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: 10px var(--spacing-lg);
    background: rgba(229, 115, 115, 0.08);
    border: 2px solid #E57373;
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: #E57373;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    cursor: pointer;
    height: 48px;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.topic-targets-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    background: rgba(229, 115, 115, 0.15);
}

.topic-targets-btn:active:not(:disabled) {
    transform: translateY(0);
    box-shadow: var(--shadow-md);
}

.topic-targets-btn svg {
    flex-shrink: 0;
}

.topic-targets-btn:disabled {
    background: rgba(156, 163, 175, 0.08);
    border-color: #9CA3AF;
    color: #9CA3AF;
    cursor: not-allowed;
    opacity: 0.5;
}

/* Google Sign-In Button */
.google-signin-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: 10px var(--spacing-lg);
    background: var(--color-surface);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text-primary);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    cursor: pointer;
    height: 48px;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.google-signin-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.google-signin-btn:active {
    transform: translateY(0);
    box-shadow: var(--shadow-md);
}

.google-signin-btn svg {
    flex-shrink: 0;
}

/* User Info Display */
.user-info {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-xs) var(--spacing-xs) var(--spacing-xs) var(--spacing-sm);
    background: var(--color-surface);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-md);
    width: fit-content;
    max-width: 100%;
    height: 48px;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.user-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--color-border);
    flex-shrink: 0;
}

.user-name {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text-primary);
    padding-right: var(--spacing-xs);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.signout-icon-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: transparent;
    border: none;
    border-radius: 50%;
    color: var(--color-text-secondary);
    transition: all var(--transition-fast);
    cursor: pointer;
    padding: 0;
}

.signout-icon-btn:hover {
    background: var(--color-error-light);
    color: var(--color-error);
}

.signout-icon-btn:active {
    transform: scale(0.95);
}

.user-info-clickable {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    cursor: pointer;
    transition: opacity var(--transition-fast);
}

.user-info-clickable:hover {
    opacity: 0.8;
}

.user-info-clickable:active {
    opacity: 0.6;
}

/* ===========================
   ACCOUNT SETTINGS SCREEN
   =========================== */
.account-container {
    max-width: 800px;
    margin: 0 auto;
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

/* Profile Card */
.profile-card {
    background: var(--color-surface);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
}

.profile-content {
    display: flex;
    gap: var(--spacing-xl);
    align-items: flex-start;
}

.profile-avatar {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid var(--color-border);
    flex-shrink: 0;
}

.profile-info {
    flex: 1;
    min-width: 0;
}

.profile-signout-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    background: transparent;
    color: var(--color-error);
    border: 2px solid var(--color-error);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    flex-shrink: 0;
    align-self: flex-start;
    margin-left: auto;
    margin-top: 12px;
}

.profile-signout-btn:hover {
    background: var(--color-error);
    color: white;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.profile-signout-btn:active {
    transform: translateY(0);
}

.profile-name-row {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
}

.profile-name {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--color-text-primary);
    margin: 0;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.edit-name-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: var(--radius-md);
    background: transparent;
    border: 1px solid var(--color-border);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

.edit-name-btn:hover {
    background: var(--color-accent-light);
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.profile-email {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin-bottom: 0;
}

.profile-streak {
    margin-top: var(--spacing-sm);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: 8px 12px;
    border-radius: var(--radius-full);
    background: rgba(16, 185, 129, 0.08);
    color: var(--color-success);
    font-size: var(--font-size-sm);
    font-weight: 600;
}

.profile-streak-icon {
    display: inline-flex;
}

.profile-streak-info {
    display: flex;
    flex-direction: column;
    line-height: 1.1;
    color: var(--color-text-primary);
}

.profile-streak-label {
    text-transform: uppercase;
    font-size: var(--font-size-xs);
    letter-spacing: 0.08em;
    color: var(--color-text-tertiary);
    font-weight: 600;
}

.profile-streak-values {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-weight: 700;
    color: var(--color-text-primary);
}

.profile-streak-divider {
    color: var(--color-text-tertiary);
}

.profile-edit-form {
    margin-top: var(--spacing-md);
}

.profile-name-input {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    color: var(--color-text-primary);
    background: var(--color-bg);
    transition: all var(--transition-fast);
    margin-bottom: var(--spacing-sm);
}

.profile-name-input:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(100, 181, 246, 0.1);
}

.profile-edit-actions {
    display: flex;
    gap: var(--spacing-sm);
}

.btn-save,
.btn-cancel {
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    border: none;
}

.btn-save {
    background: var(--color-accent);
    color: white;
}

.btn-save:hover {
    background: #4fa3e8;
    box-shadow: var(--shadow-md);
}

.btn-cancel {
    background: transparent;
    border: 2px solid var(--color-border);
    color: var(--color-text-secondary);
}

.btn-cancel:hover {
    background: var(--color-surface);
    border-color: var(--color-text-secondary);
}

/* Settings Cards */
.settings-card {
    background: var(--color-surface);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-3xl);
    box-shadow: var(--shadow-sm);
}

.settings-header {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.settings-header svg {
    color: var(--color-accent);
    flex-shrink: 0;
    margin-top: 2px;
}

.settings-title {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--color-text-primary);
    margin: 0 0 var(--spacing-xs) 0;
}

.settings-subtitle {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin: 0;
}

/* Theme Selection */
.theme-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
    margin-left: calc(var(--spacing-xl) * -1);
    margin-right: calc(var(--spacing-xl) * -1);
    margin-bottom: calc(var(--spacing-lg) * -1);
    padding: 0 var(--spacing-xl);
}

@media (max-width: 640px) {
    .theme-grid {
        grid-template-columns: 1fr;
    }
}

.theme-option {
    cursor: pointer;
    transition: all var(--transition-fast);
}

.theme-option:hover .theme-visual {
    transform: translateY(-2px);
}

.theme-option.selected .theme-visual {
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(100, 181, 246, 0.15);
}

.theme-visual {
    position: relative;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    transition: all var(--transition-fast);
    overflow: hidden;
}

.theme-mock {
    border-radius: var(--radius-sm);
    padding: var(--spacing-md);
    aspect-ratio: 16/10;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.theme-mock-light {
    background: #ffffff;
    border: 1px solid #e5e7eb;
}

.theme-mock-dark {
    background: #1a1a1a;
    border: 1px solid #2a2a2a;
}

.theme-mock-header {
    height: 8px;
    border-radius: var(--radius-sm);
}

.theme-mock-light .theme-mock-header {
    background: #e5e7eb;
}

.theme-mock-dark .theme-mock-header {
    background: #374151;
}

.theme-mock-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.theme-mock-line {
    height: 6px;
    border-radius: var(--radius-sm);
}

.theme-mock-light .theme-mock-line {
    background: #f3f4f6;
}

.theme-mock-dark .theme-mock-line {
    background: #2a2a2a;
}

.theme-mock-line.short {
    width: 60%;
}

.theme-mock-palette {
    display: flex;
    gap: 4px;
    margin-top: auto;
}

.theme-mock-palette span {
    flex: 1;
    height: 12px;
    border-radius: 3px;
}

.theme-check {
    position: absolute;
    top: 8px;
    right: 8px;
    width: 24px;
    height: 24px;
    background: var(--color-accent);
    border-radius: 50%;
    display: none;
    align-items: center;
    justify-content: center;
    color: white;
}

.theme-option.selected .theme-check {
    display: flex;
}

.theme-label {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text-secondary);
}

.theme-label svg {
    width: 20px;
    height: 20px;
}

/* ===========================
   TOPIC BREAKDOWN
   =========================== */
.topic-breakdown-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
    margin-top: var(--spacing-lg);
    margin-left: calc(var(--spacing-xl) * -1);
    margin-right: calc(var(--spacing-xl) * -1);
    margin-bottom: calc(var(--spacing-lg) * -1);
}

