:root {
  --color-primary: #0284c7; /* Azul celeste / Navy blue */
  --color-primary-light: #38bdf8;
  --color-primary-dark: #0369a1;
  --color-bg: #f8fafc;
  --color-surface: #ffffff;
  --color-text-main: #1e293b;
  --color-text-muted: #64748b;
  --color-border: #e2e8f0;
  --color-success: #10b981;
  --color-error: #ef4444;
  --font-base: 'Inter', 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --radius-md: 8px;
  --radius-lg: 12px;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-base);
  background-color: var(--color-bg);
  color: var(--color-text-main);
  line-height: 1.5;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.15s ease;
}

a:hover {
  color: var(--color-primary-dark);
}

/* Header */
.site-header {
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-shadow: var(--shadow-sm);
}

.logo-container {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--color-primary-dark);
}

.logo-icon {
  color: var(--color-primary);
}

.nav-links {
  display: flex;
  gap: 1.5rem;
}

.nav-links a {
  color: var(--color-text-muted);
  font-weight: 500;
}

.nav-links a:hover, .nav-links a.active {
  color: var(--color-primary);
}

/* Main Content */
.main-content {
  flex: 1;
  padding: 3rem 1rem;
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
}

/* Footer */
.site-footer {
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: 2rem;
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.875rem;
  margin-top: auto;
}

/* Typography */
h1, h2, h3 {
  color: var(--color-text-main);
  margin-bottom: 1rem;
  font-weight: 700;
}

p {
  margin-bottom: 1rem;
  color: var(--color-text-muted);
}

/* Cards & Surfaces */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-md);
}

/* Forms & Inputs */
.form-group {
  margin-bottom: 1.5rem;
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text-main);
  margin-bottom: 0.5rem;
}

.form-control {
  width: 100%;
  padding: 0.75rem 1rem;
  font-family: inherit;
  font-size: 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  outline: none;
  transition: all 0.2s ease;
  background-color: #f8fafc;
}

.form-control:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(2, 132, 199, 0.15);
  background-color: #fff;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
  font-weight: 600;
  font-family: inherit;
  border-radius: var(--radius-md);
  cursor: pointer;
  border: none;
  transition: all 0.2s ease;
}

.btn-primary {
  background-color: var(--color-primary);
  color: white;
}

.btn-primary:hover {
  background-color: var(--color-primary-dark);
}

.btn-outline {
  background-color: transparent;
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
}

.btn-outline:hover {
  background-color: rgba(2, 132, 199, 0.05);
}

/* Search Box */
.search-box {
  display: flex;
  gap: 0.5rem;
  max-width: 500px;
  margin: 0 auto;
}

.search-box .form-control {
  flex: 1;
}

/* Alerts */
.alert {
  padding: 1rem;
  border-radius: var(--radius-md);
  margin-bottom: 1rem;
  font-weight: 500;
}
.alert-success { background-color: #d1fae5; color: #065f46; border: 1px solid #a7f3d0; }
.alert-error { background-color: #fee2e2; color: #991b1b; border: 1px solid #fecaca; }

/* Table */
.data-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 1.5rem;
  background: white;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.data-table th, .data-table td {
  padding: 1rem;
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

.data-table th {
  background-color: #f1f5f9;
  font-weight: 600;
  color: var(--color-text-main);
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 0.05em;
}

.data-table tr:hover {
  background-color: #f8fafc;
}

.badge {
  display: inline-flex;
  padding: 0.25rem 0.75rem;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 600;
}

.badge-blue {
  background-color: #e0f2fe;
  color: #0369a1;
}

/* Validation Result */
.validation-result {
  max-width: 600px;
  margin: 0 auto;
  text-align: center;
}

.icon-large {
  width: 64px;
  height: 64px;
  margin-bottom: 1rem;
}

.status-valid .icon-large { color: var(--color-success); }
.status-invalid .icon-large { color: var(--color-error); }

.detail-list {
  text-align: left;
  margin-top: 2rem;
  border-top: 1px solid var(--color-border);
  padding-top: 1.5rem;
}

.detail-item {
  display: flex;
  margin-bottom: 1rem;
  padding-bottom: 1rem;
  border-bottom: 1px dashed var(--color-border);
}

.detail-label {
  font-weight: 600;
  width: 150px;
  flex-shrink: 0;
  color: var(--color-text-muted);
}

.detail-value {
  font-weight: 500;
  color: var(--color-text-main);
}