/* ==========================================================================
   IP Inbound — marketing site

   Direction: a chronometer certificate, not a cockpit. The screenshots carry
   the instrument language; the page is the calibrated bench they sit on.
   Monochrome throughout, with a single red reserved for index marks and the
   primary action — the way a precision dial spends its one accent.

   Rule of the house: a hairline may divide, but a *graduated* rule must
   measure something real. No decorative tick marks.
   ========================================================================== */

/* --------------------------------------------------------------------------
   Faces — self-hosted, no external requests. Both SIL OFL.
   Archivo carries a width axis (62–125%); display type runs expanded, like a
   panel nameplate. IBM Plex Mono carries every label, stamp and numeral.
   -------------------------------------------------------------------------- */

@font-face {
  font-family: "Archivo";
  src: url("../fonts/archivo-var.woff2") format("woff2");
  font-weight: 400 700;
  font-stretch: 62% 125%;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "Plex Mono";
  src: url("../fonts/plexmono-400.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "Plex Mono";
  src: url("../fonts/plexmono-500.woff2") format("woff2");
  font-weight: 500;
  font-style: normal;
  font-display: swap;
}

/* --------------------------------------------------------------------------
   Tokens
   -------------------------------------------------------------------------- */

:root {
  color-scheme: light dark;

  /* Red is an index mark, never a mood. It is split in two because a mark and
     a button fill have opposite contrast needs: the mark must carry against
     the page, the fill must carry white text. */
  --paper: light-dark(#eff0f2, #0d0f12);
  --panel: light-dark(#e6e8eb, #14171b);
  --ink: light-dark(#16191e, #e9ebee);
  --steel: light-dark(#5f6670, #878e98);
  --hairline: light-dark(#a8afba, #3a4049);
  --index: light-dark(#c1121f, #e84a58);
  --index-solid: light-dark(#c1121f, #c8202f);

  --font-display: "Archivo", ui-sans-serif, system-ui, sans-serif;
  --font-body: "Archivo", ui-sans-serif, system-ui, sans-serif;
  --font-mono: "Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;

  --step--1: 0.78rem;
  --step-0: clamp(0.98rem, 0.94rem + 0.18vw, 1.06rem);
  --step-1: clamp(1.12rem, 1.05rem + 0.32vw, 1.3rem);
  --step-2: clamp(1.5rem, 1.3rem + 0.9vw, 2.1rem);
  --step-3: clamp(2.1rem, 1.7rem + 1.9vw, 3.2rem);
  --step-4: clamp(2.9rem, 2.05rem + 4vw, 5.6rem);

  --space-2xs: 0.25rem;
  --space-xs: 0.5rem;
  --space-s: 0.75rem;
  --space-m: 1.25rem;
  --space-l: 2rem;
  --space-xl: 3.25rem;
  --space-2xl: 5.5rem;
  --space-3xl: 8rem;

  --wrap: 1180px;
  --measure: 58ch;
  --rail: 7.5rem;
  --header-h: 3.75rem;
}

/* --------------------------------------------------------------------------
   Reset & base
   -------------------------------------------------------------------------- */

*,
*::before,
*::after {
  box-sizing: border-box;
}

* {
  margin: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + var(--space-l));
}

body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: var(--step-0);
  font-stretch: 100%;
  line-height: 1.62;
  -webkit-font-smoothing: antialiased;
  font-variant-numeric: tabular-nums;
}

img,
picture,
svg {
  display: block;
  max-width: 100%;
  height: auto;
}

a {
  color: inherit;
}

p {
  text-wrap: pretty;
}

:where(a, button, [tabindex]):focus-visible {
  outline: 2px solid var(--index);
  outline-offset: 3px;
}

/* --------------------------------------------------------------------------
   Type roles
   -------------------------------------------------------------------------- */

.display {
  font-family: var(--font-display);
  font-stretch: 118%;
  font-weight: 700;
  line-height: 1.02;
  letter-spacing: -0.022em;
  text-wrap: balance;
}

h1.display {
  font-size: var(--step-4);
}

h2.display {
  font-size: var(--step-3);
}

h3 {
  font-family: var(--font-display);
  font-stretch: 108%;
  font-weight: 600;
  font-size: var(--step-1);
  line-height: 1.2;
  letter-spacing: -0.008em;
}

