/* Shared UI primitives: button, status chip, form field, skeleton, empty state,
   page shell chrome, top bar, and utility classes. These are the components the
   route/view matrix and component inventory describe. Every view imports this
   after tokens.css.

   See docs/product/frontend/03-component-inventory.md for the full state
   specification. States not shown here (loading, error, offline, permission)
   are handled inline in views where they are view-specific. */

/* ---- Reset / base (lightweight, no full reset) ---- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-fg);
  background: var(--color-bg);
  margin: 0;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
a { color: var(--color-accent); text-decoration: none; }
a:hover { text-decoration: underline; }
:focus-visible { outline: 3px solid var(--color-focus); outline-offset: 2px; border-radius: var(--radius-sm); }
img { max-width: 100%; height: auto; }
button { cursor: pointer; font: inherit; color: inherit; }
input, select, textarea { font: inherit; color: inherit; }

/* ---- Utility: hide ---- */
.ac-hidden { display: none !important; }

/* ---- Skip link ---- */
.ac-skip-link {
  position: absolute;
  left: var(--space-2);
  top: var(--space-2);
  z-index: 100;
  padding: var(--space-2) var(--space-3);
  background: var(--color-accent);
  color: var(--color-accent-fg);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: 500;
  text-decoration: none;
  box-shadow: var(--shadow-md);
}
.ac-skip-link:focus {
  outline: 3px solid var(--color-focus);
  outline-offset: 2px;
}

/* ---- Button ---- */
.ac-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-weight: 500;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  line-height: 1.4;
  transition: background-color var(--motion-fast) var(--motion-ease),
              border-color var(--motion-fast) var(--motion-ease),
              color var(--motion-fast) var(--motion-ease);
  white-space: nowrap;
  text-align: center;
  cursor: pointer;
}
.ac-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}
/* primary */
.ac-btn-primary {
  background: var(--color-accent);
  color: var(--color-accent-fg);
  border-color: var(--color-accent);
}
.ac-btn-primary:hover:not(:disabled) {
  background: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
  text-decoration: none;
}
/* secondary */
.ac-btn-secondary {
  background: transparent;
  color: var(--color-fg);
  border-color: var(--color-border-strong);
}
.ac-btn-secondary:hover:not(:disabled) {
  background: var(--color-hover);
  border-color: var(--color-fg-muted);
  text-decoration: none;
}
/* ghost */
.ac-btn-ghost {
  background: transparent;
  color: var(--color-fg-muted);
  border-color: transparent;
}
.ac-btn-ghost:hover:not(:disabled) {
  background: var(--color-hover);
  color: var(--color-fg);
  text-decoration: none;
}
/* danger */
.ac-btn-danger {
  background: transparent;
  color: var(--color-status-error);
  border-color: var(--color-status-error);
}
.ac-btn-danger:hover:not(:disabled) {
  background: var(--color-status-error-soft);
  text-decoration: none;
}
/* sizes */
.ac-btn-compact { padding: var(--space-1) var(--space-3); font-size: var(--text-xs); }
/* loading state: spinner replaces visible label; label kept for a11y */
.ac-btn-loading { position: relative; color: transparent; }
.ac-btn-loading::after {
  content: "";
  position: absolute;
  inset: 0;
  margin: auto;
  width: 1rem;
  height: 1rem;
  border: 2px solid currentColor;
  border-top-color: transparent;
  border-radius: 50%;
  animation: ac-spin 0.6s linear infinite;
}
@keyframes ac-spin { to { transform: rotate(360deg); } }

/* ---- Status chip ---- */
.ac-chip {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--text-xs);
  font-weight: 500;
  line-height: 1.4;
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  white-space: nowrap;
}
.ac-chip-success { background: var(--color-status-success-soft); color: var(--color-status-success); border-color: transparent; }
.ac-chip-warning { background: var(--color-status-warning-soft); color: var(--color-status-warning); border-color: transparent; }
.ac-chip-error   { background: var(--color-status-error-soft);   color: var(--color-status-error);   border-color: transparent; }
.ac-chip-info    { background: var(--color-status-info-soft);    color: var(--color-status-info);    border-color: transparent; }
.ac-chip-neutral { background: var(--color-status-neutral-soft); color: var(--color-status-neutral); border-color: transparent; }

/* ---- Form field ---- */
.ac-field { display: flex; flex-direction: column; gap: var(--space-1); }
.ac-label { font-size: var(--text-sm); font-weight: 500; color: var(--color-fg); }
.ac-hint { font-size: var(--text-xs); color: var(--color-fg-muted); }
.ac-error { font-size: var(--text-xs); color: var(--color-status-error); }
.ac-input {
  width: 100%;
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-base);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-md);
  background: var(--color-bg);
  color: var(--color-fg);
  transition: border-color var(--motion-fast) var(--motion-ease), box-shadow var(--motion-fast) var(--motion-ease);
}
.ac-input:focus {
  outline: none;
  border-color: var(--color-focus);
  box-shadow: 0 0 0 3px var(--color-accent-soft);
}
.ac-input-error { border-color: var(--color-status-error); }
.ac-input-error:focus { box-shadow: 0 0 0 3px var(--color-status-error-soft); }
.ac-input:disabled { background: var(--color-bg-subtle); color: var(--color-fg-subtle); cursor: not-allowed; }
.ac-select {
  appearance: none;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%235b6472' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'><polyline points='6 9 12 15 18 9'/></svg>");
  background-repeat: no-repeat;
  background-position: right var(--space-3) center;
  padding-right: var(--space-6);
}

