/* ==========================================================================
   HIMALAYAN OBSERVATORY KAUSANI
   site.css — shared chrome: loader, cursor, navigation, footer,
   lightbox, FAQ, and reusable cinematic components
   ========================================================================== */

/* ==========================================================================
   1. LOADING EXPERIENCE
   Black. Stars emerge. Wordmark resolves. No spinner.
   Compact and quiet: a small mark, a hairline lockup, a thin progress rule.
   ========================================================================== */
.loader {
  position: fixed; inset: 0; z-index: var(--z-loader);
  display: grid; place-items: center;
  background: var(--void);
  overflow: hidden;
  transition: opacity 700ms var(--ease), visibility 700ms var(--ease);
}
.loader.is-done { opacity: 0; visibility: hidden; pointer-events: none; }

/* stars emerge as the bar fills, not only at the very end */
.loader__sky { position: absolute; inset: 0; opacity: 0; transition: opacity 2000ms var(--ease) 120ms; }
.loader.is-live .loader__sky,
.loader.is-lit .loader__sky { opacity: 1; }

.loader__inner {
  position: relative; z-index: 2;
  display: grid; justify-items: center;
  width: min(260px, 72vw);
  gap: 0.85rem;
  text-align: center;
  /* visible while the bar fills -- gated on is-lit this left the screen
     black for the whole progress phase */
  opacity: 0; transform: translateY(6px);
  transition: opacity 500ms var(--ease), transform 700ms var(--ease);
}
.loader.is-live .loader__inner { opacity: 1; transform: none; }

/* the mark sits on its cream badge but small -- an emblem, not a billboard */
.loader__mark {
  width: 44px; height: auto;
  border-radius: 3px;
  opacity: 0; transform: translateY(6px) scale(0.95);
  transition: opacity 500ms var(--ease) 80ms, transform 700ms var(--ease) 80ms;
}
.loader.is-live .loader__mark { opacity: 1; transform: none; }

.loader__word {
  display: grid; gap: 0.28rem;
  opacity: 0; transform: translateY(8px);
  transition: opacity 500ms var(--ease) 160ms, transform 700ms var(--ease) 160ms;
}
.loader.is-live .loader__word { opacity: 1; transform: none; }

.loader__bar {
  position: relative; width: 100%; height: 1px;
  background: var(--edge); overflow: hidden;
  opacity: 0;
  transition: opacity 500ms var(--ease) 260ms;
}
.loader.is-live .loader__bar { opacity: 1; }

.loader__word b {
  font-family: var(--serif); font-weight: 400;
  font-size: 0.6875rem;
  letter-spacing: 0.32em; text-transform: uppercase; color: var(--text);
}
.loader__word span {
  font-size: 0.5rem; font-weight: 500;
  letter-spacing: var(--ls-hair); text-transform: uppercase; color: var(--gold);
}

.loader__bar {
  position: relative; width: 100%; height: 1px;
  background: var(--edge); overflow: hidden;
}
.loader__bar i {
  position: absolute; inset: 0; transform-origin: left;
  transform: scaleX(0);
  background: linear-gradient(90deg, var(--gold-dk), var(--gold-lt));
  transition: transform 420ms var(--ease-io);
}
.loader__foot {
  display: flex; justify-content: space-between; width: 100%;
  font-size: 0.5rem; letter-spacing: var(--ls-hair);
  text-transform: uppercase; color: var(--dim);
}
.loader__pct { font-variant-numeric: tabular-nums; }

/* ==========================================================================
   2. CUSTOM CURSOR (pointer devices only, never in reduced-motion)
   ========================================================================== */
.cursor {
    display: none;
    /* starts hidden: the JS shows it on first pointermove, so it never
       flashes at the 0,0 origin before the mouse is tracked */
    opacity: 0;
  }

