/**
 * 达运智航官网 —— 公开站样式（移动优先，纯 CSS 响应式）
 * 断点：≤768px 手机 / 769–1024px 平板 / ≥1025px 桌面（最大宽度 1200px 居中）
 */

/* ---------- 基础 ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  margin: 0;
  padding: 0;
  overflow-x: hidden;
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--brand-font-family);
  font-size: 15px;
  line-height: 1.7;
  background-color: var(--brand-canvas);
  color: var(--brand-text);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img,
video {
  max-width: 100%;
}

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

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

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.text-muted { color: var(--brand-text-muted); }
.text-secondary { color: var(--brand-text-secondary); }

/* ---------- Logo（和平鸽 SVG 标志） ---------- */
.logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--brand-text);
  font-weight: 600;
}

.logo-mark {
  display: block;
  height: 36px;
  width: auto;
  flex: none;
}

.logo-text {
  font-size: 18px;
  color: var(--brand-text);
}

.logo-product {
  font-size: 12px;
  color: var(--brand-primary);
  background: var(--brand-primary-tint);
  border-radius: 20px;
  padding: 2px 10px;
  white-space: nowrap;
}

/* ---------- 顶部导航 ---------- */
.site-header,
.admin-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--brand-surface);
  border-bottom: 1px solid var(--brand-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
  gap: 16px;
}

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

.nav-toggle span {
  display: block;
  height: 2px;
  background: var(--brand-text);
  border-radius: 2px;
}

.site-nav {
  display: none;
  position: absolute;
  top: 64px;
  left: 0;
  right: 0;
  flex-direction: column;
  background: var(--brand-surface);
  border-bottom: 1px solid var(--brand-border);
  padding: 8px 20px 16px;
}

.site-nav.open {
  display: flex;
}

.site-nav a {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 8px 4px;
  color: var(--brand-text-secondary);
  border-bottom: 1px solid var(--brand-border);
}

.site-nav a:last-child {
  border-bottom: none;
}

.site-nav a:hover,
.site-nav a.active {
  color: var(--brand-primary);
}

.btn-nav {
  margin-top: 8px;
  justify-content: center;
}

/* 导航中的主按钮：盖过 .site-nav a 的链接色，保持白字 */
.site-nav a.btn-primary,
.site-nav a.btn-primary:hover {
  color: #ffffff;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 8px 20px;
  border-radius: var(--brand-radius-sm);
  border: 1px solid var(--brand-border-strong);
  background: var(--brand-surface);
  color: var(--brand-text);
  font-size: 15px;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease;
}

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

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

.btn-primary:disabled,
.btn-primary[disabled] {
  background: var(--brand-text-muted);
  border-color: var(--brand-text-muted);
  color: #ffffff;
  cursor: not-allowed;
}

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

.btn-outline:hover {
  background: var(--brand-primary-tint);
  color: var(--brand-primary-hover);
}

.btn-lg {
  padding: 12px 28px;
  font-size: 16px;
}

.btn-block {
  width: 100%;
}

/* ---------- Hero ---------- */
.hero {
  background: linear-gradient(180deg, var(--brand-primary-tint) 0%, var(--brand-canvas) 100%);
  padding: 56px 0 48px;
}

.hero-inner {
  text-align: center;
}

.hero-tag {
  display: inline-block;
  margin: 0 0 16px;
  padding: 4px 14px;
  border-radius: 20px;
  background: var(--brand-surface);
  border: 1px solid var(--brand-border);
  color: var(--brand-primary);
  font-size: 13px;
}

.hero h1 {
  margin: 0 0 16px;
  font-size: 32px;
  line-height: 1.3;
  font-weight: 700;
}

.hero-sub {
  margin: 0 auto 28px;
  max-width: 640px;
  color: var(--brand-text-secondary);
  font-size: 16px;
}

.hero-sub strong {
  color: var(--brand-primary);
}

.hero-actions {
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-items: center;
}

.hero-stats {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 40px;
}

.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.stat-num {
  font-size: 28px;
  font-weight: 700;
  color: var(--brand-primary);
  line-height: 1.2;
}

.stat-label {
  font-size: 13px;
  color: var(--brand-text-secondary);
}

/* ---------- 区块 ---------- */
.section {
  padding: 48px 0;
}

.section-tint {
  background: var(--brand-primary-tint);
}

.section-heading {
  margin: 0 0 8px;
  font-size: 24px;
  font-weight: 600;
  text-align: center;
}

.section-desc {
  margin: 0 0 28px;
  text-align: center;
  color: var(--brand-text-secondary);
}

.section-cta {
  background: var(--brand-primary);
  color: #ffffff;
}

.section-cta h2 {
  margin: 0 0 8px;
  font-size: 24px;
}

.section-cta p {
  margin: 0 0 20px;
  color: var(--brand-primary-tint);
}

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

.section-cta .btn-outline {
  border-color: #ffffff;
  color: #ffffff;
}

.section-cta .btn-outline:hover {
  background: rgba(255, 255, 255, 0.15);
  color: #ffffff;
}

