/* ============================================================
   吃瓜网官网 - 整站样式表
   站点：tjtianfuwl.com
   说明：本文件为全站唯一样式来源，覆盖首页、内页、404 页
   ============================================================ */

/* ============================================================
   1. Base - 基础重置与全局变量
   ============================================================ */
:root {
  --color-primary: #0E2A47;
  --color-secondary: #0F766E;
  --color-bg: #F8FAFC;
  --color-text: #1E293B;
  --color-accent: #D97706;
  --color-white: #FFFFFF;
  --color-gray-50: #F1F5F9;
  --color-gray-100: #E2E8F0;
  --color-gray-200: #CBD5E1;
  --color-gray-300: #94A3B8;
  --color-gray-400: #64748B;
  --color-gray-500: #475569;
  --color-gray-600: #334155;
  --color-gray-700: #1E293B;
  --color-gray-800: #0F172A;
  --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", Roboto, Arial, sans-serif;
  --container-width: 1200px;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --transition-base: 0.2s ease;
  --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);
}

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

html {
  font-size: 16px;
  line-height: 1.7;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  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-secondary);
  text-decoration: none;
  transition: color var(--transition-base);
}

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

a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

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

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

h1 {
  font-size: 32px;
}

h2 {
  font-size: 24px;
}

h3 {
  font-size: 18px;
}

p {
  margin-bottom: 1em;
}

p:last-child {
  margin-bottom: 0;
}

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

/* ============================================================
   2. Layout - 全站布局骨架
   ============================================================ */
.site-body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background-color: var(--color-bg);
}

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

/* 统一容器 */
.container,
.header-container,
.footer-container,
.page-container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding-left: 24px;
  padding-right: 24px;
}

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

/* ---------- 3.1 页头 ---------- */
.site-header {
  background-color: var(--color-primary);
  border-bottom: 3px solid var(--color-accent);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 68px;
  padding-top: 12px;
  padding-bottom: 12px;
}

.brand-logo {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-white);
  letter-spacing: 0.02em;
  line-height: 1.2;
  flex-shrink: 0;
}

.brand-logo:hover {
  color: var(--color-gray-100);
}

.site-nav {
  flex-shrink: 0;
}

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

.nav-list li {
  margin: 0;
}

.nav-link {
  display: block;
  padding: 8px 14px;
  color: var(--color-gray-100);
  font-size: 15px;
  font-weight: 500;
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-base), color var(--transition-base);
}

.nav-link:hover {
  color: var(--color-white);
  background-color: rgba(255, 255, 255, 0.1);
}

.nav-link.is-current {
  color: var(--color-white);
  background-color: rgba(255, 255, 255, 0.15);
  font-weight: 600;
}

/* 汉堡按钮 */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  color: var(--color-white);
}

.nav-toggle:hover {
  background-color: rgba(255, 255, 255, 0.1);
}

.nav-toggle-bar {
  display: block;
  width: 22px;
  height: 2px;
  background-color: currentColor;
  margin: 5px auto;
  border-radius: 1px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

/* ---------- 3.2 按钮 ---------- */
.btn-primary,
.btn-secondary,
.btn-text,
.btn-footer {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 24px;
  border-radius: var(--radius-md);
  font-size: 15px;
  font-weight: 600;
  line-height: 1.4;
  cursor: pointer;
  transition: background-color var(--transition-base), border-color var(--transition-base), color var(--transition-base), transform var(--transition-base);
  text-align: center;
}

.btn-primary {
  background-color: var(--color-accent);
  color: var(--color-white);
  border: 2px solid var(--color-accent);
}

.btn-primary:hover {
  background-color: #b25e04;
  border-color: #b25e04;
  color: var(--color-white);
  transform: translateY(-1px);
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-white);
  border: 2px solid var(--color-gray-100);
}

.btn-secondary:hover {
  background-color: rgba(255, 255, 255, 0.1);
  border-color: var(--color-white);
  color: var(--color-white);
}

.btn-text {
  background: none;
  border: none;
  color: var(--color-secondary);
  padding: 8px 12px;
  min-height: 40px;
  font-weight: 600;
}

.btn-text:hover {
  color: var(--color-primary);
  background-color: var(--color-gray-50);
}

.btn-footer {
  background-color: var(--color-accent);
  color: var(--color-white);
  border: 2px solid var(--color-accent);
  min-height: 40px;
  padding: 8px 20px;
  font-size: 14px;
}

.btn-footer:hover {
  background-color: #b25e04;
  border-color: #b25e04;
  color: var(--color-white);
}

/* ---------- 3.3 面包屑 ---------- */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  font-size: 14px;
  color: var(--color-gray-400);
  margin-bottom: 20px;
}

