/* ==========================================================================
   🎖️ NDA (NATIONAL DEFENCE ACADEMY) EXAM HUB - PREMIUM STYLESHEET
   ========================================================================== */

:root {
    --primary-color: #0d9488; /* Teal / Sea Green represent Navy/Air Force */
    --secondary-color: #0f766e; /* Deep Teal */
    --accent-color: #f59e0b; /* Saffron/Gold */
    --success-color: #10b981;
    --warning-color: #f97316;
    --danger-color: #ef4444;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-tertiary: #64748b;
    --card-bg: rgba(15, 23, 42, 0.7);
    --border-color: rgba(148, 163, 184, 0.1);
    
    /* Tri-Service Theme Colors */
    --army-color: #15803d;     /* Olive/Forest Green */
    --navy-color: #1d4ed8;     /* Navy Blue */
    --airforce-color: #06b6d4; /* Sky Blue */
}

[data-theme="light"] {
    --text-primary: #1e293b;
    --text-secondary: #475569;
    --text-tertiary: #64748b;
    --card-bg: rgba(255, 255, 255, 0.9);
    --border-color: rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: 'Outfit', sans-serif;
    background: linear-gradient(135deg, #020617 0%, #0f172a 50%, #042f2e 100%);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    transition: background 0.3s, color 0.3s;
}

/* Particle Canvas */
#particleCanvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    pointer-events: none;
}

/* Navigation */
.glass-nav {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(15, 23, 42, 0.85);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    padding: 0.75rem 1rem;
}

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

.nav-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
}

.logo-image {
    width: 36px;
    height: 36px;
    border-radius: 10px;
}

.logo-text {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text-primary);
}

.nav-breadcrumb {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
}

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

.breadcrumb-link {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s;
}

.breadcrumb-link:hover {
    color: var(--primary-color);
}

.breadcrumb-current {
    color: var(--text-primary);
    font-weight: 600;
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.xp-display {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    background: rgba(13, 148, 136, 0.15);
    padding: 0.4rem 0.75rem;
    border-radius: 20px;
    border: 1px solid rgba(13, 148, 136, 0.3);
}

.xp-icon {
    font-size: 1rem;
}

.xp-count {
    font-weight: 700;
    color: var(--primary-color);
}

.xp-label {
    font-size: 0.75rem;
    color: var(--text-tertiary);
}

.theme-toggle {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 0.5rem;
    cursor: pointer;
    transition: all 0.3s;
}

.theme-toggle:hover {
    background: rgba(255, 255, 255, 0.1);
}

.theme-icon {
    font-size: 1.2rem;
}

/* Hero Section */
.nda-hero {
    position: relative;
    padding: 4rem 1rem 5rem;
    text-align: center;
    overflow: hidden;
}

.hero-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(13, 148, 136, 0.2), transparent 70%);
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 900px;
    margin: 0 auto;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: linear-gradient(135deg, rgba(21, 128, 61, 0.2), rgba(29, 78, 216, 0.2));
    border: 1px solid rgba(13, 148, 136, 0.3);
    padding: 0.5rem 1.2rem;
    border-radius: 30px;
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    color: var(--accent-color);
}

.badge-icon {
    font-size: 1.2rem;
}

.nda-title {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
}

.title-main {
    background: linear-gradient(135deg, #fff 30%, var(--accent-color) 70%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.title-sub {
    display: block;
    font-size: clamp(1.2rem, 3vw, 1.8rem);
    font-weight: 600;
    color: var(--text-secondary);
    margin-top: 0.5rem;
}

.nda-tagline {
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 2.5rem;
    line-height: 1.6;
}

.hero-stats {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 2rem;
    max-width: 800px;
    margin: 0 auto;
}

.hero-stat {
    background: rgba(30, 41, 59, 0.4);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    padding: 1.25rem 2rem;
    border-radius: 20px;
    min-width: 160px;
    flex: 1 1 160px;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.stat-value {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--accent-color);
}

