:root{font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;color:#292d40;background:#f8f7f4;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;--paper: #f8f7f4;--surface: #fff;--ink: #292d40;--quiet: #666a79;--muted: #5e6273;--line: #e5e5eb;--accent: #4e5b9b;--accent-deep: #424e8a;--soft: #eaeefa;--tint: #f3f4fa;--mistake: #f5f2ee;--reading-size: 16px;--header-height: 88px}*{box-sizing:border-box}body{margin:0}button,input{font:inherit}button,a,input,summary{-webkit-tap-highlight-color:transparent}button{cursor:pointer;color:inherit}button{touch-action:manipulation}a{color:var(--accent)}h1,h2,h3,p{margin:0}button,summary,a,input{-webkit-text-size-adjust:100%}button:focus-visible,a:focus-visible,summary:focus-visible,input:focus-visible{outline:3px solid #7d8acb;outline-offset:4px}input[type=search]:focus-visible{outline-offset:0}::selection{background:#dce2fa;color:#263261}svg{flex-shrink:0}button{background:none;border:0}button:disabled{cursor:default}.sr-only{position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.skip-link{position:fixed;top:-80px;left:16px;background:var(--ink);color:#fff;padding:12px 20px;border-radius:10px;z-index:100;text-decoration:none}.skip-link:focus{top:12px}.site-header{height:var(--header-height);position:sticky;top:0;z-index:20;background:#fffffff7;border-bottom:1px solid var(--line)}.header-inner{max-width:1440px;margin:auto;height:100%;display:flex;gap:46px;align-items:center;padding:0 40px}.brand{display:flex;align-items:center;gap:11px;text-decoration:none;color:var(--ink);min-width:230px}.brand-mark{width:42px;height:42px;border-radius:13px;background:var(--soft);color:var(--accent);display:grid;place-items:center}.brand-text{font-size:23px;font-weight:650;letter-spacing:-.9px;line-height:1.1}.brand-text>span{color:var(--accent);font-weight:400}.brand-text small{display:block;font-size:11px;letter-spacing:.1px;font-weight:400;color:var(--muted);margin-top:7px}.header-search{display:flex;align-items:center;gap:10px;max-width:480px;width:100%;min-width:160px;color:var(--quiet);position:relative}.header-search input{height:40px;background:transparent;border:0;color:var(--ink);font-size:12px;width:100%;min-width:0;padding:0 25px 0 0}.header-search input::placeholder{color:var(--quiet)}.header-search input::-webkit-search-cancel-button{display:none}.header-search kbd{font-size:12px;background:var(--paper);border:1px solid var(--line);border-radius:5px;padding:1px 7px}.clear-search{position:absolute;right:27px;display:grid;place-items:center;width:26px;height:30px}.header-actions{margin-left:auto;display:flex;align-items:center;gap:18px;flex-shrink:0}.header-caption{font-size:11px;color:var(--quiet)}.header-divider{height:20px;width:1px;background:var(--line)}.icon-button{height:36px;width:36px;display:grid;place-items:center;border-radius:9px;color:var(--muted)}.icon-button:hover{background:var(--soft);color:var(--accent)}.font-picker{position:relative}.font-menu{position:absolute;right:0;top:44px;width:180px;padding:14px;background:#fff;border:1px solid var(--line);border-radius:13px;box-shadow:0 8px 32px #24283e14;z-index:25}.font-menu>span{display:block;margin-bottom:8px}.font-menu button{display:flex;align-items:center;justify-content:space-between;width:100%;padding:10px 8px;border-radius:6px;font-size:13px}.font-menu button:hover,.font-menu button[aria-pressed=true]{background:var(--soft);color:var(--accent)}.mobile-menu-button{display:none}.page-layout{display:grid;grid-template-columns:230px minmax(0,640px) minmax(155px,190px);gap:46px;max-width:1308px;margin:0 auto;padding:39px 32px 