/* ============================================================
   51吃瓜今日大瓜 · 整站样式表
   视觉方向：摄影档案风 — 灰白画布、统一缩略图、元数据编号、沉静节奏
   ============================================================ */

/* ============================================================
   Base — 全局基础
   ============================================================ */
:root {
  --canvas: #f5f5f2;
  --ink: #1c1c1a;
  --meta: #6b6b66;
  --archive: #9a8a70;
  --line: #d0c7b8;
  --card-bg: #ffffff;
  --header-bg: rgba(255, 255, 255, 0.96);
  --shadow-soft: 0 1px 3px rgba(28, 28, 26, 0.06), 0 4px 14px rgba(28, 28, 26, 0.04);
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 8px;
  --container: 1200px;
  --content-max: 820px;
  --sidebar-width: 300px;
  --space-section: 72px;
  --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
}

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

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

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

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

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

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

ul,
ol {
  list-style: none;
}

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

p {
  max-width: 680px;
}

/* ============================================================
   Layout — 全站统一骨架
   ============================================================ */

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

.header-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px 24px;
  min-height: 68px;
}

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

.brand-name {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--ink);
}

.brand-tag {
  font-size: 12px;
  color: var(--meta);
  letter-spacing: 0.04em;
}

/* --- 主导航 --- */
.main-nav {
  margin-left: auto;
}

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

.main-nav li a {
  display: block;
  padding: 8px 14px;
  font-size: 15px;
  color: var(--ink);
  border-radius: var(--radius-sm);
  line-height: 1.4;
}

.main-nav li a:hover {
  background: rgba(154, 138, 112, 0.1);
  color: var(--archive);
}

.main-nav li a.is-current {
  color: var(--archive);
  font-weight: 600;
  background: rgba(154, 138, 112, 0.08);
}

/* --- 文档版本条 --- */
.doc-version-bar {
  flex-basis: 100%;
  border-top: 1px solid var(--line);
  padding: 6px 0;
  display: flex;
  align-items: center;
}

.doc-version-bar a {
  font-size: 12px;
  color: var(--meta);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.doc-version-bar a::before {
  content: "";
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--archive);
}

.doc-version-bar a:hover {
  color: var(--archive);
}

/* --- 主容器 --- */
.site-main {
  min-height: 60vh;
}

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

/* --- 面包屑 --- */
.breadcrumb {
  padding: 20px 0 4px;
  font-size: 13px;
  color: var(--meta);
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
}

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

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

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

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

/* 内页 services.html 中面包屑在 main-content 内 */
.main-content .breadcrumb {
  padding-top: 0;
}

/* --- 页标题区 --- */
.page-header {
  padding: 24px 0 8px;
}

.page-title {
  font-size: 34px;
  font-weight: 700;
  line-height: 1.3;
  color: var(--ink);
  letter-spacing: 0;
}

.page-title-area {
  padding: 8px 0 32px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 40px;
}

.page-subtitle,
.page-title-desc,
.page-intro {
  font-size: 16px;
  color: var(--meta);
  max-width: 680px;
  line-height: 1.7;
}

/* --- 页脚 --- */
.site-footer {
  background: #1c1c1a;
  color: rgba(255, 255, 255, 0.82);
  margin-top: 80px;
}

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

.footer-brand-name {
  font-size: 18px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 10px;
}

.footer-brand-desc {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.65);
  max-width: 340px;
}

.footer-col h3 {
  font-size: 14px;
  font-weight: 600;
  color: #fff;
  margin-bottom: 14px;
  letter-spacing: 0.03em;
}

.footer-col ul li {
  margin-bottom: 8px;
}

.footer-col ul li a {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.65);
}

.footer-col ul li a:hover {
  color: var(--archive);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding: 20px 24px;
  text-align: center;
}

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

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

/* --- 按钮 --- */
.btn-primary,
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease;
  min-height: 44px;
}

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

.btn-primary:hover {
  background: #33332f;
  border-color: #33332f;
  color: #fff;
}

