@import url("https://fonts.googleapis.com/css2?family=Roboto:wght@400;500;700&family=Roboto+Mono:wght@400;500;600&display=swap");
#ba-app{--ba-ink:#161616;--ba-mute:#5e5e5e;--ba-line:#e8e8e8;--ba-bg:#fff;--ba-soft:#f9f6ef;--ba-accent:#ae1f25;--ba-accent-ink:#fff;--ba-pass:#2f7d4f;--ba-warn:#b86e00;--ba-fail:#8f1a1f;--ba-info:#3a6ea5;--ba-env:#cfeedd;
  font-family:Roboto,"Noto Sans Bengali",system-ui,-apple-system,"Segoe UI",sans-serif;color:var(--ba-ink);line-height:1.5;max-width:none;margin:0;font-size:15px;width:100%;padding-inline:var(--ba-gutter,clamp(16px,2.2vw,30px))}
#ba-app *{box-sizing:border-box}
#ba-app .ba-head h2{margin:0 0 2px;font-size:1.5rem}
#ba-app .ba-head p{margin:0 0 14px;color:var(--ba-mute)}
.ba-steps{list-style:none;display:flex;gap:4px;padding:0;margin:0 0 14px;overflow-x:auto}
.ba-steps li{flex:1;min-width:92px}
.ba-steps button{width:100%;display:flex;align-items:center;gap:8px;border:0;border-bottom:3px solid var(--ba-line);background:none;padding:8px 4px;font:inherit;color:var(--ba-mute);cursor:pointer;text-align:left}
.ba-steps button:disabled{cursor:default;opacity:.7}
.ba-steps span{display:inline-grid;place-items:center;width:24px;height:24px;border-radius:50%;background:var(--ba-soft);border:1px solid var(--ba-line);font-size:.8rem;flex:none}
.ba-steps .is-current button{color:var(--ba-ink);border-color:var(--ba-accent);font-weight:600}
.ba-steps .is-current span{background:var(--ba-accent);color:var(--ba-accent-ink);border-color:var(--ba-accent)}
.ba-steps .is-done button{border-color:var(--ba-pass)}
.ba-steps .is-done span{background:var(--ba-pass);color:#fff;border-color:var(--ba-pass)}
.ba-card{background:var(--ba-bg);border:1px solid var(--ba-line);border-radius:10px;padding:clamp(12px,2vw,20px)}
.ba-card h3{margin:0 0 12px;font-size:1.2rem}
.ba-card h4{margin:18px 0 8px;font-size:1rem}
.ba-f{display:block;margin:0 0 14px;border:0;padding:0}
.ba-f>span,.ba-f legend{display:block;font-weight:600;margin-bottom:4px}
.ba-f em,.ba-hint,.ba-hint2,small{color:var(--ba-mute);font-weight:400;font-style:normal}
.ba-hint{margin:6px 0 10px}
#ba-app input[type=text],#ba-app input[type=number],#ba-app select{width:100%;padding:9px 10px;border:1px solid #c6cfd9;border-radius:6px;font:inherit;background:#fff;color:var(--ba-ink)}
#ba-app input:focus,#ba-app select:focus{outline:2px solid var(--ba-accent);outline-offset:1px}
.ba-inline{display:flex;gap:8px}.ba-inline input{flex:1}.ba-inline select{flex:1}
.ba-row{display:flex;gap:8px;flex-wrap:wrap;align-items:center;margin-bottom:10px}.ba-row input[type=text]{flex:1;min-width:220px}
.ba-grid2{display:grid;grid-template-columns:1fr 1fr;gap:0 16px}.ba-grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
.ba-sidebox{border:1px solid var(--ba-line);border-radius:8px;padding:10px;background:var(--ba-soft)}.ba-sidebox input[type=number]{margin-top:6px}
.ba-chk,.ba-r{display:flex;align-items:flex-start;gap:8px;margin:6px 0;font-weight:400;cursor:pointer}
.ba-chk input,.ba-r input{margin-top:5px}
.ba-adv{margin-top:14px;border-top:1px solid var(--ba-line);padding-top:10px}.ba-adv summary{cursor:pointer;font-weight:600}
.ba-btn{background:var(--ba-accent);color:var(--ba-accent-ink);border:1px solid var(--ba-accent);border-radius:6px;padding:10px 22px;font:inherit;font-weight:600;cursor:pointer}
.ba-btn.ghost{background:#fff;color:var(--ba-accent)}.ba-btn.small{padding:8px 14px}.ba-btn:hover{filter:brightness(1.07)}
.ba-nav{display:flex;justify-content:space-between;margin:14px 0}
.ba-foot{color:var(--ba-mute);font-size:.82rem}
.ba-reglist{margin-top:14px}.ba-reg{display:grid;grid-template-columns:1fr auto;gap:2px 10px;padding:10px 12px;border:1px solid var(--ba-line);border-left:4px solid var(--ba-line);border-radius:6px;margin-bottom:8px;background:var(--ba-soft)}
