.history-map {
    overflow-x: auto;
    font-size: 0.9rem;
    -webkit-overflow-scrolling: touch;
}

.history-pc {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    position: relative;
    padding-top: 1rem;
    padding-bottom: 2rem;
}

.history-pc::before {
    content: "";
    position: absolute;
    left: 36px;
    top: 0.5rem;
    bottom: 0.5rem;
    width: 2px;
    background: #dee2e6;
}

.history-row {
    display: grid;
    grid-template-columns: 210px 1fr;
    align-items: start;
    column-gap: 1.5rem;
}

.era-axis {
    position: relative;
    padding-left: 3rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 0.35rem;
    min-height: 120px;
}

.era-marker {
    position: absolute;
    left: 36px;
    top: 10px;
    transform: translate(-50%, -50%);
    width: 18px;
    height: 18px;
    border-radius: 999px;
    background: #ffffff;
    border: 3px solid #adb5bd;
    z-index: 2;
}

.era-marker span {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.50rem;
    font-weight: 700;
    color: #6c757d;
}

.era-label {
    font-weight: 700;
    color: #111827;
    text-decoration: none;
    position: relative;
    padding: 0.25rem 0.7rem;
    border-radius: 999px;
    border: 1px solid #e5e7eb;
    background: #ffffff;
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    box-shadow: 0 1px 0 rgba(15, 23, 42, 0.04);
    transition: color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease, box-shadow 0.2s ease;
}

.era-label::after {
    content: "›";
    font-weight: 700;
    color: #9ca3af;
}

.era-label:hover {
    color: #0d6efd;
    border-color: #cfe2ff;
    background: #f8fbff;
    box-shadow: 0 2px 6px rgba(13, 110, 253, 0.12);
}

.era-label:hover::after {
    color: #0d6efd;
}

.era-keywords {
    color: #6c757d;
    font-size: 0.8rem;
}

.era-period {
    color: #495057;
    font-size: 0.78rem;
    font-weight: 600;
}

.era-cell {
    min-height: 120px;
}

.era-content {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    min-height: 120px;
}

.era-block.card {
    border-left: 4px solid #0d6efd;
    background: #f8fbff;
    min-width: 260px;
    max-width: 360px;
    flex: 1 1 auto;
}

.era-block .card-body {
    padding: 0.75rem;
}

.category-title {
    font-weight: 700;
    font-size: 0.8rem;
    color: #495057;
    padding-bottom: 0.35rem;
    margin-bottom: 0.5rem;
    border-bottom: 1px solid #e9ecef;
}

.event-chip {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.2rem 0.45rem;
    border-radius: 999px;
    border: 1px dashed #cfe2ff;
    background: #ffffff;
    font-size: 0.72rem;
    color: #0d6efd;
    text-decoration: none;
    min-height: 28px;
}

.book-chip {
    display: inline-flex;
    padding: 0.2rem 0.5rem;
    border-radius: 6px;
    margin: 0.15rem 0.2rem 0 0;
    font-size: 0.72rem;
    background: #e9ecef;
    color: #495057;
    text-decoration: none;
}

.history-row.is-selected .era-marker {
    border-color: #0d6efd;
    box-shadow: 0 0 0 4px rgba(13, 110, 253, 0.15);
}

.history-row.is-selected .era-axis {
    color: #0d6efd;
}

@media (max-width: 1199.98px) {
    .history-map {
        overflow-x: hidden;
    }

    .history-row {
        grid-template-columns: 185px 1fr;
        column-gap: 1rem;
    }

    .era-axis {
        padding-left: 2.25rem;
        min-height: auto;
    }

    .era-marker {
        left: 25px;
    }

    .history-pc::before {
        left: 24px;
    }

    .era-content {
        flex-direction: column;
    }

    .era-block.card {
        min-width: 0;
        max-width: none;
        width: 100%;
    }
}

@media (max-width: 767.98px) {
    .event-chip {
        padding: 0.35rem 0.7rem;
        min-height: 36px;
        font-size: 0.78rem;
        border-radius: 14px;
    }
}