/* ASD Toolkit — v1.2: dark (lightened one step in v1.2), single theme in the asdsotiriou.com palette (Elementor global
   colours #252E3F #2C3749 #314259 #3D4D66 #4D6080 #7388AB, text #F8F9FA, face Inter).
   Hatched sections and tick-mark dimensions stay. Layout: app bar + module tabs (bottom bar on
   phones), drawing beside data on wide screens, stacked on phones. Deliberately dark in every
   viewer theme: the owner asked for a dark/black background. */
:root {
  --paper: #1b2230;        /* page: deep slate, a step lighter than v1.1 */
  --sheet: #252e3f;        /* cards: site #252E3F */
  --ink: #f8f9fa;          /* site text */
  --ink-2: #c9d1dd;
  --ink-3: #8b9bb8;        /* toward site #7388AB */
  --rule: #34425a;         /* between site #314259 and #3D4D66 */
  --navy: #141a25;         /* app bar: darkest slate */
  --accent: #6ea8ff;       /* site link blue #1863DC, lifted for a dark ground */
  --accent-soft: #2a3d5e;
  --on-accent: #0b1220;
  --hatch: #7388ab;        /* site #7388AB */
  --steel: #3d4d66;        /* site #3D4D66 */
  --good: #5ccf95; --good-soft: #173527;
  --warn: #f0b14f; --warn-soft: #3b2c12;
  --bad: #f2867f; --bad-soft: #3d1c1a;
  --bar1: #6ea8ff; --bar2: #f0a35e; --bar3: #5ccf95; --bar4: #b89cf0; --bar5: #ef7f9b;
  --font-display: "Inter", "Segoe UI", system-ui, sans-serif;
  --font-body: "Inter", "Segoe UI", system-ui, sans-serif;
  --font-data: "IBM Plex Mono", ui-monospace, "Cascadia Mono", Consolas, monospace;
  --r: 8px;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html, body { margin: 0; }
body { background: var(--paper); color: var(--ink); font: 15px/1.5 var(--font-body); }
button, input, select { font: inherit; color: inherit; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.num, .data { font-family: var(--font-data); font-variant-numeric: tabular-nums; }

/* ---------- app bar */
.bar {
  position: sticky; top: env(safe-area-inset-top, 0px); z-index: 10;
  background: var(--navy); color: #eef2f7; border-bottom: 1px solid var(--rule);
  display: flex; align-items: center; gap: 24px; padding: 0 20px; min-height: 56px;
}
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: inherit; }
.brand-mark { width: 40px; height: auto; flex: none; display: block; }
.brand b { font: 700 19px/1 var(--font-display); letter-spacing: -.01em; display: flex; align-items: center; gap: 8px; }
.ver { font: 600 11px/1 var(--font-data); letter-spacing: .02em; color: var(--accent); background: var(--accent-soft); border: 1px solid #3b5680; border-radius: 999px; padding: 3px 7px; }
.brand small { display: block; font: 500 10px/1.2 var(--font-data); letter-spacing: .14em; text-transform: uppercase; color: #9fb0c6; margin-top: 3px; }
.tabs { display: flex; gap: 2px; margin-left: auto; }
.tab {
  border: 0; background: transparent; color: #8b9bb8; cursor: pointer;
  padding: 18px 14px 15px; border-bottom: 3px solid transparent;
  font: 500 14px/1 var(--font-display); letter-spacing: .04em; text-transform: uppercase;
  display: flex; align-items: center; gap: 8px;
}
.tab svg { width: 18px; height: 18px; }
.tab:hover { color: #fff; }
.tab[aria-selected="true"] { color: #fff; border-bottom-color: var(--accent); }

main { max-width: 1200px; margin: 0 auto; padding-inline: 20px; padding-block: 24px 48px; }
.pane[hidden] { display: none; }
.pane-head { display: flex; flex-wrap: wrap; align-items: baseline; gap: 6px 16px; margin-bottom: 18px; }
.pane-head h1 { font: 700 30px/1.1 var(--font-display); margin: 0; letter-spacing: -.02em; text-wrap: balance; }
.pane-head p { margin: 0; color: var(--ink-2); max-width: 64ch; }

