:root{--teal:#2daea4;--teal-dark:#1f8a82;--teal-soft:#e7f6f4;--navy:#0d114a;--coral:#f26b5e;--coral-dark:#e2564a;--violet:#ab80d8;--violet-light:#ab80d8;--violet-soft:#f2eaf9;--violet-text:#6d4696;--amber:#e8a44c;--amber-dark:#d18f37;--sage:#4f9d7c;--sage-soft:#e7f4ee;--review-soft:#fbe9e2;--review-text:#a85431;--danger:#d64550;--danger-soft:#fdecec;--page-bg:#fafbfd;--text:#586892;--text-soft:#7a89ab;--border:#e4e8f0;--shadow-card:0 6px 20px -10px #0d114a2e;--shadow-cta:0 12px 18px -6px #f26b5e66}*{box-sizing:border-box;margin:0;padding:0}body{background:var(--page-bg);color:var(--text);-webkit-font-smoothing:antialiased;font-family:Montserrat,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;line-height:1.55}h1,h2,h3,h4{color:var(--navy);font-family:Montserrat,sans-serif;font-weight:700;line-height:1.2}a{color:var(--teal-dark)}.container{max-width:1320px;margin:0 auto;padding:0 1.5rem}nav{background:var(--navy);color:#fff;align-items:center;gap:1.5rem;min-height:64px;padding:0 1.5rem;display:flex}nav h1{color:#fff;letter-spacing:.2px;align-items:baseline;gap:.5rem;font-family:Montserrat,sans-serif;font-size:1.4rem;display:flex}nav h1 .brand-sub{text-transform:uppercase;letter-spacing:1.5px;color:var(--teal);opacity:1;font-family:Poppins,sans-serif;font-size:.72rem;font-weight:400}nav a{color:#fff;opacity:.92;font-family:Poppins,sans-serif;font-size:.9rem;text-decoration:none}nav a:hover{opacity:1;text-decoration:underline}nav .spacer{flex:1}nav .user{color:#ffffffe0;font-family:Poppins,sans-serif;font-size:.82rem}nav button.logout{color:#fff;cursor:pointer;background:#ffffff24;border:1px solid #ffffff8c;border-radius:8px;padding:.35rem .95rem;font-family:Poppins,sans-serif;font-size:.82rem;transition:all .15s}nav button.logout:hover{background:#ffffff47}.card{box-shadow:var(--shadow-card);background:#fff;border-radius:14px;margin-bottom:1.1rem;padding:1.6rem}.card h2{margin-bottom:.5rem;font-size:1.25rem}.card 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var(--border);background:#fff;border-radius:12px;padding:1rem 1.1rem;transition:box-shadow .15s,border-color .15s;position:relative}.course-card:hover{box-shadow:var(--shadow-card);border-color:#0000}.course-menu-btn{z-index:2;cursor:pointer;width:1.8rem;height:1.8rem;color:var(--text-soft);background:0 0;border:none;border-radius:8px;justify-content:center;align-items:center;font-size:1.15rem;line-height:1;display:flex;position:absolute;top:.5rem;right:.5rem}.course-menu-btn:hover{background:var(--teal-soft);color:var(--teal-dark)}.course-menu{z-index:3;border:1px solid var(--border);min-width:140px;box-shadow:var(--shadow-card);background:#fff;border-radius:10px;flex-direction:column;padding:.3rem;display:flex;position:absolute;top:2.3rem;right:.5rem}.course-menu button{text-align:left;cursor:pointer;width:100%;color:var(--navy);background:0 0;border:none;border-radius:7px;padding:.45rem .7rem;font-family:Montserrat,sans-serif;font-size:.85rem;display:block}.course-menu button:hover{background:var(--teal-soft)}.course-menu button.danger{color:var(--danger)}.course-menu button.danger:hover{background:var(--danger-soft)}.stat-band{background:linear-gradient(120deg, var(--navy) 0%, #241a55 55%, #3d1f66 100%);width:100%;padding:1.6rem 0 1.9rem}.stat-band .stat-row{flex-wrap:wrap;gap:1.4rem;display:flex}.stat-band .stat{color:#fff}.stat-band .stat-num{font-variant-numeric:tabular-nums;font-family:Montserrat,sans-serif;font-size:2rem;font-weight:700}.stat-band .stat-label{opacity:.72;text-transform:uppercase;letter-spacing:.08em;font-size:.78rem}.board{padding:1.8rem 0 3rem}.board-head{justify-content:space-between;align-items:center;margin-bottom:.9rem;display:flex}.board-head h2{font-size:1.05rem}.stats-bar{background:linear-gradient(120deg, var(--navy) 0%, #241a55 55%, #3d1f66 100%);box-shadow:var(--shadow-card);border-radius:18px;flex-wrap:wrap;gap:1.8rem 2.4rem;margin-bottom:1.4rem;padding:1.5rem 