:root {
  color-scheme: dark;
  --ink: #17163f;
  --ink-deep: #11112f;
  --panel: #22214f;
  --paper: #f7f8fc;
  --white: #ffffff;
  --muted: #c1c0d8;
  --line: rgba(255, 255, 255, 0.18);
  --highlight: #9a8fff;
  --sky: #62d8ff;
  --sky-soft: #b9e9ff;
  --violet: #7768ff;
  --violet-dark: #5747d6;
  --lavender: #dedaff;
  --content: 1180px;
  --radius: 22px;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 78px;
}

body {
  margin: 0;
  background: var(--ink);
  color: var(--white);
  font-family: Inter, "Helvetica Neue", "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, sans-serif;
  font-size: 1rem;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }

.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 100;
  padding: 10px 14px;
  background: var(--white);
  color: var(--ink);
  transform: translateY(-150%);
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 70px;
  padding: 10px max(20px, calc((100vw - var(--content)) / 2));
  border-bottom: 1px solid var(--line);
  background: rgba(17, 17, 47, 0.9);
  backdrop-filter: blur(16px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--white);
  font-size: 0.92rem;
  font-weight: 750;
  letter-spacing: 0.08em;
  text-decoration: none;
}

.brand strong { color: var(--sky); }

.brand-mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border: 1px solid rgba(255, 255, 255, 0.35);
  border-radius: 10px;
  font-weight: 900;
  transform: rotate(-4deg);
}

.site-nav {
  display: flex;
  gap: 24px;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.site-nav a {
  color: #d8d7ea;
  text-decoration: none;
}

.site-nav a:hover,
.site-nav a:focus-visible { color: var(--sky); }

.hero {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(360px, 1.1fr);
  gap: clamp(28px, 5vw, 72px);
  align-items: center;
  min-height: calc(100svh - 70px);
  max-width: var(--content);
  margin: 0 auto;
  padding: clamp(52px, 9vw, 112px) 20px 34px;
}

.hero-copy { position: relative; z-index: 2; }

.eyebrow {
  margin: 0 0 20px;
  color: var(--sky);
  font-size: 0.76rem;
  font-weight: 900;
  letter-spacing: 0.18em;
  line-height: 1.4;
}

h1, h2, h3, p { overflow-wrap: anywhere; }

h1, h2 {
  margin: 0;
  font-weight: 900;
  letter-spacing: -0.055em;
  line-height: 1.12;
}

h1 { font-size: clamp(3.15rem, 7.5vw, 6.8rem); }
h2 { font-size: clamp(2.4rem, 5.6vw, 5.2rem); }
h1 em, h2 em { color: var(--highlight); font-style: normal; }

.hero-lead {
  max-width: 620px;
  margin: 30px 0 0;
  color: #d9d8eb;
  font-size: clamp(1.03rem, 1.7vw, 1.26rem);
  line-height: 1.85;
}

.beta-panel {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(320px, .85fr);
  gap: clamp(28px, 5vw, 64px);
  align-items: start;
  margin-top: 0;
  padding: clamp(24px, 4vw, 42px);
  border: 1px solid rgba(98, 216, 255, 0.42);
  border-radius: 18px;
  background: linear-gradient(135deg, rgba(98, 216, 255, 0.12), rgba(119, 104, 255, 0.1));
}

.beta-kicker {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 12px;
  color: var(--sky-soft);
  font-size: .75rem;
  font-weight: 900;
  letter-spacing: .12em;
}

.beta-kicker span {
  padding: 3px 9px;
  border-radius: 999px;
  background: var(--sky);
  color: var(--ink-deep);
  letter-spacing: .16em;
}

.beta-panel h2 {
  font-size: clamp(1.45rem, 2.5vw, 2rem);
  letter-spacing: -.035em;
  line-height: 1.3;
}

.beta-copy > p:not(.beta-kicker) {
  margin: 14px 0 0;
  color: #d9d8eb;
  font-size: .96rem;
  line-height: 1.75;
}

.beta-facts {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.beta-facts li {
  display: grid;
  grid-template-columns: 58px minmax(0, 1fr);
  gap: 10px;
  align-items: start;
}

.beta-facts strong {
  color: var(--sky);
  font-size: .78rem;
  letter-spacing: .08em;
}

.beta-facts span { font-size: .9rem; line-height: 1.55; }
.beta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}
.beta-note { margin: 10px 0 0; color: #aaa9c4; font-size: .76rem; line-height: 1.6; }

.next-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 52px;
  padding: 13px 22px;
  border-radius: 999px;
  font-weight: 800;
  line-height: 1.3;
  text-decoration: none;
}

.button:focus-visible,
.site-nav a:focus-visible,
summary:focus-visible,
.brand:focus-visible {
  outline: 3px solid var(--sky);
  outline-offset: 4px;
}

.button-primary { background: var(--sky); color: var(--ink-deep); }
.button-primary:hover { background: var(--white); }
.button-secondary { border: 1px solid rgba(255,255,255,.35); color: var(--white); }
.button-secondary:hover { border-color: var(--sky); color: var(--sky); }

