/* ───────────────────────────────────────────────────────────────
   barisgunaydin.com
   no frameworks, no preprocessor, no build step. just css.
   ─────────────────────────────────────────────────────────────── */

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",system-ui,"Helvetica Neue",Arial,sans-serif;
  background:#07070a;
  color:#fafafa;
  line-height:1.55;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  overflow-x:hidden;
  min-height:100vh;
  font-feature-settings:"ss01","cv11";
}
img,svg{max-width:100%;display:block}
a{color:inherit;text-decoration:none;transition:color .18s ease,opacity .18s ease}
a:hover{color:#fcd34d}
button{font:inherit;color:inherit;background:none;border:none;cursor:pointer}
em{font-style:italic;color:#fcd34d}
code{font-family:ui-monospace,"SF Mono",Menlo,Consolas,monospace;font-size:.92em;background:rgba(245,158,11,.1);color:#fcd34d;padding:.1em .4em;border-radius:4px}
b,strong{font-weight:700}
.nobr{white-space:nowrap}
.inline-link{color:#f59e0b;font-weight:500;font-size:.82em;margin-left:.3em;letter-spacing:.01em;text-transform:none}
.inline-link:hover{color:#fcd34d}

:root{
  --bg:#07070a;
  --card:rgba(255,255,255,.024);
  --card-hover:rgba(255,255,255,.045);
  --border:rgba(255,255,255,.07);
  --border-hover:rgba(245,158,11,.35);
  --text:#fafafa;
  --muted:#a1a1aa;
  --dim:#71717a;
  --faint:#3f3f46;
  --amber:#f59e0b;
  --amber-2:#f97316;
  --amber-glow:rgba(245,158,11,.6);
  --gradient:linear-gradient(135deg,#f59e0b 0%,#f97316 100%);
  --gradient-soft:linear-gradient(135deg,rgba(245,158,11,.18) 0%,rgba(249,115,22,.12) 100%);
  --shadow-glow:0 0 60px -20px rgba(245,158,11,.45);
}

/* ─── three.js canvas ───────────────────────────────────────── */
#hero-canvas{
  position:fixed;
  inset:0;
  width:100%;
  height:100%;
  z-index:0;
  pointer-events:none;
}
#hero-vignette{
  position:fixed;
  inset:0;
  z-index:1;
  pointer-events:none;
  background:
    radial-gradient(ellipse at 50% 35%,transparent 0%,rgba(7,7,10,.35) 45%,rgba(7,7,10,.9) 85%),
    linear-gradient(180deg,transparent 40%,#07070a 100%);
}

/* ─── nav ───────────────────────────────────────────────────── */
.nav{
  position:fixed;
  top:0;left:0;right:0;
  z-index:50;
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding:18px 32px;
  backdrop-filter:blur(10px) saturate(1.3);
  -webkit-backdrop-filter:blur(10px) saturate(1.3);
  background:rgba(7,7,10,.55);
  border-bottom:1px solid rgba(255,255,255,.04);
}
.nav-brand{
  font-weight:800;
  font-size:18px;
  letter-spacing:-.01em;
  background:var(--gradient);
  -webkit-background-clip:text;
  background-clip:text;
  color:transparent;
}
.nav-links{
  display:flex;
  gap:26px;
  font-size:14px;
  color:var(--muted);
  font-weight:500;
}
.nav-links a{position:relative}
.nav-links a::after{
  content:"";
  position:absolute;
  left:0;right:0;bottom:-4px;
  height:1px;
  background:var(--amber);
  transform:scaleX(0);
  transform-origin:left;
  transition:transform .22s ease;
}
.nav-links a:hover::after{transform:scaleX(1)}
@media (max-width:640px){
  .nav{padding:14px 18px}
  .nav-links{gap:16px;font-size:13px}
}

/* ─── containers ────────────────────────────────────────────── */
main{
  position:relative;
  z-index:10;
}
.section{
  position:relative;
  max-width:1180px;
  margin:0 auto;
  padding:120px 32px;
}
@media (max-width:720px){
  .section{padding:80px 20px}
}

