.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border-soft);
  transition: box-shadow 0.25s, padding 0.25s, background 0.25s;
}

.site-header::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(158, 137, 61, 0.45) 20%,
    rgba(158, 137, 61, 0.45) 80%,
    transparent 100%
  );
  opacity: 0;
  transition: opacity 0.25s;
  pointer-events: none;
}

.site-header.is-scrolled {
  box-shadow: 0 4px 18px rgba(33, 56, 79, 0.07);
  background: rgba(255, 255, 255, 0.97);
}

.site-header.is-scrolled::after {
  opacity: 1;
}

.site-header.is-scrolled .header-inner {
  padding-block: 0.55rem;
}

.site-header.is-scrolled .logo-img {
  height: 1.5rem;
}

.site-header.is-scrolled .header-cta-secondary {
  display: none;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-block: 1rem;
}

.logo-link {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
  flex-shrink: 0;
}

.logo-img {
  height: 2rem;
  width: auto;
  transition: height 0.25s;
}

.nav-desktop {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  font-size: 0.875rem;
}

.nav-desktop > a,
.nav-item > a {
  text-decoration: none;
  color: var(--color-text-body);
  letter-spacing: 0.03em;
}

.nav-desktop > a:hover,
.nav-item > a:hover {
  color: var(--color-link-hover);
}

.nav-item {
  position: relative;
}

.nav-dropdown {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 14rem;
  max-height: 16rem;
  overflow-y: auto;
  background: var(--color-surface-card);
  border: 1px solid var(--color-border-soft);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-soft);
  padding: 0.5rem;
  z-index: 20;
}

.nav-item:hover .nav-dropdown,
.nav-item:focus-within .nav-dropdown {
  display: block;
}

.nav-dropdown a {
  display: block;
  padding: 0.45rem 0.6rem;
  text-decoration: none;
  font-size: 0.8125rem;
  color: var(--color-text-body);
  border-radius: 0.25rem;
}

.nav-dropdown a:hover {
  background: var(--color-surface-warm);
  color: var(--color-link-hover);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.lang-switch {
  font-size: 0.8125rem;
  color: var(--color-disabled-text);
  text-decoration: none;
  margin-left: 0.25rem;
  letter-spacing: 0.06em;
}

.menu-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  width: 2.5rem;
  height: 2.5rem;
  font-size: 1.25rem;
  cursor: pointer;
  color: var(--color-text-heading);
}

.drawer {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 60;
}

.drawer.is-open {
  display: block;
}

.drawer-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(33, 56, 79, 0.45);
}

.drawer-panel {
  position: absolute;
  top: 0;
  right: 0;
  width: min(20rem, 88vw);
  height: 100%;
  background: var(--color-surface-main);
  background-image: var(--paper-noise, var(--texture-washi));
  padding: 1.25rem;
  overflow-y: auto;
  box-shadow: -4px 0 24px rgba(33, 56, 79, 0.14);
}

.drawer-close {
  float: right;
  background: transparent;
  border: 0;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--color-text-heading);
}

.drawer-nav {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-top: 2rem;
  clear: both;
}

.drawer-nav a {
  text-decoration: none;
  color: var(--color-text-heading);
}

.drawer-nav a.btn-primary {
  color: var(--color-button-primary-text);
}

.drawer-nav a.btn-secondary {
  color: var(--color-brand-navy);
}

.drawer-sub {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding-left: 0.75rem;
  font-size: 0.875rem;
}

.site-footer {
  background:
    linear-gradient(180deg, rgba(23, 43, 61, 0.5) 0%, transparent 28%),
    var(--color-dark-surface);
  color: var(--color-dark-text-muted);
  padding: 3.25rem 0 2rem;
  margin-top: 0;
  position: relative;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(
    90deg,
    transparent 5%,
    rgba(158, 137, 61, 0.55) 30%,
    rgba(158, 137, 61, 0.85) 50%,
    rgba(158, 137, 61, 0.55) 70%,
    transparent 95%
  );
}

.site-footer a {
  color: var(--color-dark-text-muted);
  text-decoration: none;
}

.site-footer a:hover {
  color: var(--color-dark-text);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 0.8fr;
  gap: 2rem;
  margin-bottom: 2rem;
}

@media (max-width: 900px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 560px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }
}

