.learning-shell{--learn-green: #31594e;--learn-soft: #e5ece3;--learn-orange: #a84d2e;width:min(1180px,calc(100% - 48px));margin:auto;padding-bottom:64px}.learning-hero{padding:56px 0 40px}.hub-hero{padding-top:80px;padding-bottom:56px}.learning-hero h1{margin:0;font-family:var(--serif);font-size:clamp(2.7rem,5.7vw,5.3rem);line-height:1.15;letter-spacing:-.045em;font-weight:720}.learning-hero h1 em{color:var(--learn-green);font-style:normal}.learning-lead{max-width:710px;color:#655d54;font-size:1.05rem;margin:22px 0}.learning-meta,.lesson-tags{display:flex;flex-wrap:wrap;gap:10px 22px;font-size:.8rem;color:#655d54}.learning-meta span:before{content:"·";margin-right:8px;color:var(--learn-green);font-weight:900}.lesson-feature{display:grid;grid-template-columns:1fr 1fr;border:1px solid #b9c9bd;border-radius:26px;overflow:hidden;text-decoration:none;background:#fffaf2;transition:box-shadow .2s}.lesson-feature:hover{box-shadow:0 12px 35px #31594e14}.lesson-feature-copy{padding:44px}.lesson-feature h2{margin:0;font-family:var(--serif);font-size:clamp(2rem,3.5vw,3.2rem);letter-spacing:-.03em}.lesson-feature-copy>p:not(.eyebrow){color:#655d54;margin:18px 0 25px}.lesson-tags{gap:8px}.lesson-tags span{border:1px solid var(--line);border-radius:5px;padding:2px 9px}.lesson-start{display:inline-flex;gap:56px;align-items:center;margin-top:32px;background:var(--learn-green);color:#fff;padding:12px 20px;border-radius:8px;font-size:.9rem;font-weight:650}.lesson-feature-art{position:relative;min-height:350px;background:var(--learn-soft);overflow:hidden;display:flex;justify-content:center;flex-direction:column;align-items:flex-start;padding-left:9%}.art-label{font-size:.8rem;margin-left:40px;margin-bottom:18px;color:#4c685d}.cookie-drawing{position:relative;width:126px;height:126px;border:3px solid #976430;border-radius:50%;background:#e8b771;box-shadow:inset -8px -7px #dba45c,0 9px #31594e12;transform:rotate(-12deg)}.cookie-drawing i{position:absolute;width:14px;height:14px;background:#805b3c;border-radius:40%}.cookie-drawing i:nth-child(1){top:24px;left:30px;transform:rotate(25deg)}.cookie-drawing i:nth-child(2){top:33px;right:21px}.cookie-drawing i:nth-child(3){bottom:24px;left:24px}.cookie-drawing i:nth-child(4){bottom:22px;right:27px;transform:rotate(25deg)}.cookie-drawing i:nth-child(5){top:56px;left:55px;width:10px;height:10px}.art-caption{font-size:.73rem;margin:22px 0 0 -12px;color:#4c685d}.art-connection{position:absolute;left:40%;top:44%;color:#4c685d;font:.75rem ui-monospace,monospace}.art-connection span{display:block;font-size:2rem;line-height:1;text-align:center}.session-drawing{position:absolute;right:8%;top:25%;display:grid;gap:9px;padding:20px;background:#fffaf2;border:1px solid #b9c9bd;border-radius:12px;transform:rotate(6deg);box-shadow:7px 8px #b9c9bd;font-size:.78rem}.session-drawing>span:first-child{color:#52695f;font-size:.7rem}.session-drawing b{font-family:ui-monospace,monospace;font-size:1.1rem}.session-drawing hr{width:100%;border:0;border-top:1px solid var(--line);margin:0}.learning-footnote{display:flex;justify-content:space-between;gap:20px;padding-top:28px;color:#655d54;font-size:.85rem}.learning-footnote a{text-underline-offset:4px}.lesson-breadcrumb{display:flex;align-items:center;flex-wrap:wrap;gap:6px 10px;font-size:.8rem;color:#655d54;margin-bottom:24px}.lesson-breadcrumb