/* =========================================================
   base - 基础变量、重置与全局字体
   ========================================================= */
:root {
  --color-primary: #16697a;
  --color-accent: #ff7e67;
  --color-warning: #f2c94c;
  --color-bg: #f9f8f6;
  --color-heading: #243b53;
  --color-text: #637381;
  --color-text-light: #8296a7;
  --color-white: #ffffff;
  --color-line: #e6e8eb;
  --font-size-base: 16px;
  --font-size-small: 14px;
  --font-size-large: 18px;
  --container-width: 1200px;
  --radius: 8px;
  --shadow: 0 2px 8px rgba(36, 59, 83, 0.08);
  --header-height: 72px;
  --font-stack: -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
}

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

html {
  font-size: var(--font-size-base);
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-stack);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

body.font-size-small {
  --font-size-base: 14px;
}

body.font-size-large {
  --font-size-base: 18px;
}

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

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

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

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 700;
  color: var(--color-heading);
  line-height: 1.35;
}

h1 {
  font-size: 1.75rem;
}

h2 {
  font-size: 1.5rem;
}

h3 {
  font-size: 1.125rem;
}

h4 {
  font-size: 1rem;
}

p {
  margin-bottom: 0.75rem;
}

button {
  font-family: inherit;
  font-size: var(--font-size-small);
  cursor: pointer;
  border: none;
  background: none;
}

/* =========================================================
   layout - 全站布局骨架
   ========================================================= */
.site-header {
  background-color: var(--color-white);
  border-bottom: 1px solid var(--color-line);
  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: center;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-heading);
}

.brand-name {
  color: var(--color-primary);
}

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

.inner-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 32px 24px 64px;
  width: 100%;
}

.site-footer {
  background-color: var(--color-heading);
  color: rgba(255, 255, 255, 0.85);
  flex-shrink: 0;
}

.footer-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 24px 24px;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
}

.footer-brand-name {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 12px;
}

.footer-brand-desc {
  font-size: 0.875rem;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.7);
}

.footer-links-title {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-white);
  margin-bottom: 16px;
}

.footer-link-list li {
  margin-bottom: 8px;
}

.footer-link-list a {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.875rem;
  transition: color 0.2s ease;
}

.footer-link-list a:hover {
  color: var(--color-warning);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  padding: 16px 24px;
  text-align: center;
}

.copyright {
  font-size: 0.8125rem;
  color: rgba(255, 255, 255, 0.5);
  margin: 0;
}

/* =========================================================
   components - 通用组件
   ========================================================= */
/* 导航 */
.main-nav .nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-item {
  position: relative;
}

.nav-link {
  display: block;
  padding: 8px 12px;
  font-size: var(--font-size-small);
  color: var(--color-heading);
  border-radius: 4px;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.nav-link:hover,
.nav-link.is-current {
  color: var(--color-primary);
  background-color: rgba(22, 105, 122, 0.08);
}

.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 160px;
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: 6px;
  box-shadow: var(--shadow);
  padding: 8px 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s;
  z-index: 10;
}

.has-dropdown:hover .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-menu li a {
  display: block;
  padding: 8px 16px;
  font-size: 0.875rem;
  color: var(--color-text);
}

.dropdown-menu li a:hover {
  color: var(--color-primary);
  background-color: rgba(22, 105, 122, 0.06);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.font-size-toggle {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid var(--color-line);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.875rem;
  color: var(--color-heading);
  background-color: var(--color-white);
  transition: border-color 0.2s ease, color 0.2s ease;
}

.font-size-toggle:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  border-radius: 6px;
}

.nav-toggle-bar {
  width: 22px;
  height: 2px;
  background-color: var(--color-heading);
  border-radius: 1px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  font-size: var(--font-size-small);
  font-weight: 600;
  border-radius: var(--radius);
  transition: background-color 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
}

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

.btn-primary:hover {
  background-color: #0f5563;
  color: var(--color-white);
  box-shadow: 0 4px 12px rgba(22, 105, 122, 0.2);
}

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

.btn-secondary:hover {
  background-color: rgba(22, 105, 122, 0.06);
}

/* 卡片链接 */
.card-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-primary);
}

