:root{color-scheme:light;--ink:#193b43;--muted:#546b70;--line:#d6e1df;--paper:#fff;--canvas:#f3f7f6;--teal:#0d6670;--teal-dark:#084c54;--soft:#e0f1ef;--danger:#a8322c;--danger-soft:#fff0ee;--hit-rgb:30,150,80;--hit-line:#1e9650;--shadow:0 12px 35px rgba(17,54,59,.06);font-family:Inter,ui-sans-serif,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;font-synthesis:none}
*{box-sizing:border-box}
[hidden]{display:none!important}
html{scroll-behavior:smooth}
body{margin:0;background:var(--canvas);color:var(--ink);line-height:1.5}
button,input,select{font:inherit}
button{cursor:pointer}
a{color:var(--teal-dark);text-underline-offset:3px}
:focus-visible{outline:3px solid #db7c28;outline-offset:3px}
.skip-link{position:absolute;top:-100px;left:12px;z-index:10;background:#fff;padding:10px 14px;border-radius:8px}
.skip-link:focus{top:12px}
h1,h2,h3,p{margin-top:0}
.app-header{max-width:1280px;margin:auto;padding:34px 26px 24px;display:flex;gap:19px;align-items:flex-start}
.brand-mark{width:66px;height:66px;flex:none;border-radius:17px;background:var(--soft);display:grid;place-items:center;box-shadow:var(--shadow)}
.brand-mark img{width:58px;height:58px}
.header-copy{min-width:0}
.eyebrow{margin:0 0 5px;text-transform:uppercase;letter-spacing:.12em;font-size:.73rem;font-weight:800;color:var(--teal)}
h1{font-size:clamp(1.55rem,3vw,2.6rem);line-height:1.12;letter-spacing:-.035em;margin-bottom:8px}
.header-subtitle{color:var(--muted);margin-bottom:0;max-width:70ch}
main{max-width:1280px;margin:0 auto;padding:0 26px 30px;display:grid;gap:18px}
.panel{background:var(--paper);border:1px solid var(--line);border-radius:19px;box-shadow:var(--shadow);padding:25px;min-width:0}
.panel-heading{display:flex;align-items:center;gap:13px;margin-bottom:14px;min-width:0}
.panel-heading h2{font-size:1.28rem;line-height:1.2;letter-spacing:-.02em;margin:0}
.step-number{width:37px;height:37px;display:grid;place-items:center;border:1px solid #a7ceca;border-radius:11px;background:var(--soft);color:var(--teal-dark);font-size:.82rem;font-weight:800;flex:none}
.print-button{margin-left:auto}

/* Настройки */
.settings>summary{display:flex;align-items:center;gap:13px;cursor:pointer;list-style:none;min-width:0}
.settings>summary::-webkit-details-marker{display:none}
.settings>summary::after{content:"▾";margin-left:auto;color:var(--teal-dark);font-size:1.1rem;flex:none;transition:transform .15s}
.settings:not([open])>summary::after{transform:rotate(-90deg)}
.summary-copy{display:grid;min-width:0}
.summary-title{font-size:1.28rem;font-weight:800;letter-spacing:-.02em;line-height:1.2}
.summary-state{font-size:.82rem;color:var(--muted);overflow-wrap:anywhere}
.settings-body{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:22px;margin-top:20px;padding-top:20px;border-top:1px solid var(--line)}
.group{min-width:0}
.group h2{font-size:1rem;margin:0;line-height:1.3}
.group-head{display:flex;justify-content:space-between;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:11px}
.group-actions{display:flex;gap:6px;flex-wrap:wrap}
.chips{display:flex;flex-wrap:wrap;gap:7px;margin-bottom:14px}
.chip-wrap{display:inline-flex;align-items:stretch}
.chip{min-height:44px;min-width:48px;padding:5px 11px;border:1px solid #b8ccca;border-radius:10px;background:#fff;color:var(--ink);font-weight:750;font-size:.9rem;display:inline-flex;flex-direction:column;align-items:center;justify-content:center;line-height:1.2}
.chip small{font-size:.68rem;font-weight:600;color:var(--muted)}
.chip:hover{background:#f0f9f7}
.chip[aria-pressed="true"]{background:var(--soft);border-color:var(--teal);box-shadow:inset 0 0 0 1px var(--teal);color:var(--teal-dark)}