.ba-reg.ok{border-left-color:var(--ba-pass)}.ba-reg.plan{border-left-color:var(--ba-warn)}.ba-reg small{display:block}.ba-reg p{grid-column:1/-1;margin:0;color:var(--ba-mute);font-size:.88rem}
.ba-badge{align-self:start;font-size:.75rem;font-weight:600;padding:2px 8px;border-radius:99px;border:1px solid}
.ba-badge.pass{color:var(--ba-pass);border-color:var(--ba-pass)}.ba-badge.warn{color:var(--ba-warn);border-color:var(--ba-warn)}
.ba-note,.ba-callout{padding:10px 12px;border-radius:6px;border:1px solid var(--ba-line);background:var(--ba-soft);margin:10px 0}
.ba-callout.pass{border-color:var(--ba-pass);background:#eef8f2}.ba-callout.warn{border-color:var(--ba-warn);background:#fff7e8}.ba-callout.fail{border-color:var(--ba-fail);background:#fdeeec}.ba-callout.info{border-color:var(--ba-info);background:#eef4fb}
.ba-map-occ ul{margin:6px 0 0;padding-left:20px}
.ba-map{height:380px;border:1px solid var(--ba-line);border-radius:8px;background:var(--ba-soft);margin-bottom:10px;z-index:0}
.ba-ctx{color:var(--ba-mute);margin:-6px 0 12px}
.ba-tiles{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:10px;margin-bottom:14px}
.ba-tile{border:1px solid var(--ba-line);border-radius:8px;padding:12px;background:var(--ba-soft)}.ba-tile small{display:block}.ba-tile strong{display:block;font-size:1.35rem;margin:2px 0}.ba-tile em{font-style:normal;color:var(--ba-mute);font-size:.85rem}
.ba-plan{border:1px solid var(--ba-line);border-radius:8px;padding:10px;margin-bottom:14px;background:#fff}.ba-plan svg{width:100%;max-height:520px;display:block}
.ba-plan .rd{fill:#d9dde2}.ba-plan .plot{fill:#fff7e8;stroke:#444;stroke-width:.12}.ba-plan .env{fill:var(--ba-env);stroke:var(--ba-pass);stroke-width:.15}
.ba-plan .tx{fill:var(--ba-ink)}.ba-plan .tx.b{font-weight:700}.ba-plan .tx.sm{fill:var(--ba-warn)}.ba-plan .na{fill:var(--ba-ink)}.ba-plan .en{stroke:var(--ba-accent);stroke-width:.25;fill:none}
#ba-app{--ba-warn:#b86e00}
.ba-legend{display:flex;gap:6px;align-items:center;flex-wrap:wrap;font-size:.82rem;color:var(--ba-mute);margin-top:6px}.ba-legend .k{display:inline-block;width:14px;height:14px;border:1px solid #888;margin-left:8px}
.ba-legend .k.plot{background:#fff7e8}.ba-legend .k.env{background:var(--ba-env)}.ba-legend .k.road{background:#d9dde2}
.ba-sec{margin-top:18px}.ba-tbl{width:100%;border-collapse:collapse}.ba-tbl td,.ba-tbl th{padding:6px 8px;vertical-align:top;text-align:left}
.ba-tbl tr:not(.nt){border-top:1px solid var(--ba-line)}.ba-tbl tr.nt td{color:var(--ba-mute);font-size:.88rem;padding-top:0;padding-bottom:8px}
.ba-tbl .st{width:30px}.ba-tbl .lb{width:34%;font-weight:600}.ba-tbl .vl{width:36%}.ba-tbl .rl{text-align:right;white-space:nowrap}
.ba-ic{display:inline-grid;place-items:center;width:20px;height:20px;border-radius:50%;font-size:.75rem;font-weight:700;color:#fff}
.ba-ic.pass{background:var(--ba-pass)}.ba-ic.warn{background:var(--ba-warn)}.ba-ic.fail{background:var(--ba-fail)}.ba-ic.info{background:var(--ba-info)}
.ba-rule{font-size:.78rem;border:1px solid var(--ba-line);background:var(--ba-soft);border-radius:4px;padding:1px 6px;color:var(--ba-mute)}
.ba-tbl.ladder th{font-size:.82rem;color:var(--ba-mute);border-bottom:1px solid var(--ba-line)}
.ba-error{color:var(--ba-fail)}
@media(max-width:640px){.ba-grid2,.ba-grid3{grid-template-columns:1fr}.ba-tbl .rl{display:none}.ba-tbl .lb,.ba-tbl .vl{width:auto}.ba-card{padding:14px}}
@media print{.ba-steps,.ba-nav{display:none}.ba-card{border:0;padding:0}}

/* visual site step */
.ba-site{position:relative;width:100%;max-width:720px;margin:6px auto 12px;aspect-ratio:720/540;container-type:inline-size;border:1px solid var(--ba-line);border-radius:10px;background:var(--ba-soft)}
