:root{
  --ink:#eaf4fb;
  --ink-dim:rgba(234,244,251,.62);
  --ink-faint:rgba(234,244,251,.38);
  --panel:rgba(6,18,31,.58);
  --panel-line:rgba(127,212,255,.22);
  --accent:#7fd4ff;
  --gold:#e8b34a;
  --serif:Georgia,"Times New Roman",serif;
  --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --sans:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;
}
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;background:#06121f;color:var(--ink);
  font-family:var(--sans);overflow:hidden;
  overscroll-behavior:none;
}
#gl{position:fixed;inset:0;width:100%;height:100%;display:block;touch-action:none}
#vignette{
  position:fixed;inset:0;pointer-events:none;z-index:2;
  background:
    radial-gradient(120% 90% at 50% 42%, transparent 55%, rgba(2,8,16,.55) 100%),
    linear-gradient(to top, rgba(2,8,16,.5), transparent 26%);
}
.hud-top{
  position:fixed;top:0;left:0;right:0;z-index:5;
  display:flex;justify-content:space-between;align-items:flex-start;
  padding:calc(10px + env(safe-area-inset-top)) 14px 0;
  pointer-events:none;
}
.hud-top h1{
  margin:0;font-family:var(--serif);font-weight:400;letter-spacing:.34em;
  font-size:clamp(17px,2.6vw,24px);
  text-shadow:0 2px 18px rgba(0,0,0,.7);
}
.hud-top h1 .star{color:var(--gold);letter-spacing:0;margin-right:.35em}
.hud-top .sub{margin:2px 0 0;font-size:12px;color:var(--ink-dim);letter-spacing:.06em}
.badges{display:flex;gap:8px}
.badge{
  font-family:var(--mono);font-size:11px;color:var(--ink-dim);
  border:1px solid var(--panel-line);border-radius:999px;
  padding:4px 10px;background:var(--panel);white-space:nowrap;
}
#rail{
  position:fixed;z-index:5;right:10px;top:50%;transform:translateY(-50%);
  display:flex;flex-direction:column;gap:7px;align-items:center;
  max-height:70vh;
}
#rail button{
  width:26px;height:26px;border-radius:50%;border:1px solid var(--panel-line);
  background:var(--panel);color:var(--ink-faint);
  font-family:var(--mono);font-size:10px;cursor:pointer;padding:0;line-height:1;
}
#rail button[aria-current="true"]{
  background:var(--accent);border-color:var(--accent);color:#06121f;font-weight:700;
  box-shadow:0 0 14px rgba(127,212,255,.8);
}
#rail button.done{color:var(--accent)}
#caption{
  position:fixed;z-index:5;left:14px;right:64px;bottom:calc(64px + env(safe-area-inset-bottom));
  max-width:520px;pointer-events:none;
  text-shadow:0 2px 14px rgba(0,0,0,.8);
}
#stageKicker{
  margin:0 0 2px;font-family:var(--mono);font-size:11px;letter-spacing:.22em;
  text-transform:uppercase;color:var(--gold);
}
#stageTitle{margin:0;font-family:var(--serif);font-weight:400;font-size:clamp(26px,5vw,44px);line-height:1.02}
#stageLine{margin:6px 0 10px;font-family:var(--serif);font-style:italic;font-size:clamp(14px,2.4vw,18px);color:var(--ink)}
#prog{height:2px;background:rgba(234,244,251,.18);border-radius:2px;overflow:hidden;max-width:340px}
#progFill{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--accent),var(--gold))}
#hint{margin:8px 0 0;font-size:11.5px;color:var(--ink-dim)}
#controls{
  position:fixed;z-index:6;left:10px;right:10px;bottom:calc(10px + env(safe-area-inset-bottom));
  display:flex;gap:8px;align-items:center;flex-wrap:wrap;justify-content:center;
}
#controls button,.sun{
  font-family:var(--mono);font-size:11.5px;color:var(--ink);
  background:var(--panel);border:1px solid var(--panel-line);border-radius:999px;
  padding:8px 13px;cursor:pointer;backdrop-filter:blur(6px);
}
#controls button:hover{border-color:var(--accent)}
#controls button[aria-pressed="true"]{background:rgba(127,212,255,.22);border-color:var(--accent)}
.sun{display:flex;gap:8px;align-items:center}
.sun input{width:90px;accent-color:var(--gold)}
#intro{
  position:fixed;inset:0;z-index:20;display:flex;align-items:center;justify-content:center;
  padding:18px;background:rgba(2,8,16,.55);backdrop-filter:blur(8px);
  transition:opacity .6s ease;
}
#intro.hidden{opacity:0;pointer-events:none}
#intro .card{
  max-width:560px;max-height:88vh;overflow:auto;
  background:rgba(8,22,38,.92);border:1px solid var(--panel-line);border-radius:14px;
  padding:26px 26px 22px;box-shadow:0 24px 80px rgba(0,0,0,.6);
}
#intro .kicker{margin:0 0 8px;font-family:var(--mono);font-size:11px;letter-spacing:.24em;color:var(--gold);text-transform:uppercase}
#intro h2{margin:0 0 12px;font-family:var(--serif);font-weight:400;font-size:clamp(24px,5vw,34px);line-height:1.12}
#intro p{line-height:1.6;color:var(--ink);font-size:15px}
#intro .fine{font-size:12.5px;color:var(--ink-dim)}
#btnStart{
  display:block;width:100%;margin:16px 0 10px;padding:14px;
  font-family:var(--serif);font-size:19px;letter-spacing:.04em;
  color:#06121f;background:linear-gradient(135deg,var(--accent),#bfe9ff);
  border:none;border-radius:10px;cursor:pointer;
}
#btnStart:hover{filter:brightness(1.08)}
#method summary{cursor:pointer;font-family:var(--mono);font-size:12px;color:var(--accent)}
#method ul{margin:8px 0 0;padding-left:18px;font-size:12.5px;color:var(--ink-dim);line-height:1.6}
#toast{
  position:fixed;z-index:30;left:50%;bottom:110px;transform:translateX(-50%) translateY(8px);
  background:rgba(8,22,38,.92);border:1px solid var(--panel-line);border-radius:8px;
  padding:9px 16px;font-size:13px;opacity:0;transition:opacity .3s,transform .3s;pointer-events:none;
  max-width:min(90vw,420px);text-align:center;
}
#toast.show{opacity:1;transform:translateX(-50%) translateY(0)}
@media (max-width:640px){
  #rail{right:6px;gap:5px}
  #rail button{width:22px;height:22px;font-size:9px}
  #caption{right:44px;bottom:calc(108px + env(safe-area-inset-bottom))}
  #hint{display:none}
  .sun input{width:64px}
}
@media (prefers-reduced-motion:reduce){
  #intro{transition:none}
}