Snake_Game/index.html at main · Agent-A345/Snake_Game · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Snake Game</title>
<link href="https://fonts.googleapis.com/css2?family=Orbitron:wght@400;700;900&family=Share+Tech+Mono&display=swap" rel="stylesheet">
<style>
  :root {
    --bg-deep: #020d06;
    --bg-mid: #061a0b;
    --green-neon: #00ff6a;
    --green-bright: #39ff99;
    --green-dim: #0a5c2a;
    --green-glow: rgba(0,255,106,0.18);
    --apple-red: #ff2d55;
    --apple-glow: rgba(255,45,85,0.35);
    --amber: #ffcc00;
    --panel-bg: rgba(4,22,10,0.92);
    --border: rgba(0,255,106,0.22);
    --font-hud: 'Share Tech Mono', monospace;
    --font-title: 'Orbitron', sans-serif;
  }

  *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

  html, body {
    width: 100%; height: 100%;
    background: var(--bg-deep);
    color: var(--green-neon);
    font-family: var(--font-hud);
    overflow: hidden;
    user-select: none;
  }

  body {
    display: flex; flex-direction: column;
    align-items: center; justify-content: center;
    min-height: 100vh;
    background:
      radial-gradient(ellipse 80% 60% at 50% 0%, #003d1a 0%, transparent 70%),
      radial-gradient(ellipse 60% 80% at 10% 100%, #001a0d 0%, transparent 60%),
      radial-gradient(ellipse 50% 50% at 90% 80%, #002211 0%, transparent 60%),
      linear-gradient(170deg, #020d06 0%, #000a03 100%);
  }

  /* ── SCANLINES OVERLAY ── */
  body::before {
    content: '';
    position: fixed; inset: 0; z-index: 9999;
    pointer-events: none;
    background: repeating-linear-gradient(
      0deg,
      transparent,
      transparent 2px,
      rgba(0,0,0,0.06) 2px,
      rgba(0,0,0,0.06) 4px
    );
    animation: scanPan 12s linear infinite;
  }
  @keyframes scanPan {
    from { background-position: 0 0; }
    to   { background-position: 0 400px; }
  }

  /* ── WRAPPER ── */
  #wrapper {
    position: relative;
    display: flex; flex-direction: column;
    align-items: center;
    gap: 12px;
    padding: 16px;
  }

  /* ── TITLE BAR ── */
  #titleBar {
    width: 100%;
    display: flex; align-items: center; justify-content: space-between;
    gap: 12px;
  }

  h1.brand {
    font-family: var(--font-title);
    font-size: clamp(11px, 2vw, 15px);
    font-weight: 900;
    letter-spacing: 0.15em;
    color: var(--green-neon);
    text-shadow: 0 0 10px var(--green-neon), 0 0 30px rgba(0,255,106,0.4);
    white-space: nowrap;
  }

  .hud-group {
    display: flex; align-items: center; gap: 10px;
  }

  .hud-pill {
    background: var(--panel-bg);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 4px 12px;
    font-size: clamp(10px,1.6vw,13px);
    letter-spacing: 0.08em;
    color: var(--green-bright);
  }
  .hud-pill span { color: var(--amber); font-weight: bold; }

  /* ── CANVAS FRAME ── */
  #canvasFrame {
    position: relative;
    border-radius: 8px;
    padding: 3px;
    background: linear-gradient(145deg, rgba(0,255,106,0.4) 0%, rgba(0,80,30,0.1) 50%, rgba(0,255,106,0.25) 100%);
    box-shadow:
      0 0 0 1px rgba(0,255,106,0.12),
      0 0 30px rgba(0,255,106,0.15),
      0 0 80px rgba(0,255,106,0.07),
      inset 0 0 30px rgba(0,0,0,0.8);
  }

  #gameCanvas {
    display: block;
    border-radius: 6px;
    image-rendering: pixelated;
    background: #010f05;
  }

  /* ── ICON BUTTONS ── */
  .icon-btn {
    background: var(--panel-bg);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--green-neon);
    font-size: 16px;
    width: 34px; height: 34px;
    display: flex; align-items: center; justify-content: center;
    cursor: pointer;
    transition: all 0.2s;
    flex-shrink: 0;
  }
  .icon-btn:hover {
    background: rgba(0,255,106,0.1);
    box-shadow: 0 0 12px rgba(0,255,106,0.3);
    border-color: var(--green-neon);
  }

