/* ===================================
   音阶练习系统 - 美育科技融合主题
   Inspired by 14islands.com - 浅色优雅版
   =================================== */

/* ===== CSS变量定义 ===== */
:root {
    /* 主题色 - 浅色优雅 */
    --bg-primary: #fafbfc;
    --bg-secondary: #ffffff;
    --bg-card: rgba(255, 255, 255, 0.9);
    --bg-glass: rgba(255, 255, 255, 0.7);
    --bg-subtle: #f5f6f8;
    
    /* 渐变色 - 音乐美学 */
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
    --gradient-accent: linear-gradient(135deg, #00d4aa 0%, #00a8cc 50%, #667eea 100%);
    --gradient-warm: linear-gradient(135deg, #ff6b6b 0%, #ffa45b 50%, #ffd93d 100%);
    --gradient-soft: linear-gradient(135deg, #e0c3fc 0%, #8ec5fc 100%);
    --gradient-glow: radial-gradient(ellipse at center, rgba(102, 126, 234, 0.08) 0%, transparent 70%);
    
    /* 文字颜色 */
    --text-primary: #1a1a2e;
    --text-secondary: #4a4a68;
    --text-muted: #8b8ba7;
    
    /* 强调色 */
    --accent-purple: #764ba2;
    --accent-blue: #667eea;
    --accent-pink: #f093fb;
    --accent-teal: #00d4aa;
    --accent-coral: #ff6b6b;
    
    /* 功能色 */
    --success: #00d4aa;
    --warning: #ffa45b;
    --error: #ff6b6b;
    
    /* 边框和阴影 */
    --border-subtle: rgba(0, 0, 0, 0.06);
    --border-light: rgba(102, 126, 234, 0.15);
    --shadow-soft: 0 4px 24px rgba(0, 0, 0, 0.06);
    --shadow-medium: 0 8px 40px rgba(0, 0, 0, 0.08);
    --shadow-glow: 0 20px 60px rgba(102, 126, 234, 0.12);
    --shadow-card: 0 2px 16px rgba(0, 0, 0, 0.04);
    
    /* 字体 */
    --font-display: 'Noto Serif SC', 'Source Han Serif CN', 'STSong', Georgia, serif;
    --font-body: 'Noto Sans SC', 'Source Han Sans CN', 'Microsoft YaHei', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'SF Mono', monospace;
    
    /* 动画 */
    --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);
    --ease-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);
    --ease-elastic: cubic-bezier(0.68, -0.6, 0.32, 1.6);
}

/* ===== 重置和基础样式 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ===== 动态背景 ===== */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(ellipse at 20% 0%, rgba(102, 126, 234, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 100%, rgba(240, 147, 251, 0.06) 0%, transparent 50%),
        radial-gradient(ellipse at 60% 50%, rgba(0, 212, 170, 0.04) 0%, transparent 40%);
    pointer-events: none;
    z-index: 0;
}

/* 动态光晕效果 */
.ambient-glow {
    position: fixed;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.5;
    pointer-events: none;
    z-index: 0;
    animation: floatGlow 25s ease-in-out infinite;
}

.glow-1 {
    top: -150px;
    left: -150px;
    width: 400px;
    height: 400px;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.2), rgba(118, 75, 162, 0.15));
    animation-delay: 0s;
}

.glow-2 {
    bottom: -150px;
    right: -150px;
    width: 450px;
    height: 450px;
    background: linear-gradient(135deg, rgba(240, 147, 251, 0.15), rgba(0, 212, 170, 0.1));
    animation-delay: -12s;
}

.glow-3 {
    top: 40%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(102, 126, 234, 0.06) 0%, transparent 70%);
    animation: pulseGlow 10s ease-in-out infinite;
}

@keyframes floatGlow {
    0%, 100% { transform: translate(0, 0) scale(1); }
    25% { transform: translate(30px, 20px) scale(1.05); }
    50% { transform: translate(-20px, 30px) scale(0.95); }
    75% { transform: translate(-30px, -20px) scale(1.02); }
}

