@font-face{font-family:DM Sans;font-style:normal;font-display:swap;font-weight:400;src:url(/assets/dm-sans-latin-400-normal-CW0RaeGs.woff2) format("woff2"),url(/assets/dm-sans-latin-400-normal-BwCSEQnW.woff) format("woff")}@font-face{font-family:DM Sans;font-style:normal;font-display:swap;font-weight:500;src:url(/assets/dm-sans-latin-500-normal-B9HHJjqV.woff2) format("woff2"),url(/assets/dm-sans-latin-500-normal-Dr3UlScf.woff) format("woff")}@font-face{font-family:DM Sans;font-style:normal;font-display:swap;font-weight:600;src:url(/assets/dm-sans-latin-600-normal-Aqo67rzb.woff2) format("woff2"),url(/assets/dm-sans-latin-600-normal-BmdmIIQ2.woff) format("woff")}:root{--font-sans: "DM Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;--font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;--text-2xs: .6875rem;--text-xs: .75rem;--text-sm: .8125rem;--text-base: .9375rem;--text-md: 1rem;--text-lg: 1.125rem;--text-xl: 1.3125rem;--text-2xl: 1.5625rem;--text-3xl: 1.9375rem;--leading-tight: 1.2;--leading-snug: 1.4;--leading-normal: 1.55;--leading-relaxed: 1.72;--tracking-tight: -.02em;--tracking-heading: -.014em;--tracking-label: .06em;--space-1: 4px;--space-2: 8px;--space-3: 12px;--space-4: 16px;--space-5: 20px;--space-6: 24px;--space-7: 32px;--space-8: 40px;--space-9: 48px;--space-10: 64px;--space-11: 80px;--measure: 68ch;--measure-narrow: 52ch;--color-bg: #fbfaf8;--color-surface: #ffffff;--color-surface-subtle: #f4f1ec;--color-surface-sunken: #f0ece5;--color-text: #16151a;--color-text-secondary: #4a4750;--color-text-muted: #6f6b77;--color-text-inverse: #ffffff;--color-brand: #1d4ed8;--color-brand-hover: #1e40af;--color-brand-active: #172554;--color-brand-subtle: #eef3fe;--color-brand-border: #c3d6fb;--surface-inverse: #1c1917;--on-dark-text: #faf8f5;--on-dark-text-secondary: #cfc9c2;--on-dark-text-muted: #a8a29e;--on-dark-border: #57534e;--color-border: #e4ded4;--color-border-subtle: #efe9e0;--color-border-strong: #d3cabb;--color-success: #067647;--color-success-bg: #e7f6ee;--color-success-border: #b7e4cd;--color-warning: #b54708;--color-warning-bg: #fdf0e6;--color-warning-border: #f6d5b4;--color-error: #b42318;--color-error-bg: #fdeceb;--color-error-subtle: #fdeceb;--color-error-border: #f7cfcc;--color-info: #175cd3;--color-info-bg: #eaf1fd;--color-info-border: #c3d6fb;--tier-free-color: #4a4750;--tier-free-bg: #f0ece5;--tier-free-border: #ddd5c8;--tier-x-color: #1d4ed8;--tier-x-bg: #eef3fe;--tier-x-border: #c3d6fb;--tier-y-color: #6b21a8;--tier-y-bg: #f6effc;--tier-y-border: #e0cdf3;--shadow-xs: 0 1px 2px rgba(38, 32, 25, .05);--shadow-sm: 0 1px 2px rgba(38, 32, 25, .05), 0 2px 6px -2px rgba(38, 32, 25, .06);--shadow-md: 0 2px 4px -1px rgba(38, 32, 25, .05), 0 8px 20px -6px rgba(38, 32, 25, .09);--shadow-lg: 0 4px 8px -2px rgba(38, 32, 25, .06), 0 18px 36px -12px rgba(38, 32, 25, .13);--shadow-modal: 0 24px 56px -12px rgba(28, 22, 16, .22), 0 8px 20px -8px rgba(28, 22, 16, .12);--radius-sm: 6px;--radius-md: 8px;--radius-lg: 12px;--radius-xl: 16px;--radius-pill: 9999px;--z-base: 1;--z-raised: 10;--z-sticky: 100;--z-dropdown: 200;--z-modal-backdrop: 300;--z-modal: 400;--z-toast: 500;--z-tooltip: 600;--ease-out: cubic-bezier(.16, 1, .3, 1);--transition-fast: .15s var(--ease-out);--transition-normal: .22s var(--ease-out);--blur-chrome: 12px;color-scheme:light}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;-webkit-text-size-adjust:100%;scroll-behavior:smooth}body{font-family:var(--font-sans);background-color:var(--color-bg);color:var(--color-text);line-height:1.6;font-weight:400;caret-color:var(--color-brand);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}::selection{background-color:var(--color-brand);color:#fff}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:var(--color-bg)}::-webkit-scrollbar-thumb{background:var(--color-border-strong);border-radius:var(--radius-pill)}::-webkit-scrollbar-thumb:hover{background:var(--color-text-muted)}h1,h2,h3,h4,h5,h6{font-family:var(--font-sans);font-weight:600;color:var(--color-text);line-height:1.25;letter-spacing:-.025em}h1{font-size:2.25rem;letter-spacing:-.035em;margin-bottom:.75rem}h2{font-size:1.5rem;letter-spacing:-.025em;margin-bottom:.5rem}h3{font-size:1.15rem;margin-bottom:.5rem}p{color:var(--color-text-secondary);margin-bottom:1rem}p:last-child{margin-bottom:0}a{color:var(--color-brand);text-decoration:none;transition:color