/* ============================================================
   911吃瓜爆料 · 整站样式表
   工艺品牌风：暖灰底 / 墨黑字 / 陶土橙点缀
   ============================================================ */

/* ============================================================
   Base — 基础变量、重置与全局排版
   ============================================================ */
:root {
  --color-bg: #F5F1EA;
  --color-text: #2B2B28;
  --color-accent: #A8512B;
  --color-muted: #8A8F87;
  --color-card: #FFFFFF;
  --color-line: #E3DDD2;
  --color-line-dark: #C9C2B6;
  --color-bg-soft: #EFEAE1;
  --color-text-light: #6E736B;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", SFMono-Regular, Consolas, "Liberation Mono", Menlo,
    monospace;

  --container-width: 1200px;
  --content-width: 960px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 8px;

  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;

  --shadow-card: 0 1px 3px rgba(43, 43, 40, 0.06);
  --shadow-card-hover: 0 4px 12px rgba(43, 43, 40, 0.1);

  --header-height: 72px;
}

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

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

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

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

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

a:hover {
  color: #8A3F1F;
}

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-text);
}

h1 {
  font-size: 32px;
}

h2 {
  font-size: 24px;
}

h3 {
  font-size: 18px;
  font-weight: 600;
}

p {
  line-height: 1.75;
}

/* 数字与编号使用等宽字体 */
.field-num,
.step-num,
.step-number,
.section-number,
.item-number,
.error-code {
  font-family: var(--font-mono);
  font-feature-settings: "tnum";
}

/* ============================================================
   Layout — 全局容器、页头、页脚、面包屑
   ============================================================ */
.site-body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

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

.brand a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  color: var(--color-text);
}

.brand-name {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: 0.01em;
}

.brand-tagline {
  font-size: 13px;
  color: var(--color-muted);
  letter-spacing: 0.02em;
}

/* 主导航（桌面端） */
.main-nav.site-nav {
  display: block;
}

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

.nav-list li a {
  display: block;
  padding: 8px 14px;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text);
  border-radius: var(--radius-sm);
  transition: background-color 0.2s ease, color 0.2s ease;
}

.nav-list li a:hover {
  background-color: var(--color-bg-soft);
  color: var(--color-accent);
}

.nav-list li a.is-current {
  color: var(--color-accent);
  background-color: rgba(168, 81, 43, 0.08);
  font-weight: 600;
}

.nav-cta {
  display: inline-block;
  padding: 8px 20px;
  background-color: var(--color-accent);
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: background-color 0.2s ease;
  white-space: nowrap;
}

.nav-cta:hover {
  background-color: #8A3F1F;
  color: #fff;
}

/* 汉堡按钮（移动端显示） */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  background: none;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.toggle-bar {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-text);
  border-radius: 1px;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

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

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

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

/* 移动端导航面板 */
.mobile-nav {
  display: none;
  background-color: var(--color-card);
  border-bottom: 1px solid var(--color-line);
  padding: 16px 24px 24px;
}

.mobile-nav.is-open {
  display: block;
}

.mobile-nav-group {
  padding: 12px 0;
  border-bottom: 1px solid var(--color-line);
}

.mobile-nav-group:last-child {
  border-bottom: none;
}

.mobile-nav-group a {
  display: block;
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  padding: 4px 0;
}

.mobile-nav-group a.is-current {
  color: var(--color-accent);
}

.nav-desc {
  font-size: 13px;
  color: var(--color-muted);
  margin-top: 2px;
  line-height: 1.5;
}

/* 主内容区域 */
.site-main {
  flex: 1;
}

.inner-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
  width: 100%;
}

.home-main {
  width: 100%;
}

/* 面包屑 */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  font-size: 14px;
  color: var(--color-muted);
  padding: 20px 0 0;
}

.breadcrumb a {
  color: var(--color-muted);
  font-size: 14px;
}

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

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

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

/* 页面标题区 */
.page-header {
  padding: 28px 0 16px;
  border-bottom: 1px solid var(--color-line);
  margin-bottom: 24px;
}

.page-title {
  font-size: 32px;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: 0.01em;
}

.page-summary {
  font-size: 16px;
  color: var(--color-muted);
  line-height: 1.75;
  margin-top: 12px;
  max-width: var(--content-width);
}

.page-title-area {
  padding: 24px 0 8px;
}

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

.page-heading {
  margin-bottom: 8px;
}

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

/* 布局容器 */
.layout-shell {
  display: flex;
  gap: 32px;
  align-items: flex-start;
  padding-bottom: 48px;
  width: 100%;
}

