/* SteadyLatch — site stylesheet. Tokens documented in docs/brand/BRAND.md. No third-party resources. */

@font-face {
  font-family: "IBM Plex Sans";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("../fonts/ibm-plex-sans-latin-400-normal.woff2") format("woff2");
}
@font-face {
  font-family: "IBM Plex Sans";
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url("../fonts/ibm-plex-sans-latin-600-normal.woff2") format("woff2");
}
@font-face {
  font-family: "IBM Plex Mono";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("../fonts/ibm-plex-mono-latin-400-normal.woff2") format("woff2");
}
@font-face {
  font-family: "IBM Plex Mono";
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url("../fonts/ibm-plex-mono-latin-500-normal.woff2") format("woff2");
}

:root {
  color-scheme: light dark;

  /* Color — light */
  --sl-paper: #f6f5f1;
  --sl-surface: #ffffff;
  --sl-ink: #14201c;
  --sl-muted: #4b5954;
  --sl-line: #d5dad5;
  --sl-grid: rgba(20, 32, 28, 0.045);
  --sl-accent: #0a6b5e;
  --sl-on-accent: #ffffff;
  --sl-accent-soft: #e6f2ef;
  --sl-warn: #8f4a0a;
  --sl-warn-soft: #fbf1e4;

  /* Type */
  --sl-font-sans: "IBM Plex Sans", "Segoe UI", system-ui, sans-serif;
  --sl-font-mono: "IBM Plex Mono", "Cascadia Mono", Consolas, ui-monospace, monospace;
  --sl-text-sm: 0.875rem;
  --sl-text-base: clamp(1rem, 0.96rem + 0.2vw, 1.0625rem);
  --sl-text-lg: clamp(1.125rem, 1.05rem + 0.35vw, 1.3125rem);
  --sl-text-xl: clamp(1.5rem, 1.25rem + 1.1vw, 2.125rem);
  --sl-text-hero: clamp(2.125rem, 1.35rem + 3.6vw, 4.25rem);

  /* Space & shape */
  --sl-gutter: clamp(1rem, 0.6rem + 2vw, 2.5rem);
  --sl-section: clamp(3rem, 2rem + 4vw, 6rem);
  --sl-max: 72rem;
  --sl-radius: 4px;
  --sl-radius-lg: 10px;
  --sl-shadow: 0 1px 0 rgba(20, 32, 28, 0.06), 0 12px 32px -18px rgba(20, 32, 28, 0.28);
  --sl-ease: cubic-bezier(0.16, 1, 0.3, 1);
}

@media (prefers-color-scheme: dark) {
  :root {
    --sl-paper: #0e1412;
    --sl-surface: #151d1a;
    --sl-ink: #e5ece9;
    --sl-muted: #a3b1ab;
    --sl-line: #2b3632;
    --sl-grid: rgba(229, 236, 233, 0.035);
    --sl-accent: #5bc6b3;
    --sl-on-accent: #0e1412;
    --sl-accent-soft: #13261f;
    --sl-warn: #edb35e;
    --sl-warn-soft: #2a2014;
    --sl-shadow: 0 1px 0 rgba(0, 0, 0, 0.4), 0 16px 40px -20px rgba(0, 0, 0, 0.8);
  }
}

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  margin: 0;
  background: var(--sl-paper);
  color: var(--sl-ink);
  font-family: var(--sl-font-sans);
  font-size: var(--sl-text-base);
  line-height: 1.6;
  overflow-wrap: break-word;
}

h1,
h2,
h3 {
  line-height: 1.15;
  font-weight: 600;
  letter-spacing: -0.015em;
  margin: 0 0 0.6em;
  text-wrap: balance;
}

p,
li,
dd {
  text-wrap: pretty;
}

.num,
.price {
  font-variant-numeric: tabular-nums;
}

h2 {
  font-size: var(--sl-text-xl);
}

h3 {
  font-size: var(--sl-text-lg);
  letter-spacing: -0.005em;
}

p,
ul,
ol,
dl {
  margin: 0 0 1em;
}

a {
  color: var(--sl-accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

a:hover {
  text-decoration-thickness: 2px;
}

:focus-visible {
  outline: 3px solid var(--sl-accent);
  outline-offset: 3px;
  border-radius: 2px;
}

code,
.mono {
  font-family: var(--sl-font-mono);
  font-size: 0.92em;
}

.skip-link {
  position: absolute;
  left: var(--sl-gutter);
  top: -4rem;
  z-index: 10;
  padding: 0.6rem 0.9rem;
  background: var(--sl-ink);
  color: var(--sl-paper);
  border-radius: var(--sl-radius);
}

