:root { 
            --primary-bg: #f3f4f6; 
            --sidebar-bg: #ffffff; 
            --text-main: #1e293b; 
            --text-light: #64748b; 
            --accent-teal: #0ea5e9; 
            --card-border: #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 Button --- */
        .mobile-menu-btn { 
            display: none; 
            position: fixed; 
            top: 20px; 
            right: 20px; 
            z-index: 1001; /* دکمه زیر منو و اورلی باشد که وقتی منو باز شد مزاحم نشود */
            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-teal); 
            font-size: 20px; 
            cursor: pointer; 
            align-items: center; 
            justify-content: center; 
        }

        /* --- Overlay (لایه شیشه‌ای) --- */
        .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; /* بالاتر از دکمه، پایین‌تر از سایدبار */
        }
        .overlay.active { display: block; }

        /* --- Sidebar --- */
        .sidebar { 
            width: 260px; 
            background-color: var(--sidebar-bg); 
            border-left: 1px solid var(--card-border); 
            display: flex; 
            flex-direction: column; 
            padding: 20px; 
            z-index: 1000; /* در دسکتاپ پایین است */
            transition: transform var(--transition-speed); 
            flex-shrink: 0; 
            height: 100vh; 
        }

        .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-teal); color: white; transform: translateX(3px); }
        .page-title { font-size: 24px; font-weight: 800; color: var(--text-main); }
        .page-subtitle { color: var(--text-light); font-size: 14px; margin-top: 5px; }

        /* --- Tariffs Grid --- */
        .tariffs-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(400px, 1fr)); 
            gap: 25px;
        }

        .tariff-card {
            background: white;
            border-radius: 16px;
            padding: 25px;
            box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
            border: 1px solid var(--card-border);
            transition: 0.3s;
            animation: fadeIn 0.5s ease-out;
        }
        .tariff-card:hover { transform: translateY(-3px); box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1); border-color: var(--accent-teal); }

        .tariff-header {
            font-size: 18px;
            font-weight: 800;
            margin-bottom: 20px;
            padding-bottom: 15px;
            border-bottom: 2px solid #f1f5f9;
            color: var(--text-main);
            display: flex;
            align-items: center;
            gap: 10px;
        }
        
        .tariff-header i { color: var(--accent-teal); background: #e0f2fe; padding: 8px; border-radius: 8px; font-size: 16px; }

        /* --- Table --- */
        table { width: 100%; border-collapse: separate; border-spacing: 0; }
        tr { transition: 0.2s; }
        tr:hover { background-color: #f8fafc; }

        td {
            padding: 15px 10px;
            border-bottom: 1px solid #f1f5f9;
            font-size: 14px;
            color: var(--text-main);
        }
        tr:last-child td { border-bottom: none; }

        td.title-col { font-weight: 500; }
        td.price-col { 
            text-align: left; 
            font-weight: 700;
            color: var(--text-main);
            font-family: 'Segoe UI', sans-serif; 
            letter-spacing: 0.5px;
            white-space: nowrap; 
        }

        .price-badge {
            background-color: #f1f5f9;
            padding: 6px 12px;
            border-radius: 8px;
            color: #334155;
            display: inline-block;
        }

        /* --- Responsive Logic --- */
        @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); 
                /* نکته مهم: در موبایل z-index باید خیلی بالا باشد تا روی اورلی بیفتد */
                z-index: 1003; 
            }
            .sidebar.active { transform: translateX(0); }
            
            .main-content { padding: 80px 20px 20px 20px; height: auto; overflow: visible; }
            .tariffs-grid { grid-template-columns: 1fr; }
            .page-title { font-size: 20px; }
        }
        @keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }