/* ============================================================
   Paper — design system (light + dark)
   Type: Newsreader (display + body) · JetBrains Mono (labels)
   ============================================================ */

*{ margin:0; padding:0; box-sizing:border-box; }
html{ scroll-behavior:smooth; }

:root[data-theme="light"]{
  --bg:#f6f2ea; --surface:#efe8da; --surface-2:#ece4d5;
  --text:#211e18; --muted:#5e564a; --faint:#6b6253;
  --line:#ddd3c2; --accent:#7a2e2e; --accent-ink:#5e2424;
  --grain:.045; --grain-blend:multiply;
}
:root[data-theme="dark"]{
  --bg:#16140f; --surface:#1e1b15; --surface-2:#221e17;
  --text:#ece7dd; --muted:#a99f8e; --faint:#9a9080;
  --line:#332e25; --accent:#d2796a; --accent-ink:#e6a394;
  --grain:.07; --grain-blend:screen;
}

body{
  font-family:'Newsreader',Georgia,serif; background:var(--bg); color:var(--text);
  line-height:1.6; -webkit-font-smoothing:antialiased; position:relative;
  transition:background .4s ease, color .4s ease;
}
/* paper grain atmosphere */
body::before{
  content:""; position:fixed; inset:0; z-index:1; pointer-events:none; opacity:var(--grain);
  mix-blend-mode:var(--grain-blend);
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}
/* warm halo + bottom vignette for depth */
body::after{
  content:""; position:fixed; inset:0; z-index:0; pointer-events:none;
  background:
    radial-gradient(90% 55% at 50% -10%, color-mix(in srgb,var(--accent) 8%, transparent), transparent 60%),
    radial-gradient(130% 80% at 50% 112%, transparent 72%, color-mix(in srgb,#000 6%, transparent));
}

a{ color:inherit; }
.wrap{ max-width:1040px; margin:0 auto; padding:0 2.5rem; position:relative; z-index:2; }
.mono{ font-family:'JetBrains Mono',monospace; }

/* animated underline link */
.ulink{ position:relative; text-decoration:none; }
.ulink::after{ content:""; position:absolute; left:0; bottom:-2px; width:100%; height:1px; background:var(--accent);
  transform:scaleX(0); transform-origin:left; transition:transform .3s ease; }
.ulink:hover::after{ transform:scaleX(1); }

/* ===== Nav ===== */
.nav{ position:sticky; top:0; z-index:50; background:color-mix(in srgb,var(--bg) 86%,transparent);
  backdrop-filter:blur(10px); border-bottom:1px solid var(--line); }
.nav-inner{ max-width:1040px; margin:0 auto; padding:1.15rem 2.5rem; display:flex; align-items:center; justify-content:space-between; }
.brand{ font-family:'Newsreader',serif; font-weight:600; font-size:1.15rem; letter-spacing:-.01em; text-decoration:none; color:var(--text); }
.nav-menu{ list-style:none; display:flex; gap:1.7rem; align-items:center; font-family:'JetBrains Mono',monospace; font-size:.78rem; }
.nav-menu a{ text-decoration:none; color:var(--muted); transition:color .2s; }
.nav-menu a:hover,.nav-menu a.active{ color:var(--accent); }
.toggle{ cursor:pointer; border:1px solid var(--line); background:var(--surface); color:var(--muted);
  border-radius:999px; padding:.35rem .75rem; font-family:'JetBrains Mono',monospace; font-size:.72rem;
  display:inline-flex; align-items:center; gap:.4rem; transition:.2s; }
.toggle:hover{ color:var(--accent); border-color:var(--accent); }
.nav-burger{ display:none; flex-direction:column; gap:5px; background:none; border:none; cursor:pointer; padding:.3rem; }
.nav-burger span{ width:22px; height:2px; background:var(--text); transition:.25s; }

