/* 全局配色 严格按你要求 */
:root {
    --main: #ff6600;
    --main-dark: #ff5500;
    --sub: #333333;
    --ok: #00B42A;
    --bg: #F7F8FA;
    --white: #fff;
    --gray: #666;
    --light-gray: #999;
    --red: #f53f3f;
    --orange: #ff6600;
    --yellow: #ffc107;
}

* {
margin: 0;
padding: 0;
box-sizing: border-box;
font-family: "Microsoft YaHei", sans-serif;
}

body {
background: var(--bg);
color: var(--sub);
line-height: 1.6;
}

.container {
width: 1200px;
margin: 0 auto;
}

/* 导航 */
.nav {
background: #fff;
height: 70px;
box-shadow: 0 2px 10px rgba(0,0,0,0.05);
position: sticky;
top: 0;
z-index: 99;
}
.nav .container {
display: flex;
align-items: center;
height: 100%;
justify-content: space-between;
}
.logo {
font-size: 24px;
font-weight: bold;
color: #ff6600;
}
.nav-menu {
display: flex;
gap: 30px;
}
.nav-menu a {
color: var(--sub);
text-decoration: none;
font-size: 15px;
}
.nav-menu a:hover {
color: var(--main);
}

/* Banner */
.banner {
/*background: var(--main);*/
background: #333;
color: white;
padding: 80px 0;
text-align: center;
}
.banner h1 {
font-size: 36px;
margin-bottom: 15px;
}
.banner p {
font-size: 16px;
max-width: 800px;
margin: 0 auto 30px;
opacity: 0.95;
}
.btns {
display: flex;
justify-content: center;
gap: 20px;
}
.btns a {
padding: 12px 30px;
border-radius: 4px;
text-decoration: none;
font-size: 15px;
font-weight: bold;
}
.btn1 {
background: white;
color: var(--main);
}
.btn2 {
background: var(--ok);
color: white;
}

/* 板块通用 */
.section {
padding: 60px 0;
background: white;
margin-bottom: 20px;
border-radius: 8px;
}
.title {
text-align: center;
font-size: 28px;
color: var(--sub);
margin-bottom: 40px;
position: relative;
}
.title::after {
content: "";
width: 60px;
height: 3px;
background: var(--main);
position: absolute;
left: 50%;
bottom: -10px;
transform: translateX(-50%);
}

/* 四大核心优势 */
.advantage {
display: flex;
flex-wrap: wrap;
gap: 20px;
}
.adv-item {
flex: 1;
min-width: 280px;
background: var(--bg);
padding: 30px;
border-radius: 8px;
/* border-left: 4px solid var(--main);*/
border-left: 4px solid #ff6600;
}
.adv-item h3 {
color: #333;
margin-bottom: 10px;
font-size: 18px;
}
.adv-item p {
color: var(--gray);
font-size: 14px;
line-height: 1.7;
}

/* 流程步骤 */
.steps {
display: flex;
justify-content: space-between;
text-align: center;
}
.step {
flex: 1;
}
.step-num {
width: 40px;
height: 40px;
background: #ff6600;
color: white;
border-radius: 50%;
margin: 0 auto 15px;
display: flex;
align-items: center;
justify-content: center;
font-weight: bold;
}
.step-text {
font-size: 14px;
color: var(--sub);
}

/* 招商 */
.banner2 {
background: var(--ok);
color: white;
text-align: center;
padding: 50px 0;
border-radius: 8px;
}
.banner2 h2 {
margin-bottom: 15px;
}
.banner2 p {
max-width: 900px;
margin: 0 auto 25px;
opacity: 0.95;
}

/* 底部 */
.footer {
background: var(--sub);
color: rgba(255,255,255,0.8);
padding: 40px 0;
font-size: 13px;
text-align: center;
}
.footer p {
margin-bottom: 8px;
}
.footer a {
color: rgba(255,255,255,0.8);
margin: 0 5px;
text-decoration: none;
}

/* ========== 响应式布局代码 ========== */
/* 平板设备 (宽度 ≤ 1024px) */
@media screen and (max-width: 1024px) {
    .container {
        width: 90%;
        max-width: 960px;
    }

