/* ============================================================
   国产黑料吃瓜 · bangdan5.com 整站样式表
   法律专业风：稳重、规则、清晰
   ============================================================ */

/* ============================================================
   Base — 基础变量、重置与全局字体
   ============================================================ */
:root {
  --color-primary: #16324a;
  --color-bg: #f6f3ee;
  --color-text: #2c2c2c;
  --color-accent: #9a6b44;
  --color-line: #d9d4cb;
  --color-muted: #6b6b6b;
  --color-white: #ffffff;
  --font-serif: "Noto Serif SC", "Songti SC", "SimSun", serif;
  --font-sans: "Noto Sans SC", "Microsoft YaHei", "PingFang SC", sans-serif;
  --container-width: 1100px;
  --content-width: 860px;
  --radius: 6px;
  --space-section: 64px;
  --space-mobile: 32px;
}

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

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

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.8;
  font-size: 16px;
  min-width: 320px;
}

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

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

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

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-serif);
  color: var(--color-primary);
  font-weight: 700;
  line-height: 1.4;
}

h1 {
  font-size: 32px;
}

h2 {
  font-size: 24px;
}

h3 {
  font-size: 18px;
}

p {
  margin-bottom: 12px;
}

/* 图片容器稳定约束 */
figure {
  margin: 0;
}

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

/* ============================================================
   Layout — 全站统一版心、页头、页脚骨架
   ============================================================ */

.site-header {
  background-color: var(--color-white);
  border-bottom: 1px solid var(--color-line);
  position: relative;
  z-index: 100;
}

.header-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand-link {
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex-shrink: 0;
}

.brand-name {
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.2;
}

.brand-slogan {
  font-size: 12px;
  color: var(--color-muted);
  line-height: 1.2;
  letter-spacing: 0.02em;
}

/* 主导航 */
.primary-nav {
  flex: 1;
  display: flex;
  justify-content: flex-end;
}

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

.nav-item {
  position: relative;
}

.nav-link {
  display: block;
  padding: 8px 14px;
  font-size: 15px;
  color: var(--color-text);
  border-bottom: 2px solid transparent;
  transition: border-color 0.2s ease, color 0.2s ease;
}

.nav-link:hover {
  color: var(--color-primary);
  border-bottom-color: var(--color-accent);
}

.nav-link.is-current {
  color: var(--color-primary);
  font-weight: 600;
  border-bottom-color: var(--color-accent);
}

.has-submenu {
  position: relative;
}

.submenu {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 220px;
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-top: 2px solid var(--color-accent);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
  padding: 8px 0;
  z-index: 200;
}

.has-submenu:hover .submenu,
.has-submenu:focus-within .submenu {
  display: block;
}

.submenu li a {
  display: block;
  padding: 8px 16px;
  font-size: 14px;
  color: var(--color-text);
}

.submenu li a:hover {
  background-color: var(--color-bg);
  color: var(--color-primary);
}

.submenu li a.is-current {
  color: var(--color-primary);
  font-weight: 600;
  background-color: var(--color-bg);
}

/* 汉堡按钮 */
.menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.menu-toggle .bar {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-primary);
  border-radius: 1px;
}

/* 页脚 */
.site-footer {
  background-color: var(--color-primary);
  color: rgba(255, 255, 255, 0.85);
  margin-top: 0;
}

.footer-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 24px 24px;
}

.footer-info {
  margin-bottom: 32px;
}

.footer-brand {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 700;
  color: #ffffff;
  display: inline-block;
  margin-bottom: 8px;
}

.footer-info p {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.7);
  max-width: 420px;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  padding: 24px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  border-bottom: 1px solid rgba(255, 255, 255, 0.15);
}

.footer-group h3 {
  font-size: 15px;
  color: #ffffff;
  margin-bottom: 12px;
  font-family: var(--font-sans);
  font-weight: 600;
}

.footer-group ul li {
  margin-bottom: 6px;
}

.footer-group ul li a {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.7);
  transition: color 0.2s ease;
}

.footer-group ul li a:hover {
  color: #ffffff;
}

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

.footer-bottom p {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.5);
  margin: 0;
}

