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

:root {
  --color-header-bg: #d7e4d7;
  --color-primary: #607980;
  --color-primary-dark: #074151;
  --color-text: #333333;
  --color-text-muted: #607980;
  --color-border: #c5d5c5;
  --color-news-bg: #f1f1f1;
  --color-btn: #607980;
  --color-btn-hover: #4d656b;
  --max-width: 1200px;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Noto Sans JP", "Hiragino Kaku Gothic ProN", "MS Gothic", sans-serif;
  color: var(--color-text);
  background: #fff;
  line-height: 1.7;
}

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

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

ul {
  list-style: none;
}

/* Header */
.site-header {
  background: var(--color-header-bg);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.site-header__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0.5rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 64px;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
  line-height: 0;
}

.site-logo__icon {
  display: block;
  height: 48px;
  width: auto;
}

.site-logo__text {
  display: block;
  height: 48px;
  width: auto;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 0;
}

.site-nav__list {
  display: flex;
  align-items: center;
}

.site-nav__link {
  display: block;
  padding: 0.75rem 1.25rem;
  font-size: 0.95rem;
  color: var(--color-text);
  border-left: 1px solid rgba(96, 121, 128, 0.35);
  background: none;
  border-top: none;
  border-right: none;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  font-family: inherit;
}

.site-nav__list > li:first-child .site-nav__link {
  border-left: none;
}

.site-nav__link--active,
.site-nav__link:hover {
  border-bottom-color: var(--color-primary-dark);
}

.site-nav__dropdown {
  position: relative;
}

.site-nav__submenu {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 180px;
  background: #fff;
  border: 1px solid var(--color-border);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
  z-index: 10;
}

.site-nav__submenu a {
  display: block;
  padding: 0.75rem 1rem;
  font-size: 0.9rem;
  border-bottom: 1px solid #eee;
}

.site-nav__submenu a:hover {
  background: #f5f8f5;
}

.site-nav__submenu-item {
  display: block;
  padding: 0.75rem 1rem;
  font-size: 0.9rem;
  border-bottom: 1px solid #eee;
  color: var(--color-text);
}

.site-nav__link--static {
  cursor: default;
}

.site-nav__link--static:hover {
  border-bottom-color: transparent;
}

.site-nav__link--static.site-nav__link--active {
  border-bottom-color: var(--color-primary-dark);
}

.site-nav__dropdown.is-open .site-nav__submenu {
  display: block;
}

.btn-contact {
  margin-left: 1rem;
  padding: 0.55rem 1.5rem;
  background: var(--color-primary-dark);
  color: #fff;
  font-size: 0.9rem;
  white-space: nowrap;
}

.btn-contact:hover {
  background: #053040;
}

.btn-contact--static {
  cursor: default;
}

.btn-contact--static:hover {
  background: var(--color-primary-dark);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-primary-dark);
}

/* Hero */
.hero {
  background: #fff;
  text-align: center;
}

.hero__copy {
  padding: 1rem 1.5rem 1rem;
}

.hero__line {
  font-size: clamp(1.5rem, 3.5vw, 3rem);
  line-height: 1.45;
  font-weight: 400;
}

.hero__line--dark {
  color: var(--color-primary-dark);
}

.hero__line--muted {
  color: var(--color-text-muted);
}

.hero__notice {
  max-width: 720px;
  margin: 1.75rem auto 0;
  padding: 0 1.5rem;
}

.hero__notice-card {
  background: linear-gradient(160deg, #f7faf7 0%, #ffffff 55%, #f2f7f4 100%);
  border: 1px solid rgba(7, 65, 81, 0.1);
  border-radius: 16px;
  padding: 1.5rem 1.75rem 1.6rem;
  box-shadow: 0 8px 32px rgba(7, 65, 81, 0.07);
  text-align: center;
}

.hero__notice-badge {
  display: inline-block;
  padding: 0.3rem 1rem;
  margin-bottom: 0.85rem;
  background: var(--color-primary-dark);
  color: #fff;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  border-radius: 999px;
}

.hero__notice-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-primary-dark);
  margin-bottom: 0.75rem;
  line-height: 1.5;
}

.hero__notice-text {
  font-size: 0.95rem;
  line-height: 1.9;
  color: #4a5568;
}

.hero__notice-text strong {
  color: var(--color-primary-dark);
  font-weight: 700;
}

.hero__visual {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 1.5rem 0.5rem;
}

.hero__visual img {
  width: 100%;
  max-width: 960px;
  height: auto;
  max-height: 300px;
  object-fit: contain;
  object-position: center bottom;
  margin: 0 auto;
}

/* Audience strip */
.audience-strip {
  padding: 3rem 1.5rem;
  background: #fff;
}

.audience-strip__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.audience-card {
  text-align: center;
}

.audience-card__btn {
  display: inline-block;
  padding: 0.65rem 2rem;
  border: 1px solid var(--color-primary);
  color: var(--color-primary);
  font-size: 1rem;
  margin-bottom: 1.25rem;
  transition: background 0.2s, color 0.2s;
}

