/* ============================================================
   BASE
   ============================================================ */
:root {
  --primary: #123B5E;
  --primary-dark: #0E2E49;
  --primary-light: #1D4E78;
  --accent: #E9823C;
  --accent-dark: #D96F28;
  --bg: #F7F5F1;
  --text: #1F2933;
  --text-light: #5A6572;
  --border: #E2E0DA;
  --warning-bg: #FFF4E5;
  --white: #FFFFFF;
  --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --container: 1200px;
  --radius: 8px;
  --shadow-sm: 0 1px 3px rgba(18, 59, 94, 0.08);
  --shadow-md: 0 4px 12px rgba(18, 59, 94, 0.1);
  --transition: 0.2s ease;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

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

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

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

ul,
ol {
  list-style: none;
}

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

h1 {
  font-size: 32px;
}

h2 {
  font-size: 24px;
}

h3 {
  font-size: 18px;
}

p {
  max-width: 68ch;
}

button {
  font-family: var(--font-sans);
  cursor: pointer;
  border: none;
  background: none;
}

/* ============================================================
   LAYOUT - 全站骨架
   ============================================================ */
.site-body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

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

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

.brand {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.brand-name {
  font-size: 20px;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: 0;
}

.site-nav {
  display: flex;
  align-items: center;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-list a {
  display: inline-block;
  padding: 8px 14px;
  font-size: 15px;
  color: var(--text);
  border-radius: 4px;
  position: relative;
  transition: color var(--transition);
}

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

.nav-list a.is-current {
  color: var(--primary);
  font-weight: 700;
}

.nav-list a.is-current::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 2px;
  height: 2px;
  background: var(--accent);
  border-radius: 2px;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--white);
}

.nav-toggle-bar {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--primary);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

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

/* 内页统一容器 */
.inner-main {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px 64px;
}

/* 面包屑 */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 16px 0;
  font-size: 14px;
  color: var(--text-light);
}

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

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

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

.breadcrumb-current {
  color: var(--text);
  font-weight: 500;
}

/* 页面标题区 */
.page-header {
  padding: 32px 0 28px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 40px;
  background: var(--white);
}

.page-title {
  font-size: 32px;
  color: var(--primary);
  margin-bottom: 8px;
}

.page-description {
  font-size: 16px;
  color: var(--text-light);
  max-width: 68ch;
}

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

.footer-columns {
  max-width: var(--container);
  margin: 0 auto;
  padding: 48px 24px 32px;
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 40px;
}

.footer-col p {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.7);
  max-width: 40ch;
}

.footer-brand {
  font-size: 18px !important;
  font-weight: 700;
  color: var(--white) !important;
  margin-bottom: 8px;
}

.footer-heading {
  font-size: 15px;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 12px;
}

.footer-col a {
  display: block;
  padding: 4px 0;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.7);
}

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

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: 16px 24px;
  text-align: center;
}

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

/* 返回顶部按钮 */
.back-to-top {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--primary);
  color: var(--white);
  font-size: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  z-index: 50;
  transition: background var(--transition), transform var(--transition);
}

.back-to-top:hover {
  background: var(--accent);
  transform: translateY(-2px);
}

/* ============================================================
   COMPONENTS - 通用组件
   ============================================================ */
/* 按钮 */
.btn-primary {
  display: inline-block;
  padding: 12px 28px;
  background: var(--accent);
  color: var(--white);
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius);
  transition: background var(--transition), transform var(--transition);
}

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

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

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

.btn {
  display: inline-block;
  padding: 12px 28px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius);
}

/* 区块标题 */
.section-heading {
  margin-bottom: 32px;
  max-width: 68ch;
}

.section-heading h2 {
  font-size: 24px;
  color: var(--primary);
  margin-bottom: 8px;
  position: relative;
  padding-left: 16px;
}

.section-heading h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 4px;
  background: var(--accent);
  border-radius: 2px;
}

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

/* 提示框 */
.limitation,
.notice-box,
.notice {
  background: var(--warning-bg);
  border: 1px solid #F0DCC8;
  border-left: 4px solid var(--accent);
  border-radius: var(--radius);
  padding: 24px 28px;
  margin: 40px 0;
}