.skip-link:focus {
  top: 0.75rem;
}

.wrap {
  max-width: var(--sl-max);
  margin: 0 auto;
  padding: 0 var(--sl-gutter);
}

/* Header */
.site-header {
  border-bottom: 1px solid var(--sl-line);
}

.site-header .wrap {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem 1.5rem;
  padding-top: 1rem;
  padding-bottom: 1rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--sl-ink);
  text-decoration: none;
  font-size: 1.125rem;
  letter-spacing: -0.01em;
}

.brand svg {
  width: 28px;
  height: 28px;
  flex: none;
}

.brand b {
  font-weight: 600;
}

.mark-bg {
  fill: var(--sl-accent);
}

.mark-fg {
  fill: none;
  stroke: var(--sl-on-accent);
  stroke-linecap: round;
  stroke-linejoin: round;
}

.site-nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.25rem;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--sl-font-mono);
  font-size: var(--sl-text-sm);
}

.site-nav a {
  display: inline-block;
  color: var(--sl-muted);
  text-decoration: none;
  padding: 0.7rem 0.1rem;
}

.site-nav a:hover {
  color: var(--sl-ink);
  text-decoration: underline;
}

/* Hero — engineering-paper grid as texture */
.hero {
  position: relative;
  border-bottom: 1px solid var(--sl-line);
  background-image:
    linear-gradient(var(--sl-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--sl-grid) 1px, transparent 1px);
  background-size: 24px 24px;
  background-position: -1px -1px;
}

.hero .wrap {
  padding-top: clamp(3rem, 2rem + 6vw, 7.5rem);
  padding-bottom: clamp(2.5rem, 1.5rem + 4vw, 5.5rem);
}

.kicker {
  display: inline-block;
  margin: 0 0 1.25rem;
  font-family: var(--sl-font-mono);
  font-size: var(--sl-text-sm);
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--sl-accent);
}

.hero-grid {
  display: grid;
  gap: 2.5rem;
}

@media (min-width: 60rem) {
  .hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
    gap: 4rem;
  }
}

.hero h1 {
  font-size: var(--sl-text-hero);
  letter-spacing: -0.03em;
  max-width: 19ch;
  margin-bottom: 1.5rem;
}

.hero h1 span {
  color: var(--sl-muted);
  font-weight: 400;
}

.lede {
  font-size: var(--sl-text-lg);
  color: var(--sl-muted);
  max-width: 62ch;
  margin-bottom: 2rem;
}

/* Product sheet: the "latch" corners are the brand's one decorative motif */
.spec {
  position: relative;
  padding: 1.25rem 1.25rem 0.5rem;
  background: var(--sl-surface);
  border: 1px solid var(--sl-line);
  border-radius: var(--sl-radius);
  box-shadow: var(--sl-shadow);
}

.spec::before,
.spec::after {
  content: "";
  position: absolute;
  width: 18px;
  height: 18px;
  border: 0 solid var(--sl-accent);
  pointer-events: none;
}

.spec::before {
  top: -7px;
  left: -7px;
  border-top-width: 3px;
  border-left-width: 3px;
}

.spec::after {
  right: -7px;
  bottom: -7px;
  border-right-width: 3px;
  border-bottom-width: 3px;
}

.spec-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem 1rem;
  margin: 0 0 0.75rem;
  font-weight: 600;
}

.spec-flag {
  padding: 0.1rem 0.5rem;
  border: 1px solid var(--sl-warn);
  border-radius: 999px;
  font-family: var(--sl-font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--sl-warn);
  background: var(--sl-warn-soft);
}

.spec dl {
  margin: 0;
}

.spec dl > div {
  display: grid;
  grid-template-columns: minmax(0, 9.5rem) minmax(0, 1fr);
  gap: 0.25rem 1rem;
  padding: 0.7rem 0;
  border-top: 1px solid var(--sl-line);
}

.spec dt {
  font-family: var(--sl-font-mono);
  font-size: var(--sl-text-sm);
  color: var(--sl-muted);
}

.spec dd {
  margin: 0;
}

@media (max-width: 22rem) {
  .spec dl > div {
    grid-template-columns: minmax(0, 1fr);
  }
}

