/* Color Palette */
:root {
    --primary-slate: #475569;
    --dark-slate: #334155;
    --light-slate: #64748b;
    --soft-blue: #60a5fa;
    --dark-blue: #3b82f6;
    --light-blue: #93c5fd;
    --white: #ffffff;
    --off-white: #f8fafc;
    --border-color: #e2e8f0;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --info: #8b5cf6;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --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);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

/* Reset & Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: linear-gradient(135deg, var(--off-white) 0%, #e0e7ff 100%);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

/* Container */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Header */
.header {
    background: linear-gradient(135deg, var(--dark-slate) 0%, var(--primary-slate) 100%);
    box-shadow: var(--shadow-lg);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--white);
    font-size: 24px;
    font-weight: 700;
}

.logo i {
    color: var(--soft-blue);
    font-size: 28px;
}

.nav {
    display: flex;
    gap: 8px;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    border-radius: 8px;
    transition: all 0.3s ease;
    font-weight: 500;
}

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

.nav-link.active {
    background: var(--soft-blue);
    color: var(--white);
}

/* Main Content */
.main {
    min-height: calc(100vh - 80px);
    padding: 40px 0;
}

.page {
    display: none;
}

.page.active {
    display: block;
}

/* Page Header */
.page-header {
    margin-bottom: 40px;
    text-align: center;
}

.page-header h1 {
    font-size: 36px;
    color: var(--dark-slate);
    margin-bottom: 8px;
    font-weight: 700;
}

.subtitle {
    font-size: 18px;
    color: var(--text-secondary);
    font-weight: 400;
}

/* KPI Cards */
.kpi-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
    margin-bottom: 40px;
}

.kpi-card {
    background: var(--white);
    border-radius: 12px;
    padding: 24px;
    box-shadow: var(--shadow-md);
    display: flex;
    gap: 20px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.kpi-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.kpi-icon {
    width: 60px;
    height: 60px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    color: var(--white);
}

.kpi-icon.blue {
    background: linear-gradient(135deg, var(--soft-blue) 0%, var(--dark-blue) 100%);
}

.kpi-icon.green {
    background: linear-gradient(135deg, #34d399 0%, var(--success) 100%);
}

.kpi-icon.orange {
    background: linear-gradient(135deg, #fbbf24 0%, var(--warning) 100%);
}

.kpi-icon.purple {
    background: linear-gradient(135deg, #a78bfa 0%, var(--info) 100%);
}

.kpi-content {
    flex: 1;
}

.kpi-label {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 4px;
    font-weight: 500;
}

.kpi-value {
    font-size: 32px;
    font-weight: 700;
    color: var(--dark-slate);
    margin-bottom: 8px;
}

.kpi-change {
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 4px;
    font-weight: 500;
}

.kpi-change.positive {
    color: var(--success);
}

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

.kpi-change.neutral {
    color: var(--text-secondary);
}

/* Chart Grid */
.chart-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
    gap: 24px;
    margin-bottom: 40px;
}

.chart-card {
    background: var(--white);
    border-radius: 12px;
    padding: 24px;
    box-shadow: var(--shadow-md);
}

.chart-card.full-width {
    grid-column: 1 / -1;
}

.chart-card h3 {
    font-size: 18px;
    color: var(--dark-slate);
    margin-bottom: 20px;
    font-weight: 600;
}

.chart-container {
    position: relative;
}

/* Stat Cards */
.stat-card {
    background: linear-gradient(135deg, var(--white) 0%, var(--off-white) 100%);
    border-radius: 12px;
    padding: 24px;
    box-shadow: var(--shadow-md);
    border-left: 4px solid var(--soft-blue);
}

.stat-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.stat-header i {
    font-size: 24px;
    color: var(--soft-blue);
}

.stat-header h4 {
    font-size: 16px;
    color: var(--text-secondary);
    font-weight: 500;
}

.stat-value {
    font-size: 36px;
    font-weight: 700;
    color: var(--dark-slate);
}

/* Table Card */
.table-card {
    background: var(--white);
    border-radius: 12px;
    padding: 24px;
    box-shadow: var(--shadow-md);
    margin-bottom: 40px;
}

