:root{--bg: #f6f8fb;--surface: #ffffff;--text: #1f2933;--muted: #5f6b7a;--line: #e2e8f0;--brand: #2f5d8a;--brand-weak: #e8f0f8;--ok: #1f8a4c;--ok-weak: #e6f5ec;--ng: #c0392b;--ng-weak: #fbeaea;--ios: #0a84ff;--android: #2bb673;--surface-2: #fbfcfe;--code: #f1f4f8;--footer: #eef2f7;--cta-from: #f2f7fc;--cta-border: #cfe0f1;--mark: #fff1a8;--warn: #a86400;--warn-weak: #fff4e0;color-scheme: light}*{box-sizing: border-box}html{-webkit-text-size-adjust: 100%;font-size: 106.25%}@media (min-width: 768px){html{font-size: 112.5%}}body{margin: 0;background: var(--bg);color: var(--text);font-family: "Hiragino Sans","Noto Sans JP","Yu Gothic",sans-serif;line-height: 1.85;font-size: 1rem}a{color: var(--brand)}img{max-width: 100%;height: auto}.wrap{max-width: 1160px;margin: 0 auto;padding: 0 16px}.site-header .wrap{padding-top: 12px;padding-bottom: 12px}.site-title{color: #fff;text-decoration: none;font-weight: 700;font-size: 1.05rem}.layout{padding-top: 20px;padding-bottom: 32px}h1{font-size: 1.35rem;line-height: 1.5;margin: 8px 0 16px}h2{font-size: 1.15rem;margin: 32px 0 12px;padding-left: 10px;border-left: 4px solid var(--brand)}.hero{background: var(--surface);border: 1px solid var(--line);border-radius: 12px;padding: 20px}.hero h1{margin-top: 0}.breadcrumb{font-size: .85rem;color: var(--muted);margin-bottom: 8px}.set-list,.question-list{list-style: none;padding: 0;margin: 0;background: var(--surface);border: 1px solid var(--line);border-radius: 12px;overflow: hidden}.set-list li + li,.question-list li + li{border-top: 1px solid var(--line)}.set-list a,.question-list a{display: flex;gap: 12px;align-items: baseline;padding: 12px 16px;text-decoration: none;color: var(--text)}.set-list a:hover,.question-list a:hover{background: var(--brand-weak)}.set-title{flex: 1;font-weight: 600}.set-count{color: var(--muted);font-size: .9rem}.qnum{flex: none;width: 3.5em;font-weight: 700;color: var(--brand)}.qsum{color: var(--muted);font-size: .95rem;overflow: hidden;text-overflow: ellipsis;display: -webkit-box;-webkit-line-clamp: 2;-webkit-box-orient: vertical}.question{background: var(--surface);border: 1px solid var(--line);border-radius: 12px;padding: 20px}.question h1{font-size: 1rem;color: var(--muted);font-weight: 600;margin-top: 0}.q-body ul{padding-left: 1.2em}.q-body img,.explanation img{display: block;margin: 12px auto;border: 1px solid var(--line);border-radius: 6px;background: #fff}.q-body table,.explanation table{border-collapse: collapse;margin: 12px 0;display: block;overflow-x: auto}.q-body th,.q-body td,.explanation th,.explanation td{border: 1px solid var(--line);padding: 4px 8px}.q-body pre,.explanation pre{background: var(--code);padding: 12px;border-radius: 6px;overflow-x: auto}.choices{display: flex;flex-wrap: wrap;gap: 10px;margin: 20px 0 8px}.choice{min-width: 64px;padding: 10px 18px;font-size: 1.1rem;font-weight: 700;border: 2px solid var(--brand);border-radius: 10px;background: var(--surface);color: var(--brand);cursor: pointer;font-family: inherit}.choice:hover{background: var(--brand-weak)}.choice.is-correct{background: var(--ok);border-color: var(--ok);color: #fff}.choice.is-wrong{background: var(--ng-weak);border-color: var(--ng);color: var(--ng)}.result{min-height: 1.8em;margin: 4px 0;font-weight: 700}.result.ok{color: var(--ok)}.result.ng{color: var(--ng)}.answer{margin-top: 12px;border: 1px solid var(--line);border-radius: 10px;padding: 0 16px;background: var(--surface-2)}.answer summary{cursor: pointer;padding: 12px 0;font-weight: 700;color: var(--brand)}.answer .correct{margin-top: 