/* ============================================================
   课堂测评与反馈系统 · 全局样式
   移动优先（学生多用手机作答），桌面端两栏/多栏布局
   与 onlinehomework 项目保持同一套视觉语言，便于统一运维
   ============================================================ */

:root {
  --blue: #2563eb;
  --blue-dark: #1d4ed8;
  --blue-soft: #eff6ff;
  --green: #16a34a;
  --green-soft: #dcfce7;
  --amber: #d97706;
  --amber-soft: #fef3c7;
  --red: #dc2626;
  --red-soft: #fee2e2;
  --violet: #7c3aed;
  --violet-soft: #f5f3ff;
  --ink: #0f172a;
  --ink-2: #334155;
  --muted: #64748b;
  --line: #e2e8f0;
  --bg: #f1f5f9;
  --card: #ffffff;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(15, 23, 42, .06), 0 8px 24px -12px rgba(15, 23, 42, .12);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }

body {
  font-family: "Microsoft YaHei", "PingFang SC", "Hiragino Sans GB", system-ui, -apple-system, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--ink);
  font-size: 15px;
  line-height: 1.6;
  -webkit-text-size-adjust: 100%;
}

a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }
code {
  background: #f1f5f9; padding: 1px 5px; border-radius: 4px;
  font-family: Consolas, "Courier New", monospace; font-size: .9em;
}
pre.code-block {
  background: #0f172a; color: #e2e8f0; padding: 14px; border-radius: 10px;
  overflow-x: auto; font-size: .8rem; line-height: 1.6; white-space: pre-wrap; word-break: break-all;
}
h1, h2, h3, h4 { margin: 0 0 12px; line-height: 1.35; }
h1 { font-size: 1.5rem; }
h2 { font-size: 1.15rem; }
h3 { font-size: 1rem; }
p { margin: 0 0 10px; }
hr.divider { border: 0; border-top: 1px solid var(--line); margin: 18px 0; }

.muted { color: var(--muted); }
.small { font-size: .85rem; }
.req { color: var(--red); }
.ok-text { color: var(--green); }
.warn { color: var(--amber); }
.error-text { color: var(--red); }
.lead { font-size: 1.02rem; }

/* ---------------- 顶栏 ---------------- */
.topbar {
  background: #fff; border-bottom: 1px solid var(--line);
  position: sticky; top: 0; z-index: 30;
}
.topbar-inner {
  max-width: 1220px; margin: 0 auto; padding: 10px 16px;
  display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap;
}
.brand { display: flex; align-items: center; gap: 9px; color: var(--ink); font-weight: 700; }
.brand:hover { text-decoration: none; }
.brand-mark {
  width: 30px; height: 30px; border-radius: 8px; background: var(--blue); color: #fff;
  display: grid; place-items: center; font-size: .82rem;
}
.brand-text { font-size: .98rem; }
.nav { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; }
.nav a { color: var(--ink-2); font-size: .92rem; }
.nav a:hover { color: var(--blue); text-decoration: none; }
.nav-user { font-size: .88rem; color: var(--muted); }
.nav-cta {
  background: var(--blue); color: #fff !important; padding: 6px 14px; border-radius: 999px; font-size: .88rem;
}
.nav-cta:hover { background: var(--blue-dark); }

/* ---------------- 布局 ---------------- */
.container { max-width: 1220px; margin: 0 auto; padding: 20px 16px 56px; }
.grid-2 { display: grid; grid-template-columns: 1fr; gap: 18px; }
@media (min-width: 940px) {
  .grid-2 { grid-template-columns: 1.1fr .9fr; }
  .grid-2 > .card, .grid-2 > div > .card:last-child { margin-bottom: 18px; }
}
.page-head {
  display: flex; justify-content: space-between; align-items: flex-start;
  gap: 12px; flex-wrap: wrap; margin-bottom: 16px;
}
.page-head h1 { margin-bottom: 4px; }
.sticky-head { position: sticky; top: 52px; background: var(--bg); z-index: 10; padding: 10px 0; }

/* ---------------- 卡片 ---------------- */
.card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 20px; margin-bottom: 18px;
}
.card > h2:first-child { margin-top: 0; }
.center-card { max-width: 560px; margin: 24px auto; }
.login-card { max-width: 400px; text-align: left; }
.hero { text-align: center; }
.error-code { font-size: 3.2rem; font-weight: 800; color: var(--blue); line-height: 1; margin-bottom: 8px; }
.ai-card { border-color: #ddd6fe; background: linear-gradient(180deg, #faf9ff, #fff); }
.danger-zone { border-color: #fecaca; }
.qr { width: 100%; max-width: 220px; height: auto; }

