:root {
  --bg: #050505;
  --bg-elevated: #121110;
  --ink: #f4f1ea;
  --ink-muted: #a49e94;
  --line: rgba(244, 241, 234, 0.08);
  --accent: #41ddee;
  --accent-hover: #7aecf6;
  --link: #8bdfe8;
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.28);
  --radius: 18px;
  --font-sans: "DM Sans", "Noto Sans JP", "Segoe UI", sans-serif;
  --topbar-bg: rgba(5, 5, 5, 0.55);
  --panel-fill: rgba(18, 17, 16, 0.42);
  --glass-blur: 14px;
  --on-accent: #050505;
  --violet: 158, 124, 255;
  --magenta: 255, 36, 224;
  --cyan: 41, 221, 238;
  --amber: 249, 135, 55;
  --wave-bg: #1a1814;
  --wave-played: #41ddee;
  --wave-rest: #5a564c;
  --now-playing: #e8c48a;
  --row-hover: rgba(65, 221, 238, 0.08);
  --page: 1080px;
  --toc-width: 11.5rem;
  --shell: calc(var(--page) + var(--toc-width) + 2.5rem);
  color-scheme: dark;
}

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

html {
  scroll-behavior: smooth;
  overflow-x: hidden;
  width: 100%;
  max-width: 100%;
  overscroll-behavior-x: none;
}

body {
  margin: 0;
  min-height: 100vh;
  width: 100%;
  max-width: 100%;
  overflow-x: hidden;
  overscroll-behavior-x: none;
  touch-action: pan-y;
  font-family: var(--font-sans);
  font-size: 1.05rem;
  line-height: 1.65;
  color: var(--ink);
  background: var(--bg);
}

.bg-terrain {
  position: fixed;
  inset: 0;
  z-index: 0;
  width: 100% !important;
  height: 100% !important;
  max-width: 100%;
  max-height: 100%;
  pointer-events: none;
  display: block;
}

a {
  color: var(--link);
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--accent-hover);
}

code {
  font-family: ui-monospace, "Cascadia Code", "Segoe UI Mono", monospace;
  font-size: 0.86em;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.08em 0.4em;
  word-break: break-all;
}

@media (prefers-reduced-motion: reduce) {
  .bg-terrain {
    display: none;
  }

  body {
    background:
      radial-gradient(880px 480px at 8% -18%, rgba(var(--violet), 0.16), transparent 58%),
      radial-gradient(720px 420px at 96% 0%, rgba(var(--cyan), 0.1), transparent 55%),
      radial-gradient(640px 360px at 80% 100%, rgba(var(--amber), 0.08), transparent 52%),
      radial-gradient(520px 300px at 0% 88%, rgba(var(--magenta), 0.08), transparent 50%),
      var(--bg);
  }
}

.topbar,
.site-chrome,
.page-shell,
main,
footer {
  position: relative;
  z-index: 1;
}

.site-chrome {
  z-index: 10;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid var(--line);
  background: var(--topbar-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
}

.topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0.85rem 1.5rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.7rem;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  color: inherit;
  text-decoration: none;
}

.brand-link:hover {
  color: inherit;
}

.brand-link:hover .wordmark {
  color: var(--accent-hover);
}

.brand-mark {
  width: 2.15rem;
  height: 2.15rem;
  border-radius: 8px;
  object-fit: cover;
  background: #000;
  box-shadow: 0 0 0 1px var(--line);
}

.wordmark {
  margin: 0;
  font-family: "Montserrat", var(--font-sans);
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  line-height: 1;
  transition: color 0.15s ease;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.nav-link {
  color: var(--ink-muted);
  font-size: 0.88rem;
  font-weight: 500;
  text-decoration: none;
}

.nav-link--btn {
  margin: 0;
  padding: 0;
  border: 0;
  background: none;
  font: inherit;
  cursor: pointer;
}

