:root{--color-primary: #2563eb;--color-primary-hover: #1d4ed8;--color-primary-light: #dbeafe;--color-primary-soft: #eff6ff;--color-secondary: #059669;--color-secondary-hover: #047857;--color-secondary-light: #d1fae5;--color-accent: #f59e0b;--color-accent-light: #fef3c7;--color-danger: #dc2626;--color-danger-light: #fee2e2;--color-success: #16a34a;--color-success-light: #dcfce7;--color-bg: #fafbfc;--color-bg-card: #ffffff;--color-bg-elevated: #f1f5f9;--color-bg-overlay: rgba(0, 0, 0, .4);--color-text: #1e293b;--color-text-secondary: #64748b;--color-text-muted: #94a3b8;--color-text-inverse: #ffffff;--color-border: #e2e8f0;--color-border-hover: #cbd5e1;--font-family: "Inter", "Noto Sans JP", system-ui, -apple-system, sans-serif;--font-size-xs: .8125rem;--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: 1.875rem;--font-size-4xl: 2.25rem;--font-weight-normal: 400;--font-weight-medium: 500;--font-weight-semibold: 600;--font-weight-bold: 700;--line-height: 1.6;--line-height-tight: 1.3;--space-xs: .25rem;--space-sm: .5rem;--space-md: 1rem;--space-lg: 1.5rem;--space-xl: 2rem;--space-2xl: 3rem;--space-3xl: 4rem;--max-width: 1200px;--sidebar-width: 260px;--header-height: 64px;--border-radius: 12px;--border-radius-sm: 8px;--border-radius-lg: 16px;--border-radius-full: 9999px;--touch-target: 44px;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .05);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .07), 0 2px 4px -2px rgba(0, 0, 0, .05);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .08), 0 4px 6px -4px rgba(0, 0, 0, .05);--shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, .1), 0 8px 10px -6px rgba(0, 0, 0, .05);--transition-fast: .15s ease;--transition-normal: .25s ease;--transition-slow: .35s ease;--z-dropdown: 100;--z-modal: 200;--z-chat: 300;--z-toast: 400}[data-theme=dark]{--color-primary: #60a5fa;--color-primary-hover: #3b82f6;--color-primary-light: #1e3a5f;--color-primary-soft: #172554;--color-secondary: #34d399;--color-secondary-hover: #10b981;--color-secondary-light: #064e3b;--color-accent: #fbbf24;--color-accent-light: #451a03;--color-danger: #f87171;--color-danger-light: #450a0a;--color-success: #4ade80;--color-success-light: #052e16;--color-bg: #0f172a;--color-bg-card: #1e293b;--color-bg-elevated: #334155;--color-bg-overlay: rgba(0, 0, 0, .6);--color-text: #f1f5f9;--color-text-secondary: #94a3b8;--color-text-muted: #64748b;--color-text-inverse: #0f172a;--color-border: #334155;--color-border-hover: #475569;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .3);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .4), 0 2px 4px -2px rgba(0, 0, 0, .3);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .5), 0 4px 6px -4px rgba(0, 0, 0, .3)}*,*:before,*:after{margin:0;padding:0;box-sizing:border-box}html{font-size:16px;scroll-behavior:smooth;-webkit-text-size-adjust:100%}body{font-family:var(--font-family);font-size:var(--font-size-base);line-height:var(--line-height);color:var(--color-text);background-color:var(--color-bg);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;transition:background-color var(--transition-normal),color var(--transition-normal)}a{color:var(--color-primary);text-decoration:none;transition:color var(--transition-fast)}a:hover{color:var(--color-primary-hover)}img{max-width:100%;height:auto;display:block}button{cursor:pointer;border:none;font-family:inherit;font-size:inherit}input,select,textarea{font-family:inherit;font-size:var(--font-size-base)}h1{font-size:var(--font-size-3xl);font-weight:var(--font-weight-bold);line-height:var(--line-height-tight)}h2{font-size:var(--font-size-2xl);font-weight:var(--font-weight-semibold);line-height:var(--line-height-tight)}h3{font-size:var(--font-size-xl);font-weight:var(--font-weight-semibold)}h4{font-size:var(--font-size-lg);font-weight:var(--font-weight-medium)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--space-sm);padding:var(--space-sm) var(--space-lg);min-height:var(--touch-target);border-radius:var(--border-radius-sm);font-weight:var(--font-weight-medium);font-size:var(--font-size-base);transition:all