:root{--primary-50:#eff6ff;--primary-100:#dbeafe;--primary-200:#bfdbfe;--primary-400:#60a5fa;--primary-500:#3b82f6;--primary-600:#2563eb;--primary-700:#1d4ed8;--primary-900:#1e3a8a;--primary-950:#172554;--ink-950:#0a0f1e;--ink-900:#0f172a;--ink-800:#1e293b;--ink-700:#334155;--ink-500:#64748b;--ink-400:#94a3b8;--ink-200:#e2e8f0;--ink-100:#f1f5f9;--ink-50:#f8fafc;--accent-warm:#fbbf24;--danger:#dc2626;--white:#fff;--font-head:"Montserrat", "Segoe UI", system-ui, sans-serif;--font-body:"Inter", "Segoe UI", system-ui, sans-serif;--radius-sm:10px;--radius-md:16px;--radius-lg:24px;--shadow-md:0 8px 24px #0f172a14;--shadow-lg:0 20px 45px #0f172a24;--shadow-glow:0 20px 60px #3b82f659;--ease:cubic-bezier(.22, 1, .36, 1)}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html{-webkit-text-size-adjust:100%}body{font-family:var(--font-body);color:var(--ink-800);background:var(--white);-webkit-font-smoothing:antialiased;line-height:1.5}img{max-width:100%;display:block}a{color:inherit;text-decoration:none}button{font:inherit;cursor:pointer;color:inherit;background:0 0;border:none}input{font:inherit}h1,h2{font-family:var(--font-head);color:var(--ink-900);letter-spacing:-.02em;line-height:1.2}.auth-shell{background:radial-gradient(circle at 15% 15%, #3b82f629, transparent 55%), radial-gradient(circle at 85% 85%, #1d4ed824, transparent 55%), var(--ink-950);justify-content:center;align-items:center;min-height:100dvh;padding:24px;display:flex}.auth-card{background:var(--white);border-radius:var(--radius-lg);width:100%;max-width:420px;box-shadow:var(--shadow-lg);padding:36px 32px}.auth-logo{font-family:var(--font-head);color:var(--ink-900);align-items:center;gap:10px;margin-bottom:28px;font-size:.95rem;font-weight:800;display:flex}.auth-logo img{border-radius:8px}.auth-card h1{margin-bottom:6px;font-size:1.7rem;font-weight:800}.auth-subtitle{color:var(--ink-500);margin-bottom:24px;font-size:.95rem}.field{margin-bottom:16px;display:block}.field span{color:var(--ink-700);margin-bottom:6px;font-size:.85rem;font-weight:600;display:block}.field input{border:1.5px solid var(--ink-200);border-radius:var(--radius-sm);width:100%;color:var(--ink-900);background:var(--ink-50);transition:border-color .15s var(--ease), background .15s var(--ease);padding:12px 14px;font-size:1rem}.field input:focus{border-color:var(--primary-500);background:var(--white);outline:none}.auth-error{color:var(--danger);border-radius:var(--radius-sm);background:#fef2f2;border:1px solid #fecaca;margin-bottom:16px;padding:10px 12px;font-size:.88rem}.btn-primary{border-radius:var(--radius-sm);background:linear-gradient(135deg, var(--primary-500), var(--primary-700));width:100%;color:var(--white);box-shadow:var(--shadow-glow);transition:transform .15s var(--ease), box-shadow .15s var(--ease);padding:13px;font-size:1rem;font-weight:700}.btn-primary:hover{transform:translateY(-1px)}.btn-primary:disabled{opacity:.7;cursor:not-allowed;transform:none}.auth-switch{text-align:center;color:var(--ink-500);margin-top:22px;font-size:.9rem}.auth-switch a{color:var(--primary-600);font-weight:600}.auth-loading{background:var(--ink-950);justify-content:center;align-items:center;min-height:100dvh;display:flex}.spinner{border:3px solid #3b82f640;border-top-color:var(--primary-400);border-radius:50%;width:36px;height:36px;animation:.8s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}.dash-shell{background:var(--ink-50);min-height:100dvh}.dash-header{background:var(--white);border-bottom:1px solid var(--ink-200);justify-content:space-between;align-items:center;padding:16px 24px;display:flex}.dash-logo{font-family:var(--font-head);color:var(--ink-900);align-items:center;gap:10px;font-size:1rem;font-weight:800;display:flex}.dash-logo img{border-radius:7px}.btn-ghost{border-radius:var(--radius-sm);border:1.5px solid var(--ink-200);color:var(--ink-700);transition:border-color .15s var(--ease), color .15s var(--ease);padding:9px 16px;font-size:.9rem;font-weight:600}.btn-ghost:hover{border-color:var(--primary-500);color:var(--primary-600)}.dash-main{max-width:720px;margin:0 auto;padding:48px 24px}.dash-main h1{margin-bottom:4px;font-size:1.9rem;font-weight:800}.dash-subtitle{color:var(--ink-500);margin-bottom:32px}.dash-card{background:var(--white);border-radius:var(--radius-lg);box-shadow:var(--shadow-md);padding:28px}.dash-card h2{margin-bottom:10px;font-size:1.25rem;font-weight:800}.dash-card p{color:var(--ink-700);margin-bottom:16px}.badge{background:var(--primary-50);color:var(--primary-700);border-radius:999px;padding:6px 14px;font-size:.8rem;font-weight:700;display:inline-block}.soon-badge{background:var(--ink-100);color:var(--ink-500)}.auth-note{color:var(--ink-500);text-align:center;margin-top:16px;font-size:.82rem;line-height:1.5}.auth-note a{color:var(--primary-600);font-weight:600}.dash-loading{color:var(--ink-500);padding:24px 0}.kpi-grid{grid-template-columns:repeat(2,1fr);gap:12px;margin:24px 0 32px;display:grid}@media (width>=640px){.kpi-grid{grid-template-columns:repeat(4,1fr)}}.kpi-card{background:var(--white);border-radius:var(--radius-md);box-shadow:var(--shadow-sm);flex-direction:column;gap:4px;padding:18px;display:flex}.kpi-card.kpi-accent{background:linear-gradient(135deg, var(--primary-500), var(--primary-700))}.kpi-card.kpi-accent .kpi-value,.kpi-card.kpi-accent .kpi-label{color:var(--white)}.kpi-value{font-family:var(--font-head);color:var(--ink-900);font-size:1.7rem;font-weight:800}.kpi-label{color:var(--ink-500);font-size:.82rem}.empty-state{text-align:center}.empty-state h2{margin-bottom:8px;font-size:1.2rem}.empty-state p{color:var(--ink-700);margin-bottom:20px}.empty-actions{flex-direction:column;gap:10px;display:flex}@media (width>=480px){.empty-actions{flex-direction:row;justify-content:center}.empty-actions .btn-primary,.empty-actions .btn-ghost{width:auto}}.course-progress-card{margin-bottom:16px}.course-progress-head{justify-content:space-between;align-items:flex-start;gap:12px;margin-bottom:14px;display:flex}.course-progress-head h2{margin-bottom:4px;font-size:1.15rem}.course-progress-head p{color:var(--ink-500);font-size:.9rem}.progress-track{background:var(--ink-100);border-radius:999px;height:8px;overflow:hidden}.progress-fill{background:linear-gradient(90deg, var(--primary-500), var(--primary-700));height:100%;transition:width .4s var(--ease);border-radius:999px}.course-progress-meta{color:var(--ink-500);margin:8px 0 16px;font-size:.85rem}.profesor-header-right{align-items:center;gap:14px;display:flex}.profesor-welcome{color:var(--ink-500);font-size:.85rem;display:none}@media (width>=640px){.profesor-welcome{display:inline}}.profesor-tabs{background:var(--white);border-bottom:1px solid var(--ink-200);gap:4px;padding:0 16px;display:flex;overflow-x:auto}@media (width>=768px){.profesor-tabs{padding:0 24px}}.profesor-tab-btn{color:var(--ink-500);white-space:nowrap;border-bottom:2px solid #0000;padding:14px 16px;font-size:.9rem;font-weight:600}.profesor-tab-btn.is-active{color:var(--primary-600);border-bottom-color:var(--primary-500)}.profesor-main h1{font-size:1.5rem}.tab-head{flex-direction:column;gap:12px;margin-bottom:20px;display:flex}@media (width>=640px){.tab-head{flex-direction:row;justify-content:space-between;align-items:flex-start}}.tab-head-actions{flex-wrap:wrap;gap:10px;display:flex}.tab-head-actions .btn-primary,.tab-head-actions .btn-ghost{width:auto}.tab-subhead{margin:28px 0 12px;font-size:1.1rem}.table-wrap{flex-direction:column;gap:10px;display:flex}.student-row,.solicitud-row{background:var(--white);border-radius:var(--radius-md);box-shadow:var(--shadow-sm);flex-direction:column;gap:10px;padding:14px 16px;display:flex}@media (width>=900px){.student-row{flex-direction:row;align-items:center}.solicitud-row{flex-direction:row;justify-content:space-between;align-items:center}.student-row-main,.student-row-courses{flex:200px}.student-row-progress{flex:160px}}.student-row-main{flex-direction:column;gap:2px;display:flex}.student-row-main span{color:var(--ink-500);font-size:.85rem}.student-row-courses{flex-wrap:wrap;align-items:flex-start;gap:6px;display:flex}.student-row-progress{flex-direction:column;gap:6px;display:flex}.student-row-progress span{color:var(--ink-500);font-size:.78rem}.student-row-actions{flex-wrap:wrap;gap:8px;display:flex}.btn-sm{width:auto;padding:7px 12px;font-size:.82rem}.btn-danger{color:var(--danger);border-color:#fecaca}.solicitud-row div p{margin-top:4px}.solicitud-row.is-resolved{opacity:.7}.solicitud-actions{gap:8px;display:flex}.cursos-admin-list{flex-direction:column;gap:16px;display:flex}.curso-admin-card{padding:20px}.curso-admin-head{flex-direction:column;gap:10px;display:flex}@media (width>=768px){.curso-admin-head{flex-direction:row;justify-content:space-between;align-items:flex-start}}.curso-admin-head h2{flex-wrap:wrap;align-items:center;gap:8px;font-size:1.05rem;display:flex}.curso-admin-head p{color:var(--ink-500);margin-top:4px;font-size:.88rem}.modulos-panel{border-top:1px solid var(--ink-100);flex-direction:column;gap:12px;margin-top:18px;padding-top:16px;display:flex}.modulo-admin-row{background:var(--ink-50);border-radius:var(--radius-sm);padding:12px 14px}.lecciones-panel{flex-direction:column;gap:8px;margin-top:12px;padding-left:4px;display:flex}.leccion-admin-row{background:var(--white);border-radius:var(--radius-sm);flex-direction:column;gap:8px;padding:10px 12px;font-size:.9rem;display:flex}@media (width>=640px){.leccion-admin-row{flex-direction:row;justify-content:space-between;align-items:center}}.json-editor{border:1.5px solid var(--ink-200);border-radius:var(--radius-sm);background:var(--ink-950);color:#d1fae5;resize:vertical;width:100%;min-height:320px;padding:12px;font-family:ui-monospace,SF Mono,Consolas,monospace;font-size:.82rem}.modal-backdrop{z-index:100;-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px);background:#0a0f1e99;justify-content:center;align-items:flex-end;padding:0;display:flex;position:fixed;inset:0}@media (width>=640px){.modal-backdrop{align-items:center;padding:20px}}.modal-card{background:var(--white);border-radius:var(--radius-lg) var(--radius-lg) 0 0;width:100%;max-width:520px;max-height:90vh;box-shadow:var(--shadow-lg);padding:24px 20px 20px;overflow-y:auto}@media (width>=640px){.modal-card{border-radius:var(--radius-lg)}}.modal-card-wide{max-width:700px}.modal-card h2{margin-bottom:14px;font-size:1.2rem}.modal-actions{justify-content:flex-end;gap:10px;margin-top:18px;display:flex}.modal-actions .btn-ghost,.modal-actions .btn-primary{width:auto}.checkbox-list{flex-direction:column;gap:8px;max-height:200px;display:flex;overflow-y:auto}.checkbox-row{align-items:center;gap:8px;font-size:.9rem;display:flex}.checkbox-row input{width:auto}.credentials-box{background:var(--ink-50);border-radius:var(--radius-sm);flex-direction:column;gap:6px;margin:14px 0;padding:14px;font-size:.9rem;display:flex}.leccion-shell{background:var(--ink-50);flex-direction:column;min-height:100dvh;display:flex}.leccion-header{background:var(--white);border-bottom:1px solid var(--ink-200);align-items:center;gap:12px;padding:14px 16px;display:flex}.leccion-menu-btn{border-radius:var(--radius-sm);border:1.5px solid var(--ink-200);width:36px;height:36px;color:var(--ink-700);flex-shrink:0;justify-content:center;align-items:center;display:flex}.leccion-menu-btn svg{width:20px;height:20px}@media (width>=1024px){.leccion-menu-btn{display:none}}.leccion-header-info{flex:1;min-width:0}.leccion-back{color:var(--primary-600);font-size:.78rem;font-weight:600}.leccion-header-info h1{white-space:nowrap;text-overflow:ellipsis;font-size:1rem;font-weight:700;overflow:hidden}.leccion-paso-count{color:var(--ink-500);white-space:nowrap;font-size:.78rem}.leccion-progress-track{background:var(--ink-100);height:4px}.leccion-progress-fill{background:linear-gradient(90deg, var(--primary-500), var(--primary-700));height:100%;transition:width .3s var(--ease)}.leccion-body{flex:1;display:flex}.leccion-sidebar{z-index:60;background:var(--white);transition:transform .25s var(--ease);flex-direction:column;max-width:300px;display:flex;position:fixed;inset:0 20% 0 0;transform:translate(-100%)}.leccion-sidebar.is-open{transform:translate(0)}.leccion-sidebar-backdrop{z-index:55;background:#0a0f1e80;position:fixed;inset:0}@media (width>=1024px){.leccion-sidebar{top:0;border-right:1px solid var(--ink-200);width:280px;max-width:none;height:calc(100dvh - 57px);position:sticky;inset:auto;transform:none}.leccion-sidebar-backdrop{display:none}}.leccion-sidebar-head{color:var(--ink-500);border-bottom:1px solid var(--ink-100);justify-content:space-between;align-items:center;padding:16px;font-size:.85rem;font-weight:700;display:flex}.leccion-sidebar-close{color:var(--ink-500);font-size:1.1rem}@media (width>=1024px){.leccion-sidebar-close{display:none}}.leccion-steps{flex:1;padding:10px;list-style:none;overflow-y:auto}.leccion-step-btn{border-radius:var(--radius-sm);width:100%;color:var(--ink-700);text-align:left;align-items:center;gap:10px;padding:10px 12px;font-size:.9rem;font-weight:600;display:flex}.leccion-step-btn.is-active{background:var(--primary-50);color:var(--primary-700)}.leccion-step-btn.is-done{color:var(--ink-500)}.leccion-step-num{background:var(--ink-100);border-radius:999px;flex-shrink:0;justify-content:center;align-items:center;width:22px;height:22px;font-size:.72rem;font-weight:700;display:flex}.leccion-step-btn.is-active .leccion-step-num{background:var(--primary-500);color:var(--white)}.leccion-step-btn.is-done .leccion-step-num{background:var(--primary-100);color:var(--primary-700)}.leccion-main{flex:1;width:100%;min-width:0;max-width:720px;margin:0 auto;padding:20px 16px 60px}@media (width>=640px){.leccion-main{padding:32px 24px 60px}}.leccion-nav{justify-content:space-between;gap:12px;margin-top:20px;display:flex}.leccion-nav .btn-ghost,.leccion-nav .btn-primary{width:auto}.paso-card{background:var(--white);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);padding:20px}@media (width>=640px){.paso-card{padding:28px}}.paso-eyebrow{text-transform:uppercase;letter-spacing:.06em;color:var(--primary-600);margin-bottom:10px;font-size:.75rem;font-weight:700;display:inline-block}.paso-titulo{margin-bottom:14px;font-size:1.15rem}.paso-text{color:var(--ink-700);margin-bottom:14px;line-height:1.6}.paso-text-sm{color:var(--ink-500);font-size:.85rem}.warmup-text{color:var(--ink-800);margin-bottom:10px;font-size:1.05rem;line-height:1.7}.warmup-text-en{color:var(--ink-500);font-size:.92rem;font-style:italic}.flashcard-grid{grid-template-columns:repeat(2,1fr);gap:12px;display:grid}@media (width>=640px){.flashcard-grid{grid-template-columns:repeat(3,1fr)}}.flashcard{perspective:1000px;height:120px}.flashcard-inner{width:100%;height:100%;transition:transform .5s var(--ease);transform-style:preserve-3d;position:relative}.flashcard.is-flipped .flashcard-inner{transform:rotateY(180deg)}.flashcard-face{backface-visibility:hidden;border-radius:var(--radius-md);text-align:center;flex-direction:column;justify-content:center;align-items:center;gap:4px;padding:14px;display:flex;position:absolute;inset:0}.flashcard-front{background:var(--primary-50);border:1.5px solid var(--primary-100)}.flashcard-back{background:var(--primary-600);color:var(--white);transform:rotateY(180deg)}.flashcard-en{font-family:var(--font-head);color:var(--primary-800);font-size:1.02rem;font-weight:700}.flashcard-hint{color:var(--primary-500);font-size:.7rem}.flashcard-es{font-size:1rem;font-weight:700}.flashcard-nota{opacity:.9;font-size:.72rem}.tabla-wrap{margin-bottom:18px;overflow-x:auto}.grammar-table{border-collapse:collapse;width:100%;font-size:.88rem}.grammar-table th,.grammar-table td{text-align:left;border-bottom:1px solid var(--ink-100);padding:10px 12px}.grammar-table th{color:var(--ink-500);text-transform:uppercase;letter-spacing:.04em;font-size:.75rem}.contracciones-block{margin-bottom:18px}.contracciones-block h4{margin-bottom:10px;font-size:.95rem}.contracciones-list{flex-wrap:wrap;gap:8px;margin-bottom:8px;display:flex}.contraccion-chip{background:var(--ink-50);border-radius:var(--radius-sm);padding:6px 10px;font-size:.82rem}.mistakes-block h4{margin-bottom:10px;font-size:.95rem}.mistake-card{border-radius:var(--radius-sm);background:#fef2f2;flex-direction:column;gap:3px;margin-bottom:8px;padding:10px 14px;font-size:.88rem;display:flex}.mistake-wrong{color:var(--danger);text-decoration:line-through}.mistake-right{color:#15803d;font-weight:700}.mistake-note{color:var(--ink-500);font-size:.8rem}.ejercicios-list{flex-direction:column;gap:14px;margin-bottom:8px;display:flex}.ejercicio-row{background:var(--ink-50);border-radius:var(--radius-sm);padding:12px 