.pricing-cta {
  margin: 1rem 0 0;
}

.account-backdrop {
  position: fixed;
  inset: 0;
  z-index: 40;
  display: grid;
  place-items: center;
  padding: 1.25rem;
  background: rgba(6, 5, 4, 0.72);
  backdrop-filter: blur(10px);
}

.account-backdrop[hidden] {
  display: none;
}

.account-card {
  width: min(24rem, 100%);
  max-height: min(90vh, 40rem);
  overflow: auto;
  padding: 1.25rem 1.3rem 1.1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(18, 17, 16, 0.96);
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.45);
}

.account-card h2 {
  margin: 0 0 0.75rem;
  font-size: 1.15rem;
  font-weight: 600;
}

.account-hint,
.account-divider {
  color: var(--ink-muted);
  font-size: 0.9rem;
  line-height: 1.55;
}

.account-notice {
  margin: 0 0 0.75rem;
  color: var(--accent-hover);
  font-size: 0.9rem;
  line-height: 1.5;
}

.account-error {
  margin: 0 0 0.75rem;
  color: #f2a0a0;
  font-size: 0.88rem;
  line-height: 1.5;
}

.account-google {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  width: 100%;
  margin: 0.4rem 0 0.85rem;
  padding: 0.7rem 0.9rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.04);
  color: var(--ink);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}

.account-google:hover {
  border-color: rgba(65, 221, 238, 0.35);
}

.account-google-mark {
  display: grid;
  place-items: center;
  width: 1.35rem;
  height: 1.35rem;
  border-radius: 999px;
  background: #fff;
  color: #1a73e8;
  font-size: 0.78rem;
  font-weight: 700;
}

.account-divider {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 0.6rem;
  margin: 0 0 0.85rem;
  text-align: center;
}

.account-divider::before,
.account-divider::after {
  content: "";
  height: 1px;
  background: var(--line);
}

.account-form {
  display: grid;
  gap: 0.4rem;
}

.account-form label {
  margin-top: 0.25rem;
  color: var(--ink-muted);
  font-size: 0.8rem;
}

.account-form input {
  padding: 0.55rem 0.7rem;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: rgba(0, 0, 0, 0.28);
  color: var(--ink);
  font: inherit;
}

.account-form .btn {
  margin-top: 0.55rem;
}

.account-text-btn {
  display: block;
  margin: 0.55rem 0 0;
  padding: 0;
  border: 0;
  background: none;
  color: var(--link);
  font: inherit;
  font-size: 0.88rem;
  cursor: pointer;
}

.account-text-btn:hover {
  color: var(--accent-hover);
}

.account-actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.5rem;
  margin-top: 1rem;
}

.ghost-btn {
  padding: 0.45rem 0.8rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: transparent;
  color: var(--ink-muted);
  font: inherit;
  font-size: 0.88rem;
  cursor: pointer;
}

.ghost-btn:hover {
  color: var(--ink);
  border-color: rgba(255, 255, 255, 0.22);
}

.lang-switch {
  display: flex;
  padding: 3px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--bg-elevated);
}

.lang-switch button {
  display: grid;
  place-items: center;
  margin: 0;
  border: 0;
  border-radius: 999px;
  padding: 0.28rem 0.42rem;
  background: transparent;
  color: var(--ink-muted);
  cursor: pointer;
  line-height: 0;
  opacity: 0.55;
  transition: opacity 0.15s ease, background 0.15s ease;
}

.lang-switch button[aria-pressed="true"] {
  background: rgba(244, 241, 234, 0.1);
  opacity: 1;
}

.lang-switch button:hover {
  opacity: 0.9;
}

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

.lang-flag {
  display: block;
  width: 1.35rem;
  height: 0.9rem;
  border-radius: 2px;
  box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.12);
}

.page-shell {
  display: grid;
  grid-template-columns: var(--toc-width) minmax(0, var(--page));
  gap: 2.5rem;
  align-items: start;
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 2rem 1.5rem 3.5rem;
  box-sizing: border-box;
  min-width: 0;
}

