/* ==========================================================================
   Stardust Cloud (星尘云) - Main Stylesheet
   Theme: Dark Cosmic Stardust, Glassmorphism, Neon Blue/Cyan Accents
   ========================================================================== */

:root {
  --bg-dark: #070a12;
  --bg-card: rgba(15, 23, 42, 0.65);
  --bg-card-hover: rgba(30, 41, 59, 0.85);
  --border-color: rgba(59, 130, 246, 0.2);
  --border-color-glow: rgba(96, 165, 250, 0.6);
  
  --primary-blue: #3b82f6;
  --primary-cyan: #06b6d4;
  --primary-accent: #60a5fa;
  --primary-purple: #8b5cf6;
  
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --transition-fast: 0.25s ease;
  --transition-normal: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  --radius-lg: 16px;
  --radius-md: 12px;
  --radius-sm: 8px;
}

/* Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-family: var(--font-family);
  background-color: var(--bg-dark);
  color: var(--text-main);
  line-height: 1.6;
  overflow-x: hidden;
}

body {
  position: relative;
  min-height: 100vh;
  background-color: #050811;
  background-image: 
    radial-gradient(circle at 50% -10%, rgba(99, 102, 241, 0.3) 0%, transparent 60%),
    radial-gradient(circle at 85% 45%, rgba(168, 85, 247, 0.22) 0%, transparent 50%),
    radial-gradient(circle at 15% 75%, rgba(14, 165, 233, 0.2) 0%, transparent 50%);
  background-attachment: fixed;
}

/* Stardust Background Canvas */
#stardust-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 0;
  pointer-events: none;
}

main {
  position: relative;
  z-index: 1;
}

/* Container */
.container {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Typography & Gradient Text */
.gradient-text {
  background: linear-gradient(135deg, #ffffff 0%, #93c5fd 40%, #3b82f6 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.gradient-text-subtle {
  background: linear-gradient(135deg, #e2e8f0 0%, #60a5fa 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Navigation Header */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  padding: 16px 0;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background: rgba(7, 10, 18, 0.75);
  border-bottom: 1px solid var(--border-color);
  transition: var(--transition-normal);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: -0.5px;
}

.brand-icon {
  width: 38px;
  height: 38px;
  background: transparent;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  filter: drop-shadow(0 0 12px rgba(99, 102, 241, 0.7));
}

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

.nav-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  transition: var(--transition-fast);
}

.nav-links a:hover {
  color: var(--text-main);
  text-shadow: 0 0 10px rgba(96, 165, 250, 0.5);
}

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: 99px;
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition-normal);
  border: none;
  outline: none;
}

.btn-primary {
  background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
  color: #ffffff;
  box-shadow: 0 4px 20px rgba(59, 130, 246, 0.4);
  position: relative;
  overflow: hidden;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(59, 130, 246, 0.7);
  background: linear-gradient(135deg, #60a5fa 0%, #3b82f6 100%);
}

.btn-secondary {
  background: rgba(30, 41, 59, 0.6);
  color: #93c5fd;
  border: 1px solid rgba(96, 165, 250, 0.3);
  backdrop-filter: blur(8px);
}

.btn-secondary:hover {
  background: rgba(59, 130, 246, 0.15);
  border-color: var(--primary-accent);
  color: #ffffff;
  transform: translateY(-2px);
  box-shadow: 0 4px 20px rgba(59, 130, 246, 0.25);
}

.btn-external {
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.2), rgba(59, 130, 246, 0.2));
  color: #c084fc;
  border: 1px solid rgba(168, 85, 247, 0.4);
}

.btn-external:hover {
  background: linear-gradient(135deg, #8b5cf6, #3b82f6);
  color: #ffffff;
  box-shadow: 0 4px 25px rgba(139, 92, 246, 0.5);
  transform: translateY(-2px);
}

/* Hero Section */
.hero {
  padding: 160px 0 90px;
  text-align: center;
  position: relative;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: 99px;
  background: rgba(59, 130, 246, 0.1);
  border: 1px solid rgba(96, 165, 250, 0.3);
  color: var(--primary-accent);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 24px;
  backdrop-filter: blur(8px);
}

.hero-badge .pulse-dot {
  width: 8px;
  height: 8px;
  background-color: #10b981;
  border-radius: 50%;
  box-shadow: 0 0 10px #10b981;
  animation: pulse 1.8s infinite;
}

