/* Sidebar */
.sidebar-col {
    background-color: #2c3e50;
    min-height: 100vh;
    padding: 0;
}

.sidebar {
    padding: 0;
}

.sidebar-title {
    color: #ecf0f1;
    padding: 1.2rem 1rem 0.5rem 1rem;
    margin: 0;
    font-size: 1rem;
    font-weight: 600;
    letter-spacing: 0.03em;
    text-transform: uppercase;
}

.sidebar-divider {
    border-color: #3d5166;
    margin: 0.5rem 1rem 0.5rem 1rem;
}

.sidebar .nav-link {
    color: #bdc3c7;
    padding: 0.55rem 1rem;
    border-radius: 0;
    font-size: 0.9rem;
    transition: background-color 0.15s, color 0.15s;
}

.sidebar .nav-link:hover {
    color: #ecf0f1;
    background-color: #34495e;
}

.sidebar .nav-link.active {
    color: #fff;
    background-color: #18bc9c;
}

/* Main content */
.main-content {
    padding: 2rem 2.5rem;
}

/* Upload area */
.upload-area {
    border: 2px dashed #ced4da;
    border-radius: 6px;
    padding: 2rem;
    text-align: center;
    cursor: pointer;
    color: #6c757d;
    background-color: #f8f9fa;
    transition: border-color 0.15s, background-color 0.15s;
}

.upload-area:hover {
    border-color: #18bc9c;
    background-color: #f0faf8;
    color: #2c3e50;
}

/* Card section headers */
.section-card {
    margin-bottom: 1.5rem;
    box-shadow: 0 1px 4px rgba(0,0,0,0.07);
}

/* DataTable improvements */
.dash-table-container .dash-spreadsheet-container .dash-spreadsheet-inner th {
    background-color: #f8f9fa;
    font-weight: 600;
}

/* Metric boxes */
.metric-box {
    background-color: #f8f9fa;
    border-left: 4px solid #18bc9c;
    padding: 1rem 1.25rem;
    border-radius: 0 4px 4px 0;
    margin-bottom: 0.75rem;
}

.metric-value {
    font-size: 2rem;
    font-weight: 700;
    color: #2c3e50;
    line-height: 1;
}

.metric-label {
    color: #6c757d;
    font-size: 0.85rem;
    margin-top: 0.25rem;
}

/* Combo requirement list */
.req-item {
    background-color: #f8f9fa;
    border: 1px solid #dee2e6;
    border-radius: 4px;
    padding: 0.5rem 0.75rem;
    margin-bottom: 0.4rem;
}

.combo-item {
    border: 1px solid #dee2e6;
    border-radius: 6px;
    padding: 0.75rem 1rem;
    margin-bottom: 0.6rem;
    background-color: #fff;
}