/* ==========================================================================
   飞机云机场网 (feijiyunn.mom) - 原生 Native CSS 极致性能设计系统
   纯原生 HTML5 + CSS3，无重型 JS 框架，秒开级别加载速度，响应式全终端适配
   ========================================================================== */

:root {
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;

  /* Theme Color Palette */
  --bg-dark: #040816;
  --bg-card: rgba(11, 20, 42, 0.78);
  --bg-card-hover: rgba(18, 32, 64, 0.90);
  --bg-glass: rgba(7, 14, 30, 0.82);
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-glow: rgba(56, 189, 248, 0.45);

  --sky-primary: #38bdf8;
  --sky-light: #7dd3fc;
  --blue-vivid: #0284c7;
  --indigo-vivid: #6366f1;
  --indigo-light: #a5b4fc;
  --cyan-accent: #06b6d4;
  --emerald-accent: #10b981;
  --amber-accent: #f59e0b;
  --rose-accent: #f43f5e;

  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  --shadow-card: 0 12px 36px -10px rgba(0, 0, 0, 0.65);
  --shadow-glow: 0 0 28px rgba(56, 189, 248, 0.28);
  --shadow-btn: 0 8px 24px -6px rgba(56, 189, 248, 0.5);

  --container-max: 1240px;
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Base Reset */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: var(--font-sans);
  background-color: var(--bg-dark);
  color: var(--text-main);
  line-height: 1.6;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  position: relative;
  min-height: 100vh;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
}

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

ul, ol {
  list-style: none;
}

/* ==========================================================================
   纯 CSS 动态星空与科技机械齿轮背景 (Dynamic Cyber Gears Background)
   无需任何 JS 代码，完全由 CSS 关键帧与硬件加速平移/旋转实现，极速流畅
   ========================================================================== */
.dynamic-background {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -1;
  overflow: hidden;
  background: radial-gradient(circle at 50% 12%, #081a3e 0%, #040a1c 55%, #02050e 100%);
}

/* 动态机械科技齿轮系统 (Dynamic Cyber Gears) */
.gears-backdrop {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  overflow: hidden;
  z-index: 1;
}

.gear-unit {
  position: absolute;
  pointer-events: none;
  will-change: transform;
  filter: drop-shadow(0 0 18px rgba(56, 189, 248, 0.25));
}

.gear-rotate-cw {
  animation: rotateGearCw linear infinite;
}

.gear-rotate-ccw {
  animation: rotateGearCcw linear infinite;
}

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

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

/* 各齿轮空间排布、大小尺寸与转速设定 */
.gear-1 {
  width: 480px;
  height: 480px;
  top: -100px;
  right: -80px;
  opacity: 0.32;
  animation-duration: 54s;
}

.gear-2 {
  width: 310px;
  height: 310px;
  top: 240px;
  right: 250px;
  opacity: 0.28;
  animation-duration: 34s;
}

.gear-3 {
  width: 180px;
  height: 180px;
  top: 140px;
  right: 480px;
  opacity: 0.34;
  animation-duration: 21s;
}

.gear-4 {
  width: 450px;
  height: 450px;
  bottom: -60px;
  left: -90px;
  opacity: 0.30;
  animation-duration: 60s;
}

.gear-5 {
  width: 280px;
  height: 280px;
  bottom: 240px;
  left: 180px;
  opacity: 0.25;
  animation-duration: 36s;
}

.gear-6 {
  width: 170px;
  height: 170px;
  bottom: 180px;
  left: 390px;
  opacity: 0.32;
  animation-duration: 22s;
}

.gear-7 {
  width: 650px;
  height: 650px;
  top: 45%;
  right: -180px;
  opacity: 0.16;
  animation-duration: 96s;
}

.gear-8 {
  width: 330px;
  height: 330px;
  top: 36%;
  left: -80px;
  opacity: 0.22;
  animation-duration: 46s;
}

/* 浮动氛围光晕 (Ambient Aero Glow Orbs) */
.aero-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.45;
  pointer-events: none;
}

