/* =========================================================================
   Base Variables & Theme (Neon Cosmic Space)
   ========================================================================= */
:root {
  /* Colors */
  --bg-dark: #0a0a1a;
  --bg-gradient: radial-gradient(circle at top right, #1a0b2e, #0a0a1a);
  --neon-cyan: #00f3ff;
  --neon-pink: #ff00ea;
  --neon-purple: #b026ff;
  --neon-yellow: #fffb00;
  
  /* Text */
  --text-main: #e0e0ff;
  --text-muted: #9ba1cc;

  /* Glassmorphism */
  --glass-bg: rgba(25, 25, 50, 0.4);
  --glass-border: rgba(255, 255, 255, 0.1);
  --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.5);

  /* Typography */
  --font-main: 'Inter', system-ui, -apple-system, sans-serif;
}

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

body {
  font-family: var(--font-main);
  background: var(--bg-dark);
  background-image: var(--bg-gradient);
  color: var(--text-main);
  min-height: 100vh;
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
}

/* Canvas Background */
#particles-bg {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  pointer-events: none;
}

/* =========================================================================
   Typography & Links
   ========================================================================= */
h1, h2, h3, h4 {
  color: #fff;
  line-height: 1.2;
  margin-bottom: 1rem;
}

h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  text-shadow: 0 0 10px var(--neon-cyan), 0 0 20px var(--neon-cyan);
  text-align: center;
  margin: 2rem 0;
}

h2 {
  font-size: clamp(2rem, 4vw, 3rem);
  text-shadow: 0 0 8px var(--neon-pink);
}

a {
  color: var(--neon-cyan);
  text-decoration: none;
  transition: all 0.3s ease;
}

a:hover {
  color: var(--neon-pink);
  text-shadow: 0 0 8px var(--neon-pink);
}

/* =========================================================================
   Navigation
   ========================================================================= */
.top-nav {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 1rem;
  padding: 1.5rem;
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--glass-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.top-nav a {
  color: var(--text-main);
  font-weight: 600;
  padding: 0.5rem 1rem;
  border-radius: 8px;
  border: 1px solid transparent;
}

.top-nav a:hover,
.top-nav a.active {
  background: rgba(255, 255, 255, 0.05);
  border-color: var(--neon-cyan);
  color: var(--neon-cyan);
  box-shadow: 0 0 10px rgba(0, 243, 255, 0.2);
}

/* =========================================================================
   Layout & Cards (Glassmorphism)
   ========================================================================= */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  margin-top: 2rem;
}

.glass-card {
  background: var(--glass-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  padding: 2rem;
  box-shadow: var(--glass-shadow);
  transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
  display: flex;
  flex-direction: column;
}

.glass-card:hover {
  transform: translateY(-5px);
  border-color: var(--neon-purple);
  box-shadow: 0 10px 40px rgba(176, 38, 255, 0.3);
}

.glass-card h3 {
  color: var(--neon-cyan);
  margin-bottom: 1rem;
}

/* =========================================================================
   Buttons
   ========================================================================= */
.btn-neon {
  display: inline-block;
  padding: 0.8rem 1.5rem;
  background: transparent;
  color: var(--neon-pink);
  border: 2px solid var(--neon-pink);
  border-radius: 8px;
  font-weight: bold;
  text-transform: uppercase;
  letter-spacing: 1px;
  cursor: pointer;
  box-shadow: 0 0 10px rgba(255, 0, 234, 0.2), inset 0 0 10px rgba(255, 0, 234, 0.2);
  transition: all 0.3s ease;
  text-align: center;
  margin-top: auto;
  min-height: 44px; /* Standard mobile touch target */
  display: flex;
  align-items: center;
  justify-content: center;
}

.btn-neon:hover {
  background: var(--neon-pink);
  color: #fff;
  box-shadow: 0 0 20px rgba(255, 0, 234, 0.6), inset 0 0 10px rgba(255, 255, 255, 0.5);
  text-shadow: none;
}

.btn-cyan {
  color: var(--neon-cyan);
  border-color: var(--neon-cyan);
  box-shadow: 0 0 10px rgba(0, 243, 255, 0.2), inset 0 0 10px rgba(0, 243, 255, 0.2);
}

.btn-cyan:hover {
  background: var(--neon-cyan);
  box-shadow: 0 0 20px rgba(0, 243, 255, 0.6), inset 0 0 10px rgba(255, 255, 255, 0.5);
}

/* =========================================================================
   Utilities
   ========================================================================= */
.text-center { text-align: center; }
.mb-2 { margin-bottom: 2rem; }
.mt-2 { margin-top: 2rem; }

/* Responsive Adjustments */
@media (max-width: 768px) {
  body { font-size: 16px; } /* Explicit baseline for mobile bots */
  h1 { font-size: 2.2rem; margin: 1.5rem 0; }
  h2 { font-size: 1.8rem; }
  
  .container {
    padding: 1.2rem;
  }
  .top-nav {
    padding: 1rem 0.5rem;
    gap: 0.4rem;
  }
  .top-nav a {
    font-size: 1rem;
    padding: 0.7rem 0.9rem;
    min-height: 48px; /* Extra large touch targets for SEMrush */
    display: flex;
    align-items: center;
  }
  .glass-card {
    padding: 1.5rem;
  }
  .grid {
    gap: 1.5rem;
  }
}