/* ============================================================================
   INERTIA LONGEVITY CLUB — Design System
   Single source of truth. Inner pages (protocol / space / membership / find-us)
   are built on these tokens + generic components. Do not fork per-page styles.

   Contents
   0. Font face
   1. Tokens (color / type / space / radius / motion)
   2. Reset + base
   3. Typography helpers (Conthrax display, eyebrows, numerals)
   4. Layout (wrap, panel, section, rules/hairlines)
   5. Nav pill
   6. Buttons + tags
   7. Hero panel
   8. Cards + bento
   9. Ledger (floor table)
   10. Forms (consultation)
   11. Footer
   12. Placeholder (awaiting-photography)
   13. Motion (entrance) + reduced-motion
   14. Responsive (~900px, ~640px)
   15. Utilities
   ========================================================================== */

/* 0. FONT ------------------------------------------------------------------ */
@font-face {
  font-family: 'Conthrax';
  src: url('static/fonts/Conthrax-SemiBold.otf') format('opentype');
  font-weight: 600;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: 'Hanken Grotesk';
  src: url('static/fonts/HankenGrotesk-Variable.ttf') format('truetype');
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'Hanken Grotesk';
  src: url('static/fonts/HankenGrotesk-Italic-Variable.ttf') format('truetype');
  font-weight: 100 900;
  font-style: italic;
  font-display: swap;
}

/* 1. TOKENS ---------------------------------------------------------------- */
:root {
  /* Palette — exact brand hexes; --paper is the sanctioned web derivative */
  --brown:      #3D2B20;
  --brown-deep: #2A1D15;
  --gold:       #F6E0A3;
  --bronze:     #C8AA6E;
  --paper:      #FBF4E0;

  /* Derived surfaces / inks (alpha over base — never new hues) */
  --brown-panel:   #1E140D;                    /* photographic panel base */
  --gold-line:     rgba(246, 224, 163, 0.28);  /* hairline @ ~28% */
  --gold-line-soft:rgba(246, 224, 163, 0.16);
  --ink-on-brown:  rgba(251, 244, 224, 0.82);
  --ink-on-brown-dim: rgba(251, 244, 224, 0.6);
  --ink-on-paper-dim: rgba(61, 43, 32, 0.62);
  --hair-on-paper: rgba(61, 43, 32, 0.12);

  /* Type */
  --font-display: 'Conthrax', 'Arial Narrow', Arial, sans-serif; /* SIGNAGE ONLY: eyebrows, numerals, floor plates, buttons, small labels */
  --font-head:    'Hanken Grotesk', Arial, sans-serif;           /* all display headings */
  --font-body:    'Hanken Grotesk', Arial, 'Helvetica Neue', sans-serif;

  /* Type scale (px) — 12 / 14 / 17 / 22 / 28 / 40 / 56 / 88 */
  --t-12: 12px;
  --t-14: 14px;
  --t-17: 17px;
  --t-22: 22px;
  --t-28: 28px;
  --t-40: 40px;
  --t-56: 56px;
  --t-88: 88px;

  /* Fluid display sizes */
  --t-hero: clamp(34px, 6vw, 68px);
  --t-h2:   clamp(24px, 3.4vw, 40px);
  --t-lead: clamp(19px, 2.2vw, 26px);

  /* Spacing */
  --sp-1: 8px;
  --sp-2: 16px;
  --sp-3: 24px;
  --sp-4: 32px;
  --sp-5: 48px;
  --sp-6: 72px;
  --sp-7: 96px;
  --sp-8: 120px;
  --sp-9: 160px;
  --section-pad: clamp(72px, 11vw, 150px); /* vertical section rhythm */

  /* Layout */
  --wrap: 1180px;
  --gutter: 24px;

  /* Radius */
  --r-lg: 30px;    /* hero / footer panels */
  --r-md: 22px;    /* cards */
  --r-input: 10px; /* the only radius between 0 and 22 (inputs) */
  --r-pill: 999px;

  /* Motion */
  --micro: 200ms;
  --entrance: 620ms;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);

  /* Tracking */
  --track-label: 0.32em; /* small Conthrax labels */
  --track-nav:   0.2em;
}

