/* ==========================================================================
   Cuantica Academy — sistema de diseno
   Tipografia editorial (serif display + sans) · paleta oscura premium
   ========================================================================== */
:root {
  --bg: #0a0e15;
  --bg-2: #0e131d;
  --panel: #121a26;
  --panel-2: #172130;
  --panel-3: #1d2938;
  --ink: #e9eef6;
  --ink-soft: #b7c1d1;
  --muted: #7d8aa0;
  --line: #23303f;
  --line-soft: #1a2432;

  --accent: #34d39a;      /* esmeralda */
  --accent-ink: #052018;
  --accent-2: #6ea0ff;    /* azul */
  --accent-3: #b98bff;    /* violeta */
  --gold: #cdb06a;

  --ok: #34d39a;
  --warn: #f0b35b;
  --err: #ff6b7d;

  --radius: 14px;
  --radius-sm: 9px;
  --shadow: 0 20px 60px rgba(0,0,0,.45);
  --maxw: 1120px;

  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, "Times New Roman", serif;
  --sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--sans);
  background:
    radial-gradient(1100px 520px at 82% -8%, rgba(52,211,154,.10) 0%, transparent 58%),
    radial-gradient(900px 480px at -8% 6%, rgba(110,160,255,.10) 0%, transparent 55%),
    var(--bg);
  color: var(--ink);
  line-height: 1.65;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
a:hover { color: #6ee7bd; }
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 22px; }
.page { padding: 34px 0 72px; }
.muted { color: var(--muted); }
.small { font-size: .85rem; }
.center { text-align: center; }
.mt { margin-top: 18px; } .mb { margin-bottom: 18px; } .mt-lg { margin-top: 34px; }

h1, h2, h3, h4, .serif { font-family: var(--serif); color: #fff; font-weight: 600; letter-spacing: .2px; line-height: 1.2; }
h1 { font-size: 2.3rem; margin: .1em 0 .35em; }
h2 { font-size: 1.7rem; margin: 1.4em 0 .5em; }
h3 { font-size: 1.28rem; margin: 1.5em 0 .4em; }
h4 { font-size: 1.02rem; }

/* -------------------------------------------------------------- Header */
.site-header {
  position: sticky; top: 0; z-index: 60;
  background: rgba(10,14,21,.82);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line-soft);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 66px; gap: 18px; }
.brand { display: flex; align-items: center; gap: 12px; color: #fff; }
.brand:hover { color: #fff; }
.brand svg { width: 34px; height: 34px; flex: none; }
.brand-name { font-family: var(--serif); font-weight: 600; font-size: 1.22rem; letter-spacing: .3px; }
.brand-name small { display: block; font-family: var(--sans); font-size: .62rem; letter-spacing: 3px; text-transform: uppercase; color: var(--muted); margin-top: -2px; }
.main-nav { display: flex; align-items: center; gap: 20px; }
.main-nav a { color: var(--ink-soft); font-weight: 500; font-size: .93rem; }
.main-nav a:hover { color: #fff; }
.nav-admin { color: var(--accent-3) !important; }
.nav-user { color: var(--ink); font-weight: 600; font-size: .9rem; }
.inline { display: inline; }

/* -------------------------------------------------------------- Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px; cursor: pointer;
  border: 1px solid transparent; border-radius: 10px; padding: 11px 20px;
  font-family: var(--sans); font-weight: 600; font-size: .93rem; color: #fff; background: var(--panel-3);
  transition: transform .06s ease, filter .16s ease, background .16s ease; text-align: center;
}
.btn:hover { filter: brightness(1.08); color: #fff; }
.btn:active { transform: translateY(1px); }
.btn-primary { background: linear-gradient(135deg, #10a86f, #0a7d52); color: #fff !important; border: 1px solid rgba(255,255,255,.10); box-shadow: 0 6px 18px rgba(10,125,82,.45); font-weight: 700; text-shadow: 0 1px 1px rgba(0,0,0,.25); }
.btn-primary:hover { color: #fff !important; filter: brightness(1.1); box-shadow: 0 8px 24px rgba(10,125,82,.55); }
.btn-accent { background: linear-gradient(135deg, var(--accent-2), #4d78e6); }
.btn-ghost { background: transparent; border-color: var(--line); color: var(--ink); }
.btn-danger { background: linear-gradient(135deg, #ff5b6e, #c9283b); }
.btn-sm { padding: 7px 13px; font-size: .82rem; border-radius: 8px; }
.btn-block { display: flex; width: 100%; }
.btn[disabled] { opacity: .5; cursor: not-allowed; }

