/* ==========================================================================
   BWB Consulting Ltd - Master Design System Stylesheet
   Modernised Architectural & Civil Engineering Rebuild
   Based on design_brief.json (Playbook: trades, Variant A "Bold and dependable")
   Target locality: Birmingham, West Midlands, United Kingdom
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Design Tokens & Root Custom Properties (Strict Palette Lock)
   -------------------------------------------------------------------------- */
:root {
  /* Exact Hex Palette from design_brief.json */
  --color-background: #f8f8f9;
  --color-surface: #ffffff;
  --color-text: #111827;
  --color-muted: #4b5563;
  --color-primary: #da0c1d;
  --color-primary-text: #ffffff;
  --color-accent: #0284c7;
  --color-dark: #0d0e13;
  --color-dark-text: #ffffff;

  /* Derived functional shades strictly from palette */
  --color-primary-hover: #b80918;
  --color-primary-subtle: rgba(218, 12, 29, 0.08);
  --color-primary-border: rgba(218, 12, 29, 0.25);
  --color-accent-hover: #0369a1;
  --color-accent-subtle: rgba(2, 132, 199, 0.08);
  --color-accent-border: rgba(2, 132, 199, 0.25);
  
  --color-border: rgba(17, 24, 39, 0.12);
  --color-border-subtle: rgba(17, 24, 39, 0.06);
  --color-border-focus: #da0c1d;
  
  --color-dark-surface: #171922;
  --color-dark-border: rgba(255, 255, 255, 0.14);
  --color-dark-muted: #9ca3af;

  /* Typography Families from design_brief.json */
  --font-display: 'Archivo', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-body: 'Public Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;

  /* Fluid Typography Scale (clamp) */
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-md: 1.125rem;
  --font-size-lg: clamp(1.25rem, 1.2vw + 1rem, 1.5rem);
  --font-size-xl: clamp(1.5rem, 2vw + 1rem, 2rem);
  --font-size-2xl: clamp(1.85rem, 2.5vw + 1.2rem, 2.5rem);
  --font-size-3xl: clamp(2.25rem, 3.8vw + 1.2rem, 3.5rem);
  --font-size-hero: clamp(2.35rem, 4.2vw + 1.4rem, 3.85rem);

  /* Spacing Scale */
  --space-2xs: 0.25rem;
  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4.5rem;
  --space-4xl: 6rem;

  /* Structural Dimensions */
  --container-max-width: 1320px;
  --header-height: 80px;
  --header-height-mobile: 70px;
  --border-radius-sm: 4px;
  --border-radius-md: 8px;
  --border-radius-lg: 12px;
  --border-radius-xl: 16px;
  --border-radius-full: 9999px;

  /* Elevation Shadows */
  --shadow-sm: 0 1px 3px rgba(17, 24, 39, 0.08);
  --shadow-md: 0 4px 12px rgba(17, 24, 39, 0.08), 0 2px 4px rgba(17, 24, 39, 0.04);
  --shadow-lg: 0 12px 32px rgba(17, 24, 39, 0.1), 0 4px 8px rgba(17, 24, 39, 0.05);
  --shadow-xl: 0 20px 48px rgba(17, 24, 39, 0.14), 0 8px 16px rgba(17, 24, 39, 0.08);

  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 250ms ease-in-out;
  --transition-slow: 400ms cubic-bezier(0.16, 1, 0.3, 1);
}

/* --------------------------------------------------------------------------
   2. Reset & Core Base Rules
   -------------------------------------------------------------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-background);
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  text-rendering: optimizeLegibility;
}

/* Prevent horizontal overflow on root without disabling sticky headers */
html,
body {
  overflow-x: clip;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  position: relative;
  font-weight: 400;
  color: var(--color-text);
  background-color: var(--color-background);
}

/* Typography Hierarchy */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.18;
  color: var(--color-text);
  text-wrap: balance;
  letter-spacing: -0.02em;
}

h1 {
  font-size: var(--font-size-hero);
  font-weight: 800;
}

h2 {
  font-size: var(--font-size-2xl);
  margin-bottom: var(--space-md);
}

h3 {
  font-size: var(--font-size-xl);
  font-weight: 700;
  margin-bottom: var(--space-sm);
}

h4 {
  font-size: var(--font-size-lg);
  font-weight: 700;
  margin-bottom: var(--space-xs);
}

p {
  margin-bottom: var(--space-md);
  color: var(--color-muted);
  max-width: 72ch;
}

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

a {
  color: var(--color-primary);
  text-decoration: underline;
  text-decoration-thickness: 1.5px;
  text-underline-offset: 3px;
  transition: color var(--transition-fast), text-decoration-color var(--transition-fast);
}

a:hover {
  color: var(--color-primary-hover);
}

img,
picture,
video,
canvas,
svg {
  display: block;
  max-width: 100%;
  height: auto;
}

ul,
ol {
  list-style-position: inside;
  margin-bottom: var(--space-md);
}

button,
input,
textarea,
select {
  font: inherit;
  color: inherit;
}

button {
  background: none;
  border: none;
  cursor: pointer;
}

/* WCAG 2.4.7 Visible Keyboard Focus (remediates audit_291.json Critical issue) */
:focus-visible {
  outline: 3px solid var(--color-primary) !important;
  outline-offset: 3px !important;
}

