/* ===== Section Head (shared layout utility) ===== */
.section-head {
  max-width: 720px;
  margin: 0 auto 72px;
  text-align: center;
  padding: 0 var(--rail);
}
.section-title {
  font-size: clamp(28px, 4vw, 44px);
  margin: 18px 0 16px;
  font-weight: 600;
  color: var(--ink);
}
.section-desc {
  color: var(--ink-mute);
  font-size: 15px;
  max-width: 560px;
  margin: 0 auto;
}

/* ===== Header ===== */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(250,250,246,0.85);
  backdrop-filter: blur(16px) saturate(1.1);
  border-bottom: 1px solid transparent;
  transition: background 0.3s, border-color 0.3s;
}
.site-header.scrolled {
  background: rgba(250,250,246,0.96);
  border-bottom-color: var(--line);
}
.header-inner {
  max-width: 1600px;
  margin: 0 auto;
  padding: 24px var(--rail) 16px;
  display: flex;
  align-items: center;
  gap: 32px;
}
.brand {
  flex-shrink: 0;
  white-space: nowrap;
}
/* ===== Page Back Bar (ヘッダー直下の戻るバー) ===== */
.page-back-bar {
  position: fixed;
  top: 82px;
  left: 0;
  right: 0;
  z-index: 99;
  background: rgba(250,250,246,0.92);
  backdrop-filter: blur(12px) saturate(1.1);
  border-bottom: 1px solid var(--line);
}
@media (max-width: 900px) {
  .page-back-bar { top: 62px; }
}
.page-back-inner {
  max-width: var(--container-wide);
  margin: 0 auto;
  padding: 8px var(--rail);
}
.back-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 8px 14px 8px 12px;
  font-family: var(--font-mincho);
  font-size: 14px;
  color: var(--ink-soft);
  text-decoration: none;
  cursor: pointer;
  transition: background 0.2s, color 0.2s, border-color 0.2s;
  white-space: nowrap;
  line-height: 1;
}
.back-btn:hover {
  background: var(--ink);
  color: var(--white);
  border-color: var(--ink);
}
.back-btn svg {
  flex-shrink: 0;
}
.brand {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
  padding-top: 3px;
  margin-left: -4px;
}
.brand-en {
  font-family: var(--font-serif-en);
  font-size: 11px;
  letter-spacing: 0.3em;
  color: var(--gold);
  font-weight: 500;
}
.brand-jp {
  font-family: var(--font-mincho);
  font-size: 22px;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: 0.12em;
  margin-top: 2px;
}
.nav {
  display: flex;
  gap: 0;
  flex: 1;
  margin-left: 40px;
  justify-content: space-evenly;
  align-items: center;
}
.nav a {
  font-size: 14px;
  font-weight: 500;
  color: var(--ink-soft);
  position: relative;
  padding: 4px 0;
  transition: color 0.3s;
  white-space: nowrap;
}
.nav a::after {
  content: "";
  position: absolute;
  bottom: 0; left: 0;
  width: 100%; height: 1px;
  background: var(--gold);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.4s cubic-bezier(.5,.2,.2,1);
}
.nav a:hover { color: var(--ink); }
.nav a:hover::after { transform: scaleX(1); transform-origin: left; }

/* Mobile nav panel の中の tel — デスクトップでは非表示 */
.nav .nav-tel { display: none; }

.header-tel {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  border-left: 1px solid var(--line);
  padding-left: 20px;
  line-height: 1.2;
  flex-shrink: 0;
  white-space: nowrap;
}
.tel-label {
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--ink-mute);
  white-space: nowrap;
}
.tel-num {
  font-family: var(--font-serif-en);
  font-size: 22px;
  font-weight: 600;
  color: var(--sea);
  letter-spacing: 0.04em;
  margin-top: 2px;
  white-space: nowrap;
}

/* ===== Hamburger toggle (mobile only) ===== */
.nav-toggle {
  display: none;
  background: transparent;
  border: none;
  padding: 10px;
  cursor: pointer;
  position: relative;
  width: 44px;
  height: 44px;
  margin-left: 8px;
}
.nav-toggle-bar {
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--ink);
  margin: 5px auto;
  transition: transform 0.3s, opacity 0.2s;
  border-radius: 1px;
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) {
  opacity: 0;
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

/* ===== Mobile nav breakpoint ===== */
@media (max-width: 900px) {
  .header-inner {
    gap: 16px;
    padding: 14px var(--rail) 10px;
  }
  .brand-jp { font-size: 19px; }
  .brand-en { font-size: 10px; letter-spacing: 0.25em; }

  .header-tel { display: none; }
  .nav-toggle { display: block; margin-left: auto; }

  .nav {
    position: fixed;
    top: 0;
    right: 0;
    width: min(340px, 82vw);
    height: 100vh;
    padding: 96px 32px 40px;
    background: var(--paper);
    border-left: 1px solid var(--line);
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    transform: translateX(100%);
    transition: transform 0.35s cubic-bezier(.4,.6,.2,1);
    overflow-y: auto;
    box-shadow: -6px 0 32px rgba(0, 0, 0, 0.08);
    z-index: 99;
  }
  .nav.is-open {
    transform: translateX(0);
  }
  .nav a {
    display: block;
    width: 100%;
    padding: 18px 0;
    font-size: 16px;
    color: var(--ink);
    border-bottom: 1px solid var(--line);
    letter-spacing: 0.04em;
  }
  .nav a::after { display: none; }
  .nav a:hover { color: var(--gold); }

