src/index.css

/* ========================================================================
 * Vela — index.css
 * TailwindCSS v4 全面适配版本
 *
 * 层级顺序（由低到高）：
 *   @layer theme   — Tailwind 设计令牌
 *   @layer base    — 全局重置、CSS变量、滚动条
 *   @layer components — 自定义组件（panel-header, tree-item 等）
 *   @layer utilities  — Tailwind 工具类（px-3, flex, gap-2 等）
 *   无层样式        — CodeMirror 覆盖等需要最高优先级的样式
 *
 * 关键：所有自定义样式必须归入正确的 @layer，
 * 否则无层样式会覆盖 Tailwind 工具类，导致 px-3/py-1 等全部失效。
 * ======================================================================== */

/* ===== 本地内置字体（无需网络，所有字体文件均放置于 public/fonts/） ===== */

/* Sora — 现代几何无衬线，显示性强，独特但不过分 */
@font-face {
  font-family: 'Sora';
  src: url('/fonts/Sora-VariableFont_wght.ttf') format('truetype');
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}

/* Sora 斜体 */
@font-face {
  font-family: 'Sora';
  src: url('/fonts/Sora-VariableFont_wght.ttf') format('truetype');
  font-weight: 100 900;
  font-style: italic;
  font-display: swap;
}

/* ===== 本地内置中文写作字体（无需网络，放置于 public/fonts/） ===== */

/* 霞鹜文楷 Regular — 楷体，温润典雅，适合小说写作 */
@font-face {
  font-family: 'LXGW WenKai';
  src: url('/fonts/LXGWWenKai-Regular.ttf') format('truetype');
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

/* 霞鹜文楷 Medium — 较粗字重，阅读舒适感更强 */
@font-face {
  font-family: 'LXGW WenKai';
  src: url('/fonts/LXGWWenKai-Medium.ttf') format('truetype');
  font-weight: 500;
  font-style: normal;
  font-display: swap;
}

/* 思源宋体 — 可变字体，支持 100-900 所有字重，印刷感强 */
@font-face {
  font-family: 'Noto Serif SC';
  src: url('/fonts/NotoSerifSC-VariableFont_wght.ttf') format('truetype');
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}

/* 思源黑体 — 可变字体，支持 100-900 所有字重，现代简洁 */
@font-face {
  font-family: 'Noto Sans SC';
  src: url('/fonts/NotoSansSC-VariableFont_wght.ttf') format('truetype');
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}

/* ===== TailwindCSS v4 核心导入 ===== */
@import "tailwindcss";
@plugin "tailwindcss-animate";
@plugin "@tailwindcss/typography";

/* dark 变体：匹配 .dark 或 .galaxy 类的子元素 */
@custom-variant dark (&:is(.dark *, .galaxy *));

/* ===== Tailwind v4 设计令牌（精简版 — 仅保留 Tailwind 需要的扩展） ===== */
@theme {
  /* 字体栈 - 使用 Sora 替代 Inter，更具个性 */
  --font-sans: 'Sora', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', Consolas, monospace;
  --font-writing: 'Noto Serif SC', 'Source Han Serif SC', Georgia, serif;

  /* 文字尺寸 */
  --text-2xs: 0.625rem;
  --text-2xs--line-height: 0.875rem;

  /* 间距 */
  --spacing-sidebar: 260px;
  --spacing-panel-min: 200px;
  --spacing-titlebar: 36px;
  --spacing-statusbar: 24px;
  --spacing-activity-bar: 48px;

  /* Tailwind 动画 - 扩展更多交互动画 */
  --animate-fade-in: fade-in 0.15s ease-out;
  --animate-fade-in-up: fade-in-up 0.25s ease-out;
  --animate-fade-in-down: fade-in-down 0.25s ease-out;
  --animate-slide-in-right: slide-in-right 0.2s ease-out;
  --animate-slide-in-left: slide-in-left 0.2s ease-out;
  --animate-slide-in-up: slide-in-up 0.2s ease-out;
  --animate-scale-in: scale-in 0.2s ease-out;
  --animate-bounce-in: bounce-in 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  --animate-shimmer: shimmer 2s linear infinite;

  @keyframes fade-in {
    0% { opacity: 0; }
    100% { opacity: 1; }
  }

  @keyframes fade-in-up {
    0% { opacity: 0; transform: translateY(12px); }
    100% { opacity: 1; transform: translateY(0); }
  }

  @keyframes fade-in-down {
    0% { opacity: 0; transform: translateY(-12px); }
    100% { opacity: 1; transform: translateY(0); }
  }

  @keyframes slide-in-right {
    0% { transform: translateX(10px); opacity: 0; }
    100% { transform: translateX(0); opacity: 1; }
  }

  @keyframes slide-in-left {
    0% { transform: translateX(-10px); opacity: 0; }
    100% { transform: translateX(0); opacity: 1; }
  }

  @keyframes slide-in-up {
    0% { transform: translateY(10px); opacity: 0; }
    100% { transform: translateY(0); opacity: 1; }
  }

