.theme-toggle{margin:0 15px}.theme-toggle-btn{background-color:var(--color-background-alt);border:1px solid var(--color-border);cursor:pointer;width:40px;height:40px;border-radius:50%;display:flex;align-items:center;justify-content:center;color:var(--color-text-primary);transition:all .3s ease;box-shadow:var(--shadow-sm)}.theme-toggle-btn:hover{background-color:var(--color-background-hover);transform:translateY(-2px);box-shadow:var(--shadow-md)}.theme-toggle-btn svg{transition:transform .5s cubic-bezier(.68,-.55,.27,1.55)}.theme-toggle-btn:active svg{transform:rotate(360deg)}.login-modal-backdrop{position:fixed;top:0;left:0;right:0;bottom:0;background-color:#0009;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);display:flex;align-items:center;justify-content:center;z-index:1050}.login-modal-content{background-color:var(--color-surface);color:var(--color-text-primary);padding:24px 32px;border-radius:12px;box-shadow:var(--shadow-xl);width:90%;max-width:400px;position:relative;text-align:center;border:1px solid var(--color-border)}.login-modal-title{font-size:1.75rem;font-weight:600;margin:0 0 2rem;color:var(--color-text-primary)}.auth-providers{display:flex;flex-direction:column;gap:1rem;margin-bottom:2rem}.provider-button{display:inline-flex;align-items:center;justify-content:center;width:100%;padding:12px;border-radius:6px;font-size:1rem;font-weight:500;cursor:pointer;gap:12px;transition:background-color .2s ease,border-color .2s ease,transform .1s ease;background-color:var(--color-surface-elevated);color:var(--color-text-primary);border:1px solid var(--color-border-hover)}.light-theme .provider-button{background-color:#fff;border-color:#e5e7eb}.light-theme .provider-button:hover{background-color:#f9fafb}.dark-theme .provider-button{background-color:var(--color-surface);border-color:var(--color-border-hover)}.dark-theme .provider-button:hover{background-color:var(--color-surface-hover);border-color:var(--color-text-secondary)}.provider-button:active{transform:scale(.98)}.provider-icon{width:24px;height:24px}.legal-text{font-size:.8rem;color:var(--color-text-secondary);margin-bottom:1.5rem;line-height:1.5}.legal-text a{color:var(--color-text-primary);text-decoration:underline;text-decoration-color:var(--color-border-hover);transition:text-decoration-color .2s ease}.legal-text a:hover{text-decoration-color:var(--color-text-primary)}.user-info-container{display:flex;align-items:center;justify-content:center;gap:1rem;margin-bottom:2rem}.waving-hand-emoji{font-size:1.75rem}.user-email{font-size:1.125rem;font-weight:500;color:var(--color-text-primary)}.cancel-divider{border-top:1px solid var(--color-border);margin:0 -32px 1rem}.cancel-button{width:auto;padding:8px 24px;background-color:transparent;color:var(--color-text-secondary);border:1px solid var(--color-primary);border-radius:6px;cursor:pointer;font-size:.9rem;font-weight:500;transition:all .2s ease}.cancel-button:hover{background-color:var(--color-primary);color:#fff}.navbar{background-color:var(--color-background-alt);color:var(--color-text-primary);display:flex;flex-direction:column;justify-content:center;align-items:center;font-size:1rem;position:sticky;top:0;z-index:1000;transition:all .3s ease-in-out;border-bottom:1px solid transparent}.navbar.navbar-scrolled{background-color:var(--color-surface);border-bottom:1px solid var(--color-border);box-shadow:var(--shadow-md)}.navbar-container{display:flex;justify-content:space-between;align-items:center;height:60px;width:100%;max-width:1400px;padding:0 