/* ========= RESET BÁSICO ========= */
* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
               Roboto, Ubuntu, Cantarell, "Helvetica Neue", Arial, sans-serif;
  background-color: #0b1220;
  color: #e5e7eb;
  line-height: 1.7;
}

/* ========= LAYOUT ========= */
header {
  background: #020617;
  border-bottom: 1px solid #1e293b;
  padding: 1.5rem;
}

header h1 {
  margin: 0;
  font-size: 1.8rem;
}

header p {
  margin: 0.3rem 0 1rem;
  color: #94a3b8;
}

nav {
  margin-top: 1rem;
}

nav a {
  margin-right: 1rem;
  font-weight: 500;
}

/* ========= CONTEÚDO ========= */
main {
  max-width: 1000px;
  margin: auto;
  padding: 2.5rem 2rem;
}

/* ========= LINKS ========= */
a {
  color: #38bdf8;
  text-decoration: none;
}

a:hover {
  color: #7dd3fc;
  text-decoration: underline;
}

a:visited {
  color: #60a5fa;
}

/* ========= TÍTULOS ========= */
h1, h2, h3 {
  color: #f8fafc;
  letter-spacing: -0.02em;
}

h2 {
  margin-top: 2.5rem;
  border-bottom: 1px solid #1e293b;
  padding-bottom: 0.4rem;
}

/* ========= BLOCOS MD ========= */
blockquote {
  background: #020617;
  border-left: 4px solid #38bdf8;
  padding: 1rem 1.2rem;
  margin: 1.5rem 0;
  color: #cbd5f5;
}

/* ========= TABELAS ========= */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.8rem 0;
  font-size: 0.95rem;
}

thead {
  background-color: #020617;
}

th, td {
  padding: 0.7rem 0.9rem;
  border: 1px solid #1e293b;
  vertical-align: top;
}

th {
  text-align: left;
  color: #e2e8f0;
  font-weight: 600;
}

tbody tr:nth-child(even) {
  background-color: #020617;
}

/* ========= CÓDIGO ========= */
code {
  background: #020617;
  padding: 0.12rem 0.35rem;
  border-radius: 4px;
  font-size: 0.9em;
}

/* ========= FOOTER LINK ========= */
.back-link {
  margin-top: 3rem;
  display: block;
}

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

footer {
  margin-top: 4rem;
  padding: 1.5rem 2rem;
  border-top: 1px solid #1e293b;
  background-color: #020617;
  text-align: center;
}

footer p {
  margin: 0;
  font-size: 0.9rem;
  color: #94a3b8;
}

footer a {
  color: #38bdf8;
  text-decoration: none;
  font-weight: 500;
}

footer a:hover {
  color: #7dd3fc;
  text-decoration: underline;
}

/* ========= CARDS CURSOS ========= */

.card {
  background: #020617;
  border: 1px solid #1e293b;
  border-radius: 10px;
  padding: 1.4rem 1.6rem;
  margin: 1.5rem 0;
}

.card-header {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: start;
  gap: 0.75rem;
}

.card-header h4 {
  margin: 0;
  font-size: 1.05rem;
}

.badge {
  font-size: 0.75rem;
  padding: 0.2rem 0.6rem;
  border-radius: 6px;
  font-weight: 600;
}

.badge.paid {
  background: #7c2d12;
  color: #fed7aa;
}

.badge.free {
  background: #14532d;
  color: #bbf7d0;
}

.badge.freetier {
  background: #fbbf24;
  color: #78350f;
}

.card-meta {
  margin: 0.6rem 0 1rem;
  color: #94a3b8;
  font-size: 0.85rem;
}

.card-footer {
  margin-top: 1.2rem;
}

.card-footer a {
  display: inline-block;
  font-weight: 600;
  color: #38bdf8;
  text-decoration: none;
}

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

.card-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));

  column-gap: 1.5rem; /* esquerda ↔ direita */
  row-gap: 0rem;    /* cima ↕ baixo */
}

@media (max-width: 900px) {
  .card-grid {
    grid-template-columns: 1fr;
  }
}