.fcard{width:var(--w,150px);height:var(--h,200px);border-radius:calc(var(--w,150px) * .12);background:var(--card);box-shadow:var(--sh);font-size:calc(var(--w,150px) / 150 * 10px);color:var(--ink);flex-direction:column;flex:none;display:flex;position:relative;overflow:hidden;container-type:inline-size}.fcard .st{flex:none;align-items:center;gap:.5em;height:max(26px,2.8em);padding:0 max(6px,.6em) 0 max(10px,1.15em);font-size:1.05em;font-weight:800;display:flex}.fcard .st .sl{text-overflow:ellipsis;white-space:nowrap;flex:1;min-width:0;overflow:hidden}.fcard .st i{background:var(--dark);color:#fff;border-radius:999px;flex:none;padding:.3em .7em;font-size:.82em;font-style:normal;font-weight:700}.fcard .bd>.tex+.tex{margin-top:-.5em}.fcard .bd{text-align:center;flex-direction:column;flex:1;justify-content:center;align-items:center;gap:.9em;min-width:0;min-height:0;padding:max(12px,1.5em) max(12px,1.4em);display:flex}.fcard .tex{white-space:nowrap;font-size:2.3em;line-height:1.2}.fcard .code{text-align:left;white-space:pre;border-radius:.9em;width:100%;padding:.9em 1em;font-size:.95em;overflow:hidden}.fcard small{color:var(--dim);text-wrap:balance;font-size:1em;font-weight:600;line-height:1.4}.tex .stk{vertical-align:middle;flex-direction:column;align-items:center;margin:0 .1em;font-style:normal;line-height:1;display:inline-flex}.tex .stk small{font-size:.58em;line-height:1.05}.tex .stk .op{vertical-align:0;margin:0;font-size:1.4em;line-height:1}.tex .lims{vertical-align:middle;flex-direction:column;justify-content:space-between;height:2.3em;margin:0 .12em 0 -.02em;font-size:.6em;font-style:normal;line-height:1;display:inline-flex}.clay .tex .fr{vertical-align:middle;position:relative;top:-.08em}:root{--read:680px;--rail:280px;--prose:#5d5852;--serif:"STIX Two Text", "Times New Roman", Georgia, serif;--paper:#fbfaf7}body{overflow-x:clip}.g-nav .wrap,.g-main,.g-foot{max-width:calc(var(--read) + var(--rail) + 64px + 2 * var(--gut))}.g-nav .wrap{height:76px;padding:0 var(--gut);align-items:center;gap:24px;width:100%;margin:0 auto;display:flex}.g-nav .meta{color:var(--dim);margin:0 0 0 auto;font-size:12.5px;font-weight:600;display:none}.g-nav .meta b{color:var(--ink);font-weight:700}.g-nav .btn{height:38px;margin-left:auto;padding:0 16px;font-size:13px}@media (width>=720px){.g-nav .meta{display:block}.g-nav .btn{margin-left:0}}.g-main{padding:28px var(--gut) 72px;grid-template-columns:minmax(0,1fr);gap:56px 64px;width:100%;margin:0 auto;display:grid}@media (width>=1040px){.g-main{grid-template-columns:minmax(0, var(--read)) var(--rail);padding-top:48px}}.g-art{flex-direction:column;gap:44px;min-width:0;display:flex}.g-head{flex-direction:column;align-items:flex-start;gap:18px;display:flex}.g-crumb{color:var(--dim);flex-wrap:wrap;align-items:center;gap:6px;margin:0;font-size:12.5px;font-weight:600;display:flex}.g-crumb a{color:var(--ink);padding:4px 0;font-weight:700}.g-crumb .ms{font-size:16px}.g-art h1{letter-spacing:-.045em;text-wrap:balance;margin:0;font-size:clamp(38px,8.6vw,60px);font-weight:800;line-height:.98}.g-art h1 em,.g-art h2 em{font-family:var(--serif);letter-spacing:-.02em;color:var(--accent);font-style:italic;font-weight:500}.g-lead{color:var(--prose);max-width:60ch;margin:0;font-size:clamp(17px,2.3vw,19px);font-weight:500;line-height:1.55}.g-by{color:var(--dim);margin:0;font-size:12.5px;font-weight:600}.g-by