/* Copper Domains -- site stylesheet. No scripts, no external fonts, no images from other sites. */

/* IBM Plex Sans + Mono, self-hosted (SIL OFL 1.1, see fonts/LICENSE-IBM-Plex.txt). No external requests. */
@font-face { font-family: "Plex Sans"; font-style: normal; font-weight: 400; font-display: swap; src: url("/fonts/plex-sans-400.woff2") format("woff2"); }
@font-face { font-family: "Plex Sans"; font-style: normal; font-weight: 500; font-display: swap; src: url("/fonts/plex-sans-500.woff2") format("woff2"); }
@font-face { font-family: "Plex Sans"; font-style: normal; font-weight: 600; font-display: swap; src: url("/fonts/plex-sans-600.woff2") format("woff2"); }
@font-face { font-family: "Plex Mono"; font-style: normal; font-weight: 400; font-display: swap; src: url("/fonts/plex-mono-400.woff2") format("woff2"); }
@font-face { font-family: "Plex Mono"; font-style: normal; font-weight: 500; font-display: swap; src: url("/fonts/plex-mono-500.woff2") format("woff2"); }
@font-face { font-family: "Plex Mono"; font-style: normal; font-weight: 600; font-display: swap; src: url("/fonts/plex-mono-600.woff2") format("woff2"); }

:root {
  --bg: #f7f6f3;
  --bg-2: #ffffff;
  --bg-3: #efede8;
  --fg: #19191b;
  --fg-2: #4a4b50;
  --muted: #74767d;
  --rule: #e1dfd9;
  --rule-2: #cfccc4;
  --copper: #b5692c;
  --copper-2: #8f4f1f;
  --copper-soft: #f1dfcf;
  --ink: #1b1a19;        /* dark panel */
  --ink-fg: #f1efea;
  --ink-muted: #a39f97;
  --ink-rule: #34322f;
  --sans: "Plex Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: "Plex Mono", ui-monospace, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --radius: 8px;
  --max: 1080px;
  --gutter: max(24px, env(safe-area-inset-left, 0px));
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111214;
    --bg-2: #18191c;
    --bg-3: #1e2024;
    --fg: #ecebe8;
    --fg-2: #c3c1bc;
    --muted: #8f9198;
    --rule: #2a2c31;
    --rule-2: #3a3d43;
    --copper: #d48b4d;
    --copper-2: #e7a56f;
    --copper-soft: #3d2a1b;
    --ink: #0c0c0d;
    --ink-fg: #f1efea;
    --ink-muted: #9b9790;
    --ink-rule: #2b2a28;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 84px; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16.5px/1.6 var(--sans);
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; }
h1, h2, h3 { margin: 0; font-weight: 600; letter-spacing: -.015em; line-height: 1.15; text-wrap: balance; }
p { margin: 0; }
.wrap { max-width: var(--max); margin: 0 auto; padding-left: var(--gutter); padding-right: max(24px, env(safe-area-inset-right, 0px)); }

/* Header */
.top { position: sticky; top: 0; z-index: 10; background: color-mix(in srgb, var(--bg) 88%, transparent); backdrop-filter: saturate(140%) blur(10px); border-bottom: 1px solid var(--rule); }
.top .wrap { display: flex; align-items: center; justify-content: space-between; gap: 24px; height: 64px; }
.mark { display: inline-flex; align-items: center; gap: 11px; font-weight: 600; font-size: 16px; letter-spacing: .01em; text-decoration: none; }
.mark svg { width: 22px; height: 22px; flex: none; }
nav { display: flex; gap: 6px 26px; flex-wrap: wrap; font-size: 15px; }
nav a { text-decoration: none; color: var(--fg-2); padding: 6px 0; border-bottom: 2px solid transparent; }
nav a:hover, nav a[aria-current="page"] { color: var(--fg); border-bottom-color: var(--copper); }
nav .cta { color: var(--copper-2); font-weight: 600; }

