:root {
  color-scheme: dark;
  --yk-bg: #0a0908;
  --yk-paper: #d8c7a5;
  --yk-paper-deep: #bea77d;
  --yk-ink: #18130e;
  --yk-cream: #eee2ca;
  --yk-muted: #b5aa94;
  --yk-red: #941f25;
  --yk-line: rgba(215, 194, 153, 0.22);
  --yk-panel: #15110d;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  background: var(--yk-bg);
}

body {
  margin: 0;
  min-width: 320px;
  overflow-x: hidden;
  color: var(--yk-cream);
  background:
    radial-gradient(circle at 15% 2%, rgba(148, 31, 37, 0.12), transparent 27rem),
    radial-gradient(circle at 80% 0, rgba(215, 194, 153, 0.09), transparent 24rem),
    var(--yk-bg);
  font-family: "Yu Gothic", "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
  line-height: 1.9;
}

body::before {
  position: fixed;
  z-index: -1;
  inset: 0;
  pointer-events: none;
  content: "";
  opacity: 0.12;
  background-image: repeating-linear-gradient(93deg, transparent 0 7px, rgba(255, 255, 255, 0.025) 8px, transparent 9px 15px);
}

a {
  color: inherit;
}

img {
  display: block;
  max-width: 100%;
}

.yk-header {
  display: flex;
  width: min(1180px, calc(100% - 48px));
  min-height: 82px;
  margin: 0 auto;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  border-bottom: 1px solid var(--yk-line);
}

.yk-brand {
  display: inline-grid;
  text-decoration: none;
  line-height: 1.2;
}

.yk-brand b {
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-size: 1.18rem;
  letter-spacing: 0.18em;
}

.yk-brand small {
  margin-top: 5px;
  color: var(--yk-muted);
  font-family: Arial, sans-serif;
  font-size: 0.55rem;
  letter-spacing: 0.25em;
}

.yk-header nav {
  display: flex;
  align-items: center;
  gap: clamp(14px, 2.2vw, 30px);
  color: #c7bda9;
  font-size: 0.76rem;
}

.yk-header nav a {
  text-underline-offset: 5px;
  text-decoration-color: transparent;
}

.yk-header nav a:hover,
.yk-header nav a:focus-visible {
  color: #fff0ce;
  text-decoration-color: currentColor;
}

.yk-index-hero,
.yk-detail-hero {
  width: min(1120px, calc(100% - 48px));
  margin: 0 auto;
}

.yk-detail-hero figure {
  min-width: 0;
  margin: 0;
}

.yk-index-hero {
  display: grid;
  min-height: 520px;
  grid-template-columns: minmax(0, 1.2fr) minmax(280px, 0.8fr);
  align-items: center;
  gap: clamp(36px, 7vw, 100px);
  padding: 76px 0 84px;
}

.yk-kicker,
.yk-section-kicker,
.yk-entry-no {
  color: #c7aa72;
  font-family: Arial, sans-serif;
  font-size: 0.66rem;
  font-weight: 800;
  letter-spacing: 0.24em;
}

.yk-index-hero h1,
.yk-detail-title h1 {
  margin: 16px 0 22px;
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-weight: 500;
  letter-spacing: 0.08em;
  line-height: 1.25;
}

.yk-index-hero h1 {
  font-size: clamp(3.2rem, 7vw, 6rem);
}

.yk-index-hero p {
  max-width: 660px;
  margin: 0;
  color: #c9c0af;
}

.yk-hero-mark {
  position: relative;
  display: grid;
  width: min(340px, 72vw);
  aspect-ratio: 1;
  margin: 0 auto;
  place-items: center;
  border: 1px solid rgba(215, 194, 153, 0.3);
  border-radius: 50%;
}

.yk-hero-mark::before,
.yk-hero-mark::after {
  position: absolute;
  content: "";
  border-radius: 50%;
}

.yk-hero-mark::before {
  inset: 22px;
  border: 1px dashed rgba(215, 194, 153, 0.27);
}

.yk-hero-mark::after {
  width: 64%;
  height: 64%;
  background: radial-gradient(circle at 35% 35%, #e1cb9e, #9a794d 72%, #3b291b 100%);
  box-shadow: 0 0 60px rgba(218, 191, 136, 0.17);
}

.yk-hero-mark span {
  z-index: 1;
  color: #1d150e;
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-size: clamp(2.4rem, 7vw, 4.2rem);
  font-weight: 900;
  letter-spacing: -0.06em;
  writing-mode: vertical-rl;
}

.yk-intro {
  padding: 72px max(24px, calc((100% - 1120px) / 2));
  background: var(--yk-paper);
  color: var(--yk-ink);
  border-block: 9px solid #21170f;
}

.yk-intro-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
  gap: clamp(36px, 7vw, 90px);
}

