/* ==========================================
   神行加速 - 官方推广落地页核心样式表
   Design: Modern Dark Tech / Glassmorphism / Cyberpunk Blue-Purple Glow
   Responsive: Mobile First & Desktop Optimized
   ========================================== */

:root {
  --bg-dark: #07090e;
  --bg-card: rgba(18, 24, 38, 0.7);
  --bg-card-hover: rgba(26, 35, 56, 0.85);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-glow: rgba(0, 210, 255, 0.3);
  
  --primary: #00d2ff;
  --primary-gradient: linear-gradient(135deg, #00d2ff 0%, #3a7bd5 50%, #7f00ff 100%);
  --accent-gold: #ffb703;
  --accent-purple: #9d4edd;
  
  --text-main: #f1f5f9;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  
  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.2);
  --shadow-glow: 0 0 25px rgba(0, 210, 255, 0.25);
  --shadow-purple-glow: 0 0 25px rgba(157, 78, 221, 0.25);
  
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background-color: var(--bg-dark);
  color: var(--text-main);
  line-height: 1.6;
  overflow-x: hidden;
}

body {
  position: relative;
  background: radial-gradient(circle at 10% 20%, rgba(0, 210, 255, 0.05) 0%, transparent 40%),
              radial-gradient(circle at 90% 80%, rgba(127, 0, 255, 0.07) 0%, transparent 40%),
              var(--bg-dark);
  min-height: 100vh;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

ul {
  list-style: none;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* Container */
.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header & Nav */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(7, 9, 14, 0.85);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  transition: all var(--transition-smooth);
}

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

.logo-wrapper {
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
  transition: transform var(--transition-fast);
}

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

.logo-img {
  height: 42px;
  width: auto;
  object-fit: contain;
  filter: drop-shadow(0 0 8px rgba(0, 210, 255, 0.4));
}

.brand-title {
  font-size: 1.4rem;
  font-weight: 800;
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: -0.5px;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-muted);
  position: relative;
  padding: 6px 0;
}

.nav-link:hover, .nav-link.active {
  color: var(--primary);
}

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

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

.header-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 20px;
  background: var(--primary-gradient);
  color: #fff;
  font-weight: 600;
  font-size: 0.9rem;
  border-radius: var(--radius-full);
  box-shadow: 0 4px 15px rgba(0, 210, 255, 0.3);
  transition: all var(--transition-fast);
}

.header-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 210, 255, 0.5);
}

/* Hero Section */
.hero-section {
  padding: 150px 0 90px 0;
  position: relative;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 50px;
  align-items: center;
}

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

.badge-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: rgba(0, 210, 255, 0.1);
  border: 1px solid rgba(0, 210, 255, 0.3);
  border-radius: var(--radius-full);
  color: var(--primary);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 24px;
}

.badge-dot {
  width: 8px;
  height: 8px;
  background-color: var(--primary);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--primary);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(0, 210, 255, 0.7); }
  70% { transform: scale(1); box-shadow: 0 0 0 10px rgba(0, 210, 255, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(0, 210, 255, 0); }
}

.hero-title {
  font-size: 3.2rem;
  font-weight: 900;
  line-height: 1.25;
  margin-bottom: 20px;
  color: var(--text-main);
  letter-spacing: -1px;
}

.hero-title .gradient-text {
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

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

.hero-actions {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 30px;
}

/* CTA Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 32px;
  border-radius: var(--radius-full);
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-align: center;
  white-space: nowrap;
}

.btn-primary {
  background: var(--primary-gradient);
  color: #ffffff;
  box-shadow: var(--shadow-glow);
  border: none;
}

.btn-primary:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 0 35px rgba(0, 210, 255, 0.5);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-main);
  border: 1px solid rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-3px);
}

.hero-features-strip {
  display: flex;
  gap: 24px;
  padding-top: 20px;
  border-top: 1px solid var(--border-color);
}

.strip-item {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-dim);
  font-size: 0.9rem;
}

.strip-icon {
  color: var(--primary);
}

/* Right Side Dynamic Card Visual */
.hero-visual {
  position: relative;
  display: flex;
  justify-content: center;
}

.visual-card-stack {
  position: relative;
  width: 100%;
  max-width: 440px;
  height: 400px;
}

.glass-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(20px);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-smooth);
}

