/* ==========================================================================
   快冲云网 (kuaichongyun.lol) 官方落地页原生样式表
   规范：纯原生 CSS，零重型第三方库，保证毫秒级秒开与最佳 SEO 性能体验
   ========================================================================== */

:root {
  --bg-primary: #050913;
  --bg-secondary: #0a1120;
  --bg-card: rgba(12, 21, 38, 0.82);
  --bg-card-hover: rgba(17, 29, 53, 0.95);
  --bg-card-featured: rgba(0, 242, 254, 0.08);
  --border-color: rgba(255, 255, 255, 0.09);
  --border-hover: rgba(56, 189, 248, 0.45);
  --border-featured: rgba(0, 242, 254, 0.55);
  
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  
  --primary-start: #00f2fe;
  --primary-end: #38bdf8;
  --accent-cyan: #00f2fe;
  --accent-blue: #3b82f6;
  --accent-amber: #fbbf24;
  --accent-emerald: #10b981;
  --accent-rose: #f43f5e;
  
  --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;
  
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  
  --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 10px 25px -5px rgba(0, 0, 0, 0.45);
  --shadow-glow: 0 0 25px rgba(0, 242, 254, 0.25);
  --shadow-featured: 0 0 35px rgba(0, 242, 254, 0.4);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  scroll-padding-top: 84px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.65;
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
}

/* ==========================================================================
   各种各样的宇宙动态深空背景系统 (Pure CSS Dynamic Cosmic Universe & Galaxies)
   包含：仙女座紫红星云、猎户座青蓝星云、创世金辉星尘、璀璨银河星空、旋转星系核心与流星雨
   ========================================================================== */
.cosmos-container,
.dynamic-bg-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: -2;
  overflow: hidden;
  background: radial-gradient(ellipse at bottom, #0d1b2a 0%, #050b14 60%, #02050b 100%);
  pointer-events: none;
}

/* 宇宙星云系统 (Nebulae) */
.nebula,
.dynamic-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(95px);
  opacity: 0.38;
  animation-timing-function: ease-in-out;
  animation-iteration-count: infinite;
  will-change: transform, opacity;
}

/* 1. 猎户座青蓝极光星云 (Orion Cyan Nebula) */
.nebula-cyan,
.orb-1 {
  width: 650px;
  height: 650px;
  background: radial-gradient(circle, #00f2fe 0%, rgba(56, 189, 248, 0.45) 45%, rgba(0, 242, 254, 0) 70%);
  top: -160px;
  left: -140px;
  animation-name: nebulaDrift1;
  animation-duration: 22s;
}

/* 2. 仙女座深空暗紫星云 (Andromeda Violet Nebula) */
.nebula-purple,
.orb-2 {
  width: 680px;
  height: 680px;
  background: radial-gradient(circle, #8b5cf6 0%, rgba(139, 92, 246, 0.45) 40%, rgba(99, 102, 241, 0) 70%);
  top: 25%;
  right: -180px;
  animation-name: nebulaDrift2;
  animation-duration: 28s;
}

/* 3. 船底座粉红星暴云 (Carina Magenta Nebula) */
.nebula-magenta,
.orb-3 {
  width: 580px;
  height: 580px;
  background: radial-gradient(circle, #d946ef 0%, rgba(236, 72, 153, 0.4) 45%, rgba(217, 70, 239, 0) 70%);
  bottom: -140px;
  left: 20%;
  animation-name: nebulaDrift3;
  animation-duration: 25s;
}

/* 4. 创世之柱超新星金辉星尘 (Stellar Golden Dust) */
.nebula-gold,
.orb-4 {
  width: 520px;
  height: 520px;
  background: radial-gradient(circle, #f59e0b 0%, rgba(251, 191, 36, 0.35) 40%, rgba(245, 158, 11, 0) 70%);
  top: 55%;
  left: -100px;
  animation-name: nebulaDrift4;
  animation-duration: 20s;
}

@keyframes nebulaDrift1 {
  0%, 100% { transform: translate(0, 0) scale(1) rotate(0deg); }
  33% { transform: translate(140px, 100px) scale(1.18) rotate(45deg); }
  66% { transform: translate(70px, 160px) scale(0.92) rotate(-30deg); }
}