/* 2. RESET + BASE ---------------------------------------------------------- */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  background: var(--paper);
  color: var(--brown);
  font-family: var(--font-body);
  font-size: var(--t-17);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
img, video, svg { display: block; max-width: 100%; }
a { color: inherit; }
::selection { background: var(--gold); color: var(--brown-deep); }

/* Focus — deliberate gold ring, never browser blue */
:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 2px;
  border-radius: 2px;
}

/* Skip link */
.skip-link {
  position: absolute; left: -999px; top: 0; z-index: 100;
  background: var(--brown); color: var(--paper);
  padding: 12px 20px; border-radius: 0 0 var(--r-input) 0;
  font-family: var(--font-display); font-size: var(--t-12);
  letter-spacing: var(--track-label); text-transform: uppercase;
}
.skip-link:focus { left: 0; }

/* 3. TYPOGRAPHY HELPERS ---------------------------------------------------- */
.conx {
  /* display heading — Hanken, sentence case (Conthrax demoted to signage 10 Jul) */
  font-family: var(--font-head);
  font-weight: 700;
  letter-spacing: -0.015em;
  text-transform: none;
}
.eyebrow {
  font-family: var(--font-display);
  text-transform: uppercase;
  font-size: var(--t-12);
  letter-spacing: var(--track-label);
  line-height: 1.4;
}
.eyebrow--bronze { color: var(--bronze); }
.eyebrow--gold   { color: var(--gold); }

.numeral { font-family: var(--font-display); font-variant-numeric: tabular-nums; }

h1, h2, h3 { font-weight: 600; line-height: 1.05; }
p { text-wrap: pretty; }

/* 4. LAYOUT ---------------------------------------------------------------- */
.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 var(--gutter); }
.wrap--narrow { max-width: 820px; }

/* Section — vertical rhythm, generous air */
.section { padding-block: var(--section-pad); }
.section--tight { padding-block: clamp(56px, 8vw, 100px); }

/* .panel — a rounded surface floating on the paper ground (Solidroad structure) */
.panel {
  border-radius: var(--r-lg);
  overflow: hidden;
  position: relative;
}
.panel--brown { background: var(--brown); color: var(--paper); }
.panel--deep  { background: var(--brown-deep); color: var(--paper); }

/* Gold hairline — the structural signature device */
.hairline {
  height: 1px; width: 100%;
  background: var(--gold-line);
  transform-origin: left center;
}
.hairline--on-paper { background: var(--hair-on-paper); }

/* Section-head block (eyebrow + heading) */
.section-head { margin-bottom: var(--sp-5); }
.section-head .eyebrow { margin-bottom: var(--sp-2); }
.section-head h2 { font-size: var(--t-h2); font-family: var(--font-head); font-weight: 700; letter-spacing: -0.015em; }

/* Thesis / lead paragraph block (paper "document" register) */
.thesis { max-width: 760px; }
.thesis .eyebrow { color: var(--bronze); margin-bottom: 22px; }
.thesis p { font-size: var(--t-lead); line-height: 1.5; color: var(--brown); }
.thesis p + p { margin-top: 20px; }
.thesis .credit { margin-top: 26px; font-size: 14px; color: var(--ink-on-paper-dim); }

/* Media panel — dark rounded panel carrying a background photograph */
.media-panel {
  position: relative; border-radius: var(--r-lg); overflow: hidden;
  background: var(--brown-panel); color: var(--paper);
  padding: clamp(48px, 7vw, 96px) clamp(28px, 5vw, 72px);
}
.media-panel__bg { position: absolute; inset: 0; width: 100%; height: 100%;
  object-fit: cover; opacity: 0.28; }
.media-panel::after { content: ""; position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(30,20,13,0.55), rgba(30,20,13,0.82)); }
.media-panel > * { position: relative; z-index: 2; }

/* Floor indicator — fixed Conthrax numeral, desktop only */
.floor-indicator {
  position: fixed; top: 96px; right: 28px; z-index: 30;
  font-family: var(--font-display); font-variant-numeric: tabular-nums;
  font-size: 13px; letter-spacing: 0.24em; color: var(--brown);
  background: rgba(251, 244, 224, 0.82); backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--hair-on-paper); border-radius: var(--r-pill);
  padding: 8px 16px; pointer-events: none;
}
@media (max-width: 1100px) { .floor-indicator { display: none; } }

