/* ============================================================
   911吃瓜网 · 整站样式表
   理性咨询风：深灰文字 + 蓝绿点缀 + 浅灰背景
   ============================================================ */

/* ============================================================
   1. Base —— 基础变量、重置、字体与通用元素
   ============================================================ */
:root {
  --color-text: #2E3A48;
  --color-accent: #1F8A8C;
  --color-accent-light: #EAF4F4;
  --color-bg: #F6F8FA;
  --color-card: #FFFFFF;
  --color-line: #C9D1D9;
  --color-text-light: #5A6B7A;
  --container-width: 1200px;
  --container-gutter: 24px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --font-main: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
  --shadow-card: 0 1px 3px rgba(46, 58, 72, 0.06);
  --header-height: 64px;
}

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

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

body {
  font-family: var(--font-main);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

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

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

a:hover {
  color: #16696B;
}

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

h1 {
  font-size: 32px;
}

h2 {
  font-size: 24px;
}

h3 {
  font-size: 18px;
  font-weight: 600;
}

ul, ol {
  list-style-position: inside;
}

p {
  margin-bottom: 12px;
}

/* ============================================================
   2. Layout —— 全站布局骨架：页头、页脚、主体容器
   ============================================================ */

/* --- 页头 --- */
.site-header {
  background-color: var(--color-card);
  border-bottom: 1px solid var(--color-line);
  width: 100%;
}

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

.brand-logo {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-text);
  white-space: nowrap;
  letter-spacing: 0.5px;
}

.brand-logo:hover {
  color: var(--color-accent);
}

/* --- 主导航 --- */
.main-nav {
  display: block;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
}

.nav-list li {
  list-style: none;
}

.nav-link {
  display: block;
  padding: 8px 14px;
  font-size: 15px;
  color: var(--color-text);
  border-radius: var(--radius-sm);
  transition: background-color 0.2s ease, color 0.2s ease;
  white-space: nowrap;
}

.nav-link:hover {
  color: var(--color-accent);
  background-color: var(--color-accent-light);
}

.nav-link.is-current {
  color: var(--color-accent);
  font-weight: 600;
  background-color: var(--color-accent-light);
}

/* --- 汉堡按钮（默认隐藏） --- */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 10px;
  flex-direction: column;
  gap: 5px;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
}

.nav-toggle:hover {
  background-color: var(--color-accent-light);
}

.toggle-bar {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-text);
  border-radius: 1px;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

/* --- 页脚 --- */
.site-footer {
  background-color: var(--color-card);
  border-top: 1px solid var(--color-line);
  margin-top: 64px;
}

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

.footer-brand p {
  font-size: 14px;
  color: var(--color-text-light);
  margin-top: 12px;
  max-width: 320px;
}

.footer-logo {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-text);
}

.footer-links h2,
.footer-help h2 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--color-text);
}

.footer-links ul,
.footer-help ul {
  list-style: none;
  padding: 0;
}

.footer-links li,
.footer-help li {
  list-style: none;
  margin-bottom: 10px;
}

.footer-links a,
.footer-help a {
  font-size: 14px;
  color: var(--color-text-light);
  transition: color 0.2s ease;
}

.footer-links a:hover,
.footer-help a:hover {
  color: var(--color-accent);
}

.footer-copyright {
  grid-column: 1 / -1;
  border-top: 1px solid var(--color-line);
  padding-top: 20px;
  margin-top: 16px;
}

.footer-copyright p {
  font-size: 13px;
  color: var(--color-text-light);
  margin-bottom: 0;
}

/* --- 主体通用 --- */
.site-main {
  min-height: 60vh;
}

/* ============================================================
   3. Components —— 通用组件：按钮、面包屑、卡片、FAQ、表格等
   ============================================================ */

/* --- 按钮 --- */
.btn-primary {
  display: inline-block;
  padding: 12px 28px;
  background-color: var(--color-accent);
  color: #FFFFFF;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  transition: background-color 0.2s ease, transform 0.2s ease;
  text-align: center;
}

