/* ============================================================
   51大赛 · 全局基础样式
   ============================================================ */
:root {
  --color-bg: #f8f5ef;
  --color-text: #1f2933;
  --color-accent: #a3763f;
  --color-line: #e5e0d6;
  --color-primary: #237a76;
  --color-white: #ffffff;
  --font-family: "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --container-width: 1200px;
  --container-padding: 0 16px;
  --radius: 8px;
  --transition: 0.2s ease;
}

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

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

body {
  font-family: var(--font-family);
  font-size: 16px;
  line-height: 1.75;
  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;
}

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

ul,
ol {
  list-style: none;
}

svg {
  display: block;
}

/* ============================================================
   全站骨架：页头 / 页脚 / 主容器
   ============================================================ */
.site-header {
  background-color: var(--color-white);
  border-bottom: 1px solid var(--color-line);
  position: sticky;
  top: 0;
  z-index: 100;
}

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

.brand-logo {
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-shrink: 0;
}

.brand-name {
  font-size: 26px;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: 0.5px;
}

.brand-tagline {
  font-size: 13px;
  color: #6b7280;
  white-space: nowrap;
}

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

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 8px;
  background: none;
  border: none;
  cursor: pointer;
}

.nav-toggle-bar {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-text);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

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

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

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

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

.nav-list li {
  margin: 0;
}

.nav-link {
  display: inline-block;
  padding: 8px 14px;
  font-size: 15px;
  color: var(--color-text);
  border-radius: 4px;
  transition: background-color var(--transition), color var(--transition);
  position: relative;
}

.nav-link:hover {
  color: var(--color-primary);
  background-color: rgba(35, 122, 118, 0.06);
}

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

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

.site-main {
  min-height: 60vh;
}

/* 首页主容器 */
.home-main .hero-section,
.home-main .capability-strip,
.home-main .qa-layout-section,
.home-main .scenarios-section,
.home-main .cooperation-section,
.home-main .feature-preview,
.home-main .cta-gateway {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: var(--container-padding);
}

/* 内页主容器 */
.inner-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: var(--container-padding);
}

/* ============================================================
   页脚
   ============================================================ */
.site-footer {
  background-color: #2a2e33;
  color: #cfd4d9;
  margin-top: 64px;
}

.footer-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 16px 24px;
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 32px;
}

.footer-brand {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 8px;
}

.footer-desc {
  font-size: 14px;
  line-height: 1.7;
  color: #9aa3ab;
}

.footer-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-white);
  margin-bottom: 12px;
}

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

.footer-links a {
  font-size: 14px;
  color: #9aa3ab;
  transition: color var(--transition);
}

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

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 16px;
  font-size: 13px;
  color: #7a838b;
  text-align: center;
}

/* ============================================================
   通用组件：按钮 / 面包屑 / 页面标题 / 区块标题
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 24px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius);
  transition: background-color var(--transition), border-color var(--transition), color var(--transition);
}

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

.btn-primary:hover {
  background-color: #1b6562;
  border-color: #1b6562;
  color: var(--color-white);
}

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

.btn-secondary:hover {
  background-color: rgba(35, 122, 118, 0.08);
  color: var(--color-primary);
}

.breadcrumb {
  padding: 24px 0 8px;
  font-size: 14px;
  color: #6b7280;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
}

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

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

.breadcrumb-sep {
  color: #9aa3ab;
  margin: 0 2px;
}

.breadcrumb-current {
  color: #6b7280;
}

.page-header {
  padding: 16px 0 32px;
  border-bottom: 1px solid var(--color-line);
  margin-bottom: 40px;
}

.page-title {
  font-size: 34px;
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-text);
  margin-bottom: 8px;
}

.page-description {
  font-size: 16px;
  color: #4b5563;
  max-width: 720px;
}

.section-title {
  font-size: 26px;
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.4;
}

.section-desc {
  font-size: 15px;
  color: #4b5563;
  margin-top: 6px;
}

.section-header {
  margin-bottom: 28px;
}

/* ============================================================
   首页 · Hero
   ============================================================ */
.hero-section {
  position: relative;
  padding: 0 16px;
}

.hero-media {
  position: absolute;
  inset: 0;
  overflow: hidden;
  border-radius: var(--radius);
}

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

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 640px;
  padding: 72px 0;
}

