/* RehabSoft product site (D162). Paper, ink, one accent; square corners; hairline rules; numbered mono labels.
   Hand-written; the pages are built by tools/landing/build.py. Light and dark: system choice, or the toggle (data-theme on <html>). */
:root {
  --bg: #f2f1ee; --bg-raised: #faf9f7; --bg-sunken: #e9e8e4;
  --ink: #101014; --ink-strong: #000; --muted: rgba(16, 16, 20, .64); --faint: rgba(16, 16, 20, .44);
  --line: rgba(16, 16, 20, .14); --line-strong: rgba(16, 16, 20, .38);
  --accent: #0d7a70; --accent-ink: #0a5f57; --accent-soft: #dcefeb;
  --invert-bg: #101014; --invert-fg: #f2f1ee;
  --scan: rgba(16, 16, 20, .028);
  --font-display: "Archivo", system-ui, sans-serif;
  --font-serif: "Instrument Serif", Georgia, serif;
  --font-sans: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "Geist Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
  --wrap: 1240px; --gutter: 24px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #121316; --bg-raised: #17181c; --bg-sunken: #0b0b0d;
    --ink: #f2f1ee; --ink-strong: #fff; --muted: rgba(242, 241, 238, .66); --faint: rgba(242, 241, 238, .44);
    --line: rgba(242, 241, 238, .15); --line-strong: rgba(242, 241, 238, .4);
    --accent: #34b6a7; --accent-ink: #5fd0c2; --accent-soft: #15302d;
    --invert-bg: #f2f1ee; --invert-fg: #0b0b0c; --scan: rgba(255, 255, 255, .025);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #121316; --bg-raised: #17181c; --bg-sunken: #0b0b0d;
  --ink: #f2f1ee; --ink-strong: #fff; --muted: rgba(242, 241, 238, .66); --faint: rgba(242, 241, 238, .44);
  --line: rgba(242, 241, 238, .15); --line-strong: rgba(242, 241, 238, .4);
  --accent: #34b6a7; --accent-ink: #5fd0c2; --accent-soft: #15302d;
  --invert-bg: #f2f1ee; --invert-fg: #0b0b0c; --scan: rgba(255, 255, 255, .025);
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: 72px; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 400 16px/1.6 var(--font-sans); -webkit-font-smoothing: antialiased; overflow-x: hidden; }
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.wrap { width: 100%; max-width: var(--wrap); margin: 0 auto; padding: 0 var(--gutter); }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip { position: absolute; left: 8px; top: -60px; z-index: 100; background: var(--invert-bg); color: var(--invert-fg); padding: 8px 12px; font: 600 12px var(--font-mono); text-transform: uppercase; letter-spacing: .12em; }
.skip:focus { top: 8px; }

/* type */
.hud { font: 500 11px/1.4 var(--font-mono); letter-spacing: .15em; text-transform: uppercase; color: var(--muted); }
.hud b { color: var(--ink); font-weight: 600; }
.display { font-family: var(--font-display); font-weight: 620; font-stretch: 118%; letter-spacing: -.03em; line-height: 1.04; color: var(--ink-strong); margin: 0; }
.display em, .serif { font-family: var(--font-serif); font-style: italic; font-weight: 400; font-stretch: 100%; letter-spacing: -.01em; color: var(--muted); }
h1.display { font-size: clamp(40px, 7vw, 88px); }
h2.display { font-size: clamp(32px, 4.6vw, 60px); }
h3 { font: 600 19px/1.3 var(--font-sans); letter-spacing: -.01em; margin: 0 0 8px; color: var(--ink-strong); }
.lead { font-size: clamp(17px, 1.6vw, 20px); line-height: 1.55; color: var(--muted); max-width: 640px; margin: 20px 0 0; }
p { margin: 0 0 12px; }
.muted { color: var(--muted); }

/* buttons: square, mono, uppercase */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 10px; min-height: 44px; padding: 12px 20px; border: 1px solid var(--line-strong); background: transparent; color: var(--ink);
  font: 700 12px/1 var(--font-mono); letter-spacing: .12em; text-transform: uppercase; text-decoration: none; cursor: pointer; border-radius: 0; transition: background .15s, color .15s, opacity .15s; white-space: nowrap; }
.btn:hover { background: var(--invert-bg); color: var(--invert-fg); border-color: var(--invert-bg); }
.btn.primary { background: var(--invert-bg); color: var(--invert-fg); border-color: var(--invert-bg); }
.btn.primary:hover { opacity: .86; }
.btn.accent { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.accent:hover { opacity: .88; }
.btn svg { width: 16px; height: 16px; flex: none; }
.btn-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }
.arrow::after { content: "\2192"; font-family: var(--font-sans); font-weight: 400; letter-spacing: 0; }

