/* ==========================================================================
   ParkSense AI — core design system
   Tokens, base typography, layout primitives and shared components.
   Page-specific styles live in src/assets/css/pages/<page>.css.
   ========================================================================== */

/* ---------- Fonts (self-hosted, SIL OFL 1.1 — see /assets/fonts/LICENSE-*) ---------- */
@font-face {
  font-family: 'Instrument Serif';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('/assets/fonts/instrument-serif-latin-400-normal.woff2') format('woff2');
}
@font-face {
  font-family: 'Instrument Serif';
  font-style: italic;
  font-weight: 400;
  font-display: swap;
  src: url('/assets/fonts/instrument-serif-latin-400-italic.woff2') format('woff2');
}
@font-face {
  font-family: 'Inter';
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
  src: url('/assets/fonts/inter-latin-wght-normal.woff2') format('woff2');
}
@font-face {
  font-family: 'JetBrains Mono';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('/assets/fonts/jetbrains-mono-latin-400-normal.woff2') format('woff2');
}
@font-face {
  font-family: 'JetBrains Mono';
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url('/assets/fonts/jetbrains-mono-latin-500-normal.woff2') format('woff2');
}

/* ---------- Tokens ---------- */
:root {
  /* Midnight asphalt */
  --ink-1000: #03060b;
  --ink-950: #050911;
  --ink-900: #070c16;
  --ink-850: #0a1120;
  --ink-800: #0d1626;
  --ink-750: #111c30;
  --ink-700: #16233a;
  --ink-600: #22324d;

  /* Cool whites */
  --fog-0: #ffffff;
  --fog-50: #f4f6f9;
  --fog-100: #ebeff4;
  --fog-200: #dde3ea;
  --fog-300: #c5cfda;

  /* Text on dark */
  --text: #e8edf4;
  --text-2: #a9b6c7;
  --text-3: #8496ab;

  /* Text on light */
  --ink-text: #0b1322;
  --ink-text-2: #3a495d;
  --ink-text-3: #56667c;

  /* Signal colours */
  --cyan-200: #b4f3f8;
  --cyan-300: #7eeaf3;
  --cyan-400: #46dbe8;
  --cyan-500: #1fc2d1;
  --teal-600: #0f8f9a;
  --teal-700: #0a6a73;
  --amber-300: #f8c97f;
  --amber-400: #f5b454;
  --amber-500: #e8962a;
  --amber-700: #8a5208;
  --danger-dark: #ff9a8c;
  --danger-light: #b42318;
  --success-dark: #7ee2b8;
  --success-light: #0f7a4f;

  /* Lines */
  --line-d1: rgba(160, 185, 215, 0.12);
  --line-d2: rgba(160, 185, 215, 0.22);
  --line-d3: rgba(160, 185, 215, 0.38);
  --line-l1: rgba(11, 19, 34, 0.1);
  --line-l2: rgba(11, 19, 34, 0.2);
  --line-l3: rgba(11, 19, 34, 0.34);

  /* Type */
  --font-display: 'Instrument Serif', 'Iowan Old Style', 'Palatino Linotype', Palatino, Georgia, serif;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, 'SF Mono', SFMono-Regular, Menlo, Consolas, monospace;

  --step--2: clamp(0.72rem, 0.7rem + 0.08vw, 0.76rem);
  --step--1: clamp(0.84rem, 0.82rem + 0.1vw, 0.9rem);
  --step-0: clamp(1rem, 0.97rem + 0.15vw, 1.075rem);
  --step-1: clamp(1.13rem, 1.07rem + 0.3vw, 1.3rem);
  --step-2: clamp(1.35rem, 1.22rem + 0.6vw, 1.7rem);
  --step-3: clamp(1.7rem, 1.42rem + 1.25vw, 2.5rem);
  --step-4: clamp(2.15rem, 1.65rem + 2.3vw, 3.6rem);
  --step-5: clamp(2.6rem, 1.8rem + 3.7vw, 5.1rem);
  --step-6: clamp(3rem, 1.85rem + 5.4vw, 6.75rem);

  /* Space */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;
  --space-8: 64px;
  --space-9: 96px;
  --space-10: 128px;
  --section-y: clamp(80px, 10.5vw, 160px);
  --section-y-tight: clamp(56px, 7vw, 104px);

  /* Layout */
  --container: 1320px;
  --container-narrow: 920px;
  --container-prose: 720px;
  --gutter: clamp(18px, 4vw, 48px);
  --header-h: 72px;

  --radius-xs: 4px;
  --radius-s: 8px;
  --radius: 12px;
  --radius-l: 18px;
  --radius-xl: 28px;

  --ease-out: cubic-bezier(0.16, 0.84, 0.24, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.25, 1);
  --dur-fast: 160ms;
  --dur: 280ms;
  --dur-slow: 900ms;

