:root {
  color-scheme: dark;
  --bg: #060914;
  --surface: rgba(17, 24, 43, 0.84);
  --text: #f4f7ff;
  --muted: #b8c2d9;
  --line: rgba(180, 199, 240, 0.18);
  --accent-strong: #b6d5ff;
  --sun: #ffd784;
  --moon: #dce7ff;
  --shadow: 0 24px 70px rgba(0, 0, 0, 0.34);
  --radius: 22px;
  --content: 1120px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  min-height: 100vh;
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at 18% 0%, rgba(70, 110, 180, 0.19), transparent 32rem),
    radial-gradient(circle at 86% 14%, rgba(159, 113, 67, 0.12), transparent 28rem),
    var(--bg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans",
    "Yu Gothic UI", "Noto Sans JP", sans-serif;
  font-size: 17px;
  line-height: 1.72;
  text-rendering: optimizeLegibility;
}

a {
  color: var(--accent-strong);
  text-underline-offset: 0.2em;
}

a:hover { color: #ffffff; }

a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--sun);
  outline-offset: 4px;
  border-radius: 6px;
}

.skip-link {
  position: absolute;
  z-index: 20;
  top: 10px;
  inset-inline-start: 10px;
  padding: 0.7rem 1rem;
  color: #07101f;
  background: #ffffff;
  border-radius: 10px;
  transform: translateY(-150%);
}

.skip-link:focus { transform: translateY(0); }

.site-header {
  position: relative;
  z-index: 5;
  border-bottom: 1px solid var(--line);
  background: rgba(6, 9, 20, 0.82);
  backdrop-filter: blur(18px);
}

.header-inner,
.page-shell,
.footer-inner {
  width: min(calc(100% - 2rem), var(--content));
  margin-inline: auto;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 74px;
  gap: 1.5rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--text);
  font-weight: 700;
  line-height: 1.25;
  text-decoration: none;
}

.brand-mark {
  position: relative;
  width: 34px;
  height: 34px;
  flex: 0 0 34px;
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 50%;
  background: var(--moon);
  box-shadow: inset -11px 0 0 #10182b, 0 0 24px rgba(134, 185, 255, 0.25);
}

.brand-mark::after {
  content: "";
  position: absolute;
  top: 15px;
  left: -5px;
  width: 44px;
  height: 1px;
  background: rgba(255, 215, 132, 0.72);
  transform: rotate(-16deg);
}

.nav-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: 0.3rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav-list a {
  display: inline-block;
  padding: 0.55rem 0.7rem;
  color: var(--muted);
  font-size: 0.91rem;
  text-decoration: none;
}

.nav-list a:hover,
.nav-list a[aria-current="page"] { color: var(--text); }

.language-link {
  border: 1px solid var(--line);
  border-radius: 999px;
}

.language-picker {
  position: relative;
  flex: 0 0 auto;
}

.language-picker summary {
  min-height: 44px;
  padding: 0.55rem 0.8rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.035);
  font-size: 0.91rem;
  cursor: pointer;
}

.language-picker summary:hover,
.language-picker[open] summary { color: var(--text); }

.language-picker summary:focus-visible {
  outline: 3px solid var(--sun);
  outline-offset: 4px;
}

.language-options {
  position: absolute;
  z-index: 10;
  inset-block-start: calc(100% + 0.55rem);
  inset-inline-end: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(11rem, 1fr));
  width: min(34rem, calc(100vw - 2rem));
  max-height: min(70vh, 34rem);
  margin: 0;
  padding: 0.65rem;
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(6, 9, 20, 0.98);
  box-shadow: var(--shadow);
  list-style: none;
}

.language-options a {
  display: block;
  min-height: 42px;
  padding: 0.5rem 0.65rem;
  border-radius: 9px;
  color: var(--muted);
  text-decoration: none;
}

.language-options a:hover,
.language-options a[aria-current="page"] {
  color: var(--text);
  background: rgba(255, 255, 255, 0.08);
}

.not-found-languages {
  margin-top: 2rem;
}

.not-found-languages .language-options {
  position: static;
  margin-top: 0.75rem;
}

bdi,
.content-page a { overflow-wrap: anywhere; }

.page-shell { padding-block: 4.5rem 5.5rem; }

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(280px, 0.8fr);
  align-items: center;
  gap: clamp(2rem, 6vw, 5.5rem);
  min-height: 580px;
}

.eyebrow {
  margin: 0 0 0.9rem;
  color: var(--sun);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1, h2, h3 {
  margin-top: 0;
  line-height: 1.25;
  letter-spacing: -0.025em;
  text-wrap: balance;
  text-wrap-style: balance;
}

h1 {
  max-width: 15ch;
  margin-bottom: 1.25rem;
  font-size: clamp(2.55rem, 6vw, 5rem);
}

