:root {
  --bg: #0b1020;
  --card: #141a2e;
  --text: #e6e9f2;
  --muted: #9aa3b5;
  --accent: #f08c2e;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; background: var(--bg); color: var(--text); }
body { font-family: system-ui, -apple-system, "Segoe UI", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif; line-height: 1.65; }
.topbar { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 12px 16px; border-bottom: 1px solid #222a42; position: sticky; top: 0; background: rgba(11, 16, 32, .92); backdrop-filter: blur(6px); z-index: 10; }
.brand { color: var(--text); text-decoration: none; font-weight: 700; letter-spacing: .5px; }
nav a { color: var(--muted); text-decoration: none; margin-left: 14px; }
nav a:hover { color: var(--text); }
main { max-width: 760px; margin: 0 auto; padding: 16px; }
.card { background: var(--card); border: 1px solid #222a42; border-radius: 14px; padding: 16px 18px; margin: 14px 0; }
.hero h1 { margin: 2px 0 6px; font-size: 22px; }
.tagline { color: var(--accent); margin: 0 0 10px; }
.muted { color: var(--muted); font-size: 14px; }
.kv { display: grid; grid-template-columns: max-content 1fr; gap: 6px 14px; margin: 8px 0 12px; }
.kv dt { color: var(--muted); }
.kv dd { margin: 0; }
button { font: inherit; padding: 10px 16px; border-radius: 10px; border: 1px solid #2b3654; background: #1b2440; color: var(--text); cursor: pointer; margin: 4px 6px 4px 0; }
button.secondary { background: transparent; color: var(--muted); }
.log { background: #0d1224; border: 1px solid #222a42; border-radius: 10px; padding: 10px; font-size: 12px; color: var(--muted); white-space: pre-wrap; min-height: 1.2em; }
.offline { background: #5a2a12; color: #ffd9b8; padding: 8px 16px; text-align: center; font-size: 14px; }
.foot { max-width: 760px; margin: 8px auto 28px; padding: 0 16px; color: var(--muted); font-size: 12px; }
@media (prefers-color-scheme: light) {
  :root { --bg: #f6f7fa; --card: #ffffff; --text: #1a2030; --muted: #5c667a; }
  .topbar { background: rgba(246, 247, 250, .94); border-color: #dfe3ec; }
  .card, .log { border-color: #dfe3ec; }
  button { background: #eef1f7; border-color: #d6dbe7; color: #1a2030; }
  .log { background: #f2f4f9; }
}