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

.btn-secondary:hover {
  border-color: var(--archive);
  color: var(--archive);
  background: rgba(154, 138, 112, 0.06);
}

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

.section-heading h2 {
  font-size: 26px;
  font-weight: 700;
  margin-bottom: 8px;
}

.section-heading p {
  font-size: 15px;
  color: var(--meta);
  max-width: 680px;
}

/* --- 图片 --- */
figure {
  overflow: hidden;
  background: #e8e6df;
}

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

/* --- 服务编号 --- */
.service-no {
  font-size: 12px;
  font-weight: 600;
  color: var(--archive);
  letter-spacing: 0.08em;
  font-family: "SF Mono", "Consolas", monospace;
}

/* --- 通用卡片 --- */
.service-card,
.step-item,
.sidebar-card,
.sidebar-block,
.doc-card,
.category-card,
.support-link-card,
.related-link-card,
.comparison-card {
  background: var(--card-bg);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
}

/* --- 相关链接 --- */
.related-links {
  max-width: var(--container);
  margin: 56px auto 0;
  padding: 24px 24px 0;
  border-top: 1px solid var(--line);
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px 20px;
}

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

.related-links-item {
  font-size: 14px;
  color: var(--ink);
}

.related-links-item:hover {
  color: var(--archive);
}

.related-links-item::after {
  content: "→";
  margin-left: 4px;
  color: var(--archive);
}

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

.faq-item summary {
  padding: 18px 22px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  transition: color 0.2s ease;
}

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

.faq-item summary::after {
  content: "+";
  font-size: 22px;
  font-weight: 400;
  color: var(--archive);
  flex-shrink: 0;
  line-height: 1;
}

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

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

.faq-item p,
.faq-answer p {
  padding: 16px 22px;
  font-size: 15px;
  color: var(--meta);
  line-height: 1.7;
  max-width: none;
}

.faq-list .faq-item p {
  padding: 0 22px 18px;
  font-size: 15px;
  color: var(--meta);
}

/* --- 侧栏 --- */
.sidebar {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.sidebar-card,
.sidebar-block {
  padding: 24px;
}

.sidebar-card h2,
.sidebar-block h2 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

.sidebar-links li,
.sidebar-nav li {
  margin-bottom: 4px;
}

.sidebar-links a,
.sidebar-nav a {
  display: block;
  padding: 8px 10px;
  font-size: 14px;
  border-radius: var(--radius-sm);
  color: var(--ink);
}

.sidebar-links a:hover,
.sidebar-nav a:hover {
  background: rgba(154, 138, 112, 0.08);
  color: var(--archive);
}

.sidebar-note {
  font-size: 13px;
  color: var(--meta);
  line-height: 1.6;
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

/* 文档中心侧栏版本 */
.sidebar-version {
  background: var(--card-bg);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 24px;
}

.sidebar-version h2 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 12px;
}

.sidebar-version-desc {
  font-size: 13px;
  color: var(--meta);
  line-height: 1.6;
}

/* --- 内容区媒体 --- */
.content-media {
  margin: 32px 0;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
}

.content-media img {
  height: 260px;
}

.content-media figcaption {
  padding: 12px 20px;
  font-size: 13px;
  color: var(--meta);
  background: var(--card-bg);
  border-top: 1px solid var(--line);
}

/* ============================================================
   Components — 首页专属
   ============================================================ */

/* --- Hero 双通道 --- */
.hero-section {
  background: var(--canvas);
  padding: 64px 0 56px;
}

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

.hero-intro h1 {
  font-size: 38px;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 18px;
  max-width: 560px;
}

.hero-lead {
  font-size: 17px;
  color: var(--meta);
  line-height: 1.75;
  margin-bottom: 28px;
  max-width: 520px;
}

.hero-quick-links {
  background: var(--card-bg);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 28px;
}

.hero-quick-links h2 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 18px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

.hero-quick-links ul li {
  margin-bottom: 4px;
}

.hero-quick-links ul li a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 10px;
  font-size: 15px;
  border-radius: var(--radius-sm);
  border-bottom: 1px solid rgba(208, 199, 184, 0.4);
}

