/* ============================================================
   ALGOTRADING ACADEMY — DESIGN SYSTEM
   Palette: Ink #0B0F17 · Panel #121A28 · Panel-2 #17drop
   ============================================================ */

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

:root{
  --ink:        #0B0F17;
  --panel:      #121A28;
  --panel-2:    #17233A;
  --line:       #24314A;
  --paper:      #E9EDF5;
  --muted:      #8996AC;
  --muted-2:    #5E6B84;
  --signal:     #35D999;
  --signal-dim: #1D6B4C;
  --long:       #35D999;
  --short:      #FF6B6B;
  --amber:      #F2B84B;

  --f-display: 'Space Grotesk', sans-serif;
  --f-body: 'Inter', sans-serif;
  --f-mono: 'JetBrains Mono', monospace;

  --radius: 3px;
  --container: 1180px;
}

*{ box-sizing: border-box; margin:0; padding:0; }
html{ scroll-behavior: smooth; }
body{
  background: var(--ink);
  color: var(--paper);
  font-family: var(--f-body);
  line-height: 1.55;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}
body::before{
  content:"";
  position: fixed; inset:0;
  background-image:
    linear-gradient(rgba(233,237,245,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(233,237,245,0.025) 1px, transparent 1px);
  background-size: 42px 42px;
  pointer-events: none;
  z-index: 0;
}
img{ max-width:100%; display:block; }
a{ color:inherit; text-decoration:none; }
ul{ list-style:none; }
button{ font-family: inherit; cursor:pointer; }
input, textarea, select{ font-family: inherit; }

.wrap{ max-width: var(--container); margin: 0 auto; padding: 0 28px; position:relative; z-index:1; }

::selection{ background: var(--signal); color: var(--ink); }

@media (prefers-reduced-motion: reduce){
  *{ animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

/* ---------- focus ---------- */
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible{
  outline: 2px solid var(--signal);
  outline-offset: 2px;
}

/* ============================================================
   HEADER
   ============================================================ */
header{
  position: sticky; top:0; z-index: 50;
  background: rgba(11,15,23,0.88);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav{
  display:flex; align-items:center; justify-content:space-between;
  height: 64px;
}
.logo{
  font-family: var(--f-display);
  font-weight:700; font-size: 1.05rem;
  letter-spacing: -0.01em;
  display:flex; align-items:center; gap:8px;
}
.logo .tick{
  width:9px; height:9px; background: var(--signal); border-radius:1px;
  box-shadow: 0 0 10px var(--signal);
}
.logo .sub{ color: var(--muted); font-weight:500; }

.nav-links{ display:flex; gap: 28px; align-items:center; }
.nav-links a{
  font-size: 0.85rem; color: var(--muted); font-weight:500;
  text-transform: uppercase; letter-spacing: 0.06em;
  transition: color .15s;
}
.nav-links a:hover{ color: var(--paper); }

.nav-right{ display:flex; align-items:center; gap:16px; }

.lang-toggle{
  display:flex; border:1px solid var(--line); border-radius: var(--radius);
  overflow:hidden; font-family: var(--f-mono); font-size:0.72rem;
}
.lang-toggle button{
  background:transparent; color: var(--muted); border:none;
  padding: 7px 12px; font-weight:600; letter-spacing:0.04em;
  transition: all .15s;
}
.lang-toggle button.active{ background: var(--signal); color: var(--ink); }

.burger{ display:none; background:none; border:none; color:var(--paper); font-size:1.3rem; }

@media (max-width: 860px){
  .nav-links{ display:none; }
  .burger{ display:block; }
}

/* ============================================================
   HERO
   ============================================================ */
.hero{
  padding: 88px 0 56px;
  border-bottom: 1px solid var(--line);
  position:relative; overflow:hidden;
}
.hero-eyebrow{
  font-family: var(--f-mono); font-size: 0.75rem; color: var(--signal);
  letter-spacing: 0.12em; text-transform:uppercase;
  display:flex; align-items:center; gap:10px; margin-bottom:22px;
}
.hero-eyebrow::before{
  content:""; width:22px; height:1px; background: var(--signal);
}
.hero h1{
  font-family: var(--f-display); font-weight:700;
  font-size: clamp(2.4rem, 5.4vw, 4.1rem);
  line-height: 1.04; letter-spacing: -0.02em;
  max-width: 880px;
  margin-bottom: 24px;
}
.hero h1 em{
  font-style:normal; color: var(--signal);
}
.hero p.lead{
  font-size: 1.15rem; color: var(--muted); max-width: 620px; margin-bottom: 36px;
}
.hero-cta{ display:flex; gap:14px; flex-wrap:wrap; margin-bottom: 56px; }

