/* ==========================================================================
   base — 全站基础变量、重置与排版
   ========================================================================== */

:root {
  --color-bg: #f7f8fa;
  --color-card: #ffffff;
  --color-text: #1f2937;
  --color-text-secondary: #6b7280;
  --color-primary: #1d3a5f;
  --color-primary-light: #2a4d7a;
  --color-accent: #e07b39;
  --color-accent-dark: #c96a2c;
  --color-info-bg: #e8eef5;
  --color-border: #e5e7eb;
  --color-danger: #c0392b;
  --color-success: #2e7d5b;
  --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", Consolas, monospace;
  --container-width: 1200px;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --shadow-sm: 0 1px 2px rgba(31, 41, 55, 0.06);
  --shadow-md: 0 2px 8px rgba(31, 41, 55, 0.08);
  --transition-base: 0.2s ease;
}

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

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

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

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

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

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

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4 {
  font-weight: 600;
  line-height: 1.5;
  color: var(--color-primary);
}

h1 {
  font-size: 32px;
  line-height: 1.4;
}

h2 {
  font-size: 24px;
  line-height: 1.5;
}

h3 {
  font-size: 18px;
  line-height: 1.5;
}

p {
  margin-bottom: 0;
}

figure {
  margin: 0;
}

dt,
dd {
  margin: 0;
}

.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;
}

/* ==========================================================================
   layout — 全站骨架容器与共享布局
   ========================================================================== */

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

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

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

/* ==========================================================================
   components — 页头导航
   ========================================================================== */

.site-header {
  background-color: var(--color-card);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
  min-height: 64px;
}

.brand {
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
}

.brand-name {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 0;
}

.brand:hover .brand-name {
  color: var(--color-accent);
}

.site-nav {
  display: flex;
  align-items: center;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 8px 10px;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  flex-shrink: 0;
}

.nav-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--color-primary);
  transition: transform var(--transition-base), opacity var(--transition-base);
}

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

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

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

.nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
  margin: 0;
  padding: 0;
}

.nav-list li {
  position: relative;
}

.nav-list a {
  display: block;
  padding: 8px 12px;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text);
  border-radius: var(--radius-sm);
  white-space: nowrap;
}

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

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

.nav-list a.is-current::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 2px;
  height: 2px;
  background-color: var(--color-primary);
  border-radius: 1px;
}

.nav-cta {
  margin-left: 16px;
  flex-shrink: 0;
}

.nav-cta a {
  display: inline-block;
  padding: 9px 20px;
  font-size: 14px;
  font-weight: 600;
  color: #fff;
  background-color: var(--color-accent);
  border-radius: var(--radius-md);
  transition: background-color var(--transition-base);
}

.nav-cta a:hover {
  background-color: var(--color-accent-dark);
  color: #fff;
}

/* ==========================================================================
   components — 页脚
   ========================================================================== */

.site-footer {
  background-color: var(--color-primary);
  color: rgba(255, 255, 255, 0.85);
  padding: 48px 0 32px;
}

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

.footer-brand {
  margin-bottom: 24px;
}

.footer-tagline {
  font-size: 18px;
  font-weight: 600;
  color: #fff;
  margin-bottom: 8px;
}

.footer-brand p:not(.footer-tagline) {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.7);
  max-width: 560px;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  margin-bottom: 24px;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.15);
}

.footer-nav a {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.75);
  padding: 4px 0;
}

.footer-nav a:hover {
  color: #fff;
}

.footer-boundary {
  font-size: 13px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.6);
  padding-top: 16px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  margin-bottom: 16px;
}

.footer-copy {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.5);
}

/* ==========================================================================
   components — 通用元素：按钮、文本链接、标签、折叠
   ========================================================================== */

.btn {
  display: inline-block;
  padding: 12px 24px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background-color var(--transition-base), color var(--transition-base), border-color var(--transition-base);
}

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

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

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

.btn-secondary:hover {
  background-color: var(--color-info-bg);
  color: var(--color-primary);
}

.text-link {
  display: inline-block;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-accent);
}

