/* ============================================================
   51大赛 · 全站样式表
   视觉方向：高对比无障碍风 / 杂志目录式
   ============================================================ */

/* ------------------------------------------------------------
   1. Base — 基础变量与全局样式
   ------------------------------------------------------------ */
:root {
  --color-ink: #14213d;
  --color-ink-soft: #2a3a5e;
  --color-accent: #fca311;
  --color-accent-dark: #d98a00;
  --color-gray: #e5e5e5;
  --color-gray-light: #f3f4f6;
  --color-white: #ffffff;
  --color-text: #111827;
  --color-text-muted: #4b5563;
  --color-border: #d1d5db;
  --color-link: #1d4ed8;
  --color-link-visited: #6d28d9;
  --color-focus: #fca311;

  --font-sans: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'PingFang SC', 'Microsoft YaHei', sans-serif;

  --container-width: 1200px;
  --container-pad: 24px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 8px;
  --radius-pill: 999px;

  --header-h: 68px;
  --transition: 0.2s ease;
}

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

html {
  font-size: 16px;
  line-height: 1.7;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-white);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

a {
  color: var(--color-link);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
  transition: color var(--transition), text-decoration-color var(--transition);
}

a:hover {
  color: var(--color-accent-dark);
  text-decoration-color: currentColor;
}

a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

ul,
ol {
  list-style-position: inside;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  color: var(--color-ink);
  line-height: 1.3;
  font-weight: 700;
  margin-bottom: 0.6em;
}

h1 {
  font-size: 2.25rem; /* 36px */
  line-height: 1.3;
}

h2 {
  font-size: 1.75rem; /* 28px */
  line-height: 1.4;
}

h3 {
  font-size: 1.375rem; /* 22px */
  line-height: 1.5;
}

h4 {
  font-size: 1.125rem;
  line-height: 1.5;
}

p {
  margin-bottom: 1em;
}

section {
  margin-bottom: 2.5rem;
}

/* 站点整体骨架 */
.site-header {
  background-color: var(--color-ink);
  position: sticky;
  top: 0;
  z-index: 100;
  width: 100%;
}

.header-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--container-pad);
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand-logo {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-white);
  text-decoration: none;
  letter-spacing: 0.02em;
  line-height: 1.2;
  white-space: nowrap;
  flex-shrink: 0;
}

.brand-logo:hover {
  color: var(--color-accent);
}

.site-nav {
  display: block;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-list li {
  margin: 0;
  padding: 0;
}

.nav-list a {
  display: block;
  padding: 8px 14px;
  color: var(--color-gray);
  text-decoration: none;
  font-size: 0.9375rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  border-bottom: 2px solid transparent;
  transition: color var(--transition), border-color var(--transition), background-color var(--transition);
}

.nav-list a:hover {
  color: var(--color-white);
  border-bottom-color: var(--color-accent);
  background-color: rgba(255, 255, 255, 0.06);
}

.nav-list a.is-current {
  color: var(--color-white);
  border-bottom-color: var(--color-accent);
  font-weight: 600;
}

/* 汉堡按钮 */
.nav-toggle {
  display: none;
  background: none;
  border: 1px solid rgba(255, 255, 255, 0.4);
  border-radius: var(--radius-sm);
  padding: 8px;
  cursor: pointer;
  width: 44px;
  height: 44px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
}

.nav-toggle-line {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-white);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

/* 主内容区域 */
.site-main {
  flex: 1 0 auto;
  width: 100%;
}

/* 页脚 */
.site-footer {
  background-color: var(--color-ink);
  color: var(--color-gray);
  margin-top: 3rem;
  flex-shrink: 0;
}

.footer-columns {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px var(--container-pad) 32px;
  display: grid;
  grid-template-columns: 1.4fr 0.8fr 1fr 1fr;
  gap: 32px;
}

.footer-col h3 {
  color: var(--color-white);
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

.footer-col ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-col ul li {
  margin-bottom: 0.5rem;
  padding: 0;
}

.footer-col a {
  color: var(--color-gray);
  text-decoration: none;
  font-size: 0.9375rem;
  line-height: 1.6;
  display: inline-block;
  padding: 2px 0;
}

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

.footer-brand {
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 0.75rem;
}

.brand-col p:last-child {
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--color-gray);
  margin-bottom: 0;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding: 20px var(--container-pad);
  text-align: center;
}

.footer-bottom p {
  max-width: var(--container-width);
  margin: 0 auto;
  font-size: 0.875rem;
  color: #9ca3af;
  margin-bottom: 0;
}

/* ------------------------------------------------------------
   2. Layout — 版面骨架
   ------------------------------------------------------------ */

/* 通用容器 */
.site-main {
  width: 100%;
}

.inner-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--container-pad) 48px;
  width: 100%;
}

/* 面包屑 */
.breadcrumb {
  padding: 16px 0;
  font-size: 0.875rem;
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
}

.breadcrumb a {
  color: var(--color-text-muted);
  text-decoration: underline;
  text-underline-offset: 2px;
}

