:root {
  --bg: #ffffff;
  --fg: #111827;
  --muted: #6b7280;
  --faint: #9ca3af;
  --line: #e8eaed;
  --soft: #f7f8f9;
  --ok: #0f7b55;
  --warn: #b45309;
  --danger: #b42318;
  --gap: 20px;
  --maxw: 960px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 14px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; }
.num { font-variant-numeric: tabular-nums; }

/* layout */
.shell { display: flex; min-height: 100vh; }

.sidebar {
  width: 216px;
  flex: 0 0 216px;
  border-right: 1px solid var(--line);
  padding: 28px 16px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.brand {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.lang-btn {
  font-size: 11px;
  line-height: 1;
  padding: 4px 8px;
  border: 1px solid var(--border, rgba(0, 0, 0, 0.12));
  border-radius: 999px;
  background: transparent;
  color: inherit;
  cursor: pointer;
  opacity: 0.75;
}

.lang-btn:hover {
  opacity: 1;
}

.auth-lang {
  display: flex;
  justify-content: flex-end;
  margin-bottom: 8px;
}
.nav-link { display: block; padding: 8px 10px; border-radius: 8px; color: var(--muted); }
.nav-link:hover { background: var(--soft); color: var(--fg); }
.nav-link[aria-current="page"] { background: var(--soft); color: var(--fg); font-weight: 500; }
.sidebar-foot { margin-top: auto; padding: 0 10px; color: var(--faint); font-size: 12px; }

.main { flex: 1; min-width: 0; padding: 28px 32px 96px; }
.main-inner { max-width: var(--maxw); margin: 0 auto; }

.page-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 24px;
}
.page-title { font-size: 20px; font-weight: 600; margin: 0; }
.page-sub { color: var(--muted); font-size: 13px; }

/* cards */
.card { border: 1px solid var(--line); border-radius: 12px; padding: 20px; }
.card + .card { margin-top: var(--gap); }
.card-tight { padding: 8px 8px 4px; }
.card-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 14px; gap: 12px; }
.card-title { font-size: 15px; font-weight: 600; margin: 0; }

.grid { display: grid; gap: var(--gap); }
.grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.stack { margin-top: var(--gap); }

.stat-label { color: var(--muted); font-size: 12px; letter-spacing: 0.04em; text-transform: uppercase; }
.stat-value { font-size: 24px; font-weight: 600; margin-top: 6px; }
.stat-value.big { font-size: 40px; letter-spacing: -0.02em; line-height: 1.1; }
.stat-note { color: var(--faint); font-size: 12px; margin-top: 4px; }

/* buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  height: 36px;
  padding: 0 14px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: var(--bg);
  cursor: pointer;
  white-space: nowrap;
}
.btn:hover { background: var(--soft); }
.btn:disabled { opacity: 0.45; cursor: not-allowed; }
.btn-primary { background: var(--fg); border-color: var(--fg); color: #fff; }
.btn-primary:hover { background: #000; }
.btn-block { width: 100%; }
.btn-sm { height: 28px; padding: 0 10px; font-size: 13px; border-radius: 6px; }
.btn-link {
  border: 0; background: none; padding: 0; height: auto;
  color: var(--muted); cursor: pointer;
  text-decoration: underline; text-underline-offset: 3px;
}
.btn-link:hover { color: var(--fg); }
.btn-danger { color: var(--danger); }

.row { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.spacer { flex: 1; }

/* fields */
.field { display: block; margin-bottom: 14px; }
.field-label { display: block; font-size: 13px; color: var(--muted); margin-bottom: 6px; }
.input, .select {
  width: 100%;
  height: 38px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--bg);
  outline: none;
}
.input:focus, .select:focus { border-color: var(--fg); }
.select { appearance: none; padding-right: 30px; }
.error { color: var(--danger); font-size: 13px; margin-bottom: 12px; }

/* tables */
.table { width: 100%; border-collapse: collapse; }
.table th {
  text-align: left; font-weight: 500; color: var(--muted);
  font-size: 12px; letter-spacing: 0.03em; text-transform: uppercase;
  padding: 0 12px 10px; border-bottom: 1px solid var(--line);
}
.table td { padding: 12px; border-bottom: 1px solid var(--line); vertical-align: middle; }
.table tr:last-child td { border-bottom: 0; }
.table td.right, .table th.right { text-align: right; }
.table tr.clickable { cursor: pointer; }
.table tr.clickable:hover td { background: var(--soft); }

.mono { font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, monospace; font-size: 13px; }

.badge { display: inline-block; font-size: 12px; padding: 1px 8px; border-radius: 999px; border: 1px solid var(--line); color: var(--muted); }
.badge-ok { color: var(--ok); border-color: rgba(15, 123, 85, 0.3); }
.badge-off { color: var(--faint); }
.badge-err { color: var(--danger); border-color: rgba(180, 35, 24, 0.3); }

.empty { color: var(--faint); padding: 28px 4px; text-align: center; }

.notice { border: 1px solid var(--line); border-radius: 12px; padding: 14px 16px; margin-bottom: var(--gap); display: flex; align-items: center; gap: 14px; }
.notice-warn { border-color: rgba(180, 83, 9, 0.28); background: rgba(180, 83, 9, 0.04); }
.notice-title { font-weight: 500; }
.notice-body { color: var(--muted); font-size: 13px; }

