/* Sensor Lab — sensorlab.plutostudio.app
   Instrument-like counterpart to Debias: mono-forward, readout grids, spec
   tables. Same studio violet (sampled from the app's own artwork), different
   visual language — Debias reads as an essay, this reads as a panel. */

:root {
  --paper:      #FAFAFC;
  --paper-sunk: #F0F0F5;
  --ink:        #14131A;
  --ink-soft:   #3A3846;
  --muted:      #6A6779;
  --rule:       #E1E0EA;
  --violet:     #5226AE;
  --violet-dim: #EDE8FA;
  --signal:     #0B7285;
  --signal-dim: #DEF0F3;

  --sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto,
          "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas,
          "Liberation Mono", monospace;

  --col: 64ch;
  --wide: 74rem;
  --pad: clamp(1.25rem, 5vw, 2rem);
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper:      #101017;
    --paper-sunk: #191922;
    --ink:        #EEEDF5;
    --ink-soft:   #C4C2D2;
    --muted:      #8E8BA2;
    --rule:       #2A2938;
    --violet:     #A98CFF;
    --violet-dim: #221B39;
    --signal:     #4EC5D9;
    --signal-dim: #102A30;
  }
}

:root[data-theme="dark"] {
  --paper:      #101017;
  --paper-sunk: #191922;
  --ink:        #EEEDF5;
  --ink-soft:   #C4C2D2;
  --muted:      #8E8BA2;
  --rule:       #2A2938;
  --violet:     #A98CFF;
  --violet-dim: #221B39;
  --signal:     #4EC5D9;
  --signal-dim: #102A30;
}

:root[data-theme="light"] {
  --paper:      #FAFAFC;
  --paper-sunk: #F0F0F5;
  --ink:        #14131A;
  --ink-soft:   #3A3846;
  --muted:      #6A6779;
  --rule:       #E1E0EA;
  --violet:     #5226AE;
  --violet-dim: #EDE8FA;
  --signal:     #0B7285;
  --signal-dim: #DEF0F3;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--violet); }

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

.wrap {
  width: min(100% - 2 * var(--pad), var(--col));
  margin-inline: auto;
}

.wide {
  width: min(100% - 2 * var(--pad), var(--wide));
  margin-inline: auto;
}

/* ---------- masthead ---------- */

.masthead {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-block: 1.1rem;
  border-bottom: 1px solid var(--rule);
  position: sticky;
  top: 0;
  z-index: 20;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: saturate(1.4) blur(10px);
  -webkit-backdrop-filter: saturate(1.4) blur(10px);
}

@supports not (backdrop-filter: blur(10px)) {
  .masthead { background: var(--paper); }
}

.masthead-id { display: flex; align-items: baseline; gap: 0.7rem; min-width: 0; }

.wordmark {
  font-family: var(--mono);
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  text-decoration: none;
  color: var(--ink);
  white-space: nowrap;
}

.wordmark span { color: var(--violet); }

.tagline {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--muted);
}

.masthead-nav { display: flex; align-items: center; gap: 1.1rem; font-size: 0.85rem; }

.masthead-nav a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
  white-space: nowrap;
}

.masthead-nav a:hover { color: var(--ink); border-bottom-color: var(--violet); }

.nav-cta {
  padding: 0.42rem 0.95rem;
  border-radius: 999px;
  background: var(--violet);
  color: var(--paper) !important;
  font-weight: 500;
  border-bottom: 0 !important;
  transition: opacity 140ms ease, transform 140ms ease;
}

.nav-cta:hover { opacity: 0.9; transform: translateY(-1px); }

@media (max-width: 52rem) {
  .masthead-id { flex-direction: column; align-items: flex-start; gap: 0.1rem; }
  .tagline { font-size: 0.62rem; line-height: 1.4; }
}

@media (max-width: 23rem) { .tagline { display: none; } }

/* ---------- headings and blocks ---------- */

section { padding-block: clamp(2.25rem, 6vw, 3.5rem); }

h1 {
  font-size: clamp(1.9rem, 5.5vw, 2.9rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin: 0 0 0.85rem;
}

h2 {
  font-size: clamp(1.25rem, 3vw, 1.6rem);
  line-height: 1.25;
  letter-spacing: -0.01em;
  margin: 0 0 1rem;
}

h3 { font-size: 1.03rem; margin: 0 0 0.4rem; }

.sect-label {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 0.9rem;
}

.eyebrow {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--violet);
  margin-bottom: 1rem;
}

.hero { padding-block: clamp(2.75rem, 8vw, 4.5rem) 2rem; }

.answer {
  font-size: clamp(1.05rem, 2.4vw, 1.2rem);
  line-height: 1.55;
  color: var(--ink-soft);
  max-width: var(--col);
  margin: 0 0 1.5rem;
}

.prose p { color: var(--ink-soft); max-width: var(--col); }
.prose p + p { margin-top: 0.9rem; }

.crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 1.1rem;
}

.crumbs a { color: var(--muted); text-decoration: none; }
.crumbs a:hover { color: var(--violet); }
.crumbs span[aria-hidden] { opacity: 0.45; }

.tool-head { padding-block: clamp(1.75rem, 5vw, 3rem) 1.25rem; }

.group-pill {
  display: inline-block;
  padding: 0.28rem 0.7rem;
  margin-bottom: 0.9rem;
  border-radius: 999px;
  border: 1px solid color-mix(in srgb, var(--violet) 35%, transparent);
  background: var(--violet-dim);
  color: var(--violet);
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

/* ---------- spec table ---------- */

.table-scroll { overflow-x: auto; }

.spec {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}

.spec th, .spec td {
  text-align: left;
  vertical-align: top;
  padding: 0.85rem 1rem 0.85rem 0;
  border-top: 1px solid var(--rule);
}

