/* ===================================================================
   鲤云 LiYun - 极速轻量原生样式表 (Pure Native CSS)
   主题风格：卫星鲤跃 + 星链鳞光 + 太空科技
   配色规范：
   - 主背景：#020617 太空黑
   - 主色：#3B82F6 卫星蓝
   - 次色：#FCD34D 鳞光黄
   - 文字：#FFFFFF / rgba(255,255,255,0.5)
   =================================================================== */

/* 原生字体栈定义：无外部网络阻断、纯本地秒开渲染 */
:root {
  --bg-primary: #020617;
  --bg-secondary: #0a1128;
  --bg-card: rgba(10, 17, 40, 0.75);
  --bg-card-hover: rgba(19, 31, 68, 0.85);
  --border-color: rgba(59, 130, 246, 0.2);
  --border-glow: rgba(252, 211, 77, 0.45);
  
  --text-main: #FFFFFF;
  --text-muted: rgba(255, 255, 255, 0.75);
  --text-dim: rgba(255, 255, 255, 0.5);
  
  --primary: #3B82F6;         /* 卫星蓝 */
  --secondary: #FCD34D;       /* 鳞光黄 */
  --primary-hover: #60A5FA;
  --primary-gradient: linear-gradient(135deg, #3B82F6 0%, #60A5FA 50%, #FCD34D 100%);
  --accent-gold: #FCD34D;
  --accent-green: #10B981;
  
  --radius-btn: 8px;          /* 规定按钮圆角 8px */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  
  --shadow-sm: 0 4px 14px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 12px 36px -4px rgba(0, 0, 0, 0.6);
  --shadow-glow: 0 0 30px rgba(59, 130, 246, 0.35);
  
  --container-max: 1240px;
  --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  background-color: var(--bg-primary);
  position: relative;
}

/* ===================================================================
   背景动效层：全屏径向渐变顶部蓝辉光 + 底部黄辉光 + 细网格 + 卫星轨道
   =================================================================== */

.space-ambient-glow {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image: 
    radial-gradient(circle at 50% -10%, rgba(59, 130, 246, 0.35) 0%, transparent 55%),
    radial-gradient(circle at 50% 110%, rgba(252, 211, 77, 0.22) 0%, transparent 55%);
}

.space-grid-overlay {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  background-image: 
    linear-gradient(to right, rgba(59, 130, 246, 0.04) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(59, 130, 246, 0.04) 1px, transparent 1px);
  background-size: 40px 40px;
  mask-image: radial-gradient(ellipse at center, black 40%, transparent 85%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 40%, transparent 85%);
}

.space-orbits-svg {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1;
}

/* 轨道流动动画 */
.orbit-line {
  stroke-dasharray: 10 14;
  animation: orbitFlow 25s linear infinite;
}

.orbit-line.reverse {
  stroke-dasharray: 8 12;
  animation: orbitFlowReverse 30s linear infinite;
}

@keyframes orbitFlow {
  from { stroke-dashoffset: 0; }
  to { stroke-dashoffset: -1000; }
}

@keyframes orbitFlowReverse {
  from { stroke-dashoffset: 0; }
  to { stroke-dashoffset: 1000; }
}

/* 卫星粒子按椭圆轨迹飞行 (20秒一周期) */
.satellite-particle {
  position: fixed;
  border-radius: 50%;
  pointer-events: none;
  z-index: 2;
}

.satellite-blue {
  width: 10px;
  height: 10px;
  background: var(--primary);
  box-shadow: 0 0 18px 4px rgba(59, 130, 246, 0.9), 0 0 35px var(--primary);
  offset-path: path("M 100 200 C 500 50, 1100 600, 1500 250 C 1800 50, 2100 450, 2500 200");
  animation: flyParticle 20s linear infinite;
}

.satellite-yellow {
  width: 8px;
  height: 8px;
  background: var(--secondary);
  box-shadow: 0 0 16px 4px rgba(252, 211, 77, 0.9), 0 0 30px var(--secondary);
  offset-path: path("M 2400 650 C 1900 850, 1300 400, 900 700 C 500 900, 100 550, -100 600");
  animation: flyParticle 20s linear infinite;
}

