/* Root Design Tokens */
:root {
    --bg-main: #0b0f19;
    --bg-card: rgba(18, 26, 43, 0.7);
    --bg-card-hover: rgba(26, 38, 64, 0.85);
    --border-color: rgba(255, 255, 255, 0.08);
    --border-glow: rgba(99, 102, 241, 0.3);

    --text-primary: #f3f4f6;
    --text-secondary: #9ca3af;
    --text-muted: #6b7280;

    --accent-purple: #8b5cf6;
    --accent-indigo: #6366f1;
    --accent-cyan: #06b6d4;
    --accent-emerald: #10b981;
    --accent-amber: #f59e0b;
    --accent-rose: #f43f5e;

    --gradient-primary: linear-gradient(135deg, #8b5cf6 0%, #6366f1 50%, #06b6d4 100%);
    --gradient-glow: linear-gradient(135deg, rgba(139, 92, 246, 0.2), rgba(6, 182, 212, 0.2));
    
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-full: 9999px;

    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --font-sans: 'Plus Jakarta Sans', -apple-system, sans-serif;
    --font-display: 'Space Grotesk', sans-serif;
}

/* Light Mode Overrides */
body.light-mode {
    --bg-main: #f8fafc;
    --bg-card: rgba(255, 255, 255, 0.85);
    --bg-card-hover: rgba(255, 255, 255, 0.98);
    --border-color: rgba(0, 0, 0, 0.08);
    --border-glow: rgba(99, 102, 241, 0.2);

    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #64748b;
}

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

html {
    scroll-behavior: smooth;
}

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

.container {
    max-width: 1240px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Glowing Background Blobs */
.bg-glow {
    position: fixed;
    border-radius: 50%;
    filter: blur(120px);
    z-index: -1;
    pointer-events: none;
    opacity: 0.4;
}

.blob-1 {
    top: -100px;
    left: -100px;
    width: 500px;
    height: 500px;
    background: var(--accent-purple);
}

.blob-2 {
    top: 40%;
    right: -150px;
    width: 600px;
    height: 600px;
    background: var(--accent-cyan);
}

/* Typography & Utilities */
h1, h2, h3, h4 {
    font-family: var(--font-display);
    color: var(--text-primary);
    line-height: 1.25;
}

.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.highlight {
    color: var(--accent-cyan);
}

.section {
    padding: 80px 0;
}

.section-header {
    text-align: center;
    max-width: 750px;
    margin: 0 auto 50px auto;
}

.section-tag {
    display: inline-block;
    padding: 6px 16px;
    border-radius: var(--radius-full);
    background: rgba(99, 102, 241, 0.12);
    border: 1px solid rgba(99, 102, 241, 0.3);
    color: var(--accent-indigo);
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    margin-bottom: 16px;
}

.section-header h2 {
    font-size: 36px;
    margin-bottom: 16px;
}

.section-header p {
    color: var(--text-secondary);
    font-size: 17px;
}

/* Navigation Bar */
.navbar {
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(16px);
    background: rgba(11, 15, 25, 0.75);
    border-bottom: 1px solid var(--border-color);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 76px;
}

.brand-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    font-family: var(--font-display);
    font-size: 22px;
    font-weight: 800;
    color: var(--text-primary);
}

.logo-icon {
    width: 38px;
    height: 38px;
    border-radius: var(--radius-md);
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    box-shadow: 0 4px 20px rgba(139, 92, 246, 0.4);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 28px;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 14px;
    transition: var(--transition);
}

.nav-link:hover, .nav-link.active {
    color: var(--text-primary);
}

.btn-quiz-nav {
    display: flex;
    align-items: center;
    gap: 6px;
    color: var(--accent-cyan);
    font-weight: 600;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 14px;
}

.api-status-badge {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    border-radius: var(--radius-full);
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.3);
    font-size: 12px;
    font-weight: 600;
    color: var(--accent-emerald);
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--accent-emerald);
    box-shadow: 0 0 8px var(--accent-emerald);
}

.status-dot.offline {
    background: var(--accent-amber);
    box-shadow: 0 0 8px var(--accent-amber);
}

.icon-btn {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    border: 1px solid var(--border-color);
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.icon-btn:hover {
    border-color: var(--accent-indigo);
    background: rgba(99, 102, 241, 0.15);
}

body.dark-mode .sun-icon { display: block; }
body.dark-mode .moon-icon { display: none; }
body.light-mode .sun-icon { display: none; }
body.light-mode .moon-icon { display: block; }

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 15px;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    border: none;
}

