/* ============================================
   文明跃迁理论体系 - 统一样式 v5.0
   ============================================ */

/* CSS变量定义 - 严格色彩系统 */
:root {
  /* 基础背景色 */
  --bg: #0B1220;
  --bg-2: #111A2B;
  --card: #162338;
  
  /* 文字排版系统 */
  --text: #E8EDF5;
  --text-2: #B7C2D3;
  --text-3: #8C98AA;
  
  /* 强调色 */
  --accent: #C8A96B;
  --accent-hover: #D4B87A;
  
  /* 功能标签专属色 */
  --risk: #C96A6A;
  --opp: #6FAE8B;
  --leap: #6E8FD8;
  --eternity: #8E7BC7;
  
  /* 边框与阴影 */
  --border: rgba(255, 255, 255, 0.08);
  --border-soft: rgba(255, 255, 255, 0.06);
  --border-strong: rgba(255, 255, 255, 0.16);
  --shadow: rgba(0, 0, 0, 0.3);
  
  /* 间距 */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2.5rem;
  --space-xl: 4rem;
  --space-2xl: 6rem;
  
  /* 圆角 */
  --radius: 16px;
  --radius-sm: 8px;
  
  /* 字体 */
  --font-cn: "PingFang SC", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --font-en: "Inter", "Helvetica Neue", Arial, sans-serif;
}

/* 重置样式 */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-cn);
  background: linear-gradient(180deg, var(--bg) 0%, #0d1526 50%, var(--bg-2) 100%);
  background-attachment: fixed;
  color: var(--text);
  line-height: 1.8;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--text-2);
  text-decoration: none;
  transition: color 0.3s ease;
}

a:hover {
  color: var(--accent);
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 500;
  line-height: 1.4;
  color: var(--text);
}

p {
  color: var(--text-2);
  margin-bottom: 1rem;
}

ul, ol {
  list-style: none;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* ============================================
   按钮样式
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  font-size: 0.9rem;
  font-family: var(--font-cn);
  font-weight: 400;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.3s ease;
  border: 1px solid transparent;
  background-color: transparent;
}

.btn-primary {
  color: var(--accent);
  border-color: var(--accent);
}

.btn-primary:hover {
  background-color: rgba(200, 169, 107, 0.1);
  color: var(--accent);
}

.btn-secondary {
  color: var(--text-2);
  border-color: var(--border);
}

.btn-secondary:hover {
  border-color: var(--border-strong);
  color: var(--text);
}

/* ============================================
   导航栏
   ============================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background-color: rgba(11, 18, 32, 0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--space-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-logo {
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--text);
  white-space: nowrap;
}

.nav-logo span {
  color: var(--accent);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.15rem;
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.nav-links::-webkit-scrollbar {
  display: none;
}

.nav-link {
  padding: 0.5rem 0.7rem;
  font-size: 14px;
  color: var(--text-2);
  white-space: nowrap;
  border-radius: 4px;
  transition: all 0.2s ease;
}

.nav-link:hover,
.nav-link.active {
  color: var(--text);
  background-color: rgba(200, 169, 107, 0.06);
}

.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 0.5rem;
  background: none;
  border: none;
}

.menu-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--text-2);
  transition: all 0.3s ease;
}

/* ============================================
   页面主体
   ============================================ */
.page-content {
  padding-top: 64px;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.section {
  padding: var(--space-xl) 0;
}

.section-alt {
  background-color: var(--bg-2);
}

/* ============================================
   Hero区域
   ============================================ */
.hero {
  min-height: calc(100vh - 64px);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: var(--space-xl) var(--space-md);
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--border);
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(ellipse at center, rgba(200, 169, 107, 0.04) 0%, transparent 60%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 850px;
}

.hero-title {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 500;
  margin-bottom: var(--space-sm);
  letter-spacing: 0.02em;
  line-height: 1.2;
}

.hero-subtitle {
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  color: var(--text-2);
  margin-bottom: var(--space-lg);
  font-weight: 400;
  letter-spacing: 0.05em;
}

.hero-intro {
  font-size: 1rem;
  color: var(--text-3);
  line-height: 2;
  max-width: 800px;
  margin: 0 auto var(--space-lg);
}

.hero-actions {
  display: flex;
  gap: var(--space-sm);
  justify-content: center;
  flex-wrap: wrap;
}

/* ============================================
   页面标题区
   ============================================ */
.page-header {
  padding: var(--space-xl) 0 var(--space-lg);
  text-align: center;
  border-bottom: 1px solid var(--border);
}

