/* ============================================================
   51吃瓜网网站 - 整站样式
   视觉方向：物流运营控制台，冷静专业、信息密度高
   主色 #0B2B4A / 强调色 #F4A100 / 异常色 #D64545
   ============================================================ */

/* ============================================================
   Base
   ============================================================ */
:root {
  --color-primary: #0B2B4A;
  --color-primary-light: #123a5e;
  --color-primary-dark: #071f36;
  --color-accent: #F4A100;
  --color-accent-hover: #d98f00;
  --color-bg: #F5F7FA;
  --color-card: #FFFFFF;
  --color-danger: #D64545;
  --color-text: #1f2d3a;
  --color-text-secondary: #5A6B7B;
  --color-border: #e2e8f0;
  --color-border-dark: #cbd5e1;
  --color-status-bg: #eef4fb;
  --font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'Consolas', 'Courier New', monospace;
  --container-width: 1200px;
  --radius: 8px;
  --radius-sm: 6px;
  --shadow-sm: 0 1px 2px rgba(11, 43, 74, 0.06);
  --shadow-md: 0 4px 12px rgba(11, 43, 74, 0.08);
  --transition: 0.2s ease;
}

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

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

body {
  font-family: var(--font-family);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

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

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

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

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

h1, h2, h3, h4 {
  font-weight: 700;
  line-height: 1.35;
  color: var(--color-primary);
}

h1 {
  font-size: 32px;
}

h2 {
  font-size: 24px;
}

h3 {
  font-size: 20px;
}

p {
  margin-bottom: 12px;
}

/* ============================================================
   Layout 骨架 — 全站统一
   ============================================================ */
.site-body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background-color: var(--color-bg);
}

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

.header-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  gap: 24px;
}

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

.site-main.inner-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 32px 20px 64px;
  width: 100%;
}

.site-footer {
  background-color: var(--color-primary-dark);
  color: rgba(255, 255, 255, 0.8);
  margin-top: auto;
}

.footer-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 20px 24px;
}

/* ============================================================
   页头组件
   ============================================================ */
.brand-link {
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex-shrink: 0;
  line-height: 1.2;
}

.brand-link:hover {
  color: inherit;
}

.brand-name {
  font-size: 22px;
  font-weight: 700;
  color: #ffffff;
  letter-spacing: 0.5px;
}

.brand-tagline {
  font-size: 12px;
  color: rgba(255, 255, 255, 0.65);
}

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

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

.nav-item {
  position: relative;
}

.nav-link {
  display: block;
  padding: 8px 14px;
  font-size: 15px;
  color: rgba(255, 255, 255, 0.85);
  border-radius: var(--radius-sm);
  position: relative;
  transition: color var(--transition), background-color var(--transition);
}

.nav-link::after {
  content: '';
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 2px;
  height: 2px;
  background-color: var(--color-accent);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--transition);
  border-radius: 2px;
}

.nav-link:hover {
  color: #ffffff;
  background-color: rgba(255, 255, 255, 0.08);
}

.nav-link:hover::after {
  transform: scaleX(1);
}

.nav-link.is-current {
  color: #ffffff;
  font-weight: 600;
}

.nav-link.is-current::after {
  transform: scaleX(1);
}

.header-tools {
  display: flex;
  gap: 10px;
  flex-shrink: 0;
}

.tool-link {
  display: inline-flex;
  align-items: center;
  padding: 8px 16px;
  font-size: 14px;
  border-radius: var(--radius-sm);
  transition: background-color var(--transition), color var(--transition);
}

.tool-link:first-child {
  background-color: var(--color-accent);
  color: var(--color-primary-dark);
  font-weight: 600;
}

.tool-link:first-child:hover {
  background-color: var(--color-accent-hover);
  color: var(--color-primary-dark);
}

.tool-link:last-child {
  color: rgba(255, 255, 255, 0.85);
  border: 1px solid rgba(255, 255, 255, 0.3);
}

.tool-link:last-child:hover {
  color: #ffffff;
  border-color: rgba(255, 255, 255, 0.6);
}

/* ============================================================
   面包屑
   ============================================================ */
.breadcrumb {
  font-size: 14px;
  color: var(--color-text-secondary);
  padding: 0 0 20px;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
}

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

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

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

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

.breadcrumb-nav {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 16px 20px 0;
  font-size: 14px;
}

