@import url("fonts.css");

/* ============================================================
   ST3 Consulting — Shared Design System (brand.css)
   Source of truth for st3consulting.com + backflow app.
   Derived from the brand greens: forest #3F4E35, sage #5E734E.
   ============================================================ */
@layer reset, tokens, base, layout, components, utils;

/* ---------- reset ---------- */
@layer reset {
  *, *::before, *::after { box-sizing: border-box; }
  * { margin: 0; }
  html { -webkit-text-size-adjust: 100%; }
  img, svg, video { display: block; max-inline-size: 100%; height: auto; }
  button, input, select, textarea { font: inherit; color: inherit; }
  h1, h2, h3, h4 { text-wrap: balance; }
  p { text-wrap: pretty; }
  a { color: inherit; }
  ul[class] { list-style: none; padding: 0; }
}

/* ---------- design tokens ---------- */
@layer tokens {
  :root {
    /* Brand */
    --forest: #3F4E35;
    --sage:   #5E734E;
    --moss:   #7B9068;
    --sage-tint: #E9EEE2;

    /* Neutrals — biased warm-green, never pure grey */
    --paper:   #F5F7F0;
    --surface: #FCFDFB;
    --surface-2: #EFF2E9;
    --border:  #DCE2D2;
    --ink:     #1B2016;
    --muted:   #66705B;

    /* Status — distinct from the brand accent */
    --pass:    #477C3C; --pass-bg: #E4EFDD;
    --fail:    #B23A3A; --fail-bg: #F5DEDC;
    --pending: #B07A22; --pending-bg: #F6E9CF;
    --hydro:   #2C7A87; --hydro-bg: #DCEDEF;

    /* Elevation */
    --shadow-sm: 0 1px 2px rgba(27,32,22,.06), 0 1px 3px rgba(27,32,22,.05);
    --shadow-md: 0 4px 12px -2px rgba(27,32,22,.10), 0 2px 6px -2px rgba(27,32,22,.08);
    --shadow-lg: 0 18px 40px -12px rgba(27,32,22,.22), 0 6px 14px -6px rgba(27,32,22,.12);

    /* Type */
    --font-display: "Archivo", system-ui, -apple-system, "Segoe UI", sans-serif;
    --font-sans: "Hanken Grotesk", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
    --font-mono: ui-monospace, "SFMono-Regular", "Cascadia Code", "Roboto Mono", Menlo, Consolas, monospace;

    --step--1: .833rem; --step-0: 1rem; --step-1: 1.15rem;
    --step-2: 1.5rem; --step-3: 2.1rem; --step-4: clamp(2.4rem, 5vw, 3.4rem);
    --step-5: clamp(3rem, 6.5vw, 4.6rem);

    /* Radius / rhythm / layout */
    --r-sm: 6px; --r-md: 10px; --r-lg: 16px; --r-xl: 22px;
    --sp-1: .375rem; --sp-2: .625rem; --sp-3: 1rem; --sp-4: 1.5rem;
    --sp-5: 2.25rem; --sp-6: 3.5rem; --sp-7: 5rem;
    --container: 72rem;
    --measure: 65ch;
    --nav-h: 4.25rem;
  }

  @media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
      --forest: #A9C098; --sage: #8FAB7A; --moss: #A9C098; --sage-tint: #263021;
      --paper: #14180F; --surface: #1C2217; --surface-2: #242C1D; --border: #333D29;
      --ink: #ECF0E4; --muted: #9AA48C;
      --pass: #7FB06E; --pass-bg: #21301B; --fail: #E08A86; --fail-bg: #3A211F;
      --pending: #DCB05B; --pending-bg: #352A16; --hydro: #6FB9C4; --hydro-bg: #16302F;
      --shadow-sm: 0 1px 2px rgba(0,0,0,.3);
      --shadow-md: 0 6px 18px -4px rgba(0,0,0,.5);
      --shadow-lg: 0 22px 48px -14px rgba(0,0,0,.6);
    }
  }
  :root[data-theme="dark"] {
    --forest: #A9C098; --sage: #8FAB7A; --moss: #A9C098; --sage-tint: #263021;
    --paper: #14180F; --surface: #1C2217; --surface-2: #242C1D; --border: #333D29;
    --ink: #ECF0E4; --muted: #9AA48C;
    --pass: #7FB06E; --pass-bg: #21301B; --fail: #E08A86; --fail-bg: #3A211F;
    --pending: #DCB05B; --pending-bg: #352A16; --hydro: #6FB9C4; --hydro-bg: #16302F;
    --shadow-sm: 0 1px 2px rgba(0,0,0,.3);
    --shadow-md: 0 6px 18px -4px rgba(0,0,0,.5);
    --shadow-lg: 0 22px 48px -14px rgba(0,0,0,.6);
  }
}

/* ---------- base ---------- */
@layer base {
  body {
    font-family: var(--font-sans);
    font-size: var(--step-0);
    line-height: 1.65;
    color: var(--ink);
    background: var(--paper);
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
  }
  h1, h2, h3, h4, h5 { font-family: var(--font-display); font-weight: 700; line-height: 1.08; letter-spacing: -.02em; }
  h1 { font-size: var(--step-4); }
  h2 { font-size: var(--step-3); letter-spacing: -.015em; }
  h3 { font-size: var(--step-2); font-weight: 600; letter-spacing: -.01em; }
  h4 { font-size: var(--step-1); font-weight: 600; letter-spacing: -.005em; }
  a { color: var(--sage); text-underline-offset: 2px; text-decoration-color: color-mix(in srgb, var(--sage) 45%, transparent); }
  a:hover { text-decoration-color: currentColor; }
  strong { font-weight: 650; }
  :focus-visible { outline: 2.5px solid var(--hydro); outline-offset: 2px; border-radius: 3px; }
  ::selection { background: color-mix(in srgb, var(--sage) 30%, transparent); }

