/* ========================================
   全局样式与变量
   ======================================== */
:root {
    /* 主题色 */
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --primary-light: #eff6ff;
    --accent-color: #0ea5e9;
    --accent-hover: #0284c7;

    /* 中性色 */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-tertiary: #94a3b8;
    --border-color: #e2e8f0;

    /* 状态色 */
    --success-color: #22c55e;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --info-color: #3b82f6;

    /* 阴影 */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

    /* 圆角 */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;

    /* 间距 */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;

    /* 过渡 */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Microsoft YaHei', sans-serif;
    font-size: 14px;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-secondary);
    overflow-x: hidden;
}

/* ========================================
   布局
   ======================================== */
.app-container {
    display: flex;
    height: 100vh;
    overflow: hidden;
}

.sidebar {
    width: 320px;
    background: var(--bg-primary);
    border-right: 1px solid var(--border-color);
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-md);
}

.sidebar::-webkit-scrollbar {
    width: 6px;
}

.sidebar::-webkit-scrollbar-track {
    background: transparent;
}

.sidebar::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
}

.sidebar::-webkit-scrollbar-thumb:hover {
    background: var(--text-tertiary);
}

.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* ========================================
   侧边栏
   ======================================== */
.sidebar-header {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
    background: #1e293b;
    color: #f1f5f9;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    /* margin-bottom: var(--spacing-sm); Removed as per layout update */
}

.logo svg {
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.1));
}

.logo h1 {
    font-size: 20px;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.subtitle {
    font-size: 12px;
    opacity: 0.9;
    font-weight: 400;
}

.section {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
}

.section:last-child {
    border-bottom: none;
}

.section-title {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* ========================================
   表单元素
   ======================================== */
.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group:last-child {
    margin-bottom: 0;
}

.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
}

.text-input,
.textarea-input,
.select-input {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 14px;
    font-family: inherit;
    color: var(--text-primary);
    background: var(--bg-primary);
    transition: all var(--transition-fast);
}

.text-input:focus,
.textarea-input:focus,
.select-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px var(--primary-light);
}

.textarea-input {
    resize: vertical;
    min-height: 60px;
}

.textarea-input.large {
    min-height: 100px;
}

.select-input {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg width='12' height='8' viewBox='0 0 12 8' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1L6 6L11 1' stroke='%234a5568' stroke-width='2' stroke-linecap='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 36px;
}

/* ========================================
   按钮
   ======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: 10px 20px;
    border: none;
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 500;
    font-family: inherit;
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-primary:active:not(:disabled) {
    transform: translateY(0);
}

.btn-accent {
    background: var(--accent-color);
    color: white;
    box-shadow: var(--shadow-sm);
}

.btn-accent:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--border-color);
}

.btn-danger {
    background: var(--danger-color);
    color: white;
}

.btn-danger:hover:not(:disabled) {
    background: #dc2626;
}

.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
}

.btn-ghost:hover:not(:disabled) {
    background: var(--bg-tertiary);
}

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

.btn-large {
    padding: 14px 28px;
    font-size: 15px;
    font-weight: 600;
}

.button-group {
    display: flex;
    gap: var(--spacing-sm);
}

.button-row {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.action-buttons {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

/* ========================================
   预设控制
   ======================================== */
.preset-controls {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

/* ========================================
   顶部栏
   ======================================== */
.top-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg) var(--spacing-xl);
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}

.top-bar h2 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
}

/* ========================================
   生成区域
   ======================================== */
.generate-section {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-xl);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.generate-section::-webkit-scrollbar {
    width: 8px;
}

.generate-section::-webkit-scrollbar-track {
    background: transparent;
}

.generate-section::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

.generate-section::-webkit-scrollbar-thumb:hover {
    background: var(--text-tertiary);
}

/* ========================================
   卡片
   ======================================== */
.card {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    transition: box-shadow var(--transition-base);
}

.card:hover {
    box-shadow: var(--shadow-lg);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.card-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.card-actions {
    display: flex;
    gap: var(--spacing-sm);
}

/* ========================================
   图片上传
   ======================================== */
.image-upload-area {
    margin-top: var(--spacing-md);
}

.image-preview {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.image-preview-item {
    position: relative;
    width: 120px;
    height: 120px;
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 2px solid var(--border-color);
    transition: all var(--transition-fast);
}

.image-preview-item:hover {
    border-color: var(--primary-color);
    transform: scale(1.05);
}

.image-preview-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.image-preview-item .remove-btn {
    position: absolute;
    top: 4px;
    right: 4px;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: rgba(0, 0, 0, 0.6);
    color: white;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.image-preview-item:hover .remove-btn {
    opacity: 1;
}

