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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", "Hiragino Sans", "Hiragino Kaku Gothic ProN", Arial, "Yu Gothic", Meiryo, sans-serif;
  line-height: 1.8;
  color: #333;
  background: #fff;
}

/* Hero Section */
.hero-section {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  overflow: hidden;
}

.hero-bg-pattern {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0.1;
  background-image:
    repeating-linear-gradient(45deg, transparent, transparent 35px, rgba(255, 255, 255, .1) 35px, rgba(255, 255, 255, .1) 70px),
    repeating-linear-gradient(-45deg, transparent, transparent 35px, rgba(255, 255, 255, .05) 35px, rgba(255, 255, 255, .05) 70px);
}

.hero-content {
  position: relative;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  color: white;
  text-align: center;
  z-index: 1;
}

.hero-badge {
  display: inline-block;
  padding: 8px 20px;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 30px;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 20px;
  backdrop-filter: blur(10px);
}

.hero-title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
  margin-bottom: 20px;
  line-height: 1.2;
  animation: fadeInUp 0.8s ease-out;
}

.hero-subtitle {
  font-size: clamp(1.1rem, 2.5vw, 1.4rem);
  opacity: 0.95;
  margin-bottom: 40px;
  animation: fadeInUp 0.8s ease-out 0.2s both;
}

.hero-cta {
  display: inline-block;
  padding: 18px 40px;
  background: white;
  color: #667eea;
  text-decoration: none;
  border-radius: 50px;
  font-weight: 600;
  font-size: 16px;
  transition: all 0.3s ease;
  animation: fadeInUp 0.8s ease-out 0.4s both;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.hero-cta:hover {
  transform: translateY(-3px);
  box-shadow: 0 15px 40px rgba(0, 0, 0, 0.3);
}

/* Main Content */
.main-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 80px 20px;
}

/* Problem Section */
.problem-section {
  margin-bottom: 100px;
}

.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-label {
  display: inline-block;
  padding: 6px 16px;
  background: linear-gradient(135deg, #667eea, #764ba2);
  color: white;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.05em;
  margin-bottom: 15px;
}

.section-title {
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: 700;
  color: #1a1a1a;
  margin-bottom: 15px;
  line-height: 1.3;
}

.problem-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
  margin-top: 40px;
}

.problem-card {
  background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
  padding: 30px;
  border-radius: 20px;
  position: relative;
  overflow: hidden;
  transition: transform 0.3s ease;
}

.problem-card:hover {
  transform: translateY(-5px);
}

.problem-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: linear-gradient(180deg, #667eea, #764ba2);
}

.problem-icon {
  width: 50px;
  height: 50px;
  background: white;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  font-size: 24px;
}

.problem-title {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 10px;
  color: #2d3748;
}

.problem-text {
  color: #4a5568;
  line-height: 1.6;
}

/* Solution Section */
.solution-section {
  background: linear-gradient(135deg, #fafafa 0%, #f0f0f0 100%);
  padding: 80px 20px;
  margin: 0 -20px;
  position: relative;
}

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

.solution-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  margin-top: 50px;
}

@media (max-width: 768px) {
  .solution-grid {
    grid-template-columns: 1fr;
  }
}

.solution-text h3 {
  font-size: 2rem;
  margin-bottom: 20px;
  background: linear-gradient(135deg, #667eea, #764ba2);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.solution-features {
  display: grid;
  gap: 20px;
  margin-top: 30px;
}

.feature-item {
  display: flex;
  align-items: start;
  gap: 15px;
}

.feature-icon {
  width: 30px;
  height: 30px;
  background: linear-gradient(135deg, #667eea, #764ba2);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  flex-shrink: 0;
}

.feature-text {
  flex: 1;
}

.feature-text strong {
  display: block;
  margin-bottom: 5px;
  color: #2d3748;
}

/* Roadmap Section */
.roadmap-section {
  padding: 100px 20px;
  background: white;
}

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

.roadmap-intro {
  text-align: center;
  max-width: 800px;
  margin: 0 auto 60px;
}

.roadmap-phases {
  display: grid;
  gap: 40px;
  position: relative;
}

.roadmap-phase {
  background: white;
  border: 2px solid #e2e8f0;
  border-radius: 20px;
  padding: 40px;
  position: relative;
  transition: all 0.3s ease;
}

.roadmap-phase:hover {
  border-color: #667eea;
  box-shadow: 0 10px 40px rgba(102, 126, 234, 0.1);
}

.phase-header {
  display: flex;
  align-items: center;
  gap: 20px;
  margin-bottom: 30px;
}

.phase-number {
  width: 60px;
  height: 60px;
  background: linear-gradient(135deg, #667eea, #764ba2);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 700;
  font-size: 24px;
}

.phase-title {
  flex: 1;
}

.phase-title h3 {
  font-size: 1.5rem;
  margin-bottom: 5px;
  color: #2d3748;
}

.phase-duration {
  color: #667eea;
  font-weight: 600;
}

.tech-stack {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.tech-tag {
  padding: 8px 16px;
  background: linear-gradient(135deg, #edf2f7, #e2e8f0);
  border-radius: 20px;
  font-size: 14px;
  font-weight: 500;
  color: #4a5568;
  transition: all 0.3s ease;
}

.tech-tag:hover {
  background: linear-gradient(135deg, #667eea, #764ba2);
  color: white;
  transform: translateY(-2px);
}

/* Learning Method Section */
.method-section {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  padding: 80px 20px;
  color: white;
  position: relative;
  overflow: hidden;
}

.method-content {
  max-width: 1000px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.method-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 40px;
  margin-top: 50px;
}

.method-card {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  padding: 30px;
  border-radius: 20px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  text-align: center;
  transition: all 0.3s ease;
}

.method-card:hover {
  background: rgba(255, 255, 255, 0.15);
  transform: translateY(-5px);
}

.method-icon {
  font-size: 48px;
  margin-bottom: 20px;
}

.method-title {
  font-size: 1.3rem;
  margin-bottom: 15px;
}

/* CTA Section */
.cta-section {
  padding: 100px 20px;
  background: white;
  text-align: center;
}

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

.cta-title {
  font-size: clamp(2rem, 4vw, 3rem);
  margin-bottom: 20px;
  background: linear-gradient(135deg, #667eea, #764ba2);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.cta-text {
  font-size: 1.2rem;
  color: #4a5568;
  margin-bottom: 40px;
}

.cta-buttons {
  display: flex;
  gap: 20px;
  justify-content: center;
  flex-wrap: wrap;
}

.cta-button {
  display: inline-block;
  padding: 18px 40px;
  background: linear-gradient(135deg, #667eea, #764ba2);
  color: white;
  text-decoration: none;
  border-radius: 50px;
  font-weight: 600;
  transition: all 0.3s ease;
  box-shadow: 0 10px 30px rgba(102, 126, 234, 0.3);
}

.cta-button:hover {
  transform: translateY(-3px);
  box-shadow: 0 15px 40px rgba(102, 126, 234, 0.4);
}

.cta-button-secondary {
  background: white;
  color: #667eea;
  border: 2px solid #667eea;
  box-shadow: none;
}

.cta-button-secondary:hover {
  background: #667eea;
  color: white;
}

/* Animations */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.8s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}