var(--transition-fast)}a:hover{color:var(--color-brand-hover)}button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible{outline:2px solid var(--color-brand);outline-offset:2px}.app-shell{min-height:100vh;display:flex;flex-direction:column;background:var(--color-bg)}.site-header{position:sticky;top:0;z-index:var(--z-sticky);display:flex;align-items:center;justify-content:space-between;gap:var(--space-4);min-height:60px;padding:0 var(--space-6);background:color-mix(in srgb,var(--color-bg) 88%,transparent);backdrop-filter:blur(var(--blur-chrome));-webkit-backdrop-filter:blur(var(--blur-chrome));border-bottom:1px solid var(--color-border-subtle);flex-shrink:0}.header-left{display:flex;align-items:center;gap:var(--space-3);min-width:0}.brand-link{display:inline-flex;align-items:center;gap:var(--space-2);min-width:0;color:var(--color-text);text-decoration:none;border-radius:var(--radius-md)}.brand-mascot-icon{width:28px;height:28px;border-radius:var(--radius-pill);object-fit:cover;flex-shrink:0}.brand-name{font-size:var(--text-base);font-weight:600;letter-spacing:var(--tracking-heading);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.header-nav{display:flex;align-items:center;gap:var(--space-1);padding:3px;background:var(--color-surface-subtle);border:1px solid var(--color-border-subtle);border-radius:var(--radius-pill);max-width:100%;overflow-x:auto;scrollbar-width:none}.header-nav::-webkit-scrollbar{display:none}.nav-link{padding:6px 14px;border-radius:var(--radius-pill);font-size:var(--text-sm);font-weight:500;white-space:nowrap;color:var(--color-text-secondary);text-decoration:none;transition:color var(--transition-fast),background-color var(--transition-fast)}.nav-link:hover{color:var(--color-text)}.nav-link.active{background:var(--color-surface);color:var(--color-brand);font-weight:600;box-shadow:var(--shadow-xs)}.header-actions{display:flex;align-items:center;gap:var(--space-3);flex-shrink:0}.user-nav-avatar{position:relative;display:inline-flex;align-items:center;justify-content:center;width:32px;height:32px;border-radius:var(--radius-pill);background:var(--color-brand);color:var(--color-text-inverse);font-size:var(--text-sm);font-weight:600;text-decoration:none;flex-shrink:0}.user-avatar-initial{line-height:1}.user-status-dot{position:absolute;right:-1px;bottom:-1px;width:9px;height:9px;border-radius:var(--radius-pill);background:var(--color-success);border:2px solid var(--color-bg)}.main-content{flex:1;width:100%;max-width:1200px;margin:0 auto;padding:var(--space-8) var(--space-6) var(--space-10)}.live-account{display:flex;flex-direction:column;gap:var(--space-5)}.skip-link{position:absolute;left:var(--space-4);top:var(--space-2);z-index:var(--z-toast);padding:var(--space-2) var(--space-4);background:var(--color-surface);border:1px solid var(--color-border-strong);border-radius:var(--radius-md);font-size:var(--text-sm);font-weight:600;color:var(--color-text);text-decoration:none;transform:translateY(-200%);transition:transform var(--transition-fast)}.skip-link:focus{transform:translateY(0)}.card{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-lg);padding:var(--space-6);box-shadow:var(--shadow-sm)}.card-quiet{box-shadow:none;background:var(--color-surface-subtle);border-color:var(--color-border-subtle)}.card-interactive{transition:border-color var(--transition-fast),box-shadow var(--transition-fast),transform var(--transition-fast)}.card-interactive:hover{border-color:var(--color-border-strong);box-shadow:var(--shadow-md)}.panel-head{display:flex;align-items:flex-start;justify-content:space-between;gap:var(--space-4);flex-wrap:wrap;margin-bottom:var(--space-4)}.panel-title{font-size:var(--text-lg);font-weight:600;letter-spacing:var(--tracking-heading);line-height:var(--leading-snug);margin:0}.panel-subtitle{margin:var(--space-1) 