/* ==========================================================================
   黑料吃瓜网 - 整站样式表
   版本：1.0
   说明：本样式表覆盖全站 6 个页面与 404 页，遵循百科索引风视觉方向
   ========================================================================== */

/* ==========================================================================
   Base - 基础变量、重置与全局字体
   ========================================================================== */

:root {
  --color-page-bg: #f6f6f4;
  --color-text: #1a1a1a;
  --color-text-secondary: #6a6a6a;
  --color-link: #1a5fb4;
  --color-link-hover: #0f3d7a;
  --color-border: #e3e3e0;
  --color-white: #ffffff;
  --color-black: #1a1a1a;
  --font-sans: -apple-system, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: ui-monospace, 'SF Mono', 'Cascadia Mono', 'Roboto Mono', Consolas, monospace;
  --container-width: 1140px;
  --content-width: 760px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
}

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

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

body {
  margin: 0;
  padding: 0;
  background-color: var(--color-page-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

h1,
h2,
h3,
h4,
h5,
h6 {
  margin: 0 0 0.5em;
  line-height: 1.4;
  font-weight: 600;
  color: var(--color-text);
}

h1 {
  font-size: 32px;
  font-weight: 700;
  line-height: 1.3;
}

h2 {
  font-size: 24px;
  font-weight: 600;
}

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

p {
  margin: 0 0 1em;
}

ul,
ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

table {
  border-collapse: collapse;
  width: 100%;
}

figure {
  margin: 0;
}

/* 辅助类：视觉隐藏但保留可访问性 */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ==========================================================================
   Layout - 全站布局骨架
   ========================================================================== */

/* 站点主体容器 */
.site-body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* 页头 */
.site-header {
  background-color: var(--color-white);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 64px;
}

.site-brand {
  margin: 0;
  font-size: 20px;
  font-weight: 700;
  line-height: 1.3;
  white-space: nowrap;
}

.site-brand a {
  color: var(--color-text);
  text-decoration: none;
}

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

/* 主导航 */
.site-nav {
  display: flex;
  align-items: center;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav-list li {
  margin: 0;
}

.nav-list a {
  display: block;
  padding: 8px 14px;
  color: var(--color-text);
  text-decoration: none;
  font-size: 15px;
  line-height: 1.5;
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.nav-list a:hover {
  background-color: rgba(26, 95, 180, 0.08);
  color: var(--color-link);
}

.nav-list a.is-current {
  background-color: rgba(26, 95, 180, 0.1);
  color: var(--color-link);
  font-weight: 600;
}

/* 移动端导航按钮（默认隐藏） */
.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  cursor: pointer;
  font-size: 14px;
  color: var(--color-text);
  line-height: 1.4;
  min-height: 44px;
  min-width: 44px;
}

.nav-toggle-label {
  display: block;
}

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

/* 首页主区 */
.home-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px 48px;
}

/* 内页主区 */
.inner-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px 56px;
  width: 100%;
}

/* 页脚 */
.site-footer {
  background-color: var(--color-white);
  border-top: 1px solid var(--color-border);
  padding: 48px 24px 24px;
  width: 100%;
}

.footer-inner {
  max-width: var(--container-width);
  margin: 0 auto;
}

.footer-brand {
  margin-bottom: 32px;
}

.footer-site-name {
  font-size: 20px;
  font-weight: 700;
  margin: 0 0 8px;
}

.footer-tagline {
  font-size: 15px;
  color: var(--color-text-secondary);
  margin: 0;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
  padding: 32px 0;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.footer-links-group h2 {
  font-size: 16px;
  font-weight: 600;
  margin: 0 0 12px;
  color: var(--color-text);
}

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

.footer-links-group li {
  margin-bottom: 8px;
}

.footer-links-group a {
  font-size: 14px;
  color: var(--color-text-secondary);
  text-decoration: none;
}

.footer-links-group a:hover {
  color: var(--color-link);
  text-decoration: underline;
}

