/* Méthalayou — site vitrine
   Mise en page : une seule colonne de lecture (~68 car.), des bandeaux pleine largeur
   où les photos drone restent en fond, voilées, derrière le texte. */
:root {
  --bg: #f2f4ef;          /* vert de prairie très pâle */
  --surface: #ffffff;
  --ink: #1b2620;         /* vert haie presque noir */
  --muted: #56645b;
  --line: #d5dcd2;
  --accent: #1d6551;      /* vert digesteur */
  --accent-ink: #ffffff;
  --dawn: #c77a1c;        /* lever de soleil sur le Layou, usage rare */
  --veil: rgba(242, 244, 239, 0.82);
  --veil-strong: rgba(242, 244, 239, 0.94);
  --logo-bg: #ffffff;      /* fond blanc pour les logos partenaires, dans les deux thèmes */
  --logo-ink: #1b2620;

  --f-display: "Bricolage Grotesque", "Avenir Next", "Segoe UI", system-ui, sans-serif;
  --f-body: "Source Sans 3", "Segoe UI", system-ui, -apple-system, sans-serif;
  --f-data: "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: clamp(2rem, 1.4rem + 2.6vw, 3.1rem);
  --measure: 68ch;
  --wrap: 72rem;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #111915; --surface: #18221d; --ink: #e6ece6; --muted: #a3b2a8; --line: #2b3a32;
    --accent: #6fc3a6; --accent-ink: #0d1a14; --dawn: #e8a24c;
    --veil: rgba(17, 25, 21, 0.80); --veil-strong: rgba(17, 25, 21, 0.93);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #111915; --surface: #18221d; --ink: #e6ece6; --muted: #a3b2a8; --line: #2b3a32;
  --accent: #6fc3a6; --accent-ink: #0d1a14; --dawn: #e8a24c;
  --veil: rgba(17, 25, 21, 0.80); --veil-strong: rgba(17, 25, 21, 0.93);
  color-scheme: dark;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 400 var(--step-0)/1.6 var(--f-body);
}
img { max-width: 100%; }
a { color: var(--accent); text-underline-offset: 0.18em; }
a:focus-visible, button:focus-visible, summary:focus-visible {
  outline: 3px solid var(--dawn); outline-offset: 3px; border-radius: 4px;
}
h1, h2, h3 { font-family: var(--f-display); line-height: 1.15; text-wrap: balance; margin: 0; }
h1 { font-size: var(--step-3); font-weight: 700; letter-spacing: -0.015em; }
h2 { font-size: var(--step-2); font-weight: 650; }
h3 { font-size: var(--step-1); font-weight: 600; }
p { margin: 0; }

.wrap {
  max-width: var(--wrap);
  margin-inline: auto;
  padding-left: max(16px, env(safe-area-inset-left, 0px));
  padding-right: max(16px, env(safe-area-inset-right, 0px));
}
.eyebrow {
  font: 600 var(--step--1)/1.2 var(--f-body);
  text-transform: uppercase; letter-spacing: 0.09em; color: var(--muted);
}
.skip { position: absolute; left: -999px; }
.skip:focus { left: 16px; top: 16px; z-index: 30; background: var(--surface); padding: 8px 12px; }

/* En-tête */
body::before {
  content: ""; position: fixed; inset: 0 0 auto; height: env(safe-area-inset-top, 0px);
  z-index: 10; background: var(--bg);
}
.site-header {
  position: sticky; top: env(safe-area-inset-top, 0px); z-index: 9;
  background: var(--veil-strong);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.site-header .wrap {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between;
  gap: 8px 24px; padding-block: 12px;
}
.brand {
  font: 700 1.25rem/1 var(--f-display); color: var(--ink); text-decoration: none;
  display: inline-flex; align-items: center; gap: 10px;
}
.brand small { font: 400 var(--step--1)/1 var(--f-body); color: var(--muted); }
.brand-mark { width: 34px; height: 34px; align-self: center; margin-right: -2px; }
.nav { display: flex; flex-wrap: wrap; gap: 4px 18px; font-size: var(--step--1); }
.nav a { color: var(--ink); text-decoration: none; padding-block: 4px; }
.nav a:hover { color: var(--accent); text-decoration: underline; }
.nav .nav-cta { color: var(--accent); font-weight: 600; }
.nav .ged-link { color: var(--muted); }

