@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

/* --- Sprint 3 & 4: Token & Container System --- */
:root {
    --bg-dark: #050816;
    --accent-blue: #3b82f6;
    --accent-purple: #7c3aed;
    --text-primary: #ffffff;
    --text-secondary: #9ca3af;
    --text-muted: #4b5563;
    
    --glass-bg: rgba(255, 255, 255, 0.02);
    --glass-border: rgba(255, 255, 255, 0.06);
    --glass-blur: blur(16px);
    
    --radius-sm: 6px;
    --radius-md: 14px;
    --font-sans: 'Inter', sans-serif;
}

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

body {
    background-color: var(--bg-dark);
    color: var(--text-primary);
    font-family: var(--font-sans);
    min-height: 100vh;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    line-height: 1.5;
}

/* Responsive Container Matrix */
.container {
    width: 88%; /* Phone default */
    max-width: 1200px;
    margin: 0 auto;
}
@media (min-width: 768px) { .container { width: 92%; } }
@media (min-width: 1024px) { .container { width: 100%; } }

/* --- Sprint 1: Responsive Navigation --- */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(5, 8, 22, 0.4);
    backdrop-filter: var(--glass-blur);
    border-bottom: 1px solid var(--glass-border);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 72px;
}

.brand {
    font-weight: 700;
    font-size: 1.25rem;
    letter-spacing: -0.02em;
    text-decoration: none;
    color: var(--text-primary);
}

.nav-links {
    display: none; /* Mobile Hidden */
}

.menu-toggle {
    display: block;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 24px;
    cursor: pointer;
    z-index: 1001;
}

/* Full-Screen Glass Menu */
.mobile-menu {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: rgba(5, 8, 22, 0.98);
    backdrop-filter: blur(24px);
    z-index: 999;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 32px;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.mobile-menu.is-active {
    opacity: 1;
    pointer-events: auto;
}

.mobile-menu a {
    color: var(--text-primary);
    text-decoration: none;
    font-size: 1.5rem;
    font-weight: 500;
    letter-spacing: -0.01em;
}

.nav-btn-mobile {
    margin-top: 16px;
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    padding: 14px 28px;
    border-radius: var(--radius-sm);
    font-size: 1rem !important;
    font-weight: 600 !important;
}

@media (min-width: 768px) {
    .nav-links { display: flex; gap: 32px; align-items: center; }
    .nav-links a { color: var(--text-secondary); text-decoration: none; font-size: 0.9rem; font-weight: 500; transition: color 0.2s; }
    .nav-links a:hover { color: var(--text-primary); }
    .menu-toggle, .mobile-menu { display: none !important; }
    .nav-btn { background: var(--text-primary); color: var(--bg-dark) !important; padding: 8px 16px; border-radius: var(--radius-sm); font-weight: 600; }
}

/* --- Sprint 2 & 10: Hero Layout & Mobile Optimization --- */
.hero {
    position: relative;
    padding-top: 160px;
    padding-bottom: 80px;
    text-align: center;
    overflow: hidden;
}

.lab-tag {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 24px;
}

.hero h1 {
    font-size: 2.75rem;
    font-weight: 800;
    letter-spacing: -0.04em;
    line-height: 1.15;
    margin-bottom: 24px;
}

.hero p {
    font-size: 1.05rem;
    color: var(--text-secondary);
    max-width: 540px;
    margin: 0 auto 40px auto;
    font-weight: 400;
    line-height: 1.6;
}

.hero-btn {
    display: inline-block;
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    color: var(--text-primary);
    text-decoration: none;
    padding: 16px 36px;
    border-radius: 100px;
    font-weight: 600;
    font-size: 0.95rem;
    box-shadow: 0 4px 20px rgba(124, 58, 237, 0.25);
    transition: transform 0.2s;
}
.hero-btn:transform:active { transform: scale(0.98); }

@media (min-width: 768px) {
    .hero { padding-top: 220px; padding-bottom: 140px; }
    .hero h1 { font-size: 4.5rem; }
    .hero p { font-size: 1.25rem; }
}

/* --- Sprint 5 & 6: Product Cards & Status Badges --- */
.products-section { padding: 80px 0; }

.product-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 24px;
    margin-top: 48px;
}
@media (min-width: 768px) { .product-grid { grid-template-columns: repeat(2, 1fr); } }

.product-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    padding: 32px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    min-height: 300px;
    position: relative;
    transition: border-color 0.3s, box-shadow 0.3s;
}
.product-card:hover {
    border-color: rgba(59, 130, 246, 0.2);
    box-shadow: 0 10px 30px rgba(59, 130, 246, 0.04);
}

.card-top {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
}

.card-meta { display: flex; gap: 8px; align-items: center; }

.version-tag {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 600;
}

.status-pill {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 10px;
    border-radius: 100px;
    font-size: 0.7rem;
    font-weight: 600;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.04);
}
.status-pill.ready { color: #10b981; }
.status-pill.building { color: #f59e0b; }

.product-card h3 {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin: 24px 0 8px 0;
}

.product-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.5;
}

.card-action {
    margin-top: 32px;
    padding-top: 20px;
    border-top: 1px solid var(--glass-border);
    color: var(--accent-blue);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

/* --- Sprint 7: Background Layer Canvas --- */
#neural-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    pointer-events: none;
}

/* --- Sprint 8: Scroll Motion Base --- */
.fade-up {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1), transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}
.fade-up.visible {
    opacity: 1;
    transform: translateY(0);
}

/* --- Sprint 9: Premium Footer --- */
footer {
    border-top: 1px solid var(--glass-border);
    padding: 60px 0;
    margin-top: 100px;
}
.footer-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 40px;
}
@media (min-width: 768px) { .footer-grid { grid-template-columns: 2fr repeat(3, 1fr); } }

.footer-brand h4 { font-size: 1.1rem; font-weight: 700; margin-bottom: 12px; }
.footer-brand p { color: var(--text-secondary); font-size: 0.9rem; max-width: 260px; }
.footer-links h5 { font-size: 0.85rem; font-weight: 600; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 16px; }
.footer-links ul { list-style: none; display: flex; flex-direction: column; gap: 12px; }
.footer-links a { color: var(--text-secondary); text-decoration: none; font-size: 0.9rem; }
.footer-links a:hover { color: var(--text-primary); }
.copyright { margin-top: 48px; font-size: 0.8rem; color: var(--text-muted); }