.footer-note {
  padding: 24px 0 16px;
}

.footer-note p {
  font-size: 13px;
  color: var(--color-text-secondary);
  margin: 0 0 8px;
  line-height: 1.7;
}

.footer-copyright {
  font-size: 13px;
  color: var(--color-text-secondary);
  margin: 0;
  padding-top: 16px;
  border-top: 1px solid var(--color-border);
}

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

/* 面包屑 */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin: 24px 0 16px;
  font-size: 14px;
}

.breadcrumb a {
  color: var(--color-link);
  text-decoration: none;
}

.breadcrumb a:hover {
  text-decoration: underline;
}

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

.breadcrumb-sep {
  color: var(--color-text-secondary);
  font-family: var(--font-mono);
}

/* 页面标题区 */
.page-header {
  margin-bottom: 32px;
}

.page-title {
  font-size: 32px;
  font-weight: 700;
  line-height: 1.3;
  margin: 0 0 12px;
}

.page-description {
  font-size: 16px;
  color: var(--color-text-secondary);
  max-width: var(--content-width);
  line-height: 1.8;
  margin: 0;
}

/* 区块标题（内页通用） */
.section-title {
  font-size: 24px;
  font-weight: 600;
  margin: 0 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border);
}

/* 内容区通用段落 */
.page-intro p,
.services-intro p,
.scenario-intro p {
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-text);
}

/* 侧边栏 */
.sidebar {
  min-width: 0;
}

.sidebar-block {
  margin-bottom: 32px;
  padding: 20px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.sidebar-block h2 {
  font-size: 18px;
  font-weight: 600;
  margin: 0 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border);
}

.sidebar-links {
  margin: 0;
  padding: 0;
  list-style: none;
}

.sidebar-links li {
  margin-bottom: 12px;
  padding-left: 16px;
  position: relative;
}

.sidebar-links li::before {
  content: "›";
  position: absolute;
  left: 0;
  top: 0;
  color: var(--color-link);
  font-family: var(--font-mono);
}

.sidebar-links a {
  font-size: 14px;
  color: var(--color-link);
  text-decoration: none;
  line-height: 1.6;
}

.sidebar-links a:hover {
  text-decoration: underline;
}

/* 延伸阅读（场景页、方法页等） */
.related-links {
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
}

.related-links h2 {
  font-size: 18px;
  font-weight: 600;
  margin: 0 0 16px;
}

.related-links-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.related-links-list a {
  display: block;
  padding: 12px 16px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-link);
  text-decoration: none;
  font-size: 14px;
  line-height: 1.5;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.related-links-list a:hover {
  border-color: var(--color-link);
  box-shadow: 0 2px 8px rgba(26, 95, 180, 0.08);
}

/* 图文行配图 */
figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

figcaption {
  font-size: 13px;
  color: var(--color-text-secondary);
  padding: 8px 0 0;
  line-height: 1.6;
}

/* 资料列表（方法页与流程页共用） */
.materials-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.materials-list li {
  padding: 12px 0;
  border-bottom: 1px solid var(--color-border);
  font-size: 14px;
  line-height: 1.7;
}

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

.materials-list strong {
  display: block;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 4px;
}

/* 详情折叠 */
.faq-item {
  border-bottom: 1px solid var(--color-border);
}

.faq-item summary {
  padding: 16px 0;
  cursor: pointer;
  font-size: 16px;
  font-weight: 500;
  color: var(--color-text);
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  transition: color var(--transition-fast);
}

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

.faq-item summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 20px;
  color: var(--color-link);
  flex-shrink: 0;
  transition: transform var(--transition-fast);
}

.faq-item[open] summary::after {
  content: "−";
  transform: rotate(180deg);
}

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

.faq-item p {
  padding: 0 0 16px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-text-secondary);
}

/* ==========================================================================
   Pages - 首页各模块
   ========================================================================== */

