*{
  margin:0;
  padding:0;
  box-sizing:border-box;
}

:root{
  --bg:#020617;
  --panel:rgba(15,23,42,.78);
  --panel2:rgba(8,47,73,.34);
  --line:rgba(56,189,248,.32);
  --cyan:#22d3ee;
  --blue:#38bdf8;
  --violet:#a855f7;
  --text:#eaf2ff;
  --muted:#a9b8d4;
  --danger:#ef4444;
  --ok:#22c55e;
  --warning:#facc15;
  --code-bg:#0b1220;
}

html{
  scroll-behavior:smooth;
}

body{
  min-height:100vh;
  background:
    radial-gradient(circle at top left, rgba(34,211,238,.14), transparent 35%),
    radial-gradient(circle at 85% 8%, rgba(168,85,247,.12), transparent 38%),
    var(--bg);
  color:var(--text);
  font-family:Inter,Segoe UI,Arial,sans-serif;
  overflow-x:hidden;
  user-select:none;
}

/* CAPA DE EFECTOS: INDEPENDIENTE DEL CONTENIDO */
.fx-layer{
  position:fixed;
  inset:0;
  z-index:0;
  pointer-events:none;
  opacity:.16;
  overflow:hidden;
  background-image:
  linear-gradient(
    rgba(56,189,248,.05) 1px,
    transparent 1px
  );
}

@keyframes gridMove{
  from{background-position:0 0}
  to{background-position:0 56px}
}

#matrixCanvas,
#atomsCanvas{
  position:absolute;
  inset:0;
  width:100%;
  height:100%;
}

#bubblesLayer,
#formulasLayer,
#tetrisLayer{
  position:absolute;
  inset:0;
}

.bubble{

  position:absolute;

  bottom:-120px;

  border-radius:50%;

  pointer-events:none;

  backdrop-filter:blur(4px);

  background:

    radial-gradient(
      circle at 35% 35%,
      rgba(255,255,255,.45),
      rgba(34,211,238,.22)
    );

  border:
    1px solid rgba(34,211,238,.42);

  box-shadow:
    0 0 24px rgba(34,211,238,.22),
    inset 0 0 18px rgba(255,255,255,.12);

  opacity:.72;

  animation:
    bubbleFloat linear infinite;

}

@keyframes bubbleFloat{
  from{transform:translateY(110vh) scale(.65); opacity:0}
  10%{opacity:.38}
  80%{opacity:.22}
  to{transform:translateY(-20vh) scale(1.15); opacity:0}
}

.formula{
  position:absolute;
  color:rgba(168,85,247,.42);
  font-family:Consolas,monospace;
  font-size:22px;
  text-shadow:0 0 18px rgba(168,85,247,.28);
  animation:formulaDrift 12s ease-in-out infinite alternate;
}

@keyframes formulaDrift{
  from{transform:translate3d(0,0,0)}
  to{transform:translate3d(36px,-28px,0)}
}

.tetris-block{

  position:absolute;

  width:28px;
  height:28px;

  border-radius:6px;

  background:

    linear-gradient(
      135deg,
      rgba(34,211,238,.65),
      rgba(168,85,247,.32)
    );

  border:
    1px solid rgba(34,211,238,.88);

  box-shadow:
    0 0 28px rgba(34,211,238,.42),
    0 0 46px rgba(168,85,247,.18);

  opacity:.85;

  animation:
    tetrisMove linear infinite;

}

@keyframes tetrisMove{
  from{transform:translateY(-60px) rotate(0deg); opacity:0}
  12%{opacity:.35}
  85%{opacity:.24}
  to{transform:translateY(110vh) rotate(180deg); opacity:0}
}

/* UI GLOBAL */
.topbar{
  position:fixed;
  top:0;
  left:0;
  width:100%;
  min-height:92px;
  z-index:50;
  display:flex;
  justify-content:space-between;
  gap:20px;
  align-items:center;
  padding:18px 28px;
  background:rgba(2,6,23,.82);
  backdrop-filter:blur(16px);
  border-bottom:1px solid var(--line);
}

.topbar h1{
  font-size:clamp(30px,4vw,48px);
  letter-spacing:-1px;
  line-height:1;
}

.topbar p{
  margin-top:12px;
  color:var(--muted);
}

.teacher-pill{
  border:1px solid var(--line);
  background:rgba(8,47,73,.55);
  color:var(--cyan);
  padding:14px 20px;
  border-radius:999px;
  box-shadow:0 0 28px rgba(34,211,238,.12);
  white-space:nowrap;
  font-family:Consolas,monospace;
}

