/* ============================================================
   91传媒 · 整站样式表
   Visual Direction: 专业市集 / 浅灰白底 / 四色分类 / 清晰边界
   ============================================================ */

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

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

body {
  font-family: "PingFang SC", "HarmonyOS Sans", "Microsoft YaHei", "Inter", system-ui, -apple-system, sans-serif;
  font-size: 16px;
  line-height: 1.75;
  color: #232A31;
  background-color: #F4F5F7;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: #0F766E;
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: #0B5C56;
}

ul,
ol {
  list-style: none;
}

figure {
  margin: 0;
}

table {
  width: 100%;
  border-collapse: collapse;
}

.container {
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding-left: 24px;
  padding-right: 24px;
}

.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 — 全站统一视觉骨架
   ============================================================ */

/* 页头 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: #FFFFFF;
  border-bottom: 1px solid #D8DDE3;
}

.header-shell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 24px;
}

.brand-logo {
  display: inline-flex;
  align-items: center;
  font-size: 22px;
  font-weight: 700;
  color: #232A31;
  letter-spacing: 0.5px;
  white-space: nowrap;
}

.brand-logo::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  margin-right: 10px;
  border-radius: 2px;
  background-color: #0F766E;
}

.brand-logo:hover {
  color: #0F766E;
}

/* 主导航 */
.site-nav .nav-list {
  display: flex;
  align-items: center;
  gap: 6px;
}

.site-nav .nav-list a {
  display: inline-block;
  padding: 8px 14px;
  font-size: 15px;
  font-weight: 500;
  color: #4A5560;
  border-radius: 6px;
  transition: color 0.2s ease, background-color 0.2s ease;
}

.site-nav .nav-list a:hover {
  color: #0F766E;
  background-color: #EEF2F5;
}

.site-nav .nav-list a.is-current {
  color: #0F766E;
  background-color: #E6F2F0;
  font-weight: 600;
}

/* 汉堡按钮 */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  background: none;
  border: 1px solid #D8DDE3;
  border-radius: 6px;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: #232A31;
  border-radius: 1px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

/* 主要内容区 */
.site-main {
  min-height: 480px;
}

.inner-main {
  padding-top: 28px;
  padding-bottom: 64px;
}

/* 面包屑 */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 20px;
  font-size: 14px;
  color: #6B7680;
}

.breadcrumb a {
  color: #6B7680;
  transition: color 0.2s ease;
}

.breadcrumb a:hover {
  color: #0F766E;
}

.breadcrumb-sep {
  color: #A0A9B2;
}

.breadcrumb-current {
  color: #232A31;
  font-weight: 500;
}

/* 页面标题区 */
.page-header {
  margin-bottom: 36px;
  padding-bottom: 20px;
  border-bottom: 1px solid #D8DDE3;
}

.page-title {
  font-size: 32px;
  font-weight: 700;
  line-height: 1.35;
  color: #232A31;
  margin-bottom: 10px;
}

.page-description {
  font-size: 16px;
  line-height: 1.75;
  color: #4A5560;
  max-width: 780px;
}

/* 内容 + 侧栏 两栏布局 */
.content-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 288px;
  gap: 32px;
  align-items: start;
}

.main-content {
  min-width: 0;
  min-height: 200px;
}

.main-content > .breadcrumb {
  margin-bottom: 16px;
}

.main-content > .page-header {
  margin-bottom: 32px;
}

/* 侧栏 */
.sidebar {
  min-width: 0;
}

/* 页脚 */
.site-footer {
  background-color: #FFFFFF;
  border-top: 1px solid #D8DDE3;
}

.footer-shell {
  max-width: 1180px;
  margin: 0 auto;
  padding: 48px 24px 28px;
}

.footer-brand {
  padding-bottom: 32px;
  border-bottom: 1px solid #E4E8EB;
}

.footer-logo {
  font-size: 20px;
  font-weight: 700;
  color: #232A31;
  margin-bottom: 8px;
}

.footer-logo::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  margin-right: 8px;
  border-radius: 2px;
  background-color: #0F766E;
}

.footer-desc {
  max-width: 560px;
  font-size: 14px;
  line-height: 1.7;
  color: #6B7680;
}

.footer-nav {
  display: flex;
  justify-content: space-between;
  gap: 32px;
  padding: 28px 0;
  border-bottom: 1px solid #E4E8EB;
}

.footer-title {
  font-size: 14px;
  font-weight: 600;
  color: #232A31;
  margin-bottom: 12px;
}

.footer-nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
}

.footer-nav ul a {
  display: inline-block;
  padding: 4px 0;
  font-size: 14px;
  color: #4A5560;
  transition: color 0.2s ease;
}

.footer-nav ul a:hover {
  color: #0F766E;
}

.footer-legal {
  padding-top: 24px;
  text-align: center;
}

.footer-legal p {
  font-size: 13px;
  line-height: 1.6;
  color: #9AA3AC;
}

/* ============================================================
   Components — 通用按钮、标题、卡片等
   ============================================================ */