.hero-title {
  font-size: 40px;
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-text);
  margin-bottom: 16px;
}

.hero-lead {
  font-size: 17px;
  line-height: 1.8;
  color: #374151;
  margin-bottom: 24px;
}

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

/* ============================================================
   首页 · 核心能力摘要
   ============================================================ */
.capability-strip {
  padding-top: 48px;
  padding-bottom: 24px;
}

.capability-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.capability-item {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 24px 20px;
  transition: box-shadow var(--transition), border-color var(--transition);
}

.capability-item:hover {
  border-color: var(--color-primary);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
}

.capability-icon {
  width: 40px;
  height: 40px;
  margin-bottom: 12px;
  color: var(--color-primary);
}

.capability-icon svg {
  width: 100%;
  height: 100%;
}

.capability-name {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--color-text);
}

.capability-text {
  font-size: 14px;
  line-height: 1.7;
  color: #4b5563;
}

/* ============================================================
   首页 · 客户关注问题 + 侧栏
   ============================================================ */
.qa-layout-section {
  padding-top: 24px;
  padding-bottom: 24px;
}

.qa-layout {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 32px;
  align-items: start;
}

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

.qa-item {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  overflow: hidden;
}

.qa-item[open] {
  border-color: var(--color-primary);
}

.qa-question {
  padding: 16px 20px;
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

.qa-question::-webkit-details-marker {
  display: none;
}

.qa-question::after {
  content: "+";
  font-size: 20px;
  font-weight: 400;
  color: var(--color-primary);
  flex-shrink: 0;
  transition: transform var(--transition);
}

.qa-item[open] .qa-question::after {
  content: "−";
}

.qa-answer {
  padding: 0 20px 16px;
  font-size: 15px;
  line-height: 1.75;
  color: #4b5563;
}

.qa-sidebar {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.sidebar-block {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 20px;
}

.sidebar-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-line);
}

.sidebar-links {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.sidebar-links li {
  margin: 0;
}

.sidebar-link {
  display: block;
  padding: 8px 10px;
  font-size: 15px;
  color: var(--color-text);
  border-radius: 4px;
  transition: background-color var(--transition), color var(--transition);
}

.sidebar-link:hover {
  background-color: rgba(35, 122, 118, 0.06);
  color: var(--color-primary);
}

.sidebar-link-more {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  margin-top: 8px;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-primary);
}

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

/* ============================================================
   首页 · 服务场景摘要
   ============================================================ */
.scenarios-section {
  padding-top: 24px;
  padding-bottom: 24px;
}

.scenario-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.scenario-card {
  display: block;
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 24px 20px;
  transition: box-shadow var(--transition), border-color var(--transition);
}

.scenario-card:hover {
  border-color: var(--color-primary);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
}

.scenario-icon {
  width: 36px;
  height: 36px;
  margin-bottom: 12px;
  color: var(--color-accent);
}

.scenario-icon svg {
  width: 100%;
  height: 100%;
}

.scenario-name {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--color-text);
}

.scenario-text {
  font-size: 14px;
  line-height: 1.7;
  color: #4b5563;
}

/* ============================================================
   首页 · 合作流程
   ============================================================ */
.cooperation-section {
  padding-top: 24px;
  padding-bottom: 24px;
}

.cooperation-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 28px;
}

.cooperation-step {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 24px 20px;
  position: relative;
}

.cooperation-step .step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background-color: var(--color-primary);
  color: var(--color-white);
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 12px;
}

.cooperation-step .step-title {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--color-text);
}

.cooperation-step .step-text {
  font-size: 14px;
  line-height: 1.7;
  color: #4b5563;
}

.cooperation-cta {
  text-align: center;
}

/* ============================================================
   首页 · 功能预览
   ============================================================ */
.feature-preview {
  padding-top: 24px;
  padding-bottom: 24px;
}

.preview-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}

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

.preview-figure {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--color-line);
  background-color: var(--color-white);
}

.preview-figure img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.preview-figure figcaption {
  padding: 10px 16px;
  font-size: 13px;
  color: #6b7280;
  border-top: 1px solid var(--color-line);
}

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

.concept-item {
  border-left: 3px solid var(--color-primary);
  padding-left: 16px;
}

