/* =========================================================
   91i吃瓜 · 全站样式表
   自然科普风 · 白底 + 松绿主色 + 沙色辅助
   ========================================================= */

/* =========================================================
   Base — 重置、变量、字体、基础元素
   ========================================================= */

:root {
  --color-white: #ffffff;
  --color-primary: #2f7d5c;
  --color-primary-dark: #25664a;
  --color-primary-light: #e8f2ed;
  --color-sand: #e5dcc8;
  --color-sand-light: #f4efe4;
  --color-sky: #8fc1c6;
  --color-sky-light: #e9f2f3;
  --color-terracotta: #c96f4a;
  --color-terracotta-light: #f7e9e2;
  --color-text: #3a3a3a;
  --color-text-light: #6b6b6b;
  --color-border: #ddd6c8;
  --color-border-light: #ece6da;

  --font-serif: "Songti SC", "Noto Serif SC", "STSong", "SimSun", serif;
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;

  --container-width: 1120px;
  --header-height: 68px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;

  --space-xs: 8px;
  --space-sm: 16px;
  --space-md: 24px;
  --space-lg: 40px;
  --space-xl: 64px;
  --space-2xl: 88px;

  --shadow-card: 0 1px 3px rgba(58, 58, 58, 0.06), 0 4px 12px rgba(58, 58, 58, 0.04);
  --shadow-hover: 0 4px 12px rgba(47, 125, 92, 0.12), 0 8px 24px rgba(58, 58, 58, 0.06);
}

*,
*::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-white);
  -webkit-font-smoothing: antialiased;
}

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

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

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-serif);
  color: var(--color-text);
  line-height: 1.35;
  font-weight: 700;
}

h1 {
  font-size: 2rem;
  line-height: 1.3;
  margin-bottom: var(--space-sm);
}

h2 {
  font-size: 1.5rem;
  margin-bottom: var(--space-sm);
}

h3 {
  font-size: 1.125rem;
  margin-bottom: var(--space-xs);
}

h4 {
  font-size: 1rem;
  margin-bottom: var(--space-xs);
}

p {
  margin-bottom: var(--space-sm);
}

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

.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding-left: var(--space-md);
  padding-right: var(--space-md);
}

/* =========================================================
   Layout — 页头、页脚、面包屑、页面标题区
   ========================================================= */

.site-header {
  background-color: var(--color-white);
  border-bottom: 1px solid var(--color-border-light);
  position: relative;
  z-index: 100;
}

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

.brand {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-serif);
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 0.02em;
  white-space: nowrap;
  flex-shrink: 0;
}

.brand:hover {
  color: var(--color-primary-dark);
  text-decoration: none;
}

.main-nav {
  flex: 1;
  display: flex;
  justify-content: center;
}

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

.nav-list li {
  position: relative;
}

.nav-list a {
  display: inline-block;
  padding: 8px 14px;
  font-size: 0.9375rem;
  color: var(--color-text);
  border-radius: var(--radius-sm);
  transition: color 0.2s ease, background-color 0.2s ease;
}

.nav-list a:hover {
  color: var(--color-primary);
  background-color: var(--color-primary-light);
  text-decoration: none;
}

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

.nav-list a.is-current::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 2px;
  height: 2px;
  background-color: var(--color-primary);
  border-radius: 1px;
}

.btn-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 9px 22px;
  background-color: var(--color-primary);
  color: var(--color-white);
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-primary);
  white-space: nowrap;
  flex-shrink: 0;
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

.btn-cta:hover {
  background-color: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  color: var(--color-white);
  text-decoration: none;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  flex-shrink: 0;
}

.nav-toggle .bar {
  display: block;
  width: 20px;
  height: 2px;
  background-color: var(--color-text);
  border-radius: 1px;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.nav-toggle[aria-expanded="true"] .bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

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

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

/* 面包屑 */
.breadcrumb {
  font-size: 0.875rem;
  color: var(--color-text-light);
  padding: 14px 0;
  background-color: var(--color-white);
  border-bottom: 1px solid var(--color-border-light);
}

