:root {
  --bg: #f6f7fb;
  --card: #ffffff;
  --text: #111827;
  --muted: #6b7280;
  --border: #e5e7eb;
  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --primary-soft: #eef2ff;
  --ok: #059669;
  --ok-soft: #ecfdf5;
  --warn: #b45309;
  --warn-soft: #fffbeb;
  --err: #dc2626;
  --err-soft: #fef2f2;
  --radius: 14px;
  color-scheme: light;
}
html.dark {
  --bg: #0b1020;
  --card: #141a2e;
  --text: #e5e7eb;
  --muted: #9ca3af;
  --border: #263049;
  --primary: #818cf8;
  --primary-hover: #a5b4fc;
  --primary-soft: #1e2547;
  --ok: #34d399;
  --ok-soft: #0f2a24;
  --warn: #fbbf24;
  --warn-soft: #2a2213;
  --err: #f87171;
  --err-soft: #2d1618;
  color-scheme: dark;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font: 15px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
}
.wrap { max-width: 600px; margin: 0 auto; padding: 20px 16px 40px; }
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  margin-bottom: 16px;
}
.center { text-align: center; }
h1 { font-size: 20px; margin: 0 0 4px; display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
h2 { font-size: 15px; margin: 0 0 12px; }
.sub { color: var(--muted); font-size: 13px; margin: 0; }
.badge {
  display: inline-block; font-size: 12px; line-height: 1; padding: 5px 8px; border-radius: 999px;
  background: var(--primary-soft); color: var(--primary); font-weight: 600; vertical-align: middle;
}
.badge.test { background: var(--warn-soft); color: var(--warn); }
.badge.ok { background: var(--ok-soft); color: var(--ok); }
.badge.err { background: var(--err-soft); color: var(--err); }
.badge.warn { background: var(--warn-soft); color: var(--warn); }
.row { display: flex; justify-content: space-between; align-items: center; gap: 12px; }
.account { margin-top: 16px; padding: 12px 14px; border-radius: 10px; background: var(--primary-soft); }
.account b { word-break: break-all; }
.label { color: var(--muted); font-size: 13px; }
.presets { display: grid; grid-template-columns: repeat(auto-fill, minmax(90px, 1fr)); gap: 10px; }
.preset {
  border: 1.5px solid var(--border); background: var(--card); color: var(--text);
  border-radius: 10px; padding: 12px 6px; font-size: 16px; font-weight: 600; cursor: pointer;
  transition: border-color .15s, background .15s;
}
.preset:hover { border-color: var(--primary); }
.preset.active { border-color: var(--primary); background: var(--primary-soft); color: var(--primary); }
.custom { margin-top: 12px; display: flex; align-items: center; gap: 8px; }
.custom input {
  flex: 1; min-width: 0; font-size: 16px; padding: 10px 12px; border-radius: 10px;
  border: 1.5px solid var(--border); background: var(--card); color: var(--text); outline: none;
}
.custom input:focus { border-color: var(--primary); }
.summary { margin-top: 16px; padding: 14px; border-radius: 10px; border: 1px dashed var(--border); }
.summary .big { font-size: 22px; font-weight: 700; }
.btn {
  display: block; width: 100%; margin-top: 16px; padding: 13px 16px; border: 0; border-radius: 10px;
  background: var(--primary); color: #fff; font-size: 16px; font-weight: 600; cursor: pointer; text-align: center;
  text-decoration: none;
}
html.dark .btn { color: #0b1020; }
.btn:hover { background: var(--primary-hover); }
.btn[disabled] { opacity: .55; cursor: not-allowed; }
.btn.secondary { background: transparent; color: var(--primary); border: 1.5px solid var(--primary); }
.msg { margin-top: 12px; padding: 10px 12px; border-radius: 10px; font-size: 14px; }
.msg.err { background: var(--err-soft); color: var(--err); }
.msg.ok { background: var(--ok-soft); color: var(--ok); }
.msg.warn { background: var(--warn-soft); color: var(--warn); }
.notes { margin: 0; padding-left: 18px; color: var(--muted); font-size: 13px; }
.notes li { margin: 4px 0; }
.orders { width: 100%; border-collapse: collapse; font-size: 13px; }
.orders td { padding: 8px 4px; border-top: 1px solid var(--border); vertical-align: middle; }
.orders td:last-child { text-align: right; }
.orders a { color: var(--primary); }
.mono { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 12px; word-break: break-all; }
.status-icon { font-size: 44px; line-height: 1; margin-bottom: 8px; }
.spinner {
  width: 28px; height: 28px; margin: 18px auto; border-radius: 50%;
  border: 3px solid var(--border); border-top-color: var(--primary); animation: spin .8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.footer { text-align: center; color: var(--muted); font-size: 12px; }
.hidden { display: none !important; }
.tr { text-align: right; }
.mt8 { margin-top: 8px; }
.mt12 { margin-top: 12px; }
.arrow { font-size: 20px; color: var(--muted); }
.explain {
  margin-top: 14px; padding: 12px 14px; border-radius: 10px;
  background: var(--primary-soft); border-left: 4px solid var(--primary); font-size: 13.5px;
}
.explain-title { font-weight: 700; margin-bottom: 6px; color: var(--primary); }
.explain ul { margin: 0; padding-left: 18px; }
.explain li { margin: 4px 0; }
.formula { margin: 6px 0 2px; font-weight: 700; font-size: 14.5px; }
.footer a { color: var(--primary); }