/* ==========================================================================
   飞机云 Feiji Cloud 官网样式表
   主题：Sky Route Minimal｜轻航线极简风
   域名：https://feijicloud.shop/
   规范：纯净极简、航空科技感、极速响应、无横向溢出、符合技术 SEO
   ========================================================================== */

:root {
  --bg-color: #FFFFFF;
  --bg-light: #F5F9FD;
  --bg-card: #FFFFFF;
  --bg-hover: #EBF4FC;
  --primary: #168BDF;
  --primary-hover: #1274BD;
  --primary-light: #E8F4FC;
  --secondary: #64C7F2;
  --secondary-light: #EBF8FE;
  --text-heading: #15283D;
  --text-body: #526477;
  --text-muted: #8295A8;
  --border-color: #E5EDF5;
  --border-light: #F0F5FA;
  
  --shadow-sm: 0 2px 8px rgba(21, 40, 61, 0.04);
  --shadow-md: 0 6px 20px rgba(22, 139, 223, 0.08);
  --shadow-lg: 0 12px 32px rgba(22, 139, 223, 0.12);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  --max-width: 1200px;
  --header-height: 72px;
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
}

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

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

body {
  font-family: var(--font-family);
  background-color: var(--bg-color);
  color: var(--text-body);
  line-height: 1.7;
  letter-spacing: 0.01em;
  overflow-x: hidden;
  padding-top: var(--header-height);
}

body.modal-open {
  overflow: hidden;
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: color 0.2s ease, transform 0.2s ease;
}

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

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

ul, ol {
  list-style: none;
}

button, input {
  font-family: inherit;
  font-size: inherit;
}

/* 布局容器 */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

.section {
  padding: 80px 0;
  position: relative;
}

.section-light {
  background-color: var(--bg-light);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 52px;
}

.section-tag {
  display: inline-block;
  padding: 4px 14px;
  background-color: var(--primary-light);
  color: var(--primary);
  font-size: 0.85rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  margin-bottom: 14px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.section-title {
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--text-heading);
  line-height: 1.35;
  margin-bottom: 16px;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-body);
  line-height: 1.75;
}

/* 按钮规范 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.25s ease;
  line-height: 1.4;
  text-align: center;
  text-decoration: none;
}

.btn-primary {
  background-color: var(--primary);
  color: #FFFFFF;
  box-shadow: 0 4px 14px rgba(22, 139, 223, 0.35);
}

.btn-primary:hover {
  background-color: var(--primary-hover);
  color: #FFFFFF;
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(22, 139, 223, 0.45);
}

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

.btn-outline:hover {
  background-color: var(--primary-light);
  color: var(--primary-hover);
  transform: translateY(-2px);
}

.btn-sm {
  padding: 8px 18px;
  font-size: 0.9rem;
}

/* ==========================================================================
   Header 导航规范
   ========================================================================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  background-color: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  z-index: 1000;
  transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

.site-header .header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  cursor: pointer;
}

.brand-logo {
  width: 38px;
  height: 38px;
  object-fit: contain;
  transition: transform 0.3s ease;
}

.brand-link:hover .brand-logo {
  transform: scale(1.08) rotate(-4deg);
}

.brand-text-wrap {
  display: flex;
  flex-direction: column;
}

.brand-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-heading);
  letter-spacing: -0.01em;
  line-height: 1.2;
}

.brand-tagline {
  font-size: 0.72rem;
  color: var(--text-muted);
  letter-spacing: 0.04em;
  font-weight: 500;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-link {
  font-size: 0.96rem;
  font-weight: 500;
  color: var(--text-body);
  transition: color 0.2s ease;
  position: relative;
  padding: 6px 0;
}

.nav-link:hover,
.nav-link.active {
  color: var(--primary);
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--primary);
  transition: width 0.25s ease;
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

.nav-action {
  display: flex;
  align-items: center;
  gap: 14px;
}

/* 汉堡菜单按钮 (移动端) */
.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  color: var(--text-heading);
}

