:root{
    --bg:#f6f7fb; --surface:#ffffff; --ink:#0f172a; --muted:#5b6478; --line:#e3e7ef;
    --brand:#4f46e5; --brand-2:#06b6d4; --accent:#f59e0b; --ok:#10b981; --bad:#ef4444;
    --radius:18px; --shadow:0 10px 30px rgba(15,23,42,.08);
    --max:1180px;
  }
  *{box-sizing:border-box;margin:0;padding:0}
  html{scroll-behavior:smooth}
  body{font-family:Inter,system-ui,sans-serif;background:var(--bg);color:var(--ink);line-height:1.6}
  h1,h2,h3{font-family:Poppins,system-ui,sans-serif;line-height:1.2}
  a{color:inherit}
  img,svg{display:block;max-width:100%}
  .container{width:min(var(--max),100% - 32px);margin-inline:auto}
  .sprite{position:absolute;width:0;height:0;overflow:hidden}

  /* ========== HEADER ========== */
  .header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.9);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
  .header .container{display:flex;align-items:center;justify-content:space-between;height:68px}
  .logo{display:flex;align-items:center;gap:10px;font-family:Poppins;font-weight:800;font-size:1.15rem;text-decoration:none}
  .logo span{color:var(--brand)}
  .nav ul{display:flex;gap:2px;list-style:none}
  .nav a{display:block;padding:8px 11px;white-space:nowrap;font-size:.94rem;border-radius:999px;text-decoration:none;font-weight:500;color:var(--muted);transition:.2s}
  .nav a:hover,.nav a.active{background:#eef0ff;color:var(--brand)}
  .burger{display:none;background:none;border:0;cursor:pointer;padding:8px}
  .burger span{display:block;width:24px;height:2px;background:var(--ink);margin:5px 0;transition:.3s}
  @media (max-width:1240px){
    .burger{display:block}
    .nav{position:absolute;top:68px;left:0;right:0;background:#fff;border-bottom:1px solid var(--line);max-height:0;overflow:hidden;transition:max-height .35s}
    .nav.open{max-height:700px}
    .nav ul{flex-direction:column;padding:10px 16px 16px}
    .burger.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
    .burger.open span:nth-child(2){opacity:0}
    .burger.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
  }


  /* barra institucional */
  .inst{background:#fff;border-bottom:1px solid var(--line)}
  .inst .container{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:10px 0}
  .inst-logos{display:flex;align-items:center;gap:18px}
  .inst-logos img{height:64px;width:auto}
  .inst-logos .sep{width:1px;height:48px;background:var(--line)}
  .inst-txt{text-align:right;line-height:1.15}
  .inst-txt small{display:block;text-transform:uppercase;letter-spacing:.12em;font-size:.72rem;color:var(--muted);font-weight:600}
  .inst-txt strong{font-family:Poppins,sans-serif;font-size:clamp(1.1rem,2.6vw,1.6rem);color:var(--brand)}
  @media (max-width:520px){.inst-logos img{height:46px}.inst-logos{gap:10px}.inst-logos .sep{height:36px}}

  /* ========== SLIDER ========== */
  .slider{position:relative;overflow:hidden;background:linear-gradient(135deg,#1e1b4b,#312e81 45%,#0e7490);color:#fff}
  .slides{display:flex;transition:transform .7s cubic-bezier(.65,0,.35,1)}
  .slide{min-width:100%;padding:56px 0 76px}
  .slide .container{display:grid;grid-template-columns:1.05fr 1fr;gap:40px;align-items:center}
  .slide .tag{display:inline-block;padding:4px 12px;border-radius:999px;background:rgba(255,255,255,.14);font-size:.8rem;letter-spacing:.06em;text-transform:uppercase;margin-bottom:14px}
  .slide h1,.slide h2{font-size:clamp(1.7rem,4vw,2.9rem);margin-bottom:14px}
  .slide p{color:#dbe2ff;font-size:1.05rem;max-width:52ch}
  .slide .btn{display:inline-block;margin-top:22px;padding:12px 22px;border-radius:999px;background:var(--accent);color:#1e1b4b;font-weight:600;text-decoration:none}
  .slide .container{padding-inline:56px}
  .slide svg{width:100%;height:auto;filter:drop-shadow(0 20px 40px rgba(0,0,0,.35))}
  .s-arrow{position:absolute;top:50%;transform:translateY(-50%);width:46px;height:46px;border-radius:50%;border:0;background:rgba(255,255,255,.15);color:#fff;font-size:1.4rem;cursor:pointer;transition:.2s}
  .s-arrow:hover{background:rgba(255,255,255,.3)}
  .s-prev{left:14px}.s-next{right:14px}
  .dots{position:absolute;bottom:24px;left:0;right:0;display:flex;justify-content:center;gap:10px}
  .dots button{width:11px;height:11px;border-radius:999px;border:0;background:rgba(255,255,255,.4);cursor:pointer;transition:.3s}
  .dots button.on{width:32px;background:var(--accent)}
  @media (max-width:860px){
    .slide .container{grid-template-columns:1fr;text-align:center}
    .slide p{margin-inline:auto}
    .slide svg{max-width:360px;margin:0 auto}
    .s-arrow{display:none}
    .slide .container{padding-inline:0}
  }