.btn-sm {
    padding: 8px 16px;
    font-size: 13px;
}

.btn-primary {
    background: var(--gradient-primary);
    color: #ffffff;
    box-shadow: 0 4px 25px rgba(99, 102, 241, 0.35);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(99, 102, 241, 0.5);
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

.btn-outline:hover {
    border-color: var(--accent-indigo);
    background: rgba(99, 102, 241, 0.1);
}

.btn-accent {
    background: linear-gradient(135deg, #10b981 0%, #06b6d4 100%);
    color: #fff;
    box-shadow: 0 4px 20px rgba(16, 185, 129, 0.35);
}

.btn-accent:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(16, 185, 129, 0.5);
}

.full-width {
    width: 100%;
}

/* Hero Section */
.hero-section {
    padding: 80px 0 50px 0;
    text-align: center;
}

.hero-container {
    max-width: 900px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 8px 18px;
    border-radius: var(--radius-full);
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border-color);
    margin-bottom: 24px;
    font-size: 14px;
}

.pulse-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--accent-emerald);
    box-shadow: 0 0 10px var(--accent-emerald);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
    70% { transform: scale(1); box-shadow: 0 0 0 10px rgba(16, 185, 129, 0); }
    100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

.hero-title {
    font-size: 48px;
    letter-spacing: -1px;
    margin-bottom: 20px;
}

.hero-subtitle {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 40px;
    line-height: 1.7;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-top: 40px;
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 20px;
    backdrop-filter: blur(10px);
}

.stat-num {
    font-family: var(--font-display);
    font-size: 28px;
    font-weight: 700;
    color: var(--accent-cyan);
}

.stat-label {
    font-size: 13px;
    color: var(--text-secondary);
    margin-top: 4px;
}

/* AI Semantic Search API Component */
.ai-search-container {
    padding-top: 20px;
    padding-bottom: 40px;
}

.ai-search-card {
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.12), rgba(6, 182, 212, 0.08));
    border: 1px solid rgba(99, 102, 241, 0.4);
    border-radius: var(--radius-lg);
    padding: 40px;
}

.ai-search-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 30px auto;
}

.ai-search-header h2 {
    font-size: 28px;
    margin: 10px 0;
}

.ai-search-header p {
    color: var(--text-secondary);
    font-size: 15px;
}

.ai-search-input-group {
    display: flex;
    gap: 14px;
    max-width: 850px;
    margin: 0 auto;
}

.input-wrap {
    position: relative;
    flex-grow: 1;
}

.input-wrap .ai-icon {
    position: absolute;
    left: 18px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--accent-purple);
}

.input-wrap input {
    width: 100%;
    padding: 16px 20px 16px 50px;
    border-radius: var(--radius-md);
    background: rgba(0, 0, 0, 0.35);
    border: 1px solid rgba(99, 102, 241, 0.4);
    color: var(--text-primary);
    font-size: 15px;
    outline: none;
    transition: var(--transition);
}

.input-wrap input:focus {
    border-color: var(--accent-cyan);
    box-shadow: 0 0 20px rgba(6, 182, 212, 0.3);
}

.ai-response-box {
    margin-top: 30px;
    background: rgba(15, 23, 42, 0.9);
    border: 1px solid var(--accent-purple);
    border-radius: var(--radius-md);
    padding: 24px;
    animation: fadeIn 0.4s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.ai-insight-text {
    font-size: 15px;
    color: var(--text-primary);
    line-height: 1.6;
    margin-bottom: 20px;
}

/* Niche Grid Cards */
.niche-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.border-glow {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 32px;
    backdrop-filter: blur(12px);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.border-glow:hover {
    border-color: var(--border-glow);
    transform: translateY(-4px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

.niche-icon {
    width: 50px;
    height: 50px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    margin-bottom: 20px;
}

.bg-purple { background: linear-gradient(135deg, #8b5cf6, #7c3aed); }
.bg-blue { background: linear-gradient(135deg, #3b82f6, #2563eb); }
.bg-emerald { background: linear-gradient(135deg, #10b981, #059669); }
.bg-amber { background: linear-gradient(135deg, #f59e0b, #d97706); }

.niche-card h3 {
    font-size: 22px;
    margin-bottom: 8px;
}

.niche-status {
    display: inline-block;
    font-size: 12px;
    font-weight: 700;
    padding: 4px 10px;
    border-radius: var(--radius-full);
    margin-bottom: 14px;
}

.status-high { background: rgba(16, 185, 129, 0.15); color: var(--accent-emerald); }
.status-medium { background: rgba(245, 158, 11, 0.15); color: var(--accent-amber); }

