/* ============================================================================
   ICResG — Site navigation (Savanna)

   The bar rides transparent over the espresso hero band, then detaches on
   scroll into a floating CREAM pill — the ground inverts, so the header
   announces that you have left the masthead and entered the page.

   Every colour flips through two variables rather than duplicated rules:
     --nav-fg / --nav-fg-strong / --nav-line / --nav-hover
   are redefined once on .is-stuck and every child follows.

   Structure:
     .site-header
       .nav-strip     thin utility bar (desktop; collapses once scrolled)
       .nav-shell     the bar that morphs into the pill
       .nav-progress  scroll-position hairline
     .nav-drawer      full-screen mobile overlay
   ========================================================================== */

/* --------------------------------------------------------------- header --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1040;
  padding: 0;
  background: none;
  border: 0;
  transition: padding var(--dur-slow) var(--ease-out);

  /* Riding the dark masthead. */
  --nav-fg:        rgba(255, 250, 242, .80);
  --nav-fg-strong: #FFFCF6;
  --nav-line:      rgba(255, 250, 242, .18);
  --nav-hover:     rgba(255, 250, 242, .10);
}
.site-header::before {
  /* The espresso plate behind the header at rest. Fades as the bar detaches,
     so the pill appears to lift off the page. */
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: calc(var(--nav-strip-h) + var(--nav-h));
  background: linear-gradient(180deg, var(--deep-3) 0%, var(--deep) 100%);
  border-bottom: 1px solid rgba(201, 168, 120, .16);
  opacity: 1;
  transition: opacity var(--dur-slow) var(--ease-out);
}
.site-header.is-stuck { padding: 10px clamp(.5rem, 2vw, 1.5rem) 0; }
.site-header.is-stuck::before { opacity: 0; }

/* Detached: the ground inverts to cream and the ink follows. */
.site-header.is-stuck {
  --nav-fg:        var(--ink-soft);
  --nav-fg-strong: var(--ink);
  --nav-line:      var(--hairline);
  --nav-hover:     var(--paper-alt);
}

/* ---------------------------------------------------------- utility strip -- */
.nav-strip {
  position: relative;
  height: var(--nav-strip-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-4);
  font-size: var(--fs-xs);
  color: rgba(255, 250, 242, .58);
  letter-spacing: .04em;
  overflow: hidden;
  transition: height var(--dur-slow) var(--ease-out),
              opacity var(--dur) var(--ease-out);
}
.site-header.is-stuck .nav-strip { height: 0; opacity: 0; }
.nav-strip a { color: rgba(255, 250, 242, .7); text-decoration: none; transition: color var(--dur-fast); }
.nav-strip a:hover { color: var(--gold); text-decoration: none; }
.nav-strip__group { display: flex; align-items: center; gap: var(--sp-4); min-width: 0; }
.nav-strip__item { display: inline-flex; align-items: center; gap: .45em; white-space: nowrap; }
.nav-strip__socials { display: inline-flex; gap: var(--sp-3); }
.nav-strip__socials .ico { --ico-size: .95rem; }
@media (max-width: 991.98px) {
  .nav-strip { display: none; }
  /* The plate must not reserve space for a strip that isn't rendered, or the
     bar sits in a band of dead espresso. */
  :root { --nav-strip-h: 0px; }
}

/* ------------------------------------------------------------- nav shell --- */
.nav-shell {
  position: relative;
  display: flex;
  align-items: center;
  gap: var(--sp-4);
  height: var(--nav-h);
  padding: 0 var(--sp-2);
  border-radius: 0;
  background: transparent;
  border: 1px solid transparent;
  transition: height var(--dur-slow) var(--ease-out),
              padding var(--dur-slow) var(--ease-out),
              background var(--dur-slow) var(--ease-out),
              border-color var(--dur-slow) var(--ease-out),
              box-shadow var(--dur-slow) var(--ease-out),
              border-radius var(--dur-slow) var(--ease-spring);
}
.site-header.is-stuck .nav-shell {
  height: var(--nav-h-stuck);
  padding: 0 var(--sp-4);
  border-radius: var(--radius-pill);
  background: var(--raise);
  border-color: var(--hairline);
  box-shadow: 0 14px 44px rgba(34, 25, 19, .16), 0 2px 6px rgba(34, 25, 19, .08);
}