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

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

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

.breadcrumb-sep {
  color: var(--color-border);
  font-size: 0.875rem;
}

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

/* 页面标题区 */
.page-header {
  background-color: var(--color-white);
}

.page-title {
  font-size: 2rem;
  line-height: 1.3;
  color: var(--color-text);
  padding: var(--space-lg) 0 var(--space-md);
  margin-bottom: 0;
}

/* =========================================================
   Components — 按钮、卡片、列表、步骤、表格、FAQ、页脚
   ========================================================= */

/* 按钮 */
.btn-primary,
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

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

.btn-primary:hover {
  background-color: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  color: var(--color-white);
  text-decoration: none;
}

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

.btn-secondary:hover {
  background-color: var(--color-primary-light);
  color: var(--color-primary-dark);
  text-decoration: none;
}

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-weight: 600;
  font-size: 0.9375rem;
}

.text-link::after {
  content: "→";
  transition: transform 0.2s ease;
}

.text-link:hover::after {
  transform: translateX(4px);
}

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

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.4fr;
  gap: var(--space-lg);
  padding-top: var(--space-xl);
  padding-bottom: var(--space-lg);
}

.footer-brand .footer-logo {
  display: inline-block;
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--space-xs);
}

.footer-brand p {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  margin-top: var(--space-xs);
}

.footer-col h4 {
  font-size: 1rem;
  font-family: var(--font-sans);
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

.footer-col ul li {
  margin-bottom: 8px;
}

.footer-col ul a {
  font-size: 0.9375rem;
  color: var(--color-text-light);
}

.footer-col ul a:hover {
  color: var(--color-primary);
}

.footer-boundary {
  background-color: var(--color-white);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: var(--space-sm) var(--space-md);
}

.footer-boundary h4 {
  font-size: 0.9375rem;
  margin-bottom: var(--space-xs);
}

.footer-boundary p {
  font-size: 0.875rem;
  color: var(--color-text-light);
  line-height: 1.65;
  margin-bottom: 0;
}

.footer-bottom {
  border-top: 1px solid var(--color-border-light);
  padding: var(--space-sm) 0;
}

.footer-bottom .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.footer-bottom p {
  font-size: 0.8125rem;
  color: var(--color-text-light);
  margin-bottom: 0;
}

.footer-bottom a {
  font-size: 0.8125rem;
  color: var(--color-text-light);
}

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

/* =========================================================
   Pages — 首页
   ========================================================= */

/* Hero */
.hero {
  background-color: var(--color-white);
  padding: var(--space-xl) 0 var(--space-lg);
  border-bottom: 1px solid var(--color-border-light);
}

.hero-grid {
  display: grid;
  grid-template-columns: 3fr 2fr;
  gap: var(--space-xl);
  align-items: center;
}

.hero-text h1 {
  font-size: 2.25rem;
  line-height: 1.3;
  margin-bottom: var(--space-sm);
}

.hero-lead {
  font-size: 1.0625rem;
  color: var(--color-text-light);
  margin-bottom: var(--space-md);
  max-width: 36em;
}

.hero-actions {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.hero-media {
  position: relative;
}

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

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

.content-media {
  border-radius: var(--radius-md);
  overflow: hidden;
}

.content-media-primary {
  margin-top: var(--space-lg);
  background-color: var(--color-sand-light);
}

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

.content-media figcaption {
  padding: 10px 16px;
  font-size: 0.875rem;
  color: var(--color-text-light);
  background-color: var(--color-white);
  border-top: 1px solid var(--color-border-light);
}

/* 主体双栏 */
.main-grid-section {
  padding: var(--space-xl) 0;
}

.two-col-grid {
  display: grid;
  grid-template-columns: 7fr 5fr;
  gap: var(--space-xl);
  align-items: start;
}

.col-services h2,
.col-audience h2 {
  font-size: 1.375rem;
  margin-bottom: var(--space-md);
}

.service-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-sm);
}

.service-list li {
  background-color: var(--color-sand-light);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: var(--space-sm) var(--space-md);
  transition: box-shadow 0.25s ease, transform 0.25s ease;
}

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

.service-list h3 {
  font-size: 1.0625rem;
  margin-bottom: 6px;
}

.service-list p {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  margin-bottom: var(--space-xs);
}

