[hidden] { display: none !important; }
:root {
  --paper: #fbf7f1; --card: #ffffff; --grout: #f3ece2; --text: #2a2522; --text-soft: #5a504a; --quiet: #6f645c; --rule: #e6dccf;
  --clay: #8a3b2a; --on-clay: #fff; --sage: #2f6f6a; --sage-wash: #e4f0ee; --corner: 6px;
  --lift: 0 1px 0 rgba(42, 37, 34, .06);
  --head-font: Georgia, "Iowan Old Style", "Palatino Linotype", serif;
  --body-font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --num-font: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}
@media (prefers-color-scheme: dark) { :root {
  --paper: #1a1715; --card: #221e1b; --grout: #2b2622; --text: #f1ebe4; --text-soft: #cfc5bb; --quiet: #9a8e85; --rule: #3a332e;
  --clay: #e08a6e; --on-clay: #1a1715; --sage: #7cc3bb; --sage-wash: #1f3331; --lift: none; } }
* { box-sizing: border-box; }
body { margin: 0; background: var(--paper); color: var(--text); font: 16px/1.65 var(--body-font); }
a { color: var(--clay); text-underline-offset: 3px; } a:hover { color: var(--sage); }
.frame { max-width: 1040px; margin: 0 auto; padding: 0 16px; }
.jump-link { position: absolute; left: -999px; } .jump-link:focus { left: 16px; top: 8px; background: var(--card); padding: 8px; z-index: 10; }
.masthead { background: var(--card); border-bottom: 1px solid var(--rule); }
.masthead-row { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 64px; flex-wrap: wrap; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; font: 600 20px var(--head-font); }
.brand b { color: var(--clay); font-weight: 700; }
.brand-tile { width: 22px; height: 22px; fill: var(--clay); }
.sections { display: flex; gap: 22px; flex-wrap: wrap; font-size: 15px; }
.sections a { color: var(--text-soft); text-decoration: none; font-weight: 600; padding: 4px 0; }
.sections a:hover, .sections a[aria-current] { color: var(--text); box-shadow: inset 0 -2px 0 var(--clay); }
.trail ol { list-style: none; display: flex; flex-wrap: wrap; gap: 6px; padding: 0; margin: 20px 0 0; font-size: 14px; color: var(--quiet); }
.trail li + li::before { content: "›"; margin-right: 6px; } .trail a { color: var(--text-soft); }
.intro { margin: 14px 0 22px; }
h1 { font: 600 clamp(30px, 4.4vw, 44px)/1.15 var(--head-font); letter-spacing: -.01em; margin: 0 0 10px; }
h2 { font: 600 clamp(22px, 2.8vw, 28px)/1.25 var(--head-font); margin: 44px 0 14px; }
h3 { font-size: 18px; margin: 22px 0 8px; }
.standfirst { font-size: 18px; color: var(--text-soft); max-width: 740px; margin: 0; }
.quick-answer { border: 1px solid var(--rule); border-left: 4px solid var(--sage); background: var(--sage-wash); padding: 12px 16px; border-radius: var(--corner); max-width: 740px; margin: 0 0 22px; }
.workbench { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 18px; align-items: start; }
@media (max-width: 820px) { .workbench { grid-template-columns: 1fr; } }
.panel { background: var(--card); border: 1px solid var(--rule); border-radius: var(--corner); box-shadow: var(--lift); padding: 20px; }
.panel h2 { margin-top: 0; font-size: 20px; }
.inputs { display: grid; gap: 14px; }
.input-row label, .input-row .input-label { display: block; font-weight: 600; font-size: 14px; margin-bottom: 6px; }
.fine { font-size: 13px; color: var(--quiet); margin-top: 4px; }
.two-up { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; } .three-up { display: grid; grid-template-columns: 1fr 1fr 34px; gap: 8px; align-items: end; }
.with-unit { position: relative; } .with-unit input { padding-right: 40px; }
.with-unit span { position: absolute; right: 12px; top: 50%; transform: translateY(-50%); color: var(--quiet); font-size: 14px; pointer-events: none; }
input[type=number], select { width: 100%; font: 600 17px/1.2 var(--body-font); color: var(--text); background: var(--paper); border: 1px solid var(--rule); border-radius: var(--corner); padding: 11px 12px; -moz-appearance: textfield; }
