commit 60f978f790bbafbfe3260c1ebd3fb1191e1ba8ed
Author: hkri <hkri@protonmail.com>
Date:   Sun Jul 18 02:38:42 2021 +0800

    Initial commit.

diff --git a/README.md b/README.md
new file mode 100644
index 0000000..7e2a321
--- /dev/null
+++ b/README.md
@@ -0,0 +1,15 @@
+# Tic-Tac-Toe
+
+A simple tic-tac-toe game.
+
+<p align="center">
+  <img src="screenshot.png" alt="screenshot"/>
+</p>
+
+## Local Setup
+
+- Run with PHP local server, then open http://localhost:8080:
+    ```sh
+    php -S localhost:8080 -t dist
+    ```
+- Directly open `dist/index.html` on a web browser.
diff --git a/dist/css/app.css b/dist/css/app.css
new file mode 100644
index 0000000..88532d7
--- /dev/null
+++ b/dist/css/app.css
@@ -0,0 +1,244 @@
+* {
+  outline: none;
+}
+
+body {
+  background-color: #171717;
+  font-family: sans-serif;
+}
+
+body:after {
+  content: '';
+  position: fixed;
+  top: 0;
+  bottom: 0;
+  left: 0;
+  right: 0;
+  opacity: 0.3;
+  background-image: url(data:image/png;base64,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);
+  pointer-events: none;
+  z-index: 0;
+}
+
+main {
+  margin: 0 auto;
+  max-width: 420px;
+  min-width: 280px;
+}
+
+@media(max-width: 864px) {
+  main {
+    padding: 0 16px;
+  }
+}
+
+footer {
+  margin-top: 4em;
+  text-align: center;
+  font-size: 12px;
+  text-transform: uppercase;
+  color: rgba(255, 255, 255, 0.7);
+  text-shadow: -1px -1px 0 rgba(0, 0, 0, 0.9);
+}
+
+footer a {
+  text-decoration: none;
+  color: inherit;
+}
+
+.metallic {
+  background: rgb(238,238,238);
+  background: linear-gradient(0deg, rgba(238,238,238,1) 0%, rgba(212,212,212,1) 50%, rgba(223,223,223,1) 50%, rgba(255,255,255,1) 100%);
+  background-clip: text;
+  -webkit-background-clip: text;
+  -webkit-text-fill-color: transparent;
+}
+
+.shadow {
+  text-shadow: 1px 1px 5px rgba(0, 0, 0, 0.25);
+}
+
+/* Player Panel */
+
+section.player-panel {
+  width: 100%;
+  height: 55px;
+  margin-bottom: 16px;
+  display: flex;
+  justify-content: space-between;
+}
+
+section.player-panel button {
+  position: relative;
+  height: 100%;
+  width: 25%;
+  padding: 0 1em;
+  box-sizing: border-box;
+  border: 1px solid rgba(0, 0, 0, 0.8);
+  background: linear-gradient(0deg, rgba(40, 40, 40, 1) 0%, rgba(52, 52, 53, 1) 100%);
+  box-shadow: 0px 0px 8px rgba(0, 0, 0, 0.6);
+  border-radius: 6px;
+  color: rgba(255, 255, 255, 0.9);
+  text-shadow: 0px -1px 0px rgba(0, 0, 0, 0.9);
+  overflow: hidden;
+}
+
+section.player-panel button:before {
+  content: ' ';
+  position: absolute;
+  top: 0;
+  left: 0;
+  bottom: 0;
+  right: 0;
+  border-top: 1px solid rgb(255, 255, 255, 0.1);
+  border-radius: 6px;
+  box-shadow: inset 0px 0px 1px rgba(255, 255, 255, 0.2);
+}
+
+section.player-panel button:after {
+  content: ' ';
+  position: absolute;
+  top: 0;
+  left: 0;
+  bottom: 0;
+  right: 0;
+  border-bottom: 3px solid rgb(0, 0, 0, 0.4);
+  border-radius: 6px;
+  box-shadow: inset 0px 0px 1px rgba(255, 255, 255, 0.2);
+  transition: box-shadow 0.1s ease-in-out;
+}
+
+section.player-panel button:hover:after {
+  box-shadow: inset 0px 0px 3px rgba(9, 167, 240, 0.7);
+}
+
+section.player-panel :not(button[disabled]):active {
+  padding-top: 2px;
+  box-shadow: 0 0 1px rgba(255, 255, 255, 0.2);
+}
+
+section.player-panel :not(button[disabled]):active:before {
+  border: none;
+  box-shadow: none;
+}
+
+section.player-panel :not(button[disabled]):active:after {
