/* ==========================================================
   黑料吃瓜51 - 全站样式表
   极简品牌风 · 白底 · 强调色 #f26130 · 品牌深蓝 #0e3b5c
   ========================================================== */

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

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

body {
  font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: #1a1a1a;
  background: #ffffff;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

a {
  color: #0e3b5c;
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: #f26130;
}

ul,
ol {
  list-style: none;
}

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

/* 视觉隐藏但保留给屏幕阅读器 */
.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 骨架
   ========================================================== */
.site-body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

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

/* ==========================================================
   Header
   ========================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: #ffffff;
  border-bottom: 1px solid #e5e5e5;
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  gap: 24px;
}

.logo {
  font-size: 20px;
  font-weight: 700;
  color: #0e3b5c;
  letter-spacing: 0.02em;
  white-space: nowrap;
  flex-shrink: 0;
}

.logo:hover {
  color: #0e3b5c;
}

/* 主导航 */
.main-nav ul {
  display: flex;
  gap: 4px;
}

.main-nav a {
  display: block;
  padding: 8px 14px;
  font-size: 15px;
  color: #1a1a1a;
  border-radius: 4px;
  transition: color 0.2s, background-color 0.2s;
}

.main-nav a:hover {
  color: #f26130;
  background: rgba(242, 97, 48, 0.06);
}

.main-nav a.is-current {
  color: #f26130;
  font-weight: 600;
}

/* 页头右侧 CTA */
.header-cta {
  display: inline-block;
  padding: 8px 20px;
  background: #f26130;
  color: #ffffff;
  font-size: 14px;
  font-weight: 600;
  border-radius: 4px;
  white-space: nowrap;
  flex-shrink: 0;
  transition: background-color 0.2s;
}

.header-cta:hover {
  background: #d94f1f;
  color: #ffffff;
}

/* 汉堡按钮 */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  gap: 5px;
  flex-shrink: 0;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: #0e3b5c;
  border-radius: 2px;
  transition: transform 0.25s, opacity 0.25s;
}

.nav-toggle.is-active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle.is-active span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.is-active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ==========================================================
   Footer
   ========================================================== */
.site-footer {
  border-top: 1px solid #e5e5e5;
  background: #ffffff;
  margin-top: 40px;
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px 24px 24px;
  display: flex;
  justify-content: space-between;
  gap: 40px;
}

.footer-left {
  max-width: 460px;
}

.footer-brand {
  font-size: 16px;
  font-weight: 700;
  color: #0e3b5c;
  margin-bottom: 8px;
}

.footer-note {
  font-size: 14px;
  color: #6b6b6b;
  line-height: 1.6;
}

.footer-right {
  flex-shrink: 0;
}

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

.footer-links a {
  font-size: 14px;
  color: #6b6b6b;
}

.footer-links a:hover {
  color: #f26130;
}

.footer-bottom {
  border-top: 1px solid #e5e5e5;
  padding: 16px 24px;
  text-align: center;
}

.footer-bottom p {
  font-size: 13px;
  color: #6b6b6b;
}

/* ==========================================================
   通用组件
   ========================================================== */

/* 面包屑 */
.breadcrumb {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px 24px 0;
  font-size: 14px;
  color: #6b6b6b;
}

.breadcrumb a {
  color: #6b6b6b;
}

.breadcrumb a:hover {
  color: #f26130;
}

.breadcrumb-sep {
  margin: 0 8px;
  color: #b0b0b0;
}

.breadcrumb-current {
  color: #1a1a1a;
}

/* 内页页头 */
.page-header {
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px 24px 0;
}

.page-title {
  font-size: 32px;
  font-weight: 700;
  color: #0e3b5c;
  line-height: 1.3;
}

.page-heading {
  max-width: 1200px;
  margin: 0 auto;
  padding: 12px 24px 0;
}

.page-heading p,
.page-title-area p,
.page-intro {
  font-size: 16px;
  color: #6b6b6b;
  max-width: 720px;
  line-height: 1.7;
}

/* 内页统一主容器 */
.inner-main {
  width: 100%;
  padding-bottom: 40px;
}

.inner-main > section,
.inner-main > aside {
  max-width: 1200px;
  margin: 0 auto;
  padding-left: 24px;
  padding-right: 24px;
}