@keyframes flyParticle {
  0% { offset-distance: 0%; opacity: 0; }
  10% { opacity: 1; }
  90% { opacity: 1; }
  100% { offset-distance: 100%; opacity: 0; }
}

/* 星点闪烁动画 */
@keyframes starTwinkle {
  0%, 100% { opacity: 0.2; transform: scale(0.8); }
  50% { opacity: 1; transform: scale(1.3); }
}

.star {
  animation: starTwinkle 3s ease-in-out infinite;
}

/* 通用容器 */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
  position: relative;
  z-index: 5;
}

.section {
  padding: 88px 0;
  position: relative;
  z-index: 5;
}

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

ul {
  list-style: none;
}

/* 标题通用组件 */
.section-header {
  text-align: center;
  max-width: 780px;
  margin: 0 auto 56px auto;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: rgba(59, 130, 246, 0.12);
  border: 1px solid rgba(59, 130, 246, 0.35);
  color: var(--primary);
  font-size: 0.85rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  margin-bottom: 18px;
  letter-spacing: 0.8px;
  box-shadow: 0 0 15px rgba(59, 130, 246, 0.2);
}

.badge.gold {
  background: rgba(252, 211, 77, 0.12);
  border-color: rgba(252, 211, 77, 0.35);
  color: var(--secondary);
}

.section-title {
  font-size: 2.25rem;
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 16px;
  letter-spacing: -0.5px;
  color: var(--text-main);
}

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

.gradient-text {
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* ===================================================================
   CTA 按钮规范：蓝色渐变按钮，圆角 8px，带 30px 蓝色辉光，hover 时光晕扩大
   =================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-size: 1rem;
  font-weight: 600;
  padding: 13px 28px;
  border-radius: var(--radius-btn); /* 严格为圆角 8px */
  cursor: pointer;
  border: 1px solid transparent;
  transition: var(--transition);
  min-height: 48px;
  text-align: center;
}

.btn-primary {
  background: linear-gradient(135deg, #1D4ED8 0%, #3B82F6 50%, #60A5FA 100%);
  color: #FFFFFF;
  box-shadow: 0 0 30px rgba(59, 130, 246, 0.6); /* 30px 蓝色辉光 */
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 48px rgba(59, 130, 246, 0.95), 0 0 20px var(--secondary); /* hover 光晕扩大 */
  border-color: var(--secondary);
  filter: brightness(1.1);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-main);
  border: 1px solid var(--border-color);
  backdrop-filter: blur(10px);
  border-radius: var(--radius-btn);
}

.btn-secondary:hover {
  background: rgba(59, 130, 246, 0.12);
  border-color: var(--secondary);
  box-shadow: 0 0 24px rgba(252, 211, 77, 0.35);
  transform: translateY(-2px);
}

.btn-block {
  width: 100%;
}

/* 顶部导航栏 */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(2, 6, 23, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  height: 76px;
  display: flex;
  align-items: center;
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text-main);
  font-family: 'Orbitron', sans-serif;
  letter-spacing: 0.5px;
}

.logo-icon {
  width: 38px;
  height: 38px;
  border-radius: 8px;
  background: var(--primary-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #020617;
  box-shadow: 0 0 20px rgba(59, 130, 246, 0.5);
}

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

.nav-link {
  font-size: 0.95rem;
  color: var(--text-muted);
  font-weight: 500;
}

.nav-link:hover {
  color: var(--secondary);
  text-shadow: 0 0 12px rgba(252, 211, 77, 0.5);
}

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

/* ===================================================================
   主视觉 Hero 区域规范：
   左侧：H1「鲤云」使用 Orbitron 800 字重，蓝到黄渐变 + 双层文字阴影 + 简介
   右侧：340×340px 全息地球网格 SVG + 6 发光卫星节点 + 4 数据链路 + 锦鲤鲤跃动画 + 4角数据标签
   =================================================================== */

.hero {
  padding: 80px 0 70px 0;
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.25fr 0.95fr;
  align-items: center;
  gap: 48px;
}

