:root {
  --bg: #f7f4ee;
  --card: #ffffff;
  --ink: #33302b;
  --muted: #8a857b;
  --primary: #d97742;      /* 暖橙 */
  --primary-dark: #b85c2c;
  --teal: #3d8b7d;
  --red: #c0392b;
  --green: #2e8b57;
  --border: #e5dfd4;
  --shadow: 0 2px 10px rgba(80, 60, 30, .08);
  --radius: 14px;
  --serif: "Songti SC", "STSong", "SimSun", "Kaiti SC", "STKaiti", "KaiTi", serif;
  --sans: "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: var(--sans); background: var(--bg); color: var(--ink); line-height: 1.7; }
main { max-width: 860px; margin: 0 auto; padding: 16px 14px 60px; }
h2 { font-size: 1.35rem; margin: 18px 0 12px; }

.hidden { display: none !important; }
.muted { color: var(--muted); font-size: .86rem; }

/* 顶栏 */
#topbar { background: var(--card); border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 20; }
.topbar-inner { max-width: 860px; margin: 0 auto; padding: 10px 14px; display: flex; justify-content: space-between; align-items: center; }
.brand { font-weight: 700; font-size: 1.05rem; color: var(--primary-dark); }
.badge { background: #fdf0e6; color: var(--primary-dark); border-radius: 999px; padding: 2px 10px; font-size: .78rem; margin-right: 8px; }

/* 卡片 */
.card { background: var(--card); border-radius: var(--radius); box-shadow: var(--shadow); padding: 20px; margin-bottom: 14px; border: 1px solid var(--border); }
.center-card { max-width: 460px; margin: 40px auto; }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 12px; }
.passage-card { cursor: pointer; transition: transform .12s, box-shadow .12s; }
.passage-card:hover { transform: translateY(-2px); box-shadow: 0 6px 18px rgba(80,60,30,.14); }
.passage-card .title { font-weight: 700; font-size: 1.02rem; }
.passage-card .meta { display: flex; gap: 8px; margin-top: 8px; flex-wrap: wrap; }

/* 标签与芯片 */
.chip { display: inline-block; padding: 1px 10px; border-radius: 999px; font-size: .76rem; background: #f3efe7; color: #6d675c; }
.chip.type { background: #e8f1ee; color: var(--teal); }
.chip.diff { background: #fdf0e6; color: var(--primary-dark); }
.chips { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 14px; }
.chip-btn { cursor: pointer; border: 1px solid var(--border); background: var(--card); border-radius: 999px; padding: 4px 14px; font-size: .86rem; color: var(--muted); }
.chip-btn.active { background: var(--primary); border-color: var(--primary); color: #fff; }

/* 按钮 */
.btn { border: none; border-radius: 10px; padding: 9px 18px; font-size: .92rem; cursor: pointer; background: #efeae0; color: var(--ink); transition: filter .12s; }
.btn:hover { filter: brightness(.96); }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-teal { background: var(--teal); color: #fff; }
.btn-ghost { background: transparent; color: var(--muted); }
.btn-danger { background: #fbeae7; color: var(--red); }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn-sm { padding: 4px 12px; font-size: .82rem; border-radius: 8px; }

/* 表单 */
.form label { display: block; margin: 12px 0 4px; font-size: .88rem; color: var(--muted); }
.form input, .form textarea, .form select { width: 100%; padding: 9px 12px; border: 1px solid var(--border); border-radius: 10px; font-size: .95rem; font-family: var(--sans); background: #fff; color: var(--ink); }
.form input:focus, .form textarea:focus { outline: 2px solid #f0c9a8; border-color: var(--primary); }
.form .btn { margin-top: 14px; width: 100%; }

/* 登录 tabs */
.tabs { display: flex; gap: 6px; margin-bottom: 14px; background: #f1ece2; border-radius: 12px; padding: 4px; }
.tab { flex: 1; border: none; background: transparent; padding: 8px; border-radius: 9px; cursor: pointer; font-size: .92rem; color: var(--muted); }
.tab.active { background: #fff; color: var(--primary-dark); font-weight: 600; box-shadow: 0 1px 4px rgba(0,0,0,.06); }
.msg { margin-top: 10px; font-size: .86rem; min-height: 1.2em; }
.msg.err { color: var(--red); }
.msg.ok { color: var(--green); }

