html, body,
ul, ol, li,
h1, h2, h3, h4, h5, h6, p, div {
  margin: 0;
  padding: 0;
}

body {
  background-color: #F7F7F7;
  font-family: "Exo 2", "Noto Sans JP", system-ui, -apple-system, sans-serif;
  color: #222;
}

a {
  color: inherit;
}

header {
  width: 100%;
  height: 64px;
  background-color: rgba(30, 30, 30, 0.9);
  position: fixed;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-sizing: border-box;
  padding: 0 24px;
}

.header-left {
  display: flex;
  align-items: center;
  font-size: 20px;
  font-weight: 700;
  color: #fff;
}

.header-left img {
  height: 40px;
  margin-right: 12px;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 16px;
}

.header-right a {
  font-size: 15px;
  text-decoration: none;
  color: #fff;
  padding: 8px 12px;
  border-radius: 6px;
  transition: background-color 0.2s ease;
}

.header-right a:hover,
.header-right a:focus {
  background-color: rgba(255, 255, 255, 0.12);
}

.content {
  margin-top: 90px;
  padding: 0 5% 40px 5%;
}

.main-frame {
  background-color: #FFFFFF;
  border-radius: 16px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.06);
  overflow: hidden;
}

.inner-frame {
  padding: 32px 8% 40px 8%;
}

.section {
  margin-bottom: 48px;
}

.section-title {
  text-align: center;
  font-size: 30px;
  color: #F9A825;
  margin-bottom: 12px;
  letter-spacing: 0.5px;
}

.section-lead {
  text-align: center;
  font-size: 17px;
  line-height: 1.7;
  color: #444;
  max-width: 840px;
  margin: 0 auto 24px auto;
}

.hero {
  background: linear-gradient(135deg, #FFF3E0 0%, #E8F5E9 100%);
  border-radius: 14px;
  padding: 32px;
  margin-bottom: 32px;
}

.hero-header {
  display: flex;
  gap: 18px;
  align-items: center;
  flex-wrap: wrap;
}

.hero h1 {
  font-size: 32px;
  margin-bottom: 12px;
  color: #1F2933;
}

.hero p {
  font-size: 18px;
  line-height: 1.8;
  color: #2F343C;
}

.highlight-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
  margin-top: 16px;
}

.highlight-item {
  background-color: #fff;
  border: 1px solid #E5E7EB;
  border-radius: 12px;
  padding: 16px;
  line-height: 1.6;
}

.highlight-item h4 {
  font-size: 16px;
  margin-bottom: 6px;
}

.app-card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}

.app-card {
  border: 1px solid #E5E7EB;
  border-radius: 14px;
  padding: 20px;
  background-color: #fff;
  display: flex;
  flex-direction: column;
  gap: 12px;
  box-shadow: 0 4px 18px rgba(0, 0, 0, 0.04);
}

.app-card-header {
  display: flex;
  gap: 14px;
  align-items: center;
}

.app-icon {
  width: 64px;
  height: 64px;
  border-radius: 14px;
  border: 1px solid #E5E7EB;
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.08);
  object-fit: cover;
  background: #fff;
}

.app-card h3 {
  font-size: 22px;
  color: #1F2933;
}

.app-card p {
  font-size: 16px;
  line-height: 1.7;
  color: #424C55;
}

.app-meta {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.tag {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 9999px;
  background-color: #F3F4F6;
  color: #374151;
  font-size: 13px;
  font-weight: 600;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

.button {
  display: inline-block;
  padding: 10px 16px;
  border-radius: 10px;
  text-decoration: none;
  font-weight: 700;
  font-size: 15px;
  border: 1px solid transparent;
  transition: all 0.2s ease;
}

.button.primary {
  background-color: #F9A825;
  color: #1F2933;
  border-color: #F9A825;
}

.button.primary:hover,
.button.primary:focus {
  background-color: #F57C00;
  color: #fff;
}

.button.secondary {
  background-color: #fff;
  color: #1F2933;
  border-color: #D1D5DB;
}

.button.secondary:hover,
.button.secondary:focus {
  background-color: #F3F4F6;
}

.small-note {
  font-size: 13px;
  color: #6B7280;
}

.subtitle {
  margin: 20px 0px 12px 0px;
}

.subtitle h2 {
  text-align: center;
  padding-bottom: 10px;
  padding-top: 10px;
  font-size: 26px;
  color: #F9A825;
  border-bottom: 1px solid #E5E7EB;
}

.description-text {
  font-size: 17px;
  line-height: 1.8;
  color: #2D3748;
}

.description-text h3,
.description-text h4 {
  margin-top: 20px;
  font-weight: bold;
  color: #1F2933;
}

.description-text p {
  margin-bottom: 10px;
}

.summary {
  text-align: center;
}

.summary p {
  font-size: 17px;
  line-height: 1.7;
}

#icon {
  max-width: 160px;
  height: auto;
  margin: 20px auto;
  display: block;
}

.download-link {
  display: flex;
  gap: 12px;
  justify-content: center;
  margin-top: 10px;
}

.download-link a {
  text-decoration: none;
}

.download-link img {
  height: 60px;
  border-style: none;
}

.screenshot {
  text-align: center;
  margin: 20px 0px;
}

.screenshot img {
  width: 260px;
  max-width: 100%;
  margin: 8px;
}

footer {
  text-align: center;
  padding: 18px 0 10px 0;
  font-size: 14px;
  color: #4B5563;
}

footer a {
  color: #F9A825;
  font-weight: 700;
  text-decoration: none;
}

footer a:hover {
  text-decoration: underline;
}

@media screen and (max-width: 768px) {
  .content {
    padding: 0 16px 32px 16px;
  }

  .inner-frame {
    padding: 24px 6% 32px 6%;
  }

  .hero h1 {
    font-size: 28px;
  }

  .header-right {
    display: none;
  }
}