.ba-site svg{position:absolute;inset:0;width:100%;height:100%}
.ba-site .rd{fill:#d9dde2;stroke:#b8bfc7;stroke-width:1}
.ba-site .plot{fill:#fff7e8;stroke:#333;stroke-width:2}.ba-site .plot.ghost{fill:#fff;stroke:#9aa5b1;stroke-dasharray:6 5}
.ba-site .tx{fill:var(--ba-ink);font-size:14px}.ba-site .tx.b{font-weight:700}.ba-site .tx.sm{fill:var(--ba-mute);font-size:13px}
.ba-site .dim line{stroke:var(--ba-mute);stroke-width:1.2}.ba-site .na{fill:var(--ba-ink)}
.ba-site .tg{cursor:pointer}.ba-site .tg.add rect{fill:#fff;stroke:var(--ba-accent);stroke-dasharray:5 4;stroke-width:1.5}.ba-site .tg.add text{fill:var(--ba-accent);font-size:13px;font-weight:600}
.ba-site .tg.add:hover rect{fill:#e6f4f0}.ba-site .tg circle{fill:#fff;stroke:var(--ba-mute)}.ba-site .tg text{fill:var(--ba-mute);font-size:15px}.ba-site .tg:hover circle{stroke:var(--ba-fail)}
.ba-ov{position:absolute;transform:translate(-50%,-50%);width:max(54px,9.6cqw);padding:4px 6px!important;text-align:center;font-size:max(12px,2.1cqw)!important;font-weight:600;border:1.5px solid var(--ba-accent)!important;background:#fff!important}
.ba-sitecap{position:absolute;left:12px;bottom:8px;font-size:.78rem;color:var(--ba-mute)}
/* result figures */
.ba-figs{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-bottom:14px}.ba-figs .ba-plan{margin:0}
.ba-plan figcaption{font-weight:600;margin:0 0 4px}
.ba-plan .dimr line{stroke:var(--ba-mute);stroke-width:.12}.ba-plan .gr{fill:#a38b6d}.ba-plan .sbk{fill:var(--ba-warn);opacity:.55}
.ba-plan .fl{fill:#cfe8de;stroke:#fff;stroke-width:1.2}.ba-plan .fl.bad{fill:#f3c3bd}
.ba-plan svg .dimr{stroke:var(--ba-mute)}
.ba-legend .k.flk{background:#cfe8de}.ba-legend .k.flk.bad{background:#f3c3bd}
.ba-tbl.cmp th{font-size:.82rem;color:var(--ba-mute);text-align:left;border-bottom:1px solid var(--ba-line)}
@media(max-width:820px){.ba-figs{grid-template-columns:1fr}}
#ba-app .ba-site input.ba-ov{width:max(54px,9.6cqw);box-sizing:border-box;padding:4px 6px;text-align:center;font-size:max(12px,2.1cqw);font-weight:600;border:1.5px solid var(--ba-accent);background:#fff}
/* friendlier site step */
.ba-q{border:1px solid var(--ba-line);border-radius:10px;padding:14px;margin:0 0 14px;background:#fff}
.ba-qh{font-weight:700;margin:0 0 10px;display:flex;align-items:center;gap:8px}
.ba-n{display:inline-grid;place-items:center;width:24px;height:24px;border-radius:50%;background:var(--ba-accent);color:#fff;font-size:.8rem}
.ba-seg{display:flex;border:1px solid var(--ba-accent);border-radius:8px;overflow:hidden;margin:0 0 12px}
.ba-seg button{flex:1;border:0;background:#fff;color:var(--ba-accent);padding:10px 8px;font:inherit;font-weight:600;cursor:pointer}
.ba-seg button.on{background:var(--ba-accent);color:#fff}
[hidden]{display:none!important}
.ba-need{padding:10px 12px;border-radius:8px;border:1px solid var(--ba-line);background:var(--ba-soft);margin:0 0 14px}
.ba-need.ok{border-color:var(--ba-pass);background:#eef8f2;color:var(--ba-pass)}.ba-need.err{border-color:var(--ba-fail);background:#fdeeec}
.ba-compass{margin-top:6px}.ba-cl{display:block;font-weight:600;margin-bottom:6px}
.ba-cg{display:grid;grid-template-columns:repeat(3,56px);gap:4px}
.ba-cg button{height:48px;border:1px solid #c6cfd9;border-radius:8px;background:#fff;font-size:1.1rem;line-height:1;cursor:pointer;display:flex;flex-direction:column;align-items:center;justify-content:center;color:var(--ba-ink)}
.ba-cg button small{font-size:.65rem}.ba-cg button.on{background:var(--ba-accent);color:#fff;border-color:var(--ba-accent)}.ba-cg button.on small{color:#fff}
.ba-cc{display:grid;place-items:center;color:var(--ba-mute)}
.ba-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}
.ba-card2{display:flex;flex-direction:column;gap:2px;border:1px solid #c6cfd9;border-radius:8px;padding:10px;cursor:pointer;position:relative}
