/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #4a9fd4;
    --primary-dark: #3d8fc4;
    --secondary-color: #5fb0e5;
    --text-primary: #1a1a1a;
    --text-secondary: #666;
    --text-muted: #999;
    --bg-light: #f8fafc;
    --bg-white: #ffffff;
    --border-color: #e5e7eb;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 25px rgba(0,0,0,0.1);
    --shadow-xl: 0 20px 40px rgba(0,0,0,0.15);
    --gradient-primary: linear-gradient(135deg, #4a9fd4 0%, #5fb0e5 100%);
    --gradient-hero: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Microsoft YaHei', 'PingFang SC', sans-serif;
    color: var(--text-primary);
    background: var(--bg-light);
    line-height: 1.6;
}

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

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: all 0.3s ease;
}

.nav-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
}

.nav-brand .logo {
    width: 40px;
    height: 40px;
    object-fit: contain;
}

.brand-name {
    position: relative;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 40px;
}

.nav-menu a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 15px;
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: width 0.3s ease;
}

.nav-menu a:hover {
    color: var(--primary-color);
}

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

.download-btn {
    padding: 10px 24px;
    background: var(--gradient-primary);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-md);
}

.download-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* 英雄区 */
.hero {
    padding: 140px 0 80px;
    background: linear-gradient(135deg, #f8fafc 0%, #e8eef5 100%);
}

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

.hero-text {
    animation: fadeInLeft 0.8s ease;
}

@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.hero-title {
    font-size: 56px;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 24px;
    color: var(--text-primary);
}

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

.hero-subtitle {
    font-size: 20px;
    color: var(--text-secondary);
    margin-bottom: 40px;
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    margin-bottom: 60px;
}

.btn {
    padding: 14px 32px;
    border-radius: 10px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    border: none;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

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

.hero-stats {
    display: flex;
    gap: 48px;
}

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

.stat-number {
    font-size: 32px;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 14px;
    color: var(--text-muted);
    margin-top: 4px;
}

.hero-image {
    animation: fadeInRight 0.8s ease;
}

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

.hero-card {
    background: white;
    border-radius: 20px;
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    transform: perspective(1000px) rotateY(-5deg);
    transition: transform 0.3s ease;
}

.hero-card:hover {
    transform: perspective(1000px) rotateY(0deg);
}

.card-header {
    padding: 16px 20px;
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    display: flex;
    align-items: center;
    gap: 12px;
}

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

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.dot.red { background: #ff5f56; }
.dot.yellow { background: #ffbd2e; }
.dot.green { background: #27c93f; }

.card-title {
    color: white;
    font-weight: 600;
    font-size: 14px;
}

.card-body {
    padding: 24px;
}

.preview-window {
    background: linear-gradient(135deg, #f8fafc 0%, #e8eef5 100%);
    border-radius: 12px;
    padding: 24px;
}

.music-card {
    background: white;
    border-radius: 12px;
    padding: 20px;
    display: flex;
    align-items: center;
    gap: 16px;
    box-shadow: var(--shadow-md);
    margin-bottom: 16px;
}

.music-cover-svg {
    width: 60px;
    height: 60px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #fff;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.music-cover-svg svg {
    width: 100%;
    height: 100%;
}

.music-cover-img {
    width: 60px;
    height: 60px;
    border-radius: 10px;
    object-fit: cover;
    box-shadow: 0 2px 8px rgba(0,0,0,0.15);
}

.music-info {
    flex: 1;
}

.music-title {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

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

.progress-bar {
    height: 6px;
    background: rgba(0,0,0,0.1);
    border-radius: 3px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    width: 60%;
    background: var(--gradient-primary);
    animation: progress 2s ease-in-out infinite;
}

@keyframes progress {
    0%, 100% { width: 60%; }
    50% { width: 80%; }
}

/* 功能特色 */
.features {
    padding: 100px 0;
    background: white;
}

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

.section-title {
    font-size: 42px;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.section-subtitle {
    font-size: 18px;
    color: var(--text-secondary);
}

