:root {
    --bg: #f6f7fb;
    --panel: #ffffff;
    --text: #1f2937;
    --muted: #6b7280;
    --line: #d9deea;
    --accent: #0b6bcb;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    padding: 0;
    color: var(--text);
    font: 16px/1.6 "Segoe UI", "Noto Sans", "Helvetica Neue", Arial, sans-serif;
}

.page {
    max-width: 980px;
    margin: 36px auto;
    padding: 0 18px;
}

.card {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 14px;
    box-shadow: 0 8px 30px rgba(17, 24, 39, 0.06);
    padding: 26px;
}

h1, h2, h3 {
    line-height: 1.25;
    margin-top: 1.2em;
}

h1 { margin-top: 0; }

a {
    color: var(--accent);
    text-decoration: none;
}

a:hover { text-decoration: underline; }

table {
    width: 100%;
    border-collapse: collapse;
    display: block;
    overflow-x: auto;
}

th, td {
    border: 1px solid var(--line);
    padding: 0.55rem 0.65rem;
    text-align: left;
    vertical-align: top;
}

th {
    background: #f2f5ff;
}

ul {
    margin-top: 0.5em;
}

code {
    background: #f3f4f6;
    border: 1px solid #e5e7eb;
    border-radius: 6px;
    padding: 0.05rem 0.3rem;
}

hr {
    border: 0;
    border-top: 1px solid var(--line);
    margin: 1.4rem 0;
}

.meta {
    color: var(--muted);
    font-size: 0.95rem;
}

@media (max-width: 720px) {
    .page { margin: 18px auto; }
    .card { padding: 16px; border-radius: 10px; }
}