:root {
  --bg: #faf8f3;
  --card: #ffffff;
  --ink: #1f2421;
  --ink-2: #5d665f;
  --ink-3: #949b95;
  --line: #e8e3d8;
  --line-2: #f1ece1;
  --accent: #660874;
  --accent-2: #8a2ba0;
  --accent-soft: #f4e9f7;
  --ochre: #b8503c;
  --ochre-soft: #f7e9e4;
  --gold: #b8892a;
  --gold-soft: #f9f0d9;
  --green: #4a7f5c;
  --green-soft: #e9f1e0;
  --serif: "Songti SC", "STSong", "Noto Serif SC", "SimSun", Georgia, serif;
  --sans: "PingFang SC", "Microsoft YaHei", -apple-system, "Segoe UI", sans-serif;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(31, 36, 33, .04), 0 8px 24px -12px rgba(31, 36, 33, .18);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 14px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 { font-family: var(--serif); font-weight: 600; margin: 0; letter-spacing: .01em; }
a { color: var(--accent); text-decoration: none; }
button { font-family: inherit; }
select, input, textarea { font-family: inherit; font-size: 13px; color: var(--ink); }

/* ---------------- topbar ---------------- */
.topbar {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; gap: 13px;
  padding: 12px 28px;
  background: rgba(250, 248, 243, .92);
  backdrop-filter: saturate(1.2) blur(8px);
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 10px; flex: 0 0 auto; }
.mark {
  width: 34px; height: 34px; border-radius: 9px; background: var(--accent);
  color: #faf8f3; font-family: var(--serif); font-size: 14px; font-weight: 600;
  display: grid; place-items: center; letter-spacing: .04em;
}
/* 徽标里的字形图片：容器尺寸不变，图片按比例自适应居中 */
.mark img { width: 88%; height: 88%; object-fit: contain; display: block; }
.brand-text h1 { font-size: 17px; line-height: 1.2; }
.brand-text p { margin: 0; font-size: 11px; color: var(--ink-3); letter-spacing: .06em; }

.pickers { display: flex; gap: 14px; flex: 0 0 auto; }
.picker { display: flex; align-items: center; gap: 7px; font-size: 12px; color: var(--ink-2); white-space: nowrap; }
.picker > span { flex: 0 0 auto; }
.picker select {
  border: 1px solid var(--line); background: #fff; border-radius: 9px;
  padding: 6px 26px 6px 10px; appearance: none; cursor: pointer;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M1 1l4 4 4-4' fill='none' stroke='%235d665f' stroke-width='1.4'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right 9px center;
  max-width: 220px;
}
.picker select:focus { outline: 2px solid var(--accent-soft); border-color: var(--accent-2); }

/* 顶栏学校名：书法体 + 清华紫，字号略大于周边导航。
   书法字体依赖本机安装（华文行楷随 Office 提供），缺字时逐级回退到楷体、宋体。 */
.school-name {
  flex: 0 0 auto; max-width: 300px;
  font-family: "华文行楷", STXingkai, "华文隶书", STLiti, "楷体", KaiTi, "Noto Serif SC", serif;
  font-size: clamp(16px, 2.2vw, 22px); line-height: 1.1;
  color: var(--accent);
  letter-spacing: .06em;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.school-name:empty { display: none; }

/* 导航在窄屏可横向滚动，但不能把学校名挤掉；空间富余时标签靠右 */
.tabs { display: flex; gap: 2px; flex: 1 1 auto; min-width: 0; overflow-x: auto; scrollbar-width: none; }
.tabs::-webkit-scrollbar { display: none; }
.tabs a:first-child { margin-left: auto; }
.tabs a {
  flex: 0 0 auto; white-space: nowrap;
  padding: 6px 8px; border-radius: 9px; color: var(--ink-2); font-size: 13px;
}
.tabs a:hover { background: #fff; color: var(--ink); }
.tabs a.on { background: var(--accent); color: #fff; }