/* ---------------- 表单 ---------------- */
.form-item { margin-bottom: 15px; }
.form-item label {
  display: block; margin-bottom: 6px; font-size: .88rem; color: var(--ink-2); font-weight: 600;
}
input[type="text"], input[type="password"], input[type="number"], input[type="datetime-local"],
input[type="file"], select, textarea {
  width: 100%; padding: 10px 12px; border: 1px solid #cbd5e1; border-radius: 8px;
  font-size: .95rem; font-family: inherit; background: #fff; color: var(--ink);
}
input:focus, select:focus, textarea:focus {
  outline: none; border-color: var(--blue); box-shadow: 0 0 0 3px rgba(37, 99, 235, .12);
}
input[type="file"] { padding: 8px; background: #f8fafc; }
textarea { resize: vertical; line-height: 1.65; }
.form-row { display: grid; grid-template-columns: 1fr; gap: 0 14px; }
@media (min-width: 660px) { .form-row { grid-template-columns: 1fr 1fr; } }
.inline-form { display: flex; gap: 10px; flex-wrap: wrap; align-items: flex-end; }
.inline-form input, .inline-form select { flex: 1 1 180px; }
.hint { font-size: .82rem; color: var(--muted); margin: 6px 0 0; }
.hint.warn, .hint.warning { color: var(--amber); }
.checkbox-list {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(210px, 1fr));
  gap: 6px 14px; max-height: 240px; overflow: auto;
  border: 1px solid var(--line); border-radius: 8px; padding: 10px 12px; background: #f8fafc;
}
.checkbox { display: flex; align-items: center; gap: 8px; font-size: .9rem; font-weight: 400; cursor: pointer; }
.checkbox input { width: auto; }
.checkbox.inline { display: inline-flex; margin-right: 14px; }
.filter-bar { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
.filter-bar select, .filter-bar input { flex: 1 1 160px; }
.join-form { text-align: left; margin-top: 18px; }
.score-input { max-width: 90px; }

/* ---------------- 按钮 ---------------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 10px 18px; border: 1px solid transparent; border-radius: 8px;
  font-size: .92rem; font-family: inherit; font-weight: 600; cursor: pointer;
  background: #e2e8f0; color: var(--ink);
  transition: background .15s, box-shadow .15s, opacity .15s;
}
.btn:hover { text-decoration: none; background: #cbd5e1; }
.btn-primary { background: var(--blue); color: #fff; }
.btn-primary:hover { background: var(--blue-dark); }
.btn-ghost { background: #fff; border-color: #cbd5e1; color: var(--ink-2); }
.btn-ghost:hover { background: #f8fafc; }
.btn-danger { background: var(--red); color: #fff; }
.btn-danger:hover { background: #b91c1c; }
.btn-small { padding: 5px 11px; font-size: .82rem; }
.btn-block { width: 100%; }
.btn:disabled { opacity: .55; cursor: not-allowed; }
.actions { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.actions-cell { display: flex; gap: 6px; flex-wrap: wrap; align-items: center; }
form.inline { display: inline; }

/* ---------------- 提示 ---------------- */
.flashes { margin-bottom: 16px; }
.alert {
  padding: 12px 16px; border-radius: 8px; margin-bottom: 10px;
  font-size: .92rem; border: 1px solid transparent;
}
.alert-success { background: var(--green-soft); color: #14532d; border-color: #bbf7d0; }
.alert-error { background: var(--red-soft); color: #7f1d1d; border-color: #fecaca; }
.alert-warning { background: var(--amber-soft); color: #78350f; border-color: #fde68a; }
.alert-info { background: var(--blue-soft); color: #1e3a8a; border-color: #bfdbfe; }

/* ---------------- 徽章 / 标签 ---------------- */
.badge {
  display: inline-block; padding: 2px 9px; border-radius: 999px;
  font-size: .78rem; font-weight: 600; white-space: nowrap;
}
.badge-ok { background: var(--green-soft); color: #14532d; }
.badge-warn { background: var(--amber-soft); color: #78350f; }
.badge-muted { background: #e2e8f0; color: var(--ink-2); }
.badge-soft { background: var(--blue-soft); color: #1e3a8a; }
.tag {
  display: inline-block; padding: 0 7px; border-radius: 4px; font-size: .74rem; font-weight: 600; margin-left: 4px;
}
.tag-ok { background: var(--green-soft); color: #14532d; }
.tag-mine { background: var(--blue-soft); color: #1e3a8a; }
.chip {
  background: #f1f5f9; border: 1px solid var(--line); border-radius: 999px;
  padding: 2px 10px; font-size: .78rem; display: inline-block;
}
.chip-warn { background: var(--amber-soft); border-color: #fde68a; color: #78350f; }
.chip-row { display: flex; flex-wrap: wrap; gap: 6px; padding: 4px 0; }

/* ---------------- 表格 ---------------- */
.table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; }
.data-table { width: 100%; border-collapse: collapse; font-size: .9rem; }
.data-table th, .data-table td {
  padding: 9px 12px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top;
}
.data-table th {
  background: #f8fafc; font-size: .82rem; color: var(--ink-2); font-weight: 700; white-space: nowrap;
}
.data-table tbody tr:hover { background: #f8fafc; }
.data-table.compact th, .data-table.compact td { padding: 6px 10px; font-size: .82rem; }
.row-muted { opacity: .6; }
.row-warn { background: #fffbeb; }

