/* ============================================================
 *  Part Finder — public-facing styles.
 *  Uses the existing theme variables but applies a cleaner,
 *  modern catalogue layout (not the FoxPro window chrome).
 * ============================================================ */

:root {
  --pf-accent: #1976d2;
  --pf-accent-dark: #115293;
  --pf-ok: #1b5e20;
  --pf-warn: #c62828;
  --pf-border: #dcdcdc;
  --pf-border-soft: #eaeaea;
  --pf-bg: #f6f7f9;
  --pf-card-bg: #ffffff;
  --pf-text: #222;
  --pf-text-soft: #555;
  --pf-text-muted: #888;
}

[data-theme="midnight"] .pf-body,
[data-theme="apple"][data-theme-preference="system"] .pf-body {
  /* dark-mode friendly tweak — minimal */
  --pf-bg: #121417;
  --pf-card-bg: #1b1e22;
  --pf-text: #eee;
  --pf-text-soft: #bbb;
  --pf-text-muted: #888;
  --pf-border: #2b2f35;
  --pf-border-soft: #262a30;
}

.pf-body {
  background: var(--pf-bg);
  color: var(--pf-text);
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: rgba(25,118,210,0.15);
}
/* Keep the page from accidentally sideways-scrolling on mobile.
   Wide artifacts (diagram canvas, cart table on desktop) have their own
   overflow:auto so they still scroll horizontally internally. */
html, body { overflow-x: hidden; }

/* ---- Top bar ---- */
.pf-topbar {
  background: var(--pf-card-bg);
  border-bottom: 1px solid var(--pf-border);
  position: sticky; top: 0; z-index: 30;
}
.pf-topbar-inner {
  max-width: 1400px; margin: 0 auto;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 20px; padding: 10px 18px;
}
.pf-brand {
  text-decoration: none; color: var(--pf-text);
  display: flex; flex-direction: column; line-height: 1;
}
.pf-brand-mark {
  font-weight: 900;
  font-size: 30px;
  letter-spacing: 1.5px;
  color: #d32f2f;
}
.pf-brand-sub {
  font-size: 14px;
  color: var(--pf-accent);
  letter-spacing: 3px;
  text-transform: uppercase;
  font-weight: 700;
  margin-top: 5px;
}
.pf-search-form {
  display: flex; align-items: center; gap: 0;
  max-width: 560px; width: 100%; justify-self: center;
}
.pf-search-input {
  flex: 1; padding: 10px 14px;
  border: 1px solid var(--pf-border);
  border-right: none;
  border-radius: 6px 0 0 6px;
  font-size: 15px;
  background: #fff;
  color: #222;
  outline: none;
}
.pf-search-input:focus { border-color: var(--pf-accent); }
.pf-search-btn {
  padding: 10px 18px;
  background: var(--pf-accent);
  color: #fff;
  border: 1px solid var(--pf-accent);
  border-radius: 0 6px 6px 0;
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
}
.pf-search-btn:hover { background: var(--pf-accent-dark); }

.pf-topnav { display: flex; align-items: center; gap: 10px; font-size: 14px; }
.pf-topnav-link {
  text-decoration: none;
  color: var(--pf-text);
  padding: 6px 10px;
  border-radius: 5px;
}
.pf-topnav-link:hover { background: var(--pf-border-soft); }
.pf-topnav-link.active { color: var(--pf-accent); font-weight: 600; }
.pf-topnav-link--muted { color: var(--pf-text-soft); font-size: 13px; }

.pf-cart-link { position: relative; padding-right: 12px; }
.pf-cart-badge {
  display: inline-block;
  min-width: 20px; padding: 0 6px;
  height: 20px; line-height: 20px;
  background: var(--pf-accent); color: #fff;
  border-radius: 10px;
  font-size: 11px; font-weight: 700; text-align: center;
  margin-left: 4px;
}
.pf-cart-badge[data-count="0"] { background: #bbb; }

.pf-pill {
  font-size: 11px; padding: 3px 8px; border-radius: 10px;
  background: #e3f2fd; color: #0d47a1; border: 1px solid #bbdefb;
}
.pf-pill-b2b { background: #e8f5e9; color: #1b5e20; border-color: #c8e6c9; }

/* ---- Main ---- */
.pf-main {
  max-width: 1400px; margin: 0 auto;
  padding: 20px 18px 60px;
}