0;padding: 8px 12px;background: var(--ok-weak);border-radius: 8px}.source{font-size: .85rem;color: var(--muted);margin: 16px 0 0}.pager{display: flex;justify-content: space-between;align-items: center;gap: 8px;margin-top: 20px}.pager a{text-decoration: none;padding: 8px 14px;border: 1px solid var(--line);border-radius: 8px;background: var(--surface)}.about p{margin: 0}.app-cta{margin: 32px 0;background: linear-gradient(135deg,var(--cta-from),var(--surface));border: 1px solid var(--cta-border);border-radius: 16px;padding: 20px}.app-cta-inline{margin: 20px 0 0}.app-cta-head{display: flex;gap: 14px;align-items: center}.app-cta-head img{border-radius: 14px;flex: none;box-shadow: 0 2px 6px rgba(0,0,0,.12)}.app-cta-title{font-weight: 700;font-size: 1.1rem;margin: 0;line-height: 1.5}.app-cta-sub{margin: 2px 0 0;font-size: .9rem;color: var(--muted);line-height: 1.6}.app-cta-points{list-style: none;padding: 0;margin: 16px 0;display: grid;grid-template-columns: repeat(2,1fr);gap: 10px}@media (max-width: 520px){.app-cta-points{grid-template-columns: 1fr}}.app-cta-points li{background: var(--surface);border: 1px solid var(--line);border-radius: 10px;padding: 10px 12px;line-height: 1.6}.app-cta-points strong{display: block;color: var(--brand)}.app-cta-points strong::before{content: "✓ ";color: var(--ok)}.app-cta-points span{font-size: .88rem;color: var(--muted)}.app-cta-buttons{margin: 0;display: flex;gap: 10px;flex-wrap: wrap}.store-btn{display: inline-flex;flex-direction: column;justify-content: center;min-width: 168px;padding: 8px 18px;border-radius: 10px;background: #111;color: #fff;text-decoration: none;font-weight: 700;font-size: 1.05rem;line-height: 1.2}.store-btn small{font-size: .65rem;font-weight: 400;opacity: .85}.store-btn.store-btn-sub{background: var(--surface);color: var(--text);border: 1px solid var(--line)}.hero-app{margin: 12px 0 0;padding: 10px 14px;background: var(--brand-weak);border-radius: 10px;font-size: .95rem}.app-bar{position: fixed;left: 8px;right: 8px;top: 8px;z-index: 50;display: flex;align-items: center;gap: 10px;padding: 8px 10px;background: var(--surface);border: 1px solid var(--line);border-radius: 14px;box-shadow: 0 6px 20px rgba(0,0,0,.15)}.app-bar[hidden]{display: none}.app-bar img{border-radius: 9px;flex: none}.app-bar p{flex: 1;margin: 0;line-height: 1.35;font-size: .85rem}.app-bar p span{display: block;color: var(--muted);font-size: .78rem}.app-bar-btn{flex: none;padding: 8px 16px;border-radius: 999px;background: var(--brand);color: #fff;text-decoration: none;font-weight: 700}.app-bar-close{flex: none;border: 0;background: none;color: var(--muted);font-size: 1.2rem;padding: 4px 6px;cursor: pointer}body.has-app-bar{padding-top: 64px}.btn{display: inline-block;padding: 6px 16px;border-radius: 8px;color: #fff;text-decoration: none;font-weight: 700;font-size: .9rem}.btn.ios{background: var(--ios)}.btn.android{background: var(--android)}.site-footer{background: var(--footer);border-top: 1px solid var(--line);padding: 20px 0;font-size: .85rem;color: var(--muted)}.site-footer .note{margin: 0 0 8px}.footer-links{display: flex;flex-wrap: wrap;gap: 6px 16px;margin: 12px 0}.copy{margin: 0}@media (max-width: 480px){h1{font-size: 1.2rem}.question,.hero{padding: 16px}.choice{flex: 1 1 calc(50% - 10px)}}.progress{display: flex;flex-direction: column;gap: 6px;margin: 4px 0 12px;font-size: .9rem;color: var(--muted)}.progress-bar{height: 6px;background: var(--line);border-radius: 3px;overflow: hidden}.progress-bar span{display: block;height: 100%;background: var(--brand)}.choices{display: flex;flex-direction: column;gap: 10px;margin: 20px 0 8px}.choices.choices-short{flex-direction: row;flex-wrap: wrap}.choice{display: flex;align-items: flex-start;gap: 12px;width: 100%;min-width: 0;padding: 12px 14px;text-align: left;font-size: 1rem;font-weight: 400;line-height: 1.6;border: 2px solid var(--line);border-radius: 12px;background: var(--surface);color: var(--text);cursor: pointer;font-family: inherit;transition: border-color .15s,background .15s}.choices-short .choice{width: auto;flex: 1 1 calc(25% - 10px);justify-content: center;align-items: center}.choice:hover:not(:disabled){border-color: var(--brand);background: var(--brand-weak)}.choice:focus-visible{outline: 3px solid var(--brand);outline-offset: 2px}.choice:disabled{cursor: default}.choice-key{flex: none;display: inline-flex;align-items: center;justify-content: center;width: 2em;height: 2em;border-radius: 50%;background: var(--brand-weak);color: var(--brand);font-weight: 700}.choice-text{flex: 1;min-width: 0;overflow-wrap: anywhere}.choice-text img{max-height: 160px}.choice-mark{flex: none;margin-left: auto;font-weight: 700}.choice.is-correct{border-color: var(--ok);background: var(--ok-weak);color: var(--text)}.choice.is-correct .choice-key{background: var(--ok);color: #fff}.choice.is-correct .choice-mark::after{content: "○";color: var(--ok)}.choice.is-wrong{border-color: var(--ng);background: var(--ng-weak);color: var(--text)}.choice.is-wrong .choice-key{background: var(--ng);color: #fff}.choice.is-wrong .choice-mark::after{content: "×";color: var(--ng)}.choice.is-dim{opacity: .55}.result{display: flex;flex-wrap: wrap;align-items: center;gap: 8px 16px;margin: 12px 0 0;padding: 12px 16px;border-radius: 10px;min-height: 0;font-weight: 400}.result[hidden]{display: none}.result.ok{background: var(--ok-weak);color: var(--ok)}.result.ng{background: var(--ng-weak);color: var(--ng)}.result strong{font-size: 1.1rem}.result-next{margin-left: auto;padding: 8px 16px;border-radius: 8px;background: var(--brand);color: #fff;text-decoration: none;font-weight: 700}.explanation>:first-child{margin-top: 0}.pager a{flex: 1;text-align: center}.pager .up{flex: none}.set-actions{display: flex;flex-wrap: wrap;align-items: center;gap: 8px 16px;margin: 0 0 16px}.btn-primary{display: inline-block;padding: 10px 20px;border-radius: 10px;background: var(--brand);color: #fff;text-decoration: none;font-weight: 700}.set-score{margin: 0;color: var(--muted);font-size: .92rem}.set-score[hidden],.link-button[hidden]{display: none}.link-button{border: 0;background: none;color: var(--muted);text-decoration: underline;cursor: pointer;font: inherit;font-size: .85rem;padding: 0}.qmark{flex: none;margin-left: auto;width: 1.5em;text-align: center;font-weight: 700}.question-list .is-ok .qmark{color: var(--ok)}.question-list .is-ng .qmark{color: var(--ng)}.set-progress{color: var(--ok);font-size: .85rem}.content{min-width: 0}@media (min-width: 860px){.layout{display: grid;grid-template-columns: minmax(0,1fr) 280px;gap: 32px;align-items: start}}.sidebar{display: flex;flex-direction: column;gap: 16px;margin-top: 32px}@media (min-width: 860px){.sidebar{margin-top: 0}}.side-card{background: var(--surface);border: 1px solid var(--line);border-radius: 14px;padding: 16px}.side-title{font-size: 1rem;margin: 0 0 10px;padding-left: 8px;border-left: 4px solid var(--brand)}.side-app{background: linear-gradient(160deg,var(--cta-from),var(--surface) 60%);border-color: var(--cta-border)}.side-app-head{display: flex;gap: 12px;align-items: center}.side-app-head img{flex: