/* ===== CSS VARIABLES ===== */
:root {
    /* Colors */
    --iyeg-primary: #2a5685;
    --iyeg-primary-dark: #1e3a5f;
    --iyeg-accent: #007acc;
    --iyeg-accent-light: #e6f2fa;
    --iyeg-success: #28a745;
    --iyeg-warning: #ffc107;
    --iyeg-danger: #dc3545;
    --iyeg-light: #f8f9fa;
    --iyeg-dark: #343a40;
    --iyeg-border: #ced4da;
    --iyeg-text: #495057;
    --iyeg-bg: #f5f5f5;

    /* Layout */
    --iyeg-sidebar-width: 220px;
    --iyeg-sidebar-collapsed-width: 60px;
    --iyeg-header-height: 3.5rem; /* 49px */
    --iyeg-field-height: 1.643rem; /* 23px */
    --iyeg-footer-height: 2.857rem; /* 40px */
    --iyeg-transition-speed: 0.3s;

    /* Typography */
    --iyeg-font-size-xs: 0.786rem;  /* 11px */
    --iyeg-font-size-sm: 0.857rem;  /* 12px */
    --iyeg-font-size-base: 0.929rem; /* 13px */
    --iyeg-font-size-lg: 1rem;      /* 14px */
    --iyeg-font-size-xl: 1.143rem;  /* 16px */
    --iyeg-font-size-2xl: 1.714rem; /* 24px */

    /* Light theme sidebar colors */
    --iyeg-sidebar-bg: #2a5685;
    --iyeg-sidebar-submenu-bg: #1e3a5f;
    --iyeg-sidebar-text: #e3eaf3;
    --iyeg-sidebar-hover: rgba(255, 255, 255, 0.1);
    --iyeg-sidebar-active: rgba(255, 255, 255, 0.15);
}

/* ===== RESET & BASE STYLES ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-size: var(--iyeg-font-size-base);
    line-height: 1.5;
    color: var(--iyeg-text);
    background-color: var(--iyeg-bg);
}

a {
    color: var(--iyeg-accent);
    text-decoration: none;
    transition: color var(--iyeg-transition-speed);
}

a:hover {
    color: var(--iyeg-primary);
}

img {
    max-width: 100%;
    height: auto;
}

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

/* Sidebar */
.sidebar {
    width: var(--iyeg-sidebar-width);
    background: var(--iyeg-sidebar-bg);
    color: var(--iyeg-sidebar-text);
    position: fixed;
    height: 100vh;
    overflow-y: auto;
    transition: width var(--iyeg-transition-speed);
    z-index: 1000;
}

.sidebar.collapsed {
    width: var(--iyeg-sidebar-collapsed-width);
}

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

.sidebar-header h1 {
    font-size: var(--iyeg-font-size-lg);
    font-weight: 600;
    white-space: nowrap;
    overflow: hidden;
}

.sidebar.collapsed .sidebar-header h1 {
    display: none;
}

.sidebar-toggle {
    background: none;
    border: none;
    color: inherit;
    cursor: pointer;
    font-size: var(--iyeg-font-size-lg);
    padding: 0.25rem;
    border-radius: 4px;
    transition: background var(--iyeg-transition-speed);
}

.sidebar-toggle:hover {
    background: var(--iyeg-sidebar-hover);
}

.sidebar-menu {
    list-style: none;
    padding: 0.5rem 0;
}

.sidebar-menu li {
    position: relative;
}

.sidebar-menu a {
    display: flex;
    align-items: center;
    padding: 0.75rem 1rem;
    color: var(--iyeg-sidebar-text);
    text-decoration: none;
    transition: background var(--iyeg-transition-speed);
}

.sidebar-menu a:hover,
.sidebar-menu a.active {
    background: var(--iyeg-sidebar-hover);
}

.sidebar-menu i {
    width: 1.5rem;
    text-align: center;
    margin-right: 0.75rem;
    font-size: var(--iyeg-font-size-lg);
}