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

/* H1「鲤云」使用 Orbitron 800 字重，蓝到黄渐变 + 双层文字阴影 */
.hero-title {
  font-family: 'Orbitron', sans-serif;
  font-weight: 800;
  font-size: 3.4rem;
  line-height: 1.15;
  margin-bottom: 22px;
  letter-spacing: -0.5px;
  background: linear-gradient(135deg, #3B82F6 0%, #60A5FA 45%, #FCD34D 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  text-shadow: 0 0 20px rgba(59, 130, 246, 0.65), 0 0 45px rgba(252, 211, 77, 0.35);
}

.hero-subtitle {
  font-size: 1.06rem;
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 36px;
}

.hero-cta {
  display: flex;
  align-items: center;
  gap: 18px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

/* 右侧：340×340px 全息地球网格与锦鲤跃动组件 */
.hero-visual-wrapper {
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
}

.holo-earth-box {
  width: 340px;
  height: 340px;
  position: relative;
  background: radial-gradient(circle at center, rgba(59, 130, 246, 0.08) 0%, rgba(2, 6, 23, 0.4) 70%, transparent 100%);
  border: 1px solid rgba(59, 130, 246, 0.25);
  border-radius: var(--radius-lg);
  box-shadow: 0 0 40px rgba(59, 130, 246, 0.2), inset 0 0 30px rgba(59, 130, 246, 0.1);
  overflow: visible;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* 4 个角落等宽字体数据标签 */
.tag-sat {
  position: absolute;
  font-family: 'Courier New', Courier, monospace;
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 1px;
  padding: 2px 6px;
  background: rgba(2, 6, 23, 0.7);
  border: 1px solid rgba(59, 130, 246, 0.3);
  border-radius: 4px;
  z-index: 10;
  user-select: none;
}

.tag-tl { top: 10px; left: 10px; color: var(--primary); text-shadow: 0 0 8px var(--primary); }
.tag-tr { top: 10px; right: 10px; color: var(--secondary); text-shadow: 0 0 8px var(--secondary); }
.tag-bl { bottom: 10px; left: 10px; color: var(--secondary); text-shadow: 0 0 8px var(--secondary); }
.tag-br { bottom: 10px; right: 10px; color: #10B981; text-shadow: 0 0 8px #10B981; }

/* 全息地球 3D Y 轴旋转动画 (25秒一周期) */
.earth-3d-group {
  transform-origin: 170px 170px;
  animation: earthSpinY 25s linear infinite;
}

@keyframes earthSpinY {
  0% { transform: scaleX(1); }
  25% { transform: scaleX(0.2); }
  50% { transform: scaleX(-1); }
  75% { transform: scaleX(0.2); }
  100% { transform: scaleX(1); }
}

/* 数据链路流动动画 (模拟星链信号传输) */
.data-link-line {
  stroke-dasharray: 6 6;
  animation: linkSignalFlow 1.6s linear infinite;
}

@keyframes linkSignalFlow {
  from { stroke-dashoffset: 24; }
  to { stroke-dashoffset: 0; }
}

/* 锦鲤 SVG 鲤跃动画：左右摆动 + 缩放 (3秒一周期) + 双层 drop-shadow 辉光 */
.koi-fish-group {
  transform-origin: 170px 170px;
  filter: drop-shadow(0 0 10px rgba(59, 130, 246, 0.85)) drop-shadow(0 0 25px rgba(252, 211, 77, 0.75));
  animation: koiLeap 3s ease-in-out infinite alternate;
}

@keyframes koiLeap {
  0% {
    transform: translate(0, 4px) rotate(-9deg) scale(0.96);
  }
  50% {
    transform: translate(0, -6px) rotate(3deg) scale(1.06);
  }
  100% {
    transform: translate(0, -10px) rotate(9deg) scale(1.02);
  }
}

/* 信任指标网格 */
.hero-trust-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  max-width: 100%;
  margin-top: 40px;
  padding-top: 36px;
  border-top: 1px solid var(--border-color);
}

.trust-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 14px;
  background: rgba(10, 17, 40, 0.4);
  border: 1px solid rgba(59, 130, 246, 0.15);
  border-radius: var(--radius-sm);
}

