*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:'Inter','PingFang SC','Microsoft YaHei',sans-serif;color:#1a1a2e;background:#fff;line-height:1.6;-webkit-font-smoothing:antialiased}
a{text-decoration:none;color:inherit}
ul{list-style:none}
img{max-width:100%;height:auto;display:block}
button{cursor:pointer;border:none;background:none;font-family:inherit}

:root{
  --blue:#1a6ef5;
  --blue-dark:#0d4cc7;
  --blue-light:#e8f0fe;
  --text:#1a1a2e;
  --text-muted:#6b7280;
  --border:#e5e7eb;
  --bg-section:#f8faff;
  --white:#ffffff;
  --radius:12px;
  --shadow:0 4px 24px rgba(26,110,245,.10);
}

.container{max-width:1200px;margin:0 auto;padding:0 24px}
.btn-primary{display:inline-flex;align-items:center;gap:8px;background:var(--blue);color:#fff;padding:12px 28px;border-radius:50px;font-size:15px;font-weight:600;transition:background .2s,transform .15s,box-shadow .2s}
.btn-primary:hover{background:var(--blue-dark);transform:translateY(-2px);box-shadow:0 8px 24px rgba(26,110,245,.35)}
.btn-outline{display:inline-flex;align-items:center;gap:8px;border:2px solid rgba(255,255,255,.55);color:#fff;padding:11px 26px;border-radius:50px;font-size:15px;font-weight:600;transition:border-color .2s,background .2s,transform .15s}
.btn-outline:hover{border-color:#fff;background:rgba(255,255,255,.12);transform:translateY(-2px)}
.section-tag{display:inline-block;font-size:13px;font-weight:600;color:var(--blue);background:var(--blue-light);padding:4px 14px;border-radius:50px;margin-bottom:12px;letter-spacing:.04em}
.section-title{font-size:clamp(26px,4vw,40px);font-weight:800;color:var(--text);line-height:1.25;margin-bottom:14px}
.section-desc{font-size:16px;color:var(--text-muted);max-width:560px}

/* -------- 顶部公告栏 -------- */
#topbar{background:linear-gradient(90deg,var(--blue-dark),var(--blue));color:#fff;text-align:center;padding:10px 16px;font-size:13.5px;position:relative;z-index:100}
#topbar strong{font-weight:700}
#topbar-close{position:absolute;right:16px;top:50%;transform:translateY(-50%);color:rgba(255,255,255,.75);font-size:18px;line-height:1;cursor:pointer;transition:color .2s}
#topbar-close:hover{color:#fff}