/* 首屏信息带 */
.hero-band {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: center;
  padding: 48px 0 40px;
  border-bottom: 1px solid var(--color-border);
}

.hero-media {
  overflow: hidden;
  border-radius: var(--radius-md);
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
}

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

.hero-info {
  min-width: 0;
}

.hero-info h1 {
  font-size: 32px;
  font-weight: 700;
  margin: 0 0 16px;
  line-height: 1.3;
}

.hero-lead {
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-text-secondary);
  margin: 0 0 24px;
}

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

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

.hero-col h2 {
  font-size: 16px;
  font-weight: 600;
  margin: 0 0 8px;
  color: var(--color-text);
}

.hero-col p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-secondary);
  margin: 0;
}

.hero-col a {
  color: var(--color-link);
  text-decoration: underline;
  font-size: 14px;
  word-break: break-word;
}

/* 通用区块 */
.section {
  padding: 40px 0;
  border-bottom: 1px solid var(--color-border);
}

.section:last-child {
  border-bottom: none;
}

.section h2 {
  font-size: 24px;
  font-weight: 600;
  margin: 0 0 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border);
}

.section-lead {
  font-size: 15px;
  color: var(--color-text-secondary);
  margin: 0 0 24px;
  max-width: var(--content-width);
}

.section-link {
  margin: 24px 0 0;
  font-size: 15px;
}

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

/* 服务项目总览 - 混合列表 */
.service-mix-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.service-item {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px 24px;
}

.service-item h3 {
  font-size: 18px;
  font-weight: 600;
  margin: 0 0 8px;
}

.service-item p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-secondary);
  margin: 0 0 6px;
}

.service-item p:last-child {
  margin-bottom: 0;
}

.service-item a {
  color: var(--color-link);
  text-decoration: underline;
  font-size: 14px;
}

/* 重点项目 - 图文行 */
.service-featured {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 24px;
  padding: 0;
  overflow: hidden;
}

.service-media {
  overflow: hidden;
  background-color: var(--color-page-bg);
  min-height: 100%;
}

.service-media img {
  width: 100%;
  height: 100%;
  min-height: 180px;
  object-fit: cover;
}

.service-copy {
  padding: 20px 24px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.service-copy h3 {
  font-size: 18px;
  font-weight: 600;
  margin: 0 0 8px;
}

.service-copy p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-secondary);
  margin: 0 0 8px;
}

.service-copy p:last-child {
  margin-bottom: 0;
}

.service-copy a {
  color: var(--color-link);
  text-decoration: underline;
  font-size: 14px;
}

/* 适用场景摘要 */
.scenario-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

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

.scenario-card img {
  width: 100%;
  height: 140px;
  object-fit: cover;
}

.scenario-card h3 {
  font-size: 16px;
  font-weight: 600;
  margin: 16px 16px 8px;
}

.scenario-card p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-secondary);
  margin: 0 16px 12px;
}

.scenario-card p:last-of-type {
  margin-bottom: 16px;
}

.scenario-card a {
  color: var(--color-link);
  text-decoration: underline;
  font-size: 14px;
  margin: 0 16px 16px;
  display: inline-block;
}

/* 合作流程预览 */
.process-steps {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: process-step;
}

.process-step {
  position: relative;
  padding: 20px 16px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  counter-increment: process-step;
}

.process-step::before {
  content: counter(process-step, decimal-leading-zero);
  display: block;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--color-link);
  margin-bottom: 8px;
}

.process-step h3 {
  font-size: 16px;
  font-weight: 600;
  margin: 0 0 8px;
}

.process-step p {
  font-size: 13px;
  line-height: 1.6;
  color: var(--color-text-secondary);
  margin: 0;
}

/* 常见问题摘要 */
.faq-list {
  max-width: var(--content-width);
}

/* 站内导航索引 */
.site-index {
  padding-bottom: 24px;
}

.index-group {
  margin-bottom: 24px;
}

.index-group h3 {
  font-size: 16px;
  font-weight: 600;
  margin: 0 0 12px;
  color: var(--color-text);
}

