/* ==========================================================
   MeHome Design System — Phase 6A
   Reusable, responsive UI primitives. Prefix: mh-
   ========================================================== */
:root {
  --mh-font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --mh-font-display: var(--mh-font-sans);
  --mh-primary: #2563eb;
  --mh-primary-hover: #1d4ed8;
  --mh-primary-soft: #eff6ff;
  --mh-success: #16a34a;
  --mh-success-soft: #f0fdf4;
  --mh-warning: #d97706;
  --mh-warning-soft: #fffbeb;
  --mh-danger: #dc2626;
  --mh-danger-soft: #fef2f2;
  --mh-info: #0284c7;
  --mh-info-soft: #f0f9ff;
  --mh-text: #0f172a;
  --mh-text-2: #334155;
  --mh-muted: #64748b;
  --mh-subtle: #94a3b8;
  --mh-border: #e2e8f0;
  --mh-border-strong: #cbd5e1;
  --mh-surface: #fff;
  --mh-surface-2: #f8fafc;
  --mh-bg: #f5f7fb;
  --mh-radius-sm: 8px;
  --mh-radius-md: 12px;
  --mh-radius-lg: 16px;
  --mh-radius-xl: 20px;
  --mh-shadow-sm: 0 1px 3px rgba(15,23,42,.06), 0 1px 2px rgba(15,23,42,.04);
  --mh-shadow-md: 0 8px 24px rgba(15,23,42,.08);
  --mh-shadow-lg: 0 18px 50px rgba(15,23,42,.14);
  --mh-focus: 0 0 0 3px rgba(37,99,235,.16);
  --mh-container: 1500px;
  --mh-transition: 160ms ease;
}

.mh-ui, .mh-ui * { font-family: var(--mh-font-sans); }
.mh-container { width: min(100% - 32px, var(--mh-container)); margin-inline: auto; }
.mh-stack { display:flex; flex-direction:column; gap:16px; }
.mh-row { display:flex; align-items:center; gap:12px; flex-wrap:wrap; }
.mh-grid { display:grid; gap:16px; }
.mh-grid-2 { grid-template-columns:repeat(2,minmax(0,1fr)); }
.mh-grid-3 { grid-template-columns:repeat(3,minmax(0,1fr)); }
.mh-grid-4 { grid-template-columns:repeat(4,minmax(0,1fr)); }

/* Typography */
.mh-display { font-size:clamp(28px,4vw,44px); line-height:1.08; font-weight:800; letter-spacing:-.035em; color:var(--mh-text); }
.mh-h1 { font-size:clamp(24px,3vw,32px); line-height:1.15; font-weight:800; letter-spacing:-.025em; color:var(--mh-text); }
.mh-h2 { font-size:clamp(20px,2.4vw,26px); line-height:1.2; font-weight:800; color:var(--mh-text); }
.mh-h3 { font-size:18px; line-height:1.3; font-weight:750; color:var(--mh-text); }
.mh-title { font-size:16px; line-height:1.35; font-weight:700; color:var(--mh-text); }
.mh-body { font-size:14px; line-height:1.65; color:var(--mh-text-2); }
.mh-small { font-size:12px; line-height:1.5; color:var(--mh-muted); }
.mh-caption { font-size:11px; line-height:1.4; color:var(--mh-subtle); }
.mh-price { font-size:18px; line-height:1.2; font-weight:800; color:var(--mh-text); font-variant-numeric:tabular-nums; }
.mh-link { color:var(--mh-primary); font-weight:650; text-decoration:none; }
.mh-link:hover { text-decoration:underline; }

