/* ==========================================================================
   小蜜蜂 (BeeFast Accelerator) - 霜月冷白 (Frost Moon White) 原生现代样式表
   零重型库依赖 · 极简秒开 · 移动端优先响应式 · 纯原生 CSS · 细节全面增强
   ========================================================================== */

:root {
  /* 霜月冷白色彩体系 */
  --bg-main: #F8FAFD;            /* 霜月底色：极浅冰霜冷白 */
  --bg-card: #FFFFFF;            /* 纯白卡片表面 */
  --bg-card-hover: #F1F5F9;      /* 卡片悬停微冷灰 */
  --bg-subtle: #EDF2F7;          /* 辅助冷灰背景 */
  --bg-glass: rgba(255, 255, 255, 0.88); /* 霜月冰晶毛玻璃 */
  
  /* 冷月质感文字体系 */
  --text-primary: #0F172A;        /* 深度冷墨黑（标题、高权重文本） */
  --text-secondary: #334155;      /* 矿石冷灰（正文描述） */
  --text-muted: #64748B;          /* 霜雾浅灰（辅助说明、标签） */
  --text-light: #94A3B8;          /* 极浅灰 */

  /* 霜月冷调强调色与光泽 */
  --accent-primary: #0284C7;      /* 冰晶冷蓝（主交互色） */
  --accent-hover: #0369A1;        /* 冰蓝悬浮态 */
  --accent-light: #E0F2FE;        /* 冰川淡蓝底衬 */
  --accent-glow: rgba(2, 132, 199, 0.18); /* 冰蓝冷辉光 */
  
  /* 品牌微金冷晶点缀（蜜蜂灵感） */
  --honey-frost: #D97706;         /* 极简冷金（标签徽章微量点缀） */
  --honey-light: #FEF3C7;         /* 冷金淡衬底 */

  /* 边框体系 */
  --border-light: #E2E8F0;        /* 极细冷灰边框 */
  --border-focus: #CBD5E1;        /* 聚焦/激活冷灰边框 */
  --border-accent: rgba(2, 132, 199, 0.35); /* 冰蓝微亮边框 */

  /* 极简高级阴影 */
  --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.04);
  --shadow-md: 0 8px 24px -4px rgba(15, 23, 42, 0.06), 0 2px 6px -1px rgba(15, 23, 42, 0.02);
  --shadow-lg: 0 16px 36px -6px rgba(15, 23, 42, 0.08), 0 4px 12px -2px rgba(15, 23, 42, 0.03);
  --shadow-glow: 0 0 25px rgba(2, 132, 199, 0.16);
  --shadow-pop: 0 20px 40px -10px rgba(15, 23, 42, 0.12);

  /* 容器与圆角 */
  --max-width: 1220px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 26px;
  --radius-pill: 9999px;

  /* 动画缓动 */
  --transition: all 0.28s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--text-primary);
  background-color: var(--bg-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  background: 
    radial-gradient(circle at 10% 8%, rgba(224, 242, 254, 0.5) 0%, transparent 40%),
    radial-gradient(circle at 90% 25%, rgba(241, 245, 249, 0.85) 0%, transparent 45%),
    radial-gradient(circle at 50% 85%, rgba(224, 242, 254, 0.35) 0%, transparent 50%),
    var(--bg-main);
}

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

img, svg {
  vertical-align: middle;
  max-width: 100%;
}

ul {
  list-style: none;
}

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

/* ==========================================================================
   导航栏 Header（含移动端汉堡切换导航目录）
   ========================================================================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 900;
  background: var(--bg-glass);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--border-light);
  transition: var(--transition);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

/* 品牌 Logo 互动区 */
.brand-logo {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
  user-select: none;
  transition: transform 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.brand-logo:hover {
  transform: translateY(-2px) scale(1.02);
}

.brand-logo:active {
  transform: scale(0.95);
}

.logo-icon-wrap {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, #FFFFFF 0%, #E0F2FE 100%);
  border: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  position: relative;
}

.brand-logo:hover .logo-icon-wrap {
  border-color: var(--accent-primary);
  box-shadow: var(--shadow-glow);
}

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

.brand-name {
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -0.5px;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 6px;
}

