:root {
    /* Color Palette - Premium Dark Theme */
    --color-bg-primary: #0a0a0a;
    --color-bg-secondary: #141414;
    --color-bg-tertiary: #1a1a1a;
    --color-surface: rgba(255, 255, 255, 0.05);
    --color-surface-hover: rgba(255, 255, 255, 0.08);
    
    /* Vibrant Accents - Enhanced contrast */
    --color-accent-primary: #e50914;
    --color-accent-secondary: #ff6b35;
    --color-accent-gradient: linear-gradient(135deg, #e50914 0%, #ff6b35 100%);
    --color-focus-ring: rgba(229, 9, 20, 0.5);
    
    /* Text Colors - Improved contrast */
    --color-text-primary: #ffffff;
    --color-text-secondary: #cccccc;
    --color-text-tertiary: #999999;
    
    /* Glassmorphism */
    --glass-bg: rgba(20, 20, 20, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 0.5rem;
    --radius-md: 1rem;
    --radius-lg: 1.5rem;
    
    /* Transitions - Explicit properties */
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Animation durations */
    --animation-duration: 0.3s;
}

/* Respect user motion preferences */
@media (prefers-reduced-motion: reduce) {
    :root {
        --animation-duration: 0.01ms;
        --transition-fast: 0.01ms;
        --transition-normal: 0.01ms;
        --transition-slow: 0.01ms;
    }
    
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

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

html {
    color-scheme: dark;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--color-bg-primary);
    color: var(--color-text-primary);
    overflow-x: hidden;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    touch-action: manipulation;
    -webkit-tap-highlight-color: rgba(229, 9, 20, 0.2);
}

/* Netflix Style - No Background Animation */
.background-animation {
    display: none;
}

.gradient-orb {
    display: none;
}

/* Screen Management */
.screen {
    position: relative;
    z-index: 1;
    min-height: 100vh;
    display: none;
    opacity: 0;
    transition: opacity var(--transition-slow);
}

.screen.active {
    display: flex;
    animation: fadeIn var(--animation-duration) ease-out forwards;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* Login Screen - Netflix Style (CENTERED) */
#loginScreen {
    justify-content: center;
    align-items: center;
    padding: var(--spacing-md);
    background: #000000;
}

.login-container {
    width: 100%;
    max-width: 450px;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--glass-shadow);
    animation: slideUp 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.logo-container {
    position: fixed;
    top: 0;
    left: 0;
    padding: 28px 50px;
    z-index: 100;
    text-align: left;
    margin-bottom: 0;
}

.logo {
    font-size: 3rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    background: var(--color-accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-xs);
}

.logo-accent {
    font-weight: 300;
}

.tagline {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
    font-weight: 400;
}

/* Form Styles */
.login-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.form-group {
    position: relative;
}

.form-group input {
    width: 100%;
    padding: 1rem 0.75rem;
    background: var(--color-surface);
    border: 2px solid transparent;
    border-radius: var(--radius-sm);
    color: var(--color-text-primary);
    font-size: 1rem;
    font-family: inherit;
    transition: background-color var(--transition-normal), 
                border-color var(--transition-normal),
                box-shadow var(--transition-normal);
}

.form-group input:focus {
    outline: none;
    background: var(--color-surface-hover);
    border-color: var(--color-accent-primary);
}

/* Focus-visible for keyboard navigation */
.form-group input:focus-visible {
    outline: 3px solid var(--color-focus-ring);
    outline-offset: 2px;
    box-shadow: 0 0 0 4px var(--color-focus-ring);
}

.form-group label {
    position: absolute;
    left: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-text-tertiary);
    font-size: 1rem;
    pointer-events: none;
    transition: all var(--transition-fast);
}

.form-group input:focus + label,
.form-group input:not(:placeholder-shown) + label {
    top: -0.5rem;
    font-size: 0.75rem;
    color: var(--color-accent-primary);
    background: var(--color-bg-primary);
    padding: 0 0.5rem;
}

.input-border {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-accent-gradient);
    transition: width var(--transition-normal);
}

.form-group input:focus ~ .input-border {
    width: 100%;
}

/* Button Styles */
.btn-login {
    position: relative;
    width: 100%;
    padding: 1rem;
    background: var(--color-accent-gradient);
    border: none;
    border-radius: var(--radius-sm);
    color: var(--color-text-primary);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    overflow: hidden;
    transition: transform var(--transition-normal),
                box-shadow var(--transition-normal),
                opacity var(--transition-normal);
    touch-action: manipulation;
}

.btn-login:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(229, 9, 20, 0.4);
}

.btn-login:active {
    transform: translateY(0);
}

/* Focus-visible for keyboard navigation */
.btn-login:focus-visible {
    outline: 3px solid var(--color-focus-ring);
    outline-offset: 3px;
    box-shadow: 0 0 0 4px var(--color-focus-ring), 0 10px 30px rgba(229, 9, 20, 0.4);
}

.btn-login::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    transform: translate(-50%, -50%);
    transition: width 0.6s ease-out, height 0.6s ease-out, opacity 0.6s ease-out;
    opacity: 0;
}

.btn-login:active::before {
    width: 300px;
    height: 300px;
    opacity: 1;
}

.btn-text {
    position: relative;
    z-index: 1;
}

.btn-loader {
    display: none;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