/* Buttons */
.mh-btn { --mh-btn-bg:var(--mh-primary); --mh-btn-color:#fff; --mh-btn-border:transparent; display:inline-flex; align-items:center; justify-content:center; gap:8px; min-height:42px; padding:0 16px; border:1px solid var(--mh-btn-border); border-radius:var(--mh-radius-sm); background:var(--mh-btn-bg); color:var(--mh-btn-color); font:700 13px/1 var(--mh-font-sans); text-decoration:none; cursor:pointer; transition:transform var(--mh-transition), background var(--mh-transition), box-shadow var(--mh-transition), border-color var(--mh-transition); }
.mh-btn:hover { background:var(--mh-primary-hover); transform:translateY(-1px); box-shadow:var(--mh-shadow-sm); }
.mh-btn:active { transform:translateY(0); }
.mh-btn:focus-visible { outline:0; box-shadow:var(--mh-focus); }
.mh-btn:disabled, .mh-btn[aria-disabled="true"] { opacity:.55; cursor:not-allowed; transform:none; box-shadow:none; }
.mh-btn-sm { min-height:36px; padding:0 12px; font-size:12px; }
.mh-btn-lg { min-height:48px; padding:0 20px; font-size:14px; }
.mh-btn-block { width:100%; }
.mh-btn-secondary { --mh-btn-bg:#fff; --mh-btn-color:var(--mh-text-2); --mh-btn-border:var(--mh-border); }
.mh-btn-secondary:hover { background:var(--mh-surface-2); }
.mh-btn-ghost { --mh-btn-bg:transparent; --mh-btn-color:var(--mh-text-2); --mh-btn-border:transparent; }
.mh-btn-ghost:hover { background:var(--mh-surface-2); }
.mh-btn-danger { --mh-btn-bg:var(--mh-danger); --mh-btn-color:#fff; }
.mh-btn-success { --mh-btn-bg:var(--mh-success); --mh-btn-color:#fff; }
.mh-btn-warning { --mh-btn-bg:var(--mh-warning); --mh-btn-color:#fff; }
.mh-btn-icon { width:42px; padding:0; }

/* Cards */
.mh-card { background:var(--mh-surface); border:1px solid var(--mh-border); border-radius:var(--mh-radius-md); box-shadow:var(--mh-shadow-sm); }
.mh-card-pad { padding:20px; }
.mh-card-hover { transition:transform var(--mh-transition), box-shadow var(--mh-transition), border-color var(--mh-transition); }
.mh-card-hover:hover { transform:translateY(-2px); box-shadow:var(--mh-shadow-md); border-color:var(--mh-border-strong); }
.mh-card-header { display:flex; align-items:flex-start; justify-content:space-between; gap:16px; padding:18px 20px; border-bottom:1px solid var(--mh-border); }
.mh-card-body { padding:20px; }
.mh-card-footer { padding:14px 20px; border-top:1px solid var(--mh-border); background:var(--mh-surface-2); border-radius:0 0 var(--mh-radius-md) var(--mh-radius-md); }

/* Forms */
.mh-form-group { display:flex; flex-direction:column; gap:7px; }
.mh-label { font-size:12px; font-weight:700; color:var(--mh-text-2); }
.mh-required::after { content:' *'; color:var(--mh-danger); }
.mh-input, .mh-select, .mh-textarea { width:100%; min-height:44px; border:1px solid var(--mh-border-strong); border-radius:var(--mh-radius-sm); background:#fff; color:var(--mh-text); font:500 13px/1.4 var(--mh-font-sans); padding:10px 12px; outline:0; transition:border-color var(--mh-transition), box-shadow var(--mh-transition); }
.mh-textarea { min-height:110px; resize:vertical; }
.mh-input::placeholder, .mh-textarea::placeholder { color:#a1adbd; }
.mh-input:focus, .mh-select:focus, .mh-textarea:focus { border-color:var(--mh-primary); box-shadow:var(--mh-focus); }
.mh-input[aria-invalid="true"], .mh-select[aria-invalid="true"], .mh-textarea[aria-invalid="true"] { border-color:var(--mh-danger); box-shadow:0 0 0 3px rgba(220,38,38,.10); }
.mh-help { font-size:11px; color:var(--mh-muted); }
.mh-error { font-size:11px; font-weight:600; color:var(--mh-danger); }
.mh-input-group { display:flex; align-items:stretch; }
.mh-input-group .mh-input { border-radius:var(--mh-radius-sm) 0 0 var(--mh-radius-sm); }
.mh-input-addon { display:flex; align-items:center; padding:0 12px; border:1px solid var(--mh-border-strong); background:var(--mh-surface-2); color:var(--mh-muted); font-size:12px; }
.mh-input-addon:first-child { border-radius:var(--mh-radius-sm) 0 0 var(--mh-radius-sm); border-right:0; }
.mh-input-addon:last-child { border-radius:0 var(--mh-radius-sm) var(--mh-radius-sm) 0; border-left:0; }

/* Badges / status */
.mh-badge { display:inline-flex; align-items:center; justify-content:center; gap:5px; min-height:24px; padding:0 9px; border-radius:999px; background:var(--mh-surface-2); color:var(--mh-text-2); font-size:11px; font-weight:750; white-space:nowrap; }
.mh-badge-success { background:var(--mh-success-soft); color:#15803d; }
.mh-badge-warning { background:var(--mh-warning-soft); color:#b45309; }
.mh-badge-danger { background:var(--mh-danger-soft); color:#b91c1c; }
.mh-badge-info { background:var(--mh-info-soft); color:#0369a1; }
.mh-badge-primary { background:var(--mh-primary-soft); color:#1d4ed8; }
.mh-dot { width:7px; height:7px; border-radius:50%; background:currentColor; }

