:root {
  --ink: #1f2933;
  --muted: #667085;
  --line: #d9e1e7;
  --paper: #ffffff;
  --washi: #f7f4ee;
  --sumi: #223044;
  --indigo: #234f73;
  --green: #2f7d67;
  --vermillion: #c65d3b;
  --gold: #d6a84f;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Yu Gothic", "Hiragino Kaku Gothic ProN", "Noto Sans JP", Meiryo, Arial, sans-serif;
  line-height: 1.75;
}

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 78px;
  padding: 10px clamp(18px, 5vw, 72px);
  border-bottom: 1px solid rgba(217, 225, 231, 0.88);
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(14px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-width: 360px;
}

.brand img {
  width: 170px;
  height: 58px;
  object-fit: contain;
  object-position: left center;
}

.brand span {
  display: grid;
  gap: 1px;
}

.brand strong {
  color: var(--ink);
  font-weight: 800;
  line-height: 1.25;
}

.brand strong:first-child {
  font-size: 12px;
}

.brand strong:last-child {
  font-size: 16px;
}

.nav {
  display: flex;
  align-items: center;
  gap: clamp(14px, 2vw, 26px);
  color: #4b5563;
  font-size: 14px;
  font-weight: 800;
  white-space: nowrap;
}

.nav a:hover {
  color: var(--green);
}

.menu-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.menu-toggle span {
  display: block;
  width: 19px;
  height: 2px;
  margin: 5px auto;
  background: var(--ink);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(360px, 1.08fr);
  gap: clamp(28px, 5vw, 72px);
  align-items: center;
  min-height: calc(86vh - 78px);
  padding: clamp(52px, 7vw, 96px) clamp(18px, 5vw, 72px) clamp(38px, 5vw, 72px);
  background:
    linear-gradient(135deg, rgba(35, 79, 115, 0.1), rgba(47, 125, 103, 0.08)),
    var(--washi);
}

.hero-copy {
  max-width: 720px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--vermillion);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 22px;
  font-size: clamp(34px, 6.4vw, 60px);
  line-height: 1.12;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 14px;
  font-size: clamp(30px, 4.4vw, 48px);
  line-height: 1.22;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 8px;
  font-size: 21px;
  line-height: 1.35;
}

.hero-copy p {
  color: var(--muted);
  font-size: 18px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 30px;
}

.button,
.contact-form button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  border: 0;
  border-radius: 8px;
  padding: 0 22px;
  font: inherit;
  font-weight: 900;
  cursor: pointer;
}

.primary,
.contact-form button {
  color: #fff;
  background: var(--green);
  box-shadow: 0 16px 34px rgba(47, 125, 103, 0.22);
}

.secondary {
  color: var(--indigo);
  background: #fff;
  border: 1px solid var(--line);
}

.hero-media {
  display: block;
}

.hero-photo {
  width: 100%;
  border-radius: 8px;
  object-fit: cover;
  box-shadow: 0 24px 52px rgba(34, 48, 68, 0.16);
}

.intro-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: #fff;
}

.intro-strip div {
  padding: 20px clamp(14px, 2vw, 24px);
  border-right: 1px solid var(--line);
}

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

.intro-strip span {
  display: block;
  color: var(--green);
  font-size: 13px;
  font-weight: 900;
}

.intro-strip strong {
  display: block;
  font-size: 20px;
}

.section,
.split-section,
.membership-section,
.contact {
  padding: clamp(54px, 7vw, 92px) clamp(18px, 5vw, 72px);
}

.section-head,
.section-copy {
  max-width: 820px;
  margin-bottom: 34px;
}

.section-head p,
.section-copy p,
.principle-grid p,
.program-grid span,
.timeline p,
.membership-section p,
.contact p,
.contact dd {
  color: var(--muted);
}

.split-section {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 0.82fr);
  gap: clamp(28px, 5vw, 64px);
  align-items: center;
}

.statement-box {
  padding: clamp(24px, 4vw, 40px);
  border-left: 4px solid var(--gold);
  background: var(--sumi);
  color: #fff;
}

.statement-box p {
  color: var(--gold);
  font-weight: 900;
}

.statement-box ul {
  display: grid;
  gap: 10px;
  margin: 22px 0 0;
  padding-left: 20px;
}

