:root{
  --bg: #F5F7FA;
  --surface: #FFFFFF;
  --ink: #0B1220;
  --ink-soft: #5B6472;
  --line: #E3E7EE;
  --blue: #2451FF;
  --blue-dim: rgba(36,81,255,0.08);
  --blue-mid: rgba(36,81,255,0.35);
  --teal: #0EA894;
  --teal-dim: rgba(14,168,148,0.10);
  --teal-mid: rgba(14,168,148,0.35);
  --amber: #F2A93B;
  --amber-dim: rgba(242,169,59,0.12);
  --nav-bg: rgba(245,247,250,0.82);
  --blob-opacity: .16;
  --max: 1040px;
  --ease: cubic-bezier(.22,.61,.36,1);
  --radius: 14px;
}
html[data-theme="dark"]{
  --bg: #0B0E14;
  --surface: #131722;
  --ink: #EDEFF3;
  --ink-soft: #97A0B0;
  --line: #232838;
  --blue: #6E8CFF;
  --blue-dim: rgba(110,140,255,0.14);
  --blue-mid: rgba(110,140,255,0.45);
  --teal: #2DD4BF;
  --teal-dim: rgba(45,212,191,0.14);
  --teal-mid: rgba(45,212,191,0.45);
  --amber: #FBBF53;
  --amber-dim: rgba(251,191,83,0.16);
  --nav-bg: rgba(11,14,20,0.78);
  --blob-opacity: .28;
}

*{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }
body{
  margin:0; background:var(--bg); color:var(--ink);
  font-family:'IBM Plex Sans', sans-serif; font-size:17px; line-height:1.62;
  -webkit-font-smoothing:antialiased; overflow-x:hidden;
  transition: background .25s ease, color .25s ease;
}
h1,h2,h3,.display{ font-family:'Space Grotesk', sans-serif; font-weight:600; letter-spacing:-0.015em; margin:0; }
a{ color:inherit; }
.mono{ font-family:'IBM Plex Mono', monospace; }
.wrap{ max-width:var(--max); margin:0 auto; padding:0 32px; }

/* ---------- NAV ---------- */
header.site{ position:sticky; top:0; background:var(--nav-bg); backdrop-filter:blur(10px); border-bottom:1px solid var(--line); z-index:20; }
nav.wrap{ display:flex; align-items:center; justify-content:space-between; height:68px; gap:20px; }
.brand{ display:flex; align-items:center; gap:10px; text-decoration:none; color:var(--ink); }
.brand svg{ width:26px; height:26px; color:var(--ink-soft); }
.brand .name{ font-family:'Space Grotesk', sans-serif; font-weight:600; font-size:1.05rem; }
nav .nav-right{ display:flex; align-items:center; gap:22px; }
nav .links{ display:flex; gap:26px; align-items:center; }
nav .links a{ position:relative; text-decoration:none; font-size:0.9rem; color:var(--ink-soft); transition:color .15s ease; padding-bottom:3px; white-space:nowrap; }
nav .links a::after{ content:""; position:absolute; left:0; right:100%; bottom:0; height:1.5px; background:linear-gradient(90deg, var(--blue), var(--teal)); transition:right .3s var(--ease); }
nav .links a:hover{ color:var(--ink); }
nav .links a:hover::after, nav .links a.active::after{ right:0; }
nav .links a.active{ color:var(--ink); }
.theme-toggle{ width:36px; height:36px; border-radius:8px; border:1px solid var(--line); background:var(--surface); display:flex; align-items:center; justify-content:center; cursor:pointer; color:var(--ink-soft); transition:all .2s ease; flex:none; }
.theme-toggle:hover{ border-color:var(--blue); color:var(--blue); }
.theme-toggle svg{ width:18px; height:18px; }
html:not([data-theme="dark"]) .icon-moon{ display:none; }
html[data-theme="dark"] .icon-sun{ display:none; }
@media (max-width:760px){ nav .links{ gap:14px; } .brand .name{ font-size:0.95rem; } nav .links a{ font-size:0.8rem; } nav .nav-right{ gap:12px; } }

