/* Cadenza — foglio di stile unico.
   Token derivati da docs/DESIGN.md (design system stile MiniMax: IBM Plex,
   pill nere, palette monocromatica + accenti brand).
   Font IBM Plex self-hosted in assets/fonts/ (nessuna dipendenza da CDN esterni). */

@import url('/assets/fonts/fonts.css');

:root {
  /* Colori */
  --color-primary: #0a0a0a;
  --color-on-primary: #ffffff;
  --color-charcoal: #222222;
  --color-slate: #45515e;
  --color-steel: #5f5f5f;
  --color-stone: #8e8e93;
  --color-muted: #a8aab2;
  --color-canvas: #ffffff;
  --color-surface: #f7f8fa;
  --color-surface-soft: #f2f3f5;
  --color-hairline: #e5e7eb;
  --color-hairline-soft: #eaecf0;
  --color-ink: #0a0a0a;
  --brand-coral: #ff5530;
  --brand-magenta: #ea5ec1;
  --brand-blue: #1456f0;
  --brand-blue-deep: #1d4ed8;
  --brand-purple: #a855f7;
  --footer-bg: #0a0a0a;
  --success-bg: #e8ffea;
  --success-text: #1ba673;

  /* Tipografia */
  --font-sans: 'IBM Plex Sans', Inter, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, monospace;

  /* Spacing */
  --sp-xxs: 4px; --sp-xs: 8px; --sp-sm: 12px; --sp-md: 16px; --sp-lg: 20px;
  --sp-xl: 24px; --sp-xxl: 32px; --sp-xxxl: 40px;
  --sp-section: 64px; --sp-section-lg: 80px;

  /* Radius */
  --r-sm: 6px; --r-md: 8px; --r-lg: 12px; --r-xl: 16px; --r-hero: 32px; --r-full: 9999px;

  --container: 1280px;
  --prose: 720px;
}

/* ---- tema scuro ---- */
:root[data-theme="dark"] {
  --color-canvas: #0d0d0f;
  --color-surface: #17171a;
  --color-surface-soft: #1e1e22;
  --color-charcoal: #e6e6e8;
  --color-ink: #f5f5f7;
  --color-slate: #c2c6cd;
  --color-steel: #a2a8b2;
  --color-stone: #7f858e;
  --color-muted: #6b7078;
  --color-hairline: #2a2a2f;
  --color-hairline-soft: #232327;
  --color-primary: #f5f5f7;
  --color-on-primary: #0d0d0f;
  --brand-blue-deep: #6ea0ff;
}
/* Nel tema scuro il corpo degli articoli usa un grigio meno contrastato del bianco. */
:root[data-theme="dark"] .prose { color: #a7a7a7; }

/* ---- reset di base ---- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
/* spazio sopra gli heading quando si salta a un anchor */
.prose h2, .prose h3, .prose h4 { scroll-margin-top: var(--sp-xl); }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.5;
  color: var(--color-charcoal);
  background-color: var(--color-canvas);
  /* Sfumature di colore molto leggere fisse sullo sfondo (note di colore brand). */
  background-image:
    radial-gradient(1100px 600px at 8% -6%, rgba(255, 85, 48, 0.05), transparent 60%),
    radial-gradient(1000px 560px at 100% 2%, rgba(20, 86, 240, 0.05), transparent 58%),
    radial-gradient(900px 600px at 50% 108%, rgba(168, 85, 247, 0.05), transparent 60%);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--color-ink); text-decoration: none; }
a:hover { text-decoration: underline; }

.container { max-width: var(--container); margin: 0 auto; padding: 0 var(--sp-xxl); }

/* ---- header (scorre con la pagina, non fisso) ---- */
.site-header {
  border-bottom: 1px solid var(--color-hairline-soft);
  background: var(--color-canvas);
}
.header-inner {
  display: flex; align-items: center; justify-content: flex-end;
  gap: var(--sp-lg); height: 64px;
}
.site-nav { display: flex; gap: var(--sp-lg); }
.site-nav a { font-size: 18px; font-weight: 500; color: var(--color-charcoal); }