+  box-shadow: inset 0px 0px 16px rgba(0, 0, 0, 0.8);
+}
+
+section.player-panel button[disabled] {
+  box-shadow: 0 1px 1px rgba(255, 255, 255, 0.08);
+  background: linear-gradient(0deg, rgba(42, 42, 42, 1) 0%, rgba(47, 47, 47, 1) 100%);
+}
+
+section.player-panel button[disabled]:before,
+section.player-panel button[disabled]:after {
+  border: none;
+  box-shadow: none;
+}
+
+section.player-panel button[disabled]:before {
+  border: 1px solid rgb(255, 255, 255, 0.08);
+}
+
+section.player-panel button[disabled]:hover:after {
+  box-shadow: none;
+}
+
+section.player-panel button.player-select {
+  width: 30%;
+}
+
+section.player-panel button span.light {
+  position: absolute;
+  width: 16px;
+  height: 5px;
+  background-color: rgb(0, 0, 0, 0.7);
+  left: 50%;
+  top: 8px;
+  transform: translateX(-50%) translateY(-50%);
+  border-top: 1px solid rgba(0, 0, 0, 0.5);
+  border-bottom: 1px solid rgba(255, 255, 255, 0.3);
+  border-radius: 2px;
+  transition: background-color 0.2s ease-in-out, box-shadow 0.2s ease-in-out;
+}
+
+section.player-panel :not(button[disabled]):active span.light {
+  top: 9px;
+  transition: background-color 0.1s ease-in-out, box-shadow 0.1s ease-in-out;
+}
+
+section.player-panel button span.light.blue {
+  background-color: rgb(12, 158, 255);
+  box-shadow: 0 0 10px rgba(10, 165, 255, 0.8);
+}
+
+section.player-panel button span.light.red {
+  background-color: rgba(255, 12, 12);
+  box-shadow: 0 0 10px rgb(255, 21, 25);
+}
+
+section.player-panel button span.light.green {
+  background-color: rgb(59, 255, 131);
+  box-shadow: 0 0 10px rgb(45, 255, 80);
+}
+
+/* /Player Panel */
+
+/* Stage */
+
+section.stage {
+  overflow: hidden;
+  display: grid;
+  background-color: #0a0a0a;
+  box-shadow: 0px 0px 3px rgba(255, 255, 255, 0.15);
+  border: 2px solid #020205;
+  border-radius: 16px;
+  grid-template-columns: 33.33% 33.33% 33.33%;
+}
+
+section.stage button {
+  color: white;
+  font-size: 100px;
+  height: 180px;
+  padding: 0;
+  outline: none;
+  border: 1px solid #131314;
+  background-color: rgb(10, 10, 10);
+  box-shadow: inset 0px 0px 8px rgba(0, 0, 0, 1);
+  border-radius: 8px;
+  transition: border 0.15s ease-in-out,
+    box-shadow 0.15s ease-in-out,
+    background-color 0.15s ease-in-out;
+}
+
+section.stage button[disabled].circle {
+  color: rgb(243, 43, 43);
+  text-shadow: 0px 0px 5px rgba(255, 104, 104, 0.3);
+  background-color: rgba(255, 0, 0, 0.04);
+}
+
+section.stage :not(button[disabled]).circle:hover {
+  border: 1px solid rgba(255, 0, 0, 0.5);
+  box-shadow: inset 0px 0px 32px rgba(255, 0, 0, 0.3);
+}
+
+section.stage button[disabled].cross {
+  color: rgb(43, 146, 255);
+  text-shadow: 0px 0px 5px rgba(174, 213, 255, 0.25);
+  background-color: rgba(31, 62, 163, 0.04);
+}
+
+section.stage :not(button[disabled]).cross:hover {
+  border: 1px solid rgba(0, 102, 255, 0.5);
+  box-shadow: inset 0px 0px 32px rgba(0, 102, 255, 0.3);
+}
+
+section.stage button[disabled].win {
+  color: rgb(56, 203, 220);
+  border: 1px solid rgba(61, 224, 162, 0.5);
+  background-color: rgba(27, 153, 199, 0.04);
+  box-shadow: inset 0px 0px 4px rgba(0, 102, 255, 0.3);
+}
+
+/* /Stage */
diff --git a/dist/index.html b/dist/index.html
new file mode 100644
index 0000000..933c162
--- /dev/null
+++ b/dist/index.html
@@ -0,0 +1,41 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="UTF-8">
