/* ===================================================================
   TNT云 (tntcloud) - 闪电链 · 高压电弧 · 电磁科技 主题样式表
   配色：主背景 #0A0E1A | 主色 #00F5FF 闪电青 | 次色 #A855F7 电弧紫
   零外部依赖 · 秒开加载 · 全端响应式 · 原生 CSS 变量与 GPU 动效驱动
   =================================================================== */

:root {
  /* 官方指定核心配色 */
  --bg-primary: #0A0E1A;         /* 深蓝黑主背景 */
  --bg-secondary: #0e1424;       /* 次级深色背景 */
  --bg-card: rgba(16, 23, 41, 0.8); /* 半透明高压电磁玻璃卡片 */
  --bg-card-hover: rgba(22, 33, 58, 0.92);
  --border-color: rgba(0, 245, 255, 0.15);
  --border-glow: rgba(0, 245, 255, 0.45);
  
  --primary: #00F5FF;            /* 闪电青 */
  --primary-hover: #38f8ff;
  --accent-purple: #A855F7;      /* 电弧紫 */
  --accent-purple-hover: #c084fc;
  
  /* 渐变与电弧光效 */
  --accent-gradient: linear-gradient(135deg, #00F5FF 0%, #A855F7 100%);
  --accent-gradient-hover: linear-gradient(135deg, #38f8ff 0%, #c084fc 100%);
  --arc-glow-cyan: 0 0 30px rgba(0, 245, 255, 0.55);
  --arc-glow-purple: 0 0 30px rgba(168, 85, 247, 0.5);
  
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  
  --success: #10b981;
  --card-radius: 16px;
  --btn-radius: 12px;           /* 规范指定：CTA 按钮圆角 12px */
  --container-max: 1240px;
}

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

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

body {
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  background-color: var(--bg-primary);
  background-image: 
    radial-gradient(circle at 18% 15%, rgba(0, 245, 255, 0.09) 0%, transparent 45%),
    radial-gradient(circle at 82% 28%, rgba(168, 85, 247, 0.09) 0%, transparent 45%),
    radial-gradient(circle at 50% 85%, rgba(0, 245, 255, 0.06) 0%, transparent 50%),
    linear-gradient(180deg, #0A0E1A 0%, #070a12 100%);
}

a {
  color: inherit;
  text-decoration: none;
}

img, svg {
  vertical-align: middle;
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

/* ==================== 背景动效：青/紫粒子从底部上升 ==================== */
.particle-field {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  overflow: hidden;
}

.particle {
  position: absolute;
  bottom: -20px;
  border-radius: 50%;
  opacity: 0;
  animation: particleRise linear infinite;
  will-change: transform, opacity;
}

.particle.cyan {
  background-color: #00F5FF;
  box-shadow: 0 0 10px #00F5FF, 0 0 20px rgba(0, 245, 255, 0.5);
}

.particle.purple {
  background-color: #A855F7;
  box-shadow: 0 0 10px #A855F7, 0 0 20px rgba(168, 85, 247, 0.5);
}

/* 粒子分布 */
.p1 { left: 8%;  width: 3px; height: 3px; animation-duration: 9s;  animation-delay: 0s; }
.p2 { left: 16%; width: 4px; height: 4px; animation-duration: 12s; animation-delay: 2.5s; }
.p3 { left: 24%; width: 2px; height: 2px; animation-duration: 8s;  animation-delay: 1.2s; }
.p4 { left: 33%; width: 5px; height: 5px; animation-duration: 14s; animation-delay: 4s; }
.p5 { left: 42%; width: 3px; height: 3px; animation-duration: 10s; animation-delay: 0.8s; }
.p6 { left: 51%; width: 4px; height: 4px; animation-duration: 11s; animation-delay: 3.2s; }
.p7 { left: 60%; width: 2px; height: 2px; animation-duration: 7.5s; animation-delay: 1.8s; }
.p8 { left: 69%; width: 4px; height: 4px; animation-duration: 13s; animation-delay: 5s; }
.p9 { left: 78%; width: 3px; height: 3px; animation-duration: 9.5s; animation-delay: 2.1s; }
.p10{ left: 87%; width: 5px; height: 5px; animation-duration: 15s; animation-delay: 3.8s; }
.p11{ left: 94%; width: 3px; height: 3px; animation-duration: 10.5s; animation-delay: 0.5s; }