@media (hover: hover) and (pointer: fine) and (prefers-reduced-motion: no-preference) {
  .cursor {
    display: block;
    position: fixed; top: 0; left: 0;
    z-index: var(--z-cursor);
    pointer-events: none;
    mix-blend-mode: difference;
  }
  .cursor__dot,
  .cursor__ring {
    position: absolute; top: 0; left: 0;
    border-radius: 50%;
    transform: translate(-50%, -50%);
  }
  .cursor__dot {
    width: 5px; height: 5px;
    background: #fff;
    transition: opacity var(--d-2) var(--ease);
  }
  .cursor__ring {
    width: 34px; height: 34px;
    border: 1px solid rgba(255, 255, 255, 0.55);
    transition: width var(--d-2) var(--ease), height var(--d-2) var(--ease),
                border-color var(--d-2) var(--ease), opacity var(--d-2) var(--ease),
                background-color var(--d-2) var(--ease);
  }
  .cursor.is-link .cursor__ring {
    width: 58px; height: 58px;
    border-color: rgba(255, 255, 255, 0.85);
    background: rgba(255, 255, 255, 0.08);
  }
  .cursor.is-hide { opacity: 0; }

  /* hide the OS pointer only where the custom one is live */
  html.has-cursor,
  html.has-cursor a,
  html.has-cursor button { cursor: none; }
  html.has-cursor input,
  html.has-cursor textarea { cursor: auto; }
}

/* ==========================================================================
   3. NAVIGATION — floating glass bar, transparent at rest
   ========================================================================== */
/* nav sits above the mobile sheet so the close control stays reachable */
.nav {
  position: fixed; top: 0; left: 0; right: 0;
  z-index: 450;
  padding-block: clamp(0.9rem, 1.8vw, 1.5rem);
  transition: padding var(--d-3) var(--ease), transform var(--d-3) var(--ease);
}
/* while the sheet is open the bar needs its own ground to stay legible */
.nav.is-menu .nav__in {
  background: rgba(6, 9, 18, 0.92);
  backdrop-filter: blur(20px) saturate(140%);
  -webkit-backdrop-filter: blur(20px) saturate(140%);
  border-color: var(--edge);
}
.nav__in {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: var(--s-lg);
  padding: 0.65rem 0.65rem 0.65rem 1.1rem;
  border: 1px solid transparent;
  border-radius: var(--r-pill);
  transition: background var(--d-3) var(--ease), border-color var(--d-3) var(--ease),
              box-shadow var(--d-3) var(--ease), backdrop-filter var(--d-3) var(--ease);
}

/* the glass state */
.nav.is-stuck .nav__in {
  background: rgba(6, 9, 18, 0.62);
  backdrop-filter: blur(20px) saturate(140%);
  -webkit-backdrop-filter: blur(20px) saturate(140%);
  border-color: var(--edge);
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.5);
}
.nav.is-stuck { padding-block: 0.55rem; }
.nav.is-hidden { transform: translateY(-120%); }

.nav__brand {
  display: inline-flex; align-items: center; gap: 0.7rem;
  flex: none;
}
.nav__mark {
  /* the client's logo is landscape (640x452) -- a circular frame crops it to
     an unreadable sliver, so it sits in a soft cream-edged pill instead */
  width: 54px; height: 38px; flex: none;
  border-radius: var(--r-sm);
  border: 1px solid rgba(242, 239, 234, 0.28);
  background: #f2efea;
  padding: 3px;
  transition: border-color var(--d-2) var(--ease), box-shadow var(--d-2) var(--ease);
}
.nav__brand:hover .nav__mark {
  border-color: var(--gold);
  box-shadow: 0 0 0 3px var(--gold-wash);
}
.nav__mark img { width: 100%; height: 100%; object-fit: contain; }

.nav__name { display: grid; line-height: 1.12; }
.nav__name b {
  font-family: var(--serif); font-weight: 500;
  font-size: 0.82rem; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--text); white-space: nowrap;
}
.nav__name span {
  font-size: 0.55rem; font-weight: 500; letter-spacing: var(--ls-hair);
  text-transform: uppercase; color: var(--faint);
}