@media (max-width: 720px) {
  .data-table thead { display: none; }
  .data-table, .data-table tbody, .data-table tr, .data-table td { display: block; width: 100%; }
  .data-table tr {
    border: 1px solid var(--line); border-radius: 10px; margin-bottom: 10px;
    padding: 8px 10px; background: #fff;
  }
  .data-table td { border: 0; padding: 3px 0; display: flex; gap: 8px; }
  .data-table td::before {
    content: attr(data-label); flex: 0 0 78px; color: var(--muted); font-size: .8rem;
  }
}

/* ---------------- 统计 / 进度 ---------------- */
.stat-row {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(118px, 1fr));
  gap: 12px; margin-bottom: 18px;
}
.stat {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 14px; text-align: center; box-shadow: var(--shadow);
}
.stat-value { font-size: 1.35rem; font-weight: 800; color: var(--ink); }
.stat-value.ok { color: var(--green); }
.stat-value.warn { color: var(--amber); }
.stat-label { font-size: .78rem; color: var(--muted); margin-top: 2px; }

.progress {
  height: 7px; background: #e2e8f0; border-radius: 999px; overflow: hidden;
  margin-bottom: 4px; min-width: 80px;
}
.progress-bar { height: 100%; background: var(--blue); border-radius: 999px; }
.progress-bar.bar-warn { background: var(--amber); }
.progress-bar.bar-ok { background: var(--green); }

.bar-mini { height: 6px; background: #e2e8f0; border-radius: 999px; overflow: hidden; margin-bottom: 3px; }
.bar-mini span { display: block; height: 100%; background: var(--green); }
.bar-mini-blue span { background: var(--blue); }
.bar-mini-red span { background: var(--red); }

.band-row { display: flex; align-items: center; gap: 10px; margin-bottom: 8px; }
.band-label { flex: 0 0 130px; font-size: .85rem; }
.band-count { flex: 0 0 auto; font-size: .8rem; color: var(--muted); display: flex; gap: 6px; align-items: center; }
.band-row .progress { flex: 1 1 auto; margin-bottom: 0; }

/* ---------------- 任务卡 ---------------- */
.task-cards { display: grid; grid-template-columns: 1fr; gap: 14px; }
@media (min-width: 900px) { .task-cards { grid-template-columns: 1fr 1fr; } }
.task-card {
  border: 1px solid var(--line); border-radius: 10px; padding: 14px; background: #fff;
}
.task-card-retake { border-color: #fde68a; background: #fffdf5; }
.task-card-head { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin-bottom: 6px; }
.task-card-head h3 { margin: 0; font-size: 1.02rem; }
.task-meta { display: flex; flex-wrap: wrap; gap: 10px; font-size: .82rem; color: var(--muted); margin-bottom: 10px; }
.task-actions { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.class-card { padding: 16px; margin-bottom: 0; }
.class-actions { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; margin: 8px 0; }
.task-list { list-style: none; padding: 0; margin: 0; }
.task-list li { padding: 9px 0; border-bottom: 1px dashed var(--line); }
.task-list li:last-child { border-bottom: 0; }
.task-line { display: flex; justify-content: space-between; gap: 10px; align-items: center; }

/* ---------------- 作答页 ---------------- */
.practice-page .container { padding-bottom: 120px; }
.question-card { position: relative; }
.question-card.answered { border-left: 4px solid var(--green); }
.q-head {
  display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
  margin-bottom: 10px; padding-bottom: 8px; border-bottom: 1px dashed var(--line);
}
.q-index { font-weight: 700; color: var(--blue); font-size: .9rem; }
.q-kp { font-size: .78rem; color: var(--muted); }
.q-stem { font-size: 1rem; line-height: 1.75; white-space: pre-wrap; margin-bottom: 12px; }
.q-stem-images { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 12px; }
.q-stem-images img { max-width: 100%; max-height: 320px; border-radius: 8px; border: 1px solid var(--line); }
.q-status { min-height: 18px; margin-top: 8px; }

.options { display: flex; flex-direction: column; gap: 8px; }
.option {
  display: flex; align-items: flex-start; gap: 10px; padding: 11px 13px;
  border: 1px solid var(--line); border-radius: 9px; cursor: pointer; background: #fff;
  transition: border-color .12s, background .12s;
}
.option:hover { border-color: var(--blue); background: var(--blue-soft); }
.option input { width: auto; margin-top: 4px; flex: 0 0 auto; }
.option-key {
  flex: 0 0 24px; height: 24px; border-radius: 6px; background: #e2e8f0;
  display: grid; place-items: center; font-weight: 700; font-size: .82rem;
}
.option:has(input:checked) { border-color: var(--blue); background: var(--blue-soft); }
.option:has(input:checked) .option-key { background: var(--blue); color: #fff; }
.option-text { flex: 1 1 auto; }