.concept-title {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 4px;
}

.concept-text {
  font-size: 15px;
  line-height: 1.75;
  color: #4b5563;
}

/* ============================================================
   首页 · 下一步入口
   ============================================================ */
.cta-gateway {
  padding-top: 24px;
  padding-bottom: 48px;
}

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

.gateway-card {
  display: block;
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 28px 24px;
  transition: box-shadow var(--transition), border-color var(--transition);
}

.gateway-card:hover {
  border-color: var(--color-primary);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
}

.gateway-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 8px;
}

.gateway-text {
  font-size: 14px;
  line-height: 1.7;
  color: #4b5563;
  margin-bottom: 12px;
}

.gateway-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-primary);
}

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

/* ============================================================
   内页 · 功能概览
   ============================================================ */
.feature-matrix {
  margin-bottom: 48px;
}

.matrix-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 20px;
}

.matrix-item {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 24px;
  transition: border-color var(--transition);
}

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

.matrix-item-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 8px;
}

.matrix-item-desc {
  font-size: 15px;
  line-height: 1.75;
  color: #4b5563;
  margin-bottom: 10px;
}

.matrix-tag {
  display: inline-block;
  padding: 4px 12px;
  font-size: 13px;
  color: var(--color-primary);
  background-color: rgba(35, 122, 118, 0.08);
  border-radius: 20px;
}

.matrix-media {
  margin-top: 20px;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--color-line);
  background-color: var(--color-white);
}

.matrix-media .media-image {
  width: 100%;
  aspect-ratio: 21 / 9;
  object-fit: cover;
}

.matrix-media figcaption {
  padding: 10px 16px;
  font-size: 13px;
  color: #6b7280;
  border-top: 1px solid var(--color-line);
}

.feature-detail {
  margin-bottom: 40px;
}

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

.detail-col {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 24px;
}

.detail-col-title {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-line);
}

.detail-list li {
  padding: 8px 0;
  font-size: 15px;
  color: #4b5563;
  border-bottom: 1px solid #f0ece4;
  line-height: 1.6;
}

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

/* ============================================================
   内页 · 相关入口（通用）
   ============================================================ */
.related-links {
  margin: 48px 0;
  padding-top: 32px;
  border-top: 1px solid var(--color-line);
}

.related-title,
.related-links .section-title {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 20px;
}

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

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

.related-card:hover {
  border-color: var(--color-primary);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
}

.related-card-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 6px;
}

.related-card-desc {
  font-size: 14px;
  line-height: 1.7;
  color: #4b5563;
}

/* 操作指南页与页脚相关入口 */
.related-links ul {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.related-links ul li a {
  display: block;
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 20px;
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.related-links ul li a:hover {
  border-color: var(--color-primary);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
  color: var(--color-primary);
}

/* 合作咨询页与版本页相关入口 */
.related-link-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.related-link {
  display: block;
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 20px;
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.related-link:hover {
  border-color: var(--color-primary);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
  color: var(--color-primary);
}

/* ============================================================
   内页 · 使用场景
   ============================================================ */
.scenario-blocks {
  margin-bottom: 40px;
}

.scenario-item {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 16px;
}

.scenario-item:last-child {
  margin-bottom: 0;
}

.scenario-name {
  font-size: 19px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 12px;
}

.scenario-content p {
  font-size: 15px;
  line-height: 1.75;
  color: #4b5563;
  margin-bottom: 6px;
}

.scenario-content p strong {
  color: var(--color-text);
  font-weight: 600;
  margin-right: 4px;
}

.scene-image-block {
  margin: 40px 0;
}

.scene-figure {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--color-line);
  background-color: var(--color-white);
}

.scene-image {
  width: 100%;
  aspect-ratio: 21 / 9;
  object-fit: cover;
}

.scene-caption {
  padding: 10px 16px;
  font-size: 13px;
  color: #6b7280;
  border-top: 1px solid var(--color-line);
}

/* ============================================================
   内页 · 版本说明
   ============================================================ */
.page-layout {
  display: flex;
  flex-direction: column;
  gap: 48px;
}

.version-card-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.version-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 28px 24px;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.version-card:hover {
  border-color: var(--color-primary);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
}

.version-name {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 6px;
}

.version-target {
  font-size: 14px;
  color: var(--color-accent);
  margin-bottom: 16px;
}