.pf-page-header {
  display: flex; align-items: center; justify-content: space-between;
  gap: 14px; margin-bottom: 18px; flex-wrap: wrap;
}
.pf-page-title { font-size: 22px; margin: 0; font-weight: 700; }
.pf-page-subtitle { color: var(--pf-text-soft); font-size: 13px; margin-top: 4px; }
.pf-breadcrumb {
  font-size: 13px; color: var(--pf-text-soft); margin-bottom: 8px;
}
.pf-breadcrumb a { color: var(--pf-text-soft); text-decoration: none; }
.pf-breadcrumb a:hover { color: var(--pf-accent); text-decoration: underline; }
.pf-breadcrumb .sep { margin: 0 6px; color: #bbb; }

/* ---- Card grids ---- */
.pf-card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 16px;
}
.pf-card {
  background: var(--pf-card-bg);
  border: 1px solid var(--pf-border);
  border-radius: 8px;
  overflow: hidden;
  transition: transform 0.08s, box-shadow 0.08s, border-color 0.08s;
  text-decoration: none;
  color: var(--pf-text);
  display: flex; flex-direction: column;
}
.pf-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.08);
  border-color: var(--pf-accent);
}
.pf-card-thumb {
  background: #f4f5f7;
  aspect-ratio: 4 / 3;
  display: flex; align-items: center; justify-content: center;
  border-bottom: 1px solid var(--pf-border-soft);
  overflow: hidden;
}
.pf-card-thumb img {
  max-width: 100%; max-height: 100%; object-fit: contain;
}
.pf-card-body { padding: 12px 14px; }
.pf-card-title { font-weight: 700; font-size: 14px; margin-bottom: 4px; }
.pf-card-meta { font-size: 12px; color: var(--pf-text-soft); }

.pf-empty {
  background: var(--pf-card-bg);
  border: 1px dashed var(--pf-border);
  border-radius: 8px;
  padding: 40px 20px;
  text-align: center;
  color: var(--pf-text-soft);
}

/* ---- Diagram viewer ---- */
.pf-diagram-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 18px;
  align-items: flex-start;
}
@media (max-width: 920px) {
  .pf-diagram-shell { grid-template-columns: 1fr; }
}

.pf-diagram-canvas-wrap {
  background: #1e1e1e;
  border: 1px solid var(--pf-border);
  border-radius: 8px;
  overflow: auto;
  max-height: calc(100vh - 180px);
  position: relative;
}
.pf-diagram-canvas {
  position: relative;
  display: inline-block;
  transform-origin: top left;
  user-select: none;
}
.pf-diagram-canvas img {
  display: block; max-width: none;
  pointer-events: none;
}
.pf-hotspot {
  position: absolute;
  border: 2px solid rgba(13, 71, 161, 1);
  background: rgba(13, 71, 161, 0.22);
  cursor: pointer;
  transition: background 0.12s, border-color 0.12s, box-shadow 0.12s;
  box-sizing: border-box;
}
.pf-hotspot:hover {
  background: rgba(13, 71, 161, 0.45);
  border-color: rgba(10, 55, 130, 1);
  box-shadow: 0 0 0 3px rgba(13, 71, 161, 0.55);
}
.pf-hotspot.selected {
  background: rgba(230, 81, 0, 0.45);
  border-color: #bf360c;
  box-shadow: 0 0 0 3px rgba(191, 54, 12, 0.6);
}
.pf-hotspot[data-stock="out_of_stock"] { border-style: dashed; opacity: 0.7; }

/* Pulse hint on load */
@keyframes pf-pulse {
  0%   { box-shadow: 0 0 0 0 rgba(13, 71, 161, 0.7); }
  70%  { box-shadow: 0 0 0 10px rgba(13, 71, 161, 0); }
  100% { box-shadow: 0 0 0 0 rgba(13, 71, 161, 0); }
}
.pf-hotspot.pulse { animation: pf-pulse 1.4s ease-out 1; }

/* Toolbar over the canvas */
.pf-diagram-toolbar {
  display: flex; gap: 10px; align-items: center;
  background: var(--pf-card-bg);
  border: 1px solid var(--pf-border);
  border-radius: 8px;
  padding: 8px 12px;
  margin-bottom: 10px;
  font-size: 13px;
}
.pf-diagram-toolbar button {
  border: 1px solid var(--pf-border);
  background: #fff;
  padding: 4px 10px;
  border-radius: 5px;
  cursor: pointer;
  font-size: 13px;
}
.pf-diagram-toolbar button:hover { border-color: var(--pf-accent); color: var(--pf-accent); }
.pf-diagram-toolbar .sep { color: #bbb; }

