.user-menu{position:relative}.user-menu__trigger{display:inline-flex;align-items:center;gap:.55rem;height:2.5rem;padding:.35rem .6rem .35rem .4rem;border:1px solid var(--border);border-radius:999px;background:var(--card-bg);color:var(--text);cursor:pointer;font-size:var(--text-sm);font-family:inherit;font-weight:600;box-shadow:var(--shadow-sm);transition:border-color var(--transition-fast) ease,box-shadow var(--transition-fast) ease}.user-menu__trigger:hover{border-color:color-mix(in srgb,var(--primary) 45%,var(--border));box-shadow:var(--shadow-md)}.user-menu__avatar{display:inline-flex;align-items:center;justify-content:center;width:2rem;height:2rem;border-radius:999px;background:linear-gradient(140deg,var(--primary),var(--primary-700));color:#fff;font-size:var(--text-xs);font-weight:700;text-transform:uppercase;flex-shrink:0;overflow:hidden}.user-menu__avatar-image{width:100%;height:100%;border-radius:50%;object-fit:cover;display:block}.user-menu__avatar--large{width:2.6rem;height:2.6rem;font-size:var(--text-base)}.user-menu__name{max-width:10rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.user-menu__chevron{color:var(--text-secondary);line-height:0;transform:rotate(0);transition:transform var(--transition-fast) ease}.user-menu__chevron.is-open{transform:rotate(180deg)}.user-menu__dropdown{position:absolute;right:0;top:calc(100% + .55rem);width:min(19rem,90vw);border:1px solid var(--border);border-radius:var(--radius-lg);background:var(--card-bg);box-shadow:var(--shadow-xl);padding:.75rem;z-index:70}.user-menu__header{display:flex;align-items:center;gap:.7rem;padding:.4rem;border-radius:var(--radius-md);background:color-mix(in srgb,var(--bg) 65%,var(--card-bg));margin-bottom:.55rem}.user-menu__identity{min-width:0}.user-menu__identity-name,.user-menu__identity-email{margin:0;line-height:1.35;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.user-menu__identity-name{color:var(--text);font-size:var(--text-sm);font-weight:700}.user-menu__identity-email{color:var(--text-secondary);font-size:var(--text-xs)}.user-menu__items{display:grid;gap:.3rem}.user-menu__item{width:100%;display:inline-flex;align-items:center;gap:.55rem;border:none;border-radius:var(--radius-md);background:transparent;color:var(--text);text-decoration:none;font-family:inherit;font-size:var(--text-sm);font-weight:500;cursor:pointer;padding:.55rem .6rem}.user-menu__item:hover{background:color-mix(in srgb,var(--primary-light) 72%,var(--card-bg));color:var(--primary)}.user-menu__divider{border:0;border-top:1px solid var(--border);margin:.55rem 0}.user-menu__item--danger:hover{background:color-mix(in srgb,var(--danger-100) 74%,var(--card-bg));color:var(--danger-700)}[data-theme=dark] .user-menu__item--danger:hover{color:var(--danger-400)}@media(max-width:768px){.user-menu__name{max-width:6.5rem}.user-menu__dropdown{width:min(17rem,92vw)}}:root{--bg: #f8fafc;--card-bg: #ffffff;--text: #1e293b;--text-secondary: #64748b;--border: #e2e8f0;--bauhaus-red: #e63946;--bauhaus-blue: #2878ff;--bauhaus-yellow: #ffbf1f;--bauhaus-ink: #111111;--bauhaus-paper: #fff9ed;--primary-50: #eff6ff;--primary-100: #dbeafe;--primary-200: #bfdbfe;--primary-300: #93c5fd;--primary-400: #60a5fa;--primary-500: #3b82f6;--primary-600: #2563eb;--primary-700: #1d4ed8;--primary-800: #1e40af;--primary-900: #1e3a8a;--success-50: #ecfdf5;--success-100: #d1fae5;--success-200: #a7f3d0;--success-300: #6ee7b7;--success-400: #34d399;--success-500: #10b981;--success-600: #059669;--success-700: #047857;--success-800: #065f46;--success-900: #064e3b;--danger-50: #fef2f2;--danger-100: #fee2e2;--danger-200: #fecaca;--danger-300: #fca5a5;--danger-400: #f87171;--danger-500: #ef4444;--danger-600: #dc2626;--danger-700: #b91c1c;--danger-800: #991b1b;--danger-900: #7f1d1d;--warning-50: #fffbeb;--warning-100: #fef3c7;--warning-200: #fde68a;--warning-300: #fcd34d;--warning-400: #fbbf24;--warning-500: #f59e0b;--warning-600: #d97706;--warning-700: #b45309;--warning-800: #92400e;--warning-900: #78350f;--neutral-50: #f8fafc;--neutral-100: #f1f5f9;--neutral-200: #e2e8f0;--neutral-300: #cbd5e1;--neutral-400: #94a3b8;--neutral-500: #64748b;--neutral-600: #475569;--neutral-700: #334155;--neutral-800: #1e293b;--neutral-900: #0f172a;--primary: #3b82f6;--primary-light: #dbeafe;--primary-dark: #2563eb;--success: #10b981;--warning: #f59e0b;--danger: #ef4444;--space-1: .25rem;--space-2: .5rem;--space-3: .75rem;--space-4: 1rem;--space-5: 1.25rem;--space-6: 1.5rem;--space-8: 2rem;--space-10: 2.5rem;--space-12: 3rem;--space-14: 3.5rem;--space-16: 4rem;--space-20: 5rem;--space-24: 6rem;--shadow-sm: 0 1px 2px 0 rgba(15, 23, 42, .06);--shadow-md: 0 4px 6px -1px rgba(15, 23, 42, .12);--shadow-lg: 0 10px 15px -3px rgba(15, 23, 42, .12);--shadow-xl: 0 20px 25px -5px rgba(15, 23, 42, .12);--shadow-2xl: 0 25px 50px -12px rgba(15, 23, 42, .3);--shadow: 0 1px 3px rgba(0,0,0,.1);--radius-sm: .375rem;--radius-md: .5rem;--radius-lg: .75rem;--radius-xl: 1rem;--radius-2xl: 1.5rem;--radius-3xl: 2rem;--text-xs: .75rem;--text-sm: .875rem;--text-base: 1rem;--text-lg: 1.125rem;--text-xl: 1.25rem;--text-2xl: 1.5rem;--text-3xl: 1.875rem;--text-4xl: 2.25rem;--transition-fast: .15s;--transition-normal: .2s;--transition-slow: .3s;--header-height: 60px;--sidebar-width: 250px}[data-theme=dark]{--primary-50: #172554;--primary-100: #1e3a8a;--primary-200: #1e40af;--primary-300: #1d4ed8;--primary-400: #2563eb;--primary-500: #3b82f6;--primary-600: #60a5fa;--primary-700: #93c5fd;--primary-800: #bfdbfe;--primary-900: #dbeafe;--success-50: #022c22;--success-100: #064e3b;--success-200: #065f46;--success-300: #047857;--success-400: #059669;--success-500: #10b981;--success-600: #34d399;--success-700: #6ee7b7;--success-800: #a7f3d0;--success-900: #d1fae5;--danger-50: #450a0a;--danger-100: #7f1d1d;--danger-200: #991b1b;--danger-300: #b91c1c;--danger-400: #dc2626;--danger-500: #ef4444;--danger-600: #f87171;--danger-700: #fca5a5;--danger-800: #fecaca;--danger-900: #fee2e2;--warning-50: #451a03;--warning-100: #78350f;--warning-200: #92400e;--warning-300: #b45309;--warning-400: #d97706;--warning-500: #f59e0b;--warning-600: #fbbf24;--warning-700: #fcd34d;--warning-800: #fde68a;--warning-900: #fef3c7;--neutral-50: #020617;--neutral-100: #0f172a;--neutral-200: #1e293b;--neutral-300: #334155;--neutral-400: #475569;--neutral-500: #64748b;--neutral-600: #94a3b8;--neutral-700: #cbd5e1;--neutral-800: #e2e8f0;--neutral-900: #f1f5f9;--bg: #0b1220;--card-bg: rgba(30, 41, 59, .72);--card-bg-solid: #1e293b;--glass-surface: rgba(30, 41, 59, .62);--glass-surface-strong: rgba(30, 41, 59, .78);--glass-border: rgba(148, 163, 184, .36);--glass-blur: 14px;--shadow-glass: 0 18px 36px -22px rgba(2, 6, 23, .92);--glow-primary-soft: 0 0 0 1px rgba(96, 165, 250, .26), 0 0 0 6px rgba(59, 130, 246, .07);--glow-primary-hover: 0 0 0 1px rgba(125, 211, 252, .44), 0 0 24px rgba(59, 130, 246, .34);--text: #f1f5f9;--text-secondary: #c4d4ec;--border: #5e7392;--bauhaus-red: #ff6b6b;--bauhaus-blue: #77a7ff;--bauhaus-yellow: #ffd166;--bauhaus-ink: #f8fafc;--bauhaus-paper: #253147;--primary: var(--primary-500);--primary-light: #1e3a5f;--primary-dark: #60a5fa;--success: var(--success-500);--warning: var(--warning-500);--danger: var(--danger-500);--shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, .35);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .45);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .5);--shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, .55);--shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, .65);--shadow: 