/* ==========================================================================
   CyberGhost VPN (cyberghost.my) - 官方极客工程设计系统
   视觉意象：深空哑光碳素黑底色 + 电荷超导荧光紫罗兰 / 脉冲激光钛金高光渐变
   ========================================================================== */

:root {
  /* 基础核心底色：深空哑光碳素黑 (Deep Carbon Matte Void) */
  --bg-void: #07080b;
  --bg-primary: #0b0d13;
  --bg-secondary: #11141e;
  --bg-card: rgba(17, 20, 30, 0.72);
  --bg-card-hover: rgba(24, 28, 42, 0.85);
  --bg-glass: rgba(15, 18, 28, 0.85);

  /* 主题色 1：电荷超导荧光紫罗兰 (Superconducting Ultraviolet) */
  --uv-purple: #a855f7;
  --uv-purple-light: #c084fc;
  --uv-purple-dark: #7e22ce;
  --uv-glow: rgba(168, 85, 247, 0.32);
  --uv-subtle: rgba(168, 85, 247, 0.12);

  /* 主题色 2：脉冲激光钛金高光渐变 (Pulse Titanium Gold) */
  --pulse-gold: #f59e0b;
  --pulse-gold-light: #fbbf24;
  --pulse-gold-bright: #fde047;
  --pulse-gold-glow: rgba(245, 158, 11, 0.35);
  --pulse-gold-subtle: rgba(245, 158, 11, 0.12);

  /* 辅助状态指示色 */
  --quantum-cyan: #00f5d4;
  --quantum-cyan-glow: rgba(0, 245, 212, 0.3);
  --matrix-green: #10b981;
  --alert-red: #f43f5e;

  /* 文字颜色层级 */
  --text-main: #f8fafc;
  --text-sub: #cbd5e1;
  --text-muted: #94a3b8;
  --text-dim: #64748b;

  /* 边框体系 */
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-light: rgba(255, 255, 255, 0.14);
  --border-uv: rgba(168, 85, 247, 0.35);
  --border-gold: rgba(245, 158, 11, 0.35);

  /* 字体家族 */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", "Cascadia Code", Consolas, Monaco, monospace;

  /* 间距与圆角 */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  --container-max: 1200px;
  --header-height: 72px;
}

/* 基础重置与工程网格底纹 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
  -webkit-text-size-adjust: 100%;
}

body {
  background-color: var(--bg-void);
  color: var(--text-main);
  font-family: var(--font-sans);
  line-height: 1.6;
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  background-image: 
    radial-gradient(circle at 15% 15%, rgba(168, 85, 247, 0.08) 0%, transparent 45%),
    radial-gradient(circle at 85% 30%, rgba(245, 158, 11, 0.06) 0%, transparent 50%),
    linear-gradient(to right, rgba(255, 255, 255, 0.015) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.015) 1px, transparent 1px);
  background-size: 100% 100%, 100% 100%, 48px 48px, 48px 48px;
}

/* 链接全局重置 */
a {
  color: inherit;
  text-decoration: none;
}

/* 统一容器 */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

/* ==========================================================================
   Header 导航栏 (统一简洁 Logo: CyberGhost，无任何后缀)
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  height: var(--header-height);
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle);
  transition: border-color 0.3s ease, background 0.3s ease;
}

.site-header.scrolled {
  border-color: rgba(168, 85, 247, 0.25);
  background: rgba(7, 8, 11, 0.95);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.6);
}

.nav-container {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* 品牌 Logo */
.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -0.5px;
  color: #ffffff;
  transition: opacity 0.2s;
}

.brand-logo:hover {
  opacity: 0.92;
}

.brand-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--uv-purple), var(--pulse-gold));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #07080b;
  box-shadow: 0 0 18px var(--uv-glow);
}

.brand-name {
  font-size: 20px;
  font-weight: 800;
  background: linear-gradient(135deg, #ffffff 40%, var(--uv-purple-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* 导航链接 */
.nav-menu {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-sub);
  position: relative;
  padding: 8px 0;
  transition: color 0.2s ease;
}

.nav-link:hover, .nav-link.active {
  color: #ffffff;
}

.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--uv-purple), var(--pulse-gold));
  border-radius: 2px;
  box-shadow: 0 0 8px var(--uv-glow);
}

/* 导航操作区 */
.nav-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.mobile-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-sub);
  padding: 6px;
  cursor: pointer;
}

