:root {
    --bg:          #f4f8fe;
    --surface:     #ffffff;
    --tint:        #e6f0fd;
    --line:        #d3e2f6;
    --text:        #1b2f4b;
    --muted:       #62768f;
    --primary:     #2b6fe0;
    --primary-dk:  #164aa8;
    --radius:      10px;
    --shadow:      0 1px 2px rgba(22, 74, 168, .06), 0 6px 20px rgba(22, 74, 168, .07);
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    scroll-padding-top: 1rem;
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: "Segoe UI", system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
    font-size: 1rem;
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;

    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

main,
#content,
body > h1,
body > h2,
body > h3,
body > p {
    max-width: 62rem;
    margin-left: auto;
    margin-right: auto;
    padding-left: 1.5rem;
    padding-right: 1.5rem;
}

#content,
main {
    margin-top: 2rem;
    margin-bottom: 2rem;
    padding-top: 1.5rem;
    padding-bottom: 1.5rem;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

body > h1 {
    margin-top: 2rem;
}

h1,
h2,
h3 {
    color: var(--primary-dk);
    line-height: 1.25;
    letter-spacing: -.01em;
}

h1 {
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    font-weight: 750;
    margin: 0 0 .4em;
}

h2 {
    font-size: clamp(1.3rem, 2.5vw, 1.7rem);
    font-weight: 650;
    margin: 1.4em 0 .5em;
    padding-bottom: .35em;
    border-bottom: 1px solid var(--line);
}

h3 {
    font-size: 1.15rem;
    font-weight: 650;
    margin: 1.4em 0 .5em;
}

p {
    margin: 0 0 1em;
}

a {
    color: var(--primary);
    text-decoration-thickness: 1px;
    text-underline-offset: 3px;
}

a:hover {
    color: var(--primary-dk);
}

a:focus-visible,
button:focus-visible,
input:focus-visible {
    outline: 3px solid rgba(43, 111, 224, .45);
    outline-offset: 2px;
    border-radius: 4px;
}

hr {
    border: 0;
    border-top: 1px solid var(--line);
    margin: 1.75rem 0;
}

code,
pre {
    font-family: ui-monospace, "Cascadia Code", Consolas, "SF Mono", monospace;
    font-size: .92em;
}

code {
    background: var(--tint);
    color: var(--primary-dk);
    padding: .1em .4em;
    border-radius: 5px;
}

pre {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 1rem;
    overflow: auto;
}

pre code {
    background: none;
    padding: 0;
}

@media (max-width: 40rem) {
    main,
    #content {
        margin: 1rem .75rem;
        padding-left: 1rem;
        padding-right: 1rem;
    }

    body > h1,
    body > h2,
    body > h3,
    body > p {
        padding-left: 1rem;
        padding-right: 1rem;
    }
}

@media (prefers-reduced-motion: reduce) {
    * {
        transition: none !important;
    }
}