body {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    font-family: 'Poppins', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
}

main {
    flex: 1;
}

.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: #000;
    color: #fff;
    padding: 8px;
    text-decoration: none;
    z-index: 100;
    font-weight: bold;
}

.skip-link:focus,
.skip-link:focus-visible {
    top: 0;
    outline: 3px solid #ffd700;
    outline-offset: 2px;
}


.adulto-body {
    background-color: #ffffff9b;
}

.adulto-header {
    background-color: #173189;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.adulto-header .container {
    display: flex;
    align-items: center;
    padding-left: 0;
    padding-right: 0;
    max-width: 100%;
}

.adulto-header h1 {
    font-size: 1.5rem;
    font-weight: 600;
    flex: 1;
    padding-left: 1rem;
    padding-right: 1rem;
}

.adulto-header .btn {
    font-size: 0.9rem;
    padding: 0.5rem 1rem;
    z-index: 10;
    position: absolute;
    left: 1.25rem;
    top: 50%;
    transform: translateY(-50%);
}

@media (max-width: 768px) {
    .adulto-header h1 {
        font-size: 1.1rem;
    }
    
    .adulto-header .btn {
        font-size: 0.8rem;
        padding: 0.4rem 0.8rem;
    }
    
    .adulto-header h1 i {
        font-size: 0.9rem;
    }
}

.adulto-card {
    border-radius: 20px;
    overflow: hidden;
    animation: fadeInUp 0.6s ease;
}

.adulto-title {
    color: #173189;
    font-weight: bold;
}

.adulto-info {
    background: linear-gradient(135deg, #e3f2fd 0%, #90caf9 100%);
    border-left: 4px solid #173189;
    padding: 1.5rem;
    border-radius: 10px;
}

.btn-adulto {
    background: linear-gradient(150deg, #4169e1 0%, #173189 100%);
    border: none;
    color: white;
    font-weight: 600;
    transition: all 0.3s ease;
}

.btn-adulto:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(65, 105, 225, 0.4);
    color: white;
}

.btn-adulto:focus {
    outline: none;
    color: white;
}

.btn-adulto:focus-visible {
    outline: 3px solid #ffd700;
    outline-offset: 3px;
    box-shadow: 0 0 0 0.25rem rgba(65, 105, 225, 0.5);
    color: white;
}


.form-floating {
    position: relative;
    margin-bottom: 1rem;
}

.form-floating > .form-control {
    height: calc(3.5rem + 2px);
    padding: 1rem 0.75rem;
    border: 2px solid #dee2e6;
    border-radius: 0.5rem;
    font-size: 1rem;
    transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
}

.form-floating > .form-control:focus {
    border-color: #4169e1;
    outline: 0;
}

.form-floating > .form-control:focus-visible {
    border-color: #4169e1;
    outline: 0;
    box-shadow: 0 0 0 0.25rem rgba(65, 105, 225, 0.25);
}

.form-floating > label {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    padding: 1rem 0.75rem;
    pointer-events: none;
    border: 2px solid transparent;
    transform-origin: 0 0;
    transition: opacity 0.1s ease-in-out, transform 0.1s ease-in-out;
    color: #6c757d;
}

.form-floating > .form-control:focus ~ label,
.form-floating > .form-control:not(:placeholder-shown) ~ label {
    opacity: 0.65;
    transform: scale(0.85) translateY(-0.5rem) translateX(0.15rem);
}

.form-text {
    display: block;
    margin-top: 0.25rem;
    font-size: 0.875rem;
    color: #6c757d;
}


.was-validated .form-control:valid,
.form-control.is-valid {
    border-color: #198754;
}

.was-validated .form-control:valid:focus,
.form-control.is-valid:focus {
    border-color: #198754;
    box-shadow: 0 0 0 0.25rem rgba(25, 135, 84, 0.25);
}

.was-validated .form-control:invalid,
.form-control.is-invalid {
    border-color: #dc3545;
}

.was-validated .form-control:invalid:focus,
.form-control.is-invalid:focus {
    border-color: #dc3545;
    box-shadow: 0 0 0 0.25rem rgba(220, 53, 69, 0.25);
}

.invalid-feedback {
    display: none;
    width: 100%;
    margin-top: 0.25rem;
    font-size: 0.875rem;
    color: #dc3545;
}

.was-validated .form-control:invalid ~ .invalid-feedback,
.form-control.is-invalid ~ .invalid-feedback {
    display: block;
}

