:root {
  --color-primary: #1d4ed8;
  --color-primary-dark: #1739a8;
  --color-primary-light: #e4ecf7;
  --color-dark: #111827;
  --color-text: #374151;
  --color-muted: #6b7280;
  --color-bg: #ffffff;
  --color-bg-alt: #f5f6f8;
  --color-border: #e5e7eb;
  --color-success: #157347;
  --color-error: #c8102e;
  --font-base: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --radius: 10px;
  --shadow: 0 4px 16px rgba(17, 24, 39, 0.08);
  --container-width: 1180px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: var(--font-base);
  color: var(--color-text);
  background: var(--color-bg-alt);
  line-height: 1.55;
}

h1, h2, h3 { color: var(--color-dark); margin: 0 0 0.5em; }
h1 { font-size: 1.7rem; }
h2 { font-size: 1.25rem; }
h3 { font-size: 1.05rem; }
p { margin: 0 0 1em; }
a { color: var(--color-primary); text-decoration: none; }
a:hover, a:focus { text-decoration: underline; }

.container { max-width: var(--container-width); margin: 0 auto; padding: 0 20px; }

.btn {
  display: inline-block;
  padding: 0.6em 1.2em;
  border-radius: var(--radius);
  font-weight: 600;
  border: 2px solid transparent;
  cursor: pointer;
  font-size: 0.95rem;
}
.btn:hover, .btn:focus { text-decoration: none; }
.btn-primary { background: var(--color-primary); color: #fff; }
.btn-primary:hover, .btn-primary:focus { background: var(--color-primary-dark); color: #fff; }
.btn-secondary { background: transparent; color: var(--color-dark); border-color: var(--color-border); }
.btn-secondary:hover, .btn-secondary:focus { border-color: var(--color-primary); color: var(--color-primary); }
.btn-danger { background: var(--color-error); color: #fff; }
.btn-sm { padding: 0.4em 0.9em; font-size: 0.85rem; }

.app-header { background: var(--color-dark); color: #fff; }
.app-header-inner { display: flex; align-items: center; justify-content: space-between; height: 60px; flex-wrap: wrap; gap: 8px; }
.app-header .logo { color: #fff; font-weight: 700; }
.app-nav { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.app-nav a { color: #cbd2dc; font-weight: 500; font-size: 0.92rem; }
.app-nav a:hover, .app-nav a:focus { color: #fff; }
.app-main { padding: 32px 0 64px; }

.link-button { background: none; border: none; padding: 0; color: inherit; font: inherit; cursor: pointer; text-decoration: underline; }
.link-button.danger { color: var(--color-error); }
.logout-form { display: inline; }

.auth-panel { max-width: 420px; margin: 60px auto; background: #fff; border: 1px solid var(--color-border); border-radius: var(--radius); padding: 32px; }
.auth-form .form-group { margin-bottom: 16px; }
.auth-secondary { margin-top: 16px; font-size: 0.9rem; color: var(--color-muted); }

.page-heading { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 16px; margin-bottom: 20px; }

.dashboard-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 16px; margin: 20px 0; }
.dashboard-card { display: block; background: #fff; border: 1px solid var(--color-border); border-radius: var(--radius); padding: 20px; text-align: center; }
.dashboard-card h2 { font-size: 2rem; color: var(--color-primary); margin-bottom: 0.2em; }
.dashboard-card p { color: var(--color-muted); margin: 0; }
.dashboard-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 16px; }

.table-wrap { overflow-x: auto; background: #fff; border: 1px solid var(--color-border); border-radius: var(--radius); margin-bottom: 24px; }
.data-table { width: 100%; border-collapse: collapse; min-width: 640px; }
.data-table th, .data-table td { text-align: left; padding: 10px 14px; border-bottom: 1px solid var(--color-border); font-size: 0.9rem; }
.data-table th { background: var(--color-bg-alt); font-weight: 600; color: var(--color-dark); }
.data-table tfoot td { border-top: 2px solid var(--color-border); border-bottom: none; background: var(--color-bg-alt); }
.table-actions { display: flex; gap: 10px; white-space: nowrap; }

.badge { display: inline-block; padding: 0.2em 0.7em; border-radius: 999px; font-size: 0.78rem; font-weight: 600; text-transform: capitalize; }
.badge-borrador, .badge-pendiente { background: #fdf1d6; color: #92600a; }
.badge-enviado { background: #e4ecf7; color: #1d4ed8; }
.badge-aceptado, .badge-pagada { background: #e3f6ea; color: #157347; }
.badge-rechazado, .badge-anulada, .badge-vencida { background: #fbe1e4; color: #a10d24; }

.admin-form, .filter-form { background: #fff; border: 1px solid var(--color-border); border-radius: var(--radius); padding: 20px; margin-bottom: 24px; }
.filter-form { display: flex; align-items: flex-end; gap: 14px; flex-wrap: wrap; }
.filter-form .form-group { margin-bottom: 0; }
.form-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 14px; }
.form-group-wide { grid-column: 1 / -1; }
.form-group { margin-bottom: 14px; }
.form-group label { display: block; font-weight: 600; margin-bottom: 5px; color: var(--color-dark); font-size: 0.9rem; }
.form-group input, .form-group select, .form-group textarea {
  width: 100%; padding: 0.55em 0.75em; border: 1px solid var(--color-border); border-radius: 8px; font: inherit; background: #fff;
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus { outline: 2px solid var(--color-primary); outline-offset: 1px; }
.field-hint { display: block; font-size: 0.82rem; color: var(--color-muted); margin-top: 4px; }

.form-status { margin-top: 12px; font-weight: 600; }
.form-status.error { color: var(--color-error); }
.form-status.success { color: var(--color-success); }

.lineas-table input, .lineas-table select { min-width: 70px; }
.lineas-table td { vertical-align: top; padding: 6px; }
.lineas-table input[name="descripcion"] { min-width: 220px; }

.resumen-totales { max-width: 320px; margin-left: auto; background: #fff; border: 1px solid var(--color-border); border-radius: var(--radius); padding: 16px 20px; }
.resumen-totales p { display: flex; justify-content: space-between; margin: 0 0 6px; font-size: 0.9rem; }
.resumen-totales .total-final { font-size: 1.2rem; font-weight: 700; color: var(--color-dark); border-top: 1px solid var(--color-border); padding-top: 8px; margin-top: 8px; }

@media (max-width: 720px) {
  .app-nav { width: 100%; flex-direction: column; align-items: flex-start; gap: 8px; padding-bottom: 10px; }
}