:root{
  --bg:#f4f7f8;--card:#fff;--ink:#14232b;--muted:#5a6b73;--line:#d6e0e4;
  --brand:#0f5c6e;--brand-2:#1489a3;--brand-soft:#e3f2f6;
  --fill:#4fb3c9;--warn:#8a5a00;--warn-bg:#fff4d6;--danger:#9b1c1c;--danger-bg:#fde8e8;
  --radius:14px;--focus:0 0 0 3px #ffbf47;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;font:17px/1.5 system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;background:var(--bg);color:var(--ink)}
.wrap{max-width:760px;margin:0 auto;padding:0 16px}
.skip{position:absolute;left:-999px;top:0;background:#000;color:#fff;padding:8px 12px;z-index:9}
.skip:focus{left:8px}
h2{font-size:1.2rem;margin:0 0 .4rem}
h3{font-size:1.02rem;margin:0 0 .2rem}
p{margin:.3rem 0}
.muted{color:var(--muted)}
.hint{color:var(--muted);font-size:.92rem;margin:0 0 .5rem}
.opt{font-weight:400;color:var(--muted);font-size:.9rem}

.site-header{background:var(--brand);color:#fff;padding:14px 0}
.header-inner{display:flex;align-items:center;gap:12px}
.logo{width:40px;height:40px;color:#fff;flex:none}
.brand{font-size:1.45rem;font-weight:800;letter-spacing:-.01em;margin:0;line-height:1.1}
.tagline{margin:0;opacity:.85;font-size:.92rem}

.disclaimer{margin:14px 0 4px;background:var(--warn-bg);border:1px solid #f0d58a;border-radius:var(--radius);padding:12px 14px;font-size:.93rem}

.tabs{display:grid;grid-template-columns:1fr 1fr;gap:6px;background:#dde7ea;border-radius:var(--radius);padding:5px;margin:14px 0}
.tabs button{font:inherit;font-weight:700;border:0;background:transparent;color:var(--ink);padding:12px 8px;border-radius:10px;cursor:pointer;min-height:48px}
.tabs button[aria-selected="true"]{background:#fff;color:var(--brand);box-shadow:0 1px 3px rgba(0,0,0,.12)}

.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:18px 16px;margin:0 0 14px}
.lead{margin:0 0 12px}
.field{margin:0 0 18px;border:0;padding:0}
.field:last-child{margin-bottom:0}
.field > label,.field legend{display:block;font-weight:700;font-size:1.05rem;margin-bottom:2px;padding:0}
.field legend{margin-bottom:8px}
.input-row{display:flex;gap:8px;align-items:stretch}
input[type=number]{flex:1;min-width:0;font:inherit;font-size:1.35rem;font-weight:600;padding:10px 14px;min-height:56px;border:2px solid var(--line);border-radius:12px;background:#fff;color:var(--ink)}
input[type=number]:focus{outline:none;border-color:var(--brand-2);box-shadow:var(--focus)}
input[aria-invalid="true"]{border-color:var(--danger)}
.suffix{display:flex;align-items:center;padding:0 14px;font-weight:700;color:var(--muted);background:#eef3f5;border-radius:12px;min-width:76px;justify-content:center}

.seg{display:flex;background:#eef3f5;border-radius:12px;padding:4px;gap:4px}
.seg label{position:relative;display:flex}
.seg input{position:absolute;opacity:0;inset:0;margin:0;cursor:pointer}
.seg span{display:flex;flex-direction:column;align-items:center;justify-content:center;min-width:58px;min-height:48px;padding:4px 12px;border-radius:9px;font-weight:700;color:var(--muted);line-height:1.15}
.seg small{font-weight:500;font-size:.78rem}
.seg input:checked + span{background:var(--brand);color:#fff}
.seg input:focus-visible + span{box-shadow:var(--focus)}
.seg-wide label{flex:1}.seg-wide span{width:100%}

.presets{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 8px}
.chip{font:inherit;font-weight:700;border:2px solid var(--line);background:#fff;color:var(--ink);border-radius:999px;padding:8px 16px;min-height:44px;cursor:pointer}
.chip[aria-pressed="true"]{border-color:var(--brand);background:var(--brand-soft);color:var(--brand)}
.chip:focus-visible,.tabs button:focus-visible{outline:none;box-shadow:var(--focus)}

.results{border-color:#9fd0dc;background:linear-gradient(#fff,#f7fcfd)}
.stats{display:grid;grid-template-columns:1fr;gap:10px;margin:8px 0 0}
.stats > div{background:var(--brand-soft);border-radius:12px;padding:10px 14px}
.stats dt{font-size:.85rem;color:var(--muted);font-weight:600}
.stats dd{margin:0;font-size:1.35rem;font-weight:800;color:var(--brand)}
.stats dd.sub{font-size:.9rem;font-weight:600;color:var(--muted)}

.draw-answer{text-align:center;margin:16px 0 6px}
.draw-lead{margin:0;color:var(--muted)}
.draw-big{font-size:3rem;font-weight:900;color:var(--brand);margin:0;line-height:1.05;text-align:center}
.draw-big .u{font-size:1.3rem;font-weight:700}
.draw-ml{font-size:1.2rem;font-weight:700;margin:2px 0 6px}
.draw-doses{font-size:.95rem;margin:0}
.syringe-wrap{margin:8px -4px 6px;overflow:hidden}
.syringe{width:100%;height:auto;display:block}
.syringe text{font:700 18px system-ui,sans-serif;fill:var(--muted)}
.syringe .major{font-size:19px;fill:var(--ink)}