  /* ── MOBILE D-PAD ── */
  #dpad {
    display: none;
    grid-template-columns: repeat(3, 44px);
    grid-template-rows: repeat(3, 44px);
    gap: 4px;
    margin-top: 4px;
  }
  .dp {
    background: var(--panel-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--green-neon);
    font-size: 18px;
    display: flex; align-items: center; justify-content: center;
    cursor: pointer;
    transition: all 0.12s;
    -webkit-tap-highlight-color: transparent;
  }
  .dp:active, .dp.pressed {
    background: rgba(0,255,106,0.18);
    box-shadow: 0 0 14px rgba(0,255,106,0.4);
    transform: scale(0.92);
  }
  .dp-center { background: rgba(0,255,106,0.06); border-color: transparent; }

  @media (pointer: coarse), (max-width: 600px) {
    #dpad { display: grid; }
  }

  /* ── OVERLAY SCREENS ── */
  .overlay {
    position: absolute; inset: 0;
    border-radius: 6px;
    display: flex; flex-direction: column;
    align-items: center; justify-content: center;
    gap: 20px;
    background: rgba(1,10,4,0.93);
    backdrop-filter: blur(2px);
    z-index: 10;
    transition: opacity 0.4s, visibility 0.4s;
  }
  .overlay.hidden { opacity: 0; visibility: hidden; pointer-events: none; }

  .overlay-title {
    font-family: var(--font-title);
    font-weight: 900;
    letter-spacing: 0.12em;
    text-align: center;
    line-height: 1.1;
  }

  .title-main {
    font-size: clamp(20px, 5vw, 38px);
    color: var(--green-neon);
    text-shadow: 0 0 20px var(--green-neon), 0 0 60px rgba(0,255,106,0.4), 0 0 100px rgba(0,255,106,0.2);
    animation: titlePulse 2.8s ease-in-out infinite;
  }
  .title-sub {
    font-size: clamp(9px, 1.8vw, 13px);
    color: rgba(0,255,106,0.5);
    letter-spacing: 0.3em;
    margin-top: 6px;
  }

  @keyframes titlePulse {
    0%,100% { text-shadow: 0 0 20px var(--green-neon), 0 0 60px rgba(0,255,106,0.4); }
    50%      { text-shadow: 0 0 30px var(--green-neon), 0 0 90px rgba(0,255,106,0.6), 0 0 140px rgba(0,255,106,0.25); }
  }

  .nokia-logo {
    font-family: var(--font-title);
    font-size: clamp(8px,1.4vw,11px);
    color: rgba(0,255,106,0.3);
    letter-spacing: 0.5em;
    text-transform: uppercase;
  }

  .score-display {
    font-family: var(--font-title);
    font-size: clamp(28px,6vw,52px);
    font-weight: 900;
    color: var(--amber);
    text-shadow: 0 0 20px rgba(255,204,0,0.7), 0 0 50px rgba(255,204,0,0.3);
  }
  .score-label {
    font-size: clamp(11px,2vw,14px);
    color: rgba(0,255,106,0.55);
    letter-spacing: 0.2em;
  }
  .hi-label {
    font-size: clamp(9px,1.5vw,11px);
    color: rgba(0,255,106,0.4);
    letter-spacing: 0.1em;
    margin-top: -8px;
  }

  /* ── CTA BUTTON ── */
  .cta-btn {
    position: relative;
    font-family: var(--font-title);
    font-weight: 700;
    font-size: clamp(11px,2vw,14px);
    letter-spacing: 0.2em;
    color: var(--bg-deep);
    background: linear-gradient(135deg, #00ff6a, #00cc55);
    border: none;
    border-radius: 6px;
    padding: 13px 36px;
    cursor: pointer;
    overflow: hidden;
    box-shadow: 0 0 20px rgba(0,255,106,0.5), 0 4px 20px rgba(0,0,0,0.5);
    transition: all 0.2s;
  }
  .cta-btn::before {
    content: '';
    position: absolute; inset: 0;
    background: linear-gradient(180deg, rgba(255,255,255,0.25) 0%, transparent 60%);
    border-radius: 6px;
  }
  .cta-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 35px rgba(0,255,106,0.7), 0 8px 30px rgba(0,0,0,0.5);
  }
  .cta-btn:active { transform: translateY(0); }

