/* ==========================================================================
   MESL (mesl.best) - Enterprise Brand Landing Page Stylesheet V3.0
   Design System: Modern SaaS Tech Style
   Color Palette:
     - Primary:   #6366F1 (Indigo)
     - Secondary: #3B82F6 (Blue)
     - Accent:    #8B5CF6 (Violet)
     - Background:#080D1C (Deep Tech Obsidian)
     - Surface:   #111827 (Surface / Dark Slate)
     - Text:      #F8FAFC (Crisp White / Slate 50)
   ========================================================================== */

:root {
  /* Brand Core Colors */
  --primary: #6366F1;
  --secondary: #3B82F6;
  --accent: #8B5CF6;
  --bg-dark: #080D1C;
  --surface: #111827;
  --surface-hover: #1b2436;
  --surface-glass: rgba(17, 24, 39, 0.72);
  --surface-glass-active: rgba(27, 36, 54, 0.85);

  /* Typography Colors */
  --text-main: #F8FAFC;
  --text-muted: #94A3B8;
  --text-dim: #64748B;

  /* Functional Status Colors */
  --status-emerald: #10B981;
  --status-amber: #F59E0B;
  --status-rose: #F43F5E;

  /* Blue-Violet SaaS Gradients */
  --gradient-brand: linear-gradient(135deg, #3B82F6 0%, #6366F1 50%, #8B5CF6 100%);
  --gradient-brand-hover: linear-gradient(135deg, #60A5FA 0%, #818CF8 50%, #A78BFA 100%);
  --gradient-btn: linear-gradient(135deg, #3B82F6 0%, #6366F1 60%, #8B5CF6 100%);
  --gradient-surface: linear-gradient(180deg, rgba(27, 36, 54, 0.6) 0%, rgba(17, 24, 39, 0.9) 100%);
  --gradient-glow: radial-gradient(circle, rgba(99, 102, 241, 0.18) 0%, rgba(8, 13, 28, 0) 70%);

  /* Refined Borders */
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-card: rgba(255, 255, 255, 0.06);
  --border-focus: rgba(99, 102, 241, 0.45);
  --border-accent: rgba(139, 92, 246, 0.4);
  --border-hover: rgba(99, 102, 241, 0.35);

  /* Soft Ambient Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-card: 0 10px 30px -8px rgba(0, 0, 0, 0.55);
  --shadow-card-hover: 0 16px 36px -10px rgba(0, 0, 0, 0.65), 0 0 25px -5px rgba(99, 102, 241, 0.25);
  --shadow-btn: 0 4px 18px rgba(99, 102, 241, 0.38);

  /* Border Radii */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Typography Stacks */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  /* Restrained Transitions */
  --transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-fast: all 0.15s ease;
}

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

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

body {
  background-color: var(--bg-dark);
  color: var(--text-main);
  font-family: var(--font-sans);
  line-height: 1.65;
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Subtle SaaS Background Ambience */
.ambient-glow-top {
  position: absolute;
  top: -160px;
  left: 50%;
  transform: translateX(-50%);
  width: 980px;
  height: 520px;
  background: radial-gradient(ellipse at center, rgba(99, 102, 241, 0.18) 0%, rgba(59, 130, 246, 0.08) 40%, rgba(8, 13, 28, 0) 75%);
  filter: blur(80px);
  pointer-events: none;
  z-index: 0;
}

.ambient-glow-mid {
  position: absolute;
  top: 2400px;
  left: 5%;
  width: 800px;
  height: 500px;
  background: radial-gradient(ellipse at center, rgba(139, 92, 246, 0.12) 0%, rgba(8, 13, 28, 0) 70%);
  filter: blur(90px);
  pointer-events: none;
  z-index: 0;
}

.ambient-glow-pricing {
  position: absolute;
  top: 5000px;
  right: 5%;
  width: 900px;
  height: 520px;
  background: radial-gradient(ellipse at center, rgba(59, 130, 246, 0.12) 0%, rgba(99, 102, 241, 0.08) 45%, rgba(8, 13, 28, 0) 75%);
  filter: blur(90px);
  pointer-events: none;
  z-index: 0;
}

