/* Corso di fotografia interattivo — Enrico Marega
   Interfaccia grigio neutro, come un programma di sviluppo foto:
   nessuna dominante, così esposizione e colori si giudicano senza inganni.
   Il colore è un dato: arancione = diaframma, blu = tempo, verde = ISO,
   viola = obiettivo e messa a fuoco, giallo = luce. */

/* Il carattere Archivo è dichiarato in fonts.css */

:root {
  --bg: #262626;
  --bg-2: #2e2e2e;
  --bg-3: #363636;
  --bg-lcd: #1c1c1c;
  --line: #3f3f3f;
  --line-2: #4d4d4d;
  --text: #f2f2f2;
  --text-2: #d2d2d2;
  --muted: #a3a3a3;
  --grey18: #777777;
  --ap: #f99f55;
  --sh: #62bbf5;
  --iso: #6dd48d;
  --lens: #b897f0;
  --ev: #f2d76c;
  --warn: #ef6661;
  --ok: #6dd48d;
  --font: 'Archivo', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --gutter: 16px;
  --header: 56px;
  --vh-max: 56svh;
  color-scheme: dark;
}
@supports not (height: 1svh) { :root { --vh-max: 56vh; } }

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; scroll-padding-top: calc(var(--header) + 12px); }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text-2);
  font-family: var(--font);
  font-size: 1rem;
  line-height: 1.55;
  font-stretch: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}
img, svg, canvas { display: block; max-width: 100%; }
a { color: var(--text); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
p { margin: 0 0 1em; }
strong { color: var(--text); font-weight: 650; }
h1, h2, h3 { color: var(--text); margin: 0; text-wrap: balance; }
h1 {
  font-size: clamp(2.05rem, 1.25rem + 3.9vw, 3.75rem);
  font-stretch: 122%;
  font-weight: 760;
  line-height: 1.02;
  letter-spacing: -0.018em;
}
h2 {
  font-size: clamp(1.42rem, 1.1rem + 1.4vw, 2.05rem);
  font-stretch: 116%;
  font-weight: 720;
  line-height: 1.1;
  letter-spacing: -0.01em;
}
h3 { font-size: 1.12rem; font-weight: 660; line-height: 1.25; }
.lead { font-size: clamp(1.06rem, 1rem + 0.3vw, 1.2rem); line-height: 1.5; color: var(--text-2); max-width: 38em; }
.muted { color: var(--muted); }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }
.skip { position: absolute; left: 8px; top: -60px; z-index: 100; background: var(--text); color: #1b1b1b; padding: 10px 14px; border-radius: 8px; }
.skip:focus { top: 8px; }
:focus-visible { outline: 2px solid var(--text); outline-offset: 3px; border-radius: 4px; }

.wrap { width: 100%; max-width: 1180px; margin: 0 auto; padding: 0 var(--gutter); }
.wrap-text { max-width: 760px; }

/* colori dei parametri, usati nel testo */
.c-ap { color: var(--ap); } .c-sh { color: var(--sh); } .c-iso { color: var(--iso); }
.c-lens { color: var(--lens); } .c-ev { color: var(--ev); } .c-warn { color: var(--warn); } .c-ok { color: var(--ok); }