.stat-label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Tabs & Lang Toggle Container */
.nda-tabs-container {
    max-width: 1200px;
    margin: 0 auto 3rem;
    padding: 0 1rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    position: relative;
    z-index: 10;
}

@media (min-width: 768px) {
    .nda-tabs-container {
        flex-direction: row;
        align-items: center;
        justify-content: space-between;
    }
}

.nda-tabs {
    display: flex;
    gap: 0.5rem;
    overflow-x: auto;
    padding: 0.4rem;
    background: rgba(30, 41, 59, 0.4);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    scrollbar-width: none;
}

.nda-tabs::-webkit-scrollbar {
    display: none;
}

.nda-tab {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: transparent;
    border: none;
    padding: 0.75rem 1.25rem;
    border-radius: 12px;
    color: var(--text-secondary);
    font-family: inherit;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    white-space: nowrap;
    transition: all 0.3s;
}

.nda-tab:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.05);
}

.nda-tab.active {
    color: #fff;
    background: var(--primary-color);
    box-shadow: 0 4px 12px rgba(13, 148, 136, 0.3);
}

.update-dot {
    width: 6px;
    height: 6px;
    background: var(--danger-color);
    border-radius: 50%;
    margin-left: -2px;
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.5); opacity: 0.5; }
    100% { transform: scale(1); opacity: 1; }
}

.language-toggle {
    display: flex;
    background: rgba(30, 41, 59, 0.4);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    padding: 0.25rem;
    border-radius: 12px;
    align-self: flex-end;
}

@media (min-width: 768px) {
    .language-toggle {
        align-self: auto;
    }
}

.lang-btn {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    background: transparent;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    color: var(--text-secondary);
    font-family: inherit;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
}

.lang-btn.active {
    color: #fff;
    background: rgba(255, 255, 255, 0.1);
}

/* Content Container */
.tab-content {
    max-width: 1200px;
    margin: 0 auto 5rem;
    padding: 0 1rem;
    position: relative;
    z-index: 5;
}

.tab-panel {
    display: none;
    animation: fadeIn 0.5s ease-out;
}

.tab-panel.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(15px); }
    to { opacity: 1; transform: translateY(0); }
}

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

/* Cards Layout */
.info-card {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.card-header {
    padding: 1.5rem 2rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.card-header.army-header { background: linear-gradient(90deg, rgba(21, 128, 61, 0.15), transparent); }
.card-header.navy-header { background: linear-gradient(90deg, rgba(29, 78, 216, 0.15), transparent); }
.card-header.airforce-header { background: linear-gradient(90deg, rgba(6, 182, 212, 0.15), transparent); }

.card-icon {
    font-size: 1.5rem;
}

.card-header h2 {
    font-size: 1.35rem;
    font-weight: 700;
}

.card-body {
    padding: 2rem;
}

/* Updates panel custom styling */
.hero-update {
    position: relative;
    background: linear-gradient(135deg, rgba(13, 148, 136, 0.2) 0%, rgba(30, 41, 59, 0.6) 100%);
    border: 1px solid rgba(13, 148, 136, 0.3);
    border-radius: 24px;
    padding: 2.5rem;
    overflow: hidden;
}

.hero-update-pulse {
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
    width: 12px;
    height: 12px;
    background: #10b981;
    border-radius: 50%;
    box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
    animation: markerPulse 2s infinite;
}

@keyframes markerPulse {
    0% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.4); }
    70% { box-shadow: 0 0 0 10px rgba(16, 185, 129, 0); }
    100% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

.hero-update-content {
    max-width: 700px;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.update-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.35rem 0.75rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 700;
    align-self: flex-start;
}

.update-badge.live {
    background: rgba(16, 185, 129, 0.2);
    color: #34d399;
    border: 1px solid rgba(16, 185, 129, 0.3);
}

.live-dot {
    width: 6px;
    height: 6px;
    background: currentColor;
    border-radius: 50%;
    animation: pulse 1s infinite;
}

