:root{--bg:#fbfaf6;--ink:#111;--card:#fff;--y:#ffd23f;--p:#8b6dff;--sh:#111;
box-sizing:border-box;padding-top:env(safe-area-inset-top,0px);padding-bottom:env(safe-area-inset-bottom,0px)}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){--bg:#121212;--ink:#f4f1e8;--card:#1c1c1c;--sh:#f4f1e8}}
:root[data-theme="dark"]{--bg:#121212;--ink:#f4f1e8;--card:#1c1c1c;--sh:#f4f1e8}
html{scroll-behavior:smooth;scroll-padding-top:env(safe-area-inset-top,0px)}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);font:17px/1.55 'Space Grotesk',system-ui,sans-serif}
a{color:inherit}
.w{max-width:1000px;margin:0 auto;padding:0 20px}
.m{font-family:'Space Mono',ui-monospace,monospace}
nav{display:flex;justify-content:space-between;align-items:center;padding:18px 0;border-bottom:3px solid var(--ink)}
nav b{font:700 22px 'Space Mono',monospace}
nav a.c{border:3px solid var(--ink);padding:6px 14px;text-decoration:none;font-weight:700;background:var(--y);color:#111;box-shadow:4px 4px 0 var(--sh)}
h1{font:700 clamp(42px,9vw,104px)/.95 'Space Grotesk';letter-spacing:-.04em;margin:50px 0 24px}
h1 mark{background:var(--y);color:#111;padding:0 .12em}
.sub{font-size:21px;max-width:600px}
.k{font:700 12px 'Space Mono',monospace;text-transform:uppercase;letter-spacing:.12em;background:var(--ink);color:var(--bg);padding:4px 10px;display:inline-block}
section{padding:64px 0}
h2{font:700 clamp(30px,5vw,52px)/1 'Space Grotesk';letter-spacing:-.03em;margin:16px 0 28px;max-width:720px}
.box{background:var(--card);border:3px solid var(--ink);box-shadow:8px 8px 0 var(--sh);padding:24px}
.calc{display:grid;grid-template-columns:1.3fr 1fr;gap:24px}
@media(max-width:760px){.calc{grid-template-columns:1fr}}
.it{display:flex;align-items:center;gap:12px;padding:10px 0;border-bottom:2px dashed color-mix(in srgb,var(--ink) 30%,transparent)}
.it label{flex:1;display:flex;gap:10px;align-items:center;cursor:pointer;font-weight:500}
.it input[type=checkbox]{width:22px;height:22px;accent-color:var(--p)}
.it input[type=number]{width:74px;font:700 15px 'Space Mono',monospace;padding:6px;border:2px solid var(--ink);background:var(--bg);color:var(--ink)}
.res{background:var(--p);color:#fff;border:3px solid var(--ink);padding:24px;display:flex;flex-direction:column;justify-content:center}
.res .n{font:700 clamp(48px,8vw,76px)/1 'Space Grotesk';letter-spacing:-.04em}
.res small{font:400 13px 'Space Mono',monospace;opacity:.9;display:block;margin-top:14px}
.swap{display:grid;gap:14px}
.sw{display:grid;grid-template-columns:1fr 40px 1fr;align-items:center;gap:10px}
.sw div{border:3px solid var(--ink);padding:14px 16px;background:var(--card)}
.sw .l{text-decoration:line-through;opacity:.6}
.sw .r{background:var(--y);color:#111;font-weight:700;box-shadow:4px 4px 0 var(--sh)}
.sw .r span{display:block;font:400 13px 'Space Mono',monospace}
.sw i{font:700 24px 'Space Mono';text-align:center;font-style:normal}
@media(max-width:620px){.sw{grid-template-columns:1fr}.sw i{transform:rotate(90deg)}}
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
@media(max-width:760px){.steps{grid-template-columns:1fr}}
.steps .box h3{margin:0 0 6px;font-size:24px}
.steps .box p{margin:0}
.steps .num{font:700 56px/1 'Space Mono';color:var(--p)}
form{display:grid;gap:14px;max-width:640px}
label.f{display:grid;gap:5px;font-weight:700;font-size:14px}
input.t,select,textarea{font:inherit;padding:12px;border:3px solid var(--ink);background:var(--card);color:var(--ink);width:100%}
.two{display:grid;grid-template-columns:1fr 1fr;gap:14px}@media(max-width:600px){.two{grid-template-columns:1fr}}
button{font:700 18px 'Space Grotesk';padding:15px;border:3px solid var(--ink);background:var(--y);color:#111;box-shadow:6px 6px 0 var(--sh);cursor:pointer}
button:active{transform:translate(4px,4px);box-shadow:2px 2px 0 var(--sh)}
footer{border-top:3px solid var(--ink);padding:24px 0 40px;font:12px 'Space Mono',monospace}

/* Classes remplaçant les anciens attributs style="..." (compatibles CSP) */
.note{margin-top:28px;font-size:14px}
.hp{display:none}
.status{font-size:14px;margin:0;font-weight:700}
.alt{font-size:13px}