/* ----------------------------------------------------------------- brand --- */
.nav-brand {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  text-decoration: none;
  margin-right: auto;
  min-width: 0;
}
.nav-brand:hover { text-decoration: none; }
.nav-brand__mark {
  width: 42px; height: 42px; flex: none;
  transition: width var(--dur-slow) var(--ease-out),
              height var(--dur-slow) var(--ease-out),
              transform var(--dur-slow) var(--ease-spring);
}
.nav-brand:hover .nav-brand__mark { transform: rotate(-8deg) scale(1.06); }
.site-header.is-stuck .nav-brand__mark { width: 34px; height: 34px; }
.nav-brand__text { display: flex; flex-direction: column; min-width: 0; line-height: 1.15; }
.nav-brand__name {
  font-family: var(--head);
  font-weight: 700;
  color: var(--nav-fg-strong);
  font-size: var(--fs-sm);
  letter-spacing: -.01em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: color var(--dur-slow) var(--ease-out);
}
.nav-brand__motto {
  font-family: var(--body);
  font-size: .62rem;
  font-weight: 700;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--gold);
  white-space: nowrap;
  transition: opacity var(--dur) var(--ease-out), max-height var(--dur-slow) var(--ease-out);
  max-height: 2em;
}
.site-header.is-stuck .nav-brand__motto { opacity: 0; max-height: 0; }
@media (max-width: 480px) { .nav-brand__text { display: none; } }

/* ----------------------------------------------------------------- links --- */
.nav-links {
  position: relative;
  display: flex;
  align-items: center;
  gap: 2px;
  list-style: none;
  margin: 0;
  padding: 0;
}
@media (max-width: 1199.98px) { .nav-links { display: none; } }

.nav-link-item { position: relative; }
.nav-link-btn {
  position: relative;
  z-index: 1;
  display: inline-flex;
  align-items: center;
  gap: .4em;
  padding: .62em .95em;
  border: 0;
  background: none;
  border-radius: var(--radius-pill);
  font-family: var(--body);
  font-size: var(--fs-sm);
  font-weight: 600;
  letter-spacing: .01em;
  color: var(--nav-fg);
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
  transition: color var(--dur) var(--ease-out);
}
.nav-link-btn:hover,
.nav-link-btn:focus-visible,
.nav-link-btn[aria-expanded="true"],
.nav-link-btn.is-active { color: var(--nav-fg-strong); text-decoration: none; }
.nav-link-btn__caret {
  --ico-size: .85em;
  opacity: .55;
  transition: transform var(--dur) var(--ease-spring), opacity var(--dur);
}
.nav-link-btn[aria-expanded="true"] .nav-link-btn__caret { transform: rotate(180deg); opacity: 1; }

/* The sliding indicator. JS sets --x and --w; the spring easing does the rest. */
.nav-indicator {
  position: absolute;
  top: 50%;
  left: 0;
  height: 2.45em;
  width: var(--w, 0);
  transform: translate(var(--x, 0), -50%);
  border-radius: var(--radius-pill);
  background: var(--nav-hover);
  border: 1px solid var(--nav-line);
  pointer-events: none;
  opacity: 0;
  transition: transform var(--dur-slow) var(--ease-spring),
              width var(--dur-slow) var(--ease-spring),
              opacity var(--dur) var(--ease-out),
              background var(--dur) var(--ease-out),
              border-color var(--dur) var(--ease-out);
}
.nav-links.has-indicator .nav-indicator { opacity: 1; }
.nav-links[data-hovering="true"] .nav-indicator {
  background: var(--accent-soft);
  border-color: rgba(30, 122, 107, .38);
}
.site-header:not(.is-stuck) .nav-links[data-hovering="true"] .nav-indicator {
  background: rgba(46, 156, 136, .22);
  border-color: rgba(46, 156, 136, .42);
}
/* Gold pip marks the active page even while the indicator is elsewhere. */
.nav-link-btn.is-active::after {
  content: "";
  position: absolute;
  left: 50%; bottom: .3em;
  width: 5px; height: 5px;
  margin-left: -2.5px;
  border-radius: 50%;
  background: var(--gold);
}