/* ─── hero ──────────────────────────────────────────────────── */
.hero{
  position:relative;
  z-index:10;
  min-height:100vh;
  display:flex;
  flex-direction:column;
  justify-content:center;
  padding:120px 32px 80px;
  max-width:1180px;
  margin:0 auto;
}
.hero-inner{
  max-width:820px;
  opacity:0;
  transform:translateY(20px);
  animation:fadeUp 1.1s .3s cubic-bezier(.2,.7,.2,1) forwards;
}
.hero-eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  padding:8px 14px;
  border-radius:999px;
  border:1px solid rgba(245,158,11,.22);
  background:rgba(245,158,11,.05);
  font-size:13px;
  color:var(--muted);
  letter-spacing:.02em;
  margin-bottom:32px;
  backdrop-filter:blur(8px);
  -webkit-backdrop-filter:blur(8px);
}
.eyebrow-accent{color:var(--amber);font-weight:600}
.hero-eyebrow .dot{
  width:6px;height:6px;
  border-radius:50%;
  background:var(--amber);
  box-shadow:0 0 12px var(--amber-glow);
  animation:pulse 2.4s ease-in-out infinite;
}
@keyframes pulse{
  0%,100%{opacity:.6;transform:scale(1)}
  50%{opacity:1;transform:scale(1.4)}
}

.hero-title{
  font-size:clamp(48px,8.6vw,118px);
  font-weight:800;
  line-height:.98;
  letter-spacing:-.045em;
  margin-bottom:28px;
  background:linear-gradient(180deg,#fafafa 0%,#d4d4d8 100%);
  -webkit-background-clip:text;
  background-clip:text;
  color:transparent;
}
.hero-tag{
  font-size:clamp(20px,2.6vw,30px);
  font-weight:400;
  color:var(--muted);
  letter-spacing:-.01em;
  line-height:1.35;
  margin-bottom:20px;
}
.tag-accent{
  background:var(--gradient);
  -webkit-background-clip:text;
  background-clip:text;
  color:transparent;
  font-weight:600;
}
.hero-sub{
  font-size:16px;
  color:var(--dim);
  margin-bottom:44px;
  letter-spacing:.005em;
}
.hero-sub em{color:var(--amber);font-style:normal;font-weight:600}

.hero-stats{
  display:flex;
  gap:36px;
  list-style:none;
  margin-bottom:44px;
  flex-wrap:wrap;
}
.hero-stats li{
  display:flex;
  flex-direction:column;
  gap:2px;
}
.hero-stats b{
  font-size:40px;
  font-weight:800;
  line-height:1;
  background:var(--gradient);
  -webkit-background-clip:text;
  background-clip:text;
  color:transparent;
}
.hero-stats span{
  font-size:12px;
  color:var(--dim);
  letter-spacing:.06em;
  text-transform:uppercase;
}

.hero-cta{
  display:flex;
  gap:14px;
  flex-wrap:wrap;
}
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  padding:14px 24px;
  border-radius:999px;
  font-size:15px;
  font-weight:600;
  letter-spacing:.005em;
  transition:transform .18s ease,box-shadow .22s ease,background .18s ease,border-color .18s ease;
  cursor:pointer;
  will-change:transform;
}
.btn-primary{
  background:var(--gradient);
  color:#1a0f00;
  box-shadow:0 6px 24px -8px rgba(245,158,11,.7);
}
.btn-primary:hover{
  transform:translateY(-2px);
  box-shadow:0 10px 32px -8px rgba(245,158,11,.9);
  color:#0f0800;
}
.btn-ghost{
  border:1px solid rgba(255,255,255,.14);
  color:var(--text);
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
  background:rgba(255,255,255,.02);
}
.btn-ghost:hover{
  border-color:var(--amber);
  color:var(--amber);
  transform:translateY(-2px);
}

.scroll-hint{
  position:absolute;
  bottom:32px;
  left:50%;
  transform:translateX(-50%);
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:6px;
  color:var(--dim);
  font-size:11px;
  letter-spacing:.15em;
  text-transform:uppercase;
  opacity:0;
  animation:fadeUp 1s 1.8s ease forwards;
}
.scroll-hint svg{opacity:.65}

@keyframes fadeUp{to{opacity:1;transform:translateY(0)}}

/* ─── sections shared ──────────────────────────────────────── */
.section-head{
  max-width:720px;
  margin-bottom:60px;
}
.kicker{
  display:inline-block;
  font-size:12px;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--amber);
  font-weight:700;
  margin-bottom:18px;
}
.section h2{
  font-size:clamp(32px,5vw,52px);
  font-weight:700;
  letter-spacing:-.025em;
  line-height:1.1;
  margin-bottom:18px;
  background:linear-gradient(180deg,#fafafa 0%,#a1a1aa 100%);
  -webkit-background-clip:text;
  background-clip:text;
  color:transparent;
}
.section-sub{
  font-size:17px;
  color:var(--muted);
  line-height:1.65;
  max-width:640px;
}

