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

:root{
  --navy:#0f2454;
  --navy-2:#173a7a;
  --navy-dark:#081733;
  --ice:#cfe0ff;
  --bg:#f8fafc;
  --surface:#ffffff;
  --surface-2:#eff1f9;
  --border:#e3e7f0;
  --text:#1b2333;
  --text-mut:#5c6478;
  --text-inv:#ffffff;
  --green:#1a9e6a;
  --green-bg:#e7f7ef;
  --red:#d64545;
  --red-bg:#fdeaea;
  --gold:#c98a12;
  --gold-bg:#fbf1de;
  --info:#2861c9;
  --info-bg:#e9f0ff;
  --s-sm:0 1px 3px rgba(0,0,0,.05);
  --s-md:0 4px 14px rgba(0,0,0,.07);
  --s-lg:0 10px 30px rgba(0,0,0,.09);
  --r-card:14px;
  --r-sm:8px;
  --r-hero:20px;
  --sidebar-w:268px;
}

*{box-sizing:border-box;}
html,body{margin:0;padding:0;}
body{
  font-family:'DM Sans',sans-serif;
  background:var(--bg);
  color:var(--text);
  line-height:1.55;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{font-family:'Syne',sans-serif;margin:0;}
p{margin:0 0 12px;}
button{font-family:inherit;cursor:pointer;}
.mono{font-family:'JetBrains Mono',monospace;}

/* ============ SIDEBAR ============ */
#sidebar{
  position:fixed;top:0;left:0;bottom:0;width:var(--sidebar-w);
  background:var(--navy-dark);color:#fff;
  display:flex;flex-direction:column;
  z-index:100;transition:transform .3s ease;
}
.sb-head{padding:24px 20px 18px;display:flex;align-items:center;gap:12px;border-bottom:1px solid rgba(255,255,255,.08);}
.sb-logo{
  width:44px;height:44px;border-radius:12px;flex:none;
  background:linear-gradient(135deg,var(--navy-2),var(--ice));
  display:flex;align-items:center;justify-content:center;
  font-family:'Syne',sans-serif;font-weight:800;font-size:17px;color:var(--navy-dark);
}
.sb-title{font-family:'Syne',sans-serif;font-weight:700;font-size:14.5px;line-height:1.25;}
.sb-sub{font-size:11px;color:rgba(255,255,255,.5);margin-top:2px;font-family:'JetBrains Mono',monospace;}
#sidebar nav{flex:1;overflow-y:auto;padding:14px 10px;}
.sb-section-label{
  font-size:10.5px;letter-spacing:.08em;text-transform:uppercase;color:rgba(255,255,255,.38);
  padding:14px 12px 6px;font-family:'JetBrains Mono',monospace;
}
.sb-item{
  display:flex;align-items:center;gap:10px;padding:9px 12px;border-radius:10px;
  color:rgba(255,255,255,.72);text-decoration:none;cursor:pointer;font-size:13.5px;margin-bottom:2px;
  transition:background .15s,color .15s;
}
.sb-item:hover{background:rgba(255,255,255,.06);color:#fff;}
.sb-item.active{background:linear-gradient(135deg,var(--navy-2),#2451a6);color:#fff;font-weight:600;}
.sb-item.done .sb-num{color:#7fd8ac;}
.sb-num{font-family:'JetBrains Mono',monospace;font-size:10.5px;color:rgba(255,255,255,.4);width:20px;flex:none;}
.sb-ico{flex:none;width:18px;text-align:center;}
.sb-item.done::after{content:'✓';margin-left:auto;color:#7fd8ac;font-size:11px;}
.sb-foot{padding:16px 20px 20px;border-top:1px solid rgba(255,255,255,.08);}
.sb-prog-label{display:flex;justify-content:space-between;font-size:11px;color:rgba(255,255,255,.55);margin-bottom:6px;font-family:'JetBrains Mono',monospace;}
.sb-prog-track{height:6px;border-radius:4px;background:rgba(255,255,255,.12);overflow:hidden;}
.sb-prog-fill{height:100%;background:linear-gradient(90deg,var(--navy-2),#5b9bff);border-radius:4px;transition:width .4s ease;}