input::-webkit-inner-spin-button { -webkit-appearance: none; }
input:focus, select:focus { outline: 2px solid var(--sage); outline-offset: 0; }
.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chips button, .chip-small { font: 600 14px var(--body-font); border: 1px solid var(--rule); background: var(--paper); color: var(--text-soft); border-radius: var(--corner); padding: 7px 11px; cursor: pointer; }
.chips button[aria-pressed=true] { background: var(--clay); border-color: var(--clay); color: var(--on-clay); }
.chip-small { padding: 8px 0; text-align: center; }
.readout { position: sticky; top: 12px; }
.headline-num { display: flex; align-items: baseline; gap: 8px; flex-wrap: wrap; }
.headline-num output { font: 700 clamp(40px, 6vw, 54px)/1 var(--head-font); color: var(--clay); }
.headline-num span { font-weight: 600; color: var(--text-soft); }
.readout-detail { color: var(--quiet); font-size: 14px; margin: 6px 0 14px; }
.supplies { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; margin: 14px 0; }
.supply { background: var(--grout); border-radius: var(--corner); padding: 10px; text-align: center; }
.supply output { display: block; font: 700 24px/1.1 var(--head-font); } .supply small { color: var(--quiet); font-size: 12px; }
.plan-view { width: 100%; height: auto; display: block; margin: 0 0 10px; border: 1px solid var(--rule); border-radius: var(--corner); background: var(--grout); }
.plan-view text { font: 600 11px var(--body-font); fill: var(--text-soft); }
.tools-row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
.button { font: 600 14px var(--body-font); border: 1px solid var(--clay); color: var(--clay); background: transparent; border-radius: var(--corner); padding: 9px 14px; cursor: pointer; }
.button-filled { background: var(--clay); color: var(--on-clay); }
.aside-note { font-size: 13px; color: var(--quiet); margin: 10px 0 0; }
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 14px; }
.calc-card { display: block; background: var(--card); border: 1px solid var(--rule); border-top: 3px solid var(--clay); border-radius: var(--corner); padding: 16px 18px; text-decoration: none; color: var(--text); }
a.calc-card:hover { border-color: var(--sage); color: var(--text); }
.calc-card h3 { margin: 0 0 4px; font: 600 18px var(--head-font); } .calc-card p { margin: 0; color: var(--text-soft); font-size: 14px; }
.calc-card-icon { font-size: 12px; font-weight: 700; color: var(--sage); text-transform: uppercase; letter-spacing: .06em; }
.calc-card-later { opacity: .6; border-top-color: var(--rule); } .calc-card-later .calc-card-icon::after { content: " · soon"; color: var(--quiet); }
.scroll-table { overflow-x: auto; border: 1px solid var(--rule); border-radius: var(--corner); background: var(--card); }
table { width: 100%; border-collapse: collapse; font-size: 15px; }
th, td { text-align: left; padding: 10px 14px; border-bottom: 1px solid var(--rule); white-space: nowrap; }
th { background: var(--grout); font-size: 13px; color: var(--text-soft); } td.n-cell { font-variant-numeric: tabular-nums; }
tr:last-child td { border-bottom: 0; }
.math { font-family: var(--num-font); font-size: 14px; background: var(--card); border: 1px dashed var(--rule); border-radius: var(--corner); padding: 12px 14px; overflow-x: auto; }
.copy { max-width: 740px; } .copy li { margin: 4px 0; }
details { background: var(--card); border: 1px solid var(--rule); border-radius: var(--corner); padding: 12px 16px; margin: 8px 0; max-width: 740px; }
summary { font-weight: 600; cursor: pointer; }
.source-line { font-size: 14px; color: var(--quiet); border-top: 1px solid var(--rule); margin-top: 40px; padding-top: 14px; }
.opener { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr); gap: 22px; align-items: start; }