/* ---------------- layout ---------------- */
main { max-width: 1180px; margin: 0 auto; padding: 26px 28px 72px; }
.page-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 16px; margin-bottom: 18px; }
.page-head h2 { font-size: 22px; }
.page-head .sub { color: var(--ink-2); font-size: 13px; margin-top: 3px; }
.page-head .actions { display: flex; gap: 8px; flex-wrap: wrap; }

.grid { display: grid; gap: 16px; }
.g2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.g3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.g4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.g-2-1 { grid-template-columns: minmax(0, 2fr) minmax(0, 1fr); }
.g-1-2 { grid-template-columns: minmax(0, 1fr) minmax(0, 2fr); }
@media (max-width: 980px) {
  .g2, .g3, .g4, .g-2-1, .g-1-2 { grid-template-columns: minmax(0, 1fr); }
  .topbar { flex-wrap: wrap; gap: 12px; }
  .tabs { overflow-x: auto; width: 100%; }
  main { padding: 18px 14px 60px; }
}

.card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 18px 20px; box-shadow: var(--shadow);
}
.card.tight { padding: 14px 16px; }
.card-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 12px; }
.card-head h3 { font-size: 15px; }
.card-head .hint { font-size: 12px; color: var(--ink-3); }
.card-head .tools { display: flex; gap: 6px; }

/* ---------------- kpi ---------------- */
.kpi { display: flex; flex-direction: column; gap: 4px; }
.kpi .label { font-size: 12px; color: var(--ink-2); }
.kpi .value { font-family: var(--serif); font-size: 30px; line-height: 1.1; }
.kpi .value small { font-size: 13px; color: var(--ink-3); font-family: var(--sans); margin-left: 2px; }
.kpi .foot { font-size: 12px; color: var(--ink-3); }

/* ---------------- buttons ---------------- */
.btn {
  display: inline-flex; align-items: center; gap: 6px; cursor: pointer;
  border: 1px solid var(--line); background: #fff; color: var(--ink);
  padding: 7px 14px; border-radius: 9px; font-size: 13px; transition: .15s;
}
.btn:hover { border-color: var(--accent-2); color: var(--accent); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.primary:hover { background: var(--accent-2); color: #fff; }
.btn.ghost { background: transparent; border-color: transparent; color: var(--ink-2); }
.btn.ghost:hover { background: #fff; }
.btn.danger { color: var(--ochre); border-color: #eccfc7; background: #fff; }
.btn.danger:hover { background: var(--ochre-soft); }
.btn.sm { padding: 4px 10px; font-size: 12px; border-radius: 7px; }
.btn:disabled { opacity: .45; cursor: not-allowed; }

/* ---------------- table ---------------- */
.table-wrap { overflow: auto; border: 1px solid var(--line); border-radius: 12px; background: #fff; }
/* 必须显式 display:table。否则会被上方的 .grid{display:grid} 命中：
   <table class="grid"> 变成 grid 容器，thead / tbody 各成一个 grid item，
   两套独立的自动列宽 → 从第二列起逐列累积错位（实测末列偏 136px），还多出 gap 空隙。 */
table.grid { display: table; width: 100%; border-collapse: collapse; border-spacing: 0; font-size: 13px; }
table.grid th, table.grid td { padding: 9px 12px; text-align: left; border-bottom: 1px solid var(--line-2); white-space: nowrap; }
table.grid th {
  background: #fcfaf5; font-weight: 500; color: var(--ink-2); font-size: 12px;
  position: sticky; top: 0; z-index: 2; border-bottom: 1px solid var(--line);
}
table.grid tbody tr:hover { background: #fcfbf7; }
/* 列宽约定：列表页表格在 th 上用百分比分配宽度（合计 100%）。
   早期只给部分列写固定 px、留一列不设宽度，结果那列（学生名单的「姓名」、
   考试页的「考试名称」、系统管理的「学校」）把整张表的富余宽度全吃掉，
   出现「姓名」和「性别」之间空出半屏的问题。 */
table.grid td.num, table.grid th.num { text-align: right; font-variant-numeric: tabular-nums; }
table.grid td.center, table.grid th.center { text-align: center; }
table.grid tr.total-row td { font-weight: 600; background: #fcfaf5; }
.muted { color: var(--ink-3); }
.small { font-size: 12px; }

