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

button,
select,
input {
  font-family: inherit;
}

/* --- Theme variables --- */
:root {
  --bg: #1a1a2e;
  --text: #e0e0e0;
  --text-muted: #888;
  --text-dim: #555;
  --control-bg: #16213e;
  --control-border: #333;
  --fret-border: #444;
  --nut-border: #ccc;
  --string-color: #aaa;
  --note-bg: #2a2a4a;
  --note-color: #888;
  --scale-bg: #5E6781;
  --scale-color: #e0e0e0;
  --scale-shadow: rgba(15, 52, 96, 0.5);
  --root-bg: #C87C68;
  --root-color: #fff;
  --root-shadow: rgba(200, 124, 104, 0.6);
  --dot-color: #333;
  --toggle-bg: #16213e;
  --toggle-color: #e0e0e0;
  --toggle-border: #444;
}

body.light {
  --bg: #f5f5f5;
  --text: #222;
  --text-muted: #666;
  --text-dim: #999;
  --control-bg: #fff;
  --control-border: #ccc;
  --fret-border: #bbb;
  --nut-border: #444;
  --string-color: #777;
  --note-bg: #ddd;
  --note-color: #999;
  --scale-bg: #5E6781;
  --scale-color: #fff;
  --scale-shadow: rgba(74, 144, 217, 0.4);
  --root-bg: #C87C68;
  --root-color: #fff;
  --root-shadow: rgba(200, 124, 104, 0.5);
  --dot-color: #ccc;
  --toggle-bg: #fff;
  --toggle-color: #222;
  --toggle-border: #ccc;
}

/* --- Layout --- */
body {
  font-family: "SF Pro", "Arial Unicode MS", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  padding: 2rem;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  transition: background 0.2s, color 0.2s;
}

.header {
  display: flex;
  justify-content: center;
  align-items: center;
  margin-bottom: 1.5rem;
  position: relative;
}

h1 {
  font-size: 1.4rem;
  letter-spacing: 0.05em;
}

/* --- Theme toggle button --- */
#theme-toggle {
  position: absolute;
  right: 0;
  padding: 0.35rem 0.75rem;
  border-radius: 4px;
  border: 1px solid var(--toggle-border);
  background: var(--toggle-bg);
  color: var(--toggle-color);
  font-size: 0.8rem;
  cursor: pointer;
  transition: background 0.2s, color 0.2s, border-color 0.2s;
}

/* --- Accidental toggle button --- */
#accidental-toggle {
  width: 2rem;
  height: 2rem;
  padding: 0;
  border-radius: 4px;
  border: 1px solid var(--control-border);
  background: var(--control-bg);
  color: var(--text);
  font-size: 1.15rem;
  cursor: pointer;
  align-self: flex-end;
  transition: background 0.2s, color 0.2s, border-color 0.2s;
}

#accidental-toggle:active,
#accidental-toggle:focus {
  outline: none;
  border-color: var(--control-border);
}

/* --- Controls --- */
.controls {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  margin-bottom: 2rem;
}

.controls-row {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  flex-wrap: wrap;
  align-items: flex-end;
}

.controls-tunings {
  gap: 0.5rem;
  align-items: flex-end;
}

.controls label {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

.controls-tunings label {
  font-size: 0.65rem;
}

.controls select {
  padding: 0.4rem 0.6rem;
  border-radius: 4px;
  border: 1px solid var(--control-border);
  background: var(--control-bg);
  color: var(--text);
  font-size: 0.9rem;
  cursor: pointer;
  transition: background 0.2s, color 0.2s, border-color 0.2s;
}

.controls-tunings select {
  font-size: 0.8rem;
  padding: 0.3rem 0.4rem;
}

/* Add/remove string buttons */
.string-btn {
  width: 2rem;
  height: 2rem;
  padding: 0;
  border-radius: 4px;
  border: 1px solid var(--control-border);
  background: var(--control-bg);
  color: var(--text);
  font-size: 1.1rem;
  cursor: pointer;
  transition: background 0.2s, color 0.2s, border-color 0.2s;
}

.string-btn:disabled {
  opacity: 0.3;
  cursor: default;
}

/* --- Quiz controls --- */
.controls-quiz {
  align-items: center;
}

/* Quiz mode picker dropdown */
.quiz-mode-picker {
  position: relative;
}

#quiz-mode-btn {
  padding: 0.4rem 0.8rem;
  border-radius: 4px;
  border: 1px solid var(--control-border);
  background: var(--control-bg);
  color: var(--text);
  font-size: 0.85rem;
  cursor: pointer;
  transition: background 0.2s, color 0.2s, border-color 0.2s;
}

