/* =========================================================
   base — 全局基础样式
   ========================================================= */
:root {
  --bg: #F8FAFC;
  --card: #FFFFFF;
  --primary: #0F3D5C;
  --secondary: #377795;
  --accent: #D97706;
  --border: #E2E8F0;
  --text: #1E293B;
  --text-muted: #64748B;
  --radius: 8px;
  --shadow-sm: 0 1px 3px rgba(15, 61, 92, 0.08);
  --shadow-md: 0 4px 12px rgba(15, 61, 92, 0.10);
  --shadow-lg: 0 8px 24px rgba(15, 61, 92, 0.12);
  --container: 1180px;
  --header-h: 68px;
  --font: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}

*,
*::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);
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  background-color: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: var(--secondary);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

ul,
ol {
  list-style: none;
}

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

h1,
h2,
h3,
h4 {
  line-height: 1.4;
  color: var(--text);
}

h1 {
  font-size: 32px;
  font-weight: 700;
}

h2 {
  font-size: 24px;
  font-weight: 600;
}

h3 {
  font-size: 20px;
  font-weight: 600;
}

p {
  margin-bottom: 1em;
}

p:last-child {
  margin-bottom: 0;
}

/* =========================================================
   layout — 全站布局骨架
   ========================================================= */
.site-body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background-color: var(--bg);
}

.site-inner {
  flex: 1 0 auto;
  width: 100%;
}

.site-main {
  flex: 1 0 auto;
  width: 100%;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--card);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

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

/* 页脚 */
.site-footer {
  background-color: var(--primary);
  color: rgba(255, 255, 255, 0.85);
  margin-top: auto;
}

.footer-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 48px 24px 32px;
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr;
  gap: 40px;
}

.footer-col p {
  color: rgba(255, 255, 255, 0.75);
  font-size: 14px;
  line-height: 1.7;
}

.footer-heading {
  font-size: 15px;
  font-weight: 600;
  color: #fff;
  margin-bottom: 12px;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.75);
  font-size: 14px;
  transition: color 0.2s ease;
}

.footer-links a:hover {
  color: #fff;
}

.footer-update {
  margin-top: 12px;
}

.footer-update a {
  color: rgba(255, 255, 255, 0.75);
  font-size: 14px;
}

.footer-update a:hover {
  color: #fff;
}

.footer-compliance {
  margin-top: 12px;
  font-size: 12px;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.55);
}

/* 面包屑 */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  margin-bottom: 24px;
  color: var(--text-muted);
}

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

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

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

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

.breadcrumb-nav {
  max-width: var(--container);
  margin: 0 auto;
  padding: 16px 24px 0;
}

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

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

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

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

/* 页头标题区 */
.page-header {
  margin-bottom: 32px;
}

.page-title {
  font-size: 28px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--text);
  margin-bottom: 0;
}

.page-heading {
  margin-bottom: 32px;
}

/* 通用 section 标题 */
.section-title {
  font-size: 24px;
  font-weight: 600;
  margin-bottom: 24px;
  color: var(--text);
}

/* 通用文本链接 */
.text-link {
  display: inline-block;
  font-weight: 500;
  color: var(--secondary);
  margin-top: 16px;
}

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

/* 相关链接 */
.related-links {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 32px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}

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

.related-links-item {
  font-size: 14px;
  color: var(--secondary);
}

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

/* 双栏布局：主内容 + 右侧辅助栏 */
.page-layout {
  display: grid;
  grid-template-columns: minmax(0, 2fr) minmax(0, 1fr);
  gap: 40px;
  align-items: start;
}

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

/* 侧栏 */
.side-bar,
.aside-bar {
  min-width: 0;
}

.aside-card,
.support-note {
  background-color: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
}

.aside-card h2,
.support-note h2,
.aside-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--text);
}

.aside-card p,
.support-note p,
.aside-text {
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.aside-card p:last-child,
.support-note p:last-child,
.aside-text:last-child {
  margin-bottom: 0;
}

.aside-links {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.aside-links a {
  font-size: 14px;
  color: var(--secondary);
}

