:root {
  --navy-950: #031a31;
  --navy-900: #062d52;
  --navy-800: #0a416b;
  --cyan-600: #008fc0;
  --cyan-500: #13b6dc;
  --cyan-200: #a9eafa;
  --sky-50: #f2fbfd;
  --ink: #102a3d;
  --muted: #587183;
  --line: #d8e8ee;
  --white: #ffffff;
  --shadow: 0 24px 70px rgba(4, 47, 78, 0.13);
  --radius-lg: 32px;
  --radius-md: 22px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  background: var(--white);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic", "Noto Sans JP", sans-serif;
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }
img { display: block; max-width: 100%; }
button, a { -webkit-tap-highlight-color: transparent; }

.shell { width: min(1120px, calc(100% - 48px)); margin-inline: auto; }
.narrow-shell { width: min(840px, calc(100% - 48px)); }

.skip-link {
  position: fixed;
  z-index: 100;
  top: 10px;
  left: 10px;
  transform: translateY(-150%);
  padding: 10px 16px;
  color: var(--navy-950);
  background: var(--white);
  border-radius: 10px;
}
.skip-link:focus { transform: translateY(0); }

.site-header {
  position: absolute;
  z-index: 20;
  top: 0;
  left: 0;
  width: 100%;
  color: var(--white);
}

.solid-header { position: relative; background: var(--navy-950); }

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 84px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-size: 17px;
  font-weight: 800;
  letter-spacing: .01em;
  text-decoration: none;
}

.brand img,
.footer-brand img {
  border-radius: 11px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, .17);
}

nav { display: flex; align-items: center; gap: 32px; }
nav a { color: rgba(255, 255, 255, .78); font-size: 14px; font-weight: 700; text-decoration: none; }
nav a:hover, nav a:focus-visible { color: var(--white); }
.nav-contact { padding: 8px 16px; border: 1px solid rgba(255, 255, 255, .25); border-radius: 999px; }

.hero {
  position: relative;
  min-height: 730px;
  overflow: hidden;
  color: var(--white);
  background: linear-gradient(135deg, var(--navy-950) 0%, var(--navy-900) 47%, #007da9 100%);
}

.hero::after {
  position: absolute;
  right: -10%;
  bottom: -180px;
  left: -10%;
  height: 290px;
  content: "";
  background: var(--white);
  border-radius: 50% 50% 0 0;
}

.hero-grid {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1.06fr .94fr;
  align-items: center;
  gap: 64px;
  min-height: 690px;
  padding-top: 92px;
  padding-bottom: 70px;
}

.hero-glow { position: absolute; border-radius: 50%; filter: blur(12px); }
.hero-glow-one { top: 90px; right: 4%; width: 460px; height: 460px; background: rgba(35, 210, 240, .14); }
.hero-glow-two { bottom: -80px; left: 18%; width: 400px; height: 320px; background: rgba(0, 157, 204, .14); }

.eyebrow, .section-kicker {
  margin: 0 0 16px;
  color: var(--cyan-600);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .16em;
  text-transform: uppercase;
}
.eyebrow { display: flex; align-items: center; gap: 10px; color: var(--cyan-200); }
.eyebrow span { display: block; width: 26px; height: 1px; background: currentColor; }

.hero h1 {
  margin: 0;
  font-size: clamp(48px, 6vw, 78px);
  line-height: 1.13;
  letter-spacing: -.045em;
}

.hero-lead { max-width: 560px; margin: 28px 0 0; color: rgba(255, 255, 255, .75); font-size: 18px; line-height: 1.9; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 38px; }

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 54px;
  padding: 0 24px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 800;
  text-decoration: none;
  transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
}
.button:hover { transform: translateY(-2px); }
.button:focus-visible { outline: 3px solid var(--cyan-200); outline-offset: 3px; }
.button-primary { color: var(--navy-950); background: var(--white); box-shadow: 0 16px 34px rgba(1, 23, 43, .2); }
.button-secondary { color: var(--white); border: 1px solid rgba(255, 255, 255, .3); background: rgba(255, 255, 255, .08); }
.button-white { color: var(--navy-950); background: var(--white); box-shadow: 0 14px 34px rgba(0, 30, 51, .2); }

.hero-visual { position: relative; display: grid; place-items: center; min-height: 460px; }
.icon-card { position: relative; z-index: 3; padding: 14px; background: rgba(255, 255, 255, .13); border: 1px solid rgba(255, 255, 255, .25); border-radius: 54px; box-shadow: 0 38px 80px rgba(0, 23, 43, .32); backdrop-filter: blur(12px); }
.icon-card img { width: 230px; height: 230px; border-radius: 42px; }
.sound-ring { position: absolute; border: 1px solid rgba(255, 255, 255, .16); border-radius: 50%; }
.ring-one { width: 320px; height: 320px; }
.ring-two { width: 400px; height: 400px; }
.ring-three { width: 480px; height: 480px; }
.playing-pill { position: absolute; z-index: 4; right: 3%; bottom: 44px; display: flex; align-items: center; gap: 9px; padding: 11px 16px; color: var(--navy-950); background: rgba(255, 255, 255, .94); border-radius: 999px; box-shadow: 0 14px 30px rgba(1, 34, 54, .2); font-size: 12px; font-weight: 800; }
.pulse { width: 8px; height: 8px; background: #19b990; border-radius: 50%; box-shadow: 0 0 0 5px rgba(25, 185, 144, .13); }

