/* ============================================
   MOBILE-FIRST RESPONSIVE ENHANCEMENTS
   Modern responsive design with accessibility
   Collagen Clinic London - Comprehensive Mobile Optimization
   Last Updated: 2025
   ============================================ */

/* ============================================
   CSS CUSTOM PROPERTIES FOR RESPONSIVENESS
   ============================================ */
:root {
    /* Breakpoints */
    --mobile: 480px;
    --tablet: 768px;
    --desktop: 1024px;
    --large-desktop: 1400px;
    
    /* Spacing - Mobile-first */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;
    
    /* Typography - Mobile-first (starting small) */
    --font-size-xs: 0.75rem;
    --font-size-base: 1rem;
    --font-size-sm: 0.875rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 2.5rem;
    --font-size-5xl: 3rem;
    
    /* Touch targets - Minimum 44x44px for accessibility (WCAG 2.1) */
    --touch-target-min: 44px;
    --touch-target-comfortable: 48px;
    
    /* Contrast ratios for accessibility */
    --contrast-ratio-text: 4.5; /* WCAG AA */
    --contrast-ratio-large: 3; /* WCAG AA for large text */
    
    /* Animation timing */
    --transition-fast: 0.15s;
    --transition-normal: 0.3s;
    --transition-slow: 0.5s;
    
    /* Z-index scale */
    --z-dropdown: 100;
    --z-sticky: 500;
    --z-fixed: 1000;
    --z-modal-backdrop: 1400;
    --z-modal: 1500;
    --z-tooltip: 1600;
    
    /* Safe area insets for notched devices */
    --safe-area-top: env(safe-area-inset-top, 0px);
    --safe-area-bottom: env(safe-area-inset-bottom, 0px);
    --safe-area-left: env(safe-area-inset-left, 0px);
    --safe-area-right: env(safe-area-inset-right, 0px);
}

/* ============================================
   MOBILE-FIRST BASE STYLES
   ============================================ */

/* Base typography scales from mobile */
body {
    font-size: var(--font-size-base);
}

h1 { font-size: var(--font-size-3xl); }
h2 { font-size: var(--font-size-2xl); }
h3 { font-size: var(--font-size-xl); }
h4 { font-size: var(--font-size-lg); }

.section-title {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-md);
}

/* Container - Mobile-first padding */
.container {
    padding-left: var(--spacing-sm);
    padding-right: var(--spacing-sm);
}

/* ============================================
   TOUCH-FRIENDLY INTERACTIVE ELEMENTS
   ============================================ */

/* Ensure all clickable elements meet minimum touch target size */
a, button, input[type="button"], input[type="submit"], 
.btn-primary, .btn-secondary, .nav-link {
    min-height: var(--touch-target-min);
    min-width: var(--touch-target-min);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    -webkit-tap-highlight-color: rgba(0, 0, 0, 0.1);
    touch-action: manipulation; /* Prevent double-tap zoom on buttons */
}

/* Improved touch feedback */
button:active, a:active, .btn-primary:active, .btn-secondary:active {
    transform: scale(0.98);
    transition: transform 0.1s ease;
}

/* ============================================
   IMAGE OPTIMIZATION & LAZY LOADING
   ============================================ */

/* Base image styles for lazy loading */
img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* Lazy-loaded images - native browser handling */
img[loading="lazy"] {
    opacity: 1;
}

/* Placeholder blur effect while loading */
img[data-src] {
    filter: blur(5px);
    transition: filter 0.3s ease;
}

img[data-src].loaded {
    filter: blur(0);
}

/* Responsive image containers */
.image-wrapper {
    position: relative;
    overflow: hidden;
    background-color: #f5f5f5;
}

.image-wrapper::before {
    content: '';
    display: block;
    padding-top: 56.25%; /* 16:9 aspect ratio placeholder */
}

.image-wrapper img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* ============================================
   ACCESSIBILITY ENHANCEMENTS
   ============================================ */

/* Focus indicators for keyboard navigation */
*:focus {
    outline: 2px solid #000000;
    outline-offset: 2px;
}

