.health-tool { max-width: 760px; margin: 24px auto; }

.tool-box {
    border: 1px solid #e5e7eb;
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 2px 8px rgba(0,0,0,.05);
}

.tool-box h2, .tool-box h3 { margin: 0 0 15px; }

.tool-box label { display: block; margin: 12px 0 5px; font-weight: 600; }

.tool-box input, .tool-box select {
    width: 100%;
    padding: 12px;
    border: 1px solid #d1d5db;
    border-radius: 8px;
    box-sizing: border-box;
}

.tool-box button {
    width: 100%;
    margin-top: 15px;
    padding: 12px;
    background: #0a493b;
    color: #fff;
    border: 0;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    transition: opacity .2s;
}

.tool-box button:hover { opacity: .9; }

.result {
    margin-top: 15px;
    padding: 15px;
    border-radius: 8px;
    border: 1px solid #e5e7eb;
}