14px}.ejercicio-pregunta{margin-bottom:8px;font-size:.92rem;display:block}.ejercicio-input-row{gap:8px;display:flex}.ejercicio-input-row input{border:1.5px solid var(--ink-200);border-radius:var(--radius-sm);flex:1;padding:9px 12px;font-size:.92rem}.btn-check{background:var(--primary-600);color:var(--white);border-radius:var(--radius-sm);white-space:nowrap;padding:9px 14px;font-size:.85rem;font-weight:600}.ejercicio-feedback{margin-top:8px;font-size:.85rem;font-weight:600;display:block}.ejercicio-feedback.ok{color:#15803d}.ejercicio-feedback.mal{color:var(--danger)}.ejercicio-row.is-ok{outline:1.5px solid #86efac}.ejercicio-row.is-mal{outline:1.5px solid #fca5a5}.dialogo-chat{flex-direction:column;gap:12px;margin-bottom:8px;display:flex}.bubble-row{flex-direction:column;gap:4px;max-width:85%;display:flex}.bubble-row.bubble-bot{align-self:flex-start;align-items:flex-start}.bubble-row.bubble-user{align-self:flex-end;align-items:flex-end}.bubble-name{color:var(--ink-500);padding:0 4px;font-size:.72rem;font-weight:600}.bubble{border-radius:var(--radius-md);padding:10px 14px;font-size:.92rem;line-height:1.4}.bubble-a{background:var(--ink-100);color:var(--ink-900);border-bottom-left-radius:4px}.bubble-b{background:var(--primary-600);color:var(--white);border-bottom-right-radius:4px}.roleplay-block{border-top:1px dashed var(--ink-200);margin-top:24px;padding-top:18px}.roleplay-block h4{margin-bottom:6px;font-size:1rem}.roleplay-input-row{gap:8px;min-width:220px;display:flex}.roleplay-input-row input{border:1.5px solid var(--ink-200);border-radius:var(--radius-sm);flex:1;padding:9px 12px;font-size:.9rem}.roleplay-input-row.is-ok input{border-color:#86efac}.roleplay-input-row.is-mal input{border-color:#fca5a5}.recursos-list{flex-direction:column;gap:10px;display:flex}.recurso-item{background:var(--ink-50);border-radius:var(--radius-sm);justify-content:space-between;align-items:center;gap:12px;padding:12px 14px;display:flex}.recurso-item p{color:var(--ink-500);margin-top:2px;font-size:.82rem}.quiz-question{margin-bottom:20px}.quiz-pregunta{color:var(--ink-800);margin-bottom:10px;font-size:.95rem;font-weight:600}.quiz-opciones{flex-wrap:wrap;gap:8px;display:flex}.quiz-opcion{border-radius:var(--radius-sm);border:1.5px solid var(--ink-200);color:var(--ink-700);padding:9px 16px;font-size:.88rem;font-weight:600}.quiz-opcion.is-selected{border-color:var(--primary-500);background:var(--primary-50);color:var(--primary-700)}.quiz-opcion.is-correct{color:#15803d;background:#f0fdf4;border-color:#86efac}.quiz-opcion.is-wrong{color:var(--danger);background:#fef2f2;border-color:#fca5a5}.quiz-score{color:var(--ink-800);margin-top:16px;font-weight:700}.resumen-list{margin-bottom:20px;padding-left:4px}.resumen-list li{color:var(--ink-700);margin-bottom:8px;margin-left:18px;font-size:.92rem;list-style:outside}.can-do-list li{align-items:flex-start;gap:8px;margin-left:0;list-style:none;display:flex}.can-do-check{color:#15803d;font-weight:800}.next-step-card{background:var(--primary-50);border-radius:var(--radius-md);margin-bottom:20px;padding:14px 16px}.next-step-card p{color:var(--primary-800);margin-top:4px;font-size:.9rem}