:root {
    /* M3 Dark Tonal Palette - Indigo */
    --md-sys-color-primary: #D0BCFF;
    --md-sys-color-on-primary: #381E72;
    --md-sys-color-primary-container: #4F378B;
    --md-sys-color-on-primary-container: #EADDFF;
    --md-sys-color-surface: #1C1B1F;
    --md-sys-color-on-surface: #E6E1E5;
    --md-sys-color-surface-variant: #49454F;
    --md-sys-color-on-surface-variant: #CAC4D0;
    --md-sys-color-outline: #938F99;
    --md-sys-color-outline-variant: #444746;
    --md-sys-color-error: #F2B8B5;

    --md-sys-transition: all 0.2s cubic-bezier(0.2, 0, 0, 1);
    --md-sys-shape-corner-small: 8px;
    --md-sys-shape-corner-medium: 12px;
    --md-sys-shape-corner-large: 16px;
    --md-sys-shape-corner-extra-large: 28px;

    /* Legacy mappings for backward compatibility */
    --bg-dark: var(--md-sys-color-surface);
    --sidebar-bg: var(--md-sys-color-surface);
    --accent-color: var(--md-sys-color-primary);
    --text-main: var(--md-sys-color-on-surface);
    --text-dim: var(--md-sys-color-on-surface-variant);
    --border-color: var(--md-sys-color-outline);
}

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

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-main);
    height: 100dvh;
    overflow: hidden;
}

.app-container {
    display: flex;
    height: 100dvh;
}

/* Material Navigation Drawer */
.sidebar {
    width: 320px;
    background-color: var(--md-sys-color-surface);
    display: flex;
    flex-direction: column;
    border-right: 1px solid var(--md-sys-color-outline-variant);
    transition: var(--md-sys-transition);
    z-index: 110;
    border-radius: 0 var(--md-sys-shape-corner-extra-large) var(--md-sys-shape-corner-extra-large) 0;
}

.sidebar-header {
    padding: 2rem 0 1rem 0;
}

.logo {
    padding: 0 2rem 2rem 2rem;
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -0.025em;
    color: var(--md-sys-color-on-surface);
}

.logo-icon {
    font-size: 1.8rem;
}

.search-box, .filters {
    padding: 0 2rem 1rem 2rem;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

/* M3 Outlined Text Fields */
.search-box input, .filters select {
    width: 100%;
    padding: 12px 16px;
    background: var(--md-sys-color-surface);
    border: 1px solid var(--md-sys-color-outline);
    border-radius: var(--md-sys-shape-corner-small);
    color: var(--md-sys-color-on-surface);
    font-family: inherit;
    font-size: 0.9rem;
    outline: none;
    transition: var(--md-sys-transition);
}

.search-box input:focus, .filters select:focus {
    border: 2px solid var(--md-sys-color-primary);
    padding: 11px 15px; /* Adjust for border thickness */
}

.filters select option {
    background-color: var(--md-sys-color-surface);
    color: var(--md-sys-color-on-surface);
}

.sidebar-navigation {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px;
    padding: 0 2rem 1rem;
}

.site-nav-btn {
    display: flex;
    align-items: center;
    gap: 10px;
    width: calc(100% - 4rem);
    min-height: 46px;
    margin: 0 2rem 1rem;
    padding: 10px 16px;
    border: 1px solid var(--md-sys-color-outline);
    border-radius: var(--md-sys-shape-corner-small);
    background: transparent;
    color: var(--md-sys-color-on-surface-variant);
    cursor: pointer;
    font: inherit;
    font-size: 0.9rem;
    text-align: left;
    text-decoration: none;
    transition: var(--md-sys-transition);
}

.site-nav-btn:hover, .site-nav-btn.active {
    background: var(--md-sys-color-primary-container);
    color: var(--md-sys-color-on-primary-container);
}

.site-nav-btn .material-symbols-outlined {
    font-size: 20px;
}

.channel-list {
    flex: 1;
    overflow-y: auto;
    padding: 0 1rem 2rem 1rem;
}

/* Custom Scrollbar */
.channel-list::-webkit-scrollbar {
    width: 6px;
}

.channel-list::-webkit-scrollbar-track {
    background: transparent;
}

.channel-list::-webkit-scrollbar-thumb {
    background: var(--md-sys-color-outline-variant);
    border-radius: 10px;
}

/* M3 List Items */
.channel-item {
    display: flex;
    align-items: center;
    padding: 12px 16px;
    margin-bottom: 4px;
    border-radius: 100px;
    cursor: pointer;
    transition: var(--md-sys-transition);
    color: var(--md-sys-color-on-surface-variant);
}