.aside-title,
.notice-title {
  font-size: 18px;
  color: var(--primary);
  margin-bottom: 12px;
}

.limitation p,
.notice-box p,
.notice p {
  font-size: 15px;
  color: var(--text);
  margin-bottom: 8px;
}

.limitation ul,
.notice-list,
.boundary-list {
  margin: 12px 0;
  padding-left: 20px;
}

.limitation ul li,
.notice-list li,
.boundary-list li {
  position: relative;
  padding: 4px 0;
  font-size: 15px;
  color: var(--text);
  line-height: 1.6;
}

.limitation ul li::before,
.notice-list li::before,
.boundary-list li::before {
  content: "·";
  position: absolute;
  left: -14px;
  color: var(--accent);
  font-weight: 700;
}

/* 相关栏目链接 */
.related-links {
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid var(--border);
}

.related-title {
  font-size: 18px;
  color: var(--primary);
  margin-bottom: 16px;
}

.related-links ul,
.related-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.related-links li,
.related-list li {
  margin: 0;
}

.related-links a,
.related-list a {
  display: inline-block;
  padding: 8px 18px;
  font-size: 14px;
  color: var(--primary);
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 4px;
  transition: border-color var(--transition), color var(--transition);
}

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

.related-links-item {
  display: inline-block;
  margin-top: 16px;
  font-size: 14px;
  font-weight: 600;
  color: var(--accent);
}

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

.faq-item summary {
  padding: 16px 20px;
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
  cursor: pointer;
  list-style: none;
  position: relative;
  padding-right: 48px;
  transition: color var(--transition);
}

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

.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 22px;
  color: var(--accent);
  transition: transform var(--transition);
}

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

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

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

/* 步骤卡片 */
.step-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow-sm);
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--primary);
  color: var(--white);
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 12px;
}

/* ============================================================
   PAGES - 首页
   ============================================================ */
.home-main {
  overflow: hidden;
}

/* Hero */
.hero {
  max-width: var(--container);
  margin: 0 auto;
  padding: 64px 24px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.hero-copy h1 {
  font-size: 36px;
  line-height: 1.3;
  margin-bottom: 16px;
}

.hero-copy p {
  font-size: 16px;
  color: var(--text-light);
  margin-bottom: 28px;
  line-height: 1.8;
}

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

.hero-media {
  position: relative;
}

.hero-media figure {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

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

/* 业务能力索引 */
.service-index {
  background: var(--white);
  padding: 64px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.service-index > .section-heading {
  max-width: var(--container);
  margin: 0 auto 32px;
  padding: 0 24px;
}

.service-panel {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 40px;
}

.service-list {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  align-self: start;
}

.service-list h3 {
  font-size: 16px;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}

.service-list ul li {
  margin-bottom: 4px;
}

.service-list ul a {
  display: block;
  padding: 10px 12px;
  font-size: 15px;
  color: var(--text);
  border-radius: 4px;
  transition: background var(--transition), color var(--transition);
}

.service-list ul a:hover {
  background: var(--primary);
  color: var(--white);
}

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

.service-detail article {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: box-shadow var(--transition), border-color var(--transition);
}

.service-detail article:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-md);
}

.service-detail article h3 {
  font-size: 17px;
  margin-bottom: 8px;
  color: var(--primary);
}

.service-detail article p {
  font-size: 14px;
  color: var(--text-light);
  line-height: 1.65;
  margin-bottom: 12px;
}

.service-detail article a {
  font-size: 14px;
  font-weight: 600;
  color: var(--accent);
}

/* 案例预览 */
.case-preview {
  max-width: var(--container);
  margin: 0 auto;
  padding: 64px 24px;
}

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

.case-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: box-shadow var(--transition), transform var(--transition);
}

.case-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.case-card figure {
  overflow: hidden;
}

.case-card figure img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.case-card:hover figure img {
  transform: scale(1.03);
}

.case-card h3 {
  font-size: 17px;
  padding: 20px 20px 8px;
  color: var(--primary);
}

.case-card p {
  font-size: 14px;
  color: var(--text-light);
  padding: 0 20px;
  line-height: 1.65;
  margin-bottom: 12px;
}

