@layer reset, tokens, base, composition, components, responsive;

@layer reset {
  *, *::before, *::after { box-sizing: border-box; }
  html { scroll-behavior: smooth; }
  body { margin: 0; }
  img, svg { display: block; max-width: 100%; }
  button, input, textarea, select { font: inherit; }
  a { color: inherit; }
  figure, blockquote, dl, dd { margin: 0; }
}

@layer tokens {
  :root {
    --paper: #f2eee5;
    --paper-deep: #e5ded0;
    --ink: #171a17;
    --muted: #60655e;
    --signal: #17665b;
    --signal-soft: #c8ddd6;
    --signal-pale: #e4efea;
    --rust: #934c37;
    --chalk: #fffdf8;
    --rule: color-mix(in srgb, var(--ink) 18%, transparent);
    --rule-strong: color-mix(in srgb, var(--ink) 42%, transparent);
    --edge: clamp(1.1rem, 3.4vw, 3.9rem);
    --max: 92rem;
    --step--1: clamp(.78rem, .74rem + .18vw, .91rem);
    --step-0: clamp(1rem, .94rem + .3vw, 1.16rem);
    --step-1: clamp(1.32rem, 1.08rem + 1vw, 2rem);
    --step-2: clamp(2.1rem, 1.35rem + 3.35vw, 4.65rem);
    --step-3: clamp(3.5rem, 1.8rem + 7.8vw, 9.8rem);
    --step-4: clamp(4.8rem, 2rem + 12vw, 14rem);
  }
}

@layer base {
  html { scroll-padding-top: 5.2rem; }

  body {
    min-width: 20rem;
    color: var(--ink);
    background:
      linear-gradient(90deg, transparent 0 10.7%, rgba(23,26,23,.038) 10.7% 10.82%, transparent 10.82% 100%),
      var(--paper);
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    line-height: 1.6;
    text-rendering: optimizeLegibility;
  }

  h1, h2, h3, p { margin-block-start: 0; }
  h1, h2, h3 { line-height: .98; letter-spacing: -.04em; text-wrap: balance; }
  p { max-width: 71ch; }
  strong { font-weight: 720; }

  :focus-visible { outline: .18rem solid var(--rust); outline-offset: .24rem; }
  ::selection { background: var(--signal-soft); color: var(--ink); }
}

@layer composition {
  .masthead {
    position: fixed;
    inset: 0 0 auto;
    z-index: 40;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: .8rem var(--edge);
    border-bottom: 1px solid transparent;
    transition: background .2s ease, border-color .2s ease;
  }

  .masthead[data-scrolled="true"] {
    background: color-mix(in srgb, var(--paper) 92%, transparent);
    border-color: var(--rule);
    backdrop-filter: blur(14px);
  }

  main { overflow: clip; }

  .threshold,
  .mission-field,
  .profession-crossing,
  .reference-sheet,
  .orientation-field,
  .association-story,
  .identity-ledger,
  .questions-field,
  .contact-pass,
  .site-end {
    padding-inline: var(--edge);
  }

  .threshold {
    min-height: 100svh;
    padding-top: 7.8rem;
    padding-bottom: 3rem;
    display: grid;
    grid-template-columns: minmax(2rem, .18fr) minmax(20rem, 1.12fr) minmax(17rem, .72fr);
    grid-template-rows: 1fr auto;
    gap: clamp(1.5rem, 4vw, 5rem);
    align-items: center;
  }

  .threshold__quiet {
    align-self: stretch;
    justify-self: center;
    writing-mode: vertical-rl;
    transform: rotate(180deg);
    display: flex;
    align-items: center;
    justify-content: center;
    letter-spacing: .2em;
    text-transform: uppercase;
    color: var(--muted);
    font-size: var(--step--1);
  }