.trust-num {
  font-family: 'Orbitron', sans-serif;
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--secondary);
  line-height: 1.2;
  margin-bottom: 4px;
  text-shadow: 0 0 14px rgba(252, 211, 77, 0.4);
}

.trust-label {
  font-size: 0.85rem;
  color: var(--text-dim);
}

/* 核心优势卡片（保持原排版 3 列卡片，视觉应用太空与鳞光质感） */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-card {
  background: var(--bg-card);
  backdrop-filter: blur(14px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 36px 30px;
  position: relative;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.feature-card:hover {
  transform: translateY(-6px);
  border-color: var(--secondary);
  box-shadow: 0 0 35px rgba(252, 211, 77, 0.25), 0 0 20px rgba(59, 130, 246, 0.3);
  background: var(--bg-card-hover);
}

.feature-icon-wrapper {
  width: 58px;
  height: 58px;
  border-radius: 8px;
  background: rgba(59, 130, 246, 0.15);
  border: 1px solid rgba(59, 130, 246, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  margin-bottom: 24px;
  box-shadow: 0 0 15px rgba(59, 130, 246, 0.3);
}

.feature-icon-wrapper.gold {
  background: rgba(252, 211, 77, 0.15);
  border-color: rgba(252, 211, 77, 0.4);
  color: var(--secondary);
  box-shadow: 0 0 15px rgba(252, 211, 77, 0.3);
}

.feature-title {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 14px;
  color: var(--text-main);
}

.feature-text {
  font-size: 0.96rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* 流媒体与 AI 支持图卡（保持原排版 2 列） */
.media-ai-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
  margin-bottom: 48px;
}

.category-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 36px;
  backdrop-filter: blur(14px);
  transition: var(--transition);
}

.category-card:hover {
  border-color: var(--secondary);
  box-shadow: 0 0 35px rgba(252, 211, 77, 0.25);
}

.category-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 20px;
}

.category-icon {
  width: 48px;
  height: 48px;
  border-radius: 8px;
  background: rgba(252, 211, 77, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--secondary);
  border: 1px solid rgba(252, 211, 77, 0.3);
}

.category-icon.blue {
  background: rgba(59, 130, 246, 0.15);
  color: var(--primary);
  border: 1px solid rgba(59, 130, 246, 0.3);
}

.category-title {
  font-size: 1.3rem;
  font-weight: 700;
}

.category-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-bottom: 24px;
  line-height: 1.6;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tag-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-color);
  padding: 8px 16px;
  border-radius: var(--radius-full);
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-main);
  transition: var(--transition);
}

.tag-pill:hover {
  background: rgba(59, 130, 246, 0.18);
  border-color: var(--secondary);
  color: var(--secondary);
  transform: translateY(-2px);
  box-shadow: 0 0 15px rgba(252, 211, 77, 0.3);
}

.tag-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--secondary);
  box-shadow: 0 0 10px var(--secondary);
}

/* 客户端支持条 */
.client-bar {
  background: rgba(10, 17, 40, 0.6);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 20px;
}

.client-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-muted);
}

.client-icons {
  display: flex;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
}

.client-badge {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.92rem;
  color: var(--text-main);
  font-weight: 500;
}

/* 套餐价格对比表（保持原排版 3 列卡片） */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  align-items: stretch;
}

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

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

.pricing-card.featured {
  background: linear-gradient(180deg, rgba(19, 31, 68, 0.9) 0%, rgba(10, 17, 40, 0.95) 100%);
  border: 2px solid var(--secondary);
  box-shadow: 0 0 45px rgba(252, 211, 77, 0.3), 0 0 25px rgba(59, 130, 246, 0.4);
  transform: scale(1.03);
}

.pricing-card.featured:hover {
  transform: scale(1.05) translateY(-4px);
}

.popular-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, #F59E0B 0%, #FCD34D 100%);
  color: #020617;
  font-size: 0.78rem;
  font-weight: 800;
  padding: 4px 18px;
  border-radius: var(--radius-full);
  box-shadow: 0 0 16px rgba(252, 211, 77, 0.6);
  letter-spacing: 0.5px;
}

