@charset "UTF-8";

:root {
  color-scheme: light;
  --paper: #f5f4ef;
  --white: #fffefa;
  --ink: #282e28;
  --muted: #60665e;
  --line: #dedfd7;
  --green: #2e513f;
  --soft-green: #eaf0e6;
  --error: #a43829;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
  font-synthesis: none;
  -webkit-font-smoothing: antialiased;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 24px; }
body { margin: 0; background: var(--paper); color: var(--ink); font-size: 14px; line-height: 1.5; }
button, input { font: inherit; }
button, a, input, summary { -webkit-tap-highlight-color: transparent; }
button, summary { cursor: pointer; }
button { color: inherit; }
a { color: inherit; text-decoration: none; }
button:disabled { cursor: default; }
button, a { touch-action: manipulation; }
:focus-visible { outline: 1px solid #899d8d; outline-offset: 2px; }
[hidden] { display: none !important; }
h1, h2, p { margin: 0; }
.skip-link { position: fixed; z-index: 10; top: 12px; left: 12px; padding: 12px 20px; background: var(--green); color: white; transform: translateY(-150%); }
.skip-link:focus { transform: translateY(0); }
.site-header { border-bottom: 1px solid var(--line); }
.header-inner { max-width: 1224px; padding: 0 32px; margin: auto; min-height: 88px; display: flex; align-items: center; gap: 64px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-size: 24px; font-weight: 720; letter-spacing: -1.3px; line-height: 1; }
.brand svg { color: var(--green); }
.brand-dot { color: var(--green); margin-left: -9px; }
nav { display: flex; align-items: center; gap: 28px; }
nav a { min-height: 44px; display: inline-flex; align-items: center; gap: 8px; font-size: 13px; color: var(--muted); }
nav a:hover, .nav-current { color: var(--green); }
.header-note { margin-left: auto; color: var(--muted); font-size: 12px; }
.page { max-width: 1224px; padding: 0 32px; margin: 0 auto; }
.intro { display: flex; align-items: flex-end; justify-content: space-between; gap: 44px; padding: 48px 0 36px; }
.eyebrow { display: flex; align-items: center; gap: 9px; font-size: 10px; font-weight: 650; letter-spacing: 1.6px; color: var(--muted); }
.eyebrow-mark { width: 7px; height: 7px; background: var(--green); }
.breadcrumb-separator { color: #a8ada3; margin: 0 5px; }
h1 { margin-top: 14px; max-width: 650px; font-size: clamp(32px, 3.5vw, 49px); line-height: 1.13; font-weight: 550; letter-spacing: -2.1px; }
.title-dot { color: var(--green); }
.intro-copy { flex-shrink: 0; padding-bottom: 2px; color: var(--muted); font-size: 14px; line-height: 1.65; }
.calculator-layout { display: grid; grid-template-columns: 0.88fr 1.32fr; gap: 24px; align-items: start; }
.calculator-switch { display: flex; width: fit-content; max-width: 100%; gap: 4px; margin: 0 0 24px; padding: 4px; border: 1px solid var(--line); border-radius: 8px; }
.calculator-switch a { justify-content: center; min-height: 44px; padding: 8px 22px; border-radius: 5px; color: var(--muted); font-size: 13px; }
.calculator-switch a[aria-current="page"] { background: var(--green); color: var(--white); }
.calculator-switch a:hover:not([aria-current]) { background: var(--soft-green); color: var(--green); }
.panel { background: var(--white); border: 1px solid var(--line); border-radius: 12px; overflow: hidden; }
.form-panel { padding: 28px; }
.panel-heading { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
h2 { font-size: 18px; font-weight: 600; letter-spacing: -0.4px; line-height: 1.3; }
.text-button { background: none; border: 0; padding: 10px 0 10px 10px; font-size: 12px; color: var(--muted); }
.text-button:hover { color: var(--green); text-decoration: underline; }
.panel-description { color: var(--muted); font-size: 12px; margin-top: 2px; }
fieldset { border: 0; padding: 0; margin: 27px 0 0; min-width: 0; }
