/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.container {
    width: 100%;
    max-width: 1200px;
}

/* Login page styles */
.login-box {
    background: white;
    border-radius: 12px;
    padding: 40px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    max-width: 400px;
    margin: 0 auto;
}

.login-box h1 {
    text-align: center;
    color: #333;
    margin-bottom: 10px;
    font-size: 2em;
}

.login-box h2 {
    text-align: center;
    color: #666;
    margin-bottom: 30px;
    font-size: 1.2em;
    font-weight: normal;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: #333;
    font-weight: 500;
}

.form-group input[type="text"],
.form-group input[type="password"] {
    width: 100%;
    padding: 12px;
    border: 2px solid #e0e0e0;
    border-radius: 6px;
    font-size: 14px;
    transition: border-color 0.3s;
}

.form-group input[type="text"]:focus,
.form-group input[type="password"]:focus {
    outline: none;
    border-color: #667eea;
}

.checkbox-group label {
    display: flex;
    align-items: center;
    font-weight: normal;
    cursor: pointer;
}

.checkbox-group input[type="checkbox"] {
    margin-right: 8px;
    width: 18px;
    height: 18px;
    cursor: pointer;
}

.btn-login {
    width: 100%;
    padding: 14px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

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

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

.security-notice {
    margin-top: 20px;
    padding: 12px;
    background: #fff3cd;
    border-left: 4px solid #ffc107;
    border-radius: 4px;
}

.security-notice p {
    font-size: 12px;
    color: #856404;
    margin: 0;
}

/* Alert messages */
.alert {
    padding: 12px 16px;
    border-radius: 6px;
    margin-bottom: 20px;
}

.alert-error {
    background: #f8d7da;
    border: 1px solid #f5c6cb;
    color: #721c24;
}

.alert-success {
    background: #d4edda;
    border: 1px solid #c3e6cb;
    color: #155724;
}

/* Videos page styles */
.header {
    background: white;
    padding: 20px 30px;
    border-radius: 12px;
    margin-bottom: 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.header h1 {
    color: #333;
    font-size: 1.8em;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 15px;
}

.user-info span {
    color: #666;
    font-weight: 500;
}

.btn-logout {
    padding: 8px 20px;
    background: #dc3545;
    color: white;
    text-decoration: none;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
    transition: background 0.3s;
}

.btn-logout:hover {
    background: #c82333;
}

/* Videos grid */
.videos-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(400px, 1fr));
    gap: 25px;
}

.video-card {
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s, box-shadow 0.3s;
}

.video-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.video-header {
    padding: 15px 20px;
    border-bottom: 1px solid #e0e0e0;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.video-header h3 {
    color: #333;
    font-size: 1em;
    font-weight: 600;
    word-break: break-word;
}

.video-size {
    color: #666;
    font-size: 0.85em;
    white-space: nowrap;
}

.video-player {
    width: 100%;
    max-height: 300px;
    background: #000;
}

.video-footer {
    padding: 15px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: #f8f9fa;
}

.video-date {
    color: #666;
    font-size: 0.85em;
}

.btn-download {
    padding: 6px 16px;
    background: #667eea;
    color: white;
    text-decoration: none;
    border-radius: 4px;
    font-size: 0.85em;
    font-weight: 500;
    transition: background 0.3s;
}

.btn-download:hover {
    background: #5568d3;
}

/* No videos message */
.no-videos {
    background: white;
    padding: 60px 40px;
    border-radius: 12px;
    text-align: center;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
}

.no-videos p {
    font-size: 1.2em;
    color: #666;
    margin-bottom: 15px;
}

.no-videos .hint {
    font-size: 0.95em;
    color: #999;
}

.no-videos code {
    background: #f8f9fa;
    padding: 2px 8px;
    border-radius: 4px;
    color: #667eea;
    font-family: 'Courier New', monospace;
}

/* Responsive design */
@media (max-width: 768px) {
    .videos-grid {
        grid-template-columns: 1fr;
    }
    
    .header {
        flex-direction: column;
        align-items: flex-start;
        gap: 15px;
    }
    
    .user-info {
        width: 100%;
        justify-content: space-between;
    }
    
    .login-box {
        padding: 30px 20px;
    }
}

/* Thumbnail styles */
.video-thumbnail-container {
    position: relative;
    width: 100%;
    cursor: pointer;
}

.video-thumbnail {
    width: 100%;
    height: auto;
    border-radius: 8px;
    display: block;
}

.video-thumbnail-container:hover .video-thumbnail {
    transform: scale(1.02);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.play-button-overlay {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 80px;
    height: 80px;
    background: rgba(0, 0, 0, 0.6);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    pointer-events: none;
    transition: background 0.2s;
}

.play-button-overlay::before {
    content: '';
    width: 0;
    height: 0;
    border-left: 25px solid white;
    border-top: 15px solid transparent;
    border-bottom: 15px solid transparent;
    margin-left: 5px;
}

.video-thumbnail-container:hover .play-button-overlay {
    background: rgba(0, 0, 0, 0.8);
}