/* ============================================================
   BioTech Product CMS — Main Stylesheet
   Version 1.0.0
   ============================================================ */

:root {
  --primary:      #0066b2;
  --primary-dark: #004d8a;
  --primary-light:#e8f2fb;
  --accent:       #00a6e0;
  --success:      #28a745;
  --warning:      #ffc107;
  --danger:       #dc3545;
  --text-primary: #1a1a2e;
  --text-secondary:#555e6a;
  --text-muted:   #8a94a0;
  --bg-body:      #f4f6f9;
  --bg-white:     #ffffff;
  --bg-light:     #f8fafb;
  --border:       #e2e8f0;
  --border-light: #edf2f7;
  --shadow-sm:    0 1px 3px rgba(0,0,0,.06),0 1px 2px rgba(0,0,0,.04);
  --shadow:       0 4px 12px rgba(0,0,0,.08);
  --shadow-lg:    0 8px 30px rgba(0,0,0,.12);
  --radius:       8px;
  --radius-sm:    5px;
  --radius-lg:    14px;
  --transition:   .2s ease;
  --font-sans:    'Inter','Noto Sans SC','PingFang SC','Microsoft YaHei',sans-serif;
  --header-h:     64px;
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-font-smoothing:antialiased}
body{font-family:var(--font-sans);font-size:14px;line-height:1.6;color:var(--text-primary);background:var(--bg-body)}
a{color:var(--primary);text-decoration:none;transition:color var(--transition)}
a:hover{color:var(--primary-dark)}
img{max-width:100%;height:auto;display:block}
ul{list-style:none}

/* ── Typography ─────────────────────────────────────── */
h1{font-size:2rem;font-weight:700;line-height:1.25}
h2{font-size:1.5rem;font-weight:600;line-height:1.3}
h3{font-size:1.2rem;font-weight:600}
h4{font-size:1rem;font-weight:600}
.text-muted{color:var(--text-muted)!important}
.text-primary-color{color:var(--primary)!important}

/* ── Layout ──────────────────────────────────────────── */
.container{max-width:1240px;margin:0 auto;padding:0 20px}
.container-fluid{padding:0 20px}
.page-wrapper{min-height:100vh;display:flex;flex-direction:column}
.page-wrapper > main{flex:1}
.content-grid{display:grid;grid-template-columns:260px 1fr;gap:28px;align-items:start}

/* ── Header ─────────────────────────────────────────── */
#site-header{
  position:sticky;top:0;z-index:999;
  height:var(--header-h);background:var(--bg-white);
  border-bottom:1px solid var(--border-light);
  box-shadow:var(--shadow-sm);
}
.header-inner{
  display:flex;align-items:center;justify-content:space-between;
  height:100%;gap:20px;
}
.site-logo{display:flex;align-items:center;gap:10px;text-decoration:none}
.site-logo-mark{
  width:36px;height:36px;border-radius:8px;
  background:linear-gradient(135deg,var(--primary),var(--accent));
  display:flex;align-items:center;justify-content:center;
  color:#fff;font-weight:800;font-size:16px;letter-spacing:-1px;flex-shrink:0;
}
.site-logo-text{font-size:1.05rem;font-weight:700;color:var(--text-primary);line-height:1.2}
.site-logo-text span{display:block;font-size:.7rem;font-weight:400;color:var(--text-muted)}

/* Nav */
.main-nav{display:flex;align-items:center;gap:4px}
.main-nav a{
  padding:6px 14px;border-radius:var(--radius-sm);
  font-size:.875rem;font-weight:500;color:var(--text-secondary);
  transition:all var(--transition);
}
.main-nav a:hover,.main-nav a.active{color:var(--primary);background:var(--primary-light)}

/* Header actions */
.header-actions{display:flex;align-items:center;gap:8px}
.btn-icon{
  width:36px;height:36px;border:none;background:transparent;cursor:pointer;
  border-radius:var(--radius-sm);display:flex;align-items:center;justify-content:center;
  color:var(--text-secondary);transition:all var(--transition);
}
.btn-icon:hover{background:var(--bg-light);color:var(--primary)}

