/* ==========================================================================
   Apex Rankers Academy - Core Design System & Stylesheet
   ========================================================================== */

/* Google Fonts Import */
@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700&family=Plus+Jakarta+Sans:wght@300;400;500;600;700&display=swap');

:root {
    /* Color Palette - Modern Dark Theme */
    --bg-base: #0b0f19;
    --bg-surface: #151b2c;
    --bg-surface-hover: #1e263e;
    --border-color: rgba(255, 255, 255, 0.08);
    --border-glow: rgba(16, 185, 129, 0.2);
    
    --text-main: #f3f4f6;
    --text-muted: #9ca3af;
    --text-dimmed: #6b7280;
    --text-heading: #ffffff;
    
    --bg-navbar: rgba(21, 27, 44, 0.8);
    --bg-navbar-mobile: rgba(12, 16, 29, 0.98);
    --btn-primary-text: #000000;
    --bg-option-key: rgba(255, 255, 255, 0.1);
    --bg-modal-overlay: rgba(11, 15, 25, 0.95);
    
    --success: hsl(162, 84%, 45%);
    --correct-key-text: #000000;
    
    --primary-glow: rgba(16, 185, 129, 0.4);
    --card-shadow-glow: rgba(16, 185, 129, 0.05);
    
    /* Accents (HSL for easy opacity adjustments) */
    --primary-h: 162;
    --primary-s: 84%;
    --primary-l: 45%;
    --primary: hsl(var(--primary-h), var(--primary-s), var(--primary-l)); /* Emerald Green */
    
    --secondary-h: 217;
    --secondary-s: 91%;
    --secondary-l: 60%;
    --secondary: hsl(var(--secondary-h), var(--secondary-s), var(--secondary-l)); /* Royal Blue */
    
    --danger-h: 350;
    --danger-s: 84%;
    --danger-l: 55%;
    --danger: hsl(var(--danger-h), var(--danger-s), var(--danger-l)); /* Crimson */
    
    --warning-h: 38;
    --warning-s: 92%;
    --warning-l: 50%;
    --warning: hsl(var(--warning-h), var(--warning-s), var(--warning-l)); /* Amber */
    
    /* Layout & Spacing */
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --max-width: 1200px;
    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s ease;

    /* Scrollbars & Panel Borders */
    --scrollbar-thumb: rgba(255, 255, 255, 0.28);
    --scrollbar-thumb-hover: rgba(255, 255, 255, 0.48);
    --scrollbar-track: rgba(255, 255, 255, 0.04);
    --panel-border: rgba(255, 255, 255, 0.12);
    --panel-shadow: 0 4px 20px rgba(0, 0, 0, 0.35);
}

/* Light Theme Variables - Matches Company Logo (Dark Navy Blue, Light Teal Blue, Gold/Mustard Yellow) */
.light-theme {
    --bg-base: #f4f6f9; /* Soft cool light blue-gray tint */
    --bg-surface: #ffffff;
    --bg-surface-hover: #e2e8f0; /* Slate 200 */
    --border-color: rgba(25, 63, 102, 0.08); /* Navy Blue border */
    --border-glow: rgba(20, 184, 166, 0.15); /* Teal glow */
    
    --text-main: #334155; /* Slate 700 */
    --text-muted: #64748b; /* Slate 500 */
    --text-dimmed: #94a3b8; /* Slate 400 */
    --text-heading: #193f66; /* Logo Dark Navy Blue */
    
    --bg-navbar: rgba(255, 255, 255, 0.85);
    --bg-navbar-mobile: rgba(255, 255, 255, 0.98);
    --btn-primary-text: #ffffff;
    --bg-option-key: rgba(25, 63, 102, 0.08);
    --bg-modal-overlay: rgba(244, 246, 249, 0.95);
    --correct-key-text: #ffffff;
    
    /* Accessibility contrast adjustments for primary/secondary */
    --primary-h: 185; /* Light Teal Blue */
    --primary-s: 85%;
    --primary-l: 38%; /* Adjusted for high accessibility on white */
    
    --secondary-h: 42; /* Gold / Mustard Yellow */
    --secondary-s: 85%;
    --secondary-l: 40%;
    
    --success: hsl(162, 84%, 35%);
    --correct-key-text: #ffffff;
    
    --primary-glow: rgba(20, 184, 166, 0.35);
    --card-shadow-glow: rgba(20, 184, 166, 0.05);

    /* Enhanced Light Mode Borders, Shadows & Visible Scrollbars */
    --border-color: rgba(25, 63, 102, 0.16);
    --panel-border: rgba(25, 63, 102, 0.18);
    --panel-shadow: 0 4px 18px rgba(25, 63, 102, 0.08);
    --scrollbar-thumb: rgba(25, 63, 102, 0.38);
    --scrollbar-thumb-hover: rgba(25, 63, 102, 0.6);
    --scrollbar-track: rgba(25, 63, 102, 0.07);
}

