/* GOLDEN MECHANICA — Golden Cyberpunk × Luxury Minimalism */
:root{
  --gold:#c9a24b; --gold-bright:#e8c877; --champagne:#d8c9a3;
  --ink:#050505; --line:rgba(201,162,75,.28);
  --serif:"Optima","Palatino","Times New Roman",serif;
  --mono:"SF Mono",Menlo,Consolas,monospace;
}
*{margin:0;padding:0;box-sizing:border-box}
html,body{height:100%;overflow:hidden}
body{background:var(--ink);color:var(--champagne);font-family:var(--mono);cursor:crosshair}
#scene{position:fixed;inset:0;width:100%;height:100%;display:block}
/* faint golden haze */
body::before{content:"";position:fixed;inset:0;pointer-events:none;z-index:2;
  background:radial-gradient(58% 46% at 50% 44%,rgba(201,162,75,.075),transparent 70%)}
#vignette{position:fixed;inset:0;pointer-events:none;z-index:3;
  background:radial-gradient(90% 90% at 50% 50%,transparent 55%,rgba(0,0,0,.82) 100%)}
#grain{position:fixed;inset:-50%;pointer-events:none;z-index:4;opacity:.05;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence baseFrequency='.85' numOctaves='2'/%3E%3C/filter%3E%3Crect width='120' height='120' filter='url(%23n)' opacity='1'/%3E%3C/svg%3E");
  animation:grain 1.2s steps(4) infinite}
@keyframes grain{0%{transform:translate(0,0)}25%{transform:translate(-2%,3%)}50%{transform:translate(3%,-2%)}75%{transform:translate(-3%,-3%)}100%{transform:translate(0,0)}}
.hidden{opacity:0!important;pointer-events:none!important}
.ico svg{width:1em;height:1em;display:block}

/* ---------- loader ---------- */
#loader{position:fixed;inset:0;z-index:60;background:#020202;display:flex;flex-direction:column;
  align-items:center;justify-content:center;gap:18px;transition:opacity .8s}
#loader span{font-size:11px;letter-spacing:.4em;color:var(--gold)}
#loader b{color:var(--gold-bright)}
#load-bar{width:min(320px,60vw);height:1px;background:rgba(201,162,75,.18);position:relative}
#load-bar i{position:absolute;left:0;top:-1px;height:3px;width:0%;
  background:linear-gradient(90deg,transparent,var(--gold-bright));box-shadow:0 0 12px var(--gold)}

/* ---------- intro ---------- */
#intro{position:fixed;inset:0;z-index:20;pointer-events:none}
#scanline{position:absolute;left:0;right:0;top:0;height:2px;opacity:0;
  background:linear-gradient(90deg,transparent,rgba(232,200,119,.9),transparent);
  box-shadow:0 0 26px 4px rgba(201,162,75,.35)}
#intro-title{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);
  text-align:center;opacity:0;width:min(680px,90vw)}
#intro-title h1{font-family:var(--serif);font-weight:400;letter-spacing:.5em;
  font-size:clamp(1.5rem,4.6vw,3.1rem);color:var(--gold-bright);
  text-shadow:0 0 34px rgba(201,162,75,.5);margin:.5em 0 .35em;padding-left:.5em}
#intro-title .subject{font-size:11px;letter-spacing:.55em;color:var(--champagne);opacity:.85;padding-left:.55em}
#intro-title .rule{height:1px;background:linear-gradient(90deg,transparent,var(--line),transparent)}
#enter-btn{margin-top:44px;pointer-events:auto;background:none;border:1px solid var(--line);
  color:var(--gold-bright);font-family:var(--mono);font-size:11px;letter-spacing:.45em;
  padding:16px 34px 16px 28px;cursor:pointer;display:inline-flex;align-items:center;gap:12px;
  transition:all .35s;position:relative;overflow:hidden}
#enter-btn .ico{font-size:16px}
#enter-btn::before{content:"";position:absolute;inset:0;background:linear-gradient(90deg,transparent,rgba(201,162,75,.16),transparent);transform:translateX(-100%);transition:transform .6s}
#enter-btn:hover{border-color:var(--gold);box-shadow:0 0 30px rgba(201,162,75,.22)}
#enter-btn:hover::before{transform:translateX(100%)}
#skip-btn{position:absolute;bottom:34px;right:36px;pointer-events:auto;background:none;border:none;
  color:rgba(216,201,163,.5);font-family:var(--mono);font-size:10px;letter-spacing:.35em;cursor:pointer;
  transition:color .3s}
#skip-btn:hover{color:var(--gold-bright)}

