/* ============================================================
   Offline AI Knowledge Phone — Field Manual Datasheet
   ============================================================ */

:root {
  --color-bg: #E4DBC6;
  --color-fg: #1A1815;
  --color-accent: #E8501C;

  /* derived, from fg at reduced alpha */
  --rule: rgba(26, 24, 21, 0.28);
  --rule-soft: rgba(26, 24, 21, 0.14);
  --ink-mute: rgba(26, 24, 21, 0.62);
  --paper-panel: rgba(26, 24, 21, 0.035);

  --font-display: "Saira Condensed", "Arial Narrow", sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, "Courier New", monospace;

  --maxw: 860px;
  --pad: clamp(20px, 5vw, 56px);
}

* { box-sizing: border-box; }

html, body { margin: 0; padding: 0; }

body {
  background-color: var(--color-bg);
  background-image:
    repeating-linear-gradient(0deg, transparent 0 39px, var(--rule-soft) 39px 40px);
  color: var(--color-fg);
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: 1.62;
  -webkit-font-smoothing: antialiased;
}

/* ruled left margin of a manual page */
.doc-margin {
  position: fixed;
  top: 0; bottom: 0;
  left: clamp(14px, 4vw, 40px);
  width: 1px;
  background: var(--color-accent);
  opacity: 0.5;
  z-index: 0;
}
@media (max-width: 620px) { .doc-margin { display: none; } }

/* ---------- manual header bar ---------- */
.manual-bar {
  position: relative;
  z-index: 1;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding: 10px var(--pad);
  border-bottom: 2px solid var(--color-fg);
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  background: var(--color-bg);
}
.manual-bar .mb-mid { font-weight: 600; }
.manual-bar .mb-left,
.manual-bar .mb-right { color: var(--ink-mute); }
@media (max-width: 620px) {
  .manual-bar .mb-mid { display: none; }
  .manual-bar { font-size: 9.5px; }
}

main {
  position: relative;
  z-index: 1;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--pad);
}

/* ---------- HERO ---------- */
.hero { padding: clamp(40px, 8vw, 80px) 0 clamp(32px, 6vw, 56px); }

.eyebrow {
  font-family: var(--font-display);
  font-weight: 300;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  font-size: clamp(12px, 2.4vw, 15px);
  margin: 0 0 22px;
  color: var(--color-fg);
  display: inline-block;
  border: 1px solid var(--color-fg);
  padding: 5px 12px 4px;
}

.headline {
  font-family: var(--font-display);
  font-weight: 900;
  text-transform: uppercase;
  line-height: 0.96;
  letter-spacing: -0.005em;
  font-size: clamp(38px, 8.4vw, 84px);
  margin: 0 0 26px;
}
.headline .neg {
  display: block;
  margin-top: 0.28em;
  font-weight: 700;
  font-size: 0.5em;
  letter-spacing: 0.01em;
  color: var(--ink-mute);
}

.subhead {
  max-width: 60ch;
  font-size: clamp(14px, 2vw, 16px);
  margin: 0 0 38px;
}

/* ---------- SIGNATURE: device self-test ---------- */
.selftest {
  border: 1.5px solid var(--color-fg);
  padding: 16px clamp(14px, 3vw, 22px) 18px;
  max-width: 460px;
  background: var(--paper-panel);
}
.st-head {
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-mute);
  border-bottom: 1px dashed var(--rule);
  padding-bottom: 8px;
  margin-bottom: 12px;
}
.st-line {
  display: flex;
  align-items: baseline;
  font-size: 13px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 3px 0;

  opacity: 0;
  transform: translateY(1px);
  animation: lineIn 0.4s ease forwards;
  animation-delay: calc(0.15s + var(--i) * 0.2s);
}
.st-k { white-space: nowrap; }
.st-dots {
  flex: 1 1 auto;
  margin: 0 8px;
  border-bottom: 1px dotted var(--rule);
  transform: translateY(-3px);
}
.st-v { font-weight: 600; }