.channel-item:hover {
    background: var(--md-sys-color-surface-variant);
    color: var(--md-sys-color-on-surface);
}

.channel-item.active {
    background: var(--md-sys-color-primary-container);
    color: var(--md-sys-color-on-primary-container);
}

.channel-item img {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    margin-right: 12px;
    background: var(--md-sys-color-surface-variant);
    flex-shrink: 0;
    object-fit: cover;
}

.channel-details {
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.channel-name {
    font-weight: 500;
    font-size: 0.95rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.channel-country {
    font-size: 0.75rem;
    color: var(--md-sys-color-on-surface-variant);
    opacity: 0.8;
}

/* Main Viewer Styling */
.viewer {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: #000;
    position: relative;
}

.video-wrapper {
    flex: 1;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #000;
    overflow: hidden;
}


video {
    width: 100%;
    height: 100%;
    max-height: 100%;
    object-fit: contain;
}

/* Custom Material Video Player */
.player-controls {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(transparent, rgba(0,0,0,0.8));
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    opacity: 1;
    transition: opacity 0.3s ease;
    z-index: 10;
}

.player-controls.hidden {
    opacity: 0;
    pointer-events: none;
}

.controls-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 15px;
    color: var(--md-sys-color-on-surface);
}

.control-group {
    display: flex;
    align-items: center;
    gap: 15px;
}

.control-btn {
    background: transparent;
    border: none;
    color: var(--md-sys-color-on-surface);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--md-sys-transition);
    border-radius: 50%;
    width: 40px;
    height: 40px;
}

.control-btn:hover {
    background: rgba(255,255,255,0.1);
}

.control-btn .material-symbols-outlined {
    font-size: 24px;
}

.seek-bar-container {
    display: flex;
    align-items: center;
    gap: 10px;
    width: 100%;
}

.seek-bar {
    flex: 1;
    -webkit-appearance: none;
    background: var(--md-sys-color-surface-variant);
    height: 4px;
    border-radius: 2px;
    cursor: pointer;
    outline: none;
}

.seek-bar::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 12px;
    height: 12px;
    background: var(--md-sys-color-primary);
    border-radius: 50%;
    transition: var(--md-sys-transition);
}

.seek-bar::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

.time-display {
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.85rem;
    min-width: 80px;
}

.video-center-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    pointer-events: none;
    z-index: 5;
}

.playback-ripple {
    width: 80px;
    height: 80px;
    background: var(--md-sys-color-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--md-sys-color-on-primary);
    animation: ripple-out 0.6s ease-out forwards;
}

@keyframes ripple-out {
    0% { transform: scale(0.5); opacity: 1; }
    100% { transform: scale(1.5); opacity: 0; }
}

.channel-nav-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    min-width: 0;
    min-height: 44px;
    padding: 8px 10px;
    border: 1px solid var(--md-sys-color-outline);
    border-radius: var(--md-sys-shape-corner-small);
    background: var(--md-sys-color-surface-variant);
    color: var(--md-sys-color-on-surface);
    cursor: pointer;
    font: inherit;
    font-size: 0.8rem;
    white-space: nowrap;
    transition: var(--md-sys-transition);
}

.channel-nav-btn:hover:not(:disabled) {
    background: var(--md-sys-color-primary-container);
}

.channel-nav-btn:focus-visible {
    outline: 2px solid var(--md-sys-color-primary);
    outline-offset: 2px;
}

.channel-nav-btn:disabled {
    cursor: not-allowed;
    opacity: 0.45;
}

.channel-nav-btn .material-symbols-outlined {
    font-size: 18px;
}

.install-prompt {
    position: fixed;
    right: 24px;
    bottom: 24px;
    z-index: 300;
    display: flex;
    align-items: center;
    gap: 12px;
    width: min(420px, calc(100vw - 32px));
    padding: 14px 16px;
    background: var(--md-sys-color-surface);
    border: 1px solid var(--md-sys-color-outline);
    border-radius: var(--md-sys-shape-corner-medium);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.4);
    animation: install-prompt-in 0.3s ease-out;
}

.install-prompt.hidden {
    display: none;
}

.install-prompt-icon {
    font-size: 1.8rem;
    flex-shrink: 0;
}

.install-prompt-content {
    flex: 1;
    min-width: 0;
}

.install-prompt-content strong {
    display: block;
    color: var(--md-sys-color-on-surface);
    font-size: 0.95rem;
}

.install-prompt-content p {
    margin-top: 3px;
    color: var(--md-sys-color-on-surface-variant);
    font-size: 0.78rem;
    line-height: 1.35;
}

