@font-face {
  font-family: "Makinas4";
  src:
    url("../fonts/Makinas4-Flat.woff2") format("woff2"),
    url("../fonts/Makinas4-Flat.otf") format("opentype"),
    url("../fonts/Makinas-4-Flat.woff2") format("woff2"),
    url("../fonts/Makinas-4-Flat.otf") format("opentype");
  font-display: swap;
}

@font-face {
  font-family: "KawashiroKika";
  src:
    url("../fonts/KawashiroKikaTai-Regular.otf") format("opentype"),
    url("../fonts/KawashiroKikaTai-Regular.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

:root {
  --white: #ffffff;
  --ice: #eaf2fa;
  --blue: #0c64b3;
  --navy: #0c2244;
  --font-jp: "Makinas4", "Yu Gothic", "YuGothic", "Hiragino Sans", "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
  --font-en: "KawashiroKika", "Makinas4", "Segoe UI", "Helvetica Neue", sans-serif;
  --header-h: 4.5rem;
  --wrap-max: 1080px;
  --page-inline: 1.25rem;
  --tri-edge: 45px;
  --tri-rows: 8;
  --tri-row-h: calc(var(--tri-edge) * 0.8660254037844386);
  --tri-band-height: calc(var(--tri-row-h) * var(--tri-rows));
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--navy);
  background: var(--white);
  font-family: var(--font-jp);
  line-height: 1.75;
  overflow-x: clip;
}

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

a {
  color: var(--blue);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}

a:hover {
  color: var(--navy);
}

.skip-link {
  position: absolute;
  left: 0.75rem;
  top: -3rem;
  z-index: 80;
  padding: 0.5rem 0.8rem;
  background: var(--navy);
  color: var(--white);
}

.skip-link:focus {
  top: 0.75rem;
}

.tri-pattern {
  position: relative;
  isolation: isolate;
  background-color: var(--white);
  overflow: hidden;
}

/* ページ左右端まで帯を広げる */
.tri-layer {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 0;
  width: 100%;
  height: var(--tri-band-height);
  pointer-events: none;
  background-color: transparent;
  background-image: url("../assets/tri-dispersion.svg");
  background-repeat: no-repeat;
  background-position: left top;
  background-size: 100% 100%;
  mask-repeat: no-repeat;
  -webkit-mask-repeat: no-repeat;
}

.hero.tri-pattern > .tri-layer {
  top: 4rem; /* .hero padding-top と揃える */
}

/* トップ：タイトル上下に帯を分け、文字と重ならない隙間を確保 */
.hero--tri-stack {
  --tri-title-gap: 0.85rem;
  padding-inline: 0;
}

.hero--tri-stack .hero-tri-frame {
  position: relative;
  width: 100%;
  padding-block: calc(var(--tri-band-height) + var(--tri-title-gap));
}

.hero--tri-stack .hero-tri-frame > .tri-layer {
  left: 0;
  width: 100%;
  transform: none;
}

.hero--tri-stack .hero-tri-frame > .tri-layer--upper {
  top: 0;
}

.hero--tri-stack .hero-tri-frame > .tri-layer--lower {
  top: auto;
  bottom: 0;
  transform: scaleX(-1) scaleY(-1);
  transform-origin: center center;
}

.hero--tri-stack .hero-brand {
  position: relative;
  z-index: 1;
  width: min(var(--wrap-max), calc(100% - (var(--page-inline) * 2)));
  margin-inline: auto;
  padding-inline: 0;
}

.hero--tri-stack .hero-copy {
  max-width: none;
  width: 100%;
}

.hero--tri-stack .hero-en {
  margin-bottom: 1rem;
}

.hero--tri-stack .lede {
  margin-bottom: 1.5rem;
}

.page-hero.tri-pattern > .tri-layer {
  top: 3.5rem; /* .page-hero padding-top と揃える */
}

.section.tri-pattern > .tri-layer {
  /* セクション見出しより一列分だけ上に帯を置く */
  top: calc(5rem - 2.5rem);
}

.tri-pattern > *:not(.tri-layer) {
  position: relative;
  z-index: 1;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-h);
  padding: 0 1.25rem;
  background: color-mix(in srgb, var(--white) 92%, transparent);
  border-bottom: 1px solid color-mix(in srgb, var(--blue) 22%, var(--white));
  backdrop-filter: blur(10px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  color: inherit;
  text-decoration: none;
}

.brand img {
  width: 2.4rem;
  height: 2.4rem;
  object-fit: contain;
}

.brand-name {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand-jp {
  font-size: 1.15rem;
  letter-spacing: 0.08em;
  color: var(--blue);
}