0}.eyebrow{text-transform:uppercase;font-size:10px;letter-spacing:1.6px;font-weight:650;line-height:1.6;color:var(--quiet)}.sidebar{min-width:0;position:relative;border-right:1px solid var(--line)}.sidebar-inner{position:sticky;top:calc(var(--header-height) + 26px);max-height:calc(100dvh - var(--header-height) - 44px);overflow-y:auto;overscroll-behavior:contain;padding:0 19px 18px 0;scrollbar-width:thin;scrollbar-color:#d4d8e6 transparent}.space-nav{display:grid;gap:4px;margin:15px 0 30px}.space-nav button{display:flex;gap:11px;align-items:center;width:100%;padding:11px 12px;text-align:left;color:var(--muted);font-size:12px;border-radius:9px}.space-nav button:hover{background:#efeff3}.space-nav button.selected{background:var(--soft);color:var(--accent);font-weight:600}.nav-count{margin-left:auto;font-size:11px;color:var(--accent)}.chapter-nav-heading{display:flex;align-items:center;justify-content:space-between;margin-bottom:15px}.path-count{font-size:10px;color:var(--quiet);padding:1px 6px;border:1px solid var(--line);border-radius:5px}.chapter-nav{display:grid;gap:3px}.all-chapters{display:flex;align-items:center;gap:10px;text-align:left;padding:10px 8px;border-radius:7px;font-size:12px;color:var(--muted);margin-bottom:6px}.all-chapters.selected{color:var(--accent);background:#eff1f9}.chapter-row{display:flex;align-items:center;border-radius:7px;color:var(--muted)}.chapter-row:hover{background:#f0f0f4}.chapter-row.selected{color:var(--accent);background:var(--soft)}.chapter-select{display:flex;align-items:flex-start;gap:8px;text-align:left;padding:10px 0 10px 7px;width:100%;font-size:11px;line-height:1.5}.chapter-number{font-size:9px;letter-spacing:.4px;line-height:1.8;min-width:15px;color:var(--quiet)}.chapter-count{margin-left:auto;color:var(--quiet);font-size:10px}.expand-chapter{display:grid;place-items:center;min-width:27px;align-self:stretch;color:var(--quiet);padding:0}.chapter-topics{border-left:1px solid #dce0ef;margin:3px 0 8px 14px;padding-left:8px}.chapter-topics a{display:flex;gap:7px;align-items:flex-start;font-size:11px;line-height:1.5;padding:7px 4px;text-decoration:none;color:var(--muted);border-radius:5px}.chapter-topics a[aria-current],.chapter-topics a:hover{color:var(--accent);background:#eff1f9}.chapter-topics svg{margin-top:3px}.topic-dot{width:4px;height:4px;min-width:4px;border-radius:50%;background:#a8b1d4;margin:7px 4px 0}.chapter-topics p{font-size:11px;line-height:1.6;color:var(--quiet);padding:4px}.sidebar-note{margin-top:28px;border-top:1px solid var(--line);padding:22px 8px 8px;color:var(--quiet);display:flex;gap:12px}.sidebar-note p{font-size:11px;line-height:1.9}.sidebar-note svg{color:#7c87b5;margin-top:4px}.main{min-width:0;outline:none}.intro{margin-bottom:25px}.intro-kicker{display:flex;align-items:center;justify-content:space-between;gap:12px}.intro-kicker .eyebrow{font-size:9px;letter-spacing:1.4px}.intro-count{font-size:10px;color:var(--quiet);white-space:nowrap}.intro h1{font-family:Lora,Georgia,Times New Roman,serif;font-weight:400;font-size:36px;letter-spacing:-1.15px;line-height:1.25;margin:11px 0 10px}.intro>p{color:var(--muted);font-size:13px;line-height:1.65}.level-tabs{display:flex;gap:4px;padding:5px;background:#eceef6;border-radius:12px}.level-tabs button{display:flex;align-items:center;justify-content:center;gap:8px;flex:1;min-width:0;padding:10px 7px;border-radius:8px;font-size:12px;color:var(--muted);font-weight:500;transition:background .15s}.level-tabs button[aria-selected=true]{background:#fff;box-shadow:0 2px 6px #242c4810;color:var(--accent-deep)}.level-tabs button:hover{color:var(--accent)}.tab-mark{display:flex}.tab-count{font-size:10px;opacity:1}.feed-context{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:17px 1px 