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

.breadcrumb-sep {
  color: #9ca3af;
  margin: 0 2px;
}

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

/* 页面标题区 */
.page-header {
  background-color: var(--color-gray-light);
  border-left: 4px solid var(--color-accent);
  padding: 32px var(--container-pad);
  margin: 0 0 32px;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.page-title {
  font-size: 2rem;
  line-height: 1.3;
  margin-bottom: 0.5rem;
  color: var(--color-ink);
}

.page-description {
  font-size: 1.0625rem;
  color: var(--color-text-muted);
  margin-bottom: 0;
  max-width: 720px;
}

/* 首页主容器 */
.home-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--container-pad) 48px;
  width: 100%;
}

/* ------------------------------------------------------------
   3. Components — 通用组件
   ------------------------------------------------------------ */

/* 按钮 */
.btn-primary {
  display: inline-block;
  background-color: var(--color-accent);
  color: var(--color-ink);
  font-weight: 700;
  font-size: 1rem;
  padding: 12px 28px;
  border-radius: var(--radius-md);
  text-decoration: none;
  border: 2px solid var(--color-accent);
  cursor: pointer;
  transition: background-color var(--transition), color var(--transition), border-color var(--transition);
}

.btn-primary:hover {
  background-color: var(--color-accent-dark);
  border-color: var(--color-accent-dark);
  color: var(--color-white);
  text-decoration: none;
}

.btn-secondary {
  display: inline-block;
  background-color: transparent;
  color: var(--color-ink);
  font-weight: 600;
  font-size: 1rem;
  padding: 12px 28px;
  border-radius: var(--radius-md);
  text-decoration: none;
  border: 2px solid var(--color-ink);
  cursor: pointer;
  transition: background-color var(--transition), color var(--transition), border-color var(--transition);
}

.btn-secondary:hover {
  background-color: var(--color-ink);
  color: var(--color-white);
  text-decoration: none;
}

/* 文本链接 */
.text-link {
  color: var(--color-link);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
  display: inline-block;
  padding: 4px 0;
}

.text-link:hover {
  color: var(--color-accent-dark);
}

/* 区块标题 */
.section-title {
  font-size: 1.75rem;
  color: var(--color-ink);
  margin-bottom: 0.5rem;
  position: relative;
  padding-bottom: 0.5rem;
}

.section-title::after {
  content: '';
  display: block;
  width: 48px;
  height: 4px;
  background-color: var(--color-accent);
  border-radius: 2px;
  margin-top: 8px;
}

/* 相关链接 */
.related-links {
  background-color: var(--color-gray-light);
  border-radius: var(--radius-md);
  padding: 24px var(--container-pad);
  margin-top: 32px;
  border: 1px solid var(--color-gray);
}

.related-links h2 {
  font-size: 1.25rem;
  margin-bottom: 1rem;
}

.related-links ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
}

.related-links li {
  margin: 0;
  padding: 0;
}

.related-links a {
  color: var(--color-link);
  text-decoration: underline;
  font-weight: 500;
  display: inline-block;
  padding: 4px 0;
}

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

/* 内容图片 */
.content-media {
  margin: 0 0 1.5rem;
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: var(--color-gray-light);
}

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

.content-media figcaption {
  padding: 8px 16px;
  background-color: var(--color-gray);
  font-size: 0.875rem;
  color: var(--color-text-muted);
  text-align: center;
}

.content-media-inline {
  margin: 1.5rem 0;
}

/* ------------------------------------------------------------
   4. Pages — 页面专属
   ------------------------------------------------------------ */

/* ===== 首页 index.html ===== */

/* Hero 封面区 */
.hero-section {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 40px;
  align-items: center;
  padding: 48px 0 40px;
  margin-bottom: 0;
}

.hero-content {
  padding: 0;
}

.hero-issue {
  display: inline-block;
  background-color: var(--color-ink);
  color: var(--color-accent);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  margin-bottom: 1rem;
}

.hero-title {
  font-size: 2.25rem;
  line-height: 1.3;
  margin-bottom: 0.75rem;
  color: var(--color-ink);
}

.hero-lead {
  font-size: 1.125rem;
  color: var(--color-text-muted);
  margin-bottom: 1.5rem;
  max-width: 520px;
}

.hero-media {
  margin: 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
}

.hero-media img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

/* 今日大赛快速入口 */
.daily-focus {
  background-color: var(--color-gray-light);
  border: 1px solid var(--color-gray);
  border-radius: var(--radius-md);
  padding: 28px 32px;
  margin-bottom: 2.5rem;
}

.daily-focus-inner {
  max-width: 780px;
}

.daily-focus .section-title {
  font-size: 1.375rem;
}

.daily-focus p {
  margin-bottom: 0.75rem;
  color: var(--color-text);
}

/* 页内锚点导航 */
.anchor-nav {
  background-color: var(--color-white);
  border: 1px solid var(--color-gray);
  border-radius: var(--radius-md);
  padding: 0;
  margin-bottom: 2.5rem;
}

.anchor-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}

.anchor-nav li {
  margin: 0;
  padding: 0;
  border-right: 1px solid var(--color-gray);
}

