/* ==========================================================================
   Bitz Net (thebitz.lol) - Pure Vanilla Modern CSS Design System
   High-Performance, Zero Heavy JS Frameworks, Instant Loading & Fully Responsive
   ========================================================================== */

:root {
  --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, "Liberation Mono", "Courier New", monospace;

  /* Color Palette */
  --bg-dark: #060913;
  --bg-card: rgba(14, 22, 38, 0.75);
  --bg-card-hover: rgba(22, 34, 58, 0.85);
  --bg-glass: rgba(10, 16, 29, 0.65);
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-glow: rgba(0, 242, 254, 0.35);

  --cyan-primary: #00f2fe;
  --blue-primary: #4facfe;
  --indigo-primary: #6366f1;
  --purple-primary: #7f00ff;
  --emerald-accent: #10b981;
  --amber-accent: #f59e0b;
  --rose-accent: #f43f5e;

  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  --shadow-card: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 25px rgba(0, 242, 254, 0.25);
  --shadow-btn: 0 8px 20px -6px rgba(0, 242, 254, 0.4);

  --container-max: 1240px;
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  font-family: var(--font-sans);
  background-color: var(--bg-dark);
  color: var(--text-main);
  line-height: 1.6;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  position: relative;
  min-height: 100vh;
  overflow-x: hidden;
}

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

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

ul, ol {
  list-style: none;
}

/* ==========================================================================
   Full-Screen Cyber Blue Plexus Mesh Canvas (蓝网节点拓扑连接网)
   ========================================================================== */
#dynamic-bg {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  z-index: -2;
  pointer-events: none;
  background-color: #030712;
}

.dynamic-background {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -1;
  overflow: hidden;
  background-color: transparent;
}

/* 顶部科技光束射灯（Top Cyber Spotlight / Aurora） */
.dynamic-background::before {
  content: "";
  position: absolute;
  top: -15%;
  left: 50%;
  transform: translateX(-50%);
  width: 90vw;
  height: 65vh;
  background: radial-gradient(ellipse 70% 60% at 50% 0%, rgba(0, 210, 255, 0.32) 0%, rgba(14, 165, 233, 0.18) 45%, rgba(37, 99, 235, 0.06) 75%, transparent 100%);
  filter: blur(50px);
  animation: techPulse 8s ease-in-out infinite alternate;
  will-change: opacity, transform;
}

/* 斜向激光流光掠影（Cyber Laser Sweeping Beam） */
.dynamic-background::after {
  content: "";
  position: absolute;
  inset: -50%;
  background: linear-gradient(125deg, transparent 40%, rgba(0, 242, 254, 0.05) 48%, rgba(56, 189, 248, 0.12) 52%, transparent 60%);
  transform: rotate(-10deg);
  animation: beamSweep 16s ease-in-out infinite;
  pointer-events: none;
}

/* 1. 科技电路与准星走线层 (Cyber Circuit Board Lines) */
.bg-circuit-lines {
  position: absolute;
  inset: 0;
  background-image: url('assets/circuit-lines.svg');
  background-size: 240px 240px;
  background-repeat: repeat;
  opacity: 0.68;
  mask-image: radial-gradient(circle at 50% 40%, black 50%, transparent 94%);
  -webkit-mask-image: radial-gradient(circle at 50% 40%, black 50%, transparent 94%);
  animation: circuitPulse 10s ease-in-out infinite alternate;
  pointer-events: none;
}

@keyframes circuitPulse {
  0% { opacity: 0.52; filter: drop-shadow(0 0 2px rgba(0, 242, 254, 0.3)); }
  50% { opacity: 0.88; filter: drop-shadow(0 0 7px rgba(0, 242, 254, 0.7)); }
  100% { opacity: 0.6; filter: drop-shadow(0 0 3px rgba(0, 242, 254, 0.4)); }
}