21px;color:var(--quiet);font-size:11px;line-height:1.6}.feed-context>span{white-space:nowrap}.feed{display:grid;gap:26px}.lesson-card{background:#fff;border:1px solid var(--line);border-radius:17px;scroll-margin-top:calc(var(--header-height) + 20px);box-shadow:0 3px 5px #292d4002;overflow:hidden}.lesson-top{display:flex;align-items:center;justify-content:space-between;padding:24px 28px 0;gap:12px}.lesson-meta{display:flex;align-items:center;gap:11px;min-width:0}.chapter-symbol{height:34px;width:34px;min-width:34px;border-radius:10px;background:var(--soft);color:var(--accent);font-family:Georgia,serif;font-size:16px;display:grid;place-items:center}.chapter-label{display:block;font-size:11px;font-weight:550;line-height:1.5;color:#494e66}.reading-time{display:block;font-size:10px;color:var(--quiet);margin-top:2px}.read-label{color:var(--accent)}.level-badge{padding:5px 9px;background:#eff1fb;border-radius:20px;font-size:10px;color:var(--accent);white-space:nowrap}.lesson-body{padding:21px 28px 22px}.lesson-body h2{font-size:26px;font-weight:550;line-height:1.28;letter-spacing:-.7px;margin-bottom:13px;outline:none}.lesson-body h2:focus-visible{outline:2px solid var(--accent);outline-offset:6px;border-radius:3px}.definition{font-size:var(--reading-size);line-height:1.85;color:#464958;overflow-wrap:anywhere}.term-list{display:flex;flex-wrap:wrap;gap:6px;margin-top:17px}.term-list span{font-size:10px;color:var(--muted);padding:3px 8px;background:#f6f6f9;border:1px solid #eeeef3;border-radius:5px;line-height:1.6}.example-box{margin:24px 0;padding:19px 20px;background:var(--tint);border-radius:11px}.section-label{font-size:10px;font-weight:650;letter-spacing:1.2px;text-transform:uppercase;color:#656d90;line-height:1.6}.example-box>p{font-size:calc(var(--reading-size) - 2px);line-height:1.85;color:#4c526d;margin-top:10px;overflow-wrap:anywhere}.example-box pre{overflow:auto;padding:12px;background:#e8ebf7;border-radius:7px;font-size:12px;line-height:1.65}.interview{border-top:1px solid var(--line);padding-top:20px}.interview-question{font-size:calc(var(--reading-size) - 1px);line-height:1.65;font-weight:550;margin-top:9px;color:#363c56}.interview details{margin-top:11px}.interview summary{display:flex;align-items:center;gap:8px;width:fit-content;padding:6px 0;font-size:12px;color:var(--accent);list-style:none;cursor:pointer}.interview summary::-webkit-details-marker{display:none}.interview details[open] summary svg{transform:rotate(180deg)}.answer{margin:10px 0 0;border-left:2px solid #c7ceed;padding:2px 0 2px 15px}.answer p{font-size:calc(var(--reading-size) - 2px);line-height:1.85;color:var(--muted)}.answer-note{display:block;color:#62697f;font-size:11px;line-height:1.65;margin-top:12px;font-style:italic}.mistake{padding:14px 16px;background:var(--mistake);border-radius:9px;margin-top:20px}.mistake-title{font-size:11px;font-weight:600;color:#6e655e}.mistake p{font-size:calc(var(--reading-size) - 3px);line-height:1.75;margin-top:5px;color:#726a65}.source-link{display:inline-flex;gap:5px;align-items:center;color:var(--quiet);font-size:10px;text-decoration:none;margin-top:18px;padding:3px 0}.source-link:hover{text-decoration:underline;color:var(--accent)}.lesson-footer{border-top:1px solid var(--line);display:flex;justify-content:space-between;align-items:center;padding:12px 24px;gap:8px}.text-action{display:flex;gap:7px;align-items:center;font-size:11px;color:var(--muted);padding:8px 4px;border-radius:5px;white-space:nowrap}.text-action:hover,.text-action[aria-pressed=true]{color:var(--accent)}.text-action[aria-pressed=true]{font-weight:600}.footer-actions{display:flex;align-items:center;gap:13px}.share-action{width:29px;height:29px;color:#85899b}.right-rail{min-width:0}.rail-inner{position:sticky;top:calc(var(--header-height) + 