:root {
  --ink: #111316;
  --muted: #5e656d;
  --line: #d9dee3;
  --soft: #f3f5f7;
  --paper: #ffffff;
  --steel: #27313a;
  --teal: #11656d;
  --teal-dark: #0b454c;
  --amber: #c9792b;
  --oxide: #9b3328;
  --shadow: 0 18px 50px rgba(17, 19, 22, 0.12);
  --radius: 8px;
  --container: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 16px;
  line-height: 1.65;
}

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

a {
  color: inherit;
}

address {
  font-style: normal;
}

.container {
  width: min(100% - 32px, var(--container));
  margin-inline: auto;
}

.skip-link {
  position: absolute;
  left: 16px;
  top: -80px;
  z-index: 100;
  padding: 10px 14px;
  background: var(--ink);
  color: var(--paper);
  border-radius: 6px;
  text-decoration: none;
}

.skip-link:focus {
  top: 16px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(10px);
}

.header-inner {
  min-height: 78px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  font-weight: 800;
  letter-spacing: 0;
}

.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 52px;
  height: 38px;
  border-radius: 6px;
  background: var(--steel);
  color: var(--paper);
  font-size: 0.9rem;
  letter-spacing: 0.04em;
}

.brand-copy {
  max-width: 210px;
  line-height: 1.1;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
}

.site-nav a {
  padding: 9px 14px;
  border-radius: 6px;
  color: var(--steel);
  text-decoration: none;
  font-weight: 700;
  font-size: 0.95rem;
}

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

.header-cta {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  padding: 9px 16px;
  border-radius: 6px;
  background: var(--amber);
  color: var(--paper);
  font-weight: 800;
  text-decoration: none;
}

.hero {
  position: relative;
  min-height: clamp(560px, 64vh, 660px);
  display: grid;
  align-items: center;
  overflow: hidden;
  color: var(--paper);
}

.hero-media,
.hero-shade {
  position: absolute;
  inset: 0;
}

.hero-media {
  background-image: url("../images/plasma-coating-hero-ai.png");
  background-size: cover;
  background-position: center;
}

.hero-shade {
  background: linear-gradient(90deg, rgba(17, 19, 22, 0.84) 0%, rgba(17, 19, 22, 0.64) 44%, rgba(17, 19, 22, 0.20) 100%);
}

.hero-content {
  position: relative;
  max-width: var(--container);
  padding-block: 72px;
}

.hero-content > * {
  max-width: 720px;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--amber);
  font-size: 0.78rem;
  font-weight: 900;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1,
h2,
h3 {
  line-height: 1.08;
  letter-spacing: 0;
}

h1 {
  margin-bottom: 22px;
  font-size: clamp(2.35rem, 5.2vw, 4rem);
}

h2 {
  margin-bottom: 18px;
  font-size: clamp(2rem, 4vw, 3.6rem);
}

h3 {
  margin-bottom: 12px;
  font-size: 1.25rem;
}

.hero-content p {
  color: rgba(255, 255, 255, 0.88);
  font-size: clamp(1.05rem, 2vw, 1.35rem);
}

.hero-actions,
.cta-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
}

.button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  padding: 12px 18px;
  border: 1px solid transparent;
  border-radius: 6px;
  font-weight: 800;
  text-decoration: none;
  cursor: pointer;
}

.button-primary {
  background: var(--teal);
  color: var(--paper);
}

.button-primary:hover {
  background: var(--teal-dark);
}

.button-secondary {
  border-color: rgba(255, 255, 255, 0.6);
  color: var(--paper);
  background: rgba(255, 255, 255, 0.08);
}

.button-secondary:hover {
  background: rgba(255, 255, 255, 0.18);
}

.trust-strip {
  background: var(--steel);
  color: var(--paper);
}

.trust-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
}

.trust-grid div {
  padding: 24px 28px;
  background: rgba(255, 255, 255, 0.05);
}

.trust-grid strong,
.trust-grid span {
  display: block;
}

.trust-grid strong {
  font-size: 1.35rem;
}

.trust-grid span {
  color: rgba(255, 255, 255, 0.74);
}

.section {
  padding-block: clamp(64px, 8vw, 110px);
}

.section-light {
  background: var(--soft);
}

.section-muted {
  background: #eef3f3;
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 0.9fr);
  gap: clamp(36px, 6vw, 72px);
  align-items: center;
}

