/* ============================================================
   AGV/AMR 培训平台 — 设计系统 v2.0
   方案A：深钢铁蓝 #0f2942 + 工业橙 #f97316
   CDN: bootcdn.net (Tabler Icons)
   字体: 系统字体栈，禁止引用 googleapis.com
   ============================================================ */

/* ============================================================
   DESIGN TOKENS
============================================================ */
:root {
  --color-primary-900: #061524;
  --color-primary-800: #0f2942;
  --color-primary-700: #1a3f62;
  --color-primary-600: #25547f;
  --color-primary-100: #dce9f5;
  --color-primary-50:  #f0f6fc;

  --color-accent:       #f97316;
  --color-accent-hover: #ea6c0a;
  --color-accent-light: #fff4ed;
  --color-accent-50:    #fff7f0;

  --color-success:     #0d9488;
  --color-success-bg:  #ecfdf5;
  --color-warning:     #d97706;
  --color-warning-bg:  #fffbeb;
  --color-danger:      #dc2626;
  --color-danger-bg:   #fef2f2;
  --color-info:        #0284c7;
  --color-info-bg:     #f0f9ff;

  --color-gray-50:  #f8fafc;
  --color-gray-100: #f1f5f9;
  --color-gray-200: #e2e8f0;
  --color-gray-300: #cbd5e1;
  --color-gray-400: #94a3b8;
  --color-gray-500: #64748b;
  --color-gray-600: #475569;
  --color-gray-700: #334155;
  --color-gray-900: #0d1f2d;

  /* Surface & Text (light) */
  --bg:             #f4f6f9;
  --surface:        #ffffff;
  --surface-raised: #ffffff;
  --border:         #d1dae6;
  --border-light:   #e8edf4;
  --text-primary:   #0d1f2d;
  --text-secondary: #5a6e7f;
  --text-muted:     #8a9aaa;

  /* Sidebar */
  --sidebar-bg:     #0f2942;
  --sidebar-text:   #a8c3d8;
  --sidebar-hover:  rgba(255,255,255,0.08);
  --sidebar-border: rgba(255,255,255,0.08);
  --sidebar-width:  260px;

  /* Shadow */
  --shadow-sm:  0 1px 3px rgba(15,41,66,0.08), 0 1px 2px rgba(15,41,66,0.04);
  --shadow-md:  0 4px 12px rgba(15,41,66,0.10), 0 2px 4px rgba(15,41,66,0.06);
  --shadow-lg:  0 10px 30px rgba(15,41,66,0.12), 0 4px 8px rgba(15,41,66,0.06);

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --transition: 0.18s ease;
}

/* Dark mode */
[data-theme="dark"] {
  --bg:             #0a1929;
  --surface:        #0f2038;
  --surface-raised: #162840;
  --border:         #1e3650;
  --border-light:   #1a2f48;
  --text-primary:   #e2edf7;
  --text-secondary: #7ca4c0;
  --text-muted:     #4a6880;
  --color-primary-50:  #0f2038;
  --color-primary-100: #1a3650;
  --color-accent-light: #2a1a0a;
  --color-accent-50:   #1e1408;
  --color-success-bg:  #062a24;
  --color-warning-bg:  #2a1e06;
  --color-danger-bg:   #2a0a0a;
  --color-info-bg:     #062030;
  --color-gray-50:  #0f2038;
  --color-gray-100: #162840;
  --color-gray-200: #1e3650;
  --sidebar-bg:     #061524;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.35);
  --shadow-lg: 0 10px 30px rgba(0,0,0,0.4);
}

/* ============================================================
   RESET & BASE
============================================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 14px; scroll-behavior: smooth; }

body {
  font-family:
    "HarmonyOS Sans SC", "PingFang SC", "Microsoft YaHei UI",
    "Noto Sans SC", -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg);
  color: var(--text-primary);
  line-height: 1.6;
  display: flex;
  min-height: 100vh;
  transition: background var(--transition), color var(--transition);
}

a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }

/* ============================================================
   SIDEBAR
============================================================ */
.sidebar {
  width: var(--sidebar-width);
  background: var(--sidebar-bg);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0; left: 0;
  height: 100vh;
  z-index: 200;
  overflow-y: auto;
}