/* ========================================
   进度条
   ======================================== */
.progress-bar {
    margin-top: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--primary-light);
    border-radius: var(--radius-md);
    position: relative;
    overflow: hidden;
}

.progress-fill {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    animation: progress 2s ease-in-out infinite;
}

@keyframes progress {
    0% {
        width: 0%;
    }

    50% {
        width: 70%;
    }

    100% {
        width: 100%;
    }
}

.progress-text {
    position: relative;
    z-index: 1;
    font-size: 13px;
    font-weight: 500;
    color: var(--primary-color);
}

/* ========================================
   JSON预览
   ======================================== */
.json-preview {
    min-height: 300px;
    max-height: 600px;
    overflow-y: auto;
    background: #1e1e1e;
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 13px;
    line-height: 1.6;
    color: #d4d4d4;
}

.json-preview::-webkit-scrollbar {
    width: 8px;
}

.json-preview::-webkit-scrollbar-track {
    background: #2d2d2d;
}

.json-preview::-webkit-scrollbar-thumb {
    background: #555;
    border-radius: 4px;
}

.json-preview pre {
    margin: 0;
    white-space: pre-wrap;
    word-wrap: break-word;
}

/* ========================================
   空状态
   ======================================== */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl);
    color: var(--text-tertiary);
    text-align: center;
    min-height: 200px;
}

.empty-state svg {
    margin-bottom: var(--spacing-md);
    color: var(--text-tertiary);
}

.empty-state p {
    margin: var(--spacing-xs) 0;
}

.empty-state .hint {
    font-size: 12px;
    opacity: 0.7;
}

/* ========================================
   生图预览
   ======================================== */
.image-generate-preview {
    min-height: 300px;
    border-radius: var(--radius-md);
    background: var(--bg-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
}

.image-generate-preview img {
    max-width: 100%;
    border-radius: var(--radius-md);
}

/* ========================================
   模态框
   ======================================== */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    animation: fadeIn var(--transition-base);
}

.modal.active {
    display: flex;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

.modal-content {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    width: 90%;
    max-width: 500px;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-xl);
    animation: slideUp var(--transition-base);
}

@keyframes slideUp {
    from {
        transform: translateY(20px);
        opacity: 0;
    }

    to {
        transform: translateY(0);
        opacity: 1;
    }
}

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

.modal-header h3 {
    font-size: 18px;
    font-weight: 600;
}

.modal-close {
    background: none;
    border: none;
    font-size: 24px;
    color: var(--text-tertiary);
    cursor: pointer;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.modal-close:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

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

.modal-footer {
    display: flex;
    flex-shrink: 0;
    justify-content: flex-end;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
}

.provider-status {
    padding: 8px 10px;
    border-radius: var(--radius-md);
    background: var(--primary-light);
    color: var(--primary-color);
    font-size: 12px;
    font-weight: 600;
    border: 1px solid var(--border-color);
}

/* ========================================
   Toast 提示
   ======================================== */
.toast {
    position: fixed;
    bottom: var(--spacing-xl);
    right: var(--spacing-xl);
    background: var(--text-primary);
    color: white;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    z-index: 2000;
    opacity: 0;
    transform: translateY(20px);
    transition: all var(--transition-base);
    pointer-events: none;
}

.toast.show {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

.toast.success {
    background: var(--success-color);
}

.toast.error {
    background: var(--danger-color);
}

.toast.warning {
    background: var(--warning-color);
}

/* ========================================
   响应式设计
   ======================================== */

/* 汉堡菜单按钮 - 桌面端隐藏 */
.sidebar-toggle-btn {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    padding: 6px;
    border-radius: var(--radius-sm);
    transition: background var(--transition-fast);
    flex-shrink: 0;
}
.sidebar-toggle-btn:hover {
    background: var(--bg-tertiary);
}

/* 遮罩层 - 桌面端隐藏 */
.sidebar-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 99;
    opacity: 0;
    transition: opacity var(--transition-base);
}
.sidebar-overlay.active {
    display: block;
    opacity: 1;
}

@media (max-width: 1024px) {
    .sidebar {
        width: 280px;
    }
}

/* === 竖屏 / 平板 / 手机适配 === */
@media (max-width: 768px) {
    .app-container {
        flex-direction: column;
        position: relative;
    }

    /* 侧边栏变为抽屉式覆盖层 */
    .sidebar {
        position: fixed;
        top: 0;
        left: 0;
        width: 300px;
        max-width: 85vw;
        height: 100vh;
        max-height: none;
        z-index: 100;
        transform: translateX(-100%);
        transition: transform var(--transition-base);
        border-right: 1px solid var(--border-color);
        border-bottom: none;
    }
    .sidebar.open {
        transform: translateX(0);
    }

