:root {
    --background: #f4f4f4;
    --card: #ffffff;
    --text: #4c4d4e;
    --title: #50596c;
    --muted: #999999;
    --accent: #6200ee;
    --radius: 5px;
    --sans: Arial, Helvetica, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
    margin: 0;
    background: var(--background);
    color: var(--text);
    font-family: var(--sans);
    font-size: 16px;
    line-height: 1.8;
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: #3700b3; }

.topbar {
    align-items: center;
    background: var(--card);
    display: flex;
    justify-content: space-between;
    min-height: 60px;
    padding: 0 1.75rem;
}

.topbar-brand { border-radius: var(--radius); color: var(--title); font-size: 18px; padding: 16px 10px; }
.topbar-nav { display: flex; flex-wrap: wrap; }
.topbar-nav a, .page-link { border-radius: var(--radius); color: var(--title); padding: 16px 10px; }
.topbar-nav a:hover, .page-link:hover { background: #f4f4f4; color: var(--title); }

.cover { margin: 0 auto 1rem; text-align: center; }
.banner img { display: block; height: auto; max-height: 360px; object-fit: cover; width: 100%; }
.cover-panel { margin: 3rem auto 0; max-width: 776px; }
.cover-panel h1, .section-title, .article-header h1 { color: var(--title); }
.cover-panel h1 { font-size: clamp(2rem, 5vw, 2.8rem); margin: 0; }
.cover-intro { color: #999; margin: 1rem auto 0; max-width: 36rem; }

.card-main { margin: 0 auto; max-width: 776px; padding: 12px 16px 48px; }
.section-title { font-size: 1.4rem; margin: 18px 0; }
.card-list { display: grid; gap: 16px; }
.card-row { display: block; }
.card-index { display: none; }
.content-card {
    background: var(--card);
    border-radius: var(--radius);
    box-shadow: 0 1px 4px rgba(0, 0, 0, .08);
    padding: 18px 20px;
}
.card-row .content-card { flex: 1; }
.content-card h2 { font-size: 1.35rem; margin: 0 0 8px; }
.content-card h2 a { color: var(--title); }
.card-summary { margin: 0 0 12px; }
.card-meta { color: var(--muted); font-size: 0.8rem; margin: 0; }
.meta-separator { margin: 0 8px; }
.empty-state { color: var(--muted); }

.pagination { align-items: center; display: flex; justify-content: space-between; margin-top: 8px; }
.pagination span { color: var(--muted); font-size: 0.85rem; }

.term-grid { display: grid; gap: 12px; }
.term-card { align-items: center; color: var(--title); display: flex; justify-content: space-between; }
.term-card strong { color: var(--accent); }

.archive-year { margin-bottom: 14px; }
.archive-year-heading { align-items: baseline; display: flex; justify-content: space-between; }
.archive-year-heading h2 { color: var(--title); margin: 0; }
.archive-year-heading span, .archive-year time { color: var(--muted); font-size: 0.8rem; }
.archive-year ul { list-style: none; margin: 8px 0 0; padding: 0; }
.archive-year li { align-items: baseline; display: flex; gap: 12px; padding: 6px 0; }
.archive-year time { flex: 0 0 105px; }
.archive-year a { color: var(--title); }

.article-header h1 { font-size: clamp(1.8rem, 4vw, 2.4rem); line-height: 1.25; margin: 6px 0 8px; }
.article-toc { background: #f4f4f4; border-radius: var(--radius); margin: 12px 0 18px; padding: 12px 14px; }
.toc-title { color: var(--accent); font-size: 0.75rem; letter-spacing: 0.12em; margin: 0 0 6px; text-transform: uppercase; }
.article-content img, .article-content video { height: auto; max-width: 100%; }
.article-content pre { background: #eeeeee; overflow-x: auto; padding: 14px; }
.article-content code { background: #eeeeee; padding: 1px 4px; }
.article-content blockquote { border-left: 3px solid var(--accent); color: var(--muted); margin-left: 0; padding-left: 14px; }
.article-content table { display: block; overflow-x: auto; }
.article-footer { border-top: 1px solid rgba(0, 0, 0, .08); margin-top: 24px; padding-top: 12px; }
.taxonomy-row { display: flex; flex-wrap: wrap; gap: 8px; margin: 8px 0; }
.taxonomy-row > span { color: var(--muted); }
.taxonomy-row a { background: #f4f4f4; border-radius: var(--radius); padding: 2px 8px; }
.article-nav { display: flex; gap: 12px; justify-content: space-between; margin-top: 16px; }
.article-nav a { display: flex; flex: 1; flex-direction: column; }
.article-nav-next { align-items: flex-end; text-align: right; }
.article-nav span { color: var(--muted); font-size: 0.72rem; letter-spacing: 0.08em; text-transform: uppercase; }
.article-nav strong { color: var(--title); }

.site-footer { color: var(--muted); font-size: 0.8rem; margin: 0 auto 32px; max-width: 776px; padding: 0 16px; }
.footer-inner { align-items: center; display: flex; gap: 12px; justify-content: space-between; }
.footer-years { display: flex; flex-wrap: wrap; gap: 10px; }

@media (max-width: 650px) {
    .topbar, .footer-inner, .card-row, .article-nav { display: block; }
    .topbar-nav { margin-top: 8px; }
    .cover-banner { height: 160px; }
    .article-nav a { margin-bottom: 12px; }
    .article-nav-next { align-items: flex-start; text-align: left; }
}