:root {
  --bg: #080c14;
  --bg2: #0d1220;
  --bg3: #111827;
  --card: #131c2e;
  --border: rgba(99,179,255,0.12);
  --accent-blue: #38bdf8;
  --accent-purple: #a78bfa;
  --accent-pink: #f472b6;
  --accent-cyan: #22d3ee;
  --accent-orange: #fb923c;
  --accent-green: #34d399;
  --text: #e2e8f0;
  --text-muted: #64748b;
  --text-dim: #94a3b8;
  --mono: 'Space Mono', monospace;
  --sans: 'DM Sans', sans-serif;
  --font-title: 'Syne', sans-serif;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.7;
  overflow-x: hidden;
  position: relative;
  isolation: isolate;
  min-height: 100vh;
}

/* ── NOISE overlay ── */
body::before {
  content: '';
  position: fixed; inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.03'/%3E%3C/svg%3E");
  pointer-events: none; z-index: -1; opacity: .4;
}

/* ── GRID bg ── */
body::after {
  content: '';
  position: fixed; inset: 0;
  background-image:
    linear-gradient(rgba(56,189,248,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(56,189,248,0.04) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none; z-index: -1;
}

/* ── NAV & HEADER ── */
.back-nav {
  max-width: 950px;
  margin: 0 auto;
  padding: 4rem 2rem 1rem;
}

.back-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border);
  color: var(--text-dim);
  padding: 8px 16px;
  border-radius: 12px;
  cursor: pointer;
  font-family: var(--mono);
  font-size: 13px;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  text-decoration: none;
}

.back-btn:hover {
  background: rgba(56, 189, 248, 0.08);
  color: var(--accent-blue);
  border-color: var(--accent-blue);
  transform: translateX(-4px);
}

header {
  padding: 2rem 2rem 2rem;
  display: flex; align-items: center; justify-content: space-between;
  border-bottom: 1px solid var(--border);
  max-width: 950px; margin: 0 auto;
}

.logo { display: flex; align-items: center; gap: 12px; }
.logo-mark {
  width: 44px; height: 44px;
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
  border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--mono); font-size: 18px; font-weight: 700; color: #fff;
}
.logo-text {
  font-family: var(--font-title); font-size: 22px; font-weight: 800;
  background: linear-gradient(90deg, var(--accent-blue), var(--accent-purple));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.badge-curso {
  font-family: var(--mono); font-size: 11px;
  color: var(--accent-cyan); border: 1px solid var(--accent-cyan);
  border-radius: 20px; padding: 4px 14px; letter-spacing: .05em;
  opacity: .8;
}

/* ── HERO ── */
.hero {
  text-align: center;
  padding: 5rem 2rem 3rem;
  max-width: 800px; margin: 0 auto;
}
.hero-tag {
  font-family: var(--mono); font-size: 12px; color: var(--accent-pink);
  letter-spacing: .15em; text-transform: uppercase;
  margin-bottom: 1.2rem; display: block;
}
.hero h1 {
  font-family: var(--font-title);
  font-size: clamp(2.4rem, 6vw, 4rem);
  font-weight: 800; line-height: 1.1; letter-spacing: -.02em;
  margin-bottom: 1.2rem;
}
.hero h1 span {
  background: linear-gradient(90deg, var(--accent-blue) 0%, var(--accent-purple) 50%, var(--accent-pink) 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero p {
  color: var(--text-dim); font-size: 1rem; max-width: 520px; margin: 0 auto 2rem;
}
.hero-pills { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; }
.pill {
  font-family: var(--mono); font-size: 11px; letter-spacing: .05em;
  padding: 5px 14px; border-radius: 20px; text-decoration: none;
  border: 1px solid; transition: all .2s;
}
.pill:hover { transform: translateY(-2px); }
.pill-blue  { color: var(--accent-blue);   border-color: rgba(56,189,248,.3);   background: rgba(56,189,248,.07); }
.pill-purple{ color: var(--accent-purple); border-color: rgba(167,139,250,.3); background: rgba(167,139,250,.07); }
.pill-cyan  { color: var(--accent-cyan);   border-color: rgba(34,211,238,.3);  background: rgba(34,211,238,.07); }
.pill-orange{ color: var(--accent-orange); border-color: rgba(251,146,60,.3);  background: rgba(251,146,60,.07); }
.pill-green { color: var(--accent-green);  border-color: rgba(52,211,153,.3);  background: rgba(52,211,153,.07); }
.pill-pink  { color: var(--accent-pink);   border-color: rgba(244,114,182,.3); background: rgba(244,114,182,.07); }