.container {
  width: 100%;
  max-width: 1220px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

/* ==========================================================================
   Unified Typography Hierarchy
   ========================================================================== */
h1, h2, h3, h4, h5, h6 {
  color: var(--text-main);
  letter-spacing: -0.025em;
  font-weight: 800;
}

.text-gradient {
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Section Headings */
.section {
  padding: 85px 0;
  position: relative;
}

.section-head {
  text-align: center;
  max-width: 780px;
  margin: 0 auto 52px;
}

.section-eyebrow {
  display: inline-block;
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--secondary);
  background: rgba(59, 130, 246, 0.1);
  border: 1px solid rgba(59, 130, 246, 0.22);
  padding: 3px 12px;
  border-radius: var(--radius-full);
  margin-bottom: 14px;
}

.section-title {
  font-size: clamp(1.85rem, 3.2vw, 2.4rem);
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 16px;
}

.section-sub {
  font-size: 1.05rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* ==========================================================================
   Unified Buttons
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 0.92rem;
  font-weight: 600;
  padding: 10px 20px;
  border-radius: var(--radius-md);
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition);
  border: 1px solid transparent;
  white-space: nowrap;
}

.btn-primary {
  background: var(--gradient-btn);
  color: #ffffff;
  box-shadow: var(--shadow-btn);
}

.btn-primary:hover {
  background: var(--gradient-brand-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(99, 102, 241, 0.5);
  color: #ffffff;
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-main);
  border-color: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(8px);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.09);
  border-color: rgba(99, 102, 241, 0.35);
  color: #ffffff;
  transform: translateY(-2px);
}

.btn-lg {
  padding: 13px 26px;
  font-size: 1.02rem;
  border-radius: var(--radius-md);
}

.btn-sm {
  padding: 7px 15px;
  font-size: 0.85rem;
  border-radius: var(--radius-sm);
}

.btn-block {
  width: 100%;
}

.btn-pulse {
  position: relative;
  overflow: hidden;
}

.btn-pulse::after {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: linear-gradient(
    60deg,
    rgba(255, 255, 255, 0) 20%,
    rgba(255, 255, 255, 0.15) 50%,
    rgba(255, 255, 255, 0) 80%
  );
  transform: rotate(30deg) translateX(-100%);
  animation: shine 4.5s infinite ease-in-out;
}

@keyframes shine {
  0% { transform: rotate(30deg) translateX(-150%); }
  35% { transform: rotate(30deg) translateX(150%); }
  100% { transform: rotate(30deg) translateX(150%); }
}

/* ==========================================================================
   01 | 顶部导航 Header
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(8, 13, 28, 0.82);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  transition: var(--transition);
}

.site-header.scrolled {
  background: rgba(8, 13, 28, 0.96);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.45);
  border-bottom-color: rgba(255, 255, 255, 0.1);
}

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

.brand-logo-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: var(--text-main);
  transition: var(--transition);
}

.brand-logo-img {
  height: 38px;
  width: auto;
  max-width: 145px;
  display: block;
  object-fit: contain;
  transition: var(--transition);
}

.brand-logo-wrap:hover .brand-logo-img {
  transform: translateY(-1px) scale(1.02);
  filter: drop-shadow(0 0 14px rgba(99, 102, 241, 0.45));
}

.brand-subdomain {
  font-size: 0.75rem;
  color: var(--secondary);
  background: rgba(59, 130, 246, 0.12);
  border: 1px solid rgba(59, 130, 246, 0.25);
  padding: 2px 7px;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-weight: 700;
  letter-spacing: 0.04em;
  margin-left: 2px;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 24px;
  list-style: none;
}

.nav-link {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 500;
  transition: var(--transition);
  position: relative;
  padding: 6px 0;
}

.nav-link:hover {
  color: var(--text-main);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background: var(--gradient-brand);
  transition: width 0.25s ease;
  border-radius: 2px;
}

