/* tree.ring : base commune des accueils. DA : coupe de bois, brun très sombre, bois clair, ocre. */
@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Sans:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500&family=STIX+Two+Text:ital@0;1&display=swap');
:root{
  --bg:#1e140c; --bg2:#2a1c11; --bg3:#36251a; --line:#4a3322;
  --wood:#e6c89a; --wood2:#f1dfbd; --late:#b8895a; --drought:#7a4a24; --resin:#d9892b; --scar:#0b0705;
  --text:#f3e6cf; --muted:#b59a78; --dim:#8a7358;
  --sans:'IBM Plex Sans',system-ui,sans-serif; --mono:'JetBrains Mono',ui-monospace,monospace; --math:'STIX Two Text',serif;
}
*{box-sizing:border-box}
html,body{margin:0;background:var(--bg);color:var(--text);font-family:var(--sans);-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
.nav{display:flex;align-items:center;justify-content:space-between;padding:20px 40px;max-width:1280px;margin:0 auto}
.logo{font-family:var(--mono);font-weight:500;letter-spacing:.02em;display:flex;align-items:center;gap:10px;font-size:15px}
.logo i{width:18px;height:18px;border-radius:50%;background:repeating-radial-gradient(circle,var(--wood) 0 2px,var(--late) 2px 3px);display:inline-block}
.nav nav{display:flex;gap:28px;font-size:14px;color:var(--muted)}
.nav nav a:hover{color:var(--wood)}
.btn{display:inline-flex;align-items:center;gap:10px;padding:13px 22px;border-radius:999px;background:var(--wood);color:var(--bg);font-weight:600;font-size:15px;border:0;cursor:pointer;
  box-shadow:inset 0 -2px 0 rgba(0,0,0,.18),inset 0 1px 0 rgba(255,255,255,.4);transition:transform .2s,background .2s}
.btn:hover{background:var(--wood2);transform:translateY(-1px)}
.btn.ghost{background:transparent;color:var(--wood);box-shadow:inset 0 0 0 1px var(--line)}
.btn.sm{padding:9px 16px;font-size:13px}
.mono{font-family:var(--mono)}
.label{font-family:var(--mono);font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted)}
.demo-tag{font-family:var(--mono);font-size:10px;letter-spacing:.12em;text-transform:uppercase;color:var(--resin);border:1px solid rgba(217,137,43,.4);padding:2px 7px;border-radius:4px}
.math{font-family:var(--math);font-style:italic}
.trunk svg{display:block;width:100%;height:auto}
.trunk.round svg{border-radius:50%}
.variant-tag{position:fixed;right:12px;bottom:12px;font:11px var(--mono);color:var(--dim);background:rgba(0,0,0,.35);padding:6px 9px;border-radius:6px;z-index:99}
.foot{max-width:1280px;margin:0 auto;padding:32px 40px;color:var(--dim);font-size:12px;display:flex;justify-content:space-between;border-top:1px solid var(--line)}
@media (max-width:760px){.nav{padding:16px}.nav nav{display:none}.foot{padding:24px 16px;flex-direction:column;gap:8px}}
.trunk svg>rect{fill:transparent}
/* arbres debout : jamais rognés en cercle */
.trunk.tree,.trunk.tree svg{border-radius:0!important;overflow:visible!important;box-shadow:none!important}