/* RC Calc shared stylesheet: aviation blueprint theme (light + dark), all pages. */
:root{
  --paper:#f4f7fb; --grid:rgba(14,58,99,.055); --grid-major:rgba(14,58,99,.10);
  --card:#ffffff; --card-2:#eef3f9; --ink:#0b2545; --ink-2:#2c4a6e; --muted:#566a82; --line:#d3dde9;
  --accent:#0891b2; --accent-ink:#0e7490; --accent-soft:#e1f4f9; --on-accent:#ffffff;
  --amber:#a8510a; --amber-soft:#fff3d9; --amber-line:#f59e0b;
  --ok:#15803d; --ok-soft:#e5f5eb; --bad:#b91c1c; --bad-soft:#fdeaea;
  --shadow:0 1px 2px rgba(11,37,69,.06),0 10px 28px -14px rgba(11,37,69,.22);
  --radius:14px; --radius-sm:9px;
  --d-paper:#f9fbfd; --d-grid:#e4ecf4; --d-grid-major:#d2dfeb; --d-ink:#0b2545; --d-fill:#e9f2f9; --d-accent:#0891b2; --d-cg:#b45309; --d-band:rgba(8,145,178,.16); --d-dim:#2c4a6e;
  --font:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;
}
:root[data-theme="dark"]{
  --paper:#08111f; --grid:rgba(103,232,249,.045); --grid-major:rgba(103,232,249,.085);
  --card:#0e1a2d; --card-2:#132339; --ink:#e6eef8; --ink-2:#bccbdd; --muted:#93a7bf; --line:#22364f;
  --accent:#22d3ee; --accent-ink:#67e8f9; --accent-soft:rgba(34,211,238,.12); --on-accent:#04222b;
  --amber:#fbbf24; --amber-soft:rgba(251,191,36,.12); --amber-line:#f59e0b;
  --ok:#4ade80; --ok-soft:rgba(74,222,128,.12); --bad:#f87171; --bad-soft:rgba(248,113,113,.12);
  --shadow:0 1px 2px rgba(0,0,0,.4),0 12px 30px -14px rgba(0,0,0,.6);
  --d-paper:#0b1a30; --d-grid:#12263f; --d-grid-major:#183252; --d-ink:#dbeafe; --d-fill:rgba(56,189,248,.10); --d-accent:#22d3ee; --d-cg:#fbbf24; --d-band:rgba(34,211,238,.18); --d-dim:#93c5fd;
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --paper:#08111f; --grid:rgba(103,232,249,.045); --grid-major:rgba(103,232,249,.085);
    --card:#0e1a2d; --card-2:#132339; --ink:#e6eef8; --ink-2:#bccbdd; --muted:#93a7bf; --line:#22364f;
    --accent:#22d3ee; --accent-ink:#67e8f9; --accent-soft:rgba(34,211,238,.12); --on-accent:#04222b;
    --amber:#fbbf24; --amber-soft:rgba(251,191,36,.12); --amber-line:#f59e0b;
    --ok:#4ade80; --ok-soft:rgba(74,222,128,.12); --bad:#f87171; --bad-soft:rgba(248,113,113,.12);
    --shadow:0 1px 2px rgba(0,0,0,.4),0 12px 30px -14px rgba(0,0,0,.6);
    --d-paper:#0b1a30; --d-grid:#12263f; --d-grid-major:#183252; --d-ink:#dbeafe; --d-fill:rgba(56,189,248,.10); --d-accent:#22d3ee; --d-cg:#fbbf24; --d-band:rgba(34,211,238,.18); --d-dim:#93c5fd;
  }
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
@media (prefers-reduced-motion: no-preference){html{scroll-behavior:smooth}}
body{margin:0;font-family:var(--font);color:var(--ink);background-color:var(--paper);line-height:1.55;font-size:16px;
  background-image:linear-gradient(var(--grid-major) 1px,transparent 1px),linear-gradient(90deg,var(--grid-major) 1px,transparent 1px),linear-gradient(var(--grid) 1px,transparent 1px),linear-gradient(90deg,var(--grid) 1px,transparent 1px);
  background-size:120px 120px,120px 120px,24px 24px,24px 24px;background-attachment:fixed}
a{color:var(--accent-ink)}
h1,h2,h3{line-height:1.2;letter-spacing:-.01em;margin:0}
h2{font-size:1.6rem}
h3{font-size:1rem}
code,pre{font-family:var(--mono)}
.sr-only{position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.skip{position:absolute;left:12px;top:-60px;background:var(--ink);color:var(--paper);padding:8px 14px;border-radius:8px;z-index:100}
.skip:focus{top:10px}
:focus-visible{outline:3px solid var(--accent);outline-offset:2px;border-radius:6px}
.wrap{max-width:1320px;margin:0 auto;padding:0 20px}
@media (max-width:480px){.wrap{padding:0 14px}}
.ico{display:inline-flex;width:20px;height:20px;flex:none}
.ico svg,svg.ico{width:100%;height:100%;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}

/* Top bar */
.topbar{position:sticky;top:0;z-index:50;background:var(--paper);background:color-mix(in srgb,var(--paper) 86%,transparent);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.topbar .wrap{display:flex;align-items:center;gap:14px;min-height:60px;flex-wrap:wrap;padding-top:6px;padding-bottom:6px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;color:var(--ink);text-decoration:none;white-space:nowrap}
.brand .logo{width:30px;height:30px;color:var(--accent)}
.brand small{display:block;font-weight:500;color:var(--muted);font-size:.72rem;letter-spacing:.08em;text-transform:uppercase}
.nav{display:flex;gap:4px;overflow-x:auto;flex:1;min-width:0;scrollbar-width:none}
.nav a{padding:8px 12px;border-radius:999px;color:var(--ink-2);text-decoration:none;font-weight:600;font-size:.92rem;white-space:nowrap;transition:background .15s,color .15s}
.nav a:hover{background:var(--card-2);color:var(--ink)}
.nav a.active{background:var(--accent-soft);color:var(--accent-ink)}
.tools{display:flex;gap:8px;align-items:center}
@media (max-width:760px){.nav{order:3;flex-basis:100%}}