/* Theme Toggle Button Styling */
.theme-toggle-btn {
    background: transparent;
    border: none;
    font-size: 18px;
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
    width: 36px;
    height: 36px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: background-color var(--transition-fast), transform var(--transition-fast);
    color: var(--text-main);
}
.theme-toggle-btn:hover {
    background-color: var(--bg-surface-hover);
    transform: scale(1.1);
}

/* Base Resets */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    background-color: var(--bg-base);
    color: var(--text-main);
    font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-family: 'Outfit', sans-serif;
    font-weight: 600;
    color: var(--text-heading);
    line-height: 1.25;
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}
a:hover {
    color: hsl(var(--primary-h), var(--primary-s), calc(var(--primary-l) + 10%));
}

button, .btn {
    font-family: inherit;
    font-weight: 500;
    cursor: pointer;
}

/* ==========================================================================
   Layout Containers & Grid System
   ========================================================================== */

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

.main-layout {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.main-content {
    flex: 1;
    padding: 40px 0;
}

/* Navigation Header */
.navbar {
    background-color: var(--bg-navbar);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
    height: 70px;
    display: flex;
    align-items: center;
}

.navbar-inner {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar-brand {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-heading);
    display: flex;
    align-items: center;
    gap: 8px;
}
.navbar-brand span {
    color: var(--primary);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 24px;
    list-style: none;
}
.nav-links a {
    color: var(--text-muted);
    font-size: 15px;
    font-weight: 500;
}
.nav-links a:hover, .nav-links a.active {
    color: var(--text-heading);
}

.nav-auth {
    display: flex;
    align-items: center;
    gap: 16px;
}

/* Hamburger Toggle Button */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 24px;
    height: 16px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 101;
}

.mobile-menu-toggle span {
    width: 100%;
    height: 2px;
    background-color: var(--text-heading);
    border-radius: 2px;
    transition: all 0.3s ease;
}

/* On screens under 992px (tablets & mobiles) */
@media (max-width: 992px) {
    .mobile-menu-toggle {
        display: flex;
    }
    
    .navbar-inner nav {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background-color: var(--bg-navbar-mobile);
        backdrop-filter: blur(16px);
        -webkit-backdrop-filter: blur(16px);
        border-bottom: 1px solid var(--border-color);
        padding: 24px;
        display: none; /* Controlled by active class */
        z-index: 99;
        box-shadow: 0 10px 30px rgba(0,0,0,0.5);
    }
    
    .navbar-inner nav.active {
        display: block;
    }
    
    .nav-links {
        flex-direction: column;
        align-items: stretch;
        gap: 16px;
    }
    
    .nav-links li {
        width: 100%;
    }
    
    .nav-links a {
        display: block;
        padding: 10px 0;
        font-size: 16px;
        border-bottom: 1px solid var(--border-color);
        width: 100%;
    }
    
    .nav-auth span {
        display: none !important; /* hide Hello username to avoid crowding */
    }
    
    .navbar-inner {
        padding: 0 16px;
    }
}

/* Hamburger animations */
.mobile-menu-toggle.active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}
.mobile-menu-toggle.active span:nth-child(2) {
    opacity: 0;
}
.mobile-menu-toggle.active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

@media (max-width: 480px) {
    .navbar-brand {
        font-size: 15px;
    }
    .navbar-brand img {
        height: 28px !important;
    }
    .nav-auth {
        gap: 8px;
    }
    .nav-auth a {
        padding: 6px 12px !important;
        font-size: 12px !important;
    }
}

/* ========================================================================== */

/* ==========================================================================
   Buttons
   ========================================================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    transition: all var(--transition-fast);
    border: none;
}

.btn-primary {
    background-color: var(--primary);
    color: var(--btn-primary-text);
    font-weight: 600;
}
.btn-primary:hover {
    background-color: hsl(var(--primary-h), var(--primary-s), calc(var(--primary-l) + 5%));
    box-shadow: 0 0 16px var(--primary-glow);
}

.btn-secondary {
    background-color: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-main);
}
.btn-secondary:hover {
    background-color: var(--bg-surface-hover);
    border-color: var(--text-muted);
}

.btn-danger {
    background-color: var(--danger);
    color: #ffffff;
    font-weight: 600;
}
.btn-danger:hover {
    box-shadow: 0 0 16px rgba(239, 68, 68, 0.4);
}

/* ==========================================================================
   Cards & Grids
   ========================================================================== */

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}

.card {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 24px;
    transition: transform var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal);
}
.card:hover {
    transform: translateY(-4px);
    border-color: var(--border-glow);
    box-shadow: 0 8px 30px var(--card-shadow-glow);
}

.card-title {
    font-size: 18px;
    margin-bottom: 8px;
}

.card-desc {
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 16px;
    min-height: 44px;
}

