/* Millwright AI Advisory
   Brand tokens: gunmetal #2A3439, brass #B5985A, steel white #E9ECEB.
   Only tints and shades of those three colors appear below.
   Light and dark themes share the brass accent and the gunmetal header, hero,
   contact, and footer bands; the content bands swap between steel and gunmetal shades. */

:root {
  color-scheme: light;

  --gunmetal: #2A3439;
  --gunmetal-deep: #1E262A;
  --brass: #B5985A;
  --brass-tint: #C9AF76;
  --brass-shade: #957B45;
  --steel: #E9ECEB;

  /* Content band surfaces and text */
  --bg: #E9ECEB;
  --bg-alt: #D8DDDB;
  --fg: #2A3439;
  --fg-2: #4D5A61;
  --fg-3: #6B777E;
  --rule: rgba(42, 52, 57, 0.16);
  --rule-soft: rgba(42, 52, 57, 0.1);

  /* Header and hero. Light in the light theme, gunmetal in the dark theme. */
  --top-bg: #E9ECEB;
  --top-fg: #2A3439;
  --top-fg-2: #4D5A61;
  --top-rule: rgba(42, 52, 57, 0.18);
  --top-mark: 0.07;
  --hero-bg: #D8DDDB;

  /* Bands that stay gunmetal in both themes (contact, closing band, footer) */
  --dark: #2A3439;
  --dark-deep: #1E262A;
  --on-dark: #E9ECEB;
  --on-dark-2: rgba(233, 236, 235, 0.72);
  --on-dark-3: rgba(233, 236, 235, 0.5);
  --on-dark-rule: rgba(233, 236, 235, 0.14);

  --font: "Helvetica Neue", Helvetica, Arial, sans-serif;
  --measure: 62ch;
  --gutter: clamp(20px, 5vw, 64px);
  --band: clamp(52px, 6.5vw, 88px);

  /* One full turn of the hero millwheel. Larger is slower. */
  --spin: 45s;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #1F272B;
  --bg-alt: #171D20;
  --fg: #E9ECEB;
  --fg-2: rgba(233, 236, 235, 0.74);
  --fg-3: rgba(233, 236, 235, 0.52);
  --rule: rgba(233, 236, 235, 0.16);
  --rule-soft: rgba(233, 236, 235, 0.1);
  --dark-deep: #121719;
  --top-bg: #2A3439;
  --top-fg: #E9ECEB;
  --top-fg-2: rgba(233, 236, 235, 0.72);
  --top-rule: rgba(233, 236, 235, 0.14);
  --top-mark: 0.06;
  --hero-bg: #2A3439;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --bg: #1F272B;
    --bg-alt: #171D20;
    --fg: #E9ECEB;
    --fg-2: rgba(233, 236, 235, 0.74);
    --fg-3: rgba(233, 236, 235, 0.52);
    --rule: rgba(233, 236, 235, 0.16);
    --rule-soft: rgba(233, 236, 235, 0.1);
    --dark-deep: #121719;
    --top-bg: #2A3439;
    --top-fg: #E9ECEB;
    --top-fg-2: rgba(233, 236, 235, 0.72);
    --top-rule: rgba(233, 236, 235, 0.14);
    --top-mark: 0.06;
    --hero-bg: #2A3439;
  }
}

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

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

body {
  margin: 0;
  font-family: var(--font);
  font-size: 1.0625rem;
  line-height: 1.6;
  color: var(--fg);
  background: var(--bg);
  font-weight: 400;
}

a {
  color: inherit;
}

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

.wrap {
  width: min(1160px, 100% - 2 * var(--gutter));
  margin-inline: auto;
}

/* Type */

h1,
h2,
h3 {
  margin: 0;
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.05;
}

h1 {
  font-size: clamp(2.5rem, 5.6vw, 4.5rem);
  max-width: 14ch;
}

h2 {
  font-size: clamp(1.875rem, 3.4vw, 2.75rem);
  max-width: 18ch;
}

h3 {
  font-size: 1.25rem;
  letter-spacing: -0.01em;
  line-height: 1.25;
}

p {
  margin: 0;
  max-width: var(--measure);
}

.lead {
  font-size: clamp(1.125rem, 1.6vw, 1.375rem);
  line-height: 1.5;
}

.label {
  display: block;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--brass);
}