.ba-card2 input{position:absolute;opacity:0}.ba-card2:has(input:checked){border-color:var(--ba-accent);background:#e6f4f0;box-shadow:0 0 0 1px var(--ba-accent)}
.ba-card2:has(input:focus-visible){outline:2px solid var(--ba-accent)}
@media(max-width:600px){.ba-cards{grid-template-columns:1fr}}
.ba-f small{display:block;margin-top:3px}
/* site diagram */
.ba-sd{border:1px solid var(--ba-line);border-radius:10px;background:#fff;margin:6px 0 12px;overflow:hidden}
.sd-bar{padding:10px 12px;border-bottom:1px solid var(--ba-line);background:var(--ba-soft)}
.sd-tools{display:flex;flex-wrap:wrap;gap:8px 14px;align-items:center;margin-bottom:8px}
.sd-tools label{display:flex;align-items:center;gap:6px;font-weight:600;font-size:.88rem}
.sd-tools select{width:auto!important;padding:6px 8px!important}
.sd-unit{display:inline-flex;border:1px solid var(--ba-accent);border-radius:7px;overflow:hidden}
.sd-unit button{border:0;background:#fff;color:var(--ba-accent);padding:6px 10px;font:inherit;font-size:.85rem;font-weight:600;cursor:pointer}.sd-unit button.on{background:var(--ba-accent);color:#fff}
.sd-chips{list-style:none;display:flex;gap:4px;margin:0;padding:0;flex-wrap:wrap}
.sd-chips button{display:flex;align-items:center;gap:6px;border:0;background:none;padding:4px 8px;font:inherit;font-size:.85rem;color:var(--ba-mute);cursor:pointer;border-bottom:3px solid var(--ba-line)}
.sd-chips button:disabled{cursor:default;opacity:.6}
.sd-chips span{display:inline-grid;place-items:center;width:20px;height:20px;border-radius:50%;background:#fff;border:1px solid var(--ba-line);font-size:.72rem}
.sd-chips .cur button{color:var(--ba-ink);border-color:var(--ba-accent);font-weight:700}.sd-chips .cur span{background:var(--ba-accent);color:#fff;border-color:var(--ba-accent)}
.sd-chips .done button{border-color:var(--ba-pass)}.sd-chips .done span{background:var(--ba-pass);color:#fff;border-color:var(--ba-pass)}
.sd-canvas{position:relative;width:100%;max-width:760px;margin:0 auto;aspect-ratio:720/610;container-type:inline-size;background:#fbfcfd}
.sd-canvas svg{position:absolute;inset:0;width:100%;height:100%;user-select:none;-webkit-user-select:none}
.sd-canvas svg.drag{touch-action:none}
.sd-canvas .rd{fill:#d9dde2;stroke:#b8bfc7;stroke-width:1}.sd-canvas .rd.priv{fill:#e8e0cf;stroke-dasharray:6 4}.sd-canvas .rd.cur{stroke:var(--ba-accent);stroke-width:2.5}
.sd-canvas .plot{fill:#fff7e8;stroke:none}.sd-canvas .plot.ghost{fill:#fff}
.sd-canvas .edge{stroke:#333;stroke-width:2.5;stroke-linecap:round}.sd-canvas .edge.isfront{stroke:var(--ba-accent);stroke-width:5}.sd-canvas .edge.isroad{stroke:#1a6fb5;stroke-width:4.5}.sd-canvas .edge.cur{stroke-width:6}
.sd-canvas .hit{stroke:transparent;stroke-width:26;cursor:pointer;stroke-linecap:round}.sd-canvas .hit:hover{stroke:rgba(15,110,90,.25)}
.sd-canvas .tx{fill:var(--ba-ink);font-size:14px}.sd-canvas .tx.b{font-weight:700}.sd-canvas .tx.sm{fill:var(--ba-mute);font-size:13px}.sd-canvas .na{fill:var(--ba-ink)}
.sd-canvas .fp{cursor:grab;touch-action:none}.sd-canvas .fp circle{fill:#1a6fb5;stroke:#fff;stroke-width:2}.sd-canvas .fp.on circle{fill:#0b4f8a}.sd-canvas .fp text{fill:#fff;font-weight:700;font-size:12px;pointer-events:none}
.sd-canvas .angw{fill:rgba(26,111,181,.2);stroke:#1a6fb5;stroke-width:1.5}.sd-canvas .angt rect{fill:#fff;stroke:#1a6fb5}.sd-canvas .angt text{font-size:14px;font-weight:700;fill:#1a6fb5}.sd-canvas .angt text.ok{fill:var(--ba-pass)}
.sd-canvas .ra text{font-size:12px;fill:var(--ba-mute)}
.sd-canvas .diag{stroke:#8a6d3b;stroke-width:1.5;stroke-dasharray:7 5}.sd-canvas .fitpv{fill:none;stroke:#1a6fb5;stroke-width:1.5;stroke-dasharray:3 3}