  /* slide con foto */
  .slide .photo{width:100%;height:auto;border-radius:18px;box-shadow:0 24px 50px rgba(0,0,0,.4)}
  .slide .btns{display:flex;gap:12px;flex-wrap:wrap}
  .slide .btn.ghost{background:transparent;color:#fff;border:2px solid rgba(255,255,255,.6)}
  .slide .btn.ghost:hover{background:rgba(255,255,255,.12)}
  @media (max-width:860px){.slide .btns{justify-content:center}}

  /* partes de una página */
  .partes{display:grid;grid-template-columns:1.1fr 1fr;gap:36px;align-items:center}
  .partes .wire{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:18px;box-shadow:var(--shadow)}
  .plist{list-style:none;display:grid;gap:12px}
  .plist li{display:grid;grid-template-columns:34px 1fr;gap:12px;align-items:start;background:#fff;border:1px solid var(--line);border-radius:14px;padding:12px 14px}
  .plist .n{width:34px;height:34px;border-radius:50%;display:grid;place-items:center;color:#fff;font-family:Poppins;font-weight:800}
  .plist b{font-family:Poppins}
  .plist p{color:var(--muted);font-size:.92rem}
  .more{display:inline-flex;align-items:center;gap:8px;margin-top:18px;padding:12px 20px;border-radius:999px;background:var(--brand);color:#fff;font-weight:600;text-decoration:none}
  .more:hover{background:#4338ca}
  @media (max-width:860px){.partes{grid-template-columns:1fr}}


  /* dominio y hosting */
  .analog{display:grid;grid-template-columns:1fr auto 1fr;gap:18px;align-items:stretch}
  .analog .pic svg{max-height:190px;width:auto;margin:0 auto}
  .analog .plus{align-self:center;font-family:Poppins,sans-serif;font-size:2rem;font-weight:800;color:var(--brand)}
  @media (max-width:760px){.analog{grid-template-columns:1fr}.analog .plus{justify-self:center}}
  .fail{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:14px;margin-top:18px}
  .fail div{background:#fff;border:1px dashed #fca5a5;border-radius:14px;padding:14px 16px;font-size:.93rem;color:var(--muted)}
  .fail b{color:var(--ink)}
  .sub-h{font-family:Poppins,sans-serif;font-size:1.3rem;margin:56px 0 18px;text-align:center}
  .flow{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;counter-reset:f}
  .flow .st{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:18px;text-align:center;position:relative;box-shadow:var(--shadow)}
  .flow .st svg{width:72px;height:72px;margin:0 auto 10px}
  .flow .st h4{font-family:Poppins,sans-serif;margin-bottom:4px}
  .flow .st p{font-size:.88rem;color:var(--muted)}
  .flow .st:not(:last-child)::after{content:"→";position:absolute;right:-14px;top:50%;transform:translateY(-50%);font-size:1.3rem;color:var(--brand);font-weight:800;z-index:1}
  @media (max-width:860px){.flow{grid-template-columns:1fr 1fr}.flow .st:nth-child(2)::after{content:"↓";right:auto;left:50%;top:auto;bottom:-22px;transform:translateX(-50%)}}
  @media (max-width:480px){.flow{grid-template-columns:1fr}.flow .st:not(:last-child)::after{content:"↓";right:auto;left:50%;top:auto;bottom:-22px;transform:translateX(-50%)}}
  .url{background:#0f172a;border-radius:var(--radius);padding:26px 18px;display:flex;flex-wrap:wrap;justify-content:center;gap:4px 2px;font-family:ui-monospace,Consolas,monospace;font-size:clamp(1rem,2.6vw,1.6rem)}
  .url span{display:flex;flex-direction:column;align-items:center;padding:4px 6px;border-radius:8px}
  .url span i{font-style:normal;font-family:Inter,sans-serif;font-size:.62rem;margin-top:8px;text-transform:uppercase;letter-spacing:.06em;color:#cbd5e1;white-space:nowrap}
  .url .u1{color:#94a3b8}.url .u2{color:#fbbf24}.url .u3{color:#fff;background:rgba(79,70,229,.35)}.url .u4{color:#34d399}.url .u5{color:#22d3ee}.url .u6{color:#f472b6}
  .tld{display:grid;gap:14px;grid-template-columns:repeat(auto-fill,minmax(210px,1fr))}
  .tld div{background:#fff;border:1px solid var(--line);border-radius:14px;padding:16px}
  .tld b{font-family:Poppins,sans-serif;display:block}
  .tld small{color:var(--muted);display:block;margin:4px 0 8px}
  .tld code{display:inline-block;background:#eef2ff;color:var(--brand);border-radius:6px;padding:1px 7px;margin:2px 2px 0 0;font-size:.82rem}

