: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;--warn:#8a5716;--warn-soft:#fff6e8;--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}
button:disabled{cursor:not-allowed;opacity:.52}
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}
.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,h2,h3,p{margin-top:0}
h1{font-size:clamp(1.65rem,3vw,2.6rem);line-height:1.12;letter-spacing:-.035em;margin-bottom:8px}
.header-subtitle{color:var(--muted);margin-bottom:0}
main{max-width:1280px;margin:0 auto;padding:0 26px 30px}
.workspace{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));grid-template-areas:"context input" "drawings input";gap:18px;align-items:start}
.context-panel{grid-area:context}
.input-panel{grid-area:input}
.drawings-panel{grid-area:drawings}
.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:19px;min-width:0}
.panel-heading h2{font-size:1.38rem;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}
.context-panel>p{color:#344f55;font-size:.97rem;max-width:62ch}
.normative-figure{margin:18px 0 0;padding:10px;border:1px solid var(--line);border-radius:14px;background:#fff}
.normative-figure>a{display:block;background:#fff;border:1px solid #e8eeed;border-radius:9px;overflow:hidden}
.normative-figure img{display:block;width:100%;height:auto;max-height:390px;object-fit:contain}
.normative-figure figcaption{display:grid;gap:7px;padding:12px 3px 2px;color:var(--muted);font-size:.8rem;line-height:1.45}
.normative-figure figcaption strong{color:var(--ink)}
.normative-figure figcaption a{font-weight:750}
.drawing-status{margin:-3px 0 3px;color:var(--muted);font-size:.82rem}
.drawing-card{border:1px solid var(--line);border-radius:14px;overflow:hidden;background:#f9fcfb;margin-top:20px}
.drawing-card+.drawing-card{margin-top:17px}
.drawing-title{padding:12px 15px;display:flex;justify-content:space-between;gap:10px;border-bottom:1px solid var(--line);font-size:.86rem;font-weight:750}
.drawing-tag{color:var(--muted);font-weight:500}
.drawing-viewport{overflow-x:auto;max-width:100%}
.drawing-card svg{width:100%;height:auto;display:block;max-height:335px}
.drawing-legend{display:flex;flex-wrap:wrap;gap:17px;padding:0 15px 9px;font-size:.78rem;color:var(--muted)}
.drawing-legend span{display:inline-flex;align-items:center;gap:7px}
.drawing-legend i{display:block;width:17px;height:10px}
.legend-solid{background:var(--ink)}
.legend-dashed{border:2px dashed var(--teal)}
.legend-outer{border:2px dashed #ad5b20}
.legend-x{background:var(--teal);height:5px!important}
.legend-y{background:#ad5b20;border:2px solid #fff;border-radius:50%;width:12px!important;height:12px!important;box-shadow:0 0 0 1px #ad5b20}
.drawing-note{font-size:.79rem;color:var(--muted);padding:0 15px 14px;margin:0}
.section-values{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:6px 12px;margin:0;padding:5px 15px 14px}
.section-values>div{min-width:0;border-top:1px solid var(--line);padding-top:7px}
.section-values dt{font-size:.72rem;color:var(--muted)}
.section-values dd{margin:0;font-weight:750;font-size:.83rem;overflow-wrap:anywhere}
.scope-note{background:#f2f7f6;border-left:3px solid var(--teal);padding:15px 17px;margin-top:19px;border-radius:0 11px 11px 0}
.scope-note h3{font-size:.9rem;margin-bottom:5px}
.scope-note p{font-size:.82rem;color:var(--muted);margin-bottom:8px}
.scope-note a{font-size:.8rem;font-weight:700}
form{min-width:0}
fieldset{border:0;padding:0;margin:0 0 19px;min-width:0}
fieldset+fieldset{border-top:1px solid var(--line);padding-top:18px}
legend{padding:0;margin-bottom:12px;font-size:.92rem;font-weight:800;color:var(--ink)}
.mode-choice{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:9px}
.mode-option{display:flex;gap:9px;align-items:flex-start;min-width:0;padding: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:has(input:disabled){opacity:.55;cursor:not-allowed}
.mode-option input{flex:none;margin:3px 0 0;accent-color:var(--teal)}
.mode-option span{min-width:0;display:grid;gap:3px}
.mode-option b{font-size:.81rem;line-height:1.35}
.mode-option small{color:var(--muted);font-size:.7rem;line-height:1.4}
