/* beam.css — калькулятор прогину (/tools/beam). Мова сайту: аркуш креслення, моно-підписи, червоний креслярський акцент. */

.crumbs { font: 500 11px/1.4 var(--f-mono); letter-spacing: 0.14em; text-transform: uppercase; color: var(--pencil); margin-bottom: 28px; }
.crumbs a { color: inherit; text-decoration: none; border-bottom: 1px solid currentColor; }
.crumbs a:hover { color: var(--drafting); }
.crumbs [aria-current] { color: var(--ink); }

.bm-sheet { padding-top: clamp(56px, 8vh, 96px); }
.bm {
    display: grid;
    grid-template-columns: minmax(300px, 380px) minmax(0, 1fr);
    gap: clamp(20px, 2.4vw, 36px);
    align-items: start;
}

/* ── Панель вихідних даних ─────────────────────────────────────────── */
.bm-panel {
    border: 1px solid rgba(245, 242, 232, 0.16);
    background: var(--dark-bg-alt);
    padding: 0 20px 20px;
    position: sticky;
    top: 88px;
}
.bm-panel__head {
    display: flex; justify-content: space-between; align-items: center;
    margin: 0 -20px 6px; padding: 14px 20px;
    border-bottom: 1px solid rgba(245, 242, 232, 0.16);
    font: 600 11px/1 var(--f-mono); letter-spacing: 0.2em; text-transform: uppercase;
}
.bm-panel__head i { font-style: normal; color: var(--drafting-bright); letter-spacing: 0.14em; }
.bm-field { border: 0; padding: 22px 0 0; min-width: 0; }
.bm-field + .bm-field { margin-top: 2px; }
.bm-field legend, .bm-field > label, .bm-select > span, .bm-gf > span {
    display: block; padding: 0; margin-bottom: 10px;
    font: 500 10.5px/1.3 var(--f-mono); letter-spacing: 0.16em; text-transform: uppercase; color: var(--dark-muted);
}

.bm-segs { display: grid; grid-template-columns: repeat(2, 1fr); gap: 6px; }
.bm-seg, .bm-kind, .bm-chip {
    appearance: none; cursor: pointer; color: var(--dark-ink);
    background: transparent; border: 1px solid rgba(245, 242, 232, 0.16);
    transition: border-color .25s var(--ease), background-color .25s var(--ease), color .25s var(--ease), transform .2s var(--ease);
}
.bm-seg { display: grid; justify-items: center; gap: 4px; padding: 10px 6px 8px; font: 500 10.5px/1.2 var(--f-mono); letter-spacing: 0.06em; }
.bm-seg svg { width: 100%; max-width: 92px; height: 30px; fill: none; stroke: currentColor; stroke-width: 1.5; stroke-linecap: round; stroke-linejoin: round; }
.bm-kinds { display: grid; grid-template-columns: repeat(4, 1fr); gap: 6px; }
.bm-kind { display: grid; justify-items: center; gap: 6px; padding: 10px 4px 8px; font: 500 9.5px/1.2 var(--f-mono); letter-spacing: 0.04em; text-align: center; }
.bm-kind svg { width: 28px; height: 28px; fill: none; stroke: currentColor; stroke-width: 1.4; }
.bm-chips { display: grid; grid-template-columns: repeat(4, 1fr); gap: 6px; }
.bm-chip { display: grid; gap: 3px; padding: 9px 4px 8px; font: 600 11px/1.1 var(--f-mono); letter-spacing: 0.04em; text-align: center; }
.bm-chip small { font-weight: 400; font-size: 9px; color: var(--dark-muted); letter-spacing: 0.08em; }
.bm-seg:hover, .bm-kind:hover, .bm-chip:hover { border-color: rgba(245, 242, 232, 0.5); }
.bm-seg:active, .bm-kind:active, .bm-chip:active { transform: scale(0.97); }
.bm-seg[aria-pressed="true"], .bm-kind[aria-pressed="true"], .bm-chip[aria-pressed="true"] {
    border-color: var(--drafting-bright); background: rgba(229, 68, 56, 0.12); color: var(--paper);
}
.bm-chip[aria-pressed="true"] small { color: rgba(245, 242, 232, 0.8); }
.bm-seg:focus-visible, .bm-kind:focus-visible, .bm-chip:focus-visible, .bm-unit:focus-visible, .bm-share:focus-visible {
    outline: 1px solid var(--drafting-bright); outline-offset: 2px;
}