@keyframes particleRise {
  0% {
    transform: translateY(0) scale(0.6);
    opacity: 0;
  }
  15% {
    opacity: 0.85;
  }
  85% {
    opacity: 0.85;
  }
  100% {
    transform: translateY(-105vh) scale(1.1);
    opacity: 0;
  }
}

header, main, footer {
  position: relative;
  z-index: 2;
}

/* ==================== 导航栏 ==================== */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  background: rgba(10, 14, 26, 0.88);
  border-bottom: 1px solid rgba(0, 245, 255, 0.16);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
  transition: all 0.3s ease;
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  color: #ffffff;
}

.brand-icon {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: var(--accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #0A0E1A;
  box-shadow: 0 0 16px rgba(0, 245, 255, 0.6);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-link {
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 500;
  transition: all 0.25s ease;
}

.nav-link:hover {
  color: var(--primary);
  text-shadow: 0 0 10px rgba(0, 245, 255, 0.6);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* ==================== CTA 按钮规范 ==================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  font-size: 0.96rem;
  font-weight: 700;
  border-radius: var(--btn-radius);
  transition: all 0.28s cubic-bezier(0.16, 1, 0.3, 1);
  cursor: pointer;
  white-space: nowrap;
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--accent-gradient);
  color: #0A0E1A;
  box-shadow: var(--arc-glow-cyan);
  letter-spacing: 0.2px;
}

.btn-primary:hover {
  background: var(--accent-gradient-hover);
  box-shadow: 0 0 45px rgba(0, 245, 255, 0.8), 0 0 20px rgba(168, 85, 247, 0.6);
  transform: translateY(-2px);
}

.btn-secondary {
  background: rgba(16, 23, 41, 0.8);
  border: 1px solid rgba(0, 245, 255, 0.3);
  color: #00F5FF;
  box-shadow: 0 0 15px rgba(0, 245, 255, 0.1);
}

.btn-secondary:hover {
  background: rgba(0, 245, 255, 0.12);
  border-color: #00F5FF;
  color: #ffffff;
  box-shadow: 0 0 24px rgba(0, 245, 255, 0.35);
  transform: translateY(-2px);
}

.btn-lg {
  padding: 15px 36px;
  font-size: 1.05rem;
}

.btn-block {
  width: 100%;
}

/* ==================== 视觉焦点与电弧标签 ==================== */
.badge-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: 9999px;
  background: rgba(0, 245, 255, 0.08);
  border: 1px solid rgba(0, 245, 255, 0.35);
  color: var(--primary);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 22px;
  box-shadow: 0 0 16px rgba(0, 245, 255, 0.2);
}

.pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--primary);
  box-shadow: 0 0 10px var(--primary);
  animation: arcPulse 1.8s infinite;
}

@keyframes arcPulse {
  0% { transform: scale(0.9); opacity: 0.6; box-shadow: 0 0 6px var(--primary); }
  50% { transform: scale(1.3); opacity: 1; box-shadow: 0 0 16px var(--primary), 0 0 25px var(--accent-purple); }
  100% { transform: scale(0.9); opacity: 0.6; box-shadow: 0 0 6px var(--primary); }
}

.gradient-text {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
  text-shadow: 0 0 25px rgba(0, 245, 255, 0.3);
}

/* ==================== 主视觉区 (Hero Layout & 右侧动画) ==================== */
.hero-section {
  padding: 70px 0 60px;
  position: relative;
}

.hero-main {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
  gap: 40px;
  margin-bottom: 54px;
}

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

.hero-title {
  font-size: 3.2rem;
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -1.2px;
  margin-bottom: 22px;
  color: #ffffff;
}

.hero-subtitle {
  font-size: 1.12rem;
  color: var(--text-muted);
  max-width: 640px;
  margin: 0 0 34px;
  line-height: 1.75;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
}

/* ==================== 【右侧动画】 ==================== */
.hero-graphic-container {
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  min-height: 400px;
}

.arc-reactor {
  width: 100%;
  max-width: 400px;
  height: 400px;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.reactor-svg {
  width: 100%;
  height: 100%;
  overflow: visible;
}

.orbit-outer {
  transform-origin: 200px 200px;
  animation: rotateClockwise 20s linear infinite;
}