  @keyframes scale-in {
    0% { opacity: 0; transform: scale(0.92); }
    100% { opacity: 1; transform: scale(1); }
  }

  @keyframes bounce-in {
    0% { opacity: 0; transform: scale(0.3); }
    50% { transform: scale(1.05); }
    70% { transform: scale(0.95); }
    100% { opacity: 1; transform: scale(1); }
  }

  @keyframes shimmer {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
  }
}

/* =====================================================================
 * @layer base — 全局重置、CSS变量、基础元素样式
 * 优先级低于 utilities，保证 Tailwind 工具类能正常覆盖
 * ===================================================================== */
@layer base {

  /* ===== CSS 变量 — 从 Logo 提取品牌色系 ===== */
  /* Logo 核心色：深邃蓝 #0A1628 · 冰蓝 #7EC8E3 · 星空蓝 #5B9ED6
     薰衣草紫 #9B8EC8 · 星辰金 #C9A76C */
  :root {
    /* ☀️ 浅色主题 — 清冷蓝调（从 Logo 蓝紫色系延伸） */

    /* 背景层次（冷白蓝调，与Logo深蓝形成呼应） */
    --color-bg: #F7F9FC;
    --color-sidebar: #EFF2F7;
    --color-panel: #EFF2F7;
    --color-titlebar: #F7F9FC;
    --color-activity-bar: #E5E9F0;
    --color-hover: #EBF0F7;
    --color-active: #DDE3ED;

    /* 文字层次 */
    --color-text: #1A2233;
    --color-text-secondary: #4A5568;
    --color-text-muted: #8A9AAB;

    /* 边框 */
    --color-border: #DEE3ED;

    /* 强调色（Logo 星空蓝） */
    --color-accent: #5B9ED6;
    --color-accent-hover: #4A8DC5;
    --color-accent-rgb: 91, 158, 214;

    /* 品牌金色（Logo 星辰点睛） */
    --color-gold: #C9A76C;

    /* 语义色（莫兰迪低饱和度高通透感） */
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-error: #f43f5e;
    --color-info: #5B9ED6;

    /* Tab 系统 */
    --color-tab-bg: transparent;
    --color-tab-active: #FFFFFF;
    --color-tab-border: transparent;
    --color-tab-indicator: #5B9ED6;

    /* 状态栏 */
    --color-statusbar: #EFF2F7;
    --color-statusbar-text: #8994A7;

    /* 标题栏文字 */
    --color-titlebar-text: #2D3748;

    /* 活动栏图标颜色 */
    --color-activity-icon: #8994A7;
    --color-activity-icon-active: #1A2233;
    --color-activity-indicator: #5B9ED6;

    /* 编辑器 */
    --color-editor-bg: #F7F9FC;
    --color-editor-line-highlight: rgba(91, 158, 214, 0.04);
    --color-editor-selection: rgba(91, 158, 214, 0.14);

    /* 分割条 Sash */
    --color-sash: transparent;
    --color-sash-hover: rgba(91, 158, 214, 0.15);

    /* ===== 语义令牌 ===== */

    /* 焦点环 */
    --color-focus-ring: rgba(91, 158, 214, 0.45);
    /* 遮罩层 */
    --color-backdrop: rgba(10, 22, 40, 0.20);
    /* Tooltip */
    --color-tooltip-bg: #0F1A2E;
    --color-tooltip-text: #E8ECF2;
    /* 骨架屏 */
    --color-skeleton: rgba(91, 158, 214, 0.08);
    /* Badge */
    --color-badge-bg: rgba(91, 158, 214, 0.10);
    --color-badge-text: #5B9ED6;

    /* ===== 尺寸规范 ===== */
    --height-titlebar: 40px;
    --height-statusbar: 28px;
    --height-tab: 36px;
    --height-panel-header: 36px;
    --width-left-bar: 44px;
    --width-right-bar: 44px;
    --width-bottom-bar: 32px;

    /* 圆角（加大圆角，更现代） */
    --radius-sm: 4px;
    --radius-md: 6px;
    --radius-lg: 10px;
    --radius-xl: 14px;
    --radius-2xl: 20px;

    /* 阴影（蓝调弥散阴影） */
    --shadow-sm: 0 1px 2px rgba(10, 22, 40, 0.05);
    --shadow-md: 0 4px 12px rgba(10, 22, 40, 0.07);
    --shadow-lg: 0 12px 32px rgba(10, 22, 40, 0.09);
    --shadow-popover: 0 16px 40px -8px rgba(10, 22, 40, 0.14), 0 4px 16px -4px rgba(10, 22, 40, 0.07);
    --shadow-tooltip: 0 4px 12px rgba(10, 22, 40, 0.18);

    /* 过渡（加入顺滑阻尼） */
    --transition-fast: 0.12s cubic-bezier(0.16, 1, 0.3, 1);
    --transition-normal: 0.25s cubic-bezier(0.16, 1, 0.3, 1);
    --transition-spring: 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);