.breadcrumb-list {
  display: flex;
  list-style: none;
  gap: 6px;
}

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

/* ============================================================
   页面标题区（内页统一）
   ============================================================ */
.page-header {
  padding-bottom: 12px;
}

.page-title {
  font-size: 32px;
  font-weight: 700;
  color: var(--color-primary);
}

.page-title-area,
.page-title-section {
  padding: 0 0 32px;
  max-width: 860px;
}

.page-title-desc,
.page-desc,
.page-lead {
  font-size: 16px;
  color: var(--color-text-secondary);
  margin-top: 8px;
}

/* ============================================================
   通用组件 — 状态标签
   ============================================================ */
.status-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 500;
  padding: 4px 12px;
  border-radius: 20px;
  line-height: 1.4;
}

.status-tag.published,
.status-tag.is-published,
.status-tag.status-published {
  background-color: rgba(11, 43, 74, 0.08);
  color: var(--color-primary);
}

.status-tag.updated,
.status-tag.is-updated,
.status-tag.status-updated {
  background-color: rgba(244, 161, 0, 0.12);
  color: #b87a00;
}

.status-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--color-accent);
  margin-right: 8px;
  vertical-align: middle;
  position: relative;
}

.status-dot::after {
  content: '';
  position: absolute;
  inset: -3px;
  border-radius: 50%;
  border: 1px solid var(--color-accent);
  opacity: 0.5;
}

/* ============================================================
   通用组件 — 按钮与链接
   ============================================================ */
.btn-primary,
.btn-secondary,
.cta-button,
.action-button,
.error-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius);
  transition: background-color var(--transition), color var(--transition), border-color var(--transition);
  min-height: 44px;
}

.btn-primary,
.cta-button,
.action-button {
  background-color: var(--color-accent);
  color: var(--color-primary-dark);
  border: 1px solid var(--color-accent);
}

.btn-primary:hover,
.cta-button:hover,
.action-button:hover {
  background-color: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
  color: var(--color-primary-dark);
}

.btn-secondary {
  background-color: transparent;
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.45);
}

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

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-primary);
}

.text-link::after {
  content: '→';
  transition: transform var(--transition);
}

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

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

/* ============================================================
   通用组件 — 区块标题
   ============================================================ */
.section-header,
.section-head {
  margin-bottom: 28px;
}

.section-header h2,
.section-head h2,
.section-title {
  font-size: 24px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.section-desc,
.section-lead,
.section-intro {
  font-size: 15px;
  color: var(--color-text-secondary);
  max-width: 760px;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ============================================================
   通用组件 — 表格
   ============================================================ */
.table-wrapper {
  overflow-x: auto;
  background-color: var(--color-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
}

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

table thead th {
  background-color: var(--color-primary);
  color: #ffffff;
  font-weight: 600;
  font-size: 14px;
  white-space: nowrap;
}

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

table tbody tr:hover {
  background-color: rgba(11, 43, 74, 0.02);
}

table tbody th {
  font-weight: 600;
  color: var(--color-primary);
  background-color: rgba(11, 43, 74, 0.03);
  white-space: nowrap;
}

/* ============================================================
   通用组件 — FAQ
   ============================================================ */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-item {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
}

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

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

.faq-item summary::after {
  content: '+';
  font-size: 22px;
  font-weight: 400;
  color: var(--color-accent);
  transition: transform var(--transition);
  flex-shrink: 0;
  margin-left: 16px;
}

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

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

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

.faq-answer p {
  color: var(--color-text-secondary);
  font-size: 15px;
}

/* ============================================================
   通用组件 — 步骤
   ============================================================ */
.step-list {
  list-style: none;
  counter-reset: step-counter;
}

/* ============================================================
   通用组件 — 相关任务
   ============================================================ */
.related-tasks,
.related-tasks-section {
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid var(--color-border);
}

.related-tasks h2,
.related-tasks-section h2 {
  font-size: 20px;
  margin-bottom: 20px;
}

.related-tasks-grid,
.task-card-grid,
.task-cards,
.related-task-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

.task-card,
.related-task-card {
  display: block;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px;
  transition: box-shadow var(--transition), border-color var(--transition), transform var(--transition);
}

.task-card:hover,
.related-task-card:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.task-card h3,
.related-task-title {
  font-size: 16px;
  margin-bottom: 8px;
  color: var(--color-primary);
}

.task-card p,
.related-task-desc {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: 0;
  line-height: 1.6;
}