.anchor-nav li:last-child {
  border-right: none;
}

.anchor-nav a {
  display: block;
  padding: 16px 20px;
  text-align: center;
  color: var(--color-ink);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.9375rem;
  transition: background-color var(--transition), color var(--transition);
}

.anchor-nav a:hover {
  background-color: var(--color-gray-light);
  color: var(--color-accent-dark);
  text-decoration: underline;
}

/* 服务能力摘要 */
.services-summary {
  margin-bottom: 2.5rem;
  padding-top: 8px;
}

.services-layout {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 32px;
  align-items: start;
  padding-top: 16px;
}

.service-category-list {
  background-color: var(--color-gray-light);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-gray);
  padding: 24px;
}

.list-heading {
  font-size: 1.125rem;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--color-accent);
}

.service-category-list ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.service-category-list li {
  margin: 0;
  padding: 0;
  border-bottom: 1px solid var(--color-gray);
}

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

.service-category-list a {
  display: block;
  padding: 12px 8px;
  color: var(--color-ink);
  text-decoration: none;
  font-weight: 500;
  transition: color var(--transition), padding-left var(--transition);
}

.service-category-list a:hover {
  color: var(--color-accent-dark);
  padding-left: 16px;
  text-decoration: underline;
}

.service-detail-preview {
  background-color: var(--color-white);
  border: 1px solid var(--color-gray);
  border-left: 4px solid var(--color-accent);
  border-radius: var(--radius-md);
  padding: 28px;
}

.preview-title {
  font-size: 1.375rem;
  margin-bottom: 0.75rem;
}

.service-detail-preview p {
  color: var(--color-text-muted);
  margin-bottom: 1rem;
}

/* 业务场景预览 */
.scenarios-preview {
  margin-bottom: 2.5rem;
  padding-top: 8px;
}

.scenario-card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  padding-top: 16px;
}

.scenario-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-gray);
  border-radius: var(--radius-md);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: box-shadow var(--transition), transform var(--transition);
}

.scenario-card:hover {
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.08);
  transform: translateY(-2px);
}

.card-media {
  margin: 0;
  overflow: hidden;
  background-color: var(--color-gray-light);
}

.card-media img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.scenario-card h3 {
  padding: 16px 20px 0;
  font-size: 1.25rem;
}

.scenario-card p {
  padding: 0 20px;
  color: var(--color-text-muted);
  font-size: 0.9375rem;
  margin-bottom: 1rem;
  flex-grow: 1;
}

.card-link {
  display: inline-block;
  margin: 0 20px 20px;
  color: var(--color-link);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
  padding: 4px 0;
}

.card-link:hover {
  color: var(--color-accent-dark);
}

/* 合作流程步骤条 */
.process-steps {
  margin-bottom: 2.5rem;
  padding-top: 8px;
}

.process-step-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  padding-top: 16px;
}

.process-step {
  background-color: var(--color-gray-light);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-gray);
  padding: 20px;
  position: relative;
}

.process-step .step-number {
  display: inline-block;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background-color: var(--color-accent);
  color: var(--color-ink);
  font-weight: 700;
  font-size: 1.125rem;
  text-align: center;
  line-height: 36px;
  margin-bottom: 0.75rem;
}

.process-step h3 {
  font-size: 1.125rem;
  margin-bottom: 0.5rem;
}

.process-step p {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  margin-bottom: 0;
}

.process-steps .text-link {
  margin-top: 1.25rem;
  display: inline-block;
}

/* FAQ 预览 */
.faq-preview {
  margin-bottom: 2.5rem;
  padding-top: 8px;
}

.faq-preview-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  padding-top: 16px;
  margin-bottom: 20px;
}

.faq-preview-item {
  background-color: var(--color-white);
  border: 1px solid var(--color-gray);
  border-radius: var(--radius-md);
  padding: 20px;
}

.faq-preview-item h3 {
  font-size: 1.125rem;
  margin-bottom: 0.5rem;
}

.faq-preview-item p {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  margin-bottom: 0.75rem;
}

/* ===== 内页：行业观察 51ds/insights.html ===== */

.page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 32px;
  align-items: start;
}

.content-main {
  min-width: 0;
  width: 100%;
}

/* 方法分类 */
.method-categories {
  margin-bottom: 2rem;
}

.method-categories > h2 {
  font-size: 1.375rem;
  margin-bottom: 0.5rem;
}

.method-categories > p {
  color: var(--color-text-muted);
  margin-bottom: 1rem;
}

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

.category-card {
  background-color: var(--color-gray-light);
  border: 1px solid var(--color-gray);
  border-radius: var(--radius-md);
  padding: 20px;
}

.category-card h3 {
  font-size: 1.125rem;
  margin-bottom: 0.5rem;
}

.category-card p {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  margin-bottom: 0;
}

/* 文章列表 */
.article-list-section {
  margin-bottom: 2rem;
}

.article-list-section > h2 {
  font-size: 1.375rem;
  margin-bottom: 1rem;
}

.article-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.article-item {
  display: grid;
  grid-template-columns: 200px minmax(0, 1fr);
  gap: 16px;
  background-color: var(--color-white);
  border: 1px solid var(--color-gray);
  border-radius: var(--radius-md);
  padding: 12px;
  align-items: start;
}

