:root {
  --ink: #26231f;
  --ink-soft: #59544d;
  --muted: #7d756b;
  --paper: #f6f1e8;
  --paper-deep: #e9dfcf;
  --surface: #fbf8f1;
  --line: #d6ccbc;
  --accent: #7f0019;
  --black: #171512;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: Helvetica, Arial, "Hiragino Sans", "Yu Gothic", "Meiryo", sans-serif;
  font-size: 15px;
  line-height: 1.72;
}

a {
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.24em;
}

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

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1,
h2,
h3 {
  font-weight: 400;
  letter-spacing: 0;
}

h1 {
  max-width: 760px;
  margin-bottom: 28px;
  font-size: clamp(2.6rem, 7vw, 6.5rem);
  line-height: 0.98;
}

h2 {
  margin-bottom: 0;
  font-size: clamp(1.6rem, 3.6vw, 3.9rem);
  line-height: 1.05;
}

h3 {
  margin-bottom: 8px;
  font-size: 1.05rem;
  line-height: 1.45;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  min-height: 64px;
  padding: 0 clamp(18px, 3.8vw, 56px);
  background: rgba(246, 241, 232, 0.92);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(12px);
}

.brand,
.site-nav a,
.text-button,
.filter-button {
  font-size: 0.82rem;
  font-weight: 700;
  text-decoration: none;
}

.brand {
  white-space: nowrap;
}

.site-nav {
  display: flex;
  gap: clamp(14px, 3vw, 34px);
  color: var(--ink-soft);
}

.product-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(360px, 0.92fr);
  min-height: calc(100vh - 64px);
  border-bottom: 1px solid var(--line);
}

.product-visual {
  min-height: 620px;
  padding: clamp(18px, 3.6vw, 56px);
  display: grid;
  align-items: center;
  background: var(--paper-deep);
  border-right: 1px solid var(--line);
}

.product-visual img {
  width: 100%;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  object-position: center;
  filter: saturate(0.82) contrast(0.94);
}

.product-summary {
  align-self: center;
  padding: clamp(28px, 6vw, 76px);
}

.kicker {
  margin-bottom: 18px;
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
}

.summary-copy {
  max-width: 640px;
  margin-bottom: 34px;
  color: var(--ink-soft);
  font-size: 1.02rem;
}

.product-facts {
  margin: 0 0 34px;
  border-top: 1px solid var(--line);
}

.product-facts div {
  display: grid;
  grid-template-columns: 130px minmax(0, 1fr);
  gap: 20px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.product-facts dt {
  color: var(--muted);
}

.product-facts dd {
  margin: 0;
  font-weight: 700;
}

.text-button {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  padding: 0 22px;
  color: var(--surface);
  background: var(--black);
}

.statement {
  padding: clamp(70px, 11vw, 150px) clamp(18px, 8vw, 120px);
  border-bottom: 1px solid var(--line);
}

.statement p {
  max-width: 1120px;
  margin: 0 auto;
  font-size: clamp(1.7rem, 4.2vw, 4.8rem);
  line-height: 1.18;
  letter-spacing: 0;
}

.section {
  padding: clamp(72px, 9vw, 132px) clamp(18px, 5vw, 72px);
  border-bottom: 1px solid var(--line);
}

.section-heading {
  display: grid;
  grid-template-columns: minmax(160px, 0.34fr) minmax(0, 1fr);
  gap: clamp(22px, 5vw, 70px);
  max-width: 1240px;
  margin: 0 auto 46px;
}

.member-list,
.timeline,
.note-grid,
.source-list {
  max-width: 1240px;
  margin-inline: auto;
}

.member-list {
  border-top: 1px solid var(--line);
}

.member-row {
  display: grid;
  grid-template-columns: 80px minmax(180px, 0.42fr) minmax(0, 1fr);
  gap: 28px;
  align-items: baseline;
  padding: 26px 0;
  border-bottom: 1px solid var(--line);
}

.member-index,
.tag,
.timeline-item time {
  font-variant-numeric: tabular-nums;
}

.member-index {
  color: var(--accent);
  font-weight: 700;
}

.member-row p {
  margin-bottom: 0;
  color: var(--ink-soft);
}

.timeline-section {
  background: var(--surface);
}

.filter-bar {
  max-width: 1240px;
  margin: -18px auto 30px;
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.filter-button {
  min-height: 48px;
  padding: 0 20px;
  color: var(--ink);
  background: transparent;
  border: 0;
  border-right: 1px solid var(--line);
  cursor: pointer;
}

.filter-button.is-active {
  color: var(--surface);
  background: var(--accent);
}

.timeline {
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.timeline-item {
  display: grid;
  grid-template-columns: 170px minmax(0, 1fr);
  gap: clamp(22px, 5vw, 74px);
  padding: 34px 0;
  border-bottom: 1px solid var(--line);
}

.timeline-item.is-hidden {
  display: none;
}

.timeline-item time {
  color: var(--accent);
  font-weight: 700;
}

.timeline-item p {
  max-width: 760px;
  margin-bottom: 0;
  color: var(--ink-soft);
}

.tag {
  display: inline-block;
  margin-bottom: 10px;
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 700;
}

.note-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-top: 1px solid var(--line);
}

.note-grid article {
  min-height: 220px;
  padding: 28px 26px 30px 0;
  border-right: 1px solid var(--line);
}

.note-grid article + article {
  padding-left: 26px;
}

.note-grid article:last-child {
  border-right: 0;
}

.note-grid p {
  color: var(--ink-soft);
}

.source-list {
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.source-list li {
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.source-list a {
  color: var(--ink);
}

.site-footer {
  padding: 34px clamp(18px, 5vw, 72px) 50px;
  color: var(--surface);
  background: var(--black);
}

.site-footer p {
  max-width: 1240px;
  margin: 0 auto;
  color: rgba(251, 248, 241, 0.72);
  font-size: 0.86rem;
}

@media (max-width: 960px) {
  .product-hero {
    grid-template-columns: 1fr;
  }

  .product-visual {
    min-height: auto;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .product-visual img {
    aspect-ratio: 16 / 10;
  }

  .section-heading,
  .member-row,
  .timeline-item {
    grid-template-columns: 1fr;
  }

  .member-row,
  .timeline-item {
    gap: 8px;
  }

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

  .note-grid article,
  .note-grid article + article {
    min-height: auto;
    padding: 24px 0;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }
}

@media (max-width: 620px) {
  body {
    font-size: 14px;
  }

  .site-header {
    align-items: flex-start;
    flex-direction: column;
    gap: 6px;
    padding-block: 14px;
  }

  .site-nav {
    width: 100%;
    justify-content: space-between;
  }

  .product-summary {
    padding: 32px 18px 46px;
  }

  .product-facts div {
    grid-template-columns: 1fr;
    gap: 2px;
  }

  .filter-button {
    flex: 1 1 50%;
    border-bottom: 1px solid var(--line);
  }

  .statement {
    padding-block: 62px;
  }
}