/* ============================================================
   首页 Hero
   ============================================================ */
.hero-section {
  background-color: var(--color-primary);
  color: #ffffff;
  padding: 64px 0;
}

.hero-content {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
}

.hero-text {
  color: #ffffff;
}

.hero-status {
  display: inline-flex;
  align-items: center;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.85);
  background-color: rgba(255, 255, 255, 0.1);
  padding: 6px 16px;
  border-radius: 20px;
  margin-bottom: 20px;
}

.hero-status .status-dot {
  background-color: #4ade80;
}

.hero-status .status-dot::after {
  border-color: #4ade80;
}

.hero-text h1 {
  font-size: 36px;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 16px;
  line-height: 1.3;
}

.hero-desc {
  font-size: 16px;
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: 28px;
  max-width: 540px;
  line-height: 1.7;
}

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

.hero-figure {
  margin: 0;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.25);
  background-color: var(--color-primary-light);
}

.hero-image {
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

/* ============================================================
   首页 — 服务状态总览
   ============================================================ */
.service-status-section,
.comparison-section,
.usage-section,
.updates-section,
.cooperation-section,
.faq-section {
  padding: 56px 0;
}

.service-status-section {
  background-color: var(--color-bg);
}

.service-status-section .section-header,
.comparison-section .section-header,
.usage-section .section-header,
.updates-section .section-header,
.cooperation-section .section-header,
.faq-section .section-header {
  max-width: var(--container-width);
  margin: 0 auto 28px;
  padding: 0 20px;
}

.service-card-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px;
}

.service-card {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
  transition: box-shadow var(--transition), transform var(--transition);
}

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

.service-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  background-color: rgba(11, 43, 74, 0.06);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  position: relative;
}

.icon-pulse {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: var(--color-accent);
}

.icon-pulse::after {
  content: '';
  position: absolute;
  inset: -4px;
  border-radius: 50%;
  border: 2px solid var(--color-accent);
  opacity: 0.4;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 0.4; }
  50% { opacity: 0.1; }
}

.service-card h3 {
  font-size: 17px;
  margin-bottom: 8px;
}

.service-summary {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: 14px;
  line-height: 1.6;
}

.service-status {
  font-size: 13px;
  color: var(--color-text-secondary);
}

/* ============================================================
   首页 — 服务比较表
   ============================================================ */
.comparison-section {
  background-color: var(--color-card);
}

.comparison-section .table-wrapper {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px;
  background: transparent;
  border: none;
  box-shadow: none;
}

.comparison-table {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
}

/* ============================================================
   首页 — 使用场景
   ============================================================ */
.usage-section {
  background-color: var(--color-bg);
}

.usage-card-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px;
}

.usage-card {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: box-shadow var(--transition);
}

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

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

.usage-figure img {
  width: 100%;
  height: 180px;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.usage-card:hover .usage-figure img {
  transform: scale(1.03);
}

.usage-body {
  padding: 20px;
}

.usage-body h3 {
  font-size: 17px;
  margin-bottom: 8px;
}

.usage-body p {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: 12px;
  line-height: 1.6;
}

/* ============================================================
   首页 — 更新动态时间线
   ============================================================ */
.updates-section {
  background-color: var(--color-card);
}

.timeline {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px;
  position: relative;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 20px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background-color: var(--color-border);
}

.timeline-item {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 20px;
  padding-bottom: 28px;
  position: relative;
}

.timeline-marker {
  display: flex;
  justify-content: center;
  padding-top: 4px;
}

.timeline-item .status-tag {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0;
  position: relative;
  z-index: 1;
}

.timeline-item .status-tag::before {
  content: '';
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: var(--color-accent);
}

.timeline-item .status-tag.updated::before {
  background-color: var(--color-accent);
}

.timeline-content h3 {
  font-size: 16px;
  margin-bottom: 4px;
}

.timeline-date {
  font-size: 13px;
  color: var(--color-text-secondary);
  margin-bottom: 6px;
}

.timeline-content p:last-child {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: 0;
  line-height: 1.6;
}

.section-footer-link {
  max-width: var(--container-width);
  margin: 8px auto 0;
  padding: 0 20px;
}

/* ============================================================
   首页 — 合作流程速览
   ============================================================ */
.cooperation-section {
  background-color: var(--color-bg);
}

.cooperation-section .step-list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  max-width: var(--container-width);
  margin: 0 auto 32px;
  padding: 0 20px;
  counter-reset: step-counter;
}

