/* ===== NEXUS · Aula Virtual ===== */
:root{
  --red:#ea4e4f; --red-dark:#d63e3f; --ink:#1c2126; --muted:#6b7280;
  --teal:#234c5b; --bg:#f6f7f9; --card:#ffffff; --line:#ececef;
  --ok:#16a34a; --okbg:#e9f7ee; --errbg:#fdeaea; --warnbg:#fff7e6;
  --radius:14px; --shadow:0 1px 2px rgba(16,24,40,.04),0 4px 16px rgba(16,24,40,.06);
}
*{box-sizing:border-box}
html,body{margin:0}
body{font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  color:var(--ink);background:var(--bg);line-height:1.55;-webkit-font-smoothing:antialiased}
a{color:var(--red);text-decoration:none}
a:hover{text-decoration:underline}
h1{font-size:30px;line-height:1.15;margin:.1em 0 .2em;letter-spacing:-.01em}
h2{font-size:18px;margin:0 0 14px}
h3{font-size:15px;margin:0 0 8px}
img{max-width:100%}
.muted{color:var(--muted)}
.small{font-size:13px}
.center{text-align:center}
.right{text-align:right}
.kicker{display:inline-block;color:var(--red);font-weight:700;font-size:12px;letter-spacing:.12em;text-transform:uppercase;margin-bottom:6px}

/* ---- Auth ---- */
.auth-bg{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:24px;
  background:radial-gradient(900px 500px at 50% -10%,#fff,transparent),var(--bg)}
.auth-card{width:100%;max-width:400px;background:var(--card);border:1px solid var(--line);
  border-radius:18px;box-shadow:var(--shadow);padding:34px 30px}
.auth-card .brand{margin-bottom:16px}
.auth-card h1{font-size:24px}
.auth-card label{display:block;font-size:13px;font-weight:600;margin:14px 0 6px}
.loglist{font-size:14px;color:var(--muted);padding-left:18px}

/* ---- Inputs / buttons ---- */
input[type=text],input[type=email],input[type=password],input[type=number],select,textarea{
  width:100%;padding:11px 13px;border:1px solid #d9dce1;border-radius:10px;font:inherit;background:#fff;color:var(--ink)}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--red);box-shadow:0 0 0 3px rgba(234,78,79,.15)}
textarea{resize:vertical}
.btn{display:inline-flex;align-items:center;gap:6px;justify-content:center;border:1px solid transparent;
  border-radius:10px;padding:10px 16px;font-weight:600;font-size:14px;cursor:pointer;transition:.15s;background:#eef0f3;color:var(--ink)}
.btn:hover{text-decoration:none;filter:brightness(.98)}
.btn-primary{background:var(--red);color:#fff}
.btn-primary:hover{background:var(--red-dark)}
.btn-ghost{background:#fff;border-color:#d9dce1;color:var(--ink)}
.btn-danger{background:#fff;border-color:#f0c2c2;color:var(--red)}
.btn-danger:hover{background:var(--errbg)}
.btn-done{background:var(--okbg);color:var(--ok);border-color:#bfe6cd}
.btn-sm{padding:6px 11px;font-size:13px}
.btn.block{width:100%;margin-top:18px}
.inline{display:inline}

/* ---- Topbar ---- */
.topbar{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20}
.topbar-in{max-width:1080px;margin:0 auto;padding:12px 20px;display:flex;align-items:center;gap:22px}
.topbar .brand{display:flex;align-items:center}
.topnav{display:flex;gap:6px;flex:1}
.topnav a{color:var(--muted);font-weight:600;font-size:14px;padding:7px 12px;border-radius:8px}
.topnav a:hover{color:var(--ink);background:#f3f4f6;text-decoration:none}
.topnav a.on{color:var(--red);background:rgba(234,78,79,.08)}
.topright{display:flex;align-items:center;gap:12px}
.who{font-size:14px;font-weight:600}

/* ---- Layout ---- */
.wrap{max-width:1080px;margin:0 auto;padding:28px 20px 60px}
.page-head{margin:6px 0 22px}
.page-head.between{display:flex;justify-content:space-between;align-items:flex-end;gap:16px}
.back{display:inline-block;color:var(--muted);font-weight:600;font-size:14px;margin-bottom:10px}
.cols{display:grid;grid-template-columns:1fr 1fr;gap:18px}
@media(max-width:760px){.cols{grid-template-columns:1fr}.page-head.between{flex-direction:column;align-items:flex-start}}

/* ---- Cards / grid ---- */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(290px,1fr));gap:20px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden;display:block;color:inherit}
.card:hover{text-decoration:none}
.card.course:hover{transform:translateY(-2px);transition:.15s;box-shadow:0 6px 22px rgba(16,24,40,.1)}
.card-cover{height:120px;background:linear-gradient(135deg,#0f2330,#234c5b);position:relative;display:flex;gap:8px;padding:12px;align-items:flex-start}
.card-body{padding:16px 18px 18px}
.card-body h3{font-size:16px}
.clamp{display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;font-size:13px;min-height:38px}

