/* ============================================================
   BASE — 全站基础变量、重置、字体、颜色、通用元素
   ============================================================ */
:root {
  --color-primary: #1f3a5f;
  --color-primary-light: #2c4f7a;
  --color-primary-dark: #162a47;
  --color-bg: #f4f7fb;
  --color-bg-white: #ffffff;
  --color-bg-soft: #eef2f8;
  --color-text: #2d2d2d;
  --color-text-light: #5a6b7e;
  --color-text-muted: #7d8b9c;
  --color-accent: #c0392b;
  --color-accent-light: #e74c3c;
  --color-announce-bg: #facc15;
  --color-announce-text: #4a3f00;
  --color-border: #dce3ec;
  --color-border-light: #e8edf3;
  --color-code-bg: #f0f3f8;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", "JetBrains Mono", Consolas, "Courier New", monospace;
  --container-width: 1200px;
  --container-inner: 980px;
  --header-height: 64px;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
  --shadow-sm: 0 1px 3px rgba(31, 58, 95, 0.08);
  --shadow-md: 0 2px 8px rgba(31, 58, 95, 0.1);
  --shadow-lg: 0 4px 16px rgba(31, 58, 95, 0.12);
}

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

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

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

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

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

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  color: var(--color-primary-dark);
  line-height: 1.35;
  font-weight: 600;
}

h1 {
  font-size: 30px;
}

h2 {
  font-size: 22px;
}

h3 {
  font-size: 18px;
}

p {
  margin-bottom: 0.75em;
}

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

strong {
  font-weight: 600;
}

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

th,
td {
  text-align: left;
  padding: 10px 14px;
  border-bottom: 1px solid var(--color-border-light);
}

th {
  font-weight: 600;
  color: var(--color-primary-dark);
  background-color: var(--color-bg-soft);
}

blockquote {
  border-left: 4px solid var(--color-primary);
  background-color: var(--color-bg-soft);
  padding: 12px 18px;
  margin: 16px 0;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

/* 等宽术语样式 */
code,
kbd,
samp,
.term-inline {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background-color: var(--color-code-bg);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-sm);
  padding: 1px 5px;
  color: var(--color-primary-dark);
}

/* 视觉隐藏，仅用于 a11y */
.visually-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

/* ============================================================
   LAYOUT — 全站骨架：页头、导航、页脚、主容器、面包屑、标题区
   ============================================================ */

/* ---------- 页头 ---------- */
.site-header {
  background-color: var(--color-primary);
  box-shadow: 0 2px 8px rgba(22, 42, 71, 0.25);
  position: relative;
  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: inline-flex;
  align-items: center;
  flex-shrink: 0;
  color: #ffffff;
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0;
}

.brand-logo:hover {
  color: #ffffff;
  opacity: 0.9;
}

.brand-name {
  font-size: 20px;
  font-weight: 700;
  color: #ffffff;
  white-space: nowrap;
}

/* ---------- 主导航 ---------- */
.main-nav ul {
  display: flex;
  align-items: center;
  gap: 4px;
}

.main-nav li {
  position: relative;
}

.main-nav a {
  display: block;
  padding: 8px 14px;
  color: rgba(255, 255, 255, 0.85);
  font-size: 15px;
  font-weight: 500;
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.main-nav a:hover {
  color: #ffffff;
  background-color: rgba(255, 255, 255, 0.12);
}

.main-nav a.is-current {
  color: #ffffff;
  background-color: rgba(255, 255, 255, 0.16);
  font-weight: 600;
}

/* 移动端导航按钮 — 桌面隐藏 */
.nav-toggle {
  display: none;
}

/* ---------- 页脚 ---------- */
.site-footer {
  background-color: var(--color-primary-dark);
  color: rgba(255, 255, 255, 0.8);
  margin-top: auto;
  padding-top: 36px;
}

.footer-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px 28px;
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr;
  gap: 40px;
}

.footer-brand p {
  color: rgba(255, 255, 255, 0.7);
  font-size: 14px;
  line-height: 1.8;
  margin-bottom: 0;
}

.footer-brand strong {
  display: block;
  color: #ffffff;
  font-size: 18px;
  margin-bottom: 8px;
}

