/* ==========================================================================
   Zimbabwe Provisional Driving Test Web App - Core CSS Stylesheet
   Design System: Premium Glassmorphic Dark Mode Dashboard
   ========================================================================== */

:root {
    /* Color Palette (HSL Tailored) */
    --bg-dark: hsl(222, 25%, 8%);
    --bg-card: hsla(222, 25%, 14%, 0.65);
    --border-color: rgba(255, 255, 255, 0.08);
    --border-hover: rgba(255, 255, 255, 0.15);
    
    --text-primary: hsl(210, 20%, 95%);
    --text-secondary: hsl(210, 10%, 75%);
    --text-muted: hsl(210, 8%, 55%);
    
    /* Neon Accents */
    --neon-blue: hsl(200, 85%, 55%);
    --neon-blue-glow: hsla(200, 85%, 55%, 0.25);
    
    --neon-green: hsl(142, 72%, 45%);
    --neon-green-glow: hsla(142, 72%, 45%, 0.25);
    
    --neon-red: hsl(352, 75%, 50%);
    --neon-red-glow: hsla(352, 75%, 50%, 0.25);
    
    --gold: hsl(45, 90%, 50%);
    --gold-glow: hsla(45, 90%, 50%, 0.25);

    /* UI Measurements */
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --shadow-premium: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ==========================================================================
   Base Elements Reset
   ========================================================================== */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    background-color: var(--bg-dark);
    color: var(--text-primary);
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

h1, h2, h3, h4, h5, h6 {
    font-family: 'Outfit', sans-serif;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5em;
}

a {
    color: var(--neon-blue);
    text-decoration: none;
    transition: var(--transition-smooth);
}

a:hover {
    color: #fff;
    text-shadow: 0 0 8px var(--neon-blue-glow);
}

/* ==========================================================================
   Layout Boilerplate
   ========================================================================== */
.app-header {
    background-color: rgba(10, 15, 28, 0.8);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
    padding: 1rem 0;
}

.header-container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.brand-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-family: 'Outfit', sans-serif;
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text-primary);
}

.logo-icon {
    width: 32px;
    height: 32px;
    color: var(--neon-blue);
    filter: drop-shadow(0 0 6px var(--neon-blue-glow));
}

.logo-img {
    width: 36px;
    height: 36px;
    object-fit: contain;
    filter: drop-shadow(0 0 4px rgba(0, 164, 228, 0.4));
}

.logo-text span {
    color: var(--neon-blue);
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.5rem;
    cursor: pointer;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.nav-link {
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-link:hover {
    color: #fff;
}

.app-main-content {
    flex: 1;
    width: 90%;
    max-width: 1200px;
    margin: 2rem auto;
}

.app-footer-bar {
    background-color: rgba(10, 15, 28, 0.6);
    border-top: 1px solid var(--border-color);
    padding: 1.5rem 0;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.footer-container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-links {
    display: flex;
    gap: 1.5rem;
}

.footer-links a {
    color: var(--text-muted);
}

.footer-links a:hover {
    color: #fff;
}

/* ==========================================================================
   UI Components (Premium Glassmorphism & Animations)
   ========================================================================== */
.glassmorphic {
    background: var(--bg-card);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    box-shadow: var(--shadow-premium);
    transition: var(--transition-smooth);
}

.glassmorphic:hover {
    border-color: var(--border-hover);
    transform: translateY(-2px);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 0.95rem;
    border: none;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.btn-primary {
    background-color: var(--neon-blue);
    color: #0b0f1c;
    box-shadow: 0 0 15px var(--neon-blue-glow);
}

.btn-primary:hover {
    background-color: #fff;
    box-shadow: 0 0 25px rgba(255, 255, 255, 0.4);
    transform: scale(1.02);
}

.btn-secondary {
    background-color: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover:not(:disabled) {
    background-color: rgba(255, 255, 255, 0.15);
    border-color: var(--border-hover);
}

.btn-block {
    display: flex;
    width: 100%;
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.1rem;
}

.btn-sm {
    padding: 0.4rem 0.8rem;
    font-size: 0.85rem;
}

/* ==========================================================================
   Animations
   ========================================================================== */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

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

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-8px); }
}

.animate-fade-in { animation: fadeIn 0.6s ease-out; }
.animate-slide-in { animation: slideIn 0.5s cubic-bezier(0.16, 1, 0.3, 1) forwards; }
.animate-bounce { animation: bounce 2s infinite ease-in-out; }

/* ==========================================================================
   User Authentication (login/register)
   ========================================================================== */
.auth-wrapper {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 70vh;
    padding: 2rem 0;
}