.st-signal {
  margin-top: 10px;
  padding-top: 12px;
  border-top: 1px solid var(--rule);
}
.signal-val {
  display: grid;
  font-weight: 600;
  font-size: 14px;
  letter-spacing: 0.08em;
}
.signal-val > span { grid-area: 1 / 1; }
.sig-search {
  color: var(--color-fg);
  animation: fadeOut 0.35s ease forwards;
  animation-delay: 1.7s;
}
.sig-ok {
  color: var(--color-accent);
  opacity: 0;
  animation: fadeIn 0.5s ease forwards;
  animation-delay: 1.85s;
}

@keyframes lineIn {
  from { opacity: 0; transform: translateY(1px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes fadeOut { from { opacity: 1; } to { opacity: 0; } }
@keyframes fadeIn  { from { opacity: 0; } to { opacity: 1; } }

/* Fallbacks: end-state visible with no JS OR reduced motion */
.no-js .st-line { opacity: 1; transform: none; animation: none; }
.no-js .sig-search { display: none; }
.no-js .sig-ok { opacity: 1; animation: none; }

@media (prefers-reduced-motion: reduce) {
  .st-line { opacity: 1; transform: none; animation: none; }
  .sig-search { display: none; }
  .sig-ok { opacity: 1; animation: none; }
  * { animation-duration: 0.001ms !important; animation-delay: 0s !important; }
}

/* ---------- price plate ---------- */
.price-plate {
  margin-top: 30px;
  display: inline-flex;
  align-items: baseline;
  gap: 14px;
  flex-wrap: wrap;
  border: 1px solid var(--color-fg);
  padding: 10px 16px;
}
.pp-label {
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-mute);
}
.pp-value {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 30px;
  line-height: 1;
}
.pp-note { font-size: 11px; color: var(--ink-mute); }

/* ---------- doc sections ---------- */
.doc-section {
  border-top: 1px solid var(--rule);
  padding: clamp(34px, 6vw, 58px) 0;
}
.sec-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 20px;
}
.sec-num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--color-accent);
  border: 1px solid var(--color-accent);
  padding: 3px 7px 2px;
  flex: none;
  transform: translateY(-2px);
}
.sec-head h2 {
  font-family: var(--font-display);
  font-weight: 900;
  text-transform: uppercase;
  line-height: 1.0;
  letter-spacing: 0.005em;
  font-size: clamp(24px, 5vw, 42px);
  margin: 0;
}
.sec-body { max-width: 66ch; }
.sec-body p { margin: 0 0 16px; }
.sec-body p:last-child { margin-bottom: 0; }

/* ---------- spec table ---------- */
.spec-table {
  margin-top: 26px;
  border: 1.5px solid var(--color-fg);
  padding: 14px clamp(14px, 3vw, 22px) 18px;
  background: var(--paper-panel);
}
.spec-caption {
  font-size: 10.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-mute);
  border-bottom: 1px dashed var(--rule);
  padding-bottom: 9px;
  margin-bottom: 6px;
}
.spec-row {
  display: flex;
  align-items: baseline;
  padding: 8px 0;
  font-size: 12.5px;
  border-bottom: 1px solid var(--rule-soft);
}
.spec-row:last-child { border-bottom: none; }
.spec-row .k {
  text-transform: uppercase;
  letter-spacing: 0.04em;
  flex: 0 1 auto;
}
.spec-row .dots {
  flex: 1 1 12px;
  min-width: 12px;
  margin: 0 8px;
  border-bottom: 1px dotted var(--rule);
  transform: translateY(-3px);
}
.spec-row .v {
  flex: none;
  color: var(--ink-mute);
  text-align: right;
}
@media (max-width: 540px) {
  .spec-row { flex-wrap: wrap; }
  .spec-row .dots { flex-basis: 100%; margin: 6px 0; transform: none; }
  .spec-row .v { text-align: left; }
}

