/* Answers Design System v3 · 20261013c · Paper light (am paper palette), serif reading, no dependencies. */
:root{color-scheme:light;--bg:#f5f2ea;--surface:#fdfbf6;--surface-solid:#fdfbf6;--ink:#1f1c17;--ink-2:#57514a;--ink-3:#8c867b;--tint:#8c2f1e;--tint-soft:#f5e5df;--violet:#6b4f73;--cyan:#3e6f63;--ok:#2e6a3b;--warn:#7f5300;--err:#a3251b;--hairline:#d6cec0;--glass:rgba(253,251,246,.86);--shadow:none;--shadow-hover:none;--blue-wash:#edf0e6;--lilac-wash:#f0ebe3;--warm-wash:#f6ead7;--hero-light:#eae2cc;--font:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;--font-serif:"Iowan Old Style","Palatino Linotype",Palatino,Georgia,"Songti SC","STSong","Noto Serif CJK SC","Source Han Serif SC",serif;--mono:ui-monospace,"Cascadia Code",Consolas,monospace;--r-lg:6px;--r-md:5px;--r-sm:3px;--r-pill:999px;--s1:4px;--s2:8px;--s3:12px;--s4:16px;--s5:24px;--s6:32px;--s7:48px;--t-micro:160ms;--t-standard:320ms;--t-emph:640ms;--spring:cubic-bezier(.22,1,.36,1);--spring-emph:cubic-bezier(.2,.8,.2,1);--spring-sheet:cubic-bezier(.32,.72,0,1);--muted-foreground:var(--ink-2)}
@supports(transition-timing-function:linear(0,1)){:root{--spring-emph:linear(0,.12,.36,.62,.82,.95,1.018,1.03,1.018,1.006,1)}}
*{box-sizing:border-box}img,video,iframe{max-width:100%;height:auto}html{scroll-behavior:smooth;scroll-padding-top:105px;-webkit-text-size-adjust:100%}body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.65 var(--font);-webkit-font-smoothing:antialiased}button,input{font:inherit}button,a,input{-webkit-tap-highlight-color:transparent}a{color:var(--tint);text-decoration:none}a:hover{text-decoration:underline;text-underline-offset:4px}button{cursor:pointer}svg{display:block}::selection{background:var(--tint-soft)}:focus-visible{outline:3px solid var(--tint);outline-offset:5px}h1,h2,h3,p{margin:0}h1,h2,h3{line-height:1.18;letter-spacing:0;font-family:var(--font-serif)}h1{font-size:clamp(36px,5vw,60px);font-weight:600}h2{font-size:clamp(28px,3vw,38px);font-weight:600}h3{font-size:22px;font-weight:600}p+p{margin-top:12px}small,.muted{color:var(--ink-2);font-size:14px}.lead{font-size:clamp(17px,2vw,20px);line-height:1.75;color:var(--ink-2);max-width:42em}.meta{font-size:12px;color:var(--ink-3);letter-spacing:.015em}.kicker{font-size:12px;letter-spacing:.14em;font-weight:600;text-transform:uppercase;color:var(--ink-2);margin-bottom:20px}.text-gradient,.accent{color:var(--tint)}strong{font-weight:600}[hidden]{display:none!important}.skip-link{position:fixed;left:16px;top:-100px;z-index:1000;padding:12px 24px;background:var(--surface);border-radius:4px}.skip-link:focus{top:12px}
.shell{max-width:1160px;padding:0 36px;margin:auto}.page{max-width:900px;margin:auto;padding:140px 28px 90px}.page-head{margin-bottom:64px}.page-head .lead{margin-top:24px}.page>section{margin:64px 0}.page section>h2{margin-bottom:24px}.page p{overflow-wrap:anywhere}.page p,.page li,.page blockquote,.lead,.callout{font-family:var(--font-serif)}.page table,.page .kicker,.page .meta,.page .badge,.page .btn{font-family:var(--font)}.nav-wrap{position:fixed;z-index:100;top:18px;left:0;right:0;padding:0 24px}.nav-glass{max-width:1088px;margin:auto;min-height:60px;padding:8px 14px 8px 20px;display:flex;align-items:center;gap:24px;border:1px solid