.main-stat-card {
  position: absolute;
  top: 20px;
  left: 0;
  width: 100%;
  z-index: 2;
  border-color: rgba(0, 210, 255, 0.3);
  box-shadow: var(--shadow-glow);
}

.speed-meter-wrapper {
  text-align: center;
  padding: 10px 0;
}

.speed-value {
  font-size: 3.5rem;
  font-weight: 900;
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1;
}

.speed-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-top: 6px;
}

.floating-subcard-1 {
  position: absolute;
  bottom: 10px;
  left: -20px;
  width: 220px;
  z-index: 3;
  animation: float 4s ease-in-out infinite;
}

.floating-subcard-2 {
  position: absolute;
  top: -15px;
  right: -15px;
  width: 200px;
  z-index: 3;
  animation: float 5s ease-in-out infinite reverse;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.stat-item-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

/* Section Common */
.section {
  padding: 100px 0;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 60px auto;
}

.section-tag {
  color: var(--primary);
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  margin-bottom: 10px;
  display: block;
}

.section-title {
  font-size: 2.3rem;
  font-weight: 800;
  margin-bottom: 16px;
  color: var(--text-main);
  letter-spacing: -0.5px;
}

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

/* Core Advantages Cards (3 Cards) */
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.advantage-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  transition: all var(--transition-smooth);
  position: relative;
  overflow: hidden;
}

.advantage-card:hover {
  transform: translateY(-8px);
  border-color: var(--border-glow);
  box-shadow: var(--shadow-glow);
  background: var(--bg-card-hover);
}

.advantage-icon-box {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-md);
  background: rgba(0, 210, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  color: var(--primary);
  margin-bottom: 24px;
  border: 1px solid rgba(0, 210, 255, 0.2);
}

.advantage-card h3 {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 14px;
  color: var(--text-main);
}

.advantage-card p {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.65;
}

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

.media-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  text-align: center;
  transition: all var(--transition-smooth);
}

.media-card:hover {
  transform: translateY(-6px);
  border-color: rgba(157, 78, 221, 0.4);
  box-shadow: var(--shadow-purple-glow);
}

.media-icon {
  width: 54px;
  height: 54px;
  margin: 0 auto 16px auto;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  background: rgba(255, 255, 255, 0.05);
}

.media-card h4 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.media-card p {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Pricing Table 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-color);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all var(--transition-smooth);
  position: relative;
}

.pricing-card.popular {
  border-color: var(--primary);
  box-shadow: var(--shadow-glow);
  background: rgba(0, 210, 255, 0.04);
  transform: scale(1.03);
}

.pricing-badge {
  position: absolute;
  top: -12px;
  right: 20px;
  background: var(--primary-gradient);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  text-transform: uppercase;
}

.pricing-header h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.price-box {
  margin: 16px 0 24px 0;
}

.price-currency {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--primary);
}

.price-amount {
  font-size: 2.6rem;
  font-weight: 900;
  color: var(--text-main);
  line-height: 1;
}

.price-period {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.pricing-features {
  margin-bottom: 30px;
}

.pricing-features li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.pricing-features li.check {
  color: var(--text-main);
}

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

/* SEO Articles Grid Section */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  transition: all var(--transition-smooth);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.article-card:hover {
  transform: translateY(-6px);
  border-color: rgba(0, 210, 255, 0.4);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
}

.article-tag {
  display: inline-block;
  padding: 4px 10px;
  background: rgba(0, 210, 255, 0.1);
  color: var(--primary);
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 600;
  margin-bottom: 14px;
}

.article-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 12px;
  color: var(--text-main);
}

.article-card p {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 20px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 14px;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  font-size: 0.8rem;
  color: var(--text-dim);
}

.article-btn-group {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-top: 16px;
}

.article-read-btn {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--primary);
}

.article-aff-btn {
  font-size: 0.8rem;
  padding: 6px 14px;
  background: var(--primary-gradient);
  color: #fff;
  border-radius: var(--radius-full);
  font-weight: 600;
}

/* FAQ Accordion Section */
.faq-list {
  max-width: 860px;
  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: all var(--transition-fast);
}

.faq-question {
  padding: 20px 24px;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  user-select: none;
}

.faq-question:hover {
  color: var(--primary);
}

.faq-answer {
  padding: 0 24px 20px 24px;
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.7;
}