.hero-quick-links ul li a::after {
  content: "→";
  color: var(--archive);
  font-size: 14px;
}

.hero-quick-links ul li a:hover {
  background: rgba(154, 138, 112, 0.08);
  color: var(--archive);
}

.hero-quick-links ul li:last-child a {
  border-bottom: none;
}

.hero-visual {
  grid-column: 1 / -1;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  height: 320px;
}

.hero-visual img {
  height: 320px;
}

/* --- 品牌定位短述 --- */
.brand-intro {
  padding: 72px 0;
  border-top: 1px solid var(--line);
}

.brand-intro-layout {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 56px;
  align-items: center;
}

.brand-intro-text h2 {
  font-size: 26px;
  font-weight: 700;
  margin-bottom: 16px;
}

.brand-intro-text p {
  font-size: 16px;
  color: var(--meta);
  line-height: 1.75;
  margin-bottom: 14px;
}

.brand-intro-figure {
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  height: 260px;
}

.brand-intro-figure img {
  height: 260px;
}

/* --- 服务矩阵网格 --- */
.services-overview {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px 72px;
}

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

.service-card {
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: box-shadow 0.25s ease, transform 0.25s ease;
}

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

.service-card figure {
  height: 160px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
}

.service-card figure img {
  height: 160px;
}

.service-card h3 {
  font-size: 17px;
  font-weight: 700;
}

.service-card p {
  font-size: 14px;
  color: var(--meta);
  line-height: 1.65;
  flex-grow: 1;
}

.service-card a {
  font-size: 14px;
  font-weight: 500;
  color: var(--archive);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.service-card a::after {
  content: "→";
  font-size: 13px;
}

/* --- 合作流程预览 --- */
.process-preview {
  padding: 72px 0;
  border-top: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.4);
}

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

.process-steps {
  max-width: var(--container);
  margin: 0 auto 40px;
  padding: 0 24px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.step-item {
  padding: 24px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}

.step-no {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--ink);
  color: #fff;
  font-size: 16px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: "SF Mono", "Consolas", monospace;
}

.step-item h3 {
  font-size: 16px;
  font-weight: 700;
}

.step-item p {
  font-size: 14px;
  color: var(--meta);
  line-height: 1.6;
  max-width: none;
}

.process-preview .btn-secondary {
  display: inline-flex;
  margin: 0 auto;
}

/* --- 服务支持概览 --- */
.support-overview {
  max-width: var(--container);
  margin: 0 auto;
  padding: 72px 24px;
}

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

.support-policy,
.support-categories {
  background: var(--card-bg);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 32px;
}

.support-policy h2,
.support-categories h2 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 14px;
}

.support-policy p {
  font-size: 15px;
  color: var(--meta);
  line-height: 1.7;
  margin-bottom: 20px;
}

.support-policy a {
  font-size: 14px;
  font-weight: 500;
  color: var(--archive);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.support-policy a::after {
  content: "→";
}

.support-categories ul {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.support-categories ul li a {
  display: block;
  padding: 10px 14px;
  font-size: 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  transition: border-color 0.2s ease, color 0.2s ease;
}

.support-categories ul li a:hover {
  border-color: var(--archive);
  color: var(--archive);
}

/* --- FAQ 摘要 --- */
.faq-preview {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px 72px;
}

.faq-preview .faq-list {
  margin-bottom: 32px;
}

/* --- 合作咨询说明 --- */
.cta-section {
  background: var(--ink);
  color: #fff;
  padding: 72px 24px;
  text-align: center;
}

.cta-section h2 {
  font-size: 28px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 14px;
}

.cta-section p {
  font-size: 16px;
  color: rgba(255, 255, 255, 0.75);
  max-width: 560px;
  margin: 0 auto 12px;
}

.cta-section a {
  display: inline-flex;
  margin-top: 20px;
  background: #fff;
  color: var(--ink);
  border: 1px solid #fff;
}