*:focus:not(:focus-visible) {
    outline: none;
}

*:focus-visible {
    outline: 2px solid #000000;
    outline-offset: 2px;
}

/* Skip to main content link for screen readers */
.skip-to-main {
    position: absolute;
    top: -40px;
    left: 0;
    background: #000000;
    color: #ffffff;
    padding: 0.5rem 1rem;
    text-decoration: none;
    z-index: 10000;
}

.skip-to-main:focus {
    top: 0;
}

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

/* High contrast mode support */
@media (prefers-contrast: high) {
    body {
        background: #ffffff;
        color: #000000;
    }
    
    a, button {
        border: 2px solid currentColor;
    }
}

/* Reduced motion support */
@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;
    }
}

/* ============================================
   MOBILE-FIRST RESPONSIVE BREAKPOINTS
   ============================================ */

/* Mobile: Base styles (up to 479px) - Already defined above */

/* Tablet: 480px and up */
@media (min-width: 480px) {
    body {
        font-size: var(--font-size-lg);
    }
    
    .container {
        padding-left: var(--spacing-md);
        padding-right: var(--spacing-md);
    }
    
    h1 { font-size: var(--font-size-4xl); }
    h2 { font-size: var(--font-size-3xl); }
    .section-title {
        font-size: var(--font-size-3xl);
    }
}

/* Tablet Landscape / Small Desktop: 769px and up */
@media (min-width: 769px) {
    body {
        font-size: var(--font-size-xl);
    }
    
    .container {
        padding-left: var(--spacing-lg);
        padding-right: var(--spacing-lg);
    }
    
    .section-title {
        font-size: 3rem;
    }
    
    /* Navigation - Show full menu on tablet+ */
    .nav-menu {
        display: flex !important;
        position: static !important;
        left: auto !important;
        width: auto !important;
        height: auto !important;
        background: transparent !important;
        flex-direction: row !important;
        padding: 0 !important;
    }
    
    .hamburger {
        display: none !important;
    }
}

/* Desktop: 1024px and up */
@media (min-width: 1024px) {
    .container {
        max-width: 1200px;
        padding-left: 2rem;
        padding-right: 2rem;
    }
}

/* Large Desktop: 1400px and up */
@media (min-width: 1400px) {
    .container {
        max-width: 1400px;
        padding-left: 2rem;
        padding-right: 2rem;
    }
}

/* ============================================
   RESPONSIVE GRID IMPROVEMENTS
   ============================================ */

/* Mobile-first grid - single column by default */
.quick-links-grid,
.packages-grid,
.benefits-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
}

/* Tablet: 2 columns */
@media (min-width: 768px) {
    .quick-links-grid,
    .packages-grid,
    .benefits-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-lg);
    }
}

/* Desktop: 3 columns */
@media (min-width: 1024px) {
    .quick-links-grid,
    .packages-grid,
    .benefits-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* Auto-fit grids - mobile-first */
.auto-fit-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
}

@media (min-width: 480px) {
    .auto-fit-grid {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    }
}

/* ============================================
   RESPONSIVE NAVIGATION ENHANCEMENTS
   ============================================ */

/* Mobile menu improvements */
@media (max-width: 768px) {
    /* Mobile Navigation Menu - Base State (Hidden) */
    .nav-menu {
        position: fixed !important;
        top: 70px !important;
        left: -100% !important;
        width: 100% !important;
        height: calc(100vh - 70px) !important;
        background: #ffffff !important;
        flex-direction: column !important;
        align-items: stretch !important;
        padding: 0 !important;
        transition: left 0.3s ease-in-out !important;
        overflow-y: auto !important;
        -webkit-overflow-scrolling: touch;
        z-index: 999 !important;
        display: flex !important;
        box-shadow: 2px 0 10px rgba(0, 0, 0, 0.1);
    }
    
    /* Mobile Navigation Menu - Active State (Visible) */
    .nav-menu.active {
        left: 0 !important;
    }
    
