:root {
  --color-bg: #f7f7f5;
  --color-surface: #ffffff;
  --color-text: #1c1c1c;
  --color-text-secondary: #666666;
  --color-border: #dededa;
  --color-accent: #b98b3d;

  --max-page: 1440px;
  --max-text: 800px;
  --max-figure: 1200px;
  --max-figure-wide: 1400px;

  --radius: 8px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family:
    Inter,
    "Noto Sans JP",
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    sans-serif;
  font-size: 17px;
  line-height: 1.8;
}

img {
  max-width: 100%;
}

a {
  color: inherit;
}

button,
input,
textarea,
select {
  font: inherit;
}

:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 3px;
}

.container {
  width: min(calc(100% - 48px), var(--max-page));
  margin-inline: auto;
}

.text-container {
  max-width: var(--max-text);
}

.site-header {
  border-bottom: 1px solid var(--color-border);
  background: rgba(247, 247, 245, 0.96);
}

.site-header__inner {
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.site-brand {
  text-decoration: none;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.site-nav {
  display: flex;
  gap: 24px;
  font-size: 0.9rem;
}

.site-nav a {
  text-decoration: none;
  color: var(--color-text-secondary);
}

.site-nav a:hover {
  color: var(--color-text);
}

.hero {
  padding-block: 110px 96px;
}

.eyebrow,
.finding-number,
.figure-label {
  color: var(--color-accent);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

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

h1 {
  max-width: 1100px;
  margin-bottom: 32px;
  font-size: clamp(2.3rem, 5vw, 3.5rem);
  line-height: 1.25;
  letter-spacing: -0.03em;
}

h2 {
  margin-bottom: 28px;
  font-size: clamp(1.8rem, 3.2vw, 2.5rem);
  line-height: 1.35;
  letter-spacing: -0.02em;
}

.hero-intro,
.finding-copy {
  color: var(--color-text);
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  margin-top: 64px;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.metric {
  padding: 28px 22px;
}

.metric + .metric {
  border-left: 1px solid var(--color-border);
}

.metric-value,
.metric-label {
  display: block;
}

.metric-value {
  font-size: clamp(2rem, 4vw, 2.7rem);
  line-height: 1.1;
  font-weight: 700;
}

.metric-label {
  margin-top: 10px;
  color: var(--color-text-secondary);
  font-size: 0.83rem;
}

.section {
  padding-block: 110px;
}

.section-intro {
  padding-bottom: 60px;
}

.finding {
  padding-block: 140px;
}

.finding-number {
  margin-bottom: 14px;
}

.finding-network {
  border-top: 1px solid var(--color-border);
}

.finding-final {
  padding-bottom: 170px;
}

.figure-container {
  width: min(calc(100% - 48px), var(--max-figure));
  margin: 60px auto 0;
  padding: 20px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.figure-wide {
  width: min(calc(100% - 32px), var(--max-figure-wide));
}


.figure-container img {
  display: block;
  max-width: 100%;
  height: auto;
  margin-inline: auto;
}

.figure-open {
  display: flex;
  width: 100%;
  justify-content: center;
  padding: 0;
  border: 0;
  background: transparent;
  cursor: zoom-in;
}

figcaption {
  margin-top: 20px;
  color: var(--color-text-secondary);
  font-size: 0.875rem;
  line-height: 1.7;
}

figcaption strong {
  display: block;
  margin-bottom: 8px;
  color: var(--color-text);
  font-size: 0.95rem;
}

.figure-label {
  display: block;
  margin-bottom: 4px;
}

.interpretation {
  background: #efefeb;
}

.metric-grid--secondary {
  margin-block: 40px 48px;
}

.evidence-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-top: 44px;
}

.evidence-card {
  padding: 24px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.evidence-card strong,
.evidence-card span {
  display: block;
}

.evidence-card strong {
  font-size: 1.6rem;
}

.evidence-card span {
  margin: 3px 0 16px;
  color: var(--color-text-secondary);
  font-size: 0.9rem;
}

.evidence-principle {
  margin-top: 44px;
  font-size: 1.3rem;
  font-weight: 600;
}

.section-secondary {
  background: #f0f0ed;
}

.future-list {
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 20px;
  list-style: none;
  color: var(--color-text-secondary);
}

.site-footer {
  padding-block: 56px;
  border-top: 1px solid var(--color-border);
  color: var(--color-text-secondary);
  font-size: 0.86rem;
}

.site-footer strong {
  color: var(--color-text);
}

.site-footer p {
  margin-bottom: 2px;
}

.lightbox[hidden] {
  display: none;
}

.lightbox {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: grid;
  place-items: center;
  padding: 40px;
  overflow: auto;
  overscroll-behavior: contain;
  background: rgba(0, 0, 0, 0.9);
}

.lightbox img {
  display: block;
  max-width: 96vw;
  max-height: 90vh;
  object-fit: contain;
  touch-action: pan-x pan-y;
}

.lightbox-close {
  position: fixed;
  top: 18px;
  right: 22px;
  width: 48px;
  height: 48px;
  border: 1px solid rgba(255, 255, 255, 0.35);
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.35);
  color: #fff;
  cursor: pointer;
  font-size: 1.8rem;
  line-height: 1;
}

@media (max-width: 1023px) {
  .evidence-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 1023px) {
  .lightbox {
    display: block;
    place-items: initial;
    padding: 80px 24px 32px;
    text-align: left;
  }

  .lightbox img {
    width: min(180vw, var(--figure-native-width, 1448px));
    max-width: none;
    max-height: none;
    height: auto;
    margin: 0;
  }
}

@media (max-width: 767px) {
  body {
    font-size: 16px;
  }

  .container {
    width: min(calc(100% - 32px), var(--max-page));
  }

  .site-header__inner {
    min-height: 60px;
  }

  .site-nav {
    display: none;
  }

  .hero {
    padding-block: 78px 68px;
  }

  .metric-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .metric + .metric {
    border-left: 0;
  }

  .metric:nth-child(even) {
    border-left: 1px solid var(--color-border);
  }

  .metric:nth-child(n + 3) {
    border-top: 1px solid var(--color-border);
  }

  .section {
    padding-block: 80px;
  }

  .finding {
    padding-block: 88px;
  }

  .finding-final {
    padding-bottom: 110px;
  }

  .figure-container,
  .figure-wide {
    width: min(calc(100% - 24px), var(--max-figure));
    padding: 12px;
  }

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