.option-review { list-style: none; padding: 0; margin: 0 0 12px; }
.option-review li {
  display: flex; align-items: flex-start; gap: 8px; padding: 7px 10px;
  border: 1px solid var(--line); border-radius: 8px; margin-bottom: 6px; font-size: .9rem;
}
.option-review li.is-correct { border-color: #bbf7d0; background: var(--green-soft); }
.option-review li.is-mine { outline: 2px solid var(--blue); outline-offset: -2px; }

.thumb-row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 8px; }
.thumb {
  position: relative; width: 108px; height: 108px; border-radius: 8px; overflow: hidden;
  border: 1px solid var(--line); background: #f8fafc; display: block;
}
.thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }
.thumb-del {
  position: absolute; top: 2px; right: 2px; width: 22px; height: 22px; border-radius: 50%;
  border: 0; background: rgba(15, 23, 42, .7); color: #fff; cursor: pointer; font-size: .9rem; line-height: 1;
}

.submit-bar {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 25;
  background: #fff; border-top: 1px solid var(--line);
  box-shadow: 0 -4px 16px -8px rgba(15, 23, 42, .25);
}
.submit-bar-inner {
  max-width: 1220px; margin: 0 auto; padding: 10px 16px;
  display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap;
}
.submit-info { display: flex; flex-direction: column; gap: 2px; }
.timer {
  font-family: Consolas, monospace; font-size: 1.1rem; font-weight: 700;
  background: var(--blue-soft); color: var(--blue-dark); padding: 4px 12px; border-radius: 8px;
}
.timer-danger { background: var(--red-soft); color: #7f1d1d; }
.progress-pill {
  background: #f1f5f9; border: 1px solid var(--line); border-radius: 999px;
  padding: 4px 12px; font-size: .84rem; color: var(--ink-2);
}

/* ---------------- 结果页 ---------------- */
.result-item {
  border: 1px solid var(--line); border-radius: 10px; padding: 14px; margin-bottom: 14px;
}
.result-item.correct { border-left: 4px solid var(--green); }
.result-item.wrong { border-left: 4px solid var(--amber); }

/* 一题一格，答对的默认折起来：75 题的卷子不用一路滚到底 */
.result-item > summary { cursor: pointer; list-style: none; }
.result-item > summary::-webkit-details-marker { display: none; }
.result-item > summary::after {
  content: "展开"; margin-left: auto; font-size: .76rem; color: var(--muted);
}
.result-item[open] > summary::after { content: "收起"; }
.result-item > summary.q-head { border-bottom: 0; padding-bottom: 0; margin-bottom: 0; }
.result-item[open] > summary.q-head {
  border-bottom: 1px dashed var(--line); padding-bottom: 8px; margin-bottom: 10px;
}

.answer-block { background: #f8fafc; border-radius: 8px; padding: 10px 12px; margin-bottom: 10px; }
.answer-block-title { font-size: .8rem; color: var(--muted); font-weight: 700; margin-bottom: 4px; }
.answer-text { white-space: pre-wrap; line-height: 1.7; }
.feedback-line { background: var(--blue-soft); border-radius: 8px; padding: 10px 12px; margin-bottom: 10px; font-size: .92rem; }
.analysis-detail, .ai-detail { margin-top: 8px; }
.analysis-detail summary, .ai-detail summary {
  cursor: pointer; font-size: .85rem; color: var(--blue); font-weight: 600;
}
.ai-panel {
  background: var(--violet-soft); border: 1px solid #ddd6fe; border-radius: 10px;
  padding: 12px; margin: 12px 0;
}
.ai-panel-head { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin-bottom: 8px; }
.grade-card.grade-pending { border-left: 4px solid var(--amber); }
.review-form { background: #f8fafc; border-radius: 10px; padding: 12px; margin-top: 12px; }

/* ---------------- 知识点列表 ---------------- */
.kp-list { list-style: none; padding: 0; margin: 0; }
.kp-list li { margin-bottom: 12px; }
.kp-line { display: flex; justify-content: space-between; gap: 8px; align-items: center; font-size: .9rem; }
.mastery-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 14px; }
.mastery-item { border: 1px solid var(--line); border-radius: 9px; padding: 10px 12px; }

/* ---------------- 待办 / 编辑器 ---------------- */
.todo-grid { display: grid; grid-template-columns: 1fr; gap: 14px; }
@media (min-width: 900px) { .todo-grid { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); } }
.todo-item { display: flex; gap: 14px; align-items: flex-start; border: 1px solid var(--line); border-radius: 10px; padding: 14px; }
.todo-count {
  flex: 0 0 48px; height: 48px; border-radius: 12px; background: var(--amber-soft); color: #78350f;
  display: grid; place-items: center; font-size: 1.3rem; font-weight: 800;
}

