/* ============================================================
   吃瓜爆料网 - 整站样式表
   版本: 1.0
   说明: 本样式表覆盖整站全部页面共用视觉骨架与各页业务模块
   ============================================================ */

/* ============================================================
   1. Base - 基础变量、重置与全局字体
   ============================================================ */
:root {
  /* 色彩系统 */
  --color-bg: #F5F6F7;
  --color-card: #FFFFFF;
  --color-text: #333333;
  --color-text-secondary: #666666;
  --color-link: #1E6FD9;
  --color-link-hover: #1456A8;
  --color-border: #E5E7EB;
  --color-title: #14336B;
  --color-header-bg: #FFFFFF;
  --color-footer-bg: #FFFFFF;

  /* 布局尺寸 */
  --container-width: 1200px;
  --reading-width: 760px;
  --header-height: 66px;
  --space-section: 56px;
  --space-block: 32px;
  --radius-card: 8px;
  --radius-small: 4px;

  /* 字体 */
  --font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Helvetica Neue", Arial, sans-serif;
  --font-size-body: 15px;
  --font-size-h1: 30px;
  --font-size-h2: 20px;
  --font-size-h3: 16px;
  --line-height-body: 1.8;
}

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

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

body {
  font-family: var(--font-family);
  font-size: var(--font-size-body);
  line-height: var(--line-height-body);
  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-link);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--color-link-hover);
  text-decoration: underline;
}

ul, ol {
  list-style: none;
}

h1, h2, h3, h4, h5, h6 {
  color: var(--color-title);
  line-height: 1.4;
  font-weight: 700;
}

h1 {
  font-size: var(--font-size-h1);
}

h2 {
  font-size: var(--font-size-h2);
}

h3 {
  font-size: var(--font-size-h3);
}

p {
  margin-bottom: 0;
}

/* 滚动渐入动画 - 不影响初始可见性 */
.reveal {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: no-preference) {
  .reveal-visible {
    animation: fadeInUp 0.5s ease both;
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

.site-main {
  flex: 1 0 auto;
  width: 100%;
}

.site-home {
  padding-bottom: 0;
}

.inner-main {
  padding-bottom: 64px;
}

/* 统一容器 */
.header-inner,
.footer-inner,
.hero,
.service-index,
.process-preview,
.method-summary,
.faq-preview,
.boundary-tip,
.breadcrumb,
.page-header,
.page-title-area,
.method-section,
.evidence-section,
.report-section,
.method-figure,
.related-links,
.timeline-section,
.materials-section,
.delivery-section,
.faq-cats-section,
.faq-list,
.checklist-section,
.content-figure,
.boundary-quote,
.scope-section,
.preconditions-section,
.boundary-figure,
.error-section {
  width: 100%;
  max-width: var(--container-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

/* 长文窄栏 */
.page-title-area,
.method-section,
.evidence-section,
.report-section,
.method-figure,
.timeline-section,
.delivery-section,
.checklist-section,
.content-figure,
.boundary-quote {
  max-width: var(--reading-width);
}

/* 宽模块 */
.service-index,
.process-preview,
.faq-preview,
.boundary-tip,
.materials-section,
.faq-cats-section,
.faq-list,
.scope-section,
.preconditions-section,
.boundary-figure {
  max-width: var(--container-width);
}

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

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

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  max-width: var(--container-width);
}

.brand-link {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-title);
  text-decoration: none;
  white-space: nowrap;
  letter-spacing: 0.5px;
}

.brand-link:hover {
  color: var(--color-title);
  text-decoration: none;
}

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

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

.nav-item {
  display: block;
  padding: 8px 14px;
  font-size: 15px;
  color: var(--color-text);
  border-radius: var(--radius-small);
  transition: background-color 0.2s ease, color 0.2s ease;
}

.nav-item:hover {
  color: var(--color-link);
  background-color: rgba(30, 111, 217, 0.06);
  text-decoration: none;
}

.nav-item.is-current {
  color: var(--color-link);
  font-weight: 600;
  background-color: rgba(30, 111, 217, 0.08);
}

