:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #dbeafe;
    --secondary: #64748b;
    --success: #22c55e;
    --success-light: #dcfce7;
    --danger: #ef4444;
    --danger-light: #fee2e2;
    --warning: #f59e0b;
    --warning-light: #fef3c7;
    --info: #0ea5e9;
    --info-light: #e0f2fe;
    --dark: #1e293b;
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;
    --white: #ffffff;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px 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);
    --radius-sm: 6px;
    --radius: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --sidebar-width: 260px;
    --header-height: 64px;
    --transition: all 0.2s ease;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--gray-50);
    color: var(--gray-800);
    line-height: 1.6;
    font-size: 14px;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
}

/* Login Page */
.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    padding: 20px;
}

.login-container {
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 420px;
    padding: 40px;
}

.login-logo {
    text-align: center;
    margin-bottom: 32px;
}

.login-logo h1 {
    font-size: 24px;
    font-weight: 700;
    color: var(--gray-900);
}

.login-logo p {
    color: var(--gray-500);
    font-size: 14px;
    margin-top: 4px;
}

.login-logo .logo-icon {
    width: 56px;
    height: 56px;
    background: var(--primary);
    border-radius: var(--radius-md);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
}

.login-logo .logo-icon svg {
    width: 32px;
    height: 32px;
    fill: white;
}

/* App Layout */
.app-layout {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background: var(--gray-900);
    color: var(--white);
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    overflow-y: auto;
    z-index: 100;
    transition: var(--transition);
}

.sidebar-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--gray-700);
    display: flex;
    align-items: center;
    gap: 12px;
}

.sidebar-header .logo-icon {
    width: 40px;
    height: 40px;
    background: var(--primary);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.sidebar-header .logo-icon svg {
    width: 24px;
    height: 24px;
    fill: white;
}

.sidebar-header h2 {
    font-size: 16px;
    font-weight: 600;
    white-space: nowrap;
}

.sidebar-nav {
    padding: 16px 0;
}

.sidebar-section {
    margin-bottom: 8px;
}

.sidebar-section-title {
    padding: 8px 24px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--gray-400);
}

.sidebar-nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 24px;
    color: var(--gray-300);
    font-size: 14px;
    font-weight: 500;
    transition: var(--transition);
    cursor: pointer;
    border: none;
    background: none;
    width: 100%;
    text-align: left;
}

.sidebar-nav-item:hover {
    background: var(--gray-800);
    color: var(--white);
}

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

.sidebar-nav-item svg {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

/* Main Content */
.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    min-height: 100vh;
}

/* Header */
.header {
    height: var(--header-height);
    background: var(--white);
    border-bottom: 1px solid var(--gray-200);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 32px;
    position: sticky;
    top: 0;
    z-index: 50;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 16px;
}

.header-left h1 {
    font-size: 20px;
    font-weight: 600;
    color: var(--gray-900);
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.menu-toggle svg {
    width: 24px;
    height: 24px;
    color: var(--gray-600);
}

.header-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

.header-search {
    position: relative;
}

.header-search input {
    width: 280px;
    padding: 8px 16px 8px 40px;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius);
    font-size: 14px;
    background: var(--gray-50);
    transition: var(--transition);
}

.header-search input:focus {
    outline: none;
    border-color: var(--primary);
    background: var(--white);
    box-shadow: 0 0 0 3px var(--primary-light);
}

.header-search svg {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    width: 18px;
    height: 18px;
    color: var(--gray-400);
}

.header-btn {
    position: relative;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    border-radius: var(--radius);
    transition: var(--transition);
}

.header-btn:hover {
    background: var(--gray-100);
}

.header-btn svg {
    width: 22px;
    height: 22px;
    color: var(--gray-600);
}

.header-btn .badge {
    position: absolute;
    top: 4px;
    right: 4px;
    width: 18px;
    height: 18px;
    background: var(--danger);
    color: white;
    font-size: 10px;
    font-weight: 600;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.user-profile {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    padding: 6px 12px;
    border-radius: var(--radius);
    transition: var(--transition);
}

.user-profile:hover {
    background: var(--gray-100);
}

.user-avatar {
    width: 36px;
    height: 36px;
    background: var(--primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 14px;
}

.user-info {
    display: flex;
    flex-direction: column;
}

.user-info .name {
    font-weight: 600;
    font-size: 14px;
    color: var(--gray-800);
}

.user-info .role {
    font-size: 12px;
    color: var(--gray-500);
}

/* Page Content */
.page-content {
    padding: 32px;
}

/* Cards */
.card {
    background: var(--white);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow);
    border: 1px solid var(--gray-200);
}

.card-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--gray-200);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.card-header h2 {
    font-size: 16px;
    font-weight: 600;
    color: var(--gray-900);
}

.card-body {
    padding: 24px;
}

/* KPI Cards */
.kpi-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
    margin-bottom: 24px;
}