  .threshold__statement { max-width: 57rem; }
  .threshold__lead { max-width: 56ch; font-size: clamp(1.15rem, .98rem + .65vw, 1.6rem); }
  .threshold__visual { align-self: center; min-height: min(64svh, 46rem); }
  .threshold__actions { display: flex; flex-wrap: wrap; gap: .7rem 1.5rem; margin-top: 2rem; }
  .thread-entry { grid-column: 2 / 4; justify-self: end; display: inline-flex; align-items: center; gap: 1rem; text-decoration: none; font-size: var(--step--1); text-transform: uppercase; letter-spacing: .1em; }
  .thread-entry svg { width: 5rem; fill: none; stroke: currentColor; stroke-width: 1.5; }

  .continuity { height: clamp(8rem, 14vw, 14rem); position: relative; }
  .continuity__thread { position: absolute; left: 25%; top: 0; bottom: 0; width: 1px; background: var(--ink); transform: skewX(-13deg); transform-origin: top; }

  .mission-field {
    padding-block: clamp(5rem, 10vw, 10rem);
    position: relative;
  }

  .mission-field::before {
    content: "AIR-L";
    position: absolute;
    z-index: -1;
    right: -1vw;
    top: 1rem;
    font-size: var(--step-4);
    line-height: .75;
    font-weight: 800;
    letter-spacing: -.09em;
    color: color-mix(in srgb, var(--signal-soft) 35%, transparent);
    pointer-events: none;
  }

  .mission-field__header {
    display: grid;
    grid-template-columns: minmax(4rem, .22fr) minmax(0, 1.8fr);
    gap: clamp(1.2rem, 4vw, 4rem);
    max-width: var(--max);
    margin-inline: auto;
  }

  .mission-field__statement {
    display: grid;
    grid-template-columns: minmax(14rem, .65fr) minmax(18rem, 1fr) minmax(18rem, 1fr);
    gap: clamp(1.5rem, 4vw, 4.4rem);
    max-width: var(--max);
    margin: clamp(3rem, 7vw, 7rem) auto 0;
    align-items: start;
  }

  .mission-big { grid-column: 1 / -1; max-width: 49ch; font-size: clamp(1.65rem, 1.18rem + 1.8vw, 3.1rem); line-height: 1.14; letter-spacing: -.025em; }
  .mission-field__statement > p:nth-child(2) { grid-column: 2; }
  .mission-field__statement > p:nth-child(3) { grid-column: 3; }

  .mission-path {
    max-width: var(--max);
    margin: clamp(4rem, 9vw, 9rem) auto 0;
    border-top: 1px solid var(--ink);
  }

  .mission-path article {
    display: grid;
    grid-template-columns: minmax(5rem, .27fr) minmax(15rem, .72fr) minmax(18rem, 1fr);
    gap: 1.5rem;
    align-items: baseline;
    padding-block: 1.5rem;
    border-bottom: 1px solid var(--rule-strong);
  }
  .mission-path article > span { color: var(--signal); text-transform: uppercase; letter-spacing: .12em; font-size: var(--step--1); font-weight: 760; }
  .mission-path h3 { font-size: clamp(1.35rem, 1.1rem + .75vw, 2rem); margin: 0; }
  .mission-path p { margin: 0; color: var(--muted); }

  .profession-crossing {
    min-height: 100svh;
    padding-block: clamp(6rem, 11vw, 11rem);
    display: grid;
    grid-template-columns: minmax(20rem, 1.12fr) minmax(20rem, .88fr);
    gap: clamp(2rem, 6vw, 7rem);
    align-items: center;
    background: var(--ink);
    color: var(--paper);
    clip-path: polygon(0 4%, 100% 0, 100% 96%, 0 100%);
  }
  .profession-crossing__image { min-height: min(70svh, 48rem); }
  .profession-crossing__copy { padding-block: 4rem; }
  .profession-crossing .eyebrow { color: var(--signal-soft); }
  .profession-crossing .section-number { color: var(--signal-soft); }
  .profession-crossing__copy p:not(.eyebrow):not(.lead-copy) { color: color-mix(in srgb, var(--paper) 73%, transparent); }

  .practice-ribbon { overflow: hidden; padding-block: 1.5rem; border-block: 1px solid var(--ink); background: var(--signal-soft); }
  .practice-ribbon__track { width: max-content; min-width: 100%; display: flex; align-items: center; justify-content: center; gap: 1.1rem; padding-inline: var(--edge); text-transform: uppercase; letter-spacing: .13em; font-size: var(--step--1); white-space: nowrap; }
  .practice-ribbon__track i { width: 2.7rem; height: 1px; background: currentColor; transform: rotate(-12deg); }