  .eyebrow {
    font-family: var(--font-mono);
    font-size: var(--step--1); font-weight: 600; letter-spacing: .14em;
    text-transform: uppercase; color: var(--sage);
  }
  .lede { font-size: var(--step-1); color: var(--muted); max-inline-size: var(--measure); }
}

/* ---------- layout ---------- */
@layer layout {
  .wrap { max-inline-size: var(--container); margin-inline: auto; padding-inline: var(--sp-4); }
  .wrap--narrow { max-inline-size: 52rem; }
  .section { padding-block: var(--sp-7); }
  .section--tight { padding-block: var(--sp-6); }
  .section + .section { padding-block-start: 0; }
  .stack > * + * { margin-block-start: var(--sp-3); }
  .stack-lg > * + * { margin-block-start: var(--sp-5); }
  .cluster { display: flex; flex-wrap: wrap; gap: var(--sp-2); align-items: center; }
  .grid { display: grid; gap: var(--sp-4); }
  /* Icon + text checklist: leading marker stays put, text wraps beside it (never below) */
  .check-list { list-style: none; padding: 0; margin: 0; display: grid; gap: .6rem; }
  .check-list li { display: flex; align-items: flex-start; gap: .6rem; }
  .check-list li > :first-child { flex: none; margin-block-start: .15rem; }
  .section-head { display: flex; flex-direction: column; gap: var(--sp-2); margin-block-end: var(--sp-5); max-inline-size: 46rem; }

  /* Let grid/flex children shrink below their content size so wide content
     (e.g. no-wrap tables) scrolls inside its own container instead of
     forcing horizontal overflow on the page body. */
  .hero__grid > *, .grid > *, .feature-grid > *, .trust-strip > *,
  .site-footer__grid > *, .cluster > *, .dash-grid > * { min-inline-size: 0; }
}

/* ---------- components ---------- */
@layer components {

  /* Buttons */
  .btn {
    --_bg: var(--sage); --_fg: #fff; --_bd: var(--sage);
    display: inline-flex; align-items: center; justify-content: center; gap: .55rem; cursor: pointer;
    background: var(--_bg); color: var(--_fg); border: 1.5px solid var(--_bd);
    padding: .7rem 1.3rem; border-radius: var(--r-sm); font-weight: 600;
    font-family: var(--font-sans); text-decoration: none; box-shadow: var(--shadow-sm);
    transition: transform .12s ease, filter .15s ease, background .15s ease, border-color .15s ease;
  }
  .btn:hover { filter: brightness(1.07); transform: translateY(-1px); text-decoration: none; }
  .btn:active { transform: translateY(0); }
  .btn svg { inline-size: 1.1em; block-size: 1.1em; flex: none; }
  .btn--lg svg { inline-size: 1.2em; block-size: 1.2em; }
  .btn--secondary { --_bg: transparent; --_fg: var(--sage); --_bd: var(--sage); box-shadow: none; }
  .btn--secondary:hover { --_bg: var(--sage-tint); filter: none; }
  .btn--ghost { --_bg: transparent; --_fg: var(--ink); --_bd: transparent; box-shadow: none; }
  .btn--ghost:hover { --_bg: var(--surface-2); filter: none; }
  .btn--on-dark { --_bg: #fff; --_fg: var(--forest); --_bd: #fff; }
  .btn--lg { padding: .9rem 1.7rem; font-size: var(--step-1); }
  .btn--sm { padding: .45rem .8rem; font-size: var(--step--1); }

  /* Status pills */
  .pill {
    display: inline-flex; align-items: center; gap: .4rem;
    padding: .2rem .65rem; border-radius: 999px; font-size: .78rem; font-weight: 650;
    font-family: var(--font-mono); letter-spacing: .02em;
  }
  .pill::before { content: ""; inline-size: .5rem; block-size: .5rem; border-radius: 50%; background: currentColor; }
  .pill--pass { color: var(--pass); background: var(--pass-bg); }
  .pill--fail { color: var(--fail); background: var(--fail-bg); }
  .pill--pending { color: var(--pending); background: var(--pending-bg); }
  .pill--info { color: var(--hydro); background: var(--hydro-bg); }

  .tag {
    display: inline-block; padding: .15rem .55rem; border: 1px solid var(--border);
    border-radius: var(--r-sm); font-family: var(--font-mono); font-size: .72rem;
    color: var(--muted); background: var(--surface-2);
  }

  /* Cards */
  .card {
    background: var(--surface); border: 1px solid var(--border);
    border-radius: var(--r-lg); padding: var(--sp-4);
    box-shadow: var(--shadow-sm); display: flex; flex-direction: column; gap: var(--sp-2);
  }
  .card--accent { border-inline-start: 4px solid var(--sage); }
  a.card { text-decoration: none; color: inherit; transition: transform .15s ease, box-shadow .15s ease, border-color .15s ease; }
  a.card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); border-color: color-mix(in srgb, var(--sage) 40%, var(--border)); }