/* Side panel */
.pf-side-panel {
  background: var(--pf-card-bg);
  border: 1px solid var(--pf-border);
  border-radius: 8px;
  padding: 16px;
  position: sticky; top: 76px;
  min-height: 200px;
}
.pf-side-empty {
  color: var(--pf-text-soft);
  font-size: 13px; text-align: center; padding: 30px 10px;
}
.pf-side-code {
  font-size: 20px; font-weight: 700; letter-spacing: 0.5px;
  margin-bottom: 4px;
}
.pf-side-desc {
  color: var(--pf-text-soft); font-size: 13px; margin-bottom: 12px;
  min-height: 36px;
}
.pf-side-price-row {
  display: flex; align-items: baseline; justify-content: space-between;
  padding: 10px 0; border-top: 1px solid var(--pf-border-soft); border-bottom: 1px solid var(--pf-border-soft);
}
.pf-side-price { font-size: 22px; font-weight: 700; }
.pf-side-price-label { font-size: 11px; color: var(--pf-text-muted); text-transform: uppercase; letter-spacing: 1px; }
.pf-side-stock {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 12px; font-weight: 600;
}
.pf-side-stock.in_stock { color: var(--pf-ok); }
.pf-side-stock.out_of_stock { color: var(--pf-warn); }
.pf-side-stock::before {
  content: ""; width: 8px; height: 8px; border-radius: 50%; display: inline-block;
  background: currentColor;
}

.pf-qty-row {
  display: flex; align-items: center; gap: 10px; margin: 14px 0;
}
.pf-qty-wrap {
  display: flex; align-items: stretch;
  border: 1px solid var(--pf-border); border-radius: 5px; overflow: hidden;
}
.pf-qty-btn {
  background: #f0f0f0; border: none; width: 32px; cursor: pointer; font-size: 16px;
}
.pf-qty-btn:hover { background: #e2e2e2; }
.pf-qty-input {
  width: 56px; text-align: center;
  border: none; border-left: 1px solid var(--pf-border); border-right: 1px solid var(--pf-border);
  padding: 6px 4px; font-size: 15px;
}
.pf-qty-input:focus { outline: none; background: #fffde7; }

.pf-add-btn {
  flex: 1;
  padding: 10px 14px; border-radius: 6px;
  background: var(--pf-accent); color: #fff; border: 1px solid var(--pf-accent);
  font-size: 14px; font-weight: 700; cursor: pointer;
}
.pf-add-btn:hover:not([disabled]) { background: var(--pf-accent-dark); }
.pf-add-btn[disabled] { background: #bbb; border-color: #bbb; cursor: not-allowed; }

.pf-side-feedback {
  min-height: 18px; font-size: 12px; color: var(--pf-ok); margin-top: 6px;
}
.pf-side-feedback.err { color: var(--pf-warn); }

/* ---- Search results ---- */
.pf-search-summary {
  color: var(--pf-text-soft); font-size: 13px; margin-bottom: 14px;
}
.pf-product-list {
  display: grid; gap: 10px;
}
.pf-product-row {
  display: grid;
  grid-template-columns: 96px 120px 1fr auto auto;
  align-items: stretch; gap: 14px;
  background: var(--pf-card-bg);
  border: 1px solid var(--pf-border);
  border-radius: 8px;
  padding: 12px 14px;
}
.pf-product-row > :not(.pf-product-thumb-wrap) {
  align-self: center;
}
@media (max-width: 640px) {
  .pf-product-row { grid-template-columns: 1fr; }
  .pf-product-thumb-wrap {
    width: 100%;
    max-width: 140px;
    min-height: 88px;
  }
}
.pf-product-code {
  font-family: "SF Mono", Menlo, Consolas, monospace;
  font-weight: 700; font-size: 14px;
}
.pf-product-thumb-wrap {
  width: 96px;
  min-height: 96px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  border: 1px solid var(--pf-border-soft);
  background: #fff;
  overflow: hidden;
  align-self: stretch;
}
.pf-product-thumb-wrap--empty {
  background: var(--pf-border-soft);
}
.pf-product-thumb {
  width: 100%;
  height: 100%;
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  border: none;
  border-radius: 0;
  background: transparent;
}
.pf-product-desc { color: var(--pf-text-soft); font-size: 13px; }
.pf-product-price { font-weight: 700; font-size: 16px; }
.pf-product-diagrams {
  font-size: 11px; color: var(--pf-text-muted); margin-top: 4px;
}
.pf-product-diagrams a {
  color: var(--pf-accent); text-decoration: none; margin-right: 6px;
}
.pf-product-diagrams a:hover { text-decoration: underline; }

