/* 基础样式重置 */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* 主色调 - 电音紫 */
    --primary: #7c3aed;
    --primary-light: #a78bfa;
    --primary-dark: #5b21b6;
    
    /* 辅助色 */
    --secondary: #06b6d4;
    --secondary-light: #67e8f9;
    --accent: #f59e0b;
    
    /* 背景色 */
    --bg-dark: #0f0a1a;
    --bg-darker: #0a0612;
    --bg-card: rgba(255, 255, 255, 0.03);
    --bg-card-hover: rgba(255, 255, 255, 0.06);
    
    /* 文字色 */
    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.7);
    --text-muted: rgba(255, 255, 255, 0.5);
    
    /* 边框 */
    --border-color: rgba(255, 255, 255, 0.1);
    --border-radius: 12px;
    --border-radius-lg: 20px;
    
    /* 阴影 */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 40px rgba(124, 58, 237, 0.3);
    
    /* 渐变 */
    --gradient-primary: linear-gradient(135deg, #7c3aed 0%, #06b6d4 100%);
    --gradient-dark: linear-gradient(180deg, #0f0a1a 0%, #0a0612 100%);
    --gradient-card: linear-gradient(145deg, rgba(124, 58, 237, 0.1) 0%, rgba(6, 182, 212, 0.05) 100%);
    
    /* 过渡 */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(15, 10, 26, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition-normal);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.logo i {
    font-size: 1.8rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 32px;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    transition: var(--transition-fast);
    position: relative;
}

.nav-link:hover {
    color: var(--text-primary);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: var(--transition-fast);
}

.nav-link:hover::after {
    width: 100%;
}

.nav-download-btn {
    background: var(--gradient-primary);
    color: white;
    padding: 10px 24px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9rem;
    transition: var(--transition-fast);
    box-shadow: 0 4px 15px rgba(124, 58, 237, 0.3);
}

.nav-download-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(124, 58, 237, 0.4);
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
}

.bar {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: var(--transition-fast);
}

/* Hero 区域 */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    padding: 70px 0 0;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    overflow: hidden;
}

.gradient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.4;
    animation: float 20s infinite ease-in-out;
}

.orb-1 {
    width: 600px;
    height: 600px;
    background: var(--primary);
    top: -200px;
    right: -100px;
    animation-delay: 0s;
}

.orb-2 {
    width: 400px;
    height: 400px;
    background: var(--secondary);
    bottom: -100px;
    left: -100px;
    animation-delay: -5s;
}

.orb-3 {
    width: 300px;
    height: 300px;
    background: var(--accent);
    top: 50%;
    left: 30%;
    animation-delay: -10s;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    25% { transform: translate(50px, -50px) scale(1.1); }
    50% { transform: translate(0, 50px) scale(0.95); }
    75% { transform: translate(-50px, -25px) scale(1.05); }
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(245, 158, 11, 0.15);
    border: 1px solid rgba(245, 158, 11, 0.3);
    padding: 8px 16px;
    border-radius: 50px;
    font-size: 0.85rem;
    color: var(--accent);
    margin-bottom: 24px;
}

.hero-title {
    font-size: 4rem;
    font-weight: 900;
    line-height: 1.1;
    margin-bottom: 16px;
}

.hero-title .highlight {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--primary-light);
    font-weight: 600;
    margin-bottom: 16px;
}

.hero-description {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 32px;
    line-height: 1.8;
}

.hero-stats {
    display: flex;
    gap: 40px;
    margin-bottom: 40px;
}

.stat-item {
    display: flex;
    flex-direction: column;
}

.stat-number {
    font-size: 1.8rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.hero-cta {
    display: flex;
    gap: 16px;
    margin-bottom: 32px;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 32px;
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition-fast);
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 4px 20px rgba(124, 58, 237, 0.4);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(124, 58, 237, 0.5);
}

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 2px solid var(--border-color);
}

.btn-secondary:hover {
    border-color: var(--primary-light);
    background: rgba(124, 58, 237, 0.1);
}

.hero-platforms {
    display: flex;
    gap: 24px;
}

.platform-item {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.platform-item i {
    font-size: 1.2rem;
}

/* Hero 视觉区域 */
.hero-visual {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

.app-mockup {
    width: 380px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    backdrop-filter: blur(10px);
}

.mockup-header {
    padding: 16px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
}