/* ---------------- intestazione ---------------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  height: var(--header);
  background: rgba(38, 38, 38, 0.94);
  border-bottom: 1px solid var(--line);
}
@supports ((-webkit-backdrop-filter: blur(1px)) or (backdrop-filter: blur(1px))) {
  .site-header { background: rgba(38, 38, 38, 0.82); -webkit-backdrop-filter: blur(12px); backdrop-filter: blur(12px); }
}
.site-header .wrap { height: 100%; display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.brand { display: flex; flex-direction: column; text-decoration: none; line-height: 1.05; min-width: 0; }
.brand-name { color: var(--text); font-weight: 720; font-stretch: 118%; font-size: 1rem; letter-spacing: -0.005em; white-space: nowrap; }
.brand-sub { color: var(--muted); font-size: 0.78rem; white-space: nowrap; }
.head-right { display: flex; align-items: center; gap: 6px; min-width: 0; }
.nav-link {
  display: inline-flex; align-items: center; min-height: 38px; padding: 0 13px; border-radius: 999px;
  border: 1px solid var(--line-2); color: var(--text); text-decoration: none;
  font-size: 0.9rem; font-weight: 640; white-space: nowrap;
}
.nav-link:hover { background: var(--bg-3); }
.nav-link[aria-current="page"] { background: var(--text); color: var(--bg); border-color: var(--text); }
.social { display: flex; gap: 4px; }
.icon-btn {
  width: 44px; height: 44px; display: inline-grid; place-items: center;
  color: var(--text); border-radius: 10px; text-decoration: none;
}
.icon-btn:hover { background: var(--bg-3); }
.icon-btn svg { width: 22px; height: 22px; }
/* cambio di lingua: le due bandiere tonde, quella della pagina attuale è evidenziata.
   Tutto il gruppo porta all'altra lingua, così sul telefono si tocca facilmente. */
.lang-switch {
  position: relative; display: inline-flex; align-items: center; gap: 2px; flex: none;
  padding: 3px; border: 1px solid var(--line-2); border-radius: 999px;
}
.lang {
  display: inline-flex; align-items: center; gap: 6px; min-height: 30px; padding: 0 9px 0 4px; border-radius: 999px;
  color: var(--muted); text-decoration: none; font-size: 0.78rem; font-weight: 660; letter-spacing: 0.04em; white-space: nowrap;
}
a.lang::after { content: ''; position: absolute; inset: -4px; border-radius: 999px; }
a.lang:hover, a.lang:focus-visible { background: var(--bg-3); color: var(--text); }
.lang.is-current { background: var(--text); color: var(--bg); }
.flag { width: 22px; height: 22px; border-radius: 50%; overflow: hidden; flex: none; box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.25); }
.flag svg { width: 100%; height: 100%; }
/* telefono: restano le due bandiere, senza sigla; la lingua attuale ha l'anello bianco */
@media (max-width: 520px) {
  .site-header .wrap { gap: 8px; }
  .head-right { gap: 2px; }
  .brand-sub { font-size: 0.72rem; }
  .nav-link { padding: 0 9px; font-size: 0.84rem; margin-right: 2px; }
  .social { gap: 0; }
  .icon-btn { width: 34px; }
  .icon-btn svg { width: 20px; height: 20px; }
  .lang-switch { gap: 4px; padding: 4px; margin: 0 2px; }
  .lang { padding: 0; min-height: 0; gap: 0; }
  .lang.is-current { background: transparent; }
  .lang.is-current .flag { box-shadow: 0 0 0 2px var(--bg), 0 0 0 3.5px var(--text); }
  a.lang:hover, a.lang:focus-visible { background: transparent; }
  .lang-code { display: none; }
}
/* sui telefoni più stretti l'icona di YouTube lascia il posto alle bandiere (YouTube resta nel piè di pagina e in ogni lezione) */
@media (max-width: 399px) { .icon-yt { display: none; } }
@media (max-width: 374px) {
  .brand-sub { font-size: 0.7rem; }
  .nav-link { padding: 0 8px; }
}
@media (max-width: 340px) {
  .brand-name { font-size: 0.92rem; }
  .brand-sub { font-size: 0.66rem; }
  .nav-link { padding: 0 9px; font-size: 0.8rem; }
  .icon-btn { width: 32px; }
  /* sui telefoni piccolissimi resta solo la bandiera dell'altra lingua */
  .lang.is-current { display: none; }
  .flag { width: 20px; height: 20px; }
}

/* ---------------- pulsanti ---------------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  min-height: 50px; padding: 0 22px; border-radius: 999px;
  font-family: inherit; font-size: 1rem; font-weight: 640; font-stretch: 106%;
  text-decoration: none; border: 1px solid transparent; cursor: pointer;
  transition: background-color .15s, border-color .15s, color .15s;
}
.btn svg { width: 20px; height: 20px; flex: none; }
.btn-primary { background: var(--text); color: #1a1a1a; }
.btn-primary:hover { background: #ffffff; }
.btn-line { background: transparent; color: var(--text); border-color: var(--line-2); }
.btn-line:hover { border-color: var(--text); }
.cta-row { display: flex; flex-wrap: wrap; gap: 10px; }

/* ---------------- HOME: hero ---------------- */
.hero { padding: 18px 0 40px; }
.hero-grid { display: grid; gap: 18px; grid-template-areas: "kicker" "title" "lab" "copy"; }
/* l'etichetta sopra il titolo: dice subito che cos'è il sito */
.hero-kicker {
  grid-area: kicker; justify-self: start; margin: 0 0 -6px; padding: 6px 13px; border: 1px solid var(--line-2); border-radius: 14px;
  background: var(--bg-2); color: var(--text); font-size: clamp(0.7rem, 0.62rem + 0.36vw, 0.86rem); font-weight: 700;
  letter-spacing: 0.08em; line-height: 1.35; text-transform: uppercase;
}
@media (max-width: 374px) { .hero-kicker { letter-spacing: 0.04em; padding: 5px 11px; } }
.hero-title { grid-area: title; display: flex; align-items: center; justify-content: space-between; gap: 14px; }
/* il titolo prende lo spazio che gli serve: se una parola lunga non ci sta (in inglese «photography»), è la fotocamera a rimpicciolirsi */
.hero-title h1 { max-width: 11em; flex: 1 1 0; min-width: min-content; }
.hero-camera { flex: 0 1 auto; min-width: 60px; width: clamp(96px, 27vw, 176px); height: auto; filter: drop-shadow(0 10px 16px rgba(0, 0, 0, 0.45)); }
@media (max-width: 350px) { .hero-title { gap: 8px; flex-wrap: wrap; } .hero-camera { width: 78px; } }
/* computer con la finestra stretta: la colonna del titolo è piccola, la fotocamera va sotto il titolo invece di coprirlo */
@media (min-width: 900px) and (max-width: 1179px) { .hero-title { flex-wrap: wrap; row-gap: 18px; } .hero-camera { width: 150px; } }
.hero-lab { grid-area: lab; }
.hero-copy { grid-area: copy; }
.hero-copy .lead { margin-bottom: 22px; }
.hero-note { margin-top: 16px; font-size: 0.9rem; color: var(--muted); }

