/* LBSS: the action card. Two inks (petrol, hi-vis) on laminate white. */

@font-face {
  font-family: "Archivo";
  src: url("../fonts/archivo-latin.woff2") format("woff2");
  font-weight: 100 900;
  font-stretch: 62% 125%;
  font-style: normal;
  font-display: swap;
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

@font-face {
  font-family: "Archivo";
  src: url("../fonts/archivo-latin-ext.woff2") format("woff2");
  font-weight: 100 900;
  font-stretch: 62% 125%;
  font-style: normal;
  font-display: swap;
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}

:root {
  --stock: #fbfcfb;
  --ink: #0f2a33;
  --ink-2: color-mix(in oklab, var(--ink) 74%, var(--stock));
  --ink-3: color-mix(in oklab, var(--ink) 55%, var(--stock));
  --hairline: color-mix(in oklab, var(--ink) 18%, var(--stock));
  --signal: #ddf23c;

  --font: "Archivo", "Segoe UI", system-ui, sans-serif;

  --step--1: 0.875rem;
  --step-0: 1.125rem;
  --step-1: clamp(1.125rem, 1.05rem + 0.3vw, 1.3125rem);
  --step-2: clamp(1.3125rem, 1.2rem + 0.5vw, 1.625rem);
  --step-4: clamp(2rem, 1.35rem + 2.6vw, 3.5rem);
  --step-5: clamp(2.6rem, 1.5rem + 4.2vw, 5rem);

  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4rem;
  --space-9: 6rem;
  --section: clamp(4.5rem, 2.5rem + 6vw, 8.5rem);
  --gutter: clamp(1rem, 0.4rem + 2.6vw, 3rem);

  --rule: 2px solid var(--ink);
  --r-card: 22px;
  --r-control: 12px;
  --check: 7px;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

/* Base */

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  scrollbar-color: var(--ink) var(--stock);
}

body {
  display: flex;
  flex-direction: column;
  min-height: 100svh;
  margin: 0;
  background: var(--stock);
  color: var(--ink);
  font-family: var(--font);
  font-size: var(--step-0);
  font-stretch: 100%;
  line-height: 1.55;
  caret-color: var(--ink);
  font-kerning: normal;
  -webkit-font-smoothing: antialiased;
}

::selection {
  background: var(--signal);
  color: var(--ink);
}

main {
  flex: 1;
}

h1, h2, h3, p, ul, dl, dd, figure {
  margin: 0;
}

h1, h2, h3 {
  line-height: 1.1;
  text-wrap: balance;
}

p {
  text-wrap: pretty;
}

ul {
  padding: 0;
  list-style: none;
}

svg {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration-thickness: 2px;
  text-underline-offset: 0.22em;
}

:focus-visible {
  outline: 3px solid var(--ink);
  outline-offset: 3px;
  border-radius: 4px;
}

.wrap {
  width: 100%;
  max-width: 1360px;
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.skip {
  position: absolute;
  top: var(--space-4);
  left: var(--space-4);
  z-index: 10;
  padding: var(--space-3) var(--space-4);
  border: var(--rule);
  border-radius: var(--r-control);
  background: var(--signal);
  font-weight: 700;
  transform: translateY(-200%);
}

.skip:focus {
  transform: none;
}

/* The chequer band: two rows of ink and hi-vis, the one piece of livery. */
.band {
  height: calc(var(--check) * 2);
  background: repeating-conic-gradient(var(--ink) 0 25%, var(--signal) 0 50%) 0 0 / calc(var(--check) * 2) calc(var(--check) * 2);
}

/* Brand */

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--ink);
  text-decoration: none;
}

.brand__mark {
  width: 22px;
  height: 22px;
  border-radius: 5px;
  background: repeating-conic-gradient(var(--ink) 0 25%, var(--signal) 0 50%) 0 0 / 22px 22px;
  box-shadow: inset 0 0 0 2px var(--ink);
}

.brand__name {
  font-size: 1.375rem;
  font-weight: 850;
  font-stretch: 125%;
  letter-spacing: 0.02em;
  line-height: 1;
}

/* Buttons */

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 52px;
  padding: 0 var(--space-5);
  border: var(--rule);
  border-radius: var(--r-control);
  background: var(--ink);
  color: var(--stock);
  font: inherit;
  font-size: 1.0625rem;
  font-weight: 650;
  font-stretch: 105%;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.18s var(--ease-out), color 0.18s var(--ease-out), transform 0.16s var(--ease-out);
}

.button:hover {
  background: var(--stock);
  color: var(--ink);
}

.button:active {
  transform: scale(0.97);
}

.button--quiet {
  background: transparent;
  color: var(--ink);
}

.button--quiet:hover {
  background: var(--ink);
  color: var(--stock);
}

.button--small {
  min-height: 44px;
  padding: 0 var(--space-4);
  font-size: 0.9375rem;
}

