/* ============================================================
   AulaEdUC 2.0 — Sistema de diseño
   Paleta: índigo docente + verde inclusión + ámbar acento
   ============================================================ */
:root{
  --brand-900:#12183a; --brand-800:#1b2352; --brand-700:#2a3374; --brand-600:#3b46a8;
  --brand-500:#4f5bd5; --brand-400:#7b85e8; --brand-100:#e8eafc; --brand-50:#f5f6fe;
  --teal-600:#0f766e; --teal-500:#14b8a6; --teal-100:#ccfbf1;
  --amber-500:#f59e0b; --amber-100:#fef3c7; --amber-700:#b45309;
  --rose-600:#e11d48; --rose-100:#ffe4e6;
  --ink:#111827; --ink-2:#374151; --ink-3:#6b7280; --ink-4:#9ca3af;
  --line:#e5e7eb; --line-2:#f1f2f6;
  --bg:#f7f8fc; --card:#ffffff;
  --ok:#059669; --ok-bg:#ecfdf5;
  --warn:#b45309; --warn-bg:#fffbeb;
  --err:#dc2626; --err-bg:#fef2f2;
  --r-sm:8px; --r:12px; --r-lg:16px; --r-xl:22px;
  --sh-1:0 1px 2px rgba(16,24,40,.05);
  --sh-2:0 4px 12px rgba(16,24,40,.08);
  --sh-3:0 12px 32px rgba(16,24,40,.12);
  --sidebar-w:262px;
  --font:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Helvetica,Arial,sans-serif;
}
:root[data-theme="dark"]{
  --ink:#f3f4f6; --ink-2:#d1d5db; --ink-3:#9ca3af; --ink-4:#6b7280;
  --line:#252a3d; --line-2:#1c2130; --bg:#0d1020; --card:#151a2b;
  --brand-50:#161c31; --brand-100:#1e2540;
  --ok-bg:#062e26; --warn-bg:#2a2007; --err-bg:#2b1214;
  --sh-2:0 4px 14px rgba(0,0,0,.4); --sh-3:0 16px 40px rgba(0,0,0,.5);
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  font-family:var(--font); background:var(--bg); color:var(--ink);
  line-height:1.6; -webkit-font-smoothing:antialiased; font-size:15px;
}
a{color:var(--brand-600); text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3,h4{margin:0; line-height:1.25; letter-spacing:-.02em}
img,video{max-width:100%}
svg{width:16px; height:16px; flex:0 0 auto}  /* tamaño base; cada componente lo ajusta */
button{font-family:inherit}
:focus-visible{outline:3px solid var(--brand-400); outline-offset:2px; border-radius:6px}

/* ---------- Utilidades ---------- */
.muted{color:var(--ink-3)}
.small{font-size:13px}
.tiny{font-size:12px}
.center{text-align:center}
.row{display:flex; gap:10px; align-items:center}
.row.wrap{flex-wrap:wrap}
.spread{display:flex; justify-content:space-between; align-items:center; gap:12px}
.grow{flex:1; min-width:0}
.hide{display:none !important}
.truncate{overflow:hidden; text-overflow:ellipsis; white-space:nowrap}
.stack{display:flex; flex-direction:column; gap:14px}
.grid{display:grid; gap:18px}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);border:0}

/* ---------- Botones ---------- */
.btn{
  display:inline-flex; align-items:center; justify-content:center; gap:8px;
  padding:10px 16px; border-radius:10px; border:1px solid transparent;
  background:var(--brand-500); color:#fff; font-weight:650; font-size:14px;
  cursor:pointer; transition:transform .06s ease, background .15s ease, box-shadow .15s ease;
  white-space:nowrap;
}
.btn:hover{background:var(--brand-600); text-decoration:none}
.btn:active{transform:translateY(1px)}
.btn[disabled]{opacity:.55; cursor:not-allowed}
.btn-ghost{background:var(--card); color:var(--ink-2); border-color:var(--line)}
.btn-ghost:hover{background:var(--brand-50); color:var(--brand-600); border-color:var(--brand-400)}
.btn-soft{background:var(--brand-100); color:var(--brand-700)}
.btn-soft:hover{background:var(--brand-400); color:#fff}
.btn-danger{background:var(--err)}
.btn-danger:hover{background:#b91c1c}
.btn-teal{background:var(--teal-600)}
.btn-teal:hover{background:#115e59}
.btn-sm{padding:7px 12px; font-size:13px; border-radius:8px}
.btn-lg{padding:13px 22px; font-size:15.5px}
.btn-block{width:100%}
.btn svg{width:17px; height:17px}