var(--transition-fast);white-space:nowrap}.btn-primary{background:var(--color-primary);color:var(--color-text-inverse)}.btn-primary:hover{background:var(--color-primary-hover);transform:translateY(-1px);box-shadow:var(--shadow-md)}.btn-secondary{background:transparent;color:var(--color-primary);border:2px solid var(--color-primary)}.btn-secondary:hover{background:var(--color-primary-soft)}.btn-ghost{background:transparent;color:var(--color-text-secondary)}.btn-ghost:hover{background:var(--color-bg-elevated);color:var(--color-text)}.btn-lg{padding:var(--space-md) var(--space-xl);font-size:var(--font-size-lg);min-height:52px}.btn-sm{padding:var(--space-xs) var(--space-md);font-size:var(--font-size-sm);min-height:36px}.btn-full{width:100%}.btn:disabled{opacity:.5;cursor:not-allowed;transform:none}.card{background:var(--color-bg-card);border:1px solid var(--color-border);border-radius:var(--border-radius);padding:var(--space-lg);transition:all var(--transition-normal)}.card:hover{border-color:var(--color-border-hover);box-shadow:var(--shadow-md)}.card-elevated{box-shadow:var(--shadow-md);border:none}.input{width:100%;padding:var(--space-sm) var(--space-md);min-height:var(--touch-target);border:2px solid var(--color-border);border-radius:var(--border-radius-sm);background:var(--color-bg-card);color:var(--color-text);font-size:var(--font-size-base);transition:border-color var(--transition-fast)}.input:focus{outline:none;border-color:var(--color-primary);box-shadow:0 0 0 3px var(--color-primary-light)}.input::placeholder{color:var(--color-text-muted)}.label{display:block;font-size:var(--font-size-sm);font-weight:var(--font-weight-medium);color:var(--color-text-secondary);margin-bottom:var(--space-xs)}.badge{display:inline-flex;align-items:center;padding:var(--space-xs) var(--space-sm);border-radius:var(--border-radius-full);font-size:var(--font-size-xs);font-weight:var(--font-weight-medium)}.badge-primary{background:var(--color-primary-light);color:var(--color-primary)}.badge-success{background:var(--color-success-light);color:var(--color-success)}.badge-accent{background:var(--color-accent-light);color:var(--color-accent)}.badge-danger{background:var(--color-danger-light);color:var(--color-danger)}.container{max-width:var(--max-width);margin:0 auto;padding:0 var(--space-lg)}.page{min-height:calc(100vh - var(--header-height));padding-top:var(--space-xl);padding-bottom:var(--space-3xl)}.progress-bar{width:100%;height:8px;background:var(--color-bg-elevated);border-radius:var(--border-radius-full);overflow:hidden}.progress-bar-fill{height:100%;background:linear-gradient(90deg,var(--color-primary),var(--color-secondary));border-radius:var(--border-radius-full);transition:width var(--transition-slow)}@keyframes fadeIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}@keyframes slideUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}@keyframes pulse{0%,to{opacity:1}50%{opacity:.5}}.animate-fade-in{animation:fadeIn .4s ease-out}.animate-slide-up{animation:slideUp .5s ease-out}.animate-pulse{animation:pulse 2s infinite}@media(max-width:768px){:root{--space-lg: 1rem;--space-xl: 1.5rem}h1{font-size:var(--font-size-2xl)}h2{font-size:var(--font-size-xl)}}.header{position:fixed;top:0;left:0;right:0;height:var(--header-height);background:var(--color-bg-card);border-bottom:1px solid var(--color-border);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);z-index:var(--z-dropdown);transition:background var(--transition-normal),border-color var(--transition-normal)}.header-inner{display:flex;align-items:center;justify-content:space-between;height:100%;gap:var(--space-lg)}.header-logo{display:flex;align-items:center;gap:var(--space-sm);font-size:var(--font-size-xl);font-weight:var(--font-weight-bold);color:var(--color-text);text-decoration:none}.logo-icon{font-size:1.5rem}.header-nav{display:flex;align-items:center;gap:var(--space-xs)}.nav-link{display:flex;align-items:center;gap:var(--space-xs);padding:var(--space-sm) var(--space-md);border-radius:var(--border-radius-sm);color:var(--color-text-secondary);font-size:var(--font-size-sm);font-weight:var(--font-weight-medium);text-decoration:none;min-height:var(--touch-target);transition:all