.toc--mobile {
  display: none;
}

.toc--desktop {
  display: block;
  position: sticky;
  top: 5.2rem;
  align-self: start;
  padding: 0.15rem 0 0;
}

.toc-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-left: 1px solid var(--line);
}

.toc-list li {
  margin: 0;
}

.toc-link {
  position: relative;
  display: block;
  margin: 0;
  padding: 0.38rem 0 0.38rem 0.95rem;
  color: var(--ink-muted);
  font-size: 0.86rem;
  font-weight: 500;
  line-height: 1.35;
  text-decoration: none;
  transition: color 0.15s ease;
}

.toc-link::before {
  content: "";
  position: absolute;
  left: -1px;
  top: 0.35rem;
  bottom: 0.35rem;
  width: 2px;
  border-radius: 999px;
  background: transparent;
  transition: background 0.15s ease;
}

.toc-link:hover {
  color: var(--ink);
}

.toc-link.is-active {
  color: var(--ink);
}

.toc-link.is-active::before {
  background: var(--accent);
}

.toc-link:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 6px;
}

.page-shell main {
  max-width: none;
  margin: 0;
  padding: 0;
  min-width: 0;
}

main {
  max-width: var(--page);
  margin: 0 auto;
  padding: 2rem 1.5rem 3.5rem;
}

#overview,
#studio-demo,
#features,
#use-cases,
#pricing,
#how-to,
#creator,
#requirements,
#download {
  scroll-margin-top: 5.5rem;
}

@media (max-width: 980px) {
  #overview,
  #studio-demo,
  #features,
  #use-cases,
  #pricing,
  #how-to,
  #creator,
  #requirements,
  #download {
    scroll-margin-top: 7.5rem;
  }
}

.hero {
  padding: 1.6rem 0 2rem;
  max-width: 40rem;
}

.eyebrow {
  margin: 0 0 0.75rem;
  color: var(--ink-muted);
  font-size: 0.9rem;
  font-weight: 500;
}

.hero h1 {
  margin: 0 0 1.05rem;
  font-family: var(--font-sans);
  font-size: clamp(1.85rem, 4.2vw, 2.7rem);
  font-weight: 600;
  line-height: 1.18;
  letter-spacing: -0.035em;
}

html[lang="ja"] .hero h1 {
  font-weight: 600;
  line-height: 1.4;
  letter-spacing: 0.01em;
  font-size: clamp(1.55rem, 3.8vw, 2.25rem);
}

.lede {
  margin: 0 0 0.9rem;
  font-size: 1.08rem;
  color: var(--ink);
}

.lede strong {
  font-weight: 600;
}

.note {
  margin: 0 0 1.6rem;
  color: var(--ink-muted);
}

.cta {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.7rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.85rem 1.3rem;
  border: 0;
  border-radius: 999px;
  background: var(--accent);
  color: var(--on-accent);
  font: inherit;
  font-weight: 600;
  text-decoration: none;
  box-shadow: 0 0 0 1px rgba(65, 221, 238, 0.08), 0 6px 20px rgba(65, 221, 238, 0.12);
}

.btn:hover {
  background: var(--accent-hover);
  color: var(--on-accent);
}

.btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.btn--soon,
.btn:disabled {
  cursor: default;
  background: rgba(255, 255, 255, 0.1);
  color: var(--ink-muted);
  box-shadow: none;
  border: 1px solid var(--line);
}

.btn--soon:hover,
.btn:disabled:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--ink-muted);
}

.cta-meta,
.cta-note,
.quiet,
footer,
.demo-caption {
  color: var(--ink-muted);
  font-size: 0.92rem;
}

.cta-meta,
.cta-note {
  margin: 0;
  max-width: 40rem;
}

.section {
  margin: 2.4rem 0 0;
  padding: 1.6rem 0 0;
  border-top: 1px solid var(--line);
}

.section-title {
  margin: 0 0 1.1rem;
  font-size: 1.28rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

html[lang="ja"] .section-title {
  letter-spacing: 0.02em;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
  gap: 1rem;
}