.service-list a {
  font-size: 0.875rem;
  font-weight: 600;
}

.col-audience {
  background-color: var(--color-sky-light);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: var(--space-md) var(--space-lg);
}

.audience-list {
  margin: var(--space-sm) 0 var(--space-md);
}

.audience-list li {
  position: relative;
  padding-left: 22px;
  margin-bottom: 10px;
  font-size: 0.9375rem;
}

.audience-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--color-sky);
}

/* 边界提示条 */
.boundary-strip {
  background-color: var(--color-sand-light);
  border-top: 1px solid var(--color-border-light);
  border-bottom: 1px solid var(--color-border-light);
  padding: var(--space-xl) 0;
}

.boundary-strip h2 {
  text-align: center;
  margin-bottom: var(--space-md);
}

.boundary-cols {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
  max-width: 900px;
  margin: 0 auto;
}

.boundary-allowed,
.boundary-disallowed {
  background-color: var(--color-white);
  border-radius: var(--radius-md);
  padding: var(--space-md) var(--space-lg);
  border: 1px solid var(--color-border-light);
}

.boundary-allowed h3,
.boundary-disallowed h3 {
  font-size: 1.0625rem;
  margin-bottom: var(--space-sm);
}

.boundary-allowed h3 {
  color: var(--color-primary);
}

.boundary-disallowed h3 {
  color: var(--color-terracotta);
}

.boundary-allowed ul li,
.boundary-disallowed ul li {
  position: relative;
  padding-left: 20px;
  margin-bottom: 8px;
  font-size: 0.9375rem;
}

.boundary-allowed ul li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--color-primary);
  font-weight: 700;
}

.boundary-disallowed ul li::before {
  content: "✕";
  position: absolute;
  left: 0;
  color: var(--color-terracotta);
  font-weight: 700;
}

.boundary-more {
  text-align: center;
  margin-top: var(--space-md);
}

/* 流程概览 */
.process-overview {
  padding: var(--space-xl) 0;
}

.process-overview h2 {
  text-align: center;
  margin-bottom: var(--space-lg);
}

.steps-list {
  max-width: 760px;
  margin: 0 auto;
  counter-reset: step;
}

.step {
  display: flex;
  gap: var(--space-md);
  padding: var(--space-sm) 0;
  position: relative;
}

.step:not(:last-child)::after {
  content: "";
  position: absolute;
  left: 20px;
  top: 52px;
  bottom: -8px;
  width: 2px;
  background-color: var(--color-border);
}

.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: var(--color-primary);
  color: var(--color-white);
  font-family: var(--font-serif);
  font-size: 1.0625rem;
  font-weight: 700;
  flex-shrink: 0;
  position: relative;
  z-index: 1;
}

.step-body h3 {
  font-size: 1.125rem;
  margin-bottom: 4px;
}

.step-body p {
  font-size: 0.9375rem;
  color: var(--color-text-light);
}

.process-footer {
  text-align: center;
  margin-top: var(--space-md);
}

/* FAQ 预览 */
.faq-preview {
  background-color: var(--color-white);
  border-top: 1px solid var(--color-border-light);
  padding: var(--space-xl) 0;
}

.faq-preview h2 {
  text-align: center;
  margin-bottom: var(--space-lg);
}

.faq-groups {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.faq-group {
  background-color: var(--color-sand-light);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: var(--space-md);
}

.faq-group h3 {
  font-size: 1.0625rem;
  margin-bottom: var(--space-xs);
}

.faq-group details {
  margin-bottom: var(--space-xs);
}

.faq-group summary {
  font-size: 0.9375rem;
  font-weight: 600;
  cursor: pointer;
  padding: 6px 0;
}

.faq-group summary:hover {
  color: var(--color-primary);
}

.faq-group details p {
  font-size: 0.875rem;
  color: var(--color-text-light);
  padding: 6px 0 6px 12px;
  margin-bottom: 0;
}

.faq-group a {
  display: inline-block;
  margin-top: var(--space-xs);
  font-size: 0.875rem;
  font-weight: 600;
}