@media (min-width: 900px) {
  .hero { padding: 48px 0 72px; }
  .hero-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.92fr);
    grid-template-areas: "kicker lab" "title lab" "copy lab";
    grid-template-rows: auto auto 1fr;
    column-gap: 56px; row-gap: 28px;
    align-items: start;
  }
  .hero-title { align-self: end; }
}

/* ---------------- legenda colori ---------------- */
.legend { display: flex; flex-wrap: wrap; gap: 8px 18px; margin: 0; padding: 0; list-style: none; font-size: 0.92rem; }
.legend li { display: flex; align-items: center; gap: 8px; }
.legend li span { color: var(--text-2); }
.legend i { width: 18px; height: 4px; border-radius: 2px; background: var(--c, currentColor); }
.legend .c-ap { --c: var(--ap); } .legend .c-sh { --c: var(--sh); } .legend .c-iso { --c: var(--iso); }
.legend .c-lens { --c: var(--lens); } .legend .c-ev { --c: var(--ev); }

/* ---------------- HOME: percorso ---------------- */
.course { padding: 56px 0 24px; border-top: 1px solid var(--line); }
.course-head { display: grid; gap: 14px; margin-bottom: 36px; }
.course-head p { margin: 0; max-width: 40em; }
.progress-line { display: flex; align-items: center; gap: 12px; font-size: 0.92rem; color: var(--muted); }
.progress-bar { position: relative; width: 140px; height: 4px; border-radius: 2px; background: var(--line-2); overflow: hidden; }
.progress-bar::after { content: ''; position: absolute; inset: 0 auto 0 0; width: var(--p, 0%); background: var(--ok); border-radius: 2px; }

.level { padding: 26px 0 30px; display: grid; gap: 14px; }
.level + .level { border-top: 1px solid var(--line); }
.course-head { padding-bottom: 6px; }
.level-head { display: flex; flex-wrap: wrap; align-items: baseline; gap: 4px 14px; }
.level-head h3 { font-size: 1.35rem; font-stretch: 116%; font-weight: 720; }
.level-head p { margin: 0; color: var(--muted); font-size: 0.95rem; }
.lessons { list-style: none; margin: 0; padding: 0; display: grid; gap: 0; }
.lesson-row {
  display: grid; grid-template-columns: 2.6rem 1fr auto; align-items: center; gap: 12px;
  padding: 14px 4px; min-height: 64px;
  text-decoration: none; color: inherit;
  border-bottom: 1px solid var(--line);
}
.lessons li:last-child .lesson-row { border-bottom: 0; }
.lesson-row:hover .lr-title { text-decoration: underline; text-underline-offset: 4px; }
.lr-n { font-stretch: 72%; font-weight: 650; font-size: 1.55rem; color: var(--muted); font-variant-numeric: tabular-nums; line-height: 1; }
.lr-body { display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.lr-title { color: var(--text); font-weight: 640; font-size: 1.04rem; line-height: 1.25; }
.lr-desc { color: var(--muted); font-size: 0.9rem; line-height: 1.35; }
.lr-done { width: 26px; height: 26px; border-radius: 50%; border: 1px solid var(--line-2); display: grid; place-items: center; color: transparent; }
.lr-done svg { width: 16px; height: 16px; }
.is-done .lr-done { background: var(--ok); border-color: var(--ok); color: #13301d; }
.is-done .lr-n { color: var(--ok); }
@media (min-width: 760px) {
  .level { grid-template-columns: 15rem 1fr; gap: 28px; }
  .level-head { flex-direction: column; gap: 6px; }
  .lessons { grid-template-columns: 1fr 1fr; column-gap: 28px; }
}

