/* brickcalculator.info — single stylesheet, no framework. */
:root {
  --brick: #b23a1e;
  --brick-dark: #8f2d16;
  --brick-soft: #fbece7;
  --ink: #1d2126;
  --ink-2: #3a4049;
  --muted: #646b75;
  --bg: #faf7f3;
  --card: #ffffff;
  --line: #e6dfd6;
  --line-2: #d6ccc0;
  --field: #ffffff;
  --ok: #1f7a4a;
  --mortar: #d9d1c6;
  --shadow: 0 1px 2px rgba(29, 33, 38, .05), 0 8px 24px rgba(29, 33, 38, .06);
  --radius: 14px;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --brick: #e0654a;
    --brick-dark: #f0846c;
    --brick-soft: #3a211b;
    --ink: #eeeae5;
    --ink-2: #d2ccc5;
    --muted: #a39b92;
    --bg: #15171a;
    --card: #1e2125;
    --line: #2f3338;
    --line-2: #40454c;
    --field: #17191c;
    --ok: #5ccf93;
    --mortar: #4a4540;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 24px rgba(0, 0, 0, .25);
    color-scheme: dark;
  }
}

*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.6;
  color: var(--ink);
  background: var(--bg);
}
img, svg { max-width: 100%; }
a { color: var(--brick); text-underline-offset: 2px; }
a:hover { color: var(--brick-dark); }
h1, h2, h3 { line-height: 1.2; letter-spacing: -.015em; color: var(--ink); }
h1 { font-size: clamp(2rem, 4.4vw, 2.9rem); font-weight: 800; margin: 0 0 .4em; }
h2 { font-size: clamp(1.4rem, 2.6vw, 1.8rem); font-weight: 750; margin: 2em 0 .6em; }
h3 { font-size: 1.15rem; font-weight: 700; margin: 1.6em 0 .4em; }
p, ul, ol { margin: 0 0 1em; }
li { margin-bottom: .35em; }
code { font-family: var(--mono); font-size: .9em; background: var(--brick-soft); padding: .1em .35em; border-radius: 4px; }
.wrap { max-width: 1160px; margin: 0 auto; padding: 0 20px; }
.narrow { max-width: 780px; }
.skip { position: absolute; left: -999px; }
.skip:focus { left: 12px; top: 12px; background: var(--card); padding: 8px 12px; z-index: 10; }

/* Header */
.site-header { background: var(--card); border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 5; }
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 64px; }
.logo { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; color: var(--ink); font-weight: 800; font-size: 1.12rem; letter-spacing: -.02em; }
.logo svg { width: 34px; height: 34px; flex: none; }
.logo span b { color: var(--brick); font-weight: 800; }
.nav-toggle { display: none; background: none; border: 1px solid var(--line-2); border-radius: 8px; padding: 6px 10px; color: var(--ink); font: inherit; font-size: .95rem; cursor: pointer; }
.site-nav ul { list-style: none; display: flex; gap: 4px; margin: 0; padding: 0; flex-wrap: wrap; }
.site-nav li { margin: 0; }
.site-nav a { display: block; padding: 8px 11px; border-radius: 8px; color: var(--ink-2); text-decoration: none; font-size: .93rem; font-weight: 550; }
.site-nav a:hover { background: var(--brick-soft); color: var(--brick-dark); }
.site-nav a[aria-current="page"] { color: var(--brick); background: var(--brick-soft); }
@media (max-width: 960px) {
  .nav-toggle { display: block; }
  .site-nav { display: none; position: absolute; left: 0; right: 0; top: 64px; background: var(--card); border-bottom: 1px solid var(--line); box-shadow: var(--shadow); }
  .site-nav.open { display: block; }
  .site-nav ul { flex-direction: column; padding: 8px 12px 14px; }
  .site-nav a { padding: 11px 12px; font-size: 1rem; }
}

/* Breadcrumbs + hero */
.crumbs { font-size: .88rem; color: var(--muted); margin: 22px 0 0; }
.crumbs ol { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 6px; }
.crumbs li { margin: 0; }
.crumbs li + li::before { content: "/"; margin-right: 6px; color: var(--line-2); }
.crumbs a { color: var(--muted); }
.hero { padding: 26px 0 8px; }
.hero .lede { font-size: 1.12rem; color: var(--ink-2); max-width: 760px; }
.hero .meta { font-size: .88rem; color: var(--muted); }

