:root{--ink:#17232e;--muted:#65727d;--line:#dfe5e9;--soft:#f5f7f8;--panel:#fff;--accent:#253542;--accent2:#536575;--max:1120px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--ink);background:#fff;line-height:1.65}a{color:inherit;text-decoration:none}img{max-width:100%;display:block}.wrap{width:min(var(--max),calc(100% - 40px));margin:auto}.topbar{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.94);backdrop-filter:blur(12px);border-bottom:1px solid rgba(223,229,233,.8)}.nav{height:72px;display:flex;align-items:center;justify-content:space-between;gap:24px}.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:18px}.brand img{width:38px;height:38px}.navlinks{display:flex;gap:22px;font-size:13px;color:#4d5b66}.navlinks a:hover{color:#111d27}.navbtn,.hero-btn,.dark-btn{display:inline-flex;align-items:center;justify-content:center;gap:9px;background:var(--accent);color:#fff;padding:12px 18px;border-radius:11px;font-weight:750;font-size:14px;box-shadow:0 7px 18px rgba(23,35,46,.12)}.navbtn{padding:10px 15px}.hero{padding:76px 0 78px;background:linear-gradient(180deg,#f6f8f9 0,#fff 100%);overflow:hidden}.hero-grid{display:grid;grid-template-columns:1fr 1.05fr;gap:54px;align-items:center}.eyebrow{display:inline-flex;align-items:center;gap:8px;background:#e9eef1;border:1px solid #dce3e7;color:#34434e;border-radius:999px;padding:5px 11px;font-size:12px;font-weight:800}.hero h1{font-size:clamp(42px,5vw,66px);line-height:1.03;letter-spacing:-2.5px;margin:18px 0 17px}.hero p{font-size:18px;color:#52616d;max-width:600px;margin:0 0 25px}.hero-actions{display:flex;gap:12px;flex-wrap:wrap}.ghost-btn{display:inline-flex;align-items:center;gap:9px;border:1px solid var(--line);background:#fff;padding:12px 17px;border-radius:11px;font-weight:750}.hero-points{display:flex;gap:16px;flex-wrap:wrap;margin-top:25px;color:#586671;font-size:12px}.hero-points span:before{content:'✓';display:inline-grid;place-items:center;width:18px;height:18px;margin-right:6px;border-radius:50%;background:#e9eef1;color:#34434e;font-weight:900}.hero-art{position:relative}.hero-art:after{content:"";position:absolute;inset:10% -10% -8% 5%;background:#edf2f5;border-radius:50%;z-index:0;filter:blur(8px)}.hero-art img{position:relative;z-index:1;border:1px solid #d8e0e5;border-radius:15px;box-shadow:0 22px 55px rgba(37,53,66,.14)}section{padding:86px 0}.section-head{text-align:center;max-width:720px;margin:0 auto 40px}.kicker{text-transform:uppercase;letter-spacing:1.8px;font-size:11px;font-weight:900;color:#71808b}.section-head h2{font-size:36px;letter-spacing:-1.2px;line-height:1.15;margin:9px 0 12px}.section-head p{color:var(--muted);margin:0}.features{background:#fff}.feature-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.card{border:1px solid var(--line);border-radius:13px;padding:22px;background:#fff;transition:.2s}.card:hover{transform:translateY(-2px);box-shadow:0 12px 28px rgba(23,35,46,.07)}.icon{width:38px;height:38px;border-radius:11px;background:#edf1f4;display:grid;place-items:center;margin-bottom:15px;color:#263643;font-weight:900}.card h3{font-size:16px;margin:0 0 7px}.card p{font-size:13px;color:var(--muted);margin:0}.split{background:#f7f9fa}.split-grid{display:grid;grid-template-columns:1fr 1fr;gap:55px;align-items:center}.split h2{font-size:34px;line-height:1.15;letter-spacing:-1px;margin:10px 0 14px}.split p{color:var(--muted)}.checks{padding:0;margin:22px 0 0;list-style:none}.checks