.mobile-menu-btn svg {
  width: 26px;
  height: 26px;
}

/* ==========================================================================
   Hero 区域
   ========================================================================== */
.hero-section {
  padding: 70px 0 90px;
  background: radial-gradient(circle at 85% 20%, rgba(100, 199, 242, 0.12) 0%, rgba(245, 249, 253, 0.4) 50%, rgba(255, 255, 255, 0) 100%), #FFFFFF;
  position: relative;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  align-items: center;
  gap: 48px;
}

.hero-content {
  max-width: 650px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background-color: var(--primary-light);
  color: var(--primary);
  border-radius: var(--radius-full);
  font-size: 0.88rem;
  font-weight: 600;
  margin-bottom: 22px;
}

.hero-badge .badge-icon {
  width: 8px;
  height: 8px;
  background-color: var(--primary);
  border-radius: 50%;
  box-shadow: 0 0 0 4px rgba(22, 139, 223, 0.2);
}

.hero-title {
  font-size: 3.1rem;
  font-weight: 800;
  color: var(--text-heading);
  line-height: 1.2;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.hero-subtitle {
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 20px;
}

.hero-intro {
  font-size: 1.05rem;
  color: var(--text-body);
  line-height: 1.8;
  margin-bottom: 34px;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
}

.hero-features-bar {
  display: flex;
  align-items: center;
  gap: 28px;
  margin-top: 40px;
  padding-top: 28px;
  border-top: 1px solid var(--border-color);
}

.hero-feature-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.92rem;
  color: var(--text-heading);
  font-weight: 500;
}

.hero-feature-item svg {
  color: var(--primary);
  flex-shrink: 0;
}

/* Hero 右侧航空轻量插画 */
.hero-visual {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

.flight-radar-wrap {
  position: relative;
  width: 100%;
  max-width: 440px;
  aspect-ratio: 1 / 1;
  display: flex;
  justify-content: center;
  align-items: center;
}

.radar-circle {
  position: absolute;
  border-radius: 50%;
  border: 1px dashed rgba(22, 139, 223, 0.22);
}

.radar-circle-1 {
  width: 90%;
  height: 90%;
  animation: radarRotate 40s linear infinite;
}

.radar-circle-2 {
  width: 65%;
  height: 65%;
  border-style: solid;
  border-color: rgba(100, 199, 242, 0.25);
}

.radar-circle-3 {
  width: 40%;
  height: 40%;
  background: radial-gradient(circle, rgba(22, 139, 223, 0.08) 0%, rgba(255, 255, 255, 0) 70%);
}

.flight-route-svg {
  position: absolute;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.plane-center-card {
  position: relative;
  z-index: 10;
  width: 170px;
  height: 170px;
  background: #FFFFFF;
  border-radius: 36px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-lg), 0 0 0 8px rgba(245, 249, 253, 0.9);
  animation: planeFloat 5s ease-in-out infinite;
  border: 1px solid var(--border-color);
}

.plane-center-card img {
  width: 90px;
  height: 90px;
  object-fit: contain;
}

.plane-badge-text {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--primary);
  margin-top: 6px;
  letter-spacing: 0.08em;
}

.floating-pill {
  position: absolute;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  padding: 8px 16px;
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-heading);
  z-index: 12;
}

.floating-pill.pill-hk {
  top: 12%;
  left: 6%;
  animation: floatSubtle 6s ease-in-out infinite 0.5s;
}

.floating-pill.pill-jp {
  bottom: 16%;
  left: 8%;
  animation: floatSubtle 7s ease-in-out infinite 1.2s;
}

.floating-pill.pill-sg {
  top: 18%;
  right: 4%;
  animation: floatSubtle 6.5s ease-in-out infinite 1.8s;
}

.floating-pill.pill-us {
  bottom: 14%;
  right: 6%;
  animation: floatSubtle 7.5s ease-in-out infinite 2.4s;
}

.floating-pill .pill-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: #10B981;
}

