:root {
  /* Brand colors */
  --primary-void-purple: #1A0B2E;
  --primary-shadow-purple: #2E1A47;
  --primary-cyber-purple: #7B2CBF;
  --primary-glow-purple: #A855F7;

  --accent-electric-cyan: #00F5FF;
  --accent-neon-cyan: #00D9FF;
  --accent-ice-cyan: #7DD3FC;

  --freedom-neon-green: #39FF14;
  --freedom-matrix-green: #00FF41;

  --neutral-void: #000000;
  --neutral-abyss: #0D0D0D;
  --neutral-shadow: #1A1A2E;
  --neutral-fog: #2D2D3A;
  --neutral-silver: #4A4A5C;
  --neutral-ghost: #8B8B99;
  --neutral-light: #E8E8ED;
  --neutral-white: #FFFFFF;

  /* Gradients */
  --gradient-privacy: linear-gradient(135deg, #1A0B2E 0%, #7B2CBF 50%, #A855F7 100%);
  --gradient-cyber: linear-gradient(135deg, #0D0D0D 0%, #00F5FF 50%, #7DD3FC 100%);
  --gradient-void: linear-gradient(180deg, #000000 0%, #1A0B2E 100%);

  /* Typography */
  --font-body: 'Noto Sans SC', system-ui, -apple-system, Segoe UI, Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'JetBrains Mono', 'Sarasa Mono SC', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --font-display: 'Orbitron', sans-serif;

  --container-width: 1200px;
  --radius: 12px;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--neutral-white);
  background: var(--neutral-abyss);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(13, 13, 13, 0.7);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--neutral-white);
  text-decoration: none;
}
.brand img { height: 32px; width: 32px; display: block; }
.brand-icon { color: var(--primary-cyber-purple); filter: drop-shadow(0 0 8px rgba(123,44,191,0.6)); }
.brand-text { font-family: var(--font-display); font-weight: 700; letter-spacing: 0.08em; }

.site-nav { display: flex; gap: 20px; align-items: center; }
.site-nav a { color: var(--neutral-white); text-decoration: none; opacity: 0.9; }
.site-nav a:hover { color: var(--accent-electric-cyan); }

.menu-toggle { display: none; background: transparent; color: var(--neutral-white); border: 0; font-size: 22px; }

/* Buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; padding: 10px 16px; border-radius: 8px; border: 1px solid transparent; text-decoration: none; font-family: var(--font-mono); }
.btn.primary { background: var(--primary-cyber-purple); border-color: var(--primary-glow-purple); color: #fff; box-shadow: 0 0 16px rgba(123, 44, 191, 0.45); }
.btn.primary:hover { background: var(--primary-glow-purple); }
.btn.ghost { background: transparent; border-color: rgba(255,255,255,0.2); color: var(--neutral-white); }
.btn.ghost:hover { border-color: var(--accent-electric-cyan); color: var(--accent-electric-cyan); }
.btn.large { padding: 14px 20px; font-size: 18px; }

/* Hero */
.hero { position: relative; padding: 120px 0 80px; overflow: hidden; }
.hero .title { font-family: var(--font-display); font-size: clamp(32px, 6vw, 72px); line-height: 1.05; margin: 0 0 16px; letter-spacing: 0.02em; }
.hero .subtitle { font-family: var(--font-mono); font-size: clamp(14px, 2vw, 18px); opacity: 0.9; margin: 0 0 28px; }
.hero .actions { display: flex; gap: 12px; }
.hero-bg { position: absolute; inset: 0; background: var(--gradient-privacy); opacity: 0.25; filter: blur(80px); z-index: -1; }

/* Features */
.features { padding: 64px 0; }
.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.card { background: var(--neutral-shadow); border: 1px solid var(--neutral-fog); border-radius: var(--radius); padding: 20px; transition: border-color .2s, box-shadow .2s; }
.card:hover { border-color: var(--accent-electric-cyan); box-shadow: 0 0 15px rgba(0,245,255,0.25); }
.card h3 { margin: 0 0 8px; font-family: var(--font-display); }
.card p { margin: 0; opacity: 0.9; }

/* CTA */
.cta { padding: 80px 0; background: var(--gradient-cyber); border-top: 1px solid rgba(255,255,255,0.08); border-bottom: 1px solid rgba(255,255,255,0.08); }
.cta h2 { margin: 0 0 8px; font-family: var(--font-display); }
.cta p { margin: 0 0 20px; font-family: var(--font-mono); }

/* Footer */
.site-footer { padding: 32px 0; border-top: 1px solid rgba(255,255,255,0.06); background: #0b0b0b; }
.site-footer p { margin: 0; color: var(--neutral-ghost); font-family: var(--font-mono); font-size: 14px; }

/* Responsive */
@media (max-width: 960px) {
  .grid { grid-template-columns: 1fr; }
  .menu-toggle { display: inline-flex; }
  .site-nav { 
    position: absolute; 
    right: 20px; 
    top: 64px; 
    background: rgba(13,13,13,0.95); 
    border: 1px solid rgba(255,255,255,0.08); 
    border-radius: 10px; 
    padding: 12px; 
    flex-direction: column; 
    gap: 12px; 
    display: none; 
    backdrop-filter: blur(10px);
    box-shadow: 0 4px 20px rgba(0,0,0,0.3);
  }
  .site-nav.open { display: flex; }
}