/* David Liu, personal site v3 (2026-09-28, revised the same day). Plain CSS, no framework. */
:root{
  --ink:#1b2f4b;        /* header and photo bands */
  --ink-2:#16273f;      /* footer */
  --paper:#fbf8f2;      /* page background */
  --white:#ffffff;
  --text:#23272e;
  --muted:#5f6772;
  --accent:#a8782b;     /* brass, small labels and links */
  --accent-light:#e5c98f;
  --rule:#e3ddd1;
  --serif:"Playfair Display",Georgia,"Times New Roman",serif;
  --sans:"Source Sans 3","Helvetica Neue",Arial,sans-serif;
  --wrap:1100px;
  --gap:40px;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{margin:0;background:var(--paper);color:var(--text);font-family:var(--sans);font-size:18px;line-height:1.6}
img{max-width:100%;height:auto;display:block}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3{font-family:var(--serif);font-weight:400;line-height:1.15;margin:0 0 .5em;color:var(--ink)}
h1{font-size:clamp(2.1rem,4.6vw,3.5rem)}
h2{font-size:clamp(1.6rem,2.6vw,2.1rem);margin-bottom:.7em}
h3{font-size:1.2rem;font-weight:600;margin-bottom:.3em}
h1 em,h2 em{font-style:italic;font-weight:700}
p{margin:0 0 1.1em}
p:last-child{margin-bottom:0}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 24px}
.skip{position:absolute;left:-999px;top:0;background:#fff;padding:8px;z-index:99}
.skip:focus{left:8px}

/* header */
.site-header{background:var(--ink);color:#fff;text-align:center;padding:26px 16px 0}
.site-header .name{font-family:var(--serif);font-size:clamp(1.5rem,3vw,2.1rem);letter-spacing:.12em;text-transform:uppercase;color:#fff;display:inline-block;margin-bottom:12px}
.site-header .name:hover{text-decoration:none;color:var(--accent-light)}
.site-nav{list-style:none;margin:0;padding:0 0 16px;display:flex;flex-wrap:wrap;justify-content:center;gap:4px 26px}
.site-nav a{color:#e9e4d8;font-size:.86rem;letter-spacing:.14em;text-transform:uppercase;font-weight:600;padding:6px 0;border-bottom:2px solid transparent;display:inline-block}
.site-nav a:hover{text-decoration:none;color:#fff}
.site-nav a[aria-current="page"]{color:var(--accent-light);border-bottom-color:var(--accent-light)}
@media (max-width:640px){.site-nav{gap:2px 16px}.site-nav a{font-size:.78rem;letter-spacing:.1em}}

/* about hero */
.hero{padding:56px 0 48px}
.hero .grid{display:grid;grid-template-columns:1.35fr 1fr;gap:var(--gap);align-items:start}
.kicker{font-size:.95rem;color:var(--ink);margin:0 0 20px;font-weight:600}
.hero h1{margin-bottom:24px}
.hero p{font-size:1.05rem}
.hero .portrait img{width:100%;max-width:420px;margin:0 0 0 auto;border-radius:3px;box-shadow:0 14px 34px rgba(27,47,75,.16)}
.roles{list-style:none;padding:0;margin:24px 0 0;display:flex;gap:14px;flex-wrap:wrap;font-size:.8rem;letter-spacing:.18em;text-transform:uppercase;color:var(--accent);font-weight:700}
.roles li+li::before{content:"\2022";margin-right:14px;color:var(--accent)}
@media (max-width:820px){.hero .grid{grid-template-columns:1fr}.hero .portrait{order:-1}.hero .portrait img{max-width:340px;margin:0 auto}}

/* photo band (About) */
.band{background:var(--ink);color:#fff;padding:64px 0}
.band .grid{display:grid;grid-template-columns:1fr 1.1fr 1fr;gap:34px;align-items:center}
.band .col{display:flex;flex-direction:column;gap:34px}
.band figure{margin:0}
.band figure img{width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:3px}
.band figcaption{font-size:.78rem;letter-spacing:.22em;text-transform:uppercase;font-weight:700;margin-bottom:10px;color:#fff}
.band .center{text-align:center;padding:10px}
.band .center .roles{justify-content:center;color:var(--accent-light);margin:0 0 14px}
.band .center .roles li+li::before{color:var(--accent-light)}
.band .center h2{color:#fff;font-size:clamp(2.6rem,5vw,4.2rem);line-height:1.02;margin:0}
.band .center h2 em{color:var(--accent-light)}
.band .center p{color:#d8d3c7;font-size:1rem;margin-top:18px}
@media (max-width:900px){.band .grid{grid-template-columns:1fr 1fr}.band .center{grid-column:1/-1;order:-1}}
@media (max-width:560px){.band .grid{grid-template-columns:1fr}}

/* sections */
.section{padding:60px 0}
.section.white{background:var(--white)}
.section > .wrap > h2:first-child{margin-top:0}
h2.title{text-align:center;margin-bottom:36px}

