:root {
            --primary-color: #2c353e;
            --primary-hover: #0044cc;
            --bg-color: #f5f5f7;
            --card-bg: #ffffff;
            --text-primary: #1a1a1a;
            --text-secondary: #6e6e73;
            --border-color: #d2d2d7;
            --success-color: #34c759;
            --danger-color: #ff3b30;
            --warning-color: #ff9500;
            --radius: 16px;
            --shadow: 0 4px 24px rgba(0, 0, 0, 0.06);
        }

        .container-calc  { max-width: 700px; margin: 0 auto; }

        .calculator-card, .info-section, .history-card {
            background: var(--card-bg);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            padding: 24px;
            margin-bottom: 24px;
        }

        /* Tabs */
        .tabs {
            display: flex;
            background: #f0f0f2;
            border-radius: 12px;
            padding: 4px;
            margin-bottom: 24px;
        }

        .tab-btn {
            flex: 1;
            padding: 12px;
            border: none;
            background: transparent;
            color: var(--text-secondary);
            font-size: 15px;
            font-weight: 600;
            cursor: pointer;
            border-radius: 10px;
            transition: all 0.2s ease;
        }

        .tab-btn.active {
            background: var(--card-bg);
            color: var(--text-primary);
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
        }

        /* Input Groups */
        .input-group { margin-bottom: 20px; }
        .input-group label {
            display: block;
            font-size: 14px;
            font-weight: 600;
            color: var(--text-secondary);
            margin-bottom: 8px;
        }

        .form-control {
            width: 100%;
            padding: 14px;
            font-size: 16px;
            font-weight: 500;
            border: 2px solid var(--border-color);
            border-radius: 10px;
            outline: none;
            transition: border-color 0.2s;
            font-family: inherit;
            background: #fff;
        }

        .form-control:focus { border-color: var(--primary-color); }

        .row { display: flex; gap: 16px; }
        .col { flex: 1; }

        .hidden { display: none !important; }

        /* NMCK Rows */
        .nmck-row {
            display: flex;
            gap: 12px;
            margin-bottom: 12px;
            align-items: center;
        }
        .nmck-row .form-control { margin-bottom: 0; }
        .btn-icon {
            width: 46px;
            height: 46px;
            border: none;
            background: #f0f0f2;
            border-radius: 10px;
            cursor: pointer;
            font-size: 18px;
            color: var(--text-secondary);
            display: flex;
            align-items: center;
            justify-content: center;
            transition: all 0.2s;
        }
        .btn-icon:hover { background: #e5e5ea; color: var(--danger-color); }

        .btn-add {
            width: 100%;
            padding: 12px;
            background: transparent;
            border: 2px dashed var(--border-color);
            color: var(--primary-color);
            font-size: 15px;
            font-weight: 600;
            border-radius: 10px;
            cursor: pointer;
            transition: all 0.2s;
            margin-top: 8px;
        }
        .btn-add:hover { border-color: var(--primary-color); background: rgba(0, 85, 255, 0.04); }

        /* Results */
        .results {
            border-top: 1px solid var(--border-color);
            padding-top: 24px;
            margin-top: 24px;
        }
        .results h3 { font-size: 18px; margin-bottom: 16px; font-weight: 600; }

        .result-item {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 14px 0;
            border-bottom: 1px solid #f0f0f2;
        }
        .result-item:last-of-type { border-bottom: none; }
        .result-label { font-size: 15px; color: var(--text-secondary); font-weight: 500; }
        .result-value { font-size: 18px; font-weight: 700; color: var(--text-primary); }

        /* NMCK Table */
        .nmck-table {
            width: 100%;
            border-collapse: collapse;
            margin-top: 16px;
            font-size: 14px;
        }
        .nmck-table th {
            text-align: left;
            padding: 10px;
            background: #f9f9fa;
            color: var(--text-secondary);
            font-weight: 600;
            border-bottom: 2px solid var(--border-color);
        }
        .nmck-table td {
            padding: 10px;
            border-bottom: 1px solid #f0f0f2;
        }
        .status-badge {
            display: inline-block;
            padding: 4px 8px;
            border-radius: 6px;
            font-size: 12px;
            font-weight: 600;
        }
        .status-used { background: rgba(52, 199, 89, 0.15); color: var(--success-color); }
        .status-excluded { background: rgba(255, 59, 48, 0.15); color: var(--danger-color); }

        /* Action Buttons */
        .actions { display: flex; gap: 12px; margin-top: 24px; }
        .btn-primary, .btn-secondary {
            flex: 1;
            padding: 14px;
            border-radius: 12px;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.2s;
            border: none;
            text-align: center;
        }
        .btn-primary { background: var(--primary-color); color: white; }
        .btn-primary:hover { background: var(--primary-hover); }
        .btn-secondary { background: transparent; border: 1px solid var(--border-color); color: var(--text-secondary); }
        .btn-secondary:hover { background: #f0f0f2; color: var(--text-primary); }

        /* History Section */
        .history-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 16px;
        }
        .history-header h2 { font-size: 20px; font-weight: 700; }
        .clear-history-btn {
            background: transparent;
            border: none;
            color: var(--danger-color);
            font-size: 14px;
            font-weight: 600;
            cursor: pointer;
            padding: 4px 8px;
            border-radius: 6px;
        }
        .clear-history-btn:hover { background: rgba(255, 59, 48, 0.1); }

        .saved-item {
            background: #f9f9fa;
            border-radius: 12px;
            padding: 16px;
            margin-bottom: 12px;
            border: 1px solid #e5e5ea;
        }
        .saved-item-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 8px;
        }
        .saved-item-date { font-size: 13px; color: var(--text-secondary); }
        .delete-btn {
            background: transparent;
            border: none;
            color: var(--text-secondary);
            font-size: 13px;
            cursor: pointer;
            padding: 4px 8px;
            border-radius: 6px;
        }
        .delete-btn:hover { background: rgba(255, 59, 48, 0.1); color: var(--danger-color); }
        .saved-item-body strong { font-size: 15px; color: var(--text-primary); display: block; margin-bottom: 4px; }
        .saved-item-details { display: flex; gap: 16px; font-size: 14px; color: var(--text-secondary); }
        .saved-item-details strong { color: var(--text-primary); font-size: 14px; }
        .empty-history { text-align: center; color: var(--text-secondary); padding: 24px; font-size: 15px; }

        .mode-badge {
            display: inline-block;
            padding: 2px 8px;
            border-radius: 4px;
            font-size: 12px;
            font-weight: 700;
            margin-right: 8px;
            text-transform: uppercase;
        }
        .badge-tf { background: rgba(0, 85, 255, 0.1); color: var(--primary-color); }
        .badge-nmck { background: rgba(255, 149, 0, 0.1); color: var(--warning-color); }

        .info-note {
            font-size: 13px;
            color: var(--text-secondary);
            margin-top: 6px;
            line-height: 1.4;
        }

        @media (max-width: 600px) {
            .row { flex-direction: column; gap: 12px; }
            .nmck-row { flex-wrap: wrap; }
            .nmck-row .form-control { flex: 1; }
            .actions { flex-direction: column; }
        }