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

.header-action-wrap {
  display: flex;
  align-items: center;
  gap: 16px;
}

.mobile-toggle {
  display: none;
  background: transparent;
  border: none;
  color: var(--text-main);
  cursor: pointer;
  padding: 8px;
  font-size: 1.5rem;
}

/* ==========================================================================
   02 | Hero 首屏
   ========================================================================== */
.hero-section {
  padding: 75px 0 50px;
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 48px;
  align-items: center;
}

.hero-badge-wrap {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  background: rgba(17, 24, 39, 0.85);
  border: 1px solid rgba(99, 102, 241, 0.3);
  font-size: 0.85rem;
  color: var(--secondary);
  margin-bottom: 24px;
}

.pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--status-emerald);
  box-shadow: 0 0 10px var(--status-emerald);
}

.hero-title {
  font-size: clamp(2.4rem, 4.5vw, 3.4rem);
  line-height: 1.18;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
}

.hero-desc {
  font-size: 1.12rem;
  line-height: 1.7;
  color: var(--text-muted);
  margin-bottom: 28px;
  max-width: 620px;
}

.hero-features-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 34px;
}

.hero-feature-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.95rem;
  color: #e2e8f0;
}

.hero-feature-item svg {
  color: var(--status-emerald);
  flex-shrink: 0;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

/* Original SVG Network Topology Visual */
.hero-visual-card {
  background: var(--surface-glass);
  backdrop-filter: blur(18px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-card);
  position: relative;
  overflow: hidden;
  transition: var(--transition);
}

.hero-visual-card:hover {
  border-color: var(--border-hover);
  box-shadow: var(--shadow-card-hover);
}

.topology-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-card);
  padding-bottom: 14px;
  margin-bottom: 18px;
}

.topology-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--text-main);
}

.topology-svg-wrap {
  width: 100%;
  height: 250px;
  background: radial-gradient(circle at center, rgba(31, 41, 55, 0.45) 0%, rgba(17, 24, 39, 0.9) 100%);
  border-radius: var(--radius-md);
  border: 1px solid rgba(255, 255, 255, 0.05);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.topology-node-tag {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.06);
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  margin-top: 14px;
  font-size: 0.85rem;
}

/* ==========================================================================
   03 | 核心数据 Core Metrics
   ========================================================================== */
.metrics-section {
  padding: 30px 0 65px;
}

.metrics-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.metric-card {
  background: var(--surface-glass);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 28px 22px;
  text-align: center;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.metric-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
  background: var(--surface-glass-active);
  box-shadow: var(--shadow-card-hover);
}

.metric-num {
  font-size: 2.8rem;
  font-weight: 800;
  font-family: var(--font-mono);
  letter-spacing: -0.03em;
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1.1;
  margin-bottom: 8px;
}

.metric-label {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 6px;
}

.metric-desc {
  font-size: 0.85rem;
  color: var(--text-dim);
}

/* ==========================================================================
   04 | 核心优势 Core Advantages
   ========================================================================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--surface-glass);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--primary), transparent);
  opacity: 0;
  transition: var(--transition);
}

.feature-card:hover {
  transform: translateY(-4px);
  background: var(--surface-glass-active);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-card-hover);
}

.feature-card:hover::before {
  opacity: 1;
}

.feature-icon-box {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: rgba(99, 102, 241, 0.12);
  border: 1px solid rgba(99, 102, 241, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  color: var(--secondary);
}

.feature-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-main);
}

.feature-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.68;
}

/* ==========================================================================
   05 | 全球节点 Global Nodes
   ========================================================================== */
.nodes-filter-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-bottom: 36px;
  flex-wrap: wrap;
}

.filter-btn {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  padding: 8px 18px;
  border-radius: var(--radius-full);
  color: var(--text-muted);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.filter-btn:hover {
  background: rgba(255, 255, 255, 0.09);
  color: var(--text-main);
  border-color: rgba(99, 102, 241, 0.3);
}

