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

/* 根变量 */
:root {
    --primary-color: #4a90e2;
    --secondary-color: #2c3e50;
    --text-color: #333;
    --light-bg: #f8f9fa;
    --white: #ffffff;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 导航栏 */
.navbar {
    background: var(--white);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 20px;
}

.nav-brand h1 {
    color: var(--primary-color);
    font-size: 1.5rem;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-menu li a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: var(--transition);
}

.nav-menu li a:hover {
    color: var(--primary-color);
}

/* 移动端菜单按钮 */
.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 5px;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--secondary-color);
    transition: var(--transition);
}

/* 主页横幅 */
.hero-banner {
    position: relative;
    width: 100%;
}

.hero-banner img{
    width:100%; 
    height: auto;
    display: block;
    position: relative;
    z-index: 1;
}

.banner-btn {
    position: absolute;
    top: 75%;
    left: 13%;
    z-index: 10;
    border: none;
}


.nr{padding:80px 20%; display: flex; flex-wrap: wrap; justify-content: space-around;}
.nr .nr-txt{width:48%; display: flex; align-items: center;}
.nr .nr-txt h3{font-size: 2.8rem; margin-bottom: 0.5rem; font-weight: normal; color: #484848;}
.nr .nr-txt p{font-size: 2rem; line-height: 1.5; margin-bottom: 1rem; color: #6e6e6e;}
.nr .nr-img{width:48%;}
.nr .nr-img img{width: 100%; height: auto; display: block;}

/* 关于我们页面 */
.about-section {
    padding: 100px 20px;
    background: linear-gradient(to bottom, #f8f9fa 0%, #ffffff 100%);
}

.about-content {
    max-width: 1200px;
    margin: 0 auto;
}

.section-title {
    text-align: center;
    font-size: 3rem;
    margin-bottom: 4rem;
    color: var(--secondary-color);
    font-weight: 600;
}

.company-name {
    font-size: 3.5rem;
    color: var(--primary-color);
    margin-bottom: 3rem;
    text-align: center;
    font-weight: 700;
    letter-spacing: 2px;
    position: relative;
    padding-bottom: 1.5rem;
}

.company-name::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 4px;
    background: linear-gradient(to right, var(--primary-color), #667eea);
    border-radius: 2px;
}

.company-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2.5rem;
    margin-bottom: 4rem;
}

.info-item {
    background: var(--white);
    padding: 3rem 2rem;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    text-align: center;
    transition: all 0.4s ease;
    position: relative;
    overflow: hidden;
}

.info-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 5px;
    background: linear-gradient(to right, var(--primary-color), #667eea);
    transform: scaleX(0);
    transition: transform 0.4s ease;
}

.info-item:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
}

.info-item:hover::before {
    transform: scaleX(1);
}

.info-item h4 {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    font-weight: bold;
}

.info-item p {
    font-size: 1.15rem;
    color: var(--text-color);
    line-height: 1.8;
}

.company-description {
    background: linear-gradient(135deg, #667eea 0%, var(--primary-color) 100%);
    padding: 4rem 3rem;
    border-radius: 20px;
    margin-top: 4rem;
    color: white;
    position: relative;
    overflow: hidden;
}

.company-description::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
    animation: shimmer 3s infinite;
}

@keyframes shimmer {
    0%, 100% { transform: translate(0, 0); }
    50% { transform: translate(20px, 20px); }
}

.company-description p {
    font-size: 1.3rem;
    line-height: 2.2;
    color: white;
    text-align: center;
    position: relative;
    z-index: 1;
    font-weight: 300;
}

footer{background:#0983D4; text-align: center; padding: 20px 0; color: #FFF; line-height: 1.8; font-size: 14px;}
footer a{ color:#ddd; text-decoration: none;}


.about-section{padding: 80px 20%;}
.about-section .section-title{text-align: left; font-size: 3rem; margin-bottom: 4rem; color: var(--secondary-color); font-weight: 600;}
.about-section .company-name{font-size: 3.5rem; color: var(--primary-color); margin-bottom: 3rem; text-align: left; font-weight: 700; letter-spacing: 2px; position: relative; padding-bottom: 1.5rem;}
.about-section .company-name::after{content: ''; position: absolute; bottom: 0; left: 50%; transform: translateX(-50%); width: 100px; height: 4px; background: linear-gradient(to right, var(--primary-color), #667eea); border-radius: 2px;}
.about-section .company-info{display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 2.5rem; margin-bottom: 4rem;}
.about-section .info-item{background: var(--white); padding: 3rem 2rem; border-radius: 15px; box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1); text-align: center; transition: all 0.4s ease; position: relative; overflow: hidden;}
.about-section .info-item::before{content: ''; position: absolute; top: 0; left: 0; right: 0; height: 5px; background: linear-gradient(to right, var(--primary-color), #667eea); transform: scaleX(0); transition: transform 0.4s ease;}
.about-section .info-item:hover{transform: translateY(-10px); box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);}
.about-section .info-item:hover::before{transform: scaleX(1);}
.about-section .info-item h4{font-size: 1.5rem; color: var(--primary-color); margin-bottom: 1.5rem; font-weight: bold;}
.about-section .info-item p{font-size: 1.15rem; color: var(--text-color); line-height: 1.8;}
.about-section .company-description{background: linear-gradient(135deg, #667eea 0%, var(--primary-color) 100%); padding: 4rem 3rem; border-radius: 20px; margin-top: 4rem; color: white; position: relative; overflow: hidden;}
.about-section .company-description::before{content: ''; position: absolute; top: -50%; right: -50%; width: 200%; height: 200%; background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%); animation: shimmer 3s infinite;}
.about-section .company-description p{font-size: 1.3rem; line-height: 2.2; color: white; text-align: center; position: relative; z-index: 1; font-weight: 300;}

