.options-bar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 1.1rem;
    margin-bottom: 1rem;
    padding: 0.8rem 1rem;
    background: var(--feature-card-bg);
    border: 1px solid var(--input-border);
    border-radius: 10px;
}

.option-label {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    cursor: pointer;
    font-size: 0.9rem;
    color: var(--text-color);
    user-select: none;
    white-space: nowrap;
}

.option-label input[type="range"] {
    width: 90px;
    accent-color: #00dbde;
    cursor: pointer;
}

.option-label input[type="checkbox"] {
    width: 16px;
    height: 16px;
    accent-color: #00dbde;
    cursor: pointer;
}

.option-label input[type="color"] {
    width: 36px;
    height: 26px;
    border: 1px solid var(--input-border);
    border-radius: 6px;
    padding: 0;
    background: var(--input-bg);
    cursor: pointer;
}

.option-label span {
    min-width: 2.5ch;
    text-align: right;
    font-variant-numeric: tabular-nums;
}

.file-open-bar {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
    margin-bottom: 1.25rem;
}

.file-open-bar .toolbar-hint {
    font-size: 0.82rem;
    color: var(--text-color);
    opacity: 0.6;
    text-align: center;
    font-variant-numeric: tabular-nums;
}

/* 每文件一张卡片 */
.file-card {
    background: var(--feature-card-bg);
    border: 1px solid var(--input-border);
    border-radius: 10px;
    padding: 1rem 1.25rem;
    margin-bottom: 1.5rem;
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 0.6rem;
    margin-bottom: 0.9rem;
}

.card-header h2 {
    margin: 0;
    font-size: 1.05rem;
    color: var(--text-color);
    word-break: break-all;
}

.card-actions {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    flex-wrap: wrap;
}

.remove-file {
    background: transparent;
    border: 1px solid var(--input-border);
    color: var(--text-color);
    border-radius: 6px;
    width: 30px;
    height: 30px;
    cursor: pointer;
    font-size: 16px;
    line-height: 1;
    transition: all 0.25s ease;
}

.remove-file:hover {
    background: rgba(220, 53, 69, 0.15);
    border-color: #dc3545;
    color: #dc3545;
}

.editor-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

.editor-pane,
.preview-pane {
    display: flex;
    flex-direction: column;
    background: var(--feature-card-bg);
    border-radius: 10px;
    border: 1px solid var(--input-border);
    padding: 1rem 1.25rem;
}

.editor-pane h3,
.preview-pane h3 {
    margin: 0 0 0.75rem;
    font-size: 0.95rem;
    color: var(--text-color);
    opacity: 0.75;
}

.editor-toolbar {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    flex-wrap: wrap;
    margin-bottom: 0.75rem;
}

.mdEditor {
    flex: 1;
    min-height: 420px;
    resize: vertical;
    width: 100%;
    box-sizing: border-box;
    padding: 0.9rem 1rem;
    border: 1px solid var(--input-border);
    border-radius: 8px;
    background: var(--input-bg);
    color: var(--input-text);
    font-family: "Sarasa Fixed SC", "Sarasa Mono SC", "Noto Sans Mono CJK SC", "NSimSun", Consolas, "Courier New", monospace;
    font-size: 15px;
    line-height: 1.6;
    white-space: pre;
    overflow-wrap: normal;
    tab-size: 4;
}

.mdEditor:focus {
    outline: none;
    border-color: #00dbde;
}

.image-box {
    position: relative;
    flex: 1;
    min-height: 420px;
    background: repeating-conic-gradient(#ccc 0% 25%, #fff 0% 50%) 50% / 16px 16px;
    border-radius: 10px;
    border: 1px solid var(--input-border);
    overflow: auto;
    display: flex;
    align-items: flex-start;
    justify-content: flex-start;
    padding: 1rem;
}

.image-box canvas {
    max-width: 100%;
    display: block;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.count-info {
    font-size: 0.85rem;
    color: var(--text-color);
    opacity: 0.7;
    font-variant-numeric: tabular-nums;
}

.btn.secondary {
    padding: 9px 14px;
    background-color: var(--button-bg);
    color: var(--button-text);
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    transition: all 0.3s ease;
    white-space: nowrap;
}

.btn.secondary:hover {
    background-color: var(--button-hover);
    transform: translateY(-2px);
}

.btn.small {
    padding: 6px 12px;
    font-size: 13px;
}

.action-bar {
    display: flex;
    gap: 1rem;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
}

@media (max-width: 900px) {
    .editor-layout {
        grid-template-columns: 1fr;
    }
}