/* ============================================================
   51吃瓜网视频 - 全站样式表
   站点：ahwgsw.cn
   视觉方向：简洁电商目录风 · 深灰蓝主色 · 米白背景 · 琥珀强调
   ============================================================ */

/* ============================================================
   1. Base - 基础变量、重置、全局骨架
   ============================================================ */
:root {
  --color-primary: #1E3A5F;
  --color-primary-dark: #162C49;
  --color-primary-light: #2A4E7A;
  --color-accent: #D9772B;
  --color-accent-dark: #C06620;
  --color-bg: #F5F1E8;
  --color-bg-card: #FFFFFF;
  --color-text: #21313F;
  --color-text-secondary: #5B6B7A;
  --color-border: #E2DDD2;
  --color-white: #FFFFFF;
  --color-footer-bg: #162C49;
  --color-footer-text: #A8B6C4;

  --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-num: "Inter", -apple-system, BlinkMacSystemFont, "PingFang SC", sans-serif;

  --container-width: 1200px;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;

  --shadow-card: 0 1px 3px rgba(30, 58, 95, 0.08);
  --shadow-hover: 0 6px 16px rgba(30, 58, 95, 0.12);
  --shadow-cta: 0 4px 12px rgba(217, 119, 43, 0.25);

  --header-height: 68px;
  --transition-base: 0.2s ease;
}

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

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

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

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

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-base);
}

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

ul,
ol {
  list-style: none;
}

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

h1 {
  font-size: 40px;
}

h2 {
  font-size: 32px;
}

h3 {
  font-size: 24px;
}

p {
  line-height: 1.7;
}

figure {
  margin: 0;
}

/* 数字与英文 */
.num,
.node-number,
.step-number,
.step-num,
.error-code,
.brand-tag {
  font-family: var(--font-num);
}

/* 全站统一容器宽度 */
.header-inner,
.footer-inner,
.hero-layout,
.services-section .section-header,
.services-grid,
.cases-section .section-header,
.cases-grid,
.process-section .section-header,
.process-timeline,
.value-layout,
.faq-section .section-header,
.faq-grid,
.cta-banner,
.layout-shell,
.page-title-inner,
.case-intro-inner,
.related-links-inner,
.process-steps,
.prep-note,
.prep-grid,
.faq-layout,
.more-links,
.page-layout,
.chapter-layout,
.next-links .container,
.error-content {
  width: 100%;
  max-width: var(--container-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

/* 通用 section 间距 */
section {
  padding: 72px 0;
}

/* ============================================================
   2. Layout - 页头、导航、页脚、面包屑、页面标题区
   ============================================================ */

/* ---------- 页头 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-white);
  border-bottom: 1px solid var(--color-border);
  height: var(--header-height);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.brand-logo {
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-shrink: 0;
}

.brand-name {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 0.02em;
}

.brand-tag {
  font-size: 12px;
  font-weight: 400;
  color: var(--color-text-secondary);
  border-left: 1px solid var(--color-border);
  padding-left: 10px;
  line-height: 1.4;
}

/* ---------- 主导航 ---------- */
.main-nav.site-nav {
  display: flex;
  align-items: center;
}

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

.nav-link {
  display: inline-block;
  padding: 8px 16px;
  font-size: 15px;
  font-weight: 400;
  color: var(--color-text);
  border-radius: var(--radius-sm);
  line-height: 1.5;
  min-height: 44px;
  display: flex;
  align-items: center;
}

.nav-link:hover {
  color: var(--color-accent);
  background-color: rgba(217, 119, 43, 0.06);
}

.nav-link.is-current {
  color: var(--color-accent);
  font-weight: 700;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  background: transparent;
  border: 0;
  cursor: pointer;
  padding: 0;
}

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

/* ---------- 页脚 ---------- */
.site-footer {
  background-color: var(--color-footer-bg);
  color: var(--color-footer-text);
  margin-top: 0;
}

.footer-inner {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 48px;
  padding-top: 64px;
  padding-bottom: 48px;
}

.footer-col h3 {
  font-size: 16px;
  color: var(--color-white);
  margin-bottom: 20px;
  font-weight: 700;
}