/* ---- Cart ---- */
.pf-cart-table {
  width: 100%; border-collapse: collapse;
  background: var(--pf-card-bg); border: 1px solid var(--pf-border); border-radius: 8px; overflow: hidden;
}
.pf-cart-table th, .pf-cart-table td {
  padding: 12px 14px; border-bottom: 1px solid var(--pf-border-soft);
  text-align: left; font-size: 14px;
}
.pf-cart-table th { background: var(--pf-border-soft); font-size: 12px; text-transform: uppercase; letter-spacing: 0.5px; color: var(--pf-text-soft); }
.pf-cart-table tr:last-child td { border-bottom: none; }
.pf-cart-qty-wrap { display: inline-flex; border: 1px solid var(--pf-border); border-radius: 5px; overflow: hidden; }
.pf-cart-qty-wrap .pf-qty-input { width: 44px; }
.pf-cart-remove-btn {
  background: transparent; border: none; cursor: pointer; color: var(--pf-warn); font-size: 13px;
}
.pf-cart-remove-btn:hover { text-decoration: underline; }

.pf-cart-summary {
  margin-top: 16px; display: flex; justify-content: flex-end;
}
.pf-cart-summary-card {
  background: var(--pf-card-bg);
  border: 1px solid var(--pf-border);
  border-radius: 8px;
  padding: 18px 22px;
  min-width: 280px;
}
.pf-cart-summary-row { display: flex; justify-content: space-between; margin-bottom: 8px; font-size: 14px; }
.pf-cart-summary-row.total { font-size: 18px; font-weight: 700; border-top: 1px solid var(--pf-border); padding-top: 10px; margin-top: 10px; }
.pf-cart-checkout-btn {
  width: 100%; padding: 12px 14px;
  background: var(--pf-accent); color: #fff; border: none; border-radius: 6px;
  font-size: 15px; font-weight: 700; cursor: pointer; margin-top: 12px;
}
.pf-cart-checkout-btn:hover { background: var(--pf-accent-dark); }
.pf-cart-checkout-btn[disabled] { background: #bbb; cursor: not-allowed; }

/* ---- Footer ---- */
.pf-footer {
  margin-top: 40px;
  border-top: 1px solid var(--pf-border);
  background: var(--pf-card-bg);
  font-size: 12px; color: var(--pf-text-soft);
}
.pf-footer-inner {
  max-width: 1400px; margin: 0 auto;
  padding: 14px 18px;
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px;
}
.pf-footer a { color: var(--pf-text-soft); text-decoration: none; }
.pf-footer a:hover { color: var(--pf-accent); }
.pf-sep { margin: 0 6px; color: #bbb; }

