:root {
  color-scheme: dark;
  font-family:
    Inter, "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif;
  background: #0d0f17;
  color: #f6f7fb;
  font-synthesis: none;
}

* {
  box-sizing: border-box;
}

body {
  min-height: 100vh;
  margin: 0;
  display: grid;
  place-items: center;
  padding: 24px;
  background:
    radial-gradient(circle at 15% 20%, rgba(130, 87, 255, 0.22), transparent 30%),
    radial-gradient(circle at 85% 80%, rgba(44, 204, 181, 0.15), transparent 30%),
    #0d0f17;
}

button,
input {
  font: inherit;
}

button {
  cursor: pointer;
}

.timer-card {
  width: min(100%, 560px);
  padding: clamp(28px, 6vw, 56px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 32px;
  background: rgba(23, 25, 35, 0.86);
  box-shadow: 0 32px 100px rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(18px);
}

.eyebrow {
  color: #9b83ff;
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.2em;
}

h1 {
  margin: 12px 0 36px;
  font-size: clamp(1.55rem, 5vw, 2.35rem);
  line-height: 1.35;
  letter-spacing: -0.035em;
}

.time-display {
  font-variant-numeric: tabular-nums;
  font-size: clamp(4.5rem, 19vw, 7.25rem);
  font-weight: 750;
  line-height: 0.9;
  letter-spacing: -0.07em;
  text-align: center;
  text-shadow: 0 0 45px rgba(155, 131, 255, 0.18);
}

.status {
  min-height: 1.5em;
  margin: 20px 0 26px;
  color: #aeb1c0;
  text-align: center;
}

.presets {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
}

.preset,
.secondary {
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: #d8d9e2;
  background: rgba(255, 255, 255, 0.045);
}

.preset {
  min-height: 46px;
  border-radius: 14px;
}

.preset:hover,
.preset:focus-visible,
.preset.is-active {
  border-color: #9b83ff;
  color: #fff;
  background: rgba(155, 131, 255, 0.17);
}

.custom-time {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin: 22px 0;
  color: #c9cad3;
}

.input-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
}

input {
  width: 78px;
  padding: 11px 12px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 12px;
  outline: none;
  color: #fff;
  background: #10121a;
}

input:focus {
  border-color: #9b83ff;
  box-shadow: 0 0 0 3px rgba(155, 131, 255, 0.16);
}

.controls {
  display: grid;
  grid-template-columns: 1.6fr 1fr;
  gap: 10px;
}

.controls button {
  min-height: 54px;
  border-radius: 16px;
  font-weight: 750;
}

.primary {
  border: 0;
  color: #0e0f17;
  background: linear-gradient(135deg, #b4a3ff, #75e0ce);
  box-shadow: 0 10px 28px rgba(117, 224, 206, 0.15);
}

.primary:hover {
  filter: brightness(1.07);
}

.secondary:hover {
  background: rgba(255, 255, 255, 0.09);
}

.hint {
  margin: 26px 0 0;
  color: #6f7281;
  font-size: 0.78rem;
  text-align: center;
}

button:focus-visible {
  outline: 3px solid rgba(117, 224, 206, 0.55);
  outline-offset: 3px;
}

@media (max-width: 480px) {
  .timer-card {
    padding: 28px 20px;
    border-radius: 24px;
  }

  .presets {
    grid-template-columns: repeat(2, 1fr);
  }

  .hint {
    display: none;
  }
}

@media (prefers-reduced-motion: no-preference) {
  .primary,
  .preset,
  .secondary {
    transition: 160ms ease;
  }
}