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strong{font-weight:var(--weight-bold)}.practice{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(100%,17rem),1fr));align-items:start;gap:var(--space-3);max-width:none;margin:0;padding:0;list-style:none;counter-reset:practice}.practice__item{display:grid;grid-template-columns:var(--rail) minmax(0,1fr);gap:var(--space-2) var(--space-3);padding:var(--space-4);background:var(--color-surface);border:var(--border) solid var(--color-line);border-radius:var(--radius-md)}.practice__number{display:grid;place-items:center;width:var(--rail);height:var(--rail);border-radius:var(--radius-sm);background:var(--color-surface-2);color:var(--color-ink-muted);font-size:var(--text-sm);font-weight:var(--weight-bold);font-variant-numeric:tabular-nums}.practice__body{min-width:0}.practice__question{display:flex;align-items:center;min-height:var(--rail);margin:0;overflow-x:auto}.practice__question .katex{font-size:var(--math-scale-step)}.answer-reveal{margin-top:var(--space-2)}.answer-reveal summary{display:inline-flex;align-items:center;gap:var(--space-2);min-height:var(--target);padding-inline:var(--space-3) var(--space-4);border:var(--border) solid var(--color-line-strong);border-radius:var(--radius-md);color:var(--color-ink);font-size:var(--text-sm);font-weight:var(--weight-medium);cursor:pointer;list-style:none;user-select:none;transition:background-color var(--duration-fast) var(--ease-out),border-color var(--duration-fast) var(--ease-out)}.answer-reveal summary::-webkit-details-marker{display:none}.answer-reveal summary:before{content:"";width:.45em;height:.45em;margin-inline:var(--space-1);border:solid currentColor;border-width:0 var(--border-thick) var(--border-thick) 0;transform:rotate(-45deg);transition:transform var(--duration-base) var(--ease-out)}.answer-reveal summary:hover{background:var(--color-surface-2);border-color:var(--color-ink-muted)}.answer-reveal[open] summary{border-color:var(--color-primary);color:var(--color-primary-strong)}.answer-reveal[open] summary:before{margin-top:-.3em;transform:rotate(45deg)}.practice__answer{margin:var(--space-2) 0 0;padding:var(--space-2) var(--space-3);border-radius:var(--radius-sm);background:var(--color-primary-soft);overflow-x:auto}.practice-lead{color:var(--color-ink-muted)}.jump-nav{position:sticky;top:0;z-index:5;margin:var(--space-5) calc(-1 * var(--gutter)) 0;background:var(--color-bg);border-bottom:var(--border) solid var(--color-line)}.jump-nav ul{display:flex;gap:var(--space-2);max-width:none;margin:0;padding:0;padding:var(--space-2) var(--gutter);list-style:none;overflow-x:auto;scrollbar-width:none}.jump-nav a{display:inline-flex;align-items:center;gap:var(--space-2);min-height:var(--target);padding-inline:var(--space-4);border:var(--border) solid var(--color-line);border-radius:var(--radius-full);background:var(--color-surface);color:var(--color-ink);font-size:var(--text-sm);font-weight:var(--weight-medium);text-decoration:none;white-space:nowrap}.jump-nav a:hover{border-color:var(--color-line-strong);color:var(--color-primary)}.example-layout{display:grid;gap:var(--space-7)}.example{min-width:0}.example>.section:first-of-type{margin-top:var(--space-6)}.example__intro{margin-top:var(--space-5)}.aside{display:grid;gap:var(--space-4);align-content:start}.panel{padding:var(--space-5);border:var(--border) solid var(--color-line);border-radius:var(--radius-lg);background:var(--color-surface)}.panel h2{margin-bottom:var(--space-3);font-size:var(--text-md);letter-spacing:0}.panel .button{width:100%}.panel .link-list a{font-size:var(--text-sm)}.toc{margin:0;padding:0;list-style:none;border-left:var(--border-thick) solid var(--color-line)}.toc a{display:flex;align-items:center;min-height:var(--target);margin-left:calc(-1 * var(--border-thick));padding-left:var(--space-4);border-left:var(--border-thick) solid transparent;color:var(--color-ink-muted);font-size:var(--text-sm);text-decoration:none}.toc a:hover{border-left-color:var(--color-primary);color:var(--color-ink)}.pager{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,15rem),1fr));gap:var(--space-3);max-width:none;margin:var(--space-7) 0 0;padding:0;list-style:none}.pager a{display:flex;flex-direction:column;gap:var(--space-1);height:100%;min-height:var(--target);padding:var(--space-4) var(--space-5);border:var(--border) solid var(--color-line);border-radius:var(--radius-md);background:var(--color-surface);color:var(--color-ink);font-weight:var(--weight-medium);text-decoration:none;transition:border-color var(--duration-fast) var(--ease-out)}.pager