/* Logo */

.logo {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  text-decoration: none;
  color: inherit;
}

.mark {
  width: 40px;
  height: 40px;
  flex: none;
}

.wordmark {
  display: grid;
  line-height: 1;
}

.wordmark .name {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: 0.02em;
}

.wordmark .desc {
  margin-top: 4px;
  font-size: 0.5625rem;
  font-weight: 600;
  letter-spacing: 0.34em;
  color: var(--brass);
  text-transform: uppercase;
}

/* Buttons */

.btn {
  display: inline-block;
  padding: 14px 26px;
  background: var(--brass);
  color: var(--gunmetal-deep);
  font-weight: 600;
  font-size: 0.9375rem;
  letter-spacing: 0.01em;
  text-decoration: none;
  border-radius: 2px;
  border: 0;
  cursor: pointer;
  transition: background-color 120ms ease;
}

.btn:hover {
  background: var(--brass-tint);
}

.btn:active {
  background: var(--brass-shade);
}

/* Header */

.site-header {
  background: var(--top-bg);
  color: var(--top-fg);
  border-bottom: 1px solid var(--top-rule);
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 18px 20px;
  padding-block: 22px;
}

.site-header .btn {
  padding: 11px 20px;
}

.site-nav {
  margin-left: auto;
}

.site-nav ul,
.footer-nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 24px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-nav a,
.footer-nav a {
  display: inline-block;
  padding-block: 6px;
  font-weight: 600;
  font-size: 0.9375rem;
  text-decoration: none;
  border-bottom: 2px solid transparent;
}

.site-nav a {
  color: var(--top-fg-2);
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--top-fg);
}

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

.footer-nav a {
  color: var(--on-dark-2);
}

.footer-nav a:hover {
  color: var(--on-dark);
}

/* Theme toggle. Hidden until the script runs, since without it the button does nothing. */

.theme-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  padding: 0;
  border: 1.5px solid var(--top-rule);
  border-radius: 2px;
  background: transparent;
  color: var(--top-fg-2);
  cursor: pointer;
}

.theme-toggle:hover {
  color: var(--top-fg);
  border-color: var(--top-fg-2);
}

.js .theme-toggle {
  display: inline-flex;
}

.theme-toggle svg {
  width: 18px;
  height: 18px;
}

.theme-toggle .icon-sun {
  display: none;
}

:root[data-theme="dark"] .theme-toggle .icon-sun {
  display: block;
}

:root[data-theme="dark"] .theme-toggle .icon-moon {
  display: none;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-toggle .icon-sun {
    display: block;
  }

  :root:not([data-theme="light"]) .theme-toggle .icon-moon {
    display: none;
  }
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* Hero */

.hero {
  position: relative;
  overflow: hidden;
  background: var(--hero-bg);
  color: var(--top-fg);
  isolation: isolate;
}

.hero .wrap {
  position: relative;
  z-index: 1;
  padding-block: var(--band) calc(var(--band) + 8px);
  display: grid;
  gap: 24px;
}

.hero .lead {
  color: var(--top-fg-2);
}

.hero .btn {
  justify-self: start;
  margin-top: 8px;
}

.hero-mark {
  position: absolute;
  z-index: 0;
  right: -12vw;
  top: 50%;
  width: clamp(520px, 62vw, 980px);
  height: auto;
  transform: translateY(-50%);
  pointer-events: none;
}

.hero-mark .ghost {
  opacity: var(--top-mark);
}

.hero-mark .tooth {
  opacity: 0.42;
}

.hero-mark .turning {
  transform-box: view-box;
  transform-origin: 60px 60px;
  animation: turn var(--spin) linear infinite;
}

@keyframes turn {
  to {
    transform: rotate(360deg);
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .hero-mark .turning {
    animation: none;
  }
}

