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var(--transition-fast)}.theme-switcher .sidebar-link-chevron.open{transform:rotate(180deg)}.theme-switcher .sidebar-link-chevron svg{width:16px;height:16px}.theme-switcher-overlay{position:fixed;inset:0;z-index:999}.theme-switcher-popover{position:fixed;width:280px;max-height:420px;background:var(--color-bg-card, var(--color-bg-secondary));border:1px solid var(--color-border);border-radius:var(--radius-xl);box-shadow:var(--shadow-xl);z-index:1000;overflow:hidden;animation:popoverFadeIn .15s ease-out}@keyframes popoverFadeIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.theme-switcher-popover-header{padding:var(--space-3) var(--space-4);border-bottom:1px solid 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svg{width:16px;height:16px}.theme-switcher-popover-info{display:flex;flex-direction:column;gap:1px;flex:1;min-width:0}.theme-switcher-popover-name{font-size:var(--text-sm);font-weight:var(--font-medium);color:var(--color-text-primary)}.theme-switcher-popover-desc{font-size:var(--text-xs);color:var(--color-text-tertiary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.theme-switcher-popover-check{display:flex;align-items:center;justify-content:center;color:var(--color-primary);flex-shrink:0}.theme-switcher-compact{position:relative}.theme-switcher-toggle{width:36px;height:36px}.theme-switcher-toggle svg{width:20px;height:20px}.theme-switcher-backdrop{position:fixed;inset:0;z-index:var(--z-modal-backdrop)}.theme-switcher-dropdown{position:absolute;top:100%;right:0;margin-top:var(--space-2);min-width:160px;background:var(--color-bg-secondary);border:1px solid var(--color-border);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);z-index:var(--z-modal);padding:var(--space-2);animation:slideUp var(--transition-fast) ease-out}.theme-switcher-option{display:flex;align-items:center;gap:var(--space-3);padding:var(--space-3);background:transparent;border:1px solid var(--color-border);border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition-fast);text-align:left;width:100%;font-family:inherit}.theme-switcher-option:hover{background:var(--color-surface-2);border-color:var(--color-primary)}.theme-switcher-option.active{background:var(--color-primary-subtle);border-color:var(--color-primary)}.theme-switcher-dropdown .theme-switcher-option{border:none;padding:var(--space-2) var(--space-3)}.theme-switcher-dropdown .theme-switcher-option:hover{background:var(--color-surface-2)}.theme-switcher-dropdown .theme-switcher-option.active{background:var(--color-primary-subtle)}.theme-switcher-dropdown .theme-switcher-option-icon{width:20px;height:20px;display:flex;align-items:center;justify-content:center}.theme-switcher-dropdown .theme-switcher-option-icon svg{width:18px;height:18px}.theme-switcher-option-name{font-weight:var(--font-semibold);color:var(--color-text-primary);font-size:var(--text-sm)}@keyframes slideUp{0%{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:translateY(0)}}.breadcrumb{margin-bottom:var(--space-4)}.breadcrumb ol{display:flex;align-items:center;gap:var(--space-2);list-style:none;margin:0;padding:0;font-size:var(--text-sm);color:var(--color-text-tertiary)}.breadcrumb li{display:flex;align-items:center;gap:var(--space-2)}.breadcrumb a{color:var(--color-primary);text-decoration:none;transition:color .2s ease}.breadcrumb a:hover{color:var(--color-primary-light)}.breadcrumb svg{width:16px;height:16px;flex-shrink:0}.sidebar{display:none;position:fixed;left:0;top:0;bottom:0;width:var(--sidebar-width);background:var(--color-bg-secondary);border-right:1px 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transparent}.sidebar-nav::-webkit-scrollbar{width:6px}.sidebar-nav::-webkit-scrollbar-track{background:transparent}.sidebar-nav::-webkit-scrollbar-thumb{background-color:var(--color-border);border-radius:3px}.sidebar-nav::-webkit-scrollbar-thumb:hover{background-color:var(--color-text-tertiary)}.sidebar-section{margin-bottom:var(--space-4)}.sidebar-section-label{font-size:var(--text-xs);font-weight:var(--font-semibold);text-transform:uppercase;letter-spacing:.1em;color:var(--color-text-tertiary);padding:var(--space-2) var(--space-3);margin-bottom:var(--space-1)}.sidebar-link{display:flex;align-items:center;gap:var(--space-3);padding:var(--space-3);border-radius:var(--radius-lg);color:var(--color-text-secondary);font-weight:var(--font-medium);transition:all var(--transition-fast);text-decoration:none}.sidebar-link:hover{background:var(--color-surface-2);color:var(--color-text-primary)}.sidebar-link.active{background:var(--color-primary-subtle);color:var(--color-primary-light)}.sidebar-link-icon{width:20px;height:20px;opacity:.7}.sidebar-link.active .sidebar-link-icon{opacity:1}.sidebar-footer{margin-top:auto;padding-top:var(--space-4);border-top:1px solid var(--color-border)}.sidebar-user{display:flex;align-items:center;gap:var(--space-3);padding:var(--space-3);border-radius:var(--radius-lg);cursor:pointer;transition:background var(--transition-fast)}.sidebar-user:hover{background:var(--color-surface-2)}.sidebar-user-avatar{width:36px;height:36px;border-radius:var(--radius-full);background:var(--gradient-primary);display:flex;align-items:center;justify-content:center;color:#fff;font-weight:var(--font-semibold);font-size:var(--text-sm)}.sidebar-user-avatar-img.user-avatar{width:36px;height:36px;flex-shrink:0}.sidebar-user-info{flex:1;min-width:0}.sidebar-user-name{font-weight:var(--font-semibold);color:var(--color-text-primary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.sidebar-user-email{font-size:var(--text-xs);color:var(--color-text-tertiary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.sidebar-user-container{position:relative}.sidebar-user-menu{position:absolute;bottom:100%;left:0;right:0;margin-bottom:var(--space-2);background:var(--color-bg-secondary);border:1px solid var(--color-border);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg, 0 10px 25px rgba(0, 0, 0, .15));overflow:hidden;z-index:100}.sidebar-user-menu-item{display:flex;align-items:center;gap:var(--space-3);width:100%;padding:var(--space-3) var(--space-4);border:none;background:none;color:var(--color-text-secondary);font-size:var(--text-sm);font-weight:var(--font-medium);cursor:pointer;transition:all var(--transition-fast);text-align:left}.sidebar-user-menu-item:hover{background:var(--color-surface-2);color:var(--color-text-primary)}.sidebar-user-menu-item+.sidebar-user-menu-item{border-top:1px solid var(--color-border)}.mobile-header{display:flex;align-items:center;justify-content:space-between;padding:var(--space-4);background:var(--color-bg-secondary);border-bottom:1px solid var(--color-border);position:sticky;top:0;z-index:var(--z-sticky)}@media(min-width:1024px){.mobile-header{display:none}}.mobile-header-logo{display:flex;align-items:center;gap:var(--space-3)}.mobile-header-logo-icon{width:36px;height:36px;display:flex;align-items:center;justify-content:center;color:var(--color-text-primary)}.mobile-header-logo-text{font-family:var(--font-display);font-size:var(--text-lg);font-weight:var(--font-bold);color:var(--color-text-primary)}.mobile-header-actions{display:flex;align-items:center;gap:var(--space-2)}.mobile-header-avatar-btn{padding:0;width:36px;height:36px;border-radius:var(--radius-full);overflow:hidden}.mobile-user-menu-container{position:relative}.mobile-user-menu-backdrop{position:fixed;inset:0;z-index:var(--z-modal-backdrop)}.mobile-user-menu-dropdown{position:absolute;top:100%;right:0;margin-top:var(--space-2);min-width:160px;background:var(--color-bg-secondary);border:1px solid var(--color-border);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);z-index:var(--z-modal);padding:var(--space-2);animation:slideDown var(--transition-fast) ease-out}@keyframes