.btn-primary:hover {
  background-color: #16696B;
  color: #FFFFFF;
  transform: translateY(-1px);
}

.btn-secondary {
  display: inline-block;
  padding: 12px 28px;
  background-color: transparent;
  color: var(--color-accent);
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-accent);
  cursor: pointer;
  transition: background-color 0.2s ease, color 0.2s ease;
  text-align: center;
}

.btn-secondary:hover {
  background-color: var(--color-accent-light);
  color: #16696B;
}

/* --- 面包屑 --- */
.breadcrumb {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 20px var(--container-gutter) 0;
  font-size: 14px;
  color: var(--color-text-light);
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

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

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

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

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

/* --- 页面标题区 --- */
.page-header {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 24px var(--container-gutter) 0;
}

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

/* --- 内页主容器 --- */
.inner-main {
  background-color: var(--color-bg);
}

.page-container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--container-gutter);
}

/* --- 页面标题下的说明区 --- */
.page-title-area,
.page-title-block {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 16px var(--container-gutter) 0;
}

.page-title-area p,
.page-title-block p {
  font-size: 16px;
  color: var(--color-text-light);
  max-width: 720px;
}

/* --- 相关链接（页底导航） --- */
.related-links {
  max-width: var(--container-width);
  margin: 48px auto 0;
  padding: 0 var(--container-gutter);
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px 16px;
  font-size: 14px;
}

.related-links-label {
  color: var(--color-text-light);
  font-weight: 600;
}

.related-links-item {
  color: var(--color-accent);
  padding: 6px 12px;
  background-color: var(--color-accent-light);
  border-radius: var(--radius-sm);
  transition: background-color 0.2s ease;
}

.related-links-item:hover {
  background-color: #D8ECEC;
  color: #16696B;
}

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

.faq-item summary {
  padding: 16px 20px;
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  cursor: pointer;
  list-style: none;
  position: relative;
  padding-right: 44px;
  transition: background-color 0.2s ease;
}

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

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

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

.faq-item summary:hover {
  background-color: var(--color-accent-light);
}

.faq-answer {
  padding: 0 20px 16px;
  border-top: 1px solid var(--color-line);
}

.faq-answer p {
  padding-top: 12px;
  font-size: 15px;
  color: var(--color-text-light);
  margin-bottom: 0;
}

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

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

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

/* ============================================================
   4. Pages —— 首页各区块
   ============================================================ */

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

.hero-content {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 56px var(--container-gutter) 32px;
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 48px;
  align-items: center;
}

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

.hero-lead {
  font-size: 17px;
  color: var(--color-text-light);
  margin-bottom: 28px;
  max-width: 520px;
}

.hero-figure img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
}

/* --- 服务索引（首屏下方三列） --- */
.service-index {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--container-gutter) 40px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.service-index-item {
  display: block;
  background-color: var(--color-bg);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 20px;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.service-index-item:hover {
  border-color: var(--color-accent);
  box-shadow: 0 2px 8px rgba(31, 138, 140, 0.12);
}

.index-num {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  color: var(--color-accent);
  background-color: var(--color-accent-light);
  border-radius: var(--radius-sm);
  padding: 2px 10px;
  margin-bottom: 10px;
}

.index-title {
  display: block;
  font-size: 17px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 6px;
}

.index-desc {
  display: block;
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
}

/* --- 通用 section 容器 --- */
.section-heading {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--container-gutter);
}

.section-heading h2 {
  font-size: 24px;
  margin-bottom: 8px;
}

.section-heading p {
  font-size: 15px;
  color: var(--color-text-light);
  max-width: 640px;
}

/* --- 服务对比表 --- */
.service-compare-section {
  padding: 56px 0 24px;
}

.table-wrapper {
  max-width: var(--container-width);
  margin: 24px auto 0;
  padding: 0 var(--container-gutter);
  overflow-x: auto;
}

