/* aerais — stylesheet. Edit design tokens under :root. */
/* ============================================================
     aerais — Data & AI Governance Systems
     Design language: "Control Document" — architectural, coded,
     precise. Cool graphite ink on architectural gray. Deep crimson
     used only for risk/critical/active semantics.
     ============================================================ */

  :root {
    /* aerais — Slate Ink / Mist / Horizon Azure / Platinum */
    --ink:        #1B2027;   /* Slate Ink — primary text, marks */
    --ink-2:      #525b6b;   /* readable secondary (AA on Mist) */
    --ink-3:      #5c6675;   /* muted labels (AA on Mist) */
    --paper:      #F3F5F6;   /* Mist — primary canvas */
    --surface:    #FFFFFF;   /* Pure white container */
    --surface-2:  #E9ECEE;   /* subtle fill */
    --line:       #D8DCDF;   /* Platinum-tint hairline */
    --line-2:     #AEB4BB;   /* Platinum — structural rule */
    --accent:     #1E7FE0;   /* Horizon Azure — signal / active / CTA */
    --accent-ink: #2E8BEA;   /* Azure tuned for dark surfaces */

    --obsidian:   #111418;   /* dark canvas */
    --slate-elev: #1B2027;   /* elevated container on dark */
    --dark-line:  #2E3642;   /* Subdued Slate — dark grid lines */

    --emerald:    #10B981;   /* validated / compliant */
    --amber:      #F59E0B;   /* drift / review */
    --breach:     #E63946;   /* hard policy breach (kill-switch) */

    --font-display: "Söhne", "Inter", system-ui, sans-serif;
    --font-body:    "Inter", system-ui, sans-serif;
    --font-mono:    "JetBrains Mono", ui-monospace, monospace;

    --wrap: 1180px;
    --pad-x: clamp(1.25rem, 5vw, 3rem);
    --section-y: clamp(5rem, 10vw, 8.5rem);
  }

  * { margin: 0; padding: 0; box-sizing: border-box; }

  html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

  body {
    background: var(--paper);
    color: var(--ink);
    font-family: var(--font-body);
    font-size: clamp(1rem, 0.97rem + 0.15vw, 1.0625rem);
    line-height: 1.62;
    font-weight: 400;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
    overflow-x: hidden;
  }

  a { color: inherit; text-decoration: none; }
  ::selection { background: var(--accent); color: #fff; }

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

  /* ---------- layout primitives ---------- */
  .wrap { max-width: var(--wrap); margin-inline: auto; padding-inline: var(--pad-x); }
  .section { padding-block: var(--section-y); position: relative; }
  .section + .section { border-top: 1px solid var(--line); }

  .section--dark {
    background: var(--obsidian);
    color: var(--paper);
    border-top: none;
  }
  .section--dark .eyebrow { color: rgba(243, 245, 246, 0.58); }
  .section--dark .lead,
  .section--dark .body-muted { color: rgba(243, 245, 246, 0.74); }

  /* ---------- typography utilities ---------- */
  .eyebrow {
    font-family: var(--font-mono);
    font-weight: 500;
    font-size: 0.72rem;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--ink-3);
    display: inline-flex;
    align-items: center;
    gap: 0.6em;
  }
  .eyebrow::before {
    content: "";
    width: 1.4rem;
    height: 1px;
    background: var(--accent);
    display: inline-block;
  }

  .h1 {
    font-family: var(--font-display);
    font-weight: 800;
    font-size: clamp(2.55rem, 1.4rem + 5vw, 5.15rem);
    line-height: 0.99;
    letter-spacing: -0.022em;
  }
  .h2 {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(1.9rem, 1.2rem + 2.6vw, 3.05rem);
    line-height: 1.02;
    letter-spacing: -0.018em;
  }
  .h3 {
    font-family: var(--font-body);
    font-weight: 600;
    font-size: clamp(1.05rem, 1rem + 0.35vw, 1.22rem);
    line-height: 1.25;
    letter-spacing: -0.01em;
  }
  .lead {
    font-size: clamp(1.08rem, 1rem + 0.55vw, 1.4rem);
    line-height: 1.5;
    color: var(--ink-2);
    font-weight: 400;
    max-width: 46ch;
  }
  .body-muted { color: var(--ink-2); }
  .mono {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    letter-spacing: 0.02em;
  }

  .accent { color: var(--accent); }
  .section--dark .accent { color: var(--accent-ink); }

  /* ---------- buttons ---------- */
  .btn {
    display: inline-flex;
    align-items: center;
    gap: 0.7em;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    padding: 0.95em 1.5em;
    border: 1px solid var(--ink);
    background: var(--ink);
    color: var(--paper);
    cursor: pointer;
    transition: background .3s ease, color .3s ease, border-color .3s ease, transform .3s ease;
  }
  .btn:hover { background: var(--accent); border-color: var(--accent); }
  .btn .arw { transition: transform .3s ease; }
  .btn:hover .arw { transform: translateX(4px); }

  .btn--ghost {
    background: transparent;
    color: var(--ink);
    border-color: var(--line-2);
  }
  .btn--ghost:hover { background: var(--ink); color: var(--paper); border-color: var(--ink); }