/* ---------------- chips / level ---------------- */
.chip {
  display: inline-flex; align-items: center; gap: 4px; padding: 2px 9px;
  border-radius: 20px; font-size: 12px; border: 1px solid transparent;
}
.chip.优秀 { background: var(--accent-soft); color: var(--accent); }
.chip.良好 { background: #eaf2e6; color: var(--green); }
.chip.待巩固 { background: var(--gold-soft); color: var(--gold); }
.chip.薄弱 { background: var(--ochre-soft); color: var(--ochre); }
.chip.plain { background: #f4f1ea; color: var(--ink-2); }
.chip.dot::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: currentColor; }

.tag { font-size: 11px; padding: 1px 7px; border-radius: 5px; background: #f4f1ea; color: var(--ink-2); }
.tag.warn { background: var(--gold-soft); color: var(--gold); }
.tag.danger { background: var(--ochre-soft); color: var(--ochre); }
.tag.ok { background: var(--accent-soft); color: var(--accent); }
.tag.info { background: #eef1f4; color: #5d6b78; }

/* ---------------- charts ---------------- */
.chart { width: 100%; }
.h240 { height: 240px; } .h280 { height: 280px; } .h320 { height: 320px; } .h360 { height: 360px; } .h420 { height: 420px; }

/* ---------------- progress bar in table ---------------- */
.bar { position: relative; height: 6px; border-radius: 4px; background: #f0ece2; min-width: 60px; }
.bar > i { position: absolute; inset: 0 auto 0 0; border-radius: 4px; background: var(--accent-2); }
.bar.gold > i { background: var(--gold); }
.bar.ochre > i { background: var(--ochre); }

/* ---------------- suggestions ---------------- */
.sug { border: 1px solid var(--line); border-radius: 12px; padding: 13px 15px; background: #fff; }
.sug + .sug { margin-top: 10px; }
.sug .sug-head { display: flex; align-items: center; gap: 8px; margin-bottom: 5px; }
.sug .sug-head strong { font-family: var(--serif); font-size: 14px; font-weight: 600; }
.sug p { margin: 0; font-size: 13px; color: var(--ink-2); }
.sug.danger { border-left: 3px solid var(--ochre); }
.sug.warn { border-left: 3px solid var(--gold); }
.sug.info { border-left: 3px solid #b9c2c9; }
.sug.ok { border-left: 3px solid var(--accent-2); }

/* ---------------- score entry ---------------- */
.entry-wrap { overflow: auto; max-height: 66vh; border: 1px solid var(--line); border-radius: 12px; background: #fff; }
table.entry { border-collapse: separate; border-spacing: 0; font-size: 12.5px; }
table.entry th, table.entry td { border-bottom: 1px solid var(--line-2); border-right: 1px solid var(--line-2); padding: 0; }
table.entry th {
  background: #fcfaf5; position: sticky; top: 0; z-index: 3; padding: 8px 10px;
  font-weight: 500; color: var(--ink-2); font-size: 12px; border-bottom: 1px solid var(--line);
}
table.entry th.name, table.entry td.name {
  position: sticky; left: 0; z-index: 4; background: #fff; min-width: 104px;
  padding: 7px 12px; border-right: 1px solid var(--line); white-space: nowrap;
}
table.entry th.name { z-index: 5; background: #fcfaf5; }
table.entry td input {
  width: 52px; border: 0; padding: 8px 4px; text-align: center; background: transparent;
  font-variant-numeric: tabular-nums; outline: none;
}
table.entry td input:focus { background: var(--accent-soft); box-shadow: inset 0 0 0 1px var(--accent-2); }
table.entry td input.lost { color: var(--ochre); font-weight: 600; }
table.entry td input.over { color: #fff; background: var(--ochre); }
table.entry td input.absent { color: var(--ink-3); text-decoration: line-through; }
table.entry td.sum { padding: 7px 10px; text-align: right; font-variant-numeric: tabular-nums; }
table.entry td.flag { padding: 7px 8px; text-align: center; }
table.entry tr.absent-row td.name { color: var(--ink-3); }