.bm-row { display: flex; gap: 12px; align-items: end; margin-top: 10px; flex-wrap: wrap; }
.bm-select { flex: 1 1 140px; }
.bm-select > span { margin-bottom: 6px; }
.bm-select select, .bm-num input, .bm-gf input {
    width: 100%; height: 40px; padding: 0 12px;
    background: var(--dark-bg); color: var(--dark-ink);
    border: 1px solid rgba(245, 242, 232, 0.2); border-radius: 0;
    font: 500 14px/1 var(--f-mono); letter-spacing: 0.02em;
    -moz-appearance: textfield;
}
.bm-select select { appearance: none; background-image: linear-gradient(45deg, transparent 50%, var(--dark-muted) 50%), linear-gradient(-45deg, transparent 50%, var(--dark-muted) 50%);
    background-position: calc(100% - 17px) 17px, calc(100% - 12px) 17px; background-size: 5px 5px; background-repeat: no-repeat; padding-right: 30px; }
.bm-num input::-webkit-inner-spin-button, .bm-num input::-webkit-outer-spin-button, .bm-gf input::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
.bm-select select:focus, .bm-num input:focus, .bm-gf input:focus { outline: none; border-color: var(--drafting-bright); }

.bm-toggle { display: inline-flex; align-items: center; gap: 10px; cursor: pointer; font: 500 11px/1.3 var(--f-mono); letter-spacing: 0.06em; color: var(--dark-ink); padding: 8px 0; }
.bm-toggle[hidden] { display: none; }
.bm-toggle input { position: absolute; opacity: 0; pointer-events: none; }
.bm-toggle i { position: relative; width: 32px; height: 18px; border: 1px solid rgba(245, 242, 232, 0.4); flex: none; transition: border-color .25s var(--ease), background-color .25s var(--ease); }
.bm-toggle i::after { content: ""; position: absolute; top: 3px; left: 3px; width: 10px; height: 10px; background: var(--dark-muted); transition: transform .3s var(--ease), background-color .25s var(--ease); }
.bm-toggle input:checked + i { border-color: var(--drafting-bright); background: rgba(229, 68, 56, 0.14); }
.bm-toggle input:checked + i::after { transform: translateX(14px); background: var(--drafting-bright); }
.bm-toggle input:focus-visible + i { outline: 1px solid var(--drafting-bright); outline-offset: 2px; }

/* слайдер + число */
.bm-slider { display: grid; grid-template-columns: 1fr 132px; column-gap: 12px; align-items: center; }
.bm-slider > label { margin: 0; }
.bm-num { position: relative; display: flex; }
.bm-num input { padding-right: 52px; text-align: right; }
.bm-num em, .bm-unit {
    position: absolute; right: 1px; top: 1px; bottom: 1px; min-width: 44px; display: grid; place-items: center;
    font: 500 10.5px/1 var(--f-mono); font-style: normal; color: var(--dark-muted); background: transparent; border: 0; border-left: 1px solid rgba(245, 242, 232, 0.12);
}
.bm-unit { cursor: pointer; color: var(--drafting-bright); text-decoration: underline dotted; text-underline-offset: 3px; }
.bm-unit:hover { color: var(--paper); }
.bm-slider input[type="range"] { grid-column: 1 / -1; margin-top: 10px; }
.bm-slider.is-muted { opacity: 0.38; }

.bm input[type="range"] { -webkit-appearance: none; appearance: none; width: 100%; height: 22px; background: transparent; cursor: pointer; }
.bm input[type="range"]::-webkit-slider-runnable-track { height: 1px; background: linear-gradient(90deg, rgba(245,242,232,.5) 0 100%); }
.bm input[type="range"]::-moz-range-track { height: 1px; background: rgba(245,242,232,.5); }
.bm input[type="range"]::-webkit-slider-thumb { -webkit-appearance: none; width: 14px; height: 14px; margin-top: -7px; background: var(--dark-bg); border: 1.5px solid var(--drafting-bright); transform: rotate(45deg); transition: transform .2s var(--ease); }
.bm input[type="range"]::-moz-range-thumb { width: 12px; height: 12px; background: var(--dark-bg); border: 1.5px solid var(--drafting-bright); border-radius: 0; transform: rotate(45deg); }
.bm input[type="range"]:active::-webkit-slider-thumb { transform: rotate(45deg) scale(1.25); background: var(--drafting-bright); }
.bm input[type="range"]:focus-visible { outline: 1px solid var(--drafting-bright); outline-offset: 4px; }

