/* Background ONLY inside Pipe Thickness Tab */
#pipeThicknessTab {
    font-family: "Poppins", sans-serif;

    background: url('https://images.pexels.com/photos/2381463/pexels-photo-2381463.jpeg?auto=compress&cs=tinysrgb&w=1600')
                no-repeat center/cover;

    padding: 40px;
    min-height: 100vh;
}

/* Glass box ONLY inside this tab */
#pipeThicknessTab .box883 {
    width: 420px;
    padding: 25px;
    backdrop-filter: blur(12px);
    background: rgba(255, 255, 255, 0.25);
    border-radius: 18px;
    box-shadow: 0 8px 25px rgba(0,0,0,0.2);
    border: 1px solid rgba(255,255,255,0.4);
    margin-top: 20px;
}

/* Header text ONLY here */
#pipeThicknessTab h2 {
    color: white;
    text-shadow: 0 0 6px rgba(0,0,0,0.4);
}

/* Dropdowns ONLY inside this tab */
#pipeThicknessTab select {
    width: 100%;
    padding: 12px;
    margin-top: 12px;
    border-radius: 10px;
    border: none;
    background: rgba(255,255,255,0.6);
    font-size: 16px;
    outline: none;
}

/* Thickness result text ONLY inside this tab */
#pipeThicknessTab #result_thickness_883 {
    margin-top: 25px;
    font-size: 26px;
    font-weight: bold;
    color: #ffffff;
    text-align: center;
    opacity: 0.9;
}