.brand-badge {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  background: var(--honey-light);
  color: var(--honey-frost);
  padding: 2px 6px;
  border-radius: 4px;
  letter-spacing: 0.5px;
  border: 1px solid rgba(217, 119, 6, 0.2);
}

.brand-slogan {
  font-size: 11px;
  color: var(--text-muted);
  letter-spacing: 0.8px;
  text-transform: uppercase;
  font-weight: 600;
}

/* 桌面导航目录 */
.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-link {
  font-size: 14.5px;
  font-weight: 600;
  color: var(--text-secondary);
  position: relative;
  padding: 6px 2px;
}

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

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

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

.nav-cta {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* 移动端菜单切换汉堡按钮 */
.menu-toggle-btn {
  display: none;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: #FFFFFF;
  border: 1px solid var(--border-light);
  color: var(--text-primary);
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
}

.menu-toggle-btn:hover {
  background: var(--bg-subtle);
  border-color: var(--border-focus);
}

/* 移动端展开目录抽屉面板 */
.mobile-nav-drawer {
  display: none;
  position: fixed;
  top: 72px;
  left: 0;
  right: 0;
  background: #FFFFFF;
  border-bottom: 1px solid var(--border-light);
  padding: 20px 24px;
  box-shadow: var(--shadow-lg);
  flex-direction: column;
  gap: 16px;
  z-index: 899;
}

.mobile-nav-drawer.open {
  display: flex;
}

.mobile-nav-link {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  padding: 10px 0;
  border-bottom: 1px solid #F1F5F9;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.mobile-nav-link:hover {
  color: var(--accent-primary);
}

/* ==========================================================================
   按钮规范 (Button System)
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-pill);
  cursor: pointer;
  white-space: nowrap;
  transition: var(--transition);
  border: 1px solid transparent;
  min-height: 46px; /* 触控手指友好 */
  user-select: none;
}

.btn-primary {
  background: linear-gradient(135deg, #0F172A 0%, #1E293B 100%);
  color: #FFFFFF;
  box-shadow: 0 4px 14px rgba(15, 23, 42, 0.2);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #1E293B 0%, #334155 100%);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(15, 23, 42, 0.28);
}

.btn-primary:active {
  transform: translateY(0) scale(0.98);
}

.btn-accent {
  background: linear-gradient(135deg, #0284C7 0%, #0369A1 100%);
  color: #FFFFFF;
  box-shadow: 0 4px 16px rgba(2, 132, 199, 0.3);
}

.btn-accent:hover {
  background: linear-gradient(135deg, #0369A1 0%, #075985 100%);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(2, 132, 199, 0.4);
}

.btn-outline {
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
}

.btn-outline:hover {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
  background: #FFFFFF;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* ==========================================================================
   页面独立章节 (Sections)
   ========================================================================== */
.page-section {
  padding: 100px 0;
  position: relative;
  scroll-margin-top: 80px;
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 56px;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  padding: 6px 14px;
  background: var(--accent-light);
  color: var(--accent-primary);
  border-radius: var(--radius-pill);
  margin-bottom: 16px;
  border: 1px solid rgba(2, 132, 199, 0.2);
}

.section-title {
  font-size: 38px;
  font-weight: 800;
  line-height: 1.25;
  color: var(--text-primary);
  letter-spacing: -0.8px;
  margin-bottom: 16px;
}

.section-desc {
  font-size: 16.5px;
  color: var(--text-secondary);
  line-height: 1.75;
}

/* ==========================================================================
   1. 主视觉区 (Hero Section) - 左右分栏与动态图卡
   ========================================================================== */
.hero-section {
  padding-top: 140px;
  padding-bottom: 90px;
  position: relative;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.95fr;
  gap: 48px;
  align-items: center;
}

/* 左侧：标题、简介、CTA */
.hero-left {
  text-align: left;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: #FFFFFF;
  border: 1px solid var(--border-light);
  padding: 6px 18px 6px 8px;
  border-radius: var(--radius-pill);
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  box-shadow: var(--shadow-sm);
  margin-bottom: 24px;
  transition: var(--transition);
}

.hero-pill:hover {
  border-color: var(--border-focus);
  box-shadow: var(--shadow-md);
}

.hero-pill-badge {
  background: #10B981;
  color: #FFFFFF;
  font-size: 11px;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: var(--radius-pill);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.hero-pill-badge::before {
  content: "";
  width: 6px;
  height: 6px;
  background-color: #FFFFFF;
  border-radius: 50%;
  animation: pulse-dot 1.8s infinite;
}

