:root {
  --primary: #2196f3;
  --primary-dark: #1976d2;
  --primary-light: #64b5f6;
  --secondary: #f44336;
  --secondary-dark: #d32f2f;
  --secondary-light: #e57373;
  --background: #ffffff;
  --surface: #f5f5f5;
  --text: #212121;
  --text-secondary: #757575;
  --border: #e0e0e0;
  --success: #4caf50;
  --error: #f44336;
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.12);
  --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.15);
  --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.2);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family:
    -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue',
    Arial, 'Noto Sans JP', sans-serif;
  color: var(--text);
  background: var(--background);
  line-height: 1.6;
  overflow-x: hidden;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Navigation */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm);
  z-index: 1000;
}

.nav-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 16px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text);
}

.nav-logo img {
  width: 40px;
  height: 40px;
  border-radius: 10px;
}

.nav-logo-text {
  font-size: 20px;
  font-weight: 700;
}

.nav-links {
  display: flex;
  gap: 24px;
  align-items: center;
}

.nav-link {
  text-decoration: none;
  color: var(--text-secondary);
  font-weight: 500;
  transition: color 0.2s ease;
}

.nav-link:hover {
  color: var(--primary);
}

.lang-switch {
  display: flex;
  gap: 8px;
}

.lang-btn {
  padding: 8px 16px;
  border: 1px solid var(--border);
  background: white;
  border-radius: 20px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  transition: all 0.2s ease;
}

.lang-btn.active {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}

.lang-btn:hover:not(.active) {
  background: var(--surface);
}

/* Hero Section */
.hero {
  padding: 120px 20px 80px;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  text-align: center;
}

.hero-content {
  max-width: 800px;
  margin: 0 auto;
}

.hero-icon {
  width: 120px;
  height: 120px;
  margin: 0 auto 24px;
  border-radius: 28px;
  box-shadow: var(--shadow-lg);
}

.hero h1 {
  font-size: 48px;
  font-weight: 800;
  margin-bottom: 16px;
  line-height: 1.2;
}

.hero p {
  font-size: 20px;
  margin-bottom: 40px;
  opacity: 0.95;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 16px 32px;
  font-size: 16px;
  font-weight: 600;
  border: none;
  border-radius: 50px;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.3s ease;
  box-shadow: var(--shadow-md);
}

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

.btn-secondary {
  background: rgba(255, 255, 255, 0.2);
  color: white;
  border: 2px solid rgba(255, 255, 255, 0.4);
  backdrop-filter: blur(10px);
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn:active {
  transform: translateY(0);
}

/* Section Styles */
.section {
  padding: 80px 20px;
}

.section-title {
  text-align: center;
  margin-bottom: 48px;
}

.section-title h2 {
  font-size: 36px;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text);
}

.section-title p {
  font-size: 18px;
  color: var(--text-secondary);
}

/* Features Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  max-width: 1200px;
  margin: 0 auto;
}

.feature-card {
  background: var(--surface);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: all 0.3s ease;
  border: 1px solid var(--border);
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary);
}

.feature-icon {
  width: 56px;
  height: 56px;
  background: var(--primary);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  color: white;
  font-size: 28px;
}

.feature-card h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text);
}

.feature-card p {
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Personas Section */
.personas {
  background: var(--surface);
}

.personas-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 32px;
  max-width: 1200px;
  margin: 0 auto;
}

.persona-card {
  background: white;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: all 0.3s ease;
}

.persona-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

.persona-header {
  padding: 32px;
  text-align: center;
  color: white;
}

.persona-hiroyuki .persona-header {
  background: linear-gradient(135deg, #ff9800 0%, #f57c00 100%);
}

.persona-socrates .persona-header {
  background: linear-gradient(135deg, #4caf50 0%, #388e3c 100%);
}

.persona-critical .persona-header {
  background: linear-gradient(135deg, #2196f3 0%, #1976d2 100%);
}

.persona-icon {
  font-size: 48px;
  margin-bottom: 16px;
}

.persona-name {
  font-size: 24px;
  font-weight: 700;
}

.persona-body {
  padding: 24px;
}

.persona-description {
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 16px;
}

.persona-traits {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.trait-badge {
  background: var(--surface);
  color: var(--text);
  padding: 6px 12px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
}

/* How it Works */
.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 32px;
  max-width: 1000px;
  margin: 0 auto;
}

.step {
  text-align: center;
  position: relative;
}

.step-number {
  width: 60px;
  height: 60px;
  background: var(--primary);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  font-weight: 700;
  margin: 0 auto 20px;
  box-shadow: var(--shadow-md);
}

.step h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text);
}

.step p {
  color: var(--text-secondary);
  line-height: 1.6;
}

/* FAQ Section */
.faq {
  background: var(--surface);
}

.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  background: white;
  border-radius: var(--radius-md);
  margin-bottom: 16px;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.faq-question {
  padding: 20px 24px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background 0.2s ease;
}

.faq-question:hover {
  background: var(--surface);
}

.faq-answer {
  padding: 0 24px 20px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Footer */
.footer {
  background: var(--text);
  color: white;
  padding: 48px 20px;
  text-align: center;
}

.footer-content {
  max-width: 800px;
  margin: 0 auto;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 32px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.footer-link {
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
  transition: color 0.2s ease;
}

.footer-link:hover {
  color: white;
}

.footer-copyright {
  color: rgba(255, 255, 255, 0.6);
  font-size: 14px;
}

/* Support Page */
.support {
  padding: 120px 20px 80px;
  max-width: 800px;
  margin: 0 auto;
}

.support h1 {
  font-size: 36px;
  font-weight: 700;
  margin-bottom: 16px;
  text-align: center;
}

.support-subtitle {
  text-align: center;
  color: var(--text-secondary);
  margin-bottom: 48px;
  font-size: 18px;
}

.contact-card {
  background: var(--surface);
  border-radius: var(--radius-lg);
  padding: 40px;
  text-align: center;
  margin-bottom: 40px;
}

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

.contact-title {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 12px;
}

.contact-description {
  color: var(--text-secondary);
  margin-bottom: 24px;
}

.contact-email {
  font-size: 18px;
  color: var(--primary);
  font-weight: 600;
  word-break: break-all;
}

/* Utility */
.text-center {
  text-align: center;
}

.mt-lg {
  margin-top: 40px;
}

.mb-lg {
  margin-bottom: 40px;
}

.hidden {
  display: none;
}