@import"https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700&family=Inter:wght@400;500;600&family=JetBrains+Mono:wght@400;500&display=swap";:root{--color-sky-blue: #5BA3D1;--color-sky-blue-dark: #4A8FBD;--color-sky-blue-light: #8CC4E8;--color-sky-blue-pale: #E8F4FA;--color-navy: #2B4B6F;--color-navy-light: #3D6490;--color-accent-green: #7AC943;--color-accent-green-dark: #65B036;--color-accent-green-light: #C5E8A8;--color-fox-orange: #F97316;--color-fox-orange-dark: #EA580C;--color-fox-orange-light: #FDBA74;--color-fox-orange-pale: #FFF7ED;--color-warm-coral: #FB923C;--color-warm-cream: #FFFBEB;--color-white: #FFFFFF;--color-off-white: #F8FAFC;--color-slate-50: #F1F5F9;--color-slate-100: #E2E8F0;--color-slate-200: #CBD5E1;--color-slate-300: #94A3B8;--color-slate-400: #64748B;--color-slate-500: #475569;--color-slate-600: #334155;--color-slate-700: #1E293B;--color-error: #DC2626;--color-error-light: #FEE2E2;--color-success: #16A34A;--color-success-light: #DCFCE7;--color-processing: #5BA3D1;--color-processing-light: #E8F4FA;--font-heading: "Plus Jakarta Sans", system-ui, -apple-system, sans-serif;--font-body: "Inter", system-ui, -apple-system, sans-serif;--font-mono: "JetBrains Mono", "Fira Code", monospace;--font-size-xs: .75rem;--font-size-sm: .875rem;--font-size-base: 1rem;--font-size-lg: 1.125rem;--font-size-xl: 1.25rem;--font-size-2xl: 1.5rem;--font-size-3xl: 2rem;--font-size-4xl: 2.5rem;--line-height-tight: 1.25;--line-height-normal: 1.5;--line-height-relaxed: 1.75;--letter-spacing-tight: -.02em;--letter-spacing-normal: 0;--letter-spacing-wide: .05em;--letter-spacing-wider: .1em;--space-1: .25rem;--space-2: .5rem;--space-3: .75rem;--space-4: 1rem;--space-5: 1.5rem;--space-6: 2rem;--space-7: 2.5rem;--space-8: 3rem;--space-9: 4rem;--space-10: 5rem;--radius-sm: 4px;--radius-md: 8px;--radius-lg: 12px;--radius-xl: 16px;--radius-full: 9999px;--shadow-sm: 0 1px 2px rgba(43, 75, 111, .05);--shadow-md: 0 4px 6px -1px rgba(43, 75, 111, .1), 0 2px 4px -2px rgba(43, 75, 111, .1);--shadow-lg: 0 10px 15px -3px rgba(43, 75, 111, .1), 0 4px 6px -4px rgba(43, 75, 111, .1);--shadow-glass: 0 8px 32px rgba(43, 75, 111, .12);--shadow-button: 0 4px 14px rgba(91, 163, 209, .3);--shadow-button-green: 0 4px 14px rgba(122, 201, 67, .3);--shadow-button-orange: 0 4px 14px rgba(249, 115, 22, .35);--shadow-card: 0 2px 8px rgba(43, 75, 111, .06), 0 1px 3px rgba(43, 75, 111, .04);--shadow-card-hover: 0 8px 24px rgba(43, 75, 111, .1), 0 2px 8px rgba(43, 75, 111, .06);--glass-bg: rgba(255, 255, 255, .7);--glass-bg-light: rgba(255, 255, 255, .5);--glass-bg-medium: rgba(255, 255, 255, .75);--glass-bg-strong: rgba(255, 255, 255, .85);--glass-bg-heavy: rgba(255, 255, 255, .92);--glass-border: rgba(255, 255, 255, .5);--glass-blur: 12px;--z-base: 0;--z-dropdown: 100;--z-sticky: 200;--z-fixed: 500;--z-modal: 1000;--z-toast: 1100;--transition-fast: .15s ease;--transition-normal: .2s ease;--transition-slow: .3s ease;--duration-quick: .15s;--duration-normal: .2s;--duration-slow: .3s;--hover-lift: translateY(-2px);--active-press: translateY(0)}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;text-rendering:optimizeLegibility}body{font-family:var(--font-body);font-size:var(--font-size-base);line-height:var(--line-height-normal);color:var(--color-slate-700);background:linear-gradient(135deg,var(--color-sky-blue-pale) 0%,var(--color-off-white) 50%,#F0FDF4 100%);min-height:100vh;overflow-x:hidden;width:100%}h1,h2,h3,h4,h5,h6{font-family:var(--font-heading);font-weight:600;line-height:var(--line-height-tight);color:var(--color-slate-700)}p{margin-bottom:var(--space-4)}p:last-child{margin-bottom:0}a{color:var(--color-sky-blue-dark);text-decoration:none;transition:color var(--transition-fast)}a:hover{color:var(--color-sky-blue)}::selection{background:var(--color-sky-blue-light);color:var(--color-navy)}:focus-visible{outline:2px