/* ==========================================================================
   base — 基础变量、重置、全局字体与通用元素
   ========================================================================== */

:root {
  --color-primary: #2563eb;
  --color-primary-dark: #1d4ed8;
  --color-accent: #0ea5e9;
  --color-bg: #f8fafc;
  --color-card: #ffffff;
  --color-emphasis: #f59e0b;
  --color-text: #1e293b;
  --color-text-light: #475569;
  --color-text-muted: #64748b;
  --color-border: #e2e8f0;
  --color-border-light: #f1f5f9;
  --color-header-bg: #ffffff;
  --color-footer-bg: #0f172a;
  --color-footer-text: #cbd5e1;
  --color-footer-heading: #f1f5f9;
  --color-footer-link: #94a3b8;

  --font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-size-base: 16px;
  --line-height-base: 1.8;
  --font-size-h1: 32px;
  --font-size-h2: 24px;
  --font-size-h3: 18px;

  --container-width: 1160px;
  --content-width: 720px;
  --sidebar-width: 320px;

  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;

  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 8px 24px rgba(15, 23, 42, 0.1);

  --header-height: 72px;
  --transition-base: 0.2s ease;
}

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

html {
  font-size: var(--font-size-base);
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

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

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

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-base);
}

a:hover {
  color: var(--color-primary-dark);
}

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

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

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

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

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

p {
  margin-bottom: 0.5em;
}

figure {
  margin: 0;
}

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

/* ==========================================================================
   layout — 全站共享布局骨架：页头、导航、面包屑、页脚、通用容器
   ========================================================================== */

.site-body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* ---------- 页头 ---------- */

.site-header {
  background-color: var(--color-header-bg);
  border-bottom: 1px solid var(--color-border-light);
  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-logo {
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex-shrink: 0;
}

.brand-name {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.3;
  letter-spacing: 0.5px;
}

.brand-tag {
  font-size: 12px;
  color: var(--color-text-muted);
  line-height: 1.4;
}

/* ---------- 主导航 ---------- */

.site-nav {
  margin-left: auto;
}

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

.nav-item {
  position: relative;
}

.nav-link {
  display: block;
  padding: 10px 16px;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text-light);
  border-radius: var(--radius-sm);
  transition: color var(--transition-base), background-color var(--transition-base);
}

.nav-link:hover {
  color: var(--color-primary);
  background-color: var(--color-bg);
}

.nav-item.is-current .nav-link {
  color: var(--color-primary);
  font-weight: 600;
}

.nav-item.is-current .nav-link::after {
  content: "";
  display: block;
  height: 2px;
  background-color: var(--color-primary);
  border-radius: 1px;
  margin-top: 4px;
}

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

.nav-toggle:hover {
  background-color: var(--color-bg);
}

.nav-toggle-bar {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-text);
  border-radius: 1px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

/* ---------- 面包屑 ---------- */

.breadcrumb {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 16px 24px 0;
  font-size: 14px;
  color: var(--color-text-muted);
}

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

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

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

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

/* ---------- 页脚 ---------- */

.site-footer {
  background-color: var(--color-footer-bg);
  color: var(--color-footer-text);
  margin-top: auto;
}

.footer-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 56px 24px 32px;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
}

.footer-brand {
  padding-right: 24px;
}

.footer-logo {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-footer-heading);
  margin-bottom: 12px;
}

.footer-desc {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-footer-text);
}

.footer-col h4 {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-footer-heading);
  margin-bottom: 16px;
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 10px;
}

.footer-links a {
  font-size: 14px;
  color: var(--color-footer-link);
}

.footer-links a:hover {
  color: var(--color-footer-heading);
}

.footer-bottom {
  border-top: 1px solid rgba(148, 163, 184, 0.2);
  padding: 20px 24px;
  text-align: center;
  font-size: 13px;
  color: var(--color-footer-link);
}

/* ---------- 主内容通用 ---------- */

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

.inner-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px 64px;
  width: 100%;
}

