:root {
  --accent: #009999;
  --accent-dark: #007a7a;
  --text: #1a1a1a;
  --muted: #6b7280;
  --line: #e2e5e9;
  --bg: #f6f7f8;
  --radius: 8px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Segoe UI", system-ui, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.5;
}

.muted { color: var(--muted); }

/* ---------- Topbar ---------- */

.topbar {
  background: #fff;
  border-bottom: 3px solid var(--accent);
}

.topbar-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 1.1rem 1.5rem;
  display: flex;
  align-items: baseline;
  gap: 1.25rem;
  flex-wrap: wrap;
}

.brand {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--accent);
  text-decoration: none;
  letter-spacing: -.02em;
}

.brand span { color: var(--text); font-weight: 400; }

.tagline { margin: 0; color: var(--muted); font-size: .9rem; }

/* ---------- Layout ---------- */

.layout {
  max-width: 1280px;
  margin: 0 auto;
  padding: 1.5rem;
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 1.5rem;
  align-items: start;
}

/* ---------- Sidebar ---------- */

.sidebar {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1rem;
  position: sticky;
  top: 1.5rem;
}

.sidebar-title {
  margin: 0 0 .75rem;
  font-size: .8rem;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--muted);
}

.reset-btn {
  width: 100%;
  margin-bottom: .75rem;
  padding: .5rem .6rem;
  font: inherit;
  font-size: .9rem;
  text-align: left;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 6px;
  cursor: pointer;
}

.reset-btn:hover { border-color: var(--accent); color: var(--accent); }

.tree ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.tree > ul > li + li { margin-top: .15rem; }

.tree .subtree {
  margin-left: .55rem;
  padding-left: .55rem;
  border-left: 1px solid var(--line);
}

.tree .subtree[hidden] { display: none; }

/* Nut nhom (cap 1) — chi dong/mo, khong loc */
.node-group {
  display: flex;
  align-items: center;
  gap: .4rem;
  width: 100%;
  padding: .45rem .5rem;
  font: inherit;
  font-weight: 600;
  font-size: .92rem;
  text-align: left;
  color: var(--text);
  background: none;
  border: 0;
  border-radius: 6px;
  cursor: pointer;
}

.node-group:hover { background: var(--bg); }

.caret {
  flex: none;
  width: .7rem;
  color: var(--muted);
  transition: transform .15s ease;
}

.node-group[aria-expanded="true"] .caret { transform: rotate(90deg); }

/* Nut danh muc la — bam de loc */
.node-leaf {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: .5rem;
  width: 100%;
  padding: .38rem .5rem;
  font: inherit;
  font-size: .88rem;
  text-align: left;
  color: var(--text);
  background: none;
  border: 0;
  border-radius: 6px;
  cursor: pointer;
}

.node-leaf:hover { background: var(--bg); color: var(--accent-dark); }

.node-leaf.active {
  background: var(--accent);
  color: #fff;
  font-weight: 600;
}

.node-leaf .badge {
  flex: none;
  font-size: .75rem;
  color: var(--muted);
  background: var(--bg);
  border-radius: 999px;
  padding: 0 .4rem;
}

.node-leaf.active .badge { color: #fff; background: rgba(255, 255, 255, .25); }

/* ---------- Content ---------- */

.content-head {
  display: flex;
  align-items: baseline;
  gap: .6rem;
  margin-bottom: 1rem;
}

.content-head h2 { margin: 0; font-size: 1.3rem; }

.count { color: var(--muted); font-size: .9rem; }

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(215px, 1fr));
  gap: 1rem;
}

.card {
  display: flex;
  flex-direction: column;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color .15s ease, box-shadow .15s ease;
}

.card-link {
  display: flex;
  flex-direction: column;
  flex: 1;
  color: inherit;
  text-decoration: none;
}

.card:hover {
  border-color: var(--accent);
  box-shadow: 0 2px 10px rgba(0, 0, 0, .06);
}

.card-img {
  display: block;
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  background: var(--bg);
  border-bottom: 1px solid var(--line);
}

.card-body {
  display: flex;
  flex-direction: column;
  gap: .35rem;
  padding: .8rem;
  flex: 1;
}

.card-name {
  margin: 0;
  font-size: .95rem;
  font-weight: 600;
  line-height: 1.35;
}

.card-sku {
  font-family: Consolas, "Courier New", monospace;
  font-size: .78rem;
  color: var(--muted);
}

.card-price {
  margin-top: auto;
  padding-top: .35rem;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--accent-dark);
}

