/* === RIS Nav: Crystal Scroll Hybrid =========================== */
:root {
  --nav-bg: rgba(60, 40, 20, 0.6);     /* semi-glass parchment brown */
  --nav-border: #d4af37;               /* golden border */
  --nav-maxw: 1100px;

  --tab-bg: rgba(255,255,255,0.12);    /* glass base */
  --tab-bg-hover: rgba(255,255,255,0.25);
  --tab-text: #ffeebf;                 /* parchment gold text */
  --tab-border: #e6c980;
  --tab-glow: rgba(255, 200, 100, 0.35);
  /*--tab-active-gradient: linear-gradient(135deg,#ffd97b,#e6b84e);*/
  --tab-active-gradient: linear-gradient(145deg, #ffe58f, #ffb347);

}

/* Wrapper bar */
.site-nav {
  background: var(--nav-bg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 3px solid var(--nav-border);
  box-shadow: 0 6px 18px rgba(0,0,0,.45);
  padding: 18px 24px;
  margin: 0 0 30px;
}

/* Inner container */
.site-nav__inner {
  max-width: var(--nav-maxw);
  margin: 0 auto;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  gap: 14px;
}

/* Tabs */
.site-nav a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  border-radius: 12px;
  font-weight: 700;
  color: var(--tab-text);
  text-decoration: none;

  background: var(--tab-bg);
  border: 2px solid var(--tab-border);
  box-shadow:
    0 2px 6px rgba(0,0,0,.5),
    inset 0 0 6px rgba(255,255,255,.05);
  transition: all .2s ease;
}

/* Hover: glow & lift */
.site-nav a:hover {
  background: var(--tab-bg-hover);
  color: #fff9d8;
  box-shadow:
    0 0 10px var(--tab-glow),
    0 4px 14px rgba(0,0,0,.6);
  transform: translateY(-2px);
}

/* Active / current tab */
.site-nav a.is-active,
.site-nav a[aria-current="page"] {
  position: relative;
  overflow: hidden;
  background: var(--tab-active-gradient);
  color: #2d1b0f;
  border-color: #fff2b0;
  box-shadow:
    0 0 14px var(--tab-glow),
    inset 0 0 8px rgba(255,255,255,.2);
}

/* Gold shimmer sweep animation for active tab */
.site-nav a.is-active::after,
.site-nav a[aria-current="page"]::after {
  content: "";
  position: absolute;
  top: -20%;
  bottom: -20%;
  left: -40%;
  width: 60%;
  pointer-events: none;

  background: linear-gradient(
    120deg,
    rgba(255, 255, 255, 0) 20%,
    rgba(255, 240, 200, 0.55) 45%,
    rgba(255, 255, 255, 0) 70%
  );

  transform: translateX(-140%) rotate(8deg);
  animation: risShine 2.8s cubic-bezier(.25,.1,.25,1) infinite;
  mix-blend-mode: screen;
}

@keyframes risShine {
  0%   { transform: translateX(-140%) rotate(8deg); }
  60%  { transform: translateX(140%)  rotate(8deg); }
  100% { transform: translateX(140%)  rotate(8deg); }
}

/* Pressed state */
.site-nav a:active {
  transform: translateY(1px);
  box-shadow: inset 0 2px 8px rgba(0,0,0,.6);
}

/* Mobile layout */
@media (max-width: 640px) {
  .site-nav__inner { gap: 12px; }
  .site-nav a {
    width: 100%;
    max-width: 420px;
    text-align: center;
  }
}

/* Accessibility: respect reduced motion */
@media (prefers-reduced-motion: reduce) {
  .site-nav a.is-active::after,
  .site-nav a[aria-current="page"]::after {
    animation: none;
    opacity: 0;
  }
}
.site-nav a:active {
  transform: translateY(2px) scale(0.98);
}