/* -------------------------------------------------------------
   Design System & Variable Tokens
------------------------------------------------------------- */
:root {
    /* Global Layout & Dimensions */
    --border-radius-lg: 16px;
    --border-radius-md: 12px;
    --border-radius-sm: 8px;
    --header-height: 64px;
    --footer-height: 72px;
    --sidebar-width: 280px;
    --transition-speed: 0.3s;
}

/* Default Ocean Blue Theme (Light) */
:root, body[data-theme="ocean"] {
    --primary-h: 210;
    --primary-s: 100%;
    --primary-l: 50%;
    
    --primary: hsl(var(--primary-h), var(--primary-s), var(--primary-l));
    --primary-container: hsl(var(--primary-h), var(--primary-s), 95%);
    --on-primary-container: hsl(var(--primary-h), var(--primary-s), 20%);
    
    --secondary: hsl(200, 15%, 40%);
    --surface-variant: hsl(200, 12%, 94%);
    --on-surface-variant: hsl(200, 12%, 30%);
    
    --background: hsl(210, 20%, 98%);
    --surface: hsl(0, 0%, 100%);
    --on-background: #1c1b1f;
    --on-surface: #1c1b1f;
    --outline: hsl(200, 8%, 85%);
    
    --success: #4caf50;
    --danger: #e53935;
    --warning: #ffb300;
    
    --primary-gradient: linear-gradient(135deg, hsl(210, 100%, 50%), hsl(225, 100%, 60%));
    --card-shadow: 0 4px 20px rgba(0, 0, 0, 0.04);
    --hover-shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
}

/* Deep Charcoal (Dark Mode) */
body[data-theme="charcoal"] {
    --primary-h: 210;
    --primary-s: 100%;
    --primary-l: 60%;
    
    --primary: hsl(var(--primary-h), var(--primary-s), var(--primary-l));
    --primary-container: hsl(var(--primary-h), var(--primary-s), 18%);
    --on-primary-container: hsl(var(--primary-h), var(--primary-s), 90%);
    
    --secondary: hsl(210, 10%, 65%);
    --surface-variant: hsl(210, 14%, 20%);
    --on-surface-variant: hsl(210, 10%, 75%);
    
    --background: hsl(210, 18%, 10%);
    --surface: hsl(210, 14%, 13%);
    --on-background: #f1f2f4;
    --on-surface: #f1f2f4;
    --outline: hsl(210, 12%, 24%);
    
    --success: #66bb6a;
    --danger: #ef5350;
    --warning: #ffca28;
    
    --primary-gradient: linear-gradient(135deg, hsl(210, 100%, 60%), hsl(225, 100%, 70%));
    --card-shadow: 0 4px 20px rgba(0, 0, 0, 0.25);
    --hover-shadow: 0 8px 30px rgba(0, 0, 0, 0.45);
}

/* Forest Emerald (Greenish Light) */
body[data-theme="emerald"] {
    --primary-h: 150;
    --primary-s: 80%;
    --primary-l: 36%;
    
    --primary: hsl(var(--primary-h), var(--primary-s), var(--primary-l));
    --primary-container: hsl(var(--primary-h), var(--primary-s), 94%);
    --on-primary-container: hsl(var(--primary-h), var(--primary-s), 15%);
    
    --secondary: hsl(150, 10%, 40%);
    --surface-variant: hsl(150, 8%, 93%);
    --on-surface-variant: hsl(150, 8%, 30%);
    
    --background: hsl(150, 15%, 97%);
    --surface: hsl(0, 0%, 100%);
    --on-background: #142217;
    --on-surface: #142217;
    --outline: hsl(150, 8%, 85%);
    
    --success: #4caf50;
    --danger: #e53935;
    --warning: #ffb300;
    
    --primary-gradient: linear-gradient(135deg, hsl(150, 80%, 36%), hsl(165, 80%, 45%));
    --card-shadow: 0 4px 20px rgba(0, 0, 0, 0.04);
    --hover-shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
}

/* Sunset Copper (Warm Amber Light) */
body[data-theme="sunset"] {
    --primary-h: 22;
    --primary-s: 90%;
    --primary-l: 48%;
    
    --primary: hsl(var(--primary-h), var(--primary-s), var(--primary-l));
    --primary-container: hsl(var(--primary-h), var(--primary-s), 95%);
    --on-primary-container: hsl(var(--primary-h), var(--primary-s), 18%);
    
    --secondary: hsl(22, 12%, 42%);
    --surface-variant: hsl(22, 10%, 94%);
    --on-surface-variant: hsl(22, 10%, 30%);
    
    --background: hsl(22, 15%, 98%);
    --surface: hsl(0, 0%, 100%);
    --on-background: #24140b;
    --on-surface: #24140b;
    --outline: hsl(22, 8%, 86%);
    
    --success: #4caf50;
    --danger: #e53935;
    --warning: #ffb300;
    
    --primary-gradient: linear-gradient(135deg, hsl(22, 90%, 48%), hsl(35, 90%, 55%));
    --card-shadow: 0 4px 20px rgba(0, 0, 0, 0.04);
    --hover-shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
}

/* -------------------------------------------------------------
   Base Styles & Reset
------------------------------------------------------------- */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    -webkit-tap-highlight-color: transparent;
}

body {
    background-color: var(--background);
    color: var(--on-background);
    overflow: hidden;
    height: 100vh;
    width: 100vw;
}

#app {
    display: flex;
    height: 100%;
    width: 100%;
}

/* -------------------------------------------------------------
   Sidebar Navigation Drawer
------------------------------------------------------------- */
.sidebar {
    width: var(--sidebar-width);
    background-color: var(--surface);
    border-right: 1px solid var(--outline);
    display: flex;
    flex-direction: column;
    z-index: 100;
    transition: transform var(--transition-speed) ease;
}

.sidebar-header {
    height: var(--header-height);
    display: flex;
    align-items: center;
    padding: 0 20px;
    gap: 12px;
    border-bottom: 1px solid var(--outline);
    position: relative;
}

.logo-box {
    width: 36px;
    height: 36px;
    background-color: var(--primary-container);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--border-radius-sm);
    font-size: 20px;
}

.sidebar-header h3 {
    font-size: 16px;
    font-weight: 700;
    color: var(--on-surface);
}

