/* ==========================================================================
   The London Smile Clinic - Modernized Production Design System
   WCAG 2.1 AA Compliant | Mobile-First | Responsive & Performance Optimized
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. CSS Custom Properties / Design Tokens
   -------------------------------------------------------------------------- */
:root {
  /* Brand Color Palette (Contrast Checked for WCAG AA/AAA) */
  --color-primary: #c71b7e;          /* WCAG AA 4.65:1 on white */
  --color-primary-hover: #a81568;    /* Darker on hover */
  --color-primary-active: #880e52;   /* Active state */
  --color-primary-light: #fdf2f8;    /* 50 tint */
  --color-primary-subtle: #fbcfe8;   /* 100 tint */
  
  --color-gold: #b4833e;             /* Prestige gold for awards */
  --color-gold-light: #fef9ee;
  
  --color-dark: #121316;             /* Primary text & dark surfaces */
  --color-dark-surface: #1a1b1f;     /* Secondary dark */
  --color-body: #2d3139;             /* High contrast body text (10.2:1) */
  --color-muted: #575e6b;            /* Secondary muted text (5.1:1 on white) */
  --color-light-gray: #f4f5f7;       /* Section alternate background */
  --color-border: #e2e4e8;           /* Subtle borders */
  --color-white: #ffffff;
  
  /* Status Colors */
  --color-success: #15803d;
  --color-success-bg: #f0fdf4;
  
  /* Typography */
  --font-sans: 'Instrument Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-serif: Georgia, Cambria, 'Times New Roman', serif;
  
  /* Fluid Typographic Scale */
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.8125rem);
  --text-sm: clamp(0.875rem, 0.825rem + 0.25vw, 0.9375rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.0625rem);
  --text-md: clamp(1.125rem, 1.05rem + 0.35vw, 1.25rem);
  --text-lg: clamp(1.25rem, 1.15rem + 0.5vw, 1.5rem);
  --text-xl: clamp(1.5rem, 1.35rem + 0.75vw, 1.875rem);
  --text-2xl: clamp(1.875rem, 1.6rem + 1.2vw, 2.375rem);
  --text-3xl: clamp(2.25rem, 1.85rem + 1.8vw, 3.125rem);
  --text-hero: clamp(2.5rem, 2rem + 2.5vw, 4.25rem);
  
  /* Line Heights */
  --leading-tight: 1.15;
  --leading-snug: 1.3;
  --leading-normal: 1.6;
  --leading-loose: 1.8;
  
  /* Spacing Rhythm */
  --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;
  
  /* Containers & Layout */
  --container-max: 1320px;
  --container-narrow: 960px;
  --container-pad: clamp(1rem, 4vw, 2.5rem);
  
  /* Elevations & Shadows */
  --shadow-sm: 0 2px 8px rgba(18, 19, 22, 0.05);
  --shadow-md: 0 8px 24px rgba(18, 19, 22, 0.08);
  --shadow-lg: 0 16px 40px rgba(18, 19, 22, 0.12);
  --shadow-glow: 0 8px 30px rgba(199, 27, 126, 0.2);
  
  /* Radii */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;
  
  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-slow: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: var(--leading-normal);
  color: var(--color-body);
  background-color: var(--color-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
  overflow-x: clip; /* Fixes horizontal scroll without breaking sticky navigation */
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: clip;
  position: relative;
}

/* Accessible Focus Outlines */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
}

/* Skip to Content Link */
.skip-link {
  position: absolute;
  top: -100px;
  left: var(--space-md);
  background: var(--color-dark);
  color: var(--color-white);
  padding: var(--space-sm) var(--space-lg);
  z-index: 9999;
  border-radius: var(--radius-sm);
  font-weight: 600;
  text-decoration: none;
  transition: top var(--transition-fast);
}

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

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

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast), opacity var(--transition-fast);
}

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

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

ul, ol {
  list-style: none;
}

/* --------------------------------------------------------------------------
   3. Typography Helpers
   -------------------------------------------------------------------------- */
h1, h2, h3, h4, h5, h6 {
  color: var(--color-dark);
  font-weight: 700;
  line-height: var(--leading-tight);
  letter-spacing: -0.02em;
}

h1 { font-size: var(--text-hero); }
h2 { font-size: var(--text-3xl); margin-bottom: var(--space-md); }
h3 { font-size: var(--text-2xl); margin-bottom: var(--space-sm); }
h4 { font-size: var(--text-xl); }
h5 { font-size: var(--text-lg); }

p {
  font-size: var(--text-base);
  margin-bottom: var(--space-md);
}

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

mark {
  background: none;
  color: var(--color-primary);
  font-weight: inherit;
}