/* -------------------------------------------------------------- Cards / grid */
.card { background: linear-gradient(180deg, var(--panel), var(--bg-2)); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; box-shadow: var(--shadow); }
.card-flat { background: var(--panel); box-shadow: none; }
.grid { display: grid; gap: 18px; }
.grid-2 { grid-template-columns: 1fr 1fr; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.flex { display: flex; gap: 14px; align-items: center; flex-wrap: wrap; }
.spacer { flex: 1; }
@media (max-width: 860px){ .grid-2,.grid-3,.grid-4 { grid-template-columns: 1fr; } .main-nav{ gap: 12px; } .brand-name small { display:none; } }

/* -------------------------------------------------------------- Flash */
.flash { margin: 16px 0; padding: 12px 16px; border-radius: 10px; border: 1px solid var(--line); font-size: .93rem; }
.flash-success { background: rgba(52,211,154,.1); border-color: rgba(52,211,154,.4); }
.flash-error { background: rgba(255,107,125,.1); border-color: rgba(255,107,125,.4); }
.flash-info { background: rgba(110,160,255,.1); border-color: rgba(110,160,255,.4); }

/* -------------------------------------------------------------- Hero */
.hero { padding: 60px 0 30px; }
.eyebrow { text-transform: uppercase; letter-spacing: 4px; font-size: .72rem; color: var(--accent); font-weight: 700; }
.hero h1 { font-size: 3rem; max-width: 17ch; margin-top: 12px; }
.hero .lead { font-size: 1.18rem; color: var(--ink-soft); max-width: 62ch; }
.hero-badges { display: flex; gap: 10px; flex-wrap: wrap; margin: 20px 0; }
.badge { background: var(--panel-2); border: 1px solid var(--line); padding: 6px 13px; border-radius: 999px; font-size: .8rem; color: var(--ink-soft); }
.hero-cta { display: flex; gap: 14px; margin-top: 24px; flex-wrap: wrap; align-items: center; }
.price-tag b { color: var(--accent); font-family: var(--serif); font-size: 1.3rem; }

/* Hero a dos columnas con visual */
.hero-grid { display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 40px; align-items: center; position: relative; }
.hero-grid::before { content: ""; position: absolute; right: -6%; top: -20%; width: 520px; height: 520px; border-radius: 50%;
  background: radial-gradient(circle, rgba(52,211,154,.20), rgba(110,160,255,.10) 45%, transparent 70%); filter: blur(10px); z-index: -1; pointer-events: none; }
.hero-visual { position: relative; display: grid; place-items: center; min-height: 360px; }
.hero-card { position: relative; width: 100%; max-width: 380px; background: linear-gradient(180deg, var(--panel), var(--bg-2)); border: 1px solid var(--line); border-radius: 20px; padding: 30px; box-shadow: var(--shadow); text-align: center; }
.hero-atom { width: 190px; height: 190px; margin: 0 auto; }
.hero-atom .orbit { transform-origin: 95px 95px; }
.hero-atom .orbit-1 { animation: spin 7s linear infinite; }
.hero-atom .orbit-2 { animation: spin 9s linear infinite reverse; }
.hero-atom .orbit-3 { animation: spin 11s linear infinite; }
.hero-atom .nucleus { animation: pulse 2.2s ease-in-out infinite; transform-origin: 95px 95px; }
.hero-chip { position: absolute; background: var(--panel-2); border: 1px solid var(--line); color: var(--ink-soft); font-size: .72rem; font-family: ui-monospace, Consolas, monospace; padding: 6px 11px; border-radius: 999px; box-shadow: var(--shadow); }
.hero-chip.c1 { top: 8%; left: -6%; color: #7ff0c4; }
.hero-chip.c2 { bottom: 14%; right: -8%; color: #b9ccff; }
.hero-chip.c3 { bottom: -4%; left: 12%; color: #dcc7ff; }
.hero-card .cap { margin-top: 14px; color: var(--muted); font-size: .82rem; letter-spacing: 2px; text-transform: uppercase; }