/* Calculator layout */
.calc { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr); gap: 24px; align-items: start; margin: 18px 0 8px; }
@media (max-width: 900px) { .calc { grid-template-columns: 1fr; } }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); }
.panel { padding: 22px 22px 8px; }
.panel h2 { font-size: 1.12rem; margin: 0 0 14px; display: flex; align-items: center; gap: 10px; }
.step { display: inline-grid; place-items: center; width: 26px; height: 26px; border-radius: 50%; background: var(--brick); color: #fff; font-size: .82rem; font-weight: 800; flex: none; }
.section { border-top: 1px solid var(--line); padding-top: 18px; margin-top: 4px; margin-bottom: 18px; }
.section:first-of-type { border-top: 0; padding-top: 0; }

.units { display: inline-flex; background: var(--bg); border: 1px solid var(--line); border-radius: 10px; padding: 3px; margin-bottom: 18px; }
.units button { border: 0; background: none; font: inherit; font-size: .92rem; font-weight: 650; padding: 7px 14px; border-radius: 8px; color: var(--muted); cursor: pointer; }
.units button[aria-pressed="true"] { background: var(--card); color: var(--brick); box-shadow: 0 1px 3px rgba(0,0,0,.12); }

.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 12px 14px; }
.field { display: flex; flex-direction: column; gap: 5px; min-width: 0; }
.field > label, .field > .label { font-size: .86rem; font-weight: 650; color: var(--ink-2); }
.hint { font-size: .8rem; color: var(--muted); font-weight: 400; }
.input { position: relative; display: flex; align-items: stretch; }
input[type="number"], input[type="text"], select {
  width: 100%; min-width: 0; font: inherit; font-size: 1rem; color: var(--ink);
  background: var(--field); border: 1px solid var(--line-2); border-radius: 9px; padding: 9px 11px; height: 44px;
}
select { padding-right: 30px; appearance: none; background-image: linear-gradient(45deg, transparent 50%, var(--muted) 50%), linear-gradient(135deg, var(--muted) 50%, transparent 50%); background-position: calc(100% - 17px) 19px, calc(100% - 12px) 19px; background-size: 5px 5px; background-repeat: no-repeat; }
.input input { padding-right: 46px; }
.input .unit { position: absolute; right: 10px; top: 50%; transform: translateY(-50%); font-size: .82rem; color: var(--muted); pointer-events: none; }
input:focus-visible, select:focus-visible, button:focus-visible, a:focus-visible { outline: 3px solid color-mix(in srgb, var(--brick) 45%, transparent); outline-offset: 1px; }
input::-webkit-outer-spin-button, input::-webkit-inner-spin-button { opacity: .5; }

.rows { display: flex; flex-direction: column; gap: 10px; margin-bottom: 10px; }
.row { display: grid; grid-template-columns: 1.1fr 1fr 1fr .7fr 38px; gap: 8px; align-items: end; }
.row .field > label { font-size: .78rem; }
.row.no-label .field > label { position: absolute; left: -9999px; }
@media (max-width: 520px) { .row { grid-template-columns: 1fr 1fr .8fr 38px; } .row .name { grid-column: 1 / -1; } }
.icon-btn { width: 38px; height: 44px; border: 1px solid var(--line-2); background: var(--field); color: var(--muted); border-radius: 9px; cursor: pointer; font-size: 1.2rem; line-height: 1; }
.icon-btn:hover { color: var(--brick); border-color: var(--brick); }
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin: 4px 0 6px; }
.chip { border: 1px dashed var(--line-2); background: none; color: var(--ink-2); border-radius: 999px; padding: 6px 12px; font: inherit; font-size: .86rem; font-weight: 600; cursor: pointer; }
.chip:hover { border-color: var(--brick); color: var(--brick); border-style: solid; }

details.more { margin: 6px 0 16px; }
details.more summary { cursor: pointer; font-weight: 650; font-size: .93rem; color: var(--brick); padding: 6px 0; }
details.more[open] summary { margin-bottom: 10px; }

