/* ==========================================================================
   FatCatCloud 肥猫云 - 高端独创落地页及博客集群全套 CSS 样式
   ========================================================================== */

:root {
  --primary-blue: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-light: #eff6ff;
  --accent-cyan: #06b6d4;
  --accent-orange: #f59e0b;
  --accent-orange-hover: #d97706;
  --text-dark: #0f172a;
  --text-main: #334155;
  --text-muted: #64748b;
  --bg-light: #f8fafc;
  --bg-white: #ffffff;
  --border-color: #e2e8f0;
  --card-shadow: 0 10px 30px -5px rgba(37, 99, 235, 0.08), 0 4px 6px -2px rgba(0, 0, 0, 0.02);
  --card-shadow-hover: 0 20px 40px -10px rgba(37, 99, 235, 0.18), 0 8px 10px -4px rgba(0, 0, 0, 0.04);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 24px;
  --radius-full: 9999px;
  --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --max-width: 1240px;
}

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

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);
  background-color: var(--bg-white);
  line-height: 1.6;
}

body {
  overflow-x: hidden;
  background-color: var(--bg-white);
}

a {
  color: var(--primary-blue);
  text-decoration: none;
  transition: var(--transition-smooth);
}

a:hover {
  color: var(--primary-dark);
}

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

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ==========================================================================
   Header 顶部导航栏
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(226, 232, 240, 0.8);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
}

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

.brand-logo img {
  width: 42px;
  height: 42px;
  object-fit: contain;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

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

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

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

/* 按钮通用设计 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  font-size: 0.95rem;
  font-weight: 700;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: var(--transition-smooth);
  text-decoration: none;
  border: 2px solid transparent;
  gap: 8px;
}

.btn-primary {
  background: linear-gradient(135deg, #2563eb 0%, #06b6d4 100%);
  color: #ffffff !important;
  box-shadow: 0 6px 20px rgba(37, 99, 235, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 25px rgba(37, 99, 235, 0.45);
}

.btn-secondary {
  background-color: var(--primary-light);
  color: var(--primary-blue) !important;
  border-color: rgba(37, 99, 235, 0.2);
}

.btn-secondary:hover {
  background-color: #dbeafe;
  transform: translateY(-1px);
}

.btn-orange {
  background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
  color: #ffffff !important;
  box-shadow: 0 6px 20px rgba(245, 158, 11, 0.3);
}

.btn-orange:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 25px rgba(245, 158, 11, 0.45);
}

.btn-sm {
  padding: 8px 20px;
  font-size: 0.88rem;
}

.btn-lg {
  padding: 14px 34px;
  font-size: 1.05rem;
}

/* ==========================================================================
   Hero 头部 Banner 独创视觉区
   ========================================================================== */
.hero-section {
  padding: 80px 0 100px;
  background: radial-gradient(circle at 80% 20%, rgba(37, 99, 235, 0.06) 0%, rgba(255, 255, 255, 0) 50%),
              radial-gradient(circle at 20% 80%, rgba(6, 182, 212, 0.06) 0%, rgba(255, 255, 255, 0) 50%);
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: 48px;
  align-items: center;
}

.hero-pill-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(37, 99, 235, 0.08);
  border: 1px solid rgba(37, 99, 235, 0.2);
  color: var(--primary-blue);
  padding: 6px 18px;
  border-radius: var(--radius-full);
  font-size: 0.88rem;
  font-weight: 700;
  margin-bottom: 24px;
}

.hero-pill-badge span.pulse-dot {
  width: 8px;
  height: 8px;
  background-color: #10b981;
  border-radius: 50%;
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.2);
}

.hero-content h1 {
  font-size: 3.5rem;
  font-weight: 900;
  line-height: 1.18;
  margin-bottom: 22px;
  color: var(--text-dark);
  letter-spacing: -1.5px;
}

.hero-content h1 span.gradient-span {
  background: linear-gradient(135deg, #2563eb 0%, #06b6d4 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.2rem;
  color: var(--text-muted);
  margin-bottom: 38px;
  line-height: 1.65;
  max-width: 560px;
}