  --shadow-float: 0 30px 80px -30px rgba(0, 0, 0, 0.65), 0 1px 0 rgba(255, 255, 255, 0.04) inset;

  color-scheme: dark;
}

/* Theme contexts. Components read these semantic variables, so any section can
   switch theme with a single class. Dark is the default. */
:root,
.theme-dark {
  --bg: var(--ink-900);
  --fg: var(--text);
  --fg-2: var(--text-2);
  --fg-3: var(--text-3);
  --rule: var(--line-d1);
  --rule-2: var(--line-d2);
  --rule-3: var(--line-d3);
  --accent: var(--cyan-400);
  --accent-strong: var(--cyan-300);
  --accent-ink: var(--ink-950);
  --warm: var(--amber-400);
  --surface: var(--ink-850);
  --surface-2: var(--ink-800);
  --surface-3: var(--ink-750);
  --field-bg: rgba(5, 9, 17, 0.6);
  --danger: var(--danger-dark);
  --success: var(--success-dark);
}
.theme-deep {
  --bg: var(--ink-950);
  --surface: var(--ink-900);
  --surface-2: var(--ink-850);
  --surface-3: var(--ink-800);
}
.theme-light {
  color-scheme: light;
  --bg: var(--fog-50);
  --fg: var(--ink-text);
  --fg-2: var(--ink-text-2);
  --fg-3: var(--ink-text-3);
  --rule: var(--line-l1);
  --rule-2: var(--line-l2);
  --rule-3: var(--line-l3);
  --accent: var(--teal-700);
  --accent-strong: #075860;
  --accent-ink: var(--fog-0);
  --warm: var(--amber-700);
  --surface: var(--fog-0);
  --surface-2: var(--fog-100);
  --surface-3: var(--fog-200);
  --field-bg: var(--fog-0);
  --danger: var(--danger-light);
  --success: var(--success-light);
}
.theme-dark,
.theme-deep,
.theme-light {
  background-color: var(--bg);
  color: var(--fg);
}

/* ---------- Reset / base ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}
html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-padding-top: calc(var(--header-h) + 24px);
}
@media (prefers-reduced-motion: no-preference) {
  html {
    scroll-behavior: smooth;
  }
}
body {
  margin: 0;
  min-height: 100vh;
  background: var(--ink-900);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: var(--step-0);
  line-height: 1.6;
  font-feature-settings: 'cv11', 'ss01', 'ss03';
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
html.nav-open body {
  overflow: hidden;
}
img,
svg,
video,
canvas {
  display: block;
  max-width: 100%;
}
img {
  height: auto;
}
h1,
h2,
h3,
h4,
h5,
h6,
p,
ul,
ol,
dl,
figure,
blockquote {
  margin: 0;
}
ul[role='list'],
ol[role='list'] {
  list-style: none;
  padding: 0;
}
a {
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}
button,
input,
select,
textarea {
  font: inherit;
  color: inherit;
}
button {
  cursor: pointer;
}
:where(button, [role='button']) {
  -webkit-tap-highlight-color: transparent;
}
::selection {
  background: rgba(70, 219, 232, 0.32);
  color: #fff;
}
.theme-light ::selection {
  background: rgba(10, 106, 115, 0.2);
  color: var(--ink-text);
}
:focus-visible {
  outline: 2px solid var(--cyan-400);
  outline-offset: 3px;
  border-radius: 3px;
}
.theme-light :focus-visible {
  outline-color: var(--teal-700);
}
hr {
  border: 0;
  border-top: 1px solid var(--rule);
  margin: 0;
}
[hidden] {
  display: none !important;
}

.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}
.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 200;
  padding: 10px 16px;
  border-radius: var(--radius-s);
  background: var(--cyan-400);
  color: var(--ink-950);
  font-weight: 600;
  text-decoration: none;
  transform: translateY(-160%);
  transition: transform var(--dur) var(--ease-out);
}
.skip-link:focus-visible {
  transform: none;
}