.hero-video {
  width: min(100%, 560px);
  aspect-ratio: 1;
  justify-self: center;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: var(--radius);
  background: #000;
  box-shadow: 0 28px 70px rgba(0, 0, 0, 0.34);
}
.hero-video iframe { display: block; width: 100%; height: 100%; border: 0; }

.message-strip {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  margin-top: 20px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--line);
}

.message-strip p { margin: 0; padding: 24px 22px 28px; background: var(--ink); font-size: clamp(1.05rem, 1.75vw, 1.4rem); font-weight: 800; line-height: 1.5; letter-spacing: -.025em; }
.message-strip span { display: flex; gap: 9px; align-items: center; margin-bottom: 12px; color: var(--sky); font-size: .65rem; letter-spacing: .14em; }
.message-strip b { color: var(--highlight); font-weight: 900; }

.section { padding: clamp(78px, 12vw, 150px) max(20px, calc((100vw - var(--content)) / 2)); }
.section-dark { background: var(--ink-deep); }
.section-heading { max-width: 840px; }
.section-heading.wide { max-width: 1050px; }
.section-heading > p:last-child,
.parts-intro > p:last-child,
.performance-copy > p,
.next-step > p { max-width: 690px; margin: 28px 0 0; color: #bcbcc3; font-size: 1.06rem; }

.experience-flow { display: grid; grid-template-columns: minmax(280px, 480px) minmax(0, 1fr); gap: clamp(28px, 6vw, 72px); align-items: center; max-width: 1100px; margin-top: 58px; }
.steps { display: grid; grid-template-columns: 1fr; gap: 18px; margin: 0; padding: 0; list-style: none; }
.steps li { display: grid; gap: 30px; min-height: 220px; padding: 26px; border-top: 4px solid var(--sky); background: var(--panel); }
.step-number { font-size: .78rem; font-weight: 900; letter-spacing: .16em; }
.steps strong { font-size: 1.3rem; line-height: 1.4; }
.steps p { margin: 12px 0 0; color: #bdbdc4; font-size: .94rem; }
.experience-demo {
  width: 100%;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #000;
}
.experience-demo img { display: block; width: 100%; height: auto; }
.audience { background: var(--paper); color: var(--ink); }
.audience .eyebrow { color: var(--violet-dark); }
.audience h2 em { color: var(--violet-dark); }
.audience-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-top: 60px; }
.audience-card { display: flex; flex-direction: column; min-height: 420px; padding: clamp(28px, 5vw, 54px); border-radius: var(--radius); }
.listener-card { background: var(--sky-soft); }
.musician-card { background: var(--lavender); }
.card-kicker { margin: 0; font-size: .73rem; font-weight: 900; letter-spacing: .17em; }
.audience-card h3 { max-width: 490px; margin: auto 0 16px; font-size: clamp(2rem, 3.8vw, 3.35rem); line-height: 1.18; letter-spacing: -.04em; }
.audience-card > p:not(.card-kicker) { margin: 0; max-width: 570px; }
.tag-list { display: flex; flex-wrap: wrap; gap: 8px; margin: 26px 0 0; padding: 0; list-style: none; }
.tag-list li { padding: 5px 12px; border: 1px solid rgba(23,22,63,.35); border-radius: 999px; font-size: .78rem; font-weight: 800; }

.music-parts { display: grid; grid-template-columns: .85fr 1.15fr; gap: clamp(45px, 9vw, 120px); background: var(--ink-deep); }
.parts-intro { align-self: center; }
.parts-demo {
  width: min(100%, 480px);
  margin: 36px 0 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #000;
}
.parts-demo img { display: block; width: 100%; height: auto; }
.parts-list { border-top: 1px solid var(--line); }
.part-item { display: grid; grid-template-columns: 32px 52px 1fr auto; align-items: center; gap: 16px; padding: 17px 4px; border-bottom: 1px solid var(--line); --part-color: var(--sky); }
.part-beat { --part-color: #b060e0; }
.part-sampler { --part-color: #e05050; }
.part-bass { --part-color: #4088d8; }
.part-melody { --part-color: #40c0a0; }
.part-chord { --part-color: #e0a040; }
.part-number { color: var(--part-color); font-size: .68rem; font-weight: 900; }
.part-icon { display: grid; place-items: center; width: 48px; height: 48px; overflow: hidden; border: 1px solid color-mix(in srgb, var(--part-color) 72%, white); border-radius: 14px; background: var(--part-color); box-shadow: inset 0 1px 0 rgba(255,255,255,.28), 0 6px 18px color-mix(in srgb, var(--part-color) 22%, transparent); }
.part-icon img { display: block; width: 36px; height: 36px; object-fit: contain; }
.parts-list strong { color: var(--part-color); font-size: clamp(1.4rem, 2.5vw, 2.2rem); letter-spacing: -.03em; }
.parts-list small { color: #9e9ea5; }
.parts-note { margin: 24px 0 0; padding-left: 62px; color: var(--muted); font-size: .82rem; }