.cooperation-section .step-item {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
  position: relative;
  counter-increment: step-counter;
  transition: box-shadow var(--transition), transform var(--transition);
}

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

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

.cooperation-section .step-item h3 {
  font-size: 16px;
  margin-bottom: 6px;
}

.cooperation-section .step-item p {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: 0;
  line-height: 1.6;
}

.cooperation-cta {
  text-align: center;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px;
}

/* ============================================================
   首页 — 页脚
   ============================================================ */
.footer-top {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 40px;
  padding-bottom: 32px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand-name {
  font-size: 20px;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 8px;
}

.footer-brand-desc {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.6);
  line-height: 1.6;
  max-width: 360px;
}

.footer-nav-list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(4, auto);
  gap: 10px 24px;
}

.footer-nav-list a {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.7);
  padding: 4px 0;
  display: inline-block;
}

.footer-nav-list a:hover {
  color: var(--color-accent);
}

.footer-bottom {
  padding-top: 24px;
  text-align: center;
}

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

/* ============================================================
   服务目录页
   ============================================================ */
.service-list-section,
.comparison-section,
.access-guide-section {
  margin-bottom: 48px;
}

.service-list-section .section-title,
.comparison-section .section-title,
.access-guide-section .section-title {
  font-size: 24px;
  margin-bottom: 8px;
}

.service-list-section .section-lead,
.comparison-section .section-lead,
.access-guide-section .section-lead {
  margin-bottom: 24px;
}

.service-list-section .service-card {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 24px;
  margin-bottom: 20px;
  padding: 0;
  overflow: hidden;
  align-items: stretch;
}

.service-card-media {
  margin: 0;
  overflow: hidden;
  background-color: var(--color-primary-light);
}

.service-card-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  min-height: 200px;
}

.service-card-body {
  padding: 24px 24px 24px 0;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.service-card-head {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 10px;
  flex-wrap: wrap;
}

.service-card-title {
  font-size: 20px;
  margin: 0;
}

.service-card-summary {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: 14px;
  line-height: 1.6;
}

.service-scene {
  margin-bottom: 16px;
}

.scene-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 6px;
}

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

.scene-list li {
  font-size: 14px;
  color: var(--color-text-secondary);
  padding: 4px 0;
  position: relative;
  padding-left: 18px;
  line-height: 1.5;
}

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

.access-guide-section {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 32px;
}

.section-note {
  font-size: 15px;
  color: var(--color-text-secondary);
  margin-bottom: 20px;
  max-width: 720px;
}

/* ============================================================
   字段说明页
   ============================================================ */
.field-table-section,
.field-example-section,
.data-format-section {
  margin-bottom: 48px;
}

.field-table-section h2,
.field-example-section h2,
.data-format-section h2 {
  font-size: 24px;
  margin-bottom: 8px;
}

.section-intro {
  margin-bottom: 20px;
}

.field-table {
  font-family: var(--font-mono);
  font-size: 14px;
}

.field-table td.field-name {
  font-weight: 600;
  color: var(--color-primary);
}

.field-table td.field-type {
  color: var(--color-accent);
}

.field-table td.field-example {
  font-size: 13px;
  color: var(--color-text-secondary);
  word-break: break-all;
}

.field-example-figure {
  margin: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
}

.field-example-img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 7;
  object-fit: cover;
}

.field-example-figure figcaption {
  padding: 12px 16px;
  font-size: 14px;
  color: var(--color-text-secondary);
  background-color: var(--color-card);
  border-top: 1px solid var(--color-border);
}

.format-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.format-item {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
}

.format-item h3 {
  font-size: 16px;
  margin-bottom: 6px;
}

.format-item p {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: 12px;
}

.format-code {
  font-family: var(--font-mono);
  font-size: 13px;
  background-color: var(--color-primary);
  color: #e2e8f0;
  border-radius: var(--radius-sm);
  padding: 16px;
  overflow-x: auto;
  line-height: 1.6;
}

/* ============================================================
   使用示例页
   ============================================================ */
.scenario-article {
  margin-bottom: 56px;
}

.scenario-content {
  max-width: 860px;
}

.scenario-header {
  margin-bottom: 20px;
}

.scenario-header h2 {
  font-size: 24px;
  margin-bottom: 8px;
}

.scenario-summary {
  font-size: 15px;
  color: var(--color-text-secondary);
}

.scenario-figure {
  margin: 0 0 24px;
  border-radius: var(--radius);
  overflow: hidden;
  background-color: var(--color-primary-light);
}