.chip[aria-pressed="true"] small{color:var(--teal-dark)}
.chip-wrap.has-remove .chip{border-top-right-radius:0;border-bottom-right-radius:0}
.chip-remove{min-width:34px;border:1px solid #b8ccca;border-left:0;border-radius:0 10px 10px 0;background:#fff;color:var(--muted);font-size:1.05rem;line-height:1;padding:0}
.chip-remove:hover{background:var(--danger-soft);color:var(--danger)}
.add-row{display:flex;gap:9px;align-items:flex-end;flex-wrap:wrap}
.add-row .field{flex:1 1 120px}
.field{display:flex;flex-direction:column;gap:5px;min-width:0;font-size:.81rem;font-weight:680}
.input-wrap,.select-wrap{display:flex;align-items:center;min-width:0;min-height:44px;border:1px solid #b8ccca;background:#fff;border-radius:9px;overflow:hidden;transition:border-color .15s,box-shadow .15s}
.input-wrap:focus-within,.select-wrap:focus-within{border-color:var(--teal);box-shadow:0 0 0 3px rgba(13,102,112,.13)}
.input-wrap input,.select-wrap select{min-width:0;width:100%;height:42px;border:0;background:transparent;color:var(--ink);outline:0;padding:9px 10px}
.input-wrap span{font-size:.79rem;color:var(--muted);padding-right:11px;flex:none}
.field-error{min-height:1.2em;margin:8px 0 0;font-size:.78rem;color:var(--danger)}
.field-error.is-info{color:var(--teal-dark)}
.field-help{font-size:.76rem;line-height:1.45;color:var(--muted);margin:8px 0 12px}
.mode-choice{display:grid;gap:8px;border:0;padding:0;margin:11px 0 14px;min-width:0}
.mode-choice legend{padding:0;margin-bottom:8px;font-size:.81rem;font-weight:680}
.mode-option{display:flex;gap:9px;align-items:flex-start;min-width:0;padding:10px 11px;border:1px solid var(--line);border-radius:10px;background:#fff;cursor:pointer}
.mode-option:has(input:checked){border-color:var(--teal);background:#f0f9f7;box-shadow:0 0 0 1px var(--teal)}
.mode-option input{flex:none;margin:3px 0 0;accent-color:var(--teal)}
.mode-option span{display:grid;gap:2px;min-width:0}
.mode-option b{font-size:.84rem;line-height:1.35}
.mode-option small{color:var(--muted);font-size:.72rem}
.view-grid{display:grid;gap:12px}
.check-option{display:flex;gap:10px;align-items:center;font-size:.85rem;font-weight:650;cursor:pointer;min-height:44px}
.check-option input{width:18px;height:18px;flex:none;accent-color:var(--teal)}
.form-actions{display:flex;gap:9px;flex-wrap:wrap;margin-top:8px}
.button{border-radius:9px;border:1px solid transparent;padding:10px 15px;font-size:.83rem;font-weight:750;min-height:44px}
.button-small{min-height:36px;padding:6px 11px;font-size:.76rem;border-color:#a5c6c2;background:#fff;color:var(--teal-dark)}
.button-small:hover,.button-secondary:hover{background:var(--soft)}
.button-secondary{border-color:#a5c6c2;background:#fff;color:var(--teal-dark);white-space:nowrap}
.button-quiet{background:transparent;color:var(--muted);text-align:left}
.button-quiet:hover{background:#eef3f2}

/* Подбор по требуемой площади */
.fit-panel .panel-heading{margin-bottom:16px}
.fit-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:13px;max-width:560px;margin-bottom:12px}
.fit-grid[hidden]{display:none}
.fit-summary{margin:4px 0 8px;font-size:.9rem;font-weight:700;color:var(--teal-dark);min-height:1.2em}
.fit-panel .field-help{max-width:90ch}
.base-card{margin:4px 0 14px;padding:14px 16px 4px;border:1px solid #a7ceca;border-radius:12px;background:#f4faf9;max-width:620px}
.base-card legend{padding:0 8px;font-size:.92rem;font-weight:800;color:var(--teal-dark)}
.base-card .field-help{margin:0 0 12px}
.base-card .form-actions{margin:0 0 12px}
.base-card .button:disabled{opacity:.5;cursor:not-allowed}

/* Правка значений в заголовках */
