/* Design: see DESIGN.md (after the Ferrari analysis on getdesign.md). Sharp corners, one red, uppercase labels,
   dark cinema bands for chrome, white spec-sheet surfaces for the tools. */
:root {
  --canvas: #ffffff;         /* tool surface (light) */
  --soft: #f7f7f7;
  --strong: #ebebeb;
  --ink: #181818;
  --body: #3d3d3d;
  --mute: #666666;
  --hair: #d2d2d2;
  --hair-soft: #ebebeb;
  --band: #181818;           /* header, hero, footer: always dark */
  --band-2: #303030;
  --band-ink: #ffffff;
  --band-body: #b4b4b4;
  --red: #da291c;            /* Rosso: primary buttons, the key result, the redline. Scarce. */
  --red-press: #b01e0a;
  --red-text: #c4200f;       /* red used as text on light surfaces (5.6:1) */
  --on-red: #ffffff;
  --ok: #02803f;             /* 5.05:1 on white (WCAG AA) */
  --on-status: #ffffff;      /* text on ok/warn/bad badges */
  --warn: #b25e00;
  --bad: #c4200f;
  --a: #181818;              /* series A in diagrams (current) */
  --b: #da291c;              /* series B in diagrams (new) */
  --c: #4c98b9;
  --focus: #f6e500;
  --shadow: 0 4px 8px rgba(0,0,0,.1);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --canvas: #181818; --soft: #202020; --strong: #303030; --ink: #ffffff; --body: #c8c8c8; --mute: #969696;
    --hair: #3a3a3a; --hair-soft: #2a2a2a; --band: #0f0f0f; --band-2: #262626; --red-text: #ff5a4b;
    --a: #ffffff; --b: #ff4a3a; --ok: #2fbf71; --warn: #f0a33a; --bad: #ff5a4b; --on-status: #181818; color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --canvas: #181818; --soft: #202020; --strong: #303030; --ink: #ffffff; --body: #c8c8c8; --mute: #969696;
  --hair: #3a3a3a; --hair-soft: #2a2a2a; --band: #0f0f0f; --band-2: #262626; --red-text: #ff5a4b;
  --a: #ffffff; --b: #ff4a3a; --ok: #2fbf71; --warn: #f0a33a; --bad: #ff5a4b; --on-status: #181818; color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--canvas); color: var(--body); font: 400 16px/1.55 var(--font); }
a { color: inherit; }
img, svg { max-width: 100%; }
h1, h2, h3 { color: var(--ink); font-weight: 500; margin: 0; }
/* Long German and French compound words: break inside words on small screens instead of overflowing. */
h1, h2, h3, p, li, label, .label, .spec .v, .spec .s, .card b, .card span, .chip, .btn, td, th, summary { overflow-wrap: break-word; }
@media (max-width: 600px) { h1, h2, h3, p, li, label, .label, .spec .s, .card b, .card span, .chip, .btn, td, th, summary { hyphens: auto; } }
.btn { white-space: normal; text-align: center; }
p { margin: 0 0 1em; }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }
.skip { position: absolute; left: -9999px; }
.skip:focus { left: 16px; top: 8px; z-index: 50; background: var(--focus); color: #000; padding: 8px 12px; }
.wrap { max-width: 1120px; margin: 0 auto; padding: 0 16px; }
.eyebrow, .label { font-size: 11px; font-weight: 600; letter-spacing: 1.1px; text-transform: uppercase; color: var(--mute); }

