:root {
  --bg: #f4f6f9;
  --card: #ffffff;
  --ink: #1f2733;
  --muted: #6b7688;
  --line: #e5e9f0;
  --brand: #2563eb;
  --brand-dark: #1d4ed8;
  --green: #16a34a;
  --red: #dc2626;
  --amber: #d97706;
  --radius: 10px;
  --shadow: 0 1px 3px rgba(16,24,40,.08), 0 1px 2px rgba(16,24,40,.04);
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--ink);
  font-size: 15px;
}
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }

/* Layout */
.app { display: flex; min-height: 100vh; }
.sidebar {
  width: 220px; background: #0f172a; color: #cbd5e1;
  display: flex; flex-direction: column; padding: 18px 0;
  position: sticky; top: 0; height: 100vh;
}
.brand { font-weight: 700; font-size: 18px; color: #fff; padding: 0 20px 18px; }
.sidebar nav { display: flex; flex-direction: column; flex: 1; }
.sidebar nav a {
  color: #cbd5e1; padding: 11px 20px; font-weight: 500;
}
.sidebar nav a:hover { background: #1e293b; color: #fff; text-decoration: none; }
.sidebar nav a.active { background: var(--brand); color: #fff; }
.sidebar-foot { padding: 16px 20px 0; border-top: 1px solid #1e293b; }
.who { font-size: 13px; margin-bottom: 8px; color: #e2e8f0; }
.who small { color: #94a3b8; text-transform: capitalize; }

.content { flex: 1; min-width: 0; }
.topbar {
  background: var(--card); border-bottom: 1px solid var(--line);
  padding: 16px 28px; position: sticky; top: 0; z-index: 5;
}
.topbar h1 { margin: 0; font-size: 20px; }
.page { padding: 24px 28px; }

/* Cards */
.card {
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow);
  margin-bottom: 20px;
}
.card h2 { margin-top: 0; font-size: 17px; }

/* Stat grid */
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 16px; margin-bottom: 24px; }
.stat {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 18px 20px; box-shadow: var(--shadow);
}
.stat .label { color: var(--muted); font-size: 13px; margin-bottom: 6px; }
.stat .value { font-size: 26px; font-weight: 700; }
.stat .value.green { color: var(--green); }
.stat .value.red { color: var(--red); }
.stat .value.amber { color: var(--amber); }

/* Tables */
table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 11px 12px; border-bottom: 1px solid var(--line); }
th { font-size: 12px; text-transform: uppercase; letter-spacing: .03em; color: var(--muted); }
tbody tr:hover { background: #f8fafc; }
td.num, th.num { text-align: right; }
.table-card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); }

/* Buttons */
.btn {
  display: inline-block; padding: 8px 14px; border-radius: 8px; border: 1px solid var(--line);
  background: var(--card); color: var(--ink); font-size: 14px; cursor: pointer; font-weight: 500;
}
.btn:hover { background: #f1f5f9; text-decoration: none; }
.btn-primary { background: var(--brand); border-color: var(--brand); color: #fff; }
.btn-primary:hover { background: var(--brand-dark); }
.btn-danger { color: var(--red); border-color: #f0c4c4; }
.btn-danger:hover { background: #fef2f2; }
.btn-sm { padding: 5px 10px; font-size: 13px; }
.btn-block { width: 100%; }
button.link { background: none; border: none; color: #94a3b8; cursor: pointer; padding: 0; font-size: 14px; }
button.link:hover { color: #fff; text-decoration: underline; }

/* Forms */
form label { display: block; margin-bottom: 14px; font-size: 14px; font-weight: 500; }
input, select, textarea {
  width: 100%; padding: 9px 11px; border: 1px solid var(--line); border-radius: 8px;
  font-size: 14px; font-family: inherit; margin-top: 5px; background: #fff;
}
input:focus, select:focus, textarea:focus { outline: 2px solid var(--brand); border-color: var(--brand); }
textarea { resize: vertical; min-height: 70px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-actions { display: flex; gap: 10px; margin-top: 8px; }

/* Toolbar (search + new) */
.toolbar { display: flex; justify-content: space-between; align-items: center; gap: 12px; margin-bottom: 18px; flex-wrap: wrap; }
.toolbar form { display: flex; gap: 8px; margin: 0; }
.toolbar input, .toolbar select { margin: 0; width: auto; }

/* Badges */
.badge { display: inline-block; padding: 3px 9px; border-radius: 999px; font-size: 12px; font-weight: 600; }
.badge.pendiente { background: #fef3c7; color: #92400e; }
.badge.pagada { background: #dcfce7; color: #166534; }
.badge.anulada { background: #f1f5f9; color: #64748b; }

.alert { background: #fef2f2; color: var(--red); border: 1px solid #fecaca; padding: 10px 12px; border-radius: 8px; margin-bottom: 14px; font-size: 14px; }
.muted { color: var(--muted); }
.right { text-align: right; }
.mt { margin-top: 18px; }

/* Login */
.login-body { display: flex; align-items: center; justify-content: center; min-height: 100vh; background: #0f172a; }
.login-card { background: #fff; padding: 32px; border-radius: 14px; width: 340px; box-shadow: 0 10px 40px rgba(0,0,0,.3); }
.login-brand { font-size: 22px; font-weight: 700; text-align: center; margin-bottom: 22px; }

/* Factura view */
.doc { max-width: 720px; }
.doc-head { display: flex; justify-content: space-between; margin-bottom: 20px; }
.totales { margin-left: auto; width: 280px; }
.totales .row { display: flex; justify-content: space-between; padding: 6px 0; }
.totales .grand { border-top: 2px solid var(--ink); font-weight: 700; font-size: 18px; margin-top: 6px; padding-top: 10px; }

@media print {
  .sidebar, .topbar, .no-print { display: none !important; }
  .page { padding: 0; }
  .app { display: block; }
}

@media (max-width: 720px) {
  .sidebar { width: 60px; }
  .brand, .who, .sidebar nav a span { display: none; }
  .form-row { grid-template-columns: 1fr; }
}