/* ==========================================================================
   飞鱼机场 (Feiyu Airport) - 极简高转化样式表
   策略：明亮白底、深海飞鱼蓝强调色、高对比度、无障碍、移动端优先
   ========================================================================== */

:root {
  --color-primary: #0284c7;
  --color-primary-hover: #0369a1;
  --color-primary-light: #e0f2fe;
  --color-accent: #0ea5e9;
  --color-bg: #ffffff;
  --color-bg-subtle: #f8fafc;
  --color-bg-card: #ffffff;
  --color-text-main: #0f172a;
  --color-text-muted: #475569;
  --color-border: #e2e8f0;
  --color-border-focus: #0284c7;
  --color-success: #16a34a;
  --color-warning: #ea580c;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(15, 23, 42, 0.08), 0 2px 4px -2px rgba(15, 23, 42, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(15, 23, 42, 0.08), 0 4px 6px -4px rgba(15, 23, 42, 0.04);
  --max-width: 1120px;
  --header-height: 70px;
}

/* 基础重置 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--color-text-main);
  background-color: var(--color-bg);
  line-height: 1.65;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-color: var(--color-bg);
  color: var(--color-text-main);
  font-size: 16px;
}

/* 无障碍跳过导航 */
.skip-link {
  position: absolute;
  top: -100px;
  left: 20px;
  background: var(--color-primary);
  color: #ffffff;
  padding: 12px 20px;
  z-index: 9999;
  border-radius: var(--radius-sm);
  font-weight: 600;
  text-decoration: none;
  transition: top 0.2s ease;
}
.skip-link:focus {
  top: 15px;
  outline: 3px solid #000;
}

/* 锚点偏移量，防止固定导航遮挡 */
[id] {
  scroll-margin-top: calc(var(--header-height) + 20px);
}

/* 容器与布局 */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

/* 导航栏 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
  height: var(--header-height);
  display: flex;
  align-items: center;
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--color-text-main);
  font-size: 1.25rem;
  font-weight: 700;
  min-height: 44px;
}

.brand-icon {
  width: 32px;
  height: 32px;
  flex-shrink: 0;
  object-fit: contain;
  vertical-align: middle;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 20px;
}

.nav-link {
  color: var(--color-text-muted);
  text-decoration: none;
  font-weight: 500;
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  transition: color 0.15s ease, background-color 0.15s ease;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}

.nav-link:hover, .nav-link:focus {
  color: var(--color-primary);
  background-color: var(--color-primary-light);
}

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

/* 顶部搜索框 */
.search-widget {
  position: relative;
  display: flex;
  align-items: center;
}

.search-input {
  padding: 8px 12px 8px 36px;
  font-size: 0.875rem;
  border: 1px solid var(--color-border);
  border-radius: 20px;
  width: 180px;
  background-color: var(--color-bg-subtle);
  color: var(--color-text-main);
  transition: all 0.2s ease;
  min-height: 40px;
}

.search-input:focus {
  outline: none;
  border-color: var(--color-primary);
  background-color: #fff;
  width: 240px;
  box-shadow: 0 0 0 3px rgba(2, 132, 199, 0.15);
}

.search-icon-btn {
  position: absolute;
  left: 10px;
  background: none;
  border: none;
  padding: 0;
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
}

/* 搜索结果下拉面板 */
.search-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  width: 320px;
  max-height: 380px;
  overflow-y: auto;
  background: #ffffff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  padding: 8px;
  display: none;
  z-index: 1010;
}

.search-dropdown.open {
  display: block;
}

.search-result-item {
  display: block;
  padding: 10px;
  border-radius: var(--radius-sm);
  text-decoration: none;
  color: var(--color-text-main);
  transition: background-color 0.15s ease;
}

.search-result-item:hover, .search-result-item:focus {
  background-color: var(--color-primary-light);
  outline: none;
}

.search-result-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 4px;
}

.search-result-snippet {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  line-height: 1.4;
}

/* 主内容区 */
main {
  flex: 1;
}

/* 按钮通用 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  text-decoration: none;
  cursor: pointer;
  transition: all 0.15s ease;
  min-height: 48px;
  border: none;
}