.footer-brand .footer-slogan {
  font-size: 16px;
  color: var(--color-white);
  font-weight: 700;
  margin-bottom: 12px;
  line-height: 1.5;
}

.footer-brand p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-footer-text);
  max-width: 300px;
}

.footer-links li {
  margin-bottom: 10px;
}

.footer-links a {
  color: var(--color-footer-text);
  font-size: 14px;
  line-height: 1.6;
  display: inline-block;
  padding: 2px 0;
}

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

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: 20px 0;
}

.footer-bottom p {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
  font-size: 13px;
  color: rgba(168, 182, 196, 0.7);
  text-align: center;
}

/* ---------- 面包屑 ---------- */
.breadcrumb {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 20px 24px 0;
  font-size: 14px;
  color: var(--color-text-secondary);
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
}

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

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

.breadcrumb-sep {
  color: var(--color-border);
  font-size: 12px;
}

.breadcrumb-current {
  color: var(--color-text);
  font-weight: 400;
}

/* ---------- 页面标题区 ---------- */
.page-header {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 32px 24px 0;
}

.page-title {
  font-size: 40px;
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.2;
}

.page-title-area {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 16px 24px 40px;
}

.page-intro,
.page-description,
.page-desc {
  font-size: 17px;
  line-height: 1.7;
  color: var(--color-text-secondary);
  max-width: 760px;
}

.page-title-inner {
  padding-left: 0;
  padding-right: 0;
}

/* ---------- 内页主容器 ---------- */
.inner-main {
  background-color: var(--color-bg);
  min-height: 60vh;
  padding-bottom: 72px;
}

/* ============================================================
   3. Components - 按钮、卡片、FAQ、CTA、相关推荐、时间轴
   ============================================================ */

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 10px 28px;
  font-size: 16px;
  font-weight: 700;
  border-radius: var(--radius-md);
  border: 2px solid transparent;
  cursor: pointer;
  transition: background-color var(--transition-base), color var(--transition-base), border-color var(--transition-base), transform var(--transition-base);
  line-height: 1.4;
}

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

.btn-primary:hover {
  background-color: var(--color-accent-dark);
  border-color: var(--color-accent-dark);
  color: var(--color-white);
  transform: translateY(-1px);
}

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

.btn-secondary:hover {
  background-color: var(--color-primary);
  color: var(--color-white);
  transform: translateY(-1px);
}

/* ---------- 卡片通用 ---------- */
.service-card,
.case-card,
.aside-card,
.prep-card,
.step-card {
  background-color: var(--color-bg-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  border: 1px solid var(--color-border);
}

/* ---------- 服务卡片（首页） ---------- */
.service-card {
  padding: 32px 28px;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.service-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.service-card h3 {
  font-size: 20px;
  margin-bottom: 12px;
  color: var(--color-primary);
}

.service-card p {
  font-size: 15px;
  color: var(--color-text-secondary);
  flex-grow: 1;
  margin-bottom: 20px;
}

.card-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 15px;
  font-weight: 700;
  color: var(--color-accent);
}

.card-link::after {
  content: "→";
  font-size: 16px;
  transition: transform var(--transition-base);
}

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

/* ---------- 案例卡片（首页） ---------- */
.case-card {
  display: block;
  overflow: hidden;
  border: 1px solid var(--color-border);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.case-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.case-card figure {
  position: relative;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background-color: var(--color-primary-light);
}

.case-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.case-card:hover img {
  transform: scale(1.04);
}

.case-card figcaption {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 40px 16px 12px;
  background: linear-gradient(to top, rgba(22, 44, 73, 0.85), transparent);
  color: var(--color-white);
  font-size: 14px;
  font-weight: 700;
  line-height: 1.5;
}

.case-tag {
  display: inline-block;
  padding: 8px 16px;
  font-size: 13px;
  font-weight: 700;
  color: var(--color-primary);
  background-color: var(--color-bg);
  border-top: 1px solid var(--color-border);
}

/* ---------- 区块标题 ---------- */
.section-header {
  text-align: left;
  margin-bottom: 48px;
}

.section-header h2 {
  font-size: 32px;
  color: var(--color-text);
  margin-bottom: 12px;
}

