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

html {
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  font-family: "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, Roboto, "Helvetica Neue", Arial, sans-serif;
  background: linear-gradient(180deg, #ffffff 0%, #f5f7ff 100%);
  color: #1e293b;
  line-height: 1.65;
}

a {
  color: #4f46e5;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.topbar {
  border-bottom: 1px solid #e5e7eb;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 10;
}

.topbar-inner,
.wrap,
.footer-inner {
  width: min(760px, calc(100% - 2rem));
  margin: 0 auto;
}

.topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem 0;
}

.brand {
  font-weight: 700;
  color: #1e293b;
  letter-spacing: -0.02em;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  font-size: 0.9rem;
}

.wrap {
  padding: 2.25rem 0 3.5rem;
}

.eyebrow {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #4f46e5;
  margin-bottom: 0.75rem;
}

h1 {
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  line-height: 1.2;
  letter-spacing: -0.03em;
  margin-bottom: 0.5rem;
}

.meta {
  color: #64748b;
  font-size: 0.95rem;
  margin-bottom: 2rem;
}

h2 {
  font-size: 1.15rem;
  margin: 1.75rem 0 0.6rem;
  letter-spacing: -0.02em;
}

p,
ul {
  margin-bottom: 0.9rem;
  color: #334155;
}

ul {
  padding-left: 1.25rem;
}

li {
  margin-bottom: 0.35rem;
}

.note {
  margin-top: 2rem;
  padding: 1rem 1.1rem;
  border: 1px solid #e5e7eb;
  border-radius: 12px;
  background: #fff;
  color: #64748b;
  font-size: 0.95rem;
}

.footer {
  border-top: 1px solid #e5e7eb;
  padding: 1.25rem 0 2rem;
  color: #64748b;
  font-size: 0.9rem;
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  justify-content: space-between;
}