.options-editor, .dim-editor { display: flex; flex-direction: column; gap: 8px; }
.option-row { display: flex; align-items: center; gap: 8px; }
.option-row .option-key { flex: 0 0 26px; height: 26px; }
.option-row input[type="text"] { flex: 1 1 auto; }
.dim-row { display: grid; grid-template-columns: 1.2fr 90px 2fr; gap: 8px; }

.selected-list { display: flex; flex-direction: column; gap: 6px; }
.selected-row {
  display: flex; align-items: center; gap: 8px; padding: 7px 10px;
  border: 1px solid var(--line); border-radius: 8px; background: #f8fafc;
}
.selected-stem { flex: 1 1 auto; font-size: .88rem; }

.candidate-list {
  max-height: 340px; overflow: auto; border: 1px solid var(--line); border-radius: 9px;
  padding: 8px; background: #f8fafc;
}
.candidate { display: flex; gap: 8px; align-items: flex-start; padding: 7px 6px; cursor: pointer; border-radius: 7px; }
.candidate:hover { background: #eef2f7; }
.candidate input { width: auto; margin-top: 4px; }
.candidate-body { display: flex; flex-direction: column; gap: 3px; }
.candidate-stem { font-size: .88rem; }
.candidate-meta { display: flex; gap: 7px; align-items: center; font-size: .76rem; color: var(--muted); flex-wrap: wrap; }

.gen-card { border: 1px solid #fde68a; background: #fffdf5; border-radius: 10px; padding: 14px; margin-bottom: 14px; }
.gen-edit { margin-top: 8px; }
.gen-actions { margin-top: 10px; }

.tabs { display: flex; gap: 6px; flex-wrap: wrap; }
.tab {
  padding: 6px 14px; border-radius: 999px; font-size: .86rem;
  background: #f1f5f9; border: 1px solid var(--line); color: var(--ink-2);
}
.tab:hover { text-decoration: none; background: #e2e8f0; }
.tab-active { background: var(--blue); border-color: var(--blue); color: #fff; }

.dist-chip {
  display: inline-block; padding: 1px 7px; border-radius: 4px; background: #f1f5f9;
  border: 1px solid var(--line); margin-right: 4px; font-size: .76rem;
}
.dist-ok { background: var(--green-soft); border-color: #bbf7d0; }

.steps { padding-left: 20px; margin: 0; }
.steps li { margin-bottom: 7px; }
.faq { padding-left: 18px; margin: 0; font-size: .9rem; }
.faq li { margin-bottom: 6px; }
.empty { padding: 14px 0; }
.history summary { cursor: pointer; font-size: .8rem; color: var(--blue); }

/* ---------------- 教师首页：三个主入口 ---------------- */
.home-grid {
  display: grid; grid-template-columns: 1fr; gap: 16px; margin-bottom: 18px;
}
@media (min-width: 760px) { .home-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1180px) { .home-grid { grid-template-columns: repeat(4, 1fr); } }
.home-card {
  display: flex; flex-direction: column; gap: 8px;
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 22px 20px; color: var(--ink);
  transition: border-color .15s, box-shadow .15s, transform .15s;
}
.home-card:hover {
  text-decoration: none; border-color: var(--blue);
  box-shadow: 0 2px 6px rgba(15,23,42,.08), 0 14px 30px -14px rgba(37,99,235,.35);
  transform: translateY(-2px);
}
.home-card h2 { margin: 0; font-size: 1.16rem; }
.home-card p { margin: 0; font-size: .9rem; color: var(--ink-2); line-height: 1.65; }
.home-card .home-cta { margin-top: auto; color: var(--blue); font-weight: 700; font-size: .9rem; }
.home-card-primary { border-color: var(--blue); background: linear-gradient(180deg, #f5f9ff, #fff); }
.home-card-alert { border-color: #fde68a; background: linear-gradient(180deg, #fffdf5, #fff); }
.home-icon {
  width: 40px; height: 40px; border-radius: 11px; background: var(--blue-soft);
  color: var(--blue-dark); display: grid; place-items: center; font-size: 1.15rem; font-weight: 700;
}
.home-card-alert .home-icon { background: var(--amber-soft); color: #78350f; }

/* ---------------- 折叠区（进阶功能） ---------------- */
.adv-block {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow); margin-bottom: 18px; padding: 0;
}
.adv-block > summary {
  cursor: pointer; padding: 16px 20px; font-weight: 700; font-size: .95rem; color: var(--ink-2);
  list-style: none;
}
.adv-block > summary::-webkit-details-marker { display: none; }
.adv-block > summary::before { content: "▸ "; color: var(--muted); }
.adv-block[open] > summary::before { content: "▾ "; }
.adv-block > summary:hover { color: var(--blue); }
.adv-grid {
  display: grid; grid-template-columns: 1fr; gap: 10px;
  padding: 0 20px 20px;
}
@media (min-width: 780px) { .adv-grid { grid-template-columns: 1fr 1fr; } }
@media (min-width: 1150px) { .adv-grid { grid-template-columns: repeat(3, 1fr); } }
.adv-item {
  display: flex; flex-direction: column; gap: 3px;
  border: 1px solid var(--line); border-radius: 10px; padding: 12px 14px; color: var(--ink);
  background: #fcfdff;
}
.adv-item:hover { text-decoration: none; border-color: var(--blue); background: var(--blue-soft); }
.adv-item b { font-size: .95rem; }
.adv-item span { font-size: .82rem; color: var(--ink-2); }
.adv-item em { font-size: .76rem; color: var(--muted); font-style: normal; }