/* ---------------- form ---------------- */
.field { display: flex; flex-direction: column; gap: 5px; }
.field > span { font-size: 12px; color: var(--ink-2); }
.field input, .field select, .field textarea {
  border: 1px solid var(--line); border-radius: 9px; padding: 8px 10px; background: #fff; width: 100%;
}
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none; border-color: var(--accent-2); box-shadow: 0 0 0 3px var(--accent-soft);
}
.form-row { display: grid; gap: 12px; grid-template-columns: repeat(2, minmax(0, 1fr)); }

/* ---------------- modal ---------------- */
.mask {
  position: fixed; inset: 0; background: rgba(31, 36, 33, .38); z-index: 100;
  display: grid; place-items: center; padding: 24px;
}
.modal {
  background: #fff; border-radius: 16px; width: min(560px, 100%); padding: 22px 24px;
  box-shadow: 0 24px 60px -20px rgba(0, 0, 0, .35); max-height: 86vh; overflow: auto;
}
.modal.wide { width: min(760px, 100%); }
.modal h3 { font-size: 17px; margin-bottom: 4px; }
.modal .hint { color: var(--ink-3); font-size: 12px; margin-bottom: 16px; }
.modal-foot { display: flex; justify-content: flex-end; gap: 8px; margin-top: 20px; }

/* ---------------- toast ---------------- */
.toast {
  position: fixed; left: 50%; bottom: 32px; transform: translate(-50%, 20px);
  background: #1f2421; color: #fff; padding: 9px 18px; border-radius: 10px;
  font-size: 13px; opacity: 0; pointer-events: none; transition: .22s; z-index: 200;
}
.toast.on { opacity: 1; transform: translate(-50%, 0); }

/* ---------------- misc ---------------- */
.loading { padding: 80px 0; text-align: center; color: var(--ink-3); }
.empty { padding: 40px 10px; text-align: center; color: var(--ink-3); }
.empty strong { display: block; color: var(--ink-2); font-family: var(--serif); font-size: 15px; margin-bottom: 6px; }
.divider { height: 1px; background: var(--line); margin: 16px 0; }
.stack { display: flex; flex-direction: column; gap: 8px; }
.row { display: flex; align-items: center; gap: 8px; }
.spacer { flex: 1; }
.pill { display: inline-flex; align-items: center; gap: 6px; background: #f4f1ea; border-radius: 20px; padding: 3px 10px; font-size: 12px; color: var(--ink-2); }
.hl { color: var(--accent); font-weight: 600; }
.hl-warn { color: var(--ochre); font-weight: 600; }
.note-box { border: 1px dashed var(--line); border-radius: 10px; padding: 10px 12px; background: #fcfaf5; }

/* ---------------- report ---------------- */
.report-head {
  background: linear-gradient(180deg, #ffffff 0%, #fdfcf8 100%);
  border: 1px solid var(--line); border-radius: 16px; padding: 22px 24px; margin-bottom: 16px;
}
.report-head .who { display: flex; align-items: baseline; gap: 12px; flex-wrap: wrap; }
.report-head h2 { font-size: 24px; }
.report-head .meta { color: var(--ink-2); font-size: 13px; }
.report-head .score-line { display: flex; align-items: baseline; gap: 10px; margin-top: 10px; }
.report-head .big { font-family: var(--serif); font-size: 40px; line-height: 1; }
.action-list { counter-reset: a; list-style: none; padding: 0; margin: 0; }
.action-list li {
  counter-increment: a; position: relative; padding: 10px 0 10px 34px; border-bottom: 1px dashed var(--line-2);
  font-size: 13px;
}
.action-list li:last-child { border-bottom: 0; }
.action-list li::before {
  content: counter(a); position: absolute; left: 0; top: 10px; width: 22px; height: 22px;
  border-radius: 50%; background: var(--accent-soft); color: var(--accent);
  display: grid; place-items: center; font-size: 12px; font-family: var(--serif);
}
.action-list b { font-family: var(--serif); }