/* 面包屑 */
.breadcrumb {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 16px 24px 0;
  font-size: 13px;
  color: var(--color-muted);
}

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

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

.breadcrumb-sep {
  margin: 0 8px;
  color: var(--color-line);
}

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

/* 页面标题区（内页统一） */
.page-header {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 40px 24px 0;
}

.page-title {
  font-size: 32px;
  line-height: 1.3;
  margin-bottom: 8px;
}

.page-title-area {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px 32px;
  border-bottom: 1px solid var(--color-line);
}

.page-title-desc,
.page-title-area p {
  font-size: 16px;
  color: var(--color-muted);
  max-width: var(--content-width);
  line-height: 1.8;
}

/* 内页主容器 */
.inner-main {
  padding-bottom: 64px;
}

.content-column,
.page-container,
.content-shell,
.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ============================================================
   Components — 通用组件
   ============================================================ */

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

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

.btn-primary:hover {
  background-color: #1e405e;
  color: #ffffff;
}

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

.btn-secondary:hover {
  background-color: var(--color-primary);
  color: #ffffff;
}

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

.btn-outline:hover {
  background-color: var(--color-primary);
  color: #ffffff;
}

.btn-back {
  display: inline-block;
  padding: 12px 28px;
  background-color: var(--color-primary);
  color: #ffffff;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius);
  border: 1px solid var(--color-primary);
}

.btn-back:hover {
  background-color: #1e405e;
  color: #ffffff;
}

/* 文本链接 */
.text-link {
  display: inline-block;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent);
  border-bottom: 1px solid var(--color-accent);
  padding-bottom: 2px;
  transition: color 0.2s ease, border-color 0.2s ease;
}

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

/* 区块标题 */
.section-header {
  margin-bottom: 32px;
}

.section-header h2 {
  margin-bottom: 8px;
}

.section-header p {
  font-size: 15px;
  color: var(--color-muted);
  max-width: 640px;
}

/* FAQ 折叠 */
.faq-item {
  border-bottom: 1px solid var(--color-line);
}

.faq-item summary {
  padding: 16px 0;
  font-size: 16px;
  font-weight: 600;
  color: var(--color-primary);
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}

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

.faq-item summary::after {
  content: "+";
  font-size: 20px;
  color: var(--color-accent);
  flex-shrink: 0;
  transition: transform 0.2s ease;
}

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

.faq-item p,
.faq-answer p {
  padding: 0 0 16px;
  font-size: 15px;
  color: var(--color-text);
  line-height: 1.8;
}

/* 相关链接 */
.related-links {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 24px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  border-top: 1px solid var(--color-line);
}

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

.related-links-item {
  font-size: 14px;
  color: var(--color-muted);
  border-bottom: 1px solid var(--color-line);
  padding-bottom: 2px;
}

.related-links-item:hover {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

/* 内容图 */
.content-media {
  margin: 32px 0;
  border-radius: var(--radius);
  overflow: hidden;
}

.content-media figcaption {
  padding: 12px 16px;
  font-size: 13px;
  color: var(--color-muted);
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-top: none;
}

.content-media-primary {
  margin: 0 0 48px;
}

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

/* 出口导航 */
.exit-nav-block,
.exit-nav-section,
.exit-nav {
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid var(--color-line);
}

.exit-nav h2,
.exit-nav-block h2,
.exit-nav-section h2 {
  font-size: 20px;
  margin-bottom: 16px;
}

.exit-nav-list,
.exit-links,
.exit-nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.exit-nav-list li a,
.exit-links a,
.exit-nav-links a,
.exit-link {
  display: inline-block;
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
  border-radius: var(--radius);
  transition: background-color 0.2s ease, color 0.2s ease;
}

.exit-nav-list li a:hover,
.exit-links a:hover,
.exit-nav-links a:hover,
.exit-link:hover {
  background-color: var(--color-primary);
  color: #ffffff;
}

/* 边界列表 */
.boundary-list {
  margin-top: 16px;
}

.boundary-list li {
  padding: 8px 0;
  font-size: 15px;
  color: var(--color-text);
  border-bottom: 1px dashed var(--color-line);
}