1.8rem;display:flex}.stats-bar .stat{min-width:100px}.stats-bar .stat-number{color:#fff;font-family:Montserrat,sans-serif;font-size:2rem;font-weight:700;line-height:1}.stats-bar .stat-label{text-transform:uppercase;letter-spacing:.09em;color:#ffffffb8;margin-top:.4rem;font-family:Poppins,sans-serif;font-size:.68rem;font-weight:500;display:block}.task-list{flex-direction:column;gap:.55rem;margin-bottom:2.2rem;display:flex}.task-card{border-left:4px solid var(--review-text);box-shadow:var(--shadow-card);background:#fff;border-radius:10px;padding:.85rem 1rem}.task-card-violet{border-left-color:var(--violet)}.task-card .task-row{flex-wrap:wrap;align-items:center;gap:1rem;display:flex}.task-cta{background:var(--navy);color:#fff;cursor:pointer;border:none;border-radius:8px;justify-content:center;align-items:center;padding:.45rem 1rem;font-family:Montserrat,sans-serif;font-size:.8rem;font-weight:600;text-decoration:none;transition:background 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.15s}.row-action:hover{background:var(--teal-soft);color:var(--teal-dark)}.row-action-danger:hover{background:var(--danger-soft);color:var(--danger)}.row-action:disabled{opacity:.45;cursor:not-allowed}.form-group{margin-bottom:1rem}.form-group label{color:var(--navy);margin-bottom:.35rem;font-size:.85rem;font-weight:600;display:block}.form-group input,.form-group textarea,.form-group select{border:1px solid var(--border);width:100%;color:var(--navy);background:#62748a0d;border-radius:9px;padding:.6rem .9rem;font-family:Montserrat,sans-serif;font-size:.95rem;transition:border-color .15s,box-shadow .15s}.form-group input::placeholder,.form-group textarea::placeholder{color:var(--text-soft)}.form-group input:focus,.form-group textarea:focus,.form-group select:focus{border-color:var(--teal);background:#fff;outline:none;box-shadow:0 0 0 3px #2daea426}.form-group textarea{resize:vertical;min-height:120px}.badge{border-radius:100px;padding:.22rem 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380px;align-items:start;gap:1.4rem;display:grid}.lesson-layout-main,.lesson-layout-side{min-width:0}.student-select-btn{color:var(--navy);border:1.5px solid var(--navy);cursor:pointer;background:#fff;border-radius:8px;padding:.4rem .9rem;font-family:Montserrat,sans-serif;font-size:.85rem;font-weight:600;transition:background .15s,color .15s}.student-select-btn:hover,.student-select-btn.active{background:var(--navy);color:#fff}.alert{border-radius:11px;margin-bottom:1rem;padding:.8rem 1.05rem;font-size:.9rem}.alert-error{background:var(--danger-soft);color:var(--danger);border:1px solid #f6c9c9}.alert-success{background:var(--teal-soft);color:var(--teal-dark);border:1px solid #bfe8e3}.alert-info{color:#2f4f86;background:#eaf1fb;border:1px solid #cfe0f6}.exercise-card{border:1px solid var(--border);box-shadow:var(--shadow-card);background:#fff;border-radius:14px;margin-bottom:.85rem;padding:1.3rem}.exercise-card.exercise-card-flat{box-shadow:none;border:none;border-bottom:1px solid var(--border);background:0 0;border-radius:0;margin-bottom:0;padding:1.3rem 0}.exercise-number{background:var(--teal-soft);color:var(--teal-dark);border-radius:100px;align-items:center;padding:.2rem .7rem;font-family:Poppins,sans-serif;font-size:.85rem;font-weight:700;display:inline-flex}.section-divider{border-top:1px solid var(--border);margin-top:1.4rem;padding-top:1.4rem}.thread-panel{background:#f4f6fb;border-radius:14px;margin-top:1.4rem;padding:1.3rem 1.4rem}.exercise-card .question{color:var(--navy);margin-bottom:.8rem;font-weight:600}.exercise-card .options{flex-direction:column;gap:.45rem;display:flex}.exercise-card .option{border:1px solid var(--border);cursor:pointer;border-radius:10px;align-items:center;gap:.6rem;padding:.55rem .85rem;font-size:.92rem;transition:all .12s;display:flex}.exercise-card .option:hover,.exercise-card .option.selected,.exercise-card .option.correct{border-color:var(--teal);background:var(--teal-soft)}.exercise-card .option.incorrect{border-color:var(--danger);background:var(--danger-soft)}.exercise-card input[type=text]{border:1px solid var(--border);width:100%;color:var(--navy);background:#62748a0d;border-radius:9px;padding:.55rem .8rem;font-family:Montserrat,sans-serif;font-size:.95rem}.exercise-card input[type=text]:focus{border-color:var(--teal);background:#fff;outline:none}.exercise-card .explanation{background:var(--teal-soft);border-left:3px solid var(--teal);color:#2f5b57;border-radius:0 8px 8px 0;margin-top:.8rem;padding:.65rem .8rem;font-size:.85rem}.audio-fragment{margin-top:.7rem}.audio-fragment .btn-audio{color:#0d114a;background:0 0;border-color:#0d114a;padding:.4rem 1.05rem;font-size:.82rem}.audio-fragment .btn-audio:hover{background:var(--teal-soft)}.audio-fragment audio{border-radius:100px;width:100%;max-width:360px;height:36px}.audio-fragment-error{color:var(--danger);align-items:center;margin-top:.4rem;font-size:.82rem;display:flex}.score-display{text-align:center;box-shadow:var(--shadow-card);background:#fff;border-radius:18px;padding:2.2rem}.score-display .score-number{color:var(--teal);font-family:Montserrat,sans-serif;font-size:4rem;font-weight:700}.score-display .score-label{color:var(--text);font-size:1.1rem}.login-wrap{background:linear-gradient(160deg, var(--teal-soft) 0%, var(--page-bg) 55%);justify-content:center;align-items:center;min-height:100vh;padding:1.5rem;display:flex}.login-box{background:#fff;border-radius:20px;width:100%;max-width:420px;padding:2.6rem;box-shadow:0 20px 50px -20px #0d114a47}.login-box h1{text-align:center;margin-bottom:.4rem;font-size:1.9rem}.login-box .brand-sub{text-align:center;text-transform:uppercase;letter-spacing:2px;color:var(--teal-dark);margin-bottom:1.6rem;font-family:Poppins,sans-serif;font-size:.72rem;font-weight:400;display:block}.tabs{border-bottom:2px solid var(--border);gap:0;margin-bottom:1.5rem;display:flex}.tab{cursor:pointer;color:var(--text-soft);background:0 0;border:none;border-bottom:2px solid #0000;margin-bottom:-2px;padding:.65rem 1.2rem;font-family:Montserrat,sans-serif;font-size:.92rem;font-weight:500}.tab.active{color:var(--teal-dark);border-bottom-color:var(--teal);font-weight:600}.spinner{border:2px solid #ffffff80;border-top-color:currentColor;border-radius:50%;width:20px;height:20px;animation:.8s linear infinite spin;display:inline-block}.btn .spinner{border-color:#fff #ffffff80 #ffffff80}@keyframes spin{to{transform:rotate(360deg)}}.matching-grid{grid-template-columns:1fr 1fr;gap:.5rem;display:grid}.matching-item{background:var(--teal-soft);color:var(--navy);border:1px solid #cfeae6;border-radius:9px;padding:.55rem .7rem;font-size:.85rem}select.match-select{border:1px solid var(--border);width:100%;color:var(--navy);background:#fff;border-radius:8px;padding:.45rem .6rem;font-family:Montserrat,sans-serif;font-size:.85rem}@media (width<=640px){.grid-2,.grid-3{grid-template-columns:1fr}.page-header{flex-direction:column;align-items:flex-start}nav{flex-wrap:wrap;gap:.8rem;padding:.7rem 1rem}}@media (width<=900px){.lesson-layout{grid-template-columns:1fr}}.modal-overlay{z-index:50;background:#0d114a73;justify-content:center;align-items:flex-start;padding:4vh 1rem;display:flex;position:fixed;inset:0;overflow-y:auto}.modal-box{background:#fff;border-radius:16px;width:100%;max-width:520px;padding:1.5rem;box-shadow:0 18px 48px #0d114a47}.modal-box h2{align-items:center;gap:.5rem;margin-bottom:.25rem;display:flex}.modal-box .modal-close{cursor:pointer;color:#9ca3af;background:0 0;border:none;margin-left:auto;padding:0 .25rem;font-size:1.4rem;line-height:1}.modal-box .modal-close:hover{color:var(--navy)}nav button.nav-action{color:#fff;cursor:pointer;background:#ffffff24;border:1px solid #ffffff8c;border-radius:8px;padding:.35rem .95rem;font-family:Poppins,sans-serif;font-size:.82rem;transition:all .15s}nav button.nav-action:hover{background:#ffffff42}