/* ============================================================
   KH DENTASCOPE UK — GLOBAL STYLESHEET
   Edit variables here to update across ALL pages instantly
   ============================================================ */

/* ── GOOGLE FONTS ─────────────────────────────────────────── */
@import url('https://fonts.googleapis.com/css2?family=Sora:wght@400;600;700&family=Inter:wght@300;400;500;600&display=swap');

/* ── DESIGN TOKENS ────────────────────────────────────────── */
:root {
  /* Brand Colours */
  --colour-primary:        #054A80;
  --colour-primary-75:     rgba(5, 74, 128, 0.75);
  --colour-primary-20:     rgba(5, 74, 128, 0.20);
  --colour-secondary:      #41749D;
  --colour-secondary-20:   rgba(65, 116, 157, 0.20);
  --colour-bg-white:       #ffffff;
  --colour-bg-tinted:      rgba(65, 116, 157, 0.10);
  --colour-text-dark:      #0d1b2a;
  --colour-text-mid:       #3a5068;
  --colour-text-light:     #ffffff;
  --colour-border:         rgba(5, 74, 128, 0.15);
  --colour-accent:         #e8f2fb;

  /* Typography */
  --font-heading:          'Sora', sans-serif;
  --font-body:             'Inter', sans-serif;
  --fw-heading:            600;
  --fw-bold:               700;
  --fw-regular:            400;
  --fw-medium:             500;

  /* Spacing */
  --space-xs:   0.5rem;
  --space-sm:   1rem;
  --space-md:   1.5rem;
  --space-lg:   2.5rem;
  --space-xl:   4rem;
  --space-2xl:  6rem;

  /* Layout */
  --container-max:   1200px;
  --container-pad:   1.5rem;
  --nav-height:      72px;
  --border-radius:   10px;
  --border-radius-lg: 20px;
  --shadow-sm:       0 2px 12px rgba(5,74,128,0.08);
  --shadow-md:       0 6px 28px rgba(5,74,128,0.14);
  --shadow-lg:       0 16px 48px rgba(5,74,128,0.18);

  /* Transitions */
  --transition:       0.28s cubic-bezier(0.4,0,0.2,1);
  --transition-fast:  0.16s ease;

  /* ── NAV LABELS (change here → updates everywhere) ──────── */
  --nav-home:            "Home";
  --nav-services:        "Services";
  --nav-products:        "Products";
  --nav-resources:       "Resources";
  --nav-about:           "About";
  --nav-cta:             "Get in Touch";

  /* Services dropdown */
  --nav-s-demos:         "Demos & Room Assessment";
  --nav-s-install:       "Installation & Training";
  --nav-s-servicing:     "Servicing & Aftercare";
  --nav-s-education:     "Education & Institutions";

  /* Products dropdown */
  --nav-p-microscopes:   "Dental Microscopes";
  --nav-p-loupes:        "Dental Loupes";
  --nav-p-ophthalmic:    "Ophthalmic/ENT Microscopes";
  --nav-p-compare:       "Compare Models";

  /* Resources dropdown */
  --nav-r-brochures:     "Brochures & Spec Sheets";
  --nav-r-faqs:          "FAQs";
  --nav-r-guides:        "Guides";
}

/* ── RESET & BASE ─────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-body);
  font-weight: var(--fw-regular);
  color: var(--colour-text-dark);
  background: var(--colour-bg-white);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }

/* ── TYPOGRAPHY ───────────────────────────────────────────── */
h1,h2,h3,h4,h5,h6 {
  font-family: var(--font-heading);
  font-weight: var(--fw-heading);
  line-height: 1.2;
  color: var(--colour-text-dark);
}
h1 { font-size: clamp(2rem, 4.5vw, 3.25rem); }
h2 { font-size: clamp(1.6rem, 3vw, 2.4rem); }
h3 { font-size: clamp(1.15rem, 2vw, 1.5rem); }
h4 { font-size: 1.1rem; }
p  { font-size: clamp(0.93rem, 1.2vw, 1.05rem); color: var(--colour-text-mid); line-height: 1.75; }