/* Accessible Skip Link (remediates audit_291.json High issue) */
.skip-link {
  position: absolute;
  top: -100px;
  left: var(--space-md);
  z-index: 99999;
  padding: var(--space-sm) var(--space-lg);
  background: var(--color-dark);
  color: var(--color-dark-text);
  text-decoration: none;
  font-weight: 700;
  border-radius: var(--border-radius-sm);
  border: 2px solid var(--color-primary);
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: var(--space-md);
}

/* Screen reader utility */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* Main Container */
.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin-inline: auto;
  padding-inline: var(--space-md);
}

@media (min-width: 768px) {
  .container {
    padding-inline: var(--space-xl);
  }
}

/* --------------------------------------------------------------------------
   3. Header & Navigation (Always Sticky, Strict Keyboard Accessible)
   -------------------------------------------------------------------------- */
.header {
  position: sticky;
  top: 0;
  z-index: 1000;
  width: 100%;
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-fast), background-color var(--transition-fast);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height-mobile);
}

@media (min-width: 1024px) {
  .header__inner {
    height: var(--header-height);
  }
}

.header__logo {
  display: flex;
  align-items: center;
  text-decoration: none;
  flex-shrink: 0;
  padding: var(--space-xs) 0;
}

.header__logo-img {
  height: 38px;
  width: auto;
  object-fit: contain;
}

@media (min-width: 1024px) {
  .header__logo-img {
    height: 46px;
  }
}

/* Desktop Navigation */
.header__nav {
  display: none;
}

@media (min-width: 1024px) {
  .header__nav {
    display: flex;
    align-items: center;
    gap: var(--space-xl);
  }
}

.nav__list {
  display: flex;
  align-items: center;
  list-style: none;
  margin: 0;
  gap: var(--space-lg);
}

.nav__item {
  position: relative;
}

.nav__link {
  font-family: var(--font-body);
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-text);
  text-decoration: none;
  padding: var(--space-xs) var(--space-2xs);
  display: inline-flex;
  align-items: center;
  gap: 4px;
  position: relative;
  transition: color var(--transition-fast);
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-primary);
  transition: width var(--transition-base);
}

.nav__link:hover,
.nav__link.is-active {
  color: var(--color-primary);
}

.nav__link.is-active::after,
.nav__link:hover::after {
  width: 100%;
}

/* Dropdown Support with Keyboard focus-within */
.nav__dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 240px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-md);
  box-shadow: var(--shadow-lg);
  padding: var(--space-xs) 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity var(--transition-fast), transform var(--transition-fast), visibility var(--transition-fast);
  z-index: 1010;
  list-style: none;
}

.nav__item:hover .nav__dropdown,
.nav__item:focus-within .nav__dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.nav__dropdown-link {
  display: block;
  padding: var(--space-xs) var(--space-md);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text);
  text-decoration: none;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.nav__dropdown-link:hover,
.nav__dropdown-link:focus-visible {
  background-color: var(--color-background);
  color: var(--color-primary);
}

/* Header CTAs */
.header__actions {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.header__phone-link {
  display: none;
  align-items: center;
  gap: var(--space-xs);
  font-size: var(--font-size-sm);
  font-weight: 700;
  color: var(--color-text);
  text-decoration: none;
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--border-radius-sm);
  border: 1px solid var(--color-border);
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.header__phone-link:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

@media (min-width: 768px) {
  .header__phone-link {
    display: inline-flex;
  }
}

.header__cta-btn {
  display: none;
}

@media (min-width: 1024px) {
  .header__cta-btn {
    display: inline-flex;
  }
}

/* Mobile Hamburger Toggle */
.header__menu-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 48px;
  height: 48px;
  border-radius: var(--border-radius-sm);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  cursor: pointer;
  z-index: 1002;
  transition: background-color var(--transition-fast);
}

@media (min-width: 1024px) {
  .header__menu-toggle {
    display: none;
  }
}

.menu-toggle__bar {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-text);
  transition: transform var(--transition-base), opacity var(--transition-base);
  margin: 3px 0;
}

.header__menu-toggle[aria-expanded="true"] .menu-toggle__bar:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

.header__menu-toggle[aria-expanded="true"] .menu-toggle__bar:nth-child(2) {
  opacity: 0;
}

.header__menu-toggle[aria-expanded="true"] .menu-toggle__bar:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

/* Mobile Navigation Drawer */
.mobile-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--color-surface);
  z-index: 1001;
  padding: calc(var(--header-height-mobile) + var(--space-lg)) var(--space-lg) var(--space-4xl);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  opacity: 0;
  visibility: hidden;
  transform: translateX(100%);
  transition: opacity var(--transition-base), transform var(--transition-base), visibility var(--transition-base);
}

.mobile-nav.is-open {
  opacity: 1;
  visibility: visible;
  transform: translateX(0);
}

.mobile-nav__list {
  list-style: none;
  margin: 0 0 var(--space-xl) 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.mobile-nav__link {
  font-family: var(--font-display);
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-text);
  text-decoration: none;
  display: block;
  padding: var(--space-xs) 0;
  border-bottom: 1px solid var(--color-border-subtle);
}

.mobile-nav__link.is-active {
  color: var(--color-primary);
}

.mobile-nav__cta {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  margin-top: auto;
}