/* ---------- Typography ---------- */
.display,
.display-xl,
.display-l,
.display-m,
.display-s {
  font-family: var(--font-display);
  font-weight: 400;
  line-height: 1.02;
  letter-spacing: -0.012em;
  color: var(--fg);
  text-wrap: balance;
}
.display-xl {
  font-size: var(--step-6);
  line-height: 0.98;
  letter-spacing: -0.02em;
}
.display-l {
  font-size: var(--step-5);
  letter-spacing: -0.018em;
}
.display-m {
  font-size: var(--step-4);
}
.display-s {
  font-size: var(--step-3);
  line-height: 1.08;
}
:is(.display, .display-xl, .display-l, .display-m, .display-s) em {
  font-style: italic;
  color: var(--accent-strong);
}
.theme-light :is(.display, .display-xl, .display-l, .display-m, .display-s) em {
  color: var(--accent);
}
.h-sans {
  font-family: var(--font-sans);
  font-size: var(--step-1);
  font-weight: 560;
  line-height: 1.3;
  letter-spacing: -0.005em;
  color: var(--fg);
}
.h-sans-s {
  font-family: var(--font-sans);
  font-size: var(--step-0);
  font-weight: 600;
  line-height: 1.35;
  color: var(--fg);
}
.lede {
  font-size: var(--step-1);
  line-height: 1.6;
  color: var(--fg-2);
  max-width: 58ch;
  text-wrap: pretty;
}
.body-l {
  font-size: var(--step-1);
  line-height: 1.65;
  color: var(--fg-2);
}
.muted {
  color: var(--fg-2);
}
.dim {
  color: var(--fg-3);
}
.mono {
  font-family: var(--font-mono);
  font-size: 0.86em;
  letter-spacing: 0.01em;
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.85em;
  font-family: var(--font-mono);
  font-size: var(--step--2);
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  line-height: 1.4;
}
.eyebrow::before {
  content: '';
  width: 28px;
  height: 1px;
  background: currentColor;
  opacity: 0.75;
  flex: none;
}
.eyebrow--plain::before {
  display: none;
}
.eyebrow--warm {
  color: var(--warm);
}
.label {
  font-family: var(--font-mono);
  font-size: var(--step--2);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fg-3);
}
.text-link {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-color: color-mix(in srgb, currentColor 40%, transparent);
  transition: text-decoration-color var(--dur-fast);
}
.text-link:hover {
  text-decoration-color: currentColor;
}
.stack > * + * {
  margin-top: var(--stack, 1.25rem);
}
.stack-s > * + * {
  margin-top: 0.75rem;
}
.stack-l > * + * {
  margin-top: 2rem;
}

/* ---------- Layout ---------- */
.container {
  width: min(100% - 2 * var(--gutter), var(--container));
  margin-inline: auto;
}
.container--narrow {
  width: min(100% - 2 * var(--gutter), var(--container-narrow));
}
.container--prose {
  width: min(100% - 2 * var(--gutter), var(--container-prose));
}
.section {
  position: relative;
  padding-block: var(--section-y);
}
.section--tight {
  padding-block: var(--section-y-tight);
}
.section--flush-top {
  padding-top: 0;
}
.section--flush-bottom {
  padding-bottom: 0;
}
.section--rule-top {
  border-top: 1px solid var(--rule);
}

.section-head {
  display: grid;
  gap: var(--space-5) var(--space-7);
  margin-bottom: clamp(40px, 6vw, 88px);
}
.section-head__title {
  max-width: 16ch;
}
.section-head__intro {
  max-width: 52ch;
  color: var(--fg-2);
  font-size: var(--step-1);
  line-height: 1.6;
}
@media (min-width: 960px) {
  .section-head {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
  }
  .section-head--stacked {
    grid-template-columns: 1fr;
  }
}

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--space-6);
}
.split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(36px, 6vw, 96px);
  align-items: center;
}
@media (min-width: 960px) {
  .split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }
  .split--media-wide {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }
  .split--text-wide {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }
  .split--reverse > :first-child {
    order: 2;
  }
  .split--top {
    align-items: start;
  }
}

/* Columns separated by hairlines — the preferred alternative to card grids. */
.cols {
  display: grid;
  gap: var(--space-7) var(--space-6);
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 250px), 1fr));
}
.cols--2 {
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 340px), 1fr));
}
.col {
  padding-top: var(--space-5);
  border-top: 1px solid var(--rule-2);
}
.col__index {
  display: block;
  margin-bottom: var(--space-5);
  font-family: var(--font-mono);
  font-size: var(--step--2);
  letter-spacing: 0.14em;
  color: var(--fg-3);
}
.col h3 {
  margin-bottom: var(--space-3);
}
.col p {
  color: var(--fg-2);
}

/* Numbered rows with hairline rules. */
.rule-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--rule-2);
}
.rule-list > li {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: var(--space-3) var(--space-5);
  padding-block: clamp(24px, 3vw, 40px);
  border-bottom: 1px solid var(--rule-2);
}
.rule-list__num {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  color: var(--fg-3);
  padding-top: 0.45em;
}
.rule-list__title {
  font-family: var(--font-display);
  font-size: var(--step-3);
  line-height: 1.1;
  color: var(--fg);
}
.rule-list__body {
  grid-column: 2;
  color: var(--fg-2);
  max-width: 60ch;
}
@media (min-width: 960px) {
  .rule-list > li {
    grid-template-columns: 120px minmax(0, 5fr) minmax(0, 6fr);
    align-items: baseline;
  }
  .rule-list__body {
    grid-column: 3;
  }
}

/* Definition rows (spec-sheet feel). */
.spec {
  display: grid;
  border-top: 1px solid var(--rule-2);
}
.spec > div {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px 24px;
  padding-block: 18px;
  border-bottom: 1px solid var(--rule);
}
.spec dt {
  font-family: var(--font-mono);
  font-size: var(--step--2);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fg-3);
}
.spec dd {
  margin: 0;
  color: var(--fg-2);
}
@media (min-width: 720px) {
  .spec > div {
    grid-template-columns: minmax(160px, 1fr) minmax(0, 2.4fr);
  }
}

