@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@500;700&family=Inter:wght@400;500;700&display=swap');

:root {
    --bg: #060D1A;
    --card-bg: rgba(59, 130, 246, 0.05);
    --blue: #3B82F6;
    --green: #10B981;
    --text: #E2EEFF;
    --muted: #6B7FA8;
    --border: rgba(59, 130, 246, 0.18);
}

*, *::before, *::after { box-sizing: border-box; }

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

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

nav {
    position: sticky;
    top: 0;
    width: 100%;
    padding: 16px 8%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(6, 13, 26, 0.92);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    z-index: 100;
}

.logo {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text);
    letter-spacing: -0.02em;
}

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

.nav-link {
    background-color: var(--blue);
    color: #ffffff;
    padding: 10px 22px;
    text-decoration: none;
    border-radius: 5px;
    font-weight: 700;
    font-size: 0.88rem;
    letter-spacing: 0.3px;
    transition: background-color 0.25s, transform 0.2s;
    white-space: nowrap;
}

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

@media (max-width: 480px) {
    nav { padding: 14px 5%; }
    .logo { font-size: 1.15rem; }
    .nav-link { padding: 8px 16px; }
}

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

.hero {
    padding: 12vh 8% 6vh;
    text-align: center;
    position: relative;
    z-index: 10;
    max-width: 900px;
    margin: 0 auto;
}

h1 {
    font-family: 'IBM Plex Mono', monospace;
    font-size: clamp(2rem, 5.5vw, 4.4rem);
    font-weight: 700;
    margin: 0 0 8px;
    line-height: 1.1;
    letter-spacing: -0.03em;
    color: var(--text);
}

h1 span { color: var(--green); }

.hero-text {
    max-width: 640px;
    margin: 24px auto 0;
    color: var(--muted);
    font-size: 1.05rem;
    line-height: 1.7;
}

@media (max-width: 768px) {
    .hero-text { padding: 0 20px; }
}

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

.cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 20px;
    padding: 20px 8% 0;
    max-width: 1200px;
    margin: 0 auto;
    position: relative;
    z-index: 10;
}

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

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

.card:hover {
    transform: translateY(-8px);
    box-shadow: 0 14px 40px rgba(59, 130, 246, 0.10);
}

.card label {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--blue);
    display: block;
    margin-bottom: 12px;
    letter-spacing: 2px;
}

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

.card h3 {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--text);
    margin: 0 0 12px;
    line-height: 1.3;
}

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

/* ── CTA ────────────────────────────────────────────────────────── */

.cta {
    padding: 50px 20px 80px;
    text-align: center;
    position: relative;
    z-index: 10;
}

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

.signal-status {
    color: var(--muted);
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.76rem;
    letter-spacing: 4px;
    text-transform: uppercase;
    margin: 0 0 22px;
}

.signal-cta {
    display: inline-block;
    background-color: var(--blue);
    color: #ffffff;
    padding: 16px 42px;
    text-decoration: none;
    font-weight: 700;
    font-size: 0.95rem;
    letter-spacing: 1px;
    border-radius: 5px;
    transition: background-color 0.25s, transform 0.2s;
}

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

.signal-sub {
    color: var(--muted);
    margin: 18px 0 0;
    font-size: 0.88rem;
}

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

@media (max-width: 480px) {
    .card { padding: 26px 22px; }
    .signal-cta { padding: 14px 30px; }
}