.card-link::after {
  content: "→";
  transition: transform 0.2s ease;
}

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

/* 面包屑 */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8125rem;
  margin-bottom: 24px;
  color: var(--color-text-light);
}

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

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

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

.breadcrumb-current {
  color: var(--color-heading);
}

.breadcrumb-list {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8125rem;
}

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

.faq-question {
  padding: 16px 20px;
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-heading);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  list-style: none;
  transition: color 0.2s ease;
}

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

.faq-question::after {
  content: "+";
  font-size: 1.25rem;
  color: var(--color-primary);
  flex-shrink: 0;
  transition: transform 0.2s ease;
}

.faq-item[open] .faq-question::after {
  transform: rotate(45deg);
}

.faq-question:hover {
  color: var(--color-primary);
}

.faq-answer {
  padding: 0 20px 16px;
  font-size: 0.9375rem;
  color: var(--color-text);
  line-height: 1.7;
}

/* 相关链接 */
.related-links {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--color-line);
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px 16px;
}

.related-links-label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-heading);
}

.related-links-item {
  font-size: 0.875rem;
  color: var(--color-primary);
  padding: 4px 8px;
  border-radius: 4px;
  background-color: rgba(22, 105, 122, 0.06);
}

.related-links-item:hover {
  background-color: rgba(22, 105, 122, 0.12);
}

/* 返回顶部 */
.back-to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background-color: var(--color-primary);
  color: var(--color-white);
  font-size: 1.25rem;
  display: none;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 12px rgba(22, 105, 122, 0.3);
  z-index: 50;
  transition: background-color 0.2s ease, transform 0.2s ease;
}

.back-to-top::before {
  content: "↑";
}

.back-to-top:hover {
  background-color: #0f5563;
  transform: translateY(-2px);
}

.back-to-top.is-visible {
  display: flex;
}

/* 页面标题区 */
.page-header {
  margin-bottom: 16px;
}

.page-title {
  font-size: 1.875rem;
  font-weight: 700;
  color: var(--color-heading);
}

.page-title-area {
  margin-bottom: 32px;
}

.page-lead,
.page-intro,
.page-title-desc {
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-text);
  max-width: 720px;
}

/* 侧栏布局 */
.page-layout {
  width: 100%;
}

.sidebar-left {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: 40px;
  align-items: start;
}

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

.sidebar-title,
.sidebar-inner .sidebar-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-heading);
  padding-bottom: 12px;
  border-bottom: 2px solid var(--color-primary);
  margin-bottom: 16px;
}

.sidebar-nav,
.sidebar-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.sidebar-nav li a,
.sidebar-list li a {
  display: block;
  padding: 10px 14px;
  font-size: 0.9375rem;
  color: var(--color-text);
  border-radius: 6px;
  border-left: 3px solid transparent;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.sidebar-nav li a:hover,
.sidebar-list li a:hover {
  background-color: rgba(22, 105, 122, 0.06);
  color: var(--color-primary);
  border-left-color: var(--color-primary);
}

.sidebar-note {
  margin-top: 24px;
  padding: 16px;
  background-color: rgba(242, 201, 76, 0.12);
  border-radius: var(--radius);
  font-size: 0.875rem;
  line-height: 1.6;
}

.sidebar-note-title {
  font-weight: 700;
  color: var(--color-heading);
  margin-bottom: 8px;
}

.sidebar-note a {
  display: inline-block;
  margin-top: 8px;
  font-weight: 600;
}

/* =========================================================
   pages - 首页
   ========================================================= */
/* Hero */
.hero-section {
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-line);
}

.hero-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 64px 24px;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
}

.hero-tagline {
  display: inline-block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-accent);
  background-color: rgba(255, 126, 103, 0.1);
  padding: 4px 12px;
  border-radius: 4px;
  margin-bottom: 16px;
}

.hero-title {
  font-size: 2.25rem;
  line-height: 1.3;
  margin-bottom: 16px;
}

.hero-desc {
  font-size: 1.0625rem;
  line-height: 1.7;
  margin-bottom: 24px;
  max-width: 520px;
}

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

.hero-media {
  position: relative;
}

.hero-figure {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 8px 24px rgba(36, 59, 83, 0.12);
}

