:root {
  --color-page-bg: #0a0a0c;
  --color-surface: #16161b;
  --color-surface-raised: #1c1c22;
  --color-border: #26262e;
  --color-text: #f2f2f5;
  --color-text-muted: #9a9aa5;
  --color-accent: #5b8def;
  --color-accent-strong: #7ba3f5;
  --color-accent-2: #a78bfa;
  --color-accent-2-strong: #d946ef;
  --color-positive: #4ade80;
  --color-negative: #f87171;
  --radius-card: 20px;
  --radius-control: 10px;
  --radius-pill: 999px;
  --max-width: 1080px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--color-page-bg);
  color: var(--color-text);
  font-family:
    -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Hiragino Kaku Gothic ProN', 'Hiragino Sans',
    Meiryo, sans-serif;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: inherit;
}

.wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

section {
  padding: 6rem 0;
}

/* ---------- hero frame ---------- */

.hero-wrap {
  padding: clamp(1rem, 3vw, 3rem);
  background:
    radial-gradient(circle at 15% 15%, rgba(255, 255, 255, 0.16) 0%, transparent 45%),
    linear-gradient(135deg, #4c63d8 0%, #6d4fd6 55%, #9a3fd1 100%);
}

.hero-frame {
  max-width: 1400px;
  margin: 0 auto;
  border-radius: 28px;
  overflow: hidden;
  background: #0a0a0d;
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 40px 100px -30px rgba(0, 0, 0, 0.6);
}

.frame-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.4rem 2rem;
  border-bottom: 1px solid var(--color-border);
}

.frame-nav__brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 700;
  font-size: 1.05rem;
  text-decoration: none;
  color: var(--color-text);
}

.frame-nav__brand img {
  width: 26px;
  height: 26px;
  border-radius: 7px;
}

.frame-nav__links {
  display: flex;
  align-items: center;
  gap: 1.75rem;
  font-size: 0.88rem;
  color: var(--color-text-muted);
}

.frame-nav__links a {
  text-decoration: none;
  transition: color 0.15s ease;
}

.frame-nav__links a:hover {
  color: var(--color-text);
}

.frame-nav__cta {
  padding: 0.5rem 1.1rem;
  border-radius: var(--radius-pill);
  background: var(--color-text);
  color: var(--color-page-bg);
  font-weight: 600;
  text-decoration: none;
  font-size: 0.85rem;
}

.hero-stage {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  align-items: center;
  gap: 2rem;
  padding: 3rem;
  min-height: 520px;
}

.hero-stage__art {
  position: relative;
  height: 460px;
}

.hero-code-panel {
  position: absolute;
  top: 0;
  left: 0;
  width: 300px;
  border-radius: var(--radius-control);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  overflow: hidden;
  box-shadow: 0 24px 50px -20px rgba(0, 0, 0, 0.5);
  z-index: 2;
}

.hero-code-panel__bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.55rem 0.9rem;
  font-size: 0.72rem;
  color: var(--color-text-muted);
  border-bottom: 1px solid var(--color-border);
  font-family: monospace;
}

.hero-code-panel__tag {
  padding: 0.1rem 0.5rem;
  border-radius: var(--radius-pill);
  background: color-mix(in srgb, var(--color-positive) 18%, transparent);
  color: var(--color-positive);
  font-size: 0.68rem;
}

.hero-code-panel__body {
  margin: 0;
  padding: 0.9rem 1rem 1.1rem;
  font-family: monospace;
  font-size: 0.72rem;
  line-height: 1.6;
  color: var(--color-text-muted);
  overflow-x: auto;
}

.tok-kw {
  color: var(--color-accent-strong);
}

.tok-fn {
  color: var(--color-text);
}

.tok-str {
  color: var(--color-positive);
}

.tok-cm {
  color: var(--color-text-muted);
  opacity: 0.6;
}

.hero-illustration {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  padding-right: 6%;
}

.hero-illustration__platform {
  width: 220px;
  height: 220px;
  border-radius: 32px;
  background: linear-gradient(160deg, var(--color-surface-raised), var(--color-surface));
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 30px 70px -20px rgba(0, 0, 0, 0.55);
}