.hero-update-title {
    font-size: 1.75rem;
    font-weight: 800;
}

.hero-update-desc {
    color: var(--text-secondary);
    line-height: 1.6;
}

.hero-update-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    font-size: 0.85rem;
    color: var(--text-tertiary);
    font-weight: 500;
}

.hero-update-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--primary-color);
    color: #fff;
    text-decoration: none;
    padding: 0.8rem 1.5rem;
    border-radius: 12px;
    font-weight: 600;
    align-self: flex-start;
    margin-top: 0.5rem;
    transition: all 0.3s;
}

.hero-update-btn:hover {
    background: var(--secondary-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(13, 148, 136, 0.3);
}

.btn-arrow {
    transition: transform 0.3s;
}

.hero-update-btn:hover .btn-arrow {
    transform: translateX(4px);
}

/* Quick Status Cards */
.status-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.25rem;
}

.status-card {
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    padding: 1.5rem;
    border-radius: 20px;
    display: flex;
    align-items: center;
    gap: 1rem;
    position: relative;
}

.status-icon {
    font-size: 2rem;
    width: 50px;
    height: 50px;
    border-radius: 14px;
    background: rgba(255, 255, 255, 0.05);
    display: flex;
    align-items: center;
    justify-content: center;
}

.status-info {
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
}

.status-label {
    font-size: 0.8rem;
    color: var(--text-tertiary);
    text-transform: uppercase;
    font-weight: 600;
}

.status-value {
    font-weight: 700;
    font-size: 1.1rem;
}

.status-badge {
    position: absolute;
    top: 0.75rem;
    right: 0.75rem;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    padding: 0.2rem 0.5rem;
    border-radius: 6px;
}

.status-card.upcoming .status-badge { background: rgba(245, 158, 11, 0.15); color: #fbbf24; }
.status-card.completed .status-badge { background: rgba(148, 163, 184, 0.15); color: #cbd5e1; }
.status-card.ongoing .status-badge { background: rgba(16, 185, 129, 0.15); color: #34d399; }
.status-card.pending .status-badge { background: rgba(239, 68, 68, 0.15); color: #f87171; }

/* Timeline styling */
.updates-timeline-section {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.75rem;
}

.section-header h3 {
    font-size: 1.25rem;
    font-weight: 700;
}

.updates-count {
    font-size: 0.85rem;
    color: var(--text-tertiary);
}

.updates-timeline {
    position: relative;
    padding-left: 2rem;
    display: flex;
    flex-direction: column;
    gap: 2.5rem;
}

.updates-timeline::before {
    content: '';
    position: absolute;
    top: 5px;
    left: 7px;
    bottom: 5px;
    width: 2px;
    background: var(--border-color);
}

.timeline-item {
    position: relative;
}

.timeline-marker {
    position: absolute;
    left: -2rem;
    top: 5px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.marker-dot {
    width: 16px;
    height: 16px;
    background: var(--card-bg);
    border: 3px solid var(--border-color);
    border-radius: 50%;
    z-index: 2;
    transition: all 0.3s;
}

.timeline-item.new .marker-dot {
    border-color: var(--primary-color);
    background: var(--primary-color);
}

.timeline-content {
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    padding: 1.5rem;
    border-radius: 20px;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    transition: all 0.3s;
}

.timeline-content:hover {
    transform: translateX(5px);
    border-color: rgba(13, 148, 136, 0.2);
}

.timeline-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.timeline-badge {
    font-size: 0.7rem;
    font-weight: 700;
    padding: 0.2rem 0.5rem;
    border-radius: 6px;
    text-transform: uppercase;
}

.timeline-badge.new-badge { background: rgba(16, 185, 129, 0.2); color: #34d399; }
.timeline-badge.info-badge { background: rgba(59, 130, 246, 0.2); color: #60a5fa; }
.timeline-badge.alert-badge { background: rgba(245, 158, 11, 0.2); color: #fbbf24; }