/* ---------- HUD ---------- */
#hud{position:fixed;top:0;left:0;right:0;z-index:10;display:flex;justify-content:space-between;
  align-items:flex-start;padding:26px 34px;transition:opacity 1s;pointer-events:auto}
#logo{display:flex;gap:12px;align-items:center}
#logo .ico{font-size:26px;color:var(--gold-bright);filter:drop-shadow(0 0 8px rgba(201,162,75,.5))}
#logo b{display:block;font-family:var(--serif);font-weight:400;letter-spacing:.42em;font-size:14px;color:var(--gold-bright)}
#logo i{display:block;font-style:normal;font-size:8.5px;letter-spacing:.3em;opacity:.55;margin-top:3px}
nav a{color:rgba(216,201,163,.6);text-decoration:none;font-size:10px;letter-spacing:.32em;margin-left:30px;
  padding-bottom:4px;border-bottom:1px solid transparent;transition:all .3s}
nav a:hover,nav a.active{color:var(--gold-bright);border-color:var(--gold)}

#subject-tag{position:fixed;left:34px;bottom:30px;z-index:10;transition:opacity 1s;
  border-left:1px solid var(--line);padding-left:16px}
#subject-tag b{display:block;font-family:var(--serif);font-weight:400;letter-spacing:.4em;color:var(--gold-bright);font-size:13px}
#subject-tag i{display:block;font-style:normal;font-size:9px;letter-spacing:.34em;opacity:.6;margin-top:4px}
#fps-line{display:block;font-size:8.5px;letter-spacing:.25em;opacity:.5;margin-top:10px}
#fps-line em{font-style:normal;color:var(--gold)}

#controls{position:fixed;right:34px;bottom:30px;z-index:10;display:flex;flex-direction:column;
  align-items:flex-end;gap:10px;transition:opacity 1s}
.ctl{display:flex;align-items:center;gap:10px;background:rgba(8,7,4,.5);backdrop-filter:blur(6px);
  border:1px solid var(--line);color:rgba(216,201,163,.85);font-family:var(--mono);
  font-size:9.5px;letter-spacing:.38em;padding:10px 18px;cursor:pointer;transition:all .3s}
.ctl .ico{font-size:14px;color:var(--gold);transition:transform .5s}
.ctl:hover{border-color:var(--gold);color:var(--gold-bright);box-shadow:0 0 22px rgba(201,162,75,.15)}
.ctl:hover .ico{transform:rotate(90deg)}
.ctl.on{border-color:var(--gold);color:var(--gold-bright);background:rgba(201,162,75,.12)}
.ctl.icon-only{padding:10px 12px}
#controls .row{display:flex;gap:10px}