0 0;font-size:var(--text-sm);color:var(--color-text-muted);max-width:var(--measure-narrow)}.panel-label{font-size:var(--text-2xs);font-weight:600;letter-spacing:var(--tracking-label);text-transform:uppercase;color:var(--color-text-muted)}.button-primary,.button-secondary,.button-ghost{display:inline-flex;align-items:center;justify-content:center;gap:var(--space-2);padding:9px 16px;border-radius:var(--radius-md);font-family:inherit;font-size:var(--text-base);font-weight:600;line-height:1.2;white-space:nowrap;cursor:pointer;text-decoration:none;border:1px solid transparent;transition:background-color var(--transition-fast),border-color var(--transition-fast),color var(--transition-fast),box-shadow var(--transition-fast)}.button-primary{background:var(--color-brand);color:var(--color-text-inverse);box-shadow:var(--shadow-xs)}.button-primary:hover:not(:disabled){background:var(--color-brand-hover)}.button-primary:active:not(:disabled){background:var(--color-brand-active)}.button-secondary{background:var(--color-surface);color:var(--color-text);border-color:var(--color-border-strong);box-shadow:var(--shadow-xs)}.button-secondary:hover:not(:disabled){background:var(--color-surface-subtle);border-color:var(--color-text-muted)}.button-ghost{background:transparent;color:var(--color-text-secondary)}.button-ghost:hover:not(:disabled){background:var(--color-surface-subtle);color:var(--color-text)}.button-primary:disabled,.button-secondary:disabled,.button-ghost:disabled{opacity:.55;cursor:not-allowed}.button-small{padding:6px 12px;font-size:var(--text-sm)}.button-block{width:100%}.button-block,.course-card .button-primary{white-space:normal;text-align:center}.button-link{display:inline-flex;align-items:center;gap:var(--space-2);background:none;border:none;padding:0;font-family:inherit;font-size:var(--text-sm);font-weight:600;color:var(--color-brand);cursor:pointer;text-decoration:none;border-radius:var(--radius-sm)}.button-link:hover{color:var(--color-brand-hover);text-decoration:underline}.button-spinner{width:14px;height:14px;border:2px solid color-mix(in srgb,currentColor 30%,transparent);border-top-color:currentColor;border-radius:var(--radius-pill);animation:loopwit-spin .65s linear infinite;flex-shrink:0}@keyframes loopwit-spin{to{transform:rotate(360deg)}}.badge{display:inline-flex;align-items:center;gap:var(--space-1);padding:3px 9px;border-radius:var(--radius-pill);font-size:var(--text-2xs);font-weight:600;letter-spacing:.02em;white-space:nowrap;border:1px solid transparent}.badge-unlocked,.badge-active,.badge-completed{background:var(--color-success-bg);color:var(--color-success);border-color:var(--color-success-border)}.badge-preview{background:var(--color-info-bg);color:var(--color-info);border-color:var(--color-info-border)}.badge-trial{background:var(--color-warning-bg);color:var(--color-warning);border-color:var(--color-warning-border)}.badge-expired{background:var(--color-surface-sunken);color:var(--color-text-secondary);border-color:var(--color-border-strong)}.badge-locked{background:var(--color-surface-sunken);color:var(--color-text-muted);border-color:var(--color-border)}.badge-interactive{background:var(--tier-y-bg);color:var(--tier-y-color);border-color:var(--tier-y-border)}.notice{display:block;padding:var(--space-4) var(--space-5);border-radius:var(--radius-lg);border:1px solid var(--color-border);background:var(--color-surface);font-size:var(--text-base);color:var(--color-text-secondary);max-width:none}.notice-info{background:var(--color-info-bg);border-color:var(--color-info-border);color:var(--color-text)}.notice-error{background:var(--color-error-bg);border-color:var(--color-error-border);color:var(--color-error);font-weight:500}.notice-success{background:var(--color-success-bg);border-color:var(--color-success-border);color:var(--color-success)}.notice-actionable{display:flex;align-items:center;justify-content:space-between;gap:var(--space-4);flex-wrap:wrap}.notice