/* Layout : colonne éditoriale de ~68ch, bandes pleine largeur pour les sections clés ; matières du bâti ligérien (ardoise, chaux, chanvre) */
:root {
  --bg: #f5f5f1;          /* badigeon de chaux */
  --surface: #ebeae3;
  --fg: #1f2a31;          /* ardoise */
  --muted: #56616a;
  --line: #cfd0c6;
  --accent: #46622a;      /* chanvre */
  --accent-fg: #ffffff;
  --ochre: #a8741c;       /* ocre, pour les repères chiffrés */
  --slate-band: #26333c;
  --slate-band-fg: #eef0ea;
  --focus: #a8741c;
  --font-display: "Bricolage Grotesque", "Avenir Next", "Segoe UI", system-ui, sans-serif;
  --font-body: "Public Sans", "Segoe UI", system-ui, -apple-system, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;
  --step--1: 0.875rem;
  --step-0: 1.0625rem;
  --step-1: 1.3rem;
  --step-2: 1.7rem;
  --step-3: 2.3rem;
  --step-4: clamp(2.3rem, 6vw, 3.6rem);
  --radius: 6px;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #161d22; --surface: #1f282e; --fg: #e8eae4; --muted: #a3ada8; --line: #34404a;
    --accent: #9cbc6c; --accent-fg: #142010; --ochre: #e0ad55;
    --slate-band: #0f1519; --slate-band-fg: #e8eae4; --focus: #e0ad55;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #161d22; --surface: #1f282e; --fg: #e8eae4; --muted: #a3ada8; --line: #34404a;
  --accent: #9cbc6c; --accent-fg: #142010; --ochre: #e0ad55;
  --slate-band: #0f1519; --slate-band-fg: #e8eae4; --focus: #e0ad55;
  color-scheme: dark;
}

* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--fg);
  font-family: var(--font-body); font-size: var(--step-0); line-height: 1.6;
}
.wrap {
  max-width: 1080px; margin: 0 auto;
  padding-left: max(16px, env(safe-area-inset-left, 0px));
  padding-right: max(16px, env(safe-area-inset-right, 0px));
}
.prose { max-width: 68ch; }
h1, h2, h3 { font-family: var(--font-display); line-height: 1.12; text-wrap: balance; margin: 0; }
h1 { font-size: var(--step-4); font-weight: 700; letter-spacing: -0.02em; }
h2 { font-size: var(--step-3); font-weight: 650; letter-spacing: -0.01em; }
h3 { font-size: var(--step-1); font-weight: 650; }
p { margin: 0; }
a { color: var(--accent); text-underline-offset: 3px; }
a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible, summary:focus-visible {
  outline: 3px solid var(--focus); outline-offset: 2px;
}
.eyebrow {
  font-family: var(--font-mono); font-size: var(--step--1); text-transform: uppercase;
  letter-spacing: 0.08em; color: var(--ochre);
}
.stack { display: flex; flex-direction: column; gap: 1rem; }
.stack-lg { display: flex; flex-direction: column; gap: 2rem; }
section { padding-block: 4rem; }
.band { background: var(--slate-band); color: var(--slate-band-fg); }
.band a { color: var(--slate-band-fg); }
.band .muted { color: color-mix(in srgb, var(--slate-band-fg) 72%, transparent); }
.muted { color: var(--muted); }
.small { font-size: var(--step--1); }

/* En-tête */
.site-header { border-bottom: 1px solid var(--line); }
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; gap: 1rem; flex-wrap: wrap; padding-block: 0.9rem; }
.logo { font-family: var(--font-display); font-weight: 700; font-size: 1.35rem; color: var(--fg); text-decoration: none; letter-spacing: -0.01em; }
.logo span { color: var(--accent); font-weight: 500; }
.nav { display: flex; gap: 1.1rem; flex-wrap: wrap; font-size: var(--step--1); }
.nav a { color: var(--fg); text-decoration: none; }
.nav a:hover, .nav a[aria-current="page"] { color: var(--accent); text-decoration: underline; }

/* Boutons */
.btn {
  display: inline-flex; align-items: center; gap: 0.5rem; padding: 0.8rem 1.25rem;
  background: var(--accent); color: var(--accent-fg); border: 0; border-radius: var(--radius);
  font: 600 1rem/1 var(--font-body); text-decoration: none; cursor: pointer;
}
.btn:hover { filter: brightness(1.08); }
.btn-ghost { background: transparent; color: inherit; border: 1.5px solid currentColor; }
.btn-row { display: flex; gap: 0.75rem; flex-wrap: wrap; }