/* 2. 底部3D透视科技地平线网格线条 (3D Perspective Cyber Horizon Grid) */
.bg-cyber-floor {
  position: absolute;
  bottom: -80px;
  left: -25%;
  right: -25%;
  height: 420px;
  background-image: 
    linear-gradient(to right, rgba(0, 242, 254, 0.28) 1.5px, transparent 1.5px),
    linear-gradient(to bottom, rgba(0, 242, 254, 0.28) 1.5px, transparent 1.5px);
  background-size: 60px 60px;
  transform: perspective(420px) rotateX(72deg);
  transform-origin: bottom center;
  mask-image: linear-gradient(to top, rgba(0,0,0,1) 25%, transparent 95%);
  -webkit-mask-image: linear-gradient(to top, rgba(0,0,0,1) 25%, transparent 95%);
  animation: floorLineMove 16s linear infinite;
  pointer-events: none;
}

@keyframes floorLineMove {
  0% { background-position: 0 0; }
  100% { background-position: 0 600px; }
}

/* 3. 垂直高速光纤流光线条 (Vertical Fiber Optic Data Streams) */
.bg-stream-line {
  position: absolute;
  top: -160px;
  width: 2px;
  height: 160px;
  background: linear-gradient(180deg, transparent 0%, rgba(0, 242, 254, 0.3) 30%, #00f2fe 80%, #ffffff 100%);
  box-shadow: 0 0 12px #00f2fe, 0 0 24px rgba(0, 242, 254, 0.8);
  border-radius: 999px;
  opacity: 0;
  will-change: transform, opacity;
  animation: streamFall linear infinite;
  pointer-events: none;
}

.bg-stream-line.l-1 { left: 12%; animation-duration: 6.5s; animation-delay: 0s; }
.bg-stream-line.l-2 { left: 28%; animation-duration: 8.5s; animation-delay: 2.2s; }
.bg-stream-line.l-3 { left: 52%; animation-duration: 7s; animation-delay: 1.1s; }
.bg-stream-line.l-4 { left: 74%; animation-duration: 9s; animation-delay: 4.2s; }
.bg-stream-line.l-5 { left: 90%; animation-duration: 7.8s; animation-delay: 3s; }

@keyframes streamFall {
  0% {
    transform: translate3d(0, -100px, 0);
    opacity: 0;
  }
  15% {
    opacity: 0.95;
  }
  85% {
    opacity: 0.95;
  }
  100% {
    transform: translate3d(0, 115vh, 0);
    opacity: 0;
  }
}

/* 4. 横向贯穿科技数据传输线 (Horizontal Circuit Pulse Lines) */
.bg-h-line-1, .bg-h-line-2 {
  position: absolute;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent 0%, rgba(0, 242, 254, 0.22) 20%, rgba(0, 242, 254, 0.38) 50%, rgba(0, 242, 254, 0.22) 80%, transparent 100%);
  box-shadow: 0 0 10px rgba(0, 242, 254, 0.35);
  pointer-events: none;
}
.bg-h-line-1 { top: 24%; }
.bg-h-line-2 { top: 68%; }

.bg-h-line-1::after, .bg-h-line-2::after {
  content: "";
  position: absolute;
  top: -1px;
  width: 140px;
  height: 3px;
  background: linear-gradient(90deg, transparent, #00f2fe, #ffffff, #00f2fe, transparent);
  box-shadow: 0 0 16px #00f2fe;
  border-radius: 2px;
  animation: hDataPacket 12s cubic-bezier(0.4, 0, 0.2, 1) infinite;
}

.bg-h-line-2::after {
  animation-duration: 16s;
  animation-delay: 6s;
  animation-direction: reverse;
}

@keyframes hDataPacket {
  0% { left: -150px; opacity: 0; }
  10% { opacity: 1; }
  90% { opacity: 1; }
  100% { left: 100%; opacity: 0; }
}

/* 5. 科技微网格与雷达扫描线（Tech Grid & Scanline） */
.bg-grid-pattern {
  position: absolute;
  inset: 0;
  background-image: 
    linear-gradient(to right, rgba(0, 242, 254, 0.06) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(56, 189, 248, 0.06) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(circle at 50% 35%, black 45%, transparent 88%);
  -webkit-mask-image: radial-gradient(circle at 50% 35%, black 45%, transparent 88%);
}