/* ==========================================================================
   Homepage / Landing Sections
   ========================================================================== */

.hero {
    text-align: center;
    padding: 60px 0;
    max-width: 800px;
    margin: 0 auto;
}
.hero h1 {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 16px;
    background: linear-gradient(135deg, var(--text-heading) 50%, var(--text-muted));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}
.hero p {
    font-size: 18px;
    color: var(--text-muted);
    margin-bottom: 24px;
}

.section-title {
    font-size: 28px;
    margin: 40px 0 20px 0;
    display: flex;
    align-items: center;
    gap: 12px;
}
.section-title::after {
    content: '';
    flex: 1;
    height: 1px;
    background-color: var(--border-color);
}

/* Academic level cards */
.academic-row {
    background: rgba(255,255,255,0.01);
    border-radius: var(--radius-lg);
    padding: 30px;
    margin-bottom: 30px;
    border: 1px solid var(--border-color);
}
.academic-row h3 {
    margin-bottom: 20px;
    font-size: 20px;
    color: var(--secondary);
}

.subject-badge-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.subject-badge {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    padding: 12px 20px;
    border-radius: var(--radius-sm);
    color: var(--text-main);
    font-weight: 500;
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 8px;
}
.subject-badge:hover {
    border-color: var(--primary);
    background: var(--bg-surface-hover);
    color: var(--text-heading);
}

/* ==========================================================================
   Practice Client Interface
   ========================================================================== */

.practice-workspace {
    display: grid;
    grid-template-columns: 1fr;
    gap: 30px;
}

.passage-panel {
    background: var(--bg-surface-hover);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 24px;
    max-height: 250px;
    overflow-y: auto;
    font-size: 15px;
    line-height: 1.8;
}

.question-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 30px;
}

.question-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-muted);
    font-size: 13px;
    margin-bottom: 20px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-color);
}

.question-body h2 {
    font-size: 20px;
    color: var(--text-heading);
    margin-bottom: 24px;
}

.options-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 24px;
}

.option-btn {
    background: var(--bg-surface-hover);
    border: 1px solid var(--border-color);
    padding: 16px 20px;
    border-radius: var(--radius-sm);
    text-align: left;
    font-size: 15px;
    color: var(--text-main);
    display: flex;
    align-items: center;
    gap: 12px;
    transition: all var(--transition-fast);
}
.option-btn:hover:not(:disabled) {
    background: hsla(var(--primary-h), var(--primary-s), var(--primary-l), 0.08);
    border-color: var(--primary);
}
.option-btn .option-key {
    background: var(--bg-option-key);
    color: var(--text-main);
    width: 26px;
    height: 26px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 13px;
    flex-shrink: 0;
}

/* Feedback states */
.option-btn.correct {
    background: rgba(16, 185, 129, 0.15) !important;
    border-color: var(--success) !important;
    color: var(--success) !important;
}
.option-btn.correct .option-key {
    background: var(--success) !important;
    color: var(--correct-key-text) !important;
}

.option-btn.incorrect {
    background: rgba(239, 68, 68, 0.15) !important;
    border-color: var(--danger) !important;
    color: var(--danger) !important;
}
.option-btn.incorrect .option-key {
    background: var(--danger) !important;
    color: #ffffff !important;
}

/* Match the Columns UI */
.match-columns-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    margin-bottom: 30px;
}

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

.match-item {
    background: var(--bg-surface-hover);
    border: 1px solid var(--border-color);
    padding: 14px 20px;
    border-radius: var(--radius-sm);
    text-align: center;
    cursor: pointer;
    font-weight: 500;
    transition: all var(--transition-fast);
}
.match-item:hover:not(.matched) {
    border-color: var(--text-muted);
}
.match-item.selected {
    border-color: var(--secondary);
    background: rgba(59, 130, 246, 0.1);
}
.match-item.matched {
    border-color: var(--success);
    background: rgba(16, 185, 129, 0.1);
    cursor: default;
}

/* Rationale panel */
.rationale-panel {
    background: rgba(16, 185, 129, 0.05);
    border: 1px solid rgba(16, 185, 129, 0.2);
    border-radius: var(--radius-sm);
    padding: 20px;
    margin-top: 24px;
}
.rationale-panel h4 {
    color: var(--primary);
    margin-bottom: 8px;
    font-size: 15px;
}

/* ==========================================================================
   Mock Test Attempt Client - Responsive Split Scroll & High-Contrast Themes
   ========================================================================== */

/* Overall Desktop Layout: 2 Columns with fixed full-height view */
.mock-test-layout {
    display: grid;
    grid-template-columns: 290px 1fr;
    gap: 20px;
    height: calc(100vh - 110px);
    max-height: calc(100vh - 110px);
    min-height: 520px;
    overflow: hidden;
    margin-top: 10px;
}