/* 区块标题 */
.inner-main h2 {
  font-size: 24px;
  font-weight: 700;
  color: #0e3b5c;
  margin-bottom: 16px;
  line-height: 1.4;
}

.inner-main h3 {
  font-size: 18px;
  font-weight: 600;
  color: #1a1a1a;
  line-height: 1.5;
}

/* 相关链接导航 */
.related-links {
  max-width: 1200px;
  margin: 0 auto;
  padding: 32px 24px 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 20px;
}

.related-links-label {
  font-size: 14px;
  color: #6b6b6b;
}

.related-links-item {
  font-size: 14px;
  color: #0e3b5c;
  border-bottom: 1px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}

.related-links-item:hover {
  color: #f26130;
  border-bottom-color: #f26130;
}

/* 通用按钮 */
.btn-primary {
  display: inline-block;
  padding: 10px 28px;
  background: #f26130;
  color: #ffffff;
  font-size: 15px;
  font-weight: 600;
  border-radius: 4px;
  transition: background-color 0.2s;
}

.btn-primary:hover {
  background: #d94f1f;
  color: #ffffff;
}

.btn-secondary {
  display: inline-block;
  padding: 10px 28px;
  background: transparent;
  color: #0e3b5c;
  font-size: 15px;
  font-weight: 600;
  border: 1px solid #0e3b5c;
  border-radius: 4px;
  transition: background-color 0.2s, color 0.2s;
}

.btn-secondary:hover {
  background: #0e3b5c;
  color: #ffffff;
}

/* ==========================================================
   首页 Hero
   ========================================================== */
.hero-section {
  border-bottom: 1px solid #e5e5e5;
}

.hero-layout {
  max-width: 1200px;
  margin: 0 auto;
  padding: 56px 24px 64px;
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 48px;
  align-items: start;
}

/* 左侧章节索引 */
.hero-index {
  position: sticky;
  top: 88px;
  padding: 24px 0;
}

.hero-index h2 {
  font-size: 14px;
  font-weight: 600;
  color: #6b6b6b;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 16px;
}

.hero-index ul {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.hero-index a {
  display: block;
  padding: 8px 12px;
  font-size: 15px;
  color: #1a1a1a;
  border-left: 2px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}

.hero-index a:hover {
  color: #f26130;
  border-left-color: #f26130;
}

/* 右侧主内容 */
.hero-main {
  min-width: 0;
}

.hero-text {
  margin-bottom: 32px;
}

.hero-text h1 {
  font-size: 32px;
  font-weight: 700;
  color: #0e3b5c;
  line-height: 1.3;
  margin-bottom: 16px;
}

.hero-lead {
  font-size: 18px;
  font-weight: 600;
  color: #1a1a1a;
  margin-bottom: 12px;
}

.hero-desc {
  font-size: 16px;
  color: #6b6b6b;
  max-width: 640px;
  margin-bottom: 24px;
}

.hero-cta {
  display: inline-block;
  padding: 12px 32px;
  background: #f26130;
  color: #ffffff;
  font-size: 16px;
  font-weight: 600;
  border-radius: 4px;
  transition: background-color 0.2s;
}

.hero-cta:hover {
  background: #d94f1f;
  color: #ffffff;
}

.hero-figure {
  margin-top: 8px;
  border-radius: 8px;
  overflow: hidden;
}

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

/* ==========================================================
   首页棋盘式图文交替
   ========================================================== */
.chess-section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 64px 24px;
  display: flex;
  flex-direction: column;
  gap: 56px;
}

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

.chess-image {
  border-radius: 8px;
  overflow: hidden;
}

.chess-image img {
  width: 100%;
  height: 280px;
  object-fit: cover;
}

.chess-content h2 {
  font-size: 24px;
  font-weight: 700;
  color: #0e3b5c;
  margin-bottom: 12px;
}

.chess-content p {
  font-size: 16px;
  color: #6b6b6b;
  line-height: 1.7;
  margin-bottom: 12px;
}

.chess-content p:last-child {
  margin-bottom: 0;
}

/* ==========================================================
   首页服务摘要
   ========================================================== */
.services-summary {
  background: #f7f8fa;
  border-top: 1px solid #e5e5e5;
  border-bottom: 1px solid #e5e5e5;
  padding: 64px 0;
}

