:root{
--paper:oklch(0.97 0.012 42);--paper2:oklch(0.99 0.008 42);--ink:oklch(0.28 0.04 38);
--muted:oklch(0.45 0.03 42);--line:oklch(0.86 0.02 42);--clay:oklch(0.52 0.12 42);
--clayh:oklch(0.46 0.13 42);--clayink:oklch(0.98 0.01 42);--sand:oklch(0.78 0.08 72);
--gravel:oklch(0.62 0.09 48);--rock:oklch(0.48 0.04 70);--danger:oklch(0.5 0.14 25);
--glass:oklch(0.93 0.02 220);--water:oklch(0.91 0.03 210);--r:.375rem;--ease:cubic-bezier(0.16,1,0.3,1);
--f:ui-sans-serif,system-ui,"Segoe UI",sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
body{margin:0;min-height:100dvh;font:1rem/1.45 var(--f);color:var(--ink);background:var(--paper)}
h1,h2,p{margin:0;font-weight:600}
h1{font-size:1.424rem;max-width:22ch;line-height:1.2}
h2{font-size:1.125rem}
button,input{font:inherit}
.skip{position:absolute;left:.75rem;top:-3rem;z-index:10;padding:.5rem .75rem;background:var(--ink);color:var(--paper2);text-decoration:none}
.skip:focus{top:.75rem}
.mast,.stage,.colophon{width:min(68rem,calc(100% - 2rem));margin-inline:auto}
.mast{padding:3rem 0 1.5rem;display:grid;gap:.75rem}
.mast__mark{font-size:.79rem;letter-spacing:.16em;text-transform:uppercase;color:var(--clay)}
.mast__lede{max-width:46ch;color:var(--muted)}
.stage{display:grid;gap:2rem;align-items:start;padding-bottom:3rem}
@media(min-width:50rem){.stage{grid-template-columns:minmax(0,1fr) minmax(18rem,.9fr);gap:3rem}}
.instrument{display:grid;gap:1.5rem}
.cluster{margin:0;padding:0;border:0;display:grid;gap:.75rem}
.cluster legend{padding:0;margin-bottom:.75rem;font-size:.89rem;font-weight:600}
@media(min-width:36rem){.cluster--dims{grid-template-columns:repeat(3,minmax(0,1fr))}.cluster--dims legend{grid-column:1/-1;margin-bottom:0}}
.field{display:grid;gap:.5rem}
.field label,.presets__save label{font-size:.89rem;font-weight:500}
.field__control{display:grid;grid-template-columns:1fr auto;border:1px solid var(--line);border-radius:var(--r);background:var(--paper2);min-height:2.75rem}
.field.is-invalid .field__control{border-color:var(--danger)}
.field__control:focus-within{border-color:var(--clay);outline:2px solid var(--clay);outline-offset:3px}
.field.is-invalid .field__control:focus-within{outline-color:var(--danger)}
.field__control input{border:0;background:transparent;padding:.55rem .75rem;color:var(--ink);min-width:0;outline:none}
.unit{display:grid;place-items:center;padding-inline:.75rem;color:var(--muted);font-size:.89rem;border-left:1px solid var(--line)}
.choices{display:grid;gap:.5rem}
@media(min-width:36rem){.choices{grid-template-columns:repeat(3,minmax(0,1fr))}}
.choice{display:grid;grid-template-columns:auto 1fr;gap:.65rem;padding:.7rem .75rem;border:1px solid var(--line);border-radius:var(--r);background:var(--paper2);cursor:pointer;min-height:2.75rem}
.choice span{display:grid;gap:.1rem}
.choice strong{font-size:.89rem}
.choice span span{font-size:.79rem;color:var(--muted)}
.choice:has(input:checked){border-color:var(--clay);background:oklch(0.96 0.02 42)}
.choice input{margin-top:.2rem;accent-color:var(--clay)}
.form-error{margin:0;color:var(--danger);font-size:.89rem}
.presets{display:grid;gap:.75rem;padding-top:1rem;border-top:1px solid var(--line)}
.presets__head{display:flex;justify-content:space-between;gap:.75rem;align-items:baseline}
.presets__count{font-size:.79rem;color:var(--muted)}
.presets__save{display:grid;gap:.5rem}
.presets__row{display:grid;grid-template-columns:1fr auto;gap:.5rem}
