/* 边学边查 — 主站仅保留浮动启动钮，不遮挡阅读 */
.fe-research-root {
    position: fixed;
    z-index: 3150;
    user-select: none;
    touch-action: none;
}

.fe-research-fab {
    border: 1px solid var(--border-color, #d0d7de);
    background: var(--bg-secondary, #fff);
    color: var(--text-primary, #1f2328);
    box-shadow: 0 8px 24px rgba(15, 23, 42, 0.14);
    border-radius: 999px;
    padding: 10px 14px;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    cursor: grab;
    font-size: 13px;
    font-weight: 600;
    line-height: 1;
    transition: opacity 0.2s ease, transform 0.15s ease;
}

.fe-research-fab:active {
    cursor: grabbing;
}

.fe-research-fab__icon {
    font-size: 16px;
    line-height: 1;
}

.fe-research-root.is-dragging .fe-research-fab {
    opacity: 0.92;
    transform: scale(1.02);
}

.fe-research-root.is-open .fe-research-fab {
    box-shadow: 0 0 0 2px var(--primary-color, #0969da);
}