/* ==========================================================================
   纷达网络 (fendawangluojc.homes) - Design System & Custom Styles
   Font: 正楷体 (STKaiti / KaiTi / 楷体)
   Theme: Vibrant Modern Light/Purple Glassmorphism Inspired by Yangfan Cloud
   ========================================================================== */

:root {
  /* Color Palette */
  --primary: #7c3aed;
  --primary-hover: #6d28d9;
  --primary-light: #f3e8ff;
  --primary-glow: rgba(124, 58, 237, 0.25);
  
  --accent: #ec4899;
  --accent-glow: rgba(236, 72, 153, 0.25);
  
  --secondary: #3b82f6;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  
  --bg-gradient: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 50%, #faf5ff 100%);
  --bg-card: rgba(255, 255, 255, 0.88);
  --bg-card-hover: #ffffff;
  
  --text-main: #1e293b;
  --text-muted: #64748b;
  --text-light: #94a3b8;
  
  --border-light: rgba(226, 232, 240, 0.8);
  --border-glow: rgba(124, 58, 237, 0.3);
  
  /* Typography - Mandatory KaiTi / 正楷体 */
  --font-family: 'STKaiti', 'KaiTi', '楷体', 'DFKai-SB', 'NSimSun', Georgia, serif;
  
  /* Elevative Shadows & Blur */
  --shadow-sm: 0 2px 8px rgba(149, 157, 165, 0.08);
  --shadow-md: 0 8px 24px rgba(149, 157, 165, 0.12);
  --shadow-lg: 0 16px 40px rgba(124, 58, 237, 0.15);
  --shadow-purple: 0 12px 32px rgba(124, 58, 237, 0.22);
  
  --glass-backdrop: blur(12px) saturate(180%);
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-full: 9999px;
  
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
  font-family: var(--font-family);
  background: #f8fafc;
  color: var(--text-main);
  line-height: 1.7;
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
}

/* Dynamic Background Canvas & Ambient Orbs */
#bg-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 0;
  opacity: 0.6;
}

.ambient-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  pointer-events: none;
  z-index: 0;
  opacity: 0.45;
  animation: floatOrb 12s ease-in-out infinite alternate;
}

.orb-1 {
  top: 5%;
  left: 10%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, #a855f7 0%, rgba(168, 85, 247, 0) 70%);
}

.orb-2 {
  top: 40%;
  right: 5%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, #3b82f6 0%, rgba(59, 130, 246, 0) 70%);
  animation-delay: -4s;
}

.orb-3 {
  bottom: 10%;
  left: 30%;
  width: 450px;
  height: 450px;
  background: radial-gradient(circle, #ec4899 0%, rgba(236, 72, 153, 0) 70%);
  animation-delay: -8s;
}

@keyframes floatOrb {
  0% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(30px, -40px) scale(1.08); }
  100% { transform: translate(-20px, 30px) scale(0.95); }
}

/* Container */
.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

/* Typography & Headings */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-family);
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.3;
}

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

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

.text-gradient {
  background: linear-gradient(135deg, #6d28d9 0%, #a855f7 50%, #ec4899 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

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

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: var(--primary-light);
  color: var(--primary);
  border-radius: var(--radius-full);
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 12px;
  box-shadow: 0 2px 10px rgba(124, 58, 237, 0.1);
}

.section-title {
  font-size: 2.3rem;
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}

.section-desc {
  font-size: 1.15rem;
  color: var(--text-muted);
  max-width: 720px;
  margin: 0 auto;
}

/* Header & Navbar */
.navbar {
  position: sticky;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: var(--glass-backdrop);
  -webkit-backdrop-filter: var(--glass-backdrop);
  border-bottom: 1px solid var(--border-light);
  transition: var(--transition);
}

.navbar.scrolled {
  box-shadow: var(--shadow-md);
  background: rgba(255, 255, 255, 0.95);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-main);
  text-decoration: none;
}

.logo-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, #7c3aed, #ec4899);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 1.3rem;
  box-shadow: 0 4px 12px rgba(124, 58, 237, 0.3);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-links a {
  color: var(--text-main);
  font-size: 1.05rem;
  font-weight: 600;
  position: relative;
  padding: 6px 0;
}

.nav-links a:hover, .nav-links a.active {
  color: var(--primary);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 3px;
  background: linear-gradient(90deg, #7c3aed, #ec4899);
  border-radius: 2px;
  transition: var(--transition);
}

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

.nav-cta {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 26px;
  border-radius: var(--radius-full);
  font-family: var(--font-family);
  font-size: 1.05rem;
  font-weight: 700;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  outline: none;
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, #7c3aed 0%, #6d28d9 100%);
  color: #ffffff;
  box-shadow: var(--shadow-purple);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 36px rgba(124, 58, 237, 0.35);
  color: #ffffff;
}

