/* 
 * ALBI Premium Design System v2.0
 * 프리미엄 1시간 직장체험 플랫폼
 */

/* =====================================
   1. CSS 변수 정의 (Premium Design Tokens)
   ===================================== */
:root {
  /* Premium Brand Colors - 고급스러운 색상 팔레트 */
  --albi-primary: #FF6B35;
  --albi-primary-light: #FF8856;
  --albi-primary-dark: #E55729;
  --albi-primary-gradient: linear-gradient(135deg, #FF6B35 0%, #FF8856 100%);
  
  --albi-secondary: #1E3A8A;
  --albi-secondary-light: #3B82F6;
  --albi-secondary-dark: #1E40AF;
  
  --albi-accent: #F59E0B;
  --albi-success: #10B981;
  --albi-danger: #EF4444;
  --albi-warning: #F59E0B;
  
  /* Elegant Gray Scale */
  --gray-50: #FAFAFA;
  --gray-100: #F5F5F5;
  --gray-200: #E5E5E5;
  --gray-300: #D4D4D4;
  --gray-400: #A3A3A3;
  --gray-500: #737373;
  --gray-600: #525252;
  --gray-700: #404040;
  --gray-800: #262626;
  --gray-900: #171717;
  
  /* Premium Spacing System */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  
  /* Sophisticated Border Radius */
  --radius-sm: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-2xl: 2rem;
  --radius-full: 9999px;
  
  /* Premium Shadows - Layered depth */
  --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-sm: 0 2px 4px 0 rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 12px 0 rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 24px 0 rgba(0, 0, 0, 0.12);
  --shadow-xl: 0 16px 48px 0 rgba(0, 0, 0, 0.15);
  --shadow-2xl: 0 24px 64px 0 rgba(0, 0, 0, 0.2);
  --shadow-inner: inset 0 2px 4px 0 rgba(0, 0, 0, 0.06);
  
  /* Premium Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, 'Pretendard', 'SF Pro Display', 'Segoe UI', 'Apple SD Gothic Neo', sans-serif;
  --font-display: 'SF Pro Display', 'Pretendard', -apple-system, sans-serif;
  
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;
  
  /* Premium Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: 500ms cubic-bezier(0.68, -0.55, 0.265, 1.55);
  
  /* Z-index Layers */
  --z-base: 0;
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal-backdrop: 1040;
  --z-modal: 1050;
  --z-popover: 1060;
  --z-tooltip: 1070;
  --z-notification: 1080;
}

/* =====================================
   2. Modern Reset & Base
   ===================================== */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--gray-900);
  background: var(--gray-50);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

/* =====================================
   3. Premium Typography
   ===================================== */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

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); }

/* =====================================
   4. Premium Container System
   ===================================== */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--space-6);
}

@media (max-width: 640px) {
  .container {
    padding: 0 var(--space-4);
  }
}

/* =====================================
   5. Premium Button System
   ===================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 600;
  line-height: 1.5;
  text-decoration: none;
  border: 2px solid transparent;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-base);
  white-space: nowrap;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background: var(--albi-primary-gradient);
  color: white;
  box-shadow: var(--shadow-md);
}

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

.btn-secondary {
  background: white;
  color: var(--albi-primary);
  border-color: var(--albi-primary);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  background: var(--albi-primary);
  color: white;
  box-shadow: var(--shadow-md);
}

.btn-ghost {
  background: transparent;
  color: var(--gray-700);
  border-color: var(--gray-300);
}

.btn-ghost:hover {
  background: var(--gray-100);
  border-color: var(--gray-400);
}

/* Button Sizes */
.btn-sm {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
}

.btn-lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--text-lg);
  border-radius: var(--radius-xl);
}

.btn-xl {
  padding: var(--space-5) var(--space-10);
  font-size: var(--text-xl);
  border-radius: var(--radius-xl);
}

/* =====================================
   6. Premium Card System
   ===================================== */
.card {
  background: white;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: all var(--transition-base);
  border: 1px solid var(--gray-200);
}

.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
  border-color: var(--gray-300);
}

