:root{
  --ivory:#efe7d5;
  --base-r:7;
  --base-g:42;
  --base-b:45;
  --accent-r:155;
  --accent-g:122;
  --accent-b:69;
}

*{box-sizing:border-box}

html,
body{
  margin:0;
  min-height:100%;
  font-family:Georgia,"Times New Roman",serif;
  color:var(--ivory);
  background:#f7f4f1;
  -webkit-font-smoothing:antialiased;
}

body{
  overflow:hidden;
  background:
    radial-gradient(ellipse at 16% 14%,rgba(146,139,121,.18),transparent 31%),
    radial-gradient(ellipse at 84% 88%,rgba(121,106,86,.14),transparent 34%),
    linear-gradient(180deg,#f8f5f1 0%,#eee9e2 100%);
}

a{
  color:rgba(239,231,213,.86);
  text-decoration:none;
  border-bottom:1px solid rgba(var(--accent-r),var(--accent-g),var(--accent-b),.52);
}

a:hover{
  color:#fff;
  border-color:rgba(239,231,213,.82);
}

.chromatic-field{
  position:fixed;
  inset:-24%;
  z-index:0;
  pointer-events:none;
  background:
    radial-gradient(circle at 14% 28%,rgba(var(--base-r),var(--base-g),var(--base-b),.42),transparent 32%),
    radial-gradient(circle at 48% 48%,rgba(var(--accent-r),var(--accent-g),var(--accent-b),.30),transparent 36%),
    radial-gradient(circle at 83% 36%,rgba(88,92,140,.24),transparent 32%);
  filter:blur(62px) saturate(116%);
  opacity:.44;
}

.grain{
  position:fixed;
  inset:0;
  z-index:4;
  pointer-events:none;
  opacity:.07;
  mix-blend-mode:multiply;
  background-image:repeating-radial-gradient(circle at 12% 18%,rgba(0,0,0,.08) 0 1px,transparent 1px 3px);
}

.topline{
  position:fixed;
  top:24px;
  left:7vw;
  right:7vw;
  z-index:12;
  display:flex;
  justify-content:space-between;
  gap:1rem;
  font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  font-size:.72rem;
  letter-spacing:.18em;
  text-transform:uppercase;
}

.topline-actions{
  display:flex;
  align-items:center;
  justify-content:flex-end;
  gap:1.15rem;
}

.topline a{
  color:rgba(32,38,35,.78);
  border-bottom-color:rgba(32,38,35,.28);
  text-shadow:0 1px 16px rgba(255,255,255,.42);
  white-space:nowrap;
}

.topline a:hover{
  color:rgba(10,18,18,.92);
  border-bottom-color:rgba(var(--accent-r),var(--accent-g),var(--accent-b),.72);
}

.course-viewport{
  position:relative;
  z-index:1;
  width:100vw;
  height:100vh;
  overflow:hidden;
}

.course-track{
  height:100vh;
  display:flex;
  align-items:center;
  transition:transform 900ms cubic-bezier(.19,1,.22,1);
  will-change:transform;
}

.course-panel{
  position:relative;
  min-width:94vw;
  height:76vh;
  margin:12vh 3vw;
  padding:6.4vh 6.5vw;
  display:grid;
  grid-template-columns:minmax(0,680px) minmax(260px,440px);
  gap:7vw;
  align-items:center;
  overflow:hidden;
  isolation:isolate;
  border-radius:32px;
  background:
    radial-gradient(circle at 18% 18%,rgba(239,231,213,.18),transparent 30%),
    radial-gradient(circle at 76% 42%,rgba(var(--accent-r),var(--accent-g),var(--accent-b),.24),transparent 35%),
    linear-gradient(115deg,rgba(var(--base-r),var(--base-g),var(--base-b),.94),rgba(calc(var(--base-r) + 16),calc(var(--base-g) + 10),calc(var(--base-b) + 18),.93) 56%,rgba(61,49,62,.90));
  box-shadow:
    0 58px 72px -42px rgba(0,0,0,.48),
    0 28px 30px -26px rgba(0,0,0,.34);
}

.course-panel:nth-child(3n+1){
  --base-r:7;
  --base-g:42;
  --base-b:45;
  --accent-r:155;
  --accent-g:122;
  --accent-b:69;
}

.course-panel:nth-child(3n+2){
  --base-r:14;
  --base-g:50;
  --base-b:58;
  --accent-r:131;
  --accent-g:138;
  --accent-b:112;
}

