/* FatCatCloud Landing Page Styles */

:root {
  --primary-color: #3b82f6;
  --primary-hover: #2563eb;
  --secondary-color: #1d4ed8;
  --accent-color: #06b6d4;
  --bg-dark-top: #0a0f24;
  --bg-dark-bottom: #0e1738;
  --bg-light: #f8fafc;
  --card-bg-dark: rgba(255, 255, 255, 0.05);
  --card-border-dark: rgba(255, 255, 255, 0.12);
  --card-bg-light: #ffffff;
  --text-main-dark: #ffffff;
  --text-sub-dark: #94a3b8;
  --text-main-light: #0f172a;
  --text-sub-light: #475569;
  --border-radius: 12px;
  --container-width: 1200px;
  --transition-fast: all 0.3s ease;
}

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

html {
  scroll-behavior: smooth;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--text-main-light);
  background-color: var(--bg-light);
}

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

ul {
  list-style: none;
}

.container {
  width: 90%;
  max-width: var(--container-width);
  margin: 0 auto;
}

/* Header Navbar */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(10, 15, 36, 0.9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  padding: 15px 0;
  transition: var(--transition-fast);
}

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

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
}

.brand img {
  width: 38px;
  height: 38px;
  border-radius: 8px;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav-link {
  color: #cbd5e1;
  font-size: 0.95rem;
  font-weight: 500;
  transition: var(--transition-fast);
}

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

.nav-btn {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: #fff !important;
  padding: 8px 20px;
  border-radius: 8px;
  font-weight: 600;
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
  transition: var(--transition-fast);
}

.nav-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(59, 130, 246, 0.4);
}

.mobile-toggle {
  display: none;
  font-size: 1.5rem;
  color: #fff;
  cursor: pointer;
}

/* Hero Section */
.hero-section {
  background: linear-gradient(180deg, var(--bg-dark-top) 0%, var(--bg-dark-bottom) 100%);
  color: #fff;
  padding: 140px 0 90px 0;
  position: relative;
  overflow: hidden;
}

.hero-section::before {
  content: "";
  position: absolute;
  top: 10%;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 400px;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.15) 0%, rgba(0, 0, 0, 0) 70%);
  pointer-events: none;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}

.hero-content h1 {
  font-size: 2.8rem;
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 20px;
  background: linear-gradient(135deg, #ffffff 0%, #cbd5e1 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-content p {
  font-size: 1.1rem;
  line-height: 1.7;
  color: var(--text-sub-dark);
  margin-bottom: 32px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.btn-primary {
  background: #2563eb;
  color: #fff;
  padding: 12px 28px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 1rem;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.4);
  transition: var(--transition-fast);
}

.btn-primary:hover {
  background: #1d4ed8;
  transform: translateY(-2px);
}

.btn-secondary {
  border: 1px solid rgba(255, 255, 255, 0.3);
  color: #fff;
  padding: 12px 28px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 1rem;
  transition: var(--transition-fast);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: #fff;
}

.btn-recommend {
  background: linear-gradient(135deg, #06b6d4 0%, #0284c7 100%);
  color: #fff;
  padding: 12px 28px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 1rem;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  box-shadow: 0 4px 14px rgba(6, 182, 212, 0.35);
  transition: var(--transition-fast);
}

.btn-recommend:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(6, 182, 212, 0.5);
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}

.stat-card {
  background: var(--card-bg-dark);
  border: 1px solid var(--card-border-dark);
  border-radius: var(--border-radius);
  padding: 16px 12px;
  text-align: center;
  backdrop-filter: blur(5px);
}

.stat-card .label {
  font-size: 0.85rem;
  color: var(--text-sub-dark);
  margin-bottom: 6px;
}

.stat-card .value {
  font-size: 1.4rem;
  font-weight: 700;
  color: #60a5fa;
}

/* Hero Graphic Illustration */
.hero-graphic {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

.server-rack-box {
  width: 100%;
  max-width: 440px;
  background: rgba(15, 23, 42, 0.8);
  border: 2px solid rgba(59, 130, 246, 0.3);
  border-radius: 20px;
  padding: 30px;
  box-shadow: 0 0 30px rgba(59, 130, 246, 0.2);
  position: relative;
}