.quiz-mode-dropdown {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  z-index: 10;
  margin-top: 4px;
  background: var(--control-bg);
  border: 1px solid var(--control-border);
  border-radius: 4px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
  max-height: 300px;
  overflow-y: auto;
  min-width: 240px;
  padding: 0.4rem 0;
}

.quiz-mode-dropdown.open {
  display: block;
}

.quiz-mode-family {
  padding: 0.3rem 0.6rem;
}

.quiz-mode-family label {
  font-weight: 600;
  font-size: 0.8rem;
}

.quiz-mode-item {
  padding: 0.2rem 0.6rem 0.2rem 1.4rem;
}

.quiz-mode-item label {
  font-size: 0.78rem;
}

.quiz-mode-dropdown label {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 0.35rem;
  text-transform: none;
  letter-spacing: normal;
  color: var(--text);
  cursor: pointer;
}

#quiz-randomize,
#quiz-show {
  padding: 0.4rem 0.8rem;
  border-radius: 4px;
  border: 1px solid var(--control-border);
  background: var(--control-bg);
  color: var(--text);
  font-size: 0.85rem;
  cursor: pointer;
  transition: background 0.2s, color 0.2s, border-color 0.2s;
}

#quiz-randomize:disabled,
#quiz-show:disabled {
  opacity: 0.3;
  cursor: default;
}

.fretboard-wrapper.quiz-hidden .fretboard {
  visibility: hidden;
}

.fretboard-wrapper.quiz-hidden {
  position: relative;
}

.fretboard-wrapper.quiz-hidden::after {
  content: "Visualize the pattern...";
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 1.1rem;
  color: var(--text-muted);
  pointer-events: none;
}

/* --- Fretboard --- */
.fretboard-wrapper {
  overflow-x: auto;
  padding-bottom: 1rem;
  display: flex;
  justify-content: center;
}

.fretboard {
  display: grid;
  min-width: max-content;
  margin: 0 auto;
}

.fret-number {
  width: 52px;
  font-size: 0.65rem;
  color: var(--text-dim);
  text-align: center;
  padding-bottom: 0.4rem;
}

.fret-cell {
  width: 52px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  border-right: 2px solid var(--fret-border);
}

.fret-cell.nut {
  border-right: 3px solid var(--nut-border);
}

/* String line */
.fret-cell::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--string-color);
  transform: translateY(-50%);
}

/* Note bubble */
.note {
  position: relative;
  z-index: 1;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  font-weight: 600;
  background: var(--note-bg);
  color: var(--note-color);
  transition: all 0.15s ease;
}

.note.in-scale {
  background: var(--scale-bg);
  color: var(--scale-color);
  box-shadow: 0 0 6px var(--scale-shadow);
}

.note.is-root {
  background: var(--root-bg);
  color: var(--root-color);
  box-shadow: 0 0 10px var(--root-shadow);
}

.note.hidden {
  opacity: 0;
}

.note.out-of-position {
  opacity: 0.6;
}

/* Blur non-position area when a position is active */
.fret-cell.out-of-position-cell {
  filter: blur(0.7px);
  opacity: 0.8;
}

/* Subtle glow for focused notes when a position is active */
.fretboard-wrapper.position-focus .fret-cell:not(.out-of-position-cell) .note.in-scale {
  box-shadow: 0 0 9px rgba(255, 255, 255, 0.3), 0 0 18px rgba(94, 103, 129, 0.45);
}

.fretboard-wrapper.position-focus .fret-cell:not(.out-of-position-cell) .note.is-root {
  box-shadow: 0 0 10px rgba(255, 255, 255, 0.35), 0 0 18px rgba(200, 124, 104, 0.6);
}

/* Fret markers (dots) */
.fret-marker {
  width: 52px;
  height: 0.5rem;
  margin-top: 0.3rem;
  display: flex;
  gap: 4px;
  justify-content: center;
}

.fret-marker .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--dot-color);
}

/* --- Creator footer --- */
.creator {
  margin-top: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  justify-content: center;
  align-items: center;
  text-align: center;
  color: var(--text-muted);
}

.creator-name {
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  color: var(--text);
}

.creator-link {
  font-size: 0.9rem;
  color: var(--text);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s, color 0.2s;
}

.creator-link:hover {
  border-color: var(--text);
}