@charset "UTF-8";

html {
  touch-action: manipulation;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, sans-serif;
  line-height: 1.6;
  color: #172b4d;
  background-color: #edf5ff;
}

#contents {
  max-width: 540px;
  margin: 0 auto;
  background-color: #ffffff;
}

.page-header {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 12px;
  align-items: baseline;
  justify-content: center;
  padding: 10px;
  background-color: #c0cbff;
}

h1 {
  margin: 0;
  font-size: 1.3rem;
  color: #000055;
}

#version-info {
  font-size: 0.8rem;
  color: #425479;
}

#main {
  padding: 12px 16px 16px;
}

.intro {
  margin: 0 0 16px;
  font-size: 0.9rem;
  text-align: center;
}

button {
  min-width: 44px;
  min-height: 44px;
  padding: 8px 12px;
  font: inherit;
  font-weight: 600;
  color: #214b8b;
  cursor: pointer;
  background-color: #edf4ff;
  border: 1px solid #b7ccec;
  border-radius: 8px;
}

button:disabled {
  color: #68758b;
  cursor: default;
  background-color: #f1f3f7;
  border-color: #dce2ec;
}

button.primary {
  color: #ffffff;
  background-color: #245abb;
  border-color: #245abb;
}

@media (hover: hover) {
  button:hover:not(:disabled) {
    filter: brightness(0.94);
  }
}

.settings,
.disk-controls,
.progress-heading {
  display: flex;
  gap: 8px;
  align-items: center;
  justify-content: space-between;
}

.settings,
.progress-heading {
  flex-wrap: wrap;
}

.disk-controls {
  gap: 10px;
}

.disk-controls button {
  padding: 6px;
  font-size: 1.1rem;
}

#disk-count {
  display: inline-block;
  min-width: 1.5em;
  text-align: center;
}

#svg-board {
  display: block;
  width: 100%;
  height: auto;
  margin: 24px 0 16px;
  user-select: none;
}

#svg-board text {
  font-size: 14px;
  fill: #425479;
}

#step-info {
  margin-left: 6px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

#speed-info {
  font-size: 0.85rem;
  color: #425479;
}

#step-range {
  display: block;
  width: 100%;
  height: 36px;
  margin: 4px 0 0;
  accent-color: #245abb;
  cursor: pointer;
}

#move-info {
  min-height: 1.6em;
  margin: 0 0 16px;
  font-size: 0.9rem;
  text-align: center;
}

.playback-controls,
.step-controls {
  display: grid;
  gap: 8px;
}

.playback-controls {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.step-controls {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 8px;
}

.hint {
  margin: 12px 0 0;
  font-size: 0.8rem;
  color: #52617b;
}

.help {
  padding: 0 16px 16px;
  font-size: 0.9rem;
}

summary {
  padding: 10px 0;
  font-weight: 600;
  color: #214b8b;
  cursor: pointer;
  border-top: 1px solid #dce5f2;
}

button:focus-visible,
input:focus-visible,
summary:focus-visible {
  outline: 3px solid #245abb;
  outline-offset: 3px;
}

.help p {
  margin: 10px 0;
}

table {
  width: 100%;
  border-collapse: collapse;
}

caption {
  margin: 8px 0;
  font-weight: 600;
  text-align: left;
}

th,
td {
  padding: 6px 10px;
  text-align: left;
  border: 1px solid #c4d4ee;
}

th {
  background-color: #e6eeff;
}

@media (width <= 360px) {
  #main,
  .help {
    padding-right: 10px;
    padding-left: 10px;
  }

  button {
    padding-right: 8px;
    padding-left: 8px;
  }
}