:root {
  --bg-primary: #0f0f1e;
  --bg-secondary: #1a1a2e;
  --bg-panel: #16162a;
  --accent-in-tune: #00ff88;
  --accent-sharp: #ffaa00;
  --accent-flat: #ff4444;
  --accent-primary: #00d9ff;
  --text-primary: #ffffff;
  --text-secondary: rgba(255,255,255,0.7);
  --text-muted: rgba(255,255,255,0.5);
  --grid-line: rgba(255,255,255,0.08);
  --border-color: rgba(255,255,255,0.12);
  --control-bg: rgba(255,255,255,0.06);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  overflow: hidden;
  height: 100vh;
  width: 100vw;
}

/* 启动覆盖层 */
#startOverlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 15, 30, 0.97);
  z-index: 1000;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
}

#startOverlay h1 {
  color: var(--accent-in-tune);
  font-size: 2.5rem;
  font-weight: bold;
}

#startOverlay p {
  color: var(--text-secondary);
  font-size: 1rem;
}

#startOverlay .subtitle {
  color: var(--text-muted);
  font-size: 0.9rem;
}

#startButton {
  padding: 14px 48px;
  font-size: 1.1rem;
  background: var(--accent-in-tune);
  color: var(--bg-primary);
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-weight: bold;
  margin-top: 8px;
}

#startButton:hover {
  background: #00e07a;
}

/* 主布局 */
.app-container {
  display: flex;
  height: 100vh;
  width: 100vw;
}

/* 左侧面板 */
.pitch-panel {
  width: 320px;
  min-width: 280px;
  background: var(--bg-panel);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  padding: 16px;
  gap: 12px;
  overflow-y: auto;
}

/* 乐器选择 */
.instrument-bar {
  display: flex;
  gap: 8px;
}

.instrument-bar select {
  flex: 1;
  padding: 8px 10px;
  background: var(--control-bg);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  font-size: 14px;
}

/* 弦指示器 */
.string-indicators {
  display: flex;
  gap: 6px;
  justify-content: center;
  flex-wrap: wrap;
}

.string-btn {
  padding: 6px 12px;
  background: var(--control-bg);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  cursor: pointer;
  font-size: 12px;
  transition: all 0.2s;
}

.string-btn:hover {
  background: rgba(255,255,255,0.12);
}

.string-btn.active {
  background: var(--accent-primary);
  color: var(--bg-primary);
  border-color: var(--accent-primary);
}

.string-btn.in-tune {
  background: var(--accent-in-tune);
  color: var(--bg-primary);
  border-color: var(--accent-in-tune);
}

/* 半圆形表盘 */
.dial-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 8px 0;
}

#pitchDial {
  width: 280px;
  height: 160px;
}

.note-info {
  text-align: center;
}

.note-display {
  font-size: 3.5rem;
  font-weight: bold;
  color: var(--text-primary);
  line-height: 1.1;
}

.cents-display {
  font-size: 1.8rem;
  font-weight: bold;
  color: var(--accent-in-tune);
  line-height: 1.2;
}

.cents-display.sharp {
  color: var(--accent-sharp);
}

.cents-display.flat {
  color: var(--accent-flat);
}

.hz-display {
  font-size: 1rem;
  color: var(--text-muted);
}

/* 目标音高 */
.target-display {
  text-align: center;
  font-size: 13px;
  color: var(--text-secondary);
  padding: 4px;
  background: var(--control-bg);
  border-radius: 6px;
}

/* 控制区 */
.controls-grid {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.control-row {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
}

.control-row label {
  min-width: 70px;
  color: var(--text-secondary);
}

.control-row input[type="range"] {
  flex: 1;
  height: 4px;
  -webkit-appearance: none;
  appearance: none;
  background: linear-gradient(to right, var(--accent-flat), var(--accent-in-tune), var(--accent-sharp));
  border-radius: 2px;
  outline: none;
}

