* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
}

.codex-nav {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 16px 32px;
  border-bottom: 1px solid var(--color-border);
  background: rgba(250, 250, 247, 0.92);
  backdrop-filter: blur(12px);
}

.codex-nav__logo {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  color: var(--color-text);
  font-size: 15px;
  font-weight: 800;
  text-decoration: none;
}

.codex-nav__links {
  display: flex;
  align-items: center;
  gap: 18px;
}

.codex-nav__link {
  color: var(--color-text-muted);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
}

.codex-nav__link:hover,
.codex-nav__link:focus-visible {
  color: var(--color-brand-text);
}

.codex-nav__app {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 9px 18px;
  border-radius: var(--radius-pill);
  background: var(--color-forest);
  color: var(--color-text-inverse);
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
}

.codex-main {
  position: relative;
  padding: clamp(30px, 6vw, 76px) 20px 100px;
}

.codex-main::before {
  position: absolute;
  inset: 0 0 auto;
  z-index: -1;
  height: 520px;
  background-image: radial-gradient(circle, rgba(0, 200, 83, 0.08) 1px, transparent 1px);
  background-size: 32px 32px;
  content: "";
  mask-image: linear-gradient(to bottom, var(--color-text), transparent);
}

.codex-guide {
  max-width: 900px;
  margin: 0 auto;
}

.codex-guide > .guide-panel {
  padding: 0;
  border: 0;
  background: transparent;
}

.codex-noscript {
  max-width: 720px;
  margin: 60px auto;
  padding: 28px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  background: var(--color-bg-card);
}

@media (max-width: 760px) {
  .codex-nav {
    padding: 14px 18px;
  }

  .codex-nav__links .codex-nav__link {
    display: none;
  }

  .codex-main {
    padding-inline: 12px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}