.card-body {
  padding: var(--space-6);
}

.card-elevated {
  box-shadow: var(--shadow-md);
}

.card-premium {
  background: linear-gradient(135deg, #FFFFFF 0%, #F9FAFB 100%);
  border: 2px solid var(--gray-200);
}

/* =====================================
   7. Premium Navigation
   ===================================== */
.navbar {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: var(--shadow-sm);
  padding: var(--space-4) 0;
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  border-bottom: 1px solid var(--gray-200);
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--gray-900);
  text-decoration: none;
  transition: transform var(--transition-base);
}

.navbar-brand:hover {
  transform: scale(1.05);
}

.nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-base);
  font-weight: 500;
  color: var(--gray-700);
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
}

.nav-link:hover {
  color: var(--albi-primary);
  background: var(--gray-100);
}

.nav-link.active {
  color: var(--albi-primary);
  background: rgba(255, 107, 53, 0.1);
  font-weight: 600;
}

/* =====================================
   8. Bottom Navigation (Mobile)
   ===================================== */
.bottom-nav {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 -4px 16px rgba(0, 0, 0, 0.1);
  padding: var(--space-2) 0;
  z-index: var(--z-fixed);
  border-top: 1px solid var(--gray-200);
}

@media (max-width: 768px) {
  .bottom-nav {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
  }
  
  body {
    padding-bottom: 80px;
  }
}

.bottom-nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
  padding: var(--space-2);
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--gray-600);
  text-decoration: none;
  transition: all var(--transition-fast);
}

.bottom-nav-item:active {
  transform: scale(0.95);
}

.bottom-nav-item.active {
  color: var(--albi-primary);
}

.bottom-nav-icon {
  font-size: var(--text-2xl);
}

/* =====================================
   9. Premium Badge System
   ===================================== */
.badge {
  display: inline-flex;
  align-items: center;
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  font-weight: 600;
  border-radius: var(--radius-full);
  white-space: nowrap;
}

.badge-primary {
  background: var(--albi-primary);
  color: white;
}

.badge-secondary {
  background: var(--gray-200);
  color: var(--gray-700);
}

.badge-success {
  background: var(--albi-success);
  color: white;
}

/* =====================================
   10. Utility Classes
   ===================================== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.flex { display: flex; }
.inline-flex { display: inline-flex; }
.grid { display: grid; }

.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.items-end { align-items: flex-end; }

.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-start { justify-content: flex-start; }
.justify-end { justify-content: flex-end; }

.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }

.mx-auto { margin-left: auto; margin-right: auto; }
.mb-2 { margin-bottom: var(--space-2); }
.mb-3 { margin-bottom: var(--space-3); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }

.font-bold { font-weight: 700; }
.font-semibold { font-weight: 600; }
.font-medium { font-weight: 500; }

.rounded-lg { border-radius: var(--radius-lg); }
.rounded-xl { border-radius: var(--radius-xl); }
.rounded-2xl { border-radius: var(--radius-2xl); }
.rounded-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); }

/* =====================================
   11. Responsive Grid System
   ===================================== */
.grid-cols-1 { grid-template-columns: repeat(1, minmax(0, 1fr)); }
.grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

@media (min-width: 640px) {
  .sm\\:grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .sm\\:grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (min-width: 768px) {
  .md\\:grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .md\\:grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .md\\:grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

@media (min-width: 1024px) {
  .lg\\:grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .lg\\:grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

/* =====================================
   12. Premium Animations
   ===================================== */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes slideInUp {
  from { opacity: 0; transform: translateY(40px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes scaleIn {
  from { opacity: 0; transform: scale(0.9); }
  to { opacity: 1; transform: scale(1); }
}

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

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

.animate-slideInUp {
  animation: slideInUp 0.8s ease-out forwards;
}

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

/* =====================================
   13. Print & Accessibility
   ===================================== */
@media print {
  .no-print {
    display: none !important;
  }
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* Focus visible for keyboard navigation */
*:focus-visible {
  outline: 2px solid var(--albi-primary);
  outline-offset: 2px;
}

button:focus-visible,
a:focus-visible {
  outline: 2px solid var(--albi-primary);
  outline-offset: 2px;
}