/* 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: 6px;
  cursor: pointer;
  transition: background-color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.btn-primary {
  color: #FFFFFF;
  background-color: #0F766E;
  border: 1px solid #0F766E;
}

.btn-primary:hover {
  color: #FFFFFF;
  background-color: #0B5C56;
  border-color: #0B5C56;
}

.btn-secondary {
  color: #0F766E;
  background-color: #FFFFFF;
  border: 1px solid #0F766E;
}

.btn-secondary:hover {
  color: #FFFFFF;
  background-color: #0F766E;
}

/* 区块标题 */
.section-title {
  font-size: 24px;
  font-weight: 700;
  line-height: 1.4;
  color: #232A31;
  margin-bottom: 12px;
}

.section-title + p,
.section-subnote,
.section-note {
  color: #4A5560;
  margin-bottom: 24px;
}

/* 服务卡（通用色标体系） */
.service-card {
  position: relative;
  background-color: #FFFFFF;
  border: 1px solid #D8DDE3;
  border-radius: 8px;
  padding: 24px;
  transition: box-shadow 0.2s ease, transform 0.2s ease, border-color 0.2s ease;
}

.service-card:hover {
  box-shadow: 0 6px 20px rgba(35, 42, 49, 0.08);
  transform: translateY(-2px);
  border-color: #B0B8C0;
}

.service-card h3 {
  font-size: 18px;
  font-weight: 700;
  color: #232A31;
  margin-bottom: 10px;
}

.service-card p {
  font-size: 15px;
  line-height: 1.7;
  color: #4A5560;
}

.service-card a {
  display: inline-block;
  margin-top: 14px;
  font-size: 14px;
  font-weight: 600;
  color: #0F766E;
}

.service-card a:hover {
  color: #0B5C56;
}

/* 四色分类色标（顶部细线） */
.sc-strategy,
.service-card--strategy {
  border-top: 3px solid #2563EB;
}

.sc-content,
.service-card--content {
  border-top: 3px solid #D97706;
}

.sc-channel,
.service-card--channel {
  border-top: 3px solid #059669;
}

.sc-event,
.service-card--event {
  border-top: 3px solid #7C3AED;
}

/* 快捷入口色标 */
.qc-strategy .quick-tag {
  color: #2563EB;
  background-color: #EFF4FF;
}

.qc-content .quick-tag {
  color: #D97706;
  background-color: #FEF7EC;
}

.qc-channel .quick-tag {
  color: #059669;
  background-color: #ECF7F3;
}

.qc-event .quick-tag {
  color: #7C3AED;
  background-color: #F5F0FD;
}

/* 侧栏卡片 */
.sidebar-card,
.sidebar-next,
.sidebar-related,
.resource-links {
  background-color: #FFFFFF;
  border: 1px solid #D8DDE3;
  border-radius: 8px;
  padding: 24px;
  margin-bottom: 24px;
}

.sidebar-card h2,
.sidebar-next h2,
.sidebar-related h2,
.resource-links h2,
.sidebar-title {
  font-size: 16px;
  font-weight: 700;
  color: #232A31;
  padding-bottom: 12px;
  margin-bottom: 16px;
  border-bottom: 1px solid #E4E8EB;
}

.sidebar-card ul li,
.sidebar-next ul li,
.sidebar-related ul li,
.resource-links ul li {
  margin-bottom: 4px;
}

.sidebar-card ul a,
.sidebar-next ul a,
.sidebar-related ul a,
.resource-links ul a {
  display: block;
  padding: 6px 0;
  font-size: 14px;
  line-height: 1.6;
  color: #4A5560;
  transition: color 0.2s ease;
}

.sidebar-card ul a:hover,
.sidebar-next ul a:hover,
.sidebar-related ul a:hover,
.resource-links ul a:hover {
  color: #0F766E;
}

/* 图片容器通用约束 */
figure img {
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: 6px;
}

figure figcaption {
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.6;
  color: #6B7680;
}

/* FAQ 手风琴 */
.faq-item {
  background-color: #FFFFFF;
  border: 1px solid #D8DDE3;
  border-radius: 6px;
  margin-bottom: 12px;
  overflow: hidden;
}

.faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 16px 20px;
  font-size: 15px;
  font-weight: 600;
  color: #232A31;
  cursor: pointer;
  list-style: none;
  transition: background-color 0.2s ease;
}

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

.faq-item summary::after {
  content: "+";
  flex-shrink: 0;
  font-size: 20px;
  font-weight: 400;
  color: #0F766E;
  transition: transform 0.2s ease;
}

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

.faq-item summary:hover {
  background-color: #F7F9FA;
}

.faq-item p {
  padding: 0 20px 16px;
  font-size: 15px;
  line-height: 1.75;
  color: #4A5560;
}

/* 表格 */
.boundary-table,
.combo-table table,
.scenes-table {
  background-color: #FFFFFF;
  border: 1px solid #D8DDE3;
  border-radius: 6px;
  overflow: hidden;
}

.boundary-table th,
.boundary-table td,
.combo-table th,
.combo-table td {
  padding: 12px 16px;
  font-size: 14px;
  line-height: 1.6;
  text-align: left;
  border-bottom: 1px solid #E4E8EB;
  vertical-align: top;
}