.split.reverse {
  grid-template-columns: minmax(320px, 0.9fr) minmax(0, 1fr);
}

.split.reverse > :first-child {
  order: 2;
}

.content-stack p {
  color: var(--muted);
}

.image-panel,
.page-hero-image {
  overflow: hidden;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  background: var(--paper);
}

.image-panel img,
.page-hero-image img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.section-heading {
  max-width: 780px;
  margin-bottom: 34px;
}

.section-heading.narrow {
  max-width: 760px;
  margin-inline: auto;
  text-align: center;
}

.section-heading p {
  color: var(--muted);
}

.card-grid {
  display: grid;
  gap: 18px;
}

.card-grid.four {
  grid-template-columns: repeat(4, 1fr);
}

.service-card,
.process-box,
.spec-panel,
.contact-form,
.contact-details,
.timeline article,
.service-list article {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
}

.service-card {
  padding: 26px;
}

.card-number {
  display: inline-block;
  margin-bottom: 36px;
  color: var(--oxide);
  font-weight: 900;
}

.service-card p,
.process-box p,
.spec-panel p,
.service-list p,
.timeline p {
  color: var(--muted);
}

.check-list {
  display: grid;
  gap: 11px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.check-list li {
  position: relative;
  padding-left: 28px;
}

.check-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.65em;
  width: 12px;
  height: 8px;
  border-left: 3px solid var(--teal);
  border-bottom: 3px solid var(--teal);
  transform: rotate(-45deg);
}

.process-box,
.spec-panel {
  padding: clamp(26px, 4vw, 38px);
  box-shadow: var(--shadow);
}

.process-box ol {
  margin: 0;
  padding-left: 24px;
}

.process-box li + li {
  margin-top: 12px;
}

.cta-band {
  padding-block: 42px;
  background: var(--ink);
  color: var(--paper);
}

.cta-inner {
  justify-content: space-between;
}

.cta-inner h2 {
  max-width: 780px;
  margin-bottom: 0;
  font-size: clamp(1.8rem, 4vw, 3rem);
}

.page-hero {
  padding-block: clamp(64px, 9vw, 112px);
  background: var(--steel);
  color: var(--paper);
}

.page-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(320px, 0.7fr);
  gap: clamp(32px, 6vw, 70px);
  align-items: center;
}

.page-hero p:not(.eyebrow) {
  color: rgba(255, 255, 255, 0.78);
  font-size: 1.15rem;
}

.page-hero h1 {
  font-size: clamp(2.35rem, 6vw, 4.6rem);
}

.blog-article {
  background: var(--paper);
}

.blog-hero {
  position: relative;
  min-height: clamp(560px, 64vh, 680px);
  display: grid;
  align-items: end;
  overflow: hidden;
  color: var(--paper);
}

.blog-hero-media {
  position: absolute;
  inset: 0;
  background-image: url("../images/steel-mill-plasma-coating-service-sheffield-hero.png");
  background-size: cover;
  background-position: center;
}

.blog-hero-content {
  position: relative;
  padding-block: 90px 70px;
}

.blog-hero-content > * {
  max-width: 820px;
}

.blog-hero h1 {
  font-size: clamp(2.2rem, 5vw, 4.25rem);
}

.blog-hero p:not(.eyebrow) {
  color: rgba(255, 255, 255, 0.88);
  font-size: clamp(1.05rem, 2vw, 1.28rem);
}

.article-layout {
  display: grid;
  grid-template-columns: 310px minmax(0, 780px);
  gap: clamp(32px, 6vw, 72px);
  align-items: start;
  padding-block: clamp(58px, 8vw, 96px);
}

.article-sidebar {
  position: sticky;
  top: 108px;
}

.sidebar-box,
.article-callout {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--soft);
  padding: 28px;
}

.sidebar-box h2 {
  font-size: 1.55rem;
}

.sidebar-box p,
.article-content p,
.article-content li,
.article-image figcaption,
.faq-list p {
  color: var(--muted);
}

.article-content {
  min-width: 0;
}

.article-content .lead {
  color: var(--steel);
  font-size: 1.2rem;
  line-height: 1.75;
}

.article-content h2 {
  margin-top: 42px;
  font-size: clamp(1.7rem, 3vw, 2.4rem);
}

.article-content h3 {
  margin-top: 0;
}

.article-list {
  display: grid;
  gap: 12px;
  margin: 18px 0 0;
  padding-left: 22px;
}

.article-image {
  margin: 38px 0;
}

.article-image img {
  width: 100%;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.article-image figcaption {
  margin-top: 10px;
  font-size: 0.92rem;
}