.nav__links { display: flex; align-items: center; justify-content: center; gap: clamp(0.6rem, 1.6vw, 1.7rem); }
.nav__link {
  position: relative;
  padding: 0.4rem 0.2rem;
  font-size: var(--fs-micro); font-weight: 500;
  letter-spacing: var(--ls-wide); text-transform: uppercase;
  color: var(--muted); white-space: nowrap;
  transition: color var(--d-2) var(--ease);
}
.nav__link::after {
  content: ""; position: absolute; left: 0; bottom: 0;
  width: 100%; height: 1px; background: var(--gold);
  transform: scaleX(0); transform-origin: right;
  transition: transform var(--d-2) var(--ease);
}
.nav__link:hover { color: var(--text); }
.nav__link:hover::after { transform: scaleX(1); transform-origin: left; }
.nav__link[aria-current="page"] { color: var(--gold); }
.nav__link[aria-current="page"]::after { transform: scaleX(1); }

.nav__cta { flex: none; }
.nav__cta .btn { padding: 0.8rem 1.4rem; font-size: var(--fs-micro); }

.nav__burger {
  display: none;
  place-items: center;
  width: 42px; height: 42px; flex: none;
  border: 1px solid var(--edge); border-radius: 50%;
}
.nav__burger i {
  position: relative; display: block;
  width: 17px; height: 1px; background: var(--text);
  transition: transform var(--d-2) var(--ease), background var(--d-2) var(--ease);
}
.nav__burger i::before,
.nav__burger i::after {
  content: ""; position: absolute; left: 0;
  width: 17px; height: 1px; background: var(--text);
  transition: transform var(--d-2) var(--ease), top var(--d-2) var(--ease);
}
.nav__burger i::before { top: -5px; }
.nav__burger i::after  { top: 5px; }
.nav__burger[aria-expanded="true"] i { background: transparent; }
.nav__burger[aria-expanded="true"] i::before { top: 0; transform: rotate(45deg); }
.nav__burger[aria-expanded="true"] i::after  { top: 0; transform: rotate(-45deg); }

/* mobile sheet */
.nav__sheet {
  position: fixed; inset: 0; z-index: var(--z-menu);
  display: grid; align-content: center; gap: 0.4rem;
  padding: 6rem var(--pad) 3rem;
  background: rgba(3, 5, 12, 0.96);
  backdrop-filter: blur(24px); -webkit-backdrop-filter: blur(24px);
  opacity: 0; visibility: hidden;
  transition: opacity var(--d-3) var(--ease), visibility var(--d-3) var(--ease);
}
.nav__sheet.is-open { opacity: 1; visibility: visible; }
.nav__sheet a:not(.btn) {
  display: block; padding: 0.55rem 0;
  font-family: var(--serif); font-size: clamp(1.7rem, 8vw, 2.6rem);
  line-height: 1.12; color: var(--text);
  opacity: 0; transform: translateY(18px);
  transition: opacity 600ms var(--ease), transform 600ms var(--ease), color var(--d-2) var(--ease);
}
.nav__sheet.is-open a:not(.btn) { opacity: 1; transform: none; }
.nav__sheet a:not(.btn)[aria-current="page"] { color: var(--gold); }
.nav__sheet a:not(.btn):hover { color: var(--gold); }

/* the CTA keeps button metrics — without this it inherits the display serif
   above and the label clips off the right edge */
.nav__sheet .btn {
  font-family: var(--sans);
  font-size: var(--fs-micro);
  white-space: normal;
  text-align: center;
  max-width: 100%;
}

/* ==========================================================================
   4. SCROLL PROGRESS
   ========================================================================== */
.progress {
  position: fixed; top: 0; left: 0; right: 0; height: 2px;
  z-index: var(--z-nav); background: transparent; pointer-events: none;
}
.progress i {
  display: block; height: 100%;
  background: linear-gradient(90deg, var(--gold-dk), var(--gold), var(--gold-lt));
  transform: scaleX(0); transform-origin: left;
}