p{margin:0}.tier-badge{display:inline-flex;align-items:center;gap:var(--space-2);padding:5px 12px;border-radius:var(--radius-pill);border:1px solid;font-family:inherit;font-size:var(--text-xs);font-weight:600;cursor:default;background:var(--tier-free-bg);color:var(--tier-free-color);border-color:var(--tier-free-border);transition:box-shadow var(--transition-fast),border-color var(--transition-fast)}.tier-badge-free{background:var(--tier-free-bg);color:var(--tier-free-color);border-color:var(--tier-free-border)}.tier-badge-tier_x{background:var(--tier-x-bg);color:var(--tier-x-color);border-color:var(--tier-x-border)}.tier-badge-tier_y{background:var(--tier-y-bg);color:var(--tier-y-color);border-color:var(--tier-y-border)}.tier-badge-interactive{cursor:pointer}.tier-badge-interactive:hover{box-shadow:var(--shadow-xs);border-color:currentColor}.tier-icon{width:13px;height:13px;flex-shrink:0}.tier-label{line-height:1}.tier-action-hint{font-size:var(--text-2xs);font-weight:500;opacity:.75}.loading-status{display:flex;align-items:center;gap:var(--space-3);padding:var(--space-8);justify-content:center;color:var(--color-text-muted);font-size:var(--text-base)}.skeleton{background:linear-gradient(90deg,var(--color-surface-subtle) 25%,var(--color-surface-sunken) 37%,var(--color-surface-subtle) 63%);background-size:400% 100%;animation:loopwit-shimmer 1.4s ease-in-out infinite;border-radius:var(--radius-sm)}@keyframes loopwit-shimmer{0%{background-position:100% 50%}to{background-position:0 50%}}.empty-state{display:flex;flex-direction:column;align-items:flex-start;gap:var(--space-2);padding:var(--space-7) var(--space-6);border:1px dashed var(--color-border-strong);border-radius:var(--radius-lg);background:var(--color-surface-subtle)}.empty-state h4{margin:0;font-size:var(--text-base);font-weight:600;color:var(--color-text)}.empty-state p{margin:0;font-size:var(--text-sm);color:var(--color-text-muted);max-width:var(--measure-narrow)}.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}.mono-id{font-family:var(--font-mono);font-size:.92em}.form-field{display:flex;flex-direction:column;gap:6px}.field-label-row{display:flex;align-items:baseline;justify-content:space-between;gap:var(--space-3)}.form-label{font-size:var(--text-sm);font-weight:600;color:var(--color-text)}.field-hint-text{font-size:var(--text-xs);color:var(--color-text-muted)}.input-with-icon{position:relative;display:flex;align-items:center}.input-svg-icon{position:absolute;left:12px;width:16px;height:16px;color:var(--color-text-muted);pointer-events:none}.form-input,.form-select,.form-textarea{width:100%;padding:10px 12px;font-family:inherit;font-size:var(--text-base);color:var(--color-text);background:var(--color-surface);border:1px solid var(--color-border-strong);border-radius:var(--radius-md);transition:border-color var(--transition-fast),box-shadow var(--transition-fast)}.input-with-icon .form-input{padding-left:36px}.input-with-icon .form-input[data-has-trailing=true]{padding-right:40px}.form-textarea{resize:vertical;min-height:96px;line-height:var(--leading-normal)}.form-input::placeholder,.form-textarea::placeholder{color:var(--color-text-muted);opacity:1}.form-input:hover:not(:disabled),.form-select:hover:not(:disabled),.form-textarea:hover:not(:disabled){border-color:var(--color-text-muted)}.form-input:focus-visible,.form-select:focus-visible,.form-textarea:focus-visible{outline:none;border-color:var(--color-brand);box-shadow:0 0 0 3px var(--color-brand-subtle)}.form-input:disabled,.form-select:disabled,.form-textarea:disabled{background:var(--color-surface-subtle);color:var(--color-text-muted);cursor:not-allowed}.form-input[aria-invalid=true]{border-color:var(--color-error)}.form-input[aria-invalid=true]:focus-visible{box-shadow:0 0 0 3px var(--color-error-bg)}.field-error{font-size:var(--text-xs);color:var(--color-error);font-weight:500}.password-toggle-btn{position:absolute;right:8px;display:inline-flex;align-items:center;justify-content:center;width:28px;height:28px;padding:0;background:none;border:none;border-radius:var(--radius-sm);color:var(--color-text-muted);cursor:pointer;transition:color