  .card__icon {
    inline-size: 3rem; block-size: 3rem; border-radius: var(--r-md);
    display: grid; place-items: center; background: var(--sage-tint); color: var(--forest);
    font-size: 1.4rem;
  }

  /* KPI tile */
  .kpi { background: var(--surface); border: 1px solid var(--border); border-radius: var(--r-md); padding: var(--sp-3); box-shadow: var(--shadow-sm); }
  .kpi__label { font-size: var(--step--1); color: var(--muted); font-weight: 600; }
  .kpi__value { font-family: var(--font-display); font-size: var(--step-3); font-weight: 700; letter-spacing: -.02em; font-variant-numeric: tabular-nums; line-height: 1.1; }

  /* Forms */
  .field { display: flex; flex-direction: column; gap: .35rem; }
  .field > label { font-size: var(--step--1); font-weight: 600; }
  .field .hint { font-size: .75rem; color: var(--muted); }
  .field-error { font-size: .75rem; font-weight: 600; color: var(--fail); }
  .field-error + .input, .input.is-error { border-color: var(--fail); }

  /* Calendar (dashboard month view of Google Calendar events) */
  .cal-grid {
    display: grid; grid-template-columns: repeat(7, minmax(0, 1fr)); gap: 1px;
    background: var(--border); border: 1px solid var(--border);
    border-radius: var(--r-md); overflow: hidden;
  }
  .cal-dow {
    background: var(--surface-2); color: var(--muted);
    font-size: .7rem; font-weight: 700; letter-spacing: .04em; text-transform: uppercase;
    text-align: center; padding-block: .4rem;
  }
  .cal-cell {
    background: var(--surface); min-block-size: 5.5rem; padding: .3rem;
    display: flex; flex-direction: column; gap: .18rem;
  }
  .cal-cell.is-out { background: var(--surface-2); }
  .cal-cell.is-out .cal-daynum { color: color-mix(in srgb, var(--muted) 55%, transparent); }
  .cal-daynum {
    font-size: .76rem; font-weight: 600; color: var(--muted); align-self: flex-start;
    inline-size: 1.5rem; block-size: 1.5rem; display: grid; place-items: center; border-radius: 50%;
  }
  .cal-cell.is-today .cal-daynum { background: var(--sage); color: #fff; }
  .cal-evt {
    display: block; font-size: .72rem; line-height: 1.3; padding: .12rem .35rem;
    border-radius: var(--r-sm); text-decoration: none;
    background: color-mix(in srgb, var(--sage) 20%, transparent); color: var(--ink);
    white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
  }
  .cal-evt:hover { background: color-mix(in srgb, var(--sage) 34%, transparent); }
  .cal-evt__time { font-weight: 700; }
  .cal-notice { text-align: center; color: var(--muted); padding: var(--sp-5) var(--sp-3); }
  @media (max-width: 640px) {
    .cal-cell { min-block-size: 4rem; padding: .2rem; }
    .cal-evt { font-size: .64rem; }
  }

  /* Due-next-month list (dashboard) — flex rows so it never scrolls sideways */
  .due-row {
    display: flex; align-items: center; justify-content: space-between; gap: .6rem;
    padding-block: .6rem; border-block-end: 1px solid var(--border);
    text-decoration: none; color: var(--ink);
  }
  .due-row:last-child { border-block-end: none; }
  .due-row:hover .due-row__name { color: var(--sage); }
  .due-row__name { font-weight: 600; min-inline-size: 0; }
  .due-row__sub { display: block; font-weight: 400; font-size: .78rem; color: var(--muted); }
  .input, .select, .textarea {
    inline-size: 100%; background: var(--surface); color: var(--ink);
    border: 1.5px solid var(--border); border-radius: var(--r-sm);
    padding: .6rem .75rem; transition: border-color .15s, box-shadow .15s;
  }
  .input:focus, .select:focus, .textarea:focus {
    outline: none; border-color: var(--sage);
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--sage) 22%, transparent);
  }
  .input::placeholder, .textarea::placeholder { color: color-mix(in srgb, var(--muted) 75%, transparent); }
  .input.mono { font-family: var(--font-mono); }

  /* Invalid state (set aria-invalid="true" on the control) */
  .input[aria-invalid="true"], .select[aria-invalid="true"], .textarea[aria-invalid="true"] { border-color: var(--fail); }
  .input[aria-invalid="true"]:focus, .select[aria-invalid="true"]:focus, .textarea[aria-invalid="true"]:focus {
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--fail) 22%, transparent);
  }
  .field__error { font-size: .75rem; font-weight: 600; color: var(--fail); margin: 0; }

  /* Status banner for form results */
  .form-banner {
    display: flex; gap: .6rem; align-items: flex-start;
    padding: .8rem 1rem; border-radius: var(--r-md);
    border: 1px solid transparent; font-size: .95rem;
  }
  .form-banner__icon { flex: none; font-size: 1.1rem; line-height: 1.35; }
  .form-banner--ok    { color: var(--pass); background: var(--pass-bg); border-color: color-mix(in srgb, var(--pass) 35%, transparent); }
  .form-banner--error { color: var(--fail); background: var(--fail-bg); border-color: color-mix(in srgb, var(--fail) 35%, transparent); }

