/* ==========================================================================
   哆啦 A 梦 (duolaamengvpn.homes) - Aerodynamic Hopter-Flight UI Design
   色调：开阔平流层天蓝 (#00a3e0)、云朵绒毛白 (#ffffff)、旋翼黄铜金 (#eab308)
   特性：高空轻羽悬浮翼板、旋翼动力学滑流微交互、纯原生 CSS、零重型框架、极速秒开
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. 调色盘与全局变量
   -------------------------------------------------------------------------- */
:root {
  /* 白天模式 (默认)：清风蓝天高空视觉 */
  --sky-stratosphere: #00a3e0;
  --sky-stratosphere-hover: #028ac0;
  --sky-light: #e0f2fe;
  --sky-breeze: #f0f9ff;
  --cloud-fleece: #ffffff;
  --cloud-subtle: #f8fafc;
  --rotor-gold: #eab308;
  --rotor-gold-hover: #ca8a04;
  --rotor-brass: #d97706;

  --bg-sky: #f0f9ff;
  --bg-card: rgba(255, 255, 255, 0.88);
  --bg-card-hover: rgba(255, 255, 255, 0.98);
  --bg-glass: rgba(255, 255, 255, 0.82);

  --text-main: #0c4a6e;
  --text-body: #334155;
  --text-muted: #64748b;
  --text-light: #ffffff;

  --border-aerodynamic: rgba(0, 163, 224, 0.16);
  --border-aerodynamic-hover: rgba(0, 163, 224, 0.42);
  --border-gold: rgba(234, 179, 8, 0.35);

  --shadow-cloud: 0 10px 30px -5px rgba(0, 163, 224, 0.08), 0 4px 12px rgba(12, 74, 110, 0.04);
  --shadow-winglet: 0 16px 40px -8px rgba(0, 163, 224, 0.16), 0 0 1px rgba(0, 163, 224, 0.2);
  --shadow-rotor: 0 6px 20px rgba(234, 179, 8, 0.32);

  --radius-winglet: 22px;
  --radius-pill: 9999px;
  --radius-sm: 10px;

  --ease-aerodynamic: cubic-bezier(0.16, 1, 0.3, 1);
  --transition-wind: all 0.35s var(--ease-aerodynamic);
}

/* --------------------------------------------------------------------------
   夜间平流层暗夜模式 (Night Stratosphere Mode)
   -------------------------------------------------------------------------- */
[data-theme="dark"] {
  --sky-stratosphere: #38bdf8;
  --sky-stratosphere-hover: #0ea5e9;
  --sky-light: #1e293b;
  --sky-breeze: #0c1222;
  --cloud-fleece: #111a2e;
  --cloud-subtle: #0f172a;
  --rotor-gold: #facc15;
  --rotor-gold-hover: #eab308;
  --rotor-brass: #fbbf24;

  --bg-sky: #080d1a;
  --bg-card: rgba(17, 26, 46, 0.85);
  --bg-card-hover: rgba(22, 34, 61, 0.95);
  --bg-glass: rgba(12, 18, 34, 0.85);

  --text-main: #f0f9ff;
  --text-body: #cbd5e1;
  --text-muted: #94a3b8;
  --text-light: #080d1a;

  --border-aerodynamic: rgba(56, 189, 248, 0.2);
  --border-aerodynamic-hover: rgba(56, 189, 248, 0.5);
  --border-gold: rgba(250, 204, 21, 0.4);

  --shadow-cloud: 0 10px 30px -5px rgba(0, 0, 0, 0.5);
  --shadow-winglet: 0 16px 40px -8px rgba(0, 0, 0, 0.7), 0 0 1px rgba(56, 189, 248, 0.3);
  --shadow-rotor: 0 6px 20px rgba(250, 204, 21, 0.25);
}

/* --------------------------------------------------------------------------
   2. 基础重置与平滑滚动
   -------------------------------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-sky);
  color: var(--text-body);
  line-height: 1.65;
  position: relative;
  overflow-x: hidden;
  transition: background-color 0.4s var(--ease-aerodynamic), color 0.4s var(--ease-aerodynamic);
}

/* 动态背景高空卷云地貌层次 (Multi-plane Atmospheric Cloud Carpet) */
.atmospheric-sky-bg {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: -2;
  pointer-events: none;
  background: radial-gradient(circle at 50% 15%, rgba(0, 163, 224, 0.12) 0%, rgba(240, 249, 255, 0) 70%),
              radial-gradient(circle at 85% 65%, rgba(234, 179, 8, 0.05) 0%, rgba(240, 249, 255, 0) 50%);
  transition: var(--transition-wind);
}

