@import url('https://fonts.googleapis.com/css2?family=Open+Sans:wght@400;600&family=Poppins:wght@600;700&display=swap');

:root {
    --bg: #10151B;
    --ink: #EDF5E1;
    --muted: #C5C6C7;
    --accent: #5CDB95;
    --card: #05386B;
}

* { box-sizing: border-box; }

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

/* ── Animated waveform backdrop ─────────────────────────────────── */

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

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

nav {
    position: fixed; top: 0; width: 100%;
    display: flex; justify-content: space-between; align-items: center;
    padding: 1rem 2rem;
    background: rgba(16, 21, 27, 0.8);
    backdrop-filter: blur(8px);
    z-index: 20;
}

.logo {
    font-family: 'Poppins', sans-serif;
    font-size: 1.5rem;
    color: var(--ink);
}

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

.nav-link {
    text-decoration: none;
    color: var(--ink);
    border: 2px solid var(--accent);
    padding: 0.5rem 1.5rem;
    border-radius: 4px;
    transition: background 0.3s ease, color 0.3s ease;
    white-space: nowrap;
}

.nav-link:hover, .nav-link:focus {
    background: var(--accent);
    color: var(--bg);
}

@media (max-width: 480px) {
    .logo { font-size: 1.2rem; }
    .nav-link { padding: 0.4rem 1rem; }
}

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

.hero {
    padding: 12vh 2rem 4rem;
    text-align: center;
    z-index: 10;
    position: relative;
}

.brand-h1 {
    font-family: 'Poppins', sans-serif;
    font-size: clamp(2rem, 6vw, 3.5rem);
    margin: 0 0 1rem;
    line-height: 1.2;
    color: var(--ink);
}

.hero-tagline {
    max-width: 680px;
    margin: 0 auto;
    color: var(--muted);
    font-size: 1.1rem;
    line-height: 1.6;
}

@media (max-width: 480px) {
    .brand-h1 { font-size: 2rem; }
}

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

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 24px;
    padding: 4rem 2rem 0;
    z-index: 10;
    position: relative;
}

.card {
    background: var(--card);
    padding: 40px;
    border-radius: 8px;
    box-shadow: 0px 4px 20px rgba(0, 0, 0, 0.2);
    transition: transform 0.3s ease;
    text-align: left;
}

.card:hover {
    transform: translateY(-10px);
}

.card-label {
    display: block;
    font-size: 0.75rem;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--accent);
}

.card h3 {
    font-family: 'Poppins', sans-serif;
    font-size: 1.5rem;
    margin: 1rem 0;
    color: var(--ink);
}

.card p {
    color: var(--muted);
    margin: 0;
    line-height: 1.6;
}

@media (max-width: 480px) {
    .card { padding: 20px; }
}

/* ── Signal Line (CTA) ──────────────────────────────────────────── */

.signal-line {
    text-align: center;
    padding: 4rem 2rem;
    z-index: 10;
    position: relative;
}

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

.signal-status {
    color: var(--accent);
    font-size: 1rem;
    margin: 0.5rem 0;
}

.signal-cta {
    text-decoration: none;
    color: var(--ink);
    padding: 0.75rem 2rem;
    border: 2px solid var(--accent);
    border-radius: 4px;
    display: inline-block;
    margin: 1rem 0;
    font-weight: 600;
    transition: background 0.3s ease, color 0.3s ease;
}

.signal-cta:hover, .signal-cta:focus {
    background: var(--accent);
    color: var(--bg);
}

.signal-sub {
    color: var(--accent);
    font-size: 1rem;
    margin: 0.5rem 0;
}