/* Canonical PenEcho public-site navigation. Page styles may define their own
   content layout, but every public page shares this header geometry and state. */

.site-nav {
  --site-nav-ink: #18181b;
  --site-nav-muted: #52525b;
  --site-nav-accent: #2563eb;
  --site-nav-line: #e4e4e7;
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  gap: 20px;
  min-height: 60px;
  padding: 0 max(20px, calc((100vw - 1120px) / 2));
  border-bottom: 1px solid var(--site-nav-line);
  background: rgb(255 255 255 / 88%);
  color: var(--site-nav-ink);
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  backdrop-filter: saturate(180%) blur(18px);
}

.site-nav.nav { padding-inline: 0; }
.site-nav > .nav-inner {
  display: flex;
  align-items: center;
  gap: 20px;
  width: min(1120px, calc(100% - 40px));
  min-height: 60px;
  margin-inline: auto;
}

.site-nav .site-nav-logo {
  display: inline-flex;
  flex: none;
  align-items: center;
  min-height: 44px;
  color: var(--site-nav-ink);
  text-decoration: none;
}
.site-nav .site-nav-logo img {
  display: block;
  width: auto;
  height: 26px;
  max-width: none;
  object-fit: contain;
}

.site-nav nav {
  display: flex;
  align-items: center;
  gap: 4px;
}
.site-nav nav a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 8px 12px;
  border-radius: 10px;
  color: var(--site-nav-muted);
  font-size: 13px;
  font-weight: 500;
  line-height: 1;
  text-decoration: none;
  white-space: nowrap;
  transition: background-color 120ms ease, color 120ms ease;
}
.site-nav nav a:hover {
  background: rgb(0 0 0 / 5%);
  color: var(--site-nav-ink);
  text-decoration: none;
}
.site-nav nav a[aria-current="page"],
.site-nav nav a.on {
  background: rgb(37 99 235 / 10%);
  color: var(--site-nav-accent);
  font-weight: 600;
}

.site-nav .nav-auth,
.site-nav .site-nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-left: auto;
}
.site-nav > .nav-login,
.site-nav .nav-signin,
.site-nav .head-account {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  margin-left: auto;
  padding: 8px 12px;
  border-radius: 10px;
  background: transparent;
  color: var(--site-nav-ink);
  font-size: 13px;
  font-weight: 500;
  line-height: 1;
  opacity: 1;
  text-decoration: none;
  white-space: nowrap;
}
.site-nav > .nav-login:hover,
.site-nav .nav-signin:hover,
.site-nav .head-account:hover {
  background: rgb(0 0 0 / 5%);
  color: var(--site-nav-ink);
  text-decoration: none;
}
.site-nav .nav-cta {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 8px 12px;
  border-radius: 10px;
  color: var(--site-nav-accent);
  font-size: 13px;
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
}
.site-nav .nav-cta:hover { background: rgb(37 99 235 / 8%); text-decoration: none; }

.site-nav .nav-account {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 44px;
  max-width: 240px;
  padding: 5px 12px 5px 5px;
  border: 1px solid var(--site-nav-line);
  border-radius: 10px;
  background: #fff;
  color: var(--site-nav-ink);
  text-decoration: none;
}
.site-nav .nav-account:hover { border-color: #a1a1aa; text-decoration: none; }
.site-nav .nav-account-avatar {
  display: inline-flex;
  flex: none;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--site-nav-accent);
  color: #fff;
  font-size: 12px;
  font-weight: 600;
}
.site-nav .nav-account-copy { display: flex; min-width: 0; flex-direction: column; line-height: 1.2; }
.site-nav .nav-account-copy strong { overflow: hidden; font-size: 13px; font-weight: 500; text-overflow: ellipsis; white-space: nowrap; }
.site-nav .nav-account-label { color: var(--site-nav-muted); font-size: 10px; }
.site-nav .nav-account-arrow { color: var(--site-nav-muted); font-size: 13px; }

.site-nav .head-spacer,
.site-nav .sponsors-nav-spacer { flex: 1; min-width: 0; }
.site-nav [hidden] { display: none !important; }
.site-nav .site-language-toggle { flex: none; }
.site-nav .site-language-toggle button { min-width: 32px; min-height: 30px; padding: 4px 6px; }

.site-nav :focus-visible {
  outline: 3px solid rgb(37 99 235 / 28%);
  outline-offset: 2px;
}

@media (max-width: 720px) {
  .site-nav { gap: 8px; min-height: 56px; padding: 6px 16px; }
  .site-nav.nav { padding-inline: 0; }
  .site-nav > .nav-inner { gap: 8px; width: calc(100% - 32px); min-height: 56px; }
  .site-nav nav { display: none; }
  .site-nav .site-nav-logo img { height: 24px; }
  .site-nav .nav-auth,
  .site-nav .site-nav-actions { gap: 4px; }
  .site-nav .nav-cta { display: none; }
  .site-nav .site-language-toggle { padding: 1px; }
  .site-nav .site-language-toggle button { min-width: 30px; min-height: 28px; padding-inline: 5px; }
  .site-nav .nav-account { max-width: min(210px, 52vw); }
}

@media (prefers-reduced-motion: reduce) {
  .site-nav nav a { transition: none; }
}