/* Plain Systems — site styles.
   The Dossier look: Sora + IBM Plex Mono, warm paper, one tan accent,
   hairline rules, 2-3px radii. Engineering drawing, not marketing page. */

:root {
  --paper: #fbfaf7;
  --surface: #ffffff;
  --sunk: #f4f1ea;
  --ink: #0b0b0b;
  --ink-2: #52514e;
  --faint: #7a776f;
  --rule: #e2ded5;
  --rule-hard: #cfc9bc;
  --accent: #8c5a2b;
  --accent-soft: #f2ece3;
  --ok: #3f6b4a; --ok-bg: #e9f0ea;
  --warn: #8a6a1f; --warn-bg: #f6efdd;
  --stop: #8a2f2f; --stop-bg: #f7e9e7;
  --dead: #6f6c66; --dead-bg: #eeebe4;
  --btn-bg: #0b0b0b; --btn-fg: #fbfaf7;
  --s0: #c4bdb0;
  --s1: #2a78d6; --s2: #eb6834; --s3: #1baf7a; --s4: #eda100;
  --s5: #e87ba4; --s6: #008300; --s7: #4a3aa7; --s8: #e34948; --s9: #117a8b; --s10: #a0522d; --s11: #6d6d1a; --s12: #8b2d8b;
  --sans: "Sora", "Segoe UI Variable Text", "Segoe UI", system-ui, sans-serif;
  --mono: "IBM Plex Mono", "Cascadia Mono", Consolas, ui-monospace, monospace;
  --radius: 3px;
  --wrap: 1080px;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --paper: #121110; --surface: #1a1917; --sunk: #201e1b;
    --ink: #f3f0ea; --ink-2: #a19b91; --faint: #8d877e;
    --rule: #2e2b27; --rule-hard: #403b34;
    --accent: #d2925a; --accent-soft: #2a221a;
    --ok: #83b191; --ok-bg: #1d2a21;
    --warn: #d6ae55; --warn-bg: #2b2416;
    --stop: #dd8880; --stop-bg: #2e1c1a;
    --dead: #8d877e; --dead-bg: #232120;
    --btn-bg: #f3f0ea; --btn-fg: #121110;
    --s0: #57514a;
    --s1: #3987e5; --s2: #d95926; --s3: #199e70; --s4: #c98500;
    --s5: #d55181; --s6: #008300; --s7: #9085e9; --s8: #e66767; --s9: #2aa3b8; --s10: #c8734a; --s11: #a3a32f; --s12: #c05ac0;
  }
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --paper: #121110; --surface: #1a1917; --sunk: #201e1b;
  --ink: #f3f0ea; --ink-2: #a19b91; --faint: #8d877e;
  --rule: #2e2b27; --rule-hard: #403b34;
  --accent: #d2925a; --accent-soft: #2a221a;
  --ok: #83b191; --ok-bg: #1d2a21;
  --warn: #d6ae55; --warn-bg: #2b2416;
  --stop: #dd8880; --stop-bg: #2e1c1a;
  --dead: #8d877e; --dead-bg: #232120;
  --btn-bg: #f3f0ea; --btn-fg: #121110;
  --s0: #57514a;
  --s1: #3987e5; --s2: #d95926; --s3: #199e70; --s4: #c98500;
  --s5: #d55181; --s6: #008300; --s7: #9085e9; --s8: #e66767; --s9: #2aa3b8; --s10: #c8734a; --s11: #a3a32f; --s12: #c05ac0;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: calc(64px + env(safe-area-inset-top, 0px)); }
body {
  margin: 0; background: var(--paper); color: var(--ink);
  font-family: var(--sans); font-size: 15.5px; line-height: 1.62; font-weight: 400;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; }
h1, h2, h3, h4 { margin: 0; text-wrap: balance; font-family: var(--sans); }
p { margin: 0; }
a { color: var(--accent); text-decoration: none; border-bottom: 1px solid color-mix(in srgb, var(--accent) 35%, transparent); }
a:hover { border-bottom-color: var(--accent); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 2px; }
code, .mono { font-family: var(--mono); }
code { font-size: .86em; background: var(--sunk); padding: .12em .38em; border-radius: 2px; word-break: break-word; }
.num { font-variant-numeric: tabular-nums; }
.wrap { max-width: var(--wrap); margin: 0 auto; padding-inline: 20px; }
@media (max-width: 480px) { .wrap { padding-inline: 16px; } }
.visually-hidden { position: absolute !important; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* ---------- top bar ---------- */
.bar {
  position: sticky; top: env(safe-area-inset-top, 0px); z-index: 40;
  background: color-mix(in srgb, var(--paper) 92%, transparent);
  -webkit-backdrop-filter: blur(10px); backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--rule);
}
.bar-in { max-width: var(--wrap); margin: 0 auto; padding: 10px 20px; display: flex; align-items: center; gap: 22px; flex-wrap: wrap; }
.mark { font-weight: 700; letter-spacing: -.03em; font-size: 16px; white-space: nowrap; color: var(--ink); border: 0; }
.mark span { font-weight: 300; color: var(--ink-2); }
.mark:hover { border: 0; }
.nav { display: flex; gap: 18px; flex-wrap: wrap; font-family: var(--mono); font-size: 11px; letter-spacing: .08em; text-transform: uppercase; }
.nav a { color: var(--ink-2); border: 0; padding-block: 4px; }
.nav a:hover, .nav a[aria-current="page"] { color: var(--ink); }
.nav a[aria-current="page"] { box-shadow: inset 0 -1px 0 var(--ink); }
.bar-end { margin-left: auto; display: flex; gap: 10px; align-items: center; }
@media (max-width: 640px) { .nav { order: 3; width: 100%; gap: 14px; } .bar-in { gap: 10px 16px; } }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font: 600 14px/1 var(--sans); letter-spacing: -.005em;
  padding: 12px 18px; border-radius: var(--radius); border: 1px solid var(--btn-bg);
  background: var(--btn-bg); color: var(--btn-fg); cursor: pointer; text-decoration: none;
}
.btn:hover { border-color: var(--btn-bg); opacity: .88; }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--rule-hard); }
.btn-ghost:hover { border-color: var(--ink); opacity: 1; }
.btn-sm { padding: 8px 12px; font-size: 13px; }
.btn[disabled] { opacity: .45; cursor: not-allowed; }
.link-btn { all: unset; cursor: pointer; color: var(--accent); border-bottom: 1px solid color-mix(in srgb, var(--accent) 35%, transparent); font: inherit; }
.link-btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* ---------- hero ---------- */
.hero { padding-block: 64px 48px; border-bottom: 1px solid var(--rule); }
.eyebrow { font-family: var(--mono); font-size: 11.5px; letter-spacing: .17em; text-transform: uppercase; color: var(--accent); margin-bottom: 18px; }
.hero h1 { font-size: clamp(38px, 7.2vw, 68px); font-weight: 700; letter-spacing: -.04em; line-height: 1.0; }
.hero h1 .dim, h2 .dim { color: var(--ink-2); font-weight: 300; }
.lede { font-size: clamp(16px, 2.2vw, 19px); color: var(--ink-2); margin-top: 22px; max-width: 58ch; line-height: 1.6; }
.actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 30px; align-items: center; }
.stamp {
  display: inline-flex; gap: 10px; align-items: center; flex-wrap: wrap;
  font-family: var(--mono); font-size: 11.5px; color: var(--ink-2);
  border: 1px solid var(--rule-hard); border-radius: 2px; padding: 7px 12px; background: var(--surface);
}
.dot { width: 6px; height: 6px; border-radius: 50%; background: var(--ok); display: inline-block; }