  /* Honeypot: off-screen, not focusable, hidden from AT */
  .hp-field { position: absolute !important; inline-size: 1px; block-size: 1px; padding: 0; margin: -1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; border: 0; }

  /* Table */
  .table-scroll { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--r-md); }
  table.data { inline-size: 100%; border-collapse: collapse; background: var(--surface); font-size: .92rem; }
  table.data th, table.data td { text-align: start; padding: .7rem .85rem; border-block-end: 1px solid var(--border); white-space: nowrap; }
  table.data thead th { font-size: .72rem; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); font-weight: 700; background: var(--surface-2); }
  table.data tbody tr:last-child td { border-block-end: none; }
  table.data .num { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }

  /* ----- Site header / nav ----- */
  .site-header {
    position: sticky; inset-block-start: 0; z-index: 50;
    background: color-mix(in srgb, var(--paper) 88%, transparent);
    backdrop-filter: blur(12px);
    border-block-end: 1px solid var(--border);
  }
  .site-header__bar { display: flex; align-items: center; justify-content: space-between; gap: var(--sp-4); block-size: var(--nav-h); }
  .brand-lockup { display: inline-flex; align-items: center; gap: .6rem; text-decoration: none; color: var(--ink); font-weight: 700; }
  .brand-lockup img { block-size: 2.4rem; inline-size: auto; }
  .brand-lockup .brand-name { font-family: var(--font-display); font-size: 1.35rem; font-weight: 700; letter-spacing: -.02em; color: var(--forest); }
  .brand-lockup .brand-sub { font-family: var(--font-mono); font-size: .62rem; letter-spacing: .12em; text-transform: uppercase; color: var(--muted); display: block; line-height: 1; margin-block-start: 2px; }

  .primary-nav { display: flex; align-items: center; gap: var(--sp-1); }
  .primary-nav a {
    text-decoration: none; color: var(--ink); font-weight: 550; font-size: .95rem;
    padding: .5rem .7rem; border-radius: var(--r-sm); transition: background .15s, color .15s;
  }
  .primary-nav a:hover { background: var(--surface-2); color: var(--forest); }
  .primary-nav a[aria-current="page"] { color: var(--forest); background: var(--sage-tint); }
  .nav-cta { margin-inline-start: var(--sp-2); }

  .nav-toggle { display: none; background: none; border: 1.5px solid var(--border); border-radius: var(--r-sm); padding: .45rem .6rem; cursor: pointer; }
  .nav-toggle svg { inline-size: 1.35rem; block-size: 1.35rem; }

  /* mobile nav */
  @media (max-width: 60rem) {
    .nav-toggle { display: inline-flex; }
    .primary-nav {
      position: fixed; inset: var(--nav-h) 0 auto 0; flex-direction: column; align-items: stretch;
      gap: 0; background: var(--surface); border-block-end: 1px solid var(--border);
      padding: var(--sp-2); box-shadow: var(--shadow-lg);
      transform: translateY(-8px); opacity: 0; visibility: hidden; transition: opacity .18s, transform .18s, visibility .18s;
    }
    .primary-nav[data-open="true"] { transform: translateY(0); opacity: 1; visibility: visible; }
    .primary-nav a { padding: .8rem .9rem; font-size: 1.05rem; }
    .nav-cta { margin: var(--sp-2) 0 0; }
  }

  /* ----- Hero ----- */
  .hero { position: relative; overflow: clip; padding-block: var(--sp-7); background: linear-gradient(160deg, var(--surface) 0%, var(--sage-tint) 120%); border-block-end: 1px solid var(--border); }
  .hero__grid { display: grid; gap: var(--sp-5); align-items: center; }
  @media (min-width: 56rem) { .hero__grid { grid-template-columns: 1.1fr .9fr; } }
  .hero h1 { font-size: var(--step-5); margin-block: var(--sp-2); }
  .hero__accent { color: var(--sage); }
  .hero__logo { display: grid; place-items: center; }
  .hero__logo img {
    inline-size: min(100%, 22rem); height: auto;
    border-radius: var(--r-xl); box-shadow: var(--shadow-lg);
  }

  /* ----- Feature grid ----- */
  .feature-grid { display: grid; gap: var(--sp-4); grid-template-columns: repeat(auto-fit, minmax(min(100%, 15rem), 1fr)); }

  /* ----- Alternating service row (image + content) ----- */
  .service-row { display: grid; gap: var(--sp-4); align-items: center; }
  .service-media img {
    inline-size: 100%; aspect-ratio: 3 / 2; object-fit: cover;
    border-radius: var(--r-lg); border: 1px solid var(--border); box-shadow: var(--shadow-md);
  }
  .service-row__body { display: flex; flex-direction: column; gap: var(--sp-2); }
  .service-features { display: flex; flex-direction: column; gap: .55rem; padding: 0; list-style: none; margin-block: var(--sp-1); }
  .service-features li { display: flex; gap: .55rem; align-items: flex-start; }
  .service-features li::before { content: "\2713"; color: var(--sage); font-weight: 700; line-height: 1.5; }
  @media (min-width: 52rem) {
    .service-row { grid-template-columns: 1fr 1fr; gap: var(--sp-6); }
    .service-row--flip .service-media { order: 2; }
  }