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

.page-title {
  font-size: var(--font-size-h1);
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.4;
}

.page-description {
  margin-top: 12px;
  font-size: 16px;
  color: var(--color-text-light);
  max-width: 720px;
}

.page-subtitle {
  margin-top: 8px;
  font-size: 15px;
  color: var(--color-text-muted);
}

/* ---------- 侧边栏布局 ---------- */

.layout-shell {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  width: 100%;
}

.layout-shell.sidebar-left {
  grid-template-columns: var(--sidebar-width) minmax(0, 1fr);
  align-items: start;
  padding-top: 24px;
}

.layout-shell.sidebar-left .site-main {
  min-width: 0;
}

/* ==========================================================================
   components — 通用组件：按钮、卡片、列表、表格、手风琴、流程、相关链接
   ========================================================================== */

/* ---------- 按钮 ---------- */

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  background-color: var(--color-primary);
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background-color var(--transition-base), transform var(--transition-base);
}

.btn-primary:hover {
  background-color: var(--color-primary-dark);
  color: #fff;
  transform: translateY(-1px);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  background-color: transparent;
  color: var(--color-primary);
  font-size: 15px;
  font-weight: 600;
  border: 1px solid var(--color-primary);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background-color var(--transition-base), color var(--transition-base);
}

.btn-secondary:hover {
  background-color: var(--color-primary);
  color: #fff;
}

/* ---------- 区块标题 ---------- */

.section-header {
  text-align: center;
  margin-bottom: 40px;
}

.section-title {
  font-size: var(--font-size-h2);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 12px;
}

.section-desc {
  font-size: 15px;
  color: var(--color-text-muted);
  max-width: 640px;
  margin: 0 auto;
  line-height: 1.7;
}

/* ---------- 图片媒体 ---------- */

.content-media {
  border-radius: var(--radius-lg);
  overflow: hidden;
  background-color: var(--color-border-light);
}

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

.content-media figcaption {
  padding: 10px 16px;
  font-size: 13px;
  color: var(--color-text-muted);
  background-color: var(--color-card);
  border-top: 1px solid var(--color-border-light);
}

/* ---------- 相关链接 ---------- */

.related-links {
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

.related-links-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
  margin-right: 8px;
}

.related-links-item {
  display: inline-block;
  padding: 6px 14px;
  font-size: 14px;
  color: var(--color-primary);
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 20px;
  transition: background-color var(--transition-base), border-color var(--transition-base);
}

.related-links-item:hover {
  background-color: var(--color-card);
  border-color: var(--color-primary);
}

/* ---------- 侧边栏通用 ---------- */

.sidebar {
  position: sticky;
  top: calc(var(--header-height) + 24px);
}

.sidebar-inner {
  background-color: var(--color-card);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: 24px;
}

.sidebar-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border-light);
}

.sidebar-nav {
  list-style: none;
}

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

.sidebar-nav a {
  display: block;
  padding: 8px 12px;
  font-size: 14px;
  color: var(--color-text-light);
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-base), color var(--transition-base);
}

.sidebar-nav a:hover {
  color: var(--color-primary);
  background-color: var(--color-bg);
}

.sidebar-nav a.is-active {
  color: var(--color-primary);
  background-color: var(--color-bg);
  font-weight: 600;
}

.sidebar-note {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--color-border-light);
  font-size: 13px;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* ---------- 手风琴 ---------- */

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

.faq-item {
  background-color: var(--color-card);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: box-shadow var(--transition-base);
}

.faq-item:hover {
  box-shadow: var(--shadow-sm);
}

.faq-item 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 var(--transition-base);
}

.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-primary);
  transition: transform var(--transition-base);
}

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

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

.faq-item p {
  padding: 0 20px 16px;
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.75;
}

/* ---------- 表格 ---------- */

.guide-table {
  width: 100%;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin: 24px 0;
}

