/* 全局重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* 全局样式 */
body {
    font-family: "Microsoft YaHei", "PingFang SC", sans-serif;
    font-size: 16px;
    line-height: 1.65;
    color: #333;
    background-color: #f8f9fa;
}

.container {
    width: 92%;
    max-width: 1200px;
    margin: 0 auto;
}

/* 字体层级规范 */
h1 {
    font-size: 1.6rem;
    font-weight: 700;
    color: #222;
    text-align: center;
    margin-bottom: 0;
}

h2 {
    font-size: 2.2rem;
    font-weight: 600;
    color: #1967d2;
    text-align: center;
    margin-bottom: 1.2rem;
}

h3 {
    font-size: 1.8rem;
    font-weight: 600;
    color: #2d3748;
    text-align: center;
    margin-bottom: 1.5rem;
    position: relative;
    padding-bottom: 0.8rem;
}

h3::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 3px;
    background: linear-gradient(90deg, #1967d2, #4285f4);
    border-radius: 3px;
}

h4 {
    font-size: 1.3rem;
    font-weight: 600;
    color: #2d3748;
    text-align: center;
    margin-bottom: 1rem;
}

p {
    text-align: left;
    margin-bottom: 1rem;
    color: #4a5568;
    line-height: 1.7;
}

a {
    text-decoration: none;
    color: #1967d2;
    transition: all 0.3s ease-in-out;
}

a:hover {
    color: #0d47a1;
}

/* 页头样式 */
.header {
    background-color: #ffffff;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.06);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 999;
}

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

.header-logo h1 {
    color: #1967d2;
}

/* 汉堡按钮样式 */
.hamburger-btn {
    display: none;
    cursor: pointer;
    width: 44px;
    height: 44px;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    background-color: #f5f7fa;
    transition: background-color 0.3s ease;
}

.hamburger-btn:hover {
    background-color: #e8f0fe;
}

.hamburger-icon {
    width: 30px;
    height: 30px;
    object-fit: contain;
}

/* 导航菜单样式 */
.header-nav ul {
    display: flex;
    list-style: none;
    gap: 2.2rem;
}

.header-nav a {
    color: #2d3748;
    padding: 0.6rem 0;
    position: relative;
    font-size: 1rem;
}

.header-nav a::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, #1967d2, #4285f4);
    transition: width 0.3s ease;
}

.header-nav a:hover::after {
    width: 100%;
}

/* 英雄区样式 */
.hero {
    background: linear-gradient(135deg, #e8f0fe 0%, #f1f8fe 100%);
    padding: 4.5rem 0;
    text-align: center;
    margin-bottom: 3.5rem;
    border-radius: 0 0 24px 24px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
}

.hero p {
    text-align: center;
    font-size: 1.15rem;
    max-width: 850px;
    margin: 0 auto;
    color: #4a5568;
}

/* 技术支持区块样式 */
.tech-support {
    padding: 3.5rem 0;
    margin-bottom: 3.5rem;
}

.support-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.support-item {
    background-color: #ffffff;
    padding: 2.2rem;
    border-radius: 16px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.07);
    transition: all 0.4s ease;
    border: 1px solid #f0f4f8;
}

.support-item:hover {
    transform: translateY(-6px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.12);
    border-color: #e8f0fe;
}

/* 熵澜体育介绍区块 */
.company-intro {
    padding: 3.5rem 0;
    background-color: #ffffff;
    margin-bottom: 3.5rem;
    border-radius: 16px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
}

.intro-content {
    max-width: 950px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* APP下载区块样式 */
.download-section {
    padding: 3.5rem 0;
    text-align: center;
    background: linear-gradient(135deg, #1967d2 0%, #4285f4 100%);
    color: #ffffff;
    border-radius: 16px;
    margin-bottom: 3.5rem;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.download-section h3, .download-section p {
    color: #ffffff;
    text-align: center;
}

.download-btn {
    display: inline-block;
    padding: 1.1rem 2.8rem;
    background-color: #ffffff;
    color: #1967d2;
    border-radius: 10px;
    font-weight: 600;
    margin-top: 1.8rem;
    box-shadow: 0 5px 12px rgba(0, 0, 0, 0.12);
    transition: all 0.3s ease;
    font-size: 1.05rem;
}

.download-btn:hover {
    background-color: #f8fafc;
    transform: translateY(-4px);
    box-shadow: 0 8px 18px rgba(0, 0, 0, 0.15);
    color: #0d47a1;
}

/* 页尾样式 */
.footer {
    background-color: #2d3748;
    color: #ffffff;
    padding: 3.5rem 0 2rem;
}

.footer-main {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2.5rem;
    margin-bottom: 2.5rem;
}

.footer-col h4 {
    color: #ffffff;
    border-bottom: 2px solid #4285f4;
    padding-bottom: 0.8rem;
    margin-bottom: 1.2rem;
    text-align: left;
    font-size: 1.2rem;
}

.footer-col ul {
    list-style: none;
}

.footer-col li {
    margin-bottom: 1rem;
}

.footer-col a {
    color: #e2e8f0;
    font-size: 0.95rem;
}

.footer-col a:hover {
    color: #4285f4;
}

.qrcode img {
    width: 130px;
    height: 130px;
    border-radius: 10px;
    border: 3px solid #ffffff;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 2.2rem;
    padding: 1.8rem 0;
    border-top: 1px solid #4a5568;
    border-bottom: 1px solid #4a5568;
    margin-bottom: 1.8rem;
    flex-wrap: wrap;
}

.footer-links a {
    color: #e2e8f0;
    font-size: 0.95rem;
}

.footer-links a:hover {
    color: #4285f4;
}

.footer-copyright {
    text-align: center;
    color: #a0aec0;
    font-size: 0.9rem;
}

/* 响应式样式 - 平板/移动端（768px以下） */
@media (max-width: 768px) {
    /* 汉堡按钮显示 */
    .hamburger-btn {
        display: flex;
    }

    /* 导航菜单默认隐藏 */
    .header-nav {
        position: fixed;
        top: 0;
        right: 0;
        width: 82%;
        height: 100vh;
        background-color: #ffffff;
        padding: 3.5rem 2rem;
        transform: translateX(100%);
        transition: transform 0.35s ease-out;
        z-index: 998;
        box-shadow: -3px 0 10px rgba(0, 0, 0, 0.1);
        overflow-y: auto;
    }

    .header-nav.active {
        transform: translateX(0);
    }

    .header-nav ul {
        flex-direction: column;
        gap: 0;
    }

    .header-nav li {
        background-color: #f5f7fa;
        padding: 1.2rem 1rem;
        border-radius: 10px;
        margin-bottom: 1rem;
    }

    /* 字体适配 */
    h2 {
        font-size: 1.8rem;
    }

    h3 {
        font-size: 1.5rem;
    }

    /* 核心区块适配 */
    .support-list {
        grid-template-columns: 1fr;
    }

    /* 页尾主分类适配 - 一行两个 */
    .footer-main {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.8rem;
    }

    /* 页尾链接适配 */
    .footer-links {
        gap: 1.2rem;
        padding: 1.2rem 0;
    }

    .footer-links a {
        flex: 1 1 40%;
        text-align: center;
        padding: 0.6rem 0;
    }

    /* 英雄区适配 */
    .hero {
        padding: 3rem 0;
    }
}

/* 小屏移动端（480px以下） */
@media (max-width: 480px) {
    .footer-main {
        grid-template-columns: 1fr;
    }

    .download-btn {
        width: 90%;
    }

    .support-item {
        padding: 1.8rem;
    }

    h1 {
        font-size: 1.4rem;
    }
}