.page-title {
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  margin-bottom: var(--space-sm);
}

.page-subtitle {
  font-size: 1.1rem;
  color: var(--text-2);
  max-width: 700px;
  margin: 0 auto;
}

/* ============================================
   文明跃迁体系总图
   ============================================ */
.system-map {
  padding: var(--space-xl) 0;
  border-bottom: 1px solid var(--border);
}

.system-map-title {
  text-align: center;
  font-size: 1rem;
  color: var(--text-3);
  margin-bottom: var(--space-lg);
  font-weight: 400;
  letter-spacing: 0.05em;
}

.flow-container {
  max-width: 850px;
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.flow-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-bottom: 14px;
}

.flow-node {
  padding: 10px 16px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.02);
  font-size: 14px;
  color: var(--text-2);
  white-space: nowrap;
  transition: all 0.2s ease;
}

.flow-node:hover {
  border-color: var(--border-strong);
  background: rgba(255, 255, 255, 0.04);
}

.flow-node.center {
  border-color: rgba(110, 143, 216, 0.35);
  background: rgba(110, 143, 216, 0.08);
  color: var(--text);
}

.flow-node.highlight {
  border-color: rgba(200, 169, 107, 0.35);
  background: rgba(200, 169, 107, 0.06);
}

.flow-arrow {
  color: var(--text-3);
  font-size: 14px;
  opacity: 0.5;
}

.flow-divider {
  text-align: center;
  color: var(--text-3);
  font-size: 12px;
  margin: 6px 0;
  opacity: 0.4;
}

/* ============================================
   模块卡片
   ============================================ */
.modules-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--space-md);
}

.module-card {
  background: linear-gradient(180deg, rgba(255,255,255,0.03), rgba(255,255,255,0.015));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-md);
  transition: all 0.2s ease;
}

.module-card:hover {
  border-color: var(--border-strong);
  transform: translateY(-2px);
}

.module-header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-sm);
}

.module-number {
  font-size: 0.7rem;
  color: var(--accent);
  font-family: var(--font-en);
  letter-spacing: 0.1em;
  opacity: 0.8;
}

.module-title {
  font-size: 1.15rem;
  font-weight: 500;
  line-height: 1.4;
}

.module-desc {
  color: var(--text-2);
  font-size: 0.9rem;
  line-height: 1.8;
  margin-bottom: var(--space-md);
}

.module-actions {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.module-collapsed {
  opacity: 0.75;
  background: rgba(255, 255, 255, 0.015);
}

.module-badge {
  display: inline-block;
  padding: 0.2rem 0.5rem;
  font-size: 0.65rem;
  color: var(--text-3);
  background-color: rgba(140, 152, 170, 0.08);
  border-radius: 4px;
  margin-left: auto;
}

/* ============================================
   内容区块
   ============================================ */
.content-section {
  padding: var(--space-lg) 0;
}

.content-section + .content-section {
  border-top: 1px solid var(--border);
}

.section-title {
  font-size: 1.5rem;
  margin-bottom: var(--space-md);
  color: var(--text);
}

.section-intro {
  color: var(--text-2);
  font-size: 1rem;
  line-height: 1.9;
  margin-bottom: var(--space-lg);
  max-width: 800px;
}

.subsection {
  margin: var(--space-md) 0;
  padding: var(--space-md);
  background-color: var(--card);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--accent);
}

.subsection-title {
  font-size: 1.1rem;
  margin-bottom: var(--space-sm);
  color: var(--text);
}

.subsection-content {
  color: var(--text-2);
  font-size: 0.95rem;
  line-height: 1.9;
}

.bullet-list {
  list-style: none;
  padding: 0;
}

.bullet-list li {
  position: relative;
  padding-left: 1.5rem;
  margin-bottom: 0.75rem;
  color: var(--text-2);
  line-height: 1.8;
}

.bullet-list li::before {
  content: '•';
  position: absolute;
  left: 0;
  color: var(--accent);
}

/* ============================================
   结构链条
   ============================================ */
.structure-chain {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--space-xs);
  padding: var(--space-lg);
  background-color: var(--card);
  border-radius: var(--radius-sm);
  margin: var(--space-md) 0;
}

.chain-item {
  padding: 0.5rem 1rem;
  background-color: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 0.9rem;
  color: var(--text);
}

