/* ============================================================
   Usman Ali — Portfolio
   Editorial dark/light system: ink + paper, emerald + copper duotone
   ============================================================ */

:root{
  --ink:#ffffff;
  --ink-soft:#ffffff;
  --ink-elev:#ffffff;
  --text:#181c1a;
  --text-dim:#4b544e;
  --text-faint:#767f78;
  --line:rgba(24,28,26,0.10);
  --line-strong:rgba(24,28,26,0.17);
  --emerald:#1c8a63;
  --emerald-deep:#146849;
  --copper:#b8712f;
  --copper-deep:#8a521c;
  --shadow: 0 30px 60px -30px rgba(30,26,14,0.18);
  --radius: 14px;
  --font-display:"Fraunces", Georgia, serif;
  --font-body:"Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono:"IBM Plex Mono", ui-monospace, Menlo, monospace;
  --maxw: 1180px;
  color-scheme: light;
}

:root[data-theme="dark"]{
  --ink:#0b0f0e;
  --ink-soft:#111815;
  --ink-elev:#161f1b;
  --text:#ece8dd;
  --text-dim:#9fa89f;
  --text-faint:#6d766e;
  --line:rgba(236,232,221,0.10);
  --line-strong:rgba(236,232,221,0.18);
  --emerald:#33c690;
  --emerald-deep:#1f8f68;
  --copper:#e2954d;
  --copper-deep:#b8712f;
  --shadow: 0 30px 60px -30px rgba(0,0,0,0.6);
  color-scheme: dark;
}

*,*::before,*::after{box-sizing:border-box;}
.focus-grid > *, .edu-grid > *, .proj-grid > *, .skills-grid > *, .award-grid > *, .pub-card > *{min-width:0;}
html{scroll-behavior:smooth;}
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{animation-duration:0.01ms !important;animation-iteration-count:1 !important;transition-duration:0.01ms !important;scroll-behavior:auto !important;}
}

body{
  margin:0;
  background:var(--ink);
  color:var(--text);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
  transition:background .4s ease, color .4s ease;
}

body::before{
  content:"";
  position:fixed;
  inset:0;
  pointer-events:none;
  z-index:0;
  background-image:radial-gradient(circle at 1px 1px, rgba(0,0,0,0.045) 1px, transparent 0);
  background-size:34px 34px;
  opacity:.5;
}
:root[data-theme="dark"] body::before{
  background-image:radial-gradient(circle at 1px 1px, rgba(255,255,255,0.035) 1px, transparent 0);
}

img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
ul{margin:0;padding:0;list-style:none;}
h1,h2,h3,h4{margin:0;font-family:var(--font-display);font-weight:600;letter-spacing:-0.01em;}
p{margin:0;}
button{font-family:inherit;cursor:pointer;}

.wrap{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 clamp(20px,5vw,56px);position:relative;z-index:1;}

.eyebrow{
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--emerald);
  display:flex;
  align-items:center;
  gap:10px;
}
.eyebrow::before{
  content:"";
  width:22px;height:1px;
  background:var(--emerald);
  display:inline-block;
}

.section-head{margin-bottom:44px;max-width:640px;}
.section-head h2{font-size:clamp(28px,4vw,42px);margin-top:14px;}
.section-head .lede{margin-top:14px;color:var(--text-dim);font-size:16.5px;max-width:56ch;}

section{position:relative;padding:118px 0;border-top:1px solid var(--line);}
section#home{border-top:none;}