/* tooltip & panels */
#tooltip{position:fixed;z-index:15;pointer-events:none;font-size:9.5px;letter-spacing:.3em;
  color:var(--gold-bright);background:rgba(5,5,5,.85);border:1px solid var(--line);
  padding:7px 12px;transform:translate(14px,-50%);white-space:nowrap;transition:opacity .2s}
#info-panel{position:fixed;right:34px;top:50%;transform:translateY(-50%);z-index:12;width:280px;
  background:rgba(8,7,4,.82);backdrop-filter:blur(10px);border:1px solid var(--line);
  padding:26px;transition:opacity .5s;pointer-events:auto}
#info-panel i{font-style:normal;font-size:8.5px;letter-spacing:.4em;color:var(--gold)}
#info-panel h3{font-family:var(--serif);font-weight:400;letter-spacing:.22em;font-size:15px;
  color:var(--gold-bright);margin:10px 0 12px}
#info-panel p{font-size:10.5px;line-height:2;opacity:.75;letter-spacing:.06em}
#info-specs{margin-top:14px;border-top:1px solid var(--line);padding-top:12px;font-size:9px;letter-spacing:.15em;opacity:.65}
#info-specs div{margin-bottom:6px}
#info-hide{margin-top:16px;width:100%;background:none;border:1px solid var(--line);color:var(--champagne);
  font-family:var(--mono);font-size:9px;letter-spacing:.3em;padding:11px;cursor:pointer;
  display:flex;gap:8px;justify-content:center;align-items:center;transition:all .3s}
#info-hide .ico{font-size:12px}
#info-hide:hover{border-color:var(--gold);color:var(--gold-bright)}
#info-close,#specs-panel button{position:absolute;top:12px;right:14px;background:none;border:none;
  color:var(--champagne);opacity:.5;cursor:pointer;font-size:12px}
#info-close:hover{opacity:1}
#specs-panel{position:fixed;left:34px;top:50%;transform:translateY(-50%);z-index:12;width:320px;
  background:rgba(8,7,4,.82);backdrop-filter:blur(10px);border:1px solid var(--line);
  padding:26px;transition:opacity .5s;pointer-events:auto}
#specs-panel h3{font-family:var(--serif);font-weight:400;letter-spacing:.2em;font-size:13px;color:var(--gold-bright);margin-bottom:18px}
#specs-panel h3 span{color:var(--gold);opacity:.6}
#specs-panel li{list-style:none;display:flex;justify-content:space-between;gap:14px;
  border-bottom:1px solid rgba(201,162,75,.12);padding:9px 0;font-size:9px;letter-spacing:.14em}
#specs-panel b{color:var(--gold);font-weight:400;letter-spacing:.3em;white-space:nowrap}
#specs-panel i{font-style:normal;opacity:.72;text-align:right}

/* nav overlays */
#overlay-page{position:fixed;inset:0;z-index:14;background:rgba(3,3,2,.88);backdrop-filter:blur(14px);
  display:flex;align-items:center;justify-content:center;transition:opacity .5s;pointer-events:auto}
#overlay-page .content{max-width:620px;padding:40px;text-align:center}
#overlay-page h2{font-family:var(--serif);font-weight:400;letter-spacing:.5em;color:var(--gold-bright);
  font-size:clamp(1.1rem,3vw,1.7rem);margin-bottom:26px;padding-left:.5em}
#overlay-page p{font-size:11px;line-height:2.4;letter-spacing:.12em;opacity:.78}
#overlay-page .rule{height:1px;background:linear-gradient(90deg,transparent,var(--line),transparent);margin:26px 0}
#overlay-page button{background:none;border:1px solid var(--line);color:var(--gold-bright);font-family:var(--mono);
  font-size:10px;letter-spacing:.4em;padding:13px 30px;cursor:pointer;margin-top:10px;transition:all .3s}
#overlay-page button:hover{border-color:var(--gold);box-shadow:0 0 24px rgba(201,162,75,.2)}

@media(max-width:760px){
  nav a{margin-left:14px;font-size:8.5px;letter-spacing:.2em}
  #logo b{font-size:11px;letter-spacing:.3em}
  #controls{right:16px;bottom:20px;gap:7px}
  .ctl{padding:8px 12px;font-size:8px;letter-spacing:.2em}
  #subject-tag{left:16px;bottom:18px}
  #info-panel,#specs-panel{width:min(300px,86vw);right:12px;left:auto}
  #specs-panel{left:12px;top:auto;bottom:90px;transform:none}
}