styles.css

:root {
    --primary-color: #4CAF50;
    --secondary-color: #8BC34A;
    --background-color: #F1F8E9;
    --text-color: #333333;
    --accent-color: #FF9800;
}

body {
    font-family: 'Open Sans', sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: var(--background-color);
    margin: 0;
    padding: 0;
}

header {
    background-color: #4CAF50;
    color: white;
    padding: 1rem 0;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.header-logo {
    width: 50px;
    height: 50px;
    margin-right: 15px;
}

header h1 {
    font-size: 2rem;
    margin: 0;
    color: white;
}

@media (max-width: 600px) {
    .header-content {
        flex-direction: column;
    }

    .header-logo {
        margin-right: 0;
        margin-bottom: 10px;
    }

    header h1 {
        font-size: 1.5rem;
    }
}

main {
    max-width: 800px;
    margin: 2rem auto;
    padding: 0 1rem;
}

h1, h2, h3, h4, h5, h6 {
    font-family: 'Montserrat', sans-serif;
    font-weight: 600;
}

#calculator {
    background-color: white;
    border-radius: 8px;
    padding: 2rem;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    margin-bottom: 2rem;
}

form {
    display: flex;
    flex-direction: column;
}

label {
    margin-bottom: 0.5rem;
    color: var(--secondary-color);
}

input, select {
    margin-bottom: 1rem;
    padding: 0.5rem;
    border: 1px solid var(--secondary-color);
    border-radius: 4px;
}

button {
    background-color: var(--primary-color);
    color: white;
    padding: 0.75rem;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.3s ease;
    font-family: 'Montserrat', sans-serif;
    font-weight: 600;
    text-transform: uppercase;
}

button:hover {
    background-color: var(--secondary-color);
}

#results {
    background-color: white;
    border-radius: 8px;
    padding: 2rem;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

#bmiGauge {
    margin: 2rem auto;
}

#bmi-result {
    font-size: 1.2rem;
    font-weight: bold;
    color: var(--primary-color);
    text-align: center;
    margin-bottom: 1rem;
}

#calorie-advice, #lifestyle-advice {
    margin-bottom: 1rem;
    padding: 1rem;
    background-color: var(--background-color);
    border-radius: 4px;
}

#diet-recommendations, #workout-plan {
    margin-top: 2rem;
}

ul {
    list-style-type: none;
    padding-left: 0;
}

li {
    margin-bottom: 0.5rem;
    padding-left: 1.5rem;
    position: relative;
}

li::before {
    content: '•';
    color: var(--accent-color);
    position: absolute;
    left: 0;
}

footer {
    text-align: center;
    padding: 1rem 0;
    background-color: var(--primary-color);
    color: white;
    margin-top: 2rem;
}

.tips-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-around;
    gap: 20px;
}

.tip-card {
    background-color: #ffffff;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    padding: 20px;
    width: calc(33.33% - 20px);
    min-width: 250px;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    transition: transform 0.3s ease;
}

.tip-card:hover {
    transform: translateY(-5px);
}

.tip-icon {
    width: 64px;
    height: 64px;
    margin-bottom: 15px;
}

.tip-card h3 {
    font-family: 'Montserrat', sans-serif;
    font-weight: 600;
    color: #4CAF50;
    margin-bottom: 10px;
}

.tip-card p {
    font-family: 'Open Sans', sans-serif;
    font-size: 0.9rem;
    color: #666;
}

@media (max-width: 768px) {
    .tip-card {
        width: calc(50% - 20px);
    }
}

@media (max-width: 480px) {
    .tip-card {
        width: 100%;
    }
}

.highlight {
    font-family: 'Caveat', cursive;
    font-size: 1.2em;
    color: #4CAF50;
}

.social-links {
    margin-top: 15px;
}

.social-links a {
    color: white;
    font-size: 24px;
    margin: 0 10px;
    transition: color 0.3s ease;
}

.social-links a:hover {
    color: #FFEB3B;
}

/* Màu cụ thể cho từng icon khi hover */
.social-links a:hover .fa-facebook {
    color: #1877F2;
}

.social-links a:hover .fa-github {
    color: #211F1F;
}

.social-links a:hover .fa-telegram {
    color: #0088cc;
}