#hamburger{
  display:none;position:fixed;top:14px;left:14px;z-index:120;
  width:42px;height:42px;border-radius:10px;border:none;background:var(--navy-dark);color:#fff;
  font-size:18px;box-shadow:var(--s-md);
}
#overlay{display:none;position:fixed;inset:0;background:rgba(8,15,30,.5);z-index:99;}

/* ============ MAIN ============ */
#main{margin-left:var(--sidebar-w);min-height:100vh;position:relative;}
#topbar{position:fixed;top:0;left:var(--sidebar-w);right:0;height:3px;background:rgba(0,0,0,.04);z-index:90;}
#topbar-fill{height:100%;width:0%;background:linear-gradient(90deg,var(--navy),#5b9bff);transition:width .4s ease;}

.page{display:none;flex-direction:column;min-height:100vh;}
.page.active{display:flex;animation:pageIn .38s ease;}
@keyframes pageIn{from{opacity:0;transform:translateY(12px);}to{opacity:1;transform:translateY(0);}}

/* Hero band shared by ALL pages including inicio */
.hero{
  background:linear-gradient(135deg,var(--navy-dark) 0%,var(--navy) 55%,var(--navy-2) 100%);
  color:#fff;padding:40px 48px 46px;position:relative;overflow:hidden;
}
.hero::after{
  content:'';position:absolute;right:-80px;top:-80px;width:320px;height:320px;border-radius:50%;
  background:radial-gradient(circle,rgba(255,255,255,.07),transparent 70%);
}
.breadcrumb{font-family:'JetBrains Mono',monospace;font-size:12px;color:rgba(255,255,255,.55);margin-bottom:14px;}
.hero-badge{
  display:inline-flex;align-items:center;justify-content:center;
  width:40px;height:40px;border-radius:10px;margin-bottom:14px;
  background:linear-gradient(135deg,var(--ice),#5b9bff);color:var(--navy-dark);
  font-family:'JetBrains Mono',monospace;font-weight:700;font-size:13px;
}
.hero h1{
  font-size:32px;font-weight:800;line-height:1.15;
  background:linear-gradient(90deg,#fff,var(--ice));
  -webkit-background-clip:text;background-clip:text;color:transparent;
  margin-bottom:10px;max-width:760px;
}
.hero-sub{color:rgba(255,255,255,.62);font-size:15px;max-width:680px;margin-bottom:16px;}
.chips{display:flex;gap:8px;flex-wrap:wrap;}
.chip{
  padding:5px 12px;border-radius:20px;background:rgba(255,255,255,.1);
  font-size:12px;color:rgba(255,255,255,.85);border:1px solid rgba(255,255,255,.14);
}

/* Body */
.page-body{padding:44px 48px;max-width:960px;flex:1;width:100%;}
.sec-title{
  display:flex;align-items:center;gap:10px;font-size:20px;font-weight:700;margin:28px 0 16px;
}
.sec-title::before{content:'';width:4px;height:20px;border-radius:3px;background:var(--navy);}
.sec-title:first-child{margin-top:0;}
.divider{height:1px;background:var(--border);margin:30px 0;}
.lead{font-size:15.5px;color:var(--text);}

/* Tabs */
.tab-bar{display:flex;gap:6px;background:var(--surface-2);border-radius:12px;padding:5px;margin-bottom:24px;flex-wrap:wrap;}
.tab-btn{
  flex:1;min-width:120px;border:none;background:transparent;padding:10px 14px;border-radius:9px;
  font-size:13.5px;font-weight:600;color:var(--text-mut);transition:all .15s;
}
.tab-btn.active{background:var(--navy);color:#fff;box-shadow:var(--s-sm);}
.tab-panel{display:none;}
.tab-panel.active{display:block;animation:fadeIn .3s ease;}
@keyframes fadeIn{from{opacity:0;}to{opacity:1;}}

