:root{--bg: #0f1420;--surface: #171e2e;--surface-2: #1f2940;--border: #2a3550;--text: #e8ecf4;--text-dim: #9aa5b8;--accent: #4f9cf9;--accent-strong: #2f7de1;--good: #3ecf8e;--warn: #f5b455;--bad: #ef6a6a;--radius: 12px;--max-width: 960px}*{box-sizing:border-box}html{color-scheme:dark}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text);line-height:1.55;min-height:100vh;display:flex;flex-direction:column}main{flex:1;width:100%;max-width:var(--max-width);margin:0 auto;padding:1.5rem 1rem 3rem}a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}.site-header{border-bottom:1px solid var(--border);padding:1rem}.site-header .inner{max-width:var(--max-width);margin:0 auto;display:flex;align-items:baseline;gap:.75rem}.site-header h1{font-size:1.15rem;margin:0}.site-header .tagline{color:var(--text-dim);font-size:.85rem}.site-footer{border-top:1px solid var(--border);padding:1rem;color:var(--text-dim);font-size:.8rem;text-align:center}.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:1rem;margin-top:1.5rem}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:1.25rem;display:block;color:inherit;transition:border-color .15s ease,transform .15s ease}.card:hover{border-color:var(--accent);text-decoration:none;transform:translateY(-2px)}.card h2{margin:0 0 .5rem;font-size:1.05rem}.card p{margin:0;color:var(--text-dim);font-size:.9rem}.page-title{margin:0 0 .25rem;font-size:1.5rem}.page-subtitle{margin:0 0 1.5rem;color:var(--text-dim);font-size:.95rem}form.calculator{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:1.5rem}.field-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:1rem}label{display:block;font-size:.85rem;margin-bottom:.3rem;color:var(--text-dim)}input[type=number],select{width:100%;padding:.6rem .7rem;border-radius:8px;border:1px solid var(--border);background:var(--surface-2);color:var(--text);font-size:1rem}input[type=number]:focus,select:focus{outline:2px solid var(--accent);outline-offset:1px;border-color:transparent}.hint{font-size:.75rem;color:var(--text-dim);margin-top:.25rem}button[type=submit]{margin-top:1.25rem;width:100%;padding:.75rem;font-size:1rem;font-weight:600;color:#fff;background:var(--accent-strong);border:none;border-radius:8px;cursor:pointer;transition:filter .15s ease}button[type=submit]:hover{filter:brightness(1.15)}.error-banner{display:none;margin-top:1rem;padding:.75rem 1rem;border-radius:8px;background:#ef6a6a1f;border:1px solid var(--bad);color:var(--bad);font-size:.9rem}.error-banner.visible{display:block}.result{margin-top:1.5rem;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:1.5rem}.result .headline{display:flex;align-items:center;gap:1rem;flex-wrap:wrap;margin-bottom:1rem}.result .bfp{font-size:2.5rem;font-weight:700;margin:0}.badge{padding:.3rem .75rem;border-radius:999px;font-size:.8rem;font-weight:600;border:1px solid}.badge.cat-esencial{color:var(--accent);border-color:var(--accent)}.badge.cat-atletas,.badge.cat-fitness{color:var(--good);border-color:var(--good)}.badge.cat-promedio{color:var(--warn);border-color:var(--warn)}.badge.cat-obesidad{color:var(--bad);border-color:var(--bad)}.result dl{display:grid;grid-template-columns:max-content 1fr;gap:.5rem 1.25rem;margin:0}.result dt{color:var(--text-dim);font-size:.9rem}.result dd{margin:0;font-weight:600}.history{margin-top:1.5rem}.history h2{font-size:1.1rem;margin:0 0 .75rem;display:flex;align-items:center;justify-content:space-between;gap:1rem}.history .clear-btn{background:none;border:none;color:var(--text-dim);font-size:.8rem;cursor:pointer;text-decoration:underline;padding:0}.history .clear-btn:hover{color:var(--bad)}.history-list{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:.5rem}.history-item{display:flex;align-items:center;justify-content:space-between;gap:1rem;background:var(--surface);border:1px solid var(--border);border-radius:8px;padding:.75rem 1rem;font-size:.9rem}.history-item .meta{color:var(--text-dim);font-size:.8rem}.history-item .value{font-weight:700;white-space:nowrap}.history-item .delete-btn{background:none;border:none;color:var(--text-dim);cursor:pointer;font-size:1rem;padding:.2rem .4rem}.history-item .delete-btn:hover{color:var(--bad)}.empty-state{color:var(--text-dim);font-size:.9rem;padding:1rem;text-align:center;border:1px dashed var(--border);border-radius:8px}