/* ==========================================================================
   Nordic Groundworks AB — Design tokens & base
   ========================================================================== */
@import url('https://fonts.googleapis.com/css2?family=Bebas+Neue&family=Source+Sans+3:wght@400;500;600;700;800&display=swap');

:root {
  /* Brand colors */
  --color-navy-900: #0a1626;
  --color-navy-800: #0f2038;
  --color-navy-700: #163356;
  --color-navy-600: #1f4470;
  --color-red-600: #c81f2f;
  --color-red-700: #9e1620;

  /* Semantic tokens */
  --color-primary: var(--color-navy-800);
  --color-primary-dark: var(--color-navy-900);
  --color-accent: var(--color-red-600);
  --color-accent-dark: var(--color-red-700);
  --color-bg: #ffffff;
  --color-bg-alt: #f3f5f8;
  --color-surface: #ffffff;
  --color-text: #16202e;
  --color-text-muted: #55606f;
  --color-text-on-primary: #ffffff;
  --color-border: #e1e5eb;
  --color-border-dark: rgba(255, 255, 255, 0.14);

  /* Typography */
  --font-display: 'Bebas Neue', sans-serif;
  --font-body: 'Source Sans 3', -apple-system, BlinkMacSystemFont, sans-serif;

  /* Spacing scale (4/8pt) */
  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2rem;
  --space-5: 3rem;
  --space-6: 4rem;
  --space-7: 6rem;
  --space-8: 8rem;

  /* Layout */
  --container-width: 1200px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 3px rgba(10, 22, 38, 0.08), 0 1px 2px rgba(10, 22, 38, 0.06);
  --shadow-md: 0 8px 24px rgba(10, 22, 38, 0.12);
  --shadow-lg: 0 20px 48px rgba(10, 22, 38, 0.18);

  /* Motion */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --duration-fast: 150ms;
  --duration-base: 250ms;
}

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

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

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

body {
  margin: 0;
  min-height: 100dvh;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
}

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

h1, h2, h3, h4 {
  font-family: var(--font-display);
  letter-spacing: 0.01em;
  line-height: 1.05;
  margin: 0 0 var(--space-2);
  color: var(--color-primary);
}

h1 { font-size: clamp(2.5rem, 6vw, 4.25rem); }
h2 { font-size: clamp(2rem, 4.4vw, 3rem); }
h3 { font-size: clamp(1.4rem, 2.6vw, 1.9rem); }
h4 { font-size: 1.2rem; letter-spacing: 0.02em; }

p { margin: 0 0 var(--space-2); max-width: 68ch; }
p:last-child { margin-bottom: 0; }

a { color: var(--color-accent); text-decoration-thickness: 1.5px; }
a:hover { color: var(--color-accent-dark); }

a, button, input, textarea, select {
  font-family: inherit;
}

button { cursor: pointer; }

:focus-visible {
  outline: 3px solid var(--color-red-600);
  outline-offset: 2px;
  border-radius: 4px;
}

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

.skip-link {
  position: absolute;
  left: var(--space-2);
  top: -60px;
  background: var(--color-accent);
  color: #fff;
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-sm);
  z-index: 1000;
  transition: top var(--duration-base) var(--ease-out);
  font-weight: 600;
}
.skip-link:focus { top: var(--space-2); }

.container {
  width: 100%;
  max-width: var(--container-width);
  margin-inline: auto;
  padding-inline: var(--space-3);
}

@media (min-width: 768px) {
  .container { padding-inline: var(--space-4); }
}

section { padding-block: var(--space-6); }
@media (max-width: 767px) {
  section { padding-block: var(--space-5); }
}

.section-alt { background: var(--color-bg-alt); }
.section-dark {
  background: var(--color-primary-dark);
  color: rgba(255, 255, 255, 0.92);
}
.section-dark h2, .section-dark h3, .section-dark h4 { color: #fff; }
.section-dark p { color: rgba(255, 255, 255, 0.78); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-1);
}
.eyebrow::before {
  content: "";
  width: 28px;
  height: 3px;
  background: var(--color-accent);
  border-radius: 2px;
}