.course-panel:nth-child(3n){
  --base-r:22;
  --base-g:33;
  --base-b:52;
  --accent-r:177;
  --accent-g:141;
  --accent-b:84;
}

.course-panel:after{
  content:"";
  position:absolute;
  inset:0;
  z-index:0;
  pointer-events:none;
  opacity:.32;
  background:
    radial-gradient(circle at 70% 34%,rgba(239,231,213,.07),transparent 27%),
    linear-gradient(90deg,rgba(255,255,255,.022),rgba(var(--accent-r),var(--accent-g),var(--accent-b),.03) 52%,rgba(239,231,213,.014));
}

.lesson-panel{
  grid-template-columns:minmax(0,720px) minmax(220px,1fr);
  background-size:cover;
  background-position:center;
  background-repeat:no-repeat;
}

.lesson-panel:before{
  content:"";
  position:absolute;
  inset:0;
  z-index:0;
  pointer-events:none;
  background:
    radial-gradient(circle at 72% 38%,rgba(239,231,213,.18),transparent 34%),
    linear-gradient(90deg,rgba(5,11,12,.76) 0%,rgba(7,18,20,.58) 33%,rgba(7,18,20,.20) 64%,rgba(5,11,12,.28) 100%),
    linear-gradient(180deg,rgba(0,0,0,.22),transparent 42%,rgba(0,0,0,.30));
  backdrop-filter:blur(.4px);
}

.lesson-panel:after{
  opacity:.72;
  background:
    radial-gradient(ellipse at 20% 42%,rgba(239,231,213,.09),transparent 38%),
    radial-gradient(ellipse at 78% 24%,rgba(var(--accent-r),var(--accent-g),var(--accent-b),.22),transparent 36%),
    radial-gradient(ellipse at 50% 100%,rgba(0,0,0,.34),transparent 48%);
  mix-blend-mode:screen;
}

.lesson-one{
  --base-r:92;
  --base-g:57;
  --base-b:30;
  --accent-r:225;
  --accent-g:166;
  --accent-b:82;
  background-image:url("../img_Master/Lezione1.png");
}

.lesson-two{
  --base-r:21;
  --base-g:18;
  --base-b:15;
  --accent-r:202;
  --accent-g:139;
  --accent-b:76;
  background-image:url("../img_Master/Lezione2.png");
}

.lesson-three{
  --base-r:12;
  --base-g:28;
  --base-b:64;
  --accent-r:108;
  --accent-g:154;
  --accent-b:224;
  background-image:url("../img_Master/Lezione%203.png");
}

.lesson-panel .section-copy{
  max-width:680px;
  padding:2rem 2.2rem;
  border:1px solid rgba(239,231,213,.13);
  border-radius:24px;
  background:
    linear-gradient(135deg,rgba(8,18,19,.58),rgba(8,18,19,.34)),
    rgba(239,231,213,.035);
  box-shadow:
    0 36px 86px rgba(0,0,0,.28),
    inset 0 0 34px rgba(239,231,213,.035);
  backdrop-filter:blur(10px) saturate(118%);
}

.lesson-one .section-copy{
  background:
    linear-gradient(135deg,rgba(56,31,14,.56),rgba(70,44,22,.28)),
    rgba(239,231,213,.045);
}

.lesson-two .section-copy{
  background:
    linear-gradient(135deg,rgba(12,11,10,.66),rgba(31,22,14,.35)),
    rgba(239,231,213,.035);
}

.lesson-three .section-copy{
  background:
    linear-gradient(135deg,rgba(5,16,38,.62),rgba(10,34,64,.34)),
    rgba(239,231,213,.035);
}

.panel-frame{
  position:absolute;
  inset:2.6vh 2.6vw;
  z-index:1;
  border:1px solid rgba(239,231,213,.15);
  border-radius:24px;
  pointer-events:none;
  box-shadow:inset 0 0 44px rgba(239,231,213,.04);
}

.panel-frame:before{
  content:"";
  position:absolute;
  inset:9px;
  border:1px solid rgba(var(--accent-r),var(--accent-g),var(--accent-b),.19);
  border-radius:17px;
}

.section-copy,
.course-visual,
.technical-note,
.contact-panel{
  position:relative;
  z-index:3;
}

.section-copy{
  max-height:calc(76vh - 12vh);
  overflow:hidden;
  display:flex;
  flex-direction:column;
}