.yk-intro h2,
.yk-section-heading h2,
.yk-article-body h2,
.yk-sources h2,
.yk-related h2 {
  margin: 8px 0 0;
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-weight: 600;
  letter-spacing: 0.07em;
  line-height: 1.45;
}

.yk-intro h2 {
  font-size: clamp(2rem, 4vw, 3.4rem);
}

.yk-intro p {
  margin: 0;
}

.yk-intro p + p {
  margin-top: 14px;
}

.yk-index-main,
.yk-related {
  padding: 96px max(24px, calc((100% - 1120px) / 2));
}

.yk-section-heading {
  display: flex;
  margin-bottom: 34px;
  align-items: end;
  justify-content: space-between;
  gap: 28px;
}

.yk-section-heading h2,
.yk-related h2 {
  font-size: clamp(2rem, 4vw, 3.2rem);
}

.yk-section-heading p {
  max-width: 460px;
  margin: 0;
  color: var(--yk-muted);
  font-size: 0.84rem;
}

.yk-card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.yk-card {
  min-width: 0;
  overflow: hidden;
  background: var(--yk-panel);
  border: 1px solid var(--yk-line);
}

.yk-card-link {
  display: block;
  height: 100%;
  text-decoration: none;
}

.yk-art {
  position: relative;
  overflow: hidden;
  background: #211810;
}

.yk-card .yk-art {
  aspect-ratio: 3 / 2;
}

.yk-art img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.yk-card .yk-art img {
  transition: transform 450ms ease, filter 450ms ease;
}

.yk-card-link:hover .yk-art img,
.yk-card-link:focus-visible .yk-art img {
  filter: contrast(1.05) saturate(1.05);
  transform: scale(1.025);
}

.yk-seal {
  position: absolute;
  right: clamp(9px, 2vw, 18px);
  bottom: clamp(9px, 2vw, 18px);
  display: grid;
  width: clamp(46px, 7vw, 68px);
  height: clamp(46px, 7vw, 68px);
  padding: 5px;
  grid-template-columns: repeat(2, 1fr);
  grid-template-rows: repeat(2, 1fr);
  align-items: center;
  justify-items: center;
  color: #f3dcc0;
  background: rgba(139, 21, 28, 0.92);
  border: 2px solid #c14a49;
  outline: 1px solid rgba(243, 220, 192, 0.56);
  outline-offset: -5px;
  box-shadow: 0 3px 12px rgba(0, 0, 0, 0.32);
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-size: clamp(0.72rem, 1.6vw, 1rem);
  font-weight: 900;
  line-height: 1;
  transform: rotate(-2deg);
}

.yk-card-copy {
  padding: 22px;
}

.yk-card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  color: #bfa46f;
  font-size: 0.66rem;
  letter-spacing: 0.1em;
}

.yk-card h3 {
  margin: 9px 0 4px;
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-size: 1.65rem;
  letter-spacing: 0.08em;
}

.yk-card h3 small {
  margin-left: 8px;
  color: var(--yk-muted);
  font-family: "Yu Gothic", sans-serif;
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: 0.04em;
}

.yk-card-copy > p {
  margin: 0;
  color: #c0b7a5;
  font-size: 0.82rem;
  line-height: 1.75;
}

.yk-card-more {
  display: inline-block;
  margin-top: 14px;
  color: #d2b77f;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.yk-editorial-note {
  display: grid;
  margin-top: 52px;
  padding: 30px;
  grid-template-columns: auto 1fr;
  gap: 22px;
  color: #d4c9b5;
  background: rgba(148, 31, 37, 0.08);
  border: 1px solid rgba(148, 31, 37, 0.33);
}

.yk-editorial-note b {
  color: #d7b77a;
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-size: 1.1rem;
}

.yk-editorial-note p {
  margin: 0;
  font-size: 0.82rem;
}

.yk-breadcrumbs {
  width: min(1120px, calc(100% - 48px));
  margin: 24px auto 0;
  color: var(--yk-muted);
  font-size: 0.72rem;
}

.yk-breadcrumbs a {
  color: #d5be90;
  text-underline-offset: 4px;
}

.yk-breadcrumbs span {
  margin: 0 8px;
  opacity: 0.55;
}

.yk-detail-hero {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(420px, 1.15fr);
  align-items: center;
  gap: clamp(42px, 7vw, 92px);
  padding: 64px 0 88px;
}

.yk-detail-title h1 {
  font-size: clamp(3.5rem, 7vw, 6.8rem);
}

.yk-reading {
  display: block;
  margin-top: -10px;
  color: #b5aa94;
  font-size: 0.8rem;
  letter-spacing: 0.18em;
}