[data-theme="dark"] .atmospheric-sky-bg {
  background: radial-gradient(circle at 50% 15%, rgba(56, 189, 248, 0.14) 0%, rgba(8, 13, 26, 0) 70%),
              radial-gradient(circle at 85% 65%, rgba(250, 204, 21, 0.06) 0%, rgba(8, 13, 26, 0) 50%);
}

.cloud-carpet-layer {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  pointer-events: none;
  opacity: 0.65;
  transform: translateY(0px);
  will-change: transform;
}

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

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

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  outline: none;
  background: none;
}

.container {
  width: 100%;
  max-width: 1220px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

/* --------------------------------------------------------------------------
   3. 页眉航行顶栏 (High-Altitude Flight Deck Header)
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-aerodynamic);
  transition: var(--transition-wind);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 74px;
  gap: 16px;
}

/* 品牌 Logo 与 Doraemon 形象图标 */
.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-main);
  flex-shrink: 0;
}

.brand-logo-img {
  width: 44px;
  height: 44px;
  object-fit: contain;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.95);
  padding: 3px;
  border: 1px solid var(--border-aerodynamic);
  box-shadow: 0 4px 14px rgba(0, 163, 224, 0.22);
  transition: var(--transition-wind);
}

.brand-logo:hover .brand-logo-img {
  transform: scale(1.08) rotate(-3deg);
  box-shadow: 0 6px 18px rgba(0, 163, 224, 0.35);
}

.brand-icon-hopter {
  width: 42px;
  height: 42px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--sky-stratosphere) 0%, #0284c7 100%);
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(0, 163, 224, 0.35);
  position: relative;
  overflow: visible;
}

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

.brand-badge {
  font-size: 0.72rem;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: var(--radius-pill);
  background: rgba(0, 163, 224, 0.1);
  color: var(--sky-stratosphere);
  border: 1px solid var(--border-aerodynamic);
  margin-left: 4px;
}

/* 导航目录 (首页 + 核心优势 + 流媒体解锁 + AI专线 + 套餐价格 + 用户评价 + 常见问题 + 推荐资讯) */
.nav-links {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.nav-link {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-body);
  position: relative;
  padding: 7px 12px;
  border-radius: var(--radius-pill);
  transition: var(--transition-wind);
  white-space: nowrap; /* 绝对禁止文字换行折断 */
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.nav-link:hover,
.nav-link.active {
  color: var(--sky-stratosphere);
  background: rgba(0, 163, 224, 0.08);
}

/* 推荐资讯特殊气动标签 */
.nav-link-dispatch {
  color: var(--rotor-brass);
  background: rgba(234, 179, 8, 0.1);
  border: 1px solid var(--border-gold);
  white-space: nowrap;
}

.nav-link-dispatch:hover {
  background: rgba(234, 179, 8, 0.2);
  color: var(--rotor-gold-hover);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

/* 昼夜模式切换按钮：透明磨砂玻璃质感、微光边框、平滑过渡 */
.theme-toggle-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: var(--radius-pill);
  background: var(--bg-card);
  border: 1px solid var(--border-aerodynamic);
  color: var(--text-body);
  box-shadow: 0 2px 8px rgba(0, 163, 224, 0.08);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: var(--transition-wind);
}

.theme-toggle-btn:hover {
  color: var(--sky-stratosphere);
  border-color: var(--sky-stratosphere);
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(0, 163, 224, 0.2);
}

.theme-toggle-btn svg {
  width: 20px;
  height: 20px;
}

.icon-sun {
  display: none;
}
.icon-moon {
  display: block;
}

[data-theme="dark"] .icon-sun {
  display: block;
  color: var(--rotor-gold);
}
[data-theme="dark"] .icon-moon {
  display: none;
}

/* 呼吁操作按钮 (CTA) */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 0.95rem;
  font-weight: 700;
  padding: 11px 24px;
  border-radius: var(--radius-pill);
  transition: var(--transition-wind);
  white-space: nowrap;
  letter-spacing: 0.01em;
}