/* Search bar */
.header-search{position:relative}
.header-search input{
  width:220px;height:36px;padding:0 36px 0 12px;
  border:1px solid var(--border);border-radius:var(--radius-sm);
  font-size:.875rem;color:var(--text-primary);background:var(--bg-light);
  transition:all var(--transition);
}
.header-search input:focus{outline:none;border-color:var(--primary);background:#fff;width:260px}
.header-search .search-icon{
  position:absolute;right:10px;top:50%;transform:translateY(-50%);
  color:var(--text-muted);pointer-events:none;font-size:14px;
}

/* Language dropdown */
.lang-dropdown{position:relative}
.lang-btn{
  display:flex;align-items:center;gap:6px;padding:5px 10px;
  border:1px solid var(--border);border-radius:var(--radius-sm);cursor:pointer;
  font-size:.825rem;font-weight:500;color:var(--text-secondary);
  background:var(--bg-white);transition:all var(--transition);
}
.lang-btn:hover{border-color:var(--primary);color:var(--primary)}
.lang-btn .flag{font-size:16px}
.lang-menu{
  position:absolute;top:calc(100% + 6px);right:0;
  background:var(--bg-white);border:1px solid var(--border);border-radius:var(--radius);
  box-shadow:var(--shadow);min-width:160px;z-index:200;
  opacity:0;visibility:hidden;transform:translateY(-4px);
  transition:all var(--transition);
}
.lang-dropdown:hover .lang-menu,
.lang-dropdown.open .lang-menu{opacity:1;visibility:visible;transform:translateY(0)}
.lang-menu a{
  display:flex;align-items:center;gap:8px;padding:8px 14px;
  font-size:.85rem;color:var(--text-secondary);transition:all var(--transition);
}
.lang-menu a:hover{background:var(--primary-light);color:var(--primary)}
.lang-menu a.current{color:var(--primary);font-weight:600;background:var(--primary-light)}

/* User menu */
.user-menu-wrap{position:relative}
.user-avatar{
  width:34px;height:34px;border-radius:50%;cursor:pointer;
  background:var(--primary);color:#fff;font-weight:600;font-size:.85rem;
  display:flex;align-items:center;justify-content:center;border:2px solid var(--border);
}
.user-dropdown{
  position:absolute;top:calc(100% + 8px);right:0;
  background:var(--bg-white);border:1px solid var(--border);border-radius:var(--radius);
  box-shadow:var(--shadow);min-width:180px;z-index:200;
  opacity:0;visibility:hidden;transform:translateY(-4px);
  transition:all var(--transition);
}
.user-menu-wrap:hover .user-dropdown{opacity:1;visibility:visible;transform:translateY(0)}
.user-dropdown .ud-header{padding:12px 14px;border-bottom:1px solid var(--border-light)}
.user-dropdown .ud-header strong{display:block;font-size:.9rem}
.user-dropdown .ud-header span{font-size:.78rem;color:var(--text-muted)}
.user-dropdown a,.user-dropdown button{
  display:flex;align-items:center;gap:8px;padding:8px 14px;
  width:100%;font-size:.85rem;color:var(--text-secondary);
  border:none;background:none;cursor:pointer;transition:all var(--transition);text-align:left;
}
.user-dropdown a:hover,.user-dropdown button:hover{background:var(--bg-light);color:var(--primary)}
.user-dropdown .divider{border:none;border-top:1px solid var(--border-light);margin:4px 0}

/* Hamburger */
.hamburger{display:none;flex-direction:column;gap:5px;cursor:pointer;padding:6px}
.hamburger span{display:block;width:22px;height:2px;background:var(--text-secondary);border-radius:2px;transition:all .3s}
.mobile-nav{
  display:none;position:fixed;top:var(--header-h);left:0;right:0;
  background:var(--bg-white);border-bottom:1px solid var(--border);
  box-shadow:var(--shadow);z-index:998;padding:16px 20px;
}
.mobile-nav.open{display:block}
.mobile-nav a{display:block;padding:10px 0;border-bottom:1px solid var(--border-light);color:var(--text-secondary)}