/* explore */
.explore{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(3,1fr);gap:32px 28px}
.explore a{display:block;color:var(--text)}
.explore a:hover{text-decoration:none}
.explore img{width:100%;aspect-ratio:3/2;object-fit:cover;border-radius:3px;margin-bottom:12px;transition:transform .35s ease}
.explore a:hover img{transform:scale(1.02)}
.explore h3{margin-bottom:4px;color:var(--ink)}
.explore a:hover h3{color:var(--accent)}
.explore p{font-size:.98rem;color:var(--muted);margin:0}
@media (max-width:820px){.explore{grid-template-columns:1fr 1fr}}
@media (max-width:520px){.explore{grid-template-columns:1fr}}

/* document cards */
.docs{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(3,1fr);gap:36px 28px}
.docs.two-up{grid-template-columns:repeat(2,1fr)}
.doc{display:flex;flex-direction:column;min-width:0}
.doc .thumb{display:block;border:1px solid var(--rule);background:#fff;aspect-ratio:4/3;overflow:hidden;border-radius:2px}
.doc .thumb img{width:100%;height:100%;object-fit:cover;object-position:top;transition:transform .35s ease}
.doc .thumb:hover img{transform:scale(1.02)}
.doc h3{font-size:1.08rem;line-height:1.3;margin:14px 0 4px}
.doc .meta{font-size:.9rem;color:var(--muted);margin:0 0 12px;line-height:1.45}
.doc .links{margin:auto 0 0}
@media (max-width:900px){.docs{grid-template-columns:1fr 1fr}}
@media (max-width:560px){.docs,.docs.two-up{grid-template-columns:1fr}}

/* buttons: one style everywhere */
.links{display:flex;flex-wrap:wrap;gap:10px;margin:18px 0 0;padding:0;list-style:none}
.links a{display:inline-flex;align-items:center;height:38px;padding:0 14px;border:1.5px solid var(--ink);border-radius:2px;color:var(--ink);font-size:.86rem;font-weight:600;letter-spacing:.03em;white-space:nowrap}
.links a:hover{background:var(--ink);color:#fff;text-decoration:none}
.links a.quiet{border-color:var(--rule);color:var(--muted)}
.links a.quiet:hover{background:transparent;color:var(--ink);border-color:var(--ink)}

/* theme pages */
.banner{height:clamp(220px,36vw,420px);overflow:hidden;background:var(--ink)}
.banner img{width:100%;height:100%;object-fit:cover;object-position:center 30%}
.page-hero{padding:52px 0 12px;text-align:center}
.page-hero h1{max-width:880px;margin:0 auto 14px}
.page-hero .role{font-size:.84rem;letter-spacing:.18em;text-transform:uppercase;color:var(--accent);font-weight:700;margin:0 0 32px}
.prose{max-width:760px;margin:0 auto;text-align:left}
.page-hero .prose{text-align:center}
.prose.wide{max-width:860px}
.two{display:grid;grid-template-columns:1fr 1fr;gap:var(--gap);align-items:start}
.two.text-wide{grid-template-columns:1.4fr 1fr}
.two.rev > figure{order:-1}
.two figure{margin:0}
.two figure img,.gallery img{width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:3px}
.two figure.tall img,.gallery.tall img{aspect-ratio:3/4}
.two figure.free img,.gallery.free img{aspect-ratio:auto}
figcaption{font-size:.88rem;color:var(--muted);margin-top:8px;line-height:1.45}
@media (max-width:820px){.two,.two.text-wide{grid-template-columns:1fr}.two.rev > figure{order:0}}
.gallery{display:grid;grid-template-columns:repeat(3,1fr);gap:28px;margin:0;padding:0;list-style:none}
.gallery.two-up{grid-template-columns:repeat(2,1fr)}
.gallery figure{margin:0}
@media (max-width:820px){.gallery{grid-template-columns:1fr 1fr}}
@media (max-width:520px){.gallery,.gallery.two-up{grid-template-columns:1fr}}
.figure{margin:0 auto;max-width:720px}
.figure img{border-radius:3px;border:1px solid var(--rule)}
.pull{border-left:3px solid var(--accent-light);margin:26px 0;padding:4px 0 4px 22px;font-family:var(--serif);font-size:1.18rem;font-style:italic;color:var(--ink);line-height:1.45}
.pull cite{display:block;font-family:var(--sans);font-style:normal;font-size:.88rem;color:var(--muted);margin-top:8px}
.results{list-style:none;padding:0;margin:0 0 6px}
.results li{padding:12px 0;border-bottom:1px solid var(--rule)}
.results li:first-child{border-top:1px solid var(--rule)}
.results strong{color:var(--ink)}
.sub{font-size:.95rem;color:var(--muted);margin:-4px 0 12px}
.stack > * + *{margin-top:28px}

/* footer */
.site-footer{background:var(--ink-2);color:#cfc9bc;padding:38px 0 30px;text-align:center;font-size:.92rem}
.site-footer .name{font-family:var(--serif);color:#fff;letter-spacing:.12em;text-transform:uppercase;font-size:1.1rem;display:block;margin-bottom:12px}
.site-footer ul{list-style:none;margin:0 0 16px;padding:0;display:flex;flex-wrap:wrap;justify-content:center;gap:4px 20px}
.site-footer a{color:#e2ddd1}
.site-footer small{display:block;color:#9d9789}

/* reveal */
.js .reveal{opacity:0;transform:translateY(14px);transition:opacity .7s ease,transform .7s ease}
.js .reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){.js .reveal{opacity:1;transform:none;transition:none}}