.sidebar-header span {
    font-size: 11px;
    color: var(--secondary);
    display: block;
    margin-top: -2px;
}

.close-btn {
    background: none;
    border: none;
    font-size: 18px;
    color: var(--secondary);
    cursor: pointer;
    position: absolute;
    right: 20px;
    display: none; /* Only visible on mobile */
}

.sidebar-nav {
    display: flex;
    flex-direction: column;
    padding: 20px 12px;
    gap: 6px;
    flex: 1;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    border-radius: var(--border-radius-sm);
    color: var(--on-surface-variant);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: background-color 0.2s, color 0.2s;
}

.nav-item i {
    font-size: 16px;
    width: 20px;
    text-align: center;
}

.nav-item:hover {
    background-color: var(--surface-variant);
    color: var(--on-surface);
}

.nav-item.active {
    background-color: var(--primary-container);
    color: var(--primary);
    font-weight: 600;
}

/* -------------------------------------------------------------
   Main Wrapper Content
------------------------------------------------------------- */
.main-wrapper {
    flex: 1;
    display: flex;
    flex-direction: column;
    height: 100%;
    position: relative;
    overflow: hidden;
}

/* Header */
.app-header {
    height: var(--header-height);
    background-color: var(--surface);
    border-bottom: 1px solid var(--outline);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
}

.header-icon-btn {
    background: none;
    border: none;
    font-size: 20px;
    color: var(--on-surface);
    cursor: pointer;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: background-color 0.2s;
}

.header-icon-btn:hover {
    background-color: var(--surface-variant);
}

.app-header h1 {
    font-size: 18px;
    font-weight: 700;
    color: var(--on-surface);
}

.header-profile-btn {
    background: none;
    border: none;
    font-size: 28px;
    color: var(--secondary);
    cursor: pointer;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: color 0.2s;
}

.header-profile-btn:hover {
    color: var(--primary);
}

/* Content Screen Containers */
.content-container {
    flex: 1;
    overflow-y: auto;
    background-color: var(--background);
    padding-bottom: var(--footer-height); /* Keep space for sticky footer */
    position: relative;
}

.app-screen {
    display: none;
    padding: 20px;
    flex-direction: column;
    gap: 20px;
    min-height: 100%;
}

.app-screen.active {
    display: flex;
}

.app-screen.no-padding {
    padding: 0;
}

.app-screen.black-bg {
    background-color: #000;
}

/* -------------------------------------------------------------
   Sticky Footer Navigation
------------------------------------------------------------- */
.app-footer {
    height: var(--footer-height);
    background-color: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-top: 1px solid var(--outline);
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    display: flex;
    align-items: center;
    justify-content: space-around;
    z-index: 50;
    padding: 0 10px;
}

.footer-nav-item {
    background: none;
    border: none;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
    color: var(--on-surface-variant);
    cursor: pointer;
    flex: 1;
    height: 100%;
    transition: color 0.2s;
}

.footer-nav-item i {
    font-size: 18px;
}

.footer-nav-item span {
    font-size: 11px;
    font-weight: 500;
}

.footer-nav-item.active {
    color: var(--primary);
}

/* -------------------------------------------------------------
   Component Blocks: Cards, Buttons, List Items
------------------------------------------------------------- */

/* Welcome Stats Card */
.stats-banner-card {
    background-color: var(--primary-container);
    border-radius: var(--border-radius-lg);
    padding: 20px;
    color: var(--on-primary-container);
    display: flex;
    flex-direction: column;
    gap: 16px;
    box-shadow: var(--card-shadow);
}

.banner-welcome span {
    font-size: 14px;
    opacity: 0.8;
}

.banner-welcome h2 {
    font-size: 24px;
    font-weight: 800;
}

.divider {
    height: 1px;
    background-color: var(--primary);
    opacity: 0.15;
}

.banner-stats {
    display: flex;
    justify-content: space-between;
}

.stat-box {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.stat-box.align-end {
    align-items: flex-end;
}

.stat-label {
    font-size: 12px;
    opacity: 0.8;
}

.stat-value {
    font-size: 20px;
    font-weight: 700;
}

/* Row Scroll Lists (Carousels) */
.horizontal-scroll {
    display: flex;
    gap: 12px;
    overflow-x: auto;
    padding-bottom: 8px;
    scroll-behavior: smooth;
    -ms-overflow-style: none;  /* IE and Edge */
    scrollbar-width: none;  /* Firefox */
}

.horizontal-scroll::-webkit-scrollbar {
    display: none; /* Chrome, Safari, Opera */
}

.screen-section {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.screen-section h3 {
    font-size: 18px;
    font-weight: 700;
    color: var(--on-background);
}

.view-all-btn {
    background: none;
    border: none;
    color: var(--primary);
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
}

/* Exam Card (Carousel Item) */
.exam-carousel-card {
    min-width: 110px;
    width: 110px;
    height: 100px;
    background-color: var(--surface-variant);
    border-radius: var(--border-radius-md);
    padding: 12px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
    cursor: pointer;
    transition: transform 0.2s, background-color 0.2s;
}

.exam-carousel-card:hover {
    transform: translateY(-2px);
    background-color: var(--outline);
}

.exam-icon-circle {
    width: 36px;
    height: 36px;
    background-color: rgba(255, 255, 255, 0.6);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    font-size: 16px;
}

.exam-carousel-card h4 {
    font-size: 12px;
    font-weight: 600;
    color: var(--on-surface-variant);
}

/* News Update Card (Carousel Item) */
.news-update-card {
    min-width: 260px;
    width: 260px;
    height: 140px;
    background-color: var(--surface);
    border: 1px solid var(--outline);
    border-radius: var(--border-radius-md);
    padding: 14px;
    display: flex;
    flex-direction: column;
    gap: 6px;
    box-shadow: var(--card-shadow);
}

.news-header {
    display: flex;
    justify-content: space-between;
    font-size: 10px;
    font-weight: 700;
}

.news-tag {
    color: var(--primary);
}

.news-date {
    color: var(--secondary);
    opacity: 0.6;
}

.news-update-card h4 {
    font-size: 14px;
    font-weight: 700;
    color: var(--on-surface);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.news-update-card p {
    font-size: 12px;
    line-height: 16px;
    color: var(--on-surface-variant);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* Subject Chips */
.subject-chip {
    padding: 8px 16px;
    background-color: var(--surface);
    border: 1px solid var(--outline);
    border-radius: 20px;
    font-size: 13px;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    white-space: nowrap;
    transition: background-color 0.2s, border-color 0.2s;
}

