:root{font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,"Apple Color Emoji","Segoe UI Emoji";line-height:1.5;font-weight:400;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-synthesis:none;color-scheme:light dark;--bg: #0b1020;--bg-elev-1: #0f1730;--bg-elev-2: #131e3d;--panel: rgba(255, 255, 255, .06);--panel-strong: rgba(255, 255, 255, .1);--text: rgba(255, 255, 255, .92);--muted: rgba(255, 255, 255, .65);--faint: rgba(255, 255, 255, .45);--border: rgba(255, 255, 255, .12);--shadow: 0 10px 35px rgba(0, 0, 0, .35);--primary: #7c5cff;--primary-2: #22c55e;--danger: #ef4444;--warning: #f59e0b;--radius: 14px;--radius-sm: 10px;--ring: 0 0 0 3px rgba(124, 92, 255, .35);--space-1: 6px;--space-2: 10px;--space-3: 14px;--space-4: 18px;--space-5: 24px;--space-6: 32px}@media(prefers-color-scheme:light){:root{--bg: #f6f7fb;--bg-elev-1: #ffffff;--bg-elev-2: #ffffff;--panel: rgba(15, 23, 42, .04);--panel-strong: rgba(15, 23, 42, .06);--text: rgba(15, 23, 42, .92);--muted: rgba(15, 23, 42, .65);--faint: rgba(15, 23, 42, .5);--border: rgba(15, 23, 42, .12);--shadow: 0 10px 35px rgba(2, 6, 23, .12)}}*{box-sizing:border-box}html,body{height:100%}body{margin:0;min-width:320px;min-height:100vh;background:radial-gradient(1200px 600px at 10% 0%,rgba(124,92,255,.25),transparent 55%),radial-gradient(1000px 500px at 100% 0%,rgba(34,197,94,.16),transparent 55%),var(--bg);color:var(--text)}#root{min-height:100vh}a{color:inherit;text-decoration:none}a:hover{text-decoration:underline;text-decoration-color:#7c5cff8c;text-underline-offset:3px}:focus-visible{outline:none;box-shadow:var(--ring);border-radius:10px}button,input,textarea{font:inherit;color:inherit}input,textarea{width:100%;border:1px solid var(--border);background:color-mix(in srgb,var(--bg-elev-1) 85%,transparent);padding:10px 12px;border-radius:12px}input::placeholder,textarea::placeholder{color:var(--faint)}label{display:block;font-size:.9rem;color:var(--muted);margin-bottom:6px}.srOnly{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.appShell{min-height:100vh;display:grid;grid-template-columns:1fr}.topbar{position:sticky;top:0;z-index:20;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);background:color-mix(in srgb,var(--bg-elev-1) 72%,transparent);border-bottom:1px solid var(--border)}.topbarInner{display:flex;align-items:center;justify-content:space-between;gap:var(--space-3);padding:14px var(--space-4);max-width:1200px;margin:0 auto}.brand{display:flex;align-items:center;gap:10px;min-width:0}.brandMark{width:34px;height:34px;border-radius:12px;background:radial-gradient(circle at 30% 30%,rgba(255,255,255,.25),transparent 55%),linear-gradient(135deg,#7c5cfff2,#22c55ebf);box-shadow:0 10px 30px #7c5cff40;border:1px solid rgba(255,255,255,.16)}.brandTitle{font-weight:650;letter-spacing:-.02em;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.topbarActions{display:flex;align-items:center;gap:10px}.iconBtn{display:inline-flex;align-items:center;justify-content:center;width:40px;height:40px;border-radius:12px;border:1px solid var(--border);background:color-mix(in srgb,var(--bg-elev-1) 80%,transparent);cursor:pointer}.iconBtn:hover{border-color:color-mix(in srgb,var(--primary) 55%,var(--border));background:color-mix(in srgb,var(--bg-elev-2) 78%,transparent)}.userChip{display:none;align-items:center;gap:10px;padding:8px 10px;border-radius:999px;border:1px solid var(--border);background:color-mix(in srgb,var(--bg-elev-1) 80%,transparent);max-width:420px;min-width:0}.avatar{width:28px;height:28px;border-radius:999px;display:grid;place-items:center;font-size:.78rem;font-weight:700;color:#ffffffe6;background:linear-gradient(135deg,#7c5cfff2,#38bdf8bf)}.userEmail{color:var(--muted);font-size:.92rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.layoutBody{display:grid;grid-template-columns:1fr;max-width:1200px;margin:0 auto;width:100%}.sidebar{display:none;border-right:1px solid var(--border);background:color-mix(in srgb,var(--bg-elev-1) 78%,transparent)}.sidebarInner{position:sticky;top:68px;padding:var(--space-5) var(--space-3);height:calc(100vh - 68px);overflow:auto}.navGroupTitle{font-size:.78rem;letter-spacing:.08em;text-transform:uppercase;color:var(--faint);margin:0 10px 10px}.navList{list-style:none;padding:0;margin:0 