.sheet { background: var(--sheet); border: 1px solid var(--rule); border-radius: var(--r); }
.label { font: 600 11px/1.2 var(--font-data); letter-spacing: .12em; text-transform: uppercase; color: var(--ink-3); }

/* ---------- chips & inputs */
.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chip {
  border: 1px solid var(--rule); background: var(--sheet); color: var(--ink-2);
  border-radius: 999px; padding: 5px 12px; cursor: pointer; font-size: 13.5px; white-space: nowrap;
}
.chip:hover { border-color: var(--accent); color: var(--ink); }
.chip[aria-pressed="true"] { background: var(--accent); border-color: var(--accent); color: var(--on-accent); font-weight: 600; }
.field { display: flex; flex-direction: column; gap: 6px; min-width: 0; }
.input {
  width: 100%; border: 1px solid var(--rule); background: var(--sheet); border-radius: var(--r);
  padding: 10px 12px; font-family: var(--font-data); font-size: 17px;
}
.input:focus { border-color: var(--accent); outline: none; box-shadow: 0 0 0 3px var(--accent-soft); }
.input.big { font-size: 24px; padding: 12px 14px; }
select.input { font-family: var(--font-body); font-size: 15px; }
.err { color: var(--bad); background: var(--bad-soft); border-radius: var(--r); padding: 8px 12px; font-size: 14px; }
.hint { color: var(--ink-3); font-size: 13px; }

/* ---------- units */
.units-grid { display: grid; grid-template-columns: minmax(0, 340px) minmax(0, 1fr); gap: 20px; align-items: start; }
.units-in { padding: 18px; display: flex; flex-direction: column; gap: 16px; }
.units-out { overflow: hidden; }
.conv-row {
  display: grid; grid-template-columns: minmax(0, 1fr) auto auto; align-items: center; gap: 12px;
  padding: 11px 18px; border-bottom: 1px solid var(--rule);
}
.conv-row:last-child { border-bottom: 0; }
.conv-row .v { font: 500 18px/1.2 var(--font-data); text-align: right; overflow-wrap: anywhere; }
.conv-row .u { font: 500 14px/1 var(--font-data); color: var(--ink-2); min-width: 72px; }
.conv-row.src { background: var(--accent-soft); }
.copy { border: 1px solid var(--rule); background: transparent; border-radius: var(--r); padding: 4px 8px; cursor: pointer; color: var(--ink-3); font-size: 12px; }
.copy:hover { color: var(--accent); border-color: var(--accent); }

