/* =============================================
   COMPONENTS — nav / footer / shared bits
   ============================================= */

/* ---------- NAV ---------- */
.site-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 900;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 16px clamp(18px, 5vw, 56px);
  background: rgba(12, 21, 18, 0.72);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border2, #1B3025);
  transition: background .3s ease, border-color .3s ease;
}
body.theme-light .site-nav {
  background: rgba(247, 245, 239, 0.82);
  border-bottom-color: #E0DDD0;
}

.site-nav .brand {
  font-family: var(--font-display-en);
  font-size: 21px;
  letter-spacing: 0.16em;
  text-decoration: none;
  color: var(--text);
  white-space: nowrap;
}
.site-nav .brand .brand-mark {
  color: var(--brass);
  margin-right: 8px;
}

.nav-hamburger {
  display: none;
  width: 40px; height: 40px;
  background: none;
  border: 1px solid var(--border);
  border-radius: 6px;
  cursor: pointer;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
}
.nav-hamburger .hb-bar {
  display: block;
  width: 18px; height: 1px;
  background: var(--text2);
  transition: transform .25s ease, opacity .25s ease;
}
.nav-hamburger[aria-expanded="true"] .hb-bar:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-hamburger[aria-expanded="true"] .hb-bar:nth-child(2) { opacity: 0; }
.nav-hamburger[aria-expanded="true"] .hb-bar:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

.nav-links {
  display: flex;
  align-items: center;
  gap: clamp(16px, 2.4vw, 34px);
}
.nav-links a {
  font-family: var(--font-sans-jp);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--text3);
  text-decoration: none;
  padding: 6px 0;
  border-bottom: 1px solid transparent;
  transition: color .2s ease, border-color .2s ease;
  white-space: nowrap;
}
.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--brass);
  border-bottom-color: var(--brass);
}
.nav-links a.nav-cta {
  border: 1px solid var(--brass);
  border-radius: 999px;
  padding: 7px 20px;
  color: var(--brass);
}
.nav-links a.nav-cta:hover {
  background: var(--brass);
  color: #0C1512;
}

@media (max-width: 860px) {
  .nav-hamburger { display: flex; }
  .nav-links {
    position: absolute;
    top: 100%; left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px clamp(18px, 5vw, 56px) 22px;
    background: var(--bg2);
    border-bottom: 1px solid var(--border);
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    pointer-events: none;
    transition: max-height .3s ease, opacity .3s ease;
  }
  .nav-links.open {
    max-height: 460px;
    opacity: 1;
    pointer-events: auto;
  }
  .nav-links a {
    font-size: 15px;
    padding: 14px 0;
    border-bottom: 1px solid var(--border2);
  }
  .nav-links a.nav-cta {
    margin-top: 14px;
    text-align: center;
    border-bottom: 1px solid var(--brass);
  }
}

/* ---------- FOOTER ---------- */
.site-footer {
  background: var(--bg2);
  border-top: 1px solid var(--border);
  padding: clamp(48px, 7vw, 76px) clamp(18px, 5vw, 56px) 40px;
}
.footer-inner {
  max-width: var(--maxw);
  margin: 0 auto;
}
.footer-top {
  display: flex;
  flex-wrap: wrap;
  gap: 34px;
  justify-content: space-between;
  align-items: flex-start;
}
.footer-brand .f-name {
  font-family: var(--font-display-jp);
  font-size: 20px;
  letter-spacing: 0.12em;
  color: var(--text);
  display: block;
  margin-bottom: 8px;
}
.footer-brand .f-role {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--brass);
  text-transform: uppercase;
}
.footer-brand .f-mission {
  margin-top: 14px;
  font-size: 13.5px;
  line-height: 2;
  color: var(--text3);
  max-width: 34em;
}
.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  align-content: flex-start;
  max-width: 420px;
}
.footer-nav a {
  font-family: var(--font-sans-jp);
  font-size: 13px;
  color: var(--text3);
  text-decoration: none;
  transition: color .2s ease;
}
.footer-nav a:hover { color: var(--brass); }

.footer-copy {
  margin-top: 40px;
  padding-top: 22px;
  border-top: 1px solid var(--border2);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--text4);
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  justify-content: space-between;
}
.footer-copy .footer-rights {
  font-family: var(--font-body-jp);
  letter-spacing: 0.02em;
  max-width: 46em;
  line-height: 1.9;
}

/* ---------- SHARED PIECES ---------- */
.sec-en {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--brass);
  margin-bottom: 18px;
}
.rule {
  width: 44px;
  height: 1px;
  background: var(--brass);
  opacity: .7;
}
.btn {
  display: inline-block;
  font-family: var(--font-sans-jp);
  font-size: 13.5px;
  letter-spacing: 0.14em;
  text-decoration: none;
  color: var(--brass);
  border: 1px solid var(--brass);
  border-radius: 999px;
  padding: 14px 34px;
  transition: background .25s ease, color .25s ease;
}
.btn:hover { background: var(--brass); color: #0C1512; }