/* 作业回顾问卷系统 · 样式。手机优先（360px 起），系统字体，不加载任何外部资源。 */
:root {
  --bg: #f4f5f7;
  --card: #ffffff;
  --ink: #1d2433;
  --muted: #5d6676;
  --line: #d9dde5;
  --primary: #0f6b5f;
  --primary-ink: #ffffff;
  --primary-soft: #e3f2ef;
  --warn: #9a5b00;
  --warn-soft: #fff3dc;
  --danger: #b3261e;
  --danger-soft: #fdeceb;
  --ok: #176b36;
  --ok-soft: #e4f5ea;
  --radius: 12px;
  --shadow: 0 1px 2px rgba(20, 30, 50, 0.06), 0 2px 8px rgba(20, 30, 50, 0.04);
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14181f;
    --card: #1d232d;
    --ink: #e8ebf0;
    --muted: #9aa4b5;
    --line: #333b49;
    --primary: #3fb8a5;
    --primary-ink: #0b1f1b;
    --primary-soft: #1a3a35;
    --warn: #f0b95b;
    --warn-soft: #3a2e14;
    --danger: #ff8a80;
    --danger-soft: #3d1f1d;
    --ok: #6fdc95;
    --ok-soft: #173424;
    --shadow: none;
  }
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
}
a { color: var(--primary); }
h1, h2, h3 { line-height: 1.35; margin: 0; }
h1 { font-size: 1.45rem; }
h2 { font-size: 1.15rem; }
h3 { font-size: 1rem; }
p { margin: 0.5em 0; }

.wrap { max-width: 720px; margin: 0 auto; padding: 16px 16px 72px; }
.wrap.wide { max-width: 1100px; }
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 16px;
  margin: 12px 0;
}
.muted { color: var(--muted); }
.small { font-size: 0.875rem; }
.center { text-align: center; }
.brand { color: var(--muted); font-size: 0.8125rem; margin-bottom: 4px; }
.subtitle { color: var(--muted); margin-top: 6px; }

/* 按钮 */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  min-height: 44px; padding: 0 18px;
  border: 1px solid var(--primary); border-radius: 10px;
  background: var(--primary); color: var(--primary-ink);
  font: inherit; font-weight: 600; text-decoration: none; cursor: pointer;
}
.btn.ghost { background: transparent; color: var(--primary); }
.btn.danger { background: var(--danger); border-color: var(--danger); color: #fff; }
.btn.small { min-height: 34px; padding: 0 12px; font-size: 0.875rem; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-row { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 14px; }
.btn-row .btn { flex: 1 1 140px; }

/* 提示条 */
.notice { padding: 10px 12px; border-radius: 10px; margin: 12px 0; background: var(--primary-soft); }
.notice.warn { background: var(--warn-soft); color: var(--warn); }
.notice.error { background: var(--danger-soft); color: var(--danger); }
.notice.ok { background: var(--ok-soft); color: var(--ok); }

/* 提示页要点 */
ol.points { padding-left: 1.3em; margin: 8px 0; }
ol.points > li { margin: 10px 0; }
ol.points ul { margin: 6px 0 6px; padding-left: 1.2em; }

/* 问卷 */
.topbar { position: sticky; top: 0; z-index: 5; background: var(--bg); padding: 10px 0 8px; }
.progress { height: 6px; border-radius: 3px; background: var(--line); overflow: hidden; }
.progress > i { display: block; height: 100%; background: var(--primary); width: 0; transition: width 0.25s; }
.progress-label { display: flex; justify-content: space-between; font-size: 0.8125rem; color: var(--muted); margin-top: 4px; }
.resume-box { font-size: 0.875rem; background: var(--primary-soft); border-radius: 10px; padding: 8px 12px; margin: 8px 0; }
.resume-box b { font-size: 1.05rem; letter-spacing: 0.12em; font-family: ui-monospace, Menlo, Consolas, monospace; }

.survey { counter-reset: qn; }
.q { counter-increment: qn; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 14px 10px; margin: 12px 0; }
.q.has-error { border-color: var(--danger); }
.q-title::before { content: counter(qn) ". "; color: var(--muted); font-weight: 400; }
.q-title { font-weight: 600; }
.q-note, .q-hint { font-size: 0.875rem; color: var(--muted); margin: 4px 0 0; }
.q-err { color: var(--danger); font-size: 0.875rem; margin: 6px 0 0; }
.q-body { margin-top: 10px; }
fieldset { border: 0; padding: 0; margin: 0; min-width: 0; }

.opt { display: flex; align-items: flex-start; gap: 10px; padding: 10px 10px; margin: 6px 0; border: 1px solid var(--line); border-radius: 10px; cursor: pointer; }
.opt input { margin-top: 4px; width: 18px; height: 18px; flex: none; accent-color: var(--primary); }
.opt.on { border-color: var(--primary); background: var(--primary-soft); }
.opt.off { opacity: 0.5; }
.other-input, .text-input, textarea, select, input[type="text"], input[type="date"], input[type="password"] {
  width: 100%; font: inherit; color: var(--ink); background: var(--card);
  border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; min-height: 44px;
}
textarea { resize: vertical; min-height: 88px; }
.other-input { margin: 0 0 6px 28px; width: calc(100% - 28px); }
.counter { text-align: right; font-size: 0.75rem; color: var(--muted); }