+  <meta http-equiv="X-UA-Compatible" content="IE=edge">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <link rel="stylesheet" href="css/app.css"/>
+  <title>Tic-Tac-Toe</title>
+</head>
+<body>
+  <main>
+    <h1 class="metallic shadow">Tic-Tac-Toe</h1>
+    <section class="player-panel">
+      <button id="buttonCross" class="player-select">
+        <span class="light"></span>
+        Player 1
+      </button>
+      <button id="buttonReset">Reset</button>
+      <button id="buttonCircle" class="player-select">
+        <span class="light"></span>
+        Player 2
+      </button>
+    </section>
+    <section id="stage" class="stage">
+      <button id="0" disabled></button>
+      <button id="1" disabled></button>
+      <button id="2" disabled></button>
+      <button id="3" disabled></button>
+      <button id="4" disabled></button>
+      <button id="5" disabled></button>
+      <button id="6" disabled></button>
+      <button id="7" disabled></button>
+      <button id="8" disabled></button>
+    </section>
+    <footer>
+      2021 &copy; <a href="https://johnespiritu.dev" target="_blank" rel="noopener">John Espiritu</a>
+    </footer>
+  </main>
+  <script src="js/app.js"></script>
+</body>
+</html>
\ No newline at end of file
diff --git a/dist/js/app.js b/dist/js/app.js
new file mode 100644
index 0000000..a156e25
--- /dev/null
+++ b/dist/js/app.js
@@ -0,0 +1,195 @@
+var PLAYER_CIRCLE = 'circle';
+var PLAYER_CROSS = 'cross';
+var PLAYER_WIN = 'win';
+
+var stage = document.getElementById('stage');
+var buttonCircle = document.getElementById('buttonCircle');
+var buttonCross = document.getElementById('buttonCross');
+var buttonReset = document.getElementById('buttonReset');
+var stageButtons = document.querySelectorAll('#stage button');
+
+var currentPlayer = null;
+var state = Object.assign({}, Array(9).fill(null));
+
+function checkWin() {
+  var patterns = [
+    [0, 1, 2], [3, 4, 5], [6, 7, 8],
+    [0, 3, 6], [1, 4, 7], [2, 5, 8],
+    [0, 4, 8], [2, 4, 6],
+  ];
+  for (var i = 0; i < patterns.length; ++i) {
+    var p = patterns[i];
+    if (state[p[0]] === null || state[p[1]] === null || state[p[2]] === null) {
+      continue;
+    }
+    if (state[p[0]] === state[p[1]] && state[p[1]] === state[p[2]]) {
+      return p;
+    }
+  }
+  return false;
+}
+
+function disablePlayerButtons() {
+  buttonCross.disabled = true;
+  buttonCircle.disabled = true;
+}
+
+function enablePlayerButtons() {
+  buttonCross.disabled = false;
+  buttonCircle.disabled = false;
+  setCrossLight(null);
+  setCircleLight(null);
+  setStagePlayer(null);
+  resetStageButtons();
+}
+
+function showWinningMoves(buttonIds) {
+  buttonIds.forEach(function (i) {
+    document.getElementById(i).classList.add(PLAYER_WIN);
+  });
+  if (currentPlayer === PLAYER_CIRCLE) {
+    setCircleLight('green');
+  } else if (currentPlayer === PLAYER_CROSS) {
+    setCrossLight('green');
+  }
+}
+
+function resetStageButtons() {
+  stageButtons.forEach(function (stageButton) {
+    setStageButtonValue(stageButton, null);
+    stageButton.classList.remove(PLAYER_WIN);
+  });
+  setStageButtonsEnabled(false);
+  state = Object.assign({}, Array(9).fill(null));
+}
+
+function setStageButtonsEnabled(enabled = true) {
+  stageButtons.forEach(function (stageButton) {
+    stageButton.disabled = !enabled;
+    if (!enabled) {
+      stageButton.onclick = null;