.layout-shell.sidebar-left {
  display: flex;
}

.sidebar-left .page-aside,
.sidebar-left .page-sidebar,
.sidebar-left .guide-sidebar {
  order: 0;
}

.sidebar-left .page-content,
.sidebar-left .guide-content,
.sidebar-left .site-main.inner-main {
  order: 1;
}

/* 侧栏与主内容宽度 */
.page-aside,
.page-sidebar,
.guide-sidebar,
.topics-sidebar {
  width: 280px;
  flex-shrink: 0;
}

.page-content,
.guide-content,
.topics-content {
  flex: 1;
  min-width: 0;
}

/* 页脚 */
.site-footer {
  background-color: var(--color-card);
  border-top: 1px solid var(--color-line);
  margin-top: 0;
}

.footer-top {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 24px 32px;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
}

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

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

.footer-col-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 12px;
}

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

.footer-column ul li a {
  font-size: 14px;
  color: var(--color-muted);
  transition: color 0.2s ease;
}

.footer-column ul li a:hover {
  color: var(--color-accent);
}

.footer-bottom {
  border-top: 1px solid var(--color-line);
  padding: 20px 24px;
}

.footer-bottom p {
  max-width: var(--container-width);
  margin: 0 auto;
  font-size: 13px;
  color: var(--color-muted);
  line-height: 1.6;
}

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

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

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

.btn-primary:hover {
  background-color: #8A3F1F;
  border-color: #8A3F1F;
  color: #fff;
  transform: translateY(-1px);
}

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

.btn-secondary:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  transform: translateY(-1px);
}

/* 文本链接 */
.text-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-accent);
  padding: 4px 0;
}

.text-link::after {
  content: "→";
  transition: transform 0.2s ease;
}

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

.text-link.center {
  display: flex;
  justify-content: center;
}

/* 区块标题 */
.section-heading {
  margin-bottom: 24px;
}

.section-heading h2 {
  font-size: 24px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 6px;
}

.section-heading p {
  font-size: 15px;
  color: var(--color-muted);
  line-height: 1.6;
  max-width: 640px;
}

/* 侧栏卡片 */
.aside-card,
.sidebar-card {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 24px;
  margin-bottom: 24px;
}

.aside-label,
.sidebar-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-line);
}

.aside-card p:not(.aside-label) {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.65;
  margin-bottom: 8px;
}

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

/* 锚点列表 */
.anchor-list li {
  margin-bottom: 4px;
}

.anchor-list li a {
  display: block;
  padding: 8px 10px;
  font-size: 14px;
  color: var(--color-text);
  border-radius: var(--radius-sm);
  border-left: 2px solid transparent;
  transition: background-color 0.2s ease, border-color 0.2s ease,
    color 0.2s ease;
}

.anchor-list li a:hover {
  background-color: var(--color-bg-soft);
  color: var(--color-accent);
  border-left-color: var(--color-accent);
}

/* 编号列表 */
.numbered-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.numbered-item {
  display: flex;
  gap: 16px;
  padding: 20px;
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  transition: box-shadow 0.2s ease, border-color 0.2s ease,
    transform 0.2s ease;
}

.numbered-item:hover {
  box-shadow: var(--shadow-card-hover);
  border-color: var(--color-line-dark);
  transform: translateY(-2px);
}

.item-number {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-accent);
  flex-shrink: 0;
  min-width: 36px;
  line-height: 1.3;
}

.numbered-item h3 {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 6px;
}

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

/* 详情块 */
.detail-block {
  margin-bottom: 24px;
}

.detail-block h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 10px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--color-line);
}

.detail-list li,
.process-detail .detail-block ul li,
.checklist li,
.preparation-list li,
.confidential-list li,
.notes-list li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 6px;
}

.detail-list li::before,
.process-detail .detail-block ul li::before,
.checklist li::before,
.preparation-list li::before,
.confidential-list li::before,
.notes-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 6px;
  background-color: var(--color-accent);
  border-radius: 1px;
}

/* 相关入口 */
.related-links {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 32px 24px 48px;
  width: 100%;
}

.related-links-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-muted);
  display: block;
  margin-bottom: 12px;
}

.related-links-item {
  display: inline-block;
  margin-right: 16px;
  font-size: 14px;
  color: var(--color-accent);
  padding: 6px 0;
}

