/* ==========================================================================
   Sara Connolly / Backbone Operations
   Design system: "Steel & Rust"
   Type: Fraunces (display) / Inter (body) / JetBrains Mono (data + labels)
   ========================================================================== */

:root {
  /* Steel */
  --steel-black:  #0F1418;
  --steel-plate:  #1A2126;
  --steel-line:   #2C363D;
  --steel-gray:   #5A6169;
  --steel-mid:    #8E959B;

  /* Galvanized field */
  --field:        #DDE0DE;
  --field-deep:   #CDD1CF;
  --panel:        #F4F5F4;

  /* Rust / oxide: used only for proof numbers + one interaction state */
  --rust:         #A83E1B;
  --rust-deep:    #7A2E14;
  --rust-light:   #C8632F;

  /* Type scale */
  --t-hero:   clamp(2.75rem, 7vw, 5.5rem);
  --t-h1:     clamp(2.25rem, 5vw, 3.75rem);
  --t-h2:     clamp(1.75rem, 3.4vw, 2.75rem);
  --t-h3:     clamp(1.15rem, 2vw, 1.5rem);
  --t-body:   clamp(1rem, 1.15vw, 1.125rem);
  --t-small:  0.875rem;
  --t-micro:  0.75rem;

  --gut: clamp(1.25rem, 5vw, 5rem);
  --max: 1240px;
}

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

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

body {
  margin: 0;
  background: var(--field);
  color: var(--steel-black);
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  font-size: var(--t-body);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: 'Fraunces', Georgia, serif;
  font-variation-settings: 'SOFT' 0, 'WONK' 0, 'opsz' 40;
  font-weight: 600;
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin: 0;
}

p { margin: 0 0 1.15em; }
p:last-child { margin-bottom: 0; }

a { color: inherit; }

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

/* --------------------------------------------------------------- utilities */

.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding-left: var(--gut);
  padding-right: var(--gut);
}

.wrap-narrow {
  max-width: 780px;
  margin: 0 auto;
  padding-left: var(--gut);
  padding-right: var(--gut);
}

.eyebrow {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: var(--t-micro);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--rust);
  margin: 0 0 1.25rem;
  display: block;
}

.eyebrow-light { color: var(--rust-light); }

.lede {
  font-size: clamp(1.15rem, 1.9vw, 1.4rem);
  line-height: 1.55;
  color: var(--steel-gray);
}

.rule {
  height: 1px;
  background: var(--steel-line);
  opacity: 0.28;
  border: 0;
  margin: 0;
}

/* ------------------------------------------------------------------ header */

.masthead {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--steel-black);
  border-bottom: 1px solid var(--steel-line);
}

.masthead-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  min-height: 68px;
}

.wordmark {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  text-decoration: none;
  color: var(--panel);
}

.wordmark strong {
  font-family: 'Fraunces', Georgia, serif;
  font-variation-settings: 'SOFT' 0, 'WONK' 0, 'opsz' 20;
  font-weight: 600;
  font-size: 1.15rem;
  letter-spacing: -0.01em;
}

.wordmark span {
  font-family: 'JetBrains Mono', monospace;
  font-size: var(--t-micro);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--steel-mid);
}

.nav {
  display: flex;
  align-items: center;
  gap: clamp(1rem, 2.2vw, 2rem);
}

.nav a {
  font-family: 'JetBrains Mono', monospace;
  font-size: var(--t-micro);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--steel-mid);
  text-decoration: none;
  padding: 0.4rem 0;
  border-bottom: 1px solid transparent;
  transition: color 0.18s ease, border-color 0.18s ease;
}

.nav a:hover,
.nav a:focus-visible { color: var(--panel); border-bottom-color: var(--rust); }

.nav a[aria-current="page"] { color: var(--panel); border-bottom-color: var(--rust); }

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--steel-line);
  color: var(--panel);
  font-family: 'JetBrains Mono', monospace;
  font-size: var(--t-micro);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.5rem 0.85rem;
  cursor: pointer;
}

/* --------------------------------------------------------------- buttons */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: var(--t-small);
  letter-spacing: 0.06em;
  text-decoration: none;
  padding: 0.95rem 1.6rem;
  border: 1px solid var(--steel-black);
  background: var(--steel-black);
  color: var(--panel);
  cursor: pointer;
  transition: background 0.18s ease, border-color 0.18s ease, color 0.18s ease;
}

