:root {
  --bg: #f4f6fb;
  --card: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --danger: #dc2626;
  --border: #e5e7eb;
  --radius: 10px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---------- Navbar ---------- */
.navbar {
  background: var(--card);
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 1.5rem;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.brand { font-weight: 700; font-size: 1.1rem; color: var(--text); }
.nav-links { display: flex; align-items: center; gap: 1rem; }
.inline-form { display: inline; margin: 0; }

/* ---------- Layout ---------- */
.container { width: 100%; max-width: 960px; margin: 2rem auto; padding: 0 1rem; flex: 1; }
.footer { text-align: center; color: var(--muted); padding: 1.5rem; }
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  box-shadow: 0 1px 3px rgb(0 0 0 / 0.06);
}
.card.narrow { max-width: 480px; margin: 0 auto; }
.center { text-align: center; }
.hero { text-align: center; padding: 4rem 1rem; }
.hero h1 { font-size: 2.2rem; margin-bottom: 0.5rem; }
.hero p { color: var(--muted); margin-bottom: 1.5rem; }
.error-code { font-size: 4rem; margin: 0; color: var(--danger); }
.page-head { display: flex; justify-content: space-between; align-items: center; gap: 1rem; flex-wrap: wrap; }

/* ---------- Botones ---------- */
.btn {
  display: inline-block;
  background: var(--primary);
  color: #fff;
  border: 1px solid var(--primary);
  border-radius: 8px;
  padding: 0.55rem 1.1rem;
  font-size: 0.95rem;
  cursor: pointer;
  transition: background 0.15s;
}
.btn:hover { background: var(--primary-dark); text-decoration: none; }
.btn-sm { padding: 0.3rem 0.7rem; font-size: 0.85rem; }
.btn-block { width: 100%; margin-top: 0.5rem; }
.btn-outline { background: transparent; color: var(--primary); }
.btn-outline:hover { background: #eff6ff; }
.btn-danger { background: var(--danger); border-color: var(--danger); }
.btn-danger-outline { background: transparent; color: var(--danger); border: 1px solid var(--danger); border-radius: 8px; padding: 0.3rem 0.7rem; font-size: 0.85rem; }
.btn-danger-outline:hover { background: #fef2f2; text-decoration: none; }

/* ---------- Formularios ---------- */
.form-group { margin-bottom: 1rem; }
.form-group label { display: block; font-weight: 600; margin-bottom: 0.3rem; font-size: 0.9rem; }
.form-group input, .form-group textarea, .form-group select {
  width: 100%;
  padding: 0.55rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.95rem;
  font-family: inherit;
}
.form-group input:focus, .form-group textarea:focus, .form-group select:focus {
  outline: 2px solid var(--primary);
  outline-offset: 1px;
  border-color: var(--primary);
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.field-error { color: var(--danger); font-size: 0.82rem; display: block; margin-top: 0.25rem; }
.muted { color: var(--muted); font-size: 0.9rem; }

/* ---------- Flash ---------- */
.flash { border-radius: 8px; padding: 0.75rem 1rem; margin-bottom: 1rem; border: 1px solid; }
.flash-success { background: #ecfdf5; border-color: #10b981; color: #065f46; }
.flash-danger  { background: #fef2f2; border-color: #f87171; color: #991b1b; }
.flash-info    { background: #eff6ff; border-color: #60a5fa; color: #1e40af; }
.flash-warning { background: #fffbeb; border-color: #fbbf24; color: #92400e; }

/* ---------- Tabla ---------- */
.table-wrap { overflow-x: auto; background: var(--card); border-radius: var(--radius); border: 1px solid var(--border); }
.table { width: 100%; border-collapse: collapse; }
.table th, .table td { padding: 0.75rem 1rem; text-align: left; border-bottom: 1px solid var(--border); }
.table th { background: #f9fafb; font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.04em; color: var(--muted); }
.table tr:last-child td { border-bottom: none; }
.actions { display: flex; gap: 0.5rem; }

/* ---------- Badges ---------- */
.badge { border-radius: 999px; padding: 0.15rem 0.7rem; font-size: 0.78rem; font-weight: 600; }
.badge-pendiente   { background: #fef3c7; color: #92400e; }
.badge-en_progreso { background: #dbeafe; color: #1e40af; }
.badge-completada  { background: #d1fae5; color: #065f46; }
.prio { font-size: 0.85rem; }
.prio-alta  { color: var(--danger); font-weight: 600; }
.prio-media { color: #d97706; }
.prio-baja  { color: var(--muted); }

/* ---------- Filtros ---------- */
.filters { display: flex; gap: 0.5rem; margin: 1rem 0; flex-wrap: wrap; }
.filters a { padding: 0.3rem 0.8rem; border-radius: 999px; border: 1px solid var(--border); color: var(--text); font-size: 0.88rem; }
.filters a.active { background: var(--primary); color: #fff; border-color: var(--primary); }