/* ==========================================================================
   库洛米 (Kuromi) - 全球化网络加速服务 Design System & Styles
   Theme: Cosmic Dark Purple & Pink Neon Gradient with High Precision Detail
   ========================================================================== */

:root {
  --bg-dark: #070719;
  --bg-card: rgba(255, 255, 255, 0.04);
  --bg-card-hover: rgba(255, 255, 255, 0.08);
  --border-card: rgba(255, 255, 255, 0.1);
  --border-glow: rgba(224, 64, 251, 0.4);
  
  --primary-pink: #e040fb;
  --primary-purple: #7c4dff;
  --accent-gold: #ffab00;
  --accent-orange: #ff6d00;
  
  --text-main: #ffffff;
  --text-muted: #a0a5c0;
  --text-dim: #6c7293;
  
  --btn-gradient: linear-gradient(135deg, #e040fb 0%, #9c27b0 50%, #7c4dff 100%);
  --btn-gradient-hover: linear-gradient(135deg, #ea80fc 0%, #ab47bc 50%, #b388ff 100%);
  --btn-alt-gradient: linear-gradient(135deg, #00e5ff 0%, #2979ff 100%);
  --gold-gradient: linear-gradient(135deg, #ffe082 0%, #ffab00 50%, #ff6d00 100%);
  
  --shadow-glow: 0 10px 30px rgba(224, 64, 251, 0.35);
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-logo: "Georgia", "Times New Roman", serif;
}

* {
  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);
  overflow-x: hidden;
  font-size: 16px;
  line-height: 1.6;
}

body {
  background: radial-gradient(circle at 10% 20%, #1e0836 0%, #070719 50%),
              radial-gradient(circle at 90% 80%, #130a38 0%, #070719 60%);
  background-attachment: fixed;
  min-height: 100vh;
  position: relative;
}

/* Background Stars Animation */
.stars-bg {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
  background-image: 
    radial-gradient(1.5px 1.5px at 20px 30px, #ffffff, rgba(0,0,0,0)),
    radial-gradient(2px 2px at 40px 70px, #e040fb, rgba(0,0,0,0)),
    radial-gradient(1px 1px at 90px 40px, #ffffff, rgba(0,0,0,0)),
    radial-gradient(2px 2px at 160px 120px, #7c4dff, rgba(0,0,0,0)),
    radial-gradient(1.5px 1.5px at 230px 190px, #ffab00, rgba(0,0,0,0)),
    radial-gradient(2px 2px at 300px 60px, #ffffff, rgba(0,0,0,0));
  background-repeat: repeat;
  background-size: 350px 350px;
  opacity: 0.6;
}

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

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  background: rgba(7, 7, 25, 0.75);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  transition: all 0.3s ease;
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 76px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
  user-select: none;
  transition: transform 0.3s ease;
}

.brand-logo:hover {
  transform: scale(1.03);
}

.logo-script {
  font-family: var(--font-logo);
  font-style: italic;
  font-size: 26px;
  color: #f0abfc;
  letter-spacing: 1px;
  text-shadow: 0 0 12px rgba(224, 64, 251, 0.6);
}

.logo-cn {
  font-size: 22px;
  font-weight: 800;
  background: linear-gradient(135deg, #ffffff 0%, #e2e8f0 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: 1px;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-link {
  font-size: 15px;
  font-weight: 500;
  color: var(--text-muted);
  transition: all 0.3s ease;
  position: relative;
}

.nav-link:hover {
  color: #ffffff;
  text-shadow: 0 0 8px rgba(255, 255, 255, 0.5);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary-pink);
  transition: width 0.3s ease;
  border-radius: 2px;
}

.nav-link:hover::after {
  width: 100%;
}

.header-btn {
  padding: 10px 24px;
  border-radius: 30px;
  background: var(--btn-gradient);
  color: #ffffff;
  font-weight: 600;
  font-size: 14px;
  box-shadow: var(--shadow-glow);
  transition: all 0.3s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.header-btn:hover {
  background: var(--btn-gradient-hover);
  transform: translateY(-2px);
  box-shadow: 0 12px 35px rgba(224, 64, 251, 0.5);
}