/* ---------- Header (dark band) ---------- */
.top { background: var(--band); color: var(--band-ink); border-bottom: 1px solid var(--band-2); position: relative; z-index: 20; }
/* Sticky header: always visible at the top (phones lost the nav mid-page) */
header.top{position:sticky;top:0;z-index:30}
@media print{header.top{position:static}}
.top .wrap { display: flex; align-items: center; gap: 16px; min-height: 60px; }
.logo { display: flex; align-items: center; gap: 10px; color: var(--band-ink); text-decoration: none; font-weight: 700;
  font-size: 17px; letter-spacing: .2px; white-space: nowrap; }
.logo svg { width: 30px; height: 30px; flex: none; }
.logo span { font-weight: 400; letter-spacing: 0; }
.logo span b { font-weight: 800; }
.nav { display: flex; gap: 2px; margin-left: auto; }
.nav a { color: var(--band-body); text-decoration: none; font-size: 12px; font-weight: 600; letter-spacing: .8px;
  text-transform: uppercase; padding: 20px 10px; border-bottom: 2px solid transparent; }
.nav a:hover, .nav a[aria-current="true"] { color: var(--band-ink); border-bottom-color: var(--red); }
.tools-bar { display: flex; align-items: center; gap: 8px; }
.seg { display: inline-flex; border: 1px solid #4a4a4a; }
.seg button { background: transparent; color: var(--band-body); border: 0; font: 600 11px/1 var(--font); letter-spacing: 1px;
  text-transform: uppercase; padding: 9px 10px; cursor: pointer; min-height: 34px; }
.seg button[aria-pressed="true"] { background: var(--band-ink); color: var(--band); }
.units-more { position: relative; }
.units-more summary { list-style: none; cursor: pointer; color: var(--band-body); border: 1px solid #4a4a4a; width: 38px; height: 36px; display: flex; align-items: center; justify-content: center; }
.units-more summary::-webkit-details-marker { display: none; }
.units-more summary svg { width: 18px; height: 18px; }
.units-more[open] summary { color: var(--band-ink); border-color: var(--band-ink); }
.units-panel { position: absolute; right: 0; top: 42px; z-index: 30; background: var(--band-2); padding: 10px 12px; box-shadow: var(--shadow); width: 290px; max-width: calc(100vw - 32px); display: grid; gap: 6px; }
.unit-row { display: flex; align-items: center; justify-content: space-between; gap: 10px; color: var(--band-ink); font-size: 13px; }
.unit-row select { background: var(--band); color: var(--band-ink); border: 1px solid #4a4a4a; font: 600 13px var(--font); padding: 6px 8px; min-width: 110px; }
@media (max-width: 420px) { .units-panel { position: fixed; left: 16px; right: 16px; top: 64px; width: auto; max-width: none; } }
.menu-btn { display: none; background: none; border: 1px solid #4a4a4a; color: var(--band-ink); width: 40px; height: 36px; cursor: pointer; }
.lang { position: relative; }
.lang summary { list-style: none; cursor: pointer; color: var(--band-body); font: 600 11px/1 var(--font); letter-spacing: 1px;
  text-transform: uppercase; border: 1px solid #4a4a4a; padding: 11px 10px; }
.lang summary::-webkit-details-marker { display: none; }
.lang ul { position: absolute; right: 0; top: 40px; margin: 0; padding: 6px 0; list-style: none; background: var(--band-2); min-width: 150px; box-shadow: var(--shadow); }
.lang a { display: block; padding: 8px 14px; color: var(--band-ink); text-decoration: none; font-size: 14px; }
.lang a:hover, .lang a[aria-current="true"] { background: #444; }
@media (max-width: 900px) {
  .menu-btn { display: inline-block; }
  .nav { display: none; position: absolute; left: 0; right: 0; top: 60px; background: var(--band); flex-direction: column;
    padding: 8px 16px 16px; border-bottom: 1px solid var(--band-2); }
  .nav.open { display: flex; }
  .nav a { padding: 12px 4px; border-bottom: 1px solid var(--band-2); }
  .tools-bar { margin-left: auto; }
}

/* ---------- Hero band ---------- */
.hero { background: var(--band); color: var(--band-ink); padding: 28px 0 30px; position: relative; }
.hero::after { content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 3px;
  background: linear-gradient(90deg, var(--red) 0 33%, transparent 33%); }
.hero h1 { color: var(--band-ink); font-size: clamp(28px, 5vw, 48px); line-height: 1.08; letter-spacing: -.8px; font-weight: 500; }
.hero .lede { color: var(--band-body); max-width: 720px; margin: 12px 0 0; font-size: 17px; }
.crumbs { font-size: 11px; font-weight: 600; letter-spacing: 1.1px; text-transform: uppercase; color: var(--band-body); margin-bottom: 10px; }
.crumbs a { color: var(--band-body); text-decoration: none; }
.crumbs a:hover { color: var(--band-ink); }

