:root{
  --bg:#0b0f19;
  --bg-alt:#0e1320;
  --surface:#141a29;
  --surface-2:#1c2436;
  --border:#2a3348;
  --text:#e7eaf3;
  --text-muted:#9aa4bd;
  --text-faint:#6b7590;
  --primary:#6f6bf0;
  --primary-2:#22d3ee;
  --primary-grad:linear-gradient(135deg,#6f6bf0 0%,#22d3ee 100%);
  --success:#34d399;
  --warning:#fbbf24;
  --danger:#f87171;
  --radius:14px;
  --radius-sm:8px;
  --shadow:0 10px 30px -10px rgba(0,0,0,.5);
  --header-h:64px;
}
*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  line-height:1.55;
  -webkit-font-smoothing:antialiased;
}
body.menu-open{overflow:hidden;}
a{color:inherit;text-decoration:none;}
img,svg{display:block;max-width:100%;}
ul{margin:0;padding:0;list-style:none;}
h1,h2,h3,h4,p{margin:0;}
button{font:inherit;color:inherit;background:none;border:none;cursor:pointer;}
.container{max-width:1200px;margin:0 auto;padding:0 24px;}
.container-narrow{max-width:800px;margin:0 auto;padding:0 24px;}
.muted{color:var(--text-muted);}
.accent{background:var(--primary-grad);-webkit-background-clip:text;background-clip:text;color:transparent;}
.badge{
  display:inline-flex;align-items:center;gap:6px;
  padding:5px 12px;border-radius:999px;
  background:var(--surface-2);border:1px solid var(--border);
  font-size:12.5px;color:var(--text-muted);font-weight:600;letter-spacing:.02em;
}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 22px;border-radius:10px;font-weight:600;font-size:15px;
  cursor:pointer;transition:transform .15s ease, box-shadow .15s ease, background .15s ease;
  border:1px solid transparent;
}
.btn:active{transform:translateY(1px);}
.btn-primary{background:var(--primary-grad);color:#0a0d16;}
.btn-primary:hover{box-shadow:0 8px 24px -6px rgba(111,107,240,.55);}
.btn-ghost{background:var(--surface-2);border-color:var(--border);color:var(--text);}
.btn-ghost:hover{border-color:var(--primary);}
.btn-sm{padding:9px 16px;font-size:13.5px;}

/* ---------- Header ---------- */
.site-header{
  position:fixed;top:0;left:0;right:0;height:var(--header-h);
  display:flex;align-items:center;
  background:rgba(11,15,25,.75);
  backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);
  border-bottom:1px solid var(--border);
  z-index:200;
}
.site-header .container{display:flex;align-items:center;justify-content:space-between;width:100%;}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:19px;letter-spacing:-.01em;}
.logo-mark{
  width:32px;height:32px;border-radius:9px;background:var(--primary-grad);
  display:flex;align-items:center;justify-content:center;color:#0a0d16;font-weight:900;font-size:14px;
  flex:none;font-family:"SFMono-Regular",Consolas,"Liberation Mono",Menlo,monospace;
}
.header-actions{display:flex;align-items:center;gap:14px;}
.header-actions .btn{display:none;}
@media (min-width:640px){ .header-actions .btn{display:inline-flex;} }

.menu-toggle{
  position:relative;width:42px;height:42px;border-radius:10px;
  background:var(--surface-2);border:1px solid var(--border);
  display:flex;align-items:center;justify-content:center;
  flex:none;
}
.menu-toggle:hover{border-color:var(--primary);}
.menu-toggle .bars{position:relative;width:18px;height:13px;}
.menu-toggle .bars span{
  position:absolute;left:0;right:0;height:2px;border-radius:2px;background:var(--text);
  transition:transform .25s ease, opacity .2s ease, top .25s ease;
}
.menu-toggle .bars span:nth-child(1){top:0;}
.menu-toggle .bars span:nth-child(2){top:5.5px;}
.menu-toggle .bars span:nth-child(3){top:11px;}
.menu-toggle[aria-expanded="true"] .bars span:nth-child(1){top:5.5px;transform:rotate(45deg);}
.menu-toggle[aria-expanded="true"] .bars span:nth-child(2){opacity:0;}
.menu-toggle[aria-expanded="true"] .bars span:nth-child(3){top:5.5px;transform:rotate(-45deg);}

/* ---------- Overlay + Side drawer ---------- */
.overlay{
  position:fixed;inset:0;background:rgba(4,6,12,.6);
  opacity:0;pointer-events:none;transition:opacity .25s ease;z-index:210;
}
.overlay.show{opacity:1;pointer-events:auto;}