/* ==========================================================================
   按钮样式体系 (电荷超导荧光紫罗兰 + 脉冲钛金渐变高光)
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 600;
  padding: 10px 22px;
  border-radius: var(--radius-md);
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  cursor: pointer;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--uv-purple) 0%, #7e22ce 50%, var(--pulse-gold) 100%);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.2);
  box-shadow: 0 4px 18px var(--uv-glow), 0 2px 8px var(--pulse-gold-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(168, 85, 247, 0.5), 0 3px 12px var(--pulse-gold-glow);
  filter: brightness(1.1);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-main);
  border: 1px solid var(--border-subtle);
  backdrop-filter: blur(8px);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.09);
  border-color: var(--border-light);
  transform: translateY(-2px);
}

.btn-gold {
  background: linear-gradient(135deg, var(--pulse-gold) 0%, #d97706 100%);
  color: #07080b;
  font-weight: 700;
  border: 1px solid var(--pulse-gold-bright);
  box-shadow: 0 4px 16px var(--pulse-gold-glow);
}

.btn-gold:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 22px rgba(245, 158, 11, 0.55);
}

.btn-sm {
  font-size: 13px;
  padding: 7px 14px;
  border-radius: var(--radius-sm);
}

.btn-lg {
  font-size: 16px;
  padding: 14px 30px;
  border-radius: var(--radius-lg);
}

/* ==========================================================================
   排版与基础 Section
   ========================================================================== */
.section {
  padding-top: 80px;
  padding-bottom: 80px;
  position: relative;
}

.section-alt {
  background: linear-gradient(180deg, rgba(17, 20, 30, 0.5) 0%, rgba(7, 8, 11, 0.8) 100%);
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

.section-header {
  text-align: center;
  max-width: 780px;
  margin: 0 auto 56px auto;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--uv-purple-light);
  background: var(--uv-subtle);
  border: 1px solid var(--border-uv);
  padding: 5px 14px;
  border-radius: var(--radius-full);
  margin-bottom: 16px;
}

.section-tag.gold {
  color: var(--pulse-gold-light);
  background: var(--pulse-gold-subtle);
  border-color: var(--border-gold);
}

.section-tag.cyan {
  color: var(--quantum-cyan);
  background: rgba(0, 245, 212, 0.1);
  border-color: rgba(0, 245, 212, 0.3);
}

.section-title {
  font-size: 36px;
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.8px;
  color: #ffffff;
  margin-bottom: 16px;
}

.section-desc {
  font-size: 16px;
  color: var(--text-sub);
  line-height: 1.7;
}

/* 高光字 */
.text-gradient-uv {
  background: linear-gradient(135deg, var(--uv-purple-light), #e9d5ff);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.text-gradient-gold {
  background: linear-gradient(135deg, var(--pulse-gold-light), var(--pulse-gold-bright));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.text-gradient-hybrid {
  background: linear-gradient(135deg, #ffffff 10%, var(--uv-purple-light) 60%, var(--pulse-gold-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* ==========================================================================
   Hero 英雄主视觉区 (差异化定位：后量子、DPDK线速、Anycast CN2-GIA)
   ========================================================================== */
.hero-section {
  padding-top: 90px;
  padding-bottom: 80px;
  position: relative;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 50px;
  align-items: center;
}

.hero-pill-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 22px;
}

.hero-title {
  font-size: 46px;
  font-weight: 900;
  line-height: 1.18;
  letter-spacing: -1.2px;
  margin-bottom: 22px;
  color: #ffffff;
}

.hero-lead {
  font-size: 17px;
  line-height: 1.75;
  color: var(--text-sub);
  margin-bottom: 34px;
}

.hero-lead strong {
  color: #ffffff;
  font-weight: 600;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 36px;
}

.hero-trust-row {
  display: flex;
  align-items: center;
  gap: 28px;
  padding-top: 24px;
  border-top: 1px solid var(--border-subtle);
}

.trust-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-muted);
}

.trust-item svg {
  color: var(--quantum-cyan);
}

/* Hero 右侧特种超算矩阵面板 */
.hero-quantum-terminal {
  background: var(--bg-card);
  border: 1px solid var(--border-uv);
  border-radius: var(--radius-xl);
  padding: 26px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.7), 0 0 30px var(--uv-subtle);
  position: relative;
  backdrop-filter: blur(16px);
}

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

.window-dots {
  display: flex;
  gap: 7px;
}

.window-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}
.window-dot.red { background: #ef4444; }
.window-dot.yellow { background: #f59e0b; }
.window-dot.green { background: #10b981; }

