/* ========== 共通設定 ========== */
body {
    margin: 0;
    font-family: 'Noto Serif JP', 'Yu Mincho', serif; /* Prioritize Noto Serif JP for a modern, elegant look */
    background-color: #FAF9F7;
    color: #333;
    line-height: 1.8;
    overflow-x: hidden; /* Prevent horizontal scroll */
    -webkit-font-smoothing: antialiased; /* Smoother font rendering */
    -moz-osx-font-smoothing: grayscale; /* Smoother font rendering */
}

h1, h2, h3, h4 {
    font-weight: 500; /* Medium weight for headings */
    color: #5A4E3C;
    margin-bottom: 0.5em;
    font-family: 'Noto Serif JP', 'Yu Mincho', serif;
    line-height: 1.3;
}

h1 {
    color: #fff;
    font-weight: 700; /* Bold for hero heading */
}

a {
    color: #5A4E3C;
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: #7A6955;
}

.btn {
    display: inline-block;
    background-color: #5A4E3C;
    color: white;
    padding: 0.8em 1.8em; /* Slightly more padding */
    border-radius: 4px;
    margin-top: 1em;
    transition: background-color 0.3s ease, transform 0.2s ease, box-shadow 0.3s ease; /* Add transform for subtle hover effect */
    text-align: center;
    border: none; /* Remove default button border */
    cursor: pointer;
    font-weight: 600;
    font-size: 1rem;
}

.btn:hover {
    background-color: #7A6955;
    transform: translateY(-2px); /* Lift button on hover */
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
}

.inner {
    max-width: 1100px; /* Consistent max-width for content */
    margin: 0 auto;
    padding: 0 1.5rem; /* Add some padding on sides for smaller screens */
}

.section-padding {
    padding: 80px 0; /* Consistent vertical padding for sections */
}

.section-title {
    font-size: clamp(1.8rem, 5vw, 2.8rem);
    margin-bottom: 1rem;
    text-align: center;
    color: #4a3e36;
}

.section-subtitle {
    font-size: 1.25rem;
    color: #666;
    text-align: center;
    margin-bottom: 2rem;
    line-height: 1.6;
}

.section-description {
    font-size: 1.05rem;
    color: #444;
    text-align: center;
    margin-bottom: 3rem;
    line-height: 1.7;
}

/* --- Utilities --- */
.text-white { color: #fff; }
.text-center { text-align: center; }
.d-flex { display: flex; }
.align-items-center { align-items: center; }
.justify-content-center { justify-content: center; }
.py-5 { padding-top: 3rem; padding-bottom: 3rem; }
.px-3 { padding-left: 1rem; padding-right: 1rem; }
.mb-5 { margin-bottom: 3rem; }
.fw-bold { font-weight: 700; }
.display-4 { font-size: calc(1.425rem + 2.1vw); } /* Responsive font size */
.display-5 { font-size: calc(1.325rem + 0.9vw); }
.fs-5 { font-size: 1.25rem; }
.lead { font-size: 1.25rem; font-weight: 300; }
.w-100 { width: 100%; }
.w-md-50 { width: 50%; } /* Bootstrap-like utility */
.rounded { border-radius: 0.5rem; }
.rounded-top { border-top-left-radius: 0.5rem; border-top-right-radius: 0.5rem; }
.rounded-bottom { border-bottom-left-radius: 0.5rem; border-bottom-right-radius: 0.5rem; }
.rounded-md-start { border-top-left-radius: 0.5rem; border-bottom-left-radius: 0.5rem; border-top-right-radius: 0; border-bottom-right-radius: 0; }
.rounded-md-end { border-top-right-radius: 0.5rem; border-bottom-right-radius: 0.5rem; border-top-left-radius: 0; border-bottom-left-radius: 0; }
.gap-4 { gap: 1.5rem; }
.mb-3 { margin-bottom: 1rem; }
.mt-3 { margin-top: 1rem; }
.small { font-size: 0.875em; }
.text-muted { color: #6c757d; }
.flex-column { flex-direction: column; }
.flex-md-row { flex-direction: row; }
.flex-md-row-reverse { flex-direction: row-reverse; }
.align-items-stretch { align-items: stretch; }
.justify-content-center { justify-content: center; }
.d-md-none { display: none; } /* Hide on medium screens and up */
.shadow { box-shadow: 0 0.5rem 1rem rgba(0,0,0,.15)!important; }
.p-4 { padding: 1.5rem; }
.bg-light { background-color: #f8f9fa!important; }
.bg-white { background-color: #fff!important; }
.btn-outline-dark {
    color: #5A4E3C;
    border: 1px solid #5A4E3C;
    background-color: transparent;
}
.btn-outline-dark:hover {
    color: #fff;
    background-color: #5A4E3C;
}