.side-menu{
  position:fixed;top:0;right:0;bottom:0;
  width:min(84vw,320px);
  background:var(--surface);border-left:1px solid var(--border);
  box-shadow:-20px 0 50px -20px rgba(0,0,0,.6);
  transform:translateX(100%);
  transition:transform .3s cubic-bezier(.32,.72,0,1);
  z-index:220;display:flex;flex-direction:column;
}
.side-menu.open{transform:translateX(0);}
.side-menu-head{
  display:flex;align-items:center;justify-content:space-between;
  padding:16px 20px;border-bottom:1px solid var(--border);height:var(--header-h);
}
.side-menu-head span{font-weight:800;font-size:16px;}
.close-btn{
  width:36px;height:36px;border-radius:9px;background:var(--surface-2);
  border:1px solid var(--border);display:flex;align-items:center;justify-content:center;
  font-size:18px;line-height:1;
}
.close-btn:hover{border-color:var(--primary);color:var(--primary-2);}
.side-menu nav{flex:1;overflow-y:auto;padding:10px 10px;}
.side-menu nav a{
  display:flex;align-items:center;gap:12px;
  text-align:left;justify-content:flex-start;
  padding:13px 14px;border-radius:10px;font-size:15.5px;font-weight:600;
  color:var(--text-muted);
}
.side-menu nav a .ico{width:18px;text-align:center;color:var(--text-faint);flex:none;font-family:"SFMono-Regular",Consolas,"Liberation Mono",Menlo,monospace;}
.side-menu nav a:hover{background:var(--surface-2);color:var(--text);}
.side-menu nav a.active{background:var(--surface-2);color:var(--text);}
.side-menu nav a.active .ico{color:var(--primary-2);}
.side-menu-foot{padding:16px 20px;border-top:1px solid var(--border);}
.side-menu-foot .btn{margin-bottom:10px;}

/* ---------- Layout / sections ---------- */
main{padding-top:var(--header-h);}
section.block{padding:64px 0;}
section.block.tight{padding:44px 0;}
.section-head{max-width:640px;margin:0 0 36px;}
.section-head.center{margin-inline:auto;text-align:center;}
.section-head h1,.section-head h2{font-size:clamp(24px,3.4vw,34px);font-weight:800;letter-spacing:-.02em;margin-top:10px;}
.section-head p{margin-top:12px;font-size:16px;color:var(--text-muted);}

/* Hero */
.hero{position:relative;padding:88px 0 60px;overflow:hidden;}
.hero::before{
  content:"";position:absolute;top:-160px;right:-120px;width:520px;height:520px;border-radius:50%;
  background:radial-gradient(circle,rgba(111,107,240,.35),transparent 70%);filter:blur(10px);z-index:0;
}
.hero::after{
  content:"";position:absolute;bottom:-200px;left:-120px;width:480px;height:480px;border-radius:50%;
  background:radial-gradient(circle,rgba(34,211,238,.22),transparent 70%);filter:blur(10px);z-index:0;
}
.hero .container{position:relative;z-index:1;}
.hero-flex{display:flex;align-items:center;justify-content:space-between;gap:48px;}
.hero-inner{max-width:600px;flex:1 1 auto;}
.hero-side{flex:0 0 380px;display:flex;flex-direction:column;align-items:stretch;padding-top:6px;}
@media (max-width:960px){
  .hero-flex{flex-direction:column;}
  .hero-side{flex:none;width:100%;order:-1;padding-top:0;}
}
.hero h1{font-size:clamp(30px,5vw,48px);font-weight:800;letter-spacing:-.03em;line-height:1.12;}
.hero p.lead{margin-top:18px;font-size:17.5px;color:var(--text-muted);max-width:560px;}
.hero-cta{display:flex;gap:14px;margin-top:30px;flex-wrap:wrap;}
.hero-badges{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:22px;}

/* ---------- Hero tip (editor recomendado) ---------- */
.hero-tip{margin:0;}
.hero-tip-body{padding:24px 22px 26px;}
.hero-tip-icon{
  width:46px;height:46px;border-radius:12px;background:var(--surface-2);
  display:flex;align-items:center;justify-content:center;font-size:21px;margin-bottom:16px;
}
.hero-tip-body h3{font-size:17px;font-weight:800;margin-bottom:10px;}
.hero-tip-body p{color:var(--text-muted);font-size:14px;margin-bottom:16px;}
.hero-tip-btn{width:100%;margin-top:6px;}
@media (max-width:960px){
  .hero-tip{max-width:420px;margin:0 auto;}
}

/* Grids / cards */
.grid{display:grid;gap:20px;}
.grid-3{grid-template-columns:repeat(3,1fr);}
.grid-2{grid-template-columns:repeat(2,1fr);}
@media (max-width:920px){ .grid-3{grid-template-columns:repeat(2,1fr);} }
@media (max-width:640px){ .grid-3,.grid-2{grid-template-columns:1fr;} }

