/* 夜煞云机场 (Night Fury Cloud Airport) - Thunderstorm Cloud & Lightning Veil Theme */
:root {
  --bg-dark: #07050e;
  --bg-darker: #040308;
  --bg-card: rgba(18, 14, 32, 0.65);
  --bg-card-hover: rgba(28, 20, 52, 0.85);
  --bg-glass-strong: rgba(26, 18, 48, 0.85);
  --border-glass: rgba(157, 78, 221, 0.22);
  --border-glow: rgba(0, 240, 255, 0.5);
  --border-active: #9d4edd;
  
  --purple-glow: #9d4edd;
  --purple-deep: #7b2cbf;
  --electric-cyan: #00f0ff;
  --lightning-white: #f8f9fa;
  --text-main: #e2e8f0;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  
  --font-main: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --shadow-glow: 0 0 25px rgba(157, 78, 221, 0.35);
  --shadow-cyan: 0 0 25px rgba(0, 240, 255, 0.3);
  --transition-fast: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
  background-color: var(--bg-dark);
  color: var(--text-main);
  font-family: var(--font-main);
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
}

/* Background Canvas & Overlay */
#rain-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 1;
}

.cloud-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: 
    radial-gradient(circle at 50% 10%, rgba(157, 78, 221, 0.12) 0%, transparent 60%),
    radial-gradient(circle at 80% 60%, rgba(0, 240, 255, 0.08) 0%, transparent 50%),
    radial-gradient(circle at 20% 80%, rgba(123, 44, 191, 0.15) 0%, transparent 50%);
  pointer-events: none;
  z-index: 2;
}

.page-wrapper {
  position: relative;
  z-index: 3;
}

/* Container */
.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Typography & General */
h1, h2, h3, h4, h5, h6 {
  color: var(--lightning-white);
  font-weight: 700;
  line-height: 1.3;
}

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

a:hover {
  color: #80f7ff;
  text-shadow: 0 0 8px rgba(0, 240, 255, 0.6);
}

.text-gradient {
  background: linear-gradient(135deg, #ffffff 0%, #d8b4fe 50%, #00f0ff 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.text-purple {
  color: var(--purple-glow);
}

.text-cyan {
  color: var(--electric-cyan);
}

/* Glass Card Component */
.glass-card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  padding: 28px;
  position: relative;
  overflow: hidden;
  transition: var(--transition-fast);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

.glass-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
}

.glass-card:hover {
  background: var(--bg-card-hover);
  border-color: rgba(157, 78, 221, 0.45);
  box-shadow: 0 12px 40px rgba(157, 78, 221, 0.2);
  transform: translateY(-4px);
}

/* Header & Navbar */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(7, 5, 14, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(157, 78, 221, 0.15);
  padding: 16px 0;
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--lightning-white);
  letter-spacing: 0.5px;
}

.brand-logo svg {
  width: 32px;
  height: 32px;
  filter: drop-shadow(0 0 8px #9d4edd);
}

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

.nav-links a {
  color: var(--text-main);
  font-weight: 500;
  font-size: 0.95rem;
  position: relative;
}

.nav-links a:hover {
  color: var(--lightning-white);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0%;
  height: 2px;
  background: var(--electric-cyan);
  transition: var(--transition-fast);
  box-shadow: 0 0 8px var(--electric-cyan);
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition-fast);
  border: none;
  outline: none;
  text-align: center;
}

.btn-primary {
  background: linear-gradient(135deg, #7b2cbf 0%, #9d4edd 50%, #240046 100%);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.3);
  box-shadow: 0 4px 20px rgba(157, 78, 221, 0.4);
  position: relative;
  overflow: hidden;
}

.btn-primary::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: linear-gradient(45deg, transparent, rgba(255, 255, 255, 0.3), transparent);
  transform: rotate(45deg) translateY(-100%);
  transition: transform 0.6s ease;
}

.btn-primary:hover::before {
  transform: rotate(45deg) translateY(100%);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #9d4edd 0%, #c77dff 50%, #7b2cbf 100%);
  box-shadow: 0 0 30px rgba(157, 78, 221, 0.7), 0 0 15px rgba(0, 240, 255, 0.5);
  color: #ffffff;
  transform: translateY(-2px);
}

.btn-glow {
  background: linear-gradient(135deg, #2563eb 0%, #7c3aed 100%);
  color: #ffffff;
  box-shadow: 0 4px 18px rgba(124, 58, 237, 0.45);
}

.btn-glow:hover {
  background: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
  box-shadow: 0 0 25px rgba(59, 130, 246, 0.6);
  color: #ffffff;
  transform: translateY(-2px);
}

.btn-outline {
  background: rgba(255, 255, 255, 0.05);
  color: var(--lightning-white);
  border: 1px solid rgba(157, 78, 221, 0.4);
  backdrop-filter: blur(8px);
}

