:root{
  --bg:#0B1220;
  --panel:#0F1B2E;
  --card:#122043;
  --card2:#101B36;
  --text:#EAF0FF;
  --muted:#9CB0D1;
  --border:rgba(234,240,255,.12);

  --neon:#36F5C5;
  --blue:#6AA6FF;
  --violet:#8C7BFF;
  --danger:#FF4D6D;

  --shadow: 0 16px 40px rgba(0,0,0,.35);
  --r:18px;
  --r2:14px;

  --sans: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji","Segoe UI Emoji";
  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono","Courier New", monospace;
}

*{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }
body{
  margin:0;
  font-family:var(--sans);
  color:var(--text);
  background:
    radial-gradient(900px 600px at 20% -10%, rgba(106,166,255,.30), transparent 60%),
    radial-gradient(900px 600px at 110% 25%, rgba(54,245,197,.18), transparent 55%),
    radial-gradient(700px 520px at 70% 110%, rgba(140,123,255,.18), transparent 55%),
    var(--bg);
  overflow-x:hidden;
}

a{ color:inherit; text-decoration:none; }
p{ margin:0; color:var(--muted); line-height:1.65; }
h1,h2,h3{ margin:0; letter-spacing:-.02em; }
small{ color:var(--muted); }

.wrap{ max-width:1180px; margin:0 auto; padding:0 18px; }

.grid-bg{
  position:fixed; inset:0;
  background-image:
    linear-gradient(rgba(234,240,255,.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(234,240,255,.06) 1px, transparent 1px);
  background-size: 48px 48px;
  opacity:.20;
  pointer-events:none;
  mask-image: radial-gradient(circle at 40% 20%, rgba(0,0,0,.95), transparent 70%);
}

/* Header */
header{
  position:sticky; top:0; z-index:50;
  backdrop-filter: blur(12px);
  background: linear-gradient(180deg, rgba(11,18,32,.92), rgba(11,18,32,.55));
  border-bottom: 1px solid var(--border);
}
.nav{
  display:flex; align-items:center; justify-content:space-between;
  padding:14px 0; gap:12px;
}
.brand{
  display:flex; align-items:center; gap:12px;
}
.logo{
  width:40px; height:40px; border-radius:14px;
  background: conic-gradient(from 210deg, var(--neon), var(--blue), var(--violet), var(--neon));
  box-shadow: var(--shadow);
  position:relative;
  overflow:hidden;
}
.logo::after{
  content:"";
  position:absolute; inset:-20px;
  background: radial-gradient(circle at 35% 35%, rgba(255,255,255,.55), transparent 45%);
  transform: rotate(14deg);
}
.brand .t{ display:flex; flex-direction:column; line-height:1.1; }
.brand strong{ font-size:14px; }
.brand span{ font-size:12px; color:var(--muted); }

.nav-links{
  display:flex; gap:10px; align-items:center; flex-wrap:wrap;
}
.nav-links a{
  font-size:13px;
  color: rgba(234,240,255,.86);
  padding:10px 10px;
  border-radius:12px;
  transition: background .15s ease, color .15s ease, border-color .15s ease;
  border:1px solid transparent;
}
.nav-links a:hover{
  background: rgba(234,240,255,.06);
  color: var(--text);
  border-color: rgba(106,166,255,.30);
}

.btn{
  display:inline-flex; align-items:center; justify-content:center;
  gap:10px;
  padding:10px 14px;
  border-radius: 14px;
  border: 1px solid var(--border);
  font-weight:900;
  font-size:13px;
  color: var(--text);
  background: rgba(15,27,46,.55);
  box-shadow: 0 10px 24px rgba(0,0,0,.25);
  transition: transform .08s ease, border-color .15s ease, background .15s ease;
  cursor:pointer;
  user-select:none;
  white-space:nowrap;
}
.btn:hover{ border-color: rgba(106,166,255,.55); background: rgba(15,27,46,.72); }
.btn:active{ transform: translateY(1px); }

