:root{
  --primary:#2563eb;
  --primary-dark:#1e40af;
  --accent:#06b6d4;
  --dark:#0b1220;
  --text:#e5e7eb;
  --muted:#94a3b8;
}
body.xtc{
  --primary:#ef4444;
  --primary-dark:#b91c1c;
  --accent:#f97316;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  background:#0b1220;
  color:var(--text);
  line-height:1.7;
  overflow-x:hidden;
}
a{text-decoration:none;color:inherit}
/* ---- 背景动效 ---- */
.bg{
  position:fixed;inset:0;z-index:-1;overflow:hidden;
  background:radial-gradient(ellipse at 20% 20%,rgba(37,99,235,.18),transparent 50%),
             radial-gradient(ellipse at 80% 60%,rgba(6,182,212,.12),transparent 50%),
             #0b1220;
}
body.xtc .bg{
  background:radial-gradient(ellipse at 20% 20%,rgba(239,68,68,.16),transparent 50%),
             radial-gradient(ellipse at 80% 60%,rgba(249,115,22,.12),transparent 50%),
             #0b1220;
}
.grid-lines{
  position:absolute;inset:0;
  background-image:linear-gradient(rgba(148,163,184,.05) 1px,transparent 1px),
                   linear-gradient(90deg,rgba(148,163,184,.05) 1px,transparent 1px);
  background-size:60px 60px;
  mask-image:radial-gradient(ellipse at center,black 30%,transparent 75%);
  -webkit-mask-image:radial-gradient(ellipse at center,black 30%,transparent 75%);
}
/* ---- 顶部导航 ---- */
nav{
  position:fixed;top:0;left:0;right:0;z-index:100;
  display:flex;align-items:center;justify-content:space-between;
  padding:0 6vw;height:72px;
  background:rgba(11,18,32,.72);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid rgba(148,163,184,.12);
  transition:box-shadow .3s;
}
nav.scrolled{box-shadow:0 8px 30px rgba(0,0,0,.45)}
.logo{display:flex;align-items:center;gap:10px;font-weight:700;font-size:20px;letter-spacing:.5px}
.logo-badge{
  width:34px;height:34px;border-radius:9px;
  background:linear-gradient(135deg,var(--primary),var(--accent));
  display:flex;align-items:center;justify-content:center;
  font-weight:800;color:#fff;font-size:17px;
  box-shadow:0 4px 14px rgba(37,99,235,.45);
}
body.xtc .logo-badge{box-shadow:0 4px 14px rgba(239,68,68,.45)}
nav ul{display:flex;list-style:none;gap:8px}
nav ul a{
  padding:9px 18px;border-radius:8px;font-size:15px;font-weight:500;
  color:var(--muted);transition:all .25s;position:relative;
}
nav ul a::after{
  content:"";position:absolute;left:50%;bottom:2px;transform:translateX(-50%);
  width:0;height:2px;border-radius:2px;
  background:linear-gradient(90deg,var(--primary),var(--accent));
  transition:width .25s;
}
nav ul a:hover{color:#fff}
nav ul a:hover::after{width:60%}
nav ul a.active{color:#fff}
nav ul a.active::after{width:60%}
/* ---- Hero ---- */
.hero{
  min-height:100vh;display:flex;flex-direction:column;
  align-items:center;justify-content:center;text-align:center;
  padding:120px 6vw 80px;position:relative;
}
.hero h1{
  font-size:clamp(40px,7vw,84px);font-weight:800;line-height:1.15;
  background:linear-gradient(120deg,#fff 20%,#93c5fd 60%,#67e8f9);
  -webkit-background-clip:text;background-clip:text;color:transparent;
  animation:rise 1s ease both;
}
.hero h1 em{
  font-style:normal;
  background:linear-gradient(120deg,var(--primary),var(--accent));
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.hero p{
  margin-top:26px;max-width:680px;font-size:clamp(16px,2.2vw,20px);
  color:var(--muted);animation:rise 1s .15s ease both;
}
.hero-btns{margin-top:44px;display:flex;gap:18px;flex-wrap:wrap;justify-content:center;animation:rise 1s .3s ease both}
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:14px 34px;border-radius:999px;font-size:16px;font-weight:600;
  transition:all .3s;cursor:pointer;border:none;
}
.btn-primary{
  background:linear-gradient(120deg,var(--primary),var(--accent));
  color:#fff;box-shadow:0 10px 30px rgba(37,99,235,.4);
}
.btn-primary:hover{transform:translateY(-3px);box-shadow:0 16px 40px rgba(37,99,235,.55)}
.btn-ghost{
  background:rgba(148,163,184,.08);color:var(--text);
  border:1px solid rgba(148,163,184,.25);
}
.btn-ghost:hover{background:rgba(148,163,184,.16);transform:translateY(-3px)}
.scroll-hint{
  position:absolute;bottom:34px;left:50%;transform:translateX(-50%);
  color:var(--muted);font-size:13px;letter-spacing:2px;
  animation:bob 2.2s ease-in-out infinite;
}
/* ---- 页面头（详情/关于页） ---- */
.page-head{
  padding:170px 6vw 60px;text-align:center;
}