.card-stock { font-size: .78rem; color: var(--muted); }

.card-stock.out { color: #b91c1c; }

.empty, .error {
  grid-column: 1 / -1;
  padding: 2rem 1rem;
  text-align: center;
  background: #fff;
  border: 1px dashed var(--line);
  border-radius: var(--radius);
  color: var(--muted);
}

.error { color: #b91c1c; border-color: #f3c2c2; }

/* ---------- Gio hang ---------- */

.admin-link {
  margin-left: auto;
  padding: .4rem .8rem;
  font-size: .9rem;
  font-weight: 600;
  color: var(--muted);
  text-decoration: none;
  border: 1px solid var(--line);
  border-radius: 999px;
}

.admin-link:hover { color: var(--accent-dark); border-color: var(--accent); }

/* Khi co ca hai nut thi chi nut dau tien day sang phai */
.admin-link + .cart-link { margin-left: 0; }

.cart-link {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  padding: .4rem .8rem;
  font-size: .9rem;
  font-weight: 600;
  color: var(--accent-dark);
  text-decoration: none;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 999px;
}

.cart-link:hover { border-color: var(--accent); }

.cart-count {
  min-width: 1.4rem;
  padding: 0 .35rem;
  font-size: .78rem;
  text-align: center;
  color: #fff;
  background: var(--accent);
  border-radius: 999px;
}

.add-btn {
  margin: 0 .8rem .8rem;
  padding: .5rem .7rem;
  font: inherit;
  font-size: .88rem;
  font-weight: 600;
  color: #fff;
  background: var(--accent);
  border: 1px solid var(--accent);
  border-radius: 6px;
  cursor: pointer;
  transition: background .15s ease;
}

.add-btn:hover { background: var(--accent-dark); }
.add-btn.added { background: #15803d; border-color: #15803d; }
.add-btn:disabled { opacity: .6; cursor: default; }

.add-btn-lg {
  margin: 0;
  padding: .65rem 1.2rem;
  font-size: .95rem;
}

.detail-actions {
  display: flex;
  align-items: flex-end;
  gap: .75rem;
  margin: 1rem 0 .25rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
}

.qty-label {
  display: flex;
  flex-direction: column;
  gap: .3rem;
  font-size: .82rem;
  color: var(--muted);
}

.qty-input {
  width: 5.5rem;
  padding: .5rem .6rem;
  font: inherit;
  font-size: .9rem;
  border: 1px solid var(--line);
  border-radius: 6px;
}

.qty-input:focus { outline: 2px solid var(--accent); outline-offset: -1px; }

.page-title { margin: 0 0 1.25rem; font-size: 1.5rem; }

.cart-table {
  width: 100%;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  border-collapse: collapse;
  overflow: hidden;
}

.cart-table th,
.cart-table td {
  padding: .7rem .8rem;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: middle;
}

.cart-table thead th {
  font-size: .78rem;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--muted);
  background: var(--bg);
}

.cart-table tbody tr:last-child td { border-bottom: 0; }

.cart-table .num { text-align: right; white-space: nowrap; }
.cart-table .line-total { font-weight: 700; color: var(--accent-dark); }

.cart-img {
  width: 64px;
  height: 48px;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--bg);
}

.cart-name { font-weight: 600; color: inherit; text-decoration: none; }
.cart-name:hover { color: var(--accent-dark); text-decoration: underline; }

.cart-sku {
  font-family: Consolas, "Courier New", monospace;
  font-size: .78rem;
  color: var(--muted);
}

.remove-btn {
  padding: .35rem .6rem;
  font: inherit;
  font-size: .82rem;
  color: #b91c1c;
  background: none;
  border: 1px solid var(--line);
  border-radius: 6px;
  cursor: pointer;
}

.remove-btn:hover { border-color: #b91c1c; background: #fef2f2; }

.contact-form {
  margin-top: 1rem;
  padding: 1.25rem;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.form-title { margin: 0 0 .25rem; font-size: 1.05rem; }
.form-hint { margin: 0 0 1rem; font-size: .85rem; }

.field-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
}

.field { display: flex; flex-direction: column; gap: .3rem; }
.field-wide { grid-column: 1 / -1; }

.field label { font-size: .85rem; font-weight: 600; color: #374151; }

.required-mark { color: #b91c1c; }

.field-input {
  padding: .55rem .7rem;
  font: inherit;
  font-size: .92rem;
  color: var(--text);
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 6px;
  resize: vertical;
}

.field-input:focus { outline: 2px solid var(--accent); outline-offset: -1px; }

.field-input.invalid { border-color: #b91c1c; background: #fef2f2; }
.field-input.invalid:focus { outline-color: #b91c1c; }