a:hover{border-color:var(--color-primary);color:var(--color-primary)}.pager .label{margin:0}.pager__next{text-align:right}@media(min-width:64rem){.example-layout{grid-template-columns:minmax(0,1fr) 17.5rem;gap:var(--space-8)}.aside{position:sticky;top:var(--space-5);margin-top:var(--space-1)}.aside__toc{order:-1}}@media(max-width:63.99rem){.aside__toc{display:none}}.cta-band{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:var(--space-4) var(--space-6);margin-top:var(--space-7);padding:var(--space-5) var(--space-6);border:var(--border) solid var(--color-line);border-radius:var(--radius-lg)}.cta-band h2{margin:0 0 var(--space-1);font-size:var(--text-xl)}.cta-band p{margin:0;color:var(--color-ink-muted)}.hero{display:grid;gap:var(--space-6);align-items:center;padding-top:var(--space-6)}.hero h1{font-size:clamp(2rem,1.3rem + 2.6vw,3.25rem);max-width:16ch}.hero .lede{max-width:42ch;margin-bottom:var(--space-5)}.trust{display:flex;flex-wrap:wrap;gap:var(--space-2) var(--space-5);margin:var(--space-5) 0 0;padding:0;list-style:none;color:var(--color-ink-muted);font-size:var(--text-sm)}.trust li{display:inline-flex;align-items:center;gap:var(--space-2)}.trust li:before{content:"";width:.4em;height:.75em;margin-top:-.2em;border:solid var(--color-primary);border-width:0 var(--border-thick) var(--border-thick) 0;transform:rotate(45deg)}.sample{padding:var(--space-5);border:var(--border) solid var(--color-line);border-radius:var(--radius-lg);box-shadow:var(--shadow-2)}.sample__head{display:flex;justify-content:space-between;align-items:baseline;gap:var(--space-3)}.sample .problem-card{margin:var(--space-2) 0 var(--space-5);box-shadow:none}.sample .problem-card__problem{padding:var(--space-2) var(--space-4)}.sample .problem-card__problem .math-block{padding-block:var(--space-2)}.sample .problem-card__answer{padding:var(--space-2) var(--space-4)}.sample__foot{margin:var(--space-4) 0 0;padding-top:var(--space-3);border-top:var(--border) solid var(--color-line)}.sample__foot a{display:inline-flex;align-items:center;min-height:var(--target);font-weight:var(--weight-medium)}.how{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,13rem),1fr));gap:var(--space-4);max-width:none;margin:0;padding:0;list-style:none;counter-reset:how}.how li{counter-increment:how;padding-top:var(--space-4);border-top:var(--border-thick) solid var(--color-ink)}.how li:before{content:counter(how,decimal-leading-zero);display:block;margin-bottom:var(--space-2);color:var(--color-primary);font-family:var(--font-mono);font-size:var(--text-sm);font-weight:var(--weight-bold)}.how h3{margin-bottom:var(--space-1);font-size:var(--text-md);letter-spacing:0}.how p{margin:0;color:var(--color-ink-muted);font-size:var(--text-sm)}.how+.note{margin-top:var(--space-6)}@media(min-width:56rem){.hero{grid-template-columns:minmax(0,1.1fr) minmax(0,1fr);gap:var(--space-8);padding-top:var(--space-7)}}.ad-slot{min-height:var(--ad-slot-min-h);margin-block:var(--space-6)}.site-footer{border-top:var(--border) solid var(--color-line);background:var(--color-surface-2);color:var(--color-ink);font-size:var(--text-sm)}.site-footer__inner{display:grid;gap:var(--space-5) var(--space-7);padding-block:var(--space-7) var(--space-5)}.site-footer__brand p{margin:var(--space-2) 0 0;max-width:30ch;color:var(--color-ink-muted)}.site-footer__nav{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:var(--space-5)}.site-footer h2{margin:0 0 var(--space-1);font-size:var(--text-xs);font-weight:var(--weight-bold);letter-spacing:var(--tracking-label);text-transform:uppercase;color:var(--color-ink-muted)}.site-footer ul{margin:0;padding:0;list-style:none}.site-footer a{display:inline-flex;align-items:center;min-height:var(--target);color:var(--color-ink);text-decoration:none}.site-footer a:hover{color:var(--color-primary);text-decoration:underline}.site-footer__base{display:flex;flex-wrap:wrap;justify-content:space-between;gap:var(--space-2) var(--space-5);padding-block:var(--space-4) var(--space-6);border-top:var(--border) solid var(--color-line);color:var(--color-ink-muted)}.site-footer__base p{margin:0}@media(min-width:48rem){.site-footer__inner{grid-template-columns:minmax(0,1fr) minmax(0,1.2fr)}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{animation-duration:var(--duration-instant)!important;animation-iteration-count:1!important;transition-duration:var(--duration-instant)!important}}@media print{.site-header,.site-footer,.crumbs,.aside,.pager,.jump-nav,.button-row{display:none}body{background:none}.card,.problem-card,.sample{box-shadow:none}}