.footer-links h3 {
  color: #ffffff;
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 12px;
}

.footer-links ul {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.7);
  font-size: 14px;
}

.footer-links a:hover {
  color: #ffffff;
}

.footer-version p {
  color: rgba(255, 255, 255, 0.55);
  font-size: 13px;
  line-height: 1.8;
  margin-bottom: 0;
}

.footer-copyright {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding: 16px 24px;
  text-align: center;
}

.footer-copyright p {
  color: rgba(255, 255, 255, 0.5);
  font-size: 13px;
  margin-bottom: 0;
}

/* ---------- 主容器 ---------- */
.site-main {
  flex: 1;
  width: 100%;
}

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

/* 布局壳 */
.layout-shell {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* 首页三栏布局：左侧索引 + 中心内容 + 右侧动态 */
.home-main .layout-shell.sidebar-left {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr) 260px;
  gap: 28px;
  align-items: start;
  padding: 28px 24px 48px;
}

/* 内页通用：主内容 + 右侧栏 */
.page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 32px;
  align-items: start;
  padding-bottom: 48px;
}

.page-layout.sidebar-right {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 32px;
  align-items: start;
  padding-bottom: 48px;
}

/* 关于页等：主内容 + 右侧栏 */
.page-layout.layout-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 32px;
  align-items: start;
  padding-bottom: 48px;
}

/* 标准页：主内容 + 右侧栏 */
.standard-page .layout-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 32px;
  align-items: start;
  padding-bottom: 48px;
}

/* FAQ 页：主内容 + 右侧栏 */
.layout-shell.content-right {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 32px;
  align-items: start;
  padding-bottom: 48px;
}

/* 内容区统一样式 */
.content-area {
  min-width: 0;
  min-height: 400px;
}

/* 侧栏统一样式 */
.sidebar-right,
.sidebar-area,
.right-sidebar {
  min-width: 0;
}

/* ---------- 面包屑 ---------- */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  padding: 18px 0 4px;
  font-size: 14px;
  color: var(--color-text-muted);
}

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

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

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

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

/* ---------- 页面标题区 ---------- */
.page-header {
  padding: 12px 0 20px;
}

.page-title {
  font-size: 30px;
  font-weight: 700;
  color: var(--color-primary-dark);
  margin-bottom: 6px;
}

.page-description {
  font-size: 16px;
  color: var(--color-text-light);
  max-width: 720px;
  line-height: 1.7;
}

.page-lead {
  font-size: 16px;
  color: var(--color-text-light);
  line-height: 1.8;
  margin-bottom: 0;
}

.page-title-block {
  padding: 8px 0 20px;
  border-bottom: 1px solid var(--color-border-light);
  margin-bottom: 24px;
}

.page-heading {
  padding: 8px 0 20px;
  border-bottom: 1px solid var(--color-border-light);
  margin-bottom: 24px;
}

/* ============================================================
   COMPONENTS — 通用组件：按钮、卡片、步骤、FAQ、表格、侧栏模块
   ============================================================ */

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 24px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast);
  min-height: 44px;
}

.btn-primary {
  background-color: var(--color-primary);
  color: #ffffff;
  border-color: var(--color-primary);
}

.btn-primary:hover {
  background-color: var(--color-primary-light);
  border-color: var(--color-primary-light);
  color: #ffffff;
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

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

.btn-back {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 28px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-md);
  background-color: var(--color-primary);
  color: #ffffff;
  border: 1px solid var(--color-primary);
  min-height: 44px;
  transition: background-color var(--transition-fast);
}

.btn-back:hover {
  background-color: var(--color-primary-light);
  color: #ffffff;
}

/* ---------- 文本链接 ---------- */
.text-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-primary);
}

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

.text-link::after {
  content: "→";
  font-size: 14px;
  transition: transform var(--transition-fast);
}

.text-link:hover::after {
  transform: translateX(3px);
}

/* ---------- 公告条 ---------- */
.announce-bar {
  background-color: var(--color-announce-bg);
  color: var(--color-announce-text);
  padding: 8px 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  position: relative;
  font-size: 14px;
}

.announce-bar p {
  margin-bottom: 0;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: center;
}