0 var(--space-5);display:grid;gap:6px}.navLink{display:flex;align-items:center;gap:10px;padding:10px 12px;border-radius:12px;border:1px solid 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var(--border);box-shadow:var(--shadow);display:grid;grid-template-rows:auto 1fr auto}.drawerOpen{transform:translate(0)}.drawerHeader{padding:var(--space-4);border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;gap:var(--space-3)}.drawerBody{padding:var(--space-4);overflow:auto}.drawerFooter{padding:var(--space-4);border-top:1px solid var(--border)}.pageHeader{display:flex;align-items:flex-start;justify-content:space-between;gap:var(--space-4);margin-bottom:var(--space-5)}.h1{margin:0;font-size:clamp(1.55rem,1.2rem + 1vw,2.1rem);letter-spacing:-.02em;line-height:1.15}.subtle{margin:8px 0 0;color:var(--muted)}.card{border:1px solid var(--border);background:color-mix(in srgb,var(--bg-elev-1) 80%,transparent);border-radius:var(--radius);box-shadow:0 1px #ffffff0a}.cardPad{padding:var(--space-5)}.gridCards{display:grid;grid-template-columns:1fr;gap:var(--space-4)}.courseTitle{margin:0;font-size:1.05rem;letter-spacing:-.01em}.courseDesc{margin:10px 0 0;color:var(--muted)}.cardFooter{margin-top:var(--space-4);display:flex;align-items:center;justify-content:space-between;gap:var(--space-3);flex-wrap:wrap}.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;border-radius:12px;padding:10px 12px;border:1px solid var(--border);background:color-mix(in srgb,var(--bg-elev-2) 72%,transparent);cursor:pointer;text-decoration:none;-webkit-user-select:none;user-select:none}.btn:hover{text-decoration:none;border-color:color-mix(in srgb,var(--primary) 55%,var(--border));background:color-mix(in srgb,var(--primary) 14%,transparent)}.btnPrimary{border-color:color-mix(in srgb,var(--primary) 68%,var(--border));background:linear-gradient(135deg,color-mix(in srgb,var(--primary) 78%,transparent),color-mix(in srgb,var(--primary) 38%,transparent))}.btnPrimary:hover{background:linear-gradient(135deg,color-mix(in srgb,var(--primary) 88%,transparent),color-mix(in srgb,var(--primary) 46%,transparent))}.btnDanger{border-color:color-mix(in srgb,var(--danger) 60%,var(--border))}.btn:disabled,.btn[aria-disabled=true],button:disabled{opacity:.55;cursor:not-allowed}.badge{display:inline-flex;align-items:center;gap:8px;padding:6px 10px;border-radius:999px;border:1px solid var(--border);font-size:.85rem;color:var(--muted);background:color-mix(in srgb,var(--bg-elev-2) 70%,transparent)}.badgeSuccess{border-color:color-mix(in srgb,var(--primary-2) 55%,var(--border));background:color-mix(in srgb,var(--primary-2) 18%,transparent);color:color-mix(in srgb,var(--primary-2) 80%,var(--text))}.badgeWarn{border-color:color-mix(in srgb,var(--warning) 55%,var(--border));background:color-mix(in srgb,var(--warning) 18%,transparent);color:color-mix(in srgb,var(--warning) 85%,var(--text))}.alert{border-radius:var(--radius);border:1px solid var(--border);padding:12px 14px;background:color-mix(in srgb,var(--bg-elev-2) 70%,transparent);color:var(--text)}.alertError{border-color:color-mix(in srgb,var(--danger) 55%,var(--border));background:color-mix(in srgb,var(--danger) 12%,transparent)}.kicker{font-size:.9rem;color:var(--muted);margin-top:6px}.authShell{min-height:100vh;display:grid;place-items:center;padding:var(--space-6) var(--space-4)}.authCard{width:100%;max-width:520px}.formRow{display:grid;gap:10px;margin-top:var(--space-4)}.formActions{margin-top:var(--space-4);display:flex;gap:10px;align-items:center;justify-content:space-between;flex-wrap:wrap}@media(min-width:960px){.userChip{display:inline-flex}.layoutBody{grid-template-columns:280px 1fr}.sidebar{display:block}.content{padding:var(--space-6) var(--space-5) var(--space-6)}.gridCards{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(min-width:1180px){.gridCards{grid-template-columns:repeat(3,minmax(0,1fr))}}.breadcrumb{display:flex;align-items:center;gap:var(--space-3);font-size:.9rem;color:var(--muted)}.lessonSection{border:1px solid var(--border);background:color-mix(in srgb,var(--bg-elev-1) 80%,transparent);border-radius:var(--radius);padding:var(--space-5);margin-bottom:var(--space-5)}.lessonSectionTitle{margin:0 0 