.exchange-main,
.exchange-footer {
    width: min(1120px, calc(100% - 48px));
    margin: 0 auto;
}

.exchange-footer a {
    font-size: 12px;
    font-weight: 700;
    color: var(--color-text-secondary);
}

.exchange-footer a:hover { color: var(--color-accent); }

.exchange-layout {
    padding: 86px 0 104px;
    display: grid;
    grid-template-columns: 190px minmax(0, 760px);
    justify-content: space-between;
    gap: clamp(64px, 10vw, 150px);
    align-items: start;
}

.exchange-rail {
    position: sticky;
    top: 94px;
}

.exchange-stamp {
    width: 150px;
    aspect-ratio: 1;
    margin-bottom: 26px;
    padding: 20px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    background: var(--color-text);
    color: var(--color-bg-raised);
}

.exchange-stamp span,
.exchange-stamp strong {
    font-family: var(--font-display);
    font-size: 27px;
    font-weight: 600;
    line-height: 0.9;
    letter-spacing: -0.035em;
}

.exchange-stamp strong { margin-top: -30px; }
.exchange-stamp small { font-size: 8.5px; font-weight: 700; letter-spacing: 0.11em; text-transform: uppercase; opacity: 0.72; }

.exchange-rail > p {
    margin-top: 15px;
    font-size: 11px;
    line-height: 1.65;
    color: var(--color-text-muted);
}

.exchange-rail strong { color: var(--color-text-secondary); }
.exchange-rail a { color: var(--color-accent); font-weight: 700; }

.exchange-rail .exchange-updated {
    display: flex;
    flex-direction: column;
    gap: 2px;
    padding: 11px 0;
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.exchange-updated strong {
    font-size: 9px;
    letter-spacing: 0.12em;
}

.exchange-updated time {
    font-size: 11px;
    font-weight: 600;
    color: var(--color-text-secondary);
}

.exchange-chapter-nav {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-top: 22px;
}

.exchange-chapter-nav strong {
    font-size: 9px;
    letter-spacing: 0.12em;
}

.exchange-chapter-nav a {
    padding: 7px 9px;
    border-left: 2px solid var(--color-border);
    color: var(--color-text-secondary);
    font-size: 11px;
    line-height: 1.45;
}

.exchange-chapter-nav a:hover,
.exchange-chapter-nav a[aria-current="page"] {
    border-color: var(--color-accent);
    color: var(--color-accent);
    background: var(--color-accent-soft);
}

.exchange-pagination {
    display: flex;
    justify-content: space-between;
    gap: 18px;
    margin-top: 70px;
    padding-top: 20px;
    border-top: 1px solid var(--color-border);
}

.exchange-pagination a {
    display: flex;
    flex-direction: column;
    max-width: 48%;
    font-size: 15px;
    font-weight: 600;
    line-height: 1.45;
}

.exchange-pagination a span {
    margin-bottom: 5px;
    color: var(--color-text-muted);
    font-size: 10px;
    letter-spacing: 0.1em;
}

.exchange-pagination-next { margin-left: auto; text-align: right; }

.exchange-article {
    min-width: 0;
    font-size: 16px;
    line-height: 1.85;
    color: var(--color-text-secondary);
}

.exchange-article > h1:first-child {
    margin: 0 0 28px;
    font-family: var(--font-display);
    font-size: clamp(48px, 6vw, 70px);
    font-weight: 600;
    line-height: 0.98;
    letter-spacing: -0.045em;
    color: var(--color-text);
}

.exchange-article h2 {
    margin: 70px 0 23px;
    padding-top: 19px;
    border-top: 1px solid var(--color-border);
    font-family: var(--font-display);
    font-size: clamp(31px, 4vw, 43px);
    font-weight: 600;
    line-height: 1.12;
    letter-spacing: -0.03em;
    color: var(--color-text);
}

.exchange-article h3 {
    margin: 39px 0 13px;
    font-family: var(--font-display);
    font-size: 25px;
    font-weight: 600;
    line-height: 1.25;
    color: var(--color-text);
}

