/* ===== 教师题库管理后台 v6 · 共享样式 ===== */
:root {
  --primary: #4F46E5;
  --primary-dark: #4338CA;
  --primary-light: #E6F4F2;
  --bg: #F6F8FA;
  --card: #FFFFFF;
  --border: #E5E9EE;
  --text: #1F2933;
  --text-soft: #52606D;
  --text-muted: #9AA5B1;
  --ok: #10B981;
  --warn: #F59E0B;
  --danger: #EF4444;
  --ok-bg: #E7F7F0;
  --warn-bg: #FEF3E2;
  --danger-bg: #FDECEC;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(16, 24, 40, .06), 0 1px 2px rgba(16, 24, 40, .04);
  --shadow-lg: 0 8px 30px rgba(16, 24, 40, .12);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  font-family: "PingFang SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ===== 导航栏 ===== */
.topnav {
  background: var(--card);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 50;
}
.topnav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  height: 60px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.topnav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 17px;
  color: var(--primary);
  margin-right: 24px;
  white-space: nowrap;
}
.topnav-brand .logo {
  width: 30px; height: 30px;
  background: var(--primary);
  color: #fff;
  border-radius: 8px;
  display: grid;
  place-items: center;
  font-size: 15px;
  font-weight: 700;
}
.topnav-links {
  display: flex;
  gap: 4px;
  flex: 1;
  min-width: 0;
  overflow-x: auto;
  overflow-y: hidden;
  white-space: nowrap;
  scrollbar-width: thin;
}
.topnav-links a {
  flex: 0 0 auto;
  white-space: nowrap;
  padding: 8px 14px;
  border-radius: 8px;
  color: var(--text-soft);
  font-weight: 500;
  transition: all .15s;
}
.topnav-links a:hover { background: var(--bg); text-decoration: none; color: var(--text); }
.topnav-links a.active { background: var(--primary-light); color: var(--primary); }
.topnav-user { display: flex; align-items: center; gap: 12px; color: var(--text-soft); }
.topnav-user .uname { font-weight: 600; color: var(--text); }

/* ===== 页面容器 ===== */
.page {
  max-width: 1200px;
  margin: 0 auto;
  padding: 28px 24px 60px;
}
.page-head { margin-bottom: 22px; }
.page-head h1 { margin: 0 0 4px; font-size: 22px; font-weight: 700; }
.page-head p { margin: 0; color: var(--text-muted); }

/* ===== 卡片 ===== */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
}
.card-title {
  font-size: 15px;
  font-weight: 700;
  margin: 0 0 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.card-title .bar { width: 4px; height: 15px; background: var(--primary); border-radius: 2px; }

/* ===== KPI ===== */
.kpi-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}
.kpi {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 18px 20px;
  position: relative;
  overflow: hidden;
}
.kpi::before {
  content: "";
  position: absolute; left: 0; top: 0; bottom: 0;
  width: 4px; background: var(--primary);
}
.kpi .kpi-label { color: var(--text-muted); font-size: 13px; margin-bottom: 6px; }
.kpi .kpi-value { font-size: 28px; font-weight: 700; line-height: 1.1; }
.kpi .kpi-sub { font-size: 12px; color: var(--text-muted); margin-top: 4px; }
.kpi.is-ok::before { background: var(--ok); }
.kpi.is-warn::before { background: var(--warn); }
.kpi.is-danger::before { background: var(--danger); }
.kpi.is-ok .kpi-value { color: var(--ok); }
.kpi.is-warn .kpi-value { color: var(--warn); }
.kpi.is-danger .kpi-value { color: var(--danger); }

/* ===== 科目卡片 ===== */
.subject-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
}
.subject-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 16px 18px;
}
.subject-card .s-name { font-weight: 700; font-size: 15px; margin-bottom: 2px; }
.subject-card .s-now { font-size: 22px; font-weight: 700; color: var(--primary); }
.subject-card .s-gap { font-size: 12px; color: var(--warn); margin-left: 6px; }

/* ===== 进度条 ===== */
.progress {
  height: 8px;
  background: #EDF1F5;
  border-radius: 6px;
  overflow: hidden;
  margin-top: 8px;
}
.progress > span {
  display: block;
  height: 100%;
  background: var(--primary);
  border-radius: 6px;
  transition: width .4s ease;
}
.progress.is-ok > span { background: var(--ok); }
.progress.is-warn > span { background: var(--warn); }
.progress.is-danger > span { background: var(--danger); }