/* ---------- rebar */
.seg.seg-2 { grid-template-columns: 1fr 1fr; }
.seg.seg-2 button { font: 600 12.5px var(--font-body); letter-spacing: 0; padding: 10px 6px; }
.builder { display: flex; flex-direction: column; gap: 8px; }
.brow { display: grid; grid-template-columns: 12px minmax(0, 1fr) 22px minmax(0, 1fr) 40px; align-items: center; gap: 8px; }
.brow .swatch { margin: 0; }
.brow .op { text-align: center; color: var(--ink-3); font: 600 17px var(--font-data); }
select.pick { font: 600 18px var(--font-data); padding: 9px 10px; cursor: pointer; }
.rm { height: 40px; border: 1px solid var(--rule); background: transparent; border-radius: var(--r); color: var(--ink-3); cursor: pointer; font-size: 14px; }
.rm:hover { color: var(--bad); border-color: var(--bad); }
.add-row { align-self: flex-start; border: 1px dashed var(--ink-3); background: transparent; color: var(--accent); border-radius: var(--r); padding: 8px 14px; cursor: pointer; font-weight: 600; }
.add-row:hover { border-style: solid; border-color: var(--accent); }
.typed summary { cursor: pointer; padding: 4px 0; }
.typed summary:hover { color: var(--accent); }
.rebar-top { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr); gap: 20px; align-items: start; }
.rebar-in { padding: 18px; display: flex; flex-direction: column; gap: 14px; }
.result { padding: 18px; display: flex; flex-direction: column; gap: 14px; }
.total { display: flex; align-items: baseline; flex-wrap: wrap; gap: 4px 12px; }
.total .big { font: 700 46px/1 var(--font-display); letter-spacing: -.03em; }
.total .unit { font: 500 16px var(--font-data); color: var(--ink-2); }
.total .alt { font: 500 15px var(--font-data); color: var(--ink-3); width: 100%; }
.breakdown { width: 100%; border-collapse: collapse; font-size: 14px; }
.breakdown td, .breakdown th { padding: 6px 4px; border-bottom: 1px solid var(--rule); text-align: right; }
.breakdown th { font: 600 11px var(--font-data); letter-spacing: .1em; text-transform: uppercase; color: var(--ink-3); }
.breakdown td:first-child, .breakdown th:first-child { text-align: left; }
.swatch { display: inline-block; width: 10px; height: 10px; border-radius: 50%; margin-right: 8px; vertical-align: 0; }
.drawing { padding: 10px; }
.drawing svg { display: block; width: 100%; height: auto; max-height: 420px; }
.drawing figcaption { padding: 4px 8px 6px; }
.status { display: inline-flex; align-items: center; gap: 6px; padding: 3px 10px; border-radius: 999px; font: 600 12px var(--font-data); letter-spacing: .04em; }
.status.ok { border: 1px solid currentColor; } .status.ok { background: var(--good-soft); color: var(--good); }
.status.no { background: var(--bad-soft); color: var(--bad); }

.tables { margin-top: 22px; display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 20px; }
.tbl-wrap { overflow-x: auto; }
.tbl-head { padding: 14px 16px 8px; display: flex; flex-wrap: wrap; justify-content: space-between; gap: 6px; align-items: baseline; }
.tbl-head h2 { font: 600 17px var(--font-display); margin: 0; letter-spacing: .02em; }
table.grid { border-collapse: collapse; width: 100%; font: 13px var(--font-data); font-variant-numeric: tabular-nums; }
table.grid th, table.grid td { padding: 6px 8px; text-align: right; border-top: 1px solid var(--rule); white-space: nowrap; }
table.grid thead th { color: var(--ink-3); font-weight: 600; border-top: 0; }
table.grid tbody th { color: var(--ink); font-weight: 600; text-align: left; }
table.grid td.meets { background: var(--good-soft); color: var(--good); }
table.grid td.best { background: var(--good); color: var(--on-accent); font-weight: 700; }
table.grid td { cursor: pointer; }
table.grid td:hover { outline: 1px solid var(--accent); outline-offset: -1px; }

