/* Reset & Base */
* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif; color: #3a3226; background: #f0f6fb; }
a { color: #4a8ac4; }

/* Nav */
nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 32px;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(180,170,150,0.15);
}
nav .logo {
  color: #4a6fa5;
  font-size: 1.1rem;
  font-weight: 700;
  text-decoration: none;
}
nav .nav-links {
  display: flex;
  gap: 28px;
  align-items: center;
}
nav .nav-links a {
  color: #7a8a9a;
  text-decoration: none;
  font-size: 0.85rem;
  transition: color 0.2s;
}
nav .nav-links a:hover { color: #4a6fa5; }
nav .nav-cta {
  padding: 8px 20px;
  background: linear-gradient(135deg, #5b9bd5, #4a8ac4);
  border: none;
  border-radius: 8px;
  color: #fff !important;
  font-weight: 600;
}
nav .nav-cta:hover { opacity: 0.9; }
nav a.back {
  color: #7a8a9a;
  text-decoration: none;
  font-size: 0.85rem;
}
nav a.back:hover { color: #4a6fa5; }

/* Footer */
.footer-links {
  text-align: center;
  padding: 40px 20px;
  border-top: 1px solid rgba(90,140,190,0.1);
  background: #e4eff8;
}
.footer-links a {
  color: #7a8a9a;
  text-decoration: none;
  font-size: 0.8rem;
  margin: 0 16px;
  transition: color 0.2s;
}
.footer-links a:hover { color: #4a6fa5; }
footer {
  text-align: center;
  padding: 0 20px 32px;
  font-size: 0.75rem;
  color: #a0b0c0;
  background: #e4eff8;
}

/* Sub-page common */
.sub-container {
  max-width: 680px;
  margin: 0 auto;
  padding: 90px 20px 40px;
}
.sub-card {
  background: #fff;
  border-radius: 16px;
  padding: 40px 36px;
  border: 1px solid rgba(90,140,190,0.12);
  box-shadow: 0 2px 12px rgba(90,140,190,0.08);
}
.sub-card h1 { font-size: 1.5rem; margin-bottom: 8px; color: #2c3e50; }
.sub-card .date { font-size: 0.85rem; color: #7a8a9a; margin-bottom: 32px; }
.sub-card h2 { font-size: 1.1rem; margin: 28px 0 8px; color: #2c3e50; }
.sub-card p, .sub-card li { font-size: 0.95rem; margin-bottom: 8px; color: #4a5a6a; line-height: 1.8; }
.sub-card ul { padding-left: 1.5em; }
.sub-card table { width: 100%; border-collapse: collapse; margin: 20px 0; }
.sub-card th, .sub-card td { padding: 12px; border-bottom: 1px solid rgba(90,140,190,0.08); font-size: 0.95rem; text-align: left; vertical-align: top; color: #4a5a6a; }
.sub-card th { width: 35%; color: #2c3e50; font-weight: 600; }

/* Responsive */
@media (max-width: 700px) {
  nav { padding: 12px 16px; }
  nav .nav-links { gap: 16px; }
  .sub-card { padding: 28px 20px; }
  .sub-card th { width: 30%; }
}