.bm-chips--4 { grid-template-columns: repeat(4, 1fr); }
.bm-row--foot { justify-content: space-between; margin-top: 14px; padding-top: 12px; border-top: 1px dashed rgba(245, 242, 232, 0.14); }
.bm-gf { display: grid; grid-template-columns: 1fr 70px; align-items: center; gap: 10px; flex: 1 1 100%; }
.bm-gf > span { margin: 0; }
.bm-gf input { height: 34px; text-align: right; }

/* ── Креслення ─────────────────────────────────────────────────────── */
.bm-out { display: grid; gap: clamp(14px, 1.6vw, 20px); min-width: 0; }
.bm-draw {
    position: relative; margin: 0;
    border: 1px solid rgba(245, 242, 232, 0.16);
    background: radial-gradient(120% 90% at 40% 30%, #17171a 0%, var(--dark-bg) 70%);
    padding: 44px 14px 8px;
}
.bm-draw__tag {
    position: absolute; left: 18px; right: 18px; top: 14px; display: flex; justify-content: space-between; gap: 16px;
    font: 500 10.5px/1.3 var(--f-mono); letter-spacing: 0.16em; text-transform: uppercase; color: var(--dark-muted);
}
.bm-draw__tag b { color: var(--dark-ink); font-weight: 600; }
.bm-draw__tag span { text-align: right; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.bm-crop { position: absolute; width: 14px; height: 14px; border: 0 solid rgba(245, 242, 232, 0.5); }
.bm-crop--tl { top: -1px; left: -1px; border-top-width: 1px; border-left-width: 1px; }
.bm-crop--tr { top: -1px; right: -1px; border-top-width: 1px; border-right-width: 1px; }
.bm-crop--bl { bottom: -1px; left: -1px; border-bottom-width: 1px; border-left-width: 1px; }
.bm-crop--br { bottom: -1px; right: -1px; border-bottom-width: 1px; border-right-width: 1px; }
.bm-svg { display: block; width: 100%; height: auto; aspect-ratio: 1000 / 560; overflow: visible; }

.bm-grid path { stroke: rgba(245, 242, 232, 0.045); stroke-width: 1; }
.bm-beam { stroke: rgba(245, 242, 232, 0.28); stroke-width: 6; stroke-linecap: butt; }
.bm-defl { fill: none; stroke: var(--drafting-bright); stroke-width: 2.4; stroke-dasharray: 10 5; filter: drop-shadow(0 0 6px rgba(229, 68, 56, 0.45)); }
.bm-defl-fill { fill: rgba(229, 68, 56, 0.07); }
.bm-sup, .bm-hinge { fill: var(--dark-bg); stroke: var(--dark-ink); stroke-width: 1.6; }
.bm-hatch { stroke: rgba(245, 242, 232, 0.55); stroke-width: 1.2; }
.bm-hatch--m { stroke: rgba(229, 68, 56, 0.55); stroke-width: 1; }
.bm-q { stroke: rgba(245, 242, 232, 0.75); stroke-width: 1.2; }
.bm-q-line { stroke: rgba(245, 242, 232, 0.75); stroke-width: 1.2; }
.bm-arrhead { fill: rgba(245, 242, 232, 0.85); }
.bm-arrhead--p { fill: var(--drafting-bright); }
.bm-p { stroke: var(--drafting-bright); stroke-width: 2.6; }
.bm-dim { stroke: rgba(245, 242, 232, 0.55); stroke-width: 1; fill: none; }
.bm-dim--soft { stroke: rgba(245, 242, 232, 0.3); }
.bm-tick { stroke: rgba(245, 242, 232, 0.8); stroke-width: 1.4; }
.bm-label, .bm-dimtxt, .bm-note, .bm-sectxt, .bm-axislbl, .bm-flbl, .bm-mlbl { font-family: var(--f-mono); fill: var(--dark-ink); }
.bm-label { font-size: 13px; letter-spacing: 0.1em; fill: var(--dark-muted); }
.bm-label--q { fill: var(--dark-ink); letter-spacing: 0.04em; font-size: 14px; }
.bm-label--p { fill: var(--drafting-bright); font-size: 14px; font-weight: 600; }
.bm-dimtxt { font-size: 13px; letter-spacing: 0.04em; }
.bm-dimtxt--soft { fill: var(--dark-muted); }
.bm-note { font-size: 12px; fill: var(--dark-muted); letter-spacing: 0.12em; text-transform: uppercase; }
.bm-fdot { fill: var(--drafting-bright); }
.bm-leader { fill: none; stroke: var(--drafting-bright); stroke-width: 1; }
.bm-flbl { font-size: 17px; font-weight: 600; fill: var(--paper); }
.bm-axis { stroke: rgba(245, 242, 232, 0.4); stroke-width: 1; }
.bm-m { fill: none; stroke: var(--drafting-bright); stroke-width: 1.8; }
.bm-m-fill { fill: url(#bmHatchM); stroke: none; }
.bm-mdot { fill: var(--drafting-bright); }
.bm-mlbl { font-size: 14px; font-weight: 600; }
.bm-sec path, .bm-sec circle { fill: rgba(245, 242, 232, 0.12); stroke: var(--dark-ink); stroke-width: 1.4; }
.bm-axisline { stroke: var(--drafting-bright); stroke-width: 1; stroke-dasharray: 14 4 2 4; }
.bm-axislbl { font-size: 12px; fill: var(--drafting-bright); }
.bm-sectxt { font-size: 14px; font-weight: 600; }
.bm-sectxt--soft { font-size: 12px; font-weight: 400; fill: var(--dark-muted); }
.bm-reac { stroke: var(--green); }