/* Masthead */

.masthead__inner {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  min-height: 80px;
}

.masthead__nav {
  display: flex;
  gap: var(--space-6);
  margin-inline-start: auto;
  font-size: 1rem;
  font-weight: 560;
}

.masthead__nav a {
  padding-block: var(--space-2);
  text-decoration: none;
  background: linear-gradient(var(--ink), var(--ink)) 0 100% / 0 2px no-repeat;
  transition: background-size 0.3s var(--ease-out);
}

.masthead__nav a:hover {
  background-size: 100% 2px;
}

@media (max-width: 760px) {
  .masthead__nav {
    display: none;
  }

  .masthead .button {
    margin-inline-start: auto;
  }
}

/* Hero */

.hero {
  padding-block: clamp(1.5rem, 0.5rem + 4vw, 4.5rem) clamp(1rem, 0.5rem + 2vw, 2.5rem);
}

.hero__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr);
  gap: clamp(2.5rem, 1rem + 4vw, 5rem);
  align-items: center;
}

.hero__title {
  font-size: var(--step-5);
  font-weight: 820;
  font-stretch: 112%;
  line-height: 0.98;
  letter-spacing: -0.03em;
}

.hero__title span {
  display: block;
}

.hero__lead {
  max-width: 46ch;
  margin-top: var(--space-6);
  color: var(--ink-2);
  font-size: var(--step-1);
  line-height: 1.5;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-7);
}

@media (max-width: 1040px) {
  .hero__inner {
    grid-template-columns: minmax(0, 1fr);
  }

  .hero__copy {
    max-width: 44rem;
  }
}

/* The action card */

.card {
  --ring-w: 2.4;
  --ring-dash: 7 7;
  overflow: hidden;
  border: var(--rule);
  border-radius: var(--r-card);
  background: var(--stock);
}

.card__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-5) var(--space-6) 0;
}

.card__title {
  font-size: var(--step-2);
  font-weight: 780;
  font-stretch: 112%;
  letter-spacing: -0.01em;
}

.card__tag {
  flex: none;
  padding: 0.1rem var(--space-3);
  border: 1.5px dashed var(--ink-3);
  border-radius: 999px;
  color: var(--ink-2);
  font-size: var(--step--1);
  font-weight: 600;
}

.card__hint {
  padding: var(--space-2) var(--space-6) 0;
  color: var(--ink-2);
  font-size: 0.9375rem;
}

.card__body {
  display: grid;
  grid-template-columns: minmax(9.5rem, 0.8fr) minmax(0, 1.4fr);
  gap: var(--space-5);
  align-items: center;
  padding: var(--space-5) var(--space-6);
}

/* Ladder: live level filled hi-vis, contained levels solid, standby levels hollow. */

.ladder {
  display: grid;
  gap: 2px;
  min-width: 0;
  margin: 0;
  padding: 0;
  border: 0;
}

.ladder__step {
  position: relative;
  display: grid;
  grid-template-columns: 22px minmax(0, 1fr);
  column-gap: var(--space-3);
  align-items: center;
  min-height: 52px;
  padding: var(--space-2);
  border-radius: 10px;
  cursor: pointer;
  transition: background-color 0.35s var(--ease-out);
}

.ladder__step input {
  position: absolute;
  inset: 0;
  margin: 0;
  opacity: 0;
  cursor: pointer;
}

.ladder__mark {
  grid-row: 1 / span 2;
  justify-self: center;
  width: 18px;
  height: 18px;
  border: 2px solid var(--ink-3);
  border-radius: 3px;
  transform: scale(0.78);
  transition: transform 0.35s var(--ease-out), background-color 0.35s var(--ease-out), border-color 0.35s var(--ease-out);
}

.ladder__name {
  color: var(--ink-2);
  font-size: 1.0625rem;
  font-weight: 600;
  line-height: 1.2;
}

.ladder__n {
  color: var(--ink-2);
  font-size: 0.8125rem;
  line-height: 1.25;
  font-variant-numeric: tabular-nums;
}

.ladder__step:not(:last-of-type)::after {
  content: "";
  position: absolute;
  top: calc(50% + 10px);
  left: calc(var(--space-2) + 10px);
  height: calc(100% - 18px);
  border-left: 2px dashed var(--ink-3);
  pointer-events: none;
}

.ladder__step:hover .ladder__name {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 0.2em;
}

.ladder__step:has(input:focus-visible) {
  outline: 3px solid var(--ink);
  outline-offset: 1px;
}

.ladder__step:has(~ .ladder__step input:checked) .ladder__mark {
  border-color: var(--ink);
  background: var(--ink);
}

.ladder__step:has(~ .ladder__step input:checked) :is(.ladder__name, .ladder__n) {
  color: var(--ink);
}