/* ---------- sections */
.sec-layout { display: grid; grid-template-columns: 280px minmax(0, 1fr); gap: 20px; align-items: start; }
.picker { display: flex; flex-direction: column; overflow: hidden; position: sticky; top: calc(env(safe-area-inset-top, 0px) + 72px); max-height: calc(100vh - 100px); }
.picker-top { padding: 14px; display: flex; flex-direction: column; gap: 10px; border-bottom: 1px solid var(--rule); }
.seg { display: grid; grid-template-columns: repeat(3, 1fr); border: 1px solid var(--rule); border-radius: var(--r); overflow: hidden; }
.seg button { border: 0; background: transparent; padding: 7px 4px; cursor: pointer; font: 600 12px var(--font-data); letter-spacing: .08em; color: var(--ink-2); }
.seg button + button { border-left: 1px solid var(--rule); }
.seg button[aria-pressed="true"] { background: var(--steel); color: var(--ink); }
.size-list { overflow-y: auto; list-style: none; margin: 0; padding: 4px 0; flex: 1; min-height: 160px; }
.size-list button {
  width: 100%; border: 0; background: transparent; text-align: left; cursor: pointer;
  padding: 6px 14px; display: flex; justify-content: space-between; gap: 8px; font: 14px var(--font-data);
}
.size-list button:hover { background: var(--accent-soft); }
.size-list button[aria-current="true"] { background: var(--accent); color: var(--on-accent); font-weight: 600; }
.size-list .m { color: var(--ink-3); font-size: 12px; }
.size-list button[aria-current="true"] .m { color: inherit; opacity: .8; }
.sec-main { display: flex; flex-direction: column; gap: 20px; min-width: 0; }
.sec-hero { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 0; overflow: hidden; }
.sec-hero .drawing { border-right: 1px solid var(--rule); background: #202838; }
.sec-title { padding: 20px; display: flex; flex-direction: column; gap: 12px; }
.sec-title h2 { font: 700 36px/1.05 var(--font-display); margin: 0; letter-spacing: -.02em; }
.sec-title .sub { color: var(--ink-2); font-size: 14px; }
.dims { display: grid; grid-template-columns: repeat(auto-fill, minmax(92px, 1fr)); gap: 8px; }
.dim { border: 1px solid var(--rule); border-radius: var(--r); padding: 8px 10px; }
.dim .k { font: italic 600 13px var(--font-body); color: var(--ink-3); }
.dim .v { font: 500 18px var(--font-data); }
.dim .v small { font-size: 11px; color: var(--ink-3); margin-left: 3px; }
.unit-toggle { display: flex; gap: 6px; align-items: center; }
.props { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 20px; }
.prop-group { overflow: hidden; }
.prop-group h3 { margin: 0; padding: 12px 16px; font: 600 13px var(--font-data); letter-spacing: .1em; text-transform: uppercase; color: var(--ink-2); border-bottom: 1px solid var(--rule); }
.prop { display: grid; grid-template-columns: 64px minmax(0, 1fr) auto; gap: 10px; align-items: baseline; padding: 8px 16px; border-bottom: 1px solid var(--rule); }
.prop:last-child { border-bottom: 0; }
.prop .sym { font: italic 600 15px var(--font-body); }
.prop .desc { color: var(--ink-3); font-size: 12.5px; }
.prop .conv { display: block; margin-top: 2px; font-size: 11.5px; color: var(--accent); }
.prop .val { font: 500 16px var(--font-data); text-align: right; white-space: nowrap; }
.prop .val small { font-size: 12px; color: var(--ink-3); margin-left: 4px; }
.dagger { color: var(--warn); font-weight: 700; cursor: help; }
.notes { padding: 16px 18px; display: flex; flex-direction: column; gap: 8px; font-size: 13.5px; color: var(--ink-2); }
.notes p { margin: 0; max-width: 90ch; }
.notes .flag { background: var(--warn-soft); color: var(--warn); border-radius: var(--r); padding: 8px 12px; }

footer { max-width: 1200px; margin: 0 auto; padding-inline: 20px; padding-block: 0 32px; color: var(--ink-3); font-size: 12.5px; }
footer p { margin: 0 0 4px; max-width: 100ch; }

/* ---------- drawing */
.dwg-hatch { stroke: var(--hatch); stroke-width: 1; }
.dwg-fill { fill: var(--steel); fill-opacity: .55; }
.dwg-edge { fill: none; stroke: #dbe3ee; }
.dwg-axis { stroke: var(--accent); fill: none; }
.dwg-dim { stroke: var(--ink-2); fill: none; }
.dwg-text { fill: var(--ink); font-family: var(--font-data); }
.dwg-axis-text { fill: var(--accent); font-family: var(--font-data); font-style: italic; }