.section-head {
  max-width: 46rem;
  margin-bottom: var(--space-5);
}
.section-head.center { margin-inline: auto; text-align: center; }
.section-head p { color: var(--color-text-muted); font-size: 1.05rem; }
.section-dark .section-head p { color: rgba(255,255,255,0.75); }

/* ==========================================================================
   Buttons
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  min-height: 48px;
  padding: 0.85rem 1.6rem;
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 1rem;
  text-decoration: none;
  border: 2px solid transparent;
  transition: background var(--duration-base) var(--ease-out),
              color var(--duration-base) var(--ease-out),
              border-color var(--duration-base) var(--ease-out),
              transform var(--duration-fast) var(--ease-out);
  touch-action: manipulation;
}
.btn:active { transform: scale(0.97); }

.btn-primary {
  background: var(--color-accent);
  color: #fff;
}
.btn-primary:hover { background: var(--color-accent-dark); color: #fff; }

.btn-outline {
  background: transparent;
  border-color: currentColor;
  color: #fff;
}
.btn-outline:hover { background: rgba(255,255,255,0.12); color: #fff; }

.btn-light {
  background: #fff;
  color: var(--color-primary);
}
.btn-light:hover { background: #eef1f5; color: var(--color-primary); }

.btn-ghost {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-border);
}
.btn-ghost:hover { background: var(--color-bg-alt); }

.btn-block { width: 100%; }

.btn-group {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

/* ==========================================================================
   Header / Navigation
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-primary-dark);
  border-bottom: 1px solid var(--color-border-dark);
}

.nav-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding-block: 0.6rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  min-height: 44px;
}
.brand img {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-sm);
  object-fit: contain;
  background: var(--color-navy-900);
  flex-shrink: 0;
}
.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}
.brand-text strong {
  font-family: var(--font-display);
  font-size: 1.4rem;
  color: #fff;
  letter-spacing: 0.03em;
}
.brand-text span {
  font-size: 0.68rem;
  color: var(--color-red-600);
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav-links a {
  color: rgba(255,255,255,0.85);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.98rem;
  padding: 0.5rem 0.1rem;
  position: relative;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}
.nav-links a:hover { color: #fff; }
.nav-links a[aria-current="page"] { color: #fff; }
.nav-links a[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 0.35rem;
  height: 2px;
  background: var(--color-red-600);
  border-radius: 2px;
}

.nav-cta { display: flex; align-items: center; gap: var(--space-2); }
.nav-phone {
  display: none;
  align-items: center;
  gap: 0.5rem;
  color: #fff;
  font-weight: 700;
  text-decoration: none;
  white-space: nowrap;
}
.nav-phone svg { flex-shrink: 0; }

.nav-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: transparent;
  border: none;
  color: #fff;
  border-radius: var(--radius-sm);
}
.nav-toggle:hover { background: rgba(255,255,255,0.1); }

@media (max-width: 899px) {
  .nav-links {
    position: fixed;
    inset: 0 0 0 auto;
    top: 0;
    height: 100dvh;
    width: min(320px, 84vw);
    background: var(--color-primary-dark);
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-start;
    padding: 6rem var(--space-3) var(--space-3);
    gap: var(--space-2);
    transform: translateX(100%);
    transition: transform var(--duration-base) var(--ease-out);
    box-shadow: var(--shadow-lg);
  }
  .nav-links.is-open { transform: translateX(0); }
  .nav-links a { font-size: 1.2rem; width: 100%; }
  .nav-links .btn { width: 100%; margin-top: var(--space-2); }
}

@media (min-width: 900px) {
  .nav-toggle { display: none; }
  .nav-phone { display: inline-flex; }
}