@keyframes nebulaDrift2 {
  0%, 100% { transform: translate(0, 0) scale(1) rotate(0deg); }
  40% { transform: translate(-160px, -90px) scale(1.15) rotate(-50deg); }
  75% { transform: translate(-100px, 110px) scale(0.95) rotate(35deg); }
}

@keyframes nebulaDrift3 {
  0%, 100% { transform: translate(0, 0) scale(1) rotate(0deg); }
  35% { transform: translate(-110px, -120px) scale(1.22) rotate(60deg); }
  70% { transform: translate(130px, -70px) scale(0.88) rotate(-40deg); }
}

@keyframes nebulaDrift4 {
  0%, 100% { transform: translate(0, 0) scale(1) rotate(0deg); }
  50% { transform: translate(120px, -100px) scale(1.16) rotate(40deg); }
}

/* 宇宙旋转银河中心 (Galactic Core & Celestial Disk) */
.galactic-core {
  position: absolute;
  top: 12%;
  right: 12%;
  width: 440px;
  height: 440px;
  border-radius: 50%;
  background: radial-gradient(ellipse at center, rgba(168, 85, 247, 0.28) 0%, rgba(56, 189, 248, 0.18) 35%, rgba(0, 242, 254, 0.06) 60%, transparent 75%);
  filter: blur(45px);
  animation: galaxySpin 50s linear infinite;
  transform-origin: center center;
  pointer-events: none;
}

@keyframes galaxySpin {
  0% { transform: rotate(0deg) scale(1); }
  50% { transform: rotate(180deg) scale(1.12); }
  100% { transform: rotate(360deg) scale(1); }
}

/* 宇宙多层深空繁星与星光粒子系统 (Pure CSS Starfield) */
.stars-layer {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

/* 细微深空远景繁星 */
.stars-small {
  background-image: 
    radial-gradient(1px 1px at 25px 35px, #ffffff, transparent),
    radial-gradient(1px 1px at 50px 85px, rgba(255, 255, 255, 0.85), transparent),
    radial-gradient(1.5px 1.5px at 110px 45px, #38bdf8, transparent),
    radial-gradient(1px 1px at 175px 130px, #e0f2fe, transparent),
    radial-gradient(1.5px 1.5px at 240px 210px, #ffffff, transparent),
    radial-gradient(2px 2px at 320px 90px, #fde047, transparent),
    radial-gradient(1px 1px at 395px 255px, #c084fc, transparent),
    radial-gradient(1.5px 1.5px at 480px 165px, #ffffff, transparent),
    radial-gradient(1px 1px at 550px 70px, #38bdf8, transparent),
    radial-gradient(2px 2px at 620px 290px, #ffffff, transparent);
  background-size: 680px 380px;
  animation: starTwinkleSlow 4.5s ease-in-out infinite alternate;
}

/* 中景亮星与彩色恒星 */
.stars-medium {
  background-image: 
    radial-gradient(1.5px 1.5px at 60px 175px, #ffffff, transparent),
    radial-gradient(2px 2px at 135px 235px, #00f2fe, transparent),
    radial-gradient(1.5px 1.5px at 225px 105px, #fbcfe8, transparent),
    radial-gradient(2.5px 2.5px at 360px 325px, #ffffff, transparent),
    radial-gradient(1.5px 1.5px at 470px 85px, #67e8f9, transparent),
    radial-gradient(2px 2px at 595px 195px, #fef08a, transparent);
  background-size: 780px 480px;
  animation: starTwinkleMid 6s ease-in-out infinite alternate;
}

@keyframes starTwinkleSlow {
  0% { opacity: 0.55; }
  50% { opacity: 0.85; }
  100% { opacity: 1; }
}

@keyframes starTwinkleMid {
  0% { opacity: 0.4; transform: scale(0.98); }
  50% { opacity: 0.95; transform: scale(1.02); }
  100% { opacity: 0.5; transform: scale(0.98); }
}