.valid-feedback {
    display: none;
    width: 100%;
    margin-top: 0.25rem;
    font-size: 0.875rem;
    color: #198754;
}

.was-validated .form-control:valid ~ .valid-feedback,
.form-control.is-valid ~ .valid-feedback {
    display: block;
}



#resultado {
    animation: slideIn 0.5s ease;
}

.resultado-card {
    border-radius: 15px;
    border: none;
    overflow: hidden;
}

.resultado-header {
    padding: 1.5rem;
    text-align: center;
    color: white;
    font-weight: bold;
}

.resultado-body {
    padding: 2rem;
}

.imc-valor {
    font-size: 3rem;
    font-weight: bold;
    text-align: center;
    margin: 1rem 0;
}

.imc-classificacao {
    font-size: 1.5rem;
    text-align: center;
    font-weight: 600;
    margin-bottom: 1rem;
}

.resultado-baixo-peso {
    background: linear-gradient(135deg, #64b5f6 0%, #42a5f5 100%);
}

.resultado-peso-normal {
    background: linear-gradient(135deg, #81c784 0%, #66bb6a 100%);
}

.resultado-sobrepeso {
    background: linear-gradient(135deg, #ffb74d 0%, #ffa726 100%);
}

.resultado-obesidade {
    background: linear-gradient(135deg, #e57373 0%, #ef5350 100%);
}

.text-baixo-peso {
    color: #1976d2;
}

.text-peso-normal {
    color: #388e3c;
}

.text-sobrepeso {
    color: #f57c00;
}

.text-obesidade {
    color: #d32f2f;
}



@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}



@media (max-width: 768px) {
    .adulto-header h1 {
        font-size: 1.5rem;
    }

    .card-body {
        padding: 1.5rem !important;
    }

    .form-floating > .form-control {
        font-size: 0.9rem;
    }

    .imc-valor {
        font-size: 2rem;
    }

    .imc-classificacao {
        font-size: 1.2rem;
    }

    .btn-lg {
        padding: 0.75rem 1.5rem;
        font-size: 1rem;
    }
}

@media (max-width: 576px) {
    .adulto-header .btn {
        padding: 0.5rem 1rem;
        font-size: 0.875rem;
    }

    .info-box {
        padding: 1rem !important;
    }

    .d-md-flex {
        flex-direction: column;
    }

    .d-md-flex .btn {
        width: 100%;
    }
}

@media (max-width: 576px) {
    .adulto-header h1 i.bi-calculator-fill {
        display: none;
    }
}


button:focus-visible,
input:focus-visible,
.btn:focus-visible {
    outline: 3px solid #4169e1;
    outline-offset: 3px;
}

.btn-adulto.loading {
    position: relative;
    pointer-events: none;
    opacity: 0.7;
}

.btn-adulto.loading::after {
    content: "";
    position: absolute;
    width: 16px;
    height: 16px;
    top: 50%;
    left: 50%;
    margin-left: -8px;
    margin-top: -8px;
    border: 2px solid #ffffff;
    border-radius: 50%;
    border-top-color: transparent;
    animation: spinner 0.6s linear infinite;
}

@keyframes spinner {
    to {
        transform: rotate(360deg);
    }
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    margin: -1px;
    padding: 0;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

@media (max-width: 576px) {
    .adulto-header h1 {
        padding-left: 3.75rem;
    }

    .adulto-header .btn {
        left: 0.75rem;
    }
}

.btn-voltar-fixo {
    position: fixed;
    top: 20px;
    left: 20px;
    background: rgba(255, 255, 255, 0.95);
    color: #1a2980;
    padding: 0.75rem 1.5rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.15);
    transition: all 0.3s ease;
    z-index: 1000;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 2px solid rgba(26, 41, 128, 0.1);
}

.btn-voltar-fixo:hover {
    transform: translateX(-5px);
    box-shadow: 0 6px 20px rgba(26, 41, 128, 0.3);
}

.btn-voltar-fixo:focus-visible {
    outline: 3px solid #ffd700;
    outline-offset: 2px;
}

.btn-voltar-fixo i {
    font-size: 1.2rem;
    transition: transform 0.3s ease;
}

.btn-voltar-fixo:hover i {
    transform: translateX(-3px);
}

@media (max-width: 768px) {
    .btn-voltar-fixo {
        padding: 0.6rem 1.2rem;
        font-size: 0.9rem;
        top: 15px;
        left: 15px;
    }
    .btn-voltar-fixo span { display: none; }
    .btn-voltar-fixo { width: 45px; height: 45px; padding: 0; justify-content: center; }
}