:root {
    --primary: #4f46e5;
    --primary-dark: #4338ca;
    --primary-light: #818cf8;
    --secondary: #64748b;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --info: #06b6d4;
    --dark: #1e293b;
    --light: #f8fafc;
    --white: #ffffff;
    --sidebar-width: 260px;
    --navbar-height: 64px;
    --border-radius: 12px;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: #f1f5f9;
    color: #334155;
    line-height: 1.6;
    min-height: 100vh;
}

/* Login Page */
.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary) 0%, #8b5cf6 100%);
    padding: 1rem;
}

.login-card {
    background: var(--white);
    padding: 2.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 420px;
    animation: slideUp 0.3s ease-out;
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.login-card .bi-shield-lock {
    color: var(--primary);
}

/* Sidebar */
.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    width: var(--sidebar-width);
    background: linear-gradient(180deg, var(--dark) 0%, #0f172a 100%);
    color: var(--white);
    overflow-y: auto;
    z-index: 1000;
    transition: transform 0.3s ease;
}

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

.sidebar-header h4 {
    margin: 0;
    font-size: 1.25rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

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

.sidebar .nav-link {
    color: rgba(255, 255, 255, 0.7);
    padding: 0.875rem 1.5rem;
    border-radius: 0;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    transition: all 0.2s;
    text-decoration: none;
    font-weight: 500;
}

.sidebar .nav-link:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--white);
}

.sidebar .nav-link.active {
    background: var(--primary);
    color: var(--white);
    border-left: 3px solid var(--primary-light);
}

.sidebar .nav-link i {
    font-size: 1.25rem;
    width: 1.5rem;
    text-align: center;
}

/* Main Content */
.main-content {
    margin-left: var(--sidebar-width);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: margin-left 0.3s ease;
}

.content-wrapper {
    flex: 1;
    padding-bottom: 0;
}

.top-navbar {
    background: var(--white);
    height: var(--navbar-height);
    box-shadow: var(--shadow);
    padding: 0 2rem;
    display: flex;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
}

.top-navbar h5 {
    font-weight: 600;
    color: var(--dark);
}

.content-wrapper {
    padding: 2rem;
}

/* Stat Cards */
.stat-card {
    border-radius: var(--border-radius);
    padding: 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    box-shadow: var(--shadow);
    transition: box-shadow 0.3s ease;
    border: none;
}

.stat-card:hover {
    box-shadow: var(--shadow-lg);
}

.stat-card .stat-icon {
    width: 56px;
    height: 56px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    background: rgba(255, 255, 255, 0.2);
}

.stat-card .stat-content h6 {
    font-size: 0.875rem;
    font-weight: 500;
    opacity: 0.9;
    margin-bottom: 0.25rem;
}

.stat-card .stat-content h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0;
}

/* Cards */
.card {
    border: none;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    background: var(--white);
    margin-bottom: 1.5rem;
    overflow: hidden;
}

.card-header {
    background: var(--white);
    border-bottom: 1px solid #e2e8f0;
    padding: 1.25rem 1.5rem;
    font-weight: 600;
    font-size: 1rem;
}

.card-body {
    padding: 1.5rem;
}

/* Tables */
.table {
    margin-bottom: 0;
}

.table thead th {
    border-bottom: 2px solid #e2e8f0;
    font-weight: 600;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: #64748b;
    padding: 1rem 1.5rem;
    background: #f8fafc;
}

.table tbody td {
    padding: 1rem 1.5rem;
    vertical-align: middle;
    border-bottom: 1px solid #f1f5f9;
}

.table tbody tr:hover {
    background: #f8fafc;
}

/* Buttons */
.btn {
    border-radius: 8px;
    padding: 0.625rem 1.25rem;
    font-weight: 500;
    transition: all 0.2s;
    font-size: 0.875rem;
}

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

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

.btn-outline-primary {
    color: var(--primary);
    border-color: var(--primary);
}

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

.btn-outline-danger {
    color: var(--danger);
    border-color: var(--danger);
}

.btn-outline-danger:hover {
    background: var(--danger);
    border-color: var(--danger);
}

/* Forms */
.form-label {
    font-weight: 500;
    color: #374151;
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
}