.case-card a {
  display: inline-block;
  margin: 0 20px 20px;
  font-size: 14px;
  font-weight: 600;
  color: var(--accent);
}

/* 制作流程预览 */
.process-preview {
  background: var(--white);
  padding: 64px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.process-preview > .section-heading {
  max-width: var(--container);
  margin: 0 auto 40px;
  padding: 0 24px;
}

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

.steps-list li {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  position: relative;
}

.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--accent);
  color: var(--white);
  font-size: 14px;
  font-weight: 700;
  margin-bottom: 12px;
}

.steps-list h3 {
  font-size: 16px;
  margin-bottom: 8px;
  color: var(--primary);
}

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

.link-more {
  display: inline-block;
  margin: 32px 24px 0;
  font-size: 15px;
  font-weight: 600;
  color: var(--accent);
}

/* FAQ 预览 */
.faq-teaser {
  max-width: var(--container);
  margin: 0 auto;
  padding: 64px 24px;
}

.faq-teaser .faq-item {
  max-width: 800px;
}

/* 合作启动横幅 */
.cta-banner {
  background: var(--primary);
  padding: 56px 24px;
  text-align: center;
}

.cta-banner h2 {
  color: var(--white);
  font-size: 26px;
  margin-bottom: 12px;
}

.cta-banner p {
  color: rgba(255, 255, 255, 0.8);
  margin: 0 auto 28px;
  max-width: 56ch;
}

/* ============================================================
   PAGES - 业务能力
   ============================================================ */
.service-list .section-title {
  margin-bottom: 32px;
}

.service-item {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
  padding: 48px 0;
  border-bottom: 1px solid var(--border);
}

.service-item:last-child {
  border-bottom: none;
}

.service-item-alt .service-media {
  order: 2;
}

.service-item-alt .service-content {
  order: 1;
}

.service-media {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

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

.service-content h3 {
  font-size: 22px;
  margin-bottom: 12px;
  color: var(--primary);
}

.service-content > p {
  font-size: 15px;
  color: var(--text-light);
  margin-bottom: 16px;
  line-height: 1.7;
}

.service-content ul {
  margin: 16px 0;
  padding-left: 0;
}

.service-content ul li {
  position: relative;
  padding: 6px 0 6px 20px;
  font-size: 15px;
  color: var(--text);
  line-height: 1.6;
}

.service-content ul li::before {
  content: "▪";
  position: absolute;
  left: 0;
  color: var(--accent);
  font-size: 12px;
  top: 8px;
}

.service-content ul + p {
  font-size: 14px;
  color: var(--text-light);
  margin-top: 16px;
  line-height: 1.6;
}

/* ============================================================
   PAGES - 制作流程
   ============================================================ */
.process-steps-section .section-title {
  margin-bottom: 8px;
}

.section-lead {
  color: var(--text-light);
  font-size: 15px;
  margin-bottom: 32px;
  max-width: 68ch;
}

.steps-list .step-item {
  background: none;
  border: none;
  padding: 0;
  position: relative;
}

.step-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  margin-bottom: 20px;
  box-shadow: var(--shadow-sm);
}

.step-card .step-number {
  width: 40px;
  height: 40px;
  font-size: 18px;
  background: var(--accent);
}

.step-content h3 {
  font-size: 18px;
  color: var(--primary);
  margin-bottom: 16px;
}

.step-goal,
.step-work,
.step-output,
.step-accept {
  padding: 8px 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--text);
  border-bottom: 1px dashed var(--border);
}

.step-goal:last-child,
.step-work:last-child,
.step-output:last-child,
.step-accept:last-child {
  border-bottom: none;
}

.step-goal::before {
  content: "目标：";
  font-weight: 700;
  color: var(--primary);
}

.step-work::before {
  content: "工作内容：";
  font-weight: 700;
  color: var(--primary);
}

.step-output::before {
  content: "产出：";
  font-weight: 700;
  color: var(--primary);
}

.step-accept::before {
  content: "验收标准：";
  font-weight: 700;
  color: var(--primary);
}

.process-media {
  margin: 32px 0;
  border-radius: var(--radius);
  overflow: hidden;
}