.eyebrow{
  margin:0 0 1rem;
  font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  text-transform:uppercase;
  letter-spacing:.28em;
  font-size:.72rem;
  color:rgba(239,231,213,.62);
}

h1,
h2,
h3{
  margin:0;
  font-weight:400;
  letter-spacing:-.045em;
  text-wrap:balance;
}

h1{
  max-width:900px;
  font-size:clamp(3.35rem,5.8vw,6.35rem);
  line-height:.94;
}

h2{
  max-width:720px;
  font-size:clamp(2.75rem,4.8vw,5.2rem);
  line-height:.94;
}

h3{
  margin:0 0 1rem;
  font-size:clamp(1.28rem,1.7vw,1.85rem);
  line-height:1.15;
  color:rgba(239,231,213,.78);
}

p{
  max-width:690px;
  margin:1.2rem 0 0;
  font-size:clamp(1.02rem,1.13vw,1.18rem);
  line-height:1.68;
  color:rgba(239,231,213,.80);
}

.lead{
  font-size:clamp(1.12rem,1.35vw,1.42rem);
  color:rgba(239,231,213,.86);
}

.text-scroll{
  flex:1 1 auto;
  min-height:0;
  max-height:none;
  overflow-y:auto;
  overflow-x:hidden;
  padding-right:14px;
  scrollbar-width:none;
  -ms-overflow-style:none;
  overscroll-behavior:contain;
}

.text-scroll::-webkit-scrollbar{
  width:0;
  height:0;
}

.text-scroll > *:first-child{
  margin-top:1.25rem;
}

.link-list{
  display:flex;
  flex-wrap:wrap;
  gap:.7rem 1.1rem;
  margin-top:1.7rem;
  font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  font-size:.76rem;
  letter-spacing:.16em;
  text-transform:uppercase;
}

.technical-note{
  align-self:center;
  max-width:410px;
  padding:2rem;
  border-left:1px solid rgba(var(--accent-r),var(--accent-g),var(--accent-b),.45);
  background:linear-gradient(130deg,rgba(239,231,213,.055),rgba(239,231,213,.018));
}

.technical-note.compact{
  max-width:360px;
}

.technical-note p{
  margin:0;
  font-size:1.12rem;
}

.course-visual{
  justify-self:center;
  width:min(30vw,430px);
  height:min(54vh,500px);
  border:1px solid rgba(239,231,213,.14);
  border-radius:22px;
  overflow:hidden;
  background:rgba(239,231,213,.035);
  box-shadow:
    0 42px 94px rgba(0,0,0,.34),
    0 14px 30px rgba(0,0,0,.22),
    inset 0 0 30px rgba(239,231,213,.035);
}

.course-visual.quiet{
  opacity:.88;
}

.course-visual.portrait{
  width:min(35vw,520px);
  aspect-ratio:3/2;
  height:auto;
}

.course-visual.support{
  width:min(31vw,460px);
  height:min(45vh,420px);
  transform:rotate(-1deg);
}

.course-visual.lesson{
  width:min(34vw,520px);
  height:min(43vh,390px);
  transform:rotate(-.45deg);
  background:rgba(239,231,213,.045);
}

.course-visual.emblem{
  width:min(22vw,310px);
  height:min(42vh,330px);
  padding:2.2rem;
  opacity:.42;
  background:rgba(239,231,213,.025);
}

.course-visual img{
  width:100%;
  height:100%;
  object-fit:cover;
  display:block;
  filter:saturate(.88) contrast(1.06) brightness(.94);
}

.course-visual.portrait img{
  object-position:center center;
  filter:saturate(1.02) contrast(1.06) brightness(1);
}

.settings-button{
  position:fixed;
  top:24px;
  left:24px;
  z-index:30;
  width:42px;
  height:42px;
  border-radius:50%;
  border:1px solid rgba(239,231,213,.24);
  background:rgba(7,31,37,.24);
  color:rgba(239,231,213,.76);
  cursor:pointer;
  backdrop-filter:blur(10px);
  display:grid;
  place-items:center;
  padding:0;
  line-height:1;
  appearance:none;
  -webkit-appearance:none;
}

.settings-button svg{
  width:18px;
  height:18px;
  stroke:currentColor;
  stroke-width:1.65;
  fill:none;
}

