:root{--color-bg: #fafafa;--color-surface: #ffffff;--color-surface-hover: #f8f9fa;--color-border: #e9ecef;--color-border-strong: #d0d5dd;--color-text-primary: #1a1a2e;--color-text-secondary: #6c757d;--color-text-muted: #adb5bd;--color-accent: #6366f1;--color-accent-hover: #4f46e5;--color-accent-light: #eef2ff;--color-accent-subtle: rgba(99, 102, 241, .08);--color-success: #10b981;--color-success-light: #ecfdf5;--color-success-border: #a7f3d0;--color-error: #ef4444;--color-error-light: #fef2f2;--color-error-border: #fecaca;--color-warning: #f59e0b;--color-warning-light: #fffbeb;--color-shadow-sm: 0 1px 2px rgba(0, 0, 0, .04);--color-shadow-md: 0 4px 12px rgba(0, 0, 0, .06);--color-shadow-lg: 0 8px 24px rgba(0, 0, 0, .08);--font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--font-weight-normal: 400;--font-weight-medium: 500;--font-weight-semibold: 600;--font-weight-bold: 700;--space-1: 4px;--space-2: 8px;--space-3: 12px;--space-4: 16px;--space-5: 20px;--space-6: 24px;--space-8: 32px;--space-10: 40px;--space-12: 48px;--space-16: 64px;--radius-sm: 6px;--radius-md: 10px;--radius-lg: 14px;--radius-xl: 18px;--radius-full: 9999px;--page-max-width: 900px;--appbar-height: 64px;--bottom-nav-height: 64px;color-scheme:light;font-family:var(--font-family);background:var(--color-bg);color:var(--color-text-primary)}[data-theme=dark]{--color-bg: #0f0f1a;--color-surface: #1a1a2e;--color-surface-hover: #252540;--color-border: #2a2a40;--color-border-strong: #3a3a55;--color-text-primary: #e4e4ed;--color-text-secondary: #9d9db5;--color-text-muted: #6b6b85;--color-accent: #818cf8;--color-accent-hover: #6366f1;--color-accent-light: #1e1e3a;--color-accent-subtle: rgba(129, 140, 248, .12);--color-success: #34d399;--color-success-light: #0a2e1a;--color-success-border: #065f46;--color-error: #f87171;--color-error-light: #2e0a0a;--color-error-border: #7f1d1d;--color-warning: #fbbf24;--color-warning-light: #2e260a;--color-shadow-sm: 0 1px 2px rgba(0, 0, 0, .3);--color-shadow-md: 0 4px 12px rgba(0, 0, 0, .4);--color-shadow-lg: 0 8px 24px rgba(0, 0, 0, .5);color-scheme:dark}[data-theme=dark] .appbar{background:#1a1a2ed9}[data-theme=dark] .bottom-nav{background:#1a1a2eeb}[data-theme=dark] .auth-page,[data-theme=dark] .onboarding-page{background:linear-gradient(135deg,#16162a,#0f0f1a,#0a1a14)}[data-theme=dark] .feedback-correct .feedback-title,[data-theme=dark] .feedback-correct .feedback-score,[data-theme=dark] .feedback-correct .feedback-text{color:#6ee7b7}[data-theme=dark] .feedback-incorrect .feedback-title,[data-theme=dark] .feedback-incorrect .feedback-score,[data-theme=dark] .feedback-incorrect .feedback-text{color:#fca5a5}[data-theme=dark] .feedback-expected{border-top-color:#ffffff14}[data-theme=dark] .profile-dropdown{border-color:var(--color-border);box-shadow:var(--color-shadow-lg)}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{-webkit-text-size-adjust:100%;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}html,body,#root{min-height:100%}body{margin:0;background:var(--color-bg);color:var(--color-text-primary);font-size:.9375rem;line-height:1.6}#root{display:flex;flex-direction:column}h1,h2,h3,h4{font-weight:var(--font-weight-semibold);line-height:1.3;color:var(--color-text-primary)}h1{font-size:1.625rem;letter-spacing:-.02em}h2{font-size:1.125rem}h3{font-size:1rem}h4{font-size:.9375rem}p{margin:0;line-height:1.6;color:var(--color-text-secondary)}small,.text-sm{font-size:.8125rem;color:var(--color-text-muted)}a{color:var(--color-accent);text-decoration:none;font-weight:var(--font-weight-medium);transition:color .15s ease}a:hover{color:var(--color-accent-hover)}.app-wrapper{display:flex;flex-direction:column;min-height:100vh}.appbar{position:fixed;top:0;left:0;right:0;z-index:100;height:var(--appbar-height);background:#ffffffd9;backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--color-border);display:none;align-items:center;padding:0 var(--space-8)}.appbar-inner{max-width:var(--page-max-width);margin:0 