/* Accueil */
.hero { padding-block: 3.5rem 3rem; }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr); gap: 3rem; align-items: center; }
.hero .lead { font-size: var(--step-1); color: var(--muted); max-width: 40ch; }
@media (max-width: 820px) { .hero-grid { grid-template-columns: minmax(0, 1fr); gap: 2rem; } }

.carnet {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 1.25rem; font-size: var(--step--1); min-width: 0;
}
.carnet-head { display: flex; justify-content: space-between; gap: 1rem; font-family: var(--font-mono); color: var(--muted); border-bottom: 1px dashed var(--line); padding-bottom: 0.6rem; margin-bottom: 0.6rem; flex-wrap: wrap; }
.carnet ol { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 0.55rem; }
.carnet li { display: grid; grid-template-columns: 1.4rem minmax(0, 1fr); gap: 0.5rem; align-items: start; }
.carnet .tick { width: 1.2rem; height: 1.2rem; border-radius: 3px; border: 1.5px solid var(--accent); display: grid; place-items: center; font-size: 0.8rem; color: var(--accent-fg); margin-top: 0.15rem; }
.carnet .done .tick { background: var(--accent); }
.carnet .who { display: block; color: var(--muted); font-family: var(--font-mono); font-size: 0.78rem; }
.carnet .note { margin-top: 0.8rem; color: var(--muted); font-style: italic; }

.steps { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 2rem; counter-reset: step; margin-top: 2rem; }
.steps li { list-style: none; display: flex; flex-direction: column; gap: 0.5rem; min-width: 0; }
.steps li::before { counter-increment: step; content: "Étape " counter(step); font-family: var(--font-mono); font-size: var(--step--1); color: var(--ochre); letter-spacing: 0.05em; text-transform: uppercase; }
.steps { padding: 0; }
@media (max-width: 760px) { .steps { grid-template-columns: minmax(0, 1fr); } }

.split { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 3rem; }
@media (max-width: 760px) { .split { grid-template-columns: minmax(0, 1fr); gap: 2rem; } }
.checklist { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 0.6rem; }
.checklist li { padding-left: 1.6rem; position: relative; }
.checklist li::before { content: ""; position: absolute; left: 0; top: 0.6em; width: 0.8rem; height: 2px; background: var(--ochre); }

.trades { display: flex; flex-wrap: wrap; gap: 0.5rem; padding: 0; margin: 0; list-style: none; }
.trades li { border: 1px solid var(--line); border-radius: 999px; padding: 0.3rem 0.8rem; font-size: var(--step--1); }
.band .trades li { border-color: color-mix(in srgb, var(--slate-band-fg) 35%, transparent); }

.depts { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 0.75rem; margin-top: 1.5rem; }
.depts div { border-top: 2px solid var(--ochre); padding-top: 0.5rem; min-width: 0; }
.depts b { font-family: var(--font-mono); font-size: var(--step-2); display: block; font-weight: 500; }
@media (max-width: 680px) { .depts { grid-template-columns: repeat(2, minmax(0, 1fr)); } }

/* FAQ */
details { border-bottom: 1px solid var(--line); padding-block: 1rem; }
summary { cursor: pointer; font-weight: 600; font-family: var(--font-display); font-size: 1.15rem; }
details p { margin-top: 0.75rem; max-width: 68ch; }

/* Formulaires */
.form-card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.5rem; }
.tabs { display: flex; gap: 0.5rem; flex-wrap: wrap; margin-bottom: 1.25rem; }
.tabs button { font: 600 1rem var(--font-body); padding: 0.6rem 1rem; border-radius: var(--radius); border: 1.5px solid var(--line); background: var(--bg); color: var(--fg); cursor: pointer; }
.tabs button[aria-selected="true"] { background: var(--fg); color: var(--bg); border-color: var(--fg); }
form { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem 1.25rem; }
form .full { grid-column: 1 / -1; }
@media (max-width: 640px) { form { grid-template-columns: minmax(0, 1fr); } }
label, legend { font-weight: 600; font-size: var(--step--1); display: block; margin-bottom: 0.3rem; }
fieldset { border: 0; padding: 0; margin: 0; min-width: 0; }
input[type="text"], input[type="email"], input[type="tel"], select, textarea {
  width: 100%; padding: 0.65rem 0.75rem; border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--bg); color: var(--fg); font: inherit;
}
textarea { min-height: 6rem; resize: vertical; }
.opts { display: flex; flex-wrap: wrap; gap: 0.4rem 1rem; }
.opts label { font-weight: 400; font-size: var(--step-0); display: inline-flex; gap: 0.4rem; align-items: center; margin: 0; }
.hint { font-weight: 400; color: var(--muted); }
.form-msg { padding: 1rem; border-radius: var(--radius); background: color-mix(in srgb, var(--accent) 14%, transparent); border: 1px solid var(--accent); }
.form-error { color: #b3261e; font-size: var(--step--1); }
:root[data-theme="dark"] .form-error { color: #ffb4ab; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .form-error { color: #ffb4ab; } }

