/* ============ tokens ============ */
:root{
  --bg:#07090b;
  --bg-2:#0b0f13;
  --fg:#eef2f4;
  --dim:#9aa6ad;
  --accent:#39d6cf;
  --accent-soft:rgba(57,214,207,.14);
  --line:rgba(255,255,255,.09);
  --glass:rgba(255,255,255,.035);
  --r:6px;
  --ease:cubic-bezier(.22,.85,.28,1);
  --dur:1.05s;
  --font:"DM Sans",system-ui,sans-serif;
  --font-d:"Space Grotesk",system-ui,sans-serif;
  --mono:"JetBrains Mono",ui-monospace,monospace;
}
*{box-sizing:border-box;margin:0;padding:0}
html,body{height:100%}
html{scroll-behavior:smooth}
body{
  background:var(--bg);color:var(--fg);font-family:var(--font);
  overflow-x:hidden;-webkit-font-smoothing:antialiased;
}
img{display:block;max-width:100%;height:auto}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
a{color:inherit;text-decoration:none}
.skip{position:fixed;left:-999px;top:0;z-index:99}
.skip:focus{left:12px;top:12px;background:var(--accent);color:#04140f;padding:8px 14px;border-radius:var(--r)}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px}

/* ============ background ============ */
.bg-layer{position:fixed;inset:0;z-index:0;pointer-events:none;overflow:hidden;
  background:radial-gradient(120% 80% at 70% -10%,#101820 0%,var(--bg) 55%)}
.grid-lines{position:absolute;inset:-10%;opacity:.35;
  background-image:linear-gradient(var(--line) 1px,transparent 1px),linear-gradient(90deg,var(--line) 1px,transparent 1px);
  background-size:120px 120px;
  mask-image:radial-gradient(70% 60% at 50% 45%,#000 0%,transparent 85%);
  transform:translate3d(0,0,0);will-change:transform}
.orb{position:absolute;border-radius:50%;filter:blur(90px);will-change:transform}
.orb-a{width:46vw;height:46vw;left:-10vw;top:10vh;background:rgba(57,214,207,.10)}
.orb-b{width:38vw;height:38vw;right:-8vw;bottom:-10vh;background:rgba(80,120,255,.07)}

/* ============ nav ============ */
.nav{position:fixed;z-index:40;top:0;left:0;right:0;display:flex;align-items:center;justify-content:space-between;
  padding:18px clamp(16px,4vw,56px);
  background:linear-gradient(to bottom,rgba(7,9,11,.75),transparent);
  backdrop-filter:blur(8px)}
.brand{font-family:var(--font-d);font-weight:600;letter-spacing:-.02em;font-size:15px;display:flex;align-items:center;gap:9px}
.brand .dot{width:7px;height:7px;border-radius:50%;background:var(--accent);box-shadow:0 0 12px var(--accent)}
.nav-list{display:flex;gap:6px;list-style:none}
.nav-link{font-size:13px;color:var(--dim);padding:7px 12px;border-radius:var(--r);
  transition:color .3s var(--ease),background .3s var(--ease)}
.nav-link:hover{color:var(--fg)}
.nav-link.active{color:var(--fg);background:var(--glass);box-shadow:inset 0 0 0 1px var(--line)}
.nav-toggle{display:none;width:38px;height:32px;flex-direction:column;justify-content:center;gap:6px}
.nav-toggle span{display:block;height:1px;background:var(--fg);transition:transform .35s var(--ease),opacity .3s}
.nav.open .nav-toggle span:first-child{transform:translateY(3.5px) rotate(45deg)}
.nav.open .nav-toggle span:last-child{transform:translateY(-3.5px) rotate(-45deg)}

/* ============ rail ============ */
.rail{position:fixed;z-index:35;right:clamp(14px,2.4vw,34px);top:50%;transform:translateY(-50%);
  display:flex;flex-direction:column;align-items:center;gap:14px}
.rail-track{width:1px;height:32vh;background:var(--line);position:relative;overflow:hidden}
.rail-fill{position:absolute;inset:0 0 auto 0;height:0;background:var(--accent);transition:height .7s var(--ease)}
.rail-count{font-family:var(--mono);font-size:11px;color:var(--dim);letter-spacing:.1em}
.rail-count .cur{color:var(--fg)}

