/* Maison Rubinacci · La Sala */
/* Cuoio e Seta palette — Playfair Display solo-typeface system */

:root {
  --cuoio:       #F3EDE6;
  --cuoio-medio: #EBE5DC;
  --pergamena:   #3D3630;
  --terra:       #B88A7A;
  --argento:     #9E9488;
  --filo:        #D5CFC7;
  --serif:       'Playfair Display', Georgia, serif;
  --ease:        cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --ease-deep:   cubic-bezier(0.65, 0, 0.35, 1);
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--cuoio);
  color: var(--pergamena);
  font-family: var(--serif);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg width='4' height='4' viewBox='0 0 4 4' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M0 2h4M2 0v4' stroke='%233D3630' stroke-width='0.5' opacity='0.03'/%3E%3C/svg%3E");
  background-repeat: repeat;
  pointer-events: none;
  z-index: 1;
}

#loader {
  position: fixed;
  inset: 0;
  background: var(--cuoio);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  transition: opacity 0.8s var(--ease), visibility 0.8s;
  min-height: -webkit-fill-available;
}

#loader.is-hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.loader-frame {
  position: absolute;
  top: 2rem;
  left: 0;
  right: 0;
  display: flex;
  justify-content: space-between;
  padding: 0 2.4rem;
  font-size: 0.65rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--argento);
}

.loader-cipher {
  width: 160px;
  height: 48px;
}

.loader-cipher path {
  fill: none;
  stroke: var(--pergamena);
  stroke-width: 1.5;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-dasharray: 300;
  stroke-dashoffset: 300;
}

.loader-cipher.is-drawn path {
  stroke-dashoffset: 0;
  transition: stroke-dashoffset 1.8s var(--ease-deep);
}

.loader-rule {
  width: 0;
  height: 1px;
  background: var(--filo);
  margin: 1.5rem 0;
}

.loader-rule.is-drawn {
  width: 120px;
  transition: width 1.2s var(--ease-deep) 0.4s;
}

.loader-statement {
  font-size: 0.75rem;
  font-style: italic;
  color: var(--argento);
  letter-spacing: 0.05em;
  opacity: 0;
  transform: translateY(8px);
}

.loader-statement.is-visible {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
}

.p-frame {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 50;
}

.p-frame-tl, .p-frame-tr, .p-frame-bl, .p-frame-br {
  position: absolute;
  font-size: 0.65rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--argento);
  pointer-events: auto;
}

.p-frame-tl { top: 2rem; left: 2.4rem; }
.p-frame-tr { top: 2rem; right: 2.4rem; }
.p-frame-bl { bottom: 2rem; left: 2.4rem; }
.p-frame-br { bottom: 2rem; right: 2.4rem; cursor: pointer; transition: color 0.3s; }
.p-frame-br:hover { color: var(--pergamena); }

#cursor {
  position: fixed;
  top: 0; left: 0;
  width: 8px; height: 8px;
  background: var(--pergamena);
  border-radius: 50%;
  pointer-events: none;
  z-index: 9999;
  transform: translate(-50%, -50%);
  transition: width 0.3s var(--ease), height 0.3s var(--ease), background 0.3s var(--ease);
}

#cursor.is-hover {
  width: 40px; height: 40px;
  background: transparent;
  border: 1px solid var(--pergamena);
}

@media (hover: none) {
  #cursor { display: none; }
}

#index-panel {
  position: fixed;
  top: 0; right: 0;
  width: 380px;
  max-width: 90vw;
  height: 100vh;
  background: var(--cuoio-medio);
  z-index: 200;
  transform: translateX(100%);
  transition: transform 0.6s var(--ease-deep);
  padding: 6rem 3rem 3rem;
  display: flex;
  flex-direction: column;
}

#index-panel.is-open {
  transform: translateX(0);
}

.index-close {
  position: absolute;
  top: 2rem; right: 2.4rem;
  font-size: 0.65rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--argento);
  cursor: pointer;
  transition: color 0.3s;
}
.index-close:hover { color: var(--pergamena); }

.index-nav {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  margin-top: auto;
  margin-bottom: auto;
}