/* 5. NAV PILL -------------------------------------------------------------- */
/* Kept IDENTICAL between pages — inner pages copy this block verbatim. */
.nav {
  position: sticky; top: 18px; z-index: 40;
  margin: 18px auto 0; max-width: 1120px;
  display: flex; align-items: center; justify-content: space-between;
  background: rgba(251, 244, 224, 0.82);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--hair-on-paper);
  border-radius: var(--r-pill);
  padding: 12px 14px 12px 26px;
  box-shadow: 0 10px 30px rgba(61, 43, 32, 0.08);
}
.nav__brand { display: inline-flex; align-items: center; gap: 10px; }
.nav__brand img { height: 22px; width: auto; }
.nav__brand, .nav__brand span {
  font-family: var(--font-display); font-weight: 600;
  font-size: 15px; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--brown); text-decoration: none;
}
.nav__links {
  display: flex; gap: 30px; list-style: none;
  font-family: var(--font-body); font-weight: 600;
  font-size: 12px; letter-spacing: 0.14em; text-transform: uppercase;
}
.nav__links a {
  color: var(--ink-on-paper-dim); text-decoration: none;
  transition: color var(--micro) var(--ease-out);
}
.nav__links a:hover, .nav__links a[aria-current="page"] { color: var(--brown); }
.nav__toggle { display: none; }

/* 6. BUTTONS + TAGS -------------------------------------------------------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  font-family: var(--font-display); font-weight: 600;
  font-size: 10px; letter-spacing: 0.22em; text-transform: uppercase;
  padding: 13px 24px; border-radius: var(--r-pill);
  border: 1px solid transparent; text-decoration: none; cursor: pointer;
  transition: transform var(--micro) var(--ease-out),
              background var(--micro) var(--ease-out),
              color var(--micro) var(--ease-out),
              border-color var(--micro) var(--ease-out);
}
.btn--brown  { background: var(--brown); color: var(--paper); }
.btn--brown:hover  { background: var(--brown-deep); }
.btn--gold   { background: var(--gold); color: var(--brown); }
.btn--gold:hover   { transform: translateY(-1px); }
.btn--ghost  { background: transparent; color: var(--gold); border-color: var(--gold-line); }
.btn--ghost:hover  { border-color: var(--gold); }
.btn--ghost-dark { background: transparent; color: var(--brown); border-color: var(--hair-on-paper); }
.btn--ghost-dark:hover { border-color: var(--bronze); }

.tag {
  display: inline-flex; align-items: center;
  font-family: var(--font-display);
  font-size: 10px; letter-spacing: var(--track-label); text-transform: uppercase;
  padding: 7px 16px; border-radius: var(--r-pill);
  border: 1px solid var(--gold-line); color: var(--gold);
}

/* 7. HERO ------------------------------------------------------------------ */
.hero { margin-top: 22px; }
.hero__panel {
  border-radius: var(--r-lg); overflow: hidden; position: relative;
  min-height: clamp(520px, 82vh, 720px);
  display: flex; flex-direction: column; justify-content: center; align-items: center;
  text-align: center; padding: 60px var(--gutter);
  background: var(--brown-panel);
}
.hero__media { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; object-position: center 30%; opacity: 0.7; }
.hero__panel::after {
  content: ""; position: absolute; inset: 0;
  background: radial-gradient(120% 90% at 50% 42%, rgba(30,20,13,0.18), rgba(30,20,13,0.74));
}
/* ~4% film grain to knit dark surfaces into one family */
.grain::before {
  content: ""; position: absolute; inset: 0; z-index: 1; pointer-events: none;
  opacity: 0.04; mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}
.hero__inner { position: relative; z-index: 2; color: var(--paper); max-width: 800px; }
.hero__eyebrow { color: var(--gold); opacity: 0.92; margin-bottom: 26px; }
.hero h1 {
  font-family: var(--font-head); font-weight: 700; letter-spacing: -0.02em;
  font-size: var(--t-hero); line-height: 1.06; color: var(--paper);
}
.hero__sub { margin: 24px auto 0; max-width: 560px; font-size: var(--t-17); color: var(--ink-on-brown); }
.hero__cta { margin-top: 36px; }