/* header */
.top { position: sticky; top: 0; z-index: 50; background: color-mix(in srgb, var(--bg) 92%, transparent); backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px); border-bottom: 1px solid var(--line); }
.top-in { display: flex; align-items: stretch; justify-content: space-between; height: 56px; max-width: none; padding: 0; }
.logo { display: flex; align-items: center; gap: 10px; padding: 0 20px; border-right: 1px solid var(--line); text-decoration: none; color: var(--ink-strong); font: 700 17px/1 var(--font-display); font-stretch: 112%; letter-spacing: -.02em; }
.logo-mark { display: grid; place-items: center; width: 30px; height: 30px; background: var(--accent); color: #fff; }
.logo-mark svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.nav { display: flex; align-items: stretch; }
.nav a, .nav button.navbtn { display: flex; align-items: center; padding: 0 14px; text-decoration: none; color: var(--muted); font: 500 11px/1 var(--font-mono); letter-spacing: .15em; text-transform: uppercase; background: none; border: 0; cursor: pointer; }
.nav a:hover, .nav a[aria-current="page"], .nav button.navbtn:hover { color: var(--ink); }
.nav a[aria-current="page"] span, .nav a:hover span { background: var(--invert-bg); color: var(--invert-fg); }
.nav a span { padding: 4px 6px; }
.top-right { display: flex; align-items: stretch; }
.icon-btn { display: grid; place-items: center; width: 56px; border: 0; border-left: 1px solid var(--line); background: none; color: var(--muted); cursor: pointer; }
.icon-btn:hover { background: var(--invert-bg); color: var(--invert-fg); }
.icon-btn svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.top .signin { display: flex; align-items: center; padding: 0 22px; border: 0; border-left: 1px solid var(--line); background: var(--invert-bg); color: var(--invert-fg); font: 700 11px/1 var(--font-mono); letter-spacing: .14em; text-transform: uppercase; cursor: pointer; }
.top .signin:hover { opacity: .86; }
.menu-btn { display: none; }
.theme-dark-icon { display: none; }
:root[data-theme="dark"] .theme-dark-icon { display: block; } :root[data-theme="dark"] .theme-light-icon { display: none; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .theme-dark-icon { display: block; } :root:not([data-theme="light"]) .theme-light-icon { display: none; } }
@media (max-width: 960px) {
  .nav { display: none; }
  .menu-btn { display: grid; }
  .nav.open { display: flex; flex-direction: column; position: absolute; top: 56px; left: 0; right: 0; background: var(--bg); border-bottom: 1px solid var(--line); }
  .nav.open a, .nav.open button.navbtn { padding: 16px 20px; border-top: 1px solid var(--line); min-height: 52px; }
}
@media (max-width: 520px) { .top .signin { padding: 0 14px; } .logo { padding: 0 14px; } .icon-btn { width: 48px; } }

/* sections */
section.band { border-bottom: 1px solid var(--line); padding: clamp(64px, 9vw, 120px) 0; position: relative; }
.band-head { display: grid; grid-template-columns: minmax(0, 1fr); gap: 16px; margin-bottom: clamp(36px, 5vw, 64px); max-width: 860px; }
.label { display: flex; align-items: center; gap: 12px; }
.label::before { content: ""; width: 8px; height: 8px; background: var(--accent); }

/* hero */
.hero { padding: clamp(56px, 8vw, 104px) 0 0; border-bottom: 1px solid var(--line); background-image: repeating-linear-gradient(0deg, var(--scan) 0 1px, transparent 1px 4px); overflow: hidden; }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1fr); gap: 24px; }
.hero-meta { display: flex; flex-wrap: wrap; gap: 8px 24px; margin-top: 28px; }
.hero-meta span::before { content: "+ "; color: var(--accent); }
.hero-shot { margin-top: clamp(48px, 6vw, 72px); }
.window { border: 1px solid var(--line-strong); background: var(--bg-raised); box-shadow: 0 30px 80px -40px rgba(0, 0, 0, .35); }
.window-bar { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 9px 14px; border-bottom: 1px solid var(--line); }
.window-bar > span { min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.window-bar > span:first-child { flex: none; }
@media (max-width: 640px) { .window-bar > span:nth-child(3) { display: none; } }
.window-bar i { display: inline-block; width: 8px; height: 8px; border: 1px solid var(--line-strong); margin-right: 6px; }
.window img { width: 100%; }
.hero .window { border-bottom: 0; }

