/* ============================================================
   base — 全站基础变量、重置与骨架
   ============================================================ */
:root {
  --color-primary: #E85D26;
  --color-bg: #FFF7F0;
  --color-text: #333333;
  --color-accent: #F2C9A8;
  --color-white: #FFFFFF;
  --color-border: #F0D9C6;
  --color-muted: #6B6B6B;
  --color-dark: #2A2A2A;
  --font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --container-width: 1200px;
  --header-height: 72px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 8px;
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --shadow-sm: 0 1px 3px rgba(51, 51, 51, 0.08);
  --shadow-md: 0 4px 12px rgba(51, 51, 51, 0.08);
  --shadow-hover: 0 8px 24px rgba(232, 93, 38, 0.12);
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: #C74E1E;
}

ul,
ol {
  list-style: none;
}

button {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
  background: none;
  border: none;
  cursor: pointer;
}

input,
textarea,
select {
  font-family: inherit;
  font-size: inherit;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-dark);
}

h1 {
  font-size: 32px;
}

h2 {
  font-size: 24px;
}

h3 {
  font-size: 18px;
}

p {
  margin-bottom: 12px;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ============================================================
   layout — 全站骨架布局：页头、页脚、主容器、面包屑
   ============================================================ */
.site-header {
  background-color: var(--color-white);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand-link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-shrink: 0;
}

.brand-name {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 0;
}

.brand-tagline {
  font-size: 13px;
  color: var(--color-muted);
  white-space: nowrap;
}

.main-nav {
  flex: 1;
  display: flex;
  justify-content: flex-end;
}

.nav-list {
  display: flex;
  gap: 8px;
  align-items: center;
}

.nav-item {
  position: relative;
}

.nav-group-label {
  display: block;
  padding: 10px 16px;
  font-size: 16px;
  font-weight: 500;
  color: var(--color-text);
  border-radius: var(--radius-sm);
  cursor: default;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.nav-item:hover .nav-group-label {
  color: var(--color-primary);
  background-color: var(--color-bg);
}

.nav-item.is-current .nav-group-label {
  color: var(--color-primary);
  font-weight: 600;
}

.nav-sub-list {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 160px;
  padding: 8px 0;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  z-index: 50;
}

.nav-item:hover .nav-sub-list,
.nav-item:focus-within .nav-sub-list {
  display: block;
}

.nav-sub-list li a {
  display: block;
  padding: 8px 16px;
  font-size: 14px;
  color: var(--color-text);
  white-space: nowrap;
}

.nav-sub-list li a:hover {
  background-color: var(--color-bg);
  color: var(--color-primary);
}

.menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 8px;
  border-radius: var(--radius-sm);
}

.menu-bar {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-text);
  border-radius: 2px;
  transition: transform var(--transition-normal), opacity var(--transition-fast);
}

.site-main {
  min-height: calc(100vh - var(--header-height) - 80px);
}

.inner-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 32px 24px 64px;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--color-muted);
  margin-bottom: 16px;
}

.breadcrumb a {
  color: var(--color-muted);
}

.breadcrumb a:hover {
  color: var(--color-primary);
}

.breadcrumb-sep {
  color: var(--color-accent);
}

.breadcrumb-current {
  color: var(--color-text);
  font-weight: 500;
}

.page-header {
  margin-bottom: 24px;
}

.page-title {
  font-size: 32px;
  font-weight: 700;
  color: var(--color-dark);
  line-height: 1.3;
}

.page-intro {
  font-size: 16px;
  color: var(--color-muted);
  margin-bottom: 32px;
  max-width: 760px;
}

.site-footer {
  background-color: var(--color-white);
  border-top: 1px solid var(--color-border);
  padding: 24px 0;
}

.footer-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}

.footer-brand {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.footer-brand-name {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-primary);
}

.footer-brand-desc {
  font-size: 13px;
  color: var(--color-muted);
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-link {
  font-size: 14px;
  color: var(--color-muted);
}

.footer-link:hover {
  color: var(--color-primary);
}

.copyright {
  font-size: 13px;
  color: var(--color-muted);
  margin: 0;
}

/* ============================================================
   components — 通用组件：卡片、列表、FAQ、侧栏、相关链接
   ============================================================ */
.section-header {
  margin-bottom: 28px;
  text-align: center;
}