.control-row input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--text-primary);
  cursor: pointer;
}

.control-row select {
  flex: 1;
  padding: 5px 8px;
  background: var(--control-bg);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  font-size: 13px;
}

.control-row span {
  color: var(--text-secondary);
  min-width: 36px;
  text-align: right;
}

/* Zone Cut Filter */
.filter-section {
  background: var(--control-bg);
  border-radius: 8px;
  padding: 10px;
  border: 1px solid var(--border-color);
}

.filter-title {
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.filter-row {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 6px;
  font-size: 12px;
}

.filter-row:last-child {
  margin-bottom: 0;
}

.filter-row label {
  min-width: 50px;
  color: var(--text-secondary);
}

.filter-row input[type="number"] {
  width: 55px;
  padding: 4px 6px;
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  font-size: 12px;
}

.filter-row span {
  color: var(--text-muted);
}

/* 参考音生成器 */
.tone-section {
  display: flex;
  gap: 8px;
}

.tone-section button {
  flex: 1;
  padding: 8px;
  background: var(--accent-primary);
  color: var(--bg-primary);
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-size: 13px;
  font-weight: bold;
}

.tone-section button:hover {
  background: #00b8d4;
}

.tone-section button.playing {
  background: var(--accent-in-tune);
}

.tone-section select {
  padding: 6px 8px;
  background: var(--control-bg);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  font-size: 13px;
}

/* 中间频谱面板 */
.spectrum-panel {
  flex: 1;
  display: flex;
  flex-direction: column;
  background: var(--bg-secondary);
  min-width: 0;
}

.spectrum-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 16px;
  border-bottom: 1px solid var(--border-color);
  flex-shrink: 0;
}

.spectrum-header span {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
}

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

.spectrum-controls select {
  padding: 5px 10px;
  background: var(--control-bg);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  font-size: 12px;
}

.spectrum-canvas-wrapper {
  flex: 1;
  position: relative;
  overflow: hidden;
}

#spectrumCanvas {
  width: 100%;
  height: 100%;
  display: block;
}

.peak-list {
  padding: 8px 16px;
  border-top: 1px solid var(--border-color);
  font-size: 12px;
  color: var(--text-secondary);
  flex-shrink: 0;
  white-space: nowrap;
  overflow-x: auto;
}

.peak-label {
  color: var(--text-muted);
  margin-right: 8px;
}

/* 右侧统计面板 */
.stats-panel {
  width: 260px;
  min-width: 220px;
  background: var(--bg-panel);
  border-left: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.stats-tabs {
  display: flex;
  border-bottom: 1px solid var(--border-color);
}

.tab-btn {
  flex: 1;
  padding: 10px;
  background: transparent;
  color: var(--text-muted);
  border: none;
  cursor: pointer;
  font-size: 13px;
  transition: all 0.2s;
}

.tab-btn:hover {
  color: var(--text-secondary);
}

.tab-btn.active {
  color: var(--accent-primary);
  border-bottom: 2px solid var(--accent-primary);
}

.tab-content {
  display: none;
  flex: 1;
  flex-direction: column;
  overflow: hidden;
  padding: 12px;
}

.tab-content.active {
  display: flex;
}

.stats-controls,
.sample-controls {
  display: flex;
  gap: 8px;
  margin-bottom: 12px;
  flex-shrink: 0;
}

.stats-controls select,
.sample-controls select {
  flex: 1;
  padding: 6px 8px;
  background: var(--control-bg);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  font-size: 12px;
}

.stats-controls button,
.sample-controls button {
  padding: 6px 12px;
  background: var(--control-bg);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  cursor: pointer;
  font-size: 12px;
}

.stats-controls button:hover,
.sample-controls button:hover {
  background: rgba(255,255,255,0.12);
}

.stats-table-wrapper {
  flex: 1;
  overflow-y: auto;
  border: 1px solid var(--border-color);
  border-radius: 6px;
}