#ba-app .sd-canvas input.ba-ov{position:absolute;transform:translate(-50%,-50%);width:max(46px,10.5cqw);box-sizing:border-box;padding:3px 4px;text-align:center;font-size:max(12px,2cqw);font-weight:600;border:1.5px solid var(--ba-accent);background:#fff;border-radius:6px}
#ba-app .sd-canvas input.ba-ov.wide{width:max(52px,13cqw)}
.sd-msg{padding:10px 14px;border-top:1px solid var(--ba-line);background:var(--ba-soft)}.sd-msg.ok{background:#eef8f2;color:#15613a}.sd-msg.warn{background:#fff7e8}.sd-msg.err{background:#fdeeec}
.sd-act{display:flex;flex-wrap:wrap;gap:8px;align-items:center;padding:10px 14px;border-top:1px solid var(--ba-line)}
.sd-act .ba-btn:disabled{opacity:.45;cursor:not-allowed}
.sd-add{display:inline-flex;align-items:center;gap:6px;font-size:.88rem}.sd-add select{width:auto!important;padding:4px 6px!important}
.sd-tag{display:inline-flex;align-items:center;gap:4px;border:1px solid var(--ba-line);border-radius:12px;padding:2px 8px;font-size:.82rem;background:#fff}.sd-tag button{border:0;background:none;cursor:pointer;color:var(--ba-mute)}
.sd-road{flex-basis:100%;display:flex;flex-direction:column;gap:2px}
.sd-floors{margin-left:auto;display:inline-flex;align-items:center;gap:6px}.sd-floors span{font-weight:600}
.sd-floors button{width:32px;height:32px;border:1px solid var(--ba-accent);border-radius:6px;background:#fff;color:var(--ba-accent);font-size:1.2rem;line-height:1;cursor:pointer}
#ba-app .sd-floors input{width:64px;text-align:center;padding:6px}
.sd-canvas svg text{pointer-events:none}
/* foot row: north sign aligned with the shape's left side, confirmation buttons beside it */
.sd-stage{width:100%;max-width:760px;margin:0 auto}
.sd-stage .sd-canvas{aspect-ratio:720/540}
.sd-foot{display:flex;align-items:center;gap:14px;padding:4px 10px 12px 1%;flex-wrap:wrap;box-sizing:border-box}
.sd-north{display:flex;align-items:center;gap:6px}.sd-north .na{fill:var(--ba-ink)}.sd-north b{display:block;font-size:.95rem;line-height:1}.sd-north span{display:block;font-weight:700;letter-spacing:.14em;font-size:.8rem}
.sd-btns{display:flex;gap:8px;flex-wrap:wrap;align-items:center}
.sd-btns .ba-btn:disabled{opacity:.45;cursor:not-allowed}
.sd-canvas .edge.isfront{stroke:var(--ba-accent);stroke-width:5}.sd-canvas .edge.isside{stroke:#1a6fb5;stroke-width:5}.sd-canvas .edge.isrear{stroke:#c2410c;stroke-width:5}

/* surroundings */
.sd-canvas .edge.sur-res{stroke:#b45309;stroke-width:4;stroke-dasharray:2 7}.sd-canvas .edge.sur-com{stroke:#6d28d9;stroke-width:4;stroke-dasharray:2 7}.sd-canvas .edge.sur-oth{stroke:#6b7280;stroke-width:3;stroke-dasharray:2 7}
.sd-canvas .edge.cur.sur-res,.sd-canvas .edge.cur.sur-com,.sd-canvas .edge.cur.sur-oth{stroke-width:7}
.sd-canvas .tx.sur-res{fill:#b45309;font-weight:600}.sd-canvas .tx.sur-com{fill:#6d28d9;font-weight:600}
#ba-app .sd-canvas select.ba-ov.sel{width:auto;min-width:150px;max-width:60%;padding:6px 8px;font-size:max(13px,2.4cqw);border:2px solid var(--ba-accent);border-radius:8px;background:#fff;transform:translate(-50%,-50%)}
.ba-key{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:12px 0}.ba-key>div{border:1px solid var(--ba-line,#e2e0d8);border-radius:12px;padding:12px 14px;background:#fff}
.ba-key h4{margin:0 0 6px;font-size:.78rem;text-transform:uppercase;letter-spacing:.05em;color:var(--ba-mute)}.ba-key .big{font-size:1.9rem;font-weight:700;line-height:1.1}.ba-key .sub{font-size:.82rem;color:var(--ba-mute);margin-top:2px}
.ba-key ul{list-style:none;margin:6px 0 0;padding:0;font-size:.88rem}.ba-key li{display:flex;justify-content:space-between;gap:8px;padding:3px 0;border-top:1px dashed #e6e3da}.ba-key li small{color:var(--ba-mute)}
@media(max-width:720px){.ba-key{grid-template-columns:1fr}}

/* ---- Kalparekha look: crimson accent, cream panels, Roboto Mono headings, pill buttons ---- */
