:root {
  color-scheme: light dark;
  --bg: #f6f7fb;
  --card: #ffffff;
  --ink: #12162b;
  --ink-2: #4a5068;
  --muted: #6b7189;
  --line: #e3e6ef;
  --brand: #142572;
  --accent: #3b63d6;
  --ok: #1f8a4c;
  --warn: #9a6200;
  --bad: #b42318;
  --field: #ffffff;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1020;
    --card: #151a2e;
    --ink: #eef0f7;
    --ink-2: #c3c7d6;
    --muted: #9095ab;
    --line: #262c45;
    --brand: #a9bbf3;
    --accent: #7d9cf0;
    --ok: #58c487;
    --warn: #f0b84a;
    --bad: #f07a6e;
    --field: #0f1325;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, "PingFang TC", "Noto Sans TC", sans-serif;
}
header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 760px;
  margin: 0 auto;
  padding: 20px 20px 8px;
}
.brand { font-weight: 700; font-size: 18px; color: var(--brand); text-decoration: none; letter-spacing: -0.01em; }
.brand span { color: var(--accent); }
nav { display: flex; align-items: center; gap: 14px; font-size: 14px; }
nav form { margin: 0; }
main { max-width: 760px; margin: 0 auto; padding: 8px 20px 40px; }
footer { text-align: center; color: var(--muted); font-size: 13px; padding: 20px 20px 96px; }
a { color: var(--accent); }
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 24px;
  margin: 16px 0;
}
h1 { font-size: 24px; margin: 0 0 12px; letter-spacing: -0.01em; }
h2 { font-size: 18px; margin: 0 0 8px; }
p { margin: 10px 0; }
.muted { color: var(--muted); font-size: 14px; }
.error, .warn { color: var(--bad); }
.notice { background: var(--card); border: 1px solid var(--line); border-left: 4px solid var(--ok); border-radius: 12px; padding: 12px 16px; }
.warnbox { border: 1px solid var(--bad); border-radius: 12px; padding: 12px 16px; margin: 12px 0; color: var(--ink); }
.warnbox ul { margin: 6px 0; }
label { display: block; margin: 14px 0; font-weight: 600; font-size: 14px; }
label small { display: block; font-weight: 400; color: var(--muted); margin-top: 4px; }
input {
  display: block;
  width: 100%;
  margin-top: 6px;
  padding: 11px 12px;
  font: inherit;
  color: var(--ink);
  background: var(--field);
  border: 1px solid var(--line);
  border-radius: 10px;
}
input:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
button, .button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 18px;
  font: 600 15px/1.2 inherit;
  font-family: inherit;
  color: #fff;
  background: var(--brand);
  border: 1px solid transparent;
  border-radius: 10px;
  cursor: pointer;
  text-decoration: none;
}
@media (prefers-color-scheme: dark) { button, .button { color: #0d1020; } }
button.secondary, .button.secondary { background: transparent; color: var(--ink); border-color: var(--line); }
button.danger { background: transparent; color: var(--bad); border-color: var(--bad); }
button.link { background: none; border: 0; padding: 0; color: var(--accent); font-weight: 500; font-size: 14px; }
button.small, .button.small { padding: 6px 12px; font-size: 13px; }
button:focus-visible, .button:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.row { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.row form { margin: 0; }
.actions { display: flex; gap: 10px; flex-wrap: wrap; }
.list { list-style: none; padding: 0; margin: 8px 0 0; }
.list li { display: grid; gap: 8px; padding: 14px 0; border-top: 1px solid var(--line); }
.list li:first-child { border-top: 0; }
.pill { display: inline-block; font-size: 12px; font-weight: 600; padding: 2px 9px; border-radius: 999px; border: 1px solid var(--line); color: var(--ink-2); }
.pill.ok { color: var(--ok); border-color: var(--ok); }
.pill.bad { color: var(--bad); border-color: var(--bad); }
.pill.warn { color: var(--warn); border-color: var(--warn); text-decoration: none; }
.frame { border: 1px solid var(--line); border-radius: 12px; overflow: hidden; background: #fff; aspect-ratio: 16 / 10; }
.frame iframe { width: 100%; height: 100%; border: 0; display: block; }
ul { padding-left: 20px; }