/* ---------- Formularios ---------- */
.field{display:flex; flex-direction:column; gap:6px; margin-bottom:14px}
.field label{font-size:13px; font-weight:650; color:var(--ink-2)}
.input, select.input, textarea.input{
  width:100%; padding:11px 13px; border:1px solid var(--line); border-radius:10px;
  font-size:14.5px; background:var(--card); color:var(--ink); font-family:inherit;
  transition:border-color .15s, box-shadow .15s;
}
.input:focus{outline:none; border-color:var(--brand-400); box-shadow:0 0 0 3px var(--brand-100)}
.input::placeholder{color:var(--ink-4)}
textarea.input{resize:vertical; min-height:80px}
.hint{font-size:12.5px; color:var(--ink-3)}
.form-error{
  display:none; background:var(--err-bg); color:var(--err); border:1px solid #fecaca;
  padding:10px 12px; border-radius:10px; font-size:13.5px; margin-bottom:12px;
}
.form-error.show{display:block}
.switch{display:inline-flex; align-items:center; gap:8px; cursor:pointer; font-size:13.5px; color:var(--ink-2)}

/* ---------- Login ---------- */
.auth{min-height:100vh; display:grid; grid-template-columns:1.05fr .95fr}
.auth-hero{
  position:relative; overflow:hidden; color:#fff; padding:48px 52px;
  background:radial-gradient(1200px 600px at 10% -10%, #4f5bd5 0%, transparent 55%),
             radial-gradient(900px 500px at 90% 110%, #14b8a6 0%, transparent 55%),
             linear-gradient(160deg,#12183a,#1b2352 60%,#222a5e);
  display:flex; flex-direction:column; justify-content:space-between;
}
.auth-hero::after{
  content:''; position:absolute; inset:0;
  background-image:radial-gradient(rgba(255,255,255,.14) 1px, transparent 1px);
  background-size:22px 22px; opacity:.35; pointer-events:none;
}
.auth-brand{display:flex; align-items:center; gap:12px; position:relative; z-index:1}
.logo-badge{
  width:44px; height:44px; border-radius:13px; display:grid; place-items:center;
  background:linear-gradient(140deg,#7b85e8,#14b8a6); box-shadow:var(--sh-2);
}
.logo-badge svg{width:24px; height:24px; color:#fff}
.brand-name{font-size:19px; font-weight:800; letter-spacing:-.02em}
.brand-name span{color:#a7b0f5}
.brand-sub{font-size:12.5px; color:#c7cbf0; letter-spacing:.02em}
.auth-copy{position:relative; z-index:1; max-width:520px; margin:38px 0}
.auth-copy h1{font-size:clamp(28px,3vw,40px); line-height:1.1; margin-bottom:14px}
.auth-copy p{color:#d6d9f5; font-size:15.5px; margin:0 0 26px}
.auth-feats{display:grid; gap:14px; max-width:480px}
.auth-feat{display:flex; gap:13px; align-items:flex-start; background:rgba(255,255,255,.07);
  border:1px solid rgba(255,255,255,.12); padding:13px 15px; border-radius:14px; backdrop-filter:blur(4px)}
.auth-feat .ico{width:34px;height:34px;border-radius:10px;background:rgba(255,255,255,.14);
  display:grid;place-items:center;flex:0 0 auto}
.auth-feat .ico svg{width:18px;height:18px;color:#fff}
.auth-feat b{display:block; font-size:14px; margin-bottom:2px}
.auth-feat span{font-size:13px; color:#c9cdf1; line-height:1.45}
.auth-foot{position:relative; z-index:1; font-size:12.5px; color:#9aa1d6}

