:root {
  --void: #0a0a0f;
  --night: #111217;
  --paper: #e8e3d8;
  --silver: #c9d1d9;
  --copper: #8b7355;
  --brass: #d4a574;
  --line: rgba(232, 227, 216, 0.16);
  --glow: rgba(212, 165, 116, 0.25);
  --content-max: 1120px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: "Noto Sans JP", sans-serif;
  color: var(--paper);
  background: radial-gradient(circle at 18% -10%, #1f212a 0%, transparent 42%),
    radial-gradient(circle at 85% 10%, #1a1b23 0%, transparent 32%),
    linear-gradient(180deg, #0a0a0f 0%, #08080b 100%);
  line-height: 1.8;
  letter-spacing: 0.02em;
  min-height: 100vh;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.14;
  background-image: repeating-linear-gradient(
      to right,
      rgba(255, 255, 255, 0.03) 0,
      rgba(255, 255, 255, 0.03) 1px,
      transparent 1px,
      transparent 60px
    ),
    repeating-linear-gradient(
      to bottom,
      rgba(255, 255, 255, 0.025) 0,
      rgba(255, 255, 255, 0.025) 1px,
      transparent 1px,
      transparent 44px
    );
  z-index: -1;
}

a {
  color: inherit;
}

.wrap {
  width: min(var(--content-max), calc(100% - 40px));
  margin: 0 auto;
}

.site-nav {
  position: sticky;
  top: 0;
  z-index: 30;
  backdrop-filter: blur(8px);
  background: rgba(10, 10, 15, 0.58);
  border-bottom: 1px solid var(--line);
}

.site-nav-inner {
  width: min(var(--content-max), calc(100% - 40px));
  margin: 0 auto;
  min-height: 64px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 18px;
}

.brand {
  font-family: "IBM Plex Mono", monospace;
  font-size: 13px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--silver);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 14px;
  color: rgba(232, 227, 216, 0.9);
}

.nav-links a {
  text-decoration: none;
  opacity: 0.84;
  transition: opacity 0.25s ease, color 0.25s ease;
}

.nav-links a:hover {
  opacity: 1;
  color: var(--brass);
}

.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: "IBM Plex Mono", monospace;
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(201, 209, 217, 0.92);
}

.lang-switch span {
  opacity: 0.45;
}

.lang-switch a {
  text-decoration: none;
  opacity: 0.72;
  transition: opacity 0.25s ease, color 0.25s ease;
}

.lang-switch a:hover {
  opacity: 1;
  color: var(--brass);
}

.lang-switch a[aria-current="true"] {
  opacity: 1;
  color: var(--brass);
}

.hero {
  min-height: calc(100vh - 96px);
  margin: 12px;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: radial-gradient(circle at 16% 0%, rgba(42, 48, 72, 0.3) 0%, transparent 42%),
    radial-gradient(circle at 78% 18%, rgba(30, 33, 47, 0.32) 0%, transparent 36%),
    rgba(8, 9, 13, 0.72);
}

.hero-grid {
  display: grid;
  grid-template-columns: 2.9fr 2.1fr;
  gap: 52px;
  align-items: center;
  width: 100%;
  padding: 72px 24px;
}

.hero h1 {
  margin: 0;
  font-family: "Shippori Mincho B1", serif;
  font-weight: 800;
  font-size: clamp(2.3rem, 6.4vw, 5rem);
  line-height: 1.2;
  letter-spacing: 0.01em;
}

.hero h1 .app {
  display: block;
  margin-top: 0.4em;
  font-family: "IBM Plex Mono", monospace;
  font-size: clamp(1rem, 2.15vw, 1.38rem);
  letter-spacing: 0.24em;
  color: var(--silver);
}

.accent {
  font-family: "Playfair Display", serif;
  font-style: italic;
  font-size: 0.92rem;
  color: var(--silver);
  opacity: 0.8;
  margin: 18px 0 0;
}

.hero-copy {
  margin: 22px 0 0;
  max-width: 39ch;
  font-size: 1rem;
  color: rgba(232, 227, 216, 0.88);
}

.hero-actions {
  margin-top: 34px;
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.btn {
  appearance: none;
  border: 1px solid transparent;
  background: transparent;
  color: var(--paper);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 18px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.04em;
  transition: transform 0.25s ease, border-color 0.25s ease, background 0.25s ease,
    color 0.25s ease, box-shadow 0.25s ease;
}

.btn-primary {
  border-color: rgba(212, 165, 116, 0.5);
  background: rgba(212, 165, 116, 0.11);
  box-shadow: 0 0 0 1px rgba(212, 165, 116, 0.2) inset;
}

.btn-secondary {
  border-color: var(--line);
  background: rgba(255, 255, 255, 0.02);
}

.btn:hover {
  transform: translateY(-2px);
  color: var(--brass);
  border-color: rgba(212, 165, 116, 0.72);
  box-shadow: 0 10px 22px rgba(0, 0, 0, 0.26);
}

.hero-art {
  position: relative;
  justify-self: end;
  width: min(420px, 100%);
  aspect-ratio: 3 / 4;
  border-radius: 34px;
  border: 1px solid var(--line);
  background: linear-gradient(170deg, rgba(255, 255, 255, 0.03) 0%, rgba(255, 255, 255, 0.01) 100%);
  overflow: hidden;
  box-shadow: 0 34px 70px rgba(0, 0, 0, 0.45);
}

.hero-art::before {
  content: "";
  position: absolute;
  width: 42%;
  height: 42%;
  top: -8%;
  right: -8%;
  border-radius: 50%;
  background: radial-gradient(circle, var(--glow) 0%, transparent 70%);
  filter: blur(2px);
}