slideDown{0%{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:translateY(0)}}.mobile-user-menu-item{display:flex;align-items:center;gap:var(--space-3);width:100%;padding:var(--space-2) var(--space-3);background:transparent;border:none;border-radius:var(--radius-md);cursor:pointer;transition:background-color var(--transition-fast);text-align:left;font-family:inherit;font-size:var(--text-sm);font-weight:var(--font-medium);color:var(--color-text-primary)}.mobile-user-menu-item:hover{background:var(--color-surface-2)}.mobile-user-menu-divider{height:1px;background:var(--color-border);margin:var(--space-1) 0}.mobile-user-menu-item svg{flex-shrink:0;color:var(--color-text-tertiary)}.bottom-nav{display:flex;background:var(--color-bg-secondary);border-top:1px solid var(--color-border);padding:var(--space-2) var(--space-4);padding-bottom:calc(var(--space-2) + var(--safe-area-bottom))}.bottom-nav-item{flex:1;display:flex;flex-direction:column;align-items:center;gap:var(--space-1);padding:var(--space-2);color:var(--color-text-tertiary);text-decoration:none;font-size:var(--text-xs);font-weight:var(--font-medium);transition:color var(--transition-fast)}.bottom-nav-item:hover,.bottom-nav-item.active{color:var(--color-primary-light)}.bottom-nav-icon{width:24px;height:24px}.bottom-nav-wrapper{position:fixed;bottom:0;left:0;right:0;z-index:var(--z-bottomnav)}@media(min-width:1024px){.bottom-nav-wrapper{display:none}}.bottom-nav button.bottom-nav-item{flex:1;display:flex;flex-direction:column;align-items:center;gap:var(--space-1);padding:var(--space-2);color:var(--color-text-tertiary);background:none;border:none;font-size:var(--text-xs);font-weight:var(--font-medium);cursor:pointer;transition:color var(--transition-fast)}.bottom-nav button.bottom-nav-item:hover,.bottom-nav button.bottom-nav-item.active{color:var(--color-primary-light)}.bottom-nav-menu{position:absolute;bottom:100%;left:0;right:0;background:var(--color-bg-secondary);border-top:1px solid var(--color-border);padding:var(--space-2) var(--space-4);padding-bottom:var(--space-2);box-shadow:0 -4px 20px #00000026;animation:slideUp .2s ease}@keyframes slideUp{0%{transform:translateY(8px);opacity:0}to{transform:translateY(0);opacity:1}}.bottom-nav-menu-section{border-bottom:1px solid var(--color-border);padding-bottom:var(--space-1);margin-bottom:var(--space-1)}.bottom-nav-menu-section:last-child{border-bottom:none;margin-bottom:0}.bottom-nav-menu-section-header{display:flex;align-items:center;justify-content:space-between;width:100%;padding:var(--space-2) var(--space-2);background:none;border:none;color:var(--color-text-secondary);font-size:var(--text-xs);font-weight:var(--font-semibold);text-transform:uppercase;letter-spacing:.05em;cursor:pointer}.section-chevron{transition:transform .2s ease}.section-chevron.expanded{transform:rotate(180deg)}.bottom-nav-menu-items{display:flex;flex-direction:column}.bottom-nav-menu-item{display:block;width:100%;padding:var(--space-3) var(--space-4);background:none;border:none;color:var(--color-text-primary);font-size:var(--text-sm);font-weight:var(--font-medium);text-align:left;cursor:pointer;border-radius:var(--radius-sm);transition:background var(--transition-fast)}.bottom-nav-menu-item:hover{background:var(--color-surface-1)}.dash-greeting{padding:var(--space-6) var(--space-5) 0}.dash-greeting-time{font-family:var(--font-mono);font-size:var(--text-xs);font-weight:var(--font-semibold);text-transform:uppercase;letter-spacing:.1em;color:var(--color-text-muted);margin-bottom:var(--space-1)}.dash-greeting-name{font-family:var(--font-display);font-size:var(--text-3xl);font-weight:var(--font-bold);letter-spacing:-.02em;background:linear-gradient(135deg,var(--color-text-primary) 0%,var(--color-text-secondary) 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.dash-hero-wrap{padding:var(--space-5)}.dash-hero{border-radius:var(--radius-xl);background:var(--color-bg-secondary);border:1px solid var(--color-border);overflow:hidden;position:relative}.dash-hero:before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:var(--dash-hero-border-gradient);background-size:200% 100%;animation:shimmer 3s ease-in-out infinite}@keyframes dashShimmer{0%,to{background-position:0% 50%}50%{background-position:100% 50%}}.dash-hero-glow{position:absolute;top:-60px;right:-60px;width:200px;height:200px;background:radial-gradient(circle,var(--color-primary-subtle) 0%,transparent 70%);pointer-events:none}.dash-hero-label{padding:var(--space-5) var(--space-5) 0;display:flex;align-items:center;gap:var(--space-2);font-family:var(--font-mono);font-size:11px;text-transform:uppercase;letter-spacing:.12em;color:var(--color-success);font-weight:var(--font-bold)}.dash-pulse-dot{width:8px;height:8px;border-radius:var(--radius-full);background:var(--dash-pulse-color);animation:pulse 2s ease-in-out infinite;flex-shrink:0}.dash-pulse-dot--warning{background:var(--dash-challenge-accent)}.dash-hero-content{padding:var(--space-4) var(--space-5)}.dash-hero-course{font-size:var(--text-xs);color:var(--color-text-muted);margin-bottom:var(--space-1);font-weight:var(--font-medium)}.dash-hero-title{font-family:var(--font-display);font-size:var(--text-xl);font-weight:var(--font-bold);letter-spacing:-.02em;margin-bottom:var(--space-1);line-height:var(--leading-snug);color:var(--color-text-primary)}.dash-hero-meta{font-size:var(--text-sm);color:var(--color-text-secondary);display:flex;align-items:center;gap:var(--space-3)}.dash-hero-meta span{display:flex;align-items:center;gap:var(--space-1)}.dash-hero-footer{padding:0 var(--space-5) var(--space-5)}.dash-challenge-wrap{padding:0 var(--space-5) var(--space-2)}.dash-challenge{border-radius:var(--radius-xl);background:var(--color-bg-secondary);border:1px solid var(--color-border);position:relative;overflow:hidden}.dash-challenge-glow{position:absolute;top:-40px;right:-40px;width:160px;height:160px;background:radial-gradient(circle,var(--color-warning-bg) 0%,transparent 70%);pointer-events:none}.dash-challenge-inner{padding:var(--space-5);position:relative}.dash-challenge-label{display:flex;align-items:center;gap:var(--space-2);font-family:var(--font-mono);font-size:11px;text-transform:uppercase;letter-spacing:.12em;color:var(--dash-challenge-accent);font-weight:var(--font-bold);margin-bottom:var(--space-3)}.dash-challenge-title{font-family:var(--font-display);font-size:var(--text-lg);font-weight:var(--font-bold);margin-bottom:var(--space-1);color:var(--color-text-primary)}.dash-challenge-desc{font-size:var(--text-sm);color:var(--color-text-secondary);line-height:var(--leading-normal);margin-bottom:var(--space-4)}.dash-challenge-footer{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:var(--space-3)}.dash-challenge-meta{font-family:var(--font-mono);font-size:var(--text-xs);color:var(--color-text-muted)}.dash-stats{display:grid;grid-template-columns:1fr 1fr 1fr;gap:var(--space-3);padding:var(--space-5)}.dash-stat-card{background:var(--color-bg-card);border:1px solid var(--color-border);border-radius:var(--radius-lg);padding:var(--space-4);text-align:center;display:flex;flex-direction:column;align-items:center;gap:var(--space-2)}.dash-stat-label{font-family:var(--font-accent);font-size:11px;color:var(--color-text-muted);font-weight:var(--font-semibold);text-transform:uppercase;letter-spacing:.03em}.dash-ring-value{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;font-family:var(--font-mono);font-size:var(--text-sm);font-weight:var(--font-bold);color:var(--color-text-primary)}.dash-section{margin-bottom:var(--space-6)}.dash-section-header{padding:0 