:root {
  color-scheme: light;
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  color: #172033;
  background: #f3f6fb;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
}

.app {
  max-width: 1180px;
  margin: 0 auto;
  padding: 28px 20px 48px;
}

header {
  margin-bottom: 20px;
}

h1 {
  margin: 0 0 6px;
  font-size: clamp(1.7rem, 3vw, 2.4rem);
}

header p,
.muted,
.footnote {
  color: #617086;
}

.panel {
  padding: 18px;
  background: #fff;
  border: 1px solid #dce3ee;
  border-radius: 12px;
  box-shadow: 0 3px 12px #1720330a;
}

.controls {
  margin-bottom: 18px;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

button {
  padding: 11px 16px;
  border: 0;
  border-radius: 8px;
  background: #2459d3;
  color: #fff;
  font: inherit;
  font-weight: 650;
  cursor: pointer;
}

button:hover:not(:disabled) {
  background: #1948b6;
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

#status {
  margin: 14px 0 6px;
}

#sourceFiles {
  margin: 0 0 10px;
  overflow-wrap: anywhere;
}

.text-inputs {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 16px;
}

.text-field {
  display: grid;
  align-content: start;
  gap: 8px;
  min-width: 0;
}

.text-field label {
  font-weight: 650;
}

.text-field textarea {
  width: 100%;
  resize: vertical;
  border: 1px solid #cbd4e1;
  border-radius: 6px;
  padding: 10px;
  font: 0.9rem/1.45 ui-monospace, SFMono-Regular, Consolas, monospace;
}

#convertButton {
  justify-self: start;
  grid-column: 1 / -1;
}

details {
  margin-top: 14px;
  border-top: 1px solid #e7ebf2;
  padding-top: 12px;
}

summary {
  font-weight: 650;
  cursor: pointer;
}

.settings {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 12px;
  margin-top: 14px;
}

.settings label {
  display: grid;
  gap: 5px;
  font-size: 0.9rem;
}

.settings input {
  width: 100%;
  border: 1px solid #cbd4e1;
  border-radius: 6px;
  padding: 8px;
  font: inherit;
}

.layout {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(280px, 1fr);
  gap: 18px;
}

h2 {
  margin: 0 0 14px;
  font-size: 1.15rem;
}

#boardCanvas {
  display: block;
  width: 100%;
  height: 480px;
  border: 1px solid #dce3ee;
  border-radius: 8px;
  background: #fbfcff;
}

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 12px;
  color: #536176;
  font-size: 0.88rem;
}

.legend span {
  display: inline-flex;
  align-items: center;
  gap: 7px;
}

.legend i {
  display: inline-block;
  width: 16px;
  height: 4px;
}

.hole-key {
  background: #2459d3;
}

.path-key {
  background: #e45b37;
}

.gap-key {
  border: 1px dashed #e45b37;
  background: #fff;
}

#fileList {
  margin: 0;
  padding: 0;
  list-style: none;
}

#fileList li {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid #edf0f5;
  overflow-wrap: anywhere;
}

#fileList li:last-child {
  border-bottom: 0;
}

#fileList button {
  flex: 0 0 auto;
  padding: 7px 10px;
  font-size: 0.88rem;
}

#downloadAllButton {
  margin-top: 12px;
}

.footnote {
  margin-top: 16px;
  font-size: 0.88rem;
  line-height: 1.5;
}

@media (max-width: 760px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .text-inputs {
    grid-template-columns: 1fr;
  }

  #convertButton {
    grid-column: auto;
  }

  #boardCanvas {
    height: 360px;
  }
}

@media (max-width: 420px) {
  .app {
    padding: 18px 12px 32px;
  }

  .panel {
    padding: 14px;
  }

  #fileList li {
    align-items: flex-start;
    flex-direction: column;
  }
}