/* --------------------------------------------------------------------------
   4. Buttons & Badges (Variant A: Bold, Chunkier, High-Contrast)
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  padding: 0.85rem 1.6rem;
  font-family: var(--font-body);
  font-size: var(--font-size-sm);
  font-weight: 700;
  line-height: 1.2;
  text-decoration: none;
  border-radius: var(--border-radius-sm);
  border: 2px solid transparent;
  cursor: pointer;
  transition: background-color var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
  min-height: 48px;
  min-width: 48px;
  text-align: center;
}

.btn:active {
  transform: scale(0.98);
}

.btn--primary {
  background-color: var(--color-primary);
  color: var(--color-primary-text);
  border-color: var(--color-primary);
  box-shadow: 0 4px 14px rgba(218, 12, 29, 0.28);
}

.btn--primary:hover {
  background-color: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
  color: var(--color-primary-text);
  box-shadow: 0 6px 20px rgba(218, 12, 29, 0.38);
}

.btn--secondary {
  background-color: var(--color-surface);
  color: var(--color-text);
  border-color: var(--color-text);
}

.btn--secondary:hover {
  background-color: var(--color-text);
  color: var(--color-surface);
  border-color: var(--color-text);
}

.btn--accent {
  background-color: var(--color-accent);
  color: var(--color-surface);
  border-color: var(--color-accent);
}

.btn--accent:hover {
  background-color: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
}

.btn--outline-white {
  background-color: transparent;
  color: var(--color-surface);
  border-color: var(--color-surface);
}

.btn--outline-white:hover {
  background-color: var(--color-surface);
  color: var(--color-dark);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  font-family: var(--font-body);
  font-size: var(--font-size-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-radius: var(--border-radius-full);
}

.badge--primary {
  background-color: var(--color-primary-subtle);
  color: var(--color-primary);
  border: 1px solid var(--color-primary-border);
}

.badge--accent {
  background-color: var(--color-accent-subtle);
  color: var(--color-accent);
  border: 1px solid var(--color-accent-border);
}

.badge--dark {
  background-color: var(--color-dark);
  color: var(--color-dark-text);
}

/* --------------------------------------------------------------------------
   5. Hero Section (Split Layout, Archivo Heavyweight, Verified Proof)
   -------------------------------------------------------------------------- */
.hero {
  position: relative;
  padding-block: var(--space-xl) var(--space-2xl);
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

@media (min-width: 1024px) {
  .hero {
    padding-block: var(--space-3xl) var(--space-4xl);
  }
}

.hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2xl);
  align-items: center;
}

@media (min-width: 1024px) {
  .hero__grid {
    grid-template-columns: 1.15fr 0.85fr;
    gap: var(--space-3xl);
  }
}

.hero__content {
  display: flex;
  flex-direction: column;
}

.hero__badge-row {
  margin-bottom: var(--space-md);
}

.hero__headline {
  font-size: var(--font-size-hero);
  font-weight: 800;
  line-height: 1.08;
  color: var(--color-text);
  margin-bottom: var(--space-md);
  letter-spacing: -0.03em;
}

.hero__subheadline {
  font-size: var(--font-size-md);
  line-height: 1.6;
  color: var(--color-muted);
  margin-bottom: var(--space-xl);
}

@media (min-width: 768px) {
  .hero__subheadline {
    font-size: var(--font-size-lg);
  }
}

.hero__cta-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  margin-bottom: var(--space-xl);
}

@media (min-width: 540px) {
  .hero__cta-group {
    flex-direction: row;
    align-items: center;
  }
}

.hero__proof-strip {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-sm);
  padding-top: var(--space-md);
  border-top: 1px solid var(--color-border-subtle);
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-text);
}

.proof-strip__rating {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  color: #b45309; /* Deep accessible amber */
}

.proof-strip__star {
  color: #f59e0b;
}

.proof-strip__separator {
  color: var(--color-border);
}

/* Hero Media Wrapper (Fixes CLS with explicit aspect-ratio) */
.hero__media {
  position: relative;
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
  aspect-ratio: 16 / 10;
  background-color: var(--color-dark);
}

.hero__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.hero__media:hover .hero__img {
  transform: scale(1.02);
}

.hero__media-caption {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: var(--space-md) var(--space-lg);
  background: linear-gradient(to top, rgba(13, 14, 19, 0.95), rgba(13, 14, 19, 0));
  color: var(--color-dark-text);
  font-size: var(--font-size-xs);
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
}

.hero__caption-tag {
  font-weight: 700;
  text-transform: uppercase;
  color: var(--color-primary);
  display: block;
}

/* --------------------------------------------------------------------------
   6. Trust Strip Section (#trust-strip)
   -------------------------------------------------------------------------- */
.trust-strip {
  padding-block: var(--space-xl);
  background-color: var(--color-dark);
  color: var(--color-dark-text);
}

.trust-strip__header {
  text-align: center;
  margin-bottom: var(--space-lg);
}

.trust-strip__header h2 {
  font-size: var(--font-size-sm);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-dark-muted);
  margin-bottom: 0;
}

.trust-strip__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
  align-items: center;
}

@media (min-width: 768px) {
  .trust-strip__grid {
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-xl);
  }
}

