:root {
    --bg: #08080a;
    --panel: rgba(24, 24, 29, 0.82);
    --border: rgba(255, 255, 255, 0.09);
    --text: #f5f5f7;
    --muted: #a4a4ad;
    --accent: #ff6b57;
    --accent-soft: rgba(255, 107, 87, 0.12);
}

* {
    box-sizing: border-box;
}

html {
    color-scheme: dark;
    scroll-behavior: smooth;
}

body {
    margin: 0;
    min-height: 100vh;
    color: var(--text);
    background:
        radial-gradient(circle at 15% 0%, rgba(255, 107, 87, 0.12), transparent 30rem),
        radial-gradient(circle at 85% 15%, rgba(103, 86, 255, 0.08), transparent 28rem), var(--bg);
    font-family: Inter, system-ui, sans-serif;
    line-height: 1.72;
}

a {
    color: inherit;
}

.document-shell {
    width: min(1120px, calc(100% - 32px));
    margin: 0 auto;
    padding: 28px 0 72px;
}

.document-topbar {
    position: sticky;
    top: 16px;
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    padding: 14px 18px;
    border: 1px solid var(--border);
    border-radius: 18px;
    background: rgba(14, 14, 18, 0.82);
    box-shadow: 0 18px 60px rgba(0, 0, 0, 0.32);
    backdrop-filter: blur(20px);
}

.document-brand,
.document-back {
    display: inline-flex;
    align-items: center;
    gap: 9px;
    font-weight: 800;
    text-decoration: none;
}

.document-brand i,
.document-back i {
    color: var(--accent);
}

.document-back {
    padding: 9px 13px;
    border: 1px solid var(--border);
    border-radius: 11px;
    color: #d5d5da;
    font-size: 13px;
}

.document-back:hover {
    background: rgba(255, 255, 255, 0.05);
}

.document-hero {
    padding: 92px 8px 34px;
}

.document-kicker {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 7px 11px;
    border: 1px solid rgba(255, 107, 87, 0.25);
    border-radius: 999px;
    color: #ff9b8d;
    background: var(--accent-soft);
    font-size: 12px;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

h1 {
    max-width: 800px;
    margin: 18px 0 12px;
    font-family: Orbitron, Inter, sans-serif;
    font-size: clamp(34px, 6vw, 64px);
    line-height: 1.05;
    letter-spacing: -0.04em;
}

.document-lead {
    max-width: 780px;
    margin: 0;
    color: var(--muted);
    font-size: 17px;
}

.document-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 10px 20px;
    margin-top: 22px;
    color: #7f7f89;
    font-size: 13px;
}

.document-grid {
    display: grid;
    grid-template-columns: 260px minmax(0, 1fr);
    gap: 24px;
    align-items: start;
}

.document-nav,
.document-content {
    border: 1px solid var(--border);
    border-radius: 22px;
    background: var(--panel);
    box-shadow: 0 22px 70px rgba(0, 0, 0, 0.24);
    backdrop-filter: blur(18px);
}

.document-nav {
    position: sticky;
    top: 92px;
    display: grid;
    gap: 5px;
    padding: 14px;
}

.document-nav strong {
    padding: 8px 10px 12px;
    color: #fff;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.document-nav a {
    padding: 10px;
    border-radius: 10px;
    color: var(--muted);
    font-size: 13px;
    text-decoration: none;
}

.document-nav a:hover,
.document-nav a.current {
    color: #fff;
    background: rgba(255, 107, 87, 0.11);
}

.document-content {
    padding: clamp(24px, 5vw, 52px);
}

.document-content section + section {
    margin-top: 38px;
    padding-top: 38px;
    border-top: 1px solid var(--border);
}

.document-content h2 {
    margin: 0 0 14px;
    color: #fff;
    font-size: 22px;
    line-height: 1.3;
}

.document-content h3 {
    margin: 24px 0 8px;
    font-size: 16px;
}

.document-content p {
    margin: 10px 0;
    color: #c4c4cb;
}

.document-content ul {
    margin: 12px 0;
    padding-left: 22px;
    color: #c4c4cb;
}

.document-content li + li {
    margin-top: 8px;
}

.document-note {
    margin: 20px 0;
    padding: 16px 18px;
    border: 1px solid rgba(255, 107, 87, 0.24);
    border-radius: 14px;
    color: #f5d1cb;
    background: rgba(255, 107, 87, 0.08);
}

.document-footer {
    display: flex;
    justify-content: space-between;
    gap: 20px;
    margin-top: 24px;
    padding: 20px 8px;
    color: #777782;
    font-size: 12px;
}

@media (max-width: 780px) {
    .document-grid {
        grid-template-columns: 1fr;
    }

    .document-nav {
        position: static;
        grid-template-columns: repeat(2, 1fr);
    }

    .document-nav strong {
        grid-column: 1 / -1;
    }

    .document-hero {
        padding-top: 70px;
    }
}

@media (max-width: 520px) {
    .document-topbar {
        top: 8px;
    }

    .document-brand span {
        display: none;
    }

    .document-nav {
        grid-template-columns: 1fr;
    }

    .document-footer {
        flex-direction: column;
    }
}