.compare-table {
  width: 100%;
  border-collapse: collapse;
  background-color: var(--color-card);
  border-radius: var(--radius-md);
  overflow: hidden;
  min-width: 640px;
}

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

.compare-table thead th {
  background-color: var(--color-accent-light);
  font-weight: 600;
  color: var(--color-text);
  border-bottom: 2px solid var(--color-accent);
}

.compare-table tbody th {
  background-color: var(--color-bg);
  font-weight: 600;
  white-space: nowrap;
}

/* --- 场景卡片（首页） --- */
.scenario-section {
  padding: 40px 0;
}

.scenario-grid {
  max-width: var(--container-width);
  margin: 24px auto 0;
  padding: 0 var(--container-gutter);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

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

.scenario-card:hover {
  box-shadow: 0 4px 12px rgba(46, 58, 72, 0.1);
  transform: translateY(-2px);
}

.scenario-card img {
  width: 100%;
  height: 140px;
  object-fit: cover;
}

.scenario-card h3 {
  padding: 14px 16px 4px;
  font-size: 16px;
}

.scenario-card p {
  padding: 0 16px 16px;
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 0;
}

/* --- 维度引导块（首页） --- */
.dimension-guide-section {
  padding: 32px 0;
}

.dimension-guide-content {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 32px var(--container-gutter);
  background-color: var(--color-accent-light);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}

.dimension-guide-text h2 {
  font-size: 20px;
  margin-bottom: 8px;
}

.dimension-guide-text p {
  font-size: 15px;
  color: var(--color-text-light);
  margin-bottom: 0;
  max-width: 560px;
}

/* --- 合作流程时间线（首页） --- */
.process-section {
  padding: 40px 0;
}

.process-timeline {
  max-width: var(--container-width);
  margin: 32px auto 0;
  padding: 0 var(--container-gutter);
  list-style: none;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.process-timeline li {
  list-style: none;
  position: relative;
  padding-top: 36px;
}

.process-timeline li::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--color-line);
}

.process-timeline li::after {
  content: '';
  position: absolute;
  top: -4px;
  left: 0;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: var(--color-accent);
}

.process-step .step-num {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  color: var(--color-accent);
  background-color: var(--color-accent-light);
  border-radius: var(--radius-sm);
  padding: 2px 10px;
  margin-bottom: 8px;
}

.process-step h3 {
  font-size: 16px;
  margin-bottom: 6px;
}

.process-step p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 0;
}

/* --- FAQ 预览（首页） --- */
.faq-preview-section {
  padding: 40px 0;
}

.faq-preview-list {
  max-width: var(--container-width);
  margin: 24px auto 0;
  padding: 0 var(--container-gutter);
}

.faq-preview-list .faq-item p {
  padding: 16px 20px;
  font-size: 15px;
  color: var(--color-text-light);
  border-top: 1px solid var(--color-line);
  margin-bottom: 0;
}

.link-more {
  display: inline-block;
  max-width: var(--container-width);
  margin: 16px auto 0;
  padding: 0 var(--container-gutter);
  font-size: 15px;
  font-weight: 600;
  color: var(--color-accent);
}

.link-more:hover {
  color: #16696B;
}

/* --- CTA 区（首页） --- */
.cta-section {
  max-width: var(--container-width);
  margin: 24px auto 0;
  padding: 48px var(--container-gutter);
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  text-align: center;
}

.cta-section h2 {
  font-size: 24px;
  margin-bottom: 12px;
}

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

/* ============================================================
   5. Pages —— 内页各区块
   ============================================================ */

/* --- 通用 intro 区 --- */
.intro-section,
.dims-intro,
.guide-intro,
.faq-intro,
.intro-block {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 32px var(--container-gutter) 8px;
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 40px;
  align-items: center;
}

.intro-content p,
.intro-text p,
.intro-copy p {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.8;
  margin-bottom: 12px;
}