var(--transition-fast)}.nav-link:hover{background:var(--color-bg-elevated);color:var(--color-text)}.nav-link.active{background:var(--color-primary-soft);color:var(--color-primary)}.nav-icon{font-size:1.1rem}.header-actions{display:flex;align-items:center;gap:var(--space-md)}.lang-switcher{display:flex;gap:2px;background:var(--color-bg-elevated);border-radius:var(--border-radius-sm);padding:2px}.lang-btn{padding:var(--space-xs) var(--space-sm);border-radius:6px;font-size:var(--font-size-xs);font-weight:var(--font-weight-semibold);color:var(--color-text-muted);background:transparent;min-height:32px;min-width:36px;transition:all var(--transition-fast)}.lang-btn:hover{color:var(--color-text)}.lang-btn.active{background:var(--color-bg-card);color:var(--color-primary);box-shadow:var(--shadow-sm)}.theme-toggle{width:40px;height:40px;display:flex;align-items:center;justify-content:center;border-radius:var(--border-radius-sm);background:transparent;font-size:1.2rem;transition:background var(--transition-fast)}.theme-toggle:hover{background:var(--color-bg-elevated)}@media(max-width:768px){.header-nav{display:none}.nav-link span:last-child{display:none}}.auth-page{display:flex;align-items:center;justify-content:center;min-height:calc(100vh - var(--header-height));padding:var(--space-lg)}.auth-container{width:100%;max-width:440px}.auth-header{text-align:center;margin-bottom:var(--space-xl)}.auth-logo-icon{width:64px;height:64px;border-radius:16px;background:linear-gradient(135deg,var(--color-primary),var(--color-secondary));color:#fff;display:flex;align-items:center;justify-content:center;margin:0 auto var(--space-md)}.auth-header h1{margin-bottom:var(--space-sm)}.auth-subtitle{color:var(--color-text-secondary);font-size:var(--font-size-lg)}.auth-form{background:var(--color-bg-card);border:1px solid var(--color-border);border-radius:var(--border-radius-lg);padding:var(--space-xl);box-shadow:var(--shadow-lg)}.auth-error{background:#fef2f2;border:1px solid #fca5a5;color:#dc2626;padding:var(--space-sm) var(--space-md);border-radius:var(--border-radius-sm);font-size:var(--font-size-sm);margin-bottom:var(--space-md)}[data-theme=dark] .auth-error{background:#451a1a;border-color:#991b1b;color:#fca5a5}.form-group{margin-bottom:var(--space-lg)}.forgot-link{display:inline-block;margin-top:var(--space-xs);font-size:var(--font-size-sm);color:var(--color-primary)}.auth-divider{display:flex;align-items:center;gap:var(--space-md);margin:var(--space-lg) 0;color:var(--color-text-muted);font-size:var(--font-size-sm)}.auth-divider:before,.auth-divider:after{content:"";flex:1;height:1px;background:var(--color-border)}.google-btn{display:flex;align-items:center;gap:var(--space-sm)}.google-btn svg{flex-shrink:0}.auth-footer{text-align:center;margin-top:var(--space-lg);color:var(--color-text-secondary);font-size:var(--font-size-base)}.auth-footer a{font-weight:var(--font-weight-semibold)}.onboarding-page{display:flex;align-items:center;justify-content:center;min-height:calc(100vh - var(--header-height));padding:var(--space-lg)}.onboarding-container{width:100%;max-width:600px}.onboarding-header{text-align:center;margin-bottom:var(--space-xl)}.onboarding-header p{color:var(--color-text-secondary);font-size:var(--font-size-lg);margin-top:var(--space-sm)}.onboarding-progress{margin-bottom:var(--space-xl)}.step-indicator{display:block;text-align:center;margin-top:var(--space-sm);font-size:var(--font-size-sm);color:var(--color-text-muted)}.step-content h2{text-align:center;margin-bottom:var(--space-xl)}.option-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:var(--space-md)}.option-grid.three-col{grid-template-columns:repeat(3,1fr)}.option-grid.two-col{grid-template-columns:repeat(2,1fr)}.option-card{display:flex;flex-direction:column;align-items:center;gap:var(--space-sm);padding:var(--space-lg);background:var(--color-bg-card);border:2px