/* ===== Palette e temi ===== */
:root {
  --bg: #faf9f5;
  --bg2: #f1efe8;
  --card: #ffffff;
  --text: #2c2c2a;
  --muted: #5f5e5a;
  --faint: #888780;
  --border: rgba(60, 60, 55, 0.16);
  --border-strong: rgba(60, 60, 55, 0.32);
  --accent: #ba7517;
  --link: #185fa5;
  --code-bg: #f1efe8;

  --purple: #7f77dd;
  --purple-soft: #eeedfe;
  --purple-ink: #3c3489;
  --teal: #1d9e75;
  --teal-soft: #e1f5ee;
  --teal-ink: #085041;
  --amber: #ef9f27;
  --amber-soft: #faeeda;
  --amber-ink: #633806;
  --coral: #d85a30;
  --coral-soft: #faece7;
  --coral-ink: #712b13;
  --red-soft: #fcebeb;
  --red-ink: #791f1f;
  --gray-fill: #d3d1c7;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1f1e1b;
    --bg2: #2a2926;
    --card: #262522;
    --text: #e8e6df;
    --muted: #b4b2a9;
    --faint: #888780;
    --border: rgba(220, 220, 210, 0.16);
    --border-strong: rgba(220, 220, 210, 0.34);
    --accent: #ef9f27;
    --link: #85b7eb;
    --code-bg: #2a2926;

    --purple-soft: #3c3489;
    --purple-ink: #cecbf6;
    --teal-soft: #085041;
    --teal-ink: #9fe1cb;
    --amber-soft: #633806;
    --amber-ink: #fac775;
    --coral-soft: #712b13;
    --coral-ink: #f5c4b3;
    --red-soft: #501313;
    --red-ink: #f7c1c1;
    --gray-fill: #44443f;
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
}

.loading { padding: 3rem; color: var(--muted); }

/* ===== Layout ===== */
.layout { display: flex; min-height: 100vh; }

.sidebar {
  width: 250px;
  flex-shrink: 0;
  border-right: 1px solid var(--border);
  padding: 1.5rem 1rem;
  position: sticky;
  top: 0;
  align-self: flex-start;
  height: 100vh;
  overflow-y: auto;
}

.sidebar .brand {
  font-weight: 600;
  font-size: 15px;
  margin: 0 0 0.25rem;
}
.sidebar .brand-sub {
  font-size: 12.5px;
  color: var(--muted);
  margin: 0 0 1.25rem;
}

.sidebar nav a {
  display: block;
  padding: 7px 10px;
  margin-bottom: 2px;
  border-radius: 8px;
  color: var(--text);
  text-decoration: none;
  font-size: 14px;
}
.sidebar nav a:hover { background: var(--bg2); }
.sidebar nav a.active { background: var(--bg2); font-weight: 600; }
.sidebar nav a .num { color: var(--faint); margin-right: 6px; font-variant-numeric: tabular-nums; }

.content {
  flex: 1;
  min-width: 0;
  padding: 2.5rem 2rem 4rem;
}
.content > .inner { max-width: 760px; margin: 0 auto; }

@media (max-width: 820px) {
  .layout { flex-direction: column; }
  .sidebar {
    width: 100%;
    height: auto;
    position: static;
    border-right: none;
    border-bottom: 1px solid var(--border);
    padding: 1rem;
  }
  .sidebar nav { display: flex; flex-wrap: wrap; gap: 4px; }
  .sidebar nav a { padding: 5px 10px; }
  .content { padding: 1.5rem 1rem 3rem; }
}

/* ===== Tipografia ===== */
h1 { font-size: 28px; line-height: 1.3; font-weight: 650; margin: 0 0 0.5rem; }
h2 { font-size: 21px; font-weight: 600; margin: 2.2rem 0 0.8rem; }
h3 { font-size: 17px; font-weight: 600; margin: 1.8rem 0 0.6rem; }
p { margin: 0 0 1rem; }
.kicker {
  font-size: 13px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 600;
  margin: 0 0 0.4rem;
}
.lead { font-size: 17.5px; color: var(--muted); }

a { color: var(--link); }

blockquote {
  margin: 1.4rem 0;
  padding: 0.2rem 1.2rem;
  border-left: 3px solid var(--accent);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 17px;
  color: var(--muted);
}

code {
  font-family: Consolas, "Cascadia Code", monospace;
  font-size: 0.9em;
  background: var(--code-bg);
  padding: 1px 5px;
  border-radius: 5px;
}

pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem 1.2rem;
  overflow-x: auto;
  line-height: 1.55;
  margin: 1.2rem 0;
}
pre code { background: none; padding: 0; font-size: 13.5px; }