@keyframes pulse-dot {
  0% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(1.35); }
  100% { opacity: 1; transform: scale(1); }
}

.hero-title {
  font-size: 50px;
  font-weight: 900;
  letter-spacing: -1.4px;
  line-height: 1.18;
  color: var(--text-primary);
  margin-bottom: 22px;
}

.hero-brand-name {
  color: var(--accent-primary);
  display: inline-block;
  position: relative;
}

.hero-brand-name::after {
  content: "";
  position: absolute;
  bottom: 4px;
  left: 0;
  right: 0;
  height: 8px;
  background: rgba(2, 132, 199, 0.15);
  border-radius: 4px;
  z-index: -1;
}

.hero-title-highlight {
  background: linear-gradient(135deg, #0F172A 0%, #334155 60%, #0284C7 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 18px;
  line-height: 1.72;
  color: var(--text-secondary);
  margin-bottom: 34px;
  max-width: 600px;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 40px;
}

.hero-cta-group .btn {
  padding: 14px 32px;
  font-size: 16px;
}

.hero-trust-metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.metric-item {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 16px 14px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.metric-item:hover {
  transform: translateY(-3px);
  border-color: var(--border-focus);
  box-shadow: var(--shadow-md);
}

.metric-value {
  font-size: 24px;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.5px;
}

.metric-label {
  font-size: 12.5px;
  color: var(--text-muted);
  margin-top: 4px;
  font-weight: 500;
}

/* ==========================================================================
   Hero 右侧：动态图卡与网络雷达控制台 (BeeFast Dynamic Hub)
   ========================================================================== */
.hero-right {
  position: relative;
  display: flex;
  justify-content: center;
}

.hub-card {
  width: 100%;
  max-width: 480px;
  background: #FFFFFF;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  padding: 28px 24px;
  box-shadow: var(--shadow-pop);
  position: relative;
  z-index: 2;
  overflow: hidden;
}

/* 顶部高光冷白微光带 */
.hub-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, #0284C7, #38BDF8, #60A5FA);
}

/* 控制台顶部信息条 */
.hub-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--border-light);
  margin-bottom: 20px;
}

.hub-status-group {
  display: flex;
  align-items: center;
  gap: 10px;
}

.hub-pulse-beacon {
  width: 12px;
  height: 12px;
  background: #10B981;
  border-radius: 50%;
  position: relative;
}

.hub-pulse-beacon::after {
  content: "";
  position: absolute;
  top: -4px;
  left: -4px;
  right: -4px;
  bottom: -4px;
  border: 2px solid #10B981;
  border-radius: 50%;
  animation: beacon-ring 2s infinite cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

@keyframes beacon-ring {
  0% { transform: scale(0.6); opacity: 1; }
  100% { transform: scale(2.2); opacity: 0; }
}

.hub-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
}

.hub-tag {
  font-size: 11px;
  font-weight: 700;
  color: #0284C7;
  background: #E0F2FE;
  padding: 3px 8px;
  border-radius: 4px;
  letter-spacing: 0.5px;
}

/* 核心动态雷达与波形展示区 */
.hub-radar-box {
  background: linear-gradient(180deg, #F8FAFC 0%, #F1F5F9 100%);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 22px 20px;
  text-align: center;
  position: relative;
  margin-bottom: 20px;
  overflow: hidden;
}

.radar-scan-circle {
  width: 130px;
  height: 130px;
  margin: 0 auto 16px;
  border-radius: 50%;
  border: 2px dashed rgba(2, 132, 199, 0.3);
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  background: radial-gradient(circle, rgba(224, 242, 254, 0.6) 0%, transparent 70%);
}

.radar-scan-beam {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  border-radius: 50%;
  border-top: 2px solid #0284C7;
  animation: radar-spin 3.2s linear infinite;
}

@keyframes radar-spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.radar-center-logo {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: #FFFFFF;
  border: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 12px rgba(2, 132, 199, 0.2);
}

.hub-live-metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  padding-top: 14px;
  border-top: 1px dashed var(--border-light);
}