/* ---------- demo frame ---------- */
.demo-frame {
  margin: 26px 0 0;
  border: 1.5px solid var(--color-fg);
  background: var(--paper-panel);
}
.demo-status {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 9px 14px;
  border-bottom: 1px solid var(--rule);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.demo-status .ap { color: var(--color-accent); font-weight: 600; }
.demo-status .off { color: var(--ink-mute); }
.demo-plate {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 190px;
  padding: 30px 16px;
  text-align: center;
  background-image:
    repeating-linear-gradient(45deg, transparent 0 11px, var(--rule-soft) 11px 12px);
}
.demo-tag {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-size: clamp(15px, 3.4vw, 20px);
}
.demo-sub { font-size: 11.5px; color: var(--ink-mute); letter-spacing: 0.06em; }
.demo-frame figcaption {
  padding: 9px 14px;
  border-top: 1px solid var(--rule);
  font-size: 11px;
  color: var(--ink-mute);
  letter-spacing: 0.04em;
}

/* ---------- founder ---------- */
.founder .sec-body p { border-left: 2px solid var(--color-accent); padding-left: 16px; }

/* ---------- scarcity ---------- */
.scarcity {
  margin-top: 20px !important;
  border: 1px dashed var(--color-fg);
  padding: 14px 16px;
  font-size: 13px;
}

/* ---------- checklist ---------- */
.checklist { list-style: none; margin: 0; padding: 0; }
.checklist li {
  position: relative;
  padding: 12px 0 12px 30px;
  border-bottom: 1px solid var(--rule-soft);
  font-size: 13.5px;
}
.checklist li:last-child { border-bottom: none; }
.checklist li::before {
  content: "✓";
  position: absolute;
  left: 0;
  top: 12px;
  color: var(--color-accent);
  font-weight: 600;
}

/* ---------- CTA ---------- */
.cta-block {
  position: relative;
  z-index: 1;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(40px, 7vw, 68px) var(--pad) clamp(48px, 8vw, 80px);
  border-top: 2px solid var(--color-fg);
  text-align: center;
}
.cta-callout {
  display: inline-flex;
  flex-direction: column;
  gap: 3px;
  margin-bottom: 26px;
  border: 1px solid var(--rule);
  padding: 10px 16px;
}
.cc-k {
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-mute);
}
.cc-v { font-size: 12.5px; }

.cta {
  display: inline-block;
  font-family: var(--font-display);
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  font-size: clamp(15px, 3vw, 20px);
  line-height: 1.15;
  color: var(--color-bg);
  background: var(--color-accent);
  border: 2px solid var(--color-fg);
  padding: 18px 30px;
  max-width: 560px;
  cursor: pointer;
  box-shadow: 5px 5px 0 var(--color-fg);
  transition: transform 0.12s ease, box-shadow 0.12s ease;
}
.cta:hover { transform: translate(-2px, -2px); box-shadow: 7px 7px 0 var(--color-fg); }
.cta:active { transform: translate(2px, 2px); box-shadow: 2px 2px 0 var(--color-fg); }

.cta-micro {
  max-width: 56ch;
  margin: 22px auto 0;
  font-size: 12px;
  color: var(--ink-mute);
  line-height: 1.6;
}

/* ---------- focus ---------- */
a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 3px;
}

/* ---------- footer ---------- */
.site-footer {
  position: relative;
  z-index: 1;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 26px var(--pad) 44px;
  border-top: 1px solid var(--rule);
  text-align: center;
}
.foot-line {
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--ink-mute);
  margin: 0 0 12px;
  text-transform: uppercase;
}
.foot-links { margin: 0; font-size: 11px; letter-spacing: 0.08em; }
.foot-links a {
  color: var(--color-fg);
  text-decoration: none;
  text-transform: uppercase;
  border-bottom: 1px solid var(--rule);
  padding-bottom: 1px;
}
.foot-links a:hover { color: var(--color-accent); border-color: var(--color-accent); }
.foot-links span { color: var(--ink-mute); margin: 0 6px; }