  /* ── PARTICLE CANVAS ── */
  #particleCanvas {
    position: absolute; inset: 0;
    pointer-events: none;
    border-radius: 6px;
    z-index: 5;
  }

  /* ── KEY HINTS ── */
  .key-hints {
    display: flex; gap: 8px; flex-wrap: wrap; justify-content: center;
  }
  .key-chip {
    background: rgba(0,255,106,0.06);
    border: 1px solid rgba(0,255,106,0.18);
    border-radius: 4px;
    padding: 3px 8px;
    font-size: clamp(9px,1.4vw,11px);
    color: rgba(0,255,106,0.45);
    letter-spacing: 0.05em;
  }

  /* ── SPEED TICKER ── */
  #speedBar {
    width: 100%;
    display: flex; align-items: center; gap: 8px;
  }
  .bar-label { font-size: 10px; color: rgba(0,255,106,0.35); letter-spacing: 0.1em; }
  .bar-track {
    flex: 1; height: 3px;
    background: rgba(0,255,106,0.08);
    border-radius: 2px;
    overflow: hidden;
  }
  .bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--green-dim), var(--green-neon));
    border-radius: 2px;
    transition: width 0.4s;
    box-shadow: 0 0 6px var(--green-neon);
  }
</style>
</head>
<body>
<div id="wrapper">
  <!-- Title Bar -->
  <div id="titleBar">
    <h1 class="brand">SNAKE GAME</h1>
    <div class="hud-group">
      <div class="hud-pill">SCORE <span id="scoreHud">0</span></div>
      <div class="hud-pill">BEST <span id="bestHud">0</span></div>
      <button class="icon-btn" id="pauseBtn" title="Pause">⏸</button>
      <button class="icon-btn" id="fsBtn" title="Fullscreen">⛶</button>
    </div>
  </div>

  <!-- Canvas Frame -->
  <div id="canvasFrame">
    <canvas id="gameCanvas"></canvas>
    <canvas id="particleCanvas"></canvas>

    <!-- START SCREEN -->
    <div class="overlay" id="startScreen">
      <div class="nokia-logo">Nokia · 3310</div>
      <div class="overlay-title">
        <div class="title-main">SNAKE GAME</div>
        <div class="title-sub"></div>
      </div>
      <button class="cta-btn" id="startBtn">▶ START GAME</button>
      <div class="key-hints">
        <span class="key-chip">↑↓←→ ARROWS</span>
        <span class="key-chip">WASD</span>
        <span class="key-chip">P PAUSE</span>
      </div>
    </div>

    <!-- PAUSE SCREEN -->
    <div class="overlay hidden" id="pauseScreen">
      <div class="overlay-title title-main" style="font-size:clamp(18px,4vw,32px)">PAUSED</div>
      <button class="cta-btn" id="resumeBtn">▶ RESUME</button>
    </div>

    <!-- GAME OVER SCREEN -->
    <div class="overlay hidden" id="gameOverScreen">
      <div class="score-label">GAME OVER</div>
      <div class="score-display" id="finalScore">0</div>
      <div class="hi-label" id="hiLabel"></div>
      <button class="cta-btn" id="replayBtn">↺ PLAY AGAIN</button>
    </div>
  </div>

  <!-- Speed bar -->
  <div id="speedBar">
    <span class="bar-label">SPD</span>
    <div class="bar-track"><div class="bar-fill" id="speedFill" style="width:10%"></div></div>
    <span class="bar-label" id="levelLbl">LV1</span>
  </div>

  <!-- D-Pad (mobile) -->
  <div id="dpad">
    <div></div>
    <div class="dp" id="dpUp">▲</div>
    <div></div>
    <div class="dp" id="dpLeft">◀</div>
    <div class="dp dp-center"></div>
    <div class="dp" id="dpRight">▶</div>
    <div></div>
    <div class="dp" id="dpDown">▼</div>
    <div></div>
  </div>
</div>

<script>
(() => {
'use strict';

/* ═══════════════════════════════════════
   CONFIG
═══════════════════════════════════════ */
const GRID = 20;
const BASE_FPS = 10;
const MAX_FPS  = 18;