/* =========================================================
   Pages — 服务项目 services.html
   ========================================================= */

.inner-main {
  background-color: var(--color-white);
}

/* 页面标题区 */
.page-title {
  border-bottom: 1px solid var(--color-border-light);
}

.title-wrap {
  display: grid;
  grid-template-columns: 3fr 2fr;
  gap: var(--space-lg);
  align-items: center;
  padding-top: var(--space-sm);
  padding-bottom: var(--space-lg);
}

.title-text p {
  font-size: 1.0625rem;
  color: var(--color-text-light);
  margin-bottom: 0;
}

.title-figure {
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: var(--color-sand-light);
}

.title-figure img {
  width: 100%;
  height: 220px;
  object-fit: cover;
}

/* 服务速览 */
.overview-grid {
  padding: var(--space-xl) 0 var(--space-lg);
}

.overview-grid h2 {
  margin-bottom: var(--space-md);
}

.overview-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.overview-item {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
  background-color: var(--color-sand-light);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  transition: box-shadow 0.25s ease;
}

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

.item-head h3 {
  font-size: 1.125rem;
  margin-bottom: 6px;
}

.item-head p {
  font-size: 0.9375rem;
  color: var(--color-text-light);
}

.item-scene {
  border-left: 2px solid var(--color-sky);
  padding-left: var(--space-sm);
}

.item-scene p {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  margin-bottom: 6px;
}

.item-scene a {
  font-size: 0.875rem;
  font-weight: 600;
}

.overview-figure {
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: var(--color-sand-light);
}

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

/* 服务详情 */
.detail-list {
  padding: var(--space-lg) 0 var(--space-xl);
  border-top: 1px solid var(--color-border-light);
}

.detail-list h2 {
  margin-bottom: var(--space-md);
}

.detail-item {
  background-color: var(--color-white);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-md);
  overflow: hidden;
}

.detail-head {
  background-color: var(--color-primary-light);
  padding: var(--space-sm) var(--space-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.detail-head h3 {
  font-size: 1.125rem;
  margin-bottom: 0;
}

.detail-tag {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--color-primary);
  background-color: var(--color-white);
  border-radius: var(--radius-sm);
  padding: 4px 10px;
  margin-bottom: 0;
}

.detail-body {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
  padding: var(--space-md);
}

.detail-col h4 {
  font-size: 0.9375rem;
  font-weight: 600;
  margin-bottom: 6px;
}

.detail-col p {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  margin-bottom: 0;
}

/* 相关链接 */
.related-links {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  flex-wrap: wrap;
  padding: var(--space-md) 0 var(--space-xl);
  border-top: 1px solid var(--color-border-light);
}

.related-links-label {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-text);
}

.related-links-item {
  display: inline-block;
  font-size: 0.9375rem;
  background-color: var(--color-sand-light);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-sm);
  padding: 6px 14px;
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

.related-links-item:hover {
  background-color: var(--color-primary-light);
  border-color: var(--color-primary);
  text-decoration: none;
}

/* =========================================================
   Pages — 报告字段 fields.html
   ========================================================= */

.page-heading {
  display: grid;
  grid-template-columns: 3fr 2fr;
  gap: var(--space-lg);
  align-items: center;
  padding-top: var(--space-sm);
  padding-bottom: var(--space-lg);
}

.heading-text p {
  font-size: 1.0625rem;
  color: var(--color-text-light);
  margin-bottom: 0;
}

.heading-figure {
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: var(--color-sand-light);
}

.heading-figure img {
  width: 100%;
  height: 220px;
  object-fit: cover;
}

.fields-section {
  padding: var(--space-lg) 0 var(--space-xl);
}

.section-head {
  margin-bottom: var(--space-md);
}

.section-head p {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  max-width: 46em;
}

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
}

.fields-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9375rem;
  min-width: 640px;
}

.fields-table thead {
  background-color: var(--color-primary);
}

.fields-table th {
  color: var(--color-white);
  font-weight: 600;
  text-align: left;
  padding: 12px 16px;
  font-family: var(--font-sans);
}

.fields-table td {
  padding: 12px 16px;
  border-top: 1px solid var(--color-border-light);
  vertical-align: top;
  line-height: 1.6;
}