.hero-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  min-height: 44px;
  padding: 0.6rem 1.1rem;
  border: 1px solid var(--sl-accent);
  border-radius: var(--sl-radius);
  font-weight: 600;
  text-decoration: none;
  transition-property: transform, box-shadow;
  transition-duration: 160ms;
  transition-timing-function: var(--sl-ease);
}

.btn--solid {
  background: var(--sl-accent);
  color: var(--sl-on-accent);
}

.btn--ghost {
  background: transparent;
  color: var(--sl-accent);
}

.btn:hover {
  text-decoration: none;
  transform: translateY(-1px);
  box-shadow: var(--sl-shadow);
}

.btn:active {
  transform: translateY(0) scale(0.98);
  box-shadow: none;
}

.btn--disabled,
.btn--disabled:hover {
  border-style: dashed;
  border-color: var(--sl-muted);
  color: var(--sl-muted);
  background: transparent;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

/* Sections: label rail + body */
.section {
  border-bottom: 1px solid var(--sl-line);
}

.section > .wrap {
  display: grid;
  gap: 1rem 3rem;
  padding-top: var(--sl-section);
  padding-bottom: var(--sl-section);
}

.section-label {
  margin: 0;
  font-family: var(--sl-font-mono);
  font-size: var(--sl-text-sm);
  color: var(--sl-muted);
  letter-spacing: 0.02em;
}

.section-label b {
  display: block;
  color: var(--sl-ink);
  font-weight: 500;
}

@media (min-width: 60rem) {
  .section > .wrap {
    grid-template-columns: 13rem minmax(0, 1fr);
  }

  .section-label {
    position: sticky;
    top: 1.5rem;
    align-self: start;
  }
}

.section-body > :last-child {
  margin-bottom: 0;
}

.tagline {
  font-size: var(--sl-text-lg);
  color: var(--sl-muted);
  margin-top: -0.25rem;
}

.block {
  margin-top: clamp(2rem, 1.5rem + 2vw, 3.25rem);
}

.block > h3 {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
}

.block > h3 .mono {
  font-size: var(--sl-text-sm);
  font-weight: 500;
  color: var(--sl-accent);
}

.measure {
  max-width: 44rem;
}

/* Status callout */
.status {
  display: grid;
  gap: 0.25rem;
  margin: 1.5rem 0 0;
  padding: 1rem 1.25rem;
  border: 1px solid var(--sl-line);
  border-left: 4px solid var(--sl-warn);
  border-radius: var(--sl-radius);
  background: var(--sl-warn-soft);
  max-width: 44rem;
}

.status strong {
  font-family: var(--sl-font-mono);
  font-size: var(--sl-text-sm);
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--sl-warn);
}

.status p {
  margin: 0;
}

/* Planned flow, drawn as a blueprint */
.flow {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 0;
}

.flow li {
  position: relative;
  padding: 0 0 1.75rem 2rem;
}

.flow li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.3rem;
  width: 0.85rem;
  height: 0.85rem;
  border: 2px solid var(--sl-accent);
  border-radius: 2px;
  background: var(--sl-paper);
}

.flow li::after {
  content: "";
  position: absolute;
  left: calc(0.425rem - 1px);
  top: 1.35rem;
  bottom: 0.2rem;
  border-left: 2px dashed var(--sl-line);
}

.flow li:last-child {
  padding-bottom: 0;
}

.flow li:last-child::after {
  display: none;
}

.flow li:last-child::before {
  background: var(--sl-accent);
}

.flow .mono {
  display: block;
  margin-bottom: 0.3rem;
  font-size: var(--sl-text-sm);
  color: var(--sl-accent);
}

.flow h4 {
  margin: 0 0 0.35rem;
  font-size: 1rem;
  font-weight: 600;
}

.flow p {
  margin: 0;
  color: var(--sl-muted);
}

@media (min-width: 60rem) {
  .flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 1.5rem;
  }

  .flow li {
    padding: 2rem 0 0;
  }

  .flow li::before {
    top: 0;
  }

  .flow li::after {
    left: 1.35rem;
    right: -1.25rem;
    top: calc(0.425rem - 1px);
    bottom: auto;
    border-left: 0;
    border-top: 2px dashed var(--sl-line);
  }
}

/* Scenarios */
.scenarios {
  list-style: none;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--sl-line);
  border: 1px solid var(--sl-line);
  border-radius: var(--sl-radius-lg);
  overflow: hidden;
}