.section-header p {
  font-size: 16px;
  color: var(--color-text-secondary);
  max-width: 640px;
  line-height: 1.7;
}

.section-footer-link {
  margin-top: 40px;
  text-align: center;
}

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 16px;
  font-weight: 700;
  color: var(--color-accent);
  padding: 8px 0;
}

.text-link::after {
  content: "→";
  transition: transform var(--transition-base);
}

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

/* ---------- 流程节点（首页横向） ---------- */
.process-timeline {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 24px;
  position: relative;
}

.process-node {
  position: relative;
  padding: 24px 16px;
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  text-align: left;
  transition: box-shadow var(--transition-base);
}

.process-node:hover {
  box-shadow: var(--shadow-hover);
}

.node-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background-color: var(--color-primary);
  color: var(--color-white);
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 16px;
}

.process-node h3 {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 8px;
}

.process-node p {
  font-size: 14px;
  line-height: 1.6;
  color: var(--color-text-secondary);
}

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

.faq-item summary {
  padding: 18px 20px;
  font-size: 16px;
  font-weight: 700;
  color: var(--color-text);
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  line-height: 1.5;
  min-height: 44px;
  user-select: none;
}

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

.faq-item summary::after {
  content: "+";
  font-size: 22px;
  font-weight: 400;
  color: var(--color-accent);
  flex-shrink: 0;
  transition: transform var(--transition-base);
}

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

.faq-item[open] summary {
  border-bottom: 1px solid var(--color-border);
}

.faq-item p {
  padding: 16px 20px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-text-secondary);
}

/* ---------- CTA 引导条 ---------- */
.cta-banner {
  background-color: var(--color-primary);
  border-radius: var(--radius-lg);
  padding: 48px 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}

.cta-copy h2 {
  color: var(--color-white);
  font-size: 28px;
  margin-bottom: 8px;
}

.cta-copy p {
  color: rgba(255, 255, 255, 0.85);
  font-size: 16px;
}

.cta-banner .btn-primary {
  flex-shrink: 0;
}

/* ---------- 相关推荐（首页底部） ---------- */
.related-links {
  background-color: var(--color-bg-card);
  border-top: 1px solid var(--color-border);
  padding: 24px 0;
}

.related-links-label {
  display: block;
  font-size: 14px;
  font-weight: 700;
  color: var(--color-text-secondary);
  text-align: center;
  margin-bottom: 12px;
}

.related-links-item {
  display: inline-block;
  margin: 6px 10px;
  font-size: 15px;
  color: var(--color-primary);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  background-color: var(--color-bg);
}

.related-links-item:hover {
  color: var(--color-accent);
  background-color: rgba(217, 119, 43, 0.08);
}

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

/* ---------- Hero ---------- */
.hero-section {
  background-color: var(--color-bg);
  padding: 64px 0;
}

.hero-layout {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 56px;
  align-items: center;
}

.hero-copy h1 {
  font-size: 42px;
  line-height: 1.25;
  color: var(--color-text);
  margin-bottom: 20px;
  max-width: 560px;
}

.hero-lead {
  font-size: 18px;
  line-height: 1.7;
  color: var(--color-text-secondary);
  margin-bottom: 32px;
  max-width: 520px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 32px;
}

.hero-points {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
}

.hero-points span {
  font-size: 14px;
  color: var(--color-text-secondary);
  position: relative;
  padding-left: 18px;
}

.hero-points span::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--color-accent);
}

.hero-media {
  aspect-ratio: 4 / 3;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-hover);
  background-color: var(--color-primary-light);
}

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

/* ---------- 服务项目速览 ---------- */
.services-section {
  background-color: var(--color-bg-card);
}

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

/* 4 个服务卡片：第 4 个跨 3 列，单独一行，避免孤项 */
.services-grid .service-card:nth-child(4) {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 24px;
  align-items: center;
  padding: 24px 32px;
}

.services-grid .service-card:nth-child(4) h3 {
  margin-bottom: 0;
  white-space: nowrap;
}

.services-grid .service-card:nth-child(4) p {
  margin-bottom: 0;
}

.services-grid .service-card:nth-child(4) .card-link {
  white-space: nowrap;
}

/* ---------- 案例缩略图墙 ---------- */
.cases-section {
  background-color: var(--color-bg);
}

