:root {
  --bg: #e0f2fe;
  --card: #ffffff;
  --card-soft: #f0f9ff;
  --border: #cbd5e1;

  --primary: #0ea5e9;
  --primary-strong: #0369a1;

  --text: #0f172a;
  --muted: #64748b;

  --radius: 16px;
}

/* =========================
   BASE
========================= */

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 960px;
  margin: auto;
  padding: 2rem 1.5rem;
}

/* =========================
   BREADCRUMB
========================= */

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8rem;
  margin-bottom: 1.5rem;
  color: var(--muted);
}

.breadcrumb a {
  color: var(--primary-strong);
  text-decoration: none;
  font-weight: 500;
}

.breadcrumb a:hover {
  text-decoration: underline;
}

/* =========================
   HEADER
========================= */

.app-header {
  margin-bottom: 2rem;
}

.app-header h1 {
  margin: 0 0 0.4rem 0;
  font-size: 1.8rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.subtitle {
  color: var(--muted);
  font-size: 0.95rem;
}

/* =========================
   PANELS / CARDS
========================= */

.panel {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  margin-top: 2rem;
  box-shadow:
    0 4px 12px rgba(2, 132, 199, 0.04),
    0 1px 2px rgba(15, 23, 42, 0.05);
  transition: box-shadow .2s ease, transform .2s ease;
}

.panel:hover {
  box-shadow:
    0 8px 22px rgba(2, 132, 199, 0.06),
    0 2px 6px rgba(15, 23, 42, 0.06);
  transform: translateY(-2px);
}

.panel h2 {
  margin-top: 0;
  font-size: 1.2rem;
  font-weight: 600;
}

fieldset {
  border: none;
  margin: 0 0 28px 0;
  padding: 0;
}

/* =========================
   FORM
========================= */

label {
  display: block;
  margin-top: 14px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--muted);
}

input {
  width: 100%;
  padding: 12px;
  border-radius: 12px;
  background: #ffffff;
  border: 1px solid var(--border);
  color: var(--text);
  margin-top: 6px;
  font-size: 0.95rem;
  transition: border-color .2s ease, box-shadow .2s ease;
}

input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(14,165,233,.15);
}

/* =========================
   BUTTON
========================= */

button {
  width: 100%;
  margin-top: 18px;
  padding: 14px;
  background: linear-gradient(
    180deg,
    var(--primary),
    var(--primary-strong)
  );
  border: none;
  border-radius: 14px;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  color: white;
  transition: transform .15s ease, box-shadow .2s ease;
}

button:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(14,165,233,.35);
}

button:active {
  transform: translateY(0);
}

/* =========================
   RESULTADOS
========================= */

.result {
  margin-top: 16px;
  margin-bottom: 8px;
  font-weight: 600;
  font-size: 1rem;
  color: var(--primary-strong);
}

.note {
  margin-top: 8px;
  margin-bottom: 20px;
  padding: 14px;
  background: var(--card-soft);
  border-left: 4px solid var(--primary);
  border-radius: 12px;
  font-size: 0.85rem;
  color: var(--muted);
}

/* =========================
   FOOTER
========================= */

footer {
  text-align: center;
  padding: 3rem 1.5rem;
  font-size: 0.85rem;
  color: var(--muted);
  border-top: 1px solid var(--border);
  margin-top: 4rem;
}

.footer-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.footer-nav a {
  color: var(--primary-strong);
  text-decoration: none;
  font-weight: 500;
}

.footer-nav a:hover {
  text-decoration: underline;
}

/* =========================
   LANGUAGE SWITCHER
========================= */

.language-switcher {
  text-align: right;
  font-size: 0.85rem;
  margin-bottom: 1.25rem;
  color: var(--muted);
}

.language-switcher a {
  color: var(--primary-strong);
  text-decoration: none;
  margin-left: 0.4rem;
}

.language-switcher a:hover {
  text-decoration: underline;
}


.seo-panel details {
  margin-top: 2rem;
  padding: 1rem 1.2rem;
  border-radius: 14px;
  background: rgba(255,255,255,0.03);
}

.seo-panel summary {
  cursor: pointer;
  font-weight: 600;
  font-size: 1rem;
}

.seo-panel h2,
.seo-panel h3 {
  margin-top: 1rem;
}