.subject-chip i {
    font-size: 12px;
    color: var(--secondary);
}

.subject-chip:hover {
    background-color: var(--surface-variant);
}

.subject-chip.active {
    background-color: var(--primary-container);
    border-color: var(--primary);
    color: var(--primary);
}

.subject-chip.active i {
    color: var(--primary);
}

/* Simple Test Series Promo Card */
.simple-promo-card {
    height: 64px;
    padding: 0 16px;
    background-color: var(--primary-container);
    color: var(--on-primary-container);
    border-radius: var(--border-radius-md);
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-weight: 700;
    font-size: 15px;
    cursor: pointer;
    box-shadow: var(--card-shadow);
    transition: transform 0.2s, background-color 0.2s;
}

.simple-promo-card:hover {
    transform: translateY(-1px);
    background-color: hsl(var(--primary-h), var(--primary-s), 92%);
}

.simple-promo-card i {
    font-size: 16px;
    color: var(--primary);
}

/* Grid with 2 columns */
.grid-two-columns {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px; /* minimal margins */
    width: 100%;
}

.compact-rect-item {
    display: flex;
    align-items: center;
    height: 52px;
    padding: 6px 12px;
    background-color: var(--surface-variant);
    border-radius: var(--border-radius-md);
    gap: 10px;
    cursor: pointer;
    transition: background-color 0.2s, transform 0.1s;
}

.compact-rect-item:hover {
    background-color: var(--outline);
}

.compact-rect-item:active {
    transform: scale(0.99);
}

.rect-icon-box {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.7);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
}

.compact-rect-item.pdf-note-subject .rect-icon-box {
    color: var(--secondary);
    background-color: rgba(255, 255, 255, 0.7);
}

.rect-text-box {
    display: flex;
    flex-direction: column;
    justify-content: center;
    overflow: hidden;
    flex: 1;
}

.rect-text-box h4 {
    font-size: 14px;
    font-weight: 700;
    color: var(--on-surface-variant);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.rect-text-box span {
    font-size: 11px;
    color: var(--secondary);
    opacity: 0.7;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* -------------------------------------------------------------
   Exams Screen List
------------------------------------------------------------- */
.search-bar-wrapper {
    display: flex;
    align-items: center;
    background-color: var(--surface);
    border: 1px solid var(--outline);
    border-radius: var(--border-radius-md);
    padding: 0 16px;
    height: 48px;
    gap: 12px;
    box-shadow: var(--card-shadow);
}

.search-bar-wrapper i {
    color: var(--secondary);
    font-size: 16px;
}

.search-bar-wrapper input {
    border: none;
    background: none;
    outline: none;
    flex: 1;
    font-size: 14px;
    color: var(--on-surface);
}

/* -------------------------------------------------------------
   PDF Notes Library List
------------------------------------------------------------- */
.filter-chips-row {
    display: flex;
    gap: 8px;
    padding: 4px 0 12px 0;
}

.notes-list-container {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.note-item-card {
    background-color: var(--surface);
    border: 1px solid var(--outline);
    border-radius: var(--border-radius-md);
    padding: 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--card-shadow);
}

.note-info {
    display: flex;
    flex-direction: column;
    gap: 6px;
    flex: 1;
}

.note-info h4 {
    font-size: 15px;
    font-weight: 700;
    color: var(--on-surface);
}

.note-metadata {
    display: flex;
    align-items: center;
    gap: 8px;
}

.note-tag {
    font-size: 10px;
    font-weight: 700;
    background-color: var(--surface-variant);
    color: var(--on-surface-variant);
    padding: 2px 8px;
    border-radius: 4px;
}

.note-size {
    font-size: 12px;
    color: var(--secondary);
    opacity: 0.7;
}

.btn-download-note {
    width: 40px;
    height: 40px;
    background-color: var(--primary-container);
    color: var(--primary);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    transition: background-color 0.2s, color 0.2s;
}

.btn-download-note:hover {
    background-color: var(--primary);
    color: #fff;
}

.btn-view-note {
    padding: 8px 16px;
    background-color: var(--primary);
    color: #fff;
    border: none;
    border-radius: var(--border-radius-sm);
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
}

.btn-view-note:hover {
    opacity: 0.9;
}

/* -------------------------------------------------------------
   Test Series Screens
------------------------------------------------------------- */
.test-series-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.test-series-card {
    background-color: var(--surface);
    border: 1px solid var(--outline);
    border-radius: var(--border-radius-lg);
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    cursor: pointer;
    box-shadow: var(--card-shadow);
}

.ts-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.exam-badge {
    background-color: var(--primary-container);
    color: var(--primary);
    font-size: 10px;
    font-weight: 700;
    padding: 4px 8px;
    border-radius: 4px;
}

.test-count-badge {
    background-color: var(--surface-variant);
    color: var(--on-surface-variant);
    font-size: 11px;
    font-weight: 700;
    padding: 4px 8px;
    border-radius: 4px;
}

.test-series-card h3 {
    font-size: 17px;
    font-weight: 700;
    color: var(--on-surface);
}

.test-series-card p {
    font-size: 13px;
    color: var(--on-surface-variant);
    line-height: 18px;
}

.ts-action-link {
    display: flex;
    justify-content: flex-end;
    align-items: center;
    gap: 4px;
    color: var(--primary);
    font-size: 13px;
    font-weight: 700;
}

/* Test Series Details Screen */
.back-navigation {
    margin-bottom: 8px;
}

.back-btn {
    background: none;
    border: none;
    color: var(--secondary);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
}

.series-description {
    font-size: 14px;
    color: var(--on-surface-variant);
    line-height: 20px;
    margin-bottom: 16px;
}

.tests-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.individual-test-card {
    background-color: var(--surface);
    border: 1px solid var(--outline);
    border-radius: var(--border-radius-md);
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    box-shadow: var(--card-shadow);
}

.individual-test-card h4 {
    font-size: 15px;
    font-weight: 700;
    color: var(--on-surface);
}

.test-stats-row {
    display: flex;
    gap: 16px;
    font-size: 13px;
    color: var(--secondary);
}

