:root {
  color-scheme: light;
  --bg: #f7f7f9;
  --surface: #ffffff;
  --surface-strong: #eef0f4;
  --text: #1b1b1f;
  --muted: #5f5f6b;
  --border: #d7d7df;
  --accent: #1f6feb;
  --accent-contrast: #ffffff;
  --shadow: 0 10px 30px rgba(27, 27, 31, 0.08);
}

body.dark {
  color-scheme: dark;
  --bg: #0f1115;
  --surface: #171a21;
  --surface-strong: #202530;
  --text: #e8eaf0;
  --muted: #a3a8b8;
  --border: #303545;
  --accent: #7db3ff;
  --accent-contrast: #10131a;
  --shadow: 0 14px 36px rgba(0, 0, 0, 0.35);
}

body {
  margin: 0;
  padding: 24px;
  background: var(--bg);
  color: var(--text);
  font-family: sans-serif;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.appShell {
  max-width: 920px;
  margin: 0 auto;
}

.topBar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

h1 {
  margin: 0;
}

p {
  color: var(--muted);
}

button,
input,
select {
  font: inherit;
}

.themeButton,
#export,
#copyButton {
  border-radius: 10px;
  cursor: pointer;
}

.themeButton {
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  padding: 8px 12px;
  box-shadow: var(--shadow);
}

.themeButton:hover {
  border-color: var(--accent);
}

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px;
  box-shadow: var(--shadow);
}

#log,
#arduinoCode {
  white-space: pre-line;
  background: var(--surface-strong);
  color: var(--text);
}

#log {
  min-height: 120px;
  padding: 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
}

#exportContainer {
  margin-top: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.controlsRow {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  align-items: center;
}

#export {
  background: var(--accent);
  color: var(--accent-contrast);
  border: none;
  padding: 10px 14px;
}

#customText,
#customDelayName,
#offsetSign {
  width: 100%;
  box-sizing: border-box;
  margin-left: 0;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
  color: var(--text);
}

#offsetContainer,
#optionsContainer {
  margin-top: 0;
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

#copyButton {
  display: none;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  padding: 10px 14px;
}

#arduinoCode {
  margin-top: 20px;
  padding: 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
}