/* =========================================================
   Profe Johnny — Curso de HTML, CSS y JavaScript
   Design tokens
   ========================================================= */
:root{
  --paper:#F4F6F8;
  --card:#FFFFFF;
  --ink:#1A2333;
  --ink-soft:#4B5566;
  --muted:#6B7484;
  --border:#E1E5EA;
  --border-soft:#EBEEF1;
  --sidebar-bg:#10151F;
  --sidebar-ink:#C7CEDA;
  --sidebar-ink-dim:#7D8698;
  --sidebar-active:#1B2333;

  --html:#E34F26;
  --html-soft:#FBEAE4;
  --css:#2965F1;
  --css-soft:#E8EEFE;
  --js:#B8860B;
  --js-soft:#FBF1DA;

  --ok:#1E8E5A;
  --ok-soft:#E4F5EC;
  --bad:#C6403A;
  --bad-soft:#FBEAE9;

  --radius:10px;
  --radius-sm:6px;
  --font-display:'Space Grotesk', sans-serif;
  --font-body:'Inter', sans-serif;
  --font-mono:'JetBrains Mono', monospace;
}

*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  font-family:var(--font-body);
  color:var(--ink);
  background:var(--paper);
  font-size:16px;
  line-height:1.65;
}
img{max-width:100%;}
a{color:inherit;}
h1,h2,h3,h4{
  font-family:var(--font-display);
  line-height:1.2;
  letter-spacing:-0.01em;
  margin:0 0 .5em;
}
code, pre, textarea.code-editor, .mono{font-family:var(--font-mono);}
:focus-visible{outline:3px solid var(--css);outline-offset:2px;}

/* ---------- Topbar ---------- */
.topbar{
  position:sticky;top:0;z-index:50;
  display:flex;align-items:center;gap:1.5rem;
  padding:.85rem 1.5rem;
  background:var(--sidebar-bg);
  color:var(--sidebar-ink);
  border-bottom:1px solid #000;
}
.topbar .brand{
  font-family:var(--font-display);
  font-weight:700;font-size:1.05rem;
  color:#fff;text-decoration:none;
  display:flex;align-items:center;gap:.5rem;
  white-space:nowrap;
}
.topbar .brand .dot{width:9px;height:9px;border-radius:50%;background:var(--html);
  box-shadow:14px 0 0 var(--css), 28px 0 0 var(--js);margin-right:22px;}
.topbar nav{display:flex;gap:.25rem;flex-wrap:wrap;}
.topbar nav a{
  padding:.5rem .85rem;border-radius:999px;
  font-size:.88rem;font-weight:600;text-decoration:none;
  color:var(--sidebar-ink-dim);
}
.topbar nav a:hover{color:#fff;}
.topbar nav a.active{background:var(--sidebar-active);color:#fff;}
.topbar-spacer{flex:1;}
.progress-pill{
  font-size:.75rem;color:var(--sidebar-ink-dim);
  border:1px solid #2A3140;padding:.3rem .65rem;border-radius:999px;
}

/* ---------- Layout with sidebar ---------- */
.layout{display:flex;align-items:flex-start;min-height:calc(100vh - 56px);}
.sidebar{
  width:280px;flex:none;
  background:var(--sidebar-bg);color:var(--sidebar-ink);
  min-height:calc(100vh - 56px);
  position:sticky;top:56px;
  padding:1.25rem 0 3rem;
  overflow-y:auto;
}
.sidebar-title{
  font-size:.72rem;text-transform:uppercase;letter-spacing:.08em;
  color:var(--sidebar-ink-dim);padding:.4rem 1.25rem;margin-top:.5rem;
}
.sidebar details{border-bottom:1px solid #1D2432;}
.sidebar summary{
  cursor:pointer;list-style:none;padding:.65rem 1.25rem;
  font-weight:600;font-size:.9rem;display:flex;align-items:center;gap:.5rem;justify-content:space-between;
}
.sidebar summary i, .sidebar li a i{font-size:1rem;}
.sidebar li a{display:flex;align-items:center;gap:.4rem;}
.sidebar summary::-webkit-details-marker{display:none;}
.sidebar summary::after{content:'▸';font-size:.7rem;color:var(--sidebar-ink-dim);transition:transform .15s;}
.sidebar details[open] summary::after{transform:rotate(90deg);}
.sidebar ul{list-style:none;margin:0;padding:0 0 .5rem;}
.sidebar li a{
  display:block;padding:.42rem 1.25rem .42rem 2.1rem;
  font-size:.85rem;text-decoration:none;color:var(--sidebar-ink-dim);
  border-left:2px solid transparent;
}
.sidebar li a:hover{color:#fff;}
.sidebar li a.current{color:#fff;border-left-color:var(--accent,var(--css));background:var(--sidebar-active);font-weight:600;}

