*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{--blue:#1a73e8;--blue2:#0d47a1;--sky:#e8f4fd;--coral:#ea4335;--green:#34a853;--yellow:#fbbc04;--dark:#1a1a2e;--gray:#5f6368;--light:#f8f9fa;--white:#fff;--border:#dadce0;--radius:12px;--shadow:0 2px 12px rgba(0,0,0,.1)}
html{scroll-behavior:smooth}
body{font-family:'Segoe UI',Arial,sans-serif;color:var(--dark);background:var(--white);line-height:1.6}
a{color:var(--blue);text-decoration:none}
img{max-width:100%}
@keyframes spin{from{transform:rotate(0deg)}to{transform:rotate(360deg)}}
@keyframes fadeUp{from{opacity:0;transform:translateY(24px)}to{opacity:1;transform:translateY(0)}}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.5}}

/* NAV */
.topnav{position:sticky;top:0;z-index:100;background:var(--white);border-bottom:1px solid var(--border);padding:0 24px}
.nav-inner{max-width:1200px;margin:0 auto;display:flex;align-items:center;height:60px;gap:0}
.brand{font-size:1.2rem;font-weight:700;color:var(--blue);margin-right:auto;display:flex;align-items:center;gap:8px}
.brand svg{flex-shrink:0}
.navlist{display:flex;list-style:none;gap:4px}
.navlist a{padding:8px 16px;border-radius:20px;font-size:.9rem;color:var(--gray);transition:all .2s}
.navlist a:hover{background:var(--sky);color:var(--blue)}
.navlist a.on{background:var(--blue);color:var(--white);font-weight:600}

/* HERO */
.hero{background:linear-gradient(135deg,#1a73e8 0%,#0d47a1 50%,#1a237e 100%);color:var(--white);padding:100px 24px 80px;text-align:center;position:relative;overflow:hidden}
.hero::before{content:'';position:absolute;inset:0;background:url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.04'%3E%3Ccircle cx='30' cy='30' r='20'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");pointer-events:none}
.hero-inner{max-width:800px;margin:0 auto;position:relative;animation:fadeUp .7s ease both}
.hero-badge{display:inline-flex;align-items:center;gap:6px;background:rgba(255,255,255,.15);border:1px solid rgba(255,255,255,.3);border-radius:20px;padding:6px 16px;font-size:.8rem;margin-bottom:24px;backdrop-filter:blur(4px)}
.hero h1{font-size:clamp(2rem,5vw,3.2rem);font-weight:800;line-height:1.2;margin-bottom:20px;letter-spacing:-.02em}
.hero p{font-size:1.15rem;opacity:.9;margin-bottom:36px;max-width:600px;margin-left:auto;margin-right:auto}
.hero-btns{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}
.btn-primary{background:var(--white);color:var(--blue);font-size:1rem;font-weight:700;padding:14px 32px;border-radius:30px;border:none;cursor:pointer;transition:all .2s;display:inline-flex;align-items:center;gap:8px;box-shadow:0 4px 16px rgba(0,0,0,.2)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(0,0,0,.3)}
.btn-outline{background:transparent;color:var(--white);border:2px solid rgba(255,255,255,.6);font-size:1rem;font-weight:600;padding:13px 28px;border-radius:30px;cursor:pointer;transition:all .2s}
.btn-outline:hover{background:rgba(255,255,255,.1)}
.hero-stats{display:flex;justify-content:center;gap:48px;margin-top:56px;flex-wrap:wrap}
.hero-stat{text-align:center}
.hero-stat strong{display:block;font-size:2rem;font-weight:800}
.hero-stat span{font-size:.85rem;opacity:.8}

/* SECTIONS */
.sec{padding:80px 24px}
.sec-alt{background:var(--light)}
.sec-inner{max-width:1200px;margin:0 auto}
.sec-head{text-align:center;margin-bottom:56px}
.sec-label{display:inline-block;background:var(--sky);color:var(--blue);font-size:.8rem;font-weight:700;padding:4px 14px;border-radius:12px;margin-bottom:12px;letter-spacing:.05em;text-transform:uppercase}
.sec-head h2{font-size:clamp(1.6rem,3.5vw,2.4rem);font-weight:800;color:var(--dark);margin-bottom:12px}
.sec-head p{color:var(--gray);max-width:620px;margin:0 auto;font-size:1.05rem}