.filter-btn.active {
  background: var(--primary);
  color: #ffffff;
  border-color: var(--primary);
  box-shadow: 0 2px 12px rgba(99, 102, 241, 0.45);
}

.nodes-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.node-card {
  background: var(--surface-glass);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  padding: 22px;
  transition: var(--transition);
  box-shadow: var(--shadow-card);
}

.node-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-3px);
  background: var(--surface-glass-active);
  box-shadow: var(--shadow-card-hover);
}

.node-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
}

.node-location {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1.05rem;
  font-weight: 700;
}

.node-status-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  background: rgba(16, 185, 129, 0.15);
  color: var(--status-emerald);
  font-family: var(--font-mono);
}

.node-specs-row {
  display: flex;
  justify-content: space-between;
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  font-size: 0.8rem;
  color: var(--text-dim);
}

/* ==========================================================================
   06 | 套餐价格 Pricing Plans
   ========================================================================== */
.pricing-section {
  background: linear-gradient(180deg, rgba(8, 13, 28, 0) 0%, rgba(17, 24, 39, 0.5) 50%, rgba(8, 13, 28, 0) 100%);
}

.pricing-filter-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-bottom: 44px;
  flex-wrap: wrap;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
  align-items: stretch;
}

.pricing-card {
  background: var(--surface-glass);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 34px 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: var(--transition);
  position: relative;
  box-shadow: var(--shadow-card);
}

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

.pricing-card.popular {
  background: linear-gradient(180deg, rgba(27, 36, 54, 0.85) 0%, rgba(17, 24, 39, 0.95) 100%);
  border-color: var(--primary);
  box-shadow: 0 10px 40px -10px rgba(99, 102, 241, 0.35);
  transform: scale(1.02);
}

.pricing-card.popular:hover {
  transform: scale(1.02) translateY(-5px);
  box-shadow: 0 14px 45px -8px rgba(99, 102, 241, 0.45);
}

.popular-ribbon {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--gradient-brand);
  color: #ffffff;
  font-size: 0.78rem;
  font-weight: 700;
  padding: 4px 16px;
  border-radius: var(--radius-full);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.4);
}

.plan-header {
  margin-bottom: 20px;
}

.plan-name {
  font-size: 1.45rem;
  font-weight: 800;
  margin-bottom: 6px;
}

.plan-target {
  font-size: 0.85rem;
  color: var(--secondary);
  font-weight: 600;
  margin-bottom: 8px;
}

.plan-intro {
  font-size: 0.9rem;
  color: var(--text-muted);
  min-height: 40px;
}

.plan-price-wrap {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-card);
}

.price-currency {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-main);
}

.price-number {
  font-size: 3rem;
  font-weight: 800;
  font-family: var(--font-mono);
  letter-spacing: -0.03em;
  color: var(--text-main);
}

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

.plan-specs-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 13px;
  margin-bottom: 30px;
  flex: 1;
}

.plan-spec-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.92rem;
  color: var(--text-muted);
}

.plan-spec-item svg {
  flex-shrink: 0;
  margin-top: 3px;
  color: var(--status-emerald);
}

.plan-spec-item strong {
  color: var(--text-main);
}

/* ==========================================================================
   07 | 客户端下载 Client Downloads
   ========================================================================== */
.clients-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.client-card {
  background: var(--surface-glass);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 26px 22px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: var(--transition);
  box-shadow: var(--shadow-card);
}

.client-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
  background: var(--surface-glass-active);
  box-shadow: var(--shadow-card-hover);
}

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

.client-icon-box {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: rgba(99, 102, 241, 0.12);
  border: 1px solid rgba(99, 102, 241, 0.22);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--secondary);
}

.client-os-name {
  font-size: 1.15rem;
  font-weight: 700;
}

.client-recommended-app {
  font-size: 0.85rem;
  color: var(--text-dim);
}

.client-tutorial-box {
  background: rgba(255, 255, 255, 0.03);
  border-radius: var(--radius-sm);
  padding: 12px;
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.55;
  margin-bottom: 18px;
}

