🎮 feat: мини-игра Space Jump — платформер с прыжками по пробелу

- физика прыжка с гравитацией
- препятствия со случайной высотой
- счёт, рекорд в localStorage, рост скорости
- поддержка тапа на мобильных

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

script.js

@@ -0,0 +1,134 @@
+const game = document.getElementById("game");
+const player = document.getElementById("player");
+const scoreEl = document.getElementById("score");
+const hintEl = document.getElementById("hint");
+const gameOverEl = document.getElementById("gameOver");
+const finalScoreEl = document.getElementById("finalScore");
+const bestScoreEl = document.getElementById("bestScore");
+
+const GROUND = 50;        // высота земли
+const GRAVITY = 0.55;
+const JUMP_FORCE = 12;
+const START_SPEED = 5;
+
+let running = false;
+let gameOver = false;
+let playerY = 0;          // высота над землёй
+let velocity = 0;
+let speed = START_SPEED;
+let score = 0;
+let best = Number(localStorage.getItem("spaceJumpBest")) || 0;
+let obstacles = [];
+let spawnTimer = 0;
+let lastTime = 0;
+
+function startGame() {
+  obstacles.forEach((o) => o.el.remove());
+  obstacles = [];
+  playerY = 0;
+  velocity = 0;
+  speed = START_SPEED;
+  score = 0;
+  spawnTimer = 0;
+  running = true;
+  gameOver = false;
+  hintEl.style.display = "none";
+  gameOverEl.classList.remove("visible");
+  scoreEl.textContent = "0";
+  lastTime = performance.now();
+  requestAnimationFrame(loop);
+}
+
+function jump() {
+  if (playerY === 0) {
+    velocity = JUMP_FORCE;
+  }
+}
+
+function spawnObstacle() {
+  const el = document.createElement("div");
+  el.className = "obstacle";
+  const height = 30 + Math.random() * 35;
+  el.style.height = height + "px";
+  game.appendChild(el);
+  obstacles.push({ el, x: game.clientWidth, height });
+}
+
+function endGame() {
+  running = false;
+  gameOver = true;
+  best = Math.max(best, score);
+  localStorage.setItem("spaceJumpBest", best);
+  finalScoreEl.textContent = score;
+  bestScoreEl.textContent = best;
+  gameOverEl.classList.add("visible");
+}
+
+function loop(now) {
+  if (!running) return;
+  const dt = Math.min((now - lastTime) / 16.67, 3); // нормализация к 60 FPS
+  lastTime = now;
+
+  // физика игрока
+  velocity -= GRAVITY * dt;
+  playerY += velocity * dt;
+  if (playerY <= 0) {
+    playerY = 0;
+    velocity = 0;
+  }
+  player.style.bottom = GROUND + playerY + "px";
+
+  // спавн препятствий
+  spawnTimer -= dt;
+  if (spawnTimer <= 0) {
+    spawnObstacle();
+    spawnTimer = 60 + Math.random() * 70;
+  }
+
+  // движение препятствий и столкновения
+  const playerLeft = 80;
+  const playerRight = playerLeft + 36;
+
+  for (let i = obstacles.length - 1; i >= 0; i--) {
+    const o = obstacles[i];
+    o.x -= speed * dt;
+    o.el.style.left = o.x + "px";
+
+    if (o.x + 22 < 0) {
+      o.el.remove();
+      obstacles.splice(i, 1);
+      score++;
+      scoreEl.textContent = score;
+      speed += 0.15; // чуть быстрее с каждым очком
+      continue;
+    }
+
+    const hitX = o.x < playerRight - 6 && o.x + 22 > playerLeft + 6;
+    const hitY = playerY < o.height - 4;
+    if (hitX && hitY) {
+      endGame();
+      return;
+    }
+  }
+
+  requestAnimationFrame(loop);
+}
+
+document.addEventListener("keydown", (e) => {
+  if (e.code !== "Space") return;
+  e.preventDefault();
+  if (!running) {
+    startGame();
+  } else {
+    jump();
+  }
+});
+
+// поддержка тапа/клика для мобильных
+game.addEventListener("pointerdown", () => {
+  if (!running) {
+    startGame();
+  } else {
+    jump();
+  }
+});