  .section--dark .btn { background: var(--paper); color: var(--ink); border-color: var(--paper); }
  .section--dark .btn:hover { background: var(--accent-ink); color: #fff; border-color: var(--accent-ink); }
  .section--dark .btn--ghost { background: transparent; color: var(--paper); border-color: rgba(235,236,239,0.32); }
  .section--dark .btn--ghost:hover { background: var(--paper); color: var(--ink); }

  /* ============================================================
     HEADER
     ============================================================ */
  .header {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 100;
    background: rgba(243, 245, 246, 0.82);
    backdrop-filter: saturate(140%) blur(14px);
    -webkit-backdrop-filter: saturate(140%) blur(14px);
    border-bottom: 1px solid transparent;
    transition: border-color .3s ease, background .3s ease;
  }
  .header.scrolled { border-bottom-color: var(--line); background: rgba(243,245,246,0.92); }
  .header__inner {
    max-width: var(--wrap);
    margin-inline: auto;
    padding: 0.95rem var(--pad-x);
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: padding .3s ease;
  }
  .header.scrolled .header__inner { padding-block: 0.7rem; }

  .brand { display: inline-flex; align-items: center; gap: 0.6rem; }
  .brand__mark { width: 23px; height: 23px; color: var(--ink); flex: none; }
  .brand__mark .jbar { stroke: var(--accent); }
  .brand__word {
    font-family: var(--font-display);
    font-weight: 800;
    font-size: 1.18rem;
    letter-spacing: 0.02em;
  }
  .brand__word .dot { color: var(--accent); }

  .nav { display: flex; align-items: center; gap: 2rem; }
  .nav__link {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    letter-spacing: 0.04em;
    color: var(--ink-2);
    position: relative;
    padding-block: 0.2rem;
    transition: color .25s ease;
  }
  .nav__link::after {
    content: "";
    position: absolute;
    left: 0; bottom: -2px;
    width: 0; height: 1px;
    background: var(--accent);
    transition: width .3s ease;
  }
  .nav__link:hover { color: var(--ink); }
  .nav__link:hover::after { width: 100%; }

  .nav__cta {
    font-family: var(--font-mono);
    font-size: 0.76rem;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    border: 1px solid var(--line-2);
    padding: 0.55em 1.1em;
    color: var(--ink);
    transition: background .25s ease, color .25s ease, border-color .25s ease;
  }
  .nav__cta:hover { background: var(--ink); color: var(--paper); border-color: var(--ink); }

  .menu-btn {
    display: none;
    background: none; border: none; cursor: pointer;
    width: 30px; height: 22px; position: relative;
  }
  .menu-btn span {
    position: absolute; left: 0; height: 1.5px; width: 100%;
    background: var(--ink); transition: transform .3s ease, opacity .3s ease;
  }
  .menu-btn span:nth-child(1) { top: 3px; }
  .menu-btn span:nth-child(2) { top: 10.5px; }
  .menu-btn span:nth-child(3) { top: 18px; }
  body.menu-open .menu-btn span:nth-child(1) { transform: translateY(7.5px) rotate(45deg); }
  body.menu-open .menu-btn span:nth-child(2) { opacity: 0; }
  body.menu-open .menu-btn span:nth-child(3) { transform: translateY(-7.5px) rotate(-45deg); }

  .mobile-nav {
    position: fixed; inset: 0; z-index: 90;
    background: var(--paper);
    padding: 6rem var(--pad-x) 2rem;
    display: flex; flex-direction: column; gap: 0.4rem;
    transform: translateY(-100%);
    transition: transform .45s cubic-bezier(.16,.84,.44,1);
    visibility: hidden;
  }
  body.menu-open .mobile-nav { transform: translateY(0); visibility: visible; }
  .mobile-nav a {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(1.8rem, 8vw, 2.4rem);
    padding-block: 0.5rem;
    border-bottom: 1px solid var(--line);
    letter-spacing: -0.01em;
  }
  .mobile-nav a .idx { font-family: var(--font-mono); font-size: 0.8rem; color: var(--ink-3); margin-right: 1rem; font-weight: 400; letter-spacing: 0.1em; }

  /* ============================================================
     HERO
     ============================================================ */
  .hero { padding-top: clamp(8rem, 16vw, 12rem); padding-bottom: 0; }
  .hero__eyebrow { margin-bottom: 2rem; }
  .hero__title { max-width: 18ch; }
  .hero__title .soft { color: var(--ink-3); }
  .hero__lower {
    margin-top: 2.4rem;
    display: grid;
    grid-template-columns: 1.15fr 1fr;
    gap: clamp(2rem, 5vw, 5rem);
    align-items: end;
  }
  .hero__sub { max-width: 44ch; }
  .hero__actions { display: flex; flex-wrap: wrap; gap: 0.8rem; margin-top: 1.8rem; }