.cases-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

/* ---------- 制作流程横向时间轴 ---------- */
.process-section {
  background-color: var(--color-bg-card);
}

/* ---------- 为什么选择视频服务 ---------- */
.value-section {
  background-color: var(--color-bg);
}

.value-layout {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 56px;
  align-items: start;
}

.value-heading h2 {
  font-size: 32px;
  color: var(--color-text);
  margin-bottom: 16px;
}

.value-heading p {
  font-size: 16px;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.value-points {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.value-item {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px;
}

.value-item h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.value-item p {
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* ---------- 首页 FAQ ---------- */
.faq-section {
  background-color: var(--color-bg-card);
}

.faq-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0 24px;
}

/* ---------- 首页 CTA ---------- */
.contact-cta-section {
  background-color: var(--color-bg);
  padding: 72px 0;
}

.cta-banner .cta-copy h2 {
  font-size: 28px;
}

/* ============================================================
   5. Pages - 内页
   ============================================================ */

/* ---------- 服务页（service.html） ---------- */
.layout-shell.service-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 48px;
  align-items: start;
  padding-top: 8px;
  padding-bottom: 0;
}

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

.service-item {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 32px;
  align-items: start;
  padding: 40px 0;
  border-bottom: 1px solid var(--color-border);
}

.service-item:first-of-type {
  padding-top: 0;
}

.service-item:last-of-type {
  border-bottom: 0;
}

.service-item-media figure {
  aspect-ratio: 4 / 3;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background-color: var(--color-primary-light);
  box-shadow: var(--shadow-card);
}

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

.service-item-body h2 {
  font-size: 26px;
  color: var(--color-text);
  margin-bottom: 20px;
}

.service-scope h3 {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 6px;
  margin-top: 18px;
}

.service-scope h3:first-child {
  margin-top: 0;
}

.service-scope p {
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 12px;
}

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

.service-scope ul li {
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 4px;
}

/* 服务页 CTA */
.service-item.contact-cta {
  display: block;
  border: 0;
  padding: 40px 0 0;
}

.cta-content h2 {
  font-size: 24px;
  color: var(--color-text);
  margin-bottom: 8px;
}

.cta-content p {
  font-size: 15px;
  color: var(--color-text-secondary);
  margin-bottom: 20px;
}

.cta-action {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

/* 侧边栏 */
.aside-nav {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  position: sticky;
  top: calc(var(--header-height) + 24px);
}

.aside-nav h2 {
  font-size: 18px;
  color: var(--color-text);
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
}

.aside-nav ul li {
  margin-bottom: 4px;
}

.aside-nav ul a {
  display: block;
  padding: 10px 12px;
  font-size: 15px;
  color: var(--color-text-secondary);
  border-radius: var(--radius-sm);
  border-left: 3px solid transparent;
  transition: color var(--transition-base), border-color var(--transition-base), background-color var(--transition-base);
}

.aside-nav ul a:hover {
  color: var(--color-accent);
  border-left-color: var(--color-accent);
  background-color: rgba(217, 119, 43, 0.04);
}

.aside-note {
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid var(--color-border);
}

.aside-note h3 {
  font-size: 15px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 8px;
}

.aside-note p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* ---------- 案例页（case.html） ---------- */
.section-block {
  padding: 56px 0;
  background-color: var(--color-bg-card);
}

.section-block:nth-of-type(even) {
  background-color: var(--color-bg);
}

.case-intro-inner {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
}

.case-intro-text h2 {
  font-size: 28px;
  color: var(--color-text);
  margin-bottom: 16px;
}

.case-intro-text p {
  font-size: 16px;
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin-bottom: 16px;
}

.case-intro-media figure {
  aspect-ratio: 4 / 3;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background-color: var(--color-primary-light);
  box-shadow: var(--shadow-card);
}

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

.case-detail-item {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 48px;
  align-items: center;
}

.case-detail-reverse .case-detail-media {
  order: 2;
}

.case-detail-reverse .case-detail-content {
  order: 1;
}

.case-detail-media figure {
  aspect-ratio: 4 / 3;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background-color: var(--color-primary-light);
  box-shadow: var(--shadow-card);
}

