:root {
    /* Light Theme */
    --primary: #1e90ff;
    --secondary: #ff6f61;
    --bg-light: linear-gradient(135deg, #f5f6f5, #e9ecef);
    --card-bg: #ffffff;
    --text-dark: #2d3436;
    --text-muted: #6b7280;
    --shadow: 0 6px 18px rgba(0, 0, 0, 0.08);
    --border: #e2e8f0;
    --highlight: rgba(30, 144, 255, 0.15);
    --button-hover: #0066cc;
    --accent-gradient: linear-gradient(90deg, var(--primary), var(--secondary));

    /* Dark Theme */
    --dark-bg: linear-gradient(135deg, #1a1a1a, #2d3748);
    --dark-card: #2d2d2d;
    --dark-text: #e2e8f0;
    --dark-muted: #94a3b8;
    --dark-shadow: 0 6px 18px rgba(0, 0, 0, 0.3);
    --dark-border: #4b5563;
    --dark-highlight: rgba(30, 144, 255, 0.25);
    --dark-button-hover: #60a5fa;
}

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

body, html {
    height: 100%;
    font-family: 'Inter', sans-serif;
    background: var(--bg-light);
    color: var(--text-dark);
    overflow: hidden;
    transition: background 0.5s ease, color 0.3s ease;
}

body.dark {
    background: var(--dark-bg);
    color: var(--dark-text);
}

body.dark .sidebar,
body.dark .epg-guide,
body.dark .video-container,
body.dark .channel-item,
body.dark .upload-modal-content {
    background: var(--dark-card);
    border-color: var(--dark-border);
    box-shadow: var(--dark-shadow);
}

body.dark #searchInput,
body.dark .upload-section input[type="file"],
body.dark .upload-section input[type="text"] {
    background: #374151;
    border-color: var(--dark-border);
    color: var(--dark-text);
}

.container {
    display: flex;
    height: 100vh;
    overflow: hidden;
    position: relative;
    transition: all 0.4s ease;
}

.sidebar {
    width: 320px;
    max-width: 100%;
    background: var(--card-bg);
    border-right: 1px solid var(--border);
    box-shadow: var(--shadow);
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 10;
    display: flex;
    flex-direction: column;
    position: absolute;
    height: 100%;
}

.sidebar.hidden {
    transform: translateX(-100%);
}

.sidebar.hidden + .main-content {
    width: 100%;
    padding: 0;
}

.sidebar-header {
    padding: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    background: inherit;
    z-index: 11;
    border-bottom: 1px solid var(--border);
}

.sidebar-logo {
    width: clamp(6rem, 20vw, 8rem);
    height: auto;
    object-fit: contain;
}

.sidebar-controls {
    display: flex;
    gap: 0.5rem;
}

.sidebar-button {
    background: none;
    border: none;
    font-size: clamp(1rem, 4vw, 1.125rem);
    cursor: pointer;
    color: var(--text-muted);
    transition: color 0.3s, transform 0.3s;
}

body.dark .sidebar-button {
    color: var(--dark-muted);
}

.sidebar-button:hover {
    color: var(--primary);
    transform: scale(1.1);
}

.stats-container {
    padding: 0.5rem 1rem;
    font-size: clamp(0.75rem, 3vw, 0.875rem);
    color: var(--text-muted);
    position: sticky;
    top: clamp(3rem, 10vw, 3.8125rem);
    background: inherit;
    z-index: 11;
    border-bottom: 1px solid var(--border);
}

.stats-container span {
    cursor: pointer;
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    transition: background 0.3s, color 0.3s;
}

.stats-container span:hover {
    background: var(--highlight);
    color: var(--primary);
}

body.dark .stats-container {
    color: var(--dark-muted);
}

body.dark .stats-container span:hover {
    background: var(--dark-highlight);
    color: var(--dark-button-hover);
}

.search-container {
    padding: 0.75rem 1rem;
    position: sticky;
    top: clamp(4.5rem, 15vw, 5.6875rem);
    background: inherit;
    z-index: 11;
}

#searchInput {
    width: 100%;
    padding: 0.625rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: clamp(0.875rem, 3.5vw, 1rem);
    background: var(--bg-light);
    transition: border-color 0.3s, box-shadow 0.3s, background 0.3s;
}

#searchInput:focus {
    border-color: var(--primary);
    box-shadow: 0 0 8px var(--highlight);
    outline: none;
}

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

.main-content {
    flex: 1;
    padding: 1.5625rem;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    transition: all 0.4s ease;
    width: 100%;
}

