.resource-section{padding:56px 0 62px;border-top:1px solid var(--line)}.resource-heading{max-width:760px;margin-bottom:30px}.resource-heading .eyebrow{margin-bottom:17px}.resource-heading h2,.guide-contact h2{font:38px/1.2 Georgia,serif;letter-spacing:-.8px;margin:0 0 17px;text-wrap:balance}.resource-heading>p:last-child{font-size:14px;line-height:1.85;color:var(--muted);margin:0}.resource-cards{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}.resource-card{border-top:1px solid #bdc8b5;padding:22px 0 0;min-width:0;display:flex;flex-direction:column;align-items:flex-start}.resource-index{font-size:10px;letter-spacing:1px;color:#596b50}.resource-card h3{font:26px/1.22 Georgia,serif;letter-spacing:-.3px;margin:16px 0 13px;text-wrap:balance}.resource-card h3 a{text-decoration:none}.resource-card h3 a:hover{text-decoration:underline;text-underline-offset:5px}.resource-card p{font-size:13px;line-height:1.8;color:var(--muted);margin:0 0 18px;flex:1}.resource-read{font-size:11px;line-height:1.6;text-decoration:none;border-bottom:1px solid #bdc8b5;padding-bottom:4px}.guide-breadcrumb{display:flex;gap:12px;flex-wrap:wrap;font-size:10px;line-height:1.7;color:var(--muted);padding-top:45px}.guide-breadcrumb a{text-decoration:none}.guide-hero{max-width:940px;padding:43px 0 63px}.guide-hero .eyebrow{margin-bottom:23px;color:#596b50}.guide-hero h1{font:clamp(40px,4.5vw,64px)/1.13 Georgia,serif;letter-spacing:-1.8px;text-wrap:balance;margin:0 0 27px;max-width:920px}.guide-lead{font-size:18px;line-height:1.85;max-width:780px;color:#536357;margin:0}.guide-layout{display:grid;grid-template-columns:210px minmax(0,1fr);gap:64px;border-top:1px solid var(--line)}.guide-layout>aside{min-width:0}.guide-contents{position:sticky;top:26px;padding:35px 0 25px}.guide-contents>p{font-size:10px;font-weight:600;letter-spacing:.5px;margin:0 0 18px}.guide-contents ol{padding:0;list-style:none;display:grid;gap:16px;margin:0}.guide-contents a{font-size:12px;line-height:1.7;color:#576950;text-decoration:none;display:block}.guide-contents a:hover{text-decoration:underline;text-underline-offset:4px}.guide-body{min-width:0}.guide-section{padding:35px 0 40px;scroll-margin-top:26px}.guide-section+.guide-section{border-top:1px solid var(--line)}.section-number{font-size:10px;color:#596b50;letter-spacing:1px}.guide-section h2{font:34px/1.25 Georgia,serif;letter-spacing:-.6px;text-wrap:balance;margin:16px 0 24px}.guide-section p{font-size:15px;line-height:1.95;color:#566157;margin:0 0 17px;max-width:800px}.guide-items{list-style:none;padding:0;margin:0;display:grid;gap:25px}.guide-items h3{font-size:15px;font-weight:600;line-height:1.6;margin:0 0 7px}.guide-items p{margin:0;font-size:14px}.guide-items.ordered{counter-reset:guide-step;gap:26px}.guide-items.ordered li{position:relative;padding-left:49px;counter-increment:guide-step}.guide-items.ordered li:before{content:counter(guide-step,decimal-leading-zero);position:absolute;left:0;top:1px;font:20px/1.3 Georgia,serif;color:#657d56}.comparison-wrap{min-width:0}.comparison-table{width:100%;border-collapse:collapse;table-layout:fixed;font-size:13px;line-height:1.8}.comparison-table th,.comparison-table td{text-align:left;vertical-align:top;padding:17px 15px;border-bottom:1px solid var(--line);overflow-wrap:anywhere}.comparison-table thead th{font:24px/1.3 Georgia,serif;padding-top:15px;padding-bottom:20px}.comparison-table thead th:first-child{width:26%;font:11px/1.7 Segoe UI,Arial,sans-serif;color:var(--muted)}.comparison-table tbody th{font-weight:500;font-size:12px}.comparison-table td:nth-child(2),.comparison-table thead th:nth-child(2){background:#eaf0e1}.comparison-table td{color:#526050}.guide-figure{margin:29px 0 0;border:1px solid var(--line);border-radius:8px;overflow:hidden;background:#fcfaf3}.guide-figure img{display:block;width:100%;height:auto}.guide-figure figcaption{font-size:10px;line-height:1.8;color:var(--muted);padding:12px 15px;border-top:1px solid var(--line)}.guide-code{font:12px/2 Consolas,monospace;background:#edf1e6;border:1px solid #d2dbc7;border-radius:7px;padding:22px;white-space:pre;overflow:auto;max-width:100%;margin:24px 0 0}.guide-source{font-size:11px;line-height:1.8;margin:0 0 40px;color:var(--muted)}.guide-contact{display:grid;grid-template-columns:1.3fr 1fr;gap:50px;border-top:1px solid var(--line);padding:47px 0 53px}.guide-contact .eyebrow{margin-bottom:18px}.guide-contact