/* ========================================================
   Proton VPN Labs - Official Brand Design System
   Color Universe: Proton Purple (#6d4aff) & Proton VPN Green (#00f0c3 / #00d287)
   Jurisdiction: Switzerland · Open Source · Strict Zero Logs
   ======================================================== */

:root {
  /* Brand Primary Colors */
  --color-proton-purple: #6d4aff;
  --color-proton-purple-light: #8f6fff;
  --color-proton-purple-dark: #4928d4;
  --color-proton-purple-glow: rgba(109, 74, 255, 0.4);
  
  /* Proton VPN Accent Green */
  --color-vpn-green: #00f0c3;
  --color-vpn-green-alt: #00d287;
  --color-vpn-green-glow: rgba(0, 240, 195, 0.35);
  --color-vpn-cyan: #8effee;

  /* Functional Status Colors (Proton Server Load Specs) */
  --color-load-green: #00d287;   /* 1-49% */
  --color-load-yellow: #ffb703;  /* 50-89% */
  --color-load-red: #ff4d6d;     /* 90-100% */
  
  /* Dark Cosmic Theme Backgrounds */
  --bg-deepest: #070514;
  --bg-base: #0c0920;
  --bg-surface: #141033;
  --bg-card: rgba(23, 18, 56, 0.72);
  --bg-card-hover: rgba(33, 27, 77, 0.85);
  --bg-card-active: rgba(43, 35, 99, 0.9);
  
  /* Borders & Dividers */
  --border-subtle: rgba(109, 74, 255, 0.18);
  --border-bright: rgba(109, 74, 255, 0.4);
  --border-green: rgba(0, 240, 195, 0.35);

  /* Typography Colors */
  --text-primary: #ffffff;
  --text-secondary: #c9c4eb;
  --text-muted: #8d87bc;
  --text-dim: #60598f;

  /* Fonts */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Courier New', monospace;

  /* Radii */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 9999px;

  /* Shadows & Glow */
  --shadow-card: 0 12px 32px -4px rgba(0, 0, 0, 0.5), 0 4px 12px rgba(109, 74, 255, 0.08);
  --shadow-glow-purple: 0 0 40px -10px rgba(109, 74, 255, 0.55);
  --shadow-glow-green: 0 0 35px -8px rgba(0, 240, 195, 0.45);
  --transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  background-color: var(--bg-deepest);
  color: var(--text-primary);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  position: relative;
  overflow-x: hidden;
  min-height: 100vh;
  background: radial-gradient(circle at 50% 0%, #1c1547 0%, #0c0920 50%, #070514 100%);
  background-attachment: fixed;
  line-height: 1.6;
}

/* Interactive Canvas Background */
#cyber-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
  opacity: 0.6;
}

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

/* Typography Helpers */
h1, h2, h3, h4 {
  font-weight: 700;
  line-height: 1.25;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.gradient-text-purple {
  background: linear-gradient(135deg, #ffffff 20%, #c9c7ff 60%, #8f6fff 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.gradient-text-green {
  background: linear-gradient(135deg, #00f0c3 0%, #8effee 50%, #6d4aff 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Notification / Announcement Banner */
.announcement-bar {
  background: linear-gradient(90deg, rgba(109, 74, 255, 0.25) 0%, rgba(0, 240, 195, 0.2) 50%, rgba(109, 74, 255, 0.25) 100%);
  border-bottom: 1px solid var(--border-subtle);
  backdrop-filter: blur(12px);
  padding: 10px 16px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  text-align: center;
  position: relative;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
}

.announcement-badge {
  background: var(--color-proton-purple);
  color: #fff;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.announcement-link {
  color: var(--color-vpn-green);
  text-decoration: none;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.announcement-link:hover {
  text-decoration: underline;
}

/* Header & Nav */
.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  background: rgba(12, 9, 32, 0.82);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--border-subtle);
  transition: var(--transition);
}

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

.brand-wrapper {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.brand-logo-svg {
  width: 36px;
  height: 36px;
  filter: drop-shadow(0 0 10px rgba(0, 240, 195, 0.35));
}

