82a942a2b1
- CHANGELOG: v0.34 Sprint 26 entry (6 themes, /theme command, settings UX) - README: themes section, updated slash commands, THEMES.md in docs list - THEMES.md: added Slate to theme table, matches actual CSS/dropdown - commands.js: added 'light' to /theme valid list, updated description - index.html: added Light option to theme dropdown, version v0.34 - SPRINTS/CHANGELOG footers updated to v0.34 / 433 tests Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
118 lines
4.5 KiB
Markdown
118 lines
4.5 KiB
Markdown
# Hermes Web UI — Themes
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Hermes Web UI supports pluggable color themes. Five themes ship built-in, and
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you can create your own with pure CSS — no Python changes needed.
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---
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## Switching Themes
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**Settings panel:** Click the gear icon, select a theme from the dropdown. The
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preview is instant — the UI updates as you click through options.
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**Slash command:** Type `/theme dark` or `/theme light` in the composer.
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**Themes persist** across page reloads and server restarts (stored in
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`settings.json` server-side, with `localStorage` for flicker-free loading).
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---
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## Built-in Themes
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| Theme | Description |
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|-------|-------------|
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| **Dark** (default) | Deep navy/indigo with muted blue accents. Easy on the eyes for long sessions. |
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| **Light** | Warm off-white with dark text. High contrast for bright environments. |
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| **Slate** | Warm charcoal, lighter than Dark. Easier on the eyes for extended use. |
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| **Solarized Dark** | Ethan Schoonover's classic dark palette. Teal background, warm accents. |
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| **Monokai** | Warm dark theme inspired by the Monokai editor scheme. Green/pink accents. |
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| **Nord** | Arctic blue-gray palette from the Nord color system. Calm and minimal. |
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---
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## Creating a Custom Theme
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A theme is a CSS block that overrides the color variables. Add it to
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`static/style.css` (or a separate file that you link after the main stylesheet).
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### Step 1: Define your theme block
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Every color in the UI comes from these CSS variables:
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```css
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:root[data-theme="your-theme-name"] {
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--bg: #1a1a2e; /* Main background */
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--sidebar: #16213e; /* Sidebar background */
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--border: rgba(255,255,255,0.08); /* Subtle borders */
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--border2: rgba(255,255,255,0.14); /* Stronger borders */
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--text: #e8e8f0; /* Primary text color */
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--muted: #8888aa; /* Secondary/muted text */
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--accent: #e94560; /* Accent color (errors, warnings, delete) */
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--blue: #7cb9ff; /* Primary action color (links, active states) */
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--gold: #c9a84c; /* Secondary accent (pinned items, gold highlights) */
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--code-bg: #0d1117; /* Code block background */
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}
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```
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That's it. Override any or all of these variables. The entire UI adapts
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automatically because every color reference uses `var(--name)`.
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### Step 2: Add it to the theme picker (optional)
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To make your theme appear in the Settings dropdown, add an `<option>` to the
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theme `<select>` in `static/index.html`:
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```html
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<option value="your-theme-name">Your Theme Name</option>
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```
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And update the `/theme` command's valid theme list in `static/commands.js`.
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### Step 3: Test it
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Switch to your theme via `/theme your-theme-name` or the Settings panel.
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Check these areas:
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- Sidebar session list (hover states, active state, project borders)
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- Message bubbles (user vs assistant styling)
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- Code blocks (background contrast, copy button visibility)
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- Tool cards (running indicator, expand/collapse)
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- Settings panel and login page
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- Mobile layout (hamburger sidebar, bottom nav)
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### Tips
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- **Light themes** need additional scrollbar overrides to avoid dark scrollbars
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on a light background. See the built-in light theme for the pattern.
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- The **logo gradient** uses `--accent` automatically, so it adapts to your
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theme without extra work.
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- **Prism.js syntax highlighting** uses its own CDN stylesheet (Tomorrow theme).
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It works well on dark themes; on light themes the contrast is acceptable but
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not perfect. Custom Prism theme support is planned for a future update.
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- **No server changes needed.** The `theme` setting in `settings.json` accepts
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any string — your custom theme name will persist without code changes.
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---
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## How Themes Work Internally
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1. Each theme is a `:root[data-theme="name"]` CSS block that overrides variables.
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2. Switching themes sets `document.documentElement.dataset.theme = name` in JS.
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3. A tiny inline `<script>` in `<head>` reads `localStorage` before the
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stylesheet loads — this prevents a flash of the wrong theme on page load.
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4. The theme preference is saved server-side via `POST /api/settings` and
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loaded on boot via `GET /api/settings`.
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5. The `/theme` command and Settings dropdown both update the DOM, localStorage,
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and server settings simultaneously.
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---
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## Contributing a Theme
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To contribute a new built-in theme:
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1. Add your `:root[data-theme="name"]` block to `static/style.css`
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2. Add the `<option>` to the Settings panel in `static/index.html`
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3. Add the theme name to the valid list in `cmdTheme()` in `static/commands.js`
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4. Test on desktop and mobile
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5. Open a PR — themes are pure CSS additions with no backend changes needed
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