.auth-card {
    width: 100%;
    max-width: 480px;
    padding: 2.5rem;
}

.auth-header {
    text-align: center;
    margin-bottom: 2rem;
}

.auth-header h2 {
    font-size: 2.2rem;
    font-weight: 800;
}

.auth-header p {
    color: var(--text-secondary);
}

.auth-form .form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.input-wrapper {
    position: relative;
}

.input-icon {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    width: 18px;
    height: 18px;
    color: var(--text-muted);
}

.form-control,
.input-wrapper input,
.form-group select {
    width: 100%;
    padding: 0.75rem 1rem 0.75rem 2.8rem;
    background-color: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: #fff;
    font-size: 0.95rem;
    transition: var(--transition-smooth);
}

.form-group select {
    padding-left: 1rem; /* standard padding for select */
    appearance: none;
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    background-size: 1.25em;
}

.form-control:focus,
.input-wrapper input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--neon-blue);
    box-shadow: 0 0 10px var(--neon-blue-glow);
}

.form-hint {
    display: block;
    margin-top: 0.4rem;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.auth-footer {
    margin-top: 1.5rem;
    text-align: center;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* Error messages list */
.error-container {
    background-color: var(--neon-red-glow);
    border: 1px solid var(--neon-red);
    border-radius: var(--radius-sm);
    padding: 1rem;
    margin-bottom: 1.5rem;
}

.error-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: #ff8080;
    font-size: 0.85rem;
    margin-bottom: 0.5rem;
}

.error-item:last-child {
    margin-bottom: 0;
}

.error-icon {
    width: 16px;
    height: 16px;
}

/* ==========================================================================
   Dashboard Page
   ========================================================================== */
.dashboard-header-section {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1.5rem;
}

.xp-display {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.75rem 1.5rem;
}

.xp-icon {
    width: 32px;
    height: 32px;
    color: var(--gold);
}

.xp-val {
    display: block;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--gold);
}

.xp-level {
    display: block;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.streak-badge {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.75rem 1.5rem;
    border-color: var(--gold);
    box-shadow: 0 0 15px var(--gold-glow);
}

.streak-icon {
    width: 32px;
    height: 32px;
    color: var(--gold);
    filter: drop-shadow(0 0 6px var(--gold-glow));
}

.streak-val {
    display: block;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--gold);
}

.streak-desc {
    display: block;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 1.5rem;
}

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

.stat-title {
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
}

.stat-icon {
    width: 24px;
    height: 24px;
}

.color-blue { color: var(--neon-blue); }
.color-purple { color: hsl(270, 85%, 65%); }
.color-gold { color: var(--gold); }
.color-green { color: var(--neon-green); }
.color-red { color: var(--neon-red); }

.stat-value {
    font-size: 2.2rem;
    font-weight: 700;
    font-family: 'Outfit', sans-serif;
    margin-bottom: 0.25rem;
}

.stat-desc {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.xp-progress {
    margin-top: 1rem;
}

.xp-num-label {
    display: block;
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: 0.4rem;
}

.progress-bar-bg {
    background-color: rgba(255, 255, 255, 0.08);
    height: 8px;
    border-radius: 4px;
    overflow: hidden;
}

.progress-bar-fill {
    background-color: var(--gold);
    height: 100%;
    border-radius: 4px;
    box-shadow: 0 0 10px var(--gold-glow);
    transition: width 0.5s ease-out;
}

/* AI Diagnostics layout */
.ai-grid {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 1.5rem;
    margin-top: 1rem;
}

.ai-card h3 {
    margin-bottom: 0.25rem;
}

.ai-card-sub {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.gauge-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 1rem 0;
}

/* Circular radial ring gauge */
.probability-circle {
    width: 140px;
    height: 140px;
    border-radius: 50%;
    display: grid;
    place-items: center;
    box-shadow: var(--shadow-premium);
}

.probability-value {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.prob-num {
    font-family: 'Outfit', sans-serif;
    font-size: 2.2rem;
    font-weight: 800;
}

.prob-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
}

.empty-ai-state {
    text-align: center;
    padding: 2rem 1rem;
    color: var(--text-muted);
}

.empty-icon-sm {
    width: 48px;
    height: 48px;
    opacity: 0.4;
    margin-bottom: 0.5rem;
}

.weak-topics-list {
    list-style: none;
}

.weak-topic-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

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

.weak-topic-meta {
    display: flex;
    flex-direction: column;
}

.topic-name {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
}

.wrong-answers-badge {
    font-size: 0.8rem;
    color: var(--neon-red);
    margin-left: 1.5rem;
}

/* Badges section */
.badges-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1rem;
}

.badge-card {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.badge-icon-wrapper {
    background: rgba(255, 215, 0, 0.05);
    border: 1px solid rgba(255, 215, 0, 0.15);
    border-radius: 50%;
    width: 54px;
    height: 54px;
    display: grid;
    place-items: center;
    flex-shrink: 0;
}