.brand-text-col {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-size: 1.15rem;
  font-weight: 800;
  color: #fff;
  display: flex;
  align-items: center;
  gap: 6px;
  letter-spacing: -0.01em;
}

.brand-tag {
  font-size: 0.65rem;
  font-weight: 700;
  padding: 1px 6px;
  border-radius: 4px;
  background: linear-gradient(135deg, var(--color-proton-purple), #9e85ff);
  color: #fff;
  letter-spacing: 0.05em;
}

.brand-sub {
  font-size: 0.7rem;
  color: var(--text-muted);
  letter-spacing: 0.02em;
}

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

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 500;
  transition: var(--transition);
  padding: 6px 10px;
  border-radius: var(--radius-sm);
}

.nav-link:hover {
  color: #fff;
  background: rgba(109, 74, 255, 0.12);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

.network-pill {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  color: var(--color-vpn-green);
  background: rgba(0, 240, 195, 0.08);
  border: 1px solid rgba(0, 240, 195, 0.25);
  padding: 5px 12px;
  border-radius: var(--radius-full);
}

.pulse-dot {
  width: 8px;
  height: 8px;
  background: var(--color-vpn-green);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--color-vpn-green);
  animation: pulseGreen 2s infinite ease-in-out;
}

@keyframes pulseGreen {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.4); opacity: 0.6; }
}

/* Button Components */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.92rem;
  padding: 10px 20px;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  border: none;
  outline: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-proton-purple) 0%, #8561ff 100%);
  color: #fff;
  box-shadow: 0 4px 18px var(--color-proton-purple-glow);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(109, 74, 255, 0.65);
}

.btn-green {
  background: linear-gradient(135deg, #00d287 0%, #00f0c3 100%);
  color: #0c0920;
  font-weight: 700;
  box-shadow: 0 4px 20px var(--color-vpn-green-glow);
}
.btn-green:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 28px rgba(0, 240, 195, 0.6);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.06);
  color: #fff;
  border: 1px solid var(--border-subtle);
  backdrop-filter: blur(8px);
}
.btn-secondary:hover {
  background: rgba(109, 74, 255, 0.16);
  border-color: var(--border-bright);
}

.btn-sm {
  padding: 7px 14px;
  font-size: 0.82rem;
}

.btn-lg {
  padding: 14px 28px;
  font-size: 1.02rem;
}

/* Mobile Menu Toggle */
.mobile-toggle {
  display: none;
  background: transparent;
  border: none;
  color: #fff;
  font-size: 1.5rem;
  cursor: pointer;
}

/* ========================================================
   Hero Section
   ======================================================== */
.hero-section {
  padding: 70px 0 90px;
  position: relative;
  overflow: hidden;
}

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

.hero-pill-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--color-vpn-green);
  background: rgba(0, 240, 195, 0.08);
  border: 1px solid rgba(0, 240, 195, 0.28);
  padding: 6px 14px;
  border-radius: var(--radius-full);
  margin-bottom: 24px;
}

.hero-title {
  font-size: 3.4rem;
  line-height: 1.15;
  margin-bottom: 22px;
  letter-spacing: -0.03em;
}

.hero-desc {
  font-size: 1.15rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 34px;
  max-width: 600px;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 42px;
  flex-wrap: wrap;
}

.hero-metrics {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  padding-top: 24px;
  border-top: 1px solid var(--border-subtle);
}

.metric-item {
  display: flex;
  flex-direction: column;
}

.metric-value {
  font-size: 1.6rem;
  font-weight: 800;
  color: #fff;
  font-family: var(--font-mono);
}

.metric-value span {
  color: var(--color-vpn-green);
}

.metric-label {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 2px;
}

/* ========================================================
   Interactive Terminal & Shield Simulator (Hero Card)
   ======================================================== */
.terminal-card {
  background: var(--bg-card);
  border: 1px solid var(--border-bright);
  border-radius: var(--radius-xl);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: var(--shadow-card), var(--shadow-glow-purple);
  overflow: hidden;
  position: relative;
  transition: var(--transition);
}