.btn.primary{
  background: linear-gradient(135deg, rgba(54,245,197,.22), rgba(106,166,255,.18));
  border-color: rgba(54,245,197,.35);
}
.btn.primary:hover{ border-color: rgba(54,245,197,.65); }
.btn.ghost{
  background: transparent;
  border-color: rgba(234,240,255,.10);
  color: rgba(234,240,255,.88);
  box-shadow:none;
}
.btn.ghost:hover{ background: rgba(234,240,255,.06); color:var(--text); }

/* Hero */
.hero{ padding:56px 0 30px; }
.kicker{
  display:inline-flex; gap:10px; align-items:center;
  padding:8px 10px;
  border-radius:999px;
  border:1px solid rgba(54,245,197,.30);
  background: rgba(54,245,197,.10);
  color: rgba(234,240,255,.92);
  font-size:12px;
  font-weight:950;
  letter-spacing:.2px;
  margin-bottom:14px;
}
.kicker .dot{
  width:8px; height:8px; border-radius:999px;
  background: var(--neon);
  box-shadow: 0 0 18px rgba(54,245,197,.55);
}
.hero-grid{
  display:grid;
  grid-template-columns: 1.15fr .85fr;
  gap:18px;
  align-items:stretch;
}
.hero h1{
  font-size:46px;
  line-height:1.06;
  margin:0 0 12px;
}
.hero p{ font-size:15px; margin:0 0 18px; max-width:60ch; }

.card{
  border-radius: var(--r);
  border:1px solid var(--border);
  background: rgba(15,27,46,.40);
  box-shadow: var(--shadow);
  padding:16px;
}
.card h3{ font-size:16px; margin-bottom:10px; }

.chips{ display:flex; flex-wrap:wrap; gap:10px; margin-top:14px; }
.chip{
  display:inline-flex; align-items:center; gap:8px;
  padding:8px 10px;
  border-radius:999px;
  border:1px solid rgba(234,240,255,.10);
  background: rgba(15,27,46,.35);
  font-size:12px;
  color: var(--muted);
}
.chip b{ color: rgba(234,240,255,.92); }

.radar-visual{
  margin-top:10px;
  border-radius: 16px;
  border:1px solid rgba(234,240,255,.10);
  background: radial-gradient(circle at 50% 50%, rgba(54,245,197,.14), rgba(11,18,32,.55));
  height: 220px;
  position:relative;
  overflow:hidden;
}
.ring{
  position:absolute; inset: -30px;
  border-radius: 999px;
  border:1px solid rgba(234,240,255,.10);
  opacity:.55;
}
.ring.r2{ inset: 16px; opacity:.45; }
.ring.r3{ inset: 62px; opacity:.35; }

.sweep{
  position:absolute;
  width: 260px; height: 260px;
  border-radius: 999px;
  left: 50%; top: 50%;
  transform: translate(-50%,-50%);
  background: conic-gradient(from 0deg,
    rgba(54,245,197,.00),
    rgba(54,245,197,.00),
    rgba(54,245,197,.22),
    rgba(54,245,197,.00),
    rgba(54,245,197,.00));
  animation: sweep 3.4s linear infinite;
  opacity:.95;
  mix-blend-mode: screen;
}
@keyframes sweep{
  from{ transform: translate(-50%,-50%) rotate(0deg); }
  to{ transform: translate(-50%,-50%) rotate(360deg); }
}
.blip{
  position:absolute;
  width:8px; height:8px;
  border-radius: 999px;
  background: var(--neon);
  box-shadow: 0 0 18px rgba(54,245,197,.65);
  opacity:.9;
}
.blip::after{
  content:"";
  position:absolute; inset:-10px;
  border-radius: 999px;
  border:1px solid rgba(54,245,197,.28);
  animation: ping 1.8s ease-out infinite;
}
@keyframes ping{
  0%{ transform: scale(.3); opacity:.75; }
  100%{ transform: scale(1.8); opacity:0; }
}