.topic-breakdown-loading {
    text-align: center;
    padding: var(--spacing-2xl);
    color: var(--color-text-secondary);
    font-size: var(--font-size-base);
}

.topic-breakdown-item {
    padding: var(--spacing-lg);
    background: var(--color-bg);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
}

.topic-breakdown-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-md);
}

.topic-breakdown-name {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-text-primary);
}

.topic-breakdown-stats {
    display: flex;
    gap: var(--spacing-md);
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.topic-breakdown-progress {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.progress-row {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.progress-row-label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
}

.progress-row-label-left {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.progress-row-label-right {
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
}

.multi-segment-progress-bar {
    height: 8px;
    background: var(--color-border);
    border-radius: var(--radius-full);
    overflow: hidden;
    display: flex;
}

.progress-segment {
    height: 100%;
    transition: width var(--transition-base);
}

.progress-segment.green {
    background: var(--color-success);
}

.progress-segment.yellow {
    background: #f59e0b;
}

.progress-segment.red {
    background: var(--color-error);
}

.progress-segment.grey {
    background: #9ca3af;
}

.progress-legend {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-xs);
    font-size: var(--font-size-xs);
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 4px;
    color: var(--color-text-tertiary);
}

.legend-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
}

@media (max-width: 640px) {
    .profile-content {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .profile-avatar {
        width: 96px;
        height: 96px;
    }

    .profile-name-row {
        justify-content: center;
    }

    .profile-signout-btn {
        margin-left: 0;
        width: 100%;
        justify-content: center;
    }
}

.screen-title {
    font-size: var(--font-size-3xl);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-primary);
}

.subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    font-weight: 400;
}

/* ===========================
   BACK BUTTON
   =========================== */
.back-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    font-weight: 500;
    transition: all var(--transition-fast);
    margin-bottom: var(--spacing-xl);
    box-shadow: var(--shadow-sm);
    position: relative;
    z-index: 20;
}

.back-btn:hover {
    background: var(--color-accent-light);
    color: var(--color-accent);
    border-color: var(--color-accent);
    transform: translateX(-2px);
}

.back-btn:active {
    transform: translateX(-2px) scale(0.98);
}

/* ===========================
   TOPIC GRID
   =========================== */
.topic-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(380px, 1fr));
    gap: var(--spacing-lg);
}

.topic-card {
    background: var(--color-surface);
    border: 3.5px dotted var(--topic-color, var(--color-accent));
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    cursor: pointer;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-sm);
    position: relative;
    overflow: hidden;
}

.topic-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--topic-color, var(--color-accent));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-base);
}

.topic-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--topic-color, var(--color-accent));
}

.topic-card:hover::before {
    transform: scaleX(1);
}

.topic-card:active {
    transform: translateY(-2px);
}

.topic-card h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-primary);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.topic-number-prefix {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--topic-color, var(--color-accent));
    flex-shrink: 0;
}

.topic-number-prefix.no-number {
    font-size: var(--font-size-xl);
    color: var(--topic-color, var(--color-accent));
}

.topic-divider {
    color: var(--color-text-tertiary);
    font-weight: 300;
    font-size: var(--font-size-2xl);
}

.topic-name {
    color: var(--topic-color, var(--color-accent));
    flex: 1;
}

.topic-card p {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
}

.topic-stats {
    display: flex;
    gap: var(--spacing-md);
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
}

.topic-stat {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

/* ===========================
   WEEKLY LEADERBOARD
   =========================== */
.leaderboard-card {
    margin-top: var(--spacing-2xl);
    padding: var(--spacing-2xl);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-xl);
    background: var(--color-surface);
    box-shadow: var(--shadow-md);
}

.leaderboard-header {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.leaderboard-header h2 {
    font-size: var(--font-size-2xl);
    margin: 0;
    color: var(--color-text-primary);
}

.leaderboard-updated {
    font-size: var(--font-size-sm);
    color: var(--color-text-tertiary);
}

.leaderboard-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.leaderboard-item {
    display: grid;
    grid-template-columns: auto 1fr auto;
    align-items: center;
    gap: var(--spacing-lg);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-lg);
    background: var(--color-bg);
    border: 1px solid var(--color-border);
}

.leaderboard-item.placeholder {
    background: var(--color-surface);
    border-style: dashed;
    color: var(--color-text-tertiary);
    min-height: 56px;
    position: relative;
    overflow: hidden;
}

.leaderboard-item.placeholder::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg, rgba(255, 255, 255, 0), rgba(100, 181, 246, 0.15), rgba(255, 255, 255, 0));
    animation: leaderboard-pulse 1.5s infinite;
}

.leaderboard-rank {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-accent);
}

.leaderboard-user {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.leaderboard-name {
    font-weight: 600;
    color: var(--color-text-primary);
}

.leaderboard-meta {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.leaderboard-score {
    font-weight: 700;
    color: var(--color-success);
    font-size: var(--font-size-lg);
}

.leaderboard-empty {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    text-align: center;
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    background: rgba(100, 149, 237, 0.05);
    margin-top: var(--spacing-lg);
}

@keyframes leaderboard-pulse {
    0% { transform: translateX(-100%); }
    50% { transform: translateX(0%); }
    100% { transform: translateX(100%); }
}

@media (max-width: 768px) {
    .leaderboard-item {
        grid-template-columns: auto 1fr;
        grid-template-rows: auto auto;
        align-items: flex-start;
    }

    .leaderboard-score {
        grid-column: span 2;
        justify-self: flex-end;
    }

    .leaderboard-header {
        flex-direction: column;
        align-items: flex-start;
    }
}

/* ===========================
   MODE CARDS
   =========================== */
.mode-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
}

.mode-card {
    background: var(--color-surface);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-2xl);
    cursor: pointer;
    transition: all var(--transition-base);
    text-align: center;
    box-shadow: var(--shadow-md);
}

.mode-card.disabled {
    opacity: 0.45;
    cursor: not-allowed;
    pointer-events: none;
    filter: grayscale(0.15);
}

.mode-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--color-accent);
}

.mode-card:active {
    transform: translateY(-4px);
}

.mode-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-accent-light);
    color: var(--color-accent);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
}

.mode-card.disabled .mode-icon {
    background: var(--color-border);
    color: var(--color-text-tertiary);
    transform: none;
}

.mode-card:hover .mode-icon {
    background: var(--color-accent);
    color: white;
    transform: scale(1.1) rotate(5deg);
}

.mode-card h3 {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-primary);
}

.mode-card.disabled h3,
.mode-card.disabled p,
.mode-card.disabled .card-count {
    color: var(--color-text-tertiary);
}

.mode-card p {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
}

.card-count-container {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.card-count {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    background: var(--color-accent-light);
    color: var(--color-accent);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: 600;
    line-height: 1;
}

/* ===========================
   ALL TOPICS MODE CARDS (Mode Selection Screen)
   =========================== */
#mode-screen.rainbow-mode .mode-card {
    border-color: var(--all-topics-color);
}

#mode-screen.rainbow-mode .mode-card:hover {
    border-color: var(--all-topics-color);
}

#mode-screen.rainbow-mode .mode-card .mode-icon {
    background: var(--all-topics-color-light);
    color: var(--all-topics-color);
}

#mode-screen.rainbow-mode .mode-card:hover .mode-icon {
    background: var(--all-topics-color);
    color: var(--color-surface);
}

#mode-screen.rainbow-mode .mode-card .card-count {
    background: var(--all-topics-color-light);
    color: var(--all-topics-color);
}

#mode-screen.rainbow-mode .back-btn {
    color: var(--all-topics-color);
    border-color: var(--all-topics-color-light);
}

