*, *::before, *::after { box-sizing: border-box; }

:root {
  --azul: #1a3a6b;
  --gold: #b5860d;
  --verde: #22c55e;
  --vermelho: #ef4444;
  --bg: #f5f4f0;
  --card: #ffffff;
  --surface2: #f0ede6;
  --border: #d4cfc5;
  --text: #1a1814;
  --text-muted: #7a756e;
  --mono: 'IBM Plex Mono', monospace;
  --display: 'Playfair Display', serif;
}

body {
  margin: 0;
  font-family: 'IBM Plex Sans', sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  line-height: 1.6;
}

/* HEADER */
.site-header {
  background: var(--azul);
  border-bottom: 3px solid var(--gold);
  padding: 0 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
  gap: 1rem;
}
.header-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}
.header-logo img { height: 36px; width: auto; }
.header-logo-text {
  font-family: var(--display);
  color: #fff;
  font-size: 1.1rem;
  white-space: nowrap;
}
.header-badge {
  font-family: var(--mono);
  font-size: 0.68rem;
  color: rgba(255,255,255,0.7);
  border: 1px solid rgba(255,255,255,0.2);
  padding: 3px 10px;
  border-radius: 2px;
  letter-spacing: 0.08em;
}
.header-back {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: rgba(255,255,255,0.8);
  text-decoration: none;
  padding: 5px 12px;
  border: 1px solid rgba(255,255,255,0.25);
  border-radius: 4px;
  transition: background 0.15s;
  white-space: nowrap;
}
.header-back:hover { background: rgba(255,255,255,0.1); }

/* LAYOUT */
.page {
  max-width: 900px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

/* PAGE TITLE */
.page-title {
  margin: 0 0 4px;
  font-family: var(--display);
  font-size: 2rem;
  font-weight: 700;
  color: var(--azul);
  line-height: 1.2;
}
.page-subtitle {
  margin: 0 0 2rem;
  font-size: 1rem;
  color: var(--text-muted);
}

/* SECTION */
.tut-section {
  margin-bottom: 3rem;
}
.tut-section h2 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--azul);
  margin: 0 0 1rem;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--border);
  font-family: 'IBM Plex Sans', sans-serif;
}

/* CARDS */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1rem;
}
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-left: 3px solid var(--gold);
  border-radius: 8px;
  padding: 1.1rem 1.2rem;
}
.card h3 {
  margin: 0 0 8px;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--azul);
}
.card p {
  margin: 0 0 6px;
  font-size: 0.88rem;
  color: var(--text-muted);
}
.card p:last-child { margin-bottom: 0; }

/* CODE BLOCKS */
code {
  font-family: var(--mono);
  font-size: 0.82rem;
  background: var(--surface2);
  color: var(--azul);
  padding: 1px 6px;
  border-radius: 3px;
  border: 1px solid var(--border);
}
pre {
  background: var(--azul);
  color: #e8e4dc;
  font-family: var(--mono);
  font-size: 0.82rem;
  line-height: 1.7;
  padding: 1rem 1.2rem;
  border-radius: 6px;
  overflow-x: auto;
  margin: 0.75rem 0;
}
pre .comment { color: #9ab; }
pre .kw { color: var(--gold); font-weight: 600; }

/* EXAMPLE BLOCK */
.example-block {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  margin-bottom: 1.2rem;
}
.example-header {
  background: var(--surface2);
  border-bottom: 1px solid var(--border);
  padding: 8px 14px;
  font-family: var(--mono);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.example-body { padding: 1rem 1.2rem; }
.example-body pre { margin: 0; border-radius: 4px; }

/* STEP LIST */
.step-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}
.step-list li {
  display: flex;
  gap: 12px;
  align-items: flex-start;
}
.step-num {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--azul);
  color: white;
  font-size: 0.72rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 1px;
}
.step-text { font-size: 0.9rem; color: var(--text); }

/* VECTOR LEGEND */
.vector-legend {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
  margin-top: 0.5rem;
}
.vector-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
}
.v-dot {
  width: 12px;
  height: 12px;
  border-radius: 2px;
  flex-shrink: 0;
}

/* SHORTCUT TABLE */
.shortcut-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
}
.shortcut-table th {
  background: var(--surface2);
  text-align: left;
  padding: 8px 12px;
  font-weight: 700;
  font-size: 0.78rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 1px solid var(--border);
}
.shortcut-table td {
  padding: 8px 12px;
  border-bottom: 1px solid var(--border);
  color: var(--text);
  vertical-align: top;
}
.shortcut-table tr:last-child td { border-bottom: none; }
.shortcut-table td:first-child {
  font-family: var(--mono);
  white-space: nowrap;
  color: var(--azul);
  font-weight: 600;
}
.shortcut-table tr:hover td { background: var(--surface2); }

/* CTA */
.cta {
  text-align: center;
  padding: 2.5rem;
  background: var(--azul);
  border-radius: 10px;
  color: white;
}
.cta h2 { font-family: var(--display); font-size: 1.4rem; margin: 0 0 8px; }
.cta p { margin: 0 0 1.2rem; color: rgba(255,255,255,0.8); font-size: 0.95rem; }
.cta a {
  display: inline-block;
  background: var(--gold);
  color: #1a1814;
  text-decoration: none;
  padding: 10px 28px;
  border-radius: 6px;
  font-weight: 700;
  font-size: 0.95rem;
  transition: opacity 0.15s;
}
.cta a:hover { opacity: 0.88; }

@media (max-width: 600px) {
  .page { padding: 1.2rem 1rem 3rem; }
  .page-title { font-size: 1.5rem; }
  .card-grid { grid-template-columns: 1fr; }
  .site-header { padding: 0 1rem; }
  .header-badge { display: none; }
}