  .reference-sheet {
    padding-block: clamp(7rem, 12vw, 12rem);
    max-width: calc(var(--max) + (var(--edge) * 2));
    margin-inline: auto;
  }
  .reference-sheet__head { display: grid; grid-template-columns: minmax(4rem, .23fr) minmax(0, 1.77fr); gap: clamp(1.2rem, 4vw, 4rem); }
  .reference-sheet__head > div { display: grid; grid-template-columns: minmax(18rem, .9fr) minmax(18rem, .75fr); column-gap: clamp(2rem, 6vw, 7rem); align-items: end; }
  .reference-sheet__head .eyebrow, .reference-sheet__head h2 { grid-column: 1; }
  .reference-sheet__head > div > p:last-child { grid-column: 2; grid-row: 1 / 3; align-self: end; color: var(--muted); }

  .reference-lines { list-style: none; padding: 0; margin: clamp(4rem, 8vw, 8rem) 0 0; }
  .reference-lines li { display: grid; grid-template-columns: minmax(4rem, .22fr) minmax(0, 1.78fr); gap: clamp(1.2rem, 4vw, 4rem); padding-block: 2rem; border-top: 1px solid var(--ink); }
  .reference-lines__index { font-size: var(--step-2); color: var(--signal); line-height: .8; font-variant-numeric: tabular-nums; }
  .reference-lines li > div { display: grid; grid-template-columns: minmax(14rem, .72fr) minmax(18rem, 1fr); gap: clamp(1.5rem, 5vw, 5rem); }
  .reference-lines h3 { font-size: var(--step-1); margin: 0; }
  .reference-lines p { margin: 0; }

  .official-desk { margin-top: 5rem; padding: clamp(2rem, 5vw, 5rem); display: grid; grid-template-columns: minmax(18rem, .82fr) minmax(20rem, 1fr); gap: clamp(2rem, 7vw, 7rem); background: var(--signal-pale); border-left: .35rem solid var(--signal); }
  .official-desk h3 { font-size: clamp(1.7rem, 1.15rem + 1.7vw, 3rem); }
  .official-links { display: grid; align-self: center; }
  .official-links a { display: flex; justify-content: space-between; gap: 1.5rem; padding-block: 1rem; border-top: 1px solid var(--ink); text-decoration: none; }
  .official-links a:last-child { border-bottom: 1px solid var(--ink); }
  .official-links a:hover { color: var(--signal); }

  .orientation-field {
    padding-block: clamp(6rem, 11vw, 11rem);
    display: grid;
    grid-template-columns: minmax(20rem, .95fr) minmax(22rem, 1.05fr);
    gap: clamp(2rem, 8vw, 9rem);
    align-items: center;
    background: linear-gradient(110deg, var(--paper-deep) 0 54%, transparent 54% 100%);
  }
  .orientation-field__copy { max-width: 42rem; justify-self: end; }
  .orientation-field__copy p:not(.eyebrow) { color: color-mix(in srgb, var(--ink) 78%, transparent); }
  .orientation-field__image { min-height: min(62svh, 43rem); transform: rotate(1.4deg); }

  .association-story { padding-block: clamp(8rem, 13vw, 13rem); }
  .association-story__heading { display: grid; grid-template-columns: minmax(4rem, .22fr) minmax(10rem, .35fr) minmax(20rem, 1.43fr); gap: clamp(1.2rem, 4vw, 4rem); align-items: start; max-width: var(--max); margin-inline: auto; }
  .association-story__heading .eyebrow { margin-top: .2rem; }
  .association-story__heading h2 { max-width: 15ch; }
  .association-story__narrative { width: min(65rem, 78%); margin: clamp(4rem, 8vw, 8rem) 7% 0 auto; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1.5rem clamp(2rem, 6vw, 6rem); }
  .association-story__narrative .lead-copy { grid-column: 1 / -1; max-width: 45ch; }
  .association-story__narrative p:nth-child(4) { grid-column: 2; }