/* ---------- Reveal on scroll ---------- */
.reveal{opacity:0;transform:translateY(26px);transition:opacity .8s cubic-bezier(.16,1,.3,1), transform .8s cubic-bezier(.16,1,.3,1);}
.reveal.in{opacity:1;transform:translateY(0);}
.reveal-stagger > *{opacity:0;transform:translateY(20px);transition:opacity .7s cubic-bezier(.16,1,.3,1), transform .7s cubic-bezier(.16,1,.3,1);}
.reveal-stagger.in > *{opacity:1;transform:translateY(0);}
.reveal-stagger.in > *:nth-child(1){transition-delay:.02s;}
.reveal-stagger.in > *:nth-child(2){transition-delay:.09s;}
.reveal-stagger.in > *:nth-child(3){transition-delay:.16s;}
.reveal-stagger.in > *:nth-child(4){transition-delay:.23s;}
.reveal-stagger.in > *:nth-child(5){transition-delay:.30s;}
.reveal-stagger.in > *:nth-child(6){transition-delay:.37s;}
.reveal-stagger.in > *:nth-child(7){transition-delay:.44s;}
.reveal-stagger.in > *:nth-child(8){transition-delay:.51s;}

/* ---------- Top Nav ---------- */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:100;
  padding:18px clamp(20px,5vw,56px);
  display:flex;align-items:center;justify-content:space-between;
  transition:background .35s ease, border-color .35s ease, padding .35s ease, backdrop-filter .35s ease;
  border-bottom:1px solid transparent;
}
.nav.scrolled{
  background:color-mix(in srgb, var(--ink) 82%, transparent);
  backdrop-filter:blur(14px) saturate(140%);
  border-bottom:1px solid var(--line);
  padding-top:12px;padding-bottom:12px;
}
.brand{
  display:flex;align-items:center;gap:11px;
  font-family:var(--font-mono);font-size:14px;letter-spacing:.04em;
}
.brand-mark{
  width:38px;height:38px;border-radius:50%;
  display:grid;place-items:center;
  position:relative;
}
.brand-mark svg{width:100%;height:100%;overflow:visible;}
.brand-mark .brand-node{animation:pulse 3s ease-in-out infinite;transform-origin:center;transform-box:fill-box;}
.brand-mark::after{
  content:"";position:absolute;inset:-4px;border-radius:50%;
  border:1px dashed var(--line-strong);opacity:.5;
  animation:spin-slow 18s linear infinite;
}
@keyframes spin-slow{to{transform:rotate(360deg);}}
.nav-links{display:flex;gap:30px;align-items:center;}
.nav-links a{
  font-size:13.5px;color:var(--text-dim);position:relative;padding:4px 0;
  transition:color .25s ease;
}
.nav-links a::after{
  content:"";position:absolute;left:0;bottom:0;height:1px;width:0;
  background:var(--emerald);transition:width .3s cubic-bezier(.16,1,.3,1);
}
.nav-links a:hover,.nav-links a.active{color:var(--text);}
.nav-links a:hover::after,.nav-links a.active::after{width:100%;}
.nav-actions{display:flex;align-items:center;gap:12px;}
.icon-btn{
  width:38px;height:38px;border-radius:50%;
  border:1px solid var(--line-strong);
  background:transparent;color:var(--text);
  display:grid;place-items:center;
  transition:border-color .25s ease, transform .25s ease, background .25s ease;
}
.icon-btn:hover{border-color:var(--emerald);transform:translateY(-2px);}
.icon-btn svg{width:17px;height:17px;}
.btn-ghost-nav{
  font-size:13px;padding:9px 18px;border-radius:100px;
  border:1px solid var(--line-strong);color:var(--text);
  white-space:nowrap;
  transition:border-color .25s ease, background .25s ease;
  display:none;
}
.btn-ghost-nav:hover{border-color:var(--emerald);background:rgba(51,198,144,.08);}
.nav-burger{display:none;width:38px;height:38px;border-radius:50%;border:1px solid var(--line-strong);background:transparent;place-items:center;color:var(--text);}
.nav-burger svg{width:18px;height:18px;}