.exchange-article p { margin: 0 0 20px; }
.exchange-article strong { color: var(--color-text); }
.exchange-article a { color: var(--color-accent); text-decoration: underline; text-underline-offset: 3px; }
.exchange-article a:hover { color: var(--color-accent-hover); }

.exchange-article blockquote {
    margin: 0 0 34px;
    padding: 22px 25px;
    border-left: 3px solid var(--color-accent);
    background: var(--color-accent-soft);
    color: var(--color-text-secondary);
}

.exchange-article blockquote p:last-child { margin-bottom: 0; }

.exchange-article ul,
.exchange-article ol {
    margin: 0 0 24px;
    padding-left: 1.35em;
}

.exchange-article li { margin: 9px 0; padding-left: 4px; }
.exchange-article li::marker { color: var(--color-accent); font-weight: 700; }

.exchange-article table {
    width: 100%;
    margin: 28px 0 38px;
    display: block;
    overflow-x: auto;
    border-collapse: collapse;
    font-size: 13px;
    line-height: 1.55;
}

.exchange-article thead { background: var(--color-text); color: var(--color-bg-raised); }
.exchange-article th { font-weight: 700; text-align: left; }
.exchange-article th,
.exchange-article td { min-width: 150px; padding: 12px 14px; border: 1px solid var(--color-border); vertical-align: top; }
.exchange-article tbody tr:nth-child(even) { background: rgba(255, 254, 250, 0.62); }

.exchange-article hr {
    margin: 72px 0;
    border: 0;
    border-top: 1px solid var(--color-border);
}

.exchange-article code {
    padding: 2px 5px;
    background: var(--color-accent-soft);
    font-size: 0.88em;
    color: var(--color-text);
}

.exchange-footer {
    padding: 34px 0 44px;
    display: flex;
    justify-content: space-between;
    gap: 28px;
    border-top: 1px solid var(--color-border);
}

.exchange-footer p { font-family: var(--font-display); font-size: 18px; font-weight: 600; }
.exchange-footer p span { margin-left: 5px; font-family: var(--font-body); font-size: 9px; letter-spacing: 0.12em; color: var(--color-text-muted); }
.exchange-footer div { display: flex; gap: 20px; }

@media (max-width: 800px) {
    .exchange-layout { grid-template-columns: 150px minmax(0, 1fr); gap: 42px; }
    .exchange-stamp { width: 125px; padding: 16px; }
    .exchange-stamp span, .exchange-stamp strong { font-size: 23px; }
}

@media (max-width: 680px) {
    .exchange-main, .exchange-footer { width: min(1120px, calc(100% - 32px)); }
    .exchange-layout { padding: 58px 0 76px; grid-template-columns: 1fr; gap: 46px; }
    .exchange-rail { position: static; display: grid; grid-template-columns: 98px 1fr; gap: 0 22px; }
    .exchange-stamp { width: 98px; grid-row: 1 / 3; margin: 0; padding: 12px; }
    .exchange-stamp span, .exchange-stamp strong { font-size: 18px; }
    .exchange-stamp strong { margin-top: -18px; }
    .exchange-stamp small { font-size: 6.5px; }
    .exchange-rail > p { margin-top: 0; }
    .exchange-chapter-nav { grid-column: 1 / -1; }
    .exchange-article { font-size: 15px; line-height: 1.8; }
    .exchange-article > h1:first-child { font-size: clamp(43px, 13vw, 58px); }
    .exchange-article h2 { margin-top: 58px; }
    .exchange-article th, .exchange-article td { min-width: 135px; padding: 10px 12px; }
    .exchange-footer { align-items: start; flex-direction: column; }
}

@media (max-width: 430px) {
    .exchange-rail { grid-template-columns: 84px 1fr; gap: 0 18px; }
    .exchange-stamp { width: 84px; }
    .exchange-stamp span, .exchange-stamp strong { font-size: 15px; }
    .exchange-stamp strong { margin-top: -14px; }
}