/* Desktop Left Control Panel */
.test-control-panel {
    background: var(--bg-surface);
    border: 1.5px solid var(--panel-border, var(--border-color));
    border-radius: var(--radius-md);
    box-shadow: var(--panel-shadow, 0 4px 20px rgba(0, 0, 0, 0.15));
    padding: 16px;
    display: flex;
    flex-direction: column;
    height: 100%;
    max-height: 100%;
    overflow: hidden;
    box-sizing: border-box;
}

.panel-fixed-header {
    display: flex;
    flex-direction: column;
    gap: 10px;
    flex-shrink: 0;
}

.palette-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 13px;
    font-weight: 700;
    color: var(--text-heading);
    padding: 10px 0 6px 0;
    border-bottom: 1.5px solid var(--panel-border, var(--border-color));
    margin-top: 8px;
    flex-shrink: 0;
}

/* Question Sheet buttons scrollable vertically on desktop */
.questions-nav-scroll-container {
    flex: 1;
    overflow-y: auto;
    min-height: 0;
    margin: 10px 0;
    padding-right: 4px;
    scrollbar-width: thin;
    scrollbar-color: var(--scrollbar-thumb) var(--scrollbar-track);
}

.questions-nav-scroll-container::-webkit-scrollbar {
    width: 6px;
}
.questions-nav-scroll-container::-webkit-scrollbar-track {
    background: var(--scrollbar-track);
    border-radius: 4px;
}
.questions-nav-scroll-container::-webkit-scrollbar-thumb {
    background: var(--scrollbar-thumb);
    border-radius: 4px;
}
.questions-nav-scroll-container::-webkit-scrollbar-thumb:hover {
    background: var(--scrollbar-thumb-hover);
}

.questions-nav-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 7px;
}

.panel-fixed-footer {
    flex-shrink: 0;
    padding-top: 10px;
    border-top: 1.5px solid var(--panel-border, var(--border-color));
}

/* Right Question Area */
.test-question-area {
    display: flex;
    flex-direction: column;
    height: 100%;
    max-height: 100%;
    min-height: 0;
    overflow: hidden;
}

.question-card {
    display: flex;
    flex-direction: column;
    height: 100%;
    max-height: 100%;
    min-height: 0;
    background: var(--bg-surface);
    border: 1.5px solid var(--panel-border, var(--border-color));
    border-radius: var(--radius-md);
    box-shadow: var(--panel-shadow, 0 4px 20px rgba(0, 0, 0, 0.15));
    overflow: hidden;
    box-sizing: border-box;
}

.question-header {
    padding: 14px 20px;
    border-bottom: 1.5px solid var(--panel-border, var(--border-color));
    background: var(--bg-surface);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-shrink: 0;
}

/* Question body is scrollable separately */
.question-body {
    flex: 1;
    overflow-y: auto;
    min-height: 0;
    padding: 24px;
    scrollbar-width: thin;
    scrollbar-color: var(--scrollbar-thumb) var(--scrollbar-track);
}

.question-body::-webkit-scrollbar {
    width: 7px;
}
.question-body::-webkit-scrollbar-track {
    background: var(--scrollbar-track);
    border-radius: 4px;
}
.question-body::-webkit-scrollbar-thumb {
    background: var(--scrollbar-thumb);
    border-radius: 4px;
}
.question-body::-webkit-scrollbar-thumb:hover {
    background: var(--scrollbar-thumb-hover);
}

.question-footer {
    padding: 14px 20px;
    border-top: 1.5px solid var(--panel-border, var(--border-color));
    background: var(--bg-surface);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-shrink: 0;
}

/* Timer Widget */
.timer-widget {
    background: var(--bg-surface-hover);
    border: 1.5px solid var(--panel-border, var(--border-color));
    border-radius: var(--radius-sm);
    padding: 12px;
    text-align: center;
}
.timer-widget .label {
    font-size: 11px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 600;
}
.timer-widget .time {
    font-size: 26px;
    font-weight: 700;
    font-family: monospace;
    color: var(--warning);
}
.timer-widget.low-time .time {
    color: var(--danger);
    animation: pulse 1s infinite;
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.02); }
    100% { transform: scale(1); }
}

/* Warning strikes indicator */
.warnings-widget {
    background: rgba(239, 68, 68, 0.08);
    border: 1.5px solid rgba(239, 68, 68, 0.3);
    border-radius: var(--radius-sm);
    padding: 10px;
    text-align: center;
    color: var(--danger);
    font-weight: 600;
    font-size: 13px;
}

