:root {
    --dark-grey: #2e3440;
    --light-grey: #3b4252;
    --white: #eceff4;
    --accent: #d08700;
}

@font-face {
    font-family: BMR;
    src: url(/files/fonts/BerkeleyMono-Regular.woff2);
}
@font-face {
    font-family: BMO;
    src: url(/files/fonts/BerkeleyMono-Oblique.woff2);
}
@font-face {
    font-family: BMB;
    src: url(/files/fonts/BerkeleyMono-Bold.woff2);
}
@font-face {
    font-family: BMBO;
    src: url(/files/fonts/BerkeleyMono-Bold-Oblique.woff2);
}

/* Base typography and layout */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    line-height: 1.5;
}

body {
    font-family: BMR, monospace;
    color: var(--dark-grey);
    background-color: var(--white);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header and navigation */
header {
    border-bottom: 2px solid var(--dark-grey);
    background-color: var(--white);
}

nav {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

nav ul {
    list-style: none;
    display: flex;
    gap: 2rem;
    align-items: center;
}

nav ul:first-child {
    flex: 1;
}

nav ul:last-child {
    flex-shrink: 0;
}

nav li {
    margin: 0;
}

nav a {
    color: var(--dark-grey);
    text-decoration: none;
    text-transform: uppercase;
    font-family: BMB, monospace;
    letter-spacing: 0.05em;
    padding: 0.5rem 0;
    border-bottom: 2px solid transparent;
    transition: border-color 0.2s;
}

nav a:hover {
    border-bottom-color: var(--accent);
}

nav strong {
    font-family: BMB, monospace;
    font-size: 1.125rem;
    letter-spacing: 0.05em;
    color: var(--dark-grey);
}

header hr {
    border: none;
    height: 2px;
    background-color: var(--dark-grey);
    margin: 0;
}

/* Main content area */
main {
    flex: 1;
    max-width: 1200px;
    width: 100%;
    margin: 0 auto;
    padding: 3rem 2rem;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: BMB, monospace;
    font-weight: normal;
    margin-bottom: 1rem;
    letter-spacing: 0.02em;
    line-height: 1.2;
}

h1 {
    font-size: 2rem;
    margin-bottom: 2rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

h2 {
    font-size: 1.5rem;
    margin-top: 2rem;
    margin-bottom: 1rem;
}

p {
    margin-bottom: 1rem;
    line-height: 1.6;
}

a {
    color: var(--dark-grey);
    text-decoration: underline;
    text-decoration-color: var(--accent);
    text-underline-offset: 2px;
}

a:hover {
    color: var(--accent);
}

ul, ol {
    margin-left: 1.5rem;
    margin-bottom: 1rem;
}

li {
    margin-bottom: 0.5rem;
}

strong {
    font-family: BMB, monospace;
    font-weight: normal;
}

/* Grid system */
.smol-css-grid {
    --min: 30ch;
    --gap: 1rem;
  
    display: grid;
    grid-gap: var(--gap);
    /* min() with 100% prevents overflow
    in extra narrow spaces */
    grid-template-columns: repeat(auto-fit, minmax(min(100%, var(--min)), 1fr));
    align-items: stretch;
}

.smol-css-grid > div {
    display: flex;
    flex-direction: column;
}

/* Reverse/inverse styling */
.reverse {
    background-color: var(--dark-grey);
    color: var(--white);
    padding: 2rem;
    border: 2px solid var(--dark-grey);
}

.reverse a {
    color: var(--white);
    text-decoration-color: var(--accent);
}

.reverse a:hover {
    color: var(--accent);
}

/* Standout styling */
.standout {
    background-color: var(--accent);
    color: var(--dark-grey);
    padding: 2rem;
    border: 2px solid var(--accent);
}

.standout a {
    color: var(--dark-grey);
    text-decoration-color: var(--dark-grey);
}

.standout a:hover {
    color: var(--dark-grey);
    text-decoration-color: var(--white);
}

/* Figures and images */
figure {
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    height: 100%;
}

.smol-css-grid figure {
    flex: 1;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
    border: 2px solid var(--dark-grey);
}

.smol-css-grid img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
}

figcaption {
    font-family: BMO, monospace;
    font-size: 0.875rem;
    margin-top: 0.5rem;
    color: var(--light-grey);
    text-align: center;
}

center {
    display: block;
    text-align: center;
}

/* Footer */
footer {
    border-top: 2px solid var(--dark-grey);
    padding: 2rem;
    margin-top: 3rem;
}

footer p {
    max-width: 1200px;
    margin: 0 auto;
    font-size: 0.875rem;
    font-family: BMO, monospace;
    text-align: center;
}

footer.reverse {
    background-color: var(--dark-grey);
    color: var(--white);
    border-top-color: var(--dark-grey);
}

/* Responsive adjustments */
@media (max-width: 768px) {
    nav {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
        padding: 1rem;
    }

    nav ul {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
        width: 100%;
    }

    nav ul:first-child,
    nav ul:last-child {
        flex: none;
    }

    main {
        padding: 2rem 1rem;
    }

    h1 {
        font-size: 1.5rem;
    }

    .reverse {
        padding: 1.5rem;
    }

    .standout {
        padding: 1.5rem;
    }
}

@media (prefers-color-scheme: dark) {
    body {
        color: var(--white);
        background-color: var(--dark-grey);
    }

    header {
        background-color: var(--dark-grey);
        border-bottom-color: var(--white);
    }

    nav a,
    nav strong {
        color: var(--white);
    }

    header hr {
        background-color: var(--white);
    }

    a {
        color: var(--white);
    }

    img {
        border-color: var(--white);
    }

    figcaption {
        color: var(--light-grey);
    }

    footer {
        border-top-color: var(--white);
    }

    .reverse {
        background-color: var(--white);
        color: var(--dark-grey);
        border-color: var(--white);
    }

    .reverse a {
        color: var(--dark-grey);
        text-decoration-color: var(--accent);
    }

    .reverse a:hover {
        color: var(--accent);
    }

    footer.reverse {
        background-color: var(--white);
        color: var(--dark-grey);
        border-top-color: var(--white);
    }
}