.calculator-wrapper  {
            max-width: 850px;
            margin: 0px auto 50px;
            position: relative;
        }

        .calculator-card {
           /* background: #fff;*/
            border: none;
           /* border-radius: 20px;*/
           /* box-shadow: 0 15px 45px rgba(0, 0, 0, 0.10);*/
            overflow: hidden;
        }

        .calculator-body {
      padding: 20px;
        }

        .section-title {
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 20px;
        }

        .form-label {
            font-weight: 600;
        }

        .form-control,
        .form-select {
            min-height: 48px;
            border-radius: 10px;
        }

        .preset-buttons {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-bottom: 25px;
        }

        .preset-buttons button {
            border-radius: 8px;
        }

        .calculate-btn {
            min-height: 52px;
            border-radius: 11px;
            font-weight: 700;
            font-size: 17px;
        }

        .result-card {
            display: none;
            margin-top: 30px;
            padding: 30px;
            text-align: center;
            border-radius: 18px;
            background: #eef5ff;
            border: 2px solid #0d6efd;
        }

        .result-card.show {
            display: block;
        }

        .dpi-number {
            font-size: clamp(45px, 9vw, 72px);
            line-height: 1;
            font-weight: 800;
            color: #0d6efd;
            margin: 15px 0 5px;
        }

        .dpi-unit {
            font-size: 18px;
            color: #6c757d;
        }

        .result-details {
            margin-top: 25px;
        }

        .detail-box {
            background: white;
            border-radius: 12px;
            padding: 15px;
            height: 100%;
        }

        .detail-value {
            display: block;
            font-size: 20px;
            font-weight: 700;
        }

        .detail-label {
            color: #6c757d;
            font-size: 13px;
        }

        .content-section {
            max-width: 850px;
            margin: 0 auto 60px;
            padding: 0 20px;
        }

        .content-section h2 {
            font-weight: 750;
            margin-top: 40px;
            margin-bottom: 15px;
        }

        .content-section h3 {
            font-weight: 700;
            margin-top: 30px;
        }

        .formula {
            background: #212529;
            color: white;
            padding: 20px;
            border-radius: 12px;
            overflow-x: auto;
            font-family: monospace;
            text-align: center;
            font-size: 16px;
        }

        .tip-box {
            border-left: 4px solid #0d6efd;
            background: #eef5ff;
            padding: 18px;
            border-radius: 8px;
            margin: 20px 0;
        }

     

        @media (max-width: 576px) {
            .calculator-body {
                padding: 22px;
            }

            .hero {
                padding: 45px 15px 80px;
            }
        }