.feature-card,
.use-card {
  padding: 1.15rem 1.2rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(18, 17, 16, 0.55);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
}

.feature-card h3,
.use-card h3 {
  margin: 0 0 0.55rem;
  font-size: 1.02rem;
  font-weight: 600;
  letter-spacing: -0.015em;
  line-height: 1.35;
}

html[lang="ja"] .feature-card h3,
html[lang="ja"] .use-card h3 {
  letter-spacing: 0.02em;
}

.feature-card p,
.use-card p {
  margin: 0;
  color: var(--ink-muted);
  font-size: 0.93rem;
  line-height: 1.65;
}

.feature-card a {
  font-weight: 500;
}

.use-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

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

.pricing-card {
  padding: 1.15rem 1.2rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(18, 17, 16, 0.55);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
}

.pricing-card--highlight {
  border-color: rgba(65, 221, 238, 0.35);
  box-shadow: 0 0 0 1px rgba(65, 221, 238, 0.08);
}

.pricing-card h3 {
  margin: 0 0 0.35rem;
  font-size: 1.08rem;
  font-weight: 600;
}

.pricing-tag {
  margin: 0 0 0.45rem;
  color: var(--accent-hover);
  font-size: 0.82rem;
  font-weight: 600;
}

.pricing-price {
  margin: 0 0 0.65rem;
  color: var(--ink);
  font-size: 1.15rem;
  font-weight: 600;
}

.pricing-price strong {
  font-weight: 700;
}

.pricing-was {
  margin-right: 0.4rem;
  color: var(--ink-muted);
  font-size: 0.88rem;
  font-weight: 500;
  text-decoration: line-through;
}

.pricing-card p:last-child {
  margin: 0;
  color: var(--ink-muted);
  font-size: 0.93rem;
  line-height: 1.65;
}

.section-lede {
  margin: -0.35rem 0 1rem;
  max-width: 44rem;
  color: var(--ink-muted);
  font-size: 0.95rem;
  line-height: 1.65;
}

.compare-wrap {
  margin-top: 1.15rem;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(18, 17, 16, 0.55);
}

.compare-table {
  width: 100%;
  min-width: 32rem;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.compare-table th,
.compare-table td {
  padding: 0.7rem 0.85rem;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.compare-table thead th {
  color: var(--ink);
  font-weight: 600;
}

.compare-table tbody th {
  color: var(--ink);
  font-weight: 600;
  white-space: nowrap;
}

.compare-table td {
  color: var(--ink-muted);
}

.compare-table tbody tr:last-child th,
.compare-table tbody tr:last-child td {
  border-bottom: 0;
}

.compare-table thead th:last-child,
.compare-table tbody td:last-child {
  color: var(--ink);
  background: rgba(65, 221, 238, 0.06);
}

.compare-table thead th:last-child {
  font-weight: 700;
}

.how-to-list {
  margin: 0 0 0.85rem;
  padding-left: 1.2rem;
  color: var(--ink-muted);
  font-size: 0.95rem;
  line-height: 1.7;
}

.how-to-list li + li {
  margin-top: 0.45rem;
}

.how-to-list strong {
  color: var(--ink);
  font-weight: 600;
}

.pricing-note {
  margin: 0.85rem 0 0;
}

.creator-card {
  display: grid;
  grid-template-columns: min(11rem, 34%) 1fr;
  gap: 1.25rem;
  align-items: start;
  padding: 1.15rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(18, 17, 16, 0.55);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
}

.creator-photo {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 12px;
  object-fit: cover;
  aspect-ratio: 2 / 3;
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.35);
}

.creator-copy p {
  margin: 0 0 0.75rem;
  color: var(--ink-muted);
  font-size: 0.95rem;
  line-height: 1.65;
}

.creator-copy p:last-child {
  margin-bottom: 0;
}

.creator-role {
  color: var(--ink) !important;
  font-weight: 600;
}

.api-page {
  background: var(--bg);
}

.api-main {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 1.4rem 1.5rem 2.5rem;
}