/* ---------- Tool surface ---------- */
.tool { padding: 24px 0 8px; }
.panel { border: 1px solid var(--hair); background: var(--canvas); }
.panel + .panel { margin-top: 16px; }
.panel-h { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 12px 16px;
  border-bottom: 1px solid var(--hair); background: var(--soft); }
.panel-h h2 { font-size: 13px; font-weight: 700; letter-spacing: 1.2px; text-transform: uppercase; }
.panel-b { padding: 16px; }
.grid { display: grid; gap: 16px; }
.g2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.g3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.g4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
@media (max-width: 760px) { .g2, .g3 { grid-template-columns: 1fr; } .g4 { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
.split { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: 16px; align-items: start; }
@media (max-width: 900px) { .split { grid-template-columns: 1fr; } }
.split > *, .grid > * { min-width: 0; }
/* Inside the narrow side of a split, let field grids wrap instead of squeezing values. */
.split .g3, .split .g4 { grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); }

/* Fields */
.field { display: flex; flex-direction: column; gap: 6px; min-width: 0; }
.field > label, .field > .label { font-size: 11px; font-weight: 600; letter-spacing: 1.1px; text-transform: uppercase; color: var(--mute); }
.field .hint { font-size: 13px; color: var(--mute); }
.input { display: flex; align-items: stretch; border: 1px solid var(--hair); border-radius: 4px; background: var(--canvas); min-height: 48px; }
.input:focus-within { border-color: var(--ink); box-shadow: inset 0 0 0 1px var(--ink); }
.input input, .input select { flex: 1; min-width: 0; border: 0; background: transparent; color: var(--ink);
  font: 500 18px/1.2 var(--font); padding: 12px 12px; outline: none; font-variant-numeric: tabular-nums; }
.input select { font-size: 16px; appearance: none; -webkit-appearance: none; cursor: pointer;
  background-image: linear-gradient(45deg, transparent 50%, var(--mute) 50%), linear-gradient(135deg, var(--mute) 50%, transparent 50%);
  background-position: calc(100% - 18px) 50%, calc(100% - 13px) 50%; background-size: 5px 5px; background-repeat: no-repeat; padding-right: 32px; }
.input .unit { display: flex; align-items: center; padding: 0 10px; color: var(--mute); font-size: 13px; font-weight: 600;
  letter-spacing: .5px; border-left: 1px solid var(--hair-soft); white-space: nowrap; }
.input textarea { flex: 1; min-width: 0; border: 0; background: transparent; color: var(--ink); font: 600 22px/1.35 var(--font); padding: 12px 14px; outline: none; resize: vertical; }
.input.big input { font-size: 26px; font-weight: 600; letter-spacing: -.3px; }
@media (max-width: 760px) { .g2 .input.big input, .g3 .input.big input, .g4 .input.big input { font-size: 20px; } }
.field.error .input { border-color: var(--bad); box-shadow: inset 0 0 0 1px var(--bad); }
.field .err { color: var(--bad); font-size: 13px; display: none; }
.field.error .err { display: block; }
.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chip { border: 1px solid var(--hair); background: var(--canvas); color: var(--body); font: 500 13px/1 var(--font);
  padding: 8px 10px; cursor: pointer; border-radius: 9999px; min-height: 32px; }
.chip:hover { border-color: var(--ink); color: var(--ink); }

/* Buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 44px; padding: 12px 22px;
  border: 1px solid var(--ink); background: transparent; color: var(--ink); border-radius: 0; cursor: pointer;
  font: 700 13px/1 var(--font); letter-spacing: 1.3px; text-transform: uppercase; text-decoration: none; }
.btn.primary { background: var(--red); border-color: var(--red); color: var(--on-red); }
.btn.primary:active { background: var(--red-press); }
.btn.ghost { border-color: var(--hair); color: var(--body); }
.btn.small { min-height: 34px; padding: 8px 12px; font-size: 11px; }
.row { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }

/* Results: spec cells */
.specs { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); border-top: 1px solid var(--hair); border-left: 1px solid var(--hair); }
.spec { padding: 14px 16px; border-right: 1px solid var(--hair); border-bottom: 1px solid var(--hair); min-width: 0; }
.spec .v { color: var(--ink); font-size: 28px; font-weight: 700; letter-spacing: -.6px; line-height: 1.1; font-variant-numeric: tabular-nums; overflow-wrap: anywhere; }
.spec .v small { font-size: 14px; font-weight: 600; color: var(--mute); letter-spacing: 0; margin-left: 3px; }
.spec .s { color: var(--mute); font-size: 13px; margin-top: 2px; font-variant-numeric: tabular-nums; }
.spec .label { display: block; margin-bottom: 4px; }
.spec.key .v { color: var(--red-text); }
.spec.txt .v { font-size: 21px; letter-spacing: -.2px; }
.headline { padding: 18px 16px; border: 1px solid var(--hair); border-left: 4px solid var(--red); background: var(--soft); }
.headline .v { color: var(--ink); font-size: clamp(34px, 7vw, 56px); font-weight: 700; letter-spacing: -1.2px; line-height: 1; font-variant-numeric: tabular-nums; }
.headline .v small { font-size: 18px; color: var(--mute); font-weight: 600; letter-spacing: 0; margin-left: 4px; }
.headline .t { margin-top: 8px; color: var(--body); }
.headline:empty, .specs:empty { display: none; }
.pos { color: var(--ok); } .neg { color: var(--bad); }
.note { font-size: 14px; color: var(--mute); border-left: 2px solid var(--hair); padding: 2px 0 2px 12px; margin: 12px 0 0; }
.badge { display: inline-block; font-size: 11px; font-weight: 600; letter-spacing: 1px; text-transform: uppercase;
  padding: 4px 10px; border-radius: 9999px; background: var(--strong); color: var(--ink); }
.badge.ok { background: var(--ok); color: var(--on-status); } .badge.bad { background: var(--bad); color: var(--on-status); } .badge.warn { background: var(--warn); color: var(--on-status); }

/* Tables */
.table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; border: 1px solid var(--hair); }
table.data { border-collapse: collapse; width: 100%; font-variant-numeric: tabular-nums; font-size: 15px; }
table.data th, table.data td { padding: 10px 12px; text-align: right; border-bottom: 1px solid var(--hair-soft); white-space: nowrap; }
table.data th:first-child, table.data td:first-child { text-align: left; }
table.data thead th { font-size: 11px; font-weight: 600; letter-spacing: 1px; text-transform: uppercase; color: var(--mute); background: var(--soft); border-bottom: 1px solid var(--hair); }
table.data tbody th { color: var(--ink); font-weight: 600; }
table.data td.a { color: var(--ink); } table.data td.b { color: var(--red-text); font-weight: 600; }
table.data tr.hl td, table.data tr.hl th { background: var(--soft); }

/* Diagrams */
.diagram { width: 100%; height: auto; display: block; }
.diagram text { font-family: var(--font); fill: var(--mute); font-size: 17px; }
.diagram .dim { stroke: var(--mute); stroke-width: 1; }
.legend { display: flex; gap: 16px; flex-wrap: wrap; font-size: 13px; color: var(--mute); margin-top: 8px; }
.legend i { display: inline-block; width: 18px; height: 3px; vertical-align: middle; margin-right: 6px; }

/* ---------- Content ---------- */
.content { padding: 24px 0 40px; }
.content .wrap > * { max-width: 760px; }
.content h2 { font-size: 26px; letter-spacing: -.2px; margin: 36px 0 12px; }
.content h3 { font-size: 18px; font-weight: 700; margin: 24px 0 8px; }
.content ul, .content ol { padding-left: 1.2em; }
.content li { margin: 4px 0; }
.content code, .formula { font-family: var(--mono); font-size: 14px; background: var(--soft); border: 1px solid var(--hair-soft); padding: 1px 6px; }
.formula { display: block; padding: 12px 14px; margin: 8px 0 16px; overflow-x: auto; white-space: pre; color: var(--ink); }
.content .table-wrap { margin: 12px 0 20px; }
.faq details { border-bottom: 1px solid var(--hair); padding: 14px 0; }
.faq summary { cursor: pointer; color: var(--ink); font-weight: 600; font-size: 17px; }
.faq details p { margin: 10px 0 0; }
.related { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 0; border-top: 1px solid var(--hair); border-left: 1px solid var(--hair); margin-top: 12px; max-width: none !important; }
.related a { display: block; padding: 14px 16px; border-right: 1px solid var(--hair); border-bottom: 1px solid var(--hair); text-decoration: none; color: var(--ink); font-weight: 600; }
.related a span { display: block; font-weight: 400; color: var(--mute); font-size: 14px; margin-top: 2px; }
.related a:hover { background: var(--soft); }