/* ---- Badges / tags ---- */
.badge{font-size:11px;font-weight:700;padding:4px 9px;border-radius:20px;background:#fff;color:var(--teal)}
.badge.dark{background:rgba(255,255,255,.16);color:#fff}
.badge.level-principiante{background:#e7f3ff;color:#1d6fb8}
.badge.level-intermedio{background:#e9f7ee;color:#1a8a4d}
.badge.level-avanzado{background:#fdeaea;color:var(--red)}
.tag{display:inline-block;font-size:11px;font-weight:700;padding:3px 9px;border-radius:20px;text-transform:capitalize}
.tag-admin{background:rgba(234,78,79,.1);color:var(--red)}
.tag-activo{background:var(--okbg);color:var(--ok)}
.tag-pendiente{background:var(--warnbg);color:#b7791f}
.tag-suspendido{background:#eef0f3;color:var(--muted)}
.tag-toggle{border:none;cursor:pointer;font:inherit;font-size:11px;font-weight:700}

/* ---- Progress ---- */
.progress{height:7px;background:#eceef1;border-radius:20px;overflow:hidden;margin:14px 0 6px}
.progress.big{height:10px;max-width:420px}
.progress span{display:block;height:100%;background:var(--red);border-radius:20px}
.progress-meta{font-size:12px;color:var(--muted)}

/* ---- Panels / tables ---- */
.panel{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:20px 22px;margin-bottom:18px}
.foldable{display:none}
.foldable.open{display:block}
.table{width:100%;border-collapse:collapse;font-size:14px}
.table th{text-align:left;color:var(--muted);font-size:12px;text-transform:uppercase;letter-spacing:.04em;padding:8px 10px;border-bottom:1px solid var(--line)}
.table td{padding:11px 10px;border-bottom:1px solid #f3f4f6;vertical-align:middle}
.table tr:last-child td{border-bottom:none}
.table .right{text-align:right;white-space:nowrap}

/* ---- Stats ---- */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-bottom:24px}
@media(max-width:680px){.stats{grid-template-columns:repeat(2,1fr)}}
.stat{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:18px 20px;display:flex;flex-direction:column;color:inherit}
.stat:hover{text-decoration:none;border-color:#dcdee2}
.stat-n{font-size:28px;font-weight:800;letter-spacing:-.02em}
.stat-l{font-size:13px;color:var(--muted)}
.stat-alert .stat-n{color:var(--red)}

/* ---- Forms layout ---- */
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.form-grid label{display:block;font-size:13px;font-weight:600;margin-bottom:5px}
.form-grid .col2{grid-column:1 / -1}
.form-grid .form-actions{grid-column:1 / -1;display:flex;gap:10px}
.row-form{display:flex;gap:10px;align-items:center}
.actions-row{display:flex;gap:10px;flex-wrap:wrap}
.filters{display:flex;gap:8px;margin-bottom:14px;flex-wrap:wrap}
.chip{padding:6px 14px;border-radius:20px;background:#fff;border:1px solid var(--line);color:var(--muted);font-size:13px;font-weight:600}
.chip.on{background:var(--ink);color:#fff;border-color:var(--ink)}

/* ---- Checklist ---- */
.checklist{display:flex;flex-direction:column;gap:8px;margin:10px 0 16px}
.check{display:flex;align-items:center;gap:10px;padding:9px 12px;border:1px solid var(--line);border-radius:10px;cursor:pointer}
.check input{width:auto}

/* ---- Lessons (course view) ---- */
.course-head{margin-bottom:22px}
.course-head .badge{margin-right:6px}
.lessons{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:14px}
.lesson{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:18px 20px}
.lesson.done{border-color:#cfe9d8}
.lesson-head{display:flex;align-items:center;gap:14px}
.lesson-num{flex:none;width:30px;height:30px;border-radius:50%;background:var(--ink);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:14px}
.lesson-num.small{width:24px;height:24px;font-size:12px}
.lesson.done .lesson-num{background:var(--ok)}
.lesson-title{flex:1}
.lesson-type{display:block;font-size:12px;color:var(--muted)}
.lesson-body{margin-top:14px}
.lesson-text{margin-top:12px;font-size:14px;color:#333}
.video{position:relative;padding-top:56.25%;border-radius:12px;overflow:hidden;background:#000}
.video iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.contenido{border:1px solid var(--line);border-radius:12px;padding:6px 14px;margin-bottom:10px}
.contenido summary{cursor:pointer;padding:8px 0;font-weight:600;display:flex;align-items:center;gap:10px}
.contenido[open]{padding-bottom:16px}
.contenido .form-grid{margin-top:8px}

/* ---- Alerts / misc ---- */
.alert{padding:12px 15px;border-radius:10px;font-size:14px;margin-bottom:14px;border:1px solid transparent}
.alert.ok,.alert.success{background:var(--okbg);border-color:#bfe6cd;color:#15803d}
.alert.err,.alert.error{background:var(--errbg);border-color:#f0c2c2;color:#b91c1c}
.alert.warn{background:var(--warnbg);border-color:#f3e0b3;color:#92660a}
.empty{background:var(--card);border:1px dashed #d6d9de;border-radius:var(--radius);padding:40px;text-align:center;color:var(--muted)}
.foot{border-top:1px solid var(--line);background:#fff}
.foot-in{max-width:1080px;margin:0 auto;padding:18px 20px;color:var(--muted);font-size:13px}