.btn{
  display:inline-flex; align-items:center; gap:8px;
  padding: 13px 24px; border-radius: var(--radius);
  font-weight:600; font-size:0.92rem; border:1px solid transparent;
  transition: all .15s;
}
.btn-primary{ background: var(--signal); color: var(--ink); }
.btn-primary:hover{ background:#4de3a8; transform: translateY(-1px); }
.btn-ghost{ border-color: var(--line); color: var(--paper); }
.btn-ghost:hover{ border-color: var(--muted); }

.hero-stats{
  display:grid; grid-template-columns: repeat(4,1fr); gap:0;
  border-top: 1px solid var(--line);
}
.hero-stats div{
  padding: 22px 24px 0; border-left: 1px solid var(--line);
}
.hero-stats div:first-child{ border-left:none; padding-left:0; }
.hero-stats .num{
  font-family: var(--f-mono); font-size: 1.9rem; font-weight:600; color: var(--signal);
  display:block;
}
.hero-stats .lbl{ font-size:0.8rem; color: var(--muted); margin-top:4px; }

@media (max-width: 700px){
  .hero-stats{ grid-template-columns: repeat(2,1fr); row-gap:20px; }
  .hero-stats div{ border-left:none; padding-left:0; }
}

/* ticker */
.ticker-strip{
  border-bottom: 1px solid var(--line);
  background: var(--panel);
  overflow:hidden; white-space:nowrap;
  padding: 11px 0;
}
.ticker-track{
  display:inline-flex; gap: 40px; animation: scrollTicker 42s linear infinite;
  font-family: var(--f-mono); font-size: 0.78rem; color: var(--muted);
}
.ticker-track span b{ color: var(--signal); margin-right:6px; }
@keyframes scrollTicker{
  from{ transform: translateX(0); }
  to{ transform: translateX(-50%); }
}

/* ============================================================
   SECTION HEADERS
   ============================================================ */
.section{ padding: 84px 0; border-bottom: 1px solid var(--line); }
.section-head{
  display:flex; justify-content:space-between; align-items:flex-end;
  gap: 24px; margin-bottom: 44px; flex-wrap:wrap;
}
.section-eyebrow{
  font-family: var(--f-mono); font-size:0.72rem; color: var(--muted-2);
  text-transform:uppercase; letter-spacing:0.12em; margin-bottom:10px;
}
.section-head h2{
  font-family: var(--f-display); font-weight:700; font-size: clamp(1.7rem, 3vw, 2.4rem);
  letter-spacing:-0.01em;
}
.section-head p{ color: var(--muted); max-width: 480px; font-size:0.98rem; }

/* ============================================================
   LEVELS
   ============================================================ */
.levels-grid{ display:grid; grid-template-columns: repeat(3,1fr); gap:1px; background: var(--line); border:1px solid var(--line); }
.level-card{ background: var(--panel); padding: 32px 28px; }
.level-card .lv-mark{
  font-family: var(--f-mono); font-size:0.72rem; letter-spacing:0.1em;
  display:inline-flex; align-items:center; gap:8px; margin-bottom:18px;
  padding: 4px 10px; border-radius: var(--radius); text-transform:uppercase;
}
.lv-mark.basico{ background: rgba(53,217,153,0.12); color: var(--signal); }
.lv-mark.intermedio{ background: rgba(242,184,75,0.12); color: var(--amber); }
.lv-mark.avanzado{ background: rgba(255,107,107,0.12); color: var(--short); }
.level-card h3{ font-family: var(--f-display); font-size:1.25rem; margin-bottom:10px; }
.level-card p{ color: var(--muted); font-size:0.92rem; margin-bottom: 18px; }
.level-card .candles{ display:flex; gap:4px; align-items:flex-end; height:34px; }
.candle{ width:6px; border-radius:1px; }
@media (max-width: 780px){ .levels-grid{ grid-template-columns:1fr; } }