#mode-screen.rainbow-mode .back-btn:hover {
    background: var(--all-topics-color-light);
    color: var(--all-topics-color);
    border-color: var(--all-topics-color);
}

.anki-download-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: var(--spacing-xs) var(--spacing-md);
    background: rgba(186, 104, 200, 0.15);
    color: #BA68C8;
    border: none;
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: 600;
    line-height: 1;
    cursor: pointer;
    transition: all var(--transition-base);
    box-shadow: none;
    font-family: var(--font-family);
}

.anki-download-btn:hover {
    background: rgba(186, 104, 200, 0.25);
    transform: translateY(-2px);
}

.anki-download-btn:active {
    transform: translateY(0);
    background: rgba(186, 104, 200, 0.2);
}

.anki-download-btn svg {
    flex-shrink: 0;
    width: 14px;
    height: 14px;
}

/* ===========================
   STUDY HEADER
   =========================== */
.study-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.study-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.card-counter {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-text-primary);
}

.subtopic-tag {
    padding: var(--spacing-xs) var(--spacing-md);
    background: var(--color-accent-light);
    color: var(--color-accent);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: 500;
}

.type-tag {
    padding: var(--spacing-xs) var(--spacing-md);
    background: var(--color-surface-elevated);
    color: var(--color-text-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: 500;
}

/* Dark mode overrides for subtopic and type tags */
[data-theme="dark"] .subtopic-tag {
    background: rgba(91, 156, 246, 0.15);
    color: #a8caff;
}

[data-theme="dark"] .type-tag {
    background: rgba(91, 156, 246, 0.1);
    color: #b0b0b0;
    border-color: rgba(91, 156, 246, 0.2);
}

.card-list-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.card-list-btn:hover {
    background: var(--color-accent-light);
    color: var(--color-accent);
    border-color: var(--color-accent);
    transform: translateY(-2px);
}

.card-list-btn:active {
    transform: translateY(0);
}

.score-display {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--color-text-secondary);
}

.score-display span {
    color: var(--color-accent);
}

/* ===========================
   FLASHCARD
   =========================== */
.card-container {
    perspective: 1000px;
    margin-bottom: var(--spacing-2xl);
}

.flashcard {
    position: relative;
    width: 100%;
    min-height: 400px;
    cursor: pointer;
}

.flashcard-inner {
    position: relative;
    width: 100%;
    height: 100%;
    min-height: 400px;
    transition: transform var(--transition-slow);
    transform-style: preserve-3d;
}

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

.flashcard-front,
.flashcard-back {
    position: absolute;
    width: 100%;
    height: 100%;
    min-height: 400px;
    background: var(--color-surface);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    box-shadow: var(--shadow-lg);
    transition: box-shadow var(--transition-base), border-color var(--transition-base);
}

.flashcard:hover .flashcard-front,
.flashcard:hover .flashcard-back {
    box-shadow: var(--shadow-xl);
    border-color: var(--color-accent);
}

.flashcard-back {
    transform: rotateX(180deg);
}

.card-label {
    position: absolute;
    top: var(--spacing-lg);
    left: var(--spacing-lg);
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-tertiary);
}

.card-content {
    font-size: var(--font-size-xl);
    line-height: 1.7;
    color: var(--color-text-primary);
    text-align: center;
    padding: var(--spacing-xl);
}

.flip-hint {
    position: absolute;
    bottom: var(--spacing-lg);
    font-size: var(--font-size-sm);
    color: var(--color-text-tertiary);
    opacity: 0.6;
}

/* ===========================
   CONFIDENCE SELECTOR - TRAFFIC LIGHTS
   =========================== */
.confidence-selector {
    margin-bottom: var(--spacing-2xl);
    text-align: center;
}

.confidence-label {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
    font-weight: 500;
}

.traffic-lights {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-lg);
}

.traffic-light {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    border: 3px solid var(--color-border);
    cursor: pointer;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-md);
    position: relative;
}

.traffic-light::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 0;
    height: 0;
    border-radius: 50%;
    transition: all var(--transition-base);
}

.traffic-light:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-lg);
}

.traffic-light:active {
    transform: scale(1.05);
}

.traffic-light.red {
    background: var(--color-error);
    border-color: var(--color-error);
}

.traffic-light.amber {
    background: var(--color-warning);
    border-color: var(--color-warning);
}

.traffic-light.green {
    background: var(--color-success);
    border-color: var(--color-success);
}

.traffic-light:hover::after {
    width: 16px;
    height: 16px;
    background: white;
    opacity: 0.8;
}

/* ===========================
   QUESTION CARD
   =========================== */
.question-container {
    margin-bottom: var(--spacing-xl);
}

.question-card {
    background: var(--color-surface);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    box-shadow: var(--shadow-lg);
}

.question-text {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-2xl);
    line-height: 1.5;
}

.answers-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.answer-option {
    padding: var(--spacing-lg);
    background: var(--color-bg);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
    font-size: var(--font-size-base);
    color: var(--color-text-primary);
    text-align: left;
    position: relative;
    overflow: hidden;
    opacity: 0;
    animation: slideInAnswer var(--transition-base) forwards;
}

.answer-option:nth-child(1) { animation-delay: 0ms; }
.answer-option:nth-child(2) { animation-delay: 50ms; }
.answer-option:nth-child(3) { animation-delay: 100ms; }
.answer-option:nth-child(4) { animation-delay: 150ms; }

@keyframes slideInAnswer {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.answer-option:hover:not(.disabled):not(.correct):not(.incorrect) {
    transform: translateX(4px);
    background: var(--color-accent-light);
    border-color: var(--color-accent);
}

.answer-option.selected {
    border-width: 2px;
}

.answer-option.correct {
    background: var(--color-success-light) !important;
    border-color: var(--color-success) !important;
    color: var(--color-success) !important;
    font-weight: 600;
}

.answer-option.incorrect {
    background: var(--color-error-light) !important;
    border-color: var(--color-error) !important;
    color: var(--color-error) !important;
}

.answer-option.disabled {
    cursor: not-allowed;
    opacity: 0.6;
}

/* Dark mode override for answer option hover */
[data-theme="dark"] .answer-option:hover:not(.disabled):not(.correct):not(.incorrect) {
    background: rgba(91, 156, 246, 0.15);
    border-color: var(--color-accent);
}

/* ===========================
   LONG QUESTIONS
   =========================== */
.long-question-list-wrapper {
    max-width: 960px;
    margin: var(--spacing-xl) auto 0;
}

.long-question-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.long-question-empty {
    padding: var(--spacing-2xl);
    border: 2px dashed var(--color-border);
    border-radius: var(--radius-lg);
    text-align: center;
    color: var(--color-text-secondary);
    font-size: var(--font-size-base);
}

.long-question-list-card {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: var(--spacing-lg);
    align-items: center;
    padding: var(--spacing-lg) var(--spacing-xl);
    background: var(--color-surface);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
    width: 100%;
    min-height: 140px;
    text-align: left;
    cursor: pointer;
}

.long-question-list-card:hover,
.long-question-list-card:focus {
    transform: translateY(-3px);
    border-color: var(--color-accent);
    box-shadow: var(--shadow-lg);
    outline: none;
}

.long-question-list-card:focus-visible {
    outline: 3px solid var(--color-accent);
    outline-offset: 4px;
}

.long-question-list-card.current {
    border-color: var(--color-accent);
    box-shadow: var(--shadow-lg);
}

.long-question-card-body {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.long-question-card-question {
    font-size: clamp(1rem, 2vw, 1.25rem);
    font-weight: 600;
    color: var(--color-text-primary);
    margin: 0;
}

.long-question-card-meta {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.long-question-card-marks {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: var(--spacing-xs);
    min-width: 80px;
}

.marks-value {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--color-accent);
    line-height: 1;
}