solid var(--color-border);border-radius:var(--border-radius);cursor:pointer;transition:all var(--transition-fast);font-size:var(--font-size-base);font-weight:var(--font-weight-medium);color:var(--color-text);min-height:var(--touch-target)}.option-card:hover{border-color:var(--color-primary);background:var(--color-primary-soft)}.option-card.selected{border-color:var(--color-primary);background:var(--color-primary-light);box-shadow:0 0 0 3px var(--color-primary-light)}.option-card.large{padding:var(--space-xl)}.option-icon{display:flex;align-items:center;justify-content:center;color:var(--color-primary)}.option-list{display:flex;flex-direction:column;gap:var(--space-sm)}.option-row{display:flex;align-items:center;gap:var(--space-md);padding:var(--space-md) var(--space-lg);background:var(--color-bg-card);border:2px solid var(--color-border);border-radius:var(--border-radius-sm);cursor:pointer;transition:all var(--transition-fast);font-size:var(--font-size-lg);color:var(--color-text);min-height:var(--touch-target)}.option-row:hover{border-color:var(--color-primary)}.option-row.selected{border-color:var(--color-primary);background:var(--color-primary-light)}.option-dot{width:20px;height:20px;border-radius:50%;border:2px solid var(--color-border);flex-shrink:0;transition:all var(--transition-fast)}.option-row.selected .option-dot{border-color:var(--color-primary);background:var(--color-primary);box-shadow:inset 0 0 0 3px var(--color-bg-card)}.onboarding-actions{display:flex;align-items:center;margin-top:var(--space-xl)}@media(max-width:768px){.option-grid.three-col{grid-template-columns:repeat(2,1fr)}}.dashboard{max-width:800px;margin:0 auto}.greeting-section{display:flex;align-items:center;justify-content:space-between;margin-bottom:var(--space-xl);flex-wrap:wrap;gap:var(--space-md)}.streak-fire{display:inline-flex;align-items:center;gap:var(--space-xs);font-size:var(--font-size-lg);font-weight:var(--font-weight-bold);color:var(--color-accent)}.stats-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--space-md);margin-bottom:var(--space-xl)}.stat-card{display:flex;align-items:center;gap:var(--space-md);padding:var(--space-lg)}.stat-icon-wrapper{width:48px;height:48px;border-radius:var(--border-radius-sm);display:flex;align-items:center;justify-content:center;flex-shrink:0}.stat-icon-flame{background:var(--color-accent-light);color:var(--color-accent)}.stat-icon-level{background:var(--color-success-light);color:var(--color-success)}.stat-icon-progress{background:var(--color-primary-light);color:var(--color-primary)}.stat-value{font-size:var(--font-size-xl);font-weight:var(--font-weight-bold);text-transform:capitalize}.stat-label{font-size:var(--font-size-sm);color:var(--color-text-secondary)}.action-buttons{display:flex;gap:var(--space-md);margin-bottom:var(--space-xl)}.action-buttons .btn{flex:1;justify-content:center}.recent-section{margin-bottom:var(--space-xl)}.recent-section h2{margin-bottom:var(--space-md)}.session-list{display:flex;flex-direction:column;gap:var(--space-sm)}.session-card{display:flex;align-items:center;justify-content:space-between;padding:var(--space-md) var(--space-lg)}.session-context{display:flex;align-items:center;gap:var(--space-sm);font-weight:var(--font-weight-medium);font-size:var(--font-size-lg)}.session-icon{display:flex;align-items:center;color:var(--color-text-muted)}.session-meta{display:flex;align-items:center;gap:var(--space-md)}.session-date{font-size:var(--font-size-sm);color:var(--color-text-muted)}.upgrade-card{display:flex;align-items:center;justify-content:space-between;background:linear-gradient(135deg,var(--color-primary-soft),var(--color-secondary-light));border:1px solid var(--color-primary-light);gap:var(--space-lg)}.upgrade-title-row{display:flex;align-items:center;gap:var(--space-sm);color:var(--color-accent);margin-bottom:var(--space-xs)}.upgrade-title-row