@import "https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap";:root{--primary:#6366f1;--primary-hover:#4f46e5;--primary-light:#eef2ff;--text:#334155;--text-h:#0f172a;--text-muted:#64748b;--bg:#f8fafc;--surface:#fff;--border:#e2e8f0;--card-shadow:0 4px 6px -1px #0000000d, 0 2px 4px -2px #0000000d;--correct:#10b981;--correct-bg:#ecfdf5;--correct-border:#a7f3d0;--incorrect:#ef4444;--incorrect-bg:#fef2f2;--incorrect-border:#fecaca;--teacher-bg:#fefce8;--teacher-border:#fef08a;--sans:"Inter", system-ui, -apple-system, sans-serif;font:15px/1.6 var(--sans);--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light dark;color:var(--text);background:var(--bg)}@media (prefers-color-scheme:dark){:root{--lightningcss-light: ;--lightningcss-dark:initial;--primary:#818cf8;--primary-hover:#6366f1;--primary-light:#1e1b4b;--text:#cbd5e1;--text-h:#f8fafc;--text-muted:#94a3b8;--bg:#0f172a;--surface:#1e293b;--border:#334155;--card-shadow:0 4px 6px -1px #0000004d;--correct:#34d399;--correct-bg:#064e3b;--correct-border:#047857;--incorrect:#f87171;--incorrect-bg:#7f1d1d;--incorrect-border:#991b1b;--teacher-bg:#422006;--teacher-border:#713f12}}*{box-sizing:border-box}body{background-color:var(--bg);color:var(--text);font-family:var(--sans);-webkit-font-smoothing:antialiased;margin:0}#root{flex-direction:column;min-height:100vh;display:flex}.header{background:var(--surface);border-bottom:1px solid var(--border);z-index:100;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);position:sticky;top:0}.header__inner{justify-content:space-between;align-items:center;max-width:800px;margin:0 auto;padding:14px 20px;display:flex}.header__logo{color:var(--text-h);align-items:center;gap:10px;font-size:1.15rem;font-weight:700;text-decoration:none;display:flex}.header__logo-icon{background:var(--primary);color:#fff;border-radius:8px;justify-content:center;align-items:center;width:34px;height:34px;font-size:1.1rem;display:flex}.header__nav{gap:16px;display:flex}.header__nav-link{color:var(--text-muted);border-radius:6px;padding:6px 12px;font-size:.95rem;font-weight:500;text-decoration:none;transition:all .2s}.header__nav-link:hover,.header__nav-link.active{color:var(--primary);background:var(--primary-light)}.container{flex:1;width:100%;max-width:800px;margin:0 auto;padding:24px 20px 80px}.page{flex-direction:column;gap:20px;display:flex}.page-header{flex-direction:column;gap:6px;display:flex}.page-header h1{color:var(--text-h);letter-spacing:-.02em;margin:0;font-size:1.75rem;font-weight:700}.back-link{color:var(--primary);align-items:center;gap:6px;margin-bottom:4px;font-size:.9rem;font-weight:500;text-decoration:none;display:inline-flex}.back-link:hover{text-decoration:underline}.badge{text-transform:uppercase;letter-spacing:.03em;border-radius:9999px;align-items:center;gap:4px;padding:3px 10px;font-size:.75rem;font-weight:600;display:inline-flex}.badge--type{background:var(--primary-light);color:var(--primary)}.badge--completed{background:var(--correct-bg);color:var(--correct);border:1px solid var(--correct-border)}.badge--pending{background:var(--border);color:var(--text-muted)}.lesson-grid{grid-template-columns:1fr;gap:16px;margin-top:8px;display:grid}.lesson-card{background:var(--surface);border:1px solid var(--border);color:inherit;box-shadow:var(--card-shadow);border-radius:12px;justify-content:space-between;align-items:center;padding:20px;text-decoration:none;transition:transform .15s,border-color .15s,box-shadow .15s;display:flex}.lesson-card:hover{border-color:var(--primary);transform:translateY(-2px);box-shadow:0 10px 15px -3px #6366f11a}.lesson-card__info{flex-direction:column;gap:4px;display:flex}.lesson-card__title{color:var(--text-h);font-size:1.1rem;font-weight:600}.lesson-card__meta{color:var(--text-muted);font-size:.85rem}.exercise-player{flex-direction:column;gap:32px;display:flex}.progress-bar-container{background:var(--surface);border:1px solid var(--border);box-shadow:var(--card-shadow);z-index:90;border-radius:12px;flex-direction:column;gap:10px;padding:16px 20px;display:flex;position:sticky;top:65px}.progress-bar__info{justify-content:space-between;align-items:center;font-size:.9rem;font-weight:600;display:flex}.progress-bar__title{color:var(--text-h)}.progress-bar__count{color:var(--primary)}.progress-bar__track{background:var(--border);border-radius:999px;height:8px;overflow:hidden}.progress-bar__fill{background:linear-gradient(90deg, var(--primary), #818cf8);border-radius:999px;height:100%;transition:width .3s cubic-bezier(.4,0,.2,1)}.section-nav{scrollbar-width:thin;gap:8px;margin-top:4px;padding-bottom:4px;display:flex;overflow-x:auto}.section-nav__chip{white-space:nowrap;background:var(--bg);border:1px solid var(--border);color:var(--text-muted);border-radius:999px;padding:4px 12px;font-size:.8rem;font-weight:500;text-decoration:none;transition:all .15s}.section-nav__chip:hover{border-color:var(--primary);color:var(--primary)}.grammar-notes{background:var(--primary-light);border:1px solid #6366f133;border-radius:12px;padding:20px}.grammar-notes