.scenario-figure img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 8;
  object-fit: cover;
}

.scenario-figure figcaption {
  padding: 10px 16px;
  font-size: 13px;
  color: var(--color-text-secondary);
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-top: none;
}

.scenario-steps {
  margin-bottom: 20px;
}

.scenario-steps h3 {
  font-size: 18px;
  margin-bottom: 16px;
}

.scenario-steps .step-list {
  list-style: none;
  counter-reset: step-counter;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.scenario-steps .step-item {
  display: flex;
  gap: 16px;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 16px;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.scenario-steps .step-item:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-sm);
}

.step-number {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  background-color: var(--color-primary);
  color: #ffffff;
  font-size: 15px;
  font-weight: 700;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.step-body {
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  padding-top: 2px;
}

.scenario-conclusion {
  font-size: 15px;
  color: var(--color-text);
  background-color: rgba(244, 161, 0, 0.08);
  border-left: 3px solid var(--color-accent);
  padding: 16px 20px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.conclusion-section {
  max-width: 860px;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 32px;
  margin-bottom: 48px;
}

.conclusion-section h2 {
  font-size: 20px;
  margin-bottom: 12px;
}

.conclusion-section p {
  font-size: 15px;
  color: var(--color-text-secondary);
}

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

.related-item {
  margin-bottom: 12px;
}

.related-item a {
  display: block;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 16px 20px;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.related-item a:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-sm);
}

.related-title {
  display: block;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 4px;
}

.related-desc {
  display: block;
  font-size: 13px;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

/* ============================================================
   更新动态页
   ============================================================ */
.update-timeline,
.version-note,
.version-nav,
.feedback-note {
  margin-bottom: 48px;
}

.update-timeline .section-title,
.version-note .section-title,
.version-nav .section-title,
.feedback-note .section-title {
  font-size: 24px;
  margin-bottom: 24px;
}

.timeline-list {
  position: relative;
  padding-left: 32px;
}

.timeline-list::before {
  content: '';
  position: absolute;
  left: 11px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background-color: var(--color-border);
}

.timeline-item {
  display: grid;
  grid-template-columns: 24px 1fr;
  gap: 16px;
  padding-bottom: 28px;
  position: relative;
}

.timeline-node {
  display: flex;
  justify-content: center;
}

.timeline-node .status-tag {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  padding: 0;
  font-size: 0;
  position: relative;
  z-index: 1;
}

.timeline-node .status-tag::before {
  content: '';
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.timeline-node .status-tag.status-published::before {
  background-color: var(--color-primary);
}

.timeline-node .status-tag.status-updated::before {
  background-color: var(--color-accent);
}

.timeline-title {
  font-size: 16px;
  margin-bottom: 4px;
}

.timeline-date {
  font-size: 13px;
  color: var(--color-text-secondary);
  margin-bottom: 6px;
}

.timeline-desc {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 0;
}

.version-note-grid {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 24px;
  align-items: start;
}

.version-figure {
  margin: 0;
  border-radius: var(--radius);
  overflow: hidden;
  background-color: var(--color-primary-light);
}

.version-figure img {
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.version-figure figcaption {
  padding: 8px 12px;
  font-size: 13px;
  color: var(--color-text-secondary);
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-top: none;
}

.version-note-content p {
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.version-nav .section-desc {
  margin-bottom: 20px;
}

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

.version-card {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.version-card-title {
  font-size: 17px;
  margin-bottom: 8px;
}

.version-card-status {
  margin-bottom: 10px;
}

.version-card-desc {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 16px;
  flex: 1;
}

.version-card-link {
  font-size: 14px;
  font-weight: 500;
}

.feedback-note {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 32px;
}

.feedback-note p {
  font-size: 15px;
  color: var(--color-text-secondary);
  max-width: 720px;
}

/* ============================================================
   引用规则页
   ============================================================ */
.citation-format,
.authorization-boundary,
.notice-list {
  margin-bottom: 48px;
}

.citation-format .section-head h2,
.authorization-boundary .section-head h2,
.notice-list .section-head h2 {
  font-size: 24px;
  margin-bottom: 8px;
}

.citation-format .section-head .section-desc,
.authorization-boundary .section-head .section-desc,
.notice-list .section-head .section-desc {
  margin-bottom: 24px;
}

