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

:root {
    --primary-color: #2196F3;
    --primary-dark: #1976D2;
    --primary-light: #64B5F6;
    --accent-color: #FF4081;
    --text-primary: #212121;
    --text-secondary: #757575;
    --bg-light: #F5F7FA;
    --bg-white: #FFFFFF;
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.12);
    --shadow-lg: 0 8px 32px rgba(0,0,0,0.16);
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    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(255,255,255,0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(0,0,0,0.06);
    transition: all 0.3s ease;
}

.nav-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 64px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 20px;
    font-weight: 700;
    color: var(--primary-color);
}

.logo-icon {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 18px;
    background-image: url('images/logo.png');
    background-size: cover;
    background-position: center;

}

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

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

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

.nav-download {
    padding: 8px 20px;
    background: var(--primary-color);
    color: white !important;
    border-radius: 20px;
    transition: all 0.3s;
}

.nav-download:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

/* Hero区域 */
.hero {
    padding: 140px 0 100px;
    background: linear-gradient(135deg, #E3F2FD 0%, #BBDEFB 50%, #90CAF9 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(255,255,255,0.3) 0%, transparent 70%);
    border-radius: 50%;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(255,255,255,0.2) 0%, transparent 70%);
    border-radius: 50%;
}

.hero-inner {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-content h1 {
    font-size: 48px;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 20px;
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-content .subtitle {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 32px;
    line-height: 1.8;
}

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

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    border-radius: 30px;
    font-size: 16px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
    box-shadow: 0 4px 16px rgba(33, 150, 243, 0.4);
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(33, 150, 243, 0.5);
}

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

.btn-secondary:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
}

.hero-stats {
    display: flex;
    gap: 40px;
    margin-top: 48px;
}

.stat-item {
    text-align: left;
}

.stat-number {
    font-size: 28px;
    font-weight: 800;
    color: var(--primary-color);
}

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

.hero-phone {
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

.phone-mockup {
    width: 280px;
    height: 560px;
    background: white;
    border-radius: 36px;
    padding: 6px;
    box-shadow: var(--shadow-lg);
    position: relative;
    border: 2px solid #E0E0E0;
}

.phone-screen {
    width: 100%;
    height: 100%;
    background: var(--bg-white);
    border-radius: 30px;
    overflow: hidden;
    position: relative;
    background-image: url('images/screenshot-main.png');
    background-size: cover;
    background-position: center;

}

.phone-screen::before {
    display: none;
}

.phone-float-1, .phone-float-2 {
    position: absolute;
    background: white;
    border-radius: var(--radius-md);
    padding: 16px;
    box-shadow: var(--shadow-md);
    animation: float 3s ease-in-out infinite;
}

.phone-float-1 {
    top: 80px;
    left: -20px;
    animation-delay: 0s;
}

.phone-float-2 {
    bottom: 100px;
    right: -10px;
    animation-delay: 1.5s;
}

.float-icon {
    width: 40px;
    height: 40px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    margin-bottom: 8px;
}

.float-icon.music {
    background: #E8F5E9;
    color: #4CAF50;
}

.float-icon.lyric {
    background: #FFF3E0;
    color: #FF9800;
}

.float-text {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-primary);
}

.float-desc {
    font-size: 11px;
    color: var(--text-secondary);
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-12px); }
}

/* 特色功能区 */
.features {
    padding: 100px 0;
    background: var(--bg-white);
}

.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-tag {
    display: inline-block;
    padding: 6px 16px;
    background: #E3F2FD;
    color: var(--primary-color);
    border-radius: 20px;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 16px;
}

.section-title {
    font-size: 36px;
    font-weight: 800;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.section-desc {
    font-size: 16px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

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

.feature-card {
    padding: 32px;
    background: var(--bg-white);
    border-radius: var(--radius-md);
    border: 1px solid #ECEFF1;
    transition: all 0.3s ease;
    cursor: pointer;
}

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

.feature-icon {
    width: 56px;
    height: 56px;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    margin-bottom: 20px;
}

.feature-icon.blue {
    background: #E3F2FD;
    color: #2196F3;
}

.feature-icon.green {
    background: #E8F5E9;
    color: #4CAF50;
}

.feature-icon.orange {
    background: #FFF3E0;
    color: #FF9800;
}

.feature-icon.purple {
    background: #F3E5F5;
    color: #9C27B0;
}

.feature-icon.pink {
    background: #FCE4EC;
    color: #E91E63;
}

.feature-icon.cyan {
    background: #E0F7FA;
    color: #00BCD4;
}

.feature-title {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.feature-desc {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* 截图展示区 */
.screenshots {
    padding: 100px 0;
    background: var(--bg-light);
}

.screenshots-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    margin-top: 48px;
}

.screenshot-item {
    background: white;
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
    cursor: pointer;
}

.screenshot-item:hover {
    transform: scale(1.03);
    box-shadow: var(--shadow-md);
}

.screenshot-img {
    width: 100%;
    aspect-ratio: 9/16;
    background-size: cover;
    background-position: center;
}

.screenshot-img.s1 {
    background-image: url('images/screenshot-1.png');
    background-size: cover;
    background-position: center;
}
.screenshot-img.s2 {
    background-image: url('images/screenshot-2.png');
    background-size: cover;
    background-position: center;
}
.screenshot-img.s3 {
    background-image: url('images/screenshot-3.png');
    background-size: cover;
    background-position: center;
}
.screenshot-img.s4 {
    background-image: url('images/screenshot-4.png');
    background-size: cover;
    background-position: center;
}