.timeline-date {
    font-size: 0.85rem;
    color: var(--text-tertiary);
    font-weight: 500;
}

.timeline-title {
    font-size: 1.15rem;
    font-weight: 700;
}

.timeline-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* Eligibility & Overview grid */
.grid-2col {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
}

@media (min-width: 992px) {
    .grid-2col {
        grid-template-columns: 1.2fr 0.8fr;
    }
}

.about-box {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.about-box p {
    color: var(--text-secondary);
    line-height: 1.7;
    font-size: 1.05rem;
}

.highlight-points {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1rem;
    margin-top: 1rem;
}

.h-point {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
    padding: 1.25rem;
    border-radius: 16px;
    display: flex;
    gap: 0.75rem;
}

.h-icon {
    font-size: 1.25rem;
}

.h-text strong {
    display: block;
    font-size: 0.95rem;
    margin-bottom: 0.25rem;
}

.h-text p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.4;
}

/* Pattern Tables */
.pattern-table-container {
    overflow-x: auto;
    border-radius: 16px;
    border: 1px solid var(--border-color);
}

.pattern-table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
    font-size: 0.95rem;
}

.pattern-table th, .pattern-table td {
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.pattern-table th {
    background: rgba(255, 255, 255, 0.05);
    font-weight: 700;
    color: var(--text-primary);
}

.pattern-table tr:last-child td {
    border-bottom: none;
}

.pattern-table tbody tr:hover {
    background: rgba(255, 255, 255, 0.02);
}

.negative-mark {
    color: var(--danger-color);
    font-weight: 600;
}

/* Syllabus Grid layout */
.syllabus-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
}

@media (min-width: 768px) {
    .syllabus-grid {
        grid-template-columns: 1fr 1fr;
    }
}

.syllabus-subject {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.syllabus-subject h3 {
    font-size: 1.2rem;
    font-weight: 700;
    border-left: 4px solid var(--primary-color);
    padding-left: 0.75rem;
}

.syllabus-topics {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.syllabus-topics li {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.5;
}

.syllabus-topics li::before {
    content: '•';
    color: var(--primary-color);
    font-weight: bold;
    font-size: 1.1rem;
    line-height: 1;
}

/* Height & Weight Chart */
.height-chart {
    background: rgba(255, 255, 255, 0.02);
    border-radius: 20px;
    border: 1px solid var(--border-color);
    padding: 1.5rem;
    margin-top: 1.5rem;
}

.height-chart h4 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.height-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 1rem;
}

.height-item {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
    padding: 1rem;
    border-radius: 12px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
}

.height-item strong {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.height-item span {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--accent-color);
}

/* Physical Grid */
.physical-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.25rem;
}

.physical-item {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-color);
    padding: 1.25rem;
    border-radius: 16px;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.physical-icon {
    font-size: 1.75rem;
    width: 44px;
    height: 44px;
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.05);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.physical-content {
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
}

.physical-content strong {
    font-size: 0.95rem;
    font-weight: 700;
}

.physical-content p {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.marks-info {
    font-size: 0.75rem;
    color: var(--accent-color);
    font-weight: 600;
}

/* Seva Nidhi / Cadet Stipend Box */
.stipend-box {
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.15) 0%, transparent 100%);
    border: 1px solid rgba(245, 158, 11, 0.25);
    padding: 1.5rem;
    border-radius: 20px;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-top: 1rem;
}

.stipend-item {
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
}

.stipend-value {
    font-size: 2rem;
    font-weight: 800;
    color: var(--accent-color);
}

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

.highlight-box {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 1.5rem;
    margin-top: 1.5rem;
}

.highlight-box h4 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.highlight-box ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.highlight-box ul li {
    font-size: 0.95rem;
    color: var(--text-secondary);
    display: flex;
    gap: 0.5rem;
    line-height: 1.5;
}

.highlight-box ul li::before {
    content: '✓';
    color: var(--success-color);
    font-weight: bold;
}

