body {
  margin: 0;
  padding: 0;
  min-height: 100vh;
  font-family: 'Inter', Arial, sans-serif;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #e0ecef;
  overflow: hidden;
}
.background-vibe {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  z-index: 0;
  background: linear-gradient(270deg, #b7e0f7, #b9f7d1, #f7e0b7, #f7b7d1, #b7c7f7);
  background-size: 400% 400%;
  animation: gradientMove 18s ease-in-out infinite;
}

@keyframes gradientMove {
  0% { background-position: 0% 50%; }
  25% { background-position: 50% 100%; }
  50% { background-position: 100% 50%; }
  75% { background-position: 50% 0%; }
  100% { background-position: 0% 50%; }
}
.timer-card {
  position: relative;
  z-index: 1;
  background: rgba(255,255,255,0.7);
  box-shadow: 0 8px 32px 0 rgba(31,38,135,0.18);
  border-radius: 24px;
  padding: 2.5rem 2.5rem 2rem 2.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 340px;
  max-width: 90vw;
  backdrop-filter: blur(12px);
}
.timer-card h1 {
  font-size: 2.2rem;
  font-weight: 700;
  margin-bottom: 1.2rem;
  color: #234;
}
.timer-ring {
  margin-bottom: 1.2rem;
  transform: rotate(-90deg);
}
.ring-bg {
  fill: none;
  stroke: #e0e0e0;
  stroke-width: 14;
}
.ring-progress {
  fill: none;
  stroke: #4ecca3;
  stroke-width: 14;
  stroke-linecap: round;
  stroke-dasharray: 628.32;
  stroke-dashoffset: 0;
  transition: stroke-dashoffset 0.5s linear;
}
.timer-display {
  font-size: 4rem;
  font-weight: 600;
  color: #234;
  margin-bottom: 1.5rem;
  letter-spacing: 2px;
  text-align: center;
}
.button-row {
  display: flex;
  gap: 1.2rem;
}
button {
  padding: 0.7rem 2.1rem;
  font-size: 1.2rem;
  border: none;
  border-radius: 14px;
  background: rgba(255,255,255,0.8);
  box-shadow: 0 2px 8px rgba(31,38,135,0.08);
  color: #234;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.2s, box-shadow 0.2s;
}
button:hover {
  background: #e0ecef;
  box-shadow: 0 4px 16px rgba(31,38,135,0.12);
}
@media (max-width: 600px) {
  .timer-card {
    min-width: 90vw;
    padding: 1.2rem 0.5rem 1.2rem 0.5rem;
  }
  .timer-display {
    font-size: 2.5rem;
  }
  .button-row button {
    font-size: 1rem;
    padding: 0.6rem 1.2rem;
  }
}
#center-play-pause {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 64px;
  height: 64px;
  border: none;
  background: transparent;
  box-shadow: none;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 2;
  outline: none;
  padding: 0;
  transition: filter 0.2s, transform 0.2s;
}
#center-play-pause:hover svg {
  filter: brightness(0.7);
  transform: scale(1.08);
}
#center-play-pause svg {
  width: 48px;
  height: 48px;
  fill: #234;
  transition: filter 0.2s, transform 0.2s;
}