.hero-illustration__platform img {
  width: 128px;
  height: 128px;
}

.hero-illustration__line {
  position: absolute;
  border: 1px dashed var(--color-border);
  z-index: 0;
}

.hero-illustration__line--a {
  width: 140px;
  top: 28%;
  right: 6%;
  transform: rotate(18deg);
}

.hero-illustration__line--b {
  width: 150px;
  bottom: 22%;
  left: 2%;
  transform: rotate(-14deg);
}

.hero-illustration__chip {
  position: absolute;
  padding: 0.4rem 0.85rem;
  border-radius: var(--radius-pill);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  font-family: monospace;
  font-size: 0.75rem;
  color: var(--color-text-muted);
  box-shadow: 0 14px 30px -14px rgba(0, 0, 0, 0.5);
}

.hero-illustration__chip--a {
  top: 18%;
  right: 2%;
}

.hero-illustration__chip--b {
  bottom: 12%;
  left: -2%;
}

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

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.9rem;
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text-muted);
  font-size: 0.8rem;
  margin-bottom: 1.5rem;
}

.hero-stage__copy h1 {
  font-size: clamp(2rem, 3.4vw, 2.7rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.25;
  margin: 0 0 1.1rem;
}

.hero-stage__subtitle {
  color: var(--color-text-muted);
  font-size: 1rem;
  margin: 0 0 2rem;
  max-width: 480px;
}

.hero-stage__ctas {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  flex-wrap: wrap;
}

/* ---------- buttons ---------- */

.button {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.8rem 1.6rem;
  border-radius: var(--radius-pill);
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition:
    transform 0.15s ease,
    filter 0.15s ease,
    background 0.15s ease;
}

.button:hover {
  transform: translateY(-1px);
}

.button--primary {
  background: linear-gradient(135deg, var(--color-accent-strong), var(--color-accent));
  color: #0a0a0c;
}

.button--primary:hover {
  filter: brightness(1.08);
}

.button--secondary {
  background: var(--color-surface);
  border-color: var(--color-border);
  color: var(--color-text);
}

.button--secondary:hover {
  background: var(--color-surface-raised);
}

.button--block {
  width: 100%;
  justify-content: center;
}

/* ---------- section heading ---------- */

.section__eyebrow {
  display: block;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent-strong);
  margin-bottom: 0.75rem;
}

.section__title {
  font-size: clamp(1.7rem, 3vw, 2.2rem);
  font-weight: 800;
  letter-spacing: -0.01em;
  margin: 0 0 0.75rem;
}

.section__desc {
  color: var(--color-text-muted);
  max-width: 620px;
  margin: 0 0 3rem;
}

.section__head--center {
  text-align: center;
}

.section__head--center .section__desc {
  margin-left: auto;
  margin-right: auto;
}

/* ---------- features ---------- */

.features {
  border-top: 1px solid var(--color-border);
}

.features__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
}

.feature-card {
  padding: 1.75rem;
  border-radius: var(--radius-card);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
}

.feature-card__icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-control);
  display: flex;
  align-items: center;
  justify-content: center;
  background: color-mix(in srgb, var(--color-accent) 16%, transparent);
  color: var(--color-accent-strong);
  margin-bottom: 1.1rem;
}

.feature-card__icon svg {
  width: 22px;
  height: 22px;
}

.feature-card h3 {
  font-size: 1.05rem;
  margin: 0 0 0.5rem;
}

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

/* ---------- screenshots ---------- */

.showcase {
  border-top: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  gap: 3rem;
}

.showcase-item {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.showcase-item:nth-child(even) .showcase-item__figure {
  order: 2;
}

.showcase-item__figure {
  border-radius: var(--radius-card);
  overflow: hidden;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
}

.showcase-item__eyebrow {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-accent-strong);
  margin-bottom: 0.6rem;
  display: block;
}

.showcase-item h3 {
  font-size: 1.4rem;
  margin: 0 0 0.75rem;
}

.showcase-item p {
  color: var(--color-text-muted);
  margin: 0;
}

/* ---------- download ---------- */

.download {
  border-top: 1px solid var(--color-border);
}

.download__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.download-card {
  padding: 1.75rem;
  border-radius: var(--radius-card);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  text-align: center;
}

