:root{
  --primary:#f5222d;--primary-dark:#cf1322;--primary-light:#ff4d4f;--primary-rgb:245,34,45;
  --accent:#fa8c16;
  --bg:#141414;--bg-card:#1c1c1e;--bg-card2:#242426;--bg-section:#181818;
  --text:#e8e8e8;--text-sub:#a0a0a0;--text-muted:#505050;
  --border:#2a2a2a;--border-light:#222222;
  --shadow:0 2px 16px rgba(0,0,0,.4);--shadow-md:0 4px 24px rgba(0,0,0,.5);
  --glow:0 8px 32px rgba(245,34,45,.22);
  --nav-h:64px;--radius:10px;--radius-lg:16px;
}
[data-theme=light]{
  --bg:#ffffff;--bg-card:#ffffff;--bg-card2:#fafafa;--bg-section:#f7f8fa;
  --text:#1a1a1a;--text-sub:#434343;--text-muted:#8c8c8c;
  --border:#e8e8e8;--border-light:#f0f0f0;
  --shadow:0 2px 16px rgba(0,0,0,.06);--shadow-md:0 4px 24px rgba(0,0,0,.09);
  --glow:0 8px 32px rgba(245,34,45,.18);
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Segoe UI",sans-serif;background:var(--bg);color:var(--text);line-height:1.6;overflow-x:hidden;transition:background .3s,color .3s}
a{color:inherit;text-decoration:none}
img{display:block;max-width:100%}
ul{list-style:none}
button{cursor:pointer;border:none;background:none;font-family:inherit}
.container{max-width:1180px;margin:0 auto;padding:0 24px}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);border:0}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:7px;padding:10px 24px;border-radius:var(--radius);font-size:.9rem;font-weight:600;border:1.5px solid transparent;transition:all .22s ease;white-space:nowrap;cursor:pointer}
.btn-primary{background:var(--primary);color:#fff;border-color:var(--primary);box-shadow:0 2px 10px rgba(var(--primary-rgb),.28)}
.btn-primary:hover{background:var(--primary-dark);border-color:var(--primary-dark);transform:translateY(-1px);box-shadow:0 4px 18px rgba(var(--primary-rgb),.38)}
.btn-ghost{background:transparent;color:var(--text);border-color:var(--border)}
.btn-ghost:hover{border-color:var(--primary);color:var(--primary)}
.btn-outline{background:transparent;color:var(--primary);border-color:var(--primary)}
.btn-outline:hover{background:var(--primary);color:#fff}
.btn-lg{padding:13px 32px;font-size:1rem;border-radius:var(--radius-lg)}

nav{position:fixed;top:0;left:0;right:0;height:var(--nav-h);background:rgba(20,20,20,.9);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-bottom:1px solid var(--border-light);z-index:900;transition:background .3s,box-shadow .3s}
[data-theme=light] nav{background:rgba(255,255,255,.88)}
nav.scrolled{box-shadow:var(--shadow)}
.nav-inner{max-width:1180px;margin:0 auto;padding:0 24px;height:100%;display:flex;align-items:center;justify-content:space-between;gap:16px}
.nav-logo{display:flex;align-items:center;gap:9px;font-size:1.05rem;font-weight:700;color:var(--text);flex-shrink:0}
.nav-logo img{width:30px;height:30px;border-radius:7px;object-fit:cover}
.nav-logo .brand{color:var(--primary)}
.nav-links{display:flex;align-items:center;gap:2px;padding:0}
.nav-links a{padding:6px 14px;border-radius:8px;font-size:.875rem;color:var(--text-muted);transition:color .2s,background .2s}
.nav-links a:hover{color:var(--text);background:var(--bg-card2)}
.nav-right{display:flex;align-items:center;gap:8px}
.nav-right .btn{padding:7px 18px;font-size:.85rem}
.theme-btn{width:34px;height:34px;border-radius:8px;display:flex;align-items:center;justify-content:center;color:var(--text-muted);border:1.5px solid var(--border);transition:background .2s,color .2s}
.theme-btn:hover{background:var(--bg-card2);color:var(--text)}
.theme-btn .icon-moon{display:block}
.theme-btn .icon-sun{display:none}
[data-theme=light] .theme-btn .icon-moon{display:none}
[data-theme=light] .theme-btn .icon-sun{display:block}
.nav-toggle{display:none;flex-direction:column;gap:5px;width:34px;height:34px;align-items:center;justify-content:center;border-radius:8px;color:var(--text-muted)}
.nav-toggle span{display:block;width:19px;height:1.5px;background:currentColor;border-radius:2px;transition:all .3s}
.nav-toggle.open span:nth-child(1){transform:translateY(6.5px) rotate(45deg)}
.nav-toggle.open span:nth-child(2){opacity:0;transform:scaleX(0)}
.nav-toggle.open span:nth-child(3){transform:translateY(-6.5px) rotate(-45deg)}
.mobile-nav{display:none;flex-direction:column;position:fixed;top:var(--nav-h);left:0;right:0;background:var(--bg);border-bottom:1px solid var(--border);padding:12px 24px 20px;z-index:899;opacity:0;transform:translateY(-8px);pointer-events:none;transition:opacity .25s,transform .25s}
.mobile-nav.open{opacity:1;transform:none;pointer-events:all;display:flex}
.mobile-nav a{padding:13px 0;font-size:.95rem;color:var(--text);border-bottom:1px solid var(--border-light)}
.mob-actions{display:flex;flex-direction:column;gap:9px;margin-top:14px}
.mob-actions .btn{justify-content:center}