.field-error {
  margin: 0;
  font-size: .82rem;
  color: #b91c1c;
}

.confirm-subtitle {
  margin: 1.25rem 0 .5rem;
  font-size: .8rem;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--muted);
}

.order-done .spec-table { margin-top: 0; max-width: 420px; }

.cart-summary {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: .75rem;
  margin-top: 1.25rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
}

.total-label { color: var(--muted); font-size: .9rem; }

.total-value {
  margin-right: .75rem;
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--accent-dark);
}

.order-done {
  padding: 2rem 1.5rem;
  background: #fff;
  border: 1px solid var(--line);
  border-left: 4px solid #15803d;
  border-radius: var(--radius);
}

.order-done h2 { margin: 0 0 .5rem; font-size: 1.25rem; color: #15803d; }
.order-done p { margin: 0 0 .35rem; }

/* ---------- Trang chi tiet ---------- */

.detail-wrap {
  max-width: 1000px;
  margin: 0 auto;
  padding: 1.5rem;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .4rem;
  margin-bottom: 1rem;
  font-size: .88rem;
  color: var(--muted);
}

.breadcrumb a { color: var(--accent-dark); text-decoration: none; }
.breadcrumb a:hover { text-decoration: underline; }
.breadcrumb .sep { color: var(--line); }

.detail {
  display: grid;
  grid-template-columns: minmax(0, 380px) minmax(0, 1fr);
  gap: 1.75rem;
  align-items: start;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.5rem;
}

.detail-img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.detail-info { display: flex; flex-direction: column; gap: .5rem; }

.detail-name { margin: 0; font-size: 1.5rem; line-height: 1.3; }

.detail-sku {
  margin: 0;
  font-family: Consolas, "Courier New", monospace;
  font-size: .85rem;
  color: var(--muted);
}

.detail-price {
  margin: .25rem 0 0;
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--accent-dark);
}

.detail-stock { margin: 0; font-size: .9rem; color: var(--muted); }
.detail-stock.out { color: #b91c1c; }

.detail-desc {
  margin: .5rem 0 0;
  padding-top: .75rem;
  border-top: 1px solid var(--line);
  color: #374151;
}

.spec-table {
  width: 100%;
  margin-top: 1rem;
  border-collapse: collapse;
  font-size: .9rem;
}

.spec-table caption {
  text-align: left;
  padding-bottom: .5rem;
  font-weight: 600;
  font-size: .8rem;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--muted);
}

.spec-table th,
.spec-table td {
  padding: .55rem .7rem;
  border: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.spec-table th {
  width: 40%;
  font-weight: 600;
  background: var(--bg);
  color: #374151;
}

.spec-table tr:hover td { background: #fafbfc; }

.back-link {
  margin-top: 1.25rem;
  align-self: start;
  font-size: .9rem;
  color: var(--accent-dark);
  text-decoration: none;
}

.back-link:hover { text-decoration: underline; }

/* ---------- Trang quan tri ---------- */

.admin-wrap {
  max-width: 1400px;
  margin: 0 auto;
  padding: 1.5rem;
}

.tabs {
  display: flex;
  gap: .4rem;
  margin-bottom: 1.25rem;
  border-bottom: 1px solid var(--line);
}

.tab {
  padding: .6rem 1.1rem;
  font: inherit;
  font-size: .95rem;
  font-weight: 600;
  color: var(--muted);
  background: none;
  border: 0;
  border-bottom: 3px solid transparent;
  margin-bottom: -1px;
  cursor: pointer;
}

.tab:hover { color: var(--accent-dark); }

.tab.active { color: var(--accent-dark); border-bottom-color: var(--accent); }

.result-count { margin: 0 0 .6rem; font-size: .85rem; }

.admin-table {
  width: 100%;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  border-collapse: collapse;
  overflow: hidden;
  font-size: .9rem;
}

.admin-table th,
.admin-table td {
  padding: .6rem .7rem;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.admin-table thead th {
  font-size: .76rem;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--muted);
  background: var(--bg);
  white-space: nowrap;
}

.admin-table tbody tr:last-child td { border-bottom: 0; }
.admin-table tbody tr:hover { background: #fafbfc; }
.admin-table tbody tr.dirty { background: #fffbeb; }

.admin-table .mono {
  font-family: Consolas, "Courier New", monospace;
  font-size: .82rem;
}

.admin-table .nowrap { white-space: nowrap; }
.admin-table .num { text-align: right; white-space: nowrap; }
.admin-table .strong { font-weight: 700; color: var(--accent-dark); }

