/* Site chrome: header, search combobox, mobile menu, footer. OWNER: chrome agent. */

.site-header {
  position: sticky; top: 0; z-index: 50;
  background: var(--surface);
  border-bottom: 1px solid var(--line);
}
.chrome-bar {
  position: relative;
  height: var(--header-h);
  display: flex; align-items: center; gap: 28px;
}

/* Logo */
.chrome-logo { display: inline-flex; align-items: center; gap: 10px; flex: none; color: var(--text); border-radius: var(--r-sm); }
.chrome-logo:hover { color: var(--text); }
.chrome-logo img { width: 28px; height: 28px; }
.chrome-wordmark { font-family: var(--font-display); font-weight: 700; font-size: var(--step-1); letter-spacing: -0.02em; }
.chrome-logo-sm img { width: 22px; height: 22px; }

/* Nav */
.chrome-nav ul { display: flex; gap: 4px; list-style: none; margin: 0; padding: 0; }
.chrome-nav-link {
  display: inline-flex; align-items: center; min-height: 40px; padding: 0 12px;
  border-radius: var(--r-sm); color: var(--text-2); font-weight: 600;
  transition: color 0.2s, background 0.2s var(--ease-out);
}
.chrome-nav-link:hover { color: var(--text); background: var(--raised); }
.chrome-nav-link[aria-current="page"] { color: var(--accent); background: var(--accent-soft); }

/* Search */
.chrome-search { margin-left: auto; width: min(360px, 40vw); }
.chrome-search-form { position: relative; }
.chrome-search-icon { position: absolute; left: 12px; top: 50%; transform: translateY(-50%); color: var(--text-3); pointer-events: none; }
#chrome-search-input {
  width: 100%; height: 40px; padding: 0 12px 0 38px;
  background: var(--bg); border: 1px solid var(--line); border-radius: var(--r-sm);
  color: var(--text); outline: none;
  transition: border-color 0.2s var(--ease-out);
}
#chrome-search-input::placeholder { color: var(--text-3); }
#chrome-search-input:hover { border-color: var(--text-3); }
#chrome-search-input:focus-visible { border-color: var(--accent); outline: 2px solid var(--accent); outline-offset: 1px; }
#chrome-search-input::-webkit-search-cancel-button { filter: grayscale(1); }

.chrome-suggest {
  position: absolute; top: calc(100% + 6px); left: 0; right: 0; z-index: 60;
  list-style: none; margin: 0; padding: 6px;
  background: var(--raised); border-radius: var(--r-md); box-shadow: var(--shadow);
  max-height: min(70vh, 460px); overflow-y: auto; overscroll-behavior: contain;
}
.chrome-suggest[hidden] { display: none; }
.chrome-option {
  display: flex; align-items: center; gap: 12px; padding: 6px 8px;
  border-radius: var(--r-sm); cursor: pointer;
}
.chrome-option[aria-selected="true"] { background: color-mix(in srgb, var(--accent) 12%, var(--raised)); }
.chrome-option[aria-selected="true"] .chrome-option-title { color: var(--accent); }
.chrome-option-cover { width: 36px; height: 48px; flex: none; object-fit: cover; border-radius: 4px; background: var(--surface); }
.chrome-option-text { display: flex; flex-direction: column; min-width: 0; gap: 2px; }
.chrome-option-title { font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.chrome-option-meta { display: flex; align-items: center; gap: 4px; color: var(--text-3); font-size: var(--step--1); }
.chrome-suggest-msg { padding: 14px 10px; color: var(--text-2); font-size: var(--step--1); }
.chrome-suggest-msg.is-error { color: var(--danger); }
.chrome-suggest-all { border-top: 1px solid var(--line); margin-top: 6px; padding-top: 6px; }
.chrome-suggest-all a { display: block; padding: 8px; border-radius: var(--r-sm); color: var(--text-2); font-size: var(--step--1); font-weight: 600; }
.chrome-suggest-all a:hover { color: var(--accent); background: var(--surface); }

/* Mobile action buttons (hidden on desktop) */
.chrome-mobile-actions { display: none; margin-left: auto; gap: 4px; }
.chrome-icon-btn {
  display: inline-grid; place-items: center; width: 44px; height: 44px;
  border: 0; border-radius: var(--r-sm); background: transparent; color: var(--text-2);
  transition: background 0.2s var(--ease-out), color 0.2s;
}
.chrome-icon-btn:hover, .chrome-icon-btn[aria-expanded="true"] { background: var(--raised); color: var(--text); }

@media (max-width: 759.98px) {
  .chrome-bar { gap: 12px; }
  .chrome-mobile-actions { display: flex; }

  .chrome-nav {
    display: none;
    position: absolute; top: 100%; left: calc(-1 * var(--gutter)); right: calc(-1 * var(--gutter));
    background: var(--surface); border-bottom: 1px solid var(--line);
    padding: 8px var(--gutter) 14px;
  }
  .site-header.is-menu-open .chrome-nav { display: block; animation: chrome-drop 0.22s var(--ease-out); }
  .chrome-nav ul { flex-direction: column; gap: 2px; }
  .chrome-nav-link { display: flex; min-height: 46px; font-size: var(--step-1); }

  .chrome-search {
    display: none;
    position: absolute; top: 100%; left: calc(-1 * var(--gutter)); right: calc(-1 * var(--gutter));
    width: auto; margin: 0;
    background: var(--surface); border-bottom: 1px solid var(--line);
    padding: 10px var(--gutter);
  }
  .site-header.is-search-open .chrome-search { display: block; animation: chrome-drop 0.22s var(--ease-out); }
  #chrome-search-input { height: 44px; font-size: 16px; }
}
@keyframes chrome-drop { from { opacity: 0; transform: translateY(-6px); } }

/* Footer */
.site-footer { margin-top: 64px; border-top: 1px solid var(--line); background: var(--surface); }
.chrome-footer {
  display: grid; grid-template-columns: auto 1fr auto; align-items: center;
  gap: 12px 28px; padding-block: 28px;
  color: var(--text-2); font-size: var(--step--1);
}
.chrome-footer-links { display: flex; flex-wrap: wrap; gap: 4px 18px; }
.chrome-footer-links a { color: var(--text-2); font-weight: 600; padding-block: 6px; }
.chrome-footer-links a:hover { color: var(--accent); }
.chrome-footer-copy { grid-column: 1 / -1; color: var(--text-3); }

@media (max-width: 759.98px) {
  .chrome-footer { grid-template-columns: 1fr; }
}