.fineprint { color: var(--faint); font-size: 12px; line-height: 1.6; }

.kv { display: grid; grid-template-columns: 150px 1fr; gap: 10px 16px; margin: 0; }
.kv dt { color: var(--muted); }
.kv dd { margin: 0; }

.copyline {
  display: flex; align-items: center; gap: 10px; justify-content: space-between;
  border: 1px solid var(--line); border-radius: 8px; padding: 10px 12px; background: var(--soft);
}
.copyline .mono { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* tiers */
.tiers { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 10px; }
.tier {
  border: 1px solid var(--line); border-radius: 10px; padding: 14px 10px;
  text-align: center; cursor: pointer; background: var(--bg);
}
.tier:hover { background: var(--soft); }
.tier[aria-pressed="true"] { border-color: var(--fg); background: var(--soft); }
.tier-credit { font-size: 18px; font-weight: 600; }
.tier-pay { color: var(--muted); font-size: 12px; margin-top: 2px; }

/* login */
.auth-wrap { min-height: 100vh; display: grid; place-items: center; padding: 24px; }
.auth-card { width: 100%; max-width: 340px; }
.auth-card-intro { max-width: 780px; display: grid; grid-template-columns: 1.2fr 1fr; gap: 40px; align-items: center; padding: 28px; }
.auth-intro { display: flex; flex-direction: column; gap: 12px; }
.brand-lg { font-size: 30px; font-weight: 700; letter-spacing: 0.3px; }
.auth-desc { font-size: 14px; line-height: 1.6; color: var(--muted, #9ca3af); margin: 0; }
.auth-desc-dim { font-size: 13px; opacity: 0.7; }
.auth-form { min-width: 0; }
.auth-legal { display: flex; gap: 8px; justify-content: center; margin-top: 18px; font-size: 12px; }
.auth-legal a { color: var(--muted, #9ca3af); text-decoration: none; }
.auth-legal a:hover { color: var(--accent, #60a5fa); }
.auth-title { font-size: 18px; font-weight: 600; margin: 0 0 22px; }
@media (max-width: 720px) {
  .auth-card-intro { grid-template-columns: 1fr; gap: 20px; padding: 20px; }
}

/* modal */
.backdrop { position: fixed; inset: 0; background: rgba(17, 24, 39, 0.32); display: grid; place-items: center; padding: 24px; z-index: 50; }
.modal { background: var(--bg); border-radius: 14px; padding: 22px; width: 100%; max-width: 420px; }
.modal-wide { max-width: 560px; }
.modal-title { font-size: 16px; font-weight: 600; margin: 0 0 4px; }
.modal-sub { color: var(--muted); font-size: 13px; margin: 0 0 18px; }

/* toast */
.toast {
  position: fixed; left: 50%; bottom: 28px; transform: translateX(-50%);
  background: var(--fg); color: #fff; padding: 9px 16px;
  border-radius: 999px; font-size: 13px; z-index: 100;
}

/* mobile */
.tabbar { display: none; }

@media (max-width: 760px) {
  .sidebar { display: none; }
  .main { padding: 20px 16px 92px; }
  .grid-4, .grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .tiers { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .kv { grid-template-columns: 110px 1fr; }
  .tabbar {
    display: flex; position: fixed; left: 0; right: 0; bottom: 0;
    border-top: 1px solid var(--line); background: var(--bg);
    padding: 6px 4px calc(6px + env(safe-area-inset-bottom)); z-index: 40;
  }
  .tabbar a { flex: 1; text-align: center; font-size: 11px; color: var(--muted); padding: 6px 2px; border-radius: 8px; }
  .tabbar a[aria-current="page"] { color: var(--fg); background: var(--soft); }
  .tabbar-lang { display: flex; align-items: center; padding-left: 2px; }
  .tabbar-lang .lang-btn { font-size: 10px; padding: 4px 6px; }
  .hide-sm { display: none; }
}

/* guide (接入指南) */
.guide-body { padding: 20px 24px; }
.guide-h1 { font-size: 1.3em; margin: 0 0 6px; }
.guide-h2 { font-size: 1.12em; margin: 22px 0 8px; }
.guide-h3 { font-size: 1.02em; margin: 16px 0 6px; }
.guide-h4 { font-size: 0.98em; margin: 12px 0 6px; }
.guide-p { margin: 8px 0; line-height: 1.65; }
.guide-p code, .guide-li code, .guide-h1 code, .guide-h2 code, .guide-h3 code, td code {
  background: var(--soft); border-radius: 4px; padding: 1px 5px; font-size: 0.92em;
}
.guide-code {
  display: block; overflow-x: auto; background: var(--soft); border-radius: 8px;
  padding: 12px 14px; margin: 10px 0; font-size: 0.88em; line-height: 1.5;
}
.guide-list { margin: 8px 0 8px 22px; line-height: 1.65; }
.guide-list li { margin: 4px 0; }
.guide-quote {
  margin: 10px 0; padding: 8px 14px; border-left: 3px solid var(--accent, #4f7cff);
  background: var(--soft); border-radius: 0 8px 8px 0; color: var(--dim, inherit);
}
.guide-body table { width: 100%; margin: 10px 0; }
.guide-body blockquote p { margin: 0; }