@keyframes pulseGlow {
    0%, 100% { opacity: 0.4; transform: translate(-50%, -50%) scale(1); }
    50% { opacity: 0.6; transform: translate(-50%, -50%) scale(1.15); }
}

/* ===== 音波装饰 ===== */
.sound-waves {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: 120px;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

.wave {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 100%;
    background: linear-gradient(to top, rgba(102, 126, 234, 0.03) 0%, transparent 100%);
}

.wave::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--gradient-accent);
    opacity: 0.2;
}

/* ===== 容器布局 ===== */
.container {
    position: relative;
    max-width: 1000px;
    margin: 0 auto;
    padding: 40px 24px;
    z-index: 1;
}

/* ===== 头部样式 ===== */
header {
    text-align: center;
    margin-bottom: 48px;
    padding: 48px 0;
    position: relative;
}

header::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(102, 126, 234, 0.04) 0%, transparent 70%);
    pointer-events: none;
}

header h1 {
    font-family: var(--font-display);
    font-size: clamp(2.2rem, 5vw, 3.2rem);
    font-weight: 600;
    letter-spacing: 0.02em;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 16px;
    position: relative;
    display: inline-block;
    animation: titleReveal 1s var(--ease-smooth) forwards;
    opacity: 0;
    transform: translateY(30px);
}

@keyframes titleReveal {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

header h1::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 50px;
    height: 3px;
    background: var(--gradient-accent);
    border-radius: 2px;
    animation: lineExpand 0.8s var(--ease-smooth) 0.5s forwards;
    opacity: 0;
}

@keyframes lineExpand {
    to {
        opacity: 1;
        width: 100px;
    }
}

header p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 480px;
    margin: 24px auto 0;
    animation: fadeUp 0.8s var(--ease-smooth) 0.3s forwards;
    opacity: 0;
    transform: translateY(20px);
    line-height: 1.7;
}

@keyframes fadeUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===== 曲目信息卡片 ===== */
.song-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: 20px;
    padding: 28px 32px;
    margin-bottom: 28px;
    border: 1px solid var(--border-subtle);
    box-shadow: var(--shadow-card);
    animation: cardSlideUp 0.6s var(--ease-smooth) 0.4s forwards;
    opacity: 0;
    transform: translateY(40px);
    position: relative;
    overflow: hidden;
}

.song-info::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-primary);
    opacity: 0.6;
}

@keyframes cardSlideUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.song-title h2 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 6px;
    letter-spacing: 0.01em;
}

.song-title p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

.song-meta {
    display: flex;
    gap: 10px;
    align-items: center;
    flex-wrap: wrap;
}

.song-meta span {
    padding: 8px 16px;
    border-radius: 100px;
    font-size: 0.85rem;
    font-weight: 500;
    letter-spacing: 0.01em;
    transition: all 0.3s var(--ease-smooth);
}

.song-meta .difficulty {
    background: linear-gradient(135deg, rgba(0, 212, 170, 0.1), rgba(0, 168, 204, 0.1));
    color: var(--accent-teal);
    border: 1px solid rgba(0, 212, 170, 0.2);
}

.song-meta .composer {
    background: linear-gradient(135deg, rgba(118, 75, 162, 0.1), rgba(240, 147, 251, 0.1));
    color: var(--accent-purple);
    border: 1px solid rgba(118, 75, 162, 0.15);
}

.song-meta .duration {
    background: linear-gradient(135deg, rgba(255, 164, 91, 0.1), rgba(255, 217, 61, 0.1));
    color: #e67e22;
    border: 1px solid rgba(255, 164, 91, 0.2);
}

/* ===== 乐谱容器 ===== */
.score-container {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: 24px;
    padding: 32px;
    margin-bottom: 28px;
    border: 1px solid var(--border-subtle);
    box-shadow: var(--shadow-medium);
    animation: cardSlideUp 0.6s var(--ease-smooth) 0.5s forwards;
    opacity: 0;
    transform: translateY(40px);
    position: relative;
}

.score-container::after {
    content: '♪';
    position: absolute;
    top: 24px;
    right: 28px;
    font-size: 1.8rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    opacity: 0.4;
}