/* ---------------- HOME: chi sono ---------------- */
.about { padding: 64px 0; border-top: 1px solid var(--line); }
.about-grid { display: grid; gap: 26px; align-items: center; }
.about-photo { width: 100%; max-width: 360px; height: auto; aspect-ratio: 9 / 16; object-fit: cover; border-radius: 4px; }
@media (max-width: 759px) { .about-photo { max-width: 300px; } }
.about h2 { margin-bottom: 14px; }
.about p { max-width: 36em; }
.about .cta-row { margin-top: 22px; }
.dm-line { margin-top: 18px; font-size: 0.95rem; color: var(--muted); }
/* rimando alla pagina «Chi sono» in fondo alla home */
.author-strip { padding: 36px 0 44px; border-top: 1px solid var(--line); }
.author-row { display: grid; grid-template-columns: 64px minmax(0, 1fr); gap: 14px 18px; align-items: center; }
.author-row .follow-photo { width: 64px; height: 64px; border-radius: 50%; object-fit: cover; filter: grayscale(1); }
.author-text h2 { font-size: 1.2rem; margin-bottom: 4px; }
.author-text p { margin: 0; color: var(--text-2); max-width: 40em; }
.author-row .btn { grid-column: 1 / -1; justify-self: start; }
@media (min-width: 760px) {
  .author-row { grid-template-columns: 64px minmax(0, 1fr) auto; }
  .author-row .btn { grid-column: auto; }
}
/* pagina «Chi sono» */
.about-page { border-top: 0; padding-top: 22px; }
.about-page .crumbs { margin-bottom: 22px; }
.about-page h1 { margin-bottom: 16px; }
@media (max-width: 759px) {
  /* sul telefono il titolo viene prima della foto */
  .about-page .about-grid { gap: 0; }
  .about-page .about-grid > div { display: contents; }
  .about-page .about-grid h1 { order: -1; margin-bottom: 18px; }
  .about-page .about-photo { margin-bottom: 24px; }
}
.about-page .lead { max-width: 34em; }
.contact-title { font-size: 1.2rem; margin: 30px 0 12px; }
.contact-list { list-style: none; margin: 0 0 24px; padding: 0; display: grid; gap: 10px; max-width: 34em; }
.contact {
  display: flex; align-items: center; gap: 14px; padding: 12px 14px; border-radius: 14px;
  border: 1px solid var(--line); background: var(--bg-2); color: var(--text); text-decoration: none;
}
.contact:hover { border-color: var(--line-2); background: var(--bg-3); }
.contact-ico { flex: none; display: grid; place-items: center; width: 42px; height: 42px; border-radius: 50%; background: var(--bg-3); }
.contact-ico svg { width: 22px; height: 22px; }
.contact-k { display: block; font-weight: 660; }
.contact-v { display: block; font-size: 0.9rem; color: var(--muted); margin-top: 2px; }
@media (min-width: 760px) { .about-grid { grid-template-columns: minmax(0, 0.8fr) minmax(0, 1fr); gap: 56px; } }

/* ---------------- piè di pagina ---------------- */
.site-footer { border-top: 1px solid var(--line); padding: 32px 0 calc(40px + env(safe-area-inset-bottom)); font-size: 0.9rem; color: var(--muted); }
.footer-grid { display: grid; gap: 14px; }
.footer-grid p { margin: 0; }
.footer-grid > div:first-child { display: grid; gap: 8px; }
.footer-links { display: flex; flex-wrap: wrap; gap: 6px 18px; }
.footer-links a { color: var(--text-2); }
.version { font-variant-numeric: tabular-nums; }
@media (min-width: 760px) { .footer-grid { grid-template-columns: 1fr auto; align-items: end; } }

/* ---------------- LEZIONE ---------------- */
.lesson-head { padding-top: 22px; padding-bottom: 22px; }
.crumbs { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 10px; font-size: 0.9rem; color: var(--muted); margin-bottom: 14px; }
.crumbs a { color: var(--text-2); }
.lesson-head h1 { max-width: 14em; margin-bottom: 14px; }
.lesson-head .lead { margin: 0; }
@media (min-width: 900px) {
  .lesson-head { padding-top: 36px; padding-bottom: 26px; }
  .lesson-head h1 { font-size: clamp(2.3rem, 1.4rem + 2.2vw, 3.1rem); max-width: 18em; }
}

.lab-section { padding-top: 8px; padding-bottom: 34px; }
.lab-section + .lab-section { padding-top: 30px; }
.lab-section + .lab-section::before, .lesson-block::before { content: ''; position: absolute; top: 0; left: var(--gutter); right: var(--gutter); height: 1px; background: var(--line); }
.lab-section, .lesson-block { position: relative; }
.lab-title { font-size: clamp(1.3rem, 1.12rem + 0.7vw, 1.6rem); font-stretch: 114%; font-weight: 720; margin-bottom: 8px; }
/* numero del simulatore e richiamo dai paragrafi */
.lab-section { scroll-margin-top: calc(var(--header) + 10px); }
.sim-tag {
  display: flex; align-items: center; gap: 8px; margin: 0 0 8px; font-size: 0.74rem; font-weight: 700;
  letter-spacing: 0.09em; text-transform: uppercase; color: var(--text-2);
}
.sim-n {
  display: inline-grid; place-items: center; min-width: 1.55rem; height: 1.55rem; padding: 0 0.3em; border-radius: 999px;
  background: var(--text); color: var(--bg); font-size: 0.8rem; font-weight: 760; letter-spacing: 0; line-height: 1;
}
.sim-ref {
  display: inline-flex; align-items: center; gap: 4px; margin-right: 6px; padding: 2px 9px 2px 3px; border-radius: 999px;
  border: 1px solid var(--line-2); background: var(--bg-2); color: var(--text-2); text-decoration: none;
  font-size: 0.7rem; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; line-height: 1.4;
  vertical-align: 0.14em; white-space: nowrap;
}
.sim-ref .sim-n { min-width: 1.3rem; height: 1.3rem; font-size: 0.72rem; }
.sim-ref .sim-w { margin-left: 3px; }
.sim-ref:hover, .sim-ref:focus-visible { border-color: #8a8a8a; color: var(--text); }
/* simbolo della compensazione nel testo */
.ev-sym { display: inline-block; color: var(--ev); line-height: 1; vertical-align: -0.05em; }
.ev-sym .ev-ico { width: 1.15em; height: 1.15em; vertical-align: -0.2em; }
.lab-intro { color: var(--text-2); max-width: 40em; margin-bottom: 16px; }