.ladder__step:has(~ .ladder__step input:checked)::after {
  border-left-style: solid;
  border-left-color: var(--ink);
}

.ladder__step:has(input:checked) {
  background: var(--signal);
}

.ladder__step:has(input:checked) .ladder__mark {
  transform: none;
  border-color: var(--ink);
  background: var(--ink);
  box-shadow: inset 0 0 0 4px var(--signal);
}

.ladder__step:has(input:checked) .ladder__name {
  color: var(--ink);
  font-weight: 780;
}

.ladder__step:has(input:checked) .ladder__n {
  color: var(--ink);
}

/* Scope: nested outlines, live scope filled, wider scopes dashed until reached. */

.scope svg {
  width: 100%;
  height: auto;
  overflow: visible;
}

.ring {
  fill: transparent;
  stroke: var(--ink-3);
  stroke-width: var(--ring-w);
  stroke-dasharray: var(--ring-dash);
  transform-box: fill-box;
  transform-origin: center;
  transition: fill 0.5s var(--ease-out), stroke 0.4s var(--ease-out), stroke-dasharray 0.6s var(--ease-out);
  animation: ring-in 0.9s var(--ease-out) backwards;
}

.ring-2 { animation-delay: 80ms; }
.ring-3 { animation-delay: 160ms; }
.ring-4 { animation-delay: 240ms; }
.ring-5 { animation-delay: 320ms; }

.site {
  fill: var(--ink);
}

.card:has(#lvl-1:checked) .ring-1,
.card:has(#lvl-2:checked) :is(.ring-1, .ring-2),
.card:has(#lvl-3:checked) :is(.ring-1, .ring-2, .ring-3),
.card:has(#lvl-4:checked) :is(.ring-1, .ring-2, .ring-3, .ring-4),
.card:has(#lvl-5:checked) .ring {
  stroke: var(--ink);
  stroke-dasharray: 700 0;
}

.card:has(#lvl-1:checked) .ring-1,
.card:has(#lvl-2:checked) .ring-2,
.card:has(#lvl-3:checked) .ring-3,
.card:has(#lvl-4:checked) .ring-4,
.card:has(#lvl-5:checked) .ring-5 {
  fill: var(--signal);
  stroke-width: calc(var(--ring-w) * 1.25);
}

@keyframes ring-in {
  from {
    opacity: 0;
    transform: scale(0.82);
  }
}

/* Readout */

.readout {
  border-top: var(--rule);
}

.readout__row {
  display: grid;
  grid-template-columns: 9.5rem minmax(0, 1fr);
  gap: var(--space-2) var(--space-4);
  align-items: baseline;
  padding: var(--space-4) var(--space-6);
  border-bottom: 1px solid var(--hairline);
}

.readout dt {
  color: var(--ink-2);
  font-size: 0.9375rem;
}

.readout dd {
  font-size: var(--step-1);
  font-weight: 650;
  font-stretch: 104%;
  line-height: 1.3;
}

.readout [data-level] {
  display: none;
}

.card:has(#lvl-1:checked) .readout [data-level="1"],
.card:has(#lvl-2:checked) .readout [data-level="2"],
.card:has(#lvl-3:checked) .readout [data-level="3"],
.card:has(#lvl-4:checked) .readout [data-level="4"],
.card:has(#lvl-5:checked) .readout [data-level="5"] {
  display: block;
  animation: readout-in 0.45s var(--ease-out);
}

@keyframes readout-in {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
}

.card__foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3) var(--space-4);
  padding: var(--space-4) var(--space-6) var(--space-5);
}

.card__constant {
  max-width: 34ch;
  font-size: 0.9375rem;
  font-weight: 600;
}

.card:has(#lvl-1:checked) .card__standdown {
  visibility: hidden;
}

@media (max-width: 560px) {
  .card {
    --ring-w: 5;
    --ring-dash: 14 12;
  }

  .card__head,
  .card__hint,
  .card__body,
  .readout__row,
  .card__foot {
    padding-inline: var(--space-4);
  }

  .card__body {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    gap: var(--space-3);
  }

  .ladder__name {
    font-size: 1rem;
  }

  .readout__row {
    grid-template-columns: minmax(0, 1fr);
  }

  .card:has(#lvl-1:checked) .card__standdown {
    display: none;
  }
}

/* Sections */

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

.section__head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: var(--space-5) var(--space-8);
  align-items: end;
  margin-bottom: var(--space-8);
}

.section__title {
  font-size: var(--step-4);
  font-weight: 800;
  font-stretch: 112%;
  line-height: 1.02;
  letter-spacing: -0.025em;
}

.section__head p {
  max-width: 52ch;
  color: var(--ink-2);
  font-size: var(--step-1);
  line-height: 1.5;
}

@media (max-width: 860px) {
  .section__head {
    grid-template-columns: minmax(0, 1fr);
    margin-bottom: var(--space-7);
  }
}