/* Nav Buttons */
.nav-btn {
    background: var(--bg-surface-hover);
    border: 1.5px solid var(--border-color);
    height: 36px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-main);
    transition: all var(--transition-fast);
    cursor: pointer;
    user-select: none;
}
.nav-btn:hover {
    color: var(--text-heading);
    border-color: var(--secondary);
    background: var(--bg-surface);
}
.nav-btn.active {
    border-color: var(--secondary);
    color: var(--text-heading);
    background: rgba(59, 130, 246, 0.22);
    box-shadow: 0 0 0 1.5px var(--secondary);
    font-weight: 700;
}
.nav-btn.answered {
    background: rgba(16, 185, 129, 0.22);
    border-color: var(--success);
    color: var(--success);
    font-weight: 700;
}
.nav-btn.review {
    background: rgba(245, 158, 11, 0.28);
    border-color: var(--warning);
    color: var(--warning);
    font-weight: 700;
}

/* Light Mode specific overrides for perfect contrast */
.light-theme .nav-btn {
    background: #eef2f7;
    border-color: rgba(25, 63, 102, 0.22);
    color: #1e293b;
}
.light-theme .nav-btn:hover {
    background: #ffffff;
    border-color: var(--secondary);
    color: #0f172a;
}
.light-theme .nav-btn.active {
    background: rgba(43, 114, 186, 0.18);
    border-color: #2b72ba;
    color: #193f66;
    box-shadow: 0 0 0 1.5px #2b72ba;
}
.light-theme .nav-btn.answered {
    background: rgba(16, 185, 129, 0.18);
    border-color: #059669;
    color: #047857;
}
.light-theme .nav-btn.review {
    background: rgba(245, 158, 11, 0.22);
    border-color: #d97706;
    color: #b45309;
}
.light-theme .question-header {
    background: #f8fafc;
    border-bottom: 1.5px solid rgba(25, 63, 102, 0.15);
}
.light-theme .question-footer {
    background: #f8fafc;
    border-top: 1.5px solid rgba(25, 63, 102, 0.15);
}
.light-theme .mobile-horizontal-palette {
    background: #f1f5f9;
    border-top: 1.5px solid rgba(25, 63, 102, 0.2);
}
.light-theme .option-btn {
    background: #f8fafc;
    border: 1.5px solid rgba(25, 63, 102, 0.16);
    color: #1e293b;
}
.light-theme .option-btn:hover {
    background: #ffffff;
    border-color: rgba(25, 63, 102, 0.35);
}
.light-theme .option-btn.correct {
    background: rgba(16, 185, 129, 0.16);
    border-color: #059669;
}

/* Responsive Visibility Helpers */
.mobile-only {
    display: none !important;
}
.desktop-only {
    display: block;
}
.palette-header.desktop-only {
    display: flex;
}

/* ==========================================================================
   Mobile Screens Layout (< 900px): Fixed Top Timer/Strikes, Middle Scrollable
   Questions, Fixed Prev/Next, Bottom Horizontal Scrolling Question Palette
   ========================================================================== */
@media (max-width: 900px) {
    .desktop-only {
        display: none !important;
    }
    .mobile-only {
        display: block !important;
    }

    .mock-test-layout {
        display: flex;
        flex-direction: column;
        height: calc(100dvh - 70px);
        max-height: calc(100dvh - 70px);
        min-height: 0;
        gap: 6px;
        margin-top: 2px;
        overflow: hidden;
    }

    /* Fixed top bar for mobile */
    .test-control-panel {
        position: sticky;
        top: 0;
        z-index: 50;
        height: auto !important;
        max-height: none !important;
        padding: 6px 10px !important;
        margin-bottom: 0 !important;
        border-radius: var(--radius-sm) !important;
        background: var(--bg-surface) !important;
        box-shadow: 0 2px 10px rgba(0, 0, 0, 0.25) !important;
        border: 1.5px solid var(--panel-border, var(--border-color)) !important;
        flex-shrink: 0 !important;
    }

    .panel-fixed-header {
        flex-direction: row !important;
        align-items: center !important;
        justify-content: space-between !important;
        gap: 8px !important;
        width: 100% !important;
    }

    .timer-widget {
        padding: 6px 10px !important;
        display: flex !important;
        align-items: center !important;
        gap: 6px !important;
        background: var(--bg-surface-hover) !important;
        border-radius: var(--radius-sm) !important;
        flex: 1 !important;
        justify-content: center !important;
    }

    .timer-widget .label {
        font-size: 10px !important;
        margin-bottom: 0 !important;
    }

    .timer-widget .time {
        font-size: 17px !important;
    }

    .warnings-widget {
        padding: 6px 10px !important;
        font-size: 11px !important;
        white-space: nowrap !important;
        border-radius: var(--radius-sm) !important;
    }

    .mobile-top-submit-btn {
        display: inline-block !important;
        padding: 6px 12px !important;
        font-size: 12px !important;
        font-weight: 600 !important;
        white-space: nowrap !important;
    }

    /* Middle Question Area */
    .test-question-area {
        flex: 1 !important;
        min-height: 0 !important;
        overflow: hidden !important;
    }

    .question-card {
        flex: 1 !important;
        min-height: 0 !important;
        border-radius: var(--radius-sm) !important;
    }