.lab-grid { display: grid; gap: 14px; }
.lab-stage { position: sticky; top: var(--header); z-index: 5; background: var(--bg); padding: 8px 0 6px; margin: -8px 0 0; }
.lab-stage.no-stick { position: static; }
.viewer {
  position: relative; width: min(100%, calc(var(--vh-max) * var(--ar, 1.5))); margin: 0 auto;
  aspect-ratio: var(--ar, 1.5); background: #1a1a1a; border-radius: 4px; overflow: hidden;
  touch-action: pan-y;
}
.viewer-canvas { width: 100%; height: 100%; }
.viewer-hint {
  position: absolute; left: 50%; bottom: 12px; transform: translateX(-50%);
  background: rgba(20, 20, 20, 0.72); color: var(--text); font-size: 0.85rem; padding: 6px 12px; border-radius: 999px;
  pointer-events: none; white-space: nowrap; transition: opacity .3s;
}
.viewer-loading { position: absolute; inset: 0; display: grid; place-items: center; color: var(--muted); font-size: 0.9rem; }
.overlay-svg { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; }

.lab-panel { display: grid; gap: 16px; align-content: start; }
.lab-panel .row { display: flex; flex-wrap: wrap; gap: 10px 16px; align-items: center; }
.field { display: grid; gap: 7px; }
.field-name { font-size: 0.82rem; color: var(--muted); }
@media (min-width: 900px) {
  .lab-grid { grid-template-columns: minmax(0, 1.1fr) minmax(300px, 0.9fr); gap: 36px; align-items: start; }
  .lab-grid.is-wide { grid-template-columns: minmax(0, 1.35fr) minmax(300px, 0.85fr); }
  .lab-stage { top: calc(var(--header) + 16px); margin: 0; padding: 0; }
  :root { --vh-max: 70vh; }
}

.lab-grid.is-stack { grid-template-columns: 1fr !important; gap: 14px; }
.hero-lab .viewer { --vh-max: 58svh; }
@media (min-width: 900px) {
  .hero-lab .viewer { width: min(100%, calc(66vh * var(--ar))); }
  .hero-lab .readout { width: min(100%, calc(66vh * var(--ar))); margin-left: auto; margin-right: auto; }
  .hero-lab .lab-panel { width: min(100%, calc(66vh * var(--ar))); margin: 0 auto; }
  .lab-grid.is-stack .lab-stage { position: static; }
}

/* striscia dati del mirino */
.readout {
  display: flex; flex-wrap: wrap; align-items: center; gap: 4px 16px;
  margin: 8px auto 0; padding: 8px 12px; border-radius: 6px;
  width: min(100%, calc(var(--vh-max) * var(--ar, 1.5)));
  background: var(--bg-lcd);
  font-stretch: 76%; font-weight: 620; font-size: 1.02rem; font-variant-numeric: tabular-nums;
  color: var(--text-2); min-height: 38px;
}
.ro--ap { color: var(--ap); } .ro--sh { color: var(--sh); } .ro--iso { color: var(--iso); }
.ro--lens { color: var(--lens); } .ro--ev { color: var(--ev); } .ro--neutral { color: var(--text-2); }
.ro--grow { margin-left: auto; font-stretch: 90%; font-weight: 520; font-size: 0.86rem; color: var(--muted); }
.ro.is-warn { color: var(--warn); }
.ro:empty { display: none; }