.sidebar.collapsed .sidebar-menu span {
    display: none;
}

.sidebar.collapsed .sidebar-menu i {
    margin-right: 0;
}

.sidebar-menu .badge {
    margin-left: auto;
    background: rgba(255, 255, 255, 0.2);
    padding: 0.125rem 0.5rem;
    border-radius: 10px;
    font-size: var(--iyeg-font-size-xs);
}

.sidebar.collapsed .sidebar-menu .badge {
    display: none;
}

/* Main content */
.main-content {
    flex: 1;
    margin-left: var(--iyeg-sidebar-width);
    transition: margin-left var(--iyeg-transition-speed);
}

.sidebar.collapsed ~ .main-content {
    margin-left: var(--iyeg-sidebar-collapsed-width);
}

/* Header */
.header {
    background: white;
    border-bottom: 1px solid var(--iyeg-border);
    height: var(--iyeg-header-height);
    padding: 0 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-left h2 {
    font-size: var(--iyeg-font-size-xl);
    font-weight: 600;
    color: var(--iyeg-primary);
}

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

.user-menu {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 4px;
    transition: background var(--iyeg-transition-speed);
}

.user-menu:hover {
    background: var(--iyeg-light);
}

.user-avatar {
    width: 2rem;
    height: 2rem;
    border-radius: 50%;
    background: var(--iyeg-primary);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
}

.user-name {
    font-weight: 500;
}

.sidebar.collapsed ~ .main-content .user-name {
    display: none;
}

/* Content area */
.content {
    padding: 1.5rem;
    min-height: calc(100vh - var(--iyeg-header-height) - var(--iyeg-footer-height));
}

/* Footer */
.footer {
    background: white;
    border-top: 1px solid var(--iyeg-border);
    height: var(--iyeg-footer-height);
    padding: 0 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    color: var(--iyeg-text);
    font-size: var(--iyeg-font-size-sm);
}

/* ===== COMPONENTS ===== */
/* Cards */
.card {
    background: white;
    border: 1px solid var(--iyeg-border);
    border-radius: 6px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    margin-bottom: 1.5rem;
}

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

.card-title {
    font-size: var(--iyeg-font-size-lg);
    font-weight: 600;
    color: var(--iyeg-primary);
    margin: 0;
}

.card-body {
    padding: 1.5rem;
}

.card-footer {
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--iyeg-border);
    background: var(--iyeg-light);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border: 1px solid transparent;
    border-radius: 4px;
    font-size: var(--iyeg-font-size-base);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--iyeg-transition-speed);
    text-decoration: none;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-sm {
    padding: 0.25rem 0.5rem;
    font-size: var(--iyeg-font-size-sm);
}

.btn-lg {
    padding: 0.75rem 1.5rem;
    font-size: var(--iyeg-font-size-lg);
}

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

.btn-primary:hover:not(:disabled) {
    background: var(--iyeg-primary-dark);
    border-color: var(--iyeg-primary-dark);
}

.btn-secondary {
    background: var(--iyeg-light);
    color: var(--iyeg-text);
    border-color: var(--iyeg-border);
}

.btn-secondary:hover:not(:disabled) {
    background: #e9ecef;
}

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

.btn-success:hover:not(:disabled) {
    background: #218838;
    border-color: #1e7e34;
}

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

.btn-danger:hover:not(:disabled) {
    background: #c82333;
    border-color: #bd2130;
}

.btn-warning {
    background: var(--iyeg-warning);
    color: var(--iyeg-dark);
    border-color: var(--iyeg-warning);
}

.btn-warning:hover:not(:disabled) {
    background: #e0a800;
    border-color: #d39e00;
}

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

.btn-outline:hover:not(:disabled) {
    background: var(--iyeg-primary);
    color: white;
}

.btn-group {
    display: flex;
    gap: 0.5rem;
}

.btn-icon {
    padding: 0.5rem;
    width: 2.5rem;
    height: 2.5rem;
    justify-content: center;
}

/* Forms */
.form-group {
    margin-bottom: 1rem;
}

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

.form-control {
    width: 100%;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--iyeg-border);
    border-radius: 4px;
    font-size: var(--iyeg-font-size-base);
    transition: border-color var(--iyeg-transition-speed);
    background: white;
}

.form-control:focus {
    border-color: var(--iyeg-accent);
    outline: none;
    box-shadow: 0 0 0 2px rgba(0, 122, 204, 0.1);
}

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

.form-text {
    display: block;
    margin-top: 0.25rem;
    font-size: var(--iyeg-font-size-sm);
    color: var(--iyeg-text);
}

.invalid-feedback {
    display: block;
    margin-top: 0.25rem;
    font-size: var(--iyeg-font-size-sm);
    color: var(--iyeg-danger);
}

/* Tables */
.table {
    width: 100%;
    background: white;
    border-collapse: collapse;
}

.table th,
.table td {
    padding: 0.75rem;
    border-bottom: 1px solid var(--iyeg-border);
    text-align: left;
}

.table th {
    background: var(--iyeg-light);
    font-weight: 600;
    color: var(--iyeg-text);
    white-space: nowrap;
}

.table tbody tr:hover {
    background: var(--iyeg-accent-light);
}

.table-responsive {
    overflow-x: auto;
}

/* Alerts */
.alert {
    padding: 1rem;
    border-radius: 4px;
    margin-bottom: 1rem;
    border: 1px solid transparent;
}

.alert-success {
    background: #d4edda;
    color: #155724;
    border-color: #c3e6cb;
}

.alert-error {
    background: #f8d7da;
    color: #721c24;
    border-color: #f5c6cb;
}

.alert-warning {
    background: #fff3cd;
    color: #856404;
    border-color: #ffeeba;
}

.alert-info {
    background: #d1ecf1;
    color: #0c5460;
    border-color: #bee5eb;
}

/* Badges */
.badge {
    display: inline-block;
    padding: 0.25rem 0.5rem;
    font-size: var(--iyeg-font-size-xs);
    font-weight: 600;
    line-height: 1;
    text-align: center;
    white-space: nowrap;
    vertical-align: baseline;
    border-radius: 10px;
}

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

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

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

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

.badge-info {
    background: var(--iyeg-accent);
    color: white;
}

/* Pagination */
.pagination {
    display: flex;
    gap: 0.5rem;
    list-style: none;
    padding: 0;
    margin: 1rem 0;
}

.page-item {
    margin: 0;
}

.page-link {
    display: block;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--iyeg-border);
    border-radius: 4px;
    color: var(--iyeg-text);
    text-decoration: none;
    transition: all var(--iyeg-transition-speed);
}

.page-link:hover {
    background: var(--iyeg-light);
}

.page-item.active .page-link {
    background: var(--iyeg-primary);
    color: white;
    border-color: var(--iyeg-primary);
}

.page-item.disabled .page-link {
    color: #6c757d;
    pointer-events: none;
    background: var(--iyeg-light);
}

/* Search & Filters */
.search-box {
    position: relative;
    max-width: 300px;
}

.search-box input {
    width: 100%;
    padding: 0.5rem 0.75rem 0.5rem 2.5rem;
}

.search-box i {
    position: absolute;
    left: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    color: #6c757d;
}

.filter-bar {
    background: var(--iyeg-light);
    padding: 1rem;
    border-radius: 4px;
    margin-bottom: 1rem;
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    align-items: flex-end;
}

.filter-group {
    flex: 1;
    min-width: 200px;
}

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

.stat-card {
    background: white;
    border: 1px solid var(--iyeg-border);
    border-radius: 6px;
    padding: 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    transition: transform var(--iyeg-transition-speed), box-shadow var(--iyeg-transition-speed);
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.stat-icon {
    width: 3rem;
    height: 3rem;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--iyeg-font-size-2xl);
    color: white;
}

.stat-icon.invoice {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.stat-icon.quotation {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
}

.stat-icon.payment {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
}

.stat-icon.password {
    background: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
}

.stat-content {
    flex: 1;
}

.stat-value {
    font-size: var(--iyeg-font-size-2xl);
    font-weight: 600;
    color: var(--iyeg-primary);
    line-height: 1;
    margin-bottom: 0.25rem;
}

