:root {
  --bg: #0f1216;
  --card: #171b21;
  --line: #262c34;
  --fg: #e6e9ee;
  --muted: #98a2b3;
  --accent: #4d9cf7;
  --accent-2: #2f7de1;
  --ok: #35c48a;
  --err: #f2635f;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f4f6f9;
    --card: #ffffff;
    --line: #e2e6ec;
    --fg: #1a1f27;
    --muted: #5c6675;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 15px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

.wrap { max-width: 860px; margin: 0 auto; padding: 40px 20px 64px; }

.head h1 { margin: 0 0 8px; font-size: 26px; letter-spacing: .3px; }
.sub { margin: 0 0 24px; color: var(--muted); font-size: 14px; }
.sub b { color: var(--fg); }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 22px;
}

.field { display: block; margin-bottom: 16px; }
.label { display: block; margin-bottom: 6px; font-size: 13px; color: var(--muted); }
.label em { font-style: normal; opacity: .7; }
.label code, .hint code { background: rgba(127,127,127,.16); padding: 1px 5px; border-radius: 4px; font-size: 12px; }

input[type="text"], textarea, select {
  width: 100%;
  padding: 10px 12px;
  background: var(--bg);
  color: var(--fg);
  border: 1px solid var(--line);
  border-radius: 9px;
  font: inherit;
  font-size: 14px;
  outline: none;
}
input[type="text"]:focus, textarea:focus, select:focus { border-color: var(--accent); }
textarea { resize: vertical; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 13px; }
select:disabled { opacity: .5; }

.grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0 16px; }
@media (max-width: 640px) { .grid { grid-template-columns: 1fr; } }

.adv { margin: 4px 0 18px; border-top: 1px dashed var(--line); padding-top: 14px; }
.adv summary { cursor: pointer; color: var(--muted); font-size: 13px; margin-bottom: 12px; }
.check { display: flex; align-items: center; gap: 8px; font-size: 14px; color: var(--muted); }

.actions { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 4px; }

button, .btn {
  padding: 10px 18px;
  border-radius: 9px;
  border: 1px solid var(--line);
  background: var(--bg);
  color: var(--fg);
  font: inherit;
  font-size: 14px;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
}
button.primary { background: var(--accent-2); border-color: var(--accent-2); color: #fff; font-weight: 600; }
button.primary:hover { background: var(--accent); }
button.ghost:hover, .btn:hover { border-color: var(--accent); }
button[disabled] { opacity: .6; cursor: default; }

.msg { margin-top: 16px; padding: 10px 12px; border-radius: 9px; font-size: 14px; border: 1px solid var(--line); }
.msg.err { border-color: var(--err); color: var(--err); }
.msg.ok { border-color: var(--ok); color: var(--ok); }

.result { margin-top: 22px; border-top: 1px solid var(--line); padding-top: 18px; }
.result input { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 13px; margin-bottom: 10px; }
.hint { color: var(--muted); font-size: 12.5px; margin: 12px 0 0; }

.foot { display: flex; justify-content: space-between; color: var(--muted); font-size: 12.5px; margin-top: 20px; }