:root{--bg:#0d0c15;--bg2:#14131f;--bg3:#1c1b2e;--bg4:#22213a;--bg5:#2a2944;--bd:rgba(255,255,255,.1);--tx:#f0ecff;--tx2:#c8c4da;--tx3:#8e8ba4;--ac:#7c3aed;--ac2:#6d28d9;--acs:rgba(124,58,237,.15);--ok:#10b981;--warn:#f59e0b;--err:#ef4444;--info:#3b82f6;--f:'DM Sans',system-ui,sans-serif;--fd:'DM Serif Display',Georgia,serif;--top:50px;--side:220px;--tutor:310px}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}html,body{height:100%;overflow:hidden;background:var(--bg);color:var(--tx);font-family:var(--f);font-size:14px;-webkit-font-smoothing:antialiased}
::-webkit-scrollbar{width:5px}::-webkit-scrollbar-thumb{background:rgba(255,255,255,.1);border-radius:3px}
/* TOP */
.mu-top{height:var(--top);background:var(--bg2);border-bottom:1px solid var(--bd);display:flex;align-items:center;justify-content:space-between;padding:0 14px;position:fixed;top:0;left:0;right:0;z-index:100}
.mu-top-l,.mu-top-r{display:flex;align-items:center;gap:8px}.mu-top-c{flex:1;text-align:center}
.mu-logo{display:flex;align-items:center;gap:6px;text-decoration:none;color:var(--tx)}.mu-logo-i{width:26px;height:26px;background:var(--ac);border-radius:7px;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:13px;color:#fff}.mu-logo-t{font-weight:600;font-size:14px}.mu-sep{color:var(--tx3)}.mu-crumb{color:var(--tx2);font-size:12px}
.mu-prog-sel,.mu-lang-sel{padding:5px 8px;background:var(--bg4);border:1px solid var(--bd);border-radius:6px;color:var(--tx);font-family:var(--f);font-size:12px}.mu-prog-sel{min-width:200px;font-weight:600}.mu-prog-sel option,.mu-lang-sel option{background:var(--bg3)}
.mu-avatar{width:28px;height:28px;background:var(--acs);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:11px;font-weight:600;color:var(--ac)}
/* BUTTONS */
.mu-btn{display:inline-flex;align-items:center;gap:5px;padding:7px 12px;border-radius:6px;border:none;cursor:pointer;font-family:var(--f);font-size:12px;font-weight:500;transition:all .2s}
.mu-btn-p{background:var(--ac);color:#fff}.mu-btn-p:hover{background:var(--ac2)}.mu-btn-g{background:transparent;color:var(--tx2);border:1px solid var(--bd)}.mu-btn-g:hover{background:var(--bg5)}
.mu-btn-sm{padding:5px 9px;font-size:11px}.mu-btn-lg{padding:11px 22px;font-size:14px}.mu-badge{padding:2px 6px;border-radius:8px;font-size:9px;font-weight:600;background:var(--acs);color:var(--ac)}
/* LAYOUT */
.mu-layout{display:flex;height:calc(100vh - var(--top));margin-top:var(--top)}
/* SIDEBAR */
.mu-side{width:var(--side);min-width:var(--side);background:var(--bg2);border-right:1px solid var(--bd);display:flex;flex-direction:column;overflow-y:auto}
.mu-side-sec{padding:8px}.mu-side-sec+.mu-side-sec{border-top:1px solid var(--bd)}
.mu-side-btn{display:flex;align-items:center;gap:7px;padding:8px 10px;width:100%;background:none;border:none;color:var(--tx2);font-size:12px;font-family:var(--f);cursor:pointer;border-radius:6px;transition:all .15s;text-align:left}.mu-side-btn:hover{background:var(--bg5);color:var(--tx)}.mu-side-btn.active{background:var(--acs);color:var(--ac);font-weight:600}
.mu-side-h{font-size:9px;font-weight:600;text-transform:uppercase;letter-spacing:.06em;color:var(--tx3);padding:6px 10px}
