/* ================================================
   MODERN DESIGN SYSTEM - 2025 TRENDS
   ================================================ */

/* === CSS CUSTOM PROPERTIES === */
:root {
  /* Vibrant Gradient Colors */
  --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  --gradient-accent: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
  --gradient-warm: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
  --gradient-mesh: radial-gradient(at 40% 20%, hsla(258, 77%, 56%, 1) 0px, transparent 50%),
                   radial-gradient(at 80% 0%, hsla(189, 100%, 56%, 1) 0px, transparent 50%),
                   radial-gradient(at 0% 50%, hsla(355, 100%, 93%, 0.3) 0px, transparent 50%),
                   radial-gradient(at 80% 50%, hsla(340, 100%, 76%, 0.3) 0px, transparent 50%);
  
  /* Glass Effect Variables */
  --glass-bg: rgba(255, 255, 255, 0.05);
  --glass-bg-light: rgba(255, 255, 255, 0.1);
  --glass-border: rgba(255, 255, 255, 0.18);
  --glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.37);
  --blur-amount: 12px;
  
  /* Dark Mode Color Palette */
  --bg-primary: #0a0a0f;
  --bg-secondary: #16161e;
  --bg-tertiary: #1f1f2e;
  --bg-card: rgba(26, 26, 46, 0.8);
  
  --text-primary: #f0f0f5;
  --text-secondary: #b4b4c8;
  --text-muted: #7a7a8c;
  
  --accent-purple: #667eea;
  --accent-pink: #f093fb;
  --accent-cyan: #4facfe;
  --accent-green: #43e97b;
  
  /* Spacing Scale */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-2xl: 4rem;
  --space-3xl: 6rem;
  
  /* Typography Scale */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-accent: 'Outfit', 'Space Grotesk', sans-serif;
  
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.375vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.625vw, 1.5rem);
  --text-xl: clamp(1.5rem, 1.25rem + 1.25vw, 2rem);
  --text-2xl: clamp(2rem, 1.5rem + 2.5vw, 3rem);
  --text-3xl: clamp(2.5rem, 2rem + 2.5vw, 4rem);
  --text-4xl: clamp(3rem, 2.5rem + 2.5vw, 5rem);
  
  /* Border Radius */
  --radius-sm: 0.5rem;
  --radius-md: 1rem;
  --radius-lg: 1.5rem;
  --radius-xl: 2rem;
  --radius-full: 50%;
  
  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: 600ms cubic-bezier(0.68, -0.55, 0.265, 1.55);
  
  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.15);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.2);
  --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.25);
  --shadow-glow: 0 0 32px rgba(102, 126, 234, 0.5);
  --shadow-glow-pink: 0 0 32px rgba(240, 147, 251, 0.5);
  --shadow-glow-cyan: 0 0 32px rgba(79, 172, 254, 0.5);
}

/* === GLOBAL RESET & BASE STYLES === */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  overflow-x: hidden;
}

body {
  font-family: var(--font-primary);
  font-size: var(--text-base);
  line-height: 1.7;
  color: var(--text-primary);
  background: var(--bg-primary);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* === CUSTOM SCROLLBAR === */
::-webkit-scrollbar {
  width: 12px;
}

::-webkit-scrollbar-track {
  background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--accent-purple), var(--accent-pink));
  border-radius: 6px;
  border: 2px solid var(--bg-secondary);
}

::-webkit-scrollbar-thumb:hover {
  background: linear-gradient(180deg, var(--accent-cyan), var(--accent-purple));
}

/* === TYPOGRAPHY === */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-accent);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--space-md);
  background: linear-gradient(135deg, var(--accent-purple), var(--accent-pink));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

h1 { font-size: var(--text-4xl); }
h2 { font-size: var(--text-3xl); }
h3 { font-size: var(--text-2xl); }
h4 { font-size: var(--text-xl); }
h5 { font-size: var(--text-lg); }
h6 { font-size: var(--text-base); }

p {
  margin-bottom: var(--space-md);
  color: var(--text-secondary);
}

a {
  color: var(--accent-cyan);
  text-decoration: none;
  transition: all var(--transition-base);
  position: relative;
}

a:hover {
  color: var(--accent-purple);
}

a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-primary);
  transition: width var(--transition-base);
}

a:hover::after {
  width: 100%;
}

/* === GLASSMORPHISM UTILITIES === */
.glass {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--blur-amount));
  -webkit-backdrop-filter: blur(var(--blur-amount));
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
}

