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

:root {
    --primary-color: #3498db;
    --secondary-color: #2c3e50;
    --success-color: #27ae60;
    --danger-color: #e74c3c;
    --warning-color: #f39c12;
    --light-color: #ecf0f1;
    --dark-color: #2c3e50;
    --border-color: #bdc3c7;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f5f5f5;
    color: var(--dark-color);
    line-height: 1.6;
}

.navbar {
    background-color: var(--secondary-color);
    color: white;
    padding: 1rem 0;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar-brand a {
    font-size: 1.5rem;
    font-weight: bold;
    color: white;
    text-decoration: none;
}

.navbar-menu {
    list-style: none;
    display: flex;
    gap: 2rem;
}

.navbar-menu a {
    color: white;
    text-decoration: none;
    transition: color 0.3s;
}

.navbar-menu a:hover {
    color: var(--primary-color);
}

.logout-btn {
    background-color: var(--danger-color);
    padding: 0.5rem 1rem;
    border-radius: 4px;
    transition: background-color 0.3s;
}

.logout-btn:hover {
    background-color: #c0392b;
    color: white;
}

.container {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 2rem;
    min-height: calc(100vh - 200px);
}

.footer {
    background-color: var(--secondary-color);
    color: white;
    text-align: center;
    padding: 2rem;
    margin-top: 4rem;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
    text-decoration: none;
    transition: all 0.3s;
    text-align: center;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background-color: #2980b9;
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.btn-secondary {
    background-color: var(--light-color);
    color: var(--dark-color);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background-color: var(--border-color);
}

.btn-small {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Login Page */
.login-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
}

.login-box {
    background: white;
    padding: 3rem;
    border-radius: 8px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
    width: 100%;
    max-width: 400px;
}

.login-box h1 {
    text-align: center;
    color: var(--secondary-color);
    margin-bottom: 0.5rem;
}

.login-subtitle {
    text-align: center;
    color: #7f8c8d;
    margin-bottom: 2rem;
}

.login-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group label {
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--dark-color);
}

.form-group input {
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

.error-message {
    background-color: #fadbd8;
    color: var(--danger-color);
    padding: 1rem;
    border-radius: 4px;
    border-left: 4px solid var(--danger-color);
}

/* Videos Page */
.videos-container {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: var(--shadow);
}

.videos-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.videos-header h1 {
    color: var(--secondary-color);
}

.search-bar {
    display: flex;
    gap: 0.5rem;
}

.search-input {
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 1rem;
    width: 300px;
}

.search-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

.videos-stats {
    background-color: var(--light-color);
    padding: 1rem;
    border-radius: 4px;
    margin-bottom: 2rem;
    display: flex;
    gap: 2rem;
}

.videos-stats p {
    margin: 0;
}

.videos-table-container {
    overflow-x: auto;
    margin-bottom: 2rem;
}

.videos-table {
    width: 100%;
    border-collapse: collapse;
}

.videos-table thead {
    background-color: var(--light-color);
}

.videos-table th {
    padding: 1rem;
    text-align: left;
    font-weight: 600;
    color: var(--dark-color);
    border-bottom: 2px solid var(--border-color);
}

.videos-table td {
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.videos-table tbody tr:hover {
    background-color: #f9f9f9;
}

.video-name {
    font-weight: 500;
    color: var(--primary-color);
    word-break: break-word;
}

.actions {
    display: flex;
    gap: 0.5rem;
}

.loading {
    text-align: center;
    color: #7f8c8d;
    font-style: italic;
}

.no-data {
    text-align: center;
    color: #7f8c8d;
}

.error {
    text-align: center;
    color: var(--danger-color);
}

.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    margin-top: 2rem;
}

#pageInfo {
    font-weight: 500;
    color: var(--dark-color);
}

/* Video Player Page */
.player-container {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: var(--shadow);
}

.video-player {
    margin-bottom: 2rem;
    border-radius: 8px;
    overflow: hidden;
    background: black;
}

#videoPlayer {
    width: 100%;
    height: auto;
    max-height: 600px;
}

.video-info h1 {
    color: var(--secondary-color);
    margin-bottom: 1.5rem;
    word-break: break-word;
}

.video-metadata {
    background-color: var(--light-color);
    padding: 1.5rem;
    border-radius: 4px;
    margin-bottom: 2rem;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem;
}

.metadata-item {
    display: flex;
    flex-direction: column;
}

.metadata-item .label {
    font-weight: 600;
    color: var(--dark-color);
    margin-bottom: 0.25rem;
}

.metadata-item span:last-child {
    color: #7f8c8d;
}

.video-actions {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

/* Error Page */
.error-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

.error-box {
    background: white;
    padding: 3rem;
    border-radius: 8px;
    box-shadow: var(--shadow);
    text-align: center;
    max-width: 500px;
}

.error-box h1 {
    color: var(--danger-color);
    margin-bottom: 1rem;
    font-size: 3rem;
}

.error-box p {
    color: #7f8c8d;
    margin-bottom: 2rem;
}

/* Responsive */
@media (max-width: 768px) {
    .navbar-container {
        padding: 0 1rem;
    }

    .navbar-menu {
        gap: 1rem;
    }

    .container {
        padding: 0 1rem;
    }

    .videos-header {
        flex-direction: column;
        align-items: stretch;
    }

    .search-bar {
        flex-direction: column;
    }

    .search-input {
        width: 100%;
    }

    .videos-stats {
        flex-direction: column;
        gap: 1rem;
    }

    .videos-table {
        font-size: 0.875rem;
    }

    .videos-table th,
    .videos-table td {
        padding: 0.75rem 0.5rem;
    }

    .actions {
        flex-direction: column;
    }

    .login-box {
        padding: 2rem;
    }

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

    .video-actions {
        flex-direction: column;
    }

    .video-actions .btn {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .navbar-brand a {
        font-size: 1.2rem;
    }

    .navbar-menu {
        gap: 0.5rem;
    }

    .navbar-menu a {
        font-size: 0.875rem;
    }

    .videos-header h1 {
        font-size: 1.5rem;
    }

    .search-input {
        width: 100%;
    }

    .pagination {
        flex-wrap: wrap;
    }

    .video-player {
        margin-bottom: 1rem;
    }

    #videoPlayer {
        max-height: 400px;
    }
}