:root {
    color-scheme: dark;
    --background: #02070c;
    --surface: #101820;
    --surface-soft: #15222d;
    --text: #f5f7fa;
    --muted: #9aa8b5;
    --accent: #58b8ff;
    --border: rgba(88, 184, 255, 0.28);
    --max-width: 920px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
    margin: 0;
    min-height: 100vh;
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", sans-serif;
    color: var(--text);
    background:
        radial-gradient(circle at 18% 0%, rgba(22, 123, 190, 0.28), transparent 34rem),
        var(--background);
    line-height: 1.65;
}

a { color: var(--accent); }

.site-header {
    position: sticky;
    top: 0;
    z-index: 10;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    background: rgba(2, 7, 12, 0.82);
    backdrop-filter: blur(20px);
}

.nav {
    width: min(calc(100% - 32px), var(--max-width));
    margin: auto;
    min-height: 68px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}

.brand {
    color: var(--text);
    text-decoration: none;
    font-size: 1.15rem;
    font-weight: 800;
    letter-spacing: 0.02em;
}

.nav-links { display: flex; gap: 18px; flex-wrap: wrap; }
.nav-links a { color: var(--muted); text-decoration: none; font-size: 0.92rem; }
.nav-links a:hover { color: var(--text); }

main {
    width: min(calc(100% - 32px), var(--max-width));
    margin: auto;
    padding: 72px 0 96px;
}

.hero { padding: 40px 0 72px; max-width: 760px; }
.eyebrow { color: var(--accent); font-weight: 750; letter-spacing: 0.12em; font-size: 0.78rem; }
h1 { font-size: clamp(2.5rem, 8vw, 5rem); line-height: 1.02; margin: 16px 0 24px; letter-spacing: -0.045em; }
h2 { margin: 2.4rem 0 0.8rem; font-size: 1.45rem; }
h3 { margin: 1.7rem 0 0.5rem; font-size: 1.08rem; }
p, li { color: #c7d0d8; }
.lead { color: var(--muted); font-size: 1.18rem; max-width: 650px; }

.button {
    display: inline-block;
    margin-top: 16px;
    padding: 12px 20px;
    border-radius: 999px;
    color: #001522;
    background: var(--accent);
    font-weight: 750;
    text-decoration: none;
}

.grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.card {
    padding: 24px;
    border: 1px solid rgba(255, 255, 255, 0.09);
    border-radius: 22px;
    background: linear-gradient(145deg, rgba(25, 39, 51, 0.95), rgba(10, 16, 22, 0.95));
    text-decoration: none;
}
.card:hover { border-color: var(--border); transform: translateY(-1px); }
.card strong { color: var(--text); display: block; margin-bottom: 6px; }
.card span { color: var(--muted); }

.document {
    padding: clamp(22px, 5vw, 48px);
    border: 1px solid rgba(255, 255, 255, 0.09);
    border-radius: 28px;
    background: rgba(13, 21, 28, 0.9);
}
.document h1 { font-size: clamp(2.1rem, 6vw, 3.6rem); }
.updated { color: var(--muted); margin-bottom: 2.5rem; }
.notice { padding: 16px 18px; border-left: 3px solid var(--accent); background: var(--surface-soft); border-radius: 8px; }

footer {
    width: min(calc(100% - 32px), var(--max-width));
    margin: auto;
    padding: 28px 0 48px;
    color: var(--muted);
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    font-size: 0.9rem;
}

@media (max-width: 700px) {
    .nav { align-items: flex-start; padding: 18px 0; }
    .nav-links { justify-content: flex-end; gap: 10px 14px; }
    .grid { grid-template-columns: 1fr; }
    main { padding-top: 42px; }
}