.footer-title {
  color: var(--color-dark-text);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  margin-bottom: 0.85rem;
  padding-bottom: 0.45rem;
  border-bottom: 1px solid rgba(158, 137, 61, 0.35);
  display: inline-block;
  min-width: 4rem;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  font-size: 0.875rem;
}

.footer-copy {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding-top: 1.25rem;
  font-size: 0.75rem;
  letter-spacing: 0.04em;
}

.cookie-banner {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 70;
  background: #172b3d;
  color: #fff;
  padding: 0.85rem 1rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8125rem;
  border-top: 1px solid rgba(158, 137, 61, 0.4);
}

.cookie-banner[hidden] {
  display: none !important;
}

.cookie-banner a {
  color: #d1d5db;
}

/* —— Hero: 和の間 × 輪ネットワーク —— */
.hero {
  position: relative;
  padding: clamp(3.5rem, 7vw, 5.5rem) 0 clamp(3.25rem, 6vw, 4.75rem);
  overflow: hidden;
  background-color: var(--color-surface-main);
  background-image:
    radial-gradient(ellipse 55% 70% at 88% 18%, rgba(158, 137, 61, 0.1), transparent 58%),
    radial-gradient(ellipse 45% 55% at 8% 88%, rgba(33, 56, 79, 0.07), transparent 55%),
    linear-gradient(165deg, #faf8f4 0%, #f5f1e8 42%, #eef2f6 100%),
    var(--texture-washi);
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(33, 56, 79, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(33, 56, 79, 0.035) 1px, transparent 1px);
  background-size: 28px 28px;
  mask-image: radial-gradient(ellipse 80% 70% at 70% 40%, #000 20%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 80% 70% at 70% 40%, #000 20%, transparent 75%);
  pointer-events: none;
  opacity: 0.9;
}

.hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 2.25rem;
  align-items: center;
}

.hero h1 {
  max-width: 20em;
  text-wrap: balance;
}

@media (max-width: 900px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }
}

.hero .eyebrow {
  color: var(--color-brand-navy);
  opacity: 0.7;
}

.hero-visual {
  position: relative;
  min-height: 260px;
  border-radius: var(--radius-lg);
  background:
    radial-gradient(circle at 32% 42%, rgba(33, 56, 79, 0.08), transparent 48%),
    radial-gradient(circle at 68% 58%, rgba(158, 137, 61, 0.12), transparent 42%),
    var(--color-surface-card);
  border: 1px solid var(--color-border-soft);
  box-shadow: var(--shadow-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.hero-visual::before,
.hero-visual::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  border: 1px solid rgba(33, 56, 79, 0.18);
  pointer-events: none;
}

.hero-visual::before {
  width: min(78%, 240px);
  aspect-ratio: 1;
  top: 50%;
  left: 46%;
  transform: translate(-50%, -50%);
}

.hero-visual::after {
  width: min(48%, 148px);
  aspect-ratio: 1;
  top: 42%;
  left: 58%;
  transform: translate(-50%, -50%);
  border-color: rgba(158, 137, 61, 0.45);
}

.hero-visual canvas.hero-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  pointer-events: none;
}

.hero-visual img {
  position: relative;
  z-index: 2;
  max-height: 112px;
  opacity: 0.95;
  filter: drop-shadow(0 4px 12px rgba(33, 56, 79, 0.08));
}

@media (max-width: 1023px) {
  .nav-desktop,
  .header-actions .header-cta-secondary {
    display: none;
  }

  .menu-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .header-actions .btn-primary {
    padding: 0.5rem 0.85rem;
    font-size: 0.8rem;
  }
}

@media (max-width: 640px) {
  .header-actions .btn-primary {
    display: none;
  }

  .hero-visual {
    min-height: 200px;
  }
}

.main {
  min-height: 50vh;
}

/* --------------------------------------------------------------------------
 * デザイン案E「金継ぎ」— レイアウト
 * ----------------------------------------------------------------------- */
.site-header {
  position: relative;
  top: auto;
  background: var(--color-ink-deep);
  border-bottom-color: rgba(242, 241, 236, 0.1);
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
}

.site-header::after {
  opacity: 1;
  background: linear-gradient(90deg, transparent, rgba(158, 137, 61, 0.55), transparent);
}

.site-header.is-scrolled {
  background: rgba(5, 12, 23, 0.97);
  box-shadow: 0 4px 20px rgba(5, 12, 23, 0.2);
}