/* ---------- Main content ---------- */
main.content{
  flex:1;min-width:0;
  padding:2.25rem 3rem 5rem;
  width:100%;
}
.breadcrumb{font-size:.8rem;color:var(--muted);margin-bottom:1rem;}
.breadcrumb a{text-decoration:none;color:var(--muted);}
.breadcrumb a:hover{color:var(--ink);}
.eyebrow{
  display:inline-block;font-size:.72rem;font-weight:700;letter-spacing:.08em;
  text-transform:uppercase;color:var(--accent,var(--css));margin-bottom:.6rem;
}
.lead{color:var(--ink-soft);font-size:1.05rem;}
p{color:var(--ink-soft);}
.content h2{margin-top:2.4rem;font-size:1.4rem;}
.content h3{margin-top:1.8rem;font-size:1.1rem;}
.content ul, .content ol{color:var(--ink-soft);padding-left:1.3rem;}
.content li{margin-bottom:.35rem;}

/* ---------- Cards / home ---------- */
.hero{padding:3.5rem 3rem 1rem;width:100%;text-align:center;}
.hero h1{font-size:2.3rem;max-width:20ch;margin-left:auto;margin-right:auto;}
.hero .lead{margin-left:auto;margin-right:auto;}
.card-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1.1rem;padding:1.5rem 3rem 3rem;width:100%;}
@media(max-width:820px){.card-grid{grid-template-columns:1fr;}}
.mod-card{
  background:var(--card);border:1px solid var(--border);border-radius:var(--radius);
  padding:1.4rem 1.4rem 1.5rem;text-decoration:none;color:var(--ink);
  border-top:4px solid var(--accent);
  transition:transform .12s ease, box-shadow .12s ease;
}
.mod-card:hover{transform:translateY(-3px);box-shadow:0 10px 24px -12px rgba(20,25,40,.25);}
.mod-card .card-icon{display:block;font-size:1.8rem;color:var(--accent);margin-bottom:.6rem;}
.mod-card .tag{font-family:var(--font-mono);font-size:.72rem;color:var(--accent);font-weight:700;}
.mod-card h3{margin:.35rem 0 .4rem;font-size:1.25rem;display:flex;align-items:center;gap:.4rem;}
.mod-card p{font-size:.88rem;margin:0 0 .8rem;}
.mod-card .meta{font-size:.78rem;color:var(--muted);display:flex;gap:.9rem;}

.stat-row{display:flex;gap:2rem;padding:0 3rem 2rem;flex-wrap:wrap;width:100%;justify-content:center;}
.stat{text-align:center;}
.stat .n{font-family:var(--font-display);font-size:1.8rem;font-weight:700;}
.stat .l{font-size:.78rem;color:var(--muted);}

