body {  
    font-family: "ヒラギノ角ゴ ProN", "メイリオ", "Arial", sans-serif;  
    background: #f4f7fa;  
    color: #333;  
    margin: 0;  
    padding: 0;  
}  
  
/* 固定导航栏 */  
header {  
    position: fixed;  
    top: 0;  
    left: 0;  
    width: 100%;  
    z-index: 99;  
    background: #2574a9;  
    color: #fff;  
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);  
}  
  
.navbar {  
    max-width: 1100px;  
    margin: 0 auto;  
    display: flex;  
    align-items: center;  
    padding: 0 24px;  
    justify-content: space-between;  
    height: 70px;  
}  
  
.logo-title {  
    display: flex;  
    align-items: center;  
    gap: 15px;  
}  
  
.logo {  
    width: 44px;  
    height: 44px;  
    border-radius: 50%;  
    object-fit: cover;  
    border: 2px solid #fff;  
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);  
}  
  
.site-title {  
    font-size: 1.35em;  
    font-weight: bold;  
    letter-spacing: 2px;  
}  
  
nav {  
    display: flex;  
    align-items: center;  
    gap: 18px;  
}  
  
nav a {  
    color: #fff;  
    text-decoration: none;  
    font-weight: 500;  
    font-size: 1em;  
    transition: color 0.2s;  
    padding: 4px 10px;  
    border-radius: 4px;  
}  
  
nav a:hover {  
    background: #fff;  
    color: #2574a9;  
}  
  
/* Hero Banner */  
.hero {  
    position: relative;  
    width: 100%;  
    height: 350px;  
    background: linear-gradient(to right, #2574a9b8 60%, #fff 100%);  
    overflow: hidden;  
    margin-top: 70px;  
}  
  
.hero-bg {  
    position: absolute;  
    top: 0; left: 0; width: 100%; height: 100%;  
    background-image: url("https://images.unsplash.com/photo-1506744038136-46273834b3fb?auto=format&fit=crop&w=1200&q=80");  
    background-size: cover;  
    background-position: center;  
    opacity: 0.35;  
}  
  
.hero-content {  
    position: relative;  
    z-index: 2;  
    padding: 60px 24px 0 24px;  
    max-width: 700px;  
    margin: 0 auto;  
    text-align: center;  
    color: #2574a9;  
}  
  
.hero-content h1 {  
    font-size: 2.4em;  
    margin-bottom: 12px;  
    letter-spacing: 2px;  
    text-shadow: 0 2px 8px #fff8;  
}  
  
.hero-content p {  
    font-size: 1.2em;  
    margin-bottom: 18px;  
    text-shadow: 0 2px 8px #fff8;  
}  
  
.hero-btn {  
    background: #2574a9;  
    color: #fff;  
    padding: 12px 32px;  
    border-radius: 30px;  
    font-size: 1.1em;  
    text-decoration: none;  
    box-shadow: 0 2px 8px #2574a955;  
    font-weight: bold;  
    transition: background 0.2s;  
    border: none;  
}  
.hero-btn:hover {  
    background: #125282;  
}  
  
/* 卡片布局 */  
main {  
    max-width: 1100px;  
    margin: 0 auto;  
    padding: 36px 12px 24px 12px;  
}  
  
.card {  
    background: #fff;  
    border-radius: 14px;  
    box-shadow: 0 4px 18px rgba(0,0,0,0.08);  
    margin-bottom: 32px;  
    padding: 32px 24px;  
}  
  
/* section */  
h2 {  
    color: #2574a9;  
    border-left: 6px solid #2574a9;  
    background: linear-gradient(to right, #e3eaf3 50%, transparent 100%);  
    padding-left: 12px;  
    margin-bottom: 18px;  
    font-size: 1.55em;  
    letter-spacing: 1px;  
}  
  
h3 {  
    color: #557fa9;  
    margin-top: 12px;  
    margin-bottom: 8px;  
    font-size: 1.15em;  
}  
  
ul {  
    margin: 8px 0 0 24px;  
    padding: 0;  
}  
  
li {  
    margin-bottom: 6px;  
    line-height: 1.7;  
}  
  
a {  
    color: #2574a9;  
    text-decoration: underline;  
}  
  
.section-flex {  
    display: flex;  
    align-items: flex-start;  
    gap: 32px;  
    flex-wrap: wrap;  
}  
  