/* ---- Skeleton ---- */
.ac-skeleton {
  background: var(--color-border);
  border-radius: var(--radius-sm);
  animation: ac-shimmer 1.4s ease-in-out infinite;
  background-image: linear-gradient(90deg, var(--color-border) 0%, var(--color-bg-subtle) 50%, var(--color-border) 100%);
  background-size: 200% 100%;
}
@keyframes ac-shimmer { 0% { background-position: 200% 0; } 100% { background-position: -200% 0; } }
.ac-skeleton-text { height: 0.85em; border-radius: var(--radius-sm); }
.ac-skeleton-circle { border-radius: 50%; }

/* Respect reduced motion: no shimmer animation, just a static skeleton tint. */
@media (prefers-reduced-motion: reduce) {
  .ac-skeleton {
    animation: none;
    background-image: linear-gradient(90deg, var(--color-border) 0%, var(--color-bg-subtle) 50%, var(--color-border) 100%);
    background-size: 200% 100%;
    background-position: 0 0;
  }
}

/* ---- Empty state ---- */
.ac-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-8) var(--space-4);
  gap: var(--space-2);
}
.ac-empty-icon { width: 2.5rem; height: 2.5rem; color: var(--color-fg-muted); margin-bottom: var(--space-1); }
.ac-empty-heading { font-size: var(--text-lg); font-weight: 600; color: var(--color-fg); margin: 0; }
.ac-empty-body { font-size: var(--text-sm); color: var(--color-fg-muted); margin: 0; max-width: 32rem; }

/* ---- Page-level error banner ---- */
.ac-banner {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  line-height: 1.5;
  margin-bottom: var(--space-4);
}
.ac-banner-error { background: var(--color-status-error-soft); color: var(--color-status-error); border: 1px solid var(--color-status-error); }
.ac-banner-warning { background: var(--color-status-warning-soft); color: var(--color-status-warning); border: 1px solid var(--color-status-warning); }
.ac-banner-info { background: var(--color-status-info-soft); color: var(--color-status-info); border: 1px solid var(--color-border); }
.ac-banner-body { flex: 1; }
.ac-banner-title { font-weight: 600; margin-bottom: var(--space-1); }
.ac-banner-actions { display: flex; gap: var(--space-2); margin-top: var(--space-2); flex-wrap: wrap; }

/* ---- Page shell chrome ---- */
.ac-page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ---- Top bar (app shell) ---- */
.ac-topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  flex-wrap: wrap;
}
.ac-topbar-brand { display: flex; align-items: center; gap: var(--space-2); font-weight: 600; font-size: var(--text-base); color: var(--color-fg); }
.ac-topbar-brand-mark { width: 1.6rem; height: 1.6rem; }
.ac-topbar-spacer { flex: 1; }
.ac-topbar-nav { display: flex; align-items: center; gap: var(--space-1); }
.ac-topbar-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-2);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-fg-muted);
  border-radius: var(--radius-md);
  transition: background-color var(--motion-fast) var(--motion-ease), color var(--motion-fast) var(--motion-ease);
}
.ac-topbar-link:hover { background: var(--color-hover); color: var(--color-fg); text-decoration: none; }
.ac-topbar-link.active { color: var(--color-accent); background: var(--color-accent-soft); }

/* ---- Content area ---- */
.ac-content {
  flex: 1;
  padding: var(--space-6) var(--space-4);
  max-width: 960px;
  margin: 0 auto;
  width: 100%;
}

/* ---- Footer (minimal in-app) ---- */
.ac-footer {
  padding: var(--space-4);
  border-top: 1px solid var(--color-border);
  font-size: var(--text-xs);
  color: var(--color-fg-muted);
  text-align: center;
}

/* ---- Data table (shared) ---- */
.ac-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
}
.ac-table th {
  text-align: left;
  font-weight: 600;
  color: var(--color-fg-muted);
  padding: var(--space-2) var(--space-3);
  border-bottom: 1px solid var(--color-border);
  white-space: nowrap;
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.02em;
}
.ac-table td {
  padding: var(--space-2) var(--space-3);
  border-bottom: 1px solid var(--color-border);
  vertical-align: top;
}
.ac-table tbody tr:hover { background: var(--color-bg-subtle); }
.ac-table-wrap { overflow-x: auto; }

/* ---- Mono text ---- */
.ac-mono { font-family: var(--font-mono); font-size: var(--text-xs); }

/* ---- Spacer ---- */
.ac-gap-1 { gap: var(--space-1); }
.ac-gap-2 { gap: var(--space-2); }
.ac-gap-3 { gap: var(--space-3); }
.ac-gap-4 { gap: var(--space-4); }

/* ---- Responsive helpers ---- */
@media (max-width: 640px) {
  .ac-content { padding: var(--space-4) var(--space-3); }
  .ac-topbar { padding: var(--space-2) var(--space-3); }
}