.mu-side-item{display:flex;align-items:center;gap:6px;padding:6px 10px;font-size:11px;color:var(--tx2);cursor:pointer;border-radius:5px;border:none;background:none;width:100%;text-align:left;font-family:var(--f);transition:all .15s}.mu-side-item:hover{background:var(--bg5);color:var(--tx)}.mu-side-item.active{background:var(--acs);color:var(--ac)}
/* CENTER */
.mu-main{flex:1;overflow-y:auto;position:relative}.mu-view{display:none;height:100%;overflow-y:auto}.mu-view.active{display:block}
/* Select program */
.mu-select-program{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100%;text-align:center;padding:40px 20px}
.mu-select-program h1{font-family:var(--fd);font-size:28px;margin-bottom:6px;letter-spacing:-.01em}.mu-sp-sub{color:var(--tx2);margin-bottom:32px;font-size:15px}
.mu-sp-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,260px));gap:16px;justify-content:center;max-width:900px;width:100%}
.mu-sp-card{background:var(--bg3);border:2px solid var(--bd);border-radius:16px;padding:32px 20px 24px;cursor:pointer;transition:all .25s;text-align:center}
.mu-sp-card:hover{border-color:var(--ac);transform:translateY(-4px);box-shadow:0 12px 32px rgba(124,58,237,.15)}
.mu-sp-icon{font-size:40px;margin-bottom:14px}.mu-sp-card h3{font-size:15px;font-family:var(--fd);margin-bottom:8px;line-height:1.3;color:var(--tx)}
.mu-sp-faculty{font-size:11px;color:var(--tx2);line-height:1.5;margin-bottom:4px}.mu-sp-meta{font-size:10px;color:var(--tx3)}
/* Content area (used by submodules) */
.mu-content{padding:20px;max-width:960px;margin:0 auto}
.mu-content-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px}
.mu-content-header h2{font-family:var(--fd);font-size:20px}
.mu-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:12px}
.mu-card{background:var(--bg3);border:1px solid var(--bd);border-radius:10px;padding:16px;transition:border-color .15s;cursor:pointer}.mu-card:hover{border-color:var(--ac)}
.mu-card h3{font-size:10px;font-weight:600;text-transform:uppercase;letter-spacing:.04em;color:var(--tx3);margin-bottom:10px}
.mu-card-item{display:flex;align-items:center;gap:8px;padding:5px 0;font-size:12px;color:var(--tx2)}.mu-card-item:hover{color:var(--tx)}.mu-card-item .ico{font-size:13px}.mu-card-item .lbl{flex:1}.mu-card-item .meta{font-size:10px;color:var(--tx3)}
.mu-card-empty{color:var(--tx3);font-size:11px;font-style:italic}
/* Subject workspace */
.mu-subj-head{padding:16px 20px;border-bottom:1px solid var(--bd)}.mu-subj-head h2{font-family:var(--fd);font-size:18px;margin-bottom:4px}.mu-subj-meta{display:flex;gap:10px;font-size:11px;color:var(--tx3)}
.mu-tabs{display:flex;gap:2px;padding:8px 20px;border-bottom:1px solid var(--bd);overflow-x:auto;-webkit-overflow-scrolling:touch;scrollbar-width:none}.mu-tabs::-webkit-scrollbar{display:none}
.mu-tab{padding:6px 12px;border:none;background:none;color:var(--tx3);font-family:var(--f);font-size:12px;cursor:pointer;border-radius:6px}.mu-tab:hover{color:var(--tx);background:var(--bg5)}.mu-tab.active{color:var(--ac);background:var(--acs);font-weight:600}
.mu-tab-content{padding:16px 20px}
/* Topic */
