:root {
  --color-bg: #ffffff;
  --color-fg: #1a1a1a;
  --color-muted: #6b7280;
  --color-border: #e5e7eb;
  --color-accent: #1e3a8a;
  --color-accent-hover: #1e40af;
  --color-surface: #f8fafc;
  --max-width: 960px;
  --radius: 6px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Helvetica Neue", "Hiragino Sans",
    "Hiragino Kaku Gothic ProN", "Yu Gothic", "YuGothic", Meiryo, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--color-fg);
  background: var(--color-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  font-feature-settings: "palt";
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color 0.15s ease;
}

a:hover {
  color: var(--color-accent-hover);
  text-decoration: underline;
}

img {
  max-width: 100%;
  height: auto;
}

h1, h2, h3, h4 {
  line-height: 1.4;
  margin-top: 0;
}

/* Layout */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* Header */
.site-header {
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
  gap: 1rem;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--color-fg);
  letter-spacing: 0.02em;
}

.site-logo:hover {
  text-decoration: none;
  color: var(--color-accent);
}

.site-logo img {
  height: 38px;
  width: auto;
  display: block;
}

.site-logo .logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.site-logo small {
  font-size: 0.7rem;
  font-weight: 400;
  color: var(--color-muted);
  letter-spacing: 0.1em;
}

.site-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.site-nav a {
  color: var(--color-fg);
  font-size: 0.95rem;
}

.site-nav a:hover,
.site-nav a.active {
  color: var(--color-accent);
  text-decoration: none;
}

/* Hero */
.hero {
  background: linear-gradient(135deg, #1e3a8a 0%, #3b82f6 100%);
  color: #fff;
  padding: 5rem 0;
  text-align: center;
}

.hero h1 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  margin-bottom: 1rem;
  letter-spacing: 0.02em;
}

.hero p {
  font-size: 1.05rem;
  opacity: 0.92;
  max-width: 640px;
  margin: 0 auto;
}

/* Page header (non-top pages) */
.page-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: 3rem 0 2rem;
  text-align: center;
}

.page-header h1 {
  font-size: clamp(1.5rem, 3.5vw, 2rem);
  margin-bottom: 0.25rem;
}

.page-header .lead {
  color: var(--color-muted);
  margin: 0;
  font-size: 0.95rem;
  letter-spacing: 0.1em;
}

/* Sections */
.section {
  padding: 4rem 0;
}

.section + .section {
  border-top: 1px solid var(--color-border);
}

.section h2 {
  font-size: 1.5rem;
  margin-bottom: 1.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--color-accent);
  display: inline-block;
}

/* Cards / Grids */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.25rem;
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem;
}

.card h3 {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
  color: var(--color-accent);
}

.card p {
  margin: 0;
  color: var(--color-fg);
  font-size: 0.95rem;
}

/* Works list */
.work-list,
.partner-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.work-list li,
.partner-list li {
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--color-border);
}

.work-list li:last-child,
.partner-list li:last-child {
  border-bottom: none;
}

.work-list h3,
.partner-list h3 {
  font-size: 1.1rem;
  margin: 0 0 0.25rem;
}

.work-list .meta,
.partner-list .meta {
  color: var(--color-muted);
  font-size: 0.9rem;
  margin: 0.25rem 0;
}

/* News list */
.news-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.news-list li {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  padding: 0.875rem 0;
  border-bottom: 1px solid var(--color-border);
}

.news-list time {
  color: var(--color-muted);
  font-variant-numeric: tabular-nums;
  min-width: 6.5rem;
  font-size: 0.9rem;
}

/* Info table */
.info-table {
  width: 100%;
  border-collapse: collapse;
}

.info-table th,
.info-table td {
  text-align: left;
  vertical-align: top;
  padding: 1rem 1rem 1rem 0;
  border-bottom: 1px solid var(--color-border);
  font-weight: 400;
}

.info-table th {
  width: 9rem;
  color: var(--color-muted);
  font-weight: 500;
  white-space: nowrap;
}

@media (max-width: 540px) {
  .info-table,
  .info-table tbody,
  .info-table tr,
  .info-table th,
  .info-table td {
    display: block;
    width: 100%;
  }
  .info-table th {
    padding-bottom: 0;
    border-bottom: none;
    font-size: 0.85rem;
  }
  .info-table td {
    padding-top: 0.25rem;
  }
}

/* Contact */
.contact-box {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 2rem;
}

.contact-box dl {
  margin: 0;
  display: grid;
  grid-template-columns: 8rem 1fr;
  gap: 0.75rem 1rem;
}

.contact-box dt {
  color: var(--color-muted);
  font-size: 0.95rem;
}

.contact-box dd {
  margin: 0;
}

@media (max-width: 540px) {
  .contact-box dl {
    grid-template-columns: 1fr;
    gap: 0.25rem;
  }
  .contact-box dt {
    margin-top: 0.5rem;
  }
}

/* Footer */
.site-footer {
  background: #0f172a;
  color: #cbd5e1;
  padding: 2.5rem 0 1.5rem;
  margin-top: 4rem;
  font-size: 0.9rem;
}

.site-footer a {
  color: #93c5fd;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  margin-bottom: 1.5rem;
}

.footer-grid h4 {
  color: #fff;
  font-size: 0.95rem;
  margin: 0 0 0.5rem;
}

.footer-grid ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-grid li {
  margin-bottom: 0.25rem;
}

.copyright {
  text-align: center;
  color: #64748b;
  font-size: 0.85rem;
  border-top: 1px solid #1e293b;
  padding-top: 1rem;
}

@media (max-width: 640px) {
  .site-header .container {
    flex-direction: column;
    padding: 0.75rem 1.25rem;
  }
  .site-nav ul {
    gap: 1rem;
    justify-content: center;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .hero {
    padding: 3.5rem 0;
  }
  .section {
    padding: 3rem 0;
  }
}