.cta-section a:hover {
  background: rgba(255, 255, 255, 0.88);
  color: var(--ink);
}

/* ============================================================
   Pages — 关于我们
   ============================================================ */

/* --- 品牌故事 --- */
.brand-story {
  padding: 0 0 56px;
}

.story-content {
  margin-bottom: 40px;
}

.story-content h2 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 16px;
}

.story-content p {
  font-size: 16px;
  color: var(--meta);
  line-height: 1.75;
  margin-bottom: 14px;
}

.story-media {
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  height: 300px;
}

.story-media img {
  height: 300px;
}

.story-media figcaption {
  padding: 12px 20px;
  font-size: 13px;
  color: var(--meta);
  background: var(--card-bg);
  border-top: 1px solid var(--line);
}

/* --- 服务理念 --- */
.philosophy {
  padding: 56px 0;
  border-top: 1px solid var(--line);
}

.philosophy > h2 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 24px;
}

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

.philosophy-list li {
  background: var(--card-bg);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 28px;
}

.philosophy-list h3 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--archive);
}

.philosophy-list p {
  font-size: 15px;
  color: var(--meta);
  line-height: 1.7;
}

/* --- 工作方法 --- */
.method {
  padding: 56px 0;
  border-top: 1px solid var(--line);
}

.method > h2 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 24px;
}

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

.method-item {
  padding: 24px;
  background: var(--card-bg);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
}

.method-item h3 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.method-item h3::before {
  content: "";
  width: 6px;
  height: 6px;
  background: var(--archive);
  border-radius: 50%;
  flex-shrink: 0;
}

.method-item p {
  font-size: 14px;
  color: var(--meta);
  line-height: 1.65;
}

/* --- 能力边界 --- */
.boundary {
  padding: 56px 0;
  border-top: 1px solid var(--line);
}

.boundary > h2 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 14px;
}

.boundary-intro {
  font-size: 16px;
  color: var(--meta);
  margin-bottom: 24px;
}

.boundary-list {
  max-width: 720px;
}

.boundary-list li {
  padding: 12px 0 12px 24px;
  font-size: 15px;
  color: var(--ink);
  border-bottom: 1px solid var(--line);
  position: relative;
}

.boundary-list li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--archive);
}

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

/* --- 关于页相关链接 --- */
.related-link-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.related-link-card {
  padding: 24px;
  transition: box-shadow 0.25s ease;
}

.related-link-card:hover {
  box-shadow: var(--shadow-soft);
}

.related-link-card h3 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 8px;
}

.related-link-card p {
  font-size: 14px;
  color: var(--meta);
  line-height: 1.6;
}

/* ============================================================
   Pages — 服务介绍
   ============================================================ */

.layout-shell {
  display: grid;
  grid-template-columns: 1fr var(--sidebar-width);
  gap: 48px;
  align-items: start;
  padding: 0 0 56px;
}

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

/* --- 服务列表 --- */
.service-list {
  margin-bottom: 64px;
}

.service-list h2 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 8px;
}

.section-intro {
  font-size: 15px;
  color: var(--meta);
  margin-bottom: 32px;
  max-width: 680px;
}

.service-item {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 28px;
  padding: 28px 0;
  border-bottom: 1px solid var(--line);
  align-items: start;
}

.service-item:first-of-type {
  border-top: 1px solid var(--line);
}

.service-item-media figure {
  height: 150px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
}

.service-item-media figure img {
  height: 150px;
}

.service-item-content {
  min-width: 0;
}

.service-item-header {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 8px;
}

.service-item-header h3 {
  font-size: 20px;
  font-weight: 700;
}

.service-item-desc {
  font-size: 15px;
  color: var(--meta);
  line-height: 1.7;
  margin-bottom: 14px;
}

.service-item-meta {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px 24px;
  margin-bottom: 14px;
  font-size: 14px;
}

.service-item-meta dt {
  color: var(--archive);
  font-weight: 600;
  display: inline;
}