.breadcrumb a {
  color: var(--color-gray-400);
}

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

.breadcrumb-sep {
  color: var(--color-gray-300);
  margin: 0 2px;
}

.breadcrumb-current {
  color: var(--color-gray-600);
  font-weight: 500;
}

/* 面包屑导航（metrics 页专用结构） */
.breadcrumb-nav {
  background-color: var(--color-bg);
  padding: 12px 0;
  border-bottom: 1px solid var(--color-gray-100);
}

.breadcrumb-list {
  display: flex;
  align-items: center;
  gap: 8px;
  list-style: none;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
  font-size: 14px;
  color: var(--color-gray-400);
}

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

.breadcrumb-list li + li::before {
  content: "/";
  color: var(--color-gray-300);
}

.breadcrumb-list a {
  color: var(--color-gray-400);
}

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

/* ---------- 3.4 页脚 ---------- */
.site-footer {
  background-color: var(--color-primary);
  color: var(--color-gray-300);
  margin-top: auto;
}

.footer-container {
  display: grid;
  grid-template-columns: 1fr 1.5fr auto;
  gap: 32px;
  align-items: start;
  padding-top: 40px;
  padding-bottom: 32px;
}

.footer-brand .footer-logo {
  display: inline-block;
  font-size: 20px;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 10px;
}

.footer-brand .footer-logo:hover {
  color: var(--color-gray-100);
}

.footer-brand p {
  font-size: 14px;
  color: var(--color-gray-300);
  line-height: 1.6;
}

.footer-nav .footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  list-style: none;
  padding: 0;
}

.footer-links a {
  display: inline-block;
  padding: 4px 0;
  color: var(--color-gray-300);
  font-size: 14px;
}

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

.footer-actions {
  display: flex;
  align-items: flex-start;
  justify-content: flex-end;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: 16px 24px;
  text-align: center;
}

.footer-bottom p {
  margin: 0;
  font-size: 13px;
  color: var(--color-gray-400);
}

/* ---------- 3.5 内页标题区 ---------- */
.page-title-area {
  background-color: var(--color-gray-50);
  border-bottom: 1px solid var(--color-gray-100);
  padding: 28px 0;
  margin-bottom: 32px;
}

.page-title-area p {
  font-size: 16px;
  color: var(--color-gray-500);
  max-width: 720px;
  margin: 0 auto;
  text-align: center;
}

.page-intro {
  font-size: 16px;
  color: var(--color-gray-500);
  max-width: 720px;
  margin: 0 auto;
  text-align: center;
}

/* ---------- 3.6 页面标题 ---------- */
.page-header {
  margin-bottom: 32px;
}

.page-title {
  font-size: 32px;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.3;
  margin-bottom: 8px;
}

/* ---------- 3.7 内页两栏布局 ---------- */
.page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 40px;
  align-items: start;
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px 56px;
}

.main-content {
  min-width: 0;
  min-height: 200px;
}

.sidebar {
  min-width: 0;
}

/* layout-shell（focus / metrics 页） */
.layout-shell {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px 56px;
}

/* ---------- 3.8 侧栏卡片 ---------- */
.sidebar-card,
.sidebar-block,
.sidebar-module {
  background-color: var(--color-white);
  border: 1px solid var(--color-gray-100);
  border-radius: var(--radius-lg);
  padding: 20px;
  margin-bottom: 20px;
  box-shadow: var(--shadow-sm);
}

.sidebar-card h2,
.sidebar-block h2,
.sidebar-module h2 {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-primary);
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-gray-50);
  margin-bottom: 12px;
}

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

.sidebar-links li {
  margin-bottom: 2px;
}

.sidebar-links a {
  display: block;
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  color: var(--color-gray-500);
  font-size: 14px;
  line-height: 1.5;
  transition: background-color var(--transition-base), color var(--transition-base);
}

.sidebar-links a:hover {
  background-color: var(--color-gray-50);
  color: var(--color-secondary);
}

/* 侧栏图片 */
.sidebar-figure {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-gray-100);
}

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

.sidebar-figure figcaption {
  padding: 10px 14px;
  font-size: 13px;
  color: var(--color-gray-400);
  background-color: var(--color-white);
  line-height: 1.5;
}

/* 侧栏提示 */
.sidebar-tip {
  font-size: 13px;
  color: var(--color-gray-400);
  line-height: 1.6;
  padding: 10px;
  background-color: var(--color-gray-50);
  border-radius: var(--radius-sm);
  margin-top: 12px;
}

.sidebar-tips {
  font-size: 13px;
  color: var(--color-gray-400);
  line-height: 1.6;
  padding: 10px;
  background-color: var(--color-gray-50);
  border-radius: var(--radius-sm);
  margin-top: 12px;
}