/* 8. CARDS + BENTO --------------------------------------------------------- */
.bento {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  grid-auto-rows: minmax(230px, auto);
  gap: 14px;
}
.card {
  border-radius: var(--r-md); padding: 30px;
  display: flex; flex-direction: column; justify-content: space-between;
  position: relative; overflow: hidden;
}
.card__idx { font-family: var(--font-display); font-size: 11px; letter-spacing: 0.2em; opacity: 0.75; }
.card h3 { font-family: var(--font-head); font-weight: 700; font-size: 21px; letter-spacing: -0.01em; margin-top: 10px; }
.card p { font-size: 13.5px; line-height: 1.6; margin-top: 12px; max-width: 42ch; }
.card__floor { font-family: var(--font-display); font-size: 10px; letter-spacing: 0.22em; text-transform: uppercase; margin-top: 18px; }
.card > * { position: relative; z-index: 2; }
/* media sits behind content — declared after the lift rule so absolute wins */
.card picture, .card .card__media {
  position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; z-index: 1;
}

/* Bento variants (locked pillar priority: Strength / Recovery / Nutrition / Diagnostics) */
.card--strength {
  grid-row: span 2; background: var(--brown-panel); color: var(--paper);
  justify-content: flex-end; min-height: 474px;
}
.card--strength .card__media { opacity: 0.5; }
.card--strength .card__idx, .card--strength .card__floor { color: var(--gold); }
.card--strength p { color: var(--ink-on-brown); }

.card--recovery { background: var(--brown); color: var(--paper); }
.card--recovery .card__media { opacity: 0.42; object-position: center; }
.card--recovery .card__idx, .card--recovery .card__floor { color: var(--gold); }
.card--recovery p { color: var(--ink-on-brown); }

.card--nutrition { background: #fff; border: 1px solid var(--hair-on-paper); color: var(--brown); }
.card--nutrition .card__media { opacity: 0.16; }
.card--nutrition .card__idx, .card--nutrition .card__floor { color: var(--bronze); }
.card--nutrition p { color: var(--ink-on-paper-dim); }

/* The single sanctioned large gold fill (the diagnostics bento card) */
.card--diag {
  background: var(--gold); color: var(--brown);
  grid-column: span 2; flex-direction: row; align-items: flex-end;
  justify-content: space-between; min-height: 200px;
}
.card--diag .card__idx, .card--diag .card__floor { color: rgba(61, 43, 32, 0.6); }
.card--diag .spec {
  font-family: var(--font-display); font-size: 10px; letter-spacing: 0.12em;
  text-align: right; line-height: 1.9; color: rgba(61, 43, 32, 0.55);
}

/* 9. LEDGER (floor table) -------------------------------------------------- */
.ledger { width: 100%; border-collapse: collapse; }
.ledger caption { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
.ledger tr { border-top: 1px solid var(--gold-line); }
.ledger tr:last-child { border-bottom: 1px solid var(--gold-line); }
.ledger td { padding: 22px 12px; vertical-align: baseline; }
.ledger__floor {
  font-family: var(--font-display); font-variant-numeric: tabular-nums;
  font-size: clamp(20px, 3vw, 30px); letter-spacing: 0.04em; color: var(--gold);
  white-space: nowrap; width: 1%;
}
.ledger__code {
  font-family: var(--font-display); font-size: 11px; letter-spacing: var(--track-label);
  text-transform: uppercase; color: var(--ink-on-brown); white-space: nowrap;
}
.ledger__operator {
  font-family: var(--font-display); font-size: 11px; letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--ink-on-brown-dim); white-space: nowrap;
}
.ledger__desc { font-size: 14px; color: var(--ink-on-brown-dim); }
.ledger--dash .ledger__floor { color: var(--bronze); letter-spacing: 0.02em; }