/* Hero */
.hero { position: relative; padding-block: clamp(64px, 11vh, 128px) clamp(56px, 9vh, 104px); overflow: hidden; }
.hero::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background:
    radial-gradient(ellipse 60% 50% at 85% 15%, color-mix(in srgb, var(--copper) 14%, transparent), transparent 70%),
    repeating-linear-gradient(0deg, transparent 0 47px, color-mix(in srgb, var(--rule) 60%, transparent) 47px 48px),
    repeating-linear-gradient(90deg, transparent 0 47px, color-mix(in srgb, var(--rule) 60%, transparent) 47px 48px);
  mask-image: linear-gradient(180deg, rgba(0,0,0,.9), transparent 85%);
}
.hero .wrap { position: relative; display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr); gap: 48px 64px; align-items: center; }
.eyebrow { display: inline-flex; align-items: center; gap: 10px; margin-bottom: 20px; font-size: 12.5px; font-weight: 600; letter-spacing: .14em; text-transform: uppercase; color: var(--copper-2); }
.eyebrow::before { content: ""; width: 28px; height: 2px; background: var(--copper); }
.hero h1 { font-size: clamp(36px, 5.2vw, 60px); font-weight: 600; letter-spacing: -.025em; line-height: 1.05; }
.hero .sub { margin-top: 22px; font-size: clamp(18px, 1.6vw, 20px); color: var(--fg-2); max-width: 34em; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }
.btn { display: inline-flex; align-items: center; gap: 10px; padding: 13px 20px; border-radius: 6px; font-weight: 600; font-size: 15.5px; text-decoration: none; border: 1px solid transparent; line-height: 1.2; }
.btn-primary { background: var(--copper); color: #fff; }
.btn-primary:hover { background: var(--copper-2); }
.btn-ghost { border-color: var(--rule-2); color: var(--fg); background: transparent; }
.btn-ghost:hover { border-color: var(--fg-2); }
.btn code { font: 600 14.5px var(--mono); }

/* Record panel */
.record { background: var(--ink); color: var(--ink-fg); border-radius: 10px; padding: 24px 26px 22px; font: 14px/1.6 var(--mono); box-shadow: 0 30px 60px -30px rgba(0,0,0,.45); border: 1px solid var(--ink-rule); }
.record .hd { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 18px; padding-bottom: 14px; border-bottom: 1px solid var(--ink-rule); color: var(--ink-muted); font-size: 12px; letter-spacing: .1em; text-transform: uppercase; }
.record .hd b { color: var(--copper); font-weight: 600; }
.record dl { margin: 0; display: grid; grid-template-columns: max-content 1fr; column-gap: 24px; row-gap: 10px; }
.record dt { color: var(--ink-muted); text-transform: uppercase; letter-spacing: .08em; font-size: 11.5px; padding-top: 3px; }
.record dd { margin: 0; min-width: 0; overflow-wrap: anywhere; }
.record a { color: inherit; text-decoration: none; border-bottom: 1px solid color-mix(in srgb, var(--copper) 55%, transparent); }
.record a:hover { border-bottom-color: var(--copper); }
.record .ok { color: var(--copper); }

/* Sections */
section { padding-block: clamp(56px, 8vh, 96px); border-top: 1px solid var(--rule); }
.alt { background: var(--bg-3); }
.sec-hd { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 2fr); gap: 20px 64px; margin-bottom: 44px; align-items: start; }
.sec-hd h2 { font-size: clamp(26px, 3vw, 34px); }
.sec-hd .num { font: 600 13px var(--mono); color: var(--copper-2); letter-spacing: .08em; margin-bottom: 10px; display: block; }
.sec-hd p { color: var(--fg-2); font-size: 17.5px; max-width: 40em; }

.grid { display: grid; gap: 20px; grid-template-columns: repeat(3, minmax(0, 1fr)); }
.card { background: var(--bg-2); border: 1px solid var(--rule); border-radius: var(--radius); padding: 24px 24px 22px; min-width: 0; }
.card .k { font: 600 13px var(--mono); color: var(--copper-2); letter-spacing: .06em; margin-bottom: 14px; display: flex; align-items: center; gap: 10px; }
.card .k::after { content: ""; flex: 1; height: 1px; background: var(--rule); }
.card h3 { font-size: 19px; margin-bottom: 10px; }
.card p { color: var(--fg-2); font-size: 16px; }

