* {
    box-sizing: border-box;
}

html {
    color-scheme: light;
}

body {
    margin: 0;
    padding: 20px;
    font-family: Arial, sans-serif;
    line-height: 1.6;
    color: #222;
    background-color: #f4f4f4;
}

img {
    max-width: 100%;
}

.page-shell {
    max-width: 800px;
    margin: 0 auto;
    padding: 0;
}

.page-nav {
    display: flex;
    justify-content: flex-end;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
    font-size: 0.95rem;
}

.nav-group {
    display: flex;
    align-items: center;
    gap: 10px;
}

.nav-link {
    display: inline-block;
    padding: 5px 12px;
    border: 1px solid #c9cfd8;
    border-radius: 999px;
    background: #ffffff;
    color: #444;
    text-decoration: none;
    box-shadow: 0 1px 0 rgba(0, 0, 0, 0.03);
    transition: background-color 120ms ease, border-color 120ms ease, color 120ms ease;
}

.nav-link:hover,
.nav-link:focus-visible {
    background: #eef3fb;
    border-color: #b7c6df;
    color: #204f9a;
}

.nav-link.active {
    background: #e7eefb;
    border-color: #b7c6df;
    color: #204f9a;
    font-weight: 600;
}

.hero {
    margin-bottom: 20px;
}

.eyebrow {
    display: none;
}

.hero h1 {
    margin: 0 0 12px 0;
    font-size: 2rem;
    line-height: 1.2;
    color: #333;
}

.hero p {
    margin: 0;
}

.dek {
    max-width: none;
    color: #222;
    font-size: 1rem;
}

.meta {
    margin-top: 10px;
    color: #555;
    font-size: 0.95rem;
}

.page-shell h1,
.page-shell h2 {
    color: #333;
}

.post-body,
.card-grid {
    display: block;
}

.post-body .section-card + .section-card {
    margin-top: 42px;
}

.section-card {
    padding: 0;
}

.section-card h2,
.section-card h3 {
    margin: 0 0 10px 0;
    line-height: 1.2;
    color: #333;
}

.section-card p {
    margin: 0 0 14px;
}

.section-card p:last-child,
.section-card ul:last-child {
    margin-bottom: 0;
}

.figure-card {
    margin: 18px 0;
    padding: 0;
    border: 0;
    border-radius: 0;
    background: none;
}

.figure-card img {
    display: block;
    margin: 0 auto 10px;
    height: auto;
}

.figure-card figcaption {
    color: #555;
    font-size: 0.95rem;
    text-align: center;
}

.link-row {
    margin-top: 10px;
}

.link-pill {
    color: #0000ee;
}

.list-clean {
    margin: 0;
    padding-left: 20px;
}

.list-clean li + li {
    margin-top: 8px;
}

.katex-display {
    overflow-x: auto;
    overflow-y: hidden;
    padding: 0.3rem 0;
}

@media (max-width: 640px) {
    .page-nav {
        justify-content: flex-end;
    }
}