.case-detail-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.case-detail-content h2 {
  font-size: 26px;
  color: var(--color-text);
  margin-bottom: 12px;
}

.case-tag {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  color: var(--color-accent);
  background-color: rgba(217, 119, 43, 0.08);
  padding: 4px 12px;
  border-radius: var(--radius-sm);
  margin-bottom: 16px;
}

.case-detail-content p {
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin-bottom: 12px;
}

/* 相关推荐（案例页） */
.related-links-inner h2 {
  font-size: 24px;
  color: var(--color-text);
  margin-bottom: 24px;
}

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

.related-link-list li {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
}

.related-link-list a {
  display: block;
  font-size: 16px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 4px;
}

.related-link-list a:hover {
  color: var(--color-accent);
}

.related-link-list span {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* ---------- 流程页（process.html） ---------- */
.process-steps {
  padding-top: 16px;
  padding-bottom: 0;
}

.step-item {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 32px;
  padding: 32px 0;
  border-bottom: 1px solid var(--color-border);
  position: relative;
}

.step-item:last-child {
  border-bottom: 0;
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background-color: var(--color-primary);
  color: var(--color-white);
  font-size: 20px;
  font-weight: 700;
}

.step-content h2 {
  font-size: 22px;
  color: var(--color-text);
  margin-bottom: 8px;
}

.step-content p {
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  max-width: 680px;
}

/* 企业配合事项 */
.prep-note {
  padding-top: 56px;
  padding-bottom: 0;
}

.prep-note h2 {
  font-size: 28px;
  color: var(--color-text);
  margin-bottom: 32px;
}

.prep-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-bottom: 48px;
}

.prep-card {
  padding: 28px 24px;
}

.prep-card h3 {
  font-size: 17px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.prep-card p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.process-media figure {
  aspect-ratio: 16 / 7;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background-color: var(--color-primary-light);
}

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

.process-media figcaption {
  text-align: center;
  font-size: 13px;
  color: var(--color-text-secondary);
  padding: 12px 0 0;
}

/* 流程页相关推荐 */
.related-links .related-list {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.related-links h2 {
  font-size: 20px;
  color: var(--color-text);
  margin-bottom: 20px;
  text-align: center;
}

.related-list li {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
}

.related-list a {
  display: block;
  font-size: 16px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 4px;
}

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

.related-list span {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* ---------- FAQ 页（faq.html） ---------- */
.faq-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0 32px;
  align-items: start;
  padding-bottom: 0;
}

.faq-column {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.more-links {
  padding-top: 48px;
  padding-bottom: 0;
}

.more-links h2 {
  font-size: 24px;
  color: var(--color-text);
  margin-bottom: 8px;
}

.more-links > p {
  font-size: 15px;
  color: var(--color-text-secondary);
  margin-bottom: 24px;
  max-width: 600px;
}

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

.more-links-list a {
  display: inline-block;
  padding: 10px 20px;
  font-size: 15px;
  font-weight: 700;
  color: var(--color-primary);
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.more-links-list a:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
}

.more-links-list span {
  display: block;
  font-size: 13px;
  font-weight: 400;
  color: var(--color-text-secondary);
  margin-top: 2px;
}

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

.faq-media figure {
  aspect-ratio: 16 / 6;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background-color: var(--color-primary-light);
}

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

.faq-media figcaption {
  text-align: center;
  font-size: 13px;
  color: var(--color-text-secondary);
  padding: 12px 0 0;
}

/* ---------- 咨询页（contact.html） ---------- */
.page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 48px;
  align-items: start;
  padding-top: 8px;
  padding-bottom: 0;
}

.consult-content {
  min-width: 0;
}

.consult-intro h2 {
  font-size: 24px;
  color: var(--color-text);
  margin-bottom: 12px;
}

.consult-intro p {
  font-size: 15px;
  color: var(--color-text-secondary);
  margin-bottom: 16px;
  max-width: 640px;
}

.prep-list {
  margin-bottom: 32px;
}

.prep-list li {
  position: relative;
  padding: 8px 0 8px 24px;
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.prep-list li::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 18px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--color-accent);
}