    /* 显示汉堡按钮 */
    .sidebar-toggle-btn {
        display: flex;
        align-items: center;
        justify-content: center;
    }

    /* 主内容区占满 */
    .main-content {
        width: 100%;
        height: 100vh;
    }

    /* 工具栏换行 */
    .tools-bar {
        flex-wrap: wrap;
        padding: 8px;
        gap: 6px;
    }
    .sub-tools {
        flex-wrap: wrap;
        gap: 4px;
    }
    .sub-tools .btn {
        font-size: 12px;
        padding: 5px 8px;
    }

    /* Tab 导航：更紧凑，可横向滚动 */
    .tabs-nav {
        padding: 0 var(--spacing-sm);
        -webkit-overflow-scrolling: touch;
    }
    .tab-btn {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: 13px;
    }

    /* 表单网格：强制单列 */
    .form-grid {
        grid-template-columns: 1fr !important;
    }
    .form-grid .form-group[style*="grid-column: span 2"] {
        grid-column: span 1 !important;
    }

    /* 预览区域：单列 */
    .preview-area-row {
        grid-template-columns: 1fr !important;
        height: auto;
        max-height: 60vh;
        overflow-y: auto;
    }
    .preview-area-row .preview-pane {
        min-height: 200px;
    }
    .result-preview {
        min-height: 250px;
    }

    /* 模态框：更适合小屏 */
    .modal-content {
        width: 95% !important;
        max-width: none !important;
        max-height: 90vh;
        overflow-y: auto;
    }
    /* AI 对话框内部：竖向堆叠 */
    #aiModal .modal-body {
        flex-direction: column !important;
        height: auto !important;
        max-height: 65vh;
        overflow-y: auto;
    }
    #aiModal .modal-body > div {
        flex: none !important;
        min-height: auto !important;
    }

    /* 模态框底部按钮 */
    .modal-footer {
        flex-wrap: wrap;
        gap: var(--spacing-sm);
    }

    /* 图片预览项缩小 */
    .image-preview-item {
        width: 80px;
        height: 80px;
    }

    /* 按钮行 */
    .button-row {
        flex-direction: column;
    }
}

/* === 极小屏幕（手机竖屏）=== */
@media (max-width: 480px) {
    .sidebar {
        width: 100vw;
        max-width: none;
    }

    .tools-bar {
        padding: 6px;
    }
    .toolbar-title {
        font-size: 14px;
    }

    .tab-btn {
        padding: var(--spacing-xs) var(--spacing-sm);
        font-size: 12px;
    }

    .tab-content-container {
        padding: var(--spacing-sm);
    }

    .preview-area-row {
        padding: var(--spacing-sm);
    }

    #generateImageBtn.sidebar-btn {
        font-size: 14px;
        padding: 10px;
    }

    .image-preview-item {
        width: 60px;
        height: 60px;
    }

    /* 全屏图片预览 */
    #imagePreviewModal .modal-content {
        padding: 0 !important;
        border-radius: 0 !important;
    }
}

/* ========================================
   动画效果
   ======================================== */
@keyframes pulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.5;
    }
}

.loading {
    animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

/* ========================================
   语法高亮（JSON）
   ======================================== */
.json-key {
    color: #9cdcfe;
}

.json-string {
    color: #ce9178;
}

.json-number {
    color: #b5cea8;
}

.json-boolean {
    color: #569cd6;
}

.json-null {
    color: #569cd6;
}

/* ========================================
   Diff View Styles
   ======================================== */
.diff-container {
    flex: 1;
    overflow-y: auto;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-sm);
    display: none; /* Hidden by default */
}

.diff-item {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-sm);
    padding: var(--spacing-sm);
    transition: all var(--transition-fast);
}

.diff-item:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-sm);
}

.diff-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
    font-weight: 600;
    font-size: 13px;
    color: var(--text-primary);
}

.diff-path {
    color: var(--text-secondary);
    font-family: monospace;
}

.diff-content {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 13px;
    padding-left: 24px; /* Align with header text (checkbox width) */
    flex-wrap: wrap;
}

.diff-old {
    color: var(--danger-color);
    text-decoration: line-through;
    background: #fef2f2;
    padding: 2px 4px;
    border-radius: 2px;
}

.diff-new {
    color: var(--success-color);
    background: #f0fdf4;
    padding: 2px 4px;
    border-radius: 2px;
}