.article-media {
  margin: 0;
  border-radius: var(--radius-sm);
  overflow: hidden;
  background-color: var(--color-gray-light);
}

.article-media img {
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

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

.article-content h3 {
  font-size: 1.125rem;
  margin-bottom: 0.375rem;
}

.article-content h3 a {
  color: var(--color-ink);
  text-decoration: none;
}

.article-content h3 a:hover {
  color: var(--color-accent-dark);
  text-decoration: underline;
}

.article-content p {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  margin-bottom: 0.5rem;
}

/* 侧栏 */
.content-sidebar {
  min-width: 0;
}

.tag-section,
.service-recommend {
  background-color: var(--color-gray-light);
  border: 1px solid var(--color-gray);
  border-radius: var(--radius-md);
  padding: 20px;
  margin-bottom: 20px;
}

.tag-section h2,
.service-recommend h2 {
  font-size: 1.125rem;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--color-accent);
}

.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag-cloud a {
  display: inline-block;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  padding: 4px 14px;
  font-size: 0.875rem;
  color: var(--color-ink);
  text-decoration: none;
  transition: background-color var(--transition), border-color var(--transition), color var(--transition);
}

.tag-cloud a:hover {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-ink);
  text-decoration: none;
}

.service-recommend ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.service-recommend li {
  margin: 0;
  padding: 0;
  border-bottom: 1px solid var(--color-gray);
}

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

.service-recommend a {
  display: block;
  padding: 10px 4px;
  color: var(--color-link);
  text-decoration: underline;
  font-weight: 500;
}

.service-recommend a:hover {
  color: var(--color-accent-dark);
}

/* ===== 内页：服务能力 51ds/services.html ===== */

/* 服务表格 */
.service-table-section {
  margin-bottom: 2.5rem;
}

.service-table-section > h2 {
  font-size: 1.375rem;
  margin-bottom: 0.5rem;
}

.service-table-section > p {
  color: var(--color-text-muted);
  margin-bottom: 1rem;
}

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--color-gray);
  border-radius: var(--radius-md);
  background-color: var(--color-white);
}

.service-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9375rem;
}

.service-table th,
.service-table td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--color-gray);
  vertical-align: top;
}

.service-table th {
  background-color: var(--color-ink);
  color: var(--color-white);
  font-weight: 600;
  white-space: nowrap;
}

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

.service-table td {
  color: var(--color-text);
  min-width: 160px;
}

/* 能力区块 */
.capability-sections {
  margin-bottom: 2.5rem;
}

.capability-sections > h2 {
  font-size: 1.375rem;
  margin-bottom: 1.5rem;
}

.capability-block {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  gap: 24px;
  margin-bottom: 32px;
  background-color: var(--color-white);
  border: 1px solid var(--color-gray);
  border-radius: var(--radius-md);
  padding: 20px;
}

.capability-media {
  margin: 0;
  border-radius: var(--radius-sm);
  overflow: hidden;
  background-color: var(--color-gray-light);
}

.capability-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  aspect-ratio: 4 / 3;
}

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

.capability-content > h3 {
  font-size: 1.375rem;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--color-accent);
}

.capability-item {
  margin-bottom: 1rem;
}

.capability-item h4 {
  font-size: 1rem;
  margin-bottom: 0.25rem;
  color: var(--color-ink);
}

.capability-item p {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  margin-bottom: 0;
}

/* 工作流摘要 */
.workflow-summary {
  margin-bottom: 2.5rem;
  background-color: var(--color-gray-light);
  border: 1px solid var(--color-gray);
  border-radius: var(--radius-md);
  padding: 24px;
}

.workflow-summary > h2 {
  font-size: 1.375rem;
  margin-bottom: 0.5rem;
}

.workflow-summary > p {
  color: var(--color-text-muted);
  margin-bottom: 1rem;
}

.workflow-steps {
  list-style: none;
  margin: 0 0 1rem;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.workflow-step {
  background-color: var(--color-white);
  border: 1px solid var(--color-gray);
  border-radius: var(--radius-md);
  padding: 16px;
}

.workflow-step .step-num {
  display: inline-block;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background-color: var(--color-accent);
  color: var(--color-ink);
  font-weight: 700;
  text-align: center;
  line-height: 32px;
  font-size: 1rem;
  margin-bottom: 0.5rem;
}

.workflow-step h3 {
  font-size: 1.0625rem;
  margin-bottom: 0.375rem;
}

.workflow-step p {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-bottom: 0;
}

/* ===== 内页：业务场景 51ds/scenarios.html ===== */

/* 分类导航 */
.category-nav {
  margin-bottom: 2rem;
}

.category-tags {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.category-tags li {
  margin: 0;
  padding: 0;
}

.category-tags a {
  display: inline-block;
  background-color: var(--color-gray-light);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  padding: 6px 18px;
  font-size: 0.9375rem;
  color: var(--color-ink);
  text-decoration: none;
  font-weight: 500;
  transition: background-color var(--transition), border-color var(--transition), color var(--transition);
}

.category-tags a:hover {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-ink);
  text-decoration: none;
}