.eyebrow {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-primary);
  margin-bottom: var(--space-sm);
}

.section-intro {
  max-width: 680px;
  margin-inline: auto;
  text-align: center;
  margin-bottom: var(--space-2xl);
}

.section-intro p {
  color: var(--color-muted);
  font-size: var(--text-md);
}

/* --------------------------------------------------------------------------
   4. Layout Containers
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

.container--narrow {
  max-width: var(--container-narrow);
}

.section {
  padding-block: var(--space-3xl);
  position: relative;
}

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

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

.section--dark h2,
.section--dark h3,
.section--dark h4 {
  color: var(--color-white);
}

/* --------------------------------------------------------------------------
   5. Sticky Header & Glassmorphism Navigation
   (Direct child of <body>, position: sticky, top: 0, no overflow disabled)
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(18, 19, 22, 0.08);
  transition: box-shadow var(--transition-normal);
}

.site-header.is-scrolled {
  box-shadow: var(--shadow-sm);
}

/* Top Notification / Utility Bar */
.header-topbar {
  background-color: var(--color-dark);
  color: #d1d5db;
  font-size: var(--text-xs);
  padding-block: var(--space-xs);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.header-topbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.header-topbar__item {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  color: inherit;
  transition: color var(--transition-fast);
}

.header-topbar__item:hover {
  color: var(--color-white);
}

.header-topbar__item svg {
  width: 14px;
  height: 14px;
  fill: currentColor;
}

.header-topbar__badges {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.header-topbar__badge {
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  font-size: 0.72rem;
  font-weight: 600;
}

/* Main Navigation Bar */
.header-main {
  padding-block: var(--space-sm);
}

.header-main__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-lg);
}

.header-logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.header-logo img {
  height: 38px;
  width: auto;
}

/* Desktop Navigation Menu */
.nav-desktop {
  display: none;
  align-items: center;
  gap: var(--space-lg);
}

.nav-desktop__list {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.nav-desktop__link {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-dark);
  padding: var(--space-xs) var(--space-2xs);
  position: relative;
  transition: color var(--transition-fast);
}

.nav-desktop__link:hover,
.nav-desktop__link.active {
  color: var(--color-primary);
}

.nav-desktop__link.active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--color-primary);
  border-radius: var(--radius-full);
}

/* Dropdown Menu */
.has-dropdown {
  position: relative;
}

.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 240px;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  padding: var(--space-xs);
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: all var(--transition-fast);
  z-index: 100;
}

.has-dropdown:hover .dropdown-menu,
.has-dropdown:focus-within .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-menu a {
  display: block;
  padding: 0.5rem 0.85rem;
  font-size: var(--text-sm);
  font-weight: 500;
  border-radius: var(--radius-sm);
  color: var(--color-dark);
}

.dropdown-menu a:hover {
  background-color: var(--color-primary-light);
  color: var(--color-primary);
}

/* Header Action Buttons */
.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(--text-sm);
  font-weight: 600;
  color: var(--color-dark);
  padding: 0.5rem 0.85rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  transition: all var(--transition-fast);
}

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

.header-phone-link svg {
  width: 16px;
  height: 16px;
  fill: var(--color-primary);
}

/* Hamburger Trigger */
.menu-toggle-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  background: var(--color-light-gray);
  color: var(--color-dark);
  aria-label: "Toggle Menu";
  transition: background var(--transition-fast);
}

.menu-toggle-btn:hover {
  background: var(--color-primary-light);
  color: var(--color-primary);
}

.menu-toggle-btn svg {
  width: 24px;
  height: 24px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
}

/* --------------------------------------------------------------------------
   6. Mobile Navigation Drawer
   -------------------------------------------------------------------------- */
.mobile-drawer-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(18, 19, 22, 0.6);
  backdrop-filter: blur(4px);
  z-index: 1500;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.mobile-drawer-backdrop.is-open {
  opacity: 1;
  visibility: visible;
}

.mobile-drawer {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: min(85vw, 380px);
  background: var(--color-white);
  z-index: 1600;
  display: flex;
  flex-direction: column;
  box-shadow: -8px 0 32px rgba(0, 0, 0, 0.15);
  transform: translateX(100%);
  transition: transform var(--transition-normal);
  overflow-y: auto;
}