/* Banda de datos */
.stats-band { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: 14px; overflow: hidden; margin: 30px 0; }
.stats-band > div { background: var(--panel); padding: 20px; text-align: center; }
.stats-band .n { font-family: var(--serif); font-size: 1.9rem; color: var(--accent); }
.stats-band .l { color: var(--muted); font-size: .78rem; text-transform: uppercase; letter-spacing: 1.2px; margin-top: 2px; }

/* Tarjetas de caracteristica con icono */
.feat { transition: transform .12s ease, border-color .15s ease; }
.feat:hover { transform: translateY(-3px); border-color: var(--accent); }
.feat .ic { width: 46px; height: 46px; border-radius: 12px; display: grid; place-items: center; margin-bottom: 12px;
  background: linear-gradient(135deg, rgba(52,211,154,.18), rgba(110,160,255,.14)); border: 1px solid var(--line); }
.feat .ic svg { width: 24px; height: 24px; }
.section-head { text-align: center; max-width: 60ch; margin: 0 auto 8px; }
@media (max-width: 860px){ .hero-grid { grid-template-columns: 1fr; } .hero-visual { min-height: 280px; margin-top: 10px; } .stats-band { grid-template-columns: 1fr 1fr; } }

/* -------------------------------------------------------------- Tracks / modules */
.track-label { text-transform: uppercase; letter-spacing: 2px; font-size: .68rem; font-weight: 700; color: var(--accent-2); }
.module { margin-bottom: 16px; }
.module-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 14px; }
.module-head h3 { margin: 4px 0 2px; }
.module-sub { color: var(--muted); font-size: .9rem; }
.module-index { font-family: var(--serif); font-size: 2rem; color: var(--line); line-height: 1; }
.lesson-row { display: flex; align-items: center; gap: 14px; padding: 13px 15px; border-radius: 10px; border: 1px solid var(--line-soft); background: var(--panel); margin-top: 8px; transition: border-color .15s; }
.lesson-row:hover { border-color: var(--line); }
.lesson-row .num { width: 30px; height: 30px; border-radius: 8px; background: var(--panel-3); display: grid; place-items: center; font-weight: 700; color: var(--ink-soft); flex: none; font-size: .85rem; }
.lesson-row .num.done { background: rgba(52,211,154,.16); color: var(--accent); }
.lesson-row .title { flex: 1; font-weight: 500; }
.lesson-row .meta { color: var(--muted); font-size: .8rem; }
.pill { font-size: .68rem; padding: 3px 10px; border-radius: 999px; font-weight: 700; letter-spacing: .3px; text-transform: uppercase; }
.pill-free { background: rgba(52,211,154,.16); color: #7ff0c4; }
.pill-lock { background: rgba(240,179,91,.14); color: #f4cf9b; }
.pill-done { background: rgba(110,160,255,.18); color: #b9ccff; }
.pill-exam { background: rgba(185,139,255,.16); color: #dcc7ff; }
.pill-ctf { background: rgba(255,107,125,.14); color: #ffb3bc; }