.api-intro {
  max-width: 44rem;
  margin-bottom: 1.25rem;
}

.api-intro h1 {
  margin: 0 0 0.75rem;
  font-size: clamp(1.7rem, 3.5vw, 2.2rem);
  font-weight: 600;
}

.swagger-wrap {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: #121110;
}

.swagger-wrap .swagger-ui {
  font-family: var(--font-sans);
}

.swagger-wrap .swagger-ui .topbar,
.swagger-wrap .swagger-ui .information-container .link,
.swagger-wrap .swagger-ui .info .title small.version-stamp {
  display: none;
}

.swagger-wrap .swagger-ui,
.swagger-wrap .swagger-ui .wrapper,
.swagger-wrap .swagger-ui section.models,
.swagger-wrap .swagger-ui .opblock-tag-section,
.swagger-wrap .swagger-ui .opblock,
.swagger-wrap .swagger-ui table tbody tr td,
.swagger-wrap .swagger-ui table thead tr th,
.swagger-wrap .swagger-ui .model-box,
.swagger-wrap .swagger-ui .model,
.swagger-wrap .swagger-ui .response-col_status,
.swagger-wrap .swagger-ui .response-col_links,
.swagger-wrap .swagger-ui .parameter__name,
.swagger-wrap .swagger-ui .parameter__type,
.swagger-wrap .swagger-ui .prop-type,
.swagger-wrap .swagger-ui .markdown p,
.swagger-wrap .swagger-ui .markdown li,
.swagger-wrap .swagger-ui .info .title,
.swagger-wrap .swagger-ui .info .base-url,
.swagger-wrap .swagger-ui .info li,
.swagger-wrap .swagger-ui .info p,
.swagger-wrap .swagger-ui .opblock .opblock-summary-description,
.swagger-wrap .swagger-ui .opblock .opblock-summary-path,
.swagger-wrap .swagger-ui .opblock .opblock-summary-operation-id,
.swagger-wrap .swagger-ui .opblock-description-wrapper p,
.swagger-wrap .swagger-ui .responses-inner h4,
.swagger-wrap .swagger-ui .responses-inner h5,
.swagger-wrap .swagger-ui label,
.swagger-wrap .swagger-ui .btn,
.swagger-wrap .swagger-ui .tab li,
.swagger-wrap .swagger-ui .response-col_description__inner div {
  color: var(--ink);
}

.swagger-wrap .swagger-ui .info .title {
  color: var(--ink);
}

.swagger-wrap .swagger-ui .info .markdown p,
.swagger-wrap .swagger-ui .info .markdown li {
  color: var(--ink-muted);
}

.swagger-wrap .swagger-ui .opblock.opblock-post {
  border-color: rgba(65, 221, 238, 0.35);
  background: rgba(65, 221, 238, 0.06);
}

.swagger-wrap .swagger-ui .opblock.opblock-get {
  border-color: rgba(158, 124, 255, 0.35);
  background: rgba(158, 124, 255, 0.06);
}

.swagger-wrap .swagger-ui .opblock .opblock-summary-method {
  background: var(--accent);
  color: var(--on-accent);
}

.swagger-wrap .swagger-ui .opblock.opblock-get .opblock-summary-method {
  background: rgba(158, 124, 255, 0.85);
  color: #fff;
}

.swagger-wrap .swagger-ui .btn.execute {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--on-accent);
}

.swagger-wrap .swagger-ui .btn {
  border-color: var(--line);
  background: rgba(255, 255, 255, 0.04);
}

.swagger-wrap .swagger-ui input[type="text"],
.swagger-wrap .swagger-ui textarea,
.swagger-wrap .swagger-ui select {
  background: rgba(0, 0, 0, 0.35);
  border-color: var(--line);
  color: var(--ink);
}

.swagger-wrap .swagger-ui .scheme-container {
  background: rgba(18, 17, 16, 0.95);
  box-shadow: none;
  border-bottom: 1px solid var(--line);
}