/* 宇宙漫游星舰微影 (Cosmic Cruiser / Starship) */
.cosmic-cruiser {
  position: absolute;
  width: 76px;
  height: 52px;
  background-image: url('../assets/spaceship.svg');
  background-size: contain;
  background-repeat: no-repeat;
  opacity: 0.24;
  filter: drop-shadow(0 0 12px rgba(0, 242, 254, 0.75));
  animation: cruiseCosmos 48s linear infinite;
  pointer-events: none;
  z-index: 0;
}

@keyframes cruiseCosmos {
  0% {
    top: 85%;
    left: -120px;
    transform: rotate(-18deg) scale(0.6);
    opacity: 0;
  }
  10% {
    opacity: 0.26;
  }
  50% {
    top: 42%;
    left: 52%;
    transform: rotate(-26deg) scale(0.85);
    opacity: 0.32;
  }
  90% {
    opacity: 0.24;
  }
  100% {
    top: 8%;
    left: 106%;
    transform: rotate(-32deg) scale(0.68);
    opacity: 0;
  }
}

/* 划过宇宙天际的流星雨系统 (Shooting Stars / Meteors) */
.meteor {
  position: absolute;
  width: 170px;
  height: 2px;
  background: linear-gradient(90deg, #00f2fe, #38bdf8, transparent);
  border-radius: 9999px;
  filter: drop-shadow(0 0 6px #00f2fe);
  opacity: 0;
  pointer-events: none;
}

.meteor-1 {
  top: 12%;
  right: 20%;
  transform: rotate(-35deg);
  animation: shootMeteor 7s linear infinite;
  animation-delay: 1.2s;
}

.meteor-2 {
  top: 28%;
  right: 48%;
  transform: rotate(-35deg);
  animation: shootMeteor 9s linear infinite;
  animation-delay: 4.8s;
}

.meteor-3 {
  top: 48%;
  right: 18%;
  transform: rotate(-35deg);
  animation: shootMeteor 8s linear infinite;
  animation-delay: 8.5s;
}

.meteor-4 {
  top: 65%;
  right: 65%;
  transform: rotate(-35deg);
  animation: shootMeteor 10s linear infinite;
  animation-delay: 3.2s;
}

.meteor-5 {
  top: 18%;
  right: 75%;
  transform: rotate(-35deg);
  animation: shootMeteor 12s linear infinite;
  animation-delay: 7s;
}

@keyframes shootMeteor {
  0% {
    transform: rotate(-35deg) translateX(0);
    opacity: 0;
  }
  8% {
    opacity: 1;
  }
  22% {
    transform: rotate(-35deg) translateX(-480px);
    opacity: 0;
  }
  100% {
    transform: rotate(-35deg) translateX(-480px);
    opacity: 0;
  }
}

/* 深空天体星图几何与坐标网格 */
.cosmos-grid-overlay,
.dynamic-grid-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: -1;
  background-image: 
    linear-gradient(rgba(56, 189, 248, 0.022) 1px, transparent 1px),
    linear-gradient(90deg, rgba(56, 189, 248, 0.022) 1px, transparent 1px);
  background-size: 64px 64px;
  pointer-events: none;
  opacity: 0.75;
}

/* 宇宙深空暗夜遮罩 (保证所有文字清晰可读) */
.cosmos-vignette,
.dynamic-vignette {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: -1;
  background: radial-gradient(ellipse at center, transparent 32%, rgba(2, 6, 15, 0.88) 100%);
  pointer-events: none;
}

/* ==========================================================================
   全局布局容器与基础样式
   ========================================================================== */
.container {
  width: 100%;
  max-width: 1240px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

.section {
  padding: 86px 0;
  position: relative;
}

.section-alt {
  background-color: rgba(10, 17, 32, 0.65);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.section-header {
  text-align: center;
  max-width: 820px;
  margin: 0 auto 56px;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(0, 242, 254, 0.12);
  border: 1px solid rgba(0, 242, 254, 0.35);
  color: var(--accent-cyan);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  margin-bottom: 16px;
}

.section-title {
  font-size: clamp(26px, 3.5vw, 38px);
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 16px;
  background: linear-gradient(135deg, #ffffff 30%, #e0f2fe 70%, #38bdf8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.section-desc {
  font-size: 16px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ==========================================================================
   按钮组件 (严格实现 CTA 视觉规范)
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 700;
  font-size: 15px;
  padding: 12px 24px;
  border-radius: var(--radius-full);
  text-decoration: none;
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  cursor: pointer;
  white-space: nowrap;
  border: none;
}