.sidebar-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  margin-top: 12px;
}

.sidebar-link-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  margin-top: 12px;
}

.sidebar-faq {
  font-size: 14px;
  color: var(--color-gray-500);
  line-height: 1.6;
}

/* ---------- 3.9 区块标题 ---------- */
.section-intro {
  font-size: 16px;
  color: var(--color-gray-500);
  max-width: 720px;
  margin-bottom: 28px;
  line-height: 1.7;
}

.section-desc {
  font-size: 16px;
  color: var(--color-gray-500);
  max-width: 720px;
  margin-bottom: 28px;
  line-height: 1.7;
}

/* ---------- 3.10 图片容器 ---------- */
figure {
  margin: 0;
}

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

.content-media-inline {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 24px;
  align-items: start;
  margin: 24px 0;
}

.content-media-inline img {
  width: 100%;
  height: 180px;
  object-fit: cover;
  border-radius: var(--radius-lg);
}

.content-media-inline figcaption {
  font-size: 14px;
  color: var(--color-gray-400);
  line-height: 1.6;
}

/* ---------- 3.11 FAQ 折叠 ---------- */
.faq-item {
  border: 1px solid var(--color-gray-100);
  border-radius: var(--radius-md);
  background-color: var(--color-white);
  margin-bottom: 10px;
  overflow: hidden;
}

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

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

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

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

.faq-item summary:hover {
  background-color: var(--color-gray-50);
}

.faq-item p {
  padding: 0 20px 16px;
  font-size: 15px;
  color: var(--color-gray-500);
  line-height: 1.7;
}

.faq-item a {
  margin: 0 20px 16px;
  display: inline-block;
  font-size: 14px;
  font-weight: 600;
}

.faq-answer {
  padding: 0 20px 16px;
}

.faq-answer p {
  padding: 0;
  margin-bottom: 10px;
}

.faq-answer a {
  margin: 0;
}

/* ---------- 3.12 时间线 ---------- */
.timeline-list {
  list-style: none;
  padding: 0;
  position: relative;
}

.timeline-item {
  position: relative;
  padding-left: 40px;
  padding-bottom: 28px;
  border-left: 2px solid var(--color-gray-100);
  margin-left: 12px;
}

.timeline-item:last-child {
  border-left-color: transparent;
  padding-bottom: 0;
}

.timeline-marker {
  position: absolute;
  left: -10px;
  top: 0;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background-color: var(--color-secondary);
  border: 3px solid var(--color-white);
  box-shadow: 0 0 0 2px var(--color-secondary);
}

.timeline-body {
  min-width: 0;
}

.timeline-body h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 6px;
}

.timeline-body p {
  font-size: 15px;
  color: var(--color-gray-500);
  line-height: 1.7;
  margin-bottom: 8px;
}

.timeline-period {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-secondary);
  background-color: rgba(15, 118, 110, 0.1);
  padding: 2px 10px;
  border-radius: 12px;
  margin-bottom: 8px;
}

.timeline-tag {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-accent);
  background-color: rgba(217, 119, 6, 0.1);
  padding: 2px 10px;
  border-radius: 12px;
  margin-bottom: 8px;
}

.timeline-actions {
  margin-top: 12px;
}

/* ---------- 3.13 内容图片 ---------- */
.metrics-figure {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-gray-100);
}

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

.metrics-figure figcaption {
  padding: 10px 14px;
  font-size: 13px;
  color: var(--color-gray-400);
  background-color: var(--color-white);
}

.metrics-hero-figure {
  margin-bottom: 28px;
}

/* ============================================================
   4. Pages - 页面专属模块
   ============================================================ */

/* ---------- 4.1 首页 ---------- */

/* 4.1.1 Hero 首屏 */
.hero-section {
  background-color: var(--color-primary);
  color: var(--color-white);
  padding: 56px 0;
}

.hero-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

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

.hero-tagline {
  display: inline-block;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent);
  background-color: rgba(217, 119, 6, 0.15);
  padding: 4px 12px;
  border-radius: 20px;
  margin-bottom: 16px;
  letter-spacing: 0.02em;
}

.hero-content h1 {
  font-size: 34px;
  font-weight: 700;
  color: var(--color-white);
  line-height: 1.3;
  margin-bottom: 16px;
}

.hero-description {
  font-size: 16px;
  color: var(--color-gray-100);
  line-height: 1.7;
  margin-bottom: 24px;
}

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

.hero-figure {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

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

/* 4.1.2 节奏区 */
.rhythm-overview {
  padding: 56px 0 40px;
  background-color: var(--color-white);
}