  /* hero spec strip */
  .spec {
    margin-top: clamp(3rem, 6vw, 4.5rem);
    border-top: 1px solid var(--line);
    display: grid;
    grid-template-columns: repeat(3, 1fr);
  }
  .spec__cell {
    padding: 1.4rem 1.6rem 1.4rem 0;
    border-right: 1px solid var(--line);
  }
  .spec__cell:last-child { border-right: none; }
  .spec__k {
    font-family: var(--font-mono);
    font-size: 0.68rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--ink-3);
    display: block;
    margin-bottom: 0.55rem;
  }
  .spec__v { font-size: 0.94rem; color: var(--ink); line-height: 1.4; }

  /* ============================================================
     SECTION HEAD (shared)
     ============================================================ */
  .head { display: grid; grid-template-columns: 1fr; gap: 1.2rem; max-width: 62ch; margin-bottom: clamp(2.5rem, 5vw, 4rem); }
  .head .eyebrow { margin-bottom: 0.4rem; }

  /* ============================================================
     01 MANDATE
     ============================================================ */
  .mandate__grid { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: clamp(2rem, 6vw, 5rem); align-items: start; }
  .realities { border-top: 1px solid var(--line); }
  .reality {
    display: grid;
    grid-template-columns: 3.2rem 1fr;
    gap: 1rem;
    padding: 1.35rem 0;
    border-bottom: 1px solid var(--line);
    align-items: baseline;
  }
  .reality__n { font-family: var(--font-mono); font-size: 0.72rem; color: var(--accent); letter-spacing: 0.06em; }
  .reality__t { font-size: 1.02rem; color: var(--ink); line-height: 1.45; }
  .pull {
    margin-top: 2.6rem;
    font-family: var(--font-display);
    font-weight: 600;
    font-size: clamp(1.15rem, 1rem + 0.8vw, 1.55rem);
    line-height: 1.28;
    letter-spacing: -0.01em;
    max-width: 24ch;
  }

  /* ============================================================
     02 POSITION
     ============================================================ */
  .position__grid { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(2rem, 6vw, 5rem); align-items: center; }
  .nots { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0.8rem; margin-bottom: 1.6rem; }
  .not {
    border: 1px solid var(--line);
    padding: 1.1rem 1rem;
    background: var(--surface);
  }
  .not__x { font-family: var(--font-mono); color: var(--accent); font-size: 0.9rem; display: block; margin-bottom: 0.5rem; }
  .not__t { font-size: 0.92rem; color: var(--ink-2); line-height: 1.35; }
  .isstate {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(1.4rem, 1.1rem + 1.4vw, 2.1rem);
    line-height: 1.12;
    letter-spacing: -0.015em;
  }
  .position__note { margin-top: 1.6rem; max-width: 40ch; color: var(--ink-2); }

  /* ============================================================
     03 SERVICES
     ============================================================ */
  .svc-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    border-top: 1px solid var(--line);
    border-left: 1px solid var(--line);
  }
  .svc {
    border-right: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
    padding: 1.8rem 1.7rem 2rem;
    display: flex;
    flex-direction: column;
    gap: 0.9rem;
    background: var(--paper);
    transition: background .3s ease;
  }
  .svc:hover { background: var(--surface); }
  .svc__code {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.1em;
    color: var(--ink-3);
    display: flex; justify-content: space-between; align-items: center;
  }
  .svc__code .q { color: var(--accent); }
  .svc__title { margin-top: 0.2rem; }
  .svc__list { list-style: none; display: flex; flex-direction: column; gap: 0.55rem; margin-top: auto; }
  .svc__list li {
    font-size: 0.9rem;
    color: var(--ink-2);
    padding-left: 1.1rem;
    position: relative;
    line-height: 1.35;
  }
  .svc__list li::before {
    content: "";
    position: absolute; left: 0; top: 0.55em;
    width: 5px; height: 5px;
    border: 1px solid var(--line-2);
  }

  /* ============================================================
     04 METHOD
     ============================================================ */
  .phases { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid var(--line); }
  .phase {
    padding: 1.9rem 1.4rem 0 0;
    border-right: 1px solid var(--line);
    position: relative;
  }
  .phase:last-child { border-right: none; padding-right: 0; }
  .phase__n {
    font-family: var(--font-mono);
    font-size: 0.74rem;
    color: var(--accent);
    letter-spacing: 0.1em;
    display: block;
    margin-bottom: 1.4rem;
  }
  .phase__t { font-family: var(--font-display); font-weight: 700; font-size: 1.15rem; letter-spacing: 0.02em; margin-bottom: 0.8rem; }
  .phase__d { font-size: 0.92rem; color: var(--ink-2); line-height: 1.45; padding-bottom: 1.9rem; }
  .method__note { margin-top: 2.4rem; font-family: var(--font-mono); font-size: 0.78rem; color: var(--ink-3); letter-spacing: 0.02em; }
  .method__note .accent { color: var(--accent); }