/* Mono label — the page's connective tissue. Every stamp, caption and
   nameplate uses this one treatment. */
.label {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--steel);
}

.lede {
  font-size: var(--step-1);
  line-height: 1.5;
  color: var(--steel);
  max-width: var(--measure);
}

/* --------------------------------------------------------------------------
   Utilities
   -------------------------------------------------------------------------- */

.wrap {
  width: min(100% - 2.5rem, var(--wrap));
  margin-inline: auto;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.skip-link {
  position: absolute;
  inset-inline-start: var(--space-m);
  inset-block-start: -4rem;
  z-index: 100;
  padding: var(--space-xs) var(--space-m);
  background: var(--paper);
  border: 1px solid var(--index);
  font-family: var(--font-mono);
  font-size: var(--step--1);
  text-decoration: none;
  transition: inset-block-start 150ms ease;

  &:focus {
    inset-block-start: var(--space-xs);
  }
}

/* --------------------------------------------------------------------------
   Buttons — 2px radius reads machined; 0 reads broadsheet.
   -------------------------------------------------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 0.7rem 1.35rem;
  border: 1px solid transparent;
  border-radius: 2px;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  text-decoration: none;
  white-space: nowrap;
  transition:
    background-color 160ms ease,
    border-color 160ms ease,
    color 160ms ease;
}

.btn-index {
  background: var(--index-solid);
  border-color: var(--index-solid);
  color: #fff;

  &:hover {
    background: color-mix(in srgb, var(--index-solid) 84%, #000);
    border-color: color-mix(in srgb, var(--index-solid) 84%, #000);
  }
}

.btn-outline {
  border-color: var(--hairline);
  color: var(--ink);

  &:hover {
    border-color: var(--ink);
  }
}

.btn-sm {
  padding: 0.5rem 0.9rem;
}

/* --------------------------------------------------------------------------
   Header
   -------------------------------------------------------------------------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--paper) 90%, transparent);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--hairline);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: var(--space-m);
  min-height: var(--header-h);
}

.nameplate {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-inline-end: auto;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--ink);

  & img {
    border-radius: 5px;
  }
}

.site-nav ul {
  display: flex;
  gap: var(--space-l);
  list-style: none;
  padding: 0;
}

.site-nav a {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--steel);
  padding-block: 0.25rem;
  border-bottom: 1px solid transparent;
  transition:
    color 160ms ease,
    border-color 160ms ease;

  &:hover {
    color: var(--ink);
  }

  &[aria-current="true"] {
    color: var(--ink);
    border-bottom-color: var(--index);
  }
}

.nav-toggle {
  display: none;
  width: 2.5rem;
  height: 2.5rem;
  padding: 0;
  background: none;
  border: 1px solid var(--hairline);
  border-radius: 2px;
  cursor: pointer;
}

.nav-toggle-bars,
.nav-toggle-bars::before,
.nav-toggle-bars::after {
  display: block;
  width: 16px;
  height: 1px;
  margin-inline: auto;
  background: var(--ink);
}

.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: relative;
}

.nav-toggle-bars::before {
  top: -5px;
}

.nav-toggle-bars::after {
  top: 4px;
}

@media (width < 54rem) {
  .header-cta {
    display: none;
  }

  .nav-toggle {
    display: block;
    order: 2;
  }

  .site-nav {
    order: 3;
    flex-basis: 100%;
    display: none;

    &[data-open] {
      display: block;
    }

    & ul {
      flex-direction: column;
      gap: var(--space-s);
      padding-block: var(--space-m);
    }
  }
}

/* --------------------------------------------------------------------------
   Hero
   -------------------------------------------------------------------------- */

.hero {
  padding-block: var(--space-2xl) 0;
}

.hero-grid {
  display: grid;
  gap: var(--space-xl);
  align-items: end;
  grid-template-columns: 1fr;
}

@media (width >= 60rem) {
  .hero-grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
  }
}

.hero-copy {
  display: flex;
  flex-direction: column;
  gap: var(--space-m);
}

.hero-copy .label {
  margin-bottom: var(--space-xs);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-s);
  margin-top: var(--space-xs);
}

/* Spec line under the CTAs — reads as a nameplate stamp, not marketing filler */
.hero-spec {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 0.9rem;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  color: var(--steel);
  letter-spacing: 0.04em;
}

.hero-spec span::after {
  content: " ·";
  color: var(--hairline);
}

.hero-spec span:last-child::after {
  content: "";
}

.hero-shot {
  justify-self: center;
}

.hero-shot img {
  width: min(100%, 306px);
}

/* --------------------------------------------------------------------------
   SIGNATURE — the deviation scale.