#hero{min-height:100vh;display:flex;align-items:center;position:relative;overflow:hidden;padding-top:var(--nav-h)}
.hero-bg-img{position:absolute;inset:0;background:url('../img/hero-bg.png') center/cover no-repeat;opacity:.18;pointer-events:none}
[data-theme=light] .hero-bg-img{opacity:.06}
.hero-glow-a{position:absolute;top:-15%;right:-10%;width:55vw;height:55vw;background:radial-gradient(circle,rgba(var(--primary-rgb),.14) 0%,transparent 68%);pointer-events:none}
[data-theme=light] .hero-glow-a{background:radial-gradient(circle,rgba(var(--primary-rgb),.07) 0%,transparent 68%)}
.hero-glow-b{position:absolute;bottom:-5%;left:-8%;width:40vw;height:40vw;background:radial-gradient(circle,rgba(var(--primary-rgb),.07) 0%,transparent 65%);pointer-events:none}
.hero-inner{position:relative;z-index:2;padding:80px 0 100px;text-align:center;width:100%;display:flex;flex-direction:column;align-items:center}
.hero-badge{display:inline-flex;align-items:center;gap:8px;background:rgba(var(--primary-rgb),.1);border:1px solid rgba(var(--primary-rgb),.2);padding:5px 14px;border-radius:100px;font-size:.8rem;color:var(--primary);font-weight:600;margin-bottom:28px;animation:fadeUp .6s ease both}
.badge-dot{width:6px;height:6px;border-radius:50%;background:var(--primary);animation:pulse 2s infinite;flex-shrink:0}
.hero-inner h1{font-size:clamp(2.3rem,6.5vw,4rem);font-weight:800;line-height:1.1;letter-spacing:-.03em;max-width:820px;margin-bottom:22px;animation:fadeUp .7s .08s ease both;text-wrap:balance}
.hero-inner h1 .hl{color:var(--primary);position:relative}
.hero-inner h1 .hl::after{content:'';position:absolute;bottom:2px;left:0;right:0;height:3px;background:linear-gradient(90deg,var(--primary),var(--accent));border-radius:2px;opacity:.45}
.hero-desc{font-size:clamp(1rem,2vw,1.15rem);color:var(--text-muted);max-width:560px;line-height:1.8;margin-bottom:38px;animation:fadeUp .7s .16s ease both}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap;justify-content:center;animation:fadeUp .7s .24s ease both}
.hero-divider{width:100%;max-width:820px;border:none;border-top:1px solid var(--border-light);margin:56px 0 48px;animation:fadeUp .7s .3s ease both}
.hero-stats{display:flex;gap:56px;flex-wrap:wrap;justify-content:center;animation:fadeUp .7s .36s ease both}
.stat{text-align:center}
.stat strong{display:block;font-size:clamp(1.8rem,3.5vw,2.6rem);font-weight:800;color:var(--text);line-height:1.1}
.stat span{font-size:.82rem;color:var(--text-muted);margin-top:4px;display:block}

