/* ===========================================================================
   Justas Petrulis — jewellery CAD portfolio
   Dark showcase theme: near-black backdrop so stone renders and the live
   3D model read the way they would on a jeweller's velvet tray.
   Self-contained CSS, system font stack (no font-loading dependency).
   Three.js viewer is progressive enhancement — the rest of the page never
   depends on it loading.
   =========================================================================== */

/* ------------------------------- tokens ------------------------------- */
:root{
  --bg:#0b0b0d; --bg2:#131316; --panel:#17171a; --ink:#f4f1ea; --sub:#9a958d; --line:#26262a;
  --accent:#cda45e; --accent-soft:rgba(205,164,94,.14); --accent-ink:#141210;
  --radius:18px; --maxw:1220px;
  --ease:cubic-bezier(.22,1,.36,1);
  --shadow:0 1px 2px rgba(0,0,0,.3),0 12px 32px rgba(0,0,0,.35);
  --shadow-lift:0 8px 22px rgba(0,0,0,.4),0 30px 64px rgba(0,0,0,.5);
  --font-display:-apple-system,BlinkMacSystemFont,"Segoe UI",Helvetica,Arial,sans-serif;
  --font-body:-apple-system,BlinkMacSystemFont,"Segoe UI",Helvetica,Arial,sans-serif;
  --font-mono:ui-monospace,"SF Mono",Menlo,Consolas,monospace;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:84px}
body{background:var(--bg);color:var(--ink);font-family:var(--font-body);
  font-size:16px;line-height:1.6;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
a{color:inherit;text-decoration:none}
img{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
ul{list-style:none}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 clamp(20px,4vw,32px)}

.mono{font-family:var(--font-mono);font-size:11.5px;font-weight:400;
  letter-spacing:.12em;text-transform:uppercase;color:var(--sub)}

.skip{position:absolute;left:-9999px;top:0;z-index:200;background:var(--accent);color:var(--accent-ink);
  padding:12px 20px;border-radius:0 0 12px 0;font-weight:600}
.skip:focus{left:0}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:2px}

[data-reveal]{opacity:0;transform:translateY(26px);
  transition:opacity .9s var(--ease),transform .9s var(--ease);will-change:opacity,transform}
[data-reveal].in{opacity:1;transform:none}

/* -------------------------------- nav -------------------------------- */
nav{position:sticky;top:0;z-index:50;background:rgba(11,11,13,.82);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
nav .wrap{display:flex;align-items:center;justify-content:space-between;height:68px}
.brand{font-family:var(--font-display);font-weight:700;letter-spacing:-.01em;font-size:17px}
.brand span{color:var(--accent)}
.nav-links{display:flex;gap:30px;font-size:14.5px;font-weight:500}
.nav-links a{color:var(--sub);position:relative;transition:color .25s var(--ease)}
.nav-links a::after{content:"";position:absolute;left:0;bottom:-4px;height:1.5px;width:100%;
  background:var(--accent);transform:scaleX(0);transform-origin:right;transition:transform .35s var(--ease)}
.nav-links a:hover{color:var(--ink)}
.nav-links a:hover::after{transform:scaleX(1);transform-origin:left}
.nav-cta{border:1px solid var(--accent);color:var(--accent);padding:9px 17px;border-radius:11px;font-size:14px;
  font-weight:500;transition:background .25s var(--ease),color .25s var(--ease)}
.nav-cta:hover{background:var(--accent);color:var(--accent-ink)}
@media(max-width:720px){.nav-links{display:none}}