.table-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    flex-wrap: wrap;
    gap: 16px;
}

.table-header h3 {
    font-size: 20px;
    color: var(--dark-slate);
    font-weight: 600;
}

.table-actions {
    display: flex;
    gap: 12px;
    align-items: center;
}

.search-input {
    padding: 10px 16px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
    transition: all 0.3s ease;
    min-width: 250px;
}

.search-input:focus {
    outline: none;
    border-color: var(--soft-blue);
    box-shadow: 0 0 0 3px rgba(96, 165, 250, 0.1);
}

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

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

.data-table th {
    background: linear-gradient(135deg, var(--primary-slate) 0%, var(--dark-slate) 100%);
    color: var(--white);
    padding: 14px 16px;
    text-align: left;
    font-weight: 600;
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.data-table th:first-child {
    border-radius: 8px 0 0 0;
}

.data-table th:last-child {
    border-radius: 0 8px 0 0;
}

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

.data-table tbody tr {
    transition: background 0.2s ease;
}

.data-table tbody tr:hover {
    background: var(--off-white);
}

/* Status Badges */
.status-badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.status-pending {
    background: #fef3c7;
    color: #92400e;
}

.status-processing {
    background: #dbeafe;
    color: #1e40af;
}

.status-shipped {
    background: #e0e7ff;
    color: #3730a3;
}

.status-delivered {
    background: #d1fae5;
    color: #065f46;
}

.status-cancelled {
    background: #fee2e2;
    color: #991b1b;
}

.priority-low {
    background: #f3f4f6;
    color: #6b7280;
}

.priority-medium {
    background: #dbeafe;
    color: #1e40af;
}

.priority-high {
    background: #fed7aa;
    color: #9a3412;
}

.priority-urgent {
    background: #fecaca;
    color: #991b1b;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--soft-blue) 0%, var(--dark-blue) 100%);
    color: var(--white);
    box-shadow: var(--shadow-md);
}

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

.btn-secondary {
    background: var(--white);
    color: var(--primary-slate);
    border: 2px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--off-white);
    border-color: var(--primary-slate);
}

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

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

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

.btn-success:hover {
    background: #059669;
}

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

/* Form Card */
.form-card {
    background: var(--white);
    border-radius: 12px;
    padding: 32px;
    box-shadow: var(--shadow-md);
    margin-bottom: 40px;
}

.form-section {
    margin-bottom: 32px;
    padding-bottom: 32px;
    border-bottom: 2px solid var(--border-color);
}

.form-section:last-of-type {
    border-bottom: none;
}

.form-section h3 {
    font-size: 20px;
    color: var(--dark-slate);
    margin-bottom: 20px;
    font-weight: 600;
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group.full-width {
    grid-column: 1 / -1;
}

.form-group label {
    font-size: 14px;
    font-weight: 600;
    color: var(--dark-slate);
    margin-bottom: 8px;
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: 12px 16px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
    font-family: inherit;
    transition: all 0.3s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--soft-blue);
    box-shadow: 0 0 0 3px rgba(96, 165, 250, 0.1);
}

.form-group textarea {
    resize: vertical;
}

.form-group input[readonly] {
    background: var(--off-white);
    cursor: not-allowed;
}

.form-actions {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    margin-top: 24px;
}

/* Filter Card */
.filter-card {
    background: var(--white);
    border-radius: 12px;
    padding: 24px;
    box-shadow: var(--shadow-md);
    margin-bottom: 32px;
}

.filter-card h3 {
    font-size: 18px;
    color: var(--dark-slate);
    margin-bottom: 20px;
    font-weight: 600;
}

/* Report Tabs */
.report-tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 32px;
    flex-wrap: wrap;
}

.report-tab {
    padding: 12px 24px;
    background: var(--white);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    color: var(--primary-slate);
    cursor: pointer;
    transition: all 0.3s ease;
}

.report-tab:hover {
    background: var(--off-white);
    border-color: var(--soft-blue);
}