/* Pages de contenu */
.article-head { padding-block: 3rem 1.5rem; border-bottom: 1px solid var(--line); }
.article-head .lead { font-size: var(--step-1); color: var(--muted); max-width: 60ch; margin-top: 1rem; }
.article { padding-block: 2.5rem 4rem; display: grid; grid-template-columns: minmax(0, 1fr) 15rem; gap: 3rem; }
.article .body { display: flex; flex-direction: column; gap: 1.1rem; min-width: 0; }
.article .body h2 { font-size: var(--step-2); margin-top: 1.5rem; }
.article .body h3 { margin-top: 0.5rem; }
.article .body ul, .article .body ol { margin: 0; padding-left: 1.25rem; display: flex; flex-direction: column; gap: 0.4rem; }
.article aside { font-size: var(--step--1); position: sticky; top: 1rem; align-self: start; display: flex; flex-direction: column; gap: 0.6rem; }
.article aside a { display: block; }
@media (max-width: 860px) { .article { grid-template-columns: minmax(0, 1fr); } .article aside { position: static; } }
.callout { border-left: 3px solid var(--ochre); padding: 0.75rem 1rem; background: var(--surface); }
.table-scroll { overflow-x: auto; }
table { border-collapse: collapse; width: 100%; font-size: var(--step--1); font-variant-numeric: tabular-nums; }
th, td { text-align: left; padding: 0.55rem 0.6rem; border-bottom: 1px solid var(--line); vertical-align: top; }
th { font-family: var(--font-display); font-weight: 600; }
td.num { font-family: var(--font-mono); white-space: nowrap; }
.calc { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.25rem; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; }
.calc .result { grid-column: 1 / -1; font-family: var(--font-mono); font-size: var(--step-2); color: var(--ochre); }
@media (max-width: 560px) { .calc { grid-template-columns: minmax(0, 1fr); } }
.cta-band { padding-block: 3rem; }
.cta-band .wrap { display: flex; justify-content: space-between; align-items: center; gap: 1.5rem; flex-wrap: wrap; }

/* Pied de page */
.site-footer { border-top: 1px solid var(--line); padding-block: 2.5rem; font-size: var(--step--1); color: var(--muted); }
.site-footer .wrap { display: grid; grid-template-columns: minmax(0, 2fr) minmax(0, 1fr); gap: 2rem; }
.site-footer nav { display: flex; flex-direction: column; gap: 0.3rem; }
@media (max-width: 680px) { .site-footer .wrap { grid-template-columns: minmax(0, 1fr); } }

@media (prefers-reduced-motion: no-preference) {
  .btn { transition: filter 0.15s ease; }
}

/* v2 : séparation propriétaires / artisans */
.nav a.nav-switch { color: var(--muted); border: 1px solid var(--line); border-radius: 999px; padding: 0.1rem 0.7rem; }
.nav a.nav-switch:hover { color: var(--accent); border-color: var(--accent); text-decoration: none; }
.pains { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 2rem; margin-top: 2rem; }
.pains > div { border-top: 2px solid var(--ochre); padding-top: 1rem; min-width: 0; }
@media (max-width: 760px) { .pains { grid-template-columns: minmax(0, 1fr); } }
.band table th, .band table td { border-bottom-color: color-mix(in srgb, var(--slate-band-fg) 22%, transparent); }
.compare { font-size: var(--step-0); min-width: 640px; }
.compare tbody th { font-family: var(--font-body); font-weight: 600; }
.compare .hl { color: var(--ochre); font-weight: 600; }
.pro-strip { padding-block: 1.25rem; border-top: 1px solid var(--line); }
.pro-strip .wrap { display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; align-items: center; }
.calc-3 input { width: 100%; }
.calc .small { display: block; margin-top: 0.3rem; }
.guide-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 19rem), 1fr)); gap: 1.25rem; }
.guide-card { display: flex; flex-direction: column; gap: 0.5rem; padding: 1.25rem; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); color: var(--fg); text-decoration: none; }
.guide-card strong { font-family: var(--font-display); font-size: var(--step-1); line-height: 1.2; }
.guide-card:hover { border-color: var(--accent); }