:root{--bg:#141210;--surface:rgba(var(--tint-rgb), .06);--surface-hover:rgba(var(--tint-rgb), .1);--border:rgba(var(--tint-rgb), .08);--border-light:rgba(var(--tint-rgb), .06);--text-primary:#f0ede6;--text-secondary:#b8b2a6;--text-muted:#8a8478;--text-faint:#6a6458;--accent:#e8553a;--accent-strong:#d04a32;--accent-rgb:232, 85, 58;--accent-bg:rgba(var(--accent-rgb), .08);--accent-border:rgba(var(--accent-rgb), .2);--complete:#45b69c;--success:#45b69c;--success-bg:#45b69c1a;--success-border:#45b69c4d;--error:#dc3c3c;--error-bg:#dc3c3c14;--error-border:#dc3c3c40;--analogy-color:#8338ec;--analogy-bg:#8338ec0f;--analogy-border:#8338ec26;--top-bar-bg:#141210f2;--tint-rgb:255, 255, 255;--diagram-bg:#232120;--diagram-border:#2a2826;--widget-bg:#ffffff17;--honey-rgb:255, 213, 79;--font-serif:var(--font-instrument-serif), Georgia, "Times New Roman", serif;--font-sans:var(--work-sans-font), system-ui, -apple-system, sans-serif;--font-mono:ui-monospace, SFMono-Regular, Menlo, "JetBrains Mono", "Fira Code", monospace}:root[data-theme=light]{--tint-rgb:0, 83, 179;--bg:#fff;--surface:#fff;--surface-hover:#fff;--border:rgba(var(--tint-rgb), .08);--border-light:rgba(var(--tint-rgb), .06);--text-primary:#0a1a33;--text-secondary:#5f6b7a;--text-muted:#7c8593;--text-faint:#a3abb7;--accent:#0053b3;--accent-strong:#003d8c;--accent-rgb:0, 83, 179;--accent-bg:#0053b314;--accent-border:rgba(var(--accent-rgb), .22);--honey:#ffb900;--honey-strong:#b38200;--success:#1bab5c;--success-bg:#ecfff5;--success-border:#1bab5c52;--complete:#1bab5c;--error:#fb2c36;--error-bg:#fff0f1;--error-border:#fb2c3647;--analogy-color:#7b3fb8;--analogy-bg:#7b3fb81a;--analogy-border:#7b3fb842;--top-bar-bg:#f7f9ffe0;--card-raise:0 1px 2px #071c5d0f, 0 10px 28px #071c5d1a;--insight-text:#4a3824;--diagram-bg:#fff;--diagram-border:var(--border);--widget-bg:#f7f9ff;--honey-rgb:255, 185, 0;--brand:#e8553a}:root[data-theme=light] .chapter-page{--border:rgba(var(--tint-rgb), .12);--text-secondary:#475569;--text-muted:#475569;--text-faint:#475569}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-sans);background:var(--bg);color:var(--text-primary);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;text-rendering:optimizelegibility;font-feature-settings:"kern", "liga";scrollbar-width:none;font-weight:500}body::-webkit-scrollbar{display:none}.chapter-page{flex-direction:column;min-height:100vh;display:flex}.chapter-page--with-top-bar,.chapter-page--with-content-header{padding-top:calc(56px + env(safe-area-inset-top,0px))}html[data-embed="1"] .chapter-page--with-top-bar,html[data-embed="1"] .chapter-page--with-content-header{padding-top:0}.app-top-bar{background:var(--top-bar-bg);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-bottom:1px solid var(--border-light);z-index:100;flex-shrink:0;align-items:center;padding:0 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cubic-bezier(.34,1.56,.64,1),opacity .2s;animation:.45s cubic-bezier(.34,1.56,.64,1) both heroRingIconEnter}@keyframes heroRingIconEnter{0%{opacity:0;transform:translate(14px)}to{opacity:1;transform:translate(0)}}.hero-ring-icon-complete{animation:.7s ease-out forwards starSpin,2.5s ease-in-out .7s infinite starPulse}@keyframes starSpin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}@keyframes starPulse{0%,to{transform:scale(1)}50%{transform:scale(1.1)}}.hero-ring-percent{font-family:var(--font-sans);color:var(--text-primary);font-size:1.35rem;font-weight:600;line-height:1}.hero-ring-percent small{color:var(--text-muted);margin-left:1px;font-size:.75rem;font-weight:500}.chapter-label{letter-spacing:.12em;text-transform:uppercase;color:var(--accent);margin-bottom:14px;font-size:12px;font-weight:600}.chapter-title{font-family:var(--font-sans);color:var(--text-primary);margin:0 0 16px;font-size:clamp(36px,6vw,52px);font-weight:300;line-height:1.1}.continue-cta{background:rgba(var(--accent-rgb), .1);border:1px solid rgba(var(--accent-rgb), .25);color:var(--accent);font-family:var(--font-sans);cursor:pointer;border-radius:6px;align-items:center;gap:5px;margin-left:auto;padding:2px 10px;font-size:12px;font-weight:500;transition:all .2s;display:inline-flex}.continue-cta i{font-size:9px}.continue-cta:hover{background:rgba(var(--accent-rgb), .16);border-color:rgba(var(--accent-rgb), .35)}.chapter-subtitle{color:var(--text-muted);max-width:480px;margin:0;font-size:16px;line-height:1.6}.chapter-stats{color:var(--text-faint);align-items:center;gap:20px;margin-top:20px;font-size:13px;display:flex}.stats-actions{gap:8px;margin-left:auto;display:flex}.action-button.offline-saved .action-icon-hover,.action-button.offline-saved:hover .action-icon-default{display:none}.action-button.offline-saved:hover 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