.boundary-list li::before {
  content: "—";
  color: var(--color-accent);
  margin-right: 8px;
}

/* 原则列表（内页通用） */
.principle-list {
  counter-reset: principle;
}

.principle-list li {
  display: flex;
  gap: 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--color-line);
}

.principle-number,
.principle-num {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 700;
  color: var(--color-accent);
  flex-shrink: 0;
  min-width: 40px;
}

.principle-content h3,
.principle-body h3 {
  font-size: 17px;
  margin-bottom: 4px;
}

.principle-content p,
.principle-body p {
  font-size: 15px;
  color: var(--color-muted);
  margin: 0;
}

/* ============================================================
   Pages — 首页
   ============================================================ */

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

.hero-container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 56px 24px 48px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.hero-text h1 {
  font-size: 34px;
  line-height: 1.35;
  margin-bottom: 16px;
}

.hero-lead {
  font-size: 16px;
  color: var(--color-muted);
  line-height: 1.8;
  margin-bottom: 24px;
}

.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.hero-tags span {
  font-size: 13px;
  color: var(--color-muted);
  border: 1px solid var(--color-line);
  border-radius: 999px;
  padding: 4px 12px;
}

.hero-media {
  position: relative;
}

.hero-figure {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--color-line);
}

.hero-figure img {
  width: 100%;
  height: 320px;
  object-fit: cover;
}

/* 服务能力预告 */
.services-preview {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: var(--space-section) 24px;
}

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

.preview-item {
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 24px;
  background-color: var(--color-white);
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
}

.preview-item:hover {
  border-color: var(--color-accent);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
}

.item-number {
  display: inline-block;
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: 8px;
}

.preview-item h3 {
  font-size: 18px;
  margin-bottom: 8px;
}

.preview-item p {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.7;
  margin-bottom: 12px;
}

/* 关注分类与服务联动 */
.category-service-layout {
  background-color: var(--color-white);
  border-top: 1px solid var(--color-line);
  border-bottom: 1px solid var(--color-line);
}

.layout-shell {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: var(--space-section) 24px;
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 48px;
}

.service-list-column h2 {
  margin-bottom: 24px;
}

.service-catalog {
  border-top: 1px solid var(--color-line);
}

.catalog-item {
  display: flex;
  gap: 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--color-line);
}

.catalog-index {
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 700;
  color: var(--color-accent);
  flex-shrink: 0;
  min-width: 32px;
}

.catalog-content h3 {
  font-size: 16px;
  margin-bottom: 4px;
}

.catalog-content p {
  font-size: 14px;
  color: var(--color-muted);
  margin: 0;
}

.category-aside {
  background-color: var(--color-bg);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 24px;
  align-self: start;
}

.aside-title {
  font-size: 18px;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-line);
}

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

.category-list li a {
  display: block;
  padding: 8px 12px;
  font-size: 14px;
  color: var(--color-text);
  border-left: 2px solid transparent;
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.category-list li a:hover {
  border-left-color: var(--color-accent);
  background-color: rgba(154, 107, 68, 0.06);
}

.aside-note {
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px solid var(--color-line);
  font-size: 13px;
  color: var(--color-muted);
}

/* 合作流程时间轴 */
.process-timeline {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: var(--space-section) 24px;
}

.timeline-list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin: 32px 0;
}

.timeline-step {
  position: relative;
  padding: 24px 20px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  background-color: var(--color-white);
  border-top: 3px solid var(--color-accent);
}

.timeline-step .step-number {
  display: inline-block;
  font-family: var(--font-serif);
  font-size: 28px;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: 8px;
}

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

.timeline-step p {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.6;
  margin: 0;
}

.timeline-link {
  text-align: center;
  margin-top: 24px;
}

/* FAQ 摘要 */
.faq-summary {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: var(--space-section) 24px;
  border-top: 1px solid var(--color-line);
}

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

/* 合作咨询引导 */
.contact-guide {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px var(--space-section);
}

.guide-box {
  background-color: var(--color-primary);
  border-radius: var(--radius);
  padding: 40px;
  text-align: center;
}