.terminal-header {
  background: rgba(14, 11, 38, 0.95);
  border-bottom: 1px solid var(--border-subtle);
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.terminal-dots {
  display: flex;
  align-items: center;
  gap: 6px;
}
.t-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}
.t-dot.red { background: #ff5f56; }
.t-dot.yellow { background: #ffbd2e; }
.t-dot.green { background: #27c93f; }

.terminal-title {
  font-size: 0.82rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
}

.terminal-body {
  padding: 24px;
}

.shield-status-box {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-radius: var(--radius-md);
  margin-bottom: 20px;
  transition: var(--transition);
}

.shield-status-box.protected {
  background: linear-gradient(135deg, rgba(0, 240, 195, 0.12), rgba(109, 74, 255, 0.1));
  border: 1px solid var(--border-green);
}

.shield-status-box.unprotected {
  background: rgba(255, 77, 109, 0.1);
  border: 1px solid rgba(255, 77, 109, 0.35);
}

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

.shield-icon-circle {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
}
.protected .shield-icon-circle {
  background: rgba(0, 240, 195, 0.2);
  color: var(--color-vpn-green);
  box-shadow: 0 0 16px var(--color-vpn-green-glow);
}
.unprotected .shield-icon-circle {
  background: rgba(255, 77, 109, 0.2);
  color: #ff4d6d;
}

.shield-title {
  font-size: 0.95rem;
  font-weight: 700;
}
.protected .shield-title { color: var(--color-vpn-green); }
.unprotected .shield-title { color: #ff4d6d; }

.shield-sub {
  font-size: 0.76rem;
  color: var(--text-muted);
}

.switch-wrapper {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 4px;
}

.toggle-switch {
  position: relative;
  display: inline-block;
  width: 52px;
  height: 28px;
}
.toggle-switch input {
  opacity: 0;
  width: 0;
  height: 0;
}
.toggle-slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: #3b3563;
  transition: 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  border-radius: 34px;
}
.toggle-slider:before {
  position: absolute;
  content: "";
  height: 22px;
  width: 22px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  transition: 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  border-radius: 50%;
}
input:checked + .toggle-slider {
  background-color: var(--color-vpn-green-alt);
  box-shadow: 0 0 12px var(--color-vpn-green-glow);
}
input:checked + .toggle-slider:before {
  transform: translateX(24px);
}

.terminal-data-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 20px;
}

.t-cell {
  background: rgba(14, 11, 38, 0.6);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
}
.t-label {
  font-size: 0.72rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 4px;
}
.t-val {
  font-size: 0.88rem;
  font-family: var(--font-mono);
  font-weight: 600;
  color: #fff;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.t-val.green { color: var(--color-vpn-green); }
.t-val.danger { color: #ff5f56; }

/* Real-time Crypto Wave */
.crypto-stream-box {
  background: rgba(10, 8, 28, 0.8);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 12px 16px;
  position: relative;
}
.stream-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-bottom: 8px;
  font-family: var(--font-mono);
}
.stream-canvas {
  width: 100%;
  height: 48px;
  display: block;
}

/* ========================================================
   Section Standards
   ======================================================== */
.section {
  padding: 90px 0;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 54px;
}

.section-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-proton-purple-light);
  background: rgba(109, 74, 255, 0.1);
  border: 1px solid var(--border-bright);
  padding: 5px 14px;
  border-radius: var(--radius-full);
  margin-bottom: 16px;
}

.section-title {
  font-size: 2.4rem;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

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

/* ========================================================
   Interactive Diagnostic Suite (实测体检套件)
   ======================================================== */
.diagnostic-container {
  background: var(--bg-card);
  border: 1px solid var(--border-bright);
  border-radius: var(--radius-xl);
  backdrop-filter: blur(24px);
  padding: 36px;
  box-shadow: var(--shadow-card);
}

.diag-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 24px;
  margin-bottom: 28px;
  flex-wrap: wrap;
  gap: 16px;
}

.diag-info-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
}
.diag-info-sub {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.diag-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  margin-bottom: 28px;
}