.guide-table thead {
  background-color: var(--color-bg);
}

.guide-table th,
.guide-table td {
  padding: 12px 16px;
  text-align: left;
  font-size: 14px;
  border-bottom: 1px solid var(--color-border-light);
  vertical-align: top;
}

.guide-table th {
  font-weight: 600;
  color: var(--color-text);
}

.guide-table td {
  color: var(--color-text-light);
  line-height: 1.7;
}

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

/* ==========================================================================
   pages — 首页
   ========================================================================== */

.home-main {
  width: 100%;
}

/* ---------- Hero 首屏 ---------- */

.hero-section {
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border-light);
  padding: 56px 0 64px;
}

.hero-section > .hero-content {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
}

.hero-title {
  font-size: 38px;
  font-weight: 700;
  line-height: 1.35;
  color: var(--color-text);
  margin-bottom: 16px;
}

.hero-lead {
  font-size: 16px;
  color: var(--color-text-light);
  line-height: 1.8;
  margin-bottom: 28px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.hero-media {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  background-color: var(--color-border-light);
}

.hero-media img {
  width: 100%;
  height: 360px;
  object-fit: cover;
  display: block;
}

/* ---------- 常见卡点 ---------- */

.common-needs {
  padding: 64px 24px;
  max-width: var(--container-width);
  margin: 0 auto;
}

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

.need-card {
  background-color: var(--color-card);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: 24px;
  transition: box-shadow var(--transition-base), transform var(--transition-base);
  display: flex;
  flex-direction: column;
}

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

.need-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 10px;
}

.need-card p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
  flex-grow: 1;
}

.card-link {
  display: inline-block;
  margin-top: 16px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-primary);
}

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

/* ---------- 服务项目 ---------- */

.services-overview {
  padding: 64px 24px;
  max-width: var(--container-width);
  margin: 0 auto;
  border-top: 1px solid var(--color-border-light);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.service-block {
  background-color: var(--color-card);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: 28px;
  display: flex;
  flex-direction: column;
  transition: box-shadow var(--transition-base);
}

.service-block:hover {
  box-shadow: var(--shadow-md);
}

.service-icon {
  width: 44px;
  height: 44px;
  background-color: var(--color-bg);
  border-radius: var(--radius-sm);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  color: var(--color-primary);
}

.service-name {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 8px;
}

.service-scene {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 16px;
}

.service-actions {
  list-style: none;
  margin-bottom: 16px;
  flex-grow: 1;
}

.service-actions li {
  font-size: 14px;
  color: var(--color-text-light);
  padding: 4px 0;
  padding-left: 16px;
  position: relative;
  line-height: 1.6;
}

.service-actions li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 6px;
  height: 6px;
  background-color: var(--color-accent);
  border-radius: 50%;
}

.block-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-primary);
}

.block-link:hover {
  color: var(--color-primary-dark);
}

/* ---------- 流程概览 ---------- */

.process-overview {
  padding: 64px 24px;
  max-width: var(--container-width);
  margin: 0 auto;
  border-top: 1px solid var(--color-border-light);
}

.process-steps {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
  margin-bottom: 32px;
  counter-reset: step-counter;
}

.process-step {
  background-color: var(--color-card);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: 24px 20px;
  text-align: center;
  position: relative;
  transition: box-shadow var(--transition-base);
}

.process-step:hover {
  box-shadow: var(--shadow-md);
}

.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background-color: var(--color-emphasis);
  color: #fff;
  font-size: 14px;
  font-weight: 700;
  border-radius: 50%;
  margin-bottom: 12px;
}

.step-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 8px;
}

.step-desc {
  font-size: 13px;
  color: var(--color-text-muted);
  line-height: 1.6;
}

.section-link {
  display: inline-block;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-primary);
  margin-top: 8px;
}

.section-link:hover {
  color: var(--color-primary-dark);
}

/* ---------- 案例预览 ---------- */

.cases-preview {
  padding: 64px 24px;
  max-width: var(--container-width);
  margin: 0 auto;
  border-top: 1px solid var(--color-border-light);
}