/* Cards grid */
.cards-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:16px;margin:18px 0;}
.card{
  background:var(--surface);border:1px solid var(--border);border-radius:var(--r-card);
  padding:20px;position:relative;overflow:hidden;box-shadow:var(--s-sm);
  transition:transform .18s,box-shadow .18s;
}
.card::before{content:'';position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,var(--navy),#5b9bff);}
.card:hover{transform:translateY(-3px);box-shadow:var(--s-lg);}
.card-ico{font-size:24px;margin-bottom:10px;}
.card h4{font-size:15px;margin-bottom:6px;}
.card p{font-size:13.5px;color:var(--text-mut);margin-bottom:0;}
.card .tag{display:inline-block;margin-top:10px;font-size:11px;font-family:'JetBrains Mono',monospace;color:var(--navy);background:var(--surface-2);padding:3px 9px;border-radius:6px;}

/* Topic map cards (home) */
.topicmap-card{cursor:pointer;}

/* Stat cards */
.stat-row{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:14px;margin:26px 0;}
.stat-card{
  background:var(--surface);border:1px solid var(--border);border-radius:var(--r-card);
  padding:18px 16px;text-align:center;box-shadow:var(--s-sm);
}
.stat-num{font-family:'Syne',sans-serif;font-size:30px;font-weight:800;color:var(--navy);}
.stat-lbl{font-size:12px;color:var(--text-mut);margin-top:4px;}

/* Technique blocks */
.technique-block{border:1px solid var(--border);border-radius:var(--r-card);padding:22px;margin-bottom:18px;background:var(--surface);box-shadow:var(--s-sm);}
.tb-head{display:flex;gap:14px;align-items:flex-start;margin-bottom:12px;}
.tb-ico{
  width:48px;height:48px;border-radius:12px;flex:none;display:flex;align-items:center;justify-content:center;
  font-size:22px;background:linear-gradient(135deg,var(--navy),var(--navy-2));color:#fff;
}
.tb-head h4{font-size:16px;margin-bottom:3px;}
.tb-head .tb-type{font-size:12px;color:var(--text-mut);font-family:'JetBrains Mono',monospace;}
.tb-desc{font-size:14px;color:var(--text);margin-bottom:12px;}

/* Callouts */
.box{border-left:3.5px solid;border-radius:10px;padding:14px 16px;margin:14px 0;font-size:14px;display:flex;gap:10px;}
.box .box-icon{flex:none;font-size:17px;line-height:1.4;}
.info-box{border-color:var(--info);background:var(--info-bg);}
.warn-box{border-color:var(--gold);background:var(--gold-bg);}
.success-box{border-color:var(--green);background:var(--green-bg);}
.danger-box{border-color:var(--red);background:var(--red-bg);}
.navy-box{border-color:var(--navy);background:#eef1fb;}

/* Accordion */
.acc{border:1px solid var(--border);border-radius:12px;margin-bottom:10px;overflow:hidden;background:var(--surface);}
.acc-head{display:flex;justify-content:space-between;align-items:center;padding:14px 18px;cursor:pointer;font-weight:600;font-size:14px;}
.acc-head:hover{background:var(--surface-2);}
.acc-head .chev{transition:transform .25s;color:var(--navy);}
.acc.open .acc-head{background:#eff1f9;}
.acc.open .chev{transform:rotate(180deg);}
.acc-body{max-height:0;overflow:hidden;transition:max-height .3s ease;}
.acc-body-in{padding:2px 18px 16px;font-size:13.5px;color:var(--text-mut);}