.guide-box h2 {
  color: #ffffff;
  font-size: 24px;
  margin-bottom: 12px;
}

.guide-box p {
  color: rgba(255, 255, 255, 0.85);
  font-size: 15px;
  max-width: 560px;
  margin: 0 auto 24px;
}

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

.guide-box .btn-outline {
  color: #ffffff;
  border-color: rgba(255, 255, 255, 0.7);
}

.guide-box .btn-outline:hover {
  background-color: #ffffff;
  color: var(--color-primary);
}

.guide-note {
  margin-top: 16px;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.6);
}

/* ============================================================
   Pages — 服务能力（fuwu.html）
   ============================================================ */

.service-matrix-block,
.service-mode-block,
.deliverables-block {
  padding: 48px 0;
  border-bottom: 1px solid var(--color-line);
}

.service-matrix-block h2,
.service-mode-block h2,
.deliverables-block h2 {
  margin-bottom: 24px;
}

.service-list {
  border-top: 1px solid var(--color-line);
}

.service-item {
  display: flex;
  gap: 20px;
  padding: 24px 0;
  border-bottom: 1px solid var(--color-line);
}

.service-index {
  font-family: var(--font-serif);
  font-size: 24px;
  font-weight: 700;
  color: var(--color-accent);
  flex-shrink: 0;
  min-width: 48px;
}

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

.service-audience,
.service-content,
.service-goal {
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-text);
}

.service-audience {
  color: var(--color-accent);
  font-weight: 600;
  margin-bottom: 4px;
}

.service-goal {
  color: var(--color-muted);
  font-size: 14px;
  margin-top: 8px;
}

.mode-compare {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.mode-card {
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 28px;
  background-color: var(--color-white);
  border-top: 3px solid var(--color-accent);
}

.mode-card h3 {
  font-size: 18px;
  margin-bottom: 12px;
}

.mode-suit {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent);
  margin-bottom: 8px;
}

.mode-detail {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.7;
  margin: 0;
}

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

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

.deliverable-card h3 {
  font-size: 16px;
  margin-bottom: 8px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-line);
}

.deliverable-desc {
  font-size: 14px;
  color: var(--color-text);
  line-height: 1.7;
  margin-bottom: 8px;
}

.deliverable-use {
  font-size: 13px;
  color: var(--color-muted);
  margin: 0;
}

.service-figure {
  margin: 32px 0;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--color-line);
}

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

.service-figure figcaption {
  padding: 12px 16px;
  font-size: 13px;
  color: var(--color-muted);
  background-color: var(--color-white);
}

/* ============================================================
   Pages — 应用场景（changjing.html）
   ============================================================ */

.scenario-section {
  padding: 48px 0;
  border-bottom: 1px solid var(--color-line);
}

.scenario-heading {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 16px;
}

.scenario-number {
  font-family: var(--font-serif);
  font-size: 24px;
  font-weight: 700;
  color: var(--color-accent);
  flex-shrink: 0;
}

.scenario-heading h2 {
  font-size: 22px;
}

.scenario-intro {
  font-size: 15px;
  color: var(--color-muted);
  margin-bottom: 24px;
  max-width: var(--content-width);
}

.scenario-detail {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-bottom: 24px;
}

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

.scenario-item h3 {
  font-size: 16px;
  margin-bottom: 8px;
}

.scenario-item p {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.7;
  margin: 0;
}

.scenario-cta {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.scenario-cta a {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent);
  border-bottom: 1px solid var(--color-accent);
  padding-bottom: 2px;
}

.scenario-cta a:hover {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

/* 对照表 */
.mapping-section {
  padding: 48px 0;
  border-bottom: 1px solid var(--color-line);
}

.mapping-section h2 {
  margin-bottom: 8px;
}

.mapping-section > p {
  font-size: 15px;
  color: var(--color-muted);
  margin-bottom: 24px;
}

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

.mapping-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  min-width: 640px;
}

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

.mapping-table th {
  background-color: var(--color-primary);
  color: #ffffff;
  font-weight: 600;
  font-size: 14px;
}