/* 场景列表 */
.scenario-list {
  display: flex;
  flex-direction: column;
  gap: 32px;
  margin-bottom: 2.5rem;
}

.scenario-item {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 24px;
  background-color: var(--color-white);
  border: 1px solid var(--color-gray);
  border-radius: var(--radius-md);
  padding: 20px;
  align-items: start;
}

.scenario-media {
  margin: 0;
  border-radius: var(--radius-sm);
  overflow: hidden;
  background-color: var(--color-gray-light);
}

.scenario-media img {
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

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

.scenario-content h2 {
  font-size: 1.375rem;
  margin-bottom: 0.5rem;
}

.scenario-content > p {
  color: var(--color-text-muted);
  margin-bottom: 0.75rem;
}

.scenario-content h3 {
  font-size: 1rem;
  margin-bottom: 0.5rem;
}

.service-tags {
  list-style: none;
  margin: 0 0 0.75rem;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.service-tags li {
  margin: 0;
  padding: 0;
}

.service-tags a {
  display: inline-block;
  background-color: var(--color-gray-light);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  padding: 3px 12px;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  text-decoration: none;
}

.service-tags a:hover {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-ink);
  text-decoration: none;
}

/* 咨询入口 */
.consult-entry {
  background-color: var(--color-ink);
  border-radius: var(--radius-md);
  padding: 32px;
  color: var(--color-white);
  margin-bottom: 2.5rem;
}

.consult-entry h2 {
  color: var(--color-white);
  font-size: 1.375rem;
  margin-bottom: 0.5rem;
}

.consult-entry p {
  color: var(--color-gray);
  margin-bottom: 1rem;
}

.consult-entry p:last-child {
  margin-bottom: 0;
}

.consult-entry a {
  color: var(--color-accent);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
  margin-right: 16px;
}

.consult-entry a:hover {
  color: var(--color-white);
}

/* ===== 内页：合作流程 51ds/process.html ===== */

/* 流程标签 */
.process-tabs {
  margin-bottom: 2.5rem;
}

.process-tabs .section-title {
  font-size: 1.375rem;
}

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

.tab-item {
  background-color: var(--color-gray-light);
  border: 1px solid var(--color-gray);
  border-radius: var(--radius-md);
  padding: 16px;
  text-align: center;
}

.tab-item .tab-number {
  display: inline-block;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background-color: var(--color-accent);
  color: var(--color-ink);
  font-weight: 700;
  font-size: 1.125rem;
  line-height: 36px;
  margin-bottom: 0.5rem;
}

.tab-item h3 {
  font-size: 1.0625rem;
  margin-bottom: 0.25rem;
}

.tab-item p {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-bottom: 0;
}

/* 流程详情 */
.process-details {
  margin-bottom: 2.5rem;
}

.process-details .section-title {
  font-size: 1.375rem;
}

.process-stage {
  background-color: var(--color-white);
  border: 1px solid var(--color-gray);
  border-radius: var(--radius-md);
  margin-bottom: 16px;
  overflow: hidden;
}

.stage-head {
  display: flex;
  align-items: center;
  gap: 12px;
  background-color: var(--color-gray-light);
  padding: 16px 20px;
  border-bottom: 1px solid var(--color-gray);
}

.stage-head .stage-number {
  display: inline-block;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background-color: var(--color-accent);
  color: var(--color-ink);
  font-weight: 700;
  text-align: center;
  line-height: 32px;
  font-size: 1rem;
  flex-shrink: 0;
}

.stage-head h3 {
  font-size: 1.125rem;
  margin-bottom: 0;
}

.stage-content {
  padding: 20px;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 20px;
}

.stage-goal h4,
.stage-actions h4,
.stage-deliverable h4 {
  font-size: 0.9375rem;
  margin-bottom: 0.5rem;
  color: var(--color-ink);
  padding-bottom: 0.25rem;
  border-bottom: 2px solid var(--color-accent);
  display: inline-block;
}

.stage-goal p,
.stage-deliverable p {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  margin-bottom: 0;
}

.stage-actions ul {
  list-style: disc;
  margin: 0;
  padding-left: 18px;
}

.stage-actions li {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  margin-bottom: 0.25rem;
}

/* 联系卡片 */
.contact-entry {
  margin-bottom: 2.5rem;
}

.contact-card {
  background-color: var(--color-ink);
  border-radius: var(--radius-md);
  padding: 32px;
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 24px;
  align-items: center;
}

.contact-text h2 {
  color: var(--color-white);
  font-size: 1.375rem;
  margin-bottom: 0.5rem;
}

.contact-text p {
  color: var(--color-gray);
  margin-bottom: 0.75rem;
}

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

.contact-text a {
  color: var(--color-accent);
  font-weight: 600;
}

.contact-text a:hover {
  color: var(--color-white);
}

.contact-action {
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-items: flex-start;
}

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

.contact-action .btn-secondary {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.contact-action .btn-secondary:hover {
  background-color: var(--color-accent);
  color: var(--color-ink);
}