  /* ============================================================
     OPERATING MODEL (dark)
     ============================================================ */
  .om__grid { display: grid; grid-template-columns: 0.8fr 1.2fr; gap: clamp(2.5rem, 6vw, 5rem); align-items: center; }
  .stack { border-top: 1px solid rgba(235,236,239,0.16); }
  .layer {
    display: grid;
    grid-template-columns: 1.3rem 1fr auto;
    gap: 1.1rem;
    align-items: center;
    padding: 1.05rem 0;
    border-bottom: 1px solid rgba(235,236,239,0.16);
  }
  .layer__node {
    width: 9px; height: 9px;
    border: 1px solid rgba(235,236,239,0.5);
    justify-self: center;
  }
  .layer--focus .layer__node { background: var(--accent-ink); border-color: var(--accent-ink); }
  .layer__name { font-family: var(--font-display); font-weight: 600; font-size: clamp(0.98rem, 1.5vw, 1.12rem); letter-spacing: 0.01em; }
  .layer__role { font-family: var(--font-mono); font-size: 0.68rem; letter-spacing: 0.06em; color: rgba(235,236,239,0.55); text-align: right; }
  .layer__role .line-tag { color: var(--accent-ink); display: block; font-size: 0.62rem; margin-bottom: 0.2rem; letter-spacing: 0.12em; }

  /* ============================================================
     05 FRAMEWORK / IP
     ============================================================ */
  .ip-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); }
  .ip {
    background: var(--paper);
    padding: 1.6rem 1.5rem;
    display: flex; flex-direction: column; gap: 0.6rem;
    transition: background .3s ease;
  }
  .ip:hover { background: var(--surface); }
  .ip__code { font-family: var(--font-mono); font-size: 0.68rem; letter-spacing: 0.1em; color: var(--ink-3); }
  .ip__t { font-family: var(--font-display); font-weight: 600; font-size: 1.02rem; letter-spacing: 0.01em; }
  .ip__d { font-size: 0.88rem; color: var(--ink-2); line-height: 1.45; }

  /* maturity instrument */
  .maturity { margin-top: clamp(2.5rem, 5vw, 3.5rem); }
  .maturity__label { font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--ink-3); margin-bottom: 1rem; display: block; }
  .gauge { display: grid; grid-template-columns: repeat(5, 1fr); border: 1px solid var(--line-2); }
  .gauge__seg {
    padding: 1rem 1rem 1.1rem;
    border-right: 1px solid var(--line-2);
    position: relative;
  }
  .gauge__seg:last-child { border-right: none; }
  .gauge__bar { height: 4px; background: var(--ink); margin-bottom: 0.9rem; }
  .gauge__seg:nth-child(1) .gauge__bar { opacity: 0.16; }
  .gauge__seg:nth-child(2) .gauge__bar { opacity: 0.36; }
  .gauge__seg:nth-child(3) .gauge__bar { opacity: 0.58; }
  .gauge__seg:nth-child(4) .gauge__bar { opacity: 0.8; }
  .gauge__seg:nth-child(5) .gauge__bar { background: var(--accent); opacity: 1; }
  .gauge__n { font-family: var(--font-mono); font-size: 0.7rem; color: var(--ink-3); }
  .gauge__t { font-family: var(--font-display); font-weight: 600; font-size: 0.92rem; margin-top: 0.25rem; letter-spacing: 0.01em; }

  /* ============================================================
     06 ENGAGEMENT
     ============================================================ */
  .tiers { border-top: 1px solid var(--line); }
  .tier {
    display: grid;
    grid-template-columns: 2.6rem 1.2fr 1.6fr auto;
    gap: clamp(1rem, 3vw, 2.4rem);
    align-items: center;
    padding: 1.8rem 0;
    border-bottom: 1px solid var(--line);
    transition: background .3s ease;
  }
  .tier:hover { background: var(--surface); }
  .tier__code { font-family: var(--font-mono); font-size: 0.8rem; color: var(--accent); letter-spacing: 0.06em; }
  .tier__name { font-family: var(--font-display); font-weight: 700; font-size: clamp(1.1rem, 1rem + 0.7vw, 1.5rem); letter-spacing: -0.005em; }
  .tier__name small { display: block; font-family: var(--font-mono); font-weight: 400; font-size: 0.7rem; color: var(--ink-3); letter-spacing: 0.06em; text-transform: uppercase; margin-top: 0.4rem; }
  .tier__scope { font-size: 0.92rem; color: var(--ink-2); line-height: 1.4; }
  .tier__price {
    font-family: var(--font-mono);
    font-size: 0.98rem;
    color: var(--ink);
    text-align: right;
    white-space: nowrap;
    font-variant-numeric: tabular-nums;
  }
  .tier__price span { display: block; font-size: 0.64rem; color: var(--ink-3); letter-spacing: 0.1em; text-transform: uppercase; margin-top: 0.35rem; }
  .eng-note { margin-top: 1.6rem; font-family: var(--font-mono); font-size: 0.74rem; color: var(--ink-3); letter-spacing: 0.02em; }