.announce-bar a {
  color: var(--color-announce-text);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
}

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

.announce-icon {
  font-size: 16px;
  line-height: 1;
}

.announce-close {
  background: transparent;
  border: none;
  font-size: 18px;
  line-height: 1;
  cursor: pointer;
  color: var(--color-announce-text);
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  min-width: 44px;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.announce-close:hover {
  background-color: rgba(74, 63, 0, 0.12);
}

/* ---------- 服务卡片 ---------- */
.service-card {
  background-color: var(--color-bg-white);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: 22px 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

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

.service-card h3 {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-primary-dark);
  margin-bottom: 0;
}

.service-card p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.75;
  margin-bottom: 0;
}

.service-card a {
  margin-top: auto;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-primary);
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding-top: 8px;
}

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

.service-card a::after {
  content: "→";
  font-size: 13px;
}

/* 首页服务矩阵 */
.service-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

/* 服务页服务矩阵 */
.service-card-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.service-scene {
  margin-top: 4px;
}

.service-scene strong {
  display: inline-block;
  font-size: 13px;
  color: var(--color-accent);
  font-weight: 600;
  margin-bottom: 2px;
}

/* ---------- 步骤条 ---------- */
.process-steps {
  margin-top: 8px;
}

/* 首页四步横排 */
.home-main .process-steps {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
  margin-top: 16px;
}

.step-item {
  background-color: var(--color-bg-white);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: 18px 16px;
  position: relative;
}

.step-item .step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background-color: var(--color-primary);
  color: #ffffff;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 10px;
}

.step-item h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-primary-dark);
  margin-bottom: 6px;
}

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

/* ---------- FAQ ---------- */
.faq-accordion,
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.faq-item {
  background-color: var(--color-bg-white);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

.faq-item:hover {
  border-color: var(--color-primary);
}

.faq-item summary {
  padding: 14px 18px;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-primary-dark);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: 48px;
  user-select: none;
}

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

.faq-item summary::after {
  content: "+";
  font-size: 20px;
  font-weight: 400;
  color: var(--color-primary);
  flex-shrink: 0;
  line-height: 1;
  transition: transform var(--transition-base);
}

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

.faq-answer {
  padding: 0 18px 16px;
}

.faq-answer p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.8;
  margin-bottom: 0;
}

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

/* FAQ 预览区（首页） */
.faq-preview {
  margin-top: 12px;
}

.faq-preview .faq-accordion {
  margin-bottom: 20px;
}

/* ---------- 表格 ---------- */
.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  background-color: var(--color-bg-white);
}

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

.table-wrap th {
  background-color: var(--color-bg-soft);
  font-size: 14px;
}

.table-wrap td {
  font-size: 14px;
  color: var(--color-text);
  line-height: 1.7;
}

/* 质量承诺标准简表 */
.standard-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  background-color: var(--color-bg-white);
}

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

.standard-table th {
  background-color: var(--color-bg-soft);
  font-size: 14px;
}

.standard-table td {
  font-size: 14px;
  color: var(--color-text);
  line-height: 1.7;
}

/* ---------- 侧栏通用模块 ---------- */
.sidebar-block,
.side-module,
.sidebar-module {
  background-color: var(--color-bg-white);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: 18px 18px;
  margin-bottom: 16px;
}

.sidebar-block h2,
.sidebar-block h3,
.side-module h2,
.sidebar-module h2 {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-primary-dark);
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border-light);
  margin-bottom: 12px;
}

.sidebar-links,
.side-links {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.sidebar-links li,
.side-links li {
  border-bottom: 1px solid var(--color-border-light);
}

.sidebar-links li:last-child,
.side-links li:last-child {
  border-bottom: none;
}

.sidebar-links a,
.side-links a {
  display: block;
  padding: 8px 4px;
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.5;
}

.sidebar-links a:hover,
.side-links a:hover {
  color: var(--color-primary);
}

/* ---------- 图片与 figure ---------- */
figure {
  margin: 0;
}

figure img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
}

figcaption {
  font-size: 13px;
  color: var(--color-text-muted);
  padding: 8px 2px 0;
  line-height: 1.6;
  text-align: center;
}

/* 首页主视觉 */
.hero-media figure img {
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

