body {
    margin: 0;
    height: 100vh;
    background: #111;
    font-family: Arial, Helvetica, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    color: #eee;
}

#game-container {
    display: flex;
    gap: 20px;
    align-items: flex-start;
}

#main {
    text-align: center;
}

canvas {
    image-rendering: pixelated;
    background: #000;
    border: 2px solid #444;
    box-shadow: 0 0 30px #0af3;
} 

#side {
    width: 120px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

#next-piece {
    background: #000;
    border: 2px solid #444;
    image-rendering: pixelated;
}

h1 {
    margin: 0 0 12px 0;
    font-size: 2.4rem;
    color: #0ff;
    text-shadow: 0 0 10px #0ff;
}

.info {
    font-size: 1.1rem;
    margin: 8px 0;
}

button {
    padding: 10px 40px;
    min-width: 310px;
    font-size: 1.1rem;
    background: #c00;
    color: #ff0;
    border: 0px solid #111;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s;
}

button:hover {
    color: #fff;
    background-color: #00AD00;
    border: 0px solid #111;
    transform: scale(1.05);
}

#game-over {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(0, 0, 0, 0.85);
    padding: 20px 30px;
    border: 4px solid #fff;
    border-radius: 12px;
    text-align: center;
    display: none;
    box-shadow: 0 0 40px #fff;
}

#game-over h2 {
    color: #FF4747;
    margin: 0 0 20px;
    font-size: 3rem;
}

.yellow {
    color: yellow;
}

/* ----------------------------------------------------------------------------
   Smartphones portrait (˜ 320–414 px)
   Principalement iPhone 12/13/14/SE, Galaxy S-series, etc.
---------------------------------------------------------------------------- */

@media screen and (max-width: 420px) {

  body {
    align-items: flex-start;
    padding-top: 8px;
  }

  #game-container {
    flex-direction: column;
    gap: 10px;
    align-items: center;
  }

  #main {
    width: 100%;
    max-width: 380px;
    margin-top: 15px;
  }

  #side {

  }

/*
  #side {
    width: auto;
    align-items: center;
    gap: 12px;
  }
*/

  canvas#board {
    width: 300px;          /* ou 320px si tu préfères un peu plus grand */
    height: 455px;         /* garde le ratio 1:2 classique */
    max-width: 92vw;       /* évite de dépasser l'écran */
  }

  canvas#next {
    width: 96px;
    height: 96px;
  }

  .info {
    font-size: 1.3rem;
    margin: 12px 0;
  }

  button {
    padding: 4px 10px;
    font-size: 1.3rem;
    min-width: 260px;
    touch-action: manipulation;   /* meilleur feeling tactile */
    margin-top: -15px;
  }

  #game-over {
    padding: 30px 10px;
    width: 86vw;
    max-width: 300px;
  }

  #game-over h2 {
    font-size: 2.4rem;
  }

  #game-over .info {
    font-size: 1.4rem;
  }
}


/* Très petits écrans (= 360 px) ? iPhone SE 1re gen, vieilles Android */
@media screen and (max-width: 360px) {

  canvas#board {
    width: 260px;
    height: 450px;          /* on réduit un peu la hauteur aussi */
  }

  canvas#next {
    width: 80px;
    height: 80px;
  }

  button {
    padding: 4px 10px;
    font-size: 1.25rem;
    min-width: 200px;
  }

  .info {
    font-size: 1.15rem;
  }

  #game-over {
    padding: 24px 30px;
  }

  #game-over h2 {
    font-size: 2.1rem;
  }

  #side {
      display: none;
  }

}