/* Exercise (Casos) */
.exercise{border:1px solid var(--border);border-radius:12px;margin-bottom:14px;overflow:hidden;background:var(--surface);}
.ex-head{display:flex;justify-content:space-between;align-items:center;padding:15px 18px;cursor:pointer;}
.ex-head .ex-title{font-weight:700;font-size:14.5px;}
.ex-badge{font-size:11px;font-family:'JetBrains Mono',monospace;background:var(--surface-2);color:var(--navy);padding:3px 10px;border-radius:6px;margin-left:8px;}
.ex-body{max-height:0;overflow:hidden;transition:max-height .35s ease;}
.ex-body-in{padding:4px 18px 18px;}
.ex-context{border-left:3px solid var(--navy);background:var(--surface-2);padding:12px 14px;border-radius:0 8px 8px 0;font-size:13.5px;margin-bottom:12px;}
.ex-questions{font-size:13.5px;margin-bottom:12px;}
.btn-sol{border:1px solid var(--navy);background:#fff;color:var(--navy);padding:8px 16px;border-radius:8px;font-size:13px;font-weight:600;}
.btn-sol:hover{background:var(--navy);color:#fff;}
.sol-body{max-height:0;overflow:hidden;transition:max-height .3s ease;margin-top:10px;}
.sol-body-in{background:var(--green-bg);border-left:3px solid var(--green);padding:12px 14px;border-radius:0 8px 8px 0;font-size:13.5px;}

/* FAQ */
.faq-item{border-bottom:1px solid var(--border);padding:14px 0;}
.faq-q{display:flex;justify-content:space-between;align-items:center;cursor:pointer;font-weight:700;font-size:14px;}
.faq-q .chev{color:var(--navy);transition:transform .25s;}
.faq-item.open .chev{transform:rotate(180deg);}
.faq-a{max-height:0;overflow:hidden;transition:max-height .3s ease;}
.faq-a-in{padding-top:10px;font-size:13.5px;color:var(--text-mut);}

/* Tables */
.tbl-wrap{overflow-x:auto;margin:16px 0;}
table.styled{width:100%;border-collapse:collapse;font-size:13.5px;background:var(--surface);border-radius:10px;overflow:hidden;box-shadow:var(--s-sm);}
table.styled th{background:var(--navy);color:#fff;text-align:left;padding:11px 14px;font-weight:600;}
table.styled td{padding:10px 14px;border-bottom:1px solid var(--border);}
table.styled tr:nth-child(even) td{background:var(--surface-2);}
table.styled tr:hover td{background:#e7ecfb;}
table.styled td:first-child{font-weight:700;}

/* Flow */
.flow-wrap{display:flex;align-items:center;gap:6px;flex-wrap:wrap;margin:18px 0;}
.flow-step{display:flex;flex-direction:column;align-items:center;gap:8px;text-align:center;width:120px;}
.flow-circle{
  width:44px;height:44px;border-radius:50%;background:linear-gradient(135deg,var(--navy),var(--navy-2));
  color:#fff;display:flex;align-items:center;justify-content:center;font-family:'JetBrains Mono',monospace;font-weight:700;
}
.flow-step span{font-size:12px;color:var(--text-mut);}
.flow-arrow{color:var(--navy);font-size:18px;flex:none;}

/* Simulator */
.simulator{border-radius:var(--r-card);overflow:hidden;margin:22px 0;box-shadow:var(--s-md);border:1px solid var(--border);}
.sim-header{background:linear-gradient(135deg,var(--navy-dark),var(--navy));color:#fff;padding:18px 22px;display:flex;align-items:center;gap:14px;}
.sim-ico{font-size:26px;}
.sim-header h4{font-size:16px;}
.sim-header .sim-sub{font-size:12.5px;color:rgba(255,255,255,.65);}
.sim-body{background:var(--surface);padding:24px;}
.btn-reset{background:var(--surface-2);border:1px solid var(--border);padding:8px 16px;border-radius:8px;font-size:13px;font-weight:600;color:var(--text);margin-top:14px;}
.btn-reset:hover{background:#e2e6f2;}
.btn-primary{background:var(--navy);color:#fff;border:none;padding:9px 18px;border-radius:8px;font-size:13.5px;font-weight:600;}
.btn-primary:hover{background:var(--navy-2);}