.staff {
    margin-bottom: 20px;
    overflow: hidden;
    border-radius: 16px;
    background: var(--bg-subtle);
    padding: 20px;
    border: 1px solid var(--border-subtle);
}

#staffCanvas {
    display: block;
    margin: 0 auto;
    border-radius: 12px;
    background: #ffffff;
    box-shadow: var(--shadow-soft);
}

/* ===== OSMD乐谱容器 ===== */
.osmd-container {
    margin-bottom: 20px;
    overflow-x: auto;
    overflow-y: auto;
    border-radius: 16px;
    background: #ffffff;
    padding: 24px;
    border: 1px solid var(--border-subtle);
    box-shadow: var(--shadow-soft);
    min-height: 200px;
    max-height: 600px;  /* 增加最大高度 */
}

.osmd-container svg {
    width: 100%;
    height: auto;
    min-width: 700px;  /* 确保有足够宽度显示 */
}

/* ===== 实时K歌滚动可视化 ===== */
.realtime-karaoke-container {
    display: flex;
    background: linear-gradient(135deg, #fafbfc 0%, #f0f2f8 100%);
    border-radius: 16px;
    overflow: hidden;
    border: 1px solid var(--border-subtle);
    box-shadow: var(--shadow-soft);
    margin-bottom: 16px;
}

.realtime-pitch-labels {
    width: 45px;
    flex-shrink: 0;
    background: linear-gradient(180deg, rgba(102, 126, 234, 0.08) 0%, rgba(118, 75, 162, 0.08) 100%);
    border-right: 1px solid var(--border-subtle);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: 8px 0;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--text-muted);
}

.realtime-pitch-labels .pitch-label {
    text-align: center;
    padding: 2px 4px;
    line-height: 1;
}

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

#realtimeKaraokeCanvas {
    display: block;
    width: 100%;
    height: 200px;
}

/* 当前位置指示线 - 固定在左侧1/4位置 */
.current-position-line {
    position: absolute;
    left: 25%;
    top: 0;
    bottom: 0;
    width: 3px;
    background: linear-gradient(180deg, var(--accent-teal) 0%, var(--accent-blue) 100%);
    box-shadow: 0 0 12px rgba(0, 212, 170, 0.6), 0 0 24px rgba(0, 212, 170, 0.3);
    z-index: 10;
    border-radius: 2px;
}

.current-position-line::before {
    content: '▼';
    position: absolute;
    top: -16px;
    left: 50%;
    transform: translateX(-50%);
    color: var(--accent-teal);
    font-size: 12px;
    text-shadow: 0 0 8px rgba(0, 212, 170, 0.5);
}

.current-position-line::after {
    content: '▲';
    position: absolute;
    bottom: -16px;
    left: 50%;
    transform: translateX(-50%);
    color: var(--accent-teal);
    font-size: 12px;
    text-shadow: 0 0 8px rgba(0, 212, 170, 0.5);
}

/* ===== 加载状态 ===== */
.loading-status {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 40px 20px;
    color: var(--text-muted);
    font-size: 0.95rem;
    gap: 16px;
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-subtle);
    border-top-color: var(--accent-blue);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

/* 简化乐谱容器 */
#simpleStaff {
    display: block;
}

/* ===== 进度条 ===== */
.progress-bar {
    width: 100%;
    height: 6px;
    background: rgba(102, 126, 234, 0.1);
    border-radius: 10px;
    overflow: hidden;
    margin-top: 20px;
    position: relative;
}

.progress {
    height: 100%;
    background: var(--gradient-accent);
    width: 0%;
    transition: width 0.1s linear;
    border-radius: 10px;
    position: relative;
    box-shadow: 0 0 12px rgba(0, 212, 170, 0.4);
}

.progress::after {
    content: '';
    position: absolute;
    right: -2px;
    top: 50%;
    transform: translateY(-50%);
    width: 12px;
    height: 12px;
    background: #fff;
    border: 3px solid var(--accent-teal);
    border-radius: 50%;
    box-shadow: 0 0 10px rgba(0, 212, 170, 0.5);
}

