/* 全局变量 - 暗黑科技风 (Dark Tech / Cyberpunk) */
:root {
  --primary-color: #00e5ff;       /* 赛博青 / 霓虹蓝 */
  --primary-hover: #00b3cc;
  --secondary-color: #7000ff;     /* 霓虹紫 */
  --bg-color: #0a0e17;            /* 深邃夜空黑 */
  --bg-darker: #05070a;
  --surface-bg: rgba(20, 26, 38, 0.6); /* 玻璃态卡片背景 */
  --surface-border: rgba(0, 229, 255, 0.15);
  --text-main: #f8fafc;
  --text-light: #94a3b8;
  --font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --glow-shadow: 0 0 20px rgba(0, 229, 255, 0.3);
}

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

body {
  font-family: var(--font-family);
  background-color: var(--bg-color);
  color: var(--text-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  position: relative;
}

a { text-decoration: none; color: var(--primary-color); transition: var(--transition); }
a:hover { text-shadow: 0 0 8px rgba(0,229,255,0.5); }
ul { list-style: none; }
.container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 20px; z-index: 2; position: relative; }

/* --- 动态背景发光块 --- */
.bg-glow {
  position: absolute; width: 600px; height: 600px; border-radius: 50%;
  filter: blur(100px); z-index: 0; opacity: 0.15; pointer-events: none;
}
.bg-glow-1 { top: -200px; left: -100px; background: var(--primary-color); }
.bg-glow-2 { bottom: 20%; right: -200px; background: var(--secondary-color); }

/* --- 悬浮胶囊导航 (保留之前的改动并适配暗黑风) --- */
.header {
  background-color: rgba(10, 14, 23, 0.7);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(255,255,255,0.05);
  box-shadow: 0 10px 30px rgba(0,0,0,0.5);
  position: sticky;
  top: 20px;
  z-index: 1000;
  width: 92%;
  max-width: 1100px;
  margin: 0 auto;
  border-radius: 50px;
}

.nav { display: flex; justify-content: space-between; align-items: center; height: 70px; padding: 0 20px; }
.logo { font-size: 22px; font-weight: 800; color: var(--text-main); display: flex; align-items: center; gap: 8px; letter-spacing: 1px; }
.logo-icon { color: var(--primary-color); text-shadow: 0 0 10px var(--primary-color); }
.nav-links { display: flex; gap: 35px; }
.nav-links a { color: var(--text-light); font-weight: 500; font-size: 15px; }
.nav-links a:hover { color: var(--primary-color); }

/* --- 按钮样式 --- */
.btn-primary {
  background: linear-gradient(135deg, var(--primary-color) 0%, #0099ff 100%);
  color: #000 !important; /* 暗黑模式下的高对比度文字 */
  font-weight: 700;
  border-radius: 30px;
  text-align: center;
  border: none;
  cursor: pointer;
  box-shadow: 0 4px 15px rgba(0, 229, 255, 0.2);
}
.btn-primary:hover {
  box-shadow: 0 6px 20px rgba(0, 229, 255, 0.5);
  transform: translateY(-2px);
}
.btn-nav { padding: 8px 24px; font-size: 14px; }
.btn-large { padding: 15px 40px; font-size: 18px; display: inline-flex; align-items: center; gap: 10px; }
.btn-block { display: block; width: 100%; padding: 14px 0; font-size: 16px; margin-top: auto; }
.btn-outline {
  display: block; width: 100%; padding: 14px 0; font-size: 16px; text-align: center;
  border: 1px solid var(--surface-border); border-radius: 30px; color: var(--text-main);
  background: rgba(255,255,255,0.05); margin-top: auto; font-weight: 600;
}
.btn-outline:hover { background: rgba(255,255,255,0.1); border-color: var(--primary-color); color: var(--primary-color); }

/* --- 玻璃态卡片公用类 --- */
.glass-panel {
  background: var(--surface-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--surface-border);
  border-radius: 16px;
  transition: var(--transition);
}
.glass-panel:hover {
  border-color: rgba(0,229,255,0.4);
  box-shadow: 0 10px 30px rgba(0,0,0,0.3), inset 0 0 20px rgba(0,229,255,0.05);
  transform: translateY(-5px);
}

/* --- 主视觉区 (Hero) --- */
.hero { padding: 100px 0 80px; position: relative; text-align: center; min-height: 80vh; display: flex; align-items: center; }
.badge-tech {
  display: inline-block; padding: 6px 16px; background: rgba(0,229,255,0.1); border: 1px solid rgba(0,229,255,0.3);
  color: var(--primary-color); border-radius: 50px; font-size: 14px; font-weight: 600; margin-bottom: 25px;
  letter-spacing: 1px;
}
.hero h1 { font-size: 54px; font-weight: 900; margin-bottom: 25px; line-height: 1.2; text-shadow: 0 0 40px rgba(0,229,255,0.3); }
.hero p { font-size: 18px; color: var(--text-light); max-width: 700px; margin: 0 auto 40px; }
.hero-actions { display: flex; justify-content: center; gap: 20px; }

/* 背景网格 */
.cyber-grid {
  position: absolute; bottom: 0; left: 0; width: 100%; height: 50%;
  background-image: linear-gradient(rgba(0, 229, 255, 0.1) 1px, transparent 1px),
  linear-gradient(90deg, rgba(0, 229, 255, 0.1) 1px, transparent 1px);
  background-size: 40px 40px;
  transform: perspective(500px) rotateX(60deg);
  transform-origin: bottom; opacity: 0.3; z-index: 1; pointer-events: none;
}