var(--hairline);border-radius:6px;background:var(--glass);box-shadow:none;backdrop-filter:blur(20px) saturate(150%);-webkit-backdrop-filter:blur(20px) saturate(150%)}body>.nav-glass{position:fixed;top:18px;left:24px;right:24px;z-index:100}.brand{display:flex;align-items:center;gap:10px;color:var(--ink);font-size:17px;font-weight:650;white-space:nowrap}.brand:hover{text-decoration:none}.brand-mark{width:27px;height:27px;flex:none}.brand .dot{width:16px;height:16px;border:4px solid var(--ink);border-radius:50%}.nav-links{display:flex;align-items:center;gap:28px;margin-left:auto}.nav-links a,.nav-glass>a:not(.brand){color:var(--ink-2);font-size:13px;white-space:nowrap}.nav-links a[aria-current=page]{color:var(--ink)}.theme-button{width:38px;height:38px;display:grid;place-items:center;border:1px solid var(--hairline);border-radius:50%;background:var(--surface);color:var(--ink);flex:none}.theme-button svg{width:17px;height:17px}.theme-button:hover{background:var(--tint-soft)}
.hero{padding:174px 0 90px}.hero-split{display:grid;grid-template-columns:1.08fr 1fr;gap:40px;align-items:center}.hero h1{font-size:clamp(44px,5.6vw,72px);line-height:1.12;letter-spacing:0}.hero .lead{margin:26px 0 30px;font-size:18px;max-width:30em}.hero .kicker{margin-bottom:25px}.actions{display:flex;gap:18px;align-items:center;flex-wrap:wrap}.btn{display:inline-flex;justify-content:center;align-items:center;gap:9px;border:1px solid var(--hairline);border-radius:var(--r-pill);background:var(--surface);color:var(--ink);padding:11px 22px;min-height:46px;font-size:14px;font-weight:500;transition:transform var(--t-standard) var(--spring-emph),box-shadow var(--t-standard) ease,background var(--t-micro) ease}.btn:hover{text-decoration:none;box-shadow:var(--shadow);transform:translateY(-2px)}.btn:active{transform:scale(.975)}.btn-primary{background:var(--tint);color:#fdfbf6;border-color:transparent}.btn-link{padding:10px 0;color:var(--tint);border:0;background:none}.btn-link:hover{box-shadow:none}.btn svg{width:17px;height:17px}.quiet-note{margin-top:28px;color:var(--ink-3);font-size:12px}.hero-rule{border-top:1px solid var(--hairline);padding-top:24px;display:flex;justify-content:space-between;gap:20px;font-size:12px;color:var(--ink-2)}
.scene{position:relative;height:370px;isolation:isolate;perspective:1100px}.scene::before{content:"";position:absolute;inset:4% -4% -6%;z-index:-1;background:radial-gradient(ellipse,var(--hero-light),transparent 68%)}.scene-sheet{position:absolute;border:1px solid var(--hairline);border-radius:6px;background:var(--surface);box-shadow:none}.sheet-back{inset:28px 10px 40px 56px;transform:rotate(8deg);background:var(--blue-wash)}.sheet-mid{inset:34px 24px 30px 34px;transform:rotate(-5deg);background:var(--glass);backdrop-filter:blur(12px)}.sheet-front{inset:48px 25px 16px 18px;padding:27px 30px;transform:rotate(-1deg)}.window-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:29px;color:var(--ink-3);font-size:10px;letter-spacing:.08em}.window-dots{display:flex;gap:5px}.window-dots i{width:6px;height:6px;border-radius:50%;background:var(--hairline)}.sheet-front h2{font-size:30px;line-height:1.35;letter-spacing:0}.sheet-front .meta{margin-top:14px}.paper-lines{display:grid;gap:8px;margin-top:24px}.paper-lines span{height:5px;border-radius:3px;background:var(--hairline)}.paper-lines span:last-child{width:65%}.floating-tag{position:absolute;right:0;bottom:0;display:flex;align-items:center;gap:9px;padding:12px 18px;border:1px solid var(--hairline);border-radius:4px;background:var(--glass);backdrop-filter:blur(18px);box-shadow:var(--shadow);font-size:12px}.status-dot{width:6px;height:6px;border-radius:50%;background:var(--ok)}