.services-summary .section-head,
.approach-preview .section-head,
.faq-preview .section-head {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  margin-bottom: 32px;
}

.section-head h2 {
  font-size: 24px;
  font-weight: 700;
  color: #0e3b5c;
  margin-bottom: 8px;
}

.section-head p {
  font-size: 16px;
  color: #6b6b6b;
  max-width: 640px;
}

.services-list {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px 40px;
}

.service-item {
  padding: 20px 0;
  border-bottom: 1px solid #e5e5e5;
}

.service-item dt {
  margin-bottom: 8px;
}

.service-item dt a {
  font-size: 18px;
  font-weight: 600;
  color: #0e3b5c;
}

.service-item dt a:hover {
  color: #f26130;
}

.service-item dd {
  font-size: 15px;
  color: #6b6b6b;
  line-height: 1.6;
}

.section-link {
  display: inline-block;
  margin: 32px 24px 0;
  font-size: 15px;
  font-weight: 600;
  color: #f26130;
  border-bottom: 1px solid transparent;
}

.section-link:hover {
  border-bottom-color: #f26130;
}

/* ==========================================================
   首页实施阶段预览（垂直时间线）
   ========================================================== */
.approach-preview {
  padding: 64px 0;
}

.timeline-list {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
}

.timeline-list::before {
  content: '';
  position: absolute;
  left: 8px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: #e5e5e5;
}

.timeline-item {
  position: relative;
  padding: 0 0 32px 40px;
}

.timeline-item:last-child {
  padding-bottom: 0;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: 2px;
  top: 8px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: #f26130;
  border: 3px solid #ffffff;
  box-shadow: 0 0 0 2px #f26130;
}

.timeline-item h3 {
  font-size: 18px;
  font-weight: 600;
  color: #1a1a1a;
  margin-bottom: 6px;
}

.timeline-item p {
  font-size: 15px;
  color: #6b6b6b;
  line-height: 1.6;
  max-width: 640px;
}

/* ==========================================================
   首页 FAQ 速览
   ========================================================== */
.faq-preview {
  background: #f7f8fa;
  border-top: 1px solid #e5e5e5;
  border-bottom: 1px solid #e5e5e5;
  padding: 64px 0;
}

.faq-preview .faq-item {
  max-width: 1200px;
  margin: 0 auto 12px;
  padding: 0 24px;
}

.faq-preview details {
  background: #ffffff;
  border: 1px solid #e5e5e5;
  border-radius: 8px;
  padding: 16px 20px;
}

.faq-preview summary {
  font-size: 16px;
  font-weight: 600;
  color: #1a1a1a;
  cursor: pointer;
  list-style: none;
  position: relative;
  padding-right: 32px;
}

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

.faq-preview summary::after {
  content: '+';
  position: absolute;
  right: 4px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 20px;
  color: #f26130;
  transition: transform 0.2s;
}

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

.faq-preview details p {
  margin-top: 12px;
  font-size: 15px;
  color: #6b6b6b;
  line-height: 1.6;
}

/* ==========================================================
   首页合作准备引导
   ========================================================== */
.cooperation-guide {
  max-width: 1200px;
  margin: 0 auto;
  padding: 64px 24px;
  text-align: left;
}

.cooperation-guide h2 {
  font-size: 24px;
  font-weight: 700;
  color: #0e3b5c;
  margin-bottom: 12px;
}

.cooperation-guide p {
  font-size: 16px;
  color: #6b6b6b;
  max-width: 640px;
  margin-bottom: 24px;
}

.section-cta {
  display: inline-block;
  padding: 10px 28px;
  background: #f26130;
  color: #ffffff;
  font-size: 15px;
  font-weight: 600;
  border-radius: 4px;
}

.section-cta:hover {
  background: #d94f1f;
  color: #ffffff;
}

/* ==========================================================
   服务能力页
   ========================================================== */
.services-grid {
  padding-top: 40px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.service-module {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 32px;
  align-items: center;
  padding: 28px;
  border: 1px solid #e5e5e5;
  border-radius: 8px;
  background: #ffffff;
}

.service-text {
  min-width: 0;
}

.service-text h3 {
  font-size: 20px;
  font-weight: 700;
  color: #0e3b5c;
  margin-bottom: 12px;
}

.service-text p {
  font-size: 15px;
  color: #6b6b6b;
  line-height: 1.6;
  margin-bottom: 8px;
}