.section-header h2 {
  font-size: 26px;
  margin-bottom: 8px;
}

.section-subtitle {
  font-size: 15px;
  color: var(--color-muted);
  max-width: 560px;
  margin: 0 auto;
}

.section-title {
  font-size: 22px;
  margin-bottom: 16px;
}

.section-desc {
  font-size: 15px;
  color: var(--color-muted);
  margin-bottom: 24px;
}

/* 通用卡片 */
.capability-card,
.theme-card,
.guide-card,
.topic-item,
.related-topic-card,
.term-card,
.related-card,
.sidebar-block {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: box-shadow var(--transition-normal), transform var(--transition-normal);
}

.capability-card:hover,
.theme-card:hover,
.guide-card:hover,
.topic-item:hover,
.related-topic-card:hover,
.term-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-4px);
}

/* FAQ 手风琴 */
.faq-item {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  overflow: hidden;
}

.faq-item summary {
  padding: 16px 20px;
  font-size: 16px;
  font-weight: 500;
  color: var(--color-dark);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  position: relative;
  padding-right: 48px;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 22px;
  font-weight: 400;
  color: var(--color-primary);
  transition: transform var(--transition-fast);
}

.faq-item[open] summary::after {
  content: "−";
}

.faq-item[open] summary {
  border-bottom: 1px solid var(--color-border);
}

.faq-answer {
  padding: 16px 20px;
  font-size: 15px;
  color: var(--color-muted);
  line-height: 1.7;
}

.faq-answer p {
  margin-bottom: 8px;
}

.faq-answer a {
  font-weight: 500;
  display: inline-block;
  margin-top: 4px;
}

/* 相关链接区块 */
.related-links {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
}

.related-links-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-dark);
}

.related-links-item {
  font-size: 14px;
  color: var(--color-primary);
  padding: 6px 14px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: 20px;
  transition: background-color var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
}

.related-links-item:hover {
  background-color: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary);
}

/* 侧栏通用 */
.sidebar-block {
  padding: 24px;
  margin-bottom: 24px;
}

.sidebar-title {
  font-size: 18px;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--color-bg);
}

.sidebar-links,
.aside-link-list,
.related-list,
.category-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.sidebar-links a,
.aside-link-list a,
.related-list a,
.category-list a {
  display: block;
  padding: 8px 12px;
  font-size: 14px;
  color: var(--color-text);
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast), color var(--transition-fast), padding-left var(--transition-fast);
}

.sidebar-links a:hover,
.aside-link-list a:hover,
.related-list a:hover,
.category-list a:hover {
  background-color: var(--color-bg);
  color: var(--color-primary);
  padding-left: 16px;
}

/* ============================================================
   pages — 首页
   ============================================================ */
.home-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px 64px;
}

/* 首屏服务导航选择器 */
.hero-selector {
  display: grid;
  grid-template-columns: 1fr 400px;
  gap: 48px;
  align-items: center;
  padding: 64px 0 56px;
}

.hero-text h1 {
  font-size: 36px;
  line-height: 1.3;
  margin-bottom: 16px;
}

.hero-intro {
  font-size: 16px;
  color: var(--color-muted);
  max-width: 520px;
  line-height: 1.7;
}

.selector-panel {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-md);
}

.problem-tabs {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  margin-bottom: 24px;
}

.problem-tab {
  padding: 10px 8px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-muted);
  background-color: var(--color-bg);
  border-radius: var(--radius-sm);
  text-align: center;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.problem-tab.active {
  background-color: var(--color-primary);
  color: var(--color-white);
}

.service-dimensions {
  min-height: 200px;
}

.dimension-panel {
  display: none;
}

.dimension-panel.active {
  display: block;
  animation: fadeIn var(--transition-normal);
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.panel-title {
  font-size: 18px;
  margin-bottom: 16px;
  color: var(--color-primary);
}

.dimension-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.dimension-list li {
  display: flex;
  align-items: baseline;
  gap: 8px;
  font-size: 15px;
  padding: 8px 12px;
  background-color: var(--color-bg);
  border-radius: var(--radius-sm);
}

.dimension-label {
  font-weight: 600;
  color: var(--color-dark);
  flex-shrink: 0;
}