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

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 28px;
}

.stars {
  color: var(--accent-gold);
  margin-bottom: 12px;
  font-size: 0.9rem;
}

.review-text {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 20px;
}

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

.reviewer-avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--primary-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: #fff;
  font-size: 0.95rem;
}

.reviewer-info h5 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-main);
}

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

/* Section Navigation Arrows (Right Fixed Floating) */
.section-nav-arrow-container {
  position: fixed;
  right: 24px;
  top: 50%;
  transform: translateY(-50%);
  z-index: 999;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.section-arrow-btn {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: rgba(18, 24, 38, 0.85);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(10px);
  transition: all var(--transition-fast);
}

.section-arrow-btn:hover {
  background: var(--primary);
  color: #000;
  border-color: var(--primary);
  transform: scale(1.15);
  box-shadow: var(--shadow-glow);
}

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

/* Footer */
.footer {
  background: #040508;
  border-top: 1px solid var(--border-color);
  padding: 60px 0 30px 0;
  margin-top: 60px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand p {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-top: 12px;
  max-width: 400px;
}

.footer-links-four {
  display: flex;
  gap: 32px;
}

.footer-link-item {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-muted);
  transition: color var(--transition-fast);
}

.footer-link-item:hover {
  color: var(--primary);
}

/* Footer Centered PBN Friendly Links */
.footer-pbn-section {
  text-align: center;
  padding-top: 30px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  margin-top: 30px;
}

.pbn-statement {
  font-size: 0.85rem;
  color: var(--text-dim);
  margin-bottom: 12px;
}

.pbn-links-row {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}

.pbn-link {
  font-size: 0.9rem;
  color: var(--primary);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 4px;
  transition: opacity var(--transition-fast);
}

.pbn-link:hover {
  opacity: 0.8;
  color: #fff;
}

.copyright {
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-top: 20px;
}

/* Article Detail Page Layout Styling */
.article-detail-container {
  padding: 130px 0 80px 0;
  max-width: 900px;
  margin: 0 auto;
}

.article-header-box {
  margin-bottom: 40px;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 30px;
}

.article-header-box h1 {
  font-size: 2.4rem;
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 16px;
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.article-body {
  font-size: 1.05rem;
  line-height: 1.85;
  color: var(--text-main);
}

.article-body h2 {
  font-size: 1.6rem;
  font-weight: 700;
  margin: 40px 0 16px 0;
  color: var(--primary);
  border-left: 4px solid var(--primary);
  padding-left: 12px;
}

.article-body h3 {
  font-size: 1.3rem;
  font-weight: 600;
  margin: 28px 0 12px 0;
  color: var(--text-main);
}

.article-body p {
  margin-bottom: 20px;
  color: var(--text-muted);
}

.article-cta-box {
  background: var(--bg-card);
  border: 1px solid var(--primary);
  border-radius: var(--radius-lg);
  padding: 36px;
  text-align: center;
  margin: 50px 0;
  box-shadow: var(--shadow-glow);
}

.article-cta-box h3 {
  font-size: 1.6rem;
  font-weight: 800;
  margin-bottom: 12px;
}

.article-cta-box p {
  color: var(--text-muted);
  margin-bottom: 24px;
}

/* Responsive Media Queries (@media) */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  
  .hero-title {
    font-size: 2.6rem;
  }
  
  .advantages-grid, .articles-grid, .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .media-ai-grid, .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .pricing-card.popular {
    transform: none;
  }
}

@media (max-width: 768px) {
  .header-container {
    height: 64px;
  }
  
  .nav-menu {
    display: none; /* Mobile menu minimized for speed & focus */
  }
  
  .hero-section {
    padding: 110px 0 60px 0;
  }
  
  .hero-title {
    font-size: 2rem;
  }
  
  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }
  
  .btn {
    width: 100%;
  }
  
  .advantages-grid,
  .media-ai-grid,
  .pricing-grid,
  .articles-grid,
  .reviews-grid {
    grid-template-columns: 1fr;
  }
  
  .section-nav-arrow-container {
    right: 10px;
  }
  
  .section-arrow-btn {
    width: 40px;
    height: 40px;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-links-four {
    flex-wrap: wrap;
    gap: 16px;
  }
}