* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: #e7f2ef;
  color: #16352f;
  font-family: "Segoe UI", system-ui, sans-serif;
  line-height: 1.5;
}

.app {
  width: 390px;
  max-width: 100%;
  margin: 0 auto;
  padding: 3.5rem 1.75rem 4.5rem;
}

h1 {
  margin: 0;
  font-size: 1.75rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.intro {
  margin: 0.75rem 0 0;
}

.stage {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin: 3rem 0 2.5rem;
}

.circle {
  width: 9.5rem;
  height: 9.5rem;
  border-radius: 50%;
  background: #7dcec0;
  margin-bottom: 2rem;
}

.phase {
  margin: 0;
  font-size: 1rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.seconds {
  margin: 0.5rem 0 0;
  min-height: 6.5rem;
  font-size: 6.5rem;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  font-weight: 500;
}

.cycles {
  margin: 1.25rem 0 0;
}

.row {
  display: flex;
  gap: 0.75rem;
}

button {
  font: inherit;
  color: #16352f;
  background: transparent;
  border: 1px solid #16352f;
  border-radius: 999px;
  padding: 0.55rem 1.25rem;
  cursor: pointer;
}

#start {
  background: #7dcec0;
  border-color: #7dcec0;
}

button:focus-visible,
input:focus-visible {
  outline: 3px solid #16352f;
  outline-offset: 3px;
}

.error {
  min-height: 1.5rem;
  margin: 1rem 0 0;
}

.fields {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem 1.25rem;
  margin-top: 2.5rem;
}

label {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  font-size: 0.95rem;
}

input {
  font: inherit;
  color: #16352f;
  width: 100%;
  background: transparent;
  border: none;
  border-bottom: 1px solid #16352f;
  border-radius: 0;
  padding: 0.4rem 0;
}

.presets {
  margin-top: 2rem;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }
}