:root{
  --brand:#B4FC75;
  --brand-hover:#A5ED66;
  --brand-shadow:rgba(180,252,117,.3);
  --bg:#0b0d12;
  --bg-soft:#10141c;
  --text:#e7f3ea;
  --muted:#9fb1a6;
  --card:rgba(255,255,255,.06);
  --card-hover:rgba(255,255,255,.08);
  --blur:14px;
  --radius:14px;
  --transition:all 0.3s cubic-bezier(0.4, 0.0, 0.2, 1);
  --shadow-sm:0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md:0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg:0 10px 15px -3px rgba(0, 0, 0, 0.1);
}
*{box-sizing:border-box}
*::before,*::after{box-sizing:border-box}

/* 平滑滚动 */
html{scroll-behavior:smooth}

/* 优化焦点样式 */
*:focus-visible{
  outline:2px solid var(--brand);
  outline-offset:2px;
}
html,body{margin:0;padding:0;background:radial-gradient(1200px 600px at 60% -10%, rgba(180,252,117,.08), transparent 60%), var(--bg);color:var(--text);font:16px/1.6 Inter,system-ui,Segoe UI,Arial;}
a{color:inherit;text-decoration:none}
.container{max-width:1100px;margin:0 auto;padding:0 20px}
nav{
  position:sticky; top:0; z-index:5;
  background:rgba(13,17,23,.6); backdrop-filter:saturate(160%) blur(10px);
  border-bottom:1px solid rgba(255,255,255,.08);
}
.nav-inner{display:flex;align-items:center;gap:18px;height:64px}
nav img.logo{height:28px}
nav .spacer{flex:1}
nav .link{
  padding:8px 12px;border-radius:10px;color:var(--muted);
  transition:var(--transition);
  position:relative;
}
nav .link:hover{
  color:var(--text);
  background:var(--card-hover);
  transform:translateY(-1px);
}
nav .link.active{
  color:#0b0d12;
  background:var(--brand);
  font-weight:600;
  box-shadow:var(--shadow-md);
}
nav .link:focus-visible{
  outline:2px solid var(--brand);
  outline-offset:2px;
}
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  height:44px;padding:0 18px;border-radius:12px;font-weight:700;
  background:var(--brand);color:#0b0d12;border:none;cursor:pointer;
  transition:var(--transition);
  box-shadow:var(--shadow-sm);
  position:relative;
  overflow:hidden;
}
.btn:hover{
  background:var(--brand-hover);
  transform:translateY(-2px);
  box-shadow:var(--shadow-lg);
}
.btn:active{
  transform:translateY(0);
  box-shadow:var(--shadow-sm);
}
.btn.ghost{
  background:transparent;
  color:var(--text);
  border:1px solid rgba(255,255,255,.15);
  box-shadow:none;
}
.btn.ghost:hover{
  background:var(--card-hover);
  border-color:var(--brand);
  color:var(--brand);
}
/* 按钮波纹效果 */
.btn::before{
  content:'';
  position:absolute;
  top:50%;left:50%;
  width:0;height:0;
  background:rgba(255,255,255,.2);
  border-radius:50%;
  transform:translate(-50%,-50%);
  transition:width 0.3s,height 0.3s;
}
.btn:active::before{
  width:300px;height:300px;
}
.hero{padding:72px 0 30px; text-align:center}
h1{font-size:44px;line-height:1.15;margin:0 0 10px}
p.lead{color:var(--muted);font-size:18px;margin:0 auto 22px;max-width:760px}
.badges{display:flex;justify-content:center;gap:10px;flex-wrap:wrap;margin:16px 0 24px}
.badge{padding:6px 10px;border-radius:999px;border:1px solid rgba(255,255,255,.12);color:var(--muted);font-size:13px}
.glass{
  background:var(--card);
  border:1px solid rgba(255,255,255,.12);
  border-radius:var(--radius);
  backdrop-filter: blur(var(--blur));
  transition:var(--transition);
}
.glass:hover{
  background:var(--card-hover);
  border-color:rgba(255,255,255,.18);
  transform:translateY(-2px);
  box-shadow:var(--shadow-lg);
}
.section{padding:36px 0}
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
/* 移动端优化 */
@media(max-width:980px){
  .cards{grid-template-columns:1fr}
  .hero{padding:48px 0 20px}
  h1{font-size:36px}
  .container{padding:0 16px}
  .nav-inner{gap:12px}
  nav .link{padding:6px 10px;font-size:14px}
}

@media(max-width:768px){
  h1{font-size:32px}
  .hero{padding:32px 0 16px}
  .btn{height:40px;padding:0 16px;font-size:14px}
  .cta-row{flex-direction:column;align-items:center}
  .footer-row{flex-direction:column;text-align:center}
}