.sidebar::-webkit-scrollbar { width: 4px; }
.sidebar::-webkit-scrollbar-track { background: transparent; }
.sidebar::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.15); border-radius: 2px; }

.sidebar-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 20px 20px 16px;
  border-bottom: 1px solid var(--sidebar-border);
  flex-shrink: 0;
}

.logo-icon {
  width: 36px; height: 36px;
  background: var(--color-accent);
  border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.logo-icon .ti { font-size: 20px; color: #fff; }
.logo-title    { font-size: 13px; font-weight: 700; color: #fff; line-height: 1.3; letter-spacing: 0.02em; }
.logo-subtitle { font-size: 11px; color: var(--sidebar-text); margin-top: 1px; }

/* Sidebar progress */
.sidebar-progress {
  margin: 14px 14px 0;
  background: rgba(255,255,255,0.06);
  border-radius: var(--radius-md);
  padding: 12px 14px;
  border: 1px solid var(--sidebar-border);
  flex-shrink: 0;
}
.sidebar-progress-label {
  display: flex; justify-content: space-between; align-items: center;
  margin-bottom: 8px;
}
.sidebar-progress-label span:first-child {
  font-size: 11px; color: var(--sidebar-text);
  text-transform: uppercase; letter-spacing: 0.06em; font-weight: 600;
}
.sidebar-progress-label span:last-child { font-size: 12px; color: var(--color-accent); font-weight: 700; }
.sidebar-progress-bar { height: 4px; background: rgba(255,255,255,0.12); border-radius: 2px; overflow: hidden; }
.sidebar-progress-fill { height: 100%; background: var(--color-accent); border-radius: 2px; width: 0%; transition: width 0.4s ease; }
.sidebar-progress-stats { display: flex; gap: 8px; margin-top: 8px; }
.sidebar-stat { flex: 1; text-align: center; }
.sidebar-stat-num   { display: block; font-size: 15px; font-weight: 700; color: #fff; line-height: 1.2; }
.sidebar-stat-label { display: block; font-size: 10px; color: var(--sidebar-text); margin-top: 1px; }

/* Sidebar nav */
.sidebar-nav { padding: 12px 0; flex: 1; }
.nav-section { margin-bottom: 4px; }
.nav-section-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 7px 14px 7px 16px;
  cursor: pointer; transition: background var(--transition); user-select: none;
}
.nav-section-header:hover { background: var(--sidebar-hover); }
.nav-section-header-left { display: flex; align-items: center; gap: 8px; }
.nav-section-label { font-size: 11px; font-weight: 700; color: var(--sidebar-text); text-transform: uppercase; letter-spacing: 0.07em; }
.nav-section-count { font-size: 10px; color: var(--sidebar-text); background: rgba(255,255,255,0.1); padding: 1px 6px; border-radius: 10px; }
.nav-section-chevron { font-size: 14px; color: var(--sidebar-text); transition: transform var(--transition); }
.nav-section.is-open .nav-section-chevron { transform: rotate(180deg); }
.nav-items { display: none; padding: 0 8px; }
.nav-section.is-open .nav-items { display: block; }

.nav-item {
  display: flex; align-items: center; gap: 10px;
  padding: 7px 10px; border-radius: var(--radius-md);
  cursor: pointer; transition: background var(--transition);
  color: var(--sidebar-text); font-size: 13px; margin-bottom: 1px;
}
.nav-item:hover { background: var(--sidebar-hover); color: #fff; }
.nav-item.is-active { background: rgba(249,115,22,0.15); color: var(--color-accent); }
.nav-item-icon  { font-size: 16px; flex-shrink: 0; }
.nav-item-text  { flex: 1; line-height: 1.3; }
.nav-item-status { width: 7px; height: 7px; border-radius: 50%; flex-shrink: 0; }
.status-done     { background: var(--color-success); }
.status-progress { background: var(--color-accent); }
.status-todo     { background: rgba(255,255,255,0.2); border: 1.5px solid rgba(255,255,255,0.3); }