.niche-desc {
    color: var(--text-secondary);
    font-size: 15px;
    margin-bottom: 20px;
}

.niche-points {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.niche-points li {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    font-size: 14px;
    color: var(--text-secondary);
}

.niche-points li i {
    color: var(--accent-cyan);
    flex-shrink: 0;
    margin-top: 3px;
}

/* Curator Dashboard Controls */
.controls-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 24px;
    margin-bottom: 40px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.search-box {
    position: relative;
    width: 100%;
}

.search-box i {
    position: absolute;
    left: 18px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
}

.search-box input {
    width: 100%;
    padding: 14px 18px 14px 48px;
    border-radius: var(--radius-md);
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    font-size: 15px;
    outline: none;
    transition: var(--transition);
}

.search-box input:focus {
    border-color: var(--accent-indigo);
    box-shadow: 0 0 15px rgba(99, 102, 241, 0.25);
}

.filter-group {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
}

.filter-label {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 6px;
    margin-right: 6px;
}

.filter-btn, .level-btn {
    padding: 8px 16px;
    border-radius: var(--radius-full);
    border: 1px solid var(--border-color);
    background: rgba(255, 255, 255, 0.03);
    color: var(--text-secondary);
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.filter-btn:hover, .level-btn:hover {
    border-color: var(--accent-indigo);
    color: var(--text-primary);
}

.filter-btn.active, .level-btn.active {
    background: var(--gradient-primary);
    color: #fff;
    border-color: transparent;
}

/* Books Grid */
.books-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.book-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: var(--transition);
    position: relative;
}

.book-card:hover {
    transform: translateY(-6px);
    border-color: var(--border-glow);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

.book-cover-container {
    height: 220px;
    background: linear-gradient(135deg, rgba(30, 41, 59, 0.8), rgba(15, 23, 42, 0.9));
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    overflow: hidden;
}

.book-tag-category {
    position: absolute;
    top: 14px;
    left: 14px;
    padding: 4px 10px;
    border-radius: var(--radius-full);
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    color: var(--accent-cyan);
    border: 1px solid rgba(6, 182, 212, 0.3);
}

.book-level-badge {
    position: absolute;
    top: 14px;
    right: 14px;
    padding: 4px 10px;
    border-radius: var(--radius-full);
    font-size: 11px;
    font-weight: 700;
    background: rgba(139, 92, 246, 0.2);
    color: var(--accent-purple);
    border: 1px solid rgba(139, 92, 246, 0.3);
}

.book-mock-cover {
    width: 130px;
    height: 170px;
    border-radius: 6px;
    background: var(--gradient-primary);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: 14px;
    color: #fff;
    transform: rotate(-3deg);
    transition: var(--transition);
}

.book-card:hover .book-mock-cover {
    transform: rotate(0deg) scale(1.05);
}

.cover-title {
    font-size: 12px;
    font-weight: 800;
    line-height: 1.2;
}

.cover-year {
    font-size: 10px;
    opacity: 0.8;
}

.book-body {
    padding: 24px;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.book-title {
    font-size: 20px;
    margin-bottom: 8px;
    line-height: 1.3;
}

.book-author {
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 14px;
}

.book-summary-brief {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 20px;
    flex-grow: 1;
}

.book-tool-stack {
    background: rgba(0, 0, 0, 0.2);
    border-radius: var(--radius-md);
    padding: 12px;
    margin-bottom: 20px;
}

.tool-stack-title {
    font-size: 11px;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    margin-bottom: 6px;
    display: flex;
    align-items: center;
    gap: 4px;
}

.tool-badges {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.tool-chip {
    font-size: 11px;
    padding: 3px 8px;
    border-radius: var(--radius-sm);
    background: rgba(255, 255, 255, 0.06);
    color: var(--accent-cyan);
    border: 1px solid rgba(255, 255, 255, 0.08);
}

.book-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}

/* Funnel Strategy Blueprint */
.funnel-steps {
    display: flex;
    align-items: stretch;
    gap: 16px;
    margin-top: 40px;
}

.funnel-step {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    position: relative;
    padding: 32px 20px;
}

.active-step {
    border-color: var(--accent-indigo);
    background: linear-gradient(180deg, rgba(99, 102, 241, 0.15) 0%, rgba(18, 26, 43, 0.8) 100%);
}

.step-badge {
    font-size: 12px;
    font-weight: 800;
    padding: 4px 12px;
    border-radius: var(--radius-full);
    background: rgba(255, 255, 255, 0.08);
    margin-bottom: 16px;
    color: var(--text-secondary);
}

.highlight-badge {
    background: var(--gradient-primary);
    color: #fff;
}

.step-icon {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.05);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-cyan);
    margin-bottom: 16px;
}

