/* ========================================
   RedAlert Landing Page Showcase
   Base Styles & Design System
   ======================================== */

/* CSS Variables - Brand Colors */
:root {
  /* Primary Colors */
  --cyan-primary: #4EBCD4;
  --cyan-light: #7DD3E8;
  --cyan-dark: #2A9BB5;
  --cyan-glow: rgba(78, 188, 212, 0.5);
  
  /* Neutral Colors */
  --white: #FFFFFF;
  --gray-100: #F5F5F5;
  --gray-200: #E0E0E0;
  --gray-300: #B0B0B0;
  --gray-400: #808080;
  --gray-500: #606060;
  --gray-600: #404040;
  --gray-700: #2A2A2A;
  --gray-800: #1A1A1A;
  --gray-900: #0D0D0D;
  --black: #000000;
  
  /* Background Colors */
  --bg-dark: #0A0A0F;
  --bg-card: rgba(20, 20, 30, 0.8);
  --bg-card-hover: rgba(30, 30, 45, 0.9);
  
  /* Glass Effect */
  --glass-bg: rgba(255, 255, 255, 0.05);
  --glass-border: rgba(255, 255, 255, 0.1);
  
  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-display: 'Outfit', 'Inter', sans-serif;
  
  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;
  
  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 20px;
  --radius-2xl: 32px;
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 300ms ease;
  --transition-slow: 500ms ease;
  
  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 30px var(--cyan-glow);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-primary);
  background-color: var(--bg-dark);
  color: var(--white);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  text-decoration: none;
  color: inherit;
  transition: color var(--transition-fast);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

ul, ol {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.2;
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
h2 { font-size: clamp(2rem, 4vw, 3rem); }
h3 { font-size: clamp(1.5rem, 3vw, 2rem); }
h4 { font-size: clamp(1.25rem, 2vw, 1.5rem); }

p {
  font-size: 1rem;
  color: var(--gray-300);
}

/* Container */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-xl);
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-lg);
  transition: all var(--transition-normal);
}

.btn-primary {
  background: linear-gradient(135deg, var(--cyan-primary), var(--cyan-dark));
  color: var(--white);
  box-shadow: var(--shadow-md), 0 0 20px rgba(78, 188, 212, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.btn-outline {
  background: transparent;
  color: var(--cyan-primary);
  border: 2px solid var(--cyan-primary);
}

.btn-outline:hover {
  background: var(--cyan-primary);
  color: var(--bg-dark);
}

/* Cards */
.card {
  background: var(--bg-card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  transition: all var(--transition-normal);
}

.card:hover {
  background: var(--bg-card-hover);
  border-color: var(--cyan-primary);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

/* Glass Effect */
.glass {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
}

/* Text Gradient */
.text-gradient {
  background: linear-gradient(135deg, var(--cyan-light), var(--cyan-primary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Animations */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

@keyframes glow {
  0%, 100% { box-shadow: 0 0 20px var(--cyan-glow); }
  50% { box-shadow: 0 0 40px var(--cyan-glow), 0 0 60px var(--cyan-glow); }
}

.animate-fadeIn {
  animation: fadeIn 0.6s ease forwards;
}

.animate-fadeInUp {
  animation: fadeInUp 0.6s ease forwards;
}

.animate-float {
  animation: float 3s ease-in-out infinite;
}

/* Responsive */
@media (max-width: 768px) {
  html { font-size: 14px; }
  
  .container {
    padding: 0 var(--space-md);
  }
}

@media (max-width: 480px) {
  html { font-size: 13px; }
}