/* lp-a.org: the reference desk. Paper, ink, navy, one amber accent (the Lp(a) marker).
   Charis SIL (Charter DNA) for display and running text; Clear Sans for navigation, labels,
   tables and metadata. The apo(a) kringle chain (a row of shrinking rings) is the only motif.
   Light palette on :root, dark redefined by tokens only. No JS. */

@font-face{font-family:"Charis";src:url("fonts/charis-regular.woff2") format("woff2");font-weight:400;font-style:normal;font-display:swap}
@font-face{font-family:"Charis";src:url("fonts/charis-italic.woff2") format("woff2");font-weight:400;font-style:italic;font-display:swap}
@font-face{font-family:"Charis";src:url("fonts/charis-bold.woff2") format("woff2");font-weight:700;font-style:normal;font-display:swap}
@font-face{font-family:"ClearSans";src:url("fonts/clearsans-regular.woff2") format("woff2");font-weight:400;font-display:swap}
@font-face{font-family:"ClearSans";src:url("fonts/clearsans-medium.woff2") format("woff2");font-weight:500;font-display:swap}
@font-face{font-family:"ClearSans";src:url("fonts/clearsans-bold.woff2") format("woff2");font-weight:700;font-display:swap}

:root{
  --paper:#f4f4f1; --paper-2:#ebebe6; --paper-3:#e2e2dc;
  --ink:#1b1f24; --ink-2:#4a5058; --ink-3:#737a84;
  --rule:#d9dad4; --rule-2:#c6c8c0;
  --navy:#1e3d5c; --navy-2:#2f5f8f; --navy-soft:#dfe7ef;
  --amber:#b8741c; --amber-2:#9a5f12; --amber-soft:#f1e2c6;
  --serif:"Charis",Charter,"Bitstream Charter","Source Serif Pro",Georgia,serif;
  --sans:"ClearSans","Clear Sans","Helvetica Neue",Arial,sans-serif;
  --mono:ui-monospace,"SF Mono",Menlo,Consolas,monospace;
  --wrap:1180px; --measure:72ch;
  --shadow:0 1px 0 var(--rule);
}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    --paper:#10141a; --paper-2:#171c24; --paper-3:#1f2630;
    --ink:#e6e4dc; --ink-2:#b9bcb3; --ink-3:#8b9099;
    --rule:#2a3140; --rule-2:#3a4354;
    --navy:#8fb4d8; --navy-2:#b1cbe6; --navy-soft:#1c2a3a;
    --amber:#dda04a; --amber-2:#e8b364; --amber-soft:#3a2c14;
  }
}
:root[data-theme="dark"]{
  --paper:#10141a; --paper-2:#171c24; --paper-3:#1f2630;
  --ink:#e6e4dc; --ink-2:#b9bcb3; --ink-3:#8b9099;
  --rule:#2a3140; --rule-2:#3a4354;
  --navy:#8fb4d8; --navy-2:#b1cbe6; --navy-soft:#1c2a3a;
  --amber:#dda04a; --amber-2:#e8b364; --amber-soft:#3a2c14;
}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;font-size:17px}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--serif);line-height:1.55;font-feature-settings:"kern","liga"}
img,svg,video,iframe{max-width:100%}
a{color:var(--navy);text-decoration:none;text-underline-offset:.15em}
a:hover{color:var(--navy-2);text-decoration:underline}
a:focus-visible,summary:focus-visible{outline:2px solid var(--amber);outline-offset:2px;border-radius:2px}
h1,h2,h3,h4{font-family:var(--serif);font-weight:700;line-height:1.15;margin:0;text-wrap:balance;letter-spacing:-.005em}
h1{font-size:clamp(1.7rem,1.2rem + 2vw,2.6rem)}
h2{font-size:1.35rem}
h3{font-size:1.1rem}
p{margin:0}
ol,ul{margin:0;padding:0;list-style:none}
b,strong{font-weight:700}
small{font-size:.85em}
time{font-family:var(--sans);font-variant-numeric:tabular-nums}
.ico{width:.9em;height:.9em;vertical-align:-.1em;margin-right:.25em}
.mono{font-family:var(--mono);font-size:.85em}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 24px}
main.wrap{padding-top:28px;padding-bottom:56px}

