.brush-selector-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s, visibility 0.3s;
}

.brush-selector-modal.active {
    opacity: 1;
    visibility: visible;
}

.brush-selector-content {
    background-color: #2c2c2c;
    border-radius: 8px;
    padding: 20px;
    width: 90%;
    max-width: 600px;
    max-height: 80vh;
    overflow-y: auto;
    color: #e0e0e0;
}

.brush-selector-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
}

.brush-selector-header h3 {
    font-size: 18px;
    color: #e0e0e0;
}

.close-btn {
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: #b0b0b0;
}

.brush-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 15px;
    margin-bottom: 20px;
}

.brush-option {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 10px;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.2s;
}

.brush-option:hover {
    background-color: #3c3c3c;
}

.brush-option.selected {
    background-color: #1e3a5f;
}

.brush-option canvas {
    width: 80px;
    height: 80px;
    margin-bottom: 8px;
}

.brush-option-name {
    font-size: 12px;
    text-align: center;
    color: #b0b0b0;
}

.custom-brush-upload {
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px solid #3c3c3c;
}

.custom-brush-upload label {
    display: block;
    margin-bottom: 10px;
    font-size: 14px;
    color: #b0b0b0;
}

.custom-brush-upload input[type="file"] {
    display: none;
}

.upload-btn {
    background-color: #2196F3;
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    display: inline-block;
}

.upload-btn:hover {
    background-color: #1976D2;
}

/* ============ 更新提示弹窗 ============ */
.update-modal-content {
    max-width: 420px;
    max-height: 70vh;
}

.update-modal-body {
    font-size: 13px;
    line-height: 1.6;
    color: #c8c8c8;
    max-height: 240px;
    overflow-y: auto;
    margin-bottom: 10px;
}

.update-modal-body .update-section-title {
    font-size: 12px;
    font-weight: bold;
    margin: 8px 0 4px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    background: #383838;
    padding: 2px 6px;
    border-radius: 3px;
    display: inline-block;
}

.update-modal-body .update-item {
    margin: 3px 0;
    padding-left: 4px;
}

.update-changelog-link {
    display: block;
    font-size: 12px;
    color: #5b9bd5;
    text-decoration: none;
    margin-bottom: 14px;
}

.update-changelog-link:hover {
    text-decoration: underline;
}

.update-modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
}

.update-btn-later,
.update-btn-dismiss {
    background: none;
    border: 1px solid #555;
    color: #b0b0b0;
    padding: 6px 12px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 13px;
}

.update-btn-later:hover,
.update-btn-dismiss:hover {
    background-color: #3c3c3c;
}

.update-btn-refresh {
    background-color: #2196F3;
    border: none;
    color: white;
    padding: 6px 14px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 13px;
}

.update-btn-refresh:hover {
    background-color: #1976D2;
}

.alert-modal-content {
    text-align: center;
    padding: 16px 14px 14px;
    max-width: 80%;
    width: auto;
}

.alert-modal-content p {
    margin: 0 0 16px;
    font-size: 14px;
    color: #e0e0e0;
}

.alert-ok-btn {
    background-color: #2196F3;
    border: none;
    color: white;
    padding: 6px 24px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 13px;
}

.alert-ok-btn:hover {
    background-color: #1976D2;
}