* { box-sizing: border-box; }
body { font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif; margin: 0; background: #f1f5f9; color: #1e293b; }
main { max-width: 860px; margin: 0 auto; padding: 16px; }
h1 { font-size: 22px; margin: 8px 0; }
h2 { font-size: 18px; margin: 20px 0 8px; }
h3 { font-size: 15px; margin: 16px 0 8px; }
.top { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 8px; }
.muted { color: #64748b; font-size: 13px; line-height: 1.6; }
.hint { color: #475569; font-size: 14px; line-height: 1.6; }
.err { background: #fef2f2; color: #b91c1c; border: 1px solid #fecaca; padding: 10px 12px; border-radius: 8px; font-size: 14px; }
.tabs { display: flex; flex-wrap: wrap; gap: 6px; margin: 12px 0; }
.tabs button { flex: 1 1 auto; padding: 9px 6px; border: 1px solid #cbd5e1; background: #fff; color: #334155; border-radius: 8px; cursor: pointer; font-size: 14px; }
.tabs button.on { background: #2563eb; color: #fff; border-color: #2563eb; }
.tab { display: none; background: #fff; border: 1px solid #e2e8f0; border-radius: 12px; padding: 16px; margin-bottom: 16px; }
.tab.on { display: block; }
label { display: block; margin: 10px 0; font-size: 14px; }
input, select, textarea { display: block; width: 100%; margin-top: 4px; padding: 10px; border: 1px solid #cbd5e1; border-radius: 8px; font-size: 15px; background: #fff; }
input[type="checkbox"] { display: inline-block; width: auto; margin: 0 6px 0 0; vertical-align: middle; }
button { padding: 10px 16px; border: 1px solid #cbd5e1; background: #fff; color: #1e293b; border-radius: 8px; cursor: pointer; font-size: 15px; margin: 6px 6px 6px 0; }
button.primary { background: #2563eb; color: #fff; border-color: #2563eb; }
button.danger { color: #b91c1c; border-color: #fecaca; }
.grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0 12px; }
@media (max-width: 640px) { .grid { grid-template-columns: 1fr; } main { padding: 10px; } }
.cards { display: flex; flex-wrap: wrap; gap: 10px; }
.cards > div { background: #f8fafc; border: 1px solid #e2e8f0; border-radius: 10px; padding: 12px 14px; min-width: 130px; }
.cards b { font-size: 20px; display: block; }
.node-row, .log-row, .speed-row { display: flex; justify-content: space-between; gap: 8px; align-items: center; padding: 8px 0; border-bottom: 1px solid #f1f5f9; font-size: 14px; flex-wrap: wrap; }
.login-wrap { display: flex; justify-content: center; padding-top: 72px; }
.login-card { background: #fff; border: 1px solid #e2e8f0; border-radius: 14px; padding: 24px; width: 100%; max-width: 400px; }
.login-card button.primary { width: 100%; }