.nav-scrim {
  position: fixed;
  inset: 0;
  background: rgba(6, 12, 22, 0.55);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--duration-base) var(--ease-out);
  z-index: 90;
}
.nav-scrim.is-visible { opacity: 1; pointer-events: auto; }

/* ==========================================================================
   Hero
   ========================================================================== */
.hero {
  position: relative;
  color: #fff;
  min-height: min(88vh, 760px);
  display: flex;
  align-items: center;
  overflow: hidden;
}
.hero picture, .hero img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 65%;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(100deg, rgba(10,22,38,0.94) 15%, rgba(10,22,38,0.72) 48%, rgba(10,22,38,0.42) 78%);
}
.hero-content {
  position: relative;
  z-index: 1;
  max-width: 640px;
  padding-block: var(--space-6);
}
.hero-content .eyebrow { color: var(--color-red-600); }
.hero-content h1 { color: #fff; margin-bottom: var(--space-2); }
.hero-content p {
  font-size: 1.15rem;
  color: rgba(255,255,255,0.88);
  margin-bottom: var(--space-3);
  max-width: 54ch;
}

.page-banner {
  position: relative;
  color: #fff;
  background: var(--color-primary-dark);
  padding-block: var(--space-6);
}
.page-banner .container { position: relative; z-index: 1; }
.page-banner h1 { color: #fff; }
.page-banner p { color: rgba(255,255,255,0.78); font-size: 1.1rem; }
.breadcrumb {
  display: flex;
  gap: 0.5rem;
  list-style: none;
  padding: 0; margin: 0 0 var(--space-2);
  font-size: 0.9rem;
  color: rgba(255,255,255,0.6);
}
.breadcrumb a { color: rgba(255,255,255,0.75); text-decoration: none; }
.breadcrumb a:hover { color: #fff; }
.breadcrumb li:not(:last-child)::after { content: "/"; margin-left: 0.5rem; }

/* ==========================================================================
   Trust bar
   ========================================================================== */
.trust-bar {
  background: var(--color-bg-alt);
  border-bottom: 1px solid var(--color-border);
}
.trust-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-3);
  padding-block: var(--space-3);
}
@media (min-width: 700px) {
  .trust-grid { grid-template-columns: repeat(4, 1fr); }
}
.trust-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.trust-item svg {
  flex-shrink: 0;
  color: var(--color-accent);
}
.trust-item strong {
  display: block;
  font-size: 0.98rem;
  color: var(--color-primary);
}
.trust-item span {
  display: block;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

/* ==========================================================================
   Cards / Services grid
   ========================================================================== */
.card-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
}
@media (min-width: 640px) {
  .card-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 1024px) {
  .card-grid.cols-4 { grid-template-columns: repeat(4, 1fr); }
}

.service-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-3);
  transition: transform var(--duration-base) var(--ease-out), box-shadow var(--duration-base) var(--ease-out), border-color var(--duration-base) var(--ease-out);
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.service-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-navy-600);
}
.service-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-sm);
  background: var(--color-navy-800);
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.service-card h3 { font-size: 1.3rem; margin-bottom: 0.25rem; }
.service-card p { color: var(--color-text-muted); font-size: 0.98rem; }
.service-card .card-link {
  margin-top: auto;
  font-weight: 700;
  font-size: 0.92rem;
  color: var(--color-accent);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  text-decoration: none;
}
.service-card .card-link svg { transition: transform var(--duration-fast) var(--ease-out); }
.service-card:hover .card-link svg { transform: translateX(3px); }

/* ==========================================================================
   About split
   ========================================================================== */
.split {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
  align-items: center;
}
@media (min-width: 900px) {
  .split { grid-template-columns: 1fr 1fr; gap: var(--space-6); }
  .split.reverse .split-media { order: 2; }
}
.split-media img {
  border-radius: var(--radius-lg);
  aspect-ratio: 4 / 3;
  object-fit: cover;
  width: 100%;
  height: auto;
  box-shadow: var(--shadow-md);
}
.split-body ul {
  list-style: none;
  margin: var(--space-2) 0 0;
  padding: 0;
  display: grid;
  gap: 0.65rem;
}
.split-body li {
  display: flex;
  align-items: flex-start;
  gap: 0.65rem;
  color: var(--color-text);
  font-weight: 600;
}
.split-body li svg { color: var(--color-accent); flex-shrink: 0; margin-top: 0.15rem; }

