/* Modern Design System - Inspired by shadcn/ui and Vibe Coding */

:root {
  /* Colors - Slate palette */
  --slate-50: #f8fafc;
  --slate-100: #f1f5f9;
  --slate-200: #e2e8f0;
  --slate-300: #cbd5e1;
  --slate-400: #94a3b8;
  --slate-500: #64748b;
  --slate-600: #475569;
  --slate-700: #334155;
  --slate-800: #1e293b;
  --slate-900: #0f172a;
  
  /* Blue palette */
  --blue-50: #eff6ff;
  --blue-100: #dbeafe;
  --blue-500: #3b82f6;
  --blue-600: #2563eb;
  --blue-700: #1d4ed8;
  
  /* Purple palette */
  --purple-50: #faf5ff;
  --purple-100: #f3e8ff;
  --purple-500: #8b5cf6;
  --purple-600: #7c3aed;
  --purple-700: #6d28d9;
  
  /* Green palette */
  --green-50: #f0fdf4;
  --green-100: #dcfce7;
  --green-500: #22c55e;
  --green-600: #16a34a;
  --green-700: #15803d;
  
  /* Typography */
  --font-sans: 'Pretendard', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  --font-mono: 'SF Mono', 'Monaco', 'Inconsolata', 'Roboto Mono', monospace;
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 0.75rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  
  /* Border radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
}

/* Base styles */
body {
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Modern button styles */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-lg, 0.5rem);
  padding: 0.5rem 1rem; /* py-2 px-4 */
  font-size: 0.875rem; /* text-sm */
  font-weight: 500; /* font-medium */
  transition: all 0.2s ease;
  outline: none;
}

.btn-primary {
  background: var(--blue-600);
  color: #fff;
  box-shadow: var(--shadow-sm);
}
.btn-primary:hover { background: var(--blue-700); box-shadow: var(--shadow-md); }
.btn-primary:focus { box-shadow: 0 0 0 2px rgba(59,130,246,0.5); }

.btn-secondary {
  background: #fff;
  color: var(--slate-700);
  border: 1px solid var(--slate-300);
}
.btn-secondary:hover { background: var(--slate-100); }
.btn-secondary:focus { box-shadow: 0 0 0 2px rgba(100,116,139,0.5); }

.btn-ghost {
  background: transparent;
  color: var(--slate-600);
}
.btn-ghost:hover { background: var(--slate-100); color: var(--slate-900); }

/* Modern card styles */
.card {
  background: #fff;
  border-radius: 1rem; /* rounded-2xl */
  border: 1px solid var(--slate-200);
  box-shadow: var(--shadow-sm);
}

.card-hover { transition: box-shadow .3s ease; }
.card-hover:hover { box-shadow: var(--shadow-lg); }

/* Modern input styles */
.input {
  width: 100%;
  padding: 0.75rem 1rem; /* py-3 px-4 */
  border: 1px solid var(--slate-300);
  border-radius: 0.75rem; /* rounded-xl */
  transition: all .2s ease;
  color: var(--slate-900);
}
.input::placeholder { color: var(--slate-400); }
.input:focus { outline: none; box-shadow: 0 0 0 2px rgba(37,99,235,0.5); border-color: transparent; }

/* Gradient text */
.gradient-text {
  color: transparent;
  -webkit-background-clip: text;
  background-clip: text;
  background-image: linear-gradient(to right, var(--blue-600), var(--purple-600));
}

/* Modern animations */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes slideUp {
  from { transform: translateY(100%); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

@keyframes pulse-glow {
  0%, 100% { 
    box-shadow: 0 0 5px rgba(59, 130, 246, 0.5);
  }
  50% { 
    box-shadow: 0 0 20px rgba(59, 130, 246, 0.8);
  }
}

.animate-fade-in {
  animation: fadeIn 0.5s ease-out;
}

.animate-slide-up {
  animation: slideUp 0.3s ease-out;
}

.animate-pulse-glow {
  animation: pulse-glow 2s infinite;
}

/* Glass morphism effect */
.glass {
  background: rgba(255,255,255,0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255,255,255,0.2);
}

/* Modern scroll bar */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: var(--slate-100);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb {
  background: var(--slate-400);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--slate-500);
}

/* Loading states */
.loading-skeleton { animation: pulse 2s cubic-bezier(0.4,0,0.6,1) infinite; background: var(--slate-200); border-radius: 0.25rem; }

.loading-dots::after {
  content: '';
  animation: loading-dots 1.5s infinite;
}

@keyframes loading-dots {
  0%, 20% { content: '.'; }
  40% { content: '..'; }
  60%, 100% { content: '...'; }
}

/* Modern focus states */
.focus-ring:focus { outline: none; box-shadow: 0 0 0 2px rgba(59,130,246,0.6); }

/* Responsive utilities */
@media (max-width: 640px) {
  .mobile-full { width: 100%; }
  
  .mobile-stack { flex-direction: column; }
}

/* Dark mode support (future) */
@media (prefers-color-scheme: dark) {
  .dark-mode {
    --slate-50: #0f172a;
    --slate-100: #1e293b;
    --slate-900: #f8fafc;
  }
}

/* Custom components */
.status-badge { display: inline-flex; align-items: center; padding: 0.125rem 0.625rem; border-radius: 9999px; font-size: 0.75rem; font-weight: 500; }

.status-badge.success { background: #dcfce7; color: #166534; }

.status-badge.warning { background: #fef9c3; color: #854d0e; }

.status-badge.error { background: #fee2e2; color: #991b1b; }

.status-badge.info { background: #dbeafe; color: #1e40af; }

/* Modern form styles */
.form-group > * + * { margin-top: 0.5rem; }

.form-label { display: block; font-size: 0.875rem; font-weight: 500; color: var(--slate-700); }

.form-input { width: 100%; padding: 0.75rem 1rem; border: 1px solid var(--slate-300); border-radius: 0.75rem; color: var(--slate-900); transition: all .2s ease; }
.form-input:focus { outline: none; box-shadow: 0 0 0 2px rgba(59,130,246,0.6); border-color: transparent; }
.form-input::placeholder { color: var(--slate-400); }

.form-textarea { width: 100%; padding: 0.75rem 1rem; border: 1px solid var(--slate-300); border-radius: 0.75rem; transition: all .2s ease; color: var(--slate-900); resize: none; }
.form-textarea:focus { outline: none; box-shadow: 0 0 0 2px rgba(59,130,246,0.6); border-color: transparent; }
.form-textarea::placeholder { color: var(--slate-400); }

/* Progress indicators */
.progress-bar { width: 100%; background: var(--slate-200); border-radius: 9999px; height: 0.5rem; overflow: hidden; }

.progress-fill { height: 100%; background-image: linear-gradient(to right, var(--blue-500), var(--purple-500)); border-radius: 9999px; transition: all .5s ease; }

/* Modern alerts */
.alert { padding: 1rem; border-radius: 0.75rem; border: 1px solid #e5e7eb; }

.alert.success { background: #f0fdf4; border-color: #bbf7d0; color: #166534; }

.alert.warning { background: #fefce8; border-color: #fde68a; color: #854d0e; }

.alert.error { background: #fef2f2; border-color: #fecaca; color: #991b1b; }

.alert.info { background: #eff6ff; border-color: #bfdbfe; color: #1e40af; }