a{text-underline-offset:4px}.lesson-hero-row{display:flex;gap:20px;align-items:flex-end;justify-content:space-between}.lesson-hero-row h1{font-size:clamp(2.5rem,5vw,4.5rem)}.lesson-number{color:var(--learn-green);font:italic 5rem var(--serif);opacity:.4}.chapter-nav{display:flex;gap:26px;border-bottom:1px solid var(--line);margin:0 0 36px;padding-bottom:16px;flex-wrap:wrap}.chapter-nav a{text-decoration:none;font-size:.85rem;font-weight:650}.chapter-nav span{color:#9b5840;font:.7rem ui-monospace,monospace;margin-right:6px}.lesson-section{scroll-margin-top:110px;margin-bottom:64px}.lesson-heading{display:flex;justify-content:space-between;gap:24px;align-items:center;margin-bottom:20px}.lesson-heading h2{margin:0;font-size:clamp(1.4rem,3vw,1.9rem);font-family:var(--serif)}.lesson-heading p{margin:4px 0 0;color:#655d54;font-size:.9rem}.chapter-badge{color:#52695f;font:.75rem ui-monospace,monospace;white-space:nowrap}.animation-player{background:#fffaf2;border:1px solid #c7cbbd;border-radius:20px;overflow:hidden}.step-list{display:grid;grid-template-columns:repeat(6,1fr);gap:4px;padding:20px 24px 0;margin:0;list-style:none}.step-list button{display:flex;gap:8px;align-items:center;text-align:left;width:100%;padding:8px 2px 14px;background:none;border:0;border-bottom:2px solid #e6dfd3;font-size:.8rem;color:#70685e;cursor:pointer}.step-list button b{display:grid;place-items:center;min-width:22px;height:22px;border:1px solid #d7d1c5;border-radius:50%;font:.7rem ui-monospace,monospace}.step-list [aria-current=step]{border-color:var(--learn-green);color:var(--learn-green);font-weight:750}.step-list [aria-current=step] b{background:var(--learn-green);color:#fff;border-color:var(--learn-green)}.film-stage{position:relative;scroll-margin-top:86px;margin:20px 14px 16px;border:1px solid #e2e3d4;border-radius:12px;overflow:hidden;background:#f5f7ed}.film-topline{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:11px 18px;border-bottom:1px solid #e2e3d4;color:#657459;font-size:.72rem}.film-topline>span:first-child{display:flex;gap:8px;align-items:center}.film-topline i{width:6px;height:6px;border-radius:50%;background:#5f805c}#cookie-film{display:block;width:100%;height:auto;font-family:var(--sans)}.film-route{stroke:#99b392;stroke-width:1.5;stroke-dasharray:4 6;fill:none}.response-route{stroke:#c1ad7e}.film-route-label{fill:#72846b;font-size:12px}.film-node-shadow{fill:#dbe3d3;opacity:.55}.film-node{fill:#fffdf7;stroke:#c2cdbb;stroke-width:1.5}.film-node-title{fill:#31594e;font-weight:750;font-size:19px}.film-node-type{fill:#79816c;font-size:12px}.film-address{fill:#5e7159;font:11px ui-monospace,monospace}.film-user{fill:#393e30;font-size:17px;font-weight:700}.film-small{fill:#718065;font-size:12px}.film-tiny{fill:#8b7651;font-size:10px}.film-button-label{fill:#5e7753;font-size:11px}.film-storage-label{fill:#6c775e;font-size:12px}.film-id{fill:#526d3c;font:12px ui-monospace,monospace}.film-server-status{fill:#4c6341;font-size:14px;font-weight:650}.film-record-state{fill:#638755;font-size:12px}.film-expired-label{fill:#a4583a;font-size:13px;font-weight:750}.film-packet-title{fill:#35543c;font:650 16px ui-monospace,monospace}.film-packet-subtitle{fill:#687c56;font:11px ui-monospace,var(--sans)}.film-ticket-id{fill:#895f2a;font:700 14px ui-monospace,monospace}.film-action-caption{fill:#69795c;font-size:13px;font-weight:600}.film-start{position:absolute;left:50%;top:52%;transform:translate(-50%,-50%);display:flex;align-items:center;gap:12px;white-space:nowrap;border:1px