/* Buttons & controls */
.btn{display:inline-flex;align-items:center;gap:8px;font:inherit;font-weight:600;font-size:.92rem;padding:9px 14px;border-radius:10px;border:1px solid var(--line);background:var(--card);color:var(--ink);cursor:pointer;transition:background .15s,border-color .15s,transform .1s;text-decoration:none}
.btn:hover{border-color:var(--accent);background:var(--card-2)}
.btn:active{transform:translateY(1px)}
.btn.primary{background:var(--accent);border-color:var(--accent);color:var(--on-accent)}
.btn.primary:hover{filter:brightness(1.06)}
.btn.icon-only{padding:9px}
.btn[disabled]{opacity:.55;cursor:not-allowed}
.btn .ico{width:18px;height:18px}
.seg{display:inline-flex;background:var(--card-2);border:1px solid var(--line);border-radius:10px;padding:3px;gap:2px;position:relative}
.seg input{position:absolute;opacity:0;width:1px;height:1px}
.seg label{padding:6px 12px;border-radius:7px;font-weight:600;font-size:.86rem;color:var(--ink-2);cursor:pointer;transition:background .15s,color .15s;white-space:nowrap}
.seg input:checked+label{background:var(--card);color:var(--accent-ink);box-shadow:0 1px 3px rgba(0,0,0,.12)}
.seg input:focus-visible+label{outline:3px solid var(--accent);outline-offset:1px}
input[type=number],input[type=text],select{font:inherit;color:var(--ink);background:var(--card);border:1px solid var(--line);border-radius:var(--radius-sm);padding:8px 10px;min-height:40px;width:100%;transition:border-color .15s,box-shadow .15s}
input[type=number]{font-variant-numeric:tabular-nums}
input:focus,select:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft);outline:none}
input[aria-invalid=true]{border-color:var(--bad);box-shadow:0 0 0 3px var(--bad-soft)}
input[readonly]{background:var(--card-2);color:var(--ink-2)}
input:disabled,select:disabled{opacity:.6;cursor:not-allowed}
input[type=range]{width:100%;accent-color:var(--accent)}
input[type=checkbox],input[type=radio]{accent-color:var(--accent)}
select{padding-right:6px}

/* Layout */
main section.page{padding:42px 0 18px;scroll-margin-top:70px}
.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:16px;flex-wrap:wrap;margin-bottom:20px}
.eyebrow{font-size:.74rem;letter-spacing:.14em;text-transform:uppercase;color:var(--accent-ink);font-weight:700;display:flex;align-items:center;gap:8px}
.eyebrow::before{content:"";width:22px;height:1.5px;background:var(--accent)}
.lede{color:var(--ink-2);max-width:70ch;margin:8px 0 0}
.hero h1{font-size:clamp(1.7rem,3.6vw,2.6rem);margin-top:6px}
.panel,.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}
.panel{padding:20px}
.calc-layout{display:grid;gap:24px;grid-template-columns:1fr;align-items:start}
.calc-layout>*,.diag-layout>*{min-width:0}
select{max-width:100%}
@media (min-width:1000px){.calc-layout{grid-template-columns:minmax(340px,410px) 1fr}}
fieldset.group{border:0;border-top:1px solid var(--line);margin:0;padding:18px 0 4px}
fieldset.group:first-of-type{border-top:0;padding-top:4px}
fieldset.group>legend{font-weight:700;display:flex;align-items:center;gap:8px;padding:0;margin-bottom:10px;float:left;width:100%}
fieldset.group>legend+*{clear:both}
legend .ico{color:var(--accent-ink)}
.field{margin:10px 0 12px}
.field>label,.flabel{display:flex;align-items:center;gap:6px;font-weight:600;font-size:.9rem;margin-bottom:5px;color:var(--ink)}
.hint{color:var(--muted);font-size:.82rem;margin:5px 0 0}
.input-unit{display:flex;gap:6px}
.input-unit input{flex:1;min-width:0}
.input-unit select{width:auto;min-width:76px;flex:none}
.row2{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:10px}
#d-auto{white-space:nowrap;font-size:.86rem;padding:9px 10px}
.prop-row{display:grid;grid-template-columns:minmax(0,1fr) auto minmax(0,1fr);gap:8px;align-items:end}
.prop-row .x{padding-bottom:9px;color:var(--muted);font-weight:700}
.help{display:inline-grid;place-items:center;width:20px;height:20px;border-radius:50%;font-size:.72rem;font-weight:800;text-decoration:none;color:var(--accent-ink);background:var(--accent-soft);border:1px solid color-mix(in srgb,var(--accent) 35%,transparent);flex:none}
.help:hover{background:var(--accent);color:var(--on-accent)}
.readout{display:flex;flex-wrap:wrap;gap:8px;margin:6px 0 4px}
.pill{display:inline-flex;align-items:center;gap:6px;padding:4px 10px;border-radius:999px;background:var(--card-2);border:1px solid var(--line);font-size:.82rem;font-variant-numeric:tabular-nums;color:var(--ink-2)}
.pill b{color:var(--ink)}
.badge{display:inline-flex;align-items:center;gap:6px;padding:4px 10px;border-radius:999px;font-weight:700;font-size:.8rem}
.badge.under{background:var(--ok-soft);color:var(--ok)}
.badge.over{background:var(--amber-soft);color:var(--amber)}
.styles{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:8px}
.choice{position:relative;display:block;border:1px solid var(--line);border-radius:var(--radius-sm);padding:10px 12px;cursor:pointer;background:var(--card);transition:border-color .15s,background .15s}
.choice input{position:absolute;opacity:0;width:1px;height:1px}
.choice b{display:block;font-size:.9rem}
.choice span{display:block;font-size:.76rem;color:var(--muted)}
.choice:has(input:checked){border-color:var(--accent);background:var(--accent-soft)}
.choice:has(input:focus-visible){outline:3px solid var(--accent);outline-offset:2px}
table{border-collapse:collapse;width:100%;font-variant-numeric:tabular-nums}
.budget th,.budget td{padding:4px 0;text-align:left;font-size:.88rem;font-weight:500;vertical-align:middle}
.budget td{width:52%}
.budget thead th{color:var(--muted);font-size:.76rem;text-transform:uppercase;letter-spacing:.06em}
.budget input{min-height:34px;padding:5px 8px}
.servo-cell{display:flex;gap:6px;align-items:center}
.servo-cell input:last-child{width:60px;flex:none}
.budget tr.total th,.budget tr.total td{border-top:1px solid var(--line);padding-top:8px;font-weight:700}
details.assume{margin-top:14px;border:1px dashed var(--line);border-radius:var(--radius-sm);padding:4px 12px}
details.assume>summary{cursor:pointer;font-weight:700;padding:8px 0;list-style-position:outside}
.actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:18px}
.check{display:flex;gap:8px;align-items:center;font-size:.9rem;margin:8px 0}
output.big{font-weight:700;font-variant-numeric:tabular-nums}

