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

:root {
    --cloud: #f8faff;
    --cloud-2: #eef2ff;
    --flow: #2563eb;
    --flow-light: #dbeafe;
    --stream: #06b6d4;
    --chat: #7c3aed;
    --chat-light: #ede9fe;
    --ink: #1e293b;
    --muted: #64748b;
    --white: #ffffff;
    --border: rgba(37, 99, 235, 0.12);
}

* { box-sizing: border-box; }

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

main { position: relative; z-index: 10; }

/* ── Flowing stream canvas ──────────────────────────────────────── */

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

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

.flow-nav {
    display: flex; justify-content: space-between; align-items: center;
    padding: 18px 8%;
    background: rgba(248, 250, 255, 0.88);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    position: sticky; top: 0; z-index: 100;
    border-bottom: 1px solid var(--border);
}

.logo {
    font-family: 'Plus Jakarta Sans', sans-serif;
    font-size: 1.45rem;
    font-weight: 800;
    letter-spacing: -0.4px;
}

.logo-flow { color: var(--flow); }
.logo-chat { color: var(--chat); }

.nav-link {
    padding: 10px 22px;
    background-color: var(--flow);
    color: var(--white);
    text-decoration: none;
    font-weight: 700;
    font-size: 0.88rem;
    border-radius: 8px;
    transition: background-color 0.25s ease;
    white-space: nowrap;
}

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

@media (max-width: 650px) {
    .flow-nav { padding: 14px 5%; }
    .logo { font-size: 1.2rem; }
    .nav-link { padding: 8px 14px; font-size: 0.82rem; }
}

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

.hero {
    max-width: 860px; margin: 0 auto;
    padding: 13vh 20px 5vh;
    text-align: center;
    position: relative; z-index: 10;
}

.eyebrow {
    font-size: 0.7rem;
    letter-spacing: 4px;
    text-transform: uppercase;
    color: var(--stream);
    font-weight: 700;
    margin: 0 0 22px;
}

.brand-h1 {
    font-family: 'Plus Jakarta Sans', sans-serif;
    font-size: clamp(2.8rem, 8vw, 5.5rem);
    font-weight: 800;
    margin: 0 0 26px;
    line-height: 1.06;
    letter-spacing: -2px;
    color: var(--ink);
}

.hero-tagline {
    max-width: 580px; margin: 0 auto;
    color: var(--muted);
    font-size: 1.05rem;
    line-height: 1.78;
    font-weight: 400;
}

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

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 20px;
    max-width: 1080px; margin: 0 auto;
    padding: 10px 20px 64px;
    position: relative; z-index: 10;
}

.card {
    background-color: var(--white);
    border: 1px solid var(--border);
    padding: 34px 30px;
    border-radius: 12px;
    text-align: left;
    box-shadow: 0 2px 12px rgba(37, 99, 235, 0.06);
    transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}

.card:hover {
    transform: translateY(-6px);
    border-color: rgba(124, 58, 237, 0.25);
    box-shadow: 0 12px 32px rgba(124, 58, 237, 0.1);
}

.card-tag {
    font-size: 0.68rem;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--flow);
    font-weight: 700;
    margin-bottom: 14px;
    display: block;
}

.card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin: 0 0 10px;
    color: var(--ink);
    letter-spacing: -0.2px;
}

.card p {
    margin: 0;
    color: var(--muted);
    line-height: 1.72;
    font-size: 0.93rem;
}

@media (max-width: 600px) {
    .card { padding: 26px 22px; }
}

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

.signal-line {
    padding: 40px 20px 100px;
    text-align: center;
    position: relative; z-index: 10;
}

.signal-inner { max-width: 500px; margin: 0 auto; }

.signal-status {
    font-size: 0.7rem;
    letter-spacing: 4px;
    text-transform: uppercase;
    color: var(--stream);
    font-weight: 700;
    margin-bottom: 22px;
}

.signal-cta {
    display: inline-block;
    padding: 15px 42px;
    background: linear-gradient(135deg, var(--flow) 0%, var(--chat) 100%);
    color: var(--white);
    text-decoration: none;
    font-weight: 700;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    font-size: 0.88rem;
    border-radius: 8px;
    transition: opacity 0.25s ease, transform 0.25s ease;
}

.signal-cta:hover, .signal-cta:focus {
    opacity: 0.88;
    transform: translateY(-2px);
}

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

@media (max-width: 480px) {
    .hero { padding: 10vh 16px 4vh; }
    .brand-h1 { font-size: 2.6rem; letter-spacing: -1px; }
    .hero-tagline { font-size: 0.97rem; }
}

@media (prefers-reduced-motion: reduce) {
    .card, .signal-cta { transition: none; }
}