/* 首页内容配图 */
.content-media {
  margin-top: 28px;
}

.content-media img {
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

/* 内页内容配图 */
.content-figure,
.scene-figure,
.content-image {
  margin: 24px 0;
}

.content-figure img,
.scene-figure img,
.content-image img {
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

/* ============================================================
   PAGES — 各页面特有布局与模块
   ============================================================ */

/* ---------- 首页 ---------- */
.site-home {
  background-color: var(--color-bg);
}

/* 左侧索引栏 */
.left-index {
  background-color: var(--color-bg-white);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: 18px 16px;
  position: sticky;
  top: calc(var(--header-height) + 20px);
}

.left-index h2 {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary-dark);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border-light);
  margin-bottom: 10px;
}

.index-nav,
.index-process {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin-bottom: 18px;
}

.index-nav li,
.index-process li {
  border-bottom: 1px solid var(--color-border-light);
}

.index-nav li:last-child,
.index-process li:last-child {
  border-bottom: none;
}

.index-nav a,
.index-process a {
  display: block;
  padding: 7px 4px;
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.5;
}

.index-nav a:hover,
.index-process a:hover {
  color: var(--color-primary);
}

/* 中心内容区 */
.center-content {
  min-width: 0;
}

/* hero 首屏 */
.hero-section {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 32px;
  align-items: center;
  background-color: var(--color-bg-white);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  margin-bottom: 28px;
}

.hero-copy h1 {
  font-size: 30px;
  font-weight: 700;
  color: var(--color-primary-dark);
  margin-bottom: 10px;
  line-height: 1.3;
}

.hero-slogan {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 12px;
  line-height: 1.5;
}

.hero-desc {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.8;
  margin-bottom: 20px;
}

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

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

.hero-media img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

/* 服务矩阵区块 */
.service-matrix {
  margin-bottom: 28px;
}

.service-matrix h2,
.process-overview h2,
.faq-preview h2 {
  font-size: 20px;
  font-weight: 600;
  color: var(--color-primary-dark);
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border-light);
}

/* 流程概览区块 */
.process-overview {
  margin-bottom: 28px;
}

.process-overview > .text-link {
  margin-top: 14px;
}

/* FAQ 预览与标准摘要 */
.faq-preview {
  margin-bottom: 28px;
}

.standard-summary {
  background-color: var(--color-bg-soft);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: 18px 20px;
  margin-top: 20px;
}

.standard-summary h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-primary-dark);
  margin-bottom: 10px;
}

.standard-summary ul {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 12px;
}

.standard-summary li {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
  padding-left: 16px;
  position: relative;
}

.standard-summary li::before {
  content: "·";
  position: absolute;
  left: 4px;
  color: var(--color-primary);
  font-weight: 700;
  font-size: 16px;
}

/* 右侧动态栏 */
.right-dynamic {
  background-color: var(--color-bg-white);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: 18px 16px;
  position: sticky;
  top: calc(var(--header-height) + 20px);
}

.right-dynamic h2 {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary-dark);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border-light);
  margin-bottom: 10px;
}

.notice-list,
.update-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin-bottom: 18px;
}

.notice-list li,
.update-list li {
  border-bottom: 1px solid var(--color-border-light);
}

.notice-list li:last-child,
.update-list li:last-child {
  border-bottom: none;
}

.notice-list a,
.update-list a {
  display: block;
  padding: 7px 4px;
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.5;
}

.notice-list a:hover,
.update-list a:hover {
  color: var(--color-primary);
}

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

/* ---------- 关于页 ---------- */
.about-intro h2,
.about-principles h2,
.about-standard h2 {
  font-size: 20px;
  font-weight: 600;
  color: var(--color-primary-dark);
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border-light);
}

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

.about-intro-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 24px;
  align-items: start;
}

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

.about-figure img {
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.about-principles {
  margin-bottom: 32px;
}

.section-desc {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 16px;
}

.principle-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.principle-item {
  background-color: var(--color-bg-white);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: 18px 16px;
}

.principle-item h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-primary-dark);
  margin-bottom: 8px;
}

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

.about-standard {
  margin-bottom: 24px;
}

.standard-quote p {
  font-size: 15px;
  color: var(--color-text);
  line-height: 1.8;
  margin-bottom: 0;
}