  /* ============================================================
     07 SECTORS
     ============================================================ */
  .sectors { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
  .sector {
    border-right: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
    padding: 1.7rem 1.6rem 1.9rem;
    display: flex; flex-direction: column; gap: 0.55rem;
  }
  .sector__n { font-family: var(--font-mono); font-size: 0.7rem; color: var(--ink-3); letter-spacing: 0.1em; }
  .sector__t { font-family: var(--font-display); font-weight: 700; font-size: 1.1rem; letter-spacing: 0.005em; }
  .sector__d { font-size: 0.88rem; color: var(--ink-2); line-height: 1.4; }
  .ideal {
    margin-top: 2.2rem;
    display: flex; align-items: baseline; gap: 1rem; flex-wrap: wrap;
    font-family: var(--font-mono); font-size: 0.82rem; color: var(--ink-2); letter-spacing: 0.02em;
  }
  .ideal b { color: var(--ink); font-weight: 500; }
  .ideal .lbl { color: var(--accent); text-transform: uppercase; font-size: 0.68rem; letter-spacing: 0.14em; }

  /* ============================================================
     08 CONTACT (dark)
     ============================================================ */
  .contact__grid { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(2.5rem, 6vw, 5rem); align-items: start; }
  .contact__title { max-width: 16ch; }
  .contact__meta { margin-top: 2rem; display: flex; flex-direction: column; gap: 1rem; }
  .contact__meta a { font-family: var(--font-mono); font-size: 0.9rem; letter-spacing: 0.02em; color: var(--paper); border-bottom: 1px solid rgba(235,236,239,0.3); padding-bottom: 2px; width: fit-content; transition: border-color .25s ease, color .25s ease; }
  .contact__meta a:hover { color: var(--accent-ink); border-color: var(--accent-ink); }

  .form { display: grid; gap: 1rem; }
  .field { display: grid; gap: 0.45rem; }
  .field label { font-family: var(--font-mono); font-size: 0.68rem; letter-spacing: 0.12em; text-transform: uppercase; color: rgba(235,236,239,0.55); }
  .field input, .field textarea {
    background: transparent;
    border: none;
    border-bottom: 1px solid rgba(235,236,239,0.28);
    color: var(--paper);
    font-family: var(--font-body);
    font-size: 1rem;
    padding: 0.55rem 0;
    transition: border-color .25s ease;
  }
  .field input:focus, .field textarea:focus { outline: none; border-bottom-color: var(--accent-ink); }
  .field textarea { resize: vertical; min-height: 3rem; }
  .form .btn { margin-top: 0.6rem; justify-self: start; }

  /* ============================================================
     FOOTER
     ============================================================ */
  .footer { background: var(--obsidian); color: var(--paper); padding-block: clamp(3.5rem, 7vw, 5rem) 2.5rem; }
  .footer__top { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 2.5rem; padding-bottom: 3rem; border-bottom: 1px solid rgba(235,236,239,0.14); }
  .footer__brand .brand__mark { color: var(--paper); }
  .footer__brand .brand__word { color: var(--paper); }
  .footer__tag { margin-top: 1.2rem; color: rgba(235,236,239,0.6); font-size: 0.92rem; max-width: 32ch; line-height: 1.5; }
  .footer__col h4 { font-family: var(--font-mono); font-size: 0.68rem; letter-spacing: 0.14em; text-transform: uppercase; color: rgba(235,236,239,0.5); margin-bottom: 1rem; }
  .footer__col a { display: block; color: rgba(235,236,239,0.82); font-size: 0.92rem; padding-block: 0.35rem; transition: color .25s ease; }
  .footer__col a:hover { color: var(--accent-ink); }
  .footer__bottom { display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; padding-top: 1.8rem; font-family: var(--font-mono); font-size: 0.72rem; color: rgba(235,236,239,0.62); letter-spacing: 0.04em; }

  /* ============================================================
     REVEAL
     ============================================================ */
  .reveal { opacity: 0; transform: translateY(16px); transition: opacity .7s cubic-bezier(.2,.7,.2,1), transform .7s cubic-bezier(.2,.7,.2,1); }
  .reveal.in { opacity: 1; transform: none; }

  /* ============================================================
     RESPONSIVE
     ============================================================ */
  @media (max-width: 900px) {
    .nav { display: none; }
    .menu-btn { display: block; }
    .hero__lower { grid-template-columns: 1fr; gap: 1.6rem; }
    .mandate__grid, .position__grid, .om__grid, .contact__grid { grid-template-columns: 1fr; }
    .svc-grid { grid-template-columns: repeat(2, 1fr); }
    .ip-grid { grid-template-columns: repeat(2, 1fr); }
    .phases { grid-template-columns: repeat(2, 1fr); }
    .phase { border-right: 1px solid var(--line); padding-right: 1.4rem; }
    .phase:nth-child(2n) { border-right: none; padding-right: 0; }
    .phase:nth-child(-n+2) { border-bottom: 1px solid var(--line); padding-bottom: 0.4rem; }
    .sectors { grid-template-columns: repeat(2, 1fr); }
    .gauge { grid-template-columns: repeat(1, 1fr); }
    .gauge__seg { border-right: none; border-bottom: 1px solid var(--line-2); display: grid; grid-template-columns: 1fr 2fr; gap: 1rem; align-items: center; }
    .gauge__seg:last-child { border-bottom: none; }
    .gauge__bar { margin-bottom: 0; }
    .footer__top { grid-template-columns: 1fr 1fr; }
    .footer__brand { grid-column: 1 / -1; }
  }