.mobile-drawer.is-open {
  transform: translateX(0);
}

.mobile-drawer__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-lg);
  border-bottom: 1px solid var(--color-border);
}

.mobile-drawer__header img {
  height: 32px;
}

.mobile-drawer__close {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  background: var(--color-light-gray);
}

.mobile-drawer__body {
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
  flex-grow: 1;
}

.mobile-nav-list {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.mobile-nav-item > a,
.mobile-nav-accordion-btn {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 0.75rem 0.5rem;
  font-size: var(--text-md);
  font-weight: 600;
  color: var(--color-dark);
  border-radius: var(--radius-sm);
  text-align: start;
}

.mobile-nav-item > a:hover,
.mobile-nav-item > a.active {
  color: var(--color-primary);
  background-color: var(--color-primary-light);
}

.mobile-subnav {
  padding-inline-start: 1rem;
  display: none;
  flex-direction: column;
  gap: 0.25rem;
  border-inline-start: 2px solid var(--color-border);
  margin-block: 0.25rem;
}

.mobile-subnav.is-expanded {
  display: flex;
}

.mobile-subnav a {
  padding: 0.5rem;
  font-size: var(--text-sm);
  color: var(--color-muted);
}

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

.mobile-drawer__footer {
  padding: var(--space-lg);
  border-top: 1px solid var(--color-border);
  background-color: var(--color-light-gray);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

/* --------------------------------------------------------------------------
   7. Buttons & Interactive Controls
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  min-height: 48px;
  padding: 0.75rem 1.6rem;
  border-radius: var(--radius-full);
  font-weight: 700;
  font-size: var(--text-sm);
  letter-spacing: 0.02em;
  text-align: center;
  transition: all var(--transition-fast);
  cursor: pointer;
  white-space: nowrap;
}

.btn--primary {
  background-color: var(--color-primary);
  color: var(--color-white);
  box-shadow: 0 4px 14px rgba(199, 27, 126, 0.35);
}

.btn--primary:hover {
  background-color: var(--color-primary-hover);
  color: var(--color-white);
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(199, 27, 126, 0.45);
}

.btn--primary:active {
  background-color: var(--color-primary-active);
  transform: translateY(0);
}

.btn--secondary {
  background-color: var(--color-dark);
  color: var(--color-white);
}

.btn--secondary:hover {
  background-color: #272a31;
  color: var(--color-white);
  transform: translateY(-1px);
}

.btn--outline {
  background-color: transparent;
  color: var(--color-dark);
  border: 1.5px solid var(--color-border);
}

.btn--outline:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background-color: var(--color-primary-light);
}

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

.btn--white:hover {
  background-color: #f4f5f7;
}

.btn--sm {
  min-height: 38px;
  padding: 0.4rem 1rem;
  font-size: var(--text-xs);
}

.btn--full {
  width: 100%;
}

/* --------------------------------------------------------------------------
   8. Hero Section (Accessible, High Performance, Pausable Video)
   -------------------------------------------------------------------------- */
.hero {
  position: relative;
  min-height: clamp(520px, 75vh, 800px);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-white);
  background-color: var(--color-dark);
  overflow: hidden;
  padding-block: var(--space-4xl) var(--space-3xl);
}

.hero__media {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
}

.hero__video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.45;
}

.hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    180deg,
    rgba(18, 19, 22, 0.6) 0%,
    rgba(18, 19, 22, 0.75) 100%
  );
  z-index: 2;
}

.hero__content {
  position: relative;
  z-index: 3;
  max-width: 860px;
  text-align: center;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  background: rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(8px);
  padding: 0.35rem 1rem;
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.25);
  margin-bottom: var(--space-md);
}

.hero h1 {
  color: var(--color-white);
  margin-bottom: var(--space-md);
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.4);
}

.hero p {
  font-size: var(--text-md);
  color: #e2e4e8;
  max-width: 680px;
  margin-inline: auto;
  margin-bottom: var(--space-xl);
}

.hero__actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  flex-wrap: wrap;
}

/* Video Play/Pause Control (WCAG 2.2.2 Compliance) */
.hero-video-toggle {
  position: absolute;
  bottom: var(--space-md);
  right: var(--space-md);
  z-index: 10;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(8px);
  color: var(--color-white);
  padding: 0.4rem 0.8rem;
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  border: 1px solid rgba(255, 255, 255, 0.2);
  transition: background var(--transition-fast);
}

