:root {
    --bg-color: #030303;
    --bg-alt: #0a0a0a;
    --text-primary: #ffffff;
    --text-secondary: #888888;
    --accent-color: #3b82f6;
    --accent-glow: rgba(59, 130, 246, 0.5);
    --accent-gradient: linear-gradient(135deg, #3b82f6, #8b5cf6);
    --card-bg: rgba(20, 20, 20, 0.6);
    --border-color: rgba(255, 255, 255, 0.08);
    --font-sans: 'Inter', system-ui, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

/* 3D Backgrounds per section */
.section-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
}

.noise-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
    pointer-events: none;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
    opacity: 0.03;
}

a {
    text-decoration: none;
    color: inherit;
    transition: all 0.3s ease;
}

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

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

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    position: relative;
    z-index: 2;
}

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: rgba(3, 3, 3, 0.7);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    padding: 1.25rem 0;
}

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

.logo {
    font-size: 1.5rem;
    font-weight: 900;
    letter-spacing: -0.05em;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2.5rem;
    align-items: center;
}

.nav-links a {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.nav-links a:hover {
    color: var(--text-primary);
}

.nav-cta {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    padding: 0.5rem 1rem;
    border-radius: 2rem;
}

.nav-cta:hover {
    background: var(--text-primary);
    color: var(--bg-color) !important;
}

/* Hero */
.hero {
    padding: 14rem 0 8rem;
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}

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

.badge {
    display: inline-block;
    padding: 0.4rem 1rem;
    background: rgba(59, 130, 246, 0.1);
    border: 1px solid rgba(59, 130, 246, 0.3);
    color: var(--accent-color);
    border-radius: 2rem;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    margin-bottom: 2rem;
}

.hero-title {
    font-size: clamp(3.5rem, 8vw, 6rem);
    font-weight: 900;
    line-height: 1.05;
    letter-spacing: -0.04em;
    margin-bottom: 1.5rem;
}

.hero-subtitle {
    font-size: clamp(1.1rem, 2.5vw, 1.4rem);
    color: var(--text-secondary);
    max-width: 700px;
    margin-bottom: 3rem;
    line-height: 1.6;
    font-weight: 400;
}

.hero-actions {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 1rem 2rem;
    border-radius: 0.5rem;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border: none;
}

.btn-primary {
    background: var(--text-primary);
    color: var(--bg-color);
    box-shadow: 0 0 20px rgba(255, 255, 255, 0.1);
}

.btn-primary:hover {
    background: #d4d4d4;
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(255, 255, 255, 0.2);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

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

.btn-outline:hover {
    border-color: var(--accent-color);
    color: var(--accent-color);
}

/* Sections */
.section {
    padding: 8rem 0;
    position: relative;
    overflow: hidden;
}

.section-header {
    margin-bottom: 4rem;
    max-width: 700px;
}

.section-title {
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    font-weight: 700;
    margin-bottom: 1rem;
    letter-spacing: -0.03em;
}

.section-desc {
    font-size: 1.1rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Video Grid */
.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
}

.video-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    overflow: hidden;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
}

.video-card:hover {
    border-color: rgba(59, 130, 246, 0.4);
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

.video-wrapper {
    position: relative;
    padding-bottom: 56.25%; /* 16:9 */
    height: 0;
    overflow: hidden;
    background: #000;
}

.video-wrapper iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
}

.video-info {
    padding: 1.5rem;
}

.video-tag {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--accent-color);
    margin-bottom: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.05em;
}

.video-info h3 {
    font-size: 1.1rem;
    font-weight: 600;
    line-height: 1.4;
}

/* Systems Showcase */
.systems-showcase {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.system-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    padding: 3.5rem;
    backdrop-filter: blur(10px);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.system-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--accent-gradient);
    opacity: 0;
    transition: opacity 0.4s ease;
}

.system-card:hover {
    border-color: rgba(59, 130, 246, 0.3);
    transform: translateX(10px);
    background: rgba(20, 20, 20, 0.8);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

.system-card:hover::before {
    opacity: 1;
}

.system-meta {
    font-family: var(--font-mono);
    color: var(--accent-color);
    font-size: 0.85rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    margin-bottom: 1rem;
}

.system-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    letter-spacing: -0.02em;
}

.system-description {
    color: var(--text-secondary);
    font-size: 1.1rem;
    line-height: 1.7;
    margin-bottom: 2rem;
    max-width: 800px;
}

.system-features {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    list-style: none;
}

.system-features li {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.08);
    padding: 0.5rem 1rem;
    border-radius: 2rem;
    font-size: 0.85rem;
    color: var(--text-primary);
    font-family: var(--font-mono);
}

@media (max-width: 768px) {
    .system-card {
        padding: 2rem;
    }
    .system-title {
        font-size: 1.5rem;
    }
}

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

@media (max-width: 900px) {
    .split-layout {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
}

/* Philosophy Box */
.philosophy-box {
    background: rgba(255, 255, 255, 0.03);
    border-left: 2px solid var(--accent-color);
    padding: 2rem;
    border-radius: 0 1rem 1rem 0;
}

.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;
    color: var(--accent-color);
    font-weight: bold;
}

/* Tags */
.tech-container {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 1.5rem;
    padding: 3rem;
    backdrop-filter: blur(10px);
}

.tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.tag {
    background-color: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--text-primary);
    transition: all 0.2s;
}

.tag:hover {
    background-color: var(--accent-color);
    border-color: var(--accent-color);
    color: white;
}

/* Newsletter */
.newsletter-container {
    position: relative;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 2rem;
    padding: 5rem 2rem;
    text-align: center;
    overflow: hidden;
    backdrop-filter: blur(10px);
}

.newsletter-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 60%;
    height: 60%;
    background: var(--accent-gradient);
    filter: blur(100px);
    opacity: 0.15;
    z-index: 0;
    pointer-events: none;
}

.newsletter-content {
    position: relative;
    z-index: 1;
}

.newsletter-form {
    max-width: 500px;
    margin: 0 auto;
}

.input-group {
    display: flex;
    background: rgba(0, 0, 0, 0.5);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    padding: 0.5rem;
    transition: border-color 0.3s;
}

.input-group:focus-within {
    border-color: var(--accent-color);
}

.form-input {
    flex: 1;
    padding: 1rem;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 1rem;
}

.form-input:focus {
    outline: none;
}

.submit-btn {
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
}

@media (max-width: 500px) {
    .input-group {
        flex-direction: column;
        background: transparent;
        border: none;
        padding: 0;
        gap: 1rem;
    }
    .form-input {
        background: rgba(0, 0, 0, 0.5);
        border: 1px solid var(--border-color);
        border-radius: 0.75rem;
    }
}

/* Footer */
.footer {
    border-top: 1px solid var(--border-color);
    padding: 4rem 0 2rem;
    background: #000;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.footer-logo {
    font-size: 1.25rem;
    font-weight: 900;
}

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

.footer-links a {
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
}

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

.footer-bottom {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.85rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
}

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