.btn:hover, .btn:focus-visible {
  background: var(--rust);
  border-color: var(--rust);
  color: #fff;
}

.btn-ghost {
  background: transparent;
  color: var(--steel-black);
  border-color: var(--steel-black);
}

.btn-ghost:hover, .btn-ghost:focus-visible {
  background: var(--steel-black);
  border-color: var(--steel-black);
  color: var(--panel);
}

.btn-on-dark {
  background: var(--panel);
  border-color: var(--panel);
  color: var(--steel-black);
}

.btn-on-dark:hover, .btn-on-dark:focus-visible {
  background: var(--rust);
  border-color: var(--rust);
  color: #fff;
}

.btn-row { display: flex; flex-wrap: wrap; gap: 0.85rem; }

/* ---------------------------------------------------------------- section */

.band { padding: clamp(3.5rem, 8vw, 7rem) 0; }
.band-tight { padding: clamp(2.5rem, 5vw, 4rem) 0; }

.band-dark {
  background: var(--steel-black);
  color: var(--field);
}

.band-dark h1, .band-dark h2, .band-dark h3 { color: var(--panel); }
.band-dark .lede { color: var(--steel-mid); }

.band-panel { background: var(--panel); }

/* ------------------------------------------------------------------- hero */

.hero {
  background: var(--steel-black);
  color: var(--panel);
  padding: clamp(4rem, 11vw, 8.5rem) 0 clamp(3rem, 6vw, 5rem);
  position: relative;
  overflow: hidden;
}

/* Faint machined-plate grid: the steel */
.hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--steel-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--steel-line) 1px, transparent 1px);
  background-size: 88px 88px;
  opacity: 0.35;
  pointer-events: none;
  mask-image: radial-gradient(ellipse 90% 70% at 70% 30%, #000 20%, transparent 78%);
  -webkit-mask-image: radial-gradient(ellipse 90% 70% at 70% 30%, #000 20%, transparent 78%);
}

.hero .wrap { position: relative; z-index: 1; }

.hero h1 {
  font-size: var(--t-hero);
  max-width: 16ch;
  color: var(--panel);
}

.hero h1 em {
  font-style: normal;
  color: var(--rust-light);
}

.hero p {
  max-width: 58ch;
  margin-top: 1.75rem;
  font-size: clamp(1.05rem, 1.6vw, 1.3rem);
  line-height: 1.6;
  color: var(--steel-mid);
}

.hero .btn-row { margin-top: 2.5rem; }

/* --------------------------------------------------------------- proof bar */

.proofbar {
  background: var(--steel-plate);
  border-top: 1px solid var(--steel-line);
  padding: clamp(2rem, 4vw, 3rem) 0;
}

.proofbar-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: clamp(1.75rem, 3vw, 3rem);
}

.stat { padding-right: 1rem; }

.stat dt {
  font-family: 'Fraunces', Georgia, serif;
  font-variation-settings: 'SOFT' 0, 'WONK' 0, 'opsz' 40;
  font-weight: 600;
  font-size: clamp(1.9rem, 3.6vw, 2.9rem);
  line-height: 1;
  color: var(--rust-light);
  letter-spacing: -0.02em;
}

.stat dd {
  margin: 0.7rem 0 0;
  font-size: var(--t-small);
  line-height: 1.45;
  color: var(--steel-mid);
  max-width: 26ch;
}

.stat-dark dt { color: var(--rust); }
.stat-dark dd { color: var(--steel-gray); }

/* ------------------------------------------------------------------ layout */

.split {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  gap: clamp(2rem, 6vw, 5rem);
  align-items: start;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: clamp(1.5rem, 3vw, 2.5rem);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: clamp(1.5rem, 3vw, 2.25rem);
}

.section-head { margin-bottom: clamp(2rem, 4vw, 3.25rem); }
.section-head h2 { font-size: var(--t-h2); max-width: 20ch; }
.section-head p { margin-top: 1.25rem; max-width: 60ch; }