/* ── Sidebar Category ────────────────────────────────── */
.sidebar-cat{
  background:var(--bg-white);border:1px solid var(--border);
  border-radius:var(--radius-lg);overflow:hidden;
  position:sticky;top:calc(var(--header-h) + 16px);
}
.sidebar-cat .cat-header{
  padding:14px 16px;background:var(--primary);color:#fff;
  font-size:.875rem;font-weight:600;display:flex;align-items:center;gap:8px;
}
.cat-list{padding:8px 0}
.cat-item a{
  display:flex;align-items:center;gap:10px;padding:9px 16px;
  font-size:.875rem;color:var(--text-secondary);transition:all var(--transition);
}
.cat-item a:hover,.cat-item a.active{
  background:var(--primary-light);color:var(--primary);font-weight:500;
}
.cat-item a .cat-icon{width:18px;text-align:center;color:var(--text-muted)}
.cat-item a.active .cat-icon{color:var(--primary)}
.cat-item a .cat-count{
  margin-left:auto;background:var(--border-light);color:var(--text-muted);
  font-size:.72rem;padding:1px 7px;border-radius:20px;
}
.cat-item a.active .cat-count{background:var(--primary);color:#fff}
.cat-children{padding-left:16px;display:none}
.cat-item.open > .cat-children{display:block}
.cat-children a{font-size:.825rem;padding:7px 14px}

/* ── Buttons ──────────────────────────────────────────── */
.btn{
  display:inline-flex;align-items:center;gap:6px;
  padding:8px 18px;border-radius:var(--radius-sm);
  font-size:.875rem;font-weight:500;border:1.5px solid transparent;
  cursor:pointer;transition:all var(--transition);line-height:1;
}
.btn-primary{background:var(--primary);color:#fff;border-color:var(--primary)}
.btn-primary:hover{background:var(--primary-dark);border-color:var(--primary-dark);color:#fff}
.btn-outline{background:transparent;color:var(--primary);border-color:var(--primary)}
.btn-outline:hover{background:var(--primary);color:#fff}
.btn-light{background:var(--bg-light);color:var(--text-secondary);border-color:var(--border)}
.btn-light:hover{background:var(--border-light)}
.btn-danger{background:var(--danger);color:#fff;border-color:var(--danger)}
.btn-danger:hover{background:#b02a37}
.btn-sm{padding:5px 12px;font-size:.8rem}
.btn-lg{padding:11px 28px;font-size:1rem}
.btn-full{width:100%;justify-content:center}

/* ── Cards ─────────────────────────────────────────────── */
.card{
  background:var(--bg-white);border:1px solid var(--border);
  border-radius:var(--radius-lg);overflow:hidden;
  transition:box-shadow var(--transition),transform var(--transition);
}
.card:hover{box-shadow:var(--shadow-lg);transform:translateY(-2px)}
.card-body{padding:16px}
.card-footer{padding:12px 16px;border-top:1px solid var(--border-light);background:var(--bg-light)}

/* Product card */
.product-card{}
.product-card .product-img{
  position:relative;aspect-ratio:4/3;overflow:hidden;background:#f0f4f8;
}
.product-card .product-img img{
  width:100%;height:100%;object-fit:cover;transition:transform .4s ease;
}
.product-card:hover .product-img img{transform:scale(1.04)}
.product-card .badge-featured{
  position:absolute;top:10px;left:10px;
  background:var(--warning);color:#333;font-size:.7rem;font-weight:700;
  padding:2px 8px;border-radius:20px;
}
.product-card .product-body{padding:14px}
.product-card .product-cat{
  font-size:.72rem;font-weight:600;color:var(--primary);
  text-transform:uppercase;letter-spacing:.5px;margin-bottom:4px;
}
.product-card .product-name{
  font-size:.9rem;font-weight:600;color:var(--text-primary);
  line-height:1.4;margin-bottom:6px;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
}
.product-card .product-sku{font-size:.75rem;color:var(--text-muted);margin-bottom:8px}
.product-card .product-desc{
  font-size:.8rem;color:var(--text-secondary);line-height:1.5;margin-bottom:10px;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
}
.product-card .product-footer{
  display:flex;align-items:center;justify-content:space-between;
  padding:10px 14px;border-top:1px solid var(--border-light);background:var(--bg-light);
}
.product-card .product-price{font-size:1rem;font-weight:700;color:var(--primary)}
.product-card .stock-badge{
  font-size:.72rem;padding:2px 8px;border-radius:20px;font-weight:500;
}
.stock-in{background:#d4edda;color:#155724}
.stock-out{background:#f8d7da;color:#721c24}