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

.mapping-table tbody tr:nth-child(even) {
  background-color: rgba(217, 212, 203, 0.15);
}

.scenario-figure {
  margin: 32px 0;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--color-line);
}

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

.scenario-figure figcaption {
  padding: 12px 16px;
  font-size: 13px;
  color: var(--color-muted);
  background-color: var(--color-white);
}

/* 边界说明 */
.boundary-section {
  padding: 48px 0;
}

.boundary-section h2 {
  margin-bottom: 12px;
}

.boundary-section > p {
  font-size: 15px;
  color: var(--color-muted);
  margin-bottom: 16px;
}

/* ============================================================
   Pages — 项目交付（xiangmu.html）
   ============================================================ */

.project-types-section,
.delivery-standard-section,
.work-principles-section {
  padding: 48px 0;
  border-bottom: 1px solid var(--color-line);
}

.project-types-section h2,
.delivery-standard-section h2,
.work-principles-section h2 {
  margin-bottom: 24px;
}

.project-type-list {
  border-top: 1px solid var(--color-line);
}

.project-type-item {
  display: flex;
  gap: 20px;
  padding: 24px 0;
  border-bottom: 1px solid var(--color-line);
}

.project-number {
  font-family: var(--font-serif);
  font-size: 24px;
  font-weight: 700;
  color: var(--color-accent);
  flex-shrink: 0;
  min-width: 48px;
}

.project-content h3 {
  font-size: 18px;
  margin-bottom: 8px;
}

.project-target {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent);
  margin-bottom: 6px;
}

.project-desc {
  font-size: 15px;
  color: var(--color-text);
  line-height: 1.7;
  margin: 0;
}

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

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

.delivery-standard-card h3 {
  font-size: 17px;
  margin-bottom: 12px;
}

.delivery-standard-card ul li {
  position: relative;
  padding: 6px 0 6px 16px;
  font-size: 14px;
  color: var(--color-text);
  line-height: 1.6;
}

.delivery-standard-card ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 14px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--color-accent);
}

.report-visual-section {
  padding: 32px 0;
}

.report-figure {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--color-line);
}

.report-figure img {
  width: 100%;
  height: 300px;
  object-fit: cover;
}

.report-figure figcaption {
  padding: 12px 16px;
  font-size: 13px;
  color: var(--color-muted);
  background-color: var(--color-white);
}

/* 工作原则 */
.work-principles-section {
  border-bottom: none;
}

.work-principles-section .principle-list {
  border-top: 1px solid var(--color-line);
}

/* ============================================================
   Pages — 合作流程（hezuo.html）
   ============================================================ */

.page-title-block {
  padding: 32px 0;
  border-bottom: 1px solid var(--color-line);
}

.page-title-block p {
  font-size: 16px;
  color: var(--color-muted);
  max-width: var(--content-width);
}

.timeline-section {
  padding: 48px 0;
  border-bottom: 1px solid var(--color-line);
}

.timeline-section h2 {
  margin-bottom: 8px;
}

.section-intro {
  font-size: 15px;
  color: var(--color-muted);
  margin-bottom: 32px;
}

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

.timeline-steps::before {
  content: "";
  position: absolute;
  top: 24px;
  left: 12.5%;
  right: 12.5%;
  height: 2px;
  background-color: var(--color-line);
}

.timeline-step {
  text-align: center;
  position: relative;
  z-index: 1;
}

.timeline-step .step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background-color: var(--color-primary);
  color: #ffffff;
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 12px;
  border: 3px solid var(--color-white);
  box-shadow: 0 0 0 2px var(--color-accent);
}

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

.timeline-step .step-content p {
  font-size: 13px;
  color: var(--color-muted);
  line-height: 1.6;
  margin: 0;
}

.steps-detail-section {
  padding: 48px 0;
  border-bottom: 1px solid var(--color-line);
}

.steps-detail-section h2 {
  margin-bottom: 8px;
}

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

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

.step-card h3 {
  font-size: 17px;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-line);
}

.step-list li {
  position: relative;
  padding: 6px 0 6px 16px;
  font-size: 14px;
  color: var(--color-text);
  line-height: 1.7;
}

