*, *::before, *::after{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }
body{
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: 'Inter', sans-serif;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
p{ margin: 0; }
h1,h2,h3{
  font-family: 'Inter', sans-serif;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 0;
}
.mono{ font-family: 'JetBrains Mono', monospace; }
a{ color: inherit; text-decoration: none; }
.wrap{ max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
section{ padding: 96px 0; border-bottom: 1px solid var(--border); }
section:last-of-type{ border-bottom: none; }

:root{
  --ink:        #071120;
  --ink-mid:    #2C3847;
  --ink-dim:    #4a5568;
  --signal:     #00C896;
  --signal-dim: #00a87d;
  --signal-soft: rgba(0,200,150,0.12);
  --surface:    #F5F7F9;
  --paper:      #ffffff;
  --border:     #e2e8f0;
  --alert:     #E14F4F;
  --basic:     #2563eb;
  --intermediate: #d97706;
  --advanced:   #dc2626;
  --maxw:       1180px;
}

/* ---------- BUTTONS ---------- */
button, .btn{
  font-family: 'Inter', sans-serif;
  font-weight: 600;
  font-size: 15px;
  border: none;
  border-radius: 6px;
  padding: 13px 24px;
  cursor: pointer;
  transition: transform 0.15s ease, opacity 0.15s ease;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
button:hover, .btn:hover{ opacity: 0.88; }
button:active, .btn:active{ transform: translateY(1px); }
button:focus-visible, .btn:focus-visible, a:focus-visible{
  outline: 2px solid var(--signal);
  outline-offset: 3px;
}
.btn-primary{ background: var(--signal); color: var(--ink); }
.btn-ghost{
  background: transparent; color: var(--ink);
  border: 1px solid var(--border);
}
.btn-secondary{
  background: var(--surface); color: var(--ink);
  border: 1px solid var(--border);
}

/* ---------- NAV ---------- */
nav{
  display: flex; align-items: center;
  justify-content: space-between;
  padding: 20px 0; position: relative;
}
.brand{
  font-family: 'Inter', sans-serif; font-weight: 700;
  font-size: 19px; letter-spacing: -0.01em;
  color: var(--signal); cursor: pointer;
  transition: opacity 0.25s ease; width: fit-content;
}
.brand:hover{ opacity: 0.85; }
nav .links{ display: flex; gap: 28px; font-size: 14px; color: var(--ink-dim); }
nav .links a:hover{ color: var(--ink); }
nav .links a.active{ color: var(--signal) !important; font-weight: 600; }
.nav-right{ display: flex; align-items: center; gap: 14px; }
.nav-toggle{
  display: none; background: transparent;
  border: 1px solid var(--border); padding: 9px;
  flex-direction: column; gap: 4px;
}
.nav-toggle span{ width: 18px; height: 2px; background: var(--ink); display: block; }

/* ---------- DISCLAIMER ---------- */
.disclaimer{
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: 20px 0; text-align: center;
}
.disclaimer p{
  font-size: 12.5px; color: var(--ink-dim);
  line-height: 1.55; margin: 0 auto; max-width: 720px; text-align: center;
}

/* ---------- HERO ---------- */
.idx-hero{ padding: 64px 0 52px; border-bottom: 1px solid var(--border); }
.idx-hero h1{
  font-size: 42px; font-weight: 700; color: var(--ink);
  letter-spacing: -0.02em; line-height: 1.1; margin: 0 0 14px;
}
.idx-hero p{
  font-size: 16px; color: var(--ink-dim); line-height: 1.65;
  max-width: 560px; margin: 0 0 32px;
}
.idx-hero-stats{ display: flex; align-items: center; gap: 0; }
.hstat{
  display: flex; flex-direction: column; gap: 2px; padding-right: 24px;
}
.hstat-n{ font-size: 26px; font-weight: 700; color: var(--ink); line-height: 1; }
.hstat-l{
  font-size: 11px; color: var(--ink-dim); font-weight: 500;
  text-transform: uppercase; letter-spacing: 0.07em;
}
.hstat-sep{
  width: 1px; height: 32px; background: var(--border); margin: 0 24px 0 0;
}