/* ============ deck / slides ============ */
.deck{position:relative;z-index:1;height:100svh;overflow-y:scroll;scroll-snap-type:y mandatory;
  scrollbar-width:none;overscroll-behavior-y:contain}
.deck::-webkit-scrollbar{display:none}
.slide{position:relative;height:100svh;scroll-snap-align:start;scroll-snap-stop:always;
  display:flex;flex-direction:column;justify-content:center;
  padding:96px clamp(20px,6vw,110px) 72px}
.wrap{width:100%;max-width:1320px;margin:0 auto}
.split{display:grid;grid-template-columns:1.05fr .95fr;gap:clamp(28px,5vw,80px);align-items:center}
.split.reverse{grid-template-columns:.95fr 1.05fr}

/* ============ type ============ */
.kicker{font-family:var(--mono);font-size:11px;letter-spacing:.22em;text-transform:uppercase;color:var(--accent);margin-bottom:18px}
.display{font-family:var(--font-d);font-weight:600;letter-spacing:-.045em;line-height:.96;
  font-size:clamp(42px,7.2vw,104px)}
.display em{font-style:normal;color:var(--accent)}
.display.sm{font-size:clamp(34px,5vw,74px)}
.title{font-family:var(--font-d);font-weight:600;letter-spacing:-.035em;line-height:1.06;
  font-size:clamp(28px,3.6vw,54px);max-width:16ch}
.title.mb{margin-bottom:clamp(24px,3.5vh,48px)}
.lead{font-family:var(--font-d);font-size:clamp(16px,1.5vw,24px);margin-top:20px;letter-spacing:-.01em}
.body{font-size:clamp(14px,1.05vw,17px);line-height:1.65;max-width:56ch;margin-top:14px}
.dim{color:var(--dim)}
.mono{font-family:var(--mono)}
.accent{color:var(--accent)}

/* ============ buttons ============ */
.actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:clamp(22px,3.5vh,38px)}
.btn{display:inline-flex;align-items:center;justify-content:center;padding:11px 20px;border-radius:var(--r);
  font-size:13.5px;letter-spacing:.01em;border:1px solid var(--line);background:var(--glass);
  transition:transform .35s var(--ease),background .35s var(--ease),border-color .35s var(--ease)}
.btn:hover{transform:translateY(-2px);border-color:rgba(255,255,255,.24)}
.btn-primary{background:var(--accent);color:#04140f;border-color:transparent;font-weight:500}
.btn-primary:hover{background:#5ce6df}
.btn-ghost{background:transparent}

/* ============ hero ============ */
.hero{display:grid;grid-template-columns:1.1fr .9fr;gap:clamp(28px,5vw,72px);align-items:center}
.hero-visual{position:relative}
.tilt{position:relative;border-radius:calc(var(--r) + 2px);overflow:hidden;border:1px solid var(--line);
  transform-style:preserve-3d;transition:transform .5s var(--ease);will-change:transform}
.tilt img{width:100%;aspect-ratio:1/1;object-fit:cover}
.frame{position:absolute;inset:14px;border:1px solid rgba(255,255,255,.07);pointer-events:none}
.float-chip{position:absolute;font-family:var(--mono);font-size:11px;letter-spacing:.06em;color:var(--dim);
  padding:8px 13px;border:1px solid var(--line);border-radius:var(--r);
  background:rgba(11,15,19,.65);backdrop-filter:blur(10px);will-change:transform}
.chip-1{left:-18px;top:16%}
.chip-2{right:-14px;bottom:14%}
.scroll-hint{position:absolute;left:50%;bottom:26px;transform:translateX(-50%);
  font-family:var(--mono);font-size:10px;letter-spacing:.2em;text-transform:uppercase;color:var(--dim);
  display:flex;align-items:center;gap:10px}
.scroll-hint span{width:1px;height:26px;background:linear-gradient(var(--accent),transparent);animation:drop 2.2s var(--ease) infinite}
@keyframes drop{0%{opacity:0;transform:scaleY(.2)}40%{opacity:1}100%{opacity:0;transform:scaleY(1) translateY(10px)}}

