/* 主菜单 */
#menu-screen {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: var(--bg-primary);
}

.menu-title {
  font-size: 72px;
  font-weight: 800;
  letter-spacing: 8px;
  margin-bottom: 60px;
  background: linear-gradient(135deg, var(--accent-gold), var(--accent-blue));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.menu-buttons {
  display: flex;
  flex-direction: column;
  gap: 16px;
  min-width: 240px;
}

.menu-buttons .btn {
  width: 100%;
  padding: 16px 32px;
  font-size: 18px;
}

/* 选歌界面 */
#select-screen {
  display: flex;
  flex-direction: column;
  background: var(--bg-primary);
  padding: 40px;
}

.select-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 30px;
}

.select-header h2 {
  font-size: 28px;
  font-weight: 700;
}

.song-list {
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-width: 700px;
  margin: 0 auto;
  width: 100%;
}

.song-item {
  display: flex;
  align-items: center;
  padding: 20px 24px;
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all 0.2s ease;
  border: 2px solid transparent;
}

.song-item:hover {
  background: #222240;
  border-color: rgba(74, 158, 255, 0.3);
}

.song-item.selected {
  border-color: var(--accent-blue);
  background: rgba(74, 158, 255, 0.1);
}

.song-info {
  flex: 1;
}

.song-title {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 4px;
}

.song-artist {
  font-size: 14px;
  color: var(--text-secondary);
}

.song-difficulty {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 4px;
  font-size: 14px;
  font-weight: 600;
  background: var(--accent-blue);
  color: #fff;
}

.song-score {
  text-align: right;
  margin-left: 20px;
}

.song-score .score-grade {
  font-size: 28px;
  font-weight: 800;
  color: var(--accent-gold);
}

.song-score .score-value {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--text-secondary);
}

/* 结算界面 */
#results-screen {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: var(--bg-primary);
}

.results-grade {
  font-size: 120px;
  font-weight: 900;
  margin-bottom: 20px;
}

.results-grade.grade-phi { color: #FFD700; text-shadow: 0 0 80px rgba(255,215,0,0.6); }
.results-grade.grade-v { color: #FFD700; text-shadow: 0 0 40px rgba(255,215,0,0.3); }
.results-grade.grade-v.fc { color: var(--accent-blue); text-shadow: 0 0 40px rgba(74,158,255,0.4); }
.results-grade.grade-s { color: #FFD700; text-shadow: 0 0 30px rgba(255,215,0,0.3); }
.results-grade.grade-a { color: var(--accent-blue); }
.results-grade.grade-b { color: var(--accent-green); }
.results-grade.grade-c { color: var(--text-primary); }
.results-grade.grade-f { color: var(--text-secondary); }

.results-status {
  font-size: 32px;
  font-weight: 900;
  margin-bottom: 10px;
  min-height: 40px;
}
.results-status.fc { color: var(--accent-blue); }
.results-status.ap { color: #FFD700; }

.results-score {
  font-family: var(--font-mono);
  font-size: 48px;
  font-weight: 700;
  margin-bottom: 10px;
}

.results-accuracy {
  font-family: var(--font-mono);
  font-size: 24px;
  color: var(--text-secondary);
  margin-bottom: 40px;
}

.results-breakdown {
  display: flex;
  gap: 30px;
  margin-bottom: 40px;
}

.results-breakdown .item {
  text-align: center;
}

.results-breakdown .item-count {
  font-family: var(--font-mono);
  font-size: 32px;
  font-weight: 700;
}

.results-breakdown .item-label {
  font-size: 14px;
  color: var(--text-secondary);
  margin-top: 4px;
}

.results-breakdown .item.perfect .item-count { color: var(--accent-gold); }
.results-breakdown .item.good .item-count { color: var(--accent-blue); }
.results-breakdown .item.bad .item-count { color: var(--accent-red); }
.results-breakdown .item.miss .item-count { color: var(--text-secondary); }

.results-buttons {
  display: flex;
  gap: 16px;
}

/* 设置界面 */
#settings-screen {
  display: flex;
  flex-direction: column;
  background: var(--bg-primary);
  padding: 40px;
  overflow-y: auto;
}

.settings-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 30px;
}

.settings-group {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-bottom: 20px;
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
  width: 100%;
}

.settings-group h3 {
  font-size: 18px;
  margin-bottom: 16px;
  color: var(--accent-blue);
}

.settings-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 0;
  border-bottom: 1px solid rgba(255,255,255,0.05);
}

.settings-row:last-child {
  border-bottom: none;
}

.settings-row label {
  color: var(--text-secondary);
}

.settings-row input[type="range"] {
  width: 150px;
  accent-color: var(--accent-blue);
}

.settings-row input[type="number"],
.settings-row input[type="text"] {
  width: 80px;
  padding: 6px 10px;
  background: var(--bg-secondary);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 14px;
}

.settings-row .key-bind {
  display: flex;
  gap: 8px;
}

.settings-row .key-bind .key {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-secondary);
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s ease;
}

.settings-row .key-bind .key:hover {
  border-color: var(--accent-blue);
}

.settings-row .key-bind .key.listening {
  border-color: var(--accent-gold);
  background: rgba(255,215,0,0.1);
}