/* ── NAV STICKY ── */
.nav-sticky {
  position: sticky; top: 0; z-index: 50;
  background: rgba(8,12,20,.85); backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  padding: .6rem 2rem;
}
.nav-inner {
  max-width: 950px; margin: 0 auto;
  display: flex; gap: 6px; flex-wrap: wrap;
}
.nav-item {
  font-family: var(--mono); font-size: 11px; color: var(--text-muted);
  padding: 4px 12px; border-radius: 20px; text-decoration: none;
  transition: all .2s; border: 1px solid transparent;
}
.nav-item:hover { color: var(--text); border-color: var(--border); }

/* ── MAIN CONTENT ── */
main {
  max-width: 950px; margin: 0 auto;
  padding: 3rem 2rem 6rem;
}

.section { margin-bottom: 5rem; scroll-margin-top: 80px; }
.section-header {
  display: flex; align-items: center; gap: 16px; margin-bottom: 2rem;
  padding-bottom: 1rem; border-bottom: 1px solid var(--border);
}
.section-icon {
  width: 48px; height: 48px; border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  font-size: 22px; flex-shrink: 0;
}
.section-title {
  font-family: var(--font-title); font-size: 1.7rem; font-weight: 800;
  letter-spacing: -.02em;
}
.section-subtitle { color: var(--text-dim); font-size: .85rem; margin-top: 2px; }
.section-number {
  font-family: var(--mono); font-size: .75rem; color: var(--text-muted); margin-left: auto;
}

/* ── CARDS ── */
.cards-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 1rem;
}
.card {
  background: var(--card); border: 1px solid var(--border); border-radius: 16px;
  padding: 1.25rem 1.4rem; transition: border-color .2s, transform .2s;
  position: relative; overflow: hidden;
}
.card::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 2px; }
.card:hover { transform: translateY(-3px); }
.card-blue::before { background: linear-gradient(90deg, var(--accent-blue), transparent); }
.card-blue:hover { border-color: rgba(56,189,248,.3); }
.card-purple::before { background: linear-gradient(90deg, var(--accent-purple), transparent); }
.card-purple:hover { border-color: rgba(167,139,250,.3); }
.card-pink::before { background: linear-gradient(90deg, var(--accent-pink), transparent); }
.card-pink:hover { border-color: rgba(244,114,182,.3); }
.card-cyan::before { background: linear-gradient(90deg, var(--accent-cyan), transparent); }
.card-cyan:hover { border-color: rgba(34,211,238,.3); }
.card-orange::before { background: linear-gradient(90deg, var(--accent-orange), transparent); }
.card-orange:hover { border-color: rgba(251,146,60,.3); }
.card-green::before { background: linear-gradient(90deg, var(--accent-green), transparent); }
.card-green:hover { border-color: rgba(52,211,153,.3); }

.card-label { font-family: var(--mono); font-size: 11px; margin-bottom: .5rem; opacity: .7; }
.card-term { font-family: var(--font-title); font-size: 1.15rem; font-weight: 700; margin-bottom: .5rem; }
.card-def { font-size: .875rem; color: var(--text-dim); line-height: 1.6; }
.card-tag {
  display: inline-block; margin-top: .8rem; font-family: var(--mono); font-size: 10px;
  padding: 3px 10px; border-radius: 6px; background: rgba(255,255,255,.05); color: var(--text-muted);
}

/* ── CODE BLOCK ── */
.code-block {
  background: #060a10; border: 1px solid rgba(255,255,255,.07); border-radius: 12px;
  padding: 0.8rem 1.1rem; font-family: var(--mono); font-size: 11.5px;
  line-height: 1.6; overflow-x: auto; margin: 1rem 0; position: relative; white-space: pre;
}
.code-block .label { position: absolute; top: 10px; right: 14px; font-size: 10px; color: var(--text-muted); }
.kw  { color: #c792ea; }
.tag { color: #f07178; }
.attr{ color: #ffcb6b; }
.val { color: #c3e88d; }
.cm  { color: #546e7a; font-style: italic; }
.fn  { color: #82aaff; }
.str { color: #c3e88d; }
.num { color: #f78c6c; }
.op  { color: var(--accent-cyan); }