/* ------------------------------------------------------------ mega menu --- */
.nav-panel {
  position: absolute;
  top: calc(100% + 14px);
  left: 50%;
  z-index: 40;
  min-width: 310px;
  padding: var(--sp-3);
  border-radius: var(--radius-lg);
  background: var(--raise);
  border: 1px solid var(--hairline);
  box-shadow: 0 24px 60px rgba(34, 25, 19, .2), 0 4px 12px rgba(34, 25, 19, .1);
  opacity: 0;
  visibility: hidden;
  transform: translate(-50%, -8px) scale(.97);
  transform-origin: top center;
  transition: opacity var(--dur) var(--ease-out),
              transform var(--dur) var(--ease-spring),
              visibility 0s linear var(--dur);
}
.nav-link-item.is-open .nav-panel {
  opacity: 1;
  visibility: visible;
  transform: translate(-50%, 0) scale(1);
  transition-delay: 0s;
}
/* Notch tying the panel to its trigger. */
.nav-panel::before {
  content: "";
  position: absolute;
  top: -6px; left: 50%;
  width: 12px; height: 12px;
  margin-left: -6px;
  transform: rotate(45deg);
  background: var(--raise);
  border-left: 1px solid var(--hairline);
  border-top: 1px solid var(--hairline);
}
/* Hit-area bridge so the pointer can travel from trigger to panel. */
.nav-panel::after {
  content: "";
  position: absolute;
  top: -16px; left: 0; right: 0; height: 16px;
}
.nav-panel__item {
  position: relative;
  display: flex;
  align-items: flex-start;
  gap: var(--sp-3);
  padding: var(--sp-3);
  border-radius: var(--radius);
  color: var(--ink);
  text-decoration: none;
  transition: background var(--dur-fast) var(--ease-out),
              transform var(--dur-fast) var(--ease-out);
}
.nav-panel__item:hover,
.nav-panel__item:focus-visible {
  background: var(--paper-alt);
  color: var(--ink);
  text-decoration: none;
  transform: translateX(3px);
}
.nav-panel__item.is-active { background: var(--accent-soft); }
.nav-panel__ico {
  --ico-size: 1.15rem;
  flex: none;
  margin-top: .1em;
  color: var(--accent);
  transition: transform var(--dur) var(--ease-spring);
}
.nav-panel__item:hover .nav-panel__ico { transform: scale(1.14) rotate(-6deg); }
.nav-panel__label { font-family: var(--body); font-weight: 700; font-size: var(--fs-sm); line-height: 1.3; }
.nav-panel__desc  { font-size: var(--fs-xs); color: var(--ink-soft); line-height: 1.45; margin-top: .15em; }

/* --------------------------------------------------------------- actions --- */
.nav-actions { display: flex; align-items: center; gap: var(--sp-2); flex: none; }

.nav-search { position: relative; display: flex; align-items: center; }
.nav-search__input {
  width: 0;
  padding: .5em 0;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  background: var(--nav-hover);
  color: var(--nav-fg-strong);
  font-family: var(--body);
  font-size: var(--fs-sm);
  opacity: 0;
  transition: width var(--dur-slow) var(--ease-spring),
              padding var(--dur-slow) var(--ease-out),
              opacity var(--dur) var(--ease-out),
              border-color var(--dur) var(--ease-out);
}
.nav-search__input::placeholder { color: var(--nav-fg); opacity: .7; }
.nav-search.is-open .nav-search__input,
.nav-search__input:focus {
  width: clamp(150px, 18vw, 260px);
  padding: .5em .95em;
  opacity: 1;
  border-color: var(--nav-line);
  outline: none;
}
.nav-icon-btn {
  display: inline-grid;
  place-items: center;
  width: 38px; height: 38px;
  border: 1px solid var(--nav-line);
  border-radius: 50%;
  background: var(--nav-hover);
  color: var(--nav-fg-strong);
  cursor: pointer;
  transition: background var(--dur) var(--ease-out),
              border-color var(--dur) var(--ease-out),
              transform var(--dur) var(--ease-spring),
              color var(--dur) var(--ease-out);
}
.nav-icon-btn:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: #FFFCF6;
  transform: translateY(-2px);
}
.nav-icon-btn .ico { --ico-size: 1.05rem; }

.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: .5em;
  padding: .64em 1.3em;
  border-radius: var(--radius-pill);
  background: var(--accent);
  color: #FFFCF6;
  font-family: var(--body);
  font-size: var(--fs-sm);
  font-weight: 700;
  letter-spacing: .01em;
  text-decoration: none;
  white-space: nowrap;
  border: 0;
  box-shadow: 0 4px 14px rgba(30, 122, 107, .3);
  transition: transform var(--dur) var(--ease-spring),
              box-shadow var(--dur) var(--ease-out),
              background var(--dur) var(--ease-out);
}
.nav-cta:hover {
  color: #FFFCF6;
  text-decoration: none;
  background: var(--accent-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(30, 122, 107, .4);
}
.nav-cta:active { transform: translateY(0); }
@media (max-width: 575.98px) { .nav-cta span { display: none; } .nav-cta { padding: .64em .85em; } }

/* Notification bell with unread pip */
.nav-bell { position: relative; }
.nav-bell__pip {
  position: absolute;
  top: 4px; right: 4px;
  min-width: 17px; height: 17px;
  padding: 0 4px;
  display: grid; place-items: center;
  border-radius: var(--radius-pill);
  background: var(--gold);
  color: var(--deep);
  font-family: var(--body);
  font-size: .6rem; font-weight: 700; line-height: 1;
  border: 2px solid var(--deep);
  transition: border-color var(--dur-slow) var(--ease-out);
  animation: pip-in var(--dur-slow) var(--ease-spring);
}
.site-header.is-stuck .nav-bell__pip { border-color: var(--raise); }
@keyframes pip-in { from { transform: scale(0); } to { transform: scale(1); } }