@media (min-width: 44rem) {
  .scenarios {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.scenarios li {
  background: var(--sl-surface);
  padding: 1.25rem 1.25rem 1.4rem;
}

.scenarios h4 {
  margin: 0 0 0.4rem;
  font-size: 1rem;
  font-weight: 600;
}

.scenarios .mono {
  display: block;
  margin-bottom: 0.5rem;
  font-size: var(--sl-text-sm);
  color: var(--sl-accent);
}

.scenarios p {
  margin: 0;
  color: var(--sl-muted);
}

/* Availability: what exists / what's missing */
.availability {
  display: grid;
  gap: 1rem;
}

@media (min-width: 52rem) {
  .availability {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.avail {
  padding: 1.25rem;
  border: 1px solid var(--sl-line);
  border-radius: var(--sl-radius-lg);
  background: var(--sl-surface);
}

.avail h4 {
  margin: 0 0 0.25rem;
  font-size: 1rem;
}

.avail .when {
  display: block;
  margin-bottom: 0.9rem;
  font-family: var(--sl-font-mono);
  font-size: var(--sl-text-sm);
  color: var(--sl-muted);
}

.avail ul {
  margin: 0;
  padding-left: 1.1rem;
}

.avail li + li {
  margin-top: 0.4rem;
}

.avail--now {
  border-top: 4px solid var(--sl-accent);
}

.avail--next {
  border-top: 4px solid var(--sl-warn);
}

.avail--out {
  border-top: 4px solid var(--sl-line);
  background: transparent;
}

/* Offer */
.offer {
  display: grid;
  gap: 1.5rem;
  padding: clamp(1.25rem, 1rem + 1.5vw, 2rem);
  border: 1px solid var(--sl-line);
  border-radius: var(--sl-radius-lg);
  background: var(--sl-surface);
  box-shadow: var(--sl-shadow);
}

@media (min-width: 52rem) {
  .offer {
    grid-template-columns: minmax(0, 15rem) minmax(0, 1fr);
    align-items: start;
  }
}

.price-label {
  margin: 0 0 0.35rem;
  font-family: var(--sl-font-mono);
  font-size: var(--sl-text-sm);
  color: var(--sl-muted);
}

.price {
  margin: 0;
  font-size: clamp(2.5rem, 2rem + 2vw, 3.5rem);
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1;
}

.price-note {
  margin: 0.5rem 0 1.25rem;
  font-family: var(--sl-font-mono);
  font-size: var(--sl-text-sm);
  color: var(--sl-muted);
}

.offer dl {
  display: grid;
  gap: 0.9rem;
  margin: 0;
}

.offer dt {
  font-weight: 600;
}

.offer dd {
  margin: 0.15rem 0 0;
  color: var(--sl-muted);
}

.fineprint {
  font-size: var(--sl-text-sm);
  color: var(--sl-muted);
}

/* Legal pages */
.prose {
  max-width: 44rem;
  padding-top: var(--sl-section);
  padding-bottom: var(--sl-section);
}

.prose h1 {
  font-size: var(--sl-text-xl);
}

.prose h2 {
  font-size: var(--sl-text-lg);
  margin-top: 2.25rem;
}

.prose .updated {
  font-family: var(--sl-font-mono);
  font-size: var(--sl-text-sm);
  color: var(--sl-muted);
}

.prose dl {
  display: grid;
  gap: 0.25rem 1.5rem;
}

@media (min-width: 40rem) {
  .prose dl {
    grid-template-columns: 12rem minmax(0, 1fr);
  }
}

.prose dt {
  font-weight: 600;
}

.prose dd {
  margin: 0 0 0.5rem;
}

.todo {
  font-family: var(--sl-font-mono);
  font-size: 0.9em;
  color: var(--sl-warn);
  background: var(--sl-warn-soft);
  padding: 0 0.3em;
  border-radius: 2px;
}

/* Footer */
.site-footer {
  padding: 2rem 0 3rem;
  font-size: var(--sl-text-sm);
  color: var(--sl-muted);
}

.site-footer .wrap {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem 2rem;
}

.site-footer ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.25rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-footer a {
  display: inline-block;
  padding: 0.6rem 0;
  color: var(--sl-muted);
}

.site-footer a:hover {
  color: var(--sl-ink);
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition: none !important;
  }
}