/* Fiscalité énergétique : tokens, typographie, composants communs.
   Règle de forme unique : rayon 8px partout (boutons, cellules, champs). */
@font-face{font-family:"Geist";font-style:normal;font-weight:100 900;font-display:swap;
  src:url("../fonts/geist-latin-ext-wght-normal.woff2") format("woff2-variations");
  unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}
@font-face{font-family:"Geist";font-style:normal;font-weight:100 900;font-display:swap;
  src:url("../fonts/geist-latin-wght-normal.woff2") format("woff2-variations");
  unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:"Geist Mono";font-style:normal;font-weight:100 900;font-display:swap;
  src:url("../fonts/geist-mono-latin-wght-normal.woff2") format("woff2-variations");
  unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+2000-206F,U+20AC,U+2122,U+2212}

:root{
  --bg:#F3F6F1; --surface:#FFFFFF; --ink:#12211A; --muted:#4B5D53; --line:#D4DFD6;
  --petrol:#1D5A3B; --petrol-soft:#E1EEE4; --accent:#2E7A4D; --accent-ink:#FFFFFF; --accent-soft:#E3F0E6;
  --flow-line:rgba(29,90,59,.24); --nav-bg:rgba(243,246,241,.84); --focus:#1F6FB8; --danger:#B3261E;
  --r:8px; --gut:max(20px,env(safe-area-inset-left,0px)); --maxw:1180px;
  --ease:cubic-bezier(.16,1,.3,1);
  --font-sans:"Geist",system-ui,-apple-system,"Segoe UI",sans-serif; --font-mono:"Geist Mono",ui-monospace,Menlo,monospace;
  color-scheme:light;
}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    --bg:#0A1410; --surface:#10211A; --ink:#E6EFE9; --muted:#9AB0A2; --line:#1F352A;
    --petrol:#7DCB9C; --petrol-soft:#143023; --accent:#5DBE84; --accent-ink:#0A1410; --accent-soft:#173426;
    --flow-line:rgba(125,203,156,.26); --nav-bg:rgba(10,20,16,.82); --focus:#6DB6F2; --danger:#F2B8B5; color-scheme:dark;
  }
}
:root[data-theme="dark"]{
  --bg:#0A1410; --surface:#10211A; --ink:#E6EFE9; --muted:#9AB0A2; --line:#1F352A;
  --petrol:#7DCB9C; --petrol-soft:#143023; --accent:#5DBE84; --accent-ink:#0A1410; --accent-soft:#173426;
  --flow-line:rgba(125,203,156,.26); --nav-bg:rgba(10,20,16,.82); --focus:#6DB6F2; --danger:#F2B8B5; color-scheme:dark;
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{margin:0;background:var(--bg);color:var(--ink);font:400 17px/1.6 var(--font-sans);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
img{max-width:100%;display:block}
a{color:inherit}
h1,h2,h3{margin:0;font-weight:600;letter-spacing:-.03em;text-wrap:balance}
p{margin:0}
:focus-visible{outline:2px solid var(--focus);outline-offset:3px;border-radius:4px}
.skip{position:absolute;left:var(--gut);top:-60px;background:var(--ink);color:var(--bg);padding:10px 16px;border-radius:var(--r);z-index:100}
.skip:focus{top:12px}
.wrap{width:100%;max-width:var(--maxw);margin-inline:auto;padding-inline:var(--gut)}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

/* boutons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:48px;padding:0 24px;border-radius:var(--r);
  font:600 16px/1 var(--font-sans);text-decoration:none;white-space:nowrap;cursor:pointer;border:1px solid transparent;
  transition:transform .25s var(--ease),background-color .25s,border-color .25s,color .25s}
.btn:active{transform:translateY(1px) scale(.985)}
.btn-primary{background:var(--accent);color:var(--accent-ink)}
.btn-primary:hover{background:color-mix(in srgb,var(--accent) 88%,var(--ink))}
.btn-ghost{border-color:var(--line);color:var(--ink);background:transparent}
.btn-ghost:hover{border-color:var(--petrol);color:var(--petrol)}

/* navigation, une seule ligne, 68px */
.nav{position:fixed;inset:0 0 auto;z-index:50;height:68px;display:flex;align-items:center;transition:background-color .3s,border-color .3s;border-bottom:1px solid transparent}
.nav.is-scrolled{background:var(--nav-bg);backdrop-filter:blur(14px) saturate(140%);-webkit-backdrop-filter:blur(14px) saturate(140%);border-color:var(--line)}
.nav .wrap{display:flex;align-items:center;justify-content:space-between;gap:24px}
.brand{font-weight:600;letter-spacing:-.02em;text-decoration:none;font-size:18px;white-space:nowrap}
.nav ul{display:flex;gap:28px;list-style:none;margin:0;padding:0}
.nav ul a{text-decoration:none;color:var(--muted);font-size:15px;font-weight:500;transition:color .2s}
.nav ul a:hover{color:var(--ink)}
.nav .btn{min-height:42px;padding:0 18px;font-size:15px}
@media (max-width:480px){.nav .btn{display:none}}
@media (max-width:860px){.nav ul{display:none}}

.sec{padding-block:clamp(72px,10vw,140px)}
.sec h2{font-size:clamp(1.9rem,3.8vw,3rem);line-height:1.08}
.lede{color:var(--muted);max-width:60ch;margin-top:18px;font-size:18px}

footer{border-top:1px solid var(--line);padding-block:36px 48px;color:var(--muted);font-size:15px}
footer .wrap{display:flex;flex-wrap:wrap;gap:12px 32px;justify-content:space-between}
footer a{text-decoration:none}
footer a:hover{color:var(--ink);text-decoration:underline}