@media(max-width:35.99rem){.presets__row{grid-template-columns:1fr}}
#preset-name,#save-preset,.preset-list button{min-height:2.75rem}
#preset-name{width:100%;border:1px solid var(--line);border-radius:var(--r);background:var(--paper2);padding:.55rem .75rem}
#save-preset{border:0;border-radius:var(--r);padding-inline:1rem;background:var(--clay);color:var(--clayink);font-weight:600;cursor:pointer}
#save-preset:hover:not(:disabled){background:var(--clayh)}
#save-preset:disabled{opacity:.45;cursor:not-allowed}
.hint{font-size:.79rem;color:var(--muted);min-height:1.1em}
.banner{padding:.65rem .75rem;border-radius:var(--r);background:oklch(0.94 0.03 70);font-size:.89rem}
.preset-list{list-style:none;margin:0;padding:0;display:grid;gap:.5rem}
.preset-list:empty::after{content:"Save a tank to switch back without retyping.";color:var(--muted);font-size:.89rem}
.preset{display:grid;gap:.5rem;padding:.7rem .75rem;border:1px solid var(--line);border-radius:var(--r);background:var(--paper2)}
.preset.is-active{border-color:var(--clay)}
.preset__main{display:flex;justify-content:space-between;gap:.5rem;align-items:start}
.preset__meta{font-size:.79rem;color:var(--muted)}
.preset__actions,.preset__confirm{display:flex;flex-wrap:wrap;gap:.5rem;align-items:center}
.preset__actions button,.preset__confirm button{border:1px solid var(--line);background:transparent;border-radius:var(--r);padding:.35rem .7rem;cursor:pointer}
.preset__confirm button[data-act="yes"]{border-color:var(--danger);color:var(--danger)}
.slip{display:grid;gap:1.5rem;padding:1.5rem;border:1px solid var(--line);border-radius:.75rem;background:var(--paper2)}
.tank__glass{position:relative;height:16rem;border:3px solid oklch(0.72 0.02 220);border-bottom-width:8px;background:var(--glass);overflow:hidden}
.tank__water{position:absolute;inset:0;background:linear-gradient(180deg,oklch(0.95 0.02 210/.2),var(--water))}
.tank__bed{position:absolute;left:0;right:0;bottom:0;height:100%;transform:scaleY(var(--fill,0));transform-origin:bottom;transition:transform 180ms var(--ease)}
.tank__bed[data-substrate="sand"]{background:var(--sand)}
.tank__bed[data-substrate="gravel"]{background:var(--gravel)}
.tank__bed[data-substrate="rock"]{background:var(--rock)}
.tank__tick{position:absolute;right:.5rem;z-index:2;font-size:.79rem;color:oklch(0.35 0.03 40);font-variant-numeric:tabular-nums}
.tank__tick--top{top:.4rem}
.tank__tick--bed{bottom:.5rem}
.tank__caption,.ticket__idle,.ticket__detail,.ticket__note,.colophon{font-size:.89rem;color:var(--muted)}
.ticket{display:grid;gap:.75rem;padding-top:1rem;border-top:1px dashed var(--line)}
.ticket__kicker{font-size:.79rem;letter-spacing:.14em;text-transform:uppercase;color:var(--clay)}
.ticket__need{display:flex;flex-wrap:wrap;align-items:baseline;gap:.4rem .6rem}
.ticket__bags{font-size:2.25rem;font-weight:650;font-variant-numeric:tabular-nums;line-height:1}
.ticket__bags-label{font-size:1.125rem}
.ticket__weights{display:grid;grid-template-columns:1fr 1fr;gap:1rem;margin:0}
.ticket__weights dt{font-size:.79rem;color:var(--muted)}
.ticket__weights dd{margin:.15rem 0 0;font-variant-numeric:tabular-nums;font-weight:600}
.ticket__note{color:var(--danger)}
.colophon{padding:0 0 3rem;max-width:62ch}
.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
:focus-visible{outline:2px solid var(--clay);outline-offset:3px}
@media(prefers-reduced-motion:reduce){.tank__bed,#save-preset{transition:none}}