section{padding:92px 0}
.sec-alt{background:var(--bg-section)}
.sec-head{text-align:center;margin-bottom:56px}
.sec-tag{display:inline-block;padding:4px 12px;border-radius:100px;background:rgba(var(--primary-rgb),.1);color:var(--primary);font-size:.78rem;font-weight:700;letter-spacing:.07em;text-transform:uppercase;margin-bottom:12px}
.sec-head h2{font-size:clamp(1.7rem,3.5vw,2.4rem);font-weight:700;letter-spacing:-.025em;color:var(--text);margin-bottom:12px;text-wrap:balance}
.sec-head h2 em{color:var(--primary);font-style:normal}
.sec-head p{font-size:.95rem;color:var(--text-muted);max-width:520px;margin:0 auto;line-height:1.75}

.features-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.feat-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);padding:32px;transition:transform .25s,box-shadow .25s,border-color .25s;position:relative;overflow:hidden}
.feat-card::before{content:'';position:absolute;inset:0 0 auto;height:2px;background:linear-gradient(90deg,var(--primary),var(--accent));opacity:0;transition:opacity .25s}
.feat-card:hover{transform:translateY(-4px);box-shadow:var(--glow);border-color:rgba(var(--primary-rgb),.3)}
.feat-card:hover::before{opacity:1}
.feat-icon{width:50px;height:50px;border-radius:12px;background:rgba(var(--primary-rgb),.1);border:1px solid rgba(var(--primary-rgb),.18);display:flex;align-items:center;justify-content:center;color:var(--primary);margin-bottom:18px}
.feat-card h3{font-size:1rem;font-weight:700;margin-bottom:8px;color:var(--text)}
.feat-card p{font-size:.875rem;color:var(--text-muted);line-height:1.75}

.nodes-map-img{width:100%;border-radius:var(--radius-lg);overflow:hidden;margin-bottom:36px}
.nodes-map-img img{width:100%;height:auto;border-radius:var(--radius-lg)}
.nodes-list{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;padding:0}
.node-badge{display:inline-flex;align-items:center;gap:8px;background:var(--bg-card);border:1px solid var(--border);border-radius:8px;padding:9px 16px;font-size:.875rem;font-weight:500;transition:all .2s;color:var(--text-sub)}
.node-badge:hover{border-color:var(--primary);color:var(--primary)}
.nd{width:7px;height:7px;border-radius:50%;flex-shrink:0}
.nd.on{background:#52c41a;box-shadow:0 0 6px rgba(82,196,26,.5)}
.nd.mid{background:var(--accent);box-shadow:0 0 6px rgba(250,140,22,.4)}
.nd.new{background:var(--primary);box-shadow:0 0 6px rgba(var(--primary-rgb),.5);animation:pulse 2.5s infinite}

