:root {
  --bg: #fbfbfa; --surface: #ffffff; --text: #16181d; --muted: #5b6270; --line: #e3e5e9;
  --accent: #1d4ed8; --accent-soft: #e8eefc; --ok: #166534; --ok-soft: #e7f5ec; --bad: #9f1d1d; --bad-soft: #fbeaea;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0f1115; --surface: #161a21; --text: #e7e9ee; --muted: #9aa3b2; --line: #262c36;
    --accent: #7aa2ff; --accent-soft: #1b2540; --ok: #7bd49a; --ok-soft: #15261c; --bad: #f19a9a; --bad-soft: #2c1717;
  }
}
:root[data-theme="dark"] {
  --bg: #0f1115; --surface: #161a21; --text: #e7e9ee; --muted: #9aa3b2; --line: #262c36;
  --accent: #7aa2ff; --accent-soft: #1b2540; --ok: #7bd49a; --ok-soft: #15261c; --bad: #f19a9a; --bad-soft: #2c1717;
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text);
  font: 16px/1.6 "Inter", "Segoe UI", system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", Arial, sans-serif; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { max-width: 900px; margin: 0 auto; padding: 0 16px; }
header.top { border-bottom: 1px solid var(--line); background: var(--surface); }
header.top .wrap { display: flex; align-items: center; justify-content: space-between; height: 56px; }
.brand { font-weight: 700; font-size: 18px; color: var(--text); }
.brand span { color: var(--accent); }
.brand:hover { text-decoration: none; }
nav a { color: var(--muted); margin-left: 18px; font-size: 14px; }
.hero { padding: 48px 0 20px; }
.eyebrow { color: var(--accent); font-weight: 600; font-size: 13px; letter-spacing: .08em; text-transform: uppercase; }
h1 { font-size: clamp(30px, 5vw, 44px); line-height: 1.1; letter-spacing: -.02em; margin: 10px 0 14px; }
.lede { color: var(--muted); font-size: 17px; margin: 0 0 8px; max-width: 64ch; }
h2 { font-size: 21px; margin: 0 0 14px; }
h2 small, label small { color: var(--muted); font-weight: 400; font-size: .8em; margin-left: 4px; }
.panel { background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 22px; margin: 18px 0; }
.muted { color: var(--muted); margin: 0 0 14px; font-size: 15px; }
.topics { display: grid; gap: 10px; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); margin-bottom: 16px; }
.topic { display: flex; gap: 10px; align-items: flex-start; border: 1px solid var(--line); border-radius: 10px; padding: 12px; cursor: pointer; }
.topic:has(input:checked) { border-color: var(--accent); background: var(--accent-soft); }
.topic input { margin-top: 5px; width: 18px; height: 18px; accent-color: var(--accent); flex: none; }
.topic b, .topic small, .topic code { display: block; }
.topic small { color: var(--muted); font-size: 13px; font-weight: 400; margin: 2px 0 0; }
.topic code { color: var(--muted); font-size: 12px; font-weight: 400; margin-top: 4px; overflow-wrap: anywhere; }
.row { display: grid; gap: 12px; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
label { display: block; font-size: 14px; font-weight: 600; }
input[type=email], input[type=text], input[type=password], select {
  display: block; width: 100%; margin-top: 6px; padding: 10px 12px; font: inherit; color: var(--text);
  background: var(--bg); border: 1px solid var(--line); border-radius: 8px; }
input:focus, select:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
.hp { position: absolute; left: -9999px; }
.actions { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; margin-top: 16px; }
.hint { color: var(--muted); font-size: 13px; }
.btn { padding: 10px 18px; border-radius: 8px; font: 600 15px/1.2 inherit; border: 1px solid var(--line); color: var(--text); background: var(--surface); cursor: pointer; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.danger { color: var(--bad); border-color: var(--bad); }
.btn:disabled { opacity: .6; cursor: default; }
.flash { border-radius: 10px; padding: 12px 16px; background: var(--ok-soft); color: var(--ok); border: 1px solid var(--ok); margin: 12px 0; }
.flash.bad { background: var(--bad-soft); color: var(--bad); border-color: var(--bad); }
ul.plain { padding-left: 18px; margin: 0; }
ul.plain li { margin: 8px 0; color: var(--muted); }
ul.plain li strong { color: var(--text); }
.opt { display: flex; gap: 10px; align-items: flex-start; font-weight: 400; margin: 10px 0; }
.opt input { margin-top: 4px; width: 18px; height: 18px; accent-color: var(--accent); flex: none; }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { text-align: left; padding: 8px 6px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: .05em; }
.tablewrap { overflow-x: auto; }
.pill { display: inline-block; font-size: 12px; border-radius: 999px; padding: 1px 8px; margin: 1px 2px 1px 0; background: var(--accent-soft); color: var(--accent); }
.pill.warn { background: var(--bad-soft); color: var(--bad); }
.stats { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 14px; }
.stat { border: 1px solid var(--line); border-radius: 10px; padding: 8px 14px; font-size: 14px; }
.stat b { font-size: 20px; display: block; }
footer { border-top: 1px solid var(--line); padding: 24px 0 40px; color: var(--muted); font-size: 14px; margin-top: 30px; }
footer .wrap { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; }