    /* 字体 */
    --font-sans: 'Sora', system-ui, -apple-system, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    --font-writing: 'LXGW WenKai', 'Noto Serif SC', serif;
  }

  /* 🌑 星空主题 — Logo 深邃星空（直接取自 Logo 背景色 #0A1628） */
  .galaxy {
    /* 背景层次 — Logo 深蓝背景色为基底，逐层提亮 */
    --color-bg: #0A1628;
    --color-sidebar: #0E1B30;
    --color-panel: #0E1B30;
    --color-titlebar: #0A1628;
    --color-activity-bar: #071220;
    --color-hover: #142640;
    --color-active: #1C3050;

    /* 文字层次 — 冰蓝色阶梯，与Logo蓝色调和谐 */
    --color-text: #E0ECF4;
    --color-text-secondary: #8BA4BE;
    --color-text-muted: #5A7A96;

    /* 边框 — 深蓝色边框，微弱可见 */
    --color-border: #172B42;

    /* 强调色 — Logo 冰蓝 #7EC8E3 */
    --color-accent: #7EC8E3;
    --color-accent-hover: #6AB8D8;
    --color-accent-rgb: 126, 200, 227;

    /* 品牌金色 — Logo 星辰金 #C9A76C */
    --color-gold: #C9A76C;

    --color-success: #4ade80;
    --color-warning: #fbbf24;
    --color-error: #fb7185;
    --color-info: #7EC8E3;

    --color-tab-bg: transparent;
    --color-tab-active: #0E1E35;
    --color-tab-border: transparent;
    --color-tab-indicator: #7EC8E3;

    --color-statusbar: #071220;
    --color-statusbar-text: #4A6580;

    --color-titlebar-text: #8BA4BE;

    --color-activity-icon: #4A6580;
    --color-activity-icon-active: #E0ECF4;
    --color-activity-indicator: #7EC8E3;

    --color-editor-bg: #091525;
    --color-editor-line-highlight: rgba(126, 200, 227, 0.04);
    --color-editor-selection: rgba(126, 200, 227, 0.18);

    --color-sash: transparent;
    --color-sash-hover: rgba(126, 200, 227, 0.15);

    /* 语义令牌 */
    --color-focus-ring: rgba(126, 200, 227, 0.50);
    --color-backdrop: rgba(5, 10, 20, 0.65);
    --color-tooltip-bg: #E0ECF4;
    --color-tooltip-text: #0E1B30;
    --color-skeleton: rgba(126, 200, 227, 0.06);
    --color-badge-bg: rgba(126, 200, 227, 0.12);
    --color-badge-text: #7EC8E3;

    /* 阴影 — 深蓝光晕 */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.5);
    --shadow-md: 0 4px 12px rgba(5, 10, 20, 0.6);
    --shadow-lg: 0 12px 32px rgba(5, 10, 20, 0.7);
    --shadow-popover: 0 0 0 1px rgba(126, 200, 227, 0.06), 0 16px 40px -8px rgba(5, 10, 20, 0.85), 0 4px 16px -4px rgba(5, 10, 20, 0.7);
    --shadow-tooltip: 0 4px 12px rgba(5, 10, 20, 0.5);
  }

  /* 📜 纸质感主题 — 写作沉浸（温暖牛皮纸色调 + Logo 紫色强调） */
  .paper {
    --color-bg: #F5F0E8;
    --color-sidebar: #EDE8E0;
    --color-panel: #EDE8E0;
    --color-titlebar: #F5F0E8;
    --color-activity-bar: #E4DDD4;
    --color-hover: #E8E3DB;
    --color-active: #DCD5CB;

    --color-text: #2C2520;
    --color-text-secondary: #6B6058;
    --color-text-muted: #A89888;

    --color-border: #DDD8D0;

    /* 强调色 — Logo 薰衣草紫 #9B8EC8 */
    --color-accent: #9B8EC8;
    --color-accent-hover: #8B7EB8;
    --color-accent-rgb: 155, 142, 200;

    --color-gold: #C9A76C;

    --color-success: #4d9e72;
    --color-warning: #c8923a;
    --color-error: #c45b5b;
    --color-info: #7B92C0;

    --color-tab-bg: transparent;
    --color-tab-active: #FAF5ED;
    --color-tab-border: transparent;
    --color-tab-indicator: #9B8EC8;

    --color-statusbar: #EDE8E0;
    --color-statusbar-text: #A09488;

    --color-titlebar-text: #4A4038;

    --color-activity-icon: #A09488;
    --color-activity-icon-active: #2C2520;
    --color-activity-indicator: #9B8EC8;

    --color-editor-bg: #F8F3EB;
    --color-editor-line-highlight: rgba(155, 142, 200, 0.04);
    --color-editor-selection: rgba(155, 142, 200, 0.12);

    --color-sash: transparent;
    --color-sash-hover: rgba(155, 142, 200, 0.12);