auto;width:100%;display:flex;align-items:center;justify-content:space-between}.appbar-brand{font-size:1.125rem;font-weight:var(--font-weight-bold);color:var(--color-text-primary);letter-spacing:-.02em;display:flex;align-items:center;gap:var(--space-2)}.appbar-brand-icon{width:28px;height:28px;background:var(--color-accent);border-radius:var(--radius-sm);display:flex;align-items:center;justify-content:center;color:#fff;font-size:.875rem;font-weight:var(--font-weight-bold)}.appbar-nav{display:flex;align-items:center;gap:var(--space-1)}.appbar-link{display:inline-flex;align-items:center;gap:var(--space-2);padding:var(--space-2) var(--space-4);border-radius:var(--radius-md);font-size:.875rem;font-weight:var(--font-weight-medium);color:var(--color-text-secondary);transition:all .15s ease;text-decoration:none;white-space:nowrap}.appbar-link:hover{background:var(--color-surface-hover);color:var(--color-text-primary)}.appbar-link.active{background:var(--color-accent-subtle);color:var(--color-accent);font-weight:var(--font-weight-semibold)}.appbar-actions{display:flex;align-items:center;gap:var(--space-3)}.profile-menu{position:relative}.theme-toggle{width:40px;height:40px;border-radius:var(--radius-full);border:2px solid var(--color-border);background:var(--color-surface);color:var(--color-text-secondary);cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .15s ease;flex-shrink:0}.theme-toggle:hover{border-color:var(--color-accent);color:var(--color-accent);background:var(--color-accent-light)}.profile-trigger{width:40px;height:40px;border-radius:var(--radius-full);border:2px solid var(--color-border);background:var(--color-surface);color:var(--color-text-secondary);cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .15s ease}.profile-trigger:hover{border-color:var(--color-accent);color:var(--color-accent);background:var(--color-accent-light)}.profile-dropdown{position:absolute;top:calc(100% + 8px);right:0;min-width:200px;background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-lg);box-shadow:var(--color-shadow-lg);overflow:hidden;z-index:200;animation:dropdownFadeIn .12s ease-out}@keyframes dropdownFadeIn{0%{opacity:0;transform:translateY(-4px)}to{opacity:1;transform:translateY(0)}}.profile-dropdown-header{display:flex;align-items:center;gap:var(--space-3);padding:var(--space-3) var(--space-4);font-size:.8125rem;font-weight:var(--font-weight-medium);color:var(--color-text-primary);border-bottom:1px solid var(--color-border);background:var(--color-surface-hover);word-break:break-all}.profile-dropdown-header svg{flex-shrink:0;color:var(--color-text-muted)}.profile-dropdown-item{display:flex;align-items:center;gap:var(--space-3);width:100%;padding:var(--space-3) var(--space-4);font-size:.875rem;font-weight:var(--font-weight-medium);color:var(--color-text-secondary);background:none;border:none;cursor:pointer;text-align:left;text-decoration:none;font-family:var(--font-family);transition:background .1s ease}.profile-dropdown-item:hover{background:var(--color-surface-hover);color:var(--color-text-primary)}.profile-dropdown-item svg{flex-shrink:0;color:var(--color-text-muted)}.profile-dropdown-item:last-child{border-top:1px solid var(--color-border);color:var(--color-error)}.profile-dropdown-item:last-child:hover{background:var(--color-error-light)}.profile-dropdown-item:last-child svg{color:var(--color-error)}.level-selector{position:relative;margin-left:auto}.level-selector-trigger{display:inline-flex;align-items:center;gap:4px;padding:2px 8px;border:1px solid var(--color-border);border-radius:var(--radius-sm);background:var(--color-surface);color:var(--color-text-primary);font-size:.8125rem;font-weight:var(--font-weight-semibold);cursor:pointer;transition:all .15s ease;font-family:var(--font-family)}.level-selector-trigger:hover{border-color:var(--color-accent);color:var(--color-accent)}.level-selector-trigger svg:first-child{color:var(--color-text-muted)}.level-selector-trigger svg:last-child{color:var(--color-text-muted);margin-left:2px}.level-selector-dropdown{position:absolute;top:calc(100% + 4px);right:0;min-width:64px;background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-md);box-shadow:var(--color-shadow-md);overflow:hidden;z-index:210;animation:dropdownFadeIn .1s ease-out}.level-selector-option{display:block;width:100%;padding:6px 