:root {
    color-scheme: light;
    --chart-ink: #1f2d33;
    --chart-muted: #5c6b72;
    --chart-line: #d4dee3;
    --chart-soft: #f4f7f8;
    --chart-panel: #ffffff;
    --chart-blue: #245f8f;
    --chart-teal: #176f70;
    --chart-green: #3f7452;
    --chart-amber: #8a641d;
}

* {
    box-sizing: border-box;
}

body.chart-tools-page {
    margin: 0;
    background: #f7f9fa;
    color: var(--chart-ink);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, sans-serif;
    line-height: 1.7;
}

.chart-tools-page a {
    color: var(--chart-blue);
}

.chart-tools-shell {
    width: min(1180px, calc(100% - 32px));
    margin: 0 auto;
}

.chart-tools-header {
    padding: 28px 0 18px;
    border-bottom: 1px solid var(--chart-line);
    background: var(--chart-panel);
}

.chart-tools-breadcrumbs {
    display: flex;
    gap: 8px;
    margin-bottom: 18px;
    color: var(--chart-muted);
    flex-wrap: wrap;
    font-size: 0.9rem;
}

.chart-tools-kicker,
.chart-tools-label {
    margin: 0 0 6px;
    color: var(--chart-teal);
    font-size: 0.78rem;
    font-weight: 800;
    letter-spacing: 0;
}

.chart-tools-header h1 {
    max-width: 920px;
    margin: 0;
    font-size: 2.5rem;
    line-height: 1.18;
    letter-spacing: 0;
}

.chart-tools-lead {
    max-width: 760px;
    margin: 12px 0 0;
    color: #3f515a;
    font-size: 1.03rem;
}

.chart-tools-primary,
.chart-tools-secondary,
.chart-tools-note,
.chart-tools-comments {
    margin: 26px 0;
}

.chart-tools-section-heading {
    margin-bottom: 14px;
}

.chart-tools-section-heading h2,
.chart-tools-note h2 {
    margin: 0;
    font-size: 1.35rem;
    line-height: 1.35;
    letter-spacing: 0;
}

.chart-tools-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 12px;
}

.chart-tool-choice {
    display: grid;
    min-width: 0;
    min-height: 156px;
    padding: 16px;
    border: 1px solid var(--chart-line);
    border-top: 4px solid var(--chart-blue);
    border-radius: 6px;
    background: var(--chart-panel);
    align-content: start;
    text-decoration: none;
}

.chart-tool-choice:nth-child(4n + 2) {
    border-top-color: var(--chart-teal);
}

.chart-tool-choice:nth-child(4n + 3) {
    border-top-color: var(--chart-green);
}

.chart-tool-choice:nth-child(4n + 4) {
    border-top-color: var(--chart-amber);
}

.chart-tool-choice:hover,
.chart-tool-choice:focus {
    border-color: #8fa8b4;
    background: #f9fcfd;
    color: #174b72;
    text-decoration: none;
}

.chart-tool-choice:focus-visible {
    outline: 3px solid #d49b2b;
    outline-offset: 2px;
}

.chart-tool-choice strong {
    color: var(--chart-ink);
    font-size: 1.08rem;
    line-height: 1.35;
}

.chart-tool-name {
    margin-top: 3px;
    color: var(--chart-blue);
    font-size: 0.88rem;
    font-weight: 700;
}

.chart-tool-description {
    margin-top: 10px;
    color: var(--chart-muted);
    font-size: 0.9rem;
    line-height: 1.55;
    overflow-wrap: anywhere;
}

.chart-tools-ad {
    margin: 24px 0;
}

.chart-tools-secondary {
    border-top: 1px solid var(--chart-line);
    border-bottom: 1px solid var(--chart-line);
    background: var(--chart-panel);
    padding: 22px;
}

.chart-tools-link-group {
    display: grid;
    grid-template-columns: minmax(150px, 0.8fr) minmax(220px, 1.4fr) minmax(0, 3fr);
    gap: 16px;
    padding: 16px 0;
    border-top: 1px solid var(--chart-line);
    align-items: start;
}

.chart-tools-link-group:first-of-type {
    border-top: 0;
}

.chart-tools-link-group h3,
.chart-tools-link-group p {
    margin: 0;
}

.chart-tools-link-group h3 {
    font-size: 1rem;
    line-height: 1.45;
    letter-spacing: 0;
}

.chart-tools-link-group p {
    color: var(--chart-muted);
    font-size: 0.9rem;
}

.chart-tools-text-links {
    display: flex;
    min-width: 0;
    gap: 8px 14px;
    flex-wrap: wrap;
}

.chart-tools-text-links a {
    overflow-wrap: anywhere;
    font-weight: 700;
}

.chart-tools-note {
    padding: 18px 20px;
    border-left: 4px solid var(--chart-amber);
    background: #fffaf0;
}

.chart-tools-note p {
    margin: 8px 0 0;
    color: #5b523f;
}

.chart-tools-lower-nav {
    display: flex;
    gap: 10px 18px;
    margin: 24px 0;
    flex-wrap: wrap;
    justify-content: flex-end;
}

.chart-tools-comments {
    padding: 20px;
    border: 1px solid var(--chart-line);
    border-radius: 6px;
    background: var(--chart-panel);
}

.chart-tools-comments-note {
    margin: 0 0 18px;
    color: var(--chart-muted);
}

@media (max-width: 760px) {
    .chart-tools-header h1 {
        font-size: 1.75rem;
        line-height: 1.25;
    }

    .chart-tools-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 10px;
    }

    .chart-tool-choice {
        min-height: 148px;
        padding: 13px;
    }

    .chart-tool-choice strong {
        font-size: 1rem;
    }

    .chart-tool-name,
    .chart-tool-description {
        font-size: 0.82rem;
    }

    .chart-tools-link-group {
        grid-template-columns: 1fr;
        gap: 6px;
    }

    .chart-tools-lower-nav {
        justify-content: center;
    }
}

@media (max-width: 420px) {
    .chart-tools-shell {
        width: min(100% - 24px, 1180px);
    }

    .chart-tools-header {
        padding-top: 22px;
    }

    .chart-tools-primary,
    .chart-tools-secondary,
    .chart-tools-note,
    .chart-tools-comments {
        margin: 20px 0;
    }

    .chart-tools-secondary,
    .chart-tools-comments {
        padding: 16px;
    }
}