var(--space-5);margin-bottom:var(--space-4);display:flex;align-items:center;justify-content:space-between}.dash-section-title{font-family:var(--font-display);font-size:var(--text-lg);font-weight:var(--font-bold);letter-spacing:-.02em;color:var(--color-text-primary)}.dash-section-link{font-size:var(--text-sm);color:var(--color-primary-light);font-weight:var(--font-semibold);cursor:pointer;background:none;border:none;font-family:var(--font-body)}.dash-continue-scroll{display:flex;gap:var(--space-4);padding:var(--space-1) var(--space-5);overflow-x:auto;scrollbar-width:none}.dash-continue-scroll::-webkit-scrollbar{display:none}.dash-continue-card{min-width:240px;background:var(--color-bg-card);border:1px solid var(--color-border);border-radius:var(--radius-xl);padding:var(--space-5);flex-shrink:0;cursor:pointer;transition:all .25s var(--ease-spring)}.dash-continue-card:hover{border-color:var(--color-border-focus);transform:translateY(-2px)}.dash-continue-icon{width:40px;height:40px;border-radius:var(--radius-lg);display:flex;align-items:center;justify-content:center;margin-bottom:var(--space-3);font-size:var(--text-lg)}.dash-continue-title{font-size:var(--text-base);font-weight:var(--font-bold);margin-bottom:var(--space-1);line-height:var(--leading-snug);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;color:var(--color-text-primary)}.dash-continue-lesson{font-size:var(--text-xs);color:var(--color-text-secondary);margin-bottom:var(--space-4)}.dash-progress-bar{height:4px;background:var(--color-surface-3);border-radius:var(--radius-full);overflow:hidden;margin-bottom:var(--space-1)}.dash-progress-fill{height:100%;border-radius:var(--radius-full);transition:width 1s 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var(--color-primary-subtle)}.form-input.disabled{background:var(--color-surface-1);color:var(--color-text-secondary);cursor:not-allowed}.form-input::placeholder{color:var(--color-text-tertiary)}.form-hint{display:block;margin-top:var(--space-1);font-size:var(--text-xs);color:var(--color-text-tertiary)}.profile-submit{width:100%;margin-top:var(--space-2);display:flex;align-items:center;justify-content:center;gap:var(--space-2)}.profile-submit:disabled{opacity:.6;cursor:not-allowed}.account-page{max-width:700px;margin:0 auto;padding:var(--space-4)}.account-page-header{margin-bottom:var(--space-6)}.account-page-header h1{margin-bottom:var(--space-1)}.account-tabs{display:flex;gap:var(--space-1);border-bottom:2px solid var(--color-border);margin-bottom:var(--space-6);overflow-x:auto;-webkit-overflow-scrolling:touch;scrollbar-width:none}.account-tabs::-webkit-scrollbar{display:none}.account-tab{padding:var(--space-3) 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var(--color-border);border-radius:var(--radius-lg);padding:var(--space-5)}.account-card-title{font-size:var(--text-base);font-weight:var(--font-semibold);margin-bottom:var(--space-3)}.account-card-description{color:var(--color-text-secondary);font-size:var(--text-sm);line-height:1.5}.account-card-link{color:var(--color-primary-light);font-size:var(--text-sm);font-weight:var(--font-medium);cursor:pointer;padding:var(--space-2) 0;width:fit-content}.account-card-link:hover{text-decoration:underline}.account-form-group{margin-bottom:var(--space-4)}.account-form-group label{display:block;margin-bottom:var(--space-2);font-weight:var(--font-medium);color:var(--color-text-primary);font-size:var(--text-sm)}.account-input{width:100%;padding:var(--space-3) var(--space-4);font-size:var(--text-sm);border:2px solid var(--color-border);border-radius:var(--radius-md);background:var(--color-surface-0);color:var(--color-text-primary);transition:border-color var(--transition-fast),box-shadow var(--transition-fast)}.account-input:focus{outline:none;border-color:var(--color-primary);box-shadow:0 0 0 3px var(--color-primary-subtle)}.account-input.disabled{background:var(--color-surface-1);color:var(--color-text-secondary);cursor:not-allowed}.account-hint{display:block;margin-top:var(--space-1);font-size:var(--text-xs);color:var(--color-text-tertiary)}.required{color:var(--color-error, #ef4444)}.account-save-btn{display:flex;align-items:center;justify-content:center;gap:var(--space-2);margin-top:var(--space-2)}.account-save-btn .spinner{width:1em;height:1em}.account-error{padding:var(--space-3) var(--space-4);margin-bottom:var(--space-4);background:var(--color-error-subtle, rgba(239, 68, 68, .1));border:1px solid var(--color-error, #ef4444);border-radius:var(--radius-md);color:var(--color-error, #ef4444);font-size:var(--text-sm)}.account-success{display:flex;align-items:center;gap:var(--space-2);padding:var(--space-3) var(--space-4);margin-bottom:var(--space-4);background:var(--color-success-subtle, rgba(34, 197, 94, .1));border:1px solid var(--color-success, #22c55e);border-radius:var(--radius-md);color:var(--color-success, #22c55e);font-size:var(--text-sm)}.account-warning{color:var(--color-warning, #f59e0b);font-size:var(--text-sm);font-weight:var(--font-medium)}.account-plan-info{display:flex;flex-direction:column;gap:var(--space-2)}.account-plan-badge{display:inline-block;padding:var(--space-1) var(--space-3);border-radius:var(--radius-full);background:var(--gradient-primary);color:#fff;font-size:var(--text-xs);font-weight:var(--font-semibold);width:fit-content}.account-plan-badge.free{background:var(--color-surface-2);color:var(--color-text-secondary)}.account-plan-name{font-size:var(--text-base);font-weight:var(--font-semibold)}.account-plan-details{color:var(--color-text-secondary);font-size:var(--text-sm);line-height:1.6}.account-loading-inline{display:flex;align-items:center;gap:var(--space-2);color:var(--color-text-secondary);font-size:var(--text-sm)}.account-table-container{overflow-x:auto;margin-top:var(--space-3)}.account-table{width:100%;border-collapse:collapse;font-size:var(--text-sm)}.account-table th{text-align:left;padding:var(--space-2) var(--space-3);border-bottom:2px solid var(--color-border);color:var(--color-text-tertiary);font-weight:var(--font-semibold);font-size:var(--text-xs);text-transform:uppercase;letter-spacing:.05em}.account-table td{padding:var(--space-3);border-bottom:1px solid var(--color-border);color:var(--color-text-primary)}.account-table-sub{font-size:var(--text-xs);color:var(--color-text-tertiary)}.account-status{display:inline-flex;align-items:center;gap:var(--space-1);font-size:var(--text-xs);font-weight:var(--font-medium)}.account-status.succeeded{color:var(--color-success, #22c55e)}.account-status.failed{color:var(--color-error, #ef4444)}.account-privacy-links{display:flex;flex-direction:column;align-items:flex-start;gap:var(--space-1);margin-top:var(--space-2)}.account-link-item{display:inline-flex;align-items:center;gap:var(--space-2);padding:var(--space-2) 0;border:none;background:none;color:var(--color-primary-light);font-size:var(--text-sm);font-weight:var(--font-medium);cursor:pointer;text-align:left}.account-link-item:hover{text-decoration:underline}.spinner{animation:spin 1s linear infinite}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.not-found{display:flex;align-items:center;justify-content:center;min-height:60vh}.not-found-content{text-align:center}.not-found-content h1{font-size:6rem;font-weight:var(--font-bold);background:linear-gradient(135deg,var(--color-primary),var(--color-secondary));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin-bottom:var(--space-2);line-height:1}.not-found-content h2{font-size:var(--text-2xl);margin-bottom:var(--space-4)}.not-found-content p{margin-bottom:var(--space-6);max-width:400px}.about-section{max-width:800px;margin:0 auto;padding:0 var(--space-4)}.about-container{padding-bottom:var(--space-16)}.about-header{text-align:center;margin-bottom:var(--space-12)}.about-title{font-size:var(--text-4xl);font-weight:var(--font-bold);margin-bottom:var(--space-4);background:linear-gradient(135deg,var(--color-primary),var(--color-secondary));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.about-subtitle{font-size:var(--text-lg);color:var(--color-text-secondary);max-width:600px;margin:0 auto}.about-content{display:flex;flex-direction:column;gap:var(--space-6)}.about-card{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-lg);padding:var(--space-8)}.about-card