0 1px 3px rgba(0,0,0,.4)}[data-theme=dark] .course-card,[data-theme=dark] .lesson-card,[data-theme=dark] .lesson-info,[data-theme=dark] .focus-item,[data-theme=dark] .vocab-card,[data-theme=dark] .doc-link,[data-theme=dark] .video-link,[data-theme=dark] .section-toggle,[data-theme=dark] .page-hero,[data-theme=dark] .outcomes-list li,[data-theme=dark] .grammar-item{background:var(--glass-surface);border-color:var(--glass-border);box-shadow:var(--shadow-glass),var(--glow-primary-soft);backdrop-filter:blur(var(--glass-blur));-webkit-backdrop-filter:blur(var(--glass-blur))}[data-theme=dark] .course-card:hover,[data-theme=dark] .lesson-card:hover,[data-theme=dark] .doc-link:hover,[data-theme=dark] .section-toggle:hover,[data-theme=dark] .video-link:hover{box-shadow:var(--shadow-glass),var(--glow-primary-hover);border-color:color-mix(in srgb,var(--primary) 58%,var(--glass-border))}[data-theme=dark] .lesson-card:nth-child(2n),[data-theme=dark] .lesson-detail{background:var(--glass-surface-strong)}*{box-sizing:border-box;margin:0;padding:0}body{font-family:Inter,sans-serif;background:var(--bg);color:var(--text);line-height:1.6;min-height:100vh}.app-layout{display:flex;min-height:100vh}.app-sidebar{width:var(--sidebar-width);background:var(--card-bg);border-right:1px solid var(--border);position:fixed;height:100vh;left:0;top:0;overflow-y:auto;transition:transform .3s cubic-bezier(.4,0,.2,1);z-index:50;display:flex;flex-direction:column}.sidebar-header{height:var(--header-height);padding:0 1.25rem;display:flex;align-items:center;border-bottom:1px solid var(--border)}.sidebar-brand{display:flex;align-items:center;gap:.75rem}.sidebar-logo{display:flex;align-items:center;flex-shrink:0}.sidebar-title{font-size:.85rem;font-weight:800;color:var(--text);letter-spacing:.08em;text-decoration:none}.sidebar-nav{padding:1rem .75rem;display:flex;flex-direction:column;gap:.25rem;flex:1}.sidebar-footer{padding:.75rem;border-top:1px solid var(--border);margin-top:auto}.nav-section-label{font-size:.7rem;font-weight:600;text-transform:uppercase;letter-spacing:.08em;color:var(--text-secondary);padding:0 .75rem;margin-bottom:.5rem;opacity:.6}.nav-link{display:flex;align-items:center;gap:.75rem;padding:.625rem .75rem;color:var(--text-secondary);text-decoration:none;border-left:3px solid transparent;border-radius:.5rem;font-weight:500;font-size:.9rem;transition:all .15s ease}.nav-icon{flex-shrink:0;opacity:.7;transition:opacity .15s ease}.nav-link:hover{background:var(--primary-light);color:var(--primary);border-left-color:color-mix(in srgb,var(--primary) 45%,transparent)}.nav-link:hover .nav-icon{opacity:1}.nav-link.active{background:color-mix(in srgb,var(--primary) 16%,transparent);color:var(--primary);border-left-color:var(--primary)}.nav-link.active .nav-icon{opacity:1}.mobile-nav{position:fixed;left:0;right:0;bottom:0;height:4.25rem;padding:.5rem .75rem calc(.5rem + env(safe-area-inset-bottom));background:color-mix(in srgb,var(--card-bg) 92%,var(--bg));border-top:1px solid var(--border);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);display:none;align-items:center;justify-content:space-between;gap:.5rem;z-index:55}.mobile-nav-link{flex:1;min-width:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:.2rem;text-decoration:none;color:var(--text-secondary);font-size:.72rem;font-weight:600;border-radius:.65rem;padding:.35rem .25rem;transition:color var(--transition-fast) ease,background var(--transition-fast) ease}.mobile-nav-link:hover{color:var(--primary);background:color-mix(in srgb,var(--primary-light) 