:root {
  --bg-primary: #0F1E1F;
  --bg-secondary: #1D3234;
  --bg-tertiary: #243D3F;
  --text-primary: #FFFFFF;
  --text-secondary: #A5A5A5;
  --border-light: rgba(255,255,255,0.12);

  --accent-blue: #22D3EE;
  --accent-cyan: #06B6D4;
  --accent-purple: #8B5CF6;
  --accent-glow: rgba(34,211,238,0.3);

  --font-sans: 'Montserrat', system-ui, sans-serif;
  --font-display: 'Montserrat', system-ui, sans-serif;

  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4.5rem;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 22px;

  --transition-fast: 0.2s ease;
  --transition-normal: 0.35s ease;

  --glass-border: 1px solid rgba(255,255,255,0.12);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  min-height: 100%;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
}

.container {
  width: min(1200px, 92vw);
  margin: 0 auto;
}

.mt-3xl { margin-top: var(--spacing-3xl); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-xl { margin-bottom: var(--spacing-xl); }
.mb-2xl { margin-bottom: var(--spacing-2xl); }
.mb-3xl { margin-bottom: var(--spacing-3xl); }

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

.gradient-text {
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.glass-card {
  background: color-mix(in srgb, var(--bg-secondary) 86%, transparent);
  border: var(--glass-border);
  border-radius: var(--radius-lg);
  box-shadow: 0 18px 45px rgba(0,0,0,0.28);
}

.button-primary {
  border: none;
  border-radius: 10px;
  padding: 0.82rem 1.35rem;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 0.95rem;
  color: #0F1E1F;
  cursor: pointer;
}

.mesh-bg {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -1;
}

.mesh-blob {
  position: absolute;
  filter: blur(80px);
  border-radius: 999px;
}

.main-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(15,30,31,0.92);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.nav-container {
  width: min(1300px, 95vw);
  margin: 0 auto;
  min-height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.nav-logo {
  color: #FFFFFF;
  font-weight: 800;
  text-decoration: none;
  letter-spacing: -0.02em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.86rem;
  padding: 0.4rem 0.65rem;
  border-radius: 8px;
  border: 1px solid transparent;
}

.nav-link:hover,
.nav-link.active {
  color: #FFFFFF;
  border-color: rgba(255,255,255,0.22);
  background: rgba(255,255,255,0.05);
}

.theme-toggle-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 8px;
  border: 1px solid rgba(255,255,255,0.2);
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
}

@media (max-width: 900px) {
  .nav-container {
    align-items: flex-start;
    flex-direction: column;
    padding: 0.7rem 0;
  }
}