/* ═══════════════════════════════════════
   CANVAS SETUP
═══════════════════════════════════════ */
const canvas  = document.getElementById('gameCanvas');
const ctx     = canvas.getContext('2d');
const pCanvas = document.getElementById('particleCanvas');
const pCtx    = pCanvas.getContext('2d');

function resizeCanvas() {
  const maxW = Math.min(window.innerWidth - 40, 520);
  const maxH = Math.min(window.innerHeight - 220, 520);
  const size = Math.floor(Math.min(maxW, maxH) / GRID) * GRID;
  canvas.width  = pCanvas.width  = size;
  canvas.height = pCanvas.height = size;
  CELL = size / GRID;
}
let CELL;
resizeCanvas();
window.addEventListener('resize', () => { resizeCanvas(); if (!running) drawGame(); });

/* ═══════════════════════════════════════
   AUDIO
═══════════════════════════════════════ */
const AC = window.AudioContext || window.webkitAudioContext;
let ac;
function getAC() { if (!ac) ac = new AC(); return ac; }

function beep(freq = 440, dur = 0.08, type = 'square', vol = 0.12) {
  try {
    const a = getAC();
    const o = a.createOscillator();
    const g = a.createGain();
    o.type = type;
    o.frequency.setValueAtTime(freq, a.currentTime);
    g.gain.setValueAtTime(vol, a.currentTime);
    g.gain.exponentialRampToValueAtTime(0.001, a.currentTime + dur);
    o.connect(g); g.connect(a.destination);
    o.start(); o.stop(a.currentTime + dur);
  } catch(e) {}
}

function eatSound() {
  beep(880, 0.06, 'square', 0.1);
  setTimeout(() => beep(1200, 0.05, 'square', 0.08), 50);
}
function moveSound() { /* subtle – disabled for perf */ }
function gameOverSound() {
  [220, 180, 140].forEach((f, i) => setTimeout(() => beep(f, 0.18, 'sawtooth', 0.09), i * 120));
}
function pauseSound() { beep(660, 0.07, 'triangle', 0.08); }

/* ═══════════════════════════════════════
   STATE
═══════════════════════════════════════ */
let snake, dir, nextDir, apple, score, highScore, running, paused, gameOver, animId, frameInterval, lastTime;

function loadHigh() { return parseInt(localStorage.getItem('snakeHigh') || '0'); }
function saveHigh()  { localStorage.setItem('snakeHigh', highScore); }

function resetGame() {
  const mid = Math.floor(GRID / 2);
  snake   = [{x: mid, y: mid}, {x: mid-1, y: mid}, {x: mid-2, y: mid}];
  dir     = {x: 1, y: 0};
  nextDir = {x: 1, y: 0};
  score   = 0;
  highScore = loadHigh();
  running = false;
  paused  = false;
  gameOver= false;
  spawnApple();
  particles = [];
  updateHud();
  updateSpeedBar();
}

function spawnApple() {
  let pos;
  do {
    pos = {x: Math.floor(Math.random()*GRID), y: Math.floor(Math.random()*GRID)};
  } while (snake.some(s => s.x === pos.x && s.y === pos.y));
  apple = pos;
}

function getLevel() { return Math.floor(score / 5); }
function getFPS()   { return Math.min(BASE_FPS + getLevel() * 1.2, MAX_FPS); }

/* ═══════════════════════════════════════
   UPDATE HUD
═══════════════════════════════════════ */
function updateHud() {
  document.getElementById('scoreHud').textContent = score;
  document.getElementById('bestHud').textContent  = highScore;
}
function updateSpeedBar() {
  const pct = ((getFPS() - BASE_FPS) / (MAX_FPS - BASE_FPS)) * 90 + 10;
  document.getElementById('speedFill').style.width = pct + '%';
  document.getElementById('levelLbl').textContent  = 'LV' + (getLevel()+1);
}

/* ═══════════════════════════════════════
   PARTICLES
═══════════════════════════════════════ */
let particles = [];

function spawnParticles(cx, cy, color, n = 18) {
  for (let i = 0; i < n; i++) {
    const angle = Math.random() * Math.PI * 2;
    const speed = 1.5 + Math.random() * 3.5;
    particles.push({
      x: cx, y: cy,
      vx: Math.cos(angle)*speed, vy: Math.sin(angle)*speed,
      life: 1, decay: 0.03 + Math.random()*0.04,
      r: 2 + Math.random()*3,
      color
    });
  }
}

function updateParticles() {
  pCtx.clearRect(0, 0, pCanvas.width, pCanvas.height);
  particles = particles.filter(p => p.life > 0);
  for (const p of particles) {
    p.x  += p.vx; p.y  += p.vy;
    p.vy += 0.12;
    p.life -= p.decay;
    pCtx.globalAlpha = Math.max(0, p.life);
    pCtx.beginPath();
    pCtx.arc(p.x, p.y, p.r * p.life, 0, Math.PI*2);
    pCtx.fillStyle = p.color;
    pCtx.shadowBlur = 8; pCtx.shadowColor = p.color;
    pCtx.fill();
  }
  pCtx.globalAlpha = 1;
  pCtx.shadowBlur  = 0;
}

