:root {
    --bg: #f7f8fb;
    --surface: #ffffff;
    --text: #1f2430;
    --muted: #5d6475;
    --accent: #3b6df0;
    --accent-soft: #e8eefe;
    --border: #e1e5ee;
    --code-bg: #1e1f29;
    --code-text: #e8e8f2;
}
@media (prefers-color-scheme: dark) {
    :root {
        --bg: #14161d;
        --surface: #1d2029;
        --text: #e8eaf1;
        --muted: #a2a9bb;
        --accent: #7c9cff;
        --accent-soft: #263154;
        --border: #2d3140;
        --code-bg: #0e0f15;
    }
}
* { box-sizing: border-box; }
body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font: 17px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
.wrap { max-width: 920px; margin: 0 auto; padding: 0 20px; }
a { color: var(--accent); }

.site-header { background: var(--surface); border-bottom: 1px solid var(--border); }
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 8px; padding-top: 14px; padding-bottom: 14px; }
.brand { font-size: 1.35rem; font-weight: 700; text-decoration: none; color: var(--text); }
nav a { margin-left: 18px; text-decoration: none; color: var(--muted); font-weight: 500; }
nav a:hover, nav a.active { color: var(--accent); }

main { padding-top: 32px; padding-bottom: 48px; }
.hero { text-align: center; padding: 24px 0 36px; }
.hero h1 { font-size: 2.2rem; margin: 0 0 8px; }
.hero p { color: var(--muted); margin: 0 auto; max-width: 560px; }

h2 { margin-top: 36px; }
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 16px; }
.card {
    display: block; background: var(--surface); border: 1px solid var(--border);
    border-radius: 14px; padding: 18px 20px; text-decoration: none; color: var(--text);
    transition: transform .12s, border-color .12s;
}
.card:hover { transform: translateY(-2px); border-color: var(--accent); }
.card h3 { margin: 0 0 4px; }
.card p { margin: 0; color: var(--muted); font-size: .95rem; }
.tag { display: inline-block; background: var(--accent-soft); color: var(--accent); border-radius: 999px; padding: 2px 10px; font-size: .8rem; font-weight: 600; margin-bottom: 8px; }

pre.code { background: var(--code-bg); color: var(--code-text); padding: 16px; border-radius: 12px; overflow-x: auto; font: 15px/1.5 Consolas, "Courier New", monospace; }
.empty { color: var(--muted); font-style: italic; }
.muted { color: var(--muted); }

.tabs { display: flex; gap: 8px; margin-bottom: 12px; flex-wrap: wrap; }
.tabs button { border: 1px solid var(--border); background: var(--surface); color: var(--text); padding: 8px 16px; border-radius: 999px; font: inherit; cursor: pointer; }
.tabs button.on { background: var(--accent); border-color: var(--accent); color: #fff; }
.panel { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 4px 20px; }
.notes li { margin-bottom: 8px; }

.comment { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 10px 18px; margin-bottom: 12px; }
.comment p { margin: 4px 0 8px; }
.notice { background: var(--accent-soft); border-radius: 10px; padding: 10px 14px; }
.error { background: #fde8e8; color: #9b1c1c; border-radius: 10px; padding: 10px 14px; }

.form label { display: block; margin-bottom: 12px; font-weight: 500; }
.form input[type=text], .form input[type=password], .form select, .form textarea { display: block; width: 100%; margin-top: 4px; padding: 10px 12px; border: 1px solid var(--border); border-radius: 10px; background: var(--surface); color: var(--text); font: inherit; }
.form button { background: var(--accent); color: #fff; border: 0; border-radius: 10px; padding: 10px 22px; font: inherit; font-weight: 600; cursor: pointer; }
.hp { position: absolute; left: -9999px; height: 0; width: 0; opacity: 0; }
.form textarea.mono { font-family: Consolas, "Courier New", monospace; font-size: 15px; }
.form input[type=checkbox] { margin-right: 6px; }
.site-footer { border-top: 1px solid var(--border); color: var(--muted); font-size: .9rem; padding: 18px 0; text-align: center; }