/* ---------- Search palette ---------- */
.search-overlay{
  position:fixed;inset:0;z-index:200;
  background:rgba(10,14,12,.55);backdrop-filter:blur(4px);
  display:flex;align-items:flex-start;justify-content:center;
  padding:14vh 20px 20px;
  opacity:0;pointer-events:none;
  transition:opacity .25s ease;
}
.search-overlay.open{opacity:1;pointer-events:auto;}
.search-box{
  width:100%;max-width:560px;background:var(--ink-elev);
  border:1px solid var(--line-strong);border-radius:16px;
  box-shadow:0 40px 80px -20px rgba(0,0,0,.45);
  overflow:hidden;
  transform:translateY(-16px);transition:transform .3s cubic-bezier(.16,1,.3,1);
}
.search-overlay.open .search-box{transform:translateY(0);}
.search-input-row{
  display:flex;align-items:center;gap:12px;padding:16px 20px;
  border-bottom:1px solid var(--line);
}
.search-input-row svg{width:18px;height:18px;color:var(--text-faint);flex-shrink:0;}
.search-input-row input{
  flex:1;border:none;background:transparent;outline:none;
  font-family:var(--font-body);font-size:16px;color:var(--text);
}
.search-input-row input::placeholder{color:var(--text-faint);}
.search-input-row kbd{
  font-family:var(--font-mono);font-size:11px;color:var(--text-faint);
  border:1px solid var(--line-strong);border-radius:5px;padding:2px 6px;
}
.search-results{max-height:50vh;overflow-y:auto;padding:8px;}
.search-result{
  display:flex;flex-direction:column;gap:2px;
  padding:11px 14px;border-radius:10px;cursor:pointer;
  transition:background .15s ease;
}
.search-result:hover, .search-result.active{background:var(--ink-soft);}
.search-result b{font-size:14px;color:var(--text);font-weight:600;}
.search-result span{font-family:var(--font-mono);font-size:11px;color:var(--text-faint);text-transform:uppercase;letter-spacing:.04em;}
.search-empty{padding:24px 14px;text-align:center;color:var(--text-faint);font-size:13.5px;}

/* ---------- Mobile nav ---------- */
.mobile-panel{
  position:fixed;inset:0;z-index:99;background:var(--ink);
  display:flex;flex-direction:column;justify-content:center;gap:22px;padding:32px;
  transform:translateY(-100%);transition:transform .5s cubic-bezier(.16,1,.3,1);
}
.mobile-panel.open{transform:translateY(0);}
.mobile-panel a{font-family:var(--font-display);font-size:30px;color:var(--text);}

/* ---------- Side dot nav ---------- */
.dotnav{
  position:fixed;right:26px;top:50%;transform:translateY(-50%);
  z-index:90;display:flex;flex-direction:column;gap:16px;
}
.dotnav a{
  width:9px;height:9px;border-radius:50%;
  border:1px solid var(--line-strong);
  position:relative;display:block;
  transition:background .25s ease, border-color .25s ease, transform .25s ease;
}
.dotnav a.active{background:var(--emerald);border-color:var(--emerald);transform:scale(1.3);}
.dotnav a span{
  position:absolute;right:20px;top:50%;transform:translateY(-50%);
  font-family:var(--font-mono);font-size:11px;white-space:nowrap;
  color:var(--text-dim);opacity:0;transition:opacity .25s ease;
}
.dotnav a:hover span{opacity:1;}
@media (max-width: 980px){.dotnav{display:none;}}