    .question-header {
        padding: 8px 12px !important;
        font-size: 13px !important;
    }

    .question-body {
        padding: 12px !important;
    }

    .question-body h2 {
        font-size: 16px !important;
        margin-bottom: 14px !important;
    }

    .option-btn {
        padding: 12px 14px !important;
        font-size: 14px !important;
    }

    /* Fixed Navigation Controls */
    .question-footer {
        padding: 8px 12px !important;
        background: var(--bg-surface) !important;
    }

    .question-footer .btn {
        padding: 8px 16px !important;
        font-size: 13px !important;
    }

    /* Horizontal Question Strip below prev/next */
    .mobile-horizontal-palette {
        background: var(--bg-surface-hover);
        border-top: 1.5px solid var(--panel-border, var(--border-color));
        padding: 6px 8px 8px 8px;
        flex-shrink: 0;
    }

    .questions-horizontal-strip {
        display: flex;
        flex-direction: row;
        flex-wrap: nowrap;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        gap: 6px;
        padding: 2px;
        scrollbar-width: thin;
        scrollbar-color: var(--scrollbar-thumb) var(--scrollbar-track);
    }

    .questions-horizontal-strip::-webkit-scrollbar {
        height: 5px;
    }
    .questions-horizontal-strip::-webkit-scrollbar-track {
        background: var(--scrollbar-track);
        border-radius: 4px;
    }
    .questions-horizontal-strip::-webkit-scrollbar-thumb {
        background: var(--scrollbar-thumb);
        border-radius: 4px;
    }
    .questions-horizontal-strip::-webkit-scrollbar-thumb:hover {
        background: var(--scrollbar-thumb-hover);
    }

    .questions-horizontal-strip .nav-btn {
        flex: 0 0 38px !important;
        width: 38px !important;
        height: 36px !important;
        min-width: 38px !important;
        font-size: 13px !important;
        border-radius: 6px !important;
    }
}

/* Modal proctoring overlay */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: var(--bg-modal-overlay);
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
}
.modal-content {
    background: var(--bg-surface);
    border: 1px solid var(--danger);
    border-radius: var(--radius-md);
    padding: 40px;
    max-width: 500px;
    text-align: center;
    box-shadow: 0 0 40px rgba(239, 68, 68, 0.15);
}
.modal-content h3 {
    color: var(--danger);
    font-size: 24px;
    margin-bottom: 16px;
}
.modal-content p {
    color: var(--text-muted);
    margin-bottom: 24px;
}

/* ==========================================================================
   Paper print & Header Styles
   ========================================================================== */

.paper-actions-bar {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    padding: 16px 24px;
    border-radius: var(--radius-sm);
    margin-bottom: 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* Standard Academic Print Out Style (For Screen preview) */
.printable-sheet {
    background: #ffffff;
    color: #000000;
    padding: 40px;
    border-radius: var(--radius-md);
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
    max-width: 800px;
    margin: 0 auto;
    font-family: 'Times New Roman', Times, serif;
    line-height: 1.4;
}

.printable-sheet h1, 
.printable-sheet h2, 
.printable-sheet h3, 
.printable-sheet h4, 
.printable-sheet h5, 
.printable-sheet h6 {
    color: #000000;
    font-family: 'Times New Roman', Times, serif;
}

.print-header {
    text-align: center;
    border-bottom: 2px solid #000000;
    padding-bottom: 16px;
    margin-bottom: 24px;
}
.print-header .inst-name {
    font-size: 22px;
    font-weight: 700;
    text-transform: uppercase;
}
.print-header .exam-name {
    font-size: 16px;
    font-weight: 600;
}

.print-meta-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 8px;
    font-size: 14px;
    margin-bottom: 16px;
}

.student-info-table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 24px;
}
.student-info-table td {
    padding: 6px;
    font-size: 14px;
    border: 1px solid #ddd;
}

.print-section {
    margin-bottom: 24px;
    page-break-inside: avoid;
}
.print-section-title {
    font-weight: 700;
    font-size: 15px;
    border-bottom: 1px solid #000000;
    padding-bottom: 4px;
    margin-bottom: 12px;
    display: flex;
    justify-content: space-between;
}

.print-q-item {
    font-size: 14px;
    margin-bottom: 12px;
    page-break-inside: avoid;
}

.print-options-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
    margin-top: 6px;
    font-size: 13px;
    padding-left: 20px;
}

/* Double column styling override */
.printable-sheet.double-column-mode .print-questions-body {
    column-count: 2;
    column-gap: 30px;
    column-rule: 1px solid #ccc;
}
.printable-sheet.double-column-mode .print-section {
    break-inside: avoid;
    -webkit-column-break-inside: avoid;
}