.brand-en {
  font-family: var(--font-en);
  font-size: 0.95rem;
  letter-spacing: 0.05em;
  color: var(--blue);
}

.nav-toggle {
  display: none;
  width: 2.6rem;
  height: 2.6rem;
  border: 1px solid var(--blue);
  background: var(--white);
  color: var(--blue);
  cursor: pointer;
}

.nav-toggle span,
.nav-toggle span::before,
.nav-toggle span::after {
  display: block;
  width: 1.1rem;
  height: 2px;
  margin: 0 auto;
  background: currentColor;
  position: relative;
}

.nav-toggle span::before,
.nav-toggle span::after {
  content: "";
  position: absolute;
  left: 0;
}

.nav-toggle span::before {
  top: -6px;
}

.nav-toggle span::after {
  top: 6px;
}

.site-nav ul {
  display: flex;
  gap: 1.4rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-nav a {
  color: var(--navy);
  text-decoration: none;
  font-size: 0.92rem;
  letter-spacing: 0.08em;
}

.site-nav a:hover,
.site-nav a[aria-current="location"] {
  color: var(--blue);
}

.hero {
  position: relative;
  min-height: calc(100svh - var(--header-h));
  display: grid;
  place-items: center;
  padding: 4rem 1.25rem 5rem;
  overflow: hidden;
}

.hero-copy {
  position: relative;
  z-index: 1;
  max-width: 44rem;
  text-align: center;
}

.kicker {
  display: inline-block;
  margin: 0 0 1rem;
  padding: 0.25rem 0.75rem;
  border: 1px solid var(--blue);
  color: var(--blue);
  font-family: var(--font-en);
  font-size: 0.92rem;
  letter-spacing: 0.14em;
}

.hero h1 {
  margin: 0 0 0.4rem;
  font-size: clamp(2.4rem, 7vw, 4.4rem);
  letter-spacing: 0.12em;
  line-height: 1.2;
  color: var(--blue);
}

.hero-en {
  margin: 0 0 1.4rem;
  font-family: var(--font-en);
  font-size: clamp(1.35rem, 3.2vw, 1.95rem);
  letter-spacing: 0.12em;
  color: var(--blue);
}

.lede {
  margin: 0 auto 2rem;
  max-width: 34rem;
  color: var(--navy);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.8rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 10rem;
  padding: 0.75rem 1.2rem;
  border: 1px solid var(--blue);
  text-decoration: none;
  letter-spacing: 0.08em;
}

.btn-primary {
  background: var(--blue);
  color: var(--white);
}

.btn-primary:hover {
  background: var(--navy);
  border-color: var(--navy);
  color: var(--white);
}

.btn-ghost {
  background: var(--white);
  color: var(--blue);
}

.btn-ghost:hover {
  background: var(--ice);
  color: var(--navy);
}

.hero-triangles {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.hero-triangles svg {
  width: 100%;
  height: 100%;
}

.section {
  padding: 5rem 1.25rem;
}

.section.tri-pattern {
  padding-inline: 0;
}

.section.tri-pattern > .wrap {
  width: min(var(--wrap-max), calc(100% - (var(--page-inline) * 2)));
  margin-inline: auto;
}

.wrap {
  width: min(var(--wrap-max), 100%);
  margin: 0 auto;
}

.section-head {
  margin-bottom: 2.4rem;
}

.section-head p {
  margin: 0.4rem 0 0;
  color: var(--blue);
  font-family: var(--font-en);
  letter-spacing: 0.12em;
  font-size: 1rem;
}

.section-head h2 {
  margin: 0;
  font-size: clamp(1.6rem, 3vw, 2.1rem);
  letter-spacing: 0.1em;
}

.sample-note {
  margin: 0 0 1.5rem;
  padding: 0.7rem 1rem;
  border-left: 3px solid var(--blue);
  background: var(--ice);
  font-size: 0.88rem;
}

.about-grid,
.product-grid,
.guide-grid,
.link-grid {
  display: grid;
  gap: 1.2rem;
}

.about-grid {
  grid-template-columns: 1.2fr 0.8fr;
}

.panel {
  padding: 1.6rem;
  background: var(--white);
  border: 1px solid color-mix(in srgb, var(--blue) 24%, var(--white));
}

.panel h3 {
  margin: 0 0 0.7rem;
  letter-spacing: 0.08em;
}

.panel p:last-child,
.panel ul:last-child {
  margin-bottom: 0;
}

.facts {
  margin: 0;
  padding: 0;
  list-style: none;
}

.facts li {
  display: grid;
  grid-template-columns: 6.5rem 1fr;
  gap: 0.6rem;
  padding: 0.65rem 0;
  border-bottom: 1px solid var(--ice);
}

