:root { 
            --primary-bg: #f3f4f6; 
            --sidebar-bg: #ffffff; 
            --text-main: #1e293b; 
            --text-light: #64748b; 
            --accent-teal: #0ea5e9;
            --accent-indigo: #6366f1; /* رنگ بنفش برای تخت روز */
            --table-header-bg: #e0e7ff; /* هدر جدول متناسب با تم */
            --border-color: #e2e8f0; 
            --transition-speed: 0.3s;
        }

        * { box-sizing: border-box; margin: 0; padding: 0; font-family: 'Vazirmatn', 'Segoe UI', sans-serif; text-decoration: none; outline: none; -webkit-tap-highlight-color: transparent; }

        body { background-color: var(--primary-bg); color: var(--text-main); display: flex; height: 100vh; overflow: hidden; }

        /* --- Mobile Menu --- */
        .mobile-menu-btn { display: none; position: fixed; top: 20px; right: 20px; z-index: 1001; background: white; border: none; width: 45px; height: 45px; border-radius: 12px; box-shadow: 0 4px 15px rgba(0,0,0,0.1); color: var(--accent-indigo); font-size: 20px; cursor: pointer; align-items: center; justify-content: center; }
        .overlay { display: none; position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0, 0, 0, 0.4); backdrop-filter: blur(2px); z-index: 1002; }
        .overlay.active { display: block; }

        /* --- Sidebar --- */
        .sidebar { width: 260px; background-color: var(--sidebar-bg); border-left: 1px solid var(--border-color); display: flex; flex-direction: column; padding: 20px; z-index: 1000; transition: transform var(--transition-speed); flex-shrink: 0; height: 100vh; }
        .sidebar.active { transform: translateX(0); }
        .brand-logo { font-size: 22px; font-weight: 800; color: var(--accent-teal); display: flex; align-items: center; justify-content: center; gap: 10px; margin-bottom: 40px; padding-bottom: 20px; border-bottom: 1px solid #f1f5f9; }
        .nav-menu { display: flex; flex-direction: column; gap: 10px; flex: 1; overflow-y: auto; }
        .nav-item { display: flex; align-items: center; gap: 12px; padding: 12px 15px; border-radius: 12px; color: var(--text-light); font-weight: 500; font-size: 14px; transition: 0.2s; white-space: nowrap; }
        .nav-item:hover { background-color: #f1f5f9; color: var(--accent-teal); transform: translateX(-5px); }
        .nav-item i { width: 20px; text-align: center; font-size: 18px; }
        .sidebar-footer { margin-top: auto; border-top: 1px solid #f1f5f9; padding-top: 20px; display: flex; align-items: center; gap: 10px; }
        .user-avatar { width: 40px; height: 40px; background: #e0f2fe; color: #0284c7; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: bold; flex-shrink: 0; }

        /* --- Main Content --- */
        .main-content { flex: 1; padding: 30px; overflow-y: auto; display: flex; flex-direction: column; gap: 20px; scroll-behavior: smooth; }

        .page-header { display: flex; align-items: center; gap: 15px; margin-bottom: 10px; }
        .back-btn { width: 40px; height: 40px; border-radius: 50%; background: white; display: flex; align-items: center; justify-content: center; color: var(--text-main); box-shadow: 0 2px 5px rgba(0,0,0,0.1); transition: 0.2s; cursor: pointer; flex-shrink: 0; }
        .back-btn:hover { background-color: var(--accent-indigo); color: white; transform: translateX(3px); }
        .page-title { font-size: 24px; font-weight: 800; color: var(--text-main); }

        /* --- Filters (Grade & Search) --- */
        .filter-wrapper {
            background: white;
            padding: 15px;
            border-radius: 16px;
            display: flex;
            flex-direction: column;
            gap: 15px;
            box-shadow: 0 4px 6px -1px rgba(0,0,0,0.05);
        }

        .search-box { position: relative; width: 100%; }
        .search-box input { width: 100%; padding: 12px 40px 12px 15px; border: 2px solid #e2e8f0; border-radius: 12px; font-size: 14px; transition: 0.3s; }
        .search-box input:focus { border-color: var(--accent-indigo); }
        .search-box i { position: absolute; right: 15px; top: 50%; transform: translateY(-50%); color: #94a3b8; }

        .grade-filters { display: flex; gap: 10px; overflow-x: auto; padding-bottom: 5px; -ms-overflow-style: none; scrollbar-width: none; }
        .grade-filters::-webkit-scrollbar { display: none; }

        .filter-chip {
            padding: 10px 20px;
            background: #f1f5f9;
            border-radius: 10px;
            color: var(--text-light);
            font-size: 14px;
            font-weight: 600;
            cursor: pointer;
            white-space: nowrap;
            transition: 0.2s;
            border: 2px solid transparent;
            flex: 1; text-align: center; /* دکمه‌های بزرگتر */
        }
        .filter-chip:hover { background: #e2e8f0; }
        .filter-chip.active {
            background: var(--accent-indigo);
            color: white;
            box-shadow: 0 4px 10px rgba(99, 102, 241, 0.3);
        }

        /* --- Bed Grid --- */
        .bed-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(450px, 1fr));
            gap: 25px;
        }

        .bed-card {
            background: white;
            border-radius: 16px;
            box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
            border: 1px solid var(--border-color);
            overflow: hidden;
            transition: 0.3s;
            animation: fadeIn 0.4s ease-out;
        }
        .bed-card:hover { transform: translateY(-3px); box-shadow: 0 10px 20px rgba(0,0,0,0.08); border-color: var(--accent-indigo); }

        .card-header {
            padding: 20px;
            border-bottom: 1px solid #f1f5f9;
            display: flex;
            justify-content: space-between;
            align-items: flex-start;
            gap: 10px;
        }

        .card-title { font-weight: 700; color: var(--text-main); font-size: 15px; line-height: 1.6; }
        .card-code { 
            font-weight: 800; color: var(--accent-indigo); font-size: 14px; 
            background: #e0e7ff; padding: 5px 10px; border-radius: 8px; 
            white-space: nowrap; flex-shrink: 0;
        }

        /* Price Table */
        .price-table-wrapper { padding: 15px; }
        .price-table {
            width: 100%;
            border-collapse: separate;
            border-spacing: 0;
            border-radius: 12px;
            overflow: hidden;
            border: 1px solid #cbd5e1;
        }
        .price-table th {
            background-color: var(--table-header-bg);
            color: #312e81;
            font-weight: 700;
            padding: 10px;
            font-size: 13px;
            text-align: center;
        }
        .price-table td {
            text-align: center;
            padding: 12px;
            font-size: 14px;
            border-right: 1px solid #e2e8f0;
            background: white;
            font-family: 'Segoe UI', sans-serif;
            font-weight: 600;
        }
        .price-table td:last-child { border-right: none; }
        .empty-price { color: #94a3b8; font-weight: normal; font-family: sans-serif; }

        /* --- Responsive --- */
        @media (max-width: 768px) {
            body { display: block; overflow: auto; }
            .mobile-menu-btn { display: flex; }
            .sidebar { position: fixed; top: 0; right: 0; height: 100vh; width: 280px; transform: translateX(100%); box-shadow: -5px 0 20px rgba(0,0,0,0.1); z-index: 1003; }
            .sidebar.active { transform: translateX(0); }
            .main-content { padding: 80px 20px 20px 20px; height: auto; overflow: visible; }
            .bed-grid { grid-template-columns: 1fr; }
            .page-title { font-size: 20px; }
        }
        @keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }