/* ============================================================
   nav.css — RAYHEN A{I}CADEMY sub-site navigation
   Sticky top bar · brand left · Home / Workshops / Mentoring / Raimund
   ============================================================ */

.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 0 clamp(20px, 5vw, 48px);
  height: 64px;
  background: rgba(245, 242, 238, 0.82);
  backdrop-filter: saturate(1.1) blur(14px);
  -webkit-backdrop-filter: saturate(1.1) blur(14px);
  border-bottom: 1px solid var(--hairline-faint);
}

.site-nav__brand {
  display: inline-flex;
  align-items: baseline;
  gap: 0.35em;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 1.18rem;
  letter-spacing: var(--track-hero);
  text-transform: uppercase;
  color: var(--ink);
  text-decoration: none;
  white-space: nowrap;
}
.site-nav__brand b { font-weight: 500; }
.site-nav__brand .brand-i { color: var(--copper); font-style: normal; }
.site-nav__brand .brand-sub {
  font-family: var(--font-sans);
  font-weight: 400;
  font-size: 0.56rem;
  letter-spacing: var(--track-label);
  text-transform: uppercase;
  color: var(--ink-muted);
}

.site-nav__links {
  display: flex;
  align-items: center;
  gap: clamp(14px, 2.4vw, 30px);
}

.site-nav__links a {
  position: relative;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.72rem;
  letter-spacing: var(--track-loose);
  text-transform: uppercase;
  color: var(--ink-soft);
  text-decoration: none;
  padding: 6px 0;
  transition: color var(--dur) var(--ease);
}
.site-nav__links a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 100%;
  height: 1px;
  background: var(--copper);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur) var(--ease);
}
.site-nav__links a:hover { color: var(--ink); }
.site-nav__links a:hover::after { transform: scaleX(1); }

.site-nav__links a.is-active {
  color: var(--copper);
}
.site-nav__links a.is-active::after {
  transform: scaleX(1);
}

/* ── Burger button (hidden on desktop) ───────────────────── */
.site-nav__burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  margin: 0 -10px 0 0;
  padding: 0;
  background: none;
  border: 0;
  cursor: pointer;
  flex-shrink: 0;
}
.site-nav__burger span {
  display: block;
  width: 24px;
  height: 2px;
  margin: 0 auto;
  background: var(--ink);
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}

@media (max-width: 760px) {
  .site-nav {
    position: sticky;
    height: 60px;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 0 clamp(16px, 6vw, 24px);
  }
  .site-nav__burger { display: flex; }

  .site-nav__links {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: rgba(245, 242, 238, 0.97);
    backdrop-filter: saturate(1.1) blur(14px);
    -webkit-backdrop-filter: saturate(1.1) blur(14px);
    border-bottom: 1px solid var(--hairline-faint);
    box-shadow: 0 18px 40px rgba(26, 23, 20, 0.14);
    padding: 0 clamp(16px, 6vw, 24px);
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    pointer-events: none;
    transition: max-height var(--dur) var(--ease), opacity var(--dur) var(--ease), padding var(--dur) var(--ease);
  }
  .site-nav.is-open .site-nav__links {
    max-height: 70vh;
    opacity: 1;
    pointer-events: auto;
    padding: 4px clamp(16px, 6vw, 24px) 12px;
  }
  .site-nav__links a {
    width: 100%;
    padding: 14px 0;
    font-size: 0.82rem;
    border-bottom: 1px solid var(--hairline-faint);
  }
  .site-nav__links a:last-child { border-bottom: 0; }
  .site-nav__links a::after { display: none; }

  /* burger → X when open */
  .site-nav.is-open .site-nav__burger span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .site-nav.is-open .site-nav__burger span:nth-child(2) { opacity: 0; }
  .site-nav.is-open .site-nav__burger span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
}