/* Vang Vieng Adventures — homepage immersiva
   Palette, caratteri, motivo tessile e grana vengono dal sito originale. */

*,
*::before,
*::after {
  box-sizing: border-box;
}

:root {
  /* Palette */
  --cream:        #F1E7D2;   /* carta di riso */
  --lacquer:      #8F2F24;   /* rosso lacca — solo accento */
  --saffron:      #D7A63A;   /* zafferano — solo accento */
  --jade:         #2F5144;
  --ink:          #24211D;   /* quasi nero caldo */

  --ink-15: rgba(36, 33, 29, .15);
  --cream-80: rgba(241, 231, 210, .8);

  /* Caratteri */
  --serif: "Instrument Serif", "Times New Roman", Georgia, serif;
  --sans:  "Manrope", system-ui, -apple-system, "Segoe UI", sans-serif;
  --display: "Cocomat Pro", "Manrope", system-ui, sans-serif;
  --title: "Montserrat Alternates", "Manrope", system-ui, sans-serif;

  --fs-body: clamp(15px, 1.05vw, 17px);

  /* Spazi */
  --gutter:   clamp(20px, 5vw, 76px);
  --space-s:  clamp(16px, 2vw, 28px);
  --space-m:  clamp(32px, 4vw, 64px);
  --space-xl: clamp(96px, 12vw, 190px);
  --maxw:     1480px;
  --header-h: 84px;

  /* Tutto lento e morbido, niente di elastico */
  --ease-out:  cubic-bezier(.16, 1, .3, 1);
  --ease-slow: cubic-bezier(.22, .61, .36, 1);
  --ease-inout: cubic-bezier(.65, 0, .35, 1);

  /* ---------- Regia dello scroll ---------- */
  /* Quanto scroll dura il flyby e quanto la transizione verso "Come inizia".
     main.js legge questi due valori: basta cambiarli qui. */
  --flight-length: 400vh;
  --cut-length: 170vh;

  /* Fotografia di "Come inizia": punto orizzontale inquadrato (0–100) quando è a
     tutto schermo e quando è nella cornice, così la mongolfiera resta al centro */
  --photo-x-wide: 30;
  --photo-x-framed: 4;

  /* Fotografia del panorama: proporzioni e punto che resta inquadrato (0–1).
     Letti anche da scene.js per inquadrare la scena 3D allo stesso modo */
  --world-ratio: 2752 / 1536;
  --focus-x: 0.5;
  --focus-y: 0.45;

  /* Mongolfiera del fallback statico, in % della fotografia */
  --balloon-x: 61%;
  --balloon-y: 43%;
  --balloon-h: 12%;

  /* Bordo ispirato ai tessuti lao: piccole losanghe con un punto, unite da un filo */
  --motif: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='10' viewBox='0 0 24 10'%3E%3Cpath d='M6 1 L11 5 L6 9 L1 5 Z' fill='none' stroke='%238F2F24' stroke-width='.8'/%3E%3Ccircle cx='6' cy='5' r='1' fill='%238F2F24'/%3E%3Cpath d='M11 5 H24' stroke='%238F2F24' stroke-width='.5'/%3E%3C/svg%3E");
  /* Grana della carta */
  --grain: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='220' height='220'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 .14 0 0 0 0 .13 0 0 0 0 .11 0 0 0 .55 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--ink);
  color: var(--ink);
  font-family: var(--sans);
  font-size: var(--fs-body);
  font-weight: 400;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

/* La grana sta sopra a tutto, scena 3D compresa: tiene insieme pellicola e carta */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 200;
  pointer-events: none;
  background-image: var(--grain);
  opacity: .13;
  mix-blend-mode: multiply;
}

img, svg { display: block; max-width: 100%; }
h1, h2, p, ul, figure { margin: 0; }
ul { padding: 0; list-style: none; }
a { color: inherit; text-decoration: none; }
::selection { background: var(--saffron); color: var(--ink); }

.container {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.skip {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 300;
  padding: 10px 14px;
  background: var(--cream);
  color: var(--ink);
  font-size: 13px;
  transform: translateY(-200%);
}

.skip:focus { transform: none; }

.motif {
  display: block;
  height: 10px;
  width: 100%;
  background-image: var(--motif);
  background-size: 24px 10px;
  background-position: left center;
  background-repeat: round no-repeat;
  opacity: .75;
}

/* ---------- Header ---------- */

.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-h);
  padding-inline: var(--gutter);
  color: var(--cream);
  transition: color .8s var(--ease-slow);
}

/* Sopra la carta: inchiostro al posto del crema */
.site-header.is-paper {
  color: var(--ink);
}

