*,*::before,*::after{box-sizing:border-box}
body{margin:0}
[hidden]{display:none!important}

/* ─────────────────────────────────────────────────────────────
   SYNTWORK · "A Journey into the Present"
   Art direction: Cooling Matter. Single dark world by design.
   --hue is set per chapter.
   ───────────────────────────────────────────────────────────── */
:root{
  color-scheme: dark;
  --void:#05060A;
  --bone:#ECE6DA;
  --dim:#948FA0;
  --line:rgba(236,230,218,.16);
  --glass:rgba(8,9,14,.55);
  --hue:#FFF1DC;
  --serif:"Instrument Serif","Iowan Old Style","Palatino Linotype",Georgia,serif;
  --mono:"IBM Plex Mono",ui-monospace,"SF Mono",Menlo,Consolas,monospace;
}
html,body{height:100%;overflow:hidden;background:var(--void);color:var(--bone)}
body{font-family:var(--mono);font-size:13px;-webkit-font-smoothing:antialiased;overscroll-behavior:none;-webkit-tap-highlight-color:transparent;user-select:none;-webkit-user-select:none}
#gl{position:fixed;inset:0;width:100%;height:100%;display:block;touch-action:none;outline:none}
button{font:inherit;color:inherit}
button:focus-visible{outline:1px solid var(--bone);outline-offset:3px}

.top{position:fixed;top:0;left:0;right:0;z-index:8;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:12px;
  padding:calc(env(safe-area-inset-top,0px) + 16px) 16px 0;pointer-events:none}
.top>*{pointer-events:auto}
.mark{font-size:11px;font-weight:500;letter-spacing:.34em;text-transform:uppercase;white-space:nowrap}
.mark span{color:var(--dim);font-weight:400;letter-spacing:.2em;margin-left:.6em}
.tools{display:flex;gap:8px;justify-content:flex-end}
.iconbtn{height:40px;min-width:40px;padding:0 12px;border:1px solid var(--line);background:var(--glass);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);
  display:flex;align-items:center;justify-content:center;gap:8px;cursor:pointer;font-size:10px;letter-spacing:.2em;text-transform:uppercase;border-radius:20px}
.iconbtn svg{width:16px;height:16px;stroke:currentColor;fill:none;stroke-width:1.4}
.iconbtn.off{color:var(--dim)}
#date{font-size:12px;letter-spacing:.3em;color:var(--hue);font-variant-numeric:tabular-nums;opacity:0;transition:opacity .8s, color .8s;white-space:nowrap}
#date.on{opacity:1}
@media (max-width:620px){.mark span{display:none}.iconbtn.opt{display:none}}

#gate{position:fixed;inset:0;z-index:12;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:22px;text-align:center;padding-inline:24px;transition:opacity 1.2s ease}
#gate.gone{opacity:0;pointer-events:none}
.eyebrow{font-size:11px;letter-spacing:.32em;text-transform:uppercase;color:var(--dim)}
#gate h1{font-family:var(--serif);font-weight:400;font-size:clamp(48px,10vw,124px);line-height:.92;letter-spacing:-.015em;margin:0;text-wrap:balance;text-shadow:0 0 60px rgba(5,6,10,.9)}
#gate h1 em{font-style:italic}
.gate-sub{color:var(--dim);max-width:36ch;line-height:1.6;margin:0}
.gate-actions{display:flex;flex-direction:column;align-items:center;gap:10px;margin-top:6px}
.btn{font:500 12px var(--mono);letter-spacing:.24em;text-transform:uppercase;color:var(--void);background:var(--bone);border:0;padding:17px 28px;cursor:pointer;transition:transform .2s, box-shadow .3s}
.btn:hover{box-shadow:0 0 40px -6px var(--bone);transform:translateY(-1px)}
.btn.ghost{background:none;color:var(--dim);letter-spacing:.18em;padding:10px;font-size:11px}
.btn.ghost:hover{color:var(--bone);box-shadow:none}

#arrival{position:fixed;left:0;right:0;top:calc(env(safe-area-inset-top,0px) + 11vh);z-index:5;text-align:center;pointer-events:none;padding-inline:16px;
  opacity:0;transform:translateY(12px);transition:opacity .9s ease, transform 1.4s cubic-bezier(.2,.7,.2,1)}
#arrival.show{opacity:1;transform:none}
#arrival .idx{font-size:11px;letter-spacing:.32em;color:var(--dim)}
#arrival .name{font-family:var(--serif);font-size:clamp(40px,7.5vw,92px);line-height:1;margin:.12em 0 .18em;text-wrap:balance;text-shadow:0 0 50px rgba(5,6,10,.95)}
#arrival .sub{font-size:11px;letter-spacing:.24em;text-transform:uppercase;color:var(--hue)}

#cap{position:fixed;left:50%;bottom:calc(env(safe-area-inset-bottom,0px) + 104px);z-index:6;width:min(40rem,calc(100% - 32px));
  transform:translate(-50%,8px);opacity:0;transition:opacity .45s, transform .6s cubic-bezier(.2,.7,.2,1);pointer-events:none;text-align:center}
#cap.show{opacity:1;transform:translate(-50%,0)}
#cap.hidden-by-user{display:none}
#cap p{font-family:var(--serif);font-size:clamp(22px,3vw,30px);line-height:1.18;margin:0;text-wrap:balance;
  text-shadow:0 2px 30px rgba(5,6,10,1),0 0 14px rgba(5,6,10,.9)}
#cap .vo{display:inline-block;margin-top:10px;font-size:9px;letter-spacing:.16em;text-transform:uppercase;color:var(--dim);border:1px solid var(--line);padding:3px 8px;border-radius:10px}
#cap .vo.ph{color:var(--hue);border-color:var(--hue)}