/* 合作须知 */
.process-notes {
  margin-bottom: 2.5rem;
}

.process-notes .section-title {
  font-size: 1.375rem;
}

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

.note-item {
  background-color: var(--color-gray-light);
  border: 1px solid var(--color-gray);
  border-radius: var(--radius-md);
  padding: 16px;
}

.note-item h3 {
  font-size: 1rem;
  margin-bottom: 0.375rem;
}

.note-item p {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  margin-bottom: 0;
}

/* FAQ 链接 */
.faq-links {
  margin-bottom: 2.5rem;
}

.faq-links .section-title {
  font-size: 1.375rem;
}

.faq-link-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.faq-link-item {
  background-color: var(--color-white);
  border: 1px solid var(--color-gray);
  border-radius: var(--radius-md);
  padding: 16px;
}

.faq-link-item h3 {
  font-size: 1rem;
  margin-bottom: 0.375rem;
}

.faq-link-item p {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  margin-bottom: 0.5rem;
}

.faq-link-item a {
  color: var(--color-link);
  font-weight: 600;
  text-decoration: underline;
}

.faq-link-item a:hover {
  color: var(--color-accent-dark);
}

/* 相关链接网格 */
.related-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.related-grid a {
  display: block;
  background-color: var(--color-white);
  border: 1px solid var(--color-gray);
  border-radius: var(--radius-md);
  padding: 16px;
  color: var(--color-link);
  text-decoration: underline;
  font-weight: 500;
  transition: background-color var(--transition), border-color var(--transition);
}

.related-grid a:hover {
  background-color: var(--color-gray-light);
  border-color: var(--color-accent);
  color: var(--color-accent-dark);
}

/* ===== 内页：常见问题 51ds/faq.html ===== */

/* FAQ 分类 */
.faq-categories {
  margin-bottom: 2rem;
}

.faq-categories h2 {
  font-size: 1.375rem;
  margin-bottom: 1rem;
}

.faq-cat-image {
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  margin-top: 16px;
  aspect-ratio: 21 / 6;
  object-fit: cover;
}

/* FAQ 列表 */
.faq-list {
  margin-bottom: 2.5rem;
}

.faq-list > h2 {
  font-size: 1.375rem;
  margin-bottom: 1rem;
}

.faq-category-heading {
  font-size: 1.125rem;
  margin: 1.5rem 0 0.75rem;
  padding-bottom: 0.375rem;
  border-bottom: 2px solid var(--color-accent);
  display: inline-block;
}

.faq-item {
  background-color: var(--color-white);
  border: 1px solid var(--color-gray);
  border-radius: var(--radius-sm);
  margin-bottom: 8px;
  overflow: hidden;
}

.faq-item summary {
  padding: 16px 20px;
  font-weight: 600;
  color: var(--color-ink);
  cursor: pointer;
  list-style: none;
  position: relative;
  padding-right: 40px;
  transition: background-color var(--transition);
}

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

.faq-item summary::after {
  content: '+';
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.5rem;
  font-weight: 400;
  color: var(--color-accent-dark);
  transition: transform var(--transition);
}

.faq-item[open] summary::after {
  transform: translateY(-50%) rotate(45deg);
}

.faq-item[open] summary {
  background-color: var(--color-gray-light);
}

.faq-item summary:hover {
  background-color: var(--color-gray-light);
}

.faq-answer {
  padding: 0 20px 16px;
  border-top: 1px solid var(--color-gray);
  padding-top: 12px;
}

.faq-answer p {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  margin-bottom: 0;
}

/* 帮助中心 */
.help-center {
  background-color: var(--color-gray-light);
  border: 1px solid var(--color-gray);
  border-radius: var(--radius-md);
  padding: 24px;
  margin-bottom: 2.5rem;
}

.help-center h2 {
  font-size: 1.375rem;
  margin-bottom: 0.5rem;
}

.help-center p {
  color: var(--color-text-muted);
  margin-bottom: 0.75rem;
}

.help-center a {
  color: var(--color-link);
  font-weight: 600;
  margin-right: 16px;
}

.help-center a:hover {
  color: var(--color-accent-dark);
}

.help-image {
  width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
  margin-top: 12px;
  aspect-ratio: 21 / 5;
  object-fit: cover;
}

/* ===== 内页：关于我们 51ds/about.html ===== */

.main-content {
  min-width: 0;
  width: 100%;
}

/* 团队职责 */
.team-roles {
  margin-bottom: 2.5rem;
}

.team-roles > h2 {
  font-size: 1.375rem;
  margin-bottom: 0.5rem;
}

.team-roles > p {
  color: var(--color-text-muted);
  margin-bottom: 1rem;
}

.role-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.role-list li {
  background-color: var(--color-gray-light);
  border: 1px solid var(--color-gray);
  border-radius: var(--radius-md);
  padding: 16px;
}

.role-list h3 {
  font-size: 1.0625rem;
  margin-bottom: 0.375rem;
}

.role-list p {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  margin-bottom: 0;
}

/* 参与项目 */
.project-types {
  margin-bottom: 2.5rem;
}

.project-types > h2 {
  font-size: 1.375rem;
  margin-bottom: 0.5rem;
}

.project-types > p {
  color: var(--color-text-muted);
  margin-bottom: 1rem;
}

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

.project-type-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-gray);
  border-radius: var(--radius-md);
  padding: 16px;
}

