:root {
  --text-color: #0a1f33;
  --muted-color: #4b6884;
  --accent-color: #1aa2a5;
  --accent-strong: #1163c4;
  --surface-color: #ffffff;
  --background-color: #e6eef7;
  --border-color: #b6c5d6;
  --banner-start: #0f3d74;
  --banner-end: #0f9c9b;
  --max-width: clamp(18rem, 85vw, 72rem);
  --radius: 0;
  --shadow: 0 6px 18px rgba(15, 48, 91, 0.1);
}

* {
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Helvetica Neue", "Hiragino Kaku Gothic ProN", "Meiryo", Arial, sans-serif;
  color: var(--text-color);
  background: radial-gradient(circle at 20% 20%, rgba(17, 156, 155, 0.12), transparent 60%), radial-gradient(circle at 80% 0%, rgba(17, 99, 196, 0.12), transparent 55%), var(--background-color);
  line-height: 1.6;
}

a {
  color: var(--accent-color);
  text-decoration: none;
}

a:hover,
a:focus {
  text-decoration: underline;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: auto;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.skip-link:focus {
  position: fixed;
  left: clamp(1rem, 5vw, 3rem);
  top: clamp(1rem, 5vw, 3rem);
  width: auto;
  height: auto;
  padding: 0.75rem 1.5rem;
  background: var(--surface-color);
  color: var(--accent-color);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  z-index: 999;
}

.site-header {
  background: rgba(255, 255, 255, 0.92);
  border-bottom: 1px solid rgba(15, 61, 116, 0.12);
  backdrop-filter: blur(6px);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: clamp(0.75rem, 2vw, 1.5rem) clamp(1rem, 5vw, 2rem);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 600;
  font-size: clamp(1rem, 0.9rem + 0.6vw, 1.4rem);
  color: var(--text-color);
}

.brand img {
  width: clamp(3rem, 9vw, 3.75rem);
  height: clamp(3rem, 9vw, 3.75rem);
  object-fit: cover;
  border: 2px solid rgba(15, 61, 116, 0.25);
}

.nav-toggle {
  display: none;
  background: transparent;
  border: none;
  cursor: pointer;
  color: var(--text-color);
}

.nav-toggle svg {
  width: 24px;
  height: 24px;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(0.75rem, 1.5vw, 2rem);
}

.site-nav a {
  position: relative;
  padding: 0.4rem 0;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--muted-color);
}

.site-nav a[aria-current="page"] {
  color: var(--accent-strong);
}

.site-nav a[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.35rem;
  width: 100%;
  height: 2px;
  background: var(--accent-strong);
  border-radius: 999px;
}

.lang-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  border: 1px solid rgba(17, 99, 196, 0.25);
  background: rgba(255, 255, 255, 0.85);
  font-size: 0.95rem;
}

.lang-option {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 2.1rem;
  padding: 0.2rem 0.4rem;
  font-weight: 600;
  color: var(--muted-color);
  border-radius: 999px;
  transition: background 0.2s ease, color 0.2s ease;
}

.lang-option.is-active {
  color: #ffffff;
  background: var(--accent-strong);
  box-shadow: 0 0 0 1px rgba(15, 61, 116, 0.15);
}

.lang-toggle a.lang-option:hover,
.lang-toggle a.lang-option:focus {
  text-decoration: none;
  color: var(--accent-color);
}

.lang-separator {
  color: var(--border-color);
}

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: clamp(2.5rem, 6vw, 4.5rem) clamp(1rem, 5vw, 2rem) clamp(3rem, 8vw, 5rem);
}

.hero {
  display: grid;
  gap: clamp(1.5rem, 3vw, 3rem);
  grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr));
  align-items: center;
  margin-bottom: clamp(3rem, 7vw, 4.5rem);
  padding: clamp(2.5rem, 5vw, 3.5rem);
  background: linear-gradient(135deg, var(--banner-start), var(--banner-end));
  color: #f2fbff;
  box-shadow: var(--shadow);
}

.hero img {
  width: 100%;
  box-shadow: 0 14px 28px rgba(8, 34, 70, 0.35);
  object-fit: cover;
  max-height: 22rem;
}

.hero h1 {
  font-size: clamp(2rem, 1.4rem + 2vw, 3rem);
  margin: 0 0 1rem;
  letter-spacing: 0.02em;
}

.hero .meta {
  display: grid;
  gap: 0.4rem;
  font-size: clamp(1rem, 0.95rem + 0.4vw, 1.2rem);
  color: rgba(226, 244, 255, 0.85);
  margin: 0 0 clamp(0.75rem, 2vw, 1.25rem);
}