/* toggle tema chiaro/scuro */
.theme-toggle {
  display: inline-flex; align-items: center; justify-content: center;
  width: 34px; height: 34px; padding: 0;
  background: none; border: 1px solid var(--color-hairline); border-radius: var(--r-full);
  color: var(--color-charcoal); font-size: 15px; cursor: pointer; line-height: 1;
}
.theme-toggle:hover { background: var(--color-surface); }
.theme-toggle .sun { display: none; }
:root[data-theme="dark"] .theme-toggle .moon { display: none; }
:root[data-theme="dark"] .theme-toggle .sun { display: inline; }

/* ---- footer (bianco) ---- */
.site-footer { color: var(--color-ink);
  border-top: 1px solid var(--color-hairline);
  margin-top: var(--sp-section-lg); padding: var(--sp-section) 0;
}
.footer-brand { font-family: var(--font-mono); font-style: italic; font-weight: 600; font-size: 20px; color: var(--color-ink); }
.footer-pages { display: flex; flex-wrap: wrap; gap: var(--sp-md); margin-top: var(--sp-sm); }
.footer-pages a { color: var(--color-steel); font-size: 15px; font-weight: 500; }
.footer-pages a:hover { color: var(--color-ink); }
.footer-copy { color: var(--color-steel); font-size: 14px; margin: var(--sp-sm) 0 0; }
.footer-kofi { display: flex; justify-content: flex-end; margin-top: var(--sp-sm); }

/* ---- main ---- */
main.container { padding-top: var(--sp-section); padding-bottom: var(--sp-xxl); }
.section-title {
  font-family: var(--font-mono); font-weight: 600; font-size: 24px;
  letter-spacing: -0.5px; color: var(--color-ink);
  margin: 0 0 var(--sp-xl);
}

/* ---- bottone pill ---- */
.btn {
  display: inline-block; background: var(--color-primary); color: var(--color-on-primary);
  font-size: 14px; font-weight: 600; padding: 11px 24px; border-radius: var(--r-full);
}
.btn:hover { background: var(--color-charcoal); text-decoration: none; }

/* ---- kicker (tipo: nome per esteso, mono corsivo) ---- */
.kicker {
  font-family: var(--font-mono); font-style: italic; font-weight: 400;
  font-size: 15px; letter-spacing: 0.2px; color: var(--color-steel);
  margin-bottom: var(--sp-sm);
}

/* ---- home (stessa larghezza delle pagine articolo) ---- */
.home { max-width: var(--prose); margin: 0 auto; }
.home-hero { padding: var(--sp-xxl) 0 var(--sp-section); text-align: center; }
.home-title {
  font-family: var(--font-mono); font-style: italic; font-weight: 600;
  font-size: clamp(40px, 8vw, 80px); line-height: 1.1; letter-spacing: -2px;
  color: var(--color-ink); margin: 0;
  /* Sempre su una riga: scala il font e non manda a capo. */
  white-space: nowrap;
}
.home-desc { font-size: 18px; color: var(--color-steel); margin: var(--sp-md) auto 0; max-width: var(--prose); }

/* ---- lista articoli home (senza bullet) ---- */
.post-list { list-style: none; margin: 0; padding: 0; }
.post-item {
  padding: var(--sp-xl) 0;
  border-bottom: 1px solid var(--color-hairline);
}
.post-item:first-child { padding-top: 0; }
.post-title { font-family: var(--font-mono); font-style: italic;font-weight: 600; font-size: 36px; line-height: 1.25; letter-spacing: -2px; margin: 0 0 var(--sp-xs); }
/* Titolo articolo in home: stessa nota di colore per categoria della pagina articolo. */
.post-title a {
  background: linear-gradient(120deg, var(--cat-accent, #1456f0), var(--cat-accent-2, #a855f7));
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
}
.post-desc { color: var(--color-slate); font-size: 22px; line-height: 1.5; margin: 0 0 0 60px; max-width: var(--prose); }

