/* ============================================================
   作业核对 · 托管班版 UI
   设计要点：柔和冷灰底 + 白卡片 + 靛蓝主色；科目色贯穿列表/分组/色点；
   8px 间距栅格；圆角 12-16px；阴影极轻；触屏目标 ≥40px。
   ============================================================ */
:root {
  --bg: #eef1f6;
  --card: #ffffff;
  --ink: #1a2233;
  --sub: #66708a;
  --faint: #a0a9bd;
  --brand: #3b66f5;
  --brand-deep: #2f52c8;
  --brand-weak: #eaf0ff;
  --ok: #16a34a;
  --ok-weak: #e6f7ed;
  --warn: #d97706;
  --warn-weak: #fdf3e0;
  --bad: #dc2626;
  --bad-weak: #fdecec;
  --line: #e6eaf1;
  --line-strong: #d8dee9;
  --shadow-1: 0 1px 2px rgba(23,32,55,.05), 0 2px 10px rgba(23,32,55,.05);
  --shadow-2: 0 6px 20px rgba(23,32,55,.12);
  --r-sm: 8px; --r-md: 12px; --r-lg: 16px;
  /* 科目色 */
  --s-yw: #e0564f; --s-yw-weak: #fdeceb;
  --s-sx: #2f6fe4; --s-sx-weak: #e9f0fd;
  --s-yy: #8b5cf6; --s-yy-weak: #f1ebfd;
  --s-kx: #0d9d6d; --s-kx-weak: #e5f6ef;
  --s-qt: #64748b; --s-qt-weak: #eef1f5;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-font-smoothing: antialiased; }
body {
  font-family: "PingFang SC", "Microsoft YaHei UI", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  background:
    radial-gradient(1200px 400px at 80% -200px, rgba(59,102,245,.06), transparent 60%),
    var(--bg);
  color: var(--ink); font-size: 15px; line-height: 1.6;
}
::selection { background: rgba(59,102,245,.15); }

/* 滚动条 */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-thumb { background: #c7cfdd; border-radius: 6px; border: 2px solid var(--bg); }
::-webkit-scrollbar-thumb:hover { background: #aeb8ca; }
::-webkit-scrollbar-track { background: transparent; }

/* ---------- 顶栏 ---------- */
.topbar {
  display: flex; align-items: center; gap: 16px;
  padding: 12px 22px; background: rgba(255,255,255,.92); backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
  position: sticky; top: 0; z-index: 5;
}
.brand { display: flex; align-items: center; gap: 10px; min-width: 0; }
.brand-icon {
  width: 38px; height: 38px; border-radius: 11px; flex-shrink: 0;
  background: linear-gradient(135deg, #4d79ff, #2f52c8);
  display: flex; align-items: center; justify-content: center;
  font-size: 19px; box-shadow: 0 3px 8px rgba(47,82,200,.28);
}
.brand-text b { display: block; font-size: 16px; line-height: 1.25; }
.brand-text small { display: block; font-size: 11.5px; color: var(--sub); line-height: 1.2; }

.date-nav {
  display: flex; align-items: center; gap: 2px; margin-left: auto;
  background: #eef1f7; border-radius: 10px; padding: 3px;
}
.date-nav button {
  border: none; background: transparent; color: var(--sub);
  width: 32px; height: 30px; border-radius: 8px; font-size: 15px; cursor: pointer;
  transition: background .12s;
}
.date-nav button:hover { background: #fff; color: var(--ink); box-shadow: 0 1px 3px rgba(23,32,55,.12); }
.date-nav input {
  border: none; background: transparent; text-align: center;
  font-size: 13.5px; font-weight: 600; color: var(--ink);
  width: 108px; padding: 4px 0; font-family: inherit; cursor: pointer;
}
.date-nav .today-btn {
  width: auto; padding: 0 12px; font-size: 13px; font-weight: 500;
}
.date-nav .today-btn.on { background: var(--card); color: var(--brand); font-weight: 600; box-shadow: 0 1px 3px rgba(23,32,55,.12); }