/* ============ about ============ */
.about-visual{position:relative;border:1px solid var(--line);border-radius:calc(var(--r) + 2px);overflow:hidden}
.about-visual img{width:100%;aspect-ratio:4/5;object-fit:cover}
.facts{margin-top:clamp(20px,3vh,34px);display:grid;gap:14px}
.facts div{display:grid;grid-template-columns:120px 1fr;gap:16px;padding-bottom:14px;border-bottom:1px solid var(--line)}
.facts dt{font-family:var(--mono);font-size:10.5px;letter-spacing:.16em;text-transform:uppercase;color:var(--accent);padding-top:3px}
.facts dd{font-size:14.5px;line-height:1.55;color:var(--dim)}

/* ============ skills ============ */
.skill-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.skill-cat{padding:20px 20px 18px;border:1px solid var(--line);border-radius:var(--r);
  background:linear-gradient(160deg,var(--glass),rgba(255,255,255,.01));
  transition:transform .5s var(--ease),border-color .4s var(--ease)}
.skill-cat:hover{transform:translateY(-5px);border-color:rgba(57,214,207,.35)}
.skill-cat h3{font-family:var(--mono);font-size:10.5px;letter-spacing:.18em;text-transform:uppercase;color:var(--accent);margin-bottom:14px}
.skill-cat ul{list-style:none;display:flex;flex-wrap:wrap;gap:7px}
.skill-cat li{font-size:13px;padding:6px 12px;border-radius:var(--r);border:1px solid var(--line);color:var(--fg);background:rgba(255,255,255,.02)}

/* ============ projects ============ */
.proj-index{font-family:var(--mono);font-size:11.5px;letter-spacing:.2em;color:var(--dim);margin-bottom:16px}
.proj-visual{position:relative;border:1px solid var(--line);border-radius:calc(var(--r) + 2px);overflow:hidden;
  background:var(--bg-2)}
.proj-visual img{width:100%;aspect-ratio:4/3;object-fit:cover}
.pill-list{list-style:none;display:flex;flex-wrap:wrap;gap:7px;margin-top:20px}
.pill-list li{font-size:12.5px;color:var(--dim);padding:6px 12px;border:1px solid var(--line);border-radius:var(--r)}
.tech{font-size:11.5px;letter-spacing:.05em;color:var(--dim);margin-top:18px}
.flow{position:absolute;left:0;right:0;bottom:0;list-style:none;display:flex;gap:6px;flex-wrap:wrap;
  padding:14px;background:linear-gradient(to top,rgba(7,9,11,.92),transparent)}
.flow li{font-family:var(--mono);font-size:10px;letter-spacing:.08em;text-transform:uppercase;color:var(--dim);
  padding:6px 10px;border:1px solid var(--line);border-radius:var(--r);background:rgba(11,15,19,.6)}
.flow li + li::before{content:"→ ";color:var(--accent)}

/* ============ education ============ */
.timeline{list-style:none;position:relative;padding-left:30px;margin-top:10px}
.timeline::before{content:"";position:absolute;left:4px;top:6px;bottom:6px;width:1px;background:var(--line)}
.timeline li{position:relative;padding:0 0 18px}
.timeline .node{position:absolute;left:-30px;top:8px;width:9px;height:9px;border-radius:50%;
  background:var(--accent);box-shadow:0 0 0 5px var(--accent-soft)}
.timeline h3{font-family:var(--font-d);font-size:clamp(20px,2.2vw,30px);font-weight:600;letter-spacing:-.02em}

