Style rules (design themes)

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Every themed overlay (title band, captions on a paper band, notes card, 本段 chip, quote card, stamps, pop words, progress line, chapter rule, marker sweep, number counter, lower third) reads its colours, fonts, shapes and motion from one design theme (lib/vstudio/theme.py). These rules are what the presets encode. Follow them when you add an effect, write a workflow script, or pick colours by hand. Report them like the aesthetics checklist (S3 ✓ / S3 ✗ (where)).

Themes

id	中文	Look	Use for
`editorial` (default)	编辑感	Warm paper `#F5F1EA`, deep ink, one terracotta accent `#A84F2D`; titles and quotes in Noto Serif SC; keywords get a soft marker band	Most 口播 / 复盘 / 干货. The safe premium choice
`mono`	黑白灰	Neutral paper, near-black ink, a pale yellow marker, no colour accent	Opinion / tech / 干货 where colour would distract
`soft`	低饱和柔和	Stone white, sage green accent, bigger radius, lighter shadow	Lifestyle, gentle sharing
`night`	夜间	Charcoal paper, warm ivory ink, amber accent; keywords in amber	Night talks, mood pieces, dark footage
`xhs-pop`	小红书红（克制版）	The 小红书 red, on one keyword only; white cards, hairlines	When the creator wants the platform-native red
`classic`	旧版	The pre-theme look (red title half, black notes card with red header, slamming stamps)	Only to reproduce old videos; never offered as a new look

Choosing a theme (first that is set wins): output edit theme op → $VSTUDIO_THEME → recipe / project param theme → client theme (client.yaml) → persona style.theme → legacy (persona brand.accent set and no theme anywhere = classic, so old setups do not change under the creator) → editorial. A layer may tint tokens: style: {theme: editorial, accent: "#3E5C76"}. Explicit per-element colours (an effect’s color, a caption style’s color / highlight, a title’s color / band_color) always win; the theme op clears them (restyle: false keeps them).

Fonts are OFL only: Noto Sans SC / Noto Serif SC (Source Han). Never ship GPL or non-commercial fonts.

Rules

S1. One accent per frame. The theme accent is a signal, not a fill. Use it for one thing per frame: a short rule, a label dot, the progress fill, one keyword. Never for a whole title half, a card header or a box border.

S2. At most one emphasised keyword per line. 【keyword】 runs beyond the first in a line render plain (emph_per_line). Emphasis is weight + the theme’s treatment (marker band on paper, colour on dark / pop themes), never weight + colour + size + stroke at once.

S3. No saturated red on a light background by default. #FF2442-class reds on cream read as alarm. Only xhs-pop uses red, and it is a deeper #D42A43 on one keyword.

S4. Notes are paper, not dashboards. A notes card is a light card (theme card), a small tracked label with a dot (记笔记 / 本段), the title in strong ink, a hairline rule, then rows. No coloured header bar, no black body, no rotated tag.

S5. Quotes are typography. Hierarchy comes from weight and size: main line in the quote face (serif in editorial / night), sub line smaller in secondary ink, a short accent rule above, the opening mark hanging in the margin in secondary ink. No clip-art coloured quote glyph.

S6. Stamps and pop words are quiet. A stamp is a small card label (dot + tracked text), upright, rising in. A pop word is white with a soft shadow and a thin accent bar, no thick stroke, no tilt. The 8° slam with a 2.2× overshoot belongs to classic / xhs-pop only.

S7. Motion: 200–350 ms, ease-out, small distances. Overlays fade and rise 1–2 % of the frame (rise) over the theme’s motion.in_s (≈ 0.28 s, cubic ease-out) and leave in ≈ 0.2 s. No overshoot unless the theme sets motion.overshoot. Stage segments push 60 px, not 80+.

S8. Grid and margins. Keep text inside the platform safe box; align cards and labels to one left margin per layout (≈ 40 px at 1080 wide); one radius per theme; one shadow per theme (soft, low alpha).

S9. Captions: contrast ≥ 4.5 : 1. On a paper band, captions are theme ink without stroke (the engine detects a flat band under the caption). Over video they are white with a thin dark stroke and a soft shadow. Check theme.contrast(ink, paper) >= 4.5; the tests enforce it for every preset.

S10. Progress is a hairline. A 3–4 px track in the rule colour with the accent fill, small gaps between chapters. No knob, no glow, no pill.

S11. New effects read the theme. Add a token to theme._BASE rather than a colour literal. Accept an explicit color param for one-off overrides, default None = theme.

Where

Tokens + resolution: lib/vstudio/theme.py (current(), resolve(), use(), css_vars() for HTML).
Themed blocks: lib/vstudio/overlays.py (title_band, notes_panel paper layout, notes_chip, quote_block, stamp, progress_line, marker_line, chapter_rule, counter, lower_third), draw.emph_layer (theme-aware text with marker / colour / underline emphasis).
Output edit: {"op": "theme", "theme": "editorial"} (“换成更高级的配色”, “换成黑白”, “夜间模式”).
Tests: tests/test_theme.py.