36px)}.progress-number{font-family:Lora,Georgia,serif;font-size:40px;margin-top:15px;letter-spacing:-1.5px;line-height:1.2}.progress-number>span{font-size:20px;color:#62697c;margin-left:8px;letter-spacing:-.5px}.small-muted{color:var(--quiet);font-size:11px;line-height:1.7;margin-top:6px}progress{-moz-appearance:none;appearance:none;-webkit-appearance:none;width:100%;height:5px;display:block;background:#e2e5f1;border:0;border-radius:10px;overflow:hidden;margin:17px 0 13px}progress::-webkit-progress-bar{background:#e2e5f1;border-radius:10px}progress::-webkit-progress-value{background:#6978b7;border-radius:10px}progress::-moz-progress-bar{background:#6978b7;border-radius:10px}.rail-copy{color:var(--quiet);font-size:11px;line-height:1.85}.level-progress{margin-top:16px;display:flex;justify-content:space-between;color:var(--muted);font-size:10px}.rail-section{border-top:1px solid var(--line);margin-top:27px;padding-top:23px}.rail-icon{color:#7a86b9;display:block;margin-bottom:9px}.rail-section h2{font-family:Lora,Georgia,serif;font-size:22px;font-weight:400;letter-spacing:-.4px;margin-bottom:10px}.rail-section>p{color:var(--quiet);font-size:12px;line-height:1.9}.learning-loop{list-style:none;padding:0;margin:16px 0 0;display:grid;gap:13px}.learning-loop li{display:flex;align-items:center;gap:10px;font-size:11px;color:var(--muted)}.learning-loop li>span{height:20px;width:20px;display:grid;place-items:center;border-radius:50%;background:#eceef7;color:var(--accent);font-size:10px}.continue-button{margin-top:28px;text-align:left;border:1px solid #dfe3f1;background:#eff1f9;padding:15px;border-radius:11px;width:100%;display:grid;gap:8px}.continue-button span{font-size:9px;color:var(--quiet)}.continue-button strong{font-size:12px;font-weight:500;line-height:1.65;color:var(--accent-deep)}.continue-button svg{color:var(--accent);margin-top:2px}.continue-button:hover{background:#e8ecf9}.local-note{margin-top:25px;color:var(--quiet);font-size:10px;line-height:1.8}.local-note>span{font-weight:550}.local-note>p{margin-top:5px}.reset-button{display:flex;gap:5px;align-items:center;color:var(--quiet);padding:8px 0;font-size:10px;text-decoration:underline;text-underline-offset:3px;margin-top:5px}.feed-end{text-align:center;padding:48px 15px 33px;color:var(--muted)}.end-symbol{display:inline-grid;place-items:center;width:42px;height:42px;background:var(--soft);color:var(--accent);border-radius:50%;margin-bottom:16px}.feed-end h2{font-family:Lora,Georgia,serif;font-weight:400;font-size:25px;color:var(--ink);margin-bottom:9px}.feed-end p{font-size:12px;line-height:1.8}.next-level{margin:18px auto 0;display:flex;align-items:center;gap:8px;padding:10px 16px;border-radius:8px;background:var(--soft);color:var(--accent);font-size:12px}.end-caption{display:block;font-size:10px;color:var(--quiet);margin-top:25px}.site-footer{padding:23px 0 30px;border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:15px;flex-wrap:wrap;font-size:10px;line-height:1.8;color:var(--quiet)}.empty-state{border:1px solid var(--line);border-radius:16px;padding:50px 28px;text-align:center;background:#fff}.empty-icon{display:inline-grid;place-items:center;width:58px;height:58px;background:var(--soft);color:var(--accent);border-radius:17px;margin-bottom:20px}.empty-state h2{font-family:Lora,Georgia,serif;font-weight:400;font-size:26px;letter-spacing:-.5px}.empty-state p{font-size:13px;color:var(--muted);line-height:1.8;margin:13px auto 22px;max-width:350px}.primary-button,.secondary-button{display:inline-flex;align-items:center;justify-content:center;gap:10px;border-radius:8px;padding:12px 