.cases-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 32px;
}

.case-card {
  background-color: var(--color-card);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: 24px;
  transition: box-shadow var(--transition-base);
}

.case-card:hover {
  box-shadow: var(--shadow-md);
}

.case-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 12px;
}

.case-card p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 8px;
}

.case-goal::before {
  content: "目标：";
  font-weight: 600;
  color: var(--color-text);
}

.case-idea::before {
  content: "思路：";
  font-weight: 600;
  color: var(--color-text);
}

.case-exec::before {
  content: "执行：";
  font-weight: 600;
  color: var(--color-text);
}

/* ---------- 指南与 FAQ 入口 ---------- */

.guide-faq-entry {
  padding: 64px 24px;
  max-width: var(--container-width);
  margin: 0 auto;
  border-top: 1px solid var(--color-border-light);
}

.guide-faq-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}

.guide-entry,
.faq-entry {
  background-color: var(--color-card);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: 32px;
}

.entry-title {
  font-size: 20px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 20px;
}

.guide-points,
.faq-points {
  list-style: none;
}

.guide-points li,
.faq-points li {
  padding: 8px 0;
  border-bottom: 1px solid var(--color-border-light);
  line-height: 1.6;
}

.guide-points li:last-child,
.faq-points li:last-child {
  border-bottom: none;
}

.guide-points a,
.faq-points a {
  font-size: 14px;
  color: var(--color-text-light);
  display: block;
}

.guide-points a:hover,
.faq-points a:hover {
  color: var(--color-primary);
}

/* ---------- 合作咨询路径 ---------- */

.contact-path {
  padding: 64px 24px;
  max-width: var(--container-width);
  margin: 0 auto;
  border-top: 1px solid var(--color-border-light);
}

.contact-path .path-steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 32px;
  list-style: none;
}

.path-step {
  background-color: var(--color-card);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: 28px;
  text-align: center;
}

.path-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background-color: var(--color-emphasis);
  color: #fff;
  font-size: 16px;
  font-weight: 700;
  border-radius: 50%;
  margin-bottom: 14px;
}

.path-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 8px;
}

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

/* ==========================================================================
   pages — 视频服务页
   ========================================================================== */

.service-directory {
  margin-bottom: 48px;
}

.anchor-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-top: 24px;
}

.anchor-card {
  display: block;
  background-color: var(--color-card);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: 20px;
  transition: box-shadow var(--transition-base), border-color var(--transition-base);
}

.anchor-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--color-primary);
}

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

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

/* 服务详情 */
.service-detail {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 40px;
  align-items: center;
  padding: 48px 0;
  border-top: 1px solid var(--color-border-light);
}

.service-detail:first-of-type {
  border-top: none;
}

.service-reverse .service-media {
  order: 2;
}

.service-reverse .service-content {
  order: 1;
}

.service-media {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  background-color: var(--color-border-light);
}

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

.service-content h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 16px;
}

.service-content > p {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.8;
  margin-bottom: 16px;
}

.service-content h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  margin: 20px 0 10px;
}

.service-content ul {
  list-style: none;
}

.service-content ul li {
  font-size: 14px;
  color: var(--color-text-light);
  padding: 4px 0;
  padding-left: 16px;
  position: relative;
  line-height: 1.7;
}

.service-content ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 6px;
  height: 6px;
  background-color: var(--color-accent);
  border-radius: 50%;
}

/* 协作方式 */
.collaboration {
  margin-top: 48px;
  padding: 48px 0;
  border-top: 1px solid var(--color-border-light);
}

.collaboration-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 32px;
}

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

.collab-card h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 10px;
}

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

.collab-link {
  margin-top: 24px;
  text-align: center;
}

.collab-link a {
  font-size: 15px;
  font-weight: 500;
  color: var(--color-primary);
}

/* ==========================================================================
   pages — 制作流程页
   ========================================================================== */

