/* ==========================================================================
   ONCOHELIX AI — MAIN CSS DESIGN SYSTEM
   Bio-Tech Luxe Theme (Dark Graphite, Neon Lime, Electric Blue, Glassmorphism)
   ========================================================================== */

:root {
  /* Color Palette - Bio-Tech Luxe */
  --bg-dark: #0B0E14;
  --bg-dark-secondary: #12151E;
  --bg-card: rgba(22, 27, 38, 0.65);
  --bg-card-hover: rgba(28, 35, 50, 0.85);

  --accent-lime: #A8FF00;
  --accent-lime-glow: rgba(168, 255, 0, 0.4);
  --accent-cyan: #00D9F5;
  --accent-cyan-glow: rgba(0, 217, 245, 0.4);
  --accent-blue: #0052FF;
  --accent-blue-glow: rgba(0, 82, 255, 0.4);

  --text-main: #F0F4FC;
  --text-muted: #8E9BAE;
  --text-dim: #5C6779;

  --border-glass: rgba(168, 255, 0, 0.15);
  --border-glass-cyan: rgba(0, 217, 245, 0.18);
  --border-light: rgba(255, 255, 255, 0.08);

  /* Fonts */
  --font-heading: 'Plus Jakarta Sans', 'Inter', sans-serif;
  --font-body: 'Inter', sans-serif;
  --font-mono: 'Space Mono', monospace;

  /* Shadows & Blur */
  --backdrop-blur: blur(16px);
  --glass-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
  --glow-shadow: 0 0 25px var(--accent-lime-glow);

  /* Transitions */
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

/* CSS Reset & Global Rules */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  background-color: var(--bg-dark);
  color: var(--text-main);
  font-family: var(--font-body);
  overflow-x: hidden;
}

body {
  min-height: 100vh;
  line-height: 1.6;
  position: relative;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Scrollbar Styling */
::-webkit-scrollbar {
  width: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg-dark);
}
::-webkit-scrollbar-thumb {
  background: #1C2332;
  border-radius: 4px;
  border: 2px solid var(--bg-dark);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--accent-lime);
}

/* Background Particle Canvas */
#bg-particle-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: -1;
  pointer-events: none;
  opacity: 0.6;
}

/* Layout Utilities */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
}

.text-center { text-align: center; }
.grid-2-col { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; }
.grid-3-col { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.grid-4-col { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }

/* Glassmorphism Card Utility */
.glass-card {
  background: var(--bg-card);
  backdrop-filter: var(--backdrop-blur);
  -webkit-backdrop-filter: var(--backdrop-blur);
  border: 1px solid var(--border-glass);
  border-radius: 20px;
  box-shadow: var(--glass-shadow);
  transition: transform var(--transition-smooth), border-color var(--transition-smooth), box-shadow var(--transition-smooth);
}

.glass-card:hover {
  border-color: rgba(168, 255, 0, 0.35);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.6), 0 0 20px var(--accent-lime-glow);
}

/* Typography & Gradient Text */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  color: var(--text-main);
}

.gradient-text {
  background: linear-gradient(135deg, var(--accent-lime) 0%, var(--accent-cyan) 50%, #ffffff 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.section-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--accent-lime);
  background: rgba(168, 255, 0, 0.1);
  border: 1px solid rgba(168, 255, 0, 0.3);
  padding: 6px 14px;
  border-radius: 50px;
  margin-bottom: 16px;
}

.section-title {
  font-size: 2.75rem;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.section-description {
  font-size: 1.125rem;
  color: var(--text-muted);
  max-width: 680px;
  margin: 0 auto 48px;
}

/* Button Component System */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 14px 28px;
  border-radius: 50px;
  text-decoration: none;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-lime) 0%, #76CB00 100%);
  color: #0B0E14;
  font-weight: 700;
  border: none;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 25px var(--accent-lime-glow);
  filter: brightness(1.05);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-main);
  border: 1px solid var(--border-light);
  backdrop-filter: blur(8px);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

.btn-glow {
  position: relative;
  overflow: hidden;
}

.btn-glow::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(255,255,255,0.4) 0%, transparent 60%);
  transform: scale(0);
  transition: transform 0.6s ease-out;
}

.btn-glow:hover::before {
  transform: scale(1);
}

.btn-lg {
  padding: 16px 36px;
  font-size: 1.05rem;
}

.btn-block {
  width: 100%;
}

/* Tag Badges */
.tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  padding: 4px 8px;
  border-radius: 4px;
  font-weight: 700;
  text-transform: uppercase;
}

.tag.lime {
  background: rgba(168, 255, 0, 0.15);
  color: var(--accent-lime);
  border: 1px solid rgba(168, 255, 0, 0.3);
}

.tag.cyan {
  background: rgba(0, 217, 245, 0.15);
  color: var(--accent-cyan);
  border: 1px solid rgba(0, 217, 245, 0.3);
}

.tag.blue {
  background: rgba(0, 82, 255, 0.15);
  color: #6699FF;
  border: 1px solid rgba(0, 82, 255, 0.3);
}