/* Tables */
.mh-table-wrap { width:100%; overflow:auto; -webkit-overflow-scrolling:touch; border:1px solid var(--mh-border); border-radius:var(--mh-radius-md); background:#fff; }
.mh-table { width:100%; border-collapse:collapse; min-width:680px; font-size:12px; }
.mh-table th { padding:12px 14px; text-align:left; background:var(--mh-surface-2); border-bottom:1px solid var(--mh-border); color:var(--mh-muted); font-size:10px; font-weight:800; text-transform:uppercase; letter-spacing:.04em; white-space:nowrap; }
.mh-table td { padding:14px; border-bottom:1px solid var(--mh-border); color:var(--mh-text-2); vertical-align:middle; }
.mh-table tbody tr:last-child td { border-bottom:0; }
.mh-table tbody tr:hover td { background:#fafcff; }
.mh-table .mh-num { text-align:right; font-variant-numeric:tabular-nums; }

/* Modal */
.mh-modal-backdrop { position:fixed; inset:0; z-index:5000; display:none; align-items:center; justify-content:center; padding:16px; background:rgba(15,23,42,.55); backdrop-filter:blur(3px); }
.mh-modal-backdrop.is-open { display:flex; }
.mh-modal { width:min(100%,560px); max-height:min(90vh,760px); overflow:auto; background:#fff; border:1px solid rgba(255,255,255,.5); border-radius:var(--mh-radius-lg); box-shadow:var(--mh-shadow-lg); }
.mh-modal-lg { width:min(100%,820px); }
.mh-modal-header { display:flex; align-items:flex-start; justify-content:space-between; gap:16px; padding:18px 20px; border-bottom:1px solid var(--mh-border); }
.mh-modal-body { padding:20px; }
.mh-modal-footer { display:flex; justify-content:flex-end; gap:10px; padding:14px 20px; border-top:1px solid var(--mh-border); background:var(--mh-surface-2); }
.mh-modal-close { flex:0 0 auto; border:0; background:transparent; color:var(--mh-muted); cursor:pointer; width:34px; height:34px; border-radius:8px; font-size:20px; }
.mh-modal-close:hover { background:var(--mh-border); color:var(--mh-text); }

/* Toast */
.mh-toast-region { position:fixed; z-index:7000; top:18px; right:18px; display:flex; flex-direction:column; gap:10px; width:min(380px,calc(100vw - 36px)); pointer-events:none; }
.mh-toast { pointer-events:auto; display:grid; grid-template-columns:auto 1fr auto; gap:10px; align-items:start; padding:13px 14px; background:#fff; border:1px solid var(--mh-border); border-radius:var(--mh-radius-md); box-shadow:var(--mh-shadow-lg); animation:mh-toast-in .18s ease both; }
.mh-toast-icon { font-weight:800; }
.mh-toast-title { font-size:12px; font-weight:800; color:var(--mh-text); }
.mh-toast-message { margin-top:2px; font-size:11px; line-height:1.45; color:var(--mh-muted); }
.mh-toast-close { border:0; background:transparent; color:var(--mh-subtle); cursor:pointer; }
.mh-toast-success .mh-toast-icon { color:var(--mh-success); }
.mh-toast-error .mh-toast-icon { color:var(--mh-danger); }
.mh-toast-warning .mh-toast-icon { color:var(--mh-warning); }
.mh-toast-info .mh-toast-icon { color:var(--mh-info); }
@keyframes mh-toast-in { from { opacity:0; transform:translateY(-6px); } to { opacity:1; transform:none; } }

/* Alerts */
.mh-alert { display:flex; align-items:flex-start; gap:10px; padding:13px 14px; border:1px solid var(--mh-border); border-radius:var(--mh-radius-md); font-size:12px; line-height:1.5; }
.mh-alert-title { display:block; margin-bottom:2px; font-weight:800; color:inherit; }
.mh-alert-success { background:var(--mh-success-soft); border-color:#bbf7d0; color:#166534; }
.mh-alert-warning { background:var(--mh-warning-soft); border-color:#fde68a; color:#92400e; }
.mh-alert-danger { background:var(--mh-danger-soft); border-color:#fecaca; color:#991b1b; }
.mh-alert-info { background:var(--mh-info-soft); border-color:#bae6fd; color:#075985; }

