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

body {
    font-family: 'Microsoft YaHei', 'PingFang SC', 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

.header {
    text-align: center;
    padding: 60px 0;
    color: white;
}

.logo-img {
    width: 220px;
    max-width: 60%;
    height: auto;
    display: inline-block;
    margin-bottom: 30px;
    filter: drop-shadow(0 6px 12px rgba(0,0,0,0.25));
}

.header h1 {
    font-size: 3rem;
    margin-bottom: 20px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.header h2 {
    font-size: 1.5rem;
    margin-bottom: 40px;
    font-weight: 300;
    opacity: 0.9;
}

.subtitle {
    font-size: 1.1rem;
    margin-bottom: 30px;
    opacity: 0.9;
}

.download-buttons {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 12px;
    flex-wrap: wrap;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    padding: 10px 38px;
    background: #3B6CFF;
    color: #fff;
    text-decoration: none;
    border-radius: 9999px;
    font-size: 1.05rem;
    font-weight: 700;
    letter-spacing: 0.5px;
    transition: all 0.25s ease;
    box-shadow: 0 8px 18px rgba(0,0,0,0.18);
    border: 1px solid rgba(255,255,255,0.25);
}

.download-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 14px 22px rgba(0,0,0,0.25);
    filter: brightness(1.02);
}

.download-btn .icon {
    font-size: 1.2rem;
    margin-right: 10px;
}

.main-content {
    background: white;
    border-radius: 20px;
    padding: 60px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
    margin-bottom: 40px;
}

.highlight-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
    align-items: center;
}

.highlight-item {
    background: #f8f9fa;
    border-radius: 18px;
    padding: 24px 32px;
    border: 1px solid #e9ecef;
    box-shadow: 0 12px 24px rgba(102, 126, 234, 0.12);
    max-width: 520px;
    width: 100%;
    display: flex;
    align-items: flex-start;
    gap: 16px;
    text-align: left;
}

.highlight-icon {
    font-size: 2rem;
    line-height: 1;
    color: #3B6CFF;
    font-weight: 700;
    margin-top: 2px;
}

.highlight-text {
    flex: 1;
}

.highlight-item .cn {
    font-size: 1.6rem;
    font-weight: 700;
    color: #333;
    margin-bottom: 6px;
}

.highlight-item .en {
    font-size: 1rem;
    color: #666;
    letter-spacing: 0.3px;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 50px;
    color: #333;
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, #667eea, #764ba2);
    border-radius: 2px;
}

.intro {
    text-align: center;
    font-size: 1.2rem;
    margin-bottom: 40px;
    color: #666;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
    margin-bottom: 60px;
}

.feature-card {
    background: #f8f9fa;
    padding: 40px 30px;
    border-radius: 15px;
    text-align: center;
    transition: all 0.3s ease;
    border: 1px solid #e9ecef;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.1);
}

.feature-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-size: 2rem;
    color: white;
}

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: #333;
}

.feature-card p {
    color: #666;
    line-height: 1.8;
}

.screenshots {
    text-align: center;
}

.screenshots h3 {
    font-size: 2rem;
    margin-bottom: 30px;
    color: #333;
}

.screenshots p {
    color: #666;
    margin-bottom: 30px;
}

.screenshots-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-top: 40px;
}

.screenshot-item {
    background: #f8f9fa;
    padding: 20px;
    border-radius: 15px;
    border: 1px solid #e9ecef;
}

.screenshot-placeholder {
    width: 100%;
    height: 200px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.2rem;
    margin-bottom: 15px;
}

.qr-section {
    background: white;
    border-radius: 20px;
    padding: 40px;
    text-align: center;
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
    margin-bottom: 40px;
}

.qr-section h3 {
    font-size: 2rem;
    margin-bottom: 20px;
    color: #333;
}

.qr-section p {
    color: #666;
    margin-bottom: 20px;
}

.qr-code {
    width: 200px;
    height: 200px;
    background: #f8f9fa;
    border: 2px solid #e9ecef;
    border-radius: 10px;
    margin: 20px auto;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.9rem;
    color: #666;
}

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

.qr-placeholder p:first-child {
    font-size: 1rem;
    margin-bottom: 10px;
}

.qr-placeholder p:last-child {
    font-size: 0.8rem;
    color: #999;
}

.qr-info {
    margin-top: 20px;
    text-align: center;
}

.qr-info a {
    color: #667eea;
    text-decoration: none;
    font-weight: 600;
}

.qr-info a:hover {
    text-decoration: underline;
}

.footer {
    text-align: center;
    padding: 40px 0;
    color: white;
    opacity: 0.8;
}

@media (max-width: 768px) {
    .main-content {
        padding: 30px 20px;
    }

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

    .highlight-list {
        gap: 20px;
    }

    .highlight-item {
        padding: 24px 20px;
        gap: 12px;
    }

    .highlight-icon {
        font-size: 1.6rem;
    }
}