.main-content.no-playlist {
    padding: 0;
}

.epg-guide {
    background: var(--card-bg);
    padding: 1.25rem;
    border-radius: 10px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    display: none;
}

.epg-guide.visible {
    display: block;
}

.epg-timeline {
    height: 6px;
    background: var(--border);
    border-radius: 3px;
    margin-top: 0.625rem;
    position: relative;
}

.epg-progress {
    height: 100%;
    background: var(--primary);
    border-radius: 3px;
    transition: width 0.3s ease;
}

body.dark .epg-progress {
    background: var(--dark-button-hover);
}

.epg-current {
    font-size: clamp(1rem, 4vw, 1.125rem);
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 0.5rem;
}

.epg-next, .epg-time {
    font-size: clamp(0.875rem, 3.5vw, 1rem);
    color: var(--text-muted);
}

body.dark .epg-next,
body.dark .epg-time {
    color: var(--dark-muted);
}

.video-container {
    position: relative;
    flex: 1;
    background: #000;
    border-radius: 12px;
    overflow: hidden;
    transition: border-radius 0.4s ease, border 0.4s ease, box-shadow 0.4s ease;
}

.sidebar.hidden + .main-content .video-container,
.video-container:fullscreen,
.main-content.no-playlist .video-container {
    border-radius: 0;
    border: none;
    box-shadow: none;
}

#videoPlayer {
    width: 100%;
    height: 100%;
    object-fit: contain;
    border-radius: inherit;
}

.channel-group h3 {
    font-size: clamp(1rem, 4vw, 1.125rem);
    font-weight: 600;
    color: var(--primary);
    margin: 1.25rem 0 0.625rem;
}

.channel-item {
    padding: 0.75rem 0.9375rem;
    margin: 0.3125rem 0;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s ease;
    border: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    overflow: hidden;
    white-space: nowrap;
}

.channel-item:hover {
    background: var(--highlight);
    transform: translateX(3px);
}

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

.channel-info {
    display: flex;
    align-items: center;
    gap: 0.625rem;
    overflow: hidden;
}

.channel-logo {
    width: clamp(1.5rem, 6vw, 1.75rem);
    height: clamp(1.5rem, 6vw, 1.75rem);
    object-fit: contain;
    flex-shrink: 0;
}

.channel-title {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-size: clamp(0.875rem, 3.5vw, 1rem);
}

.favorite-btn {
    background: none;
    border: none;
    font-size: clamp(1rem, 4vw, 1.125rem);
    cursor: pointer;
    color: var(--text-muted);
    transition: color 0.3s;
}

body.dark .favorite-btn {
    color: var(--dark-muted);
}

.favorite-btn.favorited {
    color: var(--secondary);
}

.favorite-btn:hover {
    color: var(--primary);
}

::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: var(--bg-light);
}

body.dark ::-webkit-scrollbar-track {
    background: var(--dark-bg);
}

::-webkit-scrollbar-thumb {
    background: var(--primary);
    border-radius: 3px;
}

body.dark ::-webkit-scrollbar-thumb {
    background: var(--dark-button-hover);
}

.control-panel {
    position: absolute;
    top: 0.9375rem;
    right: 0.9375rem;
    display: flex;
    gap: 0.625rem;
    z-index: 100;
    opacity: 0;
    transition: opacity 0.3s;
}

.video-container:hover .control-panel {
    opacity: 1;
}

.control-button {
    width: clamp(2rem, 8vw, 2.25rem);
    height: clamp(2rem, 8vw, 2.25rem);
    background: var(--primary);
    color: #fff;
    border: none;
    border-radius: 50%;
    font-size: clamp(0.875rem, 3.5vw, 1rem);
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow);
}

body.dark .control-button {
    background: var(--dark-button-hover);
    box-shadow: var(--dark-shadow);
}

.control-button:hover {
    background: var(--button-hover);
    transform: scale(1.1);
}

body.dark .control-button:hover {
    background: #93c5fd;
}

.control-button:active {
    transform: scale(0.9);
}

.notification {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    padding: 0.9375rem 1.5625rem;
    border-radius: 8px;
    font-weight: 600;
    background: rgba(0, 0, 0, 0.8);
    color: #fff;
    z-index: 2000;
    opacity: 0;
    transition: opacity 0.3s ease;
    max-width: 80%;
    text-align: center;
    font-size: clamp(0.875rem, 3.5vw, 1rem);
}

body.dark .notification {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(4px);
}