.card{
  background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);
  padding:26px;transition:border-color .2s ease, transform .2s ease;
}
.card:hover{border-color:var(--primary);transform:translateY(-3px);}
.card .icon{
  width:44px;height:44px;border-radius:11px;background:var(--surface-2);
  display:flex;align-items:center;justify-content:center;font-size:19px;margin-bottom:16px;
  font-family:"SFMono-Regular",Consolas,"Liberation Mono",Menlo,monospace;font-weight:800;
}
.card h3{font-size:17px;font-weight:700;margin-bottom:8px;}
.card p{color:var(--text-muted);font-size:14.5px;}
.card .card-foot{margin-top:16px;display:flex;align-items:center;gap:8px;font-size:13.5px;font-weight:700;color:var(--primary-2);}

/* Track card (HTML/CSS/JS en Aprende) */
.track-card{
  background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);
  padding:28px;display:flex;flex-direction:column;transition:border-color .2s ease, transform .2s ease;
}
.track-card:hover{border-color:var(--primary);transform:translateY(-3px);}
.track-card .icon{
  width:48px;height:48px;border-radius:12px;
  display:flex;align-items:center;justify-content:center;font-size:18px;font-weight:900;
  font-family:"SFMono-Regular",Consolas,"Liberation Mono",Menlo,monospace;margin-bottom:18px;color:#0a0d16;
}
.track-card.t-html .icon{background:linear-gradient(135deg,#f0a56f 0%,#f0d76f 100%);}
.track-card.t-css .icon{background:linear-gradient(135deg,#6fa5f0 0%,#6f6bf0 100%);}
.track-card.t-js .icon{background:linear-gradient(135deg,#f0e46f 0%,#fbbf24 100%);}
.track-card.t-glosario .icon{background:linear-gradient(135deg,#a78bfa 0%,#818cf8 100%);font-size:20px;}
.track-card.t-vscode .icon{background:linear-gradient(135deg,#60a5fa 0%,#3b82f6 100%);font-size:20px;}
.track-card.t-extensiones .icon{background:linear-gradient(135deg,#34d399 0%,#10b981 100%);font-size:20px;}
.track-card h3{font-size:18px;font-weight:800;margin-bottom:8px;}
.track-card p{color:var(--text-muted);font-size:14.5px;flex:1;}
.track-card .track-meta{display:flex;gap:10px;margin-top:18px;font-size:12.5px;color:var(--text-faint);}

/* Subsection label (eyebrow entre bloques de una misma página) */
.subsection-label{display:block;font-size:13.5px;font-weight:800;text-transform:uppercase;letter-spacing:.05em;color:var(--text-faint);margin-bottom:16px;}

/* Lesson roadmap list */
.lesson-list{display:flex;flex-direction:column;gap:12px;}
.lesson-item{
  display:flex;align-items:center;gap:16px;
  background:var(--surface);border:1px solid var(--border);border-radius:12px;
  padding:16px 20px;
}
.lesson-item .num{
  width:34px;height:34px;border-radius:9px;background:var(--surface-2);border:1px solid var(--border);
  display:flex;align-items:center;justify-content:center;font-weight:800;font-size:14px;flex:none;color:var(--text-muted);
}
.lesson-item.done .num{background:var(--primary-grad);color:#0a0d16;border-color:transparent;}
.lesson-item .info{flex:1;min-width:0;}
.lesson-item .info strong{display:block;font-size:15px;font-weight:700;}
.lesson-item .info span{display:block;font-size:13px;color:var(--text-muted);margin-top:2px;}
.lesson-item .status{flex:none;font-size:12.5px;font-weight:700;padding:5px 12px;border-radius:999px;}
.lesson-item.done .status{background:rgba(52,211,153,.15);color:var(--success);}
.lesson-item.soon .status{background:var(--surface-2);color:var(--text-faint);border:1px solid var(--border);}
.lesson-item.soon{opacity:.7;}

