:root {
    --primary-color: #2A3C78;
    --primary-dark: #b00316;
    --primary-light: #ff1a33;
    --sidebar-width: 260px;
    --sidebar-collapsed-width: 80px;
    --topbar-height: 70px;
    --bg-light: #f8f9fa;
    --bg-white: #ffffff;
    --text-primary: #1a1a1a;
    --text-secondary: #6c757d;
    --border-color: #e9ecef;
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15);
}

/* Corporate Font */
* {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-weight: 400;
    color: var(--text-primary);
    background-color: var(--bg-light);
    line-height: 1.6;
}

/* Sidebar Styles */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    width: var(--sidebar-width);
    background: linear-gradient(180deg, #1a1a1a 0%, #2d2d2d 100%);
    color: #ffffff;
    z-index: 1000;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-lg);
    transition: transform 0.3s ease;
}

.sidebar-header {
    padding: 1.5rem 1.25rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.sidebar-brand {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: #ffffff;
    font-weight: 600;
    font-size: 1.1rem;
}

.sidebar-brand:hover {
    color: #ffffff;
}

.brand-text {
    font-weight: 600;
    letter-spacing: -0.5px;
}

.sidebar-toggle {
    background: none;
    border: none;
    color: #ffffff;
    font-size: 1.25rem;
    cursor: pointer;
    padding: 0.5rem;
}

.sidebar-nav {
    flex: 1;
    overflow-y: auto;
    padding: 1rem 0;
}

.nav-menu {
    list-style: none;
    padding: 0;
    margin: 0;
}

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

.nav-link {
    display: flex;
    align-items: center;
    padding: 0.75rem 1rem;
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    border-radius: 8px;
    transition: all 0.2s ease;
    font-weight: 500;
    font-size: 0.95rem;
}

.nav-link i {
    font-size: 1.25rem;
    margin-right: 0.75rem;
    width: 24px;
    text-align: center;
}

.nav-link:hover {
    background-color: rgba(255, 255, 255, 0.1);
    color: #ffffff;
}

.nav-link.active {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: #ffffff;
    box-shadow: 0 4px 12px rgba(218, 4, 27, 0.3);
}

.sidebar-footer {
    padding: 1.25rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.user-profile {
    display: flex;
    align-items: center;
    flex: 1;
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 0.75rem;
    font-size: 1.5rem;
    color: #ffffff;
}

.user-info {
    flex: 1;
}

.user-name {
    font-weight: 600;
    font-size: 0.9rem;
    color: #ffffff;
}

.user-role {
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.6);
}

.logout-btn {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: all 0.2s ease;
    font-size: 1.1rem;
}

.logout-btn:hover {
    background-color: rgba(255, 255, 255, 0.1);
    color: #ffffff;
}

/* Main Wrapper */
.main-wrapper {
    margin-left: var(--sidebar-width);
    min-height: 100vh;
    transition: margin-left 0.3s ease;
}

/* Top Bar */
.topbar {
    height: var(--topbar-height);
    background: var(--bg-white);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    padding: 0 2rem;
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
}

.sidebar-toggle-mobile {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-primary);
    margin-right: 1rem;
    padding: 0.5rem;
    display: none;
}

.topbar-title {
    flex: 1;
}

.page-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin: 0;
    color: var(--text-primary);
    letter-spacing: -0.5px;
}

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

/* Main Content */
.main-content {
    padding: 2rem;
    min-height: calc(100vh - var(--topbar-height));
}

/* Cards - Enhanced Design */
.card {
    border: none;
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    margin-bottom: 1.5rem;
    background: var(--bg-white);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.card-header {
    background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 100%);
    border-bottom: 1px solid var(--border-color);
    font-weight: 600;
    padding: 1.25rem 1.5rem;
    border-radius: 12px 12px 0 0;
    font-size: 1rem;
    color: var(--text-primary);
}

.card-body {
    padding: 1.5rem;
}

/* Stats Cards */
.card.text-white {
    border-radius: 16px;
    overflow: hidden;
    position: relative;
}

.card.text-white::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 100px;
    height: 100px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    transform: translate(30%, -30%);
}