.index-group ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px 24px;
}

.index-group li {
  margin: 0;
}

.index-group a {
  font-size: 14px;
  color: var(--color-link);
  text-decoration: none;
  line-height: 1.6;
}

.index-group a:hover {
  text-decoration: underline;
}

/* ==========================================================================
   Pages - 内页布局系统
   ========================================================================== */

/* 内页通用布局：主内容 + 右侧栏 */
.page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 40px;
  align-items: start;
}

.layout-with-aside {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 40px;
  align-items: start;
}

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

/* 左侧栏布局（方法页） */
.sidebar-left {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: 40px;
  align-items: start;
}

.sidebar-left .sidebar {
  order: 0;
}

.sidebar-left .content-area {
  order: 1;
  min-width: 0;
}

.sidebar-inner {
  position: sticky;
  top: 24px;
}

.sidebar-inner h2 {
  font-size: 18px;
  font-weight: 600;
  margin: 0 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border);
}

.sidebar-nav {
  margin: 0 0 24px;
  padding: 0;
  list-style: none;
}

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

.sidebar-nav a {
  display: block;
  padding: 8px 12px;
  color: var(--color-text);
  text-decoration: none;
  font-size: 14px;
  line-height: 1.5;
  border-left: 2px solid transparent;
  transition: color var(--transition-fast), border-color var(--transition-fast), background-color var(--transition-fast);
}

.sidebar-nav a:hover {
  color: var(--color-link);
  border-left-color: var(--color-link);
  background-color: rgba(26, 95, 180, 0.04);
}

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

.sidebar-note h3 {
  font-size: 15px;
  font-weight: 600;
  margin: 0 0 8px;
}

.sidebar-note p {
  font-size: 13px;
  line-height: 1.7;
  color: var(--color-text-secondary);
  margin: 0;
}

/* ==========================================================================
   Pages - 服务项目页（hlcgw/services.html）
   ========================================================================== */

.services-intro {
  margin-bottom: 40px;
}

.intro-figure {
  margin: 24px 0;
  overflow: hidden;
  border-radius: var(--radius-md);
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
}

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

.intro-figure figcaption {
  padding: 12px 16px;
}

.services-matrix {
  margin-bottom: 40px;
}

.table-wrap {
  overflow-x: auto;
  margin: 16px 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background-color: var(--color-white);
}

.services-table {
  width: 100%;
  min-width: 600px;
  border-collapse: collapse;
  font-size: 14px;
}

.services-table thead th {
  background-color: var(--color-page-bg);
  padding: 12px 16px;
  text-align: left;
  font-weight: 600;
  border-bottom: 2px solid var(--color-border);
  white-space: nowrap;
}

.services-table tbody td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-border);
  vertical-align: top;
  line-height: 1.7;
}

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

.services-table tbody tr:hover {
  background-color: rgba(26, 95, 180, 0.02);
}

.services-matrix > p:last-of-type {
  margin-top: 16px;
  font-size: 14px;
}

.services-matrix > p:last-of-type a {
  color: var(--color-link);
  text-decoration: underline;
}

/* 交付材料说明 */
.deliverables {
  margin-bottom: 24px;
}

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

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

.deliverables-list h3 {
  font-size: 15px;
  font-weight: 600;
  margin: 0 0 8px;
}

.deliverables-list p {
  font-size: 13px;
  line-height: 1.7;
  color: var(--color-text-secondary);
  margin: 0;
}

.deliverables > p:last-of-type {
  font-size: 14px;
  margin-top: 16px;
}

.deliverables > p:last-of-type a {
  color: var(--color-link);
  text-decoration: underline;
  margin-right: 16px;
}

/* ==========================================================================
   Pages - 适用场景页（hlcgw/scenarios.html）
   ========================================================================== */