.prep-list strong {
  color: var(--color-text);
  font-weight: 700;
  margin-right: 4px;
}

.consult-steps h2 {
  font-size: 24px;
  color: var(--color-text);
  margin-bottom: 8px;
}

.consult-steps > p {
  font-size: 15px;
  color: var(--color-text-secondary);
  margin-bottom: 24px;
}

.step-card {
  padding: 28px;
  margin-bottom: 16px;
  display: flex;
  gap: 20px;
  align-items: flex-start;
}

.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background-color: var(--color-primary);
  color: var(--color-white);
  font-size: 18px;
  font-weight: 700;
  flex-shrink: 0;
}

.step-card h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 6px;
}

.step-card p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.work-scene {
  margin-top: 32px;
}

.scene-figure figure {
  aspect-ratio: 16 / 7;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background-color: var(--color-primary-light);
}

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

.scene-figure figcaption {
  text-align: center;
  font-size: 13px;
  color: var(--color-text-secondary);
  padding: 12px 0 0;
}

/* 咨询页侧栏 */
.consult-aside {
  display: flex;
  flex-direction: column;
  gap: 24px;
  position: sticky;
  top: calc(var(--header-height) + 24px);
}

.aside-card {
  padding: 28px 24px;
}

.aside-card h2 {
  font-size: 18px;
  color: var(--color-text);
  margin-bottom: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
}

.aside-card p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 16px;
}

.channel-list li {
  padding: 8px 0;
  border-bottom: 1px solid var(--color-border);
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.channel-list li:last-child {
  border-bottom: 0;
}

.channel-list strong {
  display: block;
  font-size: 15px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 2px;
}

/* 咨询页底部 CTA */
.cta-banner .cta-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  width: 100%;
}

.cta-inner h2 {
  color: var(--color-white);
  font-size: 24px;
  margin-bottom: 6px;
}

.cta-inner p {
  color: rgba(255, 255, 255, 0.85);
  font-size: 15px;
}

.cta-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background-color: var(--color-accent);
  color: var(--color-white);
  font-size: 16px;
  font-weight: 700;
  padding: 12px 28px;
  border-radius: var(--radius-md);
  flex-shrink: 0;
  transition: background-color var(--transition-base);
}

.cta-link:hover {
  background-color: var(--color-accent-dark);
  color: var(--color-white);
}

.cta-link::after {
  content: "→";
  font-size: 18px;
}

/* ---------- 指南页（guide.html） ---------- */
.guide-chapter {
  background-color: var(--color-bg-card);
}

.guide-chapter:nth-of-type(even) {
  background-color: var(--color-bg);
}

.chapter-layout {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 56px;
  align-items: center;
}

.chapter-reverse .chapter-media {
  order: 2;
}

.chapter-reverse .chapter-text {
  order: 1;
}

.chapter-text h2 {
  font-size: 28px;
  color: var(--color-text);
  margin-bottom: 20px;
}

.chapter-text p {
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin-bottom: 16px;
}

.chapter-media figure {
  aspect-ratio: 4 / 3;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background-color: var(--color-primary-light);
  box-shadow: var(--shadow-card);
}

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

.chapter-media figcaption {
  text-align: center;
  font-size: 13px;
  color: var(--color-text-secondary);
  padding: 12px 0 0;
}

/* 指南页下一步 */
.next-links {
  background-color: var(--color-bg-card);
  border-top: 1px solid var(--color-border);
}

.next-links .container h2 {
  font-size: 24px;
  color: var(--color-text);
  margin-bottom: 24px;
  text-align: center;
}

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

.next-link-list a {
  display: block;
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px 20px;
  transition: box-shadow var(--transition-base), border-color var(--transition-base);
}

.next-link-list a:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-hover);
}

.link-title {
  display: block;
  font-size: 16px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 6px;
}

.next-link-list a:hover .link-title {
  color: var(--color-accent);
}

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

/* ---------- 404 页 ---------- */
.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  background-color: var(--color-bg);
}

.error-content {
  text-align: center;
  padding: 72px 24px;
}

.error-code {
  font-size: 96px;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: 16px;
}