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

/* =========================================================
   components — 通用组件
   ========================================================= */

/* 品牌 */
.brand {
  flex-shrink: 0;
}

.brand-link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  text-decoration: none;
}

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

.brand-tag {
  font-size: 12px;
  color: var(--text-muted);
  padding-left: 8px;
  border-left: 1px solid var(--border);
  line-height: 1.4;
}

/* 主导航 */
.main-nav {
  display: flex;
  align-items: center;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-link {
  display: inline-block;
  padding: 8px 14px;
  font-size: 15px;
  font-weight: 500;
  color: var(--text-muted);
  border-radius: 4px;
  transition: color 0.2s ease, background-color 0.2s ease;
  min-height: 44px;
  line-height: 28px;
}

.nav-link:hover {
  color: var(--primary);
  background-color: rgba(15, 61, 92, 0.05);
}

.nav-link.is-current {
  color: var(--primary);
  font-weight: 600;
  background-color: rgba(15, 61, 92, 0.08);
}

/* 汉堡按钮 */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  border-radius: 4px;
}

.toggle-bar {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--primary);
  border-radius: 2px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

/* 按钮 */
.btn-primary,
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 24px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius);
  transition: box-shadow 0.2s ease, background-color 0.2s ease, color 0.2s ease;
}

.btn-primary {
  background-color: var(--primary);
  color: #fff;
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  background-color: #0a2e46;
  color: #fff;
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background-color: transparent;
  color: var(--primary);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  border-color: var(--primary);
  color: var(--primary);
  box-shadow: var(--shadow-sm);
}

/* 表格 */
.table-wrapper,
.table-wrap {
  overflow-x: auto;
  background-color: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}

.comparison-table,
.compare-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  line-height: 1.6;
}

.comparison-table th,
.comparison-table td,
.compare-table th,
.compare-table td {
  padding: 14px 16px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--border);
}

.comparison-table thead th,
.compare-table thead th {
  background-color: var(--primary);
  color: #fff;
  font-weight: 600;
  white-space: nowrap;
}

.comparison-table tbody th,
.compare-table tbody th {
  background-color: #F1F5F9;
  color: var(--text);
  font-weight: 600;
  white-space: nowrap;
  min-width: 120px;
}

.comparison-table tbody tr:last-child td,
.comparison-table tbody tr:last-child th,
.compare-table tbody tr:last-child td,
.compare-table tbody tr:last-child th {
  border-bottom: none;
}

.comparison-table tbody tr:hover,
.compare-table tbody tr:hover {
  background-color: rgba(15, 61, 92, 0.03);
}

/* 图片容器通用约束 */
figure {
  margin: 0;
}

figure img {
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius);
}

figcaption {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.6;
  margin-top: 8px;
  text-align: center;
}

/* 内容图片 */
.content-media {
  margin: 32px 0;
}

.content-media img {
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}

.content-media-primary {
  margin: 0;
}

.content-media-inline {
  margin: 32px auto;
  max-width: 720px;
}

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

/* hero */
.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  gap: 48px;
  align-items: center;
  padding: 64px 0 56px;
}

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

.hero-title {
  font-size: 32px;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 16px;
  color: var(--text);
}

.hero-subtitle {
  font-size: 16px;
  line-height: 1.75;
  color: var(--text-muted);
  margin-bottom: 28px;
  max-width: 520px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.hero-media {
  min-width: 0;
}

.hero-figure {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border);
  background-color: var(--card);
}

.hero-figure img {
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

/* 核心服务速览 */
.service-strip {
  margin-bottom: 64px;
}

.service-strip .section-title {
  font-size: 24px;
  margin-bottom: 24px;
}

.strip-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}

.service-card {
  background-color: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.2s ease, transform 0.2s ease;
}

.service-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.card-icon {
  font-size: 28px;
  line-height: 1;
  margin-bottom: 16px;
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  background-color: rgba(15, 61, 92, 0.08);
  border-radius: var(--radius);
}

