:root{--bg:#0b0d12;--panel:#0f1320;--card:#121726;--muted:#8b90a5;--text:#e9ecf5;--brand:#2f6bff;--brand-2:#17d2ff;--ok:#13c2c2;--shadow:0 10px 30px rgba(0,0,0,.35)}
*{box-sizing:border-box}
html,body{margin:0;padding:0;background:radial-gradient(1200px 600px at 20% -10%,rgba(47,107,255,.18),transparent),radial-gradient(1000px 500px at 100% 10%,rgba(23,210,255,.12),transparent),var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Helvetica,Arial,'PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;font-size:20px;line-height:1.8;width:100%;overflow-x:hidden}
.container{max-width:1280px;margin:0 auto;padding:0 24px}

.site-header{position:sticky;top:0;z-index:10;background:linear-gradient(180deg,rgba(11,13,18,.9),rgba(11,13,18,.7) 60%,transparent);backdrop-filter:saturate(120%) blur(8px)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:64px}
.nav-toggle{display:none;position:relative;width:42px;height:42px;border-radius:10px;border:1px solid rgba(255,255,255,.14);background:rgba(255,255,255,.04);align-items:center;justify-content:center}
/* 更快的中心旋转动画（提高流畅性） */
.nav-toggle .bar{position:absolute;left:50%;top:50%;width:22px;height:2px;background:#fff;border-radius:2px;transform:translate(-50%,-50%);transition:transform .16s cubic-bezier(.22,.61,.36,1), opacity .16s cubic-bezier(.22,.61,.36,1), background-color .16s ease}
.nav-toggle .bar:nth-child(1){transform:translate(-50%,-50%) translateY(-7px)}
.nav-toggle .bar:nth-child(2){transform:translate(-50%,-50%)}
.nav-toggle .bar:nth-child(3){transform:translate(-50%,-50%) translateY(7px)}
/* 展开时变成 X */
.nav-toggle[aria-expanded="true"] .bar{background:var(--brand-2)}
.nav-toggle[aria-expanded="true"] .bar:nth-child(1){transform:translate(-50%,-50%) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .bar:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .bar:nth-child(3){transform:translate(-50%,-50%) rotate(-45deg)}
/* 鼠标悬停按钮时的反馈 */
.nav-toggle:hover{border-color:rgba(255,255,255,.28);background:rgba(255,255,255,.08)}
.nav-toggle:hover .bar{background:var(--brand)}
/* 展开后按钮变色，强调状态 */
.nav-toggle[aria-expanded="true"]{background:linear-gradient(135deg,var(--brand),var(--brand-2));border-color:transparent;box-shadow:0 6px 18px rgba(47,107,255,.35)}
.brand{display:flex;align-items:center;gap:10px;color:#fff;text-decoration:none;transition:transform .2s ease, color .2s ease, filter .2s ease}
.brand:hover{transform:scale(1.05);color:var(--brand-2);filter:drop-shadow(0 4px 12px rgba(23,210,255,.3))}
.brand-mark{display:inline-flex;align-items:center;justify-content:center;width:28px;height:28px;border-radius:8px;background:linear-gradient(135deg,var(--brand),var(--brand-2));font-weight:700}
.brand-text{font-weight:700}
.nav{display:flex;gap:18px;align-items:center;justify-content:space-between;flex:1;margin-left: 40px}
.nav a{color:var(--text);text-decoration:none;opacity:.9;transition:color .2s ease, opacity .2s ease}
.nav a:hover{opacity:1;color:var(--brand-2)}
.nav a:not(.btn-primary){flex:1;text-align:center}
.nav .btn-primary{background:linear-gradient(90deg,var(--brand) 50%,#fff 50%);background-size:200% 100%;background-position:0% 0%;border:1px solid var(--brand);color:#fff;font-weight:700;font-size:16px;transition:transform .2s ease, box-shadow .25s ease, background-position .4s ease, color .2s ease, border-color .2s ease}
.nav .btn-primary:hover{background-position:100% 0%;color:var(--brand);border-color:var(--brand)}
.brand-logo {
  height: auto;
  max-height: 40px; /* 根据您的设计调整 */
  width: auto;
  max-width: 200px; /* 根据您的设计调整 */
}
.btn{display:inline-flex;align-items:center;justify-content:center;padding:10px 16px;border-radius:10px;border:1px solid rgba(255,255,255,.1);color:var(--text);text-decoration:none;background:rgba(255,255,255,.03)}
.btn:hover{border-color:rgba(255,255,255,.2)}
.btn-primary{background:linear-gradient(135deg,var(--brand),var(--brand-2));border:none;color:#fff}
.btn-secondary{background:rgba(255,255,255,.08)}