/* ---------- HERO ---------- */
.hero-outer{ position:relative; overflow:hidden; }
.hero-outer::before{
  content:""; position:absolute; inset:-10% -10% auto -10%; height:640px;
  background-image: radial-gradient(circle, var(--line) 1px, transparent 1.4px);
  background-size:26px 26px;
  -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 30%, black 40%, transparent 78%);
  mask-image: radial-gradient(ellipse 70% 60% at 50% 30%, black 40%, transparent 78%);
  pointer-events:none;
}
.blob{ position:absolute; border-radius:50%; filter:blur(70px); pointer-events:none; opacity:var(--blob-opacity); animation:driftBlob 12s ease-in-out infinite alternate; }
.blob.b1{ width:360px; height:360px; background:var(--blue); top:-80px; right:-40px; }
.blob.b2{ width:280px; height:280px; background:var(--teal); bottom:-60px; left:10%; animation-delay:2s; }
@keyframes driftBlob{ from{ transform:translate(0,0); } to{ transform:translate(18px,-14px); } }
.hero{ position:relative; padding:96px 0 84px; display:grid; grid-template-columns:1.1fr 0.9fr; gap:40px; align-items:center; }
.hero h1{ font-size:clamp(2.3rem, 4.6vw, 3.4rem); line-height:1.1; max-width:17ch; opacity:0; animation:rise .8s var(--ease) forwards; animation-delay:.05s; }
.hero .role{ margin-top:20px; color:var(--ink-soft); font-size:1.04rem; max-width:50ch; opacity:0; animation:rise .8s var(--ease) forwards; animation-delay:.2s; }
.hero .role strong{ color:var(--ink); font-weight:500; }
.hero .cta-row{ margin-top:32px; display:flex; gap:14px; flex-wrap:wrap; opacity:0; animation:rise .8s var(--ease) forwards; animation-delay:.34s; }
@keyframes rise{ from{ opacity:0; transform:translateY(14px);} to{ opacity:1; transform:translateY(0);} }
.btn{ display:inline-flex; align-items:center; gap:8px; padding:11px 20px; border-radius:8px; text-decoration:none; font-size:0.92rem; font-weight:500; border:1px solid transparent; transition:transform .2s var(--ease), box-shadow .2s var(--ease), background .2s ease, border-color .2s ease; }
.btn.primary{ background:var(--ink); color:var(--bg); }
.btn.primary:hover{ transform:translateY(-2px); box-shadow:0 10px 24px -10px rgba(11,18,32,0.45); }
.btn.ghost{ border-color:var(--line); color:var(--ink); background:var(--surface); }
.btn.ghost:hover{ border-color:var(--blue); color:var(--blue); transform:translateY(-2px); }

/* ---------- NEURAL NETWORK HERO GRAPHIC ---------- */
.signal-wrap{ position:relative; width:100%; max-width:400px; margin:0 auto; opacity:0; animation:rise .9s var(--ease) forwards; animation-delay:.15s; }
.signal-scene{ width:100%; height:auto; display:block; }
.nn-edge{ stroke:var(--line); stroke-width:1; opacity:.8; }
.nn-node{ stroke:var(--line); stroke-width:1.4; }
.nn-node.blue{ fill:var(--blue-dim); }
.nn-node.teal{ fill:var(--teal-dim); }
.nn-node.amber{ fill:var(--amber-dim); }
.nn-node.core{ fill:var(--surface); }
.node-glow{ transform-box: fill-box; transform-origin:50% 50%; animation: nodeGlow 3.2s ease-in-out infinite; }
@keyframes nodeGlow{ 0%,100%{ opacity:.35; transform:scale(1);} 50%{ opacity:1; transform:scale(1.18);} }
.pulse-dot{ filter: drop-shadow(0 0 4px currentColor); }
.pulse-dot.blue{ fill:var(--blue); color:var(--blue); }
.pulse-dot.teal{ fill:var(--teal); color:var(--teal); }
.pulse-dot.amber{ fill:var(--amber); color:var(--amber); }
@media (max-width:820px){
  .hero{ grid-template-columns:1fr; padding-top:64px; }
  .signal-wrap{ max-width:280px; order:-1; }
}
@media (prefers-reduced-motion: reduce){
  .blob,.hero h1,.hero .role,.hero .cta-row,.signal-wrap,.node-glow{ animation:none !important; opacity:1 !important; }
  .pulse-dot{ display:none; }
  html{ scroll-behavior:auto; }
}