solid #476b50;color:#fffaf2;background:#31594e;padding:15px 22px;border-radius:100px;box-shadow:0 8px 24px #244f3f24;cursor:pointer;font-size:.95rem;font-weight:700}.film-start>span:first-child{display:grid;place-items:center;width:32px;height:32px;border:1px solid #b9ccb377;border-radius:50%;font-size:.8rem}.film-start:hover{background:#234e40}.film-timeline{display:flex;align-items:center;gap:12px;padding:18px 28px 0;font-size:.72rem;color:#718065}.film-timeline input{--film-progress: 0%;appearance:none;flex:1;min-width:0;height:5px;border-radius:4px;background:linear-gradient(to right,#53784d var(--film-progress),#e1e5d5 var(--film-progress));cursor:pointer}.film-timeline input::-webkit-slider-thumb{appearance:none;width:14px;height:14px;border-radius:50%;background:#31594e;border:2px solid #fffdf7;box-shadow:0 0 0 1px #7c946b}.film-timeline input::-moz-range-thumb{width:11px;height:11px;border-radius:50%;background:#31594e;border:2px solid #fffdf7}.film-timeline output{white-space:nowrap;font:.7rem ui-monospace,monospace}.film-speed{display:flex;align-items:center;gap:6px;font-size:.72rem;color:#718065;margin-left:8px}.film-speed select{padding:5px;border:1px solid #c0c7b3;background:#fffaf2;border-radius:5px;min-height:34px;font-size:.75rem;color:#526d45}.step-explanation{margin:0 28px;background:#31594e;color:#fffaf2;border-radius:9px;padding:18px 20px;display:grid;grid-template-columns:34px 1fr;gap:14px}.step-explanation>span{color:#c2d7c4;font:1.5rem var(--serif)}.step-explanation h3{margin:0 0 5px;font-size:1rem}.step-explanation p{margin:0;color:#e3ebe0;font-size:.85rem}.player-controls{display:flex;flex-wrap:wrap;gap:8px;align-items:center;padding:20px 28px}.learn-button{background:#fffaf2;color:#3f493e;border:1px solid #bbbfb0;padding:9px 14px;border-radius:7px;cursor:pointer;font-size:.82rem;min-height:42px}.learn-button.primary{color:#fff;background:var(--learn-green);border-color:var(--learn-green)}.learn-button:hover{border-color:#31594e;background:#edf1e7}.learn-button.primary:hover{background:#25483e}.learn-button:disabled{opacity:.42;cursor:default}.player-count{margin-left:auto;color:#70685e;font:.75rem ui-monospace,monospace}.http-details{border-top:1px solid #e0dbce;margin:0 28px;padding:16px 0;font-size:.8rem}.learning-shell summary{cursor:pointer;font-weight:650}.learning-shell pre{font:.8rem/1.8 ui-monospace,SFMono-Regular,Consolas,monospace;white-space:pre-wrap;overflow-wrap:anywhere;margin:12px 0 0;padding:18px;background:#eeede4;border-radius:8px;color:#3b5146}.lesson-note{color:#70685e;font-size:.8rem;margin:14px 0 0}.concept-strip{display:grid;grid-template-columns:repeat(3,1fr);gap:26px;padding:26px 0;border-bottom:1px solid var(--line)}.concept-strip h3{margin:0 0 8px;font-size:.9rem}.concept-strip p{margin:0;font-size:.8rem;color:#70685e}.login-walkthrough{padding-left:24px}.login-walkthrough li{padding:6px 0}.login-walkthrough h3{font-size:.9rem;margin:0 0 5px}.login-walkthrough p{margin:0;font-size:.85rem}.comparison-scroll{border:1px solid #d7d0bf;border-radius:14px;overflow:hidden;background:#fffaf2}.comparison-table{width:100%;table-layout:fixed;border-collapse:collapse;text-align:left;font-size:.85rem;line-height:1.8}.comparison-table caption{text-align:left;padding:14px 20px;color:#6e7561;font-size:.75rem;border-bottom:1px