.card-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
}

.card-text {
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-muted);
}

/* 服务矩阵 */
.service-matrix {
  margin-bottom: 64px;
}

.matrix-list {
  background-color: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.matrix-item {
  display: grid;
  grid-template-columns: 200px minmax(0, 1fr);
  gap: 24px;
  padding: 20px 24px;
  border-bottom: 1px solid var(--border);
  align-items: baseline;
}

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

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

.matrix-desc {
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-muted);
}

/* 合作方式对比表 */
.comparison {
  margin-bottom: 64px;
}

/* 合作流程预览 */
.process-preview {
  margin-bottom: 64px;
}

.timeline-horizontal {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 24px;
  margin-bottom: 16px;
}

.timeline-item {
  background-color: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  position: relative;
}

.timeline-step {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  background-color: var(--primary);
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  border-radius: 50%;
  margin-bottom: 12px;
}

.timeline-title {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 8px;
}

.timeline-desc {
  font-size: 14px;
  line-height: 1.6;
  color: var(--text-muted);
}

/* FAQ 预览 */
.faq-preview {
  margin-bottom: 64px;
}

.accordion-preview {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 16px;
}

.accordion-item {
  background-color: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.accordion-item summary {
  padding: 16px 20px;
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  min-height: 44px;
}

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

.accordion-item summary::after {
  content: "+";
  font-size: 20px;
  color: var(--secondary);
  flex-shrink: 0;
}

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

.accordion-item p {
  padding: 0 20px 16px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-muted);
}

/* CTA 引导区 */
.cta-section {
  background-color: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 48px 32px;
  text-align: center;
  box-shadow: var(--shadow-sm);
  margin-bottom: 32px;
}

.cta-title {
  font-size: 24px;
  font-weight: 600;
  margin-bottom: 12px;
}

.cta-text {
  font-size: 15px;
  color: var(--text-muted);
  max-width: 560px;
  margin: 0 auto 24px;
}

.cta-actions {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
}

/* =========================================================
   pages — 服务能力页
   ========================================================= */
.page-service .page-layout {
  display: grid;
  grid-template-columns: minmax(0, 2fr) minmax(0, 1fr);
  gap: 40px;
  align-items: start;
}

.page-service .site-main {
  min-width: 0;
}

.service-intro p {
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  margin-bottom: 32px;
}

.service-matrix-list {
  margin-bottom: 48px;
}

.service-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.service-item {
  background-color: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow-sm);
}

.service-item h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
}

.service-audience {
  font-size: 13px;
  color: var(--accent);
  font-weight: 500;
  margin-bottom: 8px;
}

.service-item p:last-child {
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-muted);
}

.service-comparison {
  margin-bottom: 48px;
}

.service-comparison > p {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.service-figure {
  margin: 32px 0;
}

.service-figure img {
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

/* 侧栏支持说明 */
.support-note p a {
  color: var(--secondary);
  font-weight: 500;
}

.support-note p a:hover {
  color: var(--primary);
}

/* =========================================================
   pages — 适用场景页
   ========================================================= */
.scenario-intro {
  margin-bottom: 40px;
}

.scenario-intro p {
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  margin-bottom: 24px;
}

.scenario-hero-image {
  margin: 24px 0 0;
}

.scenario-hero-image img {
  aspect-ratio: 16 / 7;
  object-fit: cover;
}

.scenario-cards {
  margin-bottom: 48px;
}

.scenario-cards h2 {
  font-size: 24px;
  margin-bottom: 24px;
}

.scenario-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}

.scenario-card {
  background-color: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
}

.scenario-card h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 12px;
}

.scenario-card > p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.scenario-needs {
  margin-bottom: 20px;
  flex: 1;
}

.scenario-needs li {
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-muted);
  padding-left: 20px;
  position: relative;
  margin-bottom: 6px;
}

.scenario-needs li::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 10px;
  width: 6px;
  height: 6px;
  background-color: var(--secondary);
  border-radius: 50%;
}

.scenario-entry {
  display: inline-block;
  font-size: 14px;
  font-weight: 600;
  color: var(--secondary);
  min-height: 44px;
  line-height: 44px;
}

.scenario-entry:hover {
  color: var(--primary);
}

.scenario-comparison {
  margin-bottom: 48px;
}

.scenario-comparison > p {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 16px;
}

