/* SiteCalc landing — DATUM identity
   Tokens verbatim from the identity proposal. Square corners, hairlines,
   no shadows, no gradients. Red is reserved: proposals only. */

@font-face {
  font-family: 'Archivo';
  font-style: normal;
  font-weight: 500 800;
  font-display: swap;
  src: url('fonts/archivo-var.woff2') format('woff2');
}
@font-face {
  font-family: 'Public Sans';
  font-style: normal;
  font-weight: 400 600;
  font-display: swap;
  src: url('fonts/public-sans-var.woff2') format('woff2');
}
@font-face {
  font-family: 'Spline Sans Mono';
  font-style: normal;
  font-weight: 400 500;
  font-display: swap;
  src: url('fonts/spline-sans-mono-var.woff2') format('woff2');
}

:root {
  --paper: #F6F8F5;
  --paper-2: #EDF1EB;
  --ink: #13291F;
  --ink-2: #3E5348;
  --stone: #66786D;
  --line: #CAD6CB;
  --grid: #DFE8DE;
  --panel: #0E3628;
  --panel-2: #0A2A1F;
  --on-panel: #EFF5EF;
  --on-panel-dim: #9DB6A7;
  --panel-line: rgba(239, 245, 239, 0.16);
  --red: #C03B21;
  --red-soft: rgba(192, 59, 33, 0.07);
  --red-on-panel: #E2593B;
  --fd: 'Archivo', 'Helvetica Neue', Arial, sans-serif;
  --fb: 'Public Sans', system-ui, sans-serif;
  --fm: 'Spline Sans Mono', ui-monospace, 'SF Mono', Consolas, monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --paper: #0B1D16;
    --paper-2: #112620;
    --ink: #E9F1EA;
    --ink-2: #BBCCC0;
    --stone: #84978A;
    --line: #234134;
    --grid: #17332A;
    --red: #E2593B;
    --red-soft: rgba(226, 90, 59, 0.13);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --paper: #0B1D16;
  --paper-2: #112620;
  --ink: #E9F1EA;
  --ink-2: #BBCCC0;
  --stone: #84978A;
  --line: #234134;
  --grid: #17332A;
  --red: #E2593B;
  --red-soft: rgba(226, 90, 59, 0.13);
  color-scheme: dark;
}
:root[data-theme="light"] {
  --paper: #F6F8F5;
  --paper-2: #EDF1EB;
  --ink: #13291F;
  --ink-2: #3E5348;
  --stone: #66786D;
  --line: #CAD6CB;
  --grid: #DFE8DE;
  --red: #C03B21;
  --red-soft: rgba(192, 59, 33, 0.07);
  color-scheme: light;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 17px/1.65 var(--fb);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
::selection { background: var(--panel); color: var(--on-panel); }
a { color: inherit; }
:focus-visible { outline: 2px solid currentColor; outline-offset: 3px; }
svg text { user-select: none; }

/* ---------- shared registers ---------- */
.mono { font-family: var(--fm); font-variant-numeric: tabular-nums; }
.eyebrow {
  font: 500 12px/1 var(--fm);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--stone);
  margin: 0 0 22px;
}
.wrap { max-width: 1140px; margin: 0 auto; padding: 0 24px; }

h1, h2 {
  font-family: var(--fd);
  text-transform: uppercase;
  text-wrap: balance;
  margin: 0;
}
h1 { font-size: clamp(40px, 6.6vw, 84px); font-weight: 800; line-height: 0.98; letter-spacing: 0.012em; }
h2 { font-size: clamp(28px, 3.6vw, 46px); font-weight: 750; line-height: 1.04; letter-spacing: 0.02em; }
p  { margin: 0; }
.body { max-width: 34em; color: var(--ink-2); font-size: 17.5px; }
.body strong { color: var(--ink); font-weight: 600; }

/* ---------- buttons ---------- */
.btn {
  display: inline-block;
  background: var(--panel);
  color: var(--on-panel);
  border: 1px solid var(--panel);
  font: 600 12.5px/1 var(--fd);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  text-decoration: none;
  padding: 17px 28px;
  cursor: pointer;
}
.btn:hover { background: var(--panel-2); border-color: var(--panel-2); }
.btn--ghost { background: transparent; color: var(--ink); border: 1px solid var(--line); }
.btn--ghost:hover { border-color: var(--ink); background: transparent; }
.btn--sm { padding: 11px 18px; font-size: 11.5px; }

