scroll-to-github-top/themes.css at master · oiahoon/scroll-to-github-top · GitHub

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/* =============================================
   Smart TOC & Scroll — 主题系统 v2.8
   设计规范：UI_DESIGN_SPEC.md §7、§12
   ============================================= */

/* === 全局基础变量 === */
:root {
  /* 动画曲线 */
  --ease-expand:   cubic-bezier(0.34, 1.56, 0.64, 1);   /* 展开：带轻微弹出感 */
  --ease-collapse: cubic-bezier(0.40, 0.00, 0.60, 1);   /* 折叠：快速收缩，无弹出 */
  --ease-content:  cubic-bezier(0.00, 0.00, 0.20, 1);   /* 内容淡入，Material 标准 */
  --ease-standard: cubic-bezier(0.40, 0.00, 0.20, 1);   /* 标准曲线 */

  /* 兼容旧变量（toc.css 内部引用） */
  --ease-out: cubic-bezier(0.0, 0.0, 0.2, 1);
  --ease-in:  cubic-bezier(0.4, 0.0, 1, 1);

  /* 动画时长 */
  --duration-expand:   0.30s;
  --duration-collapse: 0.22s;
  --duration-fade:     0.20s;
  --duration-hover:    0.15s;

  /* 保留旧的 elevation 变量，供存量代码引用 */
  --elevation-1: 0 2px 1px -1px rgba(0,0,0,0.2), 0 1px 1px 0 rgba(0,0,0,0.14), 0 1px 3px 0 rgba(0,0,0,0.12);
  --elevation-2: 0 3px 3px -2px rgba(0,0,0,0.2), 0 3px 4px 0 rgba(0,0,0,0.14), 0 1px 8px 0 rgba(0,0,0,0.12);
  --elevation-3: 0 3px 5px -1px rgba(0,0,0,0.2), 0 6px 10px 0 rgba(0,0,0,0.14), 0 1px 18px 0 rgba(0,0,0,0.12);

  /* 导航预设：default / barcode */
  --toc-rail-line: rgba(255, 255, 255, 0.24);
  --toc-rail-line-hover: rgba(255, 255, 255, 0.48);
  --toc-rail-line-active: rgba(255, 255, 255, 0.92);
  --toc-rail-label: rgba(255, 255, 255, 0.58);
  --toc-rail-label-active: rgba(255, 255, 255, 0.98);
  --toc-rail-hover-surface: rgba(255, 255, 255, 0.04);
  --toc-rail-top-bg: rgba(255, 255, 255, 0.08);
  --toc-rail-top-bg-hover: rgba(255, 255, 255, 0.14);
  --toc-rail-top-border: rgba(255, 255, 255, 0.08);
  --toc-rail-preview-bg: rgba(17, 24, 39, 0.86);
  --toc-rail-preview-border: rgba(255, 255, 255, 0.18);
  --toc-rail-preview-shadow: 0 10px 24px rgba(0, 0, 0, 0.24);
}

/* =============================================
   主题 A：light（面向深色/中色背景页面）
   半透明磨砂白
   ============================================= */
.theme-light {
  /* 背景：半透明白色 + 磨砂模糊 */
  --toc-bg:               rgba(255, 255, 255, 0.88);
  --toc-bg-expanded:      rgba(255, 255, 255, 0.95);
  --toc-bg-fallback:      rgba(255, 255, 255, 0.98);  /* backdrop-filter 不支持时降级 */
  --toc-backdrop-filter:  blur(16px) saturate(180%);

  /* 文字 */
  --toc-text:             #1a1a1a;
  --toc-text-secondary:   rgba(26, 26, 26, 0.60);     /* 兼容旧引用 */
  --toc-text-muted:       rgba(26, 26, 26, 0.50);
  --toc-text-hover:       #000000;
  --toc-accent:           #0969da;                     /* 激活态强调色（GitHub 蓝） */
  --toc-text-active:      #0969da;                     /* 兼容旧引用 */

  /* 高亮 */
  --toc-highlight:        rgba(0, 0, 0, 0.05);
  --toc-highlight-active: rgba(9, 105, 218, 0.08);

  /* 描边 */
  --toc-border:           rgba(0, 0, 0, 0.10);
  --toc-border-hover:     rgba(0, 0, 0, 0.20);
  --toc-divider:          rgba(0, 0, 0, 0.07);