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

.rhythm-overview h2 {
  font-size: 26px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
  text-align: center;
}

.rhythm-overview .section-intro {
  text-align: center;
  margin-left: auto;
  margin-right: auto;
}

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

.rhythm-item {
  background-color: var(--color-gray-50);
  border: 1px solid var(--color-gray-100);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

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

.rhythm-icon {
  width: 44px;
  height: 44px;
  background-color: var(--color-secondary);
  border-radius: var(--radius-md);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.rhythm-icon::before {
  content: "";
  width: 16px;
  height: 16px;
  border: 2px solid var(--color-white);
  border-radius: 3px;
}

.rhythm-item h3 {
  font-size: 17px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.rhythm-item p {
  font-size: 14px;
  color: var(--color-gray-500);
  line-height: 1.6;
  margin-bottom: 0;
}

/* 4.1.3 年度工作节奏表 */
.annual-rhythm {
  padding: 56px 0;
  background-color: var(--color-bg);
}

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

.annual-rhythm h2 {
  font-size: 26px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
  text-align: center;
}

.annual-rhythm .section-intro {
  text-align: center;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: 32px;
}

.rhythm-table-wrap {
  overflow-x: auto;
  background-color: var(--color-white);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-gray-100);
  box-shadow: var(--shadow-sm);
}

.rhythm-table {
  width: 100%;
  min-width: 640px;
  font-size: 14px;
}

.rhythm-table thead th {
  background-color: var(--color-primary);
  color: var(--color-white);
  padding: 14px 16px;
  text-align: left;
  font-weight: 600;
  font-size: 14px;
}

.rhythm-table tbody td {
  padding: 14px 16px;
  border-top: 1px solid var(--color-gray-100);
  vertical-align: top;
  color: var(--color-gray-500);
  line-height: 1.6;
}

.rhythm-table tbody tr:nth-child(even) {
  background-color: var(--color-gray-50);
}

.rhythm-table tbody tr:hover {
  background-color: rgba(15, 118, 110, 0.04);
}

.rhythm-table td:first-child {
  font-weight: 600;
  color: var(--color-primary);
}

/* 4.1.4 服务能力分区 */
.service-capabilities {
  padding: 56px 0;
  background-color: var(--color-white);
}

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

.service-capabilities h2 {
  font-size: 26px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
  text-align: center;
}

.service-capabilities .section-intro {
  text-align: center;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: 32px;
}

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

.service-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-gray-100);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

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

.service-figure {
  margin: 0;
  overflow: hidden;
}

.service-figure img {
  width: 100%;
  height: 180px;
  object-fit: cover;
  display: block;
}

.service-card h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-primary);
  padding: 16px 20px 8px;
}

.service-card p {
  font-size: 14px;
  color: var(--color-gray-500);
  line-height: 1.6;
  padding: 0 20px 20px;
}

/* 4.1.5 服务准则 */
.service-principles {
  padding: 56px 0;
  background-color: var(--color-bg);
}

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

.service-principles h2 {
  font-size: 26px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
  text-align: center;
}

.service-principles .section-intro {
  text-align: center;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: 32px;
}

.principles-list {
  list-style: none;
  padding: 0;
  max-width: 800px;
  margin: 0 auto;
}

.principles-list li {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 16px;
  align-items: start;
  padding: 16px 0;
  border-bottom: 1px solid var(--color-gray-100);
}

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

.principle-num {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background-color: var(--color-secondary);
  color: var(--color-white);
  font-size: 16px;
  font-weight: 700;
  border-radius: var(--radius-md);
}

.principle-text h3 {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 4px;
}

.principle-text p {
  font-size: 14px;
  color: var(--color-gray-500);
  line-height: 1.6;
  margin-bottom: 0;
}

/* 4.1.6 常见问题摘要 */
.faq-summary {
  padding: 56px 0;
  background-color: var(--color-white);
}

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

.faq-summary h2 {
  font-size: 26px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
  text-align: center;
}

.faq-summary .section-intro {
  text-align: center;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: 32px;
}

.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-more {
  text-align: center;
  margin-top: 24px;
}

/* 4.1.7 合作 CTA */
.cta-banner {
  background-color: var(--color-primary);
  padding: 56px 0;
}

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

.cta-banner h2 {
  font-size: 26px;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 12px;
}

.cta-banner p {
  font-size: 16px;
  color: var(--color-gray-100);
  max-width: 640px;
  margin: 0 auto 24px;
  line-height: 1.7;
}

.cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
}

/* 4.1.8 首页相关链接 */
.related-links {
  background-color: var(--color-bg);
  padding: 20px 0;
  border-top: 1px solid var(--color-gray-100);
}