/* 10. FORMS ---------------------------------------------------------------- */
.form { display: grid; gap: var(--sp-3); }
.form-row { display: grid; gap: var(--sp-1); }
.form-label {
  font-family: var(--font-display); font-size: 10px; letter-spacing: 0.24em;
  text-transform: uppercase; color: var(--bronze);
}
.form-input, .form-select {
  width: 100%; font-family: var(--font-body); font-size: var(--t-17);
  color: var(--brown); background: rgba(255, 255, 255, 0.6);
  border: 1px solid var(--hair-on-paper); border-radius: var(--r-input);
  padding: 14px 16px; outline: none;
  transition: border-color var(--micro) var(--ease-out), background var(--micro) var(--ease-out);
}
.form-input::placeholder { color: rgba(61, 43, 32, 0.4); }
.form-input:focus, .form-select:focus { border-color: var(--bronze); background: #fff; }
.form-select { appearance: none; -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8'%3E%3Cpath d='M1 1l5 5 5-5' fill='none' stroke='%23C8AA6E' stroke-width='1.5'/%3E%3C/svg%3E");
  background-repeat: no-repeat !important; background-position: right 16px center !important;
  background-size: 12px 8px !important; padding-right: 40px;
}
.form-row--two { grid-template-columns: 1fr 1fr; }
.form-error { font-size: var(--t-12); color: #b3592f; min-height: 1em; display: none; }
.form-error.is-shown { display: block; }
.form-submit { justify-self: start; margin-top: var(--sp-1); }
.form-confirm {
  display: none; font-size: var(--t-17); line-height: 1.6;
  padding: var(--sp-3) 0;
}
.form-confirm.is-shown { display: block; }
/* Honeypot — visually + AT hidden, still submittable by bots */
.hp-field { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }

/* Form on dark surfaces (index gate, home section 8) */
.form--on-brown .form-label { color: var(--gold); opacity: 0.7; }
.form--on-brown .form-input, .form--on-brown .form-select {
  color: var(--paper); background-color: rgba(251, 244, 224, 0.06);
  border-color: var(--gold-line-soft);
}
.form--on-brown .form-input::placeholder { color: rgba(251, 244, 224, 0.4); }
.form--on-brown .form-input:focus, .form--on-brown .form-select:focus {
  border-color: var(--gold); background: rgba(251, 244, 224, 0.1);
}
.form--on-brown .form-confirm { color: var(--ink-on-brown); }
.form--on-brown .form-select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8'%3E%3Cpath d='M1 1l5 5 5-5' fill='none' stroke='%23F6E0A3' stroke-width='1.5'/%3E%3C/svg%3E");
}

/* 11. FOOTER --------------------------------------------------------------- */
/* Kept IDENTICAL between pages. */
.foot {
  background: var(--brown); color: var(--paper);
  border-radius: var(--r-lg) var(--r-lg) 0 0;
  margin-top: 20px; padding: var(--sp-7) var(--gutter) var(--sp-5);
  position: relative;
}
.foot__grid {
  max-width: 1000px; margin: 0 auto;
  display: grid; grid-template-columns: 1.2fr 1fr 1fr; gap: 48px;
}
.foot__brand { font-family: var(--font-display); font-size: 22px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--paper); margin-bottom: var(--sp-2); }
.foot__tagline { font-size: 13px; color: var(--ink-on-brown-dim); max-width: 28ch; }
.foot-col h5 {
  font-family: var(--font-display);
  font-size: 9px; letter-spacing: 0.3em; text-transform: uppercase;
  color: var(--gold); opacity: 0.7; margin-bottom: 14px;
}
.foot-col a, .foot-col p { display: block; color: var(--ink-on-brown-dim); text-decoration: none; font-size: 13px; margin-bottom: 9px; line-height: 1.5; }
.foot-col a { transition: color var(--micro) var(--ease-out); }
.foot-col a:hover { color: var(--gold); }
.foot-col .handle { color: var(--ink-on-brown-dim); }
.foot__ledger { margin-top: var(--sp-5); max-width: 1000px; margin-inline: auto; }
.foot__ledger .ledger td { padding: 14px 12px; }
.foot__base {
  max-width: 1000px; margin: var(--sp-5) auto 0;
  border-top: 1px solid var(--gold-line-soft); padding-top: var(--sp-3);
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px;
}
.foot__legal, .foot__colophon {
  font-family: var(--font-display);
  font-size: 10px; letter-spacing: 0.12em; text-transform: uppercase;
  color: rgba(251, 244, 224, 0.34);
}

