/* ===== QuemaSim · styles.css ===== */
:root{
  --bg:#0f1720; --panel:#161f2b; --panel2:#1d2836; --line:#2a3848;
  --txt:#e8edf3; --muted:#9fb0c3; --accent:#ff6b35; --accent2:#ffa94d;
  --ok:#36c98d; --warn:#f4c152; --bad:#ef5b6b; --info:#4aa8ff;
  --parcial:#f4a23b; --total:#c0392b;
  --radius:14px; --shadow:0 6px 22px rgba(0,0,0,.28);
  font-synthesis:none;
}
*{box-sizing:border-box}
html,body{margin:0;height:100%}
body{
  background:linear-gradient(160deg,#0c131b,#101a26 60%,#0c1119);
  color:var(--txt);
  font-family:"Segoe UI",system-ui,-apple-system,Roboto,Helvetica,Arial,sans-serif;
  display:flex;flex-direction:column;min-height:100vh;font-size:15px;line-height:1.5;
}

/* Topbar */
.topbar{display:flex;align-items:center;justify-content:space-between;
  padding:12px 20px;background:rgba(13,20,28,.85);border-bottom:1px solid var(--line);
  backdrop-filter:blur(6px)}
.sticky-head{position:sticky;top:0;z-index:20}
.brand{display:flex;align-items:center;gap:12px}
.logo{font-size:30px;filter:drop-shadow(0 0 8px rgba(255,107,53,.5))}
.brand h1{margin:0;font-size:20px;letter-spacing:.5px}
.tagline{margin:0;color:var(--muted);font-size:12px}
.user-chip{display:flex;align-items:center;gap:8px;background:var(--panel2);
  border:1px solid var(--line);border-radius:999px;padding:5px 8px 5px 14px;font-size:13px}
.ghost-btn{background:transparent;border:none;color:var(--muted);cursor:pointer;font-size:15px}
.ghost-btn:hover{color:var(--txt)}

/* Tabs */
.tabs{display:flex;gap:4px;padding:8px 14px;overflow-x:auto;
  background:rgba(13,20,28,.6);border-bottom:1px solid var(--line)}
.tab{white-space:nowrap;background:transparent;border:1px solid transparent;color:var(--muted);
  padding:8px 14px;border-radius:10px;cursor:pointer;font-size:13.5px;font-weight:600}
.tab:hover{color:var(--txt);background:var(--panel)}
.tab.active{color:#fff;background:linear-gradient(135deg,var(--accent),var(--accent2));
  box-shadow:0 3px 12px rgba(255,107,53,.35)}

/* Responsive (móvil): pestañas siempre visibles, sin scroll que esconda el menú */
@media (max-width:640px){
  .topbar{padding:10px 12px}
  .tagline{display:none}
  .brand h1{font-size:18px}
  .logo{font-size:24px}
  .tabs{flex-wrap:wrap;gap:6px;padding:8px 10px;overflow-x:visible}
  .tab{flex:1 1 auto;text-align:center;padding:8px 9px;font-size:12px}
  main{padding:16px 12px 36px}
  .card{padding:14px}
  .scq-readout{font-size:34px}
}

/* Layout */
main{flex:1;max-width:1080px;width:100%;margin:0 auto;padding:22px 18px 40px}
.foot{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;
  padding:10px 20px;border-top:1px solid var(--line);color:var(--muted);font-size:11.5px;background:rgba(13,20,28,.7)}

/* Cards */
.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);
  padding:18px;margin-bottom:16px;box-shadow:var(--shadow)}
.card h2{margin:0 0 4px;font-size:18px}
.card h3{margin:14px 0 6px;font-size:15px;color:var(--accent2)}
.grid{display:grid;gap:14px}
.grid.cols2{grid-template-columns:repeat(auto-fit,minmax(280px,1fr))}
.grid.cols3{grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}
.muted{color:var(--muted)}
.pill{display:inline-block;padding:2px 9px;border-radius:999px;font-size:11.5px;
  background:var(--panel2);border:1px solid var(--line);color:var(--muted)}
.pill.ok{color:var(--ok);border-color:rgba(54,201,141,.4)}
.pill.warn{color:var(--warn);border-color:rgba(244,193,82,.4)}

/* Buttons */
.btn{background:linear-gradient(135deg,var(--accent),var(--accent2));color:#fff;border:none;
  padding:10px 16px;border-radius:10px;font-weight:700;cursor:pointer;font-size:14px}
.btn:hover{filter:brightness(1.08)}
.btn.sec{background:var(--panel2);border:1px solid var(--line);color:var(--txt)}
.btn.sm{padding:6px 11px;font-size:12.5px}
.btn:disabled{opacity:.5;cursor:not-allowed}

/* Lessons */
.lesson-item{border:1px solid var(--line);border-radius:12px;margin-bottom:10px;overflow:hidden;background:var(--panel2)}
.lesson-head{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:14px 16px;cursor:pointer}
.lesson-head:hover{background:#22303f}
.lesson-body{padding:0 16px;max-height:0;overflow:hidden;transition:max-height .3s ease,padding .3s ease}
.lesson-item.open .lesson-body{max-height:1400px;padding:6px 16px 16px}
.lesson-block{padding:10px 0;border-top:1px dashed var(--line)}
.lesson-block b{color:var(--accent2)}
.chev{transition:transform .25s}
.lesson-item.open .chev{transform:rotate(90deg)}

