/**
 * BotPiper Provisional Design Tokens
 * Based on VOICE.md brand guidelines
 * 
 * NOTE: Replace with Pixel's design-system.css when ready
 * Created: 2026-02-23 by Nova
 */

:root {
  /* === Brand Colors === */
  --bp-primary: #1D1A4E;
  --bp-secondary: #F38249;
  --bp-text: #47465E;
  --bp-text-light: #626176;
  --bp-accent: #332E8F;
  --bp-accent-light: #3D36AA;
  --bp-accent-deep: #2F2A81;
  --bp-warning: #F3B849;
  --bp-error: #D33A46;
  --bp-orange-light: #F8CBB4;
  --bp-bg: #FEFBF8;
  --bp-surface: #FDF5F1;
  --bp-border: #C5C5CD;
  
  /* === Semantic Colors === */
  --color-primary: var(--bp-primary);
  --color-primary-hover: var(--bp-accent-deep);
  --color-secondary: var(--bp-secondary);
  --color-secondary-hover: #e07339;
  --color-text: var(--bp-text);
  --color-text-muted: var(--bp-text-light);
  --color-background: var(--bp-bg);
  --color-surface: var(--bp-surface);
  --color-border: var(--bp-border);
  --color-error: var(--bp-error);
  --color-warning: var(--bp-warning);
  --color-success: #10b981;
  
  /* === Typography === */
  --font-family-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 
    'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-size-xs: 0.75rem;    /* 12px */
  --font-size-sm: 0.875rem;   /* 14px */
  --font-size-base: 1rem;     /* 16px */
  --font-size-lg: 1.125rem;   /* 18px */
  --font-size-xl: 1.25rem;    /* 20px */
  --font-size-2xl: 1.5rem;    /* 24px */
  --font-size-3xl: 1.875rem;  /* 30px */
  --font-size-4xl: 2.25rem;   /* 36px */
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;
  
  /* === Spacing Scale (4px base) === */
  --spacing-0: 0;
  --spacing-1: 0.25rem;   /* 4px */
  --spacing-2: 0.5rem;    /* 8px */
  --spacing-3: 0.75rem;   /* 12px */
  --spacing-4: 1rem;      /* 16px */
  --spacing-5: 1.25rem;   /* 20px */
  --spacing-6: 1.5rem;    /* 24px */
  --spacing-8: 2rem;      /* 32px */
  --spacing-10: 2.5rem;   /* 40px */
  --spacing-12: 3rem;     /* 48px */
  --spacing-16: 4rem;     /* 64px */
  
  /* === Border Radius === */
  --radius-sm: 0.25rem;   /* 4px */
  --radius-md: 0.375rem;  /* 6px */
  --radius-lg: 0.5rem;    /* 8px */
  --radius-xl: 0.75rem;   /* 12px */
  --radius-2xl: 1rem;     /* 16px */
  --radius-full: 9999px;
  
  /* === 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);
  
  /* === Transitions === */
  --transition-fast: 150ms ease;
  --transition-normal: 200ms ease;
  --transition-slow: 300ms ease;
  
  /* === Breakpoints (for reference) === */
  /* Mobile: 320px */
  /* Tablet: 768px */
  /* Desktop: 1024px */
  /* Large: 1280px */
  /* XL: 1440px */
}

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

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family-sans);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--color-text);
  background-color: var(--color-background);
}

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

/* === Button Base === */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-2);
  padding: var(--spacing-3) var(--spacing-5);
  font-family: inherit;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  line-height: 1;
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn:focus {
  outline: 2px solid var(--bp-accent-light);
  outline-offset: 2px;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
  background-color: var(--color-primary-hover);
}

.btn-secondary {
  background-color: var(--color-secondary);
  color: white;
}

.btn-secondary:hover:not(:disabled) {
  background-color: var(--color-secondary-hover);
}

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

.btn-ghost:hover:not(:disabled) {
  background-color: var(--color-surface);
}

.btn-danger {
  background-color: var(--color-error);
  color: white;
}

.btn-danger:hover:not(:disabled) {
  background-color: #b83240;
}

.btn-lg {
  padding: var(--spacing-4) var(--spacing-6);
  font-size: var(--font-size-base);
}

.btn-sm {
  padding: var(--spacing-2) var(--spacing-3);
  font-size: var(--font-size-xs);
}

.btn-block {
  width: 100%;
}

/* === Form Elements === */
.form-group {
  margin-bottom: var(--spacing-4);
}

.form-label {
  display: block;
  margin-bottom: var(--spacing-2);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text);
}

.form-input {
  width: 100%;
  padding: var(--spacing-3);
  font-family: inherit;
  font-size: var(--font-size-base);
  color: var(--color-text);
  background-color: white;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-input:focus {
  outline: none;
  border-color: var(--bp-accent-light);
  box-shadow: 0 0 0 3px rgba(61, 54, 170, 0.1);
}

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

.form-input.error {
  border-color: var(--color-error);
}

.form-error {
  margin-top: var(--spacing-1);
  font-size: var(--font-size-sm);
  color: var(--color-error);
}

.form-hint {
  margin-top: var(--spacing-1);
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

/* === Card === */
.card {
  background-color: white;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
}

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

/* === Link === */
.link {
  color: var(--bp-accent-light);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.link:hover {
  color: var(--bp-accent);
  text-decoration: underline;
}

/* === Skeleton Loader === */
.skeleton {
  background: linear-gradient(
    90deg,
    #e5e7eb 25%,
    #f3f4f6 50%,
    #e5e7eb 75%
  );
  background-size: 200% 100%;
  animation: skeleton-loading 1.5s ease-in-out infinite;
  border-radius: var(--radius-sm);
}

@keyframes skeleton-loading {
  0% {
    background-position: 200% 0;
  }
  100% {
    background-position: -200% 0;
  }
}

/* === Inline Spinner === */
.spinner {
  display: inline-block;
  width: 1em;
  height: 1em;
  border: 2px solid currentColor;
  border-right-color: transparent;
  border-radius: var(--radius-full);
  animation: spin 0.75s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* === Reduced Motion === */
@media (prefers-reduced-motion: reduce) {
  .skeleton,
  .spinner {
    animation: none;
  }
  
  .skeleton {
    background: #e5e7eb;
  }
}