:root{--primary:#0e3a6b;--primary-2:#13539a;--accent:#00c389;--accent-2:#00a574;--dark:#0b1220;--dark-2:#111b30;--ink:#1c2433;--muted:#5b6675;--line:#e5eaf0;--bg:#f6f8fb;--card:#ffffff;--warn:#ffb020;--danger:#e5484d;--radius:14px;--shadow:0 10px 30px rgba(14,58,107,.08);--shadow-lg:0 24px 60px rgba(14,58,107,.14)}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:"PingFang SC","Microsoft YaHei","Segoe UI",system-ui,-apple-system,sans-serif;color:var(--ink);background:var(--bg);line-height:1.7;font-size:16px}
img{max-width:100%;height:auto;display:block}
a{color:var(--primary);text-decoration:none;transition:color .2s}
a:hover{color:var(--accent-2)}
.container{max-width:1180px;margin:0 auto;padding:0 20px}
.section{padding:64px 0}
.section--alt{background:#fff}
.section--dark{background:var(--dark);color:#eef2f7}
.sec-head{text-align:center;margin-bottom:40px}
.sec-head .eyebrow{display:inline-block;font-size:13px;letter-spacing:2px;color:var(--accent-2);font-weight:700;text-transform:uppercase;margin-bottom:8px}
.sec-head h2{font-size:30px;line-height:1.3;color:var(--ink);margin-bottom:12px}
.section--dark .sec-head h2{color:#fff}
.sec-head p{color:var(--muted);max-width:680px;margin:0 auto;font-size:16px}
.grid{display:grid;gap:22px}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
@media(max-width:900px){.grid-4{grid-template-columns:repeat(2,1fr)}.grid-3{grid-template-columns:repeat(2,1fr)}.grid-2{grid-template-columns:1fr}}
@media(max-width:560px){.grid-4,.grid-3{grid-template-columns:1fr}}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font-weight:700;border-radius:10px;padding:13px 26px;font-size:15px;cursor:pointer;border:2px solid transparent}
.btn--primary{background:var(--accent);color:#06231a}
.btn--primary:hover{background:var(--accent-2);color:#fff}
.btn--dark{background:var(--primary);color:#fff}
.btn--dark:hover{background:var(--primary-2);color:#fff}
.btn--ghost{background:transparent;border-color:var(--line);color:var(--ink)}
.btn--ghost:hover{border-color:var(--accent);color:var(--accent-2)}
.btn--lg{padding:16px 34px;font-size:17px}
.btn--white{background:#fff;color:var(--primary)}
.btn--white:hover{background:#eef2f7;color:var(--primary-2)}

/* header */
.site-header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.96);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;height:66px}
.brand{display:flex;align-items:center;gap:10px;font-size:21px;font-weight:800;color:var(--primary)}
.brand img{width:34px;height:34px;border-radius:8px}
.brand .brand-tag{font-size:11px;background:var(--accent);color:#06231a;padding:1px 7px;border-radius:20px;font-weight:700}
.nav-links{display:flex;align-items:center;gap:24px;list-style:none}
.nav-links a{color:var(--ink);font-weight:600;font-size:15px}
.nav-links a:hover{color:var(--accent-2)}
.nav-cta{margin-left:8px}
@media(max-width:860px){.nav-links{display:none}}

/* hero */
.hero{background:linear-gradient(135deg,#0b2a52 0%,#0e3a6b 55%,#0f4d83 100%);color:#fff;padding:64px 0 80px;overflow:hidden}
.hero .container{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center}
@media(max-width:900px){.hero .container{grid-template-columns:1fr}}
.hero h1{font-size:40px;line-height:1.25;margin:14px 0 18px;font-weight:800}
.hero h1 .hl{color:var(--accent)}
.hero .lead{color:#cfe0f2;font-size:18px;margin-bottom:26px;max-width:540px}
.hero-badges{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:26px}
.pill{background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.18);color:#eaf3fc;padding:6px 14px;border-radius:30px;font-size:13px}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap}
.hero-stats{display:flex;gap:32px;margin-top:32px;flex-wrap:wrap}
.hero-stats .num{font-size:28px;font-weight:800;color:var(--accent)}
.hero-stats .lbl{font-size:13px;color:#a9c2dd}

