/* The Long Run — site styles. Light by default, dark when the system asks for it. */
:root {
  --bg: #faf8f4;
  --panel: #ffffff;
  --panel-2: #f2efe8;
  --border: #e3ded3;
  --text: #22251f;
  --muted: #6b6e66;
  --accent: #2f7d6d;
  --accent-ink: #ffffff;
  --link: #22685a;
  --warn-bg: #fff4dc;
  --warn-border: #e8c46a;
  --t-senescence: #b5543c;
  --t-clocks: #6a5bb0;
  --t-metabolism: #c08a1e;
  --t-cells: #2f7d6d;
  --t-immunity: #2e6fa8;
  --t-brain: #a8447a;
  --t-lifestyle: #4f8a2c;
  --max: 1120px;
  --serif: Georgia, "Iowan Old Style", "Palatino Linotype", Palatino, serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #161815;
    --panel: #1f221e;
    --panel-2: #262a25;
    --border: #343932;
    --text: #e7e8e3;
    --muted: #a0a49b;
    --accent: #5fb8a3;
    --accent-ink: #0f1a17;
    --link: #7fcfbb;
    --warn-bg: #3a3020;
    --warn-border: #8a6f2a;
    --t-senescence: #e08a73;
    --t-clocks: #a89be6;
    --t-metabolism: #e2b552;
    --t-cells: #5fb8a3;
    --t-immunity: #74aee0;
    --t-brain: #e083b4;
    --t-lifestyle: #8fc566;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--text); font: 17px/1.65 var(--sans); }
a { color: var(--link); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:hover { text-decoration-thickness: 2px; }
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 16px; }
.wrap.narrow { max-width: 760px; }

.site-header { border-bottom: 1px solid var(--border); background: var(--panel); }
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 60px; flex-wrap: wrap; }
.logo { display: flex; align-items: center; gap: 10px; font: 700 20px/1 var(--serif); color: var(--text); text-decoration: none; }
.site-nav { display: flex; gap: 4px; flex-wrap: wrap; }
.site-nav a { color: var(--muted); text-decoration: none; padding: 6px 10px; border-radius: 6px; font-size: 15px; }
.site-nav a:hover { color: var(--text); background: var(--panel-2); }
.site-nav a.active { color: var(--text); font-weight: 600; }

.masthead { padding: 44px 0 28px; }
.masthead h1 { font: 700 clamp(32px, 6vw, 48px)/1.1 var(--serif); margin: 0 0 12px; letter-spacing: -0.01em; }
.tagline { color: var(--muted); max-width: 640px; margin: 0; font-size: 18px; }

.home { display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 40px; padding-bottom: 48px; }
@media (max-width: 860px) { .home { grid-template-columns: 1fr; } }

.post-card { padding: 22px 0; border-bottom: 1px solid var(--border); }
.post-card:first-child { padding-top: 4px; }
.post-card h2 { font: 700 24px/1.25 var(--serif); margin: 8px 0 8px; }
.post-card h2 a { color: var(--text); text-decoration: none; }
.post-card h2 a:hover { color: var(--link); }
.post-card .lead { margin: 0; color: var(--text); }
.evidence-line { margin: 8px 0 0; font-size: 14px; color: var(--muted); }
.post-meta { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; font-size: 14px; color: var(--muted); }

.pill { display: inline-block; font-size: 12px; font-weight: 600; letter-spacing: .02em; padding: 2px 9px; border-radius: 999px;
        border: 1px solid currentColor; text-decoration: none; line-height: 1.6; }
.pill.preprint { color: var(--muted); border-style: dashed; }
.topic-senescence { color: var(--t-senescence); } .dot.topic-senescence { background: var(--t-senescence); }
.topic-clocks { color: var(--t-clocks); } .dot.topic-clocks { background: var(--t-clocks); }
.topic-metabolism { color: var(--t-metabolism); } .dot.topic-metabolism { background: var(--t-metabolism); }
.topic-cells { color: var(--t-cells); } .dot.topic-cells { background: var(--t-cells); }
.topic-immunity { color: var(--t-immunity); } .dot.topic-immunity { background: var(--t-immunity); }
.topic-brain { color: var(--t-brain); } .dot.topic-brain { background: var(--t-brain); }
.topic-lifestyle { color: var(--t-lifestyle); } .dot.topic-lifestyle { background: var(--t-lifestyle); }
.dot { display: inline-block; width: 10px; height: 10px; border-radius: 50%; margin-right: 8px; vertical-align: 1px; }