/* ---------------- 出卷页（快速出卷） ---------------- */
.quick-wrap { display: grid; grid-template-columns: 1fr; gap: 18px; }
@media (min-width: 1080px) {
  .quick-wrap { grid-template-columns: 460px 1fr; align-items: start; }
  .quick-left { position: sticky; top: 64px; }
}
.quick-left textarea {
  min-height: 340px; font-family: Consolas, "Courier New", monospace;
  font-size: .88rem; line-height: 1.75;
}
.quick-bar { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; margin-bottom: 10px; }

.qmini { border: 1px solid var(--line); border-radius: 10px; padding: 12px; margin-bottom: 10px; background: #fff; }
.qmini-head { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; margin-bottom: 8px; }
/* 题型下拉框必须窄：继承全局 input/select 的 width:100% 会在 flex 里撑满整行 */
.qmini-head .type-select {
  width: auto; max-width: 110px; flex: 0 0 auto;
  padding: 4px 8px; font-size: .82rem; border-radius: 7px;
}
.qmini-head .q-index { flex: 0 0 auto; }
.qmini-head .badge { flex: 0 0 auto; }
.qmini-head .ks-badge { max-width: 200px; overflow: hidden; text-overflow: ellipsis; }
.qmini-stem { font-weight: 600; margin-bottom: 8px; white-space: pre-wrap; }
.qmini .stem-text { min-height: 0; font-size: .95rem; font-weight: 600; }
.qmini .answer-text { min-height: 0; font-size: .9rem; }
.qmini-foot { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; margin-top: 8px; }
.score-in { max-width: 84px; }

.opt-pick { display: flex; align-items: flex-start; gap: 8px; padding: 6px 8px; border-radius: 7px; cursor: pointer; }
.opt-pick:hover { background: #f8fafc; }
.opt-pick.is-correct { background: var(--green-soft); }
.opt-pick input { width: auto; margin-top: 4px; flex: 0 0 auto; }
.empty-hint { padding: 26px 12px; text-align: center; color: var(--muted); }
.publish-box { border-color: #bfdbfe; background: linear-gradient(180deg, #f8fbff, #fff); }

/* ---------------- 表单模式（学生填表头 / 教师发表单） ---------------- */
.form-list { list-style: none; margin: 12px 0 0; padding: 0; }
.form-list-item {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  border: 1px solid var(--line); border-radius: 10px; padding: 12px 14px;
  margin-bottom: 8px; background: #fcfdff;
}
.form-list-main { display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.form-list-title { font-weight: 700; word-break: break-word; }
.btn-small { padding: 6px 14px; font-size: .84rem; }

.form-entry { max-width: 620px; }
.form-entry .form-entry-note {
  background: var(--blue-soft); color: var(--blue-dark); border-radius: 9px;
  padding: 10px 14px; font-size: .88rem; margin: 12px 0 4px;
}
.field-error { color: #b91c1c; font-size: .82rem; margin: 4px 0 0; }

.form-layout { display: flex; flex-direction: column; gap: 16px; }
.check-list { display: flex; flex-direction: column; gap: 8px; margin: 12px 0; }
.check-item {
  display: flex; align-items: flex-start; gap: 10px;
  border: 1px solid var(--line); border-radius: 10px; padding: 12px 14px;
  cursor: pointer; background: #fcfdff;
}
.check-item:hover { border-color: var(--blue); background: var(--blue-soft); }
.check-item input { width: auto; flex: 0 0 auto; margin-top: 3px; }
.check-item span { display: flex; flex-direction: column; gap: 2px; }
.inline-check { padding: 8px 10px; }
.form-row { display: grid; grid-template-columns: 1fr; gap: 12px; }
@media (min-width: 640px) { .form-row { grid-template-columns: 1fr 1fr; } }

.big-code {
  font-size: 2.1rem; font-weight: 800; letter-spacing: .22em; text-align: center;
  background: var(--blue-soft); color: var(--blue-dark); border-radius: 12px;
  padding: 14px 10px; margin-bottom: 4px; user-select: all;
}
.qr-box { text-align: center; margin-top: 16px; }
.plain-list { margin: 8px 0; padding-left: 20px; }
.plain-list li { margin-bottom: 5px; }
.row-actions { display: flex; gap: 6px; align-items: center; flex-wrap: wrap; }
.alert-card { border-color: #fde68a; background: linear-gradient(180deg, #fffdf5, #fff); }