/* client simulator */
.simulator{background:#0a1426;border:1px solid rgba(255,255,255,.12);border-radius:18px;box-shadow:var(--shadow-lg);overflow:hidden}
.sim-head{display:flex;align-items:center;gap:8px;padding:12px 16px;background:#111d33;border-bottom:1px solid rgba(255,255,255,.08)}
.sim-dot{width:11px;height:11px;border-radius:50%}
.sim-dot.r{background:#ff5f57}.sim-dot.y{background:#febc2e}.sim-dot.g{background:#28c840}
.sim-title{margin-left:8px;font-size:13px;color:#8fa3bf;flex:1}
.sim-body{padding:22px}
.sim-status{display:flex;align-items:center;justify-content:space-between;background:linear-gradient(90deg,#0b2a52,#0e3a6b);border-radius:12px;padding:16px 18px;margin-bottom:18px}
.sim-status .connected{display:flex;align-items:center;gap:10px;font-weight:700}
.sim-status .ping{font-size:13px;color:#9fe8cf}
.sim-ring{width:46px;height:46px;border-radius:50%;background:var(--accent);display:flex;align-items:center;justify-content:center;color:#06231a;font-weight:800;font-size:15px;box-shadow:0 0 0 8px rgba(0,195,137,.15)}
.sim-list{display:flex;flex-direction:column;gap:10px}
.sim-item{display:flex;align-items:center;gap:12px;background:#0e1830;border-radius:10px;padding:11px 14px;border:1px solid rgba(255,255,255,.06)}
.sim-item .flag{width:26px;height:26px;border-radius:50%;background:rgba(255,255,255,.12);display:flex;align-items:center;justify-content:center;font-size:13px}
.sim-item .meta{flex:1}
.sim-item .meta b{display:block;font-size:14px;color:#eef2f7}
.sim-item .meta span{font-size:12px;color:#7d90ad}
.sim-item .spd{font-size:12px;color:#9fe8cf;font-weight:700}

/* cards */
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:26px;box-shadow:var(--shadow);transition:transform .2s,box-shadow .2s}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg)}
.card .icon{width:52px;height:52px;border-radius:12px;background:rgba(0,195,137,.12);color:var(--accent-2);display:flex;align-items:center;justify-content:center;font-size:24px;margin-bottom:16px}
.card h3{font-size:18px;margin-bottom:10px;color:var(--ink)}
.card p{color:var(--muted);font-size:15px}

/* comparison table */
.cmp-wrap{overflow-x:auto}
.cmp-table{width:100%;border-collapse:collapse;background:#fff;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);min-width:640px}
.cmp-table th,.cmp-table td{padding:16px 18px;text-align:center;border-bottom:1px solid var(--line);font-size:14px}
.cmp-table thead th{background:var(--primary);color:#fff;font-weight:700}
.cmp-table thead th.hl-col{background:var(--accent);color:#06231a}
.cmp-table td:first-child,.cmp-table th:first-child{text-align:left;font-weight:600}
.cmp-table .yes{color:var(--accent-2);font-weight:700}
.cmp-table .no{color:var(--danger)}
.cmp-table tbody tr:nth-child(even){background:#fafcfe}
.cmp-table tbody tr:hover{background:#f1f7f4}

/* tabs (news) */
.tabs{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin-bottom:28px}
.tab{display:inline-block;padding:9px 22px;border-radius:30px;background:#fff;border:1px solid var(--line);color:var(--ink);font-weight:600;font-size:14px}
.tab.active,.tab:hover{background:var(--primary);color:#fff;border-color:var(--primary)}
.news-card{display:flex;flex-direction:column;background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:transform .2s}
.news-card:hover{transform:translateY(-4px)}
.news-card .thumb{aspect-ratio:16/9;background:linear-gradient(135deg,#0e3a6b,#00a574);display:flex;align-items:center;justify-content:center;color:#fff;font-size:40px}
.news-card .nc-body{padding:18px}
.news-card .nc-meta{font-size:12px;color:var(--muted);margin-bottom:8px}
.news-card h3{font-size:16px;line-height:1.4;margin-bottom:8px}
.news-card h3 a{color:var(--ink)}
.news-card h3 a:hover{color:var(--accent-2)}
.news-card p{font-size:13px;color:var(--muted)}