/* ===== 预览音频播放器 ===== */
.preview-audio-container {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: 16px;
    padding: 20px 24px;
    margin-bottom: 24px;
    border: 1px solid var(--border-subtle);
    box-shadow: var(--shadow-soft);
    animation: cardSlideUp 0.6s var(--ease-smooth) 0.55s forwards;
    opacity: 0;
    transform: translateY(30px);
}

.preview-audio-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 14px;
}

.preview-icon {
    font-size: 1.3rem;
}

.preview-title {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 1rem;
}

.preview-hint {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-left: auto;
    padding: 4px 12px;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1), rgba(118, 75, 162, 0.1));
    border-radius: 100px;
}

.preview-audio-player {
    position: relative;
}

.preview-audio-player audio {
    width: 100%;
    height: 44px;
    border-radius: 10px;
    outline: none;
}

/* 自定义音频播放器样式 - Webkit浏览器 */
.preview-audio-player audio::-webkit-media-controls-panel {
    background: linear-gradient(135deg, #f5f6f8 0%, #eef0f5 100%);
    border-radius: 10px;
}

.preview-audio-player audio::-webkit-media-controls-play-button {
    background-color: var(--accent-blue);
    border-radius: 50%;
}

.preview-audio-player audio::-webkit-media-controls-current-time-display,
.preview-audio-player audio::-webkit-media-controls-time-remaining-display {
    color: var(--text-secondary);
    font-family: var(--font-mono);
    font-size: 12px;
}

/* ===== 控制按钮区域 ===== */
.controls {
    text-align: center;
    margin-bottom: 36px;
    animation: fadeUp 0.6s var(--ease-smooth) 0.6s forwards;
    opacity: 0;
    transform: translateY(20px);
}

.play-btn {
    position: relative;
    background: var(--gradient-primary);
    color: white;
    border: none;
    padding: 18px 44px;
    font-size: 1.1rem;
    font-weight: 600;
    letter-spacing: 0.03em;
    border-radius: 100px;
    cursor: pointer;
    transition: all 0.4s var(--ease-smooth);
    box-shadow: 
        0 8px 30px rgba(102, 126, 234, 0.25),
        inset 0 1px 0 rgba(255, 255, 255, 0.2);
    display: inline-flex;
    align-items: center;
    gap: 12px;
    overflow: hidden;
}

.play-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.25), transparent);
    transition: left 0.5s var(--ease-smooth);
}

.play-btn:hover::before {
    left: 100%;
}

.play-btn:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 
        0 16px 48px rgba(102, 126, 234, 0.35),
        inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

.play-btn:active {
    transform: translateY(-1px) scale(0.99);
}

.play-icon {
    font-size: 1.3rem;
    transition: transform 0.3s var(--ease-bounce);
}

.play-btn:hover .play-icon {
    transform: scale(1.15);
}

/* ===== 倒计时 ===== */
.countdown {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 200px;
}

#countdownNumber {
    font-family: var(--font-display);
    font-size: 7rem;
    font-weight: 300;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: countPulse 1s var(--ease-elastic) infinite;
}

@keyframes countPulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.12); opacity: 0.85; }
}

/* ===== 录音状态 ===== */
.recording-status {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: 24px;
    padding: 28px;
    margin-bottom: 28px;
    border: 1px solid var(--border-subtle);
    box-shadow: var(--shadow-medium);
    animation: slideDown 0.4s var(--ease-smooth);
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.recording-indicator {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 20px;
    font-size: 1.05rem;
    color: var(--accent-coral);
    font-weight: 600;
    letter-spacing: 0.02em;
}

.pulse {
    width: 14px;
    height: 14px;
    background: var(--accent-coral);
    border-radius: 50%;
    animation: recordPulse 1.5s ease-in-out infinite;
    box-shadow: 0 0 16px rgba(255, 107, 107, 0.5);
}

@keyframes recordPulse {
    0%, 100% { 
        opacity: 1; 
        transform: scale(1);
        box-shadow: 0 0 0 0 rgba(255, 107, 107, 0.4);
    }
    50% { 
        opacity: 0.7; 
        transform: scale(1.2);
        box-shadow: 0 0 0 12px rgba(255, 107, 107, 0);
    }
}