.server-lights {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.server-unit {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 8px;
  padding: 14px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.light-dots {
  display: flex;
  gap: 8px;
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #34d399;
  box-shadow: 0 0 8px #34d399;
}

.dot.blue {
  background: #60a5fa;
  box-shadow: 0 0 8px #60a5fa;
}

.dot.cyan {
  background: #22d3ee;
  box-shadow: 0 0 8px #22d3ee;
}

.unit-bars {
  display: flex;
  gap: 6px;
}

.bar {
  width: 24px;
  height: 6px;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 3px;
}

.bar.active {
  background: #3b82f6;
}

/* Sections Common */
.section {
  padding: 80px 0;
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 50px auto;
}

.section-title {
  font-size: 2.2rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-main-light);
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-sub-light);
  line-height: 1.6;
}

/* Advantages Grid */
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.advantage-card {
  background: var(--card-bg-light);
  border: 1px solid #e2e8f0;
  border-radius: var(--border-radius);
  padding: 30px 24px;
  transition: var(--transition-fast);
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
}

.advantage-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 12px 20px -5px rgba(0, 0, 0, 0.1);
  border-color: var(--primary-color);
}

.adv-icon {
  width: 52px;
  height: 52px;
  border-radius: 12px;
  background: #eff6ff;
  color: var(--primary-color);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 20px;
}

.advantage-card h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 10px;

}

.advantage-card p {
  color: var(--text-sub-light);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* Pricing Section */
.pricing-section {
  background: #f1f5f9;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.price-card {
  background: #fff;
  border-radius: var(--border-radius);
  border: 1px solid #cbd5e1;
  padding: 32px 24px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: var(--transition-fast);
}

.price-card.popular {
  border: 2px solid var(--primary-color);
  box-shadow: 0 10px 25px rgba(59, 130, 246, 0.15);
  transform: scale(1.03);
}

.popular-badge {
  position: absolute;
  top: -14px;
  right: 20px;
  background: linear-gradient(135deg, #3b82f6, #1d4ed8);
  color: #fff;
  font-size: 0.8rem;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 20px;
}

.price-card h3 {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.price-amount {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--text-main-light);
  margin-bottom: 16px;
}

.price-amount span {
  font-size: 0.9rem;
  color: var(--text-sub-light);
  font-weight: 400;
}

.price-features {
  margin: 20px 0 30px 0;
  flex-grow: 1;
}

.price-features li {
  padding: 8px 0;
  font-size: 0.95rem;
  color: var(--text-sub-light);
  display: flex;
  align-items: center;
  gap: 10px;
}

.price-features li::before {
  content: "✓";
  color: #10b981;
  font-weight: 800;
}

.btn-plan {
  display: block;
  text-align: center;
  background: #0f172a;
  color: #fff;
  padding: 12px;
  border-radius: 8px;
  font-weight: 600;
  transition: var(--transition-fast);
}

.price-card.popular .btn-plan {
  background: var(--primary-color);
}

.btn-plan:hover {
  opacity: 0.9;
}

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

.article-card {
  background: #fff;
  border: 1px solid #e2e8f0;
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
  transition: var(--transition-fast);
}

.article-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 18px -3px rgba(0, 0, 0, 0.1);
}

.article-body {
  padding: 24px;
}

.article-tag {
  display: inline-block;
  background: #eff6ff;
  color: var(--primary-color);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 6px;
  margin-bottom: 12px;
}

.article-title {
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 10px;
  color: var(--text-main-light);
}

.article-excerpt {
  font-size: 0.9rem;
  color: var(--text-sub-light);
  line-height: 1.6;
  margin-bottom: 16px;
}

.article-meta {
  font-size: 0.85rem;
  color: #94a3b8;
  display: flex;
  justify-content: space-between;
  border-top: 1px solid #f1f5f9;
  padding-top: 12px;
}

/* Testimonials Section */
.testimonials-section {
  background: #0a0f24;
  color: #fff;
}