solid #d7d0bf}.comparison-table th,.comparison-table td{padding:15px 20px;border-bottom:1px solid #e4dece;vertical-align:top;overflow-wrap:anywhere}.comparison-table thead{background:#e9eee1;color:#3f644c}.comparison-table th:first-child{width:20%}.comparison-table tbody th{font-weight:650;color:#5e6853}.comparison-table tbody td{color:#655d54}.comparison-table tr:last-child th,.comparison-table tr:last-child td{border-bottom:0}.cookie-inspector{display:grid;grid-template-columns:1.05fr 1fr;gap:36px;padding:28px;border-radius:16px;border:1px solid #d7d0bf;background:#fffaf2}.header-caption{font:.7rem ui-monospace,monospace;color:#716654;margin:0 0 12px}.cookie-code{font:.85rem/2.7 ui-monospace,SFMono-Regular,Consolas,monospace}.cookie-code button{display:inline;color:#6c4e2c;font:inherit;text-align:left;background:#f3ead8;border:1px solid transparent;border-radius:5px;padding:3px 7px;cursor:pointer;margin:2px 0}.cookie-code button[aria-pressed=true]{background:#31594e;border-color:#31594e;color:#fff}.cookie-code button:hover{border-color:#a8b49e}.parameter-explanation{padding:0 0 0 28px;border-left:1px solid var(--line);min-height:260px}.parameter-explanation h3{color:#31594e;margin:0 0 12px;font-size:1.2rem}.parameter-explanation p{font-size:.88rem;margin:0 0 12px}.parameter-example{background:#eef0e5;padding:12px;border-radius:6px;font-size:.8rem}.parameter-pitfall{color:#8e482e;font-size:.8rem!important;margin-top:12px!important}.advanced-note{border-bottom:1px solid var(--line);padding:18px 0;font-size:.85rem}.advanced-note p{color:#655d54}.advanced-note code,.concept-strip code{overflow-wrap:anywhere}.advanced-table{width:100%;border-collapse:collapse;margin-top:14px;font-size:.82rem;text-align:left}.advanced-table th,.advanced-table td{border-bottom:1px solid var(--line);padding:12px 10px 12px 0;vertical-align:top}.lab-layout{display:grid;grid-template-columns:1fr 1fr;gap:24px;align-items:start}.lab-settings,.lab-results{background:#fffaf2;border:1px solid #d7d0bf;border-radius:14px;padding:24px;min-width:0}.lab-settings fieldset{border:0;padding:0;margin:0 0 20px;min-width:0}.lab-settings legend,.lab-results h3{font-size:.95rem;font-weight:750;margin:0 0 14px}.field-pair{display:grid;grid-template-columns:1fr 1fr;gap:12px}.lab-field{display:grid;gap:5px;margin-bottom:12px;font-size:.78rem}.lab-field select{min-width:0;width:100%;padding:9px 8px;border:1px solid #c8c6b6;border-radius:6px;background:#fff;font-size:.78rem;color:#3e4436;min-height:42px}.check-row{display:flex;flex-wrap:wrap;gap:16px;font-size:.8rem;margin:6px 0 16px}.check-row label{display:flex;gap:6px;align-items:center}.check-row input{width:17px;height:17px;accent-color:#31594e}.lab-presets{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:18px}.lab-presets button{font-size:.74rem;padding:5px 9px;min-height:34px}.result-line{border-bottom:1px solid #e4ddcf;padding:12px 0}.result-line:first-of-type{padding-top:0}.result-line strong{font-size:.85rem}.result-line p{margin:4px 0 0;color:#655d54;font-size:.8rem}.result-label{display:flex;align-items:center;gap:10px}.verdict{display:inline-block;font-size:.7rem;font-weight:750;background:#e3eddd;color:#31594e;padding:1px 7px;border-radius:4px}.verdict[data-ok=false]{background:#f5e5d9;color:#914a2c}.lab-url{font:.75rem/1.7 ui-monospace,monospace;overflow-wrap:anywhere;color:#52695f;margin:0 