.dnd-zone-row{display:grid;grid-template-columns:1fr;gap:16px;}
.dnd-bank{display:flex;flex-wrap:wrap;gap:8px;padding:14px;background:var(--surface-2);border-radius:10px;min-height:52px;}
.dnd-item{
  padding:8px 14px;background:#fff;border:1px solid var(--border);border-radius:8px;font-size:13px;font-weight:600;
  cursor:grab;box-shadow:var(--s-sm);
}
.dnd-item:active{cursor:grabbing;}
.dnd-targets{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:14px;margin-top:16px;}
.dnd-target{
  border:2px dashed var(--border);border-radius:10px;padding:14px;min-height:110px;background:var(--bg);
}
.dnd-target h5{font-size:13px;margin-bottom:8px;color:var(--navy);}
.dnd-target.over{border-color:var(--navy);background:#eef1fb;}
.dnd-target .dnd-item.correct{border-color:var(--green);background:var(--green-bg);}
.dnd-target .dnd-item.incorrect{border-color:var(--red);background:var(--red-bg);}
.dnd-score{margin-top:14px;font-size:13px;font-weight:600;color:var(--navy);}

.matrix-modes{display:flex;gap:8px;margin-bottom:14px;flex-wrap:wrap;}
.mode-btn{border:1px solid var(--border);background:#fff;padding:7px 14px;border-radius:8px;font-size:12.5px;font-weight:600;}
.mode-btn.active{background:var(--navy);color:#fff;border-color:var(--navy);}
.stacey-grid{display:grid;grid-template-columns:60px repeat(5,1fr);gap:4px;margin:14px 0;}
.stacey-cell{
  aspect-ratio:1;border-radius:8px;background:var(--surface-2);display:flex;align-items:center;justify-content:center;
  font-size:11px;cursor:pointer;font-family:'JetBrains Mono',monospace;color:var(--text-mut);border:1px solid var(--border);
}
.stacey-cell.picked{background:var(--navy);color:#fff;}
.stacey-cell.axis{background:transparent;border:none;font-weight:700;color:var(--navy);font-size:10px;}
.stacey-feedback{margin-top:12px;font-size:13.5px;}

.cf-steps{display:flex;gap:6px;margin-bottom:18px;}
.cf-step-dot{width:26px;height:26px;border-radius:50%;background:var(--surface-2);display:flex;align-items:center;justify-content:center;font-size:11px;font-weight:700;color:var(--text-mut);}
.cf-step-dot.active{background:var(--navy);color:#fff;}
.cf-step-dot.done{background:var(--green);color:#fff;}
.cf-scenario{background:var(--surface-2);border-radius:10px;padding:16px;margin-bottom:14px;font-size:14px;}
.cf-options{display:flex;flex-direction:column;gap:8px;}
.cf-opt{border:1px solid var(--border);background:#fff;padding:12px 14px;border-radius:9px;text-align:left;font-size:13.5px;}
.cf-opt:hover{border-color:var(--navy);}
.cf-opt.ok{border-color:var(--green);background:var(--green-bg);}
.cf-opt.err{border-color:var(--red);background:var(--red-bg);}
.cf-feedback{margin-top:12px;font-size:13.5px;padding:12px 14px;border-radius:9px;}
.cf-score{margin-top:14px;font-weight:700;color:var(--navy);}

.seq-bank{display:flex;flex-wrap:wrap;gap:8px;padding:14px;background:var(--surface-2);border-radius:10px;margin-bottom:14px;}
.seq-slots{display:flex;flex-direction:column;gap:8px;}
.seq-slot{border:2px dashed var(--border);border-radius:9px;min-height:46px;display:flex;align-items:center;padding:0 10px;gap:10px;background:var(--bg);}
.seq-slot .slot-num{font-family:'JetBrains Mono',monospace;color:var(--text-mut);font-size:12px;width:20px;}
.seq-slot.over{border-color:var(--navy);}
.seq-item{padding:8px 14px;background:#fff;border:1px solid var(--border);border-radius:8px;font-size:13px;font-weight:600;cursor:grab;box-shadow:var(--s-sm);}
.seq-result{margin-top:14px;font-size:13.5px;font-weight:600;}

