/* ==========================================================================
   快连vpn - Premium SaaS & Accelerator Landing Page Stylesheet
   Pastel Blue & Grey Theme | Cute Dog Pattern Background Overlay
   Pure Native CSS | Responsive | Bento Grid | Mobile First | Minimal & Light
   ========================================================================== */

/* 1. Design System & CSS Variables - Pastel Blue & Grey Palette */
:root {
  --bg-dark: #0F172A;            /* Deep slate blue-grey */
  --bg-surface: #1E293B;         /* Soft pastel slate container */
  --bg-card: rgba(30, 41, 59, 0.78);
  --bg-card-hover: rgba(51, 65, 85, 0.88);
  --border-color: rgba(147, 197, 253, 0.15);
  --border-color-glow: rgba(147, 197, 253, 0.45);
  
  --primary-cyan: #93C5FD;        /* Soft Pastel Sky Blue */
  --primary-blue: #60A5FA;        /* Vibrant Pastel Blue */
  --primary-purple: #A5B4FC;      /* Pastel Soft Indigo/Slate */
  
  --text-main: #F8FAFC;          /* Soft Crisp White */
  --text-sub: #E2E8F0;           /* Pastel Grey */
  --text-muted: #94A3B8;         /* Muted Slate Grey */
  
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  
  --shadow-glow: 0 0 30px rgba(147, 197, 253, 0.2);
  --shadow-card: 0 10px 30px -10px rgba(15, 23, 42, 0.6);
  
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
}

/* 2. Global Resets & Base Styles */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

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

/* Radial Glow Gradient Top Background */
body::before {
  content: "";
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100vw;
  height: 800px;
  background: radial-gradient(circle at 50% 10%, rgba(147, 197, 253, 0.18) 0%, rgba(96, 165, 250, 0.08) 50%, transparent 80%);
  pointer-events: none;
  z-index: -1;
}

/* Dog Pattern Overlay Background (Cute Paw Prints, Dog Faces & Bones) */
body::after {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="160" height="160" viewBox="0 0 160 160" fill="none" stroke="%2393C5FD" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round"><g opacity="0.35"><path d="M35 45 C35 25, 15 25, 20 45 C10 50, 15 70, 35 70 C55 70, 60 50, 50 45 C55 25, 35 25, 35 45 Z"/><ellipse cx="35" cy="55" rx="6" ry="4.5"/><circle cx="35" cy="53" r="1.8" fill="%2393C5FD"/><circle cx="28" cy="44" r="2" fill="%2393C5FD"/><circle cx="42" cy="44" r="2" fill="%2393C5FD"/><path d="M20 40 C10 25, 2 45, 14 52"/><path d="M50 40 C60 25, 68 45, 56 52"/><path d="M115 45 C110 45 105 50 108 56 C111 62 124 62 127 56 C130 50 125 45 120 45 Z"/><circle cx="106" cy="38" r="3" fill="%2393C5FD"/><circle cx="114" cy="33" r="3" fill="%2393C5FD"/><circle cx="123" cy="34" r="3" fill="%2393C5FD"/><circle cx="130" cy="40" r="3" fill="%2393C5FD"/><path d="M30 120 C25 115 18 120 22 125 C18 130 25 135 30 130 L65 130 C70 135 77 130 73 125 C77 120 70 115 65 120 Z"/><path d="M125 125 C120 125 115 130 118 136 C121 142 134 142 137 136 C140 130 135 125 130 125 Z"/><circle cx="116" cy="118" r="3" fill="%2393C5FD"/><circle cx="124" cy="113" r="3" fill="%2393C5FD"/><circle cx="133" cy="114" r="3" fill="%2393C5FD"/><circle cx="140" cy="120" r="3" fill="%2393C5FD"/></g></svg>');
  background-repeat: repeat;
  background-size: 160px 160px;
  opacity: 0.12;
  pointer-events: none;
  z-index: -1;
}

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

ul, ol {
  list-style: none;
}

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

/* Container */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* Section Header Shared Component */
.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 3.5rem;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.9rem;
  border-radius: var(--radius-full);
  background: rgba(147, 197, 253, 0.1);
  border: 1px solid rgba(147, 197, 253, 0.25);
  color: var(--primary-cyan);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 800;
  line-height: 1.25;
  color: var(--text-main);
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}