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

.process-media figcaption {
  padding: 12px 16px;
  background: var(--white);
  font-size: 13px;
  color: var(--text-light);
  border: 1px solid var(--border);
  border-top: none;
  border-radius: 0 0 var(--radius) var(--radius);
}

/* ============================================================
   PAGES - 案例参考
   ============================================================ */
.intro {
  margin-bottom: 40px;
}

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

.intro p {
  font-size: 15px;
  color: var(--text-light);
  line-height: 1.7;
}

.examples {
  display: flex;
  flex-direction: column;
  gap: 40px;
}

.examples > h2 {
  font-size: 22px;
  margin-bottom: 8px;
}

.examples .case-card {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.case-media {
  min-height: 280px;
}

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

.case-content {
  padding: 28px 28px 28px 0;
}

.case-content h3 {
  font-size: 20px;
  color: var(--primary);
  margin-bottom: 16px;
}

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

.case-content p strong {
  color: var(--primary);
  font-weight: 700;
  display: block;
  margin-bottom: 4px;
}

/* ============================================================
   PAGES - 常见问题
   ============================================================ */
.faq-groups {
  margin-bottom: 40px;
}

.faq-group-title {
  font-size: 19px;
  color: var(--primary);
  margin: 32px 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

.faq-group-title:first-child {
  margin-top: 0;
}

.faq-grid {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-grid .faq-item {
  margin-bottom: 0;
}

.service-boundary {
  background: var(--warning-bg);
  border: 1px solid #F0DCC8;
  border-left: 4px solid var(--accent);
  border-radius: var(--radius);
  padding: 24px 28px;
  margin: 40px 0;
}

.boundary-title {
  font-size: 18px;
  color: var(--primary);
  margin-bottom: 12px;
}

.service-boundary p {
  font-size: 15px;
  color: var(--text);
  margin-bottom: 8px;
}

.image-feature {
  margin: 40px 0;
}

.feature-figure {
  border-radius: var(--radius);
  overflow: hidden;
}

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

.feature-figure figcaption {
  padding: 12px 16px;
  background: var(--white);
  font-size: 13px;
  color: var(--text-light);
  border: 1px solid var(--border);
  border-top: none;
  border-radius: 0 0 var(--radius) var(--radius);
}

/* ============================================================
   PAGES - 合作启动
   ============================================================ */
.start-steps {
  margin-bottom: 48px;
}

.start-steps > h2 {
  font-size: 22px;
  margin-bottom: 8px;
}

.content-media {
  margin: 24px 0;
  border-radius: var(--radius);
  overflow: hidden;
}

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

.content-media figcaption {
  padding: 12px 16px;
  background: var(--white);
  font-size: 13px;
  color: var(--text-light);
  border: 1px solid var(--border);
  border-top: none;
  border-radius: 0 0 var(--radius) var(--radius);
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 24px;
}

.steps-grid .step-card {
  text-align: left;
}

.steps-grid .step-card h3 {
  font-size: 16px;
  margin-bottom: 8px;
}

.steps-grid .step-card p {
  font-size: 14px;
  color: var(--text-light);
  line-height: 1.65;
}

.checklist {
  margin-bottom: 40px;
}

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

.checklist-list {
  margin-top: 24px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.checklist-list li {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 24px;
}

.checklist-list li h3 {
  font-size: 16px;
  color: var(--primary);
  margin-bottom: 6px;
}

.checklist-list li p {
  font-size: 14px;
  color: var(--text-light);
  line-height: 1.65;
}

/* ============================================================
   PAGES - 404
   ============================================================ */
.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 80px 24px;
  min-height: 60vh;
}

.error-section {
  text-align: center;
  max-width: 520px;
}

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

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

.error-section p {
  font-size: 16px;
  color: var(--text-light);
  margin: 0 auto 28px;
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 1024px) {
  .service-panel {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .service-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    padding: 16px;
  }

  .service-list h3 {
    width: 100%;
    margin-bottom: 8px;
    padding-bottom: 8px;
  }

  .service-list ul {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
  }

  .service-list ul li {
    margin: 0;
  }

  .service-list ul a {
    padding: 8px 14px;
    font-size: 14px;
    border: 1px solid var(--border);
    background: var(--white);
    border-radius: 4px;
  }

