* {
  box-sizing: border-box;
}

:root {
  --spacing: max(1em, 5vmin);
  --bg-color: #f6f5f4;
  --text-color: #191918;
  --daylight-bg: #f6f5f4;
  --daylight-text: #191918;
  --golden-bg: #ffa07a;
  --golden-text: #3d1f0f;
  --twilight-bg: #1e3a5f;
  --twilight-text: #e8f2ff;
  --blue-hour-bg: #0f1e2e;
  --blue-hour-text: #f0f6ff;
  --night-bg: #232322;
  --night-text: #f6f5f4;
}

html, body {
  overflow: hidden;
}

body {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: var(--spacing);
  height: 100vh;
  margin: 0;
  padding: var(--spacing);
  color: var(--text-color);
  background-color: var(--bg-color);
  transition: background-color .3s ease-in-out, color 1s ease-in-out;
  text-align: center;
  font-family: 'Inter', system-ui, sans-serif;
  font-optical-sizing: auto;
  letter-spacing: -0.02em;
  cursor: default;
}

#clock {
  width: 100%;
  flex-shrink: 1;
  touch-action: none;
  pointer-events: auto;
}

#clock * {
  cursor: grab;
}

#clock:active *,
#clock.dragging {
  cursor: grabbing;
}

#instruction {
  margin: 0;
  padding: 0;
}

#timestamp-date {
  border: .125em solid;
  padding: 0.2em 0.25em;
  border-radius: 0.5em;
}

#timestamp-time {
  font-size: smaller;
  font-variant-numeric: tabular-nums;
  cursor: text;
  opacity: 0.75;
}

#instruction,
footer {
  font-size: var(--spacing);
  text-box-trim: trim-both;
  text-wrap: balance;
}

footer {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.1em;
}

#reset-btn,
#info-btn {
  background: none;
  border: none;
  font-size: smaller;
  cursor: pointer;
  padding: 0.2em;
  line-height: 1;
  opacity: 0.6;
  transition: opacity 0.2s;
}

#reset-btn:hover,
#info-btn:hover {
  opacity: 1;
}

#reset-btn:active,
#info-btn:active {
  transform: scale(0.9);
}

#reset-btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

dialog {
  border: 0.125em solid var(--text-color);
  border-radius: 1em;
  padding: 2em;
  background: var(--bg-color);
  color: var(--text-color);
}

dialog h2 {
  margin-top: 0;
  padding-top: 0;
}

dialog a {
  color: var(--text-color);
}

.blink {
  animation: blink 2s step-end infinite;
}

@keyframes blink {
  50% {
    opacity: 0;
  }
}