.related-links-label {
  display: inline-block;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-gray-500);
  margin-right: 16px;
}

.related-links-item {
  display: inline-block;
  font-size: 14px;
  color: var(--color-secondary);
  margin-right: 16px;
  padding: 4px 0;
}

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

/* ---------- 4.2 重点工作页 ---------- */
.page-focus .page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 40px;
  align-items: start;
}

/* 重点工作总览 */
.overview-section {
  margin-bottom: 40px;
}

.overview-section h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.overview-list {
  list-style: none;
  padding: 0;
}

.overview-item {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 16px;
  padding: 20px 0;
  border-bottom: 1px solid var(--color-gray-100);
  align-items: start;
}

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

.item-number {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background-color: var(--color-primary);
  color: var(--color-white);
  font-size: 18px;
  font-weight: 700;
  border-radius: var(--radius-md);
}

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

.item-content h3 {
  font-size: 17px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 6px;
}

.item-content p {
  font-size: 14px;
  color: var(--color-gray-500);
  line-height: 1.6;
  margin-bottom: 0;
}

/* 执行流程与交付标准 */
.process-section {
  margin-bottom: 40px;
}

.process-section h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.process-block {
  margin-bottom: 28px;
  padding: 24px;
  background-color: var(--color-white);
  border: 1px solid var(--color-gray-100);
  border-radius: var(--radius-lg);
}

.process-block h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-gray-50);
}

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

.process-grid .process-step {
  background-color: var(--color-gray-50);
  border-radius: var(--radius-md);
  padding: 16px;
}

.process-grid .process-step h4 {
  font-size: 14px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 6px;
}

.process-grid .process-step p {
  font-size: 13px;
  color: var(--color-gray-500);
  line-height: 1.6;
  margin-bottom: 0;
}

.process-step .step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  background-color: var(--color-secondary);
  color: var(--color-white);
  font-size: 13px;
  font-weight: 700;
  border-radius: 50%;
  margin-bottom: 8px;
}

/* 场景展示 */
.scene-section {
  margin-bottom: 40px;
}

.scene-section h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.scene-block {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 24px;
  align-items: center;
  background-color: var(--color-white);
  border: 1px solid var(--color-gray-100);
  border-radius: var(--radius-lg);
  padding: 20px;
}

.scene-figure {
  margin: 0;
  border-radius: var(--radius-md);
  overflow: hidden;
}

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

.scene-text {
  min-width: 0;
}

.scene-text h3 {
  font-size: 17px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.scene-text p {
  font-size: 14px;
  color: var(--color-gray-500);
  line-height: 1.6;
  margin-bottom: 0;
}

/* 相关链接卡片 */
.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.related-card {
  display: block;
  background-color: var(--color-white);
  border: 1px solid var(--color-gray-100);
  border-radius: var(--radius-md);
  padding: 16px;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

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

.related-card h3 {
  font-size: 15px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 6px;
}

.related-card p {
  font-size: 13px;
  color: var(--color-gray-500);
  line-height: 1.5;
  margin-bottom: 0;
}

/* ---------- 4.3 项目记录页 ---------- */
.page-projects .page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 40px;
  align-items: start;
}

.project-category-section {
  margin-bottom: 40px;
}

.project-category-section h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.project-type-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-gray-100);
  border-radius: var(--radius-lg);
  padding: 20px;
  margin-bottom: 16px;
}

.project-type-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 10px;
}

.project-type-header h3 {
  font-size: 17px;
  font-weight: 700;
  color: var(--color-primary);
  margin: 0;
}

.project-type-tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  color: var(--color-secondary);
  background-color: rgba(15, 118, 110, 0.1);
  padding: 2px 8px;
  border-radius: 12px;
}

.project-type-card > p {
  font-size: 14px;
  color: var(--color-gray-500);
  line-height: 1.6;
  margin-bottom: 12px;
}

.project-type-list {
  list-style: none;
  padding: 0;
}

.project-type-list li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  color: var(--color-gray-500);
  line-height: 1.6;
  margin-bottom: 6px;
}

.project-type-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--color-secondary);
}

/* 项目记录模板 */
.project-record-section {
  margin-bottom: 40px;
}

.project-record-section h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.record-item {
  background-color: var(--color-white);
  border: 1px solid var(--color-gray-100);
  border-radius: var(--radius-lg);
  padding: 20px;
  margin-bottom: 16px;
}

.record-item-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.record-item-header h3 {
  font-size: 17px;
  font-weight: 700;
  color: var(--color-primary);
  margin: 0;
}

.record-phase {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  color: var(--color-accent);
  background-color: rgba(217, 119, 6, 0.1);
  padding: 2px 8px;
  border-radius: 12px;
}