.sidebar-footer {
  padding: 12px 14px;
  border-top: 1px solid var(--sidebar-border);
  display: flex; align-items: center; justify-content: space-between;
  flex-shrink: 0;
}
.sidebar-footer-actions { display: flex; gap: 4px; }
.sidebar-footer-btn {
  width: 32px; height: 32px; border-radius: var(--radius-md);
  background: var(--sidebar-hover); border: none; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  color: var(--sidebar-text); transition: background var(--transition), color var(--transition);
}
.sidebar-footer-btn:hover { background: rgba(255,255,255,0.15); color: #fff; }
.sidebar-footer-btn .ti { font-size: 16px; }
.sidebar-version { font-size: 11px; color: rgba(255,255,255,0.25); }

/* ============================================================
   MAIN LAYOUT
============================================================ */
.main-layout {
  margin-left: var(--sidebar-width);
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  min-width: 0;
}

/* ============================================================
   TOPBAR
============================================================ */
.topbar {
  height: 56px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center;
  padding: 0 28px; gap: 16px;
  position: sticky; top: 0; z-index: 100;
  box-shadow: var(--shadow-sm);
}
.topbar-breadcrumb {
  display: flex; align-items: center; gap: 6px;
  font-size: 13px; color: var(--text-secondary);
}
.topbar-breadcrumb a { color: var(--text-secondary); transition: color var(--transition); }
.topbar-breadcrumb a:hover { color: var(--color-accent); }
.topbar-breadcrumb .ti { font-size: 12px; }
.topbar-breadcrumb-current { color: var(--text-primary); font-weight: 600; }
.topbar-spacer { flex: 1; }

.topbar-search { position: relative; display: flex; align-items: center; }
.topbar-search input {
  width: 220px; height: 34px;
  background: var(--bg); border: 1px solid var(--border);
  border-radius: var(--radius-md); padding: 0 12px 0 36px;
  font-size: 13px; color: var(--text-primary); font-family: inherit;
  outline: none; transition: border-color var(--transition), width var(--transition);
}
.topbar-search input:focus { border-color: var(--color-accent); width: 280px; }
.topbar-search input::placeholder { color: var(--text-muted); }
.topbar-search .search-icon { position: absolute; left: 10px; font-size: 15px; color: var(--text-muted); pointer-events: none; }

.topbar-actions { display: flex; align-items: center; gap: 6px; }
.topbar-btn {
  width: 34px; height: 34px; border-radius: var(--radius-md);
  background: transparent; border: 1px solid var(--border);
  cursor: pointer; display: flex; align-items: center; justify-content: center;
  color: var(--text-secondary); transition: all var(--transition);
}
.topbar-btn:hover { background: var(--color-primary-50); border-color: var(--color-primary-100); color: var(--color-primary-800); }
.topbar-btn .ti { font-size: 17px; }
.lang-badge {
  height: 34px; padding: 0 12px; border-radius: var(--radius-md);
  background: var(--bg); border: 1px solid var(--border);
  cursor: pointer; display: flex; align-items: center; gap: 6px;
  font-size: 12px; font-weight: 600; color: var(--text-secondary);
  transition: all var(--transition);
}
.lang-badge:hover { border-color: var(--color-accent); color: var(--color-accent); }

/* ============================================================
   PAGE CONTENT
============================================================ */
.page-content {
  flex: 1;
  padding: 28px;
  max-width: 960px;
  width: 100%;
}

