* {

    box-sizing: border-box;

}

body {
    margin: 0;
    background: #f7f4ed;
    font-family: 'Poppins', sans-serif;
    color: #222;
}

/* ===== HEADER ===== */

.concert-header {
    background: white;
    border-bottom: 1px solid #e8e2d3;
    padding: 20px 0;
}

.header-inner {
    width: 90%;
    max-width: 1200px;
    margin: auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.header-logo img {
    height: 45px;
}

.header-title {
    flex: 1;
    text-align: center;
}

.concert-name {
    font-family: 'Cormorant Garamond', serif;
    font-size: 30px;
    font-weight: 600;
    letter-spacing: 1px;
    text-decoration: none;
    color: #1a1a1a;
}

.concert-name:hover {
    color: #b4973f;
}

.header-menu {
    display: flex;
    gap: 18px;
}

.header-menu a {
    text-decoration: none;
    font-size: 14px;
    color: #444;
    position: relative;
}

.header-menu a:hover {
    color: #b4973f;
}

/* ===== MAIN ===== */

.concert-main {
    padding: 60px 0;
}

.content-wrapper {
    width: 85%;
    max-width: 1000px;
    margin: auto;
    background: white;
    padding: 60px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.05);
}

/* ===== FOOTER ===== */

.concert-footer {
    margin-top: 80px;
    padding: 30px 0;
    background: #fff;
    border-top: 1px solid #e8e2d3;
    text-align: center;
}

.footer-inner img {
    height: 40px;
    margin-bottom: 10px;
}

.footer-inner p {
    font-size: 13px;
    color: #777;
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
}

.hamburger span {
    width: 24px;
    height: 2px;
    background: #333;
    transition: 0.3s;
}

@media (max-width: 768px) {

    .header-menu {
        position: fixed;
        top: 0;
        right: -250px;
        width: 220px;
        height: 100%;
        background: white;
        flex-direction: column;
        padding: 80px 20px;
        gap: 20px;
        box-shadow: -5px 0 20px rgba(0,0,0,0.08);
        transition: right 0.3s ease;
    }

    .header-menu.active {
        right: 0;
    }

    .hamburger {
        display: flex;
    }

    .header-title {
        text-align: left;
        font-size: 20px;
    }
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translateY(7px);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translateY(-7px);
}



/* ===== MAIN エリアのスマホ調整 ===== */

@media (max-width: 768px) {
    /* 1. コンテンツの余白を削る（重要！） */
    .content-wrapper {
        width: 95%;      /* 85%だと細すぎるので広げる */
        padding: 20px;   /* 60pxはスマホでは広すぎるので20pxに */
    }

    /* 2. メインエリア自体の上下余白も調整 */
    .concert-main {
        padding: 30px 0;
    }

    /* 3. ロゴのサイズを少し小さく */
    .header-logo img {
        height: 35px;
    }

    /* 4. コンサート名の文字サイズ調整 */
    .concert-name {
        font-size: 22px; /* 30pxだとスマホでは1行に収まらないため */
    }
}