.section { padding: 112px 0; }
.section h2 { margin: 0; color: var(--navy-950); font-size: clamp(34px, 4.5vw, 52px); line-height: 1.3; letter-spacing: -.035em; }

.intro-section { position: relative; z-index: 3; margin-top: -50px; padding-top: 90px; }
.intro-section > .shell > .section-kicker,
.intro-section > .shell > h2 { text-align: center; }
.feature-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; margin-top: 54px; }
.feature-card { padding: 30px 27px 28px; background: var(--sky-50); border: 1px solid rgba(0, 129, 171, .08); border-radius: var(--radius-md); }
.feature-icon { display: grid; place-items: center; width: 48px; height: 48px; color: var(--white); background: linear-gradient(145deg, var(--navy-800), var(--cyan-500)); border-radius: 15px; font-size: 20px; font-weight: 800; box-shadow: 0 12px 24px rgba(0, 126, 167, .2); }
.feature-card h3 { margin: 24px 0 8px; color: var(--navy-950); font-size: 18px; }
.feature-card p { margin: 0; color: var(--muted); font-size: 14px; line-height: 1.85; }

.guide-section { background: #f7fbfc; }
.guide-layout { display: grid; grid-template-columns: .8fr 1.2fr; gap: 100px; }
.guide-heading { position: sticky; top: 40px; align-self: start; }
.guide-heading > p:last-child { margin: 22px 0 0; color: var(--muted); }
.steps { margin: 0; padding: 0; list-style: none; }
.steps li { display: grid; grid-template-columns: 64px 1fr; gap: 24px; padding: 0 0 38px; }
.steps li:not(:last-child) { margin-bottom: 38px; border-bottom: 1px solid var(--line); }
.step-number { display: grid; place-items: center; width: 56px; height: 56px; color: var(--cyan-600); background: var(--white); border: 1px solid var(--line); border-radius: 50%; font-size: 13px; font-weight: 900; }
.steps h3 { margin: 2px 0 8px; color: var(--navy-950); font-size: 21px; }
.steps p { margin: 0; color: var(--muted); }

.faq-section { background: var(--white); }
.faq-section .section-kicker, .faq-section h2 { text-align: center; }
.faq-list { margin-top: 52px; border-top: 1px solid var(--line); }
.faq-list details { border-bottom: 1px solid var(--line); }
.faq-list summary { position: relative; padding: 24px 52px 24px 4px; color: var(--navy-950); cursor: pointer; font-size: 17px; font-weight: 800; list-style: none; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after { position: absolute; top: 50%; right: 10px; width: 30px; height: 30px; content: "+"; color: var(--cyan-600); background: var(--sky-50); border-radius: 50%; line-height: 28px; text-align: center; transform: translateY(-50%); }
.faq-list details[open] summary::after { content: "−"; }
.faq-list details p { margin: -4px 0 24px; padding: 0 52px 0 4px; color: var(--muted); }

.credits-section { background: #f7fbfc; }
.credits-section .section-kicker,
.credits-section h2,
.credits-lead { text-align: center; }
.credits-lead { max-width: 680px; margin: 20px auto 0; color: var(--muted); }
.credits-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; margin-top: 44px; }
.credit-card { padding: 32px; background: var(--white); border: 1px solid var(--line); border-radius: var(--radius-md); box-shadow: 0 14px 40px rgba(4, 47, 78, .07); }
.credit-source { margin: 0 0 5px; color: var(--cyan-600); font-size: 13px; font-weight: 800; }
.credit-card h3 { margin: 0; color: var(--navy-950); font-size: 21px; }
.credit-card > p:not(.credit-source) { margin: 15px 0 20px; color: var(--muted); }
.credit-card a { color: var(--cyan-600); font-size: 14px; font-weight: 800; text-decoration: none; }
.credit-card a:hover { text-decoration: underline; }

.contact-section { padding-top: 35px; }
.contact-card { display: grid; grid-template-columns: 1.15fr .85fr; align-items: center; gap: 48px; padding: 60px 64px; color: var(--white); background: linear-gradient(135deg, var(--navy-950), #006b96); border-radius: var(--radius-lg); box-shadow: var(--shadow); }
.section-kicker.light { color: var(--cyan-200); }
.contact-card h2 { color: var(--white); font-size: clamp(30px, 4vw, 46px); }
.contact-card p:not(.section-kicker) { max-width: 610px; margin: 20px 0 0; color: rgba(255, 255, 255, .68); }
.contact-action { display: flex; flex-direction: column; align-items: flex-start; gap: 15px; }
.email-link { color: rgba(255, 255, 255, .8); font-size: 13px; overflow-wrap: anywhere; }

footer { padding: 44px 0; color: var(--muted); background: var(--sky-50); font-size: 13px; }
.footer-inner { display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 28px; }
.footer-brand { display: flex; align-items: center; gap: 10px; color: var(--navy-950); font-size: 15px; font-weight: 800; }
.footer-links { display: flex; gap: 24px; }
.footer-links a { text-decoration: none; }
.footer-links a:hover { color: var(--cyan-600); }
.footer-inner > p { margin: 0; text-align: right; }