.test-divider {
    height: 1px;
    background-color: var(--outline);
}

.test-actions-row {
    display: flex;
    gap: 12px;
}

.btn-attempt-omr {
    flex: 1;
    height: 40px;
    background: none;
    border: 1px solid var(--primary);
    color: var(--primary);
    border-radius: var(--border-radius-sm);
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

.btn-attempt-online {
    flex: 1;
    height: 40px;
    background-color: var(--primary);
    border: none;
    color: #fff;
    border-radius: var(--border-radius-sm);
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

.btn-attempt-omr:hover {
    background-color: var(--primary-container);
}

.btn-attempt-online:hover {
    opacity: 0.9;
}

/* -------------------------------------------------------------
   Online Test Player Screen
------------------------------------------------------------- */
.player-header {
    height: 60px;
    background-color: var(--surface);
    border-bottom: 1px solid var(--outline);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 16px;
}

.player-title-box h3 {
    font-size: 14px;
    font-weight: 700;
    color: var(--on-surface);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 200px;
}

.player-timer {
    font-size: 12px;
    font-weight: 600;
    color: var(--primary);
    margin-top: 2px;
    display: block;
}

.player-timer.red {
    color: var(--danger);
    animation: flash 1s infinite alternate;
}

@keyframes flash {
    from { opacity: 1; }
    to { opacity: 0.4; }
}

.palette-toggle-btn {
    padding: 6px 12px;
    background-color: var(--surface-variant);
    border: none;
    border-radius: var(--border-radius-sm);
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
}

.player-body {
    padding: 16px;
    overflow-y: auto;
    height: calc(100% - 120px);
}

.question-container {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.question-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.question-header h3 {
    font-size: 16px;
    font-weight: 700;
}

.mark-review-label {
    font-size: 12px;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 6px;
    cursor: pointer;
}

.question-card {
    background-color: var(--surface);
    border: 1px solid var(--outline);
    border-radius: var(--border-radius-md);
    padding: 16px;
    box-shadow: var(--card-shadow);
}

.question-card p {
    font-size: 15px;
    line-height: 22px;
    color: var(--on-surface);
}

.options-container {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.option-card {
    background-color: var(--surface);
    border: 1px solid var(--outline);
    border-radius: var(--border-radius-md);
    padding: 14px;
    display: flex;
    align-items: center;
    gap: 12px;
    cursor: pointer;
    transition: background-color 0.2s, border-color 0.2s;
}

.option-card:hover {
    background-color: var(--surface-variant);
}

.option-circle {
    width: 28px;
    height: 28px;
    background-color: var(--surface-variant);
    color: var(--on-surface);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    font-size: 13px;
    font-weight: 700;
}

.option-text {
    font-size: 14px;
    color: var(--on-surface);
}

.option-card.selected {
    background-color: var(--primary-container);
    border-color: var(--primary);
}

.option-card.selected .option-circle {
    background-color: var(--primary);
    color: #fff;
}

/* Player Footer */
.player-footer {
    height: 60px;
    background-color: var(--surface-variant);
    border-top: 1px solid var(--outline);
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 16px;
    z-index: 40;
}

.player-footer .nav-btn {
    padding: 8px 16px;
    background: none;
    border: none;
    color: var(--primary);
    font-size: 13px;
    font-weight: 700;
    cursor: pointer;
}

.player-footer .nav-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.player-footer .submit-btn {
    padding: 8px 24px;
    background-color: var(--danger);
    color: #fff;
    border: none;
    border-radius: var(--border-radius-sm);
    font-size: 13px;
    font-weight: 700;
    cursor: pointer;
}

/* -------------------------------------------------------------
   OMR Prep Screen
------------------------------------------------------------- */
.instructions-card {
    background-color: var(--surface);
    border: 1px solid var(--outline);
    border-radius: var(--border-radius-lg);
    padding: 20px;
    box-shadow: var(--card-shadow);
}

.instructions-card h4 {
    font-size: 15px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 12px;
}

.steps-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.steps-list li {
    display: flex;
    gap: 12px;
    font-size: 13px;
    line-height: 18px;
}

.step-num {
    min-width: 24px;
    width: 24px;
    height: 24px;
    background-color: var(--primary-container);
    color: var(--primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: 700;
}

.downloads-section {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.download-row {
    background-color: var(--surface-variant);
    border-radius: var(--border-radius-md);
    padding: 12px 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.download-info {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 14px;
    font-weight: 500;
}

.download-info i {
    color: var(--primary);
    font-size: 18px;
}

.btn-download {
    background: none;
    border: none;
    font-size: 16px;
    color: var(--secondary);
    cursor: pointer;
}

.primary-action-btn {
    width: 100%;
    height: 50px;
    background-color: var(--primary);
    color: #fff;
    border: none;
    border-radius: var(--border-radius-md);
    font-size: 15px;
    font-weight: 700;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    box-shadow: 0 4px 15px rgba(0, 122, 255, 0.15);
}

.primary-action-btn:hover {
    opacity: 0.95;
}

/* -------------------------------------------------------------
   OMR Camera Scanner Screen
------------------------------------------------------------- */
.scanner-header {
    height: 60px;
    background-color: rgba(0, 0, 0, 0.5);
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 16px;
    z-index: 90;
}

.scanner-header h3 {
    color: #fff;
    font-size: 16px;
    font-weight: 700;
}

.scanner-icon-btn {
    background: none;
    border: none;
    color: #fff;
    font-size: 20px;
    cursor: pointer;
}

.camera-viewport-container {
    width: 100%;
    height: calc(100vh - 180px);
    position: relative;
    overflow: hidden;
    background-color: #000;
    display: flex;
    align-items: center;
    justify-content: center;
}

#webcam-feed {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.scanner-overlay {
    position: absolute;
    width: 80%;
    max-width: 320px;
    aspect-ratio: 0.7;
    border: 2px dashed rgba(255, 255, 255, 0.5);
    border-radius: var(--border-radius-lg);
    box-sizing: border-box;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
}

/* Guides */
.guide-corner {
    position: absolute;
    width: 20px;
    height: 20px;
    border-color: #fff;
    border-style: solid;
    transition: border-color var(--transition-speed);
}

