How to use

Pick the sport in Settings (Jokgu / Futnet). Changing sport or Futnet type during a match clears the current scores.
Jokgu: 4 court players, 15 points per set, win by 2, deuce from 14–14. Match is best of 3 only (first to 2 sets).
Jokgu 0–0: pick first serve with the team name, discs 1–4, or left/right. Disc 4 is a court player. Discs sit in a vertical column on the outer edge: left team 1 at the bottom, right team 1 at the top.
Jokgu: either team can score. A receive-team point takes serve, and the previous serving team advances 1→2→3→4. Consecutive points by the serving team keep the same number. If the receive team scores first, they start on disc 1.
Futnet: 11 points, win by 2, cap 15 (15–14 ends the set). Always best of 3. Single 1 / Double 2 / Triple 3 (default Double).
Futnet: the team that just scored serves. No forced rotation. In Double/Triple tap a disc to mark the server. Single uses ① only; that team’s score even = R, odd = L (0 = R).
Short tap on the big number: +1. Long press: −1. There is no −1 button on the board.
Android APK during a rally: left click = left side +1, right click = right side +1, long press = −1.
Change ends after a set. Undo restores the previous state.
New match is the large gold button in the center column, stacked above the big scores. It works in Cyber and Ring looks, and before first serve. Tapping it asks Cancel or OK on the board.
Simple mode shows large scores and sets only. The bottom row keeps Undo and Full view. Turn it on after first serve is chosen.
Player discs and numbers are large. The serving disc is larger still, with a gold fill. Disc numbers stay in place.
Settings: language (한국어 / English / 中文), board look, OFL font, and score reading. Stored on this device only.
Board looks reuse Score colors and frames. No venue PNGs and no camera. Cyber look still lets you tap scores and discs.
Score reading uses device TTS (or the browser voice on the web). No table-tennis MP3 pack and no mic commands.
On Android the board advertises the same BLE score packet used by the existing Score watch app. No camera or microphone permission.
Scores stay on this device only (jokgu_scoreboard_state_v1).
Fonts: SIL OFL — Noto Sans KR, Jua, Do Hyeon, Orbitron. No GPL libraries.