    .banner h1 {
        font-size: 30px;
    }

    .banner p {
        font-size: 15px;
        padding: 0 20px;
    }

    .title {
        font-size: 26px;
    }

    .advantage {
        gap: 15px;
    }

    .adv-item {
        min-width: calc(50% - 15px);
        flex: 1 1 auto;
    }

    .steps {
        flex-wrap: wrap;
        justify-content: center;
        gap: 30px;
    }

    .step {
        flex: 0 0 calc(33.33% - 20px);
        min-width: 150px;
    }

    .banner2 h2 {
        font-size: 24px;
        padding: 0 20px;
    }

    .banner2 p {
        font-size: 14px;
        padding: 0 20px;
    }
}

/* 手机设备 (宽度 ≤ 768px) */
@media screen and (max-width: 768px) {
    .container {
        width: 92%;
        max-width: 100%;
    }

    /* 导航响应式 */
    .nav-menu {
        gap: 15px;
    }

    .nav-menu a {
        font-size: 13px;
    }

    .logo {
        font-size: 20px;
    }

    /* Banner 响应式 */
    .banner {
        padding: 50px 0;
    }

    .banner h1 {
        font-size: 24px;
        padding: 0 15px;
    }

    .banner p {
        font-size: 14px;
        padding: 0 15px;
        margin-bottom: 25px;
    }

    .btns {
        gap: 15px;
        flex-wrap: wrap;
    }

    .btns a {
        padding: 10px 20px;
        font-size: 14px;
    }

    /* 通用板块响应式 */
    .section {
        padding: 40px 0;
    }

    .title {
        font-size: 22px;
        margin-bottom: 30px;
    }

    .title::after {
        width: 45px;
        height: 2px;
        bottom: -8px;
    }

    /* 四大核心优势响应式 */
    .advantage {
        flex-direction: column;
        gap: 15px;
    }

    .adv-item {
        min-width: 100%;
        padding: 20px;
    }

    .adv-item h3 {
        font-size: 16px;
    }

    .adv-item p {
        font-size: 13px;
    }

    /* 流程步骤响应式 */
    .steps {
        flex-direction: column;
        gap: 25px;
        align-items: center;
    }

    .step {
        flex: 0 0 auto;
        width: 100%;
        max-width: 250px;
    }

    .step-num {
        width: 35px;
        height: 35px;
        font-size: 14px;
    }

    .step-text {
        font-size: 13px;
    }

    /* 招商板块响应式 */
    .banner2 {
        padding: 35px 20px;
    }

    .banner2 h2 {
        font-size: 20px;
        margin-bottom: 12px;
    }

    .banner2 p {
        font-size: 13px;
        margin-bottom: 20px;
    }

    /* 底部响应式 */
    .footer {
        padding: 30px 0;
        font-size: 11px;
    }

    .footer p {
        margin-bottom: 6px;
        word-break: break-all;
    }

    .footer a {
        font-size: 11px;
    }
}

/* 超小屏幕设备 (宽度 ≤ 480px) */
@media screen and (max-width: 480px) {
    .container {
        width: 94%;
    }

    /* 导航精简 */
    .nav {
        height: 60px;
    }

    .nav-menu {
        gap: 10px;
    }

    .nav-menu a {
        font-size: 11px;
    }

    .logo {
        font-size: 18px;
    }

    /* Banner 进一步精简 */
    .banner h1 {
        font-size: 20px;
    }

    .banner p {
        font-size: 12px;
    }

    .btns a {
        padding: 8px 16px;
        font-size: 13px;
    }

    /* 标题精简 */
    .title {
        font-size: 20px;
    }

    .section {
        padding: 30px 0;
    }

    /* 核心优势文字精简 */
    .adv-item {
        padding: 15px;
    }

    .adv-item h3 {
        font-size: 15px;
    }

    .adv-item p {
        font-size: 12px;
    }

    /* 招商板块精简 */
    .banner2 h2 {
        font-size: 18px;
    }

    .banner2 p {
        font-size: 12px;
    }

    /* 底部精简 */
    .footer {
        padding: 25px 0;
    }

    .footer p, .footer a {
        font-size: 10px;
    }
}

/* 横屏模式适配 */
@media screen and (max-height: 600px) and (orientation: landscape) {
    .banner {
        padding: 30px 0;
    }

    .section {
        padding: 30px 0;
    }

    .banner h1 {
        font-size: 24px;
    }

    .steps {
        gap: 15px;
    }

    .step {
        min-width: 120px;
    }
}