@media(max-width:480px){
  h1{font-size:28px}
  .container{padding:0 12px}
  .hero{padding:24px 0 12px}
  .section{padding:24px 0}
  .nav-inner{height:56px}
  nav img.logo{height:24px}
}
.card{padding:26px;min-height:170px}
.card.big{min-height:240px}
.card h3{margin:0 0 8px}
.card p{margin:0;color:#cfe7d3}
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:10px}
@media(max-width:980px){
  .steps{grid-template-columns:1fr}
}

/* 加载动画 */
@keyframes fadeInUp{
  from{opacity:0;transform:translateY(30px)}
  to{opacity:1;transform:translateY(0)}
}

@keyframes pulse{
  0%,100%{opacity:1}
  50%{opacity:.5}
}

@keyframes slideInRight{
  from{opacity:0;transform:translateX(30px)}
  to{opacity:1;transform:translateX(0)}
}

/* 页面加载动画 */
.hero{animation:fadeInUp 0.8s ease-out}
.card{animation:fadeInUp 0.8s ease-out}
.card:nth-child(2){animation-delay:0.1s}
.card:nth-child(3){animation-delay:0.2s}
.step{animation:slideInRight 0.8s ease-out}
.step:nth-child(2){animation-delay:0.1s}
.step:nth-child(3){animation-delay:0.2s}

/* 语言切换过渡 */
[data-i18n]{transition:opacity 0.2s ease-in-out}
.lang-switching [data-i18n]{opacity:0.7}

/* 波纹效果 */
.ripple{
  position:absolute;
  border-radius:50%;
  background:rgba(255,255,255,.3);
  transform:scale(0);
  animation:ripple-animation 0.3s ease-out;
  pointer-events:none;
}

@keyframes ripple-animation{
  to{transform:scale(1);opacity:0}
}

/* 预加载优化 */
.preload *{transition:none !important;animation:none !important}

/* 滚动条美化 */
::-webkit-scrollbar{width:8px}
::-webkit-scrollbar-track{background:var(--bg-soft)}
::-webkit-scrollbar-thumb{background:var(--muted);border-radius:4px}
::-webkit-scrollbar-thumb:hover{background:var(--brand)}

/* 无障碍访问 */
.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;
}

/* 减少动画的用户偏好 */
@media (prefers-reduced-motion: reduce){
  *,*::before,*::after{
    animation-duration:0.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:0.01ms !important;
  }
}

/* 高对比度模式支持 */
@media (prefers-contrast: high){
  :root{
    --brand:#00FF00;
    --text:#FFFFFF;
    --bg:#000000;
    --card:rgba(255,255,255,.15);
  }
}
.step{padding:26px;border-radius:var(--radius);background:var(--card);border:1px solid rgba(255,255,255,.12)}
.step .num{font-weight:800;font-size:26px;color:#0b0d12;background:var(--brand);width:38px;height:38px;border-radius:10px;display:inline-flex;align-items:center;justify-content:center;margin-bottom:10px}
.step h4{margin:6px 0 8px;font-size:20px}
.step p{margin:0;color:#dff6e2}
.cta-row{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin:22px 0}
footer{margin-top:40px;padding:22px 0;border-top:1px solid rgba(255,255,255,.08);color:var(--muted)}
.footer-row{display:flex;align-items:center;gap:14px;justify-content:space-between;flex-wrap:wrap}
.social a{padding:8px 12px;border-radius:10px;border:1px solid rgba(255,255,255,.14);color:var(--text)}
/* download page specifics */
.download-wrap{display:grid;grid-template-columns:1.2fr .8fr;gap:20px;align-items:stretch}
@media(max-width:980px){.download-wrap{grid-template-columns:1fr}}
.panel{padding:26px}
.os-pill{display:inline-flex;align-items:center;gap:8px;border:1px solid rgba(255,255,255,.12);padding:6px 10px;border-radius:999px;font-size:13px;color:var(--muted)}
.ul{margin:10px 0 0 18px;color:#cfe7d3}
.ul li{margin:6px 0}
.code{font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;background:rgba(0,0,0,.35);padding:2px 6px;border-radius:6px}
.small{font-size:12px;color:var(--muted)}
.lang-switch{
  border:1px solid rgba(255,255,255,.14);
  background:transparent;
  border-radius:10px;
  padding:8px 10px;
  color:var(--text);
  transition:var(--transition);
  cursor:pointer;
}
.lang-switch:hover{
  border-color:var(--brand);
  background:var(--card-hover);
}
.lang-switch:focus{
  outline:2px solid var(--brand);
  outline-offset:2px;
}