b{color:var(--ink);font-weight:700}.g-brief{background:var(--card);box-shadow:var(--sh);border-radius:22px;flex-direction:column;gap:10px;padding:20px 22px 22px;display:flex}.g-brief h2{letter-spacing:.09em;text-transform:uppercase;color:var(--dim);margin:0;font-size:12px;font-weight:800}.g-brief p{color:var(--ink);margin:0;font-size:16.5px;font-weight:600;line-height:1.55}.g-sec{flex-direction:column;gap:14px;display:flex}.g-sec>h2{letter-spacing:-.03em;text-wrap:balance;margin:0 0 2px;font-size:clamp(24px,4.4vw,30px);font-weight:800;line-height:1.1}.g-sec p,.g-sec li{color:var(--prose);font-size:16px;line-height:1.65}.g-sec p{max-width:64ch;margin:0}.g-sec b,.g-sec strong{color:var(--ink);font-weight:700}.g-sec a.in{color:var(--ink);text-decoration:underline;text-decoration-color:var(--accent);text-underline-offset:3px;font-weight:700;text-decoration-thickness:2px}.g-list{flex-direction:column;gap:8px;max-width:64ch;margin:0;padding:0;list-style:none;display:flex}.g-list li{grid-template-columns:22px 1fr;gap:10px;display:grid}.g-list li .ms{color:var(--okink);margin-top:3px;font-size:19px}.g-steps{counter-reset:step;flex-direction:column;gap:4px;margin:6px 0 0;padding:0;list-style:none;display:flex}.g-steps li{counter-increment:step;border-top:1px solid var(--line);grid-template-columns:40px 1fr;gap:14px;padding:12px 0;display:grid}.g-steps li:last-child{border-bottom:1px solid var(--line)}.g-steps li:before{content:counter(step);font-family:var(--serif);color:var(--accent);text-align:center;padding-top:2px;font-size:30px;font-style:italic;line-height:1}.g-steps b{letter-spacing:-.01em;font-size:16.5px;display:block}.g-steps span{margin-top:2px;display:block}.g-fig{flex-direction:column;gap:14px;margin:10px 0 0;display:flex}.g-desk{box-shadow:inset 0 0 0 1px #3c30240f, var(--sh);background-color:#cfe0c9;background-image:linear-gradient(#ffffff59 1px,#0000 1px),linear-gradient(90deg,#ffffff59 1px,#0000 1px);background-position:0 0;background-repeat:repeat;background-size:28px 28px;background-attachment:scroll;background-origin:padding-box;background-clip:border-box;border-radius:26px;flex-wrap:wrap;justify-content:center;align-items:center;gap:26px 30px;padding:28px 22px 30px;display:flex;overflow:hidden}.g-sheet{background:var(--paper);width:250px;color:var(--ink);border-radius:6px;flex-direction:column;flex:none;gap:9px;padding:18px 18px 20px;display:flex;transform:rotate(-2.2deg);box-shadow:0 1px 1px #3c302414,0 14px 30px #3c302429}.g-sheet .ph{letter-spacing:.08em;text-transform:uppercase;color:var(--dim);justify-content:space-between;gap:8px;font-size:8.5px;font-weight:700;display:flex}.g-sheet h6{letter-spacing:-.01em;margin:0;font-size:13px;font-weight:800}.g-sheet h6 span{color:var(--accent);margin-right:6px}.g-sheet p{color:var(--prose);margin:0;font-size:10.5px;line-height:1.45}.g-sheet .pf{text-align:center;padding:2px 0}.g-sheet .pf .tex{white-space:nowrap;font-size:12.5px}.g-sheet .hl{background:linear-gradient(#0000 12%,#f6dd8f 12% 88%,#0000 88%);padding:0 2px}.g-cards{flex:none;gap:14px;display:flex}.g-cards .fcard{--w:150px;--h:196px}@media (width<=480px){.g-cards{gap:10px}.g-cards .fcard{--w:136px;--h:180px}}.g-cards .fcard:first-child{transform:rotate(3deg)}.g-cards .fcard:nth-child(2){transform:rotate(-4deg)translateY(10px)}.g-cards .fcard .tex{font-size:1.75em}.g-fig figcaption{color:var(--dim);align-items:baseline;gap:12px;font-size:13px;font-weight:600;display:flex}.g-fig figcaption b{font-family:var(--serif);color:var(--ink);flex:none;font-size:15px;font-style:italic;font-weight:500}.g-tablewrap{margin:6px 0 0;overflow-x:auto}.g-table{border-collapse:collapse;width:100%;font-size:15px;line-height:1.45}.g-table th,.g-table td{text-align:left;vertical-align:top;border-bottom:1px solid var(--line);color:var(--prose);padding:12px 14px 12px 0}.g-table thead th{letter-spacing:.09em;text-transform:uppercase;color:var(--dim);font-size:12px;font-weight:800}.g-table tbody th{color:var(--ink);width:28%;font-weight:700}@media (width<=480px){.g-table{font-size:14px}.g-table th,.g-table td{padding-right:10px}}.g-note{font-family:var(--serif);color:#4a3d1c;background:linear-gradient(170deg,#f8e4a6,#f1d27f);border-radius:3px 3px 14px;align-self:flex-start;max-width:300px;margin:8px 0 0 6px;padding:16px 20px 18px;font-size:19px;font-style:italic;line-height:1.3;transform:rotate(-1.6deg);box-shadow:0 10px 22px #3c302429}.g-join{background:var(--card);box-shadow:var(--sh);border-radius:26px;flex-direction:column;gap:16px;padding:26px 24px 28px;display:flex}.g-join h2{letter-spacing:-.03em;margin:0;font-size:clamp(24px,4.4vw,30px);font-weight:800;line-height:1.1}.g-join p{color:var(--prose);max-width:56ch;margin:0;font-size:16px;line-height:1.6}.g-join p b{color:var(--ink)}.g-faq{flex-direction:column;display:flex}.g-faq details{border-top:1px solid var(--line)}.g-faq details:last-child{border-bottom:1px solid var(--line)}.g-faq summary{cursor:pointer;letter-spacing:-.01em;color:var(--ink);justify-content:space-between;align-items:center;gap:16px;padding:15px 0;font-size:16.5px;font-weight:700;list-style:none;display:flex}.g-faq summary::-webkit-details-marker{display:none}.g-faq summary .ms{color:var(--dim);transition:transform .2s var(--ease-out);flex:none}.g-faq details[open] summary .ms{transform:rotate(45deg)}.g-faq details p{padding:0 0 16px}.g-more{grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:12px;margin:4px 0 0;padding:0;list-style:none;display:grid}.g-more a{background:var(--card);height:100%;min-height:64px;box-shadow:var(--sh);color:var(--ink);border-radius:18px;justify-content:space-between;align-items:center;gap:12px;padding:14px 16px;font-size:14.5px;font-weight:700;line-height:1.3;display:flex}.g-more a .ms{color:var(--accent);flex:none}.g-rail{min-width:0}.g-rail .in{flex-direction:column;gap:14px;display:flex;position:sticky;top:28px}.g-peb{background:var(--card);box-shadow:var(--sh);border-radius:26px;flex-direction:column;align-items:flex-start;gap:12px;padding:22px 22px 24px;display:flex}.g-peb .pb{font-size:62px}.g-peb b{letter-spacing:-.02em;font-size:19px;font-weight:800;line-height:1.2}.g-peb p{color:var(--prose);margin:0;font-size:14px;line-height:1.55}.g-peb .btn{margin-top:4px}.g-toc{flex-direction:column;margin:0;padding:4px 6px;list-style:none;display:flex}.g-toc li a{color:var(--dim);padding:7px 