.guide-corner.top-left { top: -2px; left: -2px; border-width: 3px 0 0 3px; }
.guide-corner.top-right { top: -2px; right: -2px; border-width: 3px 3px 0 0; }
.guide-corner.bottom-left { bottom: -2px; left: -2px; border-width: 0 0 3px 3px; }
.guide-corner.bottom-right { bottom: -2px; right: -2px; border-width: 0 3px 3px 0; }

.scanner-overlay.active {
    border-color: var(--success);
}

.scanner-overlay.active .guide-corner {
    border-color: var(--success);
}

.scanner-laser {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background-color: var(--success);
    opacity: 0.8;
    z-index: 12;
    animation: scanAnimation 2s infinite linear;
    display: none;
}

@keyframes scanAnimation {
    0% { top: 0%; }
    50% { top: 100%; }
    100% { top: 0%; }
}

.scanner-overlay.active .scanner-laser {
    display: block;
}

.align-helper-text {
    position: absolute;
    bottom: -32px;
    color: rgba(255, 255, 255, 0.8);
    font-size: 13px;
    font-weight: 500;
    text-align: center;
    width: 100%;
}

.scanner-footer {
    height: 120px;
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background-color: rgba(0, 0, 0, 0.8);
    padding: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 80;
}

.status-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
    gap: 12px;
}

.status-card span {
    color: #fff;
    font-size: 14px;
    font-weight: 500;
}

.scan-progress-bar {
    width: 100%;
    height: 4px;
    background-color: rgba(255, 255, 255, 0.2);
    border-radius: 2px;
    overflow: hidden;
    display: none;
}

.progress-fill {
    height: 100%;
    width: 0%;
    background-color: var(--success);
    transition: width 0.1s linear;
}

.scan-action-btn {
    width: 100%;
    height: 44px;
    background-color: var(--success);
    color: #000;
    border: none;
    border-radius: var(--border-radius-sm);
    font-size: 14px;
    font-weight: 700;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

/* -------------------------------------------------------------
   Scorecard Result Screen
------------------------------------------------------------- */
.scorecard-hero {
    background-color: var(--primary-container);
    border-radius: var(--border-radius-lg);
    padding: 24px;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    box-shadow: var(--card-shadow);
}

.scorecard-hero h3 {
    font-size: 16px;
    font-weight: 700;
    color: var(--on-primary-container);
}

.score-label {
    font-size: 12px;
    color: var(--on-primary-container);
    opacity: 0.7;
    margin-top: 8px;
}

.score-display {
    font-size: 40px;
    font-weight: 900;
    color: var(--on-primary-container);
}

.percentage-display {
    font-size: 14px;
    font-weight: 600;
    color: var(--on-primary-container);
}

.mode-badge {
    margin-top: 10px;
    font-size: 11px;
    font-weight: 700;
    background-color: rgba(0, 122, 255, 0.15);
    color: var(--primary);
    padding: 4px 10px;
    border-radius: 20px;
}

.score-breakdown-card {
    background-color: var(--surface);
    border: 1px solid var(--outline);
    border-radius: var(--border-radius-md);
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    box-shadow: var(--card-shadow);
}

.score-breakdown-card h4 {
    font-size: 15px;
    font-weight: 700;
}

.breakdown-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 14px;
}

.breakdown-row span {
    display: flex;
    align-items: center;
    gap: 8px;
}

.breakdown-divider {
    height: 1px;
    background-color: var(--outline);
}

.text-success { color: var(--success); }
.text-danger { color: var(--danger); }
.text-muted { color: var(--secondary); opacity: 0.7; }

.section-center-title {
    text-align: center;
    font-size: 20px;
    font-weight: 800;
}

.metadata-row {
    text-align: center;
    font-size: 12px;
    color: var(--secondary);
    opacity: 0.6;
}

/* -------------------------------------------------------------
   Profile & History Screen
------------------------------------------------------------- */
.profile-bio-card {
    background-color: var(--surface);
    border: 1px solid var(--outline);
    border-radius: var(--border-radius-lg);
    padding: 16px;
    display: flex;
    align-items: center;
    gap: 16px;
    box-shadow: var(--card-shadow);
}

.avatar-box {
    width: 56px;
    height: 56px;
    background-color: var(--primary);
    color: #fff;
    font-size: 20px;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
}

.bio-details h3 {
    font-size: 18px;
    font-weight: 700;
    color: var(--on-surface);
}

.bio-details span {
    font-size: 13px;
    color: var(--secondary);
    opacity: 0.8;
}

.profile-stats-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.profile-stat-card {
    background-color: var(--surface-variant);
    border-radius: var(--border-radius-md);
    padding: 16px;
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.profile-stat-card span {
    font-size: 12px;
    color: var(--on-surface-variant);
}

.profile-stat-card h2 {
    font-size: 22px;
    font-weight: 800;
    color: var(--on-background);
}

.history-section {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.history-section h3 {
    font-size: 16px;
    font-weight: 700;
}

.history-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.history-item-card {
    background-color: var(--surface);
    border: 1px solid var(--outline);
    border-radius: var(--border-radius-md);
    padding: 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    box-shadow: var(--card-shadow);
}

.history-info {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.history-info h4 {
    font-size: 14px;
    font-weight: 700;
    color: var(--on-surface);
}

.history-metadata {
    display: flex;
    align-items: center;
    gap: 8px;
}

.history-date {
    font-size: 12px;
    color: var(--secondary);
    opacity: 0.6;
}

.mode-tag {
    font-size: 9px;
    font-weight: 700;
    padding: 2px 6px;
    border-radius: 4px;
}

.mode-tag.omr {
    background-color: rgba(156, 39, 176, 0.1);
    color: #9c27b0;
}

.mode-tag.online {
    background-color: rgba(0, 150, 136, 0.1);
    color: #009688;
}

.history-score-box {
    text-align: right;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.history-score {
    font-size: 16px;
    font-weight: 800;
    color: var(--primary);
}

.history-score-box span {
    font-size: 10px;
    font-weight: 600;
    color: var(--primary);
}

/* -------------------------------------------------------------
   Modal Component Overlays
------------------------------------------------------------- */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.4);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 200;
    padding: 16px;
}

.modal-overlay.active {
    display: flex;
}

.modal-content {
    background-color: var(--surface);
    border-radius: var(--border-radius-lg);
    width: 100%;
    max-width: 440px;
    display: flex;
    flex-direction: column;
    max-height: 80vh;
    box-shadow: 0 10px 40px rgba(0,0,0,0.15);
    overflow: hidden;
}

