:root {
    --primary-color: #6a82fb; /* 青 */
    --secondary-color: #fc5c7d; /* ピンク */
    --dark-bg: #222831;
    --light-text: #eee;
    --card-bg: rgba(255, 255, 255, 0.9);
    --frosted-glass-bg: rgba(255, 255, 255, 0.15); /* より透明なフロストグラス */
    --frosted-glass-border: rgba(255, 255, 255, 0.25);
    --shadow-light: rgba(0, 0, 0, 0.1);
    --shadow-medium: rgba(0, 0, 0, 0.25); /* 影を少し濃く */
    --shadow-strong: rgba(0, 0, 0, 0.4);
    --text-gradient: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
}
body{
    font-family: sans-serif;
    padding: 2em;
    margin: 0;
    padding-top: 60px;
    min-height: 100vh;
    background: url("./6.png") center/cover no-repeat;
    background-color: rgba(255, 255, 255, 0.5);
    background-blend-mode: overlay;
    font-family: "Segoe UI", sans-serif;
}
#content{
    border: 1px solid #ccc;
    padding: 1em;
    background: #f9f9f9;
    border-radius: 10px;
}
main{
    max-width: 800px;
    margin: 80px auto 40px;
    padding: 20px;
    background-color: rgba(255, 255, 255, 0.85);
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.3);
    text-align: center;
}
h1{
    margin-bottom: 10px;
}
p{
    font-size: 18px;
    color: #333;
}
.hero-section {
    text-align: center;
    margin-bottom: 60px;
    margin-top: 40px;
    padding: 20px;
}
.hero-section h1 {
    font-size: 4em; /* より大きく */
    font-weight: 700;
    color: transparent;
    background: var(--text-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    text-shadow: 0 8px 20px var(--shadow-medium);
    letter-spacing: 3px;
    margin-bottom: 10px;
}
.button {
    display: inline-block;
    padding: 15px 30px;
    border-radius: 10px;
    font-weight: bold;
    text-decoration: none;
    transition: all 0.3s ease;
    box-shadow: 0 4px 10px var(--shadow-light);
    font-size: 1.1em;
}

.button.primary {
    background: var(--text-gradient);
    color: white;
}

.button.primary:hover {
    background: linear-gradient(45deg, var(--secondary-color), var(--primary-color));
    transform: translateY(-2px);
    box-shadow: 0 6px 15px var(--shadow-medium);
}

.button.secondary {
    background-color: transparent;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
}

.button.secondary:hover {
    background-color: var(--primary-color);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 6px 15px var(--shadow-medium);
}
@media(max-width: 900px){
    .hero-section h1 {
        font-size: 3.5em;
    }
}
@media(max-width: 768px){
    .hero-section {
        margin-top: 20px;
    }
    .hero-section h1 {
        font-size: 2.8em;
        letter-spacing: 2px;
    }
    main{
        margin: 70px 10px 30px;
        padding: 15px;
    }
    p{
        font-size: 16px;
    }
}
@media(max-width: 480px){
    .hero-section h1 {
        font-size: 2.2em;
    }
    main{
        margin: 60px 5px 20px;
        padding: 12px;
    }
    p{
        font-size: 14px;
    }
}