/* ---- Search popup ---- */
.pf-search-modal {
  position: fixed; inset: 0;
  z-index: 70;
  display: flex; align-items: flex-start; justify-content: center;
  padding: 48px 20px 20px;
}
.pf-search-modal[hidden] { display: none; }
.pf-search-modal-backdrop {
  position: absolute; inset: 0;
  background: rgba(15, 20, 30, 0.55);
  backdrop-filter: saturate(120%) blur(2px);
  -webkit-backdrop-filter: saturate(120%) blur(2px);
}
.pf-search-modal-card {
  position: relative;
  width: 100%;
  max-width: 720px;
  max-height: calc(100vh - 80px);
  background: var(--pf-card-bg);
  border: 1px solid var(--pf-border);
  border-radius: 10px;
  box-shadow: 0 18px 48px rgba(0,0,0,0.28);
  display: flex; flex-direction: column;
  overflow: hidden;
  animation: pf-modal-in 0.12s ease-out;
}
@keyframes pf-modal-in {
  from { opacity: 0; transform: translateY(-6px); }
  to   { opacity: 1; transform: translateY(0); }
}
.pf-search-modal-head {
  display: flex; align-items: flex-start; justify-content: space-between;
  gap: 12px; padding: 14px 18px;
  border-bottom: 1px solid var(--pf-border-soft);
  background: var(--pf-card-bg);
}
.pf-search-modal-title { font-weight: 700; font-size: 15px; }
.pf-search-modal-sub { font-size: 12px; color: var(--pf-text-soft); margin-top: 2px; }
.pf-search-modal-close {
  background: transparent; border: none; cursor: pointer;
  font-size: 28px; line-height: 1; color: var(--pf-text-muted);
  padding: 0 4px;
}
.pf-search-modal-close:hover { color: var(--pf-accent); }
.pf-search-modal-body {
  overflow-y: auto;
  flex: 1 1 auto;
  padding: 6px 0;
}
.pf-search-modal-loading,
.pf-search-modal-empty {
  padding: 28px 20px;
  color: var(--pf-text-soft);
  font-size: 13px;
  text-align: center;
}
.pf-search-modal-foot {
  padding: 10px 18px;
  border-top: 1px solid var(--pf-border-soft);
  background: var(--pf-bg);
  font-size: 12px;
  display: flex; justify-content: flex-end;
}
.pf-search-modal-all {
  color: var(--pf-accent);
  text-decoration: none;
  font-weight: 600;
}
.pf-search-modal-all:hover { text-decoration: underline; }

.pf-result-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 6px 14px;
  padding: 12px 18px;
  border-bottom: 1px solid var(--pf-border-soft);
  align-items: center;
}
.pf-result-main {
  display: flex;
  align-items: stretch;
  gap: 12px;
  min-width: 0;
}
.pf-result-text { min-width: 0; align-self: center; }
.pf-result-thumb-wrap {
  flex: 0 0 80px;
  width: 80px;
  min-height: 80px;
  align-self: stretch;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  border: 1px solid var(--pf-border-soft);
  background: #fff;
  overflow: hidden;
}
.pf-result-thumb-wrap--empty {
  background: var(--pf-border-soft);
}
.pf-result-thumb {
  width: 100%;
  height: 100%;
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  flex-shrink: 0;
  border: none;
  border-radius: 0;
  background: transparent;
}
.pf-result-row:last-child { border-bottom: none; }
.pf-result-row:hover { background: var(--pf-bg); }
.pf-result-code { font-weight: 700; font-family: "SF Mono", Menlo, Consolas, monospace; font-size: 14px; }
.pf-result-desc { font-size: 13px; color: var(--pf-text-soft); }
.pf-result-links { grid-column: 1 / -1; font-size: 11px; color: var(--pf-text-muted); }
.pf-result-links a {
  color: var(--pf-accent);
  text-decoration: none;
  margin-right: 8px;
}
.pf-result-links a:hover { text-decoration: underline; }
.pf-result-right { text-align: right; display: flex; flex-direction: column; align-items: flex-end; gap: 6px; }
.pf-result-price { font-weight: 700; font-size: 15px; }
.pf-result-stock { font-size: 11px; font-weight: 600; }
.pf-result-stock.in_stock { color: var(--pf-ok); }
.pf-result-stock.out_of_stock { color: var(--pf-warn); }
.pf-result-add {
  padding: 6px 12px;
  background: var(--pf-accent);
  color: #fff;
  border: 1px solid var(--pf-accent);
  border-radius: 5px;
  font-size: 12px;
  font-weight: 700;
  cursor: pointer;
}
.pf-result-add:hover:not([disabled]) { background: var(--pf-accent-dark); }
.pf-result-add[disabled] { background: #bbb; border-color: #bbb; cursor: not-allowed; }

/* Mobile: simpler stacked result card */
@media (max-width: 560px) {
  .pf-search-modal { padding: 14px 10px 10px; }
  .pf-search-modal-card { max-height: calc(100vh - 30px); border-radius: 8px; }
  .pf-search-modal-head { padding: 12px 14px; }
  .pf-result-row {
    grid-template-columns: 1fr;
    padding: 12px 14px;
  }
  .pf-result-right {
    flex-direction: row; align-items: center; justify-content: space-between;
    width: 100%;
  }
}

/* ---- Toast ---- */
.pf-toast {
  position: fixed; bottom: 30px; left: 50%; transform: translateX(-50%) translateY(40px);
  background: #323232; color: #fff; padding: 10px 18px; border-radius: 6px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.25);
  opacity: 0; transition: opacity 0.2s, transform 0.2s;
  z-index: 60; font-size: 14px;
}
.pf-toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.pf-toast.err { background: #b71c1c; }