.nav-pills{
  position:fixed;
  top:108px;
  left:0;
  width:100%;
  z-index:40;
  padding:0 28px 16px;
  display:flex;
  gap:12px;
  flex-wrap:wrap;
  background:linear-gradient(to bottom, rgba(2,6,23,.92), rgba(2,6,23,0));
}


.nav-pills a{
  text-decoration:none;
  color:var(--text);
  padding:12px 17px;
  border-radius:999px;
  background:rgba(15,23,42,.86);
  border:1px solid var(--line);
  transition:.25s;
  flex:0 0 auto;
  white-space:nowrap;
}

.nav-pills a:hover{
  color:var(--cyan);
  transform:translateY(-2px);
  box-shadow:0 0 22px rgba(34,211,238,.16);
}

/* SAFE CONTENT AREA */
.safe-shell{
  position:relative;
  z-index:5;
  width:100%;
}

.stage{
  width:min(
    1280px,
    calc(100% - 56px)
  );

  margin:0 auto;

  padding:220px 0 120px;

}

.scene-block{
  scroll-margin-top:180px;
  margin-bottom:34px;
}

.hero-split{
  display:grid;
  grid-template-columns:1.55fr .9fr;
  gap:28px;
  align-items:stretch;
}

.panel{
  position:relative;
  overflow:hidden;
  border:1px solid var(--line);
  border-radius:26px;
  padding:30px;
  background:linear-gradient(135deg, rgba(15,23,42,.86), rgba(8,47,73,.56));
  box-shadow:0 0 38px rgba(34,211,238,.11);
}

.panel:before{
  content:"";
  position:absolute;
  inset:-60%;
  background:linear-gradient(90deg, transparent, rgba(34,211,238,.08), transparent);
  transform:rotate(20deg);
  animation:scan 10s linear infinite;
}

@keyframes scan{
  from{translate:-42% 0}
  to{translate:42% 0}
}

.panel > *{
  position:relative;
  z-index:2;
}

.kicker{
  color:var(--cyan);
  font-size:12px;
  letter-spacing:4px;
  text-transform:uppercase;
  font-weight:800;
  margin-bottom:22px;
}

.hero-title{

  font-size:
    clamp(
      38px,
      4.2vw,
      64px
    );

  line-height:1.02;

  letter-spacing:-2px;

  margin-bottom:22px;

}

.highlight{
  color:var(--cyan);
  text-shadow:0 0 24px rgba(34,211,238,.35);
}

.lead{
  font-size:18px;
  line-height:1.8;
}

.muted{
  color:var(--muted);
  line-height:1.65;
}

.mini-card-grid{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:14px;
  margin-top:24px;
}

.mini-card{
  text-align:center;
  padding:18px;
  border-radius:18px;
  border:1px solid var(--line);
  background:rgba(8,47,73,.45);
}

.mini-card strong{
  display:block;
  color:var(--cyan);
  font-size:22px;
  margin-bottom:8px;
}

.tags{
  display:flex;
  gap:9px;
  flex-wrap:wrap;
  margin-top:24px;
}

.tag{
  background:rgba(168,85,247,.18);
  border:1px solid rgba(168,85,247,.4);
  padding:9px 13px;
  border-radius:999px;
  color:#d8ccff;
}

.section-title{
  border-left:5px solid var(--cyan);
  padding-left:18px;
  font-size:clamp(28px,4vw,42px);
  margin-bottom:24px;
}

.concept-grid{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:18px;
}

.concept-card{
  min-height:180px;
  border:1px solid var(--line);
  border-radius:24px;
  padding:24px;
  background:rgba(15,23,42,.74);
  transition:.25s;
}

.concept-card:hover{
  transform:translateY(-5px);
  box-shadow:0 0 32px rgba(34,211,238,.16);
}

.concept-icon{
  font-size:34px;
  margin-bottom:16px;
}

.concept-card h3{
  color:var(--cyan);
  margin-bottom:12px;
}

.flow{
  display:flex;
  flex-wrap:wrap;
  justify-content:center;
  align-items:center;
  gap:26px;
  margin-top:20px;
}