.header-inner {
  min-height: 4.75rem;
  padding-block: 0.8rem;
}

.logo-img {
  /* 白抜きのSVGを使うので反転は掛けない。掛けると金の点まで白に潰れる */
  opacity: 0.96;
}

.nav-desktop > a,
.nav-item > a,
.lang-switch {
  color: var(--color-on-ink-muted);
}

.nav-desktop > a:hover,
.nav-item > a:hover,
.lang-switch:hover {
  color: var(--color-gold-lit);
}

.site-header .btn-primary {
  background: var(--color-brand-gold);
  border-color: var(--color-brand-gold);
  color: var(--color-on-gold);
}

.site-header .btn-primary:hover {
  background: var(--color-gold-lit);
  border-color: var(--color-gold-lit);
  color: var(--color-ink-deep);
}

.site-header .btn-secondary {
  border-color: rgba(242, 241, 236, 0.5);
  color: var(--color-on-ink);
}

.site-header .btn-secondary:hover {
  border-color: var(--color-gold-lit);
  color: var(--color-gold-lit);
  background: transparent;
}

.site-header :is(a, button):focus-visible,
.page-hero a:focus-visible,
.cta-block :is(a, button):focus-visible {
  outline-color: var(--color-gold-lit);
}

.menu-toggle {
  border-color: rgba(242, 241, 236, 0.5);
  color: var(--color-on-ink);
}

.page-home .site-header {
  position: absolute;
  inset: 0 0 auto;
  z-index: 50;
  background: transparent;
  border-bottom-color: transparent;
}

.page-home .site-header::after {
  opacity: 0;
}

/* 透明ヘッダー上でもナビゲーションが背景画像に埋もれないようにする */
.page-home .nav-desktop > a,
.page-home .nav-item > a,
.page-home .lang-switch {
  color: var(--color-dark-text);
}

.page-home .nav-desktop > a:hover,
.page-home .nav-item > a:hover,
.page-home .lang-switch:hover {
  color: var(--color-gold-lit);
}

.page-home .menu-toggle,
.page-home .site-header .btn-secondary {
  border-color: var(--color-dark-text-muted);
  color: var(--color-dark-text);
}

.page-home .site-header .btn-secondary:hover {
  border-color: var(--color-gold-lit);
  color: var(--color-gold-lit);
}

.hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  min-height: min(92svh, 55rem);
  display: flex;
  align-items: center;
  background: var(--color-ink-deep);
  color: var(--color-dark-text);
  padding: 0;
}

.hero > picture,
.hero-kintsugi-img,
.hero-kintsugi-glow {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.hero-kintsugi-img,
.hero-kintsugi-glow {
  object-fit: cover;
  object-position: 48% 50%;
  transform: scale(1.06) translate3d(3%, 0, 0);
  animation: hero-drift 28s ease-in-out infinite alternate;
  will-change: transform;
}

/* 金糸だけを拾う細い光帯。異なる周期の揺らぎを重ね、規則的な点滅を避ける */
.hero-gold-glow {
  pointer-events: none;
  mix-blend-mode: screen;
  opacity: 0.12;
  -webkit-mask-image: linear-gradient(112deg, transparent 26%, rgba(0, 0, 0, 0.18) 40%, #000 49%, rgba(0, 0, 0, 0.18) 58%, transparent 72%);
  mask-image: linear-gradient(112deg, transparent 26%, rgba(0, 0, 0, 0.18) 40%, #000 49%, rgba(0, 0, 0, 0.18) 58%, transparent 72%);
  -webkit-mask-repeat: no-repeat;
  mask-repeat: no-repeat;
  -webkit-mask-size: 260% 100%;
  mask-size: 260% 100%;
  animation:
    hero-gold-flow 13s linear infinite,
    hero-gold-envelope 19s ease-in-out infinite;
}

.hero-kintsugi-glow {
  filter: brightness(1.55) saturate(1.24);
  animation:
    hero-drift 28s ease-in-out infinite alternate,
    hero-gold-shimmer 6.2s ease-in-out infinite;
}

/* ヒーローがゆっくり寄る。意味のある動きに限り、量は最小にとどめる */
@keyframes hero-drift {
  from { transform: scale(1.06) translate3d(3%, 0, 0); }
  to   { transform: scale(1.12) translate3d(1.8%, -0.8%, 0); }
}

@keyframes hero-gold-flow {
  from {
    -webkit-mask-position: 180% 0;
    mask-position: 180% 0;
  }
  to {
    -webkit-mask-position: -120% 0;
    mask-position: -120% 0;
  }
}