/* ── Штамп результатів ─────────────────────────────────────────────── */
.bm-stamp {
    display: grid; grid-template-columns: 170px 1fr 1fr; gap: 0;
    border: 1px solid rgba(245, 242, 232, 0.16);
}
.bm-stamp > * { padding: 16px 18px; border-right: 1px solid rgba(245, 242, 232, 0.12); }
.bm-stamp > *:last-child { border-right: 0; }
.bm-verdict { display: grid; place-items: center; }
.bm-verdict span {
    display: inline-block; padding: 10px 12px 9px; border: 2px solid currentColor; transform: rotate(-6deg);
    font: 700 13px/1.1 var(--f-mono); letter-spacing: 0.14em; text-align: center; color: var(--dark-muted);
    transition: color .3s var(--ease), transform .45s var(--ease);
}
.bm-verdict.is-ok span { color: #8fcf7a; }
.bm-verdict.is-fail span { color: var(--drafting-bright); transform: rotate(-6deg) scale(1.04); }
.bm-meter__head { display: flex; justify-content: space-between; align-items: baseline; gap: 10px; font: 500 10.5px/1.2 var(--f-mono); letter-spacing: 0.14em; text-transform: uppercase; color: var(--dark-muted); }
.bm-meter__head b { font: 400 clamp(26px, 2.6vw, 34px)/1 var(--f-display); letter-spacing: 0; text-transform: none; color: var(--paper); white-space: nowrap; }
.bm-meter__bar { position: relative; height: 6px; margin: 14px 0 10px; background: rgba(245, 242, 232, 0.08); overflow: hidden; }
.bm-meter__bar i { position: absolute; inset: 0; transform-origin: left; transform: scaleX(0); background: #8fcf7a; transition: transform .6s var(--ease), background-color .3s var(--ease); }
.bm-meter__lim { position: absolute; top: -3px; bottom: -3px; left: 66.667%; width: 1px; background: var(--paper); }
.bm-meter.is-over .bm-meter__bar i { background: var(--drafting-bright); }
.bm-meter.is-over .bm-meter__head b { color: var(--drafting-bright); }
.bm-meter__foot { display: flex; justify-content: space-between; gap: 8px; font: 400 11px/1.3 var(--f-mono); color: var(--dark-muted); }
.bm-meter__foot > span:last-child { color: var(--dark-ink); font-weight: 600; }
.bm-facts {
    grid-column: 1 / -1; display: grid; grid-template-columns: repeat(4, 1fr); gap: 0;
    padding: 0 !important; border-top: 1px solid rgba(245, 242, 232, 0.12); border-right: 0 !important;
}
.bm-facts > div { padding: 12px 18px; border-right: 1px solid rgba(245, 242, 232, 0.12); }
.bm-facts > div:last-child { border-right: 0; }
.bm-facts dt { font: 500 9.5px/1.3 var(--f-mono); letter-spacing: 0.14em; text-transform: uppercase; color: var(--dark-muted); margin-bottom: 6px; }
.bm-facts dd { font: 500 12.5px/1.4 var(--f-mono); color: var(--dark-ink); }