   A chronometer certificate reports rate deviation in seconds; so does this
   app's post-pass screen. The scale spans −20 s to +20 s across its full
   width: minor ticks each second, major ticks each five, and the red index
   at zero. On load the needle settles to zero like a damped instrument.
   -------------------------------------------------------------------------- */

.scale {
  margin-top: var(--space-2xl);
  padding-block: var(--space-m);
  border-top: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
}

.scale-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-m);
  margin-bottom: var(--space-s);
}

.scale-readout {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: var(--step-1);
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

.scale-readout .unit {
  color: var(--steel);
  margin-left: 0.15em;
}

.scale-track {
  position: relative;
  height: 2.6rem;
}

/* Minor graduations — one per second across the 40-second span */
.scale-track::before {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 42%;
  background-image: repeating-linear-gradient(
    to right,
    var(--hairline) 0 1px,
    transparent 1px calc(100% / 40)
  );
}

/* Major graduations — one per five seconds */
.scale-track::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 74%;
  background-image: repeating-linear-gradient(
    to right,
    var(--steel) 0 1px,
    transparent 1px calc(100% / 8)
  );
}

/* The index: zero. The only red on the page besides the primary action.
   Carries a marker above the graduated band so it stays legible when the
   needle comes to rest on top of it. */
.scale-index {
  position: absolute;
  left: 50%;
  bottom: 0;
  width: 1px;
  height: 100%;
  background: var(--index);
  transform: translateX(-0.5px);
}

.scale-index::before {
  content: "";
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  border-left: 5px solid transparent;
  border-right: 5px solid transparent;
  border-top: 7px solid var(--index);
}

/* Defaults to the index so the no-JS state matches the static readout; the
   settle animation sets --pos from its start position onward. */
.scale-needle {
  position: absolute;
  bottom: 0;
  left: var(--pos, 50%);
  width: 2px;
  height: 76%;
  background: var(--ink);
  transform: translateX(-1px);
  z-index: 2;
}

.scale-needle::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 50%;
  width: 7px;
  height: 7px;
  background: var(--ink);
  transform: translateX(-50%) rotate(45deg);
}

.scale-legend {
  display: flex;
  justify-content: space-between;
  margin-top: var(--space-xs);
  font-family: var(--font-mono);
  font-size: var(--step--1);
  color: var(--steel);
}

.scale-legend span:nth-child(3) {
  color: var(--index);
}

/* --------------------------------------------------------------------------
   Sections
   -------------------------------------------------------------------------- */

.section {
  padding-block: var(--space-3xl);
}

.section-panel {
  background: var(--panel);
}

/* Section heads share the rail with the step stamps and the spec terms, so a
   single annotation column runs the length of the page. */
.section-head {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-s);
  margin-bottom: var(--space-xl);
}

@media (width >= 60rem) {
  .section-head {
    grid-template-columns: var(--rail) minmax(0, 1fr);
    column-gap: var(--space-l);
  }

  .section-head .label {
    grid-column: 1;
    grid-row: 1 / span 2;
    padding-top: 0.6rem;
  }

  .section-head .display,
  .section-head .lede {
    grid-column: 2;
  }
}

.prose-block {
  max-width: var(--measure);
  display: flex;
  flex-direction: column;
  gap: var(--space-m);
}

@media (width >= 60rem) {
  .rail-offset {
    margin-left: calc(var(--rail) + var(--space-l));
  }
}

/* --------------------------------------------------------------------------
   How it works — a countdown, not a numbered list.

