.bmi-container {
    background: #fff;
    border-radius: 24px;
    box-shadow: 0 8px 32px 0 rgba(60,60,60,0.08);
    padding: 32px 32px 24px 32px;
    max-width: 400px;
    margin: 40px auto;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    display: flex;
    flex-direction: column;
    gap: 18px;
    align-items: center;
}
.bmi-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: #222;
    margin-bottom: 8px;
    text-align: center;
}
.bmi-label {
    font-size: 1rem;
    color: #555;
    margin-bottom: 4px;
}
.bmi-input {
    width: 100%;
    padding: 12px 14px;
    border: 1.5px solid #e0e0e5;
    border-radius: 12px;
    font-size: 1.1rem;
    background: #f6f6fa;
    outline: none;
    transition: border 0.2s;
}
.bmi-input:focus {
    border: 1.5px solid #007aff;
    background: #fff;
}
.bmi-btn {
    width: 100%;
    padding: 13px 0;
    background: linear-gradient(90deg, #007aff 60%, #4f8cff 100%);
    color: #fff;
    font-size: 1.1rem;
    font-weight: 600;
    border: none;
    border-radius: 14px;
    box-shadow: 0 2px 8px 0 rgba(0,122,255,0.08);
    cursor: pointer;
    transition: background 0.2s;
}
.bmi-btn:active {
    background: #005ecb;
}
.bmi-result {
    margin-top: 10px;
    font-size: 1.15rem;
    color: #222;
    text-align: center;
    min-height: 28px;
}
.bmi-error {
    color: #ff3b30;
    font-size: 0.98rem;
    text-align: center;
    margin-top: 2px;
    min-height: 22px;
}