h2{font-size:var(--text-xl);font-weight:var(--font-semibold);margin-bottom:var(--space-3)}.about-card p{color:var(--color-text-secondary);line-height:1.7}.unauthorized{display:flex;align-items:center;justify-content:center;min-height:60vh;padding-top:8rem}.unauthorized-content{text-align:center}.unauthorized-icon{color:var(--color-primary);margin-bottom:var(--space-4);opacity:.8}.unauthorized-content h1{font-size:6rem;font-weight:var(--font-bold);background:linear-gradient(135deg,var(--color-primary),var(--color-secondary));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin-bottom:var(--space-2);line-height:1}.unauthorized-content h2{font-size:var(--text-2xl);margin-bottom:var(--space-4)}.unauthorized-content p{margin-bottom:var(--space-6);max-width:400px;margin-left:auto;margin-right:auto}:root{--font-display: "Source Serif 4", "Playfair Display", Georgia, serif;--font-body: "DM Sans", -apple-system, BlinkMacSystemFont, sans-serif;--font-mono: "JetBrains Mono", "Fira Code", monospace;--font-accent: "Sora", -apple-system, BlinkMacSystemFont, sans-serif;--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;--text-5xl: 3rem;--font-light: 300;--font-normal: 400;--font-medium: 500;--font-semibold: 600;--font-bold: 700;--leading-tight: 1.25;--leading-snug: 1.375;--leading-normal: 1.5;--leading-relaxed: 1.625;--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-16: 4rem;--radius-sm: .375rem;--radius-md: .5rem;--radius-lg: .75rem;--radius-xl: 1rem;--radius-2xl: 1.5rem;--radius-full: 9999px;--transition-fast: .15s cubic-bezier(.4, 0, .2, 1);--transition-base: .2s cubic-bezier(.4, 0, .2, 1);--transition-slow: .3s cubic-bezier(.4, 0, .2, 1);--ease-spring: cubic-bezier(.34, 1.56, .64, 1);--ease-out-expo: cubic-bezier(.16, 1, .3, 1);--ease-in-out-back: cubic-bezier(.68, -.6, .32, 1.6);--z-dropdown: 100;--z-sticky: 200;--z-fixed: 300;--z-modal-backdrop: 1100;--z-modal: 1200;--z-bottomnav: 1000;--dash-hero-border-gradient: linear-gradient(90deg, var(--color-primary), var(--color-success), var(--color-primary));--dash-streak-bg: var(--color-warning-bg);--dash-streak-text: var(--color-warning);--dash-challenge-accent: var(--color-warning);--dash-pulse-color: var(--color-success);--dash-ring-track: var(--color-surface-3);--sidebar-width: 280px;--sidebar-width-collapsed: 72px;--mobile-nav-height: 64px;--bottom-nav-height: 72px;--safe-area-bottom: env(safe-area-inset-bottom, 0px)}:root,[data-theme=dark]{--color-primary: #64A5FF;--color-primary-light: #7DB4FF;--color-primary-dark: #4A94F5;--color-primary-subtle: rgba(100, 165, 255, .15);--color-secondary: #64D2FF;--color-secondary-light: #8ADDFF;--color-secondary-dark: #4AC8F5;--color-accent: #BF5AF2;--color-accent-light: #D584F7;--color-success: #34C759;--color-success-light: #5CD679;--color-success-bg: rgba(52, 199, 89, .15);--color-warning: #FFD60A;--color-warning-bg: rgba(255, 214, 10, .15);--color-highlight: #FFD60A;--color-highlight-subtle: rgba(255, 214, 10, .1);--color-highlight-bg: rgba(255, 214, 10, .2);--color-highlight-hover: rgba(255, 214, 10, .3);--color-highlight-active: rgba(255, 214, 10, .4);--color-error: #FF453A;--color-error-light: #FF6961;--color-error-bg: rgba(255, 69, 58, .15);--color-bg-primary: #1A1A1C;--color-bg-secondary: #232326;--color-bg-tertiary: #2C2C2E;--color-bg-elevated: #3A3A3C;--color-bg-card: rgba(35, 35, 38, .72);--color-bg-modal: #232326;--color-bg-input: rgba(26, 26, 28, .6);--color-surface-1: rgba(255, 255, 255, .03);--color-surface-2: rgba(255, 255, 255, .05);--color-surface-3: rgba(255, 255, 255, .08);--color-glass: rgba(26, 26, 28, .72);--color-glass-light: rgba(45, 45, 48, .65);--color-glass-hover: rgba(60, 60, 64, .7);--color-glass-border: rgba(255, 255, 255, .05);--color-text-primary: #FFFFFF;--color-text-secondary: rgba(255, 255, 255, .7);--color-text-tertiary: rgba(255, 255, 255, .5);--color-text-muted: rgba(255, 255, 255, .35);--color-border: rgba(255, 255, 255, .08);--color-border-light: rgba(255, 255, 255, .05);--color-border-focus: var(--color-primary);--color-border-glow: rgba(100, 165, 255, .4);--shadow-sm: 0 1px 2px rgba(0, 0, 0, .3);--shadow-md: 0 4px 8px rgba(0, 0, 0, .4);--shadow-lg: 0 8px 16px rgba(0, 0, 0, .45);--shadow-xl: 0 12px 24px rgba(0, 0, 0, .5);--shadow-glow: 0 0 20px rgba(100, 165, 255, .3);--shadow-glow-md: 0 0 30px rgba(100, 165, 255, .35);--shadow-glow-lg: 0 0 40px rgba(100, 165, 255, .4);--shadow-glow-success: 0 0 20px rgba(52, 199, 89, .3);--shadow-glow-accent: 0 0 20px rgba(191, 90, 242, .3);--shadow-card: 0 0 0 1px rgba(255, 255, 255, .05), 0 4px 8px rgba(0, 0, 0, .4), inset 0 1px 0 rgba(255, 255, 255, .03);--shadow-card-hover: 0 0 0 1px rgba(255, 255, 255, .08), 0 8px 16px rgba(0, 0, 0, .45), 0 0 30px rgba(100, 165, 255, .15), inset 0 1px 0 rgba(255, 255, 255, .05);--gradient-primary: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));--gradient-secondary: linear-gradient(135deg, var(--color-primary), var(--color-secondary));--gradient-success: linear-gradient(135deg, var(--color-success), var(--color-success-light));--gradient-surface: linear-gradient(180deg, var(--color-bg-secondary) 0%, rgba(26, 26, 28, .95) 100%);--gradient-shimmer: linear-gradient(90deg, var(--color-surface-1) 0%, var(--color-surface-3) 50%, var(--color-surface-1) 100%);--color-objectives-bg: linear-gradient(135deg, rgba(94, 92, 230, .12), rgba(100, 165, 255, .15));--color-objectives-border: rgba(94, 92, 230, .25);--color-objectives-accent: #5E5CE6;--color-objectives-accent-light: #7A78EA;--color-objectives-heading: #7A78EA;--color-objectives-text: #A5A4F3;--color-objectives-bullet: #5E5CE6;--color-takeaways-bg: linear-gradient(135deg, rgba(255, 214, 10, .1), rgba(255, 159, 10, .08));--color-takeaways-border: #FFD60A;--color-takeaways-heading: #FFD60A;--color-takeaways-text: #FFE066;--color-takeaways-icon: #FFD60A;--color-takeaways-shadow: rgba(255, 214, 10, .15);--color-summary-bg: linear-gradient(135deg, rgba(52, 199, 89, .1), rgba(100, 210, 255, .08));--color-summary-border: #34C759;--color-summary-heading: #34C759;--color-summary-text: #6EE7B7;--color-summary-icon: #34C759;--color-summary-shadow: rgba(52, 199, 89, .15);--color-question-bg: var(--color-bg-secondary);--color-question-border: rgba(191, 90, 242, .25);--color-question-header-bg: linear-gradient(135deg, rgba(191, 90, 242, .15), rgba(94, 92, 230, .2));--color-question-number: #BF5AF2;--color-question-marks-bg: rgba(255, 214, 10, .2);--color-question-marks-text: #FFD60A;--color-question-shadow: rgba(191, 90, 242, .15);--color-question-shadow-hover: rgba(191, 90, 242, .25);--color-example-label: #34C759;--color-example-icon: #34C759;--color-concept-bg: rgba(94, 92, 230, .12);--color-concept-border: rgba(94, 92, 230, .25);--color-concept-icon: #7A78EA;--color-concept-label: #A5A4F3;--color-diagram-bg: var(--color-bg-tertiary);--color-diagram-border: var(--color-border);--color-diagram-icon-bg: linear-gradient(135deg, rgba(100, 165, 255, .2), rgba(94, 92, 230, .15));--color-diagram-icon: #64A5FF;--color-input-bg: rgba(255, 255, 255, .04);--color-input-border: var(--color-border);--color-input-border-focus: #64A5FF;--color-input-placeholder: var(--color-text-tertiary);--color-input-disabled-bg: var(--color-bg-tertiary);--btn-primary-bg: linear-gradient(135deg, #3B82F6, #2563EB);--btn-primary-bg-hover: linear-gradient(135deg, #2563EB, #1D4ED8);--btn-primary-text: #FFFFFF;--btn-primary-text-hover: #FFFFFF;--btn-hover-overlay: none;--btn-hover-overlay-opacity: 0;--color-submit-bg: linear-gradient(135deg, #3B82F6, #2563EB);--color-submit-shadow: rgba(59, 130, 246, .4);--color-next-btn-bg: linear-gradient(135deg, #3B82F6, #4F46E5);--color-next-btn-shadow: rgba(59, 130, 246, .4);--color-feedback-strengths: #34C759;--color-feedback-strengths-heading: #34C759;--color-feedback-improvements: #FFD60A;--color-feedback-tip-bg: rgba(100, 165, 255, .15);--color-feedback-tip-border: rgba(100, 165, 255, .3);--color-feedback-tip-text: #64A5FF;--color-model-answer-summary: #BF5AF2;--color-model-answer-bg: rgba(191, 90, 242, .12);--color-model-answer-border: rgba(191, 90, 242, .25)}[data-theme=dark] .card,[data-theme=dark] .card-glass{background:var(--color-glass);backdrop-filter:blur(40px) saturate(180%);-webkit-backdrop-filter:blur(40px) saturate(180%);border:1px solid var(--color-glass-border)}[data-theme=dark] .card:hover{background:var(--color-glass-hover);border-color:#ffffff1a}[data-theme=dark] .sidebar,[data-theme=dark] .main-content{background:var(--color-bg-primary)}[data-theme=dark] .btn-secondary{background:#ffffff0f;border:1px solid var(--color-border);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px)}[data-theme=dark] .btn-secondary:hover:not(:disabled){background:#ffffff1a;border-color:#ffffff26}[data-theme=dark] .input,[data-theme=dark] .select,[data-theme=dark] .textarea{background:var(--color-input-bg);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px)}[data-theme=dark] .input:focus,[data-theme=dark] .select:focus,[data-theme=dark] .textarea:focus{background:#ffffff0f;box-shadow:0 0 0 3px #64a5ff26}[data-theme=dark] .theme-switcher-dropdown,[data-theme=dark] .theme-switcher-panel,[data-theme=dark] .theme-switcher-popover{background:#1e1e22eb;backdrop-filter:blur(40px) saturate(180%);-webkit-backdrop-filter:blur(40px) saturate(180%);border:1px solid rgba(255,255,255,.1);box-shadow:var(--shadow-xl),0 0 0 1px #ffffff0d}[data-theme=dark] *:focus-visible{outline:none;box-shadow:0 0 0 3px #64a5ff66}[data-theme=dark] .katex{color:var(--color-text-primary)}[data-theme=dark] .katex-display{background:var(--color-bg-tertiary)}[data-theme=dark] .katex-error{background:#ff453a33;border-color:#ff453a66}[data-theme=light]{--color-primary: #3B82F6;--color-primary-light: #60A5FA;--color-primary-dark: #2563EB;--color-primary-subtle: rgba(59, 130, 246, .12);--color-secondary: #06B6D4;--color-secondary-light: #22D3EE;--color-secondary-dark: #0891B2;--color-accent: #8B5CF6;--color-accent-light: #A78BFA;--color-success: #22C55E;--color-success-light: #4ADE80;--color-success-bg: rgba(34, 197, 94, .12);--color-warning: #EAB308;--color-warning-bg: rgba(234, 179, 8, .12);--color-highlight: #EAB308;--color-highlight-subtle: rgba(234, 179, 8, .08);--color-highlight-bg: rgba(234, 179, 8, .15);--color-highlight-hover: rgba(234, 179, 8, .22);--color-highlight-active: rgba(234, 179, 8, .32);--color-error: #EF4444;--color-error-light: #F87171;--color-error-bg: rgba(239, 68, 68, .12);--color-bg-primary: #FFFFFF;--color-bg-secondary: #F8FAFC;--color-bg-tertiary: #F1F5F9;--color-bg-elevated: #FFFFFF;--color-bg-card: rgba(255, 255, 255, .78);--color-bg-modal: #FFFFFF;--color-bg-input: rgba(248, 250, 252, .6);--color-surface-1: rgba(0, 0, 0, .02);--color-surface-2: rgba(0, 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#FFF1F2}.entity-list{display:flex;flex-direction:column;gap:var(--space-4);max-width:1400px;margin:0 auto;overflow:hidden}.entity-list.loading,.entity-list.error{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:var(--space-4);min-height:300px;color:var(--color-text-secondary);background:var(--color-bg-card);border-radius:var(--radius-xl);box-shadow:var(--shadow-card)}.entity-list .loading-spinner{width:40px;height:40px;border:3px solid var(--color-surface-2);border-top-color:var(--color-primary);border-radius:50%;animation:spin 1s linear infinite}.entity-list-header{margin-bottom:var(--space-2);padding:var(--space-4) 0}.entity-list-header h1{font-family:var(--font-display);font-size:var(--text-3xl);font-weight:var(--font-bold);color:var(--color-text-primary);margin:0;letter-spacing:-.02em}.entity-list-header p{font-size:var(--text-base);color:var(--color-text-secondary);margin:var(--space-2) 0 0}.entity-list-toolbar{display:flex;justify-content:space-between;align-items:center;gap:var(--space-4);padding:var(--space-4);background:var(--color-bg-card);border-radius:var(--radius-xl);box-shadow:var(--shadow-card);border:1px solid var(--color-border-light);flex-wrap:wrap}.entity-list-toolbar-left{display:flex;align-items:center;gap:var(--space-3);flex:1}.entity-list-toolbar-right{display:flex;align-items:center;gap:var(--space-3)}.entity-list-view-selector{padding:var(--space-2) var(--space-4);font-size:var(--text-sm);font-weight:var(--font-medium);border:1px solid var(--color-border);border-radius:var(--radius-lg);background:var(--color-bg-input);color:var(--color-text-primary);min-width:180px;cursor:pointer;transition:all var(--transition-fast)}.entity-list-view-selector:hover{border-color:var(--color-primary);background:var(--color-surface-1)}.entity-list-view-selector:focus{outline:none;border-color:var(--color-primary);box-shadow:0 0 0 3px var(--color-primary-subtle)}.entity-list-search{position:relative;flex:1;max-width:320px}.entity-list-search-input{width:100%;padding:var(--space-2) var(--space-4);padding-left:var(--space-10);font-size:var(--text-sm);border:1px solid var(--color-border);border-radius:var(--radius-lg);background:var(--color-bg-input);color:var(--color-text-primary);transition:all var(--transition-fast)}.entity-list-search-input::placeholder{color:var(--color-text-muted)}.entity-list-search-input:hover{border-color:var(--color-primary);background:var(--color-surface-1)}.entity-list-search-input:focus{outline:none;border-color:var(--color-primary);box-shadow:0 0 0 3px var(--color-primary-subtle)}.entity-list-search .icon{position:absolute;left:var(--space-3);top:50%;transform:translateY(-50%);width:18px;height:18px;color:var(--color-text-muted);pointer-events:none}.entity-list .btn-icon{display:flex;align-items:center;justify-content:center;width:40px;height:40px;padding:0;border:1px solid var(--color-border);border-radius:var(--radius-lg);background:var(--color-bg-input);color:var(--color-text-secondary);cursor:pointer;transition:all var(--transition-fast)}.entity-list .btn-icon:hover{border-color:var(--color-primary);color:var(--color-primary);background:var(--color-primary-subtle)}.entity-list .btn-icon .icon{width:18px;height:18px}.entity-list .btn-icon.refresh-spin .icon{animation:refresh-rotate .6s ease-in-out}@keyframes refresh-rotate{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.entity-list .btn-primary{display:inline-flex;align-items:center;gap:var(--space-2);padding:var(--space-2) var(--space-4);font-size:var(--text-sm);font-weight:var(--font-semibold);color:#fff;background:var(--gradient-primary);border:none;border-radius:var(--radius-lg);cursor:pointer;transition:all var(--transition-fast);box-shadow:var(--shadow-sm)}.entity-list .btn-primary:hover{transform:translateY(-1px);box-shadow:var(--shadow-md),var(--shadow-glow)}.entity-list .btn-primary .icon{width:16px;height:16px}.entity-list-error{display:flex;align-items:center;gap:var(--space-3);padding:var(--space-4);background:var(--color-error-bg);border:1px solid var(--color-error);border-radius:var(--radius-lg);color:var(--color-error);font-size:var(--text-sm);font-weight:var(--font-medium)}.entity-list-error .icon,.error-icon{width:20px;height:20px;flex-shrink:0}.entity-list-table-container{overflow:hidden;border-radius:var(--radius-xl);background:var(--color-bg-card);box-shadow:var(--shadow-card);border:1px solid var(--color-border-light)}.entity-list-table{width:100%;border-collapse:collapse;font-size:var(--text-sm)}.entity-list-table thead{position:sticky;top:0;z-index:1}.entity-list-table th{padding:var(--space-4);text-align:left;font-weight:var(--font-semibold);font-size:var(--text-xs);text-transform:uppercase;letter-spacing:.05em;color:var(--color-text-secondary);background:var(--color-surface-2);border-bottom:2px solid var(--color-border);white-space:nowrap}.entity-list-table