*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
    /* Enhanced smooth scrolling */
    scroll-padding-top: var(--header-height);
}

body {
    font-family: var(--font-family-primary);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-normal);
    line-height: var(--line-height-normal);
    color: var(--netflix-white);
    background-color: var(--netflix-black);
    min-height: 100vh;
    min-height: 100dvh; /* Dynamic viewport height for mobile */
    overflow-y: auto;
    overflow-x: hidden;
    -webkit-tap-highlight-color: transparent;
    /* Smooth scrolling for all scrollable elements */
    -webkit-overflow-scrolling: touch;
    overscroll-behavior: contain;
}

body.modal-open,
body.menu-open {
    overflow: hidden;
    position: fixed;
    width: 100%;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: var(--font-weight-bold);
    line-height: var(--line-height-tight);
    margin: 0;
}

h1 { font-size: var(--font-size-5xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }
h5 { font-size: var(--font-size-lg); }
h6 { font-size: var(--font-size-base); }

p {
    margin: 0;
    line-height: var(--line-height-relaxed);
}

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-base);
}

a:hover {
    color: var(--netflix-gray-300);
}

/* Lists */
ul, ol {
    list-style: none;
    margin: 0;
    padding: 0;
}

/* Images */
img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* Buttons */
button {
    font-family: inherit;
    font-size: inherit;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    color: inherit;
    outline: none;
    transition: all var(--transition-base);
}

button:disabled {
    cursor: not-allowed;
    opacity: 0.5;
}

/* Form Elements */
input,
textarea,
select {
    font-family: inherit;
    font-size: inherit;
    color: inherit;
    background: transparent;
    border: none;
    outline: none;
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 12px;
    height: 12px;
}

::-webkit-scrollbar-track {
    background: var(--netflix-black);
}

::-webkit-scrollbar-thumb {
    background: var(--netflix-gray-600);
    border-radius: var(--radius-md);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--netflix-gray-500);
}

/* Firefox Scrollbar */
* {
    scrollbar-width: thin;
    scrollbar-color: var(--netflix-gray-600) var(--netflix-black);
}

/* Selection */
::selection {
    background-color: var(--netflix-red);
    color: var(--netflix-white);
}

::-moz-selection {
    background-color: var(--netflix-red);
    color: var(--netflix-white);
}

/* Container */
.container {
    width: 100%;
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--content-padding);
}

/* Section Spacing */
.section {
    padding: var(--spacing-4xl) 0;
}

/* Utility Classes */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.d-none { display: none !important; }
.d-block { display: block !important; }
.d-inline { display: inline !important; }
.d-inline-block { display: inline-block !important; }
.d-flex { display: flex !important; }
.d-inline-flex { display: inline-flex !important; }
.d-grid { display: grid !important; }

.flex-row { flex-direction: row; }
.flex-column { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.flex-nowrap { flex-wrap: nowrap; }

.justify-start { justify-content: flex-start; }
.justify-end { justify-content: flex-end; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-around { justify-content: space-around; }

.align-start { align-items: flex-start; }
.align-end { align-items: flex-end; }
.align-center { align-items: center; }
.align-stretch { align-items: stretch; }

.gap-xs { gap: var(--spacing-xs); }
.gap-sm { gap: var(--spacing-sm); }
.gap-md { gap: var(--spacing-md); }
.gap-lg { gap: var(--spacing-lg); }
.gap-xl { gap: var(--spacing-xl); }

/* Spacing Utilities */
.m-0 { margin: 0; }
.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }

.p-0 { padding: 0; }
.pt-sm { padding-top: var(--spacing-sm); }
.pt-md { padding-top: var(--spacing-md); }
.pt-lg { padding-top: var(--spacing-lg); }
.pb-sm { padding-bottom: var(--spacing-sm); }
.pb-md { padding-bottom: var(--spacing-md); }
.pb-lg { padding-bottom: var(--spacing-lg); }

/* Text Utilities */
.text-white { color: var(--netflix-white); }
.text-gray { color: var(--netflix-gray-300); }
.text-red { color: var(--netflix-red); }
.text-green { color: var(--netflix-green); }

.font-light { font-weight: var(--font-weight-light); }
.font-normal { font-weight: var(--font-weight-normal); }
.font-medium { font-weight: var(--font-weight-medium); }
.font-semibold { font-weight: var(--font-weight-semibold); }
.font-bold { font-weight: var(--font-weight-bold); }

.text-xs { font-size: var(--font-size-xs); }
.text-sm { font-size: var(--font-size-sm); }
.text-base { font-size: var(--font-size-base); }
.text-lg { font-size: var(--font-size-lg); }
.text-xl { font-size: var(--font-size-xl); }