.site-header.is-solid {
  background-color: rgba(241, 231, 210, .94);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--display);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: .14em;
  line-height: 1.2;
  text-transform: uppercase;
  white-space: nowrap;
}

.logo__mark {
  flex: none;
  width: 17px;
  height: 23px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.logo__mark .logo__basket { fill: var(--saffron); stroke: none; }
.logo__text { display: grid; }
.logo__text > span:last-child { font-weight: 400; opacity: .8; }

.nav__list {
  display: flex;
  align-items: baseline;
  gap: clamp(18px, 2.2vw, 34px);
}

.nav__list a {
  font-size: 13px;
  letter-spacing: .01em;
  padding-block: 6px;
  opacity: .82;
  transition: opacity .5s var(--ease-slow), color .8s var(--ease-slow);
}

.nav__list a:hover,
.nav__list a:focus-visible { opacity: 1; }

.nav__list .nav__book { color: var(--saffron); opacity: 1; }
.is-paper .nav__list .nav__book { color: var(--lacquer); }

/* ---------- Viaggio: palco condiviso ---------- */

.stage {
  position: relative;
}

/* Con la scena attiva il palco resta fermo e lo scroll diventa la regia */
.journey.is-3d {
  /* lvh: l'altezza massima del viewport, così la durata dello scroll non cambia
     quando le barre del browser mobile compaiono o si ritirano */
  height: calc(var(--flight-length) + var(--cut-length) + 100vh);
  height: calc(var(--flight-length) + var(--cut-length) + 100lvh);
}

.journey.is-3d .stage {
  position: sticky;
  top: 0;
  /* dvh: tutta l'area visibile in ogni momento. Con svh, su smartphone, quando la
     barra degli indirizzi si ritira il palco restava più corto dello schermo e
     sotto compariva lo sfondo scuro della pagina */
  height: 100vh;
  height: 100dvh;
  overflow: hidden;
  background: var(--ink);
}

/* ---------- Hero ---------- */

.hero {
  position: relative;
  height: 100vh;
  height: 100svh;
  min-height: 560px;
  overflow: hidden;
  color: var(--cream);
  background: var(--ink);
}

.journey.is-3d .hero {
  position: absolute;
  inset: 0;
  height: auto;
  min-height: 0;
}

/* Fallback: la fotografia copre sempre lo schermo mantenendo le proporzioni */
.world {
  --world-w: max(100vw, 100vh * var(--world-ratio));
  --world-w: max(100vw, 100svh * var(--world-ratio));
  position: absolute;
  width: var(--world-w);
  aspect-ratio: var(--world-ratio);
  left: calc((100% - var(--world-w)) * var(--focus-x));
  top: calc((100% - var(--world-w) / (var(--world-ratio))) * var(--focus-y));
}

.world__photo {
  width: 100%;
  height: 100%;
}

.world__balloon {
  position: absolute;
  left: var(--balloon-x);
  top: var(--balloon-y);
  height: var(--balloon-h);
  width: auto;
  max-width: none;
  translate: -50% -50%;
  /* velatura atmosferica: la mongolfiera è lontana */
  filter: saturate(0.86) contrast(0.9) brightness(1.03);
}

/* Il canvas è opaco: quando compare copre il fallback */
.gl {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  transition: opacity 1.2s ease;
  pointer-events: none;
}

.journey.is-3d .gl {
  opacity: 1;
}

/* Ombra morbida dietro al titolo: sfuma insieme a lui quando parte il flyby */
.hero__shade {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(ellipse 55% 45% at 18% 28%, rgba(24, 21, 18, .42) 0%, rgba(24, 21, 18, 0) 100%),
    linear-gradient(180deg, rgba(24, 21, 18, .5) 0%, rgba(24, 21, 18, .12) 30%, rgba(24, 21, 18, 0) 50%),
    linear-gradient(0deg, rgba(24, 21, 18, .55) 0%, rgba(24, 21, 18, 0) 34%);
}

.hero__content {
  position: absolute;
  top: clamp(100px, 14vh, 170px);
  bottom: clamp(28px, 6vh, 64px);
  left: var(--gutter);
  right: var(--gutter);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  pointer-events: none;
}

.hero__title {
  --hero-size: clamp(2rem, 3.8vw, 4.3rem);
  font-family: var(--title);
  font-weight: 400;
  font-size: var(--hero-size);
  line-height: 1.04;
  letter-spacing: -.03em;
  color: var(--cream);
}

.hero__line {
  display: block;
  animation: title-in 1.8s var(--ease-out) .25s both;
}

.hero__line--second {
  padding-left: .9em;
  font-size: 1.1em;
  color: var(--saffron);
  animation-delay: .42s;
}

