*{margin:0;padding:0;box-sizing:border-box}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei",sans-serif;background:#f1f5f9;color:#334155}
:root{--primary:#2563eb;--primary-dark:#1d4ed8;--sidebar-bg:#1e293b;--sidebar-hover:#334155;--danger:#ef4444;--success:#10b981;--warning:#f59e0b}

/* 登录 */
.login-container{display:flex;align-items:center;justify-content:center;min-height:100vh;background:linear-gradient(135deg,#1e293b,#1e3a5f)}
.login-card{background:#fff;border-radius:16px;padding:48px 40px;width:400px;box-shadow:0 20px 60px rgba(0,0,0,.3)}
.login-header{text-align:center;margin-bottom:32px}
.logo-icon{font-size:48px}.login-header h1{font-size:22px;color:#1e293b}.login-header p{color:#94a3b8;font-size:14px}
.form-group{margin-bottom:14px}.form-group label{display:block;margin-bottom:4px;font-size:13px;font-weight:600;color:#475569}
.form-group input,.form-group select,.form-group textarea{width:100%;padding:10px 14px;border:1px solid #e2e8f0;border-radius:8px;font-size:14px;background:#fff}
.form-group input:focus,.form-group select:focus,.form-group textarea:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px rgba(37,99,235,.1)}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.btn-primary{background:var(--primary);color:#fff;border:none;padding:10px 24px;border-radius:8px;font-size:14px;font-weight:600;cursor:pointer}
.btn-primary:hover{background:var(--primary-dark)}
.btn-full{width:100%;padding:12px}
.btn-outline{background:#fff;color:#475569;border:1px solid #e2e8f0;padding:8px 16px;border-radius:8px;font-size:13px;cursor:pointer}
.btn-sm{padding:6px 14px;font-size:12px}.btn-xs{padding:4px 10px;font-size:11px;border-radius:4px}
.error-msg{color:var(--danger);font-size:13px;min-height:20px}
.required{color:var(--danger)}

/* 主布局 */
.main-container{display:flex;min-height:100vh}
.sidebar{width:220px;background:var(--sidebar-bg);display:flex;flex-direction:column;flex-shrink:0;transition:width .2s}
.sidebar.collapsed{width:60px}
.sidebar-logo{padding:16px;display:flex;align-items:center;gap:8px;color:#fff;border-bottom:1px solid #334155}
.logo-icon-sm{font-size:20px}.logo-text{font-size:14px;font-weight:600;white-space:nowrap;overflow:hidden}
.sidebar.collapsed .logo-text,.sidebar.collapsed .nav-item span:not(.nav-icon),.sidebar.collapsed .arrow,.sidebar.collapsed .sidebar-footer span{display:none}
.sidebar-nav{flex:1;padding:8px 0;overflow-y:auto}
.nav-item{padding:10px 16px;display:flex;align-items:center;gap:8px;color:#94a3b8;cursor:pointer;font-size:13px;transition:.15s;border-left:3px solid transparent}
.nav-item:hover{background:var(--sidebar-hover);color:#fff}
.nav-item.active{background:var(--sidebar-hover);color:#fff;border-left-color:var(--primary)}
.nav-icon{font-size:16px;width:20px;text-align:center}
.arrow{margin-left:auto;font-size:10px;transition:.2s}
.nav-parent.open .arrow{transform:rotate(180deg)}
.submenu{max-height:0;overflow:hidden;transition:max-height .3s}
.submenu.open{max-height:300px}
.sub-item{padding-left:44px;font-size:12px}
.sidebar-footer{padding:12px 16px;border-top:1px solid #334155;display:flex;align-items:center;justify-content:space-between}
.sidebar-footer span{color:#64748b;font-size:11px;overflow:hidden;white-space:nowrap}
.btn-logout{background:transparent;color:#94a3b8;border:1px solid #475569;padding:4px 10px;border-radius:4px;font-size:11px;cursor:pointer}.btn-logout:hover{color:#fff}

