:root {
  --bg: #f3f5f4;
  --surface: #ffffff;
  --text: #0f1411;
  --muted: #5f6b64;
  --primary: #1d8b57;
  --primary-dark: #166d43;
  --line: #e1e6e2;
  --shadow: 0 10px 26px rgba(12, 22, 16, 0.06);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: "Hiragino Kaku Gothic ProN", "Yu Gothic", "Meiryo", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.75;
}

img {
  max-width: 100%;
  height: auto;
}

.container {
  width: min(1040px, 92vw);
  margin: 0 auto;
}

.site-header {
  background: transparent;
  padding-top: 18px;
}

.site-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  text-decoration: none;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.brand-icon {
  width: 30px;
  height: 30px;
  border-radius: 8px;
}

.play-badge-link {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
}

.play-badge {
  display: block;
  width: auto;
  height: 54px;
}

.play-badge-link:focus-visible {
  outline: 2px solid #8dbfa6;
  outline-offset: 3px;
}

.hero {
  padding-top: 18px;
  padding-bottom: 32px;
}

.hero-inner {
  background: linear-gradient(160deg, #f8fbf9 0%, #f1f6f3 100%);
  border: 1px solid var(--line);
  border-radius: 28px;
  box-shadow: var(--shadow);
  padding: 56px 52px;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 32px;
  align-items: center;
}

h1 {
  margin: 0;
  font-size: clamp(1.65rem, 3.6vw, 2.35rem);
  line-height: 1.2;
  font-weight: 600;
  letter-spacing: -0.015em;
}

.hero-copy {
  margin: 18px 0 0;
  max-width: 520px;
  font-size: 1.03rem;
  color: var(--muted);
}

.play-badge-hero {
  margin-top: 30px;
}

.hero-visual {
  min-height: 340px;
  display: grid;
  place-items: center;
  padding: 0;
}

.hero-visual img {
  width: min(100%, 560px);
  height: auto;
  display: block;
  filter: drop-shadow(0 18px 36px rgba(12, 22, 16, 0.16));
}

.section {
  padding: 78px 0;
}

.section-alt {
  background: transparent;
}

h2 {
  margin: 0 0 28px;
  font-size: clamp(1.45rem, 3vw, 1.9rem);
  line-height: 1.3;
  letter-spacing: -0.01em;
}

.grid {
  display: grid;
  gap: 14px;
}

.cards {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.use-cases {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.card,
.panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 22px;
}

.feature-icon {
  width: 26px;
  height: 26px;
  display: block;
  object-fit: contain;
  filter: invert(51%) sepia(60%) saturate(531%) hue-rotate(73deg) brightness(96%) contrast(90%);
  margin-bottom: 10px;
}

.card h3,
.panel h3 {
  margin: 0 0 9px;
  font-size: 1.05rem;
  line-height: 1.45;
}

.card p,
.panel p {
  margin: 0;
  color: var(--muted);
}

.faq-list {
  display: grid;
  gap: 12px;
}

details {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 13px 15px;
}

summary {
  cursor: pointer;
  font-weight: 600;
}

details p {
  margin: 8px 0 0;
  color: var(--muted);
}

.footer {
  background: transparent;
  color: var(--muted);
  padding: 14px 0 40px;
}

.footer-inner {
  display: grid;
  gap: 14px;
  border-top: 1px solid var(--line);
  padding-top: 26px;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.footer a {
  color: #2f3c35;
  text-decoration: none;
}

.footer a:hover,
.footer a:focus {
  text-decoration: underline;
}

.copyright {
  margin: 0;
  font-size: 0.9rem;
  color: #7a8780;
}

@media (max-width: 900px) {
  .hero-inner {
    grid-template-columns: 1fr;
    padding: 42px 24px;
    gap: 22px;
  }

  .hero-visual {
    min-height: auto;
    padding-top: 4px;
  }

  .cards,
  .use-cases {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .hero {
    padding-top: 12px;
    padding-bottom: 24px;
  }

  .site-header {
    padding-top: 12px;
  }

  .brand {
    font-size: 0.95rem;
  }

  .hero-inner {
    border-radius: 20px;
    padding: 34px 18px;
  }

  h1 {
    font-size: clamp(1.9rem, 9vw, 2.5rem);
  }

  .section {
    padding: 52px 0;
  }

  .play-badge-hero .play-badge {
    height: 52px;
  }

}