.btn-primary {
  background: linear-gradient(135deg, #00f2fe 0%, #38bdf8 50%, #2563eb 100%);
  color: #030816;
  box-shadow: 0 4px 18px rgba(0, 242, 254, 0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 26px rgba(0, 242, 254, 0.6);
  color: #000;
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.06);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.16);
  backdrop-filter: blur(8px);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  transform: translateY(-2px);
}

.btn-block {
  width: 100%;
}

/* ==========================================================================
   顶部导航栏 (包含左上方品牌专属 Logo)
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(5, 9, 19, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  transition: background-color 0.3s ease;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 74px;
}

.header-logo-link {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  transition: transform 0.2s ease;
}

.header-logo-link:hover {
  transform: scale(1.02);
}

.header-logo-img {
  height: 44px;
  width: auto;
  display: block;
}

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

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 15px;
  font-weight: 600;
  transition: color 0.2s ease;
}

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

.header-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

/* ==========================================================================
   Hero 主首屏区
   ========================================================================== */
.hero-section {
  padding: 80px 0 60px;
  position: relative;
  text-align: center;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(16, 185, 129, 0.12);
  border: 1px solid rgba(16, 185, 129, 0.35);
  color: #34d399;
  font-size: 13px;
  font-weight: 700;
  padding: 6px 16px;
  border-radius: var(--radius-full);
  margin-bottom: 24px;
}

.pulse-dot {
  width: 8px;
  height: 8px;
  background-color: #10b981;
  border-radius: 50%;
  box-shadow: 0 0 10px #10b981;
  animation: pulseAnim 2s infinite;
}

@keyframes pulseAnim {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.8); }
}

.hero-title {
  font-size: clamp(32px, 5vw, 54px);
  font-weight: 900;
  line-height: 1.22;
  letter-spacing: -0.5px;
  margin-bottom: 20px;
}

.hero-title-highlight {
  background: linear-gradient(135deg, #00f2fe 0%, #38bdf8 50%, #60a5fa 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: clamp(16px, 2vw, 19px);
  color: var(--text-secondary);
  max-width: 840px;
  margin: 0 auto 36px;
  line-height: 1.75;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}

.hero-stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  max-width: 980px;
  margin: 0 auto;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 18px 14px;
  text-align: center;
  backdrop-filter: blur(10px);
}

.stat-value {
  font-size: 26px;
  font-weight: 900;
  color: var(--accent-cyan);
  margin-bottom: 4px;
}

.stat-label {
  font-size: 13px;
  color: var(--text-secondary);
}

/* ==========================================================================
   晚高峰实测数据矩阵表格
   ========================================================================== */
.speed-matrix-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  backdrop-filter: blur(10px);
}

.speed-matrix-table th,
.speed-matrix-table td {
  padding: 16px 20px;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
  font-size: 14px;
}

.speed-matrix-table th {
  background: rgba(255, 255, 255, 0.04);
  font-weight: 700;
  color: var(--text-primary);
  text-transform: uppercase;
  font-size: 12px;
  letter-spacing: 0.8px;
}

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

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

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  font-size: 12px;
  font-weight: 700;
}

.status-badge.green {
  background: rgba(16, 185, 129, 0.15);
  color: #34d399;
  border: 1px solid rgba(16, 185, 129, 0.3);
}

/* ==========================================================================
   核心特色优势卡片矩阵
   ========================================================================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px 26px;
  transition: all 0.3s ease;
  backdrop-filter: blur(10px);
}

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

.feature-icon-wrapper {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, rgba(0, 242, 254, 0.15), rgba(59, 130, 246, 0.2));
  border: 1px solid rgba(0, 242, 254, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  margin-bottom: 20px;
  color: var(--accent-cyan);
}

.feature-card h3 {
  font-size: 19px;
  font-weight: 800;
  margin-bottom: 12px;
  color: #ffffff;
}