    /* Nav Items */
    .nav-item {
        width: 100% !important;
        margin: 0 !important;
        border-bottom: 1px solid rgba(0, 0, 0, 0.08) !important;
    }
    
    /* Nav Links - Make them full width and tappable */
    .nav-menu .nav-link {
        width: 100% !important;
        padding: 18px 24px !important;
        justify-content: flex-start !important;
        text-align: left !important;
        font-size: 1.1rem !important;
        color: #1a1a1a !important;
        display: flex !important;
        align-items: center !important;
        min-height: 56px !important;
        background: transparent !important;
        border: none !important;
    }
    
    .nav-menu .nav-link:hover,
    .nav-menu .nav-link:active {
        background: rgba(0, 0, 0, 0.03) !important;
    }
    
    /* Dropdown arrow */
    .nav-menu .dropdown-arrow {
        margin-left: auto !important;
        transition: transform 0.3s ease !important;
    }
    
    .nav-item.dropdown.active .dropdown-arrow {
        transform: rotate(180deg) !important;
    }
    
    /* Mobile Dropdown Menus */
    .nav-menu .dropdown-menu,
    .nav-menu .mega-menu {
        position: static !important;
        width: 100% !important;
        max-height: 0 !important;
        overflow: hidden !important;
        opacity: 1 !important;
        visibility: visible !important;
        background: rgba(0, 0, 0, 0.02) !important;
        box-shadow: none !important;
        border-radius: 0 !important;
        padding: 0 !important;
        margin: 0 !important;
        transition: max-height 0.3s ease-in-out !important;
        display: block !important;
        transform: none !important;
    }
    
    .nav-item.dropdown.active .dropdown-menu,
    .nav-item.dropdown.active .mega-menu {
        max-height: 1000px !important;
        padding: 8px 0 !important;
    }
    
    /* Mega Menu Columns on Mobile */
    .nav-menu .mega-menu-column {
        width: 100% !important;
        padding: 0 !important;
        margin: 0 !important;
    }
    
    .nav-menu .mega-menu-column h4 {
        padding: 12px 32px 8px !important;
        font-size: 0.85rem !important;
        color: #666 !important;
        text-transform: uppercase !important;
        letter-spacing: 0.05em !important;
        margin: 0 !important;
    }
    
    .nav-menu .mega-menu-column li {
        margin: 0 !important;
        padding: 0 !important;
        list-style: none !important;
    }
    
    .nav-menu .mega-menu-column a,
    .nav-menu .dropdown-menu a {
        display: block !important;
        padding: 14px 40px !important;
        color: #333 !important;
        font-size: 1rem !important;
        text-decoration: none !important;
        min-height: 48px !important;
        line-height: 1.4 !important;
    }
    
    .nav-menu .mega-menu-column a:hover,
    .nav-menu .mega-menu-column a:active,
    .nav-menu .dropdown-menu a:hover,
    .nav-menu .dropdown-menu a:active {
        background: rgba(0, 0, 0, 0.05) !important;
    }
    
    /* Book Appointment Button in Mobile Menu */
    .nav-menu .btn-appointment {
        margin: 16px 24px !important;
        padding: 16px 24px !important;
        text-align: center !important;
        justify-content: center !important;
        border-radius: 8px !important;
    }
    
    /* Show hamburger on mobile - HIGH PRIORITY */
    .hamburger,
    .nav-container .hamburger,
    nav .hamburger,
    .navbar .hamburger,
    .nav-container > .hamburger {
        display: flex !important;
        visibility: visible !important;
        opacity: 1 !important;
        min-width: 44px !important;
        min-height: 44px !important;
        padding: 8px !important;
        flex-direction: column !important;
        justify-content: center !important;
        align-items: center !important;
        position: relative !important;
        z-index: 1001 !important;
        background: transparent !important;
        border: none !important;
        cursor: pointer !important;
        -webkit-tap-highlight-color: transparent !important;
    }
    