/* ============================================================
   MODULE PAGE HEADER (知识模块标题区)
============================================================ */
.module-page-header {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 28px 32px;
  margin-bottom: 20px;
  box-shadow: var(--shadow-sm);
  border-top: 3px solid var(--color-accent);
}

.mph-meta {
  display: flex; align-items: center; gap: 10px;
  margin-bottom: 14px;
}
.mph-module-badge {
  font-size: 11px; font-weight: 800;
  color: var(--color-primary-700);
  background: var(--color-primary-100);
  padding: 3px 10px; border-radius: var(--radius-sm);
  letter-spacing: 0.06em; text-transform: uppercase;
}
.mph-section-label {
  font-size: 12px; color: var(--text-secondary);
  display: flex; align-items: center; gap: 5px;
}
.mph-section-label .ti { font-size: 13px; }
.mph-separator { color: var(--color-gray-300); font-size: 12px; }

.mph-title {
  font-size: 22px; font-weight: 700;
  color: var(--text-primary); line-height: 1.4;
  margin-bottom: 10px;
}
.mph-desc {
  font-size: 14px; color: var(--text-secondary); line-height: 1.7;
  margin-bottom: 14px;
}
.mph-footer {
  display: flex; align-items: center; gap: 10px;
  padding-top: 14px;
  border-top: 1px solid var(--border-light);
  flex-wrap: wrap;
}
.mph-tag {
  display: inline-flex; align-items: center; gap: 5px;
  font-size: 12px; font-weight: 600;
  padding: 4px 10px; border-radius: var(--radius-sm);
  background: var(--color-accent-light); color: var(--color-accent);
}
.mph-tag .ti { font-size: 13px; }
.mph-tag-plain {
  display: inline-flex; align-items: center; gap: 5px;
  font-size: 12px; font-weight: 500;
  padding: 4px 10px; border-radius: var(--radius-sm);
  background: var(--color-gray-100); color: var(--color-gray-600);
}

/* ============================================================
   SECTION LABEL (区块分隔标题)
============================================================ */
.section-label {
  display: flex; align-items: center; gap: 10px;
  margin: 24px 0 14px;
}
.section-label-bar {
  width: 4px; height: 18px;
  background: var(--color-accent);
  border-radius: 2px; flex-shrink: 0;
}
.section-label-text { font-size: 15px; font-weight: 700; color: var(--text-primary); }

/* ============================================================
   CONTENT CARD (通用卡片)
============================================================ */
.content-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  margin-bottom: 16px;
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.content-card-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 20px;
  border-bottom: 1px solid var(--border);
}
.content-card-title-group { display: flex; align-items: center; gap: 10px; }
.content-card-icon {
  width: 34px; height: 34px;
  background: var(--color-primary-50);
  border: 1px solid var(--color-primary-100);
  border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
  color: var(--color-primary-700); flex-shrink: 0;
}
.content-card-icon .ti { font-size: 18px; }
.content-card-icon.accent { background: var(--color-accent); border: none; }
.content-card-icon.accent .ti { color: #fff; }
.content-card-title    { font-size: 15px; font-weight: 700; color: var(--text-primary); }
.content-card-subtitle { font-size: 12px; color: var(--text-secondary); margin-top: 2px; }
.content-card-body { padding: 20px; }

/* ============================================================
   KNOWLEDGE MODULE CARD (知识条目卡片)
============================================================ */
.knowledge-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  margin-bottom: 14px;
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: box-shadow var(--transition);
}
.knowledge-card:hover { box-shadow: var(--shadow-md); }
.knowledge-card::before {
  content: "";
  display: block;
  height: 3px;
  background: transparent;
  transition: background var(--transition);
}
.knowledge-card:hover::before { background: var(--color-accent); }

