/* ===== ヒーロー ===== */
.hero {
    padding: 100px 0 80px;
    text-align: center;
}

.hero-text h1 {
    font-size: 42px;
    font-weight: 600;
    line-height: 1.4;
    margin-bottom: 20px;
}

.hero-text h1 span {
    background: linear-gradient(90deg, #00c6ff, #0072ff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-text p {
    color: #666;
    font-size: 16px;
    margin-bottom: 40px;
}

/* ボタン */
.btn-primary {
    display: inline-block;
    padding: 14px 36px;
    background: linear-gradient(90deg, #00c6ff, #0072ff);
    color: #fff;
    border-radius: 999px;
    text-decoration: none;
    font-weight: 500;
    transition: 0.3s;
}

.btn-primary:hover {
    opacity: 0.85;
    transform: translateY(-2px);
}

/* ===== コンサート一覧 ===== */
.concert-section {
    margin-top: 80px;
    text-align: center; 
}

.concert-section h2 {
    font-size: 26px;
    margin-bottom: 30px;
}

.concert-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 24px;
}

.concert-card {
    text-decoration: none;
    color: inherit;
}

.concert-info {
    background: #fff;
    border-radius: 16px;
    padding: 24px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.05);
    transition: 0.3s;
}

.concert-info:hover {
    transform: translateY(-6px);
    box-shadow: 0 16px 40px rgba(0,0,0,0.1);
}

.concert-info h3 {
    font-size: 18px;
    margin-bottom: 10px;
}

.concert-date {
    font-size: 14px;
    color: #0072ff;
    margin-bottom: 10px;
}

.concert-desc {
    font-size: 14px;
    color: #666;
}

/* ===== About ===== */
.about {
    margin: 120px 0;
    text-align: center;
}

.about h2 {
    font-size: 28px;
    margin-bottom: 50px;
}

.about-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 30px;
}

.about-card {
    background: #fff;
    padding: 30px;
    border-radius: 18px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.05);
}

.about-card h3 {
    margin-bottom: 15px;
}

.about-card p {
    color: #666;
    font-size: 15px;
}

/* ===== スマホ ===== */
@media (max-width: 768px) {
    .hero-text h1 {
        font-size: 32px;
    }

    .hero {
        padding: 70px 0;
    }
}