/* ============================================================
   CATEGORY GRID
   ============================================================ */
.cat-grid{
  display:grid; grid-template-columns: repeat(3, 1fr); gap:1px;
  background: var(--line); border:1px solid var(--line);
}
.cat-card{
  background: var(--panel); padding: 28px 26px; cursor:pointer;
  transition: background .15s; position:relative;
}
.cat-card:hover{ background: var(--panel-2); }
.cat-card .cat-num{ font-family: var(--f-mono); color: var(--muted-2); font-size:0.78rem; margin-bottom:20px; display:block; }
.cat-card h3{ font-family: var(--f-display); font-size:1.12rem; margin-bottom:10px; line-height:1.3; }
.cat-card p{ color: var(--muted); font-size:0.85rem; margin-bottom:18px; }
.cat-card .cat-count{ font-family: var(--f-mono); font-size:0.74rem; color: var(--signal); display:flex; align-items:center; gap:6px; }
.cat-card .cat-count::after{ content:"→"; margin-left:auto; color: var(--muted-2); transition: transform .15s; }
.cat-card:hover .cat-count::after{ transform: translateX(4px); color:var(--signal); }

@media (max-width: 980px){ .cat-grid{ grid-template-columns: repeat(2,1fr); } }
@media (max-width: 640px){ .cat-grid{ grid-template-columns: 1fr; } }

/* ============================================================
   ARTICLES / FILTER BAR
   ============================================================ */
.filter-bar{
  display:flex; flex-wrap:wrap; gap:10px; margin-bottom: 36px;
  align-items:center;
}
.filter-bar .fb-label{
  font-family: var(--f-mono); font-size:0.72rem; color: var(--muted-2);
  text-transform:uppercase; letter-spacing:0.08em; margin-right:6px;
}
.chip{
  padding: 7px 14px; border:1px solid var(--line); border-radius: 999px;
  font-size:0.8rem; color: var(--muted); background:transparent;
  transition: all .15s;
}
.chip:hover{ border-color: var(--muted); color: var(--paper); }
.chip.active{ background: var(--paper); color: var(--ink); border-color: var(--paper); font-weight:600; }

.search-box{
  margin-left:auto; position:relative; min-width:220px; flex:1; max-width: 320px;
}
.search-box input{
  width:100%; background: var(--panel); border:1px solid var(--line); color: var(--paper);
  padding: 9px 14px 9px 34px; border-radius: var(--radius); font-size:0.85rem;
}
.search-box::before{
  content:"⌕"; position:absolute; left:12px; top:50%; transform:translateY(-50%);
  color: var(--muted-2); font-size:0.95rem;
}

.results-meta{ font-family: var(--f-mono); font-size:0.78rem; color: var(--muted-2); margin-bottom:20px; }

.article-grid{ display:grid; grid-template-columns: repeat(3, 1fr); gap:1px; background: var(--line); border:1px solid var(--line); }
.article-card{ background: var(--panel); padding: 24px 22px; display:flex; flex-direction:column; gap:12px; }
.article-card .ac-top{ display:flex; justify-content:space-between; align-items:center; }
.ac-cat{ font-family: var(--f-mono); font-size:0.7rem; color: var(--muted-2); text-transform:uppercase; letter-spacing:0.05em; }
.ac-level{
  font-family: var(--f-mono); font-size:0.66rem; padding:3px 8px; border-radius:999px;
  text-transform:uppercase; letter-spacing:0.05em; white-space:nowrap;
}
.ac-level.basico{ background: rgba(53,217,153,0.12); color: var(--signal); }
.ac-level.intermedio{ background: rgba(242,184,75,0.12); color: var(--amber); }
.ac-level.avanzado{ background: rgba(255,107,107,0.12); color: var(--short); }
.article-card h4{ font-family: var(--f-display); font-size:1.02rem; line-height:1.35; font-weight:600; }
.article-card p{ color: var(--muted); font-size:0.86rem; flex:1; }
.article-card .ac-read{ font-family: var(--f-mono); font-size:0.74rem; color: var(--signal); display:flex; align-items:center; gap:6px; margin-top:auto; }

@media (max-width: 980px){ .article-grid{ grid-template-columns: repeat(2,1fr); } }
@media (max-width: 640px){ .article-grid{ grid-template-columns: 1fr; } .search-box{ max-width:none; margin-left:0; width:100%; } }

.load-more-wrap{ text-align:center; margin-top: 40px; }

/* ============================================================
   ABOUT / MISSION
   ============================================================ */
.about-grid{ display:grid; grid-template-columns: 1.1fr 0.9fr; gap: 60px; align-items:start; }
.about-grid h2{ font-family: var(--f-display); font-size: clamp(1.6rem,2.6vw,2.1rem); margin-bottom:20px; line-height:1.25; }
.about-grid p{ color: var(--muted); margin-bottom:16px; }
.about-list{ display:flex; flex-direction:column; gap:0; border-top:1px solid var(--line); }
.about-list li{
  padding: 18px 0; border-bottom:1px solid var(--line);
  display:flex; gap:16px; align-items:flex-start;
}
.about-list .ai-mark{ font-family: var(--f-mono); color: var(--signal); font-size:0.8rem; padding-top:2px; }
.about-list strong{ display:block; font-family: var(--f-display); font-size:0.98rem; margin-bottom:4px; }
.about-list span{ color: var(--muted); font-size:0.86rem; }
@media (max-width: 860px){ .about-grid{ grid-template-columns:1fr; gap:32px; } }

