/* ==============================
   Reset & Base
============================== */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Noto Sans JP', sans-serif;
  font-weight: 400;
  font-size: 16px;
  line-height: 1.7;
  color: #1a1a1a;
  background-color: #fafaf8;
}

/* ==============================
   Typography
============================== */
.section-label {
  font-size: 11px;
  letter-spacing: 0.18em;
  color: #999;
  margin-bottom: 1.5rem;
}

/* ==============================
   Navigation
============================== */
.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem 3rem;
  border-bottom: 0.5px solid #ddd;
  background-color: #fafaf8;
  position: sticky;
  top: 0;
  z-index: 100;
}

.logo-jp {
  font-family: 'Noto Serif JP', serif;
  font-weight: 300;
  font-size: 13px;
  color: #333;
}

.logo-en {
  font-size: 10px;
  letter-spacing: 0.1em;
  color: #aaa;
  margin-top: 2px;
}

.nav-links {
  display: flex;
  gap: 2.5rem;
  list-style: none;
}

.nav-links a {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: #666;
  text-decoration: none;
  transition: color 0.2s;
}

.nav-links a:hover {
  color: #1a1a1a;
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 20px;
  color: #555;
  cursor: pointer;
}

/* ==============================
   Hero
============================== */
.hero {
  padding: 6rem 3rem 5rem;
  border-bottom: 0.5px solid #ddd;
  max-width: 860px;
}

.hero-title {
  font-family: 'Noto Serif JP', serif;
  font-weight: 300;
  font-size: 28px;
  line-height: 2;
  color: #1a1a1a;
  margin-bottom: 1.75rem;
}

.hero-sub {
  font-size: 13px;
  color: #666;
  line-height: 2.2;
  max-width: 520px;
}

/* ==============================
   Sections
============================== */
.section {
  padding: 4rem 3rem;
  border-bottom: 0.5px solid #ddd;
}

.section-title {
  font-family: 'Noto Serif JP', serif;
  font-weight: 300;
  font-size: 20px;
  color: #1a1a1a;
  margin-bottom: 2rem;
  line-height: 1.8;
}

.section-body {
  font-size: 13px;
  color: #666;
  line-height: 2.2;
}

/* ==============================
   Mission Grid
============================== */
.mission-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  border: 0.5px solid #ddd;
}

.mission-item {
  padding: 2rem;
  border: 0.5px solid #ddd;
}

.mission-num {
  display: block;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: #aaa;
  margin-bottom: 0.75rem;
}

.mission-ttl {
  font-size: 13px;
  font-weight: 500;
  color: #1a1a1a;
  margin-bottom: 0.75rem;
  line-height: 1.6;
}

.mission-txt {
  font-size: 12px;
  color: #777;
  line-height: 2;
}

/* ==============================
   Business List
============================== */
.biz-list {
  list-style: none;
  border-top: 0.5px solid #ddd;
}

.biz-list li {
  display: flex;
  gap: 2rem;
  align-items: baseline;
  padding: 1.1rem 0;
  border-bottom: 0.5px solid #ddd;
  font-size: 13px;
  color: #444;
}

.biz-tag {
  font-size: 11px;
  letter-spacing: 0.06em;
  color: #999;
  min-width: 80px;
  flex-shrink: 0;
}

.biz-body {
  line-height: 1.9;
}

/* ==============================
   Officers
============================== */
.officers {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  border: 0.5px solid #ddd;
  margin-bottom: 1.25rem;
}

.officer {
  padding: 1.5rem 2rem;
  border: 0.5px solid #ddd;
}

.officer-role {
  font-size: 11px;
  letter-spacing: 0.1em;
  color: #aaa;
  margin-bottom: 0.5rem;
}

.officer-name {
  font-family: 'Noto Serif JP', serif;
  font-weight: 300;
  font-size: 18px;
  color: #1a1a1a;
}

.officers-note {
  font-size: 12px;
  color: #999;
  line-height: 1.9;
}

/* ==============================
   Contact
============================== */
.contact-link {
  display: inline-block;
  margin-top: 1.25rem;
  font-size: 13px;
  color: #444;
  text-decoration: none;
  border-bottom: 0.5px solid #aaa;
  padding-bottom: 2px;
  letter-spacing: 0.04em;
  transition: color 0.2s, border-color 0.2s;
}

.contact-link:hover {
  color: #1a1a1a;
  border-color: #1a1a1a;
}

/* ==============================
   Footer
============================== */
.footer {
  padding: 2.5rem 3rem;
  background-color: #f2f0ec;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 1rem;
}

.footer-name {
  font-family: 'Noto Serif JP', serif;
  font-weight: 300;
  font-size: 13px;
  color: #555;
  margin-bottom: 0.4rem;
}

.footer-info {
  font-size: 11px;
  color: #999;
  line-height: 2;
}

.footer-copy {
  font-size: 11px;
  color: #bbb;
  white-space: nowrap;
}

/* ==============================
   Responsive
============================== */
@media (max-width: 768px) {
  .nav {
    padding: 1.25rem 1.5rem;
    flex-wrap: wrap;
    gap: 0.5rem;
  }

  .nav-links {
    display: none;
    flex-direction: column;
    gap: 1rem;
    width: 100%;
    padding: 1rem 0 0.5rem;
    border-top: 0.5px solid #ddd;
  }

  .nav-links.open {
    display: flex;
  }

  .nav-toggle {
    display: block;
  }

  .hero {
    padding: 3rem 1.5rem 2.5rem;
  }

  .hero-title {
    font-size: 20px;
  }

  .section {
    padding: 2.5rem 1.5rem;
  }

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

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

  .biz-list li {
    flex-direction: column;
    gap: 0.4rem;
  }

  .footer {
    padding: 2rem 1.5rem;
  }

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }
}