/* === Beijing Skill Taxonomy 知识浏览器样式 (2D 列表布局) === */
:root {
  --primary: #c8553d; --primary-light: #fdeae5;
  --accent: #2d6a7e; --green: #5b8c5a; --green-light: #e8f3e8;
  --orange: #d4863a; --orange-light: #fdf2e2;
  --bg: #f7f6f3; --sidebar-bg: #ffffff; --card-bg: #ffffff;
  --text: #2c2620; --text-light: #6b5d50; --text-muted: #a09385;
  --border: #e8e2d8; --radius: 10px;
  --shadow: 0 1px 3px rgba(44,38,32,0.08);
  --shadow-lg: 0 4px 16px rgba(44,38,32,0.12);
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif; background: var(--bg); color: var(--text); font-size: 14px; line-height: 1.6; }
#app { display: flex; min-height: 100vh; }

.sidebar { width: 290px; flex-shrink: 0; background: var(--sidebar-bg); border-right: 1px solid var(--border); display: flex; flex-direction: column; position: sticky; top: 0; height: 100vh; }
.sidebar-header { padding: 24px 20px 16px; border-bottom: 1px solid var(--border); }
.sidebar-header h1 { font-size: 20px; font-weight: 600; color: var(--text); }
.subtitle { font-size: 11px; color: var(--text-muted); letter-spacing: 0.5px; margin-top: 2px; }
.search-box { margin-top: 14px; }
.search-box input { width: 100%; padding: 8px 12px; border: 1px solid var(--border); border-radius: 8px; font-size: 13px; background: var(--bg); color: var(--text); transition: border-color 0.15s; }
.search-box input:focus { outline: none; border-color: var(--accent); background: #fff; }
.sidebar-stats { padding: 12px 20px; border-bottom: 1px solid var(--border); font-size: 12px; color: var(--text-light); }
.stat-line { margin-bottom: 2px; }
.stat-line strong { color: var(--accent); font-weight: 600; }

.dimension-bar { display: flex; align-items: center; gap: 6px; padding: 10px 20px; border-bottom: 1px solid var(--border); }
.dimension-label { font-size: 11px; color: var(--text-muted); flex-shrink: 0; }
.dimension-btns { display: flex; gap: 6px; flex: 1; }
.dimension-btn { flex: 1; padding: 5px 8px; border: 1px solid var(--border); border-radius: 6px; background: #fff; color: var(--text-light); font-size: 12px; cursor: pointer; transition: all 0.15s; white-space: nowrap; }
.dimension-btn:hover { border-color: var(--text-muted); }
.dimension-btn.active { background: var(--accent); color: #fff; border-color: var(--accent); font-weight: 500; }

.filter-bar { display: flex; align-items: center; gap: 6px; padding: 10px 20px; border-bottom: 1px solid var(--border); }
.filter-label { font-size: 11px; color: var(--text-muted); flex-shrink: 0; }
#age-filter { flex: 1; padding: 5px 8px; border: 1px solid var(--border); border-radius: 6px; background: #fff; color: var(--text-light); font: inherit; font-size: 12px; cursor: pointer; }
#age-filter:focus { outline: none; border-color: var(--accent); }

.tree { flex: 1; overflow-y: auto; padding: 8px 0; }
.tree-subject { margin-bottom: 2px; }
.tree-subject-header { display: flex; align-items: center; gap: 6px; padding: 8px 20px; cursor: pointer; transition: background 0.15s; }
.tree-subject-header:hover { background: var(--bg); }
.tree-subject-header.current { background: var(--primary-light); color: var(--primary); font-weight: 500; }
.tree-domain.current { background: var(--primary-light); color: var(--primary); font-weight: 500; }
.tree-subject-header .arrow { font-size: 10px; color: var(--text-muted); transition: transform 0.15s; display: inline-block; width: 10px; }
.tree-subject.open .tree-subject-header .arrow { transform: rotate(90deg); }
.tree-subject-count { margin-left: auto; font-size: 11px; color: var(--text-muted); }
.tree-subject-count .translated { color: var(--green); }
.tree-domains { display: none; padding-bottom: 4px; }
.tree-subject.open .tree-domains { display: block; }
.tree-domain { display: flex; align-items: center; padding: 5px 20px 5px 42px; font-size: 13px; color: var(--text-light); text-decoration: none; cursor: pointer; transition: background 0.15s; }
.tree-domain:hover { background: var(--bg); color: var(--text); }
.tree-domain-count { margin-left: auto; font-size: 11px; color: var(--text-muted); }
.tree-loading, .stat-loading { color: var(--text-muted); font-size: 13px; padding: 16px 20px; }
.sidebar-footer { padding: 10px 20px; border-top: 1px solid var(--border); font-size: 11px; color: var(--text-muted); display: flex; gap: 6px; align-items: center; }
.sidebar-footer a { color: var(--text-light); text-decoration: none; }
.sidebar-footer a:hover { color: var(--accent); }