.hero-buttons-group {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  margin-bottom: 36px;
}

.hero-stats-row {
  display: flex;
  gap: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--border-color);
}

.stat-item-box h4 {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--text-dark);
}

.stat-item-box p {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 600;
}

/* 实时加速仪表盘 UI Showcase */
.dashboard-showcase-card {
  background: #0f172a;
  border-radius: var(--radius-lg);
  border: 1px solid #1e293b;
  padding: 28px;
  box-shadow: 0 25px 50px -12px rgba(15, 23, 42, 0.35);
  color: #f8fafc;
  position: relative;
}

.showcase-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid #1e293b;
}

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

.window-dots span {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.dot-red { background: #ef4444; }
.dot-yellow { background: #f59e0b; }
.dot-green { background: #10b981; }

.status-live-tag {
  background: rgba(16, 185, 129, 0.15);
  color: #34d399;
  border: 1px solid rgba(16, 185, 129, 0.3);
  padding: 4px 12px;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 700;
}

.node-status-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 24px;
}

.node-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(255, 255, 255, 0.04);
  padding: 14px 18px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.node-info-flag {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 600;
  font-size: 0.95rem;
}

.node-ping {
  color: #34d399;
  font-family: monospace;
  font-weight: 700;
  font-size: 0.95rem;
}

/* ==========================================================================
   Section 通用标题
   ========================================================================== */
.section {
  padding: 95px 0;
}

.section-bg-light {
  background-color: var(--bg-light);
}

.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 64px;
}

.section-tag {
  display: inline-block;
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--primary-blue);
  background: var(--primary-light);
  padding: 6px 16px;
  border-radius: var(--radius-full);
  margin-bottom: 16px;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 900;
  color: var(--text-dark);
  line-height: 1.22;
  margin-bottom: 18px;
  letter-spacing: -1px;
}

.section-desc {
  font-size: 1.1rem;
  color: var(--text-muted);
}

/* ==========================================================================
   Features 平台核心优势 Section
   ========================================================================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.feature-card-custom {
  background: var(--bg-white);
  padding: 44px 36px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  box-shadow: var(--card-shadow);
  transition: var(--transition-smooth);
}

.feature-card-custom:hover {
  transform: translateY(-8px);
  box-shadow: var(--card-shadow-hover);
  border-color: rgba(37, 99, 235, 0.3);
}

.feature-icon-box {
  width: 72px;
  height: 72px;
  border-radius: 20px;
  margin-bottom: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.icon-box-blue {
  background: #eff6ff;
  color: #2563eb;
}

.icon-box-cyan {
  background: #ecfeff;
  color: #0891b2;
}

.icon-box-purple {
  background: #faf5ff;
  color: #9333ea;
}

.feature-card-custom h3 {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text-dark);
  margin-bottom: 14px;
}

.feature-card-custom p {
  font-size: 0.98rem;
  color: var(--text-muted);
  line-height: 1.7;
}

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

.pricing-card {
  background: var(--bg-white);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  padding: 38px 28px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: var(--transition-smooth);
  box-shadow: var(--card-shadow);
}

.pricing-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--card-shadow-hover);
}

.pricing-card.popular {
  border: 2px solid var(--primary-blue);
  box-shadow: 0 16px 35px -5px rgba(37, 99, 235, 0.25);
  transform: scale(1.03);
}

.popular-badge {
  position: absolute;
  top: -15px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, #2563eb 0%, #06b6d4 100%);
  color: #ffffff;
  font-size: 0.78rem;
  font-weight: 800;
  padding: 5px 18px;
  border-radius: var(--radius-full);
  letter-spacing: 0.5px;
}

.pricing-name {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-dark);
  margin-bottom: 8px;
}

.pricing-cycle {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.pricing-price {
  font-size: 2.6rem;
  font-weight: 900;
  color: var(--text-dark);
  margin-bottom: 24px;
  display: flex;
  align-items: baseline;
}