/* -------------------------------- hero -------------------------------- */
.hero{padding:clamp(64px,10vh,108px) 0 48px}
.eyebrow{display:inline-flex;align-items:center;gap:9px;font-family:var(--font-mono);
  font-size:11.5px;letter-spacing:.12em;text-transform:uppercase;color:var(--accent);
  background:var(--accent-soft);padding:9px 16px;border-radius:999px;margin-bottom:28px}
.eyebrow .live{width:7px;height:7px;border-radius:50%;background:var(--accent);
  animation:pulse 2.4s var(--ease) infinite}
@keyframes pulse{0%,100%{opacity:1;transform:scale(1)}50%{opacity:.45;transform:scale(.8)}}
h1{font-family:var(--font-display);font-weight:700;font-size:clamp(38px,7vw,80px);
  line-height:1.03;letter-spacing:-.03em;max-width:16ch}
h1 .accent{color:var(--accent)}
.hl-line{display:block;overflow:hidden}
.hero .lead{font-size:clamp(16px,2vw,19px);color:var(--sub);max-width:640px;margin:26px 0 32px}
.cta{display:flex;gap:13px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:9px;padding:14px 26px;border-radius:12px;
  font-weight:500;font-size:15px;
  transition:transform .3s var(--ease),background .25s var(--ease),border-color .25s var(--ease),color .25s var(--ease)}
.btn:hover{transform:translateY(-2px)}
.btn-primary{background:var(--accent);color:var(--accent-ink)}
.btn-primary:hover{background:#ddb877}
.btn-ghost{border:1px solid var(--line);background:transparent;color:var(--ink)}
.btn-ghost:hover{border-color:var(--accent);color:var(--accent)}

/* -------------------------------- sections -------------------------------- */
section{padding:clamp(56px,8vw,88px) 0}
.sec-head{max-width:640px;margin-bottom:34px}
.sec-head .mono{display:block;margin-bottom:14px}
.sec-head h2{font-family:var(--font-display);font-weight:700;
  font-size:clamp(28px,3.6vw,42px);letter-spacing:-.03em;line-height:1.08;margin-bottom:14px}
.sec-head p{color:var(--sub);font-size:15.5px}

/* ------------------------------ 3D viewer ------------------------------ */
#viewer{padding-top:0;padding-bottom:clamp(40px,6vw,64px)}
.viewer-frame{background:var(--panel);border:1px solid var(--line);border-radius:24px;
  overflow:hidden;box-shadow:var(--shadow)}
.viewer-stage{position:relative;width:100%;aspect-ratio:16/9;max-height:640px;
  background:radial-gradient(circle at 50% 42%,#1c1c20,#0c0c0e 78%)}
#ringCanvas{position:absolute;inset:0;width:100%;height:100%;display:block;touch-action:none}
.viewer-status{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);
  display:flex;align-items:center;gap:10px;font-family:var(--font-mono);font-size:12px;
  letter-spacing:.08em;text-transform:uppercase;color:var(--sub);
  transition:opacity .4s var(--ease);pointer-events:none}
.viewer-status.hide{opacity:0}
.viewer-status.err{color:#d98a6a;max-width:280px;text-align:center;line-height:1.5}
.spin{width:15px;height:15px;border-radius:50%;border:2px solid rgba(205,164,94,.25);
  border-top-color:var(--accent);animation:spin .8s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.viewer-hint{position:absolute;left:20px;bottom:16px;color:#fff;opacity:.55;
  transition:opacity .4s var(--ease)}
.viewer-hint.hide{opacity:0}
.viewer-cap{display:flex;flex-direction:column;gap:3px;padding:20px 26px 24px;border-top:1px solid var(--line)}
.viewer-cap .t{font-weight:600;font-size:15.5px}
.viewer-cap .s{font-size:13.5px;color:var(--sub)}

/* -------------------------------- gallery grid -------------------------------- */
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.card{background:var(--panel);border:1px solid var(--line);border-radius:16px;overflow:hidden;
  text-align:left;box-shadow:var(--shadow);
  transition:transform .4s var(--ease),box-shadow .4s var(--ease),border-color .4s var(--ease)}
.card:hover,.card:focus-visible{transform:translateY(-5px);box-shadow:var(--shadow-lift);border-color:#3a3a40}
.card-img{display:block;aspect-ratio:1/1;overflow:hidden;background:#0f0f11}
.card-img img{width:100%;height:100%;object-fit:cover;transition:transform .6s var(--ease)}
.card:hover .card-img img,.card:focus-visible .card-img img{transform:scale(1.05)}
.card-cap{display:flex;flex-direction:column;gap:3px;padding:14px 16px 16px}
.card-cap .t{font-weight:600;font-size:14.5px}
.card-cap .s{font-size:12.5px;color:var(--sub)}
@media(max-width:900px){.grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:560px){.grid{grid-template-columns:1fr}}