/* Mobile Nav Toggle */
.mobile-nav-toggle {
  display: none;
  background: none;
  border: none;
  color: #fff;
  font-size: 24px;
  cursor: pointer;
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero-section {
  padding-top: 150px;
  padding-bottom: 100px;
  position: relative;
  overflow: hidden;
  min-height: 90vh;
  display: flex;
  align-items: center;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 40px;
  align-items: center;
}

.hero-content {
  z-index: 2;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: 20px;
  background: rgba(224, 64, 251, 0.12);
  border: 1px solid rgba(224, 64, 251, 0.3);
  color: #f0abfc;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 24px;
}

.hero-title {
  font-size: 54px;
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: 20px;
  letter-spacing: -1px;
}

.hero-title .brand-name {
  display: block;
  font-size: 32px;
  color: #f0abfc;
  font-family: var(--font-logo);
  font-style: italic;
  font-weight: normal;
  margin-bottom: 8px;
}

.hero-title .highlight-orange {
  color: var(--accent-gold);
  text-shadow: 0 0 20px rgba(255, 171, 0, 0.4);
}

.hero-subtitle {
  font-size: 20px;
  color: var(--text-muted);
  margin-bottom: 36px;
  font-weight: 400;
}

.hero-subtitle .speed-highlight {
  color: var(--accent-gold);
  font-weight: 700;
  font-size: 24px;
}

.hero-actions {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

.cta-btn-primary {
  padding: 16px 38px;
  border-radius: 40px;
  background: var(--btn-gradient);
  color: #ffffff;
  font-size: 17px;
  font-weight: 700;
  box-shadow: 0 10px 30px rgba(224, 64, 251, 0.4);
  transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.cta-btn-primary:hover {
  transform: translateY(-4px) scale(1.02);
  box-shadow: 0 15px 40px rgba(224, 64, 251, 0.6);
  background: var(--btn-gradient-hover);
}

.cta-btn-secondary {
  padding: 16px 32px;
  border-radius: 40px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: #ffffff;
  font-size: 16px;
  font-weight: 600;
  backdrop-filter: blur(10px);
  transition: all 0.3s ease;
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.cta-btn-secondary:hover {
  background: rgba(255, 255, 255, 0.16);
  border-color: rgba(224, 64, 251, 0.5);
  transform: translateY(-3px);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
}

/* Rocket Visual Illustration matching image */
.hero-visual {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

.rocket-wrapper {
  position: relative;
  width: 100%;
  max-width: 480px;
  animation: floatRocket 4s ease-in-out infinite;
}

@keyframes floatRocket {
  0%, 100% { transform: translateY(0px) rotate(0deg); }
  50% { transform: translateY(-18px) rotate(2deg); }
}

.rocket-svg {
  width: 100%;
  height: auto;
  filter: drop-shadow(0 20px 40px rgba(124, 77, 255, 0.4));
}

.cosmic-wave-bg {
  position: absolute;
  bottom: -60px;
  left: -20%;
  width: 140%;
  height: 250px;
  background: linear-gradient(180deg, rgba(224, 64, 251, 0.15) 0%, rgba(255, 171, 0, 0.1) 50%, transparent 100%);
  border-radius: 50% 50% 0 0 / 100% 100% 0 0;
  filter: blur(30px);
  pointer-events: none;
}

/* ==========================================================================
   Features Section (Product Core Advantages)
   ========================================================================== */
.section-padding {
  padding: 100px 0;
}

.section-header {
  text-align: center;
  max-width: 750px;
  margin: 0 auto 60px;
}

.section-tag {
  color: #f0abfc;
  font-size: 14px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 12px;
  display: block;
}

.section-title {
  font-size: 38px;
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 16px;
  line-height: 1.2;
}

.section-desc {
  font-size: 17px;
  color: var(--text-muted);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: 20px;
  padding: 36px 28px;
  backdrop-filter: blur(16px);
  transition: all 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--primary-pink), transparent);
  opacity: 0;
  transition: opacity 0.4s ease;
}

.feature-card:hover {
  transform: translateY(-8px);
  background: var(--bg-card-hover);
  border-color: var(--border-glow);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