.trust-card {
  padding: var(--space-md);
  border-radius: var(--border-radius-md);
  background-color: var(--color-dark-surface);
  border: 1px solid var(--color-dark-border);
  text-align: center;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  min-height: 110px;
}

.trust-card__metric {
  font-family: var(--font-display);
  font-size: var(--font-size-xl);
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1.1;
  margin-bottom: 4px;
}

.trust-card__label {
  font-size: var(--font-size-xs);
  font-weight: 600;
  color: var(--color-dark-muted);
}

.trust-card__logo {
  max-height: 42px;
  width: auto;
  filter: brightness(0) invert(1);
  object-fit: contain;
}

/* --------------------------------------------------------------------------
   7. Services Grid Section (#services-grid)
   -------------------------------------------------------------------------- */
.section {
  padding-block: var(--space-3xl);
  position: relative;
}

@media (min-width: 1024px) {
  .section {
    padding-block: var(--space-4xl);
  }
}

.section--surface {
  background-color: var(--color-surface);
}

.section--alt {
  background-color: var(--color-background);
}

.section--dark {
  background-color: var(--color-dark);
  color: var(--color-dark-text);
}

.section--dark h2,
.section--dark h3 {
  color: var(--color-dark-text);
}

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

.section__intro {
  margin-bottom: var(--space-2xl);
  max-width: 760px;
}

.section__intro--center {
  margin-inline: auto;
  text-align: center;
}

.section__tagline {
  font-size: var(--font-size-sm);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-primary);
  margin-bottom: var(--space-xs);
}

.section__title {
  font-size: var(--font-size-2xl);
  line-height: 1.15;
  margin-bottom: var(--space-md);
}

.section__description {
  font-size: var(--font-size-md);
}

/* Services Grid */
.services-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
}

@media (min-width: 640px) {
  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .services-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.service-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-md);
  padding: var(--space-xl);
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
  position: relative;
}

.service-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary);
}

.service-card__icon-wrap {
  width: 52px;
  height: 52px;
  border-radius: var(--border-radius-sm);
  background-color: var(--color-primary-subtle);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-md);
  border: 1px solid var(--color-primary-border);
}

.service-card__icon {
  width: 26px;
  height: 26px;
}

.service-card__title {
  font-size: var(--font-size-lg);
  font-weight: 700;
  margin-bottom: var(--space-sm);
  color: var(--color-text);
}

.service-card__desc {
  font-size: var(--font-size-sm);
  color: var(--color-muted);
  margin-bottom: var(--space-md);
  flex-grow: 1;
}

.service-card__features {
  list-style: none;
  padding: 0;
  margin: 0 0 var(--space-md) 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: var(--font-size-xs);
  color: var(--color-text);
  font-weight: 600;
}

.service-card__features li {
  display: flex;
  align-items: center;
  gap: 6px;
}

.service-card__features li::before {
  content: '✓';
  color: var(--color-primary);
  font-weight: 800;
}

.service-card__link {
  font-size: var(--font-size-sm);
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.service-card__link:hover {
  text-decoration: underline;
}

/* Feature Spotlight Card (Lead Coordination) */
.service-spotlight {
  grid-column: 1 / -1;
  background-color: var(--color-dark);
  color: var(--color-dark-text);
  border-radius: var(--border-radius-lg);
  padding: var(--space-xl);
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
  align-items: center;
}

@media (min-width: 1024px) {
  .service-spotlight {
    grid-template-columns: 1.2fr 0.8fr;
    padding: var(--space-2xl);
  }
}

.service-spotlight__content h3 {
  color: var(--color-dark-text);
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-sm);
}

.service-spotlight__content p {
  color: var(--color-dark-muted);
  margin-bottom: var(--space-md);
}

.service-spotlight__media {
  border-radius: var(--border-radius-md);
  overflow: hidden;
  aspect-ratio: 16 / 10;
}

.service-spotlight__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* --------------------------------------------------------------------------
   8. Market Sectors (#market-sectors)
   -------------------------------------------------------------------------- */
.sectors-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-sm);
}

@media (min-width: 640px) {
  .sectors-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
  }
}

@media (min-width: 1024px) {
  .sectors-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.sector-chip {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-md);
  padding: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-2xs);
  transition: all var(--transition-fast);
  text-decoration: none;
}

.sector-chip:hover {
  border-color: var(--color-primary);
  background-color: var(--color-background);
  transform: translateY(-2px);
}

.sector-chip__title {
  font-family: var(--font-display);
  font-size: var(--font-size-base);
  font-weight: 700;
  color: var(--color-text);
  margin: 0;
}

.sector-chip__lead {
  font-size: var(--font-size-xs);
  color: var(--color-muted);
}

/* --------------------------------------------------------------------------
   9. Signature Section: Interactive UK Coverage Map (#areas-covered)
   Variant A Signature: "Areas we cover" chip cloud + interactive map
   -------------------------------------------------------------------------- */
.coverage-explorer {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2xl);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  padding: var(--space-lg);
  box-shadow: var(--shadow-md);
}

@media (min-width: 1024px) {
  .coverage-explorer {
    grid-template-columns: 1fr 1.3fr;
    padding: var(--space-2xl);
    gap: var(--space-3xl);
  }
}