/* ---------- nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 40;
  background: var(--paper);
  border-bottom: 1px solid var(--line);
}
.nav .wrap {
  display: flex; align-items: center; justify-content: space-between;
  height: 62px;
}
.wordmark {
  display: inline-flex; align-items: baseline; gap: 1px;
  font: 800 19px/1 var(--fd);
  letter-spacing: 0.075em;
  text-decoration: none;
}
.wordmark svg { width: 0.82em; height: 0.82em; transform: translateY(0.02em); margin: 0 0.06em; }
.wordmark .tri { stroke: currentColor; fill: none; stroke-width: 11; }
.wordmark .datum { fill: var(--red); }
.beta {
  font: 500 9.5px/1 var(--fm);
  letter-spacing: 0.22em;
  color: var(--stone);
  border: 1px solid var(--line);
  padding: 4px 6px 3px 8px;
  margin-left: 12px;
  transform: translateY(-0.45em);
  display: inline-block;
}
.nav-right { display: flex; align-items: center; gap: 26px; }
.nav-link {
  font: 500 11.5px/1 var(--fm); letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--stone); text-decoration: none;
}
.nav-link:hover { color: var(--ink); }
@media (max-width: 620px) { .nav-link { display: none; } }

/* ---------- hero ---------- */
.hero { padding: clamp(72px, 9vw, 128px) 0 0; text-align: center; }
.hero .eyebrow { margin-bottom: 28px; }
.hero h1 { max-width: 13em; margin: 0 auto; }
.hero .lede {
  max-width: 36em; margin: 28px auto 0;
  color: var(--ink-2); font-size: clamp(17px, 1.6vw, 19.5px);
}
.hero .ctas { display: flex; gap: 14px; justify-content: center; margin: 40px 0 0; flex-wrap: wrap; }
.hero .fig { margin: clamp(56px, 7vw, 96px) auto 0; max-width: 920px; }
.strip {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  margin-top: clamp(56px, 7vw, 88px);
  padding: 13px 0;
  font: 500 11px/1 var(--fm);
  letter-spacing: 0.24em;
  color: var(--stone);
  text-transform: uppercase;
}

/* ---------- sheets ---------- */
.sheet { padding: clamp(88px, 11vw, 148px) 0; border-top: 1px solid var(--line); }
.sheet--panel {
  background: var(--panel);
  border-top: none;
  --ink: var(--on-panel);
  --ink-2: var(--on-panel-dim);
  --stone: var(--on-panel-dim);
  --line: var(--panel-line);
  --grid: rgba(239, 245, 239, 0.06);
  --red: var(--red-on-panel);
  --red-soft: rgba(226, 90, 59, 0.14);
  --paper-2: var(--panel-2);
  color: var(--on-panel);
  color-scheme: dark;
}
.sheet-grid {
  display: grid;
  grid-template-columns: minmax(0, 10fr) minmax(0, 13fr);
  gap: clamp(48px, 6vw, 88px);
  align-items: center;
}
.sheet-grid--flip { grid-template-columns: minmax(0, 13fr) minmax(0, 10fr); }
.sheet-grid--flip > .sheet-copy { order: 2; }
.sheet-grid--flip > .sheet-fig  { order: 1; }
.sheet-copy > * + * { margin-top: 24px; }
.sheet-copy .body { margin-top: 26px; }
@media (max-width: 880px) {
  .sheet-grid { grid-template-columns: minmax(0, 1fr); }
  .sheet-grid--flip > .sheet-copy { order: 1; }
  .sheet-grid--flip > .sheet-fig  { order: 2; }
}

/* ---------- figures ---------- */
.fig { margin: 0; }
.fig-frame {
  border: 1px solid var(--line);
  background:
    repeating-linear-gradient(to right, var(--grid) 0 1px, transparent 1px 32px),
    repeating-linear-gradient(to bottom, var(--grid) 0 1px, transparent 1px 32px);
  background-color: var(--paper);
  padding: clamp(10px, 2vw, 22px);
}
.sheet--panel .fig-frame { background-color: var(--panel); }
.fig svg { display: block; width: 100%; height: auto; }
.fig figcaption {
  display: flex; justify-content: space-between; gap: 16px;
  font: 500 10.5px/1.5 var(--fm);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--stone);
  padding-top: 12px;
}

/* svg registers (all colours via tokens so themes + panels hold) */
.s-parcel { stroke: var(--ink); stroke-width: 2; fill: none; stroke-linejoin: miter; }
.s-hair   { stroke: var(--line); stroke-width: 1; fill: none; }
.s-dim    { stroke: var(--stone); stroke-width: 1; fill: none; }
.s-dimtxt { font: 500 12.5px var(--fm); fill: var(--ink); }
.s-lbl    { font: 500 10.5px var(--fm); letter-spacing: 0.14em; fill: var(--stone); }
.s-lbl-ink{ font: 500 11.5px var(--fm); letter-spacing: 0.1em; fill: var(--ink); }
.s-red    { stroke: var(--red); stroke-width: 2; fill: var(--red-soft); stroke-linejoin: miter; }
.s-redtxt { font: 500 11.5px var(--fm); letter-spacing: 0.1em; fill: var(--red); }
.s-off    { stroke: var(--stone); stroke-width: 1; stroke-dasharray: 5 4; fill: none; }
.s-cont   { stroke: var(--stone); stroke-width: 1; fill: none; opacity: 0.75; }
.s-cont-major { stroke: var(--ink); stroke-width: 1.6; fill: none; }
.s-pt       { fill: var(--panel); }
.sheet--panel .s-pt { fill: var(--on-panel); }
.s-pt-hollow{ fill: none; stroke: var(--stone); stroke-width: 1.4; }
.s-halo { paint-order: stroke; stroke: var(--paper); stroke-width: 7; stroke-linejoin: round; }
.sheet--panel .s-halo { stroke: var(--panel); }
:root[data-theme="dark"] .s-halo { stroke: var(--paper); }
:root[data-theme="dark"] .sheet--panel .s-halo { stroke: var(--panel); }