.plan-name {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.plan-desc {
  font-size: 0.9rem;
  color: var(--text-dim);
  margin-bottom: 24px;
  min-height: 42px;
}

.plan-price-box {
  display: flex;
  align-items: baseline;
  margin-bottom: 28px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-color);
}

.plan-currency {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--secondary);
}

.plan-price {
  font-family: 'Orbitron', sans-serif;
  font-size: 3rem;
  font-weight: 800;
  line-height: 1;
  color: var(--text-main);
  margin: 0 4px;
  text-shadow: 0 0 20px rgba(255, 255, 255, 0.2);
}

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

.plan-features {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 36px;
  flex-grow: 1;
}

.plan-feature-item {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.92rem;
  color: var(--text-muted);
}

.plan-feature-item.active {
  color: var(--text-main);
}

.check-icon {
  width: 18px;
  height: 18px;
  color: var(--secondary);
  flex-shrink: 0;
}

/* 用户评价 */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 30px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: var(--transition);
}

.review-card:hover {
  border-color: var(--secondary);
  box-shadow: 0 0 20px rgba(252, 211, 77, 0.2);
  transform: translateY(-4px);
}

.review-stars {
  color: var(--secondary);
  margin-bottom: 14px;
  display: flex;
  gap: 4px;
  text-shadow: 0 0 8px rgba(252, 211, 77, 0.5);
}

.review-text {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 20px;
}

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

.user-avatar {
  width: 42px;
  height: 42px;
  border-radius: 8px;
  background: var(--primary-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: #020617;
  font-size: 0.9rem;
}

.user-name {
  font-size: 0.95rem;
  font-weight: 600;
}

.user-tag {
  font-size: 0.8rem;
  color: var(--text-dim);
}

/* FAQ 常见问答 */
.faq-list {
  max-width: 840px;
  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;
  transition: var(--transition);
}

.faq-item[open] {
  border-color: var(--secondary);
  background: var(--bg-card-hover);
  box-shadow: 0 0 20px rgba(252, 211, 77, 0.15);
}

.faq-question {
  padding: 22px 26px;
  font-size: 1.08rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  list-style: none;
  user-select: none;
}

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

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

.faq-item[open] .faq-icon {
  color: var(--secondary);
  transform: rotate(180deg);
}

.faq-answer {
  padding: 0 26px 22px 26px;
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.8;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 16px;
}

/* 底部 CTA 诱导区 */
.bottom-cta {
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.18) 0%, rgba(252, 211, 77, 0.12) 100%);
  border: 1px solid rgba(252, 211, 77, 0.35);
  border-radius: var(--radius-lg);
  padding: 60px 40px;
  text-align: center;
  margin-top: 40px;
  box-shadow: 0 0 40px rgba(59, 130, 246, 0.25);
}

.bottom-cta-title {
  font-family: 'Orbitron', sans-serif;
  font-size: 2.1rem;
  font-weight: 800;
  margin-bottom: 14px;
  background: linear-gradient(135deg, #FFFFFF 0%, #FCD34D 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.bottom-cta-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto 30px auto;
}

/* 页脚 - 严格仅保留四个指定标题 */
.footer {
  margin-top: auto;
  background: #01040f;
  border-top: 1px solid var(--border-color);
  padding: 48px 0 36px 0;
  position: relative;
  z-index: 5;
}

.footer-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 36px;
  margin-bottom: 28px;
  flex-wrap: wrap;
}

.footer-link {
  font-size: 1rem;
  color: var(--text-muted);
  font-weight: 500;
  padding: 6px 12px;
  border-radius: 8px;
  transition: var(--transition);
}

.footer-link:hover {
  color: var(--secondary);
  background: rgba(252, 211, 77, 0.08);
  box-shadow: 0 0 15px rgba(252, 211, 77, 0.2);
}

.footer-copyright {
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-dim);
}

/* 子页面独立通用排版 */
.page-header {
  padding: 60px 0 40px 0;
  text-align: center;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 48px;
}

.content-article {
  max-width: 860px;
  margin: 0 auto 80px auto;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 48px;
  line-height: 1.85;
}