.hero__sub {
  max-width: 27ch;
  margin-top: auto;
  font-size: 13.5px;
  font-weight: 300;
  line-height: 1.6;
  color: var(--cream-80);
  animation: title-in 1.8s var(--ease-out) .8s both;
}

.hero__coords {
  position: absolute;
  right: var(--gutter);
  bottom: clamp(28px, 6vh, 64px);
  text-align: right;
  font-size: 10px;
  letter-spacing: .06em;
  line-height: 1.7;
  font-variant-numeric: tabular-nums;
  color: rgba(241, 231, 210, .55);
}

@keyframes title-in {
  from { opacity: 0; transform: translateY(18px); }
  to   { opacity: 1; transform: none; }
}

/* "Salta il volo" in basso sul panorama: solo su schermi stretti, dove
   nell'header non c'è posto (vedi le regole per schermi stretti più sotto) */
.hero__skip {
  display: none;
}

/* ---------- Caricamento e invito a scorrere ---------- */

.loader {
  position: absolute;
  left: 50%;
  bottom: clamp(28px, 6vh, 64px);
  translate: -50% 0;
  font-size: 10px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: rgba(241, 231, 210, .7);
  transition: opacity .6s ease;
}

.journey.is-3d .loader {
  opacity: 0;
}

.scroll-hint {
  position: absolute;
  left: 50%;
  bottom: 0;
  padding-bottom: 28px;
  translate: -50% 0;
  display: none;
}

/* C'è qualcosa da scorrere solo con la scena attiva */
.journey.is-3d .scroll-hint {
  display: block;
}

.scroll-hint i {
  position: relative;
  display: block;
  width: 1px;
  height: 56px;
  overflow: hidden;
  background: rgba(241, 231, 210, .16);
}

.scroll-hint i::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--cream-80);
  animation: scroll-line 3.6s var(--ease-inout) infinite;
}

@keyframes scroll-line {
  0%   { transform: translateY(-100%); }
  60%  { transform: translateY(0); }
  100% { transform: translateY(100%); }
}

/* ---------- Come inizia ---------- */

/* Senza scena 3D: una normale sezione su carta, fotografia a sinistra e testo a destra */
.opening {
  position: relative;
  padding-block: var(--space-xl);
  background: var(--cream);
  color: var(--ink);
}

.opening__paper {
  display: none;
}

.opening__grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  column-gap: 24px;
  align-items: center;
}

.opening__frame {
  position: relative;
  grid-column: 1 / 6;
  aspect-ratio: 4 / 5.3;
  background: var(--jade);
}

.opening__figure {
  position: absolute;
  inset: 0;
  overflow: hidden;
}

.opening__figure img {
  width: 100%;
  height: 100%;
  max-width: none;
  object-fit: cover;
  /* fotografia orizzontale in cornice verticale: tiene la mongolfiera al centro */
  object-position: 0% 50%;
}

.opening__text {
  grid-column: 7 / 13;
}

.opening__text .motif {
  margin-bottom: var(--space-m);
}

.opening__title {
  overflow: hidden;
  font-family: var(--title);
  font-weight: 400;
  font-size: clamp(2.6rem, 5.8vw, 6.2rem);
  line-height: 1.08;
  letter-spacing: -.03em;
}

.opening__title span {
  display: block;
}

.opening__lead {
  margin-top: var(--space-s);
  max-width: 19ch;
  font-family: var(--serif);
  font-style: italic;
  font-size: clamp(1.6rem, 2.7vw, 2.5rem);
  line-height: 1.12;
  color: var(--lacquer);
}

.opening__body {
  display: grid;
  gap: 1em;
  max-width: 46ch;
  margin-top: var(--space-s);
  font-size: clamp(16px, 1.2vw, 18px);
  line-height: 1.6;
}

/* Con la scena attiva la sezione è l'ultima inquadratura del palco: la fotografia
   entra nella scia della mongolfiera (--wake), riempie il palco e poi si ridimensiona
   fino a .opening__frame (--fit va da 0 a 1). Questi valori li anima main.js */
.journey.is-3d .opening {
  position: absolute;
  inset: 0;
  padding: 0;
  background: none;
  pointer-events: none;
}

.journey.is-3d .opening__paper {
  display: block;
  position: absolute;
  inset: 0;
  background: var(--cream);
  visibility: hidden;
}

.journey.is-3d .opening__grid {
  height: 100%;
  padding-top: calc(var(--header-h) * .6);
}

.journey.is-3d .opening__frame {
  position: static;
  max-height: 72vh;
  max-height: 72svh;
  background: none;
}