/* ==========================================================================
   08 | 技术架构 Technical Architecture
   ========================================================================== */
.tech-staggered-list {
  display: flex;
  flex-direction: column;
  gap: 50px;
}

.tech-staggered-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.tech-staggered-row.reverse {
  direction: rtl;
}

.tech-staggered-row.reverse > * {
  direction: ltr;
}

.tech-content-box {
  max-width: 520px;
}

.tech-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--secondary);
  background: rgba(59, 130, 246, 0.1);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  margin-bottom: 14px;
}

.tech-title {
  font-size: 1.85rem;
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.tech-desc {
  font-size: 1rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 20px;
}

.tech-visual-card {
  background: var(--surface-glass);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 240px;
  transition: var(--transition);
}

.tech-visual-card:hover {
  border-color: var(--border-hover);
  box-shadow: var(--shadow-card-hover);
}

/* ==========================================================================
   09 | 三步开始使用 Three Steps Quick Start
   ========================================================================== */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.step-card {
  background: var(--surface-glass);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 34px 28px;
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: var(--shadow-card);
  transition: var(--transition);
}

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

.step-num-badge {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--gradient-brand);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  font-weight: 800;
  font-family: var(--font-mono);
  margin-bottom: 20px;
  box-shadow: 0 4px 15px rgba(99, 102, 241, 0.4);
}

.step-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.step-desc {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 24px;
  flex: 1;
}

/* ==========================================================================
   10 | 使用场景 Use Cases
   ========================================================================== */
.scenes-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.scene-card {
  background: var(--surface-glass);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 30px 26px;
  transition: var(--transition);
  box-shadow: var(--shadow-card);
}

.scene-card:hover {
  transform: translateY(-4px);
  background: var(--surface-glass-active);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-card-hover);
}

.scene-icon {
  font-size: 2rem;
  margin-bottom: 16px;
  display: inline-block;
}

.scene-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.scene-desc {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* ==========================================================================
   11 | 全球网络覆盖 Global Network Map
   ========================================================================== */
.map-visual-wrap {
  background: var(--surface-glass);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 36px 30px;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.map-svg-container {
  width: 100%;
  max-width: 1000px;
  margin: 0 auto;
  position: relative;
}

.map-svg {
  width: 100%;
  height: auto;
  display: block;
}

.map-pin {
  cursor: pointer;
  transition: transform 0.25s ease;
}

.map-pin:hover {
  transform: scale(1.25);
}

.map-details-card {
  margin-top: 24px;
  background: rgba(17, 24, 39, 0.85);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

/* ==========================================================================
   12 | FAQ (常见问题解答)
   ========================================================================== */
.faq-wrap {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

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

.faq-item.active {
  border-color: var(--border-focus);
  background: var(--surface-glass-active);
}

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

.faq-question:hover {
  color: var(--secondary);
}

.faq-icon-arrow {
  transition: transform 0.3s ease;
  flex-shrink: 0;
  color: var(--text-dim);
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease-out, padding 0.35s ease-out;
  padding: 0 24px;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.7;
}

.faq-item.active .faq-answer {
  max-height: 400px;
  padding: 0 24px 22px;
}

/* ==========================================================================
   13 | 最终转化 CTA
   ========================================================================== */
.final-cta-section {
  margin: 40px auto 80px;
}

.cta-banner {
  background: linear-gradient(135deg, rgba(27, 36, 54, 0.9), rgba(17, 24, 39, 0.96));
  border: 1px solid rgba(99, 102, 241, 0.35);
  border-radius: var(--radius-lg);
  padding: 60px 40px;
  text-align: center;
  position: relative;
  overflow: hidden;
  box-shadow: 0 20px 50px -10px rgba(0, 0, 0, 0.6), 0 0 50px -10px rgba(99, 102, 241, 0.25);
}

.cta-banner::before {
  content: '';
  position: absolute;
  top: -100px;
  left: 50%;
  transform: translateX(-50%);
  width: 500px;
  height: 250px;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.25) 0%, rgba(139, 92, 246, 0) 70%);
  pointer-events: none;
}