.facts li:last-child {
  border-bottom: 0;
}

.facts dt,
.facts .label {
  color: var(--blue);
  letter-spacing: 0.08em;
}

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

.card {
  display: grid;
  grid-template-rows: auto 1fr;
  background: var(--white);
  border: 1px solid color-mix(in srgb, var(--blue) 24%, var(--white));
}

.card-visual {
  min-height: 10rem;
  display: grid;
  place-items: center;
  background: var(--ice);
}

.card-visual svg {
  width: 7.5rem;
  height: 7.5rem;
}

.card-body {
  padding: 1.3rem 1.4rem 1.5rem;
}

.tag {
  display: inline-block;
  margin-bottom: 0.5rem;
  color: var(--blue);
  font-family: var(--font-en);
  font-size: 0.9rem;
  letter-spacing: 0.1em;
}

.card h3,
.guide h3 {
  margin: 0 0 0.5rem;
  letter-spacing: 0.06em;
}

.card p,
.guide p {
  margin: 0;
}

.guide {
  padding: 1.5rem;
  background: var(--white);
  border: 1px solid color-mix(in srgb, var(--blue) 24%, var(--white));
}

.guide ol {
  margin: 0.8rem 0 0;
  padding-left: 1.2rem;
}

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

@media (min-width: 861px) {
  .link-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.link-card {
  display: block;
  padding: 1.4rem;
  background: var(--white);
  border: 1px solid color-mix(in srgb, var(--blue) 24%, var(--white));
  color: var(--navy);
  text-decoration: none;
}

.link-card:hover {
  border-color: var(--blue);
  color: var(--navy);
}

.link-card span {
  display: block;
  margin-top: 0.35rem;
  color: var(--blue);
  font-size: 0.85rem;
}

.site-footer {
  padding: 2rem 1.25rem 2.6rem;
  border-top: 1px solid color-mix(in srgb, var(--blue) 22%, var(--white));
  text-align: center;
}

.site-footer .brand-en {
  margin: 0.15rem 0 0;
}

.site-footer small {
  color: var(--blue);
}

.page-hero {
  padding: 3.5rem 1.25rem 3rem;
}

.page-hero.tri-pattern {
  padding-inline: 0;
}

.page-hero.tri-pattern > .wrap {
  width: min(var(--wrap-max), calc(100% - (var(--page-inline) * 2)));
}

.page-hero h1 {
  margin: 0.4rem 0 0.8rem;
  font-size: clamp(1.9rem, 4vw, 2.6rem);
  letter-spacing: 0.1em;
}

.page-hero .lede {
  margin: 0;
  max-width: 36rem;
}

.card-link {
  color: inherit;
  text-decoration: none;
  display: grid;
  grid-template-rows: auto 1fr;
  height: 100%;
}

.card-link:hover {
  color: inherit;
}

.card-link:hover .card-body h3 {
  color: var(--blue);
}

.card-visual img {
  width: 7.5rem;
  height: 7.5rem;
  object-fit: contain;
}

.section-more {
  margin: 2rem 0 0;
  text-align: center;
}

.event-grid {
  display: grid;
  gap: 1.2rem;
  grid-template-columns: repeat(2, 1fr);
}

.event-card h3 {
  margin: 0.5rem 0 0.8rem;
  letter-spacing: 0.06em;
}

.event-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
}

.event-meta time {
  color: var(--blue);
  font-size: 0.9rem;
  letter-spacing: 0.06em;
}

.event-note {
  margin: 0.8rem 0;
  font-size: 0.92rem;
}

.product-hero {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1.6rem;
  align-items: center;
}

.product-hero-visual {
  display: grid;
  place-items: center;
  width: 10rem;
  height: 10rem;
  background: var(--white);
  border: 1px solid color-mix(in srgb, var(--blue) 24%, var(--white));
}

.product-hero-visual img {
  width: 7rem;
  height: 7rem;
  object-fit: contain;
}

.meta-line {
  margin: 1rem 0 0;
  color: var(--blue);
  font-size: 0.85rem;
}

.narrow {
  width: min(760px, 100%);
}

.prose h3 {
  margin: 1.6rem 0 0.6rem;
  letter-spacing: 0.06em;
}

.prose p,
.prose ol,
.prose ul {
  margin: 0 0 1rem;
}

.prose-gallery {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin: 1rem 0 1.4rem;
}