/* ---------- Buttons & links ---------- */
.btn {
  --btn-h: 50px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6em;
  min-height: var(--btn-h);
  padding: 0 24px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 560;
  line-height: 1.1;
  letter-spacing: 0.002em;
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
  transition:
    background-color var(--dur) var(--ease-out),
    border-color var(--dur) var(--ease-out),
    color var(--dur) var(--ease-out),
    transform var(--dur) var(--ease-out);
}
.btn .icon {
  transition: transform var(--dur) var(--ease-out);
}
.btn:hover .icon {
  transform: translateX(3px);
}
.btn:active {
  transform: translateY(1px);
}
.btn--primary {
  background: var(--cyan-400);
  color: var(--ink-950);
}
.btn--primary:hover {
  background: var(--cyan-300);
}
.theme-light .btn--primary {
  background: var(--ink-900);
  color: var(--fog-0);
}
.theme-light .btn--primary:hover {
  background: var(--ink-700);
}
.btn--ghost {
  border-color: var(--rule-3);
  color: var(--fg);
  background: transparent;
}
.btn--ghost:hover {
  border-color: var(--accent);
  color: var(--accent-strong);
}
.theme-light .btn--ghost:hover {
  color: var(--accent);
}
.btn--warm {
  background: var(--amber-400);
  color: var(--ink-950);
}
.btn--warm:hover {
  background: var(--amber-300);
}
.btn--sm {
  --btn-h: 40px;
  padding: 0 16px;
  font-size: 0.875rem;
}
.btn--block {
  width: 100%;
}
.btn[disabled],
.btn[aria-disabled='true'] {
  opacity: 0.55;
  cursor: not-allowed;
}
.btn-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3) var(--space-4);
}
.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  color: var(--fg);
  font-weight: 560;
  text-decoration: none;
  border-bottom: 1px solid var(--rule-3);
  padding-bottom: 3px;
  transition:
    border-color var(--dur) var(--ease-out),
    color var(--dur) var(--ease-out);
}
.link-arrow .icon {
  transition: transform var(--dur) var(--ease-out);
}
.link-arrow:hover {
  border-color: var(--accent);
  color: var(--accent-strong);
}
.theme-light .link-arrow:hover {
  color: var(--accent);
}
.link-arrow:hover .icon {
  transform: translateX(4px);
}

/* ---------- Tags / chips ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border: 1px solid var(--rule-2);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: var(--step--2);
  letter-spacing: 0.06em;
  color: var(--fg-2);
  white-space: nowrap;
}
.tag--accent {
  border-color: color-mix(in srgb, var(--accent) 45%, transparent);
  color: var(--accent);
}
.tag--warm {
  border-color: color-mix(in srgb, var(--warm) 45%, transparent);
  color: var(--warm);
}
.dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  flex: none;
}
.dot--warm {
  background: var(--warm);
}
.dot--muted {
  background: var(--fg-3);
}

/* ---------- Media frames & HUD overlays ---------- */
.frame {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-l);
  background:
    radial-gradient(120% 80% at 70% 20%, rgba(70, 219, 232, 0.08), transparent 60%),
    linear-gradient(180deg, #0f1c33, #0a1120);
  isolation: isolate;
}
.frame > img,
.frame > picture > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition:
    opacity 900ms var(--ease-out),
    transform 1400ms var(--ease-out);
}
.frame > img.is-pending {
  opacity: 0;
  transform: scale(1.02);
}
.frame--16x9 {
  aspect-ratio: 16 / 9;
}
.frame--3x2 {
  aspect-ratio: 3 / 2;
}
.frame--4x3 {
  aspect-ratio: 4 / 3;
}
.frame--4x5 {
  aspect-ratio: 4 / 5;
}
.frame--21x9 {
  aspect-ratio: 21 / 9;
}
.frame--square {
  aspect-ratio: 1;
}
.frame--bleed {
  border-radius: 0;
}
.frame__shade {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(180deg, rgba(5, 9, 17, 0) 45%, rgba(5, 9, 17, 0.72) 100%);
}
/* Precise corner ticks drawn with gradients. */
.ticks {
  position: absolute;
  inset: 14px;
  pointer-events: none;
  --t: 16px;
  --c: rgba(126, 234, 243, 0.75);
  background:
    linear-gradient(var(--c), var(--c)) top left / var(--t) 1px no-repeat,
    linear-gradient(var(--c), var(--c)) top left / 1px var(--t) no-repeat,
    linear-gradient(var(--c), var(--c)) top right / var(--t) 1px no-repeat,
    linear-gradient(var(--c), var(--c)) top right / 1px var(--t) no-repeat,
    linear-gradient(var(--c), var(--c)) bottom left / var(--t) 1px no-repeat,
    linear-gradient(var(--c), var(--c)) bottom left / 1px var(--t) no-repeat,
    linear-gradient(var(--c), var(--c)) bottom right / var(--t) 1px no-repeat,
    linear-gradient(var(--c), var(--c)) bottom right / 1px var(--t) no-repeat;
}
.hud {
  position: absolute;
  z-index: 2;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  border: 1px solid rgba(126, 234, 243, 0.34);
  border-radius: var(--radius-xs);
  background: rgba(5, 9, 17, 0.66);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  color: #e6fbfd;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  line-height: 1.3;
  white-space: nowrap;
}
.hud::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cyan-400);
  box-shadow: 0 0 0 3px rgba(70, 219, 232, 0.18);
  flex: none;
}
.hud--warm {
  border-color: rgba(245, 180, 84, 0.45);
}
.hud--warm::before {
  background: var(--amber-400);
  box-shadow: 0 0 0 3px rgba(245, 180, 84, 0.18);
}
.hud--plain::before {
  display: none;
}
.hud-box {
  position: absolute;
  z-index: 1;
  border: 1px solid rgba(126, 234, 243, 0.85);
  border-radius: 2px;
  box-shadow:
    0 0 0 1px rgba(5, 9, 17, 0.35),
    inset 0 0 0 1px rgba(5, 9, 17, 0.2);
  pointer-events: none;
}
.hud-box--warm {
  border-color: rgba(245, 180, 84, 0.9);
}
.figure-caption {
  margin-top: var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--step--2);
  letter-spacing: 0.08em;
  color: var(--fg-3);
}