.auth-panel{display:flex; align-items:center; justify-content:center; padding:40px 28px; background:var(--card)}
.auth-card{width:100%; max-width:430px}
.auth-card h2{font-size:24px; margin-bottom:4px}
.auth-tabs{display:flex; gap:4px; background:var(--brand-50); padding:4px; border-radius:12px; margin:18px 0 22px}
.auth-tabs button{
  flex:1; padding:9px 10px; border:0; background:transparent; border-radius:9px;
  font-weight:650; font-size:14px; color:var(--ink-3); cursor:pointer;
}
.auth-tabs button.active{background:var(--card); color:var(--brand-600); box-shadow:var(--sh-1)}
.demo-label{font-size:12px; font-weight:700; letter-spacing:.06em; text-transform:uppercase;
  color:var(--ink-4); margin:24px 0 10px; display:flex; align-items:center; gap:8px}
.demo-label::after{content:''; flex:1; height:1px; background:var(--line)}
.demo-users{display:grid; gap:8px}
.demo-user{
  display:flex; align-items:center; gap:11px; padding:9px 12px; border:1px solid var(--line);
  border-radius:11px; background:var(--card); cursor:pointer; text-align:left; width:100%;
  transition:border-color .15s, background .15s, transform .06s;
}
.demo-user:hover{border-color:var(--brand-400); background:var(--brand-50); transform:translateY(-1px)}
.avatar{width:34px;height:34px;border-radius:50%;display:grid;place-items:center;
  color:#fff;font-weight:750;font-size:12.5px;flex:0 0 auto;letter-spacing:.02em}
.demo-user .u-name{font-size:13.5px; font-weight:650}
.demo-user .u-mail{font-size:12px; color:var(--ink-3)}
.demo-user > .grow{min-width:0}
.demo-user .u-name, .demo-user .u-mail{overflow:hidden; text-overflow:ellipsis; white-space:nowrap}
.demo-user svg{width:15px; height:15px; color:var(--ink-4)}
@media(max-width:900px){
  .auth{grid-template-columns:1fr}
  .auth-hero{padding:32px 24px; min-height:auto}
  .auth-feats{display:none}
  .auth-copy{margin:22px 0}
}

/* ---------- Shell ---------- */
.shell{display:none; min-height:100vh}
.shell.ready{display:flex}
.sidebar{
  width:var(--sidebar-w); flex:0 0 var(--sidebar-w); background:var(--brand-900); color:#e9ebfb;
  display:flex; flex-direction:column; padding:18px 14px; position:sticky; top:0; height:100vh;
}
:root[data-theme="dark"] .sidebar{background:#0a0d1a; border-right:1px solid var(--line)}
.side-brand{display:flex; align-items:center; gap:11px; padding:4px 6px 18px}
.side-brand .logo-badge{width:38px;height:38px;border-radius:11px}
.side-brand .brand-name{font-size:16px; color:#fff}
.side-brand .brand-sub{font-size:11px; color:#9aa1d6}
.nav-label{font-size:10.5px; letter-spacing:.09em; text-transform:uppercase; color:#7c85c4;
  padding:14px 10px 6px; font-weight:750}
.nav-item{
  display:flex; align-items:center; gap:11px; padding:10px 11px; border-radius:10px;
  color:#c9cdf1; font-size:14px; font-weight:600; text-decoration:none; margin-bottom:2px;
  transition:background .15s, color .15s;
}
.nav-item:hover{background:rgba(255,255,255,.08); color:#fff; text-decoration:none}
.nav-item.active{background:var(--brand-500); color:#fff; box-shadow:0 6px 16px rgba(79,91,213,.4)}
.nav-item svg{width:18px;height:18px;flex:0 0 auto;opacity:.95}
.side-user{margin-top:auto; display:flex; align-items:center; gap:10px; padding:12px 10px 4px;
  border-top:1px solid rgba(255,255,255,.1)}
.side-user .u-name{font-size:13.5px; font-weight:650; color:#fff}
.side-user .u-role{font-size:11.5px; color:#9aa1d6}
.logout-btn{margin-left:auto; background:rgba(255,255,255,.08); border:0; color:#c9cdf1;
  width:32px;height:32px;border-radius:9px;display:grid;place-items:center;cursor:pointer}
.logout-btn:hover{background:var(--rose-600); color:#fff}
.logout-btn svg{width:16px;height:16px}