.kc-header {
  display: flex; align-items: center; gap: 14px;
  padding: 18px 20px 14px;
}
.kc-num {
  width: 36px; height: 36px; border-radius: var(--radius-md);
  background: var(--color-primary-100);
  color: var(--color-primary-700);
  font-size: 14px; font-weight: 800;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
[data-theme="dark"] .kc-num { background: rgba(168,195,216,0.15); color: var(--sidebar-text); }
.kc-icon-wrap {
  width: 36px; height: 36px; border-radius: var(--radius-md);
  background: var(--color-primary-50);
  border: 1px solid var(--color-primary-100);
  display: flex; align-items: center; justify-content: center;
  color: var(--color-primary-700); flex-shrink: 0;
}
.kc-icon-wrap .ti { font-size: 18px; }
.kc-title { font-size: 15px; font-weight: 700; color: var(--text-primary); line-height: 1.4; }
.kc-subtitle { font-size: 12px; color: var(--text-secondary); margin-top: 2px; font-style: italic; }
.kc-badge {
  margin-left: auto;
  font-size: 11px; font-weight: 700;
  padding: 3px 8px; border-radius: 100px;
  text-transform: uppercase; letter-spacing: 0.04em; flex-shrink: 0;
}
.kc-badge-blue  { background: var(--color-primary-100); color: var(--color-primary-700); }
.kc-badge-green { background: var(--color-success-bg); color: var(--color-success); }
.kc-badge-orange{ background: var(--color-accent-light); color: var(--color-accent); }

.kc-body {
  padding: 0 20px 18px;
  border-top: 1px solid var(--border-light);
  margin-top: 4px;
}

/* Collapsible cards */
.knowledge-card.is-collapsible .kc-body { display: none; }
.knowledge-card.is-collapsible.is-open .kc-body { display: block; }
.knowledge-card.is-collapsible .kc-header { cursor: pointer; }

/* ============================================================
   INFO ROW (信息行，用于规格列表等)
============================================================ */
.info-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  margin-top: 10px;
}
.info-table th {
  text-align: left;
  padding: 8px 14px;
  background: var(--color-gray-50);
  color: var(--text-secondary);
  font-weight: 700;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 1px solid var(--border);
}
[data-theme="dark"] .info-table th { background: rgba(255,255,255,0.04); }
.info-table td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border-light);
  color: var(--text-primary);
  vertical-align: top;
}
.info-table tr:last-child td { border-bottom: none; }
.info-table tr:hover td { background: var(--color-primary-50); }
[data-theme="dark"] .info-table tr:hover td { background: rgba(255,255,255,0.03); }

/* ============================================================
   COMPARISON GRID (对比区块，替代蓝紫渐变 comparison-box)
============================================================ */
.comparison-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-top: 4px;
}
.comparison-col {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 18px 20px;
  box-shadow: var(--shadow-sm);
}
.comparison-col-header {
  display: flex; align-items: center; gap: 8px;
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-light);
}
.comparison-col-badge {
  font-size: 11px; font-weight: 800;
  padding: 3px 8px; border-radius: var(--radius-sm);
  text-transform: uppercase; letter-spacing: 0.04em;
}
.badge-agv { background: var(--color-primary-100); color: var(--color-primary-700); }
.badge-amr { background: var(--color-accent-light); color: var(--color-accent); }
.comparison-col-title { font-size: 14px; font-weight: 700; color: var(--text-primary); }
.comparison-list { display: flex; flex-direction: column; gap: 8px; }
.comparison-item {
  display: flex; align-items: flex-start; gap: 8px;
  font-size: 13px; color: var(--text-secondary);
}
.comparison-item-dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--color-accent); flex-shrink: 0; margin-top: 5px;
}

/* ============================================================
   STEP CARD (步骤卡片)
============================================================ */
.step-list { display: flex; flex-direction: column; gap: 0; }

.step-item {
  display: flex; gap: 0;
  position: relative;
}

.step-line {
  display: flex; flex-direction: column; align-items: center;
  width: 40px; flex-shrink: 0;
}
.step-circle {
  width: 32px; height: 32px; border-radius: 50%;
  background: var(--color-primary-800);
  color: #fff; font-size: 13px; font-weight: 800;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0; z-index: 1;
}
.step-connector {
  width: 2px; flex: 1;
  background: var(--border);
  margin: 4px 0;
}
.step-item:last-child .step-connector { display: none; }

