/* 
 * CSS - 瑗块儴鏁版嵁鏈哄満 
 * 椋庢牸: 绮捐嚧楂橀泤銆佹殫榛戙€佸ぇ灞忓ぇ鍥俱€佺幓鐠冩嫙鐗╁寲
 */

:root {
  --bg-color: #0b0f19; /* Deep dark blue */
  --bg-gradient: linear-gradient(135deg, #0b0f19 0%, #1a1f35 100%);
  --surface-color: rgba(255, 255, 255, 0.03);
  --surface-hover: rgba(255, 255, 255, 0.08);
  --border-color: rgba(255, 255, 255, 0.08);
  --text-primary: #ffffff;
  --text-secondary: #94a3b8;
  --accent-color: #00f2fe;
  --accent-gradient: linear-gradient(90deg, #4facfe 0%, #00f2fe 100%);
  --accent-glow: 0 0 20px rgba(0, 242, 254, 0.4);
  
  --font-ui: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-article: 'KaiTi', '妤蜂綋', STKaiti, serif; /* 姝ｆシ浣撶敤浜庢枃绔?*/
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-ui);
  background: var(--bg-color);
  background-image: var(--bg-gradient);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* 鏋佺畝瀵艰埅鏍?*/
.navbar {
  position: fixed;
  top: 0;
  width: 100%;
  padding: 20px 50px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 1000;
  transition: all 0.4s ease;
  backdrop-filter: blur(0px);
  background: transparent;
  border-bottom: 1px solid transparent;
}

.navbar.scrolled {
  padding: 15px 50px;
  background: rgba(11, 15, 25, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
}

.navbar-brand {
  font-size: 24px;
  font-weight: 700;
  color: var(--text-primary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 10px;
}

.navbar-brand span {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.navbar-nav {
  display: flex;
  gap: 30px;
  list-style: none;
}

.navbar-nav a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 15px;
  font-weight: 500;
  transition: color 0.3s ease;
  position: relative;
}

.navbar-nav a:hover,
.navbar-nav a.active {
  color: var(--text-primary);
}

.navbar-nav a::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-gradient);
  transition: width 0.3s ease;
}

.navbar-nav a:hover::after,
.navbar-nav a.active::after {
  width: 100%;
}

.nav-actions .btn-primary {
  padding: 10px 24px;
  border-radius: 30px;
  background: var(--surface-color);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  text-decoration: none;
  font-weight: 600;
  transition: all 0.3s ease;
}

.nav-actions .btn-primary:hover {
  background: var(--text-primary);
  color: var(--bg-color);
  box-shadow: 0 0 15px rgba(255, 255, 255, 0.3);
}

/* 鍏ㄥ睆澶у浘鑳屾櫙 Hero */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  padding: 0 20px;
}

/* 鍔ㄦ€佺偣缂€鐗规晥 */
.hero-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: url('https://images.unsplash.com/photo-1550751827-4bd374c3f58b?q=80&w=2070&auto=format&fit=crop') center/cover no-repeat;
  opacity: 0.15;
  z-index: -2;
}

.hero-glow-1 {
  position: absolute;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(0,242,254,0.15) 0%, rgba(0,0,0,0) 70%);
  top: -100px;
  right: -100px;
  z-index: -1;
  border-radius: 50%;
  animation: pulse 8s infinite alternate;
}

.hero-glow-2 {
  position: absolute;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(79,172,254,0.1) 0%, rgba(0,0,0,0) 70%);
  bottom: -150px;
  left: -150px;
  z-index: -1;
  border-radius: 50%;
  animation: pulse 6s infinite alternate-reverse;
}

@keyframes pulse {
  0% { transform: scale(1); opacity: 0.8; }
  100% { transform: scale(1.2); opacity: 0.4; }
}