/* ============================================================
   CONTACT
   ============================================================ */
.contact-grid{ display:grid; grid-template-columns: 0.85fr 1.15fr; gap: 56px; }
.contact-info h2{ font-family: var(--f-display); font-size: clamp(1.6rem,2.6vw,2.1rem); margin-bottom:18px; line-height:1.25; }
.contact-info p{ color: var(--muted); margin-bottom: 26px; }
.contact-meta{ display:flex; flex-direction:column; gap:14px; }
.contact-meta div{ display:flex; gap:12px; align-items:center; font-size:0.9rem; }
.contact-meta .cm-tag{ font-family: var(--f-mono); font-size:0.7rem; color: var(--muted-2); text-transform:uppercase; letter-spacing:0.06em; width:70px; flex-shrink:0; }

.form-panel{ background: var(--panel); border:1px solid var(--line); padding: 32px; border-radius: var(--radius); }
.form-row{ display:grid; grid-template-columns: 1fr 1fr; gap:16px; margin-bottom:16px; }
.field{ display:flex; flex-direction:column; gap:8px; }
.field.full{ grid-column: 1 / -1; }
.field label{ font-family: var(--f-mono); font-size:0.72rem; color: var(--muted); text-transform:uppercase; letter-spacing:0.06em; }
.field input, .field textarea{
  background: var(--ink); border:1px solid var(--line); color: var(--paper);
  padding: 12px 14px; border-radius: var(--radius); font-size:0.92rem;
  transition: border-color .15s;
}
.field input:focus, .field textarea:focus{ border-color: var(--signal); }
.field textarea{ resize: vertical; min-height:120px; }
.form-note{ font-size:0.78rem; color: var(--muted-2); margin-top:14px; line-height:1.5; }
.form-status{ font-family: var(--f-mono); font-size:0.82rem; margin-top:14px; display:none; }
.form-status.show{ display:block; }
.form-status.ok{ color: var(--signal); }

@media (max-width: 860px){ .contact-grid{ grid-template-columns:1fr; } .form-row{ grid-template-columns:1fr; } }

/* ============================================================
   FOOTER
   ============================================================ */
footer{ padding: 44px 0; }
.footer-grid{ display:flex; justify-content:space-between; align-items:center; flex-wrap:wrap; gap:16px; }
.footer-grid .f-left{ display:flex; flex-direction:column; gap:6px; }
.footer-grid .f-logo{ font-family: var(--f-display); font-weight:700; }
.footer-grid .f-note{ color: var(--muted-2); font-size:0.8rem; max-width:420px; }
.footer-links{ display:flex; gap:22px; }
.footer-links a{ color: var(--muted); font-size:0.85rem; }
.footer-links a:hover{ color: var(--paper); }

/* ============================================================
   MODAL (article preview)
   ============================================================ */
.modal-overlay{
  position:fixed; inset:0; background: rgba(11,15,23,0.78); backdrop-filter: blur(4px);
  display:none; align-items:center; justify-content:center; z-index:100; padding:24px;
}
.modal-overlay.show{ display:flex; }
.modal-box{
  background: var(--panel); border:1px solid var(--line); max-width:560px; width:100%;
  padding: 34px; border-radius: var(--radius); position:relative;
}
.modal-close{
  position:absolute; top:18px; right:18px; background:none; border:none; color:var(--muted);
  font-size:1.3rem; line-height:1;
}
.modal-close:hover{ color: var(--paper); }
.modal-box .ac-level{ margin-bottom:16px; display:inline-block; }
.modal-box h3{ font-family: var(--f-display); font-size:1.4rem; margin-bottom:14px; line-height:1.3; }
.modal-box p{ color: var(--muted); margin-bottom:20px; }
.modal-box .modal-cat{ font-family: var(--f-mono); font-size:0.75rem; color: var(--signal); margin-bottom:10px; display:block; }
.modal-foot{ border-top:1px solid var(--line); padding-top:18px; font-size:0.8rem; color: var(--muted-2); }

/* utility */
.hidden{ display:none !important; }