/*
  Track tools: shared styles for /tools and /it/strumenti.

  The tokens are the homepage's (index.html <style>), so the tools read as the
  same site. Keep them in step when the homepage palette changes.
*/
:root {
  --paper: #FAFAF9;
  --paper-3: #F2F2F0;
  --card: #FFFFFF;
  --card-2: #F2F2F0;
  --cell: #F6F1EC;
  --key: #FFFFFF;
  --ink: #0C0B0A;
  --ink-2: #524C46;
  --ink-3: #6F655E;
  --ink-4: #998D82;
  --rule: #E9DED6;
  --edge: rgba(12,11,10,.07);
  --edge-2: rgba(12,11,10,.14);
  --rim: rgba(122,84,56,.09);
  --control-edge: #E9DED6;
  --lip: #EBE4DC;
  --lip-key: #E6DDD4;
  --raise-card: 0 3px 0 var(--lip), 0 8px 22px rgba(12,11,10,.07);
  --raise-key: 0 3px 0 var(--lip-key);
  --raise-chip: 0 2px 0 var(--lip);
  --accent: #DB2412;
  --accent-fill: #DB2412;
  --accent-hover: #C9200F;
  --red-lip: #A8231C;
  --raise-red: 0 5px 0 var(--red-lip), 0 10px 22px rgba(219,36,18,.22);
  --accent-soft: #FDE5DF;
  --moss: #4F6B3A;
  --cta-bg: #DB2412;
  --cta-lip: #A8231C;
  --cta-ink: #FFFFFF;
  --cta-ink-2: #FDE5DF;
  --header-bg: rgba(250,250,249,.86);
  --r-card: 28px;
  --r-panel: 20px;
  --r-ctrl: 14px;
  --sans: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --press: .08s ease-out;
  --release: .32s cubic-bezier(.34,1.32,.64,1);
  --gutter: 32px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --paper: #000000;
    --paper-3: #0E0D0C;
    --card: #1C1A18;
    --card-2: #2A2724;
    --cell: #2A2724;
    --key: #2A2724;
    --ink: #F7F0E7;
    --ink-2: #DCD1C3;
    --ink-3: #B5A999;
    --ink-4: #877B6D;
    --rule: #3A3530;
    --edge: rgba(255,247,235,.10);
    --edge-2: rgba(255,247,235,.18);
    --rim: rgba(255,247,235,.10);
    --control-edge: rgba(255,247,235,.12);
    --lip: #2C2824;
    --lip-key: #3D3833;
    --raise-card: 0 3px 0 var(--lip), inset 0 1px 0 rgba(255,247,235,.05);
    --raise-key: 0 3px 0 var(--lip-key);
    --raise-chip: 0 2px 0 var(--lip-key);
    --accent: #F2463A;
    --red-lip: #8C1A10;
    --raise-red: 0 5px 0 var(--red-lip), 0 10px 22px rgba(219,36,18,.18), inset 0 1px 0 rgba(255,255,255,.12);
    --cta-lip: #8C1A10;
    --accent-soft: #40231D;
    --moss: #8CBD72;
    --header-bg: rgba(0,0,0,.82);
  }
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--paper); color: var(--ink);
  font-family: var(--sans); font-size: 16px; line-height: 1.6;
  -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
h1, h2, h3, p { margin: 0; }
[hidden] { display: none !important; }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible {
  outline: 3px solid var(--accent); outline-offset: 2px;
}
.wrap { width: 100%; max-width: 1040px; margin: 0 auto; padding: 0 var(--gutter); }
.num, input, output, td, th { font-variant-numeric: tabular-nums; }
.eyebrow { font-size: 12px; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; color: var(--accent); }