/* Results */
.results-head{display:flex;justify-content:space-between;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:10px}
.summary{margin:0 0 12px;color:var(--ink-2);font-size:.92rem}
.warnings{list-style:none;margin:0 0 16px;padding:0;display:grid;gap:8px}
.warnings li{display:flex;gap:10px;align-items:flex-start;padding:10px 12px;border-radius:var(--radius-sm);font-size:.9rem;border:1px solid}
.warnings li .ico{margin-top:1px}
.warnings li.warn{background:var(--amber-soft);border-color:color-mix(in srgb,var(--amber-line) 45%,transparent);color:var(--ink)}
.warnings li.warn .ico{color:var(--amber)}
.warnings li.info{background:var(--accent-soft);border-color:color-mix(in srgb,var(--accent) 30%,transparent)}
.warnings li.info .ico{color:var(--accent-ink)}
.warnings li.ok{background:var(--ok-soft);border-color:color-mix(in srgb,var(--ok) 30%,transparent)}
.warnings li.ok .ico{color:var(--ok)}
.warnings a{font-weight:600;white-space:nowrap}
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(100%,205px),1fr));gap:14px}
.card.result{padding:14px 14px 10px;display:flex;flex-direction:column;gap:4px;position:relative;transition:border-color .2s,box-shadow .2s}
.card.result:hover{border-color:color-mix(in srgb,var(--accent) 45%,var(--line))}
.card.result.is-warn{border-color:var(--amber-line);box-shadow:inset 3px 0 0 var(--amber-line),var(--shadow)}
.card-head{display:flex;align-items:center;gap:4px 8px;flex-wrap:wrap}
.card-head .ico{color:var(--accent-ink);width:18px;height:18px}
.card-head h3{font-size:.84rem;font-weight:650;color:var(--ink-2);flex:1 1 110px;min-width:0}
.card-head .tag{margin-left:auto}
.tag{font-size:.64rem;font-weight:800;letter-spacing:.06em;text-transform:uppercase;padding:2px 7px;border-radius:999px;white-space:nowrap;border:1px solid transparent}
.tag-physics{background:var(--accent-soft);color:var(--accent-ink)}
.tag-estimate{border-color:var(--ink-2);color:var(--ink-2)}
.tag-rule{border:1px dashed var(--muted);color:var(--muted)}
.value{margin:4px 0 0;display:flex;align-items:baseline;gap:6px;flex-wrap:wrap}
.value .num{font-size:1.85rem;font-weight:750;font-variant-numeric:tabular-nums;letter-spacing:-.02em;line-height:1.1}
.value .unit{color:var(--muted);font-weight:600}
.unit-sel{width:auto;min-height:28px;padding:2px 4px;font-size:.84rem;color:var(--muted);font-weight:600;border-radius:7px}
.sub{margin:0;color:var(--muted);font-size:.8rem;min-height:1.2em}
details.how{margin-top:auto;border-top:1px dashed var(--line);padding-top:6px}
details.how>summary{cursor:pointer;font-size:.78rem;font-weight:700;color:var(--accent-ink);padding:2px 0}
pre.formula{white-space:pre-wrap;word-break:break-word;font-size:.76rem;background:var(--card-2);border-radius:8px;padding:9px 10px;margin:6px 0;color:var(--ink);line-height:1.5}
.learn-link{font-size:.78rem;font-weight:600}
.wide{margin-top:16px;padding:18px}
.wide h3{font-size:1.05rem;display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.table-scroll{overflow-x:auto;margin-top:10px}
.data th,.data td{padding:8px 10px;border-bottom:1px solid var(--line);text-align:left;font-size:.86rem;white-space:nowrap}
.data th{color:var(--muted);font-size:.74rem;text-transform:uppercase;letter-spacing:.05em;font-weight:700}
.data tr.hl td{background:var(--accent-soft)}
.data td.num{text-align:right}
.fit{display:inline-flex;align-items:center;gap:5px;font-weight:600}
.fit.ok{color:var(--ok)} .fit.no{color:var(--muted)}
.fit .ico{width:15px;height:15px}
.disclaimer{display:flex;gap:10px;padding:12px 14px;border-radius:var(--radius-sm);background:var(--amber-soft);border:1px solid color-mix(in srgb,var(--amber-line) 40%,transparent);font-size:.86rem;margin-top:16px}
.disclaimer .ico{color:var(--amber)}
.toast{position:fixed;left:50%;bottom:22px;transform:translateX(-50%) translateY(20px);background:var(--ink);color:var(--paper);padding:10px 16px;border-radius:10px;opacity:0;pointer-events:none;transition:opacity .2s,transform .2s;z-index:90;max-width:92vw;font-size:.9rem}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}

/* Converter */
.converter{display:grid;gap:10px;grid-template-columns:repeat(auto-fit,minmax(130px,1fr));align-items:end}
.converter .out{grid-column:1/-1;font-size:1.25rem;font-weight:700;font-variant-numeric:tabular-nums;padding:10px 12px;background:var(--card-2);border-radius:var(--radius-sm)}

/* Diagram */
.diag-layout{display:grid;gap:24px;grid-template-columns:1fr;align-items:start}
@media (min-width:1000px){.diag-layout{grid-template-columns:minmax(320px,380px) 1fr}}
.diag-fields{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:4px 10px}
.diag-fields .field{margin:4px 0}
.diag-fields .field>label{font-size:.8rem}
.diag-fields input,.diag-fields select{min-height:36px;padding:6px 8px}
.diagram-box{padding:12px}
.diagram-svg{width:100%;height:auto;display:block;border-radius:10px}
.chips{display:flex;flex-wrap:wrap;gap:8px;margin:12px 0 4px}
.chip{display:inline-flex;align-items:center;gap:7px;padding:6px 11px;border-radius:999px;font-size:.84rem;border:1px solid var(--line);background:var(--card);font-variant-numeric:tabular-nums}
.chip .dot{width:10px;height:10px;border-radius:50%;flex:none}
.chip.ok .dot{background:var(--ok)} .chip.warn .dot{background:var(--amber-line)} .chip.bad .dot{background:var(--bad)} .chip.na .dot{background:var(--muted)}
.chip.ok{border-color:color-mix(in srgb,var(--ok) 40%,transparent)} .chip.warn{border-color:color-mix(in srgb,var(--amber-line) 50%,transparent)} .chip.bad{border-color:color-mix(in srgb,var(--bad) 45%,transparent)}
.chip small{color:var(--muted)}