.btn-primary {
  background-color: var(--color-primary);
  color: #ffffff;
  box-shadow: var(--shadow-md);
}

.btn-primary:hover, .btn-primary:focus {
  background-color: var(--color-primary-hover);
  box-shadow: var(--shadow-lg);
  transform: translateY(-1px);
}

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

.btn-outline:hover, .btn-outline:focus {
  background-color: var(--color-primary-light);
}

.btn-sm {
  padding: 8px 16px;
  font-size: 0.875rem;
  min-height: 40px;
}

/* Hero 区域：方案 02 视觉素材与极淡水纹动效 */
.hero-section {
  position: relative;
  overflow: hidden;
  padding: 40px 0 24px;
  background-color: #f9fdfe;
  background-image: url('/assets/feiyu/hero-desktop.webp');
  background-repeat: no-repeat;
  background-position: center top;
  background-size: cover;
  border-bottom: 1px solid var(--color-border);
}

/* 手机端背景切换 (<= 767px) */
@media (max-width: 767px) {
  .hero-section {
    background-image: url('/assets/feiyu/hero-mobile.webp');
    background-position: center top;
    background-size: cover;
  }
}

/* 极淡水纹扩散 CSS 动效：周期 7s，柔和自然，pointer-events: none */
.hero-section::before,
.hero-section::after {
  content: "";
  position: absolute;
  top: 32%;
  left: 50%;
  width: 220px;
  height: 220px;
  border: 1px solid #6bc6d5;
  border-radius: 50%;
  transform: translate(-50%, -50%) scale(0.6);
  opacity: 0;
  pointer-events: none;
  z-index: 1;
}

.hero-section::before {
  animation: rippleSpread 7s cubic-bezier(0.2, 0.4, 0.4, 1) infinite;
}

.hero-section::after {
  animation: rippleSpread 7s cubic-bezier(0.2, 0.4, 0.4, 1) infinite 3.5s;
}

@keyframes rippleSpread {
  0% {
    transform: translate(-50%, -50%) scale(0.6);
    opacity: 0.10;
  }
  50% {
    opacity: 0.05;
  }
  100% {
    transform: translate(-50%, -50%) scale(4.8);
    opacity: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .hero-section::before,
  .hero-section::after {
    animation: none !important;
    display: none !important;
  }
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 1060px;
  margin: 0 auto;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background-color: var(--color-primary-light);
  color: var(--color-primary-hover);
  font-size: 0.875rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 20px;
  margin-bottom: 16px;
}

.hero-title {
  font-size: 2.25rem;
  line-height: 1.25;
  font-weight: 800;
  color: var(--color-text-main);
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}

.hero-subtitle {
  font-size: 1.125rem;
  color: var(--color-text-muted);
  margin-bottom: 24px;
  line-height: 1.6;
}

/* 最低价重点横幅 */
.lowest-price-banner {
  background: #ffffff;
  border: 2px solid var(--color-primary);
  border-radius: var(--radius-lg);
  padding: 16px 24px;
  margin: 0 auto 32px;
  max-width: 760px;
  box-shadow: var(--shadow-md);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  text-align: left;
}

.price-text-group {
  display: flex;
  flex-direction: column;
}

.price-label {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  font-weight: 500;
}

.price-highlight {
  font-size: 1.625rem;
  font-weight: 800;
  color: var(--color-primary);
}

.price-extra-note {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

/* 热门套餐三列卡片：桌面端严格 3x1 并排展示 */
.hot-plans-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 10px;
  text-align: left;
}

@media (max-width: 960px) {
  .hot-plans-grid {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  }
}

.plan-card {
  background: #ffffff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  position: relative;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.plan-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-primary);
}

.plan-card.featured {
  border: 2px solid var(--color-primary);
  background: #ffffff;
}

.plan-badge {
  position: absolute;
  top: -12px;
  right: 20px;
  background: var(--color-primary);
  color: #ffffff;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 12px;
  text-transform: uppercase;
}