legend { padding: 0; font-size: 14px; font-weight: 600; display: flex; align-items: center; gap: 9px; }
.step-number { font-size: 10px; font-weight: 500; color: var(--green); border: 1px solid var(--line); border-radius: 50%; width: 22px; height: 22px; display: inline-flex; align-items: center; justify-content: center; }
.section-hint { color: var(--muted); font-size: 12px; margin: 10px 0 18px; }
.field-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px 16px; }
.field { min-width: 0; }
.field label { display: flex; justify-content: space-between; align-items: center; font-size: 12px; margin-bottom: 7px; }
.dimension-letter { font-family: Georgia, serif; font-style: italic; color: #8a9186; padding-right: 2px; }
.input-wrap { position: relative; }
input { border: 1px solid #d9dcd2; border-radius: 6px; background: #fffefa; width: 100%; height: 49px; color: var(--ink); padding: 10px 40px 10px 13px; font-size: 17px; font-variant-numeric: tabular-nums; transition: border-color .15s, box-shadow .15s; }
input:hover { border-color: #a0aa99; }
input:focus { outline: none; border-color: var(--green); box-shadow: 0 0 0 3px #2e513f14; }
input[aria-invalid="true"] { border-color: var(--error); }
.input-unit { position: absolute; right: 13px; top: 50%; transform: translateY(-50%); pointer-events: none; font-size: 13px; color: var(--muted); }
.field-error { color: var(--error); font-size: 11px; line-height: 1.4; display: block; margin-top: 5px; }
.field-error:empty { display: none; }
.field-footnote { color: var(--muted); font-size: 11px; margin-top: 12px; line-height: 1.5; }
.delivery-section { border-top: 1px solid var(--line); margin-top: 25px; padding-top: 20px; }
.delivery-section legend { float: left; width: 100%; margin-bottom: 17px; }
.delivery-section .field-grid { clear: both; }
.calculate-button { margin-top: 27px; display: flex; align-items: center; justify-content: space-between; gap: 12px; background: var(--green); border: 1px solid var(--green); color: #fffefa; width: 100%; min-height: 51px; padding: 12px 17px; border-radius: 6px; font-size: 14px; font-weight: 550; transition: background .15s; }
.calculate-button:hover { background: #234332; }
.calculate-button > span:last-child { font-size: 22px; font-weight: 400; }
.calculate-button:disabled { opacity: .65; }
.form-caption { text-align: center; color: var(--muted); font-size: 11px; margin-top: 12px; }
.error-banner { background: #f9eee9; border-left: 2px solid var(--error); padding: 12px; color: var(--error); margin-top: 18px; font-size: 12px; }
.output-column { display: flex; flex-direction: column; gap: 16px; min-width: 0; }
.drawing-panel { background: #eeefe6; }
.drawing-heading { display: flex; align-items: center; justify-content: space-between; padding: 20px 24px 0; }
.drawing-heading h2 { font-size: 13px; font-weight: 500; letter-spacing: 0; }
.drawing-tag { font-size: 9px; letter-spacing: 1.6px; color: var(--muted); }
#foundation-drawing { width: 100%; height: 264px; display: block; }
.drawing-footer { padding: 0 24px 16px; display: flex; justify-content: space-between; gap: 12px; font-size: 10px; color: var(--muted); }
.drawing-footer span:first-child { display: inline-flex; align-items: center; gap: 7px; }
.drawing-footer i { width: 5px; height: 5px; border-radius: 50%; background: #768b68; }
.result-panel { padding: 22px 26px 0; }
.result-panel h2 { font-size: 16px; }
.result-status { font-size: 10px; color: var(--green); }
.result-panel[data-state="stale"] .result-status, .result-panel[data-state="error"] .result-status { color: #996634; }
.result-panel[data-state="stale"] .primary-result, .result-panel[data-state="stale"] .result-details { opacity: .45; }
.result-panel[data-state="error"] .primary-result, .result-panel[data-state="loading"] .primary-result { opacity: .5; }