/* ── masthead ─────────────────────────────────────────────────────────── */
.masthead{border-bottom:1px solid var(--rule);background:var(--paper)}
.masthead-row{display:flex;align-items:center;gap:20px 28px;flex-wrap:wrap;padding-top:14px;padding-bottom:12px}
.wordmark{order:1}
.wordmark{display:inline-flex;align-items:baseline;gap:14px;color:var(--ink);text-decoration:none}
.wordmark:hover{text-decoration:none;color:var(--ink)}
.wm-name{font-family:var(--serif);font-weight:700;font-size:1.75rem;letter-spacing:-.01em;line-height:1}
.wm-tld{color:var(--navy);font-weight:400}
.kringle{display:inline-block;width:78px;height:14px;align-self:center;
  background:
    radial-gradient(circle at 7px 7px,transparent 4.2px,var(--amber) 4.8px,var(--amber) 6.6px,transparent 7.2px),
    radial-gradient(circle at 26px 7px,transparent 3px,var(--amber) 3.6px,var(--amber) 5.2px,transparent 5.8px),
    radial-gradient(circle at 41px 7px,transparent 2px,var(--amber) 2.6px,var(--amber) 4px,transparent 4.6px),
    radial-gradient(circle at 53px 7px,transparent 1.2px,var(--amber) 1.7px,var(--amber) 3px,transparent 3.6px),
    radial-gradient(circle at 62px 7px,transparent .6px,var(--amber) 1px,var(--amber) 2.2px,transparent 2.8px);
  background-repeat:no-repeat}
.mast-right{display:flex;align-items:center;gap:14px;order:3}
.tt{display:inline-flex;border:1px solid var(--rule-2);border-radius:3px;overflow:hidden}
.tt button{appearance:none;background:transparent;border:0;border-right:1px solid var(--rule-2);color:var(--ink-3);width:30px;height:26px;display:grid;place-items:center;cursor:pointer;padding:0}
.tt button:last-child{border-right:0}
.tt button svg{width:15px;height:15px;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round}
.tt button[aria-pressed="true"]{background:var(--paper-3);color:var(--amber-2)}
.tt button:hover{color:var(--ink)}
.burger{display:none;appearance:none;background:transparent;border:1px solid var(--rule-2);border-radius:3px;color:var(--ink-2);width:34px;height:28px;place-items:center;cursor:pointer;padding:0}
.burger svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round}
.nav{display:flex;flex-wrap:wrap;gap:4px 18px;font-family:var(--sans);font-size:.86rem;font-weight:500;letter-spacing:.02em;order:2;margin-left:auto}
.nav a{color:var(--ink-2);padding:4px 0;border-bottom:2px solid transparent}
.nav a:hover{color:var(--ink);text-decoration:none;border-color:var(--rule-2)}
.nav a[aria-current="page"]{color:var(--ink);border-color:var(--amber)}
@media (max-width:900px){
  .burger{display:grid}
  .masthead-row{gap:12px 16px}
  .wm-name{font-size:1.45rem}
  .mast-right{gap:10px;margin-left:auto}
  .nav{display:none;order:4;flex-basis:100%;flex-direction:column;gap:0;border-top:1px solid var(--rule);padding-top:6px}
  .nav.open{display:flex}
  .nav a{padding:10px 0;border-bottom:1px solid var(--rule);font-size:1rem}
  .nav a[aria-current="page"]{border-bottom-color:var(--rule);color:var(--amber-2)}
}