/* ═══════════════════════════════════════
   DRAWING
═══════════════════════════════════════ */
function drawGrid() {
  ctx.strokeStyle = 'rgba(0,255,106,0.04)';
  ctx.lineWidth   = 0.5;
  for (let i = 0; i <= GRID; i++) {
    ctx.beginPath(); ctx.moveTo(i*CELL, 0);     ctx.lineTo(i*CELL, canvas.height); ctx.stroke();
    ctx.beginPath(); ctx.moveTo(0, i*CELL);     ctx.lineTo(canvas.width, i*CELL);   ctx.stroke();
  }
}

function drawSnake() {
  const len = snake.length;
  snake.forEach((seg, i) => {
    const t    = 1 - i / len;
    const x    = seg.x * CELL, y = seg.y * CELL;
    const pad  = 1.5;
    const r    = Math.max(2, CELL * 0.28);

    // Body gradient per segment
    const grad = ctx.createRadialGradient(
      x + CELL/2, y + CELL/2, 0,
      x + CELL/2, y + CELL/2, CELL * 0.7
    );
    if (i === 0) {
      grad.addColorStop(0, '#80ffb8');
      grad.addColorStop(0.5, '#00ff6a');
      grad.addColorStop(1, '#00802c');
    } else {
      const g1 = `rgba(0,${Math.floor(180*t+75)},${Math.floor(80*t)},1)`;
      const g2 = `rgba(0,${Math.floor(100*t+30)},${Math.floor(40*t)},1)`;
      grad.addColorStop(0, g1);
      grad.addColorStop(1, g2);
    }

    ctx.shadowBlur  = i === 0 ? 18 : 8;
    ctx.shadowColor = i === 0 ? '#00ff6a' : 'rgba(0,200,80,0.5)';

    roundRect(ctx, x+pad, y+pad, CELL-pad*2, CELL-pad*2, r, grad);

    // Head eyes
    if (i === 0) {
      ctx.shadowBlur = 0;
      ctx.fillStyle  = '#020d06';
      const ex = dir.x, ey = dir.y;
      const ox = ey * CELL * 0.18, oy = -ex * CELL * 0.18;
      const ew  = CELL * 0.15, eh = CELL * 0.15;
      const ecx = x + CELL/2 + dir.x*CELL*0.2;
      const ecy = y + CELL/2 + dir.y*CELL*0.2;
      ctx.beginPath(); ctx.ellipse(ecx+ox, ecy+oy, ew, eh, 0, 0, Math.PI*2); ctx.fill();
      ctx.beginPath(); ctx.ellipse(ecx-ox, ecy-oy, ew, eh, 0, 0, Math.PI*2); ctx.fill();
    }

    // Glossy sheen on body
    const sheen = ctx.createLinearGradient(x, y, x, y+CELL*0.55);
    sheen.addColorStop(0, 'rgba(255,255,255,0.14)');
    sheen.addColorStop(1, 'rgba(255,255,255,0)');
    ctx.shadowBlur = 0;
    roundRect(ctx, x+pad, y+pad, CELL-pad*2, CELL*0.45, r, sheen);
  });
  ctx.shadowBlur = 0;
}

function drawApple() {
  const pulse = 0.85 + 0.15 * Math.sin(Date.now() / 220);
  const cx = apple.x * CELL + CELL/2;
  const cy = apple.y * CELL + CELL/2;
  const rad = CELL * 0.38 * pulse;

  // Outer glow
  ctx.shadowBlur  = 20;
  ctx.shadowColor = '#ff2d55';
  const grad = ctx.createRadialGradient(cx - rad*0.25, cy - rad*0.25, 0, cx, cy, rad);
  grad.addColorStop(0, '#ff7094');
  grad.addColorStop(0.5, '#ff2d55');
  grad.addColorStop(1,   '#8b001c');
  ctx.beginPath();
  ctx.arc(cx, cy, rad, 0, Math.PI*2);
  ctx.fillStyle = grad;
  ctx.fill();