.dimension-desc {
  color: var(--color-muted);
}

.hero-media {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.hero-media img {
  width: 100%;
  height: 360px;
  object-fit: cover;
}

/* 服务能力总览 */
.service-overview {
  padding: 48px 0;
}

.capability-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.capability-card {
  padding: 32px 28px;
  text-align: center;
}

.capability-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 16px;
  border-radius: 50%;
  background-color: var(--color-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.capability-icon img {
  width: 32px;
  height: 32px;
  object-fit: contain;
}

.capability-title {
  font-size: 18px;
  margin-bottom: 10px;
}

.capability-desc {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.7;
  margin: 0;
}

/* 服务主题卡片 */
.theme-cards {
  padding: 48px 0;
}

.theme-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.theme-card {
  display: block;
  padding: 28px;
  text-decoration: none;
  color: var(--color-text);
}

.theme-name {
  font-size: 18px;
  margin-bottom: 10px;
  color: var(--color-dark);
}

.theme-desc {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.7;
  margin-bottom: 12px;
}

.theme-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-primary);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.theme-link::after {
  content: "→";
  transition: transform var(--transition-fast);
}

.theme-card:hover .theme-link::after {
  transform: translateX(4px);
}

/* 精选专题 */
.featured-topics {
  padding: 48px 0;
}

.topic-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.topic-item {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 24px;
  padding: 20px;
}

.topic-media {
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.topic-media img {
  width: 100%;
  height: 160px;
  object-fit: cover;
}

.topic-content {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.topic-title {
  font-size: 18px;
  margin-bottom: 8px;
}

.topic-excerpt {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.7;
  margin-bottom: 12px;
}

.topic-link {
  font-size: 14px;
  font-weight: 500;
  align-self: flex-start;
}

/* 指南入口 */
.guide-entry {
  padding: 48px 0;
}

.guide-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.guide-card {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 28px;
  text-decoration: none;
  color: var(--color-text);
  position: relative;
}

.guide-icon {
  width: 56px;
  height: 56px;
  flex-shrink: 0;
  border-radius: var(--radius-sm);
  background-color: var(--color-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.guide-icon img {
  width: 28px;
  height: 28px;
  object-fit: contain;
}

.guide-text {
  flex: 1;
}

.guide-title {
  font-size: 18px;
  margin-bottom: 6px;
}

.guide-desc {
  font-size: 14px;
  color: var(--color-muted);
  margin: 0;
  line-height: 1.6;
}

.guide-arrow {
  font-size: 20px;
  color: var(--color-accent);
  transition: transform var(--transition-fast), color var(--transition-fast);
}

.guide-card:hover .guide-arrow {
  transform: translateX(4px);
  color: var(--color-primary);
}

/* 合作流程 */
.cooperation-process {
  padding: 48px 0;
}

.process-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.process-step {
  text-align: center;
  padding: 24px 16px;
  position: relative;
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background-color: var(--color-primary);
  color: var(--color-white);
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 16px;
}

.step-title {
  font-size: 16px;
  margin-bottom: 8px;
}

.step-desc {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.6;
  margin: 0;
}

/* FAQ 预览 */
.faq-preview {
  padding: 48px 0;
}

.faq-preview .faq-list {
  max-width: 800px;
  margin: 0 auto 24px;
}

.faq-view-all {
  display: block;
  width: fit-content;
  margin: 0 auto;
  padding: 10px 32px;
  background-color: var(--color-primary);
  color: var(--color-white);
  font-size: 15px;
  font-weight: 500;
  border-radius: 24px;
  transition: background-color var(--transition-fast);
}

.faq-view-all:hover {
  background-color: #C74E1E;
  color: var(--color-white);
}

/* ============================================================
   pages — 服务主题页
   ============================================================ */
.page-layout.sidebar-left {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 32px;
  align-items: start;
}

.page-sidebar {
  position: sticky;
  top: calc(var(--header-height) + 24px);
}

.page-content {
  min-width: 0;
}

.theme-list {
  display: flex;
  flex-direction: column;
  gap: 24px;
  margin-bottom: 48px;
}

.theme-list .theme-card {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 24px;
  padding: 0;
  overflow: hidden;
}