.hero-video-toggle:hover {
  background: rgba(0, 0, 0, 0.85);
}

/* Subpage Hero */
.page-hero {
  background: linear-gradient(135deg, #16171b 0%, #282a32 100%);
  color: var(--color-white);
  padding-block: clamp(3rem, 7vw, 5.5rem);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.page-hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at top right, rgba(199, 27, 126, 0.25), transparent 60%);
  pointer-events: none;
}

.page-hero h1 {
  color: var(--color-white);
  margin-bottom: var(--space-sm);
}

.page-hero p {
  color: #d1d5db;
  max-width: 720px;
  margin-inline: auto;
  font-size: var(--text-md);
}

/* --------------------------------------------------------------------------
   9. Clinical Milestones & Stats Bar
   -------------------------------------------------------------------------- */
.stats-banner {
  background: var(--color-dark);
  color: var(--color-white);
  padding-block: var(--space-xl);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
  text-align: center;
}

.stat-card__number {
  font-size: var(--text-3xl);
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: var(--space-2xs);
}

.stat-card__label {
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #9ca3af;
}

/* --------------------------------------------------------------------------
   10. Clinical Guarantee Feature Card
   -------------------------------------------------------------------------- */
.guarantee-card {
  background: linear-gradient(135deg, #fdf2f8 0%, #fff 100%);
  border: 2px solid var(--color-primary-subtle);
  border-radius: var(--radius-xl);
  padding: clamp(1.5rem, 4vw, 3rem);
  position: relative;
  overflow: hidden;
}

.guarantee-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--color-primary);
  color: #fff;
  font-weight: 700;
  font-size: var(--text-xs);
  padding: 0.4rem 1rem;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-md);
}

/* --------------------------------------------------------------------------
   11. Team Showcase Cards
   -------------------------------------------------------------------------- */
.team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
}

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

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

.doctor-card__media {
  position: relative;
  aspect-ratio: 4 / 4.5;
  background-color: var(--color-light-gray);
  overflow: hidden;
}

.doctor-card__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top center;
  transition: transform var(--transition-slow);
}

.doctor-card:hover .doctor-card__media img {
  transform: scale(1.03);
}

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

.doctor-card__title {
  font-size: var(--text-lg);
  margin-bottom: var(--space-2xs);
}

.doctor-card__specialty {
  color: var(--color-primary);
  font-weight: 700;
  font-size: var(--text-sm);
  margin-bottom: var(--space-xs);
}

.doctor-card__gdc {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  background: var(--color-light-gray);
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-muted);
  width: fit-content;
  margin-bottom: var(--space-md);
}

.doctor-card__bio {
  color: var(--color-muted);
  font-size: var(--text-sm);
  line-height: var(--leading-normal);
  margin-bottom: var(--space-md);
  flex-grow: 1;
}

/* --------------------------------------------------------------------------
   12. Before & After Transformations (Interactive Tab Gallery)
   -------------------------------------------------------------------------- */
.transformation-gallery {
  margin-top: var(--space-xl);
}

.gallery-tabs {
  display: flex;
  justify-content: center;
  gap: var(--space-xs);
  flex-wrap: wrap;
  margin-bottom: var(--space-2xl);
}

.gallery-tab-btn {
  padding: 0.6rem 1.4rem;
  border-radius: var(--radius-full);
  font-weight: 700;
  font-size: var(--text-sm);
  background: var(--color-light-gray);
  color: var(--color-dark);
  border: 1px solid var(--color-border);
  transition: all var(--transition-fast);
}

.gallery-tab-btn:hover {
  background: var(--color-primary-light);
  color: var(--color-primary);
}

.gallery-tab-btn.is-active {
  background: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary);
  box-shadow: 0 4px 12px rgba(199, 27, 126, 0.25);
}

.gallery-panel {
  display: none;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
}

.gallery-panel.is-active {
  display: grid;
}

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

.transformation-card__images {
  display: grid;
  grid-template-columns: 1fr 1fr;
  background: #000;
  position: relative;
}

.transformation-card__item {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 10;
}

.transformation-card__item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.transformation-label {
  position: absolute;
  bottom: 8px;
  left: 8px;
  background: rgba(0, 0, 0, 0.7);
  color: #fff;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
}

.transformation-card__body {
  padding: var(--space-md);
}

.transformation-card__title {
  font-size: var(--text-md);
  margin-bottom: var(--space-2xs);
}

.transformation-card__desc {
  font-size: var(--text-sm);
  color: var(--color-muted);
}