.pricing-row{display:flex;align-items:center;justify-content:center;gap:14px;margin-bottom:48px;font-size:.875rem;color:var(--text-muted)}
.price-label{font-weight:500;transition:color .2s}
.price-label.on{color:var(--text);font-weight:600}
.toggle-wrap{position:relative;width:46px;height:24px;background:var(--border);border-radius:100px;cursor:pointer;transition:background .3s;flex-shrink:0}
.toggle-wrap.yearly{background:var(--primary)}
.toggle-knob{position:absolute;top:3px;left:3px;width:18px;height:18px;background:#fff;border-radius:50%;transition:transform .3s;box-shadow:0 1px 4px rgba(0,0,0,.3)}
.toggle-wrap.yearly .toggle-knob{transform:translateX(22px)}
.save-tag{background:rgba(var(--primary-rgb),.12);color:var(--primary);font-size:.73rem;font-weight:700;padding:3px 9px;border-radius:5px}
.pricing-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;max-width:960px;margin:0 auto}
.plan{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);padding:34px;transition:all .25s;position:relative}
.plan:hover{transform:translateY(-4px);box-shadow:var(--shadow-md)}
.plan.pop{border-color:var(--primary);box-shadow:var(--glow)}
.pop-badge{position:absolute;top:-13px;left:50%;transform:translateX(-50%);background:var(--primary);color:#fff;font-size:.72rem;font-weight:700;padding:4px 14px;border-radius:100px;letter-spacing:.06em;white-space:nowrap}
.plan-tier{font-size:.78rem;font-weight:700;color:var(--text-muted);text-transform:uppercase;letter-spacing:.1em;margin-bottom:8px}
.plan-amt{display:flex;align-items:baseline;gap:3px;margin-bottom:6px}
.plan-amt sup{font-size:.95rem;font-weight:700;color:var(--text-sub);margin-top:8px}
.plan-amt strong{font-size:2.8rem;font-weight:800;line-height:1;color:var(--text)}
.plan-amt .plan-period{font-size:.85rem;color:var(--text-muted)}
.plan-orig{font-size:.82rem;color:var(--text-muted);margin-bottom:22px}
.plan-orig del{opacity:.6}
.plan-sep{border:none;border-top:1px solid var(--border-light);margin:22px 0}
.plan-items{display:flex;flex-direction:column;gap:11px;margin-bottom:28px;padding:0}
.plan-items li{display:flex;align-items:flex-start;gap:10px;font-size:.875rem;color:var(--text-sub)}
.plan-items li::before{content:"✓";color:var(--primary);font-weight:700;flex-shrink:0;margin-top:1px}
.plan-items li.dim{color:var(--text-muted)}
.plan-items li.dim::before{content:"·";color:var(--text-muted)}
.plan .btn{width:100%;justify-content:center}

.dl-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.dl-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);padding:28px 20px;display:flex;flex-direction:column;align-items:center;gap:12px;text-align:center;transition:all .25s}
.dl-card:hover{border-color:var(--primary);transform:translateY(-3px);box-shadow:var(--glow)}
.dl-icon{width:56px;height:56px;border-radius:15px;display:flex;align-items:center;justify-content:center;background:var(--bg-card2);color:var(--primary)}
.dl-name{font-size:.95rem;font-weight:700;color:var(--text)}
.dl-note{font-size:.78rem;color:var(--text-muted)}
.dl-btn{display:inline-flex;align-items:center;gap:6px;padding:7px 16px;border-radius:7px;font-size:.82rem;font-weight:600;background:rgba(var(--primary-rgb),.1);color:var(--primary);border:1px solid rgba(var(--primary-rgb),.22);transition:all .2s}
.dl-btn:hover{background:var(--primary);color:#fff;border-color:var(--primary)}

.reviews-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.review{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);padding:26px;display:flex;flex-direction:column;gap:14px}
.review-stars{color:var(--accent);font-size:.85rem;letter-spacing:2px}
.review > p{font-size:.875rem;color:var(--text-sub);line-height:1.75;flex:1}
.reviewer{display:flex;align-items:center;gap:11px}
.reviewer-av{width:36px;height:36px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--accent));display:flex;align-items:center;justify-content:center;font-size:.85rem;font-weight:700;color:#fff;flex-shrink:0}
.reviewer strong{display:block;font-size:.875rem;font-weight:600;color:var(--text)}
.reviewer span{font-size:.78rem;color:var(--text-muted)}

.faq-list{max-width:740px;margin:0 auto;display:flex;flex-direction:column;gap:10px;padding:0}
.faq-item{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;transition:border-color .2s}
.faq-item.open{border-color:rgba(var(--primary-rgb),.35)}
.faq-q{width:100%;display:flex;align-items:center;justify-content:space-between;padding:18px 22px;background:transparent;border:none;color:var(--text);font-size:.9rem;font-weight:600;text-align:left;cursor:pointer;gap:14px}
.faq-q:hover{background:var(--bg-card2)}
.faq-plus{flex-shrink:0;width:22px;height:22px;border:1.5px solid var(--border);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:1rem;line-height:1;color:var(--text-muted);transition:all .3s}
.faq-item.open .faq-plus{background:var(--primary);border-color:var(--primary);color:#fff;transform:rotate(45deg)}
.faq-a{display:none;padding:0 22px 18px;font-size:.875rem;color:var(--text-muted);line-height:1.8}
.faq-item.open .faq-a{display:block}