h3{color:var(--color-text)}.upgrade-content p{color:var(--color-text-secondary)}@media(max-width:768px){.stats-grid{grid-template-columns:1fr}.action-buttons{flex-direction:column}.upgrade-card{flex-direction:column;text-align:center}}.lessons{max-width:800px;margin:0 auto}.lessons h1{margin-bottom:var(--space-sm)}.lessons-subtitle{color:var(--color-text-secondary);font-size:var(--font-size-lg);margin-bottom:var(--space-xl)}.lessons-grid{display:flex;flex-direction:column;gap:var(--space-md);margin-bottom:var(--space-xl)}.lesson-card{display:flex;align-items:center;gap:var(--space-lg);padding:var(--space-lg);cursor:pointer;text-align:left;background:var(--color-bg-card)}.lesson-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg)}.lesson-icon-wrapper{width:52px;height:52px;border-radius:var(--border-radius);display:flex;align-items:center;justify-content:center;flex-shrink:0}.lesson-info{flex:1}.lesson-info h3{margin-bottom:var(--space-xs)}.lesson-meta{display:flex;gap:var(--space-sm)}.lesson-action{flex-shrink:0}.free-limit-info{display:flex;align-items:center;gap:var(--space-md);background:var(--color-accent-light);border-color:var(--color-accent)}.limit-icon-wrapper{width:40px;height:40px;border-radius:50%;background:var(--color-accent);color:#fff;display:flex;align-items:center;justify-content:center;flex-shrink:0}.limit-desc{font-size:var(--font-size-sm);color:var(--color-text-secondary);margin-top:var(--space-xs)}@media(max-width:768px){.free-limit-info{flex-direction:column;text-align:center}}.lesson{max-width:680px;margin:0 auto}.lesson-loading{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:50vh;gap:var(--space-md);color:var(--text-secondary)}.lesson-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:var(--space-md)}.lesson-context-label{display:flex;align-items:center;gap:var(--space-xs);font-weight:600;color:var(--text-primary)}.ai-badge{display:inline-flex;align-items:center;gap:2px;font-size:.7rem;font-weight:700;color:#8b5cf6;background:color-mix(in srgb,#8b5cf6 12%,var(--bg-primary));padding:2px 6px;border-radius:999px;letter-spacing:.03em}.lesson-progress-text{font-size:.875rem;color:var(--text-secondary);font-weight:600}.progress-bar{height:6px;background:var(--bg-secondary);border-radius:999px;margin-bottom:var(--space-lg);overflow:hidden}.progress-fill{height:100%;background:var(--color-primary);border-radius:999px;transition:width .4s ease}.exercise-card{padding:var(--space-xl)}.exercise-type-badge{display:inline-block;font-size:.75rem;font-weight:600;text-transform:uppercase;letter-spacing:.05em;color:var(--color-primary);background:var(--bg-secondary);padding:var(--space-xs) var(--space-sm);border-radius:var(--radius-sm);margin-bottom:var(--space-md)}.exercise-question{font-size:1.25rem;font-weight:600;line-height:1.5;margin-bottom:var(--space-lg);color:var(--text-primary)}.exercise-answer-area{display:flex;flex-direction:column;gap:var(--space-md)}.options-grid{display:flex;flex-direction:column;gap:var(--space-sm)}.option-btn{display:flex;align-items:center;gap:var(--space-md);padding:var(--space-md) var(--space-lg);border:2px solid var(--border-color);border-radius:var(--radius-md);background:var(--bg-primary);color:var(--text-primary);font-size:1rem;text-align:left;cursor:pointer;transition:all .2s ease}.option-btn:hover{border-color:var(--color-primary);background:color-mix(in srgb,var(--color-primary) 5%,var(--bg-primary));transform:translate(4px)}.option-letter{display:flex;align-items:center;justify-content:center;width:28px;height:28px;border-radius:50%;background:var(--bg-secondary);font-weight:700;font-size:.8rem;color:var(--text-secondary);flex-shrink:0}.answer-input{width:100%;padding:var(--space-md) var(--space-lg);border:2px solid var(--border-color);border-radius:var(--radius-md);background:var(--bg-primary);color:var(--text-primary);font-size:1.1rem;transition:border-color .2s}.answer-input:focus{outline:none;border-color:var(--color-primary)}.hint-btn{display:flex;align-items:center;gap:var(--space-xs);border:none;background:none;color:var(--color-warning);font-size:.875rem;cursor:pointer;padding:var(--space-xs) 0}.hint-btn:hover{opacity:.8}.feedback-area{display:flex;flex-direction:column;gap:var(--space-md);margin-top:var(--space-md);padding:var(--space-lg);border-radius:var(--radius-md);animation:slideUp .3s ease}.feedback-area.correct{background:color-mix(in srgb,var(--color-success) 10%,var(--bg-primary));border:2px solid var(--color-success)}.feedback-area.incorrect{background:color-mix(in srgb,var(--color-accent) 10%,var(--bg-primary));border:2px solid var(--color-accent)}.feedback-header{display:flex;align-items:center;gap:var(--space-sm);font-size:1.1rem;font-weight:700}.feedback-area.correct .feedback-header{color:var(--color-success)}.feedback-area.incorrect .feedback-header{color:var(--color-accent)}.correct-answer-display{padding:var(--space-sm) var(--space-md);background:var(--bg-secondary);border-radius:var(--radius-sm);font-size:.95rem;color:var(--text-secondary)}.explanation{display:flex;gap:var(--space-sm);padding:var(--space-md);background:color-mix(in srgb,var(--color-primary) 8%,var(--bg-primary));border-radius:var(--radius-sm);color:var(--text-primary);line-height:1.6}.explanation svg{flex-shrink:0;color:var(--color-primary);margin-top:2px}.explanation p{margin:0;font-size:.9rem}.results-card{text-align:center;padding:var(--space-2xl)}.results-emoji{font-size:4rem;margin-bottom:var(--space-md)}.results-card h2{font-size:1.5rem;margin-bottom:var(--space-xs)}.results-context{color:var(--text-secondary);margin-bottom:var(--space-lg)}.results-score{display:flex;align-items:center;justify-content:center;gap:var(--space-md);margin-bottom:var(--space-lg)}.score-number{font-size:3rem;font-weight:800;color:var(--color-primary)}.results-stats{display:flex;justify-content:center;gap:var(--space-xl);margin-bottom:var(--space-xl)}.stat-item{display:flex;align-items:center;gap:var(--space-xs);font-weight:600}.stat-item.correct{color:var(--color-success)}.stat-item.incorrect{color:var(--color-accent)}.results-actions{display:flex;flex-direction:column;gap:var(--space-sm)}@keyframes slideUp{0%{opacity:0;transform:translateY(12px)}to{opacity:1;transform:translateY(0)}}.chat-page{height:calc(100vh - var(--header-height));display:flex;justify-content:center;padding:var(--space-md)}.chat-container{width:100%;max-width:800px;display:flex;flex-direction:column;background:var(--color-bg-card);border:1px solid var(--color-border);border-radius:var(--border-radius-lg);overflow:hidden}.chat-header{display:flex;align-items:center;justify-content:space-between;padding:var(--space-md) var(--space-lg);border-bottom:1px solid var(--color-border)}.chat-header-left{display:flex;align-items:center;gap:var(--space-sm);color:var(--color-primary)}.chat-messages{flex:1;overflow-y:auto;padding:var(--space-lg);display:flex;flex-direction:column;gap:var(--space-md)}.message{display:flex;align-items:flex-start;gap:var(--space-sm);max-width:85%}.message.user{align-self:flex-end;flex-direction:row-reverse}.message-avatar{width:36px;height:36px;border-radius:50%;display:flex;align-items:center;justify-content:center;flex-shrink:0}.message-avatar.assistant{background:var(--color-primary-light);color:var(--color-primary)}.message-avatar.user{background:var(--color-bg-elevated);color:var(--color-text-secondary)}.message-bubble{padding:var(--space-md);border-radius:var(--border-radius);font-size:var(--font-size-base);line-height:var(--line-height)}.message.assistant .message-bubble{background:var(--color-bg-elevated);color:var(--color-text);border-bottom-left-radius:4px}.message-bubble p{margin:0 0 4px}.message-bubble p:last-child{margin-bottom:0}.message-bubble strong{font-weight:700;color:var(--color-primary)}.message-bubble code{background:var(--color-bg);padding:1px 5px;border-radius:4px;font-size:.9em;font-family:JetBrains Mono,monospace}.chat-list-item{padding-left:1em;margin:2px 