.badge-icon {
    width: 28px;
    height: 28px;
}

.badge-body h4 {
    margin-bottom: 0.15rem;
}

.badge-body p {
    font-size: 0.8rem;
    color: var(--text-secondary);
    line-height: 1.3;
}

.badge-awarded-date {
    display: block;
    margin-top: 0.25rem;
    font-size: 0.7rem;
    color: var(--text-muted);
}

/* User package status tags */
.user-package-tag {
    font-size: 0.75rem;
    font-weight: 700;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    text-transform: uppercase;
}

.tag-free { background-color: rgba(255, 255, 255, 0.1); color: var(--text-secondary); }
.tag-starter { background-color: rgba(0, 200, 255, 0.15); color: var(--neon-blue); border: 1px solid var(--neon-blue); }
.tag-intermediate { background-color: rgba(255, 165, 0, 0.15); color: var(--gold); border: 1px solid var(--gold); }
.tag-premium { background-color: rgba(0, 255, 120, 0.15); color: var(--neon-green); border: 1px solid var(--neon-green); }
.tag-ultimate { background-color: rgba(255, 0, 100, 0.15); color: var(--neon-red); border: 1px solid var(--neon-red); }

/* ==========================================================================
   Lessons Listing & view page
   ========================================================================== */
.lessons-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 1.5rem;
}

.lesson-card {
    display: flex;
    flex-direction: column;
}

.lesson-icon-wrapper {
    background: rgba(255, 255, 255, 0.03);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    height: 100px;
    display: grid;
    place-items: center;
    border-top-left-radius: var(--radius-md);
    border-top-right-radius: var(--radius-md);
}

.lesson-card-icon {
    width: 36px;
    height: 36px;
    color: var(--neon-blue);
}

.lesson-card-body {
    padding: 1.5rem;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.lesson-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.lesson-num {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
}

.lesson-card h3 {
    margin-bottom: 0.5rem;
}

.lesson-card p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    flex: 1;
}

/* Locked lesson state */
.lesson-card.locked {
    opacity: 0.6;
}

.lesson-card.locked .lesson-card-icon {
    color: var(--text-muted);
}

/* Completed badge styling */
.status-tag {
    font-size: 0.75rem;
    font-weight: 700;
    padding: 0.15rem 0.4rem;
    border-radius: 4px;
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
}

.pass {
    background-color: rgba(0, 255, 120, 0.1);
    color: var(--neon-green);
    border: 1px solid var(--neon-green);
}

.fail {
    background-color: rgba(255, 0, 100, 0.1);
    color: var(--neon-red);
    border: 1px solid var(--neon-red);
}

.info {
    background-color: rgba(0, 200, 255, 0.1);
    color: var(--neon-blue);
    border: 1px solid var(--neon-blue);
}

.inline-icon {
    width: 14px;
    height: 14px;
}

/* Single lesson page */
.back-nav {
    margin-bottom: 1.5rem;
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
}

.lesson-view-container {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.lesson-article {
    padding: 2.5rem;
}

.lesson-header {
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1.5rem;
    margin-bottom: 2rem;
}

.lesson-header h1 {
    font-size: 2.5rem;
}

.topic-meta {
    color: var(--text-secondary);
}

.lesson-content h2 {
    font-size: 1.6rem;
    margin-top: 1.5rem;
    margin-bottom: 0.75rem;
    border-left: 4px solid var(--neon-blue);
    padding-left: 0.75rem;
}

.lesson-content h3 {
    font-size: 1.25rem;
    margin-top: 1.25rem;
    margin-bottom: 0.5rem;
}

.lesson-content p {
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

.lesson-content ul,
.lesson-content ol {
    margin-bottom: 1.5rem;
    margin-left: 1.5rem;
    color: var(--text-secondary);
}

.lesson-content li {
    margin-bottom: 0.5rem;
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1rem;
    margin: 1.5rem 0;
}

.topic-card {
    background-color: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 1.25rem;
}

.topic-card h3 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    color: var(--neon-blue);
}

.topic-card.border-red { border-top: 3px solid var(--neon-red); }
.topic-card.border-blue { border-top: 3px solid var(--neon-blue); }
.topic-card.border-green { border-top: 3px solid var(--neon-green); }

/* Data tables */
.data-table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5rem 0;
    font-size: 0.95rem;
}

.data-table th,
.data-table td {
    padding: 0.75rem 1rem;
    text-align: left;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.data-table th {
    background-color: rgba(255, 255, 255, 0.03);
    font-weight: 700;
    color: var(--text-secondary);
}

.data-table tr:hover {
    background-color: rgba(255, 255, 255, 0.01);
}

/* Practice quiz card */
.quiz-card {
    background-color: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.quiz-card h4 {
    margin-bottom: 1rem;
}