.conn {
  display: flex; align-items: center; gap: 6px;
  font-size: 12px; color: var(--faint);
  background: #f2f4f8; border-radius: 20px; padding: 5px 12px 5px 9px;
  flex-shrink: 0;
}
.conn i {
  width: 8px; height: 8px; border-radius: 50%; background: #c2cad8;
  transition: background .2s;
}
.conn.on { color: var(--ok); background: var(--ok-weak); }
.conn.on i { background: var(--ok); box-shadow: 0 0 0 3px rgba(22,163,74,.15); }

/* ---------- Tab 导航：桌面分段药丸 / 移动端底部栏 ---------- */
.tabs { display: flex; justify-content: center; gap: 4px; padding: 12px 16px 4px; }
.tabs button {
  border: none; background: transparent; color: var(--sub);
  font-size: 14px; padding: 8px 22px; border-radius: 10px; cursor: pointer;
  font-family: inherit; transition: all .15s;
}
.tabs button:hover { color: var(--ink); background: rgba(255,255,255,.7); }
.tabs button.on {
  background: var(--card); color: var(--brand); font-weight: 600;
  box-shadow: var(--shadow-1);
}

main { max-width: 1040px; margin: 0 auto; padding: 14px 20px 40px; }
.view { display: none; animation: fadeIn .18s ease; }
.view.on { display: block; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: none; } }

/* ---------- 统计行 ---------- */
.students-head { display: flex; align-items: flex-start; gap: 12px; }
.students-head .stat-row { flex: 1; margin-bottom: 14px; }
.students-actions { display: flex; align-items: center; gap: 8px; flex-shrink: 0; padding-top: 2px; }
.stat-row { display: flex; gap: 10px; margin-bottom: 14px; flex-wrap: wrap; }
.stat-chip {
  display: inline-flex; align-items: center; gap: 7px;
  background: var(--card); border-radius: 10px; padding: 7px 14px;
  font-size: 13px; color: var(--sub); box-shadow: var(--shadow-1);
}
.stat-chip b { color: var(--ink); font-size: 16px; font-weight: 700; }
.stat-chip .ic { font-size: 15px; }

/* ---------- 科目色点 ---------- */
.dot { display: inline-block; width: 8px; height: 8px; border-radius: 3px; margin-right: 6px; vertical-align: 1px; flex-shrink: 0; }
.dot-语文 { background: var(--s-yw); } .dot-数学 { background: var(--s-sx); }
.dot-英语 { background: var(--s-yy); } .dot-科学 { background: var(--s-kx); }
.dot-其他, .dot-待确认 { background: var(--s-qt); }

/* ---------- 学生卡片（首页） ---------- */
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(310px, 1fr)); gap: 14px; }
.stu-card {
  background: var(--card); border: 1px solid transparent; border-radius: var(--r-lg);
  padding: 16px 18px 12px; cursor: pointer; box-shadow: var(--shadow-1);
  transition: box-shadow .18s, transform .18s, border-color .18s;
  position: relative; overflow: hidden;
}
.stu-card::before {
  content: ""; position: absolute; inset: 0 0 auto 0; height: 3px;
  background: linear-gradient(90deg, var(--brand), #7c9bff);
  opacity: 0; transition: opacity .18s;
}
.stu-card:hover { box-shadow: var(--shadow-2); transform: translateY(-2px); }
.stu-card:hover::before { opacity: 1; }
.stu-card:active { transform: translateY(0); }
.stu-card.card-done { border-color: #b5e8c8; background: linear-gradient(180deg, #f2fbf5, #fff 55%); }
.stu-card.card-done::before { background: linear-gradient(90deg, #2fb568, #7ddba4); opacity: 1; }

.card-head { display: flex; align-items: center; gap: 11px; margin-bottom: 10px; }
.card-head .name { font-weight: 700; font-size: 16.5px; letter-spacing: .5px; }
.avatar {
  width: 40px; height: 40px; border-radius: 13px; flex-shrink: 0;
  font-weight: 700; font-size: 17px;
  display: flex; align-items: center; justify-content: center;
}
.avatar.lg { width: 46px; height: 46px; font-size: 19px; border-radius: 14px; }

.prog-badge {
  margin-left: auto; flex-shrink: 0;
  font-size: 12.5px; font-weight: 600; font-variant-numeric: tabular-nums;
  background: #f1f3f8; color: var(--sub);
  border-radius: 20px; padding: 3px 12px;
  transition: all .2s;
}
.prog-badge.yes { background: var(--ok); color: #fff; box-shadow: 0 2px 6px rgba(22,163,74,.3); }

