:root {
  --color-paper: #faf8f3;
  --color-white: #ffffff;
  --color-ivory: #f1ede4;
  --color-mist: #dceff3;
  --color-mist-deep: #9cc7cf;
  --color-gold: #c2a66a;
  --color-ink: #263132;
  --color-muted: #667174;
  --color-line: rgba(38, 49, 50, 0.12);
  --shadow-soft: 0 22px 70px rgba(38, 49, 50, 0.08);
  --radius: 8px;
  --content: min(1120px, calc(100vw - 40px));
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.9), rgba(250, 248, 243, 0.95)),
    var(--color-paper);
  color: var(--color-ink);
  font-family: "Yu Gothic", "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
  line-height: 1.8;
  letter-spacing: 0;
}

body.nav-open {
  overflow: hidden;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
}

a {
  color: inherit;
  text-decoration: none;
}

:focus-visible {
  outline: 2px solid var(--color-gold);
  outline-offset: 4px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  min-height: 72px;
  padding: 14px clamp(20px, 4vw, 48px);
  background: rgba(250, 248, 243, 0.86);
  border-bottom: 1px solid rgba(194, 166, 106, 0.18);
  backdrop-filter: blur(18px);
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-size: clamp(1rem, 2.4vw, 1.24rem);
  font-weight: 600;
  line-height: 1;
  white-space: nowrap;
}

.brand-symbol {
  width: 22px;
  height: 22px;
  border: 1px solid var(--color-gold);
  border-radius: 50%;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.65), rgba(220, 239, 243, 0.75)),
    var(--color-white);
  box-shadow: inset 0 0 0 5px rgba(255, 255, 255, 0.9);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(16px, 2.4vw, 28px);
  color: var(--color-muted);
  font-size: 0.88rem;
}

.site-nav a {
  position: relative;
  padding: 8px 0;
}

.site-nav a::after {
  position: absolute;
  left: 0;
  bottom: 2px;
  width: 100%;
  height: 1px;
  content: "";
  background: var(--color-gold);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 220ms ease;
}

.site-nav a:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--color-line);
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.72);
  color: var(--color-ink);
}

.nav-toggle span:not(.sr-only) {
  display: block;
  width: 18px;
  height: 1px;
  margin: 5px auto;
  background: currentColor;
  transition: transform 180ms ease;
}

.nav-open .nav-toggle span:first-child {
  transform: translateY(3px) rotate(35deg);
}

.nav-open .nav-toggle span:nth-child(2) {
  transform: translateY(-3px) rotate(-35deg);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(320px, 1.08fr);
  gap: clamp(32px, 6vw, 92px);
  align-items: center;
  width: var(--content);
  min-height: calc(100svh - 72px);
  margin: 0 auto;
  padding: clamp(40px, 8vw, 92px) 0 clamp(22px, 5vw, 56px);
}

.hero-copy,
.product-hero-copy {
  max-width: 600px;
}

.eyebrow {
  margin: 0 0 16px;
  color: var(--color-gold);
  font-size: 0.76rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  line-height: 1.4;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  overflow-wrap: anywhere;
}

h1,
h2 {
  margin: 0;
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-weight: 500;
  line-height: 1.28;
}

h1 {
  font-size: clamp(2.42rem, 9vw, 5.9rem);
}

h2 {
  font-size: clamp(1.72rem, 5vw, 3.15rem);
}

h3 {
  margin: 0;
  font-size: clamp(1rem, 2vw, 1.18rem);
  line-height: 1.55;
}

.hero-lead {
  margin: 24px 0 0;
  max-width: 37rem;
  color: var(--color-muted);
  font-size: clamp(1rem, 2vw, 1.08rem);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 13px 22px;
  border: 1px solid var(--color-line);
  border-radius: 999px;
  font-size: 0.92rem;
  font-weight: 600;
  transition: transform 180ms ease, background 180ms ease, border-color 180ms ease;
}

.button:hover {
  transform: translateY(-2px);
}

.button-primary {
  background: var(--color-ink);
  border-color: var(--color-ink);
  color: var(--color-white);
}

.button-soft {
  background: rgba(255, 255, 255, 0.62);
}

.hero-visual,
.product-hero-image {
  position: relative;
  margin: 0;
  padding: clamp(18px, 4vw, 34px);
  background: rgba(255, 255, 255, 0.62);
  border: 1px solid rgba(194, 166, 106, 0.2);
  border-radius: var(--radius);
  box-shadow: var(--shadow-soft);
  overflow: hidden;
}

.hero-visual::before,
.product-hero-image::before,
.glass-frame::before {
  position: absolute;
  inset: 16px;
  content: "";
  border: 1px solid rgba(156, 199, 207, 0.28);
  pointer-events: none;
}

