/* Reset & Base */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --color-primary: #14b8a6;
  --color-primary-dark: #0d9488;
  --color-bg: #f8fafc;
  --color-text: #1e293b;
  --color-text-muted: #64748b;
  --color-white: #ffffff;
  --color-border: #e2e8f0;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Hiragino Sans', 'Noto Sans JP', sans-serif;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  font-size: 16px;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.2s;
}

a:hover {
  color: var(--color-primary-dark);
}

/* Layout */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Header */
.header {
  background: var(--color-white);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 64px;
}

.logo {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-text);
}

.nav {
  display: flex;
  gap: 24px;
}

.nav a {
  color: var(--color-text-muted);
  font-size: 14px;
}

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

/* Hero */
.hero {
  padding: 80px 0 100px;
  text-align: center;
  background: linear-gradient(180deg, var(--color-white) 0%, var(--color-bg) 100%);
}

.hero h1 {
  font-size: 48px;
  font-weight: 700;
  margin-bottom: 24px;
  letter-spacing: -0.02em;
}

.hero h1 span {
  color: var(--color-primary);
}

.hero p {
  font-size: 18px;
  color: var(--color-text-muted);
  max-width: 600px;
  margin: 0 auto 40px;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: 12px;
  font-size: 16px;
  font-weight: 600;
  transition: all 0.2s;
  border: none;
  cursor: pointer;
}

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

.btn-primary:hover {
  background: #0f172a;
  color: var(--color-white);
  transform: translateY(-2px);
}

.btn-secondary {
  background: var(--color-white);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

/* Features */
.features {
  padding: 80px 0;
}

.features h2 {
  text-align: center;
  font-size: 32px;
  margin-bottom: 48px;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.feature-card {
  background: var(--color-white);
  border-radius: 16px;
  padding: 32px;
  border: 1px solid var(--color-border);
  transition: transform 0.2s, box-shadow 0.2s;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.08);
}

.feature-icon {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  font-size: 24px;
}

.feature-card h3 {
  font-size: 18px;
  margin-bottom: 12px;
}

.feature-card p {
  color: var(--color-text-muted);
  font-size: 14px;
}

/* How it works */
.how-it-works {
  padding: 80px 0;
  background: var(--color-white);
}

.how-it-works h2 {
  text-align: center;
  font-size: 32px;
  margin-bottom: 48px;
}

.steps {
  display: flex;
  flex-direction: column;
  gap: 32px;
  max-width: 600px;
  margin: 0 auto;
}

.step {
  display: flex;
  gap: 20px;
  align-items: flex-start;
}

.step-number {
  width: 40px;
  height: 40px;
  background: var(--color-primary);
  color: var(--color-white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  flex-shrink: 0;
}

.step-content h3 {
  font-size: 18px;
  margin-bottom: 8px;
}

.step-content p {
  color: var(--color-text-muted);
  font-size: 14px;
}

/* CTA Section */
.cta-section {
  padding: 80px 0;
  text-align: center;
}

.cta-box {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  border-radius: 24px;
  padding: 60px 40px;
  color: var(--color-white);
}

.cta-box h2 {
  font-size: 32px;
  margin-bottom: 16px;
}

.cta-box p {
  opacity: 0.9;
  margin-bottom: 32px;
}

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

.cta-box .btn-primary:hover {
  background: var(--color-bg);
}

/* Footer */
.footer {
  background: var(--color-white);
  border-top: 1px solid var(--color-border);
  padding: 40px 0;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  color: var(--color-text-muted);
  font-size: 14px;
}

.footer-copyright {
  color: var(--color-text-muted);
  font-size: 14px;
}

/* Legal Pages */
.legal-page {
  padding: 60px 0;
}

.legal-page h1 {
  font-size: 32px;
  margin-bottom: 8px;
}

.legal-page .last-updated {
  color: var(--color-text-muted);
  font-size: 14px;
  margin-bottom: 40px;
}

.legal-content {
  background: var(--color-white);
  border-radius: 16px;
  padding: 40px;
  border: 1px solid var(--color-border);
}

.legal-content h2 {
  font-size: 20px;
  margin-top: 32px;
  margin-bottom: 16px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
}

.legal-content h2:first-child {
  margin-top: 0;
  padding-top: 0;
  border-top: none;
}

.legal-content p {
  margin-bottom: 16px;
  color: var(--color-text-muted);
}

.legal-content ul {
  margin-bottom: 16px;
  padding-left: 24px;
  color: var(--color-text-muted);
}

.legal-content li {
  margin-bottom: 8px;
}

/* Responsive */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 32px;
  }

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

  .header-inner {
    flex-direction: column;
    height: auto;
    padding: 16px 0;
    gap: 12px;
  }

  .nav {
    gap: 16px;
  }

  .footer-inner {
    flex-direction: column;
    text-align: center;
  }

  .legal-content {
    padding: 24px;
  }
}