*{box-sizing:border-box}
:root{--panel:#fff;--text:#0f172a;--muted:#5b6b85;--blue:#3164e6;--line:#e5e7eb;--soft:#f8fafc;--green:#15803d;--red:#dc2626;--purple:#4b136b}
body{margin:0;min-height:100vh;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;background:radial-gradient(circle at top,#17294a 0%,#0f1b33 55%,#09101f 100%);display:flex;justify-content:center;padding:20px;color:var(--text)}
.app{width:100%;max-width:430px;padding-top:env(safe-area-inset-top)}
.header,.card,.solution{background:var(--panel);border-radius:24px;padding:20px;box-shadow:0 18px 50px rgba(0,0,0,.20);margin-bottom:14px}
.header{border-radius:30px;padding:24px}
.logo-wrap{width:82px;height:82px;border-radius:22px;background:linear-gradient(135deg,#0f1b33,#1b2f57);display:flex;align-items:center;justify-content:center;padding:8px;margin-bottom:16px;box-shadow:0 12px 30px rgba(15,27,51,.25)}
.logo-img{max-width:100%;max-height:100%;object-fit:contain;display:block}
h1{margin:0;font-size:30px}
p{margin:8px 0 0;color:var(--muted)}
label{font-weight:800;display:block;margin-bottom:8px}
#largeur{width:100%;font-size:32px;padding:16px;border-radius:18px;border:2px solid #b9c9ff;outline:none}
#largeur:focus{border-color:var(--blue);box-shadow:0 0 0 4px rgba(49,100,230,.13)}
.hint{font-size:13px;color:var(--muted);margin-top:10px}
.checks-title{font-weight:900;margin-top:18px;margin-bottom:10px}
.checks{display:grid;gap:10px}
.check{display:flex;align-items:center;gap:12px;background:var(--soft);border:1px solid var(--line);border-radius:16px;padding:14px;font-weight:800}
.check input{width:24px;height:24px;accent-color:var(--purple)}
.hidden{display:none}
.solution{border:2px solid transparent}
.solution.best{border-color:var(--green)}
.solution h2{display:flex;justify-content:space-between;gap:12px;margin:0 0 12px;font-size:20px}
.badge{font-size:12px;padding:6px 9px;border-radius:999px;background:#dcfce7;color:var(--green);font-weight:900}
.badge.alt{background:#f3e8ff;color:var(--purple)}
.rows{background:var(--soft);border:1px solid var(--line);border-radius:18px;padding:12px}
.row{display:flex;justify-content:space-between;gap:14px;padding:6px 0;font-size:17px}
.value{font-weight:900;text-align:right}
.good{color:var(--green)}
.sep{height:1px;background:var(--line);margin:10px 0}
.chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}
.chip{background:#f3e8ff;color:var(--purple);border-radius:10px;padding:7px 10px;font-weight:900}
.error{background:#fef2f2;color:var(--red);border:1px solid #fecaca;border-radius:18px;padding:14px;font-weight:800;line-height:1.35}