.glass-light {
  background: var(--glass-bg-light);
  backdrop-filter: blur(var(--blur-amount));
  -webkit-backdrop-filter: blur(var(--blur-amount));
  border: 1px solid var(--glass-border);
}

.glass-card {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--blur-amount));
  -webkit-backdrop-filter: blur(var(--blur-amount));
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  box-shadow: var(--shadow-lg);
  transition: all var(--transition-base);
}

.glass-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl), var(--shadow-glow);
  border-color: rgba(255, 255, 255, 0.3);
}

/* === GRADIENT UTILITIES === */
.gradient-text {
  background: linear-gradient(135deg, var(--accent-purple), var(--accent-pink));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.gradient-bg-primary {
  background: var(--gradient-primary);
}

.gradient-bg-secondary {
  background: var(--gradient-secondary);
}

.gradient-bg-accent {
  background: var(--gradient-accent);
}

.gradient-mesh-bg {
  background: var(--bg-primary);
  position: relative;
}

.gradient-mesh-bg::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--gradient-mesh);
  opacity: 0.5;
  z-index: 0;
}

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

.container-wide {
  max-width: 1400px;
}

.container-narrow {
  max-width: 800px;
}

section {
  padding: var(--space-3xl) 0;
  position: relative;
  overflow: hidden;
}

.section-title {
  text-align: center;
  margin-bottom: var(--space-2xl);
  font-size: var(--text-3xl);
}

/* === BUTTON STYLES === */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-lg);
  font-family: var(--font-accent);
  font-size: var(--text-base);
  font-weight: 600;
  border: none;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
  z-index: 1;
}

.btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--accent-purple), var(--accent-pink));
  z-index: -1;
  transition: opacity var(--transition-base);
}

.btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
  z-index: -1;
  opacity: 0;
  transition: opacity var(--transition-base);
}

.btn:hover::after {
  opacity: 1;
}

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

.btn:active {
  transform: translateY(0);
}

.btn-primary {
  color: white;
}

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

.btn-outline::before,
.btn-outline::after {
  display: none;
}

.btn-outline:hover {
  background: var(--accent-purple);
  color: white;
}

/* === CARD STYLES === */
.card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  border: 1px solid rgba(255, 255, 255, 0.1);
  transition: all var(--transition-base);
}

.card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
  border-color: rgba(255, 255, 255, 0.2);
}

/* === GRID SYSTEM === */
.grid {
  display: grid;
  gap: var(--space-lg);
}

.grid-2 {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.grid-4 {
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

/* === UTILITY CLASSES === */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.flex { display: flex; }
.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}
.flex-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.flex-column {
  display: flex;
  flex-direction: column;
}

.gap-xs { gap: var(--space-xs); }
.gap-sm { gap: var(--space-sm); }
.gap-md { gap: var(--space-md); }
.gap-lg { gap: var(--space-lg); }
.gap-xl { gap: var(--space-xl); }

.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }

.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }

.radius-sm { border-radius: var(--radius-sm); }
.radius-md { border-radius: var(--radius-md); }
.radius-lg { border-radius: var(--radius-lg); }
.radius-xl { border-radius: var(--radius-xl); }
.radius-full { border-radius: var(--radius-full); }

.shadow-sm { box-shadow: var(--shadow-sm); }
.shadow-md { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }
.shadow-xl { box-shadow: var(--shadow-xl); }
.shadow-glow { box-shadow: var(--shadow-glow); }

/* === RESPONSIVE === */
@media (max-width: 768px) {
  :root {
    --space-3xl: 4rem;
  }
  
  section {
    padding: var(--space-2xl) 0;
  }
  
  .grid-2, .grid-3, .grid-4 {
    grid-template-columns: 1fr;
  }
  
  .container {
    padding: 0 var(--space-md);
  }
}

@media (max-width: 480px) {
  :root {
    --space-2xl: 2.5rem;
  }
  
  .glass-card {
    padding: var(--space-md);
  }
}