16px;font-size:12px;line-height:1.5}.primary-button{background:var(--accent);color:#fff}.primary-button:hover{background:var(--accent-deep)}.secondary-button{background:var(--soft);color:var(--accent)}.toast{position:fixed;bottom:24px;left:50%;transform:translate(-50%,15px);background:#303951;color:#fff;border-radius:12px;box-shadow:0 5px 22px #292d4020;display:flex;align-items:center;justify-content:center;gap:9px;z-index:50;padding:0;font-size:12px;line-height:1.6;opacity:0;pointer-events:none;max-width:calc(100vw - 32px);transition:opacity .16s,transform .16s}.toast.visible{opacity:1;transform:translate(-50%);padding:13px 19px}.back-top{position:fixed;bottom:24px;right:25px;background:#fff;border:1px solid var(--line);box-shadow:0 2px 12px #292d4009;width:40px;height:40px;z-index:15}.storage-note{background:var(--soft);color:var(--accent-deep);padding:12px 16px;border-radius:9px;font-size:12px;line-height:1.7;margin-bottom:18px}.text-large{--reading-size: 18px}.text-larger{--reading-size: 20px}.example-demo{margin-top:15px}.token-pieces{display:flex;flex-wrap:wrap;gap:7px}.token-pieces>span{background:#fff;color:var(--accent-deep);padding:8px 12px;border-radius:7px;border:1px solid #dce1f3;font-size:15px}.demo-bottom{display:flex;flex-wrap:wrap;justify-content:space-between;gap:10px;align-items:center;margin-top:12px}.demo-bottom small{font-size:10px;line-height:1.6;color:#626b8b}.demo-bottom button{display:flex;align-items:center;gap:6px;color:var(--accent);font-size:11px;padding:5px 0}.range-label{display:flex;justify-content:space-between;font-size:12px;color:#4c526d;gap:12px}.range-label strong{font-variant-numeric:tabular-nums;font-weight:550}.example-demo input[type=range]{width:100%;accent-color:var(--accent);margin:15px 0;display:block}.budget-bar{display:flex;gap:3px}.budget-bar span{flex:1;height:16px;border-radius:3px}.budget-bar .used{background:#7484c4}.budget-bar .free{background:#d4dbf5}.demo-bottom output{color:var(--accent-deep);font-size:11px;font-variant-numeric:tabular-nums}.flow-steps{display:grid;grid-template-columns:repeat(4,1fr);gap:6px}.flow-steps button{font-size:11px;padding:9px 3px;border-radius:7px;display:flex;gap:6px;justify-content:center;align-items:center;background:#fff;color:var(--muted)}.flow-steps button[aria-pressed=true]{background:var(--accent);color:#fff}.flow-steps button span{font-size:10px;opacity:.8}.flow-description{font-size:12px;line-height:1.8;margin-top:12px;color:#4c526d}.mobile-nav{padding:0;border:0;width:min(340px,90vw);max-width:none;height:100dvh;max-height:100dvh;margin:0 0 0 auto;background:var(--paper);color:var(--ink)}dialog::backdrop{background:#20263b66;-webkit-backdrop-filter:blur(3px);backdrop-filter:blur(3px)}.mobile-nav-content{padding:22px;min-height:100%;overflow-y:auto}.mobile-nav-top{display:flex;justify-content:space-between;align-items:center;font-size:17px;font-weight:550;margin-bottom:24px}.mobile-progress{margin-top:20px;padding-top:18px;border-top:1px solid var(--line);font-size:12px;color:var(--muted)}.nav-open{overflow:hidden}.reset-dialog{border:1px solid var(--line);background:#fff;color:var(--ink);padding:28px;max-width:min(450px,calc(100vw - 32px));border-radius:16px}.reset-dialog h2{font-family:Lora,Georgia,serif;font-size:27px;font-weight:400}.reset-dialog p{font-size:14px;line-height:1.85;color:var(--muted);margin:16px 0 24px}.reset-dialog>div{display:flex;flex-wrap:wrap;gap:10px;justify-content:flex-end}@media(min-width:1441px){.header-inner{padding:0 66px}.page-layout{gap:52px;padding-left:32px;padding-right:32px}}@media(max-width:1199px){.page-layout{grid-template-columns:200px minmax(0,1fr) 155px;gap:28px;padding:30px 24px 0}.header-inner{padding:0 