/* =========================================================
   Knowledge article pages
   ========================================================= */
.art { border-bottom: var(--line-thick); }
.art-hero {
  max-width: var(--maxw); margin: 0 auto;
  padding: clamp(2.4rem,5vw,4.4rem) var(--gutter) clamp(1.8rem,3vw,2.6rem);
  border-bottom: var(--line);
}
.art-hero__meta { display: flex; align-items: center; gap: .8rem; flex-wrap: wrap; font-family: var(--mono); font-size: .72rem; text-transform: uppercase; letter-spacing: .08em; }
.art-hero__cat { background: var(--ink); color: var(--paper); padding: .3em .7em; }
.art-hero__cat.acc { background: var(--blue); color: #fff; }
.art-hero h1 {
  font-family: var(--gothic); font-weight: 900;
  font-size: clamp(2rem,5vw,4rem); line-height: 1.04; letter-spacing: -.01em;
  margin: 1.4rem 0 0; text-wrap: balance; max-width: 20ch;
}
.art-hero__deck { font-family: var(--mincho); font-weight: 700; font-size: clamp(1.1rem,2vw,1.5rem); line-height: 1.6; margin-top: 1.4rem; max-width: 56ch; color: var(--ink-soft); }
.art-hero__by { display: flex; align-items: center; gap: 1.2rem; flex-wrap: wrap; margin-top: 1.8rem; font-family: var(--mono); font-size: .74rem; letter-spacing: .04em; }
.art-hero__by .who { display: flex; align-items: center; gap: .6rem; }
.art-hero__by .av { width: 34px; height: 34px; background: var(--blue); color: #fff; display: grid; place-items: center; font-weight: 700; font-family: var(--gothic); }
.art-hero__by .sep { opacity: .4; }

.art-figure {
  max-width: var(--maxw); margin: 0 auto; border-bottom: var(--line);
  background: var(--ink); color: var(--paper);
  aspect-ratio: 21 / 7; display: grid; place-items: center; position: relative; overflow: hidden;
}
.art-figure::before { content: ""; position: absolute; inset: 0; background-image: linear-gradient(to right, color-mix(in srgb, var(--paper) 8%, transparent) 1px, transparent 1px); background-size: 64px 100%; }
.art-figure__lab { position: relative; font-family: var(--mono); font-size: .8rem; letter-spacing: .12em; text-transform: uppercase; opacity: .6; }
.art-figure__big { position: absolute; font-family: var(--gothic); font-weight: 900; font-size: 16vw; line-height: 1; color: color-mix(in srgb, var(--blue) 40%, transparent); }

.art-body { max-width: 880px; margin: 0 auto; padding: clamp(2.4rem,5vw,4rem) var(--gutter); }
.art-body > * + * { margin-top: 1.5rem; }
.art-body p { font-size: 1.08rem; line-height: 1.95; }
.art-body .lead { font-size: 1.2rem; line-height: 1.9; font-weight: 500; }
.art-body h2 { font-family: var(--gothic); font-weight: 900; font-size: clamp(1.5rem,3vw,2.1rem); line-height: 1.2; margin-top: 3rem; padding-top: 1.6rem; border-top: var(--line); text-wrap: balance; }
.art-body h3 { font-family: var(--gothic); font-weight: 700; font-size: 1.2rem; margin-top: 2rem; }
.art-body ul { list-style: none; display: flex; flex-direction: column; gap: .8rem; padding-left: 0; }
.art-body ul li { position: relative; padding-left: 1.6rem; line-height: 1.8; }
.art-body ul li::before { content: "—"; position: absolute; left: 0; top: 0; color: var(--blue); font-weight: 700; }
.art-body blockquote { border-left: 6px solid var(--blue); padding: .4rem 0 .4rem 1.6rem; margin: 2.4rem 0; font-family: var(--mincho); font-weight: 700; font-size: clamp(1.3rem,2.4vw,1.7rem); line-height: 1.55; }
.art-callout { background: var(--paper-3); border: var(--line); padding: 1.6rem 1.8rem; }
.art-callout .k { font-family: var(--mono); font-size: .7rem; text-transform: uppercase; letter-spacing: .1em; color: var(--blue); font-weight: 700; }
.art-callout .v { font-family: var(--gothic); font-weight: 900; font-size: clamp(1.8rem,4vw,2.8rem); line-height: 1.05; margin-top: .5rem; }
.art-callout p { margin-top: .6rem; font-size: .95rem; color: var(--ink-soft); }
.art-body em.mk { background: var(--acid); font-style: normal; padding: 0 .15em; }
.art-body a { text-decoration: underline; text-decoration-color: var(--blue); text-decoration-thickness: 1.5px; text-underline-offset: 3px; }
.art-body a:hover { color: var(--blue); }