/* Results */
.results { position: sticky; top: 84px; overflow: hidden; }
@media (max-width: 900px) { .results { position: static; } }
.results-head { background: var(--brick); color: #fff; padding: 20px 22px 18px; }
.results-head .k { font-size: .82rem; text-transform: uppercase; letter-spacing: .08em; opacity: .85; font-weight: 700; }
.results-head .big { font-size: clamp(2.4rem, 6vw, 3.2rem); font-weight: 850; letter-spacing: -.03em; line-height: 1.05; margin: 4px 0 2px; font-variant-numeric: tabular-nums; }
.results-head .sub { font-size: .95rem; opacity: .92; }
.results-body { padding: 8px 22px 18px; }
.res-group { padding: 12px 0 6px; border-bottom: 1px solid var(--line); }
.res-group:last-of-type { border-bottom: 0; }
.res-group h3 { font-size: .8rem; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); margin: 4px 0 6px; }
.res-row { display: flex; justify-content: space-between; gap: 12px; padding: 4px 0; font-size: .97rem; }
.res-row span:first-child { color: var(--ink-2); }
.res-row b { font-variant-numeric: tabular-nums; text-align: right; }
.res-row.total { font-size: 1.08rem; padding-top: 8px; }
.res-row.total b { color: var(--brick); }
.res-note { font-size: .8rem; color: var(--muted); margin: 10px 0 0; }
.actions { display: flex; flex-wrap: wrap; gap: 8px; padding: 0 22px 22px; }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 6px; border: 1px solid var(--line-2); background: var(--card); color: var(--ink); border-radius: 9px; padding: 9px 14px; font: inherit; font-size: .9rem; font-weight: 650; cursor: pointer; text-decoration: none; }
.btn:hover { border-color: var(--brick); color: var(--brick); }
.btn.primary { background: var(--brick); border-color: var(--brick); color: #fff; }
.btn.primary:hover { background: var(--brick-dark); border-color: var(--brick-dark); color: #fff; }
.toast { font-size: .85rem; color: var(--ok); padding: 0 22px 14px; min-height: 1em; margin: -10px 0 0; }
.diagram { padding: 14px 22px 4px; border-top: 1px solid var(--line); }
.diagram svg { display: block; width: 100%; height: auto; border-radius: 8px; }
.diagram figcaption { font-size: .8rem; color: var(--muted); margin-top: 6px; }
.warn { background: var(--brick-soft); color: var(--brick-dark); border-radius: 9px; padding: 10px 12px; font-size: .88rem; margin: 10px 0 4px; }

/* Content */
.content { padding: 8px 0 40px; }
.content .narrow > h2:first-child { margin-top: 1.2em; }
.formula { background: var(--card); border: 1px solid var(--line); border-left: 4px solid var(--brick); border-radius: 10px; padding: 14px 16px; font-family: var(--mono); font-size: .92rem; overflow-x: auto; margin: 0 0 1.2em; }
.table-wrap { overflow-x: auto; margin: 0 0 1.4em; border: 1px solid var(--line); border-radius: 12px; background: var(--card); }
table { border-collapse: collapse; width: 100%; font-size: .94rem; }
th, td { text-align: left; padding: 10px 14px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { background: var(--bg); font-size: .82rem; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); }
tr:last-child td { border-bottom: 0; }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; }
.faq details { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 4px 18px; margin-bottom: 10px; }
.faq summary { cursor: pointer; font-weight: 700; padding: 12px 0; list-style-position: outside; }
.faq details[open] summary { border-bottom: 1px solid var(--line); margin-bottom: 12px; }
.callout { background: var(--brick-soft); border-radius: 12px; padding: 16px 18px; margin: 0 0 1.4em; }
.callout p:last-child { margin: 0; }

.tool-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 14px; margin: 0 0 1.5em; }
.tool-card { display: block; padding: 18px; text-decoration: none; color: var(--ink); background: var(--card); border: 1px solid var(--line); border-radius: 12px; transition: border-color .15s, transform .15s; }
.tool-card:hover { border-color: var(--brick); transform: translateY(-2px); color: var(--ink); }
.tool-card b { display: block; color: var(--brick); margin-bottom: 4px; }
.tool-card span { font-size: .9rem; color: var(--muted); }

/* Footer */
.site-footer { border-top: 1px solid var(--line); background: var(--card); padding: 34px 0 26px; font-size: .92rem; color: var(--muted); }
.foot-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 26px; }
@media (max-width: 700px) { .foot-grid { grid-template-columns: 1fr; } }
.site-footer h2 { font-size: .82rem; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); margin: 0 0 10px; }
.site-footer ul { list-style: none; padding: 0; margin: 0; }
.site-footer li { margin-bottom: 6px; }
.site-footer a { color: var(--ink-2); text-decoration: none; }
.site-footer a:hover { color: var(--brick); text-decoration: underline; }
.copyright { margin-top: 24px; padding-top: 16px; border-top: 1px solid var(--line); font-size: .84rem; }

@media print {
  .site-header, .site-footer, .actions, .toast, .content, .crumbs, .units, .chips, .icon-btn, details.more summary { display: none !important; }
  details.more > * { display: block !important; }
  body { background: #fff; font-size: 12pt; }
  .card { box-shadow: none; border: 1px solid #ccc; }
  .calc { grid-template-columns: 1fr 1fr; }
  .results { position: static; }
  .results-head { -webkit-print-color-adjust: exact; print-color-adjust: exact; }
}