/* ---------- SEARCH ---------- */
.idx-search-bar{
  background: var(--paper); border-bottom: 1px solid var(--border);
  padding: 16px 0; position: sticky; top: 0; z-index: 5;
}
.idx-search-wrap{
  display: flex; align-items: center; gap: 10px;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 8px; padding: 11px 16px; max-width: 560px;
  transition: border-color 0.15s, box-shadow 0.15s;
}
.idx-search-wrap:focus-within{
  border-color: var(--signal);
  box-shadow: 0 0 0 3px rgba(0,200,150,0.1);
}
.idx-search-wrap svg{ width: 16px; height: 16px; color: var(--ink-dim); flex-shrink: 0; }
.idx-search-wrap input{
  flex: 1; border: none; background: transparent;
  font-family: 'Inter', sans-serif; font-size: 14px;
  color: var(--ink); outline: none;
}
.idx-search-wrap input::placeholder{ color: var(--ink-dim); }
kbd{
  font-family: 'JetBrains Mono', monospace; font-size: 10px;
  color: var(--ink-dim); background: var(--paper);
  border: 1px solid var(--border); border-radius: 4px;
  padding: 2px 6px; flex-shrink: 0;
}

/* ---------- LAYOUT ---------- */
.idx-layout{ padding: 48px 0 80px; }
.idx-grid{
  display: grid; grid-template-columns: 220px 1fr;
  gap: 48px; align-items: flex-start;
}

/* ---------- SIDEBAR ---------- */
.idx-sidenav{
  position: sticky; top: 80px; background: var(--surface);
  border: 1px solid var(--border); border-radius: 12px; padding: 20px 16px;
}
.sidenav-title{
  font-size: 10px; font-weight: 700; letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--ink-dim);
  padding: 0 8px; margin-bottom: 10px;
}
.idx-sidenav nav{
  display: flex; flex-direction: column; gap: 2px; padding: 0;
}
.snav-link{
  display: flex; align-items: center; gap: 9px;
  font-size: 13px; font-weight: 500; color: var(--ink-dim);
  text-decoration: none; padding: 8px 10px; border-radius: 7px;
  border-left: 2px solid transparent; transition: all 0.15s; white-space: nowrap;
}
.snav-link:hover{ background: var(--paper); color: var(--ink); }
.snav-link.active{
  background: rgba(0,200,150,0.07);
  border-left-color: var(--signal); color: var(--ink); font-weight: 600;
}
.snav-icon{ font-size: 14px; flex-shrink: 0; display: flex; align-items: center; }
.snav-icon svg{ width: 14px; height: 14px; display: block; flex-shrink: 0; }

/* ---------- NO RESULTS ---------- */
.no-results{
  display: flex; flex-direction: column; align-items: center;
  gap: 14px; padding: 64px 24px; text-align: center;
}
.no-results svg{ width: 36px; height: 36px; color: var(--border); }
.no-results p{ font-size: 15px; color: var(--ink-dim); margin: 0; }

/* ---------- MODULES ---------- */
.idx-module{
  border: 1px solid var(--border); border-radius: 14px;
  margin-bottom: 20px; background: var(--paper);
  scroll-margin-top: 90px;
}