24px}.navbar-left{display:flex;align-items:center;gap:2rem}.navbar-logo{color:var(--color-text-primary);display:flex;align-items:center;text-decoration:none;font-size:1.5rem;font-weight:700;font-family:Poppins,sans-serif;flex-shrink:0}.navbar-logo-img{height:30px;margin-right:10px;transition:transform .3s ease-in-out}.navbar-logo:hover .navbar-logo-img{transform:rotate(-15deg) scale(1.1)}.navbar-desktop-menu{display:flex;align-items:center;list-style:none;margin:0;padding:0;gap:.5rem}.navbar-right{display:flex;align-items:center;gap:16px}.navbar-nav-item{height:60px;display:flex;align-items:center}.navbar-nav-link{color:var(--color-text-secondary);display:flex;align-items:center;text-decoration:none;padding:0 1rem;height:100%;font-weight:500;position:relative;transition:color .2s ease-in-out,background-color .2s ease-in-out;border-radius:6px}.navbar-desktop-menu .navbar-nav-link:hover{color:var(--color-text-primary)}.navbar-desktop-menu .navbar-nav-link:after{content:"";position:absolute;bottom:12px;left:50%;transform:translate(-50%);width:0;height:2px;background-color:var(--color-primary);transition:width .3s ease;border-radius:2px}.navbar-desktop-menu .navbar-nav-link.active{color:var(--color-text-primary)}.navbar-desktop-menu .navbar-nav-link.active:after,.navbar-desktop-menu .navbar-nav-link:hover:after{width:25%}.navbar-nav-link.navbar-subscription-link{color:var(--color-primary);font-weight:600}.navbar-nav-link.navbar-subscription-link:hover{color:var(--color-primary-dark)}.navbar-desktop-auth{display:flex;align-items:center}.navbar-sign-in-btn{background-color:var(--color-primary);color:#fff;border:none;padding:8px 16px;border-radius:6px;font-size:.9rem;font-weight:600;cursor:pointer;transition:all .2s ease}.navbar-sign-in-btn:hover{background-color:var(--color-primary-dark);transform:translateY(-1px)}.navbar-user-profile-trigger{display:flex;align-items:center;cursor:pointer;gap:8px;padding:4px;border-radius:50px;transition:background-color .2s ease}.navbar-user-profile-trigger:hover{background-color:var(--color-background-hover)}.navbar-user-avatar-container{width:36px;height:36px;border-radius:50%;overflow:hidden;display:flex;align-items:center;justify-content:center;border:2px solid var(--color-border)}.navbar-user-avatar{width:100%;height:100%;object-fit:cover}.navbar-user-avatar-fallback{width:100%;height:100%;display:flex;align-items:center;justify-content:center;background-color:var(--color-primary-light);color:var(--color-primary-dark);font-weight:600;font-size:1rem}.navbar-avatar-skeleton{width:36px;height:36px;border-radius:50%;background-color:var(--color-skeleton);animation:pulse 1.5s infinite ease-in-out}.navbar-dropdown-arrow{color:var(--color-text-secondary)}.navbar-pro-badge{display:flex;align-items:center;gap:6px;background:linear-gradient(90deg,#3b82f6,#6366f1);color:#fff;padding:6px 12px;border-radius:8px;font-size:.9rem;font-weight:600;cursor:default;transition:all .2s ease-in-out;box-shadow:0 1px 3px #0000001a,0 1px 2px #0000000f}.navbar-menu-icon{display:none;cursor:pointer;padding:8px;margin-left:-8px;border-radius:50%;transition:background-color .2s ease}.navbar-menu-icon:hover{background-color:var(--color-background-hover)}.navbar-hamburger{display:flex;flex-direction:column;justify-content:space-around;width:24px;height:18px}.navbar-hamburger span{display:block;height:2px;width:100%;background:var(--color-text-primary);border-radius:10px;transition:all .3s ease-in-out}.navbar-hamburger.active span:nth-child(1){transform:rotate(45deg) translate(5px,5px)}.navbar-hamburger.active span:nth-child(2){opacity:0}.navbar-hamburger.active