:root{--bg:#0e1116;--panel:#161b22;--line:#2a313c;--txt:#e6edf3;--dim:#8b98a5;--accent:#4aa3ff;--ok:#2ea043;--bad:#e5534b}
*{box-sizing:border-box;-webkit-user-select:none;user-select:none}
html,body{margin:0;height:100%}
body{font-family:system-ui,Segoe UI,Roboto,Arial,sans-serif;background:var(--bg);color:var(--txt);min-height:100vh}
input{user-select:text;-webkit-user-select:text}
a{cursor:pointer;color:var(--accent)}
/* ---- login ---- */
.auth{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:20px;background:radial-gradient(circle at 50% 0%,#18202c,#0e1116)}
.authbox{width:100%;max-width:380px;background:var(--panel);border:1px solid var(--line);border-radius:18px;padding:26px}
.authbox h1{font-size:20px;margin:0 0 2px}.authbox h1 small{color:var(--accent)}
.authbox p.sub{color:var(--dim);margin:0 0 18px;font-size:13px}
.field{margin-bottom:12px}.field label{display:block;font-size:12px;color:var(--dim);margin-bottom:4px}
.field input{width:100%;background:#0c1017;border:1px solid var(--line);border-radius:10px;padding:11px 13px;color:var(--txt);font-size:15px}
.field input:focus{outline:none;border-color:var(--accent)}
.btn{background:var(--accent);color:#04121f;border:0;border-radius:10px;padding:12px;font-size:16px;font-weight:600;cursor:pointer;width:100%}
.btn.ghost{background:#20293a;color:var(--txt);border:1px solid var(--line)}
.btn.sm{width:auto;padding:8px 16px;font-size:14px}
.switch{text-align:center;margin-top:14px;color:var(--dim);font-size:13px}
.err{background:#2b1615;border:1px solid var(--bad);color:#ffb3ad;border-radius:8px;padding:9px 12px;font-size:13px;margin-bottom:12px;display:none}
.err.on{display:block}
.rolehint{font-size:11px;color:var(--dim);margin-top:2px}
/* ---- app shell ---- */
header{background:var(--panel);border-bottom:1px solid var(--line);display:flex;align-items:center;gap:4px;padding:0 16px;flex-wrap:wrap;position:sticky;top:0;z-index:5}
header .brand{font-weight:700;font-size:16px;padding:14px 12px 14px 0}.brand small{color:var(--accent)}
.tab{background:transparent;border:0;color:var(--dim);padding:16px 14px;cursor:pointer;font-size:14px;border-bottom:2px solid transparent}
.tab:hover{color:var(--txt)}.tab.on{color:var(--txt);border-bottom-color:var(--accent)}
.spacer{flex:1}.who{color:var(--dim);font-size:13px;margin-right:10px}
.view{max-width:1100px;margin:0 auto;padding:20px;width:100%;display:none}.view.on{display:block}
h2{font-size:20px;margin:6px 0 16px}h3{font-size:14px;color:var(--dim);text-transform:uppercase;letter-spacing:.4px}
.crumb{color:var(--dim);font-size:13px;margin-bottom:6px}
/* home figura */
.home{display:flex;gap:24px;flex-wrap:wrap}
.figpanel{flex:0 0 340px;background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:14px;text-align:center}
.figbox{position:relative;display:inline-block;max-width:100%}
.figbox img{width:100%;max-height:560px;display:block;border-radius:10px}
.hot{position:absolute;border:2px solid transparent;border-radius:10px;cursor:pointer;transition:.12s}
.hot:hover{border-color:var(--accent);background:rgba(74,163,255,.16)}
.hot .tag{position:absolute;left:50%;top:-10px;transform:translate(-50%,-100%);background:var(--accent);color:#04121f;font-size:11px;font-weight:700;padding:2px 8px;border-radius:6px;white-space:nowrap;opacity:0;transition:.12s;pointer-events:none}
.hot:hover .tag{opacity:1}
.hint{color:var(--dim);font-size:12px;margin:8px 0 0}
.reglist{flex:1;min-width:280px}
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:12px;margin-top:10px}
.card{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:14px;cursor:pointer;color:var(--txt);text-align:left;display:flex;flex-direction:column;gap:4px}
.card:hover{border-color:var(--accent)}
.card .num{width:26px;height:26px;border-radius:50%;background:#20293a;color:var(--accent);font-weight:700;display:flex;align-items:center;justify-content:center;font-size:13px}
.card .rn{font-weight:600}.card .meta{color:var(--dim);font-size:12px}
.card.study img{width:100%;height:120px;object-fit:cover;background:#000;border-radius:8px;pointer-events:none}
/* viewer */
.viewer{display:flex;gap:16px;flex-wrap:wrap}
.imgcol{flex:1;min-width:300px;background:#05070a;border:1px solid var(--line);border-radius:12px;overflow:hidden;display:flex;flex-direction:column}
.imgwrap{flex:1;min-height:360px;display:flex;align-items:center;justify-content:center;padding:8px}