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

.feature-card {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 36px 28px;
    transition: all 0.3s ease;
    cursor: default;
    position: relative;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
    border-radius: 16px 16px 0 0;
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

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

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.feature-title {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-primary);
    position: relative;
    padding-left: 16px;
}

.feature-title::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 6px;
    height: 6px;
    background: var(--primary-color);
    border-radius: 50%;
}

.feature-desc {
    color: var(--text-secondary);
    margin-bottom: 20px;
    line-height: 1.7;
}

.feature-list {
    list-style: none;
}

.feature-list li {
    padding: 8px 0;
    padding-left: 24px;
    color: var(--text-secondary);
    position: relative;
    font-size: 14px;
}

.feature-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
}

/* 工具集 */
.tools {
    padding: 100px 0;
    background: linear-gradient(135deg, #f8fafc 0%, #e8eef5 100%);
}

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

.tool-item {
    background: white;
    border-radius: 16px;
    padding: 28px;
    display: flex;
    align-items: center;
    gap: 20px;
    text-decoration: none;
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
}

.tool-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--gradient-primary);
    transform: scaleY(0);
    transition: transform 0.3s ease;
}

.tool-item:hover::before {
    transform: scaleY(1);
}

.tool-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.tool-logo {
    width: 60px;
    height: 60px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    overflow: hidden;
    background: #f5f5f5;
}

.tool-logo img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.tool-logo-text {
    font-size: 16px;
    font-weight: 600;
    color: var(--primary-color);
}

.tool-info {
    flex: 1;
}

.tool-info h4 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 6px;
}

.tool-info p {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.5;
}

.tool-arrow {
    font-size: 20px;
    color: var(--text-muted);
    opacity: 0;
    transform: translateX(-10px);
    transition: all 0.3s ease;
}

.tool-item:hover .tool-arrow {
    opacity: 1;
    transform: translateX(0);
}

/* 下载区 */
.download {
    padding: 100px 0;
    background: white;
}

.download-card {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    border-radius: 24px;
    padding: 60px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    box-shadow: var(--shadow-xl);
    color: white;
}

.download-title {
    font-size: 42px;
    font-weight: 700;
    margin-bottom: 12px;
}

.download-subtitle {
    font-size: 18px;
    opacity: 0.9;
    margin-bottom: 32px;
}

.download-info {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-bottom: 40px;
}

.info-item {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.info-label {
    font-size: 14px;
    opacity: 0.8;
}

.info-value {
    font-size: 20px;
    font-weight: 600;
}

.btn-download {
    background: white;
    color: var(--primary-color);
    padding: 16px 40px;
    border-radius: 12px;
    font-size: 18px;
    font-weight: 600;
    border: none;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    transition: all 0.3s ease;
    margin-bottom: 16px;
}

.btn-download:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

.download-note {
    font-size: 14px;
    opacity: 0.8;
}

.download-features h3 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 24px;
}

.download-features ul {
    list-style: none;
}

.download-features li {
    padding: 12px 0;
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 16px;
}

.download-features svg {
    stroke: white;
    stroke-width: 2;
    fill: none;
}

/* 页脚 */
.footer {
    background: var(--text-primary);
    color: white;
    padding: 60px 0 40px;
}

.footer-content {
    text-align: center;
}

.footer-brand {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 16px;
}

.footer-brand .logo {
    width: 32px;
    height: 32px;
    object-fit: contain;
    opacity: 0.9;
}

.footer-text {
    font-size: 16px;
    opacity: 0.8;
    margin-bottom: 24px;
}

.footer-copyright {
    font-size: 14px;
    opacity: 0.6;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .hero-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .hero-title {
        font-size: 36px;
    }
    
    .hero-image {
        order: -1;
    }
    
    .features-grid,
    .tools-grid {
        grid-template-columns: 1fr;
    }
    
    .download-card {
        grid-template-columns: 1fr;
        padding: 40px 28px;
    }
}