/* 
  Unified Design System for Damilare Lekan Adekeye Portfolio
  Ensures consistency, professionalism, and modern aesthetic
*/

:root {
  /* Color Palette - Maintaining existing colors with refinement */
  --color-primary: #00aaff;
  --color-primary-hover: #0088cc;
  --color-primary-light: rgba(0, 170, 255, 0.15);
  --color-primary-glow: rgba(0, 170, 255, 0.4);
  
  --color-bg-dark: #0a0a0a;
  --color-bg-main: #121212;
  --color-bg-card: #1a1a1a;
  --color-bg-overlay: rgba(0, 0, 0, 0.4);
  --color-bg-glass: rgba(10, 10, 10, 0.85);
  
  --color-text-primary: #ffffff;
  --color-text-secondary: #b8b8b8;
  --color-text-muted: #888888;
  --color-text-link: #00aaff;
  
  --color-border: #2a2a2a;
  --color-border-hover: #3a3a3a;
  --color-border-accent: rgba(0, 170, 255, 0.3);
  
  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'SF Mono', 'Monaco', 'Cascadia Code', monospace;
  
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  --font-size-4xl: 2.5rem;
  --font-size-5xl: 3rem;
  
  --font-weight-light: 300;
  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  --line-height-tight: 1.2;
  --line-height-base: 1.6;
  --line-height-relaxed: 1.8;
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;
  
  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 350ms ease;
  --transition-smooth: cubic-bezier(0.4, 0, 0.2, 1);
  
  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.5);
  --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.6);
  --shadow-glow: 0 0 20px var(--color-primary-glow);
  
  /* Z-index */
  --z-base: 0;
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-overlay: 300;
  --z-modal: 400;
  --z-tooltip: 500;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-primary);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-regular);
  line-height: var(--line-height-base);
  color: var(--color-text-primary);
  background-color: var(--color-bg-dark);
  min-height: 100vh;
  overflow-x: hidden;
}

/* Typography Classes */
.heading-1 {
  font-size: clamp(2.5rem, 5vw, var(--font-size-5xl));
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  letter-spacing: -0.02em;
}

.heading-2 {
  font-size: clamp(2rem, 4vw, var(--font-size-4xl));
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-tight);
  letter-spacing: -0.01em;
}

.heading-3 {
  font-size: clamp(1.5rem, 3vw, var(--font-size-3xl));
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-tight);
}

.text-body {
  font-size: var(--font-size-base);
  line-height: var(--line-height-relaxed);
  color: var(--color-text-secondary);
}

.text-small {
  font-size: var(--font-size-sm);
  line-height: var(--line-height-base);
}

.text-muted {
  color: var(--color-text-muted);
}

/* Button Styles */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-sm) var(--spacing-lg);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  line-height: 1.5;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  transform: translate(-50%, -50%);
  transition: width var(--transition-slow), height var(--transition-slow);
}

.btn:hover::before {
  width: 300px;
  height: 300px;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-hover));
  color: var(--color-text-primary);
  box-shadow: var(--shadow-sm);
}

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

.btn-secondary {
  background: var(--color-bg-card);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  background: var(--color-bg-card);
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.btn-ghost {
  background: transparent;
  color: var(--color-text-secondary);
  border: 1px solid transparent;
}

.btn-ghost:hover {
  background: var(--color-primary-light);
  color: var(--color-primary);
}

/* Card Component */
.card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--color-primary), transparent);
  transform: translateX(-100%);
  transition: transform var(--transition-slow);
}

.card:hover::before {
  transform: translateX(100%);
}

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

/* Glass Morphism Effect */
.glass {
  background: var(--color-bg-glass);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

/* Navigation Styles */
.nav-link {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-weight: var(--font-weight-medium);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transform: translateX(-50%);
  transition: width var(--transition-base);
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-primary);
  background: var(--color-primary-light);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 80%;
}

/* Form Elements */
.form-input,
.form-textarea {
  width: 100%;
  padding: var(--spacing-md);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-primary);
  font-size: var(--font-size-base);
  font-family: var(--font-primary);
  transition: all var(--transition-base);
}

.form-input:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  background: var(--color-bg-main);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}

.form-label {
  display: block;
  margin-bottom: var(--spacing-sm);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Loading Animation */
@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

.loading {
  animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

/* Subtle Fade In Animation */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  animation: fadeIn var(--transition-slow) var(--transition-smooth);
}

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

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

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

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

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

/* Responsive Breakpoints */
@media (max-width: 1024px) {
  :root {
    --font-size-base: 0.95rem;
  }
  
  .container {
    padding: 0 var(--spacing-md);
  }
}

@media (max-width: 768px) {
  :root {
    --font-size-base: 0.9rem;
  }
  
  .heading-1 {
    font-size: clamp(2rem, 6vw, var(--font-size-4xl));
  }
  
  .btn {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-sm);
  }
}

@media (max-width: 480px) {
  :root {
    --spacing-lg: 1rem;
    --spacing-xl: 1.5rem;
    --spacing-2xl: 2rem;
  }
}