/**
 * xGrid Design Language 1.0 — Base
 *
 * Structural tokens, primitives, and shared components.
 * Domain colors stay in each PWA; this file is color-agnostic.
 *
 * Import order:
 *   1. xirs-colors.css (legacy color tokens)
 *   2. xgrid-base.css  (this file)
 *   3. xgrid-typography.css
 *   4. PWA's own CSS
 */

@layer xgrid-reset, xgrid-tokens, xgrid-base, xgrid-components;

/* ═══════════════════════════════════════════
 * TOKENS
 * ═══════════════════════════════════════════ */

@layer xgrid-tokens {
  :root {
    /* ── Semantic Color Roles (bridged from legacy xirs-colors.css) ── */
    --xgrid-color-primary: var(--xirs-mirs-primary, #4f46e5);
    --xgrid-color-primary-soft: #eef2ff;
    --xgrid-color-success: var(--xirs-success, #10b981);
    --xgrid-color-warning: var(--xirs-warning, #f59e0b);
    --xgrid-color-danger: var(--xirs-error, #ef4444);
    --xgrid-color-info: var(--xirs-info, #3b82f6);
    --xgrid-color-success-light: var(--xirs-success-light, #d1fae5);
    --xgrid-color-warning-light: var(--xirs-warning-light, #fef3c7);
    --xgrid-color-danger-light: var(--xirs-error-light, #fee2e2);
    --xgrid-color-info-light: var(--xirs-info-light, #dbeafe);

    /* ── Radius Scale ── */
    --xgrid-radius-sm: 6px;
    --xgrid-radius-md: 10px;
    --xgrid-radius-lg: 14px;
    --xgrid-radius-full: 9999px;

    /* ── Shadow Scale ── */
    --xgrid-shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --xgrid-shadow-md: 0 2px 8px -2px rgba(0,0,0,0.1);
    --xgrid-shadow-lg: 0 8px 24px -4px rgba(0,0,0,0.12);

    /* ── Spacing ── */
    --xgrid-card-padding: 16px;
    --xgrid-section-gap: 12px;

    /* ── Touch Target (operational requirement) ── */
    --xgrid-touch-min: 48px;
    --xgrid-touch-med: 56px;

    /* ── Transition ── */
    --xgrid-transition-fast: 150ms ease;
    --xgrid-transition-normal: 250ms ease;

    /* ── Surface (light mode default) ── */
    --xgrid-surface-bg: #f8fafc;
    --xgrid-surface-card: #ffffff;
    --xgrid-surface-border: #e2e8f0;
    --xgrid-surface-divider: #f1f5f9;

    /* ── Text ── */
    --xgrid-text-primary: #1e293b;
    --xgrid-text-secondary: #64748b;
    --xgrid-text-muted: #94a3b8;

    /* ── Density: comfortable (default) ── */
    --xgrid-density-card-padding: 16px;
    --xgrid-density-gap: 12px;
    --xgrid-density-row-height: 48px;
  }

  /* ── Dark Theme (centralized) ── */
  [data-theme="dark"],
  .xgrid-theme-dark {
    --xgrid-surface-bg: #0f172a;
    --xgrid-surface-card: #1e293b;
    --xgrid-surface-border: #334155;
    --xgrid-surface-divider: #1e293b;
    --xgrid-text-primary: #e2e8f0;
    --xgrid-text-secondary: #94a3b8;
    --xgrid-text-muted: #64748b;
    --xgrid-shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
    --xgrid-shadow-md: 0 2px 8px rgba(0,0,0,0.4);
    --xgrid-shadow-lg: 0 8px 24px rgba(0,0,0,0.5);
  }

  /* ── Density: compact ── */
  [data-density="compact"],
  .xgrid-density-compact {
    --xgrid-density-card-padding: 12px;
    --xgrid-density-gap: 8px;
    --xgrid-density-row-height: 40px;
  }

  /* ── Density: operational (field use, gloves) ── */
  [data-density="operational"],
  .xgrid-density-operational {
    --xgrid-density-card-padding: 20px;
    --xgrid-density-gap: 16px;
    --xgrid-density-row-height: 56px;
  }
}

/* ═══════════════════════════════════════════
 * BASE UTILITIES
 * ═══════════════════════════════════════════ */

@layer xgrid-base {
  /* ── Safe Area ── */
  .safe-area-bottom { padding-bottom: max(12px, env(safe-area-inset-bottom)); }
  .safe-area-top { padding-top: max(0px, env(safe-area-inset-top)); }

  /* ── Touch Feedback ── */
  .xgrid-touchable {
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
    transition: transform var(--xgrid-transition-fast), opacity var(--xgrid-transition-fast);
  }
  .xgrid-touchable:active { transform: scale(0.97); opacity: 0.85; }

  /* ── Focus Ring (accessibility) ── */
  :focus-visible {
    outline: 2px solid var(--xgrid-color-primary);
    outline-offset: 2px;
  }

  /* ── Scrollbar ── */
  ::-webkit-scrollbar { width: 4px; }
  ::-webkit-scrollbar-track { background: transparent; }
  ::-webkit-scrollbar-thumb { background: var(--xgrid-surface-border); border-radius: 2px; }

  /* ── Page Transition ── */
  .xgrid-page-enter {
    animation: xgrid-fadeInUp var(--xgrid-transition-normal) both;
  }
  @keyframes xgrid-fadeInUp {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
  }

  /* ── Reduced Motion ── */
  @media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
      animation-duration: 0.01ms !important;
      animation-iteration-count: 1 !important;
      transition-duration: 0.01ms !important;
      scroll-behavior: auto !important;
    }
  }
}