.intro-media,
.intro-figure {
  margin: 0;
}

.intro-media img,
.intro-figure img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
}

/* --- 服务目录页 --- */
.service-list-section,
.delivery-standard-section,
.service-boundary-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 32px var(--container-gutter) 0;
}

.service-list-section h2,
.delivery-standard-section h2,
.service-boundary-section h2 {
  font-size: 22px;
  margin-bottom: 8px;
}

.service-list-section > p,
.delivery-standard-section > p,
.service-boundary-section > p {
  font-size: 15px;
  color: var(--color-text-light);
  margin-bottom: 20px;
}

.service-items {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

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

.service-item-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.service-item-header h3 {
  font-size: 18px;
}

.service-tag {
  font-size: 12px;
  font-weight: 600;
  color: var(--color-accent);
  background-color: var(--color-accent-light);
  padding: 2px 10px;
  border-radius: var(--radius-sm);
}

.service-item p {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 8px;
}

.service-item h4 {
  font-size: 15px;
  font-weight: 600;
  margin: 12px 0 6px;
  color: var(--color-text);
}

/* --- 交付标准 --- */
.standard-list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.standard-list li {
  list-style: none;
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 20px;
}

.standard-list h3 {
  font-size: 16px;
  margin-bottom: 6px;
}

.standard-list p {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 0;
  line-height: 1.6;
}

/* --- 服务边界 --- */
.boundary-list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.boundary-list li {
  list-style: none;
  background-color: var(--color-card);
  border-left: 3px solid var(--color-accent);
  border-radius: var(--radius-sm);
  padding: 16px 20px;
  font-size: 15px;
  color: var(--color-text);
  line-height: 1.6;
}

.service-boundary-section > p:last-child {
  margin-top: 16px;
  font-size: 14px;
}

.service-boundary-section > p a {
  font-weight: 600;
}

/* --- 比较维度页 --- */
.dimension-table-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 32px var(--container-gutter) 0;
}

.dimension-table-section h2 {
  font-size: 22px;
  margin-bottom: 8px;
}

.dimension-table-section > p {
  font-size: 15px;
  color: var(--color-text-light);
  margin-bottom: 20px;
}

.table-wrap {
  overflow-x: auto;
  background-color: var(--color-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-line);
}

.dimension-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 560px;
}

.dimension-table th,
.dimension-table td {
  padding: 14px 16px;
  text-align: left;
  font-size: 14px;
  border-bottom: 1px solid var(--color-line);
  vertical-align: top;
}

.dimension-table thead th {
  background-color: var(--color-accent-light);
  font-weight: 600;
  color: var(--color-text);
}

.dimension-table tbody th {
  background-color: var(--color-bg);
  font-weight: 600;
  white-space: nowrap;
}

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

/* --- 偏好卡片 --- */
.preference-cards-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 32px var(--container-gutter) 0;
}

.preference-cards-section h2 {
  font-size: 22px;
  margin-bottom: 8px;
}

.preference-cards-section > p {
  font-size: 15px;
  color: var(--color-text-light);
  margin-bottom: 20px;
}

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

.preference-card {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 24px;
}

.preference-card h3 {
  font-size: 17px;
  margin-bottom: 10px;
  color: var(--color-accent);
}

.preference-card p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 0;
}

/* --- 维度引导块（内页） --- */
.dimension-guide-block {
  max-width: var(--container-width);
  margin: 32px auto 0;
  padding: 0 var(--container-gutter);
}

.guide-block-inner {
  background-color: var(--color-accent-light);
  border-radius: var(--radius-md);
  padding: 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}

.guide-block-text h2 {
  font-size: 20px;
  margin-bottom: 8px;
}

.guide-block-text p {
  font-size: 15px;
  color: var(--color-text-light);
  margin-bottom: 0;
  max-width: 560px;
}

/* --- 适用场景页 --- */
.scenario-grid {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 32px var(--container-gutter) 0;
}

.scenario-grid h2 {
  font-size: 22px;
  margin-bottom: 20px;
}

.scenario-card-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.scenario-card-list .scenario-card {
  padding-bottom: 16px;
}

.tag-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 0 16px 16px;
}

.tag-list li {
  list-style: none;
  font-size: 13px;
  color: var(--color-accent);
  background-color: var(--color-accent-light);
  padding: 4px 12px;
  border-radius: var(--radius-sm);
}

/* --- 场景与方案关联说明 --- */
.relation-note {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 32px var(--container-gutter) 0;
}

.relation-note h2 {
  font-size: 22px;
  margin-bottom: 12px;
}

.relation-note p {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.8;
  max-width: 720px;
}

/* --- 选择指南页 --- */
.decision-steps {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 32px var(--container-gutter) 0;
}

.decision-steps h2 {
  font-size: 22px;
  margin-bottom: 20px;
}

.steps-list {
  list-style: none;
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.step-item {
  list-style: none;
  display: flex;
  gap: 20px;
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 24px;
}

.step-number {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: var(--color-accent);
  color: #FFFFFF;
  font-size: 18px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

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

.step-content p {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 0;
}

/* --- 自检清单 --- */
.checklist-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 32px var(--container-gutter) 0;
}

.checklist-section h2 {
  font-size: 22px;
  margin-bottom: 8px;
}

.checklist-section > p {
  font-size: 15px;
  color: var(--color-text-light);
  margin-bottom: 20px;
}

.checklist {
  list-style: none;
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 24px 28px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.checklist li {
  list-style: none;
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 15px;
  line-height: 1.6;
}

.checklist input[type="checkbox"] {
  width: 18px;
  height: 18px;
  margin-top: 3px;
  accent-color: var(--color-accent);
  flex-shrink: 0;
}

.checklist label {
  cursor: pointer;
  color: var(--color-text);
}

/* --- 常见误区 --- */
.common-mistakes {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 32px var(--container-gutter) 0;
}

.common-mistakes h2 {
  font-size: 22px;
  margin-bottom: 20px;
}

.mistake-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.mistake-card {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-top: 3px solid var(--color-accent);
  border-radius: var(--radius-md);
  padding: 24px;
}

.mistake-card h3 {
  font-size: 16px;
  margin-bottom: 10px;
  color: var(--color-text);
}

.mistake-card p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 0;
}

/* --- 指南页底部相关链接 --- */
.related-links ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
}

.related-links li {
  list-style: none;
}

.related-links a {
  color: var(--color-accent);
  font-weight: 600;
}

/* --- FAQ 页 --- */
.faq-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 32px var(--container-gutter) 0;
}

.faq-section h2 {
  font-size: 22px;
  margin-bottom: 20px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-accent);
}

.faq-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

/* --- 合作入口（FAQ页） --- */
.cooperation-link {
  max-width: var(--container-width);
  margin: 32px auto 0;
  padding: 0 var(--container-gutter);
}

.cooperation-inner {
  background-color: var(--color-accent-light);
  border-radius: var(--radius-md);
  padding: 40px;
  text-align: center;
}

.cooperation-inner h2 {
  font-size: 22px;
  margin-bottom: 12px;
}

.cooperation-inner p {
  font-size: 15px;
  color: var(--color-text-light);
  max-width: 560px;
  margin: 0 auto 24px;
}

.cooperation-actions {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

/* --- 404 页 --- */
.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  padding: 48px var(--container-gutter);
}

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

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

.error-content h1 {
  font-size: 28px;
  margin-bottom: 12px;
}

.error-desc {
  font-size: 16px;
  color: var(--color-text-light);
  margin-bottom: 24px;
}

/* ============================================================
   6. Responsive —— 响应式断点
   ============================================================ */

/* --- 平板及以下（≤1024px） --- */
@media (max-width: 1024px) {
  .hero-content {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .hero-text h1 {
    font-size: 32px;
  }