.notification.show {
    opacity: 1;
}

.loading-indicator {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: clamp(2rem, 8vw, 2.5rem);
    height: clamp(2rem, 8vw, 2.5rem);
    border: 4px solid var(--primary);
    border-top: 4px solid transparent;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    z-index: 1000;
    opacity: 0;
    transition: opacity 0.3s ease;
}

body.dark .loading-indicator {
    border-color: var(--dark-button-hover);
}

.loading-indicator.show {
    opacity: 1;
}

.upload-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('https://buddytv.netlify.app/img/default-bg.webp') no-repeat center/cover;
    z-index: 2000;
    display: none;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(5px);
    opacity: 0;
    transition: opacity 0.5s ease;
}

body.dark .upload-modal {
    background: url('https://buddytv.netlify.app/img/default-bg.webp') no-repeat center/cover;
}

.upload-modal.show {
    display: flex;
    opacity: 1;
}

.upload-modal-content {
    background: var(--card-bg);
    padding: 1.25rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
    width: clamp(18rem, 90vw, 28.125rem);
    max-width: 90%;
    border: 1px solid var(--border);
    position: relative;
    transition: background 0.3s ease, border-color 0.3s ease;
}

.upload-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.25rem;
}

.upload-header h3 {
    font-size: clamp(1.25rem, 5vw, 1.5rem);
    font-weight: 600;
    color: var(--primary);
}

.upload-close {
    background: none;
    border: none;
    font-size: clamp(1rem, 4vw, 1.125rem);
    cursor: pointer;
    color: var(--text-muted);
    transition: color 0.3s;
}

body.dark .upload-close {
    color: var(--dark-muted);
}

.upload-close:hover {
    color: var(--primary);
}

.upload-section {
    margin-bottom: 1.25rem;
}

.upload-section label {
    display: block;
    font-size: clamp(0.875rem, 3.5vw, 1rem);
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
}

body.dark .upload-section label {
    color: var(--dark-text);
}

.upload-section input[type="file"],
.upload-section input[type="text"] {
    width: 100%;
    padding: 0.625rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: clamp(0.875rem, 3.5vw, 1rem);
    background: var(--bg-light);
    transition: border-color 0.3s, background 0.3s;
}

.upload-section input:focus {
    border-color: var(--primary);
    outline: none;
}

.upload-buttons {
    display: flex;
    gap: 0.625rem;
    margin-top: 0.625rem;
    flex-wrap: wrap;
}

.upload-section button {
    padding: 0.625rem 1.25rem;
    background: var(--primary);
    color: #fff;
    border: none;
    border-radius: 6px;
    font-size: clamp(0.875rem, 3.5vw, 1rem);
    font-weight: 600;
    cursor: pointer;
    transition: background 0.3s ease;
    flex: 1;
    min-width: 0;
}

body.dark .upload-section button {
    background: var(--dark-button-hover);
}

.upload-section button:hover {
    background: var(--button-hover);
}

body.dark .upload-section button:hover {
    background: #93c5fd;
}

.upload-section button:disabled {
    background: var(--text-muted);
    cursor: not-allowed;
}

body.dark .upload-section button:disabled {
    background: var(--dark-muted);
}

#clearHistoryButton {
    background: var(--secondary);
}

body.dark #clearHistoryButton {
    background: #f87171;
}

#clearHistoryButton:hover {
    background: #e65a4e;
}

body.dark #clearHistoryButton:hover {
    background: #fca5a5;
}

.upload-history {
    margin-top: 1.25rem;
    max-height: 9.375rem;
    overflow-y: auto;
    border-top: 1px solid var(--border);
    padding-top: 0.625rem;
}

.upload-history-item {
    font-size: clamp(0.8125rem, 3.25vw, 0.875rem);
    color: var(--text-muted);
    padding: 0.3125rem 0;
    word-break: break-all;
    cursor: pointer;
    transition: color 0.3s;
}

body.dark .upload-history-item {
    color: var(--dark-muted);
}

.upload-history-item:hover {
    color: var(--primary);
}

@media (max-width: 768px) {
    .sidebar {
        width: 80vw;
        max-width: 280px;
    }
    .main-content {
        padding: 0.625rem;
    }
    .sidebar:not(.hidden) + .main-content {
        pointer-events: none;
        opacity: 0.5;
    }
}

@media (orientation: landscape) and (max-width: 1024px) {
    .sidebar {
        width: 40vw;
        max-width: 320px;
    }
    .main-content {
        padding: 1rem;
    }
}

@media (orientation: portrait) and (max-width: 768px) {
    .sidebar {
        width: 90vw;
        max-width: 280px;
    }
    .main-content {
        padding: 0.5rem;
    }
}

@keyframes spin {
    0% { transform: translate(-50%, -50%) rotate(0deg); }
    100% { transform: translate(-50%, -50%) rotate(360deg); }
}