  /* ========== SECCIONES ========== */
  section.block{padding:72px 0}
  .head{text-align:center;max-width:720px;margin:0 auto 40px}
  .head .kicker{color:var(--brand);font-weight:600;text-transform:uppercase;letter-spacing:.08em;font-size:.82rem}
  .head h2{font-size:clamp(1.6rem,3.2vw,2.3rem);margin:6px 0 10px}
  .head p{color:var(--muted)}
  .grid{display:grid;gap:22px;grid-template-columns:repeat(auto-fill,minmax(260px,1fr))}
  .card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:transform .25s, box-shadow .25s;display:flex;flex-direction:column}
  .card:hover{transform:translateY(-6px);box-shadow:0 18px 40px rgba(79,70,229,.15)}
  .card .pic{background:linear-gradient(135deg,#eef2ff,#ecfeff);padding:18px}
  .card .body{padding:18px 20px 22px;flex:1}
  .card h3{font-size:1.12rem;margin-bottom:6px}
  .card p{color:var(--muted);font-size:.95rem}
  .card .ex{margin-top:12px;font-size:.82rem;color:var(--brand);font-weight:600}
  .alt{background:#fff;border-block:1px solid var(--line)}

  /* sitio vs página */
  .versus{display:grid;grid-template-columns:1fr 1fr;gap:26px}
  .versus .card .pic{padding:26px}
  @media (max-width:760px){.versus{grid-template-columns:1fr}}

  /* chips */
  .chips{display:grid;gap:14px;grid-template-columns:repeat(auto-fill,minmax(230px,1fr))}
  .chip{background:var(--surface);border:1px solid var(--line);border-left:5px solid var(--brand-2);border-radius:14px;padding:14px 16px}
  .chip b{display:block;font-family:Poppins}
  .chip small{color:var(--muted)}

  /* apps */
  .apps .card .pic{background:linear-gradient(135deg,#fff7ed,#eef2ff)}
  .pros{list-style:none;margin-top:10px;font-size:.9rem}
  .pros li{padding-left:22px;position:relative;margin:4px 0;color:var(--muted)}
  .pros li::before{position:absolute;left:0;font-weight:700}
  .pros .y::before{content:"✔";color:var(--ok)}
  .pros .n::before{content:"✖";color:var(--bad)}

  .table-wrap{overflow-x:auto;margin-top:40px;border-radius:var(--radius);box-shadow:var(--shadow)}
  table{width:100%;border-collapse:collapse;background:#fff;min-width:620px}
  th,td{padding:14px 16px;text-align:center;border-bottom:1px solid var(--line)}
  th{background:#1e1b4b;color:#fff;font-family:Poppins}
  td:first-child,th:first-child{text-align:left;font-weight:600}
  tr:nth-child(even) td{background:#f8f9ff}
  .note{margin-top:12px;font-size:.85rem;color:var(--muted)}