.bg-grid-pattern::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, transparent 0%, rgba(0, 242, 254, 0.3) 25%, rgba(56, 189, 248, 0.9) 50%, rgba(0, 242, 254, 0.3) 75%, transparent 100%);
  box-shadow: 0 0 18px rgba(0, 242, 254, 0.9), 0 0 35px rgba(59, 130, 246, 0.6);
  animation: scanline 10s cubic-bezier(0.4, 0, 0.2, 1) infinite;
  opacity: 0.6;
}

/* 浮动蓝色能量光团（Floating Cyber Blue Nebulas） */
.bg-orb-1, .bg-orb-2, .bg-orb-3 {
  position: absolute;
  border-radius: 50%;
  will-change: transform;
}

/* 核心蓝光（青蓝强荧光） */
.bg-orb-1 {
  width: 600px;
  height: 600px;
  top: -60px;
  left: 15%;
  background: radial-gradient(circle, rgba(0, 242, 254, 0.38) 0%, rgba(14, 165, 233, 0.22) 50%, transparent 75%);
  filter: blur(95px);
  animation: floatBlueOrb1 18s ease-in-out infinite alternate;
}

/* 侧翼深邃科技蓝（深空宝蓝光感） */
.bg-orb-2 {
  width: 700px;
  height: 700px;
  top: 25%;
  right: -5%;
  background: radial-gradient(circle, rgba(37, 99, 235, 0.36) 0%, rgba(2, 132, 199, 0.24) 45%, rgba(3, 105, 161, 0.08) 70%, transparent 100%);
  filter: blur(110px);
  animation: floatBlueOrb2 22s ease-in-out infinite alternate;
}

/* 底部流动极光蓝（冰晶蔚蓝） */
.bg-orb-3 {
  width: 520px;
  height: 520px;
  bottom: 0%;
  left: 20%;
  background: radial-gradient(circle, rgba(56, 189, 248, 0.32) 0%, rgba(30, 64, 175, 0.25) 55%, transparent 80%);
  filter: blur(100px);
  animation: floatBlueOrb3 20s ease-in-out infinite alternate;
}

@keyframes techPulse {
  0% {
    opacity: 0.8;
    transform: translateX(-50%) scale(0.95);
  }
  100% {
    opacity: 1;
    transform: translateX(-50%) scale(1.08);
  }
}

@keyframes beamSweep {
  0% {
    transform: translateY(-40%) rotate(-10deg);
    opacity: 0.2;
  }
  50% {
    transform: translateY(10%) rotate(-10deg);
    opacity: 0.8;
  }
  100% {
    transform: translateY(60%) rotate(-10deg);
    opacity: 0.2;
  }
}

@keyframes scanline {
  0% {
    top: -5%;
    opacity: 0;
  }
  15% {
    opacity: 0.85;
  }
  85% {
    opacity: 0.85;
  }
  100% {
    top: 105%;
    opacity: 0;
  }
}

@keyframes floatBlueOrb1 {
  0% { transform: translate3d(0, 0, 0) scale(1); }
  50% { transform: translate3d(90px, 70px, 0) scale(1.15); }
  100% { transform: translate3d(-50px, 110px, 0) scale(0.92); }
}

@keyframes floatBlueOrb2 {
  0% { transform: translate3d(0, 0, 0) scale(1); }
  50% { transform: translate3d(-110px, -80px, 0) scale(1.12); }
  100% { transform: translate3d(60px, -60px, 0) scale(0.88); }
}

@keyframes floatBlueOrb3 {
  0% { transform: translate3d(0, 0, 0) scale(0.9); }
  50% { transform: translate3d(70px, -90px, 0) scale(1.22); }
  100% { transform: translate3d(-80px, 40px, 0) scale(1.02); }
}

/* ==========================================================================
   Layout Containers & Common Elements
   ========================================================================== */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

.section {
  padding-top: 80px;
  padding-bottom: 80px;
}

.section-header {
  text-align: center;
  max-width: 800px;
  margin: 0 auto 50px auto;
}

.badge-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  background: rgba(0, 242, 254, 0.1);
  border: 1px solid rgba(0, 242, 254, 0.3);
  color: var(--cyan-primary);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  margin-bottom: 16px;
}

.badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--emerald-accent);
  box-shadow: 0 0 10px var(--emerald-accent);
  animation: pulseDot 2s infinite;
}

@keyframes pulseDot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.85); }
}

.section-title {
  font-size: 2.35rem;
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}

.text-gradient,
.section-title .text-gradient {
  background: linear-gradient(135deg, #00f2fe 0%, #38bdf8 45%, #60a5fa 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 28px;
  border-radius: var(--radius-full);
  font-weight: 700;
  font-size: 1rem;
  cursor: pointer;
  transition: all var(--transition-normal);
  border: none;
  text-align: center;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, #00f2fe 0%, #4facfe 50%, #7f00ff 100%);
  color: #030712;
  box-shadow: var(--shadow-btn);
  position: relative;
  overflow: hidden;
}

.btn-primary::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.4), transparent);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 28px -4px rgba(0, 242, 254, 0.6);
  color: #000;
}

.btn-primary:hover::before {
  opacity: 1;
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  color: var(--text-main);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.25);
  transform: translateY(-2px);
}

.btn-sm {
  padding: 9px 18px;
  font-size: 0.9rem;
}

.btn-block {
  width: 100%;
}

/* ==========================================================================
   Header & Navbar (Fixed Glassmorphism)
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  width: 100%;
  z-index: 100;
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  transition: background var(--transition-normal);
}

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

.brand-logo-link {
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand-logo-img {
  height: 42px;
  width: auto;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-muted);
  position: relative;
  padding: 6px 0;
}

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

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background: var(--cyan-primary);
  transition: width var(--transition-fast);
}

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

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

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero-section {
  padding-top: 100px;
  padding-bottom: 70px;
  text-align: center;
  position: relative;
}

.hero-content {
  max-width: 1140px;
  margin: 0 auto;
}

.hero-title {
  font-size: clamp(2.2rem, 3.8vw, 3.2rem);
  font-weight: 900;
  line-height: 1.3;
  letter-spacing: -1px;
  margin-bottom: 22px;
}

.hero-title-sub {
  display: inline-block;
  font-size: clamp(1.2rem, 2.45vw, 2.15rem);
  white-space: nowrap;
  letter-spacing: normal;
  margin-top: 6px;
}

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

.hero-subtitle strong {
  color: var(--cyan-primary);
  font-weight: 600;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  flex-wrap: wrap;
  margin-bottom: 50px;
}

.hero-meta-strip {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 32px;
  flex-wrap: wrap;
  padding: 16px 28px;
  background: rgba(14, 22, 38, 0.6);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  max-width: 860px;
  margin: 0 auto;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.hero-meta-item {
  display: flex;
  align-items: center;
  gap: 8px;
}

.hero-meta-item svg {
  width: 18px;
  height: 18px;
  color: var(--cyan-primary);
}

.hero-meta-item strong {
  color: var(--text-main);
}

/* Stats Counter Grid */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 60px;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 24px 20px;
  text-align: center;
  backdrop-filter: blur(12px);
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

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

.stat-value {
  font-size: 2.2rem;
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 6px;
  background: linear-gradient(135deg, #00f2fe 0%, #4facfe 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.stat-label {
  font-size: 0.88rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* ==========================================================================
   Core Advantages & Features Grid
   ========================================================================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  backdrop-filter: blur(12px);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--cyan-primary), transparent);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.feature-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-glow);
  box-shadow: var(--shadow-card), var(--shadow-glow);
  background: var(--bg-card-hover);
}

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

.feature-icon-wrap {
  width: 54px;
  height: 54px;
  border-radius: 14px;
  background: rgba(0, 242, 254, 0.1);
  border: 1px solid rgba(0, 242, 254, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  color: var(--cyan-primary);
}

.feature-title {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.feature-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* ==========================================================================
   PRICING SECTION - ALL PRICING CARDS IN THE SAME ROW
   Strict Requirement: "所有价格要同排"
   ========================================================================== */
.pricing-section {
  position: relative;
}

.pricing-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 36px 30px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  backdrop-filter: blur(16px);
  position: relative;
  transition: all var(--transition-normal);
}