.boundary-table th,
.combo-table th {
  font-weight: 600;
  color: #232A31;
  background-color: #F7F9FA;
}

.boundary-table tr:last-child td,
.combo-table tr:last-child td {
  border-bottom: none;
}

/* 相关链接横向条 */
.related-links {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px 16px;
  max-width: 1180px;
  margin: 0 auto;
  padding: 20px 24px;
  border-top: 1px solid #E4E8EB;
}

.related-links-label {
  font-size: 14px;
  font-weight: 600;
  color: #4A5560;
}

.related-links-item {
  display: inline-block;
  padding: 4px 12px;
  font-size: 14px;
  color: #4A5560;
  background-color: #FFFFFF;
  border: 1px solid #D8DDE3;
  border-radius: 20px;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.related-links-item:hover {
  color: #0F766E;
  border-color: #0F766E;
}

/* ============================================================
   Components — 首页专用模块
   ============================================================ */

/* 首屏通知条 + H1 */
.hero-notice {
  padding: 56px 0 48px;
}

.hero-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

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

.notice-tag {
  display: inline-block;
  padding: 4px 14px;
  margin-bottom: 20px;
  font-size: 13px;
  font-weight: 500;
  color: #0F766E;
  background-color: #E6F2F0;
  border-radius: 20px;
}

.hero-copy h1 {
  font-size: 34px;
  font-weight: 700;
  line-height: 1.35;
  color: #232A31;
  margin-bottom: 16px;
}

.hero-desc {
  font-size: 16px;
  line-height: 1.8;
  color: #4A5560;
  margin-bottom: 28px;
  max-width: 520px;
}

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

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

.hero-figure {
  border-radius: 8px;
  overflow: hidden;
  background-color: #E8ECEF;
  aspect-ratio: 4 / 3;
}

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

/* 快捷服务入口 */
.quick-services {
  padding: 48px 0;
  background-color: #FFFFFF;
  border-top: 1px solid #E4E8EB;
  border-bottom: 1px solid #E4E8EB;
}

.quick-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.quick-card {
  display: block;
  padding: 20px;
  background-color: #F7F9FA;
  border: 1px solid #D8DDE3;
  border-radius: 8px;
  transition: box-shadow 0.2s ease, transform 0.2s ease, border-color 0.2s ease;
}

.quick-card:hover {
  box-shadow: 0 4px 16px rgba(35, 42, 49, 0.08);
  transform: translateY(-2px);
  border-color: #B0B8C0;
}

.quick-tag {
  display: inline-block;
  padding: 2px 10px;
  margin-bottom: 12px;
  font-size: 12px;
  font-weight: 600;
  border-radius: 12px;
}

.quick-card h3 {
  font-size: 16px;
  font-weight: 700;
  color: #232A31;
  margin-bottom: 6px;
}

.quick-card p {
  font-size: 14px;
  line-height: 1.6;
  color: #4A5560;
}

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

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

.overview-grid .service-card {
  padding: 28px;
}

.overview-grid .service-card h3 {
  font-size: 19px;
}

/* 场景速览 */
.scene-snapshot {
  padding: 48px 0;
  background-color: #FFFFFF;
  border-top: 1px solid #E4E8EB;
  border-bottom: 1px solid #E4E8EB;
}

.scene-strip {
  display: flex;
  flex-direction: column;
  gap: 28px;
  margin-bottom: 28px;
}

.scene-item {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  align-items: center;
  background-color: #FFFFFF;
  border: 1px solid #E4E8EB;
  border-radius: 8px;
  overflow: hidden;
}

.scene-reverse {
  direction: rtl;
}

.scene-reverse > * {
  direction: ltr;
}

.scene-media {
  min-width: 0;
  background-color: #E8ECEF;
}

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

.scene-content {
  padding: 24px 28px;
  min-width: 0;
}

.scene-content h3 {
  font-size: 20px;
  font-weight: 700;
  color: #232A31;
  margin-bottom: 10px;
}

.scene-content p {
  font-size: 15px;
  line-height: 1.75;
  color: #4A5560;
  margin-bottom: 14px;
}

.scene-content a {
  display: inline-block;
  font-size: 14px;
  font-weight: 600;
  color: #0F766E;
}

.scene-more {
  text-align: center;
}

.scene-more a {
  display: inline-block;
  padding: 10px 28px;
  font-size: 15px;
  font-weight: 600;
  color: #0F766E;
  border: 1px solid #0F766E;
  border-radius: 6px;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.scene-more a:hover {
  color: #FFFFFF;
  background-color: #0F766E;
}

/* 合作流程时间线（首页版） */
.cooperation-timeline {
  padding: 48px 0;
}

.timeline-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 32px;
}

.timeline-item {
  position: relative;
  padding-top: 28px;
}

.timeline-marker {
  position: absolute;
  top: 0;
  left: 0;
  width: 16px;
  height: 16px;
  background-color: #0F766E;
  border: 3px solid #FFFFFF;
  border-radius: 50%;
  box-shadow: 0 0 0 2px #0F766E;
}