.btn-primary {
  background: linear-gradient(135deg, var(--sky-stratosphere) 0%, #0284c7 100%);
  color: #ffffff;
  box-shadow: 0 4px 18px rgba(0, 163, 224, 0.35);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.btn-primary:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 8px 26px rgba(0, 163, 224, 0.45);
  color: #ffffff;
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-main);
  border: 1px solid var(--border-aerodynamic);
  box-shadow: var(--shadow-cloud);
}

.btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--sky-stratosphere);
  color: var(--sky-stratosphere);
  transform: translateY(-2px);
}

.btn-gold {
  background: linear-gradient(135deg, var(--rotor-gold) 0%, var(--rotor-brass) 100%);
  color: #ffffff;
  box-shadow: var(--shadow-rotor);
}

.btn-gold:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 8px 24px rgba(234, 179, 8, 0.45);
  color: #ffffff;
}

.btn-lg {
  padding: 14px 34px;
  font-size: 1.05rem;
}

.btn-full {
  width: 100%;
}

.mobile-menu-btn {
  display: none;
  width: 42px;
  height: 42px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-aerodynamic);
  color: var(--text-main);
}

/* --------------------------------------------------------------------------
   4. 主视觉区 (Hero Section) & 双叶竹蜻蜓动态旋翼微交互
   -------------------------------------------------------------------------- */
.hero-section {
  padding: 85px 0 75px;
  position: relative;
}

.hero-flight-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
  gap: 40px;
}

.hero-badge-pill {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 18px;
  border-radius: var(--radius-pill);
  background: rgba(0, 163, 224, 0.08);
  border: 1px solid var(--border-aerodynamic);
  color: var(--sky-stratosphere);
  font-size: 0.88rem;
  font-weight: 700;
  margin-bottom: 24px;
}

.rotor-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--rotor-gold);
  box-shadow: 0 0 10px var(--rotor-gold);
  animation: pulse-rotor 2s infinite;
}

@keyframes pulse-rotor {
  0% { transform: scale(0.95); opacity: 0.7; }
  50% { transform: scale(1.3); opacity: 1; }
  100% { transform: scale(0.95); opacity: 0.7; }
}

/* 大标题包含当前品牌名 */
.hero-title {
  font-size: 3.4rem;
  font-weight: 900;
  line-height: 1.18;
  letter-spacing: -0.03em;
  color: var(--text-main);
  margin-bottom: 20px;
}

.hero-title .brand-highlight {
  color: var(--sky-stratosphere);
  position: relative;
  display: inline-block;
}

.hero-title .brand-highlight::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 6px;
  width: 100%;
  height: 10px;
  background: rgba(234, 179, 8, 0.22);
  z-index: -1;
  border-radius: 4px;
}

.hero-subtitle {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--sky-stratosphere);
  margin-bottom: 14px;
}

.hero-desc {
  font-size: 1.05rem;
  color: var(--text-body);
  line-height: 1.75;
  margin-bottom: 34px;
  max-width: 620px;
}

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

/* 互动式 3D 双叶竹蜻蜓旋翼机械结构 (Stylized Twin-Blade Rotor Mechanism) */
.rotor-stage-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  position: relative;
  padding: 40px 30px;
  background: var(--bg-card);
  border: 1px solid var(--border-aerodynamic);
  border-radius: var(--radius-winglet);
  box-shadow: var(--shadow-winglet);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  perspective: 1000px;
  transition: var(--transition-wind);
}

.rotor-stage-container:hover {
  border-color: var(--border-aerodynamic-hover);
}

.rotor-3d-box {
  width: 220px;
  height: 220px;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  transform-style: preserve-3d;
  transition: transform 0.2s ease-out;
}

/* 旋翼主体中心轴与黄铜旋翼叶片 */
.rotor-hub {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: radial-gradient(circle, #fef08a 0%, var(--rotor-gold) 60%, var(--rotor-brass) 100%);
  border: 2px solid #ffffff;
  box-shadow: 0 4px 14px rgba(234, 179, 8, 0.6);
  position: absolute;
  z-index: 5;
}

.rotor-twin-blades {
  position: absolute;
  width: 200px;
  height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
  animation: rotor-spin 2.4s linear infinite;
  transform-origin: center center;
  will-change: transform;
}

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

.blade {
  position: absolute;
  width: 90px;
  height: 18px;
  background: linear-gradient(90deg, var(--rotor-gold) 0%, rgba(234, 179, 8, 0.4) 85%, transparent 100%);
  border-radius: 20px 4px 4px 20px;
  box-shadow: 0 2px 8px rgba(234, 179, 8, 0.25);
  backdrop-filter: blur(2px);
}