12px;border:none;background:none;font-size:.8125rem;font-weight:var(--font-weight-medium);color:var(--color-text-secondary);cursor:pointer;text-align:center;font-family:var(--font-family);transition:background .1s ease}.level-selector-option:hover{background:var(--color-surface-hover);color:var(--color-text-primary)}.level-selector-option.active{background:var(--color-accent-subtle);color:var(--color-accent);font-weight:var(--font-weight-semibold)}.level-dropdown-item{display:flex;align-items:center;gap:var(--space-3);width:100%;padding:var(--space-3) var(--space-4);font-size:.875rem;font-weight:var(--font-weight-medium);color:var(--color-text-secondary)}.bottom-nav{position:fixed;bottom:0;left:0;right:0;z-index:100;height:var(--bottom-nav-height);background:#ffffffeb;backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-top:1px solid var(--color-border);display:flex;align-items:center;justify-content:space-around;padding:0 var(--space-2);padding-bottom:env(safe-area-inset-bottom,0)}.bottom-nav-link{display:flex;flex-direction:column;align-items:center;gap:2px;padding:var(--space-2) var(--space-3);border-radius:var(--radius-md);font-size:.6875rem;font-weight:var(--font-weight-medium);color:var(--color-text-muted);text-decoration:none;transition:all .15s ease;min-width:56px;background:none;border:none;cursor:pointer}.bottom-nav-link .nav-icon{width:22px;height:22px;display:flex;align-items:center;justify-content:center;font-size:1.125rem}.bottom-nav-link:hover{color:var(--color-text-secondary)}.bottom-nav-link.active{color:var(--color-accent)}.mobile-profile-overlay{position:fixed;top:0;right:0;bottom:0;left:0;z-index:200;background:#0006;animation:fadeIn .2s ease}.mobile-profile-sheet{position:fixed;bottom:0;left:0;right:0;z-index:201;background:var(--color-surface);border-radius:var(--radius-xl) var(--radius-xl) 0 0;padding:var(--space-2) var(--space-5) calc(var(--space-5) + env(safe-area-inset-bottom,0));animation:slideUp .25s ease}.mobile-profile-sheet-handle{width:36px;height:4px;border-radius:var(--radius-full);background:var(--color-border-strong);margin:var(--space-2) auto var(--space-4)}.mobile-profile-sheet-header{display:flex;align-items:center;gap:var(--space-3);padding:var(--space-3) 0;color:var(--color-text-primary);font-weight:var(--font-weight-medium);font-size:.9375rem}.mobile-profile-sheet-email{word-break:break-all}.mobile-profile-sheet-divider{height:1px;background:var(--color-border);margin:var(--space-2) 0}.mobile-profile-sheet-row{display:flex;align-items:center;justify-content:space-between;padding:var(--space-3) 0;font-size:.9375rem;color:var(--color-text-primary)}.mobile-profile-sheet-link{display:flex;align-items:center;gap:var(--space-3);width:100%;padding:var(--space-3) 0;border:none;background:none;font-size:.9375rem;color:var(--color-text-primary);cursor:pointer;text-decoration:none}.mobile-profile-sheet-signout{color:var(--color-error)}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideUp{0%{transform:translateY(100%)}to{transform:translateY(0)}}@media (min-width: 768px){.mobile-profile-overlay,.mobile-profile-sheet{display:none}}.main-content{flex:1;padding:var(--space-6) var(--space-5);padding-bottom:calc(var(--bottom-nav-height) + var(--space-6));max-width:var(--page-max-width);margin:0 auto;width:100%}@media (min-width: 768px){.appbar{display:flex}.bottom-nav{display:none}.main-content{padding-top:calc(var(--appbar-height) + var(--space-8));padding-left:var(--space-8);padding-right:var(--space-8);padding-bottom:var(--space-12)}.md\:flex-row{flex-direction:row}.md\:flex-row>.btn-full{width:auto}}.page-header{margin-bottom:var(--space-8)}.page-header h1{margin-bottom:var(--space-1)}.page-header p{font-size:.9375rem}.card{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-xl);padding:var(--space-6);transition:box-shadow .2s ease,transform .2s ease}.card:hover{box-shadow:var(--color-shadow-md)}.card-header{display:flex;align-items:flex-start;justify-content:space-between;margin-bottom:var(--space-4)}.card-title{font-size:1rem;font-weight:var(--font-weight-semibold);color:var(--color-text-primary)}.metric-card{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-xl);padding:var(--space-6);display:flex;flex-direction:column;gap:var(--space-2);transition:box-shadow .2s ease,transform .2s ease}.metric-card:hover{box-shadow:var(--color-shadow-md);transform:translateY(-1px)}.metric-card .metric-icon{width:40px;height:40px;border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;font-size:1.25rem;margin-bottom:var(--space-1)}.metric-card .metric-label{font-size:.8125rem;font-weight:var(--font-weight-medium);color:var(--color-text-muted);text-transform:uppercase;letter-spacing:.04em}.metric-card .metric-value{font-size:1.75rem;font-weight:var(--font-weight-bold);color:var(--color-text-primary);letter-spacing:-.02em;line-height:1.2}.metric-card .metric-sub{font-size:.8125rem;color:var(--color-text-secondary)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--space-2);padding:var(--space-3) var(--space-5);border:none;border-radius:var(--radius-lg);font-family:var(--font-family);font-size:.875rem;font-weight:var(--font-weight-semibold);cursor:pointer;transition:all .15s ease;text-decoration:none;line-height:1.4;white-space:nowrap}.btn:disabled{opacity:.5;cursor:not-allowed;transform:none}.btn-primary{background:var(--color-accent);color:#fff}.btn-primary:hover:not(:disabled){background:var(--color-accent-hover);color:#fff;box-shadow:var(--color-shadow-md)}.btn-secondary{background:transparent;color:var(--color-text-secondary);border:1px solid var(--color-border)}.btn-secondary:hover:not(:disabled){background:var(--color-surface-hover);border-color:var(--color-border-strong);color:var(--color-text-primary)}.btn-ghost{background:transparent;color:var(--color-text-secondary);padding:var(--space-2) var(--space-3)}.btn-ghost:hover:not(:disabled){background:var(--color-surface-hover);color:var(--color-text-primary)}.btn-sm{padding:var(--space-2) var(--space-3);font-size:.8125rem;border-radius:var(--radius-md)}.btn-lg{padding:var(--space-4) var(--space-6);font-size:.9375rem}.btn-full{width:100%}.btn-icon{width:40px;height:40px;padding:0;display:flex;align-items:center;justify-content:center;border-radius:var(--radius-md)}.form-group{display:flex;flex-direction:column;gap:var(--space-2)}.form-label{font-size:.8125rem;font-weight:var(--font-weight-semibold);color:var(--color-text-primary);letter-spacing:.01em}.form-input{width:100%;padding:var(--space-3) var(--space-4);border:1px solid var(--color-border);border-radius:var(--radius-lg);background:var(--color-surface);font-family:var(--font-family);font-size:.9375rem;color:var(--color-text-primary);transition:border-color .15s ease,box-shadow .15s ease;outline:none}.form-input::placeholder{color:var(--color-text-muted)}.form-input:focus{border-color:var(--color-accent);box-shadow:0 0 0 3px var(--color-accent-subtle)}.form-input.error{border-color:var(--color-error)}.form-input.error:focus{box-shadow:0 0 0 3px #ef44441f}textarea.form-input{min-height:100px;resize:vertical;line-height:1.6}.alert{display:flex;align-items:flex-start;gap:var(--space-3);padding:var(--space-4) var(--space-5);border-radius:var(--radius-lg);font-size:.875rem;line-height:1.5}.alert-icon{flex-shrink:0;width:20px;height:20px;display:flex;align-items:center;justify-content:center;font-size:.875rem;margin-top:1px}.alert-error{background:var(--color-error-light);color:var(--color-error);border:1px solid var(--color-error-border)}.alert-success{background:var(--color-success-light);color:var(--color-success);border:1px solid var(--color-success-border)}.badge{display:inline-flex;align-items:center;padding:2px 10px;border-radius:var(--radius-full);font-size:.75rem;font-weight:var(--font-weight-semibold);text-transform:uppercase;letter-spacing:.04em;background:var(--color-accent-light);color:var(--color-accent)}.badge-neutral{background:var(--color-surface-hover);color:var(--color-text-secondary)}.badge-success{background:var(--color-success-light);color:var(--color-success)}.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:var(--space-4)}.