/* --------------------------------------------------------- burger toggle --- */
.nav-burger { display: none; }
@media (max-width: 1199.98px) { .nav-burger { display: inline-grid; } }
.nav-burger__box { width: 18px; height: 12px; position: relative; }
.nav-burger__box span {
  position: absolute;
  left: 0; width: 100%; height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform var(--dur) var(--ease-spring), opacity var(--dur-fast) var(--ease-out);
}
.nav-burger__box span:nth-child(1) { top: 0; }
.nav-burger__box span:nth-child(2) { top: 5px; }
.nav-burger__box span:nth-child(3) { top: 10px; }
.nav-burger[aria-expanded="true"] .nav-burger__box span:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.nav-burger[aria-expanded="true"] .nav-burger__box span:nth-child(2) { opacity: 0; transform: scaleX(.3); }
.nav-burger[aria-expanded="true"] .nav-burger__box span:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }
/* While the drawer is open the burger always sits on espresso. */
body.nav-open .nav-burger { color: #FFFCF6; border-color: rgba(255, 250, 242, .25); background: rgba(255, 250, 242, .1); }

/* --------------------------------------------------------- mobile drawer --- */
.nav-drawer {
  position: fixed;
  inset: 0;
  z-index: 1035;
  display: flex;
  flex-direction: column;
  padding: calc(var(--nav-h) + var(--sp-5)) var(--sp-5) var(--sp-6);
  background: linear-gradient(165deg, var(--deep-3) 0%, var(--deep) 55%, #3A2A1C 100%);
  overflow-y: auto;
  overscroll-behavior: contain;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-12px);
  transition: opacity var(--dur-slow) var(--ease-out),
              transform var(--dur-slow) var(--ease-out),
              visibility 0s linear var(--dur-slow);
}
.nav-drawer.is-open {
  opacity: 1;
  visibility: visible;
  transform: none;
  transition-delay: 0s;
}
body.nav-open { overflow: hidden; }

.nav-drawer__section + .nav-drawer__section { margin-top: var(--sp-5); }
.nav-drawer__heading {
  font-family: var(--body);
  font-size: .66rem;
  font-weight: 700;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: var(--sp-2);
}
.nav-drawer__link {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  padding: var(--sp-3);
  border-radius: var(--radius);
  color: rgba(255, 250, 242, .88);
  font-family: var(--body);
  font-size: var(--fs-md);
  font-weight: 600;
  text-decoration: none;
  border: 1px solid transparent;
  /* Staggered entrance: --i is set per item in the markup. */
  opacity: 0;
  transform: translateY(14px);
}
.nav-drawer.is-open .nav-drawer__link {
  animation: drawer-in var(--dur-slow) var(--ease-out) forwards;
  animation-delay: calc(60ms + var(--i, 0) * 38ms);
}
@keyframes drawer-in { to { opacity: 1; transform: none; } }
.nav-drawer__link:hover,
.nav-drawer__link.is-active {
  background: rgba(255, 250, 242, .07);
  border-color: rgba(201, 168, 120, .22);
  color: #FFFCF6;
  text-decoration: none;
}
.nav-drawer__link .ico { --ico-size: 1.15rem; color: var(--gold); }
.nav-drawer__footer {
  margin-top: auto;
  padding-top: var(--sp-5);
  border-top: 1px solid rgba(255, 250, 242, .12);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--sp-4);
  color: rgba(255, 250, 242, .55);
  font-size: var(--fs-xs);
}
.nav-drawer__footer a { color: rgba(255, 250, 242, .72); }
.nav-drawer__search { margin-bottom: var(--sp-5); }
.nav-drawer__search input {
  width: 100%;
  padding: var(--sp-3) var(--sp-4);
  border-radius: var(--radius-pill);
  border: 1px solid rgba(201, 168, 120, .28);
  background: rgba(255, 250, 242, .07);
  color: #FFFCF6;
  font-family: var(--body);
  font-size: var(--fs-base);
}
.nav-drawer__search input::placeholder { color: rgba(255, 250, 242, .45); }

/* ------------------------------------------------------- scroll progress --- */
.nav-progress {
  position: absolute;
  left: 0; bottom: 0;
  height: 2px;
  width: 100%;
  transform: scaleX(var(--p, 0));
  transform-origin: left;
  background: linear-gradient(90deg, var(--accent), var(--gold));
  opacity: 0;
  transition: opacity var(--dur) var(--ease-out);
  pointer-events: none;
}
.site-header.is-stuck .nav-progress { opacity: .9; }