/* --- 核心优势区 --- */
.section { padding: 100px 0; position: relative; z-index: 2; }
.bg-darker { background-color: var(--bg-darker); border-top: 1px solid rgba(255,255,255,0.02); border-bottom: 1px solid rgba(255,255,255,0.02); }
.section-header { text-align: center; margin-bottom: 60px; }
.section-header h2 { font-size: 36px; font-weight: 700; margin-bottom: 15px; }
.divider { width: 60px; height: 4px; background: var(--primary-color); margin: 0 auto; border-radius: 2px; box-shadow: var(--glow-shadow); }

.features-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 30px; }
.feature-card { padding: 40px 30px; text-align: center; }
.icon-wrapper { width: 70px; height: 70px; margin: 0 auto 25px; border-radius: 20px; display: flex; align-items: center; justify-content: center; font-size: 32px; background: rgba(255,255,255,0.05); }
.neon-blue { color: #00e5ff; box-shadow: 0 0 20px rgba(0,229,255,0.2); border: 1px solid rgba(0,229,255,0.3); }
.neon-purple { color: #b05cff; box-shadow: 0 0 20px rgba(176,92,255,0.2); border: 1px solid rgba(176,92,255,0.3); }
.neon-cyan { color: #00ffaa; box-shadow: 0 0 20px rgba(0,255,170,0.2); border: 1px solid rgba(0,255,170,0.3); }
.feature-card h3 { font-size: 22px; margin-bottom: 15px; }
.feature-card p { color: var(--text-light); }

/* 流媒体与AI */
.mt-5 { margin-top: 50px; }
.media-ai { padding: 30px; display: flex; align-items: center; justify-content: space-around; flex-wrap: wrap; gap: 20px; }
.media-ai-item { display: flex; align-items: center; gap: 10px; font-weight: 600; font-size: 16px; color: var(--text-main); }
.media-ai-item span { font-size: 24px; }

/* --- 价格表 --- */
.pricing-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 30px; align-items: stretch; }
.price-card { padding: 50px 40px; display: flex; flex-direction: column; position: relative; }
.price-card.popular { border-color: var(--primary-color); box-shadow: 0 0 30px rgba(0,229,255,0.1); transform: scale(1.05); }
.price-card.popular:hover { transform: scale(1.05) translateY(-5px); }
.popular-badge {
  position: absolute; top: -15px; left: 50%; transform: translateX(-50%);
  background: var(--primary-color); color: #000; padding: 6px 20px; border-radius: 30px;
  font-size: 14px; font-weight: 700; box-shadow: var(--glow-shadow);
}
.price-header { text-align: center; margin-bottom: 30px; border-bottom: 1px solid var(--surface-border); padding-bottom: 30px; }
.price-title { font-size: 20px; color: var(--text-light); margin-bottom: 15px; }
.price-amount { font-size: 48px; font-weight: 800; }
.price-amount span { font-size: 16px; color: var(--text-light); font-weight: 400; }
.glow-text { color: var(--primary-color); text-shadow: 0 0 15px rgba(0,229,255,0.4); }
.price-features { margin-bottom: 40px; flex-grow: 1; }
.price-features li { margin-bottom: 16px; color: var(--text-light); display: flex; align-items: center; gap: 12px; }
.price-features li::before { content: "✓"; color: var(--primary-color); font-weight: bold; background: rgba(0,229,255,0.1); width: 24px; height: 24px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 12px; }

/* --- SEO 文章专区 --- */
.articles-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 25px; }
.article-card { padding: 25px; }
.article-card h3 { font-size: 18px; margin-bottom: 12px; line-height: 1.4; }
.article-card h3 a { color: var(--text-main); }
.article-card h3 a:hover { color: var(--primary-color); }
.article-card p { font-size: 14px; color: var(--text-light); margin-bottom: 20px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.read-more { font-size: 14px; font-weight: 600; display: inline-flex; align-items: center; gap: 5px; }

/* --- 常见问题 --- */
.faq-list { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 20px; }
.faq-item { padding: 25px 30px; }
.faq-q { display: flex; align-items: center; gap: 15px; margin-bottom: 15px; }
.q-icon { font-size: 24px; font-weight: 900; color: var(--primary-color); }
.faq-q h3 { font-size: 20px; }
.faq-a { padding-left: 39px; color: var(--text-light); }

/* --- 页脚 --- */
.footer { background: #020305; padding: 60px 0 30px; border-top: 1px solid #111; }
.footer-nav { display: flex; justify-content: center; gap: 30px; margin-bottom: 40px; flex-wrap: wrap; }
.footer-nav a { color: var(--text-light); font-size: 15px; }
.footer-nav a:hover { color: var(--primary-color); }
.footer-bottom { text-align: center; border-top: 1px solid #1a1a1a; padding-top: 30px; font-size: 14px; color: #555; }
.pbn-links { margin-top: 15px; }
.pbn-links a { color: #666; margin: 0 10px; transition: color 0.3s; }
.pbn-links a:hover { color: #aaa; text-shadow: none; }

/* --- 响应式 --- */
@media (max-width: 992px) {
  .hero h1 { font-size: 40px; }
  .price-card.popular { transform: none; }
  .price-card.popular:hover { transform: translateY(-5px); }
}
@media (max-width: 768px) {
  .header { width: 95%; border-radius: 20px; top: 10px; }
  .nav { padding: 0 15px; }
  .nav-links { display: none; /* 移动端精简菜单 */ }
  .hero { padding: 80px 0 60px; }
  .hero h1 { font-size: 32px; }
  .cyber-grid { height: 30%; }
  .features-grid { grid-template-columns: 1fr; }
  .pricing-grid { grid-template-columns: 1fr; }
  .faq-a { padding-left: 0; margin-top: 10px; }
}