/* Loading */
.mh-spinner { width:20px; height:20px; border:2px solid #dbeafe; border-top-color:var(--mh-primary); border-radius:50%; animation:mh-spin .7s linear infinite; }
.mh-spinner-sm { width:15px; height:15px; border-width:2px; }
.mh-loading { display:inline-flex; align-items:center; justify-content:center; gap:9px; color:var(--mh-muted); font-size:12px; }
.mh-loading-overlay { position:fixed; inset:0; z-index:6500; display:none; align-items:center; justify-content:center; background:rgba(248,250,252,.72); backdrop-filter:blur(2px); }
.mh-loading-overlay.is-visible { display:flex; }
.mh-loading-box { display:flex; flex-direction:column; align-items:center; gap:10px; padding:20px 24px; border:1px solid var(--mh-border); border-radius:var(--mh-radius-md); background:#fff; box-shadow:var(--mh-shadow-md); }
@keyframes mh-spin { to { transform:rotate(360deg); } }

/* Empty state */
.mh-empty { min-height:260px; display:flex; flex-direction:column; align-items:center; justify-content:center; text-align:center; padding:32px 20px; border:1px dashed var(--mh-border-strong); border-radius:var(--mh-radius-md); background:linear-gradient(180deg,#fff,#fbfdff); }
.mh-empty-icon { width:52px; height:52px; display:grid; place-items:center; margin-bottom:12px; border-radius:50%; background:var(--mh-surface-2); color:var(--mh-subtle); font-size:22px; }
.mh-empty-title { margin:0 0 5px; font-size:16px; font-weight:800; color:var(--mh-text); }
.mh-empty-text { max-width:440px; margin:0 0 16px; font-size:12px; line-height:1.55; color:var(--mh-muted); }

/* Skeleton */
.mh-skeleton { position:relative; overflow:hidden; background:#e9eef5; border-radius:var(--mh-radius-sm); }
.mh-skeleton::after { content:""; position:absolute; inset:0; transform:translateX(-100%); background:linear-gradient(90deg,transparent,rgba(255,255,255,.72),transparent); animation:mh-shimmer 1.25s infinite; }
.mh-skeleton-text { height:11px; width:100%; }
.mh-skeleton-title { height:18px; width:62%; }
.mh-skeleton-avatar { width:44px; height:44px; border-radius:50%; }
.mh-skeleton-image { aspect-ratio:1/1; width:100%; }
@keyframes mh-shimmer { 100% { transform:translateX(100%); } }

/* Accessibility / responsive primitives */
.mh-visually-hidden { position:absolute!important; width:1px!important; height:1px!important; padding:0!important; margin:-1px!important; overflow:hidden!important; clip:rect(0,0,0,0)!important; white-space:nowrap!important; border:0!important; }
.mh-divider { height:1px; background:var(--mh-border); border:0; margin:0; }
.mh-muted { color:var(--mh-muted)!important; }
.mh-nowrap { white-space:nowrap; }

@media (max-width: 992px) {
  .mh-grid-4 { grid-template-columns:repeat(2,minmax(0,1fr)); }
  .mh-grid-3 { grid-template-columns:repeat(2,minmax(0,1fr)); }
}
@media (max-width: 640px) {
  .mh-container { width:min(100% - 24px, var(--mh-container)); }
  .mh-grid-2, .mh-grid-3, .mh-grid-4 { grid-template-columns:1fr; }
  .mh-card-header, .mh-card-body { padding:16px; }
  .mh-card-footer { padding:12px 16px; }
  .mh-modal-backdrop { padding:10px; align-items:flex-end; }
  .mh-modal { width:100%; max-height:92vh; border-radius:16px 16px 10px 10px; }
  .mh-modal-header, .mh-modal-body { padding:16px; }
  .mh-modal-footer { padding:12px 16px; }
  .mh-modal-footer .mh-btn { flex:1; }
  .mh-btn:not(.mh-btn-icon) { min-height:44px; }
  .mh-toast-region { top:12px; right:12px; left:12px; width:auto; }
  .mh-empty { min-height:220px; }
}
@media (prefers-reduced-motion: reduce) {
  .mh-card-hover, .mh-btn { transition:none; }
  .mh-skeleton::after, .mh-spinner, .mh-toast { animation:none; }
}