#mode-notice{padding:9px 11px;background:var(--warn-soft);border-radius:8px;color:var(--warn)}
.rebar-intro{margin:0 0 12px}
.outer-reaction-grid{margin-top:12px}
.rebar-confirmations{display:grid;gap:8px;margin:13px 0 17px}
.rebar-confirmations .confirmation{background:#f7faf9;border-color:var(--line)}
#outer-contour-preview{background:#f2f7f6;padding:10px;border-radius:8px;margin:12px 0 0}
.field-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:13px}
.shape-field{margin-bottom:13px}
#rectangular-fields,#circular-fields{margin-bottom:13px}
.field{display:flex;flex-direction:column;gap:5px;min-width:0;font-size:.81rem;font-weight:680}
.field-wide{grid-column:1/-1}
.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}
.select-wrap select{appearance:auto}
.field-help{font-size:.76rem;line-height:1.45;color:var(--muted);margin:8px 0 0}
.confirmation{display:flex;gap:11px;padding:13px;border-radius:11px;background:var(--warn-soft);border:1px solid #ead4b8;font-size:.81rem;line-height:1.45;cursor:pointer}
.confirmation input{width:18px;height:18px;flex:none;margin:2px 0 0;accent-color:var(--teal)}
.form-actions{display:flex;gap:9px;flex-wrap:wrap;margin-top:17px}
.button{border-radius:9px;border:1px solid transparent;padding:10px 15px;font-size:.83rem;font-weight:750;min-height:42px;white-space:nowrap}
.button-primary{background:var(--teal);color:#fff}
.button-primary:hover{background:var(--teal-dark)}
.button-secondary{border-color:#a5c6c2;background:#fff;color:var(--teal-dark)}
.button-secondary:hover{background:var(--soft)}
.button-quiet{background:transparent;color:var(--muted)}
.button-quiet:hover{background:#eef3f2}
.result-panel{margin-top:18px}
.result-heading{margin-bottom:14px}
.print-button{margin-left:auto}
.empty-state{background:#f2f7f6;color:var(--muted);padding:22px;border-radius:11px;margin:0;font-size:.9rem}
.result-content{min-width:0}
.verdict{display:flex;justify-content:space-between;gap:20px;align-items:center;border-radius:13px;padding:17px 20px;margin-bottom:18px}
.verdict.pass{background:#e9f6ed;border:1px solid #acd5b8;color:#20573b}
.verdict.fail{background:var(--danger-soft);border:1px solid #edb7b2;color:#842c27}
.verdict.not-applicable{background:var(--warn-soft);border:1px solid #ead4b8;color:#754b16}
.verdict .status{font-weight:800;font-size:1.07rem;line-height:1.25}
.verdict .status-detail{font-size:.8rem;margin:4px 0 0;max-width:70ch}
.verdict .ratio{font-size:1.45rem;font-weight:800;white-space:nowrap}
.metric-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;margin-bottom:16px}
.metric{min-width:0;border:1px solid var(--line);border-radius:10px;padding:13px;background:#fcfefd}
.metric dt{font-size:.75rem;color:var(--muted);margin-bottom:5px}
.metric dd{font-weight:800;margin:0;font-size:1.15rem;white-space:nowrap}
.result-warning{font-size:.81rem;color:var(--muted);margin:0 0 14px}
.rebar-not-required{padding:12px 14px;background:#f2f7f6;border-left:3px solid var(--teal);border-radius:0 8px 8px 0;font-size:.84rem}
.checks-heading{font-size:.97rem;margin:20px 0 9px}
.rebar-checks{list-style:none;padding:0;margin:0 0 16px;border:1px solid var(--line);border-radius:11px;overflow:hidden}
.rebar-check{display:grid;grid-template-columns:minmax(0,1.2fr) minmax(0,1fr) auto;gap:12px;align-items:center;padding:10px 13px;border-top:1px solid var(--line);font-size:.8rem}
.rebar-check:first-child{border-top:0}
.rebar-check>span:first-child{display:grid;gap:2px;min-width:0}
.rebar-check small{color:var(--muted);font-size:.7rem}
.rebar-check>span:nth-child(2){min-width:0;overflow-wrap:anywhere}
.check-pill{font-size:.71rem;padding:4px 8px;border-radius:6px;white-space:nowrap}
.check-pill.ok{background:#e9f6ed;color:#20573b}
.check-pill.bad{background:var(--danger-soft);color:#842c27}
.protocol{border:1px solid var(--line);border-radius:11px;overflow:hidden}
.protocol>summary{cursor:pointer;padding:12px 15px;font-weight:750;background:#f7faf9}
.protocol>summary:hover{background:var(--soft)}
.protocol-body{padding:17px 18px}
.protocol-body h3{font-size:.94rem;margin:20px 0 9px}
