/* Tutorial Guident — foglio di stile condiviso */

:root {
  --brand: #0ea5e9;
  --brand-dark: #0284c7;
  --brand-soft: #e0f2fe;
  --ink: #0f172a;
  --body: #334155;
  --muted: #64748b;
  --line: #e2e8f0;
  --bg: #ffffff;
  --bg-alt: #f8fafc;
  --warn-bg: #fffbeb;
  --warn-line: #fcd34d;
  --ok-bg: #f0fdf4;
  --ok-line: #86efac;
  --stop-bg: #fef2f2;
  --stop-line: #fca5a5;
  --radius: 12px;
  --maxw: 760px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  font-size: 17px;
  line-height: 1.65;
  color: var(--body);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

/* ---------- intestazione ---------- */

.topbar {
  border-bottom: 1px solid var(--line);
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 10;
}

.topbar__inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  font-weight: 700;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: -0.01em;
  font-size: 1.05rem;
}
.brand span { color: var(--brand); }

.topbar__link {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.9rem;
}
.topbar__link:hover { color: var(--brand-dark); }

/* ---------- impaginato ---------- */

main {
  max-width: var(--maxw);
  margin: 0 auto;
  padding-block: 40px 64px;
  padding-inline: 20px;
}

h1 {
  font-size: clamp(1.7rem, 4.5vw, 2.3rem);
  line-height: 1.2;
  color: var(--ink);
  letter-spacing: -0.02em;
  margin: 0 0 12px;
}

h2 {
  font-size: 1.3rem;
  color: var(--ink);
  margin: 40px 0 12px;
  letter-spacing: -0.01em;
}

h3 {
  font-size: 1.08rem;
  color: var(--ink);
  margin: 28px 0 8px;
}

p { margin: 0 0 16px; }

a { color: var(--brand-dark); }

.lead {
  font-size: 1.12rem;
  color: var(--muted);
  margin-bottom: 28px;
}

.step-label {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--brand-dark);
  background: var(--brand-soft);
  padding: 4px 10px;
  border-radius: 999px;
  margin-bottom: 14px;
}

/* ---------- elenchi ---------- */

ul, ol { padding-left: 22px; margin: 0 0 16px; }
li { margin-bottom: 8px; }

ol.steps {
  counter-reset: step;
  list-style: none;
  padding-left: 0;
}

ol.steps > li {
  counter-increment: step;
  position: relative;
  padding-left: 44px;
  margin-bottom: 20px;
}

ol.steps > li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 1px;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: var(--brand);
  color: #fff;
  font-weight: 700;
  font-size: 0.92rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ---------- riquadri ---------- */

.note, .warn, .ok, .stop {
  border-left: 4px solid;
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 16px 18px;
  margin: 24px 0;
}
.note  { background: var(--bg-alt); border-color: var(--brand); }
.warn  { background: var(--warn-bg); border-color: var(--warn-line); }
.ok    { background: var(--ok-bg);   border-color: var(--ok-line); }
.stop  { background: var(--stop-bg); border-color: var(--stop-line); }

.note > :last-child,
.warn > :last-child,
.ok > :last-child,
.stop > :last-child { margin-bottom: 0; }

.box-title {
  font-weight: 700;
  color: var(--ink);
  display: block;
  margin-bottom: 4px;
}

/* ---------- figure ---------- */

figure {
  margin: 24px 0;
  padding: 0;
}

figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
}

figcaption {
  margin-top: 8px;
  font-size: 0.86rem;
  color: var(--muted);
  line-height: 1.45;
}

/* ---------- tabelle ---------- */

.table-wrap { overflow-x: auto; margin: 20px 0; }

table {
  border-collapse: collapse;
  width: 100%;
  font-size: 0.95rem;
}

th, td {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

th {
  background: var(--bg-alt);
  color: var(--ink);
  font-weight: 600;
  white-space: nowrap;
}

/* ---------- indice ---------- */

.toc { list-style: none; padding: 0; margin: 28px 0; }

.toc li { margin-bottom: 10px; }

.toc a {
  display: flex;
  gap: 14px;
  align-items: baseline;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--ink);
  transition: border-color .15s, background .15s;
}

.toc a:hover { border-color: var(--brand); background: var(--bg-alt); }

.toc__num {
  font-weight: 700;
  color: var(--brand);
  min-width: 22px;
}

.toc__text strong { display: block; }
.toc__text span { color: var(--muted); font-size: 0.92rem; }

/* ---------- navigazione ---------- */

.pager {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
  flex-wrap: wrap;
}

.pager a {
  text-decoration: none;
  color: var(--brand-dark);
  font-weight: 600;
  padding: 10px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.pager a:hover { border-color: var(--brand); background: var(--bg-alt); }
.pager a.next { background: var(--brand); color: #fff; border-color: var(--brand); }
.pager a.next:hover { background: var(--brand-dark); }

/* ---------- barra di avanzamento ---------- */

.progress {
  display: flex;
  gap: 5px;
  margin-bottom: 26px;
}

.progress i {
  height: 4px;
  flex: 1;
  border-radius: 2px;
  background: var(--line);
}
.progress i.done { background: var(--brand); }

/* ---------- pieghevole ---------- */

details {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px 18px;
  margin-bottom: 12px;
}
details[open] { background: var(--bg-alt); }
summary { cursor: pointer; font-weight: 600; color: var(--ink); }
summary::marker { color: var(--brand); }
details > p { margin-top: 12px; }

kbd {
  background: var(--bg-alt);
  border: 1px solid var(--line);
  border-bottom-width: 2px;
  border-radius: 6px;
  padding: 2px 7px;
  font-size: 0.88em;
  font-family: inherit;
  color: var(--ink);
  white-space: nowrap;
}

footer {
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.88rem;
  padding: 24px 20px 40px;
  text-align: center;
}

@media (max-width: 480px) {
  body { font-size: 16px; }
  .pager { flex-direction: column; }
  .pager a { text-align: center; }
}