0 12px}.lab-headers h4{margin:18px 0 5px;font-size:.75rem;color:#70685e;font-weight:500}.lab-headers pre{margin-top:0;font-size:.73rem;padding:12px}.takeaway{display:grid;grid-template-columns:1fr 1fr;gap:36px;border-top:1px solid var(--line);padding-top:30px}.takeaway h2{font-size:1.5rem;font-family:var(--serif);margin-top:0}.takeaway p,.takeaway li{color:#655d54;font-size:.85rem}.takeaway ol{padding-left:20px}.learning-sources{font-size:.75rem;color:#70685e;border-top:1px solid var(--line);padding-top:20px;margin-top:32px}.learning-sources a{margin-right:16px;display:inline-block;text-underline-offset:3px}.learning-related{margin-top:30px;padding:22px 0 0;border-top:1px solid var(--line);display:flex;flex-wrap:wrap;gap:10px 26px;font-size:.8rem}.learning-related p{width:100%;margin:0;color:#70685e}.learning-related a{text-underline-offset:4px}.learning-shell [hidden]{display:none!important}.learning-shell :is(button,a,select,input):focus-visible{outline:3px solid #a84d2e;outline-offset:4px}@media(max-width:950px){.cookie-inspector{gap:20px;padding:22px}.lesson-feature-art{padding-left:6%}.session-drawing{right:6%;padding:15px;font-size:.72rem}.art-connection{left:42%}.cookie-drawing{width:110px;height:110px}}@media(max-width:700px){.learning-shell{width:calc(100% - 32px);padding-bottom:40px}.learning-hero,.hub-hero{padding:32px 0}.learning-lead{font-size:.95rem}.desktop-break,.lesson-number{display:none}.lesson-feature{grid-template-columns:1fr}.lesson-feature-copy{padding:28px}.lesson-feature-art{min-height:270px;padding-left:8%}.lesson-feature-art .cookie-drawing{width:100px;height:100px}.art-label{margin-left:30px}.art-connection{left:44%;top:45%;font-size:0}.art-connection span{font-size:1.4rem}.session-drawing{right:6%;width:126px;padding:12px;font-size:.7rem}.learning-footnote{flex-direction:column;gap:8px}.lesson-heading{gap:12px}.chapter-badge{display:none}.chapter-nav{gap:18px;margin-bottom:28px}.chapter-nav a{font-size:.8rem}.lesson-section{margin-bottom:44px}.step-list{grid-template-columns:repeat(3,1fr);padding:14px 16px 0}.step-list button{padding-bottom:8px;font-size:.75rem}.film-stage{margin:14px 10px}.film-topline{padding:10px 12px;font-size:.65rem}.film-topline>span:last-child{display:none}.film-start{top:49%;padding:12px 18px;font-size:.85rem}.film-timeline{padding:18px 18px 0;gap:8px}.film-timeline>span{display:none}.film-speed{margin-left:0}.step-explanation{margin:0 18px;padding:16px;grid-template-columns:25px 1fr;gap:8px}.step-explanation p{font-size:.8rem}.player-controls{padding:16px 18px}.player-controls .learn-button{padding-inline:11px}.player-count{margin-left:auto;text-align:right}.http-details{margin-inline:18px}.concept-strip{grid-template-columns:1fr;gap:18px}.comparison-table{font-size:.76rem}.comparison-table th,.comparison-table td{padding:12px 10px}.comparison-table caption{padding:12px}.cookie-inspector{grid-template-columns:1fr;gap:24px;padding:20px}.parameter-explanation{padding:20px 0 0;border-left:0;border-top:1px solid var(--line);min-height:0}.lab-layout,.takeaway{grid-template-columns:1fr;gap:18px}.lab-settings,.lab-results{padding:20px}.advanced-table th,.advanced-table td{font-size:.75rem}}@media(prefers-reduced-motion:reduce){.learning-shell *,.learning-shell *:before,.learning-shell *:after{animation:none!important;transition:none!important}.learning-shell{scroll-behavior:auto}}