:root {
    --primary:#FF4B55;
    --secondary:#5468FF;
    --ink:#172033;
    --muted:#667085;
    --bg:#F7F8FC;
    --card:#fff;
    --line:#e8eaf0;
    --shadow:0 20px 50px rgba(29,39,64,.10)
}
* {
    box-sizing:border-box
}
html {
    scroll-behavior:smooth
}
body {
    margin:0;
    font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Arial,sans-serif;
    color:var(--ink);
    background:#fff;
    line-height:1.75
}
a {
    color:inherit;
    text-decoration:none
}
img {
    max-width:100%;
    display:block
}
.container {
    width:min(1180px,calc(100% - 40px));
    margin:auto
}
.topbar {
    background:#101727;
    color:#d9deea;
    font-size:13px;
    padding:8px 0
}
.topbar .container {
    display:flex;
    justify-content:space-between;
    gap:16px
}
header {
    position:sticky;
    top:0;
    z-index:20;
    background:rgba(255,255,255,.92);
    backdrop-filter:blur(14px);
    border-bottom:1px solid rgba(232,234,240,.9)
}
.nav {
    height:74px;
    display:flex;
    align-items:center;
    justify-content:space-between;
    gap:22px
}
.brand {
    display:flex;
    align-items:center;
    gap:12px;
    font-weight:800;
    font-size:20px
}
.brand img {
    width:42px;
    height:42px
}
.navlinks {
    display:flex;
    gap:26px;
    color:#394056;
    font-size:15px
}
.nav-cta,.btn-primary {
    background:linear-gradient(135deg,var(--primary),#ff6f65);
    color:white;
    border-radius:14px;
    padding:12px 22px;
    font-weight:700;
    box-shadow:0 12px 24px rgba(255,75,85,.22)
}
.btn-secondary {
    background:#fff;
    color:var(--ink);
    border:1px solid var(--line);
    border-radius:14px;
    padding:12px 22px;
    font-weight:700
}
.hero {
    background:radial-gradient(circle at 83% 10%,rgba(84,104,255,.15),transparent 30%),radial-gradient(circle at 20% 10%,rgba(255,75,85,.13),transparent 28%),linear-gradient(180deg,#fff,#f8f9fe);
    padding:74px 0 54px
}
.hero-grid {
    display:grid;
    grid-template-columns:1.05fr .95fr;
    gap:56px;
    align-items:center
}
.eyebrow {
    display:inline-flex;
    gap:8px;
    align-items:center;
    background:#fff0f1;
    color:#cf3540;
    border:1px solid #ffd8dc;
    border-radius:999px;
    padding:7px 12px;
    font-size:13px;
    font-weight:700
}
h1 {
    font-size:58px;
    line-height:1.12;
    margin:18px 0 16px;
    letter-spacing:-2px
}
.hero p {
    font-size:19px;
    color:#586075;
    max-width:660px
}
.actions {
    display:flex;
    gap:14px;
    margin:30px 0 18px;
    flex-wrap:wrap
}
.trust {
    display:flex;
    gap:18px;
    flex-wrap:wrap;
    color:#657087;
    font-size:14px
}
.visual-card {
    background:#101727;
    border-radius:28px;
    padding:14px;
    box-shadow:0 34px 80px rgba(37,49,93,.22);
    transform:rotate(1deg)
}
.visual-card img {
    border-radius:20px;
    background:white
}
.section {
    padding:78px 0
}
.section.alt {
    background:var(--bg)
}
.section-head {
    max-width:760px;
    margin-bottom:36px
}
.section-head h2 {
    font-size:36px;
    line-height:1.3;
    margin:0 0 12px
}
.section-head p {
    color:var(--muted);
    margin:0
}
.grid-4 {
    display:grid;
    grid-template-columns:repeat(4,1fr);
    gap:18px
}
.grid-3 {
    display:grid;
    grid-template-columns:repeat(3,1fr);
    gap:22px
}
.card {
    background:#fff;
    border:1px solid var(--line);
    border-radius:22px;
    padding:24px;
    box-shadow:0 10px 30px rgba(35,42,72,.05)
}
.icon {
    width:48px;
    height:48px;
    border-radius:14px;
    display:grid;
    place-items:center;
    background:linear-gradient(135deg,#fff0f1,#eef0ff);
    font-size:24px;
    margin-bottom:16px
}
.card h3 {
    margin:0 0 8px;
    font-size:19px
}
.card p {
    margin:0;
    color:var(--muted);
    font-size:14px
}
.platforms {
    display:flex;
    gap:12px;
    flex-wrap:wrap
}
.pill {
    border:1px solid var(--line);
    background:#fff;
    border-radius:999px;
    padding:10px 16px;
    font-size:14px
}
.banner {
    background:linear-gradient(135deg,#141b2f,#212c50);
    border-radius:30px;
    padding:46px;
    color:white;
    display:grid;
    grid-template-columns:1.2fr .8fr;
    gap:30px;
    align-items:center
}
.banner p {
    color:#cdd4e7
}
.banner .btn-primary {
    display:inline-block
}
.articles {
    display:grid;
    grid-template-columns:repeat(3,1fr);
    gap:22px
}
.article-card {
    overflow:hidden;
    background:#fff;
    border:1px solid var(--line);