/* Office selector buttons / chips */
.hub-selector {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-bottom: var(--space-lg);
}

.hub-btn {
  padding: 0.6rem 1rem;
  border-radius: var(--border-radius-full);
  border: 1px solid var(--color-border);
  background: var(--color-background);
  font-size: var(--font-size-sm);
  font-weight: 700;
  color: var(--color-text);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.hub-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.hub-btn.is-active {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-primary-text);
}

/* Interactive SVG Map Canvas */
.map-canvas-wrap {
  position: relative;
  background-color: #f1f3f6;
  border-radius: var(--border-radius-md);
  border: 1px solid var(--color-border);
  padding: var(--space-md);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.uk-svg-map {
  width: 100%;
  max-width: 440px;
  height: auto;
  display: block;
}

.map-region {
  fill: #e2e5ea;
  stroke: #ffffff;
  stroke-width: 1.5;
  transition: fill var(--transition-fast);
}

.map-region:hover {
  fill: #cbd5e1;
}

.map-pin {
  cursor: pointer;
  transition: transform var(--transition-fast);
}

.map-pin circle.outer {
  fill: rgba(218, 12, 29, 0.25);
  animation: pulsePin 2s infinite ease-out;
}

.map-pin circle.inner {
  fill: var(--color-primary);
  stroke: #ffffff;
  stroke-width: 2;
}

.map-pin.is-active circle.inner {
  fill: var(--color-dark);
  stroke: var(--color-primary);
  stroke-width: 3;
}

.map-pin text {
  font-family: var(--font-body);
  font-size: 11px;
  font-weight: 700;
  fill: var(--color-text);
}

@keyframes pulsePin {
  0% { r: 8; opacity: 1; }
  100% { r: 18; opacity: 0; }
}

/* Hub Detail Card (Dynamically updated via JS) */
.hub-detail-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.hub-detail-card__header {
  margin-bottom: var(--space-md);
}

.hub-detail-card__title {
  font-size: var(--font-size-xl);
  font-weight: 800;
  margin-bottom: 4px;
}

.hub-detail-card__tag {
  font-size: var(--font-size-xs);
  font-weight: 700;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.hub-detail-card__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

@media (min-width: 640px) {
  .hub-detail-card__grid {
    grid-template-columns: 1fr 1fr;
  }
}

.hub-info-block {
  padding: var(--space-md);
  background-color: var(--color-background);
  border-radius: var(--border-radius-md);
  border: 1px solid var(--color-border-subtle);
}

.hub-info-block__label {
  font-size: var(--font-size-xs);
  font-weight: 700;
  text-transform: uppercase;
  color: var(--color-muted);
  margin-bottom: 4px;
}

.hub-info-block__value {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-text);
}

.hub-detail-card__media {
  border-radius: var(--border-radius-md);
  overflow: hidden;
  aspect-ratio: 16 / 9;
  margin-bottom: var(--space-md);
  background-color: var(--color-dark);
}

.hub-detail-card__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* --------------------------------------------------------------------------
   10. Recent Work & Landmark Projects Gallery (#recent-work-gallery)
   -------------------------------------------------------------------------- */
.project-gallery-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
}

@media (min-width: 768px) {
  .project-gallery-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.project-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.project-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

.project-card__media {
  position: relative;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background-color: var(--color-dark);
}

.project-card__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.project-card:hover .project-card__img {
  transform: scale(1.04);
}

.project-card__badge-row {
  position: absolute;
  top: var(--space-md);
  left: var(--space-md);
  display: flex;
  gap: var(--space-2xs);
}

.project-card__content {
  padding: var(--space-xl);
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.project-card__title {
  font-size: var(--font-size-lg);
  font-weight: 800;
  margin-bottom: var(--space-xs);
  color: var(--color-text);
}

.project-card__meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  font-size: var(--font-size-xs);
  color: var(--color-muted);
  margin-bottom: var(--space-md);
  font-weight: 600;
}

.project-card__meta-item {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.project-card__desc {
  font-size: var(--font-size-sm);
  color: var(--color-muted);
  margin-bottom: var(--space-lg);
  flex-grow: 1;
}

.project-card__stat-bar {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-sm);
  padding-top: var(--space-md);
  border-top: 1px solid var(--color-border-subtle);
}

.project-stat__label {
  font-size: var(--font-size-xs);
  color: var(--color-muted);
  text-transform: uppercase;
}

.project-stat__value {
  font-family: var(--font-display);
  font-size: var(--font-size-md);
  font-weight: 800;
  color: var(--color-primary);
}

/* --------------------------------------------------------------------------
   11. The Four Ps Framework (#four-ps-framework)
   -------------------------------------------------------------------------- */
.four-ps-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
}

@media (min-width: 640px) {
  .four-ps-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .four-ps-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.pillar-card {
  background-color: var(--color-dark-surface);
  border: 1px solid var(--color-dark-border);
  border-radius: var(--border-radius-md);
  padding: var(--space-xl);
  display: flex;
  flex-direction: column;
}

.pillar-card__letter {
  font-family: var(--font-display);
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1;
  color: var(--color-primary);
  margin-bottom: var(--space-xs);
}

.pillar-card__title {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-dark-text);
  margin-bottom: var(--space-sm);
}