.marks-label {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.long-question-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-md);
}

.long-question-detail {
    max-width: 960px;
    margin: var(--spacing-xl) auto 0;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

#long-question-marks-chip.hidden {
    display: none;
}

.marks-chip {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    background: var(--color-accent);
    color: white;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-full);
    font-weight: 600;
    font-size: var(--font-size-sm);
}

.marks-chip .marks-count {
    font-size: var(--font-size-lg);
}

.long-question-source {
    display: none;
}

.long-question-text {
    font-size: clamp(1.25rem, 2.6vw, 1.6rem);
    font-weight: 600;
    line-height: 1.6;
    color: var(--color-text-primary);
    margin: var(--spacing-xs) 0 var(--spacing-lg);
}

.long-answer-workspace {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.response-label {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.response-input {
    width: 100%;
    min-height: 720px;
    padding: var(--spacing-lg);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-lg);
    font-family: var(--font-family);
    line-height: 1.6;
    resize: vertical;
    background: var(--color-surface);
    color: var(--color-text-primary);
    box-shadow: var(--shadow-sm);
    transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.dark-mode .response-input,
[data-theme="dark"] .response-input {
    color: var(--color-text-primary);
}

.response-input:focus {
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(91, 156, 246, 0.2);
    outline: none;
}

#long-question-screen.rainbow-theme .response-input:focus,
#long-question-screen.rainbow-theme .response-input:focus-visible {
    border-color: var(--all-topics-color);
    box-shadow: 0 0 0 3px var(--all-topics-color-light);
}

.long-question-footer {
    display: flex;
    justify-content: flex-end;
    align-items: center;
    gap: var(--spacing-md);
    margin-top: var(--spacing-xl);
}

.show-mark-scheme-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md) var(--spacing-xl);
    background: var(--color-surface);
    color: var(--color-text-primary);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-full);
    font-size: var(--font-size-base);
    font-weight: 600;
    cursor: pointer;
    transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base), color var(--transition-base);
    box-shadow: var(--shadow-sm);
}

.show-mark-scheme-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.show-mark-scheme-btn:active {
    transform: translateY(0);
}

.show-mark-scheme-btn.revealed {
    background: var(--color-surface);
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.mark-now-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    background: var(--color-success);
    color: var(--color-surface);
    border: none;
    border-radius: var(--radius-full);
    font-size: var(--font-size-base);
    font-weight: 600;
    cursor: pointer;
    transition: transform var(--transition-base), box-shadow var(--transition-base), background var(--transition-base);
    box-shadow: var(--shadow-md);
}

.mark-now-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    background: var(--color-success);
    opacity: 0.95;
}

.mark-now-btn:active {
    transform: translateY(0);
}

.mark-now-btn.disabled,
.mark-now-btn:disabled {
    opacity: 0.45;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
    background: var(--color-success);
    color: var(--color-surface);
}

.mark-now-btn.loading {
    opacity: 0.65;
    cursor: progress;
    pointer-events: none;
}

.mark-now-btn .marking-loader {
    display: inline-flex;
    gap: 2px;
    font-weight: 700;
    color: inherit;
}

.mark-now-btn .marking-loader span {
    animation: marking-dots 1s ease-in-out infinite;
    opacity: 0.25;
}

.mark-now-btn .marking-loader span:nth-child(1) {
    animation-delay: 0s;
}

.mark-now-btn .marking-loader span:nth-child(2) {
    animation-delay: 0.2s;
}

.mark-now-btn .marking-loader span:nth-child(3) {
    animation-delay: 0.4s;
}

.mark-now-btn .marking-text {
    font-weight: 600;
}

.mark-now-btn.completed {
    opacity: 0.85;
}

.mark-now-btn.completed:hover {
    opacity: 0.85;
    transform: none;
    box-shadow: none;
    cursor: not-allowed;
}

.mark-now-btn.revealed {
    background: var(--color-surface);
    color: var(--color-success);
    border: 2px solid var(--color-success);
}

.mark-btn-icon {
    display: inline-flex;
}

@keyframes marking-dots {
    0%, 60%, 100% {
        opacity: 0.25;
        transform: translateY(0);
    }
    30% {
        opacity: 1;
        transform: translateY(-2px);
    }
}

.long-mark-scheme {
    display: none;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-2xl);
    background: var(--color-surface);
    box-shadow: var(--shadow-md);
}

.long-mark-scheme.visible {
    display: block;
}

.mark-scheme-section + .mark-scheme-section {
    margin-top: var(--spacing-xl);
}

.mark-scheme-section h4 {
    margin-bottom: var(--spacing-md);
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.mark-scheme-levels,
.mark-scheme-notes {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.mark-scheme-levels li {
    background: var(--color-bg);
    border-radius: var(--radius-md);
    padding: var(--spacing-md) var(--spacing-lg);
    border-left: 4px solid var(--color-accent);
}

.mark-scheme-level {
    display: block;
    font-weight: 700;
    color: var(--color-accent);
    margin-bottom: var(--spacing-xs);
}

.mark-scheme-level + p {
    margin: 0;
    color: var(--color-text-primary);
    line-height: 1.6;
}

.mark-scheme-notes li {
    position: relative;
    padding-left: var(--spacing-lg);
    color: var(--color-text-primary);
    line-height: 1.6;
}

.mark-scheme-notes li::before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--color-accent);
    font-weight: 700;
}

.mark-scheme-placeholder {
    margin: 0;
    color: var(--color-text-secondary);
    font-style: italic;
}

@media (max-width: 768px) {
    .long-question-list-card {
        aspect-ratio: auto;
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .long-question-card-marks {
        flex-direction: row;
        align-items: center;
        justify-content: flex-start;
    }

    .long-question-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-sm);
    }

    .long-question-header .marks-chip {
        margin-top: var(--spacing-xs);
    }

.long-question-footer {
        justify-content: center;
        flex-direction: column;
    }

    .show-mark-scheme-btn,
    .mark-now-btn {
        width: 100%;
    }

    .mark-now-btn {
        justify-content: center;
    }
}

.long-mark-result {
    display: none;
    margin-top: var(--spacing-lg);
    padding: var(--spacing-xl);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    background: var(--color-surface);
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-base), opacity var(--transition-base);
}

.long-mark-result[hidden] {
    display: none !important;
}

.long-mark-result.visible {
    display: block;
    opacity: 1;
}

.mark-result-header {
    display: flex;
    justify-content: space-between;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
    align-items: baseline;
}

.mark-result-score {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.mark-result-label {
    font-size: var(--font-size-sm);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--color-text-secondary);
    font-weight: 600;
}

.mark-result-score-values {
    display: flex;
    align-items: baseline;
    gap: var(--spacing-xs);
    font-weight: 700;
    color: var(--color-text-primary);
}

.mark-result-awarded {
    font-size: var(--font-size-3xl);
}

.mark-result-divider {
    font-size: var(--font-size-xl);
    color: var(--color-text-secondary);
}

.mark-result-max {
    font-size: var(--font-size-xl);
    color: var(--color-text-secondary);
}

.mark-result-meta {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    font-weight: 500;
}

.mark-result-progress {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin: var(--spacing-md) 0 var(--spacing-lg);
}

.mark-result-progress-track {
    flex: 1;
    height: 8px;
    border-radius: var(--radius-full);
    background: var(--color-border);
    overflow: hidden;
}

.mark-result-progress-fill {
    height: 100%;
    width: 0;
    background: var(--color-success);
    transition: width var(--transition-base);
}

.mark-result-percent {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text-secondary);
    min-width: 48px;
    text-align: right;
}

.mark-result-summary {
    font-size: var(--font-size-base);
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.7;
}

.mark-result-columns {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.mark-result-column h4 {
    font-size: var(--font-size-sm);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-sm);
}