.terminal-title {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-muted);
  letter-spacing: 0.5px;
}

.terminal-telemetry {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-bottom: 20px;
}

.telemetry-card {
  background: rgba(0, 0, 0, 0.4);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 12px 14px;
}

.telemetry-label {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-dim);
  text-transform: uppercase;
  margin-bottom: 4px;
}

.telemetry-val {
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 700;
  color: #ffffff;
}

.telemetry-val.purple { color: var(--uv-purple-light); }
.telemetry-val.gold { color: var(--pulse-gold-light); }
.telemetry-val.cyan { color: var(--quantum-cyan); }

/* 动态声波/示波器 */
.oscilloscope-box {
  background: #040507;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 12px;
  margin-bottom: 16px;
  position: relative;
}

.oscilloscope-canvas {
  width: 100%;
  height: 80px;
  display: block;
}

.oscilloscope-info {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-dim);
  margin-top: 6px;
}

/* ==========================================================================
   差异化交互组件 1: DPDK 用户态旁路 vs 传统 Linux 网络栈 仿真看板
   ========================================================================== */
.dpdk-benchmark-box {
  background: var(--bg-card);
  border: 1px solid var(--border-uv);
  border-radius: var(--radius-xl);
  padding: 32px;
  box-shadow: 0 15px 45px rgba(0, 0, 0, 0.5);
}

.dpdk-controls-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 28px;
  padding: 18px 22px;
  background: rgba(0, 0, 0, 0.4);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  flex-wrap: wrap;
}

.control-group {
  display: flex;
  align-items: center;
  gap: 14px;
}

.control-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-sub);
}

.pps-slider-wrap {
  display: flex;
  align-items: center;
  gap: 12px;
}

.pps-slider {
  -webkit-appearance: none;
  width: 180px;
  height: 6px;
  border-radius: 3px;
  background: rgba(255, 255, 255, 0.15);
  outline: none;
}

.pps-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--pulse-gold);
  cursor: pointer;
  box-shadow: 0 0 10px var(--pulse-gold-glow);
}

.pps-slider-val {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  color: var(--pulse-gold-light);
  min-width: 90px;
}

.btn-burst-group {
  display: flex;
  gap: 8px;
}

.btn-burst {
  padding: 6px 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  color: var(--text-sub);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s;
}

.btn-burst.active, .btn-burst:hover {
  background: var(--uv-subtle);
  border-color: var(--uv-purple);
  color: #ffffff;
}

.dpdk-comparison-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.stack-card {
  border-radius: var(--radius-lg);
  padding: 24px;
  position: relative;
  transition: transform 0.2s ease;
}

.stack-card.traditional {
  background: rgba(239, 68, 68, 0.03);
  border: 1px solid rgba(239, 68, 68, 0.25);
}

.stack-card.dpdk {
  background: rgba(168, 85, 247, 0.04);
  border: 1px solid var(--border-uv);
  box-shadow: 0 0 25px rgba(168, 85, 247, 0.12);
}

.stack-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.stack-title {
  font-size: 17px;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 10px;
}

.stack-badge {
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 3px 8px;
  border-radius: var(--radius-sm);
}

.stack-badge.red {
  background: rgba(239, 68, 68, 0.15);
  color: #fca5a5;
  border: 1px solid rgba(239, 68, 68, 0.3);
}

.stack-badge.green {
  background: rgba(16, 185, 129, 0.15);
  color: #6ee7b7;
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.metric-bar-group {
  margin-bottom: 18px;
}

.metric-bar-header {
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  margin-bottom: 6px;
  color: var(--text-sub);
}

.metric-bar-val {
  font-family: var(--font-mono);
  font-weight: 700;
}

.progress-track {
  height: 8px;
  background: rgba(255, 255, 255, 0.06);
  border-radius: 4px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  border-radius: 4px;
  transition: width 0.3s ease;
}

.progress-fill.red { background: linear-gradient(90deg, #f87171, #ef4444); }
.progress-fill.purple { background: linear-gradient(90deg, var(--uv-purple), var(--uv-purple-light)); }
.progress-fill.gold { background: linear-gradient(90deg, var(--pulse-gold), var(--pulse-gold-bright)); }
.progress-fill.cyan { background: linear-gradient(90deg, #00f5d4, #10b981); }

.stack-stat-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  padding-top: 16px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  margin-top: 16px;
}