.page-head .p-icon-big{width:96px;height:96px;object-fit:contain;filter:drop-shadow(0 10px 28px rgba(239,68,68,.5));animation:rise 1s ease both}
.page-head h1{
  font-size:clamp(32px,5vw,56px);font-weight:800;
  background:linear-gradient(120deg,#fff 20%,#93c5fd 60%,#67e8f9);
  -webkit-background-clip:text;background-clip:text;color:transparent;
  animation:rise 1s ease both;
}
body.xtc .page-head h1{
  background:linear-gradient(120deg,#fff 20%,#fca5a5 60%,#fdba74);
  -webkit-background-clip:text;background-clip:text;
}
.page-head h1 span{
  background:linear-gradient(120deg,var(--primary),var(--accent));
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.page-head p{margin-top:16px;color:var(--muted);font-size:16px;animation:rise 1s .15s ease both}
.page-head .zh{color:var(--accent);font-size:18px;font-weight:600;letter-spacing:6px;margin-top:10px;animation:rise 1s .2s ease both}
/* ---- 通用容器 ---- */
.wrap{max-width:960px;margin:0 auto;padding:0 6vw 60px}
/* ---- 产品区 ---- */
.products{
  max-width:1200px;margin:0 auto;padding:0 6vw 120px;
}
.section-title{
  text-align:center;margin-bottom:70px;animation:rise 1s both;
}
.section-title h2{font-size:clamp(28px,4vw,42px);font-weight:800}
.section-title h2 span{color:var(--accent)}
.section-title p{margin-top:14px;color:var(--muted);font-size:16px}
.product{
  display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center;
  padding:70px 0;border-top:1px solid rgba(148,163,184,.12);
  animation:rise 1s both;
}
.product:nth-child(even){direction:rtl}
.product:nth-child(even) .p-body{direction:ltr}
.p-visual{display:flex;align-items:center;justify-content:center}
.p-card{
  width:100%;max-width:420px;aspect-ratio:4/3;border-radius:22px;
  background:rgba(255,255,255,.04);
  border:1px solid rgba(148,163,184,.16);
  backdrop-filter:blur(10px);
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  gap:18px;position:relative;overflow:hidden;
  transition:transform .4s,box-shadow .4s;
}
.p-card:hover{transform:translateY(-6px) scale(1.02);box-shadow:0 24px 60px rgba(0,0,0,.5)}
.p-card::before{
  content:"";position:absolute;top:-40%;left:-40%;width:80%;height:80%;
  background:radial-gradient(circle,var(--pc,rgba(37,99,235,.35)),transparent 70%);
  pointer-events:none;
}
.p-icon{
  font-size:64px;filter:drop-shadow(0 8px 24px var(--pc,rgba(37,99,235,.5)));
}
.p-img{
  width:88px;height:88px;object-fit:contain;
  filter:drop-shadow(0 8px 24px var(--pc,rgba(37,99,235,.5)));
}
.p-card .p-tagline{font-size:20px;font-weight:700;letter-spacing:6px;color:#fff}
.p-card .p-num{position:absolute;top:14px;right:20px;font-size:13px;color:var(--muted);letter-spacing:2px}
.p-body h3{font-size:clamp(24px,3vw,34px);font-weight:800;margin-bottom:6px}
.p-body .sub{display:inline-block;color:var(--accent);font-weight:600;font-size:14px;letter-spacing:2px;margin-bottom:18px}
.p-body p{color:var(--muted);font-size:16px;margin-bottom:28px}
.features{list-style:none;display:grid;grid-template-columns:1fr 1fr;gap:12px 20px;margin-bottom:34px}
.features li{
  display:flex;align-items:center;gap:9px;font-size:14.5px;color:var(--text);
  background:rgba(148,163,184,.07);padding:10px 14px;border-radius:10px;
}
.features li::before{
  content:"✓";flex:none;width:20px;height:20px;border-radius:50%;
  background:linear-gradient(135deg,var(--primary),var(--accent));
  color:#fff;font-size:11px;display:flex;align-items:center;justify-content:center;
}
.btn-detail{
  display:inline-flex;align-items:center;gap:8px;
  padding:12px 28px;border-radius:10px;font-weight:600;font-size:15px;
  background:linear-gradient(120deg,var(--primary),var(--accent));
  color:#fff;box-shadow:0 8px 24px rgba(37,99,235,.35);
  transition:all .3s;border:none;cursor:pointer;
}
.btn-detail:hover{transform:translateY(-3px);box-shadow:0 14px 34px rgba(37,99,235,.5)}
.btn-detail .arr{transition:transform .3s}
.btn-detail:hover .arr{transform:translateX(5px)}
/* ---- 关于区（首页） ---- */
.about{
  max-width:1200px;margin:0 auto;padding:0 6vw 120px;
}
.about-grid{
  display:grid;grid-template-columns:repeat(3,1fr);gap:26px;
  animation:rise 1s both;
}
.about-card{
  background:rgba(255,255,255,.04);
  border:1px solid rgba(148,163,184,.16);
  border-radius:18px;padding:36px 30px;text-align:center;
  backdrop-filter:blur(10px);
  transition:transform