.kpi-card {
    background: var(--white);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow);
    border: 1px solid var(--gray-200);
    padding: 24px;
    display: flex;
    align-items: flex-start;
    gap: 16px;
    transition: var(--transition);
}

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

.kpi-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.kpi-icon svg {
    width: 24px;
    height: 24px;
}

.kpi-icon.blue { background: var(--primary-light); color: var(--primary); }
.kpi-icon.green { background: var(--success-light); color: var(--success); }
.kpi-icon.red { background: var(--danger-light); color: var(--danger); }
.kpi-icon.yellow { background: var(--warning-light); color: var(--warning); }
.kpi-icon.purple { background: #f3e8ff; color: #9333ea; }

.kpi-content h3 {
    font-size: 28px;
    font-weight: 700;
    color: var(--gray-900);
    line-height: 1.2;
}

.kpi-content p {
    font-size: 13px;
    color: var(--gray-500);
    margin-top: 4px;
}

.kpi-trend {
    font-size: 12px;
    font-weight: 600;
    margin-top: 8px;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 2px 8px;
    border-radius: 20px;
}

.kpi-trend.up { background: var(--success-light); color: var(--success); }
.kpi-trend.down { background: var(--danger-light); color: var(--danger); }

/* Tables */
.table-container {
    overflow-x: auto;
    margin: -1px;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
}

.data-table th {
    background: var(--gray-50);
    padding: 12px 16px;
    text-align: left;
    font-weight: 600;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--gray-500);
    border-bottom: 1px solid var(--gray-200);
    white-space: nowrap;
}

.data-table td {
    padding: 14px 16px;
    border-bottom: 1px solid var(--gray-100);
    font-size: 14px;
    color: var(--gray-700);
}

.data-table tr:hover td {
    background: var(--gray-50);
}

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

/* Badges */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    white-space: nowrap;
}

.badge.active, .badge.approved, .badge.paid, .badge.completed, .badge.won { background: var(--success-light); color: var(--success); }
.badge.inactive, .badge.rejected, .badge.cancelled, .badge.lost { background: var(--danger-light); color: var(--danger); }
.badge.pending, .badge.draft, .badge.sent, .badge.new { background: var(--warning-light); color: var(--warning); }
.badge.in_progress, .badge.active-status, .badge.active-project { background: var(--primary-light); color: var(--primary); }
.badge.on_hold, .badge.expired { background: var(--gray-100); color: var(--gray-600); }
.badge.overdue { background: var(--danger-light); color: var(--danger); }
.badge.partially_paid { background: var(--info-light); color: var(--info); }
.badge.open, .badge.assigned { background: var(--warning-light); color: var(--warning); }
.badge.resolved, .badge.closed { background: var(--success-light); color: var(--success); }
.badge.critical { background: var(--danger); color: white; }
.badge.high { background: var(--warning); color: white; }
.badge.medium { background: var(--info); color: white; }
.badge.low { background: var(--gray-400); color: white; }

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: var(--radius);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    white-space: nowrap;
}

.btn svg {
    width: 18px;
    height: 18px;
}

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

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

.btn-secondary {
    background: var(--gray-100);
    color: var(--gray-700);
    border: 1px solid var(--gray-300);
}

.btn-secondary:hover {
    background: var(--gray-200);
}

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

.btn-success:hover {
    background: #16a34a;
}

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

.btn-danger:hover {
    background: #dc2626;
}

.btn-sm {
    padding: 6px 12px;
    font-size: 13px;
}

.btn-sm svg {
    width: 16px;
    height: 16px;
}

.btn-icon {
    padding: 8px;
}

/* Forms */
.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: 6px;
}

.form-control {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius);
    font-size: 14px;
    color: var(--gray-800);
    transition: var(--transition);
    background: var(--white);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-light);
}

.form-control::placeholder {
    color: var(--gray-400);
}

select.form-control {
    appearance: none;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3e%3cpath fill='none' stroke='%23343a40' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='m2 5 6 6 6-6'/%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 12px center;
    background-size: 16px 12px;
    padding-right: 36px;
}

textarea.form-control {
    resize: vertical;
    min-height: 80px;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}

.form-actions {
    display: flex;
    gap: 12px;
    justify-content: flex-end;
    margin-top: 24px;
    padding-top: 20px;
    border-top: 1px solid var(--gray-200);
}

/* Modal */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 200;
    padding: 20px;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
    transform: translateY(20px);
    transition: var(--transition);
}

.modal-overlay.active .modal {
    transform: translateY(0);
}

.modal-header {
    padding: 24px;
    border-bottom: 1px solid var(--gray-200);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.modal-header h2 {
    font-size: 18px;
    font-weight: 600;
    color: var(--gray-900);
}

.modal-close {
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
    border-radius: var(--radius);
    transition: var(--transition);
}

