:root {
  color-scheme: light dark;
  --fg: #1d1d1f; --bg: #fafafa; --muted: #55585e; --line: #c9c9cf;
  --accent: #2448b8; --on-accent: #ffffff; --error: #a8221b;
  font-family: system-ui, -apple-system, "Segoe UI", "Noto Sans TC", "PingFang TC", sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root { --fg: #f2f2f3; --bg: #121214; --muted: #b0b3ba; --line: #3a3a41; --accent: #9db8ff; --on-accent: #121214; --error: #f4b6b2; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg); line-height: 1.5; }
.top, .card { max-width: 480px; margin: 0 auto; padding: 16px; }
.top { display: flex; justify-content: space-between; align-items: center; }
.brand { font-weight: 600; letter-spacing: .02em; }
h1 { font-size: 1.5rem; margin: .5rem 0 1rem; }
label { display: block; font-weight: 500; margin: 1rem 0 .25rem; }
input[type=email], input[type=text] { width: 100%; padding: .7rem .8rem; font-size: 1rem; color: inherit; background: transparent; border: 1px solid var(--line); border-radius: 8px; }
input:focus-visible, button:focus-visible, a:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }
button { width: 100%; margin-top: 1rem; padding: .7rem 1rem; font-size: 1rem; color: var(--on-accent); background: var(--accent); border: 0; border-radius: 8px; cursor: pointer; }
.lang button { width: auto; margin: 0; padding: .25rem .5rem; color: var(--accent); background: transparent; }
.error { color: var(--error); }
.note, .terms { color: var(--muted); font-size: .9rem; }
a { color: var(--accent); }
.cf-turnstile { margin-top: 1rem; min-height: 65px; }
button.secondary { color: var(--accent); background: transparent; border: 1px solid var(--accent); }
.or { text-align: center; color: var(--muted); margin: 1rem 0 0; }
h2 { font-size: 1.1rem; margin: 2rem 0 .5rem; }
select { width: 100%; padding: .6rem .8rem; font-size: 1rem; color: inherit; background: transparent; border: 1px solid var(--line); border-radius: 8px; }
.list { list-style: none; padding: 0; }
.list li { padding: .75rem 0; border-bottom: 1px solid var(--line); }
form.inline button { width: auto; margin-top: .5rem; padding: .3rem .8rem; }
.notice { color: var(--accent); }
button.danger { background: var(--error); color: var(--bg); }
.legal ul { padding-left: 1.25rem; }
.legal li { margin: .4rem 0; }
body.admin .top, body.admin .card, body.admin .admin-nav { max-width: 960px; }
.admin-nav { margin: 0 auto; padding: 0 16px; display: flex; flex-wrap: wrap; gap: .25rem 1rem; align-items: center; }
.admin-nav form.inline button { margin-top: 0; }
table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: .4rem .5rem; border-bottom: 1px solid var(--line); vertical-align: top; }
input[type=password], textarea { width: 100%; padding: .7rem .8rem; font-size: 1rem; color: inherit; background: transparent; border: 1px solid var(--line); border-radius: 8px; }