/* Bubble sheet grid */
.bubble-sheet-container {
    margin-top: 40px;
    border-top: 2px dashed #000000;
    padding-top: 24px;
    page-break-before: always;
}
.bubble-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}
.bubble-row {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 13px;
    font-family: monospace;
}
.bubble-circles {
    display: flex;
    gap: 6px;
}
.bubble-circle {
    width: 18px;
    height: 18px;
    border: 1px solid #000000;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 9px;
    font-weight: 700;
}

/* ==========================================================================
   Navbar Controls, User Dropdown & Light Theme Overrides
   ========================================================================== */

.navbar-controls {
    display: flex;
    align-items: center;
    gap: 16px;
}

.user-dropdown-container {
    position: relative;
    display: inline-block;
}

.dropdown-trigger-btn {
    background: transparent;
    border: none;
    cursor: pointer;
    color: var(--text-main);
    width: 38px;
    height: 38px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color var(--transition-fast), color var(--transition-fast);
}

.dropdown-trigger-btn:hover {
    background-color: var(--bg-surface-hover);
    color: var(--text-heading);
}

.dropdown-menu-list {
    display: none;
    position: absolute;
    right: 0;
    top: 48px;
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    min-width: 240px;
    padding: 8px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.25);
    z-index: 105;
    animation: dropdownFadeIn 0.2s ease;
}

.dropdown-menu-list.active {
    display: block;
}

@keyframes dropdownFadeIn {
    from { opacity: 0; transform: translateY(-8px); }
    to { opacity: 1; transform: translateY(0); }
}

.dropdown-user-info {
    font-size: 13px;
    color: var(--text-main);
    padding: 8px 12px;
    word-break: break-word;
    line-height: 1.45;
}

.dropdown-divider {
    border: 0;
    border-top: 1px solid var(--border-color);
    margin: 6px 0;
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: 10px;
    width: 100%;
    padding: 10px 12px;
    font-size: 14px;
    color: var(--text-main);
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    text-align: left;
    cursor: pointer;
    transition: background-color var(--transition-fast), color var(--transition-fast);
    box-sizing: border-box;
    text-decoration: none !important;
}

.dropdown-item:hover {
    background-color: var(--bg-surface-hover);
    color: var(--text-heading);
}

.dropdown-item.logout-link {
    color: var(--danger);
}
.dropdown-item.logout-link:hover {
    background-color: rgba(239, 68, 68, 0.08);
    color: var(--danger);
}

/* Universal Form & Select Dropdown Overrides for Light Theme */
.light-theme input, 
.light-theme select, 
.light-theme textarea,
.light-theme option {
    background-color: var(--bg-surface-hover) !important;
    color: var(--text-main) !important;
    border-color: var(--border-color) !important;
}

/* Universal Text & Heading Overrides for Light Theme */
.light-theme h1, 
.light-theme h2, 
.light-theme h3, 
.light-theme h4, 
.light-theme h5, 
.light-theme h6,
.light-theme label,
.light-theme legend,
.light-theme td,
.light-theme th,
.light-theme strong,
.light-theme .dropdown-user-info {
    color: var(--text-heading) !important;
}

/* Universal Inline Color Style Overrides in Light Theme */
.light-theme [style*="color: white" i],
.light-theme [style*="color:white" i],
.light-theme [style*="color: #ffffff" i],
.light-theme [style*="color:#ffffff" i],
.light-theme [style*="color: #fff" i],
.light-theme [style*="color:#fff" i] {
    color: var(--text-heading) !important;
}

/* ==========================================================================
   Print Media Stylesheets
   ========================================================================== */

@media print {
    /* Hide all browser components */
    body {
        background: #ffffff !important;
        color: #000000 !important;
    }
    
    .navbar, .footer, .paper-actions-bar, .no-print {
        display: none !important;
    }
    
    .main-content {
        padding: 0 !important;
    }
    
    .printable-sheet {
        box-shadow: none !important;
        padding: 0 !important;
        max-width: 100% !important;
        margin: 0 !important;
        border-radius: 0 !important;
    }
    
    /* Double column rendering in print */
    .printable-sheet.double-column-mode .print-questions-body {
        column-count: 2 !important;
        column-gap: 30px !important;
        column-rule: 1px solid #000000 !important;
    }
    
    /* Force page breaks cleanly */
    .page-break {
        page-break-before: always !important;
    }
}

/* ==========================================================================
   Responsive Layout Overrides
   ========================================================================== */

/* Responsive grids utility */
.responsive-grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
}

.responsive-grid-4 {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
}

.responsive-grid-sidebar {
    display: grid;
    grid-template-columns: 1fr 380px;
}

.responsive-grid-2-1 {
    display: grid;
    grid-template-columns: 2fr 1fr;
}

.mock-test-list-card {
    display: grid;
    grid-template-columns: 1fr 350px;
}

