/* ============ 班级学情分析工具 样式 ============ */
:root {
  --bg: #F4F6F9;
  --card: #FFFFFF;
  --ink: #1C2B3A;
  --muted: #66788C;
  --primary: #2563A6;
  --primary-deep: #1C4E86;
  --primary-soft: #E9F1FA;
  --accent: #E8833A;
  --accent-soft: #FDF0E4;
  --danger: #C0504D;
  --danger-soft: #FBECEB;
  --ok: #3E8E5A;
  --ok-soft: #E9F4ED;
  --line: #E2E8F0;
  --radius: 10px;
  --shadow: 0 1px 3px rgba(28, 43, 58, .06);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Microsoft YaHei", "PingFang SC", "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  font-size: 14px;
  line-height: 1.55;
}

/* ---------- 顶栏 ---------- */
.topbar {
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 10px 20px;
  background: var(--card);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 20;
}
.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--primary-deep);
  white-space: nowrap;
}
.class-tabs { display: flex; gap: 6px; }
.class-tab {
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--ink);
  padding: 5px 14px;
  border-radius: 999px;
  cursor: pointer;
  font-size: 13px;
}
.class-tab:hover { border-color: var(--primary); color: var(--primary); }
.class-tab.active { background: var(--primary); border-color: var(--primary); color: #fff; }

.rank-toggle {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 3px;
}
.rank-toggle-label {
  font-size: 12px;
  color: var(--muted);
  padding: 0 6px;
}
.rank-toggle label {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 3px 10px;
  border-radius: 999px;
  cursor: pointer;
  font-size: 13px;
  color: var(--muted);
}
.rank-toggle label:has(input:checked) {
  background: var(--card);
  color: var(--primary);
  font-weight: 600;
  box-shadow: var(--shadow);
}
.rank-toggle input { margin: 0; accent-color: var(--primary); }

.header-right {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-left: 4px;
}
.muted { color: var(--muted); font-size: 12px; }

/* ---------- 按钮 ---------- */
.btn {
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--ink);
  padding: 6px 14px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 13px;
  transition: background .15s, border-color .15s;
}
.btn:hover { border-color: var(--primary); color: var(--primary); }
.btn.primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn.primary:hover { background: var(--primary-deep); color: #fff; }
.btn.primary:disabled { background: #B9CCE0; border-color: #B9CCE0; cursor: not-allowed; }
.btn.danger-ghost { color: var(--danger); border-color: #E6C4C2; background: var(--card); }
.btn.danger-ghost:hover { background: var(--danger-soft); color: var(--danger); border-color: var(--danger); }
.btn.ghost { background: transparent; }
.btn.small { padding: 3px 10px; font-size: 12px; }

/* ---------- 视图切换 ---------- */
.views {
  display: flex;
  gap: 4px;
  padding: 10px 20px 0;
}
.view-btn {
  border: none;
  background: transparent;
  color: var(--muted);
  font-size: 14px;
  padding: 8px 16px;
  border-radius: 8px 8px 0 0;
  cursor: pointer;
  border-bottom: 2px solid transparent;
}
.view-btn:hover { color: var(--primary); }
.view-btn.active { color: var(--primary); border-bottom-color: var(--primary); font-weight: 600; }

main { padding: 16px 20px 40px; }
.view { display: none; }
.view.active { display: block; }

/* ---------- 卡片与面板 ---------- */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 12px;
  margin-bottom: 14px;
}
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 12px 14px;
  box-shadow: var(--shadow);
}
.card .label { font-size: 12px; color: var(--muted); }
.card .value { font-size: 24px; font-weight: 700; margin-top: 2px; }
.card .sub { font-size: 12px; color: var(--muted); margin-top: 2px; }
.card .value.up { color: var(--ok); }
.card .value.down { color: var(--danger); }
.card .value.accent { color: var(--accent); }
.card .value.primary { color: var(--primary); }