.article-callout {
  margin-top: 42px;
  border-top: 5px solid var(--amber);
}

.article-callout h2 {
  margin-top: 0;
}

.faq-list {
  display: grid;
  gap: 16px;
}

.faq-list section {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
  background: var(--paper);
}

.service-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}

.service-list article {
  padding: 28px;
}

.application-columns {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 26px;
  margin-top: 28px;
}

.spec-panel {
  border-top: 5px solid var(--amber);
}

.timeline {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}

.timeline article {
  padding: 26px;
}

.timeline span {
  display: inline-grid;
  place-items: center;
  width: 42px;
  height: 42px;
  margin-bottom: 24px;
  border-radius: 50%;
  background: var(--teal);
  color: var(--paper);
  font-weight: 900;
}

.contact-grid {
  display: grid;
  grid-template-columns: minmax(300px, 0.75fr) minmax(0, 1fr);
  gap: clamp(28px, 5vw, 56px);
  align-items: start;
}

.contact-details,
.contact-form {
  padding: clamp(26px, 4vw, 40px);
  box-shadow: var(--shadow);
}

.contact-details address {
  margin-bottom: 24px;
  color: var(--muted);
  font-size: 1.1rem;
}

.contact-methods {
  display: grid;
  gap: 12px;
}

.contact-methods a {
  display: block;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  text-decoration: none;
  font-weight: 900;
}

.contact-methods a:hover {
  border-color: var(--teal);
}

.contact-methods span {
  display: block;
  color: var(--muted);
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.contact-form {
  display: grid;
  gap: 18px;
}

.form-row {
  display: grid;
  gap: 7px;
}

.form-row.two {
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

label {
  font-weight: 800;
}

input,
select,
textarea {
  width: 100%;
  border: 1px solid #cbd2d8;
  border-radius: 6px;
  padding: 12px 13px;
  font: inherit;
  color: var(--ink);
  background: var(--paper);
}

input:focus,
select:focus,
textarea:focus {
  outline: 3px solid rgba(17, 101, 109, 0.2);
  border-color: var(--teal);
}

textarea {
  resize: vertical;
}

.hidden-field {
  position: absolute;
  left: -9999px;
}

.site-footer {
  padding-top: 58px;
  background: #101316;
  color: var(--paper);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.3fr 0.8fr 0.6fr;
  gap: 34px;
}

.footer-grid p,
.footer-grid address {
  color: rgba(255, 255, 255, 0.72);
}

.footer-grid h2 {
  margin-bottom: 14px;
  font-size: 1rem;
}

.footer-grid a {
  display: block;
  width: fit-content;
  margin-bottom: 9px;
  color: rgba(255, 255, 255, 0.82);
  text-decoration: none;
}

.footer-grid a:hover {
  color: var(--paper);
}

.footer-brand {
  margin-bottom: 18px;
}

.footer-brand .brand-mark {
  background: var(--teal);
}

.footer-bottom {
  margin-top: 38px;
  padding-block: 18px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.92rem;
}

.footer-bottom p {
  margin-bottom: 0;
}

@media (max-width: 980px) {
  .header-inner {
    min-height: auto;
    padding-block: 14px;
    flex-wrap: wrap;
  }

  .site-nav {
    order: 3;
    width: 100%;
    justify-content: center;
  }

  .split,
  .split.reverse,
  .page-hero-grid,
  .contact-grid,
  .article-layout {
    grid-template-columns: 1fr;
  }

  .article-sidebar {
    position: static;
  }

  .split.reverse > :first-child {
    order: 0;
  }

  .card-grid.four,
  .timeline {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 700px) {
  .container {
    width: min(100% - 24px, var(--container));
  }

  .brand-copy {
    max-width: 160px;
    font-size: 0.95rem;
  }

  .brand-mark {
    width: 46px;
  }

  .header-cta {
    width: 100%;
  }

  .site-nav {
    overflow-x: auto;
    justify-content: flex-start;
  }

  .hero {
    min-height: 660px;
  }

  .hero-shade {
    background: rgba(17, 19, 22, 0.74);
  }

  .hero-content {
    padding-block: 72px;
  }

  .trust-grid,
  .service-list,
  .application-columns,
  .timeline,
  .card-grid.four,
  .form-row.two,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .trust-grid div {
    padding: 20px;
  }

  .section {
    padding-block: 58px;
  }

  .cta-inner {
    align-items: flex-start;
  }

  .button {
    width: 100%;
  }
}