:root{--color-white: rgba(255, 255, 255, 1);--color-black: rgba(0, 0, 0, 1);--color-cream-50: rgba(252, 252, 249, 1);--color-cream-100: rgba(255, 255, 253, 1);--color-gray-200: rgba(245, 245, 245, 1);--color-gray-300: rgba(167, 169, 169, 1);--color-gray-400: rgba(119, 124, 124, 1);--color-slate-500: rgba(98, 108, 113, 1);--color-brown-600: rgba(94, 82, 64, 1);--color-charcoal-700: rgba(31, 33, 33, 1);--color-charcoal-800: rgba(38, 40, 40, 1);--color-slate-900: rgba(19, 52, 59, 1);--color-teal-300: rgba(50, 184, 198, 1);--color-teal-400: rgba(45, 166, 178, 1);--color-teal-500: rgba(33, 128, 141, 1);--color-teal-600: rgba(29, 116, 128, 1);--color-teal-700: rgba(26, 104, 115, 1);--color-teal-800: rgba(41, 150, 161, 1);--color-red-400: rgba(255, 84, 89, 1);--color-red-500: rgba(192, 21, 47, 1);--color-orange-400: rgba(230, 129, 97, 1);--color-orange-500: rgba(168, 75, 47, 1);--color-brown-600-rgb: 94, 82, 64;--color-teal-500-rgb: 33, 128, 141;--color-slate-900-rgb: 19, 52, 59;--color-slate-500-rgb: 98, 108, 113;--color-red-500-rgb: 192, 21, 47;--color-red-400-rgb: 255, 84, 89;--color-orange-500-rgb: 168, 75, 47;--color-orange-400-rgb: 230, 129, 97;--color-bg-1: rgba(59, 130, 246, .08);--color-bg-2: rgba(245, 158, 11, .08);--color-bg-3: rgba(34, 197, 94, .08);--color-bg-4: rgba(239, 68, 68, .08);--color-bg-5: rgba(147, 51, 234, .08);--color-bg-6: rgba(249, 115, 22, .08);--color-bg-7: rgba(236, 72, 153, .08);--color-bg-8: rgba(6, 182, 212, .08);--color-background: var(--color-cream-50);--color-surface: var(--color-cream-100);--color-text: var(--color-slate-900);--color-text-secondary: var(--color-slate-500);--color-primary: var(--color-teal-500);--color-primary-hover: var(--color-teal-600);--color-primary-active: var(--color-teal-700);--color-secondary: rgba(var(--color-brown-600-rgb), .12);--color-secondary-hover: rgba(var(--color-brown-600-rgb), .2);--color-secondary-active: rgba(var(--color-brown-600-rgb), .25);--color-border: rgba(var(--color-brown-600-rgb), .2);--color-btn-primary-text: var(--color-cream-50);--color-card-border: rgba(var(--color-brown-600-rgb), .12);--color-card-border-inner: rgba(var(--color-brown-600-rgb), .12);--color-error: var(--color-red-500);--color-success: var(--color-teal-500);--color-warning: var(--color-orange-500);--color-info: var(--color-slate-500);--color-focus-ring: rgba(var(--color-teal-500-rgb), .4);--color-select-caret: rgba(var(--color-slate-900-rgb), .8);--focus-ring: 0 0 0 3px var(--color-focus-ring);--focus-outline: 2px solid var(--color-primary);--status-bg-opacity: .15;--status-border-opacity: .25;--select-caret-light: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23134252' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");--select-caret-dark: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23f5f5f5' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");--color-success-rgb: 33, 128, 141;--color-error-rgb: 192, 21, 47;--color-warning-rgb: 168, 75, 47;--color-info-rgb: 98, 108, 113;--font-family-base: "FKGroteskNeue", "Geist", "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--font-family-mono: "Berkeley Mono", ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;--font-size-xs: 11px;--font-size-sm: 12px;--font-size-base: 14px;--font-size-md: 14px;--font-size-lg: 16px;--font-size-xl: 18px;--font-size-2xl: 20px;--font-size-3xl: 24px;--font-size-4xl: 30px;--font-weight-normal: 400;--font-weight-medium: 500;--font-weight-semibold: 550;--font-weight-bold: 600;--line-height-tight: 1.2;--line-height-normal: 1.5;--letter-spacing-tight: -.01em;--space-0: 0;--space-1: 1px;--space-2: 2px;--space-4: 4px;--space-6: 6px;--space-8: 8px;--space-10: 10px;--space-12: 12px;--space-16: 16px;--space-20: 20px;--space-24: 24px;--space-32: 32px;--radius-sm: 6px;--radius-base: 8px;--radius-md: 10px;--radius-lg: 12px;--radius-full: 9999px;--shadow-xs: 0 1px 2px rgba(0, 0, 0, .02);--shadow-sm: 0 1px 3px rgba(0, 0, 0, .04), 0 1px 2px rgba(0, 0, 0, .02);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .04), 0 2px 4px -1px rgba(0, 0, 