/* 汉堡按钮（移动端默认隐藏） */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 0;
  border: none;
  background: transparent;
  cursor: pointer;
  border-radius: var(--radius-small);
}

.nav-toggle:hover {
  background-color: rgba(30, 111, 217, 0.06);
}

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

/* 展开状态的三条线变化 */
.nav-toggle[aria-expanded="true"] .toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

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

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

/* ---------- 面包屑 ---------- */
.breadcrumb {
  padding-top: 16px;
  padding-bottom: 8px;
  font-size: 13px;
  color: var(--color-text-secondary);
}

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

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

.breadcrumb-sep {
  margin: 0 8px;
  color: var(--color-border);
}

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

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

.breadcrumb-list li + li::before {
  content: "›";
  margin-right: 8px;
  color: var(--color-border);
}

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

.page-title {
  font-size: var(--font-size-h1);
  line-height: 1.4;
  margin-bottom: 0;
}

.page-title-area {
  padding-top: 12px;
  padding-bottom: 32px;
}

.page-title-area .page-lead {
  font-size: 16px;
  color: var(--color-text-secondary);
  line-height: 1.8;
}

/* ---------- 按钮 ---------- */
.btn-primary,
.btn-secondary {
  display: inline-block;
  padding: 10px 24px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-small);
  text-align: center;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

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

.btn-primary:hover {
  background-color: var(--color-link-hover);
  color: #FFFFFF;
  text-decoration: none;
}

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

.btn-secondary:hover {
  background-color: rgba(30, 111, 217, 0.06);
  color: var(--color-link-hover);
  text-decoration: none;
}

/* ---------- 区块标题 ---------- */
.section-head {
  text-align: center;
  margin-bottom: 36px;
}

.section-head h2 {
  margin-bottom: 8px;
}

.section-head p {
  color: var(--color-text-secondary);
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
}

.section-title {
  margin-bottom: 20px;
}

.section-intro {
  color: var(--color-text-secondary);
  margin-bottom: 24px;
}

/* ---------- 区块链接 ---------- */
.section-link {
  display: inline-block;
  margin-top: 24px;
  font-weight: 600;
}

/* ---------- 相关链接卡片 ---------- */
.related-links {
  padding-top: 48px;
  padding-bottom: 0;
}

.related-links h2 {
  margin-bottom: 20px;
}

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

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

.related-card:hover {
  border-color: var(--color-link);
  box-shadow: 0 2px 8px rgba(20, 51, 107, 0.08);
  text-decoration: none;
}

.related-card h3 {
  margin-bottom: 6px;
  font-size: 16px;
}

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

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

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

.related-list li a:hover {
  border-color: var(--color-link);
  box-shadow: 0 2px 8px rgba(20, 51, 107, 0.08);
  text-decoration: none;
}

.related-list li a h3 {
  margin-bottom: 6px;
  font-size: 16px;
}

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

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

.faq-item summary {
  padding: 16px 20px;
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  cursor: pointer;
  list-style: none;
  position: relative;
  padding-right: 44px;
  transition: color 0.2s ease;
}

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

.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 20px;
  font-weight: 400;
  color: var(--color-link);
  transition: transform 0.2s ease;
}

.faq-item[open] summary::after {
  content: "−";
  transform: translateY(-50%);
}

.faq-item summary:hover {
  color: var(--color-link);
}

.faq-item p {
  padding: 0 20px 16px;
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.8;
}

/* ---------- 页脚 ---------- */
.site-footer {
  background-color: var(--color-footer-bg);
  border-top: 1px solid var(--color-border);
  margin-top: 48px;
}

.footer-inner {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr;
  gap: 40px;
  padding-top: 40px;
  padding-bottom: 32px;
}

.footer-brand h2 {
  font-size: 20px;
  margin-bottom: 12px;
}

.footer-brand p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 8px;
}

.footer-nav h2,
.footer-guide h2 {
  font-size: 16px;
  margin-bottom: 14px;
}

.footer-nav ul li,
.footer-guide ul li {
  margin-bottom: 8px;
}

.footer-nav ul li a,
.footer-guide ul li a {
  font-size: 14px;
  color: var(--color-text-secondary);
}

