:root{
    --text-color: #2B2E2B;
    --link-color: #257325;
    --background-color: #E6FCE8;
    --header-color: #BDF0BD;
    --backtotop-color: #849C91;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Poppins' , sans-serif;
    background-color: var(--background-color);
}

a {
    color: var(--link-color);
    text-decoration: none;
}

/* Navigation Bar */
nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 50px; 
    height: 80px;

    position: sticky;
    top: 0;
    z-index: 1000;
    background-color: var(--header-color);
}

nav .left a {
    color:  var(--text-color);
    font-size: 22px;
    font-weight: 600;
}

nav .right {
    display: flex;
    gap: 15px;
}

nav .right a {
    color: var(--text-color);
}



nav .right a span {
    margin-left: 5px;
}



/* SECTION 1: Introduction */
.Introduction-section {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 50px;
    margin: 50px 0;
    margin-bottom: 100px;
    gap: 40px;
}

.Introduction-section .text {
    flex: 5;
}

.Introduction-section .text h2 {
    font-size: 45px;
}

.Introduction-section .text .links {
    margin-top: 25px;
}

.Introduction-section .text .links a {
    display: inline-block;
    padding: 5px 10px;
    border: 2px solid var(--link-color);
    border-radius: 5px;
    margin-right: 5px;
    margin-bottom: 10px;
    transition: .1s;
}

.Introduction-section .text .links a:hover {
    color: var(--text-color);
    border: 2px solid var(--text-color);
}

.Introduction-section .headshot {
    flex: 2;   
    display: flex;
    justify-content: right;
}

.Introduction-section .headshot img {
    width: 350px;
    border-radius: 50%;

}

/* SECTION 2: Skills */
.skills-section {
    padding: 0 50px;
    margin-bottom: 100px; 
}

#skills {
    scroll-margin-top: 100px;
}

.skills-section h2 {
    text-align: center;
    font-size: 35px;
}

.skills-section .text {
    text-align: center;
    margin-bottom: 20px;
}

.skills-section .cells {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
}

.skills-section .cells .cell {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;

    width: 200px;
    padding: 10px 20px;
    margin: 10px;
    border: 1.5px solid #609960;
    border-radius: 5px;
}

.skills-section .cells .cell img {
    width: 30px;
    height: 30px;
    object-fit: contain;
    border-radius: 2px;
}

.skills-section .cells .cell span {
    font-size: 18px;
}

/* SECTION 5: Contact */
.contact-section {
    padding: 0 50px;
    margin-bottom: 100px;
    text-align: center;
}

#contact {
    scroll-margin-top: 100px;
}

.contact-section h2 {
    font-size: 35px;
    margin-bottom: 10px;
}

.contact-text {
    margin-bottom: 30px;
}

.contact-form {
    max-width: 500px;
    margin: 0 auto;
}

.contact-form input,
.contact-form textarea {
    width: 100%;
    padding: 12px 15px;
    margin-bottom: 15px;
    border-radius: 5px;
    border: 1.5px solid #609960;
    font-family: inherit;
    font-size: 14px;
}

.contact-form textarea {
    resize: vertical;
}

.contact-form button {
    background-color: var(--text-color);
    color: var(--background-color);
    padding: 10px 25px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 14px;
    transition: opacity 0.2s ease;
}

.contact-form button:hover {
    opacity: 0.85;
}

/* SECTION 6: Footer */
.footer {
    background-color: #dff5e2;
    padding: 50px 50px 20px;
}

.footer-container {
    display: flex;
    justify-content: space-between;
    gap: 40px;
    margin-bottom: 30px;
}

.footer-col {
    flex: 1;
}

.footer-col h3,
.footer-col h4 {
    margin-bottom: 15px;
    color: var(--text-color);
}

.footer-col p {
    font-size: 14px;
    line-height: 1.6;
}

.footer-col a {
    display: block;
    margin-bottom: 8px;
    color: var(--link-color);
    font-size: 14px;
}

.footer-col a i {
    margin-right: 6px;
}

.footer-bottom {
    text-align: center;
    font-size: 13px;
    color: #555;
}

/* Back to top button */
.back-to-top {
    position: fixed;
    bottom: 25px;
    right: 25px;

    width: 45px;
    height: 45px;

    background-color: var(--backtotop-color);
    color: var(--background-color);

    display: flex;
    align-items: center;
    justify-content: center;

    border-radius: 50%;
    font-size: 18px;
    
    opacity: 0;
    pointer-events: none;

    transition: opacity 0.2s ease, transform 0.2s ease;
    z-index: 1000;
}

.back-to-top.show {
    opacity: 0.8;
    pointer-events: auto;
}

.back-to-top:hover {
    opacity: 1;
    transform: translateΥ(-3px);
}



@media (max-width: 850px) {
    /* SECTION 1: Introduction */
    .Introduction-section .text h2 {
        font-size: 35px;
    }
}

@media (max-width: 740px) {
    /* SECTION 1: Introduction */
    .Introduction-section {
        flex-direction: column-reverse;
    }

    .Introduction-section .headshot img{
        width: 300px;
    }
}

@media (max-width: 600px) {
    /* Navigation Bar*/
    nav {
        padding: 0 20px;
    }

    nav .right a {
        font-size: 22px;
    }

    nav .right a:last-child {
        color: var(--text-color);
        background-color: transparent;
        padding: 0;
    }

    nav .right a span {
        display: none;
    }

    /* SECTION 1: Introduction */
    .Introduction-section {
        padding: 0 20px;
    }

    .Introduction-section .text h2 {
        font-size: 30px;
    }
    
    /* SECTION 2: Skills */
    .skills-section {
        padding: 0 20px;
    }

    .skills-section .cells .cell span {
        font-size: 16px;
    }

    /* SECTION 6: Footer */
    .footer {
        padding: 40px 20px 20px;
    }

    .footer-container {
        flex-direction: column;
        align-items: center;
        text-align: center;
        gap: 30px;
    }

}