.orbit-inner {
  transform-origin: 200px 200px;
  animation: rotateCounter 14s linear infinite;
}

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

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

.lightning-path {
  fill: none;
  stroke-dasharray: 24 16;
  animation: lightningDischarge 1.5s infinite ease-in-out;
}

.lightning-path.bolt-cyan {
  stroke: #00F5FF;
  filter: drop-shadow(0 0 8px #00F5FF) drop-shadow(0 0 16px rgba(0, 245, 255, 0.6));
}

.lightning-path.bolt-purple {
  stroke: #A855F7;
  filter: drop-shadow(0 0 8px #A855F7) drop-shadow(0 0 16px rgba(168, 85, 247, 0.6));
}

.bolt-1 { animation-delay: 0s; }
.bolt-2 { animation-delay: 0.35s; }
.bolt-3 { animation-delay: 0.7s; }
.bolt-4 { animation-delay: 1.05s; }

@keyframes lightningDischarge {
  0% { opacity: 0.2; stroke-dashoffset: 80; }
  20% { opacity: 1; stroke-dashoffset: 0; }
  35% { opacity: 0.4; }
  50% { opacity: 1; stroke-dashoffset: -40; }
  75% { opacity: 0.3; }
  85% { opacity: 0.95; stroke-dashoffset: -80; }
  100% { opacity: 0.2; stroke-dashoffset: -120; }
}

.vertex-pulse {
  animation: vertexNodePulse 1.5s infinite ease-in-out;
  transform-origin: center;
}

.vertex-cyan {
  fill: #00F5FF;
  filter: drop-shadow(0 0 12px #00F5FF);
}

.vertex-purple {
  fill: #A855F7;
  filter: drop-shadow(0 0 12px #A855F7);
}

@keyframes vertexNodePulse {
  0%, 100% { transform: scale(0.9); opacity: 0.5; }
  50% { transform: scale(1.4); opacity: 1; }
}

.arc-core-outer {
  transform-origin: 200px 200px;
  animation: coreBreathing 2s ease-in-out infinite;
  filter: drop-shadow(0 0 30px #00F5FF) drop-shadow(0 0 12px #FFFFFF);
}

@keyframes coreBreathing {
  0%, 100% {
    transform: scale(0.92);
    opacity: 0.75;
    filter: drop-shadow(0 0 20px #00F5FF) drop-shadow(0 0 8px #FFFFFF);
  }
  50% {
    transform: scale(1.1);
    opacity: 1;
    filter: drop-shadow(0 0 35px #00F5FF) drop-shadow(0 0 18px #FFFFFF) drop-shadow(0 0 45px rgba(0, 245, 255, 0.8));
  }
}

/* ==================== 关键数据背书 ==================== */
.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  padding: 24px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--card-radius);
  backdrop-filter: blur(12px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4), inset 0 0 20px rgba(0, 245, 255, 0.04);
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.stat-num {
  font-size: 1.85rem;
  font-weight: 800;
  color: #00F5FF;
  text-shadow: 0 0 15px rgba(0, 245, 255, 0.4);
  margin-bottom: 4px;
}

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

/* ==================== 通用章节头部 ==================== */
.section {
  padding: 90px 0;
}

.section-alt {
  background-color: var(--bg-secondary);
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 54px;
}

.section-tag {
  color: var(--primary);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  margin-bottom: 8px;
  display: block;
  text-shadow: 0 0 12px rgba(0, 245, 255, 0.5);
}

.section-title {
  font-size: 2.25rem;
  font-weight: 800;
  margin-bottom: 14px;
  letter-spacing: -0.5px;
  color: #ffffff;
}

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

/* ==================== 核心优势 (3个图文卡片) ==================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--card-radius);
  padding: 36px 30px;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
  overflow: hidden;
}

.feature-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-glow);
  transform: translateY(-5px);
  box-shadow: 0 12px 35px rgba(0, 0, 0, 0.5), 0 0 25px rgba(0, 245, 255, 0.15);
}

.feature-icon-wrapper {
  width: 58px;
  height: 58px;
  border-radius: 14px;
  background: rgba(0, 245, 255, 0.1);
  border: 1px solid rgba(0, 245, 255, 0.35);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  margin-bottom: 24px;
  box-shadow: 0 0 18px rgba(0, 245, 255, 0.25);
}