/* ── lede / headings ──────────────────────────────────────────────────── */
.lede{padding:14px 0 30px;border-bottom:1px solid var(--rule);margin-bottom:34px}
.lede h1{max-width:34ch;font-size:clamp(1.7rem,1.05rem + 2.2vw,2.55rem)}
.lede-sub{margin-top:14px;max-width:var(--measure);color:var(--ink-2);font-size:1.02rem}
main.wrap>h1{margin-bottom:8px}
main.wrap>h1+.lede-sub{margin-top:8px;margin-bottom:26px}
.h-note{font-family:var(--sans);font-weight:400;font-size:.8em;color:var(--ink-3);letter-spacing:.01em}
.h-sec{font-family:var(--sans);font-size:.8rem;font-weight:700;letter-spacing:.09em;text-transform:uppercase;color:var(--ink-2);margin:0 0 14px;padding-bottom:8px;border-bottom:1px solid var(--rule);display:flex;justify-content:space-between;align-items:baseline;gap:12px}
.h-sec a{color:inherit}
.h-sec a:hover{color:var(--navy);text-decoration:none}
.h-sec.sub{margin-top:26px}
.h-sec .h-note{text-transform:none;letter-spacing:0;font-weight:400}
.sec{margin:38px 0}
.more{margin-top:14px;font-family:var(--sans);font-size:.88rem}
.jump{display:flex;flex-wrap:wrap;gap:6px 14px;font-family:var(--sans);font-size:.85rem;margin:0 0 30px}
.jump a{color:var(--ink-2);border-bottom:1px dotted var(--rule-2)}

/* ── grids ────────────────────────────────────────────────────────────── */
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:34px 44px}
.grid-2>*,.grid-3>*,.grid-4>*{min-width:0}
.grid-2.top{margin-bottom:10px}
.grid-2.tight{gap:18px 20px}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:26px 26px}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:22px 22px}
.grid-2.cards{gap:22px 28px;margin-top:22px}
@media (max-width:980px){.grid-4{grid-template-columns:1fr 1fr}.grid-3{grid-template-columns:1fr 1fr}}
@media (max-width:700px){.grid-2,.grid-3,.grid-4{grid-template-columns:1fr}html{font-size:16px}}

/* ── cards and rows ───────────────────────────────────────────────────── */
.card{border-top:2px solid var(--rule-2);padding-top:12px;display:flex;flex-direction:column;gap:6px}
.card.wide{border-top-color:var(--navy)}
.card h3 a{color:var(--ink)}
.card h3 a:hover{color:var(--navy-2)}
.card-kick{display:flex;gap:8px;flex-wrap:wrap}
.kicker{font-family:var(--sans);font-size:.72rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--navy)}
.kicker.land{color:var(--amber-2)}
.card-meta,.row-meta,.detail-meta{font-family:var(--sans);font-size:.82rem;color:var(--ink-3);display:flex;flex-wrap:wrap;gap:4px 8px;align-items:center}
.card-sum{color:var(--ink-2);font-size:.95rem;line-height:1.5}
.rows{border-top:1px solid var(--rule)}
.row{padding:10px 0;border-bottom:1px solid var(--rule);display:flex;flex-direction:column;gap:3px}
.row>a{color:var(--ink);font-size:1rem;line-height:1.35}
.row>a:hover{color:var(--navy-2)}
.row .kicker{margin-right:6px}
.status{font-family:var(--sans);font-size:.88rem;color:var(--ink-2)}
.status b{color:var(--ink);font-weight:700;margin-right:6px}

/* significance meter: ten cells, filled in amber */
.sig{display:inline-flex;align-items:center;gap:2px;margin-left:4px;vertical-align:middle}
.sig i{display:inline-block;width:6px;height:9px;background:var(--paper-3);border-radius:1px}
.sig i.on{background:var(--amber)}
.sig b{font-family:var(--sans);font-size:.72rem;color:var(--ink-3);margin-left:5px;font-weight:500}

/* topic chips */
.chips,.topics{display:inline-flex;flex-wrap:wrap;gap:6px}
.chip{font-family:var(--sans);font-size:.76rem;color:var(--ink-2);background:var(--paper-2);border:1px solid var(--rule);padding:3px 9px;border-radius:2px;line-height:1.3}
.chip:hover{border-color:var(--navy);color:var(--navy);text-decoration:none}
.chip b{color:var(--ink-3);font-weight:500;margin-left:3px}
.topics{margin-top:22px}