/* GHIERA */
.dial { --c: var(--text); }
.dial--ap { --c: var(--ap); } .dial--sh { --c: var(--sh); } .dial--iso { --c: var(--iso); }
.dial--lens { --c: var(--lens); } .dial--ev { --c: var(--ev); }
.dial-head { display: flex; align-items: baseline; gap: 8px; margin-bottom: 6px; }
.dial-name { font-size: 0.86rem; color: var(--text-2); }
.dial-ico { display: inline-block; margin-right: 6px; color: var(--ev); }
.ev-ico { display: inline-block; width: 1.05em; height: 1.05em; vertical-align: -0.17em; }
.dial-auto { display: none; font-size: 0.72rem; padding: 1px 7px; border-radius: 4px; background: rgba(255, 255, 255, 0.1); color: var(--text-2); }
.dial.is-auto .dial-auto { display: inline-block; }
.dial-value { margin-left: auto; font-stretch: 76%; font-weight: 680; font-size: 1.4rem; line-height: 1; color: var(--c); font-variant-numeric: tabular-nums; }
.dial-ring {
  display: flex; height: 54px; border-radius: 12px; overflow: hidden;
  background: var(--bg-3); border: 1px solid var(--line);
}
.dial-btn {
  flex: none; width: 42px; border: 0; padding: 0; color: var(--text); font: inherit; font-size: 1.35rem; line-height: 1;
  cursor: pointer;
  background: repeating-linear-gradient(90deg, rgba(255, 255, 255, 0.045) 0 2px, transparent 2px 5px), #303030;
}
.dial-btn:first-child { border-right: 1px solid var(--line); }
.dial-btn:last-child { border-left: 1px solid var(--line); }
.dial-btn:disabled { color: #5c5c5c; cursor: default; }
.dial-btn:not(:disabled):active { background-color: #3a3a3a; }
.dial-window {
  position: relative; flex: 1; overflow: hidden; cursor: grab; touch-action: pan-y;
  -webkit-mask-image: linear-gradient(90deg, transparent 0, #000 16%, #000 84%, transparent 100%);
  mask-image: linear-gradient(90deg, transparent 0, #000 16%, #000 84%, transparent 100%);
  user-select: none; -webkit-user-select: none;
}
.dial.is-dragging .dial-window { cursor: grabbing; }
.dial-track { position: absolute; top: 0; bottom: 0; left: 0; will-change: transform; }
.dial-mark { position: absolute; top: 0; bottom: 0; display: flex; justify-content: center; }
.dial-mark i { position: absolute; top: 0; left: 50%; width: 1px; height: 10px; background: #8a8a8a; }
.dial-mark.is-minor i { height: 6px; background: #6a6a6a; }
.dial-mark b {
  position: absolute; bottom: 9px; left: 0; right: 0; text-align: center;
  font-weight: 560; font-stretch: 78%; font-size: 0.98rem; color: #9c9c9c; font-variant-numeric: tabular-nums; white-space: nowrap;
}
.dial-mark.is-on b { color: var(--c); font-weight: 720; }
.dial-mark.is-on i { background: var(--c); }
.dial-index { position: absolute; left: 50%; top: 0; width: 3px; height: 16px; margin-left: -1.5px; background: var(--c); border-radius: 0 0 2px 2px; }
.dial.is-auto .dial-ring { opacity: 0.62; }
.dial.is-auto .dial-window { cursor: default; }
.dial-window:focus-visible { outline: 2px solid var(--c); outline-offset: -2px; border-radius: 8px; }
.dial-note { margin: 6px 0 0; font-size: 0.84rem; color: var(--muted); }

/* scelte a pulsanti */
.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chip {
  min-height: 40px; padding: 0 13px; border-radius: 8px;
  background: transparent; color: var(--text-2); border: 1px solid var(--line-2);
  font: inherit; font-size: 0.92rem; font-weight: 520; cursor: pointer;
}
.chip:hover { border-color: #6a6a6a; }
.chip[aria-checked="true"] { background: var(--text); color: #1a1a1a; border-color: var(--text); font-weight: 640; }
.chips--ap .chip[aria-checked="true"] { background: var(--ap); border-color: var(--ap); }
.chips--sh .chip[aria-checked="true"] { background: var(--sh); border-color: var(--sh); }
.chips--iso .chip[aria-checked="true"] { background: var(--iso); border-color: var(--iso); }
.chips--lens .chip[aria-checked="true"] { background: var(--lens); border-color: var(--lens); }
.chips--ev .chip[aria-checked="true"] { background: var(--ev); border-color: var(--ev); }
.chip:disabled { opacity: 0.4; cursor: default; }

/* interruttore */
.switch {
  display: inline-flex; align-items: center; gap: 10px; min-height: 42px; padding: 0;
  background: none; border: 0; color: var(--text-2); font: inherit; font-size: 0.95rem; cursor: pointer; text-align: left;
}
.switch-track { position: relative; flex: none; width: 42px; height: 26px; border-radius: 13px; background: #555; transition: background-color .15s; }
.switch-knob { position: absolute; top: 3px; left: 3px; width: 20px; height: 20px; border-radius: 50%; background: #dcdcdc; transition: transform .15s; }
.switch[aria-pressed="true"] .switch-track { background: var(--text); }
.switch[aria-pressed="true"] .switch-knob { transform: translateX(16px); background: #1d1d1d; }

/* pulsante del laboratorio */
.btn-lab {
  display: inline-flex; align-items: center; gap: 8px; min-height: 44px; padding: 0 16px; border-radius: 10px;
  background: var(--bg-3); color: var(--text); border: 1px solid var(--line-2);
  font: inherit; font-size: 0.95rem; font-weight: 600; cursor: pointer;
}
.btn-lab.is-primary { background: var(--text); color: #1a1a1a; border-color: var(--text); }
.btn-lab:disabled { opacity: 0.45; cursor: default; }
.btn-lab .ico { width: 18px; height: 18px; }

/* esposimetro */
.meter { display: grid; gap: 4px; }
.meter-head { display: flex; align-items: baseline; gap: 8px; }
.meter-name { font-size: 0.86rem; color: var(--text-2); }
.meter-text { margin-left: auto; font-stretch: 80%; font-weight: 650; font-size: 1.05rem; color: var(--text); font-variant-numeric: tabular-nums; }
.meter.is-ok .meter-text { color: var(--ok); }
.meter.is-out .meter-text { color: var(--warn); }
.meter-scale { position: relative; height: 24px; margin: 0 6px; }
.meter-tick { position: absolute; bottom: 0; width: 1px; height: 6px; background: #777; margin-left: -0.5px; }
.meter-tick.is-major { height: 11px; background: #a5a5a5; }
.meter-tick.is-zero { height: 16px; width: 2px; margin-left: -1px; background: var(--text); }
.meter-bar { position: absolute; top: 3px; height: 7px; background: var(--ev); border-radius: 1px; transition: left .12s, width .12s; }
.meter.is-ok .meter-bar { background: var(--ok); }
.meter-ptr { position: absolute; top: 0; width: 3px; height: 13px; margin-left: -1.5px; background: var(--text); border-radius: 1px; transition: left .12s; }
.meter-labels { display: flex; justify-content: space-between; font-size: 0.78rem; color: var(--muted); font-stretch: 80%; margin: 0 2px; }