.audience-card__btn:hover {
  background: var(--color-primary);
  color: #fff;
}

.audience-card__btn--static {
  cursor: default;
}

.audience-card__btn--static:hover {
  background: transparent;
  color: var(--color-primary);
}

.audience-card__text {
  font-size: 1.05rem;
  line-height: 1.8;
}

/* What we do */
.what-we-do {
  padding: 3rem 1.5rem 4rem;
  background: #fff;
}

.what-we-do__label {
  text-align: center;
  font-size: 1.75rem;
  font-weight: 300;
  color: var(--color-primary-dark);
  margin-bottom: 2rem;
  letter-spacing: 0.02em;
}

.what-we-do__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.5rem;
  align-items: center;
}

.what-we-do__text {
  font-size: 1.15rem;
  line-height: 2;
  color: var(--color-text);
}

.what-we-do__text strong {
  font-weight: 700;
}

/* News */
.news {
  padding: 2rem 1.5rem 4rem;
  background: #fff;
}

.news__title {
  text-align: center;
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 400;
  color: var(--color-primary-dark);
  margin-bottom: 2.5rem;
}

.news__grid {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.news-card {
  border: 1px solid #e8e8e8;
}

.news-card__image {
  display: block;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: #fafafa;
}

.news-card__image img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  padding: 0.5rem;
}

.news-card__body {
  background: var(--color-news-bg);
  padding: 1rem 1.25rem;
  min-height: 81px;
  text-align: center;
}

.news-card__title {
  font-size: 0.85rem;
  line-height: 1.5;
}

.news-card__date {
  font-size: 0.8rem;
  color: #666;
  margin-top: 0.35rem;
}

/* Audience footer buttons */
.audience-footer {
  max-width: var(--max-width);
  margin: 0 auto 3rem;
  padding: 0 1.5rem;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.audience-footer__btn {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  border: 1px solid var(--color-primary);
  color: var(--color-primary);
  font-size: 1rem;
}

.audience-footer__btn:hover {
  background: var(--color-primary);
  color: #fff;
}

.audience-footer__btn--static {
  cursor: default;
}

.audience-footer__btn--static:hover {
  background: transparent;
  color: var(--color-primary);
}

.audience-footer__btn span {
  font-size: 1.25rem;
}

/* Footer */
.site-footer {
  background: var(--color-header-bg);
  padding: 2.5rem 1.5rem 2rem;
  position: relative;
}

.go-top {
  position: absolute;
  top: 1.5rem;
  right: 2rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
  color: var(--color-primary);
  font-size: 0.85rem;
}

.go-top__icon {
  display: grid;
  place-items: center;
  width: 2.5rem;
  height: 2.5rem;
  border: 1px solid var(--color-primary);
  border-radius: 50%;
  font-size: 1rem;
}

.site-footer__info {
  max-width: var(--max-width);
  margin: 0 auto;
  text-align: right;
  font-size: 0.95rem;
  line-height: 1.9;
  color: var(--color-text);
}

.site-footer__org {
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.site-footer__rep {
  margin-top: 0.5rem;
}

.site-footer__copy {
  margin-top: 1rem;
  font-size: 0.85rem;
}

/* Subpage */
.page-content {
  max-width: 800px;
  margin: 0 auto;
  padding: 4rem 1.5rem;
}

.page-content h1 {
  font-size: 1.75rem;
  color: var(--color-primary-dark);
  margin-bottom: 1.5rem;
  text-align: center;
}

.page-content p {
  font-size: 1.05rem;
  line-height: 1.9;
  margin-bottom: 1rem;
}

.page-back {
  display: inline-block;
  margin-top: 2rem;
  color: var(--color-primary);
  text-decoration: underline;
}

/* Responsive */
@media (max-width: 960px) {
  .audience-strip__inner,
  .what-we-do__inner,
  .news__grid,
  .audience-footer {
    grid-template-columns: 1fr;
  }

  .what-we-do__inner {
    gap: 1.5rem;
  }
}

@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .site-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--color-header-bg);
    border-bottom: 1px solid var(--color-border);
    padding: 1rem;
  }

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

  .site-nav__list {
    flex-direction: column;
    width: 100%;
  }

  .site-nav__link {
    border-left: none;
    border-bottom: 1px solid rgba(96, 121, 128, 0.2);
    width: 100%;
  }

  .site-nav__submenu {
    position: static;
    box-shadow: none;
    border: none;
    background: rgba(255, 255, 255, 0.5);
  }

  .btn-contact {
    margin: 0.75rem 0 0;
    text-align: center;
    display: block;
  }

  .site-header__inner {
    position: relative;
    flex-wrap: wrap;
  }

  .go-top {
    position: static;
    margin-bottom: 1.5rem;
    align-items: flex-end;
  }

  .site-footer__info {
    text-align: left;
  }
}