.customer-name { font-weight: 600; }

.customer-meta {
  font-size: .82rem;
  color: var(--muted);
}

.customer-note {
  margin-top: .25rem;
  font-size: .82rem;
  color: #374151;
  font-style: italic;
}

.order-items {
  margin: 0;
  padding: 0;
  list-style: none;
  min-width: 240px;
}

.order-items li + li { margin-top: .4rem; }

.order-item-name { display: block; font-weight: 600; }

.order-item-meta {
  display: block;
  font-family: Consolas, "Courier New", monospace;
  font-size: .78rem;
  color: var(--muted);
}

.status-cell { display: flex; flex-direction: column; gap: .3rem; }

.status-select {
  padding: .4rem .5rem;
  font: inherit;
  font-size: .85rem;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 6px;
  cursor: pointer;
}

.status-select:focus { outline: 2px solid var(--accent); outline-offset: -1px; }

.inline-input {
  width: 100%;
  min-width: 88px;
  padding: .4rem .5rem;
  font-size: .85rem;
}

.desc-input { min-width: 220px; }

.action-cell { white-space: nowrap; }

.save-btn {
  padding: .45rem .9rem;
  font: inherit;
  font-size: .85rem;
  font-weight: 600;
  color: #fff;
  background: var(--accent);
  border: 1px solid var(--accent);
  border-radius: 6px;
  cursor: pointer;
}

.save-btn:hover { background: var(--accent-dark); }
.save-btn:disabled { opacity: .6; cursor: default; }

.image-cell { min-width: 210px; }

.image-preview {
  display: block;
  width: 72px;
  height: 54px;
  margin-bottom: .35rem;
  object-fit: cover;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 4px;
}

.image-input { font-size: .78rem; }

.sku-input {
  min-width: 150px;
  font-family: Consolas, "Courier New", monospace;
  font-size: .8rem;
}

.action-cell .remove-btn { margin-left: .35rem; }

.cat-add-root {
  margin-left: 0;
  margin-top: 0;
  margin-bottom: .25rem;
  padding: 1rem;
  padding-top: 1rem;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  border-top: 1px solid var(--line);
}

.cat-add-root .cat-name-input { flex: 0 1 320px; }

/* ---------- Tab danh muc ---------- */

.cat-tree { display: flex; flex-direction: column; gap: 1rem; }

.cat-group {
  padding: 1rem;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.cat-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .5rem;
  padding: .45rem 0;
}

.cat-row + .cat-row { border-top: 1px solid var(--line); }

.cat-level-1 { padding-bottom: .7rem; }
.cat-level-1 .cat-name-input { font-weight: 700; }

.cat-level-2 {
  margin-left: 1.25rem;
  padding-left: .75rem;
  border-left: 2px solid var(--line);
}

.cat-name-input {
  width: auto;
  min-width: 200px;
  flex: 0 1 260px;
  padding: .4rem .6rem;
  font-size: .9rem;
}

.cat-slug {
  padding: .15rem .45rem;
  font-family: Consolas, "Courier New", monospace;
  font-size: .76rem;
  color: var(--muted);
  background: var(--bg);
  border-radius: 4px;
}

.cat-count {
  font-size: .8rem;
  color: var(--muted);
  white-space: nowrap;
}

.cat-add {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .5rem;
  margin-left: 1.25rem;
  margin-top: .7rem;
  padding-top: .7rem;
  border-top: 1px dashed var(--line);
}

.siemens-link {
  display: inline-flex;
  align-items: center;
  padding: .65rem 1.1rem;
  font-size: .9rem;
  font-weight: 600;
  color: var(--accent-dark);
  text-decoration: none;
  background: #fff;
  border: 1px solid var(--accent);
  border-radius: 6px;
}

.siemens-link:hover { background: var(--bg); }

.form-actions {
  display: flex;
  align-items: center;
  gap: .75rem;
  margin-top: 1rem;
}

.form-status {
  font-size: .85rem;
  display: block;
}

.form-status.is-ok { color: #15803d; }
.form-status.is-error { color: #b91c1c; }

/* ---------- Responsive ---------- */

@media (max-width: 820px) {
  .layout { grid-template-columns: 1fr; }
  .sidebar { position: static; }
  .detail { grid-template-columns: 1fr; }
  .cart-link { margin-left: 0; }
  .admin-link { margin-left: 0; }
  .detail-wrap { overflow-x: auto; }
  .cart-table { min-width: 560px; }
  .admin-wrap { overflow-x: auto; }
  .admin-table { min-width: 1080px; }
  .detail-actions { flex-wrap: wrap; }
}