.live-metric-col {
  display: flex;
  flex-direction: column;
}

.live-metric-val {
  font-size: 18px;
  font-weight: 800;
  color: var(--text-primary);
}

.live-metric-val.green {
  color: #059669;
}

.live-metric-name {
  font-size: 11px;
  color: var(--text-muted);
  font-weight: 600;
  text-transform: uppercase;
  margin-top: 2px;
}

/* 动态节点列表 */
.hub-node-stream {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.hub-node-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  background: #FFFFFF;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.hub-node-row:hover {
  border-color: var(--accent-primary);
  transform: translateX(4px);
  box-shadow: var(--shadow-sm);
}

.hub-node-left {
  display: flex;
  align-items: center;
  gap: 10px;
}

.node-flag-icon {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: #F1F5F9;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 700;
  border: 1px solid var(--border-light);
}

.node-title-box {
  display: flex;
  flex-direction: column;
}

.node-name {
  font-size: 13.5px;
  font-weight: 700;
  color: var(--text-primary);
}

.node-protocol {
  font-size: 11px;
  color: var(--text-muted);
}

.hub-node-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

.node-ping {
  font-size: 12px;
  font-weight: 700;
  color: #10B981;
}

.node-signal-bars {
  display: flex;
  align-items: flex-end;
  gap: 2px;
  height: 12px;
}

.signal-bar {
  width: 3px;
  background: #10B981;
  border-radius: 1px;
}

.signal-bar:nth-child(1) { height: 4px; }
.signal-bar:nth-child(2) { height: 7px; }
.signal-bar:nth-child(3) { height: 10px; }
.signal-bar:nth-child(4) { height: 12px; }

/* 浮动装饰微图卡（悬浮在面板侧边） */
.hub-floating-badge {
  position: absolute;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-md);
  padding: 10px 14px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  gap: 10px;
  z-index: 3;
  animation: float-badge 3.6s ease-in-out infinite alternate;
}

.badge-top-right {
  top: -16px;
  right: -20px;
}

.badge-bottom-left {
  bottom: -18px;
  left: -20px;
  animation-delay: 1.8s;
}

@keyframes float-badge {
  0% { transform: translateY(0); }
  100% { transform: translateY(-8px); }
}

.float-badge-icon {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: #EFF6FF;
  display: flex;
  align-items: center;
  justify-content: center;
}

.float-badge-title {
  font-size: 12px;
  font-weight: 700;
  color: var(--text-primary);
}

.float-badge-desc {
  font-size: 11px;
  color: #10B981;
  font-weight: 600;
}

/* ==========================================================================
   2. 产品核心优势 (Features - 3大图文卡片细节增强)
   ========================================================================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 38px 32px;
  position: relative;
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.feature-card::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--accent-primary), transparent);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.feature-card:hover {
  transform: translateY(-6px);
  border-color: var(--accent-primary);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.feature-card:hover::after {
  opacity: 1;
}

.feature-icon-wrapper {
  width: 62px;
  height: 62px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, #FFFFFF 0%, var(--accent-light) 100%);
  border: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-primary);
  margin-bottom: 26px;
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
}

.feature-card:hover .feature-icon-wrapper {
  background: var(--accent-primary);
  color: #FFFFFF;
  border-color: var(--accent-primary);
  transform: scale(1.08) rotate(3deg);
  box-shadow: 0 6px 16px rgba(2, 132, 199, 0.35);
}

.feature-title {
  font-size: 21px;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.feature-desc {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 22px;
  flex-grow: 1;
}

.feature-list {
  border-top: 1px solid var(--border-light);
  padding-top: 18px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.feature-list-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--text-secondary);
}

.feature-check-icon {
  width: 17px;
  height: 17px;
  color: #10B981;
  flex-shrink: 0;
}

/* ==========================================================================
   3. 流媒体与 AI 支持图卡 (细节升级：真实品牌高精 SVG 图标)
   ========================================================================== */
.media-ai-container {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.media-ai-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 38px 34px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.media-ai-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, #0284C7, #38BDF8);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.media-ai-card:hover::before {
  opacity: 1;
}

.media-ai-card:hover {
  transform: translateY(-5px);
  border-color: var(--border-focus);
  box-shadow: var(--shadow-lg);
}

