@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600&family=Playfair+Display:ital,wght@0,400;0,600;0,700;1,400&display=swap');

:root {
    --bg-primary: #0a1412;
    --bg-secondary: #10221e;
    --accent-gold: #d4af37;
    --accent-green: #2d5a27;
    --accent-green-light: #4c8c45;
    --text-primary: #f5f6f5;
    --text-secondary: #a3b8b5;
    --glass-bg: rgba(16, 34, 30, 0.65);
    --glass-border: rgba(212, 175, 55, 0.15);
    --font-sans: 'Inter', sans-serif;
    --font-serif: 'Playfair Display', Georgia, serif;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-sans);
    line-height: 1.6;
    overflow-x: hidden;
    background-image: 
        radial-gradient(circle at 10% 20%, rgba(45, 90, 39, 0.15) 0%, transparent 40%),
        radial-gradient(circle at 90% 80%, rgba(212, 175, 55, 0.08) 0%, transparent 45%);
    background-attachment: fixed;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Header & Navigation */
header {
    padding: 1.5rem 0;
    border-bottom: 1px solid var(--glass-border);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 100;
    background-color: rgba(10, 20, 18, 0.8);
}

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

.logo {
    font-family: var(--font-serif);
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--text-primary);
    text-decoration: none;
    letter-spacing: 0.5px;
}

.logo span {
    color: var(--accent-gold);
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: var(--transition);
}

.nav-links a:hover {
    color: var(--accent-gold);
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
}

/* Hero Section */
.hero {
    padding: 8rem 0 6rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero-content {
    position: relative;
    z-index: 2;
}

.hero h1 {
    font-family: var(--font-serif);
    font-size: 4rem;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    font-weight: 700;
}

.hero h1 span {
    background: linear-gradient(135deg, var(--accent-gold) 30%, #fff 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero p {
    font-size: 1.2rem;
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto 2.5rem;
    font-weight: 300;
}

.btn-primary {
    display: inline-block;
    padding: 1rem 2.5rem;
    background: linear-gradient(135deg, var(--accent-gold) 0%, #b89324 100%);
    color: #000;
    font-family: var(--font-sans);
    font-weight: 700;
    font-size: 1rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    text-decoration: none;
    border: none;
    border-radius: 30px;
    transition: var(--transition);
    box-shadow: 0 4px 15px rgba(212, 175, 55, 0.25);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(212, 175, 55, 0.4);
}

.hero-bg-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(212, 175, 55, 0.1) 0%, transparent 70%);
    z-index: 1;
    pointer-events: none;
}

/* Sections */
.section {
    padding: 6rem 0;
}

.dark-bg {
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--glass-border);
    border-bottom: 1px solid var(--glass-border);
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-header h2 {
    font-family: var(--font-serif);
    font-size: 2.5rem;
    color: var(--accent-gold);
    margin-bottom: 1rem;
}

.section-header p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* Grid & Cards */
.grid {
    display: grid;
    gap: 2rem;
}

.features-grid {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.feature-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 2.5rem;
    backdrop-filter: blur(12px);
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-5px);
    border-color: rgba(212, 175, 55, 0.4);
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
}

.feature-card .icon {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
}

.feature-card h3 {
    font-size: 1.2rem;
    margin-bottom: 1rem;
    color: #fff;
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* Split Layout (Research) */
.split-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

@media (max-width: 900px) {
    .split-layout {
        grid-template-columns: 1fr;
    }
}

.split-text h2 {
    font-family: var(--font-serif);
    font-size: 2.5rem;
    color: var(--accent-gold);
    margin-bottom: 0.5rem;
}

.split-text .subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    font-weight: 500;
}

.split-text p {
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.check-list {
    list-style: none;
}

.check-list li {
    position: relative;
    padding-left: 2rem;
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

.check-list li::before {
    content: "✓";
    position: absolute;
    left: 0;
    top: 0;
    color: var(--accent-gold);
    font-weight: bold;
}