.sidebar h2 { font: 700 13px/1 var(--sans); text-transform: uppercase; letter-spacing: .08em; color: var(--muted); margin: 6px 0 12px; }
.topic-list { list-style: none; padding: 0; margin: 0 0 24px; }
.topic-list li { display: flex; justify-content: space-between; align-items: center; padding: 7px 0; border-bottom: 1px solid var(--border); }
.topic-list a { color: var(--text); text-decoration: none; }
.topic-list a:hover { color: var(--link); }
.count { color: var(--muted); font-size: 14px; font-weight: 400; }
.note { background: var(--panel-2); border-radius: 10px; padding: 16px 18px; font-size: 15px; }
.note h3 { margin: 0 0 6px; font-size: 15px; }
.note p { margin: 0; color: var(--muted); }

.post { padding: 36px 0 12px; }
.post-header h1 { font: 700 clamp(28px, 5vw, 38px)/1.2 var(--serif); margin: 12px 0 14px; letter-spacing: -0.01em; }
.post-header .lead { font-size: 19px; color: var(--muted); margin: 0 0 22px; }
.glance { background: var(--panel); border: 1px solid var(--border); border-left: 4px solid var(--accent); border-radius: 8px; padding: 14px 18px; margin: 0 0 26px; font-size: 15.5px; }
.glance p { margin: 4px 0 0; }
.glance-label { font-size: 12px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); }
.warn { background: var(--warn-bg); border: 1px solid var(--warn-border); border-radius: 6px; padding: 8px 12px; margin-top: 10px !important; }
.prose h2 { font: 700 23px/1.3 var(--serif); margin: 32px 0 8px; }
.prose h3 { font-size: 18px; margin: 26px 0 6px; }
.prose p, .prose li { overflow-wrap: break-word; }
.prose blockquote { margin: 18px 0; padding: 4px 18px; border-left: 3px solid var(--border); color: var(--muted); }
.prose code { background: var(--panel-2); padding: 1px 5px; border-radius: 4px; font-size: .9em; }
.table-wrap { overflow-x: auto; margin: 18px 0; }
table { border-collapse: collapse; width: 100%; font-size: 15px; }
th, td { text-align: left; padding: 7px 10px; border-bottom: 1px solid var(--border); vertical-align: top; }
th { font-weight: 600; background: var(--panel-2); }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; }
.sources { margin-top: 34px; padding-top: 18px; border-top: 1px solid var(--border); font-size: 15px; }
.sources h4 { margin: 0 0 6px; font-size: 13px; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); }
.sources ul { margin: 0; padding-left: 18px; }
.sources li { overflow-wrap: anywhere; }
.post-nav { display: flex; justify-content: space-between; gap: 20px; padding: 20px 0 50px; font-size: 15px; }
.post-nav a { max-width: 48%; }

.page-header { padding: 36px 0 12px; }
.page-header h1 { font: 700 34px/1.2 var(--serif); margin: 4px 0 10px; }
.page-header .lead { color: var(--muted); }
.kicker { font-size: 13px; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); }
.topic-block { padding: 16px 0; border-bottom: 1px solid var(--border); }
.topic-block h2 { font: 700 22px/1.3 var(--serif); margin: 0 0 4px; }
.topic-block h2 a { color: var(--text); text-decoration: none; }
.topic-block p { margin: 0 0 6px; color: var(--muted); }
.topic-block ul { margin: 0; padding-left: 20px; font-size: 15px; }
.month-block h2 { font: 700 20px/1.3 var(--serif); margin: 24px 0 8px; }
.archive { list-style: none; padding: 0; margin: 0; }
.archive li { padding: 8px 0; border-bottom: 1px solid var(--border); }
.arch-date { display: inline-block; min-width: 56px; color: var(--muted); font-size: 14px; font-variant-numeric: tabular-nums; }
.more { margin: 20px 0; }
.empty { color: var(--muted); }

footer { border-top: 1px solid var(--border); background: var(--panel); padding: 24px 0 36px; font-size: 14px; color: var(--muted); }
footer p { max-width: 760px; }

.habits-card { display: grid; gap: 4px; margin: 0 0 20px; padding: 16px 18px; border-radius: 10px; text-decoration: none;
               background: var(--panel); border: 1px solid var(--border); border-left: 4px solid var(--accent); color: var(--text); }
.habits-card strong { font: 700 18px/1.3 var(--serif); }
.habits-card span:last-child { color: var(--muted); font-size: 15px; }
.habits-card:hover strong { color: var(--link); }
.habits h2 { padding-top: 18px; border-top: 1px solid var(--border); }
.habits hr { border: 0; border-top: 2px solid var(--border); margin: 30px 0 0; }
.habits hr + h2 { border-top: 0; }