/* ---------- REINER RECHNER (ohne Hero/CTA/Footer) ---------- */
        .rechner-section {
            padding: 3rem 0 4rem 0;
        }
        .rechner-section h2 {
            text-align: center;
            margin-bottom: 1rem;
            font-size: 2rem;
        }
        .rechner-section .subhead {
            text-align: center;
            color: #4b5563;
            margin-bottom: 2rem;
            font-size: 1.1rem;
        }

        /* Tabs */
        .calculator-tabs {
            display: flex;
            gap: 0.5rem;
            margin-bottom: 2rem;
            flex-wrap: wrap;
            border-bottom: 1px solid #e2e8f0;
            padding-bottom: 0;
        }
        .calculator-tab {
            padding: 0.75rem 1.5rem;
            background: #f1f5f9;
            border: none;
            border-radius: 8px 8px 0 0;
            font-size: 0.8rem;
            font-weight: 600;
            color: #475569;
            cursor: pointer;
            transition: all 0.2s ease;
            font-family: inherit;
        }
        .calculator-tab:hover {
            background: #e2e8f0;
            color: #1e293b;
        }
        .calculator-tab.active {
            background: var(--petrol);
            color: white;
            border-bottom: 2px solid var(--petrol);
        }

        /* Panels */
        .calculator-panel {
            display: none;
            background: white;
            border-radius: 16px;
            padding: 2rem;
            box-shadow: 0 4px 20px rgba(0,0,0,0.08);
            border: 1px solid #e2e8f0;
        }
        .calculator-panel.active {
            display: block;
        }
        .calculator-panel h3 {
            margin-bottom: 0.25rem;
            font-size: 1.4rem;
        }
        .calculator-panel .panel-desc {
            color: #4b5563;
            margin-bottom: 1.5rem;
        }

        /* Inputs */
        .input-group {
            margin-bottom: 1.5rem;
        }
        .input-group label {
            display: block;
            font-weight: 600;
            margin-bottom: 0.5rem;
            color: #1e293b;
        }
        .input-group input,
        .input-group select {
            width: 100%;
            padding: 0.75rem;
            border: 1px solid #cbd5e1;
            border-radius: 8px;
            font-size: 1rem;
            font-family: inherit;
            background: white;
        }
        .input-group input:focus,
        .input-group select:focus {
            outline: none;
            border-color: var(--petrol);
            box-shadow: 0 0 0 3px rgba(15,123,58,0.2);
        }
        .input-row {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1rem;
        }

        /* Buttons */
        .btn-calc {
            background: var(--petrol);
            color: white;
            padding: 0.75rem 1.5rem;
            border: none;
            border-radius: 8px;
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.2s ease;
            width: 100%;
            margin-top: 0.5rem;
        }
        .btn-calc:hover {
            background: var(--petrol);
        }

        /* Ergebnis-Box */
        .calculator-result {
            margin-top: 2rem;
            padding: 1.5rem;
            background: #f0fdf4;
            border-radius: 12px;
            border-left: 4px solid var(--petrol);
            text-align: center;
        }
        .result-number {
            font-size: 2.5rem;
            font-weight: 700;
            color: var(--petrol);
            margin: 0.5rem 0;
        }
        .result-sub {
            font-size: 0.9rem;
            color: #475569;
        }
        .result-message {
            margin-top: 1rem;
            font-weight: 500;
            color: #1e293b;
        }

        /* Erklärung */
        .explanation-text {
            margin-top: 1.5rem;
            padding-top: 1.5rem;
            border-top: 1px solid #e2e8f0;
            font-size: 0.9rem;
            line-height: 1.6;
            color: #475569;
        }
        .explanation-text strong {
            color: #1e293b;
        }

        /* Responsive */
        @media (max-width: 768px) {
            .calculator-tab {
                padding: 0.5rem 1rem;
                font-size: 0.85rem;
            }
            .calculator-panel {
                padding: 1.5rem;
            }
            .input-row {
                grid-template-columns: 1fr;
                gap: 0.5rem;
            }
            .result-number {
                font-size: 1.8rem;
            }
            .rechner-section h2 {
                font-size: 1.5rem;
            }
        }