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

  .process-timeline {
    grid-template-columns: repeat(2, 1fr);
    gap: 32px 24px;
  }

  .intro-section,
  .dims-intro,
  .guide-intro,
  .faq-intro,
  .intro-block {
    grid-template-columns: 1fr;
    gap: 24px;
  }

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

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

/* --- 手机端（≤768px） --- */
@media (max-width: 768px) {
  :root {
    --container-gutter: 16px;
    --header-height: 56px;
  }

  h1 {
    font-size: 24px;
  }

  h2 {
    font-size: 20px;
  }

  /* --- 导航：显示汉堡，隐藏列表 --- */
  .nav-toggle {
    display: flex;
  }

  .nav-list {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background-color: var(--color-card);
    border-bottom: 1px solid var(--color-line);
    flex-direction: column;
    align-items: stretch;
    padding: 8px 16px 16px;
    box-shadow: 0 4px 12px rgba(46, 58, 72, 0.08);
    z-index: 100;
  }

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

  .nav-list li {
    border-bottom: 1px solid var(--color-line);
  }

  .nav-list li:last-child {
    border-bottom: none;
  }

  .nav-link {
    padding: 14px 8px;
    font-size: 16px;
    border-radius: 0;
  }

  /* --- 页脚 --- */
  .footer-inner {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 32px var(--container-gutter) 16px;
  }

  .footer-copyright {
    grid-column: 1;
  }

  /* --- 首页 --- */
  .hero-content {
    padding: 32px var(--container-gutter) 24px;
  }

  .hero-text h1 {
    font-size: 26px;
  }

  .service-index {
    grid-template-columns: 1fr;
    gap: 12px;
    padding-bottom: 24px;
  }

  .service-compare-section,
  .scenario-section,
  .process-section,
  .faq-preview-section {
    padding-top: 32px;
  }

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

  .process-timeline {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .dimension-guide-content {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
    padding: 24px;
  }

  .cta-section {
    padding: 32px var(--container-gutter);
  }

  /* --- 内页 --- */
  .breadcrumb {
    padding-top: 14px;
    font-size: 13px;
  }

  .page-header {
    padding-top: 16px;
  }

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

  .intro-section,
  .dims-intro,
  .guide-intro,
  .faq-intro,
  .intro-block {
    padding-top: 24px;
  }

  .service-list-section,
  .delivery-standard-section,
  .service-boundary-section,
  .dimension-table-section,
  .preference-cards-section,
  .scenario-grid,
  .relation-note,
  .decision-steps,
  .checklist-section,
  .common-mistakes,
  .faq-section {
    padding-top: 24px;
  }

  .service-item {
    padding: 20px;
  }

  .service-item-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }

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

  .scenario-card-list {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .step-item {
    flex-direction: column;
    gap: 12px;
    padding: 20px;
  }

  .step-number {
    width: 36px;
    height: 36px;
    font-size: 16px;
  }

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

  .checklist {
    padding: 20px;
  }

  .guide-block-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
    padding: 24px;
  }

  .cooperation-inner {
    padding: 32px 20px;
  }

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

  .cooperation-actions .btn-primary,
  .cooperation-actions .btn-secondary {
    width: 100%;
    max-width: 280px;
  }

  .related-links {
    margin-top: 32px;
    flex-direction: column;
    align-items: flex-start;
  }

  .error-code {
    font-size: 56px;
  }
}

/* --- 小屏手机（≤390px） --- */
@media (max-width: 390px) {
  .hero-text h1 {
    font-size: 24px;
  }

  .compare-table {
    min-width: 560px;
  }

  .dimension-table {
    min-width: 480px;
  }

  .tag-list {
    padding: 0 12px 12px;
  }

  .scenario-card h3 {
    padding: 12px 12px 4px;
  }

  .scenario-card p {
    padding: 0 12px 12px;
  }
}