.plan-name {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text-main);
  margin-bottom: 6px;
}

.plan-desc {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-bottom: 16px;
}

.plan-price-wrap {
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--color-border);
}

.plan-currency {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-primary);
}

.plan-amount {
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1;
}

.plan-cycle {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.plan-features-list {
  list-style: none;
  margin-bottom: 24px;
  flex: 1;
}

.plan-features-list li {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.plan-features-list li::before {
  content: "✓";
  color: var(--color-success);
  font-weight: 800;
}

/* 内容区块统一样式 */
.section {
  padding: 60px 0;
}

.section-alt {
  background-color: var(--color-bg-subtle);
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 40px;
}

.section-title {
  font-size: 1.875rem;
  font-weight: 800;
  color: var(--color-text-main);
  margin-bottom: 12px;
}

.section-subtitle {
  font-size: 1rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* 完整套餐表格 */
.table-container {
  width: 100%;
  overflow-x: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: #ffffff;
  box-shadow: var(--shadow-sm);
  margin-bottom: 20px;
  -webkit-overflow-scrolling: touch;
}

.pricing-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 680px;
  text-align: left;
}

.pricing-table caption {
  padding: 14px;
  font-size: 0.875rem;
  color: var(--color-text-muted);
  caption-side: bottom;
  text-align: left;
  background-color: var(--color-bg-subtle);
  border-top: 1px solid var(--color-border);
}

.pricing-table th, .pricing-table td {
  padding: 14px 18px;
  border-bottom: 1px solid var(--color-border);
  font-size: 0.9375rem;
}

.pricing-table th {
  background-color: var(--color-bg-subtle);
  color: var(--color-text-main);
  font-weight: 700;
}

.pricing-table tr:hover td {
  background-color: #f1f5f9;
}

/* 三步快速上手 */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.step-card {
  background: #ffffff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  position: relative;
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background-color: var(--color-primary);
  color: #ffffff;
  border-radius: 50%;
  font-weight: 800;
  font-size: 1.125rem;
  margin-bottom: 16px;
}

.step-title {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.step-desc {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* 客户端兼容卡片网格 */
.client-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

.client-item {
  background: #ffffff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
  text-align: center;
  box-shadow: var(--shadow-sm);
}

.client-platform {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--color-text-main);
}

.client-app-name {
  font-size: 0.875rem;
  color: var(--color-primary);
  font-weight: 600;
  margin-bottom: 8px;
}

.client-link {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  text-decoration: underline;
  display: inline-block;
  margin-top: 6px;
}

/* 节点知识与协议卡片 */
.protocol-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

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

.protocol-card h3 {
  font-size: 1.125rem;
  color: var(--color-primary-hover);
  margin-bottom: 10px;
}

.protocol-card p {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* FAQ 列表样式（原生 details/summary，可键盘访问） */
.faq-list {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: #ffffff;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.faq-question {
  padding: 16px 20px;
  font-weight: 700;
  font-size: 1rem;
  color: var(--color-text-main);
  cursor: pointer;
  outline: none;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
}

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

.faq-question::after {
  content: "+";
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-primary);
  transition: transform 0.2s ease;
}

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

.faq-item:focus-within {
  border-color: var(--color-primary);
}

.faq-answer {
  padding: 0 20px 18px;
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  line-height: 1.65;
  border-top: 1px solid var(--color-border);
  padding-top: 14px;
}

/* 九篇文章入口卡片网格 */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 20px;
}

.article-card {
  background: #ffffff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 22px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: transform 0.15s ease, border-color 0.15s ease;
}

.article-card:hover {
  transform: translateY(-2px);
  border-color: var(--color-primary);
}

.article-card-tag {
  font-size: 0.75rem;
  color: var(--color-primary);
  font-weight: 700;
  text-transform: uppercase;
  margin-bottom: 8px;
}

.article-card-title {
  font-size: 1.0625rem;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 8px;
}

.article-card-title a {
  color: var(--color-text-main);
  text-decoration: none;
}