.error-content h1 {
  font-size: 32px;
  color: var(--color-text);
  margin-bottom: 12px;
}

.error-desc {
  font-size: 16px;
  color: var(--color-text-secondary);
  margin-bottom: 32px;
  max-width: 480px;
  margin-left: auto;
  margin-right: auto;
}

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

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

/* ---------- 1024px 以下 ---------- */
@media (max-width: 1024px) {
  h1 {
    font-size: 34px;
  }

  h2 {
    font-size: 28px;
  }

  .page-title {
    font-size: 34px;
  }

  .hero-copy h1 {
    font-size: 36px;
  }

  .hero-layout {
    gap: 40px;
  }

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

  .services-grid .service-card:nth-child(4) {
    grid-column: 1 / -1;
    display: block;
  }

  .services-grid .service-card:nth-child(4) h3 {
    margin-bottom: 12px;
  }

  .services-grid .service-card:nth-child(4) p {
    margin-bottom: 16px;
  }

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

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

  .layout-shell.service-layout {
    grid-template-columns: minmax(0, 1fr) 260px;
    gap: 32px;
  }

  .service-item {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .service-item-media figure {
    aspect-ratio: 16 / 9;
  }

  .page-layout {
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: 32px;
  }

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

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

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

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

/* ---------- 768px 以下（移动端） ---------- */
@media (max-width: 768px) {
  section {
    padding: 48px 0;
  }

  h1 {
    font-size: 28px;
  }

  h2 {
    font-size: 24px;
  }

  h3 {
    font-size: 20px;
  }

  .page-title {
    font-size: 28px;
  }

  /* 页头 */
  .site-header {
    height: auto;
    min-height: var(--header-height);
  }

  .header-inner {
    flex-wrap: wrap;
    padding-top: 8px;
    padding-bottom: 8px;
    position: relative;
  }

  .brand-logo {
    margin-right: auto;
  }

  .brand-tag {
    display: none;
  }

  /* 移动导航 */
  .nav-toggle {
    display: flex;
    margin-left: auto;
    order: 2;
  }

  .nav-list {
    display: none;
    flex-direction: column;
    width: 100%;
    order: 3;
    background-color: var(--color-white);
    border-top: 1px solid var(--color-border);
    padding: 12px 0 16px;
    margin-top: 8px;
  }

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

  .nav-list li {
    width: 100%;
  }

  .nav-link {
    width: 100%;
    padding: 12px 16px;
    font-size: 16px;
    border-radius: var(--radius-sm);
    min-height: 44px;
  }

  .nav-toggle[aria-expanded="true"] .toggle-bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

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

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

  /* 面包屑 */
  .breadcrumb {
    padding-top: 16px;
    font-size: 13px;
  }

  /* 页面标题区 */
  .page-header {
    padding-top: 24px;
  }

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

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

  /* 首页 Hero */
  .hero-section {
    padding: 40px 0;
  }

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

  .hero-copy h1 {
    font-size: 30px;
  }

  .hero-lead {
    font-size: 16px;
  }

  .hero-actions {
    flex-direction: column;
    gap: 12px;
  }

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

  .hero-points {
    flex-direction: column;
    gap: 8px;
  }

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

  /* 首页服务 */
  .services-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .services-grid .service-card:nth-child(4) {
    grid-column: auto;
    display: block;
  }

  .services-grid .service-card:nth-child(4) h3 {
    margin-bottom: 12px;
  }

  .services-grid .service-card:nth-child(4) p {
    margin-bottom: 16px;
  }

  /* 首页案例 */
  .cases-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  /* 首页流程 */
  .process-timeline {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  /* 首页价值 */
  .value-layout {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  /* 首页 FAQ */
  .faq-grid {
    grid-template-columns: 1fr;
    gap: 0;
  }

  /* 首页 CTA */
  .cta-banner {
    flex-direction: column;
    align-items: flex-start;
    padding: 32px 24px;
    gap: 20px;
  }

  .cta-banner .btn-primary {
    width: 100%;
  }

  .cta-banner .cta-copy h2 {
    font-size: 22px;
  }

  /* 服务页 */
  .layout-shell.service-layout {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .service-item {
    grid-template-columns: 1fr;
    gap: 20px;
    padding: 32px 0;
  }