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

/* Pastel Blue & Slate Gradient Text Effect */
.gradient-text {
  background: linear-gradient(135deg, #BFDBFE 0%, #93C5FD 50%, #60A5FA 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Button Component */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 0.85rem 1.75rem;
  font-size: 0.98rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: all var(--transition-normal);
  cursor: pointer;
  border: none;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-blue), var(--primary-cyan));
  color: #0F172A;
  font-weight: 700;
  box-shadow: 0 4px 20px rgba(147, 197, 253, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(147, 197, 253, 0.5);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-main);
  border: 1px solid var(--border-color);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(147, 197, 253, 0.3);
  transform: translateY(-2px);
}

/* 3. Header & Navigation */
.site-header {
  position: sticky;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  background: rgba(15, 23, 42, 0.88);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  transition: all var(--transition-normal);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4.5rem;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: -0.02em;
}

.brand-icon {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, var(--primary-blue), var(--primary-cyan));
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #0F172A;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 1.8rem;
}

.nav-link {
  font-size: 0.92rem;
  color: var(--text-muted);
  font-weight: 500;
  transition: color var(--transition-fast);
}

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

.header-cta {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.mobile-toggle {
  display: none;
  background: transparent;
  border: none;
  color: var(--text-main);
  cursor: pointer;
  padding: 0.5rem;
}

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

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 3.5rem;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 1rem;
  border-radius: var(--radius-full);
  background: rgba(147, 197, 253, 0.08);
  border: 1px solid rgba(147, 197, 253, 0.2);
  color: var(--primary-cyan);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
}

.hero-badge .pulse-dot {
  width: 8px;
  height: 8px;
  background-color: var(--primary-cyan);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--primary-cyan);
  animation: pulse-ring 2s infinite;
}

.hero-title {
  font-size: 3.25rem;
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 1.25rem;
}

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

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

.hero-features-list {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
  font-size: 0.88rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border-color);
  padding-top: 1.5rem;
}

.hero-feature-item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.hero-feature-item svg {
  color: var(--primary-cyan);
}

/* Hero Network Dashboard (Right Visual) */
.dashboard-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow-card);
  position: relative;
  overflow: hidden;
}

.dashboard-card::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 200px;
  height: 200px;
  background: radial-gradient(circle, rgba(147, 197, 253, 0.15) 0%, transparent 70%);
  pointer-events: none;
}

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

.dashboard-title-group {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
  background: rgba(52, 211, 153, 0.12);
  border: 1px solid rgba(52, 211, 153, 0.35);
  color: #34D399;
  font-size: 0.75rem;
  font-weight: 600;
}

.status-pill-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: #34D399;
  box-shadow: 0 0 6px #34D399;
}

/* World Nodes Grid */
.nodes-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.node-item {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: all var(--transition-fast);
}

.node-item:hover {
  background: rgba(255, 255, 255, 0.06);
  border-color: var(--border-color-glow);
}

.node-info {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.node-flag {
  font-size: 1.25rem;
}

.node-name {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-main);
}

.node-type {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.node-ping {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--primary-cyan);
  background: rgba(147, 197, 253, 0.12);
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
}

/* Animated Network Chart Canvas Visual */
.network-wave-box {
  background: rgba(0, 0, 0, 0.25);
  border-radius: var(--radius-md);
  padding: 1rem;
  border: 1px solid var(--border-color);
}

.network-wave-info {
  display: flex;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.network-svg-chart {
  width: 100%;
  height: 60px;
}

.wave-line {
  fill: none;
  stroke: url(#wave-gradient);
  stroke-width: 2.5;
  stroke-linecap: round;
  stroke-dasharray: 600;
  stroke-dashoffset: 0;
  animation: wave-anim 6s linear infinite;
}

/* 5. Core Advantages (Bento Grid) */
.advantages-section {
  padding: 5rem 0;
}

.bento-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.bento-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2rem;
  position: relative;
  overflow: hidden;
  transition: all var(--transition-normal);
  backdrop-filter: blur(12px);
}

.bento-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-color-glow);
  box-shadow: var(--shadow-glow);
}

.card-icon-box {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: rgba(147, 197, 253, 0.1);
  border: 1px solid rgba(147, 197, 253, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary-cyan);
  margin-bottom: 1.5rem;
}

.bento-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.75rem;
}

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

/* 6. Global Network Capacity Section */
.network-section {
  padding: 5rem 0;
  background: radial-gradient(ellipse at center, rgba(30, 58, 138, 0.2) 0%, transparent 70%);
}