/* Learn */
.learn-grid{display:grid;gap:12px;grid-template-columns:1fr}
@media (min-width:900px){.learn-grid{grid-template-columns:1fr 1fr}}
details.lcard{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);scroll-margin-top:80px}
details.lcard>summary{cursor:pointer;padding:14px 18px;display:flex;gap:12px;align-items:center;list-style:none}
details.lcard>summary::-webkit-details-marker{display:none}
details.lcard>summary::after{content:"";width:9px;height:9px;border-right:2px solid var(--muted);border-bottom:2px solid var(--muted);transform:rotate(45deg);margin-left:auto;transition:transform .2s;flex:none}
details.lcard[open]>summary::after{transform:rotate(-135deg)}
details.lcard>summary .num{font-family:var(--mono);font-size:.78rem;color:var(--accent-ink);background:var(--accent-soft);border-radius:6px;padding:2px 6px}
details.lcard>summary b{font-size:1rem}
details.lcard .lbody{padding:0 18px 16px;color:var(--ink-2);font-size:.94rem}
details.lcard .lbody p{margin:.5em 0}
details.lcard .lbody ul{padding-left:1.2em;margin:.4em 0}
.example{background:var(--card-2);border-left:3px solid var(--accent);border-radius:8px;padding:10px 12px;margin:10px 0}
.example b{color:var(--ink)}
.example code{font-size:.84rem}
.glossary dl{display:grid;grid-template-columns:minmax(120px,auto) 1fr;gap:6px 18px;margin:0}
.glossary dt{font-weight:700}
.glossary dd{margin:0;color:var(--ink-2)}
@media (max-width:560px){.glossary dl{grid-template-columns:1fr}.glossary dd{margin-bottom:8px}}

/* Advanced TODO */
.todo-card{position:relative;overflow:hidden;padding:26px}
.ribbon{position:absolute;top:22px;right:-52px;transform:rotate(45deg);background:var(--amber-line);color:#2b1600;font-weight:800;font-size:.72rem;letter-spacing:.12em;text-transform:uppercase;padding:6px 60px;box-shadow:0 4px 10px rgba(0,0,0,.18)}
.todo-banner{display:flex;gap:10px;align-items:flex-start;background:var(--amber-soft);border:1px dashed var(--amber-line);border-radius:var(--radius-sm);padding:12px 14px;margin:0 0 18px;max-width:calc(100% - 70px)}
.todo-banner .ico{color:var(--amber)}
.todo-grid{display:grid;gap:22px;grid-template-columns:1fr}
@media (min-width:900px){.todo-grid{grid-template-columns:1fr 1fr}}
.todo-form{border:0;padding:0;margin:0;display:grid;gap:10px;min-width:0}
.todo-grid>*{min-width:0}
.todo-form .field{margin:0}
.roadmap{list-style:none;padding:0;margin:8px 0;display:grid;gap:8px}
.roadmap li{display:flex;gap:10px;align-items:center;padding:8px 10px;border:1px solid var(--line);border-radius:var(--radius-sm);background:var(--card-2)}
.roadmap li label{color:var(--ink-2)}
pre.stub{font-size:.78rem;background:var(--card-2);border-radius:10px;padding:12px;overflow-x:auto;color:var(--ink-2)}
footer{padding:30px 0 40px;color:var(--muted);font-size:.85rem;border-top:1px solid var(--line);margin-top:30px}

@media (prefers-reduced-motion: reduce){*,*::before,*::after{transition:none!important;animation:none!important;scroll-behavior:auto!important}}

@media print{
  :root,:root[data-theme="dark"]{--paper:#fff;--card:#fff;--card-2:#f3f5f8;--ink:#000;--ink-2:#222;--muted:#444;--line:#bbb;--accent-ink:#0e5566;--accent-soft:#eef7fa;--shadow:none}
  body{background:#fff;font-size:11pt}
  .topbar,.skip,#calc-form,#units,#learn,#advanced,.actions,.no-print,details.how>summary,.diag-controls,footer,.toast{display:none!important}
  main section.page{padding:10px 0}
  .calc-layout,.diag-layout{display:block}
  .card,.panel{box-shadow:none;break-inside:avoid}
  .cards{grid-template-columns:repeat(3,1fr)}
  .unit-sel{border:0;appearance:none;-webkit-appearance:none;padding:0}
  #diagram{break-before:page}
  .diagram-svg{max-height:90vh}
  a{color:#000;text-decoration:none}
}