.yk-detail-title h2 {
  margin: 22px 0 14px;
  color: #d5bd8b;
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-size: clamp(1.2rem, 2.6vw, 1.7rem);
  font-weight: 500;
  line-height: 1.55;
}

.yk-detail-title > p {
  margin: 0;
  color: #c9c0af;
  font-size: 0.94rem;
}

.yk-detail-hero .yk-art {
  aspect-ratio: 3 / 2;
  border: 1px solid rgba(215, 194, 153, 0.26);
  box-shadow: 0 28px 70px rgba(0, 0, 0, 0.36);
}

.yk-caption {
  display: flex;
  padding: 9px 0 0;
  justify-content: space-between;
  gap: 16px;
  color: var(--yk-muted);
  font-size: 0.65rem;
}

.yk-facts {
  padding: 58px max(24px, calc((100% - 1120px) / 2));
  background: var(--yk-paper);
  color: var(--yk-ink);
  border-block: 9px solid #21170f;
}

.yk-facts ol {
  display: grid;
  margin: 0;
  padding: 0;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: rgba(42, 30, 20, 0.28);
  list-style: none;
  counter-reset: yk-fact;
}

.yk-facts li {
  position: relative;
  min-height: 134px;
  padding: 28px 22px 24px 66px;
  background: var(--yk-paper);
  counter-increment: yk-fact;
}

.yk-facts li::before {
  position: absolute;
  top: 29px;
  left: 22px;
  color: var(--yk-red);
  content: counter(yk-fact, decimal-leading-zero);
  font-family: Arial, sans-serif;
  font-size: 0.72rem;
  font-weight: 900;
}

.yk-article-shell {
  display: grid;
  width: min(860px, calc(100% - 48px));
  margin: 0 auto;
  grid-template-columns: minmax(0, 1fr);
  align-items: start;
  padding: 96px 0;
}

.yk-article-body section + section {
  margin-top: 70px;
}

.yk-article-body h2 {
  position: relative;
  padding-top: 21px;
  font-size: clamp(1.7rem, 3.5vw, 2.55rem);
}

.yk-article-body h2::before {
  position: absolute;
  top: 0;
  left: 0;
  width: 55px;
  height: 2px;
  background: var(--yk-red);
  content: "";
}

.yk-article-body p {
  margin: 23px 0 0;
  color: #d2c9b9;
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-size: 1.03rem;
  letter-spacing: 0.025em;
  line-height: 2.15;
}

.yk-inline-figure {
  width: min(100%, 760px);
  margin: 70px 0;
}

.yk-inline-figure .yk-art {
  aspect-ratio: 3 / 2;
  border: 1px solid rgba(215, 194, 153, 0.22);
  box-shadow: 0 24px 56px rgba(0, 0, 0, 0.32);
}

.yk-inline-figure .yk-caption {
  padding-top: 11px;
}

.yk-scene-figure {
  width: min(100%, 820px);
}

.yk-scene-figure .yk-art::after {
  position: absolute;
  inset: 0;
  border: 1px solid rgba(255, 255, 255, 0.04);
  content: "";
  pointer-events: none;
}

.yk-timeline {
  margin: 70px 0;
  padding: 30px clamp(20px, 4vw, 34px) 34px;
  background: linear-gradient(145deg, rgba(48, 38, 27, 0.74), rgba(22, 19, 15, 0.92));
  border: 1px solid var(--yk-line);
}

.yk-timeline h2 {
  margin-top: 0;
}

.yk-timeline ol {
  display: grid;
  margin: 30px 0 0;
  padding: 0;
  gap: 0;
  list-style: none;
}

.yk-timeline li {
  display: grid;
  position: relative;
  grid-template-columns: minmax(88px, 0.28fr) minmax(0, 1fr);
  gap: 22px;
  padding: 20px 0 20px 22px;
  border-left: 1px solid rgba(190, 40, 31, 0.64);
}

.yk-timeline li + li {
  border-top: 1px solid rgba(212, 190, 148, 0.12);
}

.yk-timeline li::before {
  position: absolute;
  top: 27px;
  left: -5px;
  width: 9px;
  height: 9px;
  background: var(--yk-red);
  border-radius: 50%;
  box-shadow: 0 0 0 4px rgba(190, 40, 31, 0.13);
  content: "";
}

.yk-timeline b {
  color: #d5bd8b;
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-size: 0.86rem;
  letter-spacing: 0.08em;
}

.yk-timeline span {
  color: #d2c9b9;
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-size: 0.92rem;
  line-height: 1.85;
}

.yk-aside {
  position: sticky;
  top: 28px;
  padding: 22px;
  color: #c8beac;
  background: var(--yk-panel);
  border: 1px solid var(--yk-line);
}

.yk-aside b {
  display: block;
  margin-bottom: 9px;
  color: #d5bd8b;
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-size: 1.1rem;
}

