:root{--bg:#f5f5f7;--card:#fff;--text:#1d1d1f;--muted:#6e6e73;--blue:#0066cc;--line:#e5e5ea;--shadow:0 18px 45px rgba(0,0,0,.08);--radius:22px}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Arial,sans-serif;background:linear-gradient(180deg,#fbfbfd 0%,var(--bg) 260px);color:var(--text)}
a{text-decoration:none;color:inherit}.topbar{position:sticky;top:0;z-index:20;display:flex;align-items:center;justify-content:space-between;gap:22px;padding:14px 38px;background:rgba(255,255,255,.78);backdrop-filter:blur(22px);border-bottom:1px solid rgba(229,229,234,.85)}.brand{display:flex;align-items:center;gap:12px;min-width:max-content}.logo{width:160px;display:block}.topnav{display:flex;align-items:center;justify-content:flex-end;gap:6px;flex-wrap:wrap}.topnav a{padding:10px 12px;border-radius:999px;color:#3a3a3c;font-size:14px;font-weight:700;white-space:nowrap}.topnav a:hover,.topnav a.active{background:#eef5ff;color:var(--blue)}
.content{padding:42px 38px 56px;max-width:1380px;margin:0 auto}.hero{margin-bottom:24px}.hero h1{font-size:46px;letter-spacing:-.05em;margin:0 0 8px;line-height:1.03}.hero p{color:var(--muted);font-size:17px;margin:0}.grid{display:grid;grid-template-columns:repeat(12,1fr);gap:18px}.card{background:rgba(255,255,255,.92);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:22px}.span4{grid-column:span 4}.span6{grid-column:span 6}.span8{grid-column:span 8}.span12{grid-column:span 12}.card h2{font-size:20px;margin:0 0 18px;letter-spacing:-.02em}.row{display:grid;grid-template-columns:1fr 1fr;gap:12px}.field{display:grid;gap:7px;margin-bottom:12px}.field label{font-size:13px;color:var(--muted);font-weight:700}input,select{width:100%;padding:12px 13px;border:1px solid #d2d2d7;border-radius:12px;background:#fff;font-size:15px}input:focus,select:focus{outline:3px solid rgba(0,102,204,.16);border-color:var(--blue)}button{border:0;background:var(--blue);color:white;border-radius:12px;padding:11px 14px;font-weight:800;cursor:pointer}button.secondary{background:#eef0f4;color:#1d1d1f}button.danger{background:#ff3b30}.result{display:flex;justify-content:space-between;gap:20px;padding:10px 0;border-bottom:1px solid var(--line)}.result b{color:var(--blue)}table{width:100%;border-collapse:collapse;font-size:14px}th,td{padding:11px;border-bottom:1px solid var(--line);text-align:left}th{color:var(--muted);font-size:12px;text-transform:uppercase}.pill{display:inline-block;padding:5px 9px;border-radius:999px;background:#eef5ff;color:var(--blue);font-weight:800}.actions{display:flex;gap:8px;flex-wrap:wrap}.homecards{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:18px}.homecard{background:rgba(255,255,255,.92);border:1px solid var(--line);border-radius:26px;padding:26px;box-shadow:var(--shadow);transition:.2s}.homecard:hover{transform:translateY(-3px)}.homecard .icon{font-size:34px}.mini{font-size:13px;color:var(--muted)}canvas{max-width:100%;height:260px!important}
@media(max-width:980px){.topbar{align-items:flex-start;flex-direction:column;padding:14px 22px}.topnav{justify-content:flex-start}.content{padding:24px 22px 44px}.span4,.span6,.span8,.span12{grid-column:span 12}.row{grid-template-columns:1fr}.hero h1{font-size:36px}.logo{width:150px}}
@media(max-width:560px){.topnav{overflow-x:auto;flex-wrap:nowrap;width:100%;padding-bottom:4px}.topnav a{font-size:13px}.content{padding-left:16px;padding-right:16px}.card{padding:18px}}

/* Hydrools v3: no lateral or horizontal navigation */
.topbar.simple{justify-content:center;position:relative;padding:18px 28px;background:rgba(255,255,255,.86);backdrop-filter:blur(18px);border-bottom:1px solid var(--line)}
.topbar.simple .brand.center{margin:auto}.topbar.simple .logo{height:48px;width:auto}.topbar.simple .back{position:absolute;left:28px;top:50%;transform:translateY(-50%);text-decoration:none;color:var(--blue);font-weight:700;background:#fff;border:1px solid var(--line);border-radius:999px;padding:10px 14px;box-shadow:0 8px 24px rgba(0,0,0,.06)}
.topnav{display:none!important}.mutedbox{background:#f5f5f7;border:1px solid var(--line);border-radius:18px;padding:14px;margin:12px 0}
@media(max-width:720px){.topbar.simple{padding-top:62px}.topbar.simple .back{top:18px;transform:none;left:18px}.topbar.simple .logo{height:40px}}

.badgegrid{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:12px}.bigvalue{font-size:34px;font-weight:900;color:var(--blue);letter-spacing:-.03em}.hint{font-size:13px;color:var(--muted);line-height:1.45}.formula{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;background:#f5f5f7;border:1px solid var(--line);border-radius:14px;padding:12px;color:#3a3a3c;overflow:auto}.unitrow{display:grid;grid-template-columns:1fr 160px;gap:10px}
@media(max-width:640px){.unitrow{grid-template-columns:1fr}}

/* v6 : interface encore plus épurée, sans sous-titres */
.homecard{min-height:145px;display:flex;flex-direction:column;justify-content:center}
.hero{padding-bottom:10px}
.hero h1{margin-bottom:0}