:root {
  --c-primary: #1e40af;
  --c-primary-hover: #1e3a8a;
  --c-on-primary: #fff;
  --c-bg: #f8fafc;
  --c-card: #fff;
  --c-fg: #0f172a;
  --c-muted: #e9eef6;
  --c-muted-fg: #475569;
  --c-border: #cbd5e1;
  --c-danger: #b91c1c;
  --c-danger-bg: #fef2f2;
  --c-warn: #92400e;
  --radius: 6px;
  --s1: 4px; --s2: 8px; --s3: 12px; --s4: 16px; --s5: 24px;
  --font: system-ui, -apple-system, "Segoe UI", "Microsoft YaHei", sans-serif;
  --mono: ui-monospace, "Cascadia Mono", Consolas, monospace;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
body { margin: 0; font: 15px/1.5 var(--font); color: var(--c-fg); background: var(--c-bg); }
code { font-family: var(--mono); font-size: .9em; }
h1 { margin: 0; font-size: 1.25rem; }
h2 { margin: 0 0 var(--s2); font-size: 1rem; }
.muted { color: var(--c-muted-fg); }
.small { font-size: .85rem; margin: var(--s1) 0 0; }
.noscript { padding: var(--s5); text-align: center; }

.card { background: var(--c-card); border: 1px solid var(--c-border); border-radius: var(--radius); padding: var(--s4); }

/* 登录/改密 */
.auth { min-height: 100vh; display: grid; place-items: center; padding: var(--s4); }
.auth-card { width: min(380px, 100%); display: flex; flex-direction: column; gap: var(--s3); }
.auth-card h1 { font-size: 1.35rem; }
.auth-card p { margin: 0; }

/* 顶栏 */
.topbar { display: flex; justify-content: space-between; align-items: center; gap: var(--s4); flex-wrap: wrap;
  padding: var(--s3) var(--s5); background: var(--c-card); border-bottom: 1px solid var(--c-border); }
.account { display: flex; align-items: center; gap: var(--s3); flex-wrap: wrap; }
.who { font-weight: 600; }
.quota { display: flex; gap: var(--s3); margin: 0; }
.quota div { background: var(--c-muted); border-radius: 4px; padding: 2px var(--s2); }
.quota dt { display: inline; font-size: .8rem; color: var(--c-muted-fg); margin-right: 4px; }
.quota dd { display: inline; margin: 0; font-family: var(--mono); font-weight: 600; }
.quota .warn dd { color: var(--c-danger); }

.layout { display: grid; gap: var(--s4); padding: var(--s4); grid-template-columns: minmax(340px, 460px) 1fr; align-items: start; }
@media (max-width: 1000px) { .layout { grid-template-columns: 1fr; } }

fieldset { border: 1px solid var(--c-muted); border-radius: var(--radius); margin: 0 0 var(--s3); padding: var(--s3); }
legend { font-weight: 600; padding: 0 var(--s1); }
legend small { font-weight: 400; color: var(--c-muted-fg); }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: var(--s2) var(--s3); }
@media (max-width: 420px) { .grid2 { grid-template-columns: 1fr; } }
label { display: flex; flex-direction: column; gap: 2px; font-size: .875rem; }
label.inline { flex-direction: row; align-items: center; gap: var(--s1); }
label.inline input { width: 72px; }
label small, .help { color: var(--c-muted-fg); font-size: .8rem; }
.help { margin: var(--s1) 0 var(--s2); }

input, select {
  font: inherit; font-family: var(--mono); font-size: .9rem;
  padding: 6px 8px; min-height: 38px; border: 1px solid var(--c-border); border-radius: 4px;
  background: #fff; color: var(--c-fg); width: 100%;
}
input:focus-visible, select:focus-visible, .btn:focus-visible, canvas:focus-visible { outline: 2px solid var(--c-primary); outline-offset: 2px; }
input[aria-invalid="true"] { border-color: var(--c-danger); }

.events-edit { width: 100%; border-collapse: collapse; table-layout: fixed; }
.events-edit th:nth-child(1) { width: 25%; }
.events-edit th:nth-child(2) { width: 28%; }
.events-edit th:nth-child(3), .events-edit th:nth-child(4) { width: auto; }
.events-edit th:nth-child(5) { width: 44px; }
.events-edit input, .events-edit select { padding: 6px 6px; }
.events-edit th { text-align: left; font-size: .8rem; font-weight: 500; color: var(--c-muted-fg); padding: 0 3px 4px; }
.events-edit td { padding: 2px 3px; }


.btn { font: inherit; cursor: pointer; border-radius: 4px; border: 1px solid transparent; padding: 8px 14px; min-height: 40px;
  transition: background-color .15s, border-color .15s, color .15s; }
.btn:disabled { cursor: not-allowed; opacity: .6; }
.btn.block { width: 100%; }
.btn.primary { background: var(--c-primary); color: var(--c-on-primary); }
.btn.primary:hover:not(:disabled) { background: var(--c-primary-hover); }
.btn.secondary { background: #fff; color: var(--c-primary); border-color: var(--c-border); }
.btn.secondary:hover:not(:disabled) { background: var(--c-muted); }
.btn.link { background: transparent; color: var(--c-primary); padding: 8px 6px; }
.btn.link:hover { text-decoration: underline; }
a.btn { display: inline-flex; align-items: center; justify-content: center; text-decoration: none; }
.btn.icon { padding: 0; width: 40px; display: inline-grid; place-items: center; background: transparent; color: var(--c-muted-fg); }
.btn.icon:hover { color: var(--c-danger); background: var(--c-danger-bg); }
.actions { display: flex; gap: var(--s2); flex-wrap: wrap; align-items: center; }

.form-error:empty { display: none; }
.form-error { color: var(--c-danger); background: var(--c-danger-bg); border: 1px solid #fecaca; border-radius: 4px;
  padding: var(--s2) var(--s3); font-size: .875rem; }
.form-error ul { margin: 0; padding-left: 1.2em; }

.result-head { display: flex; justify-content: space-between; align-items: center; gap: var(--s3); margin-bottom: var(--s2); }
.result-head h2 { margin: 0; }
.chart-wrap { position: relative; }
canvas { width: 100%; height: 420px; display: block; border: 1px solid var(--c-muted); border-radius: 4px; background: #fff; cursor: crosshair; }
.readout { position: absolute; top: 8px; right: 12px; font-family: var(--mono); font-size: .8rem;
  background: rgba(255,255,255,.92); padding: 2px 6px; border-radius: 4px; color: var(--c-muted-fg); }
.readout:empty, .chart-msg:empty { display: none; }
.chart-msg { position: absolute; inset: 0; display: grid; place-items: center; color: var(--c-muted-fg); font-size: .9rem; pointer-events: none; }

.summary { display: grid; grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: var(--s2); margin: var(--s3) 0 var(--s4); }
.summary div { background: var(--c-muted); border-radius: 4px; padding: var(--s2) var(--s3); }
.summary dt { font-size: .75rem; color: var(--c-muted-fg); }
.summary dd { margin: 0; font-family: var(--mono); font-weight: 600; }

.table-scroll { overflow-x: auto; }
.events-out { width: 100%; border-collapse: collapse; font-size: .875rem; }
.events-out th, .events-out td { padding: 6px 8px; border-bottom: 1px solid var(--c-muted); text-align: right; white-space: nowrap; }
.events-out th:nth-child(2), .events-out td:nth-child(2) { text-align: left; }
.events-out td { font-family: var(--mono); }
.events-out tbody tr:hover { background: #f1f5f9; }

.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

@media (prefers-reduced-motion: reduce) { * { transition: none !important; } }