:root{--bg:#0f1419;--panel:#1a212b;--panel-2:#222b37;--line:#2c3744;--text:#e6edf3;--muted:#93a1b0;--accent:#ff6b3d;--accent-soft:#2a2018}*{box-sizing:border-box}body{background:var(--bg);color:var(--text);margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif}.state{text-align:center;color:var(--muted);padding:4rem}.layout{grid-template-columns:280px 1fr;min-height:100vh;display:grid}.sidebar{background:var(--panel);border-right:1px solid var(--line);padding:1.5rem 1rem}.sidebar h1{margin:0 0 1.5rem;padding:0 .5rem;font-size:1.15rem}.sidebar nav{flex-direction:column;gap:.25rem;display:flex}.nav{text-align:left;color:var(--text);cursor:pointer;background:0 0;border:none;border-radius:8px;flex-direction:column;align-items:flex-start;gap:.15rem;padding:.6rem .75rem;font-size:.95rem;display:flex}.nav:hover{background:var(--panel-2)}.nav.active{background:var(--accent-soft);box-shadow:inset 3px 0 0 var(--accent)}.nav-discipline{color:var(--muted);text-transform:uppercase;letter-spacing:.04em;font-size:.72rem}.content{justify-content:center;padding:2.5rem;display:flex}.calculator{width:100%;max-width:540px}.calculator h2{margin:0 0 .25rem}.description{color:var(--muted);margin:0 0 1.75rem}form{background:var(--panel);border:1px solid var(--line);border-radius:12px;flex-direction:column;gap:1rem;padding:1.5rem;display:flex}label{color:var(--muted);flex-direction:column;gap:.4rem;font-size:.9rem;display:flex}input,select{background:var(--bg);border:1px solid var(--line);color:var(--text);border-radius:8px;padding:.6rem .7rem;font-size:1rem}input:focus,select:focus{outline:2px solid var(--accent);border-color:#0000}button[type=submit]{background:var(--accent);color:#1a1008;cursor:pointer;border:none;border-radius:8px;margin-top:.5rem;padding:.7rem;font-size:1rem;font-weight:600}button[type=submit]:disabled{opacity:.6;cursor:progress}.error{color:#ff8a8a}.result{background:var(--panel);border:1px solid var(--line);border-radius:12px;margin-top:1.75rem;padding:1.5rem}.headline{margin:0;font-size:1.6rem;font-weight:700}.detail{color:var(--muted);margin:.25rem 0 0}table{border-collapse:collapse;width:100%;margin-top:1.25rem}td{border-top:1px solid var(--line);color:var(--muted);padding:.55rem 0}td.value{text-align:right;color:var(--text);font-variant-numeric:tabular-nums}.insight{background:var(--accent-soft);border:1px solid #3a2a1c;border-radius:10px;margin-top:1.5rem;padding:1rem 1.1rem}.insight-tag{letter-spacing:.06em;text-transform:uppercase;color:var(--accent);margin-bottom:.4rem;font-size:.7rem;font-weight:700;display:inline-block}.insight p{margin:0;line-height:1.55}@media (width<=720px){.layout{grid-template-columns:1fr}.sidebar{border-right:none;border-bottom:1px solid var(--line)}.content{padding:1.5rem}}