    /* 语义令牌 */
    --color-focus-ring: rgba(155, 142, 200, 0.45);
    --color-backdrop: rgba(44, 37, 32, 0.25);
    --color-tooltip-bg: #2C2520;
    --color-tooltip-text: #F5F0E8;
    --color-skeleton: rgba(0, 0, 0, 0.05);
    --color-badge-bg: rgba(155, 142, 200, 0.10);
    --color-badge-text: #9B8EC8;

    /* 阴影 */
    --shadow-sm: 0 1px 2px rgba(44, 37, 32, 0.06);
    --shadow-md: 0 4px 12px rgba(44, 37, 32, 0.08);
    --shadow-lg: 0 12px 32px rgba(44, 37, 32, 0.10);
    --shadow-popover: 0 16px 40px -8px rgba(44, 37, 32, 0.14), 0 4px 16px -4px rgba(44, 37, 32, 0.08);
    --shadow-tooltip: 0 4px 12px rgba(44, 37, 32, 0.18);
  }

  /* 🌃 黑夜主题 — VS Code / IDEA 深灰极客风（真正的暗黑模式） */
  .dark {
    --color-bg: #1E1E1E;
    --color-sidebar: #252526;
    --color-panel: #252526;
    --color-titlebar: #181818;
    --color-activity-bar: #333333;
    --color-hover: #2A2D2E;
    --color-active: #37373D;

    --color-text: #D4D4D4;
    --color-text-secondary: #A0A0A0;
    --color-text-muted: #888888;

    --color-border: #3C3C3C;

    --color-accent: #0E639C;
    --color-accent-hover: #1177BB;
    --color-accent-rgb: 14, 99, 156;

    --color-gold: #C9A76C;

    --color-success: #89D185;
    --color-warning: #CCA700;
    --color-error: #F14C4C;
    --color-info: #3794FF;

    --color-tab-bg: transparent;
    --color-tab-active: #1E1E1E;
    --color-tab-border: transparent;
    --color-tab-indicator: #0E639C;

    --color-statusbar: #181818;
    --color-statusbar-text: #909090;

    --color-titlebar-text: #CCCCCC;

    --color-activity-icon: #858585;
    --color-activity-icon-active: #FFFFFF;
    --color-activity-indicator: #FFFFFF;

    --color-editor-bg: #1E1E1E;
    --color-editor-line-highlight: rgba(255, 255, 255, 0.04);
    --color-editor-selection: rgba(38, 79, 120, 0.6);

    --color-sash: transparent;
    --color-sash-hover: rgba(0, 122, 204, 0.5);

    --color-focus-ring: rgba(0, 122, 204, 0.4);
    --color-backdrop: rgba(0, 0, 0, 0.4);
    --color-tooltip-bg: #252526;
    --color-tooltip-text: #CCCCCC;
    --color-skeleton: rgba(255, 255, 255, 0.05);
    --color-badge-bg: #4D4D4D;
    --color-badge-text: #FFFFFF;

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.6);
    --shadow-popover: 0 16px 40px -8px rgba(0, 0, 0, 0.7), 0 4px 16px -4px rgba(0, 0, 0, 0.5);
    --shadow-tooltip: 0 4px 12px rgba(0, 0, 0, 0.5);
  }

  /* ===== 全局基础样式 ===== */
  *,
  *::before,
  *::after {
    box-sizing: border-box;
  }

  html {
    font-size: 14px;
    scroll-behavior: smooth;
  }

  html,
  body,
  #root {
    width: 100%;
    height: 100%;
    overflow: hidden;
    font-family: var(--font-sans);
    font-size: inherit;
    line-height: 1.5;
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    /* 增强的过渡曲线 */
    transition-timing-function: cubic-bezier(0.16, 1, 0.3, 1);
  }

  /* 禁止文本选择（IDE 区域） */
  .no-select {
    user-select: none;
    -webkit-user-select: none;
  }

  /* 允许文本选择（编辑区域） */
  .allow-select {
    user-select: text;
    -webkit-user-select: text;
  }

  /* ===== 滚动条样式（细腻 6px） ===== */
  ::-webkit-scrollbar {
    width: 6px;
    height: 6px;
  }

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

  ::-webkit-scrollbar-thumb {
    background: rgba(128, 128, 128, 0.25);
    border-radius: 3px;
  }

  ::-webkit-scrollbar-thumb:hover {
    background: rgba(128, 128, 128, 0.45);
  }

  .galaxy ::-webkit-scrollbar-thumb {
    background: rgba(126, 200, 227, 0.12);
  }

  .galaxy ::-webkit-scrollbar-thumb:hover {
    background: rgba(126, 200, 227, 0.25);
  }

  .dark ::-webkit-scrollbar-thumb {
    background: rgba(128, 128, 128, 0.20);
  }

  .dark ::-webkit-scrollbar-thumb:hover {
    background: rgba(128, 128, 128, 0.40);
  }