  /* 滚动条 */
  --toc-scrollbar-track:  transparent;                 /* 轨道透明 */
  --toc-scrollbar-thumb:  rgba(0, 0, 0, 0.18);

  /* 阴影 */
  --toc-elevation:          0 1px 3px rgba(0,0,0,0.10), 0 1px 2px rgba(0,0,0,0.06);
  --toc-elevation-rest:     0 1px 3px rgba(0,0,0,0.10), 0 1px 2px rgba(0,0,0,0.06);
  --toc-elevation-hover:    0 4px 12px rgba(0,0,0,0.12), 0 2px 4px rgba(0,0,0,0.08);
  --toc-elevation-press:    0 1px 2px rgba(0,0,0,0.08);
  --toc-elevation-expanded: 0 8px 32px rgba(0,0,0,0.14), 0 4px 8px rgba(0,0,0,0.08);
}

/* =============================================
   主题 B：dark（面向浅色背景页面）
   半透明磨砂深灰
   ============================================= */
.theme-dark {
  /* 背景：半透明深色 + 磨砂模糊 */
  --toc-bg:               rgba(30, 30, 30, 0.82);
  --toc-bg-expanded:      rgba(28, 28, 28, 0.94);
  --toc-bg-fallback:      rgba(28, 28, 28, 0.98);     /* backdrop-filter 不支持时降级 */
  --toc-backdrop-filter:  blur(16px) saturate(150%);

  /* 文字 */
  --toc-text:             rgba(255, 255, 255, 0.90);
  --toc-text-secondary:   rgba(255, 255, 255, 0.60);  /* 兼容旧引用 */
  --toc-text-muted:       rgba(255, 255, 255, 0.40);
  --toc-text-hover:       #ffffff;
  --toc-accent:           #58a6ff;                    /* 深色模式下的蓝色（GitHub 风格） */
  --toc-text-active:      #58a6ff;                    /* 兼容旧引用 */

  /* 高亮 */
  --toc-highlight:        rgba(255, 255, 255, 0.06);
  --toc-highlight-active: rgba(88, 166, 255, 0.12);

  /* 描边 */
  --toc-border:           rgba(255, 255, 255, 0.10);
  --toc-border-hover:     rgba(255, 255, 255, 0.20);
  --toc-divider:          rgba(255, 255, 255, 0.07);

  /* 滚动条 */
  --toc-scrollbar-track:  transparent;                /* 轨道透明 */
  --toc-scrollbar-thumb:  rgba(255, 255, 255, 0.18);

  /* 阴影 */
  --toc-elevation:          0 1px 4px rgba(0,0,0,0.35), 0 1px 2px rgba(0,0,0,0.20);
  --toc-elevation-rest:     0 1px 4px rgba(0,0,0,0.35), 0 1px 2px rgba(0,0,0,0.20);
  --toc-elevation-hover:    0 4px 12px rgba(0,0,0,0.45), 0 2px 4px rgba(0,0,0,0.25);
  --toc-elevation-press:    0 1px 2px rgba(0,0,0,0.25);
  --toc-elevation-expanded: 0 8px 32px rgba(0,0,0,0.55), 0 4px 8px rgba(0,0,0,0.30);
}

.theme-preset-default {
  --toc-rail-line: rgba(255, 255, 255, 0.24);
}

.theme-light.theme-preset-rail {
  --toc-bg: transparent;
  --toc-bg-expanded: transparent;
  --toc-backdrop-filter: none;
  --toc-border: transparent;
  --toc-border-hover: transparent;
  --toc-divider: transparent;
  --toc-elevation-rest: none;
  --toc-elevation-hover: none;
  --toc-elevation-expanded: none;
  --toc-highlight: transparent;
  --toc-highlight-active: transparent;
  --toc-rail-line: rgba(255, 255, 255, 0.22);
  --toc-rail-line-hover: rgba(255, 255, 255, 0.44);
  --toc-rail-line-active: rgba(255, 255, 255, 0.96);
  --toc-rail-label: rgba(255, 255, 255, 0.58);
  --toc-rail-label-active: rgba(255, 255, 255, 0.98);
  --toc-rail-hover-surface: rgba(255, 255, 255, 0.05);
  --toc-rail-top-bg: rgba(255, 255, 255, 0.06);
  --toc-rail-top-bg-hover: rgba(255, 255, 255, 0.14);
  --toc-rail-top-border: rgba(255, 255, 255, 0.10);
  --toc-rail-preview-bg: rgba(17, 24, 39, 0.86);
  --toc-rail-preview-border: rgba(255, 255, 255, 0.20);
  --toc-rail-preview-shadow: 0 10px 24px rgba(0, 0, 0, 0.28);
}