.hero{display:grid;grid-template-columns:1.1fr .9fr;gap:40px;padding:72px 0 32px}
.hero h1{margin:0 0 12px;font-size:36px;line-height:1.25}
.hero-title{margin:0 0 20px;font-size:46px;line-height:1.3;background:linear-gradient(135deg,var(--brand),var(--brand-2));-webkit-background-clip:text;background-clip:text;color:transparent;filter:drop-shadow(0 6px 18px rgba(23,210,255,.25))}
.hero-kicker{display:block;margin:0 0 12px;font-size:50px;line-height:1.3;font-weight:800;color:#fff;letter-spacing:.2px;text-shadow:0 6px 28px rgba(0,0,0,.35)}
.hero-subtitle{margin:0 0 24px;color:#d6dbff;opacity:.95;font-size:24px}
.subtitle{margin:0 0 22px;color:var(--muted)}
.note{margin-top:10px;color:var(--muted);font-size:14px}
.hero-media{display:flex;align-items:center;justify-content:center}
.window{width:100%;max-width:560px;border-radius:14px;box-shadow:var(--shadow);background:var(--panel);border:1px solid rgba(255,255,255,.06)}
.window-bar{display:flex;gap:8px;padding:10px;border-bottom:1px solid rgba(255,255,255,.06)}
.window-bar span{width:10px;height:10px;border-radius:50%;background:rgba(255,255,255,.15)}
.window-body{padding:14px}
.mock-toolbar{height:36px;border-radius:8px;background:linear-gradient(180deg,rgba(255,255,255,.06),rgba(255,255,255,.02));margin-bottom:12px}
.mock-page{border-radius:10px;background:linear-gradient(180deg,#141a2b,#0f1423);padding:14px;border:1px solid rgba(255,255,255,.06)}
.mock-block{height:14px;border-radius:6px;background:rgba(255,255,255,.08);margin:10px 0}
.mock-block.title{height:22px;width:60%}
.mock-block.wide{width:92%}

/* 全屏主视觉 */
.hero-full{position:relative;display:flex;align-items:center;min-height:92vh;padding:0;background:transparent}
.hero-full::before{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(0,0,0,.20),rgba(0,0,0,.30)),var(--hero-bg, none);background-size:cover;background-position:center;z-index:0}
.hero-full > .container{position:relative;z-index:1;display:flex;justify-content:center}
.hero-full .hero-content{max-width:800px;margin:0 auto;text-align:center;padding:140px 0}
.hero-full .cta-group{justify-content:center}

/* 轻微浮动动画 */
.hero-kicker{animation:enterDown .7s ease-out both}
.hero-title{animation:enterDown .8s .08s ease-out both, glowPulse 4s 1.2s ease-in-out infinite}
.hero-subtitle{animation:enterUp .7s .16s ease-out both}

@keyframes enterDown{from{opacity:0;transform:translateY(-18px)}to{opacity:1;transform:translateY(0)}}
@keyframes enterUp{from{opacity:0;transform:translateY(16px)}to{opacity:1;transform:translateY(0)}}
@keyframes glowPulse{0%,100%{filter:drop-shadow(0 6px 18px rgba(23,210,255,.18))}50%{filter:drop-shadow(0 8px 28px rgba(23,210,255,.32))}}

/* 下载按钮吸睛效果：轻微脉冲 + 划过高光 */
.download-cta.btn-primary{position:relative;overflow:hidden;animation:pulseGlow 3.2s ease-in-out infinite}
.download-cta.btn-primary::before{content:"";position:absolute;inset:-40%;background:linear-gradient(120deg,rgba(255,255,255,0) 30%,rgba(255,255,255,.35) 50%,rgba(255,255,255,0) 70%);transform:translateX(-120%) rotate(12deg);transition:transform .8s ease}
.download-cta.btn-primary:hover::before{transform:translateX(120%) rotate(12deg)}
@keyframes pulseGlow{0%,100%{box-shadow:0 10px 26px rgba(47,107,255,.26),0 2px 6px rgba(0,0,0,.18)}50%{box-shadow:0 14px 36px rgba(47,107,255,.38),0 3px 10px rgba(0,0,0,.22)}}

/* 滚动入场动画 */
.scroll-fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.scroll-fade-in.animate {
  opacity: 1;
  transform: translateY(0);
}