  /* pasos */
  .steps{display:grid;gap:20px;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));counter-reset:s}
  .step{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px;position:relative}
  .step::before{counter-increment:s;content:counter(s);position:absolute;top:-16px;left:20px;width:36px;height:36px;border-radius:50%;background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;display:grid;place-items:center;font-family:Poppins;font-weight:800}
  .step h3{margin:8px 0 6px;font-size:1.05rem}
  .step p{color:var(--muted);font-size:.93rem}

  /* ========== FOOTER ========== */
  footer{background:#0f172a;color:#cbd5e1;padding:56px 0 24px;margin-top:40px}
  .f-grid{display:grid;grid-template-columns:1.3fr 1fr 1.4fr;gap:34px}
  footer h4{color:#fff;font-family:Poppins;margin-bottom:12px}
  footer ul{list-style:none}
  footer li{margin:6px 0}
  footer a{color:#cbd5e1;text-decoration:none}
  footer a:hover{color:var(--brand-2)}
  .f-bottom{border-top:1px solid #1e293b;margin-top:36px;padding-top:18px;font-size:.85rem;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px}
  @media (max-width:760px){.f-grid{grid-template-columns:1fr}}

  .totop{position:fixed;right:18px;bottom:18px;width:46px;height:46px;border-radius:50%;border:0;background:var(--brand);color:#fff;font-size:1.3rem;cursor:pointer;opacity:0;pointer-events:none;transition:.3s;box-shadow:var(--shadow)}
  .totop.show{opacity:1;pointer-events:auto}

  .reveal{opacity:0;transform:translateY(24px);transition:.6s}
  .reveal.in{opacity:1;transform:none}
  @media (prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto}.reveal{opacity:1;transform:none}}

/* =====================================================
   INTERACTIVIDAD
   ===================================================== */
/* barra de progreso de lectura */
.progress{position:fixed;top:0;left:0;right:0;height:4px;z-index:100;background:transparent}
.progress span{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--brand),var(--brand-2),var(--accent))}

/* pausa del slider */
.s-pause{position:absolute;bottom:16px;right:18px;width:36px;height:36px;border-radius:50%;border:0;background:rgba(255,255,255,.15);color:#fff;cursor:pointer;font-size:.8rem}
.s-pause:hover{background:rgba(255,255,255,.3)}

/* filtros */
.filter{display:flex;flex-direction:column;align-items:center;gap:14px;margin-bottom:28px}
.chips-f{display:flex;flex-wrap:wrap;justify-content:center;gap:8px}
.chips-f button{border:1px solid var(--line);background:#fff;border-radius:999px;padding:8px 14px;font:500 .9rem Inter,sans-serif;cursor:pointer;transition:.2s}
.chips-f button:hover{border-color:var(--brand);color:var(--brand)}
.chips-f button.on{background:var(--brand);border-color:var(--brand);color:#fff}
#buscar{width:min(420px,100%);padding:11px 16px;border-radius:999px;border:1px solid var(--line);font:inherit;outline:none}
#buscar:focus{border-color:var(--brand);box-shadow:0 0 0 4px #e0e7ff}
.count{font-size:.85rem;color:var(--muted)}
.empty{text-align:center;color:var(--muted);padding:30px}
.card.hide{display:none}
.card.pop{animation:pop .35s ease}
@keyframes pop{from{transform:scale(.94);opacity:0}to{transform:none;opacity:1}}

/* simulación DNS */
.sim{display:flex;align-items:center;justify-content:center;gap:16px;flex-wrap:wrap;margin-bottom:22px}
.sim .more{margin-top:0}
.sim .more:disabled{opacity:.6;cursor:wait}
#dns-log{font-size:.92rem;color:var(--muted);min-height:1.5em}
.flow .st{transition:transform .35s, box-shadow .35s, border-color .35s, opacity .35s}
.flow.running .st{opacity:.45}
.flow .st.on{opacity:1;transform:translateY(-8px) scale(1.03);border-color:var(--brand);box-shadow:0 18px 40px rgba(79,70,229,.25)}
.flow .st.done{opacity:1;border-color:var(--ok)}