.fields-table tbody tr:nth-child(even) {
  background-color: var(--color-sand-light);
}

.fields-table td:first-child {
  font-weight: 600;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  white-space: nowrap;
}

.table-note {
  font-size: 0.875rem;
  color: var(--color-text-light);
  margin-top: var(--space-xs);
}

/* 时间范围与更新方式 */
.update-block {
  padding: var(--space-lg) 0;
  border-top: 1px solid var(--color-border-light);
}

.update-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

.update-item {
  background-color: var(--color-sand-light);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: var(--space-md);
}

.update-item h2 {
  font-size: 1.25rem;
  margin-bottom: var(--space-xs);
}

.update-item p {
  font-size: 0.9375rem;
  color: var(--color-text-light);
}

.update-figure {
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: var(--color-sand-light);
}

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

/* 使用限制 */
.restriction-block {
  padding: var(--space-lg) 0 var(--space-xl);
  border-top: 1px solid var(--color-border-light);
}

.restriction-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-sm);
  margin-bottom: var(--space-sm);
}

.restriction-list li {
  background-color: var(--color-white);
  border: 1px solid var(--color-border-light);
  border-left: 3px solid var(--color-terracotta);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  font-size: 0.9375rem;
}

.restriction-note {
  font-size: 0.9375rem;
  color: var(--color-text-light);
}

.restriction-note a {
  font-weight: 600;
}

/* =========================================================
   Pages — 合作流程 process.html
   ========================================================= */

.steps-list {
  padding: var(--space-lg) 0 var(--space-xl);
}

.step-item {
  display: grid;
  grid-template-columns: 3fr 2fr;
  gap: var(--space-lg);
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--color-border-light);
}

.step-item:last-of-type {
  border-bottom: none;
}

.step-left .step-num {
  margin-bottom: var(--space-xs);
}

.step-left h2 {
  font-size: 1.375rem;
  margin-bottom: var(--space-xs);
}

.step-left > p {
  font-size: 0.9375rem;
  color: var(--color-text-light);
}

.step-actions {
  margin-top: var(--space-xs);
}

.step-actions li {
  position: relative;
  padding-left: 20px;
  margin-bottom: 6px;
  font-size: 0.9375rem;
}

.step-actions li::before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--color-primary);
  font-weight: 700;
}

.step-output {
  background-color: var(--color-sand-light);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: var(--space-sm) var(--space-md);
  align-self: start;
}

.step-output h3 {
  font-size: 1rem;
  margin-bottom: 6px;
}

.step-output p {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  margin-bottom: 0;
}

.step-figure {
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: var(--color-sand-light);
  margin: var(--space-md) 0;
}

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

/* 调整说明 */
.adjust-note {
  padding: var(--space-lg) 0 var(--space-xl);
  border-top: 1px solid var(--color-border-light);
}

.adjust-note h2 {
  font-size: 1.25rem;
  margin-bottom: var(--space-xs);
}

.adjust-note p {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  max-width: 46em;
}

/* =========================================================
   Pages — 使用准备 prepare.html
   ========================================================= */

.page-title-area {
  background-color: var(--color-white);
  border-bottom: 1px solid var(--color-border-light);
}

.page-title-grid {
  display: grid;
  grid-template-columns: 3fr 2fr;
  gap: var(--space-lg);
  align-items: center;
  padding-top: var(--space-sm);
  padding-bottom: var(--space-lg);
}

.page-title-text p {
  font-size: 1.0625rem;
  color: var(--color-text-light);
  margin-bottom: 0;
}

.page-title-figure {
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: var(--color-sand-light);
}

.page-title-figure img {
  width: 100%;
  height: 220px;
  object-fit: cover;
}

.layout-shell {
  padding: var(--space-lg) 0 var(--space-xl);
}

.page-layout {
  display: grid;
  grid-template-columns: 7fr 4fr;
  gap: var(--space-xl);
  align-items: start;
}

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

.checklist-section {
  margin-top: var(--space-md);
}

.section-intro {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  margin-bottom: var(--space-md);
}