/* Hairline grid texture for deep sections and bands. */
.gridlines {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(160, 185, 215, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(160, 185, 215, 0.06) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, #000 30%, transparent 75%);
  mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, #000 30%, transparent 75%);
}

/* ---------- Panels (for genuinely contained UI, not marketing card walls) ---------- */
.panel {
  position: relative;
  border: 1px solid var(--rule-2);
  border-radius: var(--radius-l);
  background: var(--surface);
}
.panel--glass {
  background: rgba(10, 17, 32, 0.72);
  -webkit-backdrop-filter: blur(18px) saturate(1.2);
  backdrop-filter: blur(18px) saturate(1.2);
  box-shadow: var(--shadow-float);
}
.callout {
  position: relative;
  padding: var(--space-5) var(--space-5) var(--space-5) calc(var(--space-5) + 2px);
  border: 1px solid var(--rule-2);
  border-left: 2px solid var(--accent);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: color-mix(in srgb, var(--surface) 70%, transparent);
  color: var(--fg-2);
}
.callout--warm {
  border-left-color: var(--warm);
}
.callout strong {
  color: var(--fg);
}

/* ---------- Header ---------- */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  height: var(--header-h);
  color: var(--text);
  transition:
    background-color var(--dur) var(--ease-out),
    border-color var(--dur) var(--ease-out),
    transform 420ms var(--ease-out);
  border-bottom: 1px solid transparent;
}
.site-header[data-scrolled='true'],
html.nav-open .site-header {
  background: rgba(6, 10, 19, 0.82);
  -webkit-backdrop-filter: blur(16px) saturate(1.3);
  backdrop-filter: blur(16px) saturate(1.3);
  border-bottom-color: var(--line-d1);
}
.site-header__inner {
  height: 100%;
  display: flex;
  align-items: center;
  gap: var(--space-6);
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text);
  flex: none;
}
.brand__word {
  font-family: var(--font-sans);
  font-size: 1.12rem;
  font-weight: 620;
  letter-spacing: -0.01em;
}
.brand__word span {
  color: var(--cyan-400);
  font-weight: 500;
}
.brand-mark {
  flex: none;
}
.site-nav {
  display: none;
  margin-left: auto;
}
.site-nav__list {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.site-nav__item {
  position: relative;
}
.site-nav__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  height: 40px;
  padding: 0 14px;
  border: 0;
  border-radius: 999px;
  background: none;
  color: var(--text-2);
  font-size: 0.92rem;
  font-weight: 500;
  text-decoration: none;
  transition:
    color var(--dur-fast),
    background-color var(--dur-fast);
}
.site-nav__link:hover,
.site-nav__link[aria-expanded='true'] {
  color: var(--text);
  background: rgba(160, 185, 215, 0.08);
}
.site-nav__link[aria-current='page'],
.site-nav__link.is-current {
  color: var(--text);
}
.site-nav__link[aria-current='page']::after,
.site-nav__link.is-current::after {
  content: '';
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 4px;
  height: 1px;
  background: var(--cyan-400);
}
.site-nav__link .icon {
  transition: transform var(--dur) var(--ease-out);
}
.site-nav__link[aria-expanded='true'] .icon {
  transform: rotate(180deg);
}
.site-nav__menu {
  position: absolute;
  top: calc(100% + 10px);
  left: -12px;
  width: 360px;
  padding: 8px;
  border: 1px solid var(--line-d2);
  border-radius: var(--radius-l);
  background: rgba(10, 17, 32, 0.96);
  -webkit-backdrop-filter: blur(18px);
  backdrop-filter: blur(18px);
  box-shadow: var(--shadow-float);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  transition:
    opacity var(--dur) var(--ease-out),
    transform var(--dur) var(--ease-out),
    visibility 0s linear var(--dur);
}
.site-nav__menu[data-open='true'] {
  opacity: 1;
  visibility: visible;
  transform: none;
  transition:
    opacity var(--dur) var(--ease-out),
    transform var(--dur) var(--ease-out),
    visibility 0s;
}
.site-nav__menu ul {
  list-style: none;
  margin: 0;
  padding: 0;
}
.site-nav__menu a {
  display: grid;
  gap: 2px;
  padding: 12px 14px;
  border-radius: var(--radius);
  text-decoration: none;
  transition: background-color var(--dur-fast);
}
.site-nav__menu a:hover,
.site-nav__menu a:focus-visible {
  background: rgba(160, 185, 215, 0.08);
}
.site-nav__menu a[aria-current='page'] {
  background: rgba(70, 219, 232, 0.08);
}
.site-nav__menu-label {
  color: var(--text);
  font-weight: 560;
  font-size: 0.95rem;
}
.site-nav__menu-note {
  color: var(--text-3);
  font-size: 0.84rem;
  line-height: 1.4;
}
.site-header__actions {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-left: auto;
}
.site-header__actions .btn--ghost {
  display: none;
}
.nav-toggle {
  display: inline-grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border: 1px solid var(--line-d2);
  border-radius: 999px;
  background: transparent;
  color: var(--text);
}
.nav-toggle .icon-close {
  display: none;
}
html.nav-open .nav-toggle .icon-menu {
  display: none;
}
html.nav-open .nav-toggle .icon-close {
  display: block;
}
@media (max-width: 479px) {
  .site-header__actions .btn--primary {
    display: none;
  }
}
@media (min-width: 1080px) {
  .site-nav {
    display: block;
  }
  .site-header__actions {
    margin-left: var(--space-4);
  }
  .site-header__actions .btn--ghost {
    display: inline-flex;
  }
  .nav-toggle {
    display: none;
  }
}