p:last-child{font-size:14px;line-height:1.85;color:var(--muted);max-width:670px;margin:0}.guide-contact-links{display:flex;align-items:center;justify-content:flex-end;flex-wrap:wrap;gap:22px}.guide-contact .primary{display:inline-block;background:#355342;color:#fffdf5;text-decoration:none;padding:13px 19px;border-radius:5px;font-size:12px;line-height:1.6}.guide-secondary{font-size:12px;line-height:1.7}.guide-contact .primary:hover{background:#273e32}.guide-page .resource-cards{grid-template-columns:repeat(2,minmax(0,1fr))}.guide-page .site-footer a{line-height:1.8}html[lang=zh-Hant] .guide-hero h1{letter-spacing:0;line-height:1.4}html[lang=zh-Hant] .guide-section p{line-height:2}
@media(max-width:1050px){.guide-layout{grid-template-columns:170px minmax(0,1fr);gap:35px}.guide-section h2{font-size:30px}.comparison-table th,.comparison-table td{padding:13px 10px}.guide-contact{gap:28px}.guide-contact-links{justify-content:flex-start}.resource-card h3{font-size:24px}}
@media(max-width:740px){.guide-page .site-header{flex-wrap:wrap}.resource-section{padding:34px 0 39px}.resource-heading h2,.guide-contact h2{font-size:30px}.resource-heading>p:last-child{font-size:13px}.resource-cards,.guide-page .resource-cards{grid-template-columns:1fr;gap:27px}.resource-card h3{font-size:27px}.guide-breadcrumb{padding-top:30px}.guide-hero{padding:29px 0 36px}.guide-hero h1{font-size:43px;letter-spacing:-1px;overflow-wrap:anywhere}.guide-lead{font-size:16px;line-height:1.85}.guide-layout{grid-template-columns:1fr;gap:0}.guide-contents{position:static;padding:25px 0;border-bottom:1px solid var(--line)}.guide-contents ol{gap:10px}.guide-contents a{font-size:12px}.guide-section{padding:30px 0}.guide-section h2{font-size:29px}.guide-section p{font-size:14px}.guide-items h3{font-size:14px}.guide-items.ordered li{padding-left:39px}.comparison-table{font-size:11px;line-height:1.75}.comparison-table thead th{font-size:21px}.comparison-table thead th:first-child{font-size:10px;width:27%}.comparison-table th,.comparison-table td{padding:12px 7px}.comparison-table tbody th{font-size:10px}.guide-code{font-size:10px;padding:16px}.guide-contact{grid-template-columns:1fr;gap:25px;padding:33px 0 36px}.guide-contact-links{gap:19px}.guide-contact .primary{font-size:11px}.guide-figure figcaption{font-size:9px}}

/* Original diagrams and progressively disclosed practice answers. */
.lesson-figure{margin:27px 0 0;border:1px solid var(--line);border-radius:8px;background:#fcfaf3;overflow:hidden}.lesson-figure svg{display:block;width:100%;height:auto}.lesson-grid{stroke:#e0e5d9;stroke-width:1;fill:none}.lesson-path{stroke:#355542;stroke-width:3;fill:none;stroke-linejoin:round;stroke-linecap:round}.lesson-point{fill:#355542}.lesson-label{font:22px "Segoe UI",sans-serif;fill:#294638}.lesson-figure figcaption{font-size:12px;line-height:1.8;color:var(--muted);padding:14px 18px;border-top:1px solid var(--line)}.lesson-exercise{background:#edf1e6;border:1px solid #cdd8c0;padding:23px;border-radius:7px}.lesson-exercise summary{font-size:14px;line-height:1.7;cursor:pointer;text-decoration:underline;text-underline-offset:4px}.lesson-exercise details[open] summary{margin-bottom:17px}.lesson-exercise details p:last-child{margin-bottom:0}.lesson-sources ul{padding-left:20px}.lesson-sources li{font-size:13px;line-height:1.9;margin-bottom:10px}.lesson-sources a{text-underline-offset:4px}.lesson-sources h2{font-size:26px}@media(max-width:740px){.lesson-figure figcaption{font-size:11px;padding:12px}.lesson-exercise{padding:18px}.lesson-exercise summary{font-size:13px}}

.lesson-navigation{display:flex;gap:14px 25px;flex-wrap:wrap;padding:0 0 28px}.lesson-navigation a{font-size:12px;line-height:1.7;text-underline-offset:4px}.lesson-navigation a[aria-current]{font-weight:600;text-decoration:none}.learning-page .comparison-table thead th:first-child{width:52%;font:16px/1.5 "Segoe UI",sans-serif}.learning-page .comparison-table thead th{font:16px/1.5 "Segoe UI",sans-serif}.learning-page .comparison-table tbody th{font-size:13px}@media(max-width:740px){.lesson-navigation{flex-direction:column;gap:13px}.learning-page .comparison-table tbody th,.learning-page .comparison-table td{font-size:12px}.learning-page .comparison-table thead th,.learning-page .comparison-table thead th:first-child{font-size:13px}}
.practical-label{font:17px "Segoe UI",sans-serif;fill:#294638}.practical-bracket{stroke:#657d56;stroke-width:1.5;fill:none}