.primary-result { display: flex; justify-content: space-between; align-items: center; gap: 12px; padding: 20px 0 19px; }
.primary-result > div { min-width: 0; }
.result-label { font-size: 12px; color: var(--muted); margin-bottom: 3px; }
.result-value { font-size: 51px; line-height: 1.15; letter-spacing: -2.5px; font-weight: 500; font-variant-numeric: tabular-nums; overflow-wrap: anywhere; }
.result-unit { font-size: 22px; letter-spacing: -.5px; color: var(--muted); margin-left: 8px; white-space: nowrap; }
.reserve-badge { color: var(--green); background: var(--soft-green); padding: 5px 10px; font-size: 11px; border-radius: 4px; white-space: nowrap; }
.result-details { display: grid; grid-template-columns: 1fr 1fr 1fr; margin: 0; border-top: 1px solid var(--line); padding-top: 15px; }
.result-details div { padding-left: 19px; border-left: 1px solid var(--line); min-width: 0; }
.result-details div:first-child { padding-left: 0; border: none; }
.result-details dt { font-size: 11px; color: var(--muted); margin-bottom: 5px; }
.result-details dd { font-size: 19px; margin: 0; letter-spacing: -.5px; font-variant-numeric: tabular-nums; overflow-wrap: anywhere; }
.result-details dd > span:last-child { color: var(--muted); font-size: 12px; letter-spacing: 0; }
.result-note { font-size: 10px; color: var(--muted); margin: 13px 0 16px; }
.download-row { border-top: 1px solid var(--line); padding: 10px 0; display: flex; align-items: center; justify-content: space-between; gap: 12px; font-size: 11px; }
.download-buttons { display: flex; gap: 8px; }
.download-button { display: inline-flex; align-items: center; gap: 14px; justify-content: center; background: transparent; border: 1px solid var(--line); border-radius: 5px; min-height: 38px; padding: 7px 13px; font-size: 12px; }
.download-button:hover:not(:disabled) { background: var(--soft-green); border-color: #b6c4ac; }
.download-button:disabled { opacity: .4; }
.download-status { color: var(--muted); font-size: 11px; padding: 0 0 12px; }
.save-row { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 12px 0; border-top: 1px solid var(--line); font-size: 11px; }
.save-row .download-button { min-height: 44px; }
.share-box { padding-bottom: 12px; }
.share-box label, .share-box p { display: block; color: var(--muted); font-size: 11px; }
.share-field { display: flex; gap: 8px; margin: 7px 0; }
.share-field input { flex: 1; min-width: 0; height: 44px; font-size: 16px; padding: 10px; }
.share-field button { flex-shrink: 0; min-height: 44px; }
.method-section { display: grid; grid-template-columns: .88fr 1.32fr; gap: 24px; margin: 54px 0 34px; }
.method-intro h2 { font-size: 26px; letter-spacing: -.8px; margin: 12px 0; font-weight: 500; }
.method-intro > p:last-child { color: var(--muted); font-size: 13px; line-height: 1.65; }
.method-details { border-top: 1px solid var(--line); }
details { border-bottom: 1px solid var(--line); }
summary { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 18px 0; font-size: 13px; font-weight: 550; list-style: none; }
summary::-webkit-details-marker { display: none; }
summary > span { color: var(--muted); font-size: 19px; font-weight: 400; transition: transform .15s; }
details[open] summary > span { transform: rotate(45deg); }
.detail-body { color: var(--muted); font-size: 12px; padding: 0 28px 19px 0; line-height: 1.7; }
.detail-body p + p { margin-top: 10px; }
.formula { color: var(--ink); font-family: ui-monospace, "SFMono-Regular", Consolas, monospace; font-size: 12px; overflow-wrap: anywhere; }
.disclaimer { border-top: 1px solid var(--line); padding: 22px 0; display: flex; align-items: center; gap: 10px; font-size: 11px; color: var(--muted); }
.disclaimer svg { flex-shrink: 0; }
.site-footer { border-top: 1px solid var(--line); max-width: 1160px; margin: 0 auto; display: flex; justify-content: space-between; align-items: center; padding: 24px 0 32px; gap: 20px; font-size: 11px; color: var(--muted); }