/* ---- card grid ---- */
.card-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--sp-xl);
}
.card {
  border: 1px solid var(--color-hairline); border-radius: var(--r-xl);
  overflow: hidden; background: var(--color-canvas); display: flex; flex-direction: column;
}
.card-cover img { aspect-ratio: 16/9; object-fit: cover; width: 100%; }
.card-body { padding: var(--sp-xl); display: flex; flex-direction: column; gap: var(--sp-xs); flex: 1;
  /* Tinta categoria molto leggera (accento al 5%, cioè trasparente al 95%). */
  background: linear-gradient(0deg, transparent 0%, color-mix(in srgb, var(--cat-accent) 10%, transparent) 50%); }
.card-meta { display: flex; gap: var(--sp-sm); align-items: center; font-size: 14px; color: var(--color-steel); }
.card-cat {
  background: var(--cat-accent, var(--color-primary)); color: #fff;
  font-size: 14px; font-weight: 600; padding: 2px 10px; border-radius: var(--r-full);
}
.card-cat:hover { text-decoration: none; filter: brightness(0.92); }
.card-title { font-size: 24px; font-weight: 600; line-height: 1.35; margin: 0; }
.card-desc { color: var(--color-slate); font-size: 16px; margin: 0; flex: 1; }
.card-foot { font-size: 14px; color: var(--color-stone); margin-top: var(--sp-xs); }

/* ---- tassonomia ---- */
.tax-hero { border-bottom: 1px solid var(--color-hairline); margin-bottom: var(--sp-xxl); }
.tax-kind { font-size: 18px; font-weight: 600; text-transform: uppercase; color: var(--color-steel); letter-spacing: 0.5px; }
.tax-title { font-family: var(--font-mono); font-size: 40px; font-weight: 600; letter-spacing: -1px; margin: var(--sp-xs) 0; }
.tax-count { color: var(--color-steel); margin: 0 0 var(--sp-xl); }

/* ---- articolo ---- */
.article, .page { max-width: var(--prose); margin: 0 auto; }
.article-header { margin-bottom: var(--sp-xl); }
.article-cat {
  display: inline-block; background: var(--cat-accent, var(--color-primary)); color: #fff;
  font-size: 14px; font-weight: 600; padding: 3px 12px; border-radius: var(--r-full);
}
.article-cat:hover { text-decoration: none; filter: brightness(0.92); }
.article-title {
  font-family: var(--font-mono); font-style: italic; font-weight: 600;
  font-size: clamp(38px, 6vw, 58px); line-height: 1.12; letter-spacing: -3px;
  margin: 0 0 var(--sp-md);
  /* Riempimento a sfumatura colorata basata sulla categoria (nota di colore). */
  background: linear-gradient(120deg, var(--cat-accent, #1456f0), var(--cat-accent-2, #a855f7));
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
}
/* Titolo delle pagine statiche: stessa scala del titolo articolo, mono corsivo. */
.page-title {
  font-family: var(--font-mono); font-style: italic; font-weight: 600;
  font-size: clamp(38px, 6vw, 58px); line-height: 1.12; letter-spacing: -3px;
  color: var(--color-ink); margin: 0 0 var(--sp-md);
}
.article-lead { font-size: 24px; color: var(--color-ink); line-height: 1.5; margin: 0 0 var(--sp-md); }
.article-meta { display: flex; flex-wrap: wrap; align-items: center; gap: var(--sp-sm); font-size: 16px; color: var(--color-steel); }
.article-meta-text { display: inline-flex; gap: 0; }
.article-cover { margin: var(--sp-xl) 0; }
.article-cover img { border-radius: var(--r-lg); width: 100%; }
.article-tags { display: flex; flex-wrap: wrap; gap: var(--sp-xs); margin-top: var(--sp-xxl); padding-top: var(--sp-xl); border-top: 1px solid var(--color-hairline); }
.tag {
  font-size: 16px; color: var(--cat-accent, var(--color-steel));
  background: color-mix(in srgb, var(--cat-accent, #8e8e93) 10%, transparent);
  border: 1px solid color-mix(in srgb, var(--cat-accent, #8e8e93) 30%, transparent);
  padding: 4px 12px; border-radius: var(--r-full);
}
.tag:hover { text-decoration: none; filter: brightness(0.92); }