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

.service-visual figure {
  border-radius: 8px;
  overflow: hidden;
}

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

/* 服务边界提示条 */
.service-boundary {
  margin-top: 40px;
  padding: 20px 24px;
  border-left: 4px solid #f26130;
  background: #f7f8fa;
  font-size: 15px;
  color: #6b6b6b;
  line-height: 1.6;
}

.service-boundary strong {
  color: #1a1a1a;
  font-weight: 600;
}

/* 内页相关链接 */
.inner-links {
  padding-top: 40px;
}

.inner-links h2 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 12px;
}

.inner-links ul {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
}

.inner-links a {
  font-size: 15px;
  color: #0e3b5c;
  border-bottom: 1px solid transparent;
}

.inner-links a:hover {
  color: #f26130;
  border-bottom-color: #f26130;
}

/* ==========================================================
   实施方法页
   ========================================================== */
.approach-intro {
  padding-top: 40px;
  display: grid;
  grid-template-columns: 1fr 360px;
  gap: 40px;
  align-items: center;
}

.approach-intro-text p {
  font-size: 16px;
  color: #6b6b6b;
  line-height: 1.7;
  margin-bottom: 12px;
}

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

.approach-figure {
  border-radius: 8px;
  overflow: hidden;
}

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

.approach-figure figcaption {
  font-size: 13px;
  color: #6b6b6b;
  padding: 8px 4px 0;
  text-align: center;
}

/* 阶段总览 */
.phase-overview {
  padding-top: 56px;
}

.section-lead {
  font-size: 15px;
  color: #6b6b6b;
  margin-bottom: 24px;
  max-width: 720px;
}

.phase-list {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.phase-item {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 20px;
  padding: 24px;
  background: #f7f8fa;
  border-radius: 8px;
  border-left: 3px solid #0e3b5c;
}

.phase-number {
  font-size: 28px;
  font-weight: 700;
  color: #f26130;
  line-height: 1.2;
}

.phase-content h3 {
  font-size: 18px;
  font-weight: 600;
  color: #1a1a1a;
  margin-bottom: 8px;
}

.phase-content p {
  font-size: 15px;
  color: #6b6b6b;
  line-height: 1.6;
  margin-bottom: 8px;
}

.phase-deliverable {
  font-size: 14px;
}

.phase-deliverable strong {
  color: #0e3b5c;
  font-weight: 600;
}

/* 项目输入表格 */
.input-requirements {
  padding-top: 56px;
}

.input-table-wrapper {
  overflow-x: auto;
  border: 1px solid #e5e5e5;
  border-radius: 8px;
}

.input-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.input-table th,
.input-table td {
  padding: 14px 16px;
  text-align: left;
  border-bottom: 1px solid #e5e5e5;
  vertical-align: top;
  line-height: 1.6;
}

.input-table thead th {
  background: #f7f8fa;
  color: #0e3b5c;
  font-weight: 600;
  white-space: nowrap;
}

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

.input-table tbody th {
  color: #1a1a1a;
  font-weight: 600;
  white-space: nowrap;
  background: #fafafa;
}

.input-table td {
  color: #6b6b6b;
}

.input-note {
  margin-top: 16px;
  font-size: 14px;
  color: #6b6b6b;
}

/* 下一步指引 */
.next-step-guide {
  padding-top: 56px;
}

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

/* ==========================================================
   合作指南页
   ========================================================== */
.cooperation-intro {
  padding-top: 40px;
  display: grid;
  grid-template-columns: 1fr 360px;
  gap: 40px;
  align-items: center;
}

.cooperation-text h2 {
  font-size: 24px;
  font-weight: 700;
  color: #0e3b5c;
  margin-bottom: 12px;
}

.cooperation-text p {
  font-size: 16px;
  color: #6b6b6b;
  line-height: 1.7;
}

.cooperation-figure {
  border-radius: 8px;
  overflow: hidden;
}

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

.cooperation-figure figcaption {
  font-size: 13px;
  color: #6b6b6b;
  padding: 8px 4px 0;
  text-align: center;
}

/* 需求类型卡片 */
.demand-types {
  padding-top: 56px;
}

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

.demand-card {
  padding: 24px;
  border: 1px solid #e5e5e5;
  border-radius: 8px;
  background: #ffffff;
  transition: box-shadow 0.2s, border-color 0.2s;
}

