/* ===== 帮助弹窗 ===== */
.help-overlay {
    display: none;
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 3000;
    justify-content: center;
    align-items: center;
}
.help-overlay.show { display: flex; }
.help-modal {
    background: white;
    border-radius: 12px;
    padding: 0;
    width: 90%;
    max-width: 520px;
    max-height: 75vh;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}
.help-modal-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 14px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-shrink: 0;
}
.help-modal-header h3 { font-size: 16px; font-weight: 600; }
.help-modal-header .close-btn { background: none; border: none; color: white; font-size: 22px; cursor: pointer; }
.help-modal-body { padding: 18px 20px; overflow-y: auto; flex: 1; }
.help-section { margin-bottom: 14px; }
.help-section:last-child { margin-bottom: 0; }
.help-section h4 {
    font-size: 14px;
    font-weight: 600;
    color: #667eea;
    margin-bottom: 6px;
    display: flex;
    align-items: center;
    gap: 6px;
}
.help-section p,
.help-section ol {
    font-size: 13px;
    color: #555;
    line-height: 1.7;
    margin: 0;
}
.help-section ol { padding-left: 18px; }
.help-section ol li { margin-bottom: 3px; }
.help-tip {
    background: #fff8e1;
    border-left: 3px solid #ffc107;
    padding: 8px 12px;
    border-radius: 0 6px 6px 0;
    font-size: 12px;
    color: #856404;
    margin-top: 6px;
}