* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --indigo: #5B6DB5;
  --mint: #A0D8D0;
  --light-mint: #E8F5F3;
  --white: #FFFFFF;
  --gray-50: #F9FAFB;
  --gray-100: #F3F4F6;
  --gray-600: #4B5563;
  --gray-700: #374151;
  --gray-900: #111827;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans JP', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  line-height: 1.6;
  color: var(--gray-900);
  background-color: var(--white);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.header {
  background: linear-gradient(135deg, var(--indigo) 0%, #7B8DC9 100%);
  padding: 24px 0;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

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

.logo-icon {
  flex-shrink: 0;
}

.brand-name {
  font-size: 24px;
  font-weight: 600;
  color: var(--white);
  letter-spacing: -0.5px;
}

.hero {
  background: linear-gradient(135deg, var(--light-mint) 0%, var(--white) 100%);
  padding: 80px 0;
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
}

.hero-text {
  text-align: left;
}

.hero h1 {
  font-size: 42px;
  font-weight: 700;
  color: var(--indigo);
  line-height: 1.2;
  margin-bottom: 24px;
}

.hero-subtitle {
  font-size: 18px;
  color: var(--gray-700);
  margin-bottom: 32px;
  line-height: 1.6;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.hero-image {
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-img {
  width: 100%;
  max-width: 500px;
  height: auto;
  border-radius: 16px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
  object-fit: cover;
}

.btn {
  display: inline-block;
  padding: 16px 32px;
  font-size: 18px;
  font-weight: 600;
  text-decoration: none;
  border-radius: 12px;
  cursor: pointer;
  border: none;
}

.btn-primary {
  background-color: var(--indigo);
  color: var(--white);
}

.btn-primary:hover {
  background-color: #4A5C9E;
}

.btn-secondary {
  background-color: var(--mint);
  color: var(--gray-900);
}

.btn-secondary:hover {
  background-color: #8FC7BD;
}

.btn-outline {
  background-color: transparent;
  color: var(--indigo);
  border: 2px solid var(--indigo);
}

.btn-outline:hover {
  background-color: var(--indigo);
  color: var(--white);
}

.intro {
  padding: 80px 0;
  text-align: center;
  background-color: var(--white);
}

.intro h2 {
  font-size: 36px;
  font-weight: 700;
  color: var(--indigo);
  margin-bottom: 24px;
}

.intro p {
  font-size: 18px;
  color: var(--gray-700);
  max-width: 800px;
  margin: 0 auto;
  line-height: 1.8;
}

.features {
  padding: 80px 0;
  background-color: var(--gray-50);
}

.features h2 {
  font-size: 36px;
  font-weight: 700;
  color: var(--indigo);
  text-align: center;
  margin-bottom: 56px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 32px;
}

.feature-card {
  background: var(--white);
  padding: 40px 32px;
  border-radius: 16px;
  text-align: center;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
}

.feature-icon {
  margin-bottom: 24px;
  display: flex;
  justify-content: center;
}

.feature-card h3 {
  font-size: 22px;
  font-weight: 600;
  color: var(--indigo);
  margin-bottom: 16px;
}

.feature-card p {
  font-size: 16px;
  color: var(--gray-600);
  line-height: 1.5;
}

.platforms {
  padding: 80px 0;
  background: linear-gradient(135deg, var(--white) 0%, var(--light-mint) 100%);
}

.platforms-content {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 48px;
  align-items: center;
  max-width: 1000px;
  margin: 0 auto;
}

.platforms-img {
  width: 100%;
  height: 250px;
  border-radius: 16px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
  object-fit: cover;
}

.platforms-text {
  text-align: left;
}

.platforms h2 {
  font-size: 36px;
  font-weight: 700;
  color: var(--indigo);
  margin-bottom: 24px;
}

.platforms p {
  font-size: 18px;
  color: var(--gray-700);
  margin-bottom: 24px;
  line-height: 1.6;
}

.platform-badges {
  display: flex;
  justify-content: center;
  gap: 24px;
  flex-wrap: wrap;
}

.badge {
  background-color: var(--indigo);
  color: var(--white);
  padding: 12px 28px;
  border-radius: 24px;
  font-weight: 600;
  font-size: 16px;
}

.courses {
  padding: 80px 0;
  background-color: var(--white);
}

.courses h2 {
  font-size: 36px;
  font-weight: 700;
  color: var(--indigo);
  text-align: center;
  margin-bottom: 56px;
}

.course-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 32px;
}

.course-card {
  background: var(--white);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
  display: flex;
  flex-direction: column;
}

.course-img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.course-content {
  padding: 24px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.course-card h3 {
  font-size: 22px;
  font-weight: 600;
  color: var(--indigo);
  margin-bottom: 12px;
}

