:root{
  --deep:#041C24;--petrol:#07303B;--petrol2:#0C4251;--teal:#1593AE;--cyan:#35C6E0;
  --paper:#F2F7F8;--white:#fff;--ink:#0C1F26;--muted:#4E6872;--line:#CFE0E5;--amber:#F5A524;
  --ok:#14805E;--warn:#B26B00;--bad:#B3261E;
  --fd:"Chakra Petch",system-ui,sans-serif;--fb:"IBM Plex Sans",system-ui,sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:var(--fb);background:var(--paper);color:var(--ink);line-height:1.6;-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{color:var(--teal)}
:focus-visible{outline:3px solid var(--amber);outline-offset:2px;border-radius:4px}
h1,h2,h3{font-family:var(--fd);line-height:1.15}
h1{font-size:clamp(1.7rem,3.5vw,2.4rem)}h2{font-size:1.5rem;margin-bottom:12px}h3{font-size:1.15rem}
.container{max-width:1060px;margin:0 auto;padding-inline:20px}
.muted{color:var(--muted)}.small{font-size:.88rem}
.page{padding-block:32px 60px}
.page h1{margin-bottom:6px}.lead{color:var(--muted);margin-bottom:24px}

/* Botones y formularios */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font-family:var(--fd);font-weight:600;font-size:1rem;padding:.7rem 1.2rem;border-radius:6px;border:2px solid transparent;cursor:pointer;text-decoration:none;background:var(--petrol);color:#fff;transition:background .15s}
.btn:hover{background:var(--petrol2)}
.btn-amber{background:var(--amber);color:var(--deep)}.btn-amber:hover{background:#ffb93d}
.btn-line{background:transparent;color:var(--petrol);border-color:var(--petrol)}.btn-line:hover{background:var(--petrol);color:#fff}
.btn-danger{background:var(--bad)}.btn-danger:hover{background:#8f1e18}
.btn-sm{padding:.4rem .8rem;font-size:.9rem}
form.stack{display:grid;gap:16px}
label{display:grid;gap:6px;font-weight:600;font-size:.93rem}
input,select,textarea{font:inherit;font-weight:400;padding:.7rem .85rem;border:1.5px solid var(--line);border-radius:6px;background:#fff;color:var(--ink);width:100%}
input:focus,select:focus,textarea:focus{border-color:var(--teal);outline:none;box-shadow:0 0 0 3px rgba(21,147,174,.25)}
textarea{min-height:110px;resize:vertical}
input[type=radio],input[type=checkbox]{width:auto}
.row2{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.hint{font-weight:400;font-size:.84rem;color:var(--muted)}
.card{background:#fff;border:1px solid var(--line);border-radius:10px;padding:22px}
.card+.card{margin-top:18px}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:18px}
.flash{padding:12px 16px;border-radius:8px;margin-bottom:20px;font-weight:500}
.flash-ok{background:#E0F3EC;color:#0b5f45;border:1px solid #a9dccb}
.flash-err{background:#FBE5E3;color:#8a1c16;border:1px solid #f0b8b3}
.badge{display:inline-block;font-size:.78rem;font-weight:600;padding:2px 10px;border-radius:99px;background:#E3EEF1;color:var(--petrol)}
.badge.ok{background:#E0F3EC;color:#0b5f45}.badge.warn{background:#FFF1D6;color:#8a5200}.badge.bad{background:#FBE5E3;color:#8a1c16}
.bar{height:10px;background:#DDE9EC;border-radius:99px;overflow:hidden}
.bar>i{display:block;height:100%;background:linear-gradient(90deg,var(--teal),var(--cyan))}

/* Aula */
.topbar{background:#fff;border-bottom:1px solid var(--line)}
.topbar-in{display:flex;align-items:center;justify-content:space-between;gap:16px;height:68px}
.brand img{height:42px;width:auto}
.topnav{display:flex;gap:20px;align-items:center}
.topnav a{font-family:var(--fd);font-weight:500;text-decoration:none;color:var(--petrol)}
.topnav a:hover,.topnav a.on{color:var(--teal)}
.foot{border-top:1px solid var(--line);padding:22px 0;color:var(--muted);font-size:.88rem;text-align:center}
.auth{max-width:520px;margin:20px auto 0}
.auth .card{padding:30px}
.course-card{display:flex;flex-direction:column;gap:14px}
.course-card h3{font-size:1.3rem}
.course-card .btns{display:flex;gap:10px;flex-wrap:wrap;margin-top:auto}
.lessons{list-style:none;display:grid;gap:10px}
.lesson{display:flex;gap:14px;align-items:center;background:#fff;border:1px solid var(--line);border-radius:10px;padding:14px 18px}
.lesson .num{flex:none;width:44px;height:48px;display:grid;place-items:center;background:var(--petrol);color:var(--cyan);font-family:var(--fd);font-weight:700;clip-path:polygon(50% 0,100% 25%,100% 75%,50% 100%,0 75%,0 25%)}
.lesson.done .num{background:var(--ok);color:#fff}
.lesson.locked{opacity:.6}.lesson.locked .num{background:#8aa3ab;color:#fff}
.lesson .t{flex:1}.lesson .t strong{display:block;font-family:var(--fd);font-size:1.05rem}
.video{position:relative;aspect-ratio:16/9;background:#000;border-radius:10px;overflow:hidden;margin-bottom:18px}
.video iframe,.video video{position:absolute;inset:0;width:100%;height:100%;border:0}
.content{white-space:pre-line;max-width:70ch}
.task-box{border-left:4px solid var(--teal)}
.q{padding:18px 0;border-bottom:1px solid var(--line)}
.q:last-of-type{border-bottom:0}
.q p{font-weight:600;margin-bottom:10px}
.q label{display:flex;gap:10px;align-items:flex-start;font-weight:400;padding:6px 0;cursor:pointer}
.avatar{width:84px;height:84px;border-radius:50%;object-fit:cover;border:3px solid var(--line)}