.feature-title {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: #ffffff;
}

.feature-text {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.65;
  margin-bottom: 20px;
}

.feature-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.feature-list li {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: #cbd5e1;
}

.feature-list svg {
  color: var(--primary);
  flex-shrink: 0;
}

/* ==================== 流媒体与 AI 支持图卡 ==================== */
.unlock-wrapper {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 30px;
}

.unlock-box {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--card-radius);
  padding: 36px 32px;
  position: relative;
}

.unlock-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 24px;
}

.unlock-header-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.unlock-stream .unlock-header-icon {
  background: rgba(168, 85, 247, 0.15);
  color: #A855F7;
  border: 1px solid rgba(168, 85, 247, 0.35);
  box-shadow: 0 0 16px rgba(168, 85, 247, 0.3);
}

.unlock-ai .unlock-header-icon {
  background: rgba(0, 245, 255, 0.15);
  color: #00F5FF;
  border: 1px solid rgba(0, 245, 255, 0.35);
  box-shadow: 0 0 16px rgba(0, 245, 255, 0.3);
}

.unlock-title {
  font-size: 1.3rem;
  font-weight: 700;
  color: #ffffff;
}

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

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

.unlock-item {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(0, 245, 255, 0.1);
  border-radius: 10px;
  padding: 14px 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  transition: all 0.25s ease;
}

.unlock-item:hover {
  background: rgba(0, 245, 255, 0.08);
  border-color: rgba(0, 245, 255, 0.35);
  transform: translateY(-2px);
  box-shadow: 0 0 15px rgba(0, 245, 255, 0.2);
}

.item-badge {
  font-size: 0.72rem;
  padding: 2px 7px;
  border-radius: 4px;
  background: rgba(0, 245, 255, 0.15);
  color: #00F5FF;
  margin-left: auto;
  font-weight: 600;
  border: 1px solid rgba(0, 245, 255, 0.3);
}

.unlock-name {
  font-size: 0.92rem;
  font-weight: 600;
  color: #e2e8f0;
}

/* ==================== 价格对比表 ==================== */
.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(--card-radius);
  padding: 38px 28px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.pricing-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-glow);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.5), 0 0 25px rgba(0, 245, 255, 0.2);
}

.pricing-card.popular {
  background: linear-gradient(180deg, rgba(22, 33, 58, 0.95) 0%, rgba(16, 23, 41, 0.95) 100%);
  border-color: #00F5FF;
  box-shadow: 0 10px 35px rgba(0, 0, 0, 0.5), 0 0 30px rgba(0, 245, 255, 0.25);
}

.popular-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--accent-gradient);
  color: #0A0E1A;
  padding: 4px 16px;
  font-size: 0.78rem;
  font-weight: 800;
  border-radius: 9999px;
  box-shadow: 0 0 20px rgba(0, 245, 255, 0.6);
}

.plan-name {
  font-size: 1.35rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 6px;
}

.plan-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 22px;
}

.plan-price {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 24px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-color);
}

.currency {
  font-size: 1.3rem;
  font-weight: 700;
  color: #00F5FF;
}

.amount {
  font-size: 3rem;
  font-weight: 800;
  line-height: 1;
  color: #ffffff;
}

.period {
  font-size: 0.9rem;
  color: var(--text-dim);
}

.plan-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 32px;
  flex-grow: 1;
}

.plan-features li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9rem;
  color: #cbd5e1;
}

.plan-features svg {
  color: #00F5FF;
  flex-shrink: 0;
}

/* ==================== 知识科普 3x3 九大板块网格 ==================== */
.wiki-grid-3x3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 50px;
}

.wiki-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--card-radius);
  padding: 26px 22px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
  overflow: hidden;
}

.wiki-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-glow);
  transform: translateY(-5px);
  box-shadow: 0 14px 35px rgba(0, 0, 0, 0.5), 0 0 25px rgba(0, 245, 255, 0.2);
}

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

.wiki-tag {
  font-size: 0.78rem;
  font-weight: 700;
  padding: 3px 9px;
  border-radius: 4px;
  letter-spacing: 0.5px;
}

.wiki-tag.cyan {
  color: var(--primary);
  background: rgba(0, 245, 255, 0.12);
  border: 1px solid rgba(0, 245, 255, 0.3);
}