#contact{position:fixed;left:50%;bottom:calc(env(safe-area-inset-bottom,0px) + 104px);z-index:6;width:min(30rem,calc(100% - 32px));transform:translate(-50%,10px);
  text-align:center;opacity:0;pointer-events:none;transition:opacity .9s, transform .9s}
#contact.show{opacity:1;transform:translate(-50%,0);pointer-events:auto}
#contact .big{font-family:var(--serif);font-size:clamp(34px,5.5vw,64px);line-height:1;margin:0 0 18px;text-wrap:balance}
#contact .big em{font-style:italic}
.mail{display:inline-flex;align-items:center;border:1px solid var(--line);background:var(--glass);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);border-radius:24px;overflow:hidden}
.mail span{padding:12px 16px;letter-spacing:.08em;user-select:text;-webkit-user-select:text}
.mail button{border:0;border-left:1px solid var(--line);background:none;padding:12px 16px;cursor:pointer;font-size:10px;letter-spacing:.2em;text-transform:uppercase;color:var(--hue)}

.bar{position:fixed;left:0;right:0;bottom:0;z-index:7;display:grid;grid-template-columns:auto 1fr auto;align-items:end;gap:12px;
  padding:0 16px calc(env(safe-area-inset-bottom,0px) + 16px);opacity:0;pointer-events:none;transition:opacity .9s}
.bar.on{opacity:1;pointer-events:auto}
.bar.dim{opacity:.35;pointer-events:none}
.navbtn{height:52px;min-width:52px;padding:0 18px;border:1px solid var(--line);background:var(--glass);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);
  border-radius:26px;display:flex;align-items:center;justify-content:center;gap:10px;cursor:pointer;font-size:11px;letter-spacing:.22em;text-transform:uppercase;transition:border-color .4s, box-shadow .4s, color .4s}
.navbtn svg{width:18px;height:18px;stroke:currentColor;fill:none;stroke-width:1.4}
.navbtn .to{color:var(--dim);letter-spacing:.12em;text-transform:none;font-size:11px}
#nextBtn:not(.ready){color:var(--dim)}
.navbtn.ready{border-color:var(--hue);color:var(--bone);box-shadow:0 0 0 1px var(--hue) inset,0 0 36px -8px var(--hue);animation:ready 2.2s ease-in-out infinite}
@keyframes ready{50%{box-shadow:0 0 0 1px var(--hue) inset,0 0 54px -2px var(--hue)}}
.where{display:flex;flex-direction:column;align-items:center;gap:8px;min-width:0;padding-bottom:4px}
.where .n{font-family:var(--serif);font-size:21px;line-height:1;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:100%}
.track{display:flex;gap:2px}
.tk{width:30px;height:22px;border:0;background:none;padding:0;cursor:pointer;display:grid;place-items:center;position:relative}
.tk::after{content:"";width:16px;height:2px;background:var(--line);transition:background .4s,width .4s}
.tk.here::after{background:var(--hue);width:24px}
.tk.done::after{background:var(--dim)}
.tk .tip{position:absolute;bottom:26px;left:50%;transform:translateX(-50%);font-size:9px;letter-spacing:.14em;color:var(--dim);white-space:nowrap;opacity:0;transition:opacity .2s;pointer-events:none}
.tk:hover .tip,.tk:focus-visible .tip{opacity:1}
.prog{width:120px;height:2px;background:var(--line);position:relative;overflow:hidden}
.prog i{position:absolute;inset:0 auto 0 0;width:0;background:var(--hue);transition:width .6s}
@media (max-width:620px){.navbtn .to{display:none}.navbtn{padding:0 16px}.tk{width:24px}}

#flash{position:fixed;inset:0;z-index:9;pointer-events:none;opacity:0;background:radial-gradient(circle at 50% 50%,#fff 0%,var(--hue) 30%,rgba(5,6,10,0) 75%);mix-blend-mode:screen}

#notes{position:fixed;top:0;right:0;bottom:0;z-index:20;width:min(460px,100%);background:rgba(8,9,14,.97);border-left:1px solid var(--line);overflow-y:auto;
  padding:calc(env(safe-area-inset-top,0px) + 20px) 24px calc(env(safe-area-inset-bottom,0px) + 32px);user-select:text;-webkit-user-select:text}
#notes header{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px}
#notes h2{font-family:var(--serif);font-weight:400;font-size:34px;margin:0}
#notes h3{font-size:10px;letter-spacing:.28em;text-transform:uppercase;color:var(--dim);font-weight:500;margin:30px 0 12px}
#notes p,#notes li{line-height:1.6;color:#CFC9BD;font-size:12.5px;margin:0 0 8px;max-width:62ch}
#notes ul{padding-left:0;list-style:none;margin:0}
#notes code{font-size:11.5px;color:var(--bone);background:rgba(236,230,218,.07);padding:1px 5px;border-radius:3px;word-break:break-all}
.vo-sys{margin-bottom:18px}
.vo-sys b{font-family:var(--serif);font-weight:400;font-size:19px;display:block;margin-bottom:6px}
.vo-sys b small{font-family:var(--mono);font-size:10px;letter-spacing:.16em;color:var(--dim);margin-left:8px}
.vo-sys li{padding-left:12px;border-left:1px solid var(--line)}
.vo-sys li code{display:block;margin-bottom:2px;background:none;padding:0;color:var(--dim);font-size:10.5px}

@media (prefers-reduced-motion: reduce){ .navbtn.ready{animation:none} }