/* ------------------------------------------------------------------
   Header, navigation, footer
   ------------------------------------------------------------------ */

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 100;
  height: var(--header-h);
  transition: background-color 0.4s var(--ease-out), box-shadow 0.4s var(--ease-out), backdrop-filter 0.4s;
}

.site-header.is-scrolled,
.site-header.is-open {
  background: color-mix(in srgb, var(--paper) 78%, transparent);
  backdrop-filter: saturate(1.4) blur(16px);
  -webkit-backdrop-filter: saturate(1.4) blur(16px);
  box-shadow: 0 1px 0 var(--rule);
}

.site-header__inner {
  width: min(100% - 2 * var(--gutter), var(--max));
  height: 100%;
  margin-inline: auto;
  display: flex;
  align-items: center;
  gap: 2rem;
}

.wordmark {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  color: var(--ink);
}

.wordmark .brand-mark { color: var(--moss); transition: transform 0.6s var(--ease-out); }
.wordmark:hover .brand-mark { transform: rotate(-8deg); }

.brand-mark .wave { transition: opacity 0.3s; }
.wordmark:hover .wave--1 { animation: wave 1.2s var(--ease-out) infinite; }
.wordmark:hover .wave--2 { animation: wave 1.2s 0.15s var(--ease-out) infinite; }
.wordmark:hover .wave--3 { animation: wave 1.2s 0.3s var(--ease-out) infinite; }

@keyframes wave { 0%, 100% { opacity: 1; } 50% { opacity: 0.2; } }

.wordmark__text {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 420;
  letter-spacing: -0.035em;
  font-variation-settings: "SOFT" 100, "WONK" 1;
  line-height: 1;
  padding-bottom: 0.1em;
}

.nav {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  margin-left: auto;
}

.nav__link {
  position: relative;
  padding: 0.5rem 0.85rem;
  border-radius: 999px;
  font-size: 0.95rem;
  font-weight: 450;
  text-decoration: none;
  color: var(--ink-2);
  transition: color 0.25s, background-color 0.25s;
}

.nav__link:hover { color: var(--ink); background: color-mix(in srgb, var(--ink) 6%, transparent); }

.nav__link.is-active { color: var(--ink); }
.nav__link.is-active::after {
  content: "";
  position: absolute;
  left: 50%; bottom: 0.15rem;
  width: 5px; height: 5px;
  border-radius: 50%;
  background: var(--signal);
  transform: translateX(-50%);
}

.nav__link--admin { font-family: var(--font-mono); font-size: var(--step--1); color: var(--moss); }

.site-header__tools { display: flex; align-items: center; gap: 0.25rem; }

.icon-button {
  display: inline-grid;
  place-items: center;
  width: 40px; height: 40px;
  padding: 0;
  border: 0;
  border-radius: 50%;
  background: transparent;
  cursor: pointer;
  color: var(--ink);
  transition: background-color 0.25s, transform 0.5s var(--ease-out);
}
.icon-button:hover { background: color-mix(in srgb, var(--ink) 7%, transparent); }
.icon-button svg { width: 20px; height: 20px; }
.theme-toggle:hover svg { transform: rotate(180deg); transition: transform 0.6s var(--ease-out); }

.nav-toggle { display: none; }
.nav-toggle span {
  display: block;
  grid-area: 1 / 1;
  width: 18px; height: 1.5px;
  background: currentColor;
  border-radius: 2px;
  transition: transform 0.4s var(--ease-out);
}
.nav-toggle span:first-child { transform: translateY(-4px); }
.nav-toggle span:last-child { transform: translateY(4px); }
.is-open .nav-toggle span:first-child { transform: rotate(45deg); }
.is-open .nav-toggle span:last-child { transform: rotate(-45deg); }

@media (max-width: 760px) {
  .nav-toggle { display: inline-grid; }
  .site-header__tools { margin-left: auto; }

  .nav {
    position: fixed;
    inset: var(--header-h) 0 0;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 0;
    margin: 0;
    padding: 2rem var(--gutter);
    background: var(--paper);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-12px);
    transition: opacity 0.35s var(--ease-out), transform 0.5s var(--ease-out), visibility 0.35s;
  }

  .is-open .nav { opacity: 1; visibility: visible; transform: none; }

  .nav__link {
    padding: 1rem 0;
    border-radius: 0;
    border-bottom: 1px solid var(--rule);
    font-family: var(--font-display);
    font-size: var(--step-3);
    font-weight: 340;
    letter-spacing: -0.03em;
    color: var(--ink);
  }
  .nav__link:hover { background: none; }
  .nav__link.is-active { font-style: italic; color: var(--moss); }
  .nav__link.is-active::after { left: auto; right: 0; bottom: 50%; width: 9px; height: 9px; }
  .nav__link--admin { font-size: var(--step-1); }
}

/* Footer ------------------------------------------------------------ */

.site-footer {
  margin-top: clamp(4rem, 10vw, 9rem);
  border-top: 1px solid var(--rule);
  overflow: hidden;
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 2.5rem;
  padding-block: clamp(3rem, 6vw, 5rem) 2rem;
}

.site-footer__lede {
  max-width: 30rem;
  margin-top: 1rem;
  font-family: var(--font-display);
  font-size: var(--step-1);
  font-weight: 340;
  line-height: 1.4;
  color: var(--ink-2);
}

.site-footer__col { display: flex; flex-direction: column; gap: 0.55rem; }
.site-footer__col .eyebrow { margin-bottom: 0.6rem; }
.site-footer__col a {
  width: fit-content;
  text-decoration: none;
  color: var(--ink-2);
  background: linear-gradient(currentColor, currentColor) left bottom / 0 1px no-repeat;
  transition: background-size 0.4s var(--ease-out), color 0.2s;
}
.site-footer__col a:hover { color: var(--ink); background-size: 100% 1px; }

.site-footer__mark {
  display: flex;
  justify-content: center;
  margin-top: clamp(1rem, 3vw, 3rem);
  margin-bottom: -0.2em;
  font-family: var(--font-display);
  font-size: clamp(5rem, 27vw, 28rem);
  font-style: italic;
  font-weight: 300;
  line-height: 0.82;
  letter-spacing: -0.06em;
  font-variation-settings: "SOFT" 100, "WONK" 1;
  color: var(--moss);
  user-select: none;
  white-space: nowrap;
}

.site-footer__mark span {
  background: linear-gradient(180deg, var(--moss) 30%, color-mix(in srgb, var(--moss) 15%, var(--paper)) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  padding-inline: 0.06em;
}

.site-footer__base {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem 2rem;
  padding-block: 1.25rem 0;
  border-top: 1px solid var(--rule);
  color: var(--muted);
}
.site-footer__base a { text-decoration: none; }
.site-footer__base form { display: inline; }

@media (max-width: 760px) {
  .site-footer__grid { grid-template-columns: 1fr 1fr; }
  .site-footer__intro { grid-column: 1 / -1; }
}