span:nth-child(3){transform:rotate(-45deg) translate(5px,-5px)}.navbar-mobile-wrapper{position:fixed;top:60px;left:-100%;width:100%;height:calc(100vh - 60px);background-color:var(--color-surface);z-index:999;transition:left .3s ease-in-out;display:flex;flex-direction:column;justify-content:space-between;padding:2rem 0;border-top:1px solid var(--color-border)}.navbar-mobile-wrapper.active{left:0}.navbar-mobile-menu{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;align-items:center;width:100%}.navbar-mobile-menu .navbar-nav-item{width:100%;height:auto}.navbar-mobile-menu .navbar-nav-link{padding:1.5rem 2rem;width:100%;justify-content:center;font-size:1.2rem}.navbar-mobile-menu .navbar-nav-link.active{color:var(--color-primary)}.navbar-mobile-auth{display:flex;justify-content:center;padding:2rem;border-top:1px solid var(--color-border)}@media screen and (max-width: 960px){.navbar-desktop-menu,.navbar-desktop-auth,.navbar-pro-badge{display:none}.navbar-menu-icon{display:flex}}@keyframes pulse{0%,to{opacity:1}50%{opacity:.5}}.navbar-promo-banner{background:linear-gradient(90deg,#6a11cb,#2575fc);color:#fff;padding:8px 24px;text-align:center;font-size:.9rem;font-weight:500;display:flex;justify-content:center;align-items:center;position:relative;width:100%;z-index:1001}.navbar-promo-content{flex-grow:1}.navbar-promo-content strong{font-weight:700;color:khaki}.navbar-promo-close-btn{background:none;border:none;color:#fff;cursor:pointer;padding:4px;opacity:.8;transition:opacity .2s ease-in-out,background-color .2s ease-in-out;position:absolute;right:16px;border-radius:50%;display:flex;align-items:center;justify-content:center}.navbar-promo-close-btn:hover{opacity:1;background-color:#ffffff26}.modal-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background-color:#0009;display:flex;align-items:center;justify-content:center;z-index:1000;-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px)}.modal-content{background-color:var(--color-surface);color:var(--color-text-primary);border-radius:12px;box-shadow:var(--shadow-xl);border:1px solid var(--color-border);width:90%;max-width:700px;max-height:85vh;display:flex;flex-direction:column}.modal-header{display:flex;justify-content:space-between;align-items:center;padding:18px 24px;border-bottom:1px solid var(--color-border)}.modal-title{font-size:1.25rem;font-weight:600;margin:0}.modal-close-btn{background:none;border:none;cursor:pointer;color:var(--color-text-secondary);padding:4px;border-radius:50%;display:flex;align-items:center;justify-content:center;transition:background-color .2s,color .2s}.modal-close-btn:hover{background-color:var(--color-background-alt);color:var(--color-text-primary)}.modal-body{padding:24px;overflow-y:auto;line-height:1.7}.modal-body h3{font-size:1.1rem;font-weight:600;margin-top:20px;margin-bottom:10px;color:var(--color-text-primary)}.modal-body p{font-size:.95rem;color:var(--color-text-secondary);margin-bottom:1rem}.modal-body ul{padding-left:20px;margin-bottom:1rem}.footer{background-color:var(--color-background-alt);color:var(--color-text-secondary);padding:3rem 0 1rem;border-top:1px solid var(--color-border)}.footer-content{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:2rem;margin-bottom:2rem}.footer-section h3{color:var(--color-text-primary);font-size:1.125rem;margin-bottom:1rem;font-weight:600}.footer-section ul{list-style:none;padding:0}.footer-section ul li{margin-bottom:.5rem}.footer-section ul li a{color:var(--color-text-secondary);text-decoration:none;transition:color .2s}.footer-section ul li a:hover{color:var(--color-primary);text-decoration:underline}.footer-section