#ba-app{--ba-tert:#F3ECDB;--ba-sec:#d3e7e9;--ba-dark:#212121;--ba-mono:"Roboto Mono",ui-monospace,Menlo,Consolas,monospace;background:transparent}
#ba-app h2,#ba-app h3,#ba-app h4,#ba-app .ba-qh,#ba-app .ba-key h4,#ba-app figcaption{font-family:var(--ba-mono);font-weight:500;letter-spacing:-.01em;color:var(--ba-ink)}
#ba-app .ba-head h2{font-size:1.6rem;font-weight:500}
#ba-app .ba-btn{border-radius:9999px;padding:11px 26px;font-family:var(--ba-mono);font-weight:500;font-size:.9rem;letter-spacing:.01em;transition:background .15s,color .15s,border-color .15s}
#ba-app .ba-btn:hover{filter:none;background:var(--ba-dark);border-color:var(--ba-dark);color:#fff}
#ba-app .ba-btn.ghost{background:#fff;color:var(--ba-ink);border-color:#c9c9c9}#ba-app .ba-btn.ghost:hover{background:var(--ba-dark);color:#fff;border-color:var(--ba-dark)}
#ba-app .ba-btn.small{padding:8px 18px;font-size:.82rem}
#ba-app .ba-card{background:#fff;border:1px solid var(--ba-line);border-radius:14px}
#ba-app .ba-key>div,#ba-app .ba-sidebox,#ba-app .ba-reg,#ba-app .ba-q,#ba-app .ba-tiles>*{background:var(--ba-soft);border-color:#ece6d6}
#ba-app .ba-key>div{background:#fff;border-color:var(--ba-line);border-radius:14px}
#ba-app .ba-key .big{font-family:var(--ba-mono);color:var(--ba-accent);font-weight:500}
#ba-app input[type=text],#ba-app input[type=number],#ba-app select{border-color:#cfcfcf;border-radius:8px;background:#fff}
#ba-app input:focus,#ba-app select:focus{outline:2px solid var(--ba-accent);outline-offset:1px}
#ba-app .ba-steps .is-current span,#ba-app .ba-steps .is-done span{border-color:transparent}
#ba-app .ba-steps .is-done span{background:var(--ba-dark)}#ba-app .ba-steps .is-done button{border-color:var(--ba-dark)}
#ba-app .ba-tbl th{background:var(--ba-tert);font-family:var(--ba-mono);font-weight:500}
#ba-app .ba-callout{border-radius:10px}
.sd-canvas .plot{fill:#fbf6ea}.ba-plan .plot{fill:#fbf6ea}.ba-legend .k.plot{background:#fbf6ea}
.sd-canvas .tx,.ba-plan .tx{font-family:Roboto,sans-serif}
.ba-quote{margin-top:22px;padding:22px;border-radius:16px;background:var(--ba-tert);text-align:center}
.ba-quote h4{margin:0 0 6px;font-size:1.15rem}.ba-quote p{margin:0 0 14px;color:var(--ba-mute);max-width:560px;margin-left:auto;margin-right:auto}
.ba-quote .ba-btn{font-size:1rem;padding:14px 34px}.ba-quote small{display:block;margin-top:10px}
.ba-quote .qn{margin-top:12px;font-size:.88rem;color:var(--ba-mute)}
.ba-brand{display:flex;align-items:center;gap:10px;margin:0 0 4px;font-family:var(--ba-mono);font-size:.78rem;text-transform:uppercase;letter-spacing:.14em;color:var(--ba-accent)}

/* square edges */
#ba-app *:not(svg):not(svg *){border-radius:0 !important}
#ba-app .ba-btn,#ba-app input,#ba-app select,#ba-app .ba-card,#ba-app .ba-quote,#ba-app .ba-key>div{border-radius:0 !important}
#ba-app .ba-disclaimer{margin:0 0 14px;padding:8px 12px;border-left:3px solid var(--ba-accent);background:var(--ba-soft);font-size:.85rem;color:var(--ba-mute)}
#ba-app .ba-courtesy{margin:14px 0 0;padding-top:12px;border-top:1px solid var(--ba-line);text-align:center;font-family:var(--ba-mono);font-size:.8rem;color:var(--ba-accent)}

#ba-app .ba-head .ba-tag{margin:6px 0 4px;color:var(--ba-accent);font-weight:700;font-size:1.05rem}
#ba-app .ba-head .ba-mission{margin:0 0 8px;font-size:.85rem;font-style:italic;color:var(--ba-mute,#5e5e5e);max-width:720px}

/* ---- v1.1 header refinement: lighter top, readable body ---- */
#ba-app{font-size:16px;--ba-mute:#4a4a4a}
#ba-app .ba-head{margin:0 0 10px}
#ba-app .ba-brand{margin:0 0 2px;font-size:.7rem;letter-spacing:.16em;color:var(--ba-accent)}
#ba-app .ba-head h2{margin:0 0 8px;font-size:1.35rem;line-height:1.25}
#ba-app .ba-disclaimer{margin:0 0 12px;padding:7px 12px;font-size:.84rem;line-height:1.4;color:var(--ba-ink)}