.main{flex:1; min-width:0; display:flex; flex-direction:column}
.topbar{
  display:flex; align-items:center; gap:14px; padding:12px 26px;
  background:color-mix(in srgb, var(--card) 88%, transparent); border-bottom:1px solid var(--line);
  position:sticky; top:0; z-index:20; backdrop-filter:blur(10px);
}
.menu-btn{display:none; background:var(--card); border:1px solid var(--line); border-radius:10px;
  width:38px;height:38px;place-items:center;cursor:pointer;color:var(--ink-2)}
.menu-btn svg{width:19px;height:19px}
.topbar-title{font-size:15.5px; font-weight:750; letter-spacing:-.02em}
.topbar-sub{font-size:12.5px; color:var(--ink-3)}
.topbar-actions{margin-left:auto; display:flex; align-items:center; gap:8px}
.icon-btn{background:var(--card); border:1px solid var(--line); border-radius:10px;
  width:38px;height:38px;display:grid;place-items:center;cursor:pointer;color:var(--ink-2)}
.icon-btn:hover{background:var(--brand-50); color:var(--brand-600)}
.icon-btn svg{width:18px;height:18px}
.view{padding:26px; max-width:1240px; width:100%; margin:0 auto}

/* ---------- Tarjetas y bloques ---------- */
.card{background:var(--card); border:1px solid var(--line); border-radius:var(--r-lg); box-shadow:var(--sh-1)}
.card-pad{padding:20px}
.card-head{display:flex; align-items:center; justify-content:space-between; gap:12px;
  padding:16px 20px; border-bottom:1px solid var(--line)}
.card-head h3{font-size:15.5px}
.page-head{margin-bottom:22px}
.page-head h2{font-size:24px; margin-bottom:4px}
.page-head p{margin:0; color:var(--ink-3); font-size:14px}

.stats{display:grid; grid-template-columns:repeat(auto-fit,minmax(190px,1fr)); gap:14px; margin-bottom:22px}
.stat{background:var(--card); border:1px solid var(--line); border-radius:var(--r-lg); padding:16px 18px}
.stat .lbl{font-size:12px; color:var(--ink-3); font-weight:650; text-transform:uppercase; letter-spacing:.05em}
.stat .val{font-size:29px; font-weight:800; letter-spacing:-.03em; margin-top:6px; line-height:1.1}
.stat .sub{font-size:12.5px; color:var(--ink-3); margin-top:4px}
.stat.accent{background:linear-gradient(150deg,var(--brand-500),var(--brand-700)); border:0; color:#fff}
.stat.accent .lbl,.stat.accent .sub{color:#d9dcfb}
.stat.teal{background:linear-gradient(150deg,var(--teal-500),var(--teal-600)); border:0; color:#fff}
.stat.teal .lbl,.stat.teal .sub{color:#c9fbf2}

/* ---------- Progreso ---------- */
.progress{flex:1 1 auto; min-width:40px; height:8px; background:var(--line-2); border-radius:999px; overflow:hidden}
.progress > i{display:block; height:100%; border-radius:999px;
  background:linear-gradient(90deg,var(--brand-500),var(--teal-500)); transition:width .5s ease}
.progress.sm{height:6px}
.pct{font-size:12.5px; font-weight:700; color:var(--brand-600)}

/* Tarjeta "continuar donde quedaste" */
.next-card{overflow:hidden; margin-bottom:22px}
.next-grid{display:grid; grid-template-columns:1.15fr .85fr; gap:0}
.next-cover{display:grid; place-items:center; color:#fff; min-height:180px}
.next-cover svg{width:30px; height:30px}
@media(max-width:760px){
  .next-grid{grid-template-columns:1fr}
  .next-cover{min-height:104px; order:-1}
}

/* ---------- Catálogo ---------- */
.toolbar{display:flex; gap:10px; flex-wrap:wrap; margin-bottom:18px; align-items:center}
.search{position:relative; flex:1; min-width:220px}
.search svg{position:absolute; left:12px; top:50%; transform:translateY(-50%);
  width:17px;height:17px;color:var(--ink-4)}
.search .input{padding-left:38px}
.chips{display:flex; gap:6px; flex-wrap:wrap}
.chip{padding:7px 13px; border-radius:999px; border:1px solid var(--line); background:var(--card);
  font-size:13px; font-weight:620; color:var(--ink-2); cursor:pointer}
.chip:hover{border-color:var(--brand-400); color:var(--brand-600)}
.chip.active{background:var(--brand-500); border-color:var(--brand-500); color:#fff}