.step-content {
  flex: 1;
  padding: 4px 0 20px 16px;
}
.step-title { font-size: 14px; font-weight: 700; color: var(--text-primary); margin-bottom: 6px; margin-top: 5px; }
.step-desc  { font-size: 13px; color: var(--text-secondary); line-height: 1.7; }

/* ============================================================
   ALARM TABLE (报警信号表)
============================================================ */
.alarm-row {
  display: flex; align-items: center; gap: 14px;
  padding: 14px 20px;
  border-bottom: 1px solid var(--border-light);
  transition: background var(--transition);
}
.alarm-row:last-child { border-bottom: none; }
.alarm-row:hover { background: var(--color-gray-50); }
[data-theme="dark"] .alarm-row:hover { background: rgba(255,255,255,0.03); }

.alarm-indicator {
  width: 16px; height: 16px; border-radius: 50%;
  flex-shrink: 0;
  box-shadow: 0 0 8px currentColor;
}
.alarm-indicator.red    { background: #ef4444; color: #ef4444; }
.alarm-indicator.yellow { background: #f59e0b; color: #f59e0b; }
.alarm-indicator.green  { background: #10b981; color: #10b981; }
.alarm-indicator.blue   { background: #3b82f6; color: #3b82f6; }
.alarm-indicator.white  { background: #e2e8f0; color: #e2e8f0; }

.alarm-label {
  width: 100px; flex-shrink: 0;
  font-size: 13px; font-weight: 700; color: var(--text-primary);
}
.alarm-meaning { flex: 1; font-size: 13px; color: var(--text-secondary); }
.alarm-action  { font-size: 12px; color: var(--text-muted); }

/* ============================================================
   CALLOUT BLOCKS
============================================================ */
.callout {
  display: flex; align-items: flex-start; gap: 12px;
  padding: 14px 16px;
  border-radius: var(--radius-md);
  border-left: 3px solid;
  font-size: 13px; line-height: 1.7;
  margin: 12px 0;
}
.callout .ti { font-size: 17px; flex-shrink: 0; margin-top: 1px; }
.callout-content { flex: 1; }
.callout-label { font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 4px; }

.callout-master  { background: var(--color-accent-light); border-color: var(--color-accent); }
.callout-master .ti, .callout-master .callout-label { color: var(--color-accent); }

.callout-warning { background: var(--color-warning-bg); border-color: var(--color-warning); }
.callout-warning .ti, .callout-warning .callout-label { color: var(--color-warning); }

.callout-info    { background: var(--color-info-bg); border-color: var(--color-info); }
.callout-info .ti, .callout-info .callout-label { color: var(--color-info); }

.callout-success { background: var(--color-success-bg); border-color: var(--color-success); }
.callout-success .ti, .callout-success .callout-label { color: var(--color-success); }

.callout-danger  { background: var(--color-danger-bg); border-color: var(--color-danger); }
.callout-danger .ti, .callout-danger .callout-label { color: var(--color-danger); }

/* ============================================================
   TECH TAG
============================================================ */
.tech-tags { display: flex; flex-wrap: wrap; gap: 6px; margin: 8px 0; }
.tech-tag {
  font-size: 12px; font-weight: 600;
  padding: 4px 10px; border-radius: var(--radius-sm);
  background: var(--color-primary-50);
  color: var(--color-primary-700);
  border: 1px solid var(--color-primary-100);
}
[data-theme="dark"] .tech-tag { background: rgba(168,195,216,0.1); border-color: rgba(168,195,216,0.2); color: var(--sidebar-text); }
.tech-tag.orange { background: var(--color-accent-light); color: var(--color-accent); border-color: rgba(249,115,22,0.2); }
.tech-tag.green  { background: var(--color-success-bg); color: var(--color-success); border-color: rgba(13,148,136,0.2); }