  /* ----- Founder / portrait ----- */
  .founder-row { display: grid; gap: var(--sp-5); align-items: center; }
  .portrait {
    inline-size: 100%; aspect-ratio: 4 / 5; object-fit: cover; max-inline-size: 22rem;
    border-radius: var(--r-lg); border: 1px solid var(--border); box-shadow: var(--shadow-md);
  }
  @media (min-width: 52rem) {
    .founder-row { grid-template-columns: 20rem 1fr; gap: var(--sp-6); }
  }

  /* ----- Info bar (trust strip) ----- */
  .trust-strip { display: grid; gap: var(--sp-3); grid-template-columns: repeat(auto-fit, minmax(min(100%, 12rem), 1fr)); padding-block: var(--sp-4); border-block: 1px solid var(--border); }
  .trust-strip .item { display: flex; gap: .6rem; align-items: center; }
  .trust-strip .item b { font-family: var(--font-display); }

  /* ----- CTA band ----- */
  .cta-band { background: var(--forest); color: #EEF3E8; border-radius: var(--r-xl); padding: clamp(2rem, 5vw, 3.5rem); text-align: center; box-shadow: var(--shadow-lg); }
  .cta-band h2 { color: #fff; }
  .cta-band p { color: color-mix(in srgb, #fff 78%, var(--forest)); max-inline-size: 42rem; margin-inline: auto; }
  :root[data-theme="dark"] .cta-band, :root:not([data-theme="light"]) .cta-band { background: #202719; }

  /* ----- Breadcrumb / prose ----- */
  .breadcrumb { font-size: var(--step--1); color: var(--muted); display: flex; gap: .5rem; flex-wrap: wrap; }
  .breadcrumb a { color: var(--muted); text-decoration: none; }
  .breadcrumb a:hover { color: var(--sage); }
  .prose { max-inline-size: var(--measure); }
  .prose > * + * { margin-block-start: var(--sp-3); }
  .prose h2 { margin-block-start: var(--sp-5); }
  .prose h3 { margin-block-start: var(--sp-4); }
  .prose ul, .prose ol { padding-inline-start: 1.3em; display: flex; flex-direction: column; gap: .4rem; }

  /* FAQ accordion — native <details>/<summary> */
  .faq { display: flex; flex-direction: column; gap: var(--sp-2); }
  .faq-item { border: 1px solid var(--border); border-radius: var(--r-md); background: var(--surface); }
  .faq-item > summary {
    cursor: pointer; list-style: none; padding: var(--sp-3);
    font-weight: 600; font-size: var(--step-0);
    display: flex; justify-content: space-between; align-items: center; gap: var(--sp-3);
  }
  .faq-item > summary::-webkit-details-marker { display: none; }
  .faq-item > summary::after {
    content: "+"; flex: none; font-family: var(--font-mono); color: var(--sage);
    font-size: 1.35em; line-height: 1; transition: transform .2s ease;
  }
  .faq-item[open] > summary::after { transform: rotate(45deg); }
  .faq-item > summary:hover { color: var(--sage); }
  .faq-item > summary:focus-visible { outline: 2px solid var(--sage); outline-offset: -2px; border-radius: var(--r-md); }
  .faq-item__body { padding: 0 var(--sp-3) var(--sp-3); color: var(--muted); max-inline-size: var(--measure); }

  /* ----- Site footer ----- */
  .site-footer { background: var(--surface-2); border-block-start: 1px solid var(--border); padding-block: var(--sp-6) var(--sp-4); margin-block-start: var(--sp-6); }
  .site-footer__grid { display: grid; gap: var(--sp-5); grid-template-columns: repeat(auto-fit, minmax(min(100%, 13rem), 1fr)); }
  .site-footer h5 { font-family: var(--font-mono); font-size: .72rem; letter-spacing: .12em; text-transform: uppercase; color: var(--muted); font-weight: 600; margin-block-end: var(--sp-2); }
  .site-footer a { color: var(--ink); text-decoration: none; font-size: .95rem; }
  .site-footer a:hover { color: var(--sage); }
  .site-footer__links { display: flex; flex-direction: column; gap: .5rem; }
  .site-footer__legal { margin-block-start: var(--sp-5); padding-block-start: var(--sp-3); border-block-start: 1px solid var(--border); display: flex; justify-content: space-between; flex-wrap: wrap; gap: var(--sp-2); color: var(--muted); font-size: var(--step--1); }

  /* ============================================================
     App shell (backflow.st3consulting.com) — sidebar + topbar
     ============================================================ */
  .app-layout { display: grid; grid-template-columns: 16rem 1fr; min-block-size: 100vh; }

  /* Scrim is always fixed (out of grid flow); only shown when the mobile sidebar opens. */
  .app-scrim { position: fixed; inset: 0; background: rgba(0,0,0,.45); z-index: 55; opacity: 0; visibility: hidden; transition: opacity .2s; }
  .app-scrim[data-open="true"] { opacity: 1; visibility: visible; }