75%,transparent)}.mobile-nav-link.active{color:var(--primary);background:color-mix(in srgb,var(--primary-light) 86%,var(--card-bg))}.mobile-nav-icon{display:inline-flex;line-height:0}.mobile-nav-label{white-space:nowrap}.main-wrapper{flex:1;margin-left:var(--sidebar-width);min-height:100vh;display:flex;flex-direction:column;width:calc(100% - var(--sidebar-width))}.app-header{height:var(--header-height);border-bottom:1px solid var(--border);padding:0 1.5rem;display:flex;align-items:center;justify-content:space-between;position:sticky;top:0;z-index:40;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);background:color-mix(in srgb,var(--card-bg) 85%,transparent)}.header-left{display:flex;align-items:center;gap:.75rem}.header-actions{display:flex;align-items:center;gap:.5rem}.mobile-menu-btn{display:none;background:none;border:none;cursor:pointer;color:var(--text-secondary);padding:.375rem;border-radius:.375rem;transition:all .15s ease;line-height:0}.mobile-menu-btn:hover{background:var(--primary-light);color:var(--primary)}.theme-toggle{background:var(--bg);border:1px solid var(--border);padding:.5rem;border-radius:.5rem;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .15s ease;color:var(--text-secondary);line-height:0}.theme-toggle:hover{background:var(--primary-light);border-color:var(--primary);color:var(--primary)}button,[role=button]{transition:transform var(--transition-normal) ease,box-shadow var(--transition-normal) ease,border-color var(--transition-normal) ease,background-color var(--transition-normal) ease,color var(--transition-normal) ease}button:hover:not(:disabled),[role=button]:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg)}.page-content{padding:1.5rem;flex:1;max-width:1200px;width:100%;margin:0 auto;animation:pageFade var(--transition-normal) ease-out}@keyframes pageFade{0%{opacity:0}to{opacity:1}}h1,h2,h3,h4,h5,h6{color:var(--text);margin-bottom:.5rem}p{color:var(--text-secondary);margin-bottom:1rem}@media(max-width:768px){.app-sidebar{transform:translate(-100%)}.app-sidebar.open{transform:translate(0)}.main-wrapper{margin-left:0;width:100%}.mobile-menu-btn{display:block}.sidebar-overlay{display:none;position:fixed;top:0;left:var(--sidebar-width);right:0;bottom:0;background:#00000080;z-index:51;border:none;padding:0;margin:0;cursor:pointer;-webkit-appearance:none;appearance:none}.sidebar-overlay.open{display:block}}@media(max-width:767px){.mobile-nav{display:flex}.page-content{padding-bottom:6rem}}.stat{display:flex;align-items:center;gap:.35rem;font-size:.85rem}.stat-value{font-weight:700;color:var(--primary)}.stat-label{font-size:.75rem;color:var(--text-secondary)}.course-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:1.5rem;margin-bottom:2rem}.course-card{background:var(--card-bg);border-radius:1rem;box-shadow:var(--shadow);overflow:hidden;border:1px solid var(--border);transition:all .2s ease;position:relative;text-decoration:none;display:block;color:inherit}.course-card:hover{transform:scale(1.02);box-shadow:var(--shadow-lg);border-color:var(--primary)}.course-header{padding:1.5rem;background:linear-gradient(to right,var(--bg),var(--card-bg));border-bottom:1px solid var(--border)}.course-title{font-size:1.25rem;font-weight:700;margin-bottom:.5rem;color:var(--primary)}.course-subtitle{font-size:.9rem;color:var(--text-secondary)}.course-body{padding:1.5rem}.course-stats{display:flex;gap:1rem;margin-top:1rem;padding-top:1rem;border-top:1px solid var(--border)}.lesson-list{display:flex;flex-direction:column;gap:1rem}.lesson-card{background:var(--card-bg);border-radius:.75rem;border:1px solid var(--border);overflow:hidden;transition:transform var(--transition-normal) ease,box-shadow