.panel {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px 16px;
  box-shadow: var(--shadow);
  margin-bottom: 14px;
}
.panel h3 {
  margin: 0 0 10px;
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
}
.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
}
.panel-head h3 { margin: 0; }
.grid2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}
.chart { width: 100%; height: 300px; }

/* ---------- 表格 ---------- */
.table-wrap { overflow-x: auto; }
table.data {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  table-layout: fixed;
}
table.data th, table.data td {
  border-bottom: 1px solid var(--line);
  padding: 6px 8px;
  text-align: center;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
table.data th {
  background: var(--bg);
  font-weight: 600;
  color: var(--ink);
  position: sticky;
  top: 0;
}
table.data tr:hover td { background: #FAFBFD; }
table.data .num { font-variant-numeric: tabular-nums; }
.badge {
  display: inline-block;
  padding: 1px 8px;
  border-radius: 999px;
  font-size: 12px;
}
.badge.good { background: var(--ok-soft); color: var(--ok); }
.badge.bad { background: var(--danger-soft); color: var(--danger); }
.badge.flat { background: var(--bg); color: var(--muted); }

/* ---------- 学生列表 ---------- */
#view-student { display: none; }
#view-student.active { display: grid; grid-template-columns: 260px 1fr; gap: 14px; }
.student-side {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 10px;
  height: fit-content;
  max-height: calc(100vh - 180px);
  display: flex;
  flex-direction: column;
  position: sticky;
  top: 130px;
}
.student-side input {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 7px 10px;
  font-size: 13px;
  margin-bottom: 8px;
  outline: none;
}
.student-side input:focus { border-color: var(--primary); }
.sort-select {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 7px 10px;
  font-size: 13px;
  margin-bottom: 10px;
  background: #fff;
  color: var(--ink);
  outline: none;
}
.sort-select:focus { border-color: var(--primary); }
.student-list { overflow-y: auto; flex: 1; }
.student-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 7px 10px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 13px;
}
.student-item:hover { background: var(--primary-soft); }
.student-item.active { background: var(--primary); color: #fff; }
.student-item .no { color: var(--muted); font-size: 12px; }
.student-item.active .no { color: #DCE8F5; }
.student-item .rank-pill { font-size: 12px; }
.student-item.active .rank-pill { color: #E8F0FA; }

.student-main { min-width: 0; }

/* ---------- 数据管理 ---------- */
.manage-toolbar {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}
.manage-table-wrap { overflow: auto; }
#manageGrid table { min-width: 900px; }
#manageGrid input.cell {
  width: 52px;
  border: 1px solid transparent;
  border-radius: 5px;
  padding: 3px 4px;
  text-align: center;
  font-size: 13px;
  background: transparent;
  color: inherit;
}
#manageGrid input.cell:hover { border-color: var(--line); background: #fff; }
#manageGrid input.cell:focus { border-color: var(--primary); background: #fff; outline: none; }
#manageGrid input.cell.dirty { border-color: var(--accent); background: var(--accent-soft); }
#manageGrid td.absent { color: var(--muted); }
#manageGrid .total-cell { font-weight: 600; }
/* 冻结学号/姓名列：横向滚动时保持可见 */
#manageGrid th.sticky-col, #manageGrid td.sticky-col {
  position: sticky;
  z-index: 1;
  background: var(--card);
  box-shadow: 1px 0 0 var(--line);
}
#manageGrid thead th.sticky-col { z-index: 3; background: var(--bg); }
#manageGrid th.sticky-col.col2, #manageGrid td.sticky-col.col2 { left: 52px; }
#manageGrid tr:hover td.sticky-col { background: var(--card); }
/* 最新一次练习列高亮 */
#manageGrid th.latest-col { background: #FFF4D6; color: #7A5B00; }
#manageGrid td.latest-col { background: #FFFDF3; }
#manageGrid tr:hover td.latest-col { background: #FFF7DE; }