.wiki-tag.purple {
  color: var(--accent-purple);
  background: rgba(168, 85, 247, 0.12);
  border: 1px solid rgba(168, 85, 247, 0.3);
}

.wiki-tag.green {
  color: #10b981;
  background: rgba(16, 185, 129, 0.12);
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.wiki-tag.amber {
  color: #f59e0b;
  background: rgba(245, 158, 11, 0.12);
  border: 1px solid rgba(245, 158, 11, 0.3);
}

.wiki-tag.red {
  color: #ef4444;
  background: rgba(239, 68, 68, 0.12);
  border: 1px solid rgba(239, 68, 68, 0.3);
}

.wiki-words {
  font-size: 0.78rem;
  color: var(--text-dim);
}

.wiki-title {
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.45;
  margin-bottom: 12px;
}

.wiki-title a {
  color: #ffffff;
  transition: color 0.2s ease;
}

.wiki-title a:hover {
  color: var(--primary);
  text-shadow: 0 0 10px rgba(0, 245, 255, 0.5);
}

.wiki-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 18px;
  flex-grow: 1;
}

.wiki-read-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--primary);
  font-size: 0.88rem;
  font-weight: 700;
  transition: gap 0.2s ease;
}

.wiki-read-btn:hover {
  gap: 10px;
  text-shadow: 0 0 10px rgba(0, 245, 255, 0.6);
}

/* ==================== 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(--card-radius);
  padding: 30px 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.stars {
  color: #fbbf24;
  margin-bottom: 14px;
  display: flex;
  gap: 4px;
  filter: drop-shadow(0 0 6px rgba(251, 191, 36, 0.4));
}

.review-quote {
  font-size: 0.95rem;
  color: #e2e8f0;
  line-height: 1.65;
  margin-bottom: 20px;
  flex-grow: 1;
}

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

.avatar-initial {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--accent-gradient);
  color: #0A0E1A;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1rem;
  box-shadow: 0 0 15px rgba(0, 245, 255, 0.5);
}

.author-info h4 {
  font-size: 0.92rem;
  color: #ffffff;
  font-weight: 600;
}

.author-info span {
  font-size: 0.78rem;
  color: var(--text-dim);
}

/* ==================== 常见问题 (FAQ 6个) ==================== */
.faq-container {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

details.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  overflow: hidden;
  transition: all 0.25s ease;
}

details.faq-item[open] {
  border-color: rgba(0, 245, 255, 0.5);
  background: var(--bg-card-hover);
  box-shadow: 0 0 20px rgba(0, 245, 255, 0.15);
}

summary.faq-question {
  padding: 20px 24px;
  font-size: 1.05rem;
  font-weight: 600;
  color: #ffffff;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
}

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

.faq-icon {
  width: 20px;
  height: 20px;
  transition: transform 0.25s ease;
  color: var(--text-dim);
}

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

.faq-answer {
  padding: 0 24px 22px;
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.7;
  border-top: 1px solid rgba(0, 245, 255, 0.08);
  padding-top: 16px;
}

/* ==================== 底部 CTA 横幅 ==================== */
.bottom-cta {
  padding: 60px 0;
  text-align: center;
}

.cta-box {
  background: linear-gradient(135deg, rgba(0, 245, 255, 0.12) 0%, rgba(16, 23, 41, 0.85) 50%, rgba(168, 85, 247, 0.12) 100%);
  border: 1px solid rgba(0, 245, 255, 0.35);
  border-radius: var(--card-radius);
  padding: 50px 30px;
  max-width: 960px;
  margin: 0 auto;
  box-shadow: 0 0 40px rgba(0, 245, 255, 0.15);
}

.cta-box h3 {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 12px;
  color: #ffffff;
}

.cta-box p {
  color: var(--text-muted);
  font-size: 1.05rem;
  margin-bottom: 28px;
}

/* ==================== 页脚规范 ==================== */
.footer {
  border-top: 1px solid rgba(0, 245, 255, 0.15);
  background: #070a12;
  padding: 40px 0;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 24px;
}

.footer-nav {
  display: flex;
  align-items: center;
  gap: 36px;
  list-style: none;
}

.footer-nav a {
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 500;
  transition: all 0.2s ease;
}