/* foot / related */
.art-foot { border-top: var(--line-thick); }
.art-foot__bar { max-width: var(--maxw); margin: 0 auto; display: flex; justify-content: space-between; align-items: center; gap: 1rem; padding: 1.4rem var(--gutter); flex-wrap: wrap; }
.art-foot__bar a.back { font-family: var(--mono); font-size: .78rem; text-transform: uppercase; letter-spacing: .06em; }
.art-foot__bar a.back:hover { color: var(--blue); }

.art-cta { background: var(--ink); color: var(--paper); }
.art-cta__in { max-width: var(--maxw); margin: 0 auto; padding: clamp(2.4rem,5vw,4rem) var(--gutter); display: flex; justify-content: space-between; align-items: center; gap: 2rem; flex-wrap: wrap; }
.art-cta h3 { font-family: var(--gothic); font-weight: 900; font-size: clamp(1.6rem,3.4vw,2.6rem); line-height: 1.1; }
.art-cta .btn { background: var(--acid); color: var(--ink); border-color: var(--acid); }
.art-cta .btn:hover { background: var(--paper); border-color: var(--paper); }

/* related grid reuses .report styles */
.related { border-top: var(--line); }
.related__h { max-width: var(--maxw); margin: 0 auto; padding: clamp(1.6rem,3vw,2.2rem) var(--gutter) 0; font-family: var(--mono); font-size: .74rem; text-transform: uppercase; letter-spacing: .12em; color: var(--blue); font-weight: 700; }

/* この記事の監修者 */
.supervisor { max-width: 880px; margin: 0 auto; padding: clamp(2rem,4vw,3rem) var(--gutter); display: grid; grid-template-columns: 140px 1fr; gap: clamp(1.4rem,3vw,2.2rem); align-items: start; }
.supervisor__photo { width: 140px; height: 140px; border: var(--line); overflow: hidden; background: var(--paper-3); }
.supervisor__photo img { width: 100%; height: 100%; object-fit: cover; display: block; }
.supervisor__kick { font-family: var(--mono); font-size: .7rem; text-transform: uppercase; letter-spacing: .14em; color: var(--blue); font-weight: 700; }
.supervisor__role { font-family: var(--mono); font-size: .76rem; letter-spacing: .04em; color: var(--ink-soft); margin-top: .8rem; }
.supervisor__name { font-family: var(--gothic); font-weight: 900; font-size: clamp(1.4rem,2.4vw,1.9rem); line-height: 1.1; letter-spacing: -.01em; margin: .25rem 0 0; display: flex; align-items: baseline; gap: .7rem; flex-wrap: wrap; }
.supervisor__name .en { font-family: var(--mono); font-weight: 400; font-size: .8rem; letter-spacing: .06em; color: var(--ink-soft); text-transform: none; }
.supervisor__bio { list-style: none; padding: 0; margin: 1.1rem 0 0; display: flex; flex-direction: column; gap: .5rem; }
.supervisor__bio li { position: relative; padding-left: 1.3rem; line-height: 1.7; font-size: .92rem; color: var(--ink); }
.supervisor__bio li::before { content: "—"; position: absolute; left: 0; color: var(--blue); }
.supervisor__note { margin-top: 1rem; font-family: var(--mincho); font-size: .95rem; line-height: 1.8; color: var(--ink-soft); }
@media (max-width: 640px){
  .supervisor { grid-template-columns: 1fr; gap: 1.2rem; }
  .supervisor__photo { width: 120px; height: 120px; }
}