/* ==========================================================================
   服务优势区域
   ========================================================================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px 26px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
  position: relative;
  display: flex;
  flex-direction: column;
}

.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
  border-color: var(--secondary);
}

.feature-icon-wrap {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background-color: var(--primary-light);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 22px;
}

.feature-card-title {
  font-size: 1.22rem;
  font-weight: 700;
  color: var(--text-heading);
  margin-bottom: 12px;
  line-height: 1.4;
}

.feature-card-desc {
  font-size: 0.95rem;
  color: var(--text-body);
  line-height: 1.7;
}

.feature-disclaimer-box {
  margin-top: 40px;
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--primary);
  border-radius: var(--radius-sm);
  padding: 18px 24px;
  display: flex;
  align-items: flex-start;
  gap: 14px;
}

.feature-disclaimer-box svg {
  color: var(--primary);
  flex-shrink: 0;
  margin-top: 2px;
}

.feature-disclaimer-text {
  font-size: 0.88rem;
  color: var(--text-body);
  line-height: 1.6;
}

/* ==========================================================================
   节点地区介绍区域
   ========================================================================== */
.nodes-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.node-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px 22px;
  box-shadow: var(--shadow-sm);
  transition: all 0.25s ease;
}

.node-card:hover {
  transform: translateY(-4px);
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
}

.node-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-light);
}

.node-name-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
}

.node-flag {
  font-size: 1.5rem;
  line-height: 1;
}

.node-name {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-heading);
}

.node-type-tag {
  font-size: 0.75rem;
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  background-color: var(--primary-light);
  color: var(--primary);
  font-weight: 600;
}

.node-spec-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 18px;
}

.node-spec-row {
  display: flex;
  justify-content: space-between;
  font-size: 0.88rem;
}

.node-spec-label {
  color: var(--text-muted);
}

.node-spec-value {
  color: var(--text-heading);
  font-weight: 600;
}

.node-desc {
  font-size: 0.9rem;
  color: var(--text-body);
  line-height: 1.65;
  background-color: var(--bg-light);
  padding: 12px;
  border-radius: var(--radius-sm);
}

/* ==========================================================================
   套餐价格区域
   ========================================================================== */
.plans-filter-bar {
  display: flex;
  justify-content: center;
  align-items: center;
  margin-bottom: 36px;
  gap: 10px;
}

.billing-cycle-toggle {
  display: inline-flex;
  padding: 4px;
  background-color: #EBF2F9;
  border-radius: var(--radius-full);
}

.cycle-btn {
  padding: 8px 22px;
  border-radius: var(--radius-full);
  border: none;
  background: transparent;
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-body);
  cursor: pointer;
  transition: all 0.2s ease;
}

.cycle-btn.active {
  background: #FFFFFF;
  color: var(--primary);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.cycle-btn.disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.plans-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  align-items: stretch;
}

.plan-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  display: flex;
  flex-direction: column;
  position: relative;
  box-shadow: var(--shadow-sm);
  transition: all 0.25s ease;
}

.plan-card:hover {
  transform: translateY(-6px);
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
}

.plan-card.highlight {
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
  background: linear-gradient(180deg, #FAFDFF 0%, #FFFFFF 100%);
}

.plan-badge {
  position: absolute;
  top: -12px;
  right: 24px;
  background: var(--primary);
  color: #FFFFFF;
  font-size: 0.76rem;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  letter-spacing: 0.03em;
}

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

.plan-name {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-heading);
  margin-bottom: 8px;
}

.plan-suitability {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
  min-height: 38px;
}

.plan-price-wrap {
  display: flex;
  align-items: baseline;
  margin: 18px 0 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-light);
}

.plan-currency {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--primary);
  margin-right: 2px;
}

.plan-amount {
  font-size: 2.6rem;
  font-weight: 800;
  color: var(--text-heading);
  line-height: 1;
}

.plan-period {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-left: 6px;
}

.plan-status-tag {
  display: inline-block;
  padding: 2px 8px;
  background-color: #FEF3C7;
  color: #92400E;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 600;
  margin-bottom: 16px;
}