/* -------------------------------------------------------------- Progress */
.progress { height: 9px; background: var(--panel-3); border-radius: 999px; overflow: hidden; }
.progress > span { display: block; height: 100%; background: linear-gradient(90deg, var(--accent), var(--accent-2)); }

/* -------------------------------------------------------------- Forms */
.form-field { margin-bottom: 15px; }
label { display: block; font-weight: 600; margin-bottom: 6px; color: var(--ink-soft); font-size: .9rem; }
input[type=text], input[type=email], input[type=password], input[type=number], input[type=date], select, textarea {
  width: 100%; padding: 11px 13px; border-radius: 10px; border: 1px solid var(--line);
  background: #0b1220; color: var(--ink); font-size: 1rem; font-family: var(--sans);
}
textarea { min-height: 140px; resize: vertical; }
input:focus, select:focus, textarea:focus { outline: 2px solid var(--accent); border-color: var(--accent); }
.form-narrow { max-width: 440px; margin: 0 auto; }
.errors { background: rgba(255,107,125,.1); border: 1px solid rgba(255,107,125,.4); border-radius: 10px; padding: 10px 16px; margin-bottom: 15px; }
.errors li { color: #ffc2ca; }

/* -------------------------------------------------------------- Lesson content */
.lesson-hero { border-bottom: 1px solid var(--line-soft); padding-bottom: 18px; margin-bottom: 8px; }
.lesson-content { font-size: 1.07rem; color: var(--ink); }
.lesson-content > p:first-of-type, .lesson-content p.lead { font-size: 1.18rem; color: var(--ink-soft); }
.lesson-content h2 { padding-left: 14px; border-left: 3px solid var(--accent); }
.lesson-content h3 { color: var(--accent-2); font-family: var(--serif); }
.lesson-content p { margin: 0 0 1.05em; }
.lesson-content strong { color: #fff; }
.lesson-content code { background: #0b1220; border: 1px solid var(--line); padding: 1px 6px; border-radius: 6px; font-size: .9em; font-family: ui-monospace, "Cascadia Code", Consolas, monospace; color: #a9e6cf; }
.lesson-content ul, .lesson-content ol { padding-left: 1.4em; }
.lesson-content li { margin: .3em 0; }
.deflist dt { font-weight: 700; color: #fff; margin-top: .6em; }
.deflist dd { margin: 0 0 .4em; color: var(--ink-soft); }
blockquote { border-left: 3px solid var(--accent-3); margin: 1.3em 0; padding: 6px 18px; color: var(--ink-soft); font-style: italic; }
blockquote cite { display: block; margin-top: 6px; color: var(--muted); font-style: normal; font-size: .86em; }
.epigraph { font-size: 1.12rem; }

/* Callouts */
.callout { border-radius: 12px; padding: 16px 18px 4px; margin: 1.5em 0; border: 1px solid var(--line); border-left-width: 4px; background: var(--panel); }
.callout h4 { margin: 0 0 8px; font-family: var(--sans); text-transform: uppercase; letter-spacing: 1.5px; font-size: .74rem; font-weight: 800; color: var(--ink-soft); }
.callout p, .callout ul, .callout ol { font-size: .98rem; }
.callout-key { border-left-color: var(--accent); background: rgba(52,211,154,.06); }
.callout-key h4 { color: var(--accent); }
.callout-analogy { border-left-color: var(--accent-2); background: rgba(110,160,255,.06); }
.callout-analogy h4 { color: var(--accent-2); }
.callout-example { border-left-color: #8ea2c0; }
.callout-warning { border-left-color: var(--warn); background: rgba(240,179,91,.06); }
.callout-warning h4 { color: var(--warn); }
.callout-history { border-left-color: var(--gold); }
.callout-history h4 { color: var(--gold); }
.callout-tech { border-left-color: var(--accent-3); background: rgba(185,139,255,.05); }
.callout-tech h4 { color: var(--accent-3); }
.callout-business { border-left-color: var(--accent); background: rgba(52,211,154,.05); }
.callout-business h4 { color: var(--accent); }
.callout-summary { border-left-color: var(--accent-3); background: rgba(185,139,255,.07); }
.callout-summary h4 { color: var(--accent-3); }