.modal-header {
    height: 56px;
    border-bottom: 1px solid var(--outline);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
}

.modal-header h4 {
    font-size: 15px;
    font-weight: 700;
    color: var(--on-surface);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 320px;
}

.close-icon-btn {
    background: none;
    border: none;
    font-size: 18px;
    color: var(--secondary);
    cursor: pointer;
}

.modal-body {
    padding: 20px;
    overflow-y: auto;
    flex: 1;
}

/* PDF Viewer Specifics */
.pdf-canvas-container {
    background-color: #88888844;
    padding: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.pdf-page-mock {
    background-color: #fff;
    width: 100%;
    height: 100%;
    border-radius: 4px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.08);
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.pdf-page-mock h3 {
    font-size: 16px;
    font-weight: 700;
    color: #000;
}

.pdf-line-divider {
    height: 1px;
    background-color: #eee;
}

.pdf-page-mock p {
    font-size: 12px;
    line-height: 18px;
    color: #333;
}

.modal-footer {
    height: 56px;
    border-top: 1px solid var(--outline);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
}

.pdf-nav-btn {
    background: none;
    border: none;
    font-size: 16px;
    color: var(--primary);
    cursor: pointer;
}

.pdf-nav-btn:disabled {
    opacity: 0.3;
}

#pdf-page-indicator {
    font-size: 13px;
    font-weight: 600;
}

/* Question Palette Specifics */
.palette-content {
    max-height: 60vh;
}

.palette-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 10px;
    margin-bottom: 20px;
}

.palette-circle {
    aspect-ratio: 1f;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 14px;
    cursor: pointer;
    background-color: var(--surface-variant);
    color: var(--on-surface-variant);
    transition: background-color 0.2s, color 0.2s;
}

.palette-circle.green {
    background-color: var(--success);
    color: #fff;
}

.palette-circle.magenta {
    background-color: #e040fb;
    color: #fff;
}

.palette-circle.gray {
    background-color: var(--surface-variant);
    color: var(--on-surface-variant);
}

.palette-legend {
    display: flex;
    justify-content: space-around;
    font-size: 12px;
    font-weight: 500;
    margin-top: 8px;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 6px;
}

.circle-legend {
    width: 14px;
    height: 14px;
    border-radius: 50%;
    display: inline-block;
}

.circle-legend.green { background-color: var(--success); }
.circle-legend.magenta { background-color: #e040fb; }
.circle-legend.gray { background-color: var(--surface-variant); }

/* -------------------------------------------------------------
   Responsive Breakpoints & Adjustments
------------------------------------------------------------- */
@media (max-width: 768px) {
    /* Side navigation is drawer on mobile, starts hidden offscreen */
    .sidebar {
        position: fixed;
        top: 0;
        bottom: 0;
        left: 0;
        transform: translateX(-100%);
    }
    
    .sidebar.active {
        transform: translateX(0);
    }
    
    .close-btn {
        display: block;
    }
    
    .exams-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 769px) {
    /* Hide sticky footer on large desktop screens */
    .app-footer {
        display: none;
    }
    
    .content-container {
        padding-bottom: 20px;
    }
    
    .header-icon-btn#hamburger-btn {
        display: none;
    }
}

/* -------------------------------------------------------------
   Theme Selector Widget (Sidebar Bottom)
------------------------------------------------------------- */
.sidebar-theme-selector {
    padding: 16px 20px;
    border-top: 1px solid var(--outline);
    margin-top: auto; /* Pin to the bottom of drawer */
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.theme-selector-label {
    font-size: 11px;
    font-weight: 700;
    color: var(--secondary);
    opacity: 0.8;
    display: flex;
    align-items: center;
    gap: 6px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.theme-buttons-row {
    display: flex;
    gap: 10px;
    padding-top: 4px;
}

.theme-btn {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    border: 2px solid transparent;
    cursor: pointer;
    transition: transform 0.2s, border-color 0.2s;
    outline: none;
}

.theme-btn:hover {
    transform: scale(1.15);
}

.theme-btn.active {
    border-color: var(--on-surface);
    box-shadow: 0 0 6px rgba(0, 0, 0, 0.15);
}

.theme-btn.ocean { background-color: #007aff; }
.theme-btn.charcoal { background-color: #2e3440; }
.theme-btn.emerald { background-color: #2e7d32; }
.theme-btn.sunset { background-color: #d84315; }

/* -------------------------------------------------------------
   Admin Gate Passcode Login Screen
------------------------------------------------------------- */
.admin-login-card {
    max-width: 360px;
    margin: 60px auto;
    padding: 24px;
    background-color: var(--surface);
    border: 1px solid var(--outline);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--hover-shadow);
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.admin-gate-icon {
    font-size: 40px;
    color: var(--primary);
    margin-bottom: 8px;
}

.admin-login-card h3 {
    font-size: 18px;
    font-weight: 800;
}

.admin-login-card p {
    font-size: 13px;
    color: var(--secondary);
    line-height: 18px;
}

/* -------------------------------------------------------------
   Admin Panel Workspace Dashboard
------------------------------------------------------------- */
.admin-workspace-header {
    padding: 16px 20px;
    background-color: var(--surface);
    border-bottom: 1px solid var(--outline);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.admin-user-title h3 {
    font-size: 16px;
    font-weight: 800;
}

.admin-user-title span {
    font-size: 11px;
    color: var(--success);
    font-weight: 600;
}

.admin-logout-btn {
    padding: 6px 14px;
    background: none;
    border: 1px solid var(--danger);
    color: var(--danger);
    border-radius: var(--border-radius-sm);
    font-size: 12px;
    font-weight: 700;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: background-color 0.2s, color 0.2s;
}

.admin-logout-btn:hover {
    background-color: var(--danger);
    color: #fff;
}

.admin-tabs-row {
    display: flex;
    gap: 8px;
    padding: 12px 20px;
    background-color: var(--surface-variant);
    border-bottom: 1px solid var(--outline);
    overflow-x: auto;
    -ms-overflow-style: none;
    scrollbar-width: none;
}

.admin-tabs-row::-webkit-scrollbar {
    display: none;
}

.admin-tab-btn {
    padding: 6px 16px;
    background-color: var(--surface);
    color: var(--on-surface-variant);
    border: 1px solid var(--outline);
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
    white-space: nowrap;
    transition: background-color 0.2s, color 0.2s;
}