.testimonials-section .section-title {
  color: #fff;
}

.testimonials-section .section-subtitle {
  color: var(--text-sub-dark);
}

.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.testimonial-card {
  background: var(--card-bg-dark);
  border: 1px solid var(--card-border-dark);
  border-radius: var(--border-radius);
  padding: 28px;
}

.user-info {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.user-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, #3b82f6, #06b6d4);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: #fff;
}

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

.user-role {
  font-size: 0.8rem;
  color: var(--text-sub-dark);
}

.rating {
  color: #fbbf24;
  margin-bottom: 12px;
}

.testimonial-text {
  font-size: 0.95rem;
  line-height: 1.6;
  color: #cbd5e1;
}

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

.faq-item {
  background: #fff;
  border: 1px solid #e2e8f0;
  border-radius: 10px;
  margin-bottom: 16px;
  overflow: hidden;
}

.faq-question {
  padding: 20px 24px;
  font-weight: 600;
  font-size: 1.05rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  user-select: none;
}

.faq-question::after {
  content: "+";
  font-size: 1.5rem;
  color: var(--primary-color);
  transition: transform 0.3s ease;
}

.faq-item.active .faq-question::after {
  content: "−";
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
  background: #fafafa;
  color: var(--text-sub-light);
  line-height: 1.7;
  font-size: 0.95rem;
}

.faq-item.active .faq-answer {
  max-height: 300px;
  padding: 0 24px 20px 24px;
}

/* Article Page Layout */
.article-header {
  background: linear-gradient(180deg, var(--bg-dark-top) 0%, var(--bg-dark-bottom) 100%);
  color: #fff;
  padding: 130px 0 60px 0;
}

.article-content {
  padding: 60px 0;
  max-width: 880px;
  margin: 0 auto;
  line-height: 1.8;
  font-size: 1.05rem;
  color: #334155;
}

.article-content h1 {
  font-size: 2.2rem;
  margin-bottom: 20px;
  color: #0f172a;
}

.article-content h2 {
  font-size: 1.6rem;
  margin: 32px 0 16px 0;
  color: #1e293b;
  border-bottom: 2px solid #eff6ff;
  padding-bottom: 8px;
}

.article-content h3 {
  font-size: 1.3rem;
  margin: 24px 0 12px 0;
  color: #334155;
}

.article-content p {
  margin-bottom: 20px;
}

.article-content ul, .article-content ol {
  margin-bottom: 20px;
  padding-left: 24px;
}

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

.article-cta-box {
  background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
  border: 1px solid #bfdbfe;
  border-radius: var(--border-radius);
  padding: 28px;
  margin: 40px 0;
  text-align: center;
}

.article-cta-box h3 {
  margin-top: 0;
  color: #1e40af;
}

.related-articles {
  margin-top: 60px;
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  border-radius: var(--border-radius);
  padding: 30px;
}

/* Footer Section & PBN Links (Core Task 2) */
footer {
  background: #070b19;
  color: #94a3b8;
  padding: 50px 0 30px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  text-align: center;
}

.footer-nav {
  display: flex;
  justify-content: center;
  gap: 24px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.footer-nav a {
  color: #cbd5e1;
  font-size: 0.9rem;
  transition: var(--transition-fast);
}

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

/* Precise PBN Links styling */
.friend-links {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 20px;
  margin: 20px 0;
  font-size: 0.82rem;
  color: #64748b;
}

.friend-links span {
  color: #475569;
}

.friend-links a {
  color: #64748b;
  text-decoration: none;
  transition: color 0.3s ease;
}

.friend-links a:hover {
  color: #94a3b8;
}

.copyright {
  font-size: 0.85rem;
  color: #475569;
  margin-top: 15px;
}

/* Responsive Media Queries */
@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .hero-actions {
    justify-content: center;
  }
  .hero-graphic {
    margin-top: 30px;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background: #0a0f24;
    flex-direction: column;
    padding: 20px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  }
  .nav-menu.active {
    display: flex;
  }
  .mobile-toggle {
    display: block;
  }
  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
  }
  .hero-content h1 {
    font-size: 2.1rem;
  }
  .price-card.popular {
    transform: none;
  }
}