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

.feature-icon-box {
  width: 68px;
  height: 68px;
  border-radius: 18px;
  background: linear-gradient(135deg, rgba(224, 64, 251, 0.15) 0%, rgba(124, 77, 255, 0.15) 100%);
  border: 1px solid rgba(224, 64, 251, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  color: #f0abfc;
  font-size: 30px;
}

.feature-card-title {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 12px;
  color: #ffffff;
}

.feature-card-desc {
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.7;
}

/* ==========================================================================
   Streaming & AI Support Section
   ========================================================================== */
.streaming-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.stream-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: 18px;
  padding: 24px;
  text-align: center;
  transition: all 0.3s ease;
  backdrop-filter: blur(12px);
}

.stream-card:hover {
  transform: translateY(-5px);
  border-color: rgba(224, 64, 251, 0.4);
  background: rgba(255, 255, 255, 0.07);
  box-shadow: 0 15px 30px rgba(0, 0, 0, 0.3);
}

.stream-badge {
  display: inline-block;
  font-size: 32px;
  margin-bottom: 12px;
}

.stream-name {
  font-size: 18px;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 6px;
}

.stream-tag {
  font-size: 13px;
  color: var(--accent-gold);
  font-weight: 500;
}

/* ==========================================================================
   Pricing Section
   ========================================================================== */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: 24px;
  padding: 36px 24px;
  backdrop-filter: blur(16px);
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all 0.3s ease;
}

.pricing-card.popular {
  background: linear-gradient(180deg, rgba(224, 64, 251, 0.12) 0%, rgba(124, 77, 255, 0.08) 100%);
  border: 2px solid var(--primary-pink);
  transform: scale(1.03);
  box-shadow: 0 15px 40px rgba(224, 64, 251, 0.25);
}

.popular-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--btn-gradient);
  color: #fff;
  padding: 4px 16px;
  border-radius: 12px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1px;
}

.pricing-title {
  font-size: 20px;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 12px;
}

.pricing-price {
  font-size: 36px;
  font-weight: 900;
  color: #ffffff;
  margin-bottom: 20px;
}

.pricing-price span {
  font-size: 14px;
  color: var(--text-muted);
  font-weight: 400;
}

.pricing-features {
  list-style: none;
  margin-bottom: 30px;
  flex-grow: 1;
}

.pricing-features li {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.pricing-features li::before {
  content: "✓";
  color: var(--primary-pink);
  font-weight: bold;
}

.pricing-btn {
  width: 100%;
  padding: 14px 20px;
  border-radius: 30px;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: #ffffff;
  font-weight: 700;
  text-align: center;
  transition: all 0.3s ease;
  display: block;
}

.pricing-card.popular .pricing-btn,
.pricing-btn.primary-btn {
  background: var(--btn-gradient);
  border: none;
  box-shadow: var(--shadow-glow);
}

.pricing-btn:hover {
  background: var(--btn-gradient-hover);
  transform: translateY(-2px);
  color: #fff;
}

/* ==========================================================================
   12 SEO Articles Grid (Positioned directly under Pricing)
   ========================================================================== */
.articles-section {
  padding-top: 60px;
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: 18px;
  padding: 24px;
  backdrop-filter: blur(12px);
  transition: all 0.3s ease;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.article-card:hover {
  border-color: var(--border-glow);
  transform: translateY(-4px);
  background: rgba(255, 255, 255, 0.07);
}

.article-category {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  color: var(--accent-gold);
  text-transform: uppercase;
  margin-bottom: 8px;
}

.article-card-title {
  font-size: 18px;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 12px;
  line-height: 1.4;
}

.article-excerpt {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 16px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  line-height: 1.6;
}

.article-link {
  font-size: 14px;
  font-weight: 600;
  color: #f0abfc;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: gap 0.2s ease;
}

.article-link:hover {
  gap: 10px;
  color: #ffffff;
}

/* ==========================================================================
   Reviews / Testimonials
   ========================================================================== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: 20px;
  padding: 28px;
  backdrop-filter: blur(12px);
}

.stars {
  color: var(--accent-gold);
  font-size: 16px;
  margin-bottom: 12px;
}