/* ---------- Module landing ---------- */
.section-cards{display:grid;grid-template-columns:1fr 1fr;gap:1.1rem;margin-top:1.5rem;}
@media(max-width:720px){.section-cards{grid-template-columns:1fr;}}
.section-card{
  border:1px solid var(--border);background:var(--card);border-radius:var(--radius);
  padding:1.3rem;text-decoration:none;color:var(--ink);
}
.section-card h3{font-size:1.05rem;margin-bottom:.3rem;color:var(--accent);display:flex;align-items:center;gap:.45rem;}
.section-card p{font-size:.87rem;margin:0;}
.topic-list{margin-top:1rem;border:1px solid var(--border-soft);border-radius:var(--radius);overflow:hidden;background:var(--card);}
.topic-list a{
  display:flex;gap:.7rem;align-items:baseline;
  padding:.75rem 1.1rem;text-decoration:none;color:var(--ink);
  border-bottom:1px solid var(--border-soft);font-size:.92rem;
}
.topic-list a:last-child{border-bottom:none;}
.topic-list a:hover{background:var(--paper);}
.topic-list .num{font-family:var(--font-mono);color:var(--accent);font-size:.8rem;font-weight:700;}

/* ---------- Code editor widget ---------- */
.editor{
  margin:1.2rem 0 1.5rem;border-radius:var(--radius);overflow:hidden;
  border:1px solid #232B3B;background:#141B29;
}
.editor-bar{
  display:flex;align-items:center;gap:.5rem;padding:.55rem .8rem;
  background:#0F1520;
}
.editor-bar .dots{display:flex;gap:5px;margin-right:.4rem;}
.editor-bar .dots span{width:9px;height:9px;border-radius:50%;display:block;}
.editor-bar .dots span:nth-child(1){background:#E5605A;}
.editor-bar .dots span:nth-child(2){background:#E7B93F;}
.editor-bar .dots span:nth-child(3){background:#3EBA6B;}
.editor-bar .label{font-family:var(--font-mono);font-size:.72rem;color:#8892A6;margin-right:auto;}
.editor-btn{
  font-family:var(--font-body);font-size:.75rem;font-weight:600;
  border:1px solid #2B3448;background:#1B2333;color:#DCE1EA;
  padding:.32rem .7rem;border-radius:999px;cursor:pointer;
}
.editor-btn.primary{background:var(--accent,var(--css));border-color:transparent;color:#0B0F17;}
.editor-btn:hover{filter:brightness(1.15);}
.editor-body{display:grid;grid-template-columns:1fr 1fr;min-height:190px;}
.editor-body.single{grid-template-columns:1fr;}
@media(max-width:680px){.editor-body{grid-template-columns:1fr;}}
textarea.code-editor{
  width:100%;height:100%;min-height:190px;resize:vertical;
  background:#141B29;color:#E6E9F0;border:none;
  padding:.9rem 1rem;font-size:.83rem;line-height:1.55;
  border-right:1px solid #232B3B;
}
@media(max-width:680px){textarea.code-editor{border-right:none;border-bottom:1px solid #232B3B;}}
.editor-output{background:#0C1119;}
.editor-output iframe{width:100%;height:100%;min-height:190px;border:0;background:#fff;}
.editor-console{
  color:#B7E4C7;font-family:var(--font-mono);font-size:.82rem;
  padding:.9rem 1rem;white-space:pre-wrap;min-height:190px;
}
.editor-console .err{color:#F29B95;}
.editor-console .empty{color:#5D6578;}

.callout{
  border-left:3px solid var(--accent,var(--css));background:var(--card);
  border-radius:0 var(--radius-sm) var(--radius-sm) 0;
  padding:.9rem 1.1rem;margin:1.2rem 0;font-size:.92rem;color:var(--ink-soft);
}
.callout strong{color:var(--ink);}

