:root{
  --bg:#eef1f5; --paper:#fff; --ink:#16202e; --mute:#5b6676; --line:#cfd6e0;
  --brand:#16324f; --accent:#d9622b; --gas:#1f6fb2; --fuel:#2e8b57; --el:#7a4fb5; --drn:#8a94a3;
  --ok:#dff1dc; --warn:#fde6e1; --mid:#fff1c7;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.55 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif}
a{color:#1155cc}
header.top{background:var(--brand);color:#fff;position:sticky;top:0;z-index:50;box-shadow:0 1px 0 rgba(0,0,0,.2)}
.top .in{max-width:1280px;margin:0 auto;padding:10px 20px;display:flex;gap:18px;align-items:center;flex-wrap:wrap}
.brand{font-weight:700;letter-spacing:.2px;color:#fff;text-decoration:none;white-space:nowrap}
.brand small{display:block;font-weight:400;font-size:11px;opacity:.75;letter-spacing:.3px}
nav.main{display:flex;gap:2px;flex-wrap:wrap;margin-left:auto}
nav.main a{color:#dbe6f2;text-decoration:none;padding:6px 10px;border-radius:6px;font-size:13.5px;white-space:nowrap}
nav.main a:hover{background:rgba(255,255,255,.12);color:#fff}
nav.main a.on{background:#fff;color:var(--brand);font-weight:600}
main{max-width:1280px;margin:0 auto;padding:22px 20px 60px}
h1{font-size:26px;line-height:1.2;margin:6px 0 4px;text-wrap:balance}
h2{font-size:19px;margin:30px 0 10px}
h3{font-size:15.5px;margin:20px 0 6px}
.lead{color:var(--mute);margin:0 0 16px;max-width:900px}
.kpis{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:10px;margin:16px 0}
.kpi{background:var(--paper);border:1px solid var(--line);border-radius:10px;padding:12px 14px}
.kpi b{display:block;font-size:20px;font-variant-numeric:tabular-nums;line-height:1.2}
.kpi span{font-size:12.5px;color:var(--mute)}
.sheet{background:var(--paper);border:1.5px solid var(--ink);margin:14px 0 6px;position:relative}
.sheet svg{display:block;width:100%;height:auto}
.stamp{display:grid;grid-template-columns:1fr auto auto auto;border-top:1.5px solid var(--ink);font-size:12px}
.stamp div{padding:5px 10px;border-left:1px solid var(--ink)}
.stamp div:first-child{border-left:0;font-weight:600}
.hint{font-size:13px;color:var(--mute);margin:4px 0 14px}
.hint b{color:var(--accent)}
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:12px}
.card{background:var(--paper);border:1px solid var(--line);border-radius:10px;padding:14px 16px;text-decoration:none;color:inherit;display:block}
a.card:hover{border-color:var(--brand);box-shadow:0 2px 10px rgba(22,50,79,.12)}
.card h3{margin:0 0 4px}
.card p{margin:0;color:var(--mute);font-size:13.5px}
.tw{overflow-x:auto;background:var(--paper);border:1px solid var(--line);border-radius:10px;margin:10px 0}
table{border-collapse:collapse;width:100%;font-size:13.5px}
th,td{padding:7px 10px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
th{background:#f3f5f8;font-weight:600;white-space:nowrap;position:sticky;top:0}
tr:last-child td{border-bottom:0}
td.n,th.n{text-align:right;font-variant-numeric:tabular-nums;white-space:nowrap}
tr.tot td{font-weight:700;background:#f3f5f8}
tr.hl td{background:#fff6e0}
.tag{display:inline-block;font:600 11.5px/1 ui-monospace,SFMono-Regular,Menlo,monospace;background:#e6ecf4;color:var(--brand);border-radius:4px;padding:3px 6px;white-space:nowrap}
.pill{display:inline-block;border-radius:20px;padding:1px 9px;font-size:12px;font-weight:600}
.pill.ok{background:var(--ok)} .pill.mid{background:var(--mid)} .pill.warn{background:var(--warn)}
.note{background:#fff8e6;border:1px solid #ecd9a0;border-radius:10px;padding:10px 14px;font-size:13.5px;margin:12px 0}