.note {
  font-size: 12px;
  color: var(--muted);
  background: var(--primary-soft);
  border-radius: 8px;
  padding: 8px 12px;
  margin-top: 10px;
}

/* ---------- 弹窗 ---------- */
.modal[hidden] { display: none; }
.modal {
  position: fixed;
  inset: 0;
  background: rgba(28, 43, 58, .45);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
}
.modal-box {
  background: var(--card);
  border-radius: 12px;
  width: min(680px, 92vw);
  max-height: 86vh;
  overflow: auto;
  padding: 18px 20px;
  box-shadow: 0 12px 40px rgba(28, 43, 58, .2);
}
.modal-box h2 { margin: 0 0 12px; font-size: 16px; }
.modal-box .form-row {
  display: flex;
  gap: 10px;
  align-items: center;
  margin-bottom: 10px;
  flex-wrap: wrap;
}
.modal-box input[type="text"], .modal-box input[type="number"], .modal-box select {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 7px 10px;
  font-size: 13px;
  outline: none;
}
.modal-box input:focus { border-color: var(--primary); }
.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 14px;
}
.modal .hint { font-size: 12px; color: var(--muted); }
.quiz-input-table { max-height: 46vh; overflow: auto; border: 1px solid var(--line); border-radius: 8px; }
.modal-box h3 { margin: 0 0 12px; font-size: 16px; }
.form-row label { width: 72px; flex: none; color: var(--text); font-size: 13px; }
.form-row select, .form-row input { flex: 1; min-width: 200px; }
.chk-group { flex: 1; display: flex; flex-wrap: wrap; gap: 4px 18px; min-width: 200px; }
.chk-group .chk { width: auto; flex: none; font-size: 13px; display: inline-flex; align-items: center; gap: 4px; cursor: pointer; }
.chk-group .chk input { min-width: 0; width: auto; margin: 0; }
.export-warn { margin: 10px 0; font-size: 13px; }
.export-warn .warn-item { color: #9A6B00; background: #FDF3D7; border: 1px solid #EBD9A8; border-radius: 6px; padding: 6px 10px; margin-bottom: 6px; }
.export-warn .ok-item { color: #3E8E5A; background: #EAF5EE; border: 1px solid #C4E2CD; border-radius: 6px; padding: 6px 10px; }
.check-row { display: flex; gap: 8px; align-items: flex-start; font-size: 13px; color: var(--text); margin-top: 6px; cursor: pointer; }
.check-row input { margin-top: 2px; }
.trend-quiz-box { flex: 1; display: flex; flex-direction: column; gap: 4px; align-items: flex-start; }
.tq-item { font-size: 13px; color: var(--text); cursor: pointer; white-space: nowrap; display: flex; align-items: center; gap: 6px; }
.tq-item input { margin: 0; }
.tq-item:has(input:disabled) { color: #888; }
.cal-status { background: var(--bg-soft); border: 1px solid var(--line); border-radius: 8px; padding: 10px 12px; font-size: 13px; line-height: 1.8; margin-bottom: 10px; }
.cal-table-wrap { max-height: 46vh; overflow: auto; border: 1px solid var(--line); border-radius: 8px; margin-bottom: 10px; }
.cal-table { width: 100%; border-collapse: collapse; font-size: 12px; }
.cal-table th, .cal-table td { border: 1px solid var(--line); padding: 3px 4px; text-align: center; white-space: nowrap; }
.cal-table th { background: var(--bg-soft); font-weight: 600; position: sticky; top: 0; }
.cal-table td.cal-week { font-weight: 600; background: #F7F9FB; }
.cal-table td.cal-day { color: var(--text); }
.cal-table td.cal-holiday { color: #C0392B; background: #FDECEA; font-weight: 600; }
.cal-table td.cal-weekend { background: #F5F6F8; color: #7A8699; }
.cal-table td.cal-note { color: #C0392B; text-align: left; font-size: 11px; line-height: 1.4; }
.cal-special { font-size: 12px; color: #8A4B08; background: #FDF6E8; border: 1px solid #EFD9A7; border-radius: 6px; padding: 7px 10px; line-height: 1.8; margin-bottom: 10px; }
.student-toolbar { margin-bottom: 10px; display: flex; justify-content: flex-end; }

