:root {
  --bg: #f6f5f2;
  --card: #ffffff;
  --ink: #14161c;
  --muted: #5d6170;
  --line: #e3e1db;
  --accent: #0e131f;
  --accent-ink: #ffffff;
  --soft: #eef0f4;
  --warn: #9a3b12;
  --warn-bg: #fff3ea;
  --radius: 14px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, "Noto Sans TC", sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1116;
    --card: #181b22;
    --ink: #eceef3;
    --muted: #a0a5b4;
    --line: #2a2e38;
    --accent: #eceef3;
    --accent-ink: #0f1116;
    --soft: #222632;
    --warn: #ffb48a;
    --warn-bg: #2b1d15;
  }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink); line-height: 1.55; font-size: 16px; }
a { color: inherit; }
.wrap { max-width: 880px; margin: 0 auto; padding: 0 20px; }
header.top { border-bottom: 1px solid var(--line); background: var(--card); }
header.top .wrap { display: flex; align-items: center; justify-content: space-between; height: 64px; gap: 12px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; text-decoration: none; letter-spacing: .01em; }
.brand img { width: 30px; height: 30px; border-radius: 8px; }
.who { display: flex; align-items: center; gap: 10px; font-size: 14px; color: var(--muted); }
.who img { width: 28px; height: 28px; border-radius: 50%; }
h1 { font-size: 30px; line-height: 1.2; margin: 40px 0 10px; letter-spacing: -.01em; }
h2 { font-size: 19px; margin: 0 0 4px; }
p.lead { color: var(--muted); max-width: 640px; margin: 0 0 28px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; margin-bottom: 18px; }
.hint { color: var(--muted); font-size: 14px; margin: 0 0 14px; }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; border: 0; border-radius: 999px; padding: 11px 20px; font: inherit; font-weight: 600; cursor: pointer; text-decoration: none; background: var(--accent); color: var(--accent-ink); min-height: 44px; }
.btn.secondary { background: var(--soft); color: var(--ink); }
.btn.small { padding: 6px 14px; min-height: 34px; font-size: 14px; }
.btn:disabled { opacity: .5; cursor: progress; }
form.row { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
input[type=text] { flex: 1 1 260px; min-width: 0; font: inherit; padding: 11px 14px; border: 1px solid var(--line); border-radius: 10px; background: var(--bg); color: var(--ink); min-height: 44px; }
select { font: inherit; padding: 10px 12px; border: 1px solid var(--line); border-radius: 10px; background: var(--bg); color: var(--ink); min-height: 44px; }
label.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
.results { margin-top: 18px; display: grid; gap: 12px; }
.post { border: 1px solid var(--line); border-radius: 12px; padding: 14px 16px; background: var(--bg); }
.post .meta { display: flex; flex-wrap: wrap; gap: 8px 14px; font-size: 13px; color: var(--muted); margin-bottom: 6px; }
.post .meta b { color: var(--ink); }
.post .text { white-space: pre-wrap; word-break: break-word; }
.post .actions { margin-top: 10px; display: flex; gap: 8px; flex-wrap: wrap; }
.status { font-size: 14px; color: var(--muted); margin-top: 14px; }
.error { color: var(--warn); background: var(--warn-bg); padding: 10px 14px; border-radius: 10px; font-size: 14px; margin-top: 14px; }
.profile { display: flex; gap: 16px; align-items: flex-start; margin-top: 18px; }
.profile img { width: 64px; height: 64px; border-radius: 50%; flex: none; background: var(--soft); }
.stats { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px; }
.stat { background: var(--soft); border-radius: 999px; padding: 4px 12px; font-size: 13px; }
.steps { margin: 0; padding-left: 20px; color: var(--muted); }
.steps li { margin: 4px 0; }
footer { color: var(--muted); font-size: 14px; padding: 30px 0 50px; }
footer a { margin-right: 16px; }
.doc h1 { margin-top: 36px; }
.doc h2 { margin-top: 28px; }
.doc p, .doc li { max-width: 700px; }
[hidden] { display: none !important; }
@media (max-width: 560px) {
  h1 { font-size: 25px; }
  .card { padding: 18px; }
  header.top .brand span { display: none; }
}