/* Sections */
section{ padding: 46px 0; }
.section-title{
  display:flex; align-items:flex-end; justify-content:space-between;
  gap:14px; margin-bottom:16px;
}
.section-title h2{ font-size:22px; }
.section-title .note{
  color: var(--muted);
  font-size:12px;
  max-width: 60ch;
  text-align:right;
}

.cards{
  display:grid;
  grid-template-columns: repeat(12, 1fr);
  gap:14px;
}
.cards .card{ grid-column: span 4; }

.icon{
  width:28px; height:28px; border-radius: 12px;
  border:1px solid rgba(234,240,255,.12);
  background: linear-gradient(135deg, rgba(106,166,255,.20), rgba(140,123,255,.12));
  display:inline-flex; align-items:center; justify-content:center;
  font-size:14px;
  margin-right:10px;
}

ul{ margin:10px 0 0 18px; color: rgba(234,240,255,.92); line-height:1.55; }
li{ margin:7px 0; }

.badge{
  display:inline-flex; align-items:center; gap:8px;
  padding:6px 10px;
  border-radius:999px;
  border:1px solid rgba(54,245,197,.28);
  background: rgba(54,245,197,.10);
  color: rgba(234,240,255,.92);
  font-size:12px;
  font-weight:950;
  white-space:nowrap;
}

/* Course layout */
.course-layout{
  display:grid;
  grid-template-columns: 330px 1fr;
  gap:14px;
  padding: 24px 0 50px;
}
.sidebar{
  position:sticky;
  top:88px;
  height: calc(100vh - 110px);
  overflow:auto;
  padding-right:6px;
}
.sidebar .box{
  border:1px solid var(--border);
  border-radius: var(--r);
  background: rgba(15,27,46,.35);
  box-shadow: var(--shadow);
  padding:12px;
}
.sidebar h3{ font-size:14px; margin: 6px 0 10px; }
.search{
  width:100%;
  padding:10px 12px;
  border-radius: 14px;
  border:1px solid rgba(234,240,255,.12);
  background: rgba(15,27,46,.35);
  color: var(--text);
  outline:none;
}
.search::placeholder{ color: rgba(156,176,209,.75); }

.nav-group{ margin-top:10px; }
.nav-group .group-title{
  font-size:12px;
  color: var(--muted);
  letter-spacing:.16px;
  text-transform: uppercase;
  margin: 12px 0 8px;
  font-weight:950;
}
.nav-item{
  display:block;
  padding:10px 10px;
  border-radius: 14px;
  border:1px solid transparent;
  background: rgba(15,27,46,.22);
  margin:6px 0;
  transition: background .15s ease, border-color .15s ease;
}
.nav-item:hover{
  background: rgba(15,27,46,.40);
  border-color: rgba(106,166,255,.30);
}
.nav-item.active{
  background: linear-gradient(135deg, rgba(54,245,197,.14), rgba(106,166,255,.10));
  border-color: rgba(54,245,197,.35);
}
.nav-item .t{ font-weight:950; font-size:13px; }
.nav-item .d{ font-size:12px; color: var(--muted); margin-top:3px; }

.main{
  border:1px solid var(--border);
  border-radius: var(--r);
  background: rgba(15,27,46,.30);
  box-shadow: var(--shadow);
  padding:16px;
}
.breadcrumb{
  display:flex; flex-wrap:wrap; gap:8px;
  font-size:12px; color: var(--muted);
  margin-bottom:10px;
}
.breadcrumb a{ color: rgba(234,240,255,.90); }
.h1{
  font-size:26px;
  margin-bottom:8px;
}
.meta-row{
  display:flex; gap:10px; flex-wrap:wrap; align-items:center;
  margin: 10px 0 14px;
}
.meta-pill{
  display:inline-flex; gap:8px; align-items:center;
  padding:8px 10px;
  border-radius:999px;
  border:1px solid rgba(234,240,255,.10);
  background: rgba(15,27,46,.35);
  font-size:12px;
  color: var(--muted);
}
.meta-pill b{ color: rgba(234,240,255,.92); }