@media print {
  .no-print { display: none !important; }
  body { background: #fff; }
  main { padding: 0; max-width: none; }
  .card, .report-head { box-shadow: none; break-inside: avoid; }
  .chart { break-inside: avoid; }
}

/* ---------------- 知识库 ---------------- */
.seg { display: inline-flex; background: #f4f1ea; border-radius: 10px; padding: 3px; gap: 2px; }
.seg button {
  border: 0; background: transparent; padding: 6px 14px; border-radius: 8px;
  font-size: 13px; color: var(--ink-2); cursor: pointer;
}
.seg button.on { background: #fff; color: var(--accent); box-shadow: 0 1px 3px rgba(0,0,0,.08); }

.chipbar { display: flex; flex-wrap: wrap; gap: 8px; }
.chipbtn {
  border: 1px solid var(--line); background: #fff; color: var(--ink-2);
  border-radius: 20px; padding: 5px 13px; font-size: 12.5px; cursor: pointer; transition: .14s;
}
.chipbtn:hover { border-color: var(--accent-2); color: var(--accent); }
.chipbtn.on { background: var(--accent); border-color: var(--accent); color: #fff; }
.chipbtn.sm { padding: 3px 10px; font-size: 12px; }

.kb-topic { border: 1px solid var(--line); border-radius: 12px; background: #fff; margin-bottom: 12px; overflow: hidden; }
.kb-topic > summary {
  list-style: none; cursor: pointer; padding: 14px 16px; display: flex; align-items: flex-start; gap: 10px;
}
.kb-topic > summary::-webkit-details-marker { display: none; }
.kb-topic > summary:hover { background: #fcfbf7; }
.kb-topic .mod-tag {
  flex: 0 0 auto; font-size: 11px; padding: 2px 8px; border-radius: 6px;
  background: var(--accent-soft); color: var(--accent); margin-top: 2px;
}
.kb-topic h4 { font-size: 15px; margin: 0 0 3px; }
.kb-topic .intro { font-size: 12.5px; color: var(--ink-3); margin: 0; }
.kb-body { padding: 0 16px 14px 16px; }
.kb-point { border-top: 1px dashed var(--line-2); padding: 10px 0; }
.kb-point:first-child { border-top: 0; }
.kb-point .pt { font-family: var(--serif); font-size: 13.5px; font-weight: 600; margin-bottom: 3px; }
.kb-point .pb { font-size: 13px; color: var(--ink-2); }
.kb-point .ref { font-size: 11.5px; color: var(--ink-3); margin-top: 3px; }

.unit-item { border: 1px solid var(--line); border-radius: 12px; background: #fff; padding: 12px 14px; margin-bottom: 10px; cursor: pointer; }
.unit-item:hover { border-color: var(--accent-2); }
.unit-item .u-head { display: flex; align-items: baseline; gap: 8px; }
.unit-item .u-no { font-family: var(--serif); color: var(--accent); font-size: 13px; }
.unit-item .u-title { font-family: var(--serif); font-size: 15px; }
.unit-item .u-texts { font-size: 12px; color: var(--ink-3); margin-top: 4px; }

