@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800&family=Plus+Jakarta+Sans:wght@300;400;500;600;700;800&display=swap');

:root {
  --font-heading: 'Outfit', sans-serif;
  --font-body: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;

  /* Colors */
  --bg-darker: #060913;
  --bg-dark: #0a0e1a;
  --bg-card: rgba(15, 22, 42, 0.65);
  --bg-card-hover: rgba(22, 30, 57, 0.8);
  
  --color-primary: #8b5cf6;     /* Purple */
  --color-secondary: #00f2fe;   /* Cyan */
  --color-accent: #f43f5e;      /* Rose */
  --color-green: #10b981;       /* Emerald */
  
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  
  --border-color: rgba(255, 255, 255, 0.08);
  --border-color-hover: rgba(139, 92, 246, 0.4);
  
  --gradient-brand: linear-gradient(135deg, var(--color-primary) 0%, #3b82f6 50%, var(--color-secondary) 100%);
  --gradient-glow: radial-gradient(circle at 50% 50%, rgba(139, 92, 246, 0.15), transparent 60%);
  --gradient-card: linear-gradient(180deg, rgba(255, 255, 255, 0.03) 0%, rgba(255, 255, 255, 0) 100%);

  --shadow-sm: 0 2px 8px -2px rgba(0, 0, 0, 0.5);
  --shadow-md: 0 12px 24px -10px rgba(0, 0, 0, 0.6);
  --shadow-glow: 0 0 30px rgba(139, 92, 246, 0.25);
  --shadow-glow-cyan: 0 0 30px rgba(0, 242, 254, 0.25);

  --transition-fast: 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-normal: 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

body {
  background-color: var(--bg-darker);
  color: var(--text-primary);
  font-family: var(--font-body);
  line-height: 1.6;
  overflow-x: hidden;
}

/* Global Glow Backgrounds */
.glow-bg {
  position: absolute;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: var(--gradient-glow);
  filter: blur(80px);
  pointer-events: none;
  z-index: 0;
  opacity: 0.6;
}

.glow-1 { top: -10%; left: -10%; }
.glow-2 { top: 40%; right: -10%; }
.glow-3 { bottom: 10%; left: 10%; }

/* Navigation */
header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  background: rgba(6, 9, 19, 0.7);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1.25rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 800;
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.logo-icon {
  font-style: normal;
  font-size: 1.8rem;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 2.5rem;
  align-items: center;
}

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

.nav-menu a:hover {
  color: var(--text-primary);
  text-shadow: 0 0 10px rgba(255, 255, 255, 0.3);
}

.nav-btn {
  background: var(--gradient-brand);
  color: var(--bg-darker) !important;
  font-weight: 700 !important;
  padding: 0.6rem 1.5rem;
  border-radius: 50px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition-normal) !important;
}

.nav-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}

/* Sections */
section {
  position: relative;
  padding: 8rem 2rem 4rem;
  max-width: 1200px;
  margin: 0 auto;
  z-index: 1;
}

/* Typography */
h1, h2, h3, h4 {
  font-family: var(--font-heading);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.section-title {
  font-size: 2.5rem;
  text-align: center;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, #fff 0%, var(--text-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.section-subtitle {
  text-align: center;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 3.5rem;
  font-size: 1.1rem;
}

/* Hero Section */
.hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  min-height: 90vh;
  padding-top: 10rem;
}

.badge {
  background: rgba(139, 92, 246, 0.1);
  border: 1px solid rgba(139, 92, 246, 0.2);
  color: #a78bfa;
  padding: 0.4rem 1rem;
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  margin-bottom: 2rem;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  animation: pulse-border 3s infinite alternate;
}

@keyframes pulse-border {
  0% { border-color: rgba(139, 92, 246, 0.2); box-shadow: 0 0 5px rgba(139, 92, 246, 0.05); }
  100% { border-color: rgba(139, 92, 246, 0.5); box-shadow: 0 0 15px rgba(139, 92, 246, 0.2); }
}

.hero h1 {
  font-size: 4rem;
  line-height: 1.1;
  font-weight: 800;
  margin-bottom: 1.5rem;
  background: linear-gradient(to right, #ffffff 30%, #e2e8f0 60%, #8b5cf6 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero p {
  font-size: 1.25rem;
  color: var(--text-secondary);
  max-width: 700px;
  margin-bottom: 3rem;
}

.hero-buttons {
  display: flex;
  gap: 1.5rem;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  font-family: var(--font-heading);
  font-weight: 600;
  padding: 0.95rem 2.25rem;
  border-radius: 12px;
  font-size: 1.05rem;
  transition: var(--transition-normal);
  cursor: pointer;
}

.btn-primary {
  background: var(--gradient-brand);
  color: var(--bg-darker);
  box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 0 40px rgba(0, 242, 254, 0.4);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.03);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-3px);
}