.step-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 14px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--color-accent);
}

/* 合作前置说明 */
.precondition-section {
  padding: 48px 0;
}

.precondition-section h2 {
  margin-bottom: 8px;
}

.precondition-section > p {
  font-size: 15px;
  color: var(--color-muted);
  margin-bottom: 24px;
}

.precondition-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 32px;
}

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

.precondition-item h3 {
  font-size: 15px;
  margin-bottom: 8px;
  color: var(--color-accent);
}

.precondition-item p {
  font-size: 14px;
  color: var(--color-text);
  line-height: 1.7;
  margin: 0;
}

/* ============================================================
   Pages — 常见问题（changjian.html）
   ============================================================ */

.title-area-inner {
  max-width: var(--content-width);
}

.title-desc {
  font-size: 16px;
  color: var(--color-muted);
}

.faq-section {
  background-color: var(--color-white);
  border-bottom: 1px solid var(--color-line);
}

.faq-section-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 24px;
}

.faq-section-inner h2 {
  font-size: 22px;
  margin-bottom: 24px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-line);
}

.faq-section-inner .faq-list {
  max-width: var(--content-width);
}

/* 帮助说明 */
.help-note {
  background-color: var(--color-bg);
}

.help-note-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 24px;
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 40px;
  align-items: center;
}

.help-figure {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--color-line);
}

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

.help-content h2 {
  font-size: 22px;
  margin-bottom: 12px;
}

.help-content p {
  font-size: 15px;
  color: var(--color-muted);
  line-height: 1.8;
  margin-bottom: 12px;
}

.help-content a {
  display: inline-block;
  margin: 4px 12px 4px 0;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent);
  border-bottom: 1px solid var(--color-accent);
  padding-bottom: 2px;
}

.help-content a:hover {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

/* ============================================================
   Pages — 关于我们（guanyu.html）
   ============================================================ */

.page-heading {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px 32px;
  border-bottom: 1px solid var(--color-line);
}

.page-heading-desc {
  font-size: 16px;
  color: var(--color-muted);
  max-width: var(--content-width);
}

.about-intro {
  padding: 48px 0;
  border-bottom: 1px solid var(--color-line);
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 40px;
  align-items: center;
}

.about-intro-text h2 {
  font-size: 22px;
  margin-bottom: 16px;
}

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

.about-intro-media {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--color-line);
}

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

.about-intro-media figcaption {
  padding: 12px 16px;
  font-size: 13px;
  color: var(--color-muted);
  background-color: var(--color-white);
}

.principles-section,
.team-section,
.compliance-section {
  padding: 48px 0;
  border-bottom: 1px solid var(--color-line);
}

.principles-section h2,
.team-section h2,
.compliance-section h2 {
  margin-bottom: 16px;
}

.principles-section .principle-list {
  border-top: 1px solid var(--color-line);
}

.section-lead {
  font-size: 15px;
  color: var(--color-muted);
  margin-bottom: 24px;
}

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

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

.team-card h3 {
  font-size: 16px;
  margin-bottom: 8px;
}

.team-card p {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.7;
  margin: 0;
}

.compliance-section {
  border-bottom: none;
}

.compliance-section > p {
  font-size: 15px;
  color: var(--color-text);
  margin-bottom: 16px;
}

/* 站内导航 */
.exit-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

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

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

.error-section {
  text-align: center;
  padding: 64px 24px;
  max-width: 560px;
}

.error-code {
  font-family: var(--font-serif);
  font-size: 72px;
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1.2;
  margin-bottom: 8px;
}

.error-section h1 {
  font-size: 24px;
  margin-bottom: 12px;
}

.error-desc {
  font-size: 15px;
  color: var(--color-muted);
  margin-bottom: 24px;
}

.error-help {
  margin-top: 24px;
  font-size: 14px;
  color: var(--color-muted);
}

.error-help a {
  display: inline-block;
  margin: 0 8px;
  font-weight: 600;
  color: var(--color-accent);
  border-bottom: 1px solid var(--color-accent);
  padding-bottom: 2px;
}

