/* ==========================================================
   Guide adoucisseur d'eau – feuille de style
   ========================================================== */

:root {
  --c-primary: #0b6e99;
  --c-primary-dark: #084f6f;
  --c-accent: #e8f4fa;
  --c-text: #1d2a33;
  --c-muted: #5b6b76;
  --c-border: #d5e0e6;
  --c-bg: #ffffff;
  --c-bg-alt: #f5f9fb;
  --radius: 10px;
  --max: 820px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

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

html { scroll-behavior: smooth; scroll-padding-top: 76px; }

body {
  margin: 0;
  font-family: var(--font);
  font-size: 1.0625rem;
  line-height: 1.7;
  color: var(--c-text);
  background: var(--c-bg);
  -webkit-font-smoothing: antialiased;
}

.wrap {
  width: 100%;
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 20px;
}

/* ---------- Accessibilité ---------- */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--c-primary-dark);
  color: #fff;
  padding: 10px 16px;
  z-index: 100;
}
.skip-link:focus { left: 10px; top: 10px; }

a { color: var(--c-primary); text-underline-offset: 3px; }
a:hover { color: var(--c-primary-dark); }
a:focus-visible,
.btn:focus-visible {
  outline: 3px solid #f2a900;
  outline-offset: 2px;
  border-radius: 3px;
}

/* ---------- En-tête ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--c-primary);
  color: #fff;
  box-shadow: 0 2px 6px rgba(0, 0, 0, .12);
}
.header-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 6px 24px;
  padding-top: 10px;
  padding-bottom: 10px;
}
.site-title { margin: 0; font-weight: 700; font-size: 1.05rem; }
.main-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 18px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: .92rem;
}
.main-nav a { color: #fff; text-decoration: none; padding: 4px 0; }
.main-nav a:hover { text-decoration: underline; }

/* ---------- Fil d'Ariane ---------- */
.breadcrumb {
  margin: 22px 0 8px;
  font-size: .88rem;
  color: var(--c-muted);
}
.breadcrumb a { color: var(--c-muted); }

/* ---------- Titres ---------- */
.article-head { padding-bottom: 10px; }
.kicker {
  margin: 0 0 6px;
  text-transform: uppercase;
  letter-spacing: .08em;
  font-size: .78rem;
  font-weight: 700;
  color: var(--c-primary);
}
h1 {
  margin: 0 0 14px;
  font-size: clamp(1.7rem, 4.5vw, 2.4rem);
  line-height: 1.2;
}
h2 {
  margin: 0 0 14px;
  font-size: clamp(1.35rem, 3.2vw, 1.7rem);
  line-height: 1.3;
  color: var(--c-primary-dark);
}
h3 { margin: 26px 0 6px; font-size: 1.1rem; line-height: 1.4; }

.lead { font-size: 1.2rem; color: #33444f; margin: 0 0 12px; }
.meta { font-size: .88rem; color: var(--c-muted); margin: 0; }

section { margin: 44px 0; }
p { margin: 0 0 1em; }

/* ---------- Sommaire ---------- */
.toc {
  background: var(--c-bg-alt);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 18px 24px;
  margin: 26px 0;
}
.toc h2 { margin: 0 0 8px; font-size: 1.05rem; color: var(--c-text); }
.toc ol { margin: 0; padding-left: 1.2em; columns: 2; column-gap: 32px; }
.toc li { break-inside: avoid; padding: 2px 0; }

/* ---------- Encadré ---------- */
.callout {
  background: var(--c-accent);
  border-left: 4px solid var(--c-primary);
  padding: 14px 18px;
  border-radius: 0 var(--radius) var(--radius) 0;
}

/* ---------- Tableaux ---------- */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 22px 0;
  font-size: .95rem;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  overflow: hidden;
}
caption {
  caption-side: top;
  text-align: left;
  font-weight: 700;
  padding: 0 0 8px;
  color: var(--c-muted);
  font-size: .92rem;
}
th, td {
  padding: 10px 12px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--c-border);
}
thead th { background: var(--c-primary); color: #fff; font-weight: 600; }
tbody th { font-weight: 600; background: var(--c-bg-alt); }
tbody tr:last-child th,
tbody tr:last-child td { border-bottom: 0; }

