:root {
  color-scheme: light;
  --bg: #f4f3f8; --panel: #fff; --ink: #1b1a22; --muted: #6c6a78; --line: #e3e1ea;
  --brand: #5b3fd1; --brand-ink: #fff; --up: #1e7f4f; --down: #b3261e; --note: #fff4d6; --note-ink: #6a4b00;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --bg: #131218; --panel: #1c1b23; --ink: #ecebf2; --muted: #a29fb0; --line: #2d2b36;
    --brand: #8f7bff; --brand-ink: #120f22; --up: #5fd39a; --down: #ff8a80; --note: #3a3016; --note-ink: #f3dc9b;
  }
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #131218; --panel: #1c1b23; --ink: #ecebf2; --muted: #a29fb0; --line: #2d2b36;
  --brand: #8f7bff; --brand-ink: #120f22; --up: #5fd39a; --down: #ff8a80; --note: #3a3016; --note-ink: #f3dc9b;
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 15px/1.5 -apple-system, "Segoe UI", Roboto, Arial, sans-serif; }
a { color: var(--brand); }
.note { background: var(--note); color: var(--note-ink); text-align: center; font-size: 13px; padding: 6px 12px; }
header { background: var(--panel); border-bottom: 1px solid var(--line); }
header .in { max-width: 1040px; margin: 0 auto; padding: 10px 16px; display: flex; align-items: center; gap: 18px; flex-wrap: wrap; }
.logo { font-weight: 800; font-size: 18px; color: var(--ink); text-decoration: none; display: flex; align-items: center; gap: 8px; }
.logo i { width: 26px; height: 26px; border-radius: 8px; background: var(--brand); display: inline-block; }
nav { display: flex; gap: 4px; flex-wrap: wrap; flex: 1; }
nav a { color: var(--muted); text-decoration: none; padding: 6px 10px; border-radius: 8px; }
nav a.on { color: var(--ink); background: var(--bg); font-weight: 600; }
.who { color: var(--muted); font-size: 13px; display: flex; gap: 8px; align-items: center; }
main { max-width: 1040px; margin: 0 auto; padding: 20px 16px 60px; }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: 14px; padding: 18px; margin-bottom: 16px; }
.big { font-size: 30px; font-weight: 700; font-variant-numeric: tabular-nums; }
.muted { color: var(--muted); }
.up { color: var(--up); } .down { color: var(--down); }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 10px; margin-top: 12px; }
.grid div b { display: block; font-variant-numeric: tabular-nums; }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { text-align: left; padding: 8px 6px; border-bottom: 1px solid var(--line); }
td.n, th.n { text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; }
.scroll { overflow-x: auto; }
.btn { background: var(--brand); color: var(--brand-ink); border: 0; border-radius: 10px; padding: 10px 16px; font: inherit; font-weight: 600; cursor: pointer; text-decoration: none; display: inline-block; }
.ghost { background: transparent; border: 1px solid var(--line); color: var(--ink); border-radius: 8px; padding: 5px 10px; font: inherit; cursor: pointer; }
input[type=text] { padding: 10px 12px; border-radius: 10px; border: 1px solid var(--line); background: var(--bg); color: var(--ink); font: inherit; }
code, pre { font-family: ui-monospace, Menlo, monospace; font-size: 13px; }
pre { background: var(--bg); border: 1px solid var(--line); border-radius: 10px; padding: 12px; overflow-x: auto; }
.token { word-break: break-all; background: var(--bg); border: 1px dashed var(--brand); border-radius: 10px; padding: 12px; font-family: ui-monospace, Menlo, monospace; }
.tabs { display: flex; gap: 6px; margin-bottom: 12px; flex-wrap: wrap; }
.tabs a { padding: 6px 12px; border-radius: 999px; border: 1px solid var(--line); text-decoration: none; color: var(--ink); }
.tabs a.on { background: var(--brand); color: var(--brand-ink); border-color: var(--brand); }
.hero { max-width: 560px; margin: 10vh auto 0; }
.hero h1 { font-size: 30px; margin: 0 0 12px; }
.err { color: var(--down); }
.gbtn { display: inline-flex; align-items: center; gap: 10px; background: var(--panel); color: var(--ink); border: 1px solid var(--line); border-radius: 10px; padding: 12px 20px; font-weight: 600; text-decoration: none; }
.gbtn b { color: #4285f4; }

/* theme switch */
.theme-toggle { font-size: 13px; white-space: nowrap; }
.theme-toggle.floating { position: fixed; right: 12px; bottom: 12px; z-index: 50; background: var(--panel); color: var(--ink);
  border: 1px solid var(--line); border-radius: 999px; padding: 6px 12px; cursor: pointer; box-shadow: 0 1px 4px rgba(0,0,0,.08); }