#statsTable {
  width: 100%;
  border-collapse: collapse;
  font-size: 12px;
}

#statsTable th {
  position: sticky;
  top: 0;
  background: rgba(255,255,255,0.08);
  padding: 8px 6px;
  text-align: center;
  font-weight: 600;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border-color);
}

#statsTable td {
  padding: 7px 6px;
  text-align: center;
  border-bottom: 1px solid var(--grid-line);
  color: var(--text-secondary);
}

#statsTable tr:hover td {
  background: rgba(255,255,255,0.03);
}

#statsTable .empty {
  color: var(--text-muted);
  padding: 24px;
}

/* 样本列表 */
.sample-list {
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.sample-list .empty {
  color: var(--text-muted);
  text-align: center;
  padding: 24px;
  font-size: 13px;
}

.sample-item {
  background: var(--control-bg);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 8px 10px;
  font-size: 12px;
  cursor: pointer;
  transition: background 0.2s;
}

.sample-item:hover {
  background: rgba(255,255,255,0.1);
}

.sample-item .sample-note {
  font-weight: bold;
  color: var(--text-primary);
}

.sample-item .sample-cents {
  color: var(--accent-in-tune);
}

.sample-item .sample-cents.sharp {
  color: var(--accent-sharp);
}

.sample-item .sample-cents.flat {
  color: var(--accent-flat);
}

.sample-item .sample-hz {
  color: var(--text-muted);
  font-size: 11px;
}

/* ============ 底部导航栏 (竖屏用) ============ */
.bottom-nav {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: 52px;
  background: var(--bg-panel);
  border-top: 1px solid var(--border-color);
  z-index: 100;
  justify-content: space-around;
  align-items: center;
  padding: 0 8px;
}

.nav-btn {
  flex: 1;
  height: 40px;
  margin: 0 4px;
  background: transparent;
  color: var(--text-muted);
  border: none;
  border-radius: 8px;
  font-size: 14px;
  cursor: pointer;
  transition: all 0.2s;
}

.nav-btn.active {
  background: rgba(0, 217, 255, 0.15);
  color: var(--accent-primary);
  font-weight: 600;
}

/* ============ 竖屏响应式 ============ */
@media (max-width: 900px), (orientation: portrait) {
  .app-container {
    flex-direction: column;
    height: calc(100vh - 52px);
    padding-bottom: 52px;
  }

  .bottom-nav {
    display: flex;
  }

  /* 面板默认隐藏 */
  .pitch-panel,
  .spectrum-panel,
  .stats-panel {
    display: none;
    width: 100%;
    min-width: auto;
    height: 100%;
    border: none;
    overflow-y: auto;
  }

  /* 只有 active 的面板显示 */
  .pitch-panel.panel-active,
  .spectrum-panel.panel-active,
  .stats-panel.panel-active {
    display: flex;
  }

  .spectrum-panel {
    min-height: 0;
  }

  .stats-panel {
    max-height: none;
  }

  #pitchDial {
    width: 260px;
    height: 150px;
  }

  .note-display {
    font-size: 3rem;
  }

  .dial-container {
    padding: 4px 0;
  }
}

/* ============ 横屏响应式 ============ */
@media (min-width: 901px) and (orientation: landscape) {
  .bottom-nav {
    display: none !important;
  }

  .pitch-panel,
  .spectrum-panel,
  .stats-panel {
    display: flex !important;
  }
}

/* 返回链接 */
.back-link {
  text-align: center;
  margin-top: auto;
  padding-top: 8px;
}

.back-link a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 12px;
  letter-spacing: 0.1em;
  transition: color 0.3s;
  padding: 4px 8px;
  border-radius: 4px;
}

.back-link a:hover {
  color: var(--accent-primary);
}

/* 触控优化 */
button,
select,
input[type="range"] {
  touch-action: manipulation;
}