+      return;
+    }
+    stageButton.onclick = function (evt) {
+      var stageButton = evt.target;
+      switch (currentPlayer) {
+        case PLAYER_CIRCLE:
+          if (setStageButtonValue(stageButton, PLAYER_CIRCLE)) {
+            setStagePlayer(PLAYER_CROSS);
+          }
+          break;
+        case PLAYER_CROSS:
+          if (setStageButtonValue(stageButton, PLAYER_CROSS)) {
+            setStagePlayer(PLAYER_CIRCLE);
+          }
+          break;
+      }
+    }
+  });
+}
+
+function setStagePlayer(player = PLAYER_CIRCLE) {
+  var remainingMoves = 0;
+  stageButtons.forEach(function (stageButton) {
+    if (stageButton.disabled) {
+      return;
+    }
+    stageButton.classList.remove(PLAYER_CIRCLE, PLAYER_CROSS);
+    if (player === null) {
+      return;
+    }
+    stageButton.classList.add(player);
+    currentPlayer = player;
+    switch (player) {
+      case PLAYER_CIRCLE:
+        disablePlayerButtons();
+        setCircleLight();
+        setCrossLight(null);
+        break;
+      case PLAYER_CROSS:
+        disablePlayerButtons();
+        setCrossLight();
+        setCircleLight(null);
+        break;
+    }
+    remainingMoves++;
+  });
+  if (remainingMoves === 0) {
+    setCrossLight(null);
+    setCircleLight(null);
+  }
+}
+
+function setStageButtonValue(stageButton, player = null) {
+  if (player === null) {
+    stageButton.innerHTML = '';
+    stageButton.classList.remove('circle', 'cross');
+    return false;
+  }
+  if (stageButton.innerHTML !== '') {
+    return false;
+  }
+  switch (player) {
+    case PLAYER_CIRCLE:
+      stageButton.innerHTML = '○';
+      stageButton.classList.add('circle');
+      state[stageButton.id] = PLAYER_CIRCLE;
+      break;
+    case PLAYER_CROSS:
+      stageButton.innerHTML = '×';
+      stageButton.classList.add('cross');
+      state[stageButton.id] = PLAYER_CROSS;
+      break;
+  }
+  stageButton.disabled = true;
+  var winningButtonIds = checkWin();
+  if (winningButtonIds !== false) {
+    setStagePlayer(null);
+    setStageButtonsEnabled(false);
+    showWinningMoves(winningButtonIds);
+    return false;
+  }
+  return true;
+}
+
+function setCrossLight(color = 'blue') {
+  var light = document.querySelector('#buttonCross .light');
+  light.classList.remove('blue', 'green');
+  if (color != null) {
+    light.classList.add(color);
+  }
+}
+
+function setCircleLight(color = 'red') {
+  var light = document.querySelector('#buttonCircle .light');
+  light.classList.remove('red', 'green');
+  if (color != null) {
+    light.classList.add(color);
+  }
+}
+
+function resizeStage() {
+  var stageWidth = stage.clientWidth;
+  stage.style.height = stageWidth + 'px';
+  stageButtons.forEach(function (stageButton) {
+    stageButton.style.height = (stageWidth / 3) + 'px';
+    stageButton.style.fontSize = (stageWidth / 6) + 'px';
+  });
+}
+
+buttonCross.onclick = function () {
+  setStageButtonsEnabled(true);
+  setStagePlayer(PLAYER_CROSS);
+}
+
+buttonCircle.onclick = function () {
+  setStageButtonsEnabled(true);
+  setStagePlayer(PLAYER_CIRCLE);
+}
+
+buttonReset.onclick = function () {
+  enablePlayerButtons();
+}
+
+window.onresize = resizeStage;
+window.onload = resizeStage;
\ No newline at end of file
diff --git a/screenshot.png b/screenshot.png
new file mode 100644
index 0000000..8ba8680
Binary files /dev/null and b/screenshot.png differ