/* Inner page title band */

.page-head {
  background: var(--hero-bg);
  color: var(--top-fg);
}

.page-head .wrap {
  display: grid;
  gap: 18px;
  padding-block: clamp(44px, 5.5vw, 72px);
}

.page-head .lead {
  color: var(--top-fg-2);
}

/* Bands */

.band {
  padding-block: var(--band);
}

.band-head {
  display: grid;
  gap: 18px;
  margin-bottom: clamp(28px, 3.5vw, 44px);
}

.band-head .lead {
  color: var(--fg-2);
}

.on-steel {
  background: var(--bg);
  color: var(--fg);
}

.alt,
.serve {
  background: var(--bg-alt);
  color: var(--fg);
}

.on-gunmetal {
  background: var(--dark);
  color: var(--on-dark);
}

/* Links that lead to another page */

.more {
  margin-top: 8px;
}

.more a,
.copy a,
.faq a {
  display: inline;
  color: var(--fg);
  font-weight: 600;
  text-decoration: none;
  border-bottom: 2px solid var(--brass);
  padding-bottom: 1px;
}

.more a {
  display: inline-block;
}

.more a:hover,
.copy a:hover,
.faq a:hover {
  color: var(--brass-shade);
}

.pillars + .more,
.steps + .more {
  margin-top: clamp(32px, 4vw, 48px);
}

/* Pillars: brass top border items */

.pillars {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(24px, 3.5vw, 48px);
  margin: 0;
  padding: 0;
  list-style: none;
}

.pillars.pairs {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.pillars.quad {
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(20px, 3vw, 40px);
}

.pillar {
  border-top: 3px solid var(--brass);
  padding-top: 20px;
  display: grid;
  gap: 10px;
  align-content: start;
}

.pillar p {
  color: var(--fg-2);
  max-width: none;
}

.pillar .refs {
  margin-top: 4px;
  padding-top: 10px;
  border-top: 1px solid var(--rule-soft);
  font-size: 0.8125rem;
  line-height: 1.5;
  color: var(--fg-3);
}

/* Numbered steps: used only where the content is a real sequence */

.steps {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: clamp(20px, 3vw, 40px);
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: step;
}

.step {
  counter-increment: step;
  display: grid;
  gap: 10px;
  align-content: start;
  padding-top: 18px;
  border-top: 1px solid var(--rule);
}

.step::before {
  content: counter(step, decimal-leading-zero);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--brass);
}

.step p {
  color: var(--fg-2);
  max-width: none;
}

/* Two column layouts: heading left, content right */

.serve .wrap,
.why .wrap,
.service {
  display: grid;
  grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
  gap: clamp(28px, 4vw, 64px);
  align-items: start;
}

.serve .band-head,
.why .band-head {
  margin-bottom: 0;
}

.copy {
  display: grid;
  gap: 18px;
}

.copy p {
  color: var(--fg-2);
}

.copy address {
  font-style: normal;
  line-height: 1.6;
  color: var(--fg);
}

.service-head {
  display: grid;
  gap: 16px;
}

.service-head .lead {
  color: var(--fg-2);
}

/* Regulation lists */

.regs {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(32px, 5vw, 72px);
}

.reg-group {
  display: grid;
  gap: 18px;
  align-content: start;
  border-top: 3px solid var(--brass);
  padding-top: 22px;
}

.reg-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 16px;
}

.reg-list li {
  color: var(--fg-2);
  padding-left: 18px;
  position: relative;
}

.reg-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 7px;
  height: 7px;
  background: var(--brass);
}

.reg-list strong {
  color: var(--fg);
  font-weight: 600;
}

.note {
  margin-top: clamp(28px, 3.5vw, 44px);
  font-size: 0.9375rem;
  color: var(--fg-3);
  max-width: var(--measure);
}

/* Questions page */

.faq {
  display: grid;
  gap: 0;
  max-width: 76ch;
}

.faq details {
  border-top: 1px solid var(--rule);
}

.faq details:last-child {
  border-bottom: 1px solid var(--rule);
}

.faq summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 24px;
  padding: 18px 0;
  font-weight: 600;
  font-size: 1.0625rem;
  line-height: 1.4;
}