/* ── panels on the home ───────────────────────────────────────────────── */
.panel{background:var(--paper-2);padding:20px 22px 18px;border:1px solid var(--rule)}
.next li{display:grid;grid-template-columns:110px 1fr;gap:12px;padding:9px 0;border-bottom:1px solid var(--rule);align-items:start}
.next li:last-child{border-bottom:0}
.next time{color:var(--amber-2);font-weight:700;font-size:.86rem;padding-top:2px}
.next span{display:block;font-size:1rem;line-height:1.35}
.next small{display:block;font-family:var(--sans);color:var(--ink-3);font-size:.78rem;margin-top:2px}
.next.done time{color:var(--ink-3);font-weight:500}

/* ── tracker table ────────────────────────────────────────────────────── */
.tablewrap{overflow-x:auto;-webkit-overflow-scrolling:touch}
table.tracker{width:100%;border-collapse:collapse;font-family:var(--sans);font-size:.88rem;font-variant-numeric:tabular-nums}
.tracker th,.tracker td{text-align:left;vertical-align:top;padding:9px 12px 9px 0;border-bottom:1px solid var(--rule)}
.tracker thead th{font-size:.72rem;letter-spacing:.08em;text-transform:uppercase;color:var(--ink-3);font-weight:700;border-bottom:1px solid var(--rule-2)}
.tracker tbody th{font-family:var(--serif);font-weight:700;font-size:1rem}
.tracker tbody th a{color:var(--ink)}
.tracker tbody th a:hover{color:var(--navy-2)}
.tracker .num{text-align:right;padding-right:18px}
.tracker td{color:var(--ink-2)}
.panel .tracker td:nth-child(5),.panel .tracker th:nth-child(5){display:none}

/* ── video tiles ──────────────────────────────────────────────────────── */
.vtile{display:flex;flex-direction:column;gap:8px}
.vthumb{position:relative;display:block;aspect-ratio:16/9;background:var(--paper-3);overflow:hidden;border:1px solid var(--rule)}
.vthumb img{width:100%;height:100%;object-fit:cover;display:block}
.dur{position:absolute;right:8px;bottom:8px;font-family:var(--sans);font-size:.74rem;font-weight:500;color:#fff;background:rgba(16,20,26,.78);padding:3px 7px;border-radius:2px;display:inline-flex;align-items:center;font-variant-numeric:tabular-nums}
.vtile h3{font-size:1rem;line-height:1.3}
.vtile h3 a{color:var(--ink)}
.vtile h3 a:hover{color:var(--navy-2)}
.embed{position:relative;aspect-ratio:16/9;background:#000;margin:18px 0 22px;border:1px solid var(--rule)}
.embed iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.detail.media .embed{max-width:100%}

