/* General Page Styling */
* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: Arial, Helvetica, sans-serif;
    font-size: 1rem;
    line-height: 1.7;
    color: #263238;
    background-color: #f4f7fa;
    margin: 0;
    padding: 0;
}

/* Header */
header {
    background-color: #243b53;
    color: #ffffff;
    padding: 2rem 1rem;
    text-align: center;
}

h1 {
    font-size: 2.2rem;
    font-weight: 700;
    text-transform: capitalize;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.25);
    margin: 0 0 1rem;
}

h2 {
    color: #246b78;
    font-size: 1.5rem;
    font-weight: 700;
    margin-top: 1.5rem;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.15);
}

h3 {
    color: #246b78;
    font-size: 1.2rem;
}

p {
    margin: 0.8rem 0 1rem;
    text-align: left;
}

/* Navigation */
nav {
    background-color: #172b3a;
    padding: 0.8rem;
    border-radius: 0.4rem;
}

nav a {
    display: inline-block;
    color: #ffffff;
    text-decoration: none;
    font-weight: 600;
    padding: 0.5rem 1rem;
    margin: 0.2rem;
    border-radius: 0.3rem;
    transition: background-color 0.2s ease;
}

nav a:hover,
nav a:focus-visible {
    background-color: #d8eef0;
    color: #172b3a;
}

nav a[aria-current="page"] {
    background-color: #ffffff;
    color: #243b53;
}

/* Main Content and Box Model */
main {
    width: 90%;
    max-width: 60rem;
    margin: 2rem auto;
    padding: 1.5rem;
    background-color: #ffffff;
    border: 1px solid #dce4e9;
    border-radius: 0.6rem;
}

article,
section {
    margin-bottom: 1.5rem;
    padding: 1rem;
    border-bottom: 1px solid #dce4e9;
}

#intro {
    background-color: #eaf4f5;
    padding: 1rem;
    border-left: 0.3rem solid #246b78;
}

.highlight {
    color: #246b78;
    font-weight: 700;
    background-color: #eaf4f5;
    padding: 0.8rem;
    border-radius: 0.3rem;
}

blockquote {
    margin: 1rem 0;
    padding: 1rem;
    background-color: #f0f5f7;
    border-left: 0.3rem solid #246b78;
    font-style: italic;
}

/* Links */
a {
    color: #176b87;
}

a:hover,
a:focus-visible {
    text-decoration: underline;
}

.back-to-top {
    text-align: center;
    margin: 2rem 0;
}

.back-to-top a {
    display: inline-block;
    padding: 0.6rem 1rem;
    color: #ffffff;
    background-color: #243b53;
    border-radius: 0.3rem;
    text-decoration: none;
}

.back-to-top a:hover {
    background-color: #246b78;
}

/* Lists */
ul,
ol {
    padding-left: 2rem;
    list-style-position: outside;
}

ul {
    list-style-type: square;
}

ol {
    list-style-type: decimal;
}

li {
    margin-bottom: 0.4rem;
}

dl {
    margin: 1rem 0;
}

dt {
    font-weight: 700;
    color: #246b78;
}

dd {
    margin-bottom: 0.7rem;
}

/* Project Cards and Images */
.project-card {
    margin-bottom: 1.5rem;
    padding: 1rem;
    border: 1px solid #dce4e9;
    border-radius: 0.5rem;
}

figure {
    margin: 1.5rem 0;
    text-align: center;
}

figure img {
    display: block;
    width: 100%;
    max-width: 18rem;
    height: auto;
    margin: 0 auto;
    border: 1px solid #dce4e9;
    border-radius: 0.4rem;
}

figcaption {
    margin-top: 0.6rem;
    color: #526575;
    font-size: 0.9rem;
    font-style: italic;
    text-align: center;
}

time {
    color: #246b78;
    font-weight: 700;
}

/* Contact Form */
fieldset {
    border: 1px solid #b8c7d1;
    border-radius: 0.4rem;
    padding: 1rem;
}

legend {
    color: #246b78;
    font-weight: 700;
    padding: 0 0.4rem;
}

label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.3rem;
}

input,
textarea,
button {
    font: inherit;
    max-width: 100%;
}

input,
textarea {
    display: block;
    width: 100%;
    padding: 0.7rem;
    margin: 0.3rem 0 1rem;
    color: #263238;
    background-color: #ffffff;
    border: 1px solid #b8c7d1;
    border-radius: 0.3rem;
}

textarea {
    resize: vertical;
}

button {
    padding: 0.7rem 1.2rem;
    color: #ffffff;
    background-color: #246b78;
    border: none;
    border-radius: 0.3rem;
    cursor: pointer;
}

button:hover,
button:focus-visible {
    background-color: #172b3a;
}

/* Keyboard Accessibility */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
    outline: 3px solid #d58b27;
    outline-offset: 3px;
}

/* Footer */
footer {
    padding: 1.2rem;
    text-align: center;
    color: #ffffff;
    background-color: #243b53;
}

footer p {
    margin: 0;
    text-align: center;
    font-size: 0.9rem;
}

/* Responsive Design */
@media (max-width: 40rem) {
    header {
        padding: 1.5rem 0.8rem;
    }

    h1 {
        font-size: 1.7rem;
    }

    h2 {
        font-size: 1.25rem;
    }

    nav a {
        display: block;
        margin: 0.3rem 0;
    }

    main {
        width: 94%;
        padding: 1rem;
        margin: 1rem auto;
    }

    article,
    section {
        padding: 0.7rem;
    }

    fieldset {
        padding: 0.7rem;
    }
}