.mark-result-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.mark-result-list li {
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    background: var(--color-bg);
    color: var(--color-text-primary);
    border-left: 3px solid var(--color-accent);
}

.mark-result-list li.mark-result-empty {
    font-style: italic;
    color: var(--color-text-secondary);
    background: transparent;
    border-left-color: transparent;
    padding-left: 0;
}

.long-mark-result[data-band] .mark-result-list li.mark-result-empty {
    background: transparent;
    border-left-color: transparent;
}

.mark-result-notes summary {
    font-weight: 600;
    cursor: pointer;
    margin-bottom: var(--spacing-xs);
}

.mark-result-notes p {
    margin: 0;
    color: var(--color-text-primary);
    line-height: 1.6;
}

.long-mark-result[data-band="excellent"] {
    border-color: var(--color-success);
}

.long-mark-result[data-band="excellent"] .mark-result-progress-fill,
.long-mark-result[data-band="excellent"] .mark-result-list li {
    border-left-color: var(--color-success);
    background: rgba(16, 185, 129, 0.12);
}

.long-mark-result[data-band="secure"] {
    border-color: var(--color-accent);
}

.long-mark-result[data-band="secure"] .mark-result-progress-fill,
.long-mark-result[data-band="secure"] .mark-result-list li {
    border-left-color: var(--color-accent);
    background: rgba(59, 130, 246, 0.12);
}

.long-mark-result[data-band="developing"] {
    border-color: var(--color-warning);
}

.long-mark-result[data-band="developing"] .mark-result-progress-fill,
.long-mark-result[data-band="developing"] .mark-result-list li {
    border-left-color: var(--color-warning);
    background: rgba(245, 158, 11, 0.12);
}

.long-mark-result[data-band="foundation"] {
    border-color: var(--color-error);
}

.long-mark-result[data-band="foundation"] .mark-result-progress-fill,
.long-mark-result[data-band="foundation"] .mark-result-list li {
    border-left-color: var(--color-error);
    background: rgba(239, 68, 68, 0.12);
}

.long-mark-result[data-band="unknown"] .mark-result-progress-fill {
    background: var(--color-text-secondary);
}

.long-mark-result[data-band="unknown"] .mark-result-list li {
    border-left-color: var(--color-text-secondary);
}

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

    .mark-result-progress {
        flex-direction: column;
        align-items: stretch;
    }

    .mark-result-percent {
        text-align: left;
    }
}

/* ===========================
   QUESTION FEEDBACK
   =========================== */
.question-feedback {
    margin-bottom: var(--spacing-xl);
    opacity: 0;
    max-height: 0;
    overflow: hidden;
    transition: all var(--transition-base);
}

.question-feedback.show {
    opacity: 1;
    max-height: 200px;
}

.feedback-content {
    background: var(--color-surface);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.feedback-icon {
    font-size: var(--font-size-3xl);
    flex-shrink: 0;
}

.feedback-message {
    font-size: var(--font-size-base);
    color: var(--color-text-primary);
    font-weight: 500;
}

/* ===========================
   NAVIGATION BUTTONS
   =========================== */
.navigation-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: space-between;
}

.nav-btn {
    flex: 1;
    padding: var(--spacing-md) var(--spacing-xl);
    background: var(--color-surface);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-full);
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--color-text-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    transition: all var(--transition-base);
    box-shadow: var(--shadow-sm);
}

.nav-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-accent);
}

.nav-btn:active:not(:disabled) {
    transform: translateY(0);
}

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

.nav-btn.primary:hover:not(:disabled) {
    background: var(--color-accent-hover);
    border-color: var(--color-accent-hover);
}

.nav-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* ===========================
   RESULTS SCREEN
   =========================== */
.results-container {
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
}

.results-header {
    margin-bottom: var(--spacing-2xl);
}

.results-icon {
    font-size: 5rem;
    margin-bottom: var(--spacing-lg);
    animation: bounceIn var(--transition-spring);
}

@keyframes bounceIn {
    0% {
        transform: scale(0);
        opacity: 0;
    }
    50% {
        transform: scale(1.2);
    }
    100% {
        transform: scale(1);
        opacity: 1;
    }
}

.results-header h2 {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--color-text-primary);
}

.results-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

.stat-card {
    background: var(--color-surface);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    animation: slideUp var(--transition-base) forwards;
    opacity: 0;
}

.stat-card:nth-child(1) { animation-delay: 100ms; }
.stat-card:nth-child(2) { animation-delay: 200ms; }
.stat-card:nth-child(3) { animation-delay: 300ms; }
.stat-card:nth-child(4) { animation-delay: 400ms; }

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

.stat-value {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--color-accent);
    margin-bottom: var(--spacing-xs);
}

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

.question-review-section {
    margin-bottom: var(--spacing-2xl);
}

.review-title {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-lg);
    text-align: left;
}

.question-review {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    max-height: 500px;
    overflow-y: auto;
    padding: var(--spacing-sm);
}

.review-item {
    background: var(--color-surface);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    display: flex;
    gap: var(--spacing-md);
    transition: all var(--transition-base);
    animation: slideUp var(--transition-base) forwards;
    opacity: 0;
}

.review-item:nth-child(1) { animation-delay: 600ms; }
.review-item:nth-child(2) { animation-delay: 650ms; }
.review-item:nth-child(3) { animation-delay: 700ms; }
.review-item:nth-child(4) { animation-delay: 750ms; }
.review-item:nth-child(5) { animation-delay: 800ms; }
.review-item:nth-child(n+6) { animation-delay: 850ms; }

.review-item.correct {
    border-left: 4px solid var(--color-success);
    background: var(--color-success-light);
}

.review-item.incorrect {
    border-left: 4px solid var(--color-error);
    background: var(--color-error-light);
}

.review-number {
    flex-shrink: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-border);
    color: var(--color-text-primary);
    font-size: var(--font-size-sm);
    font-weight: 700;
    border-radius: 50%;
}

.review-item.correct .review-number {
    background: var(--color-success);
    color: white;
}

.review-item.incorrect .review-number {
    background: var(--color-error);
    color: white;
}

.review-content {
    flex: 1;
}

.review-question {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
}

.review-answers {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.review-answer {
    font-size: var(--font-size-sm);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
}

.review-answer.user-answer.correct {
    color: var(--color-success);
    font-weight: 600;
}

.review-answer.user-answer.incorrect {
    color: var(--color-error);
    font-weight: 600;
}

.review-answer.correct-answer {
    color: var(--color-success);
    font-weight: 500;
}

.results-actions {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

/* ===========================
   LOADING OVERLAY
   =========================== */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(250, 250, 250, 0.95);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    backdrop-filter: blur(8px);
}

[data-theme="dark"] .loading-overlay {
    background: rgba(26, 26, 26, 0.95);
}

.loading-overlay.show {
    display: flex;
}

.loading-spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--color-border);
    border-top-color: var(--color-accent);
    border-radius: 50%;
    animation: spin 800ms linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* ===========================
   RESPONSIVE DESIGN
   =========================== */
@media (max-width: 640px) {
    .container {
        padding: var(--spacing-lg) var(--spacing-md);
    }

    .main-title {
        font-size: var(--font-size-3xl);
    }

    .screen-title {
        font-size: var(--font-size-2xl);
    }

    .topic-grid {
        grid-template-columns: 1fr;
    }

    .mode-cards {
        grid-template-columns: 1fr;
    }

    .flashcard,
    .flashcard-front,
    .flashcard-back,
    .flashcard-inner {
        min-height: 350px;
    }