.hero-content {
  text-align: center;
  max-width: 800px;
  z-index: 1;
}

.hero-tag {
  display: inline-block;
  padding: 6px 16px;
  background: rgba(0, 242, 254, 0.1);
  border: 1px solid rgba(0, 242, 254, 0.3);
  color: var(--accent-color);
  border-radius: 30px;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 24px;
  letter-spacing: 2px;
}

.hero-title {
  font-size: 64px;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 24px;
  letter-spacing: -1px;
}

.hero-subtitle {
  font-size: 20px;
  color: var(--text-secondary);
  margin-bottom: 40px;
  font-weight: 400;
}

.hero-actions {
  display: flex;
  gap: 20px;
  justify-content: center;
}

.btn-gradient {
  padding: 16px 40px;
  background: var(--accent-gradient);
  color: #fff;
  text-decoration: none;
  font-size: 18px;
  font-weight: 600;
  border-radius: 8px;
  transition: all 0.3s ease;
  box-shadow: var(--accent-glow);
  display: inline-block;
}

.btn-gradient:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(0, 242, 254, 0.6);
}

.btn-outline {
  padding: 16px 40px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  color: #fff;
  text-decoration: none;
  font-size: 18px;
  font-weight: 600;
  border-radius: 8px;
  transition: all 0.3s ease;
  backdrop-filter: blur(10px);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.2);
}

/* Sections Common */
section {
  padding: 100px 20px;
  max-width: 1200px;
  margin: 0 auto;
}

.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-title {
  font-size: 40px;
  font-weight: 700;
  margin-bottom: 16px;
}

.section-subtitle {
  color: var(--text-secondary);
  font-size: 18px;
}

/* 鏍稿績浼樺娍 */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
}

.feature-card {
  background: var(--surface-color);
  border: 1px solid var(--border-color);
  padding: 40px 30px;
  border-radius: 16px;
  backdrop-filter: blur(10px);
  transition: all 0.4s ease;
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(800px circle at var(--mouse-x) var(--mouse-y), rgba(255, 255, 255, 0.06), transparent 40%);
  opacity: 0;
  transition: opacity 0.3s ease;
  z-index: 1;
  pointer-events: none;
}

.feature-card:hover::before {
  opacity: 1;
}

.feature-card:hover {
  transform: translateY(-5px);
  border-color: rgba(255, 255, 255, 0.2);
  background: var(--surface-hover);
}

.feature-icon {
  font-size: 40px;
  color: var(--accent-color);
  margin-bottom: 20px;
  display: block;
}

.feature-card h3 {
  font-size: 24px;
  margin-bottom: 16px;
}

.feature-card p {
  color: var(--text-secondary);
}

/* 濂楅浠锋牸 (Pricing) */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  align-items: center;
}

.pricing-card {
  background: #18191c; /* from image 1 */
  border-radius: 16px;
  padding: 50px 30px;
  border: 1px solid transparent;
  transition: all 0.4s ease;
  position: relative;
}

.pricing-card:hover {
  transform: translateY(-10px);
}

.pricing-card.popular {
  border-color: #2dd4bf; /* cyan border from image */
  background: #111827;
  transform: scale(1.05);
  box-shadow: 0 0 40px rgba(45, 212, 191, 0.1);
}

.pricing-card.popular:hover {
  transform: scale(1.05) translateY(-10px);
}

.badge-popular {
  position: absolute;
  top: -15px;
  right: 30px;
  background: #2dd4bf;
  color: #000;
  padding: 6px 16px;
  border-radius: 20px;
  font-weight: 700;
  font-size: 14px;
}

.plan-name {
  color: #94a3b8;
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 20px;
}

.plan-price {
  font-size: 48px;
  font-weight: 800;
  color: #fff;
  margin-bottom: 30px;
  display: flex;
  align-items:baseline;
}

.plan-price span {
  font-size: 16px;
  color: #94a3b8;
  font-weight: 500;
  margin-left: 5px;
}