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

.stat-cell-label {
  font-size: 11px;
  color: var(--text-dim);
  margin-bottom: 2px;
}

.stat-cell-val {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
}

/* ==========================================================================
   差异化交互组件 2: 全球特种 Anycast CN2-GIA/AS9929 骨干海缆故障自愈雷达
   ========================================================================== */
.radar-box {
  background: var(--bg-card);
  border: 1px solid var(--border-gold);
  border-radius: var(--radius-xl);
  padding: 32px;
  box-shadow: 0 15px 45px rgba(0, 0, 0, 0.5), 0 0 25px var(--pulse-gold-subtle);
}

.radar-header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
  flex-wrap: wrap;
  gap: 16px;
}

.radar-btn-group {
  display: flex;
  gap: 12px;
}

.radar-map-wrapper {
  position: relative;
  background: #040508;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-lg);
  padding: 20px;
  overflow: hidden;
  min-height: 380px;
}

.radar-canvas {
  width: 100%;
  height: 340px;
  display: block;
}

.radar-overlay-stats {
  position: absolute;
  top: 24px;
  left: 24px;
  background: rgba(11, 13, 19, 0.88);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 12px 18px;
  backdrop-filter: blur(8px);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
}

.radar-status-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 8px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 600;
}
.radar-status-pill.normal { background: rgba(16, 185, 129, 0.15); color: #34d399; }
.radar-status-pill.healing { background: rgba(245, 158, 11, 0.15); color: #fbbf24; }
.radar-status-pill.cut { background: rgba(239, 68, 68, 0.15); color: #f87171; }

.radar-nodes-legend {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 24px;
  margin-top: 20px;
  font-size: 13px;
  color: var(--text-sub);
}

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

.legend-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}
.legend-dot.gia { background: #00f5d4; box-shadow: 0 0 8px #00f5d4; }
.legend-dot.as9929 { background: var(--pulse-gold); box-shadow: 0 0 8px var(--pulse-gold); }
.legend-dot.cut { background: #ef4444; box-shadow: 0 0 8px #ef4444; }

/* ==========================================================================
   差异化交互组件 3: Kyber-1024 格密码学与 AI 算力长连接抗嗅探实测跑分
   ========================================================================== */
.pqc-bench-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 30px;
}

.pqc-card {
  background: var(--bg-card);
  border: 1px solid var(--border-uv);
  border-radius: var(--radius-xl);
  padding: 30px;
  box-shadow: 0 15px 45px rgba(0, 0, 0, 0.5);
}

.pqc-toggle-row {
  display: flex;
  gap: 12px;
  margin-bottom: 24px;
  padding: 6px;
  background: rgba(0, 0, 0, 0.5);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
}

.pqc-toggle-btn {
  flex: 1;
  padding: 10px;
  font-size: 13px;
  font-weight: 600;
  text-align: center;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-sub);
  border: none;
  cursor: pointer;
  transition: all 0.2s ease;
}

.pqc-toggle-btn.active {
  background: linear-gradient(135deg, var(--uv-purple), #7e22ce);
  color: #ffffff;
  box-shadow: 0 2px 10px var(--uv-glow);
}

.pqc-spec-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  margin-bottom: 24px;
}

.pqc-spec-table th, .pqc-spec-table td {
  padding: 12px 14px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  text-align: left;
}

.pqc-spec-table th {
  color: var(--text-dim);
  font-weight: 600;
  font-family: var(--font-mono);
  font-size: 11px;
}

.pqc-spec-table td {
  color: var(--text-sub);
}

.ai-stream-monitor {
  background: #040507;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 20px;
  font-family: var(--font-mono);
}

.stream-monitor-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.stream-flow-box {
  min-height: 140px;
  font-size: 12px;
  line-height: 1.6;
  color: #94a3b8;
  overflow: hidden;
}

.stream-packet {
  display: flex;
  gap: 10px;
  margin-bottom: 6px;
  animation: fadeIn 0.2s ease;
}

.packet-tag {
  color: var(--pulse-gold-light);
}

.packet-ok {
  color: var(--quantum-cyan);
}

/* ==========================================================================
   核心技术特征卡片矩阵
   ========================================================================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 32px 28px;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--uv-purple), var(--pulse-gold), transparent);
  opacity: 0;
  transition: opacity 0.3s;
}

.feature-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-uv);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.6), 0 0 20px var(--uv-subtle);
}