/* ============================================================
   HERO
   ============================================================ */
#home{
  min-height:100svh;display:flex;flex-direction:column;justify-content:center;
  padding-top:140px;padding-bottom:0;
  --mx:50%;--my:30%;
  position:relative;
}
#home::after{
  content:"";position:absolute;inset:0;z-index:0;pointer-events:none;
  background:radial-gradient(480px circle at var(--mx) var(--my), color-mix(in srgb, var(--emerald) 7%, transparent), transparent 70%);
  transition:background .3s ease;
}
#home > *{position:relative;z-index:1;}
.hero-grid{
  display:grid;grid-template-columns:1.15fr 0.85fr;gap:40px;align-items:center;
}
.hero-grid > *{min-width:0;}
.hero-kicker{
  display:inline-flex;align-items:center;gap:9px;
  font-family:var(--font-mono);font-size:12.5px;letter-spacing:.12em;
  color:var(--text-dim);border:1px solid var(--line-strong);
  padding:7px 14px;border-radius:100px;margin-bottom:26px;
}
.hero-kicker .dot{width:7px;height:7px;border-radius:50%;background:var(--emerald);box-shadow:0 0 0 3px rgba(51,198,144,.18);}
.hero h1{
  font-size:clamp(40px,6.4vw,74px);
  line-height:1.03;
  color:var(--text);
}
.hero h1 em{font-style:italic;color:var(--emerald);font-weight:500;}
.hero-role{
  margin-top:22px;font-family:var(--font-mono);font-size:clamp(15px,1.9vw,19px);
  color:var(--copper);min-height:26px;display:flex;align-items:center;gap:10px;
}
.hero-role .cursor{width:2px;height:1em;background:var(--copper);animation:blink 1s step-end infinite;}
@keyframes blink{50%{opacity:0;}}
.hero-desc{margin-top:26px;max-width:52ch;color:var(--text-dim);font-size:17px;line-height:1.75;}
.hero-cta{display:flex;flex-wrap:wrap;gap:14px;margin-top:38px;}

.btn{
  --btn-fg:var(--ink);
  display:inline-flex;align-items:center;gap:9px;
  padding:14px 26px;border-radius:100px;
  font-size:14px;font-weight:600;letter-spacing:.01em;
  background:var(--emerald);color:#08110d;
  border:1px solid var(--emerald);
  transition:transform .3s cubic-bezier(.16,1,.3,1), box-shadow .3s ease, background .3s ease;
  position:relative;overflow:hidden;
}
.btn:hover{transform:translateY(-3px);box-shadow:0 16px 30px -14px rgba(51,198,144,.55);}
.btn svg{width:15px;height:15px;transition:transform .3s ease;}
.btn:hover svg{transform:translate(2px,-2px);}
.btn.outline{background:transparent;color:var(--text);border-color:var(--line-strong);}
.btn.outline:hover{border-color:var(--copper);box-shadow:0 16px 30px -18px rgba(226,149,77,.45);}

.hero-stats{display:flex;gap:34px;margin-top:56px;flex-wrap:wrap;}
.stat b{
  display:block;font-family:var(--font-display);font-size:clamp(26px,3vw,34px);color:var(--text);
}
.stat span{font-family:var(--font-mono);font-size:11.5px;letter-spacing:.06em;color:var(--text-faint);text-transform:uppercase;}

/* Hero visual: portrait + knowledge-graph motif */
.hero-art{position:relative;width:100%;max-width:400px;aspect-ratio:1;margin:0 auto;}
.orbit-svg{position:absolute;inset:0;width:100%;height:100%;overflow:visible;}
.hero-art .draw{
  stroke-dasharray:260;stroke-dashoffset:260;
  animation:draw 2s cubic-bezier(.16,1,.3,1) forwards .3s;
}
@keyframes draw{to{stroke-dashoffset:0;}}
.hero-art .node{animation:pulse 3.2s ease-in-out infinite;transform-origin:center;transform-box:fill-box;}
.hero-art .node:nth-child(odd){animation-delay:.6s;}
@keyframes pulse{0%,100%{opacity:.55;transform:scale(1);}50%{opacity:1;transform:scale(1.35);}}
.hero-art .orbit{animation:spin-slow 50s linear infinite;transform-origin:center;transform-box:fill-box;}

.hero-photo-wrap{
  position:absolute;inset:13%;border-radius:50%;overflow:hidden;
  border:2px solid var(--emerald);
  box-shadow:0 0 0 12px rgba(51,198,144,.07), 0 30px 60px -20px rgba(0,0,0,.55);
  background:var(--ink-elev);
  animation:fade-in-scale 1s cubic-bezier(.16,1,.3,1) both .2s;
}
@keyframes fade-in-scale{from{opacity:0;transform:scale(.92);}to{opacity:1;transform:scale(1);}}
.hero-photo{width:100%;height:100%;object-fit:cover;filter:saturate(1.03) contrast(1.03);}