.quiz-options {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.quiz-opt-btn {
    background: rgba(255,255,255,0.03);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    text-align: left;
    padding: 0.75rem 1rem;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    cursor: pointer;
    transition: var(--transition-smooth);
    display: flex;
    align-items: center;
    gap: 1rem;
    width: 100%;
}

.quiz-opt-btn:hover:not(:disabled) {
    background: rgba(255,255,255,0.1);
    border-color: var(--neon-blue);
}

.opt-letter {
    background-color: rgba(255,255,255,0.1);
    border-radius: 4px;
    padding: 0.2rem 0.5rem;
    font-weight: 700;
    font-family: 'Outfit', sans-serif;
}

.quiz-opt-btn.correct {
    background-color: var(--neon-green-glow);
    border-color: var(--neon-green);
    color: #fff;
}

.quiz-opt-btn.correct .opt-letter {
    background-color: var(--neon-green);
    color: #fff;
}

.quiz-opt-btn.incorrect {
    background-color: var(--neon-red-glow);
    border-color: var(--neon-red);
    color: #fff;
}

.quiz-opt-btn.incorrect .opt-letter {
    background-color: var(--neon-red);
    color: #fff;
}

.quiz-feedback-box {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid rgba(255,255,255,0.05);
}

.feedback-explanation {
    margin-top: 0.5rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.hidden {
    display: none !important;
}

/* ==========================================================================
   Practice Test Simulator Page
   ========================================================================== */
.rules-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.rule-box {
    display: flex;
    gap: 1rem;
}

.rule-box i {
    width: 28px;
    height: 28px;
    color: var(--neon-blue);
    flex-shrink: 0;
}

.rule-box h4 {
    margin-bottom: 0.25rem;
}

.rule-box p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.3;
}

.payment-lock-card {
    text-align: center;
    padding: 2.5rem;
    border: 1px solid var(--border-color);
    background-color: rgba(255,255,255,0.01);
    border-radius: var(--radius-md);
}

.lock-icon-lg {
    width: 64px;
    height: 64px;
    color: var(--text-muted);
    margin-bottom: 1rem;
}

/* Practice Exam in progress */
.test-run-wrapper {
    display: grid;
    grid-template-columns: 320px 1fr;
    gap: 2rem;
    align-items: start;
}

.test-side-panel {
    position: sticky;
    top: 6rem;
    text-align: center;
}

.timer-display {
    font-family: 'Outfit', sans-serif;
    font-size: 3rem;
    font-weight: 800;
    color: var(--text-primary);
    margin: 1rem 0;
}

.timer-warning {
    color: var(--neon-red);
    text-shadow: 0 0 10px var(--neon-red-glow);
    animation: bounce 1s infinite;
}

.question-jump-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 0.4rem;
    margin: 1.5rem 0;
}

.jump-btn {
    background-color: rgba(255,255,255,0.03);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    height: 40px;
    border-radius: 4px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.jump-btn:hover {
    border-color: var(--neon-blue);
    color: #fff;
}

.jump-btn.answered {
    background-color: rgba(0, 200, 255, 0.15);
    border-color: var(--neon-blue);
    color: #fff;
}

.question-card {
    margin-bottom: 2rem;
}

.q-number {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
}

.q-text {
    font-size: 1.15rem;
    font-weight: 500;
    margin-top: 0.5rem;
    margin-bottom: 1.5rem;
}

.q-options-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.q-opt-label {
    background-color: rgba(255,255,255,0.02);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 1rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.q-opt-label:hover {
    background-color: rgba(255,255,255,0.06);
    border-color: var(--border-hover);
}

.q-opt-label input[type="radio"] {
    accent-color: var(--neon-blue);
    width: 18px;
    height: 18px;
}

.q-opt-letter {
    background-color: rgba(255,255,255,0.08);
    border-radius: 4px;
    padding: 0.25rem 0.5rem;
    font-weight: 700;
    font-family: 'Outfit', sans-serif;
}

/* Result hero page */
.result-hero-card {
    display: flex;
    align-items: center;
    gap: 3rem;
    padding: 3rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-premium);
}

.result-hero-card.pass {
    background: radial-gradient(circle at top right, var(--bg-card), hsla(142, 72%, 45%, 0.15));
    border: 1px solid var(--neon-green);
}

.result-hero-card.fail {
    background: radial-gradient(circle at top right, var(--bg-card), hsla(352, 75%, 50%, 0.15));
    border: 1px solid var(--neon-red);
}

.hero-icon {
    width: 80px;
    height: 80px;
}

.result-hero-card.pass .hero-icon { color: var(--neon-green); }
.result-hero-card.fail .hero-icon { color: var(--neon-red); }

.result-status-title {
    font-family: 'Outfit', sans-serif;
    font-size: 1.25rem;
    font-weight: 800;
    letter-spacing: 0.05em;
}