.aero-orb-1 {
  width: 580px;
  height: 580px;
  top: -120px;
  left: 10%;
  background: radial-gradient(circle, rgba(56, 189, 248, 0.35) 0%, rgba(2, 132, 199, 0.15) 60%, transparent 100%);
  animation: orbFloat1 22s ease-in-out infinite alternate;
}

.aero-orb-2 {
  width: 650px;
  height: 650px;
  top: 35%;
  right: -100px;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.3) 0%, rgba(79, 70, 229, 0.12) 60%, transparent 100%);
  animation: orbFloat2 26s ease-in-out infinite alternate;
}

.aero-orb-3 {
  width: 500px;
  height: 500px;
  bottom: 8%;
  left: 20%;
  background: radial-gradient(circle, rgba(6, 182, 212, 0.25) 0%, rgba(14, 165, 233, 0.1) 60%, transparent 100%);
  animation: orbFloat3 24s ease-in-out infinite alternate;
}

@keyframes orbFloat1 {
  0% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(60px, 40px) scale(1.1); }
  100% { transform: translate(-30px, 80px) scale(0.95); }
}

@keyframes orbFloat2 {
  0% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(-80px, -50px) scale(1.08); }
  100% { transform: translate(-40px, 60px) scale(0.92); }
}

@keyframes orbFloat3 {
  0% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(50px, -60px) scale(1.15); }
  100% { transform: translate(-40px, -30px) scale(1); }
}

/* 动感超音速喷气尾迹 / 航迹粒子流 (Jet Streams & Contrails) */
.jet-streams {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.streak {
  position: absolute;
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(90deg, transparent 0%, rgba(56, 189, 248, 0.8) 50%, #ffffff 80%, transparent 100%);
  filter: drop-shadow(0 0 6px rgba(56, 189, 248, 0.9));
  opacity: 0.6;
  transform: rotate(-25deg);
}

.streak-1 {
  width: 240px;
  top: 15%;
  left: -150px;
  animation: jetStreak 9s cubic-bezier(0.2, 0.8, 0.2, 1) infinite;
}

.streak-2 {
  width: 320px;
  top: 42%;
  left: -200px;
  animation: jetStreak 12s cubic-bezier(0.2, 0.8, 0.2, 1) 3s infinite;
}

.streak-3 {
  width: 280px;
  top: 68%;
  left: -180px;
  animation: jetStreak 10s cubic-bezier(0.2, 0.8, 0.2, 1) 6s infinite;
}

.streak-4 {
  width: 360px;
  top: 28%;
  left: -220px;
  animation: jetStreak 14s cubic-bezier(0.2, 0.8, 0.2, 1) 8s infinite;
}

@keyframes jetStreak {
  0% {
    transform: translate(-100px, 0) rotate(-25deg);
    opacity: 0;
  }
  15% {
    opacity: 0.85;
  }
  85% {
    opacity: 0.85;
  }
  100% {
    transform: translate(2200px, 900px) rotate(-25deg);
    opacity: 0;
  }
}

/* 极速微粒网格与星空 (Star Dust Overlay) */
.stars-overlay {
  position: absolute;
  inset: 0;
  background-image: 
    radial-gradient(1px 1px at 25px 35px, #38bdf8, transparent),
    radial-gradient(1.5px 1.5px at 120px 80px, #ffffff, transparent),
    radial-gradient(1px 1px at 280px 190px, #818cf8, transparent),
    radial-gradient(1.2px 1.2px at 420px 290px, #38bdf8, transparent),
    radial-gradient(1px 1px at 640px 140px, #ffffff, transparent),
    radial-gradient(1.5px 1.5px at 850px 380px, #60a5fa, transparent),
    radial-gradient(1px 1px at 1050px 210px, #ffffff, transparent);
  background-repeat: repeat;
  background-size: 1100px 500px;
  opacity: 0.45;
}