.process-section {
  padding: 32px 0;
  border-bottom: 1px solid var(--color-border-light);
}

.process-section:last-of-type {
  border-bottom: none;
}

.process-section h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 16px;
}

.section-lead {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.8;
  margin-bottom: 24px;
}

.content-media-inline {
  margin: 24px 0;
}

.content-media-inline img {
  height: 240px;
  object-fit: cover;
  width: 100%;
}

.content-block {
  margin-bottom: 24px;
}

.content-block h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 10px;
}

.content-block p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.75;
}

.content-list {
  list-style: none;
}

.content-list li {
  font-size: 14px;
  color: var(--color-text-light);
  padding: 6px 0;
  padding-left: 18px;
  position: relative;
  line-height: 1.7;
}

.content-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 14px;
  width: 6px;
  height: 6px;
  background-color: var(--color-accent);
  border-radius: 50%;
}

.deliverable {
  background-color: var(--color-bg);
  border-left: 3px solid var(--color-primary);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 14px 20px;
  margin-top: 16px;
}

.deliverable-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 4px;
}

.deliverable p:last-child {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 0;
}

/* ==========================================================================
   pages — 案例参考页
   ========================================================================== */

.page-content {
  max-width: 100%;
}

.case-category-nav {
  margin-bottom: 48px;
}

.category-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-top: 24px;
}

.category-card {
  display: block;
  background-color: var(--color-card);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: 20px;
  transition: box-shadow var(--transition-base), border-color var(--transition-base);
}

.category-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--color-primary);
}

.category-name {
  display: block;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 6px;
}

.category-desc {
  display: block;
  font-size: 13px;
  color: var(--color-text-muted);
  line-height: 1.6;
}

.case-group {
  padding: 40px 0;
  border-top: 1px solid var(--color-border-light);
}

.case-group .section-title {
  text-align: left;
}

.case-group .section-desc {
  text-align: left;
  margin: 0 0 24px;
}

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

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

.case-media {
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: 16px;
  background-color: var(--color-border-light);
}

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

.case-block {
  margin-bottom: 12px;
}

.case-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 4px;
  padding-left: 0;
}

.case-block .case-text {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
}

.case-note {
  padding: 40px 0;
  border-top: 1px solid var(--color-border-light);
}

.case-note-text {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.8;
  margin-bottom: 12px;
}

.case-note-text a {
  font-weight: 500;
  color: var(--color-primary);
}

/* ==========================================================================
   pages — 视频指南页
   ========================================================================== */

.guide-toc {
  position: sticky;
  top: calc(var(--header-height) + 24px);
  background-color: var(--color-card);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: 24px;
}

.toc-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border-light);
}

.toc-list {
  list-style: none;
}

.toc-list li {
  margin-bottom: 4px;
}

.toc-list a {
  display: block;
  padding: 8px 12px;
  font-size: 14px;
  color: var(--color-text-light);
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-base), color var(--transition-base);
}

.toc-list a:hover {
  color: var(--color-primary);
  background-color: var(--color-bg);
}

.guide-intro {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.8;
  margin: 16px 0 32px;
}

.guide-section {
  padding: 32px 0;
  border-bottom: 1px solid var(--color-border-light);
}

.guide-section:last-of-type {
  border-bottom: none;
}

.guide-section h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 16px;
}

.guide-section > p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.75;
  margin-bottom: 16px;
}

.guide-steps {
  list-style: none;
  counter-reset: guide-counter;
}

.guide-steps li {
  padding: 16px 0;
  border-bottom: 1px solid var(--color-border-light);
  position: relative;
  padding-left: 48px;
  counter-increment: guide-counter;
}

.guide-steps li::before {
  content: counter(guide-counter);
  position: absolute;
  left: 0;
  top: 16px;
  width: 32px;
  height: 32px;
  background-color: var(--color-emphasis);
  color: #fff;
  font-size: 14px;
  font-weight: 700;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

