/**
 * m43 site shell — header, footer, main content (UI “chrome” in the old sense, not a browser name).
 * Requires m43-tokens.css first.
 */
.m43-site-header {
  max-width: var(--m43-content-max);
  margin: 0 auto;
  padding: 2.5rem 1.25rem 1rem;
  border-bottom: 1px solid var(--m43-border);
}

.m43-site-header h1 {
  margin: 0 0 0.75rem;
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  letter-spacing: -0.02em;
  color: var(--m43-text);
}

.m43-intro {
  margin: 0 0 1rem;
  color: var(--m43-muted);
  max-width: 48rem;
}

.m43-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
}

.m43-nav a {
  color: var(--m43-accent);
  text-decoration-thickness: 0.08em;
}

.m43-main,
main.m43-main {
  max-width: var(--m43-content-max);
  margin: 0 auto;
  padding: 2rem 1.25rem 3rem;
}

.m43-section-title {
  margin: 0 0 1.25rem;
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--m43-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.m43-site-footer {
  max-width: var(--m43-content-max);
  margin: 0 auto;
  padding: 2rem 1.25rem 3rem;
  border-top: 1px solid var(--m43-border);
  font-size: 0.875rem;
  color: var(--m43-muted);
}

.m43-site-footer p {
  margin: 0;
}

.m43-page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.m43-page__body {
  flex: 1;
}

/* Optional top row: title + shared-api-platform auth (see m43-auth-header.js) */
.m43-site-header__row {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem 1.5rem;
  margin: 0 0 0.5rem;
}

.m43-site-header__row > h1 {
  margin: 0 0 0.75rem;
  flex: 1;
  min-width: min(100%, 12rem);
}

.m43-site-header__auth {
  flex-shrink: 0;
  margin-left: auto;
}

.m43-auth-header {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  min-height: 2.5rem;
}

.m43-auth-header .m43-button:focus-visible,
.m43-auth-user__trigger:focus-visible,
.m43-auth-user__item:focus-visible {
  outline: 2px solid var(--m43-ring);
  outline-offset: var(--m43-ring-offset);
}

.m43-auth-user {
  position: relative;
}

.m43-auth-user__trigger {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  max-width: 14rem;
  font: inherit;
  line-height: 1.2;
  padding: 0.4rem 0.6rem;
  border-radius: var(--m43-radius-md);
  border: 1px solid var(--m43-border);
  background: var(--m43-surface);
  color: var(--m43-text);
  cursor: pointer;
  text-align: left;
}

.m43-auth-user__icon {
  flex-shrink: 0;
  display: block;
  opacity: 0.9;
}

.m43-auth-user__label {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 0.9rem;
  color: var(--m43-muted);
}

.m43-auth-user__menu {
  position: absolute;
  right: 0;
  top: calc(100% + 0.3rem);
  z-index: 20;
  min-width: 10rem;
  margin: 0;
  padding: 0.35rem 0;
  list-style: none;
  background: var(--m43-elevated);
  border: 1px solid var(--m43-border);
  border-radius: var(--m43-radius-sm);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.18);
}

.m43-auth-user__menu[hidden] {
  display: none;
}

.m43-auth-user__item {
  display: block;
  width: 100%;
  margin: 0;
  font: inherit;
  text-align: left;
  padding: 0.45rem 0.75rem;
  border: none;
  background: transparent;
  color: var(--m43-text);
  cursor: pointer;
}

.m43-auth-user__item:hover,
.m43-auth-user__item:focus-visible {
  background: var(--m43-surface);
}