.footer-nav a:hover {
  color: var(--primary);
  text-decoration: underline;
  text-shadow: 0 0 10px rgba(0, 245, 255, 0.6);
}

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

/* ==================== 子页面通用样式 ==================== */
.page-wrapper {
  padding: 60px 0 100px;
  max-width: 860px;
  margin: 0 auto;
}

.page-wrapper-wide {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 50px 24px 100px;
}

.page-header {
  margin-bottom: 40px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-color);
}

.page-header h1 {
  font-size: 2.2rem;
  font-weight: 800;
  margin-bottom: 10px;
  color: #ffffff;
}

.page-content {
  color: #cbd5e1;
  font-size: 1rem;
  line-height: 1.8;
}

.page-content h2 {
  font-size: 1.4rem;
  font-weight: 700;
  color: #00F5FF;
  margin: 32px 0 14px;
  text-shadow: 0 0 10px rgba(0, 245, 255, 0.3);
}

.page-content h3 {
  font-size: 1.15rem;
  font-weight: 600;
  color: #f1f5f9;
  margin: 20px 0 10px;
}

.page-content p {
  margin-bottom: 16px;
  color: var(--text-muted);
}

.page-content ul, .page-content ol {
  margin-bottom: 20px;
  padding-left: 24px;
  color: var(--text-muted);
}

.page-content li {
  margin-bottom: 8px;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--primary);
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 24px;
  transition: all 0.2s ease;
}

.back-link:hover {
  text-shadow: 0 0 10px rgba(0, 245, 255, 0.6);
  text-decoration: underline;
}

/* ==================== 响应式适配 (@media) ==================== */
@media (max-width: 1024px) {
  .hero-main {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 30px;
  }

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

  .hero-subtitle {
    margin: 0 auto 34px;
  }

  .hero-actions {
    justify-content: center;
  }

  .features-grid,
  .pricing-grid,
  .reviews-grid,
  .wiki-grid-3x3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .hero-title {
    font-size: 2.3rem;
    letter-spacing: -0.5px;
  }
  
  .hero-subtitle {
    font-size: 1.05rem;
  }

  .nav-links {
    display: none;
  }

  .arc-reactor {
    max-width: 320px;
    height: 320px;
  }

  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    padding: 18px;
  }

  .features-grid,
  .unlock-wrapper,
  .pricing-grid,
  .reviews-grid,
  .wiki-grid-3x3 {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .unlock-grid {
    grid-template-columns: 1fr;
  }

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

  .hero-actions .btn {
    width: 100%;
    min-height: 48px;
  }

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

  .section {
    padding: 60px 0;
  }

  .section-title {
    font-size: 1.8rem;
  }
}

@media (max-width: 480px) {
  .hero-stats {
    grid-template-columns: 1fr;
  }
}

/* ==================== 无障碍与键盘访问 (Accessibility & Skip Link) ==================== */
.skip-link {
  position: absolute;
  top: -120px;
  left: 20px;
  z-index: 99999;
  background: var(--primary);
  color: #0A0E1A;
  padding: 10px 20px;
  border-radius: 8px;
  font-weight: 700;
  font-size: 0.95rem;
  box-shadow: 0 4px 20px rgba(0, 245, 255, 0.4);
  transition: top 0.2s ease-in-out;
  text-decoration: none;
}

.skip-link:focus,
.skip-link:focus-visible {
  top: 20px;
  outline: 2px solid #FFFFFF;
}

/* 键盘可访问焦点样式 (Focus Visible) */
a:focus-visible,
button:focus-visible,
summary:focus-visible,
input:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 3px;
}

/* 固定页眉锚点滚动内边距偏移 (避免遮挡标题) */
section[id],
div[id],
article[id],
h2[id],
h3[id] {
  scroll-margin-top: calc(var(--nav-height) + 24px);
}

/* 减弱动态效果 (prefers-reduced-motion) */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
  .particle,
  .lightning-path,
  .pulse-dot,
  .reactor-core {
    animation: none !important;
  }
}

/* 移动端触控热区至少 44x44 CSS 像素 */
@media (max-width: 768px) {
  .nav-links a,
  .footer-nav a {
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    padding: 8px 12px;
  }
  .faq-question {
    min-height: 48px;
  }
}