.footer-nav ul li a:hover,
.footer-guide ul li a:hover {
  color: var(--color-link);
}

.footer-bottom {
  border-top: 1px solid var(--color-border);
  padding: 16px 24px;
  text-align: center;
}

.footer-bottom p {
  font-size: 13px;
  color: var(--color-text-secondary);
}

/* ============================================================
   4. Pages - 首页模块
   ============================================================ */

/* ---------- Hero 首屏 ---------- */
.hero {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 48px;
  align-items: center;
  padding-top: 48px;
  padding-bottom: 56px;
}

.hero-text h1 {
  margin-bottom: 16px;
  line-height: 1.4;
}

.hero-lead {
  font-size: 16px;
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin-bottom: 24px;
}

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

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

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

/* ---------- 服务索引 ---------- */
.service-index {
  padding-top: 48px;
  padding-bottom: 56px;
}

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

.service-card {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 24px;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.service-card:hover {
  border-color: var(--color-link);
  box-shadow: 0 2px 12px rgba(20, 51, 107, 0.06);
}

.service-no {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-link);
  background-color: rgba(30, 111, 217, 0.08);
  padding: 2px 10px;
  border-radius: 12px;
  margin-bottom: 12px;
}

.service-card h3 {
  margin-bottom: 8px;
}

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

.service-link {
  font-size: 14px;
  font-weight: 600;
}

/* ---------- 合作流程四步横条 ---------- */
.process-preview {
  padding-top: 48px;
  padding-bottom: 56px;
}

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

.step-item {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 24px;
  position: relative;
}

.step-item h3 {
  margin-bottom: 8px;
  font-size: 17px;
}

.step-item h3::before {
  content: "0" counter(step-counter);
  counter-increment: step-counter;
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-link);
  margin-bottom: 6px;
}

.process-steps {
  counter-reset: step-counter;
}

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

/* ---------- 事实核查方法摘要 ---------- */
.method-summary {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 48px;
  align-items: center;
  padding-top: 48px;
  padding-bottom: 56px;
}

.method-text h2 {
  margin-bottom: 12px;
}

.method-text > p {
  color: var(--color-text-secondary);
  margin-bottom: 24px;
}

.method-points {
  margin-bottom: 20px;
}

.method-points li {
  padding: 12px 0;
  border-bottom: 1px solid var(--color-border);
}

.method-points li:last-child {
  border-bottom: none;
}

.method-points h3 {
  margin-bottom: 4px;
  font-size: 16px;
}

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

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

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

.method-summary .method-figure {
  max-width: 100%;
}

/* ---------- 常见问题摘要 ---------- */
.faq-preview {
  padding-top: 48px;
  padding-bottom: 56px;
}

.faq-group {
  max-width: var(--reading-width);
  margin-left: auto;
  margin-right: auto;
}

.faq-preview .section-link {
  display: block;
  text-align: center;
  margin-top: 20px;
}

/* ---------- 服务边界提示 ---------- */
.boundary-tip {
  padding-top: 48px;
  padding-bottom: 56px;
  text-align: center;
}

.boundary-tip h2 {
  margin-bottom: 12px;
}

.boundary-tip > p {
  color: var(--color-text-secondary);
  max-width: 560px;
  margin: 0 auto 24px;
}

.boundary-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  max-width: 900px;
  margin: 0 auto 24px;
}

.boundary-list li {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 16px 20px;
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

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

/* ---------- 事实核查页 ---------- */
.method-section h2,
.evidence-section h2,
.report-section h2 {
  margin-bottom: 12px;
}

.method-section > p,
.evidence-section > p,
.report-section > p {
  color: var(--color-text-secondary);
  margin-bottom: 24px;
}

.steps {
  counter-reset: step-counter;
}

.steps li {
  position: relative;
  padding: 20px 0 20px 56px;
  border-bottom: 1px solid var(--color-border);
}