/* ─── timeline ──────────────────────────────────────────────── */
.timeline{
  list-style:none;
  position:relative;
  padding-left:28px;
  border-left:1px solid rgba(245,158,11,.18);
  display:flex;
  flex-direction:column;
  gap:36px;
}
.timeline li{
  position:relative;
  padding:18px 22px 18px 18px;
  border-radius:14px;
  background:var(--card);
  border:1px solid var(--border);
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
  transition:border-color .22s ease,background .22s ease,transform .22s ease;
}
.timeline li:hover{
  border-color:var(--border-hover);
  background:var(--card-hover);
  transform:translateX(4px);
}
.timeline li::before{
  content:"";
  position:absolute;
  left:-35px;
  top:24px;
  width:14px;
  height:14px;
  border-radius:50%;
  background:var(--bg);
  border:2px solid var(--amber);
  box-shadow:0 0 16px rgba(245,158,11,.4);
}
.timeline time{
  display:inline-block;
  font-size:12px;
  letter-spacing:.12em;
  text-transform:uppercase;
  color:var(--amber);
  font-weight:600;
  margin-bottom:6px;
}
.timeline h3{
  font-size:19px;
  font-weight:600;
  letter-spacing:-.01em;
  margin-bottom:4px;
  color:var(--text);
}
.timeline p{
  font-size:14.5px;
  color:var(--muted);
  line-height:1.55;
}
.timeline a{
  color:var(--amber);
  font-weight:500;
  border-bottom:1px dashed rgba(245,158,11,.35);
}
.timeline a:hover{border-bottom-style:solid;color:#fcd34d}

/* ─── grid cards ────────────────────────────────────────────── */
.grid{
  display:grid;
  gap:18px;
}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-2{grid-template-columns:repeat(2,1fr)}
@media (max-width:960px){
  .grid-3{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:640px){
  .grid-3,.grid-2{grid-template-columns:1fr}
}

.card{
  display:flex;
  flex-direction:column;
  gap:12px;
  padding:28px;
  border-radius:18px;
  background:var(--card);
  border:1px solid var(--border);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  transition:transform .28s cubic-bezier(.2,.7,.2,1),border-color .28s,background .28s,box-shadow .28s;
  position:relative;
  overflow:hidden;
  min-height:260px;
}
.card::before{
  content:"";
  position:absolute;
  inset:0;
  opacity:0;
  background:radial-gradient(500px circle at var(--mx,50%) var(--my,0%),rgba(245,158,11,.1),transparent 40%);
  transition:opacity .4s ease;
  pointer-events:none;
}
.card:hover::before{opacity:1}
.card:hover{
  border-color:var(--border-hover);
  background:var(--card-hover);
  transform:translateY(-4px);
  box-shadow:var(--shadow-glow);
}
.card-tag{
  font-size:11px;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--amber);
  font-weight:700;
  opacity:.9;
}
.card h3{
  font-size:24px;
  font-weight:700;
  letter-spacing:-.015em;
  color:var(--text);
}
.card p{
  font-size:14.5px;
  color:var(--muted);
  line-height:1.6;
  flex:1;
}
.card-stats{
  display:flex;
  gap:24px;
  list-style:none;
  margin-top:6px;
}
.card-stats li{display:flex;flex-direction:column;gap:2px}
.card-stats b{
  font-size:22px;
  font-weight:800;
  background:var(--gradient);
  -webkit-background-clip:text;
  background-clip:text;
  color:transparent;
  line-height:1;
}
.card-stats span{
  font-size:11px;
  color:var(--dim);
  letter-spacing:.04em;
}
.card-link{
  font-size:13px;
  color:var(--amber);
  font-weight:600;
  letter-spacing:.02em;
  margin-top:4px;
  transition:transform .22s ease;
  align-self:flex-start;
}
.card:hover .card-link{transform:translateX(4px)}