.btn-secondary {
  background: #ffffff;
  color: var(--text-main);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  background: var(--primary-light);
  color: var(--primary);
  border-color: rgba(124, 58, 237, 0.3);
  transform: translateY(-2px);
}

.btn-gradient {
  background: linear-gradient(135deg, #7c3aed 0%, #ec4899 100%);
  color: #ffffff;
  box-shadow: 0 8px 24px rgba(236, 72, 153, 0.3);
}

.btn-gradient:hover {
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 12px 30px rgba(236, 72, 153, 0.45);
  color: #fff;
}

.btn-lg {
  padding: 16px 36px;
  font-size: 1.2rem;
}

/* Mobile Menu Toggle */
.mobile-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.6rem;
  color: var(--text-main);
  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: 8px 20px;
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid rgba(124, 58, 237, 0.2);
  box-shadow: 0 4px 20px rgba(124, 58, 237, 0.12);
  border-radius: var(--radius-full);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 24px;
  backdrop-filter: blur(8px);
}

.hero-title {
  font-size: 3.2rem;
  line-height: 1.25;
  margin-bottom: 24px;
  max-width: 960px;
  margin-left: auto;
  margin-right: auto;
  letter-spacing: -1px;
}

.hero-subtitle {
  font-size: 1.3rem;
  color: var(--text-muted);
  max-width: 820px;
  margin: 0 auto 36px;
  line-height: 1.8;
}

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

/* Quick Features Pill Bar */
.features-pills {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  max-width: 1000px;
  margin: 0 auto 40px;
}

.pill-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  background: rgba(255, 255, 255, 0.85);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-main);
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(6px);
  transition: var(--transition);
}

.pill-item:hover {
  transform: translateY(-2px);
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
}

.pill-icon {
  font-size: 1.2rem;
}

/* Stats Counter Banner */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: var(--glass-backdrop);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-md);
  margin-top: 20px;
}

.stat-card {
  text-align: center;
}

.stat-num {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--primary);
  line-height: 1.1;
  margin-bottom: 6px;
}

.stat-label {
  font-size: 1.05rem;
  color: var(--text-muted);
  font-weight: 600;
}

/* Features Section (核心优势) */
.section {
  padding: 80px 0;
  position: relative;
}

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

.adv-card {
  background: var(--bg-card);
  backdrop-filter: var(--glass-backdrop);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 32px 24px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.adv-card:hover {
  transform: translateY(-6px);
  background: var(--bg-card-hover);
  border-color: rgba(124, 58, 237, 0.3);
  box-shadow: var(--shadow-lg);
}

.adv-icon {
  width: 56px;
  height: 56px;
  border-radius: 16px;
  background: var(--primary-light);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  margin-bottom: 20px;
}

.adv-title {
  font-size: 1.3rem;
  margin-bottom: 12px;
}

.adv-desc {
  font-size: 1.02rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* Pricing Section - EXACTLY MATCHING USER'S SUBMITTED IMAGE */
.pricing-section {
  background: linear-gradient(180deg, rgba(243, 232, 255, 0.3) 0%, rgba(248, 250, 252, 0.5) 100%);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  align-items: stretch;
}

.pricing-card {
  background: #ffffff;
  border: 1px solid #e2e8f0;
  border-radius: 24px;
  padding: 40px 32px;
  display: flex;
  flex-direction: column;
  position: relative;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.04);
  transition: var(--transition);
}

.pricing-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 20px 40px rgba(124, 58, 237, 0.12);
}

/* Hot Featured Card Style (Matching Image middle card) */
.pricing-card.featured {
  border: 2px solid #a855f7;
  box-shadow: 0 16px 40px rgba(168, 85, 247, 0.22);
  transform: scale(1.03);
}

.pricing-card.featured:hover {
  transform: scale(1.05) translateY(-4px);
}

.top-badge {
  position: absolute;
  top: -16px;
  right: 28px;
  background: linear-gradient(135deg, #7c3aed, #a855f7);
  color: #fff;
  padding: 6px 18px;
  border-radius: var(--radius-full);
  font-size: 0.95rem;
  font-weight: 700;
  box-shadow: 0 4px 14px rgba(124, 58, 237, 0.35);
}

.pill-badge {
  display: inline-block;
  align-self: flex-start;
  padding: 4px 14px;
  background: #f3e8ff;
  color: #7c3aed;
  border-radius: var(--radius-full);
  font-size: 0.9rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.plan-name {
  font-size: 1.8rem;
  font-weight: 800;
  color: #0f172a;
  margin-bottom: 20px;
}

.plan-price-box {
  margin-bottom: 12px;
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.price-symbol {
  font-size: 1.8rem;
  font-weight: 800;
  color: #7c3aed;
}

.price-num {
  font-size: 3.2rem;
  font-weight: 900;
  color: #7c3aed;
  line-height: 1;
}