.scenario-intro {
  margin-bottom: 32px;
}

.scenario-nav {
  margin-bottom: 40px;
}

.scenario-nav-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.scenario-nav-list a {
  display: block;
  padding: 10px 20px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-link);
  text-decoration: none;
  font-size: 14px;
  line-height: 1.5;
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.scenario-nav-list a:hover {
  border-color: var(--color-link);
  background-color: rgba(26, 95, 180, 0.04);
}

.scenario-list {
  margin-bottom: 24px;
}

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

.scenario-item-media {
  overflow: hidden;
  border-radius: var(--radius-sm);
  background-color: var(--color-page-bg);
}

.scenario-item-media img {
  width: 100%;
  height: 180px;
  object-fit: cover;
}

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

.scenario-item-content h3 {
  font-size: 18px;
  font-weight: 600;
  margin: 0 0 12px;
}

.scenario-item-content p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--color-text);
  margin: 0 0 10px;
}

.scenario-item-content p:last-child {
  margin-bottom: 0;
}

.scenario-item-content a {
  color: var(--color-link);
  text-decoration: underline;
  font-size: 14px;
  display: inline-block;
  margin-top: 8px;
}

/* ==========================================================================
   Pages - 工作方法页（hlcgw/methods.html）
   ========================================================================== */

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

.method-item {
  margin-bottom: 24px;
  padding: 20px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  scroll-margin-top: 24px;
}

.method-item h3 {
  font-size: 18px;
  font-weight: 600;
  margin: 0 0 12px;
}

.method-item p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--color-text);
  margin: 0 0 10px;
}

.method-item p:last-child {
  margin-bottom: 0;
}

.method-figure {
  margin: 32px 0;
  overflow: hidden;
  border-radius: var(--radius-md);
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
}

.method-figure img {
  width: 100%;
  height: 260px;
  object-fit: cover;
}

.method-figure figcaption {
  padding: 12px 16px;
}

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

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

.principles-list li {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  padding: 14px 0;
  border-bottom: 1px solid var(--color-border);
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text);
}

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

.principle-index {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-link);
  flex-shrink: 0;
  min-width: 28px;
}

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

.materials-section .materials-list li {
  font-size: 14px;
}

.materials-section .materials-list strong {
  font-size: 15px;
}

/* 方法页延伸阅读 */
.methods-section + .related-links,
.content-area > .related-links {
  margin-top: 32px;
}

.content-area > .related-links ul {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.content-area > .related-links a {
  display: block;
  padding: 12px 16px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-link);
  text-decoration: none;
  font-size: 14px;
  line-height: 1.5;
}

.content-area > .related-links a:hover {
  border-color: var(--color-link);
}

/* ==========================================================================
   Pages - 合作流程页（hlcgw/process.html）
   ========================================================================== */

.page-intro {
  margin-bottom: 32px;
}

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

.timeline-list {
  margin: 0;
  padding: 0;
  list-style: none;
  position: relative;
}

.timeline-list::before {
  content: "";
  position: absolute;
  left: 16px;
  top: 0;
  bottom: 0;
  width: 2px;
  background-color: var(--color-border);
}

.timeline-item {
  position: relative;
  padding: 0 0 32px 48px;
}

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

.timeline-item::before {
  content: "";
  position: absolute;
  left: 10px;
  top: 6px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background-color: var(--color-white);
  border: 3px solid var(--color-link);
  z-index: 1;
}

.timeline-item h3 {
  font-size: 18px;
  font-weight: 600;
  margin: 0 0 8px;
}

.timeline-item p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--color-text);
  margin: 0 0 8px;
}

.timeline-item .handoff {
  font-size: 13px;
  color: var(--color-text-secondary);
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  display: inline-block;
  margin-top: 4px;
}

.process-figure {
  margin: 32px 0;
  overflow: hidden;
  border-radius: var(--radius-md);
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
}