/* 延迟动画类 */
.scroll-delay-1 { transition-delay: 0.1s; }
.scroll-delay-2 { transition-delay: 0.2s; }
.scroll-delay-3 { transition-delay: 0.3s; }
.scroll-delay-4 { transition-delay: 0.4s; }
.scroll-delay-5 { transition-delay: 0.5s; }
.scroll-delay-6 { transition-delay: 0.6s; }

/* 为section添加初始状态 */
section[id] {
  opacity: 0;
  transform: translateY(50px);
  transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

section[id].animate {
  opacity: 1;
  transform: translateY(0);
}

/* 为功能卡片添加动画 */
.feature-grid .card.scroll-fade-in {
  opacity: 0;
  transform: translateY(40px);
  transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.feature-grid .card.scroll-fade-in.animate {
  opacity: 1;
  transform: translateY(0);
}

/* 降低动效：系统开启减少动效时禁用复杂动画 */
@media (prefers-reduced-motion: reduce){
  .hero-kicker,.hero-title,.hero-subtitle,.download-cta.btn-primary{animation:none}
  .download-cta.btn-primary::before{display:none}
  .scroll-fade-in, section[id], .feature-grid .card.scroll-fade-in {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
}

/* 返回顶部按钮样式 */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  border: none;
  color: white;
  font-size: 18px;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 1000;
  box-shadow: 0 4px 20px rgba(47, 107, 255, 0.3);
}

.back-to-top:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(47, 107, 255, 0.4);
  background: linear-gradient(135deg, var(--brand-2), var(--brand));
}

.back-to-top:active {
  transform: translateY(0);
}

.back-to-top.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* 响应式设计 */
@media (max-width: 768px) {
  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 45px;
    height: 45px;
    font-size: 16px;
  }
}

/* 按钮悬停动画与发光 */
.btn{transition:transform .2s ease, box-shadow .25s ease, background .25s ease, border-color .25s ease}
.btn:hover{transform:scale(1.03)}
.btn-primary:hover{box-shadow:0 10px 28px rgba(47,107,255,.35),0 2px 6px rgba(0,0,0,.2)}
.btn-primary:active{transform:scale(1.0);box-shadow:0 6px 16px rgba(47,107,255,.28)}

.section{padding:96px 0}
.section h2{margin:0 0 24px;text-align:center;position:relative;font-size:36px}
.section h2::after{content:"";display:block;width:80px;height:3px;margin:12px auto 0;border-radius:3px;background:linear-gradient(90deg,var(--brand),var(--brand-2))}
.lead{margin:12px 0 24px;color:#d6dbff;opacity:.95;text-align:center;font-size:20px}
.feature-grid{display:grid;gap:32px;grid-template-columns:repeat(3,1fr)}
.scenario-grid{display:grid;gap:16px;grid-template-columns:repeat(4,1fr)}
.card{background:var(--card);border:1px solid rgba(255,255,255,.06);border-radius:12px;padding:24px;box-shadow:var(--shadow)}
.card h3{margin:0 0 12px;font-size:24px}
/* 功能卡片：左侧品牌色图标，右侧标题与描述 */
.feature-grid .card{display:grid;grid-template-columns:48px 1fr;column-gap:16px;align-items:flex-start;}
.feature-grid .card i{grid-column:1;grid-row:1 / span 2;display:block;color:var(--brand);font-size:38px;line-height:1}
.feature-grid .card h3{grid-column:2}
.feature-grid .card p{grid-column:2;margin:0}
/* 卡片说明文字与标题对齐为左对齐 */
.feature-grid .card p.lead{text-align:left}

/* PDF格式转换区：左字右图布局 */
.convert-content{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center;margin-top:32px}
.convert-text h3{margin:0 0 16px;font-size:28px;color:var(--brand)}
.convert-text p{margin:0 0 24px;color:var(--muted);line-height:1.6}
.convert-features{list-style:none;margin:0 0 24px;padding:0}
.convert-features li{display:flex;align-items:center;gap:12px;margin-bottom:12px;color:var(--muted);line-height:1.5}
.convert-features li:last-child{margin-bottom:0}
.convert-features li i{color:var(--brand);font-size:18px;width:20px;text-align:center}
/* 转换区内的下载按钮左对齐 */
.convert-text .cta-center{justify-content:flex-start}
.convert-image{display:flex;justify-content:center;align-items:center}
.convert-image img{max-width:100%;height:auto;border-radius:12px;box-shadow:var(--shadow)}