/* ---------- Exercises ---------- */
.exercise{
  border:1px solid var(--border);background:var(--card);border-radius:var(--radius);
  padding:1.1rem 1.2rem 1.3rem;margin:1.1rem 0;
}
.exercise .ex-head{display:flex;align-items:center;gap:.6rem;margin-bottom:.4rem;}
.exercise .ex-num{
  font-family:var(--font-mono);font-weight:700;font-size:.8rem;color:#fff;
  background:var(--accent,var(--css));width:26px;height:26px;border-radius:50%;
  display:flex;align-items:center;justify-content:center;flex:none;
}
.exercise .ex-title{font-weight:700;font-size:.98rem;}
.exercise p{margin:.3rem 0 0;font-size:.92rem;}
.exercise .badge{font-size:.68rem;font-weight:700;text-transform:uppercase;letter-spacing:.04em;
  padding:.15rem .5rem;border-radius:999px;margin-left:auto;}
.badge.basico{background:var(--ok-soft);color:var(--ok);}
.badge.intermedio{background:var(--js-soft);color:#8A6200;}
.badge.avanzado{background:var(--bad-soft);color:var(--bad);}
details.solution{margin-top:.8rem;}
details.solution summary{
  cursor:pointer;font-size:.82rem;font-weight:600;color:var(--accent,var(--css));
  list-style:none;
}
details.solution summary::-webkit-details-marker{display:none;}
details.solution summary::before{content:'▸ ';}
details.solution[open] summary::before{content:'✓ ';}
details.solution .sol-body{margin-top:.6rem;}

/* ---------- Quiz ---------- */
.quiz-q{
  border:1px solid var(--border);background:var(--card);border-radius:var(--radius);
  padding:1.1rem 1.2rem;margin-bottom:1rem;
}
.quiz-q .q-title{font-weight:700;font-size:.95rem;margin-bottom:.7rem;}
.quiz-q .q-num{color:var(--accent);font-family:var(--font-mono);margin-right:.4rem;}
.quiz-opt{
  display:flex;align-items:center;gap:.6rem;
  padding:.55rem .7rem;border:1px solid var(--border);border-radius:var(--radius-sm);
  margin-bottom:.5rem;cursor:pointer;font-size:.88rem;background:var(--paper);
}
.quiz-opt:hover{border-color:var(--accent);}
.quiz-opt input{accent-color:var(--accent);}
.quiz-opt.correct{background:var(--ok-soft);border-color:var(--ok);}
.quiz-opt.incorrect{background:var(--bad-soft);border-color:var(--bad);}
.quiz-actions{display:flex;align-items:center;gap:1rem;margin:1.5rem 0 3rem;}
.btn{
  font-family:var(--font-body);font-weight:700;font-size:.9rem;
  background:var(--accent,var(--css));color:#fff;border:none;
  padding:.7rem 1.4rem;border-radius:999px;cursor:pointer;
}
.btn:hover{filter:brightness(1.08);}
.quiz-result{
  font-family:var(--font-display);font-size:1.4rem;font-weight:700;display:none;
}
#quiz-form.graded .quiz-opt{pointer-events:none;}

/* ---------- Prev/Next ---------- */
.pagenav{
  display:flex;justify-content:space-between;gap:1rem;
  margin-top:3rem;padding-top:1.5rem;border-top:1px solid var(--border);
}
.pagenav a{
  text-decoration:none;color:var(--ink);border:1px solid var(--border);
  background:var(--card);padding:.7rem 1rem;border-radius:var(--radius-sm);
  font-size:.85rem;max-width:46%;
}
.pagenav a .dir{display:block;font-size:.68rem;color:var(--muted);text-transform:uppercase;letter-spacing:.05em;margin-bottom:.15rem;}
.pagenav a:hover{border-color:var(--accent);}
.pagenav .next{margin-left:auto;text-align:right;}

/* ---------- Footer ---------- */
footer.site-footer{
  text-align:center;color:var(--muted);font-size:.8rem;padding:2rem;border-top:1px solid var(--border);
}

/* ---------- Utility accent classes ---------- */
.accent-html{--accent:var(--html);}
.accent-css{--accent:var(--css);}
.accent-js{--accent:var(--js);}

@media (max-width:900px){
  .sidebar{display:none;}
  main.content{padding:1.6rem 1.2rem 4rem;}
  .hero,.card-grid,.stat-row{padding-left:1.2rem;padding-right:1.2rem;}
}