/* Products Grid */
.products-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:20px}

/* ── Hero Banner ─────────────────────────────────────── */
.hero{
  background:linear-gradient(135deg,var(--primary) 0%,var(--accent) 100%);
  color:#fff;padding:80px 0;position:relative;overflow:hidden;
}
.hero::after{
  content:'';position:absolute;right:-60px;top:-60px;
  width:400px;height:400px;border-radius:50%;
  background:rgba(255,255,255,.06);
}
.hero::before{
  content:'';position:absolute;left:-80px;bottom:-80px;
  width:300px;height:300px;border-radius:50%;
  background:rgba(255,255,255,.04);
}
.hero-inner{position:relative;z-index:1}
.hero h1{font-size:2.4rem;margin-bottom:14px;font-weight:800}
.hero p{font-size:1.1rem;opacity:.9;margin-bottom:28px;max-width:560px}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap}

/* ── Section ──────────────────────────────────────────── */
.section{padding:56px 0}
.section-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:28px}
.section-header h2{position:relative;padding-left:14px}
.section-header h2::before{
  content:'';position:absolute;left:0;top:50%;transform:translateY(-50%);
  width:4px;height:70%;background:var(--primary);border-radius:2px;
}

/* ── Breadcrumb ──────────────────────────────────────── */
.breadcrumb{
  display:flex;align-items:center;flex-wrap:wrap;gap:6px;
  padding:14px 0;font-size:.82rem;color:var(--text-muted);
}
.breadcrumb a{color:var(--text-secondary)}
.breadcrumb a:hover{color:var(--primary)}
.breadcrumb .sep{color:var(--border)}

/* ── Pagination ──────────────────────────────────────── */
.pagination{display:flex;align-items:center;justify-content:center;gap:4px;margin-top:32px}
.pagination a,.pagination span{
  display:flex;align-items:center;justify-content:center;
  width:34px;height:34px;border-radius:var(--radius-sm);
  font-size:.85rem;border:1px solid var(--border);color:var(--text-secondary);
  transition:all var(--transition);
}
.pagination a:hover{background:var(--primary-light);border-color:var(--primary);color:var(--primary)}
.pagination .active{background:var(--primary);border-color:var(--primary);color:#fff}
.pagination .disabled{opacity:.4;pointer-events:none}

/* ── Forms ────────────────────────────────────────────── */
.form-group{margin-bottom:18px}
.form-label{display:block;margin-bottom:6px;font-size:.875rem;font-weight:500;color:var(--text-primary)}
.form-label .req{color:var(--danger)}
.form-control{
  display:block;width:100%;padding:9px 12px;
  border:1.5px solid var(--border);border-radius:var(--radius-sm);
  font-size:.875rem;color:var(--text-primary);background:var(--bg-white);
  transition:border-color var(--transition),box-shadow var(--transition);
  font-family:inherit;
}
.form-control:focus{
  outline:none;border-color:var(--primary);
  box-shadow:0 0 0 3px rgba(0,102,178,.12);
}
.form-control::placeholder{color:var(--text-muted)}
.form-control.is-invalid{border-color:var(--danger)}
.invalid-feedback{font-size:.8rem;color:var(--danger);margin-top:4px}
select.form-control{cursor:pointer}
textarea.form-control{resize:vertical;min-height:100px}

/* ── Alerts ───────────────────────────────────────────── */
.alert{
  padding:12px 16px;border-radius:var(--radius-sm);
  font-size:.875rem;margin-bottom:18px;
  display:flex;align-items:flex-start;gap:10px;
}
.alert-success{background:#d4edda;color:#155724;border:1px solid #c3e6cb}
.alert-error,.alert-danger{background:#f8d7da;color:#721c24;border:1px solid #f5c6cb}
.alert-info{background:#d1ecf1;color:#0c5460;border:1px solid #bee5eb}
.alert-warning{background:#fff3cd;color:#856404;border:1px solid #ffeeba}