0!important}.chat-list-item.numbered{padding-left:.5em}.chat-example{padding-left:1.5em;color:var(--color-text-secondary);font-style:italic;margin:2px 0 6px!important}.message.user .message-bubble{background:var(--color-primary);color:#fff;border-bottom-right-radius:4px}.message-bubble.thinking{display:flex;gap:4px;padding:var(--space-md) var(--space-lg)}.dot{width:8px;height:8px;background:var(--color-text-muted);border-radius:50%;animation:bounce 1.4s infinite ease-in-out}.dot:nth-child(1){animation-delay:0s}.dot:nth-child(2){animation-delay:.2s}.dot:nth-child(3){animation-delay:.4s}@keyframes bounce{0%,80%,to{transform:scale(.6);opacity:.4}40%{transform:scale(1);opacity:1}}.chat-input-area{display:flex;gap:var(--space-sm);padding:var(--space-md) var(--space-lg);border-top:1px solid var(--color-border);background:var(--color-bg)}.chat-input{flex:1;padding:var(--space-sm) var(--space-md);border:2px solid var(--color-border);border-radius:var(--border-radius-sm);background:var(--color-bg-card);color:var(--color-text);font-size:var(--font-size-base);font-family:inherit;resize:none;min-height:var(--touch-target)}.chat-input:focus{outline:none;border-color:var(--color-primary)}.chat-send{flex-shrink:0;min-width:80px}.profile{max-width:700px;margin:0 auto}.profile h1,.profile-card{margin-bottom:var(--space-xl)}.profile-header{display:flex;align-items:center;gap:var(--space-lg);margin-bottom:var(--space-lg)}.profile-avatar{width:72px;height:72px;border-radius:50%;background:linear-gradient(135deg,var(--color-primary),var(--color-secondary));color:#fff;display:flex;align-items:center;justify-content:center;font-size:var(--font-size-2xl);font-weight:var(--font-weight-bold);flex-shrink:0}.profile-info h2{margin-bottom:var(--space-xs)}.profile-email{color:var(--color-text-secondary);margin-bottom:var(--space-sm)}.profile-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--space-md);padding-top:var(--space-lg);border-top:1px solid var(--color-border)}.profile-stat{text-align:center}.profile-stat-icon{width:36px;height:36px;border-radius:50%;display:flex;align-items:center;justify-content:center;margin:0 auto var(--space-xs)}.stat-flame{background:var(--color-accent-light);color:var(--color-accent)}.stat-sessions{background:var(--color-primary-light);color:var(--color-primary)}.stat-exercises{background:var(--color-success-light);color:var(--color-success)}.profile-stat-value{font-size:var(--font-size-xl);font-weight:var(--font-weight-bold);margin-bottom:var(--space-xs)}.profile-stat-label{font-size:var(--font-size-sm);color:var(--color-text-secondary)}.settings-section{margin-bottom:var(--space-xl)}.settings-section h3{margin-bottom:var(--space-md)}.lang-options{display:flex;gap:var(--space-sm);flex-wrap:wrap}.profile-details{padding:var(--space-md) var(--space-lg)}.detail-row{display:flex;justify-content:space-between;align-items:center;padding:var(--space-sm) 0}.detail-row+.detail-row{border-top:1px solid var(--color-border)}.detail-label{display:flex;align-items:center;gap:var(--space-sm);color:var(--color-text-secondary)}.detail-value{font-weight:var(--font-weight-medium);text-transform:capitalize}.profile-select{padding:var(--space-xs) var(--space-sm);border:2px solid var(--color-border);border-radius:var(--border-radius-sm);background:var(--color-bg);color:var(--color-text);font-size:var(--font-size-base);min-width:160px;cursor:pointer}.profile-select:focus{outline:none;border-color:var(--color-primary)}.profile-edit-actions{display:flex;gap:var(--space-sm);margin-top:var(--space-md);padding-top:var(--space-md);border-top:1px solid var(--color-border)}@media(max-width:768px){.profile-stats{grid-template-columns:1fr}.lang-options{flex-direction:column}}.main-content{margin-top:var(--header-height)}.loading-screen{display:flex;align-items:center;justify-content:center;min-height:calc(100vh - var(--header-height))}@keyframes spin{to{transform:rotate(360deg)}}.spinner{animation:spin 1s linear infinite}