.related-links-item:hover {
  color: #8A3F1F;
}

.related-entry {
  padding: 32px 0;
}

.related-entry h2 {
  font-size: 20px;
  margin-bottom: 8px;
}

.related-entry p {
  font-size: 14px;
  color: var(--color-muted);
  margin-bottom: 16px;
}

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

.related-card {
  display: block;
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 20px;
  transition: box-shadow 0.2s ease, border-color 0.2s ease,
    transform 0.2s ease;
}

.related-card:hover {
  box-shadow: var(--shadow-card-hover);
  border-color: var(--color-line-dark);
  transform: translateY(-2px);
}

.related-card h3,
.related-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 6px;
}

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

/* 图片容器 */
figure {
  margin: 0;
}

figcaption {
  font-size: 13px;
  color: var(--color-muted);
  line-height: 1.5;
  padding: 8px 0 0;
  text-align: left;
}

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

/* 首屏工作台 */
.hero-workbench {
  background-color: var(--color-bg-soft);
  border-bottom: 1px solid var(--color-line);
}

.hero-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 64px 24px;
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 48px;
  align-items: center;
}

.hero-kicker {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent);
  letter-spacing: 0.04em;
  margin-bottom: 12px;
  text-transform: uppercase;
}

.hero-copy h1 {
  font-size: 32px;
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.3;
  margin-bottom: 16px;
}

.hero-lead {
  font-size: 16px;
  color: var(--color-text-light);
  line-height: 1.75;
  margin-bottom: 24px;
  max-width: 520px;
}

.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

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

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

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

/* 首页主体布局 */
.home-layout {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 24px;
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 40px;
  align-items: start;
}

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

/* 服务领域编号速览 */
.fields-overview {
  margin-bottom: 48px;
}

.field-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.field-item {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 24px;
  transition: box-shadow 0.2s ease, border-color 0.2s ease,
    transform 0.2s ease;
}

.field-item:hover {
  box-shadow: var(--shadow-card-hover);
  border-color: var(--color-line-dark);
  transform: translateY(-2px);
}

.field-num {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-accent);
  flex-shrink: 0;
  min-width: 40px;
  line-height: 1.2;
}

.field-item h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 4px;
}

.field-item p {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.6;
  margin-bottom: 8px;
}

.field-item a {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent);
}

/* 实用指南入口 */
.guide-entry {
  margin-bottom: 8px;
}

.question-list {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.question-list li {
  border-bottom: 1px solid var(--color-line);
}

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

.question-list li a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 20px;
  font-size: 15px;
  color: var(--color-text);
  transition: background-color 0.2s ease, color 0.2s ease;
}

.question-list li a:hover {
  background-color: var(--color-bg-soft);
  color: var(--color-accent);
}

.arrow {
  font-size: 14px;
  color: var(--color-line-dark);
  transition: transform 0.2s ease, color 0.2s ease;
  flex-shrink: 0;
}

.question-list li a:hover .arrow {
  transform: translateX(4px);
  color: var(--color-accent);
}

/* 右侧栏 */
.home-aside {
  min-width: 0;
}

/* 合作流程预览 */
.process-preview {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 24px;
  margin-bottom: 24px;
}

.process-steps {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.step-item {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--color-line);
}

.step-item:last-child {
  padding-bottom: 0;
  border-bottom: none;
}

.step-num {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-accent);
  flex-shrink: 0;
  min-width: 28px;
  line-height: 1.4;
}

.step-item h3 {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 2px;
}

.step-item p {
  font-size: 13px;
  color: var(--color-muted);
  line-height: 1.55;
}

/* 专题洞察预览 */
.topics-preview {
  background-color: var(--color-bg-soft);
  border-top: 1px solid var(--color-line);
  border-bottom: 1px solid var(--color-line);
  padding: 48px 0;
}

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

.topic-grid {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.topic-card {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: box-shadow 0.2s ease, border-color 0.2s ease,
    transform 0.2s ease;
  display: flex;
  flex-direction: column;
}

.topic-card:hover {
  box-shadow: var(--shadow-card-hover);
  border-color: var(--color-line-dark);
  transform: translateY(-2px);
}

.topic-card figure {
  overflow: hidden;
}

.topic-card figure img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.topic-content {
  padding: 20px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.topic-tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  color: var(--color-accent);
  background-color: rgba(168, 81, 43, 0.08);
  border-radius: 2px;
  padding: 2px 8px;
  margin-bottom: 10px;
  align-self: flex-start;
}

.topic-content h3 {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 8px;
  line-height: 1.4;
}

.topic-content p {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.65;
  margin-bottom: 12px;
  flex: 1;
}