.principles-section {
  background: var(--washi);
}

.principle-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.principle-grid article {
  min-height: 240px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.principle-grid span {
  display: block;
  margin-bottom: 24px;
  color: var(--indigo);
  font-size: 15px;
  font-weight: 900;
}

.principle-grid small {
  display: block;
  color: var(--green);
  font-size: 13px;
}

.principle-grid .wide {
  grid-column: span 2;
  color: #fff;
  background: var(--indigo);
}

.principle-grid .wide p,
.principle-grid .wide small,
.principle-grid .wide span {
  color: #e5eff5;
}

.program-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.program-grid article {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.program-grid img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.program-grid div {
  padding: 24px;
}

.program-grid p {
  margin-bottom: 8px;
  color: var(--vermillion);
  font-size: 13px;
  font-weight: 900;
}

.events-section {
  background: #f8fbfa;
}

.timeline,
.news-list {
  display: grid;
  max-width: 980px;
}

.timeline article,
.news-list article {
  display: grid;
  grid-template-columns: 150px minmax(0, 1fr);
  gap: 22px;
  padding: 24px 0;
  border-top: 1px solid var(--line);
}

.timeline time,
.news-list time {
  color: var(--indigo);
  font-weight: 900;
}

.news-section {
  background: #fff;
}

.news-list a {
  font-size: 19px;
  font-weight: 900;
}

.news-list a:hover {
  color: var(--green);
}

.membership-section {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  background:
    linear-gradient(90deg, rgba(35, 79, 115, 0.08), rgba(198, 93, 59, 0.08)),
    var(--washi);
}

.membership-section div {
  max-width: 760px;
}

.contact {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(320px, 0.78fr);
  gap: clamp(26px, 5vw, 58px);
  background: var(--sumi);
  color: #fff;
}

.contact .eyebrow {
  color: var(--gold);
}

.contact dl {
  display: grid;
  gap: 12px;
  margin: 28px 0 0;
}

.contact dl div {
  display: grid;
  grid-template-columns: 90px minmax(0, 1fr);
  gap: 12px;
}

.contact dt {
  color: #fff;
  font-weight: 900;
}

.contact dd {
  margin: 0;
}

.contact-form {
  display: grid;
  gap: 14px;
  padding: 24px;
  border-radius: 8px;
  color: var(--ink);
  background: #fff;
  box-shadow: 0 18px 45px rgba(0, 0, 0, 0.2);
}

.contact-form label {
  display: grid;
  gap: 7px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 800;
}

.contact-form input,
.contact-form select,
.contact-form textarea {
  width: 100%;
  min-height: 46px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px 12px;
  color: var(--ink);
  background: #fff;
  font: inherit;
}

.contact-form textarea {
  resize: vertical;
}

.form-note {
  min-height: 22px;
  margin: 0;
  color: var(--green);
  font-weight: 800;
}

.footer {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 24px clamp(18px, 5vw, 72px);
  color: var(--muted);
  border-top: 1px solid var(--line);
}

@media (max-width: 1080px) {
  .principle-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (max-width: 900px) {
  .menu-toggle {
    display: block;
  }

  .nav {
    position: absolute;
    top: 78px;
    right: 18px;
    left: 18px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 12px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #fff;
    box-shadow: 0 18px 40px rgba(34, 48, 68, 0.14);
  }

  .nav.is-open {
    display: flex;
  }

  .nav a {
    padding: 12px;
  }

  .hero,
  .split-section,
  .contact {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
  }

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

  .membership-section {
    align-items: stretch;
    flex-direction: column;
  }
}

@media (max-width: 640px) {
  .brand {
    min-width: 0;
  }

  .brand img {
    width: 96px;
    height: 46px;
  }

  .brand strong:first-child {
    font-size: 10px;
  }

  .brand strong:last-child {
    font-size: 14px;
  }

  h1 {
    font-size: 36px;
  }

  .hero-media,
  .intro-strip,
  .principle-grid,
  .timeline article,
  .news-list article,
  .contact dl div {
    grid-template-columns: 1fr;
  }

  .principle-grid .wide {
    grid-column: auto;
  }

  .button,
  .contact-form button {
    width: 100%;
  }

  .footer {
    flex-direction: column;
  }
}