/* ticker */
.ticker { border-bottom: 1px solid var(--line); overflow: hidden; white-space: nowrap; padding: 14px 0; }
.ticker-track { display: inline-flex; gap: 40px; padding-right: 40px; animation: tick 60s linear infinite; }
.ticker-track span { display: inline-flex; align-items: center; gap: 40px; }
.ticker-track span::after { content: "/"; color: var(--faint); }
@keyframes tick { to { transform: translateX(-50%); } }
@media (prefers-reduced-motion: reduce) { .ticker-track { animation: none; } }

/* feature cards: a grid drawn with hairlines */
.cells { display: grid; gap: 1px; background: var(--line); border: 1px solid var(--line); }
.cells > * { background: var(--bg); min-width: 0; }
.cells-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.cells-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.cells-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
@media (max-width: 960px) { .cells-3, .cells-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 640px) { .cells-2, .cells-3, .cells-4 { grid-template-columns: minmax(0, 1fr); } }
.feature { display: flex; flex-direction: column; padding: 28px; gap: 6px; }
.feature .num { display: flex; justify-content: space-between; margin-bottom: 14px; }
.feature p { color: var(--muted); font-size: 15px; }
.feature .shot { margin: 18px -28px -28px; border-top: 1px solid var(--line); background: var(--bg-sunken); overflow: hidden; aspect-ratio: 16 / 10; }
.feature .shot img { width: 100%; height: 100%; object-fit: cover; object-position: left top; transition: transform .5s; }
.feature:hover .shot img { transform: scale(1.02); }
.feature.wide { grid-column: span 2; }
@media (max-width: 640px) { .feature.wide { grid-column: auto; } }
.feature ul, .cell ul { margin: 6px 0 0; padding: 0; list-style: none; }
.feature li, .cell li { position: relative; padding: 5px 0 5px 18px; font-size: 15px; color: var(--muted); border-top: 1px dashed var(--line); }
.feature li::before, .cell li::before { content: ""; position: absolute; left: 0; top: 14px; width: 6px; height: 6px; background: var(--accent); }
.cell { padding: 28px; }
a.cell { display: block; text-decoration: none; }
a.cell:hover { background: var(--bg-raised); }
.cell .btn { margin-top: 12px; }
.label + .display { margin-top: 16px; }
.band-head .label + .display { margin-top: 0; }
.cell p { color: var(--muted); font-size: 15px; }
.cell .hud { display: block; margin-bottom: 14px; }
.tag { display: inline-block; padding: 3px 8px; border: 1px solid var(--line-strong); font: 500 10px/1.4 var(--font-mono); letter-spacing: .14em; text-transform: uppercase; color: var(--muted); }
.tag.accent { border-color: var(--accent); color: var(--accent-ink); background: var(--accent-soft); }

/* roles */
.roles .cell h3 { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; }

/* split: text + image */
.split { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: clamp(32px, 5vw, 72px); align-items: center; }
.split.rev { grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); }
.split.rev > :first-child { order: 2; }
@media (max-width: 960px) { .split, .split.rev { grid-template-columns: minmax(0, 1fr); } .split.rev > :first-child { order: 0; } }
.phone { max-width: 300px; margin: 0 auto; border: 1px solid var(--line-strong); background: var(--bg-raised); padding: 10px; box-shadow: 0 30px 80px -40px rgba(0, 0, 0, .35); }

/* modules list */
.modules { counter-reset: mod; }
.module { display: grid; grid-template-columns: 56px minmax(0, 1fr); gap: 4px 12px; padding: 20px 24px; }
.module::before { counter-increment: mod; content: counter(mod, decimal-leading-zero); grid-row: span 2; font: 500 12px/1.6 var(--font-mono); color: var(--accent); letter-spacing: .1em; }
.module b { font-weight: 600; color: var(--ink-strong); }
.module span { color: var(--muted); font-size: 14px; }

