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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: #f0f0f0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

header {
    background: #1a1a1a;
    color: white;
}

.banner {
    position: relative;
    width: 100%;
    height: 200px;
    overflow: hidden;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

#banner-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.7;
}

.banner-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    color: white;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
}

.banner-text h1 {
    font-size: 3rem;
    margin-bottom: 10px;
}

nav {
    background: #2d2d2d;
    padding: 10px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-left, .nav-right {
    display: flex;
    align-items: center;
    gap: 20px;
}

nav a {
    color: white;
    text-decoration: none;
    padding: 8px 16px;
    border-radius: 4px;
    transition: background 0.3s;
}

nav a:hover {
    background: #444;
}

.btn-login, .btn-register, .btn-logout {
    background: #667eea;
    border: none;
    padding: 8px 20px;
    border-radius: 4px;
    color: white;
    cursor: pointer;
    transition: background 0.3s;
}

.btn-login:hover, .btn-register:hover, .btn-logout:hover {
    background: #764ba2;
}

.btn-register {
    background: #28a745;
}

.btn-register:hover {
    background: #218838;
}

main {
    flex: 1;
    padding: 20px;
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
}

/* Layout principal */
.main-content {
    display: grid;
    grid-template-columns: 3fr 1fr;
    gap: 20px;
}

/* Vídeos */
.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
}

.video-card {
    background: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    transition: transform 0.3s;
    cursor: pointer;
}

.video-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}

.video-thumbnail {
    width: 100%;
    height: 200px;
    background: #ddd;
    position: relative;
}

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

.video-info {
    padding: 15px;
}

.video-info h3 {
    margin-bottom: 10px;
    font-size: 1.1rem;
}

.video-meta {
    color: #666;
    font-size: 0.9rem;
    display: flex;
    justify-content: space-between;
}

/* Sidebar */
.sidebar {
    background: white;
    border-radius: 8px;
    padding: 20px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.sidebar h2 {
    margin-bottom: 20px;
    color: #333;
}

.category-list {
    list-style: none;
}

.category-list li {
    padding: 10px 0;
    border-bottom: 1px solid #eee;
    cursor: pointer;
    transition: color 0.3s;
}

.category-list li:hover {
    color: #667eea;
}

/* Login/Register */
.auth-container {
    max-width: 400px;
    margin: 50px auto;
    background: white;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.auth-container h2 {
    text-align: center;
    margin-bottom: 20px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    color: #333;
}

.form-group input {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
}

.btn-submit {
    width: 100%;
    padding: 12px;
    background: #667eea;
    border: none;
    border-radius: 4px;
    color: white;
    font-size: 1rem;
    cursor: pointer;
    transition: background 0.3s;
}

.btn-submit:hover {
    background: #764ba2;
}

/* Admin */
.admin-panel {
    background: white;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.admin-panel h2 {
    margin-bottom: 30px;
}

.admin-section {
    margin-bottom: 40px;
    padding-bottom: 30px;
    border-bottom: 1px solid #ddd;
}

.admin-section h3 {
    margin-bottom: 20px;
}

/* Video Player */
.video-player-container {
    background: white;
    border-radius: 8px;
    padding: 20px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.video-wrapper {
    position: relative;
    padding-bottom: 56.25%;
    height: 0;
    overflow: hidden;
}

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

/* Comments */
.comments-section {
    margin-top: 30px;
}

.comment {
    background: #f8f9fa;
    padding: 15px;
    border-radius: 4px;
    margin-bottom: 10px;
}

.comment-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 10px;
    color: #666;
}

.comment-pinned {
    background: #fff3cd;
    border-left: 3px solid #ffc107;
}

.comment-form textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    resize: vertical;
    margin-bottom: 10px;
}

/* Responsive */
@media (max-width: 768px) {
    .main-content {
        grid-template-columns: 1fr;
    }
    
    .banner-text h1 {
        font-size: 2rem;
    }
    
    .video-grid {
        grid-template-columns: 1fr;
    }
    
    nav {
        flex-direction: column;
        gap: 10px;
    }
}