.timeline-card {
  background-color: #FFFFFF;
  border: 1px solid #D8DDE3;
  border-radius: 8px;
  padding: 20px;
  min-height: 180px;
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
}

.timeline-card:hover {
  box-shadow: 0 6px 20px rgba(35, 42, 49, 0.08);
  border-color: #0F766E;
}

.timeline-card h3 {
  font-size: 17px;
  font-weight: 700;
  color: #232A31;
  margin-bottom: 8px;
}

.timeline-card p {
  font-size: 14px;
  line-height: 1.7;
  color: #4A5560;
}

.timeline-meta {
  display: inline-block;
  margin-top: 12px;
  padding: 2px 10px;
  font-size: 12px;
  font-weight: 500;
  color: #0F766E;
  background-color: #E6F2F0;
  border-radius: 12px;
}

.timeline-link {
  text-align: center;
}

.timeline-link a {
  display: inline-block;
  font-size: 15px;
  font-weight: 600;
  color: #0F766E;
  border-bottom: 2px solid transparent;
  transition: border-color 0.2s ease;
}

.timeline-link a:hover {
  border-bottom-color: #0F766E;
}

/* FAQ 预览（首页） */
.faq-preview {
  padding: 48px 0;
  background-color: #FFFFFF;
  border-top: 1px solid #E4E8EB;
  border-bottom: 1px solid #E4E8EB;
}

.faq-list {
  max-width: 780px;
}

.faq-more-link {
  display: inline-block;
  margin-top: 8px;
  font-size: 15px;
  font-weight: 600;
  color: #0F766E;
  border-bottom: 2px solid transparent;
  transition: border-color 0.2s ease;
}

.faq-more-link:hover {
  border-bottom-color: #0F766E;
}

/* CTA Panel */
.cta-panel {
  padding: 56px 0;
}

.cta-inner {
  text-align: center;
}

.cta-inner .section-title {
  margin-bottom: 12px;
}

.cta-inner p {
  max-width: 560px;
  margin: 0 auto 32px;
  font-size: 16px;
  line-height: 1.8;
  color: #4A5560;
}

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

.cta-links a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 24px;
  font-size: 15px;
  font-weight: 600;
  color: #0F766E;
  background-color: #FFFFFF;
  border: 1px solid #0F766E;
  border-radius: 6px;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.cta-links a:hover {
  color: #FFFFFF;
  background-color: #0F766E;
}

/* ============================================================
   Pages — 核心服务 91cm/services.html
   ============================================================ */

.page-layout.content-grid {
  grid-template-columns: minmax(0, 1fr) 288px;
}

/* 服务介绍 */
.service-intro p {
  font-size: 15px;
  line-height: 1.8;
  color: #4A5560;
  margin-bottom: 20px;
}

.intro-figure {
  margin: 24px 0;
  background-color: #E8ECEF;
  border-radius: 8px;
  overflow: hidden;
}

.intro-figure img {
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* 服务矩阵 */
.service-matrix {
  margin-top: 40px;
}

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

.service-card--strategy,
.service-card--content,
.service-card--channel,
.service-card--event {
  padding: 28px;
  background-color: #FFFFFF;
  border: 1px solid #D8DDE3;
  border-radius: 8px;
  border-top-width: 3px;
}

.card-scope {
  display: block;
  margin-bottom: 12px;
  font-size: 13px;
  font-weight: 500;
  color: #6B7680;
}

.card-scope strong {
  color: #232A31;
  font-weight: 600;
}

.card-title {
  font-size: 18px;
  font-weight: 700;
  color: #232A31;
  margin-bottom: 10px;
}

.card-desc {
  font-size: 14px;
  line-height: 1.7;
  color: #4A5560;
  margin-bottom: 12px;
}

.card-boundary {
  display: block;
  padding-top: 12px;
  border-top: 1px solid #E4E8EB;
  font-size: 13px;
  line-height: 1.6;
  color: #6B7680;
}

/* 服务边界 */
.service-boundary {
  margin-top: 48px;
}

.table-wrap {
  overflow-x: auto;
  border: 1px solid #D8DDE3;
  border-radius: 8px;
  background-color: #FFFFFF;
}

.boundary-table {
  min-width: 600px;
}

.table-wrap .boundary-table th,
.table-wrap .boundary-table td {
  padding: 14px 16px;
}

.boundary-table th {
  background-color: #F7F9FA;
  font-weight: 600;
  color: #232A31;
  border-bottom: 2px solid #E4E8EB;
}

.boundary-table td {
  border-bottom: 1px solid #E4E8EB;
  color: #4A5560;
}

.boundary-table tr:last-child td {
  border-bottom: none;
}

.boundary-note {
  margin-top: 16px;
  font-size: 14px;
  line-height: 1.7;
  color: #6B7680;
}

.boundary-note a {
  font-weight: 600;
}

/* 页内相关链接 */
.in-content-links {
  margin-top: 36px;
  padding: 20px 24px;
  background-color: #F7F9FA;
  border: 1px solid #E4E8EB;
  border-radius: 8px;
}