    .card-content {
        font-size: var(--font-size-lg);
    }

    .question-text {
        font-size: var(--font-size-xl);
    }

    .confidence-buttons {
        grid-template-columns: 1fr;
    }

    .results-stats {
        grid-template-columns: 1fr;
    }

    .navigation-buttons {
        flex-direction: column;
    }

    .nav-btn {
        width: 100%;
    }
}

/* ===========================
   STICKY DOCK - COMMENTED OUT
   See STICKY_DOCK_IMPLEMENTATION.md for details
   =========================== */
/*
.sticky-dock {
    position: fixed;
    top: var(--spacing-md);
    left: 50%;
    transform: translate(-50%, -150%);
    z-index: 200;
    transition: transform var(--transition-base);
    pointer-events: none;
}

.sticky-dock.visible {
    transform: translate(-50%, 0);
    pointer-events: auto;
}

.sticky-dock-content {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-xs);
    background: transparent;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: none;
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-lg);
    width: fit-content;
}

.sticky-dock-content .auth-buttons-container {
    margin-bottom: 0;
    gap: var(--spacing-sm);
}
*/

/* ===========================
   HEADER BLUR GRADIENT
   =========================== */
.header-blur {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 60px;
    background: linear-gradient(to bottom, var(--color-bg) 0%, rgba(250, 250, 250, 0) 100%);
    pointer-events: none;
    z-index: 10;
}

[data-theme="dark"] .header-blur {
    background: linear-gradient(to bottom, var(--color-bg) 0%, rgba(26, 26, 26, 0) 100%);
}

/* ===========================
   FOOTER BLUR GRADIENT
   =========================== */
.footer-blur {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: 60px;
    background: linear-gradient(to top, var(--color-bg) 0%, rgba(250, 250, 250, 0) 100%);
    pointer-events: none;
    z-index: 10;
}

[data-theme="dark"] .footer-blur {
    background: linear-gradient(to top, var(--color-bg) 0%, rgba(26, 26, 26, 0) 100%);
}

/* ===========================
   UTILITY CLASSES
   =========================== */
.hidden {
    display: none !important;
}

.fade-in {
    animation: fadeIn var(--transition-slow) forwards;
}

.slide-in {
    animation: slideInAnswer var(--transition-base) forwards;
}

/* ===========================
   ALL TOPICS CARD RAINBOW STYLING
   =========================== */

.topic-card.all-topics-card {
    position: relative;
    background: var(--color-surface);
    border: none;
}

.topic-card.all-topics-card .rainbow-border-svg {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 10;
}

.topic-card.all-topics-card::before {
    background: linear-gradient(90deg,
        #E57373,
        #FFB74D,
        #FFD54F,
        #81C784,
        #64B5F6,
        #BA68C8
    );
}

.topic-card.all-topics-card > h3,
.topic-card.all-topics-card > p,
.topic-card.all-topics-card > .topic-stats {
    position: relative;
    z-index: 1;
}

.topic-card.all-topics-card .topic-name {
    font-weight: 700;
}

.topic-card.all-topics-card .topic-name.rainbow-text {
    display: flex;
}

.topic-card.all-topics-card .rainbow-letter {
    display: inline-block;
    font-weight: 700;
    animation: letterBounce 2s ease-in-out infinite;
    animation-delay: calc(var(--letter-index, 0) * 0.1s);
}

.topic-card.all-topics-card .rainbow-space {
    width: 0.3em;
}

@keyframes letterBounce {
    0%, 100% {
        transform: translateY(0) scale(1);
    }
    50% {
        transform: translateY(-2px) scale(1.05);
    }
}

.topic-card.all-topics-card .topic-number-prefix {
    background: linear-gradient(135deg,
        #E57373,
        #FFB74D,
        #FFD54F,
        #81C784,
        #64B5F6,
        #BA68C8
    );
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: rainbowShift 3s ease-in-out infinite;
}

@keyframes rainbowShift {
    0%, 100% {
        filter: hue-rotate(0deg) brightness(1);
    }
    50% {
        filter: hue-rotate(20deg) brightness(1.2);
    }
}

/* ===========================
   ALL TOPICS THEME (Simple Off-White/Off-Black)
   =========================== */

/* Define colors for light and dark modes */
:root {
    --all-topics-color: #1a1a1a; /* Off-black for light mode */
    --all-topics-color-light: rgba(26, 26, 26, 0.1);
}

[data-theme="dark"] {
    --all-topics-color: #f5f5f5; /* Off-white for dark mode */
    --all-topics-color-light: rgba(245, 245, 245, 0.1);
}

/* Flashcard Screen All Topics Theme */
/* Keep traffic lights with their original RYG colors - don't override */

#flashcard-screen.rainbow-theme .subtopic-tag {
    background: var(--all-topics-color-light);
    color: var(--all-topics-color);
    font-weight: 600;
    border: 1px solid var(--all-topics-color-light);
}

#flashcard-screen.rainbow-theme .back-btn {
    color: var(--all-topics-color);
}

#flashcard-screen.rainbow-theme .back-btn:hover {
    background: var(--all-topics-color-light);
    color: var(--all-topics-color);
    border-color: var(--all-topics-color);
}

#flashcard-screen.rainbow-theme .nav-btn:hover:not(:disabled) {
    border-color: var(--all-topics-color);
}

#flashcard-screen.rainbow-theme .nav-btn.primary {
    background: var(--all-topics-color);
    color: var(--color-surface);
    border: none;
}

#flashcard-screen.rainbow-theme .nav-btn.primary:hover:not(:disabled) {
    opacity: 0.9;
}

#flashcard-screen.rainbow-theme .progress-fill {
    background: var(--all-topics-color);
}

/* Question Screen All Topics Theme */
#question-screen.rainbow-theme .answer-option:hover:not(.disabled):not(.correct):not(.incorrect) {
    background: var(--all-topics-color-light);
    border-color: var(--all-topics-color);
}

#question-screen.rainbow-theme .answer-option:nth-child(1):hover:not(.disabled):not(.correct):not(.incorrect) {
    background: var(--all-topics-color-light);
    border-color: var(--all-topics-color);
}

#question-screen.rainbow-theme .answer-option:nth-child(2):hover:not(.disabled):not(.correct):not(.incorrect) {
    background: var(--all-topics-color-light);
    border-color: var(--all-topics-color);
}

#question-screen.rainbow-theme .answer-option:nth-child(3):hover:not(.disabled):not(.correct):not(.incorrect) {
    background: var(--all-topics-color-light);
    border-color: var(--all-topics-color);
}

#question-screen.rainbow-theme .answer-option:nth-child(4):hover:not(.disabled):not(.correct):not(.incorrect) {
    background: var(--all-topics-color-light);
    border-color: var(--all-topics-color);
}

#question-screen.rainbow-theme .subtopic-tag {
    background: var(--all-topics-color-light);
    color: var(--all-topics-color);
    font-weight: 600;
    border: 1px solid var(--all-topics-color-light);
}

#question-screen.rainbow-theme .back-btn {
    color: var(--all-topics-color);
}

#question-screen.rainbow-theme .back-btn:hover {
    background: var(--all-topics-color-light);
    color: var(--all-topics-color);
    border-color: var(--all-topics-color);
}

#question-screen.rainbow-theme .nav-btn:hover:not(:disabled) {
    border-color: var(--all-topics-color);
}

#question-screen.rainbow-theme .nav-btn.primary {
    background: var(--all-topics-color);
    color: var(--color-surface);
    border: none;
}

#question-screen.rainbow-theme .nav-btn.primary:hover:not(:disabled) {
    opacity: 0.9;
}

#question-screen.rainbow-theme .progress-fill {
    background: var(--all-topics-color);
}

/* Long Question Screen All Topics Theme */
#long-question-screen.rainbow-theme .marks-chip {
    background: var(--all-topics-color);
    color: var(--color-surface);
}

#long-question-screen.rainbow-theme .long-question-text {
    border-left-color: var(--all-topics-color);
}