h3{color:var(--primary);align-items:center;gap:8px;margin-top:0;margin-bottom:8px;display:flex}.lesson-section{flex-direction:column;gap:16px;scroll-margin-top:140px;display:flex}.lesson-section__header{border-bottom:2px solid var(--border);padding-bottom:8px}.lesson-section__title{color:var(--text-h);margin:0 0 4px;font-size:1.3rem;font-weight:700}.lesson-section__instructions{color:var(--text-muted);margin:0;font-size:.9rem}.passage-card{background:var(--surface);border-left:4px solid var(--primary);box-shadow:var(--card-shadow);border-radius:0 12px 12px 0;padding:16px 20px;font-size:1.02rem;line-height:1.7}.passage-card__header{text-transform:uppercase;color:var(--primary);align-items:center;gap:6px;margin-bottom:8px;font-size:.85rem;font-weight:600;display:flex}.questions{flex-direction:column;gap:20px;display:flex}.question{background:var(--surface);border:1px solid var(--border);box-shadow:var(--card-shadow);border-radius:12px;flex-direction:column;gap:14px;padding:20px;transition:border-color .2s;display:flex}.question:focus-within{border-color:var(--primary)}.question__top{justify-content:space-between;align-items:center;display:flex}.question__prompt{color:var(--text-h);margin:0;font-size:1.05rem;font-weight:600;line-height:1.5}.question__options{flex-direction:column;gap:8px;display:flex}.option{border:1px solid var(--border);cursor:pointer;border-radius:8px;align-items:center;gap:10px;padding:10px 14px;transition:background .15s;display:flex}.option:hover{background:var(--primary-light);border-color:var(--primary)}.option input{accent-color:var(--primary)}.question__input{width:100%;font:inherit;border:1px solid var(--border);background:var(--bg);color:var(--text);border-radius:8px;padding:10px 14px;transition:all .15s}.question__input:focus{border-color:var(--primary);outline:none;box-shadow:0 0 0 3px #6366f126}.teacher-comment{background:var(--teacher-bg);border:1px solid var(--teacher-border);border-radius:8px;flex-direction:column;gap:6px;padding:12px 14px;font-size:.88rem;display:flex}.teacher-comment__label{color:#854d0e;justify-content:space-between;align-items:center;font-weight:600;display:flex}.teacher-comment textarea{width:100%;font:inherit;border:1px solid var(--teacher-border);color:#451a03;resize:vertical;background:#ffffffb3;border-radius:6px;padding:8px 10px}.teacher-comment textarea:focus{border-color:#ca8a04;outline:none}.saved-indicator{color:var(--correct);align-items:center;gap:3px;font-size:.75rem;font-weight:600;display:inline-flex}.btn{font:inherit;cursor:pointer;border:1px solid #0000;border-radius:8px;justify-content:center;align-self:flex-start;align-items:center;gap:8px;padding:9px 18px;font-size:.9rem;font-weight:600;transition:all .15s;display:inline-flex}.btn--primary{background:var(--primary);color:#fff}.btn--primary:hover:not(:disabled){background:var(--primary-hover)}.btn--secondary{background:var(--bg);border-color:var(--border);color:var(--text)}.btn--secondary:hover:not(:disabled){background:var(--border)}.btn--danger{background:var(--incorrect-bg);color:var(--incorrect);border-color:var(--incorrect-border)}.btn:disabled{opacity:.5;cursor:not-allowed}.speaking-controls{flex-wrap:wrap;align-items:center;gap:12px;display:flex}.recording-status{color:var(--incorrect);align-items:center;gap:8px;font-size:.9rem;font-weight:600;display:flex}.pulse-dot{background:var(--incorrect);border-radius:50%;width:10px;height:10px;animation:1.2s infinite pulse}@keyframes pulse{0%{opacity:1;transform:scale(.95)}50%{opacity:.5;transform:scale(1.3)}to{opacity:1;transform:scale(.95)}}.feedback{border-radius:8px;flex-direction:column;gap:4px;padding:12px 14px;font-size:.9rem;font-weight:500;display:flex}.feedback--correct{background:var(--correct-bg);color:var(--correct);border:1px solid var(--correct-border)}.feedback--incorrect{background:var(--incorrect-bg);color:var(--incorrect);border:1px solid var(--incorrect-border)}.progress-table{border-collapse:separate;border-spacing:0;background:var(--surface);border:1px solid var(--border);width:100%;box-shadow:var(--card-shadow);border-radius:12px;overflow:hidden}.progress-table th{background:var(--bg);color:var(--text-muted);text-transform:uppercase;letter-spacing:.05em;text-align:left;border-bottom:1px solid var(--border);padding:12px 16px;font-size:.75rem;font-weight:600}.progress-table td{border-bottom:1px solid var(--border);padding:16px;font-size:.95rem}.progress-table tr:last-child td{border-bottom:none}.summary-card{background:var(--surface);border:2px solid var(--primary);border-radius:16px;flex-direction:column;gap:16px;margin-top:16px;padding:24px;display:flex;box-shadow:0 10px 25px -5px #6366f126}.summary-card__header{justify-content:space-between;align-items:center;display:flex}.summary-card__title{color:var(--text-h);margin:0;font-size:1.3rem}.summary-stats{grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:12px;display:grid}.stat-box{background:var(--bg);border:1px solid var(--border);text-align:center;border-radius:10px;padding:12px}.stat-box__val{color:var(--primary);font-size:1.5rem;font-weight:700}.stat-box__label{color:var(--text-muted);font-size:.8rem}