/* ---------- Listes ---------- */
.plain { padding-left: 1.2em; }
.plain li { margin-bottom: 6px; }

/* ---------- Appel à l'action ---------- */
.cta {
  background: var(--c-primary-dark);
  color: #fff;
  border-radius: var(--radius);
  padding: 28px 26px;
  text-align: center;
}
.cta h2 { color: #fff; }
.cta a:not(.btn) { color: #fff; }
.btn {
  display: inline-block;
  background: #f2a900;
  color: #1d2a33;
  font-weight: 700;
  text-decoration: none;
  padding: 12px 26px;
  border-radius: 999px;
  transition: transform .15s ease, background .15s ease;
}
.btn:hover { background: #ffc233; color: #1d2a33; transform: translateY(-1px); }

.source { font-size: .9rem; color: var(--c-muted); }

/* ---------- Pied de page ---------- */
.site-footer {
  margin-top: 60px;
  padding: 28px 0;
  background: var(--c-bg-alt);
  border-top: 1px solid var(--c-border);
  font-size: .88rem;
  color: var(--c-muted);
}
.site-footer a { color: var(--c-muted); }

/* ---------- Pages complémentaires ---------- */
.site-title a { color: #fff; text-decoration: none; }
.main-nav a[aria-current="page"] { text-decoration: underline; font-weight: 700; }

.note {
  background: var(--c-bg-alt);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 12px 16px;
  font-size: .92rem;
  color: var(--c-muted);
}
.small { font-size: .88rem; color: var(--c-muted); }

address { font-style: normal; background: var(--c-bg-alt); border-left: 4px solid var(--c-primary); padding: 12px 18px; border-radius: 0 var(--radius) var(--radius) 0; }

.cards {
  list-style: none;
  padding: 0;
  margin: 18px 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 16px;
}
.cards li {
  background: var(--c-bg-alt);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 16px 18px;
}
.cards h3 { margin: 0 0 6px; font-size: 1.05rem; color: var(--c-primary-dark); }
.cards p { margin: 0; font-size: .96rem; }

.price-box {
  text-align: center;
  background: var(--c-accent);
  border: 2px solid var(--c-primary);
  border-radius: var(--radius);
  padding: 22px 18px;
  margin: 24px 0;
}
.price-label { margin: 0; text-transform: uppercase; letter-spacing: .08em; font-size: .8rem; font-weight: 700; color: var(--c-muted); }
.price { margin: 2px 0 6px; font-size: 2.6rem; font-weight: 800; line-height: 1.1; color: var(--c-primary-dark); }
.price span { font-size: 1.1rem; font-weight: 600; }
.price-note { margin: 0; font-size: .9rem; color: var(--c-muted); }

.steps { padding-left: 1.4em; }
.steps li { margin-bottom: 8px; padding-left: 4px; }

/* ---------- Responsive ---------- */
@media (max-width: 640px) {
  body { font-size: 1rem; }
  .toc ol { columns: 1; }
  .header-inner { flex-direction: column; align-items: flex-start; }
  table { font-size: .85rem; }
  th, td { padding: 8px; }
}

/* ---------- Mode sombre ---------- */
@media (prefers-color-scheme: dark) {
  :root {
    --c-text: #e6edf1;
    --c-muted: #9fb0ba;
    --c-border: #2c3b45;
    --c-bg: #11181d;
    --c-bg-alt: #19232a;
    --c-accent: #14303d;
    --c-primary: #5cb8e0;
    --c-primary-dark: #8fd0ee;
  }
  .site-header { background: #0b3a50; }
  .lead { color: #c4d2da; }
  thead th { background: #0b3a50; }
  .cta { background: #0b3a50; }
  .cta h2, .cta a:not(.btn) { color: #fff; }
}

/* ---------- Impression ---------- */
@media print {
  .site-header, .toc, .cta, .skip-link { display: none; }
  body { font-size: 11pt; color: #000; }
  a { color: #000; text-decoration: underline; }
  section { margin: 20px 0; }
}