.table-tools{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 10px}
.edit-message{min-height:1.2em;margin:0 0 6px;font-size:.8rem;color:var(--danger)}
.edit-message.is-info{color:var(--teal-dark)}
.cell-input{box-sizing:content-box;min-width:2ch;max-width:7ch;padding:3px 4px;border:0;border-bottom:2px dashed #7fa7a2;border-radius:4px 4px 0 0;background:rgba(255,255,255,.55);color:var(--ink);font:inherit;font-weight:800;text-align:center}
.cell-input:hover{background:#fff}
.cell-input:focus-visible{outline:3px solid #db7c28;outline-offset:1px;background:#fff}
.cell-input[aria-invalid="true"]{border-bottom-color:var(--danger);background:var(--danger-soft)}
.step-input{display:block;margin:0 auto;font-size:1rem}
.count-line{display:block;margin-top:3px;font-size:.74rem;font-weight:700;color:var(--ink)}
.count-input{font-size:.8rem;padding:1px 3px}
.dia-line{display:inline-flex;align-items:baseline;gap:2px;font-weight:800;white-space:nowrap}
.dia-line .cell-input{font-size:.95rem}
.row-fields{font-size:.8rem;font-weight:700;white-space:nowrap}
.area-table .row-head{white-space:nowrap}
.area-table thead .col-head .dia-line{margin-top:2px}

/* Скрытие строк и столбцов прямо в таблице */
.hide-tip{margin:0 0 10px;font-size:.78rem;color:var(--muted)}
.hide-btn{display:inline-grid;place-items:center;width:24px;height:24px;padding:0;border:0;border-radius:6px;background:transparent;color:#3f5a60;opacity:.9}
.hide-btn svg,.restore svg{width:16px;height:16px;flex:none}
.hide-btn:hover,.hide-btn:focus-visible{opacity:1;background:var(--soft);color:var(--teal-dark)}
.col-head .hide-btn{display:grid;margin:0 auto 3px}
.area-table tbody th .hide-btn{margin-left:6px;vertical-align:1px}
@media(pointer:coarse){.hide-btn{width:34px;height:34px;opacity:1}.hide-btn svg{width:18px;height:18px}}
.hidden-bar{margin:0 0 10px;font-size:.8rem;color:var(--muted)}
.hidden-bar>summary{display:flex;align-items:center;gap:8px;flex-wrap:wrap;cursor:pointer;list-style:none;min-height:36px}
.hidden-bar>summary::-webkit-details-marker{display:none}
.hidden-bar>summary .summary-text{display:inline-flex;align-items:center;gap:6px;font-weight:700;color:var(--ink)}
.hidden-bar>summary .summary-text svg{width:16px;height:16px;color:var(--teal-dark)}
.hidden-bar>summary .toggle-word{color:var(--teal-dark);text-decoration:underline;text-underline-offset:3px;font-weight:700}
.hidden-bar[open]>summary .toggle-word::before{content:"свернуть"}
.hidden-bar:not([open])>summary .toggle-word::before{content:"показать список"}
.restore-list{display:flex;flex-wrap:wrap;gap:6px;margin-top:8px}
.hidden-bar .restore{display:inline-flex;align-items:center;gap:6px;min-height:36px;padding:3px 10px;border:1px dashed #9db8b4;border-radius:8px;background:#fff;color:var(--teal-dark);font-weight:700;font-size:.8rem}
.hidden-bar .restore svg{width:16px;height:16px}
.hidden-bar .restore:hover{background:var(--soft)}
.hidden-bar .restore-all{border-style:solid;font-weight:800;margin-left:auto}

/* Таблица */
.table-caption{margin:0 0 10px;font-size:.84rem;color:var(--muted)}
.scroll-hint{margin:0 0 8px;font-size:.78rem;font-weight:700;color:var(--teal-dark)}
.table-scroll{position:relative;max-width:100%;overflow-x:auto;border:1px solid var(--line);border-radius:12px;background:#fff}
.table-scroll:focus-visible{outline-offset:2px}
.area-table{border-collapse:separate;border-spacing:0;width:100%;font-variant-numeric:tabular-nums;font-size:.9rem}
.area-table th,.area-table td{padding:8px 10px;text-align:center;white-space:nowrap;border-bottom:1px solid #dfe9e7;border-right:1px solid #e6eeec}
