/* ===== RESET & BASE ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #ff0000;
    --primary-dark: #cc0000;
    --primary-hover: #ff1a1a;
    --bg-dark: #0f0f0f;
    --bg-secondary: #181818;
    --bg-hover: #272727;
    --bg-elevated: #212121;
    --text-primary: #f1f1f1;
    --text-secondary: #aaaaaa;
    --border-color: #303030;
    --sidebar-width: 240px;
    --header-height: 56px;
    --transition: 0.2s ease;
}

body {
    font-family: 'Roboto', 'Segoe UI', Arial, sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.4;
    -webkit-font-smoothing: antialiased;
}

a {
    color: inherit;
    text-decoration: none;
}

button {
    font-family: inherit;
    cursor: pointer;
}

/* ===== HEADER ===== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: var(--bg-secondary);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 16px;
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 16px;
}

.menu-btn {
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.2rem;
    padding: 8px;
    border-radius: 50%;
    transition: background var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
}

.menu-btn:hover {
    background: var(--bg-hover);
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-primary);
    font-weight: bold;
    font-size: 1.3rem;
}

.logo i {
    color: var(--primary);
}

/* Search Bar */
.search-bar {
    display: flex;
    flex: 0 1 728px;
    max-width: 728px;
    margin: 0 32px;
}

.search-bar input {
    width: 100%;
    padding: 10px 16px;
    border: 1px solid var(--border-color);
    border-right: none;
    border-radius: 20px 0 0 20px;
    background: var(--bg-dark);
    color: var(--text-primary);
    font-size: 1rem;
    transition: border-color var(--transition);
}

.search-bar input:focus {
    outline: none;
    border-color: #1c62b9;
}

.search-bar input::placeholder {
    color: var(--text-secondary);
}

.search-btn {
    padding: 0 20px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-left: none;
    border-radius: 0 20px 20px 0;
    color: var(--text-primary);
    transition: background var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.search-btn:hover {
    background: var(--bg-hover);
}

/* Header Right */
.header-right {
    display: flex;
    align-items: center;
    gap: 8px;
}

.icon-btn {
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.1rem;
    padding: 8px;
    border-radius: 50%;
    transition: background var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
}

.icon-btn:hover {
    background: var(--bg-hover);
}

.user-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 0.9rem;
    cursor: pointer;
    transition: transform var(--transition);
}

.user-avatar:hover {
    transform: scale(1.05);
}

/* ===== CONTAINER ===== */
.container {
    display: flex;
    margin-top: var(--header-height);
    min-height: calc(100vh - var(--header-height));
}

/* ===== SIDEBAR ===== */
.sidebar {
    width: var(--sidebar-width);
    background: var(--bg-secondary);
    padding: 12px 0;
    position: fixed;
    left: 0;
    top: var(--header-height);
    bottom: 0;
    overflow-y: auto;
    transition: transform var(--transition);
    z-index: 900;
    scrollbar-width: thin;
    scrollbar-color: var(--border-color) transparent;
}

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

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

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

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

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

.nav-menu {
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-color);
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 24px;
    padding: 12px 24px;
    color: var(--text-primary);
    transition: background var(--transition);
    font-size: 0.95rem;
}

.nav-item:hover,
.nav-item.active {
    background: var(--bg-hover);
}

.nav-item.active {
    border-left: 3px solid var(--primary);
    padding-left: 21px;
}

.nav-item i {
    width: 24px;
    text-align: center;
    font-size: 1.1rem;
}

.sidebar-section {
    padding: 16px 24px;
}

.sidebar-section h3 {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* ===== MAIN CONTENT ===== */
.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    padding: 24px;
    transition: margin-left var(--transition);
}

.main-content.expanded {
    margin-left: 0;
}

/* ===== VIDEO PLAYER ===== */
.video-section {
    margin-bottom: 32px;
}

.video-player {
    background: #000;
    border-radius: 12px;
    overflow: hidden;
}

.video-wrapper {
    position: relative;
    width: 100%;
    max-width: 100%;
    padding-bottom: 56.25%;
    height: 0;
    background: #000;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 8px 24px rgba(0,0,0,0.4);
}

.video-wrapper iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: 0;
    background: #000;
}

/* Loader animation */
.video-wrapper::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 40px;
    height: 40px;
    border: 3px solid var(--bg-hover);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    z-index: 1;
    pointer-events: none;
}

.video-wrapper.loaded::before {
    display: none;
}

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

.video-info h1 {
    font-size: 1.3rem;
    margin-bottom: 12px;
    line-height: 1.3;
    font-weight: 500;
}

.video-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
    padding: 12px 0;
    border-bottom: 1px solid var(--border-color);
}