/* FEATURE CARDS */
.feat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:24px}
.feat-card{background:var(--white);border:1px solid var(--border);border-radius:var(--radius);padding:32px 28px;transition:all .25s}
.feat-card:hover{border-color:var(--blue);box-shadow:0 8px 32px rgba(26,115,232,.12);transform:translateY(-4px)}
.feat-icon{width:52px;height:52px;background:var(--sky);border-radius:14px;display:flex;align-items:center;justify-content:center;margin-bottom:20px}
.feat-card h3{font-size:1.1rem;font-weight:700;margin-bottom:10px;color:var(--dark)}
.feat-card p{color:var(--gray);font-size:.95rem;line-height:1.65}

/* PLATFORMS */
.plat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:20px}
.plat-card{background:var(--white);border:2px solid var(--border);border-radius:var(--radius);padding:28px 24px;text-align:center;transition:all .25s}
.plat-card:hover{border-color:var(--blue);box-shadow:var(--shadow)}
.plat-card.featured{border-color:var(--blue);background:var(--sky)}
.plat-ico{width:60px;height:60px;margin:0 auto 16px;display:flex;align-items:center;justify-content:center}
.plat-card h3{font-size:1.05rem;font-weight:700;margin-bottom:6px}
.plat-card p{color:var(--gray);font-size:.88rem;margin-bottom:18px}
.plat-card button{width:100%}

/* DEEP FEATURES */
.deep-row{display:grid;grid-template-columns:1fr 1fr;gap:64px;align-items:center;margin-bottom:72px}
.deep-row:last-child{margin-bottom:0}
.deep-row.rev{direction:rtl}
.deep-row.rev>*{direction:ltr}
.deep-visual{background:linear-gradient(135deg,var(--sky),#dbeafe);border-radius:20px;height:280px;display:flex;align-items:center;justify-content:center}
.deep-info h3{font-size:1.5rem;font-weight:800;margin-bottom:14px}
.deep-info p{color:var(--gray);line-height:1.7;margin-bottom:14px}
.deep-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px}
.deep-tag{background:var(--sky);color:var(--blue);font-size:.8rem;font-weight:600;padding:4px 12px;border-radius:20px}

/* REVIEWS */
.rev-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:20px}
.rev-card{background:var(--white);border:1px solid var(--border);border-radius:var(--radius);padding:24px}
.rev-head{display:flex;align-items:center;gap:12px;margin-bottom:14px}
.rev-avatar{width:44px;height:44px;border-radius:50%;background:linear-gradient(135deg,var(--blue),var(--coral));display:flex;align-items:center;justify-content:center;color:var(--white);font-weight:700;font-size:.95rem;flex-shrink:0}
.rev-name{font-weight:700;font-size:.95rem}
.rev-stars{color:var(--yellow);font-size:1rem;letter-spacing:1px}
.rev-card p{color:var(--gray);font-size:.92rem;line-height:1.65}

/* STATS BAND */
.stats-band{background:linear-gradient(135deg,var(--blue),var(--blue2));color:var(--white);padding:60px 24px}
.stats-row{max-width:1000px;margin:0 auto;display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:32px;text-align:center}
.stat-num{font-size:2.4rem;font-weight:800;display:block}
.stat-label{font-size:.9rem;opacity:.85}

/* COMPARISON TABLE */
.cmp-wrap{overflow-x:auto}
.cmp-table{width:100%;border-collapse:collapse;font-size:.95rem}
.cmp-table th{background:var(--dark);color:var(--white);padding:14px 18px;text-align:left;font-weight:600}
.cmp-table th:first-child{border-radius:10px 0 0 0}
.cmp-table th:last-child{border-radius:0 10px 0 0}
.cmp-table td{padding:13px 18px;border-bottom:1px solid var(--border)}
.cmp-table tr:nth-child(even) td{background:var(--light)}
.cmp-table tr:hover td{background:var(--sky)}
.cmp-highlight{background:var(--sky)!important;font-weight:700;color:var(--blue)}
.check{color:var(--green);font-weight:700}
.cross{color:#ccc}