  .place-sequence { max-width: var(--max); margin: 6rem auto 0; display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(15rem, .55fr); gap: clamp(1.4rem, 4vw, 4rem); align-items: end; }
  .place-sequence__large { min-height: min(64svh, 44rem); }
  .place-sequence__small { min-height: min(38svh, 28rem); transform: translateY(3rem); }

  .identity-ledger {
    padding-block: clamp(7rem, 12vw, 12rem);
    display: grid;
    grid-template-columns: minmax(16rem, .72fr) minmax(24rem, 1.18fr);
    gap: clamp(2rem, 7vw, 8rem);
    background: var(--ink);
    color: var(--paper);
    clip-path: polygon(0 5%, 100% 0, 100% 95%, 0 100%);
  }
  .identity-ledger__heading { align-self: start; position: sticky; top: 7rem; }
  .identity-ledger__heading p:not(.eyebrow) { color: color-mix(in srgb, var(--paper) 68%, transparent); }
  .identity-ledger .eyebrow { color: var(--signal-soft); }
  .legal-register { margin: 0; }
  .legal-register div { display: grid; grid-template-columns: minmax(8rem, .42fr) 1fr; gap: 1rem; padding-block: 1rem; border-top: 1px solid color-mix(in srgb, var(--paper) 23%, transparent); }
  .legal-register dt { color: color-mix(in srgb, var(--paper) 58%, transparent); }
  .legal-register dd { overflow-wrap: anywhere; }
  .identity-ledger__image { grid-column: 2; min-height: 27rem; margin-top: 2rem; }

  .questions-field {
    padding-block: clamp(7rem, 13vw, 13rem);
    display: grid;
    grid-template-columns: minmax(16rem, .78fr) minmax(20rem, 1fr) minmax(13rem, .52fr);
    gap: clamp(2rem, 5vw, 6rem);
    align-items: start;
  }
  .questions-field__title { position: sticky; top: 7rem; }
  .questions-field__body { padding-top: 7rem; }
  .questions-field__body p + p { margin-top: 1.5rem; }
  .questions-field__visual { min-height: 33rem; transform: translateY(4rem); }

  .contact-pass {
    min-height: 92svh;
    padding-block: clamp(7rem, 13vw, 13rem);
    display: grid;
    grid-template-columns: minmax(3rem, .16fr) minmax(21rem, 1.2fr) minmax(15rem, .6fr);
    gap: clamp(1.5rem, 5vw, 5rem);
    align-items: center;
    background: var(--signal-pale);
  }
  .contact-pass__line { width: 1px; height: 82%; background: var(--ink); transform: rotate(9deg); justify-self: center; }
  .contact-pass__body { max-width: 62rem; }
  .contact-pass__intro { font-size: var(--step-1); max-width: 48ch; }
  .contact-address { display: inline-block; margin-block: 1.2rem 2.5rem; font-size: clamp(1.65rem, 4.4vw, 4.8rem); line-height: 1; text-decoration-thickness: .07em; text-underline-offset: .13em; overflow-wrap: anywhere; }
  .contact-safety { max-width: 47rem; padding-top: 1.2rem; border-top: 1px solid var(--ink); }
  .contact-safety strong { text-transform: uppercase; letter-spacing: .11em; font-size: var(--step--1); }
  .contact-safety p { margin: .55rem 0 0; color: var(--muted); }
  .contact-pass__image { min-height: min(58svh, 39rem); transform: rotate(-1.7deg); }

  .site-end { padding-block: 2.2rem 3rem; display: grid; grid-template-columns: minmax(15rem, 1fr) minmax(15rem, .8fr) minmax(19rem, 1.4fr) auto; gap: 2rem; align-items: start; border-top: 1px solid var(--ink); }
  .site-end__seal, .site-end__contact { display: flex; flex-direction: column; gap: .25rem; font-size: var(--step--1); }
  .site-end__seal strong { font-size: var(--step-0); }
  .site-end__contact a { font-weight: 700; }
  .site-end__privacy { font-size: var(--step--1); color: var(--muted); }
  .site-end__privacy > p { margin-bottom: .8rem; }
  .back-top { white-space: nowrap; font-size: var(--step--1); }
}