/* Bandeaux à photo de fond : la photo reste derrière un voile, jamais au premier plan */
.band { position: relative; isolation: isolate; }
.band::before {
  content: ""; position: absolute; inset: 0; z-index: -2;
  background: var(--photo) center / cover no-repeat;
}
.band::after { content: ""; position: absolute; inset: 0; z-index: -1; background: var(--veil); }
.band > .wrap { padding-block: clamp(48px, 7vw, 88px); }
.band-hero { --photo: url("../img/aube.jpg"); }
.band-riverains { --photo: url("../img/ete.jpg"); }
.band-apports { --photo: url("../img/site.jpg"); }
.band-hero::after {
  background: linear-gradient(100deg, var(--veil-strong) 0%, var(--veil-strong) 40%, var(--veil) 100%);
}
@media (max-width: 720px) {
  .band-hero { --photo: url("../img/aube-960.jpg"); }
  .band-riverains { --photo: url("../img/ete-960.jpg"); }
  .band-apports { --photo: url("../img/site-960.jpg"); }
}

/* Accueil */
.hero { display: grid; gap: 20px; max-width: 46rem; }
.hero .lead { font-size: var(--step-1); line-height: 1.5; color: var(--ink); max-width: var(--measure); }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 8px; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  font: 600 1rem/1 var(--f-body); padding: 14px 20px; border-radius: 6px;
  border: 2px solid var(--accent); text-decoration: none; cursor: pointer;
}
.btn-primary { background: var(--accent); color: var(--accent-ink); }
.btn-primary:hover { filter: brightness(1.08); }
.btn-ghost { background: transparent; color: var(--accent); }
.btn-ghost:hover { background: var(--surface); }

.facts {
  display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0;
  margin-top: clamp(32px, 5vw, 56px);
  border-top: 1px solid var(--line);
}
.facts > div { padding: 16px 16px 0 0; display: grid; gap: 2px; min-width: 0; }
.facts dt { order: 2; font-size: var(--step--1); color: var(--muted); line-height: 1.35; }
.facts dd {
  order: 1; margin: 0; font: 500 var(--step-2)/1.1 var(--f-data);
  font-variant-numeric: tabular-nums; color: var(--ink);
}
.facts dd span { font-size: var(--step--1); color: var(--muted); margin-left: 4px; }
@media (max-width: 720px) { .facts { grid-template-columns: repeat(2, minmax(0, 1fr)); row-gap: 12px; } .facts > div:last-child:nth-child(odd) { grid-column: span 2; } }

/* Sections de texte */
.section > .wrap { padding-block: clamp(48px, 7vw, 88px); }
.section + .section > .wrap { padding-top: 0; }
.prose { display: grid; gap: 16px; max-width: var(--measure); }
.prose p { color: var(--ink); }
.prose .muted { color: var(--muted); }
.head { display: grid; gap: 10px; margin-bottom: 28px; max-width: var(--measure); }

.steps {
  list-style: none; margin: 0; padding: 0; counter-reset: s;
  display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 28px;
}
.steps li { counter-increment: s; display: grid; gap: 8px; align-content: start; min-width: 0; }
.steps li::before {
  content: counter(s); font: 500 var(--step--1)/1 var(--f-data); color: var(--dawn);
  border-bottom: 1px solid var(--line); padding-bottom: 10px;
}
.steps p { color: var(--muted); }
@media (max-width: 760px) { .steps { grid-template-columns: 1fr; gap: 20px; } }

.two { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 40px; align-items: start; }
@media (max-width: 860px) { .two { grid-template-columns: 1fr; gap: 28px; } }

.points { list-style: none; margin: 0; padding: 0; display: grid; gap: 18px; }
.points li { display: grid; gap: 4px; padding-left: 16px; border-left: 2px solid var(--line); }
.points strong { font-family: var(--f-display); font-weight: 600; font-size: 1.05rem; }
.points span { color: var(--muted); }