.nodes-feature-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
}

.feature-mini-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  text-align: center;
  transition: border-color var(--transition-fast);
}

.feature-mini-card:hover {
  border-color: rgba(147, 197, 253, 0.3);
}

.feature-mini-card .metric {
  font-size: 2rem;
  font-weight: 800;
  color: var(--primary-cyan);
  margin-bottom: 0.25rem;
}

.feature-mini-card .label {
  font-size: 0.88rem;
  color: var(--text-muted);
}

/* 7. AI & Streaming Section */
.ai-streaming-section {
  padding: 5rem 0;
}

.scenarios-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
}

.scenario-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2.25rem;
  backdrop-filter: blur(12px);
}

.scenario-card-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.scenario-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, rgba(147, 197, 253, 0.2), rgba(165, 180, 252, 0.2));
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary-cyan);
}

.tags-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1.5rem;
}

.tag-pill {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  color: var(--text-sub);
  padding: 0.4rem 0.85rem;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

/* 8. SaaS Pricing Section */
.pricing-section {
  padding: 5rem 0;
  position: relative;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2rem 1.5rem;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all var(--transition-normal);
}

.pricing-card.recommended {
  background: linear-gradient(180deg, rgba(30, 41, 59, 0.95) 0%, rgba(51, 65, 85, 0.95) 100%);
  border: 2px solid var(--primary-cyan);
  box-shadow: 0 0 30px rgba(147, 197, 253, 0.25);
  transform: translateY(-8px);
}

.recommended-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, var(--primary-blue), var(--primary-cyan));
  color: #0F172A;
  padding: 0.25rem 1rem;
  border-radius: var(--radius-full);
  font-size: 0.78rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.pricing-plan-name {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.5rem;
}

.pricing-price-box {
  margin: 1rem 0 1.5rem;
}

.pricing-price {
  font-size: 2.25rem;
  font-weight: 900;
  color: var(--text-main);
}

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

.pricing-features {
  margin-bottom: 2rem;
  flex-grow: 1;
}

.pricing-feature-item {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.88rem;
  color: var(--text-sub);
  margin-bottom: 0.75rem;
}

.pricing-feature-item svg {
  color: var(--primary-cyan);
  flex-shrink: 0;
}

.pricing-btn {
  width: 100%;
}

/* 9. SEO Articles Section (3x3 Grid) */
.seo-articles-section {
  padding: 5rem 0;
}

.blog-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
}

.blog-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  transition: all var(--transition-normal);
  backdrop-filter: blur(12px);
}

.blog-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-color-glow);
}

.blog-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 0.85rem;
}

.blog-category {
  color: var(--primary-cyan);
  font-weight: 600;
  background: rgba(147, 197, 253, 0.1);
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-sm);
}

.blog-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.4;
  margin-bottom: 0.75rem;
}

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

.blog-excerpt {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

.blog-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--primary-cyan);
}

.blog-link:hover {
  gap: 0.6rem;
}

/* 10. Testimonials Section */
.testimonials-section {
  padding: 5rem 0;
}

.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.testimonial-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  backdrop-filter: blur(12px);
}

.user-profile {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  margin-bottom: 1rem;
}

.avatar-placeholder {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary-blue), var(--primary-purple));
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: #0F172A;
}

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

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

.testimonial-text {
  font-size: 0.92rem;
  color: var(--text-sub);
  line-height: 1.6;
}

/* 11. FAQ Accordion Section */
.faq-section {
  padding: 5rem 0;
}

.faq-list {
  max-width: 860px;
  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;
  transition: border-color var(--transition-fast);
}

.faq-item.active {
  border-color: var(--border-color-glow);
}

.faq-question {
  width: 100%;
  padding: 1.25rem 1.5rem;
  background: transparent;
  border: none;
  color: var(--text-main);
  font-size: 1.05rem;
  font-weight: 600;
  text-align: left;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
}

.faq-icon {
  width: 20px;
  height: 20px;
  transition: transform var(--transition-normal);
  color: var(--primary-cyan);
  flex-shrink: 0;
}

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

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

.faq-item.active .faq-answer {
  max-height: 300px;
  padding: 0 1.5rem 1.25rem;
}

/* 12. Article / Sub-page Layout Styles */
.page-hero {
  padding: 4rem 0 2rem;
  text-align: center;
}