/* ===== Hero (home) — editorial / asymmetric ===== */
h1{ font-family:'Newsreader',serif; font-weight:500; letter-spacing:-.02em; }
.hero{ position:relative; padding:2.5rem 0 3rem; }
.masthead{ display:flex; flex-wrap:wrap; gap:.6rem 1.5rem; justify-content:space-between;
  font-family:'JetBrains Mono',monospace; font-size:.72rem; letter-spacing:.18em; text-transform:uppercase;
  color:var(--muted); padding-bottom:1.1rem; border-bottom:1px solid var(--line); }
.masthead .accent{ color:var(--accent); }
.hero-body{ position:relative; margin-top:2.75rem; min-height:clamp(200px,24vw,300px); }
.hero-name{ font-family:'Newsreader',serif; font-weight:500; font-size:clamp(3.4rem,12.5vw,9rem);
  line-height:.86; letter-spacing:-.035em; max-width:9ch; overflow-wrap:break-word; }
.hero-name em{ font-style:italic; color:var(--accent); }
.hero-photo{ position:absolute; top:.3rem; right:0; width:clamp(150px,19vw,225px); aspect-ratio:4/5;
  object-fit:cover; object-position:center top; border-radius:10px; border:1px solid var(--line);
  box-shadow:0 30px 60px -28px rgba(80,40,20,.55); filter:grayscale(.12); }
.hero-lower{ display:flex; flex-wrap:wrap; justify-content:space-between; align-items:flex-end; gap:1.75rem; margin-top:2.5rem; }
.hero-lower .left{ max-width:46ch; }
.role{ font-family:'Newsreader',serif; font-style:italic; font-size:1.4rem; color:var(--muted); }
.role b{ font-style:normal; font-weight:600; color:var(--accent); }
.sub{ font-family:'JetBrains Mono',monospace; font-size:.78rem; color:var(--muted); margin-top:.6rem; letter-spacing:.02em; }
.tags{ display:flex; flex-wrap:wrap; gap:.5rem; margin-top:1.4rem; }
.tags span{ font-family:'JetBrains Mono',monospace; font-size:.74rem; padding:.4rem .85rem; background:var(--surface-2);
  border:1px solid var(--line); border-radius:5px; color:var(--muted); }
.social{ display:flex; flex-direction:column; align-items:flex-end; gap:.55rem; font-family:'JetBrains Mono',monospace; font-size:.8rem; }
.social a{ color:var(--accent); }

/* staggered load reveal */
.reveal{ opacity:0; transform:translateY(14px); animation:rise .7s cubic-bezier(.2,.7,.2,1) forwards; }
.d1{ animation-delay:.05s } .d2{ animation-delay:.16s } .d3{ animation-delay:.27s }
.d4{ animation-delay:.38s } .d5{ animation-delay:.49s } .d6{ animation-delay:.60s }
@keyframes rise{ to{ opacity:1; transform:none; } }
@media (prefers-reduced-motion:reduce){ .reveal{ animation:none; opacity:1; transform:none; } }

.rule{ height:1px; background:var(--line); margin:1rem 0 3.5rem; }

/* ===== Generic page chrome ===== */
main{ padding:2rem 0 1rem; }
.page-title{ font-family:'Newsreader',serif; font-weight:500; font-size:clamp(2.2rem,4.5vw,3.4rem); letter-spacing:-.02em; margin:2.5rem 0 2.5rem; line-height:1.04; }
.section-title{ font-family:'Newsreader',serif; font-weight:500; font-size:1.9rem; letter-spacing:-.01em; margin:1rem 0 1.5rem; }
.sec-h{ font-family:'JetBrains Mono',monospace; font-size:.74rem; letter-spacing:.16em; text-transform:uppercase;
  color:var(--faint); margin-bottom:1.3rem; display:flex; align-items:baseline; gap:.6rem; }
.sec-h .num{ color:var(--accent); font-weight:500; }
.lead{ font-size:1.2rem; color:var(--muted); max-width:64ch; margin-bottom:2rem; line-height:1.6; }
.lead a{ color:var(--accent); font-weight:600; }

/* two-column About/News (home) */
.grid{ display:grid; grid-template-columns:1.45fr 1fr; gap:4rem; padding-bottom:4rem; }
.about p{ font-size:1.24rem; line-height:1.66; max-width:58ch; margin-bottom:1.1rem; }
.about p b{ color:var(--accent); font-weight:600; }
.about p.muted{ color:var(--muted); }
.about .first::first-letter{ font-family:'Newsreader',serif; font-weight:600; font-size:3.1rem; float:left;
  line-height:.8; padding:.35rem .55rem .1rem 0; color:var(--accent); }

/* news */
.news .item{ padding:1rem 0; border-bottom:1px solid var(--line); }
.news .item:last-child{ border-bottom:none; }
.news .date{ font-family:'JetBrains Mono',monospace; font-size:.72rem; letter-spacing:.04em; text-transform:uppercase; color:var(--faint); margin-bottom:.2rem; }
.news .t{ font-family:'Newsreader',serif; font-size:1.15rem; font-weight:500; }
.news .l{ font-family:'JetBrains Mono',monospace; font-size:.74rem; color:var(--accent); display:inline-block; margin-top:.3rem; }
.news-more{ margin-top:1.5rem; }
.news-more a{ font-family:'JetBrains Mono',monospace; font-size:.76rem; letter-spacing:.04em; color:var(--accent); }