.policy-page { background: #f4fafc; }
.policy-main { padding: 70px 0 100px; }
.policy-card { max-width: 860px; padding: 64px 72px; background: var(--white); border: 1px solid var(--line); border-radius: var(--radius-lg); box-shadow: var(--shadow); }
.policy-card > h1 { margin: 0; color: var(--navy-950); font-size: clamp(34px, 5vw, 50px); letter-spacing: -.04em; }
.policy-date { margin: 10px 0 42px; color: var(--muted); font-size: 13px; }
.policy-card h2 { margin: 42px 0 10px; color: var(--navy-900); font-size: 21px; }
.policy-card p { color: #415e70; }
.policy-contact { margin-top: 52px; padding: 28px 30px; background: var(--sky-50); border-radius: 18px; }
.policy-contact h2 { margin-top: 0; }
.policy-contact a { color: var(--cyan-600); font-weight: 800; overflow-wrap: anywhere; }

.not-found-page { display: grid; place-items: center; min-height: 100vh; padding: 24px; color: var(--white); background: linear-gradient(135deg, var(--navy-950), #007da9); }
.not-found-card { width: min(560px, 100%); padding: 52px; color: var(--ink); background: var(--white); border-radius: var(--radius-lg); box-shadow: var(--shadow); text-align: center; }
.not-found-card img { margin: 0 auto 24px; border-radius: 25px; }
.not-found-card h1 { margin: 0; color: var(--navy-950); font-size: 34px; }
.not-found-card p:not(.section-kicker) { margin: 14px 0 28px; color: var(--muted); }
.not-found-card .button-primary { color: var(--white); background: var(--navy-900); }

@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; gap: 12px; padding-top: 145px; padding-bottom: 145px; text-align: center; }
  .hero-lead { margin-inline: auto; }
  .eyebrow, .hero-actions { justify-content: center; }
  .hero-visual { min-height: 390px; }
  .icon-card img { width: 190px; height: 190px; }
  .ring-one { width: 275px; height: 275px; }
  .ring-two { width: 340px; height: 340px; }
  .ring-three { width: 400px; height: 400px; }
  .playing-pill { right: 12%; bottom: 35px; }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .guide-layout { grid-template-columns: 1fr; gap: 55px; }
  .guide-heading { position: static; text-align: center; }
  .contact-card { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; justify-items: center; }
  .footer-inner > p { text-align: center; }
}

@media (max-width: 640px) {
  .shell, .narrow-shell { width: min(100% - 32px, 1120px); }
  .header-inner { min-height: 72px; }
  .brand img { width: 38px; height: 38px; }
  nav { gap: 8px; }
  nav a:not(.nav-contact) { display: none; }
  .nav-contact { padding: 7px 12px; font-size: 12px; }
  .hero { min-height: 830px; }
  .hero-grid { min-height: 780px; padding-top: 120px; padding-bottom: 100px; }
  .hero h1 { font-size: clamp(43px, 13vw, 60px); }
  .hero-lead { font-size: 16px; }
  .hero-actions { flex-direction: column; align-items: stretch; }
  .hero-visual { min-height: 350px; }
  .ring-three { width: 340px; height: 340px; }
  .ring-two { width: 290px; height: 290px; }
  .ring-one { width: 245px; height: 245px; }
  .icon-card { padding: 10px; border-radius: 43px; }
  .icon-card img { width: 170px; height: 170px; border-radius: 34px; }
  .playing-pill { right: 1%; bottom: 30px; }
  .section { padding: 80px 0; }
  .intro-section { padding-top: 65px; }
  .feature-grid { grid-template-columns: 1fr; margin-top: 38px; }
  .feature-card { padding: 26px; }
  .credits-grid { grid-template-columns: 1fr; }
  .credit-card { padding: 26px; }
  .steps li { grid-template-columns: 48px 1fr; gap: 17px; }
  .step-number { width: 46px; height: 46px; }
  .contact-section { padding-top: 10px; }
  .contact-card { width: calc(100% - 24px); padding: 40px 25px; border-radius: 26px; }
  .contact-action { align-items: stretch; }
  .email-link { text-align: center; }
  .footer-links { flex-direction: column; align-items: center; gap: 8px; }
  .policy-main { padding: 22px 0 60px; }
  .policy-card { width: calc(100% - 24px); padding: 36px 24px; border-radius: 24px; }
  .not-found-card { padding: 40px 22px; }
  .not-found-card h1 { font-size: 27px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; }
}