li{margin:10px 0;color:#455560;font-size:14px}.checks li:before{content:'✓';display:inline-grid;place-items:center;width:22px;height:22px;border:1px solid #cbd5db;border-radius:50%;margin-right:9px;font-weight:900}.mock{border:1px solid var(--line);background:#fff;border-radius:15px;padding:13px;box-shadow:0 20px 45px rgba(23,35,46,.08)}.mock .bar{height:30px;background:#f0f3f5;border-radius:8px;margin-bottom:10px}.mock .rows{display:grid;gap:7px}.mock .row{height:24px;border-radius:6px;background:#edf1f3}.mock .row:nth-child(2),.mock .row:nth-child(5){width:82%;margin-left:5%}.mock .row:nth-child(3),.mock .row:nth-child(6){width:72%;margin-left:10%}.use-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}.use{border-top:2px solid #d8e0e5;padding-top:18px}.use h3{margin:0 0 7px;font-size:17px}.use p{margin:0;color:var(--muted);font-size:13px}.steps{background:#f7f9fa}.step-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.step{background:#fff;border:1px solid var(--line);border-radius:13px;padding:22px}.num{font-size:12px;font-weight:900;color:#667580}.step h3{margin:7px 0}.download-band{padding:36px 0}.download-box{border:1px solid var(--line);background:#f2f5f7;border-radius:15px;padding:28px;display:flex;align-items:center;justify-content:space-between;gap:25px}.download-box h2{margin:0 0 5px;font-size:25px}.download-box p{margin:0;color:var(--muted);font-size:14px}.faq-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;align-items:start}.faq{border:1px solid var(--line);border-radius:11px;padding:16px 20px;align-self:start}.faq summary{cursor:pointer;font-weight:750}.faq p{color:var(--muted);font-size:13px;margin:12px 0 0}.requirements{background:#f7f9fa}.req-grid{display:grid;grid-template-columns:1fr 1fr;gap:25px}.req-box{background:#fff;border:1px solid var(--line);border-radius:14px;padding:25px}.req-box ul{padding-left:18px;color:var(--muted)}footer{background:#eef2f4;border-top:1px solid #dde4e8;padding:34px 0 18px}.foot-grid{display:grid;grid-template-columns:1.4fr repeat(3,1fr);gap:28px}.foot-brand p{color:#697780;font-size:13px;max-width:290px}.foot-col h4{font-size:13px;margin:0 0 10px}.foot-col a{display:block;color:#64727c;font-size:13px;margin:7px 0}.copyright{border-top:1px solid #d6dfe4;margin-top:24px;padding-top:14px;color:#71808a;font-size:12px;display:flex;justify-content:space-between;gap:15px}.legal{padding:75px 0}.legal h1{font-size:44px;letter-spacing:-1.5px}.legal h2{font-size:24px;margin-top:34px}.legal p,.legal li{color:#5e6d78}.mobile-menu{display:none}.tag{font-size:11px;font-weight:800;background:#edf1f3;padding:4px 8px;border-radius:6px;color:#52616d}.page-hero{padding:65px 0;background:#f5f7f8;border-bottom:1px solid var(--line)}.page-hero h1{font-size:48px;letter-spacing:-1.8px;margin:0 0 8px}.page-hero p{color:var(--muted);max-width:700px}.toc{border:1px solid var(--line);border-radius:13px;padding:20px;background:#fff}.toc a{display:block;color:#53636f;margin:7px 0}.small{font-size:12px;color:#7a8790}
@media(max-width:900px){.navlinks{display:none}.mobile-menu{display:block}.hero-grid,.split-grid,.req-grid{grid-template-columns:1fr}.hero{padding-top:52px}.feature-grid{grid-template-columns:repeat(2,1fr)}.use-grid{grid-template-columns:repeat(2,1fr)}.step-grid{grid-template-columns:1fr}.foot-grid{grid-template-columns:1fr 1fr}.copyright{flex-direction:column}.hero-art{order:-1}.hero-art img{max-height:330px;object-fit:cover;object-position:top}}