/* ===== 音高可视化 ===== */
.pitch-visualization {
    margin-top: 24px;
}

.pitch-display {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 14px;
    background: var(--bg-subtle);
    padding: 20px;
    border-radius: 16px;
    margin-bottom: 20px;
    border: 1px solid var(--border-subtle);
}

.pitch-info {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 14px;
    background: var(--bg-secondary);
    border-radius: 12px;
    transition: all 0.3s var(--ease-smooth);
    border: 1px solid var(--border-subtle);
}

.pitch-info:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-soft);
}

.pitch-info .label {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-weight: 500;
}

.pitch-value, .accuracy-value {
    font-family: var(--font-mono);
    font-size: 1.4rem;
    font-weight: 600;
}

#currentPitch {
    color: var(--accent-purple);
}

#targetPitch {
    color: var(--text-primary);
}

#accuracy {
    color: var(--accent-teal);
}

/* ===== 音高指示器 ===== */
.pitch-indicator-container {
    background: var(--bg-subtle);
    border-radius: 16px;
    padding: 20px;
    margin-bottom: 20px;
    border: 1px solid var(--border-subtle);
}

.pitch-scale {
    position: relative;
    height: 200px;
    background: linear-gradient(to bottom, 
        rgba(118, 75, 162, 0.06) 0%, 
        rgba(102, 126, 234, 0.04) 50%, 
        rgba(0, 212, 170, 0.06) 100%);
    border-radius: 12px;
    border: 1px solid var(--border-subtle);
    overflow: hidden;
}

.pitch-lines {
    position: relative;
    height: 100%;
}

.pitch-line {
    position: absolute;
    width: 100%;
    height: 1px;
    background: linear-gradient(90deg, transparent 5%, rgba(102, 126, 234, 0.2) 50%, transparent 95%);
}

.pitch-line[data-note="C6"] { top: 5%; }
.pitch-line[data-note="B5"] { top: 15%; }
.pitch-line[data-note="A5"] { top: 25%; }
.pitch-line[data-note="G5"] { top: 35%; }
.pitch-line[data-note="F5"] { top: 45%; }
.pitch-line[data-note="E5"] { top: 55%; }
.pitch-line[data-note="D5"] { top: 65%; }
.pitch-line[data-note="C5"] { top: 75%; }
.pitch-line[data-note="B4"] { top: 85%; }
.pitch-line[data-note="A4"] { top: 95%; }

.pitch-line::after {
    content: attr(data-note);
    position: absolute;
    right: 14px;
    top: -9px;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--text-muted);
    font-weight: 500;
}

.current-pitch-indicator, .target-pitch-indicator {
    position: absolute;
    left: 0;
    right: 0;
    height: 6px;
    border-radius: 3px;
    transition: top 0.1s var(--ease-smooth);
}

.current-pitch-indicator {
    background: var(--gradient-primary);
    box-shadow: 0 0 12px rgba(102, 126, 234, 0.5);
    z-index: 2;
}

.target-pitch-indicator {
    background: linear-gradient(90deg, #c5cae9, #9fa8da);
    box-shadow: 0 2px 8px rgba(102, 126, 234, 0.2);
    z-index: 1;
    height: 10px;
    border-radius: 5px;
}

/* ===== 波形显示 ===== */
.waveform-container {
    background: var(--bg-subtle);
    border-radius: 16px;
    padding: 16px;
    border: 1px solid var(--border-subtle);
}

#waveformCanvas {
    width: 100%;
    height: 100px;
    border-radius: 12px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-subtle);
}

/* ===== 结果页面 ===== */
.results {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: 28px;
    padding: 40px;
    border: 1px solid var(--border-subtle);
    box-shadow: var(--shadow-glow);
    text-align: center;
    animation: resultReveal 0.6s var(--ease-smooth);
    position: relative;
    overflow: hidden;
}

.results::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
}

@keyframes resultReveal {
    from {
        opacity: 0;
        transform: scale(0.96) translateY(20px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