solid var(--color-sky-blue);outline-offset:2px}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:var(--color-slate-100)}::-webkit-scrollbar-thumb{background:var(--color-slate-300);border-radius:var(--radius-full)}::-webkit-scrollbar-thumb:hover{background:var(--color-slate-400)}.glass-card{background:var(--glass-bg-strong);backdrop-filter:blur(var(--glass-blur));-webkit-backdrop-filter:blur(var(--glass-blur));border:1px solid var(--glass-border);box-shadow:var(--shadow-glass);border-radius:var(--radius-xl)}@media(max-width:640px){:root{--font-size-3xl: 1.75rem;--font-size-2xl: 1.375rem;--space-6: 1.5rem;--space-7: 2rem;--space-8: 2.5rem}}.app-loading{display:flex;align-items:center;justify-content:center;min-height:100vh}.truncate{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.line-clamp-2{display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.line-clamp-3{display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}.card{background:var(--color-white);border:1px solid var(--color-slate-100);border-radius:var(--radius-lg);box-shadow:var(--shadow-card);transition:box-shadow var(--transition-normal),transform var(--transition-normal)}.card:hover{box-shadow:var(--shadow-card-hover)}.card-glass{background:var(--glass-bg-strong);backdrop-filter:blur(var(--glass-blur));-webkit-backdrop-filter:blur(var(--glass-blur));border:1px solid var(--glass-border);border-radius:var(--radius-lg);box-shadow:var(--shadow-card)}.focus-ring:focus-visible{outline:2px solid var(--color-sky-blue);outline-offset:2px;border-radius:var(--radius-md)}[id]{scroll-margin-top:80px}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border-width:0}.btn-interactive{transition:transform var(--transition-fast),box-shadow var(--transition-fast)}.btn-interactive:hover:not(:disabled){transform:var(--hover-lift)}.btn-interactive:active:not(:disabled){transform:var(--active-press)}.login-container{min-height:100vh;display:flex;flex-direction:column;align-items:center;justify-content:center;background:var(--color-slate-50);padding:var(--space-6);position:relative}.login-back-btn{position:absolute;top:var(--space-6);left:var(--space-6);display:inline-flex;align-items:center;gap:.5rem;padding:.5rem 1rem;background:var(--color-white);color:var(--color-slate-600);border:1px solid var(--color-slate-200);border-radius:var(--radius-md);font-family:var(--font-body);font-size:var(--font-size-sm);font-weight:500;cursor:pointer;transition:all var(--transition-fast)}.login-back-btn:hover{background:var(--color-slate-50);border-color:var(--color-slate-300);color:var(--color-slate-700)}.login-brand{text-align:center;margin-bottom:var(--space-7)}.brand-logo{display:block;width:80px;height:80px;margin:0 auto var(--space-4);object-fit:contain;filter:drop-shadow(0 4px 12px rgba(91,163,209,.3))}.brand-name{font-family:var(--font-heading);font-size:var(--font-size-3xl);font-weight:700;color:var(--color-navy);margin:0 0 var(--space-2);letter-spacing:var(--letter-spacing-tight)}.brand-tagline{font-family:var(--font-body);font-size:var(--font-size-sm);color:var(--color-slate-400);letter-spacing:var(--letter-spacing-wide);text-transform:uppercase;margin:0}.login-form{background:var(--glass-bg-strong);backdrop-filter:blur(var(--glass-blur));-webkit-backdrop-filter:blur(var(--glass-blur));padding:var(--space-8);border-radius:var(--radius-xl);border:1px solid var(--glass-border);box-shadow:var(--shadow-glass);width:100%;max-width:380px;position:relative;overflow:hidden}.login-form:before{content:"";position:absolute;top:0;left:0;right:0;height:4px;background:var(--color-sky-blue)}.form-title{font-family:var(--font-heading);font-size:var(--font-size-2xl);font-weight:600;color:var(--color-navy);margin:0 0 var(--space-6);text-align:center}.form-group{margin-bottom:var(--space-5)}.form-group