/* davidsonchua.cc — single stylesheet
   Minimal, fast, no JS dependency. Dark mode via prefers-color-scheme. */

:root{
  --bg:#ffffff;
  --panel:#ffffff;
  --text:#101114;
  --muted:#5b6472;
  --faint:#8a919c;
  --hair:#e6e8ec;
  --hair2:#d7dbe1;
  --accent:#101114;
  --max:820px;
  --wide:1040px;
  --radius:14px;
}

@media (prefers-color-scheme: dark){
  :root{
    --bg:#0e1013;
    --panel:#14171c;
    --text:#f2f4f7;
    --muted:#a5adba;
    --faint:#7c8492;
    --hair:#232830;
    --hair2:#2e343d;
    --accent:#ffffff;
  }
}

*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}

body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,"Apple Color Emoji";
  font-size:16px;
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
}

img{max-width:100%;height:auto}

a{color:var(--text);text-decoration:underline;text-underline-offset:3px;text-decoration-thickness:1px;text-decoration-color:var(--hair2)}
a:hover{text-decoration-color:currentColor}

.shell{max-width:var(--max);margin:0 auto;padding:0 20px}
.shell.wide{max-width:var(--wide)}

.skip{position:absolute;left:-9999px;top:0;background:var(--text);color:var(--bg);padding:10px 16px;z-index:99}
.skip:focus{left:8px;top:8px}

:focus-visible{outline:2px solid var(--text);outline-offset:3px;border-radius:4px}

/* ---------- Header ---------- */
.siteHeader{
  position:sticky;top:0;z-index:20;
  background:color-mix(in srgb,var(--bg) 88%,transparent);
  backdrop-filter:saturate(160%) blur(10px);
  border-bottom:1px solid var(--hair);
}
.headerInner{display:flex;align-items:center;justify-content:space-between;gap:18px;min-height:58px;flex-wrap:wrap}
.brand{font-weight:750;letter-spacing:-.2px;text-decoration:none;font-size:15.5px}
.nav{display:flex;gap:16px;flex-wrap:wrap}
.nav a{font-size:14px;color:var(--muted);text-decoration:none}
.nav a:hover{color:var(--text)}
.nav a[aria-current="page"]{color:var(--text);font-weight:650}

/* ---------- Type ---------- */
h1{font-size:clamp(28px,5vw,40px);line-height:1.12;letter-spacing:-.7px;font-weight:760;margin:0 0 14px}
h2{font-size:clamp(20px,3vw,25px);line-height:1.22;letter-spacing:-.35px;font-weight:720;margin:44px 0 12px}
h3{font-size:17px;line-height:1.3;font-weight:700;margin:26px 0 8px}
p{margin:0 0 16px}
.lead{font-size:18.5px;line-height:1.6;color:var(--muted);margin:0 0 20px}
.muted{color:var(--muted)}
.small{font-size:13.5px}
.eyebrow{font-size:12px;letter-spacing:.09em;text-transform:uppercase;color:var(--faint);font-weight:700;margin:0 0 10px}

hr.rule{border:0;border-top:1px solid var(--hair);margin:40px 0}

/* ---------- Sections ---------- */
.section{padding:52px 0}
.section.tight{padding:34px 0}
.section + .section{border-top:1px solid var(--hair)}

/* ---------- Hero ---------- */
.hero{padding:56px 0 44px;text-align:center}
.portrait{
  width:132px;height:132px;border-radius:999px;overflow:hidden;
  margin:0 auto 22px;border:1px solid var(--hair);background:var(--panel);
}
.portrait img{width:100%;height:100%;object-fit:cover;display:block}
.hero h1{margin-bottom:12px}
.hero .lead{max-width:600px;margin:0 auto 22px}
.heroFacts{display:flex;gap:8px;justify-content:center;flex-wrap:wrap;margin:0 0 24px;padding:0;list-style:none}
.heroFacts li{
  font-size:12.5px;color:var(--muted);border:1px solid var(--hair);
  border-radius:999px;padding:4px 12px;background:var(--panel);
}
.ctaRow{display:flex;gap:10px;justify-content:center;flex-wrap:wrap}
.btn{
  display:inline-flex;align-items:center;gap:8px;
  border:1px solid var(--text);background:var(--text);color:var(--bg);
  padding:9px 18px;border-radius:999px;font-size:14.5px;font-weight:600;text-decoration:none;
}
.btn:hover{opacity:.87}
.btn.ghost{background:transparent;color:var(--text);border-color:var(--hair2)}
.btn.ghost:hover{border-color:var(--text);opacity:1}

/* ---------- Cards ---------- */
.cards{display:grid;gap:14px;margin-top:8px}
.cards.two{grid-template-columns:repeat(auto-fit,minmax(280px,1fr))}

.card{
  border:1px solid var(--hair);border-radius:var(--radius);padding:20px;
  background:var(--panel);display:block;text-decoration:none;color:var(--text);
}
a.card:hover{border-color:var(--hair2)}
.cardTop{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:6px}
.cardName{font-weight:740;font-size:17px}
.tag{font-size:11.5px;color:var(--muted);border:1px solid var(--hair);border-radius:999px;padding:2px 9px;font-weight:500}
.card p{margin:0 0 10px;font-size:15px;color:var(--muted)}
.card p:last-child{margin-bottom:0}
.cardLink{font-size:13.5px;color:var(--muted);text-decoration:underline;text-underline-offset:3px}