    .hamburger .bar,
    .nav-container .hamburger .bar,
    nav .hamburger .bar {
        display: block !important;
        visibility: visible !important;
        opacity: 1 !important;
        width: 26px !important;
        height: 3px !important;
        background-color: #1a1a1a !important;
        margin: 4px 0 !important;
        border-radius: 2px !important;
        transition: all 0.3s ease !important;
    }
    
    /* Hamburger Animation */
    .hamburger.active .bar:nth-child(1) {
        transform: translateY(11px) rotate(45deg) !important;
    }
    
    .hamburger.active .bar:nth-child(2) {
        opacity: 0 !important;
        transform: translateX(-20px) !important;
    }
    
    .hamburger.active .bar:nth-child(3) {
        transform: translateY(-11px) rotate(-45deg) !important;
    }
    
    /* Mobile carousel fixes */
    .packages-carousel-container {
        padding: 0 10px !important;
    }
    
    .packages-carousel {
        gap: 1rem !important;
    }
    
    .packages-carousel .package-card {
        min-width: 280px !important;
        max-width: 85vw;
    }
    
    .carousel-btn {
        width: 36px !important;
        height: 36px !important;
        font-size: 1.2rem !important;
    }
    
    .carousel-prev {
        left: 0 !important;
    }
    
    .carousel-next {
        right: 0 !important;
    }
}

/* ============================================
   RESPONSIVE TYPOGRAPHY SCALE
   ============================================ */

/* Fluid typography using clamp for better scaling */
.hero-title {
    font-size: clamp(2rem, 5vw, 3.5rem);
    line-height: 1.2;
}

.hero-subtitle {
    font-size: clamp(1rem, 2.5vw, 1.25rem);
}

.section-title {
    font-size: clamp(1.5rem, 4vw, 3rem);
}

/* ============================================
   PERFORMANCE OPTIMIZATIONS
   ============================================ */

/* Contain content for better rendering performance */
.hero,
.section,
.navbar {
    contain: layout style paint;
}

/* Will-change hints for animations */
.animate-on-scroll {
    will-change: transform, opacity;
}

/* ============================================
   RESPONSIVE SPACING UTILITIES
   ============================================ */

/* Mobile-first spacing */
.section {
    padding: var(--spacing-xl) 0;
}

@media (min-width: 768px) {
    .section {
        padding: calc(var(--spacing-xl) * 1.5) 0;
    }
}

@media (min-width: 1024px) {
    .section {
        padding: calc(var(--spacing-xl) * 2) 0;
    }
}

/* ============================================
   RESPONSIVE IMAGE CONTAINERS
   ============================================ */

.hero-image-container,
.package-card-image {
    position: relative;
    width: 100%;
    overflow: hidden;
    background: #f5f5f5;
}

/* Aspect ratio containers */
.aspect-16-9 {
    padding-bottom: 56.25%;
}

.aspect-4-3 {
    padding-bottom: 75%;
}

.aspect-1-1 {
    padding-bottom: 100%;
}

/* ============================================
   MOBILE-SPECIFIC IMPROVEMENTS
   ============================================ */

@media (max-width: 767px) {
    /* Reduce padding on mobile */
    .section {
        padding: var(--spacing-lg) 0;
    }
    
    /* Stack buttons vertically on mobile */
    .cta-buttons,
    .hero-buttons {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .btn-primary,
    .btn-secondary {
        width: 100%;
    }
    
    /* Full-width cards on mobile */
    .package-card,
    .treatment-card {
        width: 100%;
        margin: 0;
    }
    
    /* Improved text readability on mobile */
    p, li {
        font-size: var(--font-size-base);
        line-height: 1.7;
    }
    
    /* Better spacing for touch */
    .nav-link,
    .dropdown-menu a {
        padding: var(--spacing-md);
        font-size: var(--font-size-base);
    }
}