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

.section {
  padding: 85px 0;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 820px;
  margin: 0 auto 50px auto;
}

.section-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: var(--radius-full);
  background: rgba(56, 189, 248, 0.12);
  border: 1px solid rgba(56, 189, 248, 0.35);
  color: var(--sky-primary);
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.5px;
  margin-bottom: 16px;
  text-transform: uppercase;
}

.section-badge .dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--sky-primary);
  box-shadow: 0 0 10px var(--sky-primary);
}

.section-title {
  font-size: 2.35rem;
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.5px;
  margin-bottom: 16px;
  background: linear-gradient(135deg, #ffffff 40%, #bae6fd 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* ==========================================================================
   顶部导航栏 (Navbar)
   ========================================================================== */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  transition: all var(--transition-fast);
}

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

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

.nav-brand img, .nav-brand svg {
  height: 44px;
  width: auto;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-link {
  color: #cbd5e1;
  font-size: 0.95rem;
  font-weight: 500;
  transition: color var(--transition-fast);
}

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

.nav-cta-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 22px;
  background: linear-gradient(135deg, var(--sky-primary) 0%, var(--indigo-vivid) 100%);
  color: #ffffff;
  font-weight: 700;
  font-size: 0.92rem;
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-btn);
  border: 1px solid rgba(255, 255, 255, 0.2);
  transition: all var(--transition-fast);
}

.nav-cta-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 28px -4px rgba(56, 189, 248, 0.65);
}

/* ==========================================================================
   Hero 核心首屏区域 (Hero Section)
   ========================================================================== */
.hero-section {
  padding: 80px 0 65px 0;
  text-align: center;
  position: relative;
}

.hero-content {
  max-width: 960px;
  margin: 0 auto;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 20px;
  background: rgba(14, 165, 233, 0.12);
  border: 1px solid rgba(56, 189, 248, 0.35);
  border-radius: var(--radius-full);
  color: var(--sky-light);
  font-size: 0.92rem;
  font-weight: 600;
  margin-bottom: 24px;
}

.hero-pill-tag {
  background: var(--sky-primary);
  color: #030712;
  font-size: 0.75rem;
  font-weight: 800;
  padding: 2px 8px;
  border-radius: 4px;
  text-transform: uppercase;
}

.hero-title {
  font-size: 3.4rem;
  font-weight: 900;
  line-height: 1.18;
  letter-spacing: -1px;
  margin-bottom: 22px;
}

.text-gradient {
  background: linear-gradient(135deg, #ffffff 15%, var(--sky-primary) 65%, var(--indigo-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-slogan-highlight {
  display: inline-block;
  font-size: 0.84em;
  font-weight: 800;
  letter-spacing: -0.5px;
  background: linear-gradient(135deg, #ffffff 15%, #7dd3fc 55%, #c084fc 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  text-shadow: 0 0 35px rgba(56, 189, 248, 0.35);
  margin-top: 8px;
}

.hero-subtitle {
  font-size: 1.22rem;
  color: #cbd5e1;
  max-width: 820px;
  margin: 0 auto 34px auto;
  line-height: 1.75;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  flex-wrap: wrap;
  margin-bottom: 38px;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 16px 36px;
  font-size: 1.08rem;
  font-weight: 800;
  color: #ffffff;
  background: linear-gradient(135deg, #0284c7 0%, #38bdf8 50%, #6366f1 100%);
  border-radius: var(--radius-full);
  box-shadow: 0 10px 30px -5px rgba(56, 189, 248, 0.55);
  border: 1px solid rgba(255, 255, 255, 0.25);
  transition: all var(--transition-fast);
}

.btn-primary:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 16px 38px -4px rgba(56, 189, 248, 0.7);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 16px 32px;
  font-size: 1.05rem;
  font-weight: 600;
  color: #e2e8f0;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  backdrop-filter: blur(10px);
  transition: all var(--transition-fast);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.25);
  color: #ffffff;
  transform: translateY(-2px);
}