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

.text-link::after {
  content: " →";
}

.tag {
  display: inline-block;
  padding: 3px 10px;
  font-size: 12px;
  font-weight: 500;
  border-radius: var(--radius-sm);
  white-space: nowrap;
}

.tag-service {
  color: var(--color-primary);
  background-color: var(--color-info-bg);
}

.tag-cooperation {
  color: var(--color-accent-dark);
  background-color: #fdf0e7;
}

.tag-update {
  color: var(--color-success);
  background-color: #e6f2ec;
}

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

details summary {
  cursor: pointer;
  padding: 16px 20px;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  transition: background-color var(--transition-base);
}

details summary::-webkit-details-marker {
  display: none;
}

details summary::after {
  content: "+";
  font-size: 20px;
  font-weight: 400;
  color: var(--color-accent);
  flex-shrink: 0;
  line-height: 1;
}

details[open] summary::after {
  content: "−";
}

details summary:hover {
  background-color: var(--color-info-bg);
}

details[open] summary {
  border-bottom: 1px solid var(--color-border);
}

details > p,
details .announcement-content {
  padding: 16px 20px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-text-secondary);
}

/* ==========================================================================
   components — 面包屑
   ========================================================================== */

.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  padding: 16px 0 8px;
  font-size: 14px;
}

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

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

.breadcrumb-sep {
  color: var(--color-border);
}

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

/* ==========================================================================
   components — 页面标题区
   ========================================================================== */

.page-header {
  padding: 24px 0 32px;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 40px;
}

.page-title {
  font-size: 32px;
  line-height: 1.4;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.page-description {
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-text-secondary);
  max-width: 720px;
}

/* ==========================================================================
   components — 首页：hero
   ========================================================================== */

.hero-section {
  display: grid;
  grid-template-columns: 7fr 5fr;
  gap: 48px;
  align-items: center;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 56px 24px 48px;
}

.hero-copy h1 {
  font-size: 36px;
  line-height: 1.35;
  margin-bottom: 16px;
}

.hero-lead {
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-text-secondary);
  margin-bottom: 28px;
  max-width: 520px;
}

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

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

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

/* ==========================================================================
   components — 首页：业务边界条
   ========================================================================== */

.boundary-strip {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 16px 24px 48px;
}

.section-title {
  font-size: 24px;
  margin-bottom: 24px;
  padding-bottom: 12px;
  position: relative;
}

.section-title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 40px;
  height: 3px;
  background-color: var(--color-accent);
  border-radius: 2px;
}

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

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

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

.boundary-card h3 {
  font-size: 17px;
  margin-bottom: 10px;
  color: var(--color-primary);
}

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

/* ==========================================================================
   components — 首页：服务项目索引
   ========================================================================== */

.services-index {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 16px 24px 48px;
}

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

.service-card {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: box-shadow var(--transition-base);
}

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

.service-card-featured {
  grid-column: span 2;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  align-items: center;
}

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

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

.service-info {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.service-card h3 {
  font-size: 20px;
  color: var(--color-primary);
}

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

.service-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 4px;
}

.service-tags span {
  font-size: 12px;
  padding: 3px 10px;
  background-color: var(--color-info-bg);
  color: var(--color-primary);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
}

/* ==========================================================================
   components — 首页：服务流程预览
   ========================================================================== */

.process-preview {
  background-color: var(--color-card);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  padding: 48px 0;
}

.process-preview .section-title {
  max-width: var(--container-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

.process-steps {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

.step-item {
  position: relative;
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px 16px;
  text-align: left;
}

.step-num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent);
  margin-bottom: 8px;
}

.step-item h3 {
  font-size: 15px;
  margin-bottom: 8px;
  color: var(--color-text);
}

.step-item p {
  font-size: 13px;
  line-height: 1.6;
  color: var(--color-text-secondary);
}

.process-cta {
  max-width: var(--container-width);
  margin: 32px auto 0;
  padding: 0 24px;
  text-align: left;
}

/* ==========================================================================
   components — 首页：双栏模块
   ========================================================================== */

.dual-panel {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 24px;
}

.dual-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.panel-left,
.panel-right {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px;
}