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

.feature-icon-box {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, rgba(168, 85, 247, 0.15), rgba(245, 158, 11, 0.15));
  border: 1px solid var(--border-uv);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--pulse-gold-light);
  margin-bottom: 22px;
}

.feature-title {
  font-size: 20px;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 12px;
}

.feature-desc {
  font-size: 14px;
  color: var(--text-sub);
  line-height: 1.7;
  margin-bottom: 20px;
}

.feature-tags-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.feature-chip {
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 4px 8px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 4px;
  color: var(--text-muted);
}

/* ==========================================================================
   价格方案卡片 (透明定价矩阵)
   ========================================================================== */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
  align-items: stretch;
}

.price-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 32px 24px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all 0.3s ease;
}

.price-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-light);
}

.price-card.featured {
  background: linear-gradient(180deg, rgba(168, 85, 247, 0.1) 0%, rgba(17, 20, 30, 0.95) 100%);
  border: 1.5px solid var(--uv-purple);
  box-shadow: 0 15px 45px rgba(0, 0, 0, 0.6), 0 0 35px var(--uv-glow);
}

.price-badge-top {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(90deg, var(--uv-purple), var(--pulse-gold));
  color: #ffffff;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.5px;
  padding: 4px 14px;
  border-radius: var(--radius-full);
  white-space: nowrap;
}

.plan-name {
  font-size: 18px;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 8px;
}

.plan-desc {
  font-size: 13px;
  color: var(--text-muted);
  min-height: 38px;
  margin-bottom: 20px;
}

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

.price-currency {
  font-size: 20px;
  font-weight: 600;
  color: var(--text-sub);
}

.price-number {
  font-size: 42px;
  font-weight: 800;
  color: #ffffff;
  letter-spacing: -1px;
  line-height: 1;
}

.price-period {
  font-size: 13px;
  color: var(--text-muted);
}

.plan-features-list {
  list-style: none;
  margin-bottom: 30px;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.plan-feature-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 13px;
  color: var(--text-sub);
  line-height: 1.5;
}

.plan-feature-item svg {
  color: var(--quantum-cyan);
  flex-shrink: 0;
  margin-top: 2px;
}

/* ==========================================================================
   FAQ 手风琴
   ========================================================================== */
.faq-wrap {
  max-width: 820px;
  margin: 0 auto;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  margin-bottom: 14px;
  overflow: hidden;
  transition: border-color 0.2s ease;
}

.faq-item:hover {
  border-color: var(--border-light);
}

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  background: transparent;
  border: none;
  color: #ffffff;
  font-size: 16px;
  font-weight: 600;
  text-align: left;
  cursor: pointer;
}

.faq-icon {
  width: 20px;
  height: 20px;
  color: var(--uv-purple-light);
  transition: transform 0.3s ease;
  flex-shrink: 0;
}

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

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s cubic-bezier(0.16, 1, 0.3, 1);
  padding: 0 24px;
  background: rgba(0, 0, 0, 0.2);
}

.faq-answer-inner {
  padding-bottom: 22px;
  padding-top: 4px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-sub);
}

/* ==========================================================================
   官方资讯公告中心 (真实分页器 + 展开收起 + 分类筛选)
   ========================================================================== */
.news-filter-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 40px;
}

.filter-btn {
  padding: 8px 18px;
  font-size: 13px;
  font-weight: 600;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
  color: var(--text-sub);
  cursor: pointer;
  transition: all 0.2s;
}

.filter-btn:hover, .filter-btn.active {
  background: var(--uv-purple);
  color: #ffffff;
  border-color: var(--uv-purple);
  box-shadow: 0 0 16px var(--uv-glow);
}

.news-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-bottom: 40px;
}

.news-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: border-color 0.25s, transform 0.25s;
}

.news-card:hover {
  border-color: var(--border-uv);
  transform: translateY(-2px);
}

.news-meta-row {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 12px;
  font-size: 12px;
  font-family: var(--font-mono);
}

.news-badge {
  padding: 3px 8px;
  border-radius: 4px;
  font-weight: 600;
}
.news-badge.pqc { background: var(--uv-subtle); color: var(--uv-purple-light); border: 1px solid var(--border-uv); }
.news-badge.cable { background: var(--pulse-gold-subtle); color: var(--pulse-gold-light); border: 1px solid var(--border-gold); }
.news-badge.perf { background: rgba(0, 245, 212, 0.1); color: var(--quantum-cyan); border: 1px solid rgba(0, 245, 212, 0.25); }