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14.5px;
  margin: 1.2rem 0;
}
th, td {
  text-align: left;
  padding: 8px 10px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
th { font-weight: 600; color: var(--muted); font-size: 13.5px; }

ul, ol { padding-left: 1.4rem; margin: 0 0 1rem; }
li { margin-bottom: 0.5rem; }

hr { border: none; border-top: 1px solid var(--border); margin: 2.5rem 0; }

/* ===== Componenti didattici ===== */
.figure {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1.2rem;
  margin: 1.5rem 0;
}
.figure figcaption {
  font-size: 13px;
  color: var(--muted);
  margin-top: 0.6rem;
  text-align: center;
}

.widget {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1.4rem;
  margin: 1.5rem 0;
}
.widget .widget-title {
  font-size: 13px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  font-weight: 600;
  color: var(--accent);
  margin: 0 0 1rem;
}

.callout {
  background: var(--bg2);
  border-radius: 12px;
  padding: 1rem 1.2rem;
  margin: 1.2rem 0;
  font-size: 15px;
}
.callout .callout-label { font-weight: 600; }

.homework {
  border: 1px dashed var(--border-strong);
  border-radius: 12px;
  padding: 1.2rem 1.4rem;
  margin: 2rem 0;
}
.homework h3 { margin-top: 0; }

.pager {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}
.pager a {
  text-decoration: none;
  font-size: 14.5px;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text);
  max-width: 48%;
}
.pager a:hover { background: var(--bg2); }
.pager .dir { display: block; font-size: 12px; color: var(--faint); }

/* ===== Controlli widget ===== */
.ctl-row { display: flex; align-items: center; gap: 12px; margin-bottom: 0.7rem; }
.ctl-row label { font-size: 13px; color: var(--muted); min-width: 150px; }
.ctl-row .val { font-size: 13px; font-weight: 600; min-width: 70px; text-align: right; font-variant-numeric: tabular-nums; }
.ctl-row input[type="range"] { flex: 1; accent-color: var(--accent); }
.ctl-note { font-size: 12.5px; color: var(--faint); margin: 0.6rem 0 0; }

button {
  font: inherit;
  font-size: 14px;
  padding: 7px 14px;
  border: 1px solid var(--border-strong);
  border-radius: 9px;
  background: transparent;
  color: var(--text);
  cursor: pointer;
}
button:hover:not(:disabled) { background: var(--bg2); }
button:active:not(:disabled) { transform: scale(0.98); }
button:disabled { opacity: 0.55; cursor: default; }

select {
  font: inherit;
  font-size: 13.5px;
  padding: 5px 8px;
  border: 1px solid var(--border-strong);
  border-radius: 8px;
  background: var(--card);
  color: var(--text);
}

.bar-track {
  position: relative;
  height: 18px;
  background: var(--bg2);
  border-radius: 5px;
  overflow: hidden;
}
.bar-fill { position: absolute; left: 0; top: 0; height: 100%; border-radius: 5px; }

.metric-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 12px;
  margin: 1rem 0;
}
.metric {
  background: var(--bg2);
  border-radius: 10px;
  padding: 0.9rem 1rem;
}
.metric .m-label { font-size: 12.5px; color: var(--muted); }
.metric .m-value { font-size: 23px; font-weight: 600; }
.metric .m-note { font-size: 11.5px; color: var(--faint); }

.chip {
  display: inline-block;
  font-size: 14px;
  padding: 2px 9px;
  border-radius: 7px;
  margin: 0 2px;
}
.chip-ok { background: var(--teal-soft); color: var(--teal-ink); }
.chip-bonus { background: var(--amber-soft); color: var(--amber-ink); }
.chip-no { background: var(--red-soft); color: var(--red-ink); text-decoration: line-through; }
.chip-tally { background: var(--bg2); color: var(--text); font-size: 13px; }

/* ===== SVG diagrammi ===== */
.diagram { width: 100%; height: auto; display: block; }
.diagram text { font-family: "Segoe UI", system-ui, sans-serif; }
.diagram .t  { font-size: 14px; fill: var(--text); }
.diagram .ts { font-size: 12px; fill: var(--muted); }
.diagram .th { font-size: 14px; font-weight: 600; fill: var(--text); }

.diagram .d-box rect { fill: var(--bg2); stroke: var(--border-strong); }
.diagram .d-purple rect, rect.d-purple { fill: var(--purple-soft); stroke: var(--purple); }
.diagram .d-purple text { fill: var(--purple-ink); }
.diagram .d-teal rect, rect.d-teal { fill: var(--teal-soft); stroke: var(--teal); }
.diagram .d-teal text { fill: var(--teal-ink); }
.diagram .d-amber rect, rect.d-amber { fill: var(--amber-soft); stroke: var(--amber); }
.diagram .d-amber text { fill: var(--amber-ink); }
.diagram .d-coral rect, rect.d-coral { fill: var(--coral-soft); stroke: var(--coral); }
.diagram .d-coral text { fill: var(--coral-ink); }

.diagram .arr { stroke: var(--faint); stroke-width: 1.5; fill: none; }
.diagram .dashed-box { fill: none; stroke: var(--faint); stroke-width: 0.8; stroke-dasharray: 6 4; }