@media (max-width: 992px) {
    .responsive-grid-sidebar {
        grid-template-columns: 1fr !important;
    }
    .responsive-grid-2-1 {
        grid-template-columns: 1fr !important;
    }
    .responsive-grid-4 {
        grid-template-columns: repeat(2, 1fr) !important;
    }
    .mock-test-list-card {
        grid-template-columns: 1fr !important;
    }
    .stats-bar {
        grid-template-columns: repeat(2, 1fr) !important;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 10px !important;
    }
    
    .main-content {
        padding: 16px 0 32px 0 !important;
    }
    
    .card {
        padding: 16px 12px !important;
        border-radius: var(--radius-sm) !important;
    }

    .navbar {
        height: 60px;
    }

    .navbar-inner nav {
        top: 60px !important;
    }

    .navbar-brand img {
        height: 32px !important;
    }

    .hero {
        padding: 28px 8px !important;
    }
    .hero h1 {
        font-size: 26px !important;
        line-height: 1.25 !important;
    }
    .hero p {
        font-size: 14.5px !important;
        margin-bottom: 18px !important;
    }
    .section-title {
        font-size: 20px !important;
        margin: 24px 0 14px 0 !important;
    }

    .responsive-grid-2 {
        grid-template-columns: 1fr !important;
    }
    
    .responsive-grid-4 {
        grid-template-columns: 1fr !important;
    }
    
    .stats-bar {
        grid-template-columns: 1fr !important;
        padding: 0 !important;
        gap: 12px !important;
    }
    
    /* Summary items border swap in mock test results */
    .summary-item {
        border-right: none !important;
        border-bottom: 1px solid var(--border-color);
    }
    .summary-item:last-child {
        border-bottom: none !important;
    }

    /* Collapse all matching inline layouts in educator dashboard and panels */
    [style*="grid-template-columns: 1fr 1fr"],
    [style*="grid-template-columns: 1fr 1fr 1fr"],
    [style*="grid-template-columns: 1.5fr 1fr 1fr"],
    [style*="grid-template-columns: 1.2fr 1fr 1fr"],
    [style*="grid-template-columns: 1.2fr 1fr"],
    [style*="grid-template-columns: 1.5fr 1fr"],
    [style*="grid-template-columns: 1fr 2.5fr"],
    [style*="grid-template-columns: 1fr 380px"],
    [style*="grid-template-columns: 1fr 1fr 1fr 1fr"] {
        grid-template-columns: 1fr !important;
    }

    /* Allow flex rows to wrap on mobile */
    .flex-row-wrap,
    [style*="display: flex"][style*="gap:"] {
        flex-wrap: wrap !important;
    }

    /* Note cards and list page mobile optimization */
    .notes-filter-form {
        grid-template-columns: 1fr !important;
        gap: 10px !important;
    }
    .notes-filter-form button {
        width: 100% !important;
        padding: 10px 0 !important;
    }
    .note-card-flex {
        flex-direction: row !important;
        gap: 12px !important;
    }
    .note-card-cover {
        width: 85px !important;
        min-width: 85px !important;
        height: 120px !important;
        min-height: 120px !important;
    }
    .note-card-title {
        font-size: 14.5px !important;
        line-height: 1.35 !important;
    }

    /* Practice and Mock Test Question Cards on Mobile */
    .question-card {
        padding: 16px 12px !important;
    }
    .question-body h2 {
        font-size: 16px !important;
        margin-bottom: 16px !important;
    }
    .option-btn {
        padding: 12px 14px !important;
        font-size: 14px !important;
    }
    .passage-panel {
        padding: 14px 12px !important;
        font-size: 13.5px !important;
    }
    .modal-content {
        padding: 24px 16px !important;
    }

    /* MathJax font scaling on mobile */
    mjx-container {
        font-size: 96% !important;
    }
}

/* Universal MathJax & LaTeX Equation Responsiveness */
mjx-container:not([display="true"]) {
    display: inline-block !important;
    max-width: 100% !important;
    overflow: visible !important;
    vertical-align: middle !important;
}
mjx-container[jax="CHTML"][display="true"],
mjx-container[display="true"] {
    display: block !important;
    max-width: 100% !important;
    overflow-x: auto !important;
    overflow-y: hidden !important;
    text-align: center;
    margin: 12px 0 !important;
    padding: 4px 0 !important;
    scrollbar-width: thin;
    -webkit-overflow-scrolling: touch;
}
mjx-container[display="true"]::-webkit-scrollbar,
.latex-scrollable-line::-webkit-scrollbar {
    height: 4px;
}
mjx-container[display="true"]::-webkit-scrollbar-track,
.latex-scrollable-line::-webkit-scrollbar-track {
    background: transparent;
}
mjx-container[display="true"]::-webkit-scrollbar-thumb,
.latex-scrollable-line::-webkit-scrollbar-thumb {
    background: rgba(148, 163, 184, 0.4);
    border-radius: 4px;
}