/* ========================================================
   Generic Subpage Layout (subpage.html)
   ======================================================== */
.subpage-layout {
    max-width: 800px; /* 読みやすさのため幅を絞る */
    margin: 0 auto 80px;
    padding: 0 20px;
}

.subpage-header {
    text-align: center;
    margin-bottom: 50px;
    padding: 40px 0;
    border-bottom: 3px solid var(--border-color);
}
.subpage-title { font-size: 36px; color: var(--charcoal); margin-bottom: 10px; }
.subpage-subtitle { font-size: 16px; color: var(--text-light); font-weight: 700; }

.subpage-content {
    background: #fff;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 50px;
    box-shadow: 4px 4px 0 var(--border-color);
}

.subpage-content h2 {
    font-size: 24px;
    color: var(--ims-primary);
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 10px;
    margin: 40px 0 20px;
}
.subpage-content h2:first-child { margin-top: 0; }

.subpage-content h3 {
    font-size: 18px;
    color: var(--charcoal);
    border-left: 5px solid var(--ims-primary);
    padding-left: 15px;
    margin: 30px 0 15px;
}

.subpage-content p {
    font-size: 15px;
    line-height: 1.8;
    color: #444;
    margin-bottom: 20px;
    font-weight: 500;
}

.subpage-content ul {
    list-style: disc;
    padding-left: 20px;
    margin-bottom: 20px;
    font-size: 15px;
    line-height: 1.8;
}
.subpage-content li { margin-bottom: 10px; font-weight: 700; }