.breadcrumb {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

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

.article-container {
  max-width: 860px;
  margin: 0 auto;
  padding: 2rem 1.25rem 5rem;
}

.article-content {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 3rem 2.5rem;
  backdrop-filter: blur(12px);
  color: var(--text-sub);
  line-height: 1.8;
  font-size: 1.05rem;
}

.article-content h1 {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 1.5rem;
  line-height: 1.3;
}

.article-content h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-main);
  margin: 2.5rem 0 1.2rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-color);
}

.article-content h3 {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-main);
  margin: 1.75rem 0 0.85rem;
}

.article-content p {
  margin-bottom: 1.25rem;
}

.article-content ul, .article-content ol {
  margin-bottom: 1.5rem;
  padding-left: 1.5rem;
}

.article-content ul li {
  list-style-type: disc;
  margin-bottom: 0.5rem;
}

.article-content ol li {
  list-style-type: decimal;
  margin-bottom: 0.5rem;
}

.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.75rem 0;
  font-size: 0.95rem;
}

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

.article-content th {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-main);
  font-weight: 700;
}

.article-content blockquote {
  border-left: 4px solid var(--primary-cyan);
  background: rgba(147, 197, 253, 0.08);
  padding: 1rem 1.25rem;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin: 1.5rem 0;
  font-style: italic;
  color: var(--text-sub);
}

.article-cta-box {
  background: linear-gradient(135deg, rgba(147, 197, 253, 0.12), rgba(165, 180, 252, 0.12));
  border: 1px solid var(--border-color-glow);
  border-radius: var(--radius-lg);
  padding: 2rem;
  text-align: center;
  margin: 3rem 0 2rem;
}

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

/* 13. Site Footer */
.site-footer {
  background: #0B1120;
  border-top: 1px solid var(--border-color);
  padding: 4rem 0 2.5rem;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.footer-top {
  display: grid;
  grid-template-columns: 1.5fr repeat(3, 1fr);
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-brand p {
  margin-top: 0.85rem;
  line-height: 1.6;
  max-width: 320px;
}

.footer-col h4 {
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 1.2rem;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

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

.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;
}

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

.recommended-sites-label {
  font-weight: 600;
  color: var(--text-main);
}

.recommended-site-link {
  color: var(--text-muted);
  transition: color var(--transition-fast);
}

.recommended-site-link:hover {
  color: var(--primary-cyan);
}

/* 14. Keyframe Animations */
@keyframes pulse-ring {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(147, 197, 253, 0.7); }
  70% { transform: scale(1.1); box-shadow: 0 0 0 8px rgba(147, 197, 253, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(147, 197, 253, 0); }
}

@keyframes wave-anim {
  0% { stroke-dashoffset: 600; }
  100% { stroke-dashoffset: 0; }
}

/* Reduced Motion Optimization */
@media (prefers-reduced-motion: reduce) {
  *, ::before, ::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* 15. Responsive Breakpoints */

/* Laptop & Tablet Large (1024px) */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .bento-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .blog-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .nodes-feature-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-top {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Tablet (768px) */
@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: 4.5rem;
    left: 0;
    width: 100%;
    background: rgba(15, 23, 42, 0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 2rem 1.5rem;
    gap: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    transform: translateY(-150%);
    transition: transform var(--transition-normal);
    z-index: 99;
  }
  
  .nav-menu.active {
    transform: translateY(0);
  }
  
  .mobile-toggle {
    display: block;
  }
  
  .header-cta .btn {
    display: none;
  }
  
  .hero-title {
    font-size: 2.25rem;
  }
  
  .scenarios-grid {
    grid-template-columns: 1fr;
  }
  
  .testimonials-grid {
    grid-template-columns: 1fr;
  }
  
  .bento-grid {
    grid-template-columns: 1fr;
  }
  
  .pricing-grid {
    grid-template-columns: 1fr;
  }
  .pricing-card.recommended {
    transform: none;
  }
  
  .blog-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* Mobile Small (430px, 390px, 375px) */
@media (max-width: 480px) {
  .hero-title {
    font-size: 1.85rem;
  }
  .nodes-grid {
    grid-template-columns: 1fr;
  }
  .nodes-feature-grid {
    grid-template-columns: 1fr;
  }
  .footer-top {
    grid-template-columns: 1fr;
  }
  .article-content {
    padding: 1.5rem 1rem;
  }
}