.install-action {
    flex-shrink: 0;
    min-height: 40px;
    padding: 8px 14px;
    border: 0;
    border-radius: var(--md-sys-shape-corner-small);
    background: var(--md-sys-color-primary);
    color: var(--md-sys-color-on-primary);
    cursor: pointer;
    font: inherit;
    font-size: 0.8rem;
    font-weight: 700;
}

.install-dismiss {
    position: absolute;
    top: 4px;
    right: 4px;
    width: 28px;
    height: 28px;
    border: 0;
    background: transparent;
    color: var(--md-sys-color-on-surface-variant);
    cursor: pointer;
}

.install-dismiss .material-symbols-outlined {
    font-size: 18px;
}

@keyframes install-prompt-in {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Empty State */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 3rem 2rem;
    text-align: center;
    color: var(--md-sys-color-on-surface-variant);
}

.empty-state.hidden {
    display: none;
}

.empty-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

.empty-state p {
    font-size: 0.9rem;
    margin-bottom: 1.5rem;
}

.empty-state button {
    padding: 8px 16px;
    background: var(--md-sys-color-surface-variant);
    border: 1px solid var(--md-sys-color-outline);
    color: var(--md-sys-color-on-surface);
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.85rem;
    transition: var(--md-sys-transition);
}

.empty-state button:hover {
    background: var(--md-sys-color-outline);
}

/* Loading Overlay */
.overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.8);
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 100;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid rgba(255,255,255,0.1);
    border-top: 4px solid var(--md-sys-color-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-bottom: 1rem;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Sidebar Footer */
.sidebar-footer {
    padding: 1.5rem 2rem;
    border-top: 1px solid var(--md-sys-color-outline-variant);
    background: rgba(0, 0, 0, 0.1);
}

.dev-info {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.dev-profile {
    display: flex;
    align-items: center;
    gap: 16px;
}

.dev-avatar {
    width: 64px;
    height: 64px;
    border-radius: 16px; /* M3 Medium Corner */
    object-fit: cover;
    border: 2px solid var(--md-sys-color-primary);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.dev-name {
    font-size: 1rem;
    color: var(--md-sys-color-on-surface);
    font-weight: 600;
}

.dev-contact {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding-left: 76px; /* Aligned with the name, skipping avatar + gap */
}

.dev-link {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--md-sys-color-on-surface-variant);
    text-decoration: none;
    font-size: 0.8rem;
    transition: var(--md-sys-transition);
}

.dev-link .material-symbols-outlined {
    font-size: 16px;
}

.dev-link:hover {
    color: var(--md-sys-color-primary);
    transform: translateX(4px);
}

/* Mobile Header */
.mobile-header {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 60px;
    background: var(--md-sys-color-surface);
    border-bottom: 1px solid var(--md-sys-color-outline-variant);
    padding: 0 1rem;
    align-items: center;
    justify-content: space-between;
    z-index: 100;
}

.mobile-logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.mobile-logo .logo-icon {
    font-size: 1.5rem;
}

.mobile-logo h1 {
    font-size: 1.2rem;
    font-weight: 800;
    color: var(--md-sys-color-on-surface);
}

.menu-toggle {
    width: 40px;
    height: 40px;
    background: var(--md-sys-color-surface-variant);
    border: 1px solid var(--md-sys-color-outline);
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 5px;
    transition: var(--md-sys-transition);
}

.menu-toggle span {
    display: block;
    width: 20px;
    height: 2px;
    background: var(--md-sys-color-on-surface);
    transition: var(--md-sys-transition);
}

.menu-toggle:hover {
    background: var(--md-sys-color-outline);
}

.menu-toggle.active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

.menu-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.6);
    backdrop-filter: blur(4px);
    z-index: 50;
    display: none;
    transition: var(--md-sys-transition);
}

.menu-overlay.active {
    display: block;
}

@media (max-width: 768px) {
    .mobile-header {
        display: flex;
    }

    .sidebar {
        position: fixed;
        top: 0;
        left: 0;
        height: 100vh;
        width: 280px;
        transform: translateX(-100%);
        transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        box-shadow: 10px 0 15px rgba(0,0,0,0.3);
        border-radius: 0;
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .app-container {
        padding-top: 60px;
        height: calc(100dvh - 60px);
    }

    .sidebar-navigation {
        gap: 6px;
        padding-left: 1rem;
        padding-right: 1rem;
    }

    .site-nav-btn {
        width: calc(100% - 2rem);
        margin-left: 1rem;
        margin-right: 1rem;
    }

    .channel-nav-btn {
        font-size: 0.75rem;
        gap: 4px;
        padding-left: 6px;
        padding-right: 6px;
    }

    .install-prompt {
        right: 16px;
        bottom: 16px;
        width: calc(100vw - 32px);
    }
}