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

/* 区块通用 */
.section-block {
  padding: 64px 0;
  border-bottom: 1px solid var(--color-line);
}

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

.section-header {
  margin-bottom: 40px;
  max-width: 640px;
}

.section-kicker {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-accent);
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

.section-title {
  font-size: 1.75rem;
  margin-bottom: 12px;
}

.section-desc {
  font-size: 1rem;
  line-height: 1.7;
}

/* 服务卡片 */
.services-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.service-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 32px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.service-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(36, 59, 83, 0.1);
}

.service-card-icon {
  width: 48px;
  height: 48px;
  border-radius: 8px;
  background-color: rgba(22, 105, 122, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 16px;
  color: var(--color-primary);
}

.service-card-title {
  font-size: 1.125rem;
  margin-bottom: 8px;
}

.service-card-text {
  font-size: 0.9375rem;
  line-height: 1.6;
  margin-bottom: 16px;
}

/* 场景方案 */
.scenarios-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.scenario-block {
  background-color: var(--color-white);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--color-line);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.scenario-block:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(36, 59, 83, 0.1);
}

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

.scenario-body {
  padding: 24px;
}

.scenario-title {
  font-size: 1.125rem;
  margin-bottom: 8px;
}

.scenario-text {
  font-size: 0.9375rem;
  line-height: 1.6;
  margin-bottom: 16px;
}

/* 流程步骤 */
.process-steps {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
  counter-reset: step;
}

.process-step {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 24px;
  position: relative;
  text-align: left;
}

.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background-color: var(--color-primary);
  color: var(--color-white);
  font-size: 0.875rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.step-title {
  font-size: 1rem;
  margin-bottom: 8px;
}

.step-text {
  font-size: 0.875rem;
  line-height: 1.6;
  margin: 0;
}

.process-cta {
  margin-top: 32px;
  text-align: center;
}

/* FAQ 首页 */
.faq-list {
  max-width: 800px;
}

.faq-more {
  margin-top: 24px;
}

/* 知识中心入口 */
.knowledge-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.knowledge-card {
  display: block;
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 24px;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.knowledge-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(36, 59, 83, 0.1);
  border-color: var(--color-primary);
}

.knowledge-card-title {
  font-size: 1rem;
  margin-bottom: 8px;
  color: var(--color-heading);
}

.knowledge-card-text {
  font-size: 0.875rem;
  line-height: 1.6;
  margin: 0;
  color: var(--color-text);
}

/* =========================================================
   pages - 内页通用与各页
   ========================================================= */
/* 服务矩阵页 */
.service-block {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  margin-bottom: 32px;
  overflow: hidden;
}

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

.service-body {
  padding: 32px;
}

.service-body h2 {
  font-size: 1.375rem;
  margin-bottom: 12px;
}

.service-intro {
  font-size: 1rem;
  line-height: 1.7;
  margin-bottom: 24px;
}

.service-detail h3 {
  font-size: 1rem;
  color: var(--color-primary);
  margin-top: 20px;
  margin-bottom: 8px;
}

.service-list {
  list-style: disc;
  padding-left: 20px;
  margin-bottom: 12px;
}

.service-list li {
  font-size: 0.9375rem;
  line-height: 1.6;
  margin-bottom: 4px;
}

.service-boundary {
  background-color: rgba(242, 201, 76, 0.08);
  border: 1px solid rgba(242, 201, 76, 0.3);
  border-radius: var(--radius);
  padding: 24px;
  margin-top: 40px;
}

.service-boundary h2 {
  font-size: 1.125rem;
  margin-bottom: 12px;
}

.boundary-list {
  list-style: disc;
  padding-left: 20px;
  margin: 12px 0;
}

.boundary-list li {
  font-size: 0.9375rem;
  line-height: 1.6;
  margin-bottom: 4px;
}

/* 场景方案页 */
.layout-shell {
  margin-top: 0;
}

.solution-block {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  margin-bottom: 32px;
  overflow: hidden;
}

.solution-media img {
  width: 100%;
  height: 220px;
  object-fit: cover;
}

.solution-body {
  padding: 32px;
}

.solution-body h2 {
  font-size: 1.375rem;
  margin-bottom: 12px;
}

.solution-intro {
  font-size: 1rem;
  line-height: 1.7;
  margin-bottom: 20px;
}