/* ============================================
   PRINT STYLES
   ============================================ */

@media print {
    .navbar,
    .hamburger,
    .btn-primary,
    .btn-secondary,
    .footer {
        display: none;
    }
    
    body {
        font-size: 12pt;
        line-height: 1.5;
    }
    
    a {
        text-decoration: underline;
    }
    
    img {
        max-width: 100%;
        page-break-inside: avoid;
    }
}

/* ============================================
   HERO SECTION - MOBILE-FIRST RESPONSIVE
   ============================================ */

.hero {
    padding-top: calc(70px + var(--safe-area-top)); /* Account for fixed navbar + notch */
    min-height: 100vh;
    min-height: 100dvh; /* Dynamic viewport height for mobile browsers */
}

.hero-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    padding: var(--spacing-md);
}

.hero-content {
    order: 1;
    text-align: center;
}

.hero-image {
    order: 2;
    width: 100%;
}

.hero-image-photo {
    width: 100%;
    height: auto;
    min-height: 300px;
    object-fit: cover;
    border-radius: 12px;
}

/* Tablet and up: side-by-side hero layout */
@media (min-width: 768px) {
    .hero-container {
        flex-direction: row;
        align-items: center;
        gap: var(--spacing-xl);
        padding: var(--spacing-xl);
    }
    
    .hero-content {
        flex: 1;
        order: 1;
        text-align: left;
    }
    
    .hero-image {
        flex: 1;
        order: 2;
    }
}

/* Desktop: larger hero */
@media (min-width: 1024px) {
    .hero-container {
        max-width: 1400px;
        margin: 0 auto;
        padding: var(--spacing-2xl);
    }
    
    .hero-content {
        flex: 0 0 55%;
    }
    
    .hero-image {
        flex: 0 0 45%;
    }
}

/* ============================================
   CAROUSEL - TOUCH-FRIENDLY MOBILE
   ============================================ */

.packages-carousel-container {
    position: relative;
    overflow: hidden;
    -webkit-overflow-scrolling: touch;
    scroll-snap-type: x mandatory;
    scroll-behavior: smooth;
    padding: 0 var(--spacing-sm);
}

.packages-carousel-wrapper {
    overflow-x: auto;
    overflow-y: hidden;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none; /* Firefox */
    -ms-overflow-style: none; /* IE/Edge */
}

.packages-carousel-wrapper::-webkit-scrollbar {
    display: none; /* Chrome/Safari */
}

.packages-carousel {
    display: flex;
    gap: var(--spacing-md);
    scroll-snap-type: x mandatory;
}

.package-card {
    flex: 0 0 280px;
    scroll-snap-align: start;
    scroll-snap-stop: always;
}

/* Mobile carousel - smaller buttons + touch swipe */
@media (max-width: 767px) {
    .carousel-btn,
    .carousel-prev,
    .carousel-next {
        display: flex !important;
        width: 32px !important;
        height: 32px !important;
        font-size: 1rem !important;
        opacity: 0.8;
        left: 2px !important;
        right: auto !important;
    }
    
    .carousel-next {
        left: auto !important;
        right: 2px !important;
    }
    
    .packages-carousel-container {
        padding: 0 35px !important;
        overflow: visible !important;
        max-width: 100% !important;
    }
    
    .packages-carousel-wrapper {
        overflow-x: auto !important;
        overflow-y: hidden !important;
        -webkit-overflow-scrolling: touch;
        scroll-snap-type: x mandatory;
        scrollbar-width: none; /* Firefox */
        -ms-overflow-style: none; /* IE/Edge */
    }
    
    .packages-carousel-wrapper::-webkit-scrollbar {
        display: none; /* Chrome/Safari */
    }
    
    .packages-carousel,
    #packagesCarousel {
        scroll-snap-type: x mandatory;
        gap: 1rem !important;
        /* Allow JS transform for carousel navigation */
    }
    
    .packages-carousel .package-card,
    #packagesCarousel .package-card {
        min-width: 260px !important;
        max-width: 280px !important;
        flex: 0 0 auto !important;
        scroll-snap-align: center;
    }
    
    /* Reduce image height on mobile */
    .packages-carousel .package-card > div:first-child,
    #packagesCarousel .package-card > div:first-child {
        height: 180px !important;
    }
}