/* -------- 导航 -------- */
#navbar{position:sticky;top:0;z-index:99;background:rgba(255,255,255,.95);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--border);transition:box-shadow .3s}
#navbar.scrolled{box-shadow:0 2px 20px rgba(0,0,0,.08)}
.nav-inner{display:flex;align-items:center;height:68px;gap:32px}
.nav-logo{display:flex;align-items:center;gap:10px;font-size:18px;font-weight:800;color:var(--blue);flex-shrink:0}
.nav-logo img{width:36px;height:36px;border-radius:8px}
.nav-links{display:flex;align-items:center;gap:4px;margin-left:auto}
.nav-links a{font-size:14.5px;font-weight:500;color:var(--text-muted);padding:6px 14px;border-radius:8px;transition:color .2s,background .2s}
.nav-links a:hover,.nav-links a.active{color:var(--blue);background:var(--blue-light)}
.nav-actions{display:flex;align-items:center;gap:10px;margin-left:16px}
.nav-btn-login{font-size:14px;font-weight:600;color:var(--text-muted);padding:7px 16px;border-radius:8px;transition:color .2s}
.nav-btn-login:hover{color:var(--blue)}
.nav-btn-dl{display:inline-flex;align-items:center;gap:6px;background:var(--blue);color:#fff;padding:8px 20px;border-radius:50px;font-size:14px;font-weight:600;transition:background .2s,box-shadow .2s}
.nav-btn-dl:hover{background:var(--blue-dark);box-shadow:0 4px 16px rgba(26,110,245,.3)}
.nav-hamburger{display:none;flex-direction:column;gap:5px;cursor:pointer;padding:4px}
.nav-hamburger span{display:block;width:22px;height:2px;background:var(--text);border-radius:2px;transition:transform .3s,opacity .3s}
.nav-hamburger.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-hamburger.open span:nth-child(2){opacity:0}
.nav-hamburger.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* -------- Hero -------- */
#hero{background:linear-gradient(135deg,#0a2a6e 0%,var(--blue) 55%,#2196f3 100%);color:#fff;padding:80px 0 60px;overflow:hidden;position:relative}
#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='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");pointer-events:none}
.hero-inner{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center}
.hero-badge{display:inline-flex;align-items:center;gap:8px;background:rgba(255,255,255,.15);border:1px solid rgba(255,255,255,.25);padding:6px 14px;border-radius:50px;font-size:13px;font-weight:500;margin-bottom:20px;backdrop-filter:blur(8px)}
.hero-badge img{width:18px;height:18px;border-radius:4px}
.hero-title{font-size:clamp(32px,5vw,52px);font-weight:900;line-height:1.15;margin-bottom:18px;letter-spacing:-.02em}
.hero-title span{color:#7dd3fc}
.hero-sub{font-size:16px;line-height:1.7;opacity:.88;max-width:480px;margin-bottom:32px}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-bottom:40px}
.hero-stats{display:flex;gap:32px}
.hero-stat strong{display:block;font-size:28px;font-weight:900}
.hero-stat strong span{font-size:18px;font-weight:700}
.hero-stat small{font-size:13px;opacity:.75;font-weight:500}
.hero-img-wrap{position:relative;display:flex;justify-content:center;align-items:center}
.hero-img-wrap img{width:100%;max-width:520px;filter:drop-shadow(0 20px 60px rgba(0,0,0,.35));animation:float 5s ease-in-out infinite}
@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-12px)}}

/* -------- 下载平台条 -------- */
#download-bar{background:#0d1b3e;padding:20px 0}
.dl-bar-inner{display:flex;align-items:center;gap:24px;flex-wrap:wrap}
.dl-bar-label{color:rgba(255,255,255,.55);font-size:13px;font-weight:600;white-space:nowrap;padding-right:8px;border-right:1px solid rgba(255,255,255,.15)}
.dl-links{display:flex;flex-wrap:wrap;gap:10px}
.dl-link{display:inline-flex;align-items:center;gap:7px;color:rgba(255,255,255,.82);font-size:13.5px;font-weight:500;padding:8px 16px;border-radius:8px;border:1px solid rgba(255,255,255,.15);transition:border-color .2s,color .2s,background .2s}
.dl-link:hover{border-color:rgba(255,255,255,.5);color:#fff;background:rgba(255,255,255,.08)}
.dl-link .ico{font-size:16px}
.dl-link.disabled{opacity:.45;pointer-events:none}

/* -------- 信任标签 -------- */
#trust-bar{padding:28px 0;border-bottom:1px solid var(--border)}
.trust-list{display:flex;flex-wrap:wrap;justify-content:center;gap:32px}
.trust-item{display:flex;align-items:center;gap:8px;font-size:14px;font-weight:500;color:var(--text-muted)}
.trust-icon{width:20px;height:20px;color:var(--blue)}

/* -------- 核心功能 -------- */
#features{padding:90px 0;background:var(--bg-section)}
.features-header{text-align:center;margin-bottom:56px}
.features-header .section-desc{margin:0 auto}
.features-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.feature-card{background:#fff;border-radius:var(--radius);padding:32px 28px;border:1px solid var(--border);transition:box-shadow .25s,transform .25s}
.feature-card:hover{box-shadow:var(--shadow);transform:translateY(-4px)}
.feature-icon{width:48px;height:48px;background:var(--blue-light);border-radius:12px;display:flex;align-items:center;justify-content:center;margin-bottom:18px}
.feature-icon svg{width:24px;height:24px;color:var(--blue)}
.feature-card h3{font-size:17px;font-weight:700;margin-bottom:8px;color:var(--text)}
.feature-card p{font-size:14.5px;color:var(--text-muted);line-height:1.65}

