/* IIKII Singapore — site stylesheet */
:root{
  --paper:#ffffff;
  --sand:#f6e7cc;        /* from the banner */
  --sand-deep:#eed9ae;
  --ink:#1b1b1f;
  --slate:#5c5f69;
  --rule:#e3dccd;
  --orange:#e8561e;      /* logo pixels */
  --magenta:#b8236b;
  --yellow:#f5b400;
  --purple:#6d1f9e;
  --link:#9a1f5a;
  --serif:"Source Serif 4", Georgia, "Times New Roman", serif;
  --sans:"IBM Plex Sans", "Helvetica Neue", Arial, "Noto Sans TC", sans-serif;
  --wrap:1120px;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--sans);font-size:16px;line-height:1.55}
img{max-width:100%;height:auto}
a{color:var(--link);text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:3px}
a:hover{color:var(--orange)}
a:focus-visible,button:focus-visible,input:focus-visible{outline:3px solid var(--yellow);outline-offset:2px}
h1,h2,h3{font-family:var(--serif);font-weight:600;line-height:1.18;margin:0 0 .5em}
h1{font-size:2.1rem;letter-spacing:-.01em}
h2{font-size:1.45rem}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 20px}
.skip{position:absolute;left:-999px;top:0;background:var(--ink);color:#fff;padding:8px 12px}
.skip:focus{left:8px;top:8px;z-index:50}

/* header */
.top{background:var(--paper);border-bottom:1px solid var(--rule)}
.top-row{display:flex;align-items:center;justify-content:space-between;gap:24px;min-height:84px;padding-top:10px;padding-bottom:10px}
.brand img{display:block;width:124px;height:auto}
.nav ul{list-style:none;margin:0;padding:0}
.nav>ul{display:flex;gap:4px;align-items:center}
.nav a,.nav .sub-toggle{display:block;padding:10px 12px;color:var(--ink);text-decoration:none;font-weight:500;background:none;border:0;font:inherit;font-weight:500;cursor:pointer;border-radius:4px}
.nav a:hover,.nav .sub-toggle:hover{background:var(--sand)}
.nav .sub-toggle::after{content:"";display:inline-block;width:6px;height:6px;border-right:1.5px solid currentColor;border-bottom:1.5px solid currentColor;transform:rotate(45deg);margin:0 0 3px 8px}
.nav li{position:relative}
.nav .sub{position:absolute;left:0;top:100%;min-width:230px;background:var(--paper);border:1px solid var(--rule);box-shadow:0 10px 24px rgba(27,27,31,.10);padding:6px;display:none;z-index:40}
.nav .sub a{font-weight:400;padding:8px 10px}
.nav .sub2{padding-left:14px;border-left:2px solid var(--sand-deep);margin:2px 0 4px 10px}
.nav .sub2 a{font-size:.94rem;padding:6px 10px}
.nav li.open>.sub,.nav li:hover>.sub,.nav li:focus-within>.sub{display:block}
.nav-toggle{display:none;font:inherit;background:none;border:1px solid var(--rule);padding:8px 14px;border-radius:4px;cursor:pointer}
.pixels{display:grid;grid-template-columns:repeat(96,1fr);height:12px}
.pixels i{display:block}

/* hero */
.hero{background:var(--sand)}
.hero-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:48px;align-items:center;padding-top:52px;padding-bottom:52px}
.hero h1{font-size:2.6rem;max-width:18ch}
.lede{font-size:1.1rem;color:var(--slate);max-width:60ch;margin:0 0 1.4em}
.hero-art{display:grid;grid-template-columns:repeat(18,1fr);gap:3px;aspect-ratio:18/11;justify-self:end;width:100%;max-width:440px}
.hero-art i{display:block;aspect-ratio:1;border-radius:1px}
.btn{display:inline-block;background:var(--ink);color:#fff;text-decoration:none;padding:11px 18px;border-radius:4px;font-weight:500}
.btn:hover{background:var(--orange);color:#fff}
.btn-quiet{background:transparent;color:var(--ink);border:1.5px solid var(--ink)}
.btn-quiet:hover{background:var(--ink);color:#fff}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin:0}

