:root {
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --bg-color: #f3f4f6;
    --card-bg: #ffffff;
    --text-main: #111827;
    --text-muted: #6b7280;
    --border-color: #e5e7eb;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg-color: #111827;
        --card-bg: #1f2937;
        --text-main: #f9fafb;
        --text-muted: #9ca3af;
        --border-color: #374151;
    }
}

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

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

/* Glassmorphism Navigation */
.navbar {
    background: rgba(var(--card-bg), 0.8);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 50;
    padding: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--primary);
    text-decoration: none;
}

.nav-links a {
    color: var(--text-muted);
    text-decoration: none;
    margin-left: 1rem;
    font-size: 0.95rem;
    transition: color 0.2s;
}

.nav-links a:hover, .nav-links a.active {
    color: var(--primary);
}

/* Data Grid Container */
.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 1.5rem 1rem;
}

/* Card */
.card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
    overflow: hidden;
}

.card-header {
    padding: 1.25rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.card-title {
    font-size: 1.125rem;
    font-weight: 600;
}

.card-body {
    padding: 1.25rem;
}

/* Modern Data Table */
.data-table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
    font-size: 0.9rem;
}

.data-table th, .data-table td {
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border-color);
}

.data-table th {
    background-color: rgba(0,0,0,0.02);
    font-weight: 600;
    color: var(--text-muted);
    white-space: nowrap;
}

.data-table tr:hover {
    background-color: rgba(0,0,0,0.01);
}

@media (prefers-color-scheme: dark) {
    .data-table th { background-color: rgba(255,255,255,0.02); }
    .data-table tr:hover { background-color: rgba(255,255,255,0.01); }
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: 0.375rem;
    border: 1px solid transparent;
    cursor: pointer;
    transition: all 0.2s;
}

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

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

.btn-outline {
    background-color: transparent;
    border-color: var(--border-color);
    color: var(--text-main);
}

.btn-outline:hover {
    background-color: rgba(0,0,0,0.02);
}

/* Inputs */
.input {
    width: 100%;
    padding: 0.5rem 0.75rem;
    font-size: 0.875rem;
    border: 1px solid var(--border-color);
    border-radius: 0.375rem;
    background-color: var(--card-bg);
    color: var(--text-main);
    transition: border-color 0.2s;
}

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

.input-sm {
    padding: 0.25rem 0.5rem;
    width: 80px;
}

/* Floating Cart Drawer */
.cart-drawer {
    position: fixed;
    right: -400px;
    top: 0;
    width: 400px;
    max-width: 100vw;
    height: 100vh;
    background-color: var(--card-bg);
    box-shadow: -4px 0 15px rgba(0,0,0,0.1);
    transition: right 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 100;
    display: flex;
    flex-direction: column;
}

.cart-drawer.open {
    right: 0;
}

.cart-overlay {
    position: fixed;
    inset: 0;
    background-color: rgba(0,0,0,0.5);
    backdrop-filter: blur(2px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s;
    z-index: 90;
}

.cart-overlay.open {
    opacity: 1;
    pointer-events: auto;
}

.cart-header {
    padding: 1.25rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.cart-body {
    flex: 1;
    overflow-y: auto;
    padding: 1.25rem;
}

.cart-footer {
    padding: 1.25rem;
    border-top: 1px solid var(--border-color);
    background-color: var(--bg-color);
}

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

.cart-item-title {
    font-weight: 500;
    margin-bottom: 0.25rem;
}

.cart-item-spec {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* Mobile Responsive Adjustments */
@media (max-width: 768px) {
    .data-table thead {
        display: none;
    }
    
    .data-table tr {
        display: block;
        padding: 1rem;
        border-bottom: 1px solid var(--border-color);
    }
    
    .data-table td {
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: 0.25rem 0;
        border: none;
    }
    
    .data-table td::before {
        content: attr(data-label);
        font-weight: 600;
        color: var(--text-muted);
    }
    
    .nav-links {
        display: none;
    }
}

/* Utilities */
.text-success { color: var(--success); }
.text-danger { color: var(--danger); }
.text-warning { color: var(--warning); }
.font-bold { font-weight: 700; }
.mt-4 { margin-top: 1rem; }
.mb-4 { margin-bottom: 1rem; }
.flex { display: flex; }
.justify-between { justify-content: space-between; }
.items-center { align-items: center; }
.gap-2 { gap: 0.5rem; }