.article-card-title a:hover {
  color: var(--color-primary);
}

.article-card-desc {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.5;
  margin-bottom: 16px;
  flex: 1;
}

.article-card-footer {
  font-size: 0.8125rem;
  color: var(--color-primary);
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 4px;
}

/* 文章详情页专用排版 */
.article-header {
  padding: 40px 0 24px;
  background-color: var(--color-bg-subtle);
  border-bottom: 1px solid var(--color-border);
}

.breadcrumbs {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
}

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

.article-post-title {
  font-size: 2.125rem;
  font-weight: 800;
  line-height: 1.3;
  color: var(--color-text-main);
  margin-bottom: 12px;
}

.article-meta {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.article-content-wrapper {
  padding: 48px 0;
}

.article-prose {
  max-width: 820px;
  margin: 0 auto;
}

.article-prose h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin: 36px 0 16px;
  color: var(--color-text-main);
  border-left: 4px solid var(--color-primary);
  padding-left: 12px;
}

.article-prose h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin: 24px 0 12px;
  color: var(--color-text-main);
}

.article-prose p {
  font-size: 1rem;
  color: #334155;
  margin-bottom: 18px;
  line-height: 1.75;
}

.article-prose ul, .article-prose ol {
  margin: 0 0 20px 24px;
  color: #334155;
}

.article-prose li {
  margin-bottom: 8px;
  line-height: 1.65;
}

.article-prose code {
  background: var(--color-bg-subtle);
  border: 1px solid var(--color-border);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  color: #c026d3;
}

.article-prose pre {
  background: #0f172a;
  color: #f8fafc;
  padding: 16px;
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin-bottom: 20px;
}

.article-prose pre code {
  background: transparent;
  border: none;
  color: inherit;
  padding: 0;
}

.callout-box {
  background: var(--color-primary-light);
  border-left: 4px solid var(--color-primary);
  padding: 16px 20px;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin: 24px 0;
}

.callout-title {
  font-weight: 700;
  color: var(--color-primary-hover);
  margin-bottom: 6px;
}

.article-cta-box {
  background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
  border: 1px solid #bae6fd;
  border-radius: var(--radius-lg);
  padding: 28px;
  margin: 40px 0;
  text-align: center;
}

.article-cta-box h3 {
  margin-top: 0;
  margin-bottom: 10px;
  color: var(--color-text-main);
}

.article-cta-box p {
  color: var(--color-text-muted);
  margin-bottom: 20px;
}

/* 页脚 Footer：硬性仅 4 个独立页面入口 */
.site-footer {
  background-color: #0f172a;
  color: #94a3b8;
  padding: 40px 0 28px;
  margin-top: auto;
  border-top: 1px solid #1e293b;
}

.footer-nav {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 28px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.footer-nav a {
  color: #cbd5e1;
  text-decoration: none;
  font-size: 0.9375rem;
  font-weight: 500;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  transition: color 0.15s ease;
}

.footer-nav a:hover, .footer-nav a:focus {
  color: #38bdf8;
  outline: none;
}

.footer-disclaimer {
  text-align: center;
  font-size: 0.8125rem;
  line-height: 1.6;
  max-width: 800px;
  margin: 0 auto;
  color: #64748b;
}

/* 移动端与自适应响应 */
@media (max-width: 768px) {
  :root {
    --header-height: auto;
  }
  
  .site-header {
    padding: 10px 0;
  }

  .header-inner {
    flex-wrap: wrap;
    justify-content: space-between;
  }

  .site-nav {
    order: 3;
    width: 100%;
    justify-content: flex-start;
    gap: 10px;
    padding-top: 8px;
    border-top: 1px solid var(--color-border);
  }

  .search-widget {
    order: 2;
  }

  .search-input {
    width: 140px;
  }

  .search-input:focus {
    width: 180px;
  }

  .hero-title {
    font-size: 1.75rem;
  }

  .hero-subtitle {
    font-size: 1rem;
  }

  .lowest-price-banner {
    flex-direction: column;
    text-align: center;
    padding: 16px;
  }

  .btn {
    width: 100%;
  }

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

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}