.note.red{background:var(--warn);border-color:#f0b9ae}
.formula{font:13px/1.5 ui-monospace,SFMono-Regular,Menlo,monospace;background:#f3f5f8;border-radius:8px;padding:8px 12px;margin:8px 0;overflow-x:auto;white-space:pre}
ol.steps{counter-reset:s;list-style:none;padding:0;margin:10px 0}
ol.steps li{counter-increment:s;position:relative;padding:8px 12px 8px 46px;background:var(--paper);border:1px solid var(--line);border-radius:10px;margin:6px 0}
ol.steps li:before{content:counter(s);position:absolute;left:12px;top:8px;width:24px;height:24px;border-radius:50%;background:var(--brand);color:#fff;font-weight:700;font-size:13px;display:grid;place-items:center}
.two{display:grid;grid-template-columns:1fr 1fr;gap:18px}
@media(max-width:900px){.two{grid-template-columns:1fr} nav.main{margin-left:0}}
footer{max-width:1280px;margin:0 auto;padding:0 20px 40px;color:var(--mute);font-size:12.5px}
.filters{display:flex;gap:8px;flex-wrap:wrap;margin:10px 0}
.filters input,.filters select{font:inherit;padding:7px 10px;border:1px solid var(--line);border-radius:8px;background:#fff;min-width:200px}

/* ---------- drawings ---------- */
svg text{font-family:-apple-system,"Segoe UI",Roboto,Arial,sans-serif;fill:var(--ink)}
.t9{font-size:9px}.t10{font-size:10px}.t11{font-size:11px}.t12{font-size:12px}.t14{font-size:14px;font-weight:600}
.tm{fill:var(--mute)!important}
.ln{fill:none;stroke:var(--ink);stroke-width:1.6}
.thin{fill:none;stroke:var(--ink);stroke-width:1}
.dim{fill:none;stroke:#7b8696;stroke-width:.8}
.dimt{font-size:10px;fill:#56606e!important}
.gas{fill:none;stroke:var(--gas);stroke-width:3.2;stroke-linejoin:round}
.fuel{fill:none;stroke:var(--fuel);stroke-width:2.2;stroke-linejoin:round}
.drn{fill:none;stroke:var(--drn);stroke-width:1.6;stroke-dasharray:7 4}
.vent{fill:none;stroke:var(--drn);stroke-width:1.6}
.el{fill:none;stroke:var(--el);stroke-width:1.1;stroke-dasharray:5 4}
.box{fill:none;stroke:var(--ink);stroke-width:1.2;stroke-dasharray:10 6}
.fillw{fill:#fff}.fillg{fill:#e8edf3}.fillh{fill:#f6d9c9}.filli{fill:#f3e7b8}
.flame{fill:#f6a15b;opacity:.55;stroke:#d9622b;stroke-width:1}
.heat{fill:none;stroke:#c0392b;stroke-width:1.4}
.zone{fill:none;stroke:#c0392b;stroke-width:1;stroke-dasharray:6 5}
.c{cursor:pointer;outline:none}
.c .hit{fill:transparent;stroke:none}
.c:hover .sh,.c.on .sh,.c:focus .sh{stroke:var(--accent)!important;stroke-width:2.6}
.c:hover .shf,.c.on .shf,.c:focus .shf{fill:#ffe9d9!important}
.c:hover text,.c.on text{fill:var(--accent)!important}

/* ---------- tooltip ---------- */
#tip{position:fixed;z-index:100;width:340px;max-width:calc(100vw - 24px);background:#fff;border:1px solid var(--brand);border-radius:12px;box-shadow:0 10px 34px rgba(16,30,50,.25);padding:12px 14px;font-size:13px;display:none;pointer-events:none}
#tip.pin{pointer-events:auto}
#tip h4{margin:6px 0 6px;font-size:15px;line-height:1.25}
#tip dl{display:grid;grid-template-columns:auto 1fr;gap:3px 10px;margin:6px 0}
#tip dt{color:var(--mute);white-space:nowrap}
#tip dd{margin:0}
#tip .buy{margin-top:8px;padding-top:8px;border-top:1px solid var(--line)}
#tip .pr{font-weight:700}
#tip .nt{margin-top:6px;color:#8a4b1c;background:#fff4e6;border-radius:6px;padding:5px 8px}
#tip .x{position:absolute;right:8px;top:6px;border:0;background:none;font-size:18px;cursor:pointer;color:var(--mute);display:none}
#tip.pin .x{display:block}