.float-badge{
  position:absolute;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.02em;
  padding:8px 14px;border-radius:100px;
  background:var(--ink-elev);border:1px solid var(--line-strong);
  color:var(--text);box-shadow:var(--shadow);
  animation:bob 5s ease-in-out infinite;
  white-space:nowrap;
}
.float-badge.fb1{top:2%;left:-6%;animation-delay:0s;}
.float-badge.fb2{bottom:10%;right:-8%;animation-delay:1.2s;}
.float-badge.fb3{bottom:-2%;left:6%;animation-delay:2.4s;}
@keyframes bob{0%,100%{transform:translateY(0);}50%{transform:translateY(-8px);}}

@media (max-width:980px){
  .float-badge{font-size:10.5px;padding:6px 12px;}
  .float-badge.fb1{left:0;}
  .float-badge.fb2{right:0;}
}
@media (max-width:460px){
  .float-badge{display:none;}
}

@media (max-width:980px){
  .hero-grid{grid-template-columns:1fr;}
  .hero-art{order:-1;max-width:280px;margin:0 auto 20px;}
}

/* ============================================================
   ABOUT
   ============================================================ */
.about-grid{display:grid;grid-template-columns:0.9fr 1.1fr;gap:64px;align-items:start;}
.about-grid > *{min-width:0;}
.about-lead{font-family:var(--font-display);font-size:clamp(21px,2.4vw,27px);line-height:1.5;color:var(--text);}
.about-lead .accent{color:var(--emerald);}
.about-body{margin-top:24px;color:var(--text-dim);font-size:16px;line-height:1.85;}
.chip-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:30px;}
.chip{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.03em;
  padding:9px 14px;border-radius:100px;border:1px solid var(--line-strong);
  color:var(--text-dim);transition:all .25s ease;
}
.chip:hover{border-color:var(--emerald);color:var(--text);background:rgba(51,198,144,.06);}

.about-card{
  border:1px solid var(--line);border-radius:var(--radius);
  padding:30px;background:var(--ink-soft);
}
.about-card h4{font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;text-transform:uppercase;color:var(--text-faint);margin-bottom:18px;}
.mini-fact{display:flex;justify-content:space-between;gap:12px;padding:13px 0;border-top:1px solid var(--line);font-size:14.5px;}
.mini-fact:first-of-type{border-top:none;}
.mini-fact span:first-child{color:var(--text-faint);}
.mini-fact span:last-child{color:var(--text);text-align:right;}

/* ============================================================
   ADVANCED AI EXPERTISE (chip cloud)
   ============================================================ */
.ai-cloud{display:flex;flex-wrap:wrap;gap:12px;}
.ai-pill{
  font-family:var(--font-mono);font-size:13px;letter-spacing:.01em;
  padding:12px 20px;border-radius:100px;
  border:1px solid var(--line-strong);color:var(--text);
  background:var(--ink-soft);
  display:inline-flex;align-items:center;gap:8px;
  transition:transform .35s cubic-bezier(.16,1,.3,1), border-color .3s ease, background .3s ease, box-shadow .3s ease;
  position:relative;
}
.ai-pill::before{
  content:"";width:6px;height:6px;border-radius:50%;
  background:var(--emerald);flex-shrink:0;
}
.ai-pill.lg{
  font-weight:600;color:var(--emerald);border-color:var(--emerald);
  background:color-mix(in srgb, var(--emerald) 9%, var(--ink-soft));
}
.ai-pill:hover{
  transform:translateY(-4px) scale(1.03);
  border-color:var(--emerald);
  box-shadow:0 14px 26px -16px rgba(14,143,97,.35);
}
@media (max-width:640px){
  .ai-pill{font-size:12px;padding:10px 16px;}
}