/* ==========================================================================
   Service detail sections (Tjänster page)
   ========================================================================== */
.service-detail { scroll-margin-top: 96px; }
.service-detail:not(:last-child) {
  border-bottom: 1px solid var(--color-border);
}
.service-detail .split-media {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2);
}
.service-detail .split-media img {
  aspect-ratio: 3 / 4;
}
.service-number {
  font-family: var(--font-display);
  font-size: 3.5rem;
  color: var(--color-border);
  line-height: 1;
  margin-bottom: 0.25rem;
  -webkit-text-stroke: 2px var(--color-navy-600);
  color: transparent;
}
.service-detail .btn { margin-top: var(--space-2); }

/* ==========================================================================
   Gallery
   ========================================================================== */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-2);
}
@media (min-width: 700px) {
  .gallery-grid { grid-template-columns: repeat(3, 1fr); }
}
@media (min-width: 1024px) {
  .gallery-grid { grid-template-columns: repeat(4, 1fr); }
}
.gallery-item {
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  aspect-ratio: 4 / 3;
  background: var(--color-bg-alt);
}
.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 400ms var(--ease-out);
}
.gallery-item:hover img { transform: scale(1.06); }
.gallery-item figcaption {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  padding: 0.6rem 0.75rem;
  background: linear-gradient(0deg, rgba(10,22,38,0.85), rgba(10,22,38,0));
  color: #fff;
  font-size: 0.82rem;
  font-weight: 600;
  opacity: 0;
  transform: translateY(6px);
  transition: opacity var(--duration-base) var(--ease-out), transform var(--duration-base) var(--ease-out);
}
.gallery-item:hover figcaption,
.gallery-item:focus-within figcaption { opacity: 1; transform: translateY(0); }

/* ==========================================================================
   Steps / process
   ========================================================================== */
.steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
  counter-reset: step;
}
@media (min-width: 700px) {
  .steps { grid-template-columns: repeat(4, 1fr); }
}
.step {
  position: relative;
  padding: var(--space-3);
  background: #fff;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}
.step-number {
  width: 40px; height: 40px;
  border-radius: 50%;
  background: var(--color-accent);
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 1.3rem;
  margin-bottom: var(--space-2);
}
.step h4 { margin-bottom: 0.4rem; }
.step p { color: var(--color-text-muted); font-size: 0.95rem; }

/* ==========================================================================
   CTA banner
   ========================================================================== */
.cta-banner {
  background: linear-gradient(120deg, var(--color-navy-900), var(--color-navy-700));
  color: #fff;
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
}
.cta-banner h2 { color: #fff; margin-bottom: 0.35rem; }
.cta-banner p { color: rgba(255,255,255,0.8); margin-bottom: 0; }
.cta-banner .btn-group { flex-shrink: 0; }

/* ==========================================================================
   Contact page
   ========================================================================== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}
@media (min-width: 960px) {
  .contact-grid { grid-template-columns: 0.85fr 1.15fr; gap: var(--space-6); }
}
.contact-cards {
  display: grid;
  gap: var(--space-2);
}
.contact-card {
  display: flex;
  gap: var(--space-2);
  align-items: flex-start;
  padding: var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: #fff;
  text-decoration: none;
  color: inherit;
  transition: border-color var(--duration-base) var(--ease-out), box-shadow var(--duration-base) var(--ease-out);
}
a.contact-card:hover { border-color: var(--color-navy-600); box-shadow: var(--shadow-sm); }
.contact-card .service-icon { width: 48px; height: 48px; }
.contact-card h3 { font-size: 1.05rem; margin-bottom: 0.15rem; }
.contact-card p { color: var(--color-text-muted); font-size: 0.95rem; }