.feature-card p {
  font-size: 14.5px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ==========================================================================
   价格方案区 (严格规范：所有价格要同排)
   ========================================================================== */
.pricing-section {
  position: relative;
}

.pricing-row-container {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 30px 22px;
  display: flex;
  flex-direction: column;
  transition: all 0.3s ease;
  position: relative;
  backdrop-filter: blur(12px);
}

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

/* 官方高亮推荐卡片 (旗舰款) */
.pricing-card.featured {
  background: linear-gradient(180deg, rgba(0, 242, 254, 0.1) 0%, rgba(12, 21, 38, 0.95) 100%);
  border: 2px solid var(--border-featured);
  box-shadow: var(--shadow-featured);
}

.pricing-card.featured:hover {
  border-color: var(--accent-cyan);
  box-shadow: 0 0 45px rgba(0, 242, 254, 0.55);
}

.plan-top-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, #00f2fe, #3b82f6);
  color: #030816;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.5px;
  padding: 4px 14px;
  border-radius: var(--radius-full);
  white-space: nowrap;
  box-shadow: 0 4px 12px rgba(0, 242, 254, 0.45);
}

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

.plan-tier-badge {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  color: var(--accent-cyan);
  background: rgba(0, 242, 254, 0.1);
  padding: 3px 10px;
  border-radius: var(--radius-full);
  margin-bottom: 10px;
}

.pricing-card.featured .plan-tier-badge {
  color: #ffffff;
  background: rgba(0, 242, 254, 0.25);
}

.plan-name {
  font-size: 22px;
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 6px;
}

.plan-target {
  font-size: 12.5px;
  color: var(--text-secondary);
  line-height: 1.5;
  min-height: 38px;
}

.pricing-figure {
  margin: 18px 0 10px;
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 2px;
}

.price-currency {
  font-size: 20px;
  font-weight: 700;
  color: var(--accent-cyan);
}

.price-num {
  font-size: 44px;
  font-weight: 900;
  line-height: 1;
  color: #ffffff;
}

.pricing-card.featured .price-num {
  background: linear-gradient(135deg, #ffffff, #00f2fe);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.price-cycle {
  font-size: 14px;
  color: var(--text-secondary);
  margin-left: 4px;
}

.pricing-features {
  list-style: none;
  margin: 18px 0 26px;
  padding: 0;
  flex-grow: 1;
}

.pricing-features li {
  font-size: 13.5px;
  color: var(--text-secondary);
  margin-bottom: 12px;
  display: flex;
  align-items: flex-start;
  gap: 8px;
  line-height: 1.5;
}

.pricing-features li strong {
  color: #ffffff;
}

.check-icon {
  color: var(--accent-cyan);
  font-weight: 900;
  font-size: 14px;
  flex-shrink: 0;
  margin-top: 1px;
}

.pricing-card-footer {
  margin-top: auto;
}

.pricing-tip {
  font-size: 12px;
  color: var(--text-muted);
  text-align: center;
  margin-top: 10px;
}

/* ==========================================================================
   机场评测与深度攻略文章卡片 (内部跳转)
   ========================================================================== */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 26px;
  display: flex;
  flex-direction: column;
  transition: all 0.3s ease;
  backdrop-filter: blur(10px);
  text-decoration: none;
  color: inherit;
}

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

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

.article-tag {
  font-size: 12px;
  font-weight: 700;
  color: var(--accent-cyan);
  background: rgba(0, 242, 254, 0.1);
  padding: 3px 10px;
  border-radius: var(--radius-full);
}

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

.article-card-title {
  font-size: 17.5px;
  font-weight: 800;
  line-height: 1.45;
  color: #ffffff;
  margin-bottom: 12px;
  transition: color 0.2s ease;
}

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

.article-card-desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 20px;
  flex-grow: 1;
}

.article-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
  color: var(--accent-cyan);
  font-weight: 700;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: 14px;
}

/* ==========================================================================
   客户端支持与生态矩阵
   ========================================================================== */
.clients-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}

.client-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 20px;
  text-align: center;
  transition: all 0.25s ease;
}

.client-item:hover {
  border-color: var(--accent-cyan);
  transform: translateY(-3px);
}