.grid-row { padding: 10px 0; border-top: 1px dashed var(--line); }
.grid-row:first-child { border-top: 0; padding-top: 0; }
.grid-row.has-error .grid-label { color: var(--danger); }
.grid-label { font-size: 0.9375rem; margin-bottom: 6px; }
.pills { display: flex; flex-wrap: wrap; gap: 6px; }
.pills.two { display: grid; grid-template-columns: 1fr 1fr; }
.pills.two .pill span { font-size: 0.875rem; line-height: 1.35; display: flex; align-items: center; justify-content: center; min-height: 48px; }
.grid-row.done .grid-label::after { content: " ✓"; color: var(--primary); font-weight: 700; }
.q-count { float: right; font-size: 0.8125rem; font-weight: 400; color: var(--muted); font-variant-numeric: tabular-nums; }
.nav-hint { text-align: center; font-size: 0.875rem; color: var(--muted); margin: 14px 0 -6px; }
.nav-hint.ok { color: var(--ok); }
.pill { position: relative; flex: 1 1 auto; }
.pill input { position: absolute; opacity: 0; inset: 0; width: 100%; height: 100%; margin: 0; cursor: pointer; }
.pill span { display: block; text-align: center; padding: 8px 10px; min-height: 40px; border: 1px solid var(--line); border-radius: 10px; font-size: 0.9375rem; }
.pill input:checked + span { background: var(--primary); border-color: var(--primary); color: var(--primary-ink); font-weight: 600; }
.pill input:focus-visible + span { outline: 2px solid var(--primary); outline-offset: 2px; }

.nav { display: flex; gap: 10px; margin-top: 18px; }
.nav .btn { flex: 1; }
.id-fields { display: grid; gap: 10px; grid-template-columns: 1fr 1fr; }
.id-fields label { font-size: 0.875rem; color: var(--muted); display: block; }

/* 记录卡 */
.stepper { display: flex; align-items: center; gap: 12px; }
.stepper b { min-width: 4.5em; text-align: center; font-size: 1.25rem; font-variant-numeric: tabular-nums; }
.log-item { display: flex; justify-content: space-between; gap: 10px; padding: 10px 0; border-top: 1px solid var(--line); }
.log-item:first-child { border-top: 0; }
.tag { display: inline-block; font-size: 0.75rem; padding: 1px 8px; border-radius: 999px; background: var(--primary-soft); color: var(--primary); margin: 2px 4px 2px 0; }
.big-number { font-size: 1.8rem; font-weight: 700; font-variant-numeric: tabular-nums; }

/* 表格（后台） */
.table-wrap { overflow-x: auto; }
table { border-collapse: collapse; width: 100%; font-size: 0.875rem; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { font-weight: 600; white-space: nowrap; color: var(--muted); }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; }
.tabs { display: flex; gap: 6px; border-bottom: 1px solid var(--line); margin-top: 12px; }
.tabs button { border: 0; background: none; padding: 10px 14px; font: inherit; color: var(--muted); cursor: pointer; border-bottom: 2px solid transparent; }
.tabs button[aria-selected="true"] { color: var(--primary); border-bottom-color: var(--primary); font-weight: 600; }
.badge { display: inline-block; padding: 1px 8px; border-radius: 999px; font-size: 0.75rem; background: var(--line); }
.badge.open { background: var(--ok-soft); color: var(--ok); }
.badge.closed { background: var(--danger-soft); color: var(--danger); }
.badge.not_open { background: var(--warn-soft); color: var(--warn); }
.inline-form { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin: 8px 0; }
.inline-form input[type="text"] { flex: 1 1 200px; width: auto; }
.inline-form select { width: auto; }
.mono { font-family: ui-monospace, Menlo, Consolas, monospace; word-break: break-all; }

/* 投票 */
.vote-opt { display: flex; gap: 10px; align-items: flex-start; }
.level { font-size: 0.75rem; padding: 0 8px; border-radius: 999px; border: 1px solid var(--line); color: var(--muted); white-space: nowrap; }
.mycard { padding: 8px 12px; border-left: 3px solid var(--primary); background: var(--primary-soft); border-radius: 6px; margin: 6px 0; }

/* 大屏 */
body.screen { font-size: 20px; }
.screen-head { display: flex; justify-content: space-between; align-items: center; gap: 24px; flex-wrap: wrap; }
.screen-head h1 { font-size: 2rem; }
.qr { background: #fff; padding: 8px; border-radius: 8px; line-height: 0; }
.qr svg, .qr img { width: 210px; height: 210px; }
.screen-ask { font-size: 1.5rem; font-weight: 600; margin: 8px 0; color: var(--primary); }
.bar-row { display: grid; grid-template-columns: minmax(180px, 38%) 1fr 3.5em; align-items: center; gap: 12px; margin: 12px 0; }
.bar-track { background: var(--line); border-radius: 8px; height: 30px; overflow: hidden; }
.bar-fill { height: 100%; background: var(--primary); width: 0; transition: width 0.6s; }
.bar-num { font-weight: 700; font-size: 1.4rem; font-variant-numeric: tabular-nums; text-align: right; }
.wall { columns: 3 240px; column-gap: 12px; }
.wall .mycard { break-inside: avoid; font-size: 1rem; }