.review-text {
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 20px;
  font-style: italic;
}

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

.reviewer-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--btn-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  color: #fff;
  font-size: 16px;
}

.reviewer-info h4 {
  font-size: 15px;
  color: #fff;
}

.reviewer-info p {
  font-size: 12px;
  color: var(--text-dim);
}

/* ==========================================================================
   FAQ Section
   ========================================================================== */
.faq-accordion {
  max-width: 850px;
  margin: 0 auto;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: 16px;
  margin-bottom: 16px;
  overflow: hidden;
  transition: border-color 0.3s ease;
}

.faq-question {
  padding: 22px 28px;
  font-size: 18px;
  font-weight: 700;
  color: #ffffff;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  user-select: none;
}

.faq-question::after {
  content: "+";
  font-size: 24px;
  color: #f0abfc;
  transition: transform 0.3s ease;
}

.faq-item.active .faq-question::after {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.4s ease;
  padding: 0 28px;
  color: var(--text-muted);
  font-size: 15px;
  line-height: 1.7;
}

.faq-item.active .faq-answer {
  max-height: 300px;
  padding-bottom: 22px;
}

/* ==========================================================================
   Side Floating Navigation Controls (Interactive Section Arrows)
   ========================================================================== */
.floating-side-nav {
  position: fixed;
  right: 24px;
  top: 50%;
  transform: translateY(-50%);
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.nav-arrow-btn {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: rgba(15, 12, 41, 0.85);
  border: 1px solid rgba(224, 64, 251, 0.4);
  color: #ffffff;
  font-size: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(10px);
  transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.nav-arrow-btn:hover {
  background: var(--btn-gradient);
  transform: scale(1.15);
  box-shadow: 0 0 25px rgba(224, 64, 251, 0.7);
  border-color: #ffffff;
}

.nav-arrow-btn:active {
  transform: scale(0.95);
}

/* ==========================================================================
   Footer & PBN Backlink Section
   ========================================================================== */
.site-footer {
  background: #04040e;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: 60px 0 30px;
  position: relative;
  z-index: 10;
}

.footer-nav-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
  margin-bottom: 50px;
  text-align: center;
}

.footer-nav-item h3 {
  font-size: 18px;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 16px;
}

.footer-nav-item a {
  color: var(--text-muted);
  font-size: 15px;
  transition: color 0.3s ease;
  display: inline-block;
  padding: 4px 0;
}

.footer-nav-item a:hover {
  color: #f0abfc;
  text-shadow: 0 0 8px rgba(240, 171, 252, 0.5);
}

/* PBN SEO Links Area */
.pbn-footer-box {
  border-top: 1px dashed rgba(255, 255, 255, 0.12);
  padding-top: 30px;
  text-align: center;
}

.pbn-links-row {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.pbn-link {
  color: #f0abfc;
  font-size: 14px;
  font-weight: 600;
  text-decoration: underline;
  transition: all 0.3s ease;
}

.pbn-link:hover {
  color: #ffffff;
  text-shadow: 0 0 10px rgba(224, 64, 251, 0.8);
}

.copyright-text {
  font-size: 13px;
  color: var(--text-dim);
}

/* ==========================================================================
   Responsive Media Queries (@media)
   ========================================================================== */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .hero-actions {
    justify-content: center;
  }
  .features-grid, .streaming-grid, .pricing-grid, .articles-grid, .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-card.popular {
    transform: scale(1);
  }
}

@media (max-width: 768px) {
  .hero-title {
    font-size: 38px;
  }
  .hero-subtitle {
    font-size: 16px;
  }
  .features-grid, .streaming-grid, .pricing-grid, .articles-grid, .reviews-grid, .footer-nav-grid {
    grid-template-columns: 1fr;
  }
  .main-nav {
    display: none; /* Hide standard nav on mobile */
  }
  .mobile-nav-toggle {
    display: block;
  }
  .floating-side-nav {
    right: 12px;
  }
  .nav-arrow-btn {
    width: 40px;
    height: 40px;
    font-size: 16px;
  }
  .pbn-links-row {
    flex-direction: column;
    gap: 12px;
  }
}