.pricing-card:hover {
  transform: translateY(-8px);
  border-color: var(--border-glow);
  box-shadow: 0 20px 40px -15px rgba(0, 0, 0, 0.6), var(--shadow-glow);
}

.pricing-card.featured {
  background: linear-gradient(180deg, rgba(20, 32, 60, 0.85) 0%, rgba(10, 16, 30, 0.9) 100%);
  border: 2px solid var(--cyan-primary);
  box-shadow: 0 15px 35px -10px rgba(0, 242, 254, 0.25);
}

.pricing-ribbon {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, #00f2fe 0%, #7f00ff 100%);
  color: #030712;
  font-size: 0.8rem;
  font-weight: 800;
  padding: 4px 16px;
  border-radius: var(--radius-full);
  letter-spacing: 0.5px;
  text-transform: uppercase;
  box-shadow: 0 4px 12px rgba(0, 242, 254, 0.4);
}

.pricing-header {
  margin-bottom: 24px;
  text-align: center;
}

.plan-name {
  font-size: 1.4rem;
  font-weight: 800;
  margin-bottom: 8px;
}

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

.pricing-amount-wrap {
  margin-top: 18px;
  padding: 16px 0;
  border-top: 1px dashed var(--border-subtle);
  border-bottom: 1px dashed var(--border-subtle);
}

.price-currency {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--cyan-primary);
  vertical-align: top;
  position: relative;
  top: 6px;
}

.price-number {
  font-size: 3rem;
  font-weight: 900;
  letter-spacing: -1px;
  line-height: 1;
  color: #fff;
}

.price-period {
  font-size: 0.95rem;
  color: var(--text-muted);
}

.price-sub-calc {
  font-size: 0.82rem;
  color: var(--cyan-primary);
  margin-top: 6px;
  font-weight: 600;
}

.pricing-features-list {
  margin: 24px 0 32px 0;
  display: flex;
  flex-direction: column;
  gap: 13px;
  flex-grow: 1;
}

.pricing-feature-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.92rem;
  color: #cbd5e1;
  line-height: 1.5;
}

.pricing-feature-item svg {
  width: 18px;
  height: 18px;
  color: var(--emerald-accent);
  flex-shrink: 0;
  margin-top: 2px;
}

.pricing-feature-item.muted {
  color: var(--text-dim);
  text-decoration: line-through;
}

.pricing-feature-item.muted svg {
  color: var(--text-dim);
}

.pricing-cta-wrap {
  margin-top: auto;
}

.pricing-notice {
  text-align: center;
  font-size: 0.82rem;
  color: var(--text-dim);
  margin-top: 12px;
}

/* ==========================================================================
   Speed Test & Realtime Latency Matrix
   ========================================================================== */
.speed-matrix-box {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
  backdrop-filter: blur(12px);
}

.speed-table-wrap {
  width: 100%;
  overflow-x: auto;
}

.speed-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.93rem;
}

.speed-table th {
  background: rgba(255, 255, 255, 0.03);
  padding: 16px 20px;
  font-weight: 700;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border-subtle);
}

.speed-table td {
  padding: 16px 20px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  color: var(--text-main);
}

.speed-table tr:hover td {
  background: rgba(255, 255, 255, 0.02);
}

.node-region-cell {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
}

.flag-tag {
  display: inline-block;
  padding: 2px 6px;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.08);
  font-size: 0.78rem;
  font-family: var(--font-mono);
}

.speed-bar-container {
  width: 100%;
  max-width: 180px;
  height: 8px;
  background: rgba(255, 255, 255, 0.06);
  border-radius: 4px;
  overflow: hidden;
  margin-top: 4px;
}

.speed-bar-fill {
  height: 100%;
  border-radius: 4px;
  background: linear-gradient(90deg, #00f2fe, #10b981);
}

.status-badge-ok {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 3px 8px;
  border-radius: 12px;
  background: rgba(16, 185, 129, 0.12);
  color: #34d399;
  font-size: 0.82rem;
  font-weight: 600;
}

/* ==========================================================================
   Client Ecosystem & Setup Cards
   ========================================================================== */
.client-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.client-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 24px;
  text-align: center;
  transition: all var(--transition-fast);
}

