:root{--green:#1ed760;--green2:#1db954;--black:#121212;--ink:#171717;--muted:#5c655f;--soft:#f4faf6;--line:#dfe9e2;--white:#fff}
*{box-sizing:border-box}html{scroll-behavior:smooth;overflow-x:hidden}body{margin:0;font-family:Arial,Helvetica,sans-serif;color:var(--ink);background:#fff;line-height:1.68;overflow-x:hidden}img{max-width:100%;height:auto}a{color:#159447;text-decoration:none}.container{width:min(1180px,calc(100% - 34px));margin:auto}
.site-header{background:#121212;color:#fff;border-bottom:1px solid #2a2a2a}.nav{min-height:72px;display:flex;align-items:center;justify-content:space-between;gap:20px}.brand{display:flex;align-items:center;gap:11px;color:#fff;font-weight:900;font-size:20px}.brand img{width:42px;height:42px;border-radius:10px}.menu{display:flex;gap:19px;flex-wrap:wrap}.menu a{color:#fff;font-weight:700;font-size:14px}
.hero{background:linear-gradient(135deg,#121212 0%,#17281d 62%,#143c22 100%);color:#fff;padding:52px 0 44px}.hero-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:36px;align-items:center}.pill{display:inline-flex;padding:7px 12px;border-radius:99px;background:#dff8e8;color:#096d31;font-weight:800;font-size:13px}.hero h1{font-size:clamp(38px,5.2vw,66px);line-height:1.04;margin:17px 0}.hero .lead{color:#dce8df;font-size:18px;max-width:760px}.buttons{display:flex;gap:12px;flex-wrap:wrap;margin-top:24px}.btn{display:inline-flex;align-items:center;justify-content:center;padding:14px 22px;border-radius:999px;background:var(--green);color:#0b1a10;font-weight:900}.btn.alt{background:#fff;color:#111}.app-card{background:#fff;color:#171717;border-radius:24px;padding:24px;box-shadow:0 24px 70px #0006}.app-top{display:flex;align-items:center;gap:15px;margin-bottom:18px}.app-top img{width:86px;height:86px;border-radius:20px}.app-top h2{margin:0;font-size:27px}.info-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px}.info{background:var(--soft);padding:12px;border-radius:13px}.info b{display:block;font-size:12px;color:#66726a}.info span{font-weight:800}.warning{margin-top:24px;padding:15px 17px;background:#fff4cf;color:#57420b;border:1px solid #f0d47d;border-radius:14px;font-size:14px}
main{padding:40px 0}.article{max-width:930px;margin:auto}.toc{border:1px solid var(--line);border-radius:18px;padding:18px 20px;background:#fff;margin-bottom:32px}.toc summary{cursor:pointer;font-weight:900;font-size:18px}.toc-grid{display:grid;grid-template-columns:1fr 1fr;gap:7px 22px;margin-top:14px}.article h2{font-size:clamp(28px,3vw,39px);line-height:1.18;margin:50px 0 17px;padding:15px 18px;background:#f2faf5;border-left:5px solid var(--green2);border-radius:12px}.article h3{font-size:21px;line-height:1.3;margin:26px 0 8px}.article p{margin:0 0 17px}.app-table{width:100%;border-collapse:collapse}.app-table th,.app-table td{padding:13px;border:1px solid var(--line);text-align:left}.app-table th{background:var(--soft);width:34%}.feature-grid{display:grid;grid-template-columns:1fr 1fr;gap:15px}.feature-card{border:1px solid var(--line);border-radius:18px;padding:19px;background:linear-gradient(180deg,#fff,#f8fcf9);box-shadow:0 7px 22px #0d3c1c0c}.feature-card h3{margin:0 0 8px;font-size:19px}.feature-card p{margin:0}.comparison{overflow:auto}.comparison table{width:100%;min-width:720px;border-collapse:collapse}.comparison th,.comparison td{border:1px solid var(--line);padding:12px;text-align:left}.comparison th{background:#edf8f0}.steps{counter-reset:s}.step{position:relative;border:1px solid var(--line);border-radius:16px;padding:17px 18px 17px 62px;margin:13px 0}.step:before{counter-increment:s;content:counter(s);position:absolute;left:17px;top:17px;width:30px;height:30px;border-radius:50%;display:grid;place-items:center;background:var(--green);font-weight:900}.step h3{margin:0 0 6px}.faq{border:1px solid var(--line);border-radius:14px;margin:11px 0}.faq summary{padding:15px 52px 15px 16px;cursor:pointer;font-weight:800;position:relative}.faq summary:after{content:"+";position:absolute;right:15px;top:50%;transform:translateY(-50%);width:29px;height:29px;border-radius:50%;background:var(--soft);display:grid;place-items:center}.faq[open] summary:after{content:"−"}.faq p{padding:0 16px 15px;margin:0}.callout{padding:18px;border-radius:15px;background:#eef9f2;border:1px solid #cfe9d7;margin:18px 0}
footer{background:#121212;color:#d7ddd9;padding:34px 0;margin-top:56px}.footer{display:flex;justify-content:space-between;gap:25px;flex-wrap:wrap}.footer a{color:#fff}
@media(max-width:760px){.container{width:min(100% - 22px,1180px)}.nav{padding:14px 0;align-items:flex-start;flex-direction:column}.menu{gap:9px 14px}.hero{padding:32px 0}.hero-grid{grid-template-columns:1fr}.hero h1{font-size:38px}.app-card{padding:17px}.info-grid{grid-template-columns:1fr 1fr}.toc-grid,.feature-grid{grid-template-columns:1fr}.article{width:100%}.article h2{font-size:27px;margin-top:38px}.buttons,.btn{width:100%}.app-table{font-size:14px}.app-table th,.app-table td{padding:9px}.footer{flex-direction:column}}
@media(max-width:420px){.hero h1{font-size:32px}.info-grid{grid-template-columns:1fr}.menu a{font-size:13px}.app-top img{width:72px;height:72px}}