.yk-aside p {
  margin: 0;
  font-size: 0.76rem;
}

.yk-aside a {
  display: inline-block;
  margin-top: 14px;
  color: #d5bd8b;
  font-size: 0.72rem;
  text-underline-offset: 4px;
}

.yk-sources {
  padding: 76px max(24px, calc((100% - 1040px) / 2));
  color: var(--yk-ink);
  background: var(--yk-paper);
}

.yk-sources h2 {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
}

.yk-source-note {
  margin: 10px 0 26px;
  font-size: 0.83rem;
}

.yk-source-list {
  display: grid;
  margin: 0;
  padding: 0;
  gap: 1px;
  background: rgba(42, 30, 20, 0.25);
  list-style: none;
}

.yk-source-list li {
  padding: 18px 20px;
  background: #deceaf;
}

.yk-source-list a {
  color: #5c1c1e;
  font-weight: 800;
  text-underline-offset: 4px;
}

.yk-source-list span {
  display: block;
  margin-top: 4px;
  font-size: 0.76rem;
}

.yk-related {
  background: #0d0b09;
}

.yk-related .yk-card-grid {
  margin-top: 30px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.yk-pagination {
  display: grid;
  margin-top: 28px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.yk-pagination a {
  display: grid;
  padding: 18px 20px;
  color: #d4c7b1;
  background: var(--yk-panel);
  border: 1px solid var(--yk-line);
  text-decoration: none;
}

.yk-pagination a:last-child {
  text-align: right;
}

.yk-pagination small {
  color: #b99a62;
  font-size: 0.63rem;
  letter-spacing: 0.13em;
}

.yk-pagination b {
  margin-top: 4px;
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
}

.yk-footer {
  display: grid;
  padding: 58px 24px;
  place-items: center;
  border-top: 1px solid var(--yk-line);
  text-align: center;
}

.yk-footer b {
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-size: 1.35rem;
  letter-spacing: 0.2em;
}

.yk-footer p {
  margin: 8px 0 16px;
  color: var(--yk-muted);
  font-size: 0.76rem;
}

.yk-footer a {
  color: #d5bd8b;
  font-size: 0.76rem;
  text-underline-offset: 4px;
}

@media (max-width: 900px) {
  .yk-index-hero,
  .yk-detail-hero {
    grid-template-columns: 1fr;
  }

  .yk-index-hero {
    padding-top: 68px;
  }

  .yk-hero-mark {
    width: min(300px, 72vw);
  }

  .yk-card-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .yk-detail-title {
    max-width: 720px;
  }

  .yk-detail-hero .yk-art {
    max-width: 760px;
  }

  .yk-article-shell {
    grid-template-columns: 1fr;
  }

  .yk-aside {
    position: static;
    grid-row: 1;
  }
}

@media (max-width: 680px) {
  .yk-header {
    width: calc(100% - 32px);
    min-height: 70px;
  }

  .yk-header nav a:not(:first-child) {
    display: none;
  }

  .yk-index-hero,
  .yk-detail-hero {
    width: calc(100% - 32px);
  }

  .yk-index-hero h1 {
    font-size: clamp(3rem, 16vw, 4.5rem);
  }

  .yk-intro,
  .yk-index-main,
  .yk-related,
  .yk-facts,
  .yk-sources {
    padding-inline: 16px;
  }

  .yk-intro-grid,
  .yk-section-heading,
  .yk-card-grid,
  .yk-facts ol,
  .yk-related .yk-card-grid {
    display: grid;
    grid-template-columns: 1fr;
  }

  .yk-section-heading {
    align-items: start;
    gap: 12px;
  }

  .yk-editorial-note {
    grid-template-columns: 1fr;
  }

  .yk-breadcrumbs,
  .yk-article-shell {
    width: calc(100% - 32px);
  }

  .yk-detail-hero {
    padding-top: 46px;
  }

  .yk-detail-title h1 {
    font-size: clamp(3rem, 17vw, 5rem);
  }

  .yk-caption {
    display: grid;
  }

  .yk-article-shell {
    padding-block: 72px;
  }

  .yk-article-body p {
    font-size: 0.98rem;
    line-height: 2;
  }

  .yk-inline-figure {
    margin-block: 52px;
  }

  .yk-timeline {
    margin-block: 52px;
    padding: 24px 18px 28px;
  }

  .yk-timeline li {
    grid-template-columns: 1fr;
    gap: 7px;
    padding: 18px 0 18px 20px;
  }

  .yk-pagination {
    grid-template-columns: 1fr;
  }

  .yk-pagination a:last-child {
    text-align: left;
  }
}

@media (max-width: 390px) {
  .yk-header nav {
    display: none;
  }

  .yk-card h3 {
    font-size: 1.45rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .yk-card .yk-art img {
    transition: none;
  }
}