  @media (max-width: 560px) {
    .spec { grid-template-columns: 1fr; }
    .spec__cell { border-right: none; border-bottom: 1px solid var(--line); padding-right: 0; }
    .spec__cell:last-child { border-bottom: none; }
    .nots { grid-template-columns: 1fr; }
    .svc-grid, .ip-grid, .sectors { grid-template-columns: 1fr; }
    .phases { grid-template-columns: 1fr; }
    .phase { border-right: none; padding-right: 0; border-bottom: 1px solid var(--line); padding-bottom: 0.4rem; }
    .phase:last-child { border-bottom: none; }
    .tier { grid-template-columns: 2.2rem 1fr; row-gap: 0.9rem; }
    .tier__scope { grid-column: 1 / -1; padding-left: 0; }
    .tier__price { grid-column: 2 / -1; text-align: left; }
    .reality { grid-template-columns: 2.4rem 1fr; }
    .layer { grid-template-columns: 1.1rem 1fr; }
    .layer__role { grid-column: 2 / -1; text-align: left; margin-top: 0.2rem; }
  }

  @media (prefers-reduced-motion: reduce) {
    * { scroll-behavior: auto !important; }
    .reveal { opacity: 1 !important; transform: none !important; transition: none !important; }
    .btn, .nav__link, .svc, .ip, .tier { transition: none !important; }
  }

  /* ---------- accessibility & wayfinding ---------- */
  .skip-link {
    position: absolute; left: 1rem; top: -3.5rem; z-index: 200;
    background: var(--ink); color: var(--paper);
    font-family: var(--font-mono); font-size: 0.78rem; letter-spacing: 0.04em;
    padding: 0.7em 1.1em; transition: top .2s ease;
  }
  .skip-link:focus { top: 1rem; }

  section[id], main[id] { scroll-margin-top: 78px; }

  .nav__link[aria-current="true"] { color: var(--ink); }
  .nav__link[aria-current="true"]::after { width: 100%; }

  /* ---------- FAQ ---------- */
  .faq { border-top: 1px solid var(--line); }
  .qa {
    display: grid;
    grid-template-columns: 3.4rem 1fr;
    gap: 1.4rem;
    padding: 1.7rem 0;
    border-bottom: 1px solid var(--line);
    align-items: start;
  }
  .qa__n { font-family: var(--font-mono); font-size: 0.72rem; color: var(--accent); letter-spacing: 0.06em; padding-top: 0.4rem; }
  .qa__q { font-family: var(--font-display); font-weight: 700; font-size: clamp(1.05rem, 1rem + 0.5vw, 1.3rem); letter-spacing: -0.005em; line-height: 1.25; }
  .qa__a { color: var(--ink-2); font-size: 0.96rem; line-height: 1.55; margin-top: 0.7rem; max-width: 64ch; }
  @media (max-width: 560px) { .qa { grid-template-columns: 2.2rem 1fr; } }

  /* ---------- print ---------- */
  @media print {
    .header, .mobile-nav, .menu-btn, .skip-link, .hero__actions, .form, .btn { display: none !important; }
    body { background: #fff; color: #000; }
    .section, .section--dark, .footer { background: #fff !important; color: #000 !important; border-color: #ccc !important; padding-block: 1.4rem !important; }
    .section--dark .eyebrow, .section--dark .lead, .section--dark .body-muted,
    .layer__name, .layer__role, .contact__meta a,
    .footer__col a, .footer__tag, .footer__bottom, .footer__brand .brand__word { color: #000 !important; }
    a { color: #000 !important; }
    .reveal { opacity: 1 !important; transform: none !important; }
  }

  /* ---------- aerais graphics layer ---------- */

  /* engineered tracking (brand: -0.04em display) */
  .h1 { letter-spacing: -0.038em; }
  .h2 { letter-spacing: -0.03em; }

  /* faint control-grid texture on dark canvases */
  .section--dark { overflow: hidden; }
  .section--dark > .wrap { position: relative; z-index: 1; }
  .section--dark::before {
    content: ""; position: absolute; inset: 0; z-index: 0; pointer-events: none; opacity: 0.55;
    background-image:
      linear-gradient(var(--dark-line) 1px, transparent 1px),
      linear-gradient(90deg, var(--dark-line) 1px, transparent 1px);
    background-size: 72px 72px;
    -webkit-mask-image: radial-gradient(120% 100% at 92% 0%, #000, transparent 68%);
    mask-image: radial-gradient(120% 100% at 92% 0%, #000, transparent 68%);
  }
  .stack { border-top-color: var(--dark-line); }
  .layer { border-bottom-color: var(--dark-line); }
  .layer__node { border-color: rgba(243,245,246,0.45); }

  /* hero lattice graphic */
  .hero__viz { align-self: stretch; display: flex; align-items: center; justify-content: center; min-height: 300px; }
  .hero__viz svg { width: 100%; height: auto; display: block; }