.results h2 {
    font-family: var(--font-display);
    font-size: 1.9rem;
    font-weight: 500;
    margin-bottom: 32px;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.score-display {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    margin-bottom: 32px;
}

.score-item {
    background: var(--bg-subtle);
    border: 1px solid var(--border-light);
    padding: 24px 18px;
    border-radius: 20px;
    transition: all 0.4s var(--ease-smooth);
    position: relative;
    overflow: hidden;
}

.score-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-accent);
}

.score-item:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-medium);
    border-color: var(--border-light);
}

.score-label {
    display: block;
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 10px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-weight: 500;
}

.score-value {
    display: block;
    font-family: var(--font-mono);
    font-size: 2.6rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ===== 音高可视化 - 浅色块状风格 ===== */
.karaoke-visualizer {
    margin: 32px 0;
    background: var(--bg-card);
    border-radius: 20px;
    padding: 24px;
    position: relative;
    border: 1px solid var(--border-subtle);
    box-shadow: var(--shadow-medium);
}

.karaoke-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.karaoke-title {
    color: var(--text-primary);
    font-size: 1.1rem;
    font-weight: 500;
    letter-spacing: 0.02em;
}

.replay-btn {
    background: var(--gradient-primary);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 100px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s var(--ease-smooth);
    display: flex;
    align-items: center;
    gap: 8px;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.25);
}

.replay-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.35);
}

.karaoke-canvas-wrapper {
    display: flex;
    gap: 0;
    align-items: stretch;
}

.karaoke-canvas-wrapper .pitch-labels {
    height: 240px;
}

.pitch-labels {
    width: 44px;
    display: flex;
    flex-direction: column;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-muted);
    text-align: right;
    padding-right: 10px;
    font-weight: 500;
}

.pitch-label {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: flex-end;
}

.karaoke-canvas-container {
    flex: 1;
    position: relative;
    border-radius: 12px;
    overflow: hidden;
    background: var(--bg-subtle);
    border: 1px solid var(--border-subtle);
}

#karaokeCanvas {
    display: block;
    width: 100%;
    height: 240px;
}

.karaoke-cursor {
    position: absolute;
    left: 15%;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--gradient-primary);
    box-shadow: 0 0 10px rgba(102, 126, 234, 0.5);
    z-index: 10;
    pointer-events: none;
    display: none;
}

.karaoke-cursor.active {
    display: block;
}

.karaoke-cursor::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 12px;
    height: 12px;
    background: var(--accent-blue);
    border: 2px solid white;
    border-radius: 50%;
    box-shadow: 0 0 15px rgba(102, 126, 234, 0.6);
}

.karaoke-legend {
    display: flex;
    justify-content: center;
    gap: 30px;
    margin-top: 16px;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.legend-dot {
    width: 24px;
    height: 8px;
    border-radius: 4px;
}

.legend-item.target .legend-dot {
    background: linear-gradient(90deg, #c5cae9, #9fa8da);
    border: 1px solid rgba(102, 126, 234, 0.3);
}

.legend-item.actual .legend-dot {
    background: var(--gradient-primary);
    box-shadow: 0 2px 8px rgba(102, 126, 234, 0.3);
}

/* 响应式 */
@media (max-width: 768px) {
    .karaoke-visualizer {
        padding: 16px;
        margin: 24px 0;
    }
    
    .karaoke-header {
        flex-direction: column;
        gap: 12px;
        text-align: center;
    }
    
    .pitch-labels {
        width: 36px;
        font-size: 0.65rem;
    }
    
    #karaokeCanvas {
        height: 200px;
    }
    
    .karaoke-canvas-wrapper .pitch-labels {
        height: 200px;
    }
    
    .karaoke-legend {
        gap: 16px;
        flex-wrap: wrap;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .karaoke-visualizer {
        padding: 12px;
        border-radius: 14px;
    }
    
    .karaoke-title {
        font-size: 0.95rem;
    }
    
    .pitch-labels {
        width: 32px;
        font-size: 0.6rem;
        padding-right: 6px;
    }
    
