/* Claude.ai-inspired Design System */
:root {
  /* Colors - Claude palette */
  --claude-bg: #1a1a1a;
  --claude-surface: #2a2a2a;
  --claude-surface-hover: #333333;
  --claude-border: rgba(255, 255, 255, 0.08);
  --claude-text-primary: #f5f5f5;
  --claude-text-secondary: #a8a8a8;
  --claude-text-tertiary: #6b6b6b;
  --claude-accent: #d97706;
  --claude-accent-hover: #ea580c;
  --claude-success: #10b981;
  --claude-error: #ef4444;

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, monospace;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-12: 3rem;

  /* Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: var(--font-sans);
  background: var(--claude-bg);
  color: var(--claude-text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 500;
  line-height: 1;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: none;
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary {
  background: var(--claude-accent);
  color: white;
}

.btn-primary:hover {
  background: var(--claude-accent-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

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

.btn-secondary:hover {
  background: var(--claude-surface-hover);
}

.btn-ghost {
  background: transparent;
  color: var(--claude-text-secondary);
}

.btn-ghost:hover {
  background: var(--claude-surface);
  color: var(--claude-text-primary);
}

/* Inputs */
.input {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  background: var(--claude-surface);
  border: 1px solid var(--claude-border);
  border-radius: var(--radius-md);
  color: var(--claude-text-primary);
  font-size: 0.875rem;
  font-family: var(--font-sans);
  transition: all var(--transition-fast);
}

.input:focus {
  outline: none;
  border-color: var(--claude-accent);
  box-shadow: 0 0 0 3px rgba(217, 119, 6, 0.1);
}

.input::placeholder {
  color: var(--claude-text-tertiary);
}

/* Cards */
.card {
  background: var(--claude-surface);
  border: 1px solid var(--claude-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition: all var(--transition-base);
}

.card:hover {
  border-color: rgba(255, 255, 255, 0.12);
  box-shadow: var(--shadow-lg);
}

/* Glass effect */
.glass {
  background: rgba(42, 42, 42, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--claude-border);
}

/* Typography */
.text-primary { color: var(--claude-text-primary); }
.text-secondary { color: var(--claude-text-secondary); }
.text-tertiary { color: var(--claude-text-tertiary); }

/* Utilities */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: var(--space-2); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }

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

.animate-in {
  animation: fadeIn 0.3s ease-out;
}