/* FAQ */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{border:1px solid var(--border);border-radius:var(--radius);margin-bottom:10px;overflow:hidden}
.faq-q{width:100%;text-align:left;background:var(--white);border:none;padding:18px 20px;font-size:1rem;font-weight:600;cursor:pointer;display:flex;justify-content:space-between;align-items:center;color:var(--dark);transition:background .2s}
.faq-q:hover{background:var(--sky)}
.faq-q.open{background:var(--blue);color:var(--white)}
.faq-chevron{transition:transform .3s;flex-shrink:0}
.faq-q.open .faq-chevron{transform:rotate(180deg)}
.faq-a{display:none;padding:18px 20px;color:var(--gray);line-height:1.7;border-top:1px solid var(--border);font-size:.95rem}
.faq-a.open{display:block}

/* DOWNLOAD PAGE */
.dl-hero{background:linear-gradient(135deg,#0d47a1,#1a73e8);color:var(--white);padding:80px 24px 60px;text-align:center}
.dl-hero h1{font-size:clamp(1.8rem,4vw,2.8rem);font-weight:800;margin-bottom:14px}
.dl-hero p{opacity:.9;font-size:1.05rem;margin-bottom:0}
.dl-main{background:var(--white);border:2px solid var(--blue);border-radius:20px;padding:40px;max-width:700px;margin:0 auto;text-align:center;box-shadow:0 12px 48px rgba(26,115,232,.15)}
.dl-main-icon{margin-bottom:20px}
.dl-main h2{font-size:1.6rem;font-weight:800;margin-bottom:8px}
.dl-meta{display:flex;justify-content:center;gap:24px;flex-wrap:wrap;margin:16px 0 28px;color:var(--gray);font-size:.88rem}
.dl-meta span{display:flex;align-items:center;gap:4px}
.btn-dl{background:var(--blue);color:var(--white);font-size:1.1rem;font-weight:700;padding:16px 40px;border-radius:30px;border:none;cursor:pointer;display:inline-flex;align-items:center;gap:10px;transition:all .2s;box-shadow:0 4px 16px rgba(26,115,232,.35)}
.btn-dl:hover{background:var(--blue2);transform:translateY(-2px);box-shadow:0 8px 28px rgba(26,115,232,.5)}
.plat-other{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:16px;max-width:900px;margin:40px auto 0}
.plat-other .plat-card{padding:22px 18px}
.steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:20px}
.step-card{background:var(--white);border:1px solid var(--border);border-radius:var(--radius);padding:24px 20px;position:relative;text-align:center}
.step-num{width:40px;height:40px;background:var(--blue);color:var(--white);border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:1.1rem;margin:0 auto 14px}
.step-card h4{font-weight:700;margin-bottom:8px;font-size:.95rem}
.step-card p{color:var(--gray);font-size:.88rem}
.req-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px}
.req-card{background:var(--light);border-radius:var(--radius);padding:20px}
.req-card h4{font-weight:700;margin-bottom:10px;display:flex;align-items:center;gap:8px;font-size:.95rem}
.req-card ul{list-style:none;color:var(--gray);font-size:.88rem}
.req-card li{padding:4px 0;border-bottom:1px solid var(--border)}
.req-card li:last-child{border:none}
.ver-list{max-width:700px;margin:0 auto}
.ver-item{background:var(--white);border-left:4px solid var(--blue);padding:20px 24px;margin-bottom:14px;border-radius:0 var(--radius) var(--radius) 0;box-shadow:var(--shadow)}
.ver-top{display:flex;align-items:center;gap:12px;margin-bottom:8px;flex-wrap:wrap}
.ver-tag{background:var(--blue);color:var(--white);font-size:.78rem;font-weight:700;padding:3px 10px;border-radius:10px}
.ver-date{color:var(--gray);font-size:.85rem}
.ver-item p{color:var(--gray);font-size:.9rem;line-height:1.65}
.sec-banner{background:linear-gradient(135deg,#e8f5e9,#c8e6c9);border:1px solid #a5d6a7;border-radius:var(--radius);padding:32px;text-align:center;margin-top:24px}
.sec-banner h3{color:#2e7d32;font-size:1.2rem;margin-bottom:8px;font-weight:700}
.sec-banner p{color:#388e3c;font-size:.92rem}