/* Tables */
.table-wrap { overflow-x: auto; margin: 1.2em 0; }
.lesson-content table { width: 100%; border-collapse: collapse; }
.lesson-content th, .lesson-content td { border: 1px solid var(--line); padding: 9px 12px; text-align: left; font-size: .95rem; }
.lesson-content th { background: var(--panel-3); color: #fff; font-family: var(--sans); }

/* Diagrams (SVG) */
.diagram { margin: 1.6em 0; text-align: center; background: var(--bg-2); border: 1px solid var(--line-soft); border-radius: 12px; padding: 18px; }
.diagram svg { max-width: 100%; height: auto; }
.diagram figcaption { color: var(--muted); font-size: .87rem; margin-top: 10px; }

/* Exercises & challenges */
.exercise { border: 1px solid var(--line); border-left: 4px solid var(--accent-2); border-radius: 12px; padding: 16px 18px; margin: 1.5em 0; background: var(--panel); }
.exercise h4 { font-family: var(--sans); font-size: .78rem; text-transform: uppercase; letter-spacing: 1.5px; color: var(--accent-2); margin: 0 0 8px; }
.exercise .solution { margin-top: 10px; }
.exercise summary { cursor: pointer; color: var(--accent); font-weight: 600; font-size: .9rem; }
.exercise summary:hover { color: #6ee7bd; }
.exercise .solution > div { margin-top: 10px; padding-top: 10px; border-top: 1px dashed var(--line); }
.challenge { border: 1px solid rgba(52,211,154,.35); border-radius: 12px; padding: 16px 18px; margin: 1.5em 0; background: linear-gradient(135deg, rgba(52,211,154,.08), rgba(110,160,255,.05)); }
.challenge h4 { font-family: var(--sans); font-size: .78rem; text-transform: uppercase; letter-spacing: 1.5px; color: var(--accent); margin: 0 0 8px; }

/* Lesson nav */
.lesson-nav { display: flex; justify-content: space-between; gap: 12px; margin-top: 34px; }
.lesson-nav .btn { max-width: 48%; }

/* -------------------------------------------------------------- Quiz */
.question { border: 1px solid var(--line); border-radius: 12px; padding: 18px 20px; margin-bottom: 14px; background: var(--panel); }
.question .q-prompt { font-weight: 600; margin-bottom: 12px; font-size: 1.03rem; }
.option { display: flex; align-items: flex-start; gap: 10px; padding: 11px 13px; border: 1px solid var(--line); border-radius: 9px; margin-bottom: 8px; cursor: pointer; transition: border-color .12s, background .12s; }
.option:hover { border-color: var(--accent); }
.option.selected { border-color: var(--accent); background: rgba(52,211,154,.08); }
.option input { margin-top: 3px; }
.option.correct { border-color: var(--ok); background: rgba(52,211,154,.12); }
.option.wrong { border-color: var(--err); background: rgba(255,107,125,.12); }
.result-head { text-align: center; padding: 26px; }
.score-big { font-size: 3.2rem; font-weight: 700; font-family: var(--serif); }
.explain { margin-top: 8px; color: var(--ink-soft); font-size: .9rem; border-top: 1px dashed var(--line); padding-top: 8px; }

/* CTF */
.ctf-flag { border: 1px solid var(--line); border-radius: 12px; padding: 16px 18px; margin-bottom: 14px; background: var(--panel); }
.ctf-flag.solved { border-color: var(--ok); background: rgba(52,211,154,.08); }
.ctf-flag .points { float: right; color: var(--accent); font-weight: 700; font-family: var(--serif); }
.ctf-flag .hint { color: var(--muted); font-size: .86rem; margin-top: 6px; }
.mono { font-family: ui-monospace, "Cascadia Code", Consolas, monospace; }
.scoreboard { font-family: var(--serif); font-size: 1.4rem; color: var(--accent); }