.mockup-dots {
    display: flex;
    gap: 6px;
}

.mockup-dots span {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.mockup-dots span:nth-child(1) { background: #ff5f57; }
.mockup-dots span:nth-child(2) { background: #febc2e; }
.mockup-dots span:nth-child(3) { background: #28c840; }

.mockup-content {
    padding: 30px;
}

.wave-visualizer {
    display: flex;
    align-items: flex-end;
    justify-content: center;
    gap: 4px;
    height: 120px;
    margin-bottom: 24px;
}

.wave-bar {
    width: 8px;
    background: var(--gradient-primary);
    border-radius: 4px;
    animation: wave 1.2s ease-in-out infinite;
}

.wave-bar:nth-child(1) { height: 40%; animation-delay: 0s; }
.wave-bar:nth-child(2) { height: 70%; animation-delay: 0.1s; }
.wave-bar:nth-child(3) { height: 50%; animation-delay: 0.2s; }
.wave-bar:nth-child(4) { height: 90%; animation-delay: 0.3s; }
.wave-bar:nth-child(5) { height: 60%; animation-delay: 0.4s; }
.wave-bar:nth-child(6) { height: 80%; animation-delay: 0.5s; }
.wave-bar:nth-child(7) { height: 45%; animation-delay: 0.6s; }
.wave-bar:nth-child(8) { height: 95%; animation-delay: 0.7s; }
.wave-bar:nth-child(9) { height: 55%; animation-delay: 0.8s; }
.wave-bar:nth-child(10) { height: 75%; animation-delay: 0.9s; }
.wave-bar:nth-child(11) { height: 65%; animation-delay: 1s; }
.wave-bar:nth-child(12) { height: 85%; animation-delay: 1.1s; }
.wave-bar:nth-child(13) { height: 40%; animation-delay: 0s; }
.wave-bar:nth-child(14) { height: 70%; animation-delay: 0.1s; }
.wave-bar:nth-child(15) { height: 50%; animation-delay: 0.2s; }
.wave-bar:nth-child(16) { height: 90%; animation-delay: 0.3s; }
.wave-bar:nth-child(17) { height: 60%; animation-delay: 0.4s; }
.wave-bar:nth-child(18) { height: 80%; animation-delay: 0.5s; }
.wave-bar:nth-child(19) { height: 45%; animation-delay: 0.6s; }
.wave-bar:nth-child(20) { height: 95%; animation-delay: 0.7s; }

@keyframes wave {
    0%, 100% { transform: scaleY(1); }
    50% { transform: scaleY(0.6); }
}

.mockup-info {
    text-align: center;
    margin-bottom: 24px;
}

.track-name {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.track-meta {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.mockup-controls {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 20px;
}

.control-btn {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
    cursor: pointer;
    transition: var(--transition-fast);
}

.control-btn:hover {
    background: var(--primary);
    border-color: var(--primary);
}

.control-btn.play {
    width: 56px;
    height: 56px;
    background: var(--gradient-primary);
    border: none;
    font-size: 1.2rem;
}

/* 浮动卡片 */
.floating-cards {
    position: absolute;
    inset: 0;
    pointer-events: none;
    z-index: 2;
}

.float-card {
    position: absolute;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 12px 20px;
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.9rem;
    font-weight: 500;
    backdrop-filter: blur(10px);
    animation: float-card 6s ease-in-out infinite;
}

.float-card i {
    color: var(--primary-light);
}

.card-1 {
    top: 10%;
    left: -20px;
    animation-delay: 0s;
}

.card-2 {
    top: 40%;
    right: -40px;
    animation-delay: -2s;
}

.card-3 {
    bottom: 20%;
    left: -30px;
    animation-delay: -4s;
}

@keyframes float-card {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-15px); }
}

/* 滚动指示器 */
.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    color: var(--text-muted);
    font-size: 0.8rem;
    z-index: 2;
}

.mouse {
    width: 26px;
    height: 40px;
    border: 2px solid var(--text-muted);
    border-radius: 13px;
    display: flex;
    justify-content: center;
    padding-top: 8px;
}

.wheel {
    width: 4px;
    height: 8px;
    background: var(--text-muted);
    border-radius: 2px;
    animation: scroll 2s infinite;
}

@keyframes scroll {
    0% { transform: translateY(0); opacity: 1; }
    100% { transform: translateY(12px); opacity: 0; }
}