/* Tablet: Show carousel buttons, adjust card size */
@media (min-width: 768px) {
    .package-card {
        flex: 0 0 320px;
    }
    
    .carousel-btn {
        display: flex !important;
        width: 44px;
        height: 44px;
        min-width: var(--touch-target-min);
        min-height: var(--touch-target-min);
    }
}

/* Desktop: Larger cards */
@media (min-width: 1024px) {
    .package-card {
        flex: 0 0 350px;
    }
}

/* ============================================
   FOOTER - MOBILE-FIRST
   ============================================ */

.footer {
    padding-bottom: calc(var(--spacing-xl) + var(--safe-area-bottom));
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
}

.footer-section {
    text-align: center;
}

@media (min-width: 480px) {
    .footer-content {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-section {
        text-align: left;
    }
}

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

@media (min-width: 1024px) {
    .footer-content {
        grid-template-columns: 2fr repeat(4, 1fr);
    }
}

/* ============================================
   FORMS - MOBILE-FIRST
   ============================================ */

input, select, textarea {
    width: 100%;
    padding: var(--spacing-md);
    font-size: var(--font-size-base);
    border: 1px solid #e0e0e0;
    border-radius: 8px;
    min-height: var(--touch-target-min);
    -webkit-appearance: none;
    appearance: none;
}

input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: #000000;
    box-shadow: 0 0 0 2px rgba(0, 0, 0, 0.1);
}

/* Prevent zoom on input focus on iOS */
@media (max-width: 767px) {
    input, select, textarea {
        font-size: 16px !important; /* Prevents iOS zoom */
    }
}

/* ============================================
   TREATMENT CARDS - MOBILE-FIRST
   ============================================ */

.treatment-options {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
}

.option-card {
    padding: var(--spacing-lg);
    background: #f9f9f9;
    border-radius: 12px;
}

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

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

/* ============================================
   MODALS - MOBILE-FIRST
   ============================================ */

.modal,
#treatmentModal {
    padding: var(--spacing-sm);
    padding-top: calc(var(--spacing-sm) + var(--safe-area-top));
    padding-bottom: calc(var(--spacing-sm) + var(--safe-area-bottom));
}

.modal-content {
    width: 100%;
    max-width: 100%;
    max-height: calc(100vh - 2rem);
    max-height: calc(100dvh - 2rem);
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    border-radius: 16px;
    padding: var(--spacing-md);
}

@media (min-width: 768px) {
    .modal-content {
        max-width: 90%;
        padding: var(--spacing-xl);
    }
}

@media (min-width: 1024px) {
    .modal-content {
        max-width: 900px;
    }
}

/* ============================================
   NAVIGATION DROPDOWN - MOBILE
   ============================================ */

@media (max-width: 767px) {
    .dropdown-menu {
        position: static;
        max-height: 0;
        overflow: hidden;
        transition: max-height var(--transition-normal) ease;
        background: #f9f9f9;
        border-radius: 8px;
        margin-top: var(--spacing-sm);
    }
    
    .nav-item.dropdown.active .dropdown-menu {
        max-height: 500px;
    }
    
    .mega-menu {
        flex-direction: column;
        gap: var(--spacing-md);
        padding: var(--spacing-md);
    }
    
    .mega-menu-column {
        width: 100%;
    }
    
    .mega-menu-column h4 {
        font-size: var(--font-size-sm);
        margin-bottom: var(--spacing-sm);
        color: #666;
    }
    
    .mega-menu-column li {
        padding: var(--spacing-sm) 0;
    }
    
    .mega-menu-column a {
        display: block;
        min-height: var(--touch-target-min);
        padding: var(--spacing-sm);
        font-size: var(--font-size-base);
    }
}

/* ============================================
   BUTTON IMPROVEMENTS - MOBILE
   ============================================ */

@media (max-width: 767px) {
    .btn-primary,
    .btn-secondary {
        width: 100%;
        padding: var(--spacing-md);
        font-size: var(--font-size-base);
        min-height: var(--touch-target-comfortable);
    }
    