/* -------------------------------------------------------------- Stats */
.stat { text-align: center; padding: 20px; }
.stat .num { font-size: 2.1rem; font-weight: 600; color: #fff; font-family: var(--serif); }
.stat .num.accent { color: var(--accent); }
.stat .lbl { color: var(--muted); font-size: .74rem; text-transform: uppercase; letter-spacing: 1.5px; margin-top: 4px; }

/* -------------------------------------------------------------- Tables (data) */
table.data { width: 100%; border-collapse: collapse; }
table.data th, table.data td { padding: 11px 13px; border-bottom: 1px solid var(--line-soft); text-align: left; font-size: .9rem; }
table.data th { color: var(--muted); font-family: var(--sans); font-weight: 600; text-transform: uppercase; letter-spacing: .5px; font-size: .74rem; }
table.data tr:hover td { background: var(--panel); }
.tag { font-size: .7rem; padding: 2px 9px; border-radius: 6px; font-weight: 700; text-transform: uppercase; letter-spacing: .4px; }
.tag-ok { background: rgba(52,211,154,.16); color: #7ff0c4; }
.tag-no { background: rgba(125,138,160,.18); color: #b3bcda; }
.tag-admin { background: rgba(185,139,255,.2); color: #dcc7ff; }
.tag-susp { background: rgba(255,107,125,.18); color: #ffb3bc; }

/* -------------------------------------------------------------- Footer */
.site-footer { border-top: 1px solid var(--line-soft); margin-top: 60px; }
.footer-inner { display: flex; justify-content: space-between; gap: 24px; padding: 34px 0; flex-wrap: wrap; }
.footer-links { display: flex; gap: 18px; flex-wrap: wrap; }
.footer-links a { color: var(--ink-soft); }

/* -------------------------------------------------------------- Certificate */
body.clean { background: var(--bg); display: grid; place-items: center; min-height: 100vh; padding: 24px; }
.certificate { width: 920px; max-width: 100%; background: #fbfaf5; color: #1a2340; border-radius: 6px; padding: 56px 62px; box-shadow: var(--shadow); border: 12px solid #15202f; position: relative; font-family: var(--serif); }
.certificate::after { content: ""; position: absolute; inset: 16px; border: 2px solid var(--gold); border-radius: 3px; pointer-events: none; }
.cert-org { text-transform: uppercase; letter-spacing: 5px; color: #6c7aa8; font-weight: 700; text-align: center; font-family: var(--sans); font-size: .8rem; }
.cert-title { text-align: center; font-size: 2.5rem; margin: 10px 0; color: #12204a; }
.cert-name { text-align: center; font-size: 2.2rem; font-weight: 700; color: #15202f; border-bottom: 2px solid var(--gold); display: inline-block; padding: 0 22px 6px; margin: 12px auto; }
.cert-center { text-align: center; }
.cert-body { text-align: center; color: #33406b; max-width: 62ch; margin: 14px auto; font-family: var(--sans); }
.cert-meta { display: flex; justify-content: space-between; margin-top: 46px; font-family: var(--sans); }
.cert-meta .sig { text-align: center; }
.cert-meta .line { border-top: 1.5px solid #15202f; width: 220px; margin: 0 auto 4px; }
.print-bar { margin: 18px 0; text-align: center; }
@media print { .print-bar, .site-header, .site-footer, #app-loader { display: none !important; } body.clean { background: #fff; } .certificate { box-shadow: none; } }