.demand-card:hover {
  border-color: #f26130;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
}

.demand-card h3 {
  font-size: 17px;
  font-weight: 600;
  color: #0e3b5c;
  margin-bottom: 10px;
}

.demand-card p {
  font-size: 14px;
  color: #6b6b6b;
  line-height: 1.6;
  margin-bottom: 8px;
}

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

/* 准备清单 */
.preparation-list {
  padding-top: 56px;
}

.checklist {
  display: flex;
  flex-direction: column;
  gap: 12px;
  counter-reset: checklist-counter;
}

.checklist li {
  position: relative;
  padding: 16px 20px 16px 56px;
  background: #f7f8fa;
  border-radius: 8px;
  font-size: 15px;
  color: #1a1a1a;
  line-height: 1.6;
  counter-increment: checklist-counter;
}

.checklist li::before {
  content: counter(checklist-counter, decimal-leading-zero);
  position: absolute;
  left: 20px;
  top: 16px;
  font-size: 18px;
  font-weight: 700;
  color: #f26130;
}

/* 下一步 */
.next-step {
  padding-top: 56px;
}

.next-step-actions {
  display: flex;
  gap: 16px;
  margin-top: 20px;
  flex-wrap: wrap;
}

/* ==========================================================
   FAQ 页
   ========================================================== */
.faq-section {
  padding-top: 48px;
}

.faq-section h2 {
  font-size: 22px;
  font-weight: 700;
  color: #0e3b5c;
  margin-bottom: 20px;
  border-bottom: 2px solid #e5e5e5;
  padding-bottom: 10px;
}

/* 分类内嵌图片 */
.content-media-inline {
  margin-bottom: 20px;
  border-radius: 8px;
  overflow: hidden;
}

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

.content-media-inline figcaption {
  font-size: 13px;
  color: #6b6b6b;
  padding: 8px 4px 0;
  text-align: center;
}

/* FAQ 列表 */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-item details {
  border: 1px solid #e5e5e5;
  border-radius: 8px;
  background: #ffffff;
  padding: 16px 20px;
  transition: border-color 0.2s;
}

.faq-item details:hover {
  border-color: #d0d0d0;
}

.faq-item details[open] {
  border-color: #f26130;
}

.faq-item summary {
  font-size: 16px;
  font-weight: 600;
  color: #1a1a1a;
  cursor: pointer;
  list-style: none;
  position: relative;
  padding-right: 32px;
  line-height: 1.5;
}

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

.faq-item summary::after {
  content: '+';
  position: absolute;
  right: 4px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 20px;
  color: #f26130;
  transition: transform 0.2s;
}

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

.faq-answer {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid #e5e5e5;
}

.faq-answer p {
  font-size: 15px;
  color: #6b6b6b;
  line-height: 1.7;
}

/* 未解决问题 */
.faq-next-step {
  background: #f7f8fa;
  border-radius: 8px;
  padding: 32px;
  margin-top: 48px;
}

.faq-next-step h2 {
  border-bottom: none;
  padding-bottom: 0;
  margin-bottom: 12px;
}

.faq-next-content p {
  font-size: 15px;
  color: #6b6b6b;
  line-height: 1.7;
  margin-bottom: 16px;
}

.faq-next-links {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

/* ==========================================================
   关于我们页
   ========================================================== */
.about-position {
  padding-top: 40px;
  display: grid;
  grid-template-columns: 1fr 360px;
  gap: 40px;
  align-items: center;
}

.about-position-text h2 {
  font-size: 24px;
  font-weight: 700;
  color: #0e3b5c;
  margin-bottom: 12px;
}

.about-position-text p {
  font-size: 16px;
  color: #6b6b6b;
  line-height: 1.7;
  margin-bottom: 12px;
}

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

.about-position-media {
  border-radius: 8px;
  overflow: hidden;
}

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

.about-position-media figcaption {
  font-size: 13px;
  color: #6b6b6b;
  padding: 8px 4px 0;
  text-align: center;
}

/* 原则网格 */
.about-principles {
  padding-top: 56px;
}

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

.principle-item {
  padding: 24px;
  background: #f7f8fa;
  border-radius: 8px;
  border-top: 3px solid #0e3b5c;
}