.topic-content a {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent);
}

.topics-preview > .text-link {
  max-width: var(--container-width);
  margin: 24px auto 0;
  padding: 0 24px;
}

/* 咨询与反馈 */
.contact-entry {
  background-color: var(--color-card);
  border-bottom: 1px solid var(--color-line);
}

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

.contact-inner h2 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 12px;
}

.contact-inner > p {
  font-size: 15px;
  color: var(--color-muted);
  max-width: 640px;
  margin: 0 auto 24px;
}

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

.contact-note {
  font-size: 13px;
  color: var(--color-muted);
}

.contact-note a {
  color: var(--color-accent);
  font-weight: 500;
}

/* ============================================================
   Pages — 品牌与承诺
   ============================================================ */

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

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

/* 服务原则 */
.content-section .numbered-list {
  gap: 12px;
}

/* 信息安全边界 */
.boundary-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.boundary-item {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.65;
}

/* ============================================================
   Pages — 服务领域
   ============================================================ */

.service-section {
  margin-bottom: 48px;
  scroll-margin-top: 88px;
}

.service-section .section-heading {
  display: flex;
  align-items: baseline;
  gap: 12px;
  border-bottom: 1px solid var(--color-line);
  padding-bottom: 12px;
  margin-bottom: 16px;
}

.section-number {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-accent);
  flex-shrink: 0;
}

.service-section .section-heading h2 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 0;
}

.section-lead {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 20px;
  max-width: var(--content-width);
}

.service-media {
  margin-bottom: 20px;
}

.service-media figure {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.service-media img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 7;
  object-fit: cover;
}

.service-media figcaption {
  padding: 10px 16px;
}

.service-detail {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.detail-block {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 20px;
  margin-bottom: 0;
}

.detail-block h3 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 10px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--color-line);
}

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

.process-section {
  margin-bottom: 48px;
  scroll-margin-top: 88px;
}

.process-section .section-heading {
  display: flex;
  align-items: baseline;
  gap: 12px;
  border-bottom: 1px solid var(--color-line);
  padding-bottom: 12px;
  margin-bottom: 16px;
}

.step-number {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-accent);
  flex-shrink: 0;
}

.process-section .section-heading h2 {
  font-size: 22px;
  margin-bottom: 0;
}

.section-intro {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 20px;
  max-width: var(--content-width);
}

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

.process-detail .detail-block {
  margin-bottom: 0;
}

/* 准备清单 */
.checklist {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 24px 28px;
}

.checklist li {
  padding-left: 22px;
  margin-bottom: 10px;
}

.checklist li:last-child {
  margin-bottom: 0;
}

/* 相关入口 */
.related-links h2 {
  font-size: 20px;
  margin-bottom: 16px;
}

/* ============================================================
   Pages — 实用指南
   ============================================================ */

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

.faq-section {
  margin-bottom: 48px;
}

.faq-section > h2,
.boundary-section > h2,
.preparation-section > h2,
.confidential-section > h2 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 20px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-line);
}

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.faq-item {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 16px 20px;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
  cursor: pointer;
  list-style: none;
  transition: background-color 0.2s ease;
}

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

.faq-item summary::after {
  content: "+";
  font-size: 20px;
  font-weight: 400;
  color: var(--color-accent);
  flex-shrink: 0;
  transition: transform 0.2s ease;
}

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

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

.faq-item p {
  padding: 0 20px 16px;
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
}

/* 边界说明 */
.boundary-section,
.preparation-section,
.confidential-section {
  margin-bottom: 48px;
}

.boundary-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.boundary-list li {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 16px 20px;
}

.boundary-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 4px;
}

.boundary-list li p:last-child {
  font-size: 13px;
  color: var(--color-muted);
  line-height: 1.6;
  padding-left: 0;
}

.boundary-list li p:last-child::before {
  display: none;
}

/* 准备清单 */
.preparation-list {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 24px 28px;
}

.preparation-list li {
  padding-left: 22px;
  margin-bottom: 14px;
}

.preparation-list li:last-child {
  margin-bottom: 0;
}

.prep-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 2px;
}

.preparation-list li p:last-child {
  font-size: 13px;
  color: var(--color-muted);
  line-height: 1.6;
}

/* 保密约定 */
.confidential-list {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 24px 28px;
}

.confidential-list li {
  padding-left: 22px;
  margin-bottom: 10px;
}

.confidential-list li:last-child {
  margin-bottom: 0;
}

/* 指南配图 */
.guide-image-block {
  margin: 32px 0;
}

.guide-image-block figure {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.guide-image-block img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 6;
  object-fit: cover;
}