.theme-media {
  overflow: hidden;
  border-radius: 0;
}

.theme-media img {
  width: 100%;
  height: 100%;
  min-height: 160px;
  object-fit: cover;
}

.theme-body {
  padding: 24px;
  min-width: 0;
}

.theme-body .theme-name {
  font-size: 20px;
  margin-bottom: 12px;
}

.theme-detail {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.theme-detail p {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.7;
  margin: 0;
}

.theme-detail p strong {
  color: var(--color-dark);
  font-weight: 600;
  margin-right: 4px;
}

/* 服务主题页底部指南入口 */
.guide-entry .guide-links {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.guide-link-item {
  display: block;
  padding: 24px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: box-shadow var(--transition-normal), transform var(--transition-normal);
}

.guide-link-item:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
}

.guide-link-name {
  display: block;
  font-size: 17px;
  font-weight: 600;
  color: var(--color-dark);
  margin-bottom: 6px;
}

.guide-link-desc {
  font-size: 14px;
  color: var(--color-muted);
}

/* ============================================================
   pages — 基础指南页
   ============================================================ */
.article-page {
  max-width: 860px;
}

.article-intro {
  font-size: 16px;
  color: var(--color-muted);
  line-height: 1.8;
  margin-bottom: 40px;
  padding: 24px;
  background-color: var(--color-white);
  border-left: 4px solid var(--color-primary);
  border-radius: var(--radius-sm);
}

.article-section {
  margin-bottom: 48px;
}

.article-section h2 {
  font-size: 24px;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--color-bg);
}

.article-section p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-text);
  margin-bottom: 16px;
}

.article-figure {
  margin: 24px 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
}

.article-figure img {
  width: 100%;
  height: 320px;
  object-fit: cover;
}

/* 步骤列表 */
.step-list {
  counter-reset: step-counter;
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin: 20px 0;
}

.step-list li {
  counter-increment: step-counter;
  display: flex;
  gap: 16px;
  align-items: flex-start;
  padding: 16px 20px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.step-list li::before {
  content: counter(step-counter);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  flex-shrink: 0;
  border-radius: 50%;
  background-color: var(--color-primary);
  color: var(--color-white);
  font-size: 15px;
  font-weight: 600;
}

.step-list li p {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
}

/* 要点块 */
.point-block {
  padding: 20px 24px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: 16px;
}

.point-block p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
}

/* ============================================================
   pages — 进阶方案页
   ============================================================ */
.page-layout:not(.sidebar-left) {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 32px;
  align-items: start;
}

.page-layout .container {
  min-width: 0;
}

.article-content {
  min-width: 0;
}

.article-intro {
  font-size: 16px;
  color: var(--color-muted);
  line-height: 1.8;
  margin-bottom: 32px;
}

.article-section {
  margin-bottom: 40px;
}

.article-section h2 {
  font-size: 22px;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-bg);
}

.article-section p {
  font-size: 15px;
  line-height: 1.8;
  margin-bottom: 16px;
}

.article-aside {
  position: sticky;
  top: calc(var(--header-height) + 24px);
}

.media-figure {
  margin-bottom: 24px;
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
}

.media-figure img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.media-figure figcaption {
  padding: 10px 16px;
  font-size: 13px;
  color: var(--color-muted);
  background-color: var(--color-bg);
}

.related-topic-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-top: 20px;
}

.related-topic-card {
  padding: 20px;
}

.related-topic-card h3 {
  font-size: 16px;
  margin-bottom: 8px;
}

.related-topic-card p {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.6;
  margin: 0 0 12px;
}

.related-topic-card a {
  font-size: 14px;
  font-weight: 500;
}

/* ============================================================
   pages — 术语库页
   ============================================================ */
.page-intro {
  display: flex;
  flex-direction: column;
  gap: 24px;
  margin-bottom: 32px;
}

.intro-desc {
  font-size: 15px;
  color: var(--color-muted);
  line-height: 1.8;
}

.intro-media {
  border-radius: var(--radius-md);
  overflow: hidden;
}

.intro-media img {
  width: 100%;
  height: 240px;
  object-fit: cover;
}

.glossary-index {
  margin-bottom: 40px;
}

.index-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 20px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.index-nav a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text);
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.index-nav a:hover {
  background-color: var(--color-primary);
  color: var(--color-white);
}