/* ---------------- 发布方式二选一（发给班级 / 发链接） ---------------- */
.mode-pick { display: flex; flex-direction: column; gap: 8px; }
.mode-opt {
  display: flex; align-items: flex-start; gap: 10px;
  border: 1px solid var(--line); border-radius: 10px; padding: 11px 13px;
  cursor: pointer; background: #fcfdff;
}
.mode-opt:hover { border-color: var(--blue); background: var(--blue-soft); }
.mode-opt input { width: auto; flex: 0 0 auto; margin-top: 4px; }
.mode-opt span { display: flex; flex-direction: column; gap: 2px; }
.mode-opt b { font-size: .93rem; }
.mode-opt em { font-size: .78rem; color: var(--muted); font-style: normal; }
.mode-opt:has(input:checked) { border-color: var(--blue); background: var(--blue-soft); }

/* ---------------- 页脚 ---------------- */
.footer {
  max-width: 1220px; margin: 0 auto; padding: 18px 16px 32px;
  color: var(--muted); font-size: .82rem; text-align: center;
}
.footer-sep { margin: 0 6px; }

/* ---------------- 推荐练习的效果对比 ---------------- */
.compare-card { border-left: 3px solid var(--blue); }
.compare-conclusion {
  margin: 4px 0 14px; font-size: .98rem; font-weight: 600; color: var(--ink);
}
.compare-avg { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 14px; }
.compare-avg-item {
  flex: 1 1 240px; background: var(--blue-soft); border-radius: 10px;
  padding: 10px 12px; display: flex; flex-direction: column; gap: 2px;
}
.compare-avg-item b { font-size: 1.35rem; color: var(--blue); }
.delta-up { color: var(--ok); font-weight: 700; }
.delta-down { color: var(--danger); font-weight: 700; }

/* ---------------- 审核页：一行一题，要改才展开 ---------------- */
.gen-summary {
  margin: 6px 0 0; font-size: .88rem; line-height: 1.6; color: var(--ink);
}
.gen-edit-wrap > summary {
  cursor: pointer; font-size: .8rem; color: var(--blue);
  margin-top: 6px; user-select: none; list-style: none;
}
.gen-edit-wrap > summary::-webkit-details-marker { display: none; }
.gen-edit-wrap > summary::before { content: "▸ "; }
.gen-edit-wrap[open] > summary::before { content: "▾ "; }
.gen-edit { margin-top: 10px; }

/* ---------------- 公式（math.js 渲染出来结构）---------------- */.math { white-space: nowrap; }
.math sup, .math sub { font-size: .72em; line-height: 0; }
.math sup { vertical-align: super; }
.math sub { vertical-align: sub; }
.math-frac {
  display: inline-flex; flex-direction: column; vertical-align: middle;
  text-align: center; margin: 0 .18em; line-height: 1.15;
}
.math-num { border-bottom: 1px solid currentColor; padding: 0 .25em; }
.math-den { padding: 0 .25em; }
.math-sqrt { white-space: nowrap; }
.math-radicand { border-top: 1px solid currentColor; padding: 0 .15em; margin-left: 1px; }
/* 题干里的公式在窄屏上不要撑破布局 */
.q-stem .math, .option-text .math { white-space: normal; }

/* ============================================================
   一次练习：单页看板
   原来「布置详情 / 统计分析 / 评分复核」是三个页面，指标重复、点来点去。
   现在合成一页：顶部四个数，下面全部折叠成区块，需要什么展开什么。
   ============================================================ */

/* ---------------- 顶部核心指标 ---------------- */
.kpi-row {
  display: grid; grid-template-columns: repeat(2, 1fr);
  gap: 10px; margin-bottom: 14px;
}
/* auto-fit：三个指标排三列，一个指标也不会被拉成一整条 */
@media (min-width: 720px) { .kpi-row { grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); } }
.kpi-row-one { grid-template-columns: minmax(0, 240px) !important; }
.kpi {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 12px 14px; box-shadow: var(--shadow);
}
.kpi-value { font-size: 1.6rem; font-weight: 800; line-height: 1.2; color: var(--ink); }
.kpi-value.ok { color: var(--green); }
.kpi-value.warn { color: var(--amber); }
.kpi-sub { font-size: .85rem; font-weight: 600; color: var(--muted); margin-left: 2px; }
.kpi-label { font-size: .78rem; color: var(--muted); margin-top: 2px; }

.stat-row-mini .stat { padding: 10px; }
.stat-row-mini .stat-value { font-size: 1.1rem; }

/* ---------------- 折叠区块 ---------------- */
.fold { margin-top: 14px; }
.fold > summary {
  cursor: pointer; user-select: none; list-style: none;
  font-size: .9rem; color: var(--blue); font-weight: 600;
  display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
  padding: 4px 0;
}
.fold > summary::-webkit-details-marker { display: none; }
.fold > summary::before { content: "▸"; color: var(--muted); font-weight: 400; }
.fold[open] > summary::before { content: "▾"; }
.fold > summary .muted { font-weight: 400; }