/* Mobile navigation */
.mobile-nav {
  position: fixed;
  inset: var(--header-h) 0 0 0;
  z-index: 99;
  overflow-y: auto;
  overscroll-behavior: contain;
  padding: var(--space-6) var(--gutter) var(--space-8);
  background: var(--ink-950);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition:
    opacity var(--dur) var(--ease-out),
    transform var(--dur) var(--ease-out),
    visibility 0s linear var(--dur);
}
html.nav-open .mobile-nav {
  opacity: 1;
  visibility: visible;
  transform: none;
  transition:
    opacity var(--dur) var(--ease-out),
    transform var(--dur) var(--ease-out),
    visibility 0s;
}
.mobile-nav__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line-d1);
}
.mobile-nav__list > li {
  border-bottom: 1px solid var(--line-d1);
}
.mobile-nav__link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 0;
  font-family: var(--font-display);
  font-size: 2rem;
  line-height: 1.1;
  color: var(--text);
  text-decoration: none;
}
.mobile-nav__link[aria-current='page'] {
  color: var(--cyan-300);
}
.mobile-nav__sub {
  list-style: none;
  margin: -6px 0 16px;
  padding: 0;
  display: grid;
  gap: 2px;
}
.mobile-nav__sub a {
  display: block;
  padding: 8px 0 8px 18px;
  border-left: 1px solid var(--line-d2);
  color: var(--text-2);
  text-decoration: none;
}
.mobile-nav__sub a[aria-current='page'] {
  color: var(--cyan-300);
  border-left-color: var(--cyan-400);
}
.mobile-nav__actions {
  display: grid;
  gap: 12px;
  margin-top: var(--space-6);
}
@media (min-width: 1080px) {
  .mobile-nav {
    display: none;
  }
}

/* ---------- Page hero (interior pages) ---------- */
.page-hero {
  position: relative;
  padding-top: calc(var(--header-h) + clamp(56px, 9vw, 136px));
  padding-bottom: clamp(56px, 7vw, 104px);
  overflow: hidden;
}
.page-hero__inner {
  position: relative;
  z-index: 1;
}
.page-hero__title {
  margin-top: var(--space-5);
  max-width: 15ch;
}
.page-hero__lede {
  margin-top: var(--space-5);
}
.page-hero__actions {
  margin-top: var(--space-6);
}
.page-hero--image {
  min-height: min(88vh, 860px);
  display: flex;
  align-items: flex-end;
}
.page-hero__media {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.page-hero__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.page-hero__media::after {
  content: '';
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(5, 9, 17, 0.72) 0%, rgba(5, 9, 17, 0.2) 34%, rgba(5, 9, 17, 0.55) 68%, var(--ink-900) 100%),
    linear-gradient(90deg, rgba(5, 9, 17, 0.75) 0%, rgba(5, 9, 17, 0.15) 60%);
}

