:root {
  color-scheme: light;
  --bg: #f4f7fb;
  --surface: #ffffff;
  --text: #1f2937;
  --muted: #64748b;
  --border: rgba(15, 23, 42, 0.12);
  --accent: #2563eb;
  --accent-strong: #1d4ed8;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Segoe UI", "Hiragino Sans", "Yu Gothic UI", Meiryo, sans-serif;
  line-height: 1.7;
  color: var(--text);
  background: linear-gradient(135deg, #f8fbff 0%, #eef4ff 100%);
}

img {
  display: block;
  width: 100%;
  height: auto;
}

.page {
  max-width: 960px;
  margin: 0 auto;
  padding: clamp(1rem, 3vw, 2rem);
}

.hero,
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 24px;
  box-shadow: 0 16px 40px rgba(15, 23, 42, 0.08);
}

.hero {
  padding: clamp(1.4rem, 3vw, 2.4rem);
  margin-bottom: 1.25rem;
}

h1 {
  margin: 0 0 0.75rem;
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  line-height: 1.2;
}

.lead {
  margin: 0;
  max-width: 100%;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.7;
}

.card {
  padding: clamp(1.1rem, 3vw, 1.6rem);
}

.card > p {
  margin: 0 0 1rem;
}

.gallery {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin: 1.25rem 0 1.5rem;
}

figure {
  margin: 0;
  padding: 0.7rem;
  background: #f8fafc;
  border: 1px solid rgba(15, 23, 42, 0.06);
  border-radius: 16px;
}

.image-trigger {
  display: block;
  width: 100%;
  padding: 0;
  border: 0;
  background: transparent;
  cursor: zoom-in;
}

.image-trigger img {
  display: block;
  width: 100%;
  height: 220px;
  object-fit: contain;
  border-radius: 12px;
  background: #f8fafc;
}

body.lightbox-open {
  overflow: hidden;
}

.lightbox {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: grid;
  place-items: center;
  padding: 1rem;
  background: rgba(2, 6, 23, 0.85);
}

.lightbox[hidden] {
  display: none;
}

.lightbox img {
  max-width: min(96vw, 1400px);
  max-height: min(92vh, 1200px);
  width: auto;
  height: auto;
  object-fit: contain;
  border-radius: 16px;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.35);
}

.lightbox-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  border: 0;
  border-radius: 999px;
  width: 44px;
  height: 44px;
  font-size: 1.5rem;
  color: white;
  background: rgba(255, 255, 255, 0.2);
  cursor: pointer;
}

.section-title {
  margin: 0 0 0.5rem;
  font-size: 1.2rem;
  border-bottom: 1px solid rgba(37, 99, 235, 0.2);
  padding-bottom: 0.35rem;
}

.content,
.references {
  margin-top: 1.25rem;
}

.page-footer {
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid rgba(15, 23, 42, 0.08);
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.7rem 0.95rem;
  border-radius: 999px;
  background: #f8fafc;
  border: 1px solid var(--border);
  color: var(--accent);
  font-weight: 600;
  text-decoration: none;
}

.back-link:hover,
.back-link:focus-visible {
  background: #eef4ff;
  text-decoration: none;
}

pre {
  margin: 1rem 0 0;
  padding: 1rem 1.1rem;
  overflow-x: auto;
  background: #0f172a;
  color: #e2e8f0;
  border-radius: 16px;
}

.table-wrapper {
  margin: 1rem 0 0;
  overflow-x: auto;
}

table {
  width: 100%;
  min-width: 420px;
  border-collapse: collapse;
  background: var(--surface);
  border: 1px solid var(--border);
}

table th,
table td {
  padding: 0.8rem 0.9rem;
  border-bottom: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
  font-size: 0.9rem;
}

table th {
  background: #f8fafc;
  color: var(--text);
  font-weight: 700;
}

table tr:last-child td {
  border-bottom: 0;
}

code {
  font-family: "Consolas", "Courier New", monospace;
  font-size: 0.95rem;
  white-space: pre;
}

.link-row {
  margin-top: 1rem;
}

a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
}

a:hover,
a:focus-visible {
  color: var(--accent-strong);
  text-decoration: underline;
}

@media (max-width: 700px) {
  .gallery {
    grid-template-columns: 1fr;
  }

  .page {
    padding: 1rem;
  }

  .image-trigger img {
    height: 200px;
  }
}

@media (max-width: 480px) {
  .hero,
  .card {
    border-radius: 18px;
  }

  .hero {
    padding: 1.2rem;
  }

  .card {
    padding: 1rem;
  }
}

/* Legacy top page content */
.legacy-page {
  overflow-wrap: anywhere;
}

.legacy-page h1,
.legacy-page h2,
.legacy-page h3 {
  margin-top: 1.2rem;
}

.legacy-page h1 {
  margin-top: 0;
  margin-bottom: 0.8rem;
}

.legacy-page h2 {
  font-size: clamp(1.1rem, 2.2vw, 1.35rem);
  line-height: 1.35;
  border-bottom: 1px solid rgba(37, 99, 235, 0.2);
  padding-bottom: 0.35rem;
}

.legacy-page h3 {
  font-size: clamp(1rem, 1.9vw, 1.15rem);
  color: #334155;
}

.legacy-page p,
.legacy-page li {
  line-height: 1.75;
}

.legacy-page ul,
.legacy-page ol {
  margin: 0.5rem 0 1rem 1.2rem;
  padding-left: 0.6rem;
}

.legacy-page li {
  margin: 0.2rem 0;
}

.legacy-page a {
  word-break: break-word;
}

@media (max-width: 700px) {
  .legacy-page {
    padding: 1rem;
  }

  .legacy-page ul,
  .legacy-page ol {
    margin-left: 0.7rem;
    padding-left: 0.8rem;
  }
}