.pillar-card__desc {
  font-size: var(--font-size-sm);
  color: var(--color-dark-muted);
  margin-bottom: 0;
}

/* --------------------------------------------------------------------------
   12. Testimonials & Client Endorsements (#testimonials)
   -------------------------------------------------------------------------- */
.testimonials-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
}

@media (min-width: 768px) {
  .testimonials-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.testimonial-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  padding: var(--space-xl);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.testimonial-card__quote {
  font-size: var(--font-size-md);
  font-style: italic;
  color: var(--color-text);
  margin-bottom: var(--space-lg);
  line-height: 1.55;
}

.testimonial-card__author {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  border-top: 1px solid var(--color-border-subtle);
  padding-top: var(--space-md);
}

.testimonial-author__info {
  display: flex;
  flex-direction: column;
}

.testimonial-author__name {
  font-size: var(--font-size-sm);
  font-weight: 700;
  color: var(--color-text);
}

.testimonial-author__role {
  font-size: var(--font-size-xs);
  color: var(--color-muted);
}

/* Partner Logos Strip */
.client-logos {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: var(--space-xl) var(--space-2xl);
  margin-top: var(--space-3xl);
  padding-top: var(--space-2xl);
  border-top: 1px solid var(--color-border-subtle);
}

.client-logo-item img {
  max-height: 48px;
  width: auto;
  opacity: 0.85;
  filter: grayscale(100%);
  transition: filter var(--transition-fast), opacity var(--transition-fast);
}

.client-logo-item img:hover {
  filter: grayscale(0%);
  opacity: 1;
}

/* --------------------------------------------------------------------------
   13. How We Deliver: The Single Project Lead Model (#delivery-approach)
   -------------------------------------------------------------------------- */
.process-steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
}

@media (min-width: 640px) {
  .process-steps {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .process-steps {
    grid-template-columns: repeat(4, 1fr);
  }
}

.step-card {
  position: relative;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-md);
  padding: var(--space-xl);
  display: flex;
  flex-direction: column;
}

.step-card__number {
  font-family: var(--font-display);
  font-size: var(--font-size-2xl);
  font-weight: 800;
  color: var(--color-primary);
  margin-bottom: var(--space-xs);
}

.step-card__title {
  font-size: var(--font-size-md);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-xs);
}

.step-card__desc {
  font-size: var(--font-size-sm);
  color: var(--color-muted);
  margin-bottom: 0;
}

/* --------------------------------------------------------------------------
   14. FAQ Section (#faq) - AEO/GEO Optimized & Remediated
   -------------------------------------------------------------------------- */
.faq-accordion {
  max-width: 860px;
  margin-inline: auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.faq-item {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-md);
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

.faq-item[open] {
  border-color: var(--color-primary);
}

.faq-summary {
  padding: var(--space-lg);
  font-family: var(--font-display);
  font-size: var(--font-size-md);
  font-weight: 700;
  color: var(--color-text);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  list-style: none;
  user-select: none;
}

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

.faq-summary::after {
  content: '+';
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-primary);
  transition: transform var(--transition-fast);
}

.faq-item[open] .faq-summary::after {
  content: '−';
}

.faq-content {
  padding: 0 var(--space-lg) var(--space-lg);
  font-size: var(--font-size-sm);
  color: var(--color-muted);
  line-height: 1.65;
}

/* --------------------------------------------------------------------------
   15. Project Consultation Section (#project-consultation)
   -------------------------------------------------------------------------- */
.consultation-wrap {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2xl);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

@media (min-width: 1024px) {
  .consultation-wrap {
    grid-template-columns: 1fr 1.1fr;
  }
}

.consultation__info {
  padding: var(--space-xl);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  background-color: var(--color-dark);
  color: var(--color-dark-text);
}

@media (min-width: 768px) {
  .consultation__info {
    padding: var(--space-2xl);
  }
}

.consultation__info h3 {
  color: var(--color-dark-text);
  font-size: var(--font-size-2xl);
  margin-bottom: var(--space-sm);
}

.consultation__info p {
  color: var(--color-dark-muted);
  margin-bottom: var(--space-lg);
}

.consultation__contact-list {
  list-style: none;
  padding: 0;
  margin: 0 0 var(--space-xl) 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.consultation__contact-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
}

.contact-icon {
  width: 22px;
  height: 22px;
  color: var(--color-primary);
  flex-shrink: 0;
  margin-top: 2px;
}

.contact-text strong {
  display: block;
  font-size: var(--font-size-xs);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-dark-muted);
}

.contact-text a,
.contact-text span {
  font-size: var(--font-size-sm);
  color: var(--color-dark-text);
  font-weight: 600;
  text-decoration: none;
}

.contact-text a:hover {
  color: var(--color-primary);
  text-decoration: underline;
}

/* Map Iframe Container */
.consultation__map {
  border-radius: var(--border-radius-md);
  overflow: hidden;
  margin-top: var(--space-lg);
  border: 1px solid var(--color-dark-border);
}

.consultation__map iframe {
  display: block;
  width: 100%;
  height: 220px;
  border: 0;
}

/* Consultation Form */
.consultation__form-panel {
  padding: var(--space-xl);
}

@media (min-width: 768px) {
  .consultation__form-panel {
    padding: var(--space-2xl);
  }
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
}