.swagger-load-error {
  padding: 1.25rem 1.35rem;
}

.swagger-load-error p {
  margin: 0 0 0.5rem;
  color: var(--ink-muted);
}

.panel {
  padding: 1.4rem 0 0;
  border: 0;
  border-top: 1px solid var(--line);
  border-radius: 0;
  background: transparent;
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
  margin-top: 2.4rem;
}

.panel h2 {
  margin: 0 0 0.55rem;
  font-size: 1.28rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

html[lang="ja"] .panel h2 {
  letter-spacing: 0.02em;
}

.panel p {
  margin: 0.75rem 0 0;
}

.docs {
  max-width: 44rem;
  padding-top: 1.4rem;
}

.docs h1 {
  margin: 0 0 0.85rem;
  font-size: clamp(1.7rem, 3.5vw, 2.2rem);
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1.2;
}

html[lang="ja"] .docs h1 {
  letter-spacing: 0.01em;
}

.docs-block {
  margin: 1.75rem 0 0;
  padding: 1.25rem 0 0;
  border-top: 1px solid var(--line);
}

.docs-block h2 {
  margin: 0 0 0.7rem;
  font-size: 1.08rem;
  font-weight: 600;
}

.docs-block p,
.docs-block li {
  color: var(--ink-muted);
  font-size: 0.95rem;
}

.docs-block p {
  margin: 0 0 0.75rem;
}

.docs-block ol,
.docs-block ul {
  margin: 0 0 0.75rem;
  padding-left: 1.25rem;
}

.docs-block li {
  margin: 0 0 0.4rem;
}

.docs-block li:last-child {
  margin-bottom: 0;
}

.docs-block pre {
  margin: 0.55rem 0 1rem;
  padding: 0.9rem 1rem;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(0, 0, 0, 0.35);
  color: var(--ink);
  font-size: 0.82rem;
  line-height: 1.55;
}

.docs-block pre code {
  background: none;
  border: 0;
  padding: 0;
  border-radius: 0;
  font-size: inherit;
  word-break: normal;
  white-space: pre;
}

.docs-back {
  margin: 2rem 0 0;
  padding-top: 1.25rem;
  border-top: 1px solid var(--line);
}

.docs-back a {
  font-weight: 500;
  text-decoration: none;
}

.docs-back a:hover {
  text-decoration: underline;
}

.spec-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.4rem;
  margin-top: 1rem;
}

.spec-card {
  padding: 0;
  border: 0;
  border-radius: 0;
  background: transparent;
}

.studio-demo {
  margin: 0 0 0.5rem;
  display: grid;
  gap: 1.15rem;
}

.current-card {
  display: grid;
  grid-template-columns: 148px 1fr;
  grid-template-areas:
    "art heading"
    "art player";
  gap: 0.55rem 1.1rem;
  padding: 1.1rem;
  border-radius: var(--radius);
  background: rgba(18, 17, 16, 0.72);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.current-head {
  display: contents;
}

.art {
  grid-area: art;
  width: 148px;
  height: 148px;
  border-radius: 16px;
  position: relative;
  overflow: hidden;
  flex-shrink: 0;
  align-self: start;
}

.art-shape {
  position: absolute;
  inset: auto 18% 18% 18%;
  height: 54%;
  border-radius: 999px 999px 0 0;
  opacity: 0.92;
}

.current-heading {
  grid-area: heading;
  min-width: 0;
  align-self: end;
}

.current-heading h2 {
  margin: 0 0 0.35rem;
  font-size: 1.05rem;
  font-weight: 600;
  line-height: 1.35;
}

.meta-line {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin: 0;
  color: var(--ink-muted);
  font-size: 0.85rem;
}

.meta-line strong {
  color: var(--ink);
  font-weight: 600;
}

.player {
  grid-area: player;
  display: grid;
  gap: 0.55rem;
  min-width: 0;
  align-self: start;
}