.section{margin:80px 0}.section-heading{display:flex;align-items:end;justify-content:space-between;gap:24px;margin-bottom:28px}.section-heading .kicker{margin-bottom:12px}.section-heading>p{font-size:14px;color:var(--ink-2)}.bento{display:grid;grid-template-columns:1.25fr 1fr 1fr;gap:18px}.feature{position:relative;display:flex;flex-direction:column;min-height:344px;padding:28px;border:1px solid transparent;border-radius:var(--r-lg);color:var(--ink);background:var(--surface);overflow:hidden;transition:transform var(--t-standard) var(--spring),box-shadow var(--t-standard) ease}.feature:hover{transform:translateY(-5px);box-shadow:var(--shadow-hover);text-decoration:none}.feature .kicker{font-size:10px;margin-bottom:14px}.feature p{font-size:13px;color:var(--ink-2);margin-top:12px}.feature h3{font-size:25px}.feature .arrow-circle{position:absolute;bottom:24px;right:24px}.feature-art{height:146px;margin:22px 0 10px;display:grid;place-items:center}.feature-art svg{width:100%;height:140px}.blue{background:var(--blue-wash)}.lilac{background:var(--lilac-wash)}.warm{background:var(--warm-wash)}.arrow-circle{width:30px;height:30px;display:grid;place-items:center;border:1px solid var(--hairline);background:var(--glass);border-radius:50%;font-size:17px;transition:transform var(--t-standard) var(--spring)}a:hover .arrow-circle{transform:translateX(3px)}.calendar-art{text-align:center;font-size:70px;line-height:1;font-weight:300;letter-spacing:-.05em;color:var(--ink)}.calendar-art span{display:block;font-size:10px;letter-spacing:.12em;margin-bottom:10px;color:var(--warn)}
.tool-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.tool-card{display:flex;align-items:center;gap:16px;padding:23px;border:1px solid var(--hairline);border-radius:6px;color:var(--ink);background:var(--surface);transition:transform var(--t-standard) var(--spring)}.tool-card:hover{text-decoration:none;transform:translateY(-3px)}.tool-icon{width:40px;height:40px;display:grid;place-items:center;background:var(--bg);border-radius:4px;color:var(--ink-2);flex:none}.tool-icon svg{width:22px;height:22px}.tool-card h3{font-size:16px;letter-spacing:0}.tool-card p{font-size:12px;color:var(--ink-2);margin-top:5px}.tool-card>span:last-child{margin-left:auto;color:var(--ink-3)}.footer{padding:32px 0 38px;border-top:1px solid var(--hairline);display:flex;justify-content:space-between;gap:20px;color:var(--ink-3);font-size:12px}.footer a{color:var(--ink-2)}.reserved{margin:30px 0 60px;color:var(--ink-3);font-size:12px}.reserved summary{cursor:pointer;width:fit-content;padding:8px 0}.reserved p{padding:12px 0;line-height:2}
.library-hero{padding-bottom:58px}.library-hero h1{font-size:clamp(43px,5vw,65px)}.library-feature{padding:32px;border:1px solid var(--hairline);background:var(--surface);border-radius:6px;position:relative;min-height:285px;display:flex;flex-direction:column;color:var(--ink);box-shadow:var(--shadow)}.library-feature:hover{text-decoration:none}.library-feature h2{font-size:32px;margin-top:22px;line-height:1.25}.library-feature .meta{margin-top:16px}.library-feature .feature-bottom{display:flex;align-items:center;justify-content:space-between;margin-top:auto;padding-top:30px;color:var(--tint);font-size:13px}.mini-stack{position:absolute;right:30px;top:32px;display:flex;gap:4px;align-items:end;height:25px}.mini-stack