.panel-left h3,
.panel-right h3 {
  font-size: 18px;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
}

.question-preview,
.deliverable-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 24px;
}

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

.question-preview li::before {
  content: "Q";
  position: absolute;
  left: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--color-accent);
}

.deliverable-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  font-size: 14px;
  color: var(--color-success);
  font-weight: 600;
}

/* ==========================================================================
   components — 首页：常见问题提点
   ========================================================================== */

.faq-teaser {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 16px 24px 48px;
}

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 24px;
}

.faq-more {
  font-size: 14px;
}

/* ==========================================================================
   components — 首页：合作横幅
   ========================================================================== */

.cooperation-banner {
  background-color: var(--color-primary);
  padding: 48px 24px;
}

.cooperation-banner .section-title {
  color: #fff;
  max-width: var(--container-width);
  margin-left: auto;
  margin-right: auto;
}

.cooperation-banner .section-title::after {
  background-color: var(--color-accent);
}

.coop-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  max-width: var(--container-width);
  margin: 0 auto 32px;
}

.coop-step {
  background-color: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-md);
  padding: 16px;
  color: rgba(255, 255, 255, 0.9);
}

.coop-step span {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  color: var(--color-accent);
  margin-bottom: 6px;
}

.coop-step p {
  font-size: 14px;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.85);
}

.cooperation-banner .btn-primary {
  display: block;
  width: fit-content;
  margin: 0 auto;
}

/* ==========================================================================
   components — 首页：相关链接区
   ========================================================================== */

.related-links {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 24px 24px 48px;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px 24px;
}

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

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

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

/* ==========================================================================
   pages — 关于平台页
   ========================================================================== */

.platform-overview {
  display: grid;
  grid-template-columns: 3fr 2fr;
  gap: 40px;
  align-items: start;
  margin-bottom: 48px;
}

.overview-copy h2 {
  font-size: 24px;
  margin-bottom: 20px;
}

.overview-copy p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-text-secondary);
  margin-bottom: 16px;
}

.overview-copy p:last-child {
  margin-bottom: 0;
}

.overview-media {
  border-radius: var(--radius-lg);
  overflow: hidden;
  background-color: var(--color-card);
  box-shadow: var(--shadow-sm);
}

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

.overview-media figcaption {
  padding: 12px 16px;
  font-size: 13px;
  color: var(--color-text-secondary);
  background-color: var(--color-card);
  border-top: 1px solid var(--color-border);
}

.boundary-section {
  margin-bottom: 48px;
}

.section-intro {
  font-size: 15px;
  color: var(--color-text-secondary);
  margin-bottom: 24px;
  max-width: 720px;
}

.boundary-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.boundary-list li {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-danger);
  border-radius: var(--radius-md);
  padding: 20px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-secondary);
}

.boundary-list strong {
  display: block;
  font-size: 15px;
  color: var(--color-text);
  margin-bottom: 6px;
}

.work-method {
  margin-bottom: 48px;
}

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

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

.method-item h3 {
  font-size: 16px;
  color: var(--color-primary);
  margin-bottom: 10px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border);
}

.method-item p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-secondary);
}

.next-steps {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-bottom: 48px;
}

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

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

.next-card h2 {
  font-size: 18px;
  margin-bottom: 10px;
}

.next-card p {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: 16px;
}

.next-card a {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent);
}

/* ==========================================================================
   pages — 业务服务页
   ========================================================================== */

.service-overview-media {
  margin-bottom: 48px;
}

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

.overview-figure img {
  width: 100%;
  height: 360px;
  object-fit: cover;
}

.overview-figure figcaption {
  padding: 12px 16px;
  font-size: 13px;
  color: var(--color-text-secondary);
  background-color: var(--color-card);
  border-top: 1px solid var(--color-border);
}

.service-detail-list {
  margin-bottom: 48px;
}

.service-detail-list .service-card {
  margin-bottom: 20px;
  display: block;
}

.service-card-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--color-border);
}

.service-name {
  font-size: 20px;
  color: var(--color-primary);
}

.service-tag {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--color-accent);
  background-color: #fdf0e7;
  padding: 3px 10px;
  border-radius: var(--radius-sm);
}