0, .02);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .04), 0 4px 6px -2px rgba(0, 0, 0, .02);--shadow-inset-sm: inset 0 1px 0 rgba(255, 255, 255, .15), inset 0 -1px 0 rgba(0, 0, 0, .03);--duration-fast: .15s;--duration-normal: .25s;--ease-standard: cubic-bezier(.16, 1, .3, 1);--container-sm: 640px;--container-md: 768px;--container-lg: 1024px;--container-xl: 1280px}@media (prefers-color-scheme: dark){:root{--color-gray-400-rgb: 119, 124, 124;--color-teal-300-rgb: 50, 184, 198;--color-gray-300-rgb: 167, 169, 169;--color-gray-200-rgb: 245, 245, 245;--color-bg-1: rgba(29, 78, 216, .15);--color-bg-2: rgba(180, 83, 9, .15);--color-bg-3: rgba(21, 128, 61, .15);--color-bg-4: rgba(185, 28, 28, .15);--color-bg-5: rgba(107, 33, 168, .15);--color-bg-6: rgba(194, 65, 12, .15);--color-bg-7: rgba(190, 24, 93, .15);--color-bg-8: rgba(8, 145, 178, .15);--color-background: var(--color-charcoal-700);--color-surface: #141617;--color-text: var(--color-gray-200);--color-text-secondary: rgba(var(--color-gray-300-rgb), .7);--color-primary: var(--color-teal-300);--color-primary-hover: var(--color-teal-400);--color-primary-active: var(--color-teal-800);--color-secondary: rgba(var(--color-gray-400-rgb), .12);--color-secondary-hover: rgba(var(--color-gray-400-rgb), .25);--color-secondary-active: rgba(var(--color-gray-400-rgb), .3);--color-border: rgba(var(--color-gray-400-rgb), .3);--color-error: var(--color-red-400);--color-success: var(--color-teal-300);--color-warning: var(--color-orange-400);--color-info: var(--color-gray-300);--color-focus-ring: rgba(var(--color-teal-300-rgb), .4);--color-btn-primary-text: var(--color-slate-900);--color-card-border: rgba(255,255,255,.06);--color-card-border-inner: rgba(255,255,255,.05);--shadow-inset-sm: inset 0 1px 0 rgba(255, 255, 255, .1), inset 0 -1px 0 rgba(0, 0, 0, .15);--button-border-secondary: rgba(var(--color-gray-400-rgb), .2);--color-border-secondary: rgba(var(--color-gray-400-rgb), .2);--color-select-caret: rgba(var(--color-gray-200-rgb), .8);--focus-ring: 0 0 0 3px var(--color-focus-ring);--focus-outline: 2px solid var(--color-primary);--status-bg-opacity: .15;--status-border-opacity: .25;--select-caret-light: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23134252' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");--select-caret-dark: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23f5f5f5' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");--color-success-rgb: var(--color-teal-300-rgb);--color-error-rgb: var(--color-red-400-rgb);--color-warning-rgb: var(--color-orange-400-rgb);--color-info-rgb: var(--color-gray-300-rgb)}}[data-color-scheme=dark]{--color-gray-400-rgb: 119, 124, 124;--color-teal-300-rgb: 50, 184, 198;--color-gray-300-rgb: 167, 169, 169;--color-gray-200-rgb: 245, 245, 245;--color-bg-1: rgba(29, 78, 216, .15);--color-bg-2: rgba(180, 83, 9, .15);--color-bg-3: rgba(21, 128, 61, .15);--color-bg-4: rgba(185, 28, 28, .15);--color-bg-5: rgba(107, 33, 168, .15);--color-bg-6: rgba(194, 65, 12, .15);--color-bg-7: rgba(190, 24, 93, .15);--color-bg-8: rgba(8, 145, 178, .15);--color-background: var(--color-charcoal-700);--color-surface: var(--color-charcoal-800);--color-text: var(--color-gray-200);--color-text-secondary: rgba(var(--color-gray-300-rgb), .7);--color-primary: var(--color-teal-300);--color-primary-hover: var(--color-teal-400);--color-primary-active: var(--color-teal-800);--color-secondary: rgba(var(--color-gray-400-rgb), .15);--color-secondary-hover: rgba(var(--color-gray-400-rgb), .25);--color-secondary-active: rgba(var(--color-gray-400-rgb), .3);--color-border: rgba(var(--color-gray-400-rgb), .3);--color-error: var(--color-red-400);--color-success: var(--color-teal-300);--color-warning: var(--color-orange-400);--color-info: var(--color-gray-300);--color-focus-ring: rgba(var(--color-teal-300-rgb), .4);--color-btn-primary-text: var(--color-slate-900);--color-card-border: rgba(var(--color-gray-400-rgb), .15);--color-card-border-inner: rgba(var(--color-gray-400-rgb), .15);--shadow-inset-sm: inset 0 1px 0 rgba(255, 255, 255, .1), inset 0 -1px 0 rgba(0, 0, 