.admin-tab-btn.active {
    background-color: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

.admin-tab-workspace {
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    overflow-y: auto;
}

.admin-tab-body {
    display: none;
    flex-direction: column;
    gap: 20px;
}

.admin-tab-body.active {
    display: flex;
}

/* Forms */
.admin-form {
    background-color: var(--surface);
    border: 1px solid var(--outline);
    border-radius: var(--border-radius-lg);
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 14px;
    box-shadow: var(--card-shadow);
}

.admin-form h4 {
    font-size: 15px;
    font-weight: 800;
    border-left: 3px solid var(--primary);
    padding-left: 8px;
    margin-bottom: 4px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.form-group label {
    font-size: 11px;
    font-weight: 700;
    color: var(--secondary);
}

.form-input-field {
    width: 100%;
    height: 40px;
    border: 1px solid var(--outline);
    border-radius: var(--border-radius-sm);
    padding: 0 12px;
    font-size: 13px;
    outline: none;
    background-color: var(--surface);
    color: var(--on-surface);
    transition: border-color 0.2s;
}

.form-input-field:focus {
    border-color: var(--primary);
}

textarea.form-input-field {
    height: auto;
    padding: 10px 12px;
}

.admin-submit-btn {
    height: 42px;
    background-color: var(--primary);
    color: #fff;
    border: none;
    border-radius: var(--border-radius-sm);
    font-size: 13px;
    font-weight: 700;
    cursor: pointer;
    transition: opacity 0.2s;
}

.admin-submit-btn:hover {
    opacity: 0.9;
}

/* Data Tables */
.admin-data-list-section {
    background-color: var(--surface);
    border: 1px solid var(--outline);
    border-radius: var(--border-radius-lg);
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 14px;
    box-shadow: var(--card-shadow);
}

.admin-data-list-section h4 {
    font-size: 15px;
    font-weight: 800;
}

.admin-table-container {
    overflow-x: auto;
}

.admin-data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}

.admin-data-table th,
.admin-data-table td {
    padding: 10px 12px;
    border-bottom: 1px solid var(--outline);
    text-align: left;
}

.admin-data-table th {
    font-weight: 700;
    color: var(--secondary);
    background-color: var(--surface-variant);
}

.admin-delete-btn {
    background: none;
    border: none;
    color: var(--danger);
    cursor: pointer;
    font-size: 14px;
    padding: 4px;
}

.admin-delete-btn:hover {
    opacity: 0.7;
}

.admin-danger-action-btn {
    padding: 6px 12px;
    background-color: rgba(229, 57, 53, 0.1);
    color: var(--danger);
    border: none;
    border-radius: var(--border-radius-sm);
    font-size: 11px;
    font-weight: 700;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
}

.admin-danger-action-btn:hover {
    background-color: var(--danger);
    color: #fff;
}

/* ==========================================================================
   11. Detailed Answers Review Styles
   ========================================================================== */
.review-summary-box {
    background-color: var(--surface-variant);
    border-radius: var(--border-radius-md);
    padding: 16px;
    margin-bottom: 20px;
    border: 1px solid var(--outline);
}

.review-summary-box h3 {
    margin-top: 0;
    margin-bottom: 12px;
    font-size: 16px;
    color: var(--on-surface);
}

.review-stats-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.review-chip {
    font-size: 11px;
    font-weight: 700;
    padding: 4px 10px;
    border-radius: 12px;
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.review-chip.correct {
    background-color: rgba(76, 175, 80, 0.15);
    color: var(--success, #4CAF50);
}

.review-chip.incorrect {
    background-color: rgba(229, 57, 53, 0.15);
    color: var(--danger, #E53935);
}

.review-chip.skipped {
    background-color: rgba(120, 120, 120, 0.15);
    color: #757575;
}

.review-chip.double {
    background-color: rgba(255, 152, 0, 0.15);
    color: var(--warning, #FF9800);
}

.review-questions-container {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.review-q-card {
    background-color: var(--surface);
    border: 1px solid var(--outline);
    border-radius: var(--border-radius-md);
    padding: 16px;
    box-shadow: var(--card-shadow);
}

.review-q-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 12px;
    gap: 12px;
}

.review-q-num {
    font-weight: 700;
    font-size: 14px;
    color: var(--primary);
}

.review-status-badge {
    font-size: 10px;
    font-weight: 700;
    padding: 2px 8px;
    border-radius: 4px;
    text-transform: uppercase;
}

.review-status-badge.correct {
    background-color: rgba(76, 175, 80, 0.1);
    color: var(--success, #4CAF50);
    border: 1px solid var(--success, #4CAF50);
}

.review-status-badge.incorrect {
    background-color: rgba(229, 57, 53, 0.1);
    color: var(--danger, #E53935);
    border: 1px solid var(--danger, #E53935);
}

.review-status-badge.skipped {
    background-color: rgba(120, 120, 120, 0.1);
    color: #757575;
    border: 1px solid #757575;
}

.review-status-badge.double {
    background-color: rgba(255, 152, 0, 0.1);
    color: var(--warning, #FF9800);
    border: 1px solid var(--warning, #FF9800);
}

.review-q-text {
    font-size: 14px;
    line-height: 1.5;
    margin-bottom: 14px;
    color: var(--on-surface);
}

.review-options-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 16px;
}

.review-option-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    border-radius: var(--border-radius-sm);
    border: 1px solid var(--outline);
    font-size: 13px;
    color: var(--on-surface);
    background-color: var(--surface);
}

.review-option-item.correct-answer {
    border-color: var(--success, #4CAF50);
    background-color: rgba(76, 175, 80, 0.05);
    font-weight: 600;
}

.review-option-item.wrong-selected {
    border-color: var(--danger, #E53935);
    background-color: rgba(229, 57, 53, 0.05);
}

.review-option-item.double-selected {
    border-color: var(--warning, #FF9800);
    background-color: rgba(255, 152, 0, 0.05);
}

.review-opt-letter {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    border: 1px solid var(--outline);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 12px;
}

.review-option-item.correct-answer .review-opt-letter {
    background-color: var(--success, #4CAF50);
    color: #fff;
    border-color: var(--success, #4CAF50);
}