@media (min-width: 640px) {
  .form-grid--2col {
    grid-template-columns: repeat(2, 1fr);
  }
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-group--full {
  grid-column: 1 / -1;
}

.form-label {
  font-size: var(--font-size-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text);
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  font-size: var(--font-size-sm);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-sm);
  background-color: var(--color-background);
  color: var(--color-text);
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  background-color: var(--color-surface);
  border-color: var(--color-primary);
  outline: none;
}

.form-textarea {
  resize: vertical;
  min-height: 110px;
}

.form-privacy-note {
  font-size: var(--font-size-xs);
  color: var(--color-muted);
}

/* --------------------------------------------------------------------------
   16. Rapid Response Emergency Band (#rapid-response-band)
   Playbook Trades must-have: fast mobilization for site constraints
   -------------------------------------------------------------------------- */
.rapid-band {
  background: linear-gradient(135deg, var(--color-dark) 0%, #1f0507 100%);
  color: var(--color-dark-text);
  padding-block: var(--space-xl);
  border-block: 2px solid var(--color-primary);
}

.rapid-band__inner {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  align-items: center;
  justify-content: space-between;
  text-align: center;
}

@media (min-width: 768px) {
  .rapid-band__inner {
    flex-direction: row;
    text-align: left;
  }
}

.rapid-band__content h3 {
  color: var(--color-dark-text);
  font-size: var(--font-size-lg);
  margin-bottom: 4px;
}

.rapid-band__content p {
  color: var(--color-dark-muted);
  font-size: var(--font-size-sm);
  margin: 0;
}

.rapid-band__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  flex-shrink: 0;
}

/* --------------------------------------------------------------------------
   17. Footer & Multi-Column Corporate Directory
   -------------------------------------------------------------------------- */
.footer {
  background-color: var(--color-dark);
  color: var(--color-dark-text);
  padding-top: var(--space-4xl);
  padding-bottom: calc(var(--space-2xl) + 60px); /* extra clearance for mobile sticky bar */
  border-top: 1px solid var(--color-dark-border);
  margin-top: auto;
}

@media (min-width: 768px) {
  .footer {
    padding-bottom: var(--space-3xl);
  }
}

.footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2xl);
  margin-bottom: var(--space-3xl);
}

@media (min-width: 640px) {
  .footer__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .footer__grid {
    grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  }
}

.footer__brand-col {
  display: flex;
  flex-direction: column;
}

.footer__logo {
  margin-bottom: var(--space-md);
}

.footer__logo-img {
  height: 44px;
  width: auto;
  filter: brightness(0) invert(1);
}

.footer__desc {
  font-size: var(--font-size-sm);
  color: var(--color-dark-muted);
  margin-bottom: var(--space-md);
}

.footer__parent-badge {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--border-radius-sm);
  background-color: var(--color-dark-surface);
  border: 1px solid var(--color-dark-border);
  margin-top: var(--space-sm);
}

.footer__parent-badge span {
  font-size: var(--font-size-xs);
  color: var(--color-dark-muted);
}

.footer__parent-logo {
  height: 24px;
  width: auto;
  filter: brightness(0) invert(1);
}

.footer__title {
  font-size: var(--font-size-sm);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-dark-text);
  margin-bottom: var(--space-md);
}

.footer__links {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.footer__link {
  font-size: var(--font-size-sm);
  color: var(--color-dark-muted);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer__link:hover {
  color: var(--color-primary-text);
  text-decoration: underline;
}

/* Regional Hub Mini Directory in Footer */
.footer-hubs {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.footer-hub-item {
  font-size: var(--font-size-xs);
  color: var(--color-dark-muted);
}

.footer-hub-item strong {
  color: var(--color-dark-text);
  display: block;
}

.footer-hub-item a {
  color: var(--color-dark-muted);
  text-decoration: none;
}

.footer-hub-item a:hover {
  color: var(--color-primary);
}

/* Footer Bottom Bar (WCAG AA Compliant contrast) */
.footer__bottom {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  padding-top: var(--space-xl);
  border-top: 1px solid var(--color-dark-border);
  font-size: var(--font-size-xs);
  color: var(--color-dark-muted);
}

@media (min-width: 768px) {
  .footer__bottom {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }
}

.footer__legal-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer__legal-links a {
  color: var(--color-dark-muted);
  text-decoration: none;
}

.footer__legal-links a:hover {
  color: var(--color-dark-text);
  text-decoration: underline;
}

.footer__credits {
  font-size: var(--font-size-xs);
  color: var(--color-dark-muted);
}

/* --------------------------------------------------------------------------
   18. Mobile Sticky Action Bar (Playbook: trades requirement)
   -------------------------------------------------------------------------- */
.mobile-action-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 999;
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
  box-shadow: 0 -4px 16px rgba(0, 0, 0, 0.1);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xs);
  padding: var(--space-xs) var(--space-md);
}

@media (min-width: 769px) {
  .mobile-action-bar {
    display: none;
  }
}

.mobile-action-bar .btn {
  padding: 0.65rem 0.5rem;
  font-size: 0.85rem;
  min-height: 44px;
}