.format-block {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 24px;
  align-items: start;
}

.format-figure {
  margin: 0;
  border-radius: var(--radius);
  overflow: hidden;
  background-color: var(--color-primary-light);
}

.format-figure img {
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.format-figure figcaption {
  padding: 8px 12px;
  font-size: 13px;
  color: var(--color-text-secondary);
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-top: none;
}

.format-content h3 {
  font-size: 16px;
  margin-bottom: 8px;
  margin-top: 16px;
}

.format-content h3:first-child {
  margin-top: 0;
}

.format-content p {
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.code-sample {
  background-color: var(--color-primary);
  border-radius: var(--radius-sm);
  padding: 16px;
  margin: 12px 0;
  overflow-x: auto;
}

.code-sample code {
  font-family: var(--font-mono);
  font-size: 13px;
  color: #e2e8f0;
  line-height: 1.6;
  display: block;
  white-space: pre-wrap;
  word-break: break-all;
}

.boundary-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.boundary-column {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
}

.boundary-column h3 {
  font-size: 17px;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--color-border);
}

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

.boundary-list li {
  font-size: 15px;
  color: var(--color-text-secondary);
  padding: 8px 0;
  padding-left: 28px;
  position: relative;
  line-height: 1.6;
  border-bottom: 1px dashed var(--color-border);
}

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

.boundary-list li::before {
  content: '';
  position: absolute;
  left: 4px;
  top: 16px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.allow-list li::before {
  background-color: #4ade80;
}

.forbid-list li::before {
  background-color: var(--color-danger);
}

.notice-items {
  list-style: none;
  counter-reset: notice-counter;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.notice-item {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px 24px;
  counter-increment: notice-counter;
  position: relative;
  padding-left: 64px;
}

.notice-item::before {
  content: counter(notice-counter);
  position: absolute;
  left: 20px;
  top: 20px;
  width: 28px;
  height: 28px;
  background-color: var(--color-primary);
  color: #ffffff;
  font-size: 14px;
  font-weight: 700;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.notice-item h3 {
  font-size: 16px;
  margin-bottom: 4px;
}

.notice-item p {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: 0;
  line-height: 1.6;
}

/* ============================================================
   合作流程页
   ============================================================ */
.section-block {
  margin-bottom: 48px;
}

.cooperation-steps .section-title,
.material-guide .section-title,
.file-precheck .section-title,
.faq-section .section-title {
  font-size: 24px;
  margin-bottom: 8px;
}

.cooperation-steps .section-intro,
.material-guide .section-intro,
.file-precheck .section-intro,
.faq-section .section-intro {
  margin-bottom: 24px;
}

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

.step-card {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
  transition: box-shadow var(--transition), transform var(--transition);
}

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

.step-card .step-number {
  margin-bottom: 12px;
}

.step-card h3 {
  font-size: 16px;
  margin-bottom: 8px;
}

.step-desc {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 12px;
}

.step-material {
  font-size: 13px;
  color: var(--color-accent);
  background-color: rgba(244, 161, 0, 0.08);
  border-radius: var(--radius-sm);
  padding: 6px 10px;
  display: inline-block;
  line-height: 1.4;
}

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

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

.material-item h3 {
  font-size: 16px;
  margin-bottom: 6px;
}

.material-purpose {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: 4px;
  line-height: 1.6;
}

.material-prepare {
  font-size: 14px;
  color: var(--color-primary);
  line-height: 1.6;
  margin-bottom: 0;
}

.precheck-panel {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 24px;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
}

.precheck-visual {
  margin: 0;
  border-radius: var(--radius-sm);
  overflow: hidden;
  background-color: var(--color-primary-light);
}

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

.precheck-area {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.precheck-tip {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: 16px;
  line-height: 1.6;
}

.file-select-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  background-color: var(--color-primary);
  color: #ffffff;
  font-size: 15px;
  font-weight: 500;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background-color var(--transition);
  min-height: 44px;
}

.file-select-btn:hover {
  background-color: var(--color-primary-light);
}

.btn-icon {
  font-size: 18px;
  line-height: 1;
}

.btn-text {
  font-size: 15px;
}

.precheck-file-list {
  list-style: none;
  margin-top: 16px;
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.precheck-file-item {
  display: flex;
  align-items: center;
  gap: 12px;
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
}