.plan-specs {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 28px;
  flex-grow: 1;
}

.plan-spec-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.92rem;
  color: var(--text-body);
  line-height: 1.5;
}

.plan-spec-item svg {
  color: #10B981;
  flex-shrink: 0;
  margin-top: 3px;
}

.plan-action {
  margin-top: auto;
}

.plan-action .btn {
  width: 100%;
}

.plans-notice-card {
  margin-top: 40px;
  background-color: #F8FAFC;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 22px 28px;
  display: flex;
  align-items: flex-start;
  gap: 16px;
}

.plans-notice-card svg {
  color: var(--primary);
  flex-shrink: 0;
  margin-top: 3px;
}

.plans-notice-content h4 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-heading);
  margin-bottom: 6px;
}

.plans-notice-content p {
  font-size: 0.88rem;
  color: var(--text-body);
  line-height: 1.65;
}

/* ==========================================================================
   三步开始使用指南
   ========================================================================== */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  position: relative;
}

.step-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 36px 30px;
  position: relative;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
}

.step-number {
  width: 44px;
  height: 44px;
  background-color: var(--primary);
  color: #FFFFFF;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  font-weight: 800;
  margin-bottom: 22px;
  box-shadow: 0 4px 12px rgba(22, 139, 223, 0.3);
}

.step-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-heading);
  margin-bottom: 12px;
}

.step-desc {
  font-size: 0.96rem;
  color: var(--text-body);
  line-height: 1.75;
  margin-bottom: 18px;
}

.step-tips {
  margin-top: auto;
  padding: 12px 14px;
  background-color: var(--bg-light);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ==========================================================================
   六篇知识文章卡片区域
   ========================================================================== */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 30px 26px;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-sm);
  transition: all 0.25s ease;
}

.article-card:hover {
  transform: translateY(-5px);
  border-color: var(--secondary);
  box-shadow: var(--shadow-md);
}

.article-category {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 12px;
}

.article-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-heading);
  line-height: 1.45;
  margin-bottom: 14px;
}

.article-summary {
  font-size: 0.92rem;
  color: var(--text-body);
  line-height: 1.7;
  margin-bottom: 24px;
  flex-grow: 1;
}

.article-card-footer {
  margin-top: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 18px;
  border-top: 1px solid var(--border-light);
}

.article-read-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--primary);
  transition: gap 0.2s ease;
}

.article-read-btn:hover {
  color: var(--primary-hover);
  gap: 10px;
}

.article-meta-info {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ==========================================================================
   FAQ 常见问题区域
   ========================================================================== */
.faq-wrap {
  max-width: 860px;
  margin: 0 auto;
}

.faq-item {
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  margin-bottom: 16px;
  background-color: var(--bg-card);
  transition: border-color 0.2s ease;
  overflow: hidden;
}

.faq-item:hover {
  border-color: var(--secondary);
}

.faq-question {
  width: 100%;
  text-align: left;
  padding: 20px 24px;
  background: none;
  border: none;
  font-size: 1.08rem;
  font-weight: 600;
  color: var(--text-heading);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}

.faq-icon {
  width: 20px;
  height: 20px;
  color: var(--primary);
  transition: transform 0.25s ease;
  flex-shrink: 0;
}

.faq-item.active .faq-icon {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s cubic-bezier(0, 1, 0, 1), padding 0.3s ease;
  padding: 0 24px;
  font-size: 0.95rem;
  color: var(--text-body);
  line-height: 1.75;
}

.faq-item.active .faq-answer {
  max-height: 600px;
  padding: 0 24px 22px 24px;
  transition: max-height 0.3s ease-in-out;
}

/* ==========================================================================
   Footer 页脚规范
   ========================================================================== */
.site-footer {
  background-color: #0E1B2B;
  color: #A3B5C7;
  padding: 70px 0 30px;
  border-top: 1px solid #1D2D42;
}