/* 卡片预览行 */
.prev-item {
  display: flex; gap: 9px; align-items: flex-start;
  padding: 6px 0; font-size: 13.5px; line-height: 1.5; color: var(--ink);
}
.prev-item + .prev-item { border-top: 1px dashed var(--line); }
.prev-mark {
  width: 18px; height: 18px; border-radius: 6px; flex-shrink: 0; margin-top: 2px;
  border: 1.5px solid var(--line-strong); color: transparent;
  font-size: 12px; line-height: 15px; text-align: center;
}
.prev-item.done .prev-mark { background: var(--ok); border-color: var(--ok); color: #fff; }
.prev-item.done .prev-text { color: var(--faint); text-decoration: line-through; }
.prev-text { min-width: 0; }
.prev-more { font-size: 12.5px; color: var(--brand); padding: 6px 0 2px 27px; font-weight: 500; }
.stu-card:hover .prev-more { text-decoration: underline; }

/* ---------- 学生详情页 ---------- */
.detail-top { margin-bottom: 12px; }
.detail-card { cursor: default; margin-bottom: 4px; }
.detail-card:hover { box-shadow: var(--shadow-1); transform: none; }
.detail-card:hover::before { opacity: 0; }
.detail-card.card-done::before { opacity: 1; }
.detail-card .card-head { margin-bottom: 12px; }
.detail-card .row { padding-bottom: 4px; }

.subj-group {
  background: var(--card); border-radius: var(--r-lg);
  box-shadow: var(--shadow-1); overflow: hidden;
}
/* 科目分组横向多栏排布 */
.subj-columns {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(290px, 1fr));
  gap: 12px; margin-top: 12px; align-items: start;
}
.subj-head {
  display: flex; align-items: center; gap: 8px;
  font-weight: 700; font-size: 14.5px;
  padding: 11px 18px; border-bottom: 1px solid var(--line);
}
.subj-head .dot { width: 10px; height: 10px; border-radius: 4px; margin: 0; }
.subj-count {
  margin-left: auto; font-size: 12px; font-weight: 600; font-variant-numeric: tabular-nums;
  color: var(--sub); background: #f1f3f8; border-radius: 20px; padding: 2px 11px;
}
/* 科目色带 */
.g-语文 .subj-head { background: var(--s-yw-weak); color: #b23c36; }
.g-数学 .subj-head { background: var(--s-sx-weak); color: #2356bb; }
.g-英语 .subj-head { background: var(--s-yy-weak); color: #6d3fd1; }
.g-科学 .subj-head { background: var(--s-kx-weak); color: #0a7d56; }
.g-其他 .subj-head { background: var(--s-qt-weak); color: #475569; }
.g-语文 .subj-count, .g-数学 .subj-count, .g-英语 .subj-count, .g-科学 .subj-count, .g-其他 .subj-count { background: rgba(255,255,255,.75); }

/* 条目行（详情页内） */
.item { display: flex; gap: 12px; padding: 12px 18px; align-items: flex-start; }
.item + .item { border-top: 1px solid var(--line); }
.item input[type=checkbox] {
  width: 21px; height: 21px; margin-top: 2px; flex-shrink: 0;
  accent-color: var(--brand); cursor: pointer;
}
.item .body { flex: 1; min-width: 0; }
.subject-chip {
  display: inline-block; padding: 1px 9px; border-radius: 8px;
  font-size: 11.5px; font-weight: 600; background: var(--brand-weak); color: var(--brand);
}
.subject-chip.notice { background: var(--warn-weak); color: var(--warn); }
.item .content { font-size: 15px; line-height: 1.55; margin-top: 4px; word-break: break-all; }
.item.done .content { text-decoration: line-through; color: var(--faint); }
.item.done .subject-chip { opacity: .55; }
.item .meta { font-size: 12px; color: var(--sub); margin-top: 3px; }
.tag-confirm { color: var(--warn); font-size: 12px; font-weight: 600; }
.tag-cancel { color: var(--bad); font-size: 12px; }
.tag-revoke { color: var(--warn); font-size: 12px; }
.att {
  display: inline-flex; align-items: center; gap: 4px;
  font-size: 12.5px; font-weight: 500; color: var(--brand); text-decoration: none;
  background: var(--brand-weak); border-radius: 7px; padding: 3px 9px;
  margin: 6px 6px 0 0; transition: background .12s;
}
.att:hover { background: #dbe7ff; }
.att.missing { color: var(--faint); background: #f4f6f9; }
.att-imgwrap { display: inline-block; margin: 6px 6px 0 0; }
.att-img {
  max-width: 150px; max-height: 105px; border-radius: 9px;
  border: 1px solid var(--line); object-fit: cover; display: block;
  transition: transform .15s, box-shadow .15s;
}
.att-img:hover { transform: scale(1.03); box-shadow: var(--shadow-2); }
.att-grid { display: flex; flex-wrap: wrap; gap: 12px; padding: 12px 16px; }
.att-cell { background: #f8fafc; border: 1px solid var(--line); border-radius: 10px; padding: 8px 10px; }
.att-cell-sub { font-size: 11px; color: var(--sub); margin-bottom: 4px; }
.att-cell .att-img { max-width: 170px; max-height: 120px; }