.funnel-step h3 {
    font-size: 19px;
    margin-bottom: 10px;
}

.funnel-step p {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.step-tag {
    margin-top: auto;
    font-size: 12px;
    font-weight: 700;
    padding: 6px 12px;
    border-radius: var(--radius-md);
    background: rgba(255, 255, 255, 0.04);
    color: var(--accent-purple);
}

.tag-primary {
    background: rgba(16, 185, 129, 0.15);
    color: var(--accent-emerald);
}

.funnel-arrow {
    display: flex;
    align-items: center;
    color: var(--text-muted);
}

/* Quiz Banner */
.quiz-banner {
    padding-bottom: 80px;
}

.quiz-box {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 40px 50px;
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.15), rgba(6, 182, 212, 0.15));
    border-color: rgba(99, 102, 241, 0.4);
}

.quiz-content {
    max-width: 650px;
}

.badge-accent {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--accent-cyan);
    font-weight: 700;
    font-size: 13px;
    text-transform: uppercase;
    margin-bottom: 10px;
}

.quiz-content h2 {
    font-size: 30px;
    margin-bottom: 10px;
}

.quiz-content p {
    color: var(--text-secondary);
    font-size: 16px;
}

/* Footer */
.footer {
    background: rgba(7, 10, 18, 0.95);
    border-top: 1px solid var(--border-color);
    padding: 60px 0 20px 0;
}

.footer-container {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-col h4 {
    margin-bottom: 20px;
    font-size: 16px;
}

.footer-col ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-col ul a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    transition: var(--transition);
}

.footer-col ul a:hover {
    color: var(--accent-cyan);
}

.footer-bottom {
    text-align: center;
    border-top: 1px solid var(--border-color);
    padding-top: 20px;
    font-size: 13px;
    color: var(--text-muted);
}

/* Modals */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(12px);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.modal.active {
    display: flex;
}

.modal-content {
    max-width: 800px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
    background: #0f172a;
    padding: 36px;
}

.modal-close {
    position: absolute;
    top: 20px;
    right: 20px;
    background: rgba(255, 255, 255, 0.08);
    border: none;
    color: var(--text-primary);
    width: 36px;
    height: 36px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Payment Modal Specific Styling */
.payment-modal-content {
    max-width: 580px;
    text-align: center;
}

.qr-card-container {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-glow);
    border-radius: var(--radius-lg);
    padding: 24px;
    margin: 20px 0;
}

.qr-image-frame {
    background: #ffffff;
    padding: 14px;
    border-radius: var(--radius-md);
    display: inline-block;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    margin-bottom: 16px;
}

.qr-image-frame img {
    width: 220px;
    height: 220px;
    display: block;
}

.payment-info-list {
    text-align: left;
    background: rgba(0, 0, 0, 0.3);
    border-radius: var(--radius-md);
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    font-size: 14px;
}

.pay-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.copy-val {
    font-weight: 700;
    color: var(--accent-cyan);
    display: flex;
    align-items: center;
    gap: 6px;
}

.btn-copy {
    background: rgba(255, 255, 255, 0.1);
    border: none;
    color: #fff;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 11px;
    cursor: pointer;
}

.payment-timer {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    color: var(--accent-amber);
    margin-top: 10px;
}

/* Quiz Modal */
.quiz-modal-content {
    max-width: 550px;
}

.quiz-header {
    text-align: center;
    margin-bottom: 24px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.form-group select {
    width: 100%;
    padding: 12px;
    border-radius: var(--radius-md);
    background: rgba(0, 0, 0, 0.4);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    outline: none;
    font-size: 14px;
}

.quiz-result-box {
    margin-top: 24px;
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid var(--accent-emerald);
    border-radius: var(--radius-md);
    padding: 20px;
}

.hidden {
    display: none;
}

/* Responsive Rules */
@media (max-width: 1024px) {
    .books-grid { grid-template-columns: repeat(2, 1fr); }
    .niche-grid { grid-template-columns: 1fr; }
    .funnel-steps { flex-direction: column; }
    .funnel-arrow { transform: rotate(90deg); justify-content: center; }
}

@media (max-width: 768px) {
    .hero-title { font-size: 34px; }
    .hero-stats { grid-template-columns: repeat(2, 1fr); }
    .books-grid { grid-template-columns: 1fr; }
    .nav-menu { display: none; }
    .quiz-box { flex-direction: column; text-align: center; gap: 20px; }
    .footer-container { grid-template-columns: 1fr; }
    .ai-search-input-group { flex-direction: column; }
}