.hero-trust-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
  color: var(--text-muted);
  font-size: 0.92rem;
  flex-wrap: wrap;
}

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

.trust-item svg {
  color: var(--emerald-accent);
}

/* ==========================================================================
   核心性能监控看板 (Performance Dashboard Stats)
   ========================================================================== */
.stats-banner {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  box-shadow: var(--shadow-card);
  margin-top: 50px;
}

.stat-box {
  text-align: center;
  padding: 0 12px;
}

.stat-box:not(:last-child) {
  border-right: 1px solid var(--border-subtle);
}

.stat-value {
  font-size: 2.1rem;
  font-weight: 900;
  color: var(--sky-primary);
  line-height: 1.2;
  margin-bottom: 6px;
  font-family: var(--font-mono);
}

.stat-label {
  font-size: 0.92rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* ==========================================================================
   套餐与价格区域 (Pricing Section) — 严格执行“所有价格要同排”
   ========================================================================== */
.pricing-section {
  background: linear-gradient(180deg, transparent 0%, rgba(10, 20, 45, 0.45) 50%, transparent 100%);
}

/* 同排关键栅格布局：4张卡片在桌面端强行同排对齐 */
.pricing-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  align-items: stretch;
  margin-bottom: 40px;
}

.pricing-card {
  position: relative;
  display: flex;
  flex-direction: column;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 30px 22px;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-card);
  backdrop-filter: blur(12px);
}

.pricing-card:hover {
  transform: translateY(-8px);
  border-color: var(--sky-primary);
  box-shadow: 0 20px 45px -10px rgba(56, 189, 248, 0.35);
}

/* 爆款推荐高亮卡片 */
.pricing-card.featured {
  background: linear-gradient(180deg, rgba(14, 30, 68, 0.95) 0%, rgba(8, 18, 42, 0.9) 100%);
  border: 2px solid var(--sky-primary);
  box-shadow: 0 0 35px rgba(56, 189, 248, 0.35), var(--shadow-card);
  transform: scale(1.02);
  z-index: 2;
}

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

.pricing-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, #0284c7, #6366f1);
  color: #ffffff;
  font-size: 0.78rem;
  font-weight: 800;
  padding: 4px 14px;
  border-radius: var(--radius-full);
  letter-spacing: 0.8px;
  text-transform: uppercase;
  box-shadow: 0 4px 14px rgba(56, 189, 248, 0.4);
}

.plan-header {
  text-align: center;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: 22px;
}

.plan-name {
  font-size: 1.35rem;
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 6px;
}

.plan-tagline {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.plan-price-wrap {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 4px;
  margin: 18px 0 6px 0;
}

.plan-currency {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--sky-primary);
}

.plan-amount {
  font-size: 3rem;
  font-weight: 900;
  color: #ffffff;
  line-height: 1;
  font-family: var(--font-mono);
}

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

.plan-period-alt {
  font-size: 0.82rem;
  color: var(--emerald-accent);
  font-weight: 600;
}

.plan-features {
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  gap: 13px;
  margin-bottom: 28px;
}

.feature-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.92rem;
  color: #cbd5e1;
  line-height: 1.45;
}

.feature-icon {
  flex-shrink: 0;
  width: 18px;
  height: 18px;
  margin-top: 2px;
  color: var(--sky-primary);
}

.feature-item.highlight {
  color: #ffffff;
  font-weight: 600;
}

.feature-item.highlight .feature-icon {
  color: var(--emerald-accent);
}

.pricing-cta {
  display: block;
  width: 100%;
  text-align: center;
  padding: 13px 20px;
  font-size: 0.98rem;
  font-weight: 700;
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
}

.pricing-cta.btn-glow {
  background: linear-gradient(135deg, var(--sky-primary) 0%, var(--indigo-vivid) 100%);
  color: #ffffff;
  box-shadow: 0 6px 20px -3px rgba(56, 189, 248, 0.55);
}

.pricing-cta.btn-glow:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 25px -2px rgba(56, 189, 248, 0.7);
}