/* ── LAYOUT UTILS ─────────────────────────────────────────── */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-pad);
}
.section-pad { padding: var(--space-2xl) 0; }
.section-pad-sm { padding: var(--space-xl) 0; }
.text-center { text-align: center; }
.eyebrow {
  display: inline-block;
  font-family: var(--font-body);
  font-weight: var(--fw-medium);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--colour-primary);
  background: var(--colour-accent);
  border: 1px solid var(--colour-border);
  padding: 0.3rem 0.85rem;
  border-radius: 100px;
  margin-bottom: var(--space-md);
}
.section-intro {
  max-width: 600px;
  margin: 0 auto var(--space-xl);
}

/* ── BUTTONS ──────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-body);
  font-weight: var(--fw-medium);
  font-size: 0.95rem;
  padding: 0.75rem 1.75rem;
  border-radius: var(--border-radius);
  transition: var(--transition);
  text-decoration: none;
}
.btn-primary {
  background: var(--colour-primary);
  color: #fff;
  box-shadow: 0 4px 18px rgba(5,74,128,0.28);
}
.btn-primary:hover {
  background: #043d6b;
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(5,74,128,0.36);
}
.btn-outline {
  border: 2px solid var(--colour-primary);
  color: var(--colour-primary);
  background: transparent;
}
.btn-outline:hover {
  background: var(--colour-primary);
  color: #fff;
  transform: translateY(-2px);
}
.btn-sm {
  font-size: 0.87rem;
  padding: 0.5rem 1.2rem;
}

/* ── DIVIDER ──────────────────────────────────────────────── */
.divider {
  height: 1px;
  background: var(--colour-border);
  margin: var(--space-md) 0;
}

/* ── PRELOADER ────────────────────────────────────────────── */
#preloader {
  position: fixed;
  inset: 0;
  background: var(--colour-bg-white);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  transition: opacity 0.5s ease, visibility 0.5s ease;
}
#preloader.hidden { opacity: 0; visibility: hidden; pointer-events: none; }
.preloader-logo {
  width: 100px;
  height: 100px;
  animation: preloaderPulse 1s ease-in-out infinite alternate;
}
.preloader-text {
  margin-top: 1rem;
  font-family: var(--font-heading);
  font-weight: var(--fw-heading);
  font-size: 1.1rem;
  color: var(--colour-primary);
  letter-spacing: 0.05em;
}
@keyframes preloaderPulse {
  from { transform: scale(0.92); opacity: 0.7; }
  to   { transform: scale(1.05); opacity: 1; }
}

/* ── NAVIGATION ───────────────────────────────────────────── */
.site-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-height);
  background: rgba(255,255,255,0.97);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--colour-border);
  z-index: 1000;
  transition: box-shadow var(--transition);
}
.site-nav.scrolled { box-shadow: var(--shadow-md); }
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-pad);
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
}
.nav-logo img {
  height: 42px;
  width: auto;
}
.nav-logo-text {
  font-family: var(--font-heading);
  font-weight: var(--fw-heading);
  font-size: 1.05rem;
  color: var(--colour-primary);
  line-height: 1.2;
}
.nav-logo-text span {
  display: block;
  font-size: 0.7rem;
  font-weight: var(--fw-regular);
  color: var(--colour-text-mid);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}
.nav-item {
  position: relative;
}
.nav-link {
  font-family: var(--font-body);
  font-weight: var(--fw-medium);
  font-size: 0.9rem;
  color: var(--colour-text-dark);
  padding: 0.4rem 0.2rem;
  display: flex;
  align-items: center;
  gap: 0.3rem;
  transition: color var(--transition-fast);
  cursor: pointer;
  white-space: nowrap;
}
.nav-link:hover, .nav-link.active { color: var(--colour-primary); }
.nav-link svg { width: 14px; height: 14px; transition: transform var(--transition-fast); }
.nav-item:hover .nav-link svg { transform: rotate(180deg); }
.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px; left: 0;
  height: 2px; width: 0;
  background: var(--colour-primary);
  transition: width var(--transition);
  border-radius: 2px;
}
.nav-link:hover::after, .nav-link.active::after { width: 100%; }