.price-period {
  font-size: 1.15rem;
  color: #64748b;
  font-weight: 700;
}

.plan-subtext {
  font-size: 0.98rem;
  color: #7c3aed;
  font-weight: 700;
  margin-bottom: 24px;
}

.plan-features {
  list-style: none;
  margin-bottom: 36px;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.plan-features li {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.1rem;
  color: #334155;
  font-weight: 600;
}

.plan-features .check-icon {
  width: 22px;
  height: 22px;
  background: #7c3aed;
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  flex-shrink: 0;
}

.btn-card {
  width: 100%;
  padding: 14px 20px;
  border-radius: 16px;
  font-size: 1.15rem;
  font-weight: 800;
  text-align: center;
  background: #f8fafc;
  color: #334155;
  border: 1px solid #e2e8f0;
  transition: var(--transition);
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
}

.btn-card:hover {
  background: #f1f5f9;
  color: #0f172a;
}

.pricing-card.featured .btn-card {
  background: linear-gradient(135deg, #7c3aed, #6d28d9);
  color: #ffffff;
  border: none;
  box-shadow: 0 8px 24px rgba(124, 58, 237, 0.35);
}

.pricing-card.featured .btn-card:hover {
  background: linear-gradient(135deg, #6d28d9, #5b21b6);
  transform: translateY(-2px);
}

/* Node List Section (节点列表) */
.node-filter {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 32px;
  flex-wrap: wrap;
}

.filter-btn {
  padding: 8px 20px;
  border-radius: var(--radius-full);
  background: #ffffff;
  border: 1px solid var(--border-light);
  color: var(--text-muted);
  font-family: var(--font-family);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.filter-btn.active, .filter-btn:hover {
  background: var(--primary);
  color: #ffffff;
  border-color: var(--primary);
  box-shadow: 0 4px 12px rgba(124, 58, 237, 0.2);
}

.nodes-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.node-card {
  background: var(--bg-card);
  backdrop-filter: var(--glass-backdrop);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: var(--transition);
}

.node-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.node-info {
  display: flex;
  align-items: center;
  gap: 14px;
}

.node-flag {
  font-size: 1.8rem;
}

.node-name {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-main);
}

.node-tags {
  display: flex;
  gap: 6px;
  margin-top: 4px;
}

.node-tag {
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: 4px;
  background: var(--primary-light);
  color: var(--primary);
  font-weight: 700;
}

.node-ping {
  text-align: right;
}

.ping-value {
  font-size: 1rem;
  font-weight: 800;
  color: var(--success);
  display: flex;
  align-items: center;
  gap: 4px;
}

.ping-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--success);
  display: inline-block;
  box-shadow: 0 0 8px var(--success);
}

.node-speed {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Tutorials Section (使用教程) */
.tutorial-tabs {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 36px;
  flex-wrap: wrap;
}

.tab-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius-md);
  background: #ffffff;
  border: 1px solid var(--border-light);
  font-family: var(--font-family);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
  cursor: pointer;
  transition: var(--transition);
}

.tab-btn.active {
  background: linear-gradient(135deg, #7c3aed, #6d28d9);
  color: #ffffff;
  border-color: var(--primary);
  box-shadow: var(--shadow-purple);
}

.tutorial-content {
  background: #ffffff;
  border-radius: var(--radius-lg);
  padding: 40px;
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-md);
}

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

.step-card {
  background: #f8fafc;
  border-radius: var(--radius-md);
  padding: 28px;
  border: 1px solid var(--border-light);
  position: relative;
}

.step-num {
  position: absolute;
  top: -16px;
  left: 24px;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: linear-gradient(135deg, #7c3aed, #ec4899);
  color: #fff;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
}

.step-title {
  font-size: 1.25rem;
  margin: 12px 0 10px;
}

.step-desc {
  font-size: 1rem;
  color: var(--text-muted);
}

/* Download Center (下载中心) */
.download-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.dl-card {
  background: #ffffff;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  padding: 28px 20px;
  text-align: center;
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
}

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

.dl-icon {
  font-size: 3rem;
  margin-bottom: 16px;
}

.dl-name {
  font-size: 1.3rem;
  margin-bottom: 6px;
}

.dl-os {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-bottom: 20px;
}

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

.faq-item {
  background: #ffffff;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition);
}

.faq-header {
  padding: 20px 24px;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-main);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.faq-header::after {
  content: '+';
  font-size: 1.5rem;
  color: var(--primary);
  transition: var(--transition);
}

.faq-item.active .faq-header::after {
  content: '−';
}

.faq-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s cubic-bezier(0, 1, 0, 1);
  padding: 0 24px;
  background: #f8fafc;
}

.faq-item.active .faq-body {
  max-height: 1000px;
  padding: 16px 24px 24px;
  border-top: 1px solid var(--border-light);
}