.version-points li {
  padding: 6px 0;
  font-size: 15px;
  color: #4b5563;
  line-height: 1.6;
  padding-left: 16px;
  position: relative;
}

.version-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 14px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--color-primary);
}

.version-figure {
  margin-bottom: 20px;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--color-line);
  background-color: var(--color-white);
}

.version-figure img {
  width: 100%;
  aspect-ratio: 21 / 8;
  object-fit: cover;
}

.version-figure figcaption {
  padding: 10px 16px;
  font-size: 13px;
  color: #6b7280;
  border-top: 1px solid var(--color-line);
}

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

.version-table {
  width: 100%;
  border-collapse: collapse;
  background-color: var(--color-white);
  border-radius: var(--radius);
  overflow: hidden;
  font-size: 14px;
}

.version-table thead th {
  background-color: #2a2e33;
  color: var(--color-white);
  padding: 14px 16px;
  text-align: left;
  font-weight: 600;
  white-space: nowrap;
}

.version-table tbody td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-line);
  color: #4b5563;
}

.version-table tbody tr:last-child td {
  border-bottom: none;
}

.version-table tbody tr:hover {
  background-color: rgba(35, 122, 118, 0.04);
}

.update-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.update-list li {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 20px 24px;
}

.update-list h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 4px;
}

.update-list p {
  font-size: 14px;
  line-height: 1.7;
  color: #4b5563;
}

/* ============================================================
   内页 · 操作指南
   ============================================================ */
.task-steps {
  margin-bottom: 40px;
}

.steps-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.step-item {
  display: flex;
  gap: 20px;
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 24px;
}

.step-item .step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background-color: var(--color-primary);
  color: var(--color-white);
  font-size: 16px;
  font-weight: 600;
  flex-shrink: 0;
}

.step-content h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 6px;
}

.step-content p {
  font-size: 15px;
  line-height: 1.75;
  color: #4b5563;
  margin-bottom: 4px;
}

.operation-figure {
  margin: 40px 0;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--color-line);
  background-color: var(--color-white);
}

.operation-figure img {
  width: 100%;
  aspect-ratio: 21 / 9;
  object-fit: cover;
}

.operation-figure figcaption {
  padding: 10px 16px;
  font-size: 13px;
  color: #6b7280;
  border-top: 1px solid var(--color-line);
}

.tips-section {
  margin: 40px 0;
}

.tips-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.tips-list li {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-left: 3px solid var(--color-accent);
  border-radius: var(--radius);
  padding: 16px 20px;
  font-size: 15px;
  line-height: 1.7;
  color: #4b5563;
}

/* ============================================================
   内页 · 技术支持
   ============================================================ */
.faq-accordion {
  margin-bottom: 40px;
}

.faq-group {
  margin-bottom: 28px;
}

.faq-group-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-primary);
}

.faq-group .faq-item {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  margin-bottom: 10px;
  overflow: hidden;
}

.faq-group .faq-item[open] {
  border-color: var(--color-primary);
}

.faq-group .faq-item summary {
  padding: 14px 20px;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

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

.faq-group .faq-item summary::after {
  content: "+";
  font-size: 20px;
  color: var(--color-primary);
  flex-shrink: 0;
}

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

.faq-group .faq-item p {
  padding: 0 20px 14px;
  font-size: 15px;
  line-height: 1.75;
  color: #4b5563;
}

.support-image-block {
  margin: 40px 0;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--color-line);
  background-color: var(--color-white);
}

.support-image {
  width: 100%;
  aspect-ratio: 21 / 9;
  object-fit: cover;
}

.support-image-block figcaption {
  padding: 10px 16px;
  font-size: 13px;
  color: #6b7280;
  border-top: 1px solid var(--color-line);
}

.support-paths {
  margin: 40px 0;
}

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

.support-path-item {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 20px;
  transition: border-color var(--transition);
}

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

.support-path-item a {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-primary);
  display: block;
  margin-bottom: 4px;
}

.support-path-item span {
  font-size: 14px;
  line-height: 1.7;
  color: #4b5563;
}

/* ============================================================
   内页 · 合作咨询
   ============================================================ */
.section-block {
  margin-bottom: 48px;
}

.section-lead {
  font-size: 15px;
  color: #4b5563;
  margin-bottom: 20px;
  max-width: 720px;
}

.process-steps {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
}

.process-step {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 20px;
  position: relative;
}