/* call to action */
.cta { text-align: left; }
.cta .display { max-width: 900px; }
.signin-inline { display: flex; flex-wrap: wrap; align-items: stretch; gap: 0; margin-top: 32px; max-width: 560px; border: 1px solid var(--line-strong); }
.signin-inline label { flex: 1 1 260px; display: flex; align-items: center; min-height: 52px; padding: 0 0 0 14px; gap: 2px; background: var(--bg-raised); }
.signin-inline input { flex: 1; min-width: 60px; border: 0; background: transparent; color: var(--ink); font: 500 16px var(--font-mono); padding: 14px 0; outline: none; text-align: right; }
.signin-inline .suffix { font: 500 15px var(--font-mono); color: var(--muted); padding-right: 14px; white-space: nowrap; }
.signin-inline .btn { border: 0; min-height: 52px; flex: 0 0 auto; }
.signin-inline label { min-width: 0; }
.signin-inline input { min-width: 0; }
@media (max-width: 520px) {
  .signin-inline label { flex-basis: 100%; }
  .signin-inline .suffix { font-size: 13px; }
  .signin-inline .btn { flex: 1 1 100%; border-top: 1px solid var(--line-strong); }
}
.signin-inline:focus-within { outline: 2px solid var(--accent); outline-offset: 2px; }
.form-note { margin-top: 10px; font-size: 14px; color: var(--muted); }
.form-note.bad { color: #b3261e; }

/* footer */
.top-left { display: flex; align-items: stretch; min-width: 0; }
.foot .logo { padding: 0; border: 0; }
.foot-tag { margin-top: 16px; max-width: 340px; }
.dlg-close { border: 0; width: 44px; height: 44px; }
.dlg-body > p:first-child { margin: 0; }
.foot { padding: 56px 0 32px; }
.foot-grid { display: grid; grid-template-columns: minmax(0, 2fr) repeat(3, minmax(0, 1fr)); gap: 32px; }
@media (max-width: 760px) { .foot-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } .foot-grid > :first-child { grid-column: 1 / -1; } }
.foot h4 { margin: 0 0 14px; }
.foot ul { list-style: none; margin: 0; padding: 0; }
.foot li { margin: 0 0 8px; }
.foot a { color: var(--muted); text-decoration: none; font-size: 15px; }
.foot a:hover { color: var(--ink); text-decoration: underline; }
.foot-base { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; margin-top: 48px; padding-top: 20px; border-top: 1px solid var(--line); }

/* dialog: sign in */
dialog { border: 1px solid var(--line-strong); background: var(--bg); color: var(--ink); padding: 0; width: min(520px, calc(100vw - 32px)); border-radius: 0; }
dialog::backdrop { background: rgba(10, 10, 12, .55); backdrop-filter: blur(2px); }
.dlg-head { display: flex; justify-content: space-between; align-items: center; padding: 12px 12px 12px 20px; border-bottom: 1px solid var(--line); }
.dlg-body { padding: 24px 20px 20px; }
.dlg-body .signin-inline { margin-top: 18px; }