.mu-topic{display:flex;align-items:center;gap:8px;padding:10px 12px;background:var(--bg3);border:1px solid var(--bd);border-radius:8px;margin-bottom:6px;cursor:pointer;transition:border-color .15s}.mu-topic:hover{border-color:var(--ac)}
.mu-topic-ck{width:18px;height:18px;border:2px solid var(--bd);border-radius:4px;display:flex;align-items:center;justify-content:center;font-size:11px;flex-shrink:0;cursor:pointer;transition:all .15s}.mu-topic-ck.done{background:var(--ok);border-color:var(--ok);color:#fff}
.mu-topic-t{flex:1;font-size:13px}.mu-topic-i{color:var(--tx3);font-size:10px}
/* Notes/tasks */
.mu-note-card{background:var(--bg3);border:1px solid var(--bd);border-radius:8px;padding:12px;margin-bottom:8px;cursor:pointer;transition:border-color .15s}.mu-note-card:hover{border-color:var(--ac)}.mu-note-card h4{font-size:13px;margin-bottom:3px}.mu-note-card p{font-size:11px;color:var(--tx3)}
.mu-task-item{display:flex;align-items:center;gap:10px;background:var(--bg3);border:1px solid var(--bd);border-radius:8px;padding:10px 12px;margin-bottom:6px}
.mu-task-dot{width:8px;height:8px;border-radius:50%;flex-shrink:0}.mu-task-dot.pendiente{background:var(--warn)}.mu-task-dot.completada{background:var(--ok)}.mu-task-dot.draft{background:var(--tx3)}
.mu-task-info{flex:1}.mu-task-title{font-size:12px;font-weight:600}.mu-task-due{font-size:10px;color:var(--tx3)}
/* Groups */
.mu-grp-card{background:var(--bg3);border:1px solid var(--bd);border-radius:10px;padding:14px;margin-bottom:10px;cursor:pointer;transition:border-color .15s}.mu-grp-card:hover{border-color:var(--ac)}.mu-grp-card h3{font-size:14px;margin-bottom:4px}.mu-grp-card p{font-size:11px;color:var(--tx3)}
.mu-grp-layout{display:flex;height:calc(100% - 60px)}.mu-grp-members{width:170px;border-right:1px solid var(--bd);padding:12px;overflow-y:auto}
.mu-grp-member{display:flex;align-items:center;gap:6px;padding:5px;font-size:11px;color:var(--tx2)}.mu-grp-member .dot{width:6px;height:6px;border-radius:50%;background:var(--ok)}
.mu-grp-chat{flex:1;display:flex;flex-direction:column}.mu-grp-msgs{flex:1;overflow-y:auto;padding:12px;display:flex;flex-direction:column;gap:6px}
.mu-grp-msg{max-width:80%;padding:8px 10px;border-radius:10px;font-size:12px;line-height:1.5}.mu-grp-msg.mine{align-self:flex-end;background:var(--ac);color:#fff}.mu-grp-msg.other{align-self:flex-start;background:var(--bg3);border:1px solid var(--bd)}.mu-grp-msg .author{font-size:9px;font-weight:600;margin-bottom:2px;opacity:.7}
.mu-grp-input{display:flex;gap:6px;padding:10px 12px;border-top:1px solid var(--bd)}.mu-grp-input textarea{flex:1;resize:none;padding:7px 9px;background:var(--bg4);border:1px solid var(--bd);border-radius:7px;color:var(--tx);font-family:var(--f);font-size:12px}.mu-grp-input textarea:focus{outline:none;border-color:var(--ac)}
/* Tutor */
.mu-tutor{width:var(--tutor);min-width:var(--tutor);background:var(--bg2);border-left:1px solid var(--bd);display:flex;flex-direction:column}
.mu-tutor-head{display:flex;align-items:center;gap:9px;padding:10px 12px;border-bottom:1px solid var(--bd)}.mu-tutor-head>span:first-child{font-size:18px}.mu-tutor-t{font-size:12px;font-weight:600}.mu-tutor-s{font-size:9px;color:var(--tx3)}
.mu-tutor-msgs{flex:1;overflow-y:auto;padding:12px;display:flex;flex-direction:column;gap:8px}
