:root {
  --primary: #2563eb;
  --bg: #f8fafc;
  --sidebar-bg: #1e293b;
  --sidebar-text: #e2e8f0;
  --card-bg: #ffffff;
  --border: #e2e8f0;
  --text: #1e293b;
  --text-muted: #64748b;
  --radius: 8px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.hidden { display: none !important; }

.login-screen {
  position: fixed; inset: 0;
  display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, #1e293b, #334155);
}
.login-card {
  background: #fff; padding: 40px; border-radius: 16px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.3); text-align: center; width: 360px;
}
.login-card h1 { font-size: 24px; margin-bottom: 8px; }
.login-subtitle { color: var(--text-muted); margin-bottom: 24px; }
.login-card input {
  width: 100%; padding: 12px 16px; margin-bottom: 12px;
  border: 1px solid var(--border); border-radius: var(--radius); font-size: 15px;
}
.login-card input:focus { outline: none; border-color: var(--primary); }
.login-error { color: #dc2626; font-size: 14px; margin-top: 8px; min-height: 20px; }
.btn-primary {
  background: var(--primary); color: #fff; border: none;
  padding: 12px 24px; border-radius: var(--radius); cursor: pointer; font-size: 15px;
}

.app { display: flex; height: 100vh; overflow: hidden; }

.sidebar {
  width: 280px; background: var(--sidebar-bg); color: var(--sidebar-text);
  display: flex; flex-direction: column; flex-shrink: 0;
}
.sidebar-header { padding: 20px; border-bottom: 1px solid #334155; }
.sidebar-header h2 { font-size: 18px; }
.sidebar-search { padding: 12px 16px; }
.sidebar-search input {
  width: 100%; padding: 8px 12px; background: #334155; border: 1px solid #475569;
  border-radius: 6px; color: #fff; font-size: 13px;
}
.sidebar-search input:focus { outline: none; border-color: var(--primary); }
.category-tree { flex: 1; overflow-y: auto; padding: 8px; }
.cat-header {
  display: flex; align-items: center; padding: 8px 12px; border-radius: 6px;
  cursor: pointer;
}
.cat-header.active { background: var(--primary); }
.cat-toggle { width: 20px; font-size: 12px; cursor: pointer; }
.cat-toggle.open { transform: rotate(90deg); }
.cat-name { flex: 1; font-size: 14px; margin-left: 4px; }
.subcat-list { margin-left: 20px; margin-top: 4px; }
.subcat-item {
  display: flex; align-items: center; padding: 6px 12px; border-radius: 6px;
  cursor: pointer; font-size: 13px;
}
.subcat-item.active { background: var(--primary); }
.subcat-name { flex: 1; }

.main-content { flex: 1; display: flex; flex-direction: column; overflow: hidden; }
.main-header {
  display: flex; justify-content: space-between; align-items: center;
  padding: 16px 24px; background: #fff; border-bottom: 1px solid var(--border);
}
.header-left { display: flex; align-items: center; gap: 12px; }
.header-left h1 { font-size: 20px; }
.items-count { color: var(--text-muted); font-size: 14px; }
.header-right { display: flex; gap: 12px; align-items: center; }
.header-right input {
  padding: 8px 14px; border: 1px solid var(--border); border-radius: var(--radius);
  font-size: 14px; width: 240px;
}
.header-right input:focus { outline: none; border-color: var(--primary); }
.btn-logout {
  background: #f1f5f9; color: var(--text); border: 1px solid var(--border);
  padding: 8px 16px; border-radius: 6px; cursor: pointer; font-size: 13px;
}

.items-grid {
  flex: 1; overflow-y: auto; padding: 16px;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 240px));
  justify-content: start;
  gap: 12px;
  min-width: 0;
  min-height: 0;
  align-items: start;
}
.items-grid > * {
  min-width: 0;
}
.item-card {
  height: 280px;
  background: var(--card-bg); border-radius: 12px; overflow: hidden;
  border: 1px solid var(--border);
}
.item-card-img {
  width: 100%; height: 140px; object-fit: cover; background: #f1f5f9;
  display: block;
}
.item-card-noimg {
  width: 100%; height: 140px; display: flex; align-items: center; justify-content: center;
  background: #f1f5f9; color: var(--text-muted); font-size: 14px;
}
.item-card-body { padding: 8px 12px; }
.item-card-name { font-size: 14px; font-weight: 600; margin-bottom: 2px; }
.item-card-excel { font-size: 14px; color: var(--text-muted); margin-bottom: 2px; }
.item-card-qty { font-size: 14px; color: var(--text-muted); }

@media (max-width: 768px) {
  .sidebar { width: 200px; }
  .header-right input { width: 150px; }
}

