* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg: #2E3440;
  --panel: #3B4252;
  --wave: #81A1C1;
  --beat: #8FBCBB;
  --current-line: #A3BE8C;
  --warning: #BF616A;
  --text: #D8DEE9;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", "Hiragino Kaku Gothic ProN", sans-serif;
  height: 100vh;
  overflow: hidden;
}

#app {
  display: flex;
  flex-direction: column;
  height: 100%;
}

header {
  background: var(--panel);
  padding: 12px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

h1 {
  font-size: 18px;
  font-weight: 600;
}

.controls {
  display: flex;
  gap: 8px;
}

button, select {
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--wave);
  border-radius: 4px;
  padding: 6px 12px;
  cursor: pointer;
  font-size: 13px;
}

button:hover, select:hover {
  background: var(--wave);
  color: var(--bg);
}

main {
  flex: 1;
  display: flex;
  overflow: hidden;
}

#lyrics-panel {
  width: 320px;
  background: var(--panel);
  padding: 12px;
  display: flex;
  flex-direction: column;
}

#lyrics-input {
  flex: 1;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--wave);
  border-radius: 4px;
  padding: 8px;
  font-size: 14px;
  line-height: 1.8;
  resize: none;
}

#canvas-panel {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: 12px;
  gap: 8px;
}

#preview {
  flex: 1;
  background: var(--panel);
  border-radius: 4px;
  width: 100%;
}

#transport {
  display: flex;
  gap: 8px;
  align-items: center;
}

footer {
  background: var(--panel);
  padding: 8px 16px;
  font-size: 12px;
}

#status {
  color: var(--beat);
}