p{line-height:1.6}.footer-bottom{text-align:center;padding-top:1.5rem;border-top:1px solid var(--color-border);font-size:.875rem}.footer-legal-link{background:none;border:none;padding:0;margin:0;font:inherit;color:var(--color-text-secondary);cursor:pointer;text-align:left;transition:color .2s}.footer-legal-link:hover{color:var(--color-primary);text-decoration:none}@media (max-width: 768px){.footer-content{grid-template-columns:repeat(2,1fr)}}@media (max-width: 480px){.footer-content{grid-template-columns:1fr}}.loading-spinner-overlay{display:flex;justify-content:center;align-items:center;width:100%;height:calc(100vh - 120px);min-height:300px;position:absolute;top:0;left:0;right:0;bottom:0}.loading-spinner-icon{width:48px;height:48px;animation:spin 1s linear infinite;color:var(--primary-color)}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}:root{--color-primary: #3b82f6;--color-primary-rgb: 59, 130, 246;--color-primary-dark: #2563eb;--color-primary-light: #60a5fa;--color-success: #10b981;--color-warning: #f59e0b;--color-danger: #ef4444;--color-info: #0ea5e9;--color-easy: #10b981;--color-medium: #f59e0b;--color-hard: #ef4444;--color-focus-ring: rgba(var(--color-primary-rgb), .5);--transition-theme: color .3s ease, background-color .3s ease, border-color .3s ease, box-shadow .3s ease;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .05);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .1), 0 2px 4px -2px rgba(0, 0, 0, .1);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .15), 0 4px 6px -4px rgba(0, 0, 0, .1);--shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, .2), 0 8px 10px -6px rgba(0, 0, 0, .1);--shadow-inner: inset 0 2px 4px 0 rgba(0, 0, 0, .05);--scrollbar-track-light: #e2e8f0;--scrollbar-track-dark: #2d2d2d;--scrollbar-light: rgba(0, 0, 0, .2);--scrollbar-light-hover: rgba(0, 0, 0, .3);--scrollbar-dark: rgba(155, 155, 155, .5);--scrollbar-dark-hover: rgba(155, 155, 155, .7)}.light-theme{--color-background: #f7f8fa;--color-surface: #ffffff;--color-background-alt: #ffffff;--color-text-primary: #1a202c;--color-text-secondary: #4a5568;--color-text-tertiary: #718096;--color-border: #e2e8f0;--color-border-light: #edf2f7;--color-border-hover: #cbd5e0;--color-ui-track: #e2e8f0;--color-skeleton-base: #e2e8f0;--skeleton-shimmer-gradient: linear-gradient( 90deg, rgba(0, 0, 0, 0) 0%, rgba(0, 0, 0, .04) 50%, rgba(0, 0, 0, 0) 100% );--color-background-hover: rgba(0, 0, 0, .04);--color-background-code: #ffffff;--color-surface-hover: #f7f8fa;--color-surface-elevated: #ffffff;--color-text-contrast: #1e293b;--color-text-code: #000000;scrollbar-width:thin;scrollbar-color:var(--scrollbar-light) transparent;--color-editor-background: #f1f5f9;--color-editor-gutter: #e2e8f0;--color-editor-statusbar: #cbd5e1;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .03);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .05), 0 2px 4px -1px rgba(0, 0, 0, .03);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .08), 0 4px 6px -2px rgba(0, 0, 0, .05);--shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, .1), 0 8px 10px -6px rgba(0, 0, 0, .04);--shadow-inner: inset 0 2px 4px 0 rgba(0, 0, 0, .03)}.dark-theme{--color-background: #0d1117;--color-surface: #161b22;--color-background-alt: #161b22;--color-text-primary: #c9d1d9;--color-text-secondary: #8b949e;--color-text-tertiary: #484f58;--color-border: #30363d;--color-border-light: #21262d;--color-border-hover: #8b949e;--color-ui-track: #2d333b;--color-skeleton-base: #21262d;--skeleton-shimmer-gradient: linear-gradient( 90deg, rgba(255, 255, 255, 0) 0%, rgba(255, 255, 