.record-detail {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  margin: 0;
}

.record-detail div {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 12px;
  font-size: 14px;
  line-height: 1.6;
}

.record-detail dt {
  font-weight: 600;
  color: var(--color-primary);
  white-space: nowrap;
}

.record-detail dd {
  margin: 0;
  color: var(--color-gray-500);
}

/* 方法说明 */
.method-note-section {
  margin-bottom: 40px;
}

.method-note-section h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.method-list {
  list-style: none;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.method-list li {
  background-color: var(--color-white);
  border: 1px solid var(--color-gray-100);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  font-size: 14px;
  color: var(--color-gray-500);
  line-height: 1.6;
}

/* ---------- 4.4 数据说明页 ---------- */
.page-metrics .layout-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 40px;
  align-items: start;
}

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

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

.metrics-section h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.metric-item {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 16px;
  padding: 20px;
  background-color: var(--color-white);
  border: 1px solid var(--color-gray-100);
  border-radius: var(--radius-lg);
  margin-bottom: 12px;
  align-items: start;
}

.metric-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background-color: var(--color-secondary);
  border-radius: var(--radius-md);
}

.metric-icon::before {
  content: "";
  width: 14px;
  height: 14px;
  border: 2px solid var(--color-white);
  border-radius: 2px;
}

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

.metric-content h3 {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 6px;
}

.metric-content p {
  font-size: 14px;
  color: var(--color-gray-500);
  line-height: 1.6;
  margin-bottom: 8px;
}

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

/* 数据收集流程 */
.process-steps {
  list-style: none;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-top: 20px;
}

.process-steps .process-step {
  background-color: var(--color-white);
  border: 1px solid var(--color-gray-100);
  border-radius: var(--radius-md);
  padding: 16px;
  text-align: center;
}

.process-steps .step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background-color: var(--color-secondary);
  color: var(--color-white);
  font-size: 14px;
  font-weight: 700;
  border-radius: 50%;
  margin-bottom: 8px;
}

.process-steps .process-step h4 {
  font-size: 14px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 4px;
}

.process-steps .process-step p {
  font-size: 13px;
  color: var(--color-gray-500);
  line-height: 1.5;
  margin-bottom: 0;
}

/* 指标快速入口 */
.metric-quick-list {
  list-style: none;
  padding: 0;
}

.metric-quick-list .metric-quick-item {
  margin-bottom: 4px;
}

.metric-quick-list .metric-quick-item a {
  display: block;
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  color: var(--color-gray-500);
  font-size: 14px;
  line-height: 1.5;
}

.metric-quick-list .metric-quick-item a:hover {
  background-color: var(--color-gray-50);
  color: var(--color-secondary);
}

/* 数据说明备注 */
.metrics-note-section {
  background-color: var(--color-gray-50);
  border-left: 4px solid var(--color-secondary);
  border-radius: var(--radius-md);
  padding: 20px;
  margin-bottom: 40px;
}

.metrics-note-section h2 {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.metrics-note-section p {
  font-size: 14px;
  color: var(--color-gray-500);
  line-height: 1.6;
  margin-bottom: 8px;
}

.metrics-note-section p:last-child {
  margin-bottom: 0;
}

/* ---------- 4.5 未来安排页 ---------- */
.page-roadmap .page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 40px;
  align-items: start;
}

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

.roadmap-section h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
}

/* 新服务预告 */
.new-services-section {
  margin-bottom: 40px;
}

.new-services-section h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
}

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

.preview-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-gray-100);
  border-radius: var(--radius-lg);
  padding: 20px;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

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

.preview-card h3 {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.preview-card p {
  font-size: 14px;
  color: var(--color-gray-500);
  line-height: 1.6;
  margin-bottom: 0;
}

/* 发展规划备注 */
.roadmap-note {
  background-color: var(--color-gray-50);
  border-left: 4px solid var(--color-accent);
  border-radius: var(--radius-md);
  padding: 20px;
  margin-bottom: 40px;
}

.roadmap-note h2 {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.roadmap-note p {
  font-size: 14px;
  color: var(--color-gray-500);
  line-height: 1.6;
  margin-bottom: 8px;
}

.roadmap-note p:last-child {
  margin-bottom: 0;
}

/* ---------- 4.6 常见问题页 ---------- */
.page-faq .page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 40px;
  align-items: start;
}

.faq-category-block {
  margin-bottom: 36px;
}

.faq-category-block h2 {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-gray-50);
}

.faq-group {
  margin-bottom: 8px;
}

.faq-note-block {
  background-color: var(--color-gray-50);
  border-left: 4px solid var(--color-secondary);
  border-radius: var(--radius-md);
  padding: 20px;
  margin-top: 32px;
}

