:root {
  --bg: #f6f7fb;
  --card: #fff;
  --text: #2d3142;
  --muted: #8a8fa3;
  --primary: #5b8def;
  --line: #e6e8f0;
  --yes: #3aa76d;
  --no: #e0736a;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.6 -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 640px;
  margin: 0 auto;
  padding: 16px;
}
header h1 { font-size: 20px; margin: 0; }

a { color: var(--primary); text-decoration: none; }

main { max-width: 640px; margin: 0 auto; padding: 0 16px 40px; }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 16px;
  margin-bottom: 12px;
}

#lobby { display: flex; flex-direction: column; gap: 12px; }
#lobby label { display: flex; flex-direction: column; gap: 6px; }

input {
  flex: 1;
  min-width: 0;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  font: inherit;
  outline: none;
}
input:focus { border-color: var(--primary); }

button {
  padding: 10px 18px;
  border: none;
  border-radius: 8px;
  background: var(--primary);
  color: #fff;
  font: inherit;
  cursor: pointer;
}
button:hover { opacity: 0.9; }
button.ghost { background: none; color: var(--muted); border: 1px solid var(--line); padding: 6px 12px; }

.row { display: flex; gap: 8px; }
.divider, .hint { text-align: center; color: var(--muted); font-size: 13px; margin: 0; }
.code { letter-spacing: 2px; color: var(--primary); }

.top { display: flex; justify-content: space-between; align-items: center; gap: 8px; flex-wrap: wrap; }
.vs { color: var(--muted); margin: 0 6px; font-size: 12px; }
.info { color: var(--muted); font-size: 13px; margin: 0 4px 12px; min-height: 1em; }
.info b { color: var(--text); }

.action p { margin: 0 0 12px; }
.action p:last-child { margin-bottom: 0; }
.loading { color: var(--muted); }
.result { font-size: 22px; font-weight: bold; }
.result.win { color: var(--yes); }
.result.lose { color: var(--no); }

.history:empty { display: none; }
.history h3 { margin: 0 0 8px; font-size: 15px; }
.round { border-top: 1px solid var(--line); padding: 10px 0; }
.round-title { font-weight: bold; font-size: 13px; color: var(--muted); }
.qa, .take { font-size: 14px; }
.ans { display: inline-block; padding: 0 8px; margin-left: 4px; border-radius: 10px; font-size: 12px; color: #fff; }
.ans-yes { background: var(--yes); }
.ans-no { background: var(--no); }
.ans-bad { background: var(--muted); }

#toast {
  position: fixed;
  left: 50%;
  bottom: 32px;
  transform: translateX(-50%);
  background: rgba(45, 49, 66, 0.9);
  color: #fff;
  padding: 8px 16px;
  border-radius: 8px;
}

/* 教程页 */
.tutorial h2 { font-size: 17px; margin: 0 0 8px; }
.tutorial p, .tutorial li { margin: 4px 0; }
.tutorial .example { background: var(--bg); border-radius: 8px; padding: 10px 12px; font-size: 14px; }