@layer components {
  .skip-link { position: fixed; left: 1rem; top: 1rem; z-index: 100; padding: .7rem 1rem; background: var(--ink); color: var(--paper); transform: translateY(-220%); }
  .skip-link:focus { transform: translateY(0); }

  .identity { display: inline-flex; align-items: center; gap: .7rem; text-decoration: none; font-weight: 780; letter-spacing: -.02em; }
  .identity__mark { display: grid; place-items: center; width: 2.35rem; height: 2.35rem; border: 1px solid currentColor; border-radius: 50%; font-size: .62rem; letter-spacing: .06em; }

  .route-toggle { display: none; border: 0; background: transparent; color: inherit; padding: .5rem; }
  .route { display: flex; align-items: center; gap: clamp(.75rem, 2vw, 2rem); font-size: var(--step--1); }
  .route a { text-decoration: none; padding-block: .35rem; border-bottom: 1px solid transparent; }
  .route a[aria-current="location"] { border-color: currentColor; }

  .eyebrow { margin-bottom: .8rem; text-transform: uppercase; letter-spacing: .14em; font-size: var(--step--1); color: var(--signal); font-weight: 760; }
  .section-number { display: inline-block; font-size: var(--step-2); line-height: .8; color: var(--signal); font-variant-numeric: tabular-nums; }
  .threshold h1 { font-size: var(--step-3); max-width: 10ch; }
  .mission-field h2, .reference-sheet h2, .association-story h2, .identity-ledger h2, .questions-field h2, .contact-pass h2 { font-size: var(--step-2); }
  .profession-crossing h2, .orientation-field h2 { font-size: var(--step-2); max-width: 13ch; }
  .lead-copy { font-size: clamp(1.26rem, 1.06rem + .78vw, 1.85rem); line-height: 1.35; letter-spacing: -.015em; }

  .text-action { display: inline-flex; align-items: center; gap: .6rem; padding: .75rem 0; border-bottom: 1px solid currentColor; text-decoration: none; font-weight: 700; }
  .text-action--quiet { color: var(--muted); }
  .text-action:hover { color: var(--signal); }

  .media-frame { position: relative; overflow: hidden; background: var(--paper-deep); }
  .media-frame img { width: 100%; height: 100%; object-fit: cover; filter: saturate(.88) contrast(1.02); }
  .media-frame figcaption { position: absolute; inset: auto .7rem .7rem .7rem; width: fit-content; max-width: calc(100% - 1.4rem); padding: .45rem .6rem; background: color-mix(in srgb, var(--ink) 83%, transparent); color: var(--paper); font-size: .72rem; line-height: 1.35; letter-spacing: .01em; }
  .media-frame--portrait img { object-position: 48% center; }
  .media-frame--wide img { object-position: center; }
  .media-frame--landscape img { object-position: center; }
  .media-frame--vertical img { object-position: 62% center; }

  .reading-rail { position: fixed; z-index: 45; right: .42rem; top: 15vh; height: 70vh; width: .5rem; pointer-events: none; }
  .reading-rail__line { position: absolute; top: 0; bottom: 0; left: 50%; width: 1px; background: var(--rule); }
  .reading-rail__cursor { position: absolute; left: 50%; width: .45rem; aspect-ratio: 1; border-radius: 50%; background: var(--rust); transform: translate(-50%, -50%); top: 0; }

  .credits summary { cursor: pointer; color: var(--ink); text-decoration: underline; text-underline-offset: .18em; }
  .credits__body { margin-top: .8rem; padding-top: .8rem; border-top: 1px solid var(--rule); }
  .credits__body p { margin-bottom: .65rem; font-size: .73rem; line-height: 1.45; }
}