var(--transition-fast),background-color var(--transition-fast)}.password-toggle-btn:hover{color:var(--color-text);background:var(--color-surface-subtle)}.button-oauth{display:inline-flex;align-items:center;justify-content:center;gap:var(--space-2);width:100%;padding:10px 16px;font-family:inherit;font-size:var(--text-base);font-weight:600;color:var(--color-text);background:var(--color-surface);border:1px solid var(--color-border-strong);border-radius:var(--radius-md);cursor:pointer;transition:background-color var(--transition-fast),border-color var(--transition-fast),box-shadow var(--transition-fast)}.button-oauth:hover:not(:disabled){background:var(--color-surface-subtle);border-color:var(--color-text-muted);box-shadow:var(--shadow-xs)}.button-oauth:disabled{opacity:.55;cursor:not-allowed}.button-oauth svg{width:17px;height:17px;flex-shrink:0}.auth-divider{display:flex;align-items:center;gap:var(--space-3)}.auth-divider-line{flex:1;height:1px;background:var(--color-border)}.auth-divider-text{font-size:var(--text-xs);color:var(--color-text-muted);white-space:nowrap}.app-auth-fullscreen{min-height:100vh;background:var(--color-bg)}.auth-split{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,1fr);min-height:100vh}.auth-showcase{position:relative;display:flex;flex-direction:column;justify-content:space-between;gap:var(--space-8);padding:var(--space-9) var(--space-9) var(--space-8);overflow:hidden;background:var(--color-brand-active);color:var(--color-text-inverse);isolation:isolate}.auth-showcase-media{position:absolute;inset:0;z-index:-2;width:100%;height:100%;object-fit:cover;opacity:.42}.auth-showcase:after{content:"";position:absolute;inset:0;z-index:-1;background:linear-gradient(200deg,color-mix(in srgb,var(--color-brand) 62%,transparent) 0%,color-mix(in srgb,var(--color-brand-active) 88%,transparent) 55%,var(--color-brand-active) 100%)}.auth-showcase-brand{color:var(--color-text-inverse);display:inline-flex;align-items:center;gap:var(--space-3);font-size:var(--text-lg);font-weight:600;letter-spacing:var(--tracking-heading)}.auth-showcase-brand img{width:34px;height:34px;border-radius:var(--radius-pill);object-fit:cover;border:1px solid rgba(255,255,255,.28)}.auth-showcase-body{max-width:30ch}.auth-showcase-title{margin:0;color:var(--color-text-inverse);font-size:var(--text-3xl);font-weight:600;line-height:var(--leading-tight);letter-spacing:var(--tracking-tight);text-wrap:balance}.auth-showcase-lede{margin:var(--space-4) 0 0;font-size:var(--text-md);line-height:var(--leading-normal);color:#ffffffd1;max-width:38ch}.auth-showcase-points{list-style:none;margin:var(--space-7) 0 0;padding:0;display:flex;flex-direction:column;gap:var(--space-3)}.auth-showcase-points li{display:flex;align-items:flex-start;gap:var(--space-3);font-size:var(--text-base);color:#ffffffe6}.auth-point-check{display:inline-flex;align-items:center;justify-content:center;width:20px;height:20px;flex-shrink:0;margin-top:1px;border-radius:var(--radius-pill);background:#ffffff29;border:1px solid rgba(255,255,255,.24)}.auth-point-check svg{width:11px;height:11px}.auth-showcase-foot{font-size:var(--text-sm);color:#ffffffa8}.auth-form-column{display:flex;align-items:center;justify-content:center;padding:var(--space-9) var(--space-6);background:var(--color-bg)}.auth-form-inner{width:100%;max-width:400px;display:flex;flex-direction:column;gap:var(--space-5)}.auth-back-button{align-self:flex-start;display:inline-flex;align-items:center;gap:6px;padding:6px 10px 6px 6px;margin-bottom:var(--space-1);background:none;border:none;border-radius:var(--radius-md);font-family:inherit;font-size:var(--text-sm);font-weight:500;color:var(--color-text-muted);cursor:pointer;transition:color var(--transition-fast),background-color var(--transition-fast)}.auth-back-button:hover{color:var(--color-text);background:var(--color-surface-subtle)}.auth-heading{margin:0}.auth-title{margin:0;font-size:var(--text-2xl);font-weight:600;letter-spacing:var(--tracking-tight);line-height:var(--leading-tight)}.auth-subtitle{margin:6px 