TIDRA ICONS · 1.0 · 21 icons, three families

Ecosystems: seagrass, saltmarsh, mangrove, open water, reef
Fieldwork: boat, diver, quadrat, transect, seedling, sediment core, eDNA, tide gauge
Instruments, contract and alerts: buoy, sensor, verified, payment, contract, alert, cyclone, heatwave

Rules
- 24 px grid, 2 px safe area, stroke 1.6 px, round caps and joins, no fills.
- Below 20 px use the "16px (2 stroke)" files. Never scale the stroke with the icon.
- Ink on cream, cream on ink. Ecosystem icons may sit on their ecosystem colour, in cream.
- Change colour with the stroke attribute (or currentColor in the sprite).

Web: <svg><use href="tidra-icons-sprite.svg#tidra-seagrass"/></svg>
Figma: drag the SVG files onto the canvas; each icon stays an editable vector.
