/* ===== RESET & BASE ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  background-color: #ffffff;
  color: #1a1a1a;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ===== LAYOUT ===== */
.container {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== HEADER ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: #ffffff;
  border-bottom: 1px solid #e8e8e8;
}

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

.logo-link {
  display: flex;
  align-items: center;
  text-decoration: none;
}

.logo-img {
  height: 36px;
  width: auto;
  display: block;
}

/* ===== NAV ===== */
.site-nav ul {
  display: flex;
  list-style: none;
  gap: 32px;
}

.site-nav a {
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  color: #4a4a4a;
  letter-spacing: 0.01em;
  transition: color 0.15s ease;
}

.site-nav a:hover {
  color: #0066ff;
}

/* ===== HERO ===== */
.hero-section {
  min-height: calc(100vh - 64px);
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: #ffffff;
}

.hero-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 24px;
  padding: 80px 24px;
}

.hero-headline {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 700;
  color: #111111;
  letter-spacing: -0.03em;
  line-height: 1.1;
}

.hero-tagline {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: #6b6b6b;
  font-weight: 400;
  max-width: 480px;
  line-height: 1.6;
}

/* ===== CTA BUTTON ===== */
.btn-primary {
  display: inline-block;
  margin-top: 8px;
  padding: 14px 36px;
  background-color: #0066ff;
  color: #ffffff;
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  border-radius: 6px;
  border: 2px solid #0066ff;
  transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.btn-primary:hover {
  background-color: transparent;
  color: #0066ff;
}

/* ===== FOOTER ===== */
.site-footer {
  border-top: 1px solid #e8e8e8;
  background-color: #fafafa;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: 16px;
}

.footer-copy {
  font-size: 0.85rem;
  color: #9a9a9a;
}

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

.footer-nav a {
  text-decoration: none;
  font-size: 0.85rem;
  color: #9a9a9a;
  transition: color 0.15s ease;
}

.footer-nav a:hover {
  color: #0066ff;
}

/* ===== MOBILE ===== */
@media (max-width: 600px) {
  .header-inner {
    flex-direction: column;
    height: auto;
    padding: 16px 0;
    gap: 12px;
  }

  .site-nav ul {
    gap: 20px;
  }

  .hero-section {
    min-height: auto;
  }

  .hero-inner {
    padding: 60px 16px;
  }

  .footer-inner {
    flex-direction: column;
    height: auto;
    padding: 20px 0;
    text-align: center;
  }

  .footer-nav {
    gap: 16px;
  }
}