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

:root {
    --primary-color: #559EE8;
    --primary-dark: #3d7cc9;
    --text-color: #333;
    --text-light: #666;
    --bg-light: #CCFFFF;
    --bg-white: #fff;
    --accent-red: #FF0000;
    --accent-blue: #000099;
    --border-color: #C0C0C0;
    --link-color: #165392;
    --link-hover: #fd6600;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Microsoft YaHei', 'PingFang SC', 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-light);
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100vh;
}

a {
    color: var(--link-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: var(--link-hover);
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 15px;
}

header {
    background-color: var(--primary-color);
    padding: 0;
}

.header-top {
    background-color: var(--bg-light);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 20px;
    flex-wrap: wrap;
    gap: 15px;
}

.logo-section {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-section img {
    max-height: 60px;
    width: auto;
}

.header-links {
    display: flex;
    flex-direction: column;
    gap: 5px;
    font-size: 14px;
}

.header-links a {
    display: flex;
    align-items: center;
    gap: 5px;
    color: var(--text-color);
}

.header-links img {
    width: 14px;
    height: 14px;
}

.nav-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 20px;
    flex-wrap: wrap;
    gap: 10px;
}

.date-display {
    color: #000;
    font-size: 14px;
}

.nav-menu {
    display: flex;
    gap: 5px;
    flex-wrap: wrap;
}

.nav-menu a {
    color: #fff;
    padding: 8px 15px;
    border-radius: 4px;
    transition: background-color 0.3s ease;
    font-size: 14px;
}

.nav-menu a:hover {
    background-color: var(--primary-dark);
    color: #fff;
}

main {
    padding: 20px 0;
}

.hero-section {
    text-align: center;
    padding: 30px 20px;
    background-color: var(--bg-light);
    margin-bottom: 20px;
    border-radius: 8px;
}

.hero-title {
    font-family: 'STXingkai', '华文行楷', cursive;
    font-size: 2rem;
    color: var(--accent-blue);
    margin-bottom: 20px;
}

.product-intro {
    background-color: var(--bg-light);
    padding: 25px;
    margin-bottom: 20px;
    border-radius: 8px;
}

.section-title {
    font-family: 'FZHei-B01', '方正粗黑宋简体', sans-serif;
    font-size: 1.5rem;
    color: var(--accent-red);
    margin-bottom: 15px;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 10px;
}

.product-intro p {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--text-color);
}

.important-notice {
    background-color: var(--bg-light);
    padding: 25px;
    margin-bottom: 20px;
    border-radius: 8px;
}

.notice-title {
    font-family: 'FZHei-B01', '方正粗黑宋简体', sans-serif;
    font-size: 1.5rem;
    color: var(--accent-red);
    margin-bottom: 15px;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 10px;
}

.notice-content {
    font-size: 1.1rem;
    line-height: 1.8;
}

.download-section {
    background-color: var(--bg-light);
    padding: 25px;
    margin-bottom: 20px;
    border-radius: 8px;
}

.download-item {
    margin: 15px 0;
    font-size: 1.1rem;
}

.download-item a {
    color: var(--link-color);
    font-weight: bold;
}

.download-item a:hover {
    text-decoration: underline;
}

.product-story {
    background-color: var(--bg-light);
    padding: 25px;
    margin-bottom: 20px;
    border-radius: 8px;
}

.story-content {
    font-size: 1.1rem;
    line-height: 2;
}

.story-content p {
    margin-bottom: 15px;
}

.upgrade-section {
    background-color: var(--bg-light);
    padding: 25px;
    margin-bottom: 20px;
    border-radius: 8px;
}

.upgrade-image {
    width: 100%;
    max-width: 971px;
    height: auto;
    border-radius: 8px;
    margin-top: 20px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

footer {
    background-color: var(--bg-light);
    padding: 30px 20px;
    text-align: center;
    border-top: 1px solid var(--border-color);
}

.contact-info {
    margin-bottom: 20px;
    line-height: 2;
}

.contact-info strong {
    color: var(--text-color);
}

.contact-info span {
    color: #003399;
}

.footer-bottom {
    color: var(--text-light);
    font-size: 14px;
}

.footer-bottom a {
    color: #0066FF;
}

.divider {
    border: none;
    border-top: 1px solid var(--border-color);
    margin: 20px 0;
}

.qq-icon {
    vertical-align: middle;
    border: none;
}

@media screen and (max-width: 768px) {
    .header-top {
        flex-direction: column;
        text-align: center;
    }
    
    .logo-section {
        flex-direction: column;
    }
    
    .nav-bar {
        flex-direction: column;
        text-align: center;
    }
    
    .nav-menu {
        justify-content: center;
    }
    
    .hero-title {
        font-size: 1.5rem;
    }
    
    .section-title {
        font-size: 1.25rem;
    }
    
    .product-intro p,
    .notice-content,
    .download-item,
    .story-content {
        font-size: 1rem;
    }
    
    .container {
        padding: 0 10px;
    }
}

@media screen and (max-width: 480px) {
    .nav-menu a {
        padding: 6px 10px;
        font-size: 12px;
    }
    
    .hero-title {
        font-size: 1.25rem;
    }
    
    .header-links {
        font-size: 12px;
    }
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}