/* ===================== Shared extensions: designer / build pages ===================== */
.viz-root{--surface-1:var(--card);--text-primary:var(--ink);--text-secondary:var(--ink-2);--text-muted:var(--muted);--grid-line:var(--line);
  --series-1:#2a78d6;--series-2:#eb6834;--series-3:#1baf7a}
:root[data-theme="dark"] .viz-root{--series-1:#3987e5;--series-2:#d95926;--series-3:#199e70}
@media (prefers-color-scheme: dark){:root:where(:not([data-theme="light"])) .viz-root{--series-1:#3987e5;--series-2:#d95926;--series-3:#199e70}}
.subnav{position:sticky;top:61px;z-index:40;background:var(--paper);background:color-mix(in srgb,var(--paper) 90%,transparent);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.subnav .wrap{display:flex;gap:4px;overflow-x:auto;padding-top:6px;padding-bottom:6px;scrollbar-width:none}
.subnav a{padding:6px 11px;border-radius:999px;color:var(--ink-2);text-decoration:none;font-weight:600;font-size:.84rem;white-space:nowrap}
.subnav a:hover{background:var(--card-2)}
.subnav a.active{background:var(--accent-soft);color:var(--accent-ink)}
@media (max-width:760px){.subnav{top:104px}}
.step-num{display:inline-grid;place-items:center;width:26px;height:26px;border-radius:8px;background:var(--accent-soft);color:var(--accent-ink);font-family:var(--mono);font-size:.8rem;font-weight:700}
.dsec{padding:34px 0 8px;scroll-margin-top:120px}
.dsec>.wrap>.section-head h2{display:flex;align-items:center;gap:10px;font-size:1.35rem}
.two-col{display:grid;gap:22px;grid-template-columns:1fr;align-items:start}
@media (min-width:1000px){.two-col{grid-template-columns:minmax(320px,400px) 1fr}}
.two-col>*{min-width:0}
.three{display:grid;gap:10px;grid-template-columns:repeat(auto-fit,minmax(min(100%,150px),1fr))}
.stats{display:grid;gap:12px;grid-template-columns:repeat(auto-fill,minmax(min(100%,170px),1fr))}
.stat{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:12px 14px;box-shadow:var(--shadow);display:flex;flex-direction:column;gap:2px}
.stat .lbl{font-size:.8rem;font-weight:650;color:var(--ink-2);display:flex;gap:6px;align-items:center;flex-wrap:wrap}
.stat .lbl .tag{margin-left:auto}
.stat .val{font-size:1.5rem;font-weight:750;font-variant-numeric:tabular-nums;letter-spacing:-.02em}
.stat .val small{font-size:.85rem;color:var(--muted);font-weight:600;margin-left:4px}
.stat .note{font-size:.76rem;color:var(--muted)}
.stat.is-warn{border-color:var(--amber-line);box-shadow:inset 3px 0 0 var(--amber-line),var(--shadow)}
.stat.is-ok{box-shadow:inset 3px 0 0 var(--ok),var(--shadow)}
.breakdown{display:flex;height:14px;border-radius:7px;overflow:hidden;gap:2px;background:var(--card-2);margin:10px 0 6px}
.breakdown span{display:block;height:100%}
.legend{display:flex;flex-wrap:wrap;gap:6px 14px;font-size:.8rem;color:var(--ink-2)}
.legend i{display:inline-block;width:10px;height:10px;border-radius:3px;margin-right:6px;vertical-align:-1px}
.legend i.line{height:3px;width:16px;border-radius:2px;vertical-align:3px}
.chart-card{padding:14px 16px}
.chart-card h3{font-size:1rem;margin-bottom:2px}
.chart-wrap{position:relative}
.chart-wrap svg{display:block;width:100%;height:auto;overflow:visible}
.chart-tip{position:absolute;pointer-events:none;background:var(--card);border:1px solid var(--line);box-shadow:var(--shadow);border-radius:8px;padding:6px 9px;font-size:.78rem;font-variant-numeric:tabular-nums;white-space:nowrap;opacity:0;transition:opacity .12s;z-index:5;color:var(--ink)}
.chart-tip.show{opacity:1}
.chart-tip b{display:block;margin-bottom:2px}
.chart-tip .k{display:inline-block;width:12px;height:3px;border-radius:2px;margin-right:6px;vertical-align:3px}
.charts{display:grid;gap:16px;grid-template-columns:repeat(auto-fit,minmax(min(100%,420px),1fr))}
details.tableview{margin-top:8px}
details.tableview>summary{cursor:pointer;font-size:.8rem;font-weight:700;color:var(--accent-ink)}
.mini-table{max-height:240px;overflow:auto;margin-top:6px}
.mini-table table{font-size:.78rem}
.mini-table th,.mini-table td{padding:4px 8px;border-bottom:1px solid var(--line);text-align:right}
.mini-table th:first-child,.mini-table td:first-child{text-align:left}
.panels-table input{min-height:34px;padding:5px 7px}
.panels-table th,.panels-table td{padding:4px 4px;font-size:.82rem;text-align:left}
.viewer{position:relative;border-radius:12px;overflow:hidden;background:var(--d-paper);border:1px solid var(--line);touch-action:none}
.viewer canvas{display:block;width:100%;height:auto;cursor:grab;aspect-ratio:16/10}
.viewer canvas:active{cursor:grabbing}
.viewer .hint{position:absolute;left:12px;bottom:10px;margin:0;color:var(--d-dim);font-size:.76rem;pointer-events:none}
.toolbar{display:flex;flex-wrap:wrap;gap:6px;margin-top:10px}
.toolbar .btn{padding:7px 11px;font-size:.84rem}
.btn.sm{padding:6px 10px;font-size:.82rem}
.btn.danger:hover{border-color:var(--bad);color:var(--bad)}
.page-grid{display:grid;gap:12px;grid-template-columns:repeat(auto-fill,minmax(130px,1fr));margin-top:12px}
.page-thumb{background:#fff;border:1px solid var(--line);border-radius:6px;box-shadow:var(--shadow);overflow:hidden;position:relative}
.page-thumb svg{display:block;width:100%;height:auto}
.page-thumb span{position:absolute;right:6px;bottom:4px;font-size:.7rem;font-weight:700;color:#334;background:rgba(255,255,255,.85);padding:1px 5px;border-radius:4px}
.sheet-preview{background:#fff;border-radius:10px;border:1px solid var(--line);overflow:auto;max-height:640px}
.sheet-preview svg{display:block;width:100%;height:auto}
.callout{display:flex;gap:10px;padding:12px 14px;border-radius:var(--radius-sm);font-size:.88rem;border:1px solid color-mix(in srgb,var(--accent) 30%,transparent);background:var(--accent-soft);margin:12px 0}
.callout .ico{color:var(--accent-ink)}
.callout.warn{background:var(--amber-soft);border-color:color-mix(in srgb,var(--amber-line) 45%,transparent)}
.callout.warn .ico{color:var(--amber)}
.flow{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin:8px 0 0}
.flow .arrow{color:var(--muted)}
.hero-links{display:grid;gap:14px;grid-template-columns:repeat(auto-fit,minmax(min(100%,260px),1fr))}
.hero-links a.card{display:block;padding:18px;text-decoration:none;color:var(--ink);transition:border-color .15s,transform .15s}
.hero-links a.card:hover{border-color:var(--accent);transform:translateY(-1px)}
.hero-links a.card b{display:flex;align-items:center;gap:8px;font-size:1.05rem;margin-bottom:6px}
.hero-links a.card p{margin:0;color:var(--ink-2);font-size:.9rem}
.cmp th,.cmp td{white-space:nowrap}
.cmp td{text-align:right;font-variant-numeric:tabular-nums}
.cmp tr td:first-child,.cmp tr th:first-child{text-align:left}
#print-pages{display:none}
@media print{
  body.printing-templates>*:not(#print-pages){display:none!important}
  body.printing-templates #print-pages{display:block!important}
  body.printing-templates{background:#fff!important}
  #print-pages svg{display:block;break-after:page;page-break-after:always}
  .subnav,.viewer .hint,.toolbar{display:none!important}
}
.actions .field{min-width:0;max-width:100%}
#st-sm{width:100%;max-width:100%}
.chart-wrap{max-width:100%;overflow:hidden}
.table-scroll,.mini-table,.page-grid,.sheet-preview{position:relative}
.data tbody th{text-transform:none;letter-spacing:0;font-size:.86rem;font-weight:600;color:var(--ink)}
.dsec .section-head{display:block}
.dsec .section-head .lede{margin-top:6px}

