:root {
    --primary: #2563eb;
}

body {
    font-family: sans-serif;
    max-width: 900px;
    margin: 20px auto;
    padding: 20px;
    background: #f8fafc;
}

.card {
    background: white;
    padding: 25px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

#drop_zone {
    border: 2px dashed #cbd5e1;
    border-radius: 8px;
    padding: 30px;
    text-align: center;
    color: #64748b;
    margin-bottom: 15px;
    cursor: pointer;
    background: #fff;
}

#drop_zone.dragging {
    border-color: var(--primary);
    background: #eff6ff;
}

textarea {
    width: 100%;
    height: 150px;
    margin-bottom: 10px;
    padding: 10px;
    box-sizing: border-box;
    border: 1px solid #ccc;
}

#output {
    background: white;
    border: 1px solid #e2e8f0;
    padding: 20px;
    min-height: 150px;
    font-family: "Times New Roman", serif;
    margin-top: 10px;
}

.citation-item {
    margin-bottom: 1em;
}

b {
    font-weight: bold !important;
}

i {
    font-style: italic !important;
}

.loading {
    color: var(--primary);
    font-weight: bold;
}

.portal-btn {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    font-size: 12px;
    color: #64748b;
    text-decoration: none;
    padding: 4px 10px;
    border: 1px solid #e2e8f0;
    border-radius: 5px;
    margin-bottom: 16px;
    background: #f8fafc;
    transition: border-color 0.15s, color 0.15s;
}

.portal-btn:hover {
    color: var(--primary);
    border-color: var(--primary);
}