  .service-detail {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .header-inner {
    height: 60px;
    padding: 0 16px;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    background: var(--white);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-md);
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding: 8px 16px 16px;
    gap: 4px;
  }

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

  .nav-list a {
    display: block;
    padding: 12px 16px;
    font-size: 16px;
    border-radius: 4px;
  }

  .nav-list a.is-current::after {
    display: none;
  }

  .nav-list a.is-current {
    background: var(--bg);
  }

  .inner-main {
    padding: 0 16px 48px;
  }

  .breadcrumb {
    padding: 12px 0;
    font-size: 13px;
    overflow-x: auto;
    white-space: nowrap;
  }

  .page-header {
    padding: 24px 0 20px;
    margin-bottom: 32px;
  }

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

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

  .footer-columns {
    grid-template-columns: 1fr;
    gap: 28px;
    padding: 36px 16px 24px;
  }

  .footer-bottom {
    padding: 12px 16px;
  }

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

  /* 首页 */
  .hero {
    grid-template-columns: 1fr;
    gap: 28px;
    padding: 40px 16px;
  }

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

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

  .hero-actions .btn-primary,
  .hero-actions .btn-secondary {
    text-align: center;
  }

  .hero-media img {
    height: 240px;
  }

  .service-index {
    padding: 48px 0;
  }

  .service-index > .section-heading {
    padding: 0 16px;
  }

  .service-panel {
    padding: 0 16px;
  }

  .service-detail {
    grid-template-columns: 1fr;
  }

  .case-preview {
    padding: 48px 16px;
  }

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

  .case-card figure img {
    height: 180px;
  }

  .process-preview {
    padding: 48px 0;
  }

  .process-preview > .section-heading {
    padding: 0 16px;
  }

  .steps-list {
    grid-template-columns: 1fr;
    padding: 0 16px;
    gap: 12px;
  }

  .faq-teaser {
    padding: 48px 16px;
  }

  .cta-banner {
    padding: 40px 16px;
  }

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

  .back-to-top {
    bottom: 16px;
    right: 16px;
    width: 40px;
    height: 40px;
    font-size: 18px;
  }

  /* 业务能力 */
  .service-item {
    grid-template-columns: 1fr;
    gap: 20px;
    padding: 32px 0;
  }

  .service-item-alt .service-media {
    order: 0;
  }

  .service-item-alt .service-content {
    order: 0;
  }

  .service-media img {
    height: 200px;
  }

  .service-content h3 {
    font-size: 19px;
  }

  /* 制作流程 */
  .step-card {
    padding: 20px;
  }

  .process-media img {
    height: 200px;
  }

  /* 案例 */
  .examples .case-card {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .case-media {
    min-height: 0;
  }

  .case-media img {
    height: 200px;
  }

  .case-content {
    padding: 20px;
  }

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

  /* FAQ */
  .faq-group-title {
    font-size: 17px;
  }

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

  /* 合作启动 */
  .steps-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .content-media img {
    height: 200px;
  }

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

  .checklist-list li {
    padding: 16px 18px;
  }

  /* 404 */
  .error-main {
    padding: 48px 16px;
  }

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

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

  /* 提示框 */
  .limitation,
  .notice-box,
  .notice,
  .service-boundary {
    padding: 18px 20px;
    margin: 28px 0;
  }
}

@media (max-width: 480px) {
  h1 {
    font-size: 24px;
  }

  h2 {
    font-size: 20px;
  }

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

  .hero-copy h1 {
    font-size: 24px;
  }

  .hero-copy p {
    font-size: 15px;
  }

  .btn-primary,
  .btn-secondary {
    padding: 10px 20px;
    font-size: 14px;
  }

  .service-detail article {
    padding: 20px;
  }

  .steps-list li {
    padding: 20px;
  }

  .faq-item summary {
    padding: 14px 44px 14px 16px;
    font-size: 15px;
  }

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

  .case-content p {
    font-size: 14px;
  }

  .step-goal,
  .step-work,
  .step-output,
  .step-accept {
    font-size: 14px;
  }

  .checklist-list li h3 {
    font-size: 15px;
  }

  .checklist-list li p {
    font-size: 13px;
  }

  .related-links a,
  .related-list a {
    padding: 8px 14px;
    font-size: 13px;
  }
}