  // Stem
  ctx.shadowBlur = 0;
  ctx.strokeStyle = '#2d8a3e';
  ctx.lineWidth   = 1.5;
  ctx.beginPath();
  ctx.moveTo(cx, cy - rad);
  ctx.quadraticCurveTo(cx + rad*0.4, cy - rad*1.3, cx + rad*0.2, cy - rad*1.5);
  ctx.stroke();

  // Gloss
  ctx.beginPath();
  ctx.ellipse(cx - rad*0.25, cy - rad*0.28, rad*0.28, rad*0.18, -0.6, 0, Math.PI*2);
  ctx.fillStyle = 'rgba(255,255,255,0.32)';
  ctx.fill();
  ctx.shadowBlur = 0;
}

function roundRect(c, x, y, w, h, r, fill) {
  c.beginPath();
  c.moveTo(x+r, y);
  c.lineTo(x+w-r, y);
  c.quadraticCurveTo(x+w, y, x+w, y+r);
  c.lineTo(x+w, y+h-r);
  c.quadraticCurveTo(x+w, y+h, x+w-r, y+h);
  c.lineTo(x+r, y+h);
  c.quadraticCurveTo(x, y+h, x, y+h-r);
  c.lineTo(x, y+r);
  c.quadraticCurveTo(x, y, x+r, y);
  c.closePath();
  c.fillStyle = fill;
  c.fill();
}

function drawGame() {
  ctx.clearRect(0, 0, canvas.width, canvas.height);

  // Background
  const bg = ctx.createRadialGradient(canvas.width/2, canvas.height/2, 0, canvas.width/2, canvas.height/2, canvas.width*0.75);
  bg.addColorStop(0, '#010f05');
  bg.addColorStop(1, '#000801');
  ctx.fillStyle = bg;
  ctx.fillRect(0, 0, canvas.width, canvas.height);

  drawGrid();
  drawApple();
  drawSnake();
  updateParticles();
}

/* ═══════════════════════════════════════
   GAME LOOP
═══════════════════════════════════════ */
function tick(ts) {
  if (!running || paused || gameOver) return;
  animId = requestAnimationFrame(tick);

  const elapsed = ts - lastTime;
  if (elapsed < 1000 / getFPS()) return;
  lastTime = ts;

  // Move
  dir = {...nextDir};
  const head = {x: snake[0].x + dir.x, y: snake[0].y + dir.y};

  // Wall collision
  if (head.x < 0 || head.x >= GRID || head.y < 0 || head.y >= GRID) {
    return endGame();
  }
  // Self collision
  if (snake.some(s => s.x === head.x && s.y === head.y)) return endGame();

  snake.unshift(head);

  // Eat apple?
  if (head.x === apple.x && head.y === apple.y) {
    score++;
    if (score > highScore) { highScore = score; saveHigh(); }
    eatSound();
    spawnParticles(apple.x*CELL + CELL/2, apple.y*CELL + CELL/2, '#ff2d55');
    spawnParticles(apple.x*CELL + CELL/2, apple.y*CELL + CELL/2, '#00ff6a', 8);
    spawnApple();
    updateHud();
    updateSpeedBar();
  } else {
    snake.pop();
  }

  drawGame();
}

function startLoop() {
  cancelAnimationFrame(animId);
  running  = true;
  lastTime = performance.now();
  animId   = requestAnimationFrame(tick);
}

function endGame() {
  running = false; gameOver = true;
  gameOverSound();
  spawnParticles(snake[0].x*CELL+CELL/2, snake[0].y*CELL+CELL/2, '#ff2d55', 30);
  spawnParticles(snake[0].x*CELL+CELL/2, snake[0].y*CELL+CELL/2, '#ffcc00', 20);

  // Flash
  let flashes = 0;
  const fl = setInterval(() => {
    ctx.fillStyle = `rgba(255,45,85,${0.12 - flashes*0.02})`;
    ctx.fillRect(0,0,canvas.width,canvas.height);
    if (++flashes >= 5) clearInterval(fl);
  }, 60);

  setTimeout(() => {
    document.getElementById('finalScore').textContent = score;
    document.getElementById('hiLabel').textContent =
      score >= highScore && score > 0 ? '🏆 NEW HIGH SCORE!' : `BEST: ${highScore}`;
    show('gameOverScreen');
  }, 350);
}