.principle-item h3 {
  font-size: 16px;
  font-weight: 600;
  color: #0e3b5c;
  margin-bottom: 8px;
}

.principle-item p {
  font-size: 14px;
  color: #6b6b6b;
  line-height: 1.6;
}

/* 服务边界声明 */
.about-boundary {
  padding-top: 56px;
}

.boundary-content {
  background: #f7f8fa;
  border-left: 4px solid #f26130;
  border-radius: 0 8px 8px 0;
  padding: 28px;
}

.boundary-content p {
  font-size: 15px;
  color: #1a1a1a;
  line-height: 1.7;
  margin-bottom: 16px;
}

.boundary-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 16px;
}

.boundary-list li {
  position: relative;
  padding-left: 24px;
  font-size: 15px;
  color: #6b6b6b;
  line-height: 1.6;
}

.boundary-list li::before {
  content: '·';
  position: absolute;
  left: 8px;
  top: 0;
  font-size: 20px;
  font-weight: 700;
  color: #f26130;
}

.boundary-content p:last-child {
  margin-bottom: 0;
}

/* 网站栏目说明 */
.about-site-guide {
  padding-top: 56px;
}

.guide-intro {
  font-size: 15px;
  color: #6b6b6b;
  margin-bottom: 20px;
}

.site-guide-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.site-guide-list li {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding: 10px 0;
  border-bottom: 1px solid #e5e5e5;
  font-size: 15px;
}

.site-guide-list a {
  font-weight: 600;
  color: #0e3b5c;
  white-space: nowrap;
  flex-shrink: 0;
  min-width: 100px;
}

.site-guide-list a:hover {
  color: #f26130;
}

.site-guide-list span {
  color: #6b6b6b;
  line-height: 1.6;
}

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

.error-section {
  text-align: center;
  padding: 48px 24px;
  max-width: 560px;
}

.error-code {
  font-size: 72px;
  font-weight: 700;
  color: #f26130;
  line-height: 1;
  margin-bottom: 16px;
}

.error-section h1 {
  font-size: 28px;
  font-weight: 700;
  color: #0e3b5c;
  margin-bottom: 12px;
}

.error-desc {
  font-size: 16px;
  color: #6b6b6b;
  margin-bottom: 24px;
}

.error-btn {
  display: inline-block;
  padding: 10px 28px;
  background: #f26130;
  color: #ffffff;
  font-size: 15px;
  font-weight: 600;
  border-radius: 4px;
}

.error-btn:hover {
  background: #d94f1f;
  color: #ffffff;
}

/* ==========================================================
   响应式
   ========================================================== */

/* 平板 */
@media (max-width: 1024px) {
  .hero-layout {
    grid-template-columns: 180px 1fr;
    gap: 32px;
  }

  .service-module {
    grid-template-columns: 1fr 260px;
  }

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

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

  .approach-intro,
  .cooperation-intro,
  .about-position {
    grid-template-columns: 1fr 280px;
    gap: 24px;
  }
}

/* 手机端 */
@media (max-width: 768px) {
  /* 页头 */
  .header-inner {
    height: 60px;
    padding: 0 16px;
    gap: 12px;
  }

  .logo {
    font-size: 18px;
  }

  .nav-toggle {
    display: flex;
  }

  .main-nav {
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    background: #ffffff;
    border-bottom: 1px solid #e5e5e5;
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.08);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
  }

  .main-nav.is-open {
    max-height: 360px;
  }

  .main-nav ul {
    flex-direction: column;
    padding: 8px 16px 16px;
    gap: 2px;
  }

  .main-nav a {
    padding: 12px 14px;
    font-size: 16px;
    border-radius: 4px;
  }

  .header-cta {
    display: none;
  }

  /* 面包屑 */
  .breadcrumb {
    padding: 16px 16px 0;
  }

  /* 页头 */
  .page-header {
    padding: 28px 16px 0;
  }

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

  .page-heading {
    padding: 10px 16px 0;
  }

  .inner-main > section,
  .inner-main > aside {
    padding-left: 16px;
    padding-right: 16px;
  }

  /* 首页 Hero */
  .hero-layout {
    grid-template-columns: 1fr;
    padding: 32px 16px 48px;
    gap: 24px;
  }