#long-question-screen.rainbow-theme .mark-now-btn {
    background: var(--color-success);
    color: var(--color-surface);
}

#long-question-screen.rainbow-theme .mark-now-btn:hover {
    background: var(--color-success);
    opacity: 0.95;
}

#long-question-screen.rainbow-theme .mark-now-btn.revealed {
    background: var(--color-surface);
    border-color: var(--color-success);
    color: var(--color-success);
}

#long-question-screen.rainbow-theme .mark-now-btn.revealed svg {
    stroke: currentColor;
}

#long-question-screen.rainbow-theme .show-mark-scheme-btn {
    border-color: var(--all-topics-color);
    color: var(--all-topics-color);
}

#long-question-screen.rainbow-theme .show-mark-scheme-btn:hover {
    border-color: var(--all-topics-color);
    background: var(--all-topics-color-light);
    color: var(--all-topics-color);
}

#long-question-screen.rainbow-theme .show-mark-scheme-btn.revealed {
    background: var(--all-topics-color);
    color: var(--color-surface);
}

#long-question-screen.rainbow-theme .show-mark-scheme-btn.revealed:hover {
    background: var(--all-topics-color);
    opacity: 0.95;
}

#long-question-screen.rainbow-theme .long-mark-scheme {
    border-color: var(--all-topics-color);
}

#long-question-screen.rainbow-theme .mark-scheme-levels li {
    border-left-color: var(--all-topics-color);
}

#long-question-screen.rainbow-theme .mark-scheme-level {
    color: var(--all-topics-color);
}

#long-question-screen.rainbow-theme .mark-scheme-notes li::before {
    color: var(--all-topics-color);
}

#long-question-screen.rainbow-theme .subtopic-tag {
    background: var(--all-topics-color-light);
    color: var(--all-topics-color);
    font-weight: 600;
    border: 1px solid var(--all-topics-color-light);
}

#long-question-screen.rainbow-theme .back-btn {
    color: var(--all-topics-color);
}

#long-question-screen.rainbow-theme .back-btn:hover {
    background: var(--all-topics-color-light);
    color: var(--all-topics-color);
    border-color: var(--all-topics-color);
}

#long-question-screen.rainbow-theme .nav-btn:hover:not(:disabled) {
    border-color: var(--all-topics-color);
}

#long-question-screen.rainbow-theme .progress-fill {
    background: var(--all-topics-color);
}

#long-question-list-screen.rainbow-theme .long-question-list-card {
    border-color: var(--all-topics-color-light);
}

#long-question-list-screen.rainbow-theme .long-question-list-card:hover,
#long-question-list-screen.rainbow-theme .long-question-list-card.current {
    border-color: var(--all-topics-color);
    box-shadow: var(--shadow-lg);
}

#long-question-list-screen.rainbow-theme .marks-value {
    color: var(--all-topics-color);
}

#long-question-list-screen.rainbow-theme .back-btn {
    color: var(--all-topics-color);
}

#long-question-list-screen.rainbow-theme .back-btn:hover {
    background: var(--all-topics-color-light);
    color: var(--all-topics-color);
    border-color: var(--all-topics-color);
}

/* Universal All Topics Theme Styling */
#flashcard-screen.rainbow-theme .card-list-btn:hover,
#question-screen.rainbow-theme .card-list-btn:hover,
#long-question-screen.rainbow-theme .card-list-btn:hover {
    background: var(--all-topics-color-light);
    color: var(--all-topics-color);
    border-color: var(--all-topics-color);
    border-width: 2px;
}

#flashcard-screen.rainbow-theme .card-list-item:hover,
#question-screen.rainbow-theme .card-list-item:hover,
#long-question-screen.rainbow-theme .card-list-item:hover {
    background: var(--all-topics-color-light);
    border-color: var(--all-topics-color);
}

#flashcard-screen.rainbow-theme .card-list-item.current,
#question-screen.rainbow-theme .card-list-item.current,
#long-question-screen.rainbow-theme .card-list-item.current {
    background: var(--all-topics-color-light);
    border-color: var(--all-topics-color);
    box-shadow: 0 0 0 2px var(--all-topics-color-light);
}

#flashcard-screen.rainbow-theme .card-list-item.current .card-list-item-number,
#question-screen.rainbow-theme .card-list-item.current .card-list-item-number,
#long-question-screen.rainbow-theme .card-list-item.current .card-list-item-number {
    background: var(--all-topics-color);
    color: var(--color-surface);
}

#flashcard-screen.rainbow-theme .card-list-item-indicator,
#question-screen.rainbow-theme .card-list-item-indicator,
#long-question-screen.rainbow-theme .card-list-item-indicator {
    background: var(--all-topics-color);
    color: var(--color-surface);
}

/* Results Screen All Topics Theme */
#question-screen.rainbow-theme .stat-value,
#long-question-screen.rainbow-theme .stat-value {
    color: var(--all-topics-color);
}

/* Flashcard hover border */
#flashcard-screen.rainbow-theme .flashcard:hover .flashcard-front,
#flashcard-screen.rainbow-theme .flashcard:hover .flashcard-back {
    border-color: var(--all-topics-color);
}

/* ===========================
   TIME TRIALS STYLES
   =========================== */

/* Time Trials Topic Card Special Styling */
.topic-card.time-trials-card {
    position: relative;
}

.topic-card.time-trials-card h3 {
    justify-content: center;
}

.topic-card.time-trials-card .topic-stats {
    justify-content: center;
}

.topic-card.time-trials-card .stopwatch-icon {
    position: absolute;
    top: 16px;
    right: 16px;
    opacity: 0.8;
    display: flex;
    align-items: center;
    justify-content: center;
}

.topic-card.time-trials-card .stopwatch-icon svg {
    color: var(--topic-color, var(--color-accent));
    transition: all var(--transition-base);
}

.topic-card.time-trials-card:hover .stopwatch-icon svg {
    transform: scale(1.15) rotate(-5deg);
    opacity: 1;
}

/* Time Trials Settings Screen */
#time-trials-settings-screen {
    max-width: 900px;
    margin: 0 auto;
}

.time-trials-settings {
    width: 100%;
}

.setting-section {
    margin-bottom: var(--spacing-3xl);
    background: var(--color-surface);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
}

.setting-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    color: var(--color-text-primary);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--color-border);
}

/* Duration Selection Cards */
.duration-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.duration-card {
    background: var(--color-surface);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-base);
}

.duration-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-accent);
}

.duration-card.selected {
    border-color: var(--color-accent);
    background: var(--color-accent-light);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.duration-value {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    color: var(--color-accent);
    line-height: 1;
    margin-bottom: var(--spacing-xs);
}

.duration-label {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Topic Selection */
.topic-selection-controls {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.topic-control-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    transition: all var(--transition-fast);
}

.topic-control-btn:hover {
    background: var(--color-accent-light);
    color: var(--color-accent);
    border-color: var(--color-accent);
}

.topic-checkboxes {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
}

.topic-checkbox-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
    transition: background var(--transition-fast);
}

.topic-checkbox-item:hover {
    background: var(--color-accent-light);
}

.topic-checkbox-item input[type="checkbox"] {
    width: 20px;
    height: 20px;
    cursor: pointer;
    accent-color: var(--color-accent);
}

.topic-checkbox-item label {
    cursor: pointer;
    font-size: var(--font-size-base);
    color: var(--color-text-primary);
    user-select: none;
}

/* Toggle Switch */
.toggle-container {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
}

.toggle-switch {
    position: relative;
    display: inline-block;
    width: 56px;
    height: 32px;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--color-border);
    transition: var(--transition-base);
    border-radius: var(--radius-full);
}

