*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Segoe UI", sans-serif; color: #1d1d1f; background: #fff; line-height: 1.8; -webkit-font-smoothing: antialiased; }

/* Layout */
.container { max-width: 720px; margin: 0 auto; padding: 48px 24px 80px; }
.narrow { max-width: 640px; }

/* Nav */
.nav { border-bottom: 1px solid #e5e5e5; padding: 12px 24px; display: flex; align-items: center; justify-content: space-between; }
.nav-brand { font-size: 18px; font-weight: 600; color: #1d1d1f; text-decoration: none; }
.nav-links { display: flex; gap: 20px; font-size: 14px; }
.nav-links a { color: #424245; text-decoration: none; }
.nav-links a:hover { color: #0066cc; }

/* Typography */
h1 { font-size: 32px; line-height: 1.3; margin-bottom: 12px; }
h2 { font-size: 22px; margin: 36px 0 12px; }
h3 { font-size: 17px; margin: 28px 0 8px; }
p { margin-bottom: 16px; color: #424245; }
.subtitle { color: #86868b; font-size: 17px; margin-bottom: 32px; }

/* Links */
a { color: #0066cc; text-decoration: none; }
a:hover { text-decoration: underline; }

/* Hero (homepage) */
.hero { text-align: center; padding: 60px 0 40px; }
.hero h1 { font-size: 40px; margin-bottom: 16px; }
.hero .subtitle { font-size: 19px; }
.hero-cta { display: inline-block; background: #0066cc; color: #fff; padding: 14px 32px; border-radius: 24px; font-size: 16px; font-weight: 500; text-decoration: none; margin-top: 8px; }
.hero-cta:hover { background: #0055b3; text-decoration: none; }

/* Features */
.features { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; margin: 40px 0; }
.feature { background: #f5f5f7; border-radius: 16px; padding: 28px 24px; }
.feature h3 { margin: 0 0 8px; font-size: 16px; }
.feature p { font-size: 14px; margin: 0; color: #6e6e73; }

/* Steps */
ol.steps { counter-reset: step; list-style: none; padding: 0; margin: 20px 0 32px; }
ol.steps li { counter-increment: step; position: relative; padding-left: 40px; margin-bottom: 20px; }
ol.steps li::before { content: counter(step); position: absolute; left: 0; top: 0; width: 28px; height: 28px; background: #0066cc; color: #fff; border-radius: 50%; font-size: 14px; font-weight: 600; display: flex; align-items: center; justify-content: center; }

/* CTA box */
.cta-box { background: #f0f7ff; border-radius: 12px; padding: 28px; margin: 36px 0; text-align: center; }
.cta-box h3 { margin: 0 0 8px; }
.cta-box p { margin-bottom: 16px; font-size: 15px; }
.cta-btn { display: inline-block; background: #0066cc; color: #fff; padding: 12px 28px; border-radius: 20px; font-size: 15px; font-weight: 500; text-decoration: none; }
.cta-btn:hover { background: #0055b3; text-decoration: none; }

/* Guide list */
.guide-list { list-style: none; padding: 0; margin: 24px 0; }
.guide-list li { border-bottom: 1px solid #e5e5e5; }
.guide-list li:first-child { border-top: 1px solid #e5e5e5; }
.guide-list a { display: block; padding: 16px 0; color: #1d1d1f; font-size: 16px; text-decoration: none; }
.guide-list a::after { content: " →"; color: #86868b; }
.guide-list a:hover { color: #0066cc; }

/* Tip box */
.tip { background: #fffbe6; border-left: 3px solid #f5c518; padding: 16px 20px; border-radius: 0 8px 8px 0; margin: 20px 0; font-size: 15px; }

/* Footer */
.footer { border-top: 1px solid #e5e5e5; padding: 24px; text-align: center; font-size: 13px; color: #86868b; }
.footer a { color: #86868b; margin: 0 8px; }

/* Responsive */
@media (max-width: 600px) {
  .hero h1 { font-size: 28px; }
  h1 { font-size: 26px; }
  .features { grid-template-columns: 1fr; }
  .nav { padding: 12px 16px; }
  .container { padding: 32px 16px 60px; }
}