255, .05) 50%, rgba(255, 255, 255, 0) 100% );--color-background-hover: rgba(255, 255, 255, .1);--color-background-code: #1e1e1e;--color-surface-hover: #2d2d2d;--color-surface-elevated: #262626;--color-text-contrast: #1e293b;--color-text-code: #f8fafc;--shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, .3);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .4), 0 2px 4px -1px rgba(0, 0, 0, .2);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .5), 0 4px 6px -2px rgba(0, 0, 0, .3);--shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, .6), 0 8px 10px -6px rgba(0, 0, 0, .4);--shadow-inner: inset 0 2px 4px 0 rgba(0, 0, 0, .3);--color-editor-background: #1e1e1e;--color-editor-gutter: #252526;--color-editor-statusbar: #1e1e1e;scrollbar-width:thin;scrollbar-color:var(--scrollbar-dark) transparent}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Open Sans,Helvetica Neue,sans-serif;background-color:var(--color-background);color:var(--color-text-primary);line-height:1.5;font-size:16px;transition:var(--transition-theme)}html{scroll-behavior:smooth}h1,h2,h3,h4,h5,h6{font-weight:600;line-height:1.3;margin-bottom:.5em;color:var(--color-text-primary)}h1{font-size:2rem}h2{font-size:1.75rem}h3{font-size:1.5rem}h4{font-size:1.25rem}p{margin-bottom:1rem}a{color:var(--color-primary);text-decoration:none;transition:color .2s,text-decoration .2s}a:hover{color:var(--color-primary-dark);text-decoration:underline}button,input[type=button],input[type=submit]{cursor:pointer;font-family:inherit;font-size:1rem}button:focus,input:focus,textarea:focus,select:focus{outline:2px solid var(--color-focus-ring);outline-offset:2px}button:disabled,input:disabled,textarea:disabled,select:disabled{cursor:not-allowed;opacity:.6}.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border-width:0}.text-center{text-align:center}.container{width:100%;max-width:1200px;margin-left:auto;margin-right:auto;padding-left:1rem;padding-right:1rem}code,pre{font-family:Fira Code,Monaco,Consolas,Courier New,monospace;font-size:.9em;border-radius:4px}code{padding:.2em .4em;background-color:var(--color-background-alt);color:var(--color-text-primary)}pre{padding:1em;background-color:var(--color-background-alt);overflow-x:auto;line-height:1.6;border:1px solid var(--color-border)}pre code{padding:0;background-color:transparent}img,video,canvas,svg{max-width:100%;height:auto}input,textarea,select{font-family:inherit;font-size:1rem;padding:.5rem;border:1px solid var(--color-border);border-radius:4px;background-color:var(--color-background);color:var(--color-text-primary);transition:border-color .2s,box-shadow .2s}input:hover,textarea:hover,select:hover{border-color:var(--color-border-hover)}input:focus,textarea:focus,select:focus{border-color:var(--color-primary);box-shadow:0 0 0 2px var(--color-focus-ring);outline:none}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideUp{0%{transform:translateY(10px);opacity:0}to{transform:translateY(0);opacity:1}}.fade-in{animation:fadeIn .3s ease-in-out}.slide-up{animation:slideUp .3s ease-out}@media (prefers-reduced-motion: reduce){*{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important;scroll-behavior:auto!important}}a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:2px solid var(--color-primary);outline-offset:2px}a:hover{text-decoration:none!important}.navbar-logo-img{height:30px;margin-right:8px;transition:transform .3s ease-in-out}.navbar-logo:hover .navbar-logo-img{transform:rotate(-15deg)}html,body,#root{height:100%}.app-container{display:flex;flex-direction:column;min-height:100%}.main-content{flex-grow:1}