:root {
  color-scheme: light dark;
  --setup-bg: #f3f5f7;
  --setup-text: #111827;
  --rest-bg: #b0bec5;
  --prestart-bg: #455a64;
  --prestart-text: #fff;
  --card-bg: rgba(255, 255, 255, 0.92);
  --card-border: rgba(17, 24, 39, 0.12);
  --muted: #5b6472;
}

@media (prefers-color-scheme: dark) {
  :root {
    --setup-bg: #101418;
    --setup-text: #f5f7fa;
    --rest-bg: #37474f;
    --card-bg: rgba(20, 25, 31, 0.92);
    --card-border: rgba(245, 247, 250, 0.14);
    --muted: #a8b3c2;
  }
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

body {
  margin: 0;
  font-family: Arial, sans-serif;
}

#app {
  min-height: 100dvh;
  padding: 14px;
  color: var(--setup-text);
  background: var(--setup-bg);
}

#setup-screen {
  max-width: 820px;
  margin: 0 auto;
  display: grid;
  gap: 12px;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 18px;
  padding: 14px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
}

#setup-screen h1 {
  margin: 0 0 4px;
  font-size: 1.45rem;
}

#setup-screen label {
  font-size: 0.9rem;
  color: var(--muted);
}

#setup-screen input,
#setup-screen button {
  min-height: 44px;
  border-radius: 10px;
  border: 1px solid var(--card-border);
  padding: 0 12px;
  font-size: 1rem;
}

#setup-screen button {
  font-weight: 600;
}

#start-btn {
  background: #1f7a45;
  color: #fff;
  border-color: transparent;
}

#rounds-list {
  display: grid;
  gap: 10px;
}

.round-row {
  display: grid;
  grid-template-columns: 1fr 92px;
  gap: 8px;
  padding: 8px;
  background: rgba(127, 127, 127, 0.08);
  border-radius: 10px;
}

.delete-round-btn {
  grid-column: 1 / -1;
}

.delete-round-btn:disabled {
  opacity: 0.5;
}

#run-screen {
  position: relative;
  min-height: calc(100dvh - 28px);
  display: grid;
  align-content: center;
  justify-items: center;
  text-align: center;
  gap: 14px;
  padding: 8px;
}

.phase-label {
  margin: 0;
  font-weight: 700;
  letter-spacing: 0.06em;
}

#round-label {
  margin: 0;
  font-size: clamp(20px, 5vw, 34px);
  font-weight: 700;
  opacity: 0.95;
}

.timer-value {
  margin: 0;
  font-size: clamp(96px, 28vw, 280px);
  font-weight: 800;
  line-height: 0.9;
  letter-spacing: -0.03em;
}

#run-controls {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: center;
}

#run-controls button,
#paused-overlay button,
#complete-screen button {
  min-height: 46px;
  min-width: 92px;
  border-radius: 12px;
  border: none;
  padding: 0 14px;
  font-size: 1rem;
  font-weight: 600;
}

#paused-overlay {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  gap: 10px;
  background: rgba(0, 0, 0, 0.5);
  color: #fff;
  font-size: clamp(24px, 5vw, 48px);
  font-weight: 700;
}

#complete-screen {
  min-height: calc(100dvh - 28px);
  display: grid;
  place-items: center;
  gap: 14px;
  text-align: center;
  background: radial-gradient(circle at center, rgba(76, 175, 80, 0.2), transparent 60%);
}

#celebration-title {
  margin: 0;
  font-size: clamp(44px, 12vw, 110px);
  animation: pulse 1.2s ease-in-out infinite;
}

@keyframes pulse {
  0%,
  100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.08);
  }
}

#app[data-state="PRESTART"] {
  background: var(--prestart-bg);
  color: var(--prestart-text);
}

#app[data-state="REST"] {
  background: var(--rest-bg);
}

@media (min-width: 700px) {
  #app {
    padding: 20px;
  }

  .round-row {
    grid-template-columns: 1fr 120px auto;
    align-items: center;
  }

  .delete-round-btn {
    grid-column: auto;
  }
}