    border-radius:20px
}
.article-card img {
    aspect-ratio:16/9;
    object-fit:cover;
    background:#f2f4fb
}
.article-card .body {
    padding:20px
}
.article-card h3 {
    font-size:18px;
    line-height:1.5;
    margin:0 0 8px
}
.article-card p {
    font-size:14px;
    color:var(--muted);
    margin:0
}
footer {
    background:#101727;
    color:#dbe1ef;
    padding:54px 0 28px
}
footer .foot {
    display:grid;
    grid-template-columns:1.4fr 1fr 1fr;
    gap:30px
}
footer .brand {
    color:white
}
footer p,footer a {
    color:#aeb7ca;
    font-size:14px
}
.copyright {
    border-top:1px solid #28304a;
    margin-top:32px;
    padding-top:22px;
    color:#8993a8;
    font-size:13px
}
.article-hero {
    padding:56px 0 28px;
    background:linear-gradient(180deg,#fafbff,#fff)
}
.breadcrumbs {
    font-size:13px;
    color:#7b8397;
    margin-bottom:18px
}
.article-layout {
    display:grid;
    grid-template-columns:minmax(0,1fr) 300px;
    gap:36px;
    align-items:start
}
article h1 {
    font-size:42px;
    letter-spacing:-1px
}
article h2 {
    font-size:27px;
    margin-top:38px
}
article p {
    font-size:17px;
    color:#384055
}
article .lead {
    font-size:19px;
    color:#566074;
    border-left:4px solid var(--primary);
    padding-left:18px
}
.meta {
    display:flex;
    gap:16px;
    flex-wrap:wrap;
    color:#7a8296;
    font-size:14px;
    margin:16px 0 28px
}
.cover {
    border-radius:24px;
    border:1px solid var(--line);
    margin:22px 0 28px
}
.note {
    background:#fff7f8;
    border:1px solid #ffdadd;
    border-radius:16px;
    padding:18px 20px
}
.steps {
    counter-reset:step;
    display:grid;
    gap:14px
}
.step {
    position:relative;
    padding:18px 18px 18px 58px;
    border:1px solid var(--line);
    border-radius:16px;
    background:#fff
}
.step:before {
    counter-increment:step;
    content:counter(step);
    position:absolute;
    left:16px;
    top:16px;
    width:28px;
    height:28px;
    border-radius:50%;
    display:grid;
    place-items:center;
    background:var(--primary);
    color:white;
    font-weight:700
}
.sidebar {
    position:sticky;
    top:100px
}
.toc a {
    display:block;
    padding:8px 0;
    color:#596277;
    font-size:14px;
    border-bottom:1px dashed #eceef3
}
.source-list a {
    color:#4d5fd7;
    text-decoration:underline
}
.faq details {
    border:1px solid var(--line);
    border-radius:15px;
    padding:16px 18px;
    margin:12px 0;
    background:#fff
}
.faq summary {
    cursor:pointer;
    font-weight:700
}
.disclaimer {
    font-size:13px;
    color:#7b8395
}
.mobile-menu {
    display:none
}
@media(max-width:900px) {
    .hero-grid,.banner,.article-layout {
        grid-template-columns:1fr
    }
    h1 {
        font-size:44px
    }
    .grid-4 {
        grid-template-columns:repeat(2,1fr)
    }
    .grid-3,.articles {
        grid-template-columns:1fr 1fr
    }
    .navlinks {
        display:none
    }
    .sidebar {
        position:static
    }
}
@media(max-width:620px) {
    .container {
        width:min(100% - 24px,1180px)
    }
    h1,article h1 {
        font-size:36px
    }
    .hero {
        padding-top:48px
    }
    .grid-4,.grid-3,.articles {
        grid-template-columns:1fr
    }
    .topbar .container {
        display:block
    }
    footer .foot {
        grid-template-columns:1fr
    }
    .nav-cta {
        padding:10px 14px
    }
}


/* V4 product screenshot presentation: preserve the complete source image. */
.article-card .media {
    height: 250px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    background: linear-gradient(180deg, #f7f9fd 0%, #eef2f8 100%);
    border-bottom: 1px solid var(--line);
}
.article-card .media img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    object-position: center;
    padding: 14px;
    box-sizing: border-box;
    background: transparent;
}
.article-card > img {
    width: 100%;
    height: 250px;
    object-fit: contain !important;
    object-position: center !important;
    padding: 14px;
    box-sizing: border-box;
    background: linear-gradient(180deg, #f7f9fd 0%, #eef2f8 100%) !important;
}
.cover {
    width: 100%;
    max-height: 620px;
    object-fit: contain;
    object-position: center;
    background: #f5f7fb;
    padding: 18px;
    box-sizing: border-box;
}
.visual-card img {
    width: 100%;
    max-height: 560px;
    object-fit: contain;
    background: #ffffff;
}