/* ------------------------------------------------------------------- cards */

.card {
  background: var(--panel);
  border: 1px solid var(--field-deep);
  padding: clamp(1.5rem, 2.6vw, 2.25rem);
  display: flex;
  flex-direction: column;
}

.card h3 { font-size: var(--t-h3); margin-bottom: 0.9rem; }

.card-dark {
  background: var(--steel-plate);
  border-color: var(--steel-line);
  color: var(--steel-mid);
}

.card-dark h3 { color: var(--panel); }

/* --------------------------------------------------------------- case study */

.case {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.7fr);
  gap: clamp(1.5rem, 4vw, 3.5rem);
  padding: clamp(2rem, 4vw, 3rem) 0;
  border-top: 1px solid var(--field-deep);
  align-items: start;
}

.case:last-of-type { border-bottom: 1px solid var(--field-deep); }

.case-meta { font-family: 'JetBrains Mono', monospace; font-size: var(--t-micro); }

.case-client {
  display: block;
  font-size: 0.95rem;
  letter-spacing: 0.02em;
  color: var(--steel-black);
  margin-bottom: 0.5rem;
  text-transform: none;
}

.case-tag {
  display: block;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--steel-gray);
  line-height: 1.7;
}

.case-body h3 { font-size: var(--t-h3); margin-bottom: 1rem; }

.case-result {
  margin-top: 1.5rem;
  padding-top: 1.25rem;
  border-top: 2px solid var(--rust);
  font-family: 'JetBrains Mono', monospace;
  font-size: var(--t-small);
  line-height: 1.7;
  color: var(--steel-black);
}

.case-result strong { color: var(--rust); font-weight: 600; }

/* ------------------------------------------------------------------ pillars */

.pillar-list { list-style: none; margin: 0; padding: 0; }

.pillar-row {
  display: grid;
  grid-template-columns: 3.25rem minmax(0, 1fr);
  gap: 1.25rem;
  padding: 1.4rem 0;
  border-top: 1px solid var(--field-deep);
  align-items: baseline;
}

.pillar-row:last-child { border-bottom: 1px solid var(--field-deep); }

.pillar-num {
  font-family: 'JetBrains Mono', monospace;
  font-size: var(--t-micro);
  letter-spacing: 0.1em;
  color: var(--rust);
}

.pillar-row h3 { font-size: 1.2rem; margin-bottom: 0.4rem; }
.pillar-row p { font-size: 0.98rem; color: var(--steel-gray); margin: 0; }

/* -------------------------------------------------------------- tier cards */

.tier {
  background: var(--panel);
  border: 1px solid var(--field-deep);
  padding: clamp(1.75rem, 3vw, 2.5rem);
  display: flex;
  flex-direction: column;
}

.tier-feature { border: 2px solid var(--rust); }

.tier-name {
  font-family: 'JetBrains Mono', monospace;
  font-size: var(--t-micro);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--rust);
  margin-bottom: 1rem;
}

.tier h3 { font-size: var(--t-h3); margin-bottom: 0.75rem; }

.tier-price {
  font-family: 'JetBrains Mono', monospace;
  font-size: 1.3rem;
  color: var(--steel-black);
  margin: 1.25rem 0 0.35rem;
}

.tier-terms {
  font-family: 'JetBrains Mono', monospace;
  font-size: var(--t-micro);
  letter-spacing: 0.06em;
  color: var(--steel-gray);
  text-transform: uppercase;
}

.tier ul {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  flex: 1;
}

.tier li {
  position: relative;
  padding-left: 1.4rem;
  margin-bottom: 0.7rem;
  font-size: 0.96rem;
  line-height: 1.5;
  color: var(--steel-gray);
}

.tier li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 8px;
  height: 1px;
  background: var(--rust);
}

.tier-fit {
  margin-top: 1.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--field-deep);
  font-size: 0.95rem;
  color: var(--steel-gray);
}

.tier-fit strong { color: var(--steel-black); font-weight: 600; }

/* ---------------------------------------------------------------- process */

.step {
  border-top: 2px solid var(--steel-black);
  padding-top: 1.25rem;
}

.step-num {
  font-family: 'JetBrains Mono', monospace;
  font-size: var(--t-micro);
  letter-spacing: 0.14em;
  color: var(--rust);
  display: block;
  margin-bottom: 0.9rem;
}