/* -------------------------------------------------------------- Admin */
.admin-nav { display: flex; gap: 8px; flex-wrap: wrap; margin: 18px 0 24px; border-bottom: 1px solid var(--line-soft); padding-bottom: 14px; }
.admin-nav a { padding: 8px 15px; border-radius: 9px; color: var(--ink-soft); font-weight: 600; font-size: .9rem; }
.admin-nav a.active { background: linear-gradient(135deg, var(--accent), #1fb37e); color: var(--accent-ink); }
.admin-nav a:hover:not(.active) { background: var(--panel-3); color: #fff; }
hr.sep { border: none; border-top: 1px solid var(--line); margin: 22px 0; }
.kv { display: grid; grid-template-columns: 170px 1fr; gap: 7px 14px; }
.kv dt { color: var(--muted); }
.row-actions { display: flex; gap: 8px; flex-wrap: wrap; }
.bar-chart { display: flex; align-items: flex-end; gap: 6px; height: 140px; padding-top: 10px; }
.bar-chart .bar { flex: 1; background: linear-gradient(180deg, var(--accent), #1fb37e); border-radius: 4px 4px 0 0; min-height: 2px; position: relative; }
.bar-chart .bar span { position: absolute; top: -18px; left: 0; right: 0; text-align: center; font-size: .68rem; color: var(--ink-soft); }
.bar-axis { display: flex; gap: 6px; margin-top: 6px; }
.bar-axis div { flex: 1; text-align: center; font-size: .62rem; color: var(--muted); }

/* -------------------------------------------------------------- Avatares y perfil */
.avatar-lg { width: 84px; height: 84px; border-radius: 20px; border: 2px solid var(--line); background: var(--panel); }
.avatar-sm { width: 30px; height: 30px; border-radius: 8px; vertical-align: middle; margin-right: 8px; }
.avatar-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(56px, 1fr)); gap: 10px; margin-top: 10px; max-height: 360px; overflow-y: auto; padding: 6px; border: 1px solid var(--line-soft); border-radius: 12px; background: var(--bg-2); }
.avatar-pick { cursor: pointer; position: relative; }
.avatar-pick input { position: absolute; opacity: 0; }
.avatar-pick img { width: 100%; border-radius: 12px; border: 2px solid transparent; transition: border-color .12s, transform .08s; display: block; }
.avatar-pick:hover img { transform: scale(1.05); }
.avatar-pick input:checked + img { border-color: var(--accent); box-shadow: 0 0 0 2px rgba(52,211,154,.4); }
.switch { display: flex; align-items: center; gap: 10px; cursor: pointer; margin-top: 8px; font-weight: 500; color: var(--ink); }
.switch input { width: 18px; height: 18px; accent-color: var(--accent); }

/* -------------------------------------------------------------- CTF */
.ctf-card { position: relative; transition: transform .08s, border-color .15s; }
.ctf-card:hover { transform: translateY(-2px); border-color: var(--accent); }
.ctf-card.solved { border-color: rgba(52,211,154,.5); }
.ctf-card.solved::after { content: "RESUELTO"; position: absolute; top: 12px; right: 14px; font-size: .6rem; font-weight: 800; letter-spacing: 1px; color: var(--accent); }
.ctf-card.locked { opacity: .6; }
.ctf-pts { font-family: var(--serif); font-size: 1.3rem; color: var(--accent); }
.pill-cat { background: rgba(110,160,255,.16); color: #b9ccff; }
.me-row td { background: rgba(52,211,154,.08) !important; font-weight: 600; }