/* 通用区域样式 */
section {
    padding: 100px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-header.light {
    color: var(--text-primary);
}

.section-tag {
    display: inline-block;
    background: rgba(124, 58, 237, 0.15);
    border: 1px solid rgba(124, 58, 237, 0.3);
    padding: 6px 16px;
    border-radius: 50px;
    font-size: 0.85rem;
    color: var(--primary-light);
    margin-bottom: 16px;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 16px;
}

.section-desc {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* 精选分析区域 */
.analysis-section {
    background: var(--bg-darker);
}

.analysis-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.analysis-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 32px;
    transition: var(--transition-normal);
}

.analysis-card:hover {
    background: var(--bg-card-hover);
    border-color: rgba(124, 58, 237, 0.3);
    transform: translateY(-4px);
}

.analysis-card.main-card {
    grid-column: span 2;
}

.card-icon {
    width: 56px;
    height: 56px;
    background: var(--gradient-primary);
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 20px;
}

.card-icon.pulse {
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { box-shadow: 0 0 0 0 rgba(124, 58, 237, 0.4); }
    50% { box-shadow: 0 0 0 15px rgba(124, 58, 237, 0); }
}

.analysis-card h3 {
    font-size: 1.3rem;
    margin-bottom: 12px;
}

.analysis-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 20px;
}

.source-types {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.source-tag {
    background: rgba(124, 58, 237, 0.1);
    border: 1px solid rgba(124, 58, 237, 0.2);
    padding: 8px 16px;
    border-radius: 50px;
    font-size: 0.85rem;
    display: flex;
    align-items: center;
    gap: 6px;
}

.source-tag i {
    color: var(--primary-light);
}

.monitoring-visual {
    display: flex;
    align-items: center;
    gap: 8px;
}

.monitor-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--text-muted);
}

.monitor-dot.active {
    background: #10b981;
    animation: blink 1.5s infinite;
}

@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

.monitor-text {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-left: 8px;
}

.accuracy-chart {
    display: flex;
    align-items: flex-end;
    gap: 12px;
    height: 80px;
}

.chart-bar {
    flex: 1;
    height: var(--height);
    background: var(--gradient-primary);
    border-radius: 4px 4px 0 0;
    transition: var(--transition-normal);
}

.chart-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-left: auto;
}

.recommendation-preview {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.rec-item {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.rec-item i {
    color: var(--primary-light);
}

/* AI分析区域 */
.ai-section {
    background: linear-gradient(180deg, var(--bg-dark) 0%, #1a1030 50%, var(--bg-dark) 100%);
}

.ai-content {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 60px;
    align-items: center;
}

.ai-interface {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.ai-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 12px;
}

.ai-header i {
    font-size: 1.3rem;
    color: var(--primary-light);
}

.ai-header span {
    font-weight: 600;
}

.ai-status {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.status-dot {
    width: 8px;
    height: 8px;
    background: #10b981;
    border-radius: 50%;
    animation: blink 2s infinite;
}

.ai-body {
    padding: 32px;
    display: flex;
    gap: 40px;
}

.analysis-progress {
    flex-shrink: 0;
}

.progress-ring {
    position: relative;
    width: 140px;
    height: 140px;
}

.progress-ring svg {
    transform: rotate(-90deg);
}

.progress-bg {
    fill: none;
    stroke: rgba(255, 255, 255, 0.1);
    stroke-width: 8;
}

.progress-bar {
    fill: none;
    stroke: url(#gradient);
    stroke-width: 8;
    stroke-linecap: round;
    stroke-dasharray: 339.292;
    stroke-dashoffset: 6.786;
    transition: stroke-dashoffset 1s ease;
}

.progress-text {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.progress-value {
    font-size: 2rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.progress-label {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.analysis-details {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.detail-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-color);
}

.detail-label {
    font-size: 0.9rem;
    color: var(--text-muted);
}

.detail-value {
    font-weight: 600;
}

.detail-value.highlight {
    color: var(--primary-light);
}

.ai-waveform {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 3px;
    height: 60px;
    padding: 0 24px 24px;
    opacity: 0.5;
}

.wave-line {
    width: 4px;
    background: var(--primary-light);
    border-radius: 2px;
    animation: ai-wave 1s ease-in-out infinite;
}