.wave {
  height: 64px;
  width: 100%;
  border-radius: 12px;
  background: var(--wave-bg);
  overflow: hidden;
  cursor: pointer;
  touch-action: none;
}

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

.wave canvas {
  width: 100%;
  height: 64px;
  display: block;
}

.player-controls {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.play-btn {
  width: 2.4rem;
  height: 2.4rem;
  border-radius: 999px;
  border: 0;
  background: var(--accent);
  color: var(--on-accent);
  display: grid;
  place-items: center;
  cursor: pointer;
  flex-shrink: 0;
  padding: 0;
  font-size: 0.8rem;
  line-height: 1;
}

.play-btn:hover {
  background: var(--accent-hover);
}

.play-btn svg {
  display: block;
}

.time {
  color: var(--ink-muted);
  font-variant-numeric: tabular-nums;
  font-size: 0.85rem;
}

.volume-control {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  margin-left: auto;
  min-width: 0;
  color: var(--ink-muted);
}

.volume-control input[type="range"] {
  width: 7rem;
  max-width: 28vw;
  margin: 0;
  padding: 0;
  height: 1.25rem;
  border: none;
  background: transparent;
  accent-color: var(--accent);
  cursor: pointer;
}

.history-panel {
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: rgba(18, 17, 16, 0.72);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  overflow: hidden;
}

.tabs {
  display: flex;
  gap: 0.25rem;
  padding: 0.7rem 0.8rem 0;
  border-bottom: 1px solid var(--line);
}

.tabs button {
  border: 0;
  background: transparent;
  padding: 0.65rem 0.9rem;
  color: var(--ink);
  border-bottom: 2px solid var(--ink);
  font-weight: 600;
  font-family: inherit;
  font-size: 0.95rem;
  cursor: default;
}

.history-list {
  display: grid;
}

.history-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.85rem;
  align-items: center;
  padding: 0.9rem 1rem;
  border-bottom: 1px solid var(--line);
  text-align: left;
  background: transparent;
  width: 100%;
  cursor: pointer;
}

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

.history-item:hover,
.history-item.active {
  background: var(--row-hover);
}

.history-item > div {
  min-width: 0;
}

.history-item p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.4;
}

.history-item .sub {
  color: var(--ink-muted);
  font-size: 0.8rem;
  margin-top: 0.25rem;
}

.history-item .play-btn {
  width: 2.1rem;
  height: 2.1rem;
}

.demo-caption {
  margin: 0 0 2.2rem;
}

@media (max-width: 700px) {
  .current-card {
    grid-template-columns: 1fr;
    grid-template-areas:
      "head"
      "player";
    gap: 1rem;
  }

  .current-head {
    grid-area: head;
    display: flex;
    align-items: center;
    gap: 0.85rem;
    min-width: 0;
  }

  .art {
    width: 72px;
    height: 72px;
    border-radius: 12px;
  }

  .current-heading {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 0.3rem;
  }

  .current-heading h2 {
    margin: 0;
    font-size: 1rem;
  }
}

.spec-card h3 {
  margin: 0;
  font-size: 1.02rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.spec-card-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.45rem 0.7rem;
  margin: 0 0 0.7rem;
}

.spec-card-head h3 {
  margin: 0;
}

.spec-tag {
  margin: 0;
  color: var(--ink-muted);
  font-size: 0.82rem;
}

.specs {
  margin: 0;
}

.specs > div {
  display: grid;
  grid-template-columns: 5.5rem 1fr;
  gap: 0.7rem;
  padding: 0.55rem 0;
  border-bottom: 1px solid var(--line);
}

.specs > div:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.specs dt {
  margin: 0;
  color: var(--ink-muted);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

html[lang="ja"] .specs dt {
  letter-spacing: 0.06em;
  text-transform: none;
  font-size: 0.82rem;
}

.specs dd {
  margin: 0;
  font-size: 0.95rem;
}

.need-list,
.steps {
  margin: 0;
  padding: 0;
  list-style: none;
}

.need-list li,
.steps li {
  padding: 0.7rem 0;
  border-bottom: 1px solid var(--line);
}