.theme-dark.theme-preset-rail {
  --toc-bg: transparent;
  --toc-bg-expanded: transparent;
  --toc-backdrop-filter: none;
  --toc-border: transparent;
  --toc-border-hover: transparent;
  --toc-divider: transparent;
  --toc-elevation-rest: none;
  --toc-elevation-hover: none;
  --toc-elevation-expanded: none;
  --toc-highlight: transparent;
  --toc-highlight-active: transparent;
  --toc-rail-line: rgba(15, 23, 42, 0.18);
  --toc-rail-line-hover: rgba(15, 23, 42, 0.36);
  --toc-rail-line-active: rgba(15, 23, 42, 0.78);
  --toc-rail-label: rgba(15, 23, 42, 0.58);
  --toc-rail-label-active: rgba(15, 23, 42, 0.92);
  --toc-rail-hover-surface: rgba(15, 23, 42, 0.05);
  --toc-rail-top-bg: rgba(15, 23, 42, 0.06);
  --toc-rail-top-bg-hover: rgba(15, 23, 42, 0.14);
  --toc-rail-top-border: rgba(15, 23, 42, 0.10);
  --toc-rail-preview-bg: rgba(255, 255, 255, 0.92);
  --toc-rail-preview-border: rgba(15, 23, 42, 0.14);
  --toc-rail-preview-shadow: 0 10px 24px rgba(15, 23, 42, 0.16);
}

/* =============================================
   主题 C：auto（媒体查询自动跟随操作系统偏好）
   浅色系统 → 深色浮层；深色系统 → 浅色浮层
   ============================================= */
.theme-auto {
  color-scheme: light dark;
}

@media (prefers-color-scheme: light) {
  /* 浅色系统 → 深色浮层（在浅色页面上更显眼） */
  .theme-auto {
    --toc-bg:               rgba(30, 30, 30, 0.82);
    --toc-bg-expanded:      rgba(28, 28, 28, 0.94);
    --toc-bg-fallback:      rgba(28, 28, 28, 0.98);
    --toc-backdrop-filter:  blur(16px) saturate(150%);
    --toc-text:             rgba(255, 255, 255, 0.90);
    --toc-text-secondary:   rgba(255, 255, 255, 0.60);
    --toc-text-muted:       rgba(255, 255, 255, 0.40);
    --toc-text-hover:       #ffffff;
    --toc-accent:           #58a6ff;
    --toc-text-active:      #58a6ff;
    --toc-highlight:        rgba(255, 255, 255, 0.06);
    --toc-highlight-active: rgba(88, 166, 255, 0.12);
    --toc-border:           rgba(255, 255, 255, 0.10);
    --toc-border-hover:     rgba(255, 255, 255, 0.20);
    --toc-divider:          rgba(255, 255, 255, 0.07);
    --toc-scrollbar-track:  transparent;
    --toc-scrollbar-thumb:  rgba(255, 255, 255, 0.18);
    --toc-elevation:          0 1px 4px rgba(0,0,0,0.35), 0 1px 2px rgba(0,0,0,0.20);
    --toc-elevation-rest:     0 1px 4px rgba(0,0,0,0.35), 0 1px 2px rgba(0,0,0,0.20);
    --toc-elevation-hover:    0 4px 12px rgba(0,0,0,0.45), 0 2px 4px rgba(0,0,0,0.25);
    --toc-elevation-press:    0 1px 2px rgba(0,0,0,0.25);
    --toc-elevation-expanded: 0 8px 32px rgba(0,0,0,0.55), 0 4px 8px rgba(0,0,0,0.30);
  }
}