/* ============ contact ============ */
.contact{align-items:start;padding-top:2vh}
.links{list-style:none;margin-top:28px;display:grid;gap:10px}
.links a{font-size:15px;color:var(--dim);border-bottom:1px solid transparent;transition:color .3s,border-color .3s}
.links a:hover{color:var(--accent);border-color:var(--accent)}
.form{display:grid;gap:12px;padding:24px;border:1px solid var(--line);border-radius:calc(var(--r) + 2px);background:var(--glass)}
.form label{display:grid;gap:7px;font-family:var(--mono);font-size:10.5px;letter-spacing:.16em;text-transform:uppercase;color:var(--dim)}
.form input,.form textarea{font-family:var(--font);font-size:14.5px;color:var(--fg);background:rgba(0,0,0,.25);
  border:1px solid var(--line);border-radius:var(--r);padding:11px 13px;resize:vertical}
.form input:focus,.form textarea:focus{outline:none;border-color:var(--accent)}
.form-status{font-size:12.5px;color:var(--accent);min-height:16px}
.footer{position:absolute;left:0;right:0;bottom:0;padding:16px clamp(20px,6vw,110px);
  border-top:1px solid var(--line);font-family:var(--mono);font-size:10.5px;letter-spacing:.12em;color:var(--dim)}

/* ============ transitions ============ */
[data-anim]{will-change:transform,opacity}
.slide:not(.is-active) [data-anim]{opacity:0}
.slide:not(.is-active) [data-anim="up"]{transform:translateY(46px)}
.slide:not(.is-active) [data-anim="right"]{transform:translateX(90px) scale(1.06) rotate(1.2deg)}
.slide:not(.is-active) [data-anim="left"]{transform:translateX(-90px) scale(1.06) rotate(-1.2deg)}
.slide:not(.is-active) [data-anim="stagger"] > *,
.slide:not(.is-active) [data-anim="stagger"]{opacity:0;transform:translateY(28px)}
[data-anim]{transition:opacity .85s var(--ease),transform var(--dur) var(--ease);transition-delay:var(--dl,0s)}
[data-anim="stagger"] > *{transition:opacity .7s var(--ease),transform .9s var(--ease);transition-delay:var(--dl,0s)}
.slide.is-active [data-anim]{opacity:1;transform:none}
.slide.is-active [data-anim="stagger"] > *{opacity:1;transform:none}
.slide.is-prev [data-anim="right"]{transform:translateX(-70px) scale(.95)}
.slide.is-prev [data-anim="left"]{transform:translateX(70px) scale(.95)}

.parallax{will-change:transform}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  [data-anim],[data-anim="stagger"] > *{transition-duration:.01ms!important;transform:none!important}
  .slide:not(.is-active) [data-anim]{opacity:1;transform:none}
  .scroll-hint span{animation:none}
}

/* ============ responsive ============ */
@media (max-width:1000px){
  .nav-list{position:fixed;inset:64px 12px auto 12px;flex-direction:column;gap:2px;padding:12px;
    border:1px solid var(--line);border-radius:calc(var(--r) + 2px);background:rgba(9,12,15,.94);
    backdrop-filter:blur(14px);opacity:0;pointer-events:none;transform:translateY(-10px);
    transition:opacity .3s var(--ease),transform .35s var(--ease)}
  .nav.open .nav-list{opacity:1;pointer-events:auto;transform:none}
  .nav-link{width:100%;text-align:left;font-size:15px;padding:11px 12px}
  .nav-toggle{display:flex}
  .hero,.split,.split.reverse{grid-template-columns:1fr;gap:26px}
  .hero-visual,.about-visual{max-width:440px}
  .split.reverse .proj-visual{order:-1}
  .skill-grid{grid-template-columns:repeat(2,1fr)}
  .rail{display:none}
  .slide{padding:88px 20px 64px;justify-content:flex-start;overflow-y:auto}
  .slide .wrap{margin-top:auto;margin-bottom:auto}
  .float-chip{display:none}
  .scroll-hint{display:none}
  .facts div{grid-template-columns:1fr;gap:4px}
}
@media (max-width:620px){
  .skill-grid{grid-template-columns:1fr}
  .hero-visual,.about-visual{max-width:100%}
  .proj-visual img{aspect-ratio:16/11}
  .contact{gap:22px}
  .footer{position:static;margin-top:24px;padding-left:0;padding-right:0}
}