/* ---------------- 答题 ---------------- */
.q-card { border: 1px solid var(--line); border-radius: 14px; background: #fff; padding: 18px 20px; margin-bottom: 14px; }
.q-card .q-head { display: flex; align-items: center; gap: 8px; margin-bottom: 10px; }
.q-no { width: 26px; height: 26px; border-radius: 8px; background: var(--accent-soft); color: var(--accent);
  display: grid; place-items: center; font-family: var(--serif); font-size: 13px; }
.q-stem { font-size: 14.5px; line-height: 1.75; margin-bottom: 12px; white-space: pre-wrap; }
.opt {
  display: flex; gap: 10px; align-items: flex-start; border: 1px solid var(--line); border-radius: 10px;
  padding: 9px 12px; margin-bottom: 8px; cursor: pointer; font-size: 13.5px; transition: .12s;
}
.opt:hover { border-color: var(--accent-2); background: #fcfbf7; }
.opt.on { border-color: var(--accent); background: var(--accent-soft); }
.opt .key { font-family: var(--serif); color: var(--accent); font-weight: 600; }
.q-input, .q-area {
  width: 100%; border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px;
  font-size: 13.5px; line-height: 1.7; background: #fcfbf7;
}
.q-area { min-height: 90px; resize: vertical; }
.q-input:focus, .q-area:focus { outline: none; border-color: var(--accent-2); background: #fff; box-shadow: 0 0 0 3px var(--accent-soft); }
.q-result { margin-top: 12px; border-top: 1px dashed var(--line); padding-top: 12px; }
.q-result .mark { font-size: 12px; padding: 2px 9px; border-radius: 20px; }
.q-result .mark.right { background: var(--accent-soft); color: var(--accent); }
.q-result .mark.wrong { background: var(--ochre-soft); color: var(--ochre); }
.q-result .mark.pending { background: var(--gold-soft); color: var(--gold); }
.ans-box { background: #fbf9f3; border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; margin-top: 8px; font-size: 13px; }
.ans-box b { font-family: var(--serif); }
.sticky-bar {
  position: sticky; bottom: 0; background: rgba(250,248,243,.94); backdrop-filter: blur(6px);
  border-top: 1px solid var(--line); padding: 12px 0; margin-top: 6px; display: flex; align-items: center; gap: 12px;
}
.score-badge { font-family: var(--serif); font-size: 34px; color: var(--accent); line-height: 1; }
.score-badge small { font-size: 14px; color: var(--ink-3); font-family: var(--sans); }

/* ---------------- 打印 ---------------- */
.print-sheet { max-width: 780px; margin: 0 auto; background: #fff; padding: 40px 46px; }
.print-sheet h1 { font-size: 20px; text-align: center; margin-bottom: 6px; }
.print-sheet .p-meta { text-align: center; font-size: 12px; color: var(--ink-2); margin-bottom: 18px; }
.print-sheet .p-line { border-bottom: 1px solid #ddd; height: 46px; margin: 6px 0; }
.print-sheet .p-q { margin-bottom: 18px; font-size: 13.5px; }
.print-sheet .p-q .stem { margin-bottom: 6px; }
.print-sheet .p-opt { padding-left: 18px; line-height: 1.9; }
@media print {
  .print-sheet { box-shadow: none; padding: 0; }
}

/* ---------------- 登录门 ---------------- */
.login-wrap {
  min-height: calc(100vh - 140px);
  display: grid; place-items: center; padding: 24px 0;
}
.login-card {
  width: min(400px, 92vw);
  background: var(--card); border: 1px solid var(--line); border-radius: 18px;
  padding: 30px 30px 26px; box-shadow: var(--shadow);
}
.login-brand { text-align: center; }
.login-brand .mark.big { width: 56px; height: 56px; font-size: 22px; border-radius: 13px; margin: 0 auto 10px; }
.login-brand .mark.big img { width: 74%; height: 74%; }
.login-brand h2 { font-size: 22px; }
.login-brand p { margin: 2px 0 0; font-size: 12px; color: var(--ink-3); letter-spacing: .12em; }
.login-card .stack { gap: 12px; }
.tiny { font-size: 11px; color: var(--ink-3); }
.ok-text { color: var(--accent); }

.userbox { flex: 0 0 auto; }
#btn-user { border-color: var(--line); }

.invite-code {
  font-family: ui-monospace, Menlo, Consolas, monospace;
  font-size: 24px; letter-spacing: .18em; text-align: center;
  background: var(--accent-soft); color: var(--accent);
  border: 1px dashed var(--accent-2); border-radius: 12px;
  padding: 16px 10px; margin: 14px 0; user-select: all;
}
code.iv {
  font-family: ui-monospace, Menlo, Consolas, monospace;
  font-size: 13px; background: var(--accent-soft); color: var(--accent);
  padding: 2px 8px; border-radius: 6px; letter-spacing: .08em;
}
.btn.danger { background: var(--ochre-soft); color: var(--ochre); border-color: transparent; }

