/* LensSentry — technical field manual.
   Deliberately not dark-mode SaaS: warm paper ground, ink rules, vermilion
   signal. The product is the dark instrument; the site is the manual that
   documents it. Fonts are self-hosted — Google Fonts would hand visitor IPs
   to Google, which would make the privacy claims on this page a lie. */

@font-face {
  font-family: "Instrument Serif";
  src: url("/fonts/InstrumentSerif-Regular.ttf") format("truetype");
  font-weight: 400; font-display: swap;
}
@font-face {
  font-family: "Plex Sans";
  src: url("/fonts/IBMPlexSans-Regular.woff2") format("woff2");
  font-weight: 400; font-display: swap;
}
@font-face {
  font-family: "Plex Sans";
  src: url("/fonts/IBMPlexSans-SemiBold.woff2") format("woff2");
  font-weight: 600; font-display: swap;
}
@font-face {
  font-family: "Plex Mono";
  src: url("/fonts/IBMPlexMono-Regular.woff2") format("woff2");
  font-weight: 400; font-display: swap;
}
@font-face {
  font-family: "Plex Mono";
  src: url("/fonts/IBMPlexMono-Medium.woff2") format("woff2");
  font-weight: 500; font-display: swap;
}

:root {
  --paper: #efe9dc;
  --paper-2: #e7e0d0;
  --paper-3: #dfd6c2;
  --ink: #17140f;
  --ink-2: #57503f;
  --ink-3: #8a8171;
  --rule: #c4b9a1;
  --rule-soft: #d8cebb;

  --signal: #c3320c;      /* detected / alert */
  --signal-2: #a8730d;    /* possible */
  --signal-3: #1f5b3a;    /* clear */
  --status: var(--signal-3);

  --serif: "Instrument Serif", Georgia, "Times New Roman", serif;
  --sans: "Plex Sans", -apple-system, BlinkMacSystemFont, sans-serif;
  --mono: "Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

  --max: 74rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #14120e;
    --paper-2: #1b1813;
    --paper-3: #232019;
    --ink: #f0eadd;
    --ink-2: #b3aa96;
    --ink-3: #837a68;
    --rule: #3a3428;
    --rule-soft: #2a2620;
    --signal: #ef5a26;
    --signal-2: #d99a26;
    --signal-3: #4fae7d;
  }
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.55;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a { color: var(--ink); text-decoration: underline; text-underline-offset: 3px; text-decoration-thickness: 1px; }
a:hover { color: var(--signal); }

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 2rem; }
@media (max-width: 640px) { .wrap { padding: 0 1.25rem; } }

/* ---------- Masthead: a rule, not a floating blur ---------- */

.nav { border-bottom: 1.5px solid var(--ink); background: var(--paper); }
.nav-inner {
  max-width: var(--max); margin: 0 auto; padding: 0.85rem 2rem;
  display: flex; align-items: baseline; justify-content: space-between; gap: 1.5rem;
}
@media (max-width: 640px) { .nav-inner { padding: 0.8rem 1.25rem; } }
.brand {
  font-family: var(--mono); font-weight: 500;
  font-size: 0.8rem; letter-spacing: 0.22em; text-transform: uppercase;
  color: var(--ink); text-decoration: none;
}
.brand em { font-style: normal; color: var(--signal); }
.nav-links { display: flex; gap: 1.6rem; }
.nav-links a {
  font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--ink-2); text-decoration: none;
}
.nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--signal); }
@media (max-width: 560px) { .nav-links a.hide-sm { display: none; } .nav-links { gap: 1.1rem; } }

/* ---------- Sections numbered like a spec sheet ---------- */

section { border-bottom: 1px solid var(--rule); padding: 4.5rem 0; }
section.hero { padding: 3rem 0 4rem; }
section:last-of-type { border-bottom: 0; }

.sec-head { display: grid; grid-template-columns: 6rem 1fr; gap: 1.5rem; align-items: start; }
@media (max-width: 720px) { .sec-head { grid-template-columns: 1fr; gap: 0.5rem; } }
.sec-num {
  font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.14em;
  color: var(--signal); padding-top: 0.7rem; text-transform: uppercase;
}
.sec-title { font-family: var(--serif); font-size: clamp(1.9rem, 4vw, 3rem); line-height: 1.02; letter-spacing: -0.01em; font-weight: 400; }
.sec-note { color: var(--ink-2); max-width: 40rem; margin-top: 1rem; font-size: 0.98rem; }

/* ---------- Hero: asymmetric, left-aligned, editorial ---------- */

.hero-grid { display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 3rem; align-items: start; }
@media (max-width: 900px) { .hero-grid { grid-template-columns: 1fr; gap: 2.5rem; } }