/* Steps */
.steps { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 0; border: 1px solid var(--rule); border-radius: var(--radius); background: var(--bg-2); overflow: hidden; }
.step { padding: 26px 24px 24px; border-left: 1px solid var(--rule); min-width: 0; }
.step:first-child { border-left: 0; }
.step .n { font: 600 12px var(--mono); color: var(--copper-2); letter-spacing: .1em; margin-bottom: 16px; }
.step h3 { font-size: 18px; margin-bottom: 10px; }
.step p { color: var(--fg-2); font-size: 15.5px; }
.step .t { margin-top: 14px; font: 500 12.5px var(--mono); color: var(--muted); }

/* Two-column facts */
.cols { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px 48px; }
.list { list-style: none; margin: 0; padding: 0; display: grid; gap: 14px; }
.list li { position: relative; padding-left: 36px; color: var(--fg-2); font-size: 16.5px; }
.list li::before { content: ""; position: absolute; left: 0; top: 3px; width: 20px; height: 20px; border-radius: 50%; border: 1.5px solid var(--copper); background: linear-gradient(135deg, var(--copper) 50%, transparent 50%); opacity: .9; }
.list.no li::before { background: none; border-color: var(--rule-2); }
.list b { color: var(--fg); font-weight: 600; }
.cols h3 { font-size: 15px; letter-spacing: .1em; text-transform: uppercase; color: var(--muted); margin-bottom: 18px; font-weight: 600; }

/* Compare table */
.compare { border: 1px solid var(--rule); border-radius: var(--radius); background: var(--bg-2); overflow: hidden; }
.cr { display: grid; grid-template-columns: 150px 1fr 1fr; gap: 0 24px; padding: 15px 22px; border-top: 1px solid var(--rule); align-items: baseline; }
.cr:first-child { border-top: 0; }
.cr > div { min-width: 0; }
.ch { background: var(--bg-3); font: 600 12px/1.6 var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--muted); }
.ch [role="columnheader"]:nth-child(2) { color: var(--copper-2); }
.cr [role="rowheader"] { font: 600 12.5px/1.7 var(--mono); color: var(--copper-2); letter-spacing: .06em; text-transform: uppercase; }
.cr [role="cell"] { color: var(--fg-2); font-size: 16px; }
.cr [role="cell"]:nth-child(2) { color: var(--fg); font-weight: 500; }
.compare-note { margin-top: 18px; color: var(--muted); font-size: 15px; }
@media (max-width: 600px) {
  .cr { grid-template-columns: 1fr; gap: 4px; }
  .ch { display: none; }
  .cr [role="cell"]:nth-child(2)::before { content: "Us: "; color: var(--copper-2); font: 600 12px var(--mono); letter-spacing: .06em; }
  .cr [role="cell"]:nth-child(3)::before { content: "End user: "; color: var(--muted); font: 600 12px var(--mono); letter-spacing: .06em; }
}

/* FAQ */
.faq { display: grid; gap: 0; border-top: 1px solid var(--rule); }
.faq details { border-bottom: 1px solid var(--rule); }
.faq summary { cursor: pointer; list-style: none; padding: 20px 0; font-weight: 600; font-size: 17.5px; display: flex; justify-content: space-between; gap: 20px; align-items: baseline; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; font: 400 22px/1 var(--mono); color: var(--copper); flex: none; }
.faq details[open] summary::after { content: "–"; }
.faq .a { padding: 0 0 22px; color: var(--fg-2); max-width: 44em; }
.faq .a p + p { margin-top: 10px; }

/* Contact */
.contact { background: var(--ink); color: var(--ink-fg); border-top: 0; }
.contact .wrap { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 40px 64px; align-items: start; }
.contact h2 { font-size: clamp(28px, 3.4vw, 40px); }
.contact p { color: var(--ink-muted); font-size: 17.5px; margin-top: 18px; max-width: 30em; }
.contact .mail { display: inline-block; margin-top: 26px; font: 600 clamp(18px, 2.2vw, 24px)/1.3 var(--mono); color: var(--ink-fg); text-decoration: none; border-bottom: 2px solid var(--copper); padding-bottom: 4px; overflow-wrap: anywhere; }
.contact .mail:hover { color: var(--copper); }
.contact .who { margin-top: 10px; font-size: 14px; color: var(--ink-muted); }
.include { border: 1px solid var(--ink-rule); border-radius: var(--radius); padding: 22px 24px; background: color-mix(in srgb, var(--ink) 70%, #000 30%); }
.include h3 { font: 600 12px var(--mono); letter-spacing: .12em; text-transform: uppercase; color: var(--ink-muted); margin-bottom: 14px; }
.include ol { margin: 0; padding-left: 22px; display: grid; gap: 9px; color: var(--ink-fg); font-size: 16px; }
.include li::marker { color: var(--copper); font: 600 14px var(--mono); }
.include .note { margin-top: 16px; color: var(--ink-muted); font-size: 14px; }

