/* ==========================================================================
   X云 - Light Pastel Purple (柔和淡紫全息) Master Theme CSS
   ========================================================================== */

:root {
  --bg-primary: #faf7fd;
  --bg-secondary: #f3ecf9;
  --bg-card: #ffffff;
  --bg-card-hover: #ffffff;
  --bg-footer: #efe6f8;
  
  --border-color: #e6d8f5;
  --border-hover: #c084fc;
  
  --text-primary: #2e1065;
  --text-secondary: #58497a;
  --text-muted: #8b79a9;
  
  --pastel-purple: #9333ea;
  --pastel-purple-light: #c084fc;
  --pastel-purple-dark: #6b21a8;
  --pastel-lavender: #f3e8ff;
  
  --gradient-pastel: linear-gradient(135deg, #a855f7 0%, #7e22ce 100%);
  --gradient-soft: linear-gradient(135deg, #c084fc 0%, #9333ea 50%, #6b21a8 100%);
  --gradient-text: linear-gradient(135deg, #7e22ce 0%, #9333ea 50%, #3b0764 100%);
  --gradient-card-border: linear-gradient(135deg, #d8b4fe, #a855f7, #818cf8);
  
  --shadow-sm: 0 4px 12px rgba(147, 51, 234, 0.05);
  --shadow-md: 0 8px 24px rgba(147, 51, 234, 0.08);
  --shadow-lg: 0 16px 40px rgba(147, 51, 234, 0.12);
  --shadow-glow: 0 0 25px rgba(168, 85, 247, 0.3);
  
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-xl: 24px;
  --radius-full: 9999px;
  
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
}

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

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

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

a {
  color: var(--pastel-purple);
  text-decoration: none;
  transition: all 0.25s ease;
}

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

.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Typography Helpers */
.pastel-text {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.8rem 1.75rem;
  font-size: 0.98rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  cursor: pointer;
  border: none;
  text-align: center;
  white-space: nowrap;
}

.btn-primary {
  background: var(--gradient-pastel);
  color: #ffffff !important;
  box-shadow: 0 4px 16px rgba(147, 51, 234, 0.25);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(147, 51, 234, 0.4);
  filter: brightness(1.08);
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-primary) !important;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  border-color: var(--pastel-purple);
  color: var(--pastel-purple) !important;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* Site Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(250, 247, 253, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  padding: 0.85rem 0;
}

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

.logo {
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  letter-spacing: -0.02em;
}

.logo-badge {
  font-size: 0.68rem;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-full);
  background: var(--pastel-lavender);
  color: var(--pastel-purple-dark);
  font-weight: 700;
  letter-spacing: 0.05em;
  border: 1px solid #e2d4f3;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
}

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

.nav-links a:hover {
  color: var(--pastel-purple);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* Mobile Nav */
.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  flex-direction: column;
  gap: 5px;
  padding: 4px;
}

.mobile-menu-btn span {
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all 0.3s ease;
}

.mobile-nav-overlay {
  display: none;
  position: fixed;
  top: 60px;
  left: 0;
  right: 0;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border-color);
  padding: 1.5rem;
  flex-direction: column;
  gap: 1rem;
  box-shadow: var(--shadow-lg);
  z-index: 999;
}

.mobile-nav-overlay.active {
  display: flex;
}

/* Hero Section */
.hero-section {
  padding: 5rem 0 4rem;
  position: relative;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 3.5rem;
  align-items: center;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 1rem;
  border-radius: var(--radius-full);
  background: var(--pastel-lavender);
  border: 1px solid #e2d4f3;
  color: var(--pastel-purple-dark);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  margin-bottom: 1.25rem;
}

.hero-tag-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--pastel-purple);
  box-shadow: 0 0 10px var(--pastel-purple);
}

.hero-title {
  font-size: 3.25rem;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 1.25rem;
  color: var(--text-primary);
}

.hero-desc {
  font-size: 1.125rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 2.5rem;
}

.hero-stats {
  display: flex;
  align-items: center;
  gap: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-color);
}

