/* 全局样式重置 & 基础设置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Microsoft Yahei", "PingFang SC", sans-serif;
}
:root {
    --main-cyan: #D0E8E4;
    --main-orange: #FFA87A;
    --text-dark: #333333;
    --text-gray: #666666;
    --white: #ffffff;
    --shadow: 0 4px 12px rgba(0,0,0,0.08);
}
body {
    color: var(--text-dark);
    background-color: #fafafa;
    line-height: 1.7;
}
a {
    text-decoration: none;
    color: inherit;
}
ul {
    list-style: none;
}
.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
}
.btn {
    display: inline-block;
    padding: 10px 28px;
    border-radius: 30px;
    border: none;
    cursor: pointer;
    font-size: 15px;
    transition: all 0.3s ease;
}
.btn-primary {
    background-color: var(--main-orange);
    color: var(--white);
}
.btn-primary:hover {
    opacity: 0.9;
    transform: translateY(-2px);
}
.btn-outline {
    background: transparent;
    border: 1px solid var(--white);
    color: var(--white);
}
.btn-outline:hover {
    background: var(--white);
    color: var(--text-dark);
}
.section {
    padding: 70px 0;
}
.section-title {
    font-size: 28px;
    text-align: center;
    margin-bottom: 12px;
    font-weight: 600;
}
.section-desc {
    text-align: center;
    color: var(--text-gray);
    margin-bottom: 50px;
    font-size: 16px;
}

/* 顶部导航 */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(255,255,255,0.92);
    box-shadow: var(--shadow);
    z-index: 999;
}
.nav-wrap {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}
.logo {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-dark);
}
.logo span {
    font-size: 14px;
    color: var(--text-gray);
    margin-left: 8px;
    font-weight: 400;
}
.nav-list {
    display: flex;
    gap: 35px;
}
.nav-list li a {
    font-size: 15px;
    color: var(--text-dark);
    position: relative;
}
.nav-list li a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--main-orange);
    transition: width 0.3s;
}
.nav-list li a:hover::after {
    width: 100%;
}

/* 首屏Banner */
.banner {
    margin-top: 70px;
    height: calc(100vh - 70px);
    background: linear-gradient(rgba(0,0,0,0.35), rgba(0,0,0,0.35)), var(--banner-bg) center/cover no-repeat;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    color: var(--white);
    text-align: center;
    padding: 0 20px;
}
.banner h1 {
    font-size: 56px;
    margin-bottom: 15px;
    font-weight: 600;
}
.banner h2 {
    font-size: 22px;
    font-weight: 400;
    margin-bottom: 20px;
    opacity: 0.95;
}
.banner p {
    font-size: 17px;
    margin-bottom: 40px;
    max-width: 600px;
}
.banner-btns {
    display: flex;
    gap: 20px;
}

/* 项目介绍板块 */
.intro {
    background-color: var(--white);
}
.intro-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: center;
}
.intro-text h3 {
    font-size: 24px;
    margin-bottom: 20px;
}
.intro-text p {
    color: var(--text-gray);
    font-size: 16px;
    margin-bottom: 15px;
}
.intro-img {
    width: 100%;
    height: 380px;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow);
}
.intro-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* 核心亮点 四宫格 */
.feature {
    background-color: var(--main-cyan);
}
.feature-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 25px;
}
.feature-card {
    background: var(--white);
    padding: 25px;
    border-radius: 12px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: transform 0.3s ease;
}
.feature-card:hover {
    transform: translateY(-8px);
}
.feature-card .card-img {
    width: 100%;
    height: 160px;
    border-radius: 8px;
    overflow: hidden;
    margin-bottom: 15px;
}
.feature-card .card-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.feature-card h4 {
    font-size: 18px;
    margin: 0 0 12px;
}
.feature-card p {
    color: var(--text-gray);
    font-size: 15px;
}

/* 内容体系板块 */
.content {
    background: var(--white);
}
.content-wrap {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}
.content-item {
    padding: 30px;
    border: 1px solid #eee;
    border-radius: 12px;
}
.content-item h4 {
    font-size: 20px;
    margin-bottom: 15px;
    color: var(--main-orange);
}
.content-item p {
    color: var(--text-gray);
}
.time-tip {
    text-align: center;
    margin-top: 40px;
    font-size: 16px;
    color: var(--text-dark);
    padding: 15px;
    background: #f8f8f8;
    border-radius: 8px;
}

/* 团队&资源 */
.team {
    background-color: #f5f9f8;
}
.team-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
}
.team-box {
    padding: 30px;
    background: var(--white);
    border-radius: 12px;
    box-shadow: var(--shadow);
}
.team-box h4 {
    font-size: 22px;
    margin-bottom: 20px;
}
.team-box p, .team-box li {
    color: var(--text-gray);
    margin-bottom: 10px;
}
.team-box ul {
    margin-top: 15px;
}

/* 招募板块 */
.recruit {
    background: linear-gradient(135deg, #ffe8d9, var(--main-cyan));
}
.recruit-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 25px;
}
.recruit-card {
    background: var(--white);
    padding: 30px;
    border-radius: 12px;
    text-align: center;
}
.recruit-card h4 {
    font-size: 19px;
    margin-bottom: 15px;
}
.recruit-card p {
    color: var(--text-gray);
    margin-bottom: 25px;
}

/* 愿景板块 */
.vision {
    background: var(--white);
    text-align: center;
}
.vision p {
    max-width: 800px;
    margin: 0 auto 20px;
    color: var(--text-gray);
    font-size: 17px;
}

/* 页脚 */
footer {
    background: #222;
    color: #aaa;
    padding: 50px 0 30px;
}
.footer-row {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 30px;
    margin-bottom: 30px;
}
.footer-col h4 {
    color: var(--white);
    font-size: 18px;
    margin-bottom: 15px;
}
.social-links {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
}
.social-link {
    color: #aaa;
    font-size: 14px;
    transition: color 0.3s;
}
.social-link:hover {
    color: var(--main-orange);
}
.social-divider {
    color: #444;
}
.copyright {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid #333;
    font-size: 14px;
}

/* 弹窗样式 */
.modal-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    z-index: 1000;
    justify-content: center;
    align-items: center;
}
.modal-overlay.active {
    display: flex;
}
.modal-content {
    background: var(--white);
    padding: 30px;
    border-radius: 16px;
    text-align: center;
    max-width: 360px;
    width: 90%;
    position: relative;
    box-shadow: 0 10px 40px rgba(0,0,0,0.2);
}
.modal-close {
    position: absolute;
    top: 15px;
    right: 15px;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    border: none;
    background: #eee;
    font-size: 20px;
    cursor: pointer;
    color: #666;
    transition: all 0.3s;
}
.modal-close:hover {
    background: #ddd;
    color: #333;
}
.modal-qrcode {
    width: 200px;
    height: 200px;
    margin: 20px auto;
    border-radius: 8px;
    overflow: hidden;
    background: #f8f8f8;
}
.modal-qrcode img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.modal-title {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-dark);
}
.modal-desc {
    color: var(--text-gray);
    font-size: 14px;
    margin-top: 10px;
}

/* 响应式 手机适配 */
@media (max-width: 768px) {
    .nav-list {
        display: none;
    }
    .banner h1 {
        font-size: 36px;
    }
    .banner h2 {
        font-size: 18px;
    }
    .intro-row, .team-row {
        grid-template-columns: 1fr;
    }
    .feature-grid, .content-wrap, .recruit-grid {
        grid-template-columns: 1fr;
    }
    .section {
        padding: 40px 0;
    }
}