:root {
    --ink: #14181f;
    --ink-dim: #5b6472;
    --line: #d7dbe1;
    --line-soft: #ebedf0;
    --bg: #ffffff;
    --bg-alt: #fafbfc;
    --accent: #0a5c9e;
    --warn-line: #b8860b;
    --warn-bg: #fdfaf2;
    --mono: ui-monospace, "SF Mono", "Roboto Mono", Consolas, monospace;
    --sans: -apple-system, "Segoe UI", Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    height: 100%;
    font-family: var(--sans);
    background: var(--bg);
    color: var(--ink);
    font-size: 14px;
    line-height: 1.5;
}

header {
    border-bottom: 1px solid var(--line);
    padding: 14px 24px;
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 10px;
}

header .wordmark {
    font-weight: 700;
    font-size: 15px;
    letter-spacing: 0.02em;
    color: var(--ink);
}

header .wordmark span { color: var(--accent); }

header .tag { font-size: 12px; color: var(--ink-dim); }

.tag {
    display: inline-block;
    padding: 2px 8px;
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    font-weight: 700;
    border: 1px solid currentColor;
    font-family: var(--sans);
}

.hero {
    max-width: 880px;
    margin: 0 auto;
    padding: 64px 24px 40px;
    text-align: center;
}

.hero h1 {
    font-size: 28px;
    font-weight: 700;
    margin: 0 0 10px;
    letter-spacing: -0.01em;
}

.hero h1 span { color: var(--accent); }

.hero p {
    font-size: 14.5px;
    color: var(--ink-dim);
    max-width: 520px;
    margin: 0 auto;
}

.container {
    max-width: 880px;
    margin: 0 auto;
    padding: 0 24px 60px;
}

.nav-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    border-top: 1px solid var(--line);
    border-left: 1px solid var(--line);
}

.nav-card {
    display: block;
    border-right: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
    padding: 28px 26px;
    text-decoration: none;
    color: inherit;
    background: var(--bg);
    transition: background 0.12s ease;
}

.nav-card:hover {
    background: var(--bg-alt);
}

.nav-card:hover .nav-title {
    color: var(--accent);
}

.nav-index {
    font-family: var(--mono);
    font-size: 11px;
    color: var(--ink-dim);
    letter-spacing: 0.04em;
    margin-bottom: 10px;
}

.nav-title {
    font-size: 17px;
    font-weight: 700;
    margin: 0 0 8px;
    color: var(--ink);
}

.nav-desc {
    font-size: 13px;
    color: var(--ink-dim);
    margin: 0 0 14px;
}

.nav-path {
    font-family: var(--mono);
    font-size: 11.5px;
    color: var(--accent);
}

.nav-path::after {
    content: " →";
}

.warning {
    border: 1px solid var(--warn-line);
    background: var(--warn-bg);
    padding: 14px 16px;
    font-size: 13px;
    line-height: 1.5;
    margin-top: 32px;
}

.warning strong {
    display: block;
    margin-bottom: 6px;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

footer {
    border-top: 1px solid var(--line);
    padding: 22px 24px 30px;
}

.footer-inner {
    max-width: 880px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    flex-wrap: wrap;
    gap: 10px;
    font-size: 12px;
    color: var(--ink-dim);
}

.footer-inner a {
    color: var(--ink-dim);
    text-decoration: none;
    border-bottom: 1px solid var(--line);
}

.footer-inner a:hover {
    color: var(--accent);
    border-color: var(--accent);
}

.footer-contacts {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

@media (max-width: 600px) {
    .nav-grid { grid-template-columns: 1fr; }
    .hero { padding: 44px 20px 32px; }
    .hero h1 { font-size: 23px; }
    .footer-inner { flex-direction: column; }
}