i{width:5px;height:12px;border-radius:4px;background:var(--tint);opacity:.35}.mini-stack i:nth-child(2){height:20px;opacity:.65}.mini-stack i:nth-child(3){height:28px;opacity:1}.library-tools{display:flex;align-items:center;justify-content:space-between;gap:20px;margin:26px 0}.filters{display:flex;padding:4px;border-radius:var(--r-pill);border:1px solid var(--hairline);gap:3px;background:var(--bg)}.filter{border:0;padding:8px 18px;min-height:40px;border-radius:var(--r-pill);background:transparent;font-size:13px;color:var(--ink-2);transition:background var(--t-micro) ease,color var(--t-micro) ease,box-shadow var(--t-micro) ease}.filter[aria-pressed=true]{background:var(--surface);color:var(--ink);box-shadow:0 2px 7px #0000000c}.search{display:flex;align-items:center;gap:10px;background:var(--surface);border:1px solid var(--hairline);border-radius:4px;padding:0 15px;max-width:320px;flex:1;color:var(--ink-3)}.search:focus-within{outline:2px solid var(--tint);outline-offset:2px}.search svg{width:17px;height:17px;flex:none}.search input{width:100%;height:46px;background:none;border:0;outline:none;color:var(--ink);font-size:13px}.search input::placeholder{color:var(--ink-3)}.search input:focus-visible{outline:none}.results-meta{margin-bottom:20px;font-size:12px;color:var(--ink-3)}.article-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.article-card{display:flex;flex-direction:column;min-width:0;padding:28px;border:1px solid var(--hairline);background:var(--surface);border-radius:6px;min-height:235px;transition:transform var(--t-standard) var(--spring),box-shadow var(--t-standard) ease;color:var(--ink)}.article-card:hover{text-decoration:none;transform:translateY(-4px);box-shadow:var(--shadow)}.article-card .card-top{display:flex;justify-content:space-between;font-size:11px;color:var(--ink-3);margin-bottom:23px}.article-card h3{font-size:22px;line-height:1.4;overflow-wrap:anywhere}.article-card p{font-size:14px;color:var(--ink-2);margin:12px 0 26px;overflow-wrap:anywhere}.article-card .card-bottom{margin-top:auto;display:flex;justify-content:space-between;align-items:center;color:var(--ink-3);font-size:11px}.empty-state{text-align:center;padding:70px 20px;border:1px dashed var(--hairline);border-radius:6px}.empty-state p{color:var(--ink-2);margin:15px 0 24px}
.grid2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.card{background:var(--surface);border:1px solid var(--hairline);border-radius:6px;padding:28px;margin:18px 0}.grid2>.card{margin:0}.card h3{margin-bottom:14px}.card.hoverable{transition:transform var(--t-standard) var(--spring)}.card.hoverable:hover{transform:translateY(-3px)}.site-card{display:block;color:var(--ink)}.site-card .head{display:flex;gap:10px;align-items:center}.site-card .head .arrow{margin-left:auto}.site-card .desc{color:var(--ink-2);font-size:14px;margin-top:10px}.badge{display:inline-block;padding:4px 10px;border-radius:6px;background:var(--tint-soft);color:var(--tint);font-size:11px;font-weight:550}.badge.ok{color:var(--ok)}.badge.warn{color:var(--warn)}.badge.err{color:var(--err)}.badge.dim{color:var(--ink-3);background:var(--bg)}.callout{border-left:3px solid var(--tint);border-radius:0 18px 18px 0;padding:20px 24px;background:var(--surface);margin:20px 0}.callout.ok{border-color:var(--ok)}.callout.warn{border-color:var(--warn)}.callout.err{border-color:var(--err)}code{font-family:var(--mono);font-size:.88em;background:var(--tint-soft);padding:2px 