.need-list li:last-child,
.steps li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.steps {
  counter-reset: launch;
}

.steps li {
  position: relative;
  padding-left: 2.4rem;
  counter-increment: launch;
}

.steps li::before {
  content: counter(launch);
  position: absolute;
  left: 0;
  top: 0.7rem;
  width: 1.5rem;
  height: 1.5rem;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--ink-muted);
  font-size: 0.75rem;
  font-weight: 600;
}

.cta-footer {
  display: flex;
  justify-content: flex-start;
  margin-top: 1.6rem;
}

footer {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 1.5rem 2.5rem;
}

footer p {
  margin: 0;
}

@media (max-width: 980px) {
  .site-chrome {
    position: sticky;
    top: 0;
    z-index: 10;
    background: var(--topbar-bg);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border-bottom: 1px solid var(--line);
  }

  .topbar {
    position: relative;
    top: auto;
    border-bottom: 0;
    background: transparent;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
  }

  .toc--mobile {
    display: block;
    width: 100%;
    max-width: 100%;
    min-width: 0;
    margin: 0;
    padding: 0.45rem 1.5rem 0.55rem;
    border: 0;
    background: transparent;
    box-sizing: border-box;
    overflow: hidden;
  }

  .toc--desktop {
    display: none;
  }

  .page-shell {
    grid-template-columns: minmax(0, 1fr);
    gap: 1.25rem;
    padding-top: 1.25rem;
    width: 100%;
    max-width: 100%;
    overflow-x: hidden;
  }

  .toc-list {
    display: flex;
    gap: 0.15rem;
    width: 100%;
    max-width: 100%;
    min-width: 0;
    margin: 0;
    padding: 0;
    overflow-x: auto;
    overflow-y: hidden;
    border-left: 0;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
    overscroll-behavior-x: contain;
    touch-action: pan-x;
    box-sizing: border-box;
  }

  .toc-list::-webkit-scrollbar {
    display: none;
  }

  .toc-list li {
    flex: 0 0 auto;
  }

  .toc-link {
    display: block;
    flex: 0 0 auto;
    padding: 0.4rem 0.75rem;
    border: 1px solid var(--line);
    border-radius: 999px;
    white-space: nowrap;
    font-size: 0.8rem;
  }

  .toc-link::before {
    display: none;
  }

  .toc-link.is-active {
    border-color: rgba(65, 221, 238, 0.45);
    background: rgba(65, 221, 238, 0.1);
    color: var(--accent-hover);
  }

  .topbar {
    overflow-x: hidden;
    max-width: 100%;
  }

  .topbar-inner,
  footer {
    max-width: 100%;
    min-width: 0;
    width: 100%;
    box-sizing: border-box;
  }

  .topbar-actions {
    flex-shrink: 1;
    min-width: 0;
    gap: 0.5rem;
  }

  .nav-link {
    font-size: 0.8rem;
  }

  .wordmark {
    font-size: 0.85rem;
    letter-spacing: 0.08em;
  }

  .brand-link {
    min-width: 0;
  }

  .player-controls {
    gap: 0.5rem;
    min-width: 0;
  }

  .volume-control input[type="range"] {
    width: 4.5rem;
    max-width: 22vw;
  }

  .page-shell,
  .topbar,
  .site-chrome,
  footer,
  main {
    max-width: 100%;
    overflow-x: hidden;
  }
}

@media (max-width: 980px) {
  .pricing-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 800px) {
  .feature-grid,
  .use-grid {
    grid-template-columns: 1fr;
  }

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

  .creator-photo {
    max-width: 12rem;
  }

  .specs > div {
    grid-template-columns: 1fr;
    gap: 0.2rem;
  }
}

@media (max-width: 560px) {
  .hero h1,
  html[lang="ja"] .hero h1 {
    font-size: 1.45rem;
  }

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

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