    #karaokeCanvas {
        height: 160px;
    }
    
    .karaoke-canvas-wrapper .pitch-labels {
        height: 160px;
    }
    
    .legend-item {
        font-size: 0.75rem;
    }
}

/* ===== 录音播放器 ===== */
.recording-player {
    background: var(--bg-subtle);
    border-radius: 16px;
    padding: 24px;
    margin: 24px 0;
    border: 1px solid var(--border-subtle);
}

.recording-player h3 {
    font-family: var(--font-display);
    color: var(--text-primary);
    margin-bottom: 16px;
    font-size: 1.15rem;
    font-weight: 500;
}

.recording-player audio {
    width: 100%;
    height: 44px;
    border-radius: 12px;
    outline: none;
}

/* ===== 按钮组 ===== */
.result-actions {
    display: flex;
    gap: 14px;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 28px;
}

.retry-btn {
    background: var(--gradient-accent);
    color: white;
    border: none;
    padding: 16px 36px;
    font-size: 1rem;
    font-weight: 600;
    letter-spacing: 0.02em;
    border-radius: 100px;
    cursor: pointer;
    transition: all 0.4s var(--ease-smooth);
    box-shadow: 0 8px 28px rgba(0, 212, 170, 0.25);
}

.retry-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 14px 40px rgba(0, 212, 170, 0.35);
}

.download-result-btn {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 2px solid var(--border-light);
    padding: 14px 30px;
    font-size: 1rem;
    font-weight: 500;
    letter-spacing: 0.02em;
    border-radius: 100px;
    cursor: pointer;
    transition: all 0.4s var(--ease-smooth);
    display: inline-flex;
    align-items: center;
    gap: 10px;
}

.download-result-btn:hover {
    background: var(--bg-subtle);
    border-color: var(--accent-purple);
    color: var(--accent-purple);
    transform: translateY(-2px);
}

/* ===== 录音控制样式 ===== */
.recording-controls {
    background: var(--bg-subtle);
    border-radius: 16px;
    padding: 24px;
    margin: 20px 0;
    border: 1px solid var(--border-subtle);
}

.recording-controls h3 {
    font-family: var(--font-display);
    color: var(--text-primary);
    margin-bottom: 16px;
    font-size: 1.15rem;
    font-weight: 500;
}

.recording-actions {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
}

.download-btn, .play-recording-btn {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-light);
    padding: 12px 22px;
    font-size: 0.95rem;
    font-weight: 500;
    border-radius: 100px;
    cursor: pointer;
    transition: all 0.3s var(--ease-smooth);
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.download-btn:hover, .play-recording-btn:hover {
    background: var(--bg-subtle);
    border-color: var(--accent-blue);
    color: var(--accent-blue);
    transform: translateY(-2px);
    box-shadow: var(--shadow-soft);
}

/* ===== 响应式设计 ===== */
@media (max-width: 768px) {
    .container {
        padding: 24px 16px;
    }
    
    header {
        padding: 32px 0;
        margin-bottom: 32px;
    }
    
    header h1 {
        font-size: 1.9rem;
    }
    
    .song-info {
        flex-direction: column;
        gap: 18px;
        text-align: center;
        padding: 24px;
    }
    
    .song-meta {
        justify-content: center;
    }
    
    .score-container {
        padding: 24px;
    }
    
    #staffCanvas {
        width: 100%;
        height: auto;
    }
    
    .pitch-display {
        grid-template-columns: 1fr;
        gap: 10px;
    }
    
    .score-display {
        grid-template-columns: 1fr;
        gap: 12px;
    }
    
    .score-item {
        padding: 20px;
    }
    
    .score-value {
        font-size: 2.2rem;
    }
    
    .play-btn {
        padding: 16px 32px;
        font-size: 1rem;
    }
    
    #countdownNumber {
        font-size: 5rem;
    }
    
    .result-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .retry-btn, .download-result-btn {
        width: 100%;
        max-width: 260px;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    header h1 {
        font-size: 1.6rem;
    }
    