.content-article h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--secondary);
  margin: 36px 0 16px 0;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
}

.content-article h2:first-of-type {
  margin-top: 0;
}

.content-article p {
  color: var(--text-muted);
  margin-bottom: 16px;
  font-size: 1rem;
}

.content-article ul, .content-article ol {
  color: var(--text-muted);
  margin: 12px 0 20px 24px;
}

.content-article li {
  margin-bottom: 10px;
}

.highlight-box {
  background: rgba(59, 130, 246, 0.08);
  border-left: 4px solid var(--secondary);
  padding: 18px 22px;
  border-radius: 0 8px 8px 0;
  margin: 20px 0;
  color: var(--text-main);
  box-shadow: 0 0 20px rgba(59, 130, 246, 0.15);
}

/* SEO 知识科普文章专栏样式 */
.article-toc-box {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px;
  margin-bottom: 48px;
  backdrop-filter: blur(14px);
  box-shadow: 0 0 30px rgba(59, 130, 246, 0.15);
}

.article-toc-title {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--secondary);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
}

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

.toc-link-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 16px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  font-size: 0.92rem;
  color: var(--text-muted);
  transition: var(--transition);
}

.toc-link-item:hover {
  background: rgba(59, 130, 246, 0.15);
  border-color: var(--secondary);
  color: var(--text-main);
  transform: translateX(4px);
}

.toc-badge {
  font-family: 'Orbitron', monospace;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--secondary);
  background: rgba(252, 211, 77, 0.15);
  padding: 2px 8px;
  border-radius: 4px;
}

.seo-article-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 44px;
  margin-bottom: 44px;
  backdrop-filter: blur(14px);
  transition: var(--transition);
  position: relative;
}

.seo-article-item:hover {
  border-color: rgba(59, 130, 246, 0.5);
  box-shadow: 0 0 35px rgba(59, 130, 246, 0.2);
}

.seo-article-item.highlight-liyun {
  border: 1.5px solid var(--secondary);
  box-shadow: 0 0 30px rgba(252, 211, 77, 0.2);
  background: linear-gradient(180deg, rgba(19, 31, 68, 0.8) 0%, rgba(10, 17, 40, 0.9) 100%);
}

.article-meta-bar {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 18px;
  font-size: 0.85rem;
  color: var(--text-dim);
  flex-wrap: wrap;
}

.article-meta-badge {
  color: var(--primary);
  background: rgba(59, 130, 246, 0.15);
  padding: 3px 10px;
  border-radius: 4px;
  font-weight: 600;
}

.article-heading {
  font-size: 1.75rem;
  font-weight: 800;
  line-height: 1.35;
  color: #FFFFFF;
  margin-bottom: 20px;
  letter-spacing: -0.5px;
}

.article-heading span {
  color: var(--secondary);
}

.article-body {
  color: var(--text-muted);
  font-size: 1rem;
  line-height: 1.85;
}

.article-body h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
  margin: 26px 0 12px 0;
  display: flex;
  align-items: center;
  gap: 8px;
}

.article-body p {
  margin-bottom: 16px;
}

.article-body strong {
  color: #FFFFFF;
  font-weight: 600;
}

.inline-link {
  color: var(--secondary);
  text-decoration: underline;
  text-underline-offset: 4px;
  font-weight: 600;
  transition: var(--transition);
}

.inline-link:hover {
  color: #FFFFFF;
  text-shadow: 0 0 10px var(--secondary);
}

.article-cta-card {
  margin-top: 26px;
  padding: 20px 24px;
  background: rgba(59, 130, 246, 0.08);
  border: 1px solid rgba(59, 130, 246, 0.3);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.article-faq-section {
  margin-top: 30px;
  padding-top: 26px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.article-faq-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--secondary);
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  gap: 8px;
}

@media (max-width: 768px) {
  .article-toc-grid {
    grid-template-columns: 1fr;
  }
  .seo-article-item {
    padding: 26px 18px;
  }
  .article-heading {
    font-size: 1.4rem;
  }
}

/* 网站地图样式 */
.sitemap-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-top: 24px;
}