.score-main {
    font-family: 'Outfit', sans-serif;
    font-size: 4rem;
    font-weight: 800;
    margin: 0.5rem 0;
}

.score-total {
    font-size: 1.5rem;
    color: var(--text-secondary);
}

/* Detailed diagnostics list */
.revision-card {
    margin-bottom: 1.5rem;
}

.revision-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.wrong-topic-tag {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.revision-question-text {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 1.25rem;
}

.revision-options-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 0.75rem;
    margin-bottom: 1.25rem;
}

.rev-opt {
    background-color: rgba(255,255,255,0.02);
    border: 1px solid var(--border-color);
    padding: 0.75rem 1rem;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
}

.rev-opt.correct {
    background-color: var(--neon-green-glow);
    border-color: var(--neon-green);
    color: #fff;
    font-weight: 600;
}

.rev-opt.user-selected {
    border-color: var(--neon-red);
    position: relative;
}

.rev-opt.user-selected::after {
    content: "Your Answer";
    position: absolute;
    right: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    font-size: 0.65rem;
    font-weight: 700;
    color: var(--neon-red);
    text-transform: uppercase;
}

.rev-opt.user-selected.correct::after {
    content: "Correct!";
    color: var(--neon-green);
}

.revision-explanation-box {
    background-color: rgba(255, 255, 255, 0.03);
    border-radius: var(--radius-sm);
    padding: 1rem;
    display: flex;
    gap: 0.75rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.4;
}

.revision-explanation-box i {
    width: 20px;
    height: 20px;
    color: var(--neon-blue);
    flex-shrink: 0;
}

/* ==========================================================================
   Monetization / Pricing Tiers Page
   ========================================================================== */
.pricing-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1.5rem;
    align-items: stretch;
}

.pricing-card {
    display: flex;
    flex-direction: column;
    padding: 2rem;
    position: relative;
}

.pricing-card.popular {
    border-color: var(--neon-blue);
    box-shadow: 0 0 25px var(--neon-blue-glow);
}

.popular-ribbon {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background-color: var(--neon-blue);
    color: #0b0f1c;
    font-size: 0.75rem;
    font-weight: 800;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    text-transform: uppercase;
}

.pricing-card.current {
    border-color: var(--neon-green);
    box-shadow: 0 0 15px var(--neon-green-glow);
}

.pricing-card h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
}

.price-box {
    margin-bottom: 2rem;
    display: flex;
    align-items: baseline;
}

.price-currency {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-secondary);
}

.price-amount {
    font-family: 'Outfit', sans-serif;
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1;
}

.price-term {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-left: 0.5rem;
}

.pricing-features {
    list-style: none;
    margin-bottom: 2rem;
    flex: 1;
}

.pricing-features li {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* Payment guide instruction box */
.instructions-placeholder {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.instructions-placeholder h4 {
    margin-bottom: 0.75rem;
    color: var(--neon-blue);
}

.instructions-placeholder p {
    margin-bottom: 0.75rem;
}

.instructions-placeholder strong {
    color: #fff;
}

/* ==========================================================================
   AI Revision Coach Chat UI
   ========================================================================== */
.chat-container-layout {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 1.5rem;
    height: 70vh;
}

.chat-sidebar {
    padding: 1.5rem;
}

.chat-sidebar h3 {
    font-size: 1.1rem;
    border-bottom: 1px solid rgba(255,255,255,0.08);
    padding-bottom: 0.5rem;
    margin-bottom: 1rem;
}

.sidebar-info {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.prompt-buttons {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.prompt-btn {
    background-color: rgba(255,255,255,0.02);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 0.6rem 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    text-align: left;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.prompt-btn:hover {
    border-color: var(--neon-blue);
    background-color: rgba(255,255,255,0.05);
    color: #fff;
}

.chat-main {
    display: flex;
    flex-direction: column;
    height: 100%;
}

.chat-messages-box {
    flex: 1;
    overflow-y: auto;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.chat-message {
    display: flex;
    gap: 1rem;
    max-width: 80%;
}

.chat-message.bot {
    align-self: flex-start;
}

.chat-message.user {
    align-self: flex-end;
    flex-direction: row-reverse;
}

.msg-avatar {
    background: rgba(255,255,255,0.03);
    border: 1px solid var(--border-color);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: grid;
    place-items: center;
    flex-shrink: 0;
}

.chat-message.bot .msg-avatar {
    color: var(--neon-blue);
    border-color: var(--neon-blue);
}

.chat-message.user .msg-avatar {
    color: var(--gold);
    border-color: var(--gold);
}

.msg-bubble {
    background-color: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
    padding: 1rem 1.25rem;
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    line-height: 1.4;
}

.chat-message.user .msg-bubble {
    background-color: rgba(0, 200, 255, 0.08);
    border-color: var(--neon-blue);
}