/* =========================================================
   pages — 合作流程页
   ========================================================= */
.flow-intro {
  margin-bottom: 40px;
}

.intro-text {
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  margin-bottom: 16px;
}

.flow-timeline {
  margin-bottom: 48px;
}

.timeline-steps {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 24px;
}

.timeline-steps .timeline-item {
  background-color: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow-sm);
}

.step-marker {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background-color: var(--primary);
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  border-radius: 50%;
  margin-bottom: 12px;
}

.step-content h3 {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 8px;
}

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

.step-owner,
.step-deliverable {
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.step-owner strong,
.step-deliverable strong {
  color: var(--text);
  font-weight: 600;
}

.flow-comparison {
  margin-bottom: 48px;
}

.section-desc {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.flow-figure {
  margin: 32px 0;
}

.flow-figure img {
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

/* =========================================================
   pages — 常见问题页
   ========================================================= */
.faq-intro {
  margin-bottom: 32px;
}

.faq-intro p {
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
}

.faq-accordion {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 48px;
}

.faq-item {
  background-color: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.faq-item summary {
  padding: 18px 24px;
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  min-height: 44px;
}

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

.faq-item summary::after {
  content: "+";
  font-size: 20px;
  color: var(--secondary);
  flex-shrink: 0;
}

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

.faq-answer {
  padding: 0 24px 20px;
}

.faq-answer p {
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-muted);
}

.faq-support {
  margin-bottom: 48px;
}

.faq-media {
  margin-bottom: 32px;
}

.faq-media img {
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.support-cards {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}

.support-card {
  background-color: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
}

.support-card h2 {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 8px;
}

.support-card p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-muted);
  margin-bottom: 16px;
  flex: 1;
}

.support-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--secondary);
  min-height: 44px;
  line-height: 44px;
  display: inline-block;
}

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

/* =========================================================
   pages — 关于我们页
   ========================================================= */
.page-about .page-layout {
  display: grid;
  grid-template-columns: minmax(0, 2fr) minmax(0, 1fr);
  gap: 40px;
  align-items: start;
}

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

.about-intro {
  margin-bottom: 40px;
}

.about-intro h2 {
  font-size: 24px;
  margin-bottom: 16px;
}

.about-intro p {
  font-size: 15px;
  line-height: 1.75;
  color: var(--text);
  margin-bottom: 16px;
}

.about-figure {
  margin-top: 24px;
}

.about-image {
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.about-principles {
  margin-bottom: 40px;
}

.about-principles h2 {
  font-size: 24px;
  margin-bottom: 16px;
}

.principles-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.principles-list li {
  background-color: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 20px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text);
  box-shadow: var(--shadow-sm);
}

.about-boundaries {
  margin-bottom: 40px;
}

.about-boundaries h2 {
  font-size: 24px;
  margin-bottom: 16px;
}

.about-boundaries p {
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-muted);
  margin-bottom: 12px;
}

/* =========================================================
   pages — 404 / 未找到页
   ========================================================= */
.error-main {
  max-width: var(--container);
  margin: 0 auto;
  padding: 64px 24px;
  flex: 1 0 auto;
  width: 100%;
}

.error-message {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 48px;
}

.error-code {
  font-size: 72px;
  font-weight: 700;
  color: var(--primary);
  line-height: 1;
  margin-bottom: 16px;
}

.error-lead {
  font-size: 20px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 12px;
}

.error-desc {
  font-size: 15px;
  color: var(--text-muted);
  margin-bottom: 12px;
}

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

.error-home {
  display: inline-block;
  margin-top: 24px;
  min-height: 44px;
  line-height: 44px;
  padding: 0 24px;
  background-color: var(--primary);
  color: #fff;
  border-radius: var(--radius);
  font-weight: 600;
}

.error-home:hover {
  background-color: #0a2e46;
  color: #fff;
}

.return-links {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
  max-width: 800px;
  margin: 0 auto;
}

.return-card {
  display: block;
  background-color: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.2s ease, transform 0.2s ease;
  text-decoration: none;
}