@media(max-width:560px){.wrap{width:min(100% - 28px,var(--max))}.nav{height:62px}.navbtn{font-size:12px;padding:9px 12px}.brand{font-size:15px}.brand img{width:32px}.hero h1{font-size:43px}.hero p{font-size:16px}.feature-grid,.use-grid,.faq-grid,.foot-grid{grid-template-columns:1fr}.hero-actions>*{width:100%}.section-head h2,.split h2{font-size:30px}.download-box{align-items:flex-start;flex-direction:column}.page-hero h1{font-size:38px}section{padding:62px 0}}

/* Expanded guide and contrast system */
:root{--blue:#2d6cdf;--blue-soft:#eaf1ff;--accent:#17232e;--accent2:#2d6cdf;--soft:#f4f7fa}
.topbar{box-shadow:0 1px 0 rgba(23,35,46,.03)}.navlinks a:hover{color:var(--blue)}.hero-btn,.dark-btn{background:#17232e}.ghost-btn:hover{border-color:#b8c7e5;background:#f7faff}.hero-points span:before{background:var(--blue-soft);color:var(--blue)}
.feature-image{width:100%;border:1px solid var(--line);border-radius:16px;box-shadow:0 18px 45px rgba(23,35,46,.08);background:#fff}.three-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.info-card{border:1px solid var(--line);border-radius:15px;background:#fff;overflow:hidden}.info-card img{width:100%;aspect-ratio:1.5;object-fit:cover}.info-card h3,.info-card p{margin-left:20px;margin-right:20px}.info-card h3{margin-top:18px;margin-bottom:7px}.info-card p{margin-bottom:22px;color:var(--muted);font-size:13px}.soft-band{background:#f4f7fa}.centered{text-align:center}.centered p{max-width:650px;margin:0 auto 22px;color:var(--muted)}.guide-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.guide-card{border:1px solid var(--line);border-radius:15px;background:#fff;overflow:hidden;transition:.2s}.guide-card:hover{transform:translateY(-3px);box-shadow:0 14px 35px rgba(23,35,46,.08)}.guide-card>img{width:100%;aspect-ratio:1.5;object-fit:cover}.guide-card-body{padding:21px}.guide-label{font-size:10px;text-transform:uppercase;letter-spacing:1.3px;font-weight:900;color:#5f6e79}.guide-card h3{font-size:19px;line-height:1.25;margin:8px 0}.guide-card p{font-size:13px;color:var(--muted);margin:0 0 16px}.text-link{color:var(--blue);font-weight:800;font-size:13px}.center-link{text-align:center;margin-top:28px}.article-hero{padding:68px 0;background:linear-gradient(180deg,#f3f6f8,#fff)}.article-grid{display:grid;grid-template-columns:1fr .9fr;gap:55px;align-items:center}.article-grid h1{font-size:48px;line-height:1.08;letter-spacing:-1.8px;margin:14px 0}.article-grid p{font-size:17px;color:var(--muted);max-width:650px}.article-grid>img{width:100%;border-radius:16px;border:1px solid var(--line);box-shadow:0 20px 50px rgba(23,35,46,.1)}.article{padding:72px 0}.article-layout{display:grid;grid-template-columns:minmax(0,760px) 300px;gap:45px;align-items:start}.article-main section{padding:0 0 26px;margin:0 0 28px;border-bottom:1px solid #edf0f2}.article-main h2{font-size:28px;line-height:1.2;margin:0 0 10px}.article-main p{color:#5d6c77;font-size:15px}.article-note{background:#eef4ff;border:1px solid #d7e4ff;border-radius:13px;padding:18px;color:#4e6070;font-size:13px}.side-card{position:sticky;top:90px;border:1px solid var(--line);border-radius:14px;padding:20px;background:#fff}.side-card h3{margin:8px 0 12px;font-size:17px}.side-card>a:not(.side-download){display:flex;justify-content:space-between;gap:10px;padding:9px 0;border-top:1px solid #edf0f2;color:#566671;font-size:12px}.side-download{width:100%;margin-top:14px}.page-hero{background:linear-gradient(180deg,#f3f6f8,#fff)}.legal h1{margin-top:0}.legal h2{color:#253542}.legal a{color:var(--blue)}