.wave-line:nth-child(1) { height: 20%; animation-delay: 0s; }
.wave-line:nth-child(2) { height: 60%; animation-delay: 0.05s; }
.wave-line:nth-child(3) { height: 40%; animation-delay: 0.1s; }
.wave-line:nth-child(4) { height: 80%; animation-delay: 0.15s; }
.wave-line:nth-child(5) { height: 50%; animation-delay: 0.2s; }
.wave-line:nth-child(6) { height: 70%; animation-delay: 0.25s; }
.wave-line:nth-child(7) { height: 30%; animation-delay: 0.3s; }
.wave-line:nth-child(8) { height: 90%; animation-delay: 0.35s; }
.wave-line:nth-child(9) { height: 45%; animation-delay: 0.4s; }
.wave-line:nth-child(10) { height: 65%; animation-delay: 0.45s; }
.wave-line:nth-child(11) { height: 25%; animation-delay: 0.5s; }
.wave-line:nth-child(12) { height: 75%; animation-delay: 0.55s; }
.wave-line:nth-child(13) { height: 55%; animation-delay: 0.6s; }
.wave-line:nth-child(14) { height: 85%; animation-delay: 0.65s; }
.wave-line:nth-child(15) { height: 35%; animation-delay: 0.7s; }
.wave-line:nth-child(16) { height: 95%; animation-delay: 0.75s; }
.wave-line:nth-child(17) { height: 40%; animation-delay: 0.8s; }
.wave-line:nth-child(18) { height: 70%; animation-delay: 0.85s; }
.wave-line:nth-child(19) { height: 50%; animation-delay: 0.9s; }
.wave-line:nth-child(20) { height: 80%; animation-delay: 0.95s; }

@keyframes ai-wave {
    0%, 100% { transform: scaleY(1); }
    50% { transform: scaleY(0.5); }
}

.ai-features {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.ai-feature-item {
    display: flex;
    gap: 20px;
    padding: 24px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    transition: var(--transition-normal);
}

.ai-feature-item:hover {
    background: var(--bg-card-hover);
    border-color: rgba(124, 58, 237, 0.3);
}

.ai-feature-item .feature-icon {
    width: 48px;
    height: 48px;
    background: rgba(124, 58, 237, 0.15);
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    color: var(--primary-light);
    flex-shrink: 0;
}

.ai-feature-item h4 {
    font-size: 1.1rem;
    margin-bottom: 6px;
}

.ai-feature-item p {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* 升降调区域 */
.pitch-section {
    background: var(--bg-darker);
}

.pitch-content {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 60px;
    align-items: center;
}

.pitch-controls {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 40px;
}

.pitch-wheel {
    position: relative;
    width: 280px;
    height: 280px;
}

.wheel-center {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 2;
}

.pitch-value {
    font-size: 4rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.pitch-unit {
    font-size: 0.9rem;
    color: var(--text-muted);
}

.wheel-markers {
    position: absolute;
    inset: 0;
}

.marker {
    position: absolute;
    font-size: 0.85rem;
    color: var(--text-muted);
    transform-origin: center;
}

.marker:nth-child(1) { top: 0; left: 50%; transform: translateX(-50%); }
.marker:nth-child(2) { top: 5%; right: 20%; }
.marker:nth-child(3) { top: 20%; right: 5%; }
.marker:nth-child(4) { top: 40%; right: 0; }
.marker:nth-child(5) { top: 60%; right: 0; }
.marker:nth-child(6) { top: 80%; right: 5%; }
.marker:nth-child(7) { bottom: 0; left: 50%; transform: translateX(-50%); color: var(--text-primary); font-weight: 600; }
.marker:nth-child(8) { top: 80%; left: 5%; }
.marker:nth-child(9) { top: 60%; left: 0; color: var(--primary-light); font-weight: 600; }
.marker:nth-child(10) { top: 40%; left: 0; }
.marker:nth-child(11) { top: 20%; left: 5%; }
.marker:nth-child(12) { top: 5%; left: 20%; }
.marker:nth-child(13) { top: 0; left: 50%; }

.pitch-slider-container {
    width: 100%;
    max-width: 300px;
}

.slider-labels {
    display: flex;
    justify-content: space-between;
    margin-bottom: 12px;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.pitch-slider {
    position: relative;
    height: 8px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
}

.slider {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
    z-index: 2;
}

.slider-track {
    position: absolute;
    inset: 0;
    border-radius: 4px;
    overflow: hidden;
}