    .cta-buttons {
        display: flex;
        flex-direction: column;
        gap: var(--spacing-sm);
        width: 100%;
    }
}

/* ============================================
   BENEFITS GRID - MOBILE-FIRST
   ============================================ */

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

.benefit-item {
    padding: var(--spacing-lg);
    background: #f9f9f9;
    border-radius: 12px;
}

@media (min-width: 480px) {
    .benefits-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

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

/* ============================================
   TREATMENT HIGHLIGHTS - MOBILE-FIRST
   ============================================ */

.treatment-highlights {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-lg);
}

.highlight-item {
    padding: var(--spacing-md);
    background: rgba(255, 255, 255, 0.9);
    border-radius: 8px;
    font-size: var(--font-size-sm);
    line-height: 1.6;
}

@media (min-width: 768px) {
    .treatment-highlights {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
        gap: var(--spacing-md);
    }
}

/* ============================================
   QUICK LINKS GRID - MOBILE-FIRST
   ============================================ */

.quick-links-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
}

.quick-link-card {
    padding: var(--spacing-lg);
    min-height: var(--touch-target-min);
}

@media (min-width: 480px) {
    .quick-links-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

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

/* ============================================
   CONTENT SECTIONS - MOBILE-FIRST
   ============================================ */

.content-section {
    margin-bottom: var(--spacing-xl);
}

.treatment-content {
    padding: var(--spacing-lg) 0;
}

@media (min-width: 768px) {
    .treatment-content {
        padding: var(--spacing-2xl) 0;
    }
}

@media (min-width: 1024px) {
    .treatment-content {
        padding: var(--spacing-3xl) 0;
    }
}

/* ============================================
   CTA SECTION - MOBILE-FIRST
   ============================================ */

.treatment-cta {
    padding: var(--spacing-xl) 0;
    text-align: center;
}

.cta-content {
    max-width: 600px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

@media (min-width: 768px) {
    .treatment-cta {
        padding: var(--spacing-2xl) 0;
    }
}

/* ============================================
   VIDEO CONTAINERS - RESPONSIVE
   ============================================ */

.video-container {
    position: relative;
    width: 100%;
    padding-bottom: 56.25%; /* 16:9 aspect ratio */
    height: 0;
    overflow: hidden;
    border-radius: 12px;
    margin: var(--spacing-lg) 0;
}

.video-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
    border-radius: 12px;
}

/* ============================================
   LOADING STATES
   ============================================ */

.skeleton {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s infinite;
    border-radius: 8px;
}

@keyframes skeleton-loading {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* ============================================
   IMAGE LOADING PLACEHOLDERS
   ============================================ */

.img-placeholder {
    background: #f5f5f5;
    display: flex;
    align-items: center;
    justify-content: center;
}

img.loading {
    opacity: 0;
}

img.loaded {
    opacity: 1;
    transition: opacity var(--transition-normal) ease;
}

/* ============================================
   LANDSCAPE MOBILE SPECIFIC
   ============================================ */

@media (max-width: 896px) and (orientation: landscape) {
    .hero {
        min-height: auto;
        padding: var(--spacing-lg) 0;
    }
    
    .hero-container {
        flex-direction: row;
    }
    
    .hero-content {
        flex: 1;
    }
    
    .hero-image {
        flex: 0 0 40%;
    }
    
    .hero-image-photo {
        min-height: 200px;
    }
}

/* ============================================
   DARK MODE SUPPORT (for system preference)
   ============================================ */

@media (prefers-color-scheme: dark) {
    /* Only activate if body has dark-mode-enabled class */
    body.dark-mode-enabled {
        background: #1a1a1a;
        color: #ffffff;
    }
    
    body.dark-mode-enabled .navbar {
        background: #1a1a1a;
        border-color: rgba(255, 255, 255, 0.1);
    }
}

/* ============================================
   SMOOTH SCROLL BEHAVIOR
   ============================================ */

html {
    scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }
}

/* ============================================
   TOUCH FEEDBACK IMPROVEMENTS
   ============================================ */