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

.process-step h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 4px;
}

.process-step p {
  font-size: 13px;
  line-height: 1.6;
  color: #4b5563;
}

.checklist-items {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.checklist-item {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 20px;
  border-left: 3px solid var(--color-primary);
}

.checklist-item h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 4px;
}

.checklist-item p {
  font-size: 14px;
  line-height: 1.7;
  color: #4b5563;
}

.cooperation-figure {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--color-line);
  background-color: var(--color-white);
}

.cooperation-figure .figure-image {
  width: 100%;
  aspect-ratio: 21 / 8;
  object-fit: cover;
}

.cooperation-figure figcaption {
  padding: 10px 16px;
  font-size: 13px;
  color: #6b7280;
  border-top: 1px solid var(--color-line);
}

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

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

.cooperation-faq .faq-item[open] {
  border-color: var(--color-primary);
}

.cooperation-faq .faq-item summary {
  padding: 16px 20px;
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

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

.cooperation-faq .faq-item summary::after {
  content: "+";
  font-size: 20px;
  color: var(--color-primary);
  flex-shrink: 0;
}

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

.cooperation-faq .faq-item p {
  padding: 0 20px 16px;
  font-size: 15px;
  line-height: 1.75;
  color: #4b5563;
}

/* 合作咨询页相关入口 */
.related-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.related-list li a {
  display: block;
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 20px;
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.related-list li a:hover {
  border-color: var(--color-primary);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
  color: var(--color-primary);
}

/* ============================================================
   404 页面
   ============================================================ */
.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  padding: 48px 16px;
}

.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-title {
  font-size: 24px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 12px;
}

.error-desc {
  font-size: 16px;
  color: #4b5563;
  margin-bottom: 24px;
}

.error-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 28px;
  background-color: var(--color-primary);
  color: var(--color-white);
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 600;
  transition: background-color var(--transition);
}

.error-link:hover {
  background-color: #1b6562;
  color: var(--color-white);
}

/* ============================================================
   滚动渐入动画（不影响初始可见性）
   ============================================================ */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 仅当元素可见时应用动画，初始状态由内容本身决定 */
.hero-section .hero-content {
  animation: fadeInUp 0.5s ease-out both;
}

/* ============================================================
   响应式 · 平板与手机
   ============================================================ */
@media (max-width: 1024px) {
  .capability-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

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

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

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

@media (max-width: 768px) {
  /* 页头与移动导航 */
  .header-inner {
    min-height: 60px;
    flex-wrap: wrap;
  }

  .brand-tagline {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-list {
    display: none;
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    background-color: var(--color-white);
    border-bottom: 1px solid var(--color-line);
    padding: 8px 16px 16px;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.08);
  }

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

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

  .nav-link {
    display: block;
    padding: 12px 8px;
    font-size: 16px;
    border-bottom: 1px solid #f0ece4;
    border-radius: 0;
  }

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

  .nav-link.is-current {
    color: var(--color-primary);
    font-weight: 600;
    background-color: rgba(35, 122, 118, 0.06);
  }

  /* 页脚 */
  .footer-inner {
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    padding: 40px 16px 20px;
  }

  .footer-about {
    grid-column: 1 / -1;
  }

  /* 首页 */
  .hero-content {
    padding: 48px 0;
  }

  .hero-title {
    font-size: 32px;
  }

  .qa-layout {
    grid-template-columns: 1fr;
  }

  .qa-sidebar {
    order: 2;
  }

  .preview-layout {
    grid-template-columns: 1fr;
    gap: 24px;
  }

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

  /* 内页 */
  .page-title {
    font-size: 28px;
  }

  .matrix-row {
    grid-template-columns: 1fr;
  }

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

  .related-grid,
  .related-link-list,
  .related-links ul,
  .related-list,
  .support-path-list {
    grid-template-columns: 1fr;
  }

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

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

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

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

  .step-item {
    flex-direction: column;
    gap: 12px;
  }
}

@media (max-width: 480px) {
  .capability-grid {
    grid-template-columns: 1fr;
  }

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

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

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

  .page-header {
    margin-bottom: 28px;
  }

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

  .hero-title {
    font-size: 28px;
  }

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

  .btn {
    width: 100%;
  }

  .hero-actions {
    flex-direction: column;
  }
}