/* ---------- slab */
.slab-layout { display: grid; grid-template-columns: minmax(0, 400px) minmax(0, 1fr); gap: 20px; align-items: start; }
.slab-in { padding: 18px; display: flex; flex-direction: column; gap: 14px; }
.slab-in [hidden] { display: none !important; }
.seg.seg-4 { grid-template-columns: repeat(4, 1fr); }
.seg.seg-4 button { font: 600 12px/1.25 var(--font-body); letter-spacing: 0; padding: 9px 4px; }
.row2 { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.row3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 10px; }
.slab-in .input { font-size: 16px; padding: 9px 10px; }
.check { display: flex; gap: 10px; align-items: center; color: var(--ink-2); font-size: 14px; cursor: pointer; }
.check input { width: 18px; height: 18px; accent-color: var(--accent); }
.slab-out { display: flex; flex-direction: column; gap: 20px; min-width: 0; }
.slab-hero { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr); overflow: hidden; }
.slab-hero .drawing { border-left: 1px solid var(--rule); background: #202838; }
.slab-result { padding: 20px; display: flex; flex-direction: column; gap: 10px; }
.slab-result .h { display: flex; align-items: baseline; gap: 8px; }
.slab-result .h b { font: 700 64px/1 var(--font-display); letter-spacing: -.03em; }
.slab-result .h span { font: 500 18px var(--font-data); color: var(--ink-2); }
.slab-result .gov { font-size: 14px; color: var(--ink-2); }
.slab-result .gov strong { color: var(--accent); font-weight: 600; }
.kv { display: grid; grid-template-columns: auto 1fr; gap: 3px 14px; font: 13.5px var(--font-data); }
.kv dt { color: var(--ink-3); } .kv dd { margin: 0; text-align: right; }
.checks { width: 100%; border-collapse: collapse; font-size: 13.5px; }
.checks th, .checks td { padding: 9px 12px; border-bottom: 1px solid var(--rule); text-align: left; vertical-align: top; }
.checks th { font: 600 11px var(--font-data); letter-spacing: .1em; text-transform: uppercase; color: var(--ink-3); }
.checks td.num { text-align: right; white-space: nowrap; }
.checks .cl { display: block; color: var(--ink-3); font-size: 11.5px; margin-top: 2px; }
.util { position: relative; height: 6px; background: var(--rule); border-radius: 3px; overflow: hidden; margin-top: 6px; min-width: 70px; }
.util i { position: absolute; inset: 0 auto 0 0; background: var(--good); }
.util.hi i { background: var(--warn); } .util.no i { background: var(--bad); }
.notes h3 { margin: 4px 0 0; font: 600 12px var(--font-data); letter-spacing: .1em; text-transform: uppercase; color: var(--ink-3); }
.notes ul { margin: 0; padding-left: 18px; display: flex; flex-direction: column; gap: 4px; }
.notes .warns li { color: var(--warn); }
.report-btn { align-self: flex-start; }
.dwg-conc { fill: #8a96aa; fill-opacity: .28; }
.dwg-bar { fill: var(--bar2); }
.dwg-u0 { stroke: var(--bad); fill: none; }
.dwg-u1 { stroke: var(--accent); fill: none; }
.dwg-col { fill: var(--steel); stroke: #dbe3ee; }