/* ─── papers ───────────────────────────────────────────────── */
.paper{
  display:flex;
  flex-direction:column;
  gap:14px;
  padding:32px;
  border-radius:18px;
  background:var(--card);
  border:1px solid var(--border);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  transition:transform .28s ease,border-color .28s ease,box-shadow .28s ease;
  position:relative;
  overflow:hidden;
}
.paper::before{
  content:"";
  position:absolute;
  inset:0;
  background:var(--gradient-soft);
  opacity:0;
  transition:opacity .3s ease;
  pointer-events:none;
}
.paper:hover::before{opacity:.5}
.paper:hover{
  border-color:var(--border-hover);
  transform:translateY(-4px);
  box-shadow:var(--shadow-glow);
}
.paper > *{position:relative;z-index:1}
.paper-doi{
  font-family:ui-monospace,"SF Mono",Menlo,monospace;
  font-size:12px;
  color:var(--amber);
  letter-spacing:.01em;
}
.paper h3{
  font-size:22px;
  font-weight:700;
  letter-spacing:-.015em;
  line-height:1.3;
}
.paper p{
  font-size:15px;
  color:var(--muted);
  line-height:1.6;
}

/* ─── stack pills ──────────────────────────────────────────── */
.stack{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
}
.stack span{
  padding:8px 16px;
  border-radius:999px;
  border:1px solid var(--border);
  background:var(--card);
  font-size:13px;
  color:var(--muted);
  font-weight:500;
  transition:border-color .22s ease,color .22s ease,transform .18s ease;
}
.stack span:hover{
  border-color:var(--amber);
  color:var(--amber);
  transform:translateY(-2px);
}

/* ─── contact ──────────────────────────────────────────────── */
.section-contact{
  background:linear-gradient(180deg,transparent 0%,rgba(245,158,11,.03) 100%);
  border-top:1px solid rgba(245,158,11,.08);
}
.contact-grid{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:14px;
}
@media (max-width:720px){.contact-grid{grid-template-columns:1fr}}
.contact-card{
  display:flex;
  flex-direction:column;
  gap:6px;
  padding:24px 28px;
  border-radius:14px;
  background:var(--card);
  border:1px solid var(--border);
  transition:border-color .22s ease,transform .22s ease;
}
.contact-card:hover{
  border-color:var(--amber);
  transform:translateY(-2px);
}
.contact-kind{
  font-size:11px;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--amber);
  font-weight:700;
}
.contact-value{
  font-size:17px;
  font-weight:600;
  letter-spacing:-.005em;
}

/* ─── footer ───────────────────────────────────────────────── */
.footer{
  position:relative;
  z-index:10;
  background:#050508;
  border-top:1px solid rgba(255,255,255,.05);
  padding:80px 32px 32px;
  margin-top:60px;
}
.footer-inner{
  max-width:1180px;
  margin:0 auto;
  display:grid;
  grid-template-columns:1fr 3fr;
  gap:60px;
  padding-bottom:40px;
  border-bottom:1px solid rgba(255,255,255,.04);
}
@media (max-width:820px){
  .footer-inner{grid-template-columns:1fr}
  .footer{padding:60px 20px 24px}
}
.footer-brand{
  display:flex;
  flex-direction:column;
  gap:8px;
}
.footer-brand strong{
  font-size:18px;
  font-weight:700;
  letter-spacing:-.01em;
}
.footer-brand span{
  font-size:13px;
  color:var(--dim);
  line-height:1.6;
}
.footer-links{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:28px;
}
@media (max-width:640px){
  .footer-links{grid-template-columns:repeat(2,1fr)}
}
.footer-links > div{
  display:flex;
  flex-direction:column;
  gap:10px;
}
.footer-links b{
  font-size:11px;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--amber);
  font-weight:700;
  margin-bottom:4px;
}
.footer-links a{
  font-size:13.5px;
  color:var(--muted);
  transition:color .16s ease;
}
.footer-links a:hover{color:var(--amber)}
.footer-fine{
  max-width:1180px;
  margin:0 auto;
  padding-top:28px;
  display:flex;
  justify-content:space-between;
  flex-wrap:wrap;
  gap:12px;
  font-size:12px;
  color:var(--faint);
  letter-spacing:.02em;
}

/* ─── intersection fade-in (enhanced by main.js) ─────────────── */
.reveal{
  opacity:0;
  transform:translateY(24px);
  transition:opacity .8s cubic-bezier(.2,.7,.2,1),transform .8s cubic-bezier(.2,.7,.2,1);
}
.reveal.in{opacity:1;transform:translateY(0)}

/* ─── reduced motion ───────────────────────────────────────── */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.01ms !important;
  }
  html{scroll-behavior:auto}
}

/* ─── selection ────────────────────────────────────────────── */
::selection{background:rgba(245,158,11,.35);color:#fff}