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+<!doctype html>
+<html lang="zh-CN">
+<head>
+  <meta charset="UTF-8" />
+  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+  <title>Mini Traffic Lights</title>
+  <script src="https://cdn.tailwindcss.com"></script>
+</head>
+<body class="min-h-screen bg-neutral-950 text-neutral-100">
+  <main class="mx-auto flex min-h-screen max-w-3xl flex-col gap-4 px-4 py-5">
+    <header class="flex flex-wrap items-center justify-between gap-3">
+      <div>
+        <h1 class="text-2xl font-semibold tracking-normal">Mini Traffic Lights</h1>
+        <p class="text-sm text-neutral-400">点击格子升级颜色：空到绿，绿到黄，黄到红；任意同色三连即获胜。</p>
+      </div>
+      <button id="resetBtn" class="rounded bg-lime-400 px-4 py-2 text-sm font-semibold text-neutral-950 hover:bg-lime-300">重开</button>
+    </header>
+
+    <section class="grid grid-cols-3 gap-3">
+      <div class="rounded border border-neutral-700 bg-neutral-900 p-3">
+        <div class="text-xs uppercase text-neutral-500">回合</div>
+        <div id="turnLabel" class="text-2xl font-semibold">P1</div>
+      </div>
+      <div class="rounded border border-neutral-700 bg-neutral-900 p-3">
+        <div class="text-xs uppercase text-neutral-500">步数</div>
+        <div id="moveCount" class="text-2xl font-semibold">0</div>
+      </div>
+      <div class="rounded border border-neutral-700 bg-neutral-900 p-3">
+        <div class="text-xs uppercase text-neutral-500">状态</div>
+        <div id="stateLabel" class="text-2xl font-semibold">进行</div>
+      </div>
+    </section>
+
+    <section class="rounded border border-neutral-700 bg-neutral-900 p-4">
+      <div class="mb-4 flex items-center justify-between gap-3">
+        <h2 class="text-lg font-semibold">棋盘</h2>
+        <span id="message" class="text-sm text-lime-300">P1 行动。</span>
+      </div>
+      <div id="board" class="mx-auto grid max-w-md grid-cols-3 gap-3"></div>
+    </section>
+  </main>
+
+  <script>
+    const boardEl = document.getElementById("board");
+    const turnLabelEl = document.getElementById("turnLabel");
+    const moveCountEl = document.getElementById("moveCount");
+    const stateLabelEl = document.getElementById("stateLabel");
+    const messageEl = document.getElementById("message");
+    const resetBtn = document.getElementById("resetBtn");
+
+    const states = ["", "G", "Y", "R"];
+    const labels = { "": "", G: "绿", Y: "黄", R: "红" };
+    const colors = {
+      "": "bg-neutral-800 border-neutral-700",
+      G: "bg-emerald-400 border-emerald-200 text-neutral-950",
+      Y: "bg-yellow-300 border-yellow-100 text-neutral-950",
+      R: "bg-red-500 border-red-200 text-white"
+    };
+    const lines = [
+      [0, 1, 2], [3, 4, 5], [6, 7, 8],
+      [0, 3, 6], [1, 4, 7], [2, 5, 8],
+      [0, 4, 8], [2, 4, 6]
+    ];
+
+    let board = [];
+    let player = 1;
+    let moves = 0;
+    let winner = null;
+    let winningLine = [];
+
+    function resetGame() {
+      board = Array(9).fill("");
+      player = 1;
+      moves = 0;
+      winner = null;
+      winningLine = [];
+      setMessage("P1 行动。");
+      render();
+    }
+
+    function setMessage(text) {
+      messageEl.textContent = text;
+    }
+
+    function upgradeCell(index) {
+      if (winner) return;
+      const current = board[index];
+      if (current === "R") {
+        setMessage("红灯不能再升级。");
+        return;
+      }
+      board[index] = states[states.indexOf(current) + 1];
+      moves += 1;
+      const colorWin = checkWinner();
+      if (colorWin) {
+        winner = player;
+        setMessage(`P${player} 用${labels[colorWin]}灯连成三格。`);
+      } else if (board.every((cell) => cell === "R")) {
+        winner = "draw";
+        setMessage("所有格子都是红灯，平局。");
+      } else {
+        player = player === 1 ? 2 : 1;
+        setMessage(`P${player} 行动。`);
+      }
+      render();
+    }
+
+    function checkWinner() {
+      for (const line of lines) {
+        const [a, b, c] = line;
+        if (board[a] && board[a] === board[b] && board[b] === board[c]) {
+          winningLine = line;
+          return board[a];
+        }
+      }
+      winningLine = [];
+      return "";
+    }
+
+    function cellText(value) {
+      return labels[value] || "+";
+    }
+
+    function renderCell(value, index) {
+      const button = document.createElement("button");
+      button.type = "button";
+      button.className = `aspect-square rounded border text-3xl font-semibold shadow-sm transition hover:scale-[1.02] ${colors[value]}`;
+      if (winningLine.includes(index)) button.classList.add("ring-4", "ring-white");
+      button.textContent = cellText(value);
+      button.disabled = Boolean(winner);
+      button.addEventListener("click", () => upgradeCell(index));
+      return button;
+    }
+
+    function render() {
+      boardEl.innerHTML = "";
+      board.forEach((cell, index) => {
+        boardEl.appendChild(renderCell(cell, index));
+      });
+      turnLabelEl.textContent = winner ? "-" : `P${player}`;
+      moveCountEl.textContent = moves;
+      stateLabelEl.textContent = winner ? "结束" : "进行";
+    }
+
+    resetBtn.addEventListener("click", resetGame);
+    resetGame();
+  </script>
+</body>
+</html>