/* ===== 徽标 ===== */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 10px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
  line-height: 1.6;
  white-space: nowrap;
}
.badge.ok { background: var(--ok-bg); color: var(--ok); }
.badge.warn { background: var(--warn-bg); color: var(--warn); }
.badge.danger { background: var(--danger-bg); color: var(--danger); }
.badge.info { background: var(--primary-light); color: var(--primary); }
.badge.gray { background: #EEF1F4; color: var(--text-soft); }
.badge .dot { width: 6px; height: 6px; border-radius: 50%; background: currentColor; }

/* ===== 表格 ===== */
.table-wrap { overflow-x: auto; }
table.data {
  width: 100%;
  border-collapse: collapse;
  font-size: 13.5px;
}
table.data th, table.data td {
  padding: 11px 12px;
  text-align: left;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}
table.data th {
  background: #FAFBFC;
  color: var(--text-soft);
  font-weight: 600;
  font-size: 12.5px;
  white-space: nowrap;
}
table.data tbody tr:hover { background: #FAFBFC; }
table.data td.num { font-variant-numeric: tabular-nums; }
tr.row-review { background: #FFFBF2; }
tr.row-review:hover { background: #FEF6E6; }

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  font-size: 13.5px;
  font-weight: 600;
  cursor: pointer;
  transition: all .15s;
  font-family: inherit;
  white-space: nowrap;
}
.btn:hover { border-color: #CBD2D9; background: #FAFBFC; }
.btn.primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn.primary:hover { background: var(--primary-dark); border-color: var(--primary-dark); }
.btn.danger { background: var(--danger); border-color: var(--danger); color: #fff; }
.btn.danger:hover { background: #DC3535; }
.btn.ghost { background: transparent; border-color: transparent; color: var(--primary); padding: 6px 10px; }
.btn.ghost:hover { background: var(--primary-light); }
.btn.sm { padding: 5px 11px; font-size: 12.5px; }
.btn:disabled { opacity: .5; cursor: not-allowed; }

/* ===== 表单 ===== */
.field { margin-bottom: 16px; }
.field label { display: block; font-weight: 600; margin-bottom: 6px; font-size: 13px; color: var(--text-soft); }
input[type=text], input[type=password], input[type=number], select, textarea {
  width: 100%;
  padding: 9px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
  font-family: inherit;
  color: var(--text);
  background: #fff;
  transition: border-color .15s, box-shadow .15s;
}
input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(13, 148, 136, .12);
}
textarea { resize: vertical; min-height: 80px; line-height: 1.6; }
select { cursor: pointer; }

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: flex-end;
}
.filter-bar .field { margin-bottom: 0; min-width: 150px; }
.filter-bar .field.grow { flex: 1; min-width: 200px; }

/* ===== Modal 弹层 ===== */
.modal-mask {
  position: fixed; inset: 0;
  background: rgba(16, 24, 40, .45);
  display: none;
  align-items: flex-start;
  justify-content: center;
  padding: 40px 16px;
  z-index: 100;
  overflow-y: auto;
}
.modal-mask.show { display: flex; }
.modal {
  background: var(--card);
  border-radius: 14px;
  box-shadow: var(--shadow-lg);
  width: 100%;
  max-width: 640px;
  margin: auto 0;
}
.modal-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 22px;
  border-bottom: 1px solid var(--border);
}
.modal-head h3 { margin: 0; font-size: 16px; }
.modal-close {
  border: none; background: transparent; cursor: pointer;
  font-size: 22px; color: var(--text-muted); line-height: 1;
  width: 32px; height: 32px; border-radius: 8px;
}
.modal-close:hover { background: var(--bg); color: var(--text); }
.modal-body { padding: 22px; max-height: 65vh; overflow-y: auto; }
.modal-foot {
  display: flex; justify-content: flex-end; gap: 10px;
  padding: 16px 22px;
  border-top: 1px solid var(--border);
}
.opt-row { display: flex; align-items: center; gap: 8px; margin-bottom: 8px; }
.opt-row .opt-key {
  width: 30px; height: 30px; flex: none;
  display: grid; place-items: center;
  background: var(--primary-light); color: var(--primary);
  border-radius: 8px; font-weight: 700;
}

/* ===== 分页 ===== */
.pager {
  display: flex; align-items: center; justify-content: space-between;
  margin-top: 16px; gap: 12px; flex-wrap: wrap;
}
.pager .p-info { color: var(--text-muted); font-size: 13px; }
.pager .p-ctrl { display: flex; align-items: center; gap: 8px; }
.pager .p-page { font-weight: 600; padding: 0 6px; }