/* ---------------- 移动端适配 ---------------- */
@media (max-width: 640px) {
  html, body { font-size: 15px; }
  .topbar { padding: 10px 14px; gap: 10px; }
  .brand-text p { display: none; }
  .pickers { gap: 8px; flex-wrap: wrap; width: 100%; order: 3; }
  .picker { flex: 1 1 40%; }
  .picker > span { display: none; }
  .picker select { width: 100%; height: 42px; font-size: 14px; }
  .tabs {
    order: 4; width: 100%; overflow-x: auto; -webkit-overflow-scrolling: touch;
    scrollbar-width: none; padding-bottom: 2px;
  }
  .tabs::-webkit-scrollbar { display: none; }
  .tabs a { white-space: nowrap; padding: 8px 13px; font-size: 13px; }
  .userbox { order: 2; margin-left: auto; }
  #btn-user { font-size: 12px; padding: 7px 10px; }

  main { padding: 14px 12px 80px; }
  .page-head { flex-direction: column; align-items: flex-start; gap: 10px; }
  .page-head .actions { width: 100%; flex-wrap: wrap; }
  .page-head .actions .btn { flex: 1 1 auto; justify-content: center; }

  .card { padding: 14px 14px; border-radius: 12px; }
  .grid { gap: 12px; }
  .table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; }
  table.grid { min-width: 560px; }
  table.grid th, table.grid td { padding: 8px 10px; white-space: nowrap; }

  /* 答题页触控优化 */
  .opt { padding: 13px 14px; font-size: 15px; }
  .opt .key { width: 30px; height: 30px; line-height: 30px; font-size: 14px; }
  .q-card { padding: 14px; }
  .q-stem { font-size: 16px; line-height: 1.7; }
  .q-input, .q-area { font-size: 16px; padding: 12px; }
  .sticky-bar { padding: 10px 12px calc(10px + env(safe-area-inset-bottom)); }
  .sticky-bar .btn { padding: 12px 18px; font-size: 15px; }
  .btn { min-height: 44px; }
  .login-card .btn.primary { min-height: 46px; }

  .chipbar { max-height: none !important; }
  .login-card { padding: 24px 20px; }
  .login-wrap { min-height: calc(100vh - 200px); }
  .invite-code { font-size: 19px; letter-spacing: .12em; }
  .modal { width: 94vw; max-height: 86vh; overflow: auto; }
  .chart { min-height: 220px; }
  /* 卡片头在窄屏容易两败俱伤：标题被挤成两行、副标题也被压成两行。
     「标题 + 说明」这类卡片改成上下两行；带按钮的卡片（如＋新建班级）保持一行，
     否则按钮会被顶到第三行孤零零地待着。 */
  .card-head { flex-wrap: wrap; align-items: flex-start; gap: 4px 12px; }
  .card-head h3 { min-width: 0; }
  .card-head .hint { line-height: 1.5; }
  .card-head:not(:has(.btn)) h3,
  .card-head:not(:has(.btn)) .hint { flex: 1 1 100%; }
  .h280 { height: 240px; } .h240 { height: 210px; } .h360 { height: 280px; }
}

/* 手机横屏 / 小平板微调 */
@media (max-width: 860px) and (orientation: landscape) {
  .login-wrap { min-height: auto; padding: 40px 0; }
}

/* 备案信息（页脚）：号码没填时 app.js 会直接移除整个节点，所以这里不用管显隐。
   字号刻意小、颜色刻意淡——它是合规项，不该抢正文的注意力。 */
.site-foot {
  padding: 18px 28px 30px;
  text-align: center;
  font-size: 11.5px;
  color: var(--ink-3);
  line-height: 1.8;
}
.site-foot a { color: var(--ink-3); text-decoration: none; }
.site-foot a:hover { color: var(--accent); text-decoration: underline; }
.site-foot .dot { margin: 0 8px; color: var(--line); }
@media (max-width: 640px) {
  .site-foot { padding: 14px 12px 26px; }
}