.footer-top {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
  gap: 40px;
  margin-bottom: 50px;
}

.footer-brand .brand-title {
  color: #FFFFFF;
}

.footer-desc {
  font-size: 0.9rem;
  color: #8CA0B4;
  line-height: 1.75;
  margin-top: 16px;
  max-width: 320px;
}

.footer-column h4 {
  font-size: 1.05rem;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 20px;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-link {
  font-size: 0.9rem;
  color: #8CA0B4;
  transition: color 0.2s ease;
}

.footer-link:hover {
  color: #FFFFFF;
}

.footer-status-box {
  background-color: #16263A;
  border: 1px solid #243852;
  border-radius: var(--radius-sm);
  padding: 14px;
  font-size: 0.85rem;
  line-height: 1.6;
}

.footer-bottom {
  padding-top: 28px;
  border-top: 1px solid #1A2C42;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  color: #6C8197;
  flex-wrap: wrap;
  gap: 14px;
}

.footer-bottom-links {
  display: flex;
  gap: 20px;
}

/* ==========================================================================
   文章详情页独立排版规范
   ========================================================================== */
.article-page {
  padding: 50px 0 90px;
}

.breadcrumb-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 28px;
}

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

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

.breadcrumb-separator {
  color: #C0D0E0;
}

.article-layout {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 48px;
  align-items: start;
}

.article-main {
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 44px 40px;
  box-shadow: var(--shadow-sm);
}

.article-header {
  margin-bottom: 36px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--border-color);
}

.article-main-title {
  font-size: 2.3rem;
  font-weight: 800;
  color: var(--text-heading);
  line-height: 1.35;
  margin-bottom: 18px;
}

.article-meta-bar {
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 0.88rem;
  color: var(--text-muted);
  flex-wrap: wrap;
}

.article-meta-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.article-content {
  font-size: 1.05rem;
  color: #334155;
  line-height: 1.85;
}

.article-content h2 {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text-heading);
  margin: 40px 0 18px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--border-color);
  position: relative;
}

.article-content h2::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 48px;
  height: 2px;
  background-color: var(--primary);
}

.article-content h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-heading);
  margin: 28px 0 14px;
}

.article-content p {
  margin-bottom: 20px;
}

.article-content ul, .article-content ol {
  margin: 18px 0 24px 24px;
}

.article-content ul li {
  list-style-type: disc;
  margin-bottom: 10px;
}

.article-content ol li {
  list-style-type: decimal;
  margin-bottom: 10px;
}

.article-content blockquote {
  margin: 24px 0;
  padding: 18px 24px;
  background-color: var(--bg-light);
  border-left: 4px solid var(--primary);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-style: normal;
  color: var(--text-heading);
}

.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 26px 0;
  font-size: 0.95rem;
}

.article-content th, .article-content td {
  padding: 12px 16px;
  border: 1px solid var(--border-color);
  text-align: left;
}

.article-content th {
  background-color: var(--bg-light);
  font-weight: 700;
  color: var(--text-heading);
}

.article-callout {
  margin: 26px 0;
  padding: 20px 24px;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  display: flex;
  align-items: flex-start;
  gap: 14px;
}

.article-callout.tip {
  background-color: var(--secondary-light);
  border-color: #BBE7FB;
  color: #075985;
}

.article-callout.warning {
  background-color: #FEF3C7;
  border-color: #FDE68A;
  color: #92400E;
}

.article-callout svg {
  flex-shrink: 0;
  margin-top: 3px;
}

.article-back-bar {
  margin-top: 48px;
  padding-top: 28px;
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.article-sidebar {
  display: flex;
  flex-direction: column;
  gap: 24px;
  position: sticky;
  top: calc(var(--header-height) + 24px);
}

.sidebar-widget {
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--shadow-sm);
}

.sidebar-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-heading);
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-light);
}

.sidebar-article-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.sidebar-article-link {
  font-size: 0.92rem;
  color: var(--text-body);
  line-height: 1.5;
  transition: color 0.2s ease;
  display: block;
}