.step h3 { font-size: 1.15rem; margin-bottom: 0.6rem; }
.step p { font-size: 0.96rem; color: var(--steel-gray); margin: 0; }

/* --------------------------------------------------------------------- faq */

.faq { border-top: 1px solid var(--field-deep); }

.faq summary {
  cursor: pointer;
  padding: 1.4rem 2.5rem 1.4rem 0;
  font-family: 'Fraunces', Georgia, serif;
  font-variation-settings: 'SOFT' 0, 'WONK' 0, 'opsz' 20;
  font-weight: 600;
  font-size: 1.1rem;
  line-height: 1.35;
  list-style: none;
  position: relative;
}

.faq summary::-webkit-details-marker { display: none; }

.faq summary::after {
  content: '+';
  position: absolute;
  right: 0;
  top: 1.25rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: 1.3rem;
  color: var(--rust);
  transition: transform 0.2s ease;
}

.faq[open] summary::after { transform: rotate(45deg); }

.faq summary:hover { color: var(--rust); }

.faq-body {
  padding: 0 2.5rem 1.6rem 0;
  color: var(--steel-gray);
  font-size: 0.99rem;
}

/* ============================================================== ASSESSMENT
   Signature element: the backbone. Seven vertebrae, one per pillar.
   ========================================================================= */

.assess-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
  gap: clamp(2rem, 5vw, 4rem);
  align-items: start;
}

.assess-panel {
  background: var(--panel);
  border: 1px solid var(--field-deep);
  padding: clamp(1.5rem, 3vw, 2.5rem);
}

.q-block { border-top: 1px solid var(--field-deep); padding: 1.75rem 0; }
.q-block:first-of-type { border-top: 0; padding-top: 0; }

.q-pillar {
  font-family: 'JetBrains Mono', monospace;
  font-size: var(--t-micro);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--rust);
  display: block;
  margin-bottom: 0.6rem;
}

.q-text {
  font-family: 'Fraunces', Georgia, serif;
  font-variation-settings: 'SOFT' 0, 'WONK' 0, 'opsz' 20;
  font-weight: 600;
  font-size: 1.12rem;
  line-height: 1.35;
  margin-bottom: 1.1rem;
}

.scale {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0.4rem;
}

.scale button {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.95rem;
  padding: 0.85rem 0.25rem;
  background: transparent;
  border: 1px solid var(--field-deep);
  color: var(--steel-gray);
  cursor: pointer;
  transition: all 0.15s ease;
}

.scale button:hover { border-color: var(--rust); color: var(--rust); }

.scale button[aria-pressed="true"] {
  background: var(--steel-black);
  border-color: var(--steel-black);
  color: var(--panel);
}

.scale-legend {
  display: flex;
  justify-content: space-between;
  font-family: 'JetBrains Mono', monospace;
  font-size: var(--t-micro);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--steel-gray);
  margin-top: 0.6rem;
}

/* the spine */
.spine-panel {
  position: sticky;
  top: 92px;
  background: var(--steel-black);
  border: 1px solid var(--steel-line);
  padding: clamp(1.5rem, 3vw, 2.25rem);
  color: var(--steel-mid);
}

.spine-panel h3 { color: var(--panel); font-size: 1.25rem; margin-bottom: 0.4rem; }

.spine-sub {
  font-family: 'JetBrains Mono', monospace;
  font-size: var(--t-micro);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--steel-gray);
  margin-bottom: 1.75rem;
}

.vertebra { margin-bottom: 1rem; }

.vertebra-label {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-family: 'JetBrains Mono', monospace;
  font-size: var(--t-micro);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--steel-mid);
  margin-bottom: 0.4rem;
}

.vertebra-score { color: var(--steel-gray); }

.vertebra-track {
  height: 10px;
  background: var(--steel-plate);
  border: 1px solid var(--steel-line);
  position: relative;
  overflow: hidden;
}

.vertebra-fill {
  position: absolute;
  inset: 0 auto 0 0;
  width: 0;
  background: var(--steel-mid);
  transition: width 0.5s cubic-bezier(0.22, 1, 0.36, 1), background 0.3s ease;
}

.vertebra-fill.weak { background: var(--rust); }
.vertebra-fill.mid  { background: var(--rust-light); }