.chain-arrow {
  color: var(--accent);
  font-size: 1.2rem;
}

/* ============================================
   文档区
   ============================================ */
.documents-section {
  background-color: var(--card);
  padding: var(--space-lg);
  border-radius: var(--radius-sm);
  margin-top: var(--space-lg);
}

.documents-title {
  font-size: 1.1rem;
  margin-bottom: var(--space-md);
  color: var(--accent);
}

.document-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-sm) 0;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.document-item:last-child {
  border-bottom: none;
}

.document-info {
  flex: 1;
  min-width: 200px;
}

.document-name {
  font-size: 0.95rem;
  color: var(--text);
  margin-bottom: 0.25rem;
}

.document-desc {
  font-size: 0.85rem;
  color: var(--text-3);
}

/* ============================================
   文档库
   ============================================ */
.library-controls {
  display: flex;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
  flex-wrap: wrap;
}

.search-box {
  flex: 1;
  min-width: 250px;
  position: relative;
}

.search-box input {
  width: 100%;
  padding: 0.75rem 1rem;
  padding-left: 2.5rem;
  background-color: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-family: var(--font-cn);
  font-size: 0.9rem;
  transition: border-color 0.3s ease;
}

.search-box input:focus {
  outline: none;
  border-color: var(--accent);
}

.search-box input::placeholder {
  color: var(--text-3);
}

.search-icon {
  position: absolute;
  left: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-3);
  font-size: 1rem;
}

.filter-tabs {
  display: flex;
  gap: var(--space-xs);
  flex-wrap: wrap;
}

.filter-tab {
  padding: 0.5rem 1rem;
  font-size: 0.85rem;
  color: var(--text-2);
  background-color: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.3s ease;
  font-family: var(--font-cn);
}

.filter-tab:hover,
.filter-tab.active {
  color: var(--accent);
  border-color: var(--accent);
  background-color: rgba(200, 169, 107, 0.08);
}

.library-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--space-md);
}

.library-card {
  background: linear-gradient(180deg, rgba(255,255,255,0.03), rgba(255,255,255,0.015));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-md);
  transition: all 0.2s ease;
}

.library-card:hover {
  border-color: var(--border-strong);
  transform: translateY(-2px);
}

.library-card.hidden {
  display: none;
}

.library-card-header {
  margin-bottom: var(--space-sm);
}

.library-card-title {
  font-size: 1rem;
  margin-bottom: 0.4rem;
  line-height: 1.4;
}

.library-card-desc {
  font-size: 0.85rem;
  color: var(--text-3);
  line-height: 1.7;
}

.library-card-tags {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
  margin-bottom: var(--space-sm);
}

.tag {
  padding: 0.2rem 0.5rem;
  font-size: 0.7rem;
  color: var(--text-3);
  background-color: rgba(255, 255, 255, 0.04);
  border-radius: 4px;
  border: 1px solid var(--border-soft);
}

/* 功能标签专属色 */
.tag.risk {
  color: var(--risk);
  background-color: rgba(201, 106, 106, 0.08);
  border-color: rgba(201, 106, 106, 0.15);
}

.tag.opp {
  color: var(--opp);
  background-color: rgba(111, 174, 139, 0.08);
  border-color: rgba(111, 174, 139, 0.15);
}

.tag.leap {
  color: var(--leap);
  background-color: rgba(110, 143, 216, 0.08);
  border-color: rgba(110, 143, 216, 0.15);
}

.tag.eternity {
  color: var(--eternity);
  background-color: rgba(142, 123, 199, 0.08);
  border-color: rgba(142, 123, 199, 0.15);
}

.library-actions {
  display: flex;
  gap: var(--space-sm);
  margin-top: var(--space-lg);
  justify-content: center;
}

/* ============================================
   过渡文案区
   ============================================ */
.transition-section {
  text-align: center;
  padding: var(--space-xl) var(--space-md);
  background-color: var(--bg-2);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.transition-title {
  font-size: 1.5rem;
  margin-bottom: var(--space-md);
}

.transition-text {
  color: var(--text-2);
  max-width: 800px;
  margin: 0 auto;
  line-height: 2;
}

/* ============================================
   页脚
   ============================================ */
.footer {
  padding: var(--space-xl) 0;
  border-top: 1px solid var(--border);
  text-align: center;
}

.footer-content {
  color: var(--text-3);
  font-size: 0.85rem;
}

.footer-domain {
  color: var(--accent);
  margin-top: var(--space-sm);
}

/* ============================================
   辅助类
   ============================================ */
.text-center {
  text-align: center;
}