.flow-node{
  width:260px;
  min-height:180px;

  padding:26px;

  border-radius:24px;

  border:
    1px solid rgba(34,211,238,.28);

  background:
    linear-gradient(
      135deg,
      rgba(15,23,42,.88),
      rgba(8,47,73,.48)
    );

  box-shadow:
    0 0 24px rgba(34,211,238,.08);

  text-align:center;

  transition:.25s;
}

.flow-node:hover{

  transform:
    translateY(-6px);

  box-shadow:
    0 0 36px rgba(34,211,238,.18);

}

.flow-arrow{

  display:flex;
  align-items:center;
  justify-content:center;

  width:70px;
  height:70px;

  border-radius:50%;

  background:
    rgba(34,211,238,.08);

  border:
    1px solid rgba(34,211,238,.18);

  color:var(--cyan);

  font-size:34px;

  box-shadow:
    0 0 18px rgba(34,211,238,.12);

  animation:
    pulse 2s infinite alternate;

}

@keyframes pulse{
  from{opacity:.45; transform:scale(.95)}
  to{opacity:1; transform:scale(1.06)}
}

/* BLOQUES DE CÓDIGO CON COLORES */
.code-window{
  border-radius:22px;
  border:1px solid var(--line);
  overflow:hidden;
  background:var(--code-bg);
  box-shadow:0 0 32px rgba(34,211,238,.14);
}

.code-top{
  display:flex;
  justify-content:space-between;
  align-items:center;
  padding:14px 18px;
  background:#101827;
  border-bottom:1px solid rgba(255,255,255,.08);
}

.lang{
  color:var(--cyan);
  font-family:Consolas,monospace;
  font-weight:800;
}

.code-actions{
  display:flex;
  gap:8px;
}

.code-actions button,
.fx-widget button,
.teacher-panel button{
  cursor:pointer;
  border:1px solid var(--line);
  background:rgba(8,47,73,.72);
  color:white;
  border-radius:12px;
  padding:9px 13px;
  transition:.2s;
}

.code-actions button:hover,
.fx-widget button:hover,
.teacher-panel button:hover{
  color:var(--cyan);
  box-shadow:0 0 16px rgba(34,211,238,.2);
}

pre{
  margin:0;
  padding:24px;
  overflow:auto;
  line-height:1.75;
  color:#dff6ff;
  font-size:15px;
  user-select:text;
  font-family:Consolas, "Courier New", monospace;
  background:var(--code-bg);
}

code{
  font-family:Consolas, "Courier New", monospace;
  user-select:text;
}

.tok-keyword{color:#c084fc;font-weight:800}
.tok-type{color:#38bdf8}
.tok-string{color:#86efac}
.tok-number{color:#facc15}
.tok-comment{color:#64748b;font-style:italic}
.tok-function{color:#22d3ee}
.tok-property{color:#93c5fd}
.tok-tag{color:#fb7185}
.tok-attr{color:#fbbf24}
.tok-symbol{color:#e879f9}
.tok-builtin{color:#60a5fa}
.tok-operator{color:#f472b6}

.table-wrap{
  overflow:auto;
  border:1px solid var(--line);
  border-radius:22px;
}

table{
  width:100%;
  border-collapse:collapse;
  background:rgba(15,23,42,.76);
}

th,td{
  padding:16px;
  border-bottom:1px solid rgba(56,189,248,.16);
  text-align:left;
}

th{
  color:var(--cyan);
  background:rgba(8,47,73,.58);
}

.practice-list{
  display:grid;
  gap:16px;
}

.practice-item{
  padding:20px;
  border-radius:20px;
  border:1px solid var(--line);
  background:rgba(15,23,42,.76);
}

/* LOGIN */
.access-overlay{
  position:fixed;
  inset:0;
  z-index:10000;
  background:radial-gradient(circle at top, rgba(34,211,238,.14), transparent 38%), #020617;
  display:flex;
  align-items:center;
  justify-content:center;
  padding:24px;
}

.access-card{
  width:min(430px,100%);
  border:1px solid var(--line);
  border-radius:28px;
  padding:30px;
  background:rgba(15,23,42,.92);
  box-shadow:0 0 60px rgba(34,211,238,.18);
}

.access-badge{
  color:var(--cyan);
  letter-spacing:3px;
  font-size:12px;
  margin-bottom:18px;
}

.access-card h1{
  font-size:38px;
  margin-bottom:12px;
}

.access-card p,
.access-help,
.note{
  color:var(--muted);
  line-height:1.6;
}

.access-card input,
.teacher-panel input,
.teacher-panel select{
  width:100%;
  padding:14px;
  margin:16px 0;
  border-radius:14px;
  border:1px solid var(--line);
  background:#0f172a;
  color:white;
}