/* didascalia dinamica */
.lab-caption {
  margin: 0; padding: 12px 14px; border-radius: 10px; background: var(--bg-2);
  font-size: 0.95rem; line-height: 1.5; color: var(--text-2); border: 1px solid var(--line);
}
.lab-caption b { font-weight: 650; }
.lab-caption b:not([class]) { color: var(--text); }
.lab-error { padding: 14px; border: 1px solid var(--warn); border-radius: 10px; color: var(--text); }

/* piccole schede dati */
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); gap: 8px; }
.stat { padding: 10px 12px; border-radius: 10px; background: var(--bg-2); border: 1px solid var(--line); }
.stat-k { display: block; font-size: 0.78rem; color: var(--muted); }
.stat-v { display: block; font-stretch: 80%; font-weight: 680; font-size: 1.25rem; color: var(--text); font-variant-numeric: tabular-nums; line-height: 1.2; }

/* diagrammi svg */
.diagram { width: 100%; height: auto; }
.diagram text { font-family: var(--font); }

/* ---------------- contenuti della lezione ---------------- */
.lesson-block { padding-top: 34px; padding-bottom: 34px; }
.lesson-block h2 { margin-bottom: 16px; font-size: clamp(1.3rem, 1.12rem + 0.7vw, 1.6rem); }
.prose { max-width: 40em; }
.prose p:last-child { margin-bottom: 0; }
.takeaways ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 12px; max-width: 44em; }
.takeaways li { position: relative; padding-left: 30px; }
.takeaways li::before { content: ''; position: absolute; left: 4px; top: 0.62em; width: 12px; height: 2px; background: var(--text); }
.exercise-box { padding: 18px 18px 6px; border-radius: 14px; background: var(--bg-2); border: 1px solid var(--line); max-width: 46em; }
.exercise-box p { max-width: 40em; }

/* quiz */
.quiz { display: grid; gap: 22px; max-width: 46em; }
.q { border: 0; margin: 0; padding: 0; min-width: 0; }
.q legend { padding: 0; margin-bottom: 10px; color: var(--text); font-weight: 620; font-size: 1.04rem; line-height: 1.4; }
.q-options { display: grid; gap: 8px; }
.q button {
  text-align: left; min-height: 48px; padding: 10px 14px; border-radius: 10px;
  background: transparent; border: 1px solid var(--line-2); color: var(--text-2);
  font: inherit; font-size: 0.97rem; line-height: 1.35; cursor: pointer;
}
.q button:hover:not(:disabled) { border-color: #777; }
.q button:disabled { cursor: default; }
.q button.is-right { border-color: var(--ok); color: var(--text); background: rgba(109, 212, 141, 0.1); }
.q button.is-wrong { border-color: var(--warn); color: var(--text); background: rgba(239, 102, 97, 0.1); }
.q-explain { margin: 10px 0 0; font-size: 0.95rem; color: var(--text-2); }
.q-verdict { font-weight: 680; color: var(--text); }

/* invito a seguire */
.follow { display: grid; gap: 18px; padding: 22px; border-radius: 16px; background: var(--bg-2); border: 1px solid var(--line); }
.follow-photo { width: 64px; height: 64px; border-radius: 50%; object-fit: cover; filter: grayscale(1); }
.follow h2 { font-size: 1.35rem; margin-bottom: 8px; }
.follow p { margin-bottom: 0.7em; max-width: 38em; }
.follow .cta-row { margin-top: 14px; }
@media (min-width: 760px) { .follow { grid-template-columns: 64px 1fr; gap: 22px; padding: 28px; } }

/* navigazione tra lezioni */
.lesson-nav { padding-top: 26px; padding-bottom: 40px; display: grid; gap: 16px; }
.lesson-actions { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.complete-btn {
  display: inline-flex; align-items: center; gap: 12px; min-height: 50px; padding: 0 20px 0 14px; border-radius: 999px;
  background: transparent; border: 1px solid var(--line-2); color: var(--text); font: inherit; font-weight: 600; cursor: pointer;
}
.complete-btn .lr-done { width: 26px; height: 26px; }
.complete-btn[aria-pressed="true"] { border-color: var(--ok); }
.complete-btn[aria-pressed="true"] .lr-done { background: var(--ok); border-color: var(--ok); color: #13301d; }
.pager { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.pager a {
  display: flex; align-items: center; gap: 10px; padding: 12px 12px; border-radius: 12px;
  border: 1px solid var(--line); text-decoration: none; min-height: 72px;
}
.pager a:hover { border-color: var(--line-2); background: var(--bg-2); }
.pager .p-body { display: flex; flex-direction: column; gap: 3px; flex: 1; min-width: 0; }
.pager .p-arrow {
  flex: none; display: grid; place-items: center; width: 34px; height: 34px; border-radius: 50%;
  background: var(--bg-3); color: var(--text); transition: transform 0.15s ease, background 0.15s ease;
}
.pager .p-arrow svg { width: 20px; height: 20px; }
.pager a:hover .p-arrow { background: var(--text); color: var(--bg); }
.pager .prev:hover .p-arrow { transform: translateX(-3px); }
.pager .next:hover .p-arrow { transform: translateX(3px); }
.pager .p-k { font-size: 0.82rem; color: var(--muted); }
.pager .p-t { color: var(--text); font-weight: 620; line-height: 1.25; }
.pager .next { text-align: right; grid-column: 2; }
@media (max-width: 560px) {
  .pager { grid-template-columns: 1fr; }
  .pager .next { grid-column: 1; order: -1; }
  .pager a { min-height: 64px; padding: 12px 14px; }
}