.solution-section {
  margin-bottom: 20px;
}

.solution-section h3 {
  font-size: 1rem;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.solution-section ul {
  list-style: disc;
  padding-left: 20px;
}

.solution-section li {
  font-size: 0.9375rem;
  line-height: 1.6;
  margin-bottom: 4px;
}

.suggestion-block {
  background-color: rgba(22, 105, 122, 0.06);
  border-radius: var(--radius);
  padding: 32px;
  margin-top: 40px;
}

.suggestion-block h2 {
  font-size: 1.25rem;
  margin-bottom: 16px;
}

.suggestion-links {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 16px;
}

.suggestion-links a {
  display: inline-block;
  padding: 8px 16px;
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: 6px;
  font-size: 0.875rem;
  color: var(--color-primary);
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.suggestion-links a:hover {
  border-color: var(--color-primary);
  background-color: rgba(22, 105, 122, 0.06);
}

/* 知识中心页 */
.content-media-inline {
  margin-bottom: 32px;
  border-radius: var(--radius);
  overflow: hidden;
}

.content-media-inline img {
  width: 100%;
  height: 260px;
  object-fit: cover;
}

.content-media-inline figcaption {
  font-size: 0.8125rem;
  color: var(--color-text-light);
  padding: 8px 16px;
  background-color: var(--color-white);
  border-bottom: 1px solid var(--color-line);
}

.knowledge-group {
  margin-bottom: 48px;
}

.group-heading {
  font-size: 1.375rem;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--color-primary);
  margin-bottom: 24px;
}

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

.term-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 20px;
}

.term-name {
  font-size: 1rem;
  margin-bottom: 8px;
  color: var(--color-primary);
}

.term-def {
  font-size: 0.875rem;
  line-height: 1.6;
  margin-bottom: 12px;
}

.term-related {
  font-size: 0.8125rem;
  font-weight: 600;
}

.feedback-note {
  background-color: rgba(255, 126, 103, 0.08);
  border-radius: var(--radius);
  padding: 24px;
  margin-top: 40px;
}

.feedback-title {
  font-size: 1.125rem;
  margin-bottom: 8px;
}

.feedback-desc {
  font-size: 0.9375rem;
  line-height: 1.6;
  margin-bottom: 12px;
}

.feedback-link {
  font-weight: 600;
}

/* 服务权益页 */
.title-area-text {
  margin-bottom: 24px;
}

.title-area-media img {
  width: 100%;
  max-height: 260px;
  object-fit: cover;
  border-radius: var(--radius);
}

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

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

.section-heading h2 {
  font-size: 1.5rem;
  margin-bottom: 8px;
}

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

.benefit-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 32px;
}

.benefit-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--color-line);
}

.benefit-card-header h3 {
  font-size: 1.125rem;
}

.benefit-tag {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 4px;
  background-color: rgba(22, 105, 122, 0.1);
  color: var(--color-primary);
  font-size: 0.8125rem;
  font-weight: 600;
  white-space: nowrap;
}

.benefit-block {
  margin-bottom: 16px;
}

.benefit-block h4 {
  font-size: 0.9375rem;
  color: var(--color-primary);
  margin-bottom: 4px;
}

.benefit-block p {
  font-size: 0.875rem;
  line-height: 1.6;
  margin: 0;
}

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

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

.usage-item {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 24px;
}

.usage-item h3 {
  font-size: 1rem;
  margin-bottom: 8px;
}

.usage-item p {
  font-size: 0.875rem;
  line-height: 1.6;
  margin: 0;
}

.related-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.related-link {
  display: inline-block;
  padding: 8px 16px;
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: 6px;
  font-size: 0.875rem;
  color: var(--color-primary);
  transition: border-color 0.2s ease;
}

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

/* 合作流程页 */
.process-hero-figure {
  margin-bottom: 40px;
  border-radius: var(--radius);
  overflow: hidden;
}

.process-hero-figure img {
  width: 100%;
  height: 280px;
  object-fit: cover;
}

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

.process-section .section-title,
.process-detail-section .section-title,
.process-faq-section .section-title,
.process-cta-section .section-title {
  font-size: 1.5rem;
  margin-bottom: 12px;
}