#ba-app .ba-disclaimer b{color:var(--ba-accent);font-family:var(--ba-mono);font-weight:600;margin-right:4px}
#ba-app .ba-steps button{color:#3b3b3b;font-size:.95rem;padding:10px 6px}
#ba-app .ba-steps button:disabled{opacity:1;color:#767676}
#ba-app .ba-steps span{width:26px;height:26px;font-size:.85rem}
#ba-app .ba-card{padding:22px}
#ba-app label,#ba-app .ba-q label{font-size:.95rem}
#ba-app select,#ba-app input[type=text],#ba-app input[type=number]{font-size:1rem;min-height:44px}
#ba-app .ba-about{margin:26px 0 8px;padding:18px 0 0;border-top:1px solid var(--ba-line);text-align:center}
#ba-app .ba-about .ba-tag{margin:0 0 6px;color:var(--ba-accent);font-weight:700;font-size:1.1rem}
#ba-app .ba-about .ba-mission{margin:0 auto;max-width:640px;font-size:.9rem;font-style:italic;color:var(--ba-mute);line-height:1.6}
#ba-app .ba-foot{margin-top:16px;font-size:.78rem;color:#6a6a6a;text-align:center}
@media(max-width:600px){#ba-app .ba-head h2{font-size:1.15rem}#ba-app .ba-card{padding:16px}}
@media(max-width:600px){#ba-app .ba-steps{overflow:visible;gap:3px}#ba-app .ba-steps li{min-width:0;flex:1}#ba-app .ba-steps li:not(.is-current){flex:0 0 44px}#ba-app .ba-steps li.is-current{flex:1 1 auto}#ba-app .ba-steps li:not(.is-current) button{font-size:0;justify-content:center;padding:10px 0}#ba-app .ba-steps li:not(.is-current) span{font-size:.85rem}}


/* ===== V2: spacing ===== */
#ba-app{box-sizing:border-box}
#ba-app .ba-head p{margin-bottom:10px}
.ba-nav{margin:12px 0;gap:10px}
.ba-nav .ba-btn{min-height:44px}
@media(min-width:1000px){.ba-card{padding:18px 22px}}
@media(max-width:640px){
  #ba-app{font-size:15px;}
  .ba-card{padding:12px 10px;border-radius:8px}
  .ba-q{padding:10px}
  .ba-sd{margin-inline:-2px}
  .sd-bar{padding:8px}
  .ba-tbl td,.ba-tbl th{padding:5px 4px}
  .ba-key{grid-template-columns:1fr}
  .ba-sheetwrap{overflow-x:auto}
  .ba-sheet table.sh-t{font-size:11.5px}
  .ba-sheet .sh-t th,.ba-sheet .sh-t td{padding:2px 4px}
  #ba-app input[type=text],#ba-app input[type=number],#ba-app select,#ba-app textarea{font-size:16px}
}
#ba-app textarea{width:100%;padding:9px 10px;border:1px solid #c6cfd9;border-radius:6px;font:inherit;background:#fff;resize:vertical}
.ba-unitsw{margin:4px 0 10px;padding:8px 10px;border-radius:8px;background:var(--ba-soft);border:1px solid var(--ba-line);font-size:.9rem}
.ba-authority h5{margin:12px 0 4px;font-size:.95rem}
.ba-tbl tr.pass .st .ba-ic,.ba-tbl tr.fail .st .ba-ic{flex:none}

/* ===== V2: gentle guidance animations ===== */
@keyframes baGuide{0%,100%{box-shadow:0 0 0 0 rgba(174,31,37,0);border-color:rgba(174,31,37,.45)}50%{box-shadow:0 0 0 4px rgba(174,31,37,.22);border-color:rgba(174,31,37,.95)}}
@keyframes baGuideBtn{0%,100%{box-shadow:0 0 0 0 rgba(174,31,37,0)}50%{box-shadow:0 0 0 5px rgba(174,31,37,.25)}}
@keyframes baBlink{0%,100%{opacity:.4}50%{opacity:1}}
@keyframes baRoad{0%,100%{stroke-opacity:.55}50%{stroke-opacity:1}}
#ba-app .ba-guide{animation:baGuide 2.2s ease-in-out infinite;border:1.5px solid var(--ba-accent)}
#ba-app button.ba-guide,#ba-app .ba-btn.ba-guide{animation:baGuideBtn 2.2s ease-in-out infinite}
#ba-app input.guide,#ba-app select.guide{animation:baGuide 2.2s ease-in-out infinite;border:1.5px solid var(--ba-accent)!important}
#ba-app .sd-btns .ba-btn.guide{animation:baGuideBtn 2.2s ease-in-out infinite}
.sd-canvas .edge.pulse{animation:baBlink 2s ease-in-out infinite}
.sd-canvas .edge.sur-res.pulse,.sd-canvas .edge.sur-com.pulse,.sd-canvas .edge.sur-oth.pulse{animation:baBlink 2s ease-in-out infinite}
.sd-canvas .edge.cur{animation:baBlink 1.6s ease-in-out infinite}
.sd-canvas .rd.cur{animation:baRoad 1.8s ease-in-out infinite}