.hero-visual img,
.product-hero-image img {
  position: relative;
  z-index: 1;
}

.intro-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  width: var(--content);
  margin: 0 auto;
  border-top: 1px solid var(--color-line);
  border-bottom: 1px solid var(--color-line);
}

.intro-strip p {
  margin: 0;
  padding: 18px 12px;
  color: var(--color-muted);
  font-size: 0.84rem;
  text-align: center;
  border-right: 1px solid var(--color-line);
}

.intro-strip p:last-child {
  border-right: 0;
}

.section {
  width: var(--content);
  margin: 0 auto;
  padding: clamp(72px, 12vw, 132px) 0;
}

.section-heading {
  max-width: 760px;
  margin-bottom: clamp(30px, 6vw, 58px);
}

.section-heading p:not(.eyebrow) {
  margin: 18px 0 0;
  color: var(--color-muted);
}

.split-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.86fr) minmax(300px, 1.14fr);
  gap: clamp(28px, 5vw, 70px);
  align-items: center;
}

.panel-text {
  padding: clamp(22px, 4vw, 42px) 0;
  color: var(--color-muted);
}

.panel-text p {
  margin: 0 0 18px;
}

.glass-frame {
  position: relative;
  margin: 0;
  padding: 22px;
  background: rgba(255, 255, 255, 0.56);
  border: 1px solid rgba(194, 166, 106, 0.2);
  border-radius: var(--radius);
  box-shadow: var(--shadow-soft);
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

.product-card {
  min-width: 0;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid rgba(38, 49, 50, 0.1);
  border-radius: var(--radius);
  transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease;
}

.product-card:hover {
  transform: translateY(-4px);
  border-color: rgba(194, 166, 106, 0.44);
  box-shadow: var(--shadow-soft);
}

.product-card a {
  display: grid;
  gap: 18px;
  height: 100%;
  padding: 18px;
}

.product-card img {
  width: 100%;
  aspect-ratio: 1 / 1.16;
  object-fit: contain;
  background: linear-gradient(180deg, rgba(220, 239, 243, 0.18), rgba(255, 255, 255, 0.34));
  border-radius: 6px;
}

.product-card p {
  margin: 8px 0 0;
  color: var(--color-muted);
  font-size: 0.9rem;
}

.product-type {
  margin: 0 0 8px !important;
  color: var(--color-gold) !important;
  font-size: 0.76rem !important;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.text-link {
  display: inline-block;
  margin-top: 14px;
  color: var(--color-ink);
  font-size: 0.88rem;
  font-weight: 700;
}

.text-link::after {
  content: " 〉";
  color: var(--color-gold);
}

.science-section {
  position: relative;
}

.science-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.science-card,
.detail-card {
  padding: clamp(24px, 4vw, 36px);
  background: rgba(255, 255, 255, 0.58);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
}

.science-line {
  display: block;
  width: 64px;
  height: 2px;
  margin-bottom: 24px;
  background: linear-gradient(90deg, var(--color-gold), var(--color-mist-deep));
}

.science-card p,
.detail-card p {
  margin: 14px 0 0;
  color: var(--color-muted);
}

.routine-section {
  border-top: 1px solid var(--color-line);
  border-bottom: 1px solid var(--color-line);
}

.routine-list {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--color-line);
}

.routine-item {
  display: grid;
  grid-template-columns: 130px 1fr minmax(160px, 260px);
  gap: 18px;
  align-items: center;
  padding: 24px 0;
  border-bottom: 1px solid var(--color-line);
}

.routine-item p {
  margin: 0;
  color: var(--color-gold);
  font-size: 0.86rem;
  font-weight: 700;
}

.routine-item span {
  color: var(--color-muted);
  font-size: 0.9rem;
}

.faq-list {
  max-width: 820px;
  border-top: 1px solid var(--color-line);
}

details {
  border-bottom: 1px solid var(--color-line);
}

summary {
  cursor: pointer;
  padding: 22px 0;
  font-weight: 700;
  list-style: none;
}

summary::-webkit-details-marker {
  display: none;
}

summary::after {
  float: right;
  color: var(--color-gold);
  content: "+";
  font-size: 1.2rem;
}

details[open] summary::after {
  content: "";
  width: 12px;
  height: 1px;
  margin-top: 14px;
  background: var(--color-gold);
}

details p {
  margin: -4px 0 24px;
  color: var(--color-muted);
}

.company-card {
  max-width: 880px;
  padding: clamp(24px, 5vw, 46px);
  background: rgba(255, 255, 255, 0.62);
  border: 1px solid rgba(194, 166, 106, 0.2);
  border-radius: var(--radius);
}

dl {
  margin: 0;
}

dl div {
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: 18px;
  padding: 15px 0;
  border-bottom: 1px solid var(--color-line);
}

dt {
  color: var(--color-gold);
  font-weight: 700;
}

dd {
  margin: 0;
  color: var(--color-muted);
}

.notice {
  margin: 24px 0 0;
  color: var(--color-muted);
  font-size: 0.86rem;
}