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

.guide-steps h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 6px;
}

.guide-steps p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 0;
}

.guide-media {
  margin: 24px 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background-color: var(--color-border-light);
}

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

.checklist {
  list-style: none;
  margin: 24px 0;
}

.checklist li {
  font-size: 14px;
  color: var(--color-text-light);
  padding: 8px 0;
  padding-left: 28px;
  position: relative;
  line-height: 1.7;
  border-bottom: 1px solid var(--color-border-light);
}

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

.checklist li::before {
  content: "✓";
  position: absolute;
  left: 0;
  top: 8px;
  font-size: 16px;
  color: var(--color-primary);
  font-weight: 700;
}

.checklist strong {
  color: var(--color-text);
  font-weight: 600;
}

.guide-section h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  margin: 24px 0 8px;
}

.guide-related {
  margin-top: 32px;
  padding: 20px;
  background-color: var(--color-card);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
}

.guide-related p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.8;
}

.guide-related a {
  font-weight: 500;
  color: var(--color-primary);
}

/* ==========================================================================
   pages — 常见问题页
   ========================================================================== */

.faq-intro {
  margin-bottom: 40px;
  background-color: var(--color-card);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: 28px;
}

.faq-intro p {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.8;
}

.faq-intro a {
  font-weight: 500;
  color: var(--color-primary);
}

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

.faq-group .section-title {
  font-size: 20px;
  margin-bottom: 20px;
}

.faq-cta {
  background-color: var(--color-card);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: 40px;
  text-align: center;
  margin-top: 40px;
}

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

.faq-cta a {
  font-weight: 500;
  color: var(--color-primary);
}

.faq-image {
  width: 100%;
  max-width: 640px;
  height: 220px;
  object-fit: cover;
  border-radius: var(--radius-md);
  margin: 24px auto 0;
}

/* ==========================================================================
   pages — 联系合作页
   ========================================================================== */

.page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) var(--sidebar-width);
  gap: 40px;
  align-items: start;
  margin-top: 32px;
}

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

.content-section {
  padding: 32px 0;
  border-bottom: 1px solid var(--color-border-light);
}

.content-section:last-of-type {
  border-bottom: none;
}

.content-section .section-title {
  text-align: left;
  font-size: 20px;
  margin-bottom: 12px;
}

.content-section .section-lead {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.8;
  margin-bottom: 24px;
}

/* 联系页流程步骤 */
.contact-path .process-steps,
.page-main .process-steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  list-style: none;
}

.contact-path .process-step,
.page-main .process-step {
  background-color: var(--color-card);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: 24px;
  text-align: center;
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background-color: var(--color-emphasis);
  color: #fff;
  font-size: 16px;
  font-weight: 700;
  border-radius: 50%;
  margin-bottom: 12px;
}

.step-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 8px;
}

.step-desc {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
}

/* 需求清单 */
.checklist-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.checklist-col {
  background-color: var(--color-card);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: 24px;
}

.checklist-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 14px;
}

.checklist-list {
  list-style: none;
}

.checklist-list li {
  font-size: 14px;
  color: var(--color-text-light);
  padding: 6px 0;
  padding-left: 18px;
  position: relative;
  line-height: 1.7;
}

.checklist-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 14px;
  width: 6px;
  height: 6px;
  background-color: var(--color-accent);
  border-radius: 50%;
}

/* 沟通方式 */
.communication-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

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

.card-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 10px;
}

.card-desc {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
}

/* 对接提醒 */
.reminder-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

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

.reminder-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 8px;
}

.reminder-desc {
  font-size: 13px;
  color: var(--color-text-light);
  line-height: 1.6;
}

/* 咨询入口 */
.consult-links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.text-link {
  display: inline-block;
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-primary);
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-base), background-color var(--transition-base);
}

.text-link:hover {
  border-color: var(--color-primary);
  background-color: var(--color-bg);
}