/* -------------------------------- about -------------------------------- */
.about{background:var(--panel);border:1px solid var(--line);border-radius:28px;
  padding:clamp(36px,6vw,60px) clamp(24px,5vw,56px);
  display:grid;grid-template-columns:1.5fr 1fr;gap:44px;align-items:start}
.about .mono{display:block;margin-bottom:16px}
.about h2{font-family:var(--font-display);font-weight:700;
  font-size:clamp(26px,3.4vw,36px);letter-spacing:-.03em;line-height:1.1;margin-bottom:18px}
.about p{color:var(--sub);font-size:15.5px;margin-bottom:14px;max-width:56ch}
.about .hl{color:var(--ink);font-weight:600}
.tool-list{display:flex;flex-wrap:wrap;gap:9px;margin-top:14px}
.tool-list li{font-family:var(--font-mono);font-size:11.5px;letter-spacing:.05em;text-transform:uppercase;
  color:var(--ink);background:var(--accent-soft);border:1px solid rgba(205,164,94,.25);
  padding:8px 13px;border-radius:999px}
@media(max-width:780px){.about{grid-template-columns:1fr;gap:26px}}

/* -------------------------------- contact -------------------------------- */
.contact-block{background:var(--accent);color:var(--accent-ink);border-radius:28px;
  padding:clamp(36px,6vw,60px) clamp(24px,5vw,56px)}
.contact-block .mono{color:rgba(20,18,16,.62);display:block;margin-bottom:14px}
.contact-block h2{font-family:var(--font-display);font-weight:700;
  font-size:clamp(28px,3.6vw,42px);letter-spacing:-.03em;margin-bottom:26px}
.contact-links{display:flex;flex-direction:column;max-width:520px}
.contact-links a{display:flex;align-items:center;gap:12px;padding:15px 2px;
  border-bottom:1px solid rgba(20,18,16,.18);font-size:16px;font-weight:500;
  transition:padding-left .3s var(--ease)}
.contact-links a:last-child{border-bottom:0}
.contact-links a:hover{padding-left:8px}
.contact-links .mono{color:rgba(20,18,16,.55);width:24px;letter-spacing:0}

/* -------------------------------- footer -------------------------------- */
footer{border-top:1px solid var(--line)}
footer .wrap{padding-top:32px;padding-bottom:40px;display:flex;justify-content:space-between;
  align-items:center;flex-wrap:wrap;gap:12px}
footer .mono{letter-spacing:.08em}
.footer-links{display:flex;gap:20px}
.footer-links a{transition:color .25s var(--ease)}
.footer-links a:hover{color:var(--accent)}
.to-top{transition:color .25s var(--ease)}
.to-top:hover{color:var(--accent)}

/* ------------------------- lightbox ------------------------- */
.lb{position:fixed;inset:0;background:rgba(6,6,7,.96);display:none;z-index:100;
  flex-direction:column;align-items:center;justify-content:center;padding:28px}
.lb.open{display:flex}
.lb-stage{flex:1;display:flex;align-items:center;justify-content:center;width:100%;max-height:78vh}
.lb-stage img{max-width:min(1100px,92vw);max-height:78vh;object-fit:contain;border-radius:6px;
  box-shadow:0 30px 90px rgba(0,0,0,.6)}
.lb-bar{display:flex;align-items:center;justify-content:space-between;gap:18px;width:100%;
  max-width:1100px;color:#fff;margin-top:18px;border-top:1px solid rgba(255,255,255,.14);padding-top:16px}
.lb-title{font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;text-transform:uppercase}
.lb-count{font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;color:#9d9fa9}
.lb-nav{display:flex;gap:10px}
.lb-btn{width:44px;height:44px;border-radius:50%;border:1px solid #3a3b45;
  background:rgba(255,255,255,.06);color:#fff;font-size:20px;
  display:flex;align-items:center;justify-content:center;transition:background .25s var(--ease)}
.lb-btn:hover{background:rgba(255,255,255,.16)}
.lb-close{position:absolute;top:22px;right:26px;width:44px;height:44px;border-radius:50%;
  border:1px solid #3a3b45;background:rgba(255,255,255,.06);color:#fff;font-size:19px;z-index:2}
.lb-close:hover{background:rgba(255,255,255,.16)}
@media(max-width:560px){.lb-title{display:none}}

/* --------------------------- reduced motion --------------------------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  [data-reveal]{opacity:1!important;transform:none!important;transition:none!important}
  .eyebrow .live{animation:none}
  .card,.btn{transition:none}
  .spin{animation:none}
}