/* 内容区 */
.content-area{flex:1;overflow-y:auto;padding:20px 28px}
.page{display:none}.page.active{display:block}
.topbar{display:flex;align-items:center;justify-content:space-between;margin-bottom:20px}
.topbar h2{font-size:22px;color:#1e293b}

/* 统计 */
.stats-row{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px;margin-bottom:20px}
.stat-card{background:#fff;border-radius:10px;padding:16px;text-align:center;border-left:4px solid var(--primary);box-shadow:0 1px 3px rgba(0,0,0,.04)}
.stat-value{font-size:24px;font-weight:700}.stat-label{font-size:12px;color:#94a3b8;margin-top:2px}

/* 工具栏 */
.toolbar{display:flex;gap:10px;margin-bottom:14px}
.search-input{flex:1;max-width:300px;padding:9px 14px;border:1px solid #e2e8f0;border-radius:8px;font-size:13px}
.search-input:focus{outline:none;border-color:var(--primary)}
.filter-select{padding:9px 14px;border:1px solid #e2e8f0;border-radius:8px;font-size:13px;background:#fff}

/* 表格 */
.table-wrap{background:#fff;border-radius:10px;overflow:hidden;box-shadow:0 1px 3px rgba(0,0,0,.04)}
table{width:100%;border-collapse:collapse;font-size:13px}
th{background:#f8fafc;padding:12px 14px;text-align:left;font-size:12px;font-weight:700;color:#64748b}
td{padding:10px 14px;border-bottom:1px solid #f1f5f9}
tr:hover{background:#f8fafc}
.badge{display:inline-block;padding:3px 10px;border-radius:12px;font-size:12px;font-weight:600}
.badge-active{background:#d1fae5;color:#065f46}
.badge-inactive{background:#f1f5f9;color:#94a3b8}
.action-btns{display:flex;gap:6px}
.btn-edit{background:#eff6ff;color:var(--primary);border:none;padding:5px 12px;border-radius:5px;font-size:12px;cursor:pointer}
.btn-edit:hover{background:#dbeafe}
.btn-del{background:#fef2f2;color:var(--danger);border:none;padding:5px 12px;border-radius:5px;font-size:12px;cursor:pointer}
.btn-del:hover{background:#fee2e2}

/* 弹窗 */
.modal-overlay{position:fixed;inset:0;background:rgba(0,0,0,.5);z-index:1000;display:flex;align-items:center;justify-content:center;backdrop-filter:blur(3px)}
.modal{background:#fff;border-radius:14px;width:650px;max-height:85vh;overflow-y:auto;box-shadow:0 20px 60px rgba(0,0,0,.2);padding:28px}
.modal h3{margin-bottom:18px;font-size:18px}
.modal-footer{display:flex;justify-content:flex-end;gap:10px;margin-top:20px;padding-top:16px;border-top:1px solid #f1f5f9}
.spec-row{display:flex;gap:8px;align-items:center;margin-bottom:8px;flex-wrap:wrap}
.spec-row input{flex:1;min-width:80px}
.spec-tag{display:inline-flex;align-items:center;gap:4px;background:#eff6ff;padding:3px 10px;border-radius:12px;font-size:12px;margin:2px}
.spec-tag button{background:none;border:none;color:var(--primary);cursor:pointer;font-size:14px;padding:0 2px}
.product-img-preview{width:120px;height:120px;object-fit:cover;border-radius:8px;border:1px solid #e2e8f0;margin-top:8px}

.pagination{display:flex;justify-content:center;gap:6px;margin-top:16px}
.pagination button{padding:6px 12px;border:1px solid #e2e8f0;background:#fff;border-radius:5px;font-size:13px;cursor:pointer}
.pagination button.active{background:var(--primary);color:#fff;border-color:var(--primary)}

@media(max-width:768px){
  .sidebar{width:60px}.sidebar .logo-text,.sidebar .nav-item span:not(.nav-icon),.sidebar .arrow{display:none}
  .content-area{padding:16px}.form-row{grid-template-columns:1fr}.modal{width:95%;margin:10px}
}