th.sortable{cursor:pointer;-webkit-user-select:none;user-select:none;transition:background var(--transition-fast)}.entity-list-table th.sortable:hover{background:var(--color-surface-3);color:var(--color-text-primary)}.entity-list-table th .th-content{display:flex;align-items:center;gap:var(--space-2)}.entity-list-table .sort-icon{width:14px;height:14px;color:var(--color-text-muted);transition:color var(--transition-fast)}.entity-list-table .sort-icon.asc,.entity-list-table .sort-icon.desc{color:var(--color-primary)}.entity-list-table td{padding:var(--space-4);color:var(--color-text-primary);border-bottom:1px solid var(--color-border-light);max-width:280px;transition:background var(--transition-fast)}.entity-list-table td .cell-text{display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;line-height:1.4;word-break:break-word}.entity-list-table tbody tr{transition:background var(--transition-fast)}.entity-list-table tbody tr:hover{background:var(--color-surface-1)}.entity-list-table tbody tr.clickable{cursor:pointer}.entity-list-table tbody tr.clickable:hover{background:var(--color-primary-subtle)}.entity-list-table tbody tr:last-child td{border-bottom:none}.entity-list-table .link-cell{color:var(--color-primary);font-weight:var(--font-semibold);cursor:pointer;transition:color var(--transition-fast)}.entity-list-table .link-cell:hover{color:var(--color-primary-dark);text-decoration:underline}.entity-list-table .radio-cell{width:40px;min-width:40px;max-width:40px;text-align:center;padding:var(--space-3)}.entity-list-table .radio-cell input[type=radio]{width:16px;height:16px;margin:0;cursor:pointer;accent-color:var(--color-primary)}.entity-list-table .loading-cell,.entity-list-table .empty-cell{text-align:center;padding:var(--space-12) var(--space-4);color:var(--color-text-muted)}.entity-list-table .loading-cell .loading-cell-content{display:inline-flex;align-items:center;justify-content:center;gap:var(--space-3)}.entity-list-table .loading-cell .loading-spinner{width:24px;height:24px;border-width:2px}.entity-list-pagination{display:flex;justify-content:space-between;align-items:center;gap:var(--space-4);padding:var(--space-4);background:var(--color-bg-card);border-radius:var(--radius-xl);box-shadow:var(--shadow-card);border:1px solid var(--color-border-light);flex-wrap:wrap}.pagination-info{font-size:var(--text-sm);color:var(--color-text-secondary)}.pagination-controls{display:flex;align-items:center;gap:var(--space-4)}.pagination-page-size{padding:var(--space-2) var(--space-3);font-size:var(--text-sm);font-weight:var(--font-medium);border:1px solid var(--color-border);border-radius:var(--radius-md);background:var(--color-bg-input);color:var(--color-text-primary);cursor:pointer;transition:all var(--transition-fast)}.pagination-page-size:hover{border-color:var(--color-primary)}.pagination-page-size:focus{outline:none;border-color:var(--color-primary);box-shadow:0 0 0 3px var(--color-primary-subtle)}.pagination-buttons{display:flex;align-items:center;gap:var(--space-1)}.pagination-buttons .btn{display:flex;align-items:center;justify-content:center;width:36px;height:36px;padding:0;border:1px solid var(--color-border);border-radius:var(--radius-md);background:var(--color-bg-input);color:var(--color-text-secondary);cursor:pointer;transition:all var(--transition-fast)}.pagination-buttons .btn:hover:not(:disabled){border-color:var(--color-primary);color:var(--color-primary);background:var(--color-primary-subtle)}.pagination-buttons .btn:disabled{opacity:.4;cursor:not-allowed}.pagination-buttons .btn .icon{width:16px;height:16px}.pagination-page-info{font-size:var(--text-sm);font-weight:var(--font-medium);color:var(--color-text-primary);padding:0 var(--space-3);min-width:100px;text-align:center}.entity-list .btn-secondary{display:inline-flex;align-items:center;gap:var(--space-2);padding:var(--space-2) var(--space-3);font-size:var(--text-sm);font-weight:var(--font-medium);color:var(--color-text-secondary);background:var(--color-bg-input);border:1px solid var(--color-border);border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition-fast)}.entity-list .btn-secondary:hover{border-color:var(--color-primary);color:var(--color-primary);background:var(--color-primary-subtle)}.entity-list .btn-secondary .icon{width:16px;height:16px}.builder-mode-toggle-switch{display:inline-flex;align-items:center;gap:var(--space-2);cursor:pointer;-webkit-user-select:none;user-select:none}.builder-mode-label{font-size:var(--text-xs);font-weight:var(--font-semibold);color:var(--color-text-secondary);white-space:nowrap}.toggle-track{position:relative;width:40px;height:22px;border-radius:11px;background:var(--color-border);cursor:pointer;transition:background var(--transition-fast);flex-shrink:0}.toggle-track:focus-visible{outline:2px solid var(--color-primary);outline-offset:2px}.toggle-track.active{background:var(--color-primary, #7c3aed)}.toggle-thumb{position:absolute;top:2px;left:2px;width:18px;height:18px;border-radius:50%;background:#fff;box-shadow:0 1px 3px #0003;transition:transform var(--transition-fast)}.toggle-track.active .toggle-thumb{transform:translate(18px)}@media(max-width:900px){.entity-list-table-container{overflow-x:auto}.entity-list-table th,.entity-list-table td{min-width:200px}.entity-list-table .radio-cell,.entity-list-table th:first-child:empty{min-width:40px}}@media(max-width:768px){.entity-list-toolbar{flex-direction:column;align-items:stretch}.entity-list-toolbar-left,.entity-list-toolbar-right{flex-wrap:wrap;justify-content:center}.entity-list-search{max-width:none;width:100%}.entity-list-view-selector{width:100%}.entity-list-pagination{flex-direction:column;align-items:stretch;gap:var(--space-3)}.pagination-info{text-align:center}.pagination-controls{justify-content:center;flex-wrap:wrap}.entity-list-header h1{font-size:var(--text-2xl)}.entity-list-table th,.entity-list-table td{padding:var(--space-3)}}.entity-list-table-container::-webkit-scrollbar{width:8px;height:8px}.entity-list-table-container::-webkit-scrollbar-track{background:var(--color-surface-1);border-radius:var(--radius-full)}.entity-list-table-container::-webkit-scrollbar-thumb{background:var(--color-border);border-radius:var(--radius-full)}.entity-list-table-container::-webkit-scrollbar-thumb:hover{background:var(--color-text-muted)}.entity-form{position:relative;display:flex;flex-direction:column;gap:var(--space-4);max-width:1000px;margin:0 auto}.entity-form.loading,.entity-form.error{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:var(--space-4);min-height:300px;color:var(--color-text-secondary);background:var(--color-bg-card);border-radius:var(--radius-xl);box-shadow:var(--shadow-card);border:1px solid var(--color-border-light)}.entity-form .loading-spinner{width:40px;height:40px;border:3px solid var(--color-surface-2);border-top-color:var(--color-primary);border-radius:50%;animation:spin 1s linear infinite}.entity-form-saving-overlay{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:var(--space-3);background:var(--color-glass, rgba(255, 255, 255, .85));border-radius:var(--radius-xl);z-index:10;color:var(--color-text-secondary);font-size:var(--text-sm);font-weight:var(--font-medium)}.entity-form-header{padding:var(--space-4) 0;margin-bottom:var(--space-2)}.entity-form-header h1{font-family:var(--font-display);font-size:var(--text-3xl);font-weight:var(--font-bold);color:var(--color-text-primary);margin:0;letter-spacing:-.02em}.entity-form-header p{font-size:var(--text-base);color:var(--color-text-secondary);margin:var(--space-2) 0 0}.entity-form-error{display:flex;align-items:center;gap:var(--space-3);padding:var(--space-4);background:var(--color-error-bg);border:1px solid var(--color-error);border-radius:var(--radius-lg);color:var(--color-error);font-size:var(--text-sm);font-weight:var(--font-medium)}.entity-form-error .icon,.error-icon{width:20px;height:20px;flex-shrink:0}.entity-form-content{display:flex;flex-direction:column;gap:var(--space-4)}.form-section{background:var(--color-bg-card);border:1px solid var(--color-border-light);border-radius:var(--radius-xl);padding:var(--space-6);box-shadow:var(--shadow-card);transition:box-shadow var(--transition-normal)}.form-section:hover{box-shadow:var(--shadow-lg)}.form-section-title{font-family:var(--font-display);font-size:var(--text-lg);font-weight:var(--font-semibold);color:var(--color-text-primary);margin:0 0 var(--space-5);padding-bottom:var(--space-4);border-bottom:2px solid var(--color-border-light);letter-spacing:-.01em}.form-section-fields{display:grid;gap:var(--space-5)}.form-field{display:flex;flex-direction:column;gap:var(--space-2);min-width:0}.form-field.disabled{opacity:.6}.form-field-label{font-size:var(--text-sm);font-weight:var(--font-semibold);color:var(--color-text-secondary);text-transform:uppercase;letter-spacing:.03em}.required-indicator{color:var(--color-error);margin-left:var(--space-1)}.form-field-input,.form-field-select,.form-field-textarea{padding:var(--space-3) var(--space-4);font-size:var(--text-base);font-family:var(--font-body);border:1px solid var(--color-border);border-radius:var(--radius-lg);background:var(--color-bg-input);color:var(--color-text-primary);transition:all var(--transition-fast)}.form-field-input:hover:not(:disabled),.form-field-select:hover:not(:disabled),.form-field-textarea:hover:not(:disabled){border-color:var(--color-primary);background:var(--color-surface-1)}.form-field-input:focus,.form-field-select:focus,.form-field-textarea:focus{outline:none;border-color:var(--color-primary);box-shadow:0 0 0 3px var(--color-primary-subtle);background:var(--color-bg-card)}.form-field-input:disabled,.form-field-select:disabled,.form-field-textarea:disabled{background:var(--color-surface-2);color:var(--color-text-muted);cursor:not-allowed;border-color:var(--color-border-light)}.form-field-input::placeholder,.form-field-textarea::placeholder{color:var(--color-text-muted)}.form-field-textarea{resize:vertical;min-height:100px}.form-field-datetime-wrapper{display:flex;align-items:center;padding:var(--space-3) var(--space-4);font-size:var(--text-base);font-family:var(--font-body);border:1px solid var(--color-border);border-radius:var(--radius-lg);background:var(--color-bg-input);color:var(--color-text-primary);cursor:pointer;transition:all var(--transition-fast)}.form-field-datetime-wrapper:hover:not(.disabled){border-color:var(--color-primary);background:var(--color-surface-1)}.form-field-datetime-wrapper.disabled{background:var(--color-surface-2);color:var(--color-text-muted);cursor:not-allowed;border-color:var(--color-border-light)}.form-field-datetime-display{flex:1;line-height:1.5}.form-field-datetime-display.is-placeholder{color:var(--color-text-muted)}.form-field-datetime-native{position:absolute;width:0;height:0;opacity:0;pointer-events:none}.form-field-datetime-icon{width:18px;height:18px;color:var(--color-text-secondary);flex-shrink:0;margin-left:var(--space-2)}.form-field-readonly{background:var(--color-surface-2);color:var(--color-text-secondary)}[data-theme=dark] .form-field-input[type=date],[data-theme=dark] .form-field-input[type=datetime-local]{color-scheme:dark}[data-theme=light] .form-field-input[type=date],[data-theme=light] .form-field-input[type=datetime-local]{color-scheme:light}.form-field-input[type=date]::-webkit-calendar-picker-indicator,.form-field-input[type=datetime-local]::-webkit-calendar-picker-indicator{cursor:pointer;opacity:.7;transition:opacity var(--transition-fast)}.form-field-input[type=date]::-webkit-calendar-picker-indicator:hover,.form-field-input[type=datetime-local]::-webkit-calendar-picker-indicator:hover{opacity:1}.form-field-select{appearance:none;-webkit-appearance:none;-moz-appearance:none;padding-right:var(--space-10, 2.5rem);background-image:url("data:image/svg+xml,%3Csvg width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%239ca3af' stroke-width='2' stroke-linecap='round' stroke-linejoin='round' xmlns='http://www.w3.org/2000/svg'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right var(--space-3) center;background-size:16px}[data-theme=dark] .form-field-select{color-scheme:dark}[data-theme=light] .form-field-select{color-scheme:light}.form-field-select option{background:var(--color-bg-primary);color:var(--color-text-primary);padding:var(--space-2)}.form-field-select option:hover,.form-field-select option:focus{background:var(--color-primary-subtle, rgba(59, 130, 246, .15));color:var(--color-text-primary)}.form-field-select option:checked{background:var(--color-primary);color:#fff}.form-field-checkbox-wrapper{display:flex;align-items:center;gap:var(--space-3);padding:var(--space-2) 0}.form-field-checkbox{width:20px;height:20px;cursor:pointer;accent-color:var(--color-primary);border-radius:var(--radius-sm)}.form-field-checkbox:disabled{cursor:not-allowed}.form-field-checkbox-label{font-size:var(--text-base);color:var(--color-text-primary);cursor:pointer}.form-field-multiselect{display:flex;flex-direction:column;gap:var(--space-2);padding:var(--space-2) 0}.form-field-multiselect-option{display:flex;align-items:center;gap:var(--space-2);font-size:var(--text-sm);color:var(--color-text-primary);cursor:pointer;padding:var(--space-2);border-radius:var(--radius-md);transition:background var(--transition-fast)}.form-field-multiselect-option:hover{background:var(--color-surface-1)}.form-field-multiselect-option input{width:18px;height:18px;accent-color:var(--color-primary)}.form-field-description{font-size:var(--text-xs);color:var(--color-text-muted)}.form-field-error{font-size:var(--text-xs);color:var(--color-error);font-weight:var(--font-medium)}.form-field.has-error .form-field-input,.form-field.has-error .form-field-select,.form-field.has-error .form-field-textarea{border-color:var(--color-error)}.form-field.has-error .form-field-input:focus,.form-field.has-error .form-field-select:focus,.form-field.has-error .form-field-textarea:focus{box-shadow:0 0 0 3px var(--color-error-bg)}.form-spacer{height:var(--space-4)}.entity-form-actions{display:flex;justify-content:flex-end;gap:var(--space-3);padding:var(--space-4);background:var(--color-bg-card);border:1px solid var(--color-border-light);border-radius:var(--radius-xl);box-shadow:var(--shadow-card)}.entity-form .btn-secondary{display:inline-flex;align-items:center;justify-content:center;gap:var(--space-2);min-width:100px;padding:var(--space-3) var(--space-5);font-size:var(--text-sm);font-weight:var(--font-semibold);color:var(--color-text-secondary);background:var(--color-bg-input);border:1px solid var(--color-border);border-radius:var(--radius-lg);cursor:pointer;transition:all var(--transition-fast)}.entity-form .btn-secondary:hover:not(:disabled){border-color:var(--color-primary);color:var(--color-primary);background:var(--color-primary-subtle)}.entity-form .btn-secondary:disabled{opacity:.5;cursor:not-allowed}.entity-form .btn-primary{display:inline-flex;align-items:center;justify-content:center;gap:var(--space-2);min-width:100px;padding:var(--space-3) var(--space-5);font-size:var(--text-sm);font-weight:var(--font-semibold);color:#fff;background:var(--gradient-primary);border:none;border-radius:var(--radius-lg);cursor:pointer;transition:all var(--transition-fast);box-shadow:var(--shadow-sm)}.entity-form .btn-primary:hover:not(:disabled){transform:translateY(-1px);box-shadow:var(--shadow-md),var(--shadow-glow)}.entity-form .btn-primary:disabled{opacity:.5;cursor:not-allowed;transform:none;box-shadow:none}.entity-form .btn-primary .icon{width:16px;height:16px}.entity-form .spinner-sm{width:16px;height:16px;border:2px solid rgba(255,255,255,.3);border-top-color:#fff;border-radius:50%;animation:spin 1s linear 