.stat-item-num {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--pastel-purple);
  line-height: 1;
}

.stat-item-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 0.35rem;
}

/* Radar Card */
.radar-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 1.75rem;
  box-shadow: var(--shadow-lg);
  position: relative;
}

.radar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-color);
}

.radar-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.radar-live-badge {
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-full);
  background: #ecfdf5;
  color: #059669;
  border: 1px solid #a7f3d0;
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.radar-live-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #10b981;
  animation: pulse 1.5s infinite;
}

@keyframes pulse {
  0% { opacity: 0.4; }
  50% { opacity: 1; }
  100% { opacity: 0.4; }
}

.node-list {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.node-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.85rem 1rem;
  border-radius: var(--radius-md);
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  transition: all 0.25s ease;
}

.node-item:hover {
  border-color: var(--pastel-purple-light);
  transform: translateX(4px);
  box-shadow: var(--shadow-sm);
}

.node-name {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
}

.node-type {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.node-ping-pill {
  font-size: 0.82rem;
  font-weight: 700;
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-full);
  background: var(--pastel-lavender);
  color: var(--pastel-purple-dark);
  border: 1px solid #e2d4f3;
}

/* Section Header */
.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 3.5rem;
}

.section-tag {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--pastel-purple);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.5rem;
  display: block;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: 0.85rem;
}

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

/* Section Layouts */
.section {
  padding: 5rem 0;
}

/* Bento Features */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  transition: all 0.3s ease;
  position: relative;
}

.feature-card:hover {
  transform: translateY(-5px);
  border-color: var(--pastel-purple-light);
  box-shadow: var(--shadow-md);
}

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: var(--pastel-lavender);
  color: var(--pastel-purple);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 1.25rem;
  border: 1px solid #e2d4f3;
}

.feature-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.65rem;
}

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

/* Node Network Grid */
.nodes-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.node-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  transition: all 0.3s ease;
}

.node-card:hover {
  transform: translateY(-4px);
  border-color: var(--pastel-purple-light);
  box-shadow: var(--shadow-md);
}

.node-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.node-flag {
  font-size: 1.75rem;
}

.node-card-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
}

.node-card-detail {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-top: 0.25rem;
}

/* AI & Stream Section */
.ai-stream-box {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 3rem;
  box-shadow: var(--shadow-md);
}

.ai-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
  margin-top: 2rem;
}

.ai-chip {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 1.25rem;
  border-radius: var(--radius-md);
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  font-weight: 600;
  color: var(--text-primary);
  transition: all 0.25s ease;
}

.ai-chip:hover {
  border-color: var(--pastel-purple);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.ai-chip-icon {
  font-size: 1.25rem;
}

/* Pricing Grid */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 2.5rem 2rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all 0.3s ease;
}

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

.pricing-card.popular {
  border: 2px solid var(--pastel-purple);
  box-shadow: var(--shadow-md);
}

.popular-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--gradient-pastel);
  color: #ffffff;
  font-size: 0.78rem;
  font-weight: 700;
  padding: 0.25rem 1rem;
  border-radius: var(--radius-full);
  letter-spacing: 0.05em;
  box-shadow: 0 4px 12px rgba(147, 51, 234, 0.3);
}

.pricing-title {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.pricing-price {
  font-size: 2.75rem;
  font-weight: 900;
  color: var(--pastel-purple-dark);
  margin: 1rem 0 0.5rem;
  line-height: 1;
}

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

.pricing-features {
  list-style: none;
  margin: 1.75rem 0 2rem;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  flex-grow: 1;
}

.pricing-features li {
  font-size: 0.95rem;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.pricing-features li::before {
  content: "✓";
  color: var(--pastel-purple);
  font-weight: 800;
}

/* Articles Section */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: all 0.3s ease;
}

.article-card:hover {
  transform: translateY(-5px);
  border-color: var(--pastel-purple-light);
  box-shadow: var(--shadow-md);
}

