/* =====================================================
   MB GROUP — SITE STYLESHEET
   Structure:
   1. Design tokens
   2. Reset & base
   3. Utilities (container, buttons, sections)
   4. Header & navigation
   5. Footer
   6. Home page
   7. Page hero (about/services/projects/contact)
   8. About page (sticky sections, icon grid, offer grid)
   9. Services page (large cards)
   10. Modal / popup
   11. Projects page (gallery + lightbox)
   12. Contact page
   13. Scroll-reveal animation
   14. Responsive
   15. Back-to-top & misc utilities
   ===================================================== */

/* ---------- 1. DESIGN TOKENS ---------- */
:root {
  --color-primary: #0A66C2;
  --color-primary-dark: #085299;
  --color-accent: #1D4ED8;
  --color-bg: #FFFFFF;
  --color-bg-light: #F7F9FB;
  --color-text: #1F2937;
  --color-text-muted: #6B7280;
  --color-border: #E5E7EB;
  --color-footer-bg: #111827;
  --color-footer-text: #9CA3AF;

  --font-heading: 'Poppins', sans-serif;
  --font-body: 'Inter', sans-serif;

  --nav-height: 80px;
  --container-width: 1200px;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 24px;
  --radius-full: 999px;

  --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.07);
  --shadow-md: 0 10px 28px rgba(15, 23, 42, 0.10);
  --shadow-lg: 0 24px 56px rgba(15, 23, 42, 0.16);

  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2rem;
  --space-5: 3rem;
  --space-6: 4.5rem;
  --space-7: 6rem;

  --transition: 0.25s ease;
}

/* ---------- 2. RESET & BASE ---------- */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body, h1, h2, h3, h4, p, ul, figure { margin: 0; }
ul { padding: 0; list-style: none; }
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; }

body {
  font-family: var(--font-body);
  color: var(--color-text);
  line-height: 1.65;
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-text);
}

h1 { font-size: clamp(2.1rem, 1.4rem + 2.6vw, 3.4rem); }
h2 { font-size: clamp(1.7rem, 1.3rem + 1.6vw, 2.4rem); }
h3 { font-size: 1.2rem; }

p { color: var(--color-text); }
p.lead { font-size: 1.125rem; color: var(--color-text-muted); }

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

/* ---------- 3. UTILITIES ---------- */
.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section { padding: var(--space-7) 0; }
.section-alt { background: var(--color-bg-light); }

.eyebrow {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: 0.75rem;
}

.section-head {
  max-width: 640px;
  margin: 0 auto var(--space-5);
  text-align: center;
}
.section-head p { color: var(--color-text-muted); margin-top: 0.75rem; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 1.75rem;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 0.95rem;
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition), color var(--transition);
  white-space: nowrap;
}
.btn-primary {
  background: var(--color-primary);
  color: #fff;
}
.btn-primary:hover {
  background: var(--color-accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}
.btn-outline {
  background: transparent;
  border-color: var(--color-primary);
  color: var(--color-primary);
}
.btn-outline:hover {
  background: var(--color-primary);
  color: #fff;
  transform: translateY(-2px);
}
.btn-white {
  background: #fff;
  color: var(--color-primary);
}
.btn-white:hover {
  background: var(--color-bg-light);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}
.btn-sm { padding: 0.6rem 1.25rem; font-size: 0.85rem; }

.icon-box {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-sm);
  background: rgba(10, 102, 194, 0.1);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.icon-box svg { width: 26px; height: 26px; }

.learn-more {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--color-primary);
  font-weight: 600;
  font-size: 0.95rem;
  transition: gap var(--transition);
}
.learn-more svg { width: 16px; height: 16px; transition: transform var(--transition); }
.learn-more:hover svg { transform: translateX(4px); }

/* ---------- 4. HEADER & NAVIGATION ---------- */
.site-header {
  position: sticky;
  top: 0;
  height: var(--nav-height);
  width: 100%;
  background: #fff;
  z-index: 1000;
  transition: box-shadow var(--transition);
}
.site-header.scrolled { box-shadow: var(--shadow-sm); }

.nav-container {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.15rem;
}
.logo-mark {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.95rem;
  flex-shrink: 0;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2.25rem;
}
.nav-links a {
  position: relative;
  font-weight: 500;
  font-size: 0.95rem;
  padding: 0.35rem 0;
}
.nav-links a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: width var(--transition);
}
.nav-links a:hover::after,
.nav-links a.active::after { width: 100%; }

