:root {
    --bg-color: #0b1120;
    --card-bg: #1e293b;
    --card-hover: #334155;
    --accent-color: #22d3ee;
    --text-color: #f8fafc;
    --text-muted: #94a3b8;
    --border-color: #334155;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    user-select: none;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    height: 100vh;
    overflow: hidden;
}

.app-container {
    display: flex;
    width: 100vw;
    height: 100vh;
}

/* Sidebar Styling / Grid Container */
.sidebar {
    width: 480px;
    background-color: #0f172a;
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    height: 100%;
}

.sidebar-header {
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-color);
}

.sidebar-header h2 {
    font-size: 1.25rem;
    color: var(--accent-color);
}

/* Input Tabs & Panels */
.input-tabs {
    display: flex;
    background: rgba(0,0,0,0.2);
    padding: 6px;
    gap: 6px;
}

.tab-btn {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-muted);
    padding: 6px;
    cursor: pointer;
    font-weight: 600;
    border-radius: 4px;
    transition: all 0.2s;
}

.tab-btn.active {
    background: var(--card-bg);
    color: var(--accent-color);
}

.input-panels-container {
    padding: 10px;
    border-bottom: 1px solid var(--border-color);
}

.input-panel {
    display: none;
}

.input-panel.active {
    display: block;
}

.input-group {
    display: flex;
    gap: 8px;
}

.input-group input[type="text"], .input-group input[type="file"] {
    flex: 1;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 6px 10px;
    border-radius: 6px;
    font-size: 0.85rem;
}

.input-group textarea {
    width: 100%;
    height: 60px;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 6px;
    border-radius: 6px;
    resize: none;
    margin-bottom: 6px;
    font-size: 0.8rem;
}

.input-group button {
    background: var(--accent-color);
    color: #000;
    border: none;
    padding: 0 14px;
    font-weight: 600;
    border-radius: 6px;
    cursor: pointer;
}

/* Filters & Search */
.filter-container {
    padding: 10px;
    display: flex;
    gap: 8px;
    border-bottom: 1px solid var(--border-color);
}

.filter-container input, .filter-container select {
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 6px 10px;
    border-radius: 6px;
    font-size: 0.85rem;
}

.filter-container input {
    flex: 1;
}

/* Channel Thumbnail Grid Area */
.channel-list {
    flex: 1;
    overflow-y: auto;
    padding: 12px;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
    align-content: start;
}

/* Individual Card Styling */
.channel-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 10px;
    display: flex;
    flex-direction: column;
    align-items: center;
    cursor: pointer;
    transition: all 0.2s ease;
}

.channel-card:hover {
    background: var(--card-hover);
    border-color: var(--accent-color);
    transform: translateY(-2px);
}

.channel-card.active {
    background: #1e293b;
    border: 2px solid var(--accent-color);
    box-shadow: 0 0 12px rgba(34, 211, 238, 0.2);
}

.channel-thumb-box {
    width: 100%;
    height: 70px;
    background: #000;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    margin-bottom: 8px;
}

.channel-thumb-box img {
    max-width: 85%;
    max-height: 85%;
    object-fit: contain;
}

.channel-name {
    font-size: 0.8rem;
    font-weight: 500;
    text-align: center;
    color: var(--text-color);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    width: 100%;
}

.empty-state {
    grid-column: span 2;
    text-align: center;
    color: var(--text-muted);
    padding: 30px;
    font-size: 0.9rem;
}

/* Main Video Section */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: #000;
}

.player-wrapper {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

#player {
    width: 100%;
    height: 100%;
}

.now-playing-bar {
    padding: 12px 20px;
    background: var(--card-bg);
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: 10px;
    font-size: 0.95rem;
}

#nowPlayingLabel {
    color: var(--text-muted);
}

#nowPlayingText {
    color: var(--accent-color);
    font-weight: 600;
}