  .paper ::-webkit-scrollbar-thumb {
    background: rgba(120, 100, 80, 0.20);
  }

  .paper ::-webkit-scrollbar-thumb:hover {
    background: rgba(120, 100, 80, 0.35);
  }
}

/* =====================================================================
 * @layer components — 自定义 IDE 组件样式
 * 优先级高于 base，低于 utilities（Tailwind 工具类可覆盖）
 * ===================================================================== */
@layer components {

  /* ===== 分隔条（拖拽调整大小）— 白色微光风格 ===== */
  .sash {
    position: absolute;
    z-index: 10;
    background: var(--color-sash);
    transition: background var(--transition-fast);
  }

  .sash:hover,
  .sash.active {
    background: var(--color-sash-hover);
  }

  .sash-vertical {
    width: 4px;
    cursor: col-resize;
    top: 0;
    bottom: 0;
  }

  .sash-horizontal {
    height: 4px;
    cursor: row-resize;
    left: 0;
    right: 0;
  }

  /* ===== 面板标题栏 — JetBrains 风格：紧凑、全大写、弱化 ===== */
  .panel-header {
    @apply flex items-center px-3 gap-2;
    height: var(--height-panel-header);
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--color-text-muted);
    border-bottom: 1px solid var(--color-border);
    background: transparent;
    user-select: none;
    flex-shrink: 0;
  }

  /* ===== 树节点 — 舒适的 26px 行高，带增强悬停效果 ===== */
  .tree-item {
    @apply flex items-center gap-1.5 px-2 cursor-pointer;
    height: 26px;
    font-size: 13px;
    color: var(--color-text);
    transition: background var(--transition-fast),
                box-shadow var(--transition-fast),
                transform 0.12s ease;
    position: relative;
    border-radius: var(--radius-sm);
    margin: 0 4px;
  }

  .tree-item:hover {
    background: var(--color-hover);
    transform: translateX(2px);
  }

  /* 激活节点：背景 + 左侧 2px 品牌色竖线 */
  .tree-item.active {
    background: var(--color-active);
    box-shadow: inset 2px 0 0 var(--color-accent);
  }

  /* ===== 旧按钮类已废弃 — 请使用 <Button> 组件 (src/components/ui/Button.tsx) ===== */
  /* .btn-primary 和 .btn-ghost 已迁移至 Button.tsx 的 cva 变体系统 */

  /* ===== 图标按钮 — 22px 尺寸，带增强悬停效果 ===== */
  .icon-btn {
    @apply flex items-center justify-center;
    width: 22px;
    height: 22px;
    border-radius: var(--radius-sm);
    color: var(--color-text-secondary);
    transition: all var(--transition-fast),
                transform 0.15s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  }

  .icon-btn:hover {
    background: var(--color-hover);
    color: var(--color-text);
    transform: scale(1.1);
  }

  .icon-btn:active {
    transform: scale(0.95);
  }

  /* ===== 配置编辑器输入框 ===== */
  .config-input {
    @apply w-full px-2.5 py-1.5 text-xs outline-none;
    border-radius: var(--radius-md);
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    color: var(--color-text);
    transition: border-color var(--transition-fast);
  }

  .config-input:focus {
    border-color: var(--color-accent);
  }

  .config-input::placeholder {
    color: var(--color-text-muted);
  }

  /* ===== 工具窗口按钮 — 三条工具栏共用，带增强悬停效果 ===== */
  .tool-btn {
    @apply flex items-center justify-center relative;
    width: 100%;
    height: 30px;
    color: var(--color-activity-icon);
    transition: color var(--transition-fast),
                background var(--transition-fast),
                transform 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275),
                box-shadow 0.2s ease;
    cursor: pointer;
    border: none;
    background: transparent;
    outline: none;
    border-radius: var(--radius-sm);
  }

  .tool-btn:hover {
    background: rgba(var(--color-accent-rgb), 0.08);
    color: var(--color-text);
    transform: scale(1.08);
  }

  .tool-btn.active {
    color: var(--color-activity-icon-active);
    background: rgba(var(--color-accent-rgb), 0.12);
    box-shadow: inset 0 -2px 0 var(--color-accent);
  }

  /* ===== 底部工具栏按钮（更矮） ===== */
  .bottom-tool-btn {
    @apply flex items-center justify-center relative w-full;
    height: 26px;
    color: var(--color-activity-icon);
    transition: color var(--transition-fast), background var(--transition-fast);
    cursor: pointer;
    border: none;
    background: transparent;
    outline: none;
  }

  .bottom-tool-btn:hover {
    background: rgba(128, 128, 128, 0.10);
    color: var(--color-text);
  }

  .bottom-tool-btn.active {
    color: var(--color-accent);
    box-shadow: inset -2px 0 0 var(--color-accent);
  }

  /* ===== Agent 面板专用样式 ===== */
  .assistant-content {
    line-height: 1.6;
  }

  .agent-textarea::placeholder {
    color: var(--color-text-muted);
    opacity: 0.6;
  }

