* {
  box-sizing: border-box;
}

body {
  font-family: "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Yu Gothic Medium",
    "Meiryo", "MS PGothic", sans-serif;
  margin: 0;
  padding: 0;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: #333;
  line-height: 1.7;
}

/* Header */
.header {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  padding: 12px 0;
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo-section {
  display: flex;
  align-items: center;
  gap: 16px;
}

.logo-icon {
  width: 60px;
  height: 60px;
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.logo-text {
  font-size: 24px;
  font-weight: bold;
  color: #2c3e50;
  margin: 0;
}

.nav-links {
  display: flex;
  gap: 24px;
  align-items: center;
}

.nav-link {
  color: #2c3e50;
  text-decoration: none;
  font-weight: 500;
  padding: 8px 16px;
  border-radius: 8px;
  transition: all 0.3s ease;
}

.nav-link:hover {
  background: rgba(102, 126, 234, 0.1);
  color: #667eea;
}

/* Hero Section */
.hero {
  background: white;
  padding: 0;
  text-align: center;
  position: relative;
  width: 100%;
  overflow: hidden;
}

.hero-content {
  width: 100%;
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero picture {
  display: block;
  width: 100%;
  line-height: 0;
}

.hero-main-image {
  width: 100%;
  height: auto;
  display: block;
}

/* PC表示時の調整 */
@media (min-width: 769px) {
  .hero {
    overflow: hidden;
  }

  .hero-main-image {
    width: 100%;
    height: auto;
  }
}

.hero h1 {
  font-size: 48px;
  margin: 0 0 24px;
  font-weight: 700;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.hero-subtitle {
  font-size: 24px;
  margin: 0 0 16px;
  opacity: 0.9;
  font-weight: 300;
}

.hero-description {
  font-size: 18px;
  margin: 0 0 40px;
  opacity: 0.8;
}

.app-store-button {
  display: inline-block;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  line-height: 0;
  border-radius: 12px;
  overflow: hidden;
}

.app-store-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
}

.app-store-button img {
  width: 200px;
  height: auto;
  border-radius: 12px;
  display: block;
}

/* Main Content */
.main-content {
  background: white;
  position: relative;
  z-index: 10;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 80px 20px;
}

/* Remove space between hero and first section */
.app-description.section {
  margin-top: -80px;
  padding-top: 40px;
}

/* App Description Section */
.app-description {
  text-align: center;
  margin-bottom: 40px;
}

.description-content h2 {
  font-size: 36px;
  color: #2c3e50;
  margin: 0 !important;
  padding: 0 !important;
  font-weight: 600;
}

/* Description Text Content */
.description-text-content {
  margin: 5px 0 40px 0;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.description-paragraph {
  font-size: 16px;
  color: #666;
  line-height: 1.8;
  margin: 0 0 20px;
  text-align: left;
}

.description-lead {
  font-size: 22px;
  font-weight: 400;
  color: #666;
}

.description-paragraph:last-child {
  margin-bottom: 0;
}

.app-store-section {
  margin-top: 50px;
}

/* Features Section */
.features {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 40px;
  margin: 60px 0;
}

.feature-card {
  background: white;
  padding: 40px;
  border-radius: 16px;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
  text-align: center;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  border: 1px solid rgba(102, 126, 234, 0.1);
}

.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
}

.feature-icon {
  width: 80px;
  height: 80px;
  background: linear-gradient(135deg, #667eea, #764ba2);
  border-radius: 50%;
  margin: 0 auto 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 36px;
  color: white;
}

.feature-card h3 {
  font-size: 24px;
  margin: 0 0 16px;
  color: #2c3e50;
  font-weight: 600;
}

.feature-card p {
  font-size: 16px;
  color: #666;
  margin: 0;
}

/* Sections */
.section {
  margin: 80px 0;
}

.section h2 {
  font-size: 36px;
  text-align: center;
  margin: 0 0 60px;
  color: #2c3e50;
  position: relative;
  font-weight: 700;
}

.use-cases {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 30px;
  margin: 40px 0;
}

.use-case-modern {
  background: white;
  border-radius: 16px;
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.08);
  overflow: hidden;
  transition: all 0.3s ease;
  border: 1px solid rgba(102, 126, 234, 0.1);
}

.use-case-modern:hover {
  transform: translateY(-5px);
  box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
}

.use-case-header {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  padding: 25px;
  color: white;
  display: flex;
  align-items: center;
  gap: 15px;
}

.use-case-icon {
  font-size: 28px;
  width: 50px;
  height: 50px;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(10px);
}

.use-case-header h3 {
  margin: 0;
  font-size: 20px;
  font-weight: 600;
}

.use-case-body {
  padding: 25px;
}

.use-case-body p {
  color: #666;
  margin: 0 0 20px;
  font-size: 15px;
  line-height: 1.6;
}

.use-case-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag {
  background: #f0f2ff;
  color: #667eea;
  padding: 6px 12px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 500;
  border: 1px solid rgba(102, 126, 234, 0.2);
}

.target-users {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
  margin: 40px 0;
}

.user-tag {
  background: linear-gradient(135deg, #667eea, #764ba2);
  color: white;
  padding: 12px 24px;
  border-radius: 25px;
  font-size: 16px;
  font-weight: 500;
  box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
  transition: transform 0.3s ease;
}

.user-tag:hover {
  transform: translateY(-2px);
}

/* Footer */
.footer {
  background: #2c3e50;
  color: white;
  padding: 60px 20px 40px;
  text-align: center;
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
}

.footer-logo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 30px;
}

.footer-logo img {
  width: 50px;
  height: 50px;
  border-radius: 10px;
}

.footer-logo h3 {
  font-size: 24px;
  margin: 0;
  font-weight: 600;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 30px;
  margin: 30px 0;
  flex-wrap: wrap;
}

.footer-link {
  color: #bdc3c7;
  text-decoration: none;
  font-size: 16px;
  transition: color 0.3s ease;
}

.footer-link:hover {
  color: #667eea;
}

.footer-bottom {
  border-top: 1px solid #34495e;
  padding-top: 30px;
  margin-top: 40px;
  color: #95a5a6;
  font-size: 14px;
}

/* Responsive */
@media (max-width: 1024px) {
  .features {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .header-content {
    flex-direction: column;
    gap: 20px;
  }

  .nav-links {
    flex-wrap: wrap;
    justify-content: center;
  }

  .hero-content {
    width: 100%;
  }

  .hero h1 {
    font-size: 36px;
  }

  .hero-subtitle {
    font-size: 20px;
  }

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

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

  .use-case-modern {
    min-width: auto;
  }

  .container {
    padding: 40px 20px;
  }

  .app-description.section {
    margin-top: -40px;
    padding-top: 20px;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 28px;
  }

  .hero-subtitle {
    font-size: 18px;
  }

  .section h2 {
    font-size: 28px;
  }

  .app-store-button img {
    width: 160px;
  }
}