#videoId {
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-family: 'Courier New', monospace;
    background: var(--bg-hover);
    padding: 4px 10px;
    border-radius: 4px;
}

.video-actions {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.action-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 10px 16px;
    background: var(--bg-secondary);
    border: none;
    border-radius: 20px;
    color: var(--text-primary);
    font-size: 0.9rem;
    transition: background var(--transition), transform var(--transition);
}

.action-btn:hover {
    background: var(--bg-hover);
    transform: translateY(-1px);
}

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

.action-btn.liked {
    color: var(--primary);
}

.action-btn.liked i {
    font-weight: 900;
}

/* ===== VIDEOS GRID ===== */
.videos-grid h2 {
    margin-bottom: 16px;
    font-size: 1.2rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 10px;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 16px;
}

.video-card {
    background: var(--bg-secondary);
    border-radius: 12px;
    overflow: hidden;
    cursor: pointer;
    transition: transform var(--transition), box-shadow var(--transition);
}

.video-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(0,0,0,0.4);
}

.video-card:active {
    transform: translateY(0);
}

.video-thumbnail {
    position: relative;
    aspect-ratio: 16/9;
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.video-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s;
}

.video-card:hover .video-thumbnail img {
    transform: scale(1.05);
}

.video-thumbnail .placeholder-icon {
    font-size: 3rem;
    color: rgba(255,255,255,0.5);
}

.video-duration {
    position: absolute;
    bottom: 8px;
    right: 8px;
    background: rgba(0,0,0,0.85);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 500;
    color: white;
}

.video-card-info {
    padding: 12px;
}

.video-card-title {
    font-weight: 500;
    margin-bottom: 8px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    line-height: 1.3;
    font-size: 0.95rem;
}

.video-card-meta {
    color: var(--text-secondary);
    font-size: 0.85rem;
    display: flex;
    gap: 4px;
}

.video-card-meta span {
    white-space: nowrap;
}

/* ===== MODAL ===== */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.75);
    z-index: 2000;
    align-items: center;
    justify-content: center;
    padding: 16px;
    animation: fadeIn 0.2s;
}

.modal.active {
    display: flex;
}

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

.modal-content {
    background: var(--bg-elevated);
    padding: 24px;
    border-radius: 12px;
    max-width: 500px;
    width: 100%;
    position: relative;
    animation: slideUp 0.3s;
}

@keyframes slideUp {
    from { 
        opacity: 0; 
        transform: translateY(20px); 
    }
    to { 
        opacity: 1; 
        transform: translateY(0); 
    }
}

.close-modal {
    position: absolute;
    top: 12px;
    right: 16px;
    font-size: 1.8rem;
    cursor: pointer;
    color: var(--text-secondary);
    transition: color var(--transition);
    line-height: 1;
}

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

.modal-content h3 {
    margin-bottom: 16px;
    font-weight: 500;
}

.modal-content input {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background: var(--bg-dark);
    color: var(--text-primary);
    margin-bottom: 12px;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
}

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

.copy-btn {
    padding: 10px 24px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 500;
    transition: background var(--transition);
    width: 100%;
}

.copy-btn:hover {
    background: var(--primary-hover);
}

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

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
    .sidebar {
        transform: translateX(-100%);
    }
    .sidebar.active {
        transform: translateX(0);
        box-shadow: 4px 0 20px rgba(0,0,0,0.3);
    }
    .main-content {
        margin-left: 0;
    }
    .menu-btn {
        display: flex;
    }
}

@media (min-width: 1025px) {
    .menu-btn {
        display: none;
    }
}

@media (max-width: 768px) {
    .search-bar {
        display: none;
    }
    
    .grid {
        grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
        gap: 12px;
    }
    
    .video-meta {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .video-actions {
        width: 100%;
        justify-content: flex-start;
    }
    
    .main-content {
        padding: 16px;
    }
    
    .video-info h1 {
        font-size: 1.15rem;
    }
}

@media (max-width: 480px) {
    .grid {
        grid-template-columns: 1fr;
    }
    
    .header {
        padding: 0 12px;
    }
    
    .logo {
        font-size: 1.1rem;
    }
    
    .video-card-title {
        font-size: 0.9rem;
    }
}

/* ===== UTILITIES ===== */
.hidden {
    display: none !important;
}

.fade-in {
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { 
        opacity: 0; 
        transform: translateY(10px); 
    }
    to { 
        opacity: 1; 
        transform: translateY(0); 
    }
}

/* Focus styles for accessibility */
button:focus-visible,
input:focus-visible,
a:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

/* Smooth scroll */
html {
    scroll-behavior: smooth;
}