/* ホームページスタイル */
html {
  scroll-behavior: smooth;
}

.home-container {
  width: 100%;
  min-height: 100vh;
  background-color: var(--background-color);
  animation: fadeIn 0.4s ease;
}

/* ヒーローセクション */
.hero-section {
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-hover) 100%);
  color: var(--text-on-primary);
  padding: var(--spacing-2xl) var(--spacing-lg);
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  text-align: center;
  position: relative;
}

.hero-logo {
  position: absolute;
  top: var(--spacing-xl);
  left: var(--spacing-xl);
  height: 100px;
  width: auto;
  z-index: 10;
  opacity: 0;
  animation: fadeIn 0.6s ease-out 0.1s forwards;
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

.hero-login-btn {
  position: absolute;
  top: var(--spacing-xl);
  right: var(--spacing-xl);
  padding: 0.75rem 1.5rem;
  font-size: 16px;
  font-weight: 500;
  background-color: rgba(255, 255, 255, 0.2);
  color: var(--text-on-primary);
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: all var(--transition-base);
  backdrop-filter: blur(10px);
  z-index: 10;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  opacity: 0;
  animation: fadeIn 0.6s ease-out 0.1s forwards;
}

.hero-login-btn:hover {
  background-color: rgba(255, 255, 255, 0.3);
  border-color: rgba(255, 255, 255, 0.5);
  text-decoration: none;
  color: var(--text-on-primary);
  box-shadow: var(--shadow-md);
}

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

.hero-title {
  font-size: 48px;
  font-weight: 400;
  margin-bottom: var(--spacing-lg);
  letter-spacing: 0.02em;
}

.hero-subtitle {
  font-size: 30px;
  font-weight: 500;
  margin-bottom: var(--spacing-2xl);
  line-height: 1.8;
  opacity: 0.95;
}

.hero-subtitle-line {
  display: inline-block;
  opacity: 0;
  animation: fadeInUp 0.8s ease-out forwards;
}

.hero-subtitle-line:nth-of-type(1) {
  animation-delay: 0.2s;
}

.hero-subtitle-line:nth-of-type(2) {
  animation-delay: 0.8s;
}

.hero-subtitle-line:nth-of-type(3) {
  animation-delay: 1.4s;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero-actions {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  flex-wrap: wrap;
  opacity: 0;
  animation: fadeInUp 0.8s ease-out 2s forwards;
}

.btn-large {
  padding: 0.875rem 2rem;
  font-size: 16px;
  min-height: 44px;
}

/* 特徴セクション */
.features-section {
  padding: var(--spacing-2xl) var(--spacing-lg);
  background-color: var(--surface-color);
}

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

.section-title {
  font-size: 32px;
  font-weight: 400;
  text-align: center;
  margin-bottom: var(--spacing-2xl);
  color: var(--text-primary);
  letter-spacing: 0.01em;
  opacity: 0;
  animation: fadeInUp 0.6s ease-out forwards;
}

.features-section .section-title {
  animation-delay: 2.4s;
}

.how-it-works-section .section-title {
  animation-delay: 3.2s;
}

.cta-section .section-title {
  animation-delay: 4s;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-xl);
  margin-top: var(--spacing-xl);
}

.feature-card {
  background-color: var(--surface-color);
  padding: var(--spacing-xl);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-light);
  text-align: center;
  transition: all var(--transition-base);
  box-shadow: var(--shadow-sm);
  opacity: 0;
  animation: fadeInUp 0.6s ease-out forwards;
  will-change: transform, box-shadow;
}

.feature-card:nth-child(1) {
  animation-delay: 2.6s;
}

.feature-card:nth-child(2) {
  animation-delay: 2.8s;
}

.feature-card:nth-child(3) {
  animation-delay: 3s;
}

.feature-card:nth-child(4) {
  animation-delay: 3.2s;
}

.feature-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  border-color: var(--border-color);
}

.feature-icon {
  font-size: 48px;
  margin-bottom: var(--spacing-md);
  line-height: 1;
}

.feature-title {
  font-size: 20px;
  font-weight: 500;
  margin-bottom: var(--spacing-sm);
  color: var(--text-primary);
}

.feature-description {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* 使い方セクション */
.how-it-works-section {
  padding: var(--spacing-2xl) var(--spacing-lg);
  background-color: var(--background-color);
}

.steps-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-xl);
  margin-top: var(--spacing-xl);
}

.step-item {
  text-align: left;
  position: relative;
  opacity: 0;
  animation: fadeInUp 0.6s ease-out forwards;
  will-change: transform, opacity;
}

.step-item:nth-child(1) {
  animation-delay: 3.4s;
}

.step-item:nth-child(2) {
  animation-delay: 3.6s;
}

.step-item:nth-child(3) {
  animation-delay: 3.8s;
}

.step-item:nth-child(4) {
  animation-delay: 4s;
}

.step-number {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background-color: var(--primary-color);
  color: var(--text-on-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  font-weight: 500;
  margin: 0 auto var(--spacing-md);
  box-shadow: var(--shadow-md);
}

.step-title {
  text-align: center;
  font-size: 20px;
  font-weight: 500;
  margin-bottom: var(--spacing-sm);
  color: var(--text-primary);
}

.step-description {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* CTAセクション */
.cta-section {
  padding: var(--spacing-2xl) var(--spacing-lg);
  background: linear-gradient(135deg, var(--primary-light) 0%, var(--surface-color) 100%);
  text-align: center;
}

.cta-note {
  margin-top: var(--spacing-md);
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.6;
}

.cta-title {
  font-size: 32px;
  font-weight: 400;
  margin-bottom: var(--spacing-md);
  color: var(--text-primary);
  opacity: 0;
  animation: fadeInUp 0.6s ease-out 4.4s forwards;
}

.cta-description {
  font-size: 16px;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-xl);
  opacity: 0;
  animation: fadeInUp 0.6s ease-out 4.6s forwards;
}

.cta-actions {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  flex-wrap: wrap;
  opacity: 0;
  animation: fadeInUp 0.6s ease-out 4.8s forwards;
}

/* レスポンシブ対応 */
@media (max-width: 768px) {
  .hero-title {
    font-size: 36px;
  }

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

  .hero-logo {
    top: var(--spacing-lg);
    left: var(--spacing-lg);
    height: 80px;
  }

  .hero-login-btn {
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    padding: 0.625rem 1.25rem;
    font-size: 14px;
  }

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

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

  .hero-actions,
  .cta-actions {
    flex-direction: column;
  }

  .hero-actions .btn-large,
  .cta-actions .btn-large {
    width: 100%;
  }
}

@media (max-width: 480px) {
  .hero-section {
    padding: var(--spacing-xl) var(--spacing-md);
    min-height: 50vh;
  }

  .hero-logo {
    top: var(--spacing-md);
    left: var(--spacing-md);
    height: 60px;
  }

  .hero-login-btn {
    top: var(--spacing-md);
    right: var(--spacing-md);
    padding: 0.5rem 1rem;
    font-size: 14px;
    min-height: 40px;
  }

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

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

  .features-section,
  .how-it-works-section,
  .cta-section {
    padding: var(--spacing-xl) var(--spacing-md);
  }

  .section-title {
    font-size: 24px;
  }

  .feature-card,
  .step-item {
    padding: var(--spacing-lg);
  }
}