:root {
  --bg: #111111;
  --bg-alt: #1a1a1a;
  --card-bg: #222222;
  --text: #f0f0f0;
  --muted: #888888;
  --line: #2a2a2a;
  --accent: #f0f0f0;
  --accent-soft: #b0b0b0;
  --max-width: 1120px;
  --narrow-width: 760px;
  --radius: 12px;
  --shadow: 0 1px 0 0 var(--line);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-size: 1rem;
  color: var(--text);
  background: var(--bg);
  font-family:
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    "Hiragino Sans",
    "Hiragino Kaku Gothic ProN",
    "Yu Gothic",
    Meiryo,
    sans-serif;
  line-height: 1.8;
  letter-spacing: 0.01em;
}

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

a {
  color: inherit;
  text-decoration: none;
}

.container {
  width: min(calc(100% - 40px), var(--max-width));
  margin: 0 auto;
}

.narrow {
  width: min(calc(100% - 40px), var(--narrow-width));
}

.section {
  padding: 112px 0;
}

.section-alt {
  background: var(--bg-alt);
}

.section-label {
  margin: 0 0 14px;
  color: var(--muted);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

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

h1 {
  font-size: clamp(2.6rem, 5vw, 5rem);
  line-height: 1.1;
  letter-spacing: -0.04em;
  margin-bottom: 24px;
}

h2 {
  font-size: clamp(2rem, 3vw, 3rem);
  line-height: 1.2;
  letter-spacing: -0.03em;
  margin-bottom: 32px;
}

h3 {
  font-size: 1.3rem;
  line-height: 1.35;
  margin-bottom: 12px;
}

p,
li,
dd {
  color: var(--text);
}

/* ─── Header ─── */

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(17, 17, 17, 0.92);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(12px);
}

.header-inner,
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  gap: 20px;
}

.brand {
  font-weight: 800;
  letter-spacing: -0.02em;
  flex-shrink: 0;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
}

.site-nav a {
  color: var(--muted);
  font-size: 0.95rem;
  transition: color 0.15s;
}

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

.nav-new {
  display: inline-block;
  margin-left: 5px;
  padding: 1px 6px;
  border-radius: 4px;
  font-size: 0.68rem;
  font-weight: 800;
  border: 1px solid #1a3a2a;
  color: #4caf82;
  vertical-align: middle;
}


/* ─── Hero ─── */

.hero {
  padding: 160px 0 130px;
}

.hero-inner {
  max-width: 820px;
}

.hero-labels {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 32px;
}

.hero-label {
  display: inline-block;
  padding: 4px 12px;
  border: 1px solid var(--line);
  border-radius: 4px;
  font-size: 0.8rem;
  color: var(--muted);
  letter-spacing: 0.03em;
}

.lead {
  font-size: 1.15rem;
  color: var(--accent-soft);
  max-width: 640px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-top: 40px;
}

/* ─── Buttons ─── */

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 24px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.95rem;
  transition: transform 0.15s ease, opacity 0.15s ease;
  cursor: pointer;
}

.button:hover {
  transform: translateY(-1px);
}

.button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.button-primary {
  background: var(--accent);
  color: var(--bg);
}

.button-secondary {
  border: 1px solid var(--line);
  background: transparent;
  color: var(--text);
}

.button-secondary:hover {
  border-color: #444;
}

.button-large {
  min-height: 56px;
  padding: 0 36px;
  font-size: 1.05rem;
}

/* ─── Grid ─── */

.grid {
  display: grid;
  gap: 24px;
}

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

.three-col {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

/* ─── Cards & Features ─── */

.card,
.feature {
  background: var(--card-bg);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 32px;
  transition: border-color 0.2s ease;
}

.section:not(.section-alt) .card {
  background: var(--bg-alt);
}

.card:hover,
.feature:hover {
  border-color: #3a3a3a;
}

.card-subtitle {
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.feature p,
.card p {
  margin-bottom: 0;
  color: var(--accent-soft);
}

.card-link {
  display: inline-block;
  margin-top: 20px;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--muted);
  transition: color 0.15s;
}

.card-link:hover {
  color: var(--text);
}

/* ─── Tags ─── */

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 20px;
}

.tag {
  display: inline-block;
  padding: 3px 10px;
  border: 1px solid var(--line);
  border-radius: 4px;
  font-size: 0.78rem;
  color: var(--muted);
  letter-spacing: 0.02em;
}

/* ─── Person ─── */

.profile-layout {
  display: flex;
  gap: 40px;
  align-items: flex-start;
}

.profile-body {
  flex: 1;
}

.person-name {
  font-size: 1.15rem;
  font-weight: 800;
  margin-bottom: 4px;
}

.person-name span {
  display: inline-block;
  margin-left: 10px;
  color: var(--muted);
  font-weight: 500;
  font-size: 0.95rem;
}

/* ─── News ─── */

.news-list {
  margin: 0;
}

.news-list div {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
  transition: background 0.15s;
}

.news-list div:hover {
  background: rgba(255, 255, 255, 0.03);
}

.news-list dt {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  white-space: nowrap;
  color: var(--text);
}

.news-list dd {
  margin: 0;
  color: var(--accent-soft);
}

.news-tag {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  border: 1px solid var(--line);
  color: var(--muted);
}

.news-tag--award {
  border-color: #4a3a20;
  color: #c8942a;
}

.news-tag--new {
  border-color: #1a3a2a;
  color: #4caf82;
  font-weight: 800;
}

/* ─── Definition List ─── */

.definition-list {
  margin: 0;
}

.definition-list div {
  display: grid;
  grid-template-columns: 130px 1fr;
  gap: 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.definition-list dt {
  font-weight: 700;
  color: var(--muted);
  font-size: 0.9rem;
}

.definition-list dd {
  margin: 0;
}

/* ─── Contact ─── */

.section-contact {
  background: var(--bg);
}

.section-contact h2 {
  font-size: clamp(1.6rem, 2.5vw, 2.2rem);
  letter-spacing: -0.02em;
  margin-bottom: 20px;
}

/* ─── Footer ─── */

.site-footer {
  border-top: 1px solid var(--line);
  background: var(--bg);
}

.site-footer p {
  margin: 0;
  color: var(--muted);
  font-size: 0.88rem;
}

/* ─── Responsive: 900px ─── */

@media (max-width: 900px) {
  .two-col,
  .three-col {
    grid-template-columns: 1fr;
  }

  .header-inner {
    min-height: auto;
    padding: 14px 0;
    align-items: flex-start;
    flex-direction: column;
  }

  .site-nav {
    gap: 16px;
  }

  .section {
    padding: 88px 0;
  }

  .hero {
    padding: 100px 0 80px;
  }

}

/* ─── Responsive: 640px ─── */

@media (max-width: 640px) {
  .container,
  .narrow {
    width: min(calc(100% - 28px), var(--max-width));
  }

  .section {
    padding: 72px 0;
  }

  .hero {
    padding: 80px 0 64px;
  }

  .card,
  .feature {
    padding: 24px;
  }

  .definition-list div {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .news-list div {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .news-list dt {
    white-space: normal;
  }

  .hero-actions {
    flex-direction: column;
  }

  .button {
    width: 100%;
  }

  .profile-layout {
    flex-direction: column;
    gap: 24px;
  }

}