  /* service-family icons */
  .svc__icon { width: 30px; height: 30px; color: var(--ink); display: block; }
  .svc__icon svg { width: 100%; height: 100%; display: block; }
  .svc__icon .az { stroke: var(--accent); }
  .svc__icon .azf { fill: var(--accent); }

  /* signal-state legend */
  .legend {
    margin-top: clamp(2.5rem, 5vw, 3.5rem);
    padding-top: 1.7rem;
    border-top: 1px solid var(--line);
    display: flex; flex-wrap: wrap; align-items: center; gap: 1rem 2.2rem;
  }
  .legend__label { font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--ink-3); margin-right: 0.4rem; }
  .sig { display: inline-flex; align-items: center; gap: 0.65rem; font-family: var(--font-mono); font-size: 0.76rem; color: var(--ink-2); letter-spacing: 0.02em; }
  .sig .tick { width: 22px; height: 4px; display: inline-block; flex: none; }
  .sig code { font-family: var(--font-mono); color: var(--ink-3); }

  @media (max-width: 900px) {
    .hero__viz { min-height: 220px; margin-top: 0.5rem; }
  }

  /* ============================================================
     DATA → AI LAYER (the marrying narrative)
     ============================================================ */

  /* practice sub-band labels */
  .plane-label {
    display: flex; align-items: baseline; gap: 0.8rem; flex-wrap: wrap;
    font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.14em;
    text-transform: uppercase; color: var(--ink-3);
    margin: clamp(2.2rem,4vw,3rem) 0 1.1rem;
  }
  .plane-label--first { margin-top: 0; }
  .plane-label b { color: var(--ink); font-weight: 600; letter-spacing: 0.08em; }
  .plane-label .pl-tick { width: 20px; height: 4px; background: var(--accent); display: inline-block; align-self: center; }
  .plane-label .pl-muted { color: var(--ink-3); text-transform: none; letter-spacing: 0.005em; font-size: 0.8rem; font-family: var(--font-body); }

  /* integration tile — fills the 6th cell of the data grid */
  .svc--join { background: var(--ink); color: var(--paper); justify-content: center; gap: 0.75rem; }
  .svc--join:hover { background: var(--ink); }
  .svc--join .join__k { font-family: var(--font-mono); font-size: 0.66rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--accent-ink); }
  .svc--join .join__t { font-family: var(--font-display); font-weight: 600; font-size: 1.02rem; line-height: 1.25; letter-spacing: -0.01em; }
  .svc--join .join__d { font-size: 0.88rem; color: rgba(243,245,246,0.74); line-height: 1.45; }

  /* THE LOOP diagram */
  .loop { margin-top: clamp(2rem,4vw,2.8rem); border: 1px solid var(--line); background: var(--surface); }
  .loop__rail {
    display: flex; align-items: center; justify-content: center; gap: 0.7rem;
    font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.12em; text-transform: uppercase;
    padding: 0.85rem 1rem; color: var(--ink-3);
  }
  .loop__rail--feeds { border-bottom: 1px solid var(--line); }
  .loop__rail--back { border-top: 1px solid var(--line); color: var(--accent); }
  .loop__rail .arw-r, .loop__rail .arw-l { font-weight: 400; }
  .loop__body { display: grid; grid-template-columns: 1fr auto 1fr; }
  .plane { padding: 1.5rem 1.5rem 1.7rem; display: flex; flex-direction: column; gap: 0.5rem; }
  .plane__h { font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--ink); margin-bottom: 0.7rem; display: flex; align-items: center; gap: 0.55rem; }
  .plane__h .pdot { width: 7px; height: 7px; border: 1px solid var(--line-2); display: inline-block; flex: none; }
  .plane__cap { font-size: 0.9rem; color: var(--ink-2); line-height: 1.4; padding-left: 1rem; position: relative; }
  .plane__cap::before { content: ""; position: absolute; left: 0; top: 0.55em; width: 5px; height: 5px; border: 1px solid var(--line-2); }
  .seam {
    border-inline: 1px solid var(--line); background: var(--paper);
    padding: 1.5rem 1.4rem; display: flex; flex-direction: column; gap: 0.45rem;
    min-width: min(36vw, 320px);
  }
  .seam__h { font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--accent); margin-bottom: 0.55rem; display: flex; align-items: center; gap: 0.55rem; }
  .seam__h .snode { width: 9px; height: 9px; background: var(--accent); display: inline-block; flex: none; }
  .seam__cap { font-size: 0.88rem; color: var(--ink); line-height: 1.38; padding-left: 1rem; position: relative; }
  .seam__cap::before { content: ""; position: absolute; left: 0; top: 0.5em; width: 6px; height: 6px; background: var(--accent); }

  .loop__note { font-family: var(--font-mono); font-size: 0.76rem; color: var(--ink-3); letter-spacing: 0.02em; margin-top: 1.5rem; line-height: 1.65; max-width: 78ch; }
  .loop__note .accent { color: var(--accent); }
  .loop__note b { color: var(--ink); font-weight: 500; }