.courses{display:grid; grid-template-columns:repeat(auto-fill,minmax(290px,1fr)); gap:18px}
.course-card{background:var(--card); border:1px solid var(--line); border-radius:var(--r-lg);
  overflow:hidden; display:flex; flex-direction:column; transition:transform .15s, box-shadow .15s, border-color .15s}
.course-card:hover{transform:translateY(-3px); box-shadow:var(--sh-3); border-color:var(--brand-400)}
.course-cover{height:132px; position:relative; display:grid; place-items:center; color:#fff}
.course-cover svg{width:34px;height:34px;opacity:.95}
.course-cover .badge{position:absolute; top:10px; left:10px; background:rgba(0,0,0,.28);
  backdrop-filter:blur(4px); border:1px solid rgba(255,255,255,.25); color:#fff;
  font-size:11px; font-weight:700; padding:3px 9px; border-radius:999px; letter-spacing:.03em}
.course-body{padding:15px 16px 16px; display:flex; flex-direction:column; gap:9px; flex:1}
.course-body h4{font-size:15.5px; line-height:1.3}
.course-desc{font-size:13px; color:var(--ink-3); display:-webkit-box; -webkit-line-clamp:2;
  -webkit-box-orient:vertical; overflow:hidden; min-height:36px}
.course-meta{display:flex; gap:12px; font-size:12px; color:var(--ink-3); flex-wrap:wrap; margin-top:auto}
.course-meta span{display:inline-flex; align-items:center; gap:5px}
.course-meta svg{width:14px;height:14px}
.course-foot{display:flex; align-items:center; gap:10px; margin-top:6px}

/* ---------- Detalle de curso ---------- */
.course-hero{border-radius:var(--r-xl); padding:30px; color:#fff; margin-bottom:22px; position:relative; overflow:hidden}
.course-hero::after{content:''; position:absolute; inset:0;
  background-image:radial-gradient(rgba(255,255,255,.16) 1px, transparent 1px); background-size:20px 20px; opacity:.3}
.course-hero > *{position:relative; z-index:1}
.course-hero h2{font-size:clamp(21px,2.6vw,29px); margin-bottom:8px}
.course-hero p{color:rgba(255,255,255,.9); max-width:720px; margin:0 0 16px; font-size:14.5px}
.hero-tags{display:flex; gap:8px; flex-wrap:wrap; margin-bottom:18px}
.hero-tag{background:rgba(255,255,255,.16); border:1px solid rgba(255,255,255,.25);
  padding:4px 11px; border-radius:999px; font-size:12px; font-weight:650}
.hero-progress{max-width:420px}
.hero-progress .progress{background:rgba(255,255,255,.25); height:9px}
.hero-progress .progress > i{background:#fff}
.hero-progress .small{color:#e8eafc; margin-bottom:6px}

.lesson-list{display:flex; flex-direction:column; gap:8px}
.lesson{
  display:flex; align-items:center; gap:13px; padding:13px 15px; border:1px solid var(--line);
  border-radius:12px; background:var(--card); text-decoration:none; color:inherit;
  transition:border-color .15s, background .15s;
}
.lesson:hover{border-color:var(--brand-400); background:var(--brand-50); text-decoration:none}
.lesson.done{background:var(--ok-bg); border-color:#a7f3d0}
.lesson .num{width:30px;height:30px;border-radius:9px;background:var(--brand-100);color:var(--brand-700);
  display:grid;place-items:center;font-size:12.5px;font-weight:800;flex:0 0 auto}
.lesson.done .num{background:var(--ok); color:#fff}
.lesson .num svg{width:15px;height:15px}
.lesson .lt{font-size:14px; font-weight:650}
.lesson .lm{font-size:12px; color:var(--ink-3)}
.lesson .go{margin-left:auto; color:var(--ink-4)}
.lesson .go svg{width:17px;height:17px}