.area-table thead th{background:#e3f0ee;color:var(--teal-dark);font-weight:800;border-bottom:1px solid #b9d3cf;border-right-color:#c7dcd8}
.area-table .title-cell{font-size:.8rem;letter-spacing:.01em}
.area-table tbody th{background:#fff;font-weight:800;color:var(--ink)}
.area-table tbody tr:nth-child(even) td,.area-table tbody tr:nth-child(even) th{background:#f6faf9}
.area-table tbody tr:last-child th,.area-table tbody tr:last-child td{border-bottom:0}
.area-table tr>*:last-child{border-right:0}
.area-table .corner,.area-table tbody th:first-child{position:sticky;left:0;z-index:2}
.area-table .corner{background:#e3f0ee;z-index:4}
.area-table .mass{color:var(--muted);border-left:2px solid #b9d3cf}
.area-table tr.mass-row td,.area-table tr.mass-row th{color:var(--muted);border-top:2px solid #b9d3cf}
.area-table td.hit{background:rgba(var(--hit-rgb),var(--fade,1))!important;font-weight:800;color:var(--ink);line-height:1.2;padding-top:5px;padding-bottom:5px}
.area-table td.hit small{display:block;font-size:.66rem;font-weight:600;color:var(--ink);opacity:.8}
.area-table td.hit.best{box-shadow:inset 0 0 0 2px #0b6b36}
.area-table .mirror{border-left:2px solid #b9d3cf}
@media(max-width:700px){.area-table .mirror{display:none}}
.table-scroll.is-scrolled .corner,.table-scroll.is-scrolled tbody th{box-shadow:6px 0 8px -6px rgba(17,54,59,.35)}
.table-scroll.can-scroll{box-shadow:inset -12px 0 10px -10px rgba(17,54,59,.28)}
.empty-state{background:#f2f7f6;color:var(--muted);padding:22px;border-radius:11px;margin:0;font-size:.9rem}
.legend{margin:10px 0 0;font-size:.8rem;color:var(--muted)}
.legend i{display:inline-block;width:70px;height:12px;border-radius:6px;vertical-align:-2px;margin-right:8px;border:1px solid var(--hit-line);background:linear-gradient(90deg,rgba(var(--hit-rgb),1),rgba(var(--hit-rgb),.15))}
.non-gost{color:var(--danger);font-weight:800;margin-left:1px}
.non-gost-note{margin:8px 0 0;font-size:.78rem;color:var(--muted)}
.non-gost-note sup{color:var(--danger);font-weight:800}
.formula-note{margin-top:16px;padding:13px 16px;background:#f2f7f6;border-left:3px solid var(--teal);border-radius:0 11px 11px 0}
.formula-note p{margin:0 0 7px;font-size:.8rem;color:var(--muted);max-width:90ch}
.formula-note p:last-child{margin-bottom:0}
.formula-note b{color:var(--ink)}
.app-footer{max-width:1280px;margin:0 auto;padding:6px 26px 34px;color:var(--muted);font-size:.78rem}
.app-footer p{margin:0 0 4px}

@media(max-width:1000px){.settings-body{grid-template-columns:1fr}}
@media(max-width:600px){
  .app-header{padding:22px 16px 18px;gap:13px}
  .brand-mark{width:52px;height:52px;border-radius:14px}
  .brand-mark img{width:46px;height:46px}
  main{padding:0 12px 24px}
  .panel{padding:17px;border-radius:15px}
  .panel-heading{flex-wrap:wrap}
  .print-button{margin-left:0}
  .area-table th,.area-table td{padding:8px 9px}
  .app-footer{padding:4px 16px 28px}
}
@media(prefers-reduced-motion:reduce){*{transition-duration:.01ms!important}html{scroll-behavior:auto}}
@media print{
  @page{size:A4 landscape;margin:12mm}
  body{background:#fff;color:#111;font-size:10pt}
  .brand-mark,.settings,.fit-panel,.print-button,.scroll-hint,.skip-link,.step-number,.hide-btn,.hide-tip,.hidden-bar{display:none}
  .app-header{padding:0 0 10px}
  main{padding:0}
  .panel{box-shadow:none;border:0;padding:0}
  .table-scroll{overflow:visible;border:1px solid #888}
  .area-table{font-size:9.5pt}
  .area-table td.hit{print-color-adjust:exact;-webkit-print-color-adjust:exact}
  .area-table .corner,.area-table tbody th:first-child{position:static}
  .app-footer{padding:12px 0 0}
  a{color:inherit;text-decoration:none}
}