:root{--bg:#f4fbf7;--card:#ffffff;--border:#cbd5e1;--text:#0f172a;--text-mut:#64748b;--emerald:#059669;--emerald-dark:#064e3b;--amber:#d97706;--crimson:#e11d48}
*{box-sizing:border-box;margin:0;padding:0;font-family:system-ui,-apple-system,sans-serif}
body{background:var(--bg);color:var(--text);min-height:100vh;padding:1.5rem 1rem;background-image:radial-gradient(circle at 10% 10%,rgba(5,150,105,.04) 0%,transparent 40%),radial-gradient(circle at 90% 90%,rgba(217,119,6,.04) 0%,transparent 40%);display:flex;justify-content:center}
main{width:100%;max-width:950px;display:flex;flex-direction:column;gap:1.2rem}
header{display:flex;justify-content:space-between;align-items:center;border-bottom:2px solid var(--border);padding-bottom:.8rem}
.lg h1{font-size:1.4rem;font-weight:800;color:var(--emerald-dark)}
.lg p{font-size:.75rem;color:var(--text-mut);font-weight:600}
.grid{display:grid;grid-template-columns:1fr;gap:1.2rem}
@media (min-width:768px){.grid{grid-template-columns:340px 1fr}}
.card{background:var(--card);border:1.5px solid var(--border);border-radius:10px;padding:1.2rem;display:flex;flex-direction:column;gap:1rem;box-shadow:0 2px 8px rgba(0,0,0,.03);animation:slideDown .3s ease-out}
.card-title{font-size:.9rem;font-weight:800;border-bottom:1px solid var(--border);padding-bottom:.5rem;text-transform:uppercase;color:var(--emerald-dark);display:flex;justify-content:space-between;align-items:center}
@keyframes slideDown{from{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:translateY(0)}}
.ig{display:flex;flex-direction:column;gap:.4rem}
.il{font-size:.7rem;color:var(--text-mut);font-weight:700;text-transform:uppercase}
.iw{display:flex;align-items:center;background:#f8fafc;border:1.5px solid var(--border);border-radius:6px;padding:.3rem .6rem;width:100%;transition:border-color .2s}
.iw:focus-within{border-color:var(--emerald)}
.iw input{background:transparent;border:none;color:var(--text);width:100%;font-size:.9rem;font-weight:700;outline:none}
.unit-bar,.strength-bar{display:flex;gap:.3rem;background:#f1f5f9;border:1px solid var(--border);border-radius:99px;padding:.2rem;width:fit-content}
.btn-unit,.btn-strength{background:transparent;border:none;padding:.35rem .75rem;font-size:.7rem;font-weight:700;color:var(--text-mut);border-radius:99px;cursor:pointer;transition:all .2s ease}
.btn-unit.active,.btn-strength.active{background:var(--emerald);color:#fff;box-shadow:0 1px 3px rgba(0,0,0,.1)}
.preset-pills{display:flex;gap:.3rem;flex-wrap:wrap}
.btn-preset{background:#f1f5f9;border:1px solid var(--border);color:var(--text);padding:.25rem .5rem;font-size:.7rem;font-weight:700;border-radius:99px;cursor:pointer;transition:all .2s}
.btn-preset:hover{background:var(--emerald);color:#fff}
.btn{border:none;border-radius:6px;padding:.65rem 1rem;color:#fff;font-size:.85rem;font-weight:700;cursor:pointer;display:inline-flex;align-items:center;justify-content:center;gap:.4rem;transition:transform .15s,opacity .2s}
.btn-primary{background:var(--emerald)}
.btn-primary:hover{opacity:.9;transform:translateY(-1px)}
.btn-fresh{background:transparent;border:1px solid var(--border);color:var(--text-mut);padding:.35rem .7rem;font-size:.75rem;border-radius:6px;cursor:pointer}
.btn-fresh:hover{background:#f8fafc;color:var(--crimson)}
.result-display-panel{background:linear-gradient(135deg,#064e3b,#047857);border-radius:10px;padding:1.2rem;color:#fff;text-align:center;display:flex;flex-direction:column;gap:.8rem;box-shadow:0 4px 12px rgba(6,78,59,.2)}
.result-grid{display:grid;grid-template-columns:1fr 1fr;gap:1rem}
.res-box{background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.2);border-radius:8px;padding:.8rem}
.res-val{font-size:1.8rem;font-weight:900;color:#fef08a}
.res-lbl{font-size:.7rem;font-weight:700;text-transform:uppercase;color:#a7f3d0;margin-top:.2rem}
.res-formula{font-size:.8rem;color:#e2e8f0;font-weight:600;line-height:1.4;border-top:1px solid rgba(255,255,255,.15);padding-top:.6rem}
.log-grid{display:flex;flex-direction:column;gap:.5rem;max-height:240px;overflow-y:auto}
.log-item-row{display:flex;justify-content:space-between;align-items:center;background:#f8fafc;border:1px solid var(--border);border-radius:8px;padding:.65rem .8rem;font-size:.8rem}
.log-info{display:flex;align-items:center;gap:.4rem;font-weight:700;color:var(--text)}
.log-meta{display:flex;align-items:center;gap:.8rem;color:var(--text-mut);font-size:.75rem}
.btn-del{background:transparent;border:none;font-size:.85rem;cursor:pointer;color:var(--text-mut)}
.btn-del:hover{color:var(--crimson)}
.field-error{background:#fef2f2;border:1px solid #fca5a5;border-radius:6px;padding:.4rem .6rem;font-size:.7rem;color:var(--crimson);font-weight:700;display:none}
.recalc-spinner{font-size:.8rem;opacity:0;transition:opacity .2s}
.recalc-spinner.active{opacity:1}
.empty-placeholder{color:var(--text-mut);font-size:.8rem;font-style:italic;text-align:center;margin-top:1rem}
.test-widget{position:fixed;bottom:1rem;right:1rem;background:var(--card);border:1.5px solid var(--border);border-radius:8px;padding:.75rem;max-width:250px;box-shadow:0 4px 15px rgba(0,0,0,.1);z-index:1000;font-size:.7rem;display:block}
.test-title{font-weight:800;border-bottom:1px solid var(--border);padding-bottom:.3rem;margin-bottom:.4rem;color:var(--text);display:flex;justify-content:space-between}
.test-line{display:flex;justify-content:space-between;margin-bottom:.2rem}
.test-ok{color:var(--emerald);font-weight:700}
.test-fail{color:var(--crimson);font-weight:700}
footer{font-size:.65rem;color:var(--text-mut);border-top:1.5px solid var(--border);padding-top:.6rem;display:flex;justify-content:space-between;align-items:center;margin-top:.5rem}