.diag-card {
  background: rgba(18, 14, 46, 0.8);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 20px;
  position: relative;
  overflow: hidden;
  transition: var(--transition);
}
.diag-card:hover {
  border-color: var(--border-bright);
  transform: translateY(-2px);
}

.diag-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

.diag-card-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: rgba(109, 74, 255, 0.18);
  color: var(--color-vpn-green);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
}

.diag-status-badge {
  font-size: 0.72rem;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: var(--radius-full);
}
.badge-safe {
  background: rgba(0, 240, 195, 0.15);
  color: var(--color-vpn-green);
  border: 1px solid rgba(0, 240, 195, 0.3);
}
.badge-warning {
  background: rgba(255, 183, 3, 0.15);
  color: var(--color-load-yellow);
  border: 1px solid rgba(255, 183, 3, 0.3);
}
.badge-danger {
  background: rgba(255, 77, 109, 0.15);
  color: var(--color-load-red);
  border: 1px solid rgba(255, 77, 109, 0.3);
}

.diag-card-name {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 4px;
}

.diag-card-value {
  font-size: 1.05rem;
  font-family: var(--font-mono);
  font-weight: 700;
  color: #fff;
  margin-bottom: 8px;
  word-break: break-all;
}

.diag-card-detail {
  font-size: 0.75rem;
  color: var(--text-muted);
  line-height: 1.4;
}

/* Comparison Bar */
.leak-comparison-box {
  background: linear-gradient(135deg, rgba(16, 12, 42, 0.95), rgba(26, 19, 64, 0.95));
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 24px;
}

.comp-col {
  padding: 16px;
  border-radius: var(--radius-md);
}
.comp-col.exposed {
  background: rgba(255, 77, 109, 0.08);
  border: 1px solid rgba(255, 77, 109, 0.25);
}
.comp-col.protected-col {
  background: rgba(0, 240, 195, 0.08);
  border: 1px solid rgba(0, 240, 195, 0.3);
}

.comp-badge {
  font-size: 0.72rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 4px;
  display: inline-block;
  margin-bottom: 10px;
}
.exposed .comp-badge { background: #ff4d6d; color: #fff; }
.protected-col .comp-badge { background: var(--color-vpn-green); color: #0c0920; }

.comp-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 12px;
}

.comp-list {
  list-style: none;
  font-size: 0.82rem;
  color: var(--text-secondary);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.comp-list li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.comp-divider {
  display: flex;
  flex-direction: column;
  align-items: center;
  color: var(--text-muted);
  font-size: 0.85rem;
  font-weight: 700;
}
.comp-divider-arrow {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--color-proton-purple);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 6px;
  box-shadow: 0 0 15px var(--color-proton-purple-glow);
}

/* ========================================================
   4 Frontier Research Projects (核心前沿实验)
   ======================================================== */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  backdrop-filter: blur(16px);
  padding: 32px;
  position: relative;
  overflow: hidden;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

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

.project-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-proton-purple), var(--color-vpn-green));
  opacity: 0;
  transition: var(--transition);
}
.project-card:hover::before {
  opacity: 1;
}

.proj-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.proj-tag {
  font-size: 0.72rem;
  font-family: var(--font-mono);
  font-weight: 700;
  padding: 4px 10px;
  border-radius: var(--radius-full);
}
.proj-tag.beta {
  background: rgba(0, 240, 195, 0.12);
  color: var(--color-vpn-green);
  border: 1px solid rgba(0, 240, 195, 0.3);
}
.proj-tag.alpha {
  background: rgba(109, 74, 255, 0.16);
  color: var(--color-proton-purple-light);
  border: 1px solid var(--border-bright);
}

.proj-id {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  color: var(--text-dim);
}

.proj-title {
  font-size: 1.45rem;
  margin-bottom: 12px;
  color: #fff;
}

.proj-desc {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 20px;
}

/* Feature Spec Pill List */
.proj-specs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
}

.spec-pill {
  font-size: 0.75rem;
  color: var(--text-secondary);
  background: rgba(14, 11, 38, 0.7);
  border: 1px solid var(--border-subtle);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