label{display:block;margin-bottom:var(--space-2);font-family:var(--font-body);font-size:var(--font-size-sm);font-weight:500;color:var(--color-slate-500);letter-spacing:var(--letter-spacing-wide);text-transform:uppercase}.form-group input{width:100%;padding:var(--space-4);border:1px solid var(--color-slate-200);border-radius:var(--radius-md);font-family:var(--font-body);font-size:var(--font-size-base);color:var(--color-slate-700);background:var(--color-white);transition:border-color var(--transition-normal),box-shadow var(--transition-normal)}.form-group input::placeholder{color:var(--color-slate-400)}.form-group input:focus{outline:none;border-color:var(--color-sky-blue);box-shadow:0 0 0 3px #5ba3d133}.login-form button[type=submit]{width:100%;padding:var(--space-4);background:var(--color-sky-blue);color:var(--color-white);border:none;border-radius:var(--radius-lg);font-family:var(--font-body);font-size:var(--font-size-base);font-weight:600;cursor:pointer;margin-top:var(--space-4);box-shadow:var(--shadow-button);transition:all var(--transition-normal)}.login-form button[type=submit]:hover:not(:disabled){background:var(--color-sky-blue-dark);box-shadow:0 6px 20px #5ba3d166;transform:translateY(-1px)}.login-form button[type=submit]:active:not(:disabled){transform:translateY(0)}.login-form button[type=submit]:disabled{opacity:.6;cursor:not-allowed}.error-message{background-color:var(--color-error-light);color:var(--color-error);padding:var(--space-4);border-radius:var(--radius-md);margin-bottom:var(--space-5);text-align:center;font-size:var(--font-size-sm);border:1px solid rgba(220,38,38,.2)}.form-footer{text-align:center;margin-top:var(--space-5);font-size:var(--font-size-sm);color:var(--color-slate-500)}.form-link{background:none;border:none;padding:0;font-family:var(--font-body);font-size:var(--font-size-sm);font-weight:600;color:var(--color-sky-blue);cursor:pointer;transition:color var(--transition-fast)}.form-link:hover{color:var(--color-sky-blue-dark);text-decoration:underline}.form-forgot{text-align:right;margin-top:calc(var(--space-2) * -1);margin-bottom:var(--space-4)}.form-description{font-size:var(--font-size-sm);color:var(--color-slate-500);text-align:center;margin-bottom:var(--space-5);line-height:1.5}.success-message{font-size:var(--font-size-sm);color:var(--color-slate-600);text-align:center;line-height:1.6;margin-bottom:var(--space-5)}.success-message strong{color:var(--color-slate-700)}.form-button-secondary{width:100%;padding:var(--space-4);background:var(--color-white);color:var(--color-sky-blue);border:2px solid var(--color-sky-blue);border-radius:var(--radius-lg);font-family:var(--font-body);font-size:var(--font-size-base);font-weight:600;cursor:pointer;transition:all var(--transition-normal)}.form-button-secondary:hover{background:var(--color-sky-blue);color:var(--color-white)}@media(max-width:640px){.login-container{padding:var(--space-4)}.login-form{padding:var(--space-6)}.login-brand{margin-bottom:var(--space-5)}}.workspace{max-width:700px;margin:0 auto}.upload-zone{margin-bottom:1.5rem}.upload-zone input[type=file]{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);border:0}.upload-zone label{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:3.5rem 2rem;border:2px dashed var(--color-sky-blue);border-radius:var(--radius-xl);background:radial-gradient(ellipse 80% 50% at 50% 120%,rgba(122,201,67,.08) 0%,transparent 50%),radial-gradient(ellipse 60% 40% at 20% 0%,rgba(91,163,209,.1) 0%,transparent 50%),radial-gradient(ellipse 50% 30% at 80% 10%,rgba(249,115,22,.06) 0%,transparent 50%),linear-gradient(180deg,#5ba3d10a,#7ac94305);cursor:pointer;transition:all .3s ease;position:relative;overflow:hidden}.upload-zone label:before,.upload-zone label:after{content:"";position:absolute;width:48px;height:48px;border:3px solid var(--color-sky-blue-light);opacity:.5;transition:all .3s ease}.upload-zone