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.lang-toggle {
  border: 1px solid var(--color-border);
  background: transparent;
  border-radius: var(--radius-full);
  padding: 0.4rem 0.9rem;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-text);
  cursor: pointer;
  transition: border-color var(--transition), color var(--transition);
}
.lang-toggle:hover { border-color: var(--color-primary); color: var(--color-primary); }

.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: none;
  border: none;
  cursor: pointer;
}
.hamburger span {
  width: 24px;
  height: 2px;
  background: var(--color-text);
  transition: transform var(--transition), opacity var(--transition);
}
.hamburger.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- 5. FOOTER ---------- */
.site-footer { background: var(--color-footer-bg); color: var(--color-footer-text); }
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 2.5rem;
  padding: var(--space-6) 0 var(--space-4);
}
.footer-col .logo { color: #fff; margin-bottom: 1rem; }
.footer-col p { color: var(--color-footer-text); font-size: 0.9rem; }
.footer-col h4 { color: #fff; font-size: 0.95rem; margin-bottom: 1.1rem; }
.footer-col ul li { margin-bottom: 0.65rem; }
.footer-col a { color: var(--color-footer-text); font-size: 0.9rem; transition: color var(--transition); }
.footer-col a:hover { color: #fff; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding: 1.5rem 0;
  text-align: center;
  font-size: 0.8rem;
  color: #6B7280;
}

/* ---------- 6. HOME PAGE ---------- */
.hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--nav-height) + var(--space-6)) 0 var(--space-6);
}
.hero::before {
  content: '';
  position: absolute;
  top: -120px;
  right: -120px;
  width: 420px;
  height: 420px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(10,102,194,0.12), transparent 70%);
  pointer-events: none;
}
.hero-inner {
  position: relative;
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: var(--space-5);
  align-items: center;
}
.hero h1 { margin-bottom: 1.25rem; }
.hero p.lead { max-width: 460px; margin-bottom: 2rem; }
.hero-actions { display: flex; gap: 1rem; flex-wrap: wrap; }
.hero-media img {
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  width: 100%;
}

.feature-cards { margin-top: -3rem; position: relative; z-index: 2; }
.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}
.feature-card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
}
.feature-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); }
.feature-card .icon-box { margin-bottom: 1.25rem; }
.feature-card h3 { margin-bottom: 0.5rem; }
.feature-card p { color: var(--color-text-muted); font-size: 0.95rem; }

.why-split-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-5);
  align-items: center;
}
.why-media img { border-radius: var(--radius-lg); box-shadow: var(--shadow-md); }
.why-content h2 { margin-bottom: 1rem; }
.why-content p { color: var(--color-text-muted); margin-bottom: 1.5rem; }

.service-strip { padding: var(--space-5) 0; }
.service-strip.bg-light { background: var(--color-bg-light); }
.service-strip-inner {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 2rem;
  align-items: center;
}
.service-strip h3 { margin-bottom: 0.5rem; }
.service-strip p { color: var(--color-text-muted); max-width: 480px; }

.cta-banner {
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  color: #fff;
  text-align: center;
  padding: var(--space-6) 0;
}
.cta-banner h2 { color: #fff; margin-bottom: 1rem; }
.cta-banner p { color: rgba(255,255,255,0.85); max-width: 480px; margin: 0 auto 2rem; }

/* ---------- 7. PAGE HERO (about / services / projects / contact) ---------- */
.page-hero {
  background: var(--color-bg-light);
  text-align: center;
  padding: calc(var(--nav-height) + var(--space-5)) 0 var(--space-5);
}
.page-hero p { color: var(--color-text-muted); max-width: 560px; margin: 0.75rem auto 0; }

/* ---------- 8. ABOUT PAGE ---------- */
.sticky-section { padding: var(--space-7) 0; }
.sticky-section .container {
  display: grid;
  grid-template-columns: 0.9fr 1.4fr;
  gap: var(--space-5);
  align-items: start;
}
.sticky-title-col {
  position: sticky;
  top: calc(var(--nav-height) + 2rem);
  align-self: start;
}
.sticky-title-col h2 { margin-bottom: 0.75rem; }
.sticky-title-col p { color: var(--color-text-muted); }
.sticky-content-col { display: flex; flex-direction: column; gap: 2.5rem; }
.sticky-content-col img { border-radius: var(--radius-lg); box-shadow: var(--shadow-md); }

.icon-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
}
.icon-grid-item {
  background: #fff;
  padding: 1.75rem;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}
.icon-grid-item .icon-box { margin-bottom: 1.1rem; }
.icon-grid-item h4 { margin-bottom: 0.4rem; font-family: var(--font-heading); }
.icon-grid-item p { color: var(--color-text-muted); font-size: 0.9rem; }