/* Feature Cards Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-bottom: 4rem;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 2.5rem;
  transition: var(--transition-normal);
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--gradient-card);
  pointer-events: none;
  z-index: 1;
}

.card:hover {
  transform: translateY(-5px);
  border-color: var(--border-color-hover);
  box-shadow: var(--shadow-md), 0 0 20px rgba(139, 92, 246, 0.05);
}

.card-icon {
  width: 3.5rem;
  height: 3.5rem;
  border-radius: 12px;
  background: rgba(139, 92, 246, 0.1);
  border: 1px solid rgba(139, 92, 246, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  margin-bottom: 1.5rem;
  color: var(--color-primary);
}

.card h3 {
  font-size: 1.35rem;
  margin-bottom: 1rem;
}

.card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* Pricing Section */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
  align-items: flex-start;
}

.price-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 24px;
  padding: 2.5rem 1.8rem;
  position: relative;
  transition: var(--transition-normal);
  display: flex;
  flex-direction: column;
  height: 100%;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.price-card.featured {
  border-color: var(--color-primary);
  background: rgba(22, 20, 48, 0.8);
  box-shadow: var(--shadow-glow);
  transform: scale(1.03);
}

.price-card.featured::after {
  content: '⚡ 超值推荐';
  position: absolute;
  top: 1.25rem;
  right: 1.25rem;
  background: var(--gradient-brand);
  color: var(--bg-darker);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.3rem 0.8rem;
  border-radius: 50px;
  letter-spacing: 0.05em;
}

.price-card:hover {
  transform: translateY(-5px);
  border-color: var(--border-color-hover);
}

.price-card.featured:hover {
  transform: scale(1.03) translateY(-5px);
  box-shadow: 0 0 45px rgba(139, 92, 246, 0.35);
}

.price-header h3 {
  font-size: 1.35rem;
  margin-bottom: 0.5rem;
}

.price-desc {
  color: var(--text-secondary);
  font-size: 0.85rem;
  margin-bottom: 1.5rem;
}

.price-amount {
  display: flex;
  align-items: baseline;
  margin-bottom: 2rem;
}

.currency {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-primary);
}

.amount {
  font-family: var(--font-heading);
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--text-primary);
}

.period {
  color: var(--text-secondary);
  font-size: 0.85rem;
  margin-left: 0.25rem;
}

.price-features {
  list-style: none;
  margin-bottom: 2.5rem;
  flex-grow: 1;
}

.price-features li {
  color: var(--text-secondary);
  margin-bottom: 1rem;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.price-features li::before {
  content: '✓';
  color: var(--color-green);
  font-weight: bold;
}

.price-features li.disabled {
  color: var(--text-muted);
}

.price-features li.disabled::before {
  content: '✗';
  color: var(--color-accent);
}

.price-btn {
  width: 100%;
}

/* User Reviews Section */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 2rem;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.review-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.avatar-placeholder {
  width: 3rem;
  height: 3rem;
  border-radius: 50%;
  background: var(--gradient-brand);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: var(--bg-darker);
  font-size: 1.1rem;
}

.user-info h4 {
  font-size: 1rem;
  font-weight: 600;
}

.user-info p {
  color: var(--text-secondary);
  font-size: 0.8rem;
}

.rating {
  color: #fbbf24; /* Amber star */
  margin-bottom: 1rem;
  font-size: 0.95rem;
}

.review-content {
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-style: italic;
  line-height: 1.7;
}

/* FAQ Section (Accordion) */
.faq-container {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  margin-bottom: 1.25rem;
  overflow: hidden;
  transition: var(--transition-normal);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.faq-item:hover {
  border-color: rgba(255, 255, 255, 0.15);
}

.faq-question {
  width: 100%;
  text-align: left;
  padding: 1.5rem 2rem;
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.faq-icon {
  font-size: 1.25rem;
  color: var(--text-secondary);
  transition: transform 0.3s ease;
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s cubic-bezier(0, 1, 0, 1);
  padding: 0 2rem;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.8;
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
  color: var(--color-primary);
}

.faq-item.active .faq-answer {
  max-height: 1000px;
  padding-bottom: 1.5rem;
  transition: max-height 0.3s cubic-bezier(1, 0, 1, 0);
}

/* Blog Articles Section on Landing Page */
.blog-summary-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2rem;
  margin-bottom: 3rem;
}

.article-summary-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 2rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  height: 100%;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: var(--transition-normal);
}

.article-summary-card:hover {
  transform: translateY(-5px);
  border-color: var(--border-color-hover);
}

.article-tag {
  color: var(--color-secondary);
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  margin-bottom: 0.8rem;
}

