body {
    margin: 0;
    padding: 0;
    background: linear-gradient(to bottom, #232526, #414345);
    height: 100vh;
    overflow: hidden;
    font-family: 'Segoe UI', Arial, sans-serif;
    transition: background 0.5s;
    padding-bottom: env(safe-area-inset-bottom); 
    
}
html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  overflow: hidden;
  background-color: #111; /* Match your game's background */
}


#game-container {
    position: relative;
    width: 100vw;
    height: 100vh;
}

#gameCanvas {
    display: block;
    margin: 0 auto;
    background: transparent;
    width: 100vw;
    height: 100vh;
}

#game-over {
    position: absolute;
    top: 40%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(30, 30, 30, 0.95);
    color: #fff;
    padding: 2rem 3rem;
    border-radius: 1rem;
    text-align: center;
    z-index: 10;
    box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.37);
}

#game-over.hidden {
    display: none;
}

#restart-btn {
    margin-top: 1rem;
    padding: 0.7rem 2rem;
    font-size: 1.2rem;
    border: none;
    border-radius: 0.5rem;
    background: #ff4e50;
    color: #fff;
    cursor: pointer;
    transition: background 0.3s;
}
#restart-btn:hover {
    background: #fc913a;
}

#dark-mode-toggle {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: #232526;
    color: #fff;
    border: none;
    border-radius: 50%;
    width: 2.5rem;
    height: 2.5rem;
    font-size: 1.5rem;
    cursor: pointer;
    z-index: 20;
    box-shadow: 0 2px 8px rgba(0,0,0,0.2);
    transition: background 0.3s;
}
#dark-mode-toggle:hover {
    background: #414345;
}

body.dark-mode {
    background: linear-gradient(to bottom, #0f2027, #2c5364);
}

body.dark-mode #game-over {
    background: rgba(10, 10, 10, 0.97);
    color: #eee;
}
body.dark-mode #restart-btn {
    background: #222;
    color: #ff4e50;
}
body.dark-mode #restart-btn:hover {
    background: #444;
}
body.dark-mode #dark-mode-toggle {
    background: #111;
    color: #ff4e50;
}

#start-btn {
    position: absolute;
    top: 35%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 15;
    padding: 1.2rem 3rem;
    font-size: 2rem;
    background: #2ecc40;
    color: #fff;
    border: none;
    border-radius: 1rem;
    box-shadow: 0 4px 16px rgba(0,0,0,0.2);
    cursor: pointer;
    transition: background 0.3s;
}
#start-btn:hover {
    background: #27ae60;
}
#start-btn.hidden {
    display: none;
}

#flap-btn {
    position: absolute;
    left: 50%;
    bottom: 5.5rem;
    margin-bottom: 0.5rem;
    transform: translateX(-50%);
    z-index: 20;
    padding: 1.2rem 3.5rem;
    font-size: 2rem;
    background: #ff4e50;
    color: #fff;
    border: none;
    border-radius: 2rem;
    box-shadow: 0 4px 16px rgba(0,0,0,0.18);
    cursor: pointer;
    transition: background 0.3s;
    display: none;
    /* padding-bottom: env(safe-area-inset-bottom);  */
}
#flap-btn:active {
    background: #fc913a;
}
@media (max-width: 700px) {
    #flap-btn {
        display: block;
    }
}