.glossary-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 48px;
}

.term-card {
  padding: 24px;
}

.term-name {
  font-size: 18px;
  margin-bottom: 12px;
  color: var(--color-primary);
}

.term-def {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text);
  margin-bottom: 12px;
}

.term-scene,
.term-related {
  font-size: 13px;
  line-height: 1.6;
  color: var(--color-muted);
  margin-bottom: 8px;
}

.term-scene strong,
.term-related strong {
  color: var(--color-dark);
  font-weight: 600;
}

.related-reading {
  margin-top: 40px;
}

.related-reading .related-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  padding: 20px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.related-reading .related-links a {
  padding: 8px 20px;
  font-size: 14px;
  color: var(--color-primary);
  background-color: var(--color-bg);
  border-radius: 20px;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.related-reading .related-links a:hover {
  background-color: var(--color-primary);
  color: var(--color-white);
}

/* ============================================================
   pages — 专题解读页
   ============================================================ */
.layout-shell {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 32px;
  align-items: start;
}

.main-content {
  min-width: 0;
}

.topic-block {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 24px;
  padding: 24px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: 24px;
}

.topic-media {
  overflow: hidden;
  border-radius: var(--radius-sm);
}

.topic-figure {
  margin: 0;
}

.topic-figure img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.topic-figure figcaption {
  padding: 8px 0;
  font-size: 13px;
  color: var(--color-muted);
}

.topic-body {
  min-width: 0;
}

.topic-body h2 {
  font-size: 20px;
  margin-bottom: 12px;
}

.topic-summary {
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-muted);
  margin-bottom: 16px;
}

.topic-insight {
  margin-bottom: 16px;
}

.topic-insight h3 {
  font-size: 15px;
  margin: 12px 0 6px;
  color: var(--color-dark);
}

.topic-insight p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-muted);
  margin-bottom: 8px;
}

.topic-link {
  display: inline-block;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-primary);
  margin-top: 8px;
}

.sidebar-area {
  position: sticky;
  top: calc(var(--header-height) + 24px);
}

.related-card {
  padding: 24px;
  margin-bottom: 24px;
}

.related-card .sidebar-title {
  font-size: 18px;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--color-bg);
}

.related-item {
  margin-bottom: 4px;
}

.related-item a {
  display: block;
  padding: 8px 12px;
  font-size: 14px;
  color: var(--color-text);
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.related-item a:hover {
  background-color: var(--color-bg);
  color: var(--color-primary);
}

/* ============================================================
   pages — 常见问题页
   ============================================================ */
.faq-heading {
  margin-bottom: 24px;
}

.faq-intro {
  font-size: 15px;
  color: var(--color-muted);
  line-height: 1.8;
}

.faq-categories {
  display: flex;
  gap: 12px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.faq-cat-btn {
  padding: 10px 24px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-muted);
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: 24px;
  transition: background-color var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
}

.faq-cat-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.faq-cat-btn.is-active {
  background-color: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary);
}

.faq-list {
  max-width: 800px;
}

.content-media-inline {
  margin-top: 24px;
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
}

.content-media-inline img {
  width: 100%;
  height: 280px;
  object-fit: cover;
}

.content-media-inline figcaption {
  padding: 10px 16px;
  font-size: 13px;
  color: var(--color-muted);
  background-color: var(--color-bg);
}

.faq-sidebar {
  position: sticky;
  top: calc(var(--header-height) + 24px);
}

/* ============================================================
   pages — 404 页
   ============================================================ */
.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - var(--header-height) - 80px);
  padding: 48px 24px;
}

.error-content {
  text-align: center;
  max-width: 560px;
}

.error-code {
  font-size: 96px;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: 16px;
  display: block;
}

.error-content h1 {
  font-size: 28px;
  margin-bottom: 16px;
}

.error-desc {
  font-size: 16px;
  color: var(--color-muted);
  margin-bottom: 32px;
}

.error-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  margin-bottom: 32px;
}

.btn-back-home,
.btn-view-service {
  display: inline-block;
  padding: 12px 32px;
  font-size: 15px;
  font-weight: 500;
  border-radius: 24px;
  transition: background-color var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
}

.btn-back-home {
  background-color: var(--color-primary);
  color: var(--color-white);
}