/* ---------- SECTION SHELL ---------- */
section{ padding:72px 0; border-top:1px solid var(--line); position:relative; }
.section-badge{ display:inline-flex; align-items:center; gap:7px; padding:6px 14px; border-radius:20px; background:var(--blue-dim); color:var(--blue); font-family:'IBM Plex Mono', monospace; font-size:0.78rem; font-weight:500; margin-bottom:16px; }
.section-badge::before{ content:""; width:6px; height:6px; border-radius:50%; background:var(--blue); }
.section-badge.teal{ background:var(--teal-dim); color:var(--teal); }
.section-badge.teal::before{ background:var(--teal); }
.section-badge.amber{ background:var(--amber-dim); color:var(--amber); }
.section-badge.amber::before{ background:var(--amber); }
section .seg-head{ display:flex; align-items:flex-end; justify-content:space-between; gap:24px; margin-bottom:28px; flex-wrap:wrap; }
section h2{ font-size:1.7rem; max-width:36ch; margin-bottom:8px; }
section .seg-desc{ color:var(--ink-soft); max-width:52ch; margin:0; }
.reveal{ opacity:0; transform:translateY(20px) scale(.99); transition:opacity .7s var(--ease), transform .7s var(--ease); }
.reveal.in{ opacity:1; transform:translateY(0) scale(1); }
@media (prefers-reduced-motion: reduce){ .reveal{ opacity:1; transform:none; transition:none; } }

/* ---------- ABOUT ---------- */
.about-grid{ display:grid; grid-template-columns:220px 1fr; gap:48px; }
.about-grid p{ max-width:64ch; color:var(--ink-soft); }
.about-grid p + p{ margin-top:14px; }
.about-grid .facts{ display:flex; flex-direction:column; gap:14px; font-size:0.9rem; }
.about-grid .facts dt{ color:var(--ink-soft); }
.about-grid .facts dd{ margin:2px 0 0; font-weight:500; }
@media (max-width:700px){ .about-grid{ grid-template-columns:1fr; gap:24px; } }

/* ---------- FILTER CHIPS ---------- */
.filter-row{ display:flex; gap:10px; flex-wrap:wrap; margin-bottom:32px; }
.filter-chip{ padding:9px 17px; border-radius:20px; border:1px solid var(--line); background:var(--surface); font-size:0.85rem; cursor:pointer; transition:all .2s ease; font-family:'IBM Plex Sans', sans-serif; color:var(--ink); }
.filter-chip.active{ background:var(--ink); color:var(--bg); border-color:var(--ink); }
.filter-chip:hover:not(.active){ border-color:var(--blue); color:var(--blue); }

/* ---------- PROJECT CARDS ---------- */
.project-grid{ display:grid; grid-template-columns:repeat(auto-fit, minmax(270px, 1fr)); gap:22px; }
.project{ position:relative; background:var(--surface); border:1px solid var(--line); border-radius:var(--radius); padding:28px; overflow:hidden; transition:transform .3s var(--ease), border-color .3s ease, box-shadow .3s ease, opacity .3s ease; }
.project.wide{ grid-column:1 / -1; }
.project.hidden{ display:none; }
.project:hover{ transform:translateY(-4px); border-color:var(--blue-mid); box-shadow:0 18px 40px -22px rgba(36,81,255,0.28); }
.icon-tile{ width:46px; height:46px; border-radius:10px; display:flex; align-items:center; justify-content:center; margin-bottom:18px; }
.icon-tile svg{ width:24px; height:24px; }
.icon-tile.blue{ background:var(--blue-dim); color:var(--blue); }
.icon-tile.teal{ background:var(--teal-dim); color:var(--teal); }
.icon-tile.amber{ background:var(--amber-dim); color:var(--amber); }
.project h3{ font-size:1.15rem; margin-bottom:5px; }
.project .year{ display:block; color:var(--ink-soft); font-size:0.8rem; margin-bottom:12px; font-family:'IBM Plex Mono', monospace; }
.project p.abstract{ color:var(--ink-soft); max-width:62ch; margin:0 0 16px; }
.tags{ display:flex; flex-wrap:wrap; gap:8px; margin-bottom:18px; }
.tag{ font-family:'IBM Plex Mono', monospace; font-size:0.73rem; padding:4px 10px; border-radius:20px; border:1px solid var(--line); color:var(--ink-soft); transition:border-color .2s ease, color .2s ease; }
.project:hover .tag{ border-color:var(--blue-mid); color:var(--blue); }
.project .links{ display:flex; gap:20px; flex-wrap:wrap; align-items:center; }
.link-arrow{ display:inline-flex; align-items:center; gap:6px; font-size:0.87rem; text-decoration:none; color:var(--ink); font-weight:500; }
.link-arrow svg{ width:14px; height:14px; transition:transform .25s var(--ease); }
.link-arrow:hover{ color:var(--blue); }
.link-arrow:hover svg{ transform:translate(3px,-3px); }