   Each stamp is the real clock offset from the fixtures that produced the
   screenshot beside it, so the column reads as a genuine timeline running
   from thirty minutes out to eight seconds past the target.
   -------------------------------------------------------------------------- */

/* Plate figures: uniform cells, each stamped with its station on the clock.
   Set side-by-side, a 2:1 portrait screenshot beside three lines of copy
   leaves an unfillable void; as plates the rows stay dense and regular. */
.steps {
  list-style: none;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  column-gap: var(--space-l);
  row-gap: var(--space-xl);
}

@media (width >= 46rem) {
  .steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (width >= 68rem) {
  .steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.step {
  display: flex;
  flex-direction: column;
  gap: var(--space-s);
  padding-top: var(--space-m);
  border-top: 1px solid var(--hairline);
}

.step-stamp {
  order: 1;
}

.step-shot {
  order: 2;
}

.step-copy {
  order: 3;
}

/* Station stamp: the real clock offset that produced the plate beside it. */
.step-stamp {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-s);
  font-family: var(--font-mono);
  font-size: var(--step--1);
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--ink);
}

.step-stamp .qualifier {
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--steel);
}

/* Contingency branch — the one step that leaves the nominal timeline */
.step-contingency .step-stamp {
  color: var(--index);
}

.step-contingency .step-stamp .qualifier {
  color: var(--index);
}

.step-copy {
  display: flex;
  flex-direction: column;
  gap: var(--space-s);
  max-width: 52ch;
}

.step-copy h3 {
  margin-bottom: var(--space-2xs);
}

.step-copy p {
  color: var(--steel);
}

.step-shot {
  padding-block: var(--space-2xs) var(--space-xs);
}

.step-shot img {
  width: min(100%, 12.5rem);
}

/* --------------------------------------------------------------------------
   Specification — the features, set as a spec sheet rather than cards.
   -------------------------------------------------------------------------- */

.spec {
  display: grid;
  grid-template-columns: 1fr;
}

.spec-row {
  display: grid;
  gap: var(--space-2xs) var(--space-l);
  grid-template-columns: 1fr;
  padding-block: var(--space-m);
  border-top: 1px solid var(--hairline);
  transition: border-color 160ms ease;
}

.spec-row:last-child {
  border-bottom: 1px solid var(--hairline);
}

.spec-row:hover {
  border-top-color: var(--ink);
}

@media (width >= 48rem) {
  .spec-row {
    grid-template-columns: var(--rail) minmax(0, 1fr);
  }
}

.spec-row dt {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--steel);
  padding-top: 0.15rem;
}

.spec-row dd {
  margin: 0;
  max-width: var(--measure);
}

/* --------------------------------------------------------------------------
   Download
   -------------------------------------------------------------------------- */

.download-inner {
  display: flex;
  flex-direction: column;
  gap: var(--space-m);
  align-items: flex-start;
  max-width: var(--measure);
}

.disclaimer {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  line-height: 1.7;
  color: var(--steel);
  padding-top: var(--space-m);
  border-top: 1px solid var(--hairline);
  max-width: 62ch;
}

/* --------------------------------------------------------------------------
   Prose (privacy)
   -------------------------------------------------------------------------- */

.page-head {
  padding-block: var(--space-2xl) var(--space-l);
  border-bottom: 1px solid var(--hairline);
}

.prose {
  max-width: var(--measure);
  padding-block: var(--space-xl) var(--space-3xl);
}

.prose > * + * {
  margin-top: var(--space-m);
}

.prose h2 {
  font-family: var(--font-display);
  font-stretch: 112%;
  font-weight: 700;
  font-size: var(--step-2);
  line-height: 1.15;
  letter-spacing: -0.012em;
  margin-top: var(--space-2xl);
  padding-top: var(--space-m);
  border-top: 1px solid var(--hairline);
}

.prose h3 {
  margin-top: var(--space-l);
}

.prose p {
  color: var(--steel);
}

.prose a {
  color: var(--ink);
  text-decoration-color: var(--index);
  text-underline-offset: 0.2em;
}

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

.site-footer {
  padding-block: var(--space-xl);
  border-top: 1px solid var(--hairline);
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-m) var(--space-l);
  align-items: center;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  color: var(--steel);
}

.site-footer nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-l);
  list-style: none;
  padding: 0;
}

.site-footer a {
  text-decoration: none;
  letter-spacing: 0.12em;
  text-transform: uppercase;

  &:hover {
    color: var(--ink);
  }
}

/* --------------------------------------------------------------------------
   Motion — one orchestrated moment (the needle), nothing else.
   -------------------------------------------------------------------------- */

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}