/* 联系页侧栏 */
.page-aside {
  position: sticky;
  top: calc(var(--header-height) + 24px);
}

.aside-card {
  background-color: var(--color-card);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-bottom: 24px;
}

.aside-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border-light);
}

.aside-nav {
  list-style: none;
}

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

.aside-nav a {
  display: block;
  padding: 8px 12px;
  font-size: 14px;
  color: var(--color-text-light);
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-base), color var(--transition-base);
}

.aside-nav a:hover {
  color: var(--color-primary);
  background-color: var(--color-bg);
}

.aside-figure {
  border-radius: var(--radius-lg);
  overflow: hidden;
  background-color: var(--color-border-light);
}

.aside-image {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.aside-caption {
  padding: 10px 16px;
  font-size: 13px;
  color: var(--color-text-muted);
  background-color: var(--color-card);
  border-top: 1px solid var(--color-border-light);
}

/* ==========================================================================
   pages — 404
   ========================================================================== */

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

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

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

.error-title {
  font-size: 24px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 12px;
}

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

.error-back {
  display: inline-block;
  padding: 12px 28px;
  background-color: var(--color-primary);
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-md);
  margin-bottom: 24px;
}

.error-back:hover {
  background-color: var(--color-primary-dark);
  color: #fff;
}

.error-help {
  font-size: 14px;
  color: var(--color-text-muted);
}

.error-help a {
  font-weight: 500;
  color: var(--color-primary);
}

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

/* ---------- 平板：≤1024px ---------- */

@media (max-width: 1024px) {
  .hero-section > .hero-content {
    gap: 32px;
  }

  .hero-title {
    font-size: 32px;
  }

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

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

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

  .layout-shell.sidebar-left {
    grid-template-columns: 260px minmax(0, 1fr);
    gap: 24px;
  }

  .page-layout {
    grid-template-columns: minmax(0, 1fr) 280px;
    gap: 24px;
  }

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

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

/* ---------- 手机：≤768px ---------- */

@media (max-width: 768px) {
  .header-inner {
    padding: 0 16px;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background-color: var(--color-header-bg);
    border-bottom: 1px solid var(--color-border-light);
    box-shadow: var(--shadow-md);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    padding: 8px 16px 16px;
    gap: 0;
    display: flex;
  }

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

  .site-nav:has(.nav-list.is-open) {
    max-height: 480px;
  }

  .nav-item {
    border-bottom: 1px solid var(--color-border-light);
  }

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

  .nav-link {
    padding: 14px 12px;
    font-size: 16px;
    border-radius: 0;
  }

  .nav-item.is-current .nav-link::after {
    display: none;
  }

  .nav-item.is-current .nav-link {
    background-color: var(--color-bg);
  }

  /* 面包屑 */
  .breadcrumb {
    padding: 12px 16px 0;
    font-size: 13px;
  }

  /* 主内容 */
  .inner-main {
    padding: 0 16px 48px;
  }

  /* 页头 */
  .page-header {
    padding: 16px 0 8px;
  }

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

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

  /* 侧边栏布局：手机端侧栏回到正文之前 */
  .layout-shell {
    padding: 0 16px;
    display: flex;
    flex-direction: column;
    gap: 24px;
  }

  /* 修复：手机端 H1 在侧栏之前 */
  .layout-shell.sidebar-left {
    display: flex;
    flex-direction: column;
  }

  .layout-shell.sidebar-left .site-main {
    order: 1;
  }

  .layout-shell.sidebar-left > .sidebar,
  .layout-shell.sidebar-left > .guide-toc {
    order: 2;
  }

  /* 但 process.html 的 DOM 里 aside 在 main 之前，需要特殊处理 */
  /* 使用 :has 选择器确保 process 页面的侧栏在 H1 之后 */
  body:has(.layout-shell.sidebar-left > .sidebar) .layout-shell.sidebar-left > .sidebar {
    order: 2;
  }

  body:has(.layout-shell.sidebar-left > .sidebar) .layout-shell.sidebar-left > .site-main {
    order: 1;
  }