/* ---- TOC ---- */
.toc {
  background: var(--color-surface); border: 1px solid var(--color-hairline);
  border-radius: var(--r-lg); padding: var(--sp-lg) var(--sp-xl); margin: var(--sp-xl) 0;
}
.toc-title { font-size: 14px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.5px; color: var(--color-steel); margin-bottom: var(--sp-xs); }
.toc ul { list-style: none; margin: 0; padding: 0; }
.toc li { padding: 3px 0; font-size: 14px; }
.toc li.toc-h3 { padding-left: var(--sp-md); }
.toc a { color: var(--color-slate); }

/* ---- prosa markdown ---- */
.prose { font-size: 20px; line-height: 1.65; color: var(--color-charcoal); }
.prose h2 {
  font-family: var(--font-sans); font-weight: 600; font-size: 32px;
  letter-spacing: -0.5px; line-height: 1.25; color: var(--color-ink);
  margin: var(--sp-xxxl) 0 var(--sp-md);
}
.prose h3 {
  font-family: var(--font-mono); font-weight: 600; font-size: 24px;
  line-height: 1.3; color: var(--color-ink); margin: var(--sp-xxl) 0 var(--sp-sm);
}
.prose h4 { font-size: 18px; font-weight: 600; margin: var(--sp-xl) 0 var(--sp-xs); }
/* Evidenziatore dietro il testo dell'heading: stesso colore categoria come
   background, ma alto solo il 50% del font (metà inferiore), tipo pennarello.
   Applicato allo <span.hl> inline (iniettato in lib/markdown.js) con
   box-decoration-break:clone, così lo sfondo segue il testo riga per riga
   anche quando va a capo. */
.prose h2 .hl,
.prose h3 .hl,
.prose h4 .hl {
  display: inline;
  -webkit-box-decoration-break: clone;
  box-decoration-break: clone;
  background-image: linear-gradient(
    to top,
    color-mix(in srgb, var(--cat-accent, var(--brand-blue)) 20%, transparent) 50%,
    transparent 50%
  );
}
.prose p { margin: 0 0 var(--sp-md); }
.prose ul, .prose ol { margin: 0 0 var(--sp-md); padding-left: var(--sp-xl); }
.prose li { margin: var(--sp-xxs) 0; }
.prose a { color: var(--brand-blue-deep); text-decoration: underline; text-underline-offset: 2px; }
.prose blockquote {
  margin: var(--sp-xl) 0; padding: var(--sp-md) var(--sp-xl);
  border-left: 4px solid var(--cat-accent); background: var(--color-surface);
  color: var(--cat-accent); border-radius: 0 var(--r-md) var(--r-md) 0;
  font-size: 18px; background: linear-gradient(45deg, transparent 0%, color-mix(in srgb, var(--cat-accent) 5%, transparent) 50%);
}

.prose blockquote p:last-child { margin: 0; }
.prose hr { border: none; border-top: 1px solid var(--color-hairline); margin: var(--sp-xxl) 0; }
.prose img { border-radius: var(--r-md); margin: var(--sp-xl) 0; }

/* codice */
.prose code {
  font-family: var(--font-mono); font-size: 0.9em;
  background: var(--color-surface); padding: 2px 6px; border-radius: var(--r-sm);
}
.prose pre {
  background: var(--color-primary); color: var(--color-on-primary);
  padding: var(--sp-lg); border-radius: var(--r-md); overflow-x: auto; margin: var(--sp-xl) 0;
}
.prose pre code { background: none; padding: 0; color: inherit; font-size: 14px; }

