/* ============================================
   Chord Lab — 深色 DAW 风格主题
   配色：深灰蓝背景 + 琥珀色高亮 + 珊瑚色低音标记
   ============================================ */

:root {
  --bg-primary: #16161e;
  --bg-secondary: #1e1e28;
  --bg-tertiary: #262632;
  --bg-hover: #2e2e3c;
  --text-primary: #e8e6e3;
  --text-secondary: #9a98a0;
  --text-dim: #6a6870;
  --accent: #e8a838;          /* 琥珀色：和弦音高亮 */
  --accent-dim: rgba(232, 168, 56, 0.15);
  --bass: #e0705a;            /* 珊瑚色：转位低音标记 */
  --bass-dim: rgba(224, 112, 90, 0.15);
  --border: #333340;
  --key-white: #f2f0ec;
  --key-white-active: #e8a838;
  --key-black: #1a1a22;
  --key-black-active: #c8882a;
  --radius: 8px;
}

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

body {
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  min-height: 100vh;
  overflow-x: hidden;
}

#app {
  max-width: 1100px;
  margin: 0 auto;
  padding: 20px 24px;
}

/* ---- 标题栏 ---- */
#header {
  display: flex;
  align-items: baseline;
  gap: 16px;
  margin-bottom: 20px;
}

#header h1 {
  font-size: 26px;
  font-weight: 800;
  letter-spacing: -0.5px;
  color: var(--accent);
}

#header .subtitle {
  font-size: 13px;
  color: var(--text-dim);
}

/* ---- 控制区 ---- */
#controls {
  display: flex;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 16px;
  margin-bottom: 16px;
}

.control-group {
  display: flex;
  align-items: center;
  gap: 10px;
}

.control-label {
  font-size: 12px;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  cursor: default;
}

/* 音量滑块 */
#volume-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 120px;
  height: 4px;
  border-radius: 2px;
  background: var(--bg-tertiary);
  outline: none;
  cursor: pointer;
}

#volume-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  border: none;
}

#volume-slider::-moz-range-thumb {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  border: none;
}

/* 开关按钮 */
.toggle-btn {
  padding: 6px 14px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
  user-select: none;
}

.toggle-btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.toggle-btn.active {
  background: var(--accent-dim);
  border-color: var(--accent);
  color: var(--accent);
}

/* 转位按钮组 */
#inversion-buttons {
  display: flex;
  gap: 4px;
}

.inv-btn {
  padding: 6px 12px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
}

.inv-btn:hover {
  background: var(--bg-hover);
}

.inv-btn.active {
  background: var(--accent-dim);
  border-color: var(--accent);
  color: var(--accent);
}

.inv-btn.hidden {
  display: none;
}

/* ---- 和弦选择区（手风琴） ---- */
#chord-selector {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 16px;
  overflow: hidden;
}

.chord-group {
  border-bottom: 1px solid var(--border);
}

.chord-group:last-child {
  border-bottom: none;
}

.chord-group-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  cursor: pointer;
  user-select: none;
  transition: background 0.15s;
}

.chord-group-header:hover {
  background: var(--bg-hover);
}

.chord-group-header .arrow {
  font-size: 10px;
  color: var(--text-dim);
  transition: transform 0.2s;
  width: 12px;
}

.chord-group.open .arrow {
  transform: rotate(90deg);
}

.chord-group-header .group-name {
  font-size: 14px;
  font-weight: 700;
}

.chord-group-header .group-desc {
  font-size: 12px;
  color: var(--text-dim);
}

.chord-group-body {
  display: none;
  padding: 4px 16px 14px 38px;
}

.chord-group.open .chord-group-body {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

/* 根音按钮 */
.root-btn {
  min-width: 48px;
  padding: 8px 10px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--bg-tertiary);
  color: var(--text-primary);
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.12s;
  user-select: none;
  text-align: center;
  line-height: 1.2;
}

.root-btn:hover {
  background: var(--bg-hover);
  border-color: var(--text-dim);
}

.root-btn.selected {
  background: var(--accent);
  border-color: var(--accent);
  color: #1a1a22;
  box-shadow: 0 0 10px rgba(232, 168, 56, 0.35);
}

.root-btn .btn-sub {
  display: block;
  font-size: 9px;
  font-weight: 400;
  opacity: 0.6;
  margin-top: 1px;
}

/* 锁定根音时的视觉提示 */
.root-btn.locked-root {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

/* ---- 当前和弦信息 ---- */
#chord-info {
  display: flex;
  align-items: baseline;
  gap: 14px;
  flex-wrap: wrap;
  padding: 10px 16px;
  margin-bottom: 16px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

#chord-name {
  font-size: 28px;
  font-weight: 800;
  color: var(--accent);
}

#chord-type-name {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
}

#chord-feel {
  font-size: 13px;
  color: var(--text-secondary);
}

#chord-notes-display {
  font-size: 13px;
  color: var(--text-dim);
  margin-left: auto;
  font-family: "SF Mono", "Consolas", monospace;
}