.msg-bubble h4 {
    color: var(--neon-blue);
    margin-bottom: 0.5rem;
}

.msg-bubble ul,
.msg-bubble ol {
    margin-left: 1.25rem;
    margin-top: 0.5rem;
}

.msg-bubble li {
    margin-bottom: 0.25rem;
}

/* Typing indicator dots */
.typing {
    display: flex;
    align-items: center;
    gap: 0.3rem;
    height: 40px;
    padding: 0 1.25rem;
}

.dot {
    width: 6px;
    height: 6px;
    background-color: var(--text-secondary);
    border-radius: 50%;
    animation: typing-dot 1.4s infinite ease-in-out;
}

.dot:nth-child(2) { animation-delay: 0.2s; }
.dot:nth-child(3) { animation-delay: 0.4s; }

@keyframes typing-dot {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-5px); }
}

.chat-input-area {
    padding: 1rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: 0.75rem;
}

.chat-input-area input {
    flex: 1;
    background-color: rgba(0,0,0,0.2);
    border: 1px solid var(--border-color);
    color: #fff;
    padding: 0.75rem 1rem;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
}

.chat-input-area input:focus {
    outline: none;
    border-color: var(--neon-blue);
}

/* ==========================================================================
   Responsive Alerts & Banners
   ========================================================================== */
.alert-success {
    background-color: var(--neon-green-glow);
    border: 1px solid var(--neon-green);
    border-radius: var(--radius-sm);
    padding: 1rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: #b3ffd9;
    font-size: 0.9rem;
}

.alert-success i {
    color: var(--neon-green);
    flex-shrink: 0;
}

.alert-badge-earned {
    background-color: var(--gold-glow);
    border: 1px solid var(--gold);
    border-radius: var(--radius-sm);
    padding: 1rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: #ffeb99;
    font-size: 0.95rem;
    font-weight: 600;
}

.alert-badge-earned i {
    color: var(--gold);
    flex-shrink: 0;
}

.alert-fail {
    background-color: var(--neon-red-glow);
    border: 1px solid var(--neon-red);
    border-radius: var(--radius-sm);
    padding: 1rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: #ffb3b3;
    font-size: 0.9rem;
}

.alert-fail i {
    color: var(--neon-red);
    flex-shrink: 0;
}

/* Status badges inside tables */
.status-badge {
    font-size: 0.75rem;
    font-weight: 700;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    display: inline-block;
}

.status-badge.pass { background-color: rgba(0, 255, 120, 0.15); color: var(--neon-green); border: 1px solid var(--neon-green); }
.status-badge.fail { background-color: rgba(255, 0, 100, 0.15); color: var(--neon-red); border: 1px solid var(--neon-red); }

.status-badge-inline {
    font-size: 0.85rem;
    font-weight: 700;
    padding: 0.25rem 0.6rem;
    border-radius: 4px;
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
}

.status-badge-inline.pass { background-color: rgba(0, 255, 120, 0.1); color: var(--neon-green); border: 1px solid var(--neon-green); }
.status-badge-inline.fail { background-color: rgba(255, 0, 100, 0.1); color: var(--neon-red); border: 1px solid var(--neon-red); }

/* Table responsive utility */
.table-responsive {
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.topic-label {
    font-size: 0.75rem;
    font-weight: 600;
    background-color: rgba(255,255,255,0.05);
    border: 1px solid var(--border-color);
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    color: var(--text-secondary);
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */
@media (max-width: 900px) {
    .test-run-wrapper {
        grid-template-columns: 1fr;
    }
    
    .test-side-panel {
        position: relative;
        top: 0;
        margin-bottom: 1.5rem;
    }
    
    .chat-container-layout {
        grid-template-columns: 1fr;
        height: auto;
    }
    
    .chat-sidebar {
        display: none; /* Hide chat prompts on small mobile layout */
    }
}

@media (max-width: 768px) {
    .header-container {
        position: relative;
    }
    
    .menu-toggle {
        display: block;
    }
    
    .nav-menu {
        display: none;
        flex-direction: column;
        width: 100%;
        background-color: rgb(10, 15, 28);
        border-top: 1px solid var(--border-color);
        position: absolute;
        top: 100%;
        left: 0;
        padding: 1.5rem;
        gap: 1.25rem;
        box-shadow: var(--shadow-premium);
    }
    
    .nav-menu.active {
        display: flex;
    }
    
    .user-nav-status {
        flex-direction: column;
        width: 100%;
        gap: 1rem;
    }
    
    .upgrade-btn {
        width: 100%;
        text-align: center;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .ai-grid {
        grid-template-columns: 1fr;
    }
    
    .result-hero-card {
        flex-direction: column;
        gap: 1.5rem;
        text-align: center;
        padding: 2rem;
    }
    