@media(prefers-reduced-motion:reduce){#ba-app .ba-guide,#ba-app input.guide,#ba-app select.guide,#ba-app .sd-btns .ba-btn.guide,.sd-canvas .edge.pulse,.sd-canvas .edge.cur,.sd-canvas .rd.cur{animation:none}}

.ba-sheet .sh-t td,.ba-sheet .sh-t th{overflow-wrap:anywhere;word-break:normal}
.ba-sheet{overflow-x:auto}

.ba-scrollx{overflow-x:auto;-webkit-overflow-scrolling:touch}.ba-scrollx .cmp td,.ba-scrollx .cmp th{font-size:.85rem}

/* V2.1: more floors */
.ba-more{margin-top:10px}.ba-morerow{display:flex;gap:8px;align-items:center}.ba-morerow select{flex:1;min-width:0;width:auto!important}
.ba-btn.go{background:#2f7d4f;border-color:#2f7d4f;color:#fff}.ba-btn.go:hover{filter:brightness(1.08)}
#ba-app .ba-btn.go.ba-guide{animation:baGuideGreen 2.2s ease-in-out infinite}
@keyframes baGuideGreen{0%,100%{box-shadow:0 0 0 0 rgba(47,125,79,0)}50%{box-shadow:0 0 0 5px rgba(47,125,79,.28)}}
/* quote chooser */
.ba-qchoose{max-width:520px;margin:14px auto 0;display:grid;gap:8px;text-align:left}
.ba-qchoose p{margin:0 0 2px;text-align:center}
.ba-qopt{display:flex;flex-direction:column;gap:2px;align-items:flex-start;width:100%;padding:12px 14px;border:1px solid var(--ba-line);border-radius:8px;background:#fff;font:inherit;color:var(--ba-ink);cursor:pointer;text-align:left;transition:border-color .15s,box-shadow .15s}
.ba-qopt:hover:not(:disabled){border-color:var(--ba-accent);box-shadow:0 0 0 2px rgba(174,31,37,.12)}
.ba-qopt b{font-weight:600}.ba-qopt small{color:var(--ba-mute)}
.ba-qopt.wa{border-color:#25d366}.ba-qopt.wa:hover:not(:disabled){border-color:#128c7e;box-shadow:0 0 0 2px rgba(37,211,102,.2)}
.ba-qweb{cursor:default}.ba-qweb span{margin-top:6px;display:flex;gap:8px;flex-wrap:wrap}
.ba-qopt:disabled{opacity:.6;cursor:wait}
.ba-quote .qn{margin-top:10px;color:var(--ba-mute);min-height:1.2em}
.ba-qopt small{margin-top:0!important}
.ba-figcol{display:grid;gap:14px;align-content:start}.ba-figcol .ba-plan{margin:0}

/* title */
#ba-app .ba-head h2 .ba-by{color:var(--ba-accent);white-space:nowrap}
.ba-how{float:right;margin:0 0 6px 10px}
/* tutorial */
.tu{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,340px),1fr));gap:16px;margin:14px 0}
.tu-card{border:1px solid var(--ba-line);border-radius:12px;background:#fff;overflow:hidden}
.tu-card svg{display:block;width:100%;height:auto;background:var(--ba-soft)}
.tu-card .tt{padding:10px 14px 14px}.tu-card h4{margin:0 0 4px;font-size:1rem;display:flex;align-items:center;gap:8px}.tu-card p{margin:0;color:var(--ba-mute);font-size:.9rem}
.tu-n{display:inline-grid;place-items:center;width:24px;height:24px;border-radius:50%;background:var(--ba-accent);color:#fff;font-size:.8rem;flex:none}
@keyframes tuOff52{0%,52%{opacity:1}55%,100%{opacity:0}}
@keyframes tuHl{0%,16%{transform:translateY(0)}34%,100%{transform:translateY(26px)}}
@keyframes tuPin{0%,52%{opacity:0;transform:translateY(-28px)}60%{opacity:1;transform:translateY(0)}64%{transform:translateY(-6px)}68%,92%{opacity:1;transform:translateY(0)}97%,100%{opacity:0}}
@keyframes tuRing{0%,10%{transform:translateX(0);opacity:1}30%,42%{transform:translateX(220px)}62%,94%{transform:translateX(110px);opacity:1}100%{transform:translateX(110px);opacity:0}}
@keyframes tuDr{0%,4%{stroke-dashoffset:408}34%,100%{stroke-dashoffset:0}}
@keyframes tuPop{0%,14%{transform:scale(.2);opacity:0}30%,94%{transform:scale(1);opacity:1}100%{opacity:0}}
@keyframes tuFly{0%,8%{transform:translate(-30px,0);opacity:0}22%{opacity:1}56%{transform:translate(70px,-4px);opacity:1}66%,100%{transform:translate(90px,-4px);opacity:0}}
@media(prefers-reduced-motion:reduce){.tu-card svg *{animation:none!important}.tu-card svg .tu-tmp{display:none}.tu-card svg [style*="tuW"]{opacity:1!important}}
@media(max-width:600px){.ba-how{float:none;display:block;margin:0 0 8px auto}}