.settings-panel{
  position:fixed;
  top:78px;
  left:24px;
  z-index:29;
  width:min(330px,calc(100vw - 48px));
  padding:18px;
  border:1px solid rgba(42,48,45,.14);
  border-radius:22px;
  background:rgba(247,244,241,.74);
  color:rgba(33,39,36,.78);
  backdrop-filter:blur(18px);
  box-shadow:0 30px 80px rgba(0,0,0,.16);
  opacity:0;
  transform:translateY(-8px);
  pointer-events:none;
  transition:opacity .25s ease,transform .25s ease;
  font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
}

.settings-panel.open{
  opacity:1;
  transform:translateY(0);
  pointer-events:auto;
}

.settings-title{
  margin:0 0 6px;
  font-size:.82rem;
  letter-spacing:.18em;
  text-transform:uppercase;
}

.settings-note{
  margin:0 0 14px;
  font-size:.82rem;
  line-height:1.45;
  color:rgba(33,39,36,.56);
}

.palette-list{
  display:grid;
  gap:10px;
}

.palette-option{
  width:100%;
  border:1px solid rgba(42,48,45,.14);
  border-radius:16px;
  padding:10px;
  background:rgba(255,255,255,.28);
  color:rgba(33,39,36,.82);
  cursor:pointer;
  text-align:left;
  display:grid;
  grid-template-columns:54px 1fr;
  gap:10px;
  align-items:center;
}

.palette-option.active,
.palette-option:hover{
  background:rgba(255,255,255,.46);
  border-color:rgba(var(--accent-r),var(--accent-g),var(--accent-b),.62);
}

.swatch{
  height:34px;
  border-radius:999px;
  border:1px solid rgba(42,48,45,.18);
}

.palette-name{
  display:block;
  font-size:.9rem;
  line-height:1.15;
}

.palette-desc{
  display:block;
  margin-top:2px;
  font-size:.74rem;
  color:rgba(33,39,36,.50);
  line-height:1.25;
}

.course-visual.lesson img{
  object-fit:contain;
  padding:1.1rem;
  filter:saturate(.92) contrast(1.04) brightness(.96);
}

.course-visual.emblem img{
  object-fit:contain;
  filter:invert(1) sepia(.35) saturate(.5) brightness(1.08);
}

.detail-grid{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:1rem 1.35rem;
  margin-top:1.25rem;
}

.detail-grid p{
  margin:0;
  padding:1rem 0 0;
  border-top:1px solid rgba(239,231,213,.13);
  font-size:.98rem;
}

.contact-panel{
  align-self:center;
  max-height:calc(76vh - 12vh);
  overflow:hidden;
  padding:1.8rem;
  border:1px solid rgba(239,231,213,.14);
  border-radius:22px;
  background:rgba(7,18,20,.30);
  backdrop-filter:blur(12px);
}

.contact-panel h3{
  margin:0 0 1.2rem;
}

form{
  display:grid;
  gap:.72rem;
  font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
}

label{
  font-size:.68rem;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:rgba(239,231,213,.58);
}

input,
textarea{
  width:100%;
  border:1px solid rgba(239,231,213,.16);
  background:rgba(7,18,20,.34);
  color:rgba(239,231,213,.88);
  border-radius:13px;
  padding:.78rem .85rem;
  font:inherit;
  outline:none;
}

button{
  justify-self:start;
  border:1px solid rgba(var(--accent-r),var(--accent-g),var(--accent-b),.42);
  background:rgba(var(--accent-r),var(--accent-g),var(--accent-b),.12);
  color:rgba(239,231,213,.86);
  border-radius:999px;
  padding:.8rem 1.1rem;
  cursor:pointer;
  letter-spacing:.12em;
  text-transform:uppercase;
  font-size:.72rem;
}

.social-link{
  margin-top:1.2rem;
  font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  font-size:.84rem;
}

.ghost{
  position:absolute;
  right:4vw;
  bottom:4vh;
  z-index:2;
  font-family:system-ui,sans-serif;
  font-size:clamp(6rem,15vw,15rem);
  line-height:.8;
  letter-spacing:-.08em;
  font-weight:700;
  color:rgba(239,231,213,.045);
  pointer-events:none;
}

.arrows{
  position:fixed;
  left:28px;
  bottom:18px;
  z-index:12;
  display:flex;
  gap:12px;
}

.arrow{
  width:42px;
  height:42px;
  border-radius:50%;
  border:1px solid rgba(239,231,213,.24);
  background:rgba(7,31,37,.24);
  color:rgba(239,231,213,.76);
  cursor:pointer;
  backdrop-filter:blur(10px);
  display:grid;
  place-items:center;
  padding:0;
  line-height:1;
  appearance:none;
  -webkit-appearance:none;
}

