:root {
    --bg-dark: #0f172a;
    --bg-card: #1e293b;
    --bg-sidebar: #090d16;
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --accent-cyan: #06b6d4;
    --accent-green: #10b981;
    --accent-purple: #8b5cf6;
    --accent-yellow: #f59e0b;
    --accent-red: #ef4444;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --border-color: #334155;
    --font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
}

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

body {
    background-color: var(--bg-dark);
    color: var(--text-main);
    font-family: var(--font-family);
    line-height: 1.5;
    overflow-x: hidden;
}

.app-container {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: 260px;
    background-color: var(--bg-sidebar);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    padding: 20px 16px;
    flex-shrink: 0;
}

.brand {
    display: flex;
    flex-direction: column;
    gap: 4px;
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border-color);
}

.brand h2 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-main);
}

.brand-icon {
    font-size: 1.8rem;
    color: var(--primary-color);
    margin-bottom: 4px;
}

.version-tag {
    font-size: 0.75rem;
    color: var(--accent-cyan);
    background: rgba(6, 182, 212, 0.1);
    padding: 2px 8px;
    border-radius: 12px;
    width: fit-content;
}

.nav-menu {
    display: flex;
    flex-direction: column;
    gap: 8px;
    flex: 1;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: transparent;
    border: none;
    border-radius: 8px;
    color: var(--text-muted);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: left;
}

.nav-item:hover {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-main);
}

.nav-item.active {
    background: var(--primary-color);
    color: #fff;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

.sidebar-footer {
    margin-top: auto;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.btn-sync {
    width: 100%;
    background: rgba(16, 185, 129, 0.15);
    color: var(--accent-green);
    border: 1px solid rgba(16, 185, 129, 0.3);
    padding: 10px;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.2s ease;
}

.btn-sync:hover {
    background: var(--accent-green);
    color: #000;
}

.sync-status {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-align: center;
}

/* Main Content */
.main-content {
    flex: 1;
    padding: 32px;
    overflow-y: auto;
}

.tab-content {
    display: none;
}

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

.content-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    flex-wrap: wrap;
    gap: 16px;
}

.content-header h1 {
    font-size: 1.6rem;
    font-weight: 700;
}

.subtitle {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-top: 4px;
}

/* Buttons & Inputs */
.btn {
    padding: 8px 16px;
    border-radius: 6px;
    border: none;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

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

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

.btn-secondary {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-main);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.15);
}

.filter-group {
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--bg-card);
    padding: 4px 8px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.filter-label {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.btn-filter {
    background: transparent;
    color: var(--text-muted);
    border: none;
    padding: 6px 12px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.85rem;
}

.btn-filter.active {
    background: var(--primary-color);
    color: #fff;
}

.form-input, .form-select {
    background: var(--bg-dark);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 0.9rem;
    outline: none;
}

.form-input:focus, .form-select:focus {
    border-color: var(--primary-color);
}

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

.kpi-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
    display: flex;
    align-items: center;
    gap: 16px;
}

.kpi-icon {
    width: 48px;
    height: 48px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
}

.icon-money { background: rgba(99, 102, 241, 0.15); color: var(--primary-color); }
.icon-truck { background: rgba(6, 182, 212, 0.15); color: var(--accent-cyan); }
.icon-clip { background: rgba(16, 185, 129, 0.15); color: var(--accent-green); }

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

.kpi-label {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.kpi-info h3 {
    font-size: 1.4rem;
    font-weight: 700;
    margin-top: 2px;
}

.charts-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 20px;
    margin-bottom: 24px;
}

@media (max-width: 1024px) {
    .charts-grid { grid-template-columns: 1fr; }
}

.chart-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
}

.chart-card h3 {
    font-size: 1rem;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.chart-wrapper {
    position: relative;
    height: 300px;
    width: 100%;
}

/* Tables */
.table-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    margin-bottom: 24px;
}

.table-header {
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

.data-table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
    font-size: 0.9rem;
}

.data-table th, .data-table td {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-color);
}

.data-table th {
    background: rgba(0, 0, 0, 0.2);
    color: var(--text-muted);
    font-weight: 600;
}

.data-table tbody tr:hover {
    background: rgba(255, 255, 255, 0.02);
}

/* Editable Cell Hint */
.editable-plate {
    cursor: pointer;
    position: relative;
    transition: background-color 0.2s ease;
}

.editable-plate:hover {
    background-color: rgba(99, 102, 241, 0.15);
}

.edit-hint-icon {
    font-size: 0.8rem;
    color: var(--text-muted);
    opacity: 0.4;
    margin-left: 6px;
    transition: opacity 0.2s ease;
}

.editable-plate:hover .edit-hint-icon {
    opacity: 1;
    color: var(--primary-color);
}

.editable-grid td.editable {
    cursor: pointer;
    position: relative;
}

.editable-grid td.editable:hover {
    background: rgba(99, 102, 241, 0.1);
    outline: 1px dashed var(--primary-color);
}

.cell-editor {
    width: 100%;
    background: var(--bg-dark);
    border: 1px solid var(--primary-color);
    color: #fff;
    padding: 4px 8px;
    border-radius: 4px;
}

/* Badges */
.badge {
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
    display: inline-block;
}

.badge-success { background: rgba(16, 185, 129, 0.15); color: var(--accent-green); }
.badge-warning { background: rgba(245, 158, 11, 0.15); color: var(--accent-yellow); }
.badge-danger { background: rgba(239, 68, 68, 0.15); color: var(--accent-red); }
.badge-purple { background: rgba(139, 92, 246, 0.15); color: var(--accent-purple); }
.badge-cyan { background: rgba(6, 182, 212, 0.15); color: var(--accent-cyan); }

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    width: 90%;
    max-width: 500px;
    overflow: hidden;
}

.modal-header {
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.close-modal {
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-muted);
}

.modal-body {
    padding: 20px;
}

.modal-footer {
    padding: 16px 20px;
    border-top: 1px solid var(--border-color);
    text-align: right;
}

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

.pagination-info {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* Settings Form */
.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
    margin-bottom: 16px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.form-group label {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 24px;
    margin-bottom: 24px;
}

.card-desc {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 16px;
}

.divider {
    border: 0;
    height: 1px;
    background: var(--border-color);
    margin: 24px 0;
}

/* Timeline */
.timeline {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-top: 16px;
}

.timeline-item {
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--border-color);
    border-left: 4px solid var(--primary-color);
    padding: 16px;
    border-radius: 8px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.timeline-item.high-cost {
    border-left-color: var(--accent-red);
    background: rgba(239, 68, 68, 0.05);
}