.blade-left {
  left: 10px;
  transform: rotate(0deg);
}

.blade-right {
  right: 10px;
  transform: rotate(180deg);
}

/* 旋翼下方气流环 (Slipstream Aero Rings) */
.aero-slipstream-ring {
  position: absolute;
  border-radius: 50%;
  border: 1px dashed rgba(0, 163, 224, 0.3);
  pointer-events: none;
  animation: ring-expand 3s ease-out infinite;
}

.ring-1 {
  width: 140px;
  height: 140px;
  animation-delay: 0s;
}

.ring-2 {
  width: 200px;
  height: 200px;
  animation-delay: 1.5s;
}

@keyframes ring-expand {
  0% { transform: scale(0.7); opacity: 0.8; }
  100% { transform: scale(1.25); opacity: 0; }
}

.rotor-telemetry {
  margin-top: 24px;
  text-align: center;
  width: 100%;
}

.telemetry-title {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--rotor-brass);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 8px;
}

.telemetry-stats-row {
  display: flex;
  justify-content: space-around;
  padding: 12px 14px;
  background: var(--bg-sky);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-aerodynamic);
}

.telemetry-stat-item h4 {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--text-main);
}

.telemetry-stat-item p {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* --------------------------------------------------------------------------
   5. 通用区块 (Atmospheric Floating Winglets - 无笨重厚重分割线)
   -------------------------------------------------------------------------- */
.section-flight {
  padding: 95px 0 85px;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 55px;
}

.section-altitude-tag {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--sky-stratosphere);
  background: rgba(0, 163, 224, 0.08);
  padding: 4px 14px;
  border-radius: var(--radius-pill);
  margin-bottom: 14px;
  border: 1px solid var(--border-aerodynamic);
}

.section-title {
  font-size: 2.35rem;
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--text-main);
  margin-bottom: 16px;
}

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

/* --------------------------------------------------------------------------
   6. 核心优势介绍 (3个图文悬浮翼板卡片)
   -------------------------------------------------------------------------- */
.grid-winglets-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.winglet-card {
  background: var(--bg-card);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--border-aerodynamic);
  border-radius: var(--radius-winglet);
  padding: 38px 30px;
  transition: var(--transition-wind);
  box-shadow: var(--shadow-cloud);
  position: relative;
  overflow: hidden;
}

.winglet-card:hover {
  transform: translateY(-8px) scale(1.01);
  box-shadow: var(--shadow-winglet);
  border-color: var(--sky-stratosphere);
}

.winglet-icon-capsule {
  width: 58px;
  height: 58px;
  border-radius: var(--radius-sm);
  background: rgba(0, 163, 224, 0.1);
  border: 1px solid var(--border-aerodynamic);
  color: var(--sky-stratosphere);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 22px;
  transition: var(--transition-wind);
}

.winglet-card:hover .winglet-icon-capsule {
  background: var(--sky-stratosphere);
  color: #ffffff;
  transform: scale(1.08);
  box-shadow: 0 4px 16px rgba(0, 163, 224, 0.3);
}

.winglet-icon-capsule svg {
  width: 28px;
  height: 28px;
}

.winglet-title {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 12px;
}

.winglet-desc {
  font-size: 0.96rem;
  color: var(--text-body);
  line-height: 1.7;
  margin-bottom: 20px;
}

.winglet-pill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.winglet-pill {
  font-size: 0.78rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  background: var(--sky-breeze);
  color: var(--sky-stratosphere);
  border: 1px solid var(--border-aerodynamic);
}

/* --------------------------------------------------------------------------
   7. 流媒体与 AI 双图卡 (Aerodynamic Media & AI Showcase)
   -------------------------------------------------------------------------- */
.grid-winglets-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.showcase-winglet {
  background: var(--bg-card);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--border-aerodynamic);
  border-radius: var(--radius-winglet);
  padding: 42px 36px;
  box-shadow: var(--shadow-cloud);
  transition: var(--transition-wind);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.showcase-winglet:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-winglet);
}

.showcase-stream-card {
  border-left: 4px solid #ef4444;
}

.showcase-ai-card {
  border-left: 4px solid var(--sky-stratosphere);
}

.showcase-hopter-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  font-weight: 800;
  padding: 4px 14px;
  border-radius: var(--radius-pill);
  margin-bottom: 20px;
  width: fit-content;
}