.imgwrap img{max-width:100%;max-height:60vh;pointer-events:none}
.nav{display:flex;align-items:center;gap:12px;justify-content:center;padding:10px;background:var(--panel);border-top:1px solid var(--line)}
.nav button{background:#20293a;color:var(--txt);border:1px solid var(--line);border-radius:8px;padding:8px 16px;cursor:pointer}
.nav .pos{color:var(--dim);font-size:13px;min-width:90px;text-align:center}
input[type=range]{flex:1;max-width:240px;accent-color:var(--accent)}
.side{flex:0 0 320px;background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:12px 0;display:flex;flex-direction:column}
.side h3{padding:0 14px 8px;display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--line)}
.langsw button{background:#20293a;border:1px solid var(--line);color:var(--dim);border-radius:6px;padding:2px 8px;cursor:pointer;font-size:11px}
.langsw button.on{background:var(--accent);color:#04121f}
.labels{list-style:none;margin:0;padding:6px 0;overflow:auto;max-height:56vh}
.labels li{display:flex;gap:10px;padding:5px 14px;font-size:14px;border-bottom:1px solid #1b212b}
.labels .n{color:var(--accent);font-weight:700;min-width:26px;text-align:right}.labels .empty{color:var(--dim);justify-content:center}
/* quiz */
.qhead{color:var(--dim);font-size:13px;margin-bottom:10px}
.qcard{background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:22px;max-width:760px;margin:0 auto}
.bar{height:5px;background:#0c1017;border-radius:4px;overflow:hidden;margin-bottom:14px}.bar>div{height:100%;background:var(--accent)}
.qimg{width:100%;max-width:320px;display:block;margin:0 auto 14px;border-radius:10px;background:#000;pointer-events:none}
.qtext{font-size:19px;line-height:1.4;margin:0 0 16px}
.opts{display:grid;gap:10px}
.opt{text-align:left;background:#1b2330;color:var(--txt);border:1.5px solid var(--line);border-radius:10px;padding:13px 16px;font-size:16px;cursor:pointer}
.opt:hover:not(:disabled){border-color:var(--accent)}.opt.ok{border-color:var(--ok);background:#132b1d}.opt.bad{border-color:var(--bad);background:#2b1615}
.fb{display:none;margin-top:16px;padding:13px 16px;border-radius:10px;font-size:15px}
.fb.ok{background:#132b1d;border:1px solid var(--ok)}.fb.bad{background:#2b1615;border:1px solid var(--bad)}
.fb b{display:block;margin-bottom:4px}.fb .src{display:block;margin-top:8px;color:var(--dim);font-size:12px}
.qact{margin-top:16px;text-align:right}
.center{text-align:center}.big{font-size:40px;font-weight:800;margin:10px 0}.dim{color:var(--dim)}
/* tablas / profesor */
table{width:100%;border-collapse:collapse;background:var(--panel);border:1px solid var(--line);border-radius:12px;overflow:hidden}
th,td{text-align:left;padding:11px 14px;border-bottom:1px solid var(--line);font-size:14px}
th{color:var(--dim);font-weight:600;font-size:12px;text-transform:uppercase}
tr:hover td{background:#1b2330;cursor:pointer}
.pill{display:inline-block;padding:2px 9px;border-radius:20px;font-size:12px;font-weight:600}
.pill.g{background:#132b1d;color:#7ee2a0}.pill.y{background:#2c2612;color:#e6c34a}.pill.r{background:#2b1615;color:#ffb3ad}.pill.n{background:#20293a;color:var(--dim)}
.rev{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:14px 16px;margin-bottom:10px}
.rq{font-weight:600;margin-bottom:8px}.tag2{color:var(--accent);font-size:12px}
.revimg{max-height:150px;border-radius:8px;margin-bottom:8px;pointer-events:none}
.ropts{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:8px}
.ropts span{background:#1b2330;border:1px solid var(--line);border-radius:8px;padding:4px 10px;font-size:13px;color:var(--dim)}
.ropts .ans{background:#132b1d;border-color:var(--ok);color:#7ee2a0;font-weight:600}
.rsrc{color:var(--ok);font-size:13px}
.note-doc{background:#132033;border:1px solid #24405f;border-radius:10px;padding:12px 16px;margin-bottom:16px;font-size:14px;color:#bcd3ee}
.evalbox{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:16px;margin:14px 0}
.evalbox .row{display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.evalbox input,.evalbox textarea{background:#0c1017;border:1px solid var(--line);border-radius:8px;color:var(--txt);padding:9px 11px;user-select:text}
.evalbox textarea{width:100%;min-height:60px;margin-top:8px}
footer{padding:10px 16px;color:var(--dim);font-size:11px;text-align:center;border-top:1px solid var(--line)}
@media(max-width:720px){.figpanel{flex:1 1 100%}.side{flex:1 1 100%}}