/* tabelle */
.prose table {
  width: 100%; border-collapse: collapse; margin: var(--sp-xl) 0; font-size: 16px;
  border: 1px solid var(--color-hairline); border-radius: var(--r-md); overflow: hidden;
}
.prose thead { background: var(--color-surface); }
.prose th { text-align: left; font-weight: 600; color: var(--color-steel); font-size: 16px; }
.prose th, .prose td { padding: var(--sp-sm) var(--sp-md); border-bottom: 1px solid var(--color-hairline-soft); }
.prose tr:last-child td { border-bottom: none; }

/* anchor sugli heading: nascosto, appare (grigio chiaro, no underline) all'hover del titolo.
   Selettore .prose per battere la regola link blu sottolineato di .prose a. */
.prose a.heading-anchor {
  color: var(--color-muted); margin-left: var(--sp-xs); font-weight: 400;
  text-decoration: none; opacity: 0; transition: opacity 0.15s ease;
}
.prose h2:hover a.heading-anchor,
.prose h3:hover a.heading-anchor,
.prose h4:hover a.heading-anchor,
.prose a.heading-anchor:focus { opacity: 1; }
.prose a.heading-anchor:hover { color: var(--color-muted); text-decoration: none; }

/* ---- pulsante "torna su" ---- */
.back-to-top {
  position: fixed; right: var(--sp-lg); bottom: var(--sp-lg);
  width: 2.75rem; height: 2.75rem; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.25rem; line-height: 1; cursor: pointer;
  background: var(--color-bg); color: var(--color-text);
  border: 1px solid var(--color-border);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.12);
  opacity: 0; visibility: hidden; transform: translateY(0.5rem);
  transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s;
}
.back-to-top.is-visible { opacity: 1; visibility: visible; transform: translateY(0); }
.back-to-top:hover { background: var(--color-primary); color: var(--color-on-primary); border-color: var(--color-primary); }
@media (prefers-reduced-motion: reduce) { .back-to-top { transition: opacity 0.2s ease; } }

/* ---- chart (SVG a build-time) ---- */
.chart { margin: var(--sp-xxl) 0; }
.chart-title { font-family: var(--font-mono); font-weight: 600; font-size: 16px; color: var(--color-ink); margin-bottom: var(--sp-md); }
.chart-note { font-size: 16px; color: var(--color-steel); line-height: 1.6; margin-top: var(--sp-sm); }
.chart-svg { width: 100%; height: auto; }
.chart-svg .chart-label { font-family: var(--font-sans); font-size: 16px; fill: var(--color-slate); }
.chart-svg .chart-value { font-family: var(--font-mono); font-size: 14px; font-weight: 600; fill: var(--color-ink); dominant-baseline: central; }
.chart-donut { display: flex; gap: var(--sp-xl); align-items: center; flex-wrap: wrap; }
.chart-svg--donut { max-width: 240px; flex: 0 0 auto; }
.chart-legend { list-style: none; margin: 0; padding: 0; font-size: 14px; }
.chart-legend li { display: flex; align-items: center; gap: var(--sp-xs); padding: var(--sp-xxs) 0; }
.chart-swatch { width: 12px; height: 12px; border-radius: 3px; display: inline-block; flex: 0 0 auto; }
.chart-pct { color: var(--color-steel); }
.chart--error { color: #d45656; font-size: 14px; }

/* ---- 404 ---- */
.notfound { text-align: center; padding: var(--sp-section-lg) 0; }
.notfound h1 { font-family: var(--font-mono); font-size: 80px; margin: 0; letter-spacing: -2px; }

/* ---- responsive ---- */
@media (max-width: 1023px) {
  .card-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 767px) {
  .container { padding: 0 var(--sp-lg); }
  .card-grid { grid-template-columns: 1fr; }
  .site-nav { gap: var(--sp-md); }
  .chart-donut { justify-content: center; }
}