.process-figure img {
  width: 100%;
  height: 240px;
  object-fit: cover;
}

.process-figure figcaption {
  padding: 12px 16px;
}

/* 流程页侧栏资料列表 */
.sidebar .materials-list li {
  font-size: 13px;
}

.sidebar .materials-list strong {
  font-size: 14px;
}

/* ==========================================================================
   Pages - 常见问题页（hlcgw/faq.html）
   ========================================================================== */

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

.faq-topic-image {
  margin: 24px 0 40px;
  overflow: hidden;
  border-radius: var(--radius-md);
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
}

.faq-topic-image img {
  width: 100%;
  height: 220px;
  object-fit: cover;
}

.faq-topic-image figcaption {
  padding: 12px 16px;
}

.faq-groups {
  margin-bottom: 40px;
}

.faq-group {
  margin-bottom: 40px;
}

.faq-group h3 {
  font-size: 20px;
  font-weight: 600;
  margin: 0 0 8px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border);
}

.group-desc {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin: 0 0 16px;
}

.faq-group .faq-item summary {
  padding: 14px 0;
}

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

/* FAQ 页延伸阅读 */
.related-reading {
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
}

.related-reading h2 {
  font-size: 18px;
  font-weight: 600;
  margin: 0 0 16px;
}

.related-reading .related-links {
  margin: 0;
  padding: 0;
  border: none;
}

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

/* 底部导航式延伸阅读 */
.faq-groups + .related-links {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
  padding-top: 16px;
  border-top: 1px solid var(--color-border);
}

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

.related-links-item {
  font-size: 14px;
  color: var(--color-link);
  text-decoration: underline;
  padding: 4px 8px;
}

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

/* ==========================================================================
   Pages - 404 错误页
   ========================================================================== */

.error-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 80px 24px;
  width: 100%;
}

.error-section {
  max-width: 560px;
  margin: 0 auto;
  text-align: center;
}

.error-code {
  font-family: var(--font-mono);
  font-size: 72px;
  font-weight: 700;
  color: var(--color-link);
  margin: 0 0 16px;
  line-height: 1;
}

.error-section h1 {
  font-size: 28px;
  font-weight: 600;
  margin: 0 0 16px;
}

.error-desc {
  font-size: 15px;
  color: var(--color-text-secondary);
  margin: 0 0 24px;
}

.error-action {
  margin: 0 0 16px;
}

.btn-back {
  display: inline-block;
  padding: 12px 32px;
  background-color: var(--color-link);
  color: var(--color-white);
  text-decoration: none;
  border-radius: var(--radius-md);
  font-size: 15px;
  font-weight: 500;
  line-height: 1.5;
  transition: background-color var(--transition-fast);
}

.btn-back:hover {
  background-color: var(--color-link-hover);
  color: var(--color-white);
}

.error-tip {
  font-size: 13px;
  color: var(--color-text-secondary);
  margin: 0;
}

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

/* 平板（≤1024px） */
@media (max-width: 1024px) {
  .hero-band {
    grid-template-columns: 1fr;
    gap: 24px;
  }

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

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

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

  .process-steps {
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
  }

  .process-step:nth-child(4),
  .process-step:nth-child(5) {
    grid-column: span 1;
  }

  .page-layout,
  .layout-with-aside {
    grid-template-columns: minmax(0, 1fr) 240px;
    gap: 24px;
  }

  .sidebar-left {
    grid-template-columns: 220px minmax(0, 1fr);
    gap: 24px;
  }

  .scenario-item {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: 16px;
  }

  .service-featured {
    grid-template-columns: 160px 1fr;
    gap: 16px;
  }
}

/* 手机（≤768px） */
@media (max-width: 768px) {
  .header-inner {
    padding: 12px 16px;
    flex-wrap: wrap;
    gap: 12px;
    position: relative;
  }

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

  .nav-toggle {
    display: block;
    margin-left: auto;
  }

  .site-nav {
    width: 100%;
    order: 3;
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    width: 100%;
    padding-top: 8px;
  }