/* ============================================================
   RESEARCH FOCUS CARDS
   ============================================================ */
.focus-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;}
.focus-card{
  border:1px solid var(--line);border-radius:var(--radius);
  padding:30px 26px;background:var(--ink-soft);
  transition:transform .4s cubic-bezier(.16,1,.3,1), border-color .4s ease, background .4s ease;
  position:relative;overflow:hidden;
}
.focus-card::before{
  content:"";position:absolute;inset:0;opacity:0;
  background:radial-gradient(180px circle at 30px 20px, rgba(51,198,144,.14), transparent 70%);
  transition:opacity .4s ease;
}
.focus-card:hover{transform:translateY(-8px);border-color:var(--line-strong);}
.focus-card:hover::before{opacity:1;}
.focus-icon{
  width:46px;height:46px;border-radius:12px;
  display:grid;place-items:center;margin-bottom:22px;
  background:linear-gradient(135deg, rgba(51,198,144,.16), rgba(226,149,77,.10));
  border:1px solid var(--line-strong);color:var(--emerald);
}
.focus-icon svg{width:22px;height:22px;}
.focus-card h3{font-size:18.5px;margin-bottom:10px;position:relative;}
.focus-card p{font-size:14px;color:var(--text-dim);line-height:1.7;position:relative;}
@media (max-width:980px){.focus-grid{grid-template-columns:1fr 1fr;}}
@media (max-width:620px){.focus-grid{grid-template-columns:1fr;}}

/* ============================================================
   EXPERIENCE TIMELINE
   ============================================================ */
.timeline{position:relative;margin-top:10px;}
.timeline::before{
  content:"";position:absolute;left:9px;top:6px;bottom:6px;width:1px;
  background:var(--line-strong);
}
.timeline-fill{
  position:absolute;left:9px;top:6px;width:1px;background:var(--emerald);
  height:0%;transition:height .3s ease-out;
}
.t-item{position:relative;padding-left:42px;padding-bottom:44px;}
.t-item:last-child{padding-bottom:0;}
.t-dot{
  position:absolute;left:0;top:4px;width:19px;height:19px;border-radius:50%;
  background:var(--ink);border:1px solid var(--line-strong);
  display:grid;place-items:center;
}
.t-dot::after{content:"";width:7px;height:7px;border-radius:50%;background:var(--text-faint);transition:background .3s ease;}
.t-item.in .t-dot::after{background:var(--emerald);}
.t-head{display:flex;flex-wrap:wrap;align-items:baseline;gap:10px 16px;}
.t-head h3{font-size:19px;}
.t-org{color:var(--copper);font-size:14.5px;font-weight:500;}
.t-date{margin-left:auto;font-family:var(--font-mono);font-size:12px;color:var(--text-faint);}
.t-tag{
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.06em;text-transform:uppercase;
  padding:3px 9px;border-radius:100px;border:1px solid var(--line-strong);color:var(--text-faint);
}
.t-tag.academia{color:var(--emerald);border-color:rgba(51,198,144,.4);}
.t-tag.industry{color:var(--copper);border-color:rgba(226,149,77,.4);}
.t-list{margin-top:12px;color:var(--text-dim);font-size:14.5px;line-height:1.85;}
.t-list li{padding-left:16px;position:relative;}
.t-list li::before{content:"—";position:absolute;left:0;color:var(--text-faint);}

.show-more-wrap{margin-top:36px;}
#earlier-roles{
  max-height:0;overflow:hidden;
  transition:max-height .6s cubic-bezier(.16,1,.3,1);
}
#earlier-roles.open{max-height:2200px;}
.toggle-btn{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:12.5px;letter-spacing:.04em;
  color:var(--text-dim);background:transparent;border:1px solid var(--line-strong);
  padding:11px 18px;border-radius:100px;transition:all .25s ease;
}
.toggle-btn:hover{border-color:var(--emerald);color:var(--text);}
.toggle-btn svg{width:13px;height:13px;transition:transform .3s ease;}
.toggle-btn.open svg{transform:rotate(180deg);}