.media-ai-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  font-weight: 700;
  color: var(--accent-primary);
  background: var(--accent-light);
  padding: 5px 12px;
  border-radius: var(--radius-pill);
  margin-bottom: 18px;
  border: 1px solid rgba(2, 132, 199, 0.15);
}

.media-ai-title {
  font-size: 24px;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.media-ai-desc {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.68;
  margin-bottom: 24px;
}

.service-chip-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

.service-chip {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 13px 15px;
  background: #F8FAFC;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  transition: var(--transition);
}

.service-chip:hover {
  background: #FFFFFF;
  border-color: var(--border-focus);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.service-chip-info {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* 品牌图标专用包装盒 */
.brand-icon-box {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: #FFFFFF;
  border: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}

.service-name {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-primary);
}

.service-spec {
  font-size: 11.5px;
  color: var(--text-muted);
}

.service-status {
  font-size: 11.5px;
  font-weight: 700;
  color: #10B981;
  display: flex;
  align-items: center;
  gap: 5px;
  background: #ECFDF5;
  padding: 3px 8px;
  border-radius: var(--radius-pill);
}

.status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #10B981;
}

/* ==========================================================================
   4. 套餐价格对比表 (参考网上真实机场套餐定价)
   ========================================================================== */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  padding: 40px 32px;
  position: relative;
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
}

.pricing-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-focus);
  box-shadow: var(--shadow-lg);
}

/* 推荐热门套餐样式（爆款 IEPL） */
.pricing-card.featured {
  background: #FFFFFF;
  border: 2px solid var(--accent-primary);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  transform: scale(1.02);
}

.pricing-card.featured:hover {
  transform: scale(1.04) translateY(-6px);
}

.pricing-ribbon {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, #0284C7 0%, #0369A1 100%);
  color: #FFFFFF;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.6px;
  padding: 5px 18px;
  border-radius: var(--radius-pill);
  box-shadow: 0 4px 12px rgba(2, 132, 199, 0.4);
  text-transform: uppercase;
  white-space: nowrap;
}

.pricing-header {
  margin-bottom: 22px;
}

.pricing-name {
  font-size: 22px;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.pricing-tagline {
  font-size: 13.5px;
  color: var(--text-muted);
}

.pricing-amount-box {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 8px;
}

.pricing-currency {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-primary);
}

.pricing-price {
  font-size: 46px;
  font-weight: 900;
  color: var(--text-primary);
  letter-spacing: -1.2px;
}

.pricing-cycle {
  font-size: 14.5px;
  color: var(--text-muted);
  font-weight: 500;
}

.pricing-sub-deal {
  font-size: 12px;
  color: var(--honey-frost);
  background: var(--honey-light);
  padding: 3px 8px;
  border-radius: 4px;
  display: inline-block;
  margin-bottom: 24px;
  font-weight: 600;
  border: 1px solid rgba(217, 119, 6, 0.2);
}

.pricing-features {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 32px;
  padding-top: 18px;
  border-top: 1px solid var(--border-light);
  flex-grow: 1;
}

.pricing-feature-row {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 14px;
  color: var(--text-secondary);
}

.pricing-feature-row.muted {
  color: var(--text-light);
  text-decoration: line-through;
}

.pricing-icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.pricing-card .btn {
  width: 100%;
}

/* ==========================================================================
   4.2 精选文章图卡专栏 (Articles Showcase - 放置于价格板块下方)
   ========================================================================== */
.articles-section {
  padding-top: 20px;
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.article-card-item {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 26px 24px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

.article-card-item::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--accent-primary);
  opacity: 0;
  transition: opacity 0.25s ease;
}

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

.article-card-item:hover::before {
  opacity: 1;
}

.article-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

.article-cat-tag {
  font-size: 11.5px;
  font-weight: 700;
  color: var(--accent-primary);
  background: var(--accent-light);
  padding: 3px 10px;
  border-radius: var(--radius-pill);
}

.article-card-date {
  font-size: 11.5px;
  color: var(--text-light);
}

.article-card-title {
  font-size: 16.5px;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.45;
  margin-bottom: 12px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

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

.article-card-desc {
  font-size: 13.5px;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 20px;
  flex-grow: 1;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 14px;
  border-top: 1px dashed var(--border-light);
  font-size: 12.5px;
}

.article-read-btn {
  font-weight: 700;
  color: var(--accent-primary);
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: transform 0.2s ease;
}