.in-content-links p {
  font-size: 15px;
  line-height: 1.7;
  color: #4A5560;
}

.in-content-links a {
  display: inline-block;
  margin-right: 16px;
  font-weight: 600;
  color: #0F766E;
}

/* 侧栏引导 */
.sidebar-links li a {
  display: block;
  padding: 8px 0;
  font-size: 14px;
  line-height: 1.6;
  color: #4A5560;
  border-bottom: 1px solid #F0F2F4;
  transition: color 0.2s ease, padding-left 0.2s ease;
}

.sidebar-links li:last-child a {
  border-bottom: none;
}

.sidebar-links li a:hover {
  color: #0F766E;
  padding-left: 4px;
}

/* ============================================================
   Pages — 应用场景 91cm/scenes.html
   ============================================================ */

/* 场景引导区 */
.scene-lead {
  margin-bottom: 48px;
}

.lead-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  align-items: center;
  background-color: #FFFFFF;
  border: 1px solid #E4E8EB;
  border-radius: 8px;
  overflow: hidden;
}

.lead-media {
  min-width: 0;
  background-color: #E8ECEF;
}

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

.lead-text {
  padding: 24px 28px;
  min-width: 0;
}

.lead-text p {
  font-size: 15px;
  line-height: 1.8;
  color: #4A5560;
  margin-bottom: 12px;
}

.lead-text p:last-child {
  margin-bottom: 0;
}

/* 场景块 */
.scene-block {
  margin-bottom: 48px;
}

.scene-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  align-items: center;
}

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

.scene-block-2 .scene-inner {
  grid-template-columns: 1fr 1fr;
}

.scene-block-3 .scene-inner {
  grid-template-columns: 1fr 1fr;
}

.scene-block .scene-media {
  min-width: 0;
  background-color: #E8ECEF;
  border-radius: 8px;
  overflow: hidden;
}

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

.scene-block .scene-content h2 {
  font-size: 22px;
  font-weight: 700;
  color: #232A31;
  margin-bottom: 12px;
}

.scene-block .scene-content p {
  font-size: 15px;
  line-height: 1.75;
  color: #4A5560;
  margin-bottom: 16px;
}

.scene-points {
  margin-bottom: 16px;
}

.scene-points li {
  position: relative;
  padding-left: 20px;
  margin-bottom: 8px;
  font-size: 15px;
  line-height: 1.7;
  color: #4A5560;
}

.scene-points li::before {
  content: "";
  position: absolute;
  top: 10px;
  left: 0;
  width: 6px;
  height: 6px;
  background-color: #0F766E;
  border-radius: 50%;
}

/* 反向布局：交替 */
.scene-block-2 .scene-inner {
  direction: rtl;
}

.scene-block-2 .scene-inner > * {
  direction: ltr;
}

/* 模块组合表 */
.combo-table {
  margin: 48px 0;
  padding: 32px;
  background-color: #FFFFFF;
  border: 1px solid #D8DDE3;
  border-radius: 8px;
}

.combo-table h2 {
  margin-bottom: 8px;
}

.combo-table p {
  font-size: 15px;
  color: #4A5560;
  margin-bottom: 20px;
}

.scenes-table {
  overflow-x: auto;
}

.combo-table th,
.combo-table td {
  padding: 14px 16px;
}

.combo-table td {
  font-size: 14px;
  line-height: 1.6;
  color: #4A5560;
}

/* 页尾 CTA */
.page-cta {
  margin-top: 48px;
  padding: 40px;
  text-align: center;
  background-color: #F7F9FA;
  border: 1px solid #E4E8EB;
  border-radius: 8px;
}

.page-cta p {
  max-width: 560px;
  margin: 0 auto 24px;
  font-size: 16px;
  line-height: 1.8;
  color: #4A5560;
}

.page-cta a {
  display: inline-block;
  margin: 0 8px 12px;
  padding: 10px 24px;
  font-size: 15px;
  font-weight: 600;
  color: #FFFFFF;
  background-color: #0F766E;
  border: 1px solid #0F766E;
  border-radius: 6px;
  transition: background-color 0.2s ease;
}

.page-cta a:hover {
  background-color: #0B5C56;
}

/* ============================================================
   Pages — 合作流程 91cm/process.html
   ============================================================ */

.process-intro p {
  font-size: 15px;
  line-height: 1.8;
  color: #4A5560;
  margin-bottom: 16px;
}

.media-figure {
  margin: 24px 0;
  background-color: #E8ECEF;
  border-radius: 8px;
  overflow: hidden;
}

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

/* 时间线列表（流程页） */
.timeline-wrap {
  margin-top: 40px;
}

.timeline-list {
  position: relative;
  padding-left: 28px;
}

.timeline-list::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 8px;
  width: 2px;
  background-color: #D8DDE3;
}

.timeline-list .timeline-item {
  position: relative;
  padding: 0 0 32px 24px;
}