.hero-art img {
  position: absolute;
  inset: 22px;
  width: calc(100% - 44px);
  height: calc(100% - 44px);
  object-fit: cover;
  border-radius: 24px;
}

.hero-chip {
  position: absolute;
  bottom: 16px;
  left: 16px;
  font-family: "IBM Plex Mono", monospace;
  font-size: 11px;
  background: rgba(10, 10, 15, 0.7);
  border: 1px solid rgba(232, 227, 216, 0.28);
  border-radius: 999px;
  padding: 6px 10px;
  letter-spacing: 0.08em;
}

section {
  padding: 110px 0;
}

.kicker {
  margin: 0;
  font-family: "IBM Plex Mono", monospace;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 11px;
  color: rgba(201, 209, 217, 0.88);
}

h2 {
  margin: 12px 0 0;
  font-family: "Shippori Mincho B1", serif;
  font-size: clamp(1.75rem, 4vw, 3rem);
  line-height: 1.3;
}

.lead {
  margin: 16px 0 0;
  max-width: 64ch;
  color: rgba(232, 227, 216, 0.88);
}

.grid-60-40 {
  display: grid;
  grid-template-columns: 3fr 2fr;
  gap: 48px;
}

.panel {
  border: 1px solid var(--line);
  border-radius: 24px;
  padding: 26px;
  background: linear-gradient(160deg, rgba(255, 255, 255, 0.025) 0%, rgba(255, 255, 255, 0.006) 100%);
}

.steps {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.steps li {
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 14px 16px;
  background: rgba(255, 255, 255, 0.01);
}

.steps strong {
  display: block;
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-family: "IBM Plex Mono", monospace;
  margin-bottom: 5px;
  color: var(--silver);
}

.artifact-box {
  border: 1px solid var(--line);
  border-radius: 28px;
  padding: 18px;
  background: rgba(12, 13, 17, 0.72);
  box-shadow: 0 24px 55px rgba(0, 0, 0, 0.35);
}

.artifact-box img {
  width: 100%;
  border-radius: 20px;
  display: block;
}

.meta-grid {
  margin-top: 14px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.meta {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 9px 10px;
}

.meta .label {
  display: block;
  font-size: 10px;
  color: var(--silver);
  font-family: "IBM Plex Mono", monospace;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.meta .value {
  display: block;
  margin-top: 4px;
  font-size: 13px;
}

.privacy-list {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.privacy-list li {
  border-left: 2px solid rgba(212, 165, 116, 0.5);
  padding: 7px 0 7px 12px;
}

.cta-wrap {
  border: 1px solid rgba(212, 165, 116, 0.5);
  border-radius: 28px;
  padding: 38px;
  background: radial-gradient(circle at 50% 0%, rgba(212, 165, 116, 0.15), rgba(0, 0, 0, 0) 58%),
    rgba(12, 13, 17, 0.76);
}

.cta-wrap p {
  margin: 14px 0 0;
  color: rgba(232, 227, 216, 0.9);
}

.footer {
  padding: 42px 0 60px;
  border-top: 1px solid var(--line);
}

.footer-inner {
  width: min(var(--content-max), calc(100% - 40px));
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
  color: rgba(201, 209, 217, 0.9);
  font-size: 12px;
}

.footer .mono {
  font-family: "IBM Plex Mono", monospace;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.footer a {
  color: var(--paper);
  text-decoration: none;
  border-bottom: 1px solid rgba(232, 227, 216, 0.32);
  transition: color 0.25s ease, border-color 0.25s ease;
}

.footer a:hover {
  color: var(--brass);
  border-color: rgba(212, 165, 116, 0.72);
}

.reveal {
  opacity: 0;
  transform: translateY(36px);
  transition: opacity 0.8s cubic-bezier(0.2, 0.9, 0.3, 1),
    transform 0.8s cubic-bezier(0.2, 0.9, 0.3, 1);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

.support-main {
  padding: 72px 0 110px;
}

.support-hero {
  margin-bottom: 34px;
}

.faq-grid {
  display: grid;
  gap: 12px;
  margin-top: 18px;
}

.faq-item {
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 16px;
  background: rgba(255, 255, 255, 0.01);
}

.faq-item h3 {
  margin: 0;
  font-size: 15px;
}

.faq-item p {
  margin: 10px 0 0;
  color: rgba(232, 227, 216, 0.88);
}

.contact-card {
  margin-top: 26px;
  border: 1px solid rgba(212, 165, 116, 0.46);
  border-radius: 16px;
  padding: 16px;
  background: rgba(212, 165, 116, 0.08);
}

.contact-card a {
  color: var(--paper);
  text-decoration: none;
  border-bottom: 1px solid rgba(232, 227, 216, 0.4);
}

.contact-card a:hover {
  color: var(--brass);
  border-color: rgba(212, 165, 116, 0.8);
}

@media (max-width: 900px) {
  .hero-grid,
  .grid-60-40 {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .hero-art {
    justify-self: start;
    width: min(420px, 100%);
  }

  section {
    padding: 82px 0;
  }

  .cta-wrap {
    padding: 28px;
  }
}

@media (max-width: 600px) {
  .site-nav-inner,
  .wrap,
  .footer-inner {
    width: calc(100% - 28px);
  }

  .site-nav-inner {
    min-height: 58px;
    gap: 10px;
  }

  .hero {
    min-height: calc(100vh - 80px);
    margin: 8px;
    border-radius: 18px;
  }

  .hero-grid {
    padding: 52px 12px 44px;
  }

  .hero-copy,
  .lead {
    font-size: 0.95rem;
  }

  .hero-actions {
    margin-top: 28px;
  }

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

  .nav-links {
    gap: 10px;
    font-size: 12px;
  }

  .lang-switch {
    gap: 6px;
    font-size: 11px;
  }
}