/* v3 visual enhancement */
.article h2{position:relative;overflow:hidden;background:linear-gradient(100deg,#edf9f1,#fff);border-left:0;padding:18px 22px 18px 27px;box-shadow:0 8px 28px rgba(22,90,44,.07)}
.article h2:before{content:"";position:absolute;left:0;top:0;bottom:0;width:6px;background:linear-gradient(var(--green),var(--green2));border-radius:8px}
.article h2:after{content:"";position:absolute;width:90px;height:90px;border-radius:50%;right:-45px;top:-45px;background:rgba(30,215,96,.08)}
.article h3{position:relative;padding-left:17px}.article h3:before{content:"";position:absolute;left:0;top:.3em;width:5px;height:1.05em;border-radius:5px;background:var(--green)}
.article h4{font-size:17px;margin:20px 0 7px;padding:9px 13px;border-radius:10px;background:#f2faf5;border:1px solid #d9eddf}
.whatsnew-list{display:grid;gap:13px;margin:20px 0}.new-item{display:grid;grid-template-columns:52px 1fr;gap:15px;padding:18px;border:1px solid var(--line);border-radius:18px;background:linear-gradient(135deg,#fff,#f3fbf6);box-shadow:0 9px 26px rgba(17,70,34,.06);transition:transform .2s ease,box-shadow .2s ease}.new-item:hover{transform:translateY(-2px);box-shadow:0 13px 30px rgba(17,70,34,.1)}.new-num{width:46px;height:46px;border-radius:14px;background:#121212;color:var(--green);display:grid;place-items:center;font-weight:900}.new-item h3{margin:0 0 7px;padding-left:0}.new-item h3:before{display:none}.new-item p{margin:0}
.editorial-image{margin:27px auto;padding:12px;background:#121212;border-radius:22px;max-width:560px;box-shadow:0 18px 44px rgba(0,0,0,.18)}.editorial-image img{display:block;width:100%;border-radius:14px}.editorial-image figcaption{color:#d7e0da;font-size:13px;padding:10px 6px 3px;text-align:center}
.review-box{position:relative;border:1px solid #cce8d5;background:linear-gradient(145deg,#f1fbf4,#fff);padding:28px 24px 10px;border-radius:22px;box-shadow:0 12px 34px rgba(13,74,33,.08)}.review-mark{display:inline-block;margin-bottom:14px;background:#121212;color:var(--green);font-weight:900;text-transform:uppercase;letter-spacing:.08em;font-size:12px;padding:7px 12px;border-radius:999px}
.feature-grid{gap:18px}.feature-card{position:relative;overflow:hidden;padding:22px;border:1px solid #d9eade;box-shadow:0 10px 28px rgba(12,65,29,.07);transition:transform .2s ease,box-shadow .2s ease}.feature-card:after{content:"";position:absolute;width:65px;height:65px;border-radius:50%;right:-30px;top:-30px;background:rgba(30,215,96,.10)}.feature-card:hover{transform:translateY(-3px);box-shadow:0 15px 34px rgba(12,65,29,.11)}.feature-card h3{padding-left:0;color:#102b19}.feature-card h3:before{display:none}.feature-card h3:after{content:"";display:block;width:36px;height:3px;background:var(--green);border-radius:5px;margin-top:9px}
.comparison.fixed-table{overflow:visible;width:100%}.fixed-table table{width:100%;min-width:0;table-layout:fixed}.fixed-table th,.fixed-table td{word-break:normal;overflow-wrap:anywhere;padding:11px 8px;font-size:14px;vertical-align:top}.fixed-table th:first-child{width:25%}
@media(max-width:600px){.new-item{grid-template-columns:42px 1fr;padding:14px;gap:11px}.new-num{width:38px;height:38px;border-radius:11px;font-size:13px}.editorial-image{max-width:100%;padding:8px}.fixed-table th,.fixed-table td{font-size:11px;padding:7px 4px;line-height:1.35}.fixed-table th:first-child{width:24%}.article h2{padding:15px 15px 15px 20px}.feature-card{padding:18px}}