.card.text-white .card-body {
    position: relative;
    z-index: 1;
}

.card.text-white h6 {
    font-weight: 500;
    opacity: 0.9;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.card.text-white h2 {
    font-weight: 700;
    font-size: 2rem;
    margin: 0.5rem 0 0;
    letter-spacing: -1px;
}

/* Buttons - Enhanced */
.btn {
    border-radius: 8px;
    font-weight: 500;
    padding: 0.625rem 1.25rem;
    transition: all 0.2s ease;
    letter-spacing: 0.3px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    border: none;
    box-shadow: 0 4px 12px rgba(218, 4, 27, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(218, 4, 27, 0.4);
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--primary-color) 100%);
}

.btn-outline-primary {
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
    background: transparent;
}

.btn-outline-primary:hover {
    background: var(--primary-color);
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(218, 4, 27, 0.3);
}

/* Forms - Enhanced */
.form-control,
.form-select {
    border-radius: 8px;
    border: 1px solid var(--border-color);
    padding: 0.75rem 1rem;
    font-size: 0.95rem;
    transition: all 0.2s ease;
}

.form-control:focus,
.form-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(218, 4, 27, 0.15);
    outline: none;
}

.form-label {
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
}

/* Tables - Enhanced */
.table {
    font-size: 0.95rem;
    margin-bottom: 0;
}

.table thead th {
    background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 100%);
    border-bottom: 2px solid var(--border-color);
    font-weight: 600;
    color: var(--text-primary);
    text-transform: uppercase;
    font-size: 0.8rem;
    letter-spacing: 0.5px;
    padding: 1rem;
}

.table tbody td {
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    vertical-align: middle;
}

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

.table tbody tr:last-child td {
    border-bottom: none;
}

/* Badges */
.badge {
    padding: 0.4em 0.75em;
    border-radius: 6px;
    font-weight: 500;
    font-size: 0.8rem;
}

/* Autocomplete */
.autocomplete-items {
    position: absolute;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    z-index: 99;
    top: 100%;
    left: 0;
    right: 0;
    max-height: 250px;
    overflow-y: auto;
    background-color: var(--bg-white);
    box-shadow: var(--shadow-lg);
    margin-top: 4px;
}

.autocomplete-items div {
    padding: 0.75rem 1rem;
    cursor: pointer;
    background-color: var(--bg-white);
    border-bottom: 1px solid var(--border-color);
    transition: background-color 0.2s ease;
}

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

.autocomplete-items div:hover {
    background-color: #f8f9fa;
}

.autocomplete-active {
    background-color: var(--primary-color) !important;
    color: #ffffff;
}

/* Invoice Items */
.invoice-item-row {
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
}

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

/* Mobile Responsive */
@media (max-width: 991.98px) {
    .sidebar {
        transform: translateX(-100%);
    }
    
    .sidebar.active {
        transform: translateX(0);
    }
    
    .main-wrapper {
        margin-left: 0;
    }
    
    .sidebar-toggle-mobile {
        display: block;
    }
    
    .topbar {
        padding: 0 1rem;
    }
    
    .main-content {
        padding: 1rem;
    }
    
    body.sidebar-open {
        overflow: hidden;
    }
    
    body.sidebar-open::before {
        content: '';
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(0, 0, 0, 0.5);
        z-index: 999;
    }
}

@media (max-width: 768px) {
    .page-title {
        font-size: 1.25rem;
    }
    
    .card-body {
        padding: 1rem;
    }
    
    .table {
        font-size: 0.85rem;
    }
    
    .table thead th,
    .table tbody td {
        padding: 0.75rem 0.5rem;
    }
}

/* Print Styles */
@media print {
    .sidebar,
    .topbar,
    .btn,
    .no-print {
        display: none !important;
    }
    
    .main-wrapper {
        margin-left: 0 !important;
    }
    
    .main-content {
        padding: 0 !important;
    }
}

/* Utility Classes */
.cursor-pointer {
    cursor: pointer;
}

.text-truncate-2 {
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* Loading Spinner */
.spinner-border-sm {
    width: 1rem;
    height: 1rem;
    border-width: 0.15em;
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: #888;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #555;
}

.sidebar-nav::-webkit-scrollbar {
    width: 6px;
}

.sidebar-nav::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.05);
}

.sidebar-nav::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.2);
    border-radius: 3px;
}

.sidebar-nav::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.3);
}