/* ═══════════════════════════════════════════
 * COMPONENTS
 * ═══════════════════════════════════════════ */

@layer xgrid-components {

  /* ── Cards ── */

  .xgrid-card {
    background: var(--xgrid-surface-card);
    border-radius: var(--xgrid-radius-md);
    padding: var(--xgrid-density-card-padding);
    box-shadow: var(--xgrid-shadow-sm);
    transition: box-shadow var(--xgrid-transition-fast);
  }

  /* Operational card: real-time actions, quick controls */
  .xgrid-card-ops {
    border-top: 3px solid var(--xgrid-color-primary);
    border-radius: 2px 2px var(--xgrid-radius-md) var(--xgrid-radius-md);
    box-shadow: 0 2px 12px -3px color-mix(in srgb, var(--xgrid-color-primary) 30%, transparent);
  }

  /* Data card: numbers, tables, metrics */
  .xgrid-card-data {
    composes: xgrid-card;
    padding-top: 12px;
    padding-bottom: 12px;
  }

  /* Context card: hints, metadata, lower priority */
  .xgrid-card-context {
    background: var(--xgrid-surface-divider);
    border-radius: var(--xgrid-radius-md);
    padding: 12px var(--xgrid-density-card-padding);
    box-shadow: none;
  }

  /* ── Buttons ── */

  .xgrid-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    min-height: var(--xgrid-touch-min);
    padding: 10px 20px;
    border-radius: var(--xgrid-radius-sm);
    font-size: 13px;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: all var(--xgrid-transition-fast);
    -webkit-tap-highlight-color: transparent;
  }
  .xgrid-btn:disabled { opacity: 0.5; cursor: not-allowed; }
  .xgrid-btn-sm { min-height: 36px; padding: 6px 14px; font-size: 11px; }
  .xgrid-btn-lg { min-height: var(--xgrid-touch-med); padding: 14px 24px; font-size: 15px; }

  .xgrid-btn-primary {
    background: var(--xgrid-color-primary);
    color: white;
  }
  .xgrid-btn-primary:hover { filter: brightness(1.1); }

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

  .xgrid-btn-ghost {
    background: transparent;
    color: var(--xgrid-color-primary);
  }
  .xgrid-btn-ghost:hover { background: var(--xgrid-surface-divider); }

  .xgrid-btn-danger {
    background: var(--xgrid-color-danger);
    color: white;
  }
  .xgrid-btn-danger:hover { filter: brightness(1.1); }

  /* ── Form Controls ── */

  .xgrid-field {
    margin-bottom: var(--xgrid-section-gap);
  }
  .xgrid-field-label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    color: var(--xgrid-text-secondary);
    margin-bottom: 4px;
  }
  .xgrid-input {
    width: 100%;
    min-height: var(--xgrid-touch-min);
    padding: 10px 14px;
    border: 1px solid var(--xgrid-surface-border);
    border-radius: var(--xgrid-radius-sm);
    font-size: 15px;
    color: var(--xgrid-text-primary);
    background: var(--xgrid-surface-card);
    transition: border-color var(--xgrid-transition-fast);
  }
  .xgrid-input:focus {
    border-color: var(--xgrid-color-primary);
    outline: none;
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--xgrid-color-primary) 15%, transparent);
  }
  .xgrid-input-error { border-color: var(--xgrid-color-danger); }
  .xgrid-helper-text {
    font-size: 11px;
    color: var(--xgrid-text-muted);
    margin-top: 4px;
  }
  .xgrid-error-text {
    font-size: 11px;
    color: var(--xgrid-color-danger);
    margin-top: 4px;
  }

  /* ── Badge ── */

  .xgrid-badge {
    display: inline-flex;
    align-items: center;
    padding: 2px 8px;
    border-radius: var(--xgrid-radius-full);
    font-size: 11px;
    font-weight: 600;
  }

  /* ── Loading ── */

  .xgrid-spinner {
    width: 24px;
    height: 24px;
    border: 3px solid var(--xgrid-surface-border);
    border-top-color: var(--xgrid-color-primary);
    border-radius: 50%;
    animation: xgrid-spin 0.6s linear infinite;
  }
  .xgrid-spinner-lg { width: 40px; height: 40px; border-width: 4px; }
  @keyframes xgrid-spin { to { transform: rotate(360deg); } }

  .xgrid-skeleton {
    background: linear-gradient(90deg, var(--xgrid-surface-divider) 25%, #e8ecf1 50%, var(--xgrid-surface-divider) 75%);
    background-size: 200% 100%;
    animation: xgrid-shimmer 1.5s infinite;
    border-radius: var(--xgrid-radius-sm);
  }
  @keyframes xgrid-shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
  }

  /* ── Empty State ── */

  .xgrid-empty {
    text-align: center;
    padding: 40px 20px;
    color: var(--xgrid-text-muted);
  }
  .xgrid-empty-icon {
    width: 48px;
    height: 48px;
    margin: 0 auto 12px;
    opacity: 0.4;
  }
  .xgrid-empty-text {
    font-size: 14px;
  }

  /* ── State Banners ── */

  .xgrid-state-banner {
    padding: 10px 16px;
    border-radius: var(--xgrid-radius-sm);
    font-size: 13px;
    display: flex;
    align-items: center;
    gap: 8px;
  }
  .xgrid-state-success { background: var(--xgrid-color-success-light); color: #065f46; }
  .xgrid-state-warning { background: var(--xgrid-color-warning-light); color: #92400e; }
  .xgrid-state-error   { background: var(--xgrid-color-danger-light); color: #991b1b; }
  .xgrid-state-info    { background: var(--xgrid-color-info-light); color: #1e40af; }
  .xgrid-state-offline {
    background: #fef3c7;
    color: #92400e;
    border: 1px dashed #d97706;
  }
}