body {
  position: relative;
  isolation: isolate;
  color: var(--color-text);
  background-color: var(--color-bg);
}

body.menu-open {
  overflow: hidden;
}

body::before,
body::after {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  height: 100lvh;
  pointer-events: none;
}

body::before {
  z-index: -2;
  background-image:
    url("../../katayama-assets/Mobile_back02.png"),
    linear-gradient(180deg, #732013 0%, #47130d 36%, #240a08 68%, #120704 100%);
  background-image:
    -webkit-image-set(
      url("../../katayama-assets/Mobile_back02.avif") type("image/avif") 1x,
      url("../../katayama-assets/Mobile_back02.webp") type("image/webp") 1x,
      url("../../katayama-assets/Mobile_back02.png") type("image/png") 1x
    ),
    linear-gradient(180deg, #732013 0%, #47130d 36%, #240a08 68%, #120704 100%);
  background-image:
    image-set(
      url("../../katayama-assets/Mobile_back02.avif") type("image/avif") 1x,
      url("../../katayama-assets/Mobile_back02.webp") type("image/webp") 1x,
      url("../../katayama-assets/Mobile_back02.png") type("image/png") 1x
    ),
    linear-gradient(180deg, #732013 0%, #47130d 36%, #240a08 68%, #120704 100%);
  background-position: 30% -20px, center top;
  background-repeat: no-repeat;
  background-size: cover, cover;
  transform: scale(1.06);
  filter: saturate(1.08) contrast(1.03);
}

html[data-mobile-bg="ver2"] body::before {
  background-image:
    url("../../katayama-assets/Mobile_ver2.jpeg"),
    linear-gradient(180deg, #732013 0%, #47130d 36%, #240a08 68%, #120704 100%);
  background-image:
    -webkit-image-set(
      url("../../katayama-assets/Mobile_ver2.avif") type("image/avif") 1x,
      url("../../katayama-assets/Mobile_ver2.webp") type("image/webp") 1x,
      url("../../katayama-assets/Mobile_ver2.jpeg") type("image/jpeg") 1x
    ),
    linear-gradient(180deg, #732013 0%, #47130d 36%, #240a08 68%, #120704 100%);
  background-image:
    image-set(
      url("../../katayama-assets/Mobile_ver2.avif") type("image/avif") 1x,
      url("../../katayama-assets/Mobile_ver2.webp") type("image/webp") 1x,
      url("../../katayama-assets/Mobile_ver2.jpeg") type("image/jpeg") 1x
    ),
    linear-gradient(180deg, #732013 0%, #47130d 36%, #240a08 68%, #120704 100%);
}

body::after {
  z-index: -1;
  background:
    linear-gradient(180deg, rgba(8, 10, 14, 0.12) 0%, rgba(8, 10, 14, 0.04) 26%, rgba(8, 10, 14, 0.72) 100%),
    linear-gradient(90deg, rgba(12, 14, 19, 0.06) 0%, rgba(12, 14, 19, 0.08) 34%, rgba(12, 14, 19, 0.52) 100%);
}

a {
  color: var(--color-text);
}

a:hover {
  color: #ffffff;
}

::selection {
  background: rgba(255, 178, 98, 0.32);
  color: #ffffff;
}

body > a[href="#main"] {
  position: absolute;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 2;
  padding: 0.6rem 0.9rem;
  border: 1px solid var(--color-line-strong);
  border-radius: 999px;
  background: rgba(15, 4, 3, 0.88);
  color: var(--color-text);
  transform: translateY(-140%);
}

body > a[href="#main"]:focus-visible {
  transform: translateY(0);
}

.site-header,
.content-section,
.site-footer {
  width: var(--content-width);
  margin-inline: auto;
}