.faq-note-block h2 {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.faq-note-block p {
  font-size: 14px;
  color: var(--color-gray-500);
  line-height: 1.6;
}

.faq-note-block a {
  display: inline-block;
  margin-right: 16px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-secondary);
}

.faq-note-block a:hover {
  color: var(--color-primary);
}

/* ---------- 4.7 合作指引页 ---------- */
.page-engage .page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 40px;
  align-items: start;
}

.cooperation-steps {
  margin-bottom: 40px;
}

.cooperation-steps h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
}

/* 合作准则 */
.cooperation-principles {
  margin-bottom: 40px;
}

.cooperation-principles h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.principle-list {
  list-style: none;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.principle-item {
  background-color: var(--color-white);
  border: 1px solid var(--color-gray-100);
  border-radius: var(--radius-md);
  padding: 16px;
}

.principle-item h3 {
  font-size: 15px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 6px;
}

.principle-item p {
  font-size: 14px;
  color: var(--color-gray-500);
  line-height: 1.6;
  margin-bottom: 0;
}

/* 合作准备 */
.cooperation-prepare {
  margin-bottom: 40px;
}

.cooperation-prepare h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
}

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

.prepare-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-gray-100);
  border-radius: var(--radius-md);
  padding: 16px;
}

.prepare-card h3 {
  font-size: 15px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 6px;
}

.prepare-card p {
  font-size: 14px;
  color: var(--color-gray-500);
  line-height: 1.6;
  margin-bottom: 0;
}

/* 合作启动 */
.cooperation-start {
  text-align: center;
  background-color: var(--color-gray-50);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  margin-bottom: 40px;
}

.cooperation-start h2 {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.cooperation-start p {
  font-size: 15px;
  color: var(--color-gray-500);
  max-width: 560px;
  margin: 0 auto 20px;
  line-height: 1.7;
}

.start-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
}

/* 步骤说明 */
.step-note {
  font-size: 13px;
  color: var(--color-gray-400);
  margin-top: 6px;
  line-height: 1.5;
}

/* ---------- 4.8 404 页面 ---------- */
.site-error .error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 80px 24px;
}

.error-section {
  text-align: center;
  max-width: 600px;
  width: 100%;
}

.error-code {
  font-size: 96px;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: 16px;
}

.error-title {
  font-size: 28px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.error-desc {
  font-size: 16px;
  color: var(--color-gray-500);
  line-height: 1.7;
  margin-bottom: 24px;
}

.error-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  margin-bottom: 24px;
}

.error-help {
  font-size: 14px;
  color: var(--color-gray-400);
}

.error-help a {
  display: inline-block;
  margin: 0 8px;
  font-weight: 600;
}

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

/* 平板及以下：1024px */
@media (max-width: 1024px) {
  .page-layout,
  .page-focus .page-layout,
  .page-projects .page-layout,
  .page-faq .page-layout,
  .page-engage .page-layout,
  .page-roadmap .page-layout,
  .page-metrics .layout-shell {
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: 24px;
  }

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

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

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

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

  .hero-container {
    gap: 32px;
  }

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

/* 手机端：768px */
@media (max-width: 768px) {
  /* 页头 */
  .header-container {
    flex-wrap: wrap;
    min-height: 60px;
  }

  .nav-toggle {
    display: block;
    order: 3;
  }

  .site-nav {
    order: 4;
    width: 100%;
    flex-basis: 100%;
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px 0;
    width: 100%;
  }

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

  .nav-list li {
    width: 100%;
  }

  .nav-link {
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    font-size: 15px;
  }

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

  .hero-container {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .hero-content {
    text-align: left;
  }

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

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

  .rhythm-overview,
  .annual-rhythm,
  .service-capabilities,
  .service-principles,
  .faq-summary,
  .cta-banner {
    padding: 40px 0;
  }

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

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

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

  .principles-list li {
    grid-template-columns: 40px 1fr;
    gap: 12px;
  }

  .principle-num {
    width: 36px;
    height: 36px;
    font-size: 14px;
  }

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

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

  /* 内页 */
  .page-title-area {
    padding: 20px 0;
    margin-bottom: 24px;
  }

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

  .page-layout,
  .page-focus .page-layout,
  .page-projects .page-layout,
  .page-faq .page-layout,
  .page-engage .page-layout,
  .page-roadmap .page-layout,
  .page-metrics .layout-shell {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 0 16px 40px;
  }

  .layout-shell {
    padding: 0 16px 40px;
  }

  .sidebar {
    order: 2;
  }

  .main-content {
    order: 1;
  }

  .container,
  .header-container,
  .footer-container,
  .page-container {
    padding-left: 16px;
    padding-right: 16px;
  }