    .footer-container {
        flex-direction: column;
        gap: 1rem;
    }
}

/* ==========================================================================
   Landing Page Layout Styles
   ========================================================================== */
.landing-wrapper {
    display: flex;
    flex-direction: column;
    gap: 4rem;
    padding: 1rem 0;
}

.landing-hero {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 3rem;
    align-items: center;
    min-height: 60vh;
}

.hero-content {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.hero-badge {
    background: rgba(0, 200, 255, 0.1);
    color: var(--neon-blue);
    border: 1px solid var(--neon-blue);
    padding: 0.4rem 0.8rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
}

.landing-hero h1 {
    font-size: 3.5rem;
    line-height: 1.15;
    margin-bottom: 1.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, #fff 0%, var(--neon-blue) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
    line-height: 1.6;
    max-width: 580px;
}

.hero-actions {
    display: flex;
    gap: 1rem;
    width: 100%;
}

.hero-preview {
    border-radius: var(--radius-lg);
    overflow: hidden;
    padding: 0;
}

.preview-header {
    background: rgba(0, 0, 0, 0.3);
    padding: 0.75rem 1.25rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    border-bottom: 1px solid var(--border-color);
}

.preview-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}
.preview-dot.red { background-color: var(--neon-red); }
.preview-dot.yellow { background-color: var(--gold); }
.preview-dot.green { background-color: var(--neon-green); }

.preview-title {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 600;
    margin-left: 0.5rem;
    text-transform: uppercase;
}

.preview-body {
    padding: 2rem;
}

.preview-timer {
    font-family: 'Outfit', sans-serif;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--neon-red);
    display: flex;
    align-items: center;
    gap: 0.4rem;
    margin-bottom: 1rem;
}

.preview-progress {
    margin-bottom: 1.5rem;
}

.preview-progress span {
    font-size: 0.8rem;
    color: var(--text-secondary);
    display: block;
    margin-bottom: 0.4rem;
}

.preview-q {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
}

.preview-opts {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.preview-opt {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
    padding: 0.75rem 1rem;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.preview-opt.correct {
    border-color: var(--neon-green);
    background: var(--neon-green-glow);
    color: #fff;
    font-weight: 600;
}

.section-title {
    font-size: 2.5rem;
    text-align: center;
    font-weight: 800;
}

.section-subtitle {
    text-align: center;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0.5rem auto 0 auto;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1.5rem;
}

.feature-card {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.feature-icon-wrapper {
    width: 50px;
    height: 50px;
    border-radius: var(--radius-md);
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
    display: grid;
    place-items: center;
    margin-bottom: 1.5rem;
}

.feature-icon-wrapper i {
    width: 24px;
    height: 24px;
}

.feature-icon-wrapper img.feature-card-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: var(--radius-md);
}

.feature-card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
}

.feature-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.inline-icon {
    width: 16px;
    height: 16px;
    vertical-align: middle;
}

@media (max-width: 992px) {
    .landing-hero {
        grid-template-columns: 1fr;
        gap: 3rem;
        text-align: center;
    }
    
    .hero-content {
        align-items: center;
    }
    
    .landing-hero h1 {
        font-size: 2.75rem;
    }
    
    .hero-subtitle {
        margin-bottom: 2rem;
    }
    
    .hero-actions {
        justify-content: center;
        flex-direction: column;
    }
}

/* ==========================================================================
   Interactive Diagram Layout Styles
   ========================================================================== */
.q-diagram-placeholder {
    margin: 1.5rem 0;
    width: 100%;
}

.diagram-card {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

.diagram-card-header {
    background: rgba(0, 0, 0, 0.2);
    padding: 0.75rem 1.25rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
}

.diagram-title-box {
    display: flex;
    flex-direction: column;
}

.diagram-tag {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--neon-blue);
    font-weight: 700;
}

.diagram-card-header h4 {
    font-size: 1rem;
    margin: 0;
    color: var(--text-primary);
}

.diagram-signs {
    display: flex;
    gap: 0.5rem;
}

.sign-tag {
    font-size: 0.75rem;
    font-weight: 700;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
}

.sign-tag.stop { background-color: rgba(255, 77, 77, 0.15); color: var(--neon-red); border: 1px solid var(--neon-red); }
.sign-tag.danger { background-color: rgba(255, 165, 0, 0.15); color: var(--gold); border: 1px solid var(--gold); }
.sign-tag.circle { background-color: rgba(0, 200, 255, 0.15); color: var(--neon-blue); border: 1px solid var(--neon-blue); }
.sign-tag.info { background-color: rgba(255, 255, 255, 0.08); color: var(--text-secondary); border: 1px solid var(--border-color); }
.sign-tag.pass { background-color: rgba(46, 204, 113, 0.15); color: var(--neon-green); border: 1px solid var(--neon-green); }