/* ===== 树 ===== */
.tree { list-style: none; margin: 0; padding: 0; }
.tree .node { }
.tree .node-row {
  display: flex; align-items: center; gap: 8px;
  padding: 9px 12px;
  border-radius: 8px;
  cursor: default;
}
.tree .node-row:hover { background: #FAFBFC; }
.tree .toggle {
  width: 20px; height: 20px; flex: none;
  display: grid; place-items: center;
  cursor: pointer; color: var(--text-muted);
  transition: transform .15s;
  user-select: none;
  font-size: 11px;
}
.tree .toggle.open { transform: rotate(90deg); }
.tree .toggle.leaf { visibility: hidden; }
.tree .node-label { font-weight: 500; }
.tree .node-label .no { color: var(--text-muted); margin-right: 6px; font-variant-numeric: tabular-nums; }
.tree .lvl-subject > .node-row > .node-label { font-weight: 700; font-size: 15px; }
.tree .lvl-chapter > .node-row > .node-label { font-weight: 600; }
.tree .count-pill {
  margin-left: auto;
  font-size: 12px; font-weight: 600;
  color: var(--text-soft);
  background: var(--bg);
  padding: 1px 9px; border-radius: 20px;
}
.tree .count-pill.zero { color: var(--danger); background: var(--danger-bg); }
.tree .go-link { margin-left: 10px; font-size: 12px; opacity: 0; transition: opacity .15s; }
.tree .node-row:hover .go-link { opacity: 1; }
.tree .children { list-style: none; margin: 0; padding-left: 26px; display: none; }
.tree .children.open { display: block; }

/* ===== 提示/空态 ===== */
.empty { text-align: center; padding: 48px 16px; color: var(--text-muted); }
.empty .big { font-size: 15px; margin-bottom: 4px; }
.loading { text-align: center; padding: 40px; color: var(--text-muted); }
.alert {
  padding: 11px 14px; border-radius: 8px; font-size: 13.5px; margin-bottom: 14px;
}
.alert.err { background: var(--danger-bg); color: var(--danger); }
.alert.ok { background: var(--ok-bg); color: var(--ok); }
.alert.info { background: var(--primary-light); color: var(--primary-dark); }

/* ===== Toast ===== */
#toast-wrap {
  position: fixed; top: 20px; right: 20px; z-index: 200;
  display: flex; flex-direction: column; gap: 10px;
}
.toast {
  background: var(--text); color: #fff;
  padding: 11px 18px; border-radius: 10px;
  box-shadow: var(--shadow-lg);
  font-size: 13.5px; font-weight: 500;
  animation: toast-in .2s ease;
  max-width: 320px;
}
.toast.ok { background: #4338CA; }
.toast.err { background: #DC3535; }
@keyframes toast-in { from { opacity: 0; transform: translateY(-8px); } to { opacity: 1; transform: none; } }

/* ===== 登录页 ===== */
.login-wrap {
  min-height: 100vh;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, #4F46E5 0%, #4338CA 100%);
  padding: 20px;
}
.login-card {
  background: #fff;
  border-radius: 16px;
  box-shadow: var(--shadow-lg);
  width: 100%;
  max-width: 380px;
  padding: 36px 32px;
}
.login-card .brand {
  display: flex; flex-direction: column; align-items: center;
  margin-bottom: 26px; text-align: center;
}
.login-card .brand .logo {
  width: 54px; height: 54px;
  background: var(--primary); color: #fff;
  border-radius: 14px; display: grid; place-items: center;
  font-size: 26px; font-weight: 700; margin-bottom: 12px;
}
.login-card .brand h1 { margin: 0; font-size: 20px; }
.login-card .brand p { margin: 4px 0 0; color: var(--text-muted); font-size: 13px; }
.login-card .btn { width: 100%; padding: 11px; margin-top: 6px; }

/* ===== 说明列表 ===== */
.help-list { margin: 0; padding-left: 20px; color: var(--text-soft); }
.help-list li { margin-bottom: 6px; }
.code-cols {
  display: flex; flex-wrap: wrap; gap: 8px; margin-top: 6px;
}
.code-cols .col {
  background: var(--bg); border: 1px solid var(--border);
  padding: 5px 12px; border-radius: 8px; font-size: 12.5px; font-weight: 600;
}
.mono { font-family: "SFMono-Regular", Consolas, monospace; font-size: 12.5px; }

.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.muted { color: var(--text-muted); }
.text-danger { color: var(--danger); }
.flex-between { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.checkbox-cell { width: 36px; text-align: center; }
.stem-cell { max-width: 420px; }
.truncate { overflow: hidden; text-overflow: ellipsis; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; }
.bulkbar {
  display: flex; align-items: center; gap: 12px;
  padding: 10px 14px; background: var(--primary-light);
  border-radius: 10px; margin-bottom: 14px;
}
.bulkbar .cnt { font-weight: 700; color: var(--primary); }