/* Capabilities, framed as the questions teams ask */

.questions {
  border-top: var(--rule);
}

.question {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
  gap: var(--space-4) var(--space-8);
  align-items: start;
  padding-block: var(--space-7);
  border-bottom: var(--rule);
}

.question__ask {
  font-size: var(--step-4);
  font-weight: 780;
  font-stretch: 118%;
  line-height: 1.02;
  letter-spacing: -0.025em;
  text-wrap: balance;
}

.question__answer h3 {
  font-size: var(--step-2);
  font-weight: 720;
  font-stretch: 104%;
}

.question__answer p {
  max-width: 48ch;
  margin-top: var(--space-3);
  color: var(--ink-2);
}

@media (max-width: 860px) {
  .question {
    grid-template-columns: minmax(0, 1fr);
    padding-block: var(--space-6);
  }
}

/* Everyday statement: an ink field edged in livery; hi-vis stays with the live level */

.statement {
  background: var(--ink);
  color: var(--stock);
}

.statement__inner {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
  gap: var(--space-7) var(--space-8);
  align-items: end;
  padding-block: var(--section);
}

.statement__title {
  max-width: 16ch;
  font-size: var(--step-5);
  font-weight: 850;
  font-stretch: 114%;
  line-height: 0.98;
  letter-spacing: -0.03em;
}

.statement__body {
  display: grid;
  gap: var(--space-4);
  max-width: 44ch;
  color: color-mix(in oklab, var(--stock) 84%, var(--ink));
  font-size: var(--step-1);
  line-height: 1.5;
}

@media (max-width: 960px) {
  .statement__inner {
    grid-template-columns: minmax(0, 1fr);
  }
}

/* Audiences */

.audiences {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-7) var(--space-6);
}

.audiences li {
  padding-top: var(--space-5);
  border-top: var(--rule);
}

.audiences h3 {
  max-width: 18ch;
  font-size: var(--step-2);
  font-weight: 750;
  font-stretch: 106%;
  line-height: 1.15;
}

.audiences p {
  max-width: 40ch;
  margin-top: var(--space-4);
  color: var(--ink-2);
}

@media (max-width: 900px) {
  .audiences {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--space-6);
  }
}

/* Contact close */

.contact {
  background: var(--ink);
  color: var(--stock);
}

.contact ::selection {
  background: var(--signal);
  color: var(--ink);
}

.contact :focus-visible {
  outline-color: var(--signal);
}

.contact__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: var(--space-6) var(--space-8);
  align-items: end;
  padding-block: var(--section);
}

.contact__title {
  font-size: var(--step-5);
  font-weight: 820;
  font-stretch: 116%;
  line-height: 0.98;
  letter-spacing: -0.03em;
}

.contact__body p {
  max-width: 40ch;
  color: color-mix(in oklab, var(--stock) 84%, var(--ink));
  font-size: var(--step-1);
  line-height: 1.5;
}

.contact__email {
  display: inline-block;
  margin-top: var(--space-5);
  color: var(--stock);
  font-size: var(--step-4);
  font-weight: 780;
  font-stretch: 110%;
  letter-spacing: -0.02em;
  line-height: 1.1;
  text-decoration-thickness: 3px;
  text-underline-offset: 0.18em;
  transition: text-underline-offset 0.25s var(--ease-out);
}

.contact__email:hover {
  text-underline-offset: 0.28em;
}

@media (max-width: 860px) {
  .contact__inner {
    grid-template-columns: minmax(0, 1fr);
  }
}

/* Footer */

.footer__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto auto;
  gap: var(--space-5) var(--space-7);
  align-items: center;
  padding-block: var(--space-7);
}

.footer__id {
  display: grid;
  gap: var(--space-3);
}

.footer__id p,
.footer__legal {
  color: var(--ink-2);
  font-size: 0.9375rem;
}

.footer__nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-5);
  font-weight: 600;
}

@media (max-width: 760px) {
  .footer__inner {
    grid-template-columns: minmax(0, 1fr);
  }
}

/* Prose pages: privacy, errors */

.prose {
  max-width: 68ch;
  padding-block: var(--space-9) var(--section);
}

.prose__title {
  font-size: var(--step-5);
  font-weight: 820;
  font-stretch: 116%;
  line-height: 0.98;
  letter-spacing: -0.03em;
}

.prose__meta {
  margin-top: var(--space-4);
  color: var(--ink-2);
}

.prose h2 {
  margin-top: var(--space-7);
  font-size: var(--step-2);
  font-weight: 750;
}

.prose p {
  max-width: 68ch;
  margin-top: var(--space-3);
}

.prose__title + p {
  margin-top: var(--space-5);
}

.prose .button {
  margin-top: var(--space-4);
}

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

  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }
}