.cta-slogan {
  display: inline-block;
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--secondary);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: 12px;
}

.cta-title {
  font-size: clamp(2rem, 3.8vw, 2.6rem);
  font-weight: 800;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.cta-desc {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 660px;
  margin: 0 auto 32px;
}

.cta-buttons {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

/* ==========================================================================
   14 | Footer
   ========================================================================== */
.site-footer {
  background: #040813;
  border-top: 1px solid var(--border-card);
  padding: 70px 0 35px;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.footer-top {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 50px;
}

.footer-brand-desc {
  margin: 16px 0 24px;
  color: var(--text-dim);
  font-size: 0.9rem;
  line-height: 1.65;
  max-width: 360px;
}

.footer-col-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 18px;
}

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

.footer-nav-link {
  color: var(--text-dim);
  text-decoration: none;
  transition: var(--transition);
}

.footer-nav-link:hover {
  color: var(--secondary);
}

.footer-bottom {
  padding-top: 30px;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.85rem;
  color: var(--text-dim);
}

/* Modal Dialog for Legal Texts */
.modal-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(4, 8, 19, 0.82);
  backdrop-filter: blur(10px);
  z-index: 1000;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.modal-overlay.open {
  display: flex;
}

.modal-card {
  background: var(--surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  max-width: 650px;
  width: 100%;
  max-height: 80vh;
  overflow-y: auto;
  padding: 32px;
  position: relative;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.85);
}

.modal-close-btn {
  position: absolute;
  top: 20px;
  right: 20px;
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 1.5rem;
  line-height: 1;
}

/* ==========================================================================
   Responsive Layout & Mobile Adaptation
   ========================================================================== */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .metrics-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .nodes-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 500px;
    margin: 0 auto;
  }
  .pricing-card.popular {
    transform: none;
  }
  .pricing-card.popular:hover {
    transform: translateY(-4px);
  }
  .clients-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .tech-staggered-row {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  .tech-staggered-row.reverse {
    direction: ltr;
  }
  .scenes-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .steps-grid {
    grid-template-columns: 1fr;
  }
  .footer-top {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .site-header {
    height: 64px;
  }

  .header-inner {
    height: 64px;
  }

  .nav-menu {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: rgba(8, 13, 28, 0.98);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-subtle);
    padding: 24px;
    flex-direction: column;
    gap: 16px;
    align-items: flex-start;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.7);
  }

  .nav-menu.open {
    display: flex;
  }

  .mobile-toggle {
    display: block;
  }

  .hero-section {
    padding: 50px 0 35px;
  }

  .hero-title {
    font-size: 2.25rem;
  }

  .section {
    padding: 60px 0;
  }

  .metrics-grid {
    grid-template-columns: 1fr;
  }

  .features-grid {
    grid-template-columns: 1fr;
  }

  .nodes-grid {
    grid-template-columns: 1fr;
  }

  .clients-grid {
    grid-template-columns: 1fr;
  }

  .scenes-grid {
    grid-template-columns: 1fr;
  }

  .footer-top {
    grid-template-columns: 1fr;
    gap: 30px;
  }

  .cta-banner {
    padding: 40px 24px;
  }
}

/* ==========================================================================
   Affiliate System & Disclosure Styles
   ========================================================================== */
.aff-disclosure-box {
  background: rgba(17, 24, 39, 0.65);
  border: 1px dashed rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-md);
  padding: 14px 20px;
  margin: 36px auto 0;
  max-width: 960px;
  font-size: 0.82rem;
  color: var(--text-dim);
  line-height: 1.65;
  text-align: center;
}

.aff-disclosure-box svg {
  vertical-align: -2px;
  margin-right: 6px;
  color: var(--secondary);
}

.aff-cta-disabled {
  opacity: 0.55 !important;
  cursor: not-allowed !important;
  filter: grayscale(0.8) !important;
  box-shadow: none !important;
}