.news-date {
  color: var(--text-dim);
}

.news-title {
  font-size: 20px;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 12px;
  line-height: 1.4;
}

.news-excerpt {
  font-size: 14px;
  color: var(--text-sub);
  line-height: 1.7;
  margin-bottom: 16px;
}

.news-full-content {
  display: none;
  font-size: 14px;
  color: var(--text-sub);
  line-height: 1.8;
  padding-top: 16px;
  margin-top: 16px;
  border-top: 1px solid var(--border-subtle);
}

.news-full-content.show {
  display: block;
}

.news-full-content h4 {
  color: #ffffff;
  margin: 16px 0 8px 0;
  font-size: 16px;
}

.news-full-content ul {
  padding-left: 20px;
  margin-bottom: 12px;
}

.btn-toggle-news {
  background: transparent;
  border: none;
  color: var(--pulse-gold-light);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.btn-toggle-news:hover {
  text-decoration: underline;
}

/* 分页器 */
.pagination-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.page-btn {
  min-width: 38px;
  height: 38px;
  padding: 0 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-sub);
  font-family: var(--font-mono);
  font-size: 13px;
  cursor: pointer;
  transition: all 0.2s;
}

.page-btn:hover, .page-btn.active {
  background: var(--uv-purple);
  border-color: var(--uv-purple);
  color: #ffffff;
  box-shadow: 0 0 12px var(--uv-glow);
}

.page-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* ==========================================================================
   使用帮助文档 & 客户端配置区
   ========================================================================== */
.help-tabs-nav {
  display: flex;
  gap: 12px;
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: 32px;
  overflow-x: auto;
  padding-bottom: 4px;
}

.tab-nav-item {
  padding: 10px 18px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-muted);
  background: transparent;
  border: none;
  cursor: pointer;
  position: relative;
  white-space: nowrap;
  transition: color 0.2s;
}

.tab-nav-item:hover {
  color: #ffffff;
}

.tab-nav-item.active {
  color: var(--uv-purple-light);
}

.tab-nav-item.active::after {
  content: "";
  position: absolute;
  bottom: -5px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--uv-purple);
  box-shadow: 0 0 10px var(--uv-glow);
}

.help-panel {
  display: none;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 36px;
}

.help-panel.active {
  display: block;
}

.code-box {
  background: #040507;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  margin: 16px 0;
  position: relative;
  font-family: var(--font-mono);
  font-size: 13px;
  overflow-x: auto;
  color: #cbd5e1;
}

.btn-copy {
  position: absolute;
  top: 10px;
  right: 12px;
  padding: 4px 10px;
  font-size: 11px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: var(--text-sub);
  border-radius: 4px;
  cursor: pointer;
}

.btn-copy:hover {
  background: var(--uv-purple);
  color: #ffffff;
}

/* ==========================================================================
   Footer 页脚 (严格遵守：绝无 XML 网站地图 文本链接，Logo 仅为 CyberGhost)
   ========================================================================== */
.site-footer {
  background: #040507;
  border-top: 1px solid var(--border-subtle);
  padding-top: 60px;
  padding-bottom: 40px;
  font-size: 13px;
  color: var(--text-muted);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 48px;
}

.footer-brand-desc {
  line-height: 1.7;
  margin-top: 14px;
  max-width: 340px;
}

.footer-col-title {
  font-size: 14px;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 18px;
  letter-spacing: 0.5px;
}

.footer-links-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-link {
  color: var(--text-muted);
  transition: color 0.2s;
}

.footer-link:hover {
  color: #ffffff;
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 30px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  flex-wrap: wrap;
  gap: 16px;
}

.footer-copyright {
  font-size: 12px;
}

.footer-compliance-row {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 12px;
}

/* ==========================================================================
   响应式断点系统
   ========================================================================== */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .dpdk-comparison-grid {
    grid-template-columns: 1fr;
  }
  .pqc-bench-grid {
    grid-template-columns: 1fr;
  }
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: #090b10;
    border-bottom: 1px solid var(--border-uv);
    flex-direction: column;
    padding: 20px 24px;
    gap: 16px;
  }
  .nav-menu.show {
    display: flex;
  }
  .mobile-toggle {
    display: block;
  }
  .hero-title {
    font-size: 32px;
  }
  .section-title {
    font-size: 28px;
  }
  .features-grid {
    grid-template-columns: 1fr;
  }
  .pricing-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .dpdk-controls-row {
    flex-direction: column;
    align-items: flex-start;
  }
}