.file-name {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-primary);
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.file-size {
  font-size: 13px;
  color: var(--color-text-secondary);
  flex-shrink: 0;
}

.file-remove-btn {
  border: none;
  background: none;
  color: var(--color-danger);
  font-size: 20px;
  cursor: pointer;
  padding: 4px 8px;
  line-height: 1;
  border-radius: 4px;
  transition: background-color var(--transition);
  flex-shrink: 0;
}

.file-remove-btn:hover {
  background-color: rgba(214, 69, 69, 0.1);
}

/* ============================================================
   404 页
   ============================================================ */
.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 80px 20px;
  flex: 1;
}

.error-panel {
  text-align: center;
  max-width: 560px;
}

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

.error-panel h1 {
  font-size: 24px;
  margin-bottom: 12px;
}

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

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

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

/* ============================================================
   响应式 — 桌面端以下
   ============================================================ */
@media (max-width: 1024px) {
  .header-inner {
    gap: 16px;
  }

  .nav-link {
    padding: 8px 10px;
    font-size: 14px;
  }

  .tool-link {
    padding: 8px 12px;
    font-size: 13px;
  }

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

  .service-list-section .service-card {
    grid-template-columns: 220px 1fr;
  }

  .version-note-grid,
  .format-block,
  .precheck-panel {
    grid-template-columns: 260px 1fr;
  }
}

@media (max-width: 768px) {
  .header-inner {
    height: auto;
    min-height: 64px;
    flex-wrap: wrap;
    padding: 12px 16px;
    gap: 12px;
  }

  .brand-link {
    margin-right: auto;
  }

  .brand-name {
    font-size: 19px;
  }

  .main-nav {
    order: 3;
    width: 100%;
    margin-left: 0;
    overflow-x: auto;
  }

  .nav-list {
    gap: 2px;
    padding-bottom: 4px;
    min-width: max-content;
  }

  .nav-link {
    padding: 6px 12px;
    font-size: 14px;
    white-space: nowrap;
  }

  .header-tools {
    gap: 8px;
  }

  .tool-link {
    padding: 6px 10px;
    font-size: 13px;
  }

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

  .hero-content {
    grid-template-columns: 1fr;
    gap: 32px;
  }

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

  .hero-figure {
    order: -1;
  }

  .hero-image {
    aspect-ratio: 16 / 9;
  }

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

  .usage-card-grid {
    grid-template-columns: 1fr;
  }

  .cooperation-section .step-list {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-top {
    grid-template-columns: 1fr;
    gap: 24px;
  }

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

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

  .service-card-media img {
    min-height: 180px;
    aspect-ratio: 16 / 9;
  }

  .service-card-body {
    padding: 20px;
  }

  .version-note-grid,
  .format-block,
  .precheck-panel {
    grid-template-columns: 1fr;
  }

  .version-figure img,
  .format-figure img {
    aspect-ratio: 16 / 9;
  }

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

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

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

  .timeline-list {
    padding-left: 20px;
  }

  .timeline-item {
    grid-template-columns: 20px 1fr;
    gap: 12px;
  }

  .scenario-figure img {
    aspect-ratio: 16 / 9;
  }

  .conclusion-section {
    padding: 24px;
  }

  .related-tasks-grid,
  .task-card-grid,
  .task-cards,
  .related-task-list {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .header-inner {
    padding: 10px 12px;
  }

  .brand-tagline {
    display: none;
  }

  .header-tools {
    display: none;
  }

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

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

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

  .hero-actions .btn-primary,
  .hero-actions .btn-secondary {
    text-align: center;
  }

  .cooperation-section .step-list {
    grid-template-columns: 1fr;
  }

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

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

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

  .section-header h2,
  .section-head h2,
  .section-title {
    font-size: 20px;
  }

  .table-wrapper {
    margin: 0 -4px;
  }

  table th,
  table td {
    padding: 10px 12px;
    font-size: 14px;
  }

  .notice-item {
    padding-left: 56px;
  }

  .notice-item::before {
    left: 16px;
  }

  .scenario-steps .step-item {
    gap: 12px;
    padding: 12px;
  }

  .step-number {
    width: 28px;
    height: 28px;
    font-size: 13px;
  }

  .step-body {
    font-size: 14px;
  }

  .timeline-item {
    grid-template-columns: 20px 1fr;
  }

  .format-code {
    font-size: 12px;
    padding: 12px;
  }

  .code-sample code {
    font-size: 12px;
  }
}