.offer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
}
.offer-card {
  cursor: pointer;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 2rem;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}
.offer-card:hover { border-color: var(--color-primary); box-shadow: var(--shadow-md); transform: translateY(-4px); }
.offer-card .icon-box { margin-bottom: 1.1rem; }
.offer-card h4 { font-family: var(--font-heading); margin-bottom: 0.5rem; }
.offer-card p { color: var(--color-text-muted); font-size: 0.9rem; margin-bottom: 1rem; }

/* ---------- 9. SERVICES PAGE ---------- */
.service-cards-lg {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}
.service-card-lg {
  position: relative;
  min-height: 500px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  cursor: pointer;
  display: flex;
  align-items: flex-end;
}
.service-card-lg img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.service-card-lg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(15,23,42,0.88), rgba(15,23,42,0.15) 65%);
}
.service-card-lg:hover img { transform: scale(1.06); }
.service-card-lg-content { position: relative; z-index: 2; padding: 2.5rem; }
.service-card-lg-content .eyebrow { color: #93C5FD; }
.service-card-lg-content h3 { color: #fff; font-size: 1.6rem; margin-bottom: 0.6rem; }
.service-card-lg-content p { color: rgba(255,255,255,0.85); max-width: 320px; margin-bottom: 1.25rem; font-size: 0.95rem; }

/* ---------- 10. MODAL / POPUP ---------- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  z-index: 2000;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition), visibility var(--transition);
}
.modal-overlay.active { opacity: 1; visibility: visible; }
.modal-box {
  background: #fff;
  border-radius: var(--radius-lg);
  max-width: 560px;
  width: 100%;
  max-height: 85vh;
  overflow-y: auto;
  padding: 2.5rem;
  position: relative;
  box-shadow: var(--shadow-lg);
  transform: scale(0.94) translateY(12px);
  transition: transform var(--transition);
}
.modal-overlay.active .modal-box { transform: scale(1) translateY(0); }
.modal-close {
  position: absolute;
  top: 1.25rem;
  right: 1.25rem;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: none;
  background: var(--color-bg-light);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition);
}
.modal-close:hover { background: var(--color-border); }
.modal-box .eyebrow { display: block; }
.modal-box h3 { padding-right: 2rem; margin-bottom: 0.9rem; }
.modal-box p { color: var(--color-text-muted); }
.modal-list { margin: 1.4rem 0; display: flex; flex-direction: column; gap: 0.65rem; }
.modal-list li {
  padding-left: 1.6rem;
  position: relative;
  color: var(--color-text);
  font-size: 0.95rem;
}
.modal-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.5rem;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--color-primary);
}

/* ---------- 11. PROJECTS PAGE ---------- */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}
.gallery-item {
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  cursor: pointer;
  aspect-ratio: 4 / 3;
}
.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.45s ease;
}
.gallery-item:hover img { transform: scale(1.08); }
.gallery-overlay {
  position: absolute;
  inset: 0;
  background: rgba(10, 102, 194, 0);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--transition), background var(--transition);
}
.gallery-item:hover .gallery-overlay { opacity: 1; background: rgba(10, 102, 194, 0.55); }
.gallery-overlay svg { width: 34px; height: 34px; color: #fff; }
.gallery-caption {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  padding: 0.75rem 1rem;
  background: linear-gradient(to top, rgba(15,23,42,0.75), transparent);
  color: #fff;
  font-size: 0.85rem;
  font-weight: 500;
}

.lightbox-overlay {
  position: fixed;
  inset: 0;
  background: rgba(10, 12, 20, 0.92);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2100;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition), visibility var(--transition);
  padding: 1.5rem;
}
.lightbox-overlay.active { opacity: 1; visibility: visible; }
.lightbox-content { position: relative; max-width: 880px; width: 100%; }
.lightbox-content img {
  width: 100%;
  max-height: 72vh;
  object-fit: contain;
  border-radius: var(--radius-md);
  background: #000;
}
.lightbox-caption { color: #fff; text-align: center; margin-top: 1.1rem; font-size: 0.95rem; opacity: 0.85; }
.lightbox-close {
  position: absolute;
  top: -3.25rem;
  right: 0;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: none;
  background: rgba(255,255,255,0.12);
  color: #fff;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition);
}
.lightbox-close:hover { background: rgba(255,255,255,0.25); }
.lightbox-prev, .lightbox-next {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 46px;
  height: 46px;
  border-radius: 50%;
  border: none;
  background: rgba(255,255,255,0.12);
  color: #fff;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition);
}
.lightbox-prev:hover, .lightbox-next:hover { background: rgba(255,255,255,0.25); }
.lightbox-prev { left: -64px; }
.lightbox-next { right: -64px; }