24px;gap:28px}.brand{min-width:200px}.header-caption,.header-divider{display:none}.intro h1{font-size:32px}.lesson-top{padding:22px 24px 0}.lesson-body{padding:20px 24px}.intro-count{display:none}.lesson-body h2{font-size:25px}.sidebar-inner{padding-right:12px}.chapter-select{font-size:10px}.chapter-number{font-size:9px}}@media(max-width:999px){.page-layout{grid-template-columns:200px minmax(0,620px);gap:30px;max-width:950px}.right-rail{display:none}.header-search{max-width:none}.header-actions{margin-left:0}.brand{min-width:200px}.intro h1{font-size:35px}.chapter-select{font-size:11px}}@media(max-width:719px){:root{--header-height: 126px}.site-header{height:var(--header-height)}.header-inner{flex-wrap:wrap;gap:0 12px;align-content:center;padding:13px 20px}.brand{min-width:0;flex:1}.brand-mark{width:36px;height:36px;border-radius:10px}.brand-mark svg{width:21px}.brand-text{font-size:21px}.brand-text small{font-size:10px;margin-top:5px}.header-search{order:3;flex-basis:100%;margin-top:13px;background:#f5f5f8;border:1px solid #ececf1;border-radius:9px;padding:0 11px;height:36px}.header-search input{height:34px;font-size:12px}.header-search kbd{display:none}.clear-search{right:7px}.header-actions{gap:5px}.mobile-menu-button{display:grid}.header-search svg{width:15px}.page-layout{display:block;max-width:650px;padding:27px 20px 0}.sidebar{display:none}.intro{margin-bottom:22px}.intro h1{font-size:33px;letter-spacing:-1px}.intro-kicker .eyebrow{font-size:9px;letter-spacing:1.2px}.intro>p{font-size:12px}.level-tabs button{padding:11px 5px;font-size:11px;gap:6px}.tab-count{font-size:9px}.feed-context{font-size:10px;padding:15px 1px 20px}.feed{gap:22px}.lesson-top{padding:22px 22px 0}.lesson-body{padding:20px 22px}.lesson-body h2{font-size:26px}.definition{font-size:var(--reading-size)}.example-box{margin:21px 0;padding:17px}.lesson-footer{padding:11px 18px}.text-action{font-size:11px}.footer-actions{gap:6px}.back-top{bottom:20px;right:16px}.toast{bottom:72px;width:max-content}.site-footer{font-size:9px}.font-menu{right:-42px}.chapter-select{font-size:12px}.chapter-row .chapter-count{font-size:11px}.chapter-topics a{font-size:12px}.mobile-nav .space-nav button,.mobile-nav .all-chapters{font-size:13px}}@media(max-width:379px){.header-inner{padding-left:15px;padding-right:15px}.page-layout{padding:24px 12px 0}.intro h1{font-size:29px}.intro-kicker .eyebrow{font-size:8px}.level-tabs button{font-size:11px;gap:4px}.tab-count{display:none}.lesson-top{padding:19px 17px 0}.lesson-body{padding:18px 17px}.lesson-body h2{font-size:24px}.lesson-footer{padding:10px 12px}.text-action{font-size:10px;gap:5px}.footer-actions{gap:3px}.share-action{width:25px}.chapter-label{font-size:10px}.level-badge{font-size:9px;padding:4px 7px}.example-box{padding:14px}.flow-steps{grid-template-columns:repeat(2,1fr)}.brand-text{font-size:20px}.feed-context{gap:8px}.intro>p{font-size:11px}}@media(pointer:coarse){button,summary,.source-link,.chapter-topics a{min-height:44px}.expand-chapter{min-width:36px}.icon-button{width:44px;height:44px}.text-action{padding-top:10px;padding-bottom:10px}.share-action{width:34px}.clear-search{min-height:34px}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;transition:none!important;animation:none!important}}@media print{.site-header,.sidebar,.right-rail,.level-tabs,.lesson-footer,.toast,.back-top,.source-link,.feed-context,.feed-end,.site-footer{display:none!important}.page-layout{display:block;padding:0;max-width:none}.lesson-card{break-inside:avoid;box-shadow:none;margin-bottom:20px}.example-box,.mistake{background:#f5f5f5}.definition{font-size:12pt}.lesson-body h2{font-size:19pt}.intro{margin:0 0 20px}.feed{display:block}}