label:before{top:16px;left:16px;border-right:none;border-bottom:none;border-radius:12px 0 0}.upload-zone label:after{bottom:16px;right:16px;border-left:none;border-top:none;border-radius:0 0 12px}.upload-zone label:hover{background:radial-gradient(ellipse 80% 50% at 50% 120%,rgba(122,201,67,.12) 0%,transparent 50%),radial-gradient(ellipse 60% 40% at 20% 0%,rgba(91,163,209,.15) 0%,transparent 50%),radial-gradient(ellipse 50% 30% at 80% 10%,rgba(249,115,22,.08) 0%,transparent 50%),linear-gradient(180deg,#5ba3d10f,#7ac9430a);border-color:var(--color-sky-blue-dark);border-style:solid;transform:translateY(-2px);box-shadow:0 8px 24px #5ba3d126}.upload-zone label:hover:before,.upload-zone label:hover:after{opacity:.8;border-color:var(--color-sky-blue)}.upload-zone label:hover:before{transform:translate(-4px,-4px)}.upload-zone label:hover:after{transform:translate(4px,4px)}.upload-zone label:focus-within{outline:2px solid var(--color-sky-blue);outline-offset:2px}.upload-icon-wrapper{position:relative;display:flex;align-items:center;justify-content:center;width:80px;height:80px;margin-bottom:1.25rem}.upload-icon-wrapper:before{content:"";position:absolute;inset:0;border-radius:50%;background:linear-gradient(135deg,var(--color-sky-blue-pale) 0%,rgba(122,201,67,.15) 100%);animation:iconPulse 3s ease-in-out infinite}.upload-icon-wrapper:after{content:"";position:absolute;inset:-6px;border:2px dashed var(--color-sky-blue-light);border-radius:50%;opacity:.6;animation:iconRingSpin 20s linear infinite}@keyframes iconPulse{0%,to{transform:scale(1);opacity:1}50%{transform:scale(1.05);opacity:.8}}@keyframes iconRingSpin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.upload-icon{position:relative;z-index:1;font-size:2rem;font-weight:400;color:var(--color-sky-blue-dark);line-height:1;display:flex;align-items:center;justify-content:center;width:64px;height:64px;background:var(--color-white);border-radius:50%;box-shadow:0 4px 12px #5ba3d133;transition:all .3s ease}.upload-zone label:hover .upload-icon{transform:scale(1.08);box-shadow:0 6px 16px #5ba3d14d;color:var(--color-sky-blue)}.upload-text{font-family:var(--font-heading);font-size:1.25rem;font-weight:600;color:var(--color-navy);letter-spacing:-.01em}.upload-hint{font-size:.85rem;color:var(--color-slate-400);margin-top:.5rem}.upload-hints{display:flex;justify-content:center;gap:2rem;padding-top:1.25rem;margin-top:.5rem;border-top:1px solid var(--color-slate-100)}.upload-hint-item{display:flex;flex-direction:column;align-items:center;gap:.5rem;cursor:default}.upload-hint-icon{width:44px;height:44px;display:flex;align-items:center;justify-content:center;background:var(--color-white);border:1px solid var(--color-slate-100);border-radius:var(--radius-lg);color:var(--color-slate-400);transition:all .25s ease;box-shadow:0 2px 8px #2b4b6f0a}.upload-hint-item:hover .upload-hint-icon{background:var(--color-sky-blue-pale);border-color:var(--color-sky-blue-light);color:var(--color-sky-blue-dark);transform:translateY(-3px);box-shadow:0 6px 16px #5ba3d126}.upload-hint-icon svg{width:22px;height:22px}.upload-hint-label{font-size:.75rem;font-weight:500;color:var(--color-slate-400);text-align:center;transition:color .2s ease}.upload-hint-item:hover .upload-hint-label{color:var(--color-slate-600)}.error-banner{padding:1rem 1.25rem;background:var(--color-error-light);color:var(--color-error);border-left:3px solid var(--color-error);border-radius:0 var(--radius-md) var(--radius-md) 0;margin-bottom:1.5rem;font-size:.9rem}.error-banner p{margin:0}.error-banner details{margin-top:.75rem}.error-banner summary{cursor:pointer;font-weight:500;font-size:.85rem}.error-banner pre{margin-top:.5rem;padding:.75rem;background:var(--color-white);border-radius:4px;overflow-x:auto;font-family:var(--font-mono);font-size:.75rem;white-space:pre-wrap;word-break:break-word}.spinner{width:20px;height:20px;border:2px