.about-standard > p:last-child {
  margin-top: 12px;
  font-size: 14px;
}

/* ---------- 服务项目页 ---------- */
.service-matrix-section {
  margin-bottom: 32px;
}

.service-matrix-section h2,
.scene-section h2,
.notice-section h2 {
  font-size: 20px;
  font-weight: 600;
  color: var(--color-primary-dark);
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border-light);
}

.scene-section {
  margin-bottom: 32px;
}

.scene-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-bottom: 20px;
}

.scene-item {
  background-color: var(--color-bg-white);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: 18px 16px;
}

.scene-item h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-primary-dark);
  margin-bottom: 8px;
}

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

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

.notice-content {
  background-color: var(--color-bg-soft);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: 18px 20px;
}

.notice-content p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.8;
  margin-bottom: 10px;
}

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

.notice-content a {
  font-weight: 500;
}

/* ---------- 服务流程页 ---------- */
.process-steps {
  margin-bottom: 32px;
}

.process-steps h2,
.deliverables-table h2,
.next-step-guide h2 {
  font-size: 20px;
  font-weight: 600;
  color: var(--color-primary-dark);
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border-light);
}

.step-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 16px;
}

.step-list .step-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  padding: 18px 20px;
}

.step-list .step-num,
.step-list .step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background-color: var(--color-primary);
  color: #ffffff;
  font-size: 15px;
  font-weight: 600;
  flex-shrink: 0;
}

.step-list .step-head {
  min-width: 0;
}

.step-list .step-head h3 {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-primary-dark);
  margin-bottom: 4px;
}

.step-list .step-head p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.75;
  margin-bottom: 0;
}

.deliverables-table {
  margin-bottom: 32px;
}

.deliverables-table .table-wrap {
  margin-top: 16px;
}

.next-step-guide {
  margin-bottom: 24px;
}

.guide-links {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 12px;
}

.guide-links a {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 8px 16px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
  border-radius: var(--radius-md);
  min-height: 44px;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.guide-links a:hover {
  background-color: var(--color-primary);
  color: #ffffff;
}

.guide-links a::after {
  content: "→";
  font-size: 13px;
}

/* ---------- 质量承诺页 ---------- */
.quality-promise {
  margin-bottom: 32px;
}

.quality-promise h2,
.delivery-section h2,
.standard-summary h2 {
  font-size: 20px;
  font-weight: 600;
  color: var(--color-primary-dark);
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border-light);
}

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

.promise-item {
  background-color: var(--color-bg-white);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.promise-item summary {
  padding: 14px 18px;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-primary-dark);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: 48px;
  user-select: none;
}

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

.promise-item summary::after {
  content: "+";
  font-size: 20px;
  font-weight: 400;
  color: var(--color-primary);
  flex-shrink: 0;
  line-height: 1;
  transition: transform var(--transition-base);
}

.promise-item[open] summary::after {
  content: "−";
}

.promise-content {
  padding: 0 18px 16px;
}

.promise-content p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.8;
  margin-bottom: 0;
}

.delivery-section {
  margin-bottom: 32px;
}

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

.standard-summary {
  margin-bottom: 24px;
}

.standard-link {
  margin-top: 12px;
}

.standard-link a {
  font-weight: 500;
}

/* 版本信息 */
.version-note {
  font-size: 13px;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: 4px;
}

.update-date {
  font-size: 13px;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: 8px;
}

.update-list {
  margin-bottom: 0;
}

/* ---------- 合作指南页 ---------- */
.content-block {
  margin-bottom: 32px;
}

.content-block h2 {
  font-size: 20px;
  font-weight: 600;
  color: var(--color-primary-dark);
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border-light);
}

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

.content-block .content-figure {
  margin-top: 16px;
}

/* 合作材料清单 */
.material-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin: 12px 0;
}

.material-list li {
  font-size: 14px;
  color: var(--color-text);
  line-height: 1.7;
  padding-left: 20px;
  position: relative;
}

.material-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--color-primary);
  font-weight: 600;
}

/* ---------- FAQ 页 ---------- */
.main-content {
  min-width: 0;
}

.faq-section {
  margin-bottom: 32px;
}

.section-heading {
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border-light);
}