/* 联系我们页面 */
.contact-section{padding: 80px 20px; background: linear-gradient(to bottom, #f8f9fa 0%, #ffffff 100%);}
.contact-section .section-title{text-align: center; font-size: 3rem; margin-bottom: 4rem; color: var(--secondary-color); font-weight: 600;}
.contact-content{max-width: 1200px; margin: 0 auto;}
.contact-info{display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 2rem; margin-bottom: 3rem;}
.contact-item{background: var(--white); padding: 3rem 2rem; border-radius: 15px; box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1); text-align: center; transition: all 0.4s ease; position: relative; overflow: hidden;}
.contact-item::before{content: ''; position: absolute; top: 0; left: 0; right: 0; height: 5px; background: linear-gradient(to right, var(--primary-color), #667eea); transform: scaleX(0); transition: transform 0.4s ease;}
.contact-item:hover{transform: translateY(-10px); box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);}
.contact-item:hover::before{transform: scaleX(1);}
.contact-icon{font-size: 4rem; margin-bottom: 1.5rem;}
.contact-item h3{font-size: 1.5rem; color: var(--primary-color); margin-bottom: 1rem; font-weight: bold;}
.contact-item p{font-size: 1.15rem; color: var(--text-color); line-height: 1.8;}
.contact-item a{color: var(--primary-color); text-decoration: none; transition: color 0.3s;}
.contact-item a:hover{color: #667eea; text-decoration: underline;}
.contact-license{background: linear-gradient(135deg, #667eea 0%, var(--primary-color) 100%); padding: 3rem; border-radius: 15px; text-align: center; color: white; font-size: 1.2rem; font-weight: 300;}

/* 按钮 */
.btn-primary {
    background: var(--white);
    color: var(--primary-color);
    padding: 12px 30px;
    border: none;
    border-radius: 5px;
    font-size: 1rem;
    font-weight: bold;
    cursor: pointer;
    transition: var(--transition);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

/* 宣传图片 */
.promo-section {
    padding: 40px 20px;
}

.promo-img {
    width: 100%;
    height: auto;
    display: block;
}

/* 通用部分 */
.section {
    padding: 80px 20px;
}

.section-alt {
    background: var(--light-bg);
}

/* 网格布局 */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.grid-2 {
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
}



/* 响应式设计 - 平板 */
@media screen and (max-width: 768px) {
    .hamburger {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background: var(--white);
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: var(--shadow);
        padding: 2rem 0;
        gap: 1rem;
    }

    .nav-menu.active {
        left: 0;
    }

    .section-title {
        font-size: 2rem;
    }

    .grid {
        grid-template-columns: 1fr;
    }

    .grid-2 {
        grid-template-columns: 1fr;
    }

    .about-section {
        padding: 70px 20px;
    }

    .section-title {
        font-size: 2.5rem;
    }

    .company-name {
        font-size: 3rem;
        margin-bottom: 2.5rem;
    }

    .company-info {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    }

    .contact-section {
        padding: 70px 20px;
    }

    .contact-info {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    }
}

/* 响应式设计 - 手机 */
@media screen and (max-width: 480px) {
    .section {
        padding: 40px 20px;
    }

    .section-title {
        font-size: 1.5rem;
    }

    .card {
        padding: 1.5rem;
    }

    .about-section {
        padding: 50px 20px;
    }

    .section-title {
        font-size: 1.8rem;
        margin-bottom: 2rem;
    }

    .company-name {
        font-size: 2rem;
        margin-bottom: 2rem;
        letter-spacing: 0.5px;
    }

    .company-info {
        grid-template-columns: 1fr;
        gap: 1.5rem;
        margin-bottom: 2.5rem;
    }

    .info-item {
        padding: 2rem 1.5rem;
    }

    .info-item h4 {
        font-size: 1.3rem;
    }

    .info-item p {
        font-size: 1rem;
    }

    .company-description {
        padding: 2.5rem 1.5rem;
        margin-top: 2.5rem;
        border-radius: 15px;
    }

    .company-description p {
        font-size: 1rem;
        line-height: 1.6;
    }

    .contact-section {
        padding: 50px 20px;
    }

    .contact-info {
        grid-template-columns: 1fr;
        gap: 1.5rem;
        margin-bottom: 2rem;
    }

    .contact-item {
        padding: 2rem 1.5rem;
    }

    .contact-icon {
        font-size: 3rem;
        margin-bottom: 1rem;
    }

    .contact-item h3 {
        font-size: 1.3rem;
    }

    .contact-item p {
        font-size: 1rem;
    }

    .contact-license {
        padding: 2rem 1.5rem;
        font-size: 1rem;
    }
}