.content { flex: 1; padding: 32px 40px; max-width: 1100px; }
.view { display: none; }
.view.active { display: block; }

.overview-hero { margin-bottom: 28px; }
.overview-hero h2 { font-size: 28px; font-weight: 600; margin-bottom: 8px; }
.hero-desc { color: var(--text-light); font-size: 15px; max-width: 640px; }
.overview-stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-bottom: 36px; }
.stat-card { background: var(--card-bg); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow); }
.stat-card .num { font-size: 32px; font-weight: 700; color: var(--text); }
.stat-card .label { font-size: 12px; color: var(--text-muted); margin-top: 4px; }
.stat-card.highlight { background: var(--green-light); border-color: var(--green); }
.stat-card.highlight .num { color: var(--green); }
.overview-section { margin-bottom: 36px; }
.overview-section h3 { font-size: 18px; font-weight: 600; margin-bottom: 16px; }
.subject-cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 16px; }
.subject-card { display: block; text-decoration: none; color: inherit; background: var(--card-bg); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px; cursor: pointer; transition: all 0.15s; box-shadow: var(--shadow); }
.subject-card:hover { box-shadow: var(--shadow-lg); border-color: var(--accent); transform: translateY(-1px); }
.subject-card h4 { font-size: 16px; font-weight: 600; margin-bottom: 8px; }
.subject-card .meta { font-size: 12px; color: var(--text-muted); display: flex; gap: 10px; margin-bottom: 8px; }
.domains-preview { font-size: 12px; color: var(--text-light); line-height: 1.5; }
.license-info table { width: 100%; border-collapse: collapse; background: var(--card-bg); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); }
.license-info th, .license-info td { padding: 12px 16px; text-align: left; border-bottom: 1px solid var(--border); font-size: 13px; }
.license-info th { background: var(--bg); color: var(--text-light); font-weight: 500; width: 120px; }
.license-info tr:last-child th, .license-info tr:last-child td { border-bottom: none; }

.list-header { display: flex; align-items: center; gap: 16px; margin-bottom: 24px; }
.back-btn { padding: 6px 14px; border: 1px solid var(--border); border-radius: 8px; background: var(--card-bg); color: var(--text-light); font-size: 13px; cursor: pointer; transition: all 0.15s; }
.back-btn:hover { border-color: var(--accent); color: var(--accent); }
.list-header h2 { font-size: 22px; font-weight: 600; }
.list-count { font-size: 13px; color: var(--text-muted); }
.list-spacer { flex: 1; }
.bulk-mastery-apply { padding: 6px 14px; border: 1px solid var(--green); border-radius: 8px; background: var(--green); color: #fff; font: inherit; font-size: 13px; cursor: pointer; }
.bulk-mastery-apply:disabled { opacity: .5; cursor: default; }
.topic-card.bulk-selecting { position: relative; }
.bulk-mastery-check { position: absolute; top: 12px; right: 12px; width: 18px; height: 18px; accent-color: var(--green); cursor: pointer; }
.topic-card.is-mastered { border-color: var(--green); }
.topic-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 16px; }
.topic-card { display: block; text-decoration: none; color: inherit; background: var(--card-bg); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px; cursor: pointer; transition: all 0.15s; box-shadow: var(--shadow); }
.topic-card:hover { box-shadow: var(--shadow-lg); border-color: var(--accent); transform: translateY(-1px); }
.topic-card.untranslated { opacity: 0.7; }
.card-name { font-size: 15px; font-weight: 600; margin-bottom: 6px; line-height: 1.4; }
.card-desc { font-size: 12px; color: var(--text-light); margin-bottom: 10px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.card-meta { display: flex; flex-wrap: wrap; gap: 6px; }
.tag { display: inline-block; padding: 2px 8px; border-radius: 4px; font-size: 11px; font-weight: 500; }
.tag-subject { background: var(--primary-light); color: var(--primary); }
.tag-age { background: var(--bg); color: var(--text-light); border: 1px solid var(--border); }
.tag-translated { background: var(--green-light); color: var(--green); }
.tag-untranslated { background: var(--orange-light); color: var(--orange); }
.tag-dim-hidden { background: var(--orange-light); color: var(--orange); border: 1px dashed var(--orange); }
.tag-us { background: var(--primary-light); color: var(--primary); border: 1px solid var(--primary); }
.detail-filter-link { text-decoration: none; }
.detail-filter-link:hover, .detail-filter-link:focus-visible { outline: none; text-decoration: underline; }