  .app-sidebar {
    position: sticky; inset-block-start: 0; block-size: 100vh; overflow-y: auto; overflow-x: hidden;
    background: var(--surface); border-inline-end: 1px solid var(--border);
    display: flex; flex-direction: column; gap: var(--sp-4); padding: var(--sp-4) var(--sp-3);
    scrollbar-width: thin;                                       /* Firefox */
    scrollbar-color: color-mix(in srgb, var(--muted) 35%, transparent) transparent;
    scrollbar-gutter: stable;
  }
  .app-sidebar::-webkit-scrollbar { inline-size: 8px; }         /* Chromium / Safari */
  .app-sidebar::-webkit-scrollbar-track { background: transparent; }
  .app-sidebar::-webkit-scrollbar-thumb {
    background: color-mix(in srgb, var(--muted) 30%, transparent);
    border-radius: 999px; border: 2px solid transparent; background-clip: padding-box;
  }
  .app-sidebar:hover::-webkit-scrollbar-thumb { background: color-mix(in srgb, var(--muted) 45%, transparent); background-clip: padding-box; }
  .app-sidebar__brand { display: flex; align-items: center; gap: .6rem; padding-inline: .4rem; text-decoration: none; color: var(--ink); }
  .app-sidebar__brand img { inline-size: 2rem; block-size: 2rem; }
  .app-sidebar__brand .brand-name { font-family: var(--font-display); font-weight: 700; font-size: 1.05rem; color: var(--ink); line-height: 1.1; }
  .app-sidebar__brand .brand-sub { display: block; font-size: .68rem; color: var(--muted); font-weight: 600; letter-spacing: .04em; }

  .app-nav { display: flex; flex-direction: column; gap: var(--sp-3); }
  .app-nav__group { display: flex; flex-direction: column; gap: .15rem; }
  .app-nav__label { font-family: var(--font-mono); font-size: .66rem; letter-spacing: .12em; text-transform: uppercase; color: var(--muted); padding-inline: .6rem; margin-block-end: .3rem; }
  .app-nav__link { display: flex; align-items: center; gap: .7rem; padding: .55rem .6rem; border-radius: var(--r-md); color: var(--muted); text-decoration: none; font-weight: 600; font-size: .92rem; transition: background .12s, color .12s; }
  .app-nav__link svg { inline-size: 1.15rem; block-size: 1.15rem; flex: none; }
  .app-nav__link:hover { background: var(--surface-2); color: var(--ink); }
  .app-nav__link[aria-current="page"] { background: color-mix(in srgb, var(--sage) 18%, transparent); color: var(--forest); }
  :root[data-theme="dark"] .app-nav__link[aria-current="page"] { color: var(--ink); }
  @media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .app-nav__link[aria-current="page"] { color: var(--ink); } }
  .app-sidebar__foot { margin-block-start: auto; font-size: .75rem; color: var(--muted); padding-inline: .6rem; }

  .app-main { display: flex; flex-direction: column; min-inline-size: 0; background: var(--surface-2); }
  .app-topbar { display: flex; align-items: center; gap: var(--sp-3); padding: var(--sp-3) var(--sp-4); background: var(--surface); border-block-end: 1px solid var(--border); position: sticky; inset-block-start: 0; z-index: 20; }
  .app-topbar__spacer { flex: 1; }
  .app-topbar__menu { display: none; }

  .app-search { display: flex; align-items: center; gap: .5rem; background: var(--surface-2); border: 1px solid var(--border); border-radius: var(--r-md); padding: .45rem .7rem; color: var(--muted); inline-size: min(24rem, 38vw); }
  .app-search svg { inline-size: 1.05rem; block-size: 1.05rem; flex: none; }
  .app-search input { border: none; background: transparent; color: var(--ink); inline-size: 100%; outline: none; font-size: .9rem; }
  .app-search input::placeholder { color: var(--muted); }

  /* Global search: topbar dropdown */
  .app-search-wrap { position: relative; inline-size: min(24rem, 38vw); }
  .app-search-wrap .app-search { inline-size: 100%; }
  .search-results {
    position: absolute; inset-block-start: calc(100% + .35rem); inset-inline: 0; z-index: 60;
    background: var(--surface); border: 1px solid var(--border); border-radius: var(--r-md);
    box-shadow: var(--shadow-lg); max-block-size: 70vh; overflow-y: auto; padding: .35rem;
  }
  .search-group { font-family: var(--font-mono); font-size: .64rem; letter-spacing: .12em; text-transform: uppercase; color: var(--muted); padding: .55rem .6rem .2rem; }
  .search-item { display: flex; flex-direction: column; gap: .1rem; padding: .5rem .6rem; border-radius: var(--r-sm); text-decoration: none; color: var(--ink); }
  .search-item:hover, .search-item.is-active { background: var(--surface-2); }
  .search-item__label { font-weight: 600; font-size: .92rem; }
  .search-item__sub { font-size: .8rem; color: var(--muted); }
  .search-empty { padding: var(--sp-3); color: var(--muted); font-size: .9rem; text-align: center; }

  .icon-btn { display: inline-grid; place-items: center; inline-size: 2.25rem; block-size: 2.25rem; border-radius: var(--r-md); border: 1px solid var(--border); background: var(--surface); color: var(--muted); cursor: pointer; transition: color .12s, background .12s; }
  .icon-btn:hover { color: var(--ink); background: var(--surface-2); }
  .icon-btn svg { inline-size: 1.15rem; block-size: 1.15rem; }
  .icon-btn--sm { inline-size: 1.85rem; block-size: 1.85rem; }
  .icon-btn--sm svg { inline-size: 1rem; block-size: 1rem; }
  .icon-btn--badge { position: relative; text-decoration: none; }
  .icon-btn__badge { position: absolute; top: -4px; inset-inline-end: -4px; min-inline-size: 1.05rem; block-size: 1.05rem; padding: 0 .28rem; display: grid; place-items: center; border-radius: 999px; background: #c9403f; color: #fff; font-size: .66rem; font-weight: 700; line-height: 1; border: 2px solid var(--surface); }
  .row-actions { display: flex; gap: .35rem; }
  .row-actions a:hover { color: var(--sage); }