0;font-size:13.5px;font-weight:600;display:block}.g-toc li a:hover{color:var(--ink)}.g-toc .t{letter-spacing:.09em;text-transform:uppercase;color:var(--dim);padding:6px 0 4px;font-size:12px;font-weight:800}@media (width<=1039px){.g-toc{display:none}}.g-foot{padding:0 var(--gut) 44px;justify-content:center;margin:0 auto;display:flex}.g-foot .links{background:var(--card);box-shadow:var(--sh);color:var(--dim);border-radius:22px;flex-wrap:wrap;justify-content:center;align-items:center;gap:4px;margin:0;padding:3px 6px 3px 14px;font-size:12.5px;font-weight:600;display:inline-flex}.g-foot .links a{color:var(--ink);border-radius:999px;padding:6px 8px;font-weight:700}.g-foot .cp{margin-right:6px}.g-main.gi{grid-template-columns:minmax(0,1fr)}.gi .g-art{gap:52px}.gi-group{gap:18px}.gi-group>h2{flex-wrap:wrap;align-items:baseline;gap:4px 12px;display:flex}.gi-group>h2 small{letter-spacing:.01em;color:var(--dim);font-size:13px;font-weight:700}.gi-list{grid-template-columns:repeat(auto-fill,minmax(min(100%,300px),1fr));gap:16px;margin:0;padding:0;list-style:none;display:grid}.gi-list li{min-width:0;display:flex}.gi-card{--tint:var(--sage);background:var(--card);min-width:0;box-shadow:var(--sh);color:var(--ink);transition:transform .2s var(--ease-out);border-radius:22px;flex-direction:column;flex:1;display:flex;overflow:hidden}.gi-card:hover{transform:translateY(-3px)rotate(-.4deg)}.gi-card:focus-visible{outline:3px solid var(--ink);outline-offset:3px}.gi-card .st{background:var(--tint);letter-spacing:.01em;align-items:center;gap:8px;min-height:36px;padding:6px 16px;font-size:12.5px;font-weight:800;display:flex}.gi-card .st .ms{font-size:18px}.gi-card .bd{flex-direction:column;flex:1;gap:8px;padding:16px 18px;display:flex}.gi-card b{letter-spacing:-.02em;text-wrap:balance;font-size:18px;font-weight:800;line-height:1.22}.gi-card .sum{color:var(--prose);font-size:14.5px;line-height:1.55}.gi-card .ft{color:var(--dim);justify-content:space-between;align-items:center;gap:12px;margin-top:auto;padding-top:8px;font-size:12.5px;font-weight:600;display:flex}.gi-card .ft .ms{color:var(--accent)}.k-tools .gi-card{--tint:var(--sky)}.k-maths .gi-card{--tint:var(--lilac)}@media (prefers-reduced-motion:reduce){.gi-card{transition:none}.gi-card:hover{transform:none}}.g-sec code{background:var(--card2);color:var(--ink);overflow-wrap:anywhere;border-radius:6px;padding:1px 6px;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:.86em;font-weight:600}.g-src{background:var(--paper);width:250px;max-width:100%;color:var(--ink);border-radius:6px;flex-direction:column;flex:none;gap:8px;padding:18px 18px 20px;display:flex;transform:rotate(-2deg);box-shadow:0 1px 1px #3c302414,0 14px 30px #3c302429}.g-src .ph{letter-spacing:.08em;text-transform:uppercase;color:var(--dim);justify-content:space-between;gap:8px;font-size:8.5px;font-weight:700;display:flex}.g-src .lbl{margin-top:4px;font-size:10.5px;font-weight:800}.g-src .code{white-space:pre-wrap;overflow-wrap:anywhere;border-radius:9px;padding:8px 10px;font-size:11px;line-height:1.55}.g-page .ph .pdf{background:var(--terra);color:var(--ink);letter-spacing:.06em;border-radius:4px;padding:1px 5px}.g-page .ln{background:var(--line);border-radius:3px;height:5px;display:block}.g-page .ln+.ln{margin-top:-4px}