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

.steps li::before {
  counter-increment: step-counter;
  content: counter(step-counter);
  position: absolute;
  left: 0;
  top: 20px;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background-color: rgba(30, 111, 217, 0.1);
  color: var(--color-link);
  font-weight: 700;
  font-size: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.steps h3 {
  margin-bottom: 6px;
}

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

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

.evidence-types li {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 20px;
}

.evidence-types h3 {
  margin-bottom: 8px;
  font-size: 16px;
}

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

.report-sections li {
  padding: 16px 20px;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  margin-bottom: 12px;
}

.report-sections h3 {
  margin-bottom: 6px;
  font-size: 16px;
}

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

.method-figure {
  margin-top: 32px;
  border-radius: var(--radius-card);
  overflow: hidden;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
}

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

.method-figure figcaption {
  padding: 12px 16px;
  font-size: 13px;
  color: var(--color-text-secondary);
  text-align: center;
  border-top: 1px solid var(--color-border);
}

/* ---------- 合作流程页 ---------- */
.timeline-section h2,
.materials-section h2,
.delivery-section h2 {
  margin-bottom: 12px;
}

.timeline {
  position: relative;
  padding-left: 0;
}

.timeline-item {
  position: relative;
  padding: 0 0 32px 48px;
  border-left: 2px solid var(--color-border);
}

.timeline-item:last-child {
  padding-bottom: 0;
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: -8px;
  top: 4px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background-color: var(--color-link);
  border: 2px solid var(--color-card);
}

.timeline-item h3 {
  margin-bottom: 8px;
  font-size: 17px;
}

.timeline-item p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 8px;
}

.timeline-item .deliverable {
  font-size: 13px;
  color: var(--color-link);
  background-color: rgba(30, 111, 217, 0.06);
  display: inline-block;
  padding: 4px 12px;
  border-radius: 12px;
}

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

.material-card {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 24px;
}

.material-card h3 {
  margin-bottom: 8px;
  font-size: 16px;
}

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

.delivery li {
  padding: 16px 20px;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  margin-bottom: 12px;
}

.delivery h3 {
  margin-bottom: 6px;
  font-size: 16px;
}

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

.delivery-figure {
  margin-top: 32px;
  border-radius: var(--radius-card);
  overflow: hidden;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
}

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

.delivery-figure figcaption {
  padding: 12px 16px;
  font-size: 13px;
  color: var(--color-text-secondary);
  text-align: center;
  border-top: 1px solid var(--color-border);
}

/* ---------- 常见问题页 ---------- */
.faq-cats-section h2 {
  margin-bottom: 20px;
}

.faq-cats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-bottom: 32px;
}

.faq-cat-card a {
  display: block;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 24px;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.faq-cat-card a:hover {
  border-color: var(--color-link);
  box-shadow: 0 2px 12px rgba(20, 51, 107, 0.06);
  text-decoration: none;
}

.faq-cat-card h3 {
  margin-bottom: 8px;
  font-size: 16px;
}

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

.faq-cats-image {
  margin-top: 24px;
  border-radius: var(--radius-card);
  overflow: hidden;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
}

.faq-cats-image img {
  width: 100%;
  height: 240px;
  object-fit: cover;
}

.faq-list {
  padding-top: 16px;
}

.faq-group {
  margin-bottom: 36px;
}

.faq-group h2 {
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border);
}

.faq-group .faq-item {
  background-color: var(--color-card);
}

/* 常见问题页的 details 样式 */
.faq-list details {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  margin-bottom: 12px;
  overflow: hidden;
}

.faq-list details summary {
  padding: 16px 20px;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
  cursor: pointer;
  list-style: none;
  position: relative;
  padding-right: 44px;
  transition: color 0.2s ease;
}

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

.faq-list details summary::after {
  content: "+";
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 20px;
  font-weight: 400;
  color: var(--color-link);
}

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

.faq-list details summary:hover {
  color: var(--color-link);
}

.faq-list details p {
  padding: 0 20px 16px;
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.8;
}

/* ---------- 合规指南页 ---------- */
.checklist-section {
  margin-bottom: 32px;
}

.checklist-section h2 {
  margin-bottom: 12px;
}

.checklist-section > p {
  color: var(--color-text-secondary);
  margin-bottom: 20px;
}