.spine-total {
  margin-top: 1.75rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--steel-line);
}

.spine-total dt {
  font-family: 'Fraunces', Georgia, serif;
  font-variation-settings: 'SOFT' 0, 'WONK' 0, 'opsz' 40;
  font-weight: 600;
  font-size: 2.6rem;
  line-height: 1;
  color: var(--panel);
}

.spine-total dd {
  margin: 0.6rem 0 0;
  font-size: 0.92rem;
  line-height: 1.5;
  color: var(--steel-mid);
}

.spine-verdict {
  margin-top: 1.25rem;
  padding: 1rem;
  background: var(--steel-plate);
  border-left: 2px solid var(--rust);
  font-size: 0.92rem;
  line-height: 1.55;
  color: var(--steel-mid);
}

.assess-actions { margin-top: 1.75rem; display: none; }
.assess-actions.visible { display: block; }
.assess-actions .btn { width: 100%; justify-content: center; }

/* ------------------------------------------------------------------- forms */

.field { margin-bottom: 1.4rem; }

.field label {
  display: block;
  font-family: 'JetBrains Mono', monospace;
  font-size: var(--t-micro);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--steel-gray);
  margin-bottom: 0.55rem;
}

.field input,
.field select,
.field textarea {
  width: 100%;
  padding: 0.85rem 1rem;
  font-family: 'Inter', sans-serif;
  font-size: 1rem;
  color: var(--steel-black);
  background: #fff;
  border: 1px solid var(--field-deep);
  border-radius: 0;
}

.field input:focus,
.field select:focus,
.field textarea:focus {
  outline: 2px solid var(--rust);
  outline-offset: -1px;
  border-color: var(--rust);
}

.field textarea { min-height: 150px; resize: vertical; }

/* ------------------------------------------------------------------ footer */

.footer {
  background: var(--steel-black);
  color: var(--steel-mid);
  padding: clamp(3rem, 6vw, 5rem) 0 2rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) repeat(auto-fit, minmax(140px, 1fr));
  gap: clamp(2rem, 4vw, 3.5rem);
  padding-bottom: 3rem;
}

.footer h4 {
  font-family: 'JetBrains Mono', monospace;
  font-size: var(--t-micro);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--steel-gray);
  font-weight: 400;
  margin-bottom: 1.1rem;
}

.footer ul { list-style: none; margin: 0; padding: 0; }
.footer li { margin-bottom: 0.65rem; }

.footer a {
  color: var(--steel-mid);
  text-decoration: none;
  font-size: 0.94rem;
  transition: color 0.18s ease;
}

.footer a:hover, .footer a:focus-visible { color: var(--rust-light); }

.footer-brand p {
  font-size: 0.94rem;
  max-width: 34ch;
  color: var(--steel-gray);
  margin-top: 1rem;
}

.footer-base {
  border-top: 1px solid var(--steel-line);
  padding-top: 1.75rem;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: space-between;
  font-family: 'JetBrains Mono', monospace;
  font-size: var(--t-micro);
  letter-spacing: 0.06em;
  color: var(--steel-gray);
}

/* ---------------------------------------------------------------- CTA band */

.cta-band { background: var(--rust); color: #fff; padding: clamp(3rem, 6vw, 5rem) 0; }
.cta-band h2 { color: #fff; font-size: var(--t-h2); max-width: 18ch; }
.cta-band p { color: rgba(255,255,255,0.82); max-width: 52ch; margin-top: 1.25rem; }
.cta-band .btn-row { margin-top: 2rem; }

.cta-band .btn {
  background: var(--steel-black);
  border-color: var(--steel-black);
  color: #fff;
}

.cta-band .btn:hover, .cta-band .btn:focus-visible {
  background: #fff;
  border-color: #fff;
  color: var(--steel-black);
}

/* ------------------------------------------------------------- page header */

.pagehead {
  background: var(--steel-black);
  color: var(--panel);
  padding: clamp(3.5rem, 8vw, 6rem) 0 clamp(2.5rem, 5vw, 4rem);
}

.pagehead h1 { font-size: var(--t-h1); max-width: 18ch; color: var(--panel); }
.pagehead p { margin-top: 1.5rem; max-width: 58ch; color: var(--steel-mid); font-size: clamp(1.05rem, 1.5vw, 1.2rem); }