/* 折叠区块本身也是一张卡片时 */
.fold-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 14px 16px; margin-bottom: 14px;
}
.fold-card > summary { font-size: 1.02rem; padding: 2px 0; }
.fold-card[open] > summary {
  margin-bottom: 12px; padding-bottom: 10px; border-bottom: 1px dashed var(--line);
}
.fold-sub {
  font-size: .82rem; color: var(--muted); font-weight: 600;
  margin: 12px 0 6px; letter-spacing: .02em;
}

/* ---------------- 逐题分析：一行一题，点开才看细节 ---------------- */
.q-item { border-bottom: 1px dashed var(--line); }
.q-item:last-child { border-bottom: 0; }
.q-item > summary {
  cursor: pointer; user-select: none; list-style: none;
  display: flex; align-items: center; gap: 10px;
  padding: 9px 2px; font-size: .9rem;
}
.q-item > summary::-webkit-details-marker { display: none; }
.q-item-no { flex: 0 0 auto; font-weight: 700; color: var(--blue); font-size: .84rem; }
.q-item-stem {
  flex: 1 1 auto; min-width: 0; color: var(--ink-2);
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.q-item-bar { flex: 0 0 auto; display: flex; align-items: center; gap: 8px; }
.q-item-bar .bar-mini { width: 54px; margin-bottom: 0; }
.q-item-bar b { font-size: .84rem; }
.bar-mini-warn span { background: var(--amber) !important; }
.warn-text { color: var(--amber); }
.q-item-body {
  padding: 6px 2px 14px 2px; font-size: .88rem; color: var(--ink-2);
}
.q-item-meta { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin-bottom: 8px; }
.q-item-full {
  white-space: pre-wrap; line-height: 1.7; margin: 0 0 8px;
  padding-left: 10px; border-left: 2px solid var(--line);
}
.dist-row { display: flex; flex-wrap: wrap; gap: 4px; margin-top: 6px; }

@media (max-width: 560px) {
  .q-item-stem { display: none; }   /* 窄屏一行放不下，点开直接看完整题干 */
  .q-item-bar { margin-left: auto; }
}

/* ---------------- 学生提交情况：一行一人，得分带得分率 ---------------- */
.data-table td .muted.small { display: inline; }

/* ---------------- 知识点体检：合并 / 清理 ---------------- */
.merge-row {
  display: flex; flex-wrap: wrap; gap: 10px; align-items: center;
  padding: 9px 0; border-bottom: 1px dashed var(--line);
}
.merge-row:last-child { border-bottom: 0; }
.merge-keep { flex: 0 0 auto; min-width: 150px; font-size: .9rem; }
.merge-list { flex: 1 1 auto; display: flex; flex-wrap: wrap; gap: 6px; }
.merge-list form { display: inline; }
.chip-del {
  border: 0; background: transparent; color: var(--muted); cursor: pointer;
  font-size: .95rem; line-height: 1; padding: 0 0 0 4px;
}
.chip-del:hover { color: var(--red); }
.mini-select {
  width: auto; max-width: 150px; padding: 4px 6px; font-size: .82rem;
  display: inline-block; margin-right: 4px;
}
.chip-active {
  background: var(--blue); border-color: var(--blue); color: #fff;
}
.chip-active .muted { color: #dbeafe; }

/* ---------------- 选题组卷：选了几道题要一直看得见 ---------------- */
.pick-bar { position: sticky; top: 8px; z-index: 5; }
.pick-bar .form-row { align-items: end; }
.pick-foot {
  position: sticky; bottom: 10px; z-index: 5;
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
  background: #fff; border: 1px solid var(--blue); border-radius: var(--radius);
  box-shadow: 0 10px 30px -12px rgba(37, 99, 235, .5);
  padding: 12px 16px; margin: 0 0 24px;
}
.pick-foot span { font-size: .9rem; }
.pick-box { width: auto; }

/* ---------------- 教材习题导入：逐题预览 ---------------- */
.import-item {
  border: 1px solid var(--line); border-radius: 10px;
  padding: 10px 12px; margin-bottom: 10px; background: #fcfdff;
}
.import-item > summary {
  cursor: pointer; list-style: none; display: flex; align-items: center;
  gap: 10px; font-size: .9rem;
}
.import-item > summary::-webkit-details-marker { display: none; }
.import-item > summary input[type="checkbox"] {
  width: auto; flex: 0 0 auto; margin: 0;
}
.import-keep {
  background: var(--blue-soft); border-radius: 8px; padding: 6px 10px;
  margin-bottom: 10px; width: auto;
}
.import-no { flex: 0 0 auto; font-weight: 700; color: var(--blue); font-size: .84rem; }
.import-stem {
  flex: 1 1 auto; min-width: 0; color: var(--ink-2);
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.import-badges { flex: 0 0 auto; display: flex; gap: 4px; }
.import-body { padding: 10px 2px 4px; }
@media (max-width: 620px) {
  .import-stem { display: none; }
  .import-badges { margin-left: auto; }
}