.checklist {
  counter-reset: check-counter;
}

.checklist li {
  position: relative;
  padding: 16px 20px 16px 56px;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  margin-bottom: 12px;
}

.checklist li::before {
  counter-increment: check-counter;
  content: counter(check-counter);
  position: absolute;
  left: 16px;
  top: 16px;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background-color: rgba(30, 111, 217, 0.1);
  color: var(--color-link);
  font-weight: 600;
  font-size: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.checklist h3 {
  margin-bottom: 6px;
  font-size: 15px;
}

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

.content-figure {
  margin: 24px auto 32px;
  border-radius: var(--radius-card);
  overflow: hidden;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
}

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

.content-figure figcaption {
  padding: 12px 16px;
  font-size: 13px;
  color: var(--color-text-secondary);
  text-align: center;
  border-top: 1px solid var(--color-border);
}

.boundary-quote {
  margin-top: 32px;
  padding: 24px;
  background-color: rgba(30, 111, 217, 0.04);
  border: 1px solid rgba(30, 111, 217, 0.2);
  border-radius: var(--radius-card);
}

.boundary-quote p {
  font-size: 15px;
  color: var(--color-text);
  line-height: 1.8;
  margin-bottom: 12px;
}

.boundary-quote a {
  font-weight: 600;
}

/* ---------- 服务边界页 ---------- */
.scope-section {
  padding-top: 16px;
  padding-bottom: 32px;
}

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

.scope-inner,
.scope-outer {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 24px;
}

.scope-inner h2,
.scope-outer h2 {
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border);
}

.in-scope li,
.out-scope li {
  padding: 12px 0;
  border-bottom: 1px solid var(--color-border);
}

.in-scope li:last-child,
.out-scope li:last-child {
  border-bottom: none;
}

.in-scope h3,
.out-scope h3 {
  margin-bottom: 4px;
  font-size: 15px;
}

.in-scope h3::before {
  content: "✓ ";
  color: #2E8B57;
}

.out-scope h3::before {
  content: "× ";
  color: #C0392B;
}

.in-scope p,
.out-scope p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.preconditions-section {
  padding-top: 16px;
  padding-bottom: 32px;
}

.preconditions-section h2 {
  margin-bottom: 20px;
}

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

.preconditions li {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 20px;
}

.preconditions h3 {
  margin-bottom: 8px;
  font-size: 16px;
}

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

.boundary-figure {
  padding-top: 16px;
  padding-bottom: 32px;
}

.scope-image {
  border-radius: var(--radius-card);
  overflow: hidden;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
}

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

.scope-image figcaption {
  padding: 12px 16px;
  font-size: 13px;
  color: var(--color-text-secondary);
  text-align: center;
  border-top: 1px solid var(--color-border);
}

/* ---------- 404 页 ---------- */
.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 80px 24px;
}

.error-section {
  text-align: center;
  max-width: 480px;
}

.error-code {
  font-size: 72px;
  font-weight: 700;
  color: var(--color-title);
  line-height: 1;
  margin-bottom: 16px;
}

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

.error-desc {
  color: var(--color-text-secondary);
  margin-bottom: 24px;
}

.error-link {
  display: inline-block;
  padding: 10px 24px;
  background-color: var(--color-link);
  color: #FFFFFF;
  border-radius: var(--radius-small);
  font-weight: 600;
}

.error-link:hover {
  background-color: var(--color-link-hover);
  color: #FFFFFF;
  text-decoration: none;
}

/* ============================================================
   6. Responsive - 响应式适配
   ============================================================ */

/* ---------- 平板与窄桌面 ---------- */
@media (max-width: 1024px) {
  .hero {
    gap: 32px;
  }