/* ------------------------------------------------------------ accessibility */

.skip {
  position: absolute;
  left: -9999px;
  background: var(--rust);
  color: #fff;
  padding: 0.85rem 1.25rem;
  z-index: 200;
  font-family: 'JetBrains Mono', monospace;
  font-size: var(--t-small);
}

.skip:focus { left: var(--gut); top: 0.5rem; }

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

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ------------------------------------------------------------------ mobile */

@media (max-width: 860px) {
  .split, .case, .assess-layout { grid-template-columns: minmax(0, 1fr); }
  .spine-panel { position: static; }
  .footer-grid { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 760px) {
  .nav-toggle { display: block; }

  .nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--steel-black);
    border-bottom: 1px solid var(--steel-line);
    padding: 0.5rem var(--gut) 1.5rem;
  }

  .nav.open { display: flex; }

  .nav a {
    padding: 0.85rem 0;
    border-bottom: 1px solid var(--steel-line);
    font-size: var(--t-small);
  }

  .masthead-inner { position: relative; }
  .scale button { padding: 0.75rem 0.15rem; font-size: 0.85rem; }
}

/* ==========================================================================
   THE CHAIN: five verticals, owned end to end. The proof of the claim.
   ========================================================================== */

.chain {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0;
  margin: clamp(2rem, 4vw, 3rem) 0 0;
  border: 1px solid var(--steel-line);
}

.chain-link {
  padding: clamp(1.1rem, 2vw, 1.6rem) clamp(0.7rem, 1.4vw, 1.25rem);
  border-right: 1px solid var(--steel-line);
  position: relative;
  background: var(--steel-plate);
}

.chain-link:last-child { border-right: 0; }

.chain-link::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--rust);
}

.chain-stage {
  font-family: 'JetBrains Mono', monospace;
  font-size: var(--t-micro);
  letter-spacing: 0.14em;
  color: var(--rust);
  display: block;
  margin-bottom: 0.7rem;
}

.chain-link h3 {
  font-size: clamp(0.95rem, 1.3vw, 1.15rem);
  color: var(--panel);
  margin-bottom: 0.5rem;
  letter-spacing: -0.01em;
}

.chain-link p {
  font-size: 0.82rem;
  line-height: 1.5;
  color: var(--steel-mid);
  margin: 0;
}

.chain-caption {
  font-family: 'JetBrains Mono', monospace;
  font-size: var(--t-micro);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--steel-gray);
  margin-top: 1.1rem;
  display: block;
}

/* light-field variant */
.chain-light { border-color: var(--field-deep); }
.chain-light .chain-link { background: var(--panel); border-right-color: var(--field-deep); }
.chain-light .chain-link h3 { color: var(--steel-black); }
.chain-light .chain-link p { color: var(--steel-gray); }

/* definition / standard block */
.standard {
  border-left: 3px solid var(--rust);
  padding: 0.25rem 0 0.25rem clamp(1.25rem, 2.5vw, 2rem);
  margin: clamp(1.5rem, 3vw, 2.25rem) 0;
}

.standard p {
  font-family: 'Fraunces', Georgia, serif;
  font-variation-settings: 'SOFT' 0, 'WONK' 0, 'opsz' 20;
  font-weight: 600;
  font-size: clamp(1.15rem, 1.9vw, 1.5rem);
  line-height: 1.4;
  letter-spacing: -0.01em;
}

.standard .standard-note {
  font-family: 'Inter', sans-serif;
  font-weight: 400;
  font-size: 0.96rem;
  line-height: 1.6;
  color: var(--steel-gray);
  margin-top: 1rem;
  letter-spacing: 0;
}

.band-dark .standard .standard-note { color: var(--steel-mid); }

@media (max-width: 860px) {
  .chain { grid-template-columns: repeat(2, 1fr); }
  .chain-link { border-bottom: 1px solid var(--steel-line); }
  .chain-light .chain-link { border-bottom-color: var(--field-deep); }
  .chain-link:nth-child(2n) { border-right: 0; }
  .chain-link:last-child { grid-column: 1 / -1; }
}