.stat-label {
    font-size: var(--iyeg-font-size-sm);
    color: var(--iyeg-text);
    font-weight: 500;
}

.stat-change {
    font-size: var(--iyeg-font-size-xs);
    color: var(--iyeg-success);
}

.stat-change.negative {
    color: var(--iyeg-danger);
}

/* Action buttons */
.quick-actions {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.action-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 2rem 1rem;
    background: white;
    border: 2px solid var(--iyeg-border);
    border-radius: 6px;
    text-decoration: none;
    color: var(--iyeg-text);
    transition: all var(--iyeg-transition-speed);
}

.action-btn:hover {
    border-color: var(--iyeg-primary);
    color: var(--iyeg-primary);
    transform: translateY(-2px);
}

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

.action-btn span {
    font-weight: 500;
    text-align: center;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1100;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}

.modal.show {
    display: flex;
}

.modal-dialog {
    background: white;
    border-radius: 6px;
    max-width: 500px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
}

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

.modal-title {
    font-size: var(--iyeg-font-size-lg);
    font-weight: 600;
    margin: 0;
}

.modal-close {
    background: none;
    border: none;
    font-size: var(--iyeg-font-size-xl);
    color: var(--iyeg-text);
    cursor: pointer;
    padding: 0.25rem;
    border-radius: 4px;
    transition: background var(--iyeg-transition-speed);
}

.modal-close:hover {
    background: var(--iyeg-light);
}

.modal-body {
    padding: 1.5rem;
}

.modal-footer {
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--iyeg-border);
    display: flex;
    justify-content: flex-end;
    gap: 0.5rem;
}

/* Status indicators */
.status-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-size: var(--iyeg-font-size-sm);
    font-weight: 500;
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
}

.status-pending {
    background: #fff3cd;
    color: #856404;
}

.status-pending .status-dot {
    background: #ffc107;
}

.status-paid {
    background: #d4edda;
    color: #155724;
}

.status-paid .status-dot {
    background: #28a745;
}

.status-partial {
    background: #d1ecf1;
    color: #0c5460;
}

.status-partial .status-dot {
    background: #17a2b8;
}

/* ===== UTILITIES ===== */
.d-flex {
    display: flex;
}

.align-items-center {
    align-items: center;
}

.justify-content-between {
    justify-content: space-between;
}

.gap-1 {
    gap: 0.5rem;
}

.gap-2 {
    gap: 1rem;
}

.mb-0 {
    margin-bottom: 0;
}

.mb-1 {
    margin-bottom: 0.5rem;
}

.mb-2 {
    margin-bottom: 1rem;
}

.mb-3 {
    margin-bottom: 1.5rem;
}

.mt-1 {
    margin-top: 0.5rem;
}

.mt-2 {
    margin-top: 1rem;
}

.mt-3 {
    margin-top: 1.5rem;
}

.text-center {
    text-align: center;
}

.text-right {
    text-align: right;
}

.text-success {
    color: var(--iyeg-success);
}

.text-danger {
    color: var(--iyeg-danger);
}

.text-warning {
    color: var(--iyeg-warning);
}

.text-muted {
    color: #6c757d;
}

.font-weight-bold {
    font-weight: 600;
}

.w-100 {
    width: 100%;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
        width: var(--iyeg-sidebar-width);
    }
    
    .sidebar.show {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .sidebar-toggle {
        display: block;
    }
    
    .header-left h2 {
        font-size: var(--iyeg-font-size-lg);
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .quick-actions {
        grid-template-columns: 1fr;
    }
    
    .filter-bar {
        flex-direction: column;
    }
    
    .filter-group {
        min-width: 100%;
    }
}

/* Print styles */
@media print {
    .sidebar,
    .header,
    .footer,
    .btn-print,
    .btn-download,
    .action-buttons {
        display: none !important;
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .content {
        padding: 0;
    }
    
    .card {
        border: none;
        box-shadow: none;
    }
}