/* Code block */
.codeblock{
  border-radius:var(--radius);overflow:hidden;
  background:var(--surface);border:1px solid var(--border);box-shadow:var(--shadow);
  margin:20px 0;
}
.codeblock-head{
  display:flex;align-items:center;gap:8px;
  padding:11px 14px;background:var(--surface-2);border-bottom:1px solid var(--border);
}
.codeblock-head .tdot{width:10px;height:10px;border-radius:50%;display:inline-block;background:var(--border);}
.codeblock-head .label{margin-left:auto;font-size:11.5px;color:var(--text-faint);font-weight:600;letter-spacing:.02em;font-family:"SFMono-Regular",Consolas,"Liberation Mono",Menlo,monospace;}
.codeblock-head .copy-btn{
  flex:none;margin-left:10px;padding:4px 10px;border-radius:6px;
  background:var(--surface);border:1px solid var(--border);color:var(--text-muted);
  font-size:11px;font-weight:700;letter-spacing:.02em;
  transition:border-color .15s ease,color .15s ease,background .15s ease;
}
.codeblock-head .copy-btn:hover{border-color:var(--primary);color:var(--primary-2);}
.codeblock-head .copy-btn.copied{background:rgba(52,211,153,.15);border-color:var(--success);color:var(--success);}
.codeblock-head .copy-btn.copy-error{background:rgba(248,113,113,.15);border-color:var(--danger);color:var(--danger);}
.codeblock pre{margin:0;padding:18px 20px;overflow-x:auto;}
.codeblock code{
  font-family:"SFMono-Regular",Consolas,"Liberation Mono",Menlo,monospace;
  font-size:13.5px;line-height:1.65;color:var(--text);white-space:pre;
}
.lesson-note{
  display:flex;gap:12px;background:var(--surface-2);border:1px solid var(--border);
  border-radius:12px;padding:16px 18px;margin:20px 0;font-size:14px;color:var(--text-muted);
}
.lesson-note .ico{flex:none;font-size:18px;}
.lesson-note strong{color:var(--text);}
.prose{font-size:15.5px;color:var(--text-muted);}
.prose p{margin:0 0 16px;}
.prose p:last-child{margin-bottom:0;}
.prose strong{color:var(--text);}
.lesson-body h2{font-size:22px;font-weight:800;margin:40px 0 14px;letter-spacing:-.01em;}
.lesson-body h2:first-child{margin-top:0;}
.lesson-body ul{margin:0 0 16px;padding-left:20px;list-style:disc;color:var(--text-muted);font-size:15px;}
.lesson-body ul li{margin-bottom:6px;}
.breadcrumb{display:flex;align-items:center;gap:8px;font-size:13.5px;color:var(--text-faint);margin-bottom:18px;flex-wrap:wrap;}
.breadcrumb a{color:var(--text-muted);}
.breadcrumb a:hover{color:var(--primary-2);}

/* ---------- Glosario ---------- */
.glossary-search{position:relative;margin:28px 0 18px;}
.glossary-search input{
  width:100%;padding:13px 16px 13px 42px;border-radius:10px;
  background:var(--surface);border:1px solid var(--border);color:var(--text);
  font-size:15px;font-family:inherit;
}
.glossary-search input:focus{outline:none;border-color:var(--primary);}
.glossary-search input::placeholder{color:var(--text-faint);}
.glossary-search::before{
  content:"⌕";position:absolute;left:15px;top:50%;transform:translateY(-50%);
  color:var(--text-faint);font-size:17px;pointer-events:none;
}
.glossary-jump{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:8px;}
.glossary-jump a{cursor:pointer;}
.glossary-jump a:hover{border-color:var(--primary);color:var(--primary-2);}
.glossary-group{margin-top:40px;}
.glossary-group h2{font-size:19px;font-weight:800;margin-bottom:16px;letter-spacing:-.01em;}
.glossary-item h3{font-size:15.5px;font-weight:700;margin-bottom:8px;}
.glossary-item h3 .term-alt{font-weight:400;font-size:12.5px;color:var(--text-faint);}
.glossary-item p{color:var(--text-muted);font-size:14px;}
.glossary-item.hide{display:none;}
.glossary-empty{display:none;color:var(--text-muted);font-size:14.5px;padding:20px 0;}
.glossary-empty.show{display:block;}

/* Footer */
footer{border-top:1px solid var(--border);padding:44px 0 26px;background:var(--bg-alt);}
.foot-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:30px;margin-bottom:32px;}
@media (max-width:760px){ .foot-grid{grid-template-columns:1fr 1fr;} }
.foot-grid h4{font-size:13px;text-transform:uppercase;letter-spacing:.04em;color:var(--text-faint);margin-bottom:14px;}
.foot-grid ul li{margin-bottom:9px;}
.foot-grid ul li a{color:var(--text-muted);font-size:14px;}
.foot-grid ul li a:hover{color:var(--primary-2);}
.foot-bottom{
  display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:12px;
  padding-top:22px;border-top:1px solid var(--border);font-size:13px;color:var(--text-faint);
}

.backtotop-btn{
  position:fixed;bottom:24px;right:20px;z-index:180;
  width:44px;height:44px;border-radius:50%;
  background:var(--surface-2);border:1px solid var(--border);color:var(--text);
  display:flex;align-items:center;justify-content:center;font-size:18px;
  cursor:pointer;box-shadow:var(--shadow);
  opacity:0;pointer-events:none;transform:translateY(8px);
  transition:opacity .2s ease,transform .2s ease,border-color .15s ease,color .15s ease;
}
.backtotop-btn.show{opacity:1;pointer-events:auto;transform:translateY(0);}
.backtotop-btn:hover{border-color:var(--primary);color:var(--primary-2);}

.vh{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;}