/* ---------- Header and footer (as on the homepage) ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50; background: var(--header-bg);
  backdrop-filter: saturate(140%) blur(14px); -webkit-backdrop-filter: saturate(140%) blur(14px);
  border-bottom: 1px solid var(--edge);
}
.nav { display: flex; align-items: center; justify-content: space-between; gap: 16px; height: 72px; }
.brand img { height: 28px; width: auto; }
.lockup-dark { display: none; }
@media (prefers-color-scheme: dark) { .lockup-light { display: none; } .lockup-dark { display: block; } }
.nav-actions { display: flex; align-items: center; gap: 6px; }
.nav-link { display: inline-flex; align-items: center; min-height: 44px; padding: 0 10px; font-size: 15px; font-weight: 600; color: var(--ink-2); }
.nav-link:hover { color: var(--ink); }
/* Language menu: a globe that opens the list of languages. */
.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; }
.lang-menu { position: relative; }
.lang-menu summary { list-style: none; display: inline-flex; align-items: center; justify-content: center; width: 44px; height: 44px; border-radius: 13px; color: var(--ink-2); cursor: pointer; }
.lang-menu summary::-webkit-details-marker { display: none; }
.lang-menu summary:hover, .lang-menu[open] summary { color: var(--ink); background: var(--card-2); }
.lang-menu summary:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }
.lang-list { position: absolute; right: 0; top: calc(100% + 8px); z-index: 60; display: grid; gap: 2px; min-width: 176px; padding: 6px; background: var(--card); border: 1px solid var(--rim); border-radius: 18px; box-shadow: var(--raise-card); }
.lang-list a { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 10px 12px; border-radius: 10px; font-size: 15px; font-weight: 600; color: var(--ink-2); }
.lang-list a:hover { color: var(--ink); background: var(--card-2); }
.lang-list a[aria-current] { color: var(--ink); }
.lang-list a[aria-current]::after { content: "✓"; color: var(--accent); font-weight: 700; }
/* Pressable, as on the homepage: the face sinks onto its lip while pressed. */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  min-height: 54px; padding: 0 28px; border-radius: 999px; font-size: 17px; font-weight: 700;
  white-space: nowrap; transition: transform var(--release), box-shadow var(--release), background .2s ease;
}
.btn:active { transition: transform var(--press), box-shadow var(--press); }
.btn-red { background: var(--accent-fill); color: #FFFFFF; box-shadow: var(--raise-red); }
.btn-red:hover { background: var(--accent-hover); }
.btn-red:active { transform: translateY(4px); box-shadow: 0 1px 0 var(--red-lip), 0 4px 10px rgba(219,36,18,.18); }
.btn-small { min-height: 44px; padding: 0 20px; font-size: 15px; }
.btn-small.btn-red { box-shadow: 0 3px 0 var(--red-lip), 0 6px 14px rgba(219,36,18,.2); }
.btn-small.btn-red:active { transform: translateY(2px); box-shadow: 0 1px 0 var(--red-lip); }
.btn-on-dark { color: #FFFFFF; background: rgba(255,255,255,.16); box-shadow: 0 5px 0 rgba(90,10,4,.32); }
.btn-on-dark:hover { background: rgba(255,255,255,.22); }
.btn-on-dark:active { transform: translateY(4px); box-shadow: 0 1px 0 rgba(90,10,4,.32); }
.btn-row { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 28px; }

.site-footer { border-top: 1px solid var(--edge); padding: 40px 0 56px; margin-top: 24px; }
.footer-grid { display: flex; justify-content: space-between; align-items: center; gap: 20px; flex-wrap: wrap; }
.footer-grid .brand img { height: 22px; }
.footer-links, .lang-links { display: flex; flex-wrap: wrap; gap: 8px 22px; font-size: 14px; font-weight: 600; color: var(--ink-3); }
.footer-links a:hover, .lang-links a:hover, .lang-links a[aria-current] { color: var(--ink); }
.copyright { width: 100%; font-size: 13px; color: var(--ink-3); }

/* ---------- Page head ---------- */
.crumbs { padding-top: 28px; font-size: 14px; font-weight: 600; color: var(--ink-3); }
.crumbs a:hover { color: var(--ink); }
.crumbs span[aria-hidden] { margin: 0 6px; color: var(--ink-4); }
.page-head { padding: 20px 0 32px; max-width: 46em; }
.page-head h1 { font-size: clamp(34px, 5vw, 50px); font-weight: 800; letter-spacing: -0.035em; line-height: 1.06; margin-top: 12px; }
.page-head .lead { font-size: 19px; color: var(--ink-2); margin-top: 16px; }

