:root {
  --green-700: #2f6f58;
  --green-600: #3f8067;
  --green-100: #e7f0ea;
  --blue-700: #315c76;
  --blue-100: #e9f1f5;
  --amber-600: #a97c2b;
  --amber-100: #f6edd7;
  --ink: #26302c;
  --muted: #66706c;
  --line: #dfe5df;
  --paper: #fffdf8;
  --white: #ffffff;
  --shadow: 0 18px 48px rgba(39, 54, 48, .12);
  --radius: 8px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

section[id] {
  scroll-margin-top: 86px;
}

body {
  min-width: 320px;
  font-family: 'Noto Sans JP', sans-serif;
  color: var(--ink);
  line-height: 1.85;
  background: var(--paper);
  overflow-x: hidden;
}

img,
svg {
  display: block;
}

img {
  width: 100%;
  height: auto;
}

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

.container {
  width: min(1120px, calc(100% - 48px));
  margin-inline: auto;
}

.section-band {
  background: linear-gradient(180deg, var(--white), #f4f8f5);
}

.section-kicker,
.eyebrow {
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--green-700);
  text-transform: uppercase;
}

.section-title {
  font-family: 'Noto Serif JP', serif;
  font-size: clamp(1.55rem, 2.5vw, 2.35rem);
  font-weight: 700;
  line-height: 1.55;
  color: var(--ink);
  margin-top: 10px;
}

.section-text {
  color: var(--muted);
  font-size: .98rem;
  line-height: 2;
  margin-top: 18px;
}

.section-heading {
  max-width: 720px;
  margin-bottom: 42px;
}

.section-heading--center {
  text-align: center;
  margin-inline: auto;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 12px 22px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-size: .9rem;
  font-weight: 700;
  line-height: 1.35;
  transition: transform .2s ease, box-shadow .2s ease, background .2s ease, color .2s ease;
}

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

.button--primary {
  color: var(--white);
  background: var(--green-700);
  box-shadow: 0 10px 24px rgba(47, 111, 88, .23);
}

.button--primary:hover {
  background: #245844;
}

.button--ghost {
  color: var(--ink);
  background: rgba(255, 255, 255, .82);
  border-color: rgba(255, 255, 255, .9);
}

.button--outline {
  color: var(--green-700);
  background: transparent;
  border-color: var(--green-700);
}

.button--outline:hover {
  background: var(--green-100);
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  padding: 14px clamp(18px, 4vw, 56px);
  background: rgba(255, 253, 248, .76);
  border-bottom: 1px solid rgba(223, 229, 223, .7);
  backdrop-filter: blur(12px);
  transition: box-shadow .2s ease, background .2s ease;
}

.site-header.is-scrolled {
  background: rgba(255, 253, 248, .94);
  box-shadow: 0 8px 28px rgba(39, 54, 48, .08);
}

.site-header__brand img {
  width: 156px;
  height: auto;
}

.site-header__nav {
  display: flex;
  align-items: center;
  gap: clamp(14px, 3vw, 32px);
  color: #44504b;
  font-size: .86rem;
  font-weight: 700;
}

.site-header__nav a {
  position: relative;
}

.site-header__nav a::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: -8px;
  height: 2px;
  background: var(--green-700);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .2s ease;
}

.site-header__nav a:hover::after {
  transform: scaleX(1);
}

.hero {
  position: relative;
  min-height: 88svh;
  display: flex;
  align-items: center;
  overflow: hidden;
  isolation: isolate;
}

.hero__media,
.hero__shade {
  position: absolute;
  inset: 0;
  z-index: -2;
}

.hero__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.hero__shade {
  z-index: -1;
  background:
    linear-gradient(90deg, rgba(255, 253, 248, .96) 0%, rgba(255, 253, 248, .87) 42%, rgba(255, 253, 248, .28) 76%),
    linear-gradient(180deg, rgba(255, 253, 248, .1), rgba(255, 253, 248, .45));
}