  .service-item-media figure {
    aspect-ratio: 16 / 10;
  }

  .aside-nav {
    position: static;
    margin-top: 0;
  }

  .cta-action {
    flex-direction: column;
    gap: 12px;
  }

  .cta-action .btn-primary,
  .cta-action .btn-secondary {
    width: 100%;
  }

  /* 案例页 */
  .section-block {
    padding: 40px 0;
  }

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

  .case-detail-item {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .case-detail-reverse .case-detail-media {
    order: 0;
  }

  .case-detail-reverse .case-detail-content {
    order: 0;
  }

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

  /* 流程页 */
  .step-item {
    grid-template-columns: 56px 1fr;
    gap: 16px;
    padding: 24px 0;
  }

  .step-number {
    width: 44px;
    height: 44px;
    font-size: 16px;
  }

  .step-content h2 {
    font-size: 19px;
  }

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

  .process-media figure {
    aspect-ratio: 4 / 3;
  }

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

  /* FAQ 页 */
  .faq-layout {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .faq-media figure {
    aspect-ratio: 4 / 3;
  }

  /* 咨询页 */
  .page-layout {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .step-card {
    flex-direction: column;
    gap: 12px;
    padding: 24px;
  }

  .consult-aside {
    position: static;
  }

  .cta-banner .cta-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
  }

  .cta-link {
    width: 100%;
    justify-content: center;
  }

  /* 指南页 */
  .chapter-layout {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .chapter-reverse .chapter-media {
    order: 0;
  }

  .chapter-reverse .chapter-text {
    order: 0;
  }

  .chapter-text h2 {
    font-size: 24px;
  }

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

  /* 页脚 */
  .footer-inner {
    grid-template-columns: 1fr;
    gap: 32px;
    padding-top: 48px;
    padding-bottom: 32px;
  }

  .footer-brand p {
    max-width: 100%;
  }

  .footer-bottom p {
    font-size: 12px;
  }

  /* 404 */
  .error-code {
    font-size: 72px;
  }

  .error-content h1 {
    font-size: 26px;
  }

  .error-actions {
    flex-direction: column;
    gap: 12px;
  }

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

  /* 相关推荐（首页底部） */
  .related-links-item {
    display: block;
    text-align: center;
    margin: 8px 0;
  }
}

/* ---------- 480px 以下（小屏手机） ---------- */
@media (max-width: 480px) {
  .header-inner,
  .footer-inner,
  .hero-layout,
  .services-section .section-header,
  .services-grid,
  .cases-section .section-header,
  .cases-grid,
  .process-section .section-header,
  .process-timeline,
  .value-layout,
  .faq-section .section-header,
  .faq-grid,
  .cta-banner,
  .layout-shell,
  .page-title-inner,
  .case-intro-inner,
  .related-links-inner,
  .process-steps,
  .prep-note,
  .prep-grid,
  .faq-layout,
  .more-links,
  .page-layout,
  .chapter-layout,
  .next-links .container,
  .error-content {
    padding-left: 16px;
    padding-right: 16px;
  }

  .breadcrumb {
    padding-left: 16px;
    padding-right: 16px;
  }

  .page-header {
    padding-left: 16px;
    padding-right: 16px;
  }

  .page-title-area {
    padding-left: 16px;
    padding-right: 16px;
  }

  .footer-bottom p {
    padding-left: 16px;
    padding-right: 16px;
  }

  .related-links .related-list {
    padding-left: 16px;
    padding-right: 16px;
  }

  .faq-media {
    padding-left: 16px;
    padding-right: 16px;
  }

  .brand-name {
    font-size: 19px;
  }

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

  .section-header h2 {
    font-size: 22px;
  }

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

  .service-card {
    padding: 24px 20px;
  }

  .case-card figcaption {
    font-size: 13px;
  }

  .faq-item summary {
    font-size: 15px;
    padding: 16px 16px;
  }

  .faq-item p {
    font-size: 14px;
    padding: 14px 16px;
  }
}

/* 程序验收反馈：修复网格孤项 */
@media (min-width: 769px) {
  .services-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}