.sitemap-group {
  background: rgba(10, 17, 40, 0.4);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
}

.sitemap-group-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--secondary);
  margin-bottom: 14px;
}

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

.sitemap-item-link {
  color: var(--text-muted);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.sitemap-item-link:hover {
  color: var(--secondary);
  transform: translateX(4px);
}

/* ===================================================================
   响应式适配 (Media Queries)
   =================================================================== */

@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .hero-left {
    text-align: center;
  }
  
  .hero-cta {
    justify-content: center;
  }
  
  .hero-title {
    font-size: 2.8rem;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
  
  .media-ai-grid {
    grid-template-columns: 1fr;
  }
  
  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 500px;
    margin: 0 auto;
  }
  
  .pricing-card.featured {
    transform: none;
  }
  
  .reviews-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .navbar {
    height: auto;
    padding: 14px 0;
  }
  
  .nav-container {
    flex-direction: column;
    gap: 14px;
  }
  
  .nav-links {
    display: none; /* 移动端突出品牌与主要注册入口 */
  }
  
  .hero {
    padding: 40px 0 30px 0;
  }
  
  .hero-title {
    font-size: 2.2rem;
  }
  
  .hero-cta {
    flex-direction: column;
    width: 100%;
  }
  
  .btn {
    width: 100%;
    padding: 14px 20px;
  }
  
  .hero-trust-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 14px;
  }
  
  .section {
    padding: 50px 0;
  }
  
  .section-title {
    font-size: 1.8rem;
  }
  
  .client-bar {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .footer-nav {
    flex-direction: column;
    gap: 16px;
  }
  
  .content-article {
    padding: 24px 18px;
  }
  
  .sitemap-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 1.85rem;
  }
  
  .holo-earth-box {
    transform: scale(0.9);
  }
  
  .plan-price {
    font-size: 2.5rem;
  }
}

/* ===================================================================
   无障碍与体验强化 (Accessibility, Focus, Scroll-Margin & Motion)
   =================================================================== */

/* 1. 键盘跳转入口 (Skip to content) */
.skip-link {
  position: absolute;
  top: -120px;
  left: 20px;
  z-index: 99999;
  padding: 12px 24px;
  background: var(--primary);
  color: #FFFFFF;
  font-weight: 700;
  border-radius: var(--radius-sm);
  text-decoration: none;
  box-shadow: 0 0 25px rgba(59, 130, 246, 0.8), 0 0 10px var(--secondary);
  transition: top 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.skip-link:focus {
  top: 20px;
  outline: 2px solid var(--secondary) !important;
  outline-offset: 3px !important;
}

/* 2. 吸顶导航遮挡修复 (导航高度约 76px，设置 90px 留白余量) */
section[id],
div[id^="art-"],
article[id^="art-"],
.article-card[id],
h2[id],
h3[id],
#main-content {
  scroll-margin-top: 90px;
}

/* 3. 键盘焦点可视化高亮 (WCAG 2.1 AA) */
a:focus-visible,
button:focus-visible,
summary:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--secondary) !important;
  outline-offset: 3px !important;
  border-radius: 4px;
}

/* 4. 减弱动态效果适配 (前庭障碍保护) */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .space-orbits-svg path,
  .mesh-globe,
  .mesh-link,
  .mesh-koi,
  .fly-particle,
  .space-star {
    animation: none !important;
  }
}

/* 5. 移动端触控尺寸保底 (不少于 44×44 CSS 像素) */
@media (max-width: 768px) {
  .btn,
  .navbar .btn {
    min-height: 44px !important;
    min-width: 44px !important;
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .nav-link {
    min-height: 44px;
    display: inline-flex;
    align-items: center;
  }
}

/* 6. 360px & 390px 极窄屏无溢出与布局保护 */
@media (max-width: 390px) {
  .container {
    padding-left: 12px;
    padding-right: 12px;
  }

  .hero-title {
    font-size: 1.65rem;
    word-break: break-word;
  }

  .btn {
    padding: 12px 18px;
    font-size: 0.95rem;
  }

  .holo-earth-box {
    transform: scale(0.8);
    transform-origin: center center;
  }
}