.service-dimension {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.dimension-row {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 16px;
  padding: 12px 0;
  border-bottom: 1px solid var(--color-border);
}

.dimension-row:last-child {
  border-bottom: none;
}

.dimension-row dt {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  color: var(--color-primary);
  padding-top: 2px;
}

.dimension-row dd {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-secondary);
}

.deliverable-section {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  margin-bottom: 48px;
}

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

.deliverable-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.deliverable-list li {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 16px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-secondary);
}

.next-step-links {
  margin-bottom: 48px;
}

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

.step-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: box-shadow var(--transition-base), border-color var(--transition-base);
}

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

.step-card-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-primary);
}

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

/* ==========================================================================
   pages — 服务选型页
   ========================================================================== */

.selection-guide {
  margin-bottom: 48px;
}

.selection-figure {
  border-radius: var(--radius-lg);
  overflow: hidden;
  background-color: var(--color-card);
  box-shadow: var(--shadow-sm);
  margin-bottom: 32px;
}

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

.selection-figure figcaption {
  padding: 12px 16px;
  font-size: 13px;
  color: var(--color-text-secondary);
  background-color: var(--color-card);
  border-top: 1px solid var(--color-border);
}

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

.question-checklist {
  margin-bottom: 48px;
}

.section-note {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: 24px;
}

.question-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 24px;
}

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

.question-text {
  margin-bottom: 14px;
}

.question-text h3 {
  font-size: 16px;
  color: var(--color-text);
  margin-bottom: 6px;
}

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

.question-options {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.option-item {
  display: inline-block;
  padding: 8px 16px;
  font-size: 14px;
  color: var(--color-text);
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: default;
}

.option-item:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.checklist-result {
  font-size: 14px;
}

.checklist-result a {
  color: var(--color-accent);
  font-weight: 600;
}

.comparison-section {
  margin-bottom: 48px;
}

.comparison-table-wrap {
  overflow-x: auto;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  margin-bottom: 16px;
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 720px;
}

.comparison-table th,
.comparison-table td {
  padding: 14px 16px;
  text-align: left;
  font-size: 14px;
  line-height: 1.7;
  border-bottom: 1px solid var(--color-border);
  vertical-align: top;
}

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

.comparison-table thead th:first-child {
  background-color: var(--color-primary);
}

.comparison-table tbody th {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  color: var(--color-primary);
  background-color: var(--color-bg);
  white-space: nowrap;
  width: 120px;
}

.comparison-table tbody td {
  color: var(--color-text-secondary);
}

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

.comparison-table td.is-compared {
  background-color: #fdf0e7;
  color: var(--color-text);
}

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

.comparison-note a {
  color: var(--color-accent);
  font-weight: 600;
}

.check-steps {
  margin-bottom: 48px;
}

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

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

.step-content h3 {
  font-size: 15px;
  margin-bottom: 8px;
  color: var(--color-text);
}

.step-content p {
  font-size: 13px;
  line-height: 1.6;
  color: var(--color-text-secondary);
}

.intent-compare {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  margin-bottom: 48px;
}

.compare-selector {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 16px;
}

.compare-option {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: border-color var(--transition-base), background-color var(--transition-base);
}

.compare-option:hover {
  border-color: var(--color-accent);
}

.compare-option input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--color-accent);
}

.compare-label {
  font-size: 14px;
  color: var(--color-text);
}

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

/* ==========================================================================
   components — 步骤导航（选型 / 资料 / 合作）
   ========================================================================== */

.step-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin: 48px 0;
}

.step-nav-item,
.step-link {
  display: block;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.step-nav-item:hover,
.step-link:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-md);
}

.step-direction {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--color-accent);
  margin-bottom: 6px;
}

.step-target,
.step-title {
  display: block;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-primary);
}

.step-nav-item.step-next,
.step-link.step-next {
  text-align: right;
}

/* ==========================================================================
   pages — 服务公告页
   ========================================================================== */