.project-type-card h3 {
  font-size: 1.0625rem;
  margin-bottom: 0.375rem;
}

.project-type-card p {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  margin-bottom: 0;
}

/* 工作原则 */
.work-principles {
  margin-bottom: 2.5rem;
}

.work-principles > h2 {
  font-size: 1.375rem;
  margin-bottom: 0.5rem;
}

.work-principles > p {
  color: var(--color-text-muted);
  margin-bottom: 1rem;
}

.principles-list {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: principle;
}

.principles-list li {
  counter-increment: principle;
  background-color: var(--color-gray-light);
  border: 1px solid var(--color-gray);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  margin-bottom: 12px;
  position: relative;
  padding-left: 56px;
}

.principles-list li::before {
  content: counter(principle, decimal-leading-zero);
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background-color: var(--color-accent);
  color: var(--color-ink);
  font-weight: 700;
  font-size: 0.875rem;
  text-align: center;
  line-height: 28px;
}

.principles-list h3 {
  font-size: 1.0625rem;
  margin-bottom: 0.25rem;
}

.principles-list p {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  margin-bottom: 0;
}

/* 联系流程 */
.contact-flow {
  margin-bottom: 2.5rem;
}

.contact-flow > h2 {
  font-size: 1.375rem;
  margin-bottom: 0.5rem;
}

.contact-flow > p {
  color: var(--color-text-muted);
  margin-bottom: 1rem;
}

.contact-steps {
  list-style: none;
  margin: 0 0 1rem;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.contact-steps li {
  background-color: var(--color-white);
  border: 1px solid var(--color-gray);
  border-radius: var(--radius-md);
  padding: 16px;
  font-size: 0.9375rem;
  color: var(--color-text-muted);
}

.contact-steps strong {
  display: block;
  color: var(--color-ink);
  font-size: 1rem;
  margin-bottom: 0.375rem;
}

.contact-steps a {
  color: var(--color-link);
  font-weight: 600;
  display: inline-block;
  margin-top: 0.25rem;
}

.contact-flow > p:last-child a {
  color: var(--color-link);
  font-weight: 600;
}

/* 合规说明 */
.compliance-note {
  background-color: var(--color-gray-light);
  border: 1px solid var(--color-gray);
  border-radius: var(--radius-md);
  padding: 20px;
  margin-bottom: 2.5rem;
}

.compliance-note h2 {
  font-size: 1.125rem;
  margin-bottom: 0.5rem;
}

.compliance-note p {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  margin-bottom: 0;
}

/* 关于页侧栏 */
.sidebar {
  min-width: 0;
}

.sidebar-card {
  background-color: var(--color-gray-light);
  border: 1px solid var(--color-gray);
  border-radius: var(--radius-md);
  padding: 20px;
  margin-bottom: 16px;
}

.sidebar-card h3 {
  font-size: 1.0625rem;
  margin-bottom: 0.5rem;
}

.sidebar-card p {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  margin-bottom: 0.5rem;
}

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

/* ===== 404 页面 ===== */

.error-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--container-pad) 48px;
  width: 100%;
}

.error-section {
  text-align: center;
  padding: 80px 24px 60px;
}

.error-code {
  font-size: 5rem;
  font-weight: 800;
  color: var(--color-accent);
  line-height: 1.1;
  margin-bottom: 0.5rem;
}

.error-section h1 {
  font-size: 2rem;
  margin-bottom: 0.75rem;
}

.error-section > p {
  color: var(--color-text-muted);
  max-width: 480px;
  margin: 0 auto 1.5rem;
}

.error-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
  margin-top: 24px;
}

.error-links a {
  color: var(--color-link);
  font-weight: 600;
  text-decoration: underline;
  padding: 4px 8px;
}

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

/* ------------------------------------------------------------
   5. Responsive — 响应式适配
   ------------------------------------------------------------ */

/* 平板以下 */
@media (max-width: 992px) {
  :root {
    --container-pad: 20px;
  }

  h1 {
    font-size: 2rem;
  }

  h2 {
    font-size: 1.5rem;
  }

  /* 首页 */
  .hero-section {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 32px 0 24px;
  }

  .hero-media {
    order: -1;
  }

  .hero-media img {
    aspect-ratio: 16 / 9;
  }

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

  .anchor-nav li:nth-child(2) {
    border-right: none;
  }

  .anchor-nav li:nth-child(-n+2) {
    border-bottom: 1px solid var(--color-gray);
  }

  .scenario-card-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
  }

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

  /* 内页 */
  .page-layout {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .content-sidebar {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
  }

  .tag-section,
  .service-recommend {
    margin-bottom: 0;
  }

  .capability-block {
    grid-template-columns: 180px minmax(0, 1fr);
    gap: 16px;
  }

  .scenario-item {
    grid-template-columns: 220px minmax(0, 1fr);
    gap: 16px;
  }

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

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

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

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

  .contact-action {
    flex-direction: row;
  }

  .contact-action .btn-primary,
  .contact-action .btn-secondary {
    width: auto;
  }