/* ── Table ────────────────────────────────────────────── */
.table-wrap{overflow-x:auto;border-radius:var(--radius);border:1px solid var(--border)}
table{width:100%;border-collapse:collapse;font-size:.875rem}
table th{
  background:var(--bg-light);padding:10px 14px;
  text-align:left;font-weight:600;color:var(--text-secondary);
  border-bottom:1px solid var(--border);white-space:nowrap;
}
table td{padding:10px 14px;border-bottom:1px solid var(--border-light);color:var(--text-primary);vertical-align:middle}
table tr:last-child td{border-bottom:none}
table tr:hover td{background:var(--bg-light)}
.badge{
  display:inline-block;padding:2px 8px;border-radius:20px;
  font-size:.72rem;font-weight:600;
}
.badge-primary{background:var(--primary-light);color:var(--primary)}
.badge-success{background:#d4edda;color:#155724}
.badge-danger{background:#f8d7da;color:#721c24}
.badge-warning{background:#fff3cd;color:#856404}
.badge-secondary{background:var(--bg-light);color:var(--text-secondary)}

/* ── Product Detail Page ──────────────────────────────── */
.product-detail-wrap{background:var(--bg-white);border:1px solid var(--border);border-radius:var(--radius-lg);padding:32px}
.product-gallery{border-radius:var(--radius);overflow:hidden;background:#f0f4f8;aspect-ratio:1;display:flex;align-items:center;justify-content:center}
.product-gallery img{max-width:100%;max-height:100%;object-fit:contain}
.product-placeholder{font-size:5rem;color:var(--border)}
.product-info-block{padding:0 8px}
.product-info-block .category-tag{
  display:inline-block;background:var(--primary-light);color:var(--primary);
  font-size:.75rem;font-weight:600;padding:3px 10px;border-radius:20px;margin-bottom:12px;
}
.product-info-block h1{font-size:1.6rem;margin-bottom:8px}
.product-info-block .sku-line{font-size:.82rem;color:var(--text-muted);margin-bottom:18px}
.price-block{display:flex;align-items:center;gap:12px;margin-bottom:20px;padding:16px;background:var(--bg-light);border-radius:var(--radius)}
.price-block .price-main{font-size:1.6rem;font-weight:700;color:var(--primary)}
.spec-table{width:100%;border-collapse:collapse;margin-top:12px}
.spec-table tr:nth-child(even) td:first-child,.spec-table tr:nth-child(even) th{background:#f8fafb}
.spec-table th{width:140px;text-align:left;padding:8px 12px;font-weight:500;color:var(--text-secondary);font-size:.85rem;border:1px solid var(--border-light)}
.spec-table td{padding:8px 12px;font-size:.875rem;border:1px solid var(--border-light)}

/* Tabs */
.tabs{border-bottom:1px solid var(--border);display:flex;gap:0;margin-bottom:24px}
.tab-btn{
  padding:10px 20px;cursor:pointer;font-size:.9rem;font-weight:500;
  color:var(--text-secondary);border:none;background:none;
  border-bottom:2.5px solid transparent;margin-bottom:-1px;transition:all var(--transition);
}
.tab-btn.active{color:var(--primary);border-bottom-color:var(--primary)}
.tab-content{display:none}
.tab-content.active{display:block}

/* ── Auth Pages ──────────────────────────────────────── */
.auth-wrap{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:20px;background:var(--bg-body)}
.auth-card{background:var(--bg-white);border:1px solid var(--border);border-radius:var(--radius-lg);padding:40px;width:100%;max-width:420px;box-shadow:var(--shadow)}
.auth-logo{text-align:center;margin-bottom:28px}
.auth-logo .logo-mark{width:48px;height:48px;border-radius:12px;background:linear-gradient(135deg,var(--primary),var(--accent));display:flex;align-items:center;justify-content:center;color:#fff;font-weight:800;font-size:22px;margin:0 auto 10px}
.auth-logo h2{font-size:1.1rem;color:var(--text-primary)}
.auth-logo p{font-size:.85rem;color:var(--text-muted);margin-top:4px}