0 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h3{margin:0;font-size:var(--text-lg);font-weight:600;letter-spacing:var(--tracking-heading)}.auth-notice-card p{margin:0;font-size:var(--text-base);color:var(--color-text-secondary);max-width:40ch}.classes-header{display:flex;align-items:flex-start;justify-content:space-between;gap:24px;margin-bottom:28px}.classes-header-left{display:flex;flex-direction:column;gap:10px}.classes-pill-badge{display:inline-flex;align-items:center;gap:8px;background:var(--color-brand-subtle);color:var(--color-brand);border:1px solid var(--color-brand-border);padding:4px 12px;border-radius:var(--radius-pill);font-size:.8125rem;font-weight:700;width:fit-content}.classes-subtitle{max-width:68ch;font-size:.95rem;color:var(--color-text-secondary);line-height:1.6}.classes-preview-banner{display:flex;justify-content:space-between;align-items:center;gap:24px;margin-bottom:36px;padding:24px 28px;border-radius:var(--radius-lg);border:1.5px solid rgba(191,219,254,.9);background:#f0f7ff;box-shadow:0 8px 24px -6px 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24px}.outcome-item{display:flex;align-items:flex-start;gap:12px;font-size:.875rem;color:var(--color-text);line-height:1.5}.outcome-check{color:var(--color-success);flex-shrink:0;margin-top:2px}.syllabus-header-row{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px}.syllabus-stats{font-size:.8125rem;color:var(--color-text-secondary)}.module-title-area{display:flex;align-items:center;gap:10px}.module-chevron{color:var(--color-text-muted);transition:transform var(--transition-fast)}.lesson-icon{display:grid;place-items:center;color:var(--color-brand);flex-shrink:0}.udemy-sidebar-column{position:sticky;top:84px}.sticky-course-card{overflow:hidden;padding:0;border-radius:var(--radius-md);box-shadow:var(--shadow-lg)}.sticky-preview-banner{position:relative;width:100%;aspect-ratio:16 / 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h4{font-size:.875rem;margin-bottom:12px}.sticky-features-list ul{list-style:none;display:flex;flex-direction:column;gap:10px}.sticky-features-list li{display:flex;align-items:flex-start;gap:10px;font-size:.8125rem;color:var(--color-text-secondary);line-height:1.4}.sticky-features-list li svg{color:var(--color-brand);flex-shrink:0;margin-top:2px}.interactive-mental-model{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-md);padding:24px;margin-bottom:28px}.model-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px}.model-mascot-badge{display:flex;align-items:center;gap:10px;font-size:.95rem;color:var(--color-text)}.model-description{font-size:.9rem;color:var(--color-text-secondary);line-height:1.6;margin-bottom:20px;max-width:60ch}.linked-list-stage{display:flex;align-items:center;justify-content:center;flex-wrap:wrap;gap:14px;background:var(--color-surface-subtle);border:1px solid 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.friend-role-pill{background:var(--color-brand);color:#fff}.friend-icon{color:var(--color-text-secondary);display:grid;place-items:center}.friend-name{font-size:1rem;color:var(--color-text)}.friend-pointer{font-size:.75rem;color:var(--color-brand);font-weight:600}.friend-pointer-null{font-size:.75rem;color:var(--color-error);font-weight:600}.pointer-arrow-indicator{color:var(--color-brand);display:grid;place-items:center}.model-mascot-tip{background:var(--color-brand-subtle);border:1px solid var(--color-brand-border);border-radius:var(--radius-sm);padding:12px 16px;font-size:.8125rem;color:var(--color-brand-hover);line-height:1.5}.lesson-viewer{width:100%;max-width:820px;margin:0 auto;display:flex;flex-direction:column}.lesson-viewer-nav{margin-bottom:var(--space-5)}.lesson-back-link{display:inline-flex;align-items:center;gap:6px;font-size:var(--text-sm);font-weight:500;color:var(--color-text-muted);text-decoration:none;padding:4px 8px 4px 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