body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: #f8f9fa;
}

/* Layout Principal */
.dashboard-container {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: 250px;
    background: linear-gradient(180deg, #1a1d29 0%, #2d3142 100%);
    color: #fff;
    position: fixed;
    height: 100vh;
    overflow-y: auto;
    box-shadow: 2px 0 10px rgba(0,0,0,0.1);
    z-index: 1000;
    transition: width 0.3s ease;
}

.sidebar.collapsed {
    width: 70px;
}

.sidebar-header {
    padding: 1.5rem 1rem;
    border-bottom: 1px solid rgba(255,255,255,0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
    white-space: nowrap;
    overflow: hidden;
}

.sidebar.collapsed .sidebar-header {
    padding: 1.5rem 0.5rem;
    justify-content: center;
}

.sidebar-header h3, .sidebar-header small {
    transition: opacity 0.3s ease;
}

.sidebar.collapsed .sidebar-header h3, 
.sidebar.collapsed .sidebar-header small {
    display: none;
}

.sidebar-toggle {
    background: none;
    border: none;
    color: rgba(255,255,255,0.6);
    cursor: pointer;
    padding: 0;
    font-size: 1.2rem;
    transition: color 0.3s ease;
}

.sidebar-toggle:hover {
    color: #fff;
}

.sidebar.collapsed .sidebar-toggle {
    margin: 0 auto;
}

.sidebar-nav {
    padding: 1rem 0;
}

.nav-item {
    margin: 0.25rem 0.75rem;
}

.sidebar.collapsed .nav-item {
    margin: 0.25rem 0.5rem;
}

.nav-link {
    display: flex;
    align-items: center;
    padding: 0.75rem 1rem;
    color: rgba(255,255,255,0.8);
    text-decoration: none;
    border-radius: 8px;
    transition: all 0.3s ease;
    font-size: 0.95rem;
    white-space: nowrap;
    overflow: hidden;
}

.sidebar.collapsed .nav-link {
    padding: 0.75rem;
    justify-content: center;
}

.nav-link:hover {
    background: rgba(255,255,255,0.1);
    color: #fff;
    transform: translateX(5px);
}

.sidebar.collapsed .nav-link:hover {
    transform: none;
}

.nav-link.active {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.nav-link i {
    margin-right: 0.75rem;
    font-size: 1.1rem;
    width: 20px;
    text-align: center;
    flex-shrink: 0;
}

.sidebar.collapsed .nav-link i {
    margin-right: 0;
    font-size: 1.3rem;
}

.nav-link span {
    transition: opacity 0.3s ease;
}

.sidebar.collapsed .nav-link span {
    display: none;
}

/* Main Content */
.main-content {
    flex: 1;
    margin-left: 250px;
    padding: 2rem;
    min-height: 100vh;
    transition: margin-left 0.3s ease;
}

.main-content.expanded {
    margin-left: 70px;
}

.page-header {
    margin-bottom: 2rem;
}

.page-header h1 {
    font-size: 2rem;
    font-weight: 600;
    color: #2d3142;
    margin: 0 0 0.5rem 0;
}

.page-header p {
    color: #6c757d;
    margin: 0;
}

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

.stat-card {
    background: #fff;
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.12);
}

.stat-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.stat-card-icon {
    width: 50px;
    height: 50px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.stat-card-icon.primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
}

.stat-card-icon.success {
    background: linear-gradient(135deg, #84fab0 0%, #8fd3f4 100%);
    color: #fff;
}

.stat-card-icon.warning {
    background: linear-gradient(135deg, #ffecd2 0%, #fcb69f 100%);
    color: #fff;
}

.stat-card-value {
    font-size: 2rem;
    font-weight: 700;
    color: #2d3142;
    margin: 0;
}

.stat-card-label {
    color: #6c757d;
    font-size: 0.9rem;
    margin: 0;
}

/* Content Card */
.content-card {
    background: #fff;
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    margin-bottom: 1.5rem;
}

.content-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid #e9ecef;
}

.content-card-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: #2d3142;
    margin: 0;
}

/* Buttons */
.btn-gradient {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border: none;
    color: #fff;
    transition: all 0.3s ease;
}

.btn-gradient:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.4);
    color: #fff;
}

/* Table */
.table-modern {
    border-collapse: separate;
    border-spacing: 0;
}

.table-modern thead th {
    background: #f8f9fa;
    border-bottom: 2px solid #dee2e6;
    font-weight: 600;
    color: #2d3142;
    padding: 1rem;
}

.table-modern tbody tr {
    transition: background-color 0.2s ease;
}

.table-modern tbody tr:hover {
    background-color: #f8f9fa;
}

.table-modern tbody td {
    padding: 1rem;
    vertical-align: middle;
}

/* Image Thumbnail */
.img-thumbnail-modern {
    width: 50px;
    height: 50px;
    object-fit: cover;
    border-radius: 8px;
    border: 2px solid #e9ecef;
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
        transition: transform 0.3s ease;
    }
    
    .sidebar.show {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
        padding: 1rem;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
}

/* Loading Spinner */
.spinner-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
}

.spinner-overlay .spinner-border {
    width: 3rem;
    height: 3rem;
}