@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;600;700&family=JetBrains+Mono:wght@400;600&display=swap');

:root {
    --bg: #0D1117;
    --card-bg: #161B22;
    --border: #30363D;
    --green: #3FB950;
    --blue: #58A6FF;
    --text: #E6EDF3;
    --muted: #8B949E;
}

* { box-sizing: border-box; }

body, html {
    margin: 0; padding: 0;
    font-family: 'Space Grotesk', sans-serif;
    color: var(--text);
    background-color: var(--bg);
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
    min-height: 100vh;
}

/* ── Canvas ─────────────────────────────────────────────────────── */

canvas#waveAnimation {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    pointer-events: none;
    z-index: 1;
}

/* ── Nav ────────────────────────────────────────────────────────── */

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 40px;
    background: rgba(13, 17, 23, 0.88);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid var(--border);
}

.logo {
    font-family: 'JetBrains Mono', monospace;
    color: var(--text);
    font-size: 1.4rem;
    font-weight: 600;
    letter-spacing: -0.01em;
}

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

.nav-link {
    text-decoration: none;
    background-color: var(--green);
    color: #0D1117;
    padding: 10px 20px;
    border-radius: 6px;
    font-weight: 700;
    font-size: 0.9rem;
    transition: background-color 0.2s, transform 0.2s;
    white-space: nowrap;
}

.nav-link:hover, .nav-link:focus {
    background-color: var(--blue);
    color: #0D1117;
    transform: translateY(-1px);
}

@media (max-width: 480px) {
    nav { padding: 12px 20px; }
    .logo { font-size: 1.1rem; }
    .nav-link { padding: 8px 14px; font-size: 0.82rem; }
}

/* ── Hero ───────────────────────────────────────────────────────── */

.hero {
    text-align: center;
    padding: 14vh 20px 0;
    position: relative;
    z-index: 10;
}

.brand-h1 {
    font-size: clamp(2rem, 6vw, 4.5rem);
    margin: 0;
    font-weight: 700;
    line-height: 1.15;
    letter-spacing: -0.02em;
}

.hero-tagline {
    max-width: 640px;
    margin: 24px auto;
    color: var(--muted);
    line-height: 1.7;
    font-size: 1.05rem;
}

/* ── Cards ──────────────────────────────────────────────────────── */

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 20px;
    margin: 40px auto;
    padding: 0 20px;
    max-width: 1200px;
    position: relative;
    z-index: 10;
}

.card {
    background-color: var(--card-bg);
    border: 1px solid var(--border);
    border-top: 2px solid var(--green);
    padding: 32px;
    border-radius: 8px;
    text-align: left;
    transition: transform 0.25s, box-shadow 0.25s;
}

.card:nth-child(even) { border-top-color: var(--blue); }

.card:hover {
    transform: translateY(-6px);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.45);
}

.card label {
    display: block;
    font-family: 'JetBrains Mono', monospace;
    font-weight: 600;
    color: var(--green);
    margin-bottom: 12px;
    font-size: 0.78rem;
    letter-spacing: 2px;
}

.card:nth-child(even) label { color: var(--blue); }

.card h3 {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text);
    margin: 0 0 12px;
    line-height: 1.3;
}

.card p {
    margin: 0;
    color: var(--muted);
    line-height: 1.65;
    font-size: 0.95rem;
}

/* ── Signal Line ────────────────────────────────────────────────── */

.signal-line {
    text-align: center;
    padding: 60px 20px 80px;
    position: relative;
    z-index: 10;
}

.signal-inner { max-width: 600px; margin: 0 auto; }

.signal-status {
    font-family: 'JetBrains Mono', monospace;
    letter-spacing: 3px;
    font-size: 0.8rem;
    color: var(--green);
    margin: 0 0 20px;
}

.signal-cta {
    display: inline-block;
    text-decoration: none;
    background-color: var(--green);
    color: #0D1117;
    padding: 16px 36px;
    border-radius: 6px;
    font-weight: 700;
    font-size: 1rem;
    margin: 8px 0;
    transition: background-color 0.2s, transform 0.2s;
}

.signal-cta:hover, .signal-cta:focus {
    background-color: var(--blue);
    color: #0D1117;
    transform: translateY(-2px);
}

.signal-sub {
    color: var(--muted);
    margin: 16px 0 0;
    font-size: 0.9rem;
}

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

@media (max-width: 480px) {
    .signal-cta { padding: 14px 28px; }
}