5px;border-radius:5px;overflow-wrap:anywhere}pre{padding:24px;border:1px solid var(--hairline);border-radius:4px;background:var(--surface);overflow:auto}pre code{padding:0;background:none;white-space:pre;font-size:12px}table{width:100%;border-collapse:collapse;font-size:14px;margin:24px 0}td,th{text-align:left;padding:15px 12px;border-bottom:1px solid var(--hairline);vertical-align:top;overflow-wrap:anywhere}th{font-size:12px;color:var(--ink-2);font-weight:500}hr{border:0;border-top:1px solid var(--hairline);margin:32px 0}li{margin:10px 0}blockquote{border-left:2px solid var(--tint);margin:24px 0;padding:12px 24px;color:var(--ink-2)}
.demo-stage{padding:36px;border:1px solid var(--hairline);border-radius:6px;background:var(--blue-wash)}.output-example{max-width:540px;margin:auto;padding:30px;border:1px solid var(--hairline);border-radius:6px;background:var(--surface);box-shadow:var(--shadow)}.output-example h3{font-size:26px;margin:18px 0}.output-example p{font-size:15px;color:var(--ink-2)}.demo-evidence{margin-top:22px;padding-top:18px;border-top:1px solid var(--hairline);display:flex;align-items:center;gap:9px;font-size:12px;color:var(--ok)}.demo-toolbar{display:flex;align-items:center;justify-content:space-between;margin-top:24px;gap:20px}.demo-toolbar p{font-size:12px;color:var(--ink-2)}.timing-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:24px}.timing-card{padding:22px;border-top:1px solid var(--hairline)}.timing-card strong{font-size:28px;display:block;line-height:1.3}.timing-card span{font-size:12px;color:var(--ink-2)}.token-list{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}.token-swatch{display:flex;align-items:center;gap:15px;padding:16px;border:1px solid var(--hairline);border-radius:4px;font-size:13px}.token-swatch i{width:34px;height:34px;border-radius:50%;border:1px solid var(--hairline)}.code-head{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-top:30px}.code-head h3{font-size:18px}.copy-status{font-size:12px;color:var(--ink-2)}.reading-progress{position:fixed;top:0;left:0;z-index:101;height:2px;background:var(--tint);width:100%;transform:scaleX(0);transform-origin:left;pointer-events:none}
.demo-toolbar .btn{white-space:nowrap;flex-shrink:0}.page[id=main]>h3{margin:32px 0 16px}body>p.meta,body>p[style]{max-width:844px;margin:0 auto 40px;padding:0 24px}
/* Content is always visible by default. JS uses temporary Web Animations only. */
[data-reveal]{opacity:1;transform:none;filter:none}.nav-glass[data-reveal]{opacity:1;transform:none}.js-only{display:none}html.enhanced .js-only{display:flex}
@media(hover:none){.feature:hover,.article-card:hover,.tool-card:hover,.btn:hover{transform:none}}
@media(max-width:850px){.hero-split{gap:20px}.hero h1{font-size:52px}.scene{height:340px}.sheet-front{padding:24px;inset:48px 12px 20px 8px}.sheet-front h2{font-size:26px}.bento{grid-template-columns:1fr 1fr}.bento .feature:first-child{grid-column:1/-1;min-height:270px}.bento .feature:first-child .feature-art{position:absolute;right:35px;top:24px;width:45%;height:190px}.bento .feature:first-child p{max-width:43%}.tool-grid{grid-template-columns:1fr}.tool-card{padding:20px}.nav-links{gap:22px}}