.section-flex.reverse {  
    flex-direction: row-reverse;  
}  
  
.section-text {  
    flex: 1 1 360px;  
    min-width: 240px;  
}  
  
.section-img, .large-img {  
    width: 400px;  
    height: 270px;  
    border-radius: 12px;  
    object-fit: cover;  
    box-shadow: 0 2px 8px rgba(0,0,0,0.09);  
    margin-top: 12px;  
}  
  
.team-img-list {  
    display: flex;  
    gap: 16px;  
    align-items: center;  
    margin-top: 8px;  
}  
  
.team-img {  
    width: 80px;  
    height: 80px;  
    border-radius: 50%;  
    object-fit: cover;  
    border: 2px solid #2574a9;  
    box-shadow: 0 2px 10px rgba(0,0,0,0.08);  
}  
  
/* 活動内容 */  
.activity-grid {  
    display: grid;  
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));  
    gap: 24px;  
    margin-top: 16px;  
}  
  
.activity-item {  
    background: #f4f7fa;  
    border-radius: 10px;  
    padding: 18px 10px 12px 10px;  
    text-align: center;  
    box-shadow: 0 2px 8px rgba(0,0,0,0.04);  
    transition: box-shadow 0.2s;  
}  
.activity-item:hover {  
    box-shadow: 0 6px 18px #2574a922;  
}  
  
.activity-item img {  
    width: 100%;  
    height: 150px;  
    object-fit: cover;  
    border-radius: 8px;  
    margin-bottom: 8px;  
}  
  
/* 活動レポート新闻卡片 */  
.news-grid {  
    display: grid;  
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));  
    gap: 24px;  
}  
  
.news-card {  
    background: #f4f7fa;  
    border-radius: 10px;  
    padding: 14px 14px 18px 14px;  
    box-shadow: 0 2px 8px rgba(0,0,0,0.04);  
    transition: box-shadow 0.2s;  
    display: flex;  
    flex-direction: column;  
    align-items: center;  
}  
.news-card:hover {  
    box-shadow: 0 6px 18px #2574a922;  
}  
.news-card img {  
    width: 100%;  
    max-width: 320px;  
    height: 110px;  
    object-fit: cover;  
    border-radius: 8px;  
    margin-bottom: 10px;  
}  
  
/* 响应式 */  
@media (max-width: 1000px) {  
    main { padding: 18px 4px; }  
    .navbar { padding: 0 6px; }  
    .hero-content { padding: 45px 2vw 0 2vw; }  
    .card { padding: 18px 8px; }  
}  
  
@media (max-width: 800px) {  
    .section-flex, .section-flex.reverse {  
        flex-direction: column;  
        gap: 16px;  
    }  
    .section-img, .large-img {  
        width: 100%;  
        height: 150px;  
    }  
    .team-img-list {  
        gap: 10px;  
    }  
    .team-img {  
        width: 60px;  
        height: 60px;  
    }  
    .activity-item img {  
        height: 90px;  
    }  
}  
  
@media (max-width: 600px) {  
    nav { gap: 6px; }  
    .site-title { font-size: 1em; }  
    .news-card img { height: 70px; }  
    .hero { height: 220px; }  
    .hero-content h1 { font-size: 1.2em; }  
    .hero-content p { font-size: 1em; }  
    .hero-btn { padding: 8px 18px; font-size: 1em; }  
}  
  
/* 页脚 */  
footer {  
    background: #e3eaf3;  
    color: #666;  
    text-align: center;  
    padding: 24px 0 10px 0;  
    font-size: 0.98em;  
    letter-spacing: 1px;  
    border-top: 1px solid #c3d4e3;  
}  
.footer-content {  
    max-width: 1100px;  
    margin: 0 auto;  
}