solid var(--color-slate-200);border-top-color:var(--color-sky-blue);border-radius:50%;animation:spin .8s linear infinite;flex-shrink:0}.upload-zone .spinner{width:28px;height:28px;margin-bottom:.75rem}.loading-message{animation:fadeIn .4s ease}.upload-zone .loading-message{font-size:1.125rem;font-weight:500;color:var(--color-slate-700)}@keyframes fadeIn{0%{opacity:0;transform:translateY(-4px)}to{opacity:1;transform:translateY(0)}}.preview{display:flex;align-items:center;gap:1rem;padding:1rem 0;border-bottom:1px solid var(--color-slate-200);margin-bottom:2rem}.preview img{width:60px;height:60px;object-fit:cover;border-radius:var(--radius-md);box-shadow:var(--shadow-sm)}.preview-name{font-size:.85rem;color:var(--color-slate-400)}.exercises-header{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:.75rem;margin-bottom:2rem;padding-bottom:1rem;border-bottom:1px solid var(--color-slate-200)}.exercises-meta{display:flex;flex-wrap:wrap;align-items:center;gap:.75rem}.download-pdf-btn{display:inline-flex;align-items:center;gap:.5rem;padding:.5rem 1rem;font-family:var(--font-body);font-size:.85rem;font-weight:600;color:var(--color-white);background:linear-gradient(135deg,var(--color-accent-green) 0%,var(--color-accent-green-dark) 100%);border:none;border-radius:var(--radius-lg);cursor:pointer;box-shadow:var(--shadow-button-green);transition:all .2s ease}.download-pdf-btn:hover{box-shadow:0 6px 20px #7ac94366;transform:translateY(-1px)}.download-pdf-btn:focus{outline:none}.download-pdf-btn:focus-visible{outline:2px solid var(--color-accent-green);outline-offset:2px}.download-pdf-btn:active{transform:translateY(0)}.download-pdf-btn svg{flex-shrink:0}.download-pdf-btn:disabled{opacity:.8;cursor:wait}.download-pdf-btn:disabled:hover{transform:none;box-shadow:var(--shadow-button-green)}.btn-spinner{width:14px;height:14px;border:2px solid rgba(255,255,255,.3);border-top-color:var(--color-white);border-radius:50%;animation:spin .8s linear infinite;flex-shrink:0}.language-badge{font-size:.75rem;font-weight:600;text-transform:uppercase;letter-spacing:.05em;color:var(--color-accent-green-dark);background:var(--color-accent-green-light);padding:.25rem .75rem;border-radius:100px}.topics{display:flex;flex-wrap:wrap;gap:.5rem}.topic{font-size:.8rem;color:var(--color-slate-500)}.topic:not(:last-child):after{content:"·";margin-left:.5rem;color:var(--color-slate-300)}.vocab-section{margin-bottom:2.5rem}.section-title{font-family:var(--font-body);font-size:.75rem;font-weight:600;text-transform:uppercase;letter-spacing:.1em;color:var(--color-slate-400);margin:0 0 1rem}.vocab-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:.75rem;margin:0}.vocab-item{display:flex;flex-direction:column;gap:.25rem;padding:.75rem 1rem;background:var(--color-white);border-radius:var(--radius-md);border:1px solid var(--color-slate-100);transition:all .15s ease}.vocab-list dt{font-weight:600;font-size:.95rem;color:var(--color-navy)}.vocab-list dd{color:var(--color-slate-500);font-size:.875rem;margin:0;line-height:1.4}.exercise-list{display:flex;flex-direction:column;gap:2.5rem}.exercise-type{font-family:var(--font-body);font-size:.7rem;font-weight:600;text-transform:uppercase;letter-spacing:.12em;color:var(--color-navy);margin:0;padding-bottom:.5rem;border-bottom:2px solid var(--color-navy);display:inline-block}.exercise-instruction{font-style:italic;color:var(--color-slate-400);margin:.75rem 0 1.25rem;font-size:.9rem;line-height:1.5}.questions{display:flex;flex-direction:column}.question{padding:1rem 0 1rem 1.5rem;border-bottom:1px solid var(--color-slate-100);cursor:pointer;position:relative;transition:background .15s ease}.question:hover{background:#5ba3d10a}.question:focus{outline:none;background:#5ba3d10f}.options{display:flex;flex-wrap:wrap;gap:.5rem 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