/* ---------- Hub ---------- */
.hub-section { padding: 28px 0 8px; }
.hub-section h2 { font-size: 13px; font-weight: 700; letter-spacing: 1.4px; text-transform: uppercase; margin-bottom: 12px; display: flex; align-items: center; gap: 10px; }
.hub-section h2::before { content: ""; width: 18px; height: 3px; background: var(--red); }
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); border-top: 1px solid var(--hair); border-left: 1px solid var(--hair); }
.card { display: block; padding: 18px 16px 20px; border-right: 1px solid var(--hair); border-bottom: 1px solid var(--hair); text-decoration: none; color: var(--body); background: var(--canvas); }
.card:hover { background: var(--soft); }
.card b { display: block; color: var(--ink); font-size: 17px; font-weight: 600; margin-bottom: 4px; }
.card span { font-size: 14px; color: var(--mute); }

/* ---------- Footer (dark band) ---------- */
.foot { background: var(--band); color: var(--band-body); padding: 40px 0 28px; margin-top: 24px; font-size: 14px; }
.foot a { color: var(--band-body); text-decoration: none; }
.foot a:hover { color: var(--band-ink); }
.foot-cols { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 24px; }
.foot h3 { color: var(--band-ink); font-size: 11px; font-weight: 600; letter-spacing: 1.2px; text-transform: uppercase; margin-bottom: 10px; }
.foot ul { list-style: none; margin: 0; padding: 0; }
.foot li { margin: 6px 0; }
.foot .fine { border-top: 1px solid var(--band-2); margin-top: 28px; padding-top: 16px; font-size: 13px; }

@media print {
  .top, .foot, .hero::after, .btn, .chips, .lang, .menu-btn { display: none !important; }
  .hero { background: none; color: #000; } .hero h1 { color: #000; }
}

/* Hub: section jump links and subheadings for long sections */
.hub-jump { padding-top: 20px; }
.hub-jump .chip { text-decoration: none; }
.hub-jump .chip span { color: var(--mute); margin-left: 4px; }
.hub-sub { font-size: 16px; font-weight: 700; margin: 20px 0 10px; color: var(--ink); }
.hub-section { scroll-margin-top: 16px; }
/* Compact footer */
.foot h3 a { color: inherit; text-decoration: none; }
.foot .fmore a { color: var(--band-ink); font-weight: 600; }
.foot .finfo { color: var(--band-ink); }

/* Small phones: the header holds logo, US/Metric, Units, language and menu; keep the logo icon only. */
@media (max-width: 440px) {
  .logo span { display: none; }
  .top .wrap { gap: 8px; }
  .seg button { padding: 9px 8px; }
}

/* Cookie notice (GA4 runs only after Accept) */
.consent { position: fixed; left: 16px; right: 16px; bottom: 16px; z-index: 60; max-width: 560px; margin: 0 auto;
  background: var(--canvas); color: var(--ink); border: 1px solid var(--hair); border-left: 4px solid var(--red); padding: 16px; box-shadow: 0 10px 30px rgba(0,0,0,.25); }
.consent[hidden] { display: none !important; }
.consent p { margin: 0 0 12px; font-size: 14px; color: var(--body); }
.consent p b { color: var(--ink); }
.consent-btns { justify-content: flex-end; }
/* text tables (VIN pages): wrap and left-align every cell */
table.data.vt th, table.data.vt td { white-space: normal; text-align: left; overflow-wrap: anywhere; }
table.data.vt th { overflow-wrap: normal; }
table.data.vt tbody th:first-child { white-space: nowrap; }