/* --------------------------------------------------------------------------
   13. Accessible FAQ Accordions (Strict Semantic Button & ARIA)
   -------------------------------------------------------------------------- */
.faq-accordion {
  max-width: 860px;
  margin-inline: auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

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

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

.faq-question {
  width: 100%;
  padding: var(--space-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  text-align: start;
  font-weight: 700;
  font-size: var(--text-md);
  color: var(--color-dark);
  background: none;
  cursor: pointer;
  transition: color var(--transition-fast);
}

.faq-question:hover {
  color: var(--color-primary);
}

.faq-icon {
  width: 28px;
  height: 28px;
  border-radius: var(--radius-full);
  background: var(--color-light-gray);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: transform var(--transition-normal), background-color var(--transition-fast);
}

.faq-item.is-open .faq-icon {
  transform: rotate(180deg);
  background: var(--color-primary);
  color: #fff;
}

.faq-answer {
  padding: 0 var(--space-lg) var(--space-lg);
  color: var(--color-muted);
  line-height: var(--leading-normal);
  font-size: var(--text-base);
  display: none;
}

.faq-item.is-open .faq-answer {
  display: block;
}

/* --------------------------------------------------------------------------
   14. Pricing & Schedule of Fees (GEO / SEO Structured Tables)
   -------------------------------------------------------------------------- */
.fee-table-container {
  overflow-x: auto;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  margin-bottom: var(--space-2xl);
}

.fee-table {
  width: 100%;
  border-collapse: collapse;
  text-align: start;
  font-size: var(--text-sm);
}

.fee-table th,
.fee-table td {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--color-border);
}

.fee-table th {
  background-color: var(--color-dark);
  color: var(--color-white);
  font-weight: 700;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  font-size: var(--text-xs);
}

.fee-table tr:hover td {
  background-color: #fafbfc;
}

.fee-table td.price {
  font-weight: 700;
  color: var(--color-primary);
  white-space: nowrap;
}

.fee-table td.finance {
  color: var(--color-muted);
  font-size: var(--text-xs);
}

/* --------------------------------------------------------------------------
   15. Patient Testimonials & Working Feedback Reviews
   -------------------------------------------------------------------------- */
.reviews-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
}

.review-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
}

.review-card__header {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

.review-avatar {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  background: var(--color-primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: var(--text-md);
}

.review-stars {
  display: flex;
  gap: 3px;
  color: #f59e0b; /* Accessible gold */
}

.review-stars svg {
  width: 16px;
  height: 16px;
  fill: currentColor;
}

.review-text {
  font-size: var(--text-base);
  color: var(--color-body);
  font-style: italic;
  line-height: var(--leading-normal);
}

/* --------------------------------------------------------------------------
   16. Forms (Visible Labels, Accessible Layouts, Zero Regressions)
   -------------------------------------------------------------------------- */
.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  margin-bottom: var(--space-md);
  text-align: start;
}

.form-label {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-dark);
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  min-height: 48px;
  padding: 0.75rem 1rem;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  background-color: var(--color-white);
  color: var(--color-dark);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-textarea {
  min-height: 120px;
  resize: vertical;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-subtle);
}

.honeypot-field {
  display: none !important;
}

/* --------------------------------------------------------------------------
   17. Accessible Consultation Modal Dialog (Focus Trap, ARIA)
   -------------------------------------------------------------------------- */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(18, 19, 22, 0.75);
  backdrop-filter: blur(8px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-md);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.modal-backdrop.is-open {
  opacity: 1;
  visibility: visible;
}

.modal-dialog {
  background: var(--color-white);
  border-radius: var(--radius-xl);
  max-width: 800px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
  position: relative;
  transform: scale(0.96);
  transition: transform var(--transition-normal);
  display: grid;
  grid-template-columns: 1fr;
}

.modal-backdrop.is-open .modal-dialog {
  transform: scale(1);
}

.modal-dialog__media {
  display: none;
  background: var(--color-dark);
}

.modal-dialog__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.modal-dialog__content {
  padding: clamp(1.5rem, 5vw, 2.5rem);
  position: relative;
}

.modal-close-btn {
  position: absolute;
  top: var(--space-md);
  right: var(--space-md);
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  background: var(--color-light-gray);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-dark);
  transition: background-color var(--transition-fast);
}

.modal-close-btn:hover {
  background: var(--color-primary-light);
  color: var(--color-primary);
}

