.upload-container {
    border: 2px dashed #ccc;
    border-radius: 8px;
    padding: 30px;
    text-align: center;
    background-color: #f8f9fa;
    cursor: pointer;
    margin-bottom: 20px;
    transition: all 0.3s ease;
}

.upload-container:hover {
    border-color: #0d6efd;
    background-color: #f1f8ff;
}

.upload-icon {
    font-size: 48px;
    color: #6c757d;
    margin-bottom: 15px;
}

.file-selected {
    border-color: #28a745;
    background-color: #f0fff4;
}

.file-selected .upload-icon {
    color: #28a745;
}

#file-name {
    font-weight: 500;
    margin-top: 10px;
    color: #495057;
}

.progress-container {
    display: none;
    margin: 20px 0;
}

.instructions {
    border-left: 4px solid #0d6efd;
    padding: 10px 15px;
    background-color: #f8f9fa;
    margin-bottom: 20px;
}

.instructions h4 {
    color: #0d6efd;
    margin-top: 0;
}

.instructions ul {
    padding-left: 20px;
    margin-bottom: 0;
}

.sample-download {
    margin-bottom: 20px;
}

.alert {
    position: relative;
    padding: 1rem;
    margin-bottom: 1rem;
    border: 1px solid transparent;
    border-radius: 0.25rem;
}

.alert-info {
    color: #055160;
    background-color: #cff4fc;
    border-color: #b6effb;
}

.alert-success {
    color: #0f5132;
    background-color: #d1e7dd;
    border-color: #badbcc;
}

.alert-danger {
    color: #842029;
    background-color: #f8d7da;
    border-color: #f5c2c7;
}

/* Bootstrap Icons */
@import url("https://cdn.jsdelivr.net/npm/bootstrap-icons@1.10.0/font/bootstrap-icons.css");

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.badge {
    animation: fadeIn 0.3s ease;
}

/* Group Selection Styles */
.group-search-container {
    position: relative;
}

.group-dropdown {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    max-height: 300px;
    overflow-y: auto;
    background: white;
    border: 1px solid #ddd;
    border-radius: 4px;
    z-index: 1000;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    display: none;
}

.group-dropdown.show {
    display: block;
}

.group-item {
    padding: 12px 15px;
    cursor: pointer;
    border-bottom: 1px solid #f0f0f0;
    transition: background-color 0.2s;
}

.group-item:hover {
    background-color: #f8f9fa;
}

.group-item.selected {
    background-color: #e7f5ff;
    color: #0066cc;
}

.group-item:last-child {
    border-bottom: none;
}

.no-results {
    padding: 20px;
    text-align: center;
    color: #999;
}

.selected-groups-container {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 15px;
}

.group-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 10px 15px;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.group-badge:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(102, 126, 234, 0.3);
}

.group-badge .remove-btn {
    background: rgba(255, 255, 255, 0.3);
    border: none;
    color: white;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 14px;
    transition: background 0.2s;
}

.group-badge .remove-btn:hover {
    background: rgba(255, 255, 255, 0.5);
}

.empty-groups-message {
    padding: 20px;
    text-align: center;
    color: #999;
    border: 2px dashed #ddd;
    border-radius: 8px;
    margin-top: 15px;
}

/* ── How It Works ── */
.fw-how-it-works { border: 1px solid #e2e8f0; border-radius: 12px; background: #fff; overflow: hidden; }
.fw-hiw-toggle { display: flex; align-items: center; justify-content: space-between; padding: 14px 20px; font-weight: 600; font-size: 0.95em; color: #334155; text-decoration: none !important; cursor: pointer; transition: background 0.2s; }
.fw-hiw-toggle:hover { background: #f8fafc; color: #334155; }
.fw-hiw-toggle[aria-expanded="true"] .fw-hiw-arrow { transform: rotate(180deg); }
.fw-hiw-arrow { font-size: 0.75em; transition: transform 0.3s ease; color: #94a3b8; }
.fw-hiw-body { padding: 0 20px 20px; }
.fw-hiw-steps { display: flex; flex-direction: column; gap: 16px; }
.fw-hiw-step { display: flex; align-items: flex-start; gap: 14px; }
.fw-hiw-step-icon { flex-shrink: 0; width: 36px; height: 36px; border-radius: 10px; background: linear-gradient(135deg, var(--primary), color-mix(in srgb, var(--primary) 70%, #000)); color: #fff; display: flex; align-items: center; justify-content: center; font-size: 14px; }
.fw-hiw-step strong { display: block; font-size: 0.9em; color: #1e293b; margin-bottom: 2px; }
.fw-hiw-step p { margin: 0; font-size: 0.82em; color: #64748b; line-height: 1.5; }