/* -------- 功能详情 -------- */
#feature-detail{padding:90px 0}
.detail-block{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center;margin-bottom:80px}
.detail-block:last-child{margin-bottom:0}
.detail-block.reverse{direction:rtl}
.detail-block.reverse>*{direction:ltr}
.detail-tag{display:inline-block;font-size:12px;font-weight:700;color:var(--blue);text-transform:uppercase;letter-spacing:.08em;margin-bottom:12px}
.detail-block h3{font-size:clamp(22px,3vw,32px);font-weight:800;line-height:1.25;margin-bottom:14px;color:var(--text)}
.detail-block p{font-size:15.5px;color:var(--text-muted);line-height:1.7;margin-bottom:24px}
.detail-list{display:flex;flex-direction:column;gap:12px}
.detail-list li{display:flex;align-items:flex-start;gap:10px;font-size:15px;color:var(--text-muted)}
.detail-list li::before{content:'';display:block;width:20px;height:20px;min-width:20px;background:url("data:image/svg+xml,%3Csvg viewBox='0 0 20 20' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Ccircle cx='10' cy='10' r='10' fill='%231a6ef5'/%3E%3Cpath d='M6 10l3 3 5-5' stroke='white' stroke-width='1.8' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center/contain no-repeat;margin-top:2px}
.detail-img{border-radius:16px;overflow:hidden;box-shadow:0 16px 64px rgba(26,110,245,.15)}
.detail-img img{width:100%;height:auto}

/* -------- 全球节点 -------- */
#nodes{padding:90px 0;background:var(--bg-section)}
.nodes-header{text-align:center;margin-bottom:16px}
.nodes-stats{display:flex;justify-content:center;gap:48px;margin-bottom:48px}
.node-stat strong{display:block;font-size:36px;font-weight:900;color:var(--blue)}
.node-stat span{font-size:14px;color:var(--text-muted);font-weight:500}
.nodes-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.node-card{background:#fff;border-radius:var(--radius);padding:20px 18px;border:1px solid var(--border);display:flex;align-items:center;gap:14px;transition:box-shadow .2s,transform .2s}
.node-card:hover{box-shadow:var(--shadow);transform:translateY(-3px)}
.flag{width:36px;height:36px;border-radius:50%;font-size:22px;display:flex;align-items:center;justify-content:center;background:var(--bg-section);flex-shrink:0}
.node-info strong{display:block;font-size:15px;font-weight:700;color:var(--text)}
.node-info small{font-size:13px;color:var(--text-muted)}

/* -------- 多平台下载 -------- */
#platforms{padding:90px 0}
.platforms-header{text-align:center;margin-bottom:48px}
.platforms-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:16px}
.platform-card{background:var(--bg-section);border-radius:var(--radius);padding:28px 20px;text-align:center;border:1px solid var(--border);transition:box-shadow .2s,transform .2s,border-color .2s;cursor:pointer}
.platform-card:hover:not(.disabled){box-shadow:var(--shadow);transform:translateY(-4px);border-color:var(--blue)}
.platform-card.disabled{opacity:.5;cursor:default}
.platform-icon{font-size:36px;margin-bottom:12px}
.platform-card h4{font-size:15px;font-weight:700;margin-bottom:4px}
.platform-req{font-size:12px;color:var(--text-muted);margin-bottom:14px}
.platform-dl{display:inline-block;font-size:13px;font-weight:600;color:var(--blue);padding:6px 16px;border:1.5px solid var(--blue);border-radius:50px;transition:background .2s,color .2s}
.platform-card:hover:not(.disabled) .platform-dl{background:var(--blue);color:#fff}