.screenshot-label {
    padding: 16px;
    text-align: center;
    font-weight: 600;
    color: var(--text-primary);
    font-size: 14px;
}

/* 技术特点区 */
.tech {
    padding: 100px 0;
    background: var(--bg-white);
}

.tech-inner {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.tech-content h2 {
    font-size: 32px;
    font-weight: 800;
    margin-bottom: 24px;
}

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

.tech-item {
    display: flex;
    gap: 16px;
    padding: 16px 0;
    border-bottom: 1px solid #EEE;
}

.tech-item:last-child {
    border-bottom: none;
}

.tech-check {
    width: 24px;
    height: 24px;
    background: #E8F5E9;
    color: #4CAF50;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: 14px;
    font-weight: bold;
    margin-top: 2px;
}

.tech-text h4 {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 4px;
}

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

.tech-visual {
    position: relative;
    height: 400px;
}

.tech-card {
    position: absolute;
    background: white;
    border-radius: var(--radius-md);
    padding: 24px;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
}

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

.tech-card.card1 {
    top: 20px;
    left: 20px;
    width: 200px;
}

.tech-card.card2 {
    top: 80px;
    right: 40px;
    width: 180px;
}

.tech-card.card3 {
    bottom: 60px;
    left: 60px;
    width: 220px;
}

.tech-card-icon {
    font-size: 32px;
    margin-bottom: 12px;
}

.tech-card-title {
    font-weight: 700;
    font-size: 15px;
    margin-bottom: 4px;
}

.tech-card-desc {
    font-size: 12px;
    color: var(--text-secondary);
}

/* 下载区域 */
.download {
    padding: 100px 0;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    position: relative;
    overflow: hidden;
}

.download::before {
    content: '';
    position: absolute;
    top: -100px;
    right: -100px;
    width: 300px;
    height: 300px;
    background: rgba(255,255,255,0.1);
    border-radius: 50%;
}

.download::after {
    content: '';
    position: absolute;
    bottom: -80px;
    left: -80px;
    width: 250px;
    height: 250px;
    background: rgba(255,255,255,0.1);
    border-radius: 50%;
}

.download-inner {
    text-align: center;
    position: relative;
    z-index: 1;
}

.download h2 {
    font-size: 36px;
    font-weight: 800;
    color: white;
    margin-bottom: 16px;
}

.download p {
    font-size: 16px;
    color: rgba(255,255,255,0.85);
    margin-bottom: 40px;
}

.download-buttons {
    display: flex;
    justify-content: center;
    gap: 24px;
    flex-wrap: wrap;
}

.download-btn {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 32px;
    background: white;
    color: var(--primary-color);
    border-radius: var(--radius-md);
    text-decoration: none;
    transition: all 0.3s ease;
    font-weight: 600;
}

.download-btn:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0,0,0,0.2);
}

.download-btn-icon {
    font-size: 28px;
}

.download-btn-text {
    text-align: left;
}

.download-btn-text small {
    display: block;
    font-size: 11px;
    color: var(--text-secondary);
    font-weight: 500;
}

.download-btn-text span {
    font-size: 16px;
    font-weight: 700;
}

.qr-section {
    margin-top: 40px;
    display: flex;
    justify-content: center;
    gap: 40px;
    flex-wrap: wrap;
}

.qr-item {
    text-align: center;
}

.qr-code {
    width: 120px;
    height: 120px;
    background: white;
    border-radius: 12px;
    padding: 8px;
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    /* TODO: 替换为二维码图片 */
    /* 备注：此处替换为二维码图片
    background-image: url('images/qrcode.png');
    background-size: cover;
    background-position: center;
    */
}

.qr-code::before {
    content: '二维码';
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 500;
}

.qr-label {
    color: white;
    font-size: 14px;
    font-weight: 500;
}

/* 页脚 */
.footer {
    background: #1a1a1a;
    color: rgba(255,255,255,0.6);
    padding: 60px 0 24px;
}

.footer-inner {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 40px;
}

.footer-brand h3 {
    color: white;
    font-size: 20px;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.footer-brand p {
    font-size: 14px;
    line-height: 1.8;
}

.footer-col h4 {
    color: white;
    font-size: 15px;
    margin-bottom: 20px;
    font-weight: 600;
}

.footer-col ul {
    list-style: none;
}

.footer-col li {
    margin-bottom: 12px;
}

.footer-col a {
    color: rgba(255,255,255,0.6);
    text-decoration: none;
    font-size: 14px;
    transition: color 0.3s;
}

.footer-col a:hover {
    color: white;
}

.footer-bottom {
    padding-top: 24px;
    border-top: 1px solid rgba(255,255,255,0.1);
    text-align: center;
    font-size: 13px;
}

/* 响应式设计 */
@media (max-width: 968px) {
    .hero-inner {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-content h1 {
        font-size: 36px;
    }

    .hero-buttons {
        justify-content: center;
    }

    .hero-stats {
        justify-content: center;
    }

    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .screenshots-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .tech-inner {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .footer-inner {
        grid-template-columns: repeat(2, 1fr);
    }

    .nav-links {
        display: none;
    }
}

@media (max-width: 640px) {
    .hero-content h1 {
        font-size: 28px;
    }

    .section-title {
        font-size: 28px;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .screenshots-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .download-buttons {
        flex-direction: column;
        align-items: center;
    }

    .footer-inner {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .hero-stats {
        flex-direction: column;
        gap: 20px;
        align-items: center;
    }

    .stat-item {
        text-align: center;
    }
}

/* 滚动动画 */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}