.client-icon {
  font-size: 32px;
  margin-bottom: 10px;
}

.client-name {
  font-weight: 700;
  font-size: 15px;
  color: #ffffff;
  margin-bottom: 4px;
}

.client-platform {
  font-size: 12px;
  color: var(--text-secondary);
}

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

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 26px;
  display: flex;
  flex-direction: column;
  transition: all 0.3s ease;
  backdrop-filter: blur(10px);
}

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

.review-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 14px;
}

.review-avatar {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: linear-gradient(135deg, #00f2fe, #3b82f6);
  color: #030816;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
}

.review-user-info {
  flex-grow: 1;
}

.review-name {
  font-weight: 800;
  font-size: 15px;
  color: #ffffff;
  display: flex;
  align-items: center;
  gap: 6px;
}

.review-badge-verified {
  font-size: 11px;
  font-weight: 700;
  color: #10b981;
  background: rgba(16, 185, 129, 0.12);
  padding: 2px 6px;
  border-radius: var(--radius-full);
}

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

.review-stars {
  color: #fbbf24;
  font-size: 14px;
  margin-bottom: 12px;
}

.review-text {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.65;
  flex-grow: 1;
}

.review-date {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 14px;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 10px;
}

/* ==========================================================================
   常见问题 FAQ (Pure CSS / Native Details HTML5 Accordion)
   ========================================================================== */
.faq-list {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  backdrop-filter: blur(10px);
  transition: border-color 0.25s ease;
}

.faq-item:hover {
  border-color: rgba(56, 189, 248, 0.35);
}

.faq-item[open] {
  border-color: var(--accent-cyan);
  box-shadow: 0 4px 18px rgba(0, 242, 254, 0.15);
}

.faq-question {
  padding: 20px 24px;
  font-weight: 700;
  font-size: 16.5px;
  color: #ffffff;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
  transition: color 0.2s ease;
}

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

.faq-question:hover {
  color: var(--accent-cyan);
}

.faq-icon {
  font-size: 20px;
  color: var(--accent-cyan);
  transition: transform 0.25s ease;
  line-height: 1;
}

.faq-item[open] .faq-icon {
  transform: rotate(45deg);
}

.faq-answer {
  padding: 0 24px 22px;
  font-size: 14.5px;
  color: var(--text-secondary);
  line-height: 1.75;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 16px;
}

.faq-answer strong {
  color: #ffffff;
}

/* ==========================================================================
   底栏与友情外链 (Footer & External Links)
   ========================================================================== */
.site-footer {
  background: rgba(4, 7, 15, 0.96);
  border-top: 1px solid var(--border-color);
  padding: 70px 0 36px;
  position: relative;
}

.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 40px;
  margin-bottom: 50px;
}

.footer-brand p {
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.7;
  margin-top: 16px;
  max-width: 320px;
}

.footer-col-title {
  font-size: 15px;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 18px;
  letter-spacing: 0.5px;
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 10px;
}

.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
  transition: color 0.2s ease;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.footer-links a:hover {
  color: var(--accent-cyan);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 30px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 13px;
  color: var(--text-muted);
}

.footer-keywords-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.kw-badge {
  font-size: 11.5px;
  color: var(--text-muted);
  background: rgba(255, 255, 255, 0.04);
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  text-decoration: none;
}

.kw-badge:hover {
  color: var(--accent-cyan);
  background: rgba(0, 242, 254, 0.08);
}

/* ==========================================================================
   响应式媒体查询
   ========================================================================== */
@media (max-width: 1080px) {
  .pricing-row-container {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }
  
  .features-grid,
  .articles-grid,
  .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .footer-top {
    grid-template-columns: 1fr 1fr;
    gap: 30px;
  }
}

@media (max-width: 768px) {
  .header-inner {
    height: 64px;
  }
  
  .main-nav {
    display: none;
  }
  
  .hero-stats-row {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .pricing-row-container {
    grid-template-columns: 1fr;
    max-width: 440px;
    margin: 0 auto;
  }
  
  .features-grid,
  .articles-grid,
  .reviews-grid,
  .clients-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-top {
    grid-template-columns: 1fr;
  }
  
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}