:root {
  --bg: #f6f7f9;
  --card: #ffffff;
  --fg: #16181d;
  --muted: #6b7280;
  --line: #e3e6ea;
  --accent: #1f6feb;
  --accent-fg: #ffffff;
  --good: #1a7f37;
  --warn: #9a6700;
  --bad: #c1341a;
  --code-bg: #f0f2f5;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1115;
    --card: #171a20;
    --fg: #e7e9ee;
    --muted: #9aa1ac;
    --line: #272b33;
    --accent: #4b8bf5;
    --accent-fg: #0f1115;
    --good: #46c767;
    --warn: #d5a429;
    --bad: #f0836c;
    --code-bg: #0c0e12;
  }
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
        "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  -webkit-text-size-adjust: 100%;
}
.shell { max-width: 30rem; margin: 0 auto; padding: 2rem 1rem 3rem; }

.head h1 { font-size: 1.35rem; margin: 0 0 .25rem; }
.head .sub { margin: 0 0 1.25rem; color: var(--muted); font-size: .95rem; }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 1.25rem;
}

label { display: block; font-weight: 600; font-size: .9rem; margin: 1rem 0 .35rem; }
label:first-of-type { margin-top: 0; }
.opt { font-weight: 400; color: var(--muted); }
input[type="text"], input:not([type]) {
  width: 100%;
}
input {
  width: 100%;
  font: inherit;
  padding: .6rem .7rem;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: var(--bg);
  color: var(--fg);
}
input:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }
#vcode { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; letter-spacing: .06em; }

button {
  font: inherit;
  font-weight: 600;
  padding: .65rem 1rem;
  border-radius: 9px;
  border: 1px solid transparent;
  cursor: pointer;
}
button.primary { background: var(--accent); color: var(--accent-fg); width: 100%; margin-top: 1.1rem; }
button.ghost { background: transparent; color: var(--fg); border-color: var(--line); width: 100%; margin-top: 1.1rem; }
button:disabled { opacity: .55; cursor: default; }
.row { display: flex; gap: .6rem; }
.row button { margin-top: 1.1rem; }

.note, .hint { color: var(--muted); font-size: .85rem; margin: .75rem 0 0; }
.hint { margin-top: .45rem; }
.check { display: flex; align-items: center; gap: .5rem; font-weight: 400; font-size: .9rem; }
.check input { width: auto; }

.label { color: var(--muted); font-size: .85rem; margin: 0; }
.code {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: clamp(1.4rem, 7vw, 1.9rem);
  font-weight: 600;
  letter-spacing: .08em;
  background: var(--code-bg);
  border-radius: 10px;
  padding: .8rem .5rem;
  margin: .5rem 0 0;
  text-align: center;
  overflow-wrap: anywhere;
}

.kv { margin: 1.1rem 0 0; display: grid; grid-template-columns: auto 1fr; gap: .4rem .9rem; font-size: .95rem; }
.kv dt { color: var(--muted); }
.kv dd { margin: 0; overflow-wrap: anywhere; }
.kv dd.ok { color: var(--good); font-weight: 600; }
.kv dd.no { color: var(--bad); font-weight: 600; }

.verdict { font-size: 1.2rem; font-weight: 700; margin: 0; }
.verdict.good { color: var(--good); }
.verdict.warn { color: var(--warn); }
.verdict.bad { color: var(--bad); }

.status-line { margin: 0 0 .25rem; font-size: .95rem; }
.switch { margin: 1.1rem 0 0; font-size: .9rem; }
.switch a { color: var(--accent); text-decoration: none; }
.switch a:hover { text-decoration: underline; }
.switch a.danger { color: var(--bad); }
.dot { color: var(--muted); margin: 0 .4rem; }

.err, .err-body { color: var(--bad); font-size: .9rem; margin: .9rem 0 0; }
.busy { display: flex; align-items: center; gap: .6rem; margin: 0; color: var(--muted); }
.spinner {
  width: 1rem; height: 1rem; flex: none;
  border: 2px solid var(--line); border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin .7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce) { .spinner { animation: none; } }

.about { margin: 1.25rem 0 0; color: var(--muted); font-size: .85rem; }
.about summary { cursor: pointer; }
.about ul { margin: .6rem 0 0; padding-left: 1.2rem; }
.about li { margin: .3rem 0; }
.about strong { color: var(--fg); }

.warnbox {
  background: var(--code-bg);
  border-left: 3px solid var(--warn);
  border-radius: 0 8px 8px 0;
  padding: .6rem .7rem;
  margin: .9rem 0 0;
}
.badge {
  display: inline-block;
  font-size: .75rem;
  font-weight: 600;
  padding: .1rem .45rem;
  border-radius: 6px;
  margin-left: .4rem;
  background: var(--code-bg);
  color: var(--muted);
}
.badge.no { color: var(--warn); }
.copied { background: var(--good) !important; border-color: var(--good) !important; color: #fff !important; }