.service-item-meta dd {
  color: var(--meta);
  display: inline;
  margin-left: 4px;
}

.service-item-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--archive);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.service-item-link::after {
  content: "→";
}

/* --- 服务方案对比表 --- */
.service-comparison {
  margin-bottom: 64px;
}

.service-comparison h2 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 8px;
}

.comparison-table-wrap {
  overflow-x: auto;
  background: var(--card-bg);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
}

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

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

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

.comparison-table tbody th {
  font-weight: 600;
  color: var(--archive);
  white-space: nowrap;
  background: rgba(245, 245, 242, 0.7);
}

.comparison-table tbody td {
  color: var(--meta);
  line-height: 1.6;
}

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

/* 小屏对比卡片 */
.comparison-cards {
  display: none;
}

.comparison-card {
  padding: 20px;
}

.comparison-card h3 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

.comparison-card dl {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
}

.comparison-card dt {
  font-weight: 600;
  color: var(--archive);
  font-size: 14px;
}

.comparison-card dd {
  font-size: 14px;
  color: var(--meta);
}

/* --- 交付标准 --- */
.delivery-standard {
  margin-bottom: 40px;
}

.delivery-standard h2 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 8px;
}

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

.standard-item {
  background: var(--card-bg);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 24px;
}

.standard-item h3 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--archive);
}

.standard-item p {
  font-size: 14px;
  color: var(--meta);
  line-height: 1.65;
}

/* ============================================================
   Pages — 合作流程
   ============================================================ */

/* --- 时间线 --- */
.process-timeline {
  margin-bottom: 64px;
}

.timeline-wrap {
  position: relative;
  padding-left: 48px;
}

.timeline-wrap::before {
  content: "";
  position: absolute;
  left: 19px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: var(--line);
}

.timeline-item {
  position: relative;
  margin-bottom: 32px;
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 24px;
  align-items: start;
}

.timeline-meta {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.step-num {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--ink);
  color: #fff;
  font-size: 15px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  z-index: 1;
  font-family: "SF Mono", "Consolas", monospace;
}

.timeline-meta img {
  width: 100%;
  height: 90px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  object-fit: cover;
}

.timeline-body {
  background: var(--card-bg);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 24px 28px;
}

.timeline-body h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
}

.timeline-body p {
  font-size: 14px;
  color: var(--meta);
  margin-bottom: 12px;
  line-height: 1.65;
}

.timeline-body ul {
  display: grid;
  gap: 6px;
}

.timeline-body ul li {
  font-size: 14px;
  color: var(--ink);
  padding-left: 18px;
  position: relative;
  line-height: 1.6;
}

.timeline-body ul li::before {
  content: "·";
  position: absolute;
  left: 4px;
  color: var(--archive);
  font-weight: 700;
}

/* --- 双方配合事项 --- */
.cooperation-notes {
  margin-bottom: 64px;
}

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

.notes-col {
  background: var(--card-bg);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 28px;
}

.notes-col h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

.notes-col ul {
  display: grid;
  gap: 10px;
}

.notes-col ul li {
  font-size: 14px;
  color: var(--meta);
  padding-left: 18px;
  position: relative;
  line-height: 1.6;
}

.notes-col ul li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--archive);
}

/* --- 交付与验收 --- */
.handoff-standard {
  margin-bottom: 40px;
}

/* --- 流程页相关链接 --- */
.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.related-grid a {
  display: block;
  background: var(--card-bg);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 24px;
  font-size: 15px;
  font-weight: 600;
  transition: box-shadow 0.25s ease, border-color 0.25s ease;
}

.related-grid a:hover {
  border-color: var(--archive);
  box-shadow: var(--shadow-soft);
}

.related-grid a::after {
  content: "→";
  margin-left: 6px;
  color: var(--archive);
}

/* ============================================================
   Pages — 服务支持
   ============================================================ */

.page-container {
  padding-bottom: 56px;
}

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

.main-article section {
  margin-bottom: 56px;
}

.main-article section h2 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 8px;
}