/* v4 main hero redesign */
.hero-v4{padding:42px 0 34px;background:radial-gradient(circle at 80% 25%,rgba(96,28,123,.42),transparent 35%),linear-gradient(135deg,#111 0%,#21102d 52%,#171019 100%);overflow:hidden}
.hero-grid-v4{display:grid;grid-template-columns:minmax(0,1.02fr) minmax(330px,.72fr);gap:38px;align-items:center}
.hero-copy{min-width:0}.hero-v4 h1{font-size:clamp(40px,5.1vw,67px);line-height:1.04;letter-spacing:-.035em;margin:17px 0 20px;max-width:780px}.hero-v4 .lead{max-width:720px}
.hero-art{position:relative;display:flex;justify-content:center;align-items:center}.hero-art:before{content:"";position:absolute;inset:8% -8%;background:radial-gradient(circle,rgba(30,215,96,.16),transparent 62%);filter:blur(12px)}
.hero-art img{position:relative;width:min(100%,510px);max-height:720px;object-fit:cover;object-position:top;border-radius:26px;border:1px solid rgba(255,255,255,.15);box-shadow:0 30px 80px rgba(0,0,0,.55)}
.hero-mini{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:9px;margin-top:22px;max-width:640px}.hero-mini span{background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.11);border-radius:12px;padding:10px 12px;color:#e9eee9;font-size:13px}.hero-mini b{color:var(--green);margin-right:5px}
.hero-v4 .warning{background:rgba(255,245,210,.97);margin-top:28px}
@media(max-width:850px){.hero-grid-v4{grid-template-columns:1fr}.hero-copy{text-align:left}.hero-art{order:2}.hero-art img{width:min(100%,600px);max-height:none;object-fit:contain}.hero-v4 h1{font-size:42px}.hero-mini{max-width:none}}
@media(max-width:520px){.hero-v4{padding-top:26px}.hero-v4 h1{font-size:34px;line-height:1.08}.hero-mini{grid-template-columns:1fr 1fr}.hero-art img{border-radius:18px}.hero-grid-v4{gap:24px}}

/* v5 mobile reading padding + back to top */
.scroll-top{position:fixed;right:20px;bottom:20px;z-index:999;width:48px;height:48px;border:0;border-radius:50%;background:#1ed760;color:#0b1710;font-size:25px;font-weight:900;box-shadow:0 10px 28px rgba(0,0,0,.25);cursor:pointer;opacity:0;visibility:hidden;transform:translateY(12px);transition:.22s ease}.scroll-top.show{opacity:1;visibility:visible;transform:none}.scroll-top:hover{transform:translateY(-2px)}
@media(max-width:760px){
  .container{width:100%;padding-left:20px;padding-right:20px;margin-left:auto;margin-right:auto}
  .article{padding-left:20px;padding-right:20px}
  .article.container{padding-left:20px;padding-right:20px}
  .article p,.article li{line-height:1.72}
  .article h2,.article h3,.article h4{max-width:100%}
  .scroll-top{right:15px;bottom:16px;width:46px;height:46px}
}
@media(max-width:380px){
  .container,.article,.article.container{padding-left:17px;padding-right:17px}
}

/* v6: one unique supplied image per feature */
.feature-card{overflow:hidden;padding:0!important;display:flex;flex-direction:column}.feature-media{margin:0;background:linear-gradient(145deg,#0b0b0b,#191919);display:flex;align-items:center;justify-content:center;min-height:330px;border-bottom:1px solid rgba(255,255,255,.08)}.feature-media img{display:block;width:100%;height:430px;object-fit:contain;object-position:center;background:#0d0d0d;image-rendering:auto}.feature-card h3{margin:22px 22px 10px!important}.feature-card p{margin:0 22px 24px!important}.feature-card:hover .feature-media img{transform:scale(1.015)}.feature-media img{transition:transform .25s ease}@media(max-width:760px){.feature-media{min-height:0}.feature-media img{height:auto;max-height:none;width:100%;object-fit:contain}.feature-card h3{margin:18px 18px 9px!important}.feature-card p{margin:0 18px 21px!important}}

/* v8 contextual homepage images */
.contextual-image{margin:22px 0 28px;width:100%;overflow:hidden;border-radius:18px}.contextual-image img{display:block;width:100%;height:auto;max-width:100%;object-fit:contain}.download-guide-image{max-width:980px;margin-left:auto;margin-right:auto}@media(max-width:640px){.contextual-image{margin:16px 0 22px;border-radius:12px}.download-guide-image{max-width:100%}}