/* sections */
.section{padding:44px 20px 8px}
.section h2{padding-bottom:10px;border-bottom:2px solid var(--ink);margin-bottom:18px}
.pub-index{width:100%;border-collapse:collapse}
.pub-index th{text-align:left;font-weight:500;color:var(--slate);font-size:.9rem;padding:6px 10px 10px 0;border-bottom:1px solid var(--rule)}
.pub-index td{padding:16px 16px 16px 0;border-bottom:1px solid var(--rule);vertical-align:top}
.pub-index td:first-child{width:52%}
.serif-link{font-family:var(--serif);font-size:1.25rem;font-weight:600;color:var(--ink)}
.conf-row{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.conf-row li{background:var(--sand);border-radius:4px;padding:14px 18px}
.conf-row img{display:block;width:100%;height:auto;mix-blend-mode:multiply}
.about-strip{padding-bottom:56px}
.about-strip .prose{max-width:70ch}

/* breadcrumbs & shared heads */
.crumbs{font-size:.9rem;color:var(--slate);padding:18px 0 6px}
.crumbs a{color:var(--slate)}
.series-head{padding:14px 0 26px;border-bottom:1px solid var(--rule);margin-bottom:28px}
.series-head h1{max-width:30ch}
.meta-inline{display:flex;flex-wrap:wrap;gap:8px 32px;margin:12px 0 0}
.meta-inline div{display:flex;gap:8px;align-items:baseline}
.meta-inline dt{color:var(--slate);font-size:.9rem}
.meta-inline dd{margin:0;font-weight:500}

/* series */
.volumes{list-style:none;margin:0 0 36px;padding:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:16px}
.volumes li{border:1px solid var(--rule);border-left:6px solid var(--orange);padding:16px 18px;border-radius:2px}
.volumes li:nth-child(2n){border-left-color:var(--magenta)}
.volumes li:nth-child(3n){border-left-color:var(--yellow)}
.vol-title{font-family:var(--serif);font-size:1.4rem;font-weight:600;color:var(--ink);text-decoration:none}
.vol-title:hover{color:var(--orange)}
.vol-sub{display:block;color:var(--slate);font-size:.92rem;margin-top:4px}
.prose{max-width:72ch;font-size:1.02rem}
.prose p,.prose div{margin:0 0 .9em}
.prose ul{columns:2;column-gap:36px;padding-left:1.2em}
.prose li{break-inside:avoid;margin-bottom:.25em}
.prose .center{text-align:center}
.prose hr{border:0;border-top:1px solid var(--rule);margin:1.4em 0}
.prose h1{font-size:1.4rem}

/* volume */
.front-matter{margin-bottom:34px}
.front-list{list-style:none;padding:0;margin:0;display:flex;flex-wrap:wrap;gap:8px 28px;color:var(--slate)}
.front-list .pg{font-size:.9rem}
.papers-head{display:flex;justify-content:space-between;align-items:end;gap:20px;border-bottom:2px solid var(--ink);padding-bottom:8px;margin-bottom:6px}
.papers-head h2{margin:0}
.filter{display:flex;flex-direction:column;gap:4px;font-size:.85rem;color:var(--slate)}
.filter input{font:inherit;font-size:1rem;padding:8px 10px;border:1px solid var(--rule);border-radius:4px;width:300px;max-width:100%}
.paper-list{list-style:none;margin:0;padding:0}
.paper-list li{display:grid;grid-template-columns:88px 1fr;gap:16px;padding:14px 0;border-bottom:1px solid var(--rule)}
.paper-list .pages{font-family:var(--serif);font-size:1.05rem;color:var(--slate);padding-top:2px}
.paper-title{font-family:var(--serif);font-size:1.15rem;font-weight:600;color:var(--ink);text-decoration:none;display:inline}
.paper-title:hover{color:var(--orange)}
.paper-authors{display:block;color:var(--slate);margin-top:3px}
.paper-links{display:block;margin-top:5px;font-size:.88rem}
.paper-links a{margin-right:14px}
a.pdf::before{content:"";display:inline-block;width:9px;height:11px;background:var(--orange);margin-right:6px;vertical-align:-1px;border-radius:1px}
.empty{color:var(--slate);padding:20px 0}