.section-desc {
  font-size: 15px;
  color: var(--meta);
  margin-bottom: 24px;
  max-width: 680px;
}

/* --- 服务政策 --- */
.policy-list {
  display: grid;
  gap: 14px;
}

.policy-item {
  background: var(--card-bg);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  font-size: 15px;
  line-height: 1.7;
  position: relative;
}

.policy-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--archive);
  border-radius: var(--radius-sm) 0 0 var(--radius-sm);
}

/* --- 问题分类 --- */
.category-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.category-card {
  padding: 24px 20px;
  text-align: center;
  transition: box-shadow 0.25s ease;
}

.category-card:hover {
  box-shadow: var(--shadow-soft);
}

.category-card h3 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 8px;
}

.category-card p {
  font-size: 13px;
  color: var(--meta);
  line-height: 1.6;
}

/* --- 问题处理流程 --- */
.process-list {
  counter-reset: process;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.process-step {
  background: var(--card-bg);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 20px;
  position: relative;
  counter-increment: process;
}

.process-step::before {
  content: counter(process, decimal-leading-zero);
  font-size: 13px;
  font-weight: 600;
  color: var(--archive);
  font-family: "SF Mono", "Consolas", monospace;
  display: block;
  margin-bottom: 8px;
}

.process-step strong {
  display: block;
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 6px;
}

.process-step span {
  font-size: 13px;
  color: var(--meta);
  line-height: 1.6;
}

/* --- 资料下载 --- */
.download-list {
  display: grid;
  gap: 12px;
}

.download-item {
  background: var(--card-bg);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 18px 22px;
  display: flex;
  align-items: center;
  gap: 16px;
}

.doc-id {
  font-size: 12px;
  font-weight: 600;
  color: var(--archive);
  font-family: "SF Mono", "Consolas", monospace;
  flex-shrink: 0;
  width: 44px;
}

.doc-info {
  flex: 1;
  min-width: 0;
}

.doc-info strong {
  display: block;
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 2px;
}

.doc-info span {
  font-size: 13px;
  color: var(--meta);
}

.version-tag {
  font-size: 12px;
  color: var(--archive);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 3px 8px;
  flex-shrink: 0;
}

.download-note {
  margin-top: 16px;
  font-size: 13px;
  color: var(--meta);
  background: rgba(154, 138, 112, 0.08);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
}

/* --- 进度说明 --- */
.progress-content {
  display: grid;
  gap: 16px;
}

.progress-content p {
  font-size: 15px;
  color: var(--meta);
  line-height: 1.7;
}

/* --- 支持页底部链接 --- */
.support-links-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.support-link-card {
  padding: 20px;
  font-size: 15px;
  font-weight: 600;
  transition: box-shadow 0.25s ease;
}

.support-link-card:hover {
  box-shadow: var(--shadow-soft);
}

.support-link-card::after {
  content: "→";
  margin-left: 4px;
  color: var(--archive);
}

/* --- 支持页侧栏 --- */
.sidebar-block ul li {
  margin-bottom: 4px;
}

.sidebar-block ul li a {
  display: block;
  padding: 8px 10px;
  font-size: 14px;
  border-radius: var(--radius-sm);
}

.sidebar-block ul li a:hover {
  background: rgba(154, 138, 112, 0.08);
  color: var(--archive);
}

.version-note {
  font-size: 13px;
  color: var(--meta);
  line-height: 1.6;
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--line);
}

/* ============================================================
   Pages — 文档中心
   ============================================================ */

.page-layout {
  display: grid;
  grid-template-columns: 1fr var(--sidebar-width);
  gap: 48px;
  align-items: start;
  padding-bottom: 56px;
}

/* --- 版本提示 --- */
.doc-version-notice {
  background: var(--card-bg);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 24px 28px;
  margin-bottom: 48px;
  display: flex;
  align-items: flex-start;
  gap: 16px;
}

.doc-version-notice h2 {
  font-size: 16px;
  font-weight: 700;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: 8px;
}