.timeline-list .timeline-marker {
  position: absolute;
  top: 6px;
  left: -28px;
  width: 16px;
  height: 16px;
  background-color: #0F766E;
  border: 3px solid #FFFFFF;
  border-radius: 50%;
  box-shadow: 0 0 0 2px #0F766E;
}

.timeline-list .timeline-card {
  background-color: #FFFFFF;
  border: 1px solid #D8DDE3;
  border-radius: 8px;
  padding: 24px;
  min-height: 0;
}

.timeline-list .timeline-card h3 {
  font-size: 18px;
  font-weight: 700;
  color: #232A31;
  margin-bottom: 12px;
}

.stage-duration {
  display: inline-block;
  margin-bottom: 12px;
  padding: 2px 12px;
  font-size: 13px;
  font-weight: 500;
  color: #0F766E;
  background-color: #E6F2F0;
  border-radius: 12px;
}

.stage-content p {
  font-size: 14px;
  line-height: 1.75;
  color: #4A5560;
  margin-bottom: 8px;
}

.stage-confirm {
  display: block;
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid #E4E8EB;
  font-size: 14px;
  line-height: 1.7;
  color: #4A5560;
}

.stage-confirm strong {
  color: #232A31;
  font-weight: 600;
}

/* 启动前检查清单 */
.start-checklist {
  margin-top: 40px;
  padding: 32px;
  background-color: #FFFFFF;
  border: 1px solid #D8DDE3;
  border-radius: 8px;
}

.checklist-list {
  margin-top: 16px;
}

.checklist-list li {
  position: relative;
  padding: 8px 0 8px 36px;
  font-size: 15px;
  line-height: 1.7;
  color: #4A5560;
  border-bottom: 1px solid #F0F2F4;
}

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

.checklist-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  top: 8px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  font-size: 14px;
  font-weight: 600;
  color: #0F766E;
  background-color: #E6F2F0;
  border-radius: 4px;
}

.checklist-tip {
  margin-top: 16px;
  padding: 12px 16px;
  font-size: 14px;
  line-height: 1.7;
  color: #6B7680;
  background-color: #F7F9FA;
  border-radius: 6px;
}

.checklist-tip a {
  font-weight: 600;
  color: #0F766E;
}

/* 阶段提醒 */
.stage-tip {
  margin-bottom: 24px;
}

.tip-card {
  padding: 16px;
  margin-bottom: 12px;
  background-color: #F7F9FA;
  border: 1px solid #E4E8EB;
  border-radius: 6px;
}

.tip-card:last-child {
  margin-bottom: 0;
}

.tip-label {
  display: block;
  margin-bottom: 6px;
  font-size: 13px;
  font-weight: 600;
  color: #0F766E;
}

.tip-label::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  margin-right: 8px;
  background-color: #0F766E;
  border-radius: 50%;
}

.tip-card p:last-child {
  font-size: 14px;
  line-height: 1.7;
  color: #4A5560;
}

/* ============================================================
   Pages — 客户指南 91cm/guide.html
   ============================================================ */

/* 检查清单 */
.checklist-block {
  margin-bottom: 40px;
}

.checklist {
  margin-top: 16px;
}

.checklist li {
  position: relative;
  padding: 12px 0 12px 36px;
  border-bottom: 1px solid #F0F2F4;
}

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

.checklist li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 18px;
  display: block;
  width: 20px;
  height: 20px;
  border: 1px solid #B0B8C0;
  border-radius: 4px;
  background-color: #FFFFFF;
}

.check-item-title {
  display: block;
  font-size: 15px;
  font-weight: 600;
  color: #232A31;
  margin-bottom: 4px;
}

.checklist li p {
  font-size: 14px;
  line-height: 1.7;
  color: #4A5560;
}

/* FAQ 分类 */
.faq-category {
  margin-bottom: 32px;
}

.faq-category h3 {
  font-size: 18px;
  font-weight: 700;
  color: #232A31;
  margin: 28px 0 16px;
  padding-left: 12px;
  border-left: 3px solid #0F766E;
}

.faq-category .faq-item summary {
  padding: 14px 18px;
  font-size: 15px;
}

.faq-category .faq-item p {
  padding: 0 18px 14px;
  font-size: 14px;
}

/* 文内配图 */
.content-media-inline {
  margin: 32px 0;
  background-color: #E8ECEF;
  border-radius: 8px;
  overflow: hidden;
}

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

/* 侧栏资源与相关页面 */
.resource-links ul li a {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 0;
  font-size: 14px;
  line-height: 1.6;
  color: #4A5560;
  border-bottom: 1px solid #F0F2F4;
  transition: color 0.2s ease;
}

.resource-links ul li:last-child a {
  border-bottom: none;
}

.resource-links ul li a::before {
  content: "›";
  color: #0F766E;
  font-weight: 600;
}

.resource-links ul li a:hover {
  color: #0F766E;
}

/* ============================================================
   Pages — 关于我们 91cm/about.html
   ============================================================ */

/* 定位陈述 */
.position-statement {
  margin-bottom: 48px;
}

.statement-wrap {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 32px;
  align-items: center;
}

.statement-copy p {
  font-size: 16px;
  line-height: 1.8;
  color: #4A5560;
  margin-bottom: 16px;
}