none;border-radius: 16px;box-shadow: 0 2px 8px rgba(0,0,0,.15)}.side-app-label{margin: 0;font-size: .75rem;font-weight: 700;color: var(--brand);letter-spacing: .04em}.side-app-name{margin: 2px 0 0;font-weight: 700;line-height: 1.45;font-size: .98rem}.side-app-lead{margin: 12px 0 8px;font-size: .88rem;line-height: 1.65}.side-app-points{list-style: none;margin: 0 0 14px;padding: 0;font-size: .88rem;line-height: 1.6}.side-app-points li{padding-left: 1.4em;position: relative}.side-app-points li + li{margin-top: 4px}.side-app-points li::before{content: "✓";position: absolute;left: 0;color: var(--ok);font-weight: 700}.side-app-buttons{display: flex;flex-direction: column;gap: 8px;margin: 0}.side-app-buttons .store-btn{min-width: 0;text-align: center;align-items: center}.side-ad{text-align: center}.side-ad-label{margin: 0 0 4px;font-size: .7rem;color: var(--muted)}.side-sets ul{list-style: none;margin: 0;padding: 0}@media (min-width: 860px){.side-sets ul{max-height: 60vh;overflow-y: auto}}.side-sets li + li{border-top: 1px solid var(--line)}.side-sets a{display: flex;gap: 8px;align-items: baseline;padding: 8px 4px;text-decoration: none;color: var(--text);font-size: .92rem;border-radius: 6px}.side-sets a:hover{background: var(--brand-weak)}.side-sets .set-title{flex: 1;font-weight: 400}.side-sets .is-current a{background: var(--brand-weak);color: var(--brand);font-weight: 700}.side-more p{margin: 0 0 8px;font-size: .88rem;line-height: 1.7}.side-more p:last-child{margin-bottom: 0}.side-note{color: var(--muted)}.year-switch{display: flex;align-items: center;gap: 8px;margin: 0 0 12px;font-size: .88rem;color: var(--muted)}.year-switch select{flex: 1;max-width: 260px;padding: 6px 10px;font: inherit;color: var(--text);border: 1px solid var(--line);border-radius: 8px;background: var(--surface)}@media (min-width: 860px){.year-switch{display: none}}.ext::after,.ext-icon::before{content: "";display: inline-block;width: .8em;height: .8em;margin-left: .25em;vertical-align: -.05em;background: currentColor;-webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath d='M9 2h5v5h-1.5V4.6L7 10.1 5.9 9l5.5-5.5H9z M3 4h4v1.5H4.5v6h6V9H12v4H3z'/%3E%3C/svg%3E") center/contain no-repeat;mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath d='M9 2h5v5h-1.5V4.6L7 10.1 5.9 9l5.5-5.5H9z M3 4h4v1.5H4.5v6h6V9H12v4H3z'/%3E%3C/svg%3E") center/contain no-repeat}.ext-icon::before{margin: 0 .2em 0 0;color: var(--brand)}.ext-links{list-style: none;margin: 0 0 8px;padding: 0;font-size: .88rem;line-height: 1.9}.ext-caption{font-size: .75rem !important;color: var(--muted)}.resume{display: flex;flex-wrap: wrap;align-items: center;justify-content: space-between;gap: 10px 16px;margin: 0 0 16px;padding: 16px 18px;background: var(--surface);border: 2px solid var(--brand);border-radius: 14px}.resume-text{display: flex;flex-direction: column;gap: 2px}.resume-label{font-size: .8rem;font-weight: 700;color: var(--brand)}.resume-stats{font-size: .85rem;color: var(--muted)}.resume .btn-primary{flex: none}.resume[hidden],.review-bar[hidden],.btn-secondary[hidden]{display: none}.btn-secondary{display: inline-block;padding: 10px 18px;border-radius: 10px;border: 2px solid var(--ng);color: var(--ng);background: var(--surface);text-decoration: none;font-weight: 700}.review-bar{display: flex;align-items: center;gap: 12px;margin: 0 0 10px;padding: 8px 14px;border-radius: 10px;background: var(--ng-weak);color: var(--ng);font-size: .92rem}.review-bar a{margin-left: auto;color: var(--muted);font-size: .85rem}.site-header .wrap{display: flex;flex-wrap: wrap;align-items: center;gap: 8px 20px}.site-title{flex: 1 1 auto}.site-nav{display: flex;align-items: center;gap: 4px 14px;flex-wrap: wrap}.site-nav a{color: #fff;text-decoration: none;font-size: .9rem;font-weight: 700;opacity: .92}.site-nav a:hover{opacity: 1;text-decoration: underline}.nav-search input{width: 11em;padding: 5px 10px;border: 0;border-radius: 999px;font: inherit;font-size: .85rem}@media (max-width: 520px){.site-nav{width: 100%}.nav-search{flex: 1}.nav-search input{width: 100%}}.side-fold>summary{list-style: none;cursor: pointer;display: flex;align-items: center}.side-fold>summary::-webkit-details-marker{display: none}.side-fold>summary .side-title{flex: 1;margin-bottom: 0}.side-fold>summary::after{content: "▾";color: var(--muted);transition: transform .15s}.side-fold:not([open])>summary::after{transform: rotate(-90deg)}.side-fold[open]>summary{margin-bottom: 10px}.float-next{position: fixed;left: 50%;transform: translateX(-50%);top: 10px;z-index: 40;width: min(560px,calc(100% - 16px));display: flex;align-items: center;gap: 12px;padding: 8px 8px 8px 16px;border-radius: 12px;background: var(--surface);border: 1px solid var(--line);box-shadow: 0 6px 20px rgba(0,0,0,.15);font-weight: 700}.float-next[hidden]{display: none}.float-next.ok span{color: var(--ok)}.float-next.ng span{color: var(--ng)}.float-next a{margin-left: auto;padding: 8px 14px;border-radius: 8px;background: var(--brand);color: #fff;text-decoration: none}body.has-app-bar .float-next{top: 72px}.search-form{display: flex;gap: 8px;margin: 0 0 8px}.search-form input{flex: 1;padding: 10px 14px;font: inherit;border: 2px solid var(--line);border-radius: 10px}.search-form input:focus{border-color: var(--brand);outline: none}.search-form button{padding: 10px 18px;border: 0;border-radius: 10px;background: var(--brand);color: #fff;font: inherit;font-weight: 700;cursor: pointer}.search-note{font-size: .85rem;color: var(--muted);margin: 0 0 12px}.search-status{font-weight: 700}.search-results mark{background: var(--mark);color: inherit;padding: 0 1px}.search-results .qsum{-webkit-line-clamp: 3}.qnum-wide{width: 7.5em;font-size: .85rem;line-height: 1.4}@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){--bg: #12161c;--surface: #1b2129;--text: #e4e8ee;--muted: #9aa6b4;--line: #2e3742;--brand: #7fb0e0;--brand-weak: #22303f;--ok: #4cc27f;--ok-weak: #18301f;--ng: #f07a6e;--ng-weak: #3a2020;--surface-2: #171c23;--code: #11151a;--footer: #161b22;--cta-from: #1d2733;--cta-border: #2d3f52;--mark: #6b5a12;--warn: #e8b44a;--warn-weak: #3a2f14;color-scheme: dark}}:root[data-theme="dark"]{--bg: #12161c;--surface: #1b2129;--text: #e4e8ee;--muted: #9aa6b4;--line: #2e3742;--brand: #7fb0e0;--brand-weak: #22303f;--ok: #4cc27f;--ok-weak: #18301f;--ng: #f07a6e;--ng-weak: #3a2020;--surface-2: #171c23;--code: #11151a;--footer: #161b22;--cta-from: #1d2733;--cta-border: #2d3f52;--mark: #6b5a12;--warn: #e8b44a;--warn-weak: #3a2f14;color-scheme: dark}.site-header{background: var(--header,var(--brand))}:root[data-theme="dark"]{--header: #1f3550}@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){--header: #1f3550}}:root[data-theme="dark"] .q-body img,:root[data-theme="dark"] .explanation img{filter: brightness(.92)}:root[data-theme="dark"] .btn-primary,:root[data-theme="dark"] .result-next,:root[data-theme="dark"] .float-next a,:root[data-theme="dark"] .app-bar-btn,:root[data-theme="dark"] .search-form button{color: #0f1720}@media (prefers-color-scheme: dark){:root:not([data-theme="light"]) .q-body img,:root:not([data-theme="light"]) .explanation