/* PDF加密区：左字右图布局 */
.secure-content{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center;margin-top:32px}
.secure-text h3{margin:0 0 16px;font-size:28px;color:var(--brand)}
.secure-text p{margin:0 0 24px;color:var(--muted);line-height:1.6}
/* 加密区内的下载按钮左对齐 */
.secure-text .cta-center{justify-content:flex-start}
.secure-image{display:flex;justify-content:center;align-items:center}

.cta-center{display:flex;justify-content:center;margin-top:20px}

.pricing{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.price-card{background:var(--card);border:1px solid rgba(255,255,255,.06);border-radius:16px;padding:18px;box-shadow:var(--shadow)}
.price-card .price{font-size:20px;margin:6px 0 12px;color:var(--ok)}
.price-card.highlight{border-color:rgba(47,107,255,.6)}
.price-card ul{margin:0 0 14px 18px;padding:0}

.site-footer{border-top:1px solid rgba(255,255,255,.06);padding:24px 0;background:rgba(0,0,0,.2)}
.footer-inner{display:flex;align-items:center;justify-content:center}
.footer-links{display:flex;gap:16px}
.footer-links a{color:var(--muted);text-decoration:none}
.footer-links a:hover{color:var(--text)}
.icp{text-align:center;padding:8px 20px 24px;color:var(--muted)}
.icp a{color:var(--muted);text-decoration:none;transition:color .2s ease}
.icp a:hover{color:var(--brand-2)}

@media (max-width: 980px){
  .hero{grid-template-columns:1fr;gap:22px}
  .feature-grid,.scenario-grid{grid-template-columns:repeat(2,1fr)}
  .pricing{grid-template-columns:1fr}
  .convert-content{grid-template-columns:1fr;gap:24px}
  .convert-text{text-align:left}
  .secure-content{grid-template-columns:1fr;gap:24px}
  .secure-text{text-align:left}
}

@media (max-width: 560px){
  .feature-grid,.scenario-grid{grid-template-columns:1fr}
}

/* 导航与主视觉在中小屏的适配 */
@media (max-width: 720px){
  .header-inner{height:auto;padding:8px 0}
  .nav-toggle{display:flex}
  /* 右侧抽屉式导航 */
  .nav{position:fixed;top:64px;right:0;bottom:0;width:85vw;max-width:400px;display:flex;flex-direction:column;align-items:flex-end;gap:12px;padding:20px;background:rgba(15,19,32,.98);border-left:1px solid rgba(255,255,255,.06);box-shadow:-16px 0 40px rgba(0,0,0,.35);transform:translateX(100%);opacity:1;pointer-events:none;transition:transform .2s cubic-bezier(.22,.61,.36,1);will-change:transform;z-index:1000}
  .nav.open{transform:translateX(0);pointer-events:auto}
  /* 防止导航展开时页面滚动 */
  body.nav-open{overflow:hidden; position:fixed; width:100%}
  .nav a{font-size:14px;padding:8px 12px;border-radius:8px;background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.08);text-align:center;white-space:nowrap}
  .nav .btn-primary{font-size:14px;padding:18px;font-weight:600;width:30%;margin-top:8px;text-align:center}
  .brand-text{font-size:16px}
  .hero-full .hero-content{padding:90px 0}
  .hero-kicker{font-size:32px}
  .hero-title{font-size:28px}
  .hero-subtitle{font-size:18px}
}

@media (max-width: 420px){
  .nav{gap:10px;width:90vw;max-width:380px;padding:18px}
  .nav a{font-size:14px;padding:10px 14px}
  .nav .btn-primary{font-size:15px;padding:14px 18px;width:30%;margin-top:10px}
  .hero-full .hero-content{padding:72px 0}
  .hero-kicker{font-size:28px}
  .hero-title{font-size:24px}
  .hero-subtitle{font-size:16px}
}

/* 超大屏幕优化 (>1440px) */
@media (min-width: 1440px){
  html,body{font-size:22px;line-height:1.9}
  .container{max-width:1400px;padding:0 32px}
  .section{padding:120px 0}
  .section h2{font-size:42px;margin:0 0 32px}
  .section h2::after{width:96px;margin:16px auto 0}
  .lead{font-size:22px;margin:8px 0 24px}
  .hero-kicker{font-size:56px}
  .hero-title{font-size:48px}
  .hero-subtitle{font-size:22px}
  .feature-grid{gap:40px}
  .card{padding:28px}
  .card h3{font-size:26px;margin:0 0 16px}
  .convert-content,.secure-content{gap:48px}
  .convert-text h3,.secure-text h3{font-size:32px}
}