.announce-categories {
  margin-bottom: 40px;
}

.category-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 12px;
}

.category-desc {
  font-size: 14px;
  color: var(--color-text-secondary);
}

.latest-announcement {
  margin-bottom: 48px;
}

.announcement-card {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-accent);
  border-radius: var(--radius-md);
  padding: 28px;
}

.announcement-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  margin-bottom: 12px;
}

.version-tag {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--color-text-secondary);
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  padding: 3px 10px;
  border-radius: var(--radius-sm);
}

.announcement-title {
  font-size: 20px;
  margin-bottom: 12px;
}

.announcement-excerpt {
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-text-secondary);
  margin-bottom: 16px;
}

.announcement-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent);
}

.history-announcements {
  margin-bottom: 48px;
}

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

.announcement-item summary {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.summary-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
  flex: 1;
  min-width: 200px;
}

.announcement-content p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--color-text-secondary);
}

.announcement-guide {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  margin-bottom: 48px;
}

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

.announcement-guide a {
  color: var(--color-accent);
  font-weight: 600;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 48px;
}

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

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

.related-card h3 {
  font-size: 15px;
  margin-bottom: 8px;
}

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

.announcement-figure {
  border-radius: var(--radius-lg);
  overflow: hidden;
  background-color: var(--color-card);
  box-shadow: var(--shadow-sm);
  margin-bottom: 48px;
}

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

.announcement-figure figcaption {
  padding: 12px 16px;
  font-size: 13px;
  color: var(--color-text-secondary);
  background-color: var(--color-card);
  border-top: 1px solid var(--color-border);
}

/* ==========================================================================
   pages — 服务资料页
   ========================================================================== */

.section-block {
  margin-bottom: 48px;
}

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

.section-head h2 {
  font-size: 24px;
  margin-bottom: 8px;
}

.section-head p {
  font-size: 14px;
  color: var(--color-text-secondary);
}

.standard-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

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

.standard-item h3 {
  font-size: 16px;
  color: var(--color-primary);
  margin-bottom: 10px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border);
}

.standard-item p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-secondary);
}

.glossary-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

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

.glossary-item dt {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.glossary-item dd {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-secondary);
}

.boundary-list .boundary-item {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-danger);
  border-radius: var(--radius-md);
  padding: 20px;
}

.boundary-item h3 {
  font-size: 15px;
  color: var(--color-text);
  margin-bottom: 8px;
}

.boundary-item p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-secondary);
}

.materials-figure {
  border-radius: var(--radius-lg);
  overflow: hidden;
  background-color: var(--color-card);
  box-shadow: var(--shadow-sm);
  margin-bottom: 48px;
}

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

.materials-figure figcaption {
  padding: 12px 16px;
  font-size: 13px;
  color: var(--color-text-secondary);
  background-color: var(--color-card);
  border-top: 1px solid var(--color-border);
}

/* ==========================================================================
   pages — 合作申请页
   ========================================================================== */

.cooperation-flow {
  margin-bottom: 48px;
}

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

.section-heading h2 {
  font-size: 24px;
  margin-bottom: 8px;
}

.section-heading p {
  font-size: 14px;
  color: var(--color-text-secondary);
}

.flow-steps {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

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

.flow-step .step-num {
  font-size: 14px;
  margin-bottom: 10px;
}

.flow-step h3 {
  font-size: 17px;
  margin-bottom: 10px;
}

.flow-step p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-secondary);
  margin-bottom: 8px;
}

.flow-step p a {
  color: var(--color-accent);
  font-weight: 600;
}

.step-output {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-success);
  background-color: #e6f2ec;
  border-radius: var(--radius-sm);
  padding: 6px 12px;
  display: inline-block;
}

.material-checklist {
  margin-bottom: 48px;
}

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

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

.checklist-item h3 {
  font-size: 15px;
  color: var(--color-primary);
  margin-bottom: 10px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border);
}

.checklist-item p {
  font-size: 13px;
  line-height: 1.7;
  color: var(--color-text-secondary);
}

.feedback-note {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  margin-bottom: 48px;
}

.feedback-content p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--color-text-secondary);
  margin-bottom: 12px;
}

