:root {
    --primary: #008B8B;
    --primary-dark: #006666;
    --primary-light: #20B2AA;
    --secondary: #2C3E50;
    --accent: #00CED1;
    --success: #27AE60;
    --warning: #E67E22;
    --danger: #E74C3C;
    --light: #ECF0F1;
    --dark: #2C3E50;
    --gray: #95A5A6;
    --border: #BDC3C7;
    --card-bg: #FFFFFF;
    --sidebar-bg: #2C3E50;
    --header-bg: #FFFFFF;
    --background: #F8F9FA;
}

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

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

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

/* Sidebar */
.sidebar {
    width: 260px;
    background: var(--sidebar-bg);
    color: white;
    transition: all 0.3s ease;
    box-shadow: 2px 0 10px rgba(0,0,0,0.1);
}

.sidebar-header {
    padding: 1.5rem;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.sidebar-header h1 {
    font-size: 1.5rem;
    font-weight: 600;
    color: white;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

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

.nav-item {
    display: flex;
    align-items: center;
    padding: 0.8rem 1.5rem;
    color: rgba(255,255,255,0.8);
    text-decoration: none;
    transition: all 0.3s ease;
    border-left: 3px solid transparent;
}

.nav-item:hover {
    background: rgba(255,255,255,0.1);
    color: white;
    border-left-color: var(--primary-light);
}

.nav-item.active {
    background: rgba(0,206,209,0.2);
    color: white;
    border-left-color: var(--primary-light);
}

.nav-item i {
    margin-right: 0.8rem;
    font-size: 1.1rem;
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
}

/* Header */
.main-header {
    background: var(--header-bg);
    padding: 1rem 2rem;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 0.8rem;
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 600;
}

/* Content Area */
.content {
    padding: 2rem;
    flex: 1;
}

/* Cards */
.card {
    background: var(--card-bg);
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
    border: 1px solid var(--border);
    margin-bottom: 1.5rem;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(0,0,0,0.12);
}

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

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--dark);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.card-body {
    padding: 1.5rem;
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    padding: 1.5rem;
    border-radius: 12px;
    text-align: center;
}

.stat-card.warning {
    background: linear-gradient(135deg, var(--warning), #D35400);
}

.stat-card.success {
    background: linear-gradient(135deg, var(--success), #219A52);
}

.stat-card.accent {
    background: linear-gradient(135deg, var(--accent), var(--primary));
}

.stat-card.danger {
    background: linear-gradient(135deg, var(--danger), #C0392B);
}

.stat-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.stat-number {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

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

/* Tables */
.table-responsive {
    overflow-x: auto;
    border-radius: 8px;
}

.table {
    width: 100%;
    border-collapse: collapse;
    background: var(--card-bg);
}

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

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

.table tr:hover {
    background: rgba(0,206,209,0.05);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.9rem;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
}

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

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

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

.btn-outline {
    background: transparent;
    border: 1px solid var(--primary);
    color: var(--primary);
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.8rem;
}

.btn-icon {
    padding: 0.5rem;
    border-radius: 6px;
}

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

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

.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 0.9rem;
    transition: all 0.3s ease;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(0,206,209,0.1);
}

.input-group {
    display: flex;
}

.input-group-text {
    background: var(--primary);
    color: white;
    border: 1px solid var(--primary);
    padding: 0.75rem 1rem;
    font-weight: 600;
    border-radius: 8px 0 0 8px;
}

.input-group .form-control {
    border-radius: 0 8px 8px 0;
}

/* Quick Actions */
.quick-actions {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.action-card {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: 12px;
    text-align: center;
    text-decoration: none;
    color: var(--dark);
    transition: all 0.3s ease;
    border: 1px solid var(--border);
}

.action-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
    color: var(--primary);
}

.action-icon {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: var(--primary);
}

/* Product Grid */
.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1.5rem;
}

.product-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.5rem;
    text-align: center;
    transition: all 0.3s ease;
    cursor: pointer;
    position: relative;
}

.product-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
    border-color: var(--primary);
}

.product-card.low-stock {
    border-color: var(--warning);
    background: rgba(230,126,34,0.05);
}

.product-card.out-of-stock {
    border-color: var(--danger);
    background: rgba(231,76,60,0.05);
    opacity: 0.7;
}

.product-image {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-light), var(--primary));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
    color: white;
    font-size: 2rem;
}

.product-name {
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--dark);
}

.product-price {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 0.5rem;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.product-stock {
    font-size: 0.85rem;
    color: var(--gray);
}

.stock-badge {
    position: absolute;
    top: 0.5rem;
    right: 0.5rem;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
}

.stock-badge.low {
    background: var(--warning);
    color: white;
}

.stock-badge.out {
    background: var(--danger);
    color: white;
}

/* Cart */
.cart-container {
    background: var(--card-bg);
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
    position: sticky;
    top: 2rem;
}

.cart-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border);
    background: var(--primary);
    color: white;
    border-radius: 12px 12px 0 0;
}

.cart-items {
    max-height: 400px;
    overflow-y: auto;
}

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

.cart-item:last-child {
    border-bottom: none;
}

.cart-item-info h4 {
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.cart-item-info p {
    color: var(--gray);
    font-size: 0.9rem;
}

.cart-item-actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.quantity-control {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.quantity-btn {
    width: 32px;
    height: 32px;
    border: 1px solid var(--border);
    background: var(--light);
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
}

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

.cart-total {
    padding: 1.5rem;
    border-top: 2px solid var(--border);
    background: var(--light);
    border-radius: 0 0 12px 12px;
}

.total-amount {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
    text-align: center;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

/* Alertas */
.alert {
    padding: 1rem 1.5rem;
    border-radius: 8px;
    margin-bottom: 1.5rem;
    border-left: 4px solid;
}

.alert-warning {
    background: rgba(230,126,34,0.1);
    border-color: var(--warning);
    color: var(--warning);
}

.alert-success {
    background: rgba(39,174,96,0.1);
    border-color: var(--success);
    color: var(--success);
}

.alert-danger {
    background: rgba(231,76,60,0.1);
    border-color: var(--danger);
    color: var(--danger);
}

/* Badges */
.badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
}

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

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

.badge-warning {
    background: var(--warning);
    color: white;
}

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

.badge-accent {
    background: var(--accent);
    color: var(--dark);
}

/* Grid System */
.grid {
    display: grid;
    gap: 1.5rem;
}

.grid-2 {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

/* Moneda Soles */
.moneda-soles {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    font-weight: 600;
}

/* Responsive */
@media (max-width: 1024px) {
    .app-container {
        flex-direction: column;
    }
    
    .sidebar {
        width: 100%;
        height: auto;
    }
    
    .sidebar-nav {
        display: flex;
        overflow-x: auto;
    }
    
    .nav-item {
        white-space: nowrap;
        border-left: none;
        border-bottom: 3px solid transparent;
    }
    
    .nav-item.active {
        border-left: none;
        border-bottom-color: var(--primary-light);
    }
}

@media (max-width: 768px) {
    .content {
        padding: 1rem;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .product-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    }
    
    .main-header {
        padding: 1rem;
        flex-direction: column;
        gap: 1rem;
    }
    
    .grid-2, .grid-3 {
        grid-template-columns: 1fr;
    }
}