/* Practice & Interactive Mock Quiz Section */
.practice-header {
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1rem;
    margin-bottom: 1.5rem;
}

.practice-header h2 {
    font-size: 1.5rem;
    font-weight: 700;
}

.practice-header p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-top: 0.25rem;
}

.quiz-container {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.quiz-card {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 1.75rem;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    transition: all 0.3s;
}

.quiz-card:hover {
    border-color: rgba(13, 148, 136, 0.25);
    background: rgba(255, 255, 255, 0.03);
}

.quiz-question-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.quiz-subject-tag {
    font-size: 0.75rem;
    font-weight: 700;
    padding: 0.25rem 0.6rem;
    border-radius: 6px;
    background: rgba(13, 148, 136, 0.15);
    color: var(--primary-color);
    text-transform: uppercase;
}

.quiz-xp-tag {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--accent-color);
}

.quiz-question-text {
    font-size: 1.1rem;
    font-weight: 600;
    line-height: 1.5;
}

.quiz-options {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.75rem;
}

@media (min-width: 768px) {
    .quiz-options {
        grid-template-columns: 1fr 1fr;
    }
}

.option-btn {
    background: rgba(30, 41, 59, 0.4);
    border: 1px solid var(--border-color);
    padding: 1rem 1.25rem;
    border-radius: 12px;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.95rem;
    font-weight: 500;
    text-align: left;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.option-btn:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--text-secondary);
}

.option-btn.selected {
    border-color: var(--primary-color);
    background: rgba(13, 148, 136, 0.1);
}

/* Feedback states */
.option-btn.correct {
    background: rgba(16, 185, 129, 0.15) !important;
    border-color: var(--success-color) !important;
    color: #34d399;
    font-weight: 600;
}

.option-btn.incorrect {
    background: rgba(239, 68, 68, 0.15) !important;
    border-color: var(--danger-color) !important;
    color: #f87171;
}

.option-icon {
    font-size: 1.1rem;
}

.explanation-box {
    background: rgba(16, 185, 129, 0.05);
    border: 1px solid rgba(16, 185, 129, 0.15);
    padding: 1.25rem;
    border-radius: 12px;
    font-size: 0.9rem;
    line-height: 1.6;
    display: none;
    animation: slideDown 0.3s ease-out;
}

@keyframes slideDown {
    from { opacity: 0; transform: translateY(-5px); }
    to { opacity: 1; transform: translateY(0); }
}

.explanation-box strong {
    color: var(--success-color);
    display: block;
    margin-bottom: 0.25rem;
}

.explanation-box p {
    color: var(--text-secondary);
}

.disclaimer-box {
    margin-top: 1rem;
    font-size: 0.8rem;
    color: var(--text-tertiary);
    line-height: 1.4;
}

/* Resource links */
.resources-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.resource-item {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-color);
    padding: 1.25rem;
    border-radius: 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    text-decoration: none;
    color: inherit;
    transition: all 0.3s;
}

.resource-item:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(13, 148, 136, 0.2);
    transform: translateY(-2px);
}

.resource-info {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.resource-file-icon {
    font-size: 1.5rem;
    color: var(--accent-color);
}

.resource-name {
    font-weight: 600;
    font-size: 0.95rem;
}

.resource-meta {
    font-size: 0.8rem;
    color: var(--text-tertiary);
    display: block;
    margin-top: 0.15rem;
}

.resource-action {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--primary-color);
}

/* Footer */
.nda-footer {
    border-top: 1px solid var(--border-color);
    padding: 3rem 1rem;
    text-align: center;
    margin-top: 5rem;
    background: rgba(15, 23, 42, 0.3);
}

.footer-content {
    max-width: 600px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.footer-content a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
}

.disclaimer {
    font-size: 0.75rem;
    color: var(--text-tertiary);
    line-height: 1.5;
}

/* Utility visibility classes for translations */
.lang-hi {
    display: none;
}