/* Dropdown */
.nav-dropdown {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(-8px);
  background: #fff;
  border: 1px solid var(--colour-border);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-lg);
  min-width: 230px;
  padding: 0.5rem 0;
  margin-top: 8px;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition), transform var(--transition), visibility var(--transition);
  pointer-events: none;
}
.nav-item::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 0;
  right: 0;
  height: 8px;
}
.nav-item:hover .nav-dropdown,
.nav-item:focus-within .nav-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
  pointer-events: auto;
}
.nav-dropdown a {
  display: block;
  padding: 0.6rem 1.2rem;
  font-size: 0.88rem;
  color: var(--colour-text-dark);
  font-weight: var(--fw-regular);
  transition: background var(--transition-fast), color var(--transition-fast);
  white-space: nowrap;
}
.nav-dropdown a:hover {
  background: var(--colour-accent);
  color: var(--colour-primary);
}

/* Nav CTA */
.nav-cta {
  background: var(--colour-primary);
  color: #fff !important;
  padding: 0.55rem 1.3rem;
  border-radius: var(--border-radius);
  font-size: 0.9rem;
  font-weight: var(--fw-medium);
  transition: var(--transition);
  box-shadow: 0 3px 14px rgba(5,74,128,0.25);
}
.nav-cta:hover {
  background: #043d6b;
  transform: translateY(-1px);
  box-shadow: 0 6px 22px rgba(5,74,128,0.32);
  color: #fff !important;
}
.nav-cta::after { display: none !important; }

/* Hamburger */
.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 0.4rem;
  cursor: pointer;
}
.nav-hamburger span {
  display: block;
  height: 2px;
  width: 24px;
  background: var(--colour-primary);
  border-radius: 2px;
  transition: var(--transition);
}
.nav-hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-hamburger.open span:nth-child(2) { opacity: 0; }
.nav-hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Mobile nav */
.nav-mobile-overlay {
  display: none;
  position: fixed;
  top: var(--nav-height); left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.35);
  z-index: 998;
}
.nav-mobile-overlay.open { display: block; }
.nav-mobile-drawer {
  display: none;
  position: fixed;
  top: var(--nav-height); right: 0;
  width: min(320px, 90vw);
  height: calc(100vh - var(--nav-height));
  background: #fff;
  box-shadow: var(--shadow-lg);
  overflow-y: auto;
  z-index: 999;
  padding: 1.5rem 0 2rem;
  transform: translateX(100%);
  transition: transform 0.35s cubic-bezier(0.4,0,0.2,1);
}
.nav-mobile-drawer.open { display: block; transform: translateX(0); }
.mobile-nav-link {
  display: block;
  padding: 0.75rem 1.5rem;
  font-size: 0.95rem;
  font-weight: var(--fw-medium);
  color: var(--colour-text-dark);
  border-bottom: 1px solid rgba(5,74,128,0.08);
  transition: color var(--transition-fast), background var(--transition-fast);
}
.mobile-nav-link:hover { color: var(--colour-primary); background: var(--colour-accent); }
.mobile-nav-section { padding: 0.4rem 1.5rem 0.2rem; }
.mobile-nav-section-label {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--colour-secondary);
  display: block;
  margin-bottom: 0.3rem;
}
.mobile-nav-sub a {
  display: block;
  padding: 0.5rem 1.5rem 0.5rem 2rem;
  font-size: 0.88rem;
  color: var(--colour-text-mid);
  border-bottom: 1px solid rgba(5,74,128,0.05);
  transition: color var(--transition-fast);
}
.mobile-nav-sub a:hover { color: var(--colour-primary); }
.mobile-nav-cta {
  margin: 1.25rem 1.5rem 0;
  display: block;
  text-align: center;
}