.btn-back-home:hover {
  background-color: #C74E1E;
  color: var(--color-white);
}

.btn-view-service {
  background-color: var(--color-white);
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
}

.btn-view-service:hover {
  background-color: var(--color-primary);
  color: var(--color-white);
}

.error-help {
  font-size: 14px;
  color: var(--color-muted);
}

.error-help a {
  font-weight: 500;
}

/* ============================================================
   responsive — 响应式断点
   ============================================================ */
@media (max-width: 1024px) {
  .hero-selector {
    grid-template-columns: 1fr 340px;
    gap: 32px;
  }

  .topic-block {
    grid-template-columns: 220px 1fr;
  }

  .glossary-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-layout.sidebar-left {
    grid-template-columns: 240px 1fr;
    gap: 24px;
  }

  .page-layout:not(.sidebar-left),
  .layout-shell {
    grid-template-columns: 1fr 280px;
    gap: 24px;
  }
}

@media (max-width: 768px) {
  .header-inner {
    height: 60px;
    padding: 0 16px;
  }

  .brand-tagline {
    display: none;
  }

  .menu-toggle {
    display: flex;
  }

  .main-nav {
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    background-color: var(--color-white);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
    display: none;
  }

  .main-nav.is-open {
    display: block;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    padding: 16px;
    gap: 4px;
  }

  .nav-group-label {
    padding: 12px 16px;
    font-size: 15px;
  }

  .nav-sub-list {
    display: block;
    position: static;
    box-shadow: none;
    border: none;
    padding: 0 0 4px 16px;
    min-width: 0;
  }

  .nav-sub-list li a {
    padding: 8px 16px;
    font-size: 14px;
  }

  .inner-main {
    padding: 24px 16px 48px;
  }

  .home-main {
    padding: 0 16px 48px;
  }

  .page-title {
    font-size: 26px;
  }

  .hero-selector {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 40px 0;
  }

  .hero-text h1 {
    font-size: 28px;
  }

  .hero-media img {
    height: 240px;
  }

  .capability-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .theme-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .topic-item {
    grid-template-columns: 1fr;
  }

  .topic-media img {
    height: 200px;
  }

  .guide-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .process-steps {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }

  .page-layout.sidebar-left,
  .page-layout:not(.sidebar-left),
  .layout-shell {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .page-sidebar,
  .article-aside,
  .sidebar-area,
  .faq-sidebar {
    position: static;
    order: 2;
    margin-top: 32px;
  }

  .page-content,
  .main-content,
  .article-content {
    order: 1;
  }

  .theme-list .theme-card {
    grid-template-columns: 1fr;
  }

  .theme-media img {
    height: 200px;
  }

  .guide-entry .guide-links {
    grid-template-columns: 1fr;
  }

  .glossary-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .index-nav a {
    width: 40px;
    height: 40px;
  }

  .topic-block {
    grid-template-columns: 1fr;
  }

  .topic-figure img {
    height: 220px;
  }

  .related-topic-cards {
    grid-template-columns: 1fr;
  }

  .footer-inner {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }

  .footer-links {
    gap: 16px;
    flex-wrap: wrap;
    justify-content: center;
  }

  .article-figure img {
    height: 220px;
  }

  .content-media-inline img {
    height: 200px;
  }

  .error-code {
    font-size: 72px;
  }

  .error-actions {
    flex-direction: column;
    align-items: center;
  }

  .btn-back-home,
  .btn-view-service {
    width: 200px;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .process-steps {
    grid-template-columns: 1fr;
  }

  .hero-text h1 {
    font-size: 24px;
  }

  .selector-panel {
    padding: 16px;
  }

  .problem-tabs {
    grid-template-columns: repeat(2, 1fr);
  }

  .topic-item {
    padding: 16px;
  }

  .capability-card {
    padding: 24px 20px;
  }

  .faq-item summary {
    padding: 14px 16px;
    padding-right: 44px;
    font-size: 15px;
  }

  .faq-answer {
    padding: 14px 16px;
    font-size: 14px;
  }

  .page-title {
    font-size: 24px;
  }

  .section-header h2 {
    font-size: 22px;
  }

  .topic-block {
    padding: 16px;
  }

  .theme-body {
    padding: 16px;
  }
}