.doc-version-notice h2::before {
  content: "v1.0";
  font-size: 12px;
  color: var(--archive);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 2px 8px;
  font-weight: 600;
}

.doc-version-notice p {
  font-size: 14px;
  color: var(--meta);
  line-height: 1.7;
  max-width: none;
}

.doc-version-notice strong {
  color: var(--ink);
  font-weight: 600;
}

/* --- 文档列表 --- */
.doc-list-section h2 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 24px;
}

.doc-category {
  margin-bottom: 40px;
}

.doc-category h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

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

.doc-card {
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: box-shadow 0.25s ease;
}

.doc-card:hover {
  box-shadow: var(--shadow-soft);
}

.doc-num {
  font-size: 12px;
  font-weight: 600;
  color: var(--archive);
  font-family: "SF Mono", "Consolas", monospace;
}

.doc-name {
  font-size: 15px;
  font-weight: 600;
  line-height: 1.5;
}

.doc-desc {
  font-size: 13px;
  color: var(--meta);
  line-height: 1.6;
}

.doc-version-tag {
  align-self: flex-start;
  font-size: 12px;
  color: var(--archive);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 2px 8px;
  margin-top: 4px;
}

.doc-cover {
  height: 120px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  margin-bottom: 4px;
}

.doc-cover img {
  height: 120px;
}

/* --- 获取文档方式 --- */
.doc-access {
  margin-top: 24px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}

.doc-access h2 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 12px;
}

.doc-access p {
  font-size: 14px;
  color: var(--meta);
  line-height: 1.7;
  margin-bottom: 8px;
}

/* ============================================================
   Pages — 常见问题
   ============================================================ */

.page-title-block {
  margin-bottom: 40px;
}

.page-title-block .page-intro {
  margin-bottom: 24px;
}

.faq-groups {
  display: grid;
  gap: 48px;
  margin-bottom: 56px;
}

.faq-group h2 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 20px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

.faq-group .faq-item:last-child {
  margin-bottom: 0;
}

.faq-answer p {
  padding: 0 22px 18px;
}

/* --- FAQ 底部链接 --- */
.support-links h2 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 8px;
}

.support-links > p {
  font-size: 15px;
  color: var(--meta);
  margin-bottom: 20px;
}

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

.support-link-list li a {
  display: block;
  background: var(--card-bg);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  font-size: 15px;
  font-weight: 500;
  text-align: center;
  transition: border-color 0.25s ease, box-shadow 0.25s ease;
}

.support-link-list li a:hover {
  border-color: var(--archive);
  box-shadow: var(--shadow-soft);
}

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

.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  padding: 48px 24px;
}

.error-section {
  text-align: center;
  max-width: 520px;
  margin: 0 auto;
}

.error-code {
  font-size: 72px;
  font-weight: 700;
  color: var(--archive);
  line-height: 1;
  font-family: "SF Mono", "Consolas", monospace;
  margin-bottom: 16px;
}

.error-section h1 {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 14px;
}

.error-desc {
  font-size: 16px;
  color: var(--meta);
  margin-bottom: 28px;
  margin-left: auto;
  margin-right: auto;
}

.error-btn {
  display: inline-flex;
  margin-bottom: 32px;
}

.error-tip {
  font-size: 14px;
  color: var(--meta);
}

.error-tip a {
  color: var(--archive);
  margin: 0 4px;
}

.error-tip a:hover {
  text-decoration: underline;
}

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

/* --- 移动端导航 --- */
.nav-toggle {
  display: none;
}

/* --- 1200px --- */
@media (max-width: 1200px) {
  .services-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* --- 1024px --- */
@media (max-width: 1024px) {
  .layout-shell,
  .page-layout {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .sidebar {
    order: 2;
  }

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

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

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

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

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

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

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

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

/* --- 900px --- */
@media (max-width: 900px) {
  .hero-layout {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .hero-visual {
    order: 3;
  }

