:root {
    --ink: #202122;
    --muted: #54595d;
    --link: #3366cc;
    --link-visited: #795cb2;
    --rule: #a2a9b1;
    --rule-soft: #c8ccd1;
    --panel: #f8f9fa;
    --page: #ffffff;
    --chrome: #f6f6f6;
    --serif: "Linux Libertine", "Georgia", "Times", serif;
    --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    background: var(--chrome);
    color: var(--ink);
    font: 15px/1.6 var(--sans);
}

a { color: var(--link); text-decoration: none; }
a:visited { color: var(--link-visited); }
a:hover { text-decoration: underline; }

.page { display: flex; min-height: 100vh; }

.sidebar { width: 11rem; flex-shrink: 0; padding: 1rem 0.75rem; font-size: 0.85rem; }
.sidebar h2 { margin: 1.25rem 0 0.25rem; font-size: 0.75rem; font-weight: normal; color: var(--muted); border-bottom: 1px solid var(--rule-soft); }
.sidebar ul { list-style: none; margin: 0; padding: 0; }
.sidebar li { padding: 0.2rem 0; }

.logo { display: block; text-align: center; color: var(--ink) !important; }
.logo:hover { text-decoration: none; }
.logo-mark {
    display: block; width: 4.5rem; height: 4.5rem; margin: 0 auto 0.4rem;
    border-radius: 50%; border: 1px solid var(--rule);
    background: radial-gradient(circle at 35% 30%, #ffffff, #e9e3c9 70%);
    font: 2.4rem/4.5rem var(--serif);
}
.logo-word { display: block; font: 1.35rem var(--serif); letter-spacing: 0.04em; }
.logo-tag { display: block; font-size: 0.7rem; color: var(--muted); }

.content-wrap { flex: 1; min-width: 0; padding-top: 2.5rem; }

.tabs { display: flex; justify-content: space-between; padding-right: 1.5rem; font-size: 0.82rem; }
.tabs-left, .tabs-right { display: flex; gap: 2px; align-items: flex-end; }
.tab { padding: 0.45rem 0.75rem; background: linear-gradient(#fff 0%, #f0f2f5 100%); border: 1px solid var(--rule-soft); border-bottom: none; color: var(--link); }
.tab.current { background: var(--page); color: var(--ink); position: relative; top: 1px; }

.content { background: var(--page); border: 1px solid var(--rule); border-right: none; padding: 1.25rem 1.75rem 2rem; }
.content::after { content: ""; display: table; clear: both; }

.first-heading { margin: 0; font: normal 1.9rem/1.3 var(--serif); border-bottom: 1px solid var(--rule); }
.site-sub { margin: 0.3rem 0 1.2rem; font-size: 0.8rem; color: var(--muted); }

h2 { margin: 1.6rem 0 0.5rem; font: normal 1.45rem/1.3 var(--serif); border-bottom: 1px solid var(--rule); }

.muted { color: var(--muted); font-size: 0.88em; }
.lead { margin-top: 0; }

.infobox { float: right; clear: right; width: 20rem; margin: 0 0 1rem 1.25rem; border: 1px solid var(--rule); background: var(--panel); border-collapse: collapse; font-size: 0.85rem; }
.infobox caption { padding: 0.4rem; font: bold 1rem var(--serif); }
.infobox th, .infobox td { padding: 0.3rem 0.5rem; text-align: left; vertical-align: top; border-top: 1px solid var(--rule-soft); }
.infobox th { width: 40%; }

.toc { display: inline-block; margin: 0.5rem 0 1rem; padding: 0.5rem 1rem; border: 1px solid var(--rule); background: var(--panel); font-size: 0.88rem; }
.toc ol { margin: 0.3rem 0 0; padding-left: 1.4rem; }

.line { margin: 0.75rem 0; padding: 0.5rem 1rem; border-left: 3px solid var(--rule-soft); }
.line-host { border-left-color: #b8a46a; }
.line p { margin: 0 0 0.3rem; font-family: var(--serif); font-size: 1.02rem; }
.line cite { font-style: normal; font-size: 0.82rem; color: var(--muted); }

.history { padding-left: 1.2rem; }
.history li { margin: 0.25rem 0; }

.columns { columns: 3 14rem; padding-left: 1.2rem; }

.mainpage-banner { padding: 1rem 1.25rem; margin-bottom: 1rem; border: 1px solid var(--rule); background: var(--panel); text-align: center; }
.mainpage-banner p { margin: 0.2rem 0; font: 1.15rem var(--serif); }
.mainpage-banner .count { font: 0.9rem var(--sans); color: var(--muted); }
.mainpage-cols { display: grid; grid-template-columns: repeat(auto-fit, minmax(18rem, 1fr)); gap: 1rem; }
.box { border: 1px solid var(--rule); padding: 0 1rem 0.75rem; }
.box h2 { margin-top: 0.75rem; font-size: 1.15rem; }
.more { text-align: right; font-size: 0.85rem; margin: 0; }

.footer { padding: 1rem 1.75rem; font-size: 0.78rem; color: var(--muted); }
.footer p { margin: 0.2rem 0; }

@media (max-width: 720px) {
    .page { flex-direction: column; }
    .sidebar { width: auto; display: flex; gap: 1rem; align-items: center; }
    .sidebar nav ul { display: flex; flex-wrap: wrap; gap: 0.75rem; }
    .sidebar h2 { display: none; }
    .logo-mark { width: 2.5rem; height: 2.5rem; font-size: 1.3rem; line-height: 2.5rem; margin: 0; }
    .logo-tag { display: none; }
    .content-wrap { padding-top: 0.5rem; }
    .content { border-right: 1px solid var(--rule); }
    .infobox { float: none; width: 100%; margin: 0 0 1rem; }
}

.answered { color: #14866d; }
.answer-box { clear: left; margin: 0 0 1rem; padding: 0 1rem 0.5rem; border: 1px solid #a3d3c6; background: #eef8f5; }
.answer-box h2 { margin-top: 0.6rem; font-size: 1.2rem; border-bottom-color: #a3d3c6; }