.download-card__icon {
  width: 48px;
  height: 48px;
  margin: 0 auto 1rem;
  color: var(--color-text);
}

.download-card h3 {
  margin: 0 0 0.35rem;
  font-size: 1.05rem;
}

.download-card__meta {
  color: var(--color-text-muted);
  font-size: 0.82rem;
  margin: 0 0 1.25rem;
}

.download__note {
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.85rem;
  margin-top: 2rem;
}

.download__note a {
  color: var(--color-accent-strong);
  text-decoration: none;
}

/* ---------- install ---------- */

.install {
  border-top: 1px solid var(--color-border);
}

.install__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

.install-card {
  padding: 1.75rem;
  border-radius: var(--radius-card);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
}

.install-card h3 {
  margin: 0 0 1rem;
  font-size: 1.05rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.install-card ol {
  margin: 0;
  padding-left: 1.2rem;
  color: var(--color-text-muted);
  font-size: 0.92rem;
}

.install-card li {
  margin-bottom: 0.65rem;
}

.install-card li:last-child {
  margin-bottom: 0;
}

.install-card strong {
  color: var(--color-text);
}

.install-note {
  margin-top: 1.25rem;
  padding: 0.9rem 1rem;
  border-radius: var(--radius-control);
  background: color-mix(in srgb, var(--color-accent) 10%, transparent);
  border: 1px solid color-mix(in srgb, var(--color-accent) 25%, transparent);
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

/* ---------- privacy ---------- */

.privacy {
  border-top: 1px solid var(--color-border);
}

.privacy__panel {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1.75rem;
  align-items: center;
  padding: 2.25rem;
  border-radius: var(--radius-card);
  background: linear-gradient(
    135deg,
    color-mix(in srgb, var(--color-accent) 12%, var(--color-surface)),
    color-mix(in srgb, var(--color-accent-2-strong) 10%, var(--color-surface))
  );
  border: 1px solid var(--color-border);
}

.privacy__icon {
  width: 56px;
  height: 56px;
  border-radius: 16px;
  background: var(--color-surface-raised);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-positive);
}

.privacy__icon svg {
  width: 28px;
  height: 28px;
}

.privacy__panel h3 {
  margin: 0 0 0.4rem;
  font-size: 1.1rem;
}

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

/* ---------- faq ---------- */

.faq {
  border-top: 1px solid var(--color-border);
}

.faq__list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.faq-item {
  padding: 1.4rem 1.6rem;
  border-radius: var(--radius-control);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
}

.faq-item h3 {
  margin: 0 0 0.5rem;
  font-size: 0.98rem;
}

.faq-item p {
  margin: 0;
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

/* ---------- footer ---------- */

.footer {
  border-top: 1px solid var(--color-border);
  padding: 2.5rem 0;
}

.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.footer__links {
  display: flex;
  gap: 1.25rem;
}

.footer__links a {
  color: var(--color-text-muted);
  text-decoration: none;
}

.footer__links a:hover {
  color: var(--color-text);
}

/* ---------- responsive ---------- */

@media (max-width: 760px) {
  section {
    padding: 3.5rem 0;
  }

  .frame-nav__links {
    display: none;
  }

  .hero-stage {
    grid-template-columns: 1fr;
    padding: 2rem 1.25rem;
  }

  .hero-stage__art {
    height: 300px;
    order: 2;
  }

  .hero-code-panel {
    width: 220px;
  }

  .hero-illustration__platform {
    width: 150px;
    height: 150px;
    border-radius: 24px;
  }

  .hero-illustration__platform img {
    width: 88px;
    height: 88px;
  }

  .hero-stage__copy {
    order: 1;
    text-align: center;
  }

  .hero-stage__subtitle {
    max-width: none;
    margin-left: auto;
    margin-right: auto;
  }

  .hero-stage__ctas {
    justify-content: center;
  }

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

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

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

  .showcase-item {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .showcase-item:nth-child(even) .showcase-item__figure {
    order: 0;
  }

  .privacy__panel {
    grid-template-columns: 1fr;
    text-align: center;
    justify-items: center;
  }

  .nav__links {
    display: none;
  }
}