/* User Reviews Section */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.review-card {
  background: #ffffff;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.review-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: rgba(124, 58, 237, 0.3);
}

.review-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 16px;
}

.avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, #7c3aed, #ec4899);
  color: #fff;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
}

.user-name {
  font-size: 1.1rem;
  font-weight: 700;
}

.stars {
  color: #f59e0b;
  font-size: 0.9rem;
}

.review-text {
  font-size: 1.02rem;
  color: var(--text-muted);
  line-height: 1.7;
}

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

.article-card {
  background: #ffffff;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 28px;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: var(--shadow-sm);
}

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

.article-category {
  display: inline-block;
  padding: 4px 12px;
  background: var(--primary-light);
  color: var(--primary);
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 700;
  margin-bottom: 14px;
  align-self: flex-start;
}

.article-title {
  font-size: 1.25rem;
  line-height: 1.4;
  margin-bottom: 12px;
}

.article-title a {
  color: var(--text-main);
}

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

.article-excerpt {
  font-size: 0.98rem;
  color: var(--text-muted);
  margin-bottom: 20px;
  line-height: 1.6;
}

.article-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.88rem;
  color: var(--text-light);
  border-top: 1px dashed var(--border-light);
  padding-top: 14px;
}

.read-more {
  color: var(--primary);
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 4px;
}

/* 85 Keywords Tag Cloud Section */
.tags-section {
  background: #ffffff;
  border-top: 1px solid var(--border-light);
  border-bottom: 1px solid var(--border-light);
  padding: 60px 0;
}

.tags-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
  max-width: 1140px;
  margin: 0 auto;
}

.tag-item {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 6px 14px;
  background: #f1f5f9;
  color: #475569;
  border-radius: var(--radius-full);
  font-size: 0.92rem;
  font-weight: 600;
  transition: var(--transition);
  text-decoration: none;
  border: 1px solid #e2e8f0;
}

.tag-item:hover {
  background: var(--primary);
  color: #ffffff;
  border-color: var(--primary);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(124, 58, 237, 0.25);
}

/* Footer */
.footer {
  background: #0f172a;
  color: #94a3b8;
  padding: 70px 0 30px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: 40px;
  margin-bottom: 50px;
}

.footer-brand {
  font-size: 1.6rem;
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.footer-desc {
  font-size: 1rem;
  line-height: 1.8;
  margin-bottom: 24px;
  color: #94a3b8;
}

.footer-heading {
  font-size: 1.15rem;
  color: #ffffff;
  margin-bottom: 20px;
}

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

.footer-links a {
  color: #94a3b8;
  font-size: 0.98rem;
  transition: var(--transition);
}

.footer-links a:hover {
  color: #a855f7;
  padding-left: 4px;
}

.footer-bottom {
  border-top: 1px solid #1e293b;
  padding-top: 30px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.9rem;
}

/* Article Detail Page Layout & Typography */
.article-container {
  max-width: 900px;
  margin: 40px auto 80px;
  background: #ffffff;
  padding: 48px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border-light);
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.article-header-meta {
  margin-bottom: 32px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-light);
}

.article-page-title {
  font-size: 2.4rem;
  line-height: 1.3;
  margin-bottom: 16px;
  color: #0f172a;
}

.article-body {
  font-size: 1.1rem;
  line-height: 1.9;
  color: #334155;
}

.article-body h2 {
  font-size: 1.6rem;
  margin: 40px 0 20px;
  padding-left: 14px;
  border-left: 4px solid var(--primary);
  color: #0f172a;
}

.article-body h3 {
  font-size: 1.35rem;
  margin: 28px 0 14px;
  color: #1e293b;
}

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

.article-body ul, .article-body ol {
  margin: 0 0 24px 24px;
}

.article-body li {
  margin-bottom: 10px;
}

.article-callout {
  background: var(--primary-light);
  border: 1px solid rgba(124, 58, 237, 0.3);
  border-radius: var(--radius-md);
  padding: 24px;
  margin: 32px 0;
}

.article-callout h4 {
  color: var(--primary);
  font-size: 1.2rem;
  margin-bottom: 8px;
}

/* Responsive Breakpoints */
@media (max-width: 1024px) {
  .advantages-grid, .download-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-grid, .nodes-grid, .articles-grid, .reviews-grid, .step-list {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-card.featured {
    transform: none;
  }
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .hero-title {
    font-size: 2.6rem;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  .mobile-toggle {
    display: block;
  }
  .hero-title {
    font-size: 2.1rem;
  }
  .pricing-grid, .nodes-grid, .articles-grid, .reviews-grid, .step-list, .advantages-grid, .download-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .article-container {
    padding: 24px;
  }
  .stats-grid {
    grid-template-columns: 1fr 1fr;
  }
}