/* news archive page — date-rail feed */
.news-feed{ margin-top:.5rem; }
.nf-item{ display:grid; grid-template-columns:minmax(0,170px) 1fr; gap:2.5rem;
  padding:1.6rem 1rem; margin:0 -1rem; border-top:1px solid var(--line); border-radius:8px;
  transition:background .2s ease; }
.news-feed .nf-item:last-child{ border-bottom:1px solid var(--line); }
.nf-item:hover{ background:var(--surface); }
.nf-date{ font-family:'JetBrains Mono',monospace; font-size:.74rem; letter-spacing:.08em; text-transform:uppercase;
  color:var(--accent); padding-top:.3rem; }
.nf-body{ min-width:0; }
.nf-body h3{ font-family:'Newsreader',serif; font-weight:500; font-size:1.25rem; letter-spacing:-.01em; }
.nf-body p{ color:var(--muted); margin-top:.4rem; max-width:64ch; line-height:1.6; }
.nf-body .l{ font-family:'JetBrains Mono',monospace; font-size:.76rem; color:var(--accent); display:inline-block; margin-top:.5rem; }

/* projects (research) — editorial numbered grid */
.project{ display:grid; grid-template-columns:minmax(0,96px) 1fr; gap:2.5rem;
  padding-bottom:2.75rem; margin-bottom:2.75rem; border-bottom:1px solid var(--line); }
.project:last-child{ border-bottom:none; }
.project .idx{ font-family:'Newsreader',serif; font-style:italic; font-weight:500; font-size:3.4rem;
  line-height:.85; color:var(--accent); transition:transform .35s cubic-bezier(.2,.7,.2,1); }
.project:hover .idx{ transform:translateX(6px); }
.project .body{ min-width:0; }
.project h3{ font-family:'Newsreader',serif; font-size:1.6rem; font-weight:500; margin-bottom:.8rem; letter-spacing:-.01em; }
.project p{ font-size:1.1rem; line-height:1.7; margin-bottom:.9rem; max-width:72ch; }
.project p b{ color:var(--accent); font-weight:600; }
.project ul{ margin:0 0 1rem 1.3rem; }
.project li{ margin-bottom:.5rem; line-height:1.6; color:var(--muted); max-width:72ch; }
.linkrow{ display:flex; flex-wrap:wrap; gap:1.3rem; }
.linkrow a{ font-family:'JetBrains Mono',monospace; font-size:.78rem; color:var(--accent); }

/* interests */
.interests{ list-style:none; }
.interests li{ padding:1.1rem 0; border-bottom:1px solid var(--line); max-width:74ch; font-size:1.1rem; line-height:1.65; }
.interests li:last-child{ border-bottom:none; }
.interests b{ font-family:'Newsreader',serif; color:var(--accent); font-weight:600; }

/* publications — editorial sticky-label sections */
.pubsec{ display:grid; grid-template-columns:minmax(0,150px) 1fr; gap:2.5rem; margin-bottom:2.75rem;
  padding-top:1.5rem; border-top:1px solid var(--line); }
.pubsec-h{ font-family:'JetBrains Mono',monospace; font-size:.74rem; letter-spacing:.16em; text-transform:uppercase;
  color:var(--accent); position:sticky; top:5rem; align-self:start; }
.pubsec-list{ min-width:0; }
.pub{ padding:1.15rem 1rem; margin:0 -1rem; border-bottom:1px solid var(--line); border-radius:8px;
  transition:background .2s ease, box-shadow .2s ease; }
.pub:hover{ background:var(--surface); box-shadow:inset 2px 0 0 var(--accent); }
.pub:last-child{ border-bottom:none; }
.pub .title{ font-family:'Newsreader',serif; font-size:1.18rem; font-weight:600; margin-bottom:.3rem; line-height:1.3; }
.pub .authors{ font-size:1.02rem; margin-bottom:.2rem; }
.pub .authors b{ color:var(--accent); }
.pub .venue{ font-style:italic; color:var(--muted); margin-bottom:.55rem; }
.pub .links{ display:flex; gap:1.2rem; }
.pub .links a{ font-family:'JetBrains Mono',monospace; font-size:.76rem; color:var(--accent); }