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

.cooperation-figure {
  border-radius: var(--radius-lg);
  overflow: hidden;
  background-color: var(--color-card);
  box-shadow: var(--shadow-sm);
  margin-bottom: 48px;
}

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

.cooperation-figure figcaption {
  padding: 12px 16px;
  font-size: 13px;
  color: var(--color-text-secondary);
  background-color: var(--color-card);
  border-top: 1px solid var(--color-border);
}

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

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

.error-panel {
  max-width: 560px;
  text-align: center;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 48px 40px;
}

.error-code {
  font-family: var(--font-mono);
  font-size: 72px;
  font-weight: 700;
  color: var(--color-accent);
  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: 28px;
}

.error-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  margin-bottom: 20px;
}

.action-primary {
  display: inline-block;
  padding: 12px 24px;
  font-size: 14px;
  font-weight: 600;
  color: #fff;
  background-color: var(--color-accent);
  border-radius: var(--radius-md);
}

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

.action-secondary {
  display: inline-block;
  padding: 12px 24px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
  background-color: var(--color-card);
  border: 1px solid var(--color-primary);
  border-radius: var(--radius-md);
}

.action-secondary:hover {
  background-color: var(--color-info-bg);
}

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

/* ==========================================================================
   responsive — 1024px
   ========================================================================== */

@media (max-width: 1024px) {
  .hero-section {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }

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

  .service-card-featured {
    grid-column: span 2;
  }

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

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

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

  .platform-overview {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .overview-media img {
    height: 320px;
  }

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

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

/* ==========================================================================
   responsive — 768px
   ========================================================================== */

@media (max-width: 768px) {
  .header-inner {
    padding: 0 16px;
    min-height: 56px;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: static;
  }

  .nav-list {
    display: none;
    position: absolute;
    top: 56px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    background-color: var(--color-card);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
    padding: 8px 16px;
    gap: 0;
    z-index: 99;
    max-height: calc(100vh - 56px);
    overflow-y: auto;
  }

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

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

  .nav-list a {
    padding: 12px 8px;
    border-bottom: 1px solid var(--color-border);
    border-radius: 0;
    white-space: normal;
  }

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

  .nav-cta {
    margin-left: 12px;
  }

  .nav-cta a {
    padding: 8px 14px;
    font-size: 13px;
  }

  .hero-section {
    grid-template-columns: 1fr;
    padding: 32px 16px 32px;
    gap: 24px;
  }

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

  .hero-media img {
    height: 260px;
  }

  .boundary-strip,
  .services-index,
  .dual-panel,
  .faq-teaser {
    padding-left: 16px;
    padding-right: 16px;
  }

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

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

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

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

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

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

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

  .site-main.inner-main {
    padding: 0 16px 48px;
  }

  .page-header {
    padding: 20px 0 24px;
    margin-bottom: 32px;
  }

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

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

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

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

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

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

  .dimension-row {
    grid-template-columns: 100px 1fr;
  }

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

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

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

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

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

  .step-nav-item.step-next,
  .step-link.step-next {
    text-align: left;
  }

  .footer-inner {
    padding: 0 16px;
  }

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

/* ==========================================================================
   responsive — 560px
   ========================================================================== */

@media (max-width: 560px) {
  .brand-name {
    font-size: 18px;
  }

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

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

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

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

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

  .service-card h3 {
    font-size: 18px;
  }

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

  .comparison-table-wrap {
    margin: 0 -16px 16px;
    border-radius: 0;
    border-left: none;
    border-right: none;
  }

  .comparison-table {
    min-width: 600px;
  }

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

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

  .coop-step {
    padding: 14px;
  }

  .cooperation-banner {
    padding: 32px 16px;
  }

  .error-panel {
    padding: 32px 20px;
  }

  .error-code {
    font-size: 56px;
  }

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

  .error-actions a {
    text-align: center;
  }

  .footer-tagline {
    font-size: 16px;
  }

  .footer-brand p:not(.footer-tagline) {
    font-size: 13px;
  }

  .footer-nav {
    flex-direction: column;
    gap: 4px 0;
  }

  .footer-nav a {
    padding: 6px 0;
  }
}