  /* 侧栏自身 */
  .sidebar,
  .guide-toc,
  .page-aside {
    position: static;
    width: 100%;
  }

  .sidebar-inner {
    padding: 16px;
  }

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

  .footer-brand {
    grid-column: auto;
    padding-right: 0;
  }

  .footer-bottom {
    padding: 16px;
  }

  /* 首页 Hero */
  .hero-section {
    padding: 32px 0 40px;
  }

  .hero-section > .hero-content {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 0 16px;
  }

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

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

  .hero-actions {
    flex-direction: column;
    gap: 12px;
  }

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

  /* 首页区块通用 */
  .common-needs,
  .services-overview,
  .process-overview,
  .cases-preview,
  .guide-faq-entry,
  .contact-path {
    padding: 40px 16px;
  }

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

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

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

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

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

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

  /* 服务页 */
  .anchor-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }

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

  .service-reverse .service-media {
    order: 1;
  }

  .service-reverse .service-content {
    order: 2;
  }

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

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

  /* 案例页 */
  .category-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }

  .case-grid,
  .case-grid.two-col {
    grid-template-columns: 1fr;
  }

  .case-media img {
    height: 160px;
  }

  /* 指南页 */
  .guide-table {
    overflow-x: auto;
    display: block;
  }

  .guide-table table {
    min-width: 480px;
  }

  .guide-steps li {
    padding-left: 0;
    padding-top: 56px;
  }

  .guide-steps li::before {
    top: 16px;
    left: 0;
  }

  .guide-media img {
    height: 180px;
  }

  /* FAQ 页 */
  .faq-intro,
  .faq-cta {
    padding: 20px;
  }

  .faq-image {
    height: 160px;
  }

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

  .page-main {
    order: 1;
  }

  .page-aside {
    order: 2;
  }

  .checklist-grid,
  .communication-grid,
  .reminder-grid {
    grid-template-columns: 1fr;
  }

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

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

/* ---------- 小屏手机：≤480px ---------- */

@media (max-width: 480px) {
  .brand-name {
    font-size: 18px;
  }

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

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

  .anchor-card,
  .category-card {
    padding: 14px;
  }

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

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

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

  .service-block {
    padding: 20px;
  }

  .case-card {
    padding: 16px;
  }

  .need-card {
    padding: 16px;
  }

  .process-step {
    padding: 16px;
  }

  .path-step {
    padding: 16px;
  }

  .collab-card,
  .communication-card,
  .reminder-item {
    padding: 16px;
  }

  .checklist-col {
    padding: 16px;
  }

  .deliverable {
    padding: 12px 16px;
  }

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

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

/* ==========================================================================
   interaction — 轻量交互增强（不阻塞初始可见性）
   ========================================================================== */

/* 滚动进入视口动画 */
@media (prefers-reduced-motion: no-preference) {
  .reveal {
    opacity: 1;
    transform: none;
    transition: opacity 0.4s ease, transform 0.4s ease;
  }

  .reveal.is-visible {
    opacity: 1;
    transform: none;
  }
}

/* 回到顶部按钮 */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 44px;
  height: 44px;
  background-color: var(--color-primary);
  color: #fff;
  border: none;
  border-radius: 50%;
  font-size: 20px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-base), visibility var(--transition-base), background-color var(--transition-base);
  z-index: 90;
}

.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background-color: var(--color-primary-dark);
}

/* 服务通知横幅 */
.notice-banner {
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border-light);
  padding: 8px 24px;
  font-size: 14px;
  color: var(--color-text-light);
  text-align: center;
}

.notice-banner .notice-close {
  display: inline-block;
  margin-left: 12px;
  padding: 4px 8px;
  font-size: 13px;
  color: var(--color-primary);
  cursor: pointer;
  background: none;
  border: none;
}

.notice-banner.is-hidden {
  display: none;
}

/* 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;
  }
}