.modal-close:hover {
    background: var(--gray-100);
}

.modal-body {
    padding: 24px;
}

.modal-footer {
    padding: 16px 24px;
    border-top: 1px solid var(--gray-200);
    display: flex;
    gap: 12px;
    justify-content: flex-end;
}

/* Toast */
.toast-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 300;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.toast {
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    padding: 14px 20px;
    display: flex;
    align-items: center;
    gap: 12px;
    min-width: 300px;
    max-width: 400px;
    animation: slideIn 0.3s ease;
    border-left: 4px solid;
}

.toast.success { border-color: var(--success); }
.toast.error { border-color: var(--danger); }
.toast.warning { border-color: var(--warning); }
.toast.info { border-color: var(--info); }

@keyframes slideIn {
    from { transform: translateX(100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

.toast-close {
    margin-left: auto;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--gray-400);
}

/* Pagination */
.pagination {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 24px;
    border-top: 1px solid var(--gray-200);
}

.pagination-info {
    font-size: 13px;
    color: var(--gray-500);
}

.pagination-btns {
    display: flex;
    gap: 4px;
}

.pagination-btn {
    padding: 6px 12px;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius);
    background: var(--white);
    cursor: pointer;
    font-size: 13px;
    transition: var(--transition);
}

.pagination-btn:hover {
    background: var(--gray-50);
}

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

.pagination-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Tabs */
.tabs {
    display: flex;
    border-bottom: 2px solid var(--gray-200);
    margin-bottom: 24px;
    gap: 0;
}

.tab-btn {
    padding: 12px 20px;
    border: none;
    background: none;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    color: var(--gray-500);
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
    transition: var(--transition);
}

.tab-btn:hover {
    color: var(--gray-700);
}

.tab-btn.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
}

/* Filter Bar */
.filter-bar {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin-bottom: 20px;
    align-items: center;
}

.filter-bar .form-control {
    width: auto;
    min-width: 160px;
}

/* Grid Layouts */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }

/* Progress Bar */
.progress-bar {
    height: 8px;
    background: var(--gray-200);
    border-radius: 4px;
    overflow: hidden;
}

.progress-bar-fill {
    height: 100%;
    border-radius: 4px;
    transition: width 0.3s ease;
}

.progress-bar-fill.blue { background: var(--primary); }
.progress-bar-fill.green { background: var(--success); }
.progress-bar-fill.yellow { background: var(--warning); }
.progress-bar-fill.red { background: var(--danger); }

/* Empty State */
.empty-state {
    text-align: center;
    padding: 60px 20px;
}

.empty-state svg {
    width: 64px;
    height: 64px;
    color: var(--gray-300);
    margin-bottom: 16px;
}

.empty-state h3 {
    font-size: 16px;
    color: var(--gray-600);
    margin-bottom: 8px;
}

.empty-state p {
    font-size: 14px;
    color: var(--gray-400);
    margin-bottom: 20px;
}

/* Loading Spinner */
.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--gray-200);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 40px auto;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Dropdown */
.dropdown {
    position: relative;
}

.dropdown-menu {
    position: absolute;
    right: 0;
    top: 100%;
    margin-top: 8px;
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    min-width: 180px;
    z-index: 50;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: var(--transition);
}

.dropdown-menu.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 16px;
    font-size: 14px;
    color: var(--gray-700);
    cursor: pointer;
    transition: var(--transition);
}

.dropdown-item:hover {
    background: var(--gray-50);
    color: var(--gray-900);
}

.dropdown-item svg {
    width: 18px;
    height: 18px;
    color: var(--gray-400);
}

.dropdown-divider {
    height: 1px;
    background: var(--gray-200);
    margin: 4px 0;
}

/* Chart Container */
.chart-container {
    padding: 20px;
    min-height: 300px;
}

/* Responsive */
@media (max-width: 1024px) {
    .sidebar {
        transform: translateX(-100%);
    }
    
    .sidebar.open {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .menu-toggle {
        display: block;
    }
    
    .header-search input {
        width: 200px;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .grid-2, .grid-3 {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .page-content {
        padding: 16px;
    }
    
    .kpi-grid {
        grid-template-columns: 1fr;
    }
    
    .header {
        padding: 0 16px;
    }
    
    .header-search {
        display: none;
    }
    
    .user-info {
        display: none;
    }
    
    .filter-bar {
        flex-direction: column;
    }
    
    .filter-bar .form-control {
        width: 100%;
    }
    
    .pagination {
        flex-direction: column;
        gap: 12px;
    }
}

@media (max-width: 480px) {
    .kpi-card {
        padding: 16px;
    }
    
    .kpi-content h3 {
        font-size: 22px;
    }
    
    .card-header {
        flex-direction: column;
        gap: 12px;
        align-items: flex-start;
    }
    
    .modal {
        margin: 10px;
        max-height: 95vh;
    }
}