.spec tr:last-child th, .spec tr:last-child td { border-bottom: 1px solid var(--rule); }

.spec th {
  width: 11rem;
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--muted);
  white-space: nowrap;
}

.spec td { color: var(--ink-soft); }

/* ---------- limits ---------- */

.slab { background: var(--paper-sunk); border-block: 1px solid var(--rule); }
.slab p { color: var(--ink-soft); max-width: var(--col); }
.slab p + p { margin-top: 0.9rem; }
.slab-link { margin-top: 1.4rem; font-family: var(--mono); font-size: 0.8rem; }
.slab-link a { text-decoration: none; border-bottom: 1px solid currentColor; }

.limits { list-style: none; padding: 0; margin: 0; max-width: var(--col); }

.limits li {
  position: relative;
  padding: 0 0 0 1.6rem;
  margin-bottom: 1rem;
  color: var(--ink-soft);
  font-size: 0.97rem;
}

.limits li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--signal);
  font-family: var(--mono);
}

/* ---------- FAQ ---------- */

.qa { padding: 1.1rem 0; border-top: 1px solid var(--rule); max-width: var(--col); }
.qa:last-of-type { border-bottom: 1px solid var(--rule); }
.qa p { margin: 0; color: var(--ink-soft); font-size: 0.97rem; }

/* ---------- tool grid ---------- */

.group { padding-block: clamp(1.75rem, 4vw, 2.5rem); }

.rule-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  padding-bottom: 0.7rem;
  margin-bottom: 1.35rem;
  border-bottom: 1px solid var(--rule);
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(15rem, 1fr));
  gap: 0.75rem;
}

.tool-card {
  display: grid;
  gap: 0.3rem;
  padding: 1.1rem 1.15rem;
  border: 1px solid var(--rule);
  border-radius: 12px;
  background: var(--paper);
  text-decoration: none;
  color: inherit;
  transition: border-color 0.14s ease, transform 0.14s ease;
}

.tool-card:hover { border-color: var(--violet); transform: translateY(-2px); }

.tool-name { font-weight: 600; font-size: 1rem; }

.tool-sensor {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--signal);
}

.tool-answer { color: var(--muted); font-size: 0.88rem; line-height: 1.5; }

/* ---------- related links ---------- */

.rel-links { display: flex; flex-wrap: wrap; gap: 0.45rem; }

.rel-links a {
  padding: 0.35rem 0.8rem;
  border: 1px solid var(--rule);
  border-radius: 999px;
  font-size: 0.88rem;
  color: var(--ink-soft);
  text-decoration: none;
}

.rel-links a:hover { border-color: var(--violet); color: var(--violet); }

/* ---------- CTA ---------- */

.cta { text-align: center; padding-block: clamp(2.75rem, 7vw, 4.5rem); }
.cta p { color: var(--muted); margin-bottom: 1.9rem; max-width: var(--col); margin-inline: auto; }

.install {
  display: inline-block;
  font-size: 1rem;
  font-weight: 500;
  padding: 0.9rem 2rem;
  background: var(--violet);
  color: var(--paper);
  text-decoration: none;
  border-radius: 999px;
  transition: opacity 140ms ease, transform 140ms ease;
}

.install:hover { opacity: 0.9; transform: translateY(-1px); }

.free {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  margin-top: 1.15rem;
}

.back { margin-top: 2rem; font-size: 0.9rem; }
.back a { color: var(--muted); text-decoration: none; }
.back a:hover { color: var(--violet); }

/* ---------- legal / support ---------- */

.doc { padding-block: clamp(2.25rem, 6vw, 3.5rem); }
.doc h1 { font-size: clamp(1.6rem, 4vw, 2.2rem); }
.doc h2 { font-size: 1.15rem; margin-top: 2rem; }
.doc p, .doc li { color: var(--ink-soft); }
.doc ul { padding-left: 1.2rem; margin: 0.7rem 0 0; }
.doc li { margin-bottom: 0.5rem; }

.updated {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 2rem;
}

/* ---------- footer ---------- */

footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
  padding-block: 2rem;
  margin-top: 1rem;
  border-top: 1px solid var(--rule);
  font-size: 0.85rem;
  color: var(--muted);
}

footer a { color: var(--muted); text-decoration: none; }
footer a:hover { color: var(--violet); }
.footer-links { display: flex; flex-wrap: wrap; gap: 1.1rem; }

@media (max-width: 34rem) {
  .spec th, .spec td { display: block; width: auto; padding-right: 0; }
  .spec th { border-bottom: 0; padding-bottom: 0.2rem; }
  .spec td { border-top: 0; padding-top: 0; }
  .spec tr { display: block; border-top: 1px solid var(--rule); padding-block: 0.7rem; }
  .spec tr:last-child { border-bottom: 1px solid var(--rule); }
}

/* Studio bar. Present on every page of every studio site, above the fold and
   before anything else, so the link back is never more than a glance away. It
   is a plain block rather than sticky on purpose: several of these pages are
   long and already carry their own headers, and a second fixed strip competing
   with those costs more than the link is worth. */
.studiobar {
  display: block;
  text-align: center;
  text-decoration: none;
  font-size: .76rem;
  letter-spacing: .05em;
  text-transform: uppercase;
  padding: .45rem 1rem;
  background: var(--paper-sunk);
  border-bottom: 1px solid var(--rule);
  color: var(--muted);
}
.studiobar b { color: var(--violet); font-weight: 600; letter-spacing: .03em; }
.studiobar:hover { color: var(--ink); }