@media (max-width: 520px) {
  .chain { grid-template-columns: 1fr; }
  .chain-link { border-right: 0; }
  .chain-link:nth-child(2n) { border-right: 0; }
}

/* ==========================================================================
   FUNCTIONS: the horizontal layer running through all five verticals
   ========================================================================== */

.functions {
  margin-top: -1px;
  border: 1px solid var(--steel-line);
  border-top: 0;
  background: var(--steel-black);
  padding: clamp(1.1rem, 2vw, 1.5rem) clamp(0.9rem, 1.6vw, 1.25rem);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem clamp(0.9rem, 2vw, 1.75rem);
}

.functions-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: var(--t-micro);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--rust);
  flex: 0 0 auto;
  padding-right: clamp(0.5rem, 1.5vw, 1rem);
  border-right: 1px solid var(--steel-line);
}

.functions span.fn {
  font-family: 'Inter', sans-serif;
  font-size: 0.88rem;
  color: var(--steel-mid);
  white-space: nowrap;
}

@media (max-width: 640px) {
  .functions { flex-direction: column; align-items: flex-start; }
  .functions-label { border-right: 0; border-bottom: 1px solid var(--steel-line); padding: 0 0 0.6rem; width: 100%; }
}

/* ==========================================================================
   BRAND MARK + PORTRAITS
   ========================================================================== */

.mark {
  height: 30px;
  width: auto;
  flex: 0 0 auto;
  transform: translateY(2px);
}

.wordmark { gap: 0.75rem; }

.wordmark-text { display: flex; align-items: baseline; gap: 0.6rem; }

@media (max-width: 420px) {
  .wordmark-text span { display: none; }
  .mark { height: 26px; }
}

/* --- portrait: About page --- */

.portrait-split {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: clamp(2rem, 5vw, 4rem);
  align-items: start;
}

.portrait-frame {
  position: relative;
  background: var(--steel-black);
  padding: 10px;
}

.portrait-frame::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: var(--rust);
  z-index: 2;
}

.portrait-frame img {
  width: 100%;
  height: auto;
  display: block;
  filter: grayscale(100%) contrast(1.05);
}

.portrait-caption {
  font-family: 'JetBrains Mono', monospace;
  font-size: var(--t-micro);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--steel-gray);
  margin-top: 0.9rem;
  line-height: 1.7;
  display: block;
}

/* --- portrait: Contact page inline --- */

.contact-portrait {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  margin-bottom: 2rem;
  padding-bottom: 1.75rem;
  border-bottom: 1px solid var(--field-deep);
}

.contact-portrait img {
  width: 88px;
  height: 88px;
  object-fit: cover;
  flex: 0 0 auto;
  border-top: 3px solid var(--rust);
  filter: grayscale(100%);
}

.contact-portrait div {
  font-family: 'JetBrains Mono', monospace;
  font-size: var(--t-micro);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--steel-gray);
  line-height: 1.9;
}

.contact-portrait strong {
  display: block;
  font-family: 'Fraunces', Georgia, serif;
  font-variation-settings: 'SOFT' 0, 'WONK' 0, 'opsz' 20;
  font-size: 1.15rem;
  letter-spacing: -0.01em;
  text-transform: none;
  color: var(--steel-black);
  margin-bottom: 0.15rem;
}

/* footer mark */
.footer .mark { height: 26px; opacity: 0.85; }

@media (max-width: 860px) {
  .portrait-split { grid-template-columns: minmax(0, 1fr); }
  .portrait-frame { max-width: 420px; }
}

/* wordmark wrapper must not inherit the mono/uppercase treatment */
.wordmark .wordmark-text {
  font-family: 'Fraunces', Georgia, serif;
  text-transform: none;
  letter-spacing: normal;
  font-size: 1rem;
  color: var(--panel);
}

.wordmark .wordmark-text strong {
  font-family: 'Fraunces', Georgia, serif;
  font-variation-settings: 'SOFT' 0, 'WONK' 0, 'opsz' 20;
  font-weight: 600;
  font-size: 1.15rem;
  letter-spacing: -0.01em;
  text-transform: none;
  color: var(--panel);
}

.wordmark .wordmark-text span {
  font-family: 'JetBrains Mono', monospace;
  font-size: var(--t-micro);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--steel-mid);
}