.prose-gallery figure {
  margin: 0;
}

.prose-gallery img {
  width: 100%;
  height: auto;
  border: 1px solid color-mix(in srgb, var(--blue) 24%, var(--white));
  background: var(--ice);
}

.prose-gallery figcaption {
  margin-top: 0.4rem;
  color: var(--blue);
  font-size: 0.85rem;
  letter-spacing: 0.04em;
}

.prose .btn {
  margin: 0 0.5rem 0.6rem 0;
}

@media (max-width: 860px) {
  .prose-gallery {
    grid-template-columns: 1fr;
  }
}

.about-hero {
  display: flex;
  align-items: center;
  gap: 1.4rem;
}

.about-logo {
  width: 7.5rem;
  height: 7.5rem;
  object-fit: contain;
  background: var(--white);
  border: 1px solid color-mix(in srgb, var(--blue) 24%, var(--white));
  padding: 0.6rem;
}

.footer-grid {
  display: grid;
  gap: 1.2rem;
  grid-template-columns: 1.4fr 1fr 1fr;
  text-align: left;
  margin-bottom: 1.2rem;
}

.footer-brand {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
}

.footer-logo {
  width: 2.5rem;
  height: 2.5rem;
  object-fit: contain;
  flex-shrink: 0;
}

.footer-brand-text .brand-jp,
.footer-brand-text .brand-en,
.footer-brand-text .footer-tagline {
  margin: 0;
}

.footer-tagline {
  margin-top: 0.45rem;
  color: var(--blue);
}

.footer-nav,
.footer-links {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.footer-nav a,
.footer-links a {
  text-decoration: none;
  color: var(--navy);
}

.footer-nav a:hover,
.footer-links a:hover {
  color: var(--blue);
}

.footer-note {
  margin: 0;
  text-align: center;
}

.footer-credit {
  margin: 0.55rem 0 0;
  text-align: center;
  max-width: 42rem;
  margin-inline: auto;
  line-height: 1.6;
  color: color-mix(in srgb, var(--navy) 72%, var(--white));
}

.game-grid {
  display: grid;
  gap: 1.2rem;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.game-card {
  border: 1px solid color-mix(in srgb, var(--blue) 24%, var(--white));
  background: var(--white);
}

.game-card-body {
  padding: 1.2rem 1.3rem 1.4rem;
}

.game-card h3 {
  margin: 0 0 0.4rem;
  letter-spacing: 0.06em;
}

.game-meta {
  margin: 0 0 0.7rem;
  color: var(--blue);
  font-size: 0.9rem;
}

.upload-form {
  display: grid;
  gap: 1rem;
}

.upload-form label {
  display: grid;
  gap: 0.4rem;
}

.upload-form input[type="text"],
.upload-form input[type="password"],
.upload-form textarea,
.upload-form input[type="file"] {
  width: 100%;
  padding: 0.7rem 0.8rem;
  border: 1px solid color-mix(in srgb, var(--blue) 28%, var(--white));
  background: var(--white);
  color: var(--navy);
  font: inherit;
}

.game-id {
  margin: 0 0 0.8rem;
  font-size: 0.82rem;
  color: color-mix(in srgb, var(--navy) 55%, var(--white));
  word-break: break-all;
}

.game-delete-panel {
  display: grid;
  gap: 0.7rem;
  margin-top: 0.9rem;
  padding-top: 0.9rem;
  border-top: 1px solid color-mix(in srgb, var(--blue) 18%, var(--white));
}

.game-delete-panel label {
  display: grid;
  gap: 0.35rem;
  font-size: 0.9rem;
}

.game-delete-panel input {
  width: 100%;
  padding: 0.55rem 0.7rem;
  border: 1px solid color-mix(in srgb, var(--blue) 28%, var(--white));
  background: var(--white);
  color: var(--navy);
  font: inherit;
}

.upload-agree {
  grid-template-columns: auto 1fr;
  align-items: start;
  gap: 0.7rem;
}

.upload-agree input {
  margin-top: 0.25rem;
}

.upload-status {
  margin: 0;
  color: var(--blue);
  min-height: 1.5em;
}

.upload-result {
  padding: 0.8rem 1rem;
  border: 2px solid var(--blue);
  background: var(--white);
  color: var(--navy);
}

.upload-result p {
  margin: 0 0 0.5rem;
  font-weight: 700;
}

.upload-result dl {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.3rem 0.8rem;
  margin: 0;
}

.upload-result dd {
  margin: 0;
  word-break: break-all;
}

.upload-result code {
  font-size: 1rem;
  user-select: all;
}

@media (max-width: 860px) {
  .game-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 860px) {
  :root {
    --page-inline: 1rem;
    --header-h: 4rem;
    --tri-rows: 5;
  }