.btn-login.loading .btn-text {
    opacity: 0;
}

.btn-login.loading .btn-loader {
    display: block;
}

@keyframes spin {
    to { transform: translate(-50%, -50%) rotate(360deg); }
}

.error-message {
    color: #ff4444;
    font-size: 0.9rem;
    text-align: center;
    padding: var(--spacing-sm);
    background: rgba(255, 68, 68, 0.1);
    border-radius: var(--radius-sm);
    display: none;
}

.error-message.show {
    display: block;
    animation: shake 0.4s;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-10px); }
    75% { transform: translateX(10px); }
}

/* Player Screen */
#playerScreen {
    flex-direction: column;
}

.app-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--glass-border);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    max-width: 1920px;
    margin: 0 auto;
}

.header-logo {
    font-size: 1.5rem;
    font-weight: 700;
}

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

.user-info {
    color: var(--color-text-secondary);
    font-size: 0.9rem;
}

.btn-logout {
    padding: 0.5rem 1.5rem;
    background: var(--color-surface);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    color: var(--color-text-primary);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color var(--transition-fast),
                border-color var(--transition-fast),
                transform var(--transition-fast);
    touch-action: manipulation;
}

.btn-logout:hover {
    background: var(--color-surface-hover);
    border-color: var(--color-accent-primary);
    transform: scale(1.02);
}

.btn-logout:focus-visible {
    outline: 3px solid var(--color-focus-ring);
    outline-offset: 2px;
}

/* Main Content Layout */
.main-content {
    display: flex;
    flex: 1;
    max-width: 1920px;
    margin: 0 auto;
    width: 100%;
}

/* Sidebar */
.sidebar {
    width: 350px;
    background: var(--color-bg-secondary);
    border-right: 1px solid var(--glass-border);
    display: flex;
    flex-direction: column;
    max-height: calc(100vh - 73px);
}

.sidebar-header {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--glass-border);
}

.sidebar-header h3 {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-sm);
}

.search-box {
    position: relative;
}

.search-box input {
    width: 100%;
    padding: 0.75rem 2.5rem 0.75rem 1rem;
    background: var(--color-surface);
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    color: var(--color-text-primary);
    font-size: 0.9rem;
    font-family: inherit;
    transition: background-color var(--transition-fast),
                border-color var(--transition-fast);
}

.search-box input:focus {
    outline: none;
    background: var(--color-surface-hover);
    border-color: var(--color-accent-primary);
}

.search-box input:focus-visible {
    outline: 2px solid var(--color-focus-ring);
    outline-offset: 2px;
}

.search-icon {
    position: absolute;
    right: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-text-tertiary);
    pointer-events: none;
}

/* Channel List */
.channel-list {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-sm);
}

.channel-list::-webkit-scrollbar {
    width: 8px;
}

.channel-list::-webkit-scrollbar-track {
    background: var(--color-bg-secondary);
}

.channel-list::-webkit-scrollbar-thumb {
    background: var(--color-surface);
    border-radius: 4px;
}

.channel-list::-webkit-scrollbar-thumb:hover {
    background: var(--color-surface-hover);
}

.channel-item {
    padding: var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
    background: var(--color-surface);
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background-color var(--transition-fast),
                border-color var(--transition-fast),
                transform var(--transition-fast);
    touch-action: manipulation;
}

.channel-item:hover {
    background: var(--color-surface-hover);
    border-color: var(--color-accent-primary);
    transform: translateX(5px);
}

.channel-item:focus-visible {
    outline: 2px solid var(--color-focus-ring);
    outline-offset: 2px;
    background: var(--color-surface-hover);
}

.channel-item.active {
    background: var(--color-accent-gradient);
    border-color: var(--color-accent-primary);
}

.channel-item h4 {
    font-size: 0.95rem;
    font-weight: 500;
    margin-bottom: 0.25rem;
}

.channel-item p {
    font-size: 0.8rem;
    color: var(--color-text-tertiary);
}

.channel-item.active p {
    color: rgba(255, 255, 255, 0.8);
}

.loading-spinner {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl);
    gap: var(--spacing-md);
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--color-surface);
    border-top-color: var(--color-accent-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

/* Player Container */
.player-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: var(--color-bg-primary);
}

.video-wrapper {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 9;
    background: #000;
    display: flex;
    align-items: center;
    justify-content: center;
}

.player-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
    color: var(--color-text-tertiary);
}

.placeholder-icon {
    opacity: 0.3;
}

.video-player {
    width: 100%;
    height: 100%;
    display: none;
}

.video-player.active {
    display: block;
}

.now-playing {
    padding: var(--spacing-lg);
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--glass-border);
}

.now-playing-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.live-badge {
    padding: 0.25rem 0.75rem;
    background: var(--color-accent-primary);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

#channelName {
    font-size: 1.5rem;
    font-weight: 600;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .sidebar {
        width: 300px;
    }
}

@media (max-width: 768px) {
    .main-content {
        flex-direction: column;
    }
    
    .sidebar {
        width: 100%;
        max-height: 300px;
        border-right: none;
        border-bottom: 1px solid var(--glass-border);
    }
    
    .video-wrapper {
        aspect-ratio: 16 / 9;
    }
    
    .header-content {
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    .header-logo {
        font-size: 1.2rem;
    }
    
    .user-info {
        display: none;
    }
}

@media (max-width: 480px) {
    .login-container {
        padding: var(--spacing-lg);
    }
    
    .logo {
        font-size: 2.5rem;
    }
}