.review-option-item.wrong-selected .review-opt-letter {
    background-color: var(--danger, #E53935);
    color: #fff;
    border-color: var(--danger, #E53935);
}

.review-option-item.double-selected .review-opt-letter {
    background-color: var(--warning, #FF9800);
    color: #fff;
    border-color: var(--warning, #FF9800);
}

.review-explanation-btn {
    width: 100%;
    padding: 10px;
    background-color: var(--surface-variant);
    border: 1px solid var(--outline);
    border-radius: var(--border-radius-sm);
    color: var(--primary);
    font-size: 12px;
    font-weight: 700;
    cursor: pointer;
    text-align: left;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background-color 0.2s;
}

.review-explanation-btn:hover {
    background-color: var(--outline);
}

.review-explanation-content {
    display: none;
    padding: 12px;
    background-color: var(--surface-variant);
    border: 1px dashed var(--outline);
    border-radius: var(--border-radius-sm);
    margin-top: 6px;
    font-size: 12px;
    line-height: 1.5;
    color: var(--on-surface-variant);
}

.review-explanation-content.active {
    display: block;
}

/* ==========================================================================
   12. Leaderboard Screen Styles
   ========================================================================== */
.leaderboard-tabs {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 20px;
}

.leaderboard-tab {
    padding: 8px 16px;
    background-color: var(--surface-variant);
    border: 1px solid var(--outline);
    border-radius: var(--border-radius-sm);
    color: var(--on-surface-variant);
    font-size: 13px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s;
}

.leaderboard-tab.active {
    background-color: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

.podium-container {
    display: flex;
    justify-content: center;
    align-items: flex-end;
    gap: 12px;
    margin-top: 10px;
    margin-bottom: 24px;
    padding: 10px 0;
}

.podium-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    flex: 1;
    max-width: 110px;
}

.podium-avatar-box {
    position: relative;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background-color: var(--primary-container);
    color: var(--on-primary-container);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 18px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    margin-bottom: 8px;
    border: 3px solid transparent;
}

.podium-item.first .podium-avatar-box {
    width: 76px;
    height: 76px;
    font-size: 22px;
    border-color: #FFD700; /* Gold */
}

.podium-item.second .podium-avatar-box {
    border-color: #C0C0C0; /* Silver */
}

.podium-item.third .podium-avatar-box {
    border-color: #CD7F32; /* Bronze */
}

.podium-crown {
    position: absolute;
    top: -14px;
    font-size: 16px;
    color: #FFD700;
}

.podium-pill {
    width: 100%;
    text-align: center;
    padding: 10px 6px;
    border-radius: var(--border-radius-md) var(--border-radius-md) 0 0;
    font-weight: 800;
    color: #fff;
    box-shadow: var(--card-shadow);
}

.podium-item.first .podium-pill {
    height: 80px;
    background: linear-gradient(135deg, #FFD700, #FFA500);
}

.podium-item.second .podium-pill {
    height: 60px;
    background: linear-gradient(135deg, #bdc3c7, #2c3e50);
}

.podium-item.third .podium-pill {
    height: 50px;
    background: linear-gradient(135deg, #CD7F32, #8B4513);
}

.podium-name {
    font-size: 11px;
    font-weight: 700;
    margin-bottom: 2px;
    color: var(--on-surface);
    text-align: center;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    width: 100px;
}

.podium-score {
    font-size: 10px;
    color: var(--on-surface-variant);
    font-weight: 500;
    margin-bottom: 4px;
}

.rankings-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 80px;
}

.rank-row {
    display: flex;
    align-items: center;
    padding: 12px 16px;
    background-color: var(--surface);
    border: 1px solid var(--outline);
    border-radius: var(--border-radius-md);
    gap: 12px;
    box-shadow: var(--card-shadow);
    transition: transform 0.2s;
}

.rank-row.highlighted {
    border-color: var(--primary);
    background-color: rgba(33, 150, 243, 0.05);
    font-weight: 600;
}

.rank-number {
    font-weight: 800;
    font-size: 14px;
    color: var(--on-surface-variant);
    width: 24px;
}

.rank-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background-color: var(--primary-container);
    color: var(--on-primary-container);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 14px;
}

.rank-details {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.rank-name {
    font-size: 13px;
    color: var(--on-surface);
}

.rank-sub-details {
    font-size: 10px;
    color: var(--on-surface-variant);
}

.rank-score-val {
    font-weight: 800;
    font-size: 13px;
    color: var(--primary);
}

.my-rank-banner {
    position: sticky;
    bottom: 56px;
    left: 0;
    right: 0;
    background-color: var(--primary-container);
    border-top: 1px solid var(--outline);
    padding: 14px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    box-shadow: 0 -4px 10px rgba(0,0,0,0.06);
    z-index: 10;
}

.my-rank-banner-info {
    display: flex;
    align-items: center;
    gap: 12px;
}

.my-rank-banner-details h4 {
    margin: 0;
    font-size: 13px;
    color: var(--on-primary-container);
}

.my-rank-banner-details span {
    font-size: 10px;
    color: var(--on-primary-container);
    opacity: 0.8;
}

/* ==========================================================================
   13. Performance Analytics SVG Styles
   ========================================================================== */
.chart-grid-line {
    stroke: var(--outline);
    stroke-opacity: 0.5;
    stroke-dasharray: 4,4;
}

.chart-axis-line {
    stroke: var(--on-surface-variant);
    stroke-width: 1.5;
}

.chart-line {
    stroke: var(--primary);
    stroke-width: 3;
    fill: none;
    stroke-linecap: round;
    transition: all 0.3s;
}

.chart-line-shadow {
    stroke: var(--primary);
    stroke-width: 8;
    fill: none;
    stroke-linecap: round;
    opacity: 0.1;
}

.chart-point {
    fill: var(--primary);
    stroke: var(--surface);
    stroke-width: 2.5;
    cursor: pointer;
    transition: r 0.2s;
}

.chart-point:hover {
    r: 7;
}

.chart-label {
    fill: var(--on-surface-variant);
    font-size: 10px;
    font-weight: 500;
    font-family: 'Inter', sans-serif;
}

.chart-bar {
    fill: var(--primary);
    rx: 4;
    transition: width 0.5s ease-out;
}

.chart-bar-bg {
    fill: var(--surface-variant);
    rx: 4;
}