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a:hover{text-decoration:underline}.legal-section{padding:8rem 1.5rem 5rem;min-height:100vh}.legal-container{max-width:800px;margin:0 auto}.legal-title{font-size:2.5rem;font-weight:700;margin-bottom:.5rem}.legal-date{color:var(--color-text-secondary);margin-bottom:2rem}.legal-divider{height:1px;background:var(--color-border);margin-bottom:2rem}.legal-section-title{font-size:1.25rem;font-weight:600;margin-top:2rem;margin-bottom:1rem}.legal-content{color:var(--color-text-secondary);line-height:1.7}.legal-content p{margin-bottom:1rem}.waitlist-section{padding:8rem 1.5rem 5rem;min-height:100vh;display:flex;align-items:center;justify-content:center}.waitlist-container{max-width:500px;margin:0 auto;text-align:center}.waitlist-icon{width:80px;height:80px;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,var(--color-primary),var(--color-accent, var(--color-primary)));border-radius:50%;margin:0 auto 2rem}.waitlist-icon svg{width:40px;height:40px;color:#fff}.waitlist-title{font-size:2rem;font-weight:700;margin-bottom:1rem;color:var(--color-text-primary)}.waitlist-subtitle{color:var(--color-text-secondary);line-height:1.6;margin-bottom:2rem}.waitlist-form{background:var(--color-bg-secondary);border:1px solid var(--color-border);border-radius:16px;padding:2rem;text-align:left}.waitlist-confirmation{background:var(--color-bg-secondary);border:1px solid var(--color-border);border-radius:16px;padding:2rem}.waitlist-confirmation-icon{width:64px;height:64px;display:flex;align-items:center;justify-content:center;background:#22c55e1a;border:2px solid #22C55E;border-radius:50%;margin:0 auto 1.5rem}.waitlist-confirmation-icon svg{width:32px;height:32px;color:#22c55e}.waitlist-info-row{display:flex;justify-content:space-between;padding:.75rem 0;border-bottom:1px solid var(--color-border)}.waitlist-info-row:last-child{border-bottom:none}.waitlist-info-label{color:var(--color-text-secondary)}.waitlist-info-value{font-weight:500}.waitlist-contact-hint{text-align:center;margin-top:2rem;color:var(--color-text-secondary);font-size:.875rem}.waitlist-contact-hint a{color:var(--color-primary);text-decoration:none}.waitlist-loading{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:5rem 2rem;animation:waitlist-fade-in .4s ease}@keyframes waitlist-fade-in{0%{opacity:0}to{opacity:1}}.waitlist-loading-ring{width:36px;height:36px;border:1.5px solid var(--color-border);border-top-color:var(--color-text-secondary);border-radius:50%;animation:waitlist-rotate .8s linear infinite;margin-bottom:1.5rem}@keyframes waitlist-rotate{to{transform:rotate(360deg)}}.waitlist-loading-label{font-size:.9375rem;color:var(--color-text-secondary);font-weight:400;letter-spacing:-.01em}.public-footer{background:var(--color-bg-secondary);border-top:1px solid var(--color-border);padding:4rem 1.5rem 2rem}.footer-container{max-width:1200px;margin:0 auto}.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:4rem;margin-bottom:3rem}.footer-brand{max-width:300px}.footer-logo{display:flex;align-items:center;gap:.75rem;margin-bottom:1rem;font-weight:700;font-size:1.25rem}.footer-tagline{color:var(--color-text-secondary);line-height:1.6}.footer-section-title{font-size:.875rem;font-weight:600;text-transform:uppercase;letter-spacing:.05em;margin-bottom:1rem;color:var(--color-text-primary)}.footer-links{list-style:none;padding:0;margin:0}.footer-link{margin-bottom:.75rem}.footer-link a{color:var(--color-text-secondary);text-decoration:none;font-size:.9375rem;transition:color .2s}.footer-link a:hover{color:var(--color-text-primary)}.footer-bottom{padding-top:2rem;border-top:1px solid 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var(--transition-fast)}a:hover{color:var(--color-primary)}small{font-size:var(--text-sm);color:var(--color-text-tertiary)}.app-container{display:flex;flex-direction:column;min-height:100vh;padding-bottom:calc(var(--bottom-nav-height) + var(--safe-area-bottom))}@media(min-width:1024px){.app-container{flex-direction:row;padding-bottom:0}}.main-content{flex:1;padding:var(--space-4);max-width:100%;overflow-x:clip}@media(min-width:1024px){.main-content{margin-left:var(--sidebar-width);padding:var(--space-6);transition:margin-left .2s ease}}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--space-2);padding:var(--space-3) var(--space-5);font-family:var(--font-body);font-size:var(--text-sm);font-weight:var(--font-semibold);line-height:1;border:none;border-radius:var(--radius-lg);cursor:pointer;transition:background .2s ease,box-shadow .2s ease,color .2s ease,border-color .2s ease,transform .15s ease,opacity .2s ease;white-space:nowrap;position:relative;overflow:hidden}.btn:after{content:"";position:absolute;inset:0;background:var(--btn-hover-overlay, linear-gradient(rgba(255,255,255,.1), transparent));opacity:0;transition:opacity .15s ease;pointer-events:none}.btn:hover:after{opacity:var(--btn-hover-overlay-opacity, 1)}.btn:disabled{opacity:.5;cursor:not-allowed}.btn:active:not(:disabled){transform:scale(.97)}.btn-primary{background:var(--btn-primary-bg, var(--gradient-primary));color:var(--btn-primary-text, #FFFFFF);box-shadow:var(--shadow-sm),var(--shadow-glow)}.btn-primary:hover:not(:disabled){background:var(--btn-primary-bg-hover, var(--btn-primary-bg, var(--gradient-primary)));color:var(--btn-primary-text-hover, var(--btn-primary-text, #FFFFFF));box-shadow:var(--shadow-md),var(--shadow-glow-md)}.btn-secondary{background:var(--color-bg-secondary);color:var(--color-text-primary);border:1px solid 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50%);pointer-events:none}.card:hover{border-color:var(--color-border-focus);box-shadow:var(--shadow-card-hover);transform:translateY(-4px)}.card-glass{background:var(--color-glass);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border:1px solid var(--color-glass-border)}.input,.select,.textarea{width:100%;padding:var(--space-3) var(--space-4);font-family:var(--font-body);font-size:var(--text-base);color:var(--color-text-primary);background:var(--color-bg-input);border:1px solid var(--color-border);border-radius:var(--radius-lg);transition:all .2s var(--ease-out-expo)}.input:focus,.select:focus,.textarea:focus{outline:none;border-color:var(--color-primary);box-shadow:0 0 0 3px var(--color-primary-subtle),0 0 20px #4f46e51a;background:var(--color-bg-secondary)}.input::placeholder{color:var(--color-text-muted);transition:opacity var(--transition-fast)}.input:focus::placeholder{opacity:.5}.badge{display:inline-flex;align-items:center;gap:var(--space-1);padding:var(--space-1) var(--space-2);font-size:var(--text-xs);font-weight:var(--font-semibold);border-radius:var(--radius-full);text-transform:uppercase;letter-spacing:.025em}.badge-primary{background:var(--color-primary-subtle);color:var(--color-primary-light)}.badge-success{background:var(--color-success-bg);color:var(--color-success)}.badge-warning{background:var(--color-warning-bg);color:var(--color-warning)}.badge-error{background:var(--color-error-bg);color:var(--color-error)}.badge-ai{background:var(--color-primary-subtle);color:var(--color-primary-light)}.badge-instructor{background:var(--color-warning-bg);color:var(--color-warning)}.badge-community{background:var(--color-success-bg);color:var(--color-success)}.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}.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-2{gap:var(--space-2)}.gap-3{gap:var(--space-3)}.gap-4{gap:var(--space-4)}.gap-6{gap:var(--space-6)}.text-center{text-align:center}.text-sm{font-size:var(--text-sm)}.text-secondary{color:var(--color-text-secondary)}.font-semibold{font-weight:var(--font-semibold)}.hidden{display:none}@media(min-width:768px){.md\:hidden{display:none}.md\:flex{display:flex}}@media(min-width:1024px){.lg\:hidden{display:none}.lg\:flex{display:flex}}@keyframes 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