/* reviews */
.review{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow)}
.review .stars{color:#ffb020;font-size:15px;letter-spacing:2px;margin-bottom:10px}
.review p{font-size:15px;color:var(--ink);margin-bottom:14px}
.review .who{display:flex;align-items:center;gap:10px}
.review .avatar{width:40px;height:40px;border-radius:50%;background:linear-gradient(135deg,#0e3a6b,#00c389);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700}
.review .who b{display:block;font-size:14px}
.review .who span{font-size:12px;color:var(--muted)}

/* download platforms */
.dl-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px;text-align:center;box-shadow:var(--shadow);transition:transform .2s}
.dl-card:hover{transform:translateY(-4px)}
.dl-card .plat{width:60px;height:60px;margin:0 auto 14px;border-radius:16px;background:rgba(14,58,107,.08);display:flex;align-items:center;justify-content:center;font-size:28px}
.dl-card h3{font-size:17px;margin-bottom:6px}
.dl-card p{font-size:13px;color:var(--muted);margin-bottom:16px}
.dl-card .btn{width:100%}

/* trust */
.trust{display:flex;flex-wrap:wrap;gap:14px;justify-content:center}
.trust-badge{display:flex;align-items:center;gap:8px;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.14);padding:10px 18px;border-radius:30px;font-size:14px;color:#d7e5f4}

/* FAQ */
.faq-item{background:#fff;border:1px solid var(--line);border-radius:12px;margin-bottom:12px;overflow:hidden}
.faq-item summary{padding:18px 20px;font-weight:700;font-size:16px;cursor:pointer;list-style:none;display:flex;justify-content:space-between;align-items:center;color:var(--ink)}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:"+";font-size:22px;color:var(--accent-2);font-weight:700}
.faq-item[open] summary::after{content:"–"}
.faq-body{padding:4px 20px 20px;color:var(--muted);font-size:15px}
.faq-body ol{padding-left:20px;margin:10px 0}
.faq-body li{margin-bottom:8px}

/* breadcrumbs */
.crumbs{font-size:13px;color:var(--muted);padding:16px 0;border-bottom:1px solid var(--line);margin-bottom:0}
.crumbs a{color:var(--primary)}
.crumbs .sep{margin:0 8px;color:#c3ccd8}

/* article */
.article-layout{display:grid;grid-template-columns:1fr 300px;gap:36px;align-items:start}
@media(max-width:900px){.article-layout{grid-template-columns:1fr}}
.article{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:36px;box-shadow:var(--shadow)}
.article h1{font-size:28px;line-height:1.35;margin:10px 0 14px}
.article .a-meta{font-size:13px;color:var(--muted);margin-bottom:20px;display:flex;gap:14px;flex-wrap:wrap}
.article h2{font-size:21px;margin:28px 0 12px;padding-left:12px;border-left:4px solid var(--accent);color:var(--ink)}
.article h3{font-size:17px;margin:20px 0 10px}
.article p{margin-bottom:14px;color:#333d4d;font-size:15.5px}
.article figure{margin:20px 0}
.article figcaption{font-size:12px;color:var(--muted);text-align:center;margin-top:8px}
.article table{width:100%;border-collapse:collapse;margin:18px 0}
.article table th,.article table td{border:1px solid var(--line);padding:10px 12px;font-size:13.5px;text-align:left}
.article table th{background:var(--primary);color:#fff}
.article blockquote{border-left:4px solid var(--accent);background:#f4fbf8;padding:14px 18px;margin:18px 0;color:#26483c;border-radius:0 8px 8px 0}
.article .toc{background:#f6f8fb;border:1px solid var(--line);border-radius:10px;padding:18px 20px;margin-bottom:22px}
.article .toc b{display:block;margin-bottom:8px}
.article .toc ol{padding-left:20px;font-size:14px}
.article .toc a{color:var(--primary)}
.sidebar .side-box{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:20px;margin-bottom:20px;box-shadow:var(--shadow)}
.side-box h3{font-size:16px;margin-bottom:12px;padding-bottom:10px;border-bottom:2px solid var(--accent)}
.side-box ul{list-style:none}
.side-box li{padding:8px 0;border-bottom:1px dashed var(--line);font-size:14px}
.side-box li:last-child{border-bottom:none}
.side-box li a{color:var(--ink)}
.side-box li a:hover{color:var(--accent-2)}
.pager{display:flex;justify-content:space-between;gap:12px;margin-top:24px}
.pager a{flex:1;background:#fff;border:1px solid var(--line);border-radius:10px;padding:14px 16px;font-size:13px;color:var(--ink)}
.pager a:hover{border-color:var(--accent);color:var(--accent-2)}