/* ---------- Reproductor ---------- */
.player-wrap{background:#0b0f1f; border-radius:var(--r-lg); overflow:hidden}
.player-wrap video{display:block; width:100%; max-height:62vh; background:#000}
.player-body{background:var(--card); border:1px solid var(--line); border-top:0;
  border-radius:0 0 var(--r-lg) var(--r-lg); padding:22px}
.player-body h2{font-size:20px; margin-bottom:6px}
.lesson-content{font-size:14.8px; color:var(--ink-2)}
.lesson-content h3{font-size:16px; margin:20px 0 8px; color:var(--ink)}
.lesson-content h4{font-size:14.5px; margin:16px 0 6px}
.lesson-content ul,.lesson-content ol{padding-left:22px}
.lesson-content li{margin:5px 0}
.lesson-content table{border-collapse:collapse; width:100%; font-size:13.5px; margin:12px 0}
.lesson-content th,.lesson-content td{border:1px solid var(--line); padding:8px 10px; text-align:left; vertical-align:top}
.lesson-content th{background:var(--brand-50); font-size:12.5px}
.note{border-left:4px solid var(--brand-500); background:var(--brand-50); padding:12px 14px;
  border-radius:10px; margin:12px 0; font-size:13.8px}
.note.teal{border-color:var(--teal-500); background:var(--ok-bg)}
.note.amber{border-color:var(--amber-500); background:var(--warn-bg)}
.player-nav{display:flex; gap:10px; margin-top:20px; flex-wrap:wrap}

/* ---------- Tablas admin ---------- */
.table-wrap{overflow-x:auto; border-radius:var(--r-lg); border:1px solid var(--line); background:var(--card)}
table.data{width:100%; border-collapse:collapse; font-size:13.8px; min-width:620px}
table.data th{text-align:left; padding:11px 14px; background:var(--brand-50); color:var(--ink-2);
  font-size:11.5px; letter-spacing:.05em; text-transform:uppercase; font-weight:750; border-bottom:1px solid var(--line)}
table.data td{padding:11px 14px; border-bottom:1px solid var(--line-2); vertical-align:middle}
table.data tr:last-child td{border-bottom:0}
table.data tr:hover td{background:var(--brand-50)}
.tag{display:inline-block; padding:2px 9px; border-radius:999px; font-size:11.5px; font-weight:700}
.tag.ok{background:var(--ok-bg); color:var(--ok)}
.tag.warn{background:var(--warn-bg); color:var(--warn)}
.tag.err{background:var(--err-bg); color:var(--err)}
.tag.info{background:var(--brand-100); color:var(--brand-700)}
.tag.role-admin{background:#ede9fe; color:#6d28d9}
.tag.role-instructor{background:var(--brand-100); color:var(--brand-700)}
.tag.role-colaborador{background:var(--teal-100); color:#0f766e}

/* ---------- Modal / toast ---------- */
.modal-back{position:fixed; inset:0; background:rgba(10,14,30,.55); backdrop-filter:blur(3px);
  display:none; align-items:center; justify-content:center; padding:20px; z-index:80}
.modal-back.open{display:flex}
.modal{background:var(--card); border-radius:var(--r-lg); width:100%; max-width:520px;
  box-shadow:var(--sh-3); max-height:90vh; overflow:auto; animation:pop .16s ease}
@keyframes pop{from{transform:translateY(8px) scale(.99); opacity:0} to{transform:none; opacity:1}}
.modal-head{display:flex; align-items:center; justify-content:space-between; padding:16px 20px;
  border-bottom:1px solid var(--line)}
.modal-head h3{font-size:16.5px}
.modal-body{padding:20px}
.modal-foot{display:flex; gap:10px; justify-content:flex-end; padding:14px 20px; border-top:1px solid var(--line)}
.x-btn{background:transparent; border:0; color:var(--ink-3); cursor:pointer; font-size:22px; line-height:1; padding:4px 6px}
.x-btn:hover{color:var(--ink)}

.toasts{position:fixed; right:18px; bottom:18px; display:flex; flex-direction:column; gap:9px; z-index:100}
.toast{background:var(--card); border:1px solid var(--line); border-left:4px solid var(--brand-500);
  padding:12px 15px; border-radius:11px; box-shadow:var(--sh-3); font-size:13.8px; min-width:250px;
  animation:slide .18s ease}
.toast.ok{border-left-color:var(--ok)} .toast.err{border-left-color:var(--err)}
.toast b{display:block; margin-bottom:1px}
@keyframes slide{from{transform:translateX(14px); opacity:0} to{transform:none; opacity:1}}