.protocol-body h3:first-child{margin-top:0}
.source-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px 15px;margin:0}
.source-list div{min-width:0;border-bottom:1px solid #e8eeed;padding-bottom:6px}
.source-list dt{font-size:.75rem;color:var(--muted)}
.source-list dd{margin:0;font-size:.86rem;font-weight:700;overflow-wrap:anywhere}
.equation-row{border-left:3px solid #b6d8d4;padding:5px 0 6px 12px;margin:12px 0;min-width:0}
.equation{display:block;font-family:Georgia,"Times New Roman",serif;font-style:italic;font-size:1.03rem;white-space:nowrap;overflow-x:auto;max-width:100%;line-height:1.5}
.substitution{display:block;color:var(--muted);font-size:.81rem;margin-top:3px;overflow-wrap:anywhere}
.frac{display:inline-flex;vertical-align:middle;flex-direction:column;text-align:center;line-height:1.18;white-space:nowrap}
.frac>span:first-child{border-bottom:1px solid currentColor;padding:0 3px 1px}
.frac>span:last-child{padding:1px 3px 0}
.protocol-foot{font-size:.77rem;color:var(--muted);margin:16px 0 0}
.app-footer{max-width:1280px;margin:auto;padding:4px 26px 36px;color:var(--muted);font-size:.77rem}
.app-footer p{margin-bottom:4px}
@media(max-width:850px){.workspace{grid-template-columns:1fr;grid-template-areas:"context" "input" "drawings"}.metric-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:600px){.app-header{padding:22px 15px 19px;gap:11px}.brand-mark{width:48px;height:48px;border-radius:12px}.brand-mark img{width:43px;height:43px}.eyebrow{font-size:.67rem}h1{font-size:1.55rem}.header-subtitle{font-size:.8rem}main{padding:0 12px 22px}.panel{padding:17px;border-radius:14px}.panel-heading{gap:9px;margin-bottom:15px}.panel-heading h2{font-size:1.18rem}.step-number{width:31px;height:31px;border-radius:8px}.mode-choice{grid-template-columns:1fr}.field-grid{gap:10px}.field-wide-mobile{grid-column:1/-1}.field{font-size:.76rem}.input-wrap input,.select-wrap select{font-size:.84rem}.form-actions .button{flex:1 1 auto}.drawing-viewport svg{min-width:530px;max-height:none}.drawing-viewport:after{content:"Прокрутите схему вправо →";display:block;padding:0 15px 8px;color:var(--muted);font-size:.72rem}.drawing-title{font-size:.8rem;flex-wrap:wrap}.normative-figure{padding:5px}.normative-figure img{max-height:340px}.result-heading{flex-wrap:wrap}.print-button{margin-left:40px}.verdict{align-items:flex-start;flex-direction:column;gap:5px;padding:14px}.verdict .ratio{font-size:1.3rem}.metric{padding:10px}.metric dd{font-size:1.02rem}.source-list{grid-template-columns:1fr}.protocol-body{padding:13px}.app-footer{padding:2px 15px 25px}}
@media(max-width:350px){.field-grid{grid-template-columns:1fr}.field-wide{grid-column:auto}.metric-grid{grid-template-columns:1fr}}
@media(max-width:600px){.rebar-check{grid-template-columns:minmax(0,1fr) auto;gap:4px 8px}.rebar-check>span:nth-child(2){grid-column:1;grid-row:2}.rebar-check>.check-pill{grid-column:2;grid-row:1/3}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}
@media print{@page{size:A4;margin:15mm}body{background:#fff;color:#111;font-size:10pt}.app-header{padding:0 0 12px}.brand-mark{display:none}main{padding:0}.workspace{display:block}.context-panel,.input-panel{display:none}.drawings-panel{break-inside:auto;margin-bottom:16px}.drawing-card{display:inline-block;vertical-align:top;width:49%;margin-top:5px;break-inside:avoid}.drawing-card+.drawing-card{margin-top:5px}.drawing-viewport{overflow:visible}.drawing-card svg{min-width:0;width:100%;max-height:none}.drawing-viewport:after{display:none}.drawing-note{font-size:7.5pt}.section-values{grid-template-columns:1fr 1fr;gap:2px 8px}.section-values dt,.section-values dd{font-size:7.5pt}.panel{box-shadow:none;border:0;padding:0}.result-panel{margin:0}.print-button{display:none}.result-heading{margin-bottom:10px}.result-content{display:block}.protocol{break-inside:avoid}.protocol>summary{display:none}.protocol-body{display:block;padding:0;border:0}.verdict,.metric{print-color-adjust:exact;-webkit-print-color-adjust:exact}.app-footer{padding:15px 0 0}a{color:inherit;text-decoration:none}}