:root {
    --primary-blue: #2563eb;
    --primary-dark: #1e40af;
    --primary-light: #3b82f6;
    --secondary-blue: #dbeafe;
    --white: #ffffff;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-600: #4b5563;
    --gray-800: #1f2937;
    --red-500: #ef4444;
    --green-500: #10b981;
    --yellow-500: #f59e0b;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background: var(--gray-50);
    color: var(--gray-800);
}

/* Login Page */
.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-dark) 100%);
}

.login-card {
    background: var(--white);
    border-radius: 1rem;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    padding: 2rem;
    width: 100%;
    max-width: 400px;
}

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

.login-header h2 {
    color: var(--primary-dark);
    font-size: 1.875rem;
    margin-bottom: 0.5rem;
}

.login-header p {
    color: var(--gray-600);
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--gray-700);
}

.form-group input {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--gray-300);
    border-radius: 0.5rem;
    font-size: 1rem;
    transition: all 0.3s;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.btn-primary {
    width: 100%;
    background: var(--primary-blue);
    color: white;
    padding: 0.75rem;
    border: none;
    border-radius: 0.5rem;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.3s;
}

.btn-primary:hover {
    background: var(--primary-dark);
}

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

.sidebar {
    width: 280px;
    background: var(--white);
    box-shadow: 2px 0 8px rgba(0, 0, 0, 0.05);
    position: fixed;
    height: 100vh;
    overflow-y: auto;
}

.sidebar-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--gray-200);
}

.sidebar-header h3 {
    color: var(--primary-blue);
    font-size: 1.25rem;
}

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

.nav-item {
    padding: 0.75rem 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--gray-600);
    text-decoration: none;
    transition: all 0.3s;
}

.nav-item:hover {
    background: var(--secondary-blue);
    color: var(--primary-blue);
}

.nav-item.active {
    background: var(--primary-blue);
    color: white;
}

.main-content {
    flex: 1;
    margin-left: 280px;
}

.top-bar {
    background: var(--white);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.page-title {
    font-size: 1.5rem;
    color: var(--gray-800);
}

.user-info {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.content-wrapper {
    padding: 2rem;
}

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

.stat-card {
    background: var(--white);
    padding: 1.5rem;
    border-radius: 0.75rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.stat-title {
    color: var(--gray-600);
    font-size: 0.875rem;
    margin-bottom: 0.5rem;
}

.stat-value {
    font-size: 2rem;
    font-weight: bold;
    color: var(--gray-800);
}

/* Tables */
.data-table {
    width: 100%;
    background: var(--white);
    border-radius: 0.75rem;
    overflow: hidden;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.data-table thead {
    background: var(--gray-50);
    border-bottom: 1px solid var(--gray-200);
}

.data-table th {
    padding: 1rem;
    text-align: left;
    font-weight: 600;
    color: var(--gray-600);
}

.data-table td {
    padding: 1rem;
    border-bottom: 1px solid var(--gray-200);
}

/* Buttons */
.btn {
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    border: none;
    transition: all 0.3s;
}

.btn-sm {
    padding: 0.25rem 0.5rem;
    font-size: 0.75rem;
}

.btn-success {
    background: var(--green-500);
    color: white;
}

.btn-danger {
    background: var(--red-500);
    color: white;
}

.btn-warning {
    background: var(--yellow-500);
    color: white;
}

/* Alert/Warning for low stock */
.low-stock {
    background: var(--red-500);
    color: white;
    padding: 0.25rem 0.5rem;
    border-radius: 0.25rem;
    font-size: 0.75rem;
    font-weight: 600;
}

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

/* Additional header styles */
.top-bar {
    position: sticky;
    top: 0;
    z-index: 100;
}

/* Sidebar responsive */
.sidebar {
    transition: transform 0.3s ease;
}

@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: 0;
        top: 0;
        transform: translateX(-100%);
        z-index: 1000;
        width: 280px;
        height: 100vh;
        overflow-y: auto;
    }
    
    .sidebar.open {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0 !important;
        width: 100%;
    }
    
    /* Overlay for mobile menu */
    .sidebar-overlay {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(0,0,0,0.5);
        z-index: 999;
        display: none;
    }
    
    .sidebar-overlay.active {
        display: block;
    }
}

/* User avatar colors */
.user-avatar {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-dark) 100%);
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.dropdown-menu.show {
    animation: fadeIn 0.2s ease-out;
}