var(--space-4);font-size:1.1rem;letter-spacing:-.01em}.lessonSectionToggle{width:100%;display:flex;align-items:center;justify-content:space-between;background:transparent;border:none;cursor:pointer;padding:0;margin-bottom:var(--space-3)}.lessonSectionToggle .lessonSectionTitle{margin:0}.toggleIcon{color:var(--faint);font-size:.85rem}.lessonContent{white-space:pre-wrap;word-break:break-word;font-family:inherit;font-size:1rem;line-height:1.7;color:var(--text);margin:0}.summaryText{line-height:1.7;color:var(--text);margin:0}.lessonList{list-style:none;padding:0;margin:var(--space-4) 0 0;display:grid;gap:8px}.lessonLink{display:flex;align-items:center;gap:10px;padding:10px 12px;border-radius:10px;border:1px solid var(--border);background:color-mix(in srgb,var(--bg-elev-2) 60%,transparent);color:var(--text);font-size:.95rem}.lessonLink:hover{text-decoration:none;border-color:color-mix(in srgb,var(--primary) 55%,var(--border));background:color-mix(in srgb,var(--primary) 12%,transparent)}.flashcardsGrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:var(--space-4)}.flashcard{perspective:1200px;background:transparent;border:none;cursor:pointer;padding:0;height:160px;text-align:left}.flashcardInner{position:relative;width:100%;height:100%;transform-style:preserve-3d;transition:transform .38s ease;border-radius:var(--radius-sm)}.flashcard.flashcardFlipped .flashcardInner{transform:rotateY(180deg)}.flashcardFace{position:absolute;inset:0;backface-visibility:hidden;-webkit-backface-visibility:hidden;border-radius:var(--radius-sm);border:1px solid var(--border);padding:var(--space-4);display:flex;flex-direction:column;background:color-mix(in srgb,var(--bg-elev-2) 80%,transparent)}.flashcardFace p{margin:8px 0 0;font-size:.95rem;line-height:1.5;color:var(--text)}.flashcardBack{transform:rotateY(180deg);background:color-mix(in srgb,var(--primary) 14%,var(--bg-elev-2));border-color:color-mix(in srgb,var(--primary) 40%,var(--border))}.flashcardLabel{font-size:.78rem;letter-spacing:.07em;text-transform:uppercase;color:var(--faint)}.quizList{list-style:none;padding:0;margin:0 0 var(--space-5);display:grid;gap:var(--space-5)}.quizItem{padding-bottom:var(--space-4);border-bottom:1px solid var(--border)}.quizItem:last-child{border-bottom:none}.quizQuestion{font-weight:600;margin:0 0 var(--space-3);line-height:1.5}.quizChoices{display:grid;gap:8px}.quizChoice{display:flex;align-items:flex-start;gap:10px;padding:10px 12px;border-radius:10px;border:1px solid var(--border);background:color-mix(in srgb,var(--bg-elev-2) 60%,transparent);cursor:pointer;font-size:.95rem;line-height:1.5}.quizChoice input[type=radio]{width:auto;flex-shrink:0;margin-top:2px}.quizChoice:has(input:checked){border-color:color-mix(in srgb,var(--primary) 60%,var(--border));background:color-mix(in srgb,var(--primary) 14%,transparent)}.quizChoiceCorrect{border-color:color-mix(in srgb,var(--primary-2) 65%,var(--border))!important;background:color-mix(in srgb,var(--primary-2) 16%,transparent)!important}.quizChoiceWrong{border-color:color-mix(in srgb,var(--danger) 60%,var(--border))!important;background:color-mix(in srgb,var(--danger) 12%,transparent)!important}.quizExplanation{margin:10px 0 0;font-size:.9rem;color:var(--muted);line-height:1.5}.alertSuccess{border-color:color-mix(in srgb,var(--primary-2) 55%,var(--border));background:color-mix(in srgb,var(--primary-2) 12%,transparent);border-radius:var(--radius);border:1px solid;padding:12px 14px;margin-bottom:var(--space-4)}.chatMessages{display:grid;gap:10px;margin-bottom:var(--space-4);max-height:400px;overflow-y:auto;padding-right:4px}.chatBubble{padding:10px 14px;border-radius:14px;font-size:.95rem;line-height:1.6;max-width:85%;white-space:pre-wrap;word-break:break-word}.chatBubbleUser{background:color-mix(in srgb,var(--primary) 20%,transparent);border:1px solid color-mix(in srgb,var(--primary) 45%,var(--border));margin-left:auto;border-bottom-right-radius:4px}.chatBubbleAi{background:color-mix(in srgb,var(--bg-elev-2) 80%,transparent);border:1px solid var(--border);margin-right:auto;border-bottom-left-radius:4px}.chatBubbleLoading{color:var(--faint);font-style:italic}.chatInputRow{display:grid;gap:10px}.chatInput{resize:vertical;min-height:80px}@media(min-width:640px){.chatInputRow{grid-template-columns:1fr auto;align-items:end}}