.pricing-cta.btn-outline {
  background: rgba(255, 255, 255, 0.05);
  color: #ffffff;
  border: 1px solid var(--border-subtle);
}

.pricing-cta.btn-outline:hover {
  background: rgba(56, 189, 248, 0.15);
  border-color: var(--sky-primary);
  color: var(--sky-primary);
  transform: translateY(-2px);
}

.pricing-notice-bar {
  text-align: center;
  background: rgba(14, 165, 233, 0.08);
  border: 1px dashed rgba(56, 189, 248, 0.3);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  color: #94a3b8;
  font-size: 0.92rem;
}

.pricing-notice-bar strong {
  color: var(--sky-primary);
}

/* ==========================================================================
   核心优势卡片网格 (Features & Advantages)
   ========================================================================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 32px 26px;
  transition: all var(--transition-fast);
}

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

.card-icon-wrap {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(56, 189, 248, 0.12);
  color: var(--sky-primary);
  margin-bottom: 20px;
  border: 1px solid rgba(56, 189, 248, 0.25);
}

.card-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 10px;
}

.card-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* ==========================================================================
   测速与全球节点列表 (Speed Test & Node Matrix)
   ========================================================================== */
.nodes-matrix-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 34px 28px;
  box-shadow: var(--shadow-card);
}

.nodes-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.nodes-table th {
  padding: 14px 18px;
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border-bottom: 1px solid var(--border-subtle);
}

.nodes-table td {
  padding: 16px 18px;
  font-size: 0.95rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.nodes-table tr:hover td {
  background: rgba(255, 255, 255, 0.02);
}

.node-region {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  color: #ffffff;
}

.region-flag {
  font-size: 1.25rem;
}

.node-type-badge {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 4px;
  font-size: 0.78rem;
  font-weight: 700;
}

.badge-iepl {
  background: rgba(16, 185, 129, 0.15);
  color: #34d399;
  border: 1px solid rgba(16, 185, 129, 0.35);
}

.badge-bgp {
  background: rgba(56, 189, 248, 0.15);
  color: var(--sky-primary);
  border: 1px solid rgba(56, 189, 248, 0.35);
}

.latency-bar-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
}

.latency-bar {
  flex-grow: 1;
  height: 6px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 999px;
  overflow: hidden;
  max-width: 100px;
}

.latency-fill {
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, #10b981, #38bdf8);
}

.status-online {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: #34d399;
  font-weight: 600;
  font-size: 0.88rem;
}

.status-online::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #34d399;
  box-shadow: 0 0 8px #34d399;
}

/* ==========================================================================
   深度评测与机场文章专区 (Articles Showcase Grid)
   ========================================================================== */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}

.article-card {
  display: flex;
  flex-direction: column;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px 20px;
  transition: all var(--transition-fast);
}

.article-card:hover {
  transform: translateY(-5px);
  border-color: var(--sky-primary);
  box-shadow: 0 14px 32px -8px rgba(56, 189, 248, 0.25);
}

.article-tag {
  display: inline-block;
  align-self: flex-start;
  padding: 3px 10px;
  background: rgba(56, 189, 248, 0.12);
  border: 1px solid rgba(56, 189, 248, 0.3);
  color: var(--sky-primary);
  font-size: 0.78rem;
  font-weight: 700;
  border-radius: 4px;
  margin-bottom: 14px;
}

.article-title {
  font-size: 1.12rem;
  font-weight: 700;
  color: #ffffff;
  line-height: 1.45;
  margin-bottom: 10px;
}

.article-summary {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 18px;
  flex-grow: 1;
}

.article-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 14px;
  border-top: 1px solid var(--border-subtle);
  font-size: 0.82rem;
  color: var(--text-dim);
}

.read-link {
  color: var(--sky-primary);
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.read-link:hover {
  text-decoration: underline;
}