/* ---------- BEFORE/AFTER SLIDER ---------- */
.baf{ margin-top:6px; margin-bottom:18px; }
.baf-frame{ position:relative; width:100%; aspect-ratio:16/9; border-radius:10px; overflow:hidden; background:linear-gradient(135deg, #0d1b3a, #123a3f); cursor:ew-resize; }
.baf-before,.baf-after{ position:absolute; inset:0; background-size:cover; }
.baf-before{ background:repeating-linear-gradient(115deg, rgba(255,255,255,0.05) 0 2px, transparent 2px 6px), linear-gradient(160deg, #3b4048, #565c66 55%, #3b4048); filter:brightness(0.85) saturate(0.35) blur(1.2px); }
.baf-after{ background:repeating-linear-gradient(115deg, rgba(255,255,255,0.05) 0 2px, transparent 2px 6px), linear-gradient(160deg, #0d2f6b, #1c5bd6 55%, #0d2f6b); filter:brightness(1.05) saturate(1.2) contrast(1.1); clip-path:inset(0 50% 0 0); }
.baf-handle{ position:absolute; top:0; bottom:0; left:50%; width:2px; background:#F5F7FA; transform:translateX(-50%); pointer-events:none; }
.baf-handle::after{ content:"↔"; position:absolute; top:50%; left:50%; transform:translate(-50%,-50%); width:30px; height:30px; background:#F5F7FA; color:var(--blue); border-radius:50%; display:flex; align-items:center; justify-content:center; font-size:0.85rem; box-shadow:0 2px 8px rgba(0,0,0,0.25); }
.baf-range{ position:absolute; inset:0; width:100%; height:100%; opacity:0; margin:0; cursor:ew-resize; }
.baf-caption{ margin-top:8px; font-size:0.82rem; color:var(--ink-soft); }
.baf-label{ position:absolute; bottom:8px; font-family:'IBM Plex Mono', monospace; font-size:0.66rem; letter-spacing:0.03em; color:rgba(245,247,250,0.9); background:rgba(0,0,0,0.3); padding:2px 8px; border-radius:12px; }
.baf-label.l{ left:8px; } .baf-label.r{ right:8px; }

/* ---------- PUBLICATIONS ---------- */
.pub-list{ list-style:none; margin:0; padding:0; }
.pub-list li{ padding:18px 0; border-top:1px solid var(--line); display:grid; grid-template-columns:20px 1fr auto; gap:14px; align-items:baseline; transition:padding-left .25s var(--ease); }
.pub-list li:hover{ padding-left:6px; }
.pub-list li:first-child{ border-top:none; }
.pub-bullet{ width:8px; height:8px; align-self:center; }
.pub-bullet svg{ width:100%; height:100%; }
.pub-list .pub-title{ font-weight:500; }
.pub-list .pub-meta{ display:block; color:var(--ink-soft); font-size:0.86rem; margin-top:3px; font-family:'IBM Plex Mono', monospace; }
.pub-list .pub-link{ font-size:0.85rem; color:var(--blue); text-decoration:none; white-space:nowrap; }

