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

:root {
  --color-bg: #ffffff;
  --color-text: #111111;
  --color-text-secondary: #555555;
  --color-border: #e5e5e5;
  --color-accent: #2563eb;
  --color-accent-hover: #1d4ed8;
  --color-accent-light: #eff4ff;
  --font-stack: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --max-width: 760px;
}

body {
  font-family: var(--font-stack);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

/* ---- Header ---- */
header {
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  max-width: 960px;
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--color-text);
}

.logo svg {
  width: 48px;
  height: 20px;
}

.logo-text {
  font-size: 16px;
  font-weight: 600;
  letter-spacing: -0.02em;
}

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

nav a {
  text-decoration: none;
  color: var(--color-text-secondary);
  font-size: 14px;
  font-weight: 500;
}

nav a:hover,
nav a[aria-current="page"] {
  color: var(--color-accent);
}

/* ---- Document ---- */
main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 64px 24px 96px;
}

.section-label {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-accent);
  margin-bottom: 12px;
}

h1 {
  font-size: clamp(32px, 5vw, 44px);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 12px;
}

.effective {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: 40px;
}

h2 {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 40px 0 12px;
}

p, li {
  font-size: 16px;
  color: var(--color-text-secondary);
}

p + p {
  margin-top: 12px;
}

ul, ol {
  padding-left: 22px;
  margin-top: 12px;
}

li + li {
  margin-top: 6px;
}

strong {
  color: var(--color-text);
}

a {
  color: var(--color-accent);
}

a:hover {
  color: var(--color-accent-hover);
}

.callout {
  background: var(--color-accent-light);
  border: 1px solid #dbe4f0;
  border-radius: 8px;
  padding: 20px 24px;
  margin-top: 16px;
}

/* ---- Footer ---- */
footer {
  border-top: 1px solid var(--color-border);
}

.footer-inner {
  max-width: 960px;
  margin: 0 auto;
  padding: 32px 24px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
  justify-content: space-between;
}

footer p,
footer a {
  font-size: 13px;
  color: var(--color-text-secondary);
}

footer .links {
  display: flex;
  gap: 20px;
}

@media (max-width: 600px) {
  main {
    padding-top: 40px;
  }

  .logo-text {
    display: none;
  }
}