.form-control,
.form-select {
    border: 1px solid #e2e8f0;
    border-radius: 8px;
    padding: 0.75rem 1rem;
    transition: all 0.2s;
    font-size: 0.875rem;
}

.form-control:focus,
.form-select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

/* Badges */
.badge {
    padding: 0.4em 0.75em;
    font-weight: 500;
    font-size: 0.75rem;
}

/* Alerts */
.alert {
    border-radius: 8px;
    border: none;
    padding: 1rem 1.25rem;
}

/* Dropdown */
.dropdown-menu {
    border: none;
    box-shadow: var(--shadow-lg);
    border-radius: 8px;
    padding: 0.5rem;
}

.dropdown-item {
    border-radius: 6px;
    padding: 0.625rem 1rem;
    font-size: 0.875rem;
}

/* Sale Items */
.sale-item-row {
    padding: 1.25rem;
    background: #f8fafc;
    border-radius: 10px;
    margin-bottom: 0.75rem;
    border: 1px solid #e2e8f0;
}

/* Mobile Toggle Button */
.mobile-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--dark);
    cursor: pointer;
}

/* Responsive */
@media (max-width: 991.98px) {
    .sidebar {
        transform: translateX(-100%);
    }
    
    .sidebar.show {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .mobile-toggle {
        display: block;
    }
    
    .top-navbar {
        padding: 0 1rem;
    }
    
    .content-wrapper {
        padding: 1rem;
    }
    
    .stat-card {
        padding: 1.25rem;
    }
    
    .stat-card .stat-content h3 {
        font-size: 1.25rem;
    }
}

@media (max-width: 767.98px) {
    .login-card {
        padding: 1.5rem;
    }
    
    .table thead th,
    .table tbody td {
        padding: 0.75rem;
        font-size: 0.875rem;
    }
    
    .card-body {
        padding: 1rem;
    }
    
    .btn {
        padding: 0.5rem 1rem;
        font-size: 0.8125rem;
    }
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: #f1f5f9;
}

::-webkit-scrollbar-thumb {
    background: #cbd5e1;
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: #94a3b8;
}

/* Animations */
.fade-in {
    animation: fadeIn 0.3s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* Page Title */
.page-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 1.5rem;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 3rem 1rem;
    color: #94a3b8;
}

.empty-state i {
    font-size: 3rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

/* Autocomplete */
.customer-autocomplete {
    position: relative;
}

.autocomplete-dropdown {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: white;
    border: 1px solid #e2e8f0;
    border-radius: 8px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    max-height: 300px;
    overflow-y: auto;
    z-index: 9999;
    display: none;
    margin-top: 4px;
    pointer-events: auto;
}

.customer-autocomplete {
    position: relative;
}

.customer-autocomplete .input-group {
    position: relative;
}

.customer-autocomplete .input-group input {
    position: relative;
    z-index: 1;
}

.autocomplete-item {
    padding: 12px 16px;
    cursor: pointer;
    border-bottom: 1px solid #f1f5f9;
    transition: background 0.15s;
    pointer-events: auto;
}

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

.autocomplete-item:hover,
.autocomplete-item.active {
    background: #f8fafc;
}

.autocomplete-section-title {
    padding: 8px 16px 4px;
    font-size: 0.75rem;
    font-weight: 600;
    color: #94a3b8;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.autocomplete-item .customer-name {
    font-weight: 500;
    color: #1e293b;
    margin-bottom: 4px;
}

.autocomplete-item .customer-details {
    display: flex;
    gap: 8px;
    align-items: center;
    font-size: 0.8125rem;
    color: #64748b;
}

.autocomplete-item.no-results {
    color: #94a3b8;
    text-align: center;
    padding: 16px;
}

.invalid-feedback {
    display: none;
    color: var(--danger);
    font-size: 0.875rem;
    margin-top: 0.25rem;
}

.form-control.is-invalid {
    border-color: var(--danger);
}

/* Footer */
.main-footer {
    background: #f8f9fa;
    border-top: 1px solid #e2e8f0;
    padding: 12px 24px;
    margin-top: auto;
    color: #333;
}