:root {
  --blue-950: #00275c;
  --blue-900: #003b83;
  --blue-800: #004ea8;
  --blue-700: #1e6ad4;
  --blue-100: #d6e4f5;
  --blue-50: #eef4fb;
  --bg: #fff;
  --paper: #fff;
  --ink: #1a1d24;
  --ink-muted: #5a6270;
  --line: #e2e6ee;
  --soon-bg: #f5f6f8;
  --soon-ink: #6b727c;
  --radius: 16px;
  --shadow: 0 10px 30px rgba(0, 59, 131, 0.08);
  --header-h: 4.25rem;
  --font: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP",
    "Yu Gothic Medium", YuGothic, Meiryo, sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--ink);
  background: var(--bg);
  min-height: 100vh;
}

a {
  color: var(--blue-800);
}

a:hover {
  color: var(--blue-950);
}

:focus-visible {
  outline: 3px solid var(--blue-700);
  outline-offset: 3px;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -4rem;
  z-index: 100;
  padding: 0.6rem 1rem;
  background: var(--blue-800);
  color: #fff;
  text-decoration: none;
  border-radius: 8px;
}

.skip-link:focus {
  top: 1rem;
}

.wrap {
  width: min(1080px, calc(100% - 2rem));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--blue-50);
  border-bottom: 3px solid var(--blue-900);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--header-h);
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: inherit;
}

.brand:hover {
  color: inherit;
}

.brand__mark {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
}

.brand__name {
  display: block;
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1.2;
}

.brand__en {
  display: block;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--ink-muted);
  letter-spacing: 0.08em;
}

.nav a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 0.25rem;
  text-decoration: none;
  font-weight: 600;
  color: var(--ink);
}

.nav a:hover {
  color: var(--blue-800);
}

.hero {
  padding: 4.5rem 0 3rem;
}

.hero__kicker {
  margin: 0 0 1rem;
  color: var(--blue-800);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.18em;
}

.hero h1 {
  margin: 0 0 1rem;
  font-size: clamp(2rem, 5vw, 3.25rem);
  line-height: 1.25;
  letter-spacing: 0.02em;
  font-weight: 800;
}

.hero p {
  margin: 0;
  max-width: 34em;
  color: var(--ink-muted);
  font-size: 1.05rem;
}

.section {
  padding: 1rem 0 4rem;
}

.section h2 {
  margin: 0 0 1.5rem;
  font-size: 1.35rem;
  letter-spacing: 0.06em;
}

.cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

@media (min-width: 760px) {
  .cards {
    grid-template-columns: 1fr 1fr;
    align-items: stretch;
  }
}

.card {
  display: flex;
  flex-direction: column;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.5rem 1.5rem 1.35rem;
  box-shadow: var(--shadow);
  min-width: 0;
}

.card--soon {
  background: var(--soon-bg);
  box-shadow: none;
}

.card__top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.card__icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  background: var(--blue-50);
  color: var(--blue-800);
}

.card--soon .card__icon {
  background: #eceff3;
  color: var(--soon-ink);
}

.badge {
  display: inline-block;
  padding: 0.2rem 0.65rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1.6;
}

.badge--public {
  background: var(--blue-50);
  color: var(--blue-900);
  border: 1px solid var(--blue-100);
}

.badge--soon {
  background: #eceff3;
  color: #4f555e;
  border: 1px solid #d8dde4;
}

.card h3 {
  margin: 0 0 0.2rem;
  font-size: 1.25rem;
  line-height: 1.4;
}

.card__en {
  margin: 0 0 0.75rem;
  color: var(--ink-muted);
  font-size: 0.85rem;
}

.card__host {
  margin: 0 0 0.85rem;
  font-size: 0.9rem;
  color: var(--blue-800);
  word-break: break-all;
}

.card--soon .card__host {
  color: var(--soon-ink);
}

.card p {
  margin: 0 0 1rem;
  color: var(--ink-muted);
  flex: 1;
}

.card__audience {
  margin: 0 0 1.15rem;
  font-size: 0.9rem;
  color: var(--ink);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  min-height: 48px;
  padding: 0.7rem 1.15rem;
  border-radius: 999px;
  background: var(--blue-900);
  color: #fff;
  font-weight: 700;
  text-decoration: none;
  align-self: flex-start;
}

.btn:hover {
  background: var(--blue-950);
  color: #fff;
}

.btn svg {
  width: 18px;
  height: 18px;
}

.note {
  margin: 0;
  padding: 1.5rem 0 3.5rem;
  color: var(--ink-muted);
}

.note strong {
  color: var(--ink);
  font-weight: 700;
}

.site-footer {
  border-top: none;
  background: var(--blue-900);
  color: #fff;
  padding: 2.5rem 0 2rem;
}

.site-footer__inner {
  display: grid;
  gap: 1.5rem;
}

@media (min-width: 700px) {
  .site-footer__inner {
    grid-template-columns: 1.4fr 1fr 1fr;
  }
}

.footer-name {
  margin: 0;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.footer-en {
  margin: 0.2rem 0 0;
  font-size: 0.75rem;
  color: #c5d8f0;
  letter-spacing: 0.08em;
}

.site-footer h2 {
  margin: 0 0 0.6rem;
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  color: #c5d8f0;
}

.site-footer ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-footer li + li {
  margin-top: 0.35rem;
}

.site-footer a {
  text-decoration: none;
  color: #fff;
}

.site-footer a:hover {
  color: #d6e4f5;
  text-decoration: underline;
}

.copyright {
  margin: 2rem 0 0;
  padding-top: 1.25rem;
  border-top: 1px solid rgba(255, 255, 255, 0.2);
  color: #c5d8f0;
  font-size: 0.9rem;
}

.prose {
  max-width: 42rem;
  padding: 3rem 0 4.5rem;
}

.prose h1 {
  margin: 0 0 0.4rem;
  font-size: clamp(1.7rem, 4vw, 2.2rem);
}

.prose .lede {
  margin: 0 0 2rem;
  color: var(--ink-muted);
}

.prose h2 {
  margin: 2rem 0 0.7rem;
  font-size: 1.15rem;
}

.prose ul {
  padding-left: 1.2rem;
}

.updated {
  margin-top: 2.5rem;
  color: var(--ink-muted);
  font-size: 0.9rem;
}

.error {
  min-height: calc(100vh - 14rem);
  display: grid;
  align-content: center;
  padding: 4rem 0;
}

.error p {
  color: var(--ink-muted);
}