/* ── Підбір, дії ───────────────────────────────────────────────────── */
.bm-pick {
    display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap;
    padding: 14px 18px; border: 1px dashed rgba(229, 68, 56, 0.55); background: rgba(229, 68, 56, 0.06);
    transition: opacity .3s var(--ease), border-color .3s var(--ease);
}
.bm-pick.is-idle { border-color: rgba(245, 242, 232, 0.16); background: transparent; }
.bm-pick__txt { display: grid; gap: 4px; }
.bm-pick__txt span { font: 500 10.5px/1.3 var(--f-mono); letter-spacing: 0.14em; text-transform: uppercase; color: var(--dark-muted); }
.bm-pick__txt b { font: 400 24px/1.1 var(--f-display); color: var(--paper); }
.bm-pick__txt em { font: 400 12px/1.4 var(--f-mono); font-style: normal; color: var(--drafting-bright); }
.bm-pick.is-idle .bm-pick__txt em { color: var(--dark-muted); }
.bm-pick__btn { color: var(--dark-ink); border-color: rgba(245, 242, 232, 0.4); }
.bm-pick__btn:disabled { opacity: 0.35; pointer-events: none; }
.bm-actions { display: flex; align-items: center; gap: 22px; flex-wrap: wrap; }
.bm-actions .btn--primary { background: var(--dark-ink); color: var(--ink); border-color: var(--dark-ink); }
.bm-actions .btn--primary:hover { color: var(--paper); }
.bm-share { background: none; border: 0; padding: 6px 0; cursor: pointer; color: var(--dark-muted); font: 500 11px/1.3 var(--f-mono); letter-spacing: 0.1em; text-transform: uppercase; border-bottom: 1px solid currentColor; }
.bm-share:hover { color: var(--paper); }

.bm-scope { margin-top: clamp(24px, 3vw, 36px); max-width: 110ch; font: 400 13px/1.7 var(--f-body); color: var(--dark-muted); }
.bm-scope b { color: var(--dark-ink); font-weight: 600; }

/* ── Метод ─────────────────────────────────────────────────────────── */
.bm-steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0; border-top: 1px solid var(--ink); }
.bm-step { padding: 28px 28px 32px 0; border-right: 1px solid rgba(14, 14, 12, 0.12); }
.bm-step + .bm-step { padding-left: 28px; }
.bm-step:last-child { border-right: 0; }
.bm-step__n { font: 500 11px/1 var(--f-mono); letter-spacing: 0.2em; color: var(--drafting); }
.bm-step h3 { font: 400 clamp(24px, 2.2vw, 30px)/1.15 var(--f-display); margin: 16px 0 12px; }
.bm-step p { font-size: 15px; line-height: 1.65; color: var(--graphite); max-width: 40ch; }

/* ── Адаптив ───────────────────────────────────────────────────────── */
@media (max-width: 1100px) {
    .bm { grid-template-columns: 1fr; }
    .bm-panel { position: static; order: 2; }
    .bm-out { order: 1; }
    .bm-panel { display: grid; grid-template-columns: 1fr 1fr; column-gap: 24px; }
    .bm-panel__head, .bm-row--foot { grid-column: 1 / -1; }
}
@media (max-width: 720px) {
    .bm-panel { grid-template-columns: 1fr; padding: 0 16px 16px; }
    .bm-panel__head { margin: 0 -16px 6px; padding: 14px 16px; }
    .bm-draw { padding: 40px 4px 4px; margin: 0 calc(var(--gutter) * -1); border-left: 0; border-right: 0; }
    .bm-draw__tag { left: 16px; right: 16px; }
    .bm-draw__tag span { max-width: 55%; }
    .bm-stamp { grid-template-columns: 1fr 1fr; }
    .bm-verdict { grid-column: 1 / -1; border-right: 0 !important; border-bottom: 1px solid rgba(245, 242, 232, 0.12); padding: 14px !important; }
    .bm-stamp > .bm-meter { padding: 14px; }
    .bm-meter__head { flex-direction: column; align-items: flex-start; gap: 8px; }
    .bm-facts { grid-template-columns: 1fr 1fr; }
    .bm-facts > div:nth-child(2) { border-right: 0; }
    .bm-facts > div:nth-child(-n+2) { border-bottom: 1px solid rgba(245, 242, 232, 0.12); }
    .bm-steps { grid-template-columns: 1fr; }
    .bm-step, .bm-step + .bm-step { padding: 24px 0; border-right: 0; border-bottom: 1px solid rgba(14, 14, 12, 0.12); }
    .bm-kind span { font-size: 8.5px; }
    .bm-meter__foot { flex-direction: column; gap: 4px; }
    /* креслення на телефоні: без колонки перерізу (його розміри — у фактах нижче), шрифти вдвічі більші */
    .bm-secbox, .bm-note { display: none; }
    .bm-label, .bm-dimtxt { font-size: 24px; }
    .bm-label--q, .bm-label--p { font-size: 25px; }
    .bm-flbl { font-size: 30px; }
    .bm-mlbl { font-size: 26px; }
}
@media (prefers-reduced-motion: reduce) {
    .bm-meter__bar i, .bm-verdict span, .bm-toggle i::after { transition: none; }
}