:root {
  /* Colors */
  --primary: #D97706;
  --primary-light: #F59E0B;
  --secondary: #1E293B;
  --dark: #0F172A;
  --light: #F8FAFC;
  --text: #334155;
  --text-light: #64748B;
  --white: #FFFFFF;
  
  /* Gradation */
  --grad-sun: linear-gradient(135deg, #F59E0B 0%, #D97706 100%);
  --grad-flow: linear-gradient(180deg, rgba(255,255,255,0) 0%, rgba(248,250,252,1) 100%);

  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 4rem;
  --space-xl: 8rem;
}

html {
  scroll-behavior: smooth;
}

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

body {
  font-family: 'Inter', 'Noto Sans JP', sans-serif;
  color: var(--text);
  background-color: var(--light);
  line-height: 1.6;
  overflow-x: hidden;
}

h1, h2, h3 {
  color: var(--secondary);
  line-height: 1.2;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-sm);
}

/* Sections */
section {
  padding: var(--space-lg) 0;
}

/* Hero Section */
.hero {
  min-height: 90vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  background: var(--dark);
  color: var(--white);
  position: relative;
  overflow: hidden;
}

.hero::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at center, rgba(217, 119, 6, 0.1) 0%, transparent 70%);
}

.hero-content {
  position: relative;
  z-index: 10;
}

.hero-tagline {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--primary-light);
  margin-bottom: var(--space-sm);
  letter-spacing: 0.2rem;
}

.hero-title {
  font-size: clamp(2.5rem, 8vw, 4.5rem);
  margin-bottom: var(--space-md);
  font-weight: 800;
}

.hero-desc {
  font-size: 1.1rem;
  color: var(--text-light);
  max-width: 600px;
  margin: 0 auto var(--space-md);
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 1.2rem 2.5rem;
  border-radius: 999px;
  font-weight: 700;
  text-decoration: none;
  transition: all 0.3s ease;
  cursor: pointer;
}

.btn-primary {
  background: var(--grad-sun);
  color: var(--white);
  box-shadow: 0 10px 20px rgba(217, 119, 6, 0.3);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 15px 30px rgba(217, 119, 6, 0.4);
}

/* Sections Common */
.section-title {
  font-size: 2.5rem;
  text-align: center;
  margin-bottom: var(--space-lg);
  font-weight: 800;
}

.section-accent {
  color: var(--primary);
  display: block;
  font-size: 1rem;
  letter-spacing: 0.1em;
  margin-bottom: 0.5rem;
}

/* Problem Section */
.problem {
  background: var(--white);
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-md);
}

.card {
  padding: var(--space-md);
  background: var(--light);
  border-radius: 1rem;
  transition: transform 0.3s ease;
}

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

.card h3 {
  margin-bottom: var(--space-sm);
  color: var(--primary);
}

/* Method Section */
.method {
  background: var(--secondary);
  color: var(--white);
}

.method .section-title {
  color: var(--white);
}

.method-item {
  display: flex;
  align-items: flex-start;
  margin-bottom: var(--space-md);
  background: rgba(255, 255, 255, 0.05);
  padding: var(--space-md);
  border-radius: 1rem;
  border-left: 4px solid var(--primary);
}

.method-number {
  font-size: 2rem;
  font-weight: 900;
  color: var(--primary);
  margin-right: var(--space-md);
  line-height: 1;
}

/* Profile Section */
.profile {
  background: var(--light);
}

.profile-content {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  flex-wrap: wrap;
}

.profile-image {
  flex: 1;
  min-width: 300px;
  background: var(--grad-sun);
  aspect-ratio: 1;
  border-radius: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  color: white;
}

.profile-text {
  flex: 2;
  min-width: 300px;
}

/* CTA Section */
.cta {
  text-align: center;
  background: var(--dark);
  color: var(--white);
  padding: var(--space-xl) 0;
}

.cta h2 {
  font-size: 3rem;
  margin-bottom: var(--space-md);
  color: var(--white);
}

/* Footer */
footer {
  padding: var(--space-md) 0;
  text-align: center;
  background: var(--dark);
  color: var(--text-light);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

/* Animations */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero-content {
  animation: fadeInUp 1s ease-out;
}

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

.reveal.active {
  opacity: 1;
  transform: translateY(0);
}

/* Responsive */
@media (max-width: 768px) {
  :root {
    --space-lg: 3rem;
  }
  .section-title {
    font-size: 2rem;
  }
  .hero-title {
    font-size: 2.2rem;
  }
}