.site-footer {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 22px;
  align-items: end;
  padding: 42px clamp(20px, 4vw, 48px);
  background: #eef3f2;
  border-top: 1px solid var(--color-line);
}

.site-footer p,
.site-footer small,
.site-footer nav {
  margin: 10px 0 0;
  color: var(--color-muted);
  font-size: 0.84rem;
}

.site-footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.product-hero {
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(320px, 0.78fr);
  gap: clamp(30px, 6vw, 84px);
  align-items: center;
  width: var(--content);
  margin: 0 auto;
  padding: clamp(48px, 9vw, 110px) 0 clamp(40px, 7vw, 84px);
}

.breadcrumb {
  margin: 0 0 28px;
  color: var(--color-muted);
  font-size: 0.82rem;
}

.breadcrumb a {
  border-bottom: 1px solid rgba(194, 166, 106, 0.45);
}

.capacity {
  margin: 14px 0 0;
  color: var(--color-gold);
  font-size: 1rem;
  font-weight: 700;
}

.detail-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.detail-card h2 {
  font-size: clamp(1.25rem, 3vw, 1.72rem);
}

.product-concept-visual {
  width: var(--content);
  margin: 0 auto clamp(44px, 8vw, 84px);
  overflow: hidden;
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid rgba(194, 166, 106, 0.2);
  border-radius: var(--radius);
  box-shadow: var(--shadow-soft);
}

.product-concept-visual img {
  width: 100%;
  aspect-ratio: 1400 / 788;
  object-fit: cover;
}

.ingredient-band {
  width: 100%;
  max-width: none;
  padding-right: max(20px, calc((100vw - 1120px) / 2));
  padding-left: max(20px, calc((100vw - 1120px) / 2));
  background:
    linear-gradient(90deg, rgba(220, 239, 243, 0.36), rgba(255, 255, 255, 0.42), rgba(241, 237, 228, 0.8)),
    var(--color-ivory);
}

.ingredient-band .section-heading {
  margin-bottom: 0;
}

.next-products {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  width: var(--content);
  margin: 0 auto clamp(56px, 9vw, 96px);
}

.next-products a {
  flex: 1 1 190px;
  padding: 16px 18px;
  background: rgba(255, 255, 255, 0.68);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  color: var(--color-muted);
  font-size: 0.92rem;
  text-align: center;
}

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 650ms ease, transform 650ms ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 980px) {
  .hero,
  .product-hero,
  .split-layout {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
  }

  .hero-copy,
  .product-hero-copy {
    max-width: none;
  }

  .product-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .science-grid,
  .detail-grid {
    grid-template-columns: 1fr;
  }

  .routine-item {
    grid-template-columns: 92px 1fr;
  }

  .routine-item span {
    grid-column: 2;
  }

  .site-footer {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 760px) {
  :root {
    --content: min(100vw - 32px, 1120px);
  }

  .site-header {
    min-height: 64px;
    padding: 12px 16px;
  }

  .nav-toggle {
    display: inline-block;
  }

  .site-nav {
    position: fixed;
    inset: 64px 12px auto 12px;
    display: grid;
    gap: 0;
    padding: 12px;
    background: rgba(250, 248, 243, 0.98);
    border: 1px solid rgba(194, 166, 106, 0.22);
    border-radius: var(--radius);
    box-shadow: var(--shadow-soft);
    opacity: 0;
    pointer-events: none;
    transform: translateY(-8px);
    transition: opacity 180ms ease, transform 180ms ease;
  }

  .nav-open .site-nav {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
  }

  .site-nav a {
    padding: 14px 8px;
    border-bottom: 1px solid var(--color-line);
  }

  .site-nav a:last-child {
    border-bottom: 0;
  }

  .hero,
  .product-hero {
    padding-top: 34px;
  }

  .hero-visual,
  .product-hero-image {
    padding: 14px;
  }

  .intro-strip {
    grid-template-columns: repeat(2, 1fr);
  }

  .intro-strip p:nth-child(2) {
    border-right: 0;
  }

  .intro-strip p:nth-child(-n + 2) {
    border-bottom: 1px solid var(--color-line);
  }

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

  .product-card a {
    grid-template-columns: 120px 1fr;
    align-items: center;
  }

  .product-card img {
    aspect-ratio: 1 / 1.25;
  }

  .routine-item {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .routine-item span {
    grid-column: auto;
  }

  dl div {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .button {
    width: 100%;
  }

  .product-concept-visual img {
    aspect-ratio: 4 / 3;
    object-position: left center;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}