.course-card p {
  font-size: 16px;
  color: var(--gray-600);
  margin-bottom: 16px;
  line-height: 1.5;
  flex: 1;
}

.course-price {
  font-size: 28px;
  font-weight: 700;
  color: var(--indigo);
  margin-bottom: 16px;
}

.course-content .btn {
  width: 100%;
  text-align: center;
  font-size: 16px;
  padding: 12px 24px;
}

.privacy {
  padding: 80px 0;
  background-color: var(--gray-50);
  text-align: center;
}

.privacy h2 {
  font-size: 36px;
  font-weight: 700;
  color: var(--indigo);
  margin-bottom: 24px;
}

.privacy p {
  font-size: 18px;
  color: var(--gray-700);
  max-width: 800px;
  margin: 0 auto;
  line-height: 1.8;
}

.support {
  padding: 80px 0;
  background-color: var(--white);
}

.support h2 {
  font-size: 36px;
  font-weight: 700;
  color: var(--indigo);
  text-align: center;
  margin-bottom: 56px;
}

.support-options {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 32px;
}

.support-card {
  background: var(--gray-50);
  padding: 40px 32px;
  border-radius: 16px;
  text-align: center;
  border: 2px solid var(--mint);
}

.support-card h3 {
  font-size: 22px;
  font-weight: 600;
  color: var(--indigo);
  margin-bottom: 16px;
}

.support-card p {
  font-size: 16px;
  color: var(--gray-600);
  line-height: 1.5;
}

.cta {
  padding: 80px 0;
  text-align: center;
  background: linear-gradient(135deg, var(--indigo) 0%, #7B8DC9 100%);
  color: var(--white);
}

.cta h2 {
  font-size: 36px;
  font-weight: 700;
  margin-bottom: 24px;
  color: var(--white);
}

.cta p {
  font-size: 18px;
  max-width: 700px;
  margin: 0 auto 32px;
  line-height: 1.5;
}

.cta .btn-primary {
  background-color: var(--mint);
  color: var(--gray-900);
}

.cta .btn-primary:hover {
  background-color: #8FC7BD;
}

.contact {
  padding: 80px 0;
  background-color: var(--gray-50);
}

.contact h2 {
  font-size: 36px;
  font-weight: 700;
  color: var(--indigo);
  text-align: center;
  margin-bottom: 56px;
}

.contact-info {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 40px;
  max-width: 900px;
  margin: 0 auto;
}

.contact-item {
  text-align: center;
}

.contact-item h3 {
  font-size: 20px;
  font-weight: 600;
  color: var(--indigo);
  margin-bottom: 12px;
}

.contact-item a {
  color: var(--gray-700);
  text-decoration: none;
  font-size: 16px;
}

.contact-item a:hover {
  color: var(--indigo);
  text-decoration: underline;
}

.contact-item p {
  color: var(--gray-700);
  font-size: 16px;
  line-height: 1.5;
}

.footer {
  background-color: var(--gray-900);
  color: var(--white);
  padding: 56px 0 24px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 48px;
  margin-bottom: 40px;
}

.footer-about {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.footer-brand .brand-name {
  font-size: 18px;
  font-weight: 600;
}

.footer-description {
  color: var(--gray-100);
  font-size: 14px;
  line-height: 1.6;
}

.footer-nav h4,
.footer-legal h4,
.footer-contact h4 {
  color: var(--mint);
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 16px;
}

.footer-nav ul,
.footer-legal ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-nav li,
.footer-legal li {
  margin-bottom: 10px;
}

.footer-nav a,
.footer-legal a {
  color: var(--gray-100);
  text-decoration: none;
  font-size: 14px;
  transition: color 0.2s;
}

.footer-nav a:hover,
.footer-legal a:hover {
  color: var(--mint);
}

.footer-contact p {
  color: var(--gray-100);
  font-size: 14px;
  margin-bottom: 8px;
  line-height: 1.6;
}

.footer-contact a {
  color: var(--mint);
  text-decoration: none;
}

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

.footer-bottom {
  text-align: center;
  padding-top: 32px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
  color: var(--gray-100);
  font-size: 14px;
}

@media (max-width: 768px) {
  .hero-content {
    grid-template-columns: 1fr;
    gap: 32px;
  }

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

  .hero h1 {
    font-size: 32px;
  }

  .hero-subtitle {
    font-size: 16px;
  }

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

  .hero-img {
    max-width: 100%;
  }

  .platforms-content {
    grid-template-columns: 1fr;
  }

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

  .platforms-img {
    margin: 0 auto;
  }

  .intro h2,
  .features h2,
  .platforms h2,
  .courses h2,
  .privacy h2,
  .support h2,
  .cta h2,
  .contact h2 {
    font-size: 28px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
    text-align: center;
  }

  .footer-nav ul,
  .footer-legal ul {
    text-align: center;
  }
}