  /* List toolbar (search + filters + actions) */
  .toolbar { display: flex; flex-wrap: wrap; gap: var(--sp-2); align-items: center; margin-block-end: var(--sp-4); }
  .toolbar__spacer { flex: 1 1 auto; }
  .toolbar .input, .toolbar .select { inline-size: auto; }
  .toolbar .input[type="search"] { min-inline-size: 15rem; }
  .count-note { font-size: .85rem; color: var(--muted); }

  /* Filter tabs (list views) */
  .tabs { display: flex; gap: .15rem; flex-wrap: wrap; border-block-end: 1px solid var(--border); margin-block-end: var(--sp-4); }
  .tabs a { padding: .5rem .85rem; font-size: .9rem; font-weight: 600; color: var(--muted); text-decoration: none; border-block-end: 2px solid transparent; margin-block-end: -1px; white-space: nowrap; }
  .tabs a:hover { color: var(--ink); }
  .tabs a[aria-current="page"] { color: var(--sage); border-block-end-color: var(--sage); }
  .tabs a .count { font-size: .8em; opacity: .7; }

  /* Clickable data rows + in-cell links */
  .data tbody tr.row-link { cursor: pointer; }
  .data tbody tr.row-link:hover { background: var(--surface-2); }
  .data a.cell-link { color: var(--ink); text-decoration: none; font-weight: 600; }
  .data a.cell-link:hover { color: var(--sage); }
  .data tbody tr.is-hidden, tr.is-hidden { display: none; }

  /* Definition-list detail blocks (record view) */
  .detail-list { display: grid; grid-template-columns: auto 1fr; gap: .55rem var(--sp-4); margin: 0; font-size: .92rem; align-items: baseline; }
  .detail-list dt { color: var(--muted); font-weight: 600; white-space: nowrap; }
  .detail-list dd { margin: 0; text-align: end; }

  /* Record header (name + meta + actions) */
  .record-head { display: flex; flex-wrap: wrap; align-items: flex-start; justify-content: space-between; gap: var(--sp-3); margin-block-end: var(--sp-4); }
  .record-head h1 { font-size: var(--step-3); margin: 0; }
  .record-head .cluster { gap: .5rem; margin-block-start: .4rem; }

  .form-banner--info { color: var(--hydro); background: var(--hydro-bg); border-color: color-mix(in srgb, var(--hydro) 35%, transparent); }
  .form-banner--warn { color: var(--pending); background: var(--pending-bg); border-color: color-mix(in srgb, var(--pending) 35%, transparent); }

  /* Big pass/fail result banner (test detail) */
  .result-banner { border-radius: var(--r-lg); padding: var(--sp-4); text-align: center; font-family: var(--font-display); font-weight: 700; font-size: var(--step-3); letter-spacing: -.01em; margin-block-end: var(--sp-4); }
  .result-banner small { display: block; font-family: var(--font-sans); font-size: var(--step--1); font-weight: 600; letter-spacing: 0; opacity: .8; margin-block-start: .25rem; }
  .result-banner--pass { background: var(--pass-bg); color: var(--pass); }
  .result-banner--fail { background: var(--fail-bg); color: var(--fail); }
  .result-banner--pending { background: var(--pending-bg); color: var(--pending); }

  /* Field Test Wizard */
  .ft-wrap { max-inline-size: 40rem; margin-inline: auto; }
  .ft-progress { block-size: 8px; background: var(--surface-2); border-radius: 999px; overflow: hidden; margin-block-end: var(--sp-3); }
  .ft-progress > i { display: block; block-size: 100%; background: var(--sage); border-radius: 999px; transition: inline-size .3s ease; }
  .ft-step-meta { display: flex; justify-content: space-between; gap: var(--sp-2); font-size: .82rem; color: var(--muted); margin-block-end: .5rem; }
  .ft-section { font-family: var(--font-mono); font-size: .72rem; letter-spacing: .1em; text-transform: uppercase; color: var(--sage); font-weight: 600; }
  .ft-instruction { font-size: var(--step-2); line-height: 1.35; font-weight: 500; margin: 0; }
  .ft-note { color: var(--muted); font-size: .9rem; margin-block-start: var(--sp-3); border-inline-start: 3px solid var(--pending); padding-inline-start: .7rem; }
  .ft-wrap .input, .ft-wrap .select { font-size: var(--step-1); padding: .7rem .8rem; }
  .ft-nav { display: flex; gap: .6rem; align-items: center; margin-block-start: var(--sp-4); }
  .ft-nav .spacer { flex: 1; }

  /* Customer portal top bar */
  .portal-topbar { border-block-end: 1px solid var(--border); background: var(--surface); position: sticky; inset-block-start: 0; z-index: 20; }
  .portal-topbar__bar { display: flex; align-items: center; justify-content: space-between; gap: var(--sp-3); padding-block: var(--sp-3); flex-wrap: wrap; }
  .portal-nav { display: flex; gap: var(--sp-3); align-items: center; }
  .portal-nav a { color: var(--muted); text-decoration: none; font-weight: 600; font-size: .95rem; }
  .portal-nav a:hover { color: var(--ink); }
  .portal-nav a[aria-current="page"] { color: var(--sage); }
  .avatar { inline-size: 2.25rem; block-size: 2.25rem; border-radius: 50%; background: var(--forest); color: #fff; display: grid; place-items: center; font-weight: 700; font-size: .8rem; font-family: var(--font-display); flex: none; }

