body {
    margin: 0;
    font-family: "Hiragino Sans", "Noto Sans JP", sans-serif;
    background: #e8f7ef;
    color: #003322;
}

header {
    background: #1b5e20;
    color: white;
    padding: 25px 0;
    text-align: center;
}

.logo {
    width: 120px;
    margin-bottom: 10px;
}

.subtitle {
    font-size: 14px;
    opacity: 0.8;
}

nav {
    background: #004d25;
    padding: 10px 0;
}

nav ul {
    display: flex;
    justify-content: center;
    list-style: none;
    margin: 0;
    padding: 0;
}

nav a {
    color: white;
    margin: 0 20px;
    text-decoration: none;
    font-weight: bold;
}

nav a:hover {
    opacity: 0.7;
}

#hero {
    background: url('https://images.unsplash.com/photo-1473445195779-22a1d8d5bdb1?auto=format&fit=crop&w=1350&q=60');
    background-size: cover;
    background-position: center;
    padding: 150px 20px;
    text-align: center;
    color: white;
}

.content {
    padding: 60px 20px;
    max-width: 900px;
    margin: auto;
}

h2 {
    color: #004d25;
    border-left: 8px solid #1b5e20;
    padding-left: 10px;
}

.cards {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
}

.card {
    background: white;
    padding: 20px;
    border-radius: 10px;
    flex: 1;
    min-width: 260px;
    box-shadow: 0 3px 8px rgba(0,0,0,0.1);
}

.project-list li {
    margin: 10px 0;
}

.eco-box {
    background: white;
    padding: 20px;
    border-left: 6px solid #1b5e20;
    margin-bottom: 20px;
    border-radius: 6px;
}

/* SNSボタン */
.sns-icons {
    display: flex;
    gap: 20px;
    margin-top: 25px;
}

.sns {
    padding: 12px 20px;
    border-radius: 6px;
    color: white;
    font-weight: bold;
    text-decoration: none;
    display: inline-block;
}

.sns.twitter { background: #1DA1F2; }
.sns.instagram { background: #E4405F; }
.sns.youtube { background: #FF0000; }

.sns:hover {
    opacity: 0.8;
}

footer {
    background: #003822;
    color: white;
    text-align: center;
    padding: 20px;
    margin-top: 40px;
}