@media(max-width:640px){.shell{padding:0 22px}.nav-wrap{top:12px;padding:0 12px}.nav-glass{min-height:56px;padding:6px 10px 6px 15px;gap:15px;border-radius:4px}.brand{font-size:15px;gap:8px}.brand-mark{width:23px;height:23px}.nav-links{gap:16px}.nav-links .desktop-link{display:none}.nav-links a{font-size:12px}.theme-button{width:34px;height:34px}.hero{padding:130px 0 50px}.hero-split{grid-template-columns:1fr;gap:18px}.hero h1{font-size:clamp(39px,10.6vw,58px)}.hero .lead{font-size:16px;max-width:28em;margin:22px 0 25px}.hero .kicker{font-size:10px;margin-bottom:20px}.scene{height:310px;max-width:400px;width:100%;margin:12px auto 0}.sheet-front{inset:32px 20px 16px 16px}.sheet-front h2{font-size:26px}.sheet-back{inset:17px 22px 38px 42px}.sheet-mid{inset:21px 25px 25px 32px}.window-top{margin-bottom:20px}.floating-tag{right:6px}.quiet-note{margin-top:22px}.hero-rule{font-size:10px;gap:12px}.section{margin:56px 0}.section-heading{align-items:start}.section-heading>p{display:none}.section-heading h2{font-size:29px}.bento{gap:14px}.feature{padding:23px;min-height:290px;border-radius:6px}.feature h3{font-size:21px}.feature p{font-size:12px}.feature-art{height:115px}.feature-art svg{height:110px}.bento .feature:first-child{min-height:250px}.bento .feature:first-child .feature-art{right:16px;width:43%;top:60px}.bento .feature:first-child h3{max-width:55%}.bento .feature:first-child p{max-width:51%}.calendar-art{font-size:60px}.feature .arrow-circle{bottom:19px;right:19px}.library-feature{margin-top:20px;min-height:260px;padding:28px}.library-feature h2{font-size:29px}.library-tools{flex-direction:column;align-items:stretch;gap:16px}.filters{align-self:start}.filter{padding:7px 15px}.search{max-width:none;flex:auto}.article-grid{grid-template-columns:1fr;gap:14px}.article-card{padding:24px;min-height:230px}.article-card h3{font-size:21px}.footer{flex-direction:column;gap:10px}.page{padding:124px 22px 60px}.page h1{font-size:37px}.grid2{grid-template-columns:1fr}.demo-stage{padding:20px}.output-example{padding:23px}.output-example h3{font-size:23px}.demo-toolbar{align-items:start}.demo-toolbar p{max-width:55%}.timing-grid{gap:4px}.timing-card{padding:18px 8px}.timing-card strong{font-size:24px}.token-list{grid-template-columns:1fr}.card{padding:23px}.page>section{margin:48px 0}td,th{padding:12px 8px;font-size:12px}body>.nav-glass{left:12px;right:12px;gap:12px}body>.nav-glass>a:not(.brand):nth-of-type(n+3){display:none}}
@media(max-width:640px){.bento{grid-template-columns:1fr}.bento .feature,.bento .feature:first-child{min-height:235px}.bento .feature h3{max-width:100%;font-size:23px}.bento .feature p{max-width:55%}.bento .feature .feature-art,.bento .feature:first-child .feature-art{position:absolute;right:18px;top:84px;width:42%;height:105px;margin:0}.calendar-art{font-size:42px}.calendar-art span{font-size:8px}.page[id=main]>h3{margin:32px 0 16px}body>p.meta,body>p[style]{max-width:844px;margin:0 auto 40px;padding:0 24px}}
@media(max-width:360px){.shell{padding:0 18px}.nav-links{gap:10px}.nav-glass{gap:10px}.brand{font-size:14px}.feature{padding:20px}.feature h3{font-size:19px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{animation:none!important;transition:none!important}.feature:hover,.article-card:hover,.tool-card:hover,.btn:hover,.btn:active,.card.hoverable:hover,a:hover .arrow-circle{transform:none}.reading-progress{display:none}}
@media print{body{background:#fff;color:#000}.nav-wrap,.nav-glass,.reading-progress,.js-only,.scene,.skip-link{display:none!important}.page,.hero{padding-top:0}.card,.article-card,.feature,.output-example{box-shadow:none;break-inside:avoid;border:1px solid #ccc}a{color:inherit}h1,h2,h3{break-after:avoid}}