/* ==========================================================================
   5. ATMOSPHERIC BACKGROUNDS — per-section environments
   ========================================================================== */
/* overflow:clip contains the -20% wash without creating a scroll container */
.env { position: relative; isolation: isolate; overflow: clip; }
.env--night    { background: var(--night); }
.env--abyss    { background: var(--abyss); }
.env--deep     { background: var(--deep); }
.env--slate    { background: var(--slate); }
.env--twilight { background: var(--twilight); }
.env--void     { background: var(--void); }

/* slow drifting nebular wash, sits behind content */
.env__wash {
  position: absolute; inset: -20%;
  z-index: -1; pointer-events: none;
  background:
    radial-gradient(38% 42% at 18% 24%, rgba(88, 118, 220, 0.16), transparent 62%),
    radial-gradient(34% 38% at 82% 68%, rgba(150, 96, 200, 0.12), transparent 64%),
    radial-gradient(46% 40% at 50% 110%, rgba(201, 169, 97, 0.07), transparent 66%);
  filter: blur(28px);
  animation: drift 34s var(--ease-drift) infinite alternate;
}
@keyframes drift {
  from { transform: translate3d(-3%, -2%, 0) scale(1.02); }
  to   { transform: translate3d(3%, 3%, 0) scale(1.09); }
}

/* procedural ridge silhouettes layered into depth */
.ridges { position: absolute; left: 0; right: 0; bottom: 0; z-index: 0; pointer-events: none; }
.ridges svg { display: block; width: 100%; height: auto; }

/* ==========================================================================
   6. GLASS PANEL
   ========================================================================== */
.glass {
  background: rgba(255, 255, 255, 0.028);
  border: 1px solid var(--edge);
  border-radius: var(--r-lg);
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
}

/* ==========================================================================
   7. LIGHTBOX
   ========================================================================== */
.lightbox {
  position: fixed; inset: 0; z-index: var(--z-light);
  display: grid; grid-template-rows: auto 1fr auto;
  padding: clamp(1rem, 3vw, 2.2rem);
  background: rgba(2, 3, 8, 0.96);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  opacity: 0; visibility: hidden;
  transition: opacity var(--d-3) var(--ease), visibility var(--d-3) var(--ease);
}
.lightbox.is-open { opacity: 1; visibility: visible; }

.lightbox__bar { display: flex; align-items: center; justify-content: space-between; gap: var(--s-sm); }
.lightbox__count {
  font-size: var(--fs-micro); letter-spacing: var(--ls-wide);
  color: var(--faint); font-variant-numeric: tabular-nums;
}
.lightbox__close {
  display: grid; place-items: center;
  width: 44px; height: 44px;
  border: 1px solid var(--edge); border-radius: 50%;
  color: var(--text);
  transition: color var(--d-2) var(--ease), border-color var(--d-2) var(--ease),
              transform var(--d-2) var(--ease);
}
.lightbox__close:hover { color: var(--gold); border-color: var(--gold); transform: rotate(90deg); }

.lightbox__stage {
  display: grid; place-items: center;
  min-height: 0; padding: var(--s-md) 0;
  overflow: hidden;
}
.lightbox__img {
  max-width: 100%; max-height: 100%;
  object-fit: contain;
  transform: scale(0.96); opacity: 0;
  transition: transform var(--d-4) var(--ease), opacity var(--d-4) var(--ease);
  box-shadow: 0 40px 120px rgba(0, 0, 0, 0.8);
}
.lightbox__img.is-in { transform: scale(1); opacity: 1; }

.lightbox__nav {
  display: flex; align-items: center; justify-content: center; gap: var(--s-md);
}
.lightbox__nav button {
  display: grid; place-items: center;
  width: 46px; height: 46px;
  border: 1px solid var(--edge); border-radius: 50%;
  color: var(--text); font-size: var(--fs-sm);
  transition: color var(--d-2) var(--ease), border-color var(--d-2) var(--ease);
}
.lightbox__nav button:hover { color: var(--gold); border-color: var(--gold); }

