/* taste-skill-ignore: approved PDFBoard warm paper brand, UI-DESIGN.md. */
:root{--paper:#faf9f5;--linen:#d3cec2;--cream:#f0eee6;--ink:#141413;--accent:#97472f;--muted:#565249;--space:clamp(20px,4vw,64px);font-family:"Microsoft YaHei UI","Microsoft YaHei",system-ui,sans-serif;color:var(--ink);background:var(--paper);font-synthesis:none} /* taste-skill-ignore: preserve approved palette */
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-size:17px;line-height:1.8}a{color:inherit;text-underline-offset:5px}a:hover{color:var(--accent)}a:focus-visible,button:focus-visible,summary:focus-visible,input:focus-visible{outline:3px solid var(--accent);outline-offset:5px}button,input{font:inherit}img{display:block;max-width:100%;height:auto}figure{margin:0}figcaption{font-size:16px;color:var(--muted);margin-top:14px}h1,h2,h3,p{margin-top:0}h1,h2,h3{line-height:1.25;text-wrap:balance}h1{font-size:clamp(40px,5.4vw,78px);font-weight:650;letter-spacing:-.04em;margin-bottom:28px}h2{font-size:clamp(28px,3vw,44px);font-weight:600;margin-bottom:24px}h3{font-size:23px;margin-bottom:16px}p{margin-bottom:20px}ul,ol{padding-left:1.5em}li{margin-bottom:10px}.wrap{max-width:1440px;margin:auto;padding-inline:var(--space)}.top{display:flex;justify-content:space-between;align-items:center;padding-block:24px;gap:20px}.brand{display:flex;align-items:center;gap:12px;font-size:23px;font-weight:650;text-decoration:none}.brand img{width:40px;height:40px}.top nav{display:flex;gap:26px;flex-wrap:wrap}.top nav a{min-height:44px;display:flex;align-items:center;text-decoration:none}.button{display:inline-flex;align-items:center;justify-content:center;min-height:50px;padding:12px 24px;background:var(--accent);color:var(--paper);text-decoration:none;font-weight:600;border:0;cursor:pointer;transition:transform .18s}.button:hover{color:var(--paper);transform:translateY(-2px)}.button:active{transform:translateY(1px)}.text-link{display:inline-flex;align-items:center;min-height:44px}.skip{position:absolute;left:20px;top:-80px;background:var(--paper);padding:12px;z-index:2}.skip:focus{top:10px}.hero{padding-block:64px 52px;display:grid;grid-template-columns:.9fr 1.1fr;gap:52px;align-items:center}.hero p{max-width:33em;font-size:20px}.hero figure{background:var(--linen);padding:16px}.hero figure img{width:100%}.hero figcaption{color:var(--ink)}.hero .actions{display:flex;align-items:center;gap:24px;flex-wrap:wrap}.note{font-size:16px!important;color:var(--muted);margin-top:22px}.chapter{padding-block:84px}.band{background:var(--cream)}.split{display:grid;grid-template-columns:1fr 1fr;gap:64px;align-items:center}.split .picture{background:var(--linen);padding:28px}.picture img{max-height:460px;width:auto;margin-inline:auto}.small-pictures{display:grid;grid-template-columns:1fr 1fr;gap:28px;align-items:start}.small-pictures img{max-height:390px;width:auto;margin:auto}.intro{max-width:42em}.download{background:var(--linen)}.download .facts{display:grid;grid-template-columns:1fr 1fr;gap:12px 30px;margin:25px 0}.facts dt{color:var(--muted)}.facts dd{margin:0}.status{font-size:23px;font-weight:600}.faq{max-width:900px}.faq details{padding:18px 22px;background:var(--cream);margin:12px 0}.faq summary{cursor:pointer;min-height:44px;display:list-item;font-weight:600}.faq details p{margin:12px 0 0}.footer{padding-block:50px;background:var(--ink);color:var(--paper)}.footer .wrap{display:flex;justify-content:space-between;gap:40px;flex-wrap:wrap}.footer a:hover{color:var(--linen)}.footer p{max-width:42em}.footer strong{font-size:32px}.doc{max-width:1060px;padding-block:50px 70px}.doc h1{font-size:42px}.doc section{margin-block:50px}.doc .lead{font-size:20px}.doc figure{margin-block:24px}.doc figure img{max-height:540px;max-width:100%;width:auto}.notice{background:var(--cream);padding:24px}.toc{display:flex;gap:12px 28px;flex-wrap:wrap}.toc a{min-height:44px;display:flex;align-items:center}.table-wrap{overflow-x:auto}table{width:100%;border-collapse:collapse;text-align:left}th,td{padding:12px;border-bottom:1px solid var(--linen)}th{background:var(--cream)}.feedback{white-space:pre-wrap;background:var(--cream);padding:24px;font-family:inherit}.checklist label{display:flex;align-items:flex-start;gap:12px;margin-bottom:18px}.checklist input{width:22px;height:22px;flex-shrink:0;margin-top:5px;accent-color:var(--accent)}.print-button{margin-top:24px}.reveal{animation:arrive .6s both}.reveal:nth-child(2){animation-delay:.08s}.reveal:nth-child(3){animation-delay:.16s}@keyframes arrive{from{opacity:.6;transform:translateY(16px)}to{opacity:1;transform:none}}
@media(max-width:900px){.hero{grid-template-columns:1fr;padding-top:36px;gap:30px}.hero h1 br{display:none}.hero figure{max-width:700px}.split{gap:32px}.chapter{padding-block:60px}.top nav{gap:18px}}
@media(max-width:600px){body{font-size:17px}.top{align-items:flex-start;flex-direction:column;gap:8px;padding-block:16px}.top nav{width:100%;justify-content:space-between;gap:10px}.brand{font-size:22px}.hero{padding-top:24px;padding-bottom:36px}.hero h1{font-size:40px}.hero p{font-size:18px}.hero figure{padding:8px}.split{grid-template-columns:1fr;gap:24px}.chapter{padding-block:44px}.small-pictures{gap:16px}.picture{padding:16px!important}.doc{padding-top:30px}.doc h1{font-size:34px}.doc section{margin-block:36px}.footer .wrap{gap:16px}.notice{padding:18px}.download .facts{grid-template-columns:1fr}.facts dd{margin-bottom:12px}th,td{padding:8px;font-size:15px}}
@media(prefers-reduced-motion:no-preference){.entering{animation:arrive .55s ease-out both}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{animation:none!important;transition:none!important}}
@media print{.top,.footer,.print-button,.skip,.toc{display:none}body{font-size:11pt;background:white;color:black}.wrap{padding:0;max-width:none}.doc{padding:0}.doc h1{font-size:22pt}.doc h2{font-size:16pt}.doc section{margin:18pt 0}.doc p{margin-bottom:8pt}.notice{padding:10pt}.doc figure img{max-height:250px}a{color:black;text-decoration:none}tr,figure{break-inside:avoid}.trial{font-size:10pt}.trial h1{font-size:20pt}.trial td,.trial th{font-size:10pt;padding:6pt}@page{size:A4;margin:16mm}}

/* Tutorial navigation uses a filled button, distinct from inline text links. */
.button-secondary{background:var(--ink);color:var(--paper);margin-block:8px 18px}.button-secondary:hover{background:var(--accent);color:var(--paper)}