/* 404 */
.notfound { padding-top: 80px; padding-bottom: 80px; }

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

/* schemi sotto il visore */
.dof-diagram, .stage-extra {
  margin: 8px auto 0; padding: 6px 8px 2px; border-radius: 6px; background: var(--bg-lcd);
  width: min(100%, calc(var(--vh-max) * var(--ar, 1.5)));
}
.chip b { font-weight: 760; }
.stats { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.stats.stats-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.stats.stats-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
@media (min-width: 560px) { .stats.stats-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); } }
.stat-v { font-size: 1.12rem; overflow-wrap: anywhere; }
.fov-box { max-width: 320px; }
/* raffica di scatti (lezione AF) */
.burst { display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); gap: 5px; padding: 6px; }
.burst-cell { position: relative; aspect-ratio: 3 / 2; background: #2c2c2c; border-radius: 3px; overflow: hidden; border: 1px solid #3a3a3a; }
.burst-cell canvas { width: 100%; height: 100%; }
.burst-cell.is-ok { border-color: var(--ok); }
.burst-cell.is-ko { border-color: var(--warn); }
.burst-badge { position: absolute; right: 2px; bottom: 2px; width: 16px; height: 16px; border-radius: 50%; display: grid; place-items: center; font-size: 12px; line-height: 1; font-weight: 700; }
.is-ok .burst-badge { background: var(--ok); color: #13301d; }
.is-ko .burst-badge { background: var(--warn); color: #fff; }
.burst-badge .ico { width: 12px; height: 12px; }
.iso-chart { position: absolute; inset: 0; padding: 4px 6px; }
.iso-chart svg { width: 100%; height: 100%; }
.hist-canvas { display: block; width: 100%; height: auto; }
.hist-box { padding: 6px; }
.ettr-hists { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; padding: 8px; }
.mini-label { display: block; font-size: 0.74rem; color: var(--muted); margin-bottom: 4px; }
.stat-v.c-warn { color: var(--warn); }
.dial.no-badge .dial-auto { display: none !important; }
/* serie dello stacking */
.stack-strip { display: flex; align-items: center; gap: 4px; padding: 8px; min-height: 40px; }
.stack-cell { position: relative; flex: 1; height: 26px; border-radius: 3px; background: #343434; border: 1px solid #444; overflow: hidden; }
.stack-cell::after { content: ''; position: absolute; left: 0; right: 0; height: 3px; bottom: calc(var(--pos) * 80% + 10%); background: #ff3b30; opacity: 0.85; }
.stack-cell.is-on { border-color: var(--lens); background: #3b3546; }
.stack-more { font-size: 0.8rem; color: var(--muted); padding-left: 4px; font-variant-numeric: tabular-nums; }

/* figure dentro il pannello dei comandi */
.panel-figure { background: var(--bg-lcd); border-radius: 8px; padding: 6px; }
.panel-figure svg { display: block; width: 100%; height: auto; }

/* dritte finali, in ordine */
.tips ol { list-style: none; counter-reset: tip; margin: 0; padding: 0; display: grid; gap: 16px; max-width: 46em; }
.tips li { counter-increment: tip; display: grid; grid-template-columns: 2.6rem 1fr; gap: 10px; align-items: start; }
.tips li::before { content: counter(tip); font-stretch: 72%; font-weight: 650; font-size: 1.55rem; line-height: 1.05; color: var(--muted); font-variant-numeric: tabular-nums; }
.tips li p { margin: 0; }
/* ghiera fine (lezione sulla luce): etichette centrate sul segno */
.dial--fine .dial-mark b { left: 50%; right: auto; transform: translateX(-50%); }
/* grafico dell'altezza del sole: si trascina in orizzontale */
.sun-chart { touch-action: pan-y; cursor: ew-resize; user-select: none; -webkit-user-select: none; }
/* otturatore al rallentatore (lezione sul flash) */
.shutter-fig { display: grid; gap: 6px; padding: 8px 10px 10px; }
.shutter-canvas { display: block; width: 100%; }
.shutter-note { margin: 0; font-size: 0.86rem; line-height: 1.45; color: var(--text-2); }
.switch:disabled { opacity: 0.4; cursor: default; }