/* 12. PLACEHOLDER (awaiting photography) ----------------------------------- */
.placeholder {
  position: relative; background: var(--brown-panel); color: var(--paper);
  border-radius: var(--r-lg); overflow: hidden;
  min-height: clamp(280px, 42vw, 460px);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  text-align: center; padding: 48px var(--gutter);
}
.placeholder__frame {
  position: absolute; inset: 20px; border: 1px solid var(--gold-line);
  border-radius: calc(var(--r-lg) - 12px); pointer-events: none;
}
.placeholder__mark { width: 46px; opacity: 0.5; margin-bottom: 24px; }
.placeholder__spec {
  font-family: var(--font-display); font-size: 11px; letter-spacing: 0.24em;
  text-transform: uppercase; color: var(--gold); opacity: 0.8; line-height: 2;
  max-width: 42ch; position: relative; z-index: 2;
}

/* 13. MOTION --------------------------------------------------------------- */
/* Entrance: hairline draws in (scaleX 0->1), then content fades up 8px. */
.reveal { opacity: 0; transform: translateY(8px); }
.reveal.is-in { opacity: 1; transform: translateY(0); transition: opacity var(--entrance) var(--ease-out), transform var(--entrance) var(--ease-out); }
.draw { transform: scaleX(0); }
.draw.is-in { transform: scaleX(1); transition: transform var(--entrance) var(--ease-out); }
.reveal--delay.is-in { transition-delay: 160ms; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal, .draw { opacity: 1 !important; transform: none !important; transition: none !important; }
  * { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; }
}

/* 14. RESPONSIVE ----------------------------------------------------------- */
@media (max-width: 900px) {
  .nav { padding: 10px 14px 10px 22px; }
  .nav__links { gap: 20px; font-size: 10px; }
  .nav__cta.btn { padding: 11px 18px; }
  /* 4-col ledger: release nowrap so the desc column isn't pushed out of the panel */
  .ledger__code, .ledger__operator { white-space: normal; }
  .bento { grid-template-columns: 1fr; }
  .card--strength { grid-row: auto; min-height: 360px; }
  .card--diag { grid-column: auto; flex-direction: column; align-items: flex-start; gap: 20px; }
  .card--diag .spec { text-align: left; }
  .foot__grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 640px) {
  body { font-size: 16px; }
  .nav__links { display: none; }
  .nav__cta.btn { display: none; }
  .nav__toggle {
    display: inline-flex; background: var(--brown); color: var(--paper);
    border: none; border-radius: var(--r-pill); padding: 11px 18px;
    font-family: var(--font-display); font-size: 10px; letter-spacing: 0.2em;
    text-transform: uppercase; cursor: pointer;
  }
  .nav.is-open {
    flex-wrap: wrap; border-radius: var(--r-md); row-gap: 18px;
    padding: 16px 22px;
  }
  .nav.is-open .nav__links {
    display: flex; flex-direction: column; gap: 16px; width: 100%;
    order: 3; padding-top: 16px; border-top: 1px solid var(--hair-on-paper);
    font-size: 12px;
  }
  /* lead capture stays reachable from the open menu */
  .nav.is-open .nav__cta.btn {
    display: inline-block; order: 4; width: 100%; text-align: center;
  }
  .form-row--two { grid-template-columns: 1fr; }
  .foot { padding: var(--sp-6) var(--gutter) var(--sp-4); }
  .foot__grid { grid-template-columns: 1fr; gap: 32px; }
  .foot__base { flex-direction: column; }
  /* Ledger — tables can't shrink below their nowrap columns, so stack each row:
     floor plate left, code/operator/desc as a block on the right */
  .ledger, .ledger tbody { display: block; }
  .ledger tr {
    display: grid; grid-template-columns: minmax(48px, max-content) 1fr;
    column-gap: 18px; row-gap: 3px; align-items: start;
    padding: 16px 0;
  }
  .ledger td, .foot__ledger .ledger td { padding: 0; }
  .ledger__floor { grid-row: 1 / span 3; width: auto; }
  .ledger__code, .ledger__operator { white-space: normal; }
  .ledger__desc { font-size: 13px; }
  .hero__panel { min-height: 70vh; }
}

/* 15. UTILITIES ------------------------------------------------------------ */
.u-vh { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }
.u-center { text-align: center; }
.u-mt-3 { margin-top: var(--sp-3); }
.u-mt-5 { margin-top: var(--sp-5); }
.u-max-narrow { max-width: 640px; }
.u-offset-left { margin-left: 0; max-width: 720px; } /* asymmetry by default */