.section-heading h2 {
  font-size: 20px;
  font-weight: 600;
  color: var(--color-primary-dark);
  margin-bottom: 4px;
}

.section-heading p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 0;
}

.faq-section-delivery .content-image {
  margin: 16px 0 20px;
}

.more-guidance {
  background-color: var(--color-bg-soft);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  margin-bottom: 24px;
}

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

.more-guidance a {
  font-weight: 500;
  margin-right: 12px;
}

/* ---------- 内容标准页 ---------- */
.principles-section {
  margin-bottom: 32px;
}

.principles-section h2,
.report-standard-section h2,
.standard-summary h2 {
  font-size: 20px;
  font-weight: 600;
  color: var(--color-primary-dark);
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border-light);
}

.principles-section > p {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 16px;
}

.principle-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-bottom: 20px;
}

.principle-card {
  background-color: var(--color-bg-white);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: 18px 16px;
}

.principle-card h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-primary-dark);
  margin-bottom: 8px;
}

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

.report-standard-section {
  margin-bottom: 32px;
}

.report-standard-section > p {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 16px;
}

.report-standard-section .table-wrap {
  margin-bottom: 16px;
}

.report-standard-section > p:last-child {
  font-size: 14px;
  color: var(--color-text-muted);
}

/* ---------- 404 页 ---------- */
.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - 64px - 220px);
  padding: 48px 24px;
}

.error-section {
  text-align: center;
  max-width: 480px;
  background-color: var(--color-bg-white);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  box-shadow: var(--shadow-sm);
}

.error-section h1 {
  font-size: 28px;
  font-weight: 700;
  color: var(--color-primary-dark);
  margin-bottom: 12px;
}

.error-code {
  font-size: 56px;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: 16px;
  font-family: var(--font-mono);
}

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

.error-section .btn-back {
  margin-top: 16px;
}

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

/* ---------- 平板：≤1024px ---------- */
@media (max-width: 1024px) {
  .home-main .layout-shell.sidebar-left {
    grid-template-columns: 200px minmax(0, 1fr);
  }

  .right-dynamic {
    grid-column: 1 / -1;
    position: static;
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }

  .right-dynamic h2 {
    grid-column: 1 / -1;
  }

  .right-dynamic .notice-list,
  .right-dynamic .update-list {
    margin-bottom: 0;
  }

  .right-dynamic .rule-text {
    grid-column: 1 / -1;
  }

  .layout-shell.content-right,
  .page-layout,
  .page-layout.sidebar-right,
  .page-layout.layout-shell,
  .standard-page .layout-shell {
    grid-template-columns: minmax(0, 1fr) 240px;
    gap: 24px;
  }
}

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

  .main-nav {
    position: static;
  }

  .main-nav ul {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background-color: var(--color-primary);
    flex-direction: column;
    gap: 0;
    padding: 8px 16px 16px;
    box-shadow: 0 8px 16px rgba(22, 42, 71, 0.25);
    z-index: 99;
  }

  .main-nav ul.is-open {
    display: flex;
  }

  .main-nav a {
    padding: 12px 8px;
    font-size: 15px;
    border-radius: var(--radius-sm);
  }

  .nav-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: var(--radius-sm);
    cursor: pointer;
    position: relative;
    z-index: 101;
  }

  .nav-toggle span {
    display: block;
    width: 20px;
    height: 2px;
    background-color: #ffffff;
    position: relative;
    transition: background-color var(--transition-fast);
  }

  .nav-toggle span::before,
  .nav-toggle span::after {
    content: "";
    position: absolute;
    left: 0;
    width: 20px;
    height: 2px;
    background-color: #ffffff;
    transition: transform var(--transition-fast);
  }

  .nav-toggle span::before {
    top: -6px;
  }

  .nav-toggle span::after {
    top: 6px;
  }

  /* 首页三栏 → 单列，中心内容在最前 */
  .home-main .layout-shell.sidebar-left {
    display: flex;
    flex-direction: column;
    gap: 24px;
    padding: 20px 16px 40px;
  }