.report-tab.active {
    background: linear-gradient(135deg, var(--soft-blue) 0%, var(--dark-blue) 100%);
    color: var(--white);
    border-color: var(--dark-blue);
}

.report-content {
    display: none;
}

.report-content.active {
    display: block;
}

/* Pagination */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
    margin-top: 24px;
}

.pagination button {
    padding: 8px 16px;
    background: var(--white);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    color: var(--primary-slate);
    cursor: pointer;
    transition: all 0.3s ease;
}

.pagination button:hover:not(:disabled) {
    background: var(--off-white);
    border-color: var(--soft-blue);
}

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

.pagination button.active {
    background: var(--soft-blue);
    color: var(--white);
    border-color: var(--soft-blue);
}

.pagination span {
    font-size: 14px;
    color: var(--text-secondary);
}

/* Footer */
.footer {
    background: linear-gradient(135deg, var(--dark-slate) 0%, #1e293b 100%);
    color: rgba(255, 255, 255, 0.8);
    padding: 60px 0 24px;
    margin-top: 80px;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h4 {
    color: var(--white);
    font-size: 18px;
    margin-bottom: 16px;
    font-weight: 600;
}

.footer-section p {
    font-size: 14px;
    line-height: 1.8;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 12px;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: var(--soft-blue);
}

.footer-contact {
    list-style: none;
}

.footer-contact li {
    margin-bottom: 12px;
    font-size: 14px;
    display: flex;
    align-items: flex-start;
    gap: 8px;
}

.footer-contact i {
    color: var(--soft-blue);
    margin-top: 2px;
}

.social-links {
    display: flex;
    gap: 12px;
    margin-top: 20px;
}

.social-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    color: var(--white);
    transition: all 0.3s ease;
}

.social-links a:hover {
    background: var(--soft-blue);
    transform: translateY(-2px);
}

.footer-bottom {
    padding-top: 24px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
}

.footer-bottom p {
    font-size: 14px;
}

.footer-bottom i.fa-heart {
    color: var(--danger);
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    flex-direction: column;
    gap: 20px;
}

.loading-overlay.active {
    display: flex;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid rgba(255, 255, 255, 0.2);
    border-top-color: var(--soft-blue);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.loading-overlay p {
    color: var(--white);
    font-size: 16px;
    font-weight: 600;
}

/* Toast Notification */
.toast {
    position: fixed;
    bottom: 24px;
    right: 24px;
    background: linear-gradient(135deg, var(--success) 0%, #059669 100%);
    color: var(--white);
    padding: 16px 24px;
    border-radius: 8px;
    box-shadow: var(--shadow-xl);
    display: none;
    align-items: center;
    gap: 12px;
    z-index: 9999;
    animation: slideIn 0.3s ease;
}

.toast.active {
    display: flex;
}

.toast i {
    font-size: 20px;
}

@keyframes slideIn {
    from {
        transform: translateX(400px);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* Responsive Design */
@media (max-width: 1024px) {
    .chart-grid {
        grid-template-columns: 1fr;
    }
    
    .chart-card.full-width {
        grid-column: 1;
    }
}

@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 20px;
    }
    
    .nav {
        width: 100%;
        justify-content: center;
    }
    
    .nav-link {
        flex: 1;
        justify-content: center;
        padding: 12px 16px;
        font-size: 12px;
    }
    
    .page-header h1 {
        font-size: 28px;
    }
    
    .kpi-grid {
        grid-template-columns: 1fr;
    }
    
    .form-grid {
        grid-template-columns: 1fr;
    }
    
    .table-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .table-actions {
        width: 100%;
        flex-direction: column;
    }
    
    .search-input {
        width: 100%;
    }
    
    .report-tabs {
        flex-direction: column;
    }
    
    .report-tab {
        width: 100%;
        text-align: center;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }
    
    .page-header h1 {
        font-size: 24px;
    }
    
    .subtitle {
        font-size: 16px;
    }
    
    .kpi-value {
        font-size: 24px;
    }
    
    .form-card {
        padding: 20px;
    }
    
    .form-actions {
        flex-direction: column;
    }
    
    .form-actions button {
        width: 100%;
    }
}