  .hero-index {
    position: static;
    order: 2;
    padding: 0;
  }

  .hero-index ul {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 8px;
  }

  .hero-index a {
    border-left: none;
    border-bottom: 2px solid transparent;
    padding: 6px 10px;
    font-size: 14px;
  }

  .hero-index a:hover {
    border-left: none;
    border-bottom-color: #f26130;
  }

  .hero-main {
    order: 1;
  }

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

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

  /* 棋盘区 */
  .chess-section {
    padding: 48px 16px;
    gap: 40px;
  }

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

  .chess-image img {
    height: 200px;
  }

  /* 服务摘要 */
  .services-summary {
    padding: 48px 0;
  }

  .services-list {
    grid-template-columns: 1fr;
    padding: 0 16px;
  }

  .services-summary .section-head,
  .approach-preview .section-head,
  .faq-preview .section-head {
    padding: 0 16px;
  }

  .section-link {
    margin-left: 16px;
    margin-right: 16px;
  }

  /* 时间线 */
  .approach-preview {
    padding: 48px 0;
  }

  .timeline-list {
    padding: 0 16px;
  }

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

  .faq-preview .faq-item {
    padding: 0 16px;
  }

  /* 合作引导 */
  .cooperation-guide {
    padding: 48px 16px;
  }

  /* 页脚 */
  .footer-inner {
    flex-direction: column;
    gap: 24px;
    padding: 32px 16px 20px;
  }

  .footer-links {
    gap: 8px 16px;
  }

  .footer-bottom {
    padding: 14px 16px;
  }

  /* 服务能力页 */
  .services-grid {
    padding-top: 32px;
    gap: 20px;
  }

  .service-module {
    grid-template-columns: 1fr;
    padding: 20px;
    gap: 16px;
  }

  .service-visual img {
    height: 180px;
  }

  .service-boundary {
    margin-top: 24px;
    padding: 16px 20px;
  }

  /* 实施方法页 */
  .approach-intro {
    grid-template-columns: 1fr;
    padding-top: 32px;
    gap: 20px;
  }

  .approach-figure img {
    height: 200px;
  }

  .phase-overview {
    padding-top: 40px;
  }

  .phase-item {
    grid-template-columns: 1fr;
    gap: 8px;
    padding: 20px;
  }

  .phase-number {
    font-size: 22px;
  }

  .input-requirements {
    padding-top: 40px;
  }

  .input-table th,
  .input-table td {
    padding: 10px 12px;
    font-size: 13px;
  }

  .next-step-guide {
    padding-top: 40px;
  }

  /* 合作指南页 */
  .cooperation-intro {
    grid-template-columns: 1fr;
    padding-top: 32px;
    gap: 20px;
  }

  .cooperation-figure img {
    height: 200px;
  }

  .demand-types {
    padding-top: 40px;
  }

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

  .preparation-list {
    padding-top: 40px;
  }

  .next-step {
    padding-top: 40px;
  }

  /* FAQ 页 */
  .faq-section {
    padding-top: 36px;
  }

  .faq-section h2 {
    font-size: 20px;
  }

  .content-media-inline img {
    height: 180px;
  }

  .faq-next-step {
    padding: 24px;
    margin-top: 36px;
  }

  /* 关于页 */
  .about-position {
    grid-template-columns: 1fr;
    padding-top: 32px;
    gap: 20px;
  }

  .about-position-media img {
    height: 200px;
  }

  .about-principles {
    padding-top: 40px;
  }

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

  .about-boundary {
    padding-top: 40px;
  }

  .boundary-content {
    padding: 20px;
  }

  .about-site-guide {
    padding-top: 40px;
  }

  .site-guide-list li {
    flex-direction: column;
    gap: 4px;
    padding: 12px 0;
  }

  .site-guide-list a {
    min-width: 0;
  }

  /* 404 */
  .error-code {
    font-size: 56px;
  }
}

/* 小屏手机 */
@media (max-width: 480px) {
  .demand-grid {
    grid-template-columns: 1fr;
  }

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

  .hero-cta {
    width: 100%;
    text-align: center;
  }

  .section-cta {
    width: 100%;
    text-align: center;
  }

  .btn-primary,
  .btn-secondary {
    width: 100%;
    text-align: center;
  }

  .error-btn {
    width: 100%;
    text-align: center;
  }
}