.guide-image-block figcaption {
  padding: 10px 16px;
}

/* ============================================================
   Pages — 专题洞察
   ============================================================ */

.topics-layout {
  display: flex;
  gap: 32px;
  align-items: flex-start;
  padding-bottom: 48px;
}

.topics-sidebar {
  width: 260px;
  flex-shrink: 0;
}

.topics-sidebar .sidebar-title {
  margin-bottom: 16px;
}

.topic-tags {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.topic-tags li a {
  display: block;
  padding: 10px 14px;
  font-size: 14px;
  color: var(--color-text);
  border-left: 2px solid transparent;
  transition: background-color 0.2s ease, border-color 0.2s ease,
    color 0.2s ease;
}

.topic-tags li a:hover {
  background-color: var(--color-bg-soft);
  color: var(--color-accent);
  border-left-color: var(--color-accent);
}

.topics-content {
  flex: 1;
  min-width: 0;
}

.article-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-bottom: 40px;
}

.topics-content .topic-card {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: box-shadow 0.2s ease, border-color 0.2s ease,
    transform 0.2s ease;
  display: flex;
  flex-direction: column;
  scroll-margin-top: 88px;
}

.topics-content .topic-card:hover {
  box-shadow: var(--shadow-card-hover);
  border-color: var(--color-line-dark);
  transform: translateY(-2px);
}

.card-media {
  overflow: hidden;
}

.card-media img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.card-body {
  padding: 20px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.card-tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  color: var(--color-accent);
  background-color: rgba(168, 81, 43, 0.08);
  border-radius: 2px;
  padding: 2px 8px;
  margin-bottom: 10px;
  align-self: flex-start;
}

.card-title {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 8px;
  line-height: 1.4;
}

.card-excerpt {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.65;
  margin-bottom: 12px;
  flex: 1;
}

.read-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent);
}

/* 阅读规则 */
.reading-notes {
  background-color: var(--color-bg-soft);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 24px;
  margin-bottom: 40px;
}

.notes-title {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 12px;
}

.notes-list li {
  padding-left: 18px;
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 6px;
}

.notes-list li:last-child {
  margin-bottom: 0;
}

/* 专题页相关入口 */
.topics-layout + .related-links {
  padding-top: 0;
}

.related-links > a {
  display: inline-block;
  margin-right: 16px;
  font-size: 14px;
  color: var(--color-accent);
  padding: 6px 0;
}

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

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

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

.error-code {
  font-size: 64px;
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1;
  margin-bottom: 16px;
}

.error-title {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 12px;
}

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

.error-actions {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
}

.error-btn {
  display: inline-block;
  padding: 10px 24px;
  background-color: var(--color-accent);
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: background-color 0.2s ease;
}

.error-btn:hover {
  background-color: #8A3F1F;
  color: #fff;
}

.error-link {
  display: inline-block;
  padding: 10px 24px;
  border: 1px solid var(--color-line-dark);
  color: var(--color-text);
  font-size: 14px;
  font-weight: 500;
  border-radius: var(--radius-sm);
  transition: border-color 0.2s ease, color 0.2s ease;
}

.error-link:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

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

/* 桌面窄屏 */
@media (max-width: 1024px) {
  .header-inner {
    padding: 0 20px;
  }

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

  .nav-cta {
    padding: 8px 16px;
    font-size: 13px;
  }

  .home-layout {
    grid-template-columns: 1fr 300px;
    gap: 32px;
    padding: 40px 20px;
  }

  .hero-inner {
    padding: 48px 20px;
    gap: 32px;
  }

  .topic-grid {
    padding: 0 20px;
  }

  .topics-preview .section-heading {
    padding: 0 20px;
  }

  .footer-top {
    padding: 40px 20px 28px;
    gap: 32px;
  }

  .footer-bottom {
    padding: 16px 20px;
  }

  .related-links {
    padding: 24px 20px 40px;
  }

  .inner-main {
    padding: 0 20px;
  }

  .layout-shell {
    gap: 24px;
  }

  .page-aside,
  .page-sidebar,
  .guide-sidebar,
  .topics-sidebar {
    width: 240px;
  }

  .contact-inner {
    padding: 40px 20px;
  }
}

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

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

  .process-preview {
    margin-bottom: 0;
  }

  .guide-entry {
    margin-bottom: 0;
  }

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

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

  .layout-shell.sidebar-left {
    flex-direction: column;
  }

  .sidebar-left .page-aside,
  .sidebar-left .page-sidebar,
  .sidebar-left .guide-sidebar {
    order: 1;
    width: 100%;
  }