/* contact */
.card{ background:var(--surface); border:1px solid var(--line); border-radius:10px; padding:1.85rem; margin-bottom:2.25rem; }
.card p{ margin-bottom:.55rem; font-size:1.08rem; }
.card p:last-child{ margin-bottom:0; }
.card a{ color:var(--accent); }
.form{ max-width:620px; }
.field{ margin-bottom:1.25rem; }
.field label{ display:block; font-family:'JetBrains Mono',monospace; font-size:.74rem; letter-spacing:.06em; text-transform:uppercase; color:var(--muted); margin-bottom:.5rem; }
.field input,.field textarea{ width:100%; padding:.8rem; font-family:'Newsreader',serif; font-size:1.05rem;
  background:var(--bg); color:var(--text); border:1px solid var(--line); border-radius:6px; transition:border-color .2s; }
.field input:focus,.field textarea:focus{ outline:none; border-color:var(--accent); }
.field textarea{ resize:vertical; min-height:130px; }
.btn{ font-family:'JetBrains Mono',monospace; font-size:.82rem; letter-spacing:.04em; cursor:pointer;
  background:var(--accent); color:#fff; border:none; padding:.8rem 1.8rem; border-radius:6px; transition:.2s; }
.btn:hover{ background:var(--accent-ink); }

/* 404 */
.center{ text-align:center; padding:6rem 0; }
.center .big{ font-family:'Newsreader',serif; font-size:7rem; font-weight:500; color:var(--accent); line-height:1; }
.center .lead{ margin-left:auto; margin-right:auto; }

/* ===== Footer ===== */
footer{ border-top:1px solid var(--line); background:var(--surface); padding:2.5rem 0; margin-top:3rem; position:relative; z-index:2; }
.footer-inner{ max-width:1040px; margin:0 auto; padding:0 2.5rem; font-family:'JetBrains Mono',monospace; font-size:.74rem;
  color:var(--faint); display:flex; justify-content:space-between; flex-wrap:wrap; gap:.5rem; }

/* ===== For Students / mentoring guide ===== */
.guide-sec{ margin-bottom:4rem; }
.guide-sec:last-of-type{ margin-bottom:2.5rem; }
.lead em{ font-style:italic; color:var(--accent); }
.about p em{ font-style:italic; color:var(--accent); }
.guide-tags{ margin-top:1.1rem; }
.guide-card{ margin-top:2rem; }
.guide-cta{ margin-top:1rem; }
.guide-note{ font-size:1.1rem; color:var(--muted); max-width:70ch; margin-bottom:1.5rem; line-height:1.6; }
.interests code{ font-family:'JetBrains Mono',monospace; font-size:.86em; background:var(--surface-2);
  border:1px solid var(--line); border-radius:4px; padding:.05em .4em; color:var(--accent); }
.interests a.ulink{ color:var(--accent); }
.setup-step p a{ color:var(--accent); }
.setup-step code{ font-family:'JetBrains Mono',monospace; font-size:.86em; background:var(--surface-2);
  border:1px solid var(--line); border-radius:4px; padding:.05em .4em; color:var(--accent); }

/* setup steps + command blocks */
.setup-step{ padding:1.5rem 0; border-bottom:1px solid var(--line); }
.setup-step:last-child{ border-bottom:none; }
.setup-step h3{ font-family:'Newsreader',serif; font-weight:600; font-size:1.2rem; letter-spacing:-.01em; }
.setup-step p{ color:var(--muted); margin-top:.4rem; max-width:72ch; line-height:1.6; }
.setup-step p + .cmd{ margin-top:.85rem; }
.cmd{ font-family:'JetBrains Mono',monospace; font-size:.8rem; line-height:1.75; color:var(--text);
  background:var(--surface); border:1px solid var(--line); border-radius:8px;
  padding:1rem 1.15rem; margin:.85rem 0 1rem; overflow-x:auto; white-space:pre; -webkit-overflow-scrolling:touch; }
.cmd .c{ color:var(--faint); }
.cmd + p{ margin-top:0; }
.guide-talks{ margin-bottom:1.75rem; }