#cta{padding:0 0 92px}
.cta-wrap{background:linear-gradient(135deg,#1a0005,#2a000a 50%,#1a0005);border-radius:20px;padding:72px 40px;text-align:center;position:relative;overflow:hidden}
[data-theme=light] .cta-wrap{background:linear-gradient(135deg,#1a0005,#2a000a 50%,#1a0005)}
.cta-wrap::before{content:'';position:absolute;top:-30%;left:50%;transform:translateX(-50%);width:500px;height:500px;background:radial-gradient(circle,rgba(var(--primary-rgb),.22),transparent 65%);pointer-events:none}
.cta-wrap h2{font-size:clamp(1.7rem,3.5vw,2.4rem);font-weight:700;color:#fff;margin-bottom:14px;position:relative}
.cta-wrap p{color:rgba(255,255,255,.55);font-size:.95rem;max-width:480px;margin:0 auto 34px;line-height:1.75;position:relative}
.cta-acts{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;position:relative}
.cta-note{font-size:.78rem;color:rgba(255,255,255,.3);margin-top:18px;position:relative}

footer{border-top:1px solid var(--border-light);padding:52px 0 28px}
.foot-top{display:flex;justify-content:space-between;gap:40px;margin-bottom:40px;flex-wrap:wrap}
.foot-brand p{font-size:.85rem;color:var(--text-muted);max-width:260px;line-height:1.75;margin-top:10px}
.foot-col h4{font-size:.82rem;font-weight:700;color:var(--text);margin-bottom:14px;letter-spacing:.04em;text-transform:uppercase}
.foot-col ul{padding:0;display:flex;flex-direction:column;gap:10px}
.foot-col a{font-size:.85rem;color:var(--text-muted);transition:color .2s}
.foot-col a:hover{color:var(--primary)}
.foot-bottom{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:10px;padding-top:24px;border-top:1px solid var(--border-light)}
.foot-copy{font-size:.8rem;color:var(--text-muted)}
.foot-links{display:flex;gap:20px}
.foot-links a{font-size:.8rem;color:var(--text-muted);transition:color .2s}
.foot-links a:hover{color:var(--text)}

.fade-up{opacity:0;transform:translateY(26px);transition:opacity .6s ease,transform .6s ease}
.fade-up.visible{opacity:1;transform:none}
.fade-up.d1{transition-delay:.06s}.fade-up.d2{transition-delay:.12s}.fade-up.d3{transition-delay:.18s}
.fade-up.d4{transition-delay:.24s}.fade-up.d5{transition-delay:.30s}.fade-up.d6{transition-delay:.36s}

@keyframes fadeUp{from{opacity:0;transform:translateY(22px)}to{opacity:1;transform:none}}
@keyframes pulse{0%,100%{opacity:1;transform:scale(1)}50%{opacity:.5;transform:scale(.82)}}

@media(max-width:1024px){
  .features-grid{grid-template-columns:repeat(2,1fr)}
  .pricing-grid{grid-template-columns:repeat(2,1fr)}
  .reviews-grid{grid-template-columns:repeat(2,1fr)}
  .dl-grid{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:768px){
  .nav-links,.nav-right .btn-ghost{display:none}
  .nav-toggle{display:flex}
  .features-grid,.pricing-grid,.reviews-grid{grid-template-columns:1fr}
  .hero-stats{gap:28px}
  .foot-top{flex-direction:column;gap:28px}
  .foot-bottom{flex-direction:column;text-align:center}
  .foot-links{justify-content:center}
  .cta-wrap{padding:48px 24px}
  section{padding:70px 0}
}
@media(max-width:480px){
  .container{padding:0 16px}
  .hero-actions{flex-direction:column;align-items:stretch}
  .hero-actions .btn{justify-content:center}
  .dl-grid{grid-template-columns:1fr}
  .hero-stats{gap:20px;justify-content:space-around}
  .cta-acts{flex-direction:column;align-items:center}
  .cta-acts .btn{width:100%;max-width:280px;justify-content:center}
  #cta{padding:0 16px 70px}
}