.checklist-group {
  background-color: var(--color-sand-light);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  margin-bottom: var(--space-md);
}

.checklist-group h3 {
  font-size: 1.0625rem;
  margin-bottom: var(--space-xs);
  display: flex;
  align-items: center;
  gap: 8px;
}

.checklist-group h3::before {
  content: "";
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: var(--color-sky);
  flex-shrink: 0;
}

.checklist-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 6px 0;
  font-size: 0.9375rem;
}

.checklist-list li::before {
  content: "□";
  color: var(--color-primary);
  font-weight: 700;
  flex-shrink: 0;
  font-size: 1rem;
  line-height: 1.5;
}

/* 侧栏 */
.sidebar-area {
  min-width: 0;
}

.nogo-section {
  background-color: var(--color-terracotta-light);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: var(--space-md) var(--space-lg);
}

.nogo-section h2 {
  font-size: 1.125rem;
  color: var(--color-terracotta);
  margin-bottom: 6px;
}

.nogo-section .section-intro {
  font-size: 0.9375rem;
  margin-bottom: var(--space-sm);
}

.nogo-list li {
  position: relative;
  padding-left: 20px;
  margin-bottom: 10px;
  font-size: 0.9375rem;
}

.nogo-list li::before {
  content: "✕";
  position: absolute;
  left: 0;
  color: var(--color-terracotta);
  font-weight: 700;
}

/* 下一步提示 */
.next-step-note {
  background-color: var(--color-primary-light);
  border-top: 1px solid var(--color-border-light);
  padding: var(--space-md) 0;
}

.next-step-note p {
  font-size: 0.9375rem;
  margin-bottom: var(--space-xs);
}

.next-links {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.next-links a {
  font-size: 0.9375rem;
  font-weight: 600;
}

/* =========================================================
   Pages — 信息边界 boundary.html
   ========================================================= */

.page-title-block {
  background-color: var(--color-white);
  border-bottom: 1px solid var(--color-border-light);
}

.page-title-inner {
  display: grid;
  grid-template-columns: 3fr 2fr;
  gap: var(--space-lg);
  align-items: center;
  padding-top: var(--space-sm);
  padding-bottom: var(--space-lg);
}

.page-title-text p {
  font-size: 1.0625rem;
  color: var(--color-text-light);
  margin-bottom: 0;
}

.allowed-section,
.not-allowed-section,
.handling-section {
  padding: var(--space-lg) 0;
}

.section-heading {
  margin-bottom: var(--space-md);
}

.section-heading h2 {
  font-size: 1.375rem;
  margin-bottom: 6px;
}

.section-heading p {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  max-width: 46em;
}

.allowed-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-md);
}

.boundary-card {
  background-color: var(--color-sand-light);
  border: 1px solid var(--color-border-light);
  border-top: 3px solid var(--color-primary);
  border-radius: var(--radius-md);
  padding: var(--space-md);
}

.boundary-card h3 {
  font-size: 1.0625rem;
  margin-bottom: 6px;
}

.boundary-card p {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  margin-bottom: 0;
}

.not-allowed-section {
  background-color: var(--color-sand-light);
  border-top: 1px solid var(--color-border-light);
  border-bottom: 1px solid var(--color-border-light);
}

.not-allowed-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-sm);
}

.not-allowed-list li {
  background-color: var(--color-white);
  border: 1px solid var(--color-border-light);
  border-left: 3px solid var(--color-terracotta);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  font-size: 0.9375rem;
}

.handling-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}

.handling-item {
  background-color: var(--color-white);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  box-shadow: var(--shadow-card);
}

.handling-item h3 {
  font-size: 1.0625rem;
  margin-bottom: 6px;
  color: var(--color-primary);
}

.handling-item p {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  margin-bottom: 0;
}

/* =========================================================
   Pages — 常见问题 faq.html
   ========================================================= */

.faq-groups {
  display: block;
  padding: var(--space-xl) 0;
}

.faq-group {
  margin-bottom: var(--space-xl);
}

.faq-group:last-child {
  margin-bottom: 0;
}

.faq-group-head {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-sm);
  padding-bottom: var(--space-xs);
  border-bottom: 2px solid var(--color-border-light);
}