    header p {
        font-size: 0.95rem;
    }
    
    .song-title h2 {
        font-size: 1.25rem;
    }
    
    .score-container {
        padding: 16px;
        border-radius: 16px;
    }
    
    .staff {
        padding: 14px;
    }
    
    .pitch-indicator-container {
        padding: 14px;
    }
    
    .pitch-scale {
        height: 150px;
    }
    
    .results {
        padding: 24px;
        border-radius: 20px;
    }
    
    .results h2 {
        font-size: 1.5rem;
    }
    
    .chart-container {
        height: 260px;
        padding: 16px;
    }
}

/* ===== 动画工具类 ===== */
.fade-in {
    animation: fadeIn 0.5s var(--ease-smooth) forwards;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.slide-up {
    animation: slideUp 0.4s var(--ease-smooth) forwards;
}

@keyframes slideUp {
    from { transform: translateY(30px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

/* ===== 加载状态 ===== */
.loading {
    display: inline-block;
    width: 22px;
    height: 22px;
    border: 3px solid var(--border-subtle);
    border-top-color: var(--accent-blue);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ===== 工具提示 ===== */
.tooltip {
    position: relative;
    display: inline-block;
}

.tooltip .tooltiptext {
    visibility: hidden;
    width: 200px;
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    color: var(--text-primary);
    text-align: center;
    border-radius: 12px;
    padding: 12px;
    position: absolute;
    z-index: 10;
    bottom: 125%;
    left: 50%;
    margin-left: -100px;
    opacity: 0;
    transition: all 0.3s var(--ease-smooth);
    font-size: 0.9rem;
    border: 1px solid var(--border-subtle);
    box-shadow: var(--shadow-medium);
}

.tooltip:hover .tooltiptext {
    visibility: visible;
    opacity: 1;
    transform: translateY(-5px);
}

/* ===== 曲目选择界面 ===== */
.song-selector {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border-radius: 24px;
    padding: 32px;
    margin-bottom: 28px;
    border: 1px solid var(--border-subtle);
    box-shadow: var(--shadow-medium);
}

.song-selector h2 {
    text-align: center;
    font-family: var(--font-display);
    color: var(--text-primary);
    margin-bottom: 28px;
    font-size: 1.5rem;
}

.song-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 18px;
}

.song-card {
    background: var(--bg-secondary);
    border-radius: 16px;
    padding: 22px;
    cursor: pointer;
    transition: all 0.4s var(--ease-smooth);
    border: 1px solid var(--border-subtle);
    position: relative;
    overflow: hidden;
}

.song-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s var(--ease-smooth);
}

.song-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-medium);
    border-color: var(--border-light);
}

.song-card:hover::before {
    transform: scaleX(1);
}

.song-card.selected {
    border-color: var(--accent-teal);
    box-shadow: 0 0 24px rgba(0, 212, 170, 0.15);
}

.song-card h3 {
    color: var(--text-primary);
    font-size: 1.15rem;
    margin-bottom: 6px;
}

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

.difficulty-badge {
    padding: 5px 12px;
    border-radius: 100px;
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.difficulty-badge.beginner {
    background: linear-gradient(135deg, rgba(0, 212, 170, 0.12), rgba(0, 168, 204, 0.12));
    color: var(--accent-teal);
}

.difficulty-badge.intermediate {
    background: linear-gradient(135deg, rgba(255, 164, 91, 0.12), rgba(255, 217, 61, 0.12));
    color: #e67e22;
}

.difficulty-badge.advanced {
    background: linear-gradient(135deg, rgba(255, 107, 107, 0.12), rgba(240, 147, 251, 0.12));
    color: var(--accent-coral);
}

/* ===== 滚动条美化 ===== */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-subtle);
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, var(--accent-purple), var(--accent-blue));
    border-radius: 10px;
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(180deg, var(--accent-pink), var(--accent-purple));
}

/* ===== 选择文本样式 ===== */
::selection {
    background: rgba(102, 126, 234, 0.2);
    color: var(--text-primary);
}

::-moz-selection {
    background: rgba(102, 126, 234, 0.2);
    color: var(--text-primary);
}