/* -------- 价格套餐 -------- */
#pricing{padding:90px 0;background:var(--bg-section)}
.pricing-header{text-align:center;margin-bottom:48px}
.pricing-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;max-width:960px;margin:0 auto}
.price-card{background:#fff;border-radius:16px;padding:36px 32px;border:2px solid var(--border);position:relative;transition:box-shadow .25s,transform .25s}
.price-card.popular{border-color:var(--blue);box-shadow:0 8px 40px rgba(26,110,245,.15)}
.price-popular-badge{position:absolute;top:-14px;left:50%;transform:translateX(-50%);background:var(--blue);color:#fff;font-size:12px;font-weight:700;padding:4px 18px;border-radius:50px;white-space:nowrap}
.price-card h3{font-size:17px;font-weight:700;margin-bottom:6px}
.price-amount{display:flex;align-items:flex-end;gap:4px;margin:18px 0 6px}
.price-currency{font-size:22px;font-weight:700;color:var(--blue);margin-bottom:6px}
.price-value{font-size:52px;font-weight:900;color:var(--blue);line-height:1}
.price-period{font-size:15px;color:var(--text-muted);margin-bottom:8px}
.price-note{font-size:13px;color:var(--text-muted);margin-bottom:24px;min-height:20px}
.price-list{display:flex;flex-direction:column;gap:10px;margin-bottom:28px}
.price-list li{display:flex;align-items:center;gap:10px;font-size:14.5px;color:var(--text-muted)}
.price-list li::before{content:'✓';color:var(--blue);font-weight:700;font-size:14px;flex-shrink:0}
.price-btn{display:block;text-align:center;padding:13px;border-radius:50px;font-size:15px;font-weight:700;transition:background .2s,box-shadow .2s,transform .15s}
.price-btn-outline{border:2px solid var(--blue);color:var(--blue)}
.price-btn-outline:hover{background:var(--blue);color:#fff}
.price-btn-fill{background:var(--blue);color:#fff}
.price-btn-fill:hover{background:var(--blue-dark);box-shadow:0 6px 20px rgba(26,110,245,.3);transform:translateY(-1px)}

/* -------- 用户评价 -------- */
#testimonials{padding:90px 0}
.testimonials-header{text-align:center;margin-bottom:48px}
.reviews-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.review-card{background:#fff;border-radius:var(--radius);padding:28px;border:1px solid var(--border);transition:box-shadow .25s}
.review-card:hover{box-shadow:var(--shadow)}
.stars{color:#f59e0b;font-size:15px;margin-bottom:14px;letter-spacing:2px}
.review-text{font-size:15px;color:var(--text-muted);line-height:1.7;margin-bottom:20px;font-style:italic}
.reviewer{display:flex;align-items:center;gap:12px}
.reviewer-avatar{width:40px;height:40px;border-radius:50%;background:linear-gradient(135deg,var(--blue),#7dd3fc);display:flex;align-items:center;justify-content:center;color:#fff;font-size:15px;font-weight:700;flex-shrink:0}
.reviewer-name{font-size:14.5px;font-weight:700;color:var(--text)}
.reviewer-role{font-size:12.5px;color:var(--text-muted)}

/* -------- FAQ -------- */
#faq{padding:90px 0;background:var(--bg-section)}
.faq-header{text-align:center;margin-bottom:48px}
.faq-list{max-width:760px;margin:0 auto;display:flex;flex-direction:column;gap:12px}
.faq-item{background:#fff;border-radius:var(--radius);border:1px solid var(--border);overflow:hidden}
.faq-q{display:flex;align-items:center;justify-content:space-between;padding:18px 22px;font-size:15.5px;font-weight:600;cursor:pointer;gap:16px;user-select:none;transition:color .2s}
.faq-q:hover{color:var(--blue)}
.faq-icon{width:22px;height:22px;border-radius:50%;border:1.5px solid var(--border);display:flex;align-items:center;justify-content:center;flex-shrink:0;transition:background .2s,border-color .2s,transform .3s;font-size:14px;line-height:1}
.faq-item.open .faq-icon{background:var(--blue);border-color:var(--blue);color:#fff;transform:rotate(45deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .4s ease,padding .3s ease}
.faq-a-inner{padding:0 22px 18px;font-size:14.5px;color:var(--text-muted);line-height:1.7}
.faq-item.open .faq-a{max-height:200px}