.faq-group-tag {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-primary);
  color: var(--color-white);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}

.faq-group-head h2 {
  font-size: 1.25rem;
  margin-bottom: 0;
}

.faq-group-head p {
  font-size: 0.875rem;
  color: var(--color-text-light);
  margin-bottom: 0;
  margin-left: auto;
}

.faq-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-sm);
}

.faq-list details {
  background-color: var(--color-white);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: 0;
  overflow: hidden;
  transition: box-shadow 0.2s ease;
}

.faq-list details:hover {
  box-shadow: var(--shadow-card);
}

.faq-list details[open] {
  box-shadow: var(--shadow-card);
  border-color: var(--color-sky);
}

.faq-list summary {
  cursor: pointer;
  padding: 14px 16px;
  font-size: 0.9375rem;
  font-weight: 600;
  position: relative;
  padding-right: 40px;
  list-style: none;
}

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

.faq-list summary::after {
  content: "+";
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.25rem;
  color: var(--color-primary);
  font-weight: 400;
  transition: transform 0.2s ease;
}

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

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

.faq-answer {
  padding: 0 16px 14px;
  border-top: 1px solid var(--color-border-light);
}

.faq-answer p {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  padding-top: 12px;
  margin-bottom: 0;
}

/* 反馈说明 */
.feedback-note {
  background-color: var(--color-sand-light);
  border-top: 1px solid var(--color-border-light);
  padding: var(--space-md) 0;
  margin-top: var(--space-lg);
}

.feedback-note p {
  font-size: 0.9375rem;
  margin-bottom: 0;
}

.feedback-note a {
  font-weight: 600;
}

/* =========================================================
   Pages — 404
   ========================================================= */

.error-main {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-xl) 0;
  background-color: var(--color-white);
}

.error-content {
  text-align: center;
  max-width: 560px;
  padding: var(--space-xl) var(--space-md);
}

.error-code {
  font-family: var(--font-serif);
  font-size: 4rem;
  font-weight: 700;
  color: var(--color-sand);
  line-height: 1;
  margin-bottom: var(--space-sm);
}

.error-content h1 {
  font-size: 1.5rem;
  margin-bottom: var(--space-sm);
}

.error-content p {
  font-size: 0.9375rem;
  color: var(--color-text-light);
}

.error-actions {
  display: flex;
  justify-content: center;
  gap: var(--space-sm);
  margin-top: var(--space-md);
  flex-wrap: wrap;
}

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

@media (max-width: 1024px) {
  .container {
    padding-left: var(--space-md);
    padding-right: var(--space-md);
  }

  .nav-list a {
    padding: 8px 10px;
    font-size: 0.875rem;
  }

  .btn-cta {
    padding: 9px 16px;
    font-size: 0.875rem;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
  }

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

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

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

  .detail-body {
    grid-template-columns: 1fr;
    gap: var(--space-sm);
  }

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

  .step-item {
    grid-template-columns: 1fr;
    gap: var(--space-sm);
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 60px;
  }

  h1 {
    font-size: 1.625rem;
  }

  h2 {
    font-size: 1.25rem;
  }

  .site-header {
    position: sticky;
    top: 0;
  }

  .nav-toggle {
    display: flex;
  }

  .btn-cta {
    display: none;
  }

  .main-nav {
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background-color: var(--color-white);
    border-bottom: 1px solid var(--color-border-light);
    box-shadow: 0 8px 16px rgba(58, 58, 58, 0.08);
    display: block;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
    z-index: 99;
  }

  .main-nav:has(.nav-list.is-open) {
    max-height: calc(100vh - var(--header-height));
    overflow-y: auto;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    padding: var(--space-sm) 0;
    gap: 0;
    display: none;
  }

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

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

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

  .nav-list a {
    display: block;
    padding: 14px var(--space-md);
    font-size: 1rem;
    border-radius: 0;
  }

  .nav-list a.is-current::after {
    content: none;
  }

  .nav-list a.is-current {
    background-color: var(--color-primary-light);
  }

  /* Hero */
  .hero-grid {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

  .hero-text h1 {
    font-size: 1.75rem;
  }

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

  .content-media-primary {
    margin-top: var(--space-sm);
  }

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

  /* 主体双栏 */
  .two-col-grid {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