.check-list li strong {
    color: #fff;
}

.research-visual {
    background: rgba(0,0,0,0.3);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    height: 300px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.pulse-circle {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    background: radial-gradient(circle, var(--accent-gold) 0%, transparent 70%);
    animation: pulse 3s infinite;
}

@keyframes pulse {
    0% { transform: scale(0.9); opacity: 0.5; }
    50% { transform: scale(1.1); opacity: 1; }
    100% { transform: scale(0.9); opacity: 0.5; }
}

.data-lines {
    position: absolute;
    bottom: 2rem;
    left: 2rem;
    right: 2rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.data-lines .line {
    height: 4px;
    background: rgba(255,255,255,0.1);
    border-radius: 2px;
}

.data-lines .line.w-100 { width: 100%; background: var(--accent-gold); }
.data-lines .line.w-80 { width: 80%; background: var(--accent-green-light); }
.data-lines .line.w-60 { width: 60%; }

/* Timeline (Roadmap) */
.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    left: 50%;
    width: 2px;
    background: var(--glass-border);
    transform: translateX(-50%);
}

.timeline-item {
    position: relative;
    margin-bottom: 3rem;
    width: 50%;
    padding-right: 3rem;
}

.timeline-item:nth-child(even) {
    margin-left: 50%;
    padding-right: 0;
    padding-left: 3rem;
}

.timeline-dot {
    position: absolute;
    top: 0;
    right: -15px;
    width: 30px;
    height: 30px;
    background: var(--bg-primary);
    border: 2px solid var(--accent-gold);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    color: var(--accent-gold);
    z-index: 2;
}

.timeline-item:nth-child(even) .timeline-dot {
    right: auto;
    left: -15px;
}

.timeline-content {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    padding: 1.5rem;
    border-radius: 12px;
}

.timeline-content h3 {
    color: #fff;
    margin-bottom: 0.5rem;
}

.timeline-content p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    .timeline::before {
        left: 20px;
    }
    .timeline-item {
        width: 100%;
        padding-left: 50px;
        padding-right: 0;
    }
    .timeline-item:nth-child(even) {
        margin-left: 0;
        padding-left: 50px;
    }
    .timeline-dot {
        right: auto !important;
        left: 5px !important;
    }
}

/* Catalog Grid */
.catalog-grid {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.book-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    overflow: hidden;
    transition: var(--transition);
}

.book-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.4);
    border-color: var(--accent-gold);
}

.book-cover {
    height: 200px;
    background: #1a1a1a;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    position: relative;
    border-bottom: 1px solid rgba(255,255,255,0.05);
}

.book-cover h4 {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    color: #fff;
    text-align: center;
    padding: 0 1rem;
    text-shadow: 0 2px 4px rgba(0,0,0,0.8);
}

.badge {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: rgba(212, 175, 55, 0.2);
    color: var(--accent-gold);
    border: 1px solid var(--accent-gold);
    padding: 0.2rem 0.6rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

/* Mock Covers */
.mock-cover-1 { background: linear-gradient(135deg, #1a2a6c, #112942); }
.mock-cover-2 { background: linear-gradient(135deg, #4b1212, #2a0808); }
.mock-cover-3 { background: linear-gradient(135deg, #0f2027, #203a43); }
.mock-cover-4 { background: linear-gradient(135deg, #00416a, #001f3f); }
.mock-cover-5 { background: linear-gradient(135deg, #5c258d, #4389a2); }
.mock-cover-6 { background: linear-gradient(135deg, #870000, #190a05); }

.book-info {
    padding: 1.5rem;
}

.book-info h3 {
    font-size: 1.1rem;
    color: #fff;
    margin-bottom: 0.5rem;
}

.book-info p {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* Footer */
footer {
    padding: 4rem 0 2rem;
    text-align: center;
    border-top: 1px solid var(--glass-border);
}

.footer-brand h3 {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    color: var(--accent-gold);
    margin-bottom: 0.5rem;
}

.footer-brand p {
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-links a {
    color: var(--text-primary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--accent-gold);
}

.copyright {
    color: rgba(255,255,255,0.3);
    font-size: 0.8rem;
}