/* ---------- 12. CONTACT PAGE ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: var(--space-5);
  align-items: start;
}
.contact-lead { color: var(--color-text-muted); margin: 0.75rem 0 2rem; }
.contact-info-item { display: flex; gap: 1rem; margin-bottom: 1.85rem; }
.contact-info-item h4 { margin-bottom: 0.3rem; font-family: var(--font-heading); }
.contact-info-item p { color: var(--color-text-muted); }
.contact-info-item a { color: var(--color-text); transition: color var(--transition); }
.contact-info-item a:hover { color: var(--color-primary); }

.contact-form {
  background: var(--color-bg-light);
  padding: 2.5rem;
  border-radius: var(--radius-lg);
}
.form-group { margin-bottom: 1.25rem; }
.form-group label {
  display: block;
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 0.4rem;
}
.form-group input, .form-group textarea {
  width: 100%;
  padding: 0.8rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 1rem;
  background: #fff;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.form-group input:focus, .form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(10, 102, 194, 0.15);
}
.form-note { font-size: 0.8rem; color: var(--color-text-muted); margin-top: 1rem; }

/* ---------- 13. SCROLL-REVEAL ANIMATION ---------- */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.active { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .feature-card, .offer-card, .service-card-lg img, .gallery-item img { transition: none; }
}

/* ---------- 14. RESPONSIVE ---------- */
@media (max-width: 900px) {
  .nav-links {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: #fff;
    flex-direction: column;
    align-items: flex-start;
    gap: 1.25rem;
    padding: 1.75rem 1.5rem;
    box-shadow: var(--shadow-md);
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition), transform var(--transition), visibility var(--transition);
  }
  .nav-links.mobile-open { transform: none; opacity: 1; visibility: visible; }
  .hamburger { display: flex; }

  .hero-inner { grid-template-columns: 1fr; text-align: center; }
  .hero p.lead { margin-left: auto; margin-right: auto; }
  .hero-actions { justify-content: center; }
  .hero-media { order: -1; margin-bottom: 1.5rem; }
  .card-grid { grid-template-columns: repeat(2, 1fr); }
  .why-split-inner { grid-template-columns: 1fr; }
  .why-media { order: -1; }
  .service-strip-inner { grid-template-columns: 1fr; text-align: center; gap: 1rem; }

  .sticky-section .container { grid-template-columns: 1fr; }
  .sticky-title-col { position: static; margin-bottom: 1.5rem; }

  .service-cards-lg { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .gallery-grid { grid-template-columns: repeat(2, 1fr); }

  .lightbox-prev { left: 0.5rem; }
  .lightbox-next { right: 0.5rem; }
  .lightbox-close { top: 0.5rem; right: 0.5rem; }
}

@media (max-width: 620px) {
  .card-grid { grid-template-columns: 1fr; }
  .gallery-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr; text-align: center; }
  .footer-col .logo { justify-content: center; }
  .contact-form { padding: 1.75rem; }
  .modal-box { padding: 1.75rem; }
  .service-card-lg { min-height: 400px; }
}

@media (max-width: 420px) {
  .gallery-grid { grid-template-columns: 1fr; }
}

/* ---------- 15. BACK-TO-TOP & MISC UTILITIES ---------- */

/* Visually hidden but still available to screen readers */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Fixed circular button that scrolls back up to the header.
   Used on longer pages (contact, projects). Reuses the same
   [data-scroll-target] click handler already defined in main.js. */
.back-to-top {
  position: fixed;
  right: 1.5rem;
  bottom: 1.5rem;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: none;
  background: var(--color-primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: var(--shadow-md);
  z-index: 900;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
}
.back-to-top:hover {
  background: var(--color-accent);
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}
.back-to-top svg { width: 20px; height: 20px; }

/* Embedded map on the contact page */
.contact-map-label { margin-bottom: 0.6rem; }
.contact-map {
  margin-top: 0.5rem;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  aspect-ratio: 4 / 3;
}
.contact-map iframe {
  width: 100%;
  height: 100%;
  border: 0;
  display: block;
}

@media (max-width: 620px) {
  .back-to-top { right: 1rem; bottom: 1rem; width: 44px; height: 44px; }
}