/* ---------- Breadcrumbs ---------- */
.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 10px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: var(--step--2);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--fg-3);
}
.breadcrumbs li + li::before {
  content: '/';
  margin-right: 10px;
  opacity: 0.5;
}
.breadcrumbs a {
  color: var(--fg-2);
  text-decoration: none;
}
.breadcrumbs a:hover {
  color: var(--accent);
}

/* ---------- CTA band ---------- */
.cta-band {
  position: relative;
  overflow: hidden;
  padding-block: clamp(88px, 12vw, 176px);
  background: var(--ink-950);
  border-top: 1px solid var(--line-d1);
}
.cta-band__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: var(--space-6);
  justify-items: start;
}
.cta-band__title {
  max-width: 17ch;
}
.cta-band__body {
  max-width: 54ch;
}
.cta-band__glow {
  position: absolute;
  right: -10%;
  bottom: -40%;
  width: 70vmax;
  height: 70vmax;
  border-radius: 50%;
  background: radial-gradient(closest-side, rgba(31, 194, 209, 0.13), transparent 70%);
  pointer-events: none;
}

/* ---------- Prose (guides, legal) ---------- */
.prose {
  font-size: 1.075rem;
  line-height: 1.78;
  color: var(--fg-2);
}
.prose > * + * {
  margin-top: 1.15em;
}
.prose h2 {
  margin-top: 2.4em;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: var(--step-3);
  line-height: 1.12;
  letter-spacing: -0.01em;
  color: var(--fg);
  text-wrap: balance;
}
.prose h3 {
  margin-top: 2em;
  font-size: 1.18rem;
  font-weight: 600;
  line-height: 1.35;
  color: var(--fg);
}
.prose h2 + *,
.prose h3 + * {
  margin-top: 0.75em;
}
.prose strong {
  color: var(--fg);
  font-weight: 600;
}
.prose a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-color: color-mix(in srgb, currentColor 40%, transparent);
}
.prose a:hover {
  text-decoration-color: currentColor;
}
.prose ul,
.prose ol {
  padding-left: 1.3em;
}
.prose li + li {
  margin-top: 0.5em;
}
.prose li::marker {
  color: var(--accent);
}
.prose ol li::marker {
  font-family: var(--font-mono);
  font-size: 0.85em;
}
.prose blockquote {
  padding-left: 1.2em;
  border-left: 2px solid var(--accent);
  font-family: var(--font-display);
  font-size: var(--step-2);
  line-height: 1.35;
  color: var(--fg);
}
.prose code {
  font-family: var(--font-mono);
  font-size: 0.86em;
  padding: 0.12em 0.4em;
  border-radius: 4px;
  background: var(--surface-2);
  color: var(--fg);
}
.prose table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
  line-height: 1.5;
}
.prose th,
.prose td {
  text-align: left;
  vertical-align: top;
  padding: 12px 14px 12px 0;
  border-bottom: 1px solid var(--rule-2);
}
.prose th {
  font-family: var(--font-mono);
  font-size: var(--step--2);
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--fg-3);
}
.prose .table-wrap {
  overflow-x: auto;
}
.prose hr {
  margin-block: 2.5em;
}
.prose .callout {
  margin-block: 1.8em;
}
.prose figure {
  margin-block: 2em;
}