/* draw-on animation */
.draw { stroke-dasharray: 1; stroke-dashoffset: 1; }
.go .draw { transition: stroke-dashoffset 1.3s cubic-bezier(0.4, 0, 0.2, 1); stroke-dashoffset: 0; }
.fade { opacity: 0; transition: opacity 0.7s ease; }
.go .fade { opacity: 1; }
.go .d1 { transition-delay: 0.55s; }
.go .d2 { transition-delay: 0.95s; }
.go .d3 { transition-delay: 1.35s; }
.go .d4 { transition-delay: 1.8s; }

/* scroll reveal */
.rv { opacity: 0; transform: translateY(18px); transition: opacity 0.75s ease, transform 0.75s ease; }
.rv.in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .draw { stroke-dashoffset: 0; }
  .fade { opacity: 1; transition: none; }
  .rv { opacity: 1; transform: none; transition: none; }
}

/* ---------- measured: strike pair ---------- */
.strike-pair { display: flex; flex-direction: column; gap: 10px; }
.strike-pair .row {
  display: flex; align-items: baseline; gap: 14px;
  font: 500 15px var(--fm);
}
.strike-pair .num { font-size: 24px; }
.strike-pair .bad .num { color: var(--stone); text-decoration: line-through; text-decoration-color: var(--red); text-decoration-thickness: 2px; }
.strike-pair .tag { font-size: 10.5px; letter-spacing: 0.14em; color: var(--stone); text-transform: uppercase; }
.strike-pair .good .num { color: var(--ink); font-weight: 500; }

/* ---------- data rows ---------- */
.datarow {
  display: flex; flex-wrap: wrap; gap: 10px 34px;
  border-top: 1px solid var(--line);
  padding-top: 16px;
  font: 500 12px/1.5 var(--fm);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--stone);
}
.datarow b { color: var(--ink); font-weight: 500; }

/* ---------- register ledger + matrix ---------- */
.ledger { border: 1px solid var(--line); background: var(--paper-2); }
.ledger-row {
  display: flex; justify-content: space-between; align-items: baseline; gap: 18px;
  padding: 13px 18px;
  border-top: 1px solid var(--line);
  font: 500 13px var(--fm);
}
.ledger-row:first-child { border-top: none; }
.ledger-row .k { font-size: 10.5px; letter-spacing: 0.16em; color: var(--stone); text-transform: uppercase; white-space: nowrap; }
.ledger-row .v { text-align: right; }

.matrix { margin-top: 14px; border: 1px solid var(--line); background: var(--paper-2); padding: 18px; overflow-x: auto; }
.matrix table { border-collapse: collapse; width: 100%; min-width: 430px; }
.matrix th, .matrix td { padding: 9px 6px; text-align: center; }
.matrix th {
  font: 500 9.5px var(--fm); letter-spacing: 0.14em; color: var(--stone); text-transform: uppercase;
  border-bottom: 1px solid var(--line);
}
.matrix th:first-child, .matrix td:first-child {
  text-align: left; font: 500 11px var(--fm); letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink);
  padding-right: 14px; white-space: nowrap;
}
.matrix .peg { width: 11px; height: 11px; background: var(--ink); display: inline-block; }
.matrix .peg--red { background: var(--red); }
.matrix .rec {
  display: block; font: 500 8.5px var(--fm); letter-spacing: 0.12em; color: var(--red); margin-top: 5px;
}