/* Footer */
footer { background: var(--ink); color: var(--ink-muted); border-top: 1px solid var(--ink-rule); padding-block: 26px 28px; font-size: 13.5px; }
footer .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 10px 24px; }
footer a { color: inherit; text-decoration: none; }
footer a:hover { color: var(--ink-fg); }
footer .links { display: flex; flex-wrap: wrap; gap: 8px 22px; }

/* Inner pages */
.page-hd { padding-block: clamp(56px, 9vh, 96px) clamp(36px, 5vh, 56px); border-top: 0; }
.page-hd h1 { font-size: clamp(34px, 4.6vw, 52px); letter-spacing: -.025em; }
.page-hd .sub { margin-top: 18px; font-size: 19px; color: var(--fg-2); max-width: 36em; }
.prose > * { max-width: 44em; }
.prose h2 { font-size: 26px; margin: 48px 0 14px; }
.prose h2:first-child { margin-top: 0; }
.prose h3 { font-size: 19px; margin: 28px 0 8px; }
.prose p { color: var(--fg-2); margin: 0 0 14px; }
.prose ul { margin: 0 0 14px; padding-left: 22px; color: var(--fg-2); }
.prose li { margin-bottom: 6px; }
.prose li::marker { color: var(--copper); }
.prose .aside { border-left: 3px solid var(--copper); padding: 4px 0 4px 18px; margin: 20px 0 24px; color: var(--fg-2); }
.prose code { font: 500 .92em var(--mono); background: var(--bg-3); padding: 1px 6px; border-radius: 4px; }
.timeline { border: 1px solid var(--rule); border-radius: var(--radius); background: var(--bg-2); margin: 24px 0 32px; }
.timeline .row { display: grid; grid-template-columns: 150px 1fr; gap: 8px 24px; padding: 16px 22px; border-top: 1px solid var(--rule); }
.timeline .row:first-child { border-top: 0; }
.timeline .when { font: 600 12.5px/1.7 var(--mono); color: var(--copper-2); letter-spacing: .06em; text-transform: uppercase; }
.timeline .what { color: var(--fg-2); font-size: 16px; }
.timeline .what b { color: var(--fg); }

/* Responsive */
@media (max-width: 920px) {
  .grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .hero .wrap { grid-template-columns: 1fr; gap: 40px; }
  .steps { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .step:nth-child(3) { border-left: 0; }
  .step:nth-child(n+3) { border-top: 1px solid var(--rule); }
  .sec-hd { grid-template-columns: 1fr; gap: 14px; }
  .contact .wrap { grid-template-columns: 1fr; }
}
@media (max-width: 600px) {
  .grid { grid-template-columns: 1fr; }
  body { font-size: 16px; }
  .top .wrap { height: auto; padding-block: 12px; flex-wrap: wrap; gap: 8px 20px; }
  nav { gap: 2px 18px; font-size: 14px; }
  .steps { grid-template-columns: 1fr; }
  .step { border-left: 0; border-top: 1px solid var(--rule); }
  .step:first-child { border-top: 0; }
  .cols { grid-template-columns: 1fr; gap: 36px; }
  .record { padding: 20px 18px; }
  .record dl { grid-template-columns: 1fr; row-gap: 4px; }
  .record dt { margin-top: 10px; }
  .record dt:first-of-type { margin-top: 0; }
  .timeline .row { grid-template-columns: 1fr; gap: 4px; }
}
@media (prefers-reduced-motion: no-preference) {
  .btn, nav a, .record a { transition: all .15s ease; }
}