/* ---------- Forms ---------- */
.form {
  display: grid;
  gap: var(--space-5);
}
.form-row {
  display: grid;
  gap: var(--space-5);
}
@media (min-width: 720px) {
  .form-row--2 {
    grid-template-columns: 1fr 1fr;
  }
}
.field {
  display: grid;
  gap: 8px;
}
.field__label {
  font-size: 0.9rem;
  font-weight: 560;
  color: var(--fg);
}
.field__label .optional {
  font-weight: 400;
  color: var(--fg-3);
}
.field__hint {
  font-size: 0.85rem;
  color: var(--fg-3);
}
.input,
.select,
.textarea {
  width: 100%;
  min-height: 50px;
  padding: 12px 14px;
  border: 1px solid var(--rule-2);
  border-radius: var(--radius-s);
  background: var(--field-bg);
  color: var(--fg);
  font-size: 1rem;
  line-height: 1.4;
  transition:
    border-color var(--dur-fast),
    box-shadow var(--dur-fast);
}
.textarea {
  min-height: 140px;
  resize: vertical;
}
.select {
  appearance: none;
  padding-right: 42px;
  background-image:
    linear-gradient(45deg, transparent 50%, currentColor 50%),
    linear-gradient(135deg, currentColor 50%, transparent 50%);
  background-position:
    calc(100% - 20px) 52%,
    calc(100% - 15px) 52%;
  background-size: 5px 5px;
  background-repeat: no-repeat;
}
.input::placeholder,
.textarea::placeholder {
  color: var(--fg-3);
}
.input:hover,
.select:hover,
.textarea:hover {
  border-color: var(--rule-3);
}
.input:focus,
.select:focus,
.textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 22%, transparent);
}
.field[data-invalid='true'] :is(.input, .select, .textarea) {
  border-color: var(--danger);
}
.field__error {
  font-size: 0.86rem;
  color: var(--danger);
}
.choice-group {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  border: 0;
  margin: 0;
  padding: 0;
}
.choice {
  position: relative;
}
.choice input {
  position: absolute;
  opacity: 0;
  inset: 0;
  margin: 0;
  cursor: pointer;
}
.choice span {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 16px;
  border: 1px solid var(--rule-2);
  border-radius: 999px;
  color: var(--fg-2);
  font-size: 0.92rem;
  transition:
    border-color var(--dur-fast),
    color var(--dur-fast),
    background-color var(--dur-fast);
}
.choice input:checked + span {
  border-color: var(--accent);
  color: var(--fg);
  background: color-mix(in srgb, var(--accent) 12%, transparent);
}
.choice input:focus-visible + span {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
.checkbox {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  font-size: 0.92rem;
  color: var(--fg-2);
}
.checkbox input {
  width: 18px;
  height: 18px;
  margin-top: 3px;
  accent-color: var(--cyan-500);
  flex: none;
}
.form-status {
  padding: var(--space-4) var(--space-5);
  border: 1px solid var(--rule-2);
  border-radius: var(--radius);
  font-size: 0.95rem;
}
.form-status--error {
  border-color: color-mix(in srgb, var(--danger) 55%, transparent);
  color: var(--fg);
}
.form-status--success {
  border-color: color-mix(in srgb, var(--success) 55%, transparent);
}

/* ---------- Footer ---------- */
.site-footer {
  position: relative;
  padding-top: clamp(64px, 8vw, 112px);
  padding-bottom: var(--space-6);
  background: var(--ink-1000);
  border-top: 1px solid var(--line-d1);
  color: var(--text-2);
  font-size: 0.95rem;
}
.site-footer__top {
  display: grid;
  gap: var(--space-8);
}
.site-footer__brand p {
  max-width: 34ch;
  margin-top: var(--space-4);
}
.site-footer__brand .brand {
  margin-bottom: 4px;
}
.site-footer__contact {
  display: inline-flex;
  margin-top: var(--space-5);
}
.site-footer__nav {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-7) var(--space-6);
}
.site-footer__nav h2 {
  margin-bottom: var(--space-4);
  font-family: var(--font-mono);
  font-size: var(--step--2);
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-3);
}
.site-footer__nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}
.site-footer__nav a {
  color: var(--text-2);
  text-decoration: none;
  transition: color var(--dur-fast);
}
.site-footer__nav a:hover {
  color: var(--text);
}
.site-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3) var(--space-6);
  justify-content: space-between;
  margin-top: clamp(56px, 7vw, 96px);
  padding-top: var(--space-5);
  border-top: 1px solid var(--line-d1);
  font-size: 0.85rem;
  color: var(--text-3);
}
.site-footer__legal {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-5);
  list-style: none;
  margin: 0;
  padding: 0;
}
.site-footer__legal a {
  color: var(--text-3);
  text-decoration: none;
}
.site-footer__legal a:hover {
  color: var(--text);
}
.site-footer__note {
  flex-basis: 100%;
  max-width: 80ch;
  font-size: 0.8rem;
  line-height: 1.55;
  color: var(--text-3);
}
@media (min-width: 900px) {
  .site-footer__top {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
  }
  .site-footer__nav {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- Motion ---------- */
/* Reveal styles only hide content while JS is active and the fail-open
   fallback (set by boot.js if site.js never confirms setup) has not fired. */
@media (prefers-reduced-motion: no-preference) {
  html.js:not(.reveal-fallback) [data-reveal] {
    opacity: 0;
    transform: translate3d(0, 28px, 0);
    transition:
      opacity var(--dur-slow) var(--ease-out),
      transform var(--dur-slow) var(--ease-out);
    transition-delay: calc(var(--i, 0) * 90ms);
  }
  html.js:not(.reveal-fallback) [data-reveal='fade'] {
    transform: none;
  }
  html.js:not(.reveal-fallback) [data-reveal='scale'] {
    transform: scale(0.97);
  }
  html.js:not(.reveal-fallback) [data-reveal].is-visible {
    opacity: 1;
    transform: none;
  }
  [data-parallax] {
    will-change: transform;
  }
}
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ---------- Utilities ---------- */
.mt-0 {
  margin-top: 0 !important;
}
.mt-s {
  margin-top: var(--space-4);
}
.mt-m {
  margin-top: var(--space-6);
}
.mt-l {
  margin-top: var(--space-8);
}
.center {
  text-align: center;
}
.nowrap {
  white-space: nowrap;
}
.max-ch {
  max-width: 60ch;
}
.relative {
  position: relative;
}