.sidebar-article-link:hover {
  color: var(--primary);
}

/* ==========================================================================
   全局通用弹窗规范 (Notice Modal)
   ========================================================================== */
.feiji-modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: rgba(14, 27, 43, 0.6);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  padding: 20px;
  animation: modalFadeIn 0.25s ease-out;
}

.feiji-modal-overlay.closing {
  animation: modalFadeOut 0.2s ease-in forwards;
}

.feiji-modal-card {
  background: #FFFFFF;
  border-radius: var(--radius-lg);
  max-width: 480px;
  width: 100%;
  padding: 28px 24px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
  border: 1px solid var(--border-color);
  transform: translateY(0);
  transition: transform 0.2s ease;
}

.feiji-modal-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
  position: relative;
}

.feiji-modal-icon {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: var(--primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.feiji-modal-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-heading);
  flex-grow: 1;
}

.feiji-modal-close {
  background: none;
  border: none;
  font-size: 1.6rem;
  color: var(--text-muted);
  cursor: pointer;
  line-height: 1;
  padding: 4px;
}

.feiji-modal-close:hover {
  color: var(--text-heading);
}

.feiji-modal-body p {
  font-size: 0.95rem;
  color: var(--text-body);
  line-height: 1.7;
  margin-bottom: 18px;
}

.feiji-modal-status-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  padding: 6px 12px;
  background-color: var(--bg-light);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-heading);
  font-weight: 500;
}

.feiji-modal-status-badge .status-dot {
  width: 8px;
  height: 8px;
  background-color: #F59E0B;
  border-radius: 50%;
}

.feiji-modal-footer {
  margin-top: 24px;
  text-align: right;
}

/* ==========================================================================
   动画与关键帧
   ========================================================================== */
@keyframes planeFloat {
  0%, 100% {
    transform: translateY(0) rotate(0deg);
  }
  50% {
    transform: translateY(-10px) rotate(1.5deg);
  }
}

@keyframes floatSubtle {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-6px);
  }
}

@keyframes radarRotate {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

@keyframes modalFadeIn {
  from {
    opacity: 0;
    transform: scale(0.96);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes modalFadeOut {
  from {
    opacity: 1;
    transform: scale(1);
  }
  to {
    opacity: 0;
    transform: scale(0.96);
  }
}

/* 无障碍与减少动态效果支持 (prefers-reduced-motion) */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .radar-circle-1,
  .plane-center-card,
  .floating-pill {
    animation: none !important;
  }
}

/* ==========================================================================
   响应式断点适配 (Responsive Breakpoints)
   ========================================================================== */
@media (max-width: 1080px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 40px;
  }

  .hero-content {
    max-width: 100%;
    margin: 0 auto;
  }

  .hero-actions {
    justify-content: center;
  }

  .hero-features-bar {
    justify-content: center;
  }

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

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

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

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

  .article-sidebar {
    position: static;
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 64px;
  }

  .section {
    padding: 60px 0;
  }

  .section-title {
    font-size: 1.8rem;
  }

  .hero-title {
    font-size: 2.3rem;
  }

  .hero-subtitle {
    font-size: 1.15rem;
  }

  .main-nav {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    width: 100%;
    background-color: #FFFFFF;
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-md);
    flex-direction: column;
    padding: 20px 24px;
    gap: 16px;
    align-items: flex-start;
  }

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

  .mobile-menu-btn {
    display: block;
  }

  .features-grid,
  .nodes-grid,
  .plans-grid,
  .steps-grid,
  .articles-grid {
    grid-template-columns: 1fr;
  }

  .hero-features-bar {
    flex-direction: column;
    gap: 14px;
    align-items: center;
  }

  .footer-top {
    grid-template-columns: 1fr;
    gap: 30px;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
    gap: 12px;
  }

  .article-main {
    padding: 28px 20px;
  }

  .article-main-title {
    font-size: 1.7rem;
  }
}