/* 阅读器 */
.reader-head { display: flex; align-items: center; gap: 10px; margin-bottom: 10px; flex-wrap: wrap; }
.reader-title { font-weight: 700; font-size: 1.05rem; flex: 1; }
.timer { font-variant-numeric: tabular-nums; color: var(--primary-dark); background: #fdf0e6; padding: 2px 10px; border-radius: 999px; font-size: .85rem; }
.passage-text { font-family: var(--serif); font-size: 1.06rem; line-height: 2.05; background: #fffdf8; border: 1px solid var(--border); border-radius: var(--radius); padding: 18px 20px; margin-bottom: 14px; white-space: pre-wrap; max-height: 46vh; overflow-y: auto; }
.passage-text.collapsed { max-height: 0; padding-top: 0; padding-bottom: 0; border-width: 0; margin-bottom: 0; overflow: hidden; }
.passage-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 8px; }
.q-card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px 20px; margin-bottom: 14px; }
.q-card .q-text { font-size: 1.02rem; margin: 8px 0 12px; }
.q-card textarea { width: 100%; min-height: 110px; padding: 10px 12px; border: 1px solid var(--border); border-radius: 10px; font-size: .98rem; font-family: var(--sans); line-height: 1.8; }
.q-card textarea:focus { outline: 2px solid #f0c9a8; }
.score-box { background: #fbf7ef; border: 1px solid var(--border); border-radius: 12px; padding: 14px 16px; margin-top: 12px; }
.score-big { font-size: 2.2rem; font-weight: 800; color: var(--primary-dark); }
.score-big small { font-size: 1rem; color: var(--muted); }
.suggest li { margin: 4px 0 4px 18px; font-size: .92rem; }

/* 进度 */
.progress-wrap { display: flex; align-items: center; gap: 10px; margin: 8px 0; }
.progress { flex: 1; height: 10px; background: #efeae0; border-radius: 999px; overflow: hidden; }
.progress > div { height: 100%; background: var(--primary); border-radius: 999px; transition: width .4s; }
.stat-row { display: flex; gap: 10px; margin: 10px 0; flex-wrap: wrap; }
.stat { flex: 1; min-width: 100px; background: #fbf8f1; border-radius: 12px; padding: 10px 12px; text-align: center; }
.stat .num { font-size: 1.5rem; font-weight: 800; color: var(--primary-dark); }
.stat .lbl { font-size: .78rem; color: var(--muted); }

/* 审核 */
.review-item { border: 1px solid var(--border); border-radius: 12px; padding: 12px 14px; margin-bottom: 10px; background: #fff; }
.review-item .qa { margin: 6px 0; font-size: .92rem; }
.review-item .ans { background: #f8f5ee; border-radius: 8px; padding: 8px 10px; margin-top: 4px; }
.flag { color: var(--red); font-size: .8rem; }
.oktag { color: var(--green); }

/* 分析 */
.chart-wrap { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 14px; margin-bottom: 14px; }
.chart-wrap h4 { margin-bottom: 8px; font-size: .95rem; }
canvas { width: 100%; height: 200px; display: block; }

/* 表格 */
table { width: 100%; border-collapse: collapse; font-size: .86rem; }
th, td { border-bottom: 1px solid var(--border); padding: 7px 8px; text-align: left; vertical-align: top; }
th { color: var(--muted); font-weight: 600; }

/* 提示 */
.tips { font-size: .84rem; color: var(--teal); background: #eef6f3; border-radius: 8px; padding: 8px 10px; margin-top: 10px; }
.toast { position: fixed; left: 50%; bottom: 30px; transform: translateX(-50%); background: #333; color: #fff; padding: 10px 22px; border-radius: 999px; font-size: .9rem; z-index: 99; box-shadow: 0 4px 16px rgba(0,0,0,.25); }
.banner { background: #fff7e8; border: 1px solid #f2d9a6; border-radius: 12px; padding: 12px 14px; margin-bottom: 12px; font-size: .9rem; }
.banner.warn { background: #fdf0ee; border-color: #f0c4bb; }

@media (max-width: 600px) {
  main { padding: 10px 8px 50px; }
  .passage-text { font-size: 1rem; padding: 14px; }
}