body {
    background-color: #f8f9fa;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.card {
    border-radius: 15px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    margin-bottom: 20px;
}

.btn {
    border-radius: 8px;
}

.form-control, .form-select {
    border-radius: 8px;
    border: 1px solid #ced4da;
}

.form-control:focus, .form-select:focus {
    border-color: #80bdff;
    box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.25);
}

/* Form validation styles */
.form-control:invalid,
.form-select:invalid {
    border-color: #dc3545;
}

.form-control:invalid:focus,
.form-select:invalid:focus {
    border-color: #dc3545;
    box-shadow: 0 0 0 0.2rem rgba(220, 53, 69, 0.25);
}

.form-control:valid,
.form-select:valid {
    border-color: #198754;
}

.form-control:valid:focus,
.form-select:valid:focus {
    border-color: #198754;
    box-shadow: 0 0 0 0.2rem rgba(25, 135, 84, 0.25);
}

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

.form-control:invalid:not(:focus) ~ .invalid-feedback,
.form-select:invalid:not(:focus) ~ .invalid-feedback {
    display: block;
}

/* Accessibility improvements */
.form-control:focus,
.form-select:focus,
.btn:focus {
    outline: 2px solid #4a90e2;
    outline-offset: 2px;
}

/* Alert styles */
.alert {
    border-radius: 8px;
    margin-bottom: 1rem;
}

.alert-danger {
    background-color: #f8d7da;
    border-color: #f5c2c7;
    color: #842029;
}

.alert-dismissible .btn-close {
    padding: 1.25rem;
}

/* Improve contrast for better accessibility */
label {
    color: #212529;
    font-weight: 500;
}

.btn-primary {
    background-color: #0d6efd;
    border-color: #0d6efd;
}

.btn-primary:hover {
    background-color: #0b5ed7;
    border-color: #0a58ca;
}

/* Animation for validation feedback */
@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

.form-control:invalid:not(:focus),
.form-select:invalid:not(:focus) {
    animation: shake 0.3s ease-in-out;
}

/* Screen reader only text */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

#results {
    animation: fadeIn 0.5s ease-in;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.table td {
    padding: 12px;
}

#bmiGauge {
    max-width: 80%;
    height: 150px;
    margin: 20px auto;
}

/* Blog Featured Image */
.featured-image img {
    width: 800px;
    height: 500px;
    max-width: 100%;
    height: auto;
    display: block;
    margin: 0 auto;
}

/* BMI Result Colors */
.bmi-underweight {
    background-color: #ffeeba;
    border-color: #ffeeba;
    color: #856404;
}

.bmi-normal {
    background-color: #d4edda;
    border-color: #c3e6cb;
    color: #155724;
}

.bmi-overweight {
    background-color: #fff3cd;
    border-color: #ffeeba;
    color: #856404;
}

.bmi-obese {
    background-color: #f8d7da;
    border-color: #f5c6cb;
    color: #721c24;
}

.result-container {
    transition: all 0.3s ease-in-out;
    padding: 20px;
    border-radius: 8px;
    margin: 20px 0;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}