@media(max-width:900px){.three-grid,.guide-grid{grid-template-columns:1fr 1fr}.article-grid,.article-layout{grid-template-columns:1fr}.article-grid>img{max-width:680px}.side-card{position:static}.article-grid h1{font-size:42px}}@media(max-width:560px){.three-grid,.guide-grid{grid-template-columns:1fr}.article-grid h1{font-size:37px}.article-grid p{font-size:16px}.article{padding:55px 0}.article-main h2{font-size:24px}}

/* v3 refinements */
body{font-size:16px}
.navlinks{gap:20px}
.navlinks a{white-space:nowrap}
.foot-col a{display:block;width:max-content;max-width:100%;margin:0 0 7px;padding:0;color:#64727c;font-size:13px;line-height:1.35}.foot-col a:hover{color:var(--blue);text-decoration:underline;text-underline-offset:3px}
.foot-col{min-width:0}
.card p,.use p,.guide-card p{font-size:14px;line-height:1.7}
.section-head h2{font-size:39px}
.split p,.article-main p{font-size:16px;line-height:1.8}
.article-main h2{font-size:30px}
.feature-image{width:100%;border:1px solid var(--line);border-radius:15px;box-shadow:0 18px 40px rgba(23,35,46,.08)}
.insight-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.insight{border:1px solid var(--line);border-radius:14px;padding:24px;background:#fff}
.insight h3{margin:0 0 8px;font-size:18px}
.insight p{margin:0;color:var(--muted);font-size:14px;line-height:1.7}
.band-grid{display:grid;grid-template-columns:1fr 1fr;gap:22px}
.band-card{border:1px solid var(--line);border-radius:15px;padding:26px;background:#fff}
.band-card h3{margin:0 0 8px;font-size:20px}
.band-card p{margin:0;color:var(--muted);font-size:14px;line-height:1.75}
.guide-card-body p{min-height:78px}
@media(max-width:900px){.insight-grid,.band-grid{grid-template-columns:1fr 1fr}}
@media(max-width:560px){.insight-grid,.band-grid{grid-template-columns:1fr}.section-head h2{font-size:32px}.split p,.article-main p{font-size:15.5px}.guide-card-body p{min-height:0}}

/* Final performance, mobile navigation and accessibility refinements */
.mobile-menu{border:1px solid var(--line);background:#fff;color:var(--ink);border-radius:9px;padding:7px 9px;font-size:18px;line-height:1;cursor:pointer;display:none}
.mobile-nav{display:none}
.faq summary{list-style:none;display:flex;align-items:center;justify-content:space-between;gap:16px}
.faq summary::-webkit-details-marker{display:none}
.faq summary:after{content:'+';font-size:20px;line-height:1;color:#61717d;font-weight:700}
.faq[open] summary:after{content:'−'}
.faq[open]{border-color:#cdd9e4;box-shadow:0 8px 22px rgba(23,35,46,.045)}
.skip-link{position:absolute;left:-9999px;top:8px;z-index:100;background:#17232e;color:#fff;padding:8px 12px;border-radius:8px}
.skip-link:focus{left:8px}
@media(max-width:900px){.mobile-menu{display:inline-flex;align-items:center;justify-content:center}.topbar .nav{position:relative}.navlinks.mobile-open{display:flex;position:absolute;left:0;right:0;top:62px;background:#fff;border:1px solid var(--line);border-top:0;padding:12px 14px;flex-direction:column;gap:0;box-shadow:0 15px 30px rgba(23,35,46,.08);border-radius:0 0 12px 12px}.navlinks.mobile-open a{padding:10px 2px;border-bottom:1px solid #edf0f2}.navlinks.mobile-open a:last-child{border-bottom:0}.hero-art img{height:auto;max-height:none;object-fit:contain}}
@media(max-width:560px){.faq{padding:16px}.faq summary{font-size:15px}.hero-art{order:0}}