.plan-features {
  list-style: none;
  margin-bottom: 40px;
}

.plan-features li {
  color: #94a3b8;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.plan-features li::before {
  content: '鉁?;
  color: #8b5cf6; /* purple checkmark */
  font-weight: bold;
}

.plan-features b {
  color: #fff;
}

.btn-buy {
  display: block;
  width: 100%;
  padding: 16px;
  background: #2b2d31;
  color: #fff;
  text-align: center;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
  transition: all 0.3s ease;
}

.btn-buy:hover {
  background: #3f4248;
}

/* 鑺傜偣鍒楄〃 */
.nodes-marquee {
  width: 100%;
  overflow: hidden;
  white-space: nowrap;
  padding: 20px 0;
  background: var(--surface-color);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.nodes-marquee-content {
  display: inline-block;
  animation: marquee 30s linear infinite;
}

.node-item {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 24px;
  margin: 0 10px;
  background: rgba(255,255,255,0.05);
  border-radius: 30px;
  font-size: 14px;
  color: var(--text-secondary);
}

@keyframes marquee {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

/* FAQ */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  background: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  margin-bottom: 16px;
  overflow: hidden;
}

.faq-question {
  padding: 20px 24px;
  font-size: 18px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background 0.3s;
}

.faq-question:hover {
  background: var(--surface-hover);
}

.faq-answer {
  padding: 0 24px;
  max-height: 0;
  overflow: hidden;
  color: var(--text-secondary);
  transition: all 0.4s ease;
}

.faq-item.active .faq-answer {
  padding: 0 24px 20px 24px;
  max-height: 2000px; 
}

/* Footer */
footer {
  border-top: 1px solid var(--border-color);
  padding: 40px 20px;
  text-align: center;
  color: var(--text-secondary);
  background: #0b0f19;
}

footer .keywords {
  margin-bottom: 20px;
  font-size: 12px;
  opacity: 0.5;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
}

/* 鏂囩珷妯″潡鐗瑰畾鏍峰紡 */
.article-container {
  max-width: 800px;
  margin: 120px auto 60px;
  padding: 40px;
  background: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  backdrop-filter: blur(10px);
}

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

.article-title {
  font-size: 36px;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.article-meta {
  color: var(--text-secondary);
  font-size: 14px;
  display: flex;
  gap: 20px;
}

/* 浣跨敤瑕佹眰鐨勬妤蜂綋 */
.article-content {
  font-family: var(--font-article);
  font-size: 18px;
  line-height: 2;
  color: #e2e8f0;
}

.article-content p {
  margin-bottom: 20px;
  text-indent: 2em; /* 棣栬缂╄繘 */
}

.article-content h2, .article-content h3 {
  font-family: var(--font-ui); /* 鏍囬渚濈劧淇濈暀鐜颁唬鏃犺‖绾?*/
  margin: 40px 0 20px 0;
  color: #fff;
}

.article-faq {
  margin-top: 60px;
  padding-top: 40px;
  border-top: 1px dashed var(--border-color);
  font-family: var(--font-ui);
}

.internal-links {
  margin-top: 40px;
  padding: 20px;
  background: rgba(0,0,0,0.2);
  border-radius: 8px;
  font-family: var(--font-ui);
}

.internal-links h4 {
  margin-bottom: 10px;
}

.internal-links ul {
  list-style: none;
}

.internal-links li {
  margin-bottom: 8px;
}

.internal-links a {
  color: var(--accent-color);
  text-decoration: none;
}

.internal-links a:hover {
  text-decoration: underline;
}

/* 浼橀泤椤甸潰杩囨浮鍔ㄧ敾绫?*/
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: all 0.8s ease;
}

.reveal.active {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 900px) {
  .pricing-grid {
    grid-template-columns: 1fr;
  }
  .pricing-card.popular {
    transform: scale(1);
  }
  .pricing-card.popular:hover {
    transform: scale(1) translateY(-5px);
  }
  .hero-title {
    font-size: 40px;
  }
  .navbar-nav {
    display: none;
  }
}