/* --------------------------------------------------------------------------
   18. Comprehensive Multi-Column Footer
   -------------------------------------------------------------------------- */
.site-footer {
  background-color: #0f1013;
  color: #9ca3af;
  padding-top: var(--space-4xl);
  padding-bottom: var(--space-2xl);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-accreditations {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xl);
  flex-wrap: wrap;
  padding-bottom: var(--space-3xl);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  margin-bottom: var(--space-3xl);
}

.footer-accreditation-item {
  height: 44px;
  opacity: 0.85;
  filter: grayscale(1) brightness(1.6);
  transition: opacity var(--transition-fast), filter var(--transition-fast);
}

.footer-accreditation-item:hover {
  opacity: 1;
  filter: none;
}

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

.footer-col h3,
.footer-col h4 {
  color: var(--color-white);
  font-size: var(--text-md);
  font-weight: 700;
  margin-bottom: var(--space-lg);
  letter-spacing: 0.02em;
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.footer-col a {
  color: #9ca3af;
  font-size: var(--text-sm);
  transition: color var(--transition-fast);
}

.footer-col a:hover {
  color: var(--color-white);
}

.footer-contact-item {
  display: flex;
  gap: var(--space-sm);
  margin-bottom: var(--space-sm);
  font-size: var(--text-sm);
  color: #d1d5db;
}

.footer-social-list {
  display: flex;
  gap: var(--space-sm);
  margin-top: var(--space-md);
}

.footer-social-link {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.08);
  color: var(--color-white);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition-fast), transform var(--transition-fast);
}

.footer-social-link:hover {
  background: var(--color-primary);
  transform: translateY(-2px);
}

.footer-social-link svg {
  width: 20px;
  height: 20px;
  fill: currentColor;
}

.footer-bottom {
  padding-top: var(--space-xl);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  flex-wrap: wrap;
  font-size: var(--text-xs);
  color: #6b7280;
}

.footer-bottom a {
  color: inherit;
  text-decoration: underline;
}

.footer-bottom a:hover {
  color: var(--color-white);
}

/* --------------------------------------------------------------------------
   19. Back to Top & Sticky WhatsApp Buttons
   -------------------------------------------------------------------------- */
.back-to-top {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 52px;
  height: 52px;
  border-radius: var(--radius-full);
  background-color: var(--color-dark);
  color: var(--color-white);
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 990;
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px);
  transition: opacity var(--transition-normal), visibility var(--transition-normal), transform var(--transition-normal), background-color var(--transition-fast);
}

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

.back-to-top:hover {
  background-color: var(--color-primary);
  transform: translateY(-2px);
}

.back-to-top svg {
  width: 20px;
  height: 20px;
  fill: currentColor;
}

.whatsapp-float {
  position: fixed;
  bottom: 24px;
  left: 24px;
  z-index: 990;
  background-color: #25d366;
  color: var(--color-white);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1.2rem;
  border-radius: var(--radius-full);
  font-weight: 700;
  font-size: var(--text-xs);
  box-shadow: 0 4px 16px rgba(37, 211, 102, 0.4);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.whatsapp-float:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(37, 211, 102, 0.5);
}

.whatsapp-float svg {
  width: 20px;
  height: 20px;
  fill: currentColor;
}

/* --------------------------------------------------------------------------
   20. Responsive Media Queries (Mobile-First Breakpoints)
   -------------------------------------------------------------------------- */

/* Small Tablets / Large Phones (640px+) */
@media (min-width: 640px) {
  .stats-grid {
    grid-template-columns: repeat(4, 1fr);
  }
  
  .gallery-panel {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .team-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Medium Tablets (768px+) */
@media (min-width: 768px) {
  .header-phone-link {
    display: inline-flex;
  }
  
  .modal-dialog {
    grid-template-columns: 280px 1fr;
  }
  
  .modal-dialog__media {
    display: block;
  }
  
  .footer-grid {
    grid-template-columns: 1.5fr repeat(3, 1fr);
  }
}

/* Laptops & Desktop (1024px+) */
@media (min-width: 1024px) {
  .nav-desktop {
    display: flex;
  }
  
  .menu-toggle-btn {
    display: none;
  }
  
  .gallery-panel {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .reviews-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .team-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* Large Displays (1280px+) */
@media (min-width: 1280px) {
  .hero {
    min-height: 80vh;
  }
}

/* Vestibular Disorder Accessibility */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  
  .hero__video {
    display: none;
  }
}