.badge-stream-hopter {
  background: rgba(239, 68, 68, 0.1);
  color: #ef4444;
  border: 1px solid rgba(239, 68, 68, 0.25);
}

.badge-ai-hopter {
  background: rgba(0, 163, 224, 0.1);
  color: var(--sky-stratosphere);
  border: 1px solid var(--border-aerodynamic);
}

.showcase-title {
  font-size: 1.65rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 14px;
}

.showcase-desc {
  font-size: 0.98rem;
  color: var(--text-body);
  line-height: 1.7;
  margin-bottom: 26px;
}

.service-capsules-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-bottom: 28px;
}

.service-capsule {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 12px 8px;
  background: var(--sky-breeze);
  border: 1px solid var(--border-aerodynamic);
  border-radius: var(--radius-sm);
  text-align: center;
  transition: var(--transition-wind);
}

.service-capsule:hover {
  background: #ffffff;
  border-color: var(--sky-stratosphere);
  transform: translateY(-3px);
}

.service-capsule-icon {
  font-size: 1.25rem;
  font-weight: 900;
  margin-bottom: 4px;
}

.service-capsule-name {
  font-size: 0.76rem;
  font-weight: 700;
  color: var(--text-main);
  white-space: nowrap;
}

.showcase-checklist {
  list-style: none;
  margin-bottom: 30px;
}

.showcase-checklist li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.94rem;
  color: var(--text-body);
  margin-bottom: 12px;
}

.showcase-checklist svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  color: var(--sky-stratosphere);
}

/* --------------------------------------------------------------------------
   8. 套餐价格对比表 (参考网上真实机场/专线套餐真实价格)
   -------------------------------------------------------------------------- */
.pricing-deck-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  align-items: stretch;
}

.pricing-plan-winglet {
  background: var(--bg-card);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--border-aerodynamic);
  border-radius: var(--radius-winglet);
  padding: 40px 32px;
  position: relative;
  display: flex;
  flex-direction: column;
  transition: var(--transition-wind);
  box-shadow: var(--shadow-cloud);
}

.pricing-plan-winglet:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-winglet);
}

/* 热卖推荐卡片 */
.pricing-plan-winglet.featured-winglet {
  border: 2px solid var(--sky-stratosphere);
  box-shadow: 0 16px 48px -6px rgba(0, 163, 224, 0.28);
  transform: scale(1.02);
}

.pricing-plan-winglet.featured-winglet:hover {
  transform: scale(1.02) translateY(-8px);
}

.featured-rotor-ribbon {
  position: absolute;
  top: -15px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, var(--rotor-gold) 0%, var(--rotor-brass) 100%);
  color: #ffffff;
  font-size: 0.8rem;
  font-weight: 800;
  padding: 4px 18px;
  border-radius: var(--radius-pill);
  box-shadow: var(--shadow-rotor);
  white-space: nowrap;
  letter-spacing: 0.04em;
}

.plan-title {
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 8px;
}

.plan-tagline {
  font-size: 0.88rem;
  color: var(--text-muted);
  min-height: 42px;
  margin-bottom: 24px;
}

.plan-cost-box {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin-bottom: 24px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-aerodynamic);
}

.plan-currency {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-main);
}

.plan-figure {
  font-size: 3rem;
  font-weight: 900;
  line-height: 1;
  color: var(--text-main);
}

.plan-tenure {
  font-size: 0.92rem;
  color: var(--text-muted);
}

.plan-per-month {
  font-size: 0.82rem;
  color: var(--rotor-brass);
  font-weight: 700;
  margin-left: 4px;
}

.plan-specs {
  list-style: none;
  margin-bottom: 34px;
  flex-grow: 1;
}

.plan-specs li {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.92rem;
  color: var(--text-body);
  margin-bottom: 14px;
}

.plan-specs svg {
  width: 18px;
  height: 18px;
  color: var(--sky-stratosphere);
  flex-shrink: 0;
}

.plan-specs .disabled-spec {
  color: var(--text-muted);
  opacity: 0.6;
}

.plan-specs .disabled-spec svg {
  color: var(--text-muted);
}

/* --------------------------------------------------------------------------
   9. 用户评价 (High-Altitude Trust Testimonials)
   -------------------------------------------------------------------------- */
.testimonials-winglet-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.testimonial-winglet {
  background: var(--bg-card);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--border-aerodynamic);
  border-radius: var(--radius-winglet);
  padding: 34px 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: var(--shadow-cloud);
  transition: var(--transition-wind);
}

