:root {
  --bg: #0b1220;
  --bg-elev: #121a2b;
  --bg-card: #162036;
  --line: #24324a;
  --text: #e8eef8;
  --muted: #9aadc6;
  --accent: #3aa7ff;
  --accent-soft: rgba(58, 167, 255, 0.14);
  --accent-strong: #1f8de6;
  --ok: #3ecf8e;
  --danger: #ff6b7a;
  --radius: 14px;
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.35);
  --font: "Noto Sans JP", "Segoe UI", system-ui, -apple-system, sans-serif;
  --max: 1080px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  color: var(--text);
  background:
    radial-gradient(1200px 600px at 80% -10%, rgba(58, 167, 255, 0.16), transparent 55%),
    radial-gradient(900px 500px at -10% 20%, rgba(58, 167, 255, 0.08), transparent 50%),
    linear-gradient(180deg, #0b1220 0%, #0d1526 100%);
  min-height: 100vh;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(36, 50, 74, 0.35) 1px, transparent 1px),
    linear-gradient(90deg, rgba(36, 50, 74, 0.35) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: linear-gradient(180deg, rgba(0,0,0,0.45), transparent 70%);
  z-index: 0;
}

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

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

.wrap {
  width: min(100% - 2rem, var(--max));
  margin-inline: auto;
  position: relative;
  z-index: 1;
}

/* Nav */
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.1rem 0;
  gap: 1rem;
}

.wordmark {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  color: var(--text);
  text-decoration: none;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.mark {
  width: 34px;
  height: 34px;
  border-radius: 9px;
  background: linear-gradient(145deg, #163154, #0f1b30);
  border: 1px solid #2a4568;
  display: grid;
  place-items: center;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 800;
}

.lang-toggle {
  display: inline-flex;
  border: 1px solid var(--line);
  border-radius: 999px;
  overflow: hidden;
  background: rgba(18, 26, 43, 0.8);
}

.lang-toggle button {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.45rem 0.85rem;
  cursor: pointer;
}

.lang-toggle button[aria-pressed="true"] {
  background: var(--accent-soft);
  color: var(--text);
}

.lang-toggle button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: -2px;
}

/* Hero */
.hero {
  padding: 2.2rem 0 1.5rem;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  border: 1px solid rgba(58, 167, 255, 0.35);
  background: var(--accent-soft);
  color: #cfe8ff;
  font-size: 0.82rem;
  font-weight: 600;
  margin-bottom: 1.1rem;
}

.badge::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px rgba(58, 167, 255, 0.18);
}

h1 {
  margin: 0 0 1rem;
  font-size: clamp(1.85rem, 4.6vw, 2.85rem);
  line-height: 1.25;
  letter-spacing: -0.02em;
  font-weight: 800;
  max-width: 18ch;
}

.lead {
  margin: 0 0 1.6rem;
  color: var(--muted);
  font-size: clamp(1rem, 2.2vw, 1.15rem);
  max-width: 42rem;
}

.hero-grid {
  display: grid;
  gap: 1.5rem;
}

@media (min-width: 860px) {
  .hero-grid {
    grid-template-columns: 1.15fr 0.85fr;
    align-items: start;
  }
  h1 {
    max-width: none;
  }
}

.panel {
  background: linear-gradient(180deg, rgba(22, 32, 54, 0.95), rgba(18, 26, 43, 0.95));
  border: 1px solid var(--line);
  border-radius: calc(var(--radius) + 4px);
  box-shadow: var(--shadow);
  padding: 1.25rem;
}

.panel h2 {
  margin: 0 0 0.35rem;
  font-size: 1.05rem;
}

.panel .hint {
  margin: 0 0 1rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.waitlist-form {
  display: grid;
  gap: 0.75rem;
}

label {
  display: grid;
  gap: 0.35rem;
  font-size: 0.9rem;
  font-weight: 600;
}

input[type="email"] {
  width: 100%;
  border: 1px solid var(--line);
  background: #0d1524;
  color: var(--text);
  border-radius: 12px;
  padding: 0.85rem 0.95rem;
  font: inherit;
  font-size: 1rem;
}

input[type="email"]:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
  border-color: var(--accent);
}

input[type="email"][aria-invalid="true"] {
  border-color: var(--danger);
}

.btn {
  appearance: none;
  border: 0;
  border-radius: 12px;
  background: linear-gradient(180deg, #4bb3ff, var(--accent-strong));
  color: #041018;
  font: inherit;
  font-weight: 800;
  padding: 0.9rem 1rem;
  cursor: pointer;
  transition: transform 0.12s ease, filter 0.12s ease;
}

.btn:hover {
  filter: brightness(1.05);
}

.btn:active {
  transform: translateY(1px);
}

.btn:focus-visible {
  outline: 2px solid #fff;
  outline-offset: 2px;
}

.btn:disabled {
  opacity: 0.7;
  cursor: not-allowed;
}

.form-status {
  min-height: 1.4em;
  font-size: 0.9rem;
  margin: 0;
}

.form-status[data-tone="ok"] {
  color: var(--ok);
}

.form-status[data-tone="err"] {
  color: var(--danger);
}

.privacy-note {
  margin: 0.85rem 0 0;
  color: var(--muted);
  font-size: 0.8rem;
}

/* Sections */
section {
  padding: 2.4rem 0;
}

.section-title {
  margin: 0 0 0.5rem;
  font-size: clamp(1.35rem, 3vw, 1.75rem);
  letter-spacing: -0.01em;
}

.section-lead {
  margin: 0 0 1.4rem;
  color: var(--muted);
  max-width: 42rem;
}

.cards {
  display: grid;
  gap: 1rem;
}

@media (min-width: 720px) {
  .cards {
    grid-template-columns: repeat(3, 1fr);
  }
}

.card {
  background: rgba(18, 26, 43, 0.85);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.15rem;
}

.card h3 {
  margin: 0 0 0.45rem;
  font-size: 1.05rem;
}

.card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.format-tag {
  display: inline-block;
  margin-bottom: 0.55rem;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  background: var(--accent-soft);
  color: #cfe8ff;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.principles {
  display: grid;
  gap: 0.9rem;
}

@media (min-width: 720px) {
  .principles {
    grid-template-columns: 1fr 1fr;
  }
}

.principle {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.85rem;
  align-items: start;
  background: rgba(18, 26, 43, 0.75);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1rem 1.1rem;
}

.principle .num {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  display: grid;
  place-items: center;
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 800;
  font-size: 0.85rem;
}

.principle h3 {
  margin: 0 0 0.25rem;
  font-size: 1rem;
}

.principle p {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.disclaimer {
  margin-top: 1rem;
  padding: 0.95rem 1.05rem;
  border-radius: var(--radius);
  border: 1px dashed #3a506e;
  background: rgba(11, 18, 32, 0.55);
  color: var(--muted);
  font-size: 0.9rem;
}

.cta-band {
  margin: 1rem 0 2rem;
}

.cta-band .panel {
  display: grid;
  gap: 1rem;
}

@media (min-width: 800px) {
  .cta-band .panel {
    grid-template-columns: 1.1fr 0.9fr;
    align-items: center;
  }
}

.footer {
  border-top: 1px solid var(--line);
  padding: 1.5rem 0 2.2rem;
  color: var(--muted);
  font-size: 0.88rem;
}

.footer-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  justify-content: space-between;
  align-items: baseline;
}

[hidden] {
  display: none !important;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}