.performance { background: #1d1c4a; }
.performance-copy { max-width: 920px; }
.performance-copy h2 { font-size: clamp(2.6rem, 5vw, 4.8rem); }
.freedom-list { display: grid; gap: 1px; margin-top: 44px; background: var(--line); border: 1px solid var(--line); }
.freedom-list > div { display: grid; gap: 7px; padding: 20px; background: #1d1c4a; }
.freedom-list strong { color: var(--sky); font-size: .82rem; letter-spacing: .08em; }
.freedom-list span { color: var(--muted); font-size: .9rem; }

.possibilities { background: var(--paper); color: var(--ink); }
.possibilities .eyebrow { color: var(--violet-dark); }
.possibilities .section-heading > p:last-child { color: #4b496d; }
.feature-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; margin-top: 64px; background: rgba(23,22,63,.18); border: 1px solid rgba(23,22,63,.18); }
.feature-grid article { min-height: 300px; padding: clamp(28px, 5vw, 54px); background: var(--paper); }
.feature-grid article > span { color: var(--violet-dark); font-size: .7rem; font-weight: 900; letter-spacing: .16em; }
.feature-grid h3 { margin: 78px 0 12px; font-size: clamp(1.6rem, 3vw, 2.4rem); letter-spacing: -.04em; line-height: 1.25; }
.feature-grid p { margin: 0; color: #555274; }

.usability { background: var(--ink-deep); }
.reason-list { max-width: 920px; margin: 64px 0 0; padding: 0; list-style: none; }
.reason-list li { display: grid; gap: 8px; padding: 24px 0; border-bottom: 1px solid var(--line); }
.reason-list strong { font-size: 1.25rem; }
.reason-list span { color: var(--muted); }

.details { background: var(--ink); }
.details-grid { display: grid; grid-template-columns: .9fr 1.1fr; gap: clamp(50px, 9vw, 110px); margin-top: 68px; }
.details-grid h3 { margin: 0 0 20px; font-size: 1.5rem; }
.spec-list { margin: 0; }
.spec-list > div { display: grid; grid-template-columns: 125px 1fr; gap: 16px; padding: 15px 0; border-bottom: 1px solid var(--line); }
.spec-list dt { color: #a5a5ad; font-size: .85rem; }
.spec-list dd { margin: 0; font-weight: 700; line-height: 1.6; }
.spec-note { color: #aaa9c4; font-size: .75rem; }
.faq details { border-bottom: 1px solid var(--line); }
.faq summary { position: relative; padding: 21px 42px 21px 0; cursor: pointer; font-weight: 750; list-style: none; line-height: 1.5; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { position: absolute; right: 4px; content: "+"; color: var(--sky); font-size: 1.6rem; font-weight: 400; }
.faq details[open] summary::after { content: "−"; }
.faq details p { margin: -4px 0 24px; color: var(--muted); }

.next-step { text-align: center; background: var(--ink); }
.next-step > p { margin-right: auto; margin-left: auto; }
.next-actions { justify-content: center; }
.release-note { font-size: .8rem !important; }

.site-footer { display: grid; grid-template-columns: 1fr auto; gap: 10px 30px; align-items: center; padding: 38px max(20px, calc((100vw - var(--content)) / 2)); border-top: 1px solid var(--line); color: #aaa9c4; font-size: .78rem; }
.site-footer p { margin: 0; }

@media (max-width: 900px) {
  .site-header { align-items: flex-start; gap: 15px; }
  .site-nav { max-width: 56vw; overflow-x: auto; gap: 17px; padding: 7px 0 5px; white-space: nowrap; }
  .hero { grid-template-columns: 1fr; min-height: auto; }
  .hero-video { width: min(100%, 520px); }
  .beta-panel { grid-template-columns: 1fr; gap: 24px; }
  .message-strip { grid-template-columns: 1fr; }
  .experience-flow { grid-template-columns: 1fr; max-width: 560px; }
  .steps li { min-height: 0; gap: 22px; }
  .audience-grid,
  .music-parts,
  .details-grid { grid-template-columns: 1fr; }
  .parts-note { padding: 0; }
}

@media (max-width: 620px) {
  html { scroll-padding-top: 62px; }
  .site-header { min-height: 62px; }
  .brand > span:last-child { display: none; }
  .site-nav { max-width: calc(100vw - 70px); font-size: .76rem; }
  .hero { padding-top: 50px; }
  h1 { font-size: clamp(2.9rem, 15vw, 4.4rem); }
  h2 { font-size: clamp(2.3rem, 11.8vw, 3.5rem); }
  .hero-lead { line-height: 1.72; }
  .beta-panel { padding: 20px; }
  .beta-actions .button { width: 100%; }
  .audience-grid,
  .feature-grid { grid-template-columns: 1fr; }
  .audience-card { min-height: 390px; }
  .part-item { grid-template-columns: 25px 48px 1fr; gap: 12px; }
  .parts-list small { grid-column: 3; }
  .spec-list > div { grid-template-columns: 1fr; gap: 3px; }
  .next-actions { flex-direction: column; }
  .site-footer { grid-template-columns: 1fr; }
}

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