/* ZH-CN PAGE */
.zh-hero{background:linear-gradient(160deg,var(--dark) 0%,#16213e 100%);color:var(--white);padding:80px 24px 60px;text-align:center}
.zh-hero h1{font-size:clamp(1.8rem,4vw,2.8rem);font-weight:800;margin-bottom:14px}
.zh-hero p{opacity:.85;max-width:660px;margin:0 auto 28px;font-size:1.05rem}
.tag-cloud{display:flex;flex-wrap:wrap;justify-content:center;gap:8px;margin-top:24px}
.tag{background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.2);color:rgba(255,255,255,.9);font-size:.8rem;padding:4px 12px;border-radius:14px}
.article-wrap{max-width:1100px;margin:0 auto;display:grid;grid-template-columns:1fr 320px;gap:48px;align-items:start}
.article-body h2{font-size:1.5rem;font-weight:800;color:var(--dark);margin:36px 0 14px}
.article-body h3{font-size:1.15rem;font-weight:700;color:var(--dark);margin:24px 0 10px}
.article-body p{color:var(--gray);line-height:1.8;margin-bottom:16px;font-size:.97rem}
.article-body h2[id],.article-body h3[id]{scroll-margin-top:90px}
.article-body ul{margin:12px 0 16px 24px;color:var(--gray);font-size:.95rem}
.article-body li{margin-bottom:6px;line-height:1.65}
.article-body .cmp-wrap{margin:24px 0}
.sidebar{position:sticky;top:80px}
.sidebar-box{background:var(--white);border:1px solid var(--border);border-radius:var(--radius);padding:24px;margin-bottom:20px}
.sidebar-box h4{font-weight:700;margin-bottom:16px;font-size:1rem;color:var(--dark);border-bottom:2px solid var(--blue);padding-bottom:8px}
.sidebar-box button,.sidebar-box a.btn-dl{width:100%;margin-bottom:10px;display:block;text-align:center}
.sidebar-stats{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.ss-item{background:var(--sky);border-radius:10px;padding:12px;text-align:center}
.ss-item strong{display:block;font-size:1.2rem;color:var(--blue);font-weight:800}
.ss-item span{font-size:.75rem;color:var(--gray)}
.cta-block{background:linear-gradient(135deg,var(--blue),var(--blue2));color:var(--white);border-radius:20px;padding:48px 36px;text-align:center;margin:48px 0}
.cta-block h2{font-size:1.7rem;font-weight:800;margin-bottom:12px;color:var(--white)}
.cta-block p{opacity:.9;margin-bottom:28px;color:rgba(255,255,255,.92)}
.btn-cta{background:var(--white);color:var(--blue);font-size:1.05rem;font-weight:700;padding:14px 36px;border-radius:30px;text-decoration:none;display:inline-block;transition:all .2s;box-shadow:0 4px 16px rgba(0,0,0,.2)}
.btn-cta:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(0,0,0,.3)}

/* FOOTER */
.site-footer{background:var(--dark);color:#9aa0a6;padding:40px 24px;text-align:center;font-size:.88rem}
.footer-inner{max-width:1000px;margin:0 auto}
.security{color:#81c784;margin-bottom:10px;font-size:.9rem}
.security::before{content:'✅ ';margin-right:2px}

/* RESPONSIVE */
@media(max-width:900px){
  .deep-row{grid-template-columns:1fr}
  .deep-row.rev{direction:ltr}
  .article-wrap{grid-template-columns:1fr}
  .sidebar{position:static}
}
@media(max-width:600px){
  .hero-stats{gap:24px}
  .nav-inner{gap:0}
  .navlist a{padding:6px 10px;font-size:.8rem}
}