:root {
  --bg: linear-gradient(135deg, #ffdee9, #b5fffc);
  --text: #ff6f61;
  --cake: #fff5e1;
  --candle: #ffd700;
  --flame: #ffb703;
}

body {
  margin: 0;
  background: var(--bg);
  min-height: 100vh;
  font-family: 'Segoe UI', sans-serif;
  overflow: hidden;
  transition: all 0.4s ease-in-out;
}

body.dark {
  --bg: linear-gradient(135deg, #222, #3a3a3a);
  --text: #ffe7d6;
  --cake: #2d2d2d;
  --candle: #ffa500;
  --flame: #eb5e28;
}

#darkModeToggle, #musicToggle {
  position: absolute;
  top: 1em;
  background: none;
  border: none;
  font-size: 1.75em;
  cursor: pointer;
  z-index: 1000;
  transition: transform 0.3s ease;
}
#darkModeToggle { right: 1em; }
#musicToggle { left: 1em; }

#darkModeToggle:hover,
#musicToggle:hover {
  transform: scale(1.1);
}

.container {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
}

.balloons {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 60vh;
  pointer-events: none;
  z-index: 0;
}

h1 {
  font-family: 'Pacifico', cursive;
  font-size: 2.5em;
  color: var(--text);
  text-shadow: 2px 2px 8px #fff, 0 0 3px #ff6f61;
  min-height: 1.4em;
  transition: color 0.4s;
}

#nameInput {
  margin-top: 1em;
  padding: 0.75em;
  font-size: 1em;
  border-radius: 15px;
  border: 1px solid #eee;
  box-shadow: 0 2px 8px #fff5e1;
  width: 240px;
}

#wishBtn {
  padding: 1em 2em;
  background: #fff500;
  color: #222;
  border: none;
  font-size: 1.25em;
  border-radius: 30px;
  margin-left: 1em;
  margin-top: 1em;
  transition: background 0.3s, transform 0.2s;
  cursor: pointer;
  font-weight: bold;
  box-shadow: 0 4px 24px rgba(255, 223, 39, 0.15);
}
#wishBtn:hover { background: #ffd600; transform: scale(1.05); }

.cake {
  margin: 2em auto 1.5em auto;
  width: 160px;
  height: 120px;
  position: relative;
}
.cake-body {
  width: 100%;
  height: 70px;
  background: var(--cake);
  border-radius: 0 0 80px 80px;
  position: absolute;
  bottom: 0;
  box-shadow: 0 10px 20px #adadad77;
}
.candles {
  display: flex;
  justify-content: center;
  gap: 12px;
  position: absolute;
  top: 30px;
  width: 100%;
}
.candles .flame {
  width: 8px; height: 18px;
  background: var(--flame);
  border-radius: 50% 50% 60% 60%;
  animation: flame-flicker 1s infinite alternate;
  box-shadow: 0 0 12px rgba(255, 183, 3, 0.5);
}
@keyframes flame-flicker {
  0% { filter: blur(1px) brightness(1); transform: translateY(0); }
  100% { filter: blur(2px) brightness(1.6); transform: translateY(-3px); }
}

#confetti {
  position: fixed;
  pointer-events: none;
  top: 0; left: 0;
  width: 100vw; height: 100vh;
  z-index: 20;
}

@media (max-width: 600px) {
  .container {
    width: 90%;
  }
  h1 {
    font-size: 2em;
  }
  #wishBtn {
    width: 100%;
    margin-left: 0;
    margin-top: 1em;
  }
}