.lightbox__cap { text-align: center; font-size: var(--fs-xs); color: var(--muted); margin-top: var(--s-2xs); }

/* ==========================================================================
   8. FAQ ACCORDION
   ========================================================================== */
.faq { border-top: 1px solid var(--edge); }
.faq__item { border-bottom: 1px solid var(--edge); }

.faq__q {
  /* question + toggle only: the old serial-number column is gone */
  display: grid; grid-template-columns: 1fr auto;
  align-items: start; gap: var(--s-md);
  width: 100%; padding: clamp(1.4rem, 3vw, 2.4rem) 0;
  text-align: left; color: var(--text);
  transition: color var(--d-2) var(--ease);
}
.faq__q:hover { color: var(--gold-lt); }

.faq__qt {
  font-family: var(--serif); font-weight: 300;
  font-size: clamp(1.2rem, 2.3vw, 1.85rem);
  line-height: 1.22; letter-spacing: -0.008em;
}
.faq__sign {
  position: relative; width: 15px; height: 15px; margin-top: 0.7em; flex: none;
}
.faq__sign::before,
.faq__sign::after {
  content: ""; position: absolute; inset: 50% 0 auto 0;
  height: 1px; background: var(--gold);
  transform: translateY(-50%);
  transition: transform var(--d-3) var(--ease), opacity var(--d-3) var(--ease);
}
.faq__sign::after { transform: translateY(-50%) rotate(90deg); }
.faq__q[aria-expanded="true"] .faq__sign::after { transform: translateY(-50%) rotate(0deg); opacity: 0; }

.faq__a {
  display: grid; grid-template-rows: 0fr;
  transition: grid-template-rows var(--d-3) var(--ease);
}
.faq__item.is-open .faq__a { grid-template-rows: 1fr; }
.faq__a > div { overflow: hidden; }
.faq__a p {
  max-width: 68ch; padding: 0 clamp(0rem, 0rem, 0rem) 0 0;
  color: var(--muted); font-size: var(--fs-base);
  opacity: 0; transform: translateY(8px);
  transition: opacity var(--d-3) var(--ease), transform var(--d-3) var(--ease);
  margin-bottom: clamp(1.4rem, 3vw, 2.2rem);
  margin-left: calc(var(--fs-micro) + var(--s-md));
}
.faq__item.is-open .faq__a p { opacity: 1; transform: none; }

/* ==========================================================================
   9. FOOTER
   ========================================================================== */
.foot {
  position: relative; z-index: var(--z-deep);
  padding-top: var(--s-3xl);
  padding-bottom: var(--s-xl);
  border-top: 1px solid var(--edge);
  background: var(--void);
  overflow: hidden;
}
.foot__mark {
  position: relative; z-index: var(--z-content);
  display: grid; gap: var(--s-xl);
  padding-bottom: var(--s-2xl);
}
.foot__name {
  font-family: var(--serif); font-weight: 300;
  font-size: var(--fs-3xl); line-height: 1.02;
  letter-spacing: 0.01em; text-transform: uppercase;
}
.foot__name em {
  display: block; font-style: normal; color: var(--gold);
}
.foot__grid {
  position: relative; z-index: var(--z-content);
  display: grid;
  grid-template-columns: 1.3fr repeat(3, minmax(0, 1fr));
  gap: var(--s-xl) var(--s-lg);
  padding-top: var(--s-xl);
  border-top: 1px solid var(--edge);
}
.foot__h {
  font-size: var(--fs-micro); font-weight: 500;
  letter-spacing: var(--ls-hair); text-transform: uppercase;
  color: var(--gold); margin-bottom: var(--s-sm);
}
.foot__list { display: grid; gap: 0.55rem; }
.foot__list a,
.foot__list span {
  font-size: var(--fs-sm); color: var(--muted);
  transition: color var(--d-2) var(--ease);
}
.foot__list a:hover { color: var(--gold-lt); }
.foot__tag { font-size: var(--fs-sm); color: var(--faint); max-width: 34ch; }