/* Visual Micro-Demo inside Card */
.proj-preview-box {
  background: rgba(10, 8, 25, 0.75);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 16px;
  margin-top: auto;
  font-size: 0.78rem;
  font-family: var(--font-mono);
}

.preview-row {
  display: flex;
  justify-content: space-between;
  margin-bottom: 6px;
}
.preview-row:last-child {
  margin-bottom: 0;
}
.preview-k { color: var(--text-muted); }
.preview-v { color: var(--color-vpn-green); font-weight: 600; }

/* ========================================================
   Protocol Performance Matrix & Speed Benchmark
   ======================================================== */
.matrix-wrapper {
  background: var(--bg-card);
  border: 1px solid var(--border-bright);
  border-radius: var(--radius-xl);
  backdrop-filter: blur(20px);
  padding: 36px;
  box-shadow: var(--shadow-card);
}

.protocol-table-container {
  overflow-x: auto;
  margin-bottom: 40px;
}

.protocol-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.9rem;
}

.protocol-table th {
  padding: 14px 18px;
  background: rgba(14, 11, 38, 0.9);
  color: var(--text-muted);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 1px solid var(--border-subtle);
}

.protocol-table td {
  padding: 18px;
  border-bottom: 1px solid rgba(109, 74, 255, 0.1);
  color: var(--text-secondary);
}

.protocol-table tr:hover td {
  background: rgba(109, 74, 255, 0.08);
}

.proto-badge {
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: #fff;
}
.proto-tag-highlight {
  font-size: 0.68rem;
  background: var(--color-proton-purple);
  color: #fff;
  padding: 2px 6px;
  border-radius: 4px;
}

.bar-meter {
  width: 100%;
  max-width: 110px;
  height: 8px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-full);
  overflow: hidden;
  display: inline-block;
  vertical-align: middle;
  margin-right: 8px;
}
.bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-proton-purple), var(--color-vpn-green));
  border-radius: var(--radius-full);
}

/* Benchmark Simulator Tool */
.benchmark-runner {
  background: rgba(12, 9, 32, 0.9);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px;
}

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

.protocol-selector-tabs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.tab-btn {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  padding: 8px 16px;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}
.tab-btn.active, .tab-btn:hover {
  background: var(--color-proton-purple);
  color: #fff;
  border-color: var(--color-proton-purple-light);
  box-shadow: 0 0 14px var(--color-proton-purple-glow);
}

.benchmark-results-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-bottom: 20px;
}

.bench-card {
  background: rgba(18, 14, 46, 0.7);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 16px;
  text-align: center;
}

.bench-lbl {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  margin-bottom: 6px;
}

.bench-num {
  font-size: 1.8rem;
  font-family: var(--font-mono);
  font-weight: 800;
  color: var(--color-vpn-green);
}

.bench-unit {
  font-size: 0.8rem;
  color: var(--text-secondary);
  font-weight: 500;
}

/* ========================================================
   Global Beta Server Network & Live Telemetry
   ======================================================== */
.servers-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.server-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 22px;
  position: relative;
  transition: var(--transition);
}
.server-card:hover {
  border-color: var(--border-bright);
  transform: translateY(-3px);
  box-shadow: var(--shadow-card);
}

.server-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

.server-flag-city {
  display: flex;
  align-items: center;
  gap: 10px;
}

.server-flag {
  font-size: 1.5rem;
}

.server-name {
  font-size: 1rem;
  font-weight: 700;
  color: #fff;
}
.server-type {
  font-size: 0.72rem;
  color: var(--color-vpn-green);
  font-family: var(--font-mono);
}

.server-load-badge {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  font-weight: 700;
  padding: 3px 8px;
  border-radius: var(--radius-full);
}
.load-low {
  background: rgba(0, 210, 135, 0.15);
  color: var(--color-load-green);
  border: 1px solid rgba(0, 210, 135, 0.35);
}
.load-med {
  background: rgba(255, 183, 3, 0.15);
  color: var(--color-load-yellow);
  border: 1px solid rgba(255, 183, 3, 0.35);
}
.load-high {
  background: rgba(255, 77, 109, 0.15);
  color: var(--color-load-red);
  border: 1px solid rgba(255, 77, 109, 0.35);
}