/* ---------- Toast ---------- */
.toast {
  position: fixed;
  left: 50%;
  bottom: 30px;
  transform: translateX(-50%);
  background: var(--ink);
  color: #fff;
  padding: 10px 18px;
  border-radius: 999px;
  font-size: 13px;
  z-index: 200;
  box-shadow: 0 6px 20px rgba(28, 43, 58, .3);
  max-width: 80vw;
}
.toast.error { background: var(--danger); }
.toast.ok { background: var(--ok); }

/* ---------- 数据提示 ---------- */
.anomaly-item {
  font-size: 13px;
  padding: 5px 0;
  border-bottom: 1px dashed var(--line);
  color: var(--muted);
}
.anomaly-item b { color: var(--ink); }

/* ---------- 空态 ---------- */
.empty {
  text-align: center;
  color: var(--muted);
  padding: 40px 0;
  font-size: 13px;
}

/* ---------- 响应式 ---------- */
@media (max-width: 1100px) {
  .grid2 { grid-template-columns: 1fr; }
  #view-student.active { grid-template-columns: 210px 1fr; }
}
@media (max-width: 820px) {
  .topbar { flex-wrap: wrap; gap: 8px; }
  .rank-toggle { margin-left: 0; }
  #view-student.active { grid-template-columns: 1fr; }
  .student-side { position: static; max-height: 240px; }
}

/* ---------- 访问密码面板 ---------- */
.auth-overlay {
  position: fixed;
  inset: 0;
  background: linear-gradient(160deg, #EAF1F9 0%, #DCE7F3 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 300;
}
.auth-overlay[hidden] { display: none; }
.auth-box {
  background: var(--card);
  border-radius: 16px;
  width: min(420px, 90vw);
  padding: 32px 34px 26px;
  text-align: center;
  box-shadow: 0 16px 48px rgba(28, 43, 58, .18);
}
.auth-icon { margin-bottom: 10px; }
.auth-box h2 { margin: 0 0 6px; font-size: 19px; color: var(--primary-deep); }
.auth-desc { margin: 0 0 18px; font-size: 13px; color: var(--muted); line-height: 1.7; }
.auth-form { display: flex; flex-direction: column; gap: 10px; }
.auth-form input {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 11px 14px;
  font-size: 14px;
  outline: none;
  text-align: center;
}
.auth-form input:focus { border-color: var(--primary); }
.auth-form .wide { width: 100%; padding: 11px 0; font-size: 14px; }
.auth-msg { min-height: 18px; margin: 12px 0 0; font-size: 13px; color: var(--ok); }
.auth-msg.err { color: var(--danger); }
.auth-tip { margin: 14px 0 0; font-size: 12px; color: #9AA7B5; line-height: 1.6; }

/* ---------- 设备管理 ---------- */
.dev-list { margin: 4px 0 14px; border: 1px solid var(--line); border-radius: 10px; overflow: hidden; }
.dev-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--line);
  background: var(--card);
}
.dev-row:last-child { border-bottom: none; }
.dev-label { font-size: 13px; font-weight: 600; }
.dev-meta { font-size: 12px; color: var(--muted); margin-top: 2px; }
.dev-actions { flex: none; display: flex; align-items: center; gap: 8px; }
.tag-owner {
  font-size: 12px;
  color: #fff;
  background: var(--primary);
  border-radius: 999px;
  padding: 3px 10px;
}
.dot-online {
  display: inline-block;
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--ok);
  margin-right: 2px;
}
.btn.danger-ghost.small { font-size: 12px; padding: 3px 10px; }