.detail-header { display: flex; align-items: center; gap: 16px; margin-bottom: 24px; flex-wrap: wrap; }
.detail-badges { display: flex; gap: 6px; flex-wrap: wrap; }
.detail-body h2 { font-size: 26px; font-weight: 600; margin-bottom: 4px; }
.detail-title-row { display: flex; align-items: flex-start; justify-content: space-between; gap: 16px; }
.mastery-action { flex: 0 0 138px; min-height: 36px; border: 1px solid var(--green); border-radius: 8px; background: var(--green); color: #fff; font: inherit; font-size: 13px; font-weight: 500; cursor: pointer; }
.mastery-action:hover { opacity: .9; }
.mastery-action.mastered { background: var(--green-light); color: var(--green); }
.detail-id { font-family: "SF Mono", Monaco, Consolas, monospace; font-size: 12px; color: var(--text-muted); margin-bottom: 24px; }
.detail-section { margin-bottom: 28px; }
.detail-section h3 { font-size: 15px; font-weight: 600; margin-bottom: 10px; color: var(--text); }
.detail-desc { color: var(--text-light); line-height: 1.7; font-size: 14px; }
.evidence-list { list-style: none; }
.evidence-list li { padding: 8px 0 8px 24px; position: relative; color: var(--text-light); font-size: 13px; border-bottom: 1px solid var(--border); }
.evidence-list li:last-child { border-bottom: none; }
.evidence-list li::before { content: "✓"; position: absolute; left: 4px; color: var(--green); font-weight: 600; }
.assessment-box { background: var(--primary-light); border-left: 3px solid var(--primary); padding: 14px 16px; border-radius: 0 8px 8px 0; font-size: 14px; color: var(--text); line-height: 1.7; }
.placeholder { display: inline-block; background: var(--accent); color: #fff; padding: 1px 8px; border-radius: 4px; font-size: 12px; font-weight: 500; }
.assessment-form { margin-top: 14px; }
.assessment-label { display: block; font-size: 13px; color: var(--text-light); }
.assessment-answer { width: 100%; min-height: 96px; margin-top: 6px; padding: 10px 12px; resize: vertical; border: 1px solid var(--border); border-radius: 8px; background: var(--card-bg); color: var(--text); font: inherit; line-height: 1.55; }
.assessment-answer:focus { outline: 2px solid var(--accent); outline-offset: 1px; border-color: var(--accent); }
.assessment-actions { display: flex; align-items: center; gap: 10px; margin-top: 9px; flex-wrap: wrap; }
.assessment-submit { min-height: 36px; padding: 0 14px; border: 0; border-radius: 7px; background: var(--accent); color: #fff; font: inherit; font-size: 13px; cursor: pointer; }
.assessment-submit:disabled { opacity: .55; cursor: wait; }
.assessment-note { font-size: 11px; color: var(--text-muted); }
.assessment-result { margin-top: 12px; font-size: 13px; line-height: 1.6; }
.assessment-result:empty { display: none; }
.assessment-result.pending { color: var(--text-light); }
.assessment-result.error { color: var(--primary); background: var(--primary-light); border-radius: 7px; padding: 9px 11px; }
.assessment-score { display: flex; align-items: baseline; gap: 4px; color: var(--accent); }
.assessment-score strong { font-size: 24px; }
.assessment-result p { margin: 5px 0; }
.assessment-result h5 { margin-top: 10px; font-size: 12px; color: var(--text-light); }
.assessment-result ul { margin: 4px 0 0 18px; }
.standards-list { display: flex; flex-direction: column; gap: 8px; }
.standard-item { background: var(--bg); border: 1px solid var(--border); border-radius: 8px; padding: 12px 14px; }
.std-key { font-family: "SF Mono", Monaco, Consolas, monospace; font-size: 12px; color: var(--accent); font-weight: 600; }
.std-strand { font-size: 12px; color: var(--text-muted); margin: 3px 0; }
.std-note { font-size: 13px; color: var(--text-light); }