/* 低周波の包絡と短い揺らぎを掛け合わせた、1/fゆらぎを思わせる明滅 */
@keyframes hero-gold-envelope {
  0%   { opacity: 0.08; }
  11%  { opacity: 0.14; }
  24%  { opacity: 0.10; }
  38%  { opacity: 0.19; }
  52%  { opacity: 0.12; }
  69%  { opacity: 0.17; }
  83%  { opacity: 0.09; }
  100% { opacity: 0.14; }
}

@keyframes hero-gold-shimmer {
  0%   { filter: brightness(1.42) saturate(1.16); }
  17%  { filter: brightness(1.70) saturate(1.28); }
  33%  { filter: brightness(1.50) saturate(1.20); }
  58%  { filter: brightness(1.78) saturate(1.30); }
  76%  { filter: brightness(1.47) saturate(1.18); }
  100% { filter: brightness(1.62) saturate(1.25); }
}

@media (prefers-reduced-motion: reduce) {
  .hero-kintsugi-img {
    animation: none;
    transform: scale(1.06) translate3d(3%, 0, 0);
  }

  .hero-gold-glow {
    display: none;
  }
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(100deg, rgba(5, 12, 23, 0.95) 0%, rgba(5, 12, 23, 0.8) 34%, rgba(5, 12, 23, 0.2) 64%, rgba(5, 12, 23, 0.42) 100%);
}

.hero-grid {
  position: relative;
  z-index: 2;
  display: block;
  padding-block: 8rem 5.5rem;
}

.hero-copy {
  max-width: 48rem;
}

.hero .eyebrow {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  color: var(--color-gold-lit);
  opacity: 1;
}

.hero .eyebrow::after {
  content: "";
  width: 10rem;
  max-width: 30vw;
  height: 1px;
  background: linear-gradient(90deg, var(--color-brand-gold), transparent);
}

.hero h1 {
  color: var(--color-dark-text);
  font-size: clamp(1.9rem, 3.2vw, 3rem);
  font-weight: 600;
  line-height: 1.42;
  max-width: 48rem;
}

.hero h1 .mark {
  color: var(--color-gold-lit);
}

.hero .lead {
  margin-top: 1.5rem;
  max-width: 44rem;
  color: var(--color-dark-text-muted);
}

.hero .btn-primary {
  background: var(--color-brand-gold);
  border-color: var(--color-brand-gold);
  color: var(--color-on-gold);
}

.hero .btn-primary:hover {
  background: var(--color-gold-lit);
  border-color: var(--color-gold-lit);
  color: var(--color-ink-deep);
}

.hero .btn-secondary {
  color: var(--color-dark-text);
  border-color: rgba(242, 241, 236, 0.55);
}

.hero .btn-secondary:hover {
  color: var(--color-gold-lit);
  border-color: var(--color-gold-lit);
  background: rgba(255, 255, 255, 0.05);
}

.hero-index {
  position: absolute;
  z-index: 2;
  left: 50%;
  bottom: 1.5rem;
  transform: translateX(-50%);
  display: flex;
  justify-content: space-between;
  color: rgba(242, 241, 236, 0.48);
  font-size: 0.64rem;
}

.page-home .hero + .section {
  background:
    repeating-linear-gradient(0deg, rgba(242, 241, 236, 0.04) 0 1px, transparent 1px 6px),
    var(--color-ink);
  color: var(--color-on-ink-muted);
}

.page-home .hero + .section h2,
.page-home .hero + .section h3 {
  color: var(--color-on-ink);
}

.page-home .hero + .section .lead {
  color: var(--color-on-ink-muted);
}

.section {
  padding-block: clamp(4.5rem, 8vw, 7.5rem);
}

.section--card {
  background-color: var(--color-surface-main);
}

.section--dark {
  background:
    repeating-linear-gradient(0deg, rgba(242, 241, 236, 0.04) 0 1px, transparent 1px 6px),
    var(--color-ink);
  color: var(--color-on-ink-muted);
}

.section--dark h2,
.section--dark h3,
.section--dark a {
  color: var(--color-on-ink);
}

.section--dark p,
.section--dark .note {
  color: var(--color-on-ink-muted);
}

#services-top {
  grid-template-columns: 1fr;
  gap: 0;
  margin-top: 2.5rem;
  border-bottom: 1px solid var(--color-border-soft);
}