/* Пагинация */
.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 6px;
  padding: 12px 16px 20px;
  flex-wrap: wrap;
}
.page-btn {
  min-width: 36px;
  height: 36px;
  border: 1px solid var(--border);
  background: var(--card-bg);
  color: var(--text);
  border-radius: 6px;
  cursor: pointer;
  font-size: 14px;
}
.page-btn:hover:not(.active):not(:disabled) {
  background: #f1f5f9;
  border-color: var(--primary);
}
.page-btn.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}
.page-btn:disabled {
  opacity: 0.4;
  cursor: default;
}
.page-dots {
  padding: 0 4px;
  color: var(--text-muted);
  font-size: 14px;
}


/* Lightbox */
.lightbox {
  position: fixed; inset: 0; background: rgba(0,0,0,0.9);
  display: flex; align-items: center; justify-content: center; z-index: 200;
  cursor: pointer;
}
.lightbox img {
  max-width: 90vw; max-height: 90vh; object-fit: contain; border-radius: 8px;
}
.lightbox-close {
  position: absolute; top: 16px; right: 24px; color: #fff; font-size: 36px;
  cursor: pointer; line-height: 1;
}
.item-card-img { cursor: zoom-in; }
.item-card-comment {
  font-size: 11px; color: var(--text-muted); font-style: italic;
  margin-top: 2px; line-height: 1.3;
}

/* Теги */
.tag-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 8px 16px 0;
}
.tag-filter:empty { display: none; }
.tag-filter-btn {
  background: #e0e7ff;
  color: #3730a3;
  border: none;
  padding: 4px 12px;
  border-radius: 16px;
  cursor: pointer;
  font-size: 13px;
  transition: background 0.15s;
}
.tag-filter-btn:hover { background: #c7d2fe; }
.tag-filter-btn.active { background: var(--primary); color: #fff; }
.tag-filter-btn.all { background: #f1f5f9; color: var(--text); }
.tag-filter-btn.all:hover { background: #e2e8f0; }
.tag-filter-btn.all.active { background: var(--primary); color: #fff; }
.item-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 3px;
  margin-top: 3px;
}
.tag-badge {
  background: #dbeafe;
  color: #1e40af;
  padding: 1px 7px;
  border-radius: 10px;
  font-size: 11px;
  white-space: nowrap;
}
/* ===== Мобильная версия ===== */
@media (max-width: 768px) {
  /* Экран входа */
  .login-card { width: auto; max-width: 360px; margin: 0 16px; padding: 28px 20px; }

  /* Каталог строится в столбик: категории сверху, позиции снизу */
  .app { flex-direction: column; }
  .sidebar { width: 100%; max-height: 38vh; }
  .sidebar-header { padding: 12px 16px; }
  .sidebar-header h2 { font-size: 16px; }
  .sidebar-search { padding: 8px 12px; }
  .category-tree { padding: 6px; }

  .main-content { flex: 1; min-height: 0; }
  .main-header { padding: 10px 12px; gap: 8px; flex-wrap: wrap; }
  .header-left { gap: 8px; min-width: 0; }
  .header-left h1 { font-size: 16px; }
  .header-right { flex: 1; min-width: 0; }
  .header-right input { flex: 1; width: auto; min-width: 0; }
  .btn-logout { padding: 8px 10px; }

  /* Сетка: две карточки в ряд */
  .items-grid { padding: 10px; gap: 8px; grid-template-columns: repeat(2, 1fr); }
  .item-card {height: 280px; }
  .item-card-img, .item-card-noimg { height: 110px; }
  .item-card-body { padding: 6px 8px; }
  .item-card-name { font-size: 12px; }
  .item-card-excel, .item-card-qty { font-size: 11px; }
  .item-card-comment { font-size: 10px; }

  .tag-filter { padding: 6px 10px 0; }
  .tag-filter-btn { font-size: 12px; padding: 3px 10px; }

  .pagination { padding: 8px 10px 14px; }
  .page-btn { min-width: 32px; height: 34px; font-size: 13px; }

  .lightbox-close { top: 8px; right: 12px; font-size: 30px; }
}
.menu-toggle { display: none; background: #334155; color: #fff; border: none;
  border-radius: 8px; padding: 8px 14px; font-size: 18px; cursor: pointer; }
@media (max-width: 768px) {
  .menu-toggle { display: block; }
  .sidebar { position: fixed; top: 0; bottom: 0; left: 0; z-index: 150;
    width: 280px; max-width: 82vw; transform: translateX(-100%); transition: transform .2s ease; }
  .sidebar.open { transform: none; box-shadow: 0 0 40px rgba(0,0,0,.4); }
}