/* -------------------------------------------------------------- Codigo */
.lesson-content pre.code, pre.code {
  background: #070c15; border: 1px solid var(--line); border-left: 3px solid var(--accent-2);
  border-radius: 10px; padding: 14px 16px; overflow-x: auto; margin: 1.2em 0; font-size: .92rem; line-height: 1.55;
}
pre.code code { background: none; border: none; padding: 0; color: #cdd7e6; font-family: ui-monospace, "Cascadia Code", Consolas, monospace; }
.code-caption { color: var(--muted); font-size: .82rem; margin: -0.6em 0 1.2em; }
.t-kw { color: #7aa2ff; } .t-str { color: #8ee6b6; } .t-com { color: #6b7791; font-style: italic; }
.t-num { color: #f0b35b; } .t-bi { color: #b98bff; } .t-dec { color: #f0b35b; }
.codelab { border: 1px solid var(--line); border-left: 4px solid var(--accent); border-radius: 12px; padding: 4px 20px 16px; margin: 1.8em 0; background: linear-gradient(180deg, rgba(52,211,154,.05), transparent); }
.codelab > h3, .codelab > h4 { color: var(--accent); }
.code-exercise { border: 1px dashed var(--line); border-radius: 10px; padding: 12px 16px; margin: 1.2em 0; background: var(--panel); }
.code-exercise h4 { font-family: var(--sans); font-size: .76rem; text-transform: uppercase; letter-spacing: 1.5px; color: var(--accent-2); margin: 0 0 8px; }

/* -------------------------------------------------------------- Simulador cuantico */
.qsim { border: 1px solid var(--line); border-radius: 12px; background: var(--bg-2); padding: 16px 18px; margin: 1.6em 0; }
.qsim-head { display: flex; flex-direction: column; gap: 2px; margin-bottom: 12px; }
.qsim-head strong { color: var(--accent-2); }
.qsim-grid { display: grid; grid-template-columns: 90px 1fr; gap: 12px; align-items: start; }
.qsim-in { width: 100%; background: #070c15; color: #cdd7e6; border: 1px solid var(--line); border-radius: 8px; padding: 10px; }
.qsim-actions { display: flex; align-items: center; gap: 12px; margin: 12px 0; }
.qsim-table { width: 100%; border-collapse: collapse; margin-top: 6px; }
.qsim-table th, .qsim-table td { padding: 6px 10px; border-bottom: 1px solid var(--line-soft); text-align: left; font-size: .9rem; }
.qsim-table th { color: var(--muted); font-size: .72rem; text-transform: uppercase; letter-spacing: 1px; }
.qsim-bar { background: var(--panel-3); border-radius: 999px; height: 8px; width: 160px; overflow: hidden; }
.qsim-bar > span { display: block; height: 100%; background: linear-gradient(90deg, var(--accent), var(--accent-2)); }
.qsim-out.err, .qsim-result .err { color: var(--warn); padding: 10px 0; }
@media (max-width: 640px){ .qsim-grid { grid-template-columns: 1fr; } }

/* -------------------------------------------------------------- Loader (atomo animado) */
#app-loader {
  position: fixed; inset: 0; z-index: 9999; display: grid; place-items: center;
  background: radial-gradient(600px 400px at 50% 40%, #0e1520 0%, #070a10 100%);
  transition: opacity .45s ease, visibility .45s ease;
}
#app-loader.hidden { opacity: 0; visibility: hidden; }
.atom-loader { text-align: center; }
.atom { width: 128px; height: 128px; margin: 0 auto; }
.atom .orbit { transform-origin: 64px 64px; }
.atom .orbit-1 { animation: spin 2.6s linear infinite; }
.atom .orbit-2 { animation: spin 2.6s linear infinite reverse; }
.atom .orbit-3 { animation: spin 3.4s linear infinite; }
.atom .nucleus { animation: pulse 1.6s ease-in-out infinite; transform-origin: 64px 64px; }
@keyframes spin { to { transform: rotate(360deg); } }
@keyframes pulse { 0%,100% { opacity: .85; } 50% { opacity: 1; } }
.loader-title { margin-top: 22px; font-family: var(--serif); font-size: 1.25rem; color: #fff; letter-spacing: .5px; }
.loader-sub { color: var(--muted); font-size: .82rem; letter-spacing: 3px; text-transform: uppercase; margin-top: 4px; }
@media (prefers-reduced-motion: reduce) { .atom .orbit, .atom .nucleus { animation: none; } }