.article-card-item:hover .article-read-btn {
  transform: translateX(4px);
}

.article-read-time {
  color: var(--text-muted);
}

/* 展开更多文章控制条 */
.articles-more-wrap {
  text-align: center;
  margin-top: 40px;
}

/* ==========================================================================
   5. 用户评价 (Reviews)
   ========================================================================== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 30px 26px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

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

.review-stars {
  display: flex;
  gap: 4px;
  color: #F59E0B;
  margin-bottom: 14px;
  font-size: 15px;
}

.review-comment {
  font-size: 14.5px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 22px;
  flex-grow: 1;
  font-style: italic;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 12px;
  border-top: 1px solid var(--border-light);
  padding-top: 16px;
}

.author-avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: linear-gradient(135deg, #E2E8F0 0%, #CBD5E1 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: var(--text-primary);
  font-size: 14px;
}

.author-name {
  font-size: 14.5px;
  font-weight: 700;
  color: var(--text-primary);
}

.author-role {
  font-size: 12px;
  color: var(--text-muted);
}

/* ==========================================================================
   6. 常见问题解答 (FAQ)
   ========================================================================== */
.faq-accordion {
  max-width: 840px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition);
}

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

.faq-summary {
  padding: 20px 24px;
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
  list-style: none;
}

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

.faq-arrow {
  width: 18px;
  height: 18px;
  color: var(--text-muted);
  transition: transform 0.28s ease;
  flex-shrink: 0;
}

.faq-item[open] .faq-arrow {
  transform: rotate(180deg);
  color: var(--accent-primary);
}

.faq-item[open] {
  border-color: var(--border-accent);
  box-shadow: var(--shadow-sm);
}

.faq-content {
  padding: 0 24px 22px 24px;
  font-size: 14.8px;
  color: var(--text-secondary);
  line-height: 1.72;
  border-top: 1px dashed var(--border-light);
  margin-top: -4px;
  padding-top: 16px;
}

/* ==========================================================================
   7. 页脚 Footer（严格只保留4个标题链接，在新页面打开）
   ========================================================================== */
.site-footer {
  background: #FFFFFF;
  border-top: 1px solid var(--border-light);
  padding: 60px 0 40px;
  text-align: center;
}

.footer-brand-wrap {
  margin-bottom: 26px;
}

.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}

.footer-brand-title {
  font-size: 18px;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.3px;
}

.footer-brand-desc {
  font-size: 13.5px;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto;
}

.footer-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 36px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.footer-link {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-secondary);
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.footer-link:hover {
  color: var(--accent-primary);
  background: var(--bg-main);
}

.footer-trust-badges {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 26px;
}

.trust-badge-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
  background: #F8FAFC;
  padding: 5px 13px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border-light);
  transition: var(--transition);
}

.trust-badge-item:hover {
  border-color: var(--border-focus);
  background: #FFFFFF;
}

.footer-divider {
  width: 60px;
  height: 2px;
  background: var(--border-light);
  margin: 0 auto 24px;
}

.footer-copy {
  font-size: 13.5px;
  color: var(--text-muted);
}

/* 友情链接与主博客矩阵 PBN 外链样式 */
.footer-pbn-links {
  margin-top: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
  font-size: 13px;
}

.footer-pbn-label {
  color: var(--text-muted);
  font-weight: 600;
}

.footer-pbn-link {
  color: var(--accent-primary);
  font-weight: 600;
  text-decoration: none;
  transition: var(--transition);
}

.footer-pbn-link:hover {
  color: var(--accent-hover);
  text-decoration: underline;
}

.footer-pbn-sep {
  color: var(--border-light);
  font-size: 12px;
}

/* ==========================================================================
   右侧悬浮章节上下移动控制器 (Section Floating Navigator)
   ========================================================================== */
.section-nav-ctrl {
  position: fixed;
  right: 24px;
  top: 50%;
  transform: translateY(-50%);
  z-index: 999;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  background: var(--bg-glass);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  padding: 10px 8px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-md);
  user-select: none;
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.ctrl-btn {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: #FFFFFF;
  border: 1px solid var(--border-light);
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
  box-shadow: var(--shadow-sm);
}