.mu-tutor-msg{padding:8px 10px;border-radius:8px;font-size:12px;line-height:1.5;max-width:95%}.mu-tutor-msg.user{align-self:flex-end;background:var(--ac);color:#fff}.mu-tutor-msg.assistant{align-self:flex-start;background:var(--bg3);border:1px solid var(--bd);color:var(--tx2)}
.mu-tutor-input{display:flex;gap:6px;padding:10px 12px;border-top:1px solid var(--bd)}.mu-tutor-input textarea{flex:1;resize:none;padding:7px 9px;background:var(--bg4);border:1px solid var(--bd);border-radius:7px;color:var(--tx);font-family:var(--f);font-size:11px;max-height:60px}.mu-tutor-input textarea:focus{outline:none;border-color:var(--ac)}
/* Modal */
.mu-modal-bg{position:fixed;inset:0;background:rgba(0,0,0,.6);z-index:200;display:flex;align-items:center;justify-content:center}.mu-modal{background:var(--bg3);border:1px solid var(--bd);border-radius:10px;padding:24px;max-width:440px;width:90%}
.mu-modal h2{font-family:var(--fd);font-size:18px;margin-bottom:16px}.mu-fg{margin-bottom:12px}.mu-fg label{display:block;font-size:11px;font-weight:600;color:var(--tx2);margin-bottom:4px;text-transform:uppercase}
.mu-fg input,.mu-fg select,.mu-fg textarea{width:100%;padding:8px 10px;background:var(--bg4);border:1px solid var(--bd);border-radius:6px;color:var(--tx);font-family:var(--f);font-size:13px}.mu-fg input:focus,.mu-fg select:focus,.mu-fg textarea:focus{outline:none;border-color:var(--ac)}
.mu-fa{display:flex;gap:8px;justify-content:flex-end;margin-top:16px}
@media(max-width:1024px){:root{--side:190px;--tutor:270px}}
@media(max-width:768px){.mu-side,.mu-tutor{display:none}.mu-grid{grid-template-columns:1fr}.mu-grp-members{display:none}}
/* Tools launcher */
.mu-tools-bar{padding:8px 12px;border-top:1px solid var(--bd);background:var(--bg2)}
.mu-tools-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:4px}
.mu-tool-btn{display:flex;flex-direction:column;align-items:center;gap:2px;padding:8px 4px;background:var(--bg4);border:1px solid var(--bd);border-radius:8px;color:var(--tx2);font-size:10px;font-family:var(--f);font-weight:600;cursor:pointer;transition:all .15s}
.mu-tool-btn:hover{background:var(--bg5);color:var(--tx);border-color:var(--ac)}
.mu-tool-btn span{font-size:16px}
.mu-tool-toggle{background:none;border:none;color:var(--ac);font-size:18px;cursor:pointer;padding:4px 8px;border-radius:6px;transition:all .15s}
.mu-tool-toggle:hover{background:var(--acs)}
.mu-tool-toggle.active{background:var(--acs);color:#fff}
.mu-tutor-input{display:flex;align-items:end;gap:4px;padding:8px 10px;border-top:1px solid var(--bd);background:var(--bg2)}

/* ── Submodule universal ── */
.mu-year-block{margin-bottom:1.4rem}
.mu-year-block h3{font-size:.8rem;font-weight:700;color:var(--tx2);text-transform:uppercase;letter-spacing:.06em;margin-bottom:.6rem;padding-bottom:.4rem;border-bottom:1px solid var(--bd)}
.mu-subject-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:.6rem}
.mu-subject-card{background:var(--bg3);border:1px solid var(--bd);border-radius:10px;padding:1rem .9rem;text-align:left;cursor:pointer;transition:all .15s;display:flex;flex-direction:column;gap:.3rem}
.mu-subject-card:hover{border-color:var(--ac);transform:translateY(-1px);box-shadow:0 4px 12px rgba(0,0,0,.15)}