.alert{border-radius:12px;padding:10px 14px;margin:10px 0 0;font-size:.95rem;border:1px solid}
.alert strong{display:block}
.alert.warn{background:var(--warn-bg);border-color:#f0d58a;color:#4d3500}
.alert.danger{background:var(--danger-bg);border-color:#f3b4b4;color:#5f1010}

.table-scroll{overflow-x:auto}
table.ref{width:100%;border-collapse:collapse;font-variant-numeric:tabular-nums}
.ref th,.ref td{padding:9px 10px;text-align:right;border-bottom:1px solid var(--line);white-space:nowrap}
.ref th:first-child,.ref td:first-child{text-align:left}
.ref thead th{font-size:.85rem;color:var(--muted);font-weight:700}
.ref tbody th{font-weight:700}
.ref tr.over td{color:#b0bcc1}
.ref tr.over td:last-child::after{content:" ⓘ";}
.ref tr.hl{background:var(--brand-soft)}
.grid td b{color:var(--brand)}

.steps{list-style:none;margin:10px 0 0;padding:0;counter-reset:s}
.steps > li{flex-wrap:wrap;display:flex;gap:14px;align-items:flex-start;padding:12px 0;border-top:1px solid var(--line);counter-increment:s}
.steps > li:first-child{border-top:0}
.steps > li > svg{width:64px;height:64px;flex:none;background:var(--brand-soft);border-radius:14px;padding:6px}
.steps h3::before{content:counter(s) ". ";color:var(--brand)}
.steps p{margin:0;font-size:.97rem}
.s-glass{fill:#fff;stroke:var(--brand);stroke-width:2.5}
.s-cap{fill:var(--brand)}
.s-swab{fill:#fff;stroke:var(--brand-2);stroke-width:2;stroke-dasharray:3 2}
.s-line,.s-arrow{stroke:var(--brand);stroke-width:2.5;fill:none;stroke-linecap:round;stroke-linejoin:round}
.s-needle{stroke:var(--muted);stroke-width:2}
.s-barrel{fill:#fff;stroke:var(--brand);stroke-width:2}
.s-drip{stroke:var(--fill);stroke-width:3;fill:none;stroke-linecap:round}
.s-fridge{fill:#fff;stroke:var(--brand);stroke-width:2.5}
.s-label{fill:var(--warn-bg);stroke:#c79a2b;stroke-width:1.5}
.s-dot{fill:#a3773a}
.s-x{stroke:var(--danger);stroke-width:3.5;stroke-linecap:round}

.how ul{padding-left:1.1rem;margin:.4rem 0}
.how li{margin:.2rem 0}

.site-footer{padding:10px 0 40px;font-size:.88rem;color:var(--muted)}

@media (min-width:700px){
  body{font-size:17.5px}
  .wrap{padding:0 24px}
  .card{padding:22px 24px}
  .stats{grid-template-columns:repeat(3,1fr)}
  #panel-rev .stats{grid-template-columns:repeat(2,1fr)}
  .draw-big{font-size:3.6rem}
}
@media (min-width:1100px){
  .wrap{max-width:1040px}
  #panel-fwd{display:grid;grid-template-columns:1fr 1fr;gap:0 16px;align-items:start}
  #panel-fwd[hidden]{display:none}
  #panel-fwd > .card:last-child{grid-column:1 / -1}
  #panel-fwd .stats{grid-template-columns:1fr}
  #panel-rev:not([hidden]){display:grid;grid-template-columns:1fr 1fr;gap:0 16px;align-items:start}
  #panel-rev .stats{grid-template-columns:1fr}
}
@media (prefers-reduced-motion:no-preference){.syringe .fill{transition:width .25s ease}}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.presets{display:grid;grid-template-columns:repeat(4,1fr)}
.presets .chip{padding:8px 4px}
#panel-rev .presets{grid-template-columns:repeat(5,1fr)}
.tip{display:flex;gap:10px;align-items:flex-start;margin:0 0 2px;background:var(--warn-bg);border:1px solid #f0d58a;border-left:5px solid #c79a2b;border-radius:12px;padding:10px 12px;font-size:.93rem}
.tip svg{width:32px;height:32px;flex:none;margin-top:2px}
.steps > li > div{flex:1;min-width:0}
.steps > li > .tip{flex-basis:100%}
.tip .tip-title{font-weight:800;margin:0 0 2px;color:#4d3500}
.tip p{font-size:.93rem}
.tip ul{margin:6px 0 0;padding-left:1.05rem;list-style:disc}
.tip li{margin:3px 0;display:list-item;padding:0;border:0}
.t-ring{fill:#fff;stroke:#c79a2b;stroke-width:2.5}
.t-arc{fill:none;stroke:#c79a2b;stroke-width:2;stroke-linecap:round;stroke-dasharray:2 2.5}
.t-needle{stroke:#9b1c1c;stroke-width:2.5;stroke-linecap:round}
.t-hub{fill:#4d3500}
.video .video-frame{display:flex;justify-content:center;margin-top:8px}
.video video{display:block;width:100%;background:#0b1e24;border-radius:12px;aspect-ratio:9/16;max-width:min(100%,calc(62vh * 9 / 16));height:auto}
.video video.is-wide{aspect-ratio:16/9;max-width:720px}
.video-fallback{margin-top:8px;text-align:center}