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

.faq summary::after {
  content: "+";
  flex: none;
  color: var(--brass);
  font-weight: 400;
  font-size: 1.5rem;
  line-height: 1;
}

.faq details[open] summary::after {
  content: "\2212";
}

.faq .answer {
  display: grid;
  gap: 12px;
  padding: 0 0 22px;
}

.faq .answer p {
  color: var(--fg-2);
  max-width: none;
}

/* Transparency */

.transparency {
  border-top: 1px solid var(--brass);
  border-bottom: 1px solid var(--brass);
  padding-block: clamp(28px, 3vw, 40px);
}

.transparency .wrap {
  display: grid;
  grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
  gap: clamp(24px, 4vw, 64px);
  align-items: baseline;
}

.transparency p {
  font-size: 1.125rem;
  line-height: 1.5;
}

/* Contact and closing band */

.contact .wrap,
.cta .wrap {
  display: grid;
  gap: 20px;
  padding-block: var(--band);
}

.contact .lead,
.cta .lead {
  color: var(--on-dark-2);
}

.contact .btn,
.cta .btn {
  justify-self: start;
  margin-top: 8px;
}

.contact-lines {
  display: grid;
  gap: 6px;
  margin-top: 16px;
  color: var(--on-dark-2);
  font-size: 1rem;
}

.contact-lines a {
  color: var(--on-dark);
  text-decoration: none;
  border-bottom: 1px solid var(--brass);
}

.contact-lines a:hover {
  color: var(--brass-tint);
}

/* Contact form */

.contact-grid {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
  gap: clamp(40px, 6vw, 96px);
  align-items: start;
}

.contact-intro {
  display: grid;
  gap: 20px;
}

.contact-intro .btn {
  justify-self: start;
  margin-top: 8px;
}

.contact-form {
  display: grid;
  gap: 18px;
  padding: clamp(24px, 3vw, 36px);
  border: 1px solid var(--on-dark-rule);
  border-top: 3px solid var(--brass);
  border-radius: 2px;
}

.form-title {
  font-size: 1.375rem;
  letter-spacing: -0.01em;
}

.field {
  display: grid;
  gap: 6px;
}

.field label {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--on-dark);
}

.field .opt {
  font-weight: 400;
  color: var(--on-dark-3);
}

.field input,
.field textarea {
  width: 100%;
  padding: 12px 14px;
  font: inherit;
  font-size: 1rem;
  color: var(--on-dark);
  background: rgba(233, 236, 235, 0.06);
  border: 1.5px solid var(--on-dark-rule);
  border-radius: 2px;
}

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

.field textarea {
  resize: vertical;
  min-height: 140px;
}

.trap {
  position: absolute;
  left: -10000px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.form-note {
  font-size: 0.875rem;
  color: var(--on-dark-2);
  max-width: none;
}

.form-note a {
  color: var(--on-dark);
  text-decoration: none;
  border-bottom: 1px solid var(--brass);
}

.contact-form .btn {
  justify-self: start;
}

/* Privacy page: static items in the questions layout */

.faq.static .item {
  display: grid;
  gap: 8px;
  padding: 20px 0;
  border-top: 1px solid var(--rule);
}

.faq.static .item:last-child {
  border-bottom: 1px solid var(--rule);
}

.faq.static h3 {
  font-size: 1.0625rem;
}

.faq.static p {
  color: var(--fg-2);
  max-width: none;
}

/* Articles */

.article-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  max-width: 76ch;
}

.article-item {
  display: grid;
  gap: 10px;
  padding: 26px 0;
  border-top: 1px solid var(--rule);
}

.article-item:last-child {
  border-bottom: 1px solid var(--rule);
}

.article-item time {
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--brass);
}

.article-item h2 {
  font-size: 1.5rem;
  max-width: none;
}

.article-item h2 a {
  text-decoration: none;
  color: var(--fg);
  border-bottom: 2px solid transparent;
}