  .home-main .layout-shell.sidebar-left .center-content {
    order: 1;
  }

  .home-main .layout-shell.sidebar-left .left-index {
    order: 2;
    position: static;
  }

  .home-main .layout-shell.sidebar-left .right-dynamic {
    order: 3;
    display: block;
  }

  .right-dynamic {
    grid-column: auto;
    display: block;
  }

  .right-dynamic .notice-list,
  .right-dynamic .update-list {
    margin-bottom: 18px;
  }

  /* 内页：主内容 + 右侧栏 → 单列 */
  .layout-shell.content-right,
  .page-layout,
  .page-layout.sidebar-right,
  .page-layout.layout-shell,
  .standard-page .layout-shell {
    display: flex;
    flex-direction: column;
    gap: 24px;
    padding: 0 16px 40px;
  }

  .site-main.inner-main {
    padding: 0 16px;
  }

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

  /* 侧栏在手机端显示在正文之后 */
  .sidebar-right,
  .sidebar-area,
  .right-sidebar {
    order: 2;
  }

  .content-area,
  .main-content {
    order: 1;
  }

  /* 侧栏模块手机端两列 */
  .sidebar-right .sidebar-block,
  .sidebar-right .side-module,
  .sidebar-area .sidebar-module,
  .right-sidebar .sidebar-block {
    margin-bottom: 12px;
  }

  /* hero 单列 */
  .hero-section {
    grid-template-columns: 1fr;
    gap: 20px;
    padding: 24px 20px;
  }

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

  .hero-slogan {
    font-size: 16px;
  }

  .hero-actions {
    flex-direction: column;
    gap: 10px;
  }

  .hero-actions .btn {
    width: 100%;
  }

  /* 首页服务矩阵 2 列 */
  .service-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
  }

  /* 服务页服务矩阵 1 列 */
  .service-card-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  /* 首页流程四步 1 列 */
  .home-main .process-steps {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  /* 场景列表 1 列 */
  .scene-list {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  /* 关于页原则列表 1 列 */
  .principle-list {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  /* 关于页 intro 单列 */
  .about-intro-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  /* 标准页原则卡片 1 列 */
  .principle-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  /* 表格横向滚动 */
  .table-wrap {
    overflow-x: auto;
  }

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

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

  .standard-table {
    min-width: 440px;
  }

  /* 页脚单列 */
  .footer-inner {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 0 16px 24px;
  }

  .footer-copyright {
    padding: 14px 16px;
  }

  /* 面包屑 */
  .breadcrumb {
    padding-top: 14px;
  }

  /* 页面标题 */
  .page-title {
    font-size: 26px;
  }

  /* 公告条 */
  .announce-bar {
    padding: 8px 48px 8px 16px;
    justify-content: flex-start;
  }

  .announce-bar p {
    justify-content: flex-start;
    font-size: 13px;
  }

  /* 步骤列表 */
  .step-list .step-item {
    padding: 14px 16px;
    gap: 12px;
  }

  /* 引导链接 */
  .guide-links {
    flex-direction: column;
    gap: 8px;
  }

  .guide-links a {
    width: 100%;
    justify-content: center;
  }

  /* 404 */
  .error-section {
    padding: 32px 24px;
  }

  .error-code {
    font-size: 44px;
  }
}

/* ---------- 小屏手机：≤390px ---------- */
@media (max-width: 390px) {
  .brand-name {
    font-size: 17px;
  }

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

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

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

  .hero-section {
    padding: 20px 16px;
  }

  .footer-links ul {
    flex-direction: column;
    gap: 4px;
  }

  .announce-icon {
    display: none;
  }
}

/* ---------- 打印样式 ---------- */
@media print {
  .site-header,
  .site-footer,
  .announce-bar,
  .sidebar-right,
  .sidebar-area,
  .right-sidebar,
  .left-index,
  .right-dynamic,
  .breadcrumb {
    display: none !important;
  }

  body {
    background-color: #ffffff;
    color: #000000;
  }

  .site-main {
    padding: 0 !important;
  }

  .layout-shell,
  .page-layout {
    display: block !important;
    padding: 0 !important;
  }

  .content-area,
  .main-content {
    width: 100% !important;
  }

  a {
    color: #000000;
    text-decoration: underline;
  }
}