.statement-copy p:last-child {
  margin-bottom: 0;
}

.statement-media {
  min-width: 0;
  background-color: #E8ECEF;
  border-radius: 8px;
  overflow: hidden;
}

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

/* 协作架构 */
.work-architecture {
  margin-bottom: 48px;
  padding: 40px;
  background-color: #FFFFFF;
  border: 1px solid #D8DDE3;
  border-radius: 8px;
}

.section-intro {
  font-size: 15px;
  line-height: 1.75;
  color: #4A5560;
  margin-bottom: 28px;
}

.role-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 28px;
}

.role-card {
  padding: 24px;
  background-color: #F7F9FA;
  border: 1px solid #E4E8EB;
  border-radius: 8px;
  border-top: 3px solid #0F766E;
}

.role-card:nth-child(2) {
  border-top-color: #D97706;
}

.role-card:nth-child(3) {
  border-top-color: #2563EB;
}

.role-card h3 {
  font-size: 16px;
  font-weight: 700;
  color: #232A31;
  margin-bottom: 10px;
}

.role-card p {
  font-size: 14px;
  line-height: 1.7;
  color: #4A5560;
}

.architecture-note {
  padding: 16px 20px;
  font-size: 14px;
  line-height: 1.7;
  color: #4A5560;
  background-color: #F7F9FA;
  border-left: 3px solid #0F766E;
  border-radius: 0 6px 6px 0;
}

/* 基本原则卡片 */
.principles-grid {
  margin-bottom: 48px;
}

.principles-list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.principle-card {
  padding: 24px;
  background-color: #FFFFFF;
  border: 1px solid #D8DDE3;
  border-radius: 8px;
  transition: box-shadow 0.2s ease, transform 0.2s ease;
}

.principle-card:hover {
  box-shadow: 0 4px 16px rgba(35, 42, 49, 0.06);
  transform: translateY(-2px);
}

.principle-card h3 {
  position: relative;
  padding-bottom: 12px;
  margin-bottom: 12px;
  font-size: 16px;
  font-weight: 700;
  color: #232A31;
  border-bottom: 1px solid #E4E8EB;
}

.principle-card h3::after {
  content: "";
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 28px;
  height: 2px;
  background-color: #0F766E;
}

.principle-card p {
  font-size: 14px;
  line-height: 1.7;
  color: #4A5560;
}

/* 合作入口 */
.cooperation-entry {
  padding: 40px;
  text-align: center;
  background-color: #F7F9FA;
  border: 1px solid #E4E8EB;
  border-radius: 8px;
}

.cooperation-entry h2 {
  font-size: 22px;
  font-weight: 700;
  color: #232A31;
  margin-bottom: 12px;
}

.cooperation-entry > p {
  max-width: 560px;
  margin: 0 auto 28px;
  font-size: 15px;
  line-height: 1.75;
  color: #4A5560;
}

.entry-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}

.entry-links a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 24px;
  font-size: 15px;
  font-weight: 600;
  color: #0F766E;
  background-color: #FFFFFF;
  border: 1px solid #0F766E;
  border-radius: 6px;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.entry-links a:hover {
  color: #FFFFFF;
  background-color: #0F766E;
}

/* ============================================================
   Pages — 404
   ============================================================ */

.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  padding: 48px 0;
}

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

.error-code {
  font-size: 64px;
  font-weight: 700;
  line-height: 1.2;
  color: #D8DDE3;
  margin-bottom: 16px;
}

.error-panel h1 {
  font-size: 24px;
  font-weight: 700;
  color: #232A31;
  margin-bottom: 12px;
}

.error-panel p {
  font-size: 15px;
  line-height: 1.75;
  color: #4A5560;
  margin-bottom: 28px;
}

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

.error-actions a:not(.btn-primary) {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 20px;
  font-size: 15px;
  font-weight: 500;
  color: #4A5560;
  border: 1px solid #D8DDE3;
  border-radius: 6px;
  background-color: #FFFFFF;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.error-actions a:not(.btn-primary):hover {
  color: #0F766E;
  border-color: #0F766E;
}

/* ============================================================
   Responsive — 平板 ≤1024px
   ============================================================ */
@media (max-width: 1024px) {
  .content-grid {
    grid-template-columns: minmax(0, 1fr) 260px;
    gap: 24px;
  }

  .page-layout.content-grid {
    grid-template-columns: minmax(0, 1fr) 260px;
  }

  .hero-layout {
    gap: 32px;
  }

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

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

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

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

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

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

  .role-card:last-child {
    grid-column: 1 / -1;
  }
}

/* ============================================================
   Responsive — 手机 ≤768px
   ============================================================ */
@media (max-width: 768px) {
  .container {
    padding-left: 16px;
    padding-right: 16px;
  }

  .header-shell {
    height: 60px;
    padding: 0 16px;
  }

  /* 汉堡菜单 */
  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    background-color: #FFFFFF;
    border-bottom: 1px solid #D8DDE3;
    box-shadow: 0 8px 16px rgba(35, 42, 49, 0.06);
  }