.article-item h2 a:hover {
  border-bottom-color: var(--brass);
}

.article-item p {
  color: var(--fg-2);
  max-width: none;
}

.article .page-head h1 {
  max-width: 20ch;
  font-size: clamp(2.125rem, 4.4vw, 3.5rem);
}

.article .page-head .wrap {
  gap: 16px;
}

.byline {
  font-size: 0.9375rem;
  color: var(--top-fg-2);
}

.prose {
  max-width: 68ch;
  display: grid;
  gap: 18px;
}

.prose h2 {
  font-size: 1.5rem;
  max-width: none;
  margin-top: 18px;
}

.prose p {
  color: var(--fg-2);
  max-width: none;
}

.prose strong {
  color: var(--fg);
  font-weight: 600;
}

.prose a {
  color: var(--fg);
  font-weight: 600;
  text-decoration: none;
  border-bottom: 2px solid var(--brass);
}

.prose a:hover {
  color: var(--brass-shade);
}

/* Footer */

.site-footer {
  background: var(--dark-deep);
  color: var(--on-dark-2);
  font-size: 0.9375rem;
}

.site-footer .wrap {
  display: grid;
  grid-template-columns: auto 1fr auto;
  grid-template-areas:
    "logo nav address"
    "copy copy copy";
  gap: 28px 48px;
  align-items: start;
  padding-block: 40px 32px;
}

.site-footer .logo {
  grid-area: logo;
}

.site-footer .footer-nav {
  grid-area: nav;
  padding-top: 4px;
}

.site-footer address {
  grid-area: address;
  font-style: normal;
  line-height: 1.5;
  text-align: right;
}

.site-footer small {
  grid-area: copy;
  font-size: 0.875rem;
  color: var(--on-dark-3);
  border-top: 1px solid var(--on-dark-rule);
  padding-top: 20px;
}

.site-footer .wordmark .name {
  color: var(--on-dark);
}

/* 404 */

.notfound .wrap {
  display: grid;
  gap: 24px;
  padding-block: calc(var(--band) + 24px);
  min-height: 60vh;
  align-content: center;
}

.notfound .lead {
  color: var(--on-dark-2);
}

.notfound a.btn {
  justify-self: start;
}

/* Responsive */

/* Below 1240px the seven navigation links no longer fit beside the logo, the toggle,
   and the button, so the navigation takes its own row under them. */
@media (max-width: 1240px) {
  .site-header .wrap {
    padding-block: 18px 14px;
  }

  .site-nav {
    order: 3;
    flex-basis: 100%;
    margin-left: 0;
    border-top: 1px solid var(--top-rule);
    padding-top: 10px;
  }

  .site-nav ul {
    gap: 4px 22px;
  }

  .theme-toggle {
    margin-left: auto;
  }
}

@media (max-width: 1100px) {
  .pillars.quad {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 900px) {
  .pillars,
  .pillars.pairs,
  .pillars.quad {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .steps {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .serve .wrap,
  .why .wrap,
  .transparency .wrap,
  .service,
  .regs,
  .contact-grid {
    grid-template-columns: 1fr;
  }

  .site-footer .wrap {
    grid-template-columns: 1fr;
    grid-template-areas:
      "logo"
      "nav"
      "address"
      "copy";
    gap: 24px;
  }

  .site-footer address {
    text-align: left;
  }

  .hero-mark {
    right: -40vw;
    width: 150vw;
  }

  .hero-mark .tooth {
    opacity: 0.3;
  }
}

@media (max-width: 520px) {
  .site-header .wrap {
    padding-block: 16px 12px;
    gap: 14px 16px;
  }

  .site-header .btn {
    padding: 10px 16px;
    font-size: 0.875rem;
    margin-left: auto;
  }

  /* Logo and button share the first row; the navigation and the toggle share the second. */
  .site-nav {
    flex-basis: calc(100% - 52px);
    border-top: 0;
    padding-top: 0;
  }

  .theme-toggle {
    order: 4;
    margin-left: 0;
    width: 36px;
    height: 36px;
    align-self: start;
  }

  .mark {
    width: 34px;
    height: 34px;
  }

  .wordmark .name {
    font-size: 1.0625rem;
  }
}