/* =========================================================================
   statelinecalc.com — design system
   Implements CHARTE-GRAPHIQUE-ET-ACCUEIL.md verbatim.
   Contrast ratios were computed 2026-08-21 with the WCAG 2.1 relative
   luminance formula — do not substitute colours without recomputing.
   No external font. No external asset. Zero blocking requests.
   ========================================================================= */

:root {
  /* --- colour, section 3 --- */
  --text-primary:   #0F172A;  /* 17.85:1 on white — AAA */
  --text-secondary: #475569;  /*  7.58:1 — AAA */
  --text-muted:     #64748B;  /*  4.76:1 — AA  */
  --accent:         #1D4ED8;  /*  6.70:1 — AA  */
  --on-accent:      #FFFFFF;
  --success:        #047857;  /*  5.48:1 — AA  */
  --on-success:     #FFFFFF;
  --danger:         #B91C1C;  /*  6.47:1 — AA  */
  --warning-bg:     #FFFEF7;
  --warning-text:   #92400E;  /*  7.01:1 on --warning-bg — AAA */
  --surface:        #F8FAFC;
  --dark:           #0F172A;
  --on-dark:        #F1F5F9;  /* 16.30:1 — AAA */
  --border-strong:  #64748B;  /* 4.76:1 — functional borders only */
  --border-subtle:  #CBD5E1;  /* decorative separators ONLY, never a field */

  /* --- type, section 4 --- */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
               "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas,
               "Liberation Mono", monospace;
  --measure: 68ch;

  /* --- spacing, 4px scale, section 5 --- */
  --s-1: 4px;  --s-2: 8px;  --s-3: 12px; --s-4: 16px;
  --s-6: 24px; --s-8: 32px; --s-12: 48px; --s-16: 64px;

  --radius-sm: 4px;
  --radius-md: 8px;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, .06);
  --shadow-md: 0 4px 12px rgba(15, 23, 42, .08);

  --content-max: 1120px;
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;          /* never smaller — section 4.3 */
  line-height: 1.65;
  color: var(--text-primary);
  background: #FFFFFF;
}

/* Numbers are the product. Tabular figures stop the layout from twitching
   as a value recalculates — this is CLS prevention, not decoration. */
.num { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }

/* ---------- layout ---------- */
.wrap {
  max-width: var(--content-max);
  margin-inline: auto;
  padding-inline: var(--s-4);
}
@media (min-width: 768px)  { .wrap { padding-inline: var(--s-6); } }
@media (min-width: 1024px) { .wrap { padding-inline: var(--s-8); } }

.prose { max-width: var(--measure); }

/* ---------- type scale, section 4.3 ---------- */
h1 { font-size: 28px; font-weight: 700; line-height: 1.2; margin: 0 0 var(--s-4); }
@media (min-width: 768px) { h1 { font-size: 32px; } }
h2 { font-size: 24px; font-weight: 600; line-height: 1.3; margin: var(--s-12) 0 var(--s-4); }
h3 { font-size: 18px; font-weight: 600; line-height: 1.4; margin: var(--s-8) 0 var(--s-2); }
p  { margin: 0 0 var(--s-4); }
small, .caption { font-size: 14px; line-height: 1.5; color: var(--text-muted); }
.micro { font-size: 12px; line-height: 1.5; color: var(--text-muted); }

a { color: var(--accent); text-underline-offset: 2px; }
a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* ---------- header / footer ---------- */
.site-header {
  border-bottom: 1px solid var(--border-subtle);
  padding-block: var(--s-4);
}
.site-header .wrap { display: flex; align-items: center; gap: var(--s-6); flex-wrap: wrap; }
.brand { font-weight: 700; font-size: 18px; color: var(--text-primary); text-decoration: none; }
.site-nav { display: flex; gap: var(--s-4); flex-wrap: wrap; font-size: 15px; }

.site-footer {
  margin-top: var(--s-16);
  background: var(--dark);
  color: var(--on-dark);
  padding-block: var(--s-12);
}
.site-footer a { color: var(--on-dark); }

/* Breadcrumb */
.crumbs { font-size: 14px; color: var(--text-muted); margin: var(--s-4) 0; }
.crumbs ol { list-style: none; display: flex; flex-wrap: wrap; gap: var(--s-2); margin: 0; padding: 0; }
.crumbs li::after { content: "/"; margin-left: var(--s-2); color: var(--border-subtle); }
.crumbs li:last-child::after { content: ""; }

/* ---------- the 40-60 word answer block, gabarit item 2 ---------- */
.answer {
  background: var(--surface);
  border-left: 4px solid var(--accent);
  border-radius: var(--radius-sm);
  padding: var(--s-4) var(--s-6);
  margin-bottom: var(--s-8);
  font-size: 17px;
}
.answer p:last-child { margin-bottom: 0; }