/* ── VISUALS ── */
.visual-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin-top: 1.5rem; }
@media (max-width: 700px) { .visual-row { grid-template-columns: 1fr; } }

.method-table { width: 100%; border-collapse: collapse; font-size: .875rem; }
.method-table th {
  font-family: var(--mono); font-size: .75rem; color: var(--text-muted); text-align: left;
  padding: .6rem 1rem; border-bottom: 1px solid var(--border);
}
.method-table td { padding: .8rem 1rem; border-bottom: 1px solid rgba(255,255,255,.04); }
.badge { font-family: var(--mono); font-size: 12px; font-weight: 700; padding: 3px 10px; border-radius: 6px; display: inline-block; }
.badge-get    { background: rgba(52,211,153,.15); color: #34d399; }
.badge-post   { background: rgba(56,189,248,.15); color: #38bdf8; }
.badge-put    { background: rgba(251,146,60,.15); color: #fb923c; }
.badge-delete { background: rgba(244,114,182,.15); color: #f472b6; }

.fw-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 1rem; margin-top: 1.2rem; }
.fw-card {
  background: var(--card); border: 1px solid var(--border); border-radius: 16px; padding: 1.4rem;
  text-align: center; transition: transform .2s; border-top: 2px solid transparent;
}
.fw-card:hover { transform: translateY(-4px); }
.fw-logo { font-size: 2.4rem; margin-bottom: .6rem; display: block; }
.fw-name { font-family: var(--font-title); font-size: 1.1rem; font-weight: 700; margin-bottom: .4rem; }
.fw-type { font-family: var(--mono); font-size: 10px; color: var(--text-muted); margin-bottom: .8rem; }
.fw-desc { font-size: .8rem; color: var(--text-dim); line-height: 1.5; }

.dom-tree {
  font-family: var(--mono); font-size: 13px; line-height: 2;
  background: #060a10; border: 1px solid var(--border); border-radius: 12px; padding: 1.4rem;
}
.depth-0 { color: var(--accent-blue); }
.depth-1 { color: var(--accent-purple); padding-left: 1.5rem; display: block; }
.depth-2 { color: var(--accent-cyan); padding-left: 3rem; display: block; }
.depth-3 { color: var(--accent-green); padding-left: 4.5rem; display: block; }

.callout { border-left: 3px solid; padding: .8rem 1.2rem; border-radius: 0 10px 10px 0; margin: 1rem 0; font-size: .875rem; }
.callout-blue  { border-color: var(--accent-blue);   background: rgba(56,189,248,.07); }
.callout-purple{ border-color: var(--accent-purple); background: rgba(167,139,250,.07); }
.callout-green { border-color: var(--accent-green);  background: rgba(52,211,153,.07); }
.callout-orange{ border-color: var(--accent-orange); background: rgba(251,146,60,.07); }

footer {
  text-align: center; padding: 2rem; border-top: 1px solid var(--border);
  font-family: var(--mono); font-size: 12px; color: var(--text-muted);
}
footer span { color: var(--accent-blue); }

.inline-tag {
  font-family: var(--mono); font-size: 12px; background: rgba(255,255,255,.06);
  border: 1px solid rgba(255,255,255,.1); padding: 1px 7px; border-radius: 5px; color: var(--accent-cyan);
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}
.section { animation: fadeUp .5s ease both; }
.section:nth-child(1) { animation-delay: .05s; }
.section:nth-child(2) { animation-delay: .1s; }
.section:nth-child(3) { animation-delay: .15s; }
.section:nth-child(4) { animation-delay: .2s; }
.section:nth-child(5) { animation-delay: .25s; }
.section:nth-child(6) { animation-delay: .3s; }
.section:nth-child(7) { animation-delay: .35s; }
.section:nth-child(8) { animation-delay: .4s; }