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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
}

.card {
    background: white;
    border-radius: 12px;
    padding: 30px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    margin-bottom: 20px;
}

h1 {
    color: #2d3748;
    margin-bottom: 10px;
    font-size: 2.5rem;
}

h2 {
    color: #2d3748;
    margin-bottom: 20px;
    font-size: 1.8rem;
}

h3 {
    color: #4a5568;
    margin-bottom: 15px;
    font-size: 1.3rem;
}

p {
    color: #718096;
    line-height: 1.6;
    margin-bottom: 20px;
}

.btn {
    display: inline-block;
    padding: 12px 24px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-decoration: none;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    font-size: 16px;
    font-weight: 600;
    transition: transform 0.2s, box-shadow 0.2s;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
    background: linear-gradient(135deg, #00f2ea 0%, #00d9ff 100%);
}

.btn-danger {
    background: linear-gradient(135deg, #f56565 0%, #c53030 100%);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin: 20px 0;
}

.stat-card {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 20px;
    border-radius: 10px;
    text-align: center;
}

.stat-value {
    font-size: 2.5rem;
    font-weight: bold;
    margin-bottom: 5px;
}

.stat-label {
    font-size: 0.9rem;
    opacity: 0.9;
}

.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
    margin: 20px 0;
}

.video-card {
    background: white;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: transform 0.2s;
}

.video-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 12px rgba(0, 0, 0, 0.15);
}

.video-thumbnail {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.video-info {
    padding: 15px;
}

.video-title {
    font-weight: 600;
    color: #2d3748;
    margin-bottom: 10px;
}

.video-stats {
    display: flex;
    justify-content: space-around;
    padding: 10px 0;
    border-top: 1px solid #e2e8f0;
    font-size: 0.9rem;
    color: #718096;
}

.loading {
    text-align: center;
    padding: 40px;
    color: #667eea;
}

.spinner {
    border: 4px solid #f3f3f3;
    border-top: 4px solid #667eea;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 0 auto;
}

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

.alert {
    padding: 15px;
    border-radius: 8px;
    margin: 15px 0;
}

.alert-success {
    background: #c6f6d5;
    color: #22543d;
    border: 1px solid #9ae6b4;
}

.alert-error {
    background: #fed7d7;
    color: #742a2a;
    border: 1px solid #fc8181;
}

.alert-info {
    background: #bee3f8;
    color: #2c5282;
    border: 1px solid #90cdf4;
}

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

label {
    display: block;
    margin-bottom: 8px;
    color: #2d3748;
    font-weight: 600;
}

input[type="text"],
input[type="file"],
textarea,
select {
    width: 100%;
    padding: 12px;
    border: 2px solid #e2e8f0;
    border-radius: 8px;
    font-size: 16px;
    transition: border-color 0.2s;
}

input:focus,
textarea:focus,
select:focus {
    outline: none;
    border-color: #667eea;
}

textarea {
    resize: vertical;
    min-height: 100px;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 15px;
    background: #f7fafc;
    border-radius: 8px;
    margin-bottom: 20px;
}

.avatar {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    object-fit: cover;
}

.user-details {
    flex: 1;
}

.user-name {
    font-weight: 600;
    color: #2d3748;
    font-size: 1.2rem;
}

.user-id {
    color: #718096;
    font-size: 0.9rem;
}

.actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

@media (max-width: 768px) {
    h1 {
        font-size: 2rem;
    }

    .stats-grid {
        grid-template-columns: 1fr 1fr;
    }

    .video-grid {
        grid-template-columns: 1fr;
    }
}