/* Engineering-drawing title block: sheet, revision, date. */
.titleblock {
  display: grid; grid-template-columns: repeat(4, auto); width: max-content; max-width: 100%;
  border: 1px solid var(--rule-hard); font-family: var(--mono); font-size: 10.5px; letter-spacing: .08em;
  text-transform: uppercase; color: var(--ink-2); background: var(--surface); margin-top: 36px;
}
.titleblock div { padding: 6px 12px; border-left: 1px solid var(--rule-hard); }
.titleblock div:first-child { border-left: 0; }
.titleblock b { display: block; font-weight: 500; color: var(--faint); font-size: 9.5px; }
@media (max-width: 520px) { .titleblock { grid-template-columns: repeat(2, auto); } .titleblock div:nth-child(3) { border-left: 0; } .titleblock div:nth-child(n+3) { border-top: 1px solid var(--rule-hard); } }

/* ---------- sections ---------- */
section { padding-block: 56px; border-bottom: 1px solid var(--rule); }
section:last-of-type { border-bottom: 0; }
.sec-head { display: flex; align-items: baseline; gap: 14px; margin-bottom: 10px; flex-wrap: wrap; }
.sec-head h2 { font-size: clamp(24px, 3.6vw, 32px); font-weight: 600; letter-spacing: -.03em; line-height: 1.15; }
.kicker { font-family: var(--mono); font-size: 11px; letter-spacing: .14em; text-transform: uppercase; color: var(--faint); }
.sec-note { color: var(--ink-2); margin: 0 0 28px; max-width: 64ch; }
.label { font-family: var(--mono); font-size: 10.5px; letter-spacing: .12em; text-transform: uppercase; color: var(--faint); }

/* Panels joined by 2px rule gaps — the Dossier's "layers". */
.layers { display: grid; gap: 1px; background: var(--rule); border: 1px solid var(--rule); border-radius: var(--radius); overflow: hidden; }
@media (min-width: 760px) { .layers.cols-3 { grid-template-columns: repeat(3, 1fr); } .layers.cols-2 { grid-template-columns: repeat(2, 1fr); } .layers.cols-4 { grid-template-columns: repeat(4, 1fr); } }
.layer { background: var(--surface); padding: 24px; display: flex; flex-direction: column; gap: 10px; min-width: 0; }
.layer h3 { font-size: 17px; font-weight: 600; letter-spacing: -.015em; }
.layer .role { font-family: var(--mono); font-size: 10.5px; letter-spacing: .11em; text-transform: uppercase; color: var(--accent); }
.layer p { color: var(--ink-2); font-size: 14.5px; }
.layer .foot { font-family: var(--mono); font-size: 11px; color: var(--faint); border-top: 1px solid var(--rule); padding-top: 10px; margin-top: auto; display: flex; justify-content: space-between; gap: 10px; flex-wrap: wrap; align-items: center; }