.section-description {
  font-size: 1rem;
  line-height: 1.7;
  margin-bottom: 32px;
}

.process-timeline {
  position: relative;
  padding-left: 0;
}

.process-timeline .process-step {
  position: relative;
  padding: 0 0 32px 48px;
  border: none;
  background: none;
}

.process-timeline .process-step::before {
  content: "";
  position: absolute;
  left: 14px;
  top: 32px;
  bottom: 0;
  width: 2px;
  background-color: var(--color-line);
}

.process-timeline .process-step:last-child::before {
  display: none;
}

.step-number {
  position: absolute;
  left: 0;
  top: 0;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background-color: var(--color-primary);
  color: var(--color-white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.875rem;
  font-weight: 700;
  z-index: 1;
}

.step-title {
  font-size: 1.125rem;
  margin-bottom: 8px;
}

.step-desc {
  font-size: 0.9375rem;
  line-height: 1.6;
  margin-bottom: 12px;
}

.step-detail {
  background-color: var(--color-white);
  border-radius: var(--radius);
  padding: 16px;
  font-size: 0.875rem;
}

.step-detail p {
  margin-bottom: 4px;
}

.step-detail strong {
  color: var(--color-heading);
  margin-right: 4px;
}

.role-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
}

.role-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 20px;
}

.role-card h3 {
  font-size: 1rem;
  margin-bottom: 8px;
}

.role-card p {
  font-size: 0.875rem;
  line-height: 1.6;
  margin-bottom: 4px;
}

.role-card strong {
  color: var(--color-heading);
  margin-right: 4px;
}

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

.process-cta-section {
  background-color: rgba(22, 105, 122, 0.06);
  border-radius: var(--radius);
  padding: 32px;
  margin-bottom: 48px;
}

.process-cta-section p {
  font-size: 0.9375rem;
  line-height: 1.7;
}

.process-cta-section a {
  display: inline-block;
  margin-right: 12px;
  margin-top: 8px;
}

/* FAQ 页 */
.faq-title-area {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: center;
  margin-bottom: 40px;
}

.title-area-desc {
  font-size: 1rem;
  line-height: 1.7;
}

.title-area-figure img {
  width: 100%;
  height: 220px;
  object-fit: cover;
  border-radius: var(--radius);
}

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

.faq-section .section-title {
  font-size: 1.25rem;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--color-primary);
  margin-bottom: 20px;
}

.faq-answer {
  padding: 0 20px 16px;
  font-size: 0.9375rem;
  line-height: 1.7;
}

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

/* 关于我们页 */
.single-col {
  max-width: 100%;
}

.block-section {
  margin-bottom: 56px;
}

.block-section > h2 {
  font-size: 1.5rem;
  margin-bottom: 24px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--color-primary);
}

.about-intro {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}

.intro-text h2 {
  font-size: 1.375rem;
  margin-bottom: 16px;
}

.intro-text p {
  font-size: 1rem;
  line-height: 1.7;
}

.intro-media img {
  width: 100%;
  height: 280px;
  object-fit: cover;
  border-radius: var(--radius);
}

.intro-media figcaption {
  font-size: 0.8125rem;
  color: var(--color-text-light);
  margin-top: 8px;
  text-align: center;
}

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

.principle-item {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 24px;
}

.principle-item h3 {
  font-size: 1.0625rem;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.principle-item p {
  font-size: 0.9375rem;
  line-height: 1.6;
  margin: 0;
}

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

.workstyle-item {
  display: flex;
  gap: 20px;
  align-items: flex-start;
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 24px;
}

.workstyle-step {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: var(--color-primary);
  color: var(--color-white);
  font-size: 0.9375rem;
  font-weight: 700;
  flex-shrink: 0;
}

.workstyle-content h3 {
  font-size: 1.0625rem;
  margin-bottom: 8px;
}

.workstyle-content p {
  font-size: 0.9375rem;
  line-height: 1.6;
  margin: 0;
}

.boundary-lead {
  font-size: 1rem;
  line-height: 1.7;
  margin-bottom: 16px;
}

.boundary-note {
  font-size: 0.9375rem;
  line-height: 1.6;
  margin-top: 16px;
  color: var(--color-text-light);
}