.foot__social { display: flex; gap: 0.5rem; }
.foot__social a {
  display: grid; place-items: center;
  width: 40px; height: 40px;
  border: 1px solid var(--edge); border-radius: 50%;
  color: var(--muted);
  transition: color var(--d-2) var(--ease), border-color var(--d-2) var(--ease),
              background var(--d-2) var(--ease), transform var(--d-2) var(--ease);
}
.foot__social a:hover {
  color: var(--gold); border-color: var(--gold);
  background: var(--gold-wash); transform: translateY(-3px);
}
.foot__social svg { width: 17px; height: 17px; }

.foot__bar {
  position: relative; z-index: var(--z-content);
  display: flex; flex-wrap: wrap; align-items: center;
  justify-content: space-between; gap: var(--s-sm);
  margin-top: var(--s-xl); padding-top: var(--s-md);
  border-top: 1px solid var(--edge);
  font-size: var(--fs-xs); color: var(--dim);
}
.foot__bar a { transition: color var(--d-2) var(--ease); }
.foot__bar a:hover { color: var(--gold); }

/* ==========================================================================
   10. BACK TO TOP
   ========================================================================== */
.to-top {
  position: fixed; right: var(--pad); bottom: var(--pad);
  z-index: var(--z-sticky, 250);
  display: grid; place-items: center;
  width: 46px; height: 46px;
  border: 1px solid var(--edge); border-radius: 50%;
  background: rgba(6, 9, 18, 0.7);
  backdrop-filter: blur(10px);
  color: var(--muted);
  opacity: 0; visibility: hidden; transform: translateY(10px);
  transition: opacity var(--d-2) var(--ease), visibility var(--d-2) var(--ease),
              transform var(--d-2) var(--ease), color var(--d-2) var(--ease),
              border-color var(--d-2) var(--ease);
}
.to-top.is-on { opacity: 1; visibility: visible; transform: none; }
.to-top:hover { color: var(--gold); border-color: var(--gold); }

/* ==========================================================================
   FLOATING CONTACT — call + WhatsApp
   Stacked above the back-to-top button in the bottom-right. Both are real
   links (tel: and wa.me), so they work with JavaScript disabled and never
   depend on the form.
   ========================================================================== */
.fab {
  position: fixed; right: var(--pad);
  /* clear the back-to-top button, and honour the iPhone home indicator */
  bottom: calc(var(--pad) + 46px + 14px + env(safe-area-inset-bottom, 0px));
  z-index: calc(var(--z-sticky, 250) + 5);
  display: flex; flex-direction: column; align-items: center; gap: 10px;
}
.fab__btn {
  display: grid; place-items: center;
  width: 54px; height: 54px;
  border-radius: 50%;
  background: rgba(6, 9, 18, 0.78);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--edge);
  color: var(--muted);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.45);
  transition: transform var(--d-2) var(--ease), background var(--d-2) var(--ease),
              color var(--d-2) var(--ease), border-color var(--d-2) var(--ease);
}
.fab__btn:hover, .fab__btn:focus-visible {
  transform: translateY(-2px);
  color: var(--text);
  border-color: transparent;
}
/* WhatsApp green, the one place the brand allows a saturated colour */
.fab__btn--wa { background: #1f9c52; border-color: #1f9c52; color: #fff; }
.fab__btn--wa:hover, .fab__btn--wa:focus-visible { background: #25c163; }
.fab__btn--call:hover, .fab__btn--call:focus-visible {
  background: var(--gold); color: #14100a;
}

/* the WhatsApp button used inline, e.g. on the contact page */
.btn--wa {
  border: 1px solid #1f9c52; color: #6fe0a4; background: transparent;
}
.btn--wa:hover, .btn--wa:focus-visible { background: #1f9c52; color: #fff; }

@media (max-width: 560px) {
  .fab { gap: 8px; }
  .fab__btn { width: 48px; height: 48px; }
  .fab__btn svg { width: 19px; height: 19px; }
}