/* ============================================================================
   main.css — Design system condiviso (OLTREMATICA × UDA)
   ============================================================================ */

:root {
  --navy: #0b1f3a;
  --navy-2: #102a4c;
  --navy-3: #16365f;
  --blue: #2563eb;
  --blue-600: #1d4ed8;
  --cyan: #06b6d4;
  --violet: #7c3aed;
  --amber: #f59e0b;
  --green: #10b981;
  --red: #ef4444;

  --ink: #0f172a;
  --muted: #64748b;
  --line: #e6ebf3;
  --bg: #f5f8fc;
  --card: #ffffff;
  --soft: #eef3fb;

  --grad-brand: linear-gradient(120deg, #2563eb 0%, #06b6d4 100%);
  --grad-deep: linear-gradient(135deg, #0b1f3a 0%, #16365f 60%, #1e4a86 100%);

  --radius: 16px;
  --radius-sm: 10px;
  --radius-lg: 22px;
  /* ombre stratificate: contatto morbido + diffusione ampia */
  --shadow-xs: 0 1px 2px rgba(15, 23, 42, .05);
  --shadow: 0 1px 2px rgba(15, 23, 42, .04), 0 10px 28px rgba(15, 23, 42, .07);
  --shadow-lg: 0 4px 12px rgba(15, 23, 42, .06), 0 24px 60px rgba(15, 23, 42, .14);
  --ring: 0 0 0 4px rgba(37, 99, 235, .16);
  --maxw: 1180px;
  --font: "Inter", "Segoe UI", system-ui, -apple-system, Roboto, Helvetica, Arial, sans-serif;
  --ease: cubic-bezier(.22, .61, .36, 1);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
h1, h2, h3, h4 { line-height: 1.14; letter-spacing: -.025em; margin: 0 0 .4em; }
h1 { font-size: clamp(2.1rem, 4.6vw, 3.35rem); font-weight: 800; }
h2 { font-size: clamp(1.55rem, 3vw, 2.2rem); font-weight: 800; }
h3 { font-size: 1.2rem; font-weight: 700; }
p { margin: 0 0 1em; }
a { color: var(--blue-600); text-decoration: none; transition: color .15s var(--ease); }
a:hover { text-decoration: underline; }
.muted { color: var(--muted); }
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* gradiente di testo per accenti premium */
.grad-text {
  background: var(--grad-brand); -webkit-background-clip: text;
  background-clip: text; -webkit-text-fill-color: transparent; color: transparent;
}

/* reveal d'ingresso, disattivato per chi preferisce meno movimento */
@keyframes fadeUp { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }
.reveal { opacity: 0; animation: fadeUp .7s var(--ease) forwards; }
.reveal.d1 { animation-delay: .08s; }
.reveal.d2 { animation-delay: .16s; }
.reveal.d3 { animation-delay: .24s; }
.reveal.d4 { animation-delay: .32s; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; animation: none; }
  html { scroll-behavior: auto; }
}

/* ---- NAV ---------------------------------------------------------------- */
header[data-nav] {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, .82);
  backdrop-filter: saturate(160%) blur(14px);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
  border-bottom: 1px solid rgba(15, 23, 42, .07);
}
.nav-inner {
  max-width: var(--maxw); margin: 0 auto; padding: 12px 24px;
  display: flex; align-items: center; gap: 18px;
}
.brand { display: flex; align-items: center; gap: 10px; color: var(--navy); }
.brand:hover { text-decoration: none; }
.brand-mark { color: var(--blue); font-size: 1.1rem; letter-spacing: -3px; }
.brand-text { font-size: .95rem; display: flex; align-items: center; gap: 6px; }
.brand-text b { font-weight: 800; letter-spacing: .02em; }
.brand-text i { color: var(--muted); font-style: normal; }
.brand-text span { font-weight: 700; color: var(--blue-600); }
.nav-links { margin-left: auto; display: flex; gap: 4px; flex-wrap: wrap; }
.nav-links a {
  padding: 8px 14px; border-radius: 999px; color: var(--ink);
  font-weight: 600; font-size: .92rem;
}
.nav-links a:hover { background: var(--soft); text-decoration: none; }
.nav-links a.active { background: var(--navy); color: #fff; }
.nav-toggle { display: none; margin-left: auto; background: none; border: 0; font-size: 1.5rem; cursor: pointer; color: var(--navy); }

/* ---- BUTTONS ------------------------------------------------------------ */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 13px 24px; border-radius: 999px; font-weight: 700; font-size: .95rem;
  border: 1px solid transparent; cursor: pointer;
  transition: transform .18s var(--ease), box-shadow .18s var(--ease), background .18s var(--ease);
}
.btn:hover { text-decoration: none; transform: translateY(-2px); }
.btn:focus-visible { outline: none; box-shadow: var(--ring); }
.btn-primary { background: var(--grad-brand); color: #fff; box-shadow: 0 8px 22px rgba(37, 99, 235, .34); }
.btn-primary:hover { box-shadow: 0 14px 32px rgba(37, 99, 235, .42); }
.btn-ghost { background: rgba(255, 255, 255, .9); color: var(--navy); border-color: var(--line); }
.btn-ghost:hover { border-color: var(--blue); color: var(--blue-600); box-shadow: var(--shadow-xs); }