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

.client-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto 16px auto;
  color: var(--cyan-primary);
}

.client-name {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.client-tags {
  font-size: 0.82rem;
  color: var(--text-dim);
  line-height: 1.4;
}

/* ==========================================================================
   Articles Showcase Section (SEO Content Hub)
   ========================================================================== */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  backdrop-filter: blur(12px);
  transition: all var(--transition-normal);
}

.article-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-glow);
  box-shadow: 0 16px 30px -10px rgba(0, 242, 254, 0.2);
}

.article-tag {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--cyan-primary);
  text-transform: uppercase;
  margin-bottom: 12px;
}

.article-card-title {
  font-size: 1.08rem;
  font-weight: 700;
  line-height: 1.45;
  margin-bottom: 10px;
  color: #fff;
  transition: color var(--transition-fast);
}

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

.article-card-excerpt {
  font-size: 0.86rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 18px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--text-dim);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 12px;
  margin-top: auto;
}

.article-read-link {
  color: var(--cyan-primary);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.article-read-link:hover {
  text-decoration: underline;
}

/* ==========================================================================
   Customer Reviews (用户评价)
   ========================================================================== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px;
  backdrop-filter: blur(12px);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all var(--transition-fast);
}

.review-card:hover {
  transform: translateY(-4px);
  border-color: rgba(255, 255, 255, 0.2);
  background: var(--bg-card-hover);
}

.review-stars {
  color: var(--amber-accent);
  font-size: 1.1rem;
  letter-spacing: 2px;
  margin-bottom: 14px;
}

.review-text {
  font-size: 0.95rem;
  color: #e2e8f0;
  line-height: 1.65;
  margin-bottom: 20px;
  font-style: italic;
}

.review-user-info {
  display: flex;
  align-items: center;
  gap: 12px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: 14px;
}

.review-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, #00f2fe, #7f00ff);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1rem;
  color: #000;
}

.review-user-meta h4 {
  font-size: 0.95rem;
  font-weight: 700;
  color: #fff;
}

.review-user-meta span {
  font-size: 0.8rem;
  color: var(--text-dim);
}

/* ==========================================================================
   FAQ Accordion Section
   ========================================================================== */
.faq-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  max-width: 1100px;
  margin: 0 auto;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 24px;
  backdrop-filter: blur(12px);
  transition: border-color var(--transition-fast);
}

.faq-item:hover {
  border-color: rgba(0, 242, 254, 0.3);
}

.faq-question {
  font-size: 1.08rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 10px;
  display: flex;
  align-items: flex-start;
  gap: 8px;
}

.faq-question span.q-icon {
  color: var(--cyan-primary);
  font-weight: 800;
}

.faq-answer {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.65;
  padding-left: 20px;
}

/* ==========================================================================
   SEO Keywords Cloud & External Links (外链)
   ========================================================================== */
.seo-cloud-section {
  padding: 40px 0;
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
  background: rgba(8, 13, 24, 0.5);
}

.seo-tags-wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
  margin-top: 16px;
}

.seo-chip {
  padding: 6px 14px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
  font-size: 0.82rem;
  color: var(--text-muted);
  transition: all var(--transition-fast);
}

.seo-chip:hover {
  background: rgba(0, 242, 254, 0.1);
  color: var(--cyan-primary);
  border-color: var(--cyan-primary);
}

.friendly-links-wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
  margin-top: 20px;
  font-size: 0.86rem;
  color: var(--text-dim);
}

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

.friendly-link:hover {
  color: var(--cyan-primary);
  text-decoration: underline;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  background: #03060d;
  border-top: 1px solid var(--border-subtle);
  padding: 60px 0 30px 0;
  font-size: 0.9rem;
  color: var(--text-dim);
}

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

.footer-brand p {
  margin-top: 14px;
  line-height: 1.6;
  max-width: 320px;
}

.footer-col h5 {
  font-size: 1rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 16px;
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

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

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

/* ==========================================================================
   Article Single Page Styles
   ========================================================================== */
.article-header {
  padding-top: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--border-subtle);
}