/* laboratorio URL */
.lab{margin-top:30px;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow)}
.lab h4{font-family:Poppins,sans-serif;font-size:1.15rem}
.lab>p{color:var(--muted);margin-bottom:12px}
.lab-in{display:flex;gap:10px;flex-wrap:wrap}
.lab-in input{flex:1;min-width:0;padding:12px 14px;border-radius:12px;border:1px solid var(--line);font:500 .95rem ui-monospace,Consolas,monospace;outline:none}
.lab-in input:focus{border-color:var(--brand);box-shadow:0 0 0 4px #e0e7ff}
.lab-in .more{margin-top:0}
.lab-ej{margin:10px 0 16px;font-size:.85rem;color:var(--muted)}
.lab-ej button{border:0;background:#eef2ff;color:var(--brand);border-radius:6px;padding:3px 9px;margin:3px;cursor:pointer;font:500 .82rem ui-monospace,monospace}
#url-out{min-height:90px}
#url-out span{animation:pop .3s ease both}
.url .u7{color:#fb923c}.url .u8{color:#a78bfa}.url .u9{color:#f87171}
.lab-sum{margin-top:12px;font-size:.95rem}
.lab-sum.err{color:var(--bad)}

/* tabla interactiva */
th{cursor:pointer;user-select:none}
th:hover{background:#312e81}
td.hl,th.hl{background:#fef3c7!important;color:#1e1b4b}
th.hl{background:var(--accent)!important}

/* asistente de apps */
.wizard{margin-top:36px;background:linear-gradient(135deg,#1e1b4b,#312e81);color:#fff;border-radius:var(--radius);padding:26px}
.wizard h3{font-size:1.25rem}
.wizard>p{color:#c7d2fe;margin:4px 0 16px}
.qs{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:10px}
.qs label{display:flex;gap:12px;align-items:center;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.15);border-radius:12px;padding:12px 14px;cursor:pointer;transition:.2s}
.qs label:hover{background:rgba(255,255,255,.14)}
.qs input{appearance:none;width:40px;height:22px;border-radius:999px;background:rgba(255,255,255,.3);position:relative;flex:none;cursor:pointer;transition:.2s}
.qs input::after{content:"";position:absolute;top:3px;left:3px;width:16px;height:16px;border-radius:50%;background:#fff;transition:.2s}
.qs input:checked{background:var(--accent)}
.qs input:checked::after{left:21px}
.qs input:focus-visible{outline:2px solid #fff;outline-offset:2px}
.rec{margin-top:18px;background:#fff;color:var(--ink);border-radius:14px;padding:18px 20px;display:flex;gap:16px;align-items:center}
.rec .ico{font-size:2.4rem}
.rec b{font-family:Poppins,sans-serif;font-size:1.2rem;color:var(--brand)}
.rec p{color:var(--muted);font-size:.93rem}

/* quiz */
.quiz{display:grid;gap:16px;grid-template-columns:repeat(auto-fit,minmax(320px,1fr))}
.qz{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow);transition:.3s}
.qz h4{font-family:Poppins,sans-serif;font-size:1rem;margin-bottom:10px}
.qz h4 small{color:var(--brand);margin-right:6px}
.qz label{display:flex;gap:10px;align-items:flex-start;padding:9px 12px;border:1px solid var(--line);border-radius:10px;margin:6px 0;cursor:pointer;font-size:.93rem;transition:.2s}
.qz label:hover{border-color:var(--brand);background:#f8f9ff}
.qz input{margin-top:4px;accent-color:var(--brand)}
.qz label.ok{border-color:var(--ok);background:#ecfdf5}
.qz label.no{border-color:var(--bad);background:#fef2f2}
.qz.right{border-color:var(--ok)}
.qz.wrong{border-color:var(--bad)}
.qz .why{display:none;margin-top:8px;font-size:.87rem;color:var(--muted);background:#f8fafc;border-radius:8px;padding:8px 10px}
.qz.checked .why{display:block}
.qz.missing{border-color:var(--accent);animation:shake .4s}
@keyframes shake{25%{transform:translateX(-5px)}75%{transform:translateX(5px)}}
.quiz-bar{display:flex;gap:12px;align-items:center;justify-content:center;flex-wrap:wrap;margin-top:24px}
.quiz-bar .more{margin-top:0;border:0;cursor:pointer;font:600 1rem Inter,sans-serif}
.ghost-d{background:#fff!important;color:var(--brand)!important;border:2px solid var(--brand)!important}
#q-score{font-family:Poppins,sans-serif;font-size:1.15rem;width:100%;text-align:center}
.more{border:0;cursor:pointer;font-family:Inter,sans-serif;font-size:1rem}