:root {
    --primary-color: #667eea;
    --primary-dark: #764ba2;
    --secondary-color: #f093fb;
    --secondary-dark: #f5576c;
    --success-color: #48bb78;
    --danger-color: #f56565;
    --warning-color: #ed8936;
    --info-color: #4299e1;
    --dark-bg: #1a202c;
    --dark-card: #2d3748;
    --dark-border: #4a5568;
    --text-light: #e2e8f0;
    --text-muted: #a0aec0;
}

* {
    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, var(--dark-bg) 0%, #2d3748 100%);
    color: var(--text-light);
    min-height: 100vh;
    line-height: 1.6;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
}

.navbar {
    background: var(--dark-card);
    border-bottom: 1px solid var(--dark-border);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
    background: rgba(45, 55, 72, 0.95);
}

.navbar-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar-brand {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: var(--text-light);
}

.navbar-brand img {
    height: 40px;
    margin-right: 12px;
}

.navbar-brand span {
    font-size: 1.25rem;
    font-weight: 600;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.navbar-menu a {
    color: var(--text-muted);
    text-decoration: none;
    transition: color 0.3s;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

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

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

.sidebar {
    background: var(--dark-card);
    width: 250px;
    min-height: calc(100vh - 65px);
    padding: 2rem 0;
    border-right: 1px solid var(--dark-border);
    position: fixed;
    overflow-y: auto;
}

.sidebar-menu {
    list-style: none;
}

.sidebar-menu li {
    margin-bottom: 0.25rem;
}

.sidebar-menu a {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.75rem 1.5rem;
    color: var(--text-muted);
    text-decoration: none;
    transition: all 0.3s;
}

.sidebar-menu a:hover {
    background: var(--dark-bg);
    color: var(--primary-color);
    border-left: 3px solid var(--primary-color);
}

.sidebar-menu a.active {
    background: linear-gradient(90deg, rgba(102, 126, 234, 0.1), transparent);
    color: var(--primary-color);
    border-left: 3px solid var(--primary-color);
}

.main-content {
    margin-left: 250px;
    padding: 2rem;
    min-height: calc(100vh - 65px);
}

.card {
    background: var(--dark-card);
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    border: 1px solid var(--dark-border);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--dark-border);
}

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-light);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: linear-gradient(135deg, var(--dark-card), var(--dark-bg));
    border-radius: 12px;
    padding: 1.5rem;
    border: 1px solid var(--dark-border);
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-dark));
}

.stat-card.success::before {
    background: var(--success-color);
}

.stat-card.danger::before {
    background: var(--danger-color);
}

.stat-card.warning::before {
    background: var(--warning-color);
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-light);
    margin-bottom: 0.5rem;
}

.stat-label {
    color: var(--text-muted);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-size: 0.875rem;
    font-weight: 500;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: all 0.3s;
    text-transform: uppercase;
    letter-spacing: 0.025em;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 16px rgba(102, 126, 234, 0.3);
}

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

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

.btn-outline {
    background: transparent;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
}

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

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

.table thead th {
    background: var(--dark-bg);
    color: var(--text-muted);
    font-weight: 600;
    text-align: left;
    padding: 1rem;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-bottom: 2px solid var(--dark-border);
}

.table tbody td {
    padding: 1rem;
    border-bottom: 1px solid var(--dark-border);
    color: var(--text-light);
}

.table tbody tr:hover {
    background: rgba(102, 126, 234, 0.05);
}

.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.025em;
}

.badge-success {
    background: rgba(72, 187, 120, 0.2);
    color: var(--success-color);
}

.badge-danger {
    background: rgba(245, 101, 101, 0.2);
    color: var(--danger-color);
}

.badge-warning {
    background: rgba(237, 137, 54, 0.2);
    color: var(--warning-color);
}

.badge-info {
    background: rgba(66, 153, 225, 0.2);
    color: var(--info-color);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-muted);
    font-size: 0.875rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.025em;
}

.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    background: var(--dark-bg);
    border: 1px solid var(--dark-border);
    border-radius: 8px;
    color: var(--text-light);
    font-size: 1rem;
    transition: all 0.3s;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-control:disabled {
    background: var(--dark-border);
    cursor: not-allowed;
}

.alert {
    padding: 1rem 1.5rem;
    border-radius: 8px;
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.alert-success {
    background: rgba(72, 187, 120, 0.1);
    border: 1px solid rgba(72, 187, 120, 0.3);
    color: var(--success-color);
}

.alert-danger {
    background: rgba(245, 101, 101, 0.1);
    border: 1px solid rgba(245, 101, 101, 0.3);
    color: var(--danger-color);
}

.alert-warning {
    background: rgba(237, 137, 54, 0.1);
    border: 1px solid rgba(237, 137, 54, 0.3);
    color: var(--warning-color);
}

.alert-info {
    background: rgba(66, 153, 225, 0.1);
    border: 1px solid rgba(66, 153, 225, 0.3);
    color: var(--info-color);
}

.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.75);
    z-index: 9999;
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--dark-card);
    border-radius: 12px;
    max-width: 600px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
}

.modal-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--dark-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-body {
    padding: 1.5rem;
}

.modal-footer {
    padding: 1.5rem;
    border-top: 1px solid var(--dark-border);
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--dark-bg);
    border-radius: 4px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-dark));
    border-radius: 4px;
    transition: width 0.3s;
}

.spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid var(--dark-border);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

.login-card {
    background: var(--dark-card);
    border-radius: 16px;
    padding: 3rem;
    width: 100%;
    max-width: 400px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
    border: 1px solid var(--dark-border);
}

.login-logo {
    text-align: center;
    margin-bottom: 2rem;
}

.login-logo img {
    height: 80px;
}

.login-title {
    text-align: center;
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 2rem;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

@media (max-width: 768px) {
    .sidebar {
        display: none;
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .navbar-menu {
        display: none;
    }
}