/* ---- 键盘区 ---- */
#keyboard-section {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  overflow-x: auto;
}

#keyboard-container {
  min-width: 900px;
}

#keyboard-container svg {
  display: block;
  width: 100%;
  height: auto;
}

/* SVG 琴键样式 */
.key-white {
  fill: var(--key-white);
  stroke: #3a3a44;
  stroke-width: 1;
  cursor: pointer;
  transition: fill 0.1s;
}

.key-white:hover {
  fill: #e0ded8;
}

.key-white.highlighted {
  fill: var(--key-white-active);
}

.key-white.highlighted-bass {
  fill: var(--bass);
}

.key-black {
  fill: var(--key-black);
  stroke: #0e0e14;
  stroke-width: 1;
  cursor: pointer;
  transition: fill 0.1s;
}

.key-black:hover {
  fill: #2a2a34;
}

.key-black.highlighted {
  fill: var(--key-black-active);
}

.key-black.highlighted-bass {
  fill: var(--bass);
}

/* 键上音名标注 */
.key-label {
  font-size: 11px;
  font-weight: 700;
  fill: #6a6870;
  pointer-events: none;
  text-anchor: middle;
}

.key-label.on-highlight {
  fill: #1a1a22;
}

.key-label-black {
  font-size: 9px;
  font-weight: 600;
  fill: #8a8890;
  pointer-events: none;
  text-anchor: middle;
}

.key-label-black.on-highlight {
  fill: #fff;
}

/* 音程标注（琴键上方连线） */
.interval-line {
  stroke: var(--accent);
  stroke-width: 1.5;
  fill: none;
  opacity: 0.8;
}

.interval-text {
  font-size: 10px;
  fill: var(--accent);
  text-anchor: middle;
  pointer-events: none;
}

.interval-text-detail {
  font-size: 9px;
  fill: var(--text-secondary);
  text-anchor: middle;
  pointer-events: none;
}

/* 角色标注（琴键下方） */
.role-text {
  font-size: 11px;
  font-weight: 700;
  fill: var(--accent);
  text-anchor: middle;
  pointer-events: none;
}

.role-text.bass-role {
  fill: var(--bass);
}

/* ---- 和弦进行区（手风琴，默认折叠） ---- */
#progression-section {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-top: 16px;
  overflow: hidden;
}

.prog-accordion-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 16px;
  cursor: pointer;
  user-select: none;
  transition: background 0.15s;
}

.prog-accordion-header:hover {
  background: var(--bg-hover);
}

.prog-accordion-header .arrow {
  font-size: 10px;
  color: var(--text-dim);
  transition: transform 0.2s;
  width: 12px;
}

.prog-accordion.open .arrow {
  transform: rotate(90deg);
}

.prog-title {
  font-size: 14px;
  font-weight: 700;
}

.prog-subtitle {
  font-size: 12px;
  color: var(--text-dim);
}

.prog-accordion-body {
  display: none;
  padding: 4px 16px 16px 38px;
}

.prog-accordion.open .prog-accordion-body {
  display: block;
}

.prog-controls {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 14px;
}

.prog-loop {
  font-size: 12px;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 5px;
  cursor: pointer;
  user-select: none;
}

.prog-loop input {
  accent-color: var(--accent);
  cursor: pointer;
}

.prog-play-btn {
  margin-left: auto;
  padding: 8px 18px;
  border-radius: 8px;
  border: none;
  background: linear-gradient(135deg, var(--accent), #d18f28);
  color: #1a1a22;
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.15s;
  box-shadow: 0 3px 10px rgba(232, 168, 56, 0.3);
}

.prog-play-btn:hover {
  filter: brightness(1.1);
}

.prog-play-btn.playing {
  background: #c0564a;
  box-shadow: 0 3px 10px rgba(192, 86, 74, 0.3);
  color: #fff;
}

.prog-presets {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}

.prog-preset-btn {
  padding: 8px 14px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  text-align: left;
  transition: all 0.15s;
}

.prog-preset-btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.prog-preset-btn.active {
  border-color: var(--accent);
  background: var(--accent-dim);
  color: var(--accent);
}

.prog-preset-desc {
  display: block;
  font-size: 10px;
  font-weight: 400;
  opacity: 0.7;
  margin-top: 2px;
}

.prog-chords {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.prog-chord-card {
  padding: 10px 16px;
  border-radius: 10px;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  text-align: center;
  transition: all 0.18s;
  min-width: 64px;
}

.prog-chord-card.active {
  background: var(--accent-dim);
  border-color: var(--accent);
  transform: scale(1.12);
  box-shadow: 0 0 12px rgba(232, 168, 56, 0.35);
}

.prog-chord-symbol {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
}

.prog-chord-card.active .prog-chord-symbol {
  color: var(--accent);
}

.prog-chord-type {
  font-size: 10px;
  color: var(--text-dim);
  margin-top: 2px;
}

/* ---- 页脚 ---- */
#footer {
  margin-top: 16px;
  text-align: center;
  font-size: 12px;
  color: var(--text-dim);
}