/* ---------- 作业清单 ---------- */
.item-list { display: flex; flex-direction: column; gap: 10px; }
.hw-card { background: var(--card); border-radius: var(--r-md); padding: 13px 16px; box-shadow: var(--shadow-1); }
.hw-card .head { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.hw-card .content { margin-top: 6px; word-break: break-all; }
.hw-card .meta { font-size: 12px; color: var(--sub); margin-top: 5px; }
.hw-card.cancelled { opacity: .5; }
.hw-card.revoked { border-left: 3px solid var(--warn); }

/* ---------- 历史 ---------- */
.history-list { display: flex; flex-direction: column; gap: 8px; }
.h-row {
  background: var(--card); border-radius: var(--r-md); padding: 10px 16px;
  font-size: 14px; display: flex; gap: 12px; flex-wrap: wrap; align-items: center;
  box-shadow: var(--shadow-1);
}
.h-row .date { color: var(--sub); font-size: 12.5px; min-width: 84px; font-variant-numeric: tabular-nums; }

/* ---------- 设置 ---------- */
.panel {
  background: var(--card); border-radius: var(--r-lg); padding: 18px 20px;
  margin-bottom: 14px; box-shadow: var(--shadow-1);
}
.panel h3 { font-size: 15px; margin-bottom: 12px; display: flex; align-items: center; gap: 7px; }
.panel label { display: block; font-size: 12.5px; color: var(--sub); margin: 10px 0 5px; }
.panel input:not([type=checkbox]), .panel select, .panel textarea {
  width: 100%; border: 1.5px solid var(--line); border-radius: 9px;
  padding: 8px 12px; font-size: 14px; font-family: inherit;
  transition: border-color .15s, box-shadow .15s; background: #fbfcfe;
}
.panel input:focus, .panel select:focus, .panel textarea:focus {
  outline: none; border-color: var(--brand); box-shadow: 0 0 0 3px rgba(59,102,245,.12); background: #fff;
}
.hint { font-size: 12px; color: var(--faint); margin-top: 7px; line-height: 1.6; }
.hook-result { font-size: 13px; font-weight: 500; }
.hook-result.ok { color: var(--ok); }
.hook-result.bad { color: var(--bad); }
.setup-result { margin-top: 8px; font-size: 12.5px; line-height: 1.9; }
.room-row { display: flex; gap: 8px; align-items: center; padding: 6px 0; border-top: 1px dashed var(--line); flex-wrap: wrap; }
.room-row:first-child { border-top: none; }
.room-id { font-size: 12.5px; color: var(--sub); font-variant-numeric: tabular-nums; min-width: 130px; }
.room-name-display { font-size: 13.5px; font-weight: 600; min-width: 130px; cursor: help; }
.room-count { font-size: 11.5px; color: var(--faint); background: #f1f3f8; border-radius: 10px; padding: 1px 8px; }
.room-name { flex: 1; min-width: 140px; border: 1.5px solid var(--line); border-radius: 8px; padding: 5px 10px; font-size: 13.5px; font-family: inherit; }
.room-name:focus { outline: none; border-color: var(--brand); }
.room-listen { display: inline-flex; align-items: center; gap: 5px; font-size: 13px; font-weight: 600; color: var(--ink); cursor: pointer; flex-shrink: 0; }
.room-listen input[type=checkbox] { width: 16px; height: 16px; accent-color: var(--brand); cursor: pointer; }
.toolbar { display: flex; gap: 8px; margin-bottom: 12px; }
.toolbar input {
  flex: 1; border: 1.5px solid var(--line); border-radius: 10px; padding: 8px 14px;
  font-size: 14px; font-family: inherit; background: var(--card);
}
.toolbar input:focus { outline: none; border-color: var(--brand); box-shadow: 0 0 0 3px rgba(59,102,245,.12); }