.dep-section { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.dep-box h4 { font-size: 13px; font-weight: 500; color: var(--text-muted); margin-bottom: 10px; }
.dep-link { display: flex; align-items: center; gap: 8px; padding: 8px 12px; background: var(--bg); border: 1px solid var(--border); border-radius: 6px; margin-bottom: 6px; text-decoration: none; color: var(--text); cursor: pointer; transition: all 0.15s; }
.dep-link:hover { background: #fff; border-color: var(--accent); }
.dep-name { flex: 1; font-size: 13px; }
.dep-strength { font-size: 10px; padding: 1px 6px; border-radius: 3px; font-weight: 500; }
.dep-strength.hard { background: var(--primary-light); color: var(--primary); }
.dep-strength.soft { background: var(--bg); color: var(--text-muted); border: 1px solid var(--border); }
.dep-reason { font-size: 12px; color: var(--text-muted); padding: 4px 12px 8px; line-height: 1.5; }
.dep-link.dim-hidden { opacity: 0.45; }
.dep-link.dim-hidden .dep-name { text-decoration: line-through; text-decoration-color: var(--text-muted); }
.dim-hidden-tag { font-size: 10px; color: var(--orange); border: 1px solid var(--orange); border-radius: 3px; padding: 0 4px; margin-left: 6px; white-space: nowrap; }

/* === 审核闸门: AI 推测(未审核)关联的降级样式 === */
/* 强度标签: reviewed 边保持原 .hard/.soft 配色;machine 边统一灰色 + 虚线 */
.dep-strength.unverified {
  background: #9ca3af;
  color: #fff;
  border: 1px dashed rgba(0, 0, 0, 0.25);
  font-size: 10px;
  cursor: help;
}
/* 整条 machine 链接卡片降级: 半透明 + 虚线左边框,与 reviewed 边明显区分 */
.dep-link.machine {
  opacity: 0.7;
  border-left: 3px dashed #9ca3af;
  border-style: dashed;
}
.dep-link.machine:hover { opacity: 1; }

/* "仅显示已审核关联" toggle */
.review-toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  margin-bottom: 12px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 13px;
  color: var(--text-light);
  cursor: pointer;
  user-select: none;
}
.review-toggle input { cursor: pointer; margin: 0; }
.review-toggle span { line-height: 1.4; }
.review-toggle-hint {
  margin-left: auto;
  font-size: 11px;
  color: var(--text-muted);
  white-space: nowrap;
}
/* 空态提示 */
.dep-empty { color: var(--text-muted); font-size: 13px; padding: 4px 0; }
.dep-empty-toggle {
  color: var(--accent);
  cursor: pointer;
  margin-left: 6px;
  text-decoration: underline dashed;
}

/* === 课本目录对比 === */
.tag-missing { background: var(--primary-light); color: var(--primary); }
.tag-covered { background: var(--green-light); color: var(--green); }
.tag-textbook-only { background: var(--orange-light); color: var(--orange); }

.gap-filters { display: flex; flex-direction: column; gap: 8px; margin-bottom: 14px; }
.gap-filter-row { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.gap-filter-btns { display: flex; gap: 6px; flex-wrap: wrap; }
.gap-filter-row .filter-btn { padding: 4px 10px; font-size: 12px; }
.gap-filter-row .filter-btn .filter-n { color: var(--text-muted); font-size: 11px; margin-left: 2px; }
.gap-search { margin-bottom: 14px; }
.gap-search input { width: 100%; max-width: 360px; padding: 8px 12px; border: 1px solid var(--border); border-radius: 8px; font-size: 13px; background: var(--bg); color: var(--text); transition: border-color 0.15s; }
.gap-search input:focus { outline: none; border-color: var(--accent); background: #fff; }

.gap-table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); background: var(--card-bg); }
.gap-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.gap-table thead th { position: sticky; top: 0; background: var(--bg); color: var(--text-light); font-weight: 500; text-align: left; padding: 10px 14px; border-bottom: 1px solid var(--border); white-space: nowrap; z-index: 1; }
.gap-table tbody td { padding: 9px 14px; border-bottom: 1px solid var(--border); color: var(--text); vertical-align: top; }
.gap-table tbody tr:last-child td { border-bottom: none; }
.gap-table tbody tr:hover { background: var(--bg); }
.gap-topic { font-weight: 500; min-width: 200px; }
.gap-path { font-size: 11px; color: var(--text-muted); font-weight: 400; margin-top: 2px; }
.gap-textbook { font-size: 12px; color: var(--text-light); white-space: nowrap; }

@media (max-width: 900px) {
  #app { flex-direction: column; }
  .sidebar { width: 100%; height: auto; position: relative; }
  .tree { max-height: 300px; }
  .content { padding: 20px; }
  .overview-stats { grid-template-columns: repeat(2, 1fr); }
  .dep-section { grid-template-columns: 1fr; }
}