:root{--primary:#6C4FF8;--primary-soft:#9B8AFB;--ink:#252331;--muted:#716E7E;--deep:#1E1B2E;--bg:#F7F6FB;--surface:#fff;--tint:#EEEAF8;--accent:#F06A8A;--line:#ddd8ec;--shadow:0 18px 50px rgba(43,34,83,.1);--radius:22px;--radius-sm:14px;--max:1180px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font-family:system-ui,-apple-system,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;line-height:1.75;-webkit-font-smoothing:antialiased}img{max-width:100%;display:block}a{color:inherit;text-decoration:none}button,input{font:inherit}.shell{width:min(calc(100% - 40px),var(--max));margin-inline:auto}.skip-link{position:absolute;left:-999px;top:12px;background:var(--deep);color:#fff;padding:10px 14px;border-radius:8px;z-index:100}.skip-link:focus{left:12px}.site-header{position:sticky;top:0;z-index:30;background:rgba(247,246,251,.92);backdrop-filter:blur(16px);border-bottom:1px solid rgba(221,216,236,.8)}.header-inner{min-height:82px;display:flex;align-items:center;gap:28px}.brand{display:flex;align-items:center;gap:12px;min-width:240px}.brand img{width:46px;height:46px;object-fit:contain;border-radius:12px;background:var(--tint)}.brand span{display:flex;flex-direction:column;line-height:1.25}.brand strong{font-size:19px}.brand small{font-size:12px;color:var(--muted);margin-top:4px}.main-nav{display:flex;align-items:center;gap:6px;margin-left:auto}.main-nav a{padding:9px 12px;border-radius:10px;color:#4f4a5f;font-size:15px}.main-nav a:hover,.main-nav a[aria-current="page"]{background:var(--tint);color:var(--primary)}.menu-toggle{display:none;border:1px solid var(--line);background:#fff;border-radius:10px;padding:8px 12px}.hero{padding:64px 0 44px;background:linear-gradient(180deg,#f7f6fb 0%,#f1eef9 100%)}.hero-grid{display:grid;grid-template-columns:1.08fr .92fr;align-items:center;gap:54px}.hero-copy h1,.page-intro 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img{width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:30px;box-shadow:var(--shadow)}.media-note{position:absolute;left:24px;bottom:22px;padding:10px 14px;background:rgba(30,27,46,.88);color:#fff;border-radius:12px;font-size:14px}.section{padding:72px 0}.section-no-top{padding:20px 0 60px}.section-tint{padding:68px 0;background:var(--tint)}.section-heading{max-width:760px;margin-bottom:30px}.section-heading h2,.article-flow h2,.side-note h2,.device-card h2,.rrys-grid h2,.guide-detail h1{margin:6px 0 12px;line-height:1.2;color:var(--deep)}.section-heading h2{font-size:34px}.section-heading p{color:var(--muted)}.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}.feature-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}.feature-card img{width:100%;aspect-ratio:16/9;object-fit:cover;background:var(--tint)}.feature-card div{padding:22px}.feature-card h3{margin:0 0 8px;font-size:20px}.feature-card p{margin:0;color:var(--muted)}.split{display:grid;grid-template-columns:1fr .85fr;gap:54px;align-items:center}.split h2{font-size:36px;margin:6px 0 14px}.split p{color:#5d5869}.text-link{display:inline-block;margin-top:10px;color:var(--primary);font-weight:750}.checklist{display:grid;grid-template-columns:1fr 1fr;gap:14px}.checklist span{background:#fff;border:1px solid #ded7f4;padding:18px;border-radius:14px;font-weight:700}.link-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}.link-card{display:flex;flex-direction:column;gap:6px;padding:22px;background:#fff;border:1px solid var(--line);border-radius:16px;transition:.2s transform,.2s border-color}.link-card:hover{transform:translateY(-2px);border-color:var(--primary-soft)}.link-card strong{font-size:18px}.link-card span{color:var(--muted)}.faq-list{display:grid;gap:10px}.faq-list details{background:#fff;border:1px solid var(--line);border-radius:14px;padding:0 18px}.faq-list summary{cursor:pointer;padding:17px 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#eeeaf5;color:#5a5366}.side-note a:hover{color:var(--primary)}.side-note img{margin-top:18px;border-radius:12px;aspect-ratio:4/3;object-fit:cover}.number-list{counter-reset:item;list-style:none;padding:0;display:grid;gap:12px}.number-list li{padding:18px 20px;background:#fff;border:1px solid var(--line);border-radius:14px}.callout{margin:32px 0;padding:24px 26px;background:var(--deep);color:#fff;border-radius:20px}.callout h2{color:#fff!important;margin-top:0}.callout p{color:#d9d3e7!important}.device-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin:12px 0 66px}.device-card{background:#fff;border:1px solid var(--line);border-radius:20px;padding:24px}.device-card h2{font-size:23px}.device-card ul{padding-left:20px;color:var(--muted)}.device-card li{margin:10px 0}.device-index{display:inline-block;background:var(--tint);color:var(--primary);padding:5px 9px;border-radius:8px;font-size:11px;font-weight:800;letter-spacing:.08em}.rrys-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}.rrys-grid article{padding:24px;background:#fff;border:1px