/* ---------- CONTACT ---------- */
.contact{ display:flex; justify-content:space-between; align-items:flex-end; flex-wrap:wrap; gap:28px; }
.contact .big{ font-size:clamp(1.5rem, 3vw, 2.15rem); max-width:20ch; }
.contact .channels{ display:flex; flex-direction:column; gap:12px; }
.contact .channels a{ display:flex; align-items:center; gap:10px; justify-content:flex-end; text-decoration:none; font-size:0.95rem; color:var(--ink-soft); transition:color .2s ease, transform .2s ease; }
.contact .channels a svg{ width:17px; height:17px; transition:transform .2s var(--ease); }
.contact .channels a:hover{ color:var(--ink); transform:translateX(-2px); }
.contact .channels a:hover svg{ transform:scale(1.12); color:var(--blue); }

footer{ padding:30px 0 44px; color:var(--ink-soft); font-size:0.82rem; font-family:'IBM Plex Mono', monospace; }
:focus-visible{ outline:2px solid var(--blue); outline-offset:2px; }

/* ---------- BLOG LIST ---------- */
.blog-grid{ display:grid; grid-template-columns:repeat(auto-fit, minmax(280px,1fr)); gap:22px; }
.blog-card{ display:block; text-decoration:none; color:var(--ink); background:var(--surface); border:1px solid var(--line); border-radius:var(--radius); padding:26px; transition:transform .3s var(--ease), border-color .3s ease, box-shadow .3s ease; }
.blog-card:hover{ transform:translateY(-4px); border-color:var(--teal-mid); box-shadow:0 18px 40px -22px rgba(14,168,148,0.28); }
.blog-card .blog-meta{ font-family:'IBM Plex Mono', monospace; font-size:0.78rem; color:var(--ink-soft); margin-bottom:10px; }
.blog-card h3{ font-size:1.1rem; margin-bottom:8px; }
.blog-card p{ color:var(--ink-soft); font-size:0.92rem; margin:0 0 14px; }
.blog-card .read-more{ font-size:0.85rem; font-weight:500; color:var(--teal); display:inline-flex; align-items:center; gap:6px; }
.blog-card .read-more svg{ width:13px; height:13px; transition:transform .25s var(--ease); }
.blog-card:hover .read-more svg{ transform:translate(3px,-3px); }

/* ---------- ARTICLE / DETAIL PAGES ---------- */
.page-hero{ padding:56px 0 40px; border-top:none; }
.back-link{ display:inline-flex; align-items:center; gap:6px; font-size:0.88rem; color:var(--ink-soft); text-decoration:none; margin-bottom:24px; }
.back-link svg{ width:14px; height:14px; }
.back-link:hover{ color:var(--blue); }
.page-hero .badge-row{ display:flex; gap:8px; margin-bottom:18px; flex-wrap:wrap; }
.badge-row .section-badge{ margin-bottom:0; }
.page-hero h1{ font-size:clamp(1.9rem,4vw,2.7rem); line-height:1.15; max-width:26ch; margin-bottom:16px; }
.page-hero .meta{ color:var(--ink-soft); font-size:0.95rem; font-family:'IBM Plex Mono', monospace; }
article.prose{ max-width:72ch; }
article.prose p{ color:var(--ink-soft); margin:0 0 20px; }
article.prose h2{ font-size:1.35rem; margin:40px 0 14px; color:var(--ink); }
article.prose h3{ font-size:1.05rem; margin:26px 0 8px; color:var(--ink); }
article.prose ul{ color:var(--ink-soft); padding-left:20px; margin:0 0 20px; }
article.prose li{ margin-bottom:8px; }
.callout{ background:var(--teal-dim); border-left:3px solid var(--teal); padding:16px 22px; border-radius:8px; font-weight:500; margin:28px 0; color:var(--ink); }
.callout.blue{ background:var(--blue-dim); border-left-color:var(--blue); }
.callout.amber{ background:var(--amber-dim); border-left-color:var(--amber); }
.callout .q{ font-style:italic; font-weight:500; }
.detail-icon{ width:64px; height:64px; border-radius:14px; display:flex; align-items:center; justify-content:center; margin-bottom:24px; }
.detail-icon svg{ width:32px; height:32px; }
.stat-row{ display:grid; grid-template-columns:repeat(auto-fit, minmax(150px,1fr)); gap:20px; margin:32px 0 40px; padding:24px 0; border-top:1px solid var(--line); border-bottom:1px solid var(--line); }
.stat-row .stat .num{ font-family:'Space Grotesk', sans-serif; font-size:1.35rem; font-weight:600; }
.stat-row .stat .lbl{ font-size:0.82rem; color:var(--ink-soft); margin-top:2px; }