.site-footer > div { display: flex; align-items: center; gap: 22px; }
.footer-brand { font-size: 16px; font-weight: 650; color: var(--ink); letter-spacing: -.7px; }
.site-footer a { min-height: 44px; display: inline-flex; align-items: center; }

@media (max-width: 1000px) {
  .header-inner { gap: 35px; }
  .header-note { display: none; }
  nav { margin-left: auto; }
  .intro { align-items: flex-start; gap: 25px; }
  .intro-copy { max-width: 220px; font-size: 12px; padding-top: 30px; }
  .desktop-break { display: none; }
  .calculator-layout { grid-template-columns: 1fr 1.1fr; gap: 18px; }
  .form-panel { padding: 22px; }
  .panel-heading h2 { font-size: 16px; }
  .result-panel { padding: 22px 20px 0; }
  .result-details div { padding-left: 12px; }
  .result-details dt { font-size: 10px; }
  .result-value { font-size: 45px; }
  .site-footer { margin: 0 32px; }
}

@media (max-width: 760px) {
  .header-inner { min-height: 72px; padding: 0 20px; gap: 16px; }
  .brand { font-size: 22px; }
  nav { gap: 16px; }
  nav a { font-size: 12px; }
  nav .nav-current { display: none; }
  .page { padding: 0 20px; max-width: 600px; }
  .intro { display: block; padding: 32px 0 26px; }
  h1 { max-width: 450px; font-size: 38px; letter-spacing: -1.5px; margin-top: 14px; }
  .intro-copy { max-width: 360px; padding: 14px 0 0; font-size: 13px; }
  .intro-copy br { display: none; }
  .eyebrow { font-size: 9px; letter-spacing: 1.3px; }
  .calculator-layout { display: flex; flex-direction: column; gap: 18px; }
  .calculator-layout > * { width: 100%; }
  .form-panel { padding: 22px; }
  .panel-heading h2 { font-size: 17px; }
  .form-panel fieldset { margin-top: 23px; }
  .field-grid { gap: 18px 16px; }
  input { height: 51px; }
  .calculate-button { min-height: 54px; margin-top: 22px; }
  .text-button { min-height: 44px; }
  #foundation-drawing { height: 240px; }
  .output-column { gap: 18px; }
  .result-panel { padding: 22px 22px 0; scroll-margin-top: 16px; }
  .result-value { font-size: 49px; }
  .result-details dt { font-size: 11px; }
  .download-button { min-height: 44px; }
  .method-section { display: block; margin: 38px 0 28px; }
  .method-intro { margin-bottom: 22px; }
  .method-intro > p:last-child br { display: none; }
  .method-intro h2 { font-size: 25px; }
  .detail-body { padding-right: 10px; }
  .disclaimer { align-items: flex-start; font-size: 11px; }
  .site-footer { margin: 0 20px; padding: 18px 0; }
  .site-footer > div { display: block; }
  .site-footer > div > span { display: block; }
  .footer-brand { margin-bottom: 3px; }
}

@media (max-width: 380px) {
  .calculator-switch a { padding-left: 14px; padding-right: 14px; }
  .page, .header-inner { padding-left: 16px; padding-right: 16px; }
  h1 { font-size: 35px; }
  .form-panel, .result-panel { padding-left: 18px; padding-right: 18px; }
  .panel-heading h2 { font-size: 15px; }
  .field-grid { column-gap: 12px; }
  .field label { font-size: 11px; }
  .result-status { font-size: 9px; }
  .result-details dt { font-size: 10px; }
  .result-details dd { font-size: 18px; }
  .drawing-heading { padding-left: 18px; padding-right: 18px; }
  .drawing-footer { padding-left: 18px; padding-right: 18px; font-size: 9px; gap: 7px; }
  .result-value { font-size: 43px; }
  .reserve-badge { font-size: 10px; padding: 5px 7px; }
  .download-row { font-size: 10px; gap: 6px; }
  .download-button { padding: 7px 10px; gap: 10px; }
  .site-footer { margin-left: 16px; margin-right: 16px; }
}

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

/* Подсветка клавиатуры совпадает с рамкой элементов управления. */
:is(button,input,select,textarea):focus-visible { outline: 1px solid #899d8d; outline-offset: -1px; border-color: #899d8d; box-shadow: none; }