.mu-subj-name{font-size:.88rem;font-weight:700;color:var(--tx);line-height:1.3}
.mu-subj-ects{font-size:.72rem;color:var(--ac);font-weight:700}
.mu-subj-sem{font-size:.68rem;color:var(--tx2)}
/* Topics */
.mu-topics-list{display:flex;flex-direction:column;gap:.4rem}
.mu-topic-row{display:flex;align-items:center;gap:.8rem;padding:.7rem 1rem;background:var(--bg3);border:1px solid var(--bd);border-radius:8px;cursor:pointer;transition:all .15s}
.mu-topic-row:hover{border-color:var(--ac);background:var(--bg4)}
.mu-topic-num{font-size:.72rem;font-weight:800;color:var(--ac);min-width:24px}
.mu-topic-title{flex:1;font-size:.88rem;color:var(--tx)}
.mu-topic-arrow{color:var(--tx2);font-size:.9rem}
/* Practice */
.mu-practice-loading{text-align:center;padding:2rem;color:var(--tx2);font-size:.9rem}
.mu-practice-error{text-align:center;padding:1.5rem;color:#ef4444;font-size:.85rem}
.mu-exercise-card{background:var(--bg3);border:1px solid var(--bd);border-radius:12px;padding:1.2rem}
.mu-exercise-q{font-size:.95rem;font-weight:600;color:var(--tx);margin-bottom:1rem;line-height:1.5}
.mu-exercise-opts{display:flex;flex-direction:column;gap:.5rem;margin-bottom:1rem}
.mu-opt{background:var(--bg4);border:1px solid var(--bd);border-radius:8px;padding:.7rem 1rem;text-align:left;cursor:pointer;font-size:.85rem;color:var(--tx);transition:all .15s}
.mu-opt:hover{border-color:var(--ac);background:var(--bg5)}
.mu-opt.selected{border-color:var(--ac);background:var(--acs);color:#fff}
.mu-exercise-input{width:100%;background:var(--bg4);border:1px solid var(--bd);border-radius:8px;padding:.8rem;color:var(--tx);font-family:var(--f);font-size:.85rem;resize:vertical;margin-bottom:.8rem}
.mu-exercise-feedback{margin-top:1rem;padding:.8rem 1rem;border-radius:8px;font-size:.85rem;line-height:1.5}
.mu-exercise-feedback.correct{background:#d1fae5;border:1px solid #6ee7b7;color:#065f46}
.mu-exercise-feedback.incorrect{background:#fee2e2;border:1px solid #fca5a5;color:#991b1b}
/* Dashboard */
.mu-dashboard-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:.8rem;margin-bottom:1.2rem}
.mu-dash-card{background:var(--bg3);border:1px solid var(--bd);border-radius:10px;padding:1rem;text-align:center;display:flex;flex-direction:column;gap:.4rem}
.mu-dash-card.mu-dash-xp{border-color:var(--ac)}
.mu-dash-num{font-size:1.6rem;font-weight:900;color:var(--ac)}
.mu-dash-label{font-size:.72rem;color:var(--tx2);font-weight:600;text-transform:uppercase}
.mu-progress-list{display:flex;flex-direction:column;gap:.6rem}
.mu-prog-row{display:flex;align-items:center;gap:.8rem}
.mu-prog-name{flex:0 0 150px;font-size:.82rem;color:var(--tx);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.mu-prog-bar-wrap{flex:1;height:8px;background:var(--bg4);border-radius:4px;overflow:hidden}
.mu-prog-bar{height:100%;border-radius:4px;transition:width .4s}
.mu-prog-score{flex:0 0 48px;font-size:.78rem;font-weight:700;color:var(--tx2);text-align:right}
/* Back button */
.mu-back{background:none;border:none;color:var(--ac);font-size:.85rem;font-weight:600;cursor:pointer;padding:.3rem .5rem;border-radius:6px}
.mu-back:hover{background:var(--acs);color:#fff}