.hero .meta span {
  display: block;
  text-align: left;
}

.hero .meta span::before {
  content: none;
}

.hero p {
  margin: 0 0 1rem;
}

main p {
  text-align: justify;
  text-align-last: left;
}

.section {
  margin-bottom: clamp(2.5rem, 6vw, 4rem);
}

.section h2 {
  margin: 0 0 1rem;
  font-size: clamp(1.4rem, 1.1rem + 1vw, 2rem);
}

.section p {
  margin: 0 0 1rem;
}

.grid-cards {
  display: grid;
  gap: clamp(1rem, 2vw, 2rem);
  grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr));
}

.info-grid {
  display: grid;
  gap: clamp(1rem, 2vw, 2rem);
  grid-template-columns: repeat(auto-fit, minmax(18rem, 1fr));
}

.card {
  background: var(--surface-color);
  border-radius: var(--radius);
  padding: clamp(1.25rem, 2.2vw, 1.75rem);
  box-shadow: var(--shadow);
  border: 1px solid rgba(12, 29, 43, 0.04);
}

.card h3 {
  margin-top: 0;
  margin-bottom: 0.75rem;
  font-size: clamp(1.1rem, 0.95rem + 0.5vw, 1.4rem);
}

.card p {
  margin: 0;
  color: var(--muted-color);
}

.plain-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.5rem;
  color: var(--muted-color);
}

.plain-list li {
  position: relative;
  padding-left: 1.25rem;
}

.plain-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55rem;
  width: 0.45rem;
  height: 0.45rem;
  border-radius: 50%;
  background: rgba(212, 76, 45, 0.5);
}

.timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(0.75rem, 1.5vw, 1.25rem);
}

.timeline li {
  border-left: 3px solid rgba(212, 76, 45, 0.3);
  padding-left: 1rem;
  color: var(--muted-color);
}

.timeline strong {
  display: block;
  color: var(--text-color);
  margin-bottom: 0.25rem;
}

.link-list {
  list-style: disc;
  margin: 0;
  padding-left: clamp(1.25rem, 3vw, 2.5rem);
  display: block;
}

.link-list li {
  margin-bottom: 0.6rem;
}

.link-list a {
  color: inherit;
}

.highlight {
  background: linear-gradient(120deg, rgba(17, 99, 196, 0.12), rgba(17, 162, 165, 0.05));
  border-left: 3px solid var(--accent-strong);
  padding: clamp(1rem, 2vw, 1.5rem);
}

.pub-section {
  background: var(--surface-color);
  padding: clamp(1.5rem, 2.5vw, 2.5rem);
  box-shadow: var(--shadow);
  border: 1px solid rgba(12, 29, 43, 0.05);
}

.pub-section h2 {
  margin-top: 0;
}

.pub-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(18rem, 1fr));
  gap: clamp(1.25rem, 2.5vw, 2rem);
}

.pub-list li {
  position: relative;
  padding-left: 1.25rem;
  color: var(--muted-color);
}

.pub-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.65rem;
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background: var(--accent-color);
}

.pub-list li strong {
  display: block;
  color: var(--text-color);
  margin-bottom: 0.35rem;
}

.pub-entries {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: clamp(1rem, 1.8vw, 1.75rem);
}

.pub-entries li {
  padding: clamp(1rem, 1.6vw, 1.5rem);
  border-left: 3px solid rgba(17, 99, 196, 0.35);
  background: rgba(248, 251, 255, 0.85);
  box-shadow: 0 12px 30px rgba(10, 31, 51, 0.08), 0 -12px 30px rgba(10, 31, 51, 0.05);
}

.pub-entries li span {
  display: block;
  color: var(--muted-color);
  margin-top: 0.5rem;
  font-size: 0.95rem;
  line-height: 1.5;
}

.pub-line {
  display: block;
  color: inherit;
}

.pub-line + .pub-line {
  margin-top: 0.35rem;
}

footer {
  background: linear-gradient(135deg, rgba(15, 61, 116, 0.92), rgba(17, 162, 165, 0.85));
  color: #e9f4ff;
  text-align: center;
  padding: clamp(2rem, 5vw, 3rem) clamp(1rem, 5vw, 2rem);
  font-size: 0.95rem;
}

@media (max-width: 768px) {
  .header-inner {
    flex-wrap: wrap;
    padding-bottom: 1rem;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    width: 100%;
    flex-direction: column;
    gap: 0.5rem;
    display: none;
    padding-top: 0.75rem;
  }

  .site-nav.is-open {
    display: flex;
  }

  .site-nav a::after {
    display: none;
  }

  .lang-toggle {
    align-self: flex-start;
  }

  .pub-list {
    grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}