@keyframes pulse {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
  70% { transform: scale(1.1); box-shadow: 0 0 0 8px rgba(16, 185, 129, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

.hero-title {
  font-size: clamp(2.4rem, 5vw, 4.2rem);
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: 20px;
  letter-spacing: -1px;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-muted);
  max-width: 720px;
  margin: 0 auto 36px;
  line-height: 1.7;
}

.hero-cta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  flex-wrap: wrap;
  margin-bottom: 50px;
}

/* Stats Counter Bar */
.stats-bar {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
  margin-top: 40px;
  padding: 28px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(12px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

.stat-item {
  text-align: center;
}

.stat-number {
  font-size: 2.2rem;
  font-weight: 800;
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* Section Common */
.section {
  padding: 90px 0;
}

.section-title {
  text-align: center;
  font-size: 2.2rem;
  font-weight: 800;
  margin-bottom: 14px;
}

.section-desc {
  text-align: center;
  color: var(--text-muted);
  max-width: 640px;
  margin: 0 auto 50px;
  font-size: 1.05rem;
}

/* Features Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 28px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: var(--transition-normal);
  backdrop-filter: blur(12px);
}

.feature-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-color-glow);
  box-shadow: 0 12px 30px rgba(59, 130, 246, 0.25);
  background: var(--bg-card-hover);
}

.feature-icon {
  width: 54px;
  height: 54px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.2), rgba(139, 92, 246, 0.2));
  border: 1px solid rgba(96, 165, 250, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary-accent);
  margin-bottom: 20px;
}

.feature-title {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: #fff;
}

.feature-text {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* Node Monitor Grid */
.nodes-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}

.node-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  backdrop-filter: blur(12px);
}

.node-info {
  display: flex;
  align-items: center;
  gap: 12px;
}

.node-flag {
  font-size: 1.5rem;
}

.node-name {
  font-weight: 700;
  color: #fff;
  font-size: 0.95rem;
}

.node-type {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.node-ping {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  color: #10b981;
  background: rgba(16, 185, 129, 0.1);
  padding: 4px 10px;
  border-radius: 99px;
  border: 1px solid rgba(16, 185, 129, 0.2);
}

/* Floating Pricing Section */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 28px;
  align-items: stretch;
}

.floating-card {
  animation: floatCard 6s ease-in-out infinite;
}

.floating-card:nth-child(2) {
  animation-delay: 1.5s;
}

.floating-card:nth-child(3) {
  animation-delay: 3s;
}

.floating-card:nth-child(4) {
  animation-delay: 4.5s;
}

@keyframes floatCard {
  0%, 100% {
    transform: translateY(0px);
  }
  50% {
    transform: translateY(-12px);
  }
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  position: relative;
  display: flex;
  flex-direction: column;
  backdrop-filter: blur(12px);
  transition: var(--transition-normal);
}

.pricing-card:hover {
  transform: translateY(-16px) scale(1.02);
  border-color: var(--border-color-glow);
  box-shadow: 0 20px 40px rgba(59, 130, 246, 0.35);
  background: var(--bg-card-hover);
  animation-play-state: paused;
}

.pricing-card.popular {
  border: 2px solid var(--primary-blue);
  box-shadow: 0 0 30px rgba(59, 130, 246, 0.3);
  background: rgba(20, 30, 55, 0.85);
}

.popular-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, #3b82f6, #8b5cf6);
  color: #fff;
  padding: 4px 16px;
  font-size: 0.8rem;
  font-weight: 700;
  border-radius: 99px;
  letter-spacing: 0.5px;
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.4);
}

.plan-name {
  font-size: 1.35rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 8px;
}

.plan-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.plan-price {
  font-size: 2.5rem;
  font-weight: 900;
  color: #fff;
  margin-bottom: 24px;
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.plan-price span {
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-muted);
}

.plan-features {
  list-style: none;
  margin-bottom: 32px;
  flex-grow: 1;
}

.plan-features li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.92rem;
  color: #cbd5e1;
  margin-bottom: 12px;
}

.plan-features svg {
  color: #10b981;
  flex-shrink: 0;
}

/* Articles Matrix */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 28px;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: var(--transition-normal);
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
}