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

  .brand-intro-figure {
    order: 2;
  }

  .support-layout {
    grid-template-columns: 1fr;
  }

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

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

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

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

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

  .footer-brand {
    grid-column: 1 / -1;
  }
}

/* --- 768px 手机导航 --- */
@media (max-width: 768px) {
  .header-inner {
    padding: 0 16px;
    gap: 8px;
  }

  .main-nav {
    order: 3;
    flex-basis: 100%;
    margin-left: 0;
  }

  .main-nav ul {
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding: 8px 0 16px;
  }

  .main-nav ul.is-open {
    display: flex;
  }

  .main-nav li a {
    padding: 14px 12px;
    border-bottom: 1px solid var(--line);
    border-radius: 0;
  }

  .main-nav li:last-child a {
    border-bottom: none;
  }

  .nav-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    background: none;
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
    font-size: 20px;
    color: var(--ink);
    cursor: pointer;
    margin-left: auto;
    line-height: 1;
  }

  .nav-toggle[aria-expanded="true"] {
    color: var(--archive);
    border-color: var(--archive);
  }

  .doc-version-bar {
    padding: 6px 0;
  }

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

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

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

  .hero-section {
    padding: 40px 0;
  }

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

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

  .process-steps {
    grid-template-columns: 1fr;
  }

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

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

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

  .service-item-media figure {
    height: 180px;
  }

  .service-item-media figure img {
    height: 180px;
  }

  .comparison-table-wrap {
    display: none;
  }

  .comparison-cards {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .timeline-wrap {
    padding-left: 0;
  }

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

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

  .timeline-meta {
    flex-direction: row;
    align-items: center;
    gap: 12px;
  }

  .timeline-meta img {
    width: 120px;
    height: 70px;
    flex-shrink: 0;
  }

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

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

  .support-links-grid {
    grid-template-columns: 1fr;
  }

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

  .related-link-grid,
  .related-grid {
    grid-template-columns: 1fr;
  }

  .support-categories ul {
    grid-template-columns: 1fr;
  }

  .cta-section {
    padding: 48px 16px;
  }

  .cta-section h2 {
    font-size: 24px;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 40px 16px 24px;
  }

  .footer-brand {
    grid-column: 1;
  }

  .footer-bottom {
    padding: 16px;
  }

  .related-links {
    padding: 20px 16px 0;
  }

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

  .story-media {
    height: 240px;
  }

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

  .doc-version-notice {
    flex-direction: column;
    gap: 8px;
  }

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

/* --- 390px --- */
@media (max-width: 390px) {
  .brand-name {
    font-size: 18px;
  }

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

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

  .hero-lead {
    font-size: 15px;
  }

  .hero-quick-links {
    padding: 20px;
  }

  .services-grid {
    gap: 16px;
  }

  .service-card {
    padding: 20px;
  }

  .service-card figure {
    height: 140px;
  }

  .service-card figure img {
    height: 140px;
  }

  .step-item {
    padding: 20px;
  }

  .support-policy,
  .support-categories {
    padding: 24px 20px;
  }

  .policy-item {
    padding: 16px 18px;
  }

  .download-item {
    flex-wrap: wrap;
    gap: 8px;
  }

  .doc-info {
    flex-basis: 100%;
  }

  .timeline-body {
    padding: 20px;
  }

  .notes-col {
    padding: 20px;
  }

  .standard-item {
    padding: 20px;
  }

  .service-item {
    padding: 20px 0;
  }

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

  .footer-col ul li a {
    font-size: 15px;
    padding: 2px 0;
  }
}

/* --- 动效增强（不阻塞初始可见性） --- */
@media (prefers-reduced-motion: no-preference) {
  .service-card,
  .step-item,
  .method-item,
  .standard-item,
  .category-card,
  .doc-card,
  .related-link-card,
  .support-link-card {
    transition: box-shadow 0.25s ease, transform 0.25s ease, border-color 0.25s ease;
  }

  .service-card:hover,
  .method-item:hover,
  .standard-item:hover,
  .category-card:hover,
  .doc-card:hover,
  .related-link-card:hover,
  .support-link-card:hover {
    transform: translateY(-2px);
  }
}