.article-title-link {
  text-decoration: none;
  color: var(--text-primary);
}

.article-summary-card h3 {
  font-size: 1.25rem;
  line-height: 1.4;
  margin-bottom: 1rem;
  transition: var(--transition-fast);
}

.article-summary-card h3:hover {
  color: var(--color-secondary);
}

.article-excerpt {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

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

.read-more-btn {
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.9rem;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  transition: var(--transition-fast);
}

.read-more-btn::after {
  content: '→';
  transition: transform 0.2s ease;
}

.read-more-btn:hover {
  color: var(--color-secondary);
}

.read-more-btn:hover::after {
  transform: translateX(4px);
}

/* Blog Layout specific styles */
.blog-body {
  padding-top: 6rem;
}

.blog-hero {
  text-align: center;
  padding: 6rem 2rem 4rem;
}

.blog-hero h1 {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.blog-container {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 2rem 6rem;
}

.blog-content {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 24px;
  padding: 3.5rem;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.blog-post-header {
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 2rem;
  margin-bottom: 2.5rem;
}

.blog-post-title {
  font-size: 2.2rem;
  line-height: 1.25;
  margin-bottom: 1rem;
}

.blog-post-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.blog-post-meta span {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

/* Post Typography */
.post-body p {
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--text-secondary);
  margin-bottom: 1.75rem;
}

.post-body h2 {
  font-size: 1.65rem;
  margin: 2.5rem 0 1.25rem;
  color: var(--text-primary);
  border-left: 4px solid var(--color-primary);
  padding-left: 0.75rem;
}

.post-body h3 {
  font-size: 1.3rem;
  margin: 2rem 0 1rem;
  color: var(--text-primary);
}

.post-body blockquote {
  background: rgba(139, 92, 246, 0.05);
  border-left: 4px solid var(--color-primary);
  padding: 1.5rem 2rem;
  border-radius: 0 12px 12px 0;
  margin: 2rem 0;
}

.post-body blockquote p {
  margin-bottom: 0;
  font-style: italic;
  color: var(--text-primary);
}

.post-body ul, .post-body ol {
  margin: 0 0 1.75rem 1.5rem;
  color: var(--text-secondary);
  font-size: 1.05rem;
}

.post-body li {
  margin-bottom: 0.5rem;
}

.post-body a {
  color: var(--color-secondary);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
  transition: var(--transition-fast);
}

.post-body a:hover {
  color: var(--color-primary);
}

/* Post Bottom Navigation */
.post-navigation {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 4rem;
  border-top: 1px solid var(--border-color);
  padding-top: 2rem;
}

.post-nav-card {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1rem 1.5rem;
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 0.9rem;
  display: flex;
  flex-direction: column;
  max-width: 45%;
  transition: var(--transition-normal);
}

.post-nav-card:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: var(--border-color-hover);
  color: var(--text-primary);
}

.post-nav-card span {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  margin-bottom: 0.25rem;
}

/* Footer */
footer {
  background: var(--bg-darker);
  border-top: 1px solid var(--border-color);
  padding: 5rem 2rem 2rem;
  position: relative;
  z-index: 1;
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 2fr;
  gap: 4rem;
  margin-bottom: 4rem;
}

.footer-brand p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-top: 1rem;
  max-width: 280px;
}

.footer-links h4 {
  font-size: 1rem;
  margin-bottom: 1.5rem;
  color: var(--text-primary);
}

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

.footer-links li {
  margin-bottom: 0.75rem;
}

.footer-links a {
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 0.9rem;
  transition: var(--transition-fast);
}

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

.footer-bottom {
  max-width: 1200px;
  margin: 0 auto;
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* Mobile Menu Button */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 6px;
  background: none;
  border: none;
  cursor: pointer;
  z-index: 110;
}

.menu-toggle span {
  width: 25px;
  height: 2px;
  background-color: var(--text-primary);
  transition: 0.3s ease;
}

/* Responsive adjustments */
@media (max-width: 1024px) {
  .footer-container {
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
  }
}

@media (max-width: 768px) {
  .hero h1 {
    font-size: 2.8rem;
  }
  
  .hero p {
    font-size: 1.1rem;
  }
  
  .nav-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background: rgba(6, 9, 19, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    flex-direction: column;
    justify-content: center;
    gap: 2rem;
    transition: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    border-left: 1px solid var(--border-color);
  }
  
  .nav-menu.active {
    right: 0;
  }
  
  .menu-toggle {
    display: flex;
  }
  
  .menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 6px);
  }
  
  .menu-toggle.active span:nth-child(2) {
    opacity: 0;
  }
  
  .menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -6px);
  }

  .price-card.featured {
    transform: none;
  }
  
  .price-card.featured:hover {
    transform: translateY(-5px);
  }
  
  .footer-container {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .blog-content {
    padding: 2rem 1.5rem;
  }

  .blog-post-title {
    font-size: 1.85rem;
  }
}