/* ============================================================
   BULLET LIST (统一列表样式)
============================================================ */
.bullet-list { display: flex; flex-direction: column; gap: 8px; }
.bullet-item {
  display: flex; align-items: flex-start; gap: 10px;
  font-size: 13px; color: var(--text-secondary); line-height: 1.6;
}
.bullet-item .ti { font-size: 14px; color: var(--color-accent); flex-shrink: 0; margin-top: 2px; }
.bullet-item strong { color: var(--text-primary); }

/* ============================================================
   QUIZ SECTION
============================================================ */
.quiz-section {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
}
.quiz-header {
  display: flex; align-items: center; gap: 12px;
  padding: 18px 24px;
  background: var(--color-primary-800);
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.quiz-header-icon {
  width: 36px; height: 36px;
  background: rgba(249,115,22,0.2);
  border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
  border: 1px solid rgba(249,115,22,0.3);
}
.quiz-header-icon .ti { font-size: 20px; color: var(--color-accent); }
.quiz-header-title    { font-size: 16px; font-weight: 700; color: #fff; }
.quiz-header-subtitle { font-size: 12px; color: rgba(255,255,255,0.5); margin-top: 1px; }
.quiz-header-count    { margin-left: auto; font-size: 12px; color: rgba(255,255,255,0.4); }

.quiz-body { padding: 0 24px 24px; }

.quiz-sub-header {
  display: flex; align-items: center; gap: 8px;
  padding: 20px 0 12px;
  border-bottom: 1px solid var(--border-light);
  margin-bottom: 4px;
}
.quiz-sub-icon  { font-size: 16px; color: var(--color-primary-700); }
.quiz-sub-title { font-size: 13px; font-weight: 700; color: var(--text-primary); text-transform: uppercase; letter-spacing: 0.04em; }
.quiz-sub-count { font-size: 11px; color: var(--text-muted); margin-left: auto; }

.q-block {
  padding: 16px 0;
  border-bottom: 1px solid var(--border-light);
}
.q-block:last-of-type { border-bottom: none; }

.q-block-title {
  font-size: 14px; font-weight: 600;
  color: var(--text-primary);
  line-height: 1.6; margin-bottom: 12px;
}
.q-block-num {
  display: inline-flex; align-items: center; justify-content: center;
  width: 22px; height: 22px; border-radius: 50%;
  background: var(--color-primary-100);
  color: var(--color-primary-700);
  font-size: 11px; font-weight: 800;
  margin-right: 8px; flex-shrink: 0;
  vertical-align: middle;
}

.q-options { display: flex; flex-direction: column; gap: 8px; }
.q-option {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 14px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-md);
  cursor: pointer; transition: all var(--transition);
  font-size: 13px; color: var(--text-primary); user-select: none;
}
.q-option:hover { border-color: var(--color-accent); background: var(--color-accent-50); }
.q-option input[type="radio"], .q-option input[type="checkbox"] { display: none; }
.q-option-indicator {
  width: 18px; height: 18px; border-radius: 50%;
  border: 2px solid var(--border);
  background: var(--bg); flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  transition: all var(--transition);
}
.q-option[data-type="checkbox"] .q-option-indicator { border-radius: var(--radius-sm); }
.q-option.is-selected { border-color: var(--color-accent); background: var(--color-accent-50); }
.q-option.is-selected .q-option-indicator { background: var(--color-accent); border-color: var(--color-accent); }
.q-option.is-selected .q-option-indicator::after { content: ""; width: 7px; height: 7px; background: #fff; border-radius: 50%; }
.q-option[data-type="checkbox"].is-selected .q-option-indicator::after {
  content: "\ea5e"; font-family: "tabler-icons"; font-size: 12px;
  color: #fff; border-radius: 0; width: auto; height: auto;
}