.arrow svg{
  width:18px;
  height:18px;
  stroke:currentColor;
  stroke-width:1.65;
  fill:none;
}

.progress{
  position:fixed;
  left:50%;
  bottom:30px;
  transform:translateX(-50%);
  z-index:10;
  width:min(420px,58vw);
  height:2px;
  background:rgba(44,49,45,.16);
  border-radius:99px;
  overflow:hidden;
}

.progress span{
  display:block;
  width:0%;
  height:100%;
  background:linear-gradient(90deg,rgba(45,49,44,.52),rgba(155,122,69,.88));
  transition:width 700ms cubic-bezier(.19,1,.22,1);
}

.hint{
  position:fixed;
  right:28px;
  bottom:22px;
  z-index:10;
  margin:0;
  font-family:system-ui,sans-serif;
  font-size:.76rem;
  letter-spacing:.12em;
  text-transform:uppercase;
  color:rgba(42,48,45,.46);
}

@media(max-width:900px){
  html,
  body{
    overflow:auto;
    background:#071519;
  }

  body{
    background:
      radial-gradient(circle at 15% 12%,rgba(239,231,213,.16),transparent 24%),
      radial-gradient(circle at 78% 20%,rgba(var(--accent-r),var(--accent-g),var(--accent-b),.20),transparent 28%),
      linear-gradient(125deg,rgba(7,28,34,1),rgba(18,25,36,1) 52%,rgba(54,34,50,1));
  }

  .topline{
    position:relative;
    top:auto;
    left:auto;
    right:auto;
    padding:1.2rem 1.35rem 0;
    z-index:40;
    align-items:flex-start;
  }

  .topline-actions{
    flex-wrap:wrap;
    gap:.85rem;
    justify-content:flex-end;
  }

  .topline a{
    color:rgba(255,255,240,.94);
    border-bottom-color:rgba(255,255,240,.42);
    opacity:1;
    text-shadow:0 1px 18px rgba(0,0,0,.46);
  }

  .topline a:hover{
    color:rgba(255,255,255,.98);
    border-bottom-color:rgba(239,231,213,.78);
  }

  .course-viewport{
    height:auto;
    overflow:visible;
  }

  .course-track{
    height:auto;
    display:block;
    transform:none!important;
  }

  .course-panel{
    min-width:100%;
    height:auto;
    min-height:auto;
    margin:1.2rem;
    padding:4.8rem 1.35rem;
    display:block;
    border-radius:24px;
  }

  .panel-frame{
    inset:1.2rem;
    border-radius:22px;
  }

  h1{
    font-size:clamp(3rem,14vw,5rem);
  }

  h2{
    font-size:clamp(2.55rem,12vw,4.25rem);
  }

  p{
    font-size:1.04rem;
  }

  .section-copy,
  .contact-panel{
    max-height:none;
    overflow:visible;
  }

  .text-scroll{
    max-height:none;
    overflow:visible;
    padding-right:0;
  }

  .course-visual{
    width:100%;
    height:300px;
    margin:2rem 0 0;
    transform:none!important;
  }

  .lesson-panel{
    background-position:center top;
  }

  .lesson-panel:before{
    background:
      linear-gradient(180deg,rgba(5,11,12,.42),rgba(5,11,12,.76) 42%,rgba(5,11,12,.82)),
      radial-gradient(circle at 50% 12%,rgba(239,231,213,.14),transparent 42%);
  }

  .lesson-panel .section-copy{
    margin-top:44vh;
    padding:1.35rem;
    border-radius:20px;
    max-width:none;
  }

  .course-visual.portrait{
    width:min(72vw,360px);
    margin:2rem auto 0;
  }

  .course-visual.emblem{
    width:min(58vw,280px);
    height:260px;
    margin:2rem auto 0;
  }

  .technical-note,
  .contact-panel{
    margin-top:2rem;
    padding:1.3rem;
  }

  .detail-grid{
    grid-template-columns:1fr;
  }

  .ghost{
    font-size:7rem;
    right:1.6rem;
    bottom:1.6rem;
  }

  .arrows,
  .progress,
  .hint{
    display:none;
  }

  .settings-button{
    top:14px;
    left:14px;
  }

  .settings-panel{
    top:66px;
    left:14px;
    width:calc(100vw - 28px);
  }
}