.testimonial-winglet:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-winglet);
  border-color: var(--sky-stratosphere);
}

.stars-gold {
  display: flex;
  gap: 4px;
  color: var(--rotor-gold);
  margin-bottom: 16px;
}

.stars-gold svg {
  width: 18px;
  height: 18px;
}

.testimonial-quote {
  font-size: 0.96rem;
  line-height: 1.7;
  color: var(--text-body);
  margin-bottom: 24px;
  flex-grow: 1;
}

.avatar-crew {
  display: flex;
  align-items: center;
  gap: 14px;
}

.avatar-badge {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--sky-stratosphere) 0%, #0284c7 100%);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.05rem;
  box-shadow: 0 4px 12px rgba(0, 163, 224, 0.25);
}

.crew-meta h4 {
  font-size: 0.95rem;
  font-weight: 800;
  color: var(--text-main);
}

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

/* --------------------------------------------------------------------------
   10. 常见问题解答 (FAQ 手风琴)
   -------------------------------------------------------------------------- */
.faq-box-container {
  max-width: 840px;
  margin: 0 auto;
}

.faq-winglet-item {
  background: var(--bg-card);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--border-aerodynamic);
  border-radius: var(--radius-sm);
  margin-bottom: 16px;
  transition: var(--transition-wind);
  overflow: hidden;
}

.faq-winglet-item:hover {
  border-color: var(--sky-stratosphere);
}

.faq-winglet-btn {
  width: 100%;
  padding: 22px 26px;
  font-size: 1.06rem;
  font-weight: 800;
  color: var(--text-main);
  display: flex;
  align-items: center;
  justify-content: space-between;
  text-align: left;
  cursor: pointer;
  background: none;
}

.faq-toggle-icon {
  width: 22px;
  height: 22px;
  color: var(--sky-stratosphere);
  transition: transform 0.35s var(--ease-aerodynamic);
  flex-shrink: 0;
  margin-left: 12px;
}

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

.faq-winglet-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s var(--ease-aerodynamic), padding 0.35s ease;
  color: var(--text-body);
  font-size: 0.96rem;
  line-height: 1.75;
  padding: 0 26px;
}

.faq-winglet-item.active .faq-winglet-body {
  max-height: 320px;
  padding: 0 26px 24px 26px;
}

/* --------------------------------------------------------------------------
   11. 页底呼吁区 (Bottom CTA)
   -------------------------------------------------------------------------- */
.bottom-flight-cta {
  padding: 85px 0;
  text-align: center;
  background: radial-gradient(circle at center, rgba(0, 163, 224, 0.1) 0%, rgba(240, 249, 255, 0.4) 100%);
  position: relative;
}

.bottom-flight-cta h2 {
  font-size: 2.35rem;
  font-weight: 900;
  color: var(--text-main);
  margin-bottom: 16px;
}

.bottom-flight-cta p {
  font-size: 1.12rem;
  color: var(--text-body);
  max-width: 640px;
  margin: 0 auto 34px;
}

/* --------------------------------------------------------------------------
   12. 页脚规范 (Footer) - 严格只保留 4 个指定标题，内容打开新页面展示
   -------------------------------------------------------------------------- */
.site-footer {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  padding: 48px 0;
  border-top: 1px solid var(--border-aerodynamic);
}

.footer-nav-only {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 44px;
  flex-wrap: wrap;
  margin-bottom: 24px;
}

.footer-nav-link {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-body);
  padding: 8px 18px;
  border-radius: var(--radius-pill);
  transition: var(--transition-wind);
  white-space: nowrap;
}

.footer-nav-link:hover {
  color: var(--sky-stratosphere);
  background: rgba(0, 163, 224, 0.08);
}

.footer-copyright {
  text-align: center;
  font-size: 0.86rem;
  color: var(--text-muted);
}

/* --------------------------------------------------------------------------
   13. 独立子页面样式规范
   -------------------------------------------------------------------------- */
.page-content-wrapper {
  padding: 65px 0 95px;
}

.page-header-box {
  margin-bottom: 38px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-aerodynamic);
}

.page-title {
  font-size: 2.45rem;
  font-weight: 900;
  color: var(--text-main);
  margin-bottom: 12px;
}

.page-desc {
  font-size: 1.05rem;
  color: var(--text-body);
}

.page-article {
  background: var(--bg-card);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--border-aerodynamic);
  border-radius: var(--radius-winglet);
  padding: 48px 42px;
  box-shadow: var(--shadow-cloud);
}

