body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: #f8f9fa;
    color: #333;
    margin: 0;
    padding: 20px;
}
.container {
    max-width: 1100px;
    margin: 0 auto;
}
header {
    margin-bottom: 20px;
    border-bottom: 1px solid #dee2e6;
    padding-bottom: 15px;
}
h1 {
    font-size: 22px;
    color: #2b3e50;
    margin: 0 0 5px 0;
}
p {
    font-size: 13px;
    color: #6c757d;
    margin: 0;
}

/* フィルターエリア */
.filter-bar {
    background-color: #fff;
    border: 1px solid #e3e6f0;
    border-radius: 4px;
    padding: 12px;
    margin-bottom: 20px;
    display: flex;
    gap: 10px;
    align-items: center;
    flex-wrap: wrap;
}
.filter-bar select {
    padding: 6px 12px;
    font-size: 13px;
    border: 1px solid #ced4da;
    border-radius: 4px;
    background-color: #fff;
}
.btn-toggle {
    padding: 6px 12px;
    font-size: 12px;
    border: 1px solid #ced4da;
    background-color: #fff;
    border-radius: 4px;
    cursor: pointer;
    color: #495057;
    transition: background-color 0.15s ease;
}
.btn-toggle:hover {
    background-color: #e9ecef;
}

/* テーブルスタイル */
.coin-group {
    background-color: #fff;
    border: 1px solid #dee2e6;
    border-radius: 4px;
    margin-bottom: 10px;
    overflow: hidden;
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}

.group-header {
    background-color: #f1f3f5;
    padding: 10px 15px;
    color: #495057;
    border-bottom: 1px solid #dee2e6;
    display: flex;
    align-items: center;
    justify-content: space-between;
    cursor: pointer;
    user-select: none;
    transition: background-color 0.15s ease;
}
.group-header:hover {
    background-color: #e9ecef;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: bold;
    font-size: 14px;
    flex-shrink: 0;
}
.arrow {
    display: inline-block;
    font-size: 10px;
    transition: transform 0.2s ease;
    color: #6c757d;
}

.header-specs {
    display: flex;
    gap: 10px;
    font-size: 11px;
    color: #495057;
    flex-grow: 1;
    margin-left: 20px;
    margin-right: 20px;
    flex-wrap: wrap;
}
.spec-item {
    background-color: #fff;
    padding: 1px 6px;
    border: 1px solid #e3e6f0;
    border-radius: 4px;
    white-space: nowrap;
}
.spec-variety {
    background-color: #fff5f5;
    border-color: #ffe3e3;
    color: #c9302c;
    font-weight: 500;
}

.badge {
    font-size: 11px;
    padding: 3px 8px;
    border-radius: 3px;
    font-weight: normal;
    flex-shrink: 0;
}

/* 折りたたみの定義 */
.coin-group.collapsed table {
    display: none;
}
.coin-group.collapsed .group-header {
    border-bottom: none;
}
.coin-group.collapsed .arrow {
    transform: rotate(-90deg);
}

/* 素材別カラーバッジ */
.badge-silver { background-color: #e2e3e5; color: #383d41; }
.badge-bronze { background-color: #f8d7da; color: #721c24; }
.badge-copper { background-color: #fce8e6; color: #a83232; }
.badge-aluminum { background-color: #e8f4fd; color: #1d4ed8; }
.badge-brass { background-color: #fff3cd; color: #856404; }
.badge-nickel { background-color: #e2e3e5; color: #495057; }
.badge-tin { background-color: #e9ecef; color: #495057; }
.badge-gold { background-color: #fff9db; color: #b28900; }

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
    text-align: left;
}
th {
    background-color: #fafbfc;
    color: #6c757d;
    font-weight: 600;
    border-bottom: 1px solid #dee2e6;
    padding: 8px 15px;
    font-size: 11px;
    text-transform: uppercase;
}
td {
    padding: 10px 15px;
    border-bottom: 1px solid #f1f3f5;
    vertical-align: middle;
}
tr:last-child td {
    border-bottom: none;
}
tr:hover {
    background-color: #f8f9fa;
}

.mintage {
    font-family: "Courier New", Courier, monospace;
    font-weight: bold;
    color: #2b3e50;
}
.variety {
    color: #d9534f;
    font-weight: 500;
}
.note {
    color: #6c757d;
    font-size: 12px;
}
.empty-row {
    color: #adb5bd;
    font-style: italic;
}