.hr{
  height:1px; background: rgba(234,240,255,.10);
  margin: 14px 0;
}

.two-col{
  display:grid;
  grid-template-columns: 1fr 1fr;
  gap:14px;
}
.note{
  font-size:12px; color: var(--muted);
}

.table{
  width:100%;
  border-collapse: collapse;
  font-size:13px;
  overflow:hidden;
  border-radius: 14px;
  border:1px solid rgba(234,240,255,.10);
}
.table th,.table td{
  padding:12px 12px;
  border-bottom:1px solid rgba(234,240,255,.10);
  vertical-align:top;
}
.table th{
  text-align:left;
  background: rgba(11,18,32,.45);
  font-size:12px;
  text-transform: uppercase;
  letter-spacing:.14px;
}
.table tr:last-child td{ border-bottom:none; }

/* Footer */
footer{
  border-top:1px solid var(--border);
  background: rgba(11,18,32,.65);
  padding: 26px 0;
}
.footer-grid{
  display:grid;
  grid-template-columns: 1.2fr .8fr;
  gap:14px;
}
.social{ display:flex; gap:10px; flex-wrap:wrap; justify-content:flex-end; }
.social a{
  border:1px solid rgba(234,240,255,.12);
  background: rgba(15,27,46,.35);
  padding:10px 12px;
  border-radius: 14px;
  font-size:12px;
  color: rgba(234,240,255,.90);
}
.social a:hover{ border-color: rgba(106,166,255,.55); background: rgba(15,27,46,.55); }

/* Responsive */
@media (max-width: 980px){
  .hero-grid{ grid-template-columns:1fr; }
  .cards .card{ grid-column: span 12; }
  .section-title{ align-items:flex-start; }
  .section-title .note{ text-align:left; }
  .course-layout{ grid-template-columns: 1fr; }
  .sidebar{ position:static; height:auto; }
  .two-col{ grid-template-columns:1fr; }
  .footer-grid{ grid-template-columns:1fr; }
  .social{ justify-content:flex-start; }
}
.field{
  width:100%;
  padding:10px 12px;
  border-radius: 14px;
  border:1px solid rgba(234,240,255,.12);
  background: rgba(15,27,46,.35);
  color: var(--text);
  outline:none;
}
.field::placeholder{ color: rgba(156,176,209,.75); }

textarea.field{
  min-height: 240px;
  font-family: var(--mono);
  line-height: 1.4;
  resize: vertical;
}

.kv{
  display:grid;
  grid-template-columns: 1fr 1fr;
  gap:10px;
}
@media (max-width:980px){
  .kv{ grid-template-columns:1fr; }
}

.codebox{
  font-family: var(--mono);
  font-size: 12px;
  padding:12px;
  border-radius: 14px;
  border:1px solid rgba(234,240,255,.10);
  background: rgba(11,18,32,.45);
  color: rgba(234,240,255,.92);
  white-space: pre-wrap;
}
/* ===== Progreso / completado ===== */
.nav-item.completed{
  border-color: rgba(54,245,197,.35);
  background: rgba(54,245,197,.10);
}
.nav-item.completed .d{ color: rgba(234,240,255,.78); }

.badge.ok{
  border-color: rgba(54,245,197,.35);
  background: rgba(54,245,197,.12);
}
.badge.todo{
  border-color: rgba(234,240,255,.12);
  background: rgba(15,27,46,.25);
  color: var(--muted);
}
.progress{
  height:10px;
  border-radius:999px;
  border:1px solid rgba(234,240,255,.10);
  background: rgba(15,27,46,.35);
  overflow:hidden;
}
.progress > div{
  height:100%;
  width:0%;
  background: linear-gradient(90deg, rgba(54,245,197,.85), rgba(106,166,255,.75));
}

/* ===== Campos extra (Evaluaciones) ===== */
.field{
  width:100%;
  padding:10px 12px;
  border-radius: 14px;
  border:1px solid rgba(234,240,255,.12);
  background: rgba(15,27,46,.35);
  color: var(--text);
  outline:none;
}
.field::placeholder{ color: rgba(156,176,209,.75); }

textarea.field{
  min-height: 220px;
  font-family: var(--mono);
  line-height: 1.4;
  resize: vertical;
}