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--space-4)}.grid-auto{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:var(--space-4)}@media (max-width: 600px){.grid-2{grid-template-columns:1fr}}@media (max-width: 600px){.dashboard-metrics{gap:var(--space-3)}.dashboard-metrics .metric-card{padding:var(--space-3) var(--space-2);gap:var(--space-1);text-align:center;align-items:center}.dashboard-metrics .metric-card .metric-icon{width:28px;height:28px;font-size:.875rem}.dashboard-metrics .metric-card .metric-value{font-size:1.125rem}.dashboard-metrics .metric-card .metric-label,.dashboard-metrics .metric-card .metric-sub{font-size:.625rem;max-width:100%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}}.section-title{font-size:1rem;font-weight:var(--font-weight-semibold);color:var(--color-text-primary);margin-top:var(--space-8);margin-bottom:var(--space-4)}.auth-page{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:var(--space-6);background:linear-gradient(135deg,#f5f3ff,#fafafa,#ecfdf5)}.auth-card{width:100%;max-width:420px;background:var(--color-surface);border:1px solid var(--color-border);border-radius:20px;padding:var(--space-10);box-shadow:var(--color-shadow-lg)}.auth-brand{display:flex;align-items:center;justify-content:center;gap:var(--space-3);margin-bottom:var(--space-8)}.auth-brand-icon{width:36px;height:36px;background:var(--color-accent);border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;color:#fff;font-size:1.125rem;font-weight:var(--font-weight-bold)}.auth-brand-text{font-size:1.25rem;font-weight:var(--font-weight-bold);color:var(--color-text-primary);letter-spacing:-.02em}.auth-heading{text-align:center;margin-bottom:var(--space-2)}.auth-subtitle{text-align:center;font-size:.875rem;color:var(--color-text-secondary);margin-bottom:var(--space-6)}.auth-form{display:flex;flex-direction:column;gap:var(--space-5)}.auth-footer{text-align:center;margin-top:var(--space-6);font-size:.875rem;color:var(--color-text-secondary)}.onboarding-page{min-height:100vh;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:var(--space-6);background:linear-gradient(135deg,#f5f3ff,#fafafa,#ecfdf5)}.onboarding-card{width:100%;max-width:520px;background:var(--color-surface);border:1px solid var(--color-border);border-radius:20px;padding:var(--space-10);box-shadow:var(--color-shadow-lg);text-align:center}.onboarding-cards{display:grid;grid-template-columns:1fr 1fr;gap:var(--space-4);margin-top:var(--space-6)}@media (max-width: 480px){.onboarding-cards{grid-template-columns:1fr}}.level-card{background:var(--color-surface);border:2px solid var(--color-border);border-radius:var(--radius-xl);padding:var(--space-6);cursor:pointer;text-align:left;transition:all .2s ease;display:flex;flex-direction:column;gap:var(--space-2);font-family:var(--font-family)}.level-card:hover{border-color:var(--color-accent);box-shadow:var(--color-shadow-md);transform:translateY(-2px)}.level-card:disabled{opacity:.5;cursor:not-allowed;transform:none}.level-card .level-name{font-size:1.5rem;font-weight:var(--font-weight-bold);color:var(--color-text-primary)}.level-card .level-desc{font-size:.875rem;color:var(--color-text-secondary);line-height:1.5}.exercise-card{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-xl);padding:var(--space-8)}.exercise-meta{display:flex;align-items:center;gap:var(--space-3);margin-bottom:var(--space-4);font-size:.8125rem;color:var(--color-text-muted)}.exercise-meta .sep{color:var(--color-border)}.exercise-progress{display:flex;align-items:center;gap:var(--space-3);margin-bottom:var(--space-6)}.exercise-progress-bar{flex:1;height:4px;background:var(--color-border);border-radius:var(--radius-full);overflow:hidden}.exercise-progress-fill{height:100%;background:var(--color-accent);border-radius:var(--radius-full);transition:width .4s ease}.exercise-progress-text{font-size:.8125rem;font-weight:var(--font-weight-medium);color:var(--color-text-muted);white-space:nowrap}.exercise-prompt{font-size:1.0625rem;line-height:1.7;color:var(--color-text-primary);margin-bottom:var(--space-6);padding:var(--space-5);background:var(--color-bg);border-radius:var(--radius-lg);border-left:3px solid var(--color-accent)}.exercise-answer-area{margin-bottom:var(--space-4)}.feedback-block{border-radius:var(--radius-lg);padding:var(--space-5);margin-bottom:var(--space-5)}.feedback-correct{background:var(--color-success-light);border:1px solid var(--color-success-border)}.feedback-incorrect{background:var(--color-error-light);border:1px solid 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