*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { font-family: 'Noto Sans JP', sans-serif; color: #1E293B; background: #fff; line-height: 1.8; }
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }

:root {
  --accent: #0D9488;
  --accent-mid: #0F766E;
  --accent-light: #F0FDFA;
  --dark: #0F172A;
  --text: #1E293B;
  --mid: #475569;
  --gray: #94A3B8;
  --border: #E2E8F0;
  --bg: #F8FAFC;
  --white: #fff;
  --radius: 8px;
  --t: 0.25s ease;
}

.container { max-width: 1100px; margin: 0 auto; padding: 0 40px; }
@media (max-width: 768px) { .container { padding: 0 20px; } }

/* Label */
.label {
  display: inline-block;
  font-family: 'Montserrat', sans-serif;
  font-size: 0.72rem; font-weight: 600;
  letter-spacing: 0.22em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 12px;
}

/* Heading */
.heading {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 700; color: var(--dark); margin-bottom: 48px; line-height: 1.35;
}
.serif { font-family: 'Noto Serif JP', serif; }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 13px 30px; border-radius: var(--radius);
  font-size: 0.92rem; font-weight: 500; letter-spacing: 0.03em;
  transition: all var(--t); cursor: pointer; border: none;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-mid); transform: translateY(-2px); }
.btn-outline { background: transparent; color: var(--accent); border: 1.5px solid var(--accent); }
.btn-outline:hover { background: var(--accent-light); }
.btn-ghost { background: transparent; color: #fff; border: 1.5px solid rgba(255,255,255,0.4); }
.btn-ghost:hover { background: rgba(255,255,255,0.1); }

/* Fade in */
.fade-in { opacity: 0; transform: translateY(18px); transition: opacity 0.6s ease, transform 0.6s ease; }
.fade-in.visible { opacity: 1; transform: translateY(0); }

/* Navigation */
.site-nav {
  position: fixed; top: 0; left: 0; right: 0;
  background: #fff; border-bottom: 1px solid var(--border);
  z-index: 100; transition: box-shadow var(--t);
}
.nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 40px; max-width: 1200px; margin: 0 auto;
}
.nav-logo {
  font-family: 'Montserrat', sans-serif; font-weight: 700;
  font-size: 1.3rem; color: var(--dark); letter-spacing: 0.08em; line-height: 1;
}
.nav-logo small {
  display: block; font-size: 0.58rem; font-weight: 300;
  color: var(--gray); letter-spacing: 0.2em; margin-top: 3px;
}
.nav-links { display: flex; gap: 32px; list-style: none; }
.nav-links a {
  font-family: 'Montserrat', sans-serif; font-size: 0.84rem;
  color: var(--mid); letter-spacing: 0.04em; transition: color var(--t);
}
.nav-links a:hover { color: var(--accent); }
.nav-cta {
  background: var(--accent) !important; color: #fff !important;
  padding: 9px 22px; border-radius: var(--radius);
  font-size: 0.82rem !important; font-weight: 500;
}
.nav-cta:hover { background: var(--accent-mid) !important; }
.nav-toggle {
  display: none; flex-direction: column; gap: 5px;
  cursor: pointer; background: none; border: none; padding: 4px;
}
.nav-toggle span { display: block; width: 22px; height: 2px; background: var(--dark); border-radius: 2px; transition: all 0.3s; }

/* Page header (inner pages) */
.page-header {
  background: var(--dark); padding: 130px 40px 72px; text-align: center;
}
.page-header .label { color: #93C5FD; }
.page-header h1 {
  font-family: 'Noto Serif JP', serif;
  font-size: clamp(2rem, 5vw, 3.2rem); font-weight: 700; color: #fff;
}

/* Footer */
.site-footer { background: var(--dark); padding: 48px 40px 28px; }
.footer-inner {
  max-width: 1200px; margin: 0 auto;
  display: flex; justify-content: space-between; align-items: center;
  padding-bottom: 28px; border-bottom: 1px solid rgba(255,255,255,0.08); margin-bottom: 20px;
}
.footer-logo {
  font-family: 'Montserrat', sans-serif; font-weight: 700;
  font-size: 1.1rem; color: #fff;
}
.footer-logo small { display: block; font-size: 0.65rem; font-weight: 300; color: rgba(255,255,255,0.35); letter-spacing: 0.18em; margin-top: 4px; }
.footer-nav { display: flex; gap: 24px; list-style: none; }
.footer-nav a { font-size: 0.82rem; color: rgba(255,255,255,0.45); transition: color var(--t); }
.footer-nav a:hover { color: #fff; }
.footer-copy { text-align: center; font-size: 0.76rem; color: rgba(255,255,255,0.25); }

@media (max-width: 768px) {
  .nav-inner { padding: 14px 20px; }
  .nav-links { display: none; }
  .nav-toggle { display: flex; }
  .nav-links.open {
    display: flex; flex-direction: column; gap: 12px;
    position: absolute; top: 100%; left: 0; right: 0;
    background: #fff; padding: 16px 20px 24px;
    border-bottom: 1px solid var(--border); box-shadow: 0 8px 20px rgba(0,0,0,0.08);
  }
  .nav-cta { display: inline-flex; justify-content: center; width: fit-content; }
  .footer-inner { flex-direction: column; gap: 20px; text-align: center; }
  .footer-nav { flex-wrap: wrap; justify-content: center; }
  .page-header { padding: 110px 20px 56px; }
}