.codebox{
  font-family: var(--mono);
  font-size: 12px;
  padding:12px;
  border-radius: 14px;
  border:1px solid rgba(234,240,255,.10);
  background: rgba(11,18,32,.45);
  color: rgba(234,240,255,.92);
  white-space: pre-wrap;
}
/* ===== Quiz interactivo ===== */
.quiz-wrap{ margin-top: 10px; }
.quiz-table{
  width:100%;
  border-collapse: collapse;
  border:1px solid rgba(234,240,255,.10);
  border-radius: 14px;
  overflow:hidden;
}
.quiz-table th,.quiz-table td{
  padding:12px;
  border-bottom:1px solid rgba(234,240,255,.10);
  vertical-align:top;
}
.quiz-table th{
  background: rgba(11,18,32,.45);
  font-size:12px;
  text-transform: uppercase;
  letter-spacing:.14px;
}
.quiz-table tr:last-child td{ border-bottom:none; }

.quiz-topic{
  display:inline-flex;
  margin-top:8px;
}

.opt-list{ display:flex; flex-direction:column; gap:8px; }
.opt-btn{
  text-align:left;
  padding:10px 12px;
  border-radius: 14px;
  border:1px solid rgba(234,240,255,.12);
  background: rgba(15,27,46,.35);
  color: rgba(234,240,255,.92);
  cursor:pointer;
  transition: border-color .15s ease, background .15s ease, transform .08s ease;
}
.opt-btn:hover{ border-color: rgba(106,166,255,.55); background: rgba(15,27,46,.55); }
.opt-btn:active{ transform: translateY(1px); }

.opt-btn.correct{
  border-color: rgba(54,245,197,.65);
  background: rgba(54,245,197,.12);
}
.opt-btn.wrong{
  border-color: rgba(255,77,109,.65);
  background: rgba(255,77,109,.12);
}

.feedback{
  padding:10px 12px;
  border-radius: 14px;
  border:1px solid rgba(234,240,255,.10);
  background: rgba(11,18,32,.35);
  color: rgba(234,240,255,.90);
  min-height: 46px;
}
.feedback.ok{
  border-color: rgba(54,245,197,.35);
}
.feedback.bad{
  border-color: rgba(255,77,109,.35);
}
.feedback .note{
  margin-top:6px;
  display:block;
}
/* ====== Día de clase: contenido del día (sin agenda 6h) ====== */
.day-syllabus{
  display:grid;
  gap:14px;
}

.day-syllabus-grid{
  display:grid;
  grid-template-columns: 1.1fr .9fr;
  gap:14px;
  align-items:start;
}

@media (max-width: 900px){
  .day-syllabus-grid{ grid-template-columns: 1fr; }
}

.day-card h3{
  margin: 0 0 8px 0;
}

.badge{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:6px 10px;
  border-radius:999px;
  background: rgba(255,255,255,.06);
  border: 1px solid rgba(255,255,255,.10);
  font-size: 13px;
}

.resource-list{
  display:grid;
  gap:8px;
  margin-top:10px;
}
.resource-item{
  display:flex;
  gap:10px;
  align-items:flex-start;
  padding:10px 12px;
  border-radius:14px;
  background: rgba(0,0,0,.18);
  border: 1px solid rgba(255,255,255,.08);
}
.resource-item .tag{
  font-size:12px;
  padding:4px 8px;
  border-radius:999px;
  background: rgba(0,255,180,.10);
  border: 1px solid rgba(0,255,180,.22);
  color: rgba(190,255,235,.95);
  white-space: nowrap;
}
.resource-item a{
  color: inherit;
  text-decoration: none;
}
.resource-item a:hover{
  text-decoration: underline;
}

.ul-tight{
  margin: 8px 0 0 18px;
}
.ul-tight li{ margin: 6px 0; }