.site-header {
  padding-top: 0.75rem;
  position: relative;
}

.site-header::before {
  content: "";
  position: absolute;
  top: 1.15rem;
  left: calc((100vw - 100%) / -2 + 0.35rem);
  z-index: 3;
  width: 0.75rem;
  height: clamp(35rem, calc(100svh - 3rem), 47rem);
  pointer-events: none;
  opacity: 0.56;
  background:
    linear-gradient(rgba(255, 255, 255, 0.932), rgba(255, 255, 255, 0.932)) left 0 top calc(clamp(35rem, calc(100svh - 3rem), 47rem) - 2.4rem - 75svh) / 2px 75svh no-repeat,
    linear-gradient(rgba(255, 255, 255, 0.932), rgba(255, 255, 255, 0.932)) left 0.45rem top calc(clamp(35rem, calc(100svh - 3rem), 47rem) - 4.4rem - 20svh) / 2px 20svh no-repeat;
}

.site-header::after {
  content: "";
  position: absolute;
  top: 4rem;
  right: calc((100vw - 100%) / -2 + 0.35rem);
  z-index: 3;
  width: 0.75rem;
  height: clamp(35rem, calc(100svh - 3rem), 47rem);
  pointer-events: none;
  opacity: 0.56;
  background:
    linear-gradient(rgba(255, 255, 255, 0.932), rgba(255, 255, 255, 0.932)) right 0 top 0 / 2px 60svh no-repeat,
    linear-gradient(rgba(255, 255, 255, 0.932), rgba(255, 255, 255, 0.932)) right 0.45rem top 0 / 2px 18svh no-repeat;
}

.global-nav,
.hero-media,
.hero-submedia,
.content-section,
.footer-section,
.footer-nav {
  border: 1px solid var(--color-line);
  background: var(--color-surface);
  backdrop-filter: blur(var(--blur-amount));
  box-shadow: var(--shadow-soft);
}

.global-nav,
.hero,
.content-section,
.site-footer {
  margin-bottom: var(--section-gap);
}

.global-nav,
.section-header,
.feature-with-links,
.split-list,
.site-footer {
  display: grid;
  gap: var(--block-gap);
}

.content-section,
.footer-section,
.footer-nav {
  padding: 1rem;
  border-radius: var(--radius-soft);
}

.site-branding {
  position: relative;
  min-height: clamp(35rem, calc(100svh - 3rem), 47rem);
  padding: 0;
  overflow: hidden;
}

.site-branding::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: url("../../katayama-assets/Kikuyukai_logotext.png");
  background-position: 60% calc(0.5rem + 20px);
  background-repeat: no-repeat;
  background-size: auto 100%;
  pointer-events: none;
  z-index: 0;
  filter: drop-shadow(0 12px 24px rgba(0, 0, 0, 0.28));
}

.site-branding > * {
  position: relative;
  z-index: 2;
}

.menu-toggle,
.menu-close {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--color-text);
}

.menu-toggle {
  position: fixed;
  top: 1rem;
  right: 1rem;
  z-index: 6;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: calc(100vw / 9);
  min-width: 3rem;
  max-width: 4.5rem;
  min-height: 1.75rem;
  padding: 0;
  border: 0;
  background: transparent;
  box-shadow: none;
  transform-origin: 74% 50%;
  will-change: transform;
}

body.menu-open .menu-toggle {
  top: 1.9rem;
  right: 1.9rem;
  width: calc((100vw / 9) * 0.67);
  min-width: 2rem;
  max-width: 3rem;
  aspect-ratio: 1;
  min-height: 2rem;
}

.menu-toggle__label,
.global-nav__eyebrow,
.menu-close {
  font-size: 0.7rem;
  letter-spacing: 0.3em;
  text-transform: lowercase;
}