@media (prefers-color-scheme: dark) {
  /* 深色系统 → 浅色浮层（在深色页面上更清晰） */
  .theme-auto {
    --toc-bg:               rgba(255, 255, 255, 0.88);
    --toc-bg-expanded:      rgba(255, 255, 255, 0.95);
    --toc-bg-fallback:      rgba(255, 255, 255, 0.98);
    --toc-backdrop-filter:  blur(16px) saturate(180%);
    --toc-text:             #1a1a1a;
    --toc-text-secondary:   rgba(26, 26, 26, 0.60);
    --toc-text-muted:       rgba(26, 26, 26, 0.50);
    --toc-text-hover:       #000000;
    --toc-accent:           #0969da;
    --toc-text-active:      #0969da;
    --toc-highlight:        rgba(0, 0, 0, 0.05);
    --toc-highlight-active: rgba(9, 105, 218, 0.08);
    --toc-border:           rgba(0, 0, 0, 0.10);
    --toc-border-hover:     rgba(0, 0, 0, 0.20);
    --toc-divider:          rgba(0, 0, 0, 0.07);
    --toc-scrollbar-track:  transparent;
    --toc-scrollbar-thumb:  rgba(0, 0, 0, 0.18);
    --toc-elevation:          0 1px 3px rgba(0,0,0,0.10), 0 1px 2px rgba(0,0,0,0.06);
    --toc-elevation-rest:     0 1px 3px rgba(0,0,0,0.10), 0 1px 2px rgba(0,0,0,0.06);
    --toc-elevation-hover:    0 4px 12px rgba(0,0,0,0.12), 0 2px 4px rgba(0,0,0,0.08);
    --toc-elevation-press:    0 1px 2px rgba(0,0,0,0.08);
    --toc-elevation-expanded: 0 8px 32px rgba(0,0,0,0.14), 0 4px 8px rgba(0,0,0,0.08);
  }
}

/* =============================================
   旧版彩色主题兼容映射
   theme-blue/green/purple → theme-dark 变量
   （保持 theme.js 逻辑不变，旧 class 不丢失功能）
   ============================================= */
.theme-blue,
.theme-green,
.theme-purple {
  --toc-bg:               rgba(30, 30, 30, 0.82);
  --toc-bg-expanded:      rgba(28, 28, 28, 0.94);
  --toc-bg-fallback:      rgba(28, 28, 28, 0.98);
  --toc-backdrop-filter:  blur(16px) saturate(150%);
  --toc-text:             rgba(255, 255, 255, 0.90);
  --toc-text-secondary:   rgba(255, 255, 255, 0.60);
  --toc-text-muted:       rgba(255, 255, 255, 0.40);
  --toc-text-hover:       #ffffff;
  --toc-accent:           #58a6ff;
  --toc-text-active:      #58a6ff;
  --toc-highlight:        rgba(255, 255, 255, 0.06);
  --toc-highlight-active: rgba(88, 166, 255, 0.12);
  --toc-border:           rgba(255, 255, 255, 0.10);
  --toc-border-hover:     rgba(255, 255, 255, 0.20);
  --toc-divider:          rgba(255, 255, 255, 0.07);
  --toc-scrollbar-track:  transparent;
  --toc-scrollbar-thumb:  rgba(255, 255, 255, 0.18);
  --toc-elevation:          0 1px 4px rgba(0,0,0,0.35), 0 1px 2px rgba(0,0,0,0.20);
  --toc-elevation-rest:     0 1px 4px rgba(0,0,0,0.35), 0 1px 2px rgba(0,0,0,0.20);
  --toc-elevation-hover:    0 4px 12px rgba(0,0,0,0.45), 0 2px 4px rgba(0,0,0,0.25);
  --toc-elevation-press:    0 1px 2px rgba(0,0,0,0.25);
  --toc-elevation-expanded: 0 8px 32px rgba(0,0,0,0.55), 0 4px 8px rgba(0,0,0,0.30);
}

/* =============================================
   backdrop-filter 降级处理
   磨砂效果由 toc.css 中的 .github-toc 应用，
   此处仅处理不支持时的降级背景
   ============================================= */
@supports not (backdrop-filter: blur(1px)) {
  .theme-light,
  .theme-dark,
  .theme-auto,
  .theme-blue,
  .theme-green,
  .theme-purple {
    /* 降级：提高不透明度以补偿缺少的磨砂效果 */
    --toc-bg: var(--toc-bg-fallback);
  }
}