.content-main {
    width: min(1180px, calc(100% - 40px));
    margin: 0 auto;
}

.content-hero {
    max-width: 850px;
    padding: 46px 0 30px;
}

.breadcrumb {
    margin-bottom: 22px;
    color: var(--ink-soft);
    font-size: 0.84rem;
}

.breadcrumb ol {
    margin: 0;
    padding: 0;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    list-style: none;
}

.breadcrumb li + li::before {
    content: "/";
    margin-right: 8px;
    color: var(--field-line);
}

.breadcrumb a,
.content-article a {
    color: var(--green);
    text-underline-offset: 4px;
}

.content-kicker {
    margin-bottom: 12px;
    color: var(--green);
    font-size: 0.78rem;
    font-weight: 800;
    letter-spacing: 0.09em;
    text-transform: uppercase;
}

.content-hero h1 {
    max-width: 780px;
}

.content-lead {
    max-width: 780px;
    margin-bottom: 22px;
    color: var(--ink-soft);
    font-size: clamp(1.05rem, 1.8vw, 1.25rem);
    line-height: 1.65;
}

.content-meta {
    margin: 0;
    display: flex;
    flex-wrap: wrap;
    gap: 10px 22px;
    color: var(--ink-soft);
    font-size: 0.88rem;
}

.guide-index-hero {
    max-width: 900px;
}

.guide-index-section {
    margin-bottom: 52px;
    padding: clamp(24px, 4vw, 42px);
    border: 1px solid var(--line);
    border-radius: 24px;
    background: var(--surface);
    box-shadow: var(--shadow);
}

.guide-index-heading {
    margin-bottom: 26px;
    display: flex;
    justify-content: space-between;
    gap: 28px;
    align-items: end;
}

.guide-index-heading h2 {
    margin: 0;
    color: var(--green-dark);
    font-size: clamp(1.55rem, 2.5vw, 2.15rem);
}

.guide-index-heading > p {
    max-width: 520px;
    margin: 0;
    color: var(--ink-soft);
    line-height: 1.65;
}

.guide-card-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
}

.guide-card {
    padding: 24px;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    border: 1px solid var(--line);
    border-radius: 18px;
    background: var(--surface-alt);
}

.guide-card h2 {
    margin: 0 0 12px;
    color: var(--green-dark);
    font-size: 1.25rem;
    line-height: 1.3;
}

.guide-card h2 a {
    color: inherit;
    text-decoration: none;
}

.guide-card h2 a:hover {
    color: var(--green);
    text-decoration: underline;
    text-underline-offset: 4px;
}

.guide-card > p:not(.content-kicker) {
    margin: 0 0 20px;
    color: var(--ink-soft);
    line-height: 1.65;
}

.guide-card-link {
    margin-top: auto;
    color: var(--green-dark);
    font-weight: 750;
    text-underline-offset: 4px;
}

.content-layout {
    padding-bottom: 48px;
    display: grid;
    grid-template-columns: minmax(210px, 0.3fr) minmax(0, 0.7fr);
    gap: 34px;
    align-items: start;
}

.content-toc {
    position: sticky;
    top: 22px;
    padding: 22px;
    border: 1px solid var(--line);
    border-radius: 18px;
    background: var(--surface);
    box-shadow: var(--shadow);
}

.content-toc strong {
    display: block;
    margin-bottom: 12px;
    color: var(--green-dark);
}

.content-toc ol {
    margin: 0;
    padding-left: 20px;
}

.content-toc li + li {
    margin-top: 9px;
}

.content-toc a {
    color: var(--ink-soft);
    font-size: 0.88rem;
    line-height: 1.4;
    text-decoration: none;
}

.content-toc a:hover {
    color: var(--green);
    text-decoration: underline;
    text-underline-offset: 4px;
}

.content-article {
    min-width: 0;
    padding: 34px clamp(22px, 4vw, 48px);
    border: 1px solid var(--line);
    border-radius: 24px;
    background: var(--surface);
    box-shadow: var(--shadow);
}

.content-article h2 {
    margin: 0 0 16px;
    color: var(--green-dark);
    font-size: clamp(1.45rem, 2.4vw, 2rem);
    line-height: 1.2;
    letter-spacing: -0.025em;
}

.content-article h3 {
    margin: 28px 0 10px;
    color: var(--green-dark);
    font-size: 1.12rem;
    line-height: 1.35;
}