/* ===================== Simulator ===================== */
.sim-page{overflow:hidden;height:100vh;height:100dvh;display:flex;flex-direction:column}
.sim-page .topbar{position:relative}
.sim-shell{flex:1;min-height:0;display:grid;grid-template-columns:1fr 380px}
.sim-shell.panel-hidden{grid-template-columns:1fr 0}
.sim-shell.panel-hidden .sim-panel{display:none}
@media (max-width:900px){.sim-shell{grid-template-columns:1fr;grid-template-rows:1fr auto}.sim-panel{max-height:46vh}}
.sim-view{position:relative;min-height:0;background:#0b1a30;overflow:hidden}
#sim-canvas{display:block;width:100%;height:100%;outline:none;touch-action:none}
#sim-canvas:focus-visible{box-shadow:inset 0 0 0 3px var(--accent)}
.sim-panel{background:var(--card);border-left:1px solid var(--line);overflow:auto;min-height:0;display:flex;flex-direction:column}
.sim-tabs{display:flex;flex-wrap:wrap;gap:2px;padding:8px;border-bottom:1px solid var(--line);position:sticky;top:0;background:var(--card);z-index:2}
.sim-tabs [role=tab]{font:inherit;font-size:.8rem;font-weight:700;border:0;background:transparent;color:var(--ink-2);padding:6px 9px;border-radius:8px;cursor:pointer}
.sim-tabs [role=tab][aria-selected=true]{background:var(--accent-soft);color:var(--accent-ink)}
.sim-pane{padding:12px 14px 20px}
.sub-h{font-size:.92rem;margin:16px 0 6px}
.hud{position:absolute;pointer-events:none;color:#fff;font-variant-numeric:tabular-nums;text-shadow:0 1px 2px rgba(0,0,0,.6)}
.hud-tl{left:12px;top:12px;background:rgba(6,16,30,.55);border:1px solid rgba(255,255,255,.12);border-radius:12px;padding:10px 12px;font-size:.82rem;min-width:190px;backdrop-filter:blur(4px)}
.hud-tl .hrow{display:flex;justify-content:space-between;gap:12px}
.hud-tl .hrow b{font-size:1.02rem}
.hud-tl .bar{height:6px;border-radius:3px;background:rgba(255,255,255,.18);margin:3px 0 6px;overflow:hidden}
.hud-tl .bar i{display:block;height:100%;background:#4cc9f0;border-radius:3px}
.hud-tl .bar i.low{background:#ffb020}.hud-tl .bar i.crit{background:#ff4d4d}
.hud-tc{left:50%;top:14px;transform:translateX(-50%);text-align:center;font-weight:800;font-size:1.05rem;letter-spacing:.04em}
.hud-tc .msg{display:inline-block;padding:7px 14px;border-radius:10px;background:rgba(6,16,30,.6);margin:2px}
.hud-tc .msg.warn{background:rgba(180,83,9,.85)}.hud-tc .msg.bad{background:rgba(185,28,28,.88)}.hud-tc .msg.ok{background:rgba(21,128,61,.85)}
.hud-tr{right:12px;top:12px;display:flex;gap:6px;pointer-events:auto;flex-wrap:wrap;justify-content:flex-end;max-width:60%}
.hud-btn{font:inherit;font-size:.78rem;font-weight:700;color:#fff;background:rgba(6,16,30,.6);border:1px solid rgba(255,255,255,.2);border-radius:9px;padding:6px 10px;cursor:pointer}
.hud-btn:hover{background:rgba(8,145,178,.7)}
.hud-btn[aria-pressed=true]{background:rgba(8,145,178,.85)}
.hud-bl{left:12px;bottom:12px;display:flex;gap:8px;align-items:flex-end}
.hud-bl .stk{width:64px;height:64px;border:1px solid rgba(255,255,255,.35);border-radius:10px;background:rgba(6,16,30,.45);position:relative}
.hud-bl .stk i{position:absolute;width:10px;height:10px;border-radius:50%;background:#4cc9f0;transform:translate(-50%,-50%);box-shadow:0 0 0 2px rgba(6,16,30,.6)}
.hud-bl .thr{width:10px;height:64px;border-radius:5px;background:rgba(255,255,255,.18);position:relative;overflow:hidden}
.hud-bl .thr i{position:absolute;left:0;right:0;bottom:0;background:#ffb020}
.hud-bl small{display:block;font-size:.66rem;opacity:.8;text-align:center}
.hud-br{right:12px;bottom:12px;display:flex;gap:6px;flex-wrap:wrap;justify-content:flex-end;max-width:60%}
.hud-br span{font-size:.72rem;font-weight:700;padding:4px 8px;border-radius:999px;background:rgba(6,16,30,.6);border:1px solid rgba(255,255,255,.18)}
.hud-lesson{left:50%;bottom:14px;transform:translateX(-50%);background:rgba(6,16,30,.68);border:1px solid rgba(255,255,255,.18);border-radius:12px;padding:10px 14px;max-width:min(560px,80%);font-size:.88rem;text-align:center}
.hud-lesson b{color:#ffd166}
.sim-fallback{position:absolute;inset:0;display:grid;place-items:center;padding:24px;background:var(--paper);color:var(--ink);text-align:center}
.lesson-list{display:grid;gap:8px}
.lesson-list .card{padding:12px}
.lesson-list .card b{display:block}
.lesson-list .card p{margin:4px 0 8px;font-size:.84rem;color:var(--ink-2)}
.wiz{margin:10px 0}
.wiz-axes{display:grid;gap:4px;margin:8px 0}
.wiz-axes div{display:grid;grid-template-columns:52px 1fr;gap:8px;align-items:center;font-size:.76rem;color:var(--muted)}
.wiz-axes .ab{height:8px;background:var(--card-2);border-radius:4px;position:relative;overflow:hidden}
.wiz-axes .ab i{position:absolute;top:0;bottom:0;width:6px;background:var(--accent);border-radius:3px;transform:translateX(-50%)}
.dev{display:flex;gap:10px;align-items:center;justify-content:space-between;border:1px solid var(--line);border-radius:10px;padding:8px 10px;margin:6px 0;font-size:.86rem}
.dev b{display:block}
.vstick{position:absolute;bottom:90px;width:130px;height:130px;border-radius:50%;background:rgba(6,16,30,.35);border:1px solid rgba(255,255,255,.35);touch-action:none;pointer-events:auto}
.vstick span{position:absolute;left:50%;top:50%;width:46px;height:46px;border-radius:50%;background:rgba(76,201,240,.7);transform:translate(-50%,-50%)}
.vstick-l{left:24px}.vstick-r{right:24px}
[hidden]{display:none!important}
.hud-lesson{bottom:54px}
#t-table td{white-space:normal}
@media (max-width:900px){
  .sim-shell{grid-template-rows:minmax(300px,58vh) auto}
  .hud-tl{font-size:.72rem;min-width:0;padding:7px 9px}
  .hud-tl .hrow:nth-child(n+6),.hud-tl .bar:nth-of-type(2)~*{display:none}
  .hud-br{display:none}.hud-bl .stk{width:48px;height:48px}.hud-bl .thr{height:48px}
  .hud-lesson{bottom:66px;font-size:.78rem}
}
.hud-bl .stk i.hint{background:transparent;border:2px solid #ffd166;box-shadow:none;width:12px;height:12px}