/* ============================================================
   EDUCATION
   ============================================================ */
.edu-grid{display:grid;grid-template-columns:1fr 1fr;gap:22px;}
.edu-card{border:1px solid var(--line);border-radius:var(--radius);padding:30px;background:var(--ink-soft);}
.edu-card .t-date{margin-left:0;display:block;margin-top:6px;}
.edu-card h3{font-size:19px;margin-top:14px;}
.edu-card .t-org{display:block;margin-top:4px;}
.edu-card ul{margin-top:16px;color:var(--text-dim);font-size:14px;line-height:1.8;}
.edu-card ul li{padding-left:16px;position:relative;}
.edu-card ul li::before{content:"—";position:absolute;left:0;color:var(--text-faint);}
@media (max-width:760px){.edu-grid{grid-template-columns:1fr;}}

/* ============================================================
   PUBLICATIONS
   ============================================================ */
.pub-list{display:flex;flex-direction:column;gap:16px;}
.pub-card{
  border:1px solid var(--line);border-radius:var(--radius);
  padding:26px 28px;background:var(--ink-soft);
  display:grid;grid-template-columns:auto 1fr auto;gap:22px;align-items:center;
  transition:border-color .3s ease, transform .3s ease;
}
.pub-card:hover{border-color:var(--line-strong);transform:translateX(4px);}
.pub-year{
  font-family:var(--font-mono);font-size:13px;color:var(--text-faint);
  writing-mode:horizontal-tb;
}
.pub-body h3{font-size:17px;line-height:1.4;font-weight:600;font-family:var(--font-body);}
.pub-authors{font-size:13.5px;color:var(--text-dim);margin-top:8px;}
.pub-authors b{color:var(--text);font-weight:600;}
.pub-venue{font-family:var(--font-mono);font-size:12px;color:var(--text-faint);margin-top:8px;}
.pub-badges{display:flex;gap:8px;margin-top:10px;flex-wrap:wrap;}
.badge{
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.05em;text-transform:uppercase;
  padding:4px 10px;border-radius:100px;
}
.badge.hot{background:rgba(226,149,77,.14);color:var(--copper);border:1px solid rgba(226,149,77,.35);}
.badge.first{background:rgba(51,198,144,.14);color:var(--emerald);border:1px solid rgba(51,198,144,.35);}
.pub-cite{text-align:right;}
.pub-cite b{display:block;font-family:var(--font-display);font-size:24px;color:var(--text);}
.pub-cite span{font-family:var(--font-mono);font-size:10px;color:var(--text-faint);text-transform:uppercase;letter-spacing:.05em;}
@media (max-width:760px){
  .pub-card{grid-template-columns:1fr;}
  .pub-cite{text-align:left;}
}

/* ============================================================
   PROJECTS
   ============================================================ */
.proj-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:22px;}
.proj-card{
  border:1px solid var(--line);border-radius:var(--radius);
  padding:32px;background:var(--ink-soft);position:relative;overflow:hidden;
  transition:transform .4s cubic-bezier(.16,1,.3,1), border-color .3s ease;
}
.proj-card:hover{transform:translateY(-6px);border-color:var(--line-strong);}
.proj-tag{font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:var(--copper);}
.proj-card h3{font-size:21px;margin-top:14px;}
.proj-card p{margin-top:12px;color:var(--text-dim);font-size:14.5px;line-height:1.75;}
.proj-meta{margin-top:18px;display:flex;gap:10px;flex-wrap:wrap;}
@media (max-width:760px){.proj-grid{grid-template-columns:1fr;}}

/* ============================================================
   SKILLS
   ============================================================ */
.skills-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:34px 50px;}
.skill-group h4{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;text-transform:uppercase;
  color:var(--text-faint);margin-bottom:16px;
}
.skill-group .chip-row{margin-top:0;}
@media (max-width:760px){.skills-grid{grid-template-columns:1fr;}}