/* ---------- envelope controls ---------- */
.controls { display: flex; flex-direction: column; gap: 18px; border: 1px solid var(--line); padding: 22px; background: var(--paper-2); }
.ctl { display: grid; grid-template-columns: 92px 1fr 64px; align-items: center; gap: 16px; }
.ctl label { font: 500 10.5px var(--fm); letter-spacing: 0.16em; color: var(--stone); text-transform: uppercase; }
.ctl output { font: 500 14px var(--fm); color: var(--ink); text-align: right; }
input[type="range"] {
  -webkit-appearance: none; appearance: none;
  width: 100%; height: 22px; background: transparent; cursor: pointer; margin: 0;
}
input[type="range"]::-webkit-slider-runnable-track { height: 2px; background: var(--line); }
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none;
  width: 15px; height: 15px; margin-top: -6.5px;
  background: var(--panel); border: none; border-radius: 0;
}
:root[data-theme="dark"] input[type="range"]::-webkit-slider-thumb { background: var(--ink); }
input[type="range"]::-moz-range-track { height: 2px; background: var(--line); }
input[type="range"]::-moz-range-thumb { width: 15px; height: 15px; background: var(--panel); border: none; border-radius: 0; }
.env-readout {
  display: flex; justify-content: space-between; align-items: baseline;
  border-top: 1px solid var(--line); padding-top: 16px;
  font: 500 11px var(--fm); letter-spacing: 0.14em; text-transform: uppercase; color: var(--stone);
}
.env-readout b { font: 500 26px var(--fm); color: var(--red); letter-spacing: 0; }
.env-readout b small { font-size: 14px; letter-spacing: 0.06em; }

/* ---------- verdict + steps ---------- */
.verdict { border: 1px solid var(--line); padding: 30px 30px 26px; background: var(--paper-2); }
.verdict .n { font: 800 clamp(84px, 9vw, 128px)/0.9 var(--fd); color: var(--red); display: block; }
.verdict .what { font: 700 15px var(--fd); letter-spacing: 0.12em; text-transform: uppercase; margin-top: 18px; }
.verdict .how { color: var(--ink-2); font-size: 15px; margin-top: 8px; max-width: 30em; }
.verdict .datarow { margin-top: 22px; }

.steps { list-style: none; margin: 0; padding: 0; counter-reset: step; }
.steps li { border-top: 1px solid var(--line); padding: 24px 0; display: grid; grid-template-columns: 58px minmax(0, 1fr); gap: 18px; }
.steps li > div { min-width: 0; }
.steps li:first-child { border-top: none; padding-top: 0; }
.steps .num { font: 500 13px var(--fm); color: var(--stone); letter-spacing: 0.1em; padding-top: 3px; }
.steps h3 { font: 700 14px var(--fd); letter-spacing: 0.14em; text-transform: uppercase; margin: 0 0 7px; }
.steps p { color: var(--ink-2); font-size: 15.5px; max-width: 34em; }
.copyline {
  display: flex; align-items: stretch; margin-top: 14px; max-width: 460px;
  border: 1px solid var(--line);
}
.copyline code {
  flex: 1; font: 500 13px/1 var(--fm); color: var(--ink);
  padding: 13px 14px; overflow-x: auto; white-space: nowrap; background: var(--paper-2);
}
.copyline button {
  font: 600 10.5px var(--fd); letter-spacing: 0.14em;
  background: var(--panel); color: var(--on-panel); border: none; border-left: 1px solid var(--line);
  padding: 0 18px; cursor: pointer;
}
.copyline button:hover { background: var(--panel-2); }

/* ---------- footer title block ---------- */
.titleblock {
  background: var(--panel); color: var(--on-panel);
  border-top: 1px solid var(--panel-2);
  color-scheme: dark;
}
.titleblock .wrap { padding-top: 64px; padding-bottom: 44px; }
.tb-mark { display: flex; align-items: center; gap: 18px; margin-bottom: 40px; }
.tb-mark .wordmark { color: var(--on-panel); font-size: 21px; }
.tb-mark .wordmark .datum { fill: var(--red-on-panel); }
.tb-grid {
  display: grid; grid-template-columns: repeat(4, minmax(0, 1fr));
  border: 1px solid var(--panel-line);
}
.tb-cell { border-left: 1px solid var(--panel-line); padding: 14px 16px 12px; }
.tb-cell:first-child { border-left: none; }
.tb-grid + .tb-grid { border-top: none; }
.tb-cell .k { display: block; font: 500 9px var(--fm); letter-spacing: 0.2em; color: var(--on-panel-dim); text-transform: uppercase; margin-bottom: 6px; }
.tb-cell .v { font: 500 13px var(--fm); color: var(--on-panel); }
@media (max-width: 720px) {
  .tb-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .tb-cell:nth-child(3) { border-left: none; border-top: 1px solid var(--panel-line); }
  .tb-cell:nth-child(4) { border-top: 1px solid var(--panel-line); }
}
.tb-note {
  margin-top: 28px; font-size: 13.5px; color: var(--on-panel-dim); max-width: 46em;
}
.tb-legal {
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px;
  margin-top: 34px; padding-top: 18px; border-top: 1px solid var(--panel-line);
  font: 500 10.5px var(--fm); letter-spacing: 0.14em; text-transform: uppercase; color: var(--on-panel-dim);
}