  /* connective capability tiles */
  .caps { margin-top: clamp(2rem,4vw,2.6rem); display: grid; grid-template-columns: repeat(5, 1fr); border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
  .cap { border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); padding: 1.4rem 1.25rem 1.6rem; display: flex; flex-direction: column; gap: 0.5rem; background: var(--paper); transition: background .3s ease; }
  .cap:hover { background: var(--surface); }
  .cap__code { font-family: var(--font-mono); font-size: 0.64rem; letter-spacing: 0.1em; color: var(--accent); }
  .cap__t { font-family: var(--font-display); font-weight: 600; font-size: 0.98rem; letter-spacing: -0.005em; line-height: 1.18; }
  .cap__d { font-size: 0.85rem; color: var(--ink-2); line-height: 1.42; }

  /* unified control crosswalk */
  .xwalk { margin-top: clamp(2rem,4vw,2.6rem); border: 1px solid var(--line-2); overflow-x: auto; }
  .xwalk__inner { min-width: 680px; }
  .xwalk__head, .xwalk__row { display: grid; grid-template-columns: 1.7fr repeat(6, 1fr) 0.95fr; align-items: stretch; }
  .xwalk__head { background: var(--surface); border-bottom: 1px solid var(--line-2); }
  .xwalk__row + .xwalk__row { border-top: 1px solid var(--line); }
  .xwalk__h { font-family: var(--font-mono); font-size: 0.6rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--ink-3); padding: 0.75rem 0.55rem; text-align: center; border-left: 1px solid var(--line); display: flex; align-items: center; justify-content: center; }
  .xwalk__h:first-child { text-align: left; border-left: none; justify-content: flex-start; }
  .xwalk__h--ai { color: var(--accent); }
  .xwalk__h--ev { color: var(--accent); }
  .xwalk__ctl { font-family: var(--font-mono); font-size: 0.76rem; color: var(--ink); padding: 0.85rem 0.8rem; line-height: 1.3; }
  .xwalk__ctl small { color: var(--ink-3); display: block; font-size: 0.66rem; margin-top: 0.25rem; letter-spacing: 0.02em; }
  .xwalk__c { padding: 0.85rem 0.55rem; display: flex; align-items: center; justify-content: center; border-left: 1px solid var(--line); }
  .xwalk__c i { width: 8px; height: 8px; display: inline-block; background: var(--ink); }
  .xwalk__c--ai i { background: var(--accent); }
  .xwalk__ev { font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.04em; color: var(--accent); display: flex; align-items: center; justify-content: center; padding: 0.85rem 0.5rem; border-left: 1px solid var(--line); }
  .xwalk__caption { font-family: var(--font-mono); font-size: 0.72rem; color: var(--ink-3); letter-spacing: 0.02em; margin-top: 1rem; line-height: 1.6; }
  .xwalk__caption .accent { color: var(--accent); }

  @media (max-width: 900px) {
    .caps { grid-template-columns: repeat(2, 1fr); }
    .loop__body { grid-template-columns: 1fr; }
    .seam { border-inline: none; border-block: 1px solid var(--line); min-width: 0; }
  }
  @media (max-width: 560px) {
    .caps { grid-template-columns: 1fr; }
  }

  /* ============================================================
     GRAPHICS: process rail · sector glyphs · value ladder · texture
     ============================================================ */

  /* Method — delivery process rail (desktop; columns carry it on mobile) */
  .flow { margin: clamp(0.4rem,1.5vw,1rem) 0 clamp(1.4rem,3vw,2.2rem); }
  .flow svg { width: 100%; height: auto; display: block; }
  @media (max-width: 900px) { .flow { display: none; } }

  /* Sectors — geometric glyphs */
  .sector__icon { width: 27px; height: 27px; color: var(--ink); display: block; margin-bottom: 0.35rem; }
  .sector__icon svg { width: 100%; height: 100%; display: block; }
  .sector__icon .az { stroke: var(--accent); }
  .sector__icon .azf { fill: var(--accent); }

  /* Engagement — land → expand value ladder */
  .ladder { margin: clamp(1.2rem,3vw,1.8rem) 0 clamp(1.6rem,3vw,2.4rem); }
  .ladder__label { font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--ink-3); display: flex; align-items: center; gap: 0.6rem; margin-bottom: 1rem; }
  .ladder__label .pl-tick { width: 20px; height: 4px; background: var(--accent); display: inline-block; }
  .ladder svg { width: 100%; height: auto; display: block; max-width: 660px; }

  /* faint control-grid texture on the most text-heavy open sections */
  #engagement, #faq { overflow: hidden; }
  #engagement > .wrap, #faq > .wrap { position: relative; z-index: 1; }
  #engagement::before, #faq::before {
    content: ""; position: absolute; inset: 0; z-index: 0; pointer-events: none; opacity: 0.4;
    background-image:
      linear-gradient(var(--line) 1px, transparent 1px),
      linear-gradient(90deg, var(--line) 1px, transparent 1px);
    background-size: 64px 64px;
    -webkit-mask-image: radial-gradient(85% 80% at 97% 3%, #000, transparent 58%);
    mask-image: radial-gradient(85% 80% at 97% 3%, #000, transparent 58%);
  }