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

  .nav-list a {
    padding: 12px 16px;
    font-size: 15px;
  }

  .home-main,
  .inner-main {
    padding: 0 16px 40px;
  }

  .page-header {
    margin-bottom: 24px;
  }

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

  .breadcrumb {
    margin: 16px 0 12px;
    font-size: 13px;
  }

  /* 内页布局切换为单列 */
  .page-layout,
  .layout-with-aside,
  .sidebar-left {
    display: block;
  }

  .sidebar {
    margin-top: 32px;
    width: 100%;
  }

  .sidebar-left .sidebar {
    margin-top: 32px;
    order: 2;
  }

  .sidebar-left .content-area {
    order: 1;
  }

  .sidebar-inner {
    position: static;
  }

  /* 首页模块 */
  .hero-band {
    padding: 32px 0 24px;
  }

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

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

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

  .hero-col {
    padding: 14px 16px;
  }

  .section {
    padding: 32px 0;
  }

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

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

  .service-media img {
    height: 140px;
    min-height: 0;
  }

  .service-copy {
    padding: 16px;
  }

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

  .scenario-card img {
    height: 120px;
  }

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

  .process-step {
    padding: 16px;
  }

  .process-step::before {
    font-size: 13px;
    margin-bottom: 6px;
  }

  .index-group ul {
    grid-template-columns: 1fr;
  }

  /* 内页模块 */
  .intro-figure img {
    height: 200px;
  }

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

  .services-table {
    min-width: 520px;
  }

  .scenario-nav-list {
    flex-direction: column;
    gap: 8px;
  }

  .scenario-nav-list a {
    width: 100%;
  }

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

  .scenario-item-media img {
    height: 140px;
  }

  .method-item {
    padding: 16px;
  }

  .method-figure img {
    height: 180px;
  }

  .principles-list li {
    gap: 12px;
    padding: 12px 0;
  }

  .content-area > .related-links ul {
    grid-template-columns: 1fr;
  }

  .timeline-item {
    padding-left: 40px;
  }

  .timeline-list::before {
    left: 12px;
  }

  .timeline-item::before {
    left: 6px;
    width: 12px;
    height: 12px;
  }

  .process-figure img {
    height: 180px;
  }

  .faq-topic-image img {
    height: 160px;
  }

  .faq-group h3 {
    font-size: 18px;
  }

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

  .related-reading .related-links-list {
    grid-template-columns: 1fr;
  }

  .faq-groups + .related-links {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  /* 页脚 */
  .site-footer {
    padding: 32px 16px 16px;
  }

  .footer-links {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 24px 0;
  }

  .footer-brand {
    margin-bottom: 24px;
  }

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

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

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

  .btn-back {
    width: 100%;
    text-align: center;
  }
}

/* 小屏手机（≤480px） */
@media (max-width: 480px) {
  .site-brand {
    font-size: 16px;
  }

  .nav-toggle {
    padding: 6px 10px;
    font-size: 13px;
  }

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

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

  .section h2 {
    font-size: 19px;
  }

  .section-lead {
    font-size: 14px;
  }

  .service-copy h3,
  .scenario-card h3,
  .process-step h3 {
    font-size: 16px;
  }

  .service-copy p,
  .scenario-card p,
  .process-step p {
    font-size: 13px;
  }

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

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

  .scenario-item-content h3,
  .method-item h3,
  .timeline-item h3 {
    font-size: 16px;
  }

  .scenario-item-content p,
  .method-item p,
  .timeline-item p {
    font-size: 13px;
  }

  .timeline-item .handoff {
    font-size: 12px;
    padding: 6px 10px;
  }

  .faq-item summary {
    font-size: 15px;
    padding: 14px 0;
  }

  .faq-item p {
    font-size: 13px;
  }

  .group-desc {
    font-size: 13px;
  }

  .footer-site-name {
    font-size: 18px;
  }

  .footer-tagline {
    font-size: 14px;
  }
}