.server-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--border-subtle);
}

.s-stat-lbl {
  font-size: 0.7rem;
  color: var(--text-muted);
}
.s-stat-val {
  font-size: 0.88rem;
  font-family: var(--font-mono);
  font-weight: 600;
  color: #fff;
}

/* ========================================================
   The Swiss Fortress & Transparency
   ======================================================== */
.swiss-section {
  background: linear-gradient(180deg, rgba(16, 12, 42, 0.6) 0%, rgba(9, 7, 26, 0.9) 100%);
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

.swiss-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}

.swiss-badge-card {
  background: var(--bg-card);
  border: 1px solid var(--border-bright);
  border-radius: var(--radius-xl);
  padding: 36px;
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.audit-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 16px;
  background: rgba(14, 11, 38, 0.6);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
}

.audit-icon {
  font-size: 1.5rem;
  color: var(--color-vpn-green);
}

.audit-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 2px;
}

.audit-desc {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.hash-pill {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--color-vpn-green);
  background: rgba(0, 240, 195, 0.08);
  padding: 2px 6px;
  border-radius: 4px;
  display: inline-block;
  margin-top: 6px;
  word-break: break-all;
}

/* ========================================================
   Early Access Application Form (内测资格申请)
   ======================================================== */
.signup-box {
  background: linear-gradient(135deg, rgba(23, 18, 56, 0.9), rgba(14, 11, 38, 0.95));
  border: 1px solid var(--border-bright);
  border-radius: var(--radius-xl);
  padding: 48px;
  max-width: 840px;
  margin: 0 auto;
  box-shadow: var(--shadow-card), var(--shadow-glow-purple);
  position: relative;
  overflow: hidden;
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 20px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.form-group.full-width {
  grid-column: 1 / -1;
}

.form-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.form-input, .form-select {
  background: rgba(10, 8, 26, 0.85);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  font-size: 0.92rem;
  color: #fff;
  outline: none;
  font-family: var(--font-sans);
  transition: var(--transition);
}

.form-input:focus, .form-select:focus {
  border-color: var(--color-vpn-green);
  box-shadow: 0 0 12px var(--color-vpn-green-glow);
}

.checkbox-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.chip-label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  padding: 8px 14px;
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition);
}
.chip-label input {
  display: none;
}
.chip-label:has(input:checked) {
  background: rgba(0, 240, 195, 0.15);
  border-color: var(--color-vpn-green);
  color: #fff;
}

/* ========================================================
   Interactive Modal for Beta Token
   ======================================================== */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(6, 4, 18, 0.85);
  backdrop-filter: blur(14px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.modal-content {
  background: var(--bg-surface);
  border: 1px solid var(--color-vpn-green);
  border-radius: var(--radius-xl);
  padding: 36px;
  max-width: 580px;
  width: 100%;
  box-shadow: var(--shadow-card), var(--shadow-glow-green);
  transform: scale(0.95);
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
}

.modal-overlay.active .modal-content {
  transform: scale(1);
}

.modal-close {
  position: absolute;
  top: 18px;
  right: 18px;
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 1.5rem;
  cursor: pointer;
}
.modal-close:hover {
  color: #fff;
}

.token-box {
  background: rgba(10, 8, 25, 0.95);
  border: 1px dashed var(--border-green);
  border-radius: var(--radius-md);
  padding: 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin: 20px 0;
}
.token-str {
  font-family: var(--font-mono);
  font-size: 1.15rem;
  color: var(--color-vpn-green);
  font-weight: 700;
}

/* ========================================================
   FAQ Accordion
   ======================================================== */
.faq-list {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition);
}
.faq-item:hover {
  border-color: var(--border-bright);
}

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

.faq-icon {
  font-size: 1.2rem;
  color: var(--color-vpn-green);
  transition: transform 0.3s ease;
}
.faq-item.open .faq-icon {
  transform: rotate(180deg);
}

.faq-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  padding: 0 24px;
  color: var(--text-secondary);
  font-size: 0.92rem;
  line-height: 1.7;
}