/* ---------- Certificado ---------- */
.cert{background:var(--card); border:1px solid var(--line); border-radius:var(--r-lg); overflow:hidden;
  display:flex; flex-direction:column}
.cert-preview{padding:22px; background:linear-gradient(150deg,var(--brand-50),var(--card)); flex:1}
.cert-paper{border:2px solid var(--brand-500); border-radius:12px; padding:26px; text-align:center;
  background:var(--card); position:relative}
.cert-paper::before{content:''; position:absolute; inset:8px; border:1px solid var(--brand-100); border-radius:8px; pointer-events:none}
.cert-paper .seal{width:56px;height:56px;border-radius:50%;margin:0 auto 12px;
  background:linear-gradient(140deg,var(--brand-500),var(--teal-500)); display:grid; place-items:center}
.cert-paper .seal svg{width:28px;height:28px;color:#fff}
.cert-paper h3{font-size:13px; letter-spacing:.16em; text-transform:uppercase; color:var(--ink-3); font-weight:700}
.cert-paper .who{font-size:25px; font-weight:800; margin:12px 0 4px; letter-spacing:-.03em}
.cert-paper .what{font-size:14.5px; color:var(--ink-2); max-width:440px; margin:0 auto; line-height:1.5}
.cert-paper .meta{display:flex; justify-content:center; gap:22px; margin-top:18px; flex-wrap:wrap;
  font-size:11.5px; color:var(--ink-3)}
.cert-paper .meta b{display:block; color:var(--ink); font-size:12.5px}
.cert-paper .code{margin-top:16px; font-family:ui-monospace,Menlo,monospace; font-size:11.5px; color:var(--ink-4)}

/* ---------- Estados vacíos / skeletons ---------- */
.empty-state{display:flex; flex-direction:column; align-items:center; gap:8px; text-align:center;
  padding:52px 22px; color:var(--ink-3); background:var(--card); border:1px dashed var(--line); border-radius:var(--r-lg)}
.empty-state svg{width:38px;height:38px;color:var(--ink-4)}
.empty-state b{color:var(--ink); font-size:15.5px}
.skel{background:linear-gradient(90deg,var(--line-2) 25%,var(--line) 37%,var(--line-2) 63%);
  background-size:400% 100%; animation:sk 1.3s infinite; border-radius:10px}
@keyframes sk{0%{background-position:100% 50%}100%{background-position:0 50%}}
.skel-card{height:250px} .skel-line{height:14px; margin-bottom:10px}

/* ---------- Responsive ---------- */
@media(max-width:1000px){
  .sidebar{position:fixed; left:0; top:0; z-index:60; transform:translateX(-104%);
    transition:transform .22s ease; box-shadow:var(--sh-3)}
  .sidebar.open{transform:none}
  .menu-btn{display:grid}
  .view{padding:18px}
  .topbar{padding:10px 16px}
}
@media(max-width:640px){
  .courses{grid-template-columns:1fr}
  .course-hero{padding:22px}
  .stats{grid-template-columns:1fr 1fr}
  .stat .val{font-size:24px}
}

/* ---------- Impresión (certificados) ---------- */
@media print{
  .sidebar,.topbar,.no-print,.toasts{display:none !important}
  body{background:#fff}
  .shell{display:block}
  .main{display:block}
  .view{padding:0; max-width:none}
  .cert-preview{padding:0; background:#fff}
  .cert-paper{border-color:#333; break-inside:avoid}
  .cert-preview{display:flex !important; justify-content:center; align-items:flex-start; padding:0 !important}
  .cert-preview .cert-paper{width:257mm; max-width:257mm; min-height:170mm;
    display:flex; flex-direction:column; justify-content:center;
    box-shadow:none; border:2px solid #2a3374; padding:20mm}
  .cert-paper h3{font-size:22px}
  .cert-paper .who{font-size:34px; margin:10mm 0 4mm}
  .cert-paper .what{font-size:15px; line-height:1.7; max-width:190mm; margin:0 auto}
  .cert-paper .meta{margin-top:12mm}
  .cert-paper .seal{width:56px; height:56px; margin:0 auto 6mm}
  @page{size:A4 landscape; margin:0}
}
@media(prefers-reduced-motion:reduce){*{animation:none !important; transition:none !important}}