/* "i" information buttons + shared tooltip (assets/rc-info.js) */
.info-i{display:inline-flex;align-items:center;justify-content:center;width:15px;height:15px;margin:0 2px 0 5px;border-radius:50%;border:1.5px solid var(--muted);color:var(--muted);font:italic 700 10px/1 Georgia,"Times New Roman",serif;vertical-align:1px;cursor:help;user-select:none;flex:none;text-transform:none;letter-spacing:0}
.info-i:hover,.info-i:focus-visible{border-color:var(--accent,#0e7490);color:var(--accent,#0e7490);outline:none;box-shadow:0 0 0 3px color-mix(in srgb,var(--accent,#0e7490) 25%,transparent)}
.rc-tip{position:fixed;z-index:10000;max-width:340px;padding:10px 12px;border-radius:10px;background:var(--card,#fff);color:var(--ink-2,#2c4a6e);border:1px solid var(--line,#d3dde9);box-shadow:0 10px 30px rgba(11,37,69,.22);font-family:inherit;font-size:13px;font-weight:400;line-height:1.45;pointer-events:none;text-transform:none;letter-spacing:0}
.rc-tip b{display:block;color:var(--ink,#0b2545);font-size:13.5px;margin-bottom:3px}
.rc-tip small{display:block;margin-top:6px;color:var(--muted,#566a82);font-size:12px}
.rc-tip[hidden]{display:none!important}
@media print{.info-i,.rc-tip{display:none!important}}

/* ---------- guide page (guide.html) ---------- */
.g-tocgrid{display:grid;gap:8px;grid-template-columns:repeat(auto-fill,minmax(min(100%,190px),1fr));margin:6px 0 4px}
.g-tocitem{display:flex;gap:10px;align-items:center;padding:10px 12px;border:1px solid var(--line);border-radius:12px;background:var(--card);color:var(--ink);text-decoration:none;font-weight:650;font-size:.92rem}
.g-tocitem small{display:block;color:var(--muted);font-weight:600;font-size:.72rem;letter-spacing:.04em;text-transform:uppercase}
.g-tocitem .ico{color:var(--accent-ink);width:22px;height:22px;flex:none}
.g-tocitem:hover{border-color:var(--accent)}
.g-tocitem.ex{background:var(--accent-soft)}
.g-ch{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:18px 20px;margin:0 0 18px;scroll-margin-top:110px}
.g-ch h3{margin:0 0 8px;font-size:1.2rem;color:var(--ink)}
.g-ch p,.g-ch li{color:var(--ink-2);line-height:1.55}
.g-grid2{display:grid;gap:16px;grid-template-columns:repeat(auto-fit,minmax(min(100%,340px),1fr));align-items:start}
.g-grid2.tight{gap:0 14px}
.g-list{margin:6px 0;padding-left:1.2em;display:grid;gap:6px}
.g-steps{margin:6px 0;padding-left:1.4em;display:grid;gap:6px}
.widget{background:var(--card-2);border:1px solid var(--line);border-radius:14px;padding:14px 16px;margin:12px 0}
.widget h4{margin:0 0 8px;font-size:.95rem;color:var(--ink)}
.widget .field{margin:0 0 8px}
.widget .stats{margin-top:8px}
.g-fig{display:block;width:100%;max-width:560px;height:auto;margin:6px auto}
.g-fig a .g-node rect{transition:fill .15s}
.g-fig a:hover .g-node rect,.g-fig a:focus .g-node rect{fill:var(--accent-soft)}
.g-verdict{display:flex;gap:8px;align-items:flex-start;margin:8px 0 0;padding:8px 10px;border-radius:10px;font-size:.92rem;color:var(--ink)}
.g-verdict .ico,.g-verdict svg{width:18px;height:18px;flex:none;margin-top:1px}
.g-verdict.ok{background:color-mix(in srgb,#16a34a 12%,transparent)}
.g-verdict.warn{background:var(--amber-soft)}
.g-verdict.bad{background:color-mix(in srgb,#dc2626 13%,transparent)}
.concept,.practical{border-radius:10px;padding:10px 12px;margin:10px 0;line-height:1.5;color:var(--ink-2)}
.concept{background:var(--accent-soft);border-left:3px solid var(--accent)}
.practical{background:var(--card-2);border-left:3px solid var(--amber-line)}
.concept b,.practical b{color:var(--ink)}
.practical ol{margin:6px 0 0;padding-left:1.3em;display:grid;gap:4px}
.g-bars{display:grid;gap:6px;margin-top:10px}
.g-bar{display:grid;grid-template-columns:minmax(90px,30%) 1fr auto;gap:8px;align-items:center;font-size:.85rem;color:var(--ink-2)}
.g-bar i{display:block;height:10px;border-radius:5px;background:color-mix(in srgb,var(--accent) 45%,transparent)}
.g-bar.on i{background:var(--accent)}
.g-bar.on span{font-weight:700;color:var(--ink)}
.g-scale{position:relative;height:74px;margin:30px 4px 8px;border-radius:8px;background:var(--card);border:1px solid var(--line)}
.g-scale .band{position:absolute;top:0;bottom:0;background:color-mix(in srgb,#16a34a 18%,transparent)}
.g-scale .np,.g-scale .cgm{position:absolute;top:-4px;bottom:-4px;width:3px;margin-left:-1.5px}
.g-scale .np{background:var(--ink)}
.g-scale .cgm{background:var(--amber-line);width:5px;margin-left:-2.5px;border-radius:3px}
.g-scale .np span,.g-scale .cgm span{position:absolute;top:-22px;left:50%;transform:translateX(-50%);white-space:nowrap;font-size:.78rem;font-weight:700;color:var(--ink)}
.g-scale .cgm span{top:auto;bottom:-22px;color:var(--amber)}
.g-scale .ticks i{position:absolute;bottom:4px;font-style:normal;font-size:.7rem;color:var(--muted);transform:translateX(-50%)}
.g-exhead{margin-bottom:16px}
.g-diagram svg{width:100%;height:auto;border-radius:10px}
.g-progress{display:flex;gap:12px;align-items:center;margin:12px 0 4px;font-size:.9rem;color:var(--ink-2)}
.g-progress span{flex:1;height:8px;border-radius:4px;background:var(--line);overflow:hidden}
.g-progress i{display:block;height:100%;background:var(--accent)}
.g-step{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:16px 18px;margin:0 0 14px;scroll-margin-top:110px}
.g-step.done{border-color:color-mix(in srgb,#16a34a 55%,var(--line))}
.g-step header{display:flex;gap:10px;align-items:center;margin-bottom:8px}
.g-step header h3{margin:0;flex:1;font-size:1.08rem;color:var(--ink)}
.g-step .g-done{margin:0;font-size:.85rem}
.g-step p{color:var(--ink-2);line-height:1.55}
.g-sheet{max-height:420px;overflow:auto;border:1px solid var(--line);border-radius:10px;background:#fff}
.g-sheet svg{width:100%;height:auto;min-width:520px}
.g-gloss{display:grid;gap:14px}
.g-gletter h3{margin:6px 0;font-size:1.1rem;color:var(--accent-ink)}
.g-gletter{display:grid;gap:8px}
.g-term{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:10px 12px}
.g-term b{color:var(--ink)}
.g-term p{margin:4px 0 0;color:var(--ink-2);line-height:1.5;font-size:.92rem}
.g-term small{display:block;margin-top:4px;color:var(--muted)}
@media print{.widget,.g-toc,.g-exhead .actions,.g-done{display:none!important}.g-ch,.g-step{break-inside:avoid}}

