/* 按钮样式 */
.btn {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-hover);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 13px;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.btn:hover {
    background: var(--bg-tertiary);
    border-color: var(--accent-blue);
}

.btn:active {
    transform: translateY(1px);
}

.btn:focus-visible {
    outline: 2px solid var(--border-focus);
    outline-offset: 2px;
}

.btn-primary {
    background: var(--accent-blue);
    border-color: var(--accent-blue);
    color: white;
}

.btn-primary:hover {
    background: var(--accent-blue-hover);
    border-color: var(--accent-blue-hover);
    box-shadow: var(--shadow-sm);
}

.btn-icon {
    padding: var(--spacing-xs);
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 16px;
    transition: color var(--transition-fast);
}

.btn-icon:hover {
    color: var(--text-primary);
}

.btn-icon:focus-visible {
    outline: 2px solid var(--border-focus);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

/* 右键菜单 */
.context-menu {
    position: fixed;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-xs) 0;
    min-width: 180px;
    z-index: 1000;
}

.menu-item {
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--text-primary);
    font-size: 13px;
    cursor: pointer;
    transition: background var(--transition-fast);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.menu-item:hover {
    background: var(--accent-blue);
}

.menu-separator {
    height: 1px;
    background: var(--border-color);
    margin: var(--spacing-xs) 0;
}

/* 模态对话框 */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    backdrop-filter: blur(2px);
}

.modal {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    min-width: 400px;
    max-width: 600px;
    max-height: 80vh;
    display: flex;
    flex-direction: column;
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
}

.modal-header h3 {
    font-size: 16px;
    font-weight: 600;
}

.modal-content {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-lg);
}

.modal-footer {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    border-top: 1px solid var(--border-color);
}

/* 表单样式 */
.form-row {
    margin-bottom: var(--spacing-md);
}

.form-row label {
    display: block;
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

.form-row input[type="text"],
.form-row input[type="number"],
.form-row select,
.form-row textarea {
    width: 100%;
    padding: var(--spacing-sm);
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 13px;
    transition: border-color var(--transition-fast);
}

.form-row input:focus,
.form-row select:focus,
.form-row textarea:focus {
    outline: none;
    border-color: var(--border-focus);
}

.form-row input[type="checkbox"] {
    margin-right: var(--spacing-xs);
}

.form-row input[type="range"] {
    width: 100%;
}

.form-row input[type="color"] {
    width: 60px;
    height: 30px;
    padding: 2px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    cursor: pointer;
}

.form-row .unit {
    display: inline-block;
    margin-left: var(--spacing-xs);
    font-size: 12px;
    color: var(--text-muted);
}

.form-row .expression-hint {
    margin-top: 4px;
    font-size: 12px;
    line-height: 1.4;
    color: var(--text-muted);
}

.form-row .expression-hint.ok {
    color: var(--success-green);
}

.form-row .expression-hint.error {
    color: var(--error-red);
}

.form-group {
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
}

.form-group input {
    flex: 1;
}

/* 工具提示 */
.tooltip {
    position: fixed;
    background: var(--bg-tertiary);
    color: var(--text-primary);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: 12px;
    pointer-events: none;
    z-index: 3000;
    box-shadow: var(--shadow-md);
    max-width: 200px;
}

/* 通知 */
.notification {
    position: fixed;
    top: 80px;
    right: 20px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-lg);
    z-index: 1500;
    max-width: 300px;
    animation: slideInRight 0.3s ease;
}

.notification.success {
    border-left: 4px solid var(--success-green);
}

.notification.error {
    border-left: 4px solid var(--error-red);
}

.notification.warning {
    border-left: 4px solid var(--warning-yellow);
}

.notification.info {
    border-left: 4px solid var(--info-blue);
}

/* 分隔线 */
hr {
    border: none;
    border-top: 1px solid var(--border-color);
    margin: var(--spacing-md) 0;
}

/* Markdown 题目板 */
.markdown-board {
    position: absolute;
    left: 80px;
    top: 70px;
    width: 420px;
    height: 320px;
    display: flex;
    flex-direction: column;
    --markdown-font-size: 13px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    z-index: 20;
    resize: both;
    overflow: hidden;
    min-width: 240px;
    min-height: 180px;
}

.markdown-board-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-sm) var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-tertiary);
    user-select: none;
    cursor: grab;
    touch-action: none;
}

.markdown-board-header:active {
    cursor: grabbing;
}

.markdown-board-title {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-primary);
}

.markdown-board-actions {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.markdown-font-input {
    width: 62px;
    padding: 2px 6px;
    height: 28px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 12px;
}

.markdown-font-input:focus-visible {
    outline: 2px solid var(--border-focus);
    outline-offset: 2px;
}

.markdown-tab {
    border-radius: var(--radius-sm);
}

.markdown-tab.active {
    color: var(--text-primary);
    background: var(--bg-hover);
    outline: 1px solid var(--border-color);
}

.markdown-board-body {
    flex: 1;
    overflow: hidden;
    display: flex;
    background: var(--bg-primary);
}

.markdown-input {
    flex: 1;
    width: 100%;
    height: 100%;
    padding: var(--spacing-md);
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-primary);
    font-size: var(--markdown-font-size, 13px);
    line-height: 1.5;
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
    resize: none;
    overflow: auto;
}

.markdown-preview {
    flex: 1;
    width: 100%;
    height: 100%;
    padding: var(--spacing-md);
    overflow: auto;
    color: var(--text-primary);
    font-size: var(--markdown-font-size, 13px);
    line-height: 1.6;
}

.markdown-board.mode-edit .markdown-preview {
    display: none;
}

.markdown-board.mode-preview .markdown-input {
    display: none;
}

.markdown-preview h1,
.markdown-preview h2,
.markdown-preview h3,
.markdown-preview h4,
.markdown-preview h5,
.markdown-preview h6 {
    margin: 0.4em 0 0.35em;
    line-height: 1.2;
}

.markdown-preview p {
    margin: 0.35em 0;
}

.markdown-preview ul,
.markdown-preview ol {
    padding-left: 1.3em;
    margin: 0.35em 0;
}

.markdown-preview blockquote {
    margin: 0.35em 0;
    padding: 0.25em 0.8em;
    border-left: 3px solid var(--border-color);
    background: rgba(0, 0, 0, 0.12);
}

.markdown-preview code {
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
    font-size: 0.92em;
    padding: 1px 4px;
    border-radius: 4px;
    background: rgba(0, 0, 0, 0.18);
}

.markdown-preview pre {
    margin: 0.45em 0;
    padding: 0.75em;
    border-radius: var(--radius-sm);
    background: rgba(0, 0, 0, 0.22);
    overflow: auto;
}

.markdown-preview pre code {
    padding: 0;
    background: transparent;
}

.markdown-preview a {
    color: var(--info-blue);
    text-decoration: underline;
}

/* 选中高亮 */
.selected-object {
    outline: 2px solid var(--accent-blue);
    outline-offset: 2px;
}

/* 拖拽预览 */
.drag-ghost {
    opacity: 0.5;
    filter: brightness(0.8);
}

@media (max-width: 600px) {
    .modal {
        min-width: unset;
        width: 92vw;
        max-width: 92vw;
    }

    .notification {
        right: 10px;
        left: 10px;
        max-width: unset;
    }
}