:root {
    --main-bg: #ffffff;
    --dark-bg: #000000;
    --accent-green: #2acc72;
    --accent-green-hover: #21a866;
    --text-main: #111111;
    --text-muted: #666666;
    --text-light: #ededed;
}

body {
    margin: 0;
    padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
    background-color: var(--main-bg);
    color: var(--text-main);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

a { text-decoration: none !important; color: inherit; transition: all 0.2s ease; }
img { max-width: 100%; height: auto; display: block; }

/* 响应式标准布局基础 */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    box-sizing: border-box;
}

.flex-grid {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
}

.col-6 {
    flex: 1;
    min-width: 340px;
    box-sizing: border-box;
    padding: 20px;
}


.site-header {
    background-color: #000000; 
    padding: 12px 0;
    position: relative;
    z-index: 100;
    border-bottom: 1px solid #111111; 
}

.header-wrap {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.brand-logo img {
    height: 42px;
    width: auto;
}

.main-nav ul {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    gap: 24px;
}

.main-nav ul li a {
    color: #ffffff; 
    font-size: 15px;
    font-weight: 600;
    opacity: 0.85;
}

.main-nav ul li a:hover, .main-nav ul li.active a {
    opacity: 1;
    color: var(--accent-green);
}


.hero-section {
    background-color: #f8f9fa; 
    color: #111111; 
    padding: 60px 0 80px 0;
    position: relative;
}

.hero-title {
    font-size: 46px;
    font-weight: 800;
    line-height: 1.25;
    margin: 0 0 20px 0;
    color: #111111; 
}

.hero-desc {
    font-size: 16px;
    color: #555555; 
    margin-bottom: 35px;
    max-width: 520px;
}

/* 并排切图小微标按钮 */
.badge-btn-group {
    display: flex;
    gap: 15px;
    margin-bottom: 40px;
}

.badge-btn img {
    height: 48px;
    width: auto;
    border-radius: 4px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.badge-btn:hover img {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(0,0,0,0.25);
}


.service-section {
    padding: 80px 0;
    background-color: #f8f9fa; 
    border-bottom: 1px solid #eeeeee;
}

.service-title {
    font-size: 32px;
    font-weight: 700;
    color: var(--text-main);
    margin: 0 0 15px 0;
}

.service-desc {
    font-size: 15px;
    color: var(--text-muted);
    max-width: 550px;
    margin: 0;
}


.download-section {
    background-color: #080808;
    color: #ffffff;
    padding: 50px 0;
    text-align: center;
}

.download-wrap {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 30px;
}

.download-text {
    font-size: 24px;
    font-weight: 600;
    text-align: left;
}


.btn-action-green {
    display: inline-block;
    background-color: var(--accent-green);
    color: #ffffff;
    font-size: 16px;
    font-weight: 700;
    border-radius: 30px;
    box-shadow: 0 4px 15px rgba(42, 204, 114, 0.3);
    text-align: center;
    letter-spacing: 2px;
    white-space: nowrap;
    transition: all 0.2s ease;
    box-sizing: border-box;
    width: 360px !important;       
    padding: 15px 0px !important;  
}

.btn-action-green:hover {
    background-color: var(--accent-green-hover);
    transform: scale(1.02);
    box-shadow: 0 6px 20px rgba(42, 204, 114, 0.4);
}


.site-footer {
    background-color: var(--dark-bg);
    padding: 35px 0;
    color: #888888;
    font-size: 13px;
    border-top: 1px solid #111111;
}

.footer-links { margin-bottom: 12px; }
.footer-links a { margin-right: 15px; }
.footer-links a:hover { color: #ffffff; }


@media screen and (max-width: 768px) {
    .flex-grid { flex-direction: column; text-align: center; }
    .col-6 { width: 100%; padding: 10px 0; }
    .hero-section { padding: 40px 0; }
    .hero-title { font-size: 32px; text-align: center; }
    .hero-desc { text-align: center; margin: 0 auto 30px auto; }
    .badge-btn-group { justify-content: center; }
    
    .service-section { padding: 50px 0; }
    .service-title { font-size: 26px; text-align: center; }
    .service-desc { text-align: center; margin: 0 auto; }
    

    .download-wrap { flex-direction: column; text-align: center; justify-content: center; }
    .download-text { text-align: center; font-size: 20px; width: 100%; }
    

    .download-wrap > div {
        width: 100% !important;
        display: block !important;
        text-align: center !important;
    }
    

    .btn-action-green { 
        width: 85% !important; 
        padding: 14px 0 !important; 
        font-size: 15px !important;
        display: inline-block !important;
        margin: 0 auto !important;
    }
    
    .site-footer { text-align: center; }
    .main-nav { display: none; }
}