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

  .footer-actions {
    justify-content: flex-start;
  }

  .footer-nav .footer-links {
    gap: 8px 16px;
  }

  /* 内页组件 */
  .process-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

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

  .scene-figure img {
    height: 160px;
  }

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

  .content-media-inline {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .content-media-inline img {
    height: 160px;
  }

  .method-list {
    grid-template-columns: 1fr;
    gap: 10px;
  }

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

  .process-steps {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .principle-list {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .prepare-grid {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .timeline-item {
    padding-left: 32px;
    margin-left: 8px;
  }

  .timeline-marker {
    left: -9px;
    width: 16px;
    height: 16px;
  }

  .record-detail div {
    grid-template-columns: 1fr;
    gap: 2px;
  }

  .record-detail dt {
    white-space: normal;
  }

  .metric-item {
    grid-template-columns: 40px 1fr;
    gap: 12px;
    padding: 16px;
  }

  .metric-icon {
    width: 36px;
    height: 36px;
  }

  .overview-item {
    grid-template-columns: 44px 1fr;
    gap: 12px;
    padding: 16px 0;
  }

  .item-number {
    width: 38px;
    height: 38px;
    font-size: 16px;
  }

  .error-code {
    font-size: 64px;
  }

  .error-title {
    font-size: 22px;
  }

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

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

  .cooperation-start {
    padding: 24px 16px;
  }

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

  .faq-item p,
  .faq-answer {
    padding-left: 16px;
    padding-right: 16px;
  }

  .rhythm-table-wrap {
    overflow-x: auto;
  }

  .rhythm-table {
    min-width: 560px;
  }

  .hero-tagline {
    font-size: 13px;
  }

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

  .section-intro,
  .section-desc {
    font-size: 15px;
  }

  .breadcrumb-nav .breadcrumb-list {
    padding: 0 16px;
  }
}

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

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

  .rhythm-item {
    padding: 18px;
  }

  .service-card h3 {
    padding: 14px 16px 6px;
  }

  .service-card p {
    padding: 0 16px 16px;
    font-size: 13px;
  }

  .principles-list li {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .principle-num {
    width: 32px;
    height: 32px;
  }

  .timeline-item {
    padding-left: 28px;
  }

  .timeline-marker {
    left: -8px;
    width: 14px;
    height: 14px;
  }

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

  .page-title-area p,
  .page-intro {
    font-size: 14px;
  }

  .sidebar-card,
  .sidebar-block,
  .sidebar-module {
    padding: 16px;
  }

  .process-block {
    padding: 16px;
  }

  .project-type-card,
  .record-item {
    padding: 16px;
  }

  .preview-card,
  .principle-item,
  .prepare-card {
    padding: 14px;
  }

  .metric-item {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .metric-icon {
    width: 32px;
    height: 32px;
  }

  .overview-item {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .item-number {
    width: 32px;
    height: 32px;
    font-size: 14px;
  }

  .error-code {
    font-size: 52px;
  }
}

/* ---------- 滚动渐显动画（增强，不影响初始可见性） ---------- */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (prefers-reduced-motion: no-preference) {
  .rhythm-item,
  .service-card,
  .process-block,
  .project-type-card,
  .record-item,
  .preview-card,
  .principle-item,
  .prepare-card,
  .metric-item,
  .timeline-item {
    animation: fadeInUp 0.4s ease both;
  }

  .rhythm-item:nth-child(2),
  .service-card:nth-child(2),
  .process-block:nth-child(2),
  .project-type-card:nth-child(2),
  .record-item:nth-child(2),
  .preview-card:nth-child(2),
  .principle-item:nth-child(2),
  .prepare-card:nth-child(2),
  .metric-item:nth-child(2),
  .timeline-item:nth-child(2) {
    animation-delay: 0.06s;
  }

  .rhythm-item:nth-child(3),
  .service-card:nth-child(3),
  .process-block:nth-child(3),
  .project-type-card:nth-child(3),
  .record-item:nth-child(3),
  .preview-card:nth-child(3),
  .principle-item:nth-child(3),
  .prepare-card:nth-child(3),
  .metric-item:nth-child(3),
  .timeline-item:nth-child(3) {
    animation-delay: 0.12s;
  }

  .rhythm-item:nth-child(4),
  .service-card:nth-child(4),
  .process-block:nth-child(4),
  .project-type-card:nth-child(4),
  .record-item:nth-child(4),
  .preview-card:nth-child(4),
  .principle-item:nth-child(4),
  .prepare-card:nth-child(4),
  .metric-item:nth-child(4),
  .timeline-item:nth-child(4) {
    animation-delay: 0.18s;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}