/* ---------- beam */
.bm-mode { max-width: 420px; margin-bottom: 18px; }
.slab-layout[hidden] { display: none; }
.layers { display: flex; flex-direction: column; gap: 8px; }
.layer { border: 1px solid var(--rule); border-radius: var(--r); padding: 8px; display: flex; flex-direction: column; gap: 6px; }
.layer .lh { display: flex; justify-content: space-between; align-items: center; font: 600 11px var(--font-data); letter-spacing: .08em; color: var(--ink-3); text-transform: uppercase; }
.layer .lh .fitok { color: var(--good); } .layer .lh .fitno { color: var(--bad); }
.grow { display: grid; grid-template-columns: minmax(0, 1fr) 18px minmax(0, 1fr) 36px; gap: 6px; align-items: center; }
.grow .op { text-align: center; color: var(--ink-3); font: 600 15px var(--font-data); }
.grow select.pick { font-size: 16px; padding: 7px 8px; }
.grow .rm { height: 36px; }
.mini { border: 1px dashed var(--ink-3); background: transparent; color: var(--accent); border-radius: var(--r); padding: 5px 10px; cursor: pointer; font: 600 12.5px var(--font-body); }
.mini:hover { border-style: solid; border-color: var(--accent); }
.mini-row { display: flex; gap: 8px; flex-wrap: wrap; }
.unit-in { position: relative; } .unit-in span { position: absolute; right: 10px; top: 50%; transform: translateY(-50%); color: var(--ink-3); font: 12px var(--font-data); pointer-events: none; }
.caps { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; }
.cap { border: 1px solid var(--rule); border-radius: var(--r); padding: 10px 12px; }
.cap .k { font: 600 11px var(--font-data); letter-spacing: .08em; color: var(--ink-3); text-transform: uppercase; }
.cap .v { font: 700 22px/1.1 var(--font-display); margin-top: 4px; overflow-wrap: anywhere; }
.cap .v small { font: 500 12px var(--font-data); color: var(--ink-3); margin-left: 4px; }
.cap .s { font: 12px var(--font-data); color: var(--ink-3); margin-top: 2px; }
.checks tr.grp td { background: #202838; font: 600 11px var(--font-data); letter-spacing: .1em; text-transform: uppercase; color: var(--ink-3); padding: 6px 12px; }
.proposal { font: 600 15px var(--font-data); color: var(--ink); background: var(--accent-soft); border-radius: var(--r); padding: 10px 12px; display: flex; flex-direction: column; gap: 4px; }
.proposal span { color: var(--ink-3); font-weight: 500; font-size: 12px; }
.dwg-link { stroke: var(--good); fill: none; }

/* ---------- navigation & column */
.subnav { margin: -6px 0 18px; }
.subnav .chip { font-size: 14px; padding: 7px 14px; }
.grow3 { display: grid; grid-template-columns: 96px minmax(0, 1fr) minmax(0, 1fr); gap: 6px; align-items: center; }
.grow3 .lbl { font: 600 11px var(--font-data); letter-spacing: .06em; text-transform: uppercase; color: var(--ink-3); }
.grow3 .op { text-align: right; color: var(--ink-3); font: 600 15px var(--font-data); }
.grow3 select.pick { font-size: 16px; padding: 7px 8px; }
#cl-nm svg { display: block; width: 100%; height: auto; max-height: 360px; }
.nm-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.lp-big { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.dwg-curve { fill: none; stroke: var(--accent); }
.dwg-pt { fill: var(--warn); }
.dwg-grid { stroke: var(--rule); }

/* ---------- phones */
@media (max-width: 860px) {
  .units-grid, .rebar-top, .tables, .sec-layout, .sec-hero, .slab-layout, .slab-hero { grid-template-columns: minmax(0, 1fr); }
  .slab-hero .drawing { border-left: 0; border-top: 1px solid var(--rule); }
  .sec-hero .drawing { border-right: 0; border-bottom: 1px solid var(--rule); }
  .picker { position: static; max-height: none; }
  .size-list { max-height: 260px; }
}
@media (max-width: 720px) {
  .tabs {
    position: fixed; left: 0; right: 0; bottom: 0; margin: 0; z-index: 20;
    background: var(--navy); justify-content: space-around; gap: 0;
    padding-bottom: env(safe-area-inset-bottom, 0px); border-top: 1px solid rgba(255,255,255,.08);
  }
  .tab { flex-direction: column; gap: 5px; padding: 10px 8px 9px; font-size: 11px; border-bottom: 0; border-top: 3px solid transparent; flex: 1; }
  .tab[aria-selected="true"] { border-top-color: var(--accent); }
  main { padding-block: 18px 110px; }
  footer { padding-bottom: 96px; }
  .pane-head h1 { font-size: 24px; }
  .total .big { font-size: 38px; }
  .sec-title h2 { font-size: 28px; }
  .slab-result .h b { font-size: 52px; }
  .nm-grid { grid-template-columns: 1fr; }
  .tab { padding-inline: 4px; letter-spacing: .02em; }
}
@media (prefers-reduced-motion: no-preference) {
  .chip, .tab, .size-list button, .copy { transition: background-color .12s, color .12s, border-color .12s; }
}