.journey.is-3d .opening__figure {
  /* --fit: 0 = a tutto schermo, 1 = dentro la cornice. Posizione e misure della
     cornice (--frame-*) le scrive main.js e le aggiorna a ogni ridimensionamento */
  --fit: 0;
  --frame-t: 0px;
  --frame-l: 0px;
  --frame-w: 100%;
  --frame-h: 100%;
  /* bordo sfumato della scia, in frazioni della larghezza: la fotografia è piena
     a sinistra di (--wake - --feather) e trasparente a destra di --wake */
  --wake: 0;
  --feather: .3;
  --photo-x: var(--photo-x-wide);
  inset: auto;
  top: calc(var(--fit) * var(--frame-t));
  left: calc(var(--fit) * var(--frame-l));
  width: calc(100% + var(--fit) * (var(--frame-w) - 100%));
  height: calc(100% + var(--fit) * (var(--frame-h) - 100%));
  -webkit-mask-image: linear-gradient(90deg, #000 calc((var(--wake) - var(--feather)) * 100%), transparent calc(var(--wake) * 100%));
  mask-image: linear-gradient(90deg, #000 calc((var(--wake) - var(--feather)) * 100%), transparent calc(var(--wake) * 100%));
  visibility: hidden;
}

/* Quando copre tutto lo schermo la maschera non serve più */
.journey.is-3d .opening__figure.is-covering {
  -webkit-mask-image: none;
  mask-image: none;
}

.journey.is-3d .opening__figure img {
  /* quale parte della fotografia resta inquadrata mentre cambia proporzioni */
  object-position: calc(var(--photo-x) * 1%) 50%;
}

.journey.is-3d .opening__text {
  position: relative;
}

/* Solo a volo concluso il testo riceve tocchi e selezione: prima è invisibile
   e non deve coprire ciò che sta in basso nella hero */
.journey.is-3d.is-landed .opening__text {
  pointer-events: auto;
}

/* ---------- Schermi stretti ---------- */

@media (max-width: 900px) {
  :root {
    --header-h: 68px;
    /* su mobile il volo dura meno scroll */
    --flight-length: 320vh;
    --cut-length: 150vh;
    --photo-x-wide: 12;
    --photo-x-framed: 12;
  }

  .hero__content { top: clamp(104px, 17svh, 150px); bottom: 96px; }
  .hero__title { --hero-size: clamp(1.8rem, 8vw, 3rem); }
  .hero__line--second { padding-left: .6em; }
  .hero__coords { left: var(--gutter); right: auto; text-align: left; bottom: 52px; }
  .hero__coords br { display: none; }
  .scroll-hint { display: none !important; }
  .loader { bottom: 24px; }

  /* Allineato alle coordinate, sul lato opposto: resta durante tutto il flyby */
  .journey.is-3d .hero__skip {
    position: absolute;
    right: calc(var(--gutter) - 10px);
    bottom: 38px;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 10px;
    font-size: 10.5px;
    font-weight: 500;
    letter-spacing: .2em;
    text-transform: uppercase;
    color: var(--cream);
    text-shadow: 0 1px 14px rgba(24, 21, 18, .7);
  }

  .journey.is-3d .hero__skip::after {
    content: "";
    width: 18px;
    height: 1px;
    background: currentColor;
  }

  .opening__grid { grid-template-columns: 1fr; row-gap: var(--space-m); }
  .opening__frame,
  .opening__text { grid-column: 1; }
  .opening__frame { aspect-ratio: 4 / 4.2; }
  .opening__figure img { object-position: 12% 50%; }
  .opening__text .motif { margin-bottom: var(--space-s); }
  .opening__title { font-size: clamp(2.3rem, 11vw, 3.4rem); }
  .opening__lead { margin-top: 10px; font-size: 1.5rem; }
  .opening__body { margin-top: 14px; font-size: 15px; line-height: 1.55; }

  /* Palco: fotografia in alto, testo sotto, tutto in una schermata */
  .journey.is-3d .opening__grid {
    align-content: start;
    row-gap: 22px;
    padding-top: var(--header-h);
  }

  .journey.is-3d .opening__frame {
    aspect-ratio: auto;
    height: 38vh;
    height: 38svh;
    max-height: none;
  }
}

@media (max-aspect-ratio: 4 / 5) {
  :root {
    --focus-x: 0.47;
    --balloon-x: 54%;
    --balloon-h: 10%;
  }
}

/* ---------- Movimento ridotto ---------- */

/* La scena 3D non parte (vedi main.js): resta la pagina statica, senza animazioni d'ingresso */
@media (prefers-reduced-motion: reduce) {
  .hero__line,
  .hero__sub { animation: none; }
  .scroll-hint i::after { animation: none; }
}

.opening__title:focus { outline: none; }