.text-accent {
  color: var(--accent);
}

.text-muted {
  color: var(--text-3);
}

.mt-lg {
  margin-top: var(--space-lg);
}

.mb-lg {
  margin-bottom: var(--space-lg);
}

.hidden {
  display: none;
}

/* ============================================
   6. 新增深化组件样式 (Visualization, Wargaming, Meta)
   ============================================ */

/* 通用辅助类 */
.mb-1 { margin-bottom: 1rem; }
.mt-1 { margin-top: 1rem; }

/* 贡献值文明/COS 可视化流转组件 */
.cvs-flow {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  padding: 20px;
  border: 1px dashed var(--border-soft);
  border-radius: var(--radius);
  background: rgba(0,0,0,0.1);
  border-color: rgba(111,174,139,0.3);
}

.flow-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.flow-node {
  padding: 8px 14px;
  border-radius: 8px;
  border: 1px solid var(--border);
  color: var(--text-2);
  font-size: 13px;
  background: rgba(255,255,255,0.02);
}

.flow-node.center-hub {
  border-color: var(--opp);
  color: var(--text);
  background: rgba(111, 174, 139, 0.1);
  font-weight: 500;
}

.flow-arrow {
  color: var(--opp);
  font-size: 14px;
  opacity: 0.8;
}

/* Wargaming 兵棋博弈推演组件 */
.wargame-visual {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 20px;
  border: 1px dashed var(--border-soft);
  border-radius: var(--radius);
  background: rgba(0,0,0,0.1);
  border-color: rgba(201,106,106,0.3);
}

.wargame-branch {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 10px;
  border-radius: 8px;
  border: 1px solid transparent;
}

.wargame-branch.zerosum {
  background: rgba(201,106,106,0.05);
  border-color: rgba(201,106,106,0.15);
}

.wargame-branch.cooperation {
  background: rgba(111,174,139,0.05);
  border-color: rgba(111,174,139,0.15);
}

.wargame-branch .decision {
  font-size: 13px;
  color: var(--text-2);
}

.wargame-branch .outcome {
  font-size: 14px;
  font-weight: 500;
  margin-left: 12px;
}

.wargame-branch .outcome.risk {
  color: var(--risk);
}

.wargame-branch .outcome.opp {
  color: var(--opp);
}

/* 文档元数据 */
.doc-meta {
  font-size: 13px;
  color: var(--text-3);
}

.doc-meta span {
  margin-right: 8px;
}

/* ============================================
   7. 新增组件样式（可视化总图、二维码、订阅）
   ============================================ */

/* 文明跃迁体系总图 - 新版可视化 */
.civitas-frame {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.civitas-main-title {
  font-size: 1.5rem;
  font-weight: 600;
  text-align: center;
  margin-bottom: var(--space-lg);
  color: var(--text);
}

.flow-card-new {
  background: linear-gradient(180deg, rgba(255,255,255,0.03), rgba(255,255,255,0.015));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-lg);
}

.flow-section-new {
  margin-bottom: var(--space-lg);
}

.flow-section-new:last-child {
  margin-bottom: 0;
}

.flow-section-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--leap);
  margin-bottom: var(--space-sm);
}

.flow-path-new {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px 14px;
  margin: var(--space-sm) 0;
}

.flow-node-new {
  background: rgba(255,255,255,0.02);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 16px;
  font-size: 14px;
  white-space: nowrap;
  color: var(--text-2);
  transition: all 0.2s ease;
}

.flow-node-new:hover {
  background: rgba(255,255,255,0.04);
  border-color: var(--border-strong);
}

.flow-arrow-new {
  font-size: 16px;
  color: var(--text-3);
}

.flow-note-new {
  font-size: 13px;
  color: var(--text-3);
  padding-left: 4px;
}

/* 核心目标高亮 */
.core-target .flow-node-new {
  background: rgba(200, 169, 107, 0.08);
  border-color: rgba(200, 169, 107, 0.25);
  color: var(--accent);
  font-weight: 500;
}

.core-target .flow-node-new:hover {
  background: rgba(200, 169, 107, 0.12);
}

/* 高阶虚线框 */
.advanced-box {
  border: 1px dashed var(--border);
  border-radius: var(--radius-sm);
  padding: var(--space-md);
  background: rgba(255,255,255,0.01);
}

.advanced-tag {
  display: inline-block;
  background: rgba(140, 152, 170, 0.08);
  color: var(--text-3);
  font-size: 12px;
  padding: 3px 10px;
  border-radius: 6px;
  margin-bottom: var(--space-sm);
}

