/* Reset & Base */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Noto Sans JP", "Meiryo", sans-serif;
  color: #333;
  background-color: #fefefe;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 24px;
}

a {
  color: #e07a8a;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* Header */
.header {
  text-align: center;
  padding: 64px 24px 32px;
  background: linear-gradient(135deg, #fff5f7 0%, #fff0e6 100%);
}

.logo {
  font-size: 2.4rem;
  font-weight: 700;
  color: #e07a8a;
  letter-spacing: 0.02em;
}

.tagline {
  margin-top: 8px;
  font-size: 1.1rem;
  color: #777;
}

/* Hero */
.hero {
  text-align: center;
  padding: 56px 24px;
  background-color: #fff;
}

.hero h2 {
  font-size: 1.6rem;
  font-weight: 700;
  color: #444;
  margin-bottom: 16px;
}

.hero p {
  font-size: 1.05rem;
  color: #666;
  line-height: 1.9;
}

/* Features */
.features {
  padding: 56px 24px;
  background-color: #fafafa;
}

.features h2 {
  text-align: center;
  font-size: 1.4rem;
  font-weight: 700;
  color: #444;
  margin-bottom: 36px;
}

.feature-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

@media (min-width: 600px) {
  .feature-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.feature-card {
  background: #fff;
  border-radius: 12px;
  padding: 32px 24px;
  text-align: center;
  border: 1px solid #f0e8e8;
}

.feature-icon {
  font-size: 2rem;
  margin-bottom: 12px;
}

.feature-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: #555;
  margin-bottom: 8px;
}

.feature-card p {
  font-size: 0.95rem;
  color: #777;
  line-height: 1.7;
}

/* AI Usage */
.ai-usage {
  padding: 56px 24px;
  background-color: #fff;
}

.ai-usage h2 {
  font-size: 1.4rem;
  font-weight: 700;
  color: #444;
  margin-bottom: 16px;
}

.ai-usage p {
  font-size: 1rem;
  color: #666;
  margin-bottom: 12px;
}

/* Target Users */
.target-users {
  padding: 56px 24px;
  background-color: #fafafa;
}

.target-users h2 {
  font-size: 1.4rem;
  font-weight: 700;
  color: #444;
  margin-bottom: 16px;
}

.target-users ul {
  list-style: none;
  padding: 0;
}

.target-users li {
  font-size: 1rem;
  color: #666;
  padding: 8px 0;
  padding-left: 20px;
  position: relative;
}

.target-users li::before {
  content: "•";
  position: absolute;
  left: 0;
  color: #e07a8a;
  font-weight: bold;
}

/* Privacy */
.privacy {
  padding: 56px 24px;
  background-color: #fff;
}

.privacy h2 {
  font-size: 1.4rem;
  font-weight: 700;
  color: #444;
  margin-bottom: 16px;
}

.privacy ul {
  list-style: none;
  padding: 0;
}

.privacy li {
  font-size: 0.95rem;
  color: #666;
  padding: 8px 0;
  padding-left: 20px;
  position: relative;
  line-height: 1.7;
}

.privacy li::before {
  content: "•";
  position: absolute;
  left: 0;
  color: #e07a8a;
  font-weight: bold;
}

/* Footer */
.footer {
  padding: 40px 24px;
  background-color: #f5f0f0;
  border-top: 1px solid #e8e0e0;
}

.footer-content {
  text-align: center;
}

.footer-service {
  font-size: 1.2rem;
  font-weight: 600;
  color: #e07a8a;
  margin-bottom: 8px;
}

.footer-info p {
  font-size: 0.9rem;
  color: #888;
  margin-bottom: 4px;
}

.copyright {
  margin-top: 20px;
  font-size: 0.8rem;
  color: #aaa;
}

/* Responsive */
@media (max-width: 599px) {
  .header {
    padding: 48px 16px 24px;
  }

  .logo {
    font-size: 2rem;
  }

  .hero h2 {
    font-size: 1.3rem;
  }

  .hero p {
    font-size: 0.95rem;
  }

  .features h2,
  .ai-usage h2,
  .target-users h2,
  .privacy h2 {
    font-size: 1.2rem;
  }
}