@media (hover: none) and (pointer: coarse) {
    /* Touch device specific styles */
    .btn-primary:active,
    .btn-secondary:active,
    .package-card:active,
    .quick-link-card:active {
        transform: scale(0.98);
        transition: transform 0.1s ease;
    }
    
    /* Disable hover effects on touch devices */
    .btn-primary:hover,
    .btn-secondary:hover {
        transform: none;
    }
}

/* ============================================
   SAFE AREA PADDING (for notched devices)
   ============================================ */

@supports (padding: max(0px)) {
    .navbar {
        padding-left: max(1rem, var(--safe-area-left));
        padding-right: max(1rem, var(--safe-area-right));
    }
    
    .footer {
        padding-left: max(1rem, var(--safe-area-left));
        padding-right: max(1rem, var(--safe-area-right));
        padding-bottom: max(2rem, var(--safe-area-bottom));
    }
}

/* ============================================
   PERFORMANCE: CONTENT VISIBILITY
   ============================================ */

/* Apply content-visibility for off-screen sections */
.section:not(.hero) {
    content-visibility: auto;
    contain-intrinsic-size: 0 500px;
}

.footer {
    content-visibility: auto;
    contain-intrinsic-size: 0 400px;
}

/* ============================================
   MOBILE NAVIGATION - FAILSAFE
   This rule is placed last to ensure it overrides
   any conflicting styles. CRITICAL for mobile UX.
   ============================================ */

@media screen and (max-width: 768px) {
    /* Hamburger menu visibility - CRITICAL */
    .hamburger {
        display: flex !important;
        visibility: visible !important;
        opacity: 1 !important;
        flex-direction: column !important;
        justify-content: center !important;
        align-items: center !important;
        position: relative !important;
        z-index: 1001 !important;
        cursor: pointer !important;
        min-width: 44px !important;
        min-height: 44px !important;
        padding: 8px !important;
        background: transparent !important;
        border: none !important;
        -webkit-tap-highlight-color: transparent !important;
    }
    
    /* Hamburger bars visibility - CRITICAL */
    .hamburger .bar {
        display: block !important;
        visibility: visible !important;
        opacity: 1 !important;
        width: 26px !important;
        height: 3px !important;
        background-color: #1a1a1a !important;
        margin: 4px 0 !important;
        border-radius: 2px !important;
        transition: all 0.3s ease !important;
    }
    
    /* Hamburger active state animations */
    .hamburger.active .bar:nth-child(1) {
        transform: translateY(11px) rotate(45deg) !important;
    }
    
    .hamburger.active .bar:nth-child(2) {
        opacity: 0 !important;
        transform: translateX(-20px) !important;
    }
    
    .hamburger.active .bar:nth-child(3) {
        transform: translateY(-11px) rotate(-45deg) !important;
    }
    
    /* Mobile navigation menu - CLOSED state */
    .nav-menu {
        position: fixed !important;
        top: 70px !important;
        left: -100% !important;
        width: 100% !important;
        height: calc(100vh - 70px) !important;
        background: #ffffff !important;
        z-index: 999 !important;
        display: flex !important;
        flex-direction: column !important;
        transition: left 0.3s ease-in-out !important;
        overflow-y: auto !important;
    }
    
    /* Mobile navigation menu - OPEN state - CRITICAL */
    .nav-menu.active {
        left: 0 !important;
    }
    
    /* Ensure nav links are clickable */
    .nav-menu .nav-link,
    .nav-menu .nav-item a {
        display: flex !important;
        width: 100% !important;
        padding: 18px 24px !important;
        min-height: 56px !important;
        color: #1a1a1a !important;
        text-decoration: none !important;
    }
    
    /* Dropdown menus in mobile */
    .nav-item.dropdown.active .dropdown-menu,
    .nav-item.dropdown.active .mega-menu {
        max-height: 1000px !important;
        padding: 8px 0 !important;
    }
}