/* comments */
.comment{border-top:1px solid var(--line);padding:16px 0}
.comment .c-head{display:flex;align-items:center;gap:10px;margin-bottom:8px}
.comment .c-avatar{width:34px;height:34px;border-radius:50%;background:linear-gradient(135deg,#0e3a6b,#00c389);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:13px}
.comment b{font-size:14px;display:block}
.comment span{font-size:12px;color:var(--muted)}
.comment p{font-size:14px;color:#3a4556;margin:0}

/* cta */
.cta{background:linear-gradient(135deg,#0b2a52,#0e3a6b);border-radius:20px;padding:50px 40px;text-align:center;color:#fff}
.cta h2{font-size:28px;margin-bottom:12px}
.cta p{color:#cfe0f2;margin-bottom:24px;font-size:16px}
.cta .btn{margin:0 6px}

/* footer */
.site-footer{background:var(--dark);color:#9fb2c8;padding:56px 0 28px;margin-top:0}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:32px;margin-bottom:36px}
@media(max-width:860px){.footer-grid{grid-template-columns:1fr 1fr}}
@media(max-width:560px){.footer-grid{grid-template-columns:1fr}}
.site-footer h4{color:#fff;font-size:15px;margin-bottom:16px}
.site-footer .f-brand{font-size:20px;font-weight:800;color:#fff;display:flex;align-items:center;gap:10px;margin-bottom:12px}
.site-footer .f-brand img{width:28px;height:28px;border-radius:6px}
.site-footer p{font-size:13.5px}
.site-footer ul{list-style:none}
.site-footer ul li{margin-bottom:10px}
.site-footer ul a{color:#9fb2c8;font-size:13.5px}
.site-footer ul a:hover{color:#fff}
.friend-links{display:flex;flex-wrap:wrap;gap:8px 16px;padding:16px 0;border-top:1px solid rgba(255,255,255,.08);border-bottom:1px solid rgba(255,255,255,.08);margin-bottom:20px}
.friend-links a{color:#7d90ad;font-size:12.5px}
.friend-links a:hover{color:#fff}
.copyright{text-align:center;font-size:12.5px;color:#6b7f98}
.copyright a{color:#9fb2c8}

/* misc */
.hero-img svg{width:100%;height:auto}
.icon-emoji{font-size:26px}
.center{text-align:center}
.mt-20{margin-top:20px}
.mt-40{margin-top:40px}
.announce{background:linear-gradient(90deg,#00a574,#00c389);color:#06231a;text-align:center;padding:9px 16px;font-size:14px;font-weight:600}
.announce a{color:#06231a;text-decoration:underline}
.back-top{position:fixed;right:24px;bottom:24px;width:44px;height:44px;border-radius:50%;background:var(--primary);color:#fff;display:flex;align-items:center;justify-content:center;font-size:20px;box-shadow:var(--shadow-lg);z-index:90}
.back-top:hover{background:var(--accent-2)}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}