/* SCQ tool */
.scq-wrap{display:grid;grid-template-columns:1fr 320px;gap:18px}
@media(max-width:820px){.scq-wrap{grid-template-columns:1fr}}
.bodies{display:flex;gap:10px;justify-content:center;background:#0c1320;border:1px solid var(--line);border-radius:12px;padding:10px}
.body-col{text-align:center}
.body-col small{color:var(--muted)}
.region{cursor:pointer;stroke:#3a4a5c;stroke-width:1.5;fill:#26475f;transition:fill .15s}
.region:hover{stroke:var(--accent2);stroke-width:2.2}
.region.parcial{fill:var(--parcial)}
.region.total{fill:var(--total)}
.scq-readout{font-size:40px;font-weight:800;color:var(--accent2);line-height:1}
.legend{display:flex;gap:14px;flex-wrap:wrap;margin-top:8px;font-size:12.5px}
.swatch{display:inline-block;width:13px;height:13px;border-radius:3px;vertical-align:-1px;margin-right:5px;border:1px solid var(--line)}
.field{display:flex;flex-direction:column;gap:4px;margin-bottom:12px}
.field label{font-size:12.5px;color:var(--muted)}
.field input,.field select,.field textarea{background:#0c1320;border:1px solid var(--line);color:var(--txt);
  border-radius:9px;padding:9px 11px;font-size:14px;font-family:inherit}
.field textarea{min-height:120px;resize:vertical}
.result-line{display:flex;justify-content:space-between;padding:7px 0;border-bottom:1px dashed var(--line)}
.result-line b{color:var(--accent2)}
.big{font-size:18px}

/* Cases */
.case-card{cursor:pointer;transition:transform .12s,border-color .12s}
.case-card:hover{transform:translateY(-2px);border-color:var(--accent)}
.node-txt{font-size:15.5px;margin:6px 0 14px}
.opt{display:block;width:100%;text-align:left;background:var(--panel2);border:1px solid var(--line);
  color:var(--txt);padding:13px 15px;border-radius:11px;margin-bottom:9px;cursor:pointer;font-size:14px}
.opt:hover{border-color:var(--accent2);background:#22303f}
.opt.correct{border-color:var(--ok);background:rgba(54,201,141,.12)}
.opt.wrong{border-color:var(--bad);background:rgba(239,91,107,.12)}
.feedback{border-left:3px solid var(--info);background:rgba(74,168,255,.08);padding:11px 14px;border-radius:0 10px 10px 0;margin:10px 0}
.feedback.good{border-color:var(--ok);background:rgba(54,201,141,.08)}
.feedback.bad{border-color:var(--bad);background:rgba(239,91,107,.08)}

/* Quiz */
.progress-bar{height:10px;background:#0c1320;border-radius:999px;overflow:hidden;border:1px solid var(--line)}
.progress-bar>span{display:block;height:100%;background:linear-gradient(90deg,var(--accent),var(--accent2))}
.comp-row{display:flex;align-items:center;gap:12px;margin-bottom:11px}
.comp-row .name{width:170px;font-size:13.5px}
.comp-row .bar{flex:1;height:14px;background:#0c1320;border-radius:999px;overflow:hidden;border:1px solid var(--line)}
.comp-row .bar>span{display:block;height:100%}
.comp-row .pct{width:46px;text-align:right;font-weight:700;font-size:13px}

/* Tutor */
.tutor-score{font-size:34px;font-weight:800}
.concept-ok{color:var(--ok)}
.concept-miss{color:var(--warn)}
.kpill{display:inline-block;margin:3px;padding:4px 10px;border-radius:999px;font-size:12px;border:1px solid var(--line)}

/* Table */
table{width:100%;border-collapse:collapse;font-size:13.5px}
th,td{text-align:left;padding:9px 10px;border-bottom:1px solid var(--line)}
th{color:var(--muted);font-weight:600;font-size:12px;text-transform:uppercase;letter-spacing:.4px}
tr:hover td{background:var(--panel2)}

/* Toast */
.toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%) translateY(40px);
  background:var(--panel2);border:1px solid var(--line);color:var(--txt);padding:11px 18px;
  border-radius:10px;box-shadow:var(--shadow);opacity:0;transition:.3s;pointer-events:none;z-index:50}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}

.hero{background:linear-gradient(135deg,rgba(255,107,53,.16),rgba(74,168,255,.08));
  border:1px solid var(--line);border-radius:var(--radius);padding:22px;margin-bottom:18px}
.hero h2{margin:0 0 6px;font-size:22px}
.steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:10px;margin-top:14px}
.step{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:13px}
.step .n{display:inline-flex;width:26px;height:26px;align-items:center;justify-content:center;
  border-radius:8px;background:linear-gradient(135deg,var(--accent),var(--accent2));color:#fff;font-weight:800;font-size:13px;margin-bottom:8px}
.codebox{width:100%;font-family:Consolas,monospace;font-size:12px;background:#0c1320;border:1px solid var(--line);
  color:var(--ok);border-radius:9px;padding:10px;min-height:70px;resize:vertical;word-break:break-all}
.badge{font-size:11px;padding:2px 8px;border-radius:6px;background:var(--panel2);border:1px solid var(--line)}
.dot{width:9px;height:9px;border-radius:50%;display:inline-block;margin-right:6px}