.content-article p,
.content-article li,
.content-article dd,
.content-article dt {
    line-height: 1.72;
}

.content-article p,
.content-article ul,
.content-article ol {
    margin-bottom: 16px;
}

.content-article li + li {
    margin-top: 7px;
}

.content-section {
    padding: 36px 0;
    scroll-margin-top: 24px;
    border-top: 1px solid var(--line);
}

.content-section:first-child {
    padding-top: 0;
    border-top: 0;
}

.summary-card,
.content-notice {
    padding: 22px;
    border: 1px solid rgba(27, 102, 122, 0.2);
    border-radius: 16px;
    background: var(--green-pale);
}

.content-section.summary-card:first-child {
    padding: 28px 22px 22px;
}

.summary-card h2,
.content-notice h3 {
    margin-top: 0;
}

.summary-card ul,
.content-notice p:last-child {
    margin-bottom: 0;
}

.content-notice.warning {
    border-color: rgba(177, 91, 26, 0.28);
    background: #fff6ed;
}

.method-grid,
.definition-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
}

.method-card,
.definition-grid > div {
    padding: 18px;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: var(--surface-alt);
}

.method-card h3,
.definition-grid dt {
    margin: 0 0 8px;
    color: var(--green-dark);
    font-weight: 750;
}

.method-card p,
.definition-grid dd {
    margin: 0;
    color: var(--ink-soft);
}

.formula {
    margin: 18px 0;
    padding: 18px 20px;
    overflow-x: auto;
    border: 1px solid rgba(27, 102, 122, 0.2);
    border-radius: 14px;
    color: var(--green-dark);
    background: #f1f7f8;
    font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
    font-size: 0.9rem;
    line-height: 1.7;
    white-space: pre-wrap;
}

.table-wrap {
    margin: 18px 0;
    overflow-x: auto;
}

.content-article table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

.content-article th,
.content-article td {
    padding: 12px 14px;
    border: 1px solid var(--line);
    text-align: left;
    vertical-align: top;
    line-height: 1.55;
}

.content-article th {
    color: var(--green-dark);
    background: var(--surface-alt);
}

.article-author {
    margin-top: 36px;
    padding: 22px;
    display: grid;
    gap: 8px;
    border: 1px solid var(--line);
    border-radius: 16px;
    background: var(--surface-alt);
}

.article-author strong {
    color: var(--green-dark);
}

.article-author p {
    margin: 0;
    color: var(--ink-soft);
}

.article-author a {
    color: var(--green-dark);
}

.editorial-disclosure {
    padding-top: 12px;
    border-top: 1px solid var(--line);
    font-size: 0.88rem;
}

.related-content,
.guide-sources {
    margin-top: 30px;
    padding-top: 30px;
    border-top: 1px solid var(--line);
}

.related-content h2,
.guide-sources h2 {
    font-size: 1.35rem;
}

.related-content li + li,
.guide-sources li + li {
    margin-top: 12px;
}

.related-content small,
.guide-sources small {
    display: block;
    margin-top: 3px;
    color: var(--ink-soft);
    line-height: 1.5;
}

.source-citation {
    font-size: 0.92em;
    white-space: nowrap;
}

.content-cta {
    margin-top: 28px;
    padding: 24px;
    border-radius: 18px;
    color: #fff;
    background: var(--green-dark);
}

.content-cta h2 {
    color: #fff;
}

.content-cta p {
    color: rgba(255, 255, 255, 0.82);
}

.content-cta a {
    display: inline-flex;
    padding: 11px 16px;
    border-radius: 10px;
    color: var(--green-dark);
    background: #fff;
    font-weight: 750;
    text-decoration: none;
}

@media (max-width: 900px) {
    .content-layout {
        grid-template-columns: 1fr;
    }

    .content-toc {
        position: static;
    }
}

@media (max-width: 620px) {
    .content-main {
        width: min(100% - 24px, 1180px);
    }

    .content-hero {
        padding-top: 30px;
    }

    .content-layout {
        gap: 18px;
    }

    .guide-index-heading {
        align-items: flex-start;
        flex-direction: column;
        gap: 10px;
    }

    .guide-card-grid {
        grid-template-columns: 1fr;
    }

    .content-article {
        padding: 26px 18px;
        border-radius: 18px;
    }

    .method-grid,
    .definition-grid {
        grid-template-columns: 1fr;
    }

    .formula {
        padding: 15px;
        font-size: 0.82rem;
    }
}