/* ---------- The tool ---------- */
.tool {
  background: var(--card); border: 1px solid var(--rim); border-radius: var(--r-card);
  box-shadow: var(--raise-card); padding: 28px; display: grid; gap: 28px;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
}
.tool + .tool, .prose + .tool { margin-top: 24px; }
.tool.stack { grid-template-columns: minmax(0, 1fr); }
.tool.stack .tool-inputs { grid-template-columns: minmax(0, 3fr) minmax(0, 2fr); column-gap: 28px; }
.tool.stack .tool-inputs > .full { grid-column: 1 / -1; }
.tool-inputs { display: grid; gap: 18px; align-content: start; }
.tool-results { display: grid; gap: 18px; align-content: start; min-width: 0; }
.field { display: grid; gap: 6px; align-content: start; }
.field > label, .field > .label, fieldset > legend {
  font-size: 13px; font-weight: 700; color: var(--ink-2); letter-spacing: .01em; padding: 0;
}
.field .hint { font-size: 13px; color: var(--ink-3); }
.col { display: grid; gap: 12px; align-content: start; min-width: 0; }
.align-start { align-content: start; }
.row { display: grid; gap: 12px; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); }
fieldset { border: 0; margin: 0; padding: 0; min-width: 0; display: grid; gap: 6px; }
input[type=text], input[type=number], select, textarea {
  width: 100%; min-height: 48px; padding: 10px 14px; border-radius: var(--r-ctrl);
  border: 1px solid var(--control-edge); background: var(--key); color: var(--ink);
  box-shadow: var(--raise-chip);
  font: inherit; font-size: 17px; font-weight: 600;
}
textarea { resize: vertical; min-height: 76px; line-height: 1.45; }
select { appearance: none; -webkit-appearance: none; padding-right: 38px;
  background-image: linear-gradient(45deg, transparent 50%, var(--ink-3) 50%), linear-gradient(135deg, var(--ink-3) 50%, transparent 50%);
  background-position: calc(100% - 20px) 50%, calc(100% - 15px) 50%; background-size: 5px 5px; background-repeat: no-repeat; }
input::placeholder, textarea::placeholder { color: var(--ink-4); font-weight: 500; }
input[aria-invalid=true], textarea[aria-invalid=true] { border-color: var(--accent); }

/* Segmented choice built from radio inputs. */
.seg { display: flex; flex-wrap: wrap; gap: 4px; padding: 4px; background: var(--cell); border-radius: var(--r-ctrl); border: 1px solid var(--control-edge); }
.seg label { flex: 1 1 auto; position: relative; }
.seg input { position: absolute; opacity: 0; inset: 0; margin: 0; cursor: pointer; }
.seg span { display: block; text-align: center; padding: 9px 12px; border-radius: 10px; font-size: 15px; font-weight: 600; color: var(--ink-2); white-space: nowrap; }
/* The selected segment is the app's thumb: solid brand red, white label, on a red lip. */
.seg input:checked + span { background: #DB2412; color: #FFFFFF; box-shadow: 0 2px 0 var(--red-lip); }
.seg input:focus-visible + span { outline: 3px solid var(--accent); outline-offset: 1px; }

/* Example chips that fill the inputs. */
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip { font: inherit; font-size: 14px; font-weight: 600; color: var(--ink-2); background: var(--key); border: 1px solid var(--control-edge); border-radius: 999px; padding: 6px 13px; cursor: pointer; box-shadow: var(--raise-chip); transition: transform var(--release), box-shadow var(--release); }
.chip:hover { color: var(--ink); }
.chip:active { transform: translateY(2px); box-shadow: 0 0 0 var(--lip); transition: transform var(--press), box-shadow var(--press); }

/* Results. */
.stats { display: grid; gap: 10px; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); }
.stat { background: var(--cell); border-radius: var(--r-panel); padding: 14px 16px; min-width: 0; }
.stat .k { font-size: 12px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--ink-3); }
.stat .v { display: block; font-size: 28px; white-space: nowrap; font-weight: 800; letter-spacing: -0.02em; line-height: 1.15; margin-top: 4px; overflow-wrap: anywhere; }
.stat .s { font-size: 13px; color: var(--ink-3); margin-top: 2px; }
.stat.hero { background: var(--accent-soft); }
.stat.hero .v { color: var(--accent); }
.hint { font-size: 13px; color: var(--ink-3); }
.note { font-size: 14px; color: var(--ink-3); }
.warn { font-size: 14px; color: var(--ink-2); background: var(--card-2); border-left: 3px solid var(--accent); border-radius: 8px; padding: 10px 12px; }
.error { font-size: 14px; color: var(--accent); font-weight: 600; }

.table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; border-radius: var(--r-panel); border: 1px solid var(--edge); }
table { width: 100%; border-collapse: collapse; font-size: 15px; }
th, td { text-align: right; padding: 9px 12px; white-space: nowrap; }
th:first-child, td:first-child { text-align: left; }
thead th { font-size: 12px; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; color: var(--ink-3); background: var(--card-2); }
tbody tr + tr td { border-top: 1px solid var(--edge); }
tbody td:first-child { font-weight: 700; }
td.hl, th.hl { color: var(--accent); font-weight: 800; }