/* ═══════════════════════════════════════
   SCREENS
═══════════════════════════════════════ */
function show(id) {
  ['startScreen','pauseScreen','gameOverScreen'].forEach(s => {
    document.getElementById(s).classList.toggle('hidden', s !== id);
  });
}
function hideAll() {
  ['startScreen','pauseScreen','gameOverScreen'].forEach(s =>
    document.getElementById(s).classList.add('hidden'));
}

/* ═══════════════════════════════════════
   CONTROLS
═══════════════════════════════════════ */
const KEY_MAP = {
  ArrowUp:    {x:0,y:-1}, ArrowDown:  {x:0,y:1},
  ArrowLeft:  {x:-1,y:0}, ArrowRight: {x:1,y:0},
  w: {x:0,y:-1}, s: {x:0,y:1}, a: {x:-1,y:0}, d: {x:1,y:0},
  W: {x:0,y:-1}, S: {x:0,y:1}, A: {x:-1,y:0}, D: {x:1,y:0},
};

document.addEventListener('keydown', e => {
  if (e.key === 'p' || e.key === 'P') { togglePause(); return; }
  if (!running || paused || gameOver) return;
  const nd = KEY_MAP[e.key];
  if (!nd) return;
  // Prevent reversing
  if (nd.x !== -dir.x || nd.y !== -dir.y) nextDir = nd;
  e.preventDefault();
});

function togglePause() {
  if (!running && !paused) return;
  if (gameOver) return;
  paused = !paused;
  document.getElementById('pauseBtn').textContent = paused ? '▶' : '⏸';
  pauseSound();
  if (paused) {
    cancelAnimationFrame(animId);
    show('pauseScreen');
  } else {
    hideAll();
    lastTime = performance.now();
    animId = requestAnimationFrame(tick);
  }
}

document.getElementById('pauseBtn').addEventListener('click', togglePause);
document.getElementById('startBtn').addEventListener('click', () => {
  resetGame(); hideAll(); startLoop();
});
document.getElementById('resumeBtn').addEventListener('click', () => {
  paused = false;
  document.getElementById('pauseBtn').textContent = '⏸';
  hideAll();
  lastTime = performance.now();
  animId = requestAnimationFrame(tick);
});
document.getElementById('replayBtn').addEventListener('click', () => {
  resetGame(); hideAll(); startLoop();
});
document.getElementById('fsBtn').addEventListener('click', () => {
  if (!document.fullscreenElement) document.documentElement.requestFullscreen().catch(()=>{});
  else document.exitFullscreen();
});

/* ── D-PAD ── */
function dpadDir(d) {
  if (!running || paused || gameOver) return;
  if (d.x !== -dir.x || d.y !== -dir.y) nextDir = d;
}
document.getElementById('dpUp').addEventListener('click',    () => dpadDir({x:0,y:-1}));
document.getElementById('dpDown').addEventListener('click',  () => dpadDir({x:0,y:1}));
document.getElementById('dpLeft').addEventListener('click',  () => dpadDir({x:-1,y:0}));
document.getElementById('dpRight').addEventListener('click', () => dpadDir({x:1,y:0}));

/* ── SWIPE ── */
let touchStart = null;
canvas.addEventListener('touchstart', e => {
  touchStart = {x: e.touches[0].clientX, y: e.touches[0].clientY};
  e.preventDefault();
}, {passive: false});
canvas.addEventListener('touchend', e => {
  if (!touchStart) return;
  const dx = e.changedTouches[0].clientX - touchStart.x;
  const dy = e.changedTouches[0].clientY - touchStart.y;
  if (Math.abs(dx) < 10 && Math.abs(dy) < 10) return;
  if (Math.abs(dx) > Math.abs(dy)) dpadDir({x: dx > 0 ? 1 : -1, y: 0});
  else                              dpadDir({x: 0, y: dy > 0 ? 1 : -1});
  touchStart = null;
  e.preventDefault();
}, {passive: false});

/* ═══════════════════════════════════════
   IDLE ANIMATION (pre-start)
═══════════════════════════════════════ */
function idleLoop() {
  if (running) return;
  drawGame();
  requestAnimationFrame(idleLoop);
}

/* ═══════════════════════════════════════
   INIT
═══════════════════════════════════════ */
resetGame();
show('startScreen');
idleLoop();

})();
</script>
</body>
</html>