:root {
    --primary: #2563eb;
    --primary-dark: #1e40af;
    --bg-body: #f9fafb;
    --bg-card: #ffffff;
    --text-main: #111827;
    --text-muted: #6b7280;
    --border-color: #e5e7eb;
}

body {
    font-family: "Inter", system-ui, -apple-system, sans-serif;
    background-color: var(--bg-body);
    color: var(--text-main);
}

::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: #d1d5db; border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: #9ca3af; }

.flat-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
}

.flat-card.interactive:hover {
    border-color: #d1d5db;
    background-color: #fafafa;
}

.sidebar-link {
    transition: background-color 0.2s, color 0.2s;
    border-right: 3px solid transparent;
}

.sidebar-link:hover,
.sidebar-link.active {
    background-color: #f3f4f6;
    color: var(--primary);
    border-right-color: var(--primary);
}

.loader {
    border: 3px solid #f3f3f3;
    border-radius: 50%;
    border-top: 3px solid var(--primary);
    width: 24px;
    height: 24px;
    -webkit-animation: spin 1s linear infinite;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.drop-zone {
    border: 2px dashed #d1d5db;
    transition: background-color 0.2s ease, border-color 0.2s ease;
}

.drop-zone.dragover {
    border-color: var(--primary);
    background-color: #eff6ff;
}

/* AI Status Indicator */
.ai-badge {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.5rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 500;
}

.ai-badge.active { background-color: #dcfce7; color: #166534; }
.ai-badge.inactive { background-color: #f3f4f6; color: #6b7280; }
.ai-badge.loading { background-color: #dbeafe; color: #1e40af; }