/* ---- Book search (home) ---- */
.pf-book-search {
  display: flex;
  gap: 8px;
  align-items: center;
  margin: 0 0 14px 0;
  flex-wrap: wrap;
}
.pf-book-search-input {
  flex: 1 1 320px;
  min-width: 0;
  padding: 10px 14px;
  font-size: 14px;
  border: 1px solid var(--pf-border);
  border-radius: 6px;
  background: var(--pf-card-bg);
  color: var(--pf-text);
}
.pf-book-search-input:focus {
  outline: none;
  border-color: var(--pf-accent);
  box-shadow: 0 0 0 3px rgba(25,118,210,0.15);
}
.pf-book-search-btn {
  padding: 10px 18px;
  background: var(--pf-accent);
  color: #fff;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
}
.pf-book-search-btn:hover { background: var(--pf-accent-dark); }
.pf-book-search-clear {
  color: var(--pf-text-muted);
  text-decoration: none;
  font-size: 13px;
  padding: 10px 8px;
}
.pf-book-search-clear:hover { color: var(--pf-accent); }
.pf-book-search-note {
  font-size: 13px;
  color: var(--pf-text-soft);
  margin-bottom: 12px;
}

/* =======================================================
 *  Responsive / mobile
 *  Tiers:
 *    <= 960px  tablet
 *    <= 720px  small tablet / large phone
 *    <= 560px  phone
 *    <= 400px  small phone
 * ======================================================= */

/* Tablet */
@media (max-width: 960px) {
  .pf-main { padding: 16px 14px 70px; }
  .pf-page-title { font-size: 20px; }
  .pf-card-grid { grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 14px; }
  .pf-diagram-canvas-wrap { max-height: 70vh; }
  .pf-side-panel { position: static; top: auto; }
}

/* Large phones / small tablets */
@media (max-width: 720px) {
  /* Topbar: brand + nav share one row, search drops to its own row. */
  .pf-topbar-inner {
    grid-template-columns: auto 1fr;
    gap: 8px 10px;
    padding: 8px 12px;
    grid-template-areas:
      "brand nav"
      "search search";
  }
  .pf-brand { grid-area: brand; }
  .pf-topnav { grid-area: nav; justify-self: end; font-size: 13px; gap: 4px; flex-wrap: nowrap; }
  .pf-search-form { grid-area: search; max-width: none; }
  .pf-brand-mark { font-size: 22px; letter-spacing: 1px; }
  .pf-brand-sub { font-size: 11px; letter-spacing: 2px; margin-top: 2px; }
  .pf-topnav-link { padding: 6px 8px; }
  .pf-topnav-link--muted { font-size: 12px; }
  .pf-pill { display: none; } /* Save space; B2B indicator still in footer */

  .pf-main { padding: 14px 12px 80px; }
  .pf-page-header { flex-direction: column; align-items: flex-start; gap: 6px; }
  .pf-page-title { font-size: 18px; }
  .pf-page-subtitle { font-size: 12px; }
  .pf-breadcrumb { font-size: 12px; }

  /* Cards */
  .pf-card-grid { grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 10px; }
  .pf-card-body { padding: 10px 12px; }
  .pf-card-title { font-size: 13px; }
  .pf-card-meta { font-size: 11px; }
  .pf-card:hover { transform: none; } /* No hover lift on touch */

  /* Book search */
  .pf-book-search { gap: 6px; }
  .pf-book-search-input { flex: 1 1 100%; padding: 10px 12px; font-size: 14px; }
  .pf-book-search-btn { padding: 10px 14px; font-size: 13px; }

  /* Diagram viewer toolbar */
  .pf-diagram-toolbar {
    flex-wrap: wrap;
    gap: 6px;
    padding: 6px 8px;
    font-size: 12px;
  }
  .pf-diagram-toolbar button,
  .pf-diagram-toolbar .pf-topnav-link {
    min-height: 38px;
    padding: 6px 12px;
    font-size: 13px;
  }
  #pf-zoom-in, #pf-zoom-out { min-width: 40px; font-size: 18px; font-weight: 700; }
  .pf-diagram-toolbar label { min-height: 38px; display: inline-flex; align-items: center; }
  .pf-diagram-toolbar .sep { display: none; } /* vertical dividers look cluttered wrapped */