  /* ===== AI 任务胶囊指示器（StatusBar）===== */
  .ai-task-capsule {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 0 8px;
    height: 100%;
    border: none;
    border-radius: 0;
    background: transparent;
    font-size: 0.68rem;
    font-family: var(--font-sans);
    color: var(--color-statusbar-text);
    cursor: pointer;
    transition: background var(--transition-fast);
    animation: capsule-enter 0.3s ease-out;
    white-space: nowrap;
    max-width: 260px;
  }

  .ai-task-capsule:hover {
    background: rgba(var(--color-accent-rgb), 0.08);
  }

  .ai-task-capsule--complete {
    color: var(--color-success);
    animation: capsule-complete 1.8s ease-out forwards;
  }

  /* ===== AI 输出面板 — 流式打字机光标 ===== */
  .ai-stream-cursor {
    display: inline-block;
    width: 5px;
    height: 14px;
    margin-left: 2px;
    vertical-align: middle;
    background-color: var(--color-accent);
    border-radius: 1px;
    animation: agent-cursor-blink 1s steps(1) infinite;
  }

  /* ===== 品牌渐变文字 — 统一所有品牌标识使用（Logo 冰蓝→薰衣草紫） ===== */
  .brand-gradient {
    background: linear-gradient(135deg, #7EC8E3, #9B8EC8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
  }

  /* ===== Default 主按钮 — 品牌冰蓝渐变 + 玻璃高光 + 增强动效 ===== */
  .btn-primary {
    background: linear-gradient(180deg, var(--color-accent), var(--color-accent-hover));
    border: 1px solid rgba(255, 255, 255, 0.15);
    box-shadow:
      inset 0 1px 0 rgba(255, 255, 255, 0.2),
      0 2px 4px rgba(0, 0, 0, 0.15),
      0 0 0 0 rgba(var(--color-accent-rgb), 0);
    transition: box-shadow var(--transition-normal),
                transform 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275),
                filter 0.15s ease;
  }

  .btn-primary:hover {
    filter: brightness(1.12);
    box-shadow:
      inset 0 1px 0 rgba(255, 255, 255, 0.25),
      0 6px 20px rgba(var(--color-accent-rgb), 0.35),
      0 0 30px rgba(var(--color-accent-rgb), 0.15);
    transform: translateY(-2px);
  }

  .btn-primary:active {
    transform: translateY(0);
    filter: brightness(0.95);
    box-shadow:
      inset 0 1px 0 rgba(255, 255, 255, 0.1),
      0 1px 2px rgba(0, 0, 0, 0.1);
  }

  /* ===== AI 极光光效按钮 — 所有 AI 功能按钮统一使用（Logo 冰蓝→薰衣草紫） ===== */
  .ai-glow {
    position: relative;
    background: linear-gradient(135deg, #7EC8E3, #9B8EC8);
    color: #fff;
    border: none;
    transition: box-shadow var(--transition-normal),
                transform 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  }

  .ai-glow::before {
    content: '';
    position: absolute;
    inset: -3px;
    border-radius: inherit;
    background: linear-gradient(135deg, rgba(126, 200, 227, 0.5), rgba(155, 142, 200, 0.5), rgba(201, 167, 108, 0.3));
    filter: blur(8px);
    opacity: 0;
    transition: opacity var(--transition-normal);
    z-index: -1;
  }

  .ai-glow:hover {
    box-shadow: 0 6px 24px rgba(126, 200, 227, 0.35), 0 0 32px rgba(155, 142, 200, 0.25);
    transform: translateY(-2px);
  }

  .ai-glow:hover::before {
    opacity: 1;
  }

  .ai-glow:active {
    transform: translateY(0);
  }
}

/* ===== 全局 @keyframes（不受层级影响） ===== */

/* 增强的光标闪烁动画 */
@keyframes agent-cursor-blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

/* 脉冲动画 - 更流畅的缩放 */
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.7; transform: scale(0.9); }
}

/* 胶囔入场动画 */
@keyframes capsule-enter {
  0% { opacity: 0; transform: translateY(-4px); }
  100% { opacity: 1; transform: translateY(0); }
}

/* 胶囊完成动画 - 优雅淡出 */
@keyframes capsule-complete {
  0% { opacity: 1; }
  50% { opacity: 1; transform: scale(1.02); }
  100% { opacity: 0; transform: scale(0.98); }
}

/* ===== 统一通知 / 对话框动画 ===== */

/* Toast 进场 - 弹跳效果 */
@keyframes toast-enter {
  0% { opacity: 0; transform: translateY(20px) scale(0.9); }
  60% { transform: translateY(-4px) scale(1.02); }
  100% { opacity: 1; transform: translateY(0) scale(1); }
}

/* Toast 退场 - 下滑消失 */
@keyframes toast-exit {
  0% { opacity: 1; transform: translateY(0) scale(1); }
  100% { opacity: 0; transform: translateY(16px) scale(0.95); }
}