@media (max-width: 820px) { .opener { grid-template-columns: 1fr; } }
.colophon { margin-top: 64px; border-top: 1px solid var(--rule); background: var(--card); }
.colophon-cols { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 24px; padding-top: 26px; color: var(--text-soft); font-size: 14px; }
@media (max-width: 680px) { .colophon-cols { grid-template-columns: 1fr 1fr; } .colophon-cols > :first-child { grid-column: 1 / -1; } }
.colophon-h { font: 600 15px var(--head-font); color: var(--text); margin: 0 0 8px; }
.colophon-cols p { margin: 0; }
.colophon-links { list-style: none; padding: 0; margin: 0; display: grid; gap: 6px; } .colophon-links a { color: var(--text-soft); }
.colophon-note { color: var(--quiet); font-size: 13px; padding-top: 18px; padding-bottom: 26px; margin: 0 auto; }
@media print { .masthead, .colophon, .tools-row, .sections { display: none; } .panel { box-shadow: none; } }

/* ---------- Анимации (лёгкие, CSS + inline SVG; выключаются при prefers-reduced-motion) ---------- */
.ico { width: 34px; height: 34px; display: block; margin-bottom: 8px; fill: var(--grout); stroke: var(--clay); stroke-width: 1.6; }
.calc-card-later .ico { stroke: var(--quiet); }
a.calc-card:hover .ico-tile rect { animation: tile-pop .5s ease both; } a.calc-card:hover .ico-tile rect:nth-child(2) { animation-delay: .06s; }
a.calc-card:hover .ico-tile rect:nth-child(3) { animation-delay: .12s; } a.calc-card:hover .ico-tile rect:nth-child(4) { animation-delay: .18s; }
.calc-card:hover .ico-paint .roll { animation: roll .8s ease-in-out; } .calc-card:hover .ico-floor .cols-2 { animation: slide .6s ease; }
.calc-card:hover .ico-floor .cols-3 { animation: slide .6s .1s ease; } .calc-card:hover .ico-wall .strip { animation: unroll .7s ease; }
.calc-card:hover .ico-drywall .sheet { animation: tile-pop .5s ease; } .calc-card:hover .ico-trim .prof { animation: slide .6s ease; }
@keyframes tile-pop { 0% { transform: scale(.6); opacity: .2; } 70% { transform: scale(1.06); } 100% { transform: scale(1); opacity: 1; } }
@keyframes roll { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(14px); } }
@keyframes slide { from { transform: translateX(-30%); opacity: .3; } to { transform: none; opacity: 1; } }
@keyframes unroll { from { stroke-dasharray: 0 60; } to { stroke-dasharray: 60 0; } }
.ico rect, .ico path, .ico g { transform-box: fill-box; transform-origin: center; }

.opener-art { width: 100%; height: auto; display: block; margin: 6px 0 4px; }
.opener-art .floor { fill: var(--grout); stroke: var(--rule); }
.opener-art .lay-loop rect { fill: var(--card); stroke: var(--clay); stroke-width: 1.2; transform-box: fill-box; transform-origin: center; }
.moving .opener-art .lay-loop rect { animation: lay-loop 7s calc(var(--i) * .15s) infinite both; }
@keyframes lay-loop { 0% { opacity: 0; transform: translateY(-10px) scale(.85); } 6%, 82% { opacity: 1; transform: none; } 92%, 100% { opacity: 0; } }
.opener-art .trowel { fill: var(--sage); transform: translate(190px, 150px); }
.moving .opener-art .trowel { animation: trowel 7s linear infinite; }
@keyframes trowel { 0% { transform: translate(20px, 30px); } 50% { transform: translate(190px, 150px); } 82% { transform: translate(190px, 150px); opacity: 1; } 90%, 100% { transform: translate(20px, 30px); opacity: 0; } }

.plan-view .lay rect { animation: lay-in .35s calc(min(var(--i), 240) * 6ms) both ease-out; transform-box: fill-box; transform-origin: center; }
@keyframes lay-in { from { opacity: 0; transform: scale(.7); } to { opacity: 1; transform: none; } }
.pulse { animation: bump .3s ease; } @keyframes bump { 50% { transform: scale(1.08); } }
.headline-num output { display: inline-block; transform-origin: left bottom; }
.brand:hover .brand-tile path { animation: tile-pop .5s ease; }

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