/* ── detail pages ─────────────────────────────────────────────────────── */
.crumbs{font-family:var(--sans);font-size:.8rem;color:var(--ink-3);margin-bottom:22px;display:flex;flex-wrap:wrap;gap:4px 6px}
.crumbs a{color:var(--ink-3)}
.crumbs .sep{color:var(--rule-2)}
.detail{max-width:var(--measure);display:flex;flex-direction:column;gap:14px}
.detail h1{margin-top:2px;font-size:clamp(1.5rem,1.1rem + 1.6vw,2.2rem)}
.detail .orig{font-family:var(--sans);font-size:.85rem;color:var(--ink-3)}
.authors{font-family:var(--sans);font-size:.85rem;color:var(--ink-2);line-height:1.5}
.prose{font-size:1.02rem;line-height:1.6;max-width:var(--measure)}
.prose p,.prose ul,.prose ol{margin:0 0 1em}
.prose ul{list-style:disc;padding-left:1.3em}
.prose ol{list-style:decimal;padding-left:1.4em}
.prose li{margin:.25em 0}
.prose h2{font-size:1.25rem;margin:1.6em 0 .5em}
.prose h3{font-size:1.05rem;margin:1.3em 0 .4em}
.prose.lead{font-size:1.14rem;line-height:1.55;color:var(--ink)}
.prose.lead p:last-child{margin-bottom:0}
.prose table{border-collapse:collapse;font-family:var(--sans);font-size:.9rem;width:100%;margin:0 0 1em}
.prose th,.prose td{border-bottom:1px solid var(--rule);text-align:left;padding:6px 10px 6px 0;vertical-align:top}
.btns{display:flex;flex-wrap:wrap;gap:10px;margin:6px 0 4px}
.btn{font-family:var(--sans);font-size:.86rem;font-weight:500;padding:8px 14px;border:1px solid var(--navy);color:var(--paper);background:var(--navy);border-radius:2px;display:inline-flex;align-items:center;gap:6px}
.btn:hover{background:var(--navy-2);border-color:var(--navy-2);color:var(--paper);text-decoration:none}
.btn.ghost{background:transparent;color:var(--navy)}
.btn.ghost:hover{background:var(--navy-soft);color:var(--navy)}
.btn .ico{margin:0 0 0 2px}
details.abstract,details.morelist,.faq details{border-top:1px solid var(--rule);border-bottom:1px solid var(--rule);padding:10px 0;margin:8px 0}
details summary{cursor:pointer;font-family:var(--sans);font-weight:500;font-size:.9rem;color:var(--navy);list-style:none;display:flex;align-items:center;gap:8px}
details summary::-webkit-details-marker{display:none}
details summary::before{content:"";width:7px;height:7px;border-right:1.5px solid currentColor;border-bottom:1.5px solid currentColor;transform:rotate(-45deg);transition:transform .15s;flex:none}
details[open] summary::before{transform:rotate(45deg)}
details .prose{margin-top:12px;font-size:.98rem}
.related{margin-top:48px;padding-top:8px;max-width:var(--measure)}
.f-small{font-family:var(--sans);font-size:.78rem;color:var(--ink-3);line-height:1.5}
.faq details summary{font-family:var(--serif);font-size:1.02rem;font-weight:700;color:var(--ink)}
.faq details .prose{font-size:.98rem}
.faq-page .faq-item{border-top:1px solid var(--rule);padding:18px 0 4px}
.faq-page .faq-item h2{margin:0 0 .5em}
.libsec{margin:34px 0 8px}
.libsec h2{margin-bottom:6px}
.sec-desc{color:var(--ink-2);margin-bottom:10px;font-size:.96rem}
.detail.page .prose.lead{color:var(--ink-2)}

/* ── timeline ─────────────────────────────────────────────────────────── */
.tl{position:relative;margin:6px 0 34px;padding-left:0}
.tl-year{margin:26px 0 8px}
.tl-year span{font-family:var(--sans);font-size:.74rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--amber-2)}
.tl-item{display:grid;grid-template-columns:130px 1fr;gap:16px;padding:12px 0;border-top:1px solid var(--rule)}
.tl-item time{color:var(--ink-2);font-weight:500;font-size:.88rem;padding-top:3px}
.tl-item h3{font-size:1.06rem;margin-bottom:4px}
.tl-item p{color:var(--ink-2);font-size:.96rem;margin-bottom:6px}
.tl-item .status{color:var(--amber-2);margin-bottom:6px}
.tl-link{font-family:var(--sans);font-size:.82rem;color:var(--ink-3);margin-left:6px;white-space:nowrap}
.tl.past .tl-item time{color:var(--ink-3)}
@media (max-width:480px){.kringle{display:none}}
@media (max-width:600px){.tl-item{grid-template-columns:1fr;gap:4px}.next li{grid-template-columns:90px 1fr}}

/* ── footer ───────────────────────────────────────────────────────────── */
.footer{border-top:1px solid var(--rule);background:var(--paper-2);margin-top:20px;font-family:var(--sans);font-size:.86rem;color:var(--ink-2)}
.footer-grid{display:grid;grid-template-columns:1fr 1fr;gap:26px 48px;padding-top:34px;padding-bottom:40px}
.footer p{margin-bottom:10px;line-height:1.55}
.f-name{font-family:var(--serif);font-weight:700;font-size:1.05rem;color:var(--ink)}
.footer a{color:var(--navy)}
@media (max-width:700px){.footer-grid{grid-template-columns:1fr}}

@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}
@media print{.masthead,.footer,.related,.btns{display:none}body{background:#fff;color:#000}}