.access-card button{
  width:100%;
  padding:14px;
  border-radius:14px;
  border:1px solid var(--line);
  color:white;
  background:linear-gradient(135deg, rgba(14,165,233,.9), rgba(168,85,247,.7));
  cursor:pointer;
  font-weight:800;
}

.access-error{
  margin-top:14px;
  color:#fb7185;
  min-height:24px;
}

.access-help{
  margin-top:18px;
  font-size:13px;
}

/* PANEL PROFESOR */
.teacher-panel{
  position:fixed;
  top:110px;
  right:22px;
  width:360px;
  max-width:calc(100% - 44px);
  z-index:10001;
  border:1px solid var(--line);
  border-radius:24px;
  padding:18px;
  background:rgba(2,6,23,.96);
  box-shadow:0 0 50px rgba(34,211,238,.22);
}

.hidden{
  display:none!important;
}

.panel-top{
  display:flex;
  justify-content:space-between;
  align-items:center;
  margin-bottom:14px;
}

.panel-top button{
  width:42px;
}

.teacher-panel label,
.fx-widget label{
  display:block;
  color:var(--cyan);
  margin-top:14px;
  font-size:13px;
}

.token-view{
  padding:12px;
  border-radius:14px;
  background:#0f172a;
  border:1px solid rgba(56,189,248,.18);
  word-break:break-all;
  margin-top:8px;
}

.secure{
  color:var(--ok);
}

.danger{
  background:rgba(239,68,68,.75)!important;
}

/* WIDGET MOVIBLE DE EFECTOS */
.fx-widget{
  position:fixed;
  right:20px;
  bottom:20px;
  width:265px;
  z-index:100;
  border:1px solid var(--line);
  border-radius:20px;
  overflow:hidden;
  background:rgba(2,6,23,.88);
  backdrop-filter:blur(12px);
  box-shadow:0 0 34px rgba(34,211,238,.18);
}

.fx-widget-head{
  display:flex;
  justify-content:space-between;
  align-items:center;
  padding:12px 14px;
  cursor:move;
  background:rgba(8,47,73,.72);
  color:var(--cyan);
}

.fx-widget-head button{
  width:38px;
}

.fx-widget-body{
  padding:14px;
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:10px;
}

.fx-widget-body label,
.fx-widget-body input{
  grid-column:1 / -1;
}

.fx-widget.minimized{
  width:190px;
}

.fx-widget.minimized .fx-widget-body{
  display:none;
}

/* PRESENTACIÓN */
.presentation .topbar,
.presentation .nav-pills,
.presentation .fx-widget{
  opacity:.08;
  transition:.4s;
}

.presentation .topbar:hover,
.presentation .nav-pills:hover,
.presentation .fx-widget:hover{
  opacity:1;
}

@media(max-width:900px){
  .topbar{
    position:relative;
    flex-direction:column;
    align-items:flex-start;
  }
  .nav-pills{
    position:relative;
    top:auto;
    padding:20px;
  }
  .stage{
    padding-top:40px;
    width:calc(100% - 24px);
  }
  .hero-split,
  .concept-grid,
  .flow{
    grid-template-columns:1fr;
  }
  .flow-arrow{
    transform:rotate(90deg);
  }
  .mini-card-grid{
    grid-template-columns:1fr;
  }
}

.scene-menu{

  display:flex;

  gap:10px;

  flex-wrap:wrap;

  justify-content:center;

  align-items:center;

  max-width:700px;

  margin:0 auto;

}

.scene-btn{

  padding:10px 14px;

  border-radius:12px;

  border:1px solid var(--line);

  background:rgba(15,23,42,.72);

  color:var(--text);

  cursor:pointer;

  transition:.25s;

  font-size:14px;

  font-weight:700;

  white-space:nowrap;

}

.scene-btn:hover{

  color:var(--cyan);

  border-color:rgba(34,211,238,.55);

  transform:translateY(-2px);

  box-shadow:
    0 0 18px rgba(34,211,238,.18);

}

.scene-btn{

  padding:12px 18px;

  border-radius:14px;

  border:1px solid var(--line);

  background:rgba(15,23,42,.82);

  color:var(--text);

  cursor:pointer;

  transition:.25s;

  font-weight:700;

}

.scene-btn:hover{

  color:var(--cyan);

  transform:translateY(-2px);

  box-shadow:0 0 20px rgba(34,211,238,.22);

}