.pricing-price span.currency {
  font-size: 1.4rem;
  font-weight: 700;
  margin-right: 4px;
}

.pricing-price span.unit {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-muted);
  margin-left: 4px;
}

.pricing-features {
  list-style: none;
  margin-bottom: 36px;
  flex-grow: 1;
}

.pricing-features li {
  font-size: 0.92rem;
  color: var(--text-main);
  padding: 10px 0;
  display: flex;
  align-items: center;
  gap: 10px;
  border-bottom: 1px dashed #f1f5f9;
}

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

/* Scenarios */
.scenarios-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.scenario-card {
  background: var(--bg-white);
  padding: 30px 26px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  transition: var(--transition-smooth);
}

.scenario-card:hover {
  transform: translateY(-5px);
  border-color: var(--primary-blue);
  box-shadow: var(--card-shadow);
}

.scenario-icon {
  font-size: 2.4rem;
  margin-bottom: 18px;
}

.scenario-title {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--text-dark);
  margin-bottom: 10px;
}

.scenario-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* Articles Grid */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.article-card {
  background: var(--bg-white);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  overflow: hidden;
  box-shadow: var(--card-shadow);
  transition: var(--transition-smooth);
  display: flex;
  flex-direction: column;
}

.article-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--card-shadow-hover);
}

.article-card-body {
  padding: 26px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.article-tag {
  display: inline-block;
  align-self: flex-start;
  font-size: 0.75rem;
  font-weight: 800;
  color: var(--primary-blue);
  background: var(--primary-light);
  padding: 4px 12px;
  border-radius: var(--radius-full);
  margin-bottom: 14px;
}

.article-card-title {
  font-size: 1.18rem;
  font-weight: 800;
  color: var(--text-dark);
  line-height: 1.45;
  margin-bottom: 12px;
}

.article-card-title a {
  color: inherit;
}

.article-card-title a:hover {
  color: var(--primary-blue);
}

.article-card-excerpt {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 22px;
  flex-grow: 1;
}

.article-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 16px;
  border-top: 1px solid #f1f5f9;
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Reviews & FAQ */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.review-card {
  background: var(--bg-white);
  padding: 32px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  box-shadow: var(--card-shadow);
}

.review-stars {
  color: #f59e0b;
  font-size: 1.1rem;
  margin-bottom: 16px;
}

.review-text {
  font-size: 0.96rem;
  color: var(--text-dark);
  line-height: 1.7;
  margin-bottom: 24px;
  font-style: italic;
}

.review-user {
  display: flex;
  align-items: center;
  gap: 14px;
}

.review-avatar {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: linear-gradient(135deg, #2563eb 0%, #06b6d4 100%);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.15rem;
}

.review-user-info h4 {
  font-size: 0.98rem;
  font-weight: 800;
  color: var(--text-dark);
}

.review-user-info p {
  font-size: 0.82rem;
  color: var(--text-muted);
}

.faq-accordion {
  max-width: 840px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.faq-item {
  background: var(--bg-white);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition-smooth);
}

.faq-question {
  padding: 22px 28px;
  font-size: 1.08rem;
  font-weight: 800;
  color: var(--text-dark);
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  user-select: none;
}

.faq-question svg {
  transition: transform 0.3s ease;
  color: var(--primary-blue);
  flex-shrink: 0;
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s cubic-bezier(0, 1, 0, 1);
  background-color: #fafafa;
}

.faq-item.active .faq-answer {
  max-height: 1000px;
  transition: max-height 0.5s ease-in-out;
  border-top: 1px solid #f1f5f9;
}

.faq-answer-inner {
  padding: 22px 28px;
  font-size: 0.98rem;
  color: var(--text-muted);
  line-height: 1.75;
}

/* Footer & PBN Links Pipeline */
.site-footer {
  background-color: #0f172a;
  color: #94a3b8;
  padding: 64px 0 32px;
  border-top: 1px solid #1e293b;
  font-size: 0.92rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 40px;
  margin-bottom: 52px;
}