  .site-header {
    padding: 0 var(--page-inline);
  }

  .brand {
    gap: 0.55rem;
    min-width: 0;
  }

  .brand img {
    width: 2.1rem;
    height: 2.1rem;
    flex-shrink: 0;
  }

  .brand-jp {
    font-size: 1.05rem;
  }

  .brand-en {
    font-size: 0.78rem;
  }

  .about-grid,
  .product-grid,
  .guide-grid,
  .link-grid,
  .event-grid,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .product-hero,
  .about-hero {
    grid-template-columns: 1fr;
    flex-direction: column;
    align-items: flex-start;
  }

  .product-hero {
    justify-items: center;
    text-align: center;
  }

  .product-hero .meta-line,
  .product-hero .actions {
    justify-content: center;
  }

  .nav-toggle {
    display: grid;
    place-items: center;
    flex-shrink: 0;
  }

  .site-nav {
    display: none;
    position: absolute;
    top: var(--header-h);
    right: 0;
    left: 0;
    z-index: 50;
    background: color-mix(in srgb, var(--white) 96%, transparent);
    border-bottom: 1px solid color-mix(in srgb, var(--blue) 22%, var(--white));
    backdrop-filter: blur(10px);
  }

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

  .site-nav ul {
    flex-direction: column;
    gap: 0;
    padding: 0.4rem 0 0.8rem;
  }

  .site-nav a {
    display: block;
    padding: 0.85rem var(--page-inline);
    font-size: 1rem;
  }

  .hero {
    min-height: 0;
    padding: 2.25rem 0 2.75rem;
  }

  .hero--tri-stack {
    --tri-title-gap: 0.55rem;
  }

  .hero--tri-stack .hero-en {
    margin-bottom: 0.75rem;
  }

  .hero--tri-stack .lede {
    margin-bottom: 1.15rem;
    font-size: 0.95rem;
    line-height: 1.7;
  }

  .kicker {
    margin-bottom: 0.75rem;
    padding: 0.2rem 0.55rem;
    font-size: 0.72rem;
    letter-spacing: 0.08em;
  }

  .hero h1 {
    font-size: clamp(2.05rem, 11vw, 3.1rem);
    letter-spacing: 0.08em;
  }

  .hero-en {
    margin-bottom: 1rem;
    font-size: clamp(0.95rem, 4.2vw, 1.25rem);
    letter-spacing: 0.05em;
  }

  .actions {
    flex-direction: column;
    align-items: stretch;
    gap: 0.65rem;
    width: min(20rem, 100%);
    margin-inline: auto;
  }

  .btn {
    min-width: 0;
    width: 100%;
    padding: 0.85rem 1rem;
  }

  .section {
    padding: 3.25rem var(--page-inline);
  }

  .section.tri-pattern {
    padding-inline: 0;
  }

  .section.tri-pattern > .tri-layer {
    top: calc(3.25rem - 2rem);
  }

  .section-head {
    margin-bottom: 1.6rem;
  }

  .section-head h2 {
    font-size: clamp(1.45rem, 5.5vw, 1.85rem);
  }

  .page-hero {
    padding: 2.5rem var(--page-inline) 2rem;
  }

  .page-hero.tri-pattern {
    padding-inline: 0;
  }

  .page-hero.tri-pattern > .tri-layer {
    top: 2.5rem;
  }

  .page-hero h1 {
    font-size: clamp(1.7rem, 7vw, 2.2rem);
  }

  .card-body {
    padding: 1.15rem 1.15rem 1.3rem;
  }

  .card-visual {
    min-height: 8.5rem;
  }

  .link-card {
    padding: 1.15rem;
  }

  .event-meta {
    flex-wrap: wrap;
  }

  .facts li {
    grid-template-columns: 5.5rem 1fr;
    gap: 0.45rem;
  }

  .footer-grid {
    text-align: left;
    gap: 1.5rem;
  }

  .site-footer {
    padding: 1.75rem var(--page-inline) 2.2rem;
  }
}

@media (max-width: 480px) {
  :root {
    --tri-rows: 4;
    --header-h: 3.75rem;
  }

  .site-header .brand-en {
    display: none;
  }

  .hero--tri-stack {
    --tri-title-gap: 0.45rem;
  }

  .hero {
    padding: 1.75rem 0 2.25rem;
  }

  .lede {
    font-size: 0.92rem;
  }

  .section {
    padding-block: 2.75rem;
  }

  .section.tri-pattern > .tri-layer {
    top: calc(2.75rem - 1.75rem);
  }
}