@layer responsive {
  @media (max-width: 70rem) {
    .threshold { grid-template-columns: 2rem minmax(0, 1.12fr) minmax(16rem, .72fr); gap: 2rem; }
    .threshold__visual { min-height: 52svh; }
    .mission-field__statement { grid-template-columns: minmax(8rem, .3fr) 1fr 1fr; }
    .profession-crossing { grid-template-columns: 1fr 1fr; }
    .questions-field { grid-template-columns: minmax(16rem, .8fr) minmax(20rem, 1.2fr); }
    .questions-field__visual { grid-column: 2; min-height: 25rem; transform: none; }
    .contact-pass { grid-template-columns: 2rem minmax(20rem, 1.2fr) minmax(12rem, .5fr); }
    .site-end { grid-template-columns: 1fr 1fr; }
    .back-top { justify-self: end; }
  }

  @media (max-width: 54rem) {
    .threshold { grid-template-columns: 2rem 1fr; min-height: auto; padding-top: 7rem; }
    .threshold__statement { grid-column: 2; }
    .threshold__visual { grid-column: 2; width: min(31rem, 88%); min-height: 32rem; justify-self: end; }
    .thread-entry { grid-column: 2; }

    .mission-field__header, .reference-sheet__head { grid-template-columns: 2rem 1fr; }
    .mission-field__statement { display: block; margin-left: 4rem; }
    .mission-field__statement > p { margin-bottom: 1.6rem; }
    .mission-path { margin-left: 4rem; }
    .mission-path article { grid-template-columns: minmax(5rem, .32fr) 1fr; }
    .mission-path p { grid-column: 2; }

    .profession-crossing { grid-template-columns: 1fr; clip-path: polygon(0 2%, 100% 0, 100% 98%, 0 100%); }
    .profession-crossing__image { width: 74%; min-height: 31rem; }
    .profession-crossing__copy { max-width: 42rem; margin-left: auto; padding-block: 1rem 4rem; }

    .reference-sheet__head > div { grid-template-columns: 1fr; }
    .reference-sheet__head > div > p:last-child { grid-column: 1; grid-row: auto; margin-top: 1.5rem; }
    .reference-lines li { grid-template-columns: 2.2rem 1fr; gap: 1rem; }
    .reference-lines li > div { grid-template-columns: 1fr; gap: .7rem; }
    .official-desk { grid-template-columns: 1fr; }

    .orientation-field { grid-template-columns: 1fr; background: linear-gradient(180deg, var(--paper-deep) 0 62%, transparent 62% 100%); }
    .orientation-field__copy { justify-self: start; }
    .orientation-field__image { width: 82%; justify-self: end; min-height: 34rem; }

    .association-story__heading { grid-template-columns: 2rem 1fr; }
    .association-story__heading .eyebrow { grid-column: 2; }
    .association-story__heading h2 { grid-column: 2; }
    .association-story__narrative { width: calc(100% - 4rem); margin-left: 4rem; grid-template-columns: 1fr; }
    .association-story__narrative p:nth-child(4) { grid-column: auto; }
    .place-sequence { grid-template-columns: 1fr; margin-left: 4rem; }
    .place-sequence__small { width: 58%; justify-self: end; transform: translateY(1rem); }

    .identity-ledger { grid-template-columns: 1fr; clip-path: polygon(0 2%, 100% 0, 100% 98%, 0 100%); }
    .identity-ledger__heading { position: static; }
    .identity-ledger__image { grid-column: 1; }

    .questions-field { grid-template-columns: 1fr; }
    .questions-field__title { position: static; }
    .questions-field__body { padding-top: 0; width: 82%; margin-left: auto; }
    .questions-field__visual { grid-column: 1; width: 48%; justify-self: start; }

    .contact-pass { grid-template-columns: 2rem 1fr; }
    .contact-pass__body { grid-column: 2; }
    .contact-pass__image { grid-column: 2; width: 60%; justify-self: end; min-height: 25rem; }
  }