.q-feedback {
  display: none;
  margin-top: 10px; padding: 10px 14px;
  border-radius: var(--radius-md);
  font-size: 13px; line-height: 1.6; border-left: 3px solid;
}
.q-feedback.is-correct {
  display: flex; align-items: flex-start; gap: 8px;
  background: var(--color-success-bg); border-color: var(--color-success); color: var(--text-primary);
}
.q-feedback.is-wrong {
  display: flex; align-items: flex-start; gap: 8px;
  background: var(--color-danger-bg); border-color: var(--color-danger); color: var(--text-primary);
}
.q-feedback .ti { font-size: 16px; flex-shrink: 0; margin-top: 1px; }
.q-feedback.is-correct .ti { color: var(--color-success); }
.q-feedback.is-wrong .ti   { color: var(--color-danger); }

.quiz-footer {
  padding: 20px 0 0;
  border-top: 1px solid var(--border-light);
  display: flex; align-items: center; gap: 14px;
}
.btn-submit-quiz {
  height: 40px; padding: 0 28px;
  background: var(--color-accent); color: #fff; border: none;
  border-radius: var(--radius-md);
  font-size: 14px; font-weight: 700;
  cursor: pointer; font-family: inherit;
  display: flex; align-items: center; gap: 8px;
  transition: background var(--transition), box-shadow var(--transition);
}
.btn-submit-quiz:hover { background: var(--color-accent-hover); box-shadow: 0 4px 12px rgba(249,115,22,0.35); }
.btn-submit-quiz .ti { font-size: 16px; }
.quiz-score { font-size: 14px; font-weight: 700; color: var(--text-primary); display: none; }
.quiz-score-good   { color: var(--color-success); }
.quiz-score-medium { color: var(--color-warning); }
.quiz-score-bad    { color: var(--color-danger); }

/* ============================================================
   PAGE NAVIGATION
============================================================ */
.page-nav {
  display: flex; align-items: stretch; gap: 14px;
  margin-top: 8px; padding-top: 20px;
  border-top: 1px solid var(--border);
}
.page-nav-btn {
  flex: 1; display: flex; align-items: center; gap: 12px;
  padding: 16px 20px;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-lg); cursor: pointer;
  transition: all var(--transition); text-decoration: none; color: inherit;
  box-shadow: var(--shadow-sm);
}
.page-nav-btn:hover { border-color: var(--color-accent); box-shadow: var(--shadow-md); }
.page-nav-btn.is-prev { flex-direction: row; }
.page-nav-btn.is-next { flex-direction: row-reverse; }
.page-nav-icon {
  width: 36px; height: 36px; background: var(--color-primary-50);
  border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0; color: var(--color-primary-700);
}
.page-nav-icon .ti { font-size: 18px; }
.page-nav-btn:hover .page-nav-icon { background: var(--color-accent); color: #fff; }
.page-nav-text  { flex: 1; }
.page-nav-label { font-size: 11px; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 3px; }
.page-nav-title { font-size: 13px; font-weight: 600; color: var(--text-primary); line-height: 1.4; }
.page-nav-btn.is-next .page-nav-text { text-align: right; }

/* ============================================================
   RESPONSIVE
============================================================ */
@media (max-width: 1100px) {
  .comparison-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  :root { --sidebar-width: 0px; }
  .sidebar { transform: translateX(-260px); }
  .sidebar.mobile-open { transform: translateX(0); width: 260px; }
  .main-layout { margin-left: 0; }
  .topbar { padding: 0 16px; }
  .topbar-search { display: none; }
  .page-content { padding: 16px; }
  .page-nav { flex-direction: column; }
  .mph-title { font-size: 18px; }
  .module-page-header { padding: 20px; }
}

/* ============================================================
   UTILITY
============================================================ */
.mt-0 { margin-top: 0 !important; }
.mb-0 { margin-bottom: 0 !important; }
.text-muted { color: var(--text-muted); }
.text-accent { color: var(--color-accent); }
.fw-700 { font-weight: 700; }