.footer-brand .brand-logo {
  color: #ffffff;
  margin-bottom: 18px;
}

.footer-brand p {
  color: #94a3b8;
  line-height: 1.65;
  max-width: 320px;
}

.footer-heading {
  font-size: 1.08rem;
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 22px;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.footer-links a {
  color: #94a3b8;
  transition: var(--transition-smooth);
}

.footer-links a:hover {
  color: #ffffff;
}

.footer-bottom {
  border-top: 1px solid #1e293b;
  padding-top: 32px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.footer-pbn-links {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  font-size: 0.85rem;
  color: #64748b;
  margin-bottom: 4px;
}

.footer-pbn-links span.pbn-label {
  color: #475569;
}

.footer-pbn-links a {
  color: #64748b;
  text-decoration: none;
  transition: color 0.2s ease;
  font-weight: 400;
}

.footer-pbn-links a:hover {
  color: #94a3b8;
  text-decoration: underline;
}

.copyright {
  font-size: 0.88rem;
  color: #64748b;
}

/* Responsive */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .hero-buttons-group, .hero-stats-row {
    justify-content: center;
  }
  .hero-subtitle {
    margin-left: auto;
    margin-right: auto;
  }
  .features-grid {
    grid-template-columns: 1fr;
  }
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .scenarios-grid, .articles-grid, .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 640px) {
  .header-container {
    height: 70px;
  }
  .nav-menu {
    display: none;
  }
  .hero-content h1 {
    font-size: 2.3rem;
  }
  .pricing-grid, .scenarios-grid, .articles-grid, .reviews-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
}

/* Standard Article layout helpers */
.article-page-header { background: #f8fafc; padding: 60px 0 40px; border-bottom: 1px solid #e2e8f0; }
.breadcrumb { display: flex; gap: 8px; font-size: 0.88rem; color: #94a3b8; margin-bottom: 16px; }
.breadcrumb a { color: #64748b; }
.breadcrumb a:hover { color: #2563eb; }
.article-title-heading { font-size: 2.3rem; font-weight: 800; color: #0f172a; line-height: 1.3; margin-bottom: 16px; }
.article-meta-info { display: flex; gap: 16px; font-size: 0.88rem; color: #64748b; }
.article-body-container { padding: 60px 0 90px; }
.article-layout { display: grid; grid-template-columns: 1fr 320px; gap: 48px; }
.article-content { font-size: 1.05rem; line-height: 1.85; color: #334155; }
.article-content h2 { font-size: 1.6rem; font-weight: 700; color: #0f172a; margin: 36px 0 16px; }
.article-content h3 { font-size: 1.25rem; font-weight: 700; color: #1e293b; margin: 24px 0 12px; }
.article-content p { margin-bottom: 20px; }
.article-content ul, .article-content ol { margin: 0 0 24px 24px; }
.article-content li { margin-bottom: 8px; }
.article-content blockquote { border-left: 4px solid #2563eb; background: #eff6ff; padding: 18px 24px; border-radius: 0 12px 12px 0; margin: 24px 0; color: #1e3a8a; }
.article-cta-box { background: linear-gradient(135deg, #1d4ed8 0%, #2563eb 100%); color: #fff; padding: 32px; border-radius: 16px; margin: 36px 0; text-align: center; }
.article-cta-box h3 { color: #fff !important; font-size: 1.4rem; margin-top: 0 !important; margin-bottom: 12px; }
.article-cta-box p { color: #eff6ff; margin-bottom: 20px; }
.sidebar-widget { background: #f8fafc; border: 1px solid #e2e8f0; border-radius: 12px; padding: 24px; margin-bottom: 24px; }
.widget-title { font-size: 1.05rem; font-weight: 700; color: #0f172a; margin-bottom: 16px; padding-bottom: 8px; border-bottom: 1px solid #e2e8f0; }
.widget-list { list-style: none; display: flex; flex-direction: column; gap: 12px; }
.widget-list a { font-size: 0.92rem; color: #334155; }
.widget-list a:hover { color: #2563eb; }