/* Admin */
.adm{display:grid;grid-template-columns:240px 1fr;min-height:100vh}
.side{background:var(--deep);padding:20px 16px;position:sticky;top:0;align-self:start;height:100vh;overflow:auto}
.side .brand{display:block;background:#fff;border-radius:8px;padding:10px 12px;margin-bottom:22px}
.side nav{display:grid;gap:4px}
.side nav a{display:flex;justify-content:space-between;align-items:center;color:#C5DCE2;text-decoration:none;font-family:var(--fd);font-weight:500;padding:10px 12px;border-radius:6px}
.side nav a:hover{background:rgba(255,255,255,.08)}
.side nav a.on{background:var(--teal);color:#fff}
.pill{background:var(--amber);color:var(--deep);font-size:.75rem;font-weight:700;border-radius:99px;padding:1px 8px}
.adm-main{padding:28px clamp(18px,3vw,40px) 60px;min-width:0}
.adm-title{margin-bottom:22px}
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:14px;margin-bottom:24px}
.stat{background:#fff;border:1px solid var(--line);border-radius:10px;padding:18px}
.stat b{display:block;font-family:var(--fd);font-size:2rem;color:var(--petrol)}
.tbl-wrap{overflow-x:auto;background:#fff;border:1px solid var(--line);border-radius:10px}
table{width:100%;border-collapse:collapse;font-size:.94rem}
th,td{text-align:left;padding:11px 14px;border-bottom:1px solid var(--line);vertical-align:top}
th{font-family:var(--fd);font-size:.85rem;background:#EAF2F4;color:var(--petrol)}
tr:last-child td{border-bottom:0}
.actions{display:flex;gap:8px;flex-wrap:wrap;align-items:center}
.inline{display:inline}
.toolbar{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:16px;align-items:center}
.toolbar input{max-width:320px}
@media(max-width:860px){
  .adm{grid-template-columns:1fr}
  .side{position:static;height:auto}
  .side nav{grid-template-columns:repeat(auto-fit,minmax(130px,1fr))}
  .row2{grid-template-columns:1fr}
  .topnav{gap:12px;font-size:.92rem}
}

/* Certificado y credencial */
.cert-actions{display:flex;gap:10px;margin-bottom:20px;flex-wrap:wrap}
.cert{background:#fff;border:2px solid var(--petrol);outline:6px solid var(--paper);outline-offset:-14px;padding:48px 40px;text-align:center;max-width:900px;margin:0 auto 32px;position:relative}
.cert img.logo{height:70px;margin:0 auto 18px}
.cert h2{font-size:2.1rem;color:var(--petrol);margin-bottom:6px}
.cert .who{font-family:var(--fd);font-size:2.2rem;color:var(--teal);margin:18px 0 6px}
.cert .course{font-family:var(--fd);font-size:1.4rem;margin:8px 0 22px}
.cert .meta{display:flex;justify-content:space-between;align-items:flex-end;gap:16px;margin-top:30px;text-align:left;font-size:.9rem;flex-wrap:wrap}
.qr{width:96px;height:96px}
.qr img,.qr canvas{width:96px!important;height:96px!important}
.idcard{width:340px;background:#fff;border:2px solid var(--petrol);border-radius:14px;overflow:hidden;margin:0 auto}
.idcard .hd{background:var(--petrol);padding:10px 14px;display:flex;align-items:center;justify-content:space-between}
.idcard .hd span{color:#fff;font-family:var(--fd);font-weight:600;font-size:.9rem}
.idcard .hd img{height:30px;background:#fff;border-radius:4px;padding:3px 6px}
.idcard .bd{display:flex;gap:14px;padding:14px}
.idcard .photo{width:92px;height:116px;object-fit:cover;border-radius:6px;border:2px solid var(--line);background:#EAF2F4}
.idcard .nm{font-family:var(--fd);font-weight:700;font-size:1.05rem;line-height:1.2}
.idcard .ft{display:flex;justify-content:space-between;align-items:center;padding:0 14px 14px;gap:10px;font-size:.78rem}
.idcard .qr{width:72px;height:72px}.idcard .qr img,.idcard .qr canvas{width:72px!important;height:72px!important}
@media print{
  @page{size:A4 landscape;margin:10mm}
  body{background:#fff}
  .topbar,.foot,.cert-actions,.flash{display:none!important}
  .page{padding:0}.cert{margin-bottom:16px;break-inside:avoid}
}