#services-top .card {
  display: grid;
  grid-template-columns: 7rem minmax(12rem, 1fr) minmax(16rem, 2fr) auto;
  gap: 1.5rem;
  align-items: center;
  padding-block: 1.7rem;
  border: 0;
  border-top: 1px solid var(--color-border-soft);
  background: transparent;
}

#services-top .card::before {
  width: 5.2rem;
  height: 5.2rem;
  top: 50%;
  left: 0.4rem;
  transform: translateY(-50%);
  border: 1px solid rgba(33, 56, 79, 0.24);
  border-radius: 50%;
  background: transparent;
}

#services-top .card::after {
  content: "";
  position: absolute;
  width: 3.2rem;
  height: 3.2rem;
  left: 2.9rem;
  top: 50%;
  transform: translateY(-58%);
  border: 1px solid rgba(158, 137, 61, 0.58);
  border-radius: 50%;
}

#services-top .card-num {
  position: relative;
  z-index: 1;
  text-align: center;
  margin: 0;
}

#services-top .card h3,
#services-top .card p {
  margin: 0;
}

.site-footer {
  background:
    radial-gradient(ellipse 55% 100% at 50% 0%, rgba(158, 137, 61, 0.06), transparent 55%),
    var(--color-ink-deep);
  color: var(--color-on-ink-muted);
}

.site-footer a,
.site-footer .footer-title,
.site-footer [style*="color:var(--color-dark-text)"] {
  color: var(--color-on-ink-muted) !important;
}

.site-footer a:hover {
  color: var(--color-gold-lit) !important;
}

.footer-copy {
  font-family: var(--font-mono);
  letter-spacing: 0.1em;
}

.drawer-panel {
  background: var(--color-surface-main);
}

@media (max-width: 1023px) {
  #services-top .card {
    grid-template-columns: 6rem 1fr;
  }

  #services-top .card p,
  #services-top .card a {
    grid-column: 2;
  }
}

@media (max-width: 640px) {
  .header-inner {
    min-height: 4.1rem;
  }

  .logo-img {
    height: 1.65rem;
  }

  .hero {
    min-height: min(54rem, 104svh);
  }

  /* SP は縦長。文字は上、輪は下に見せるので、覆いも縦方向にする */
  .hero-kintsugi-img,
  .hero-kintsugi-glow {
    object-position: center 58%;
  }

  .hero::after {
    background:
      linear-gradient(
        to bottom,
        rgba(5, 12, 23, 0.93) 0%,
        rgba(5, 12, 23, 0.84) 26%,
        rgba(5, 12, 23, 0.40) 52%,
        rgba(5, 12, 23, 0.14) 72%,
        rgba(5, 12, 23, 0.34) 100%
      );
  }

  .hero-grid {
    padding-block: 6.5rem 16rem;   /* 下に輪を見せる余白 */
  }

  .hero h1 {
    font-size: clamp(1.75rem, 8vw, 2.35rem);
  }

  #services-top .card {
    grid-template-columns: 4.5rem 1fr;
    gap: 1rem;
  }

  #services-top .card::before {
    width: 4rem;
    height: 4rem;
    left: 0.1rem;
  }

  #services-top .card::after {
    width: 2.5rem;
    height: 2.5rem;
    left: 1.8rem;
  }

  .section {
    padding-block: 3.75rem;
  }
}


/* 図版（案D v1.1 で生成した二重輪の模式図。値は同案のCSSから引き写した） */
.motif-figure {
  position: relative;
  margin: 2rem 0 0;
  overflow: hidden;
  border: 1px solid rgba(33, 56, 79, .2);
  background: #FAF8F4;
  box-shadow: 8px 10px 0 rgba(33, 56, 79, .05);
}
.motif-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 19rem;
  object-fit: cover;
  transition: transform 500ms cubic-bezier(.22, .68, .18, 1);
}
.motif-figure:hover img { transform: scale(1.015); }
.motif-figure__label {
  position: absolute;
  z-index: 1;
  top: .75rem;
  left: .75rem;
  padding: .35rem .5rem;
  color: #FFFFFF;
  background: #21384F;
  border-left: 2px solid #9E893D;
  font: 700 .58rem/1.4 var(--font-sans);
  letter-spacing: .16em;
}
@media (max-width: 767px) {
  .motif-figure img { max-height: none; }
}
@media (prefers-reduced-motion: reduce) {
  .motif-figure img { transition: none; }
  .motif-figure:hover img { transform: none; }
}