img{filter: brightness(.92)}:root:not([data-theme="light"]) .btn-primary,:root:not([data-theme="light"]) .result-next,:root:not([data-theme="light"]) .float-next a,:root:not([data-theme="light"]) .app-bar-btn,:root:not([data-theme="light"]) .search-form button{color: #0f1720}}.theme-toggle{border: 1px solid rgba(255,255,255,.5);background: transparent;color: #fff;border-radius: 999px;padding: 3px 10px;font: inherit;font-size: .8rem;cursor: pointer}.q-body img,.explanation img{cursor: zoom-in}.zoom-hint{display: block;text-align: center;font-size: .75rem;color: var(--muted);margin: -6px 0 10px}.lightbox{position: fixed;inset: 0;z-index: 100;background: rgba(0,0,0,.88);overflow: auto;display: flex;align-items: flex-start;justify-content: center;padding: 48px 8px 24px}.lightbox[hidden]{display: none}.lightbox img{max-width: none;width: auto;height: auto;background: #fff;border-radius: 6px;margin: auto;cursor: zoom-out}.lightbox.fit img{max-width: 100%}.lightbox-bar{position: fixed;top: 8px;right: 8px;display: flex;gap: 8px;z-index: 101}.lightbox-bar button{border: 0;border-radius: 999px;padding: 6px 14px;background: rgba(255,255,255,.92);color: #111;font: inherit;font-size: .85rem;font-weight: 700;cursor: pointer}body.no-scroll{overflow: hidden}.peek-note{margin: 8px 0 0;padding: 8px 12px;border-radius: 8px;background: var(--warn-weak);color: var(--warn);font-size: .85rem}.peek-note[hidden]{display: none}.question-list .is-peek .qmark{color: var(--warn)}.kbd-hint{display: none;margin: 10px 0 0;font-size: .78rem;color: var(--muted)}.kbd-hint kbd{display: inline-block;min-width: 1.6em;padding: 0 4px;border: 1px solid var(--line);border-bottom-width: 2px;border-radius: 4px;background: var(--surface-2);font: inherit;font-size: .75rem;text-align: center}@media (hover: hover) and (pointer: fine){.kbd-hint{display: block}}.result-card{background: var(--surface);border: 2px solid var(--brand);border-radius: 14px;padding: 18px 20px;margin: 0 0 20px}.result-card[hidden]{display: none}.result-card h2{margin: 0 0 10px;border: 0;padding: 0}.result-stats{display: flex;flex-wrap: wrap;gap: 8px 24px;margin: 0 0 12px}.result-stats div{display: flex;flex-direction: column}.result-stats strong{font-size: 1.6rem;line-height: 1.2;color: var(--brand)}.result-stats span{font-size: .8rem;color: var(--muted)}.result-wrong{margin: 8px 0 12px;padding: 0;list-style: none;display: flex;flex-wrap: wrap;gap: 6px}.result-wrong a{display: inline-block;padding: 2px 10px;border-radius: 999px;background: var(--ng-weak);color: var(--ng);text-decoration: none;font-size: .85rem;font-weight: 700}.result-wrong a.peek{background: var(--warn-weak);color: var(--warn)}.hdr-btn{display: none;flex: none;border: 0;background: transparent;color: #fff;padding: 6px;border-radius: 8px;cursor: pointer;line-height: 0}.hdr-btn:hover{background: rgba(255,255,255,.12)}@media (max-width: 640px){.site-header .wrap{flex-wrap: nowrap;gap: 4px}.site-title{min-width: 0;overflow: hidden;text-overflow: ellipsis;white-space: nowrap;font-size: .95rem}.hdr-btn{display: inline-flex}.site-nav{display: none}.site-header.nav-open .wrap{flex-wrap: wrap}.site-header.nav-open .site-nav{display: flex;width: 100%;flex-direction: column;align-items: stretch;gap: 10px;padding: 8px 0 4px}.site-header.nav-open .site-nav a{padding: 6px 2px}.site-header.nav-open .nav-search{order: -1}.site-header.nav-open .nav-search input{width: 100%;padding: 9px 14px;font-size: 1rem}.site-header.nav-open .theme-toggle{align-self: flex-start}}.nf-sets{margin-bottom: 16px}@media (max-width: 