/* 404 页 */
.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 80px 24px;
  min-height: 60vh;
}

.error-section {
  text-align: center;
  max-width: 480px;
}

.error-code {
  font-size: 5rem;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: 16px;
}

.error-title {
  font-size: 1.5rem;
  margin-bottom: 16px;
}

.error-desc {
  font-size: 1rem;
  line-height: 1.7;
  margin-bottom: 32px;
}

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

.error-link {
  display: inline-block;
  padding: 12px 24px;
  border-radius: var(--radius);
  font-size: var(--font-size-small);
  font-weight: 600;
  background-color: var(--color-primary);
  color: var(--color-white);
  transition: background-color 0.2s ease;
}

.error-link:hover {
  background-color: #0f5563;
  color: var(--color-white);
}

/* =========================================================
   responsive - 响应式
   ========================================================= */
@media (max-width: 1024px) {
  .footer-inner {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }

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

  .role-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .process-steps {
    grid-template-columns: repeat(3, 1fr);
  }

  .hero-inner {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .hero-media {
    order: 2;
  }

  .sidebar-left {
    grid-template-columns: 220px minmax(0, 1fr);
    gap: 24px;
  }
}

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

  .nav-toggle {
    display: flex;
  }

  .main-nav .nav-list {
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    background-color: var(--color-white);
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px 16px 16px;
    border-bottom: 1px solid var(--color-line);
    box-shadow: 0 8px 16px rgba(36, 59, 83, 0.08);
    display: none;
    z-index: 100;
  }

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

  .nav-item {
    width: 100%;
  }

  .nav-link {
    padding: 12px 8px;
    border-radius: 6px;
  }

  .dropdown-menu {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    box-shadow: none;
    border: none;
    border-left: 2px solid var(--color-line);
    margin-left: 12px;
    padding: 0 0 8px;
    min-width: 0;
  }

  .dropdown-menu li a {
    padding: 8px 12px;
  }

  .hero-inner {
    padding: 40px 16px;
  }

  .hero-title {
    font-size: 1.75rem;
  }

  .hero-image {
    height: 240px;
  }

  .section-block {
    padding: 48px 0;
  }

  .section-inner {
    padding: 0 16px;
  }

  .services-grid,
  .scenarios-grid,
  .benefits-grid,
  .principles-grid {
    grid-template-columns: 1fr;
  }

  .process-steps {
    grid-template-columns: 1fr;
  }

  .knowledge-grid {
    grid-template-columns: 1fr;
  }

  .sidebar-left {
    display: flex;
    flex-direction: column;
    gap: 32px;
  }

  .sidebar {
    position: static;
    width: 100%;
    order: 2;
  }

  .sidebar-left .content-area,
  .sidebar-left .main-content {
    order: 1;
    width: 100%;
  }

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

  .page-title {
    font-size: 1.5rem;
  }

  .page-title-area {
    margin-bottom: 24px;
  }

  .faq-title-area {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .title-area-figure img {
    height: 180px;
  }

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

  .role-grid {
    grid-template-columns: 1fr;
  }

  .term-grid {
    grid-template-columns: 1fr;
  }

  .about-intro {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .intro-media img {
    height: 220px;
  }

  .process-hero-figure img {
    height: 200px;
  }

  .service-media img,
  .solution-media img {
    height: 180px;
  }

  .service-body,
  .solution-body {
    padding: 24px;
  }

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

  .footer-bottom {
    padding: 16px;
  }

  .workstyle-item {
    flex-direction: column;
    gap: 12px;
  }

  .error-code {
    font-size: 3.5rem;
  }

  .process-timeline .process-step {
    padding-left: 40px;
  }

  .process-timeline .process-step::before {
    left: 12px;
  }

  .step-number {
    width: 28px;
    height: 28px;
    font-size: 0.8125rem;
  }
}

@media (min-width: 769px) {
  .nav-toggle {
    display: none;
  }

  .main-nav .nav-list {
    display: flex;
  }
}

/* 程序验收反馈：移动端正文优先 */
@media (max-width: 768px) {
  .site-main :is(.page-content, .main-content, .content-main) {
    order: 1;
  }

  .site-main :is(aside, .sidebar) {
    order: 2;
  }
}