  .site-nav .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px 16px;
  }

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

  .site-nav .nav-list a {
    display: block;
    padding: 12px 8px;
    font-size: 15px;
    border-bottom: 1px solid #F0F2F4;
    border-radius: 0;
  }

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

  /* 汉堡按钮动画状态 */
  .nav-toggle[aria-expanded="true"] span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  .nav-toggle[aria-expanded="true"] span:nth-child(2) {
    opacity: 0;
  }

  .nav-toggle[aria-expanded="true"] span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  /* 首页布局 */
  .hero-layout {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .hero-notice {
    padding: 36px 0 28px;
  }

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

  .hero-figure {
    aspect-ratio: 16 / 10;
  }

  .quick-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }

  .quick-card {
    padding: 16px;
  }

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

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

  .scene-reverse {
    direction: ltr;
  }

  .scene-media img {
    min-height: 180px;
  }

  .scene-content {
    padding: 16px 20px 24px;
  }

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

  .timeline-card {
    min-height: 0;
  }

  .cta-links {
    flex-direction: column;
    align-items: center;
  }

  .cta-links a {
    width: 100%;
    max-width: 320px;
  }

  /* 内页 */
  .inner-main {
    padding-top: 20px;
    padding-bottom: 40px;
  }

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

  .page-description {
    font-size: 15px;
  }

  /* 两栏变单栏 */
  .content-grid {
    display: block;
  }

  .page-layout.content-grid {
    display: block;
  }

  .sidebar {
    margin-top: 32px;
  }

  /* 服务页 */
  .service-card-list {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .service-intro p {
    font-size: 15px;
  }

  .table-wrap {
    overflow-x: auto;
  }

  /* 场景页 */
  .lead-content {
    grid-template-columns: 1fr;
  }

  .lead-text {
    padding: 16px 20px 24px;
  }

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

  .scene-block-2 .scene-inner {
    direction: ltr;
  }

  .scene-block-2 .scene-inner > * {
    direction: ltr;
  }

  .scene-block .scene-media img {
    min-height: 180px;
  }

  .combo-table {
    padding: 20px 16px;
    overflow-x: auto;
  }

  .page-cta {
    padding: 28px 20px;
  }

  /* 流程页 */
  .timeline-list {
    padding-left: 20px;
  }

  .timeline-list::before {
    left: 6px;
  }

  .timeline-list .timeline-marker {
    left: -20px;
    width: 14px;
    height: 14px;
  }

  .timeline-list .timeline-item {
    padding-left: 16px;
  }

  .start-checklist {
    padding: 24px 20px;
  }

  /* 指南页 */
  .faq-category {
    margin-bottom: 24px;
  }

  .content-media-inline {
    margin: 24px 0;
  }

  /* 关于页 */
  .statement-wrap {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .statement-media img {
    min-height: 200px;
  }

  .work-architecture {
    padding: 24px 20px;
  }

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

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

  .principles-grid {
    margin-bottom: 32px;
  }

  .cooperation-entry {
    padding: 28px 20px;
  }

  .entry-links {
    flex-direction: column;
    align-items: center;
  }

  .entry-links a {
    width: 100%;
    max-width: 320px;
  }

  /* 页脚 */
  .footer-shell {
    padding: 32px 16px 20px;
  }

  .footer-nav {
    flex-direction: column;
    gap: 16px;
  }

  .footer-nav ul {
    gap: 4px 16px;
  }

  .footer-legal {
    padding-top: 16px;
  }

  /* 相关链接 */
  .related-links {
    padding: 16px;
    gap: 8px 12px;
  }

  .related-links-item {
    padding: 4px 10px;
    font-size: 13px;
  }

  /* 404 */
  .error-code {
    font-size: 48px;
  }

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

  .error-actions a {
    width: 100%;
    max-width: 280px;
  }
}

/* ============================================================
   Responsive — 小屏手机 ≤390px
   ============================================================ */
@media (max-width: 390px) {
  .quick-grid {
    grid-template-columns: 1fr;
  }

  .quick-card {
    padding: 14px;
  }

  .quick-card h3 {
    font-size: 15px;
  }

  .overview-grid .service-card,
  .service-card-list .service-card {
    padding: 20px;
  }

  .scene-content {
    padding: 14px 16px 20px;
  }

  .scene-content h3 {
    font-size: 18px;
  }

  .timeline-card {
    padding: 16px;
  }

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

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

  .footer-brand {
    padding-bottom: 20px;
  }

  .footer-nav {
    padding: 20px 0;
  }

  .footer-nav ul {
    flex-direction: column;
    gap: 0;
  }

  .footer-nav ul li a {
    display: block;
    padding: 6px 0;
  }

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

  .section-title {
    font-size: 21px;
  }

  .checklist li {
    padding-left: 32px;
  }

  .checklist li::before {
    left: 0;
  }

  .checklist-list li {
    padding-left: 32px;
  }

  .checklist-list li::before {
    left: 0;
  }
}

/* 程序验收反馈：修复网格孤项 */
@media (min-width: 769px) {
  .principles-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}