859px){.float-next,body.has-app-bar .float-next{top: auto;bottom: calc(12px + var(--anchor,0px) + env(safe-area-inset-bottom,0px))}.float-next a{padding: 12px 18px}}.store-btn{flex-direction: row;align-items: center;gap: 10px}.store-btn>span{display: flex;flex-direction: column;text-align: left}.store-mark{width: 26px;height: 26px;flex: none}.side-app-buttons .store-btn{justify-content: center}:root[data-theme="dark"] .store-btn{border: 1px solid #555}@media (prefers-color-scheme: dark){:root:not([data-theme="light"]) .store-btn{border: 1px solid #555}}.hero-app{display: flex;flex-direction: column;align-items: center;gap: 10px;text-align: center}.hero-app p{margin: 0}.hero-app-buttons{display: flex;gap: 8px;flex-wrap: wrap;justify-content: center}.hero-app-buttons .store-btn{min-width: 0;padding: 5px 12px;font-size: .9rem;gap: 7px}.hero-app-buttons .store-mark{width: 20px;height: 20px}.hero-app-buttons .store-btn small{font-size: .58rem}.speak{margin: 4px 0 12px;padding: 6px 14px;border: 1px solid var(--line);border-radius: 999px;background: var(--surface);color: inherit;font: inherit;font-size: .9em;cursor: pointer}.speak[hidden]{display: none}.q-instruction{margin: 0 0 8px;color: var(--muted);font-size: .9em}.q-body img[src^="/img/sign/"]{max-height: 140px;width: auto}.vec{display: inline-block;position: relative;padding-top: .45em;line-height: 1}.vec::before{content: "→";position: absolute;top: -.1em;left: 0;right: 0;text-align: center;font-size: .7em}.calc-open{position: fixed;right: 16px;bottom: 16px;z-index: 60;padding: 10px 16px;border: 1px solid var(--line);border-radius: 999px;background: var(--surface);color: inherit;font: inherit;box-shadow: 0 2px 8px rgba(0,0,0,.15);cursor: pointer}.calc{position: fixed;right: 16px;bottom: 68px;z-index: 61;width: min(300px,calc(100vw - 32px));padding: 12px;border: 1px solid var(--line);border-radius: 12px;background: var(--surface);box-shadow: 0 6px 24px rgba(0,0,0,.25)}.calc[hidden]{display: none}.calc-head{display: flex;justify-content: space-between;align-items: center;font-weight: 700;margin-bottom: 4px}.calc-close{border: 0;background: none;color: inherit;font-size: 1.4em;line-height: 1;cursor: pointer}.calc-expr{min-height: 1.2em;text-align: right;color: var(--muted);font-size: .85em}.calc-value{text-align: right;font-size: 1.8em;font-variant-numeric: tabular-nums;overflow-x: auto;white-space: nowrap}.calc-keys{display: grid;grid-template-columns: repeat(4,1fr);gap: 6px;margin-top: 8px}.calc-keys button{padding: 12px 0;border: 1px solid var(--line);border-radius: 8px;background: var(--bg);color: inherit;font: inherit;font-size: 1.1em;cursor: pointer}.calc-keys button.op{background: var(--brand);border-color: transparent;color: #fff}.related-links,.side-card .related-links{list-style: none;padding: 0;margin: 8px 0 0;display: grid;grid-template-columns: repeat(auto-fill,minmax(200px,1fr));gap: 6px}.side-related .related-links{grid-template-columns: 1fr}.related-links a,.side-card .related-links a{display: block;padding: 8px 12px;border: 1px solid var(--line);border-radius: 8px;background: var(--surface);text-decoration: none}.related-links a:hover{border-color: var(--brand)}.other-questions{margin: 24px 0 8px}.other-questions h2{font-size: 1rem}.other-questions ul{list-style: none;padding: 0;margin: 0;border-top: 1px solid var(--line)}.other-questions li a{display: flex;gap: 10px;padding: 10px 4px;border-bottom: 1px solid var(--line);text-decoration: none;color: inherit}.other-questions .qnum{flex: none;color: var(--brand);font-weight: 700}