body {
    margin: 0;
    font-family: system-ui, -apple-system, BlinkMacSystemFont;
}

.site-header {
    border-bottom: 1px solid #e5e7eb;
    background: #fff;
}

.hamburger {
    display: none;
    font-size: 24px;
    background: none;
    border: none;
    cursor: pointer;
}

.hamburger .icon-close {
    display: none;
}

.hamburger.active .icon-menu {
    display: none;
}

.hamburger.active .icon-close {
    display: inline;
}

@media (max-width: 768px) {
    .hamburger {
        display: block;
        color: #111;
        font-size: 26px;
    }

    .nav {
        display: none;
        position: absolute;
        top: 60px;
        left: 0;
        width: 100%;
        background: #fff;
        border-top: 1px solid #e5e7eb;
        flex-direction: column;
        padding: 12px 0;
        z-index: 100;
    }

    .nav a {
        padding: 12px 16px;
        border-bottom: 1px solid #f1f5f9;
    }

    .nav.open {
        display: flex;              /* 開いたら表示 */
    }

    .header-inner {
        position: relative;
    }
}

.header-inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: 12px 16px;

    display: flex;                 /* ← 必須 */
    align-items: center;
    justify-content: space-between;
}

/* ロゴ */
.logo {
    font-size: 22px;
    font-weight: 700;
    white-space: nowrap;           /* ← 改行させない */
}

.logo a {
    text-decoration: none;
    color: #111;
    display: inline-block;         /* ← blockにしない */
}

.container {
    max-width: 720px;
    margin: 0 auto;
    padding: 4px 16px;
}

.site-footer {
    border-top: 1px solid #e5e7eb;
    padding: 16px;
    text-align: center;
    font-size: 13px;
    color: #6b7280;
}

.footer-nav a {
    margin: 0 8px;
    text-decoration: none;
    color: #6b7280;
}

.hamburger {
    transition: transform 0.15s ease;
}

.hamburger.active {
    transform: rotate(90deg);
}

.button {
    display: inline-block;
    padding: 14px 28px;
    background: #4f46e5;
    color: #fff;
    text-decoration: none;
    border-radius: 8px;
    font-size: 16px;
}

.button:hover {
    opacity: 0.9;
}

.tagline {
    font-size: 18px;
    color: #666;
    margin-bottom: 40px;
}

.description {
    font-size: 14px;
    line-height: 1.8;
    margin-bottom: 10px;
}

h1 {
    margin-bottom: 24px;
}

h2 {
    margin-top: 32px;
    font-size: 18px;
}

p, li {
    line-height: 1.8;
}

.note {
    font-size: 13px;
    color: #6b7280;
}

.text-center {
    text-align: center;
}

.contact-form {
    max-width: 600px;
    margin-top: 24px;
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    margin-bottom: 6px;
    font-weight: 600;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid #d1d5db;
    border-radius: 4px;
    font-size: 14px;
}

.form-group textarea {
    resize: vertical;
}

.note {
    margin-top: 24px;
    font-size: 13px;
    color: #6b7280;
}