var(--transition-normal) ease,border-color var(--transition-normal) ease}.lesson-card:hover{transform:scale(1.02);box-shadow:var(--shadow-lg);border-color:var(--primary-light)}.lesson-header{padding:1rem 1.5rem;cursor:pointer;display:flex;justify-content:space-between;align-items:center;transition:background .2s;text-decoration:none;color:inherit}.lesson-header:hover{background:var(--primary-light)}.lesson-header h3{font-size:1rem;font-weight:600;margin:0}.lesson-header .subtitle{font-size:.85rem;color:var(--text-secondary)}.lesson-meta{display:flex;gap:1rem;align-items:center;font-size:.85rem;color:var(--text-secondary)}.lesson-meta .expand{font-size:1.2rem}.lesson-number{flex-shrink:0;width:2.5rem;height:2.5rem;display:flex;align-items:center;justify-content:center;border-radius:.5rem;background:var(--primary-light);color:var(--primary);font-weight:700;font-size:.85rem}.lesson-info-col{flex:1;min-width:0}.lesson-card:nth-child(2n){background:color-mix(in srgb,var(--bg) 50%,var(--card-bg))}.lesson-list--bauhaus{gap:1.15rem}.bauhaus-lesson-card{position:relative;display:grid;gap:.9rem;padding:1rem 1.25rem;border:2px solid transparent;border-radius:var(--radius-xl);background:linear-gradient(var(--card-bg),var(--card-bg)) padding-box,linear-gradient(125deg,var(--bauhaus-red),var(--bauhaus-yellow),var(--bauhaus-blue)) border-box;box-shadow:var(--shadow-sm);text-decoration:none;color:inherit;overflow:hidden;transition:transform var(--transition-normal) ease,box-shadow var(--transition-normal) ease}.bauhaus-lesson-card:before,.bauhaus-lesson-card:after{content:"";position:absolute;pointer-events:none}.bauhaus-lesson-card:before{top:.55rem;right:.55rem;width:.9rem;height:.9rem;background:var(--bauhaus-red);border:2px solid var(--bauhaus-ink)}.bauhaus-lesson-card:after{left:.8rem;bottom:.7rem;width:.52rem;height:.52rem;border-radius:999px;background:var(--bauhaus-blue)}.bauhaus-lesson-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg)}.bauhaus-lesson-top{display:flex;align-items:flex-start;gap:.9rem}.bauhaus-lesson-number{background:var(--bauhaus-paper);color:var(--bauhaus-ink);border:2px solid var(--bauhaus-ink);border-radius:.35rem}.bauhaus-lesson-info h3{margin:0;font-size:1rem;color:var(--bauhaus-ink)}.bauhaus-lesson-info .subtitle{margin-top:.15rem;font-size:.83rem;color:var(--text-secondary)}.bauhaus-lesson-meta{margin-left:auto;gap:.6rem;align-items:center;color:var(--text-secondary)}.lesson-completion-badge{padding:.18rem .5rem;border-radius:999px;border:1px solid color-mix(in srgb,var(--success) 50%,var(--border));background:color-mix(in srgb,var(--success) 22%,var(--card-bg));color:color-mix(in srgb,var(--success-800) 78%,var(--text));font-size:.7rem;font-weight:700;letter-spacing:.04em;text-transform:uppercase}.lesson-progress-meter{position:relative;z-index:1}.lesson-progress-labels{display:flex;justify-content:space-between;align-items:center;margin-bottom:.35rem;font-size:.78rem;color:var(--text-secondary)}.lesson-progress-labels strong{color:var(--bauhaus-ink)}.lesson-progress-track{height:.55rem;border-radius:999px;background:color-mix(in srgb,var(--neutral-200) 80%,var(--card-bg));border:1px solid color-mix(in srgb,var(--neutral-400) 45%,var(--card-bg));overflow:hidden}.lesson-progress-fill{width:var(--lesson-progress, 0%);height:100%;border-radius:inherit;background:linear-gradient(90deg,var(--bauhaus-red),var(--bauhaus-yellow),var(--bauhaus-blue));transition:width .28s ease}@media(max-width:768px){.bauhaus-lesson-top{flex-wrap:wrap}.bauhaus-lesson-meta{width:100%;margin-left:0;justify-content:flex-end}}.lesson-detail{padding:1.5rem;border-top:1px solid 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