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

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

.breadcrumb-separator {
  color: var(--text-dim);
}

.article-title {
  font-size: 2.5rem;
  font-weight: 900;
  line-height: 1.25;
  margin-bottom: 18px;
  letter-spacing: -0.5px;
}

.article-meta-bar {
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 0.88rem;
  color: var(--text-muted);
  flex-wrap: wrap;
}

.article-body {
  max-width: 860px;
  margin: 0 auto;
  padding: 50px 0;
  font-size: 1.05rem;
  line-height: 1.85;
  color: #e2e8f0;
}

.article-body h2 {
  font-size: 1.75rem;
  font-weight: 800;
  color: #fff;
  margin-top: 48px;
  margin-bottom: 18px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-subtle);
  position: relative;
}

.article-body h2::before {
  content: "";
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 48px;
  height: 2px;
  background: var(--cyan-primary);
}

.article-body h3 {
  font-size: 1.35rem;
  font-weight: 700;
  color: #f1f5f9;
  margin-top: 32px;
  margin-bottom: 14px;
}

.article-body p {
  margin-bottom: 22px;
}

.article-body ul, .article-body ol {
  margin-bottom: 24px;
  padding-left: 24px;
}

.article-body ul {
  list-style-type: disc;
}

.article-body ol {
  list-style-type: decimal;
}

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

.article-body strong {
  color: #fff;
  font-weight: 700;
}

.article-callout {
  background: rgba(0, 242, 254, 0.06);
  border-left: 4px solid var(--cyan-primary);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 20px 24px;
  margin: 28px 0;
}

.article-callout.tip {
  background: rgba(16, 185, 129, 0.08);
  border-left-color: var(--emerald-accent);
}

.article-callout.warning {
  background: rgba(245, 158, 11, 0.08);
  border-left-color: var(--amber-accent);
}

.article-table {
  width: 100%;
  border-collapse: collapse;
  margin: 28px 0;
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 1px solid var(--border-subtle);
}

.article-table th {
  background: rgba(255, 255, 255, 0.05);
  padding: 12px 16px;
  font-weight: 700;
  color: var(--cyan-primary);
  text-align: left;
}

.article-table td {
  padding: 12px 16px;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  font-size: 0.95rem;
}

.article-cta-box {
  background: linear-gradient(135deg, rgba(14, 22, 38, 0.95) 0%, rgba(20, 32, 60, 0.95) 100%);
  border: 1px solid var(--border-glow);
  border-radius: var(--radius-lg);
  padding: 36px 30px;
  text-align: center;
  margin: 48px 0;
  box-shadow: var(--shadow-glow);
}

.article-cta-box h3 {
  font-size: 1.5rem;
  font-weight: 800;
  margin-top: 0;
  margin-bottom: 12px;
  color: #fff;
}

.article-cta-box p {
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto 24px auto;
}

.article-related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 30px;
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */
@media (max-width: 1100px) {
  .hero-title {
    font-size: 2.8rem;
  }
  .features-grid, .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .client-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 868px) {
  .nav-menu {
    display: none;
  }
  .hero-title {
    font-size: 2.1rem;
  }
  .hero-title-sub {
    font-size: clamp(1rem, 3.2vw, 1.45rem);
    white-space: nowrap;
  }
  .hero-subtitle {
    font-size: 1.05rem;
  }
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  /* On tablet/mobile, we keep cards readable while horizontal scrolling or stacked with same flex row */
  .pricing-row {
    grid-template-columns: 1fr;
    max-width: 480px;
    margin: 0 auto;
  }
  .features-grid, .reviews-grid, .faq-grid {
    grid-template-columns: 1fr;
  }
  .footer-top {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  .article-title {
    font-size: 1.85rem;
  }
  .article-related-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 1.6rem;
  }
  .hero-title-sub {
    font-size: clamp(0.82rem, 4.2vw, 1.05rem);
    white-space: nowrap;
  }
  .hero-actions {
    flex-direction: column;
    width: 100%;
  }
  .hero-actions .btn {
    width: 100%;
  }
  .stats-grid {
    grid-template-columns: 1fr;
  }
  .articles-grid {
    grid-template-columns: 1fr;
  }
}