Bbc
Ecosystem Index
Deep indigo geometry, crisp sans-serif clarity, spacious and quietly authoritative.




Click any value to copy. Roles are suggestions, not gospel.
Read off the live site. Treat it as reference, not a recipe.
| Role | Family | Size | Weight | Leading | Tracking | Sample |
|---|---|---|---|---|---|---|
| h2 | Source Sans Pro | 22px | 400 | 1.4 | 0 | Aa Bb Cc |
| h3 | Source Sans 3 | 18px | 400 | 1.3 | 0 | Aa Bb Cc |
| body | Source Sans 3 | 14px | 400 | 1 | 0 | Aa Bb Cc |
| button | Arial | 13px | 400 | 1.4 | 0 | Aa Bb Cc |
Max content width 1440px
:root {
--color-dominant: #385ea7;
--color-surface: #04348c;
--color-ink: #aabbdc;
--color-accent: #aca95b;
--color-detail: #c6b5a4;
}
/* CSS variables exposed by source */
:root {
--border: #E1E1E1;
--font-size-5: clamp(1.375rem, 2.65vw, 1.75rem);
--text-body: #303030;
--primary-70: #4C6EB0;
--primary-80: #3359A5;
--font-size-2: clamp(0.875rem, 2.65vw, 1rem);
--primary-90: #1A4599;
--primary-40: #99ACD2;
--font-size-8: clamp(2rem, 2.65vw, 3.25rem);
--text-links: #1A4599;
--primary-20: #CCD6E8;
--text-hint: #767676;
--primary-100: #CFDBF3;
--font-size-3: clamp(0.75rem, 2.65vw, 0.875rem);
--primary-50: #8098C6;
--font-size-7: clamp(1rem, 2.65vw, 1.125rem);
--background: white;
--primary-300: #597ABA;
--border-input: #BBBBBB;
--font-size-1: clamp(1.125rem, 2.65vw, 1.25rem);
--primary: #00308E;
--font-size-4: clamp(0.688rem, 2.65vw, 0.75rem);
--primary-5: #F2F5F9;
--font-size-6: clamp(1.25rem, 2.65vw, 1.5rem);
--primary-hover: #4C6EB0;
--primary-30: #B3C1DD;
--primary-400: #054CD8;
--primary-200: #95ABD5;
--primary-10: #E5EAF4;
--primary-500: #00308E;
--font-size-9: clamp(2.75rem, 2.65vw, 3.875rem);
--primary-900: #001745;
--primary-60: #6683BB;
--aa-font-weight-regular: 400;
--red-light: #eecccc;
--dark-mode-search-input: #323B49;
--body-font-cn: Helvetica, "Microsoft YaHei New", "Microsoft Yahei", "微软雅黑", 宋体, SimSun, STXihei, "华文细黑", sans-serif;
--body-font: 'Source Sans 3', 'Source Sans Pro', 'Helvetica', sans-serif;
--aa-shade-neutral-25: #F7F8F8;
--aa-z-index-base: 0;
--aa-environment-subtle-zone: #00153D;
--neutral-800: #333841;
--neutral-300: #D2D3D5;
--aa-text-case-capitalize: capitalize;
--aa-shade-neutral-600: #27292E;
--aa-modifier-light-4: rgba(255,255,255,0.3);
--neutral-100: #F4F4F5;
--aa-size-sm: 24px;
--red: #bb3232;
--aa-letter-spacing-wide: 0.05em;
--aa-shade-neutral-400: #616873;
--custom-black: #303030;
--aa-font-size-sm: 14px;
--aa-radius-lg: 12px;
--aa-opacity-25: 0.25;
--aa-feedback-info-strong: #3B81BA;
--aa-line-height-relaxed: 32px;
--aa-scrim-lighter: rgba(255,255,255,0.82);
--blue-ad-light: #003CB2;
--aa-feedback-info-subtle: #DCE8F3;
}Drop-in prompt
Build a landing page in the visual style of Archdaily.
Reference design system (extracted from the live site):
- Palette: #385ea7, #04348c, #aabbdc, #aca95b, #c6b5a4
- Typefaces: Source Sans Pro, Source Sans 3, Arial
- Macrostructure: Ecosystem Index
Use the dominant colour for surfaces, the accent sparingly,
and lean on type weight + scale rather than colour for hierarchy.
Full DESIGN.md: https://inspomcp.dev/api/design/archdaily-com