.slider-fill {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: 4px;
    transition: width 0.3s ease;
}

.pitch-features {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.pitch-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 24px;
    transition: var(--transition-normal);
}

.pitch-card:hover {
    background: var(--bg-card-hover);
    border-color: rgba(124, 58, 237, 0.3);
}

.pitch-card .card-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
}

.pitch-card .card-header i {
    width: 40px;
    height: 40px;
    background: rgba(124, 58, 237, 0.15);
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-light);
}

.pitch-card h3 {
    font-size: 1.1rem;
}

.pitch-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.pitch-range-demo {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.range-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 14px;
    background: rgba(124, 58, 237, 0.1);
    border-radius: 8px;
    font-size: 0.9rem;
}

.range-value {
    color: var(--primary-light);
    font-weight: 600;
}

.memory-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.memory-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 14px;
    background: rgba(124, 58, 237, 0.1);
    border-radius: 8px;
    font-size: 0.9rem;
}

.memory-item i {
    color: var(--primary-light);
}

.song-name {
    flex: 1;
}

.song-pitch {
    color: var(--primary-light);
    font-weight: 600;
}

.quality-indicator {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.quality-bar {
    height: 8px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
    overflow: hidden;
}

.quality-fill {
    height: 100%;
    background: linear-gradient(90deg, #10b981 0%, #34d399 100%);
    border-radius: 4px;
    transition: width 1s ease;
}

.quality-text {
    font-size: 0.85rem;
    color: #10b981;
    font-weight: 600;
}

/* 人声消除区域 */
.vocal-section {
    background: linear-gradient(180deg, var(--bg-dark) 0%, #1a1030 50%, var(--bg-dark) 100%);
}

.vocal-content {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 60px;
    align-items: center;
}

.audio-splitter {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
}

.splitter-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.splitter-title {
    font-weight: 600;
}

.splitter-mode {
    display: flex;
    gap: 8px;
}

.mode-btn {
    padding: 8px 16px;
    border: 1px solid var(--border-color);
    background: transparent;
    color: var(--text-secondary);
    border-radius: 8px;
    font-size: 0.85rem;
    cursor: pointer;
    transition: var(--transition-fast);
}

.mode-btn.active {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
}

.splitter-display {
    padding: 24px;
}

.audio-track {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 16px;
    margin-bottom: 16px;
}

.audio-track.original {
    background: rgba(124, 58, 237, 0.1);
    border-color: rgba(124, 58, 237, 0.3);
}

.track-label {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 12px;
    font-size: 0.9rem;
}

.track-label i {
    color: var(--primary-light);
}

.track-status {
    margin-left: auto;
    padding: 4px 10px;
    border-radius: 50px;
    font-size: 0.75rem;
}

.track-status.muted {
    background: rgba(239, 68, 68, 0.15);
    color: #ef4444;
}

.track-status.active {
    background: rgba(16, 185, 129, 0.15);
    color: #10b981;
}

.track-waveform {
    display: flex;
    align-items: center;
    gap: 3px;
    height: 40px;
}

.track-waveform .wave-bar {
    flex: 1;
    height: 100%;
    background: var(--gradient-primary);
    border-radius: 2px;
    animation: vocal-wave 1.5s ease-in-out infinite;
}

.track-waveform.dimmed .wave-bar {
    background: rgba(255, 255, 255, 0.2);
    animation: none;
}

.track-waveform .wave-bar:nth-child(odd) { animation-delay: 0s; }
.track-waveform .wave-bar:nth-child(even) { animation-delay: 0.2s; }

@keyframes vocal-wave {
    0%, 100% { transform: scaleY(0.3); }
    50% { transform: scaleY(1); }
}

.splitter-arrow {
    text-align: center;
    color: var(--primary-light);
    font-size: 1.5rem;
    margin: 16px 0;
}

.audio-tracks-output {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.audio-tracks-output .audio-track {
    margin-bottom: 0;
}

.splitter-controls {
    padding: 20px 24px;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.control-group label {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.strength-slider {
    display: flex;
    align-items: center;
    gap: 12px;
}

.strength-slider input {
    width: 150px;
}

.strength-value {
    font-size: 0.9rem;
    color: var(--primary-light);
    font-weight: 600;
}

