.chart-modal[hidden] {
    display: none;
}

.chart-modal {
    position: fixed;
    inset: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
}

.chart-modal-overlay {
    position: absolute;
    inset: 0;
    background-color: rgba(10, 4, 18, 0.7);
    backdrop-filter: blur(4px);
}

.chart-modal-panel {
    position: relative;
    width: 100%;
    max-width: 720px;
    max-height: 85vh;
    background-color: var(--black-purple);
    border: 1px solid rgba(254, 235, 241, 0.15);
    border-radius: 20px;
    box-shadow: 0 20px 60px -20px rgba(0, 0, 0, 0.7);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.chart-modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 24px 12px;
}

.chart-modal-header h2 {
    color: var(--common-white);
    font-size: 1.4rem;
}

.chart-modal-close {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: none;
    background-color: rgba(254, 235, 241, 0.12);
    color: var(--common-white);
    font-size: 1.4rem;
    line-height: 1;
    cursor: pointer;
    transition: background-color .15s ease-in;
}

.chart-modal-close:hover,
.chart-modal-close:focus-visible {
    background-color: var(--hover-purple);
}

.chart-modal-tabs {
    display: flex;
    gap: 10px;
    padding: 0 24px 16px;
}

.chart-tab {
    flex: 1;
    padding: 10px;
    border-radius: 999px;
    border: 1.5px solid rgba(254, 235, 241, 0.3);
    background-color: transparent;
    color: var(--common-white);
    font-weight: 600;
    cursor: pointer;
    transition: background-color .15s ease-in, border-color .15s ease-in;
}

.chart-tab:hover,
.chart-tab:focus-visible {
    border-color: var(--common-white);
}

.chart-tab-active {
    background-color: var(--hover-purple);
    border-color: var(--hover-purple);
}

.chart-modal-body {
    overflow-y: auto;
    padding: 4px 24px 24px;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.chart-section h3 {
    color: var(--common-white);
    opacity: 0.85;
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 10px;
}

.chart-grid {
    display: grid;
    grid-template-columns: repeat(var(--chart-cols, 5), 1fr);
    gap: 8px;
}

.chart-cell {
    background-color: var(--common-white);
    border-radius: 8px;
    box-shadow: 0px 0px 8px var(--random-purple);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 8px 4px;
    min-height: 56px;
}

.chart-cell-empty {
    background-color: transparent;
    box-shadow: none;
}

.chart-kana {
    font-family: "Noto Serif JP", serif;
    font-optical-sizing: auto;
    font-weight: 600;
    font-size: clamp(15px, 2vw, 20px);
    color: var(--black-purple);
}

.chart-romaji {
    font-size: 11px;
    color: #666;
}

@media (max-width: 768px) {
    .chart-modal {
        padding: 0;
    }

    .chart-modal-panel {
        max-width: 100%;
        max-height: 100vh;
        height: 100%;
        border-radius: 0;
    }

    .chart-grid {
        gap: 6px;
    }

    .chart-cell {
        min-height: 48px;
    }
}

@media (max-width: 380px) {
    .chart-modal-header h2 {
        font-size: 1.2rem;
    }

    .chart-tab {
        font-size: 0.9rem;
        padding: 9px;
    }
}