0, .15);--color-border-secondary: rgba(var(--color-gray-400-rgb), .2);--color-select-caret: rgba(var(--color-gray-200-rgb), .8);--focus-ring: 0 0 0 3px var(--color-focus-ring);--focus-outline: 2px solid var(--color-primary);--status-bg-opacity: .15;--status-border-opacity: .25;--select-caret-light: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23134252' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");--select-caret-dark: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23f5f5f5' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");--color-success-rgb: var(--color-teal-300-rgb);--color-error-rgb: var(--color-red-400-rgb);--color-warning-rgb: var(--color-orange-400-rgb);--color-info-rgb: var(--color-gray-300-rgb)}[data-color-scheme=light]{--color-brown-600-rgb: 94, 82, 64;--color-teal-500-rgb: 33, 128, 141;--color-slate-900-rgb: 19, 52, 59;--color-background: var(--color-cream-50);--color-surface: var(--color-cream-100);--color-text: var(--color-slate-900);--color-text-secondary: var(--color-slate-500);--color-primary: var(--color-teal-500);--color-primary-hover: var(--color-teal-600);--color-primary-active: var(--color-teal-700);--color-secondary: rgba(var(--color-brown-600-rgb), .12);--color-secondary-hover: rgba(var(--color-brown-600-rgb), .2);--color-secondary-active: rgba(var(--color-brown-600-rgb), .25);--color-border: rgba(var(--color-brown-600-rgb), .2);--color-btn-primary-text: var(--color-cream-50);--color-card-border: rgba(var(--color-brown-600-rgb), .12);--color-card-border-inner: rgba(var(--color-brown-600-rgb), .12);--color-error: var(--color-red-500);--color-success: var(--color-teal-500);--color-warning: var(--color-orange-500);--color-info: var(--color-slate-500);--color-focus-ring: rgba(var(--color-teal-500-rgb), .4);--color-success-rgb: var(--color-teal-500-rgb);--color-error-rgb: var(--color-red-500-rgb);--color-warning-rgb: var(--color-orange-500-rgb);--color-info-rgb: var(--color-slate-500-rgb)}html{font-size:var(--font-size-base);font-family:var(--font-family-base);line-height:var(--line-height-normal);color:var(--color-text);background-color:var(--color-background);-webkit-font-smoothing:antialiased;box-sizing:border-box}body{margin:0;padding:0}*,*:before,*:after{box-sizing:inherit}h1,h2,h3,h4,h5,h6{margin:0;font-weight:var(--font-weight-semibold);line-height:var(--line-height-tight);color:var(--color-text);letter-spacing:var(--letter-spacing-tight)}h1{font-size:var(--font-size-4xl)}h2{font-size:var(--font-size-3xl)}h3{font-size:var(--font-size-2xl)}h4{font-size:var(--font-size-xl)}h5{font-size:var(--font-size-lg)}h6{font-size:var(--font-size-md)}p{margin:0 0 var(--space-16) 0}a{color:var(--color-primary);text-decoration:none;transition:color var(--duration-fast) var(--ease-standard)}a:hover{color:var(--color-primary-hover)}code,pre{font-family:var(--font-family-mono);font-size:calc(var(--font-size-base) * .95);background-color:var(--color-secondary);border-radius:var(--radius-sm)}code{padding:var(--space-1) var(--space-4)}pre{padding:var(--space-16);margin:var(--space-16) 0;overflow:auto;border:1px solid var(--color-border)}pre code{background:none;padding:0}.btn{display:inline-flex;align-items:center;justify-content:center;padding:var(--space-8) var(--space-16);border-radius:var(--radius-base);font-size:var(--font-size-base);font-weight:500;line-height:1.5;cursor:pointer;transition:all var(--duration-normal) var(--ease-standard);border:none;text-decoration:none;position:relative}.btn:focus-visible{outline:none;box-shadow:var(--focus-ring)}.btn--primary:hover{background:var(--color-primary-hover)}.btn--primary:active{background:var(--color-primary-active)}.btn--secondary:active{background:var(--color-secondary-active)}.btn--sm{padding:var(--space-4) var(--space-12);font-size:var(--font-size-sm);border-radius:var(--radius-sm)}.btn--lg{padding:var(--space-10) var(--space-20);font-size:var(--font-size-lg);border-radius:var(--radius-md)}.btn--full-width{width:100%}.btn:disabled{opacity:.5;cursor:not-allowed}.form-control{display:block;width:100%;padding:var(--space-8) var(--space-12);font-size:var(--font-size-md);line-height:1.5;color:var(--color-text);background-color:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-base);transition:border-color