:root{
  --bg:#ffffff;
  --bg-soft:#eef8f9;
  --card:#f8fcfc;
  --border:#dfeced;
  --text:#101819;
  --text-dim:#63767a;
  --accent:#0e99a3;
  --accent-dim:#0b7980;
  --ok:#1a9e6b;
  --warn:#b8791f;
  --danger:#c8402f;
  --radius:10px;
}
html[data-theme="dark"]{
  --bg:#0b1414;
  --bg-soft:#101f1f;
  --card:#132323;
  --border:#1f3636;
  --text:#eaf6f6;
  --text-dim:#8aa5a5;
  --accent:#22d0da;
  --accent-dim:#1aa8b0;
  --ok:#33c17a;
  --warn:#e2a63b;
  --danger:#e2543b;
}
*{box-sizing:border-box}
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  font-size:15px;
  line-height:1.45;
}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
.app{min-height:100vh;display:flex;flex-direction:column}
.topbar{
  display:flex;align-items:center;gap:24px;
  padding:14px 24px;background:var(--bg-soft);
  border-bottom:1px solid var(--border);
  flex-wrap:wrap;
}
.brand{font-weight:800;font-size:20px;color:var(--text)}
.brand span{color:var(--accent)}
.nav{display:flex;gap:18px;flex:1;flex-wrap:wrap}
.nav a{color:var(--text-dim);font-weight:600;font-size:14px;padding:6px 2px;border-bottom:2px solid transparent}
.nav a:hover{color:var(--text);text-decoration:none}
.nav a.active{color:var(--text);border-bottom-color:var(--accent)}
.user-box{display:flex;align-items:center;gap:12px;color:var(--text-dim);font-size:14px}
.btn-link{color:var(--text-dim)}
.content{flex:1;padding:28px 24px;max-width:1100px;width:100%;margin:0 auto}
.footer{text-align:center;color:var(--text-dim);font-size:12px;padding:18px;border-top:1px solid var(--border)}

h1{font-size:22px;margin:0 0 18px}
h2{font-size:17px;margin:0 0 12px}
.subtitle{color:var(--text-dim);margin-top:-12px;margin-bottom:20px;font-size:14px}

.grid{display:grid;gap:16px}
.grid-4{grid-template-columns:repeat(4,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-2{grid-template-columns:repeat(2,1fr)}
@media (max-width:760px){.grid-4,.grid-3,.grid-2{grid-template-columns:1fr}}

.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:20px}
.stat{display:flex;flex-direction:column;gap:6px}
.stat .num{font-size:28px;font-weight:800}
.stat .label{color:var(--text-dim);font-size:13px}
.stat.warn .num{color:var(--warn)}

table{width:100%;border-collapse:collapse;font-size:14px}
th,td{padding:10px 8px;text-align:left;border-bottom:1px solid var(--border)}
th{color:var(--text-dim);font-weight:600;font-size:12px;text-transform:uppercase;letter-spacing:.03em}
tr:hover td{background:rgba(255,255,255,.02)}
.right{text-align:right}
.center{text-align:center}

.badge{display:inline-block;padding:2px 9px;border-radius:999px;font-size:12px;font-weight:600}
.badge-ok{background:rgba(51,193,122,.15);color:var(--ok)}
.badge-warn{background:rgba(226,166,59,.15);color:var(--warn)}
.badge-danger{background:rgba(226,84,59,.15);color:var(--danger)}
.badge-muted{background:rgba(154,160,176,.15);color:var(--text-dim)}

form label{display:block;font-size:13px;color:var(--text-dim);margin-bottom:5px;margin-top:14px;font-weight:600}
form label:first-child{margin-top:0}
input,select,textarea{
  width:100%;padding:10px 12px;border-radius:8px;
  border:1px solid var(--border);background:var(--bg-soft);color:var(--text);
  font-size:14px;font-family:inherit;
}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--accent)}
textarea{resize:vertical;min-height:70px}
.row{display:flex;gap:12px}
.row > *{flex:1}
.help{color:var(--text-dim);font-size:12px;margin-top:4px}

.btn{
  display:inline-block;padding:10px 18px;border-radius:8px;border:none;
  background:var(--accent);color:#fff;font-weight:700;font-size:14px;cursor:pointer;
  font-family:inherit;
}
.btn:hover{background:var(--accent-dim);text-decoration:none}
.btn-secondary{background:transparent;border:1px solid var(--border);color:var(--text)}
.btn-secondary:hover{border-color:var(--accent);background:transparent}
.btn-danger{background:transparent;border:1px solid var(--danger);color:var(--danger)}
.btn-danger:hover{background:rgba(226,84,59,.1)}
.btn-sm{padding:6px 12px;font-size:12px}
.actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:20px}

.flash{padding:12px 16px;border-radius:8px;margin-bottom:18px;font-size:14px;font-weight:600}
.flash-ok{background:rgba(51,193,122,.12);color:var(--ok);border:1px solid rgba(51,193,122,.3)}
.flash-error{background:rgba(226,84,59,.12);color:var(--danger);border:1px solid rgba(226,84,59,.3)}

.login-wrap{min-height:100vh;display:flex;align-items:center;justify-content:center}
.login-card{width:340px;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:32px}
.login-card h1{text-align:center}

.item-row{display:grid;grid-template-columns:2fr 1fr 1fr auto;gap:10px;align-items:end;margin-bottom:10px}
@media (max-width:700px){.item-row{grid-template-columns:1fr 1fr}}
.item-row-3{display:grid;grid-template-columns:2fr 1fr auto;gap:10px;align-items:end;margin-bottom:10px}
@media (max-width:700px){.item-row-3{grid-template-columns:1fr 1fr}}
.item-remove{background:transparent;border:1px solid var(--border);color:var(--danger);border-radius:8px;padding:9px 12px;cursor:pointer}

.calc-summary{display:flex;flex-direction:column;gap:8px;font-size:14px}
.calc-summary .line{display:flex;justify-content:space-between}
.calc-summary .total{font-size:20px;font-weight:800;border-top:1px solid var(--border);padding-top:10px;margin-top:6px}
.calc-summary .ganancia{color:var(--ok)}

.empty{color:var(--text-dim);text-align:center;padding:40px 0}

.theme-toggle{
  background:transparent;border:1px solid var(--border);border-radius:999px;
  width:34px;height:34px;display:inline-flex;align-items:center;justify-content:center;
  cursor:pointer;font-size:16px;line-height:1;color:var(--text-dim);flex-shrink:0;
}
.theme-toggle:hover{border-color:var(--accent);color:var(--accent)}
.theme-toggle::before{content:"🌙"}
html[data-theme="dark"] .theme-toggle::before{content:"☀️"}
.theme-toggle-fixed{position:fixed;top:16px;right:16px}