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

/* 内页页头 */
.page-hero {
  background: var(--brand-primary-tint);
  padding: 40px 0;
  text-align: center;
}

.page-hero h1 {
  margin: 0 0 8px;
  font-size: 28px;
}

.page-hero p {
  margin: 0;
  color: var(--brand-text-secondary);
}

/* ---------- 卡片 ---------- */
.card {
  background: var(--brand-surface);
  border: 1px solid var(--brand-border);
  border-radius: var(--brand-radius-lg);
  box-shadow: none;
  padding: 20px;
}

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

.card h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 600;
}

.card p {
  margin: 0;
  color: var(--brand-text-secondary);
  font-size: 14px;
}

.card-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--brand-radius-lg);
  background: var(--brand-primary-tint);
  color: var(--brand-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 10px;
}

.card-icon svg {
  width: 24px;
  height: 24px;
}

.contact-card .card-icon {
  margin: 0 auto 10px;
}

/* ---------- 三端协同流程 ---------- */
.flow-grid {
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-items: stretch;
}

.flow-node {
  background: var(--brand-surface);
  border: 1px solid var(--brand-border);
  border-radius: var(--brand-radius-lg);
  padding: 20px;
  flex: 1;
}

.flow-node h3 {
  margin: 0 0 8px;
  font-size: 16px;
}

.flow-node p {
  margin: 0;
  font-size: 14px;
  color: var(--brand-text-secondary);
}

.flow-arrow {
  align-self: center;
  color: var(--brand-primary);
  font-size: 20px;
  transform: rotate(90deg);
}

/* ---------- 双栏 ---------- */
.two-col {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.check-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.check-list li {
  position: relative;
  padding: 6px 0 6px 26px;
  color: var(--brand-text-secondary);
  font-size: 14px;
}

.check-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--brand-primary);
  font-weight: 700;
}

/* ---------- 下载页 ---------- */
.download-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.download-card {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.dl-icon {
  width: 64px;
  height: 64px;
  border-radius: var(--brand-radius-lg);
  background: var(--brand-primary-tint);
  color: var(--brand-primary);
  display: flex;
  align-items: center;
  justify-content: center;
}

.dl-icon svg {
  width: 32px;
  height: 32px;
}

.dl-file {
  font-size: 13px;
}

.dl-meta {
  font-size: 13px;
}

.dl-guide {
  font-size: 13px;
}

.qrcode-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 160px;
  height: 160px;
  border: 1px dashed var(--brand-border-strong);
  border-radius: var(--brand-radius-sm);
  background: var(--brand-canvas);
  color: var(--brand-text-muted);
  font-size: 14px;
  text-align: center;
}

/* ---------- 文档中心 ---------- */
.docs-group {
  margin-bottom: 36px;
}

.docs-group .section-heading {
  text-align: left;
  border-left: 4px solid var(--brand-primary);
  padding-left: 12px;
  margin-bottom: 16px;
}

.doc-card {
  display: block;
  color: var(--brand-text);
}

.doc-card:hover {
  border-color: var(--brand-primary);
}

.doc-card-more {
  display: inline-block;
  margin-top: 10px;
  font-size: 13px;
  color: var(--brand-primary);
}

/* ---------- 文档详情 ---------- */
.doc-layout {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.doc-sidebar {
  flex: none;
}

.doc-toc-toggle {
  background: var(--brand-surface);
  border: 1px solid var(--brand-border);
  border-radius: var(--brand-radius-lg);
  padding: 12px 16px;
  margin-bottom: 16px;
}

.doc-toc-toggle summary {
  cursor: pointer;
  font-weight: 600;
  font-size: 14px;
  min-height: 24px;
}

.doc-toc {
  display: flex;
  flex-direction: column;
  margin-top: 8px;
}

.doc-toc a {
  padding: 6px 0;
  font-size: 14px;
  color: var(--brand-text-secondary);
}

.doc-toc a:hover {
  color: var(--brand-primary);
}

.doc-toc a.toc-sub {
  padding-left: 16px;
  font-size: 13px;
}

.doc-siblings {
  background: var(--brand-surface);
  border: 1px solid var(--brand-border);
  border-radius: var(--brand-radius-lg);
  padding: 12px 16px;
  display: flex;
  flex-direction: column;
}

.doc-siblings-title {
  margin: 0 0 8px;
  font-size: 13px;
  color: var(--brand-text-muted);
}

.doc-siblings a {
  padding: 6px 0;
  font-size: 14px;
  color: var(--brand-text-secondary);
}

.doc-siblings a.active {
  color: var(--brand-primary);
  font-weight: 600;
}

.doc-article {
  flex: 1;
  min-width: 0;
  padding: 24px;
}

.breadcrumb {
  font-size: 13px;
  color: var(--brand-text-muted);
  margin-bottom: 12px;
}

.breadcrumb .sep {
  margin: 0 6px;
}

.doc-article h1 {
  margin: 0 0 20px;
  font-size: 26px;
  line-height: 1.4;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--brand-border);
}