/* ---------- 按钮 ---------- */
button.primary {
  background: var(--brand); color: #fff; border: none; border-radius: 9px;
  padding: 8px 18px; font-size: 14px; font-weight: 500; cursor: pointer;
  font-family: inherit; transition: background .15s, transform .1s;
}
button.primary:hover { background: var(--brand-deep); }
button.primary:active { transform: scale(.97); }
button.ghost, .btn-a {
  background: var(--card); color: var(--brand); border: 1.5px solid var(--line-strong);
  border-radius: 9px; padding: 7px 15px; font-size: 14px; cursor: pointer;
  text-decoration: none; display: inline-flex; align-items: center; gap: 5px;
  font-family: inherit; transition: all .15s;
}
button.ghost:hover, .btn-a:hover { border-color: var(--brand); background: var(--brand-weak); }
.mini-btn {
  border: 1px solid var(--line-strong); background: var(--card); border-radius: 7px;
  font-size: 12px; padding: 3px 10px; cursor: pointer; color: var(--sub);
  font-family: inherit; transition: all .12s;
}
.mini-btn:hover { color: var(--brand); border-color: var(--brand); background: var(--brand-weak); }

.row { display: flex; gap: 9px; align-items: center; margin-top: 10px; flex-wrap: wrap; }
.row-add { display: flex; gap: 8px; margin-top: 10px; flex-wrap: wrap; }
.row-add input {
  flex: 1; min-width: 130px; border: 1.5px solid var(--line); border-radius: 9px;
  padding: 8px 12px; font-size: 14px; font-family: inherit; background: #fbfcfe;
}
.row-add input:focus { outline: none; border-color: var(--brand); background: #fff; }
.stu-admin-row {
  display: flex; gap: 10px; align-items: center; padding: 9px 0;
  border-top: 1px dashed var(--line); flex-wrap: wrap; font-size: 14px;
}
.stu-admin-row:first-child { border-top: none; }
.stu-admin-row b { min-width: 60px; }
.stu-admin-row .parents { color: var(--sub); font-size: 13px; flex: 1; }

/* ---------- 空态 ---------- */
.empty { color: var(--faint); text-align: center; padding: 44px 0; font-size: 14px; }
.empty .empty-ic { display: block; font-size: 34px; margin-bottom: 8px; }

/* ---------- 弹层（保留能力） ---------- */
.modal { position: fixed; inset: 0; background: rgba(15,23,42,.45); display: flex; align-items: center; justify-content: center; z-index: 20; padding: 16px; }
.modal[hidden] { display: none; }
.modal-box { background: var(--card); border-radius: var(--r-lg); padding: 20px; max-width: 480px; width: 100%; position: relative; max-height: 80vh; overflow: auto; }

/* ---------- 移动端 ---------- */
@media (max-width: 760px) {
  main { padding: 10px 12px 76px; }
  .topbar { padding: 10px 14px; gap: 10px; }
  .brand-text small { display: none; }
  .conn { display: none; }
  .date-nav { margin-left: auto; }
  .tabs {
    position: fixed; bottom: 0; left: 0; right: 0; z-index: 5;
    background: rgba(255,255,255,.95); backdrop-filter: blur(8px);
    border-top: 1px solid var(--line);
    padding: 6px 8px calc(6px + env(safe-area-inset-bottom));
    gap: 2px;
  }
  .tabs button { flex: 1; padding: 9px 0; border-radius: 9px; font-size: 13px; }
  .tabs button.on { background: var(--brand-weak); }
  .cards { grid-template-columns: 1fr; gap: 12px; }
  .subj-columns { grid-template-columns: 1fr; }
  .students-head { flex-direction: column; }
  .students-actions { width: 100%; }
  .item { padding: 12px 14px; }
  .subj-head { padding: 10px 14px; }
}