:root {
  --bg: #f7f7f9;
  --surface: #ffffff;
  --text: #1c1d22;
  --muted: #6b6f7b;
  --border: #e3e4e9;
  --accent: #4b47d6;
  --accent-ink: #ffffff;
  --accent-soft: #ecebfd;
  --ok-bg: #e9f7ef;
  --ok-border: #a9dcbc;
  --ok-text: #14532d;
  --err-bg: #fdecec;
  --err-border: #f1b5b5;
  --err-text: #8a1c1c;
  --radius: 12px;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15161a;
    --surface: #1e1f25;
    --text: #e9eaee;
    --muted: #9a9eab;
    --border: #2f3139;
    --accent: #8d89ff;
    --accent-ink: #15161a;
    --accent-soft: #26254a;
    --ok-bg: #12291c;
    --ok-border: #2f6b47;
    --ok-text: #b8ebcb;
    --err-bg: #2c1717;
    --err-border: #6b2f2f;
    --err-text: #f3c0c0;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", "PingFang SC", "Microsoft YaHei", sans-serif;
}
a { color: var(--accent); }
header.top {
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}
header.top .in, main, footer .in { max-width: 760px; margin: 0 auto; padding: 0 20px; }
header.top .in { display: flex; align-items: center; gap: 10px; height: 56px; }
header.top a.brand { display: flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; font-weight: 650; }
header.top img { width: 26px; height: 26px; border-radius: 6px; }
main { padding-top: 36px; padding-bottom: 48px; }
h1 { font-size: 1.75rem; line-height: 1.25; margin: 0 0 12px; letter-spacing: -0.01em; }
h2 { font-size: 1.2rem; margin: 32px 0 8px; }
h3 { font-size: 1rem; margin: 20px 0 6px; }
p, li { color: var(--text); }
.lead { font-size: 1.1rem; color: var(--muted); margin-top: 0; }
.muted { color: var(--muted); }
.small { font-size: 0.9rem; }
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  margin: 20px 0;
}
.card.narrow { max-width: 460px; }
.notice { border-radius: var(--radius); padding: 14px 16px; margin: 16px 0; border: 1px solid; }
.notice.ok { background: var(--ok-bg); border-color: var(--ok-border); color: var(--ok-text); }
.notice.err { background: var(--err-bg); border-color: var(--err-border); color: var(--err-text); }
.icon-big { font-size: 40px; line-height: 1; margin-bottom: 12px; }
label { display: block; font-weight: 600; font-size: 0.95rem; margin: 14px 0 6px; }
input[type=password], input[type=email], input[type=text] {
  width: 100%;
  font: inherit;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
}
input:focus { outline: 2px solid var(--accent); outline-offset: 1px; border-color: transparent; }
button {
  font: inherit;
  font-weight: 600;
  margin-top: 18px;
  width: 100%;
  padding: 11px 16px;
  border: 0;
  border-radius: 8px;
  background: var(--accent);
  color: var(--accent-ink);
  cursor: pointer;
}
button:disabled { opacity: 0.6; cursor: default; }
ol.steps { padding-left: 1.3em; }
ol.steps li { margin: 6px 0; }
.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 14px; margin: 24px 0; }
.features .card { margin: 0; padding: 18px; }
.features h3 { margin-top: 0; }
.features p { margin: 0; color: var(--muted); font-size: 0.95rem; }
.legal h2 { border-top: 1px solid var(--border); padding-top: 24px; }
.legal ul { padding-left: 1.3em; }
footer { border-top: 1px solid var(--border); padding: 20px 0 32px; }
footer .in { display: flex; flex-wrap: wrap; gap: 6px 18px; color: var(--muted); font-size: 0.9rem; }
footer a { color: var(--muted); }
[hidden] { display: none !important; }