/* ---------- Stats ---------- */
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:14px;margin:22px 0 0;padding:0;list-style:none}
.stats li{border:1px solid var(--hair);border-radius:var(--radius);padding:16px 18px;background:var(--panel)}
.statNum{display:block;font-size:23px;font-weight:760;letter-spacing:-.5px;line-height:1.2}
.statLabel{display:block;font-size:13px;color:var(--muted);margin-top:3px}

/* ---------- Timeline / list ---------- */
.tl{list-style:none;margin:0;padding:0}
.tl li{padding:16px 0;border-bottom:1px solid var(--hair);display:grid;grid-template-columns:120px 1fr;gap:16px}
.tl li:last-child{border-bottom:0}
.tlWhen{font-size:13.5px;color:var(--faint);font-variant-numeric:tabular-nums;padding-top:2px}
.tlWhat strong{font-weight:700}
.tlWhat p{margin:4px 0 0;font-size:14.5px;color:var(--muted)}

/* ---------- Media ---------- */
.mediaItem{border:1px solid var(--hair);border-radius:var(--radius);padding:20px;background:var(--panel);margin-bottom:16px}
.mediaMeta{display:flex;gap:8px;align-items:center;flex-wrap:wrap;margin-bottom:8px}
.outlet{font-size:12px;font-weight:700;letter-spacing:.05em;text-transform:uppercase;color:var(--muted)}
.mediaItem h3{margin:0 0 8px;font-size:17.5px}
.mediaItem figure{margin:14px 0 0}
.mediaItem figure img{border-radius:10px;border:1px solid var(--hair);display:block;width:100%}
.credit{font-size:12.5px;color:var(--faint);margin-top:8px}

/* ---------- Post list ---------- */
.posts{list-style:none;margin:0;padding:0}
.posts li{padding:18px 0;border-bottom:1px solid var(--hair)}
.posts li:last-child{border-bottom:0}
.posts h3{margin:0 0 4px;font-size:17px}
.posts h3 a{text-decoration:none}
.posts h3 a:hover{text-decoration:underline}
.postMeta{font-size:13px;color:var(--faint)}
.posts p{margin:6px 0 0;font-size:14.5px;color:var(--muted)}

/* ---------- Article ---------- */
.article{padding:48px 0 20px}
.article h1{margin-bottom:10px}
.articleMeta{font-size:13.5px;color:var(--faint);margin-bottom:28px}
.articleBody{font-size:17px;line-height:1.75;max-width:680px}
.articleBody h2{font-size:22px;margin:38px 0 12px}
.articleBody ul,.articleBody ol{padding-left:22px;margin:0 0 18px}
.articleBody li{margin-bottom:8px}
.articleBody blockquote{margin:24px 0;padding:2px 0 2px 20px;border-left:2px solid var(--hair2);color:var(--muted);font-style:italic}
.authorBox{display:flex;gap:16px;align-items:flex-start;border:1px solid var(--hair);border-radius:var(--radius);padding:18px;background:var(--panel);margin-top:44px}
.authorBox img{width:56px;height:56px;border-radius:999px;flex:0 0 auto;border:1px solid var(--hair)}
.authorBox p{margin:0;font-size:14.5px;color:var(--muted)}
.authorBox strong{color:var(--text);display:block;margin-bottom:3px;font-size:15px}

/* ---------- Q&A (entity facts) ---------- */
.qa{margin:0;padding:0}
.qa dt{font-weight:700;margin-top:20px;font-size:16px}
.qa dd{margin:6px 0 0;color:var(--muted);font-size:15.5px}

/* ---------- Contact ---------- */
.contactList{list-style:none;margin:18px 0 0;padding:0;display:grid;gap:12px}
.contactList li{border:1px solid var(--hair);border-radius:var(--radius);padding:15px 18px;background:var(--panel);display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap;align-items:center}
.contactList .k{font-size:13px;color:var(--faint);text-transform:uppercase;letter-spacing:.06em;font-weight:700}

/* ---------- Footer ---------- */
.siteFooter{border-top:1px solid var(--hair);margin-top:60px;padding:38px 0 30px;font-size:14px}
.footGrid{display:grid;grid-template-columns:1.6fr 1fr 1fr;gap:26px}
.footName{font-weight:740;margin-bottom:6px}
.footBio{color:var(--muted);font-size:14px;margin:0;max-width:380px}
.footNav{display:flex;flex-direction:column;gap:7px}
.footNav a{color:var(--muted);text-decoration:none;font-size:14px}
.footNav a:hover{color:var(--text);text-decoration:underline}
.footBase{display:flex;justify-content:space-between;gap:12px;margin-top:30px;padding-top:16px;border-top:1px solid var(--hair);color:var(--faint);font-size:13px;flex-wrap:wrap}

@media (max-width:680px){
  .footGrid{grid-template-columns:1fr;gap:22px}
  .tl li{grid-template-columns:1fr;gap:4px}
  .tlWhen{font-size:12.5px}
  .headerInner{min-height:auto;padding-top:10px;padding-bottom:10px}
  .nav{gap:13px}
  .nav a{font-size:13.5px}
  .section{padding:40px 0}
  .articleBody{font-size:16.5px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *{animation-duration:.001ms !important;transition-duration:.001ms !important}
}

@media print{
  .siteHeader,.siteFooter,.ctaRow,.skip{display:none}
  body{color:#000;background:#fff}
}