/* paper */
.paper-head{padding:12px 0 24px;border-bottom:1px solid var(--rule);margin-bottom:28px}
.paper-head h1{max-width:34ch;font-size:2rem}
.authors{max-width:72ch;color:var(--ink)}
.authors div{margin:0 0 .15em}
.authors div:first-child{font-size:1.1rem;font-weight:500;margin-bottom:.5em}
.authors sup{font-size:.7em;color:var(--slate)}
.authors a{word-break:break-all}
.paper-grid{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:48px;padding-bottom:56px}
.paper-body h2{font-size:1.15rem;margin-top:0}
.paper-body section{margin-bottom:28px}
.abstract{text-align:justify;hyphens:auto}
.keywords{color:var(--slate);margin:0}
.paper-side{position:sticky;top:16px;align-self:start}
.btn-pdf{display:block;text-align:center;background:var(--orange);margin-bottom:18px}
.btn-pdf:hover{background:var(--ink)}
.meta-stack{margin:0;border-top:2px solid var(--ink)}
.meta-stack div{padding:10px 0;border-bottom:1px solid var(--rule)}
.meta-stack dt{font-size:.82rem;color:var(--slate)}
.meta-stack dd{margin:2px 0 0;word-break:break-word}
.side-nav{display:flex;justify-content:space-between;gap:12px;font-size:.9rem;margin-top:16px}

/* basic page */
.basic{padding:10px 0 56px}
.basic h1{max-width:28ch}
.basic .prose img{border-radius:2px}
.downloads ul{padding-left:1.2em}

/* ieee */
.ieee-group{padding:22px 0;border-bottom:1px solid var(--rule)}
.ieee-site{color:var(--slate);margin:-4px 0 14px}
.ieee-covers{display:flex;flex-wrap:wrap;gap:20px}
.ieee-covers figure{margin:0;width:360px;max-width:100%}
.ieee-covers img{display:block;width:100%;border:1px solid var(--rule);border-radius:2px}
.ieee-covers figcaption{font-size:.9rem;margin-top:6px}

/* footer */
.foot{background:var(--ink);color:#e9e4d8;margin-top:40px}
.foot a{color:#fff}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:36px;padding-top:40px;padding-bottom:24px}
.foot-id img{background:#fff;padding:6px 8px;border-radius:3px;margin-bottom:12px}
.foot-name{font-family:var(--serif);font-size:1.1rem;margin:0 0 6px}
.foot p{margin:0 0 6px;font-size:.95rem}
.foot-h{font-family:var(--serif);font-size:1.05rem;color:#fff;margin-bottom:10px}
.foot ul{list-style:none;padding:0;margin:0}
.foot li{margin-bottom:6px}
.qr-row{display:flex;gap:16px}
.qr-row figure{margin:0;text-align:center;font-size:.85rem}
.qr-row img{display:block;background:#fff;padding:4px;border-radius:3px;margin-bottom:4px}
.foot-copy{border-top:1px solid #35353b;padding-top:16px;padding-bottom:22px;font-size:.85rem;color:#b9b3a6}

@media (prefers-reduced-motion:no-preference){.nav .sub{animation:drop .12s ease-out}@keyframes drop{from{opacity:0;transform:translateY(-4px)}to{opacity:1;transform:none}}}

@media (max-width:900px){
  .hero-grid{grid-template-columns:1fr}
  .hero-art{max-width:260px;justify-self:start}
  .hero h1{font-size:2.1rem}
  .conf-row{grid-template-columns:repeat(2,1fr)}
  .paper-grid{grid-template-columns:1fr;gap:28px}
  .paper-side{position:static}
  .foot-grid{grid-template-columns:1fr 1fr}
  .pub-index td:first-child{width:auto}
}
@media (max-width:720px){
  .nav-toggle{display:inline-block}
  .nav{display:none;width:100%}
  .nav.open{display:block}
  .top-row{flex-wrap:wrap}
  .nav>ul{flex-direction:column;align-items:stretch;gap:0;padding-bottom:10px}
  .nav .sub{position:static;box-shadow:none;border:0;border-left:2px solid var(--sand-deep);margin-left:12px}
  .nav li:hover>.sub{display:none}
  .nav li.open>.sub{display:block}
  .paper-list li{grid-template-columns:1fr;gap:4px}
  .paper-list .pages{font-size:.9rem}
  .papers-head{flex-direction:column;align-items:stretch}
  .filter input{width:100%}
  .prose ul{columns:1}
  .foot-grid{grid-template-columns:1fr}
  .pub-index thead{display:none}
  .pub-index tr{display:block;padding:12px 0;border-bottom:1px solid var(--rule)}
  .pub-index td{display:block;border:0;padding:2px 0}
  h1{font-size:1.7rem}
  .paper-head h1{font-size:1.6rem}
}