.btn-outline:hover {
  background: rgba(157, 78, 221, 0.25);
  border-color: var(--electric-cyan);
  box-shadow: 0 0 20px rgba(0, 240, 255, 0.3);
  color: #ffffff;
}

.mobile-menu-btn {
  display: none;
  background: transparent;
  border: none;
  color: var(--lightning-white);
  font-size: 1.5rem;
  cursor: pointer;
}

/* Hero Section */
.hero {
  padding: 90px 0 70px;
  text-align: center;
  position: relative;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: rgba(157, 78, 221, 0.15);
  border: 1px solid rgba(157, 78, 221, 0.35);
  border-radius: 30px;
  font-size: 0.85rem;
  color: var(--electric-cyan);
  margin-bottom: 24px;
  backdrop-filter: blur(10px);
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 900;
  margin-bottom: 20px;
  letter-spacing: -1px;
  line-height: 1.15;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-muted);
  max-width: 820px;
  margin: 0 auto 36px;
  line-height: 1.7;
}

.hero-cta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  margin-bottom: 50px;
  flex-wrap: wrap;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  max-width: 960px;
  margin: 0 auto;
}

.stat-card {
  text-align: center;
  padding: 20px;
}

.stat-number {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--electric-cyan);
  margin-bottom: 4px;
  text-shadow: 0 0 12px rgba(0, 240, 255, 0.4);
}

.stat-label {
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* Core Advantages Section */
.section {
  padding: 80px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 56px;
}

.section-title {
  font-size: 2.4rem;
  margin-bottom: 14px;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 700px;
  margin: 0 auto;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-card {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.feature-icon {
  width: 54px;
  height: 54px;
  border-radius: 12px;
  background: rgba(157, 78, 221, 0.2);
  border: 1px solid rgba(157, 78, 221, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  color: var(--electric-cyan);
}

.feature-icon svg {
  width: 28px;
  height: 28px;
}

.feature-title {
  font-size: 1.25rem;
  margin-bottom: 12px;
}

.feature-desc {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* Pricing Section (Reference Aligned) */
.pricing-section {
  position: relative;
  background: radial-gradient(circle at 50% 50%, rgba(24, 16, 44, 0.6) 0%, transparent 80%);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  align-items: stretch;
}

.pricing-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  position: relative;
}

.pricing-card.featured {
  background: rgba(28, 20, 56, 0.85);
  border: 2px solid var(--purple-glow);
  box-shadow: 0 0 35px rgba(157, 78, 221, 0.4);
  transform: scale(1.03);
}

.popular-badge {
  position: absolute;
  top: 16px;
  right: 16px;
  background: linear-gradient(135deg, #7b2cbf, #9d4edd);
  color: #fff;
  padding: 4px 12px;
  font-size: 0.75rem;
  font-weight: 700;
  border-radius: 20px;
  letter-spacing: 0.5px;
}

.plan-header {
  margin-bottom: 24px;
}

.plan-name {
  font-size: 1.5rem;
  font-weight: 800;
  margin-bottom: 12px;
}

.plan-price-wrap {
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.plan-currency {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--electric-cyan);
}

.plan-price {
  font-size: 2.8rem;
  font-weight: 900;
  color: var(--electric-cyan);
  line-height: 1;
}

.plan-period {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.plan-features {
  list-style: none;
  margin: 28px 0;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.plan-features li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.95rem;
  color: var(--text-main);
}

.plan-features li svg {
  width: 18px;
  height: 18px;
  color: var(--electric-cyan);
  flex-shrink: 0;
}

/* Audiences Grid */
.audiences-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.audience-card {
  text-align: center;
  padding: 24px;
}

.audience-icon {
  font-size: 2.2rem;
  margin-bottom: 14px;
}

.audience-title {
  font-size: 1.1rem;
  margin-bottom: 8px;
}

.audience-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
}

/* Tutorials & Tabs Section */
.tutorial-tabs {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 32px;
  flex-wrap: wrap;
}

.tab-btn {
  padding: 10px 20px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(157, 78, 221, 0.25);
  border-radius: var(--radius-sm);
  color: var(--text-main);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-fast);
}

.tab-btn.active, .tab-btn:hover {
  background: rgba(157, 78, 221, 0.3);
  border-color: var(--electric-cyan);
  color: var(--lightning-white);
  box-shadow: 0 0 15px rgba(0, 240, 255, 0.25);
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

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

.step-card {
  position: relative;
}

.step-number {
  position: absolute;
  top: 16px;
  right: 16px;
  font-size: 2rem;
  font-weight: 900;
  color: rgba(157, 78, 221, 0.2);
}

.step-title {
  font-size: 1.15rem;
  margin-bottom: 10px;
  color: var(--electric-cyan);
}

.step-desc {
  font-size: 0.92rem;
  color: var(--text-muted);
}

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

.user-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, #7b2cbf, #00f0ff);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  color: #fff;
  font-size: 1.1rem;
  margin-bottom: 16px;
  box-shadow: 0 0 12px rgba(157, 78, 221, 0.5);
}