.widget:has(.w-ctl){display:grid;gap:8px 22px;grid-template-columns:minmax(260px,380px) 1fr;align-items:start}
.widget .w-ctl .g-grid2.tight{grid-template-columns:1fr 1fr}
.g-ch .g-grid2 .widget:has(.w-ctl){grid-template-columns:1fr}
@media (max-width:820px){.widget:has(.w-ctl){grid-template-columns:1fr}.widget .w-ctl .g-grid2.tight{grid-template-columns:1fr}}
.stat.is-text .val{font-size:1.02rem;line-height:1.3}
.g-gletter{grid-template-columns:repeat(auto-fill,minmax(min(100%,300px),1fr))}
.g-gletter h3{grid-column:1/-1}

/* ---------- simulator: on-screen remote (phones, tablets, mouse) ---------- */
.remote{position:absolute;left:0;right:0;bottom:0;display:flex;align-items:flex-end;justify-content:space-between;gap:10px;pointer-events:none;
  padding:10px max(14px,env(safe-area-inset-right)) max(12px,env(safe-area-inset-bottom)) max(14px,env(safe-area-inset-left));z-index:5}
.gimbal{pointer-events:auto;touch-action:none;user-select:none;-webkit-user-select:none;-webkit-touch-callout:none;position:relative;container-type:size;
  width:clamp(120px,min(36vh,30vw),220px);aspect-ratio:1;border-radius:22px;background:rgba(6,16,30,.42);border:1.5px solid rgba(255,255,255,.32);
  box-shadow:inset 0 0 0 6px rgba(255,255,255,.04),0 6px 18px rgba(0,0,0,.25);backdrop-filter:blur(3px)}
.gimbal.active{border-color:rgba(76,201,240,.85)}
.gimbal .gb-x,.gimbal .gb-y{position:absolute;background:rgba(255,255,255,.22)}
.gimbal .gb-x{left:12%;right:12%;top:50%;height:1px}.gimbal .gb-y{top:12%;bottom:12%;left:50%;width:1px}
.gimbal .knob{position:absolute;left:50%;top:50%;width:30%;height:30%;border-radius:50%;transform:translate(-50%,-50%);
  background:radial-gradient(circle at 35% 30%,#9be7fb,#22a6c9 60%,#0e6f88);box-shadow:0 3px 10px rgba(0,0,0,.45),inset 0 -2px 4px rgba(0,0,0,.25)}
.gimbal .gb-lab{position:absolute;left:0;right:0;bottom:-18px;text-align:center;font-size:.62rem;font-weight:700;color:rgba(255,255,255,.85);text-shadow:0 1px 2px rgba(0,0,0,.7);letter-spacing:.02em}
.gimbal .gb-thr{position:absolute;top:12%;bottom:12%;width:6px;border-radius:3px;background:rgba(255,255,255,.18);overflow:hidden;left:6px}
#gb-right .gb-thr{left:auto;right:6px}
.gimbal .gb-thr i{position:absolute;left:0;right:0;bottom:0;background:#ffb020}
.remote-mid{pointer-events:auto;display:grid;grid-template-columns:1fr 1fr;gap:6px;margin-bottom:16px}
.remote-mid .sw{font:inherit;font-size:.72rem;font-weight:800;color:#fff;background:rgba(6,16,30,.62);border:1px solid rgba(255,255,255,.25);border-radius:10px;padding:9px 10px;min-width:72px;touch-action:manipulation}
.remote-mid .sw:active,.remote-mid .sw.on{background:rgba(8,145,178,.9)}
body.remote-on .hud-bl{display:none}
body.remote-on .hud-br{bottom:auto;top:56px}
body.remote-on .hud-lesson{bottom:auto;top:96px}
.rotate-hint{position:absolute;inset:0;display:grid;place-items:center;padding:24px;background:rgba(6,16,30,.78);color:#fff;text-align:center;z-index:8}
.rotate-hint b{font-size:1.15rem}.rotate-hint p{margin:8px 0 14px;opacity:.9}
/* compact (phones): no page header, smaller HUD, full-height flight view */
body.sim-compact .topbar{display:none}
body.sim-compact .hud-tl{font-size:.68rem;min-width:140px;padding:6px 8px;left:max(8px,env(safe-area-inset-left));top:8px}
body.sim-compact .hud-tl .hrow b{font-size:.84rem}
body.sim-compact .hud-tr{top:8px;right:max(8px,env(safe-area-inset-right))}
body.sim-compact .hud-btn{font-size:.7rem;padding:5px 8px}
body.sim-compact .hud-tc{font-size:.8rem;top:44px}
@media (orientation:portrait){body.remote-on .remote{padding-bottom:max(18px,env(safe-area-inset-bottom))}body.remote-on .remote-mid{grid-template-columns:1fr}}
body.sim-compact .sim-shell{grid-template-columns:1fr;grid-template-rows:1fr auto}
body.sim-compact .sim-shell.panel-hidden{grid-template-columns:1fr;grid-template-rows:1fr}
@media (orientation:landscape){body.sim-compact .sim-shell{grid-template-columns:1fr min(340px,45vw);grid-template-rows:1fr}body.sim-compact .sim-panel{max-height:none}body.sim-compact .sim-shell.panel-hidden{grid-template-columns:1fr}}