/* ── Contact Page ────────────────────────────────────── */
.contact-info-card{background:linear-gradient(135deg,var(--primary),var(--accent));color:#fff;border-radius:var(--radius-lg);padding:32px}
.contact-info-card h3{font-size:1.2rem;margin-bottom:20px;opacity:.95}
.contact-info-item{display:flex;align-items:flex-start;gap:12px;margin-bottom:18px}
.contact-info-item .icon{width:36px;height:36px;border-radius:8px;background:rgba(255,255,255,.2);display:flex;align-items:center;justify-content:center;flex-shrink:0}
.contact-info-item .text strong{display:block;font-size:.85rem;opacity:.8}
.contact-info-item .text span{font-size:.9rem}

/* ── Footer ──────────────────────────────────────────── */
#site-footer{background:#1a2332;color:#a0aab5;padding:56px 0 0}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;padding-bottom:40px}
.footer-brand .logo-mark{
  width:40px;height:40px;border-radius:10px;
  background:linear-gradient(135deg,var(--primary),var(--accent));
  display:flex;align-items:center;justify-content:center;
  color:#fff;font-weight:800;font-size:18px;margin-bottom:14px;
}
.footer-brand h3{color:#fff;font-size:1rem;margin-bottom:8px}
.footer-brand p{font-size:.83rem;line-height:1.7}
.footer-col h4{color:#fff;font-size:.9rem;font-weight:600;margin-bottom:16px}
.footer-col ul li{margin-bottom:8px}
.footer-col ul a{font-size:.85rem;color:#a0aab5;transition:color var(--transition)}
.footer-col ul a:hover{color:#fff}
.footer-bottom{
  border-top:1px solid #2d3748;padding:18px 0;
  display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:10px;
}
.footer-bottom p{font-size:.8rem}
.footer-bottom .version-tag{
  font-size:.75rem;background:#2d3748;color:#718096;
  padding:2px 10px;border-radius:20px;
}

/* ── Utils ───────────────────────────────────────────── */
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);border:0}
.d-flex{display:flex}.d-grid{display:grid}.gap-1{gap:4px}.gap-2{gap:8px}.gap-3{gap:12px}.gap-4{gap:16px}
.align-center{align-items:center}.justify-between{justify-content:space-between}.flex-wrap{flex-wrap:wrap}
.mt-1{margin-top:4px}.mt-2{margin-top:8px}.mt-3{margin-top:12px}.mt-4{margin-top:16px}.mt-5{margin-top:24px}
.mb-1{margin-bottom:4px}.mb-2{margin-bottom:8px}.mb-3{margin-bottom:12px}.mb-4{margin-bottom:16px}.mb-5{margin-bottom:24px}
.p-0{padding:0}.text-center{text-align:center}.text-right{text-align:right}.fw-600{font-weight:600}
.w-100{width:100%}.rounded{border-radius:var(--radius)}.shadow{box-shadow:var(--shadow)}

/* ── Responsive ──────────────────────────────────────── */
@media(max-width:1024px){
  .content-grid{grid-template-columns:220px 1fr;gap:20px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:28px}
}
@media(max-width:768px){
  :root{--header-h:56px}
  .main-nav,.header-search{display:none}
  .hamburger{display:flex}
  .content-grid{grid-template-columns:1fr}
  .sidebar-cat{position:static}
  .hero h1{font-size:1.7rem}
  .hero{padding:52px 0}
  .footer-grid{grid-template-columns:1fr 1fr;gap:24px}
  .footer-bottom{flex-direction:column;text-align:center}
  h1{font-size:1.5rem}
  h2{font-size:1.25rem}
}
@media(max-width:480px){
  .footer-grid{grid-template-columns:1fr}
  .products-grid{grid-template-columns:1fr}
  .auth-card{padding:28px 20px}
  .hero-actions{flex-direction:column}
}