@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@300;400;500;700&family=Syne:wght@400;600;800&display=swap');

:root {
  --bg:        #0c0e13;
  --bg-card:   #12151c;
  --bg-card2:  #181b23;
  --border:    #222733;
  --border-hi: #363d52;
  --accent:    #4af08a;
  --accent-dim:#1a3d2c;
  --text:      #b8bdd0;
  --text-dim:  #4e5568;
  --text-hi:   #e8ecf5;
  --mono:      'JetBrains Mono', monospace;
  --ui:        'Syne', sans-serif;
  --r:         5px;
  --glow:      0 0 22px rgba(74,240,138,0.13);
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--mono);
  min-height: 100vh;
  overflow-x: hidden;
}

.bg-grid {
  position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background-image:
    linear-gradient(rgba(74,240,138,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(74,240,138,0.025) 1px, transparent 1px);
  background-size: 48px 48px;
}
.scanlines {
  position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background: repeating-linear-gradient(
    0deg, transparent, transparent 3px,
    rgba(0,0,0,0.04) 3px, rgba(0,0,0,0.04) 4px
  );
}

/* ── TOPBAR ── */
.topbar {
  position: relative; z-index: 10;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 2rem;
  height: 54px;
  border-bottom: 1px solid var(--border);
  background: rgba(12,14,19,0.97);
}
.topbar-logo {
  display: flex; align-items: center; gap: .5rem;
  font-family: var(--ui);
  font-weight: 800;
  font-size: 1.1rem;
  color: var(--text-hi);
}
.logo-icon { color: var(--accent); font-size: 1.3rem; }
.topbar-links { display: flex; gap: .75rem; }
.nav-link {
  font-size: .75rem;
  color: var(--text-dim);
  text-decoration: none;
  letter-spacing: .04em;
  padding: .25rem .1rem;
  border-bottom: 1px solid transparent;
  transition: color .15s, border-color .15s;
}
.nav-link:hover { color: var(--text); border-color: var(--border-hi); }
.nav-link.active { color: var(--accent); border-color: var(--accent); }

/* ── MAIN ── */
.main-wrapper {
  position: relative; z-index: 5;
  max-width: 740px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem 6rem;
}

/* ── PAGE HEADER ── */
.page-header {
  margin-bottom: 2rem;
}
.page-tag {
  display: inline-block;
  font-size: .6rem;
  letter-spacing: .14em;
  color: var(--accent);
  border: 1px solid var(--accent-dim);
  padding: .12rem .4rem;
  border-radius: 3px;
  background: rgba(74,240,138,0.04);
  margin-bottom: .75rem;
}
.page-title {
  font-family: var(--ui);
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--text-hi);
  margin-bottom: .3rem;
}
.page-sub {
  font-size: .75rem;
  color: var(--text-dim);
  letter-spacing: .04em;
}

/* ── CARDS ── */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--r);
  padding: 1.75rem 1.75rem 2rem;
  margin-bottom: 1.2rem;
}
.card-header {
  display: flex; align-items: center; gap: .7rem;
  margin-bottom: 1.2rem;
}
.card-tag {
  font-size: .6rem;
  letter-spacing: .12em;
  color: var(--accent);
  border: 1px solid var(--accent-dim);
  padding: .12rem .4rem;
  border-radius: 3px;
  background: rgba(74,240,138,0.04);
}
.card-title {
  font-family: var(--ui);
  font-size: .95rem;
  font-weight: 600;
  color: var(--text-hi);
}
.card-text {
  font-size: .78rem;
  line-height: 1.85;
  color: var(--text);
}
.card-text.mt { margin-top: .9rem; }

.card-list {
  margin-top: .9rem;
  padding-left: 1.2rem;
  display: flex; flex-direction: column; gap: .4rem;
}
.card-list li {
  font-size: .78rem;
  color: var(--text);
  line-height: 1.6;
  list-style: none;
  padding-left: .5rem;
  position: relative;
}
.card-list li::before {
  content: '▸';
  position: absolute; left: -.8rem;
  color: var(--accent);
  font-size: .65rem;
}

/* ── STEPS ── */
.step-block {
  padding-top: 1.4rem;
  margin-top: 1.4rem;
  border-top: 1px solid var(--border);
}
.step-block:first-of-type { border-top: none; padding-top: 0; margin-top: 0; }

.step-num {
  display: inline-block;
  font-size: .62rem;
  letter-spacing: .1em;
  color: var(--accent);
  margin-bottom: .35rem;
}
.step-title {
  font-family: var(--ui);
  font-size: .85rem;
  font-weight: 600;
  color: var(--text-hi);
  margin-bottom: .75rem;
}

/* ── CODE BOX ── */
.code-box {
  background: #090b10;
  border: 1px solid var(--border);
  border-radius: var(--r);
  padding: 1rem 1.2rem;
  margin-top: .75rem;
  overflow-x: auto;
}
.code-box pre {
  font-family: var(--mono);
  font-size: .76rem;
  line-height: 1.8;
  color: #7dd3a8;
  white-space: pre;
}

.inline-code {
  font-family: var(--mono);
  font-size: .74rem;
  color: var(--accent);
  background: rgba(74,240,138,0.06);
  border: 1px solid var(--accent-dim);
  padding: .05rem .3rem;
  border-radius: 3px;
}

/* ── BOTÓN VOLVER ── */
.btn-back {
  display: inline-flex; align-items: center;
  margin-top: 1.2rem;
  font-size: .78rem;
  color: var(--accent);
  text-decoration: none;
  letter-spacing: .03em;
  border-bottom: 1px solid transparent;
  transition: border-color .15s;
}
.btn-back:hover { border-color: var(--accent); }

/* ── FOOTER ── */
.footer {
  position: relative; z-index: 5;
  text-align: center;
  padding: 1.2rem 2rem;
  border-top: 1px solid var(--border);
  font-size: .64rem;
  color: var(--text-dim);
  letter-spacing: .05em;
}
.footer-sep { margin: 0 .5rem; opacity: .3; }

/* ── RESPONSIVE ── */
@media (max-width: 560px) {
  .main-wrapper { padding: 1.5rem 1rem 4rem; }
  .topbar { padding: 0 1rem; }
  .card { padding: 1.25rem 1rem 1.5rem; }
  .page-title { font-size: 1.3rem; }
}