/* ---------- form, section 6.1 ---------- */
.calc {
  background: var(--surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: var(--s-6);
  box-shadow: var(--shadow-sm);
}
.field { margin-bottom: var(--s-6); }
.field label {           /* visible label, never a bare placeholder */
  display: block;
  font-weight: 600;
  margin-bottom: var(--s-2);
}
.field input, .field select {
  width: 100%;
  min-height: 48px;      /* touch target */
  padding: var(--s-2) var(--s-3);
  font: inherit;
  color: var(--text-primary);
  background: #FFFFFF;
  border: 1px solid var(--border-strong);   /* functional border, >= 3:1 */
  border-radius: var(--radius-sm);
}
.field .help {           /* persistent helper text, not a placeholder */
  display: block;
  font-size: 14px;
  color: var(--text-secondary);
  margin-top: var(--s-1);
}
.field .error {
  display: none;
  align-items: center;
  gap: var(--s-1);
  font-size: 14px;
  color: var(--danger);
  margin-top: var(--s-1);
}
.field.is-invalid .error { display: flex; }
.field.is-invalid input { border-color: var(--danger); border-width: 2px; }

.row { display: grid; gap: var(--s-4); }
@media (min-width: 768px) { .row-2 { grid-template-columns: 1fr 1fr; } }

.checkline { display: flex; align-items: flex-start; gap: var(--s-2); }
.checkline input { width: 20px; min-height: 20px; margin-top: 3px; flex: none; }

/* ---------- button, section 6.2 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 48px; padding-inline: var(--s-6);
  font: inherit; font-weight: 600;
  border: 1px solid transparent; border-radius: var(--radius-md);
  cursor: pointer;
  transition: background-color 150ms ease;   /* colour only — never layout */
}
.btn-primary { background: var(--accent); color: var(--on-accent); }
.btn-primary:hover { background: #1A45BE; }

/* ---------- result block, section 6.3 ---------- */
/* Minimum height is reserved even when empty so the first calculation
   cannot shift the page. */
.result {
  margin-top: var(--s-8);
  min-height: 320px;
  background: #FFFFFF;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  padding: var(--s-6);
}
.result-label { font-size: 14px; color: var(--text-muted); text-transform: uppercase; letter-spacing: .04em; }
.result-head {
  font-size: 40px; line-height: 1.1; font-weight: 700;
  color: var(--success);
  margin: var(--s-1) 0 var(--s-4);
}
.result hr { border: 0; border-top: 1px solid var(--border-subtle); margin: var(--s-4) 0; }
.line { display: flex; justify-content: space-between; gap: var(--s-4); padding: var(--s-1) 0; }
.line dt { color: var(--text-secondary); }
.line dd { margin: 0; text-align: right; }
.line-total { font-weight: 700; color: var(--text-primary); }

/* ---------- 14-bracket table, section 6.4 ---------- */
/* The table is the server-rendered, crawlable version of the calculator.
   AI crawlers do not run JavaScript — without this table the tool is
   invisible to them. This is the most important markup on the page. */
.table-scroll { overflow-x: auto; }        /* never scroll the whole page */
table { border-collapse: collapse; width: 100%; font-size: 15px; }
th, td { padding: var(--s-2) var(--s-3); text-align: right; border-bottom: 1px solid var(--border-subtle); }
th:first-child, td:first-child { text-align: left; }
thead th { background: var(--surface); font-weight: 600; white-space: nowrap; }
tbody tr:nth-child(odd) { background: var(--surface); }

/* ---------- ad slots, section 7 ---------- */
/* Height is reserved in CSS before anything loads. An unreserved ad slot is
   the number one cause of CLS on a monetised site. */
.ad-slot { display: block; margin: var(--s-8) auto; background: var(--surface); overflow: hidden; }
.ad-leaderboard { min-height: 90px; }
.ad-rectangle   { min-height: 250px; }
.ad-mobile      { min-height: 100px; }
@media (max-width: 767px) { .ad-leaderboard { min-height: 100px; } }

/* ---------- misc blocks ---------- */
.callout {
  background: var(--warning-bg);
  border: 1px solid #E7D9B0;
  border-radius: var(--radius-sm);
  color: var(--warning-text);
  padding: var(--s-4);
  margin: var(--s-6) 0;
}
.dates { font-size: 14px; color: var(--text-muted); margin-top: var(--s-8); }
.disclaimer { font-size: 12px; color: var(--text-muted); border-top: 1px solid var(--border-subtle); padding-top: var(--s-4); margin-top: var(--s-8); }

.linkgrid { list-style: none; margin: 0; padding: 0; display: grid; gap: var(--s-2); }
@media (min-width: 640px)  { .linkgrid { grid-template-columns: repeat(3, 1fr); } }
@media (min-width: 1024px) { .linkgrid { grid-template-columns: repeat(5, 1fr); } }

.faq h3 { margin-bottom: var(--s-1); }

/* ---------- utilities ----------
   These exist so no element needs a style="" attribute. The site ships a
   strict Content-Security-Policy without 'unsafe-inline', which blocks
   inline style attributes outright — so a stray style="" is not a matter of
   taste here, it is a rendering bug. */
.u-mt-0      { margin-top: 0; }
.u-m-0       { margin: 0; }
.u-mt-3      { margin-top: var(--s-3); }
.u-fw-normal { font-weight: 400; }
.u-on-dark   { color: var(--on-dark); }
.caption-left { text-align: left; padding-bottom: var(--s-2); }
.result-unit { font-size: 20px; font-weight: 400; }