.toggle-slider:before {
    position: absolute;
    content: "";
    height: 24px;
    width: 24px;
    left: 4px;
    bottom: 4px;
    background-color: white;
    transition: var(--transition-base);
    border-radius: 50%;
}

.toggle-switch input:checked + .toggle-slider {
    background-color: var(--color-accent);
}

.toggle-switch input:checked + .toggle-slider:before {
    transform: translateX(24px);
}

.toggle-label {
    font-size: var(--font-size-base);
    color: var(--color-text-primary);
}

/* Start Button */
.start-button-container {
    text-align: center;
    margin-top: var(--spacing-3xl);
}

.start-btn {
    padding: var(--spacing-lg) var(--spacing-3xl);
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: #81C784;
    background: rgba(129, 199, 132, 0.15);
    border: 3px solid #81C784;
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-base);
    text-transform: uppercase;
    letter-spacing: 2px;
}

.start-btn:hover {
    transform: translateY(-2px) scale(1.05);
    box-shadow: var(--shadow-xl);
    background: rgba(129, 199, 132, 0.25);
}

.start-btn:active {
    transform: translateY(0) scale(1);
    background: rgba(129, 199, 132, 0.35);
}

/* Countdown Screen */
#time-trials-countdown-screen {
    max-width: 100%;
}

.countdown-container {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 80vh;
    animation: fadeIn var(--transition-base) forwards;
}

.countdown-number {
    font-size: 15rem;
    font-weight: 900;
    color: var(--color-accent);
    text-align: center;
    text-shadow: 0 10px 30px rgba(59, 130, 246, 0.3);
    line-height: 1;
    /* Animation is applied via JavaScript for each number */
}

@keyframes countdownPulse {
    0% {
        transform: scale(0.5);
        opacity: 0;
    }
    50% {
        transform: scale(1.2);
    }
    100% {
        transform: scale(1);
        opacity: 1;
    }
}

/* Time Trials Quiz Screen */
#time-trials-quiz-screen {
    max-width: 900px;
    margin: 0 auto;
}

.time-trials-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg) var(--spacing-xl);
    background: var(--color-surface);
    border-bottom: 2px solid var(--color-border);
    margin-bottom: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.timer-display {
    font-size: var(--font-size-4xl);
    font-weight: 800;
    color: var(--color-accent);
    font-variant-numeric: tabular-nums;
    letter-spacing: 2px;
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--color-accent-light);
    border-radius: var(--radius-lg);
    min-width: 140px;
    text-align: center;
}

.timer-display.warning {
    color: var(--color-warning);
    background: var(--color-warning-light);
    animation: timerPulse 1s infinite;
}

.timer-display.danger {
    color: var(--color-error);
    background: var(--color-error-light);
    animation: timerPulse 0.5s infinite;
}

@keyframes timerPulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

.trials-score-display {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-text-primary);
}

.trials-score-display span {
    color: var(--color-accent);
    font-weight: 700;
}

.question-number {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
}

/* Time Trials Results Screen */
#time-trials-results-screen {
    max-width: 900px;
    margin: 0 auto;
}

#time-trials-results-screen .results-stats {
    grid-template-columns: repeat(3, 1fr);
}

#time-trials-results-screen .results-icon svg {
    color: var(--color-accent);
}

/* Responsive Design for Time Trials */
@media (max-width: 768px) {
    .duration-cards {
        grid-template-columns: repeat(2, 1fr);
    }

    .topic-checkboxes {
        grid-template-columns: 1fr;
    }

    .countdown-number {
        font-size: 10rem;
    }

    .time-trials-header {
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
    }

    .timer-display {
        font-size: var(--font-size-3xl);
    }

    .start-btn {
        font-size: var(--font-size-xl);
        padding: var(--spacing-md) var(--spacing-2xl);
    }

    #time-trials-results-screen .results-stats {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .countdown-number {
        font-size: 8rem;
    }

    .duration-cards {
        grid-template-columns: 1fr;
    }

    .timer-display {
        font-size: var(--font-size-2xl);
    }

    .trials-score-display {
        font-size: var(--font-size-sm);
    }
}

/* ===========================
   DARK MODE TOGGLE BUTTON
   =========================== */
.dark-mode-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1000;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--color-surface);
    border: 2px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-md);
    padding: 0;
}

.dark-mode-toggle:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-accent);
}

.dark-mode-toggle:active {
    transform: scale(1.05);
}

.dark-mode-toggle svg {
    width: 24px;
    height: 24px;
    color: var(--color-text-primary);
    transition: all var(--transition-base);
}

.dark-mode-toggle:hover svg {
    color: var(--color-accent);
}

/* Icon visibility based on theme */
.dark-mode-toggle .sun-icon {
    display: none;
}

.dark-mode-toggle .moon-icon {
    display: block;
}

[data-theme="dark"] .dark-mode-toggle .sun-icon {
    display: block;
}

[data-theme="dark"] .dark-mode-toggle .moon-icon {
    display: none;
}

/* Responsive positioning */
@media (max-width: 640px) {
    .dark-mode-toggle {
        top: 12px;
        right: 12px;
        width: 44px;
        height: 44px;
    }

    .dark-mode-toggle svg {
        width: 20px;
        height: 20px;
    }
}

/* Header area - no extra padding needed since dark mode toggle removed */

/* ===========================
   CARD LIST OVERLAY
   =========================== */
.card-list-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(250, 250, 250, 0.8);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-base), visibility var(--transition-base);
    padding: var(--spacing-lg);
}

[data-theme="dark"] .card-list-overlay {
    background: rgba(26, 26, 26, 0.8);
}

.card-list-overlay.visible {
    opacity: 1;
    visibility: visible;
}

.card-list-container {
    background: var(--color-surface);
    border-radius: var(--radius-xl);
    width: 100%;
    max-width: 90vw;
    max-height: 85vh;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-xl);
    transform: scale(0.95);
    transition: transform var(--transition-base);
}

.card-list-overlay.visible .card-list-container {
    transform: scale(1);
}

.card-list-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
}

.card-list-header h3 {
    margin: 0;
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-text-primary);
}

.close-card-list-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.close-card-list-btn:hover {
    background: var(--color-bg-elevated);
    color: var(--color-text-primary);
}

.card-list-content {
    overflow-y: auto;
    padding: var(--spacing-lg);
    flex: 1;
    column-count: 2;
    column-gap: var(--spacing-lg);
}

.card-list-group {
    break-inside: avoid;
    margin-bottom: var(--spacing-lg);
    display: inline-block;
    width: 100%;
}

.card-list-group-header {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-sm);
    padding: 0 var(--spacing-sm);
}

.card-list-items {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.card-list-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.card-list-item:hover {
    background: var(--color-accent-light);
    border-color: var(--color-accent);
    transform: translateX(4px);
}

.card-list-item.current {
    background: var(--color-accent-light);
    border-color: var(--color-accent);
    box-shadow: 0 0 0 2px var(--color-accent-light);
}

.card-list-item-number {
    flex-shrink: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-surface);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text-secondary);
}

.card-list-item.current .card-list-item-number {
    background: var(--color-accent);
    color: white;
}

.card-list-item-text {
    flex: 1;
    font-size: var(--font-size-sm);
    color: var(--color-text-primary);
    line-height: 1.4;
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
}

.card-list-item-indicator {
    flex-shrink: 0;
    padding: 2px 8px;
    background: var(--color-accent);
    color: white;
    border-radius: var(--radius-full);
    font-size: 10px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Responsive */
@media (max-width: 1024px) {
    .card-list-content {
        column-count: 1;
    }
}

@media (max-width: 768px) {
    .card-list-overlay {
        padding: 0;
    }

    .card-list-container {
        max-width: 100%;
        max-height: 100vh;
        border-radius: 0;
    }

    .card-list-content {
        padding: var(--spacing-md);
        column-count: 1;
    }
}