  .faq-link-list {
    grid-template-columns: 1fr;
  }

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

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

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

  .sidebar {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
  }

  .sidebar-card {
    margin-bottom: 0;
  }

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

/* 手机端 */
@media (max-width: 768px) {
  :root {
    --container-pad: 16px;
    --header-h: 60px;
  }

  h1 {
    font-size: 1.75rem;
  }

  h2 {
    font-size: 1.375rem;
  }

  h3 {
    font-size: 1.125rem;
  }

  /* 页头导航 */
  .nav-toggle {
    display: flex;
    order: 2;
  }

  .site-nav {
    position: absolute;
    top: var(--header-h);
    left: 0;
    right: 0;
    background-color: var(--color-ink);
    border-top: 1px solid rgba(255, 255, 255, 0.12);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px 0 12px;
    max-height: calc(100vh - var(--header-h));
    overflow-y: auto;
  }

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

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

  .nav-list a {
    padding: 14px 24px;
    border-radius: 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  }

  .nav-list a.is-current {
    border-bottom-color: var(--color-accent);
    background-color: rgba(252, 163, 17, 0.12);
  }

  /* 面包屑 */
  .breadcrumb {
    padding: 12px 0;
    font-size: 0.8125rem;
  }

  /* 页面标题 */
  .page-header {
    padding: 24px 16px;
    margin-bottom: 24px;
  }

  .page-title {
    font-size: 1.5rem;
  }

  .page-description {
    font-size: 1rem;
  }

  .inner-main,
  .home-main,
  .error-main {
    padding: 0 16px 32px;
  }

  /* 首页 */
  .hero-section {
    padding: 24px 0 16px;
    gap: 16px;
  }

  .hero-title {
    font-size: 1.75rem;
  }

  .hero-lead {
    font-size: 1rem;
  }

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

  .daily-focus {
    padding: 20px;
  }

  .anchor-nav ul {
    grid-template-columns: 1fr 1fr;
  }

  .anchor-nav a {
    padding: 12px 12px;
    font-size: 0.875rem;
  }

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

  .service-category-list {
    padding: 16px;
  }

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

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

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

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

  /* 行业观察 */
  .category-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .article-item {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .article-media img {
    aspect-ratio: 16 / 9;
  }

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

  /* 服务能力 */
  .table-wrap {
    overflow-x: auto;
  }

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

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

  .capability-media img {
    aspect-ratio: 16 / 9;
  }

  .workflow-steps {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  /* 业务场景 */
  .scenario-item {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .scenario-media img {
    aspect-ratio: 16 / 9;
  }

  .consult-entry {
    padding: 24px;
  }

  /* 合作流程 */
  .tabs-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .stage-head {
    flex-wrap: wrap;
  }

  .stage-content {
    grid-template-columns: 1fr;
  }

  .contact-card {
    padding: 24px;
  }

  .contact-action {
    flex-direction: column;
  }

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

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

  .faq-link-list {
    grid-template-columns: 1fr;
  }

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

  /* 常见问题 */
  .faq-cat-image {
    aspect-ratio: 16 / 5;
  }

  .faq-item summary {
    padding: 14px 40px 14px 16px;
    font-size: 0.9375rem;
  }

  .faq-answer {
    padding: 12px 16px 14px;
  }

  /* 关于我们 */
  .role-list {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .project-type-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .principles-list li {
    padding: 14px 16px 14px 48px;
  }

  .principles-list li::before {
    left: 12px;
    width: 24px;
    height: 24px;
    line-height: 24px;
    font-size: 0.75rem;
  }

  .contact-steps {
    grid-template-columns: 1fr;
    gap: 12px;
  }

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

  .sidebar-card {
    margin-bottom: 0;
  }

  /* 页脚 */
  .footer-columns {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 32px 16px 24px;
  }

  .footer-bottom {
    padding: 16px;
  }

  .footer-bottom p {
    font-size: 0.8125rem;
  }

  /* 404 */
  .error-section {
    padding: 48px 16px 40px;
  }

  .error-code {
    font-size: 3.5rem;
  }

  /* 相关链接 */
  .related-links {
    padding: 20px 16px;
  }

  .related-links ul {
    flex-direction: column;
    gap: 4px;
  }
}

/* 小屏手机 */
@media (max-width: 390px) {
  :root {
    --container-pad: 12px;
  }

  .brand-logo {
    font-size: 1.25rem;
  }

  .nav-list a {
    padding: 12px 16px;
  }

  .hero-title {
    font-size: 1.5rem;
  }

  .btn-primary,
  .btn-secondary {
    padding: 10px 20px;
    font-size: 0.9375rem;
  }

  .anchor-nav a {
    padding: 10px 8px;
    font-size: 0.8125rem;
  }

  .anchor-nav ul {
    grid-template-columns: 1fr 1fr;
  }

  .process-step {
    padding: 16px;
  }

  .page-header {
    padding: 20px 12px;
  }

  .page-title {
    font-size: 1.375rem;
  }

  .section-title {
    font-size: 1.25rem;
  }
}