/* 公众号二维码区域 */
.qr-section {
  text-align: center;
  padding: var(--space-lg) 0;
}

.qr-placeholder {
  width: 180px;
  height: 180px;
  margin: 0 auto var(--space-sm);
  background: rgba(255,255,255,0.03);
  border: 1px dashed var(--border);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-3);
  font-size: 14px;
}

.qr-title {
  font-size: 18px;
  font-weight: 500;
  margin-bottom: var(--space-xs);
  color: var(--text);
}

.qr-desc {
  font-size: 14px;
  color: var(--text-3);
}

/* 订阅表单 */
.subscribe-form {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
  margin-top: var(--space-md);
}

.subscribe-form input {
  flex: 1;
  min-width: 250px;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.02);
  color: var(--text);
  font-family: var(--font-cn);
  font-size: 14px;
}

.subscribe-form input::placeholder {
  color: var(--text-3);
}

.subscribe-form input:focus {
  outline: none;
  border-color: var(--accent);
}

/* 留言板 */
.message-form {
  margin-top: var(--space-md);
}

.message-form textarea {
  width: 100%;
  height: 120px;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.02);
  color: var(--text);
  font-family: var(--font-cn);
  font-size: 14px;
  resize: vertical;
}

.message-form textarea::placeholder {
  color: var(--text-3);
}

.message-form textarea:focus {
  outline: none;
  border-color: var(--accent);
}

/* 图标按钮 */
.btn-icon {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

/* 响应式调整 */
@media (max-width: 768px) {
  .flow-path-new {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .flow-arrow-new {
    transform: rotate(90deg);
  }
  
  .subscribe-form {
    flex-direction: column;
  }
  
  .subscribe-form input {
    width: 100%;
  }
}

/* 可视化卡片 */
.visualization-card {
  grid-column: span 2;
}

/* 兵棋推演卡片 */
.wargame-card {
  border-color: rgba(201,106,106,0.3);
}

/* 问题堆叠布局 */
.problem-stack {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-bottom: 24px;
}

/* ============================================
   响应式设计
   ============================================ */
@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background-color: var(--bg);
    flex-direction: column;
    padding: var(--space-md);
    gap: var(--space-xs);
    border-bottom: 1px solid var(--border);
    transform: translateY(-150%);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    max-height: 80vh;
    overflow-y: auto;
  }
  
  .nav-links.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
  
  .nav-link {
    width: 100%;
    text-align: center;
    padding: 0.75rem;
    font-size: 15px;
  }
  
  .menu-toggle {
    display: flex;
  }
  
  .hero {
    padding: var(--space-lg) var(--space-md);
    min-height: auto;
  }
  
  .hero-title {
    font-size: 1.8rem;
  }
  
  .hero-subtitle {
    font-size: 1rem;
  }
  
  .hero-intro {
    font-size: 0.95rem;
    line-height: 1.9;
  }
  
  .page-title {
    font-size: 1.6rem;
  }
  
  .modules-grid {
    grid-template-columns: 1fr;
  }
  
  .module-card {
    padding: var(--space-sm);
  }
  
  .structure-chain {
    flex-direction: column;
    padding: var(--space-md);
  }
  
  .chain-arrow {
    transform: rotate(90deg);
  }
  
  .library-controls {
    flex-direction: column;
  }
  
  .hero-actions,
  .module-actions {
    flex-direction: column;
  }
  
  .btn {
    width: 100%;
    min-height: 46px;
  }
  
  .flow-row {
    gap: 8px;
  }
  
  .flow-node {
    padding: 8px 12px;
    font-size: 13px;
  }
  
  .section {
    padding: var(--space-lg) 0;
  }
  
  .document-item {
    flex-direction: column;
    align-items: flex-start;
  }
  
  /* 新增组件响应式 */
  .cvs-flow {
    flex-direction: column;
    gap: 10px;
  }
  
  .flow-group {
    width: 100%;
  }
  
  .visualization-card {
    grid-column: span 1;
  }
  
  .problem-stack {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  :root {
    --space-lg: 1.25rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
  }
  
  .hero-title {
    font-size: 1.6rem;
  }
  
  h2 {
    font-size: 1.35rem;
  }
  
  .section-title {
    font-size: 1.2rem;
  }
  
  .page-header {
    padding: var(--space-lg) 0 var(--space-md);
  }
  
  .container {
    padding: 0 var(--space-sm);
  }
}