/* ---- CARDS / GRID ------------------------------------------------------- */
.grid { display: grid; gap: 20px; }
.cols-2 { grid-template-columns: repeat(2, 1fr); }
.cols-3 { grid-template-columns: repeat(3, 1fr); }
.cols-4 { grid-template-columns: repeat(4, 1fr); }
.card {
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 24px; box-shadow: var(--shadow);
  transition: transform .22s var(--ease), box-shadow .22s var(--ease), border-color .22s var(--ease);
}
a.card, .card[href] { color: inherit; }
a.card:hover, .grid .card:hover {
  transform: translateY(-3px); box-shadow: var(--shadow-lg); border-color: #d4ddec; text-decoration: none;
}
.card h3 { margin-top: 0; }
.tag {
  display: inline-block; font-size: .72rem; font-weight: 700; letter-spacing: .05em;
  text-transform: uppercase; padding: 5px 11px; border-radius: 999px;
  background: var(--soft); color: var(--blue-600); border: 1px solid #dde6f5;
}

/* ---- KPI ---------------------------------------------------------------- */
.kpi {
  position: relative; background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 18px 20px; box-shadow: var(--shadow); overflow: hidden;
  transition: transform .22s var(--ease), box-shadow .22s var(--ease);
}
.kpi::before { content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 4px; background: var(--grad-brand); opacity: .9; }
.kpi:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); }
.kpi .kpi-label { font-size: .82rem; color: var(--muted); font-weight: 600; }
.kpi .kpi-value { font-size: 2.05rem; font-weight: 800; letter-spacing: -.035em; margin: 4px 0 2px; }
.kpi .kpi-delta { font-size: .82rem; font-weight: 700; }
.kpi .kpi-delta.up { color: var(--green); }
.kpi .kpi-delta.down { color: var(--red); }
.kpi .kpi-delta.flat { color: var(--muted); }
.kpi .kpi-note { font-size: .76rem; color: var(--muted); }

/* ---- CHART HOST --------------------------------------------------------- */
.chart-card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; box-shadow: var(--shadow); transition: box-shadow .22s var(--ease); }
.chart-card:hover { box-shadow: var(--shadow-lg); }
.chart-card .chart-title { font-weight: 700; margin-bottom: 2px; letter-spacing: -.01em; }
.chart-card .chart-sub { font-size: .82rem; color: var(--muted); margin-bottom: 12px; }
.chart-host { width: 100%; }
.uda-chart { display: block; }
.uda-grid { stroke: var(--line); stroke-width: 1; }
.uda-axis { fill: var(--muted); font-size: 12px; font-family: var(--font); }
.uda-barval { fill: var(--ink); font-size: 12px; font-weight: 700; font-family: var(--font); }
.uda-stackval { fill: #fff; font-size: 12px; font-weight: 700; font-family: var(--font); }
.uda-donut-center { fill: var(--ink); font-size: 26px; font-weight: 800; font-family: var(--font); }
.uda-donut-sub { fill: var(--muted); font-size: 12px; font-family: var(--font); }
.uda-bar { animation: growBar .6s ease both; transform-origin: bottom; }
.uda-line { stroke-dasharray: 2000; stroke-dashoffset: 2000; animation: draw 1.1s ease forwards; }
@keyframes growBar { from { transform: scaleY(0); } to { transform: scaleY(1); } }
@keyframes draw { to { stroke-dashoffset: 0; } }
.uda-legend { display: flex; flex-wrap: wrap; gap: 8px 16px; margin-top: 14px; }
.uda-legend-item { display: inline-flex; align-items: center; gap: 7px; font-size: .82rem; color: var(--ink); }
.uda-legend-item i { width: 11px; height: 11px; border-radius: 3px; display: inline-block; }

/* ---- BADGES ------------------------------------------------------------- */
.badge-synth {
  display: inline-block; margin-top: 6px; font-size: .72rem; font-weight: 700;
  padding: 3px 10px; border-radius: 999px;
  background: rgba(245, 158, 11, .15); color: #92600a; border: 1px solid rgba(245, 158, 11, .3);
}

/* ---- FOOTER ------------------------------------------------------------- */
footer[data-footer] { margin-top: 64px; background: var(--navy); color: #cdd9ec; }
.footer-inner {
  max-width: var(--maxw); margin: 0 auto; padding: 32px 24px;
  display: flex; justify-content: space-between; gap: 24px; flex-wrap: wrap; font-size: .9rem;
}
.footer-inner b { color: #fff; }
.footer-meta { text-align: right; }
.footer-meta .badge-synth { color: #ffd9a0; }

/* ---- SECTION ------------------------------------------------------------ */
.section { padding: 72px 0; }
.section-head { max-width: 760px; margin-bottom: 40px; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 9px;
  font-size: .8rem; font-weight: 800; letter-spacing: .14em; text-transform: uppercase;
  color: var(--blue-600); margin-bottom: 12px;
}
.eyebrow::before { content: ""; width: 22px; height: 2px; border-radius: 2px; background: var(--grad-brand); }

/* ---- RESPONSIVE --------------------------------------------------------- */
@media (max-width: 880px) {
  .cols-4 { grid-template-columns: repeat(2, 1fr); }
  .cols-3 { grid-template-columns: 1fr; }
  .cols-2 { grid-template-columns: 1fr; }
  .nav-toggle { display: block; }
  .nav-links {
    margin-left: 0; position: absolute; top: 100%; left: 0; right: 0;
    background: #fff; border-bottom: 1px solid var(--line); flex-direction: column;
    padding: 10px 16px; display: none;
  }
  .nav-links.open { display: flex; }
  .footer-meta { text-align: left; }
}
@media print {
  header[data-nav], footer[data-footer], .nav-toggle { display: none; }
}