.menu-toggle__label {
  position: relative;
  display: block;
  width: 100%;
  height: 2rem;
  overflow: hidden;
  color: transparent;
  font-size: 0;
  letter-spacing: 0;
  text-indent: 100%;
  white-space: nowrap;
}

body.menu-open .menu-toggle__label {
  height: 100%;
}

.menu-toggle__label::before,
.menu-toggle__label::after {
  content: "";
  position: absolute;
  right: 0;
  height: 2px;
  background: rgba(255, 255, 255, 0.767);
  transform-origin: center center;
  transition:
    top 520ms cubic-bezier(0.19, 1, 0.22, 1),
    width 520ms cubic-bezier(0.19, 1, 0.22, 1),
    transform 620ms cubic-bezier(0.19, 1, 0.22, 1),
    opacity 360ms ease;
}

.menu-toggle__label::before {
  top: 0.2rem;
  width: 100%;
  box-shadow: 0 0.8rem 0 rgba(255, 255, 255, 0.767);
}

.menu-toggle__label::after {
  top: 1.8rem;
  width: 75%;
}

body.menu-open .menu-toggle__label::before {
  top: 50%;
  width: 100%;
  box-shadow: 0 0 0 transparent;
  transform: rotate(35deg);
}

body.menu-open .menu-toggle__label::after {
  top: 50%;
  width: 100%;
  transform: rotate(-35deg);
}

@media (prefers-reduced-motion: reduce) {
  .menu-toggle,
  .menu-toggle__label::before,
  .menu-toggle__label::after,
  .global-nav,
  .global-nav__panel {
    transition: none;
  }
}

.site-alert,
.site-name-sub,
.site-description {
  display: none;
}

.site-name-sub,
.site-description,
.section-header > a,
.footer-legal,
.copyright,
address {
  color: var(--color-text-soft);
}

.site-name-sub {
  max-width: 18rem;
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  text-shadow: 0 4px 16px rgba(0, 0, 0, 0.35);
}

.site-name-main {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  border: 0;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  overflow: hidden;
  white-space: nowrap;
}

.site-description {
  max-width: 14rem;
  margin-top: auto;
  font-size: 0.95rem;
  text-shadow: 0 4px 16px rgba(0, 0, 0, 0.35);
}

.global-nav {
  position: fixed;
  inset: 0;
  z-index: 5;
  width: auto;
  margin: 0;
  padding: 1rem;
  border: 0;
  overflow-y: auto;
  background: rgba(10, 12, 18, 0.36);
  backdrop-filter: blur(8px);
  box-shadow: none;
  opacity: 0;
  pointer-events: none;
  transition: opacity 320ms ease;
}

.global-nav[hidden] {
  display: none;
}

body.menu-open .global-nav {
  opacity: 1;
  pointer-events: auto;
}

.global-nav__panel {
  margin-left: auto;
  width: min(62vw, 15.5rem);
  min-width: 13.75rem;
  min-height: calc(100svh - 2rem);
  max-height: calc(100svh - 2rem);
  padding: 1rem 1rem 1.25rem;
  overflow-y: auto;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 1.6rem;
  background:
    linear-gradient(180deg, rgba(23, 26, 33, 0.74), rgba(12, 14, 19, 0.88)),
    rgba(12, 14, 19, 0.82);
  backdrop-filter: blur(16px);
  box-shadow: 0 28px 80px rgba(0, 0, 0, 0.4);
  transform: translateX(calc(100% + 1rem));
  transition: transform 420ms cubic-bezier(0.19, 1, 0.22, 1);
  will-change: transform;
}

body.menu-open .global-nav__panel {
  transform: translateX(0);
}

@media (prefers-reduced-motion: reduce) {
  .global-nav,
  .global-nav__panel {
    transition: none;
  }
}

.global-nav__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1rem;
}

.global-nav__eyebrow {
  color: var(--color-text-soft);
}

.menu-close {
  min-width: 4.5rem;
  min-height: 2.5rem;
  padding: 0.45rem 0.75rem;
  border: 1px solid rgba(255, 255, 255, 0.26);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.05);
}