.faq-item.open .faq-body {
  max-height: 250px;
  padding-bottom: 20px;
}

/* ========================================================
   Footer
   ======================================================== */
.site-footer {
  background: var(--bg-deepest);
  border-top: 1px solid var(--border-subtle);
  padding: 64px 0 32px;
  color: var(--text-muted);
  font-size: 0.88rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr repeat(3, 1fr);
  gap: 40px;
  margin-bottom: 48px;
}

.footer-col-title {
  font-size: 0.85rem;
  font-weight: 700;
  color: #fff;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 16px;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.footer-links a {
  color: var(--text-muted);
  text-decoration: none;
  transition: var(--transition);
}
.footer-links a:hover {
  color: var(--color-vpn-green);
}

.footer-bottom {
  border-top: 1px solid rgba(109, 74, 255, 0.12);
  padding-top: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.78rem;
  flex-wrap: wrap;
  gap: 16px;
}

.swiss-flag-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: #fff;
  font-weight: 600;
}
.swiss-cross {
  width: 16px;
  height: 16px;
  background: #f00;
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-weight: 900;
  border-radius: 3px;
}

/* ========================================================
   Pricing & Plans Section
   ======================================================== */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  backdrop-filter: blur(20px);
  padding: 36px 30px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: var(--transition);
}

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

.pricing-card.popular {
  background: linear-gradient(180deg, rgba(32, 23, 77, 0.85) 0%, rgba(18, 14, 46, 0.95) 100%);
  border: 2px solid var(--color-vpn-green);
  box-shadow: var(--shadow-card), var(--shadow-glow-green);
  transform: scale(1.03);
}

.pricing-card.popular:hover {
  transform: scale(1.03) translateY(-5px);
}

.popular-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, #00d287, #00f0c3);
  color: #0c0920;
  font-size: 0.72rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 4px 14px;
  border-radius: var(--radius-full);
  box-shadow: 0 4px 12px var(--color-vpn-green-glow);
}

.pricing-plan-name {
  font-size: 1.35rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 6px;
}

.pricing-plan-sub {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 22px;
  min-height: 40px;
}

.pricing-price-box {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin-bottom: 8px;
}

.price-currency {
  font-size: 1.4rem;
  font-weight: 700;
  color: #fff;
}

.price-amount {
  font-size: 2.8rem;
  font-weight: 900;
  font-family: var(--font-mono);
  color: #fff;
  line-height: 1;
}

.popular .price-amount {
  color: var(--color-vpn-green);
}

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

.pricing-save-tag {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--color-vpn-green);
  background: rgba(0, 240, 195, 0.1);
  border: 1px solid rgba(0, 240, 195, 0.3);
  padding: 3px 10px;
  border-radius: var(--radius-full);
  margin-bottom: 24px;
}

.pricing-features-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 32px;
  font-size: 0.88rem;
  color: var(--text-secondary);
  flex-grow: 1;
}

.pricing-features-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  line-height: 1.4;
}

.pricing-check {
  color: var(--color-vpn-green);
  font-weight: 800;
  font-size: 0.95rem;
  flex-shrink: 0;
}

.pricing-cta {
  width: 100%;
  margin-top: auto;
}

/* ========================================================
   Responsive Media Queries
   ======================================================== */
@media (max-width: 1024px) {
  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 520px;
    margin: 0 auto;
  }
  .pricing-card.popular {
    transform: scale(1);
  }
  .pricing-card.popular:hover {
    transform: translateY(-5px);
  }
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .hero-title {
    font-size: 2.8rem;
  }
  .diag-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .projects-grid {
    grid-template-columns: 1fr;
  }
  .servers-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .swiss-grid {
    grid-template-columns: 1fr;
  }
  .benchmark-results-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  .mobile-toggle {
    display: block;
  }
  .hero-title {
    font-size: 2.2rem;
  }
  .hero-metrics {
    grid-template-columns: repeat(2, 1fr);
  }
  .leak-comparison-box {
    grid-template-columns: 1fr;
  }
  .servers-grid {
    grid-template-columns: 1fr;
  }
  .form-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
  .diag-grid {
    grid-template-columns: 1fr;
  }
}