.kicker {
  font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--ink-2);
  border-top: 1.5px solid var(--ink); padding-top: 0.6rem; display: block; margin-bottom: 1.6rem;
}
h1 {
  font-family: var(--serif); font-weight: 400;
  font-size: clamp(2.8rem, 7.4vw, 5.4rem);
  line-height: 0.96; letter-spacing: -0.015em;
  margin-bottom: 1.4rem;
}
h1 .em { color: var(--signal); font-style: italic; }
.lede { font-size: 1.05rem; color: var(--ink-2); max-width: 33rem; }
.lede + .lede { margin-top: 0.9rem; }

/* ---------- Radar as a schematic, not a glow ---------- */

.figure { border: 1.5px solid var(--ink); background: var(--paper-2); }
.figure-head {
  display: flex; justify-content: space-between; align-items: center;
  border-bottom: 1px solid var(--rule); padding: 0.5rem 0.8rem;
  font-family: var(--mono); font-size: 0.66rem; letter-spacing: 0.13em; text-transform: uppercase; color: var(--ink-2);
}
.figure-body { padding: 1.6rem 1rem 1.2rem; display: grid; place-items: center; }

.radar-stage { --status: var(--signal-3); width: 100%; }
.radar-stage[data-state="possible"] { --status: var(--signal-2); }
.radar-stage[data-state="detected"] { --status: var(--signal); }
.radar-stage[data-state="idle"] { --status: var(--ink-3); }

.radar { position: relative; width: min(300px, 68vw); aspect-ratio: 1; margin: 0 auto; display: grid; place-items: center; }
.radar > * { position: absolute; border-radius: 50%; }
.radar-ring { border: 1px solid var(--rule); }
.radar-ring.r1 { inset: 38%; }
.radar-ring.r2 { inset: 26%; }
.radar-ring.r3 { inset: 14%; }
.radar-ring.r4 { inset: 2%; border-color: var(--ink); border-width: 1.5px; }
.radar-glow { inset: 2%; background: radial-gradient(circle, color-mix(in srgb, var(--status) 16%, transparent), transparent 70%); }
.radar-sweep {
  inset: 2%;
  background: conic-gradient(from 0deg, color-mix(in srgb, var(--status) 30%, transparent) 0deg, transparent 76deg, transparent 360deg);
  animation: sweep 5s linear infinite;
}
.radar-stage[data-state="idle"] .radar-sweep { display: none; }
.radar-core { width: 13%; height: 13%; background: var(--status); }
.radar-core-ring { width: 22%; height: 22%; border: 1px solid var(--status); }
.radar-tick { width: 5%; height: 1.5px; background: var(--ink-3); border-radius: 0; }
.radar-tick.t0 { transform: translateX(min(132px, 30vw)); }
.radar-tick.t1 { transform: rotate(90deg) translateX(min(132px, 30vw)); }
.radar-tick.t2 { transform: rotate(180deg) translateX(min(132px, 30vw)); }
.radar-tick.t3 { transform: rotate(270deg) translateX(min(132px, 30vw)); }
@keyframes sweep { to { transform: rotate(360deg); } }

.readout { border-top: 1px solid var(--rule); margin-top: 1.2rem; padding-top: 0.9rem; width: 100%; }
.readout-row { display: flex; justify-content: space-between; gap: 1rem; font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--ink-3); }
.readout-val { color: var(--status); font-weight: 500; }
.readout-note { font-size: 0.82rem; color: var(--ink-2); margin-top: 0.6rem; min-height: 3.2rem; }

/* ---------- Spec list: rules, not cards ---------- */

.spec { margin-top: 2.5rem; border-top: 1.5px solid var(--ink); }
.spec-row { display: grid; grid-template-columns: 6rem 1fr 1.35fr; gap: 1.5rem; padding: 1.15rem 0; border-bottom: 1px solid var(--rule-soft); align-items: baseline; }
@media (max-width: 760px) { .spec-row { grid-template-columns: 1fr; gap: 0.35rem; padding: 1rem 0; } }
.spec-idx { font-family: var(--mono); font-size: 0.72rem; color: var(--ink-3); letter-spacing: 0.1em; }
.spec-key { font-weight: 600; font-size: 1rem; }
.spec-key .tag { font-family: var(--mono); font-size: 0.66rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--signal); margin-left: 0.5rem; }
.spec-val { color: var(--ink-2); font-size: 0.95rem; }