.article-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-color-glow);
  box-shadow: 0 12px 30px rgba(59, 130, 246, 0.25);
  background: var(--bg-card-hover);
}

.article-tag {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--primary-accent);
  background: rgba(59, 130, 246, 0.15);
  padding: 4px 10px;
  border-radius: 99px;
  margin-bottom: 14px;
  align-self: flex-start;
}

.article-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 10px;
  line-height: 1.4;
}

.article-excerpt {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 20px;
  flex-grow: 1;
}

.article-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--text-dim);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 14px;
}

/* Reviews / Testimonials */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 28px;
}

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px;
  backdrop-filter: blur(12px);
}

.review-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 16px;
}

.review-avatar {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: linear-gradient(135deg, #3b82f6, #06b6d4);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: #fff;
}

.review-author {
  font-weight: 700;
  color: #fff;
}

.review-role {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.review-stars {
  color: #f59e0b;
  margin-bottom: 12px;
  display: flex;
  gap: 4px;
}

.review-content {
  color: #cbd5e1;
  font-size: 0.93rem;
  line-height: 1.6;
}

/* FAQ Accordion */
.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-fast);
}

.faq-question {
  padding: 22px 28px;
  font-size: 1.05rem;
  font-weight: 700;
  color: #fff;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
}

.faq-question:hover {
  background: rgba(59, 130, 246, 0.08);
}

.faq-answer {
  padding: 0 28px 22px;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.7;
  display: none;
}

.faq-item.active .faq-answer {
  display: block;
}

.faq-icon {
  transition: transform 0.3s ease;
}

.faq-item.active .faq-icon {
  transform: rotate(180deg);
}

/* Footer & PBN Area */
.site-footer {
  margin-top: 90px;
  padding: 40px 20px;
  background: rgba(4, 7, 13, 0.95);
  border-top: 1px solid rgba(59, 130, 246, 0.15);
  text-align: center;
}

.footer-content {
  max-width: 1000px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.footer-brand {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-main);
}

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

/* Footer PBN Link Pipe Zone - Subtle, Low-key, Elegant, Dofollow */
.footer-pbn-links {
  margin-top: 8px;
  padding-top: 12px;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  font-size: 0.78rem;
  color: var(--text-dim);
}

.footer-pbn-links span {
  opacity: 0.6;
}

.footer-pbn-links a {
  color: #64748b;
  text-decoration: none;
  transition: color 0.2s ease;
}

.footer-pbn-links a:hover {
  color: var(--primary-accent);
  text-decoration: underline;
}

/* Article Page Layout Styles */
.article-page {
  padding-top: 130px;
  max-width: 900px;
  margin: 0 auto;
}

.article-header {
  margin-bottom: 40px;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-dim);
  margin-bottom: 20px;
}

.breadcrumb a {
  color: var(--primary-accent);
  text-decoration: none;
}

.article-body {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 40px;
  backdrop-filter: blur(12px);
  color: #cbd5e1;
  font-size: 1.02rem;
  line-height: 1.85;
}

.article-body h2 {
  color: #fff;
  font-size: 1.6rem;
  margin: 36px 0 16px;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 10px;
}

.article-body h3 {
  color: #93c5fd;
  font-size: 1.3rem;
  margin: 28px 0 14px;
}

.article-body p {
  margin-bottom: 18px;
}

.article-body ul, .article-body ol {
  margin: 18px 0 24px 24px;
}

.article-body li {
  margin-bottom: 8px;
}

.article-body blockquote {
  border-left: 4px solid var(--primary-blue);
  background: rgba(59, 130, 246, 0.1);
  padding: 16px 20px;
  border-radius: var(--radius-sm);
  margin: 24px 0;
  color: #e2e8f0;
  font-style: italic;
}

.article-cta-box {
  margin-top: 50px;
  padding: 30px;
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.15), rgba(139, 92, 246, 0.15));
  border: 1px solid var(--border-color-glow);
  border-radius: var(--radius-lg);
  text-align: center;
}

/* Responsive Media Queries */
@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  
  .hero-title {
    font-size: 2.2rem;
  }
  
  .hero-cta {
    flex-direction: column;
  }
  
  .pricing-grid {
    grid-template-columns: 1fr;
  }
  
  .floating-card {
    animation: none;
  }
  
  .article-body {
    padding: 24px;
  }
}