/* Markdown 正文 */
.doc-content h2 {
  margin: 32px 0 12px;
  font-size: 20px;
  font-weight: 600;
}

.doc-content h3 {
  margin: 24px 0 10px;
  font-size: 16px;
  font-weight: 600;
}

.doc-content p {
  margin: 0 0 14px;
  color: var(--brand-text);
}

.doc-content ul,
.doc-content ol {
  margin: 0 0 14px;
  padding-left: 24px;
}

.doc-content li {
  margin-bottom: 6px;
}

.doc-content a {
  color: var(--brand-primary);
}

.doc-content blockquote {
  margin: 0 0 14px;
  padding: 10px 16px;
  border-left: 4px solid var(--brand-primary);
  background: var(--brand-primary-tint);
  border-radius: 0 var(--brand-radius-sm) var(--brand-radius-sm) 0;
  color: var(--brand-text-secondary);
}

.doc-content code {
  background: var(--brand-canvas);
  border: 1px solid var(--brand-border);
  border-radius: 4px;
  padding: 1px 6px;
  font-size: 13px;
}

.doc-content pre {
  background: var(--brand-text);
  color: #ffffff;
  border-radius: var(--brand-radius-sm);
  padding: 16px;
  overflow-x: auto;
}

.doc-content pre code {
  background: none;
  border: none;
  padding: 0;
  color: inherit;
}

.doc-content table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 14px;
  display: block;
  overflow-x: auto;
}

.doc-content th,
.doc-content td {
  border: 1px solid var(--brand-border);
  padding: 8px 12px;
  font-size: 14px;
  text-align: left;
}

.doc-content th {
  background: #f9fafb;
}

.empty-card {
  text-align: center;
  padding: 48px 20px;
}

.empty-card h1 {
  font-size: 20px;
  margin: 0 0 8px;
}

.empty-card p {
  margin-bottom: 20px;
}

/* ---------- 关于 / 联系 ---------- */
.prose-card {
  margin-top: 24px;
}

.prose-card h2 {
  margin: 0 0 12px;
  font-size: 18px;
}

.prose-card h2:not(:first-child) {
  margin-top: 24px;
}

.prose-card p {
  font-size: 15px;
  margin-bottom: 12px;
}

.contact-card {
  text-align: center;
}

/* ---------- 页脚 ---------- */
.site-footer {
  background: var(--brand-surface);
  border-top: 1px solid var(--brand-border);
  padding: 40px 0 24px;
  margin-top: 24px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  margin-bottom: 28px;
}

.footer-brand p {
  color: var(--brand-text-secondary);
  font-size: 14px;
  margin: 12px 0 0;
}

.footer-col h4 {
  margin: 0 0 12px;
  font-size: 14px;
  font-weight: 600;
}

.footer-col a {
  display: block;
  padding: 4px 0;
  color: var(--brand-text-secondary);
  font-size: 14px;
}

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

.footer-bottom {
  border-top: 1px solid var(--brand-border);
  padding-top: 20px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 13px;
  color: var(--brand-text-secondary);
}

/* ---------- 平板（769–1024px） ---------- */
@media (min-width: 769px) {
  .card-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

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

  .hero-actions {
    flex-direction: row;
    justify-content: center;
  }

  .hero-stats {
    flex-direction: row;
    justify-content: center;
    gap: 48px;
  }

  .flow-grid {
    flex-direction: row;
    align-items: stretch;
  }

  .flow-arrow {
    transform: none;
  }

  .footer-grid {
    grid-template-columns: 2fr 1fr 1fr;
  }

  .footer-bottom {
    flex-direction: row;
    justify-content: space-between;
  }
}

/* ---------- 桌面（≥1025px） ---------- */
@media (min-width: 1025px) {
  body {
    font-size: 15px;
  }

  .nav-toggle {
    display: none;
  }

  .site-nav {
    display: flex;
    position: static;
    flex-direction: row;
    align-items: center;
    gap: 8px;
    padding: 0;
    border-bottom: none;
    background: none;
  }

  .site-nav a {
    min-height: 44px;
    padding: 8px 14px;
    border-bottom: none;
    border-radius: var(--brand-radius-sm);
  }

  .site-nav a.active {
    background: var(--brand-primary-tint);
  }

  .btn-nav {
    margin-top: 0;
    min-height: 40px;
    padding: 6px 18px;
  }

  .hero {
    padding: 88px 0 72px;
  }

  .hero h1 {
    font-size: 44px;
  }

  .hero-sub {
    font-size: 18px;
  }

  .section {
    padding: 64px 0;
  }

  .section-heading {
    font-size: 28px;
  }

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

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

  .flow-grid-4 {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
  }

  .doc-layout {
    flex-direction: row;
    align-items: flex-start;
  }

  .doc-sidebar {
    width: 260px;
    position: sticky;
    top: 84px;
  }

  .doc-toc-toggle summary {
    pointer-events: none;
  }

  .doc-article {
    padding: 36px 40px;
  }
}