  .hero-figure img {
    height: 280px;
  }

  .method-summary {
    gap: 32px;
  }

  .method-figure img {
    height: 260px;
  }
}

/* ---------- 移动端 ---------- */
@media (max-width: 768px) {
  /* 基础容器 */
  .header-inner,
  .footer-inner,
  .hero,
  .service-index,
  .process-preview,
  .method-summary,
  .faq-preview,
  .boundary-tip,
  .breadcrumb,
  .page-header,
  .page-title-area,
  .method-section,
  .evidence-section,
  .report-section,
  .method-figure,
  .related-links,
  .timeline-section,
  .materials-section,
  .delivery-section,
  .faq-cats-section,
  .faq-list,
  .checklist-section,
  .content-figure,
  .boundary-quote,
  .scope-section,
  .preconditions-section,
  .boundary-figure,
  .error-section {
    padding-left: 12px;
    padding-right: 12px;
  }

  /* 页头 */
  .header-inner {
    height: 56px;
  }

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

  /* 汉堡按钮显示 */
  .nav-toggle {
    display: flex;
  }

  /* 移动导航列表收起 */
  .nav-list {
    display: none;
    position: absolute;
    top: 56px;
    left: 0;
    right: 0;
    background-color: var(--color-card);
    border-bottom: 1px solid var(--color-border);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
    flex-direction: column;
    align-items: stretch;
    padding: 8px 12px;
    gap: 0;
    z-index: 99;
  }

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

  .nav-item {
    padding: 12px 16px;
    font-size: 15px;
    min-height: 44px;
    display: flex;
    align-items: center;
    border-radius: var(--radius-small);
  }

  .nav-item.is-current {
    background-color: rgba(30, 111, 217, 0.08);
  }

  /* 首页 Hero 移动端图片在前 */
  .hero {
    grid-template-columns: 1fr;
    gap: 24px;
    padding-top: 24px;
    padding-bottom: 40px;
  }

  .hero-figure {
    order: -1;
  }

  .hero-figure img {
    height: 220px;
  }

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

  .hero-actions {
    flex-direction: column;
  }

  .btn-primary,
  .btn-secondary {
    width: 100%;
    text-align: center;
    min-height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
  }

  /* 服务索引 */
  .service-list {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .service-card {
    padding: 20px;
  }

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

  .step-item {
    padding: 20px;
  }

  /* 方法摘要 */
  .method-summary {
    grid-template-columns: 1fr;
    gap: 24px;
    padding-top: 40px;
    padding-bottom: 40px;
  }

  .method-figure {
    order: -1;
  }

  .method-figure img {
    height: 220px;
  }

  /* 服务边界提示 */
  .boundary-list {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  /* 内页标题区 */
  .page-header {
    padding-top: 16px;
  }

  .page-title {
    font-size: 24px;
  }

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

  .page-title-area .page-lead {
    font-size: 15px;
  }

  /* 证据链类型 */
  .evidence-types {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  /* 方法示意图片 */
  .method-figure img {
    height: 220px;
  }

  /* 合作流程页 */
  .timeline-item {
    padding-left: 36px;
  }

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

  .delivery-figure img {
    height: 220px;
  }

  /* 常见问题页 */
  .faq-cats {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .faq-cats-image img {
    height: 200px;
  }

  /* 合规指南页 */
  .checklist li {
    padding: 16px 16px 16px 52px;
  }

  .content-figure img {
    height: 220px;
  }

  /* 服务边界页 */
  .scope-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

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

  .scope-image img {
    height: 220px;
  }

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

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

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

  .footer-bottom {
    padding: 12px;
  }

  /* 404 */
  .error-main {
    padding: 48px 12px;
  }

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

/* ---------- 超小屏适配 ---------- */
@media (max-width: 360px) {
  .brand-link {
    font-size: 16px;
  }

  .hero-text h1 {
    font-size: 22px;
  }

  .hero-figure img,
  .method-figure img,
  .delivery-figure img,
  .content-figure img,
  .scope-image img {
    height: 180px;
  }

  .faq-item summary,
  .faq-list details summary {
    padding: 14px 40px 14px 16px;
    font-size: 14px;
  }
}

/* ---------- 打印样式 ---------- */
@media print {
  .site-header,
  .site-footer,
  .nav-toggle,
  .related-links,
  .breadcrumb {
    display: none;
  }

  body {
    background-color: #FFFFFF;
  }

  .site-main {
    padding: 0;
  }
}