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

  .col-audience {
    order: -1;
  }

  /* 边界提示条 */
  .boundary-cols {
    grid-template-columns: 1fr;
    gap: var(--space-sm);
  }

  /* 流程 */
  .step {
    gap: var(--space-sm);
  }

  .step-num {
    width: 36px;
    height: 36px;
    font-size: 0.9375rem;
  }

  .step:not(:last-child)::after {
    left: 18px;
  }

  /* FAQ */
  .faq-groups {
    grid-template-columns: 1fr;
    gap: var(--space-sm);
  }

  /* 内页标题区 */
  .title-wrap,
  .page-heading,
  .page-title-grid,
  .page-title-inner {
    grid-template-columns: 1fr;
    gap: var(--space-sm);
  }

  .title-figure img,
  .heading-figure img,
  .page-title-figure img {
    height: 180px;
  }

  /* 服务速览 */
  .overview-list {
    grid-template-columns: 1fr;
  }

  .overview-figure img {
    height: 200px;
  }

  .detail-body {
    grid-template-columns: 1fr;
  }

  /* 字段表格 */
  .table-wrap {
    overflow-x: auto;
  }

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

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

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

  .restriction-list {
    grid-template-columns: 1fr;
  }

  /* 流程 */
  .step-item {
    grid-template-columns: 1fr;
  }

  .step-figure img {
    height: 200px;
  }

  /* 使用准备 */
  .page-layout {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  .sidebar-area {
    order: 2;
  }

  .main-content {
    order: 1;
  }

  /* 边界 */
  .allowed-grid {
    grid-template-columns: 1fr;
  }

  .not-allowed-list {
    grid-template-columns: 1fr;
  }

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

  /* FAQ */
  .faq-group-head {
    flex-wrap: wrap;
  }

  .faq-group-head p {
    margin-left: 0;
    width: 100%;
  }

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

  /* 页脚 */
  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

  .footer-bottom .container {
    flex-direction: column;
    gap: 6px;
    text-align: center;
  }

  /* 相关链接 */
  .related-links {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 480px) {
  .container {
    padding-left: var(--space-sm);
    padding-right: var(--space-sm);
  }

  h1 {
    font-size: 1.5rem;
    line-height: 1.35;
  }

  .hero-text h1 {
    font-size: 1.5rem;
  }

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

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

  .step {
    flex-direction: column;
    gap: 6px;
  }

  .step:not(:last-child)::after {
    content: none;
  }

  .step-num {
    width: 32px;
    height: 32px;
    font-size: 0.875rem;
  }

  .error-code {
    font-size: 3rem;
  }

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

/* =========================================================
   动效 — 滚动淡入（不阻塞首屏）
   ========================================================= */

@media (prefers-reduced-motion: no-preference) {
  .hero-text,
  .hero-media,
  .col-services,
  .col-audience,
  .boundary-allowed,
  .boundary-disallowed,
  .step,
  .faq-group,
  .overview-item,
  .detail-item,
  .update-item,
  .restriction-list li,
  .boundary-card,
  .handling-item,
  .checklist-group,
  .nogo-section {
    animation: fadeInUp 0.5s ease both;
  }

  .hero-text {
    animation-delay: 0.05s;
  }

  .hero-media {
    animation-delay: 0.1s;
  }

  .col-services {
    animation-delay: 0.1s;
  }

  .col-audience {
    animation-delay: 0.15s;
  }

  .boundary-allowed {
    animation-delay: 0.1s;
  }

  .boundary-disallowed {
    animation-delay: 0.15s;
  }

  .step:nth-child(2) {
    animation-delay: 0.1s;
  }

  .step:nth-child(3) {
    animation-delay: 0.15s;
  }

  .step:nth-child(4) {
    animation-delay: 0.2s;
  }

  .faq-group:nth-child(2) {
    animation-delay: 0.1s;
  }

  .faq-group:nth-child(3) {
    animation-delay: 0.15s;
  }
}

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