/* ---------- Steps ---------- */

.steps { margin-top: 2.5rem; display: grid; gap: 0; border-top: 1.5px solid var(--ink); }
.step { display: grid; grid-template-columns: 6rem 1fr; gap: 1.5rem; padding: 1.4rem 0; border-bottom: 1px solid var(--rule-soft); }
@media (max-width: 720px) { .step { grid-template-columns: 1fr; gap: 0.4rem; } }
.step-num { font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.14em; color: var(--signal); }
.step p { color: var(--ink-2); max-width: 44rem; }
.step strong { color: var(--ink); font-weight: 600; }

/* ---------- The two truths: the brand's centrepiece ---------- */

.truths { margin-top: 2.5rem; display: grid; grid-template-columns: 1fr 1fr; border: 1.5px solid var(--ink); }
@media (max-width: 700px) { .truths { grid-template-columns: 1fr; } }
.truth { padding: 1.6rem; }
.truth + .truth { border-left: 1px solid var(--rule); }
@media (max-width: 700px) { .truth + .truth { border-left: 0; border-top: 1px solid var(--rule); } }
.truth-k { font-family: var(--mono); font-size: 0.68rem; letter-spacing: 0.15em; text-transform: uppercase; color: var(--signal); display: block; margin-bottom: 0.7rem; }
.truth p { font-family: var(--serif); font-size: 1.42rem; line-height: 1.2; }

/* ---------- Forms ---------- */

.capture { display: grid; gap: 0.6rem; max-width: 27rem; margin-top: 2rem; }
.capture input[type="email"], .capture input[type="text"], .capture select, .capture textarea {
  font-family: var(--mono); font-size: 0.86rem;
  width: 100%; padding: 0.75rem 0.85rem;
  color: var(--ink); background: var(--paper);
  border: 1.5px solid var(--ink); border-radius: 0;
}
.capture input::placeholder, .capture textarea::placeholder { color: var(--ink-3); }
.capture input:focus, .capture select:focus, .capture textarea:focus { outline: 2px solid var(--signal); outline-offset: -1px; }
.capture label.check { display: flex; gap: 0.55rem; align-items: flex-start; font-size: 0.85rem; color: var(--ink-2); cursor: pointer; }
.capture label.check input { margin-top: 0.25rem; accent-color: var(--signal); }
.btn {
  font-family: var(--mono); font-size: 0.78rem; letter-spacing: 0.13em; text-transform: uppercase; font-weight: 500;
  border: 1.5px solid var(--ink); border-radius: 0; cursor: pointer;
  padding: 0.8rem 1.1rem; background: var(--ink); color: var(--paper);
  transition: background 0.15s, color 0.15s;
}
.btn:hover { background: var(--signal); border-color: var(--signal); color: #fff; }
.btn:disabled { opacity: 0.5; cursor: default; }
.formnote { font-family: var(--mono); font-size: 0.68rem; color: var(--ink-3); line-height: 1.5; }
.msg { font-family: var(--mono); font-size: 0.76rem; min-height: 1.2rem; }
.msg.ok { color: var(--signal-3); }
.msg.err { color: var(--signal); }

/* ---------- Fact table (press) ---------- */

.fact { border-collapse: collapse; width: 100%; margin-top: 2.5rem; border-top: 1.5px solid var(--ink); }
.fact td { border-bottom: 1px solid var(--rule-soft); padding: 1rem 0.6rem 1rem 0; vertical-align: top; font-size: 0.95rem; color: var(--ink-2); }
.fact td:first-child { width: 12rem; font-family: var(--mono); font-size: 0.68rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink-3); }

/* ---------- Prose ---------- */

.prose { max-width: 42rem; margin-top: 2rem; }
.prose h2 { font-family: var(--mono); font-size: 0.74rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--signal); margin-top: 2.4rem; font-weight: 500; }
.prose p { color: var(--ink-2); margin-top: 0.7rem; }
.prose strong { color: var(--ink); font-weight: 600; }
.prose .effective { font-family: var(--mono); font-size: 0.72rem; color: var(--ink-3); letter-spacing: 0.08em; }

/* ---------- Footer ---------- */

.foot { border-top: 1.5px solid var(--ink); padding: 2rem 0 3rem; }
.foot-inner {
  max-width: var(--max); margin: 0 auto; padding: 0 2rem;
  display: flex; flex-wrap: wrap; gap: 0.6rem 2rem;
  font-family: var(--mono); font-size: 0.7rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-3);
}
@media (max-width: 640px) { .foot-inner { padding: 0 1.25rem; } }
.foot-inner a { color: var(--ink-2); text-decoration: none; }
.foot-inner a:hover { color: var(--signal); }

/* ---------- Reveal ---------- */

.reveal { opacity: 0; transform: translateY(10px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .radar-sweep { animation: none; }
}