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

body {
    font-family: -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
    color: #333;
    line-height: 1.6;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.header {
    background: #fff;
    border-bottom: 1px solid #eee;
    position: sticky;
    top: 0;
}
.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 60px;
}
.logo {
    font-size: 20px;
    font-weight: 700;
    color: #1a73e8;
    text-decoration: none;
}
.menu a {
    margin-left: 24px;
    color: #555;
    text-decoration: none;
    font-size: 14px;
}
.menu a:hover { color: #1a73e8; }

/* Hero */
.hero {
    background: linear-gradient(135deg, #1a73e8, #4285f4);
    color: #fff;
    padding: 80px 0;
    text-align: center;
}
.hero h1 {
    font-size: 36px;
    margin-bottom: 16px;
}
.hero .subtitle {
    font-size: 16px;
    opacity: 0.9;
    margin-bottom: 32px;
}
.btn {
    display: inline-block;
    background: #fff;
    color: #1a73e8;
    padding: 12px 32px;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 600;
}
.btn:hover { opacity: 0.9; }

/* Sections */
.section {
    padding: 60px 0;
}
.section.alt {
    background: #f8f9fa;
}
.section h2 {
    font-size: 26px;
    margin-bottom: 16px;
    text-align: center;
}
.section .desc {
    color: #666;
    text-align: center;
    margin-bottom: 32px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* Features */
.features {
    display: flex;
    gap: 24px;
    justify-content: center;
    flex-wrap: wrap;
}
.feature {
    flex: 1;
    min-width: 200px;
    max-width: 260px;
    background: #fff;
    padding: 28px 20px;
    border-radius: 8px;
    text-align: center;
    border: 1px solid #eee;
}
.feature .icon {
    font-size: 36px;
    margin-bottom: 12px;
}
.feature h3 {
    font-size: 16px;
    margin-bottom: 8px;
}
.feature p {
    font-size: 14px;
    color: #666;
}

/* Download */
.download {
    display: flex;
    gap: 40px;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
}
.qrcode {
    text-align: center;
}
.qr-placeholder {
    width: 140px;
    height: 140px;
    background: #fff;
    border: 1px solid #ddd;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #999;
    margin-bottom: 8px;
}
.download-links {
    display: flex;
    flex-direction: column;
    gap: 12px;
}
.dl-link {
    display: flex;
    align-items: center;
    gap: 10px;
    background: #fff;
    padding: 12px 20px;
    border-radius: 6px;
    text-decoration: none;
    color: #333;
    font-size: 14px;
    border: 1px solid #eee;
}
.dl-link:hover { border-color: #1a73e8; }

/* About */
.about-content {
    max-width: 600px;
    margin: 0 auto;
    color: #555;
}
.about-content p {
    margin-bottom: 16px;
}

/* Contact */
.contact-info {
    text-align: center;
    color: #555;
}
.contact-info p {
    margin: 8px 0;
}

/* Footer */
.footer {
    background: #333;
    color: #aaa;
    text-align: center;
    padding: 24px 0;
    font-size: 13px;
}
.footer p {
    margin: 4px 0;
}