.diff-arrow {
    color: var(--text-tertiary);
    font-size: 12px;
}

.diff-item.unchecked {
    opacity: 0.6;
    background: var(--bg-tertiary);
}

/* Layout Updates */
.tools-bar {
    display: flex;
    gap: 10px;
    padding: 10px;
    background: rgba(255, 255, 255, 0.8);
    border-radius: 8px;
    align-items: center;
}

.prompt-preview-section {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.image-gen-section {
    display: flex;
    flex-direction: column;
    gap: 20px;
    background: var(--bg-primary);
    padding: 24px;
    border-radius: 12px;
    box-shadow: var(--shadow-md);
}

.gen-controls {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
}

.gen-btn-container {
    display: flex;
    justify-content: center;
    margin-top: 20px;
}

#generateImageBtn {
    width: 100%;
    max-width: 400px;
    height: 56px;
    font-size: 18px;
    background: var(--primary-color);
    border: none;
    color: white;
    border-radius: 28px;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

#generateImageBtn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(37, 99, 235, 0.3);
}

#generateImageBtn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
}

.result-preview {
    min-height: 400px;
    background: var(--bg-secondary);
    border: 2px dashed var(--border-color);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    position: relative;
}

.result-preview img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.sub-tools {
    display: flex;
    gap: 8px;
}

.toolbar-title {
    font-weight: 600;
    margin-right: auto;
    color: var(--text-primary);
}

/* ========================================
   Tabs Navigation (New)
   ======================================== */
.tabs-nav {
    display: flex;
    overflow-x: auto;
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-primary);
    padding: 0 var(--spacing-lg);
    flex-shrink: 0;
}

.tab-btn {
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    background: none;
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.tab-btn:hover {
    color: var(--primary-color);
    background: var(--bg-tertiary);
}

.tab-btn.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

.tab-content-container {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-lg);
    position: relative;
    background: var(--bg-secondary);
}

.tab-panel {
    display: none;
    animation: fadeIn 0.3s ease;
}

.tab-panel.active {
    display: block;
}

/* Layout Adjustments */
.main-content {
    display: flex;
    flex-direction: column;
    height: 100vh;
    overflow: hidden;
}

.preview-area-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    padding: var(--spacing-lg);
    background: var(--bg-primary);
    border-top: 1px solid var(--border-color);
    height: 400px;
    /* Fixed height for preview area */
    flex-shrink: 0;
}

.preview-pane {
    display: flex;
    flex-direction: column;
    overflow: hidden;
    height: 100%;
}

.preview-pane h3 {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-secondary);
    display: flex;
    justify-content: space-between;
}

.preview-pane .textarea-input,
.preview-pane .result-preview {
    flex: 1;
    height: 100%;
}

/* JSON 预览折叠：默认只显示“显示”按钮条 */
.preview-area-row.json-hidden {
    grid-template-columns: 1fr;
}
.preview-area-row.json-hidden #jsonPreviewPane {
    display: none;
}
.preview-area-row.json-hidden #jsonPreviewToggleBtn {
    display: inline-flex;
}
.preview-area-row:not(.json-hidden) #jsonPreviewToggleBtn {
    display: none;
}

.sidebar .gen-controls {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

#generateImageBtn.sidebar-btn {
    width: 100%;
    margin-top: var(--spacing-md);
    font-size: 16px;
    padding: 12px;
}

/* ========================================
   Advanced Settings Styles
   ======================================== */
.advanced-section {
    background: var(--bg-primary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    margin-bottom: var(--spacing-lg);
    border: 1px solid var(--border-color);
}

.form-group-checkbox {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    cursor: pointer;
}

.form-group-checkbox input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

.form-group-checkbox label {
    margin-bottom: 0;
    font-weight: 600;
    cursor: pointer;
}

.checkbox-container {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    padding: 12px;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.checkbox-container label {
    display: flex;
    align-items: center;
    gap: 6px;
    cursor: pointer;
    font-size: 13px;
    padding: 4px 8px;
    border-radius: var(--radius-sm);
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    transition: all var(--transition-fast);
}

.checkbox-container label:hover {
    border-color: var(--primary-color);
}

.checkbox-container input[type="checkbox"] {
    cursor: pointer;
}

/* ========================================
   Preset Suggest Select (for textarea fields)
   ======================================== */
.preset-suggest-select {
    width: 100%;
    padding: 4px 8px;
    margin-top: 4px;
    font-size: 12px;
    color: var(--text-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--bg-secondary);
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg width='12' height='8' viewBox='0 0 12 8' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1L6 6L11 1' stroke='%23718096' stroke-width='2' stroke-linecap='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 8px center;
    padding-right: 24px;
}

.preset-suggest-select:hover {
    border-color: var(--primary-color);
}

.preset-suggest-select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px var(--primary-light);
}