/* --------------------------------------------------------------------------
   19. Back to Top Button
   -------------------------------------------------------------------------- */
.back-to-top {
  position: fixed;
  bottom: 5.5rem;
  right: var(--space-md);
  z-index: 998;
  width: 48px;
  height: 48px;
  border-radius: var(--border-radius-full);
  background-color: var(--color-dark);
  color: var(--color-dark-text);
  border: 1px solid var(--color-dark-border);
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity var(--transition-fast), transform var(--transition-fast), visibility var(--transition-fast), background-color var(--transition-fast);
}

@media (min-width: 769px) {
  .back-to-top {
    bottom: var(--space-xl);
    right: var(--space-xl);
  }
}

.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background-color: var(--color-primary);
}

.back-to-top svg {
  width: 22px;
  height: 22px;
}

/* --------------------------------------------------------------------------
   20. Subpages Styling (About, Services, Projects, Contact)
   -------------------------------------------------------------------------- */
/* Page Header / Subpage Hero */
.page-hero {
  padding-block: var(--space-2xl) var(--space-3xl);
  background-color: var(--color-dark);
  color: var(--color-dark-text);
  border-bottom: 3px solid var(--color-primary);
}

.page-hero__tag {
  color: var(--color-primary);
  font-weight: 700;
  text-transform: uppercase;
  font-size: var(--font-size-xs);
  letter-spacing: 0.08em;
  margin-bottom: var(--space-xs);
}

.page-hero__title {
  color: var(--color-dark-text);
  font-size: var(--font-size-3xl);
  margin-bottom: var(--space-md);
}

.page-hero__desc {
  color: var(--color-dark-muted);
  font-size: var(--font-size-md);
  max-width: 800px;
}

/* Corporate Timeline Component (About Page) */
.timeline {
  position: relative;
  max-width: 900px;
  margin-inline: auto;
  padding-left: var(--space-xl);
}

.timeline::before {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: 6px;
  width: 3px;
  background-color: var(--color-primary);
}

.timeline-item {
  position: relative;
  margin-bottom: var(--space-2xl);
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: calc(-1 * var(--space-xl) + 1px);
  top: 6px;
  width: 14px;
  height: 14px;
  border-radius: var(--border-radius-full);
  background-color: var(--color-surface);
  border: 3px solid var(--color-primary);
}

.timeline-item__year {
  font-family: var(--font-display);
  font-size: var(--font-size-lg);
  font-weight: 800;
  color: var(--color-primary);
  margin-bottom: 4px;
}

.timeline-item__title {
  font-size: var(--font-size-md);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-2xs);
}

.timeline-item__desc {
  font-size: var(--font-size-sm);
  color: var(--color-muted);
  margin: 0;
}

/* Leadership Team Grid (About Page) */
.team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
}

@media (min-width: 640px) {
  .team-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .team-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.team-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-md);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.team-card__media {
  aspect-ratio: 1 / 1;
  overflow: hidden;
  background-color: var(--color-dark);
}

.team-card__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-fast);
}

.team-card:hover .team-card__img {
  transform: scale(1.03);
}

.team-card__content {
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.team-card__name {
  font-size: var(--font-size-md);
  font-weight: 700;
  margin-bottom: 2px;
}

.team-card__role {
  font-size: var(--font-size-xs);
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: var(--space-xs);
}

.team-card__bio {
  font-size: var(--font-size-xs);
  color: var(--color-muted);
  margin: 0;
}

/* Filter Bar Component (Projects Page) */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-bottom: var(--space-2xl);
  justify-content: center;
}

.filter-btn {
  padding: 0.55rem 1rem;
  border-radius: var(--border-radius-full);
  border: 1px solid var(--color-border);
  background-color: var(--color-surface);
  font-size: var(--font-size-xs);
  font-weight: 700;
  color: var(--color-text);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.filter-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.filter-btn.is-active {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-primary-text);
}

/* Office Hub Full Cards (Contact Page) */
.office-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
}

@media (min-width: 768px) {
  .office-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .office-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.office-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
}

.office-card--hq {
  border: 2px solid var(--color-primary);
  position: relative;
}

.office-card__badge {
  position: absolute;
  top: var(--space-md);
  right: var(--space-md);
  z-index: 2;
}

.office-card__media {
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background-color: var(--color-dark);
}

.office-card__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.office-card__content {
  padding: var(--space-xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  flex-grow: 1;
}

.office-card__title {
  font-size: var(--font-size-lg);
  font-weight: 800;
  margin-bottom: 2px;
}

.office-card__address {
  font-size: var(--font-size-sm);
  color: var(--color-muted);
  line-height: 1.5;
}

.office-card__contact-row {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-top: var(--space-sm);
  border-top: 1px solid var(--color-border-subtle);
  font-size: var(--font-size-sm);
}

.office-card__contact-row a {
  color: var(--color-text);
  font-weight: 600;
  text-decoration: none;
}

.office-card__contact-row a:hover {
  color: var(--color-primary);
  text-decoration: underline;
}

/* --------------------------------------------------------------------------
   21. Motion & Progressive Enhancement
   Wrap inside prefers-reduced-motion: no-preference
   Content stays 100% visible if JS disabled or prefers-reduced-motion is on
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion: no-preference) {
  .reveal-on-scroll {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1), transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
  }

  .reveal-on-scroll.is-revealed {
    opacity: 1;
    transform: translateY(0);
  }
}