.global-nav .menu-close {
  display: none;
}

.global-nav ul {
  display: grid;
  gap: 0.3rem;
  list-style: none;
}

.global-nav li a {
  display: block;
  padding: 0.7rem 0;
  font-size: 1rem;
  letter-spacing: 0.08em;
}

.section-tabs {
  display: flex;
  gap: 0.15rem;
  align-items: end;
  width: var(--content-width);
  margin: 0 auto calc(var(--section-gap) * 0.5);
  padding: 0 0.25rem;
  border: 0;
  background: transparent;
  backdrop-filter: none;
  box-shadow: none;
}

.section-tabs__button {
  appearance: none;
  position: relative;
  flex: 1 1 0;
  min-height: 2.2rem;
  padding: 0.42rem 0.8rem 0.5rem;
  border: 1px solid rgba(255, 255, 255, 0.18);
  clip-path: polygon(13% 0, 87% 0, 100% 100%, 0 100%);
  background: rgba(255, 255, 255, 0.05);
  color: var(--color-text-soft);
  font-weight: 400;
  letter-spacing: 0.06em;
  box-shadow: none;
  transition: background-color 0.2s ease, color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}

.section-tabs__button[aria-selected="true"] {
  z-index: 1;
  background: rgba(255, 255, 255, 0.14);
  color: #ffffff;
  box-shadow: none;
  transform: translateY(1px);
}

.section-tabs__button:not([aria-selected="true"]) {
  color: rgba(255, 239, 229, 0.72);
}

.search-shortcut {
  width: min(100% - 4rem, 72rem);
  margin: calc(var(--section-gap) * 1.8) auto calc(var(--section-gap) * 1.8);
}

.search-shortcut__trigger {
  appearance: none;
  position: relative;
  display: flex;
  align-items: center;
  width: 100%;
  min-height: 2.6rem;
  padding: 0.45rem 2.7rem 0.45rem 2.7rem;
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 0.3rem;
  background: rgba(10, 12, 18, 0.44);
  color: var(--color-text);
  font-family: var(--font-display);
  font-size: 1.45rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  line-height: 1.1;
  text-align: left;
  cursor: pointer;
}

.search-shortcut__trigger::before,
.search-shortcut__trigger::after {
  content: "";
  position: absolute;
}

.search-shortcut__trigger::before {
  left: 0.7rem;
  top: 37%;
  width: 0.8rem;
  height: 0.8rem;
  border: 1.5px solid currentColor;
  border-radius: 50%;
  transform: translateY(-56%);
  opacity: 0.92;
}

.search-shortcut__trigger::after {
  left: 1.42rem;
  top: 55%;
  width: 0.62rem;
  border-top: 1.5px solid currentColor;
  transform: translateY(0.1rem) rotate(45deg);
  opacity: 0.92;
}

.search-shortcut__chevrons {
  position: absolute;
  right: 1rem;
  top: 50%;
  width: 0.95rem;
  height: 1.05rem;
  transform: translateY(-50%);
  transform-origin: 50% 50%;
  transition: transform 0.2s ease;
}

.search-shortcut__trigger[aria-expanded="true"] .search-shortcut__chevrons {
  transform: translateY(-50%) rotate(180deg);
}

.search-shortcut__chevrons::before,
.search-shortcut__chevrons::after {
  content: "";
  position: absolute;
  left: 50%;
  width: 0.6rem;
  height: 0.6rem;
  border-right: 2px solid rgba(255, 255, 255, 0.52);
  border-bottom: 2px solid rgba(255, 255, 255, 0.52);
  transform: translateX(-50%) rotate(45deg);
}

.search-shortcut__chevrons::before {
  top: 0;
}

.search-shortcut__chevrons::after {
  top: 0.42rem;
}

.about-preview {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: var(--block-gap);
  width: min(100% - 4rem, 72rem);
  margin: calc(var(--section-gap) * -0.9) auto calc(var(--section-gap) * 1.8);
  padding: 0.9rem;
  border: 1px solid var(--color-line);
  border-radius: 0.45rem;
  background: rgba(10, 12, 18, 0.44);
  backdrop-filter: blur(var(--blur-amount));
  box-shadow: var(--shadow-soft);
}