.pill { display: inline-block; font-family: var(--mono); font-size: 10px; letter-spacing: .08em; text-transform: uppercase; padding: 3px 7px; border-radius: 2px; font-weight: 600; white-space: nowrap; }
.p-live { background: var(--ok-bg); color: var(--ok); }
.p-new { background: var(--accent-soft); color: var(--accent); }
.p-hold { background: var(--warn-bg); color: var(--warn); }
.p-none { background: var(--dead-bg); color: var(--dead); }

/* Numbered steps: only where the content is a real sequence. */
.steps { list-style: none; margin: 0; padding: 0; counter-reset: step; display: grid; gap: 1px; background: var(--rule); border: 1px solid var(--rule); border-radius: var(--radius); overflow: hidden; }
@media (min-width: 760px) { .steps { grid-template-columns: repeat(3, 1fr); } }
.steps li { counter-increment: step; background: var(--surface); padding: 24px 24px 26px; position: relative; }
.steps li::before { content: counter(step, decimal-leading-zero); font-family: var(--mono); font-size: 12px; color: var(--accent); font-weight: 600; display: block; margin-bottom: 14px; }
.steps h3 { font-size: 17px; font-weight: 600; letter-spacing: -.015em; margin-bottom: 8px; }
.steps p { color: var(--ink-2); font-size: 14.5px; }

/* ---------- forms ---------- */
.field { display: grid; gap: 6px; }
.field label, .field .lab { font-size: 13px; font-weight: 600; }
.field .hint { font-size: 12.5px; color: var(--ink-2); }
input[type="text"], input[type="email"], input[type="password"], input[type="number"], input[type="date"], select, textarea {
  font: 400 15px/1.4 var(--sans); color: var(--ink); background: var(--surface);
  border: 1px solid var(--rule-hard); border-radius: var(--radius); padding: 10px 12px; width: 100%; min-width: 0;
}
textarea { resize: vertical; min-height: 64px; }
input:focus-visible, select:focus-visible, textarea:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; border-color: var(--accent); }
input.mono { font-family: var(--mono); font-size: 13px; }
.check { display: flex; gap: 10px; align-items: flex-start; font-size: 14px; }
.check input { margin-top: 4px; accent-color: var(--ink); }
.form-msg { font-size: 14px; min-height: 1.5em; }
.form-msg.err { color: var(--stop); }
.form-msg.ok { color: var(--ok); }

.panel { background: var(--surface); border: 1px solid var(--rule); border-radius: var(--radius); padding: 24px; }

/* ---------- tables ---------- */
.tblwrap { overflow-x: auto; border: 1px solid var(--rule); border-radius: var(--radius); background: var(--surface); }
table { border-collapse: collapse; width: 100%; font-size: 14px; }
th, td { text-align: left; padding: 11px 14px; border-bottom: 1px solid var(--rule); vertical-align: top; }
th { font-family: var(--mono); font-size: 10.5px; letter-spacing: .11em; text-transform: uppercase; color: var(--faint); font-weight: 500; background: var(--sunk); }
tr:last-child td { border-bottom: 0; }

/* ---------- FAQ ---------- */
.faq { display: grid; gap: 0; border-top: 1px solid var(--rule); }
.faq details { border-bottom: 1px solid var(--rule); padding: 16px 0; }
.faq summary { cursor: pointer; font-weight: 600; font-size: 16px; list-style: none; display: flex; justify-content: space-between; gap: 16px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; font-family: var(--mono); color: var(--accent); font-weight: 500; }
.faq details[open] summary::after { content: "–"; }
.faq details p { color: var(--ink-2); margin-top: 10px; max-width: 68ch; }

/* ---------- footer ---------- */
.foot-site { padding-block: 40px 56px; border-top: 1px solid var(--rule); color: var(--ink-2); font-size: 13.5px; }
.foot-grid { display: grid; gap: 24px; }
@media (min-width: 760px) { .foot-grid { grid-template-columns: 1.4fr 1fr 1fr 1fr; } }
.foot-grid h4 { font-family: var(--mono); font-size: 10.5px; letter-spacing: .12em; text-transform: uppercase; color: var(--faint); font-weight: 500; margin-bottom: 10px; }
.foot-grid ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; }
.foot-grid a { color: var(--ink-2); border: 0; }
.foot-grid a:hover { color: var(--ink); }
.foot-small { font-family: var(--mono); font-size: 11px; color: var(--faint); margin-top: 28px; line-height: 1.9; }

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