/* documentation pages (manual, tutorials) */
.doc { display: grid; grid-template-columns: 240px minmax(0, 1fr) 200px; gap: 48px; padding-top: 40px; padding-bottom: 96px; align-items: start; }
@media (max-width: 1199px) { .doc { grid-template-columns: 220px minmax(0, 1fr); } .toc { display: none; } }
@media (max-width: 960px) { .doc { grid-template-columns: minmax(0, 1fr); gap: 24px; padding-top: 24px; } }
.side { position: sticky; top: 80px; }
.side nav a { display: block; padding: 8px 12px; border-left: 1px solid var(--line); text-decoration: none; color: var(--muted); font-size: 15px; }
.side nav a:hover { color: var(--ink); border-left-color: var(--line-strong); }
.side nav a[aria-current="page"] { color: var(--ink-strong); border-left: 2px solid var(--accent); font-weight: 600; padding-left: 11px; }
.side .hud { display: block; margin: 0 0 10px; }
.side details summary { list-style: none; pointer-events: none; margin: 0 0 10px; }
.side details summary::-webkit-details-marker { display: none; }
@media (max-width: 960px) {
  .side { position: static; border: 1px solid var(--line); }
  .side details summary { display: flex; justify-content: space-between; align-items: center; padding: 14px 16px; margin: 0; cursor: pointer; pointer-events: auto; }
  .side details summary { position: relative; display: block; }
  .side details summary::after { content: "+"; position: absolute; right: 16px; top: 50%; transform: translateY(-50%); font: 400 20px/1 var(--font-mono); }
  .side details[open] summary::after { content: "\2212"; }
  .side details nav { padding: 0 16px 14px; }
}
.toc { position: sticky; top: 80px; font-size: 14px; }
.toc .hud { display: block; margin-bottom: 10px; }
.toc a { display: block; padding: 4px 0; color: var(--muted); text-decoration: none; }
.toc a:hover, .toc a.on { color: var(--ink); }
.prose { max-width: 760px; min-width: 0; }
.prose .crumbs { margin-bottom: 18px; }
.prose .crumbs a { text-decoration: none; color: var(--muted); }
.prose .crumbs a:hover { color: var(--ink); }
.prose h1 { font-size: clamp(34px, 5vw, 54px); margin-bottom: 8px; }
.prose > .lead { margin-bottom: 36px; }
.prose h2 { font: 600 clamp(24px, 2.6vw, 30px)/1.2 var(--font-display); font-stretch: 112%; letter-spacing: -.02em; margin: 56px 0 14px; padding-top: 22px; border-top: 1px solid var(--line); color: var(--ink-strong); }
.prose h3 { margin: 32px 0 10px; }
.prose p, .prose li { font-size: 16.5px; line-height: 1.7; }
.prose ul, .prose ol { padding-left: 22px; margin: 0 0 16px; }
.prose li { margin: 4px 0; }
.prose li::marker { color: var(--accent); }
.prose a { color: var(--accent-ink); text-underline-offset: 3px; }
.prose code, .prose kbd { font: 500 .9em var(--font-mono); background: var(--bg-sunken); padding: 1px 6px; border: 1px solid var(--line); }
.prose b, .prose strong { color: var(--ink-strong); font-weight: 600; }
.prose .ui { font-weight: 600; color: var(--ink-strong); background: var(--accent-soft); padding: 0 5px; }
.prose figure { margin: 24px 0 28px; }
.prose figure .window { box-shadow: none; }
.prose figcaption { margin-top: 10px; }
.prose table { width: 100%; border-collapse: collapse; margin: 16px 0 24px; font-size: 15px; display: block; overflow-x: auto; }
.prose th, .prose td { text-align: left; vertical-align: top; padding: 10px 12px; border-bottom: 1px solid var(--line); }
.prose th { font: 500 11px/1.4 var(--font-mono); letter-spacing: .12em; text-transform: uppercase; color: var(--muted); border-bottom-color: var(--line-strong); }
.note { border: 1px solid var(--line); border-left: 3px solid var(--accent); background: var(--bg-raised); padding: 14px 18px; margin: 20px 0; }
.note p:last-child { margin: 0; }
.note .hud { display: block; margin-bottom: 6px; color: var(--accent-ink); }
.steps { counter-reset: step; list-style: none; padding: 0 !important; }
.steps > li { counter-increment: step; position: relative; padding: 18px 0 18px 64px; border-top: 1px solid var(--line); margin: 0; }
.steps > li::before { content: counter(step, decimal-leading-zero); position: absolute; left: 0; top: 18px; width: 44px; height: 32px; display: grid; place-items: center; border: 1px solid var(--line-strong); font: 600 13px/1 var(--font-mono); color: var(--accent-ink); }
.steps > li > p:last-child { margin-bottom: 0; }
.pager { display: grid; grid-template-columns: 1fr 1fr; gap: 1px; background: var(--line); border: 1px solid var(--line); margin-top: 64px; }
.pager a { background: var(--bg); padding: 18px 20px; text-decoration: none; display: flex; flex-direction: column; gap: 4px; }
.pager a:hover { background: var(--bg-raised); }
.pager a.next { text-align: right; grid-column: 2; }
.pager b { font-weight: 600; }
.tut-list { display: grid; gap: 1px; background: var(--line); border: 1px solid var(--line); }
.tut-list a { display: grid; grid-template-columns: 64px minmax(0, 1fr) auto; gap: 16px; align-items: center; padding: 20px; background: var(--bg); text-decoration: none; }
.tut-list a:hover { background: var(--bg-raised); }
.tut-list .n { font: 600 13px var(--font-mono); color: var(--accent-ink); letter-spacing: .1em; }
.tut-list b { display: block; font-weight: 600; color: var(--ink-strong); }
.tut-list span.d { color: var(--muted); font-size: 15px; }
@media (max-width: 640px) { .tut-list a { grid-template-columns: 40px minmax(0, 1fr); } .tut-list .tag { display: none; } }

/* 404 */
.lost { min-height: 60vh; display: grid; align-content: center; gap: 12px; padding: 96px 0; }