/* Quiz */
.quiz-wrap{background:var(--surface);border-radius:var(--r-card);padding:0;overflow:hidden;box-shadow:var(--s-md);border:1px solid var(--border);}
.quiz-progress{height:6px;background:var(--surface-2);}
.quiz-progress-fill{height:100%;background:linear-gradient(90deg,var(--navy),#5b9bff);transition:width .3s ease;}
.quiz-inner{padding:28px 30px;}
.quiz-count{font-family:'JetBrains Mono',monospace;font-size:12px;color:var(--text-mut);margin-bottom:14px;}
.quiz-q{font-family:'Syne',sans-serif;font-size:18px;font-weight:700;margin-bottom:20px;}
.quiz-opts{display:flex;flex-direction:column;gap:10px;}
.quiz-opt{border:1.5px solid var(--border);background:#fff;padding:13px 16px;border-radius:10px;text-align:left;font-size:14px;transition:all .15s;}
.quiz-opt:hover{border-color:var(--navy);background:var(--surface-2);}
.quiz-opt.correct{border-color:var(--green);background:var(--green-bg);color:#116b45;font-weight:600;}
.quiz-opt.incorrect{border-color:var(--red);background:var(--red-bg);color:#a02323;font-weight:600;}
.quiz-explain{margin-top:16px;padding:14px 16px;border-radius:10px;background:var(--surface-2);font-size:13.5px;display:none;}
.quiz-explain.show{display:block;}
.quiz-next{margin-top:18px;display:none;}
.quiz-next.show{display:inline-block;}
.quiz-result{text-align:center;padding:20px 0;}
.quiz-result .big-score{font-family:'Syne',sans-serif;font-size:52px;font-weight:800;color:var(--navy);}
.quiz-result-bar{height:10px;border-radius:6px;background:var(--surface-2);margin:16px 0;overflow:hidden;}
.quiz-result-fill{height:100%;border-radius:6px;transition:width .6s ease;}
.quiz-msg{font-size:15px;font-weight:600;margin:8px 0 18px;}

/* Footer nav */
.foot-nav{
  display:flex;justify-content:space-between;align-items:center;padding:22px 48px;
  border-top:1px solid var(--border);background:var(--surface);margin-top:auto;flex-wrap:wrap;gap:10px;
}
.foot-btn{border:1px solid var(--border);background:#fff;padding:10px 20px;border-radius:9px;font-size:13.5px;font-weight:600;color:var(--text);}
.foot-btn.next{background:var(--navy);color:#fff;border-color:var(--navy);}
.foot-btn:disabled{opacity:.35;cursor:not-allowed;}
.foot-count{font-family:'JetBrains Mono',monospace;font-size:12.5px;color:var(--text-mut);}

/* Home hero start button */
.btn-start{
  display:inline-block;margin-top:10px;background:#fff;color:var(--navy-dark);font-weight:700;
  padding:12px 24px;border-radius:10px;border:none;font-size:14px;
}
.btn-start:hover{background:var(--ice);}

/* Responsive */
@media (max-width:1024px){
  #sidebar{transform:translateX(-100%);}
  #sidebar.open{transform:translateX(0);}
  #main{margin-left:0;}
  #topbar{left:0;}
  #hamburger{display:flex;align-items:center;justify-content:center;}
  #overlay.show{display:block;}
  .cards-grid{grid-template-columns:1fr;}
  .stacey-grid{grid-template-columns:44px repeat(5,1fr);}
}
@media (max-width:640px){
  .hero{padding:70px 22px 30px;}
  .page-body{padding:28px 22px;}
  .hero h1{font-size:24px;}
  .foot-nav{padding:16px 20px;}
  .quiz-inner{padding:20px 18px;}
  .tbl-wrap{overflow-x:auto;}
  .dnd-targets{grid-template-columns:1fr;}
}