.index-nav a {
  display: flex;
  align-items: baseline;
  gap: 1.5rem;
  text-decoration: none;
  color: var(--argento);
  transition: color 0.4s var(--ease);
}
.index-nav a:hover { color: var(--pergamena); }

.index-num {
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--filo);
  min-width: 2rem;
}

.index-label {
  font-size: 1.5rem;
  font-style: italic;
}

#hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  position: relative;
  padding: 0 8vw;
}

.hero-inner {
  max-width: 900px;
}

.hero-title {
  font-size: clamp(72px, 16vw, 260px);
  font-weight: 400;
  line-height: 0.88;
  margin: 0;
  letter-spacing: -0.02em;
  opacity: 0;
  transform: translateY(24px);
}

.hero-title.is-visible {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 1.2s var(--ease), transform 1.2s var(--ease);
}

.hero-sub {
  font-size: 0.75rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--argento);
  margin-top: 2rem;
  opacity: 0;
}

.hero-sub.is-visible {
  opacity: 1;
  transition: opacity 1s var(--ease) 0.3s;
}

.hero-rule {
  width: 0;
  height: 1px;
  background: var(--filo);
  margin: 2rem 0;
}

.hero-rule.is-drawn {
  width: 80px;
  transition: width 1.2s var(--ease-deep) 0.6s;
}

.hero-line {
  font-size: 1.1rem;
  font-style: italic;
  color: var(--argento);
  max-width: 28em;
  line-height: 1.6;
  opacity: 0;
}

.hero-line.is-visible {
  opacity: 1;
  transition: opacity 1s var(--ease) 0.8s;
}

.scroll-cue {
  position: absolute;
  bottom: 3rem;
  left: 8vw;
  font-size: 0.6rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--filo);
  opacity: 0;
}

.scroll-cue.is-visible {
  opacity: 1;
  transition: opacity 1s var(--ease) 1.2s;
}

.chapter {
  position: relative;
  padding: 18vh 0;
  min-height: 80vh;
  display: flex;
  align-items: center;
}

.chapter-ghost {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: clamp(140px, 28vw, 440px);
  font-weight: 700;
  color: var(--pergamena);
  opacity: 0.02;
  pointer-events: none;
  user-select: none;
  line-height: 1;
}

.chapter-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6rem;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 6vw;
  align-items: center;
  width: 100%;
}

.chapter-grid-flip {
  direction: rtl;
}

.chapter-grid-flip > * {
  direction: ltr;
}

.chapter-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.visual-svg, .visual-svg-wide {
  width: 100%;
  max-width: 380px;
  height: auto;
  stroke: var(--argento);
  stroke-width: 1;
  fill: none;
  opacity: 0;
  transform: translateX(-20px);
  transition: opacity 1s var(--ease), transform 1s var(--ease);
}

.visual-svg-wide {
  max-width: 560px;
}

.chapter-text {
  max-width: 460px;
}

.chapter-ord {
  display: block;
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--argento);
  margin-bottom: 1rem;
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
}

.chapter-title {
  font-size: clamp(36px, 5vw, 64px);
  font-weight: 400;
  line-height: 1.1;
  margin: 0 0 0.5rem;
  font-style: italic;
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
}

.chapter-sub {
  font-size: 0.9rem;
  font-style: italic;
  color: var(--argento);
  margin: 0 0 1.5rem;
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
}

.chapter-rule {
  width: 0;
  height: 1px;
  background: var(--filo);
  margin: 1.5rem 0;
  transition: width 1s var(--ease-deep);
}

.chapter-body {
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--pergamena);
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
}

.chapter.is-visible .chapter-ord,
.chapter.is-visible .chapter-title,
.chapter.is-visible .chapter-sub,
.chapter.is-visible .chapter-body {
  opacity: 1;
  transform: translateY(0);
}

.chapter.is-visible .chapter-ord { transition-delay: 0.1s; }
.chapter.is-visible .chapter-title { transition-delay: 0.2s; }
.chapter.is-visible .chapter-sub { transition-delay: 0.3s; }
.chapter.is-visible .chapter-rule { width: 60px; transition-delay: 0.4s; }
.chapter.is-visible .chapter-body { transition-delay: 0.5s; }
.chapter.is-visible .visual-svg,
.chapter.is-visible .visual-svg-wide { opacity: 1; transform: translateX(0); transition-delay: 0.3s; }