.error-help a:hover {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

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

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

  .layout-shell {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .category-aside {
    order: 2;
  }

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

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

  .timeline-steps::before {
    display: none;
  }

  .help-note-inner {
    grid-template-columns: 1fr;
    gap: 24px;
  }

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

/* 手机端 */
@media (max-width: 768px) {
  :root {
    --space-section: var(--space-mobile);
  }

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

  .brand-name {
    font-size: 18px;
  }

  .brand-slogan {
    font-size: 11px;
  }

  .menu-toggle {
    display: flex;
  }

  .primary-nav {
    position: static;
  }

  .nav-list {
    display: none;
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    background-color: var(--color-white);
    border-bottom: 1px solid var(--color-line);
    flex-direction: column;
    align-items: stretch;
    padding: 8px 16px;
    gap: 0;
    z-index: 300;
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.08);
  }

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

  .nav-item {
    width: 100%;
  }

  .nav-link {
    padding: 12px 8px;
    border-bottom: 1px solid var(--color-line);
    border-left: 2px solid transparent;
  }

  .nav-link.is-current {
    border-left-color: var(--color-accent);
    border-bottom-color: var(--color-line);
  }

  .has-submenu {
    position: relative;
  }

  .submenu {
    display: none;
    position: static;
    box-shadow: none;
    border: none;
    padding: 0 0 0 16px;
    background-color: var(--color-bg);
  }

  .has-submenu:hover .submenu,
  .has-submenu:focus-within .submenu {
    display: block;
  }

  .submenu li a {
    padding: 10px 8px;
    font-size: 14px;
  }

  /* 面包屑 */
  .breadcrumb {
    padding: 12px 16px 0;
  }

  .page-header {
    padding: 24px 16px 0;
  }

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

  .page-title-area {
    padding: 0 16px 24px;
  }

  .content-column,
  .page-container,
  .content-shell,
  .container {
    padding: 0 16px;
  }

  /* 首页 */
  .hero-container {
    padding: 32px 16px;
  }

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

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

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

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

  .services-preview,
  .process-timeline,
  .faq-summary,
  .contact-guide {
    padding-left: 16px;
    padding-right: 16px;
  }

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

  .layout-shell {
    padding: var(--space-section) 16px;
  }

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

  .guide-box {
    padding: 32px 20px;
  }

  .guide-links {
    flex-direction: column;
    align-items: stretch;
  }

  .guide-links .btn {
    width: 100%;
  }

  /* 内页通用 */
  .inner-main {
    padding-bottom: 32px;
  }

  .service-matrix-block,
  .service-mode-block,
  .deliverables-block,
  .scenario-section,
  .mapping-section,
  .boundary-section,
  .project-types-section,
  .delivery-standard-section,
  .work-principles-section,
  .timeline-section,
  .steps-detail-section,
  .precondition-section,
  .principles-section,
  .team-section,
  .compliance-section {
    padding: 32px 0;
  }

  .service-item,
  .project-type-item {
    flex-direction: column;
    gap: 8px;
    padding: 20px 0;
  }

  .service-index,
  .project-number {
    font-size: 20px;
    min-width: auto;
  }

  .mode-compare,
  .deliverables-grid,
  .delivery-standard-grid,
  .scenario-detail,
  .steps-detail-grid,
  .precondition-list,
  .team-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .timeline-steps {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .timeline-step {
    display: flex;
    gap: 16px;
    text-align: left;
    align-items: flex-start;
  }

  .timeline-step .step-number {
    margin-bottom: 0;
    flex-shrink: 0;
  }

  .timeline-step .step-content {
    flex: 1;
  }

  .precondition-list {
    margin-bottom: 24px;
  }

  .related-links {
    padding: 16px;
    gap: 8px;
  }

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

  .footer-links {
    grid-template-columns: 1fr 1fr;
    gap: 24px;
  }

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

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

  .brand-slogan {
    display: none;
  }

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

  .help-note-inner {
    padding: 32px 16px;
  }

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

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

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

  .service-figure img,
  .scenario-figure img {
    height: 220px;
  }

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