.about-preview[hidden] {
  display: none;
}

.about-preview__media,
.about-preview__body {
  min-height: 6rem;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 0.3rem;
  background: rgba(255, 255, 255, 0.03);
}

.hero {
  display: grid;
  gap: var(--block-gap);
}

.hero-media,
.hero-submedia {
  display: grid;
  place-items: center;
  min-height: 14rem;
  border-radius: var(--radius-card);
  color: var(--color-text-faint);
  letter-spacing: 0.08em;
  background: var(--color-surface-strong);
}

.hero-submedia-list {
  display: none;
  gap: var(--block-gap);
}

.content-section {
  position: relative;
  border-radius: var(--radius-card);
}

#topics,
#calendar {
  border: 1px solid var(--color-line);
  border-radius: 0.45rem;
  overflow: hidden;
  background: rgba(10, 12, 18, 0.44);
}

#topics .section-header,
#calendar .section-header {
  padding-bottom: 0.85rem;
  border-bottom: 1px solid rgba(255, 236, 224, 0.12);
}

.section-header {
  margin-bottom: 1rem;
}

.section-header h2,
.content-section h3,
.site-footer h2 {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: 0.04em;
}

.section-header h2 {
  font-size: clamp(1.5rem, 4vw, 2.35rem);
}

.content-section h3 {
  font-size: 1.125rem;
}

.link-list,
.button-list,
.card-list,
.footer-nav ul {
  display: grid;
  gap: 0.75rem;
  list-style: none;
}

.link-list a,
.button-list a,
.card,
.footer-nav li {
  border-radius: 1rem;
  border: 1px solid var(--color-line);
  background: rgba(255, 255, 255, 0.05);
}

.link-list a,
.button-list a,
.card,
.footer-nav li a {
  display: block;
  padding: 0.85rem 1rem;
}

.card {
  padding: 1rem;
}

.community-section {
  overflow: hidden;
}

.community-slider {
  display: flex;
  gap: 0.75rem;
  margin: 0 -1rem -0.25rem 0;
  padding: 0 1rem 0.5rem 0.75rem;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scroll-behavior: smooth;
  scroll-snap-type: x proximity;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.community-slide {
  flex: 0 0 min(78vw, 18rem);
  scroll-snap-align: start;
  padding: 1rem;
  border: 1px solid var(--color-line);
  border-radius: 1rem;
  background: rgba(255, 255, 255, 0.05);
}

.community-slide h3 {
  margin-bottom: 0.75rem;
}

.community-slide .button-list {
  grid-template-columns: none;
}

.community-slide .button-list a {
  border-radius: 0.75rem;
}

.card p,
.portal-placeholder,
.feature-media {
  color: var(--color-text-soft);
}

.portal-placeholder,
.feature-media {
  min-height: 8rem;
  display: grid;
  place-items: center;
  border: 1px dashed var(--color-line-strong);
  border-radius: 1rem;
  background: rgba(255, 255, 255, 0.05);
}

.split-list,
.feature-with-links,
.site-footer {
  align-items: start;
}

.footer-nav ul {
  margin-top: 0.75rem;
}

.footer-meta {
  display: grid;
  gap: 0.35rem;
  color: var(--color-text-faint);
  font-size: 0.78rem;
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.85rem;
  list-style: none;
  color: inherit;
}

.footer-legal a {
  color: inherit;
  text-decoration: none;
}

.footer-legal a:focus-visible,
.footer-legal a:hover {
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

.copyright {
  color: inherit;
  font-size: inherit;
}

address {
  font-style: normal;
  display: grid;
  gap: 0.35rem;
}