.article-tag {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--pastel-purple);
  background: var(--pastel-lavender);
  padding: 0.2rem 0.65rem;
  border-radius: var(--radius-full);
  align-self: flex-start;
  margin-bottom: 0.85rem;
  border: 1px solid #e2d4f3;
}

.article-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.65rem;
  line-height: 1.4;
}

.article-excerpt {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1.25rem;
  flex-grow: 1;
}

.article-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.82rem;
  color: var(--text-muted);
  padding-top: 1rem;
  border-top: 1px solid var(--border-color);
}

/* FAQ Accordion */
.faq-list {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.faq-question {
  width: 100%;
  text-align: left;
  padding: 1.25rem 1.5rem;
  background: none;
  border: none;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.faq-icon {
  font-size: 1.2rem;
  transition: transform 0.3s ease;
  color: var(--pastel-purple);
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
  padding: 0 1.5rem;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
}

.faq-item.active .faq-answer {
  max-height: 500px;
  padding: 0 1.5rem 1.25rem;
}

/* Article & Subpage Layout */
.article-header {
  padding: 4.5rem 0 2.5rem;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
}

.breadcrumb a {
  color: var(--text-secondary);
}

.breadcrumb a:hover {
  color: var(--pastel-purple);
}

.article-content {
  padding: 3.5rem 0 6rem;
  max-width: 860px;
  margin: 0 auto;
}

.article-body {
  font-size: 1.08rem;
  line-height: 1.85;
  color: var(--text-primary);
}

.article-body p:first-of-type::first-letter {
  font-size: 3.5rem;
  float: left;
  line-height: 0.85;
  padding-top: 4px;
  padding-right: 12px;
  font-weight: 900;
  color: var(--pastel-purple);
}

.article-body h2 {
  font-size: 1.75rem;
  font-weight: 800;
  margin: 2.75rem 0 1.25rem;
  color: var(--text-primary);
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.5rem;
}

.article-body h3 {
  font-size: 1.35rem;
  font-weight: 700;
  margin: 2rem 0 0.85rem;
  color: var(--text-primary);
}

.article-body p {
  margin-bottom: 1.5rem;
  color: var(--text-secondary);
}

.article-body ul, .article-body ol {
  margin-bottom: 1.75rem;
  padding-left: 1.75rem;
  color: var(--text-secondary);
}

.article-body li {
  margin-bottom: 0.6rem;
}

.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 2rem 0;
  font-size: 0.95rem;
  background: var(--bg-card);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.article-body th, .article-body td {
  border: 1px solid var(--border-color);
  padding: 0.85rem 1.1rem;
  text-align: left;
}

.article-body th {
  background: var(--pastel-lavender);
  font-weight: 700;
  color: var(--pastel-purple-dark);
}

.article-body blockquote {
  border-left: 4px solid var(--pastel-purple);
  padding: 1.25rem 1.75rem;
  background: var(--pastel-lavender);
  font-style: italic;
  font-size: 1.05rem;
  margin: 2rem 0;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text-primary);
}

.related-articles {
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
}

/* Site Footer */
.site-footer {
  background: var(--bg-footer);
  border-top: 1px solid var(--border-color);
  padding: 4.5rem 0 2.5rem;
  color: var(--text-secondary);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3.5rem;
}

.footer-brand h3 {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 0.85rem;
}

.footer-brand p {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.6;
  max-width: 320px;
}

.footer-group h4 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 1.1rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.footer-group ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

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

.footer-group a:hover {
  color: var(--pastel-purple);
}

.footer-bottom {
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.88rem;
}

.recommended-sites {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.recommended-sites a {
  color: var(--text-secondary);
  font-weight: 500;
}

.recommended-sites a:hover {
  color: var(--pastel-purple);
}

/* Responsive Media Queries */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
  .features-grid, .pricing-grid, .articles-grid, .ai-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .nodes-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .nav-links, .nav-actions .btn {
    display: none;
  }
  .mobile-menu-btn {
    display: flex;
  }
  .hero-title {
    font-size: 2.25rem;
  }
  .features-grid, .pricing-grid, .articles-grid, .ai-grid, .nodes-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}