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

.user-name {
  font-weight: 700;
  font-size: 1rem;
}

.user-tag {
  font-size: 0.8rem;
  color: var(--electric-cyan);
}

.user-quote {
  font-size: 0.93rem;
  color: var(--text-muted);
  font-style: italic;
  line-height: 1.6;
}

/* FAQ Accordion */
.faq-list {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  background: var(--bg-card);
  overflow: hidden;
  transition: var(--transition-fast);
}

.faq-question {
  width: 100%;
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: transparent;
  border: none;
  color: var(--lightning-white);
  font-size: 1.05rem;
  font-weight: 600;
  text-align: left;
  cursor: pointer;
}

.faq-question svg {
  width: 20px;
  height: 20px;
  transition: transform 0.3s ease;
  color: var(--electric-cyan);
}

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

.faq-item.active .faq-answer {
  max-height: 1000px;
  padding: 0 24px 20px;
  transition: max-height 0.35s cubic-bezier(1, 0, 1, 0);
}

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

.article-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.82rem;
  color: var(--electric-cyan);
  margin-bottom: 12px;
}

.article-card-title {
  font-size: 1.15rem;
  margin-bottom: 12px;
  line-height: 1.4;
}

.article-excerpt {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 20px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-link {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--purple-glow);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.article-link:hover {
  color: var(--electric-cyan);
}

/* Article Detail Page Layout */
.article-header {
  padding: 60px 0 30px;
  text-align: center;
}

.breadcrumb {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 20px;
}

.article-page-title {
  font-size: 2.5rem;
  margin-bottom: 20px;
  line-height: 1.25;
}

.article-page-meta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  font-size: 0.9rem;
  color: var(--text-dim);
}

.article-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 40px;
  padding: 40px 0;
}

.article-content {
  font-size: 1.05rem;
  line-height: 1.85;
  color: #cbd5e1;
}

.article-content h2 {
  font-size: 1.7rem;
  margin: 40px 0 20px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(157, 78, 221, 0.25);
  color: var(--electric-cyan);
}

.article-content h3 {
  font-size: 1.35rem;
  margin: 30px 0 16px;
  color: var(--lightning-white);
}

.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 var(--purple-glow);
  background: rgba(157, 78, 221, 0.1);
  padding: 16px 20px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 24px 0;
  font-style: italic;
  color: var(--lightning-white);
}

.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 28px 0;
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.article-content th, .article-content td {
  padding: 14px 18px;
  text-align: left;
  border-bottom: 1px solid rgba(157, 78, 221, 0.15);
}

.article-content th {
  background: rgba(157, 78, 221, 0.25);
  color: var(--lightning-white);
  font-weight: 700;
}

.article-content tr:last-child td {
  border-bottom: none;
}

/* Sidebar & TOC */
.sidebar-box {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  padding: 24px;
  margin-bottom: 28px;
  position: sticky;
  top: 90px;
}

.sidebar-title {
  font-size: 1.15rem;
  margin-bottom: 16px;
  color: var(--electric-cyan);
  border-bottom: 1px solid rgba(157, 78, 221, 0.2);
  padding-bottom: 8px;
}

.toc-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 0.9rem;
}

.toc-list a {
  color: var(--text-muted);
}

.toc-list a:hover {
  color: var(--electric-cyan);
}

/* Footer */
.footer {
  background: var(--bg-darker);
  border-top: 1px solid rgba(157, 78, 221, 0.15);
  padding: 60px 0 30px;
  margin-top: 80px;
}

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

.footer-brand p {
  color: var(--text-muted);
  font-size: 0.92rem;
  margin: 16px 0;
  max-width: 320px;
}

.footer-title {
  font-size: 1.05rem;
  margin-bottom: 20px;
  color: var(--lightning-white);
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-links a {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.footer-links a:hover {
  color: var(--electric-cyan);
}

.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag-item {
  padding: 4px 10px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(157, 78, 221, 0.2);
  border-radius: 4px;
  font-size: 0.78rem;
  color: var(--text-muted);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--text-dim);
  flex-wrap: wrap;
  gap: 16px;
}

/* Responsive Breakdown */
@media (max-width: 1024px) {
  .features-grid, .pricing-grid, .articles-grid, .testimonials-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .audiences-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-card.featured {
    transform: none;
  }
  .article-layout {
    grid-template-columns: 1fr;
  }
  .sidebar-box {
    position: static;
  }
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .nav-links, .nav-actions {
    display: none;
  }
  .mobile-menu-btn {
    display: block;
  }
  .mobile-menu {
    display: flex;
    flex-direction: column;
    gap: 16px;
    padding: 20px;
    background: var(--bg-glass-strong);
    border-bottom: 1px solid var(--border-glass);
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    z-index: 99;
  }
  .hero-title {
    font-size: 2.2rem;
  }
  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
  }
  .features-grid, .pricing-grid, .articles-grid, .testimonials-grid, .step-list {
    grid-template-columns: 1fr;
  }
  .audiences-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
}