/* ============================================================
   AWARDS / CERTS
   ============================================================ */
.award-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;}
.award-card{
  border:1px solid var(--line);border-radius:var(--radius);
  padding:26px;background:var(--ink-soft);
  transition:transform .35s ease, border-color .3s ease;
}
.award-card:hover{transform:translateY(-5px);border-color:var(--line-strong);}
.award-icon{width:36px;height:36px;color:var(--copper);margin-bottom:16px;}
.award-icon svg{width:100%;height:100%;}
.award-card h4{font-size:15.5px;line-height:1.4;font-family:var(--font-body);font-weight:600;}
.award-card p{margin-top:8px;font-size:13px;color:var(--text-faint);}
@media (max-width:900px){.award-grid{grid-template-columns:1fr 1fr;}}
@media (max-width:560px){.award-grid{grid-template-columns:1fr;}}

/* ============================================================
   CONTACT
   ============================================================ */
#contact{padding-bottom:60px;}
.contact-wrap{
  border:1px solid var(--line);border-radius:24px;
  padding:clamp(36px,6vw,72px);background:var(--ink-soft);
  position:relative;overflow:hidden;text-align:center;
}
.contact-wrap::before{
  content:"";position:absolute;inset:0;
  background:radial-gradient(600px circle at 50% 0%, rgba(51,198,144,.12), transparent 60%);
  pointer-events:none;
}
.contact-wrap h2{font-size:clamp(30px,5vw,50px);position:relative;max-width:20ch;margin:0 auto;}
.contact-wrap .lede{margin:18px auto 0;color:var(--text-dim);max-width:52ch;position:relative;}
.contact-actions{display:flex;justify-content:center;gap:14px;flex-wrap:wrap;margin-top:38px;position:relative;}
.contact-links{display:flex;justify-content:center;gap:26px;flex-wrap:wrap;margin-top:46px;position:relative;}
.contact-links a{
  display:flex;align-items:center;gap:9px;font-family:var(--font-mono);font-size:13px;color:var(--text-dim);
  transition:color .25s ease;
}
.contact-links a:hover{color:var(--emerald);}
.contact-links svg{width:16px;height:16px;}

/* ---------- Footer ---------- */
footer{padding:36px 0;}
.footer-row{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:14px;}
.footer-row p{font-size:12.5px;color:var(--text-faint);font-family:var(--font-mono);}
.back-top{
  width:40px;height:40px;border-radius:50%;border:1px solid var(--line-strong);
  display:grid;place-items:center;transition:transform .3s ease, border-color .3s ease;
}
.back-top:hover{transform:translateY(-4px);border-color:var(--emerald);}
.back-top svg{width:15px;height:15px;}

/* ---------- Marquee (skills strip under hero) ---------- */
.marquee{
  border-top:1px solid var(--line);border-bottom:1px solid var(--line);
  overflow:hidden;padding:16px 0;margin-top:70px;
}
.marquee-track{
  display:flex;gap:48px;white-space:nowrap;width:max-content;
  animation:scroll-x 34s linear infinite;
}
.marquee:hover .marquee-track{animation-play-state:paused;}
.marquee-track span{
  font-family:var(--font-mono);font-size:12.5px;color:var(--text-faint);
  display:flex;align-items:center;gap:10px;
}
.marquee-track span::before{content:"◆";color:var(--emerald);font-size:8px;}
@keyframes scroll-x{from{transform:translateX(0);}to{transform:translateX(-50%);}}

/* ---------- Responsive: nav & general ---------- */
@media (max-width:980px){
  .nav-links{display:none;}
  .nav-burger{display:grid;}
  .btn-ghost-nav{display:none;}
  .about-grid{grid-template-columns:1fr;gap:36px;}
}
@media (min-width:981px){
  .btn-ghost-nav{display:inline-flex;}
}
@media (max-width:640px){
  section{padding:80px 0;}
  .hero-stats{gap:22px;}
  .pub-card{padding:22px;}
}

::selection{background:var(--emerald);color:#08110d;}

.scroll-progress{
  position:fixed;top:0;left:0;height:2px;background:linear-gradient(90deg,var(--emerald),var(--copper));
  width:0%;z-index:200;transition:width .1s linear;
}