  .sidebar-left .page-content,
  .sidebar-left .guide-content {
    order: 0;
    width: 100%;
  }

  .sidebar-left .site-main.inner-main {
    order: 0;
  }

  /* fields 页：aside 在 main 之后 */
  .page-fields .layout-shell.sidebar-left {
    flex-direction: column;
  }

  .page-fields .page-sidebar {
    order: 1;
    width: 100%;
  }

  .page-fields .site-main.inner-main {
    order: 0;
  }

  /* 侧栏卡片横排 */
  .page-aside .aside-card,
  .page-sidebar .sidebar-card,
  .guide-sidebar .sidebar-card {
    margin-bottom: 12px;
  }

  .topics-layout {
    flex-direction: column;
  }

  .topics-sidebar {
    width: 100%;
    order: 1;
  }

  .topics-content {
    order: 0;
    width: 100%;
  }

  .topic-tags {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 8px;
  }

  .topic-tags li a {
    border-left: none;
    border-bottom: 2px solid transparent;
    padding: 8px 14px;
    border-radius: var(--radius-sm);
  }

  .topic-tags li a:hover {
    border-bottom-color: var(--color-accent);
  }
}

/* 手机 */
@media (max-width: 768px) {
  .header-inner {
    height: 64px;
    padding: 0 16px;
    gap: 12px;
  }

  .brand-tagline {
    display: none;
  }

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

  .main-nav.site-nav {
    display: none;
  }

  .nav-cta {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .mobile-nav {
    display: none;
    padding: 12px 16px 20px;
  }

  .mobile-nav.is-open {
    display: block;
  }

  /* 首页 */
  .hero-inner {
    grid-template-columns: 1fr;
    padding: 32px 16px;
    gap: 24px;
  }

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

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

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

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

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

  .home-layout {
    grid-template-columns: 1fr;
    padding: 32px 16px;
    gap: 32px;
  }

  .home-aside {
    display: block;
  }

  .process-preview {
    margin-bottom: 24px;
  }

  .field-item {
    padding: 20px;
    gap: 14px;
  }

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

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

  .topics-preview {
    padding: 32px 0;
  }

  .topics-preview > .text-link {
    padding: 0 16px;
  }

  .contact-inner {
    padding: 32px 16px;
  }

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

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

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

  .breadcrumb {
    padding-top: 16px;
    font-size: 13px;
  }

  .page-header {
    padding: 20px 0 12px;
    margin-bottom: 20px;
  }

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

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

  .layout-shell {
    gap: 20px;
    padding-bottom: 32px;
  }

  /* 服务领域 */
  .service-detail {
    grid-template-columns: 1fr;
    gap: 12px;
  }

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

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

  /* 指南 */
  .boundary-list {
    grid-template-columns: 1fr;
  }

  .guide-image-block img {
    aspect-ratio: 16 / 9;
  }

  /* 专题 */
  .article-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  /* 相关入口 */
  .related-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .related-links {
    padding: 24px 16px 32px;
  }

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

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

  .footer-bottom {
    padding: 16px;
  }

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

  /* 404 */
  .error-code {
    font-size: 48px;
  }

  .error-title {
    font-size: 20px;
  }
}

/* 小屏手机 */
@media (max-width: 480px) {
  .hero-copy h1 {
    font-size: 24px;
  }

  .hero-actions {
    gap: 10px;
  }

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

  .field-num {
    font-size: 18px;
    min-width: 32px;
  }

  .field-item h3 {
    font-size: 16px;
  }

  .step-num {
    font-size: 14px;
    min-width: 24px;
  }

  .topic-content h3 {
    font-size: 16px;
  }

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

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

  .section-number,
  .step-number {
    font-size: 18px;
  }

  .numbered-item {
    padding: 16px;
    gap: 12px;
  }

  .item-number {
    font-size: 18px;
    min-width: 30px;
  }

  .aside-card,
  .sidebar-card {
    padding: 20px;
  }

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

  .faq-item p {
    padding: 0 16px 14px;
    font-size: 13px;
  }
}

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

/* 程序验收反馈：移动端正文优先 */
@media (max-width: 768px) {
  .site-main :is(.page-content, .main-content, .content-main) {
    order: 1;
  }

  .site-main :is(aside, .sidebar) {
    order: 2;
  }
}