.panel {
  background: var(--surface); border: 1px solid var(--line); border-radius: 8px;
  padding: 24px; display: grid; gap: 14px;
}
.panel ul { margin: 0; padding-left: 1.1em; display: grid; gap: 6px; }
.panel .note { font-size: var(--step--1); color: var(--muted); }

/* Schéma du flux */
.flow { margin: 0; display: grid; gap: 12px; }
.flow svg { width: 100%; height: auto; max-width: 100%; display: block; }
.flow-wide { max-width: 60rem; }
.flow-tall { display: none !important; max-width: 24rem; }
@media (max-width: 640px) { .flow-wide { display: none !important; } .flow-tall { display: block !important; } }
.flow figcaption { font-size: var(--step--1); color: var(--muted); max-width: var(--measure); }
.flow .box rect { fill: var(--surface); stroke: var(--line); stroke-width: 1.5; }
.flow .box-main rect { stroke: var(--accent); stroke-width: 2; }
.flow .t-h { font: 600 15px var(--f-display); fill: var(--ink); }
.flow .t-sub { font: 400 12px var(--f-body); fill: var(--muted); }
.flow .t-gas { fill: var(--accent); font-weight: 600; }
.flow path[class^="l-"] { fill: none; stroke-width: 2; }
.flow .l-in { stroke: var(--muted); }
.flow .l-gas { stroke: var(--accent); }
.flow .l-soil { stroke: var(--dawn); }
.flow .dash { stroke-dasharray: 5 5; }
.flow .f-in { fill: var(--muted); }
.flow .f-gas { fill: var(--accent); }
.flow .f-soil { fill: var(--dawn); }

/* Le site : bande mise en avant et infographies */
.sprite { position: absolute; width: 0; height: 0; overflow: hidden; }
.section-site { background: var(--surface); border-block: 1px solid var(--line); }
.section-site > .wrap { padding-block: clamp(56px, 8vw, 104px); }
.section-site h2 { font-size: var(--step-3); }
.section-site + .band > .wrap { padding-top: clamp(48px, 7vw, 88px); }
.nav .nav-site { font-weight: 600; }
.stats {
  list-style: none; margin: 8px 0 40px; padding: 0;
  display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px;
}
.stats li {
  display: grid; grid-template-columns: 48px minmax(0, 1fr); column-gap: 14px; row-gap: 2px;
  align-items: center; padding: 18px; border-radius: 10px; background: var(--bg); min-width: 0;
}
.stats .ico {
  grid-row: span 2; width: 48px; height: 48px; padding: 11px; border-radius: 50%;
  color: var(--accent); background: var(--surface); border: 1.5px solid var(--line);
}
.stats strong { font: 500 var(--step-2)/1.1 var(--f-data); font-variant-numeric: tabular-nums; color: var(--ink); }
.stats .u { font: 500 var(--step--1)/1 var(--f-data); color: var(--accent); }
.stats .lbl { font-size: var(--step--1); color: var(--muted); line-height: 1.35; }
@media (max-width: 860px) { .stats { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 520px) {
  .stats { gap: 10px; }
  .stats li { grid-template-columns: minmax(0, 1fr); padding: 14px; row-gap: 6px; }
  .stats .ico { grid-row: auto; width: 40px; height: 40px; padding: 9px; }
  .stats strong { font-size: var(--step-1); }
}
.flow-tall .t-h { font-size: 14px; }
.flow .ico-in { color: var(--muted); }
.flow .ico-gas { color: var(--accent); }
.flow .ico-soil { color: var(--dawn); }
.source { font-size: var(--step--1); color: var(--muted); border-top: 1px solid var(--line); padding-top: 12px; }