/* Dialog / Confirm / AlertDialog 进场 - 缩放+上移 */
@keyframes dialog-enter {
  0% { opacity: 0; transform: translateY(16px) scale(0.95); }
  100% { opacity: 1; transform: translateY(0) scale(1); }
}

/* Dialog / Confirm / AlertDialog 退场 */
@keyframes dialog-exit {
  0% { opacity: 1; transform: translateY(0) scale(1); }
  100% { opacity: 0; transform: translateY(12px) scale(0.98); }
}

/* 遮罩层渐入 - 模糊过渡 */
@keyframes backdrop-enter {
  0% { opacity: 0; backdrop-filter: blur(0px); }
  100% { opacity: 1; backdrop-filter: blur(8px); }
}

/* 遮罩层渐出 */
@keyframes backdrop-exit {
  0% { opacity: 1; backdrop-filter: blur(8px); }
  100% { opacity: 0; backdrop-filter: blur(0px); }
}

/* 骨架屏呼吸动画 */
@keyframes skeleton-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

/* ActionToast 从右侧滑入 */
@keyframes action-toast-enter {
  0% { opacity: 0; transform: translateX(24px) scale(0.96); }
  100% { opacity: 1; transform: translateX(0) scale(1); }
}

@keyframes action-toast-exit {
  0% { opacity: 1; transform: translateX(0) scale(1); }
  100% { opacity: 0; transform: translateX(24px) scale(0.96); }
}

/* ===== 新增强动画 ===== */

/* 弹跳进入 - 用于成功状态 */
@keyframes bounce-in {
  0% { opacity: 0; transform: scale(0.3); }
  50% { transform: scale(1.08); }
  70% { transform: scale(0.96); }
  100% { opacity: 1; transform: scale(1); }
}

/* 闪烁效果 - 用于加载状态 */
@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

/* 旋转进入 */
@keyframes spin-in {
  0% { opacity: 0; transform: rotate(-10deg) scale(0.95); }
  100% { opacity: 1; transform: rotate(0) scale(1); }
}

/* 渐显下滑 */
@keyframes fade-in-down {
  0% { opacity: 0; transform: translateY(-10px); }
  100% { opacity: 1; transform: translateY(0); }
}

/* =====================================================================
 * 无层样式 — CodeMirror 搜索面板覆盖（需要最高优先级）
 * 这些样式故意不放入任何 @layer，使其优先级高于所有层级样式
 * ===================================================================== */

/* CodeMirror 搜索面板 IDEA 风格 — 扁平化嵌入式设计 */
/* top: true 时面板在 cm-panels-top，否则在 cm-panels-bottom，统一覆盖 */
.cm-editor .cm-panels-top:has(.cm-search),
.cm-editor .cm-panels-bottom:has(.cm-search) {
  position: static !important;
  height: auto !important;
  border: none !important;
  border-bottom: 1px solid var(--color-border) !important;
  border-top: none !important;
  background-color: var(--color-sidebar) !important;
  padding: 0 !important;
  margin: 0 !important;
  order: -1 !important;
}

/* panels 容器默认有上边框，强制移除 */
.cm-editor .cm-panels {
  border-color: var(--color-border) !important;
}

.cm-panel.cm-search {
  position: relative !important;
  display: flex !important;
  flex-wrap: wrap !important;
  align-items: center;
  padding: 6px 12px 2px 12px !important;
  background-color: var(--color-sidebar) !important;
  border: none !important;
  border-radius: 0 !important;
  box-shadow: none !important;
  font-family: var(--font-sans);
  font-size: 13px;
  color: var(--color-text);
  width: 100%;
  max-width: none !important;
}

/* br 元素作为 flex 换行符，让查找行和替换行分两行显示 */
.cm-search br {
  display: block !important;
  content: "" !important;
  width: 0 !important;
  flex-basis: 100% !important;
  height: 2px !important;
  margin: 0 !important;
  padding: 0 !important;
  overflow: hidden !important;
}

.dark .cm-search {
  background-color: var(--color-sidebar) !important;
  box-shadow: none !important;
}

.cm-search input.cm-textfield {
  background: var(--color-bg) !important;
  border: 1px solid var(--color-border) !important;
  color: var(--color-text) !important;
  border-radius: var(--radius-sm);
  padding: 2px 6px;
  font-size: 12px;
  outline: none;
  min-width: 130px;
  max-width: 180px;
  margin-right: 6px;
  margin-bottom: 4px;
  vertical-align: middle;
  height: 24px;
}

.cm-search input.cm-textfield:focus {
  border-color: var(--color-accent) !important;
}

.cm-search button {
  background: transparent !important;
  border: 1px solid transparent !important;
  color: var(--color-text-secondary) !important;
  cursor: pointer;
  padding: 2px 6px !important;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-transform: capitalize;
  margin-right: 6px;
  margin-bottom: 4px;
  vertical-align: middle;
  height: 24px;
}