.page-article h2 {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-main);
  margin: 36px 0 16px;
  padding-left: 14px;
  border-left: 4px solid var(--sky-stratosphere);
}

.page-article h2:first-child {
  margin-top: 0;
}

.page-article h3 {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-main);
  margin: 24px 0 12px;
}

.page-article p {
  font-size: 1rem;
  color: var(--text-body);
  line-height: 1.8;
  margin-bottom: 18px;
}

.page-article ul {
  list-style: disc;
  margin-left: 24px;
  margin-bottom: 22px;
}

.page-article li {
  font-size: 0.98rem;
  color: var(--text-body);
  line-height: 1.8;
  margin-bottom: 8px;
}

.back-home-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--sky-stratosphere);
  margin-bottom: 28px;
}

.back-home-btn:hover {
  text-decoration: underline;
}

/* 资讯文章卡片网格 (用于推荐资讯页) */
.dispatch-cards-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
  margin-top: 24px;
}

.dispatch-article-card {
  background: var(--sky-breeze);
  border: 1px solid var(--border-aerodynamic);
  border-radius: var(--radius-sm);
  padding: 28px;
  transition: var(--transition-wind);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.dispatch-article-card:hover {
  transform: translateY(-4px);
  border-color: var(--sky-stratosphere);
  background: #ffffff;
  box-shadow: var(--shadow-cloud);
}

.dispatch-tag {
  font-size: 0.78rem;
  font-weight: 800;
  color: var(--rotor-brass);
  text-transform: uppercase;
  margin-bottom: 10px;
}

.dispatch-title {
  font-size: 1.28rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 12px;
  line-height: 1.45;
}

.dispatch-summary {
  font-size: 0.94rem;
  color: var(--text-body);
  line-height: 1.7;
  margin-bottom: 20px;
}

.dispatch-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* ==========================================================================
   长篇深度 SEO 科普文章组件样式 (Article TOC, FAQ, Highlights, Internal Links)
   ========================================================================== */
.article-header {
  margin-bottom: 36px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-aerodynamic);
}

.article-badge-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.article-main-title {
  font-size: 2.35rem;
  font-weight: 900;
  color: var(--text-main);
  line-height: 1.35;
  margin-bottom: 16px;
}

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

/* 文章目录 (TOC - Table of Contents) */
.article-toc {
  background: var(--sky-breeze);
  border: 1px solid var(--border-aerodynamic);
  border-left: 4px solid var(--sky-stratosphere);
  border-radius: var(--radius-sm);
  padding: 24px 28px;
  margin: 28px 0 36px;
}

.toc-title {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}

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

.toc-list li {
  margin-bottom: 10px;
  font-size: 0.95rem;
  line-height: 1.6;
}

.toc-list a {
  color: var(--text-body);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.toc-list a:hover {
  color: var(--sky-stratosphere);
  text-decoration: underline;
}

/* 正文重点与高亮框 */
.article-callout {
  background: rgba(0, 163, 224, 0.08);
  border-left: 4px solid var(--sky-stratosphere);
  border-radius: var(--radius-sm);
  padding: 20px 24px;
  margin: 28px 0;
}

.article-callout-gold {
  background: rgba(234, 179, 8, 0.1);
  border-left: 4px solid var(--rotor-gold);
}

.article-callout h4 {
  font-size: 1.08rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 8px;
}

.article-callout p {
  margin-bottom: 0;
  font-size: 0.96rem;
  color: var(--text-body);
}

/* 内链与锚文本样式 (SEO Internal Links) */
.seo-internal-link {
  color: var(--sky-stratosphere);
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 4px;
  transition: var(--transition-wind);
}

.seo-internal-link:hover {
  color: var(--rotor-brass);
}

/* 文章内部对比表格 */
.article-table-wrap {
  overflow-x: auto;
  margin: 28px 0;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-aerodynamic);
}

.article-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.94rem;
}

.article-table th {
  background: var(--sky-breeze);
  color: var(--text-main);
  font-weight: 800;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border-aerodynamic);
  white-space: nowrap;
}

.article-table td {
  padding: 14px 18px;
  border-bottom: 1px solid var(--border-aerodynamic);
  color: var(--text-body);
}

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

.article-table tr:hover td {
  background: rgba(0, 163, 224, 0.04);
}

/* 文章内专属 FAQ 容器 */
.article-faq-section {
  margin: 48px 0 36px;
  padding-top: 32px;
  border-top: 1px dashed var(--border-aerodynamic);
}