/* -------- CTA -------- */
#cta{padding:90px 0;background:linear-gradient(135deg,#0a2a6e 0%,var(--blue) 100%);color:#fff;text-align:center}
#cta h2{font-size:clamp(26px,4vw,42px);font-weight:900;margin-bottom:12px}
#cta p{font-size:16px;opacity:.85;margin-bottom:36px}
.cta-actions{display:flex;justify-content:center;flex-wrap:wrap;gap:16px}

/* -------- Footer -------- */
#footer{background:#0d1b3e;color:rgba(255,255,255,.65);padding:56px 0 0}
.footer-inner{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;padding-bottom:40px;border-bottom:1px solid rgba(255,255,255,.1)}
.footer-brand img{width:40px;height:40px;border-radius:10px;margin-bottom:12px}
.footer-brand-name{font-size:18px;font-weight:800;color:#fff;margin-bottom:10px}
.footer-brand p{font-size:13.5px;line-height:1.7;max-width:280px;margin-bottom:20px}
.footer-social{display:flex;gap:10px}
.social-link{width:34px;height:34px;border-radius:8px;border:1px solid rgba(255,255,255,.2);display:flex;align-items:center;justify-content:center;font-size:16px;transition:border-color .2s,background .2s}
.social-link:hover{border-color:rgba(255,255,255,.6);background:rgba(255,255,255,.1)}
.footer-col h5{font-size:13px;font-weight:700;color:#fff;text-transform:uppercase;letter-spacing:.06em;margin-bottom:16px}
.footer-col a{display:block;font-size:13.5px;color:rgba(255,255,255,.55);margin-bottom:10px;transition:color .2s}
.footer-col a:hover{color:#fff}
.footer-bottom{padding:18px 0;text-align:center;font-size:12.5px;color:rgba(255,255,255,.35)}

/* -------- 响应式 -------- */
@media(max-width:1024px){
  .features-grid{grid-template-columns:repeat(2,1fr)}
  .nodes-grid{grid-template-columns:repeat(3,1fr)}
  .platforms-grid{grid-template-columns:repeat(3,1fr)}
  .footer-inner{grid-template-columns:1fr 1fr}
}
@media(max-width:768px){
  .nav-links,.nav-btn-login{display:none}
  .nav-links.mobile-open{display:flex;flex-direction:column;position:fixed;top:68px;left:0;right:0;background:#fff;padding:16px 24px 24px;border-bottom:1px solid var(--border);box-shadow:0 8px 24px rgba(0,0,0,.08);z-index:98;gap:4px}
  .nav-links.mobile-open a{padding:11px 14px}
  .nav-hamburger{display:flex}
  .hero-inner{grid-template-columns:1fr}
  .hero-img-wrap{display:none}
  .hero-stats{gap:20px}
  .detail-block{grid-template-columns:1fr}
  .detail-block.reverse{direction:ltr}
  .detail-img{order:-1}
  .pricing-grid{grid-template-columns:1fr}
  .reviews-grid{grid-template-columns:1fr}
  .nodes-grid{grid-template-columns:repeat(2,1fr)}
  .platforms-grid{grid-template-columns:repeat(2,1fr)}
  .footer-inner{grid-template-columns:1fr 1fr}
  .nodes-stats{gap:28px}
}
@media(max-width:480px){
  .hero-actions{flex-direction:column}
  .btn-primary,.btn-outline{justify-content:center}
  .nodes-grid{grid-template-columns:1fr 1fr}
  .platforms-grid{grid-template-columns:repeat(2,1fr)}
  .footer-inner{grid-template-columns:1fr}
  .cta-actions{flex-direction:column;align-items:center}
  .dl-bar-inner{flex-direction:column;align-items:flex-start}
}