/* ── FOOTER ───────────────────────────────────────────────── */
.site-footer {
  background: var(--colour-primary);
  color: rgba(255,255,255,0.85);
  padding: var(--space-2xl) 0 var(--space-md);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: var(--space-xl);
  padding-bottom: var(--space-xl);
  border-bottom: 1px solid rgba(255,255,255,0.15);
}
.footer-brand-logo {
  height: 48px;
  width: auto;
  margin-bottom: var(--space-sm);
  filter: brightness(0) invert(1);
}
.footer-brand-name {
  font-family: var(--font-heading);
  font-weight: var(--fw-heading);
  font-size: 1.1rem;
  color: #fff;
  margin-bottom: 0.5rem;
}
.footer-brand-tagline {
  font-size: 0.87rem;
  color: rgba(255,255,255,0.65);
  line-height: 1.6;
}
.footer-col h4 {
  font-family: var(--font-heading);
  font-weight: var(--fw-heading);
  font-size: 0.88rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.55);
  margin-bottom: 1rem;
}
.footer-col ul li { margin-bottom: 0.5rem; }
.footer-col ul li a {
  font-size: 0.9rem;
  color: rgba(255,255,255,0.8);
  transition: color var(--transition-fast);
}
.footer-col ul li a:hover { color: #fff; }
.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-md);
  flex-wrap: wrap;
  gap: 0.75rem;
}
.footer-copy {
  font-size: 0.82rem;
  color: rgba(255,255,255,0.5);
}
.footer-legal {
  display: flex;
  gap: 1.25rem;
}
.footer-legal a {
  font-size: 0.82rem;
  color: rgba(255,255,255,0.5);
  transition: color var(--transition-fast);
}
.footer-legal a:hover { color: rgba(255,255,255,0.85); }

/* ── PAGE HEADER ──────────────────────────────────────────── */
.page-header {
  padding: calc(var(--nav-height) + var(--space-xl)) 0 var(--space-xl);
  background: linear-gradient(135deg, var(--colour-primary) 0%, #0a6db8 100%);
  color: #fff;
  text-align: center;
}
.page-header .eyebrow {
  background: rgba(255,255,255,0.18);
  border-color: rgba(255,255,255,0.3);
  color: rgba(255,255,255,0.9);
}
.page-header h1 { color: #fff; margin-bottom: 0.75rem; }
.page-header p { color: rgba(255,255,255,0.75); max-width: 580px; margin: 0 auto; }

/* ── PAGE BODY OFFSET ─────────────────────────────────────── */
.page-content { padding-top: var(--nav-height); }

/* ── CARDS ────────────────────────────────────────────────── */
.card {
  background: #fff;
  border: 1px solid var(--colour-border);
  border-radius: var(--border-radius-lg);
  padding: var(--space-lg);
  transition: transform var(--transition), box-shadow var(--transition);
}
.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
}

/* ── FADE-IN ANIMATION (triggered by JS) ─────────────────── */
.fade-in { opacity: 0; transform: translateY(24px); transition: opacity 0.6s ease, transform 0.6s ease; }
.fade-in.visible { opacity: 1; transform: translateY(0); }
.fade-in-delay-1 { transition-delay: 0.1s; }
.fade-in-delay-2 { transition-delay: 0.2s; }
.fade-in-delay-3 { transition-delay: 0.3s; }
.fade-in-delay-4 { transition-delay: 0.4s; }

/* ── PLACEHOLDER IMAGES ───────────────────────────────────── */
.img-placeholder {
  background: var(--colour-bg-tinted);
  border: 2px dashed var(--colour-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  font-family: var(--font-body);
  color: var(--colour-text-mid);
  border-radius: var(--border-radius);
}

/* ── RESPONSIVE ───────────────────────────────────────────── */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; gap: var(--space-lg); }
}
@media (max-width: 768px) {
  .nav-menu { display: none; }
  .nav-hamburger { display: flex; }
  .footer-grid { grid-template-columns: 1fr; gap: var(--space-lg); }
  .footer-bottom { flex-direction: column; text-align: center; }
}