.ctrl-btn:hover {
  background: var(--accent-light);
  border-color: var(--accent-primary);
  color: var(--accent-primary);
  transform: scale(1.12);
}

.ctrl-btn:active {
  transform: scale(0.9);
}

.ctrl-dots-wrap {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 6px 0;
}

.ctrl-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #CBD5E1;
  cursor: pointer;
  transition: var(--transition);
  position: relative;
}

.ctrl-dot:hover {
  background: var(--accent-primary);
  transform: scale(1.3);
}

.ctrl-dot.active {
  background: var(--accent-primary);
  transform: scale(1.4);
  box-shadow: 0 0 8px rgba(2, 132, 199, 0.5);
}

.ctrl-dot::after {
  content: attr(data-label);
  position: absolute;
  right: 22px;
  top: 50%;
  transform: translateY(-50%) scale(0.8);
  opacity: 0;
  pointer-events: none;
  background: #0F172A;
  color: #FFFFFF;
  font-size: 11px;
  font-weight: 600;
  white-space: nowrap;
  padding: 4px 8px;
  border-radius: 4px;
  transition: all 0.2s ease;
  box-shadow: var(--shadow-sm);
}

.ctrl-dot:hover::after {
  opacity: 1;
  transform: translateY(-50%) scale(1);
}

/* ==========================================================================
   内部单页样式 (About, Terms, Privacy, Sitemap)
   ========================================================================== */
.article-page {
  padding-top: 120px;
  padding-bottom: 80px;
}

.article-box {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  padding: 50px 48px;
  box-shadow: var(--shadow-md);
  max-width: 900px;
  margin: 0 auto;
}

.article-header {
  border-bottom: 1px solid var(--border-light);
  padding-bottom: 24px;
  margin-bottom: 32px;
}

.article-title {
  font-size: 32px;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.article-meta {
  font-size: 13.5px;
  color: var(--text-muted);
}

.article-body {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.8;
}

.article-body h2 {
  font-size: 20px;
  font-weight: 800;
  color: var(--text-primary);
  margin: 32px 0 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.article-body ul {
  list-style: disc;
  padding-left: 24px;
  margin-bottom: 20px;
}

.article-body li {
  margin-bottom: 8px;
}

.article-body .callout {
  background: var(--accent-light);
  border-left: 4px solid var(--accent-primary);
  padding: 16px 20px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 24px 0;
  color: var(--text-primary);
  font-size: 14.5px;
}

.article-body .callout-alert {
  background: #FEF2F2;
  border-left: 4px solid #EF4444;
  color: #991B1B;
}

.article-actions {
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

/* ==========================================================================
   响应式媒体查询 (@media - 移动端完美单栏适配)
   ========================================================================== */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

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

  .hero-subtitle {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-cta-group {
    justify-content: center;
  }

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

  .pricing-card.featured {
    transform: none;
  }

  .pricing-card.featured:hover {
    transform: translateY(-6px);
  }
}

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

  .header-inner {
    height: 64px;
  }

  .nav-links {
    display: none;
  }

  .menu-toggle-btn {
    display: flex;
  }

  .page-section {
    padding: 70px 0;
  }

  .hero-section {
    padding-top: 100px;
    padding-bottom: 60px;
  }

  .hero-title {
    font-size: 34px;
    letter-spacing: -0.8px;
  }

  .hero-subtitle {
    font-size: 15px;
    margin-bottom: 28px;
  }

  .hero-cta-group {
    flex-direction: column;
    width: 100%;
    gap: 12px;
  }

  .hero-cta-group .btn {
    width: 100%;
  }

  .hero-trust-metrics {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .features-grid,
  .media-ai-container,
  .pricing-grid,
  .reviews-grid,
  .articles-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .service-chip-grid {
    grid-template-columns: 1fr;
  }

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

  .article-box {
    padding: 30px 20px;
  }

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

  /* 移动端悬浮箭头控制器适配 */
  .section-nav-ctrl {
    right: 12px;
    padding: 6px 4px;
    background: rgba(255, 255, 255, 0.94);
  }

  .ctrl-btn {
    width: 34px;
    height: 34px;
  }

  .ctrl-dots-wrap {
    display: none;
  }

  .footer-nav {
    flex-direction: column;
    gap: 16px;
  }

  .badge-top-right,
  .badge-bottom-left {
    display: none;
  }
}