.hero__content {
  width: min(610px, calc(100% - 48px));
  margin-left: clamp(24px, 7vw, 96px);
  padding-top: 68px;
}

.hero h1 {
  font-family: 'Noto Serif JP', serif;
  font-size: clamp(3rem, 8vw, 6.5rem);
  line-height: 1.05;
  color: #17382c;
  margin-top: 14px;
}

.hero__lead {
  max-width: 530px;
  margin-top: 26px;
  color: #3f4b46;
  font-size: clamp(.98rem, 1.4vw, 1.08rem);
  line-height: 2;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 34px;
}

.intro-section {
  padding: 96px 0;
}

.intro-section__grid,
.dust-section__grid,
.support-section__grid {
  display: grid;
  grid-template-columns: .9fr 1.1fr;
  gap: clamp(34px, 6vw, 72px);
  align-items: center;
}

.intro-section__image,
.support-section__image,
.dust-section__image {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.intro-section__image img,
.support-section__image img {
  aspect-ratio: 4 / 5;
  object-fit: cover;
}

.principle-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-top: 32px;
}

.principle-card,
.place-card,
.method-card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 12px 32px rgba(39, 54, 48, .07);
}

.principle-card {
  min-height: 188px;
  padding: 22px 18px;
}

.principle-card__mark {
  display: block;
  color: var(--amber-600);
  font-size: .78rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.principle-card h3,
.place-card h3,
.method-card h3 {
  font-size: 1rem;
  line-height: 1.5;
  color: var(--ink);
}

.principle-card p,
.place-card p,
.method-card p {
  color: var(--muted);
  font-size: .86rem;
  line-height: 1.8;
  margin-top: 10px;
}

.places-section,
.method-section,
.official-section {
  padding: 96px 0;
}

.place-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.place-card {
  overflow: hidden;
}

.place-card img {
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.place-card__body {
  padding: 22px;
}

.dust-section {
  padding: 96px 0;
}

.dust-section__grid {
  grid-template-columns: 1.05fr .95fr;
}

.dust-section__image {
  background: var(--white);
  padding: 18px;
}

.dust-section__image img {
  object-fit: contain;
}

.dust-steps {
  display: grid;
  gap: 14px;
  margin-top: 30px;
}

.dust-step {
  display: grid;
  grid-template-columns: 42px 1fr;
  gap: 14px;
  align-items: center;
  padding: 16px 18px;
  border-radius: var(--radius);
  background: var(--white);
  border: 1px solid var(--line);
}

.dust-step span {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  color: var(--blue-700);
  background: var(--blue-100);
  font-weight: 700;
}

.dust-step p {
  color: #4b5752;
  font-size: .94rem;
  line-height: 1.65;
}

.method-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.method-card {
  padding: 30px 26px;
}

.method-card__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 58px;
  height: 58px;
  border-radius: 50%;
  background: var(--amber-100);
  color: var(--amber-600);
  margin-bottom: 20px;
}

.method-card__icon svg {
  width: 34px;
  height: 34px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2.6;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.support-section {
  padding: 96px 0;
}

.support-section__grid {
  grid-template-columns: 1.05fr .95fr;
}

.support-section__image img {
  aspect-ratio: 16 / 11;
}

.support-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.official-section {
  background:
    linear-gradient(135deg, rgba(49, 92, 118, .94), rgba(47, 111, 88, .92)),
    url("images/CTA.png") center / cover;
  color: var(--white);
}

.official-panel {
  width: min(760px, 100%);
  padding: clamp(34px, 6vw, 56px);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, .12);
  border: 1px solid rgba(255, 255, 255, .24);
  backdrop-filter: blur(8px);
}

.official-panel .section-kicker,
.official-panel .section-title,
.official-panel .section-text {
  color: var(--white);
}

.official-panel .section-text {
  max-width: 620px;
  color: rgba(255, 255, 255, .88);
  margin-bottom: 26px;
}