.apply-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    background: var(--gradient-primary);
    border: none;
    border-radius: 8px;
    color: white;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-fast);
}

.apply-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(124, 58, 237, 0.4);
}

.vocal-features {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.vocal-feature {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 24px;
    text-align: center;
    transition: var(--transition-normal);
}

.vocal-feature:hover {
    background: var(--bg-card-hover);
    border-color: rgba(124, 58, 237, 0.3);
    transform: translateY(-4px);
}

.vocal-feature .feature-icon {
    width: 56px;
    height: 56px;
    background: rgba(124, 58, 237, 0.15);
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--primary-light);
    margin: 0 auto 16px;
}

.vocal-feature h4 {
    font-size: 1.1rem;
    margin-bottom: 8px;
}

.vocal-feature p {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* 曲库区域 */
.library-section {
    background: var(--bg-darker);
}

.library-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    margin-bottom: 60px;
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 24px;
    display: flex;
    align-items: center;
    gap: 16px;
    transition: var(--transition-normal);
}

.stat-card:hover {
    background: var(--bg-card-hover);
    border-color: rgba(124, 58, 237, 0.3);
    transform: translateY(-4px);
}

.stat-card .stat-icon {
    width: 56px;
    height: 56px;
    background: rgba(124, 58, 237, 0.15);
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--primary-light);
}

.stat-card .stat-number {
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-card .stat-label {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.library-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
}

.genre-cloud h3,
.recommendation-system h3 {
    font-size: 1.3rem;
    margin-bottom: 24px;
}

.genre-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.genre-tag {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 10px 20px;
    border-radius: 50px;
    font-size: 0.9rem;
    transition: var(--transition-fast);
}

.genre-tag:hover {
    background: rgba(124, 58, 237, 0.15);
    border-color: rgba(124, 58, 237, 0.3);
    color: var(--primary-light);
}

.genre-tag.large {
    font-size: 1.1rem;
    padding: 12px 24px;
}

.recommendation-demo {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    overflow: hidden;
}

.rec-header {
    padding: 16px 20px;
    background: rgba(124, 58, 237, 0.1);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 600;
}

.rec-header i {
    color: var(--accent);
}

.rec-list {
    padding: 16px;
}

.rec-song {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 12px;
    border-radius: 8px;
    transition: var(--transition-fast);
}

.rec-song:hover {
    background: rgba(124, 58, 237, 0.1);
}

.song-number {
    width: 28px;
    height: 28px;
    background: rgba(124, 58, 237, 0.15);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--primary-light);
}

.song-info {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.song-title {
    font-weight: 600;
    font-size: 0.95rem;
}

.song-artist {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.match-badge {
    background: rgba(16, 185, 129, 0.15);
    color: #10b981;
    padding: 4px 10px;
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 600;
}

/* 技术优势区域 */
.tech-section {
    background: var(--bg-dark);
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-bottom: 60px;
}

.tech-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 32px;
    transition: var(--transition-normal);
}

.tech-card:hover {
    background: var(--bg-card-hover);
    border-color: rgba(124, 58, 237, 0.3);
    transform: translateY(-4px);
}

.tech-card.featured {
    background: var(--gradient-card);
    border-color: rgba(124, 58, 237, 0.4);
}

.tech-icon {
    width: 64px;
    height: 64px;
    background: rgba(124, 58, 237, 0.15);
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    color: var(--primary-light);
    margin-bottom: 20px;
}

.tech-card h3 {
    font-size: 1.3rem;
    margin-bottom: 12px;
}

.tech-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 20px;
}

.tech-metrics {
    display: flex;
    gap: 24px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
}

.metric {
    display: flex;
    flex-direction: column;
}

.metric-value {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--primary-light);
}

.metric-label {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.tech-highlights {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.highlight-item {
    display: flex;
    gap: 20px;
    padding: 24px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    transition: var(--transition-normal);
}

.highlight-item:hover {
    background: var(--bg-card-hover);
    border-color: rgba(124, 58, 237, 0.3);
}

.highlight-icon {
    width: 48px;
    height: 48px;
    background: rgba(124, 58, 237, 0.15);
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    color: var(--primary-light);
    flex-shrink: 0;
}

.highlight-content h4 {
    font-size: 1.1rem;
    margin-bottom: 6px;
}

.highlight-content p {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* 下载区域 */
.download-section {
    background: linear-gradient(135deg, #1a1030 0%, #0f0a1a 100%);
    padding: 80px 0;
}