.cm-search button:hover {
  background: var(--color-hover) !important;
  color: var(--color-text) !important;
  border-color: var(--color-border) !important;
}

.cm-search label {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  color: var(--color-text-secondary);
  font-size: 12px;
  margin-right: 10px;
  margin-bottom: 4px;
  cursor: pointer;
  vertical-align: middle;
}

.cm-search label:last-of-type {
  margin-right: 36px !important;
}

.cm-search input[type="checkbox"] {
  cursor: pointer;
  accent-color: var(--color-accent);
  margin: 0;
}

.cm-search button[name="close"] {
  position: absolute !important;
  top: 6px !important;
  right: 16px !important;
  margin: 0 !important;
  padding: 0 !important;
  background: transparent !important;
  border: none !important;
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  color: var(--color-text-secondary) !important;
  transition: background-color var(--transition-fast), color var(--transition-fast) !important;
}

.cm-search button[name="close"]:hover {
  background: var(--color-hover) !important;
  color: var(--color-text) !important;
}

/* 搜索结果高亮 IDEA 风格 */
.cm-searchMatch {
  background-color: rgba(var(--color-accent-rgb), 0.3) !important;
  border-radius: 2px;
}

.dark .cm-searchMatch {
  background-color: rgba(var(--color-accent-rgb), 0.4) !important;
}

.cm-searchMatch-selected {
  background-color: var(--color-accent) !important;
  color: white !important;
}

/* ===== View Transition API: 主题切换动画 ===== */
/* JS 端始终对 ::view-transition-new(root) 执行 clip-path 圆形展开，
   因此 new 层必须在 old 层上方，所有主题统一 z-index 即可。 */
::view-transition-old(root),
::view-transition-new(root) {
  animation: none;
  mix-blend-mode: normal;
}

::view-transition-old(root) {
  z-index: 1;
}

::view-transition-new(root) {
  z-index: 2;
}

/* ===== 增强动画工具类 ===== */

/* 渐入动画 */
.animate-fade-in {
  animation: fade-in 0.2s ease-out forwards;
}

/* 渐入上移动画 */
.animate-fade-in-up {
  animation: fade-in-up 0.25s ease-out forwards;
}

/* 缩放入场动画 */
.animate-scale-in {
  animation: scale-in 0.2s ease-out forwards;
}

/* 弹跳入场动画 */
.animate-bounce-in {
  animation: bounce-in 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
}

/* 交错渐入 - 用于列表项依次入场 */
.stagger-enter > *:nth-child(1) { animation-delay: 0ms; }
.stagger-enter > *:nth-child(2) { animation-delay: 50ms; }
.stagger-enter > *:nth-child(3) { animation-delay: 100ms; }
.stagger-enter > *:nth-child(4) { animation-delay: 150ms; }
.stagger-enter > *:nth-child(5) { animation-delay: 200ms; }
.stagger-enter > *:nth-child(6) { animation-delay: 250ms; }
.stagger-enter > *:nth-child(7) { animation-delay: 300ms; }
.stagger-enter > *:nth-child(8) { animation-delay: 350ms; }
.stagger-enter > *:nth-child(9) { animation-delay: 400ms; }
.stagger-enter > *:nth-child(10) { animation-delay: 450ms; }

/* 悬停上浮效果 */
.hover-lift {
  transition: transform 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275), box-shadow 0.2s ease;
}
.hover-lift:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* 悬停缩放效果 */
.hover-scale {
  transition: transform 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}
.hover-scale:hover {
  transform: scale(1.02);
}

/* 按下缩放效果 */
.active-press:active {
  transform: scale(0.98);
}

/* 发光边框效果 */
.glow-border {
  position: relative;
}
.glow-border::before {
  content: '';
  position: absolute;
  inset: -1px;
  border-radius: inherit;
  background: linear-gradient(135deg, var(--color-accent), var(--color-gold));
  opacity: 0;
  transition: opacity 0.3s ease;
  z-index: -1;
}
.glow-border:hover::before {
  opacity: 0.5;
}

/* 玻璃态效果 */
.glass {
  background: rgba(var(--color-bg), 0.8);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(var(--color-border), 0.5);
}

/* 渐变文字效果 */
.text-gradient {
  background: linear-gradient(135deg, var(--color-accent), var(--color-gold));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* 平滑滚动 */
.smooth-scroll {
  scroll-behavior: smooth;
}

/* 焦点环增强 */
.focus-ring:focus-visible {
  outline: none;
  box-shadow: 0 0 0 2px var(--color-bg), 0 0 0 4px var(--color-focus-ring);
}

/* 禁用选择时的指针事件 */
.no-pointer {
  pointer-events: none;
}

/* 加载状态闪烁 */
.shimmer {
  background: linear-gradient(
    90deg,
    var(--color-skeleton) 25%,
    rgba(var(--color-accent-rgb), 0.12) 50%,
    var(--color-skeleton) 75%
  );
  background-size: 200% 100%;
  animation: shimmer 1.5s ease-in-out infinite;
}