  .pf-diagram-canvas-wrap { max-height: 60vh; border-radius: 6px; }

  /* Side panel: not sticky, full-width under the diagram */
  .pf-side-panel {
    position: static;
    padding: 14px;
  }
  .pf-side-code { font-size: 18px; }
  .pf-side-price { font-size: 20px; }

  /* Bigger qty buttons for thumbs */
  .pf-qty-btn { width: 40px; height: 40px; font-size: 18px; }
  .pf-qty-input { width: 56px; height: 40px; font-size: 16px; }
  .pf-add-btn { padding: 12px 14px; font-size: 15px; min-height: 44px; }

  /* Search results: stack nicely; hide heavy grid */
  .pf-product-row {
    grid-template-columns: 1fr;
    gap: 8px;
    padding: 12px;
  }
  .pf-product-row > div:nth-child(3) { /* price block */
    text-align: left;
    display: flex; align-items: center; justify-content: space-between;
  }
  .pf-product-row .pf-add-btn { width: 100%; padding: 10px 12px !important; min-height: 42px; }

  /* Cart: convert table to card rows with labels (cart.php sets data-label). */
  .pf-cart-table { border: none; background: transparent; }
  .pf-cart-table thead { display: none; }
  .pf-cart-table, .pf-cart-table tbody { display: block; width: 100%; }
  .pf-cart-table tr {
    display: block;
    background: var(--pf-card-bg);
    border: 1px solid var(--pf-border);
    border-radius: 8px;
    margin-bottom: 10px;
    padding: 12px 14px 8px;
    position: relative;
  }
  .pf-cart-table td {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    padding: 6px 0;
    border: none;
    text-align: left;
    font-size: 14px;
  }
  .pf-cart-table td::before {
    content: attr(data-label);
    font-size: 11px;
    color: var(--pf-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 600;
    flex: 0 0 auto;
  }
  /* Part code cell = the row title */
  .pf-cart-table td.pf-cart-cell-code {
    justify-content: flex-start;
    font-size: 16px;
    padding-right: 40px; /* room for the ✕ */
    border-bottom: 1px solid var(--pf-border-soft);
    margin-bottom: 4px;
    padding-bottom: 8px;
  }
  .pf-cart-table td.pf-cart-cell-code::before { display: none; }
  /* Remove button floats top-right */
  .pf-cart-table td.pf-cart-cell-remove {
    position: absolute;
    top: 6px; right: 6px;
    padding: 0;
  }
  .pf-cart-table td.pf-cart-cell-remove::before { display: none; }
  .pf-cart-remove-btn { font-size: 20px; padding: 8px 12px; }

  .pf-cart-summary { justify-content: stretch; }
  .pf-cart-summary-card { min-width: 0; width: 100%; }
  .pf-cart-checkout-btn { padding: 14px; font-size: 16px; min-height: 48px; }

  .pf-footer-inner { flex-direction: column; align-items: center; text-align: center; gap: 6px; }
}

/* Phones */
@media (max-width: 560px) {
  .pf-card-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
  .pf-brand-sub { font-size: 10px; letter-spacing: 1.5px; }
  .pf-topnav-link--muted { display: none; } /* B2B sign-in link available in footer */
  .pf-diagram-canvas-wrap { max-height: 55vh; }
  .pf-side-price-row { flex-wrap: wrap; gap: 6px; }
}

/* Small phones */
@media (max-width: 400px) {
  .pf-topbar-inner { padding: 6px 10px; }
  .pf-brand-mark { font-size: 20px; }
  .pf-search-input { font-size: 14px; padding: 9px 10px; }
  .pf-search-btn { padding: 9px 12px; }
  .pf-main { padding: 12px 10px 90px; }
  .pf-card-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; }
  .pf-card-title { font-size: 12px; }
  .pf-card-meta { font-size: 10px; }
  .pf-cart-summary-card { padding: 14px 16px; }
}

/* Give hotspots a slightly easier tap target on coarse pointers (touch). */
@media (hover: none) and (pointer: coarse) {
  .pf-hotspot { border-width: 3px; }
  /* Disable the hover-lift transform on cards (prevents flicker on tap) */
  .pf-card:hover { transform: none; box-shadow: none; border-color: var(--pf-border); }
}