body {
    font-family: "微软雅黑", Arial, sans-serif;
    margin: 0;
    padding: 0;
    background: #f9f9f9;
    color: #000000;
}

 header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: #ffc300;
    color: #fff;
    padding: 10px 5%;
    min-height: 60px;
}

.logo {
    display: flex;
    align-items: center;
}

.logo img {
    height: 50px;
}

.company-name {
    font-size: 20px;
    color: #0d131a;
    margin-left: 16px;
    font-weight: bold;
    letter-spacing: 2px;
    white-space: nowrap;
}

nav a {
    color: #444;
    text-decoration: none;
    margin: 0 18px;
    font-size: 16px;
    font-weight: 500;
    padding: 8px 16px;
    border-radius: 6px;
    transition: .2s;
}

nav a.active,
nav a:hover {
    background: #fff5d4;
    color: #ea9300;
    font-weight: bold;
}

.banner {
    text-align: center;
    background: #ba0d36;
    color: #ffffff;
    padding: 60px 10px;
}

section {
    max-width: 1000px;
    margin: 50px auto;
    padding: 0 20px;
    background: #fff;
    border-radius: 10px;
    box-shadow: 0 2px 12px #eaeaea;
}

h2 {
    border-left: 5px solid #ffc300;
    padding-left: 5px;
}

.product-list {
    display: flex;
    flex-wrap: wrap;
    gap: 30px;
}

.product-item {
    flex: 1 1 220px;
    background: #f5f7fa;
    border-radius: 8px;
    padding: 15px;
    text-align: center;
    box-shadow: 0 2px 8px #ececec;
}

.product-item img {
    max-width: 100%;
    border-radius: 8px;
}

.btn {
    display: inline-block;
    padding: 8px 18px;
    margin: 8px;
    background: #0d131a;
    color: #fff;
    border-radius: 5px;
    text-decoration: none;
}

.btn:hover {
    background: #1abc9c;
}

.app-download {
    display: flex;
    align-items: center;
    gap: 40px;
}

.app-download img {
    width: 120px;
}

footer {
    text-align: center;
    color: #666;
    padding: 20px 0;
    margin-top: 40px;
}

@media (max-width: 800px) {
    .product-list {
        flex-direction: column;
    }

    .app-download {
        flex-direction: column;
        align-items: flex-start;
    }

    section {
        margin: 20px 0;
    }
}

.ppt-slider {
    text-align: center;
    margin: 20px auto;
}

.ppt-slider img {
    max-width: 90%;
    max-height: 480px;
    border-radius: 12px;
    box-shadow: 0 4px 20px #eaeaea;
    background: #fff;
}

.ppt-controls {
    margin-top: 10px;
}

.ppt-controls button {
    background: #ffc300;
    border: none;
    padding: 6px 20px;
    margin: 0 16px;
    font-size: 16px;
    border-radius: 5px;
    cursor: pointer;
    color: #fff;
}

.ppt-controls button:hover {
    background: #0d131a;
}

#ppt-page {
    font-weight: bold;
    font-size: 16px;
}

.ppt-dots {
    margin: 18px 0 0 0;
    text-align: center;
}

.ppt-dot {
    display: inline-block;
    width: 14px;
    height: 14px;
    margin: 0 6px;
    border-radius: 50%;
    background: #e0e0e0;
    cursor: pointer;
    transition: background 0.3s;
    vertical-align: middle;
    border: 2px solid #fff;
    box-shadow: 0 0 2px #bbb;
}

.ppt-dot-active {
    background: #ffc300;
    border: 2px solid #ff7c00;
    box-shadow: 0 0 6px #ffc300;
}

html {
    scroll-behavior: smooth;
}