  @media (max-width: 48rem) {
    .masthead { background: color-mix(in srgb, var(--paper) 94%, transparent); border-color: var(--rule); backdrop-filter: blur(12px); }
    .route-toggle { display: inline-flex; align-items: center; gap: .6rem; cursor: pointer; }
    .route-toggle__glyph { width: 1rem; height: 1rem; border: 1px solid currentColor; border-radius: 50%; position: relative; }
    .route-toggle__glyph::after { content: ""; position: absolute; inset: 50% auto auto 50%; width: .3rem; height: .3rem; background: currentColor; border-radius: 50%; transform: translate(-50%, -50%); }
    .route { position: absolute; inset: calc(100% + 1px) 0 auto; display: grid; grid-template-columns: 1fr; gap: 0; padding: .8rem var(--edge) 1rem; background: var(--paper); border-bottom: 1px solid var(--rule); transform-origin: top; opacity: 0; visibility: hidden; transform: scaleY(.96); transition: opacity .15s ease, transform .15s ease, visibility .15s; }
    .route[data-open="true"] { opacity: 1; visibility: visible; transform: scaleY(1); }
    .route a { padding-block: .68rem; }
    .reading-rail { display: none; }

    .threshold { grid-template-columns: 1fr; gap: 2.5rem; }
    .threshold__quiet { display: none; }
    .threshold__statement, .threshold__visual, .thread-entry { grid-column: 1; }
    .threshold h1 { font-size: clamp(3.4rem, 17vw, 6.7rem); }
    .threshold__visual { width: 86%; min-height: 29rem; }
    .continuity__thread { left: 2.2rem; }

    .mission-field__header, .reference-sheet__head { grid-template-columns: 1fr; }
    .mission-field__statement, .mission-path, .association-story__narrative, .place-sequence { margin-left: 0; width: 100%; }
    .mission-path article { grid-template-columns: 1fr; gap: .7rem; }
    .mission-path p { grid-column: 1; }

    .profession-crossing__image { width: 92%; min-height: 25rem; }
    .profession-crossing__copy { margin-left: 0; }
    .practice-ribbon__track { justify-content: flex-start; overflow: hidden; }

    .reference-lines li { grid-template-columns: 1fr; }
    .reference-lines__index { font-size: 2rem; }
    .official-desk { padding: 1.5rem; }

    .orientation-field__image { width: 100%; min-height: 27rem; }

    .association-story__heading { grid-template-columns: 1fr; }
    .association-story__heading .eyebrow, .association-story__heading h2 { grid-column: 1; }
    .place-sequence__large { min-height: 27rem; }
    .place-sequence__small { width: 72%; min-height: 20rem; }

    .legal-register div { grid-template-columns: 1fr; gap: .2rem; }
    .identity-ledger__image { min-height: 23rem; }

    .questions-field__body { width: 100%; }
    .questions-field__visual { width: 76%; }

    .contact-pass { grid-template-columns: 1fr; }
    .contact-pass__line { display: none; }
    .contact-pass__body, .contact-pass__image { grid-column: 1; }
    .contact-pass__image { width: 78%; min-height: 24rem; }
    .contact-address { font-size: clamp(1.6rem, 8.2vw, 3.2rem); }

    .site-end { grid-template-columns: 1fr; }
    .back-top { justify-self: start; }
  }

  @media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .001ms !important; animation-duration: .001ms !important; animation-iteration-count: 1 !important; }
  }

  @media (prefers-contrast: more) {
    :root { --rule: currentColor; --rule-strong: currentColor; }
    .orientation-field { background: var(--paper); }
    .official-desk { background: var(--paper); }
  }
}

@layer composition {
  .isolation-note {
    padding: clamp(6rem, 10vw, 10rem) var(--edge);
    display: grid;
    grid-template-columns: minmax(3rem, .18fr) minmax(17rem, .72fr) minmax(20rem, 1.1fr);
    gap: clamp(1.5rem, 5vw, 6rem);
    align-items: start;
    border-block: 1px solid var(--ink);
    background: linear-gradient(90deg, transparent 0 72%, color-mix(in srgb, var(--rust) 8%, transparent) 72% 100%);
  }
  .isolation-note__marker { width: 2.5rem; height: 2.5rem; display: grid; place-items: center; border: 1px solid var(--ink); border-radius: 50%; font-size: 1.4rem; color: var(--rust); }
  .isolation-note__title h2 { font-size: var(--step-2); max-width: 12ch; }
  .isolation-note__body { padding-top: 5rem; }
  .isolation-note__body p + p { margin-top: 1.5rem; }
  .isolation-note__phrase { grid-column: 2 / 4; margin-top: 1rem; padding-top: 1.2rem; border-top: 1px solid var(--ink); font-size: clamp(1.4rem, 1.05rem + 1.5vw, 2.6rem); letter-spacing: -.025em; color: var(--signal); }