.chapter-center {
  flex-direction: column;
  text-align: center;
  padding: 18vh 6vw;
}

.chapter-text-center {
  max-width: 640px;
  margin: 0 auto;
}

.chapter-rule-center {
  margin-left: auto;
  margin-right: auto;
}

.chapter-visual-center {
  margin-top: 4rem;
  display: flex;
  justify-content: center;
}

.chapter-correspondence {
  min-height: 70vh;
  text-align: center;
  padding: 18vh 6vw;
}

.correspondence-content {
  max-width: 600px;
  margin: 0 auto;
}

.correspondence-invite {
  font-size: clamp(28px, 4vw, 48px);
  font-style: italic;
  line-height: 1.3;
  margin: 2rem 0;
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
}

.correspondence-invite em {
  color: var(--terra);
  font-style: italic;
}

.correspondence-link {
  font-size: 1.1rem;
  color: var(--pergamena);
  text-decoration: none;
  border-bottom: 1px solid var(--filo);
  padding-bottom: 0.2rem;
  transition: border-color 0.3s, color 0.3s;
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.8s var(--ease), transform 0.8s var(--ease), border-color 0.3s, color 0.3s;
}

.correspondence-link:hover {
  border-color: var(--terra);
  color: var(--terra);
}

.chapter-correspondence.is-visible .correspondence-invite,
.chapter-correspondence.is-visible .correspondence-link {
  opacity: 1;
  transform: translateY(0);
}

.chapter-correspondence.is-visible .correspondence-invite { transition-delay: 0.3s; }
.chapter-correspondence.is-visible .correspondence-link { transition-delay: 0.5s; }

.colophon {
  padding: 10vh 6vw 6vh;
  border-top: 1px solid var(--filo);
  max-width: 1200px;
  margin: 0 auto;
}

.colophon-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  margin-bottom: 4rem;
}

.colophon-cell {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.colophon-num {
  font-size: 0.7rem;
  color: var(--filo);
  letter-spacing: 0.1em;
}

.colophon-label {
  font-size: 0.65rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--argento);
}

.colophon-value {
  font-size: 1.1rem;
  font-style: italic;
}

.colophon-line {
  text-align: center;
  font-size: 0.7rem;
  color: var(--argento);
  letter-spacing: 0.05em;
}

a:focus-visible, button:focus-visible, .p-frame-br:focus-visible, .index-close:focus-visible {
  outline: 1px solid var(--terra);
  outline-offset: 4px;
}

@media (max-width: 768px) {
  .chapter-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
    padding: 0 5vw;
  }
  #index-panel {
    width: 100vw;
    max-width: 100vw;
    padding: 5rem 2rem 2rem;
  }
  .loader-frame {
    padding: 0 1.5rem;
    font-size: 0.55rem;
  }
  .loader-cipher {
    width: 120px;
    height: 36px;
  }
  .chapter-grid-flip { direction: ltr; }
  .chapter-grid-flip > * { direction: ltr; }
  .visual-svg, .visual-svg-wide {
    max-width: 280px;
    margin: 0 auto;
  }
  .chapter {
    padding: 12vh 0;
    min-height: auto;
  }
  .chapter-center { padding: 12vh 5vw; }
  .chapter-correspondence { padding: 12vh 5vw; }
  .colophon-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .p-frame-tl, .p-frame-tr, .p-frame-bl, .p-frame-br {
    font-size: 0.55rem;
  }
  .p-frame-tl { top: 1.2rem; left: 1.2rem; }
  .p-frame-tr { top: 1.2rem; right: 1.2rem; }
  .p-frame-bl { bottom: 1.2rem; left: 1.2rem; }
  .p-frame-br { bottom: 1.2rem; right: 1.2rem; }
  .index-nav a { gap: 1rem; }
  .index-label { font-size: 1.2rem; }
  #hero { padding: 0 5vw; }
  .scroll-cue { left: 5vw; }
}

@media (max-width: 480px) {
  .hero-title { font-size: clamp(48px, 14vw, 120px); }
  .colophon-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  .correspondence-invite { font-size: clamp(22px, 6vw, 36px); }
}