.notice-section {
  padding: 48px 0;
  background: #fbf7ed;
}

.notice-section__inner {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 24px;
  align-items: start;
  padding: 26px 0;
  border-top: 1px solid #e3d5b7;
  border-bottom: 1px solid #e3d5b7;
}

.notice-section h2 {
  color: #7c611f;
  font-size: .98rem;
}

.notice-section p {
  color: #6b5b3a;
  font-size: .9rem;
  line-height: 1.9;
}

.footer {
  padding: 40px 0 22px;
  color: #d8dedb;
  background: #22302a;
}

.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
}

.footer__brand img {
  width: 150px;
  filter: brightness(0) invert(1) opacity(.88);
}

.footer__nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 16px 24px;
  font-size: .84rem;
}

.footer__nav a:hover {
  color: #ffffff;
}

.footer__copyright {
  margin-top: 24px;
  padding-top: 18px;
  border-top: 1px solid rgba(255, 255, 255, .12);
  color: rgba(216, 222, 219, .62);
  font-size: .76rem;
  text-align: center;
}

.back-to-top {
  position: fixed;
  right: 22px;
  bottom: 22px;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  border: none;
  border-radius: 50%;
  color: var(--white);
  background: var(--green-700);
  box-shadow: 0 10px 24px rgba(39, 54, 48, .22);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity .2s ease, visibility .2s ease, transform .2s ease;
}

.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top svg {
  stroke: currentColor;
  stroke-width: 2.5;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity .7s ease, transform .7s ease;
}

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

@media (max-width: 980px) {
  .site-header__nav {
    gap: 14px;
    font-size: .8rem;
  }

  .intro-section__grid,
  .dust-section__grid,
  .support-section__grid {
    grid-template-columns: 1fr;
  }

  .intro-section__image,
  .support-section__image {
    max-height: 420px;
  }

  .intro-section__image img,
  .support-section__image img {
    aspect-ratio: 16 / 10;
  }

  .principle-list,
  .place-grid,
  .method-grid {
    grid-template-columns: 1fr;
  }

  .principle-card {
    min-height: auto;
  }
}

@media (max-width: 720px) {
  .container {
    width: min(100% - 36px, 1120px);
  }

  .site-header {
    min-height: 64px;
    padding: 12px 18px;
  }

  .site-header__brand img {
    width: 128px;
  }

  .site-header__nav {
    display: none;
  }

  .hero {
    min-height: 90svh;
    align-items: flex-end;
  }

  .hero__media img {
    object-position: 63% center;
  }

  .hero__shade {
    background:
      linear-gradient(180deg, rgba(255, 253, 248, .08) 0%, rgba(255, 253, 248, .72) 48%, rgba(255, 253, 248, .98) 100%),
      linear-gradient(90deg, rgba(255, 253, 248, .72), rgba(255, 253, 248, .22));
  }

  .hero__content {
    width: calc(100% - 36px);
    margin: 0 auto;
    padding: 96px 0 44px;
  }

  .hero h1 {
    font-size: clamp(3rem, 17vw, 4.6rem);
  }

  .hero__lead {
    font-size: .93rem;
    line-height: 1.85;
  }

  .hero__actions,
  .support-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .intro-section,
  .places-section,
  .dust-section,
  .method-section,
  .support-section,
  .official-section {
    padding: 64px 0;
  }

  .section-heading {
    margin-bottom: 30px;
  }

  .section-title {
    font-size: 1.48rem;
  }

  .section-text {
    font-size: .9rem;
    line-height: 1.9;
  }

  .place-card__body,
  .method-card {
    padding: 20px;
  }

  .dust-step {
    grid-template-columns: 36px 1fr;
    padding: 14px;
  }

  .dust-step span {
    width: 36px;
    height: 36px;
  }

  .dust-step p {
    font-size: .86rem;
  }

  .official-panel {
    padding: 30px 22px;
  }

  .notice-section__inner {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .footer__inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .footer__nav {
    justify-content: flex-start;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: .01ms !important;
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
  }
}