/* Intrants et CIVE */
.intrants { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.25fr); gap: 32px; align-items: start; margin-bottom: 44px; }
@media (max-width: 860px) { .intrants { grid-template-columns: minmax(0, 1fr); gap: 24px; } }
.mix { display: grid; gap: 14px; min-width: 0; }
.mix-bar { display: flex; height: 56px; border-radius: 8px; overflow: hidden; }
.mix-bar span { display: flex; align-items: center; gap: 6px; padding: 0 14px; font-size: var(--step--1); min-width: 0; white-space: nowrap; }
.mix-bar strong { font: 500 var(--step-1)/1 var(--f-data); }
.mix-agri { background: var(--accent); color: var(--accent-ink); }
.mix-iaa { background: var(--line); color: var(--ink); justify-content: center; }
.mix-legend { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; font-size: var(--step--1); color: var(--muted); }
.mix-legend li { display: flex; gap: 10px; align-items: baseline; }
.dot { width: 12px; height: 12px; border-radius: 3px; flex: none; transform: translateY(1px); }
.dot-agri { background: var(--accent); }
.dot-iaa { background: var(--line); }
.cive { background: var(--bg); border-radius: 10px; padding: 22px; display: grid; gap: 12px; min-width: 0; }
.cive-points { list-style: none; margin: 4px 0 0; padding: 0; display: grid; gap: 14px; }
.cive-points li { display: grid; grid-template-columns: 40px minmax(0, 1fr); gap: 12px; align-items: start; color: var(--ink); }
.cive-points .ico { width: 40px; height: 40px; padding: 9px; border-radius: 50%; color: var(--accent); background: var(--surface); border: 1.5px solid var(--line); }
.flow .ico-agri { color: var(--accent); }

/* Questions */
.faq { display: grid; gap: 0; max-width: var(--measure); border-top: 1px solid var(--line); }
.faq details { border-bottom: 1px solid var(--line); }
.faq summary {
  cursor: pointer; list-style: none; padding: 16px 32px 16px 0; position: relative;
  font: 600 1.05rem/1.4 var(--f-display);
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+"; position: absolute; right: 4px; top: 14px; font: 400 1.4rem/1 var(--f-data); color: var(--accent);
}
.faq details[open] summary::after { content: "–"; }
.faq details p { padding: 0 0 18px; color: var(--muted); }

/* Contact */
.contact { background: var(--surface); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.contact .wrap { padding-block: clamp(48px, 7vw, 88px); }
.mailbox { display: grid; gap: 14px; justify-items: start; }
.mail-addr {
  font: 500 var(--step-1)/1.3 var(--f-data); color: var(--ink);
  word-break: break-all; user-select: all;
}
.mail-row { display: flex; flex-wrap: wrap; gap: 10px; }
.status { font-size: var(--step--1); color: var(--muted); min-height: 1.4em; }
.checklist { margin: 0; padding-left: 1.1em; color: var(--muted); display: grid; gap: 4px; }

.where { display: grid; gap: 8px; justify-items: start; margin-top: 12px; padding-top: 20px; border-top: 1px solid var(--line); width: 100%; }

/* Partenaires */
.partners > .wrap { padding-block: 32px; display: flex; flex-wrap: wrap; align-items: center; gap: 12px 32px; }
.partner-list { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 8px 32px; }
.partner-list li { font: 600 var(--step-1)/1.3 var(--f-display); color: var(--ink); }
.partner {
  display: inline-flex; align-items: center; justify-content: center; min-height: 76px; padding: 10px 18px;
  background: var(--logo-bg); border: 1px solid var(--line); border-radius: 8px;
  color: var(--logo-ink); text-decoration: none;
}
.partner:hover { border-color: var(--accent); }
.partner img { height: 56px; width: auto; max-width: 220px; object-fit: contain; display: block; }
.partner img.logo-wide { height: 36px; }

/* Pied de page */
.site-footer { font-size: var(--step--1); color: var(--muted); }
.site-footer .wrap {
  padding-block: 32px; display: flex; flex-wrap: wrap; gap: 12px 32px; justify-content: space-between;
}
.site-footer nav { display: flex; flex-wrap: wrap; gap: 6px 18px; }
.site-footer a { color: var(--muted); }

/* Page simple (mentions légales) */
.page > .wrap { padding-block: 48px 72px; }
.page .prose h2 { margin-top: 16px; font-size: var(--step-1); }