@media (max-width: 420px) {
  .wrap { padding-left: 12px; padding-right: 12px; }
  .id-fields { grid-template-columns: 1fr; }
  .bar-row { grid-template-columns: 1fr 3em; }
  .bar-row .bar-label { grid-column: 1 / -1; }
}
@media print { .topbar, .nav, .btn { display: none; } }

/* 后台里的小按钮不拉伸 */
.btn-row .btn.small { flex: 0 0 auto; }
.badge { white-space: nowrap; }
td .btn-row { gap: 6px; }

/* ===== 后台：课程看板 ===== */
.tiles { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 10px; margin: 14px 0; }
.tile { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 12px 14px; }
.tile.warn { border-color: var(--warn); background: var(--warn-soft); }
.tile-n { font-size: 1.9rem; font-weight: 700; line-height: 1.1; font-variant-numeric: tabular-nums; }
.tile-l { font-size: 0.9rem; }
.course-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(340px, 1fr)); gap: 14px; align-items: start; }
.course-grid .card { margin: 0; }
.course-head { display: flex; justify-content: space-between; gap: 10px; align-items: flex-start; }
.course-head h2 { font-size: 1.1rem; }
.meter-row { display: flex; justify-content: space-between; align-items: baseline; margin-top: 12px; }
.meter-num b { font-size: 1.8rem; font-variant-numeric: tabular-nums; }
.meter { height: 8px; border-radius: 4px; background: var(--line); overflow: hidden; margin: 4px 0 10px; }
.meter > i { display: block; height: 100%; background: var(--primary); }
.stat-row { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 6px; margin: 10px 0; }
.stat { display: flex; flex-direction: column; background: var(--bg); border-radius: 10px; padding: 6px 10px; }
.stat span { white-space: nowrap; }
.stat b { font-size: 1.15rem; font-variant-numeric: tabular-nums; }
.note { padding: 8px 12px; border-radius: 10px; margin: 8px 0; background: var(--primary-soft); font-size: 0.9rem; }
.note.warn { background: var(--warn-soft); color: var(--warn); }
.note.ok { background: var(--ok-soft); color: var(--ok); }
.btn-row.compact { margin-top: 10px; }
details.menu { border-top: 1px solid var(--line); margin-top: 10px; padding-top: 8px; }
details.menu summary { cursor: pointer; color: var(--muted); font-size: 0.9rem; padding: 4px 0; }
.menu-item { display: flex; flex-direction: column; align-items: flex-start; width: 100%; text-align: left; background: none; border: 0; border-radius: 8px; padding: 8px 6px; font: inherit; color: inherit; cursor: pointer; }
.menu-item:hover { background: var(--bg); }
.bad { color: var(--danger); }

.save-state { color: var(--muted); font-weight: 400; }
.progress-label b { color: var(--ink); }

/* ===== 提示页 ===== */
.flow { list-style: none; display: flex; padding: 0; margin: 14px 0 6px; }
.flow li { flex: 1; display: flex; flex-direction: column; align-items: center; gap: 4px; font-size: 0.8125rem; color: var(--muted); position: relative; }
.flow li::before { content: ""; position: absolute; top: 13px; left: -50%; width: 100%; height: 2px; background: var(--line); z-index: 0; }
.flow li:first-child::before { display: none; }
.flow li i { z-index: 1; width: 28px; height: 28px; border-radius: 50%; background: var(--card); border: 2px solid var(--line); display: grid; place-items: center; font-style: normal; font-size: 0.8125rem; font-weight: 700; }
.flow li.done i { background: var(--primary); border-color: var(--primary); color: var(--primary-ink); }
.flow li.done::before, .flow li.now::before { background: var(--primary); }
.flow li.now i { border-color: var(--primary); color: var(--primary); }
.flow li.now { color: var(--ink); font-weight: 600; }
.gist { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; margin: 14px 0; }
.gist-item { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 10px 8px; text-align: center; display: flex; flex-direction: column; gap: 2px; font-size: 0.9375rem; }
.gist-icon { font-size: 1.4rem; line-height: 1.2; }
.cta-bar { position: fixed; left: 0; right: 0; bottom: 0; z-index: 10; background: var(--card); border-top: 1px solid var(--line); padding: 10px 16px calc(10px + env(safe-area-inset-bottom)); }
.cta-inner { max-width: 720px; margin: 0 auto; display: flex; gap: 10px; }
.cta-inner .btn { flex: 1; }
.cta-inner .btn:first-child { flex: 2; }
.flow.stages { margin: 12px 0; }