.download-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 60px;
}

.download-text h2 {
    font-size: 2.5rem;
    margin-bottom: 16px;
}

.download-text p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.download-stats {
    display: flex;
    gap: 24px;
}

.download-stats span {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.download-stats i {
    color: var(--primary-light);
}

.download-buttons {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.download-btn {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px 28px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    text-decoration: none;
    color: var(--text-primary);
    transition: var(--transition-normal);
    min-width: 260px;
}

.download-btn:hover {
    background: var(--bg-card-hover);
    border-color: rgba(124, 58, 237, 0.3);
    transform: translateX(8px);
}

.download-btn i {
    font-size: 2rem;
    color: var(--primary-light);
}

.btn-text {
    display: flex;
    flex-direction: column;
}

.btn-label {
    font-weight: 600;
    font-size: 1rem;
}

.btn-version {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* 页脚 */
.footer {
    background: var(--bg-darker);
    border-top: 1px solid var(--border-color);
    padding: 60px 0 0;
}

.footer .container {
    padding-bottom: 24px;
}

.footer-content {
    display: grid;
    grid-template-columns: 1.5fr 2fr;
    gap: 60px;
    margin-bottom: 40px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 16px;
}

.footer-logo i {
    font-size: 1.8rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.footer-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 16px;
}

.contact-title {
    font-size: 1rem;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.footer-contact {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.contact-item i {
    width: 36px;
    height: 36px;
    background: rgba(124, 58, 237, 0.15);
    border: 1px solid rgba(124, 58, 237, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-light);
    font-size: 1rem;
    flex-shrink: 0;
}

.contact-item span {
    color: var(--text-primary);
    font-weight: 500;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}

.link-group h4 {
    font-size: 1rem;
    margin-bottom: 16px;
}

.link-group ul {
    list-style: none;
}

.link-group li {
    margin-bottom: 10px;
}

.link-group a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: var(--transition-fast);
}

.link-group a:hover {
    color: var(--primary-light);
}

.footer-bottom {
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    text-align: center;
}

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

.beian {
    display: flex;
    align-items: center;
    gap: 16px;
    font-size: 0.85rem;
}

.beian a {
    color: var(--text-muted);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: var(--transition-fast);
}

.beian a:hover {
    color: var(--primary-light);
}

.beian-icon {
    width: 16px;
    height: 16px;
}

.divider {
    color: var(--text-muted);
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-content {
        order: 1;
    }
    
    .hero-visual {
        order: 0;
    }
    
    .hero-stats {
        justify-content: center;
    }
    
    .hero-cta {
        justify-content: center;
    }
    
    .hero-platforms {
        justify-content: center;
    }
    
    .floating-cards {
        display: none;
    }
    
    .ai-content,
    .pitch-content,
    .vocal-content {
        grid-template-columns: 1fr;
    }
    
    .library-content {
        grid-template-columns: 1fr;
    }
    
    .tech-grid {
        grid-template-columns: 1fr;
    }
    
    .tech-highlights {
        grid-template-columns: 1fr;
    }
    
    .download-content {
        flex-direction: column;
        text-align: center;
    }
    
    .download-stats {
        justify-content: center;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: rgba(15, 10, 26, 0.98);
        flex-direction: column;
        padding: 24px;
        gap: 16px;
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition-normal);
    }
    
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .hamburger {
        display: flex;
    }
    
    .nav-download-btn {
        display: none;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.2rem;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: 20px;
    }
    
    .hero-cta {
        flex-direction: column;
    }
    
    .app-mockup {
        width: 300px;
    }
    
    .analysis-grid {
        grid-template-columns: 1fr;
    }
    
    .analysis-card.main-card {
        grid-column: span 1;
    }
    
    .library-stats {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .vocal-features {
        grid-template-columns: 1fr;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
        gap: 24px;
    }
    
    .beian {
        flex-direction: column;
        gap: 8px;
    }
    
    .divider {
        display: none;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .section-title {
        font-size: 1.8rem;
    }
    
    .library-stats {
        grid-template-columns: 1fr;
    }
    
    .pitch-wheel {
        width: 240px;
        height: 240px;
    }
    
    .app-mockup {
        width: 280px;
    }
}

/* SVG 渐变定义 */
svg defs {
    display: none;
}