solid var(--line);border-radius:18px}.rrys-grid h2{font-size:22px}.rrys-grid p{margin-bottom:0;color:var(--muted)}.guide-list{display:grid;grid-template-columns:repeat(2,1fr);gap:18px;margin:10px 0 40px}.guide-list a{padding:24px;background:#fff;border:1px solid var(--line);border-radius:18px}.guide-list a:hover{border-color:var(--primary-soft)}.guide-list span{color:var(--primary);font-size:12px;font-weight:800}.guide-list h2{font-size:22px;margin:8px 0}.guide-list p{color:var(--muted);margin:0}.guide-detail{max-width:820px;margin:38px auto 70px}.guide-detail h1{font-size:44px}.lead{font-size:19px;color:var(--muted)}.guide-steps{list-style:none;padding:0;margin:34px 0;display:grid;gap:14px}.guide-steps li{display:grid;grid-template-columns:42px 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h2{font-size:29px}.page-intro{padding-top:20px}.content-layout{gap:28px}.guide-detail h1{font-size:36px}.error-panel{padding:32px 22px}.actions .button{width:100%}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}
\n/* Long-form reading refinements */\n.article-flow blockquote{margin:28px 0;padding:18px 22px;border-left:4px solid var(--primary);background:#fff;border-radius:0 14px 14px 0;color:#5a5465}.article-flow table{width:100%;border-collapse:collapse;margin:26px 0;background:#fff;border-radius:14px;overflow:hidden}.article-flow th,.article-flow td{padding:13px 15px;border-bottom:1px solid var(--line);text-align:left}.article-flow th{background:var(--tint);color:var(--deep)}.article-flow code{padding:2px 6px;border-radius:6px;background:var(--tint);font-size:.92em}.article-flow ul,.article-flow ol{padding-left:1.4em}.article-flow li{margin:.45em 0}.article-flow hr{border:0;border-top:1px solid var(--line);margin:38px 0}.article-flow strong{color:var(--deep)}.article-flow .muted{color:var(--muted)}.article-flow .notice{padding:18px 20px;border-radius:14px;background:#fff6f8;border:1px solid #f6cbd5}.article-flow .notice strong{color:#a33d58}.article-flow .info{padding:18px 20px;border-radius:14px;background:#f3f0ff;border:1px solid #d9d0ff}.article-flow .info strong{color:var(--primary)}\n.guide-deep{margin:42px 0;display:grid;gap:18px}.guide-deep section{padding:24px 26px;background:#fff;border:1px solid var(--line);border-radius:18px}.guide-deep h2{font-size:24px;margin:0 0 10px;color:var(--deep)}.guide-deep p{margin:0;color:#575161}.issue-table-wrap,.compare-wrap{overflow:auto;margin:24px 0 38px;border:1px solid var(--line);border-radius:16px;background:#fff}.issue-table,.compare-wrap table{width:100%;min-width:920px;border-collapse:collapse}.issue-table th,.issue-table td,.compare-wrap th,.compare-wrap td{padding:14px 15px;vertical-align:top;text-align:left;border-bottom:1px solid var(--line);border-right:1px solid var(--line)}.issue-table th:last-child,.issue-table td:last-child,.compare-wrap th:last-child,.compare-wrap td:last-child{border-right:0}.issue-table thead th,.compare-wrap thead th{position:sticky;top:0;background:var(--tint);color:var(--deep);z-index:1}.issue-table tbody tr:last-child td,.compare-wrap tbody tr:last-child td,.compare-wrap tbody tr:last-child th{border-bottom:0}.issue-table td:first-child{font-weight:750;color:var(--deep);min-width:180px}.compare-wrap tbody th{background:#fbfaff;min-width:120px;color:var(--deep)}.practice-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:22px 0}.practice-grid article{padding:22px;background:#fff;border:1px solid var(--line);border-radius:16px}.practice-grid h3{font-size:20px;margin:0 0 8px;color:var(--deep)}.practice-grid p{margin:0;color:var(--muted)}@media(max-width:720px){.practice-grid{grid-template-columns:1fr}.issue-table-wrap,.compare-wrap{margin-inline:-4px}.guide-deep section{padding:20px}}
.official-checks,.usage-notes{display:grid;gap:14px;margin:22px 0 36px}.official-checks article,.usage-notes article{padding:20px 22px;background:#fff;border:1px solid var(--line);border-radius:16px}.official-checks h3,.usage-notes h3{margin:0 0 7px;font-size:20px;color:var(--deep)}.official-checks p,.usage-notes p{margin:0;color:var(--muted)}
.rrys-tips{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:22px 0 34px}.rrys-tips article{padding:20px;background:#fff;border:1px solid var(--line);border-radius:15px}.rrys-tips h3{margin:0 0 8px;font-size:19px;color:var(--deep)}.rrys-tips p{margin:0;color:var(--muted)}@media(max-width:720px){.rrys-tips{grid-template-columns:1fr}}
.home-scenarios{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.home-scenarios article{padding:20px;background:#fff;border:1px solid #ded8ef;border-radius:16px}.home-scenarios h3{margin:0 0 8px;font-size:18px;line-height:1.35;color:var(--deep)}.home-scenarios p{margin:0;color:var(--muted);font-size:15px}@media(max-width:980px){.home-scenarios{grid-template-columns:1fr 1fr}}@media(max-width:620px){.home-scenarios{grid-template-columns:1fr}}