.diagram-card-body {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    padding: 1.5rem;
    align-items: center;
}

.diagram-svg-col {
    background-color: #1a1a24;
    border-radius: var(--radius-sm);
    padding: 1rem;
    border: 1px solid rgba(255, 255, 255, 0.04);
    display: flex;
    justify-content: center;
    align-items: center;
}

.diagram-svg-element {
    width: 100%;
    max-width: 280px;
    height: auto;
}

.diagram-vehicle-g {
    cursor: pointer;
    transition: filter 0.2s ease;
}

.diagram-vehicle-g .veh-rect {
    transition: stroke-width 0.2s ease, filter 0.2s ease;
}

.diagram-vehicle-g.highlighted .veh-rect {
    stroke-width: 3px !important;
    filter: drop-shadow(0 0 8px rgba(255, 255, 255, 0.6));
}

.diagram-vehicle-g.active-moving .veh-rect {
    stroke-width: 3px !important;
    filter: drop-shadow(0 0 10px rgba(0, 200, 255, 0.8));
    animation: pulseGlow 1s infinite alternate;
}

@keyframes pulseGlow {
    from { filter: drop-shadow(0 0 4px rgba(0, 200, 255, 0.4)); }
    to { filter: drop-shadow(0 0 12px rgba(0, 200, 255, 0.9)); }
}

.diagram-info-col {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    height: 100%;
    min-height: 180px;
}

.diagram-explanation-panel {
    background: rgba(0, 0, 0, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.04);
    border-radius: var(--radius-sm);
    padding: 1rem;
    flex-grow: 1;
    margin-bottom: 1rem;
}

.diagram-explanation-panel h5 {
    font-size: 0.9rem;
    text-transform: uppercase;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    padding-bottom: 0.25rem;
}

.explanation-default-text {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.vehicle-details-box {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    animation: fadeIn 0.3s ease-out;
}

.active-vehicle-label {
    font-family: 'Outfit', sans-serif;
    font-size: 0.8rem;
    font-weight: 800;
    color: #fff;
    padding: 0.15rem 0.5rem;
    border-radius: 4px;
    align-self: flex-start;
    text-transform: uppercase;
}

.active-vehicle-desc {
    font-size: 0.85rem;
    color: var(--text-primary);
    line-height: 1.4;
}

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

.glassmorphic-sub {
    background: rgba(255, 255, 255, 0.03);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-premium);
}

@media (max-width: 600px) {
    .diagram-card-body {
        grid-template-columns: 1fr;
        gap: 1rem;
        padding: 1rem;
    }
    
    .diagram-info-col {
        min-height: auto;
    }
}

/* Glowing correct answer styling for interactive diagrams */
.correct-answer-glow {
    filter: drop-shadow(0 0 8px rgba(253, 185, 19, 0.85));
    animation: correct-pulse-glow 2.5s infinite ease-in-out;
}

@keyframes correct-pulse-glow {
    0% { filter: drop-shadow(0 0 4px rgba(253, 185, 19, 0.5)); }
    50% { filter: drop-shadow(0 0 14px rgba(253, 185, 19, 0.95)); }
    100% { filter: drop-shadow(0 0 4px rgba(253, 185, 19, 0.5)); }
}

/* ==========================================================================
   OAuth Social Authentication Styles
   ========================================================================== */
.social-auth-divider {
    text-align: center;
    margin: 1.5rem 0;
    position: relative;
}

.social-auth-divider::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    width: 100%;
    height: 1px;
    background: var(--border-color);
    z-index: 1;
}

.social-auth-divider span {
    background: #0f131a; /* Matches body background */
    padding: 0 10px;
    font-size: 0.85rem;
    color: var(--text-muted);
    position: relative;
    z-index: 2;
}

.social-auth-buttons {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.btn-social {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.8rem 1rem;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    text-decoration: none;
    transition: var(--transition-smooth);
}

.btn-social .social-icon {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

.btn-social:hover {
    background: rgba(255, 255, 255, 0.08);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

/* Brand hover highlights */
.btn-social.google:hover {
    border-color: #4285F4;
    color: #4285F4;
    box-shadow: 0 0 15px rgba(66, 133, 244, 0.25);
}

.btn-social.microsoft:hover {
    border-color: #00a4ef;
    color: #00a4ef;
    box-shadow: 0 0 15px rgba(0, 164, 239, 0.25);
}

.btn-social.apple:hover {
    border-color: #ffffff;
    color: #ffffff;
    background-color: rgba(255, 255, 255, 0.08);
    box-shadow: 0 0 15px rgba(255, 255, 255, 0.15);
}

.highlight-pending-row {
    background-color: rgba(253, 185, 19, 0.02) !important;
    border-left: 3px solid var(--gold);
}