.content-page h1 {
  max-width: 20ch;
  font-size: clamp(2.35rem, 5vw, 4.2rem);
}

h2 {
  margin-top: 3.4rem;
  margin-bottom: 1rem;
  font-size: clamp(1.65rem, 3vw, 2.25rem);
}

h3 {
  margin-top: 2rem;
  margin-bottom: 0.45rem;
  font-size: 1.18rem;
}

.lede {
  max-width: 42rem;
  color: var(--muted);
  font-size: clamp(1.08rem, 2vw, 1.28rem);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 2rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0.75rem 1.15rem;
  border: 1px solid var(--line);
  border-radius: 12px;
  color: var(--text);
  background: rgba(255, 255, 255, 0.04);
  font-weight: 650;
  text-decoration: none;
}

.button.primary {
  color: #07101f;
  background: var(--accent-strong);
  border-color: transparent;
}

.button:hover {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.1);
}

.button.primary:hover {
  color: #07101f;
  background: #ffffff;
}

.orbit-panel {
  position: relative;
  min-height: 390px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 32px;
  background: linear-gradient(145deg, rgba(33, 47, 78, 0.65), rgba(7, 11, 23, 0.88));
  box-shadow: var(--shadow);
}

.orbit,
.orbit::before,
.orbit::after {
  position: absolute;
  border: 1px solid rgba(182, 213, 255, 0.25);
  border-radius: 50%;
}

.orbit {
  inset: 52px -85px;
  transform: rotate(-17deg);
}

.orbit::before,
.orbit::after {
  content: "";
  inset: 48px;
}

.orbit::after { inset: 105px; }

.celestial-body {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 126px;
  height: 126px;
  border-radius: 50%;
  background: radial-gradient(circle at 34% 30%, #ffffff, var(--moon) 28%, #8390aa 74%);
  box-shadow: -34px 8px 0 3px #0b1121, 0 0 48px rgba(134, 185, 255, 0.3);
  transform: translate(-50%, -50%);
}

.orbit-caption {
  position: absolute;
  right: 1.4rem;
  bottom: 1.2rem;
  left: 1.4rem;
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: 14px;
  color: var(--muted);
  background: rgba(5, 8, 17, 0.72);
  font-size: 0.9rem;
}

.section-intro {
  max-width: 48rem;
  margin-bottom: 2rem;
  color: var(--muted);
}

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

.card {
  padding: 1.55rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: 0 14px 35px rgba(0, 0, 0, 0.16);
}

.card h3 { margin-top: 0; }

.card p:last-child {
  margin-bottom: 0;
  color: var(--muted);
}

.notice {
  margin-top: 2.5rem;
  padding: 1.35rem 1.5rem;
  border-inline-start: 4px solid var(--sun);
  border-radius: 16px;
  background: rgba(255, 215, 132, 0.08);
}

.content-page { max-width: 820px; }

.content-page > header {
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--line);
}

.content-page p,
.content-page li { color: #d9e0ef; }

.content-page ul,
.content-page ol { padding-inline-start: 1.4rem; }

.meta {
  color: var(--muted);
  font-size: 0.92rem;
}

.contact-panel {
  margin-block: 2rem;
  padding: 1.6rem;
  border: 1px solid rgba(134, 185, 255, 0.32);
  border-radius: var(--radius);
  background: linear-gradient(145deg, rgba(54, 89, 145, 0.19), rgba(17, 24, 43, 0.72));
}

.contact-panel h2 { margin-top: 0; }

.faq-item {
  padding-block: 0.8rem 1.35rem;
  border-bottom: 1px solid var(--line);
}

.faq-item:last-child { border-bottom: 0; }

.site-footer {
  border-top: 1px solid var(--line);
  background: rgba(3, 5, 12, 0.6);
}

.footer-inner {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 2rem;
  padding-block: 2rem 2.8rem;
  color: var(--muted);
  font-size: 0.88rem;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 1rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

@media (max-width: 860px) {
  .header-inner,
  .footer-inner {
    align-items: flex-start;
    flex-direction: column;
    padding-block: 1rem;
  }

  .nav-list { justify-content: flex-start; }

  .language-picker { width: 100%; }

  .language-options {
    inset-inline: 0 auto;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
  }

  .orbit-panel { min-height: 320px; }

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

  .footer-links { justify-content: flex-start; }
}

@media (max-width: 560px) {
  body { font-size: 16px; }

  .page-shell { padding-block: 3rem 4rem; }

  .nav-list a { padding-inline: 0.45rem; }

  .language-options { grid-template-columns: 1fr; }

  .orbit-panel { min-height: 270px; }
}

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

@media (prefers-contrast: more) {
  :root {
    --muted: #e5ebf7;
    --line: rgba(255, 255, 255, 0.48);
  }
}