  .nav .nav-tel {
    display: flex;
    flex-direction: column;
    margin-top: 32px;
    padding: 20px 24px;
    background: var(--paper-warm);
    border: 1px solid var(--line);
    border-radius: 2px;
    width: 100%;
    align-items: flex-start;
  }
  .nav .nav-tel-label {
    font-size: 10px;
    letter-spacing: 0.2em;
    color: var(--ink-mute);
    font-family: var(--font-serif-en);
    text-transform: uppercase;
  }
  .nav .nav-tel-num {
    font-family: var(--font-serif-en);
    font-size: 26px;
    font-weight: 600;
    color: var(--sea);
    letter-spacing: 0.04em;
    margin-top: 4px;
  }

  body.nav-open {
    overflow: hidden;
  }
  body.nav-open::before {
    content: "";
    position: fixed;
    inset: 0;
    background: rgba(15, 20, 28, 0.42);
    z-index: 98;
    backdrop-filter: blur(2px);
  }
}

/* ===== Footer ===== */
.site-footer {
  background: var(--sea-deep);
  color: rgba(255,255,255,0.7);
  padding: 100px var(--rail) 0;
}
.footer-inner {
  max-width: var(--container-wide);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 2.5fr;
  gap: 80px;
  padding-bottom: 80px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}
.footer-brand {
  display: flex;
  flex-direction: column;
}
.footer-brand .brand-jp { color: var(--white); }
.footer-est {
  font-family: var(--font-serif-en);
  font-size: 11px;
  letter-spacing: 0.3em;
  color: var(--gold-soft);
  margin-top: 20px;
  font-style: italic;
}
.footer-nav {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 40px;
}
.footer-nav h5 {
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--gold-soft);
  margin-bottom: 20px;
  font-family: var(--font-serif-en);
  font-style: italic;
  text-transform: uppercase;
  font-weight: 500;
}
.footer-nav a {
  display: block;
  font-size: 13.5px;
  padding: 6px 0;
  color: rgba(255,255,255,0.65);
  transition: color 0.3s;
}
.footer-nav a:hover { color: var(--gold-soft); }

/* CONTACT列: 情報ブロック + CTA */
.footer-col--contact .footer-tel {
  font-family: var(--font-serif-en);
  font-size: 22px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--white);
  padding: 2px 0 10px;
  display: block;
}
.footer-col--contact .footer-tel:hover { color: var(--gold-soft); }
.footer-col--contact .footer-info {
  font-size: 12.5px;
  line-height: 1.8;
  color: rgba(255,255,255,0.55);
  margin: 0 0 14px;
  padding: 0;
}
.footer-col--contact .footer-hours {
  font-variant-numeric: tabular-nums;
}
.footer-col--contact .footer-inline-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12.5px;
  color: var(--gold-soft);
  padding: 6px 0;
  border-bottom: 1px solid rgba(255,255,255,0.15);
  text-decoration: none;
  transition: border-color 0.3s, color 0.3s;
}
.footer-col--contact .footer-inline-link:hover {
  color: var(--white);
  border-bottom-color: var(--gold-soft);
}
.footer-col--contact .footer-inline-link span { transition: transform 0.3s; }
.footer-col--contact .footer-inline-link:hover span { transform: translateX(3px); }
.footer-bottom {
  max-width: var(--container-wide);
  margin: 0 auto;
  padding: 32px 0;
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  color: rgba(255,255,255,0.4);
  letter-spacing: 0.06em;
}
.footer-cred { font-family: var(--font-serif-en); font-style: italic; }

/* ===== Reveal animations ===== */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 1s cubic-bezier(.25,.8,.3,1), transform 1s cubic-bezier(.25,.8,.3,1);
}
.reveal.in {
  opacity: 1;
  transform: translateY(0);
}

/* ===== Responsive ===== */
@media (min-width: 901px) and (max-width: 1024px) {
  .nav { gap: 0; margin-left: 24px; }
}
@media (max-width: 1024px) {
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .feature:nth-child(2) { border-right: none; }
  .feature:nth-child(1), .feature:nth-child(2) { border-bottom: 1px solid var(--line); }
  .specialty-inner { grid-template-columns: 1fr; gap: 48px; }
  .service-grid { grid-template-columns: repeat(2, 1fr); }
  .service-card-main { grid-column: span 2; }
  .flow-steps { grid-template-columns: repeat(2, 1fr); gap: 40px 16px; }
  .flow-steps::before { display: none; }
  .doctor-inner { grid-template-columns: 1fr; gap: 48px; }
  .doctor-mark { order: -1; max-width: 200px; margin: 0 auto; }
  .doctor::before { display: none; }
  .case-grid { grid-template-columns: 1fr; }
  .access-inner { grid-template-columns: 1fr; gap: 48px; }
  .footer-inner { grid-template-columns: 1fr; gap: 48px; }
  .footer-nav { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
  .header-inner { gap: 16px; }
  .tel-label { display: none; }
  .tel-num { font-size: 18px; }
  .hero { padding-top: 100px; }
  .hero-cta { flex-direction: column; align-items: stretch; }
  .hero-cta .btn { justify-content: center; }
  .feature-grid { grid-template-columns: 1fr; }
  .feature { border-right: none !important; border-bottom: 1px solid var(--line); }
  .feature:last-child { border-bottom: none; }
  .service-grid { grid-template-columns: 1fr; }
  .service-card-main { grid-column: span 1; }
  .service-card-main h3 { font-size: 26px; }
  .flow-steps { grid-template-columns: 1fr; }
  .footer-nav { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }
  .specialty-banner { padding: 80px var(--rail); }
  .features, .services, .flow, .doctor, .cases, .access { padding: 80px var(--rail); }
  .section-head { margin-bottom: 48px; }
}