/* code blocks with OS tabs + copy */
.codeblock{ border:1px solid var(--line); border-radius:9px; overflow:hidden; margin:1rem 0 1.25rem; background:var(--surface); }
.cb-bar{ display:flex; align-items:center; justify-content:space-between; gap:1rem;
  padding:.4rem .5rem .4rem .75rem; border-bottom:1px solid var(--line); background:var(--surface-2); }
.cb-tabs{ display:flex; gap:.25rem; flex-wrap:wrap; }
.cb-tab{ font-family:'JetBrains Mono',monospace; font-size:.72rem; letter-spacing:.02em; cursor:pointer;
  border:1px solid transparent; background:none; color:var(--muted); padding:.32rem .65rem; border-radius:6px; transition:.15s; }
.cb-tab:hover{ color:var(--text); }
.cb-tab.active{ color:var(--accent); background:var(--bg); border-color:var(--line); }
.cb-label{ font-family:'JetBrains Mono',monospace; font-size:.68rem; letter-spacing:.12em; text-transform:uppercase; color:var(--faint); padding-left:.15rem; }
.cb-copy{ font-family:'JetBrains Mono',monospace; font-size:.72rem; cursor:pointer; color:var(--muted); flex:none;
  border:1px solid var(--line); background:var(--bg); padding:.32rem .75rem; border-radius:6px; transition:.15s; }
.cb-copy:hover{ color:var(--accent); border-color:var(--accent); }
.cb-copy.copied{ color:var(--accent); border-color:var(--accent); }
.cb-pre{ font-family:'JetBrains Mono',monospace; font-size:.8rem; line-height:1.75; color:var(--text);
  padding:1rem 1.15rem; margin:0; overflow-x:auto; white-space:pre; -webkit-overflow-scrolling:touch; }
.cb-pre .c{ color:var(--faint); }

/* students hub cards */
.hub{ display:grid; grid-template-columns:repeat(2,1fr); gap:1.25rem; margin:1rem 0 1.5rem; }
.hub-card{ display:block; text-decoration:none; color:inherit; border:1px solid var(--line); border-radius:12px;
  padding:1.6rem 1.7rem; background:var(--surface);
  transition:transform .28s cubic-bezier(.2,.7,.2,1), box-shadow .28s, border-color .2s; }
.hub-card:hover{ transform:translateY(-3px); border-color:var(--accent); box-shadow:0 22px 44px -30px rgba(80,40,20,.55); }
.hub-card .hc-num{ font-family:'Newsreader',serif; font-style:italic; font-weight:500; font-size:1.7rem; color:var(--accent); line-height:1; }
.hub-card h3{ font-family:'Newsreader',serif; font-weight:600; font-size:1.35rem; letter-spacing:-.01em; margin:.4rem 0 .5rem; }
.hub-card p{ color:var(--muted); font-size:1rem; line-height:1.55; }
.hub-card .hc-go{ font-family:'JetBrains Mono',monospace; font-size:.74rem; color:var(--accent); display:inline-block; margin-top:1rem; }

/* sub-page breadcrumb + pager */
.crumb{ font-family:'JetBrains Mono',monospace; font-size:.74rem; color:var(--muted); text-decoration:none; display:inline-block; margin-bottom:.5rem; }
.crumb:hover{ color:var(--accent); }
.pager{ display:flex; justify-content:space-between; gap:1rem; margin-top:3.5rem; padding-top:1.5rem;
  border-top:1px solid var(--line); font-family:'JetBrains Mono',monospace; font-size:.78rem; }
.pager a{ color:var(--accent); text-decoration:none; max-width:48%; }
.pager a:hover{ text-decoration:underline; }
.pager .spacer{ flex:1; }

/* ===== Responsive ===== */
@media(max-width:760px){
  .nav-burger{ display:flex; }
  .nav-menu{ position:absolute; top:100%; left:0; right:0; flex-direction:column; align-items:flex-start;
    gap:1.1rem; padding:1.25rem 2.5rem; background:var(--bg); border-bottom:1px solid var(--line); display:none; }
  .nav-menu.open{ display:flex; }
  .hero{ padding-top:2rem; }
  .hero-body{ min-height:0; }
  .hero-photo{ position:static; width:130px; aspect-ratio:4/5; margin-bottom:1.25rem; }
  .hero-name{ font-size:clamp(2.6rem,14vw,4rem); max-width:none; line-height:.95; }
  .hero-lower{ flex-direction:column; align-items:flex-start; gap:1.25rem; }
  .social{ align-items:flex-start; }
  .masthead{ font-size:.66rem; letter-spacing:.12em; }
  .grid{ grid-template-columns:1fr; gap:2.5rem; }
  .project{ grid-template-columns:1fr; gap:.4rem; }
  .project .idx{ font-size:2.4rem; }
  .pubsec{ grid-template-columns:1fr; gap:.6rem; }
  .pubsec-h{ position:static; }
  .nf-item{ grid-template-columns:1fr; gap:.4rem; }
  .hub{ grid-template-columns:1fr; }
  .about .first::first-letter{ float:none; font-size:inherit; padding:0; color:inherit; }
  .wrap,.nav-inner,.footer-inner{ padding-left:1.5rem; padding-right:1.5rem; }
}