  .information-method {
    padding: clamp(7rem, 12vw, 12rem) var(--edge);
    background: var(--chalk);
  }
  .information-method__heading { max-width: var(--max); margin-inline: auto; display: grid; grid-template-columns: minmax(18rem, 1fr) minmax(18rem, .78fr); gap: clamp(2rem, 6vw, 7rem); align-items: end; }
  .information-method__heading .eyebrow, .information-method__heading h2 { grid-column: 1; }
  .information-method__heading h2 { font-size: var(--step-2); max-width: 14ch; }
  .information-method__heading > p:last-child { grid-column: 2; grid-row: 1 / 3; margin: 0; color: var(--muted); }
  .information-method__flow { max-width: var(--max); margin: clamp(4rem, 8vw, 8rem) auto 0; display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid var(--ink); }
  .information-method__flow article { min-height: 23rem; padding: 1.5rem 1.4rem 2rem 0; border-right: 1px solid var(--rule-strong); }
  .information-method__flow article + article { padding-left: 1.4rem; }
  .information-method__flow article:last-child { border-right: 0; }
  .information-method__flow span { display: block; margin-bottom: 3.5rem; color: var(--signal); text-transform: uppercase; letter-spacing: .11em; font-size: var(--step--1); font-weight: 760; }
  .information-method__flow h3 { font-size: clamp(1.35rem, 1.05rem + .8vw, 2rem); min-height: 3.9rem; }
  .information-method__flow p { color: var(--muted); }

  .practical-questions {
    padding: clamp(7rem, 12vw, 12rem) var(--edge);
    display: grid;
    grid-template-columns: minmax(18rem, .72fr) minmax(23rem, 1.28fr);
    gap: clamp(2rem, 8vw, 9rem);
  }
  .practical-questions__heading { position: sticky; top: 7rem; align-self: start; }
  .practical-questions__heading h2 { font-size: var(--step-2); max-width: 13ch; }
  .practical-questions__list { border-top: 1px solid var(--ink); }
  .practical-questions__list article { padding-block: 2rem; border-bottom: 1px solid var(--rule-strong); }
  .practical-questions__list h3 { font-size: clamp(1.35rem, 1.05rem + .9vw, 2.05rem); max-width: 25ch; }
  .practical-questions__list p { margin-bottom: 0; color: var(--muted); }
}

@layer responsive {
  @media (max-width: 54rem) {
    .isolation-note { grid-template-columns: 2rem 1fr; }
    .isolation-note__title { grid-column: 2; }
    .isolation-note__body { grid-column: 2; padding-top: 0; }
    .isolation-note__phrase { grid-column: 2; }
    .information-method__heading { grid-template-columns: 1fr; }
    .information-method__heading > p:last-child { grid-column: 1; grid-row: auto; }
    .information-method__flow { grid-template-columns: repeat(2, 1fr); }
    .information-method__flow article:nth-child(2) { border-right: 0; }
    .information-method__flow article:nth-child(n+3) { border-top: 1px solid var(--ink); }
    .practical-questions { grid-template-columns: 1fr; }
    .practical-questions__heading { position: static; }
  }

  @media (max-width: 48rem) {
    .isolation-note { grid-template-columns: 1fr; }
    .isolation-note__marker, .isolation-note__title, .isolation-note__body, .isolation-note__phrase { grid-column: 1; }
    .information-method__flow { grid-template-columns: 1fr; }
    .information-method__flow article, .information-method__flow article + article { min-height: auto; padding: 1.5rem 0 2rem; border-right: 0; border-top: 1px solid var(--ink); }
    .information-method__flow article:first-child { border-top: 0; }
    .information-method__flow span { margin-bottom: 1.5rem; }
    .information-method__flow h3 { min-height: 0; }
  }
}