.module-header{
  display: grid; grid-template-columns: 52px 1fr auto;
  gap: 16px; align-items: center;
  padding: 24px 24px 20px; border-bottom: 1px solid var(--border);
  background: var(--surface); border-radius: 14px 14px 0 0;
  margin-top: -1px;
}
.module-icon-wrap{
  width: 52px; height: 52px; border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  font-size: 22px; flex-shrink: 0;
}
.module-icon-wrap svg{ width: 22px; height: 22px; display: block; }
.general-color      { background: #f8fafc; }
.fundamentos-color  { background: #eff6ff; }
.tecnico-color      { background: #f0fdf4; }
.riesgo-color       { background: #fff7ed; }
.psicologia-color   { background: #fdf4ff; }
.forex-color        { background: #eff6ff; }
.indices-color      { background: #f0fdf4; }
.sinteticos-color   { background: rgba(0,200,150,0.08); }
.crypto-color       { background: #fff7ed; }
.commodities-color  { background: #fefce8; }
.acciones-color     { background: #f0f9ff; }
.module-eyebrow{
  font-family: 'JetBrains Mono', monospace; font-size: 10px;
  font-weight: 500; color: var(--signal); letter-spacing: 0.08em;
  margin-bottom: 4px;
}
.module-header h2{
  font-family: 'Inter', sans-serif; font-size: 19px;
  font-weight: 700; color: var(--ink); margin: 0 0 5px;
  letter-spacing: -0.01em;
}
.module-header p{
  font-size: 13.5px; color: var(--ink-dim); margin: 0;
  line-height: 1.5; max-width: 460px;
}
.module-count{
  font-family: 'JetBrains Mono', monospace; font-size: 11px;
  font-weight: 500; color: var(--ink-dim); background: var(--paper);
  border: 1px solid var(--border); border-radius: 20px;
  padding: 4px 12px; white-space: nowrap; align-self: flex-start;
}
.module-articles{
  display: flex; flex-direction: column;
  border-radius: 0 0 14px 14px; overflow: hidden;
}
.art-row{
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; padding: 13px 24px; border-bottom: 1px solid var(--border);
  text-decoration: none; cursor: pointer;
}
.art-row:last-child{ border-bottom: none; }
.art-row:hover{ background: var(--surface); }
.art-row.featured-row{
  background: rgba(0,200,150,0.03);
  border-left: 3px solid var(--signal);
  padding-left: 21px;
}
.art-row.featured-row:hover{ background: rgba(0,200,150,0.07); }
.art-row.search-hidden{ display: none; }
.art-row-left{
  display: flex; align-items: center; gap: 14px; flex: 1; min-width: 0;
}
.art-num{
  font-family: 'JetBrains Mono', monospace; font-size: 11px;
  color: var(--ink-dim); min-width: 20px; flex-shrink: 0;
}
.art-title{
  font-size: 14px; font-weight: 500; color: var(--ink);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.art-row:hover .art-title{ color: var(--signal); }
.art-row-right{
  display: flex; align-items: center; gap: 10px; flex-shrink: 0;
}
.badge-level{
  font-size: 9px; font-weight: 700; letter-spacing: 0.07em;
  text-transform: uppercase; padding: 2px 7px; border-radius: 4px;
}
.badge-level.basic     { background: #dbeafe; color: var(--basic); }
.badge-level.intermediate { background: #fef3c7; color: var(--intermediate); }
.badge-level.advanced   { background: #fee2e2; color: var(--advanced); }
.art-time{
  font-family: 'JetBrains Mono', monospace; font-size: 11px;
  color: var(--ink-dim); white-space: nowrap;
}
.art-arrow{
  width: 14px; height: 14px; color: var(--border);
  flex-shrink: 0; transition: color 0.15s, transform 0.15s;
}
.art-row:hover .art-arrow{ color: var(--signal); transform: translateX(3px); }

/* ---------- RESPONSIVE ---------- */
@media (max-width: 860px){
  section{ padding: 64px 0; }
  nav .links{
    display: none; position: absolute; top: 100%; left: 0; right: 0;
    background: var(--paper); border: 1px solid var(--border);
    border-radius: 10px;
    box-shadow: 0 8px 20px rgba(7,17,32,0.08);
    flex-direction: column; gap: 0; padding: 8px; z-index: 20;
  }
  nav .links.open{ display: flex; }
  nav .links a{ padding: 12px 14px; border-radius: 6px; }
  nav .links a:hover{ background: var(--surface); }
  .nav-toggle{ display: flex; }
  footer .foot-row{ grid-template-columns: 1fr 1fr; gap: 30px; }
}

@media (max-width: 960px){
  .idx-grid{ grid-template-columns: 1fr; gap: 24px; }
  .idx-sidenav{
    position: static; display: flex; align-items: center; gap: 0;
    padding: 12px 16px; overflow-x: auto;
    -webkit-overflow-scrolling: touch; border-radius: 10px;
  }
  .sidenav-title{ display: none; }
  .idx-sidenav nav{ flex-direction: row; gap: 4px; flex-wrap: nowrap; }
  .snav-link{
    white-space: nowrap; padding: 6px 12px;
    border-left: none; border-bottom: 2px solid transparent; border-radius: 6px;
  }
  .snav-link.active{ border-left: none; border-bottom-color: var(--signal); }
}

@media (max-width: 680px){
  .idx-hero h1{ font-size: 30px; }
  .module-header{ grid-template-columns: 40px 1fr; gap: 12px; }
  .module-count{ display: none; }
  .module-icon-wrap{ width: 40px; height: 40px; font-size: 18px; }
  .art-row{ padding: 12px 16px; }
  .art-row.featured-row{ padding-left: 13px; }
  .badge-level{ display: none; }
  .idx-hero-stats{ gap: 0; flex-wrap: wrap; row-gap: 12px; }
  .hstat-sep{ display: none; }
}

@media (max-width: 480px){
  .wrap{ padding: 0 16px; }
  section{ padding: 48px 0; }
  .disclaimer p{ font-size: 11.5px; padding: 0 8px; }
}

@media (max-width: 420px){
  .art-title{ font-size: 13px; white-space: normal; }
  .art-time{ display: none; }
}

@media (prefers-reduced-motion: reduce){
  .art-arrow, .snav-link,
  .idx-search-wrap{ transition: none; }
}