/* ==========================================================================
   Navigation — fixed bar, small-caps links, full-screen menu on phones
   ========================================================================== */

.nav {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 500;
  height: var(--nav-h);
  padding: 0 var(--pad);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  transition: background-color 0.5s var(--ease-out), backdrop-filter 0.5s var(--ease-out), border-color 0.5s var(--ease-out);
  border-bottom: 1px solid transparent;
}

.nav::before {
  content: '';
  position: absolute;
  inset: 0 0 -40px 0;
  z-index: -1;
  background: linear-gradient(180deg, rgba(9, 6, 4, 0.72) 0%, rgba(9, 6, 4, 0) 100%);
  pointer-events: none;
  transition: opacity 0.5s var(--ease-out);
}

.nav.is-scrolled {
  background: rgba(11, 7, 5, 0.66);
  -webkit-backdrop-filter: blur(16px) saturate(1.3);
  backdrop-filter: blur(16px) saturate(1.3);
  border-bottom-color: rgba(199, 163, 93, 0.14);
}

.nav.is-scrolled::before {
  opacity: 0;
}

.nav__logo {
  flex: none;
  display: block;
  transition: opacity 0.3s;
}

.nav__logo img {
  width: auto;
  height: 30px;
}

@media (min-width: 900px) {
  .nav__logo img {
    height: 35px;
  }
}

.nav__links {
  display: none;
  align-items: center;
  gap: clamp(1.1rem, 2.4vw, 2.6rem);
}

.nav__links a {
  position: relative;
  padding: 0.6rem 0;
  font-size: 0.7rem;
  font-weight: 400;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: rgba(248, 246, 242, 0.74);
  transition: color 0.35s var(--ease-out);
}

.nav__links a::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0.24em;
  bottom: 0.2rem;
  height: 1px;
  background: var(--gold);
  transform: scaleX(0);
  transform-origin: 100% 50%;
  transition: transform 0.5s var(--ease-out);
}

.nav__links a:hover,
.nav__links a[aria-current='true'] {
  color: var(--cream);
}

.nav__links a:hover::after,
.nav__links a[aria-current='true']::after {
  transform: scaleX(1);
  transform-origin: 0% 50%;
}

.nav__links a.nav__book {
  padding: 0.7rem 1.25rem 0.7rem 1.45rem;
  color: var(--gold-light);
  border: 1px solid rgba(199, 163, 93, 0.55);
  border-radius: 999px;
  transition: color 0.4s var(--ease-out), background-color 0.4s var(--ease-out), border-color 0.4s var(--ease-out);
}

.nav__links a.nav__book::after {
  display: none;
}

.nav__links a.nav__book:hover,
.nav__links a.nav__book[aria-current='true'] {
  color: var(--ink);
  background: var(--gold);
  border-color: var(--gold);
}

@media (min-width: 900px) {
  .nav__links {
    display: flex;
  }
}

/* ---------- burger ---------- */

.nav__toggle {
  position: relative;
  z-index: 2;
  width: 46px;
  height: 46px;
  margin-right: -10px;
  display: grid;
  place-items: center;
  -webkit-tap-highlight-color: transparent;
}

.nav__toggle span {
  position: absolute;
  width: 26px;
  height: 1.5px;
  background: var(--cream);
  transition: transform 0.5s var(--ease-out), background-color 0.3s;
}

.nav__toggle span:first-child {
  transform: translateY(-4.5px);
}

.nav__toggle span:last-child {
  transform: translateY(4.5px);
}

.nav__toggle[aria-expanded='true'] span:first-child {
  transform: rotate(45deg);
}

.nav__toggle[aria-expanded='true'] span:last-child {
  transform: rotate(-45deg);
}

@media (min-width: 900px) {
  .nav__toggle {
    display: none;
  }
}

/* ---------- full-screen menu ---------- */

.menu {
  position: fixed;
  inset: 0;
  z-index: 480;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: calc(var(--nav-h) + 4vh) var(--pad) max(2rem, env(safe-area-inset-bottom));
  background: radial-gradient(120% 70% at 100% 0%, #3a2110 0%, #170d06 46%, #0a0604 100%);
  clip-path: inset(0 0 100% 0);
  visibility: hidden;
  transition: clip-path 0.8s var(--ease-in-out), visibility 0s 0.8s;
  overflow-y: auto;
}

.menu.is-open {
  clip-path: inset(0);
  visibility: visible;
  transition: clip-path 0.8s var(--ease-in-out), visibility 0s;
}

.menu__links {
  display: flex;
  flex-direction: column;
}

.menu__links a {
  display: flex;
  align-items: baseline;
  gap: 1.1rem;
  padding: 0.55rem 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(2.1rem, 10.5vw, 3.4rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
  border-bottom: 1px solid var(--line-soft);
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.6s var(--ease-out), transform 0.8s var(--ease-out);
}

.menu__links a span {
  font-family: var(--font-body);
  font-size: 0.66rem;
  font-weight: 500;
  letter-spacing: 0.24em;
  color: var(--gold);
  transform: translateY(-0.9em);
}

.menu__links a em {
  font-style: italic;
  color: var(--gold);
}

.menu.is-open .menu__links a {
  opacity: 1;
  transform: none;
}

.menu.is-open .menu__links a:nth-child(1) { transition-delay: 0.25s; }
.menu.is-open .menu__links a:nth-child(2) { transition-delay: 0.3s; }
.menu.is-open .menu__links a:nth-child(3) { transition-delay: 0.35s; }
.menu.is-open .menu__links a:nth-child(4) { transition-delay: 0.4s; }
.menu.is-open .menu__links a:nth-child(5) { transition-delay: 0.45s; }
.menu.is-open .menu__links a:nth-child(6) { transition-delay: 0.5s; }
.menu.is-open .menu__links a:nth-child(7) { transition-delay: 0.55s; }

.menu__foot {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem 1.6rem;
  margin-top: 2.5rem;
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--text-soft);
}

.menu__foot a {
  color: var(--gold-light);
}

@media (min-width: 900px) {
  .menu {
    display: none;
  }
}