  .app-content { inline-size: 100%; max-inline-size: var(--container); margin-inline: auto; padding: var(--sp-5) var(--sp-4) var(--sp-6); }
  .page-head { display: flex; align-items: flex-end; justify-content: space-between; gap: var(--sp-3); flex-wrap: wrap; margin-block-end: var(--sp-4); }
  .page-head h1 { font-size: var(--step-3); margin: 0; }
  .page-head .lede { margin-block-start: .3rem; font-size: var(--step-0); }

  /* KPI stat cards */
  .stat-grid { display: grid; gap: var(--sp-3); grid-template-columns: repeat(auto-fit, minmax(min(100%, 13rem), 1fr)); margin-block-end: var(--sp-4); }
  .stat-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--r-lg); padding: var(--sp-3); box-shadow: var(--shadow-sm); display: flex; flex-direction: column; gap: .5rem; }
  .stat-card__top { display: flex; align-items: center; justify-content: space-between; gap: .5rem; }
  .stat-card__label { font-size: var(--step--1); color: var(--muted); font-weight: 600; }
  .stat-card__icon { inline-size: 2.1rem; block-size: 2.1rem; border-radius: var(--r-md); display: grid; place-items: center; background: var(--sage-tint); color: var(--forest); flex: none; }
  .stat-card__icon svg { inline-size: 1.15rem; block-size: 1.15rem; }
  .stat-card--warn .stat-card__icon { background: var(--pending-bg); color: var(--pending); }
  .stat-card--bad .stat-card__icon  { background: var(--fail-bg); color: var(--fail); }
  .stat-card__value { font-family: var(--font-display); font-size: var(--step-4); font-weight: 700; line-height: 1; letter-spacing: -.02em; font-variant-numeric: tabular-nums; }
  .stat-card__meta { font-size: .8rem; color: var(--muted); }

  /* Dashboard 2-column split (charts / side panel) */
  .dash-grid { display: grid; gap: var(--sp-4); grid-template-columns: minmax(0, 1.7fr) minmax(0, 1fr); align-items: start; }
  .panel-head { display: flex; align-items: center; justify-content: space-between; gap: var(--sp-2); margin-block-end: var(--sp-3); }
  .panel-head h2 { font-size: var(--step-1); margin: 0; }
  .panel-head a { font-size: .85rem; color: var(--sage); font-weight: 600; text-decoration: none; }
  .chart-box { position: relative; block-size: 16rem; }
  .chart-box--sm { block-size: 12rem; }

  /* Activity feed */
  .activity { display: flex; flex-direction: column; gap: var(--sp-3); }
  .activity__item { display: flex; gap: .7rem; }
  .activity__dot { inline-size: .55rem; block-size: .55rem; border-radius: 50%; background: var(--sage); margin-block-start: .4rem; flex: none; }
  .activity__dot--pass { background: var(--pass); } .activity__dot--fail { background: var(--fail); }
  .activity__body { font-size: .9rem; } .activity__body b { font-weight: 700; }
  .activity__meta { font-size: .76rem; color: var(--muted); margin-block-start: .1rem; }

  @media (max-width: 60rem) {
    .app-layout { grid-template-columns: 1fr; }
    .app-sidebar { position: fixed; inset-block: 0; inset-inline-start: 0; inline-size: 15rem; z-index: 60; transform: translateX(-105%); transition: transform .2s ease; box-shadow: var(--shadow-lg); }
    .app-sidebar[data-open="true"] { transform: none; }
    .app-topbar__menu { display: inline-grid; }
    .dash-grid { grid-template-columns: minmax(0, 1fr); }
    /* Topbar: actions stay on row 1 (never squish), search drops to its own full-width row 2 */
    .app-topbar { flex-wrap: wrap; row-gap: var(--sp-2); }
    .app-topbar .btn, .app-topbar .icon-btn, .app-topbar .avatar { flex: none; }
    .app-topbar .btn span { display: none; }          /* Quick add → icon-only on mobile */
    .app-topbar .btn { padding-inline: .6rem; }
    .app-search-wrap { order: 10; flex: 1 0 100%; inline-size: 100%; }
    .app-search { inline-size: 100%; }
  }
}

/* ---------- utilities ---------- */
@layer utils {
  .muted { color: var(--muted); }
  .center { text-align: center; }
  .mono { font-family: var(--font-mono); }
  .visually-hidden { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }
  .mt-0 { margin-block-start: 0; }

  /* Logo swaps with theme: colour mark on light grounds, white mark on dark */
  .logo-dark { display: none; }
  .logo-light { display: block; }
  :root[data-theme="dark"] .logo-light { display: none; }
  :root[data-theme="dark"] .logo-dark { display: block; }
  @media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) .logo-light { display: none; }
    :root:not([data-theme="light"]) .logo-dark { display: block; }
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; scroll-behavior: auto !important; }
  .btn:hover, a.card:hover { transform: none; }
}