/* ---------- Article sections ---------- */
.prose { max-width: 46em; padding-top: 56px; }
.prose h2 { font-size: clamp(24px, 3vw, 30px); font-weight: 800; letter-spacing: -0.025em; line-height: 1.15; }
.prose h2:not(:first-child) { margin-top: 44px; }
.prose h3 { font-size: 18px; font-weight: 700; margin-top: 22px; }
.prose p, .prose li { color: var(--ink-2); font-size: 17px; }
.prose p { margin-top: 14px; }
.prose ul, .prose ol { padding-left: 22px; margin: 14px 0 0; }
.prose li { margin: 6px 0; }
.prose a { color: var(--accent); font-weight: 600; }
.prose a:hover { text-decoration: underline; }
.prose .table-wrap { margin-top: 18px; }
.formula { margin-top: 16px; padding: 16px 18px; background: var(--cell); border-radius: var(--r-panel); font-size: 17px; font-weight: 600; color: var(--ink); overflow-x: auto; }
.formula code, .prose code { font-family: ui-monospace, "SF Mono", Menlo, monospace; font-size: .92em; }
.sources { font-size: 14px !important; color: var(--ink-3) !important; }

.faq { max-width: 46em; padding-top: 56px; }
.faq h2 { font-size: clamp(24px, 3vw, 30px); font-weight: 800; letter-spacing: -0.025em; }
.faq details { border-top: 1px solid var(--edge); padding: 16px 0; }
.faq details:last-of-type { border-bottom: 1px solid var(--edge); }
.faq summary { cursor: pointer; font-size: 17px; font-weight: 700; list-style: none; display: flex; justify-content: space-between; gap: 16px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; color: var(--ink-3); font-weight: 600; }
.faq details[open] summary::after { content: "–"; }
.faq details p { color: var(--ink-2); font-size: 16.5px; margin-top: 10px; }
.faq h2 + details { margin-top: 18px; }

/* ---------- App call to action ---------- */
/* Drawn as the app's red Log card, like the homepage's final call to action. */
.app-cta { margin-top: 64px; background: var(--cta-bg); box-shadow: 0 6px 0 var(--cta-lip), 0 18px 40px rgba(219,36,18,.22); border-radius: var(--r-card); padding: 40px; display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 28px; align-items: center; }
.app-cta img { width: 72px; height: 72px; border-radius: 16px; }
.app-cta h2 { color: var(--cta-ink); font-size: clamp(24px, 3vw, 32px); font-weight: 800; letter-spacing: -0.03em; line-height: 1.12; }
.app-cta p { color: var(--cta-ink-2); font-size: 17px; margin-top: 10px; max-width: 36em; }
.app-cta .btn-row { margin-top: 22px; }
.app-cta .btn-red { background: #FFFFFF; color: #DB2412; box-shadow: 0 5px 0 rgba(90,10,4,.4); }
.app-cta .btn-red:hover { background: #FFF5F3; }
.app-cta .btn-red:active { transform: translateY(4px); box-shadow: 0 1px 0 rgba(90,10,4,.4); }

/* ---------- Related tools and the hub ---------- */
.related { padding-top: 56px; }
.related h2, .hub-group h2 { font-size: 22px; font-weight: 800; letter-spacing: -0.02em; }
.cards { display: grid; gap: 14px; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); margin-top: 18px; }
.tcard { display: block; background: var(--card); border: 1px solid var(--rim); border-radius: var(--r-panel); padding: 20px 22px; box-shadow: var(--raise-card); transition: transform var(--release), box-shadow var(--release); }
.tcard:active { transform: translateY(3px); box-shadow: 0 0 0 var(--lip); transition: transform var(--press), box-shadow var(--press); }
.tcard h3 { font-size: 18px; font-weight: 700; letter-spacing: -0.01em; }
.tcard p { font-size: 15px; color: var(--ink-2); margin-top: 6px; }
.tcard .eg { display: block; font-size: 13px; font-weight: 600; color: var(--ink-3); margin-top: 12px; }
.hub-group { padding-top: 44px; }
.hub-group.first { padding-top: 8px; }
.page-head.hub-head { padding-top: 48px; }
.hub-group > p { color: var(--ink-2); margin-top: 6px; max-width: 40em; }

@media (max-width: 980px) {
  .tool, .tool.stack .tool-inputs { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 640px) {
  :root { --gutter: 16px; }
  .tool { padding: 20px 16px; border-radius: 22px; }
  .nav-link.hide-sm { display: none; }
  .app-cta { grid-template-columns: minmax(0, 1fr); padding: 28px 22px; }
  .stat .v { font-size: 24px; }
  th, td { padding: 8px 10px; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
  .btn:active, .chip:active, .tcard:active { transform: none !important; }
}