:root{--bg:#0b1220;--surface:#111a2e;--border:#1f2a44;--text:#e6edf7;--muted:#94a3b8;--accent:#77bcf5;--accent-fg:#07111f;--danger:#f87171;--ok:#34d399;--warn:#fbbf24;--radius:12px}*{box-sizing:border-box}html,body{margin:0;padding:0}body{background:var(--bg);color:var(--text);min-height:100vh;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,system-ui,sans-serif;font-size:16px;line-height:1.5}main{max-width:640px;margin:0 auto;padding:32px 20px 80px}.nav{border-bottom:1px solid var(--border);background:var(--surface)}.nav ul{flex-wrap:wrap;gap:4px 20px;max-width:960px;margin:0 auto;padding:14px 20px;list-style:none;display:flex}.nav a{color:var(--muted);border-radius:6px;padding:6px 10px;font-size:14px;text-decoration:none;transition:background 80ms,color 80ms}.nav a:hover{color:var(--text);background:#ffffff0a}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:32px}h1{letter-spacing:-.01em;margin:0 0 8px;font-size:24px}h2{margin:0 0 12px;font-size:18px}.lead{color:var(--muted);margin:0 0 24px}.form{flex-direction:column;gap:20px;display:flex}fieldset{border:0;gap:20px;margin:0;padding:0;display:flex}legend{color:var(--muted);margin-bottom:8px;padding:0;font-size:14px}.radio{cursor:pointer;align-items:center;gap:8px;font-size:15px;display:inline-flex}.radio input{accent-color:var(--accent)}.field{flex-direction:column;gap:8px;display:flex}.field span{color:var(--muted);font-size:14px}input[type=text]{background:var(--bg);border:1px solid var(--border);color:var(--text);letter-spacing:.02em;border-radius:8px;padding:12px 14px;font-family:inherit;font-size:16px}input[type=text]:focus{outline:2px solid var(--accent);outline-offset:1px;border-color:#0000}button[type=submit],button.pagar{background:var(--accent);color:var(--accent-fg);cursor:pointer;border:0;border-radius:8px;padding:12px 16px;font-family:inherit;font-size:15px;font-weight:600}button[type=submit]:disabled,button.pagar:disabled{opacity:.5;cursor:not-allowed}.error{color:var(--danger);background:#f871711a;border:1px solid #f871714d;border-radius:8px;margin:20px 0 0;padding:12px 14px;font-size:14px}.resultado{border-top:1px solid var(--border);margin-top:28px;padding-top:28px}.resultado header{margin-bottom:16px}.muted{color:var(--muted);margin:0;font-size:14px}code{background:var(--bg);border-radius:4px;padding:2px 6px;font-family:SF Mono,Menlo,Consolas,monospace;font-size:.92em}.lista-facturas{flex-direction:column;gap:16px;margin:0;padding:0;list-style:none;display:flex}.factura{background:var(--bg);border:1px solid var(--border);border-radius:8px;padding:20px}dl{grid-template-columns:1fr 1fr;gap:12px 24px;margin:0;display:grid}dl>div{flex-direction:column;gap:2px;display:flex}dt{color:var(--muted);text-transform:uppercase;letter-spacing:.04em;font-size:12px}dd{margin:0;font-size:15px}dd.valor{font-size:18px;font-weight:600}.estado{text-transform:uppercase;letter-spacing:.04em;border-radius:999px;padding:2px 10px;font-size:12px;font-weight:600;display:inline-block}.estado-por_pagar{color:var(--warn);background:#fbbf2426}.estado-pagado{color:var(--ok);background:#34d39926}.estado-anulado{color:var(--muted);background:#94a3b826}.pagar{width:100%;margin-top:16px}