.article-faq-item {
  background: var(--sky-breeze);
  border: 1px solid var(--border-aerodynamic);
  border-radius: var(--radius-sm);
  padding: 22px 24px;
  margin-bottom: 16px;
}

.article-faq-question {
  font-size: 1.12rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 10px;
}

.article-faq-answer {
  font-size: 0.96rem;
  color: var(--text-body);
  line-height: 1.75;
}

/* 相关阅读卡片 (Related Reading) */
.related-reading-box {
  margin: 50px 0 20px;
  padding-top: 32px;
  border-top: 1px solid var(--border-aerodynamic);
}

.related-reading-title {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.related-card {
  background: var(--sky-breeze);
  border: 1px solid var(--border-aerodynamic);
  border-radius: var(--radius-sm);
  padding: 20px 22px;
  transition: var(--transition-wind);
}

.related-card:hover {
  transform: translateY(-3px);
  border-color: var(--sky-stratosphere);
  background: #ffffff;
  box-shadow: var(--shadow-cloud);
}

.related-card h4 {
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 8px;
  line-height: 1.45;
}

.related-card p {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 0;
  line-height: 1.6;
}

.sitemap-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-top: 24px;
}

.sitemap-card {
  padding: 26px;
  background: var(--sky-breeze);
  border: 1px solid var(--border-aerodynamic);
  border-radius: var(--radius-sm);
}

.sitemap-card h3 {
  margin-top: 0;
  margin-bottom: 14px;
  color: var(--text-main);
  font-size: 1.18rem;
}

.sitemap-list li {
  margin-bottom: 10px;
}

.sitemap-list a {
  color: var(--sky-stratosphere);
  font-weight: 600;
}

.sitemap-list a:hover {
  text-decoration: underline;
}

/* --------------------------------------------------------------------------
   14. 响应式媒体查询 (@media) - 手机端单栏完美适配
   -------------------------------------------------------------------------- */
@media (max-width: 1240px) {
  .nav-wrap {
    gap: 10px;
  }
  .nav-links {
    gap: 4px;
  }
  .nav-link {
    font-size: 0.84rem;
    padding: 6px 8px;
  }
  .brand-logo {
    font-size: 1.15rem;
    gap: 8px;
  }
  .brand-badge {
    display: none;
  }
  .btn-primary {
    padding: 9px 18px;
    font-size: 0.88rem;
  }
}

@media (max-width: 1080px) {
  .nav-wrap {
    height: 66px;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 66px;
    left: 0;
    width: 100%;
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-aerodynamic);
    flex-direction: column;
    align-items: stretch;
    padding: 18px 24px;
    gap: 8px;
    box-shadow: var(--shadow-winglet);
    z-index: 1000;
  }

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

  .nav-link {
    font-size: 0.98rem;
    padding: 10px 16px;
    border-radius: var(--radius-sm);
    justify-content: flex-start;
  }

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

@media (max-width: 1024px) {
  .hero-flight-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .rotor-stage-container {
    max-width: 500px;
    margin: 0 auto;
  }
  .grid-winglets-3,
  .pricing-deck-grid,
  .testimonials-winglet-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-plan-winglet.featured-winglet {
    transform: none;
  }
  .pricing-plan-winglet.featured-winglet:hover {
    transform: translateY(-8px);
  }
}

@media (max-width: 768px) {
  .container {
    padding-left: 20px;
    padding-right: 20px;
  }

  .hero-section {
    padding: 50px 0 40px;
  }

  .hero-title {
    font-size: 2.2rem;
    line-height: 1.25;
  }

  .hero-subtitle {
    font-size: 1.08rem;
  }

  .hero-desc {
    font-size: 0.98rem;
  }

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

  .hero-actions .btn {
    width: 100%;
  }

  /* 手机端单栏垂直布局 */
  .grid-winglets-3,
  .grid-winglets-2,
  .pricing-deck-grid,
  .testimonials-winglet-grid,
  .dispatch-cards-grid,
  .sitemap-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

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

  .section-flight {
    padding: 60px 0;
  }

  .section-title {
    font-size: 1.85rem;
  }

  .showcase-winglet,
  .pricing-plan-winglet,
  .page-article {
    padding: 30px 22px;
  }

  .footer-nav-only {
    flex-direction: column;
    gap: 14px;
  }
}