.return-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.return-title {
  display: block;
  font-size: 17px;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 8px;
}

.return-text,
.return-desc {
  display: block;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-muted);
}

.return-link {
  display: inline-block;
  font-size: 14px;
  font-weight: 600;
  color: var(--secondary);
  margin-top: 8px;
  min-height: 44px;
  line-height: 44px;
}

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

.notfound-note {
  max-width: 640px;
  margin: 48px auto 0;
  text-align: center;
}

.notfound-note p {
  font-size: 14px;
  color: var(--text-muted);
}

/* 404.html 专用 */
.site-error .error-main {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

.site-error .return-card {
  text-align: center;
}

/* =========================================================
   responsive — 响应式
   ========================================================= */

/* 平板及以下 */
@media (max-width: 1024px) {
  .page-layout,
  .page-service .page-layout,
  .page-about .page-layout {
    grid-template-columns: minmax(0, 1fr);
    gap: 32px;
  }

  .side-bar,
  .aside-bar {
    order: 2;
  }

  .page-service .site-main,
  .page-about .content-area {
    order: 1;
  }

  .timeline-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .hero {
    gap: 32px;
    padding: 48px 0 40px;
  }
}

/* 手机端 */
@media (max-width: 768px) {
  .header-inner {
    padding: 0 16px;
  }

  .nav-toggle {
    display: flex;
  }

  .main-nav {
    position: static;
  }

  .nav-list {
    display: none;
    position: absolute;
    top: var(--header-h);
    left: 0;
    right: 0;
    background-color: var(--card);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-md);
    flex-direction: column;
    align-items: stretch;
    padding: 8px 16px;
    gap: 0;
    z-index: 99;
  }

  .nav-list.is-open {
    display: flex;
  }

  .nav-link {
    display: block;
    padding: 12px 16px;
    border-radius: 4px;
    font-size: 15px;
  }

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

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

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 40px 16px 24px;
  }

  .breadcrumb-nav {
    padding: 12px 16px 0;
  }

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

  h1 {
    font-size: 26px;
  }

  h2 {
    font-size: 22px;
  }

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

  .hero-title {
    font-size: 28px;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-actions .btn-primary,
  .hero-actions .btn-secondary {
    width: 100%;
  }

  /* 服务速览 */
  .strip-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  /* 矩阵 */
  .matrix-item {
    grid-template-columns: 1fr;
    gap: 8px;
    padding: 16px;
  }

  /* 时间线 */
  .timeline-horizontal {
    grid-template-columns: 1fr;
    gap: 16px;
  }

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

  /* 场景 */
  .scenario-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  /* 支持卡片 */
  .support-cards {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  /* 返回入口 */
  .return-links {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  /* CTA */
  .cta-section {
    padding: 32px 20px;
  }

  .cta-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .cta-actions .btn-primary,
  .cta-actions .btn-secondary {
    width: 100%;
  }

  /* 表格横向滚动保持可用 */
  .table-wrapper,
  .table-wrap {
    -webkit-overflow-scrolling: touch;
  }

  /* 面包屑换行保护 */
  .breadcrumb {
    flex-wrap: wrap;
    row-gap: 4px;
  }

  /* 相关链接 */
  .related-links {
    gap: 12px;
  }
}

/* 超小屏保护 */
@media (max-width: 390px) {
  .brand-tag {
    display: none;
  }

  .header-inner {
    gap: 12px;
  }

  .nav-link {
    font-size: 14px;
    padding: 10px 12px;
  }

  .matrix-item {
    padding: 14px;
  }

  .service-card,
  .scenario-card,
  .support-card,
  .return-card {
    padding: 20px 16px;
  }

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

  .faq-answer {
    padding: 0 16px 16px;
  }
}

/* 打印时隐藏导航与按钮 */
@media print {
  .site-header,
  .nav-toggle,
  .hero-actions,
  .cta-section,
  .related-links {
    display: none !important;
  }

  body {
    background-color: #fff;
  }

  .site-main.inner-main,
  .home-main {
    padding: 0;
    max-width: 100%;
  }
}