/* Button Styles */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    cursor: pointer;
    border: none;
    white-space: nowrap;
}

.btn:hover {
    transform: scale(1.05);
}

.btn:active {
    transform: scale(0.98);
}

.btn-primary {
    background-color: var(--netflix-white);
    color: var(--netflix-black);
}

.btn-primary:hover {
    background-color: rgba(255, 255, 255, 0.85);
}

.btn-secondary {
    background-color: rgba(109, 109, 110, 0.7);
    color: var(--netflix-white);
}

.btn-secondary:hover {
    background-color: rgba(109, 109, 110, 0.5);
}

.btn-icon {
    width: 2.5rem;
    height: 2.5rem;
    padding: 0;
    border-radius: var(--radius-full);
    background-color: transparent;
    border: 2px solid rgba(255, 255, 255, 0.5);
    color: var(--netflix-white);
}

.btn-icon:hover {
    background-color: rgba(255, 255, 255, 0.1);
    border-color: var(--netflix-white);
}

.btn-lg {
    padding: var(--spacing-md) var(--spacing-2xl);
    font-size: var(--font-size-lg);
}

.btn-sm {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: var(--font-size-sm);
}

/* Badge */
.badge {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-bold);
    line-height: 1;
    border-radius: var(--radius-sm);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.badge-red {
    background-color: var(--netflix-red);
    color: var(--netflix-white);
}

.badge-outline {
    background-color: transparent;
    border: 1px solid var(--netflix-gray-400);
    color: var(--netflix-gray-300);
}

/* Loading Spinner */
.spinner {
    display: inline-block;
    width: 3rem;
    height: 3rem;
    border: 4px solid rgba(255, 255, 255, 0.1);
    border-top-color: var(--netflix-red);
    border-radius: var(--radius-full);
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Overlay */
.overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.8);
    z-index: var(--z-modal-backdrop);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
}

.overlay.active {
    opacity: 1;
    visibility: visible;
}

/* Animations - Smooth easing */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes fadeInUp {
    0% {
        opacity: 0;
        transform: translateY(20px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInDown {
    0% {
        opacity: 0;
        transform: translateY(-20px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInLeft {
    0% {
        opacity: 0;
        transform: translateX(-100%);
    }
    100% {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInRight {
    0% {
        opacity: 0;
        transform: translateX(100%);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.fade-in { animation: fadeIn var(--transition-base); }
.fade-in-up { animation: fadeInUp var(--transition-slow); }
.fade-in-down { animation: fadeInDown var(--transition-slow); }
.slide-in-left { animation: slideInLeft var(--transition-slow); }
.slide-in-right { animation: slideInRight var(--transition-slow); }
.scale-in { animation: scaleIn var(--transition-base); }

/* Skip to content */
.skip-to-content {
    position: absolute;
    top: -100px;
    left: 0;
    background: var(--netflix-red);
    color: white;
    padding: var(--spacing-md);
    z-index: 9999;
    transition: top var(--transition-base);
}

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

/* Screen reader only */
.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;
}

/* Focus visible */
*:focus-visible {
    outline: 2px solid var(--netflix-white);
    outline-offset: 2px;
}

/* Reduced motion */
@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;
    }
}

/* ==========================================
   SMOOTH SCROLLING ENHANCEMENTS
   ========================================== */

/* Smooth scrolling for all scrollable containers */
.smooth-scroll,
.modal-content,
.slider-wrapper,
.browse-dropdown,
.profile-dropdown,
.notifications-dropdown,
.header-nav {
    scroll-behavior: smooth;
    -webkit-overflow-scrolling: touch;
}

/* Custom scrollbar styling for smoother appearance */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.2);
    border-radius: 4px;
    transition: background 0.3s ease;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.4);
}

/* Hide scrollbar but keep functionality */
.hide-scrollbar {
    -ms-overflow-style: none;
    scrollbar-width: none;
}

.hide-scrollbar::-webkit-scrollbar {
    display: none;
}

/* Firefox smooth scrolling */
@supports (scrollbar-width: thin) {
    * {
        scrollbar-width: thin;
        scrollbar-color: rgba(255, 255, 255, 0.2) transparent;
    }
}

/* GPU acceleration for smooth animations */
.hero,
.card,
.modal,
.header,
.trailer-popup-content {
    will-change: transform;
    transform: translateZ(0);
    backface-visibility: hidden;
}

/* Smooth transitions for interactive elements */
a, button, .card, .nav-link, .hero-btn, .card-action-btn {
    transition: all var(--transition-smooth);
}