/* ==========================================================================
   用户口碑评价专区 (User Reviews & Testimonials)
   ========================================================================== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 26px 22px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all var(--transition-fast);
}

.review-card:hover {
  border-color: rgba(56, 189, 248, 0.4);
  transform: translateY(-4px);
}

.review-stars {
  display: flex;
  gap: 3px;
  color: #f59e0b;
  margin-bottom: 14px;
  font-size: 0.95rem;
}

.review-text {
  font-size: 0.95rem;
  color: #e2e8f0;
  line-height: 1.65;
  margin-bottom: 20px;
}

.reviewer-meta {
  display: flex;
  align-items: center;
  gap: 12px;
}

.reviewer-avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: linear-gradient(135deg, #0284c7, #6366f1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 0.95rem;
  color: #ffffff;
  border: 2px solid rgba(255, 255, 255, 0.15);
}

.reviewer-name {
  font-size: 0.95rem;
  font-weight: 700;
  color: #ffffff;
}

.reviewer-title {
  font-size: 0.82rem;
  color: var(--text-dim);
}

/* ==========================================================================
   常见问题解答 (FAQ Accordion / List)
   ========================================================================== */
.faq-wrap {
  max-width: 880px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 24px 26px;
  transition: all var(--transition-fast);
}

.faq-card:hover {
  border-color: var(--border-glow);
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  font-size: 1.12rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 10px;
}

.faq-q-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border-radius: 6px;
  background: rgba(56, 189, 248, 0.15);
  color: var(--sky-primary);
  font-size: 0.82rem;
  font-weight: 800;
  flex-shrink: 0;
}

.faq-answer {
  font-size: 0.95rem;
  color: #cbd5e1;
  line-height: 1.7;
  padding-left: 40px;
}

/* ==========================================================================
   权威行业外链推荐 (External Resources & Authority Links)
   ========================================================================== */
.external-links-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.ext-link-card {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 18px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.ext-link-card:hover {
  border-color: var(--sky-primary);
  transform: translateY(-2px);
  background: var(--bg-card-hover);
}

.ext-link-icon {
  font-size: 1.5rem;
  flex-shrink: 0;
}

.ext-link-info {
  display: flex;
  flex-direction: column;
}

.ext-link-name {
  font-size: 0.98rem;
  font-weight: 700;
  color: #ffffff;
}

.ext-link-desc {
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* ==========================================================================
   底部呼吁横幅与页脚 (Bottom CTA & Footer)
   ========================================================================== */
.bottom-cta-box {
  background: linear-gradient(135deg, rgba(2, 132, 199, 0.25) 0%, rgba(99, 102, 241, 0.25) 100%), var(--bg-card);
  border: 1px solid var(--sky-primary);
  border-radius: var(--radius-lg);
  padding: 55px 36px;
  text-align: center;
  box-shadow: var(--shadow-glow);
  margin-bottom: 70px;
}

.bottom-cta-title {
  font-size: 2.2rem;
  font-weight: 900;
  color: #ffffff;
  margin-bottom: 14px;
}

.bottom-cta-desc {
  font-size: 1.08rem;
  color: #cbd5e1;
  max-width: 680px;
  margin: 0 auto 30px auto;
}

.footer {
  background: #02040b;
  border-top: 1px solid var(--border-subtle);
  padding: 55px 0 35px 0;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 36px;
  margin-bottom: 40px;
}

.footer-brand-desc {
  font-size: 0.9rem;
  color: var(--text-dim);
  line-height: 1.65;
  margin-top: 14px;
}

.footer-col-title {
  font-size: 1rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 18px;
}

.footer-links-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links-list a:hover {
  color: var(--sky-primary);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 25px;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  font-size: 0.85rem;
  color: var(--text-dim);
  flex-wrap: wrap;
  gap: 14px;
}

/* ==========================================================================
   文章详情页排版专用样式 (Article Layout & Typography)
   ========================================================================== */
.article-header-section {
  padding: 50px 0 35px 0;
  border-bottom: 1px solid var(--border-subtle);
}

.breadcrumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-dim);
  margin-bottom: 20px;
}

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

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

.article-main-title {
  font-size: 2.5rem;
  font-weight: 900;
  line-height: 1.25;
  color: #ffffff;
  margin-bottom: 18px;
}

.article-meta-bar {
  display: flex;
  align-items: center;
  gap: 22px;
  color: var(--text-dim);
  font-size: 0.88rem;
  flex-wrap: wrap;
}

.article-body-layout {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 40px;
  padding: 50px 0 80px 0;
}

.article-content {
  font-size: 1.05rem;
  line-height: 1.85;
  color: #cbd5e1;
}

.article-content h2 {
  font-size: 1.75rem;
  font-weight: 800;
  color: #ffffff;
  margin: 38px 0 16px 0;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-subtle);
}

.article-content h3 {
  font-size: 1.35rem;
  font-weight: 700;
  color: #f1f5f9;
  margin: 28px 0 12px 0;
}

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

.article-content ul, .article-content ol {
  margin: 16px 0 24px 24px;
}

.article-content ul li {
  list-style-type: disc;
  margin-bottom: 8px;
}

.article-content ol li {
  list-style-type: decimal;
  margin-bottom: 8px;
}

.article-content strong {
  color: #ffffff;
  font-weight: 700;
}

.article-callout {
  background: rgba(14, 165, 233, 0.08);
  border-left: 4px solid var(--sky-primary);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 18px 22px;
  margin: 26px 0;
  font-size: 0.98rem;
}

.article-callout.tip {
  background: rgba(16, 185, 129, 0.08);
  border-left-color: var(--emerald-accent);
}

.article-table-wrap {
  overflow-x: auto;
  margin: 28px 0;
}

.content-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--bg-card);
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border-subtle);
}

.content-table th, .content-table td {
  padding: 14px 18px;
  text-align: left;
  border-bottom: 1px solid var(--border-subtle);
  font-size: 0.92rem;
}

.content-table th {
  background: rgba(255, 255, 255, 0.04);
  color: #ffffff;
}

.sidebar-sticky {
  position: sticky;
  top: 92px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.sidebar-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 24px;
}

.sidebar-title {
  font-size: 1.1rem;
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-subtle);
}

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

.sidebar-link-item {
  font-size: 0.9rem;
  color: #cbd5e1;
  line-height: 1.45;
  transition: color var(--transition-fast);
}

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

.sidebar-cta-card {
  background: linear-gradient(135deg, rgba(2, 132, 199, 0.25) 0%, rgba(99, 102, 241, 0.25) 100%), var(--bg-card);
  border: 1px solid var(--sky-primary);
  text-align: center;
}

/* ==========================================================================
   响应式媒体查询 (Responsive Breakpoints)
   ========================================================================== */
@media (max-width: 1100px) {
  .pricing-row {
    grid-template-columns: repeat(2, 1fr);
  }
  .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 860px) {
  .hero-title {
    font-size: 2.45rem;
  }
  .pricing-row {
    grid-template-columns: 1fr;
    max-width: 440px;
    margin-left: auto;
    margin-right: auto;
  }
  .pricing-card.featured {
    transform: none;
  }
  .pricing-card.featured:hover {
    transform: translateY(-6px);
  }
  .stats-banner {
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
  }
  .stat-box:nth-child(2) {
    border-right: none;
  }
  .nav-menu {
    display: none;
  }
  .article-body-layout {
    grid-template-columns: 1fr;
  }
  .reviews-grid, .features-grid, .external-links-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 2rem;
  }
  .section-title {
    font-size: 1.8rem;
  }
  .stats-banner {
    grid-template-columns: 1fr;
  }
  .stat-box {
    border-right: none !important;
    border-bottom: 1px solid var(--border-subtle);
    padding-bottom: 14px;
  }
  .stat-box:last-child {
    border-bottom: none;
  }
  .articles-grid {
    grid-template-columns: 1fr;
  }
}