.form-card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  box-shadow: var(--shadow-sm);
}
.form-row { display: grid; gap: var(--space-2); margin-bottom: var(--space-2); }
@media (min-width: 560px) {
  .form-row.two-col { grid-template-columns: 1fr 1fr; }
}
.field label {
  display: block;
  font-weight: 700;
  font-size: 0.92rem;
  color: var(--color-primary);
  margin-bottom: 0.35rem;
}
.field .required { color: var(--color-accent); }
.field input,
.field select,
.field textarea {
  width: 100%;
  min-height: 48px;
  padding: 0.7rem 0.9rem;
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--color-border);
  background: #fff;
  color: var(--color-text);
  font-size: 1rem;
  transition: border-color var(--duration-fast) var(--ease-out), box-shadow var(--duration-fast) var(--ease-out);
}
.field textarea { min-height: 140px; resize: vertical; }
.field input:focus,
.field select:focus,
.field textarea:focus {
  outline: none;
  border-color: var(--color-navy-600);
  box-shadow: 0 0 0 3px rgba(31, 68, 112, 0.18);
}
.field-hint {
  font-size: 0.82rem;
  color: var(--color-text-muted);
  margin-top: 0.3rem;
}
.field-error {
  font-size: 0.85rem;
  color: var(--color-accent-dark);
  margin-top: 0.35rem;
  display: none;
  font-weight: 600;
}
.field.has-error input,
.field.has-error textarea,
.field.has-error select { border-color: var(--color-accent-dark); }
.field.has-error .field-error { display: block; }

.form-status {
  margin-top: var(--space-2);
  padding: 0.85rem 1rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  display: none;
}
.form-status.is-visible { display: block; }
.form-status.success { background: #e7f5ec; color: #1c6b3a; }
.form-status.error { background: #fbeaec; color: var(--color-accent-dark); }

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  background: var(--color-primary-dark);
  color: rgba(255,255,255,0.72);
  padding-block: var(--space-6) var(--space-4);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--color-border-dark);
}
@media (min-width: 700px) {
  .footer-grid { grid-template-columns: 1.3fr 1fr 1fr; }
}
.footer-brand { display: flex; gap: 0.75rem; margin-bottom: var(--space-2); }
.footer-brand img { width: 52px; height: 52px; border-radius: var(--radius-sm); object-fit: contain; background: var(--color-navy-900); flex-shrink: 0; }
.footer-brand strong { font-family: var(--font-display); font-size: 1.4rem; color: #fff; letter-spacing: 0.03em; display:block; }
.footer-brand span { font-size: 0.7rem; color: var(--color-red-600); font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; }
.footer-col h4 { color: #fff; font-family: var(--font-body); font-size: 0.85rem; letter-spacing: 0.12em; text-transform: uppercase; margin-bottom: var(--space-2); }
.footer-links { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.6rem; }
.footer-links a { color: rgba(255,255,255,0.72); text-decoration: none; }
.footer-links a:hover { color: #fff; }
.footer-links a.contact-inline { display: inline-flex; align-items: center; gap: 0.5rem; }
.footer-bottom {
  padding-top: var(--space-3);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-2);
  font-size: 0.85rem;
}
.footer-bottom a { color: rgba(255,255,255,0.72); }

/* Back to top */
.back-to-top {
  position: fixed;
  right: var(--space-2);
  bottom: var(--space-2);
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--color-accent);
  color: #fff;
  border: none;
  display: none;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  z-index: 80;
  transition: background var(--duration-fast) var(--ease-out);
}
.back-to-top.is-visible { display: inline-flex; }
.back-to-top:hover { background: var(--color-accent-dark); }

/* Utility */
.mt-0 { margin-top: 0; }
.text-center { text-align: center; }
.no-scroll { overflow: hidden; }