var(--duration-fast) var(--ease-standard),box-shadow var(--duration-fast) var(--ease-standard)}textarea.form-control{font-family:var(--font-family-base);font-size:var(--font-size-base)}select.form-control{padding:var(--space-8) var(--space-12);-webkit-appearance:none;-moz-appearance:none;appearance:none;background-image:var(--select-caret-light);background-repeat:no-repeat;background-position:right var(--space-12) center;background-size:16px;padding-right:var(--space-32)}@media (prefers-color-scheme: dark){select.form-control{background-image:var(--select-caret-dark)}}[data-color-scheme=dark] select.form-control{background-image:var(--select-caret-dark)}[data-color-scheme=light] 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768px){.container{max-width:var(--container-md)}}@media (min-width: 1024px){.container{max-width:var(--container-lg)}}@media (min-width: 1280px){.container{max-width:var(--container-xl)}}.flex{display:flex}.flex-col{flex-direction:column}.items-center{align-items:center}.justify-center{justify-content:center}.justify-between{justify-content:space-between}.gap-4{gap:var(--space-4)}.gap-8{gap:var(--space-8)}.gap-16{gap:var(--space-16)}.m-0{margin:0}.mt-8{margin-top:var(--space-8)}.mb-8{margin-bottom:var(--space-8)}.mx-8{margin-left:var(--space-8);margin-right:var(--space-8)}.my-8{margin-top:var(--space-8);margin-bottom:var(--space-8)}.p-0{padding:0}.py-8{padding-top:var(--space-8);padding-bottom:var(--space-8)}.px-8{padding-left:var(--space-8);padding-right:var(--space-8)}.py-16{padding-top:var(--space-16);padding-bottom:var(--space-16)}.px-16{padding-left:var(--space-16);padding-right:var(--space-16)}.block{display:block}.hidden{display:none}.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}:focus-visible{outline:var(--focus-outline);outline-offset:2px}[data-color-scheme=dark] 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rotate(0)}50%{transform:scale(1.2) rotate(180deg)}to{transform:scale(1) rotate(360deg)}}.completion-title{font-size:var(--font-size-3xl);font-weight:var(--font-weight-bold);margin-bottom:var(--space-12);background:var(--gradient-primary);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.completion-message{font-size:var(--font-size-lg);color:var(--color-text-secondary);margin-bottom:var(--space-24)}.completion-xp{background:var(--gradient-success);color:#fff;padding:var(--space-20);border-radius:16px;margin-bottom:var(--space-24)}.completion-xp-value{font-size:var(--font-size-4xl);font-weight:var(--font-weight-bold);display:block;margin-bottom:var(--space-4)}.completion-xp-label{font-size:var(--font-size-base);opacity:.9}.completion-actions{display:flex;gap:var(--space-12)}.completion-btn{flex:1;padding:var(--space-16);border-radius:16px;font-size:var(--font-size-lg);font-weight:var(--font-weight-semibold);border:none;cursor:pointer;transition:all .3s ease}.completion-btn.primary{background:var(--gradient-primary);color:#fff}.completion-btn.primary:hover{transform:translateY(-2px);box-shadow:0 8px 24px #667eea66}.completion-btn.secondary{background:var(--color-secondary);color:var(--color-text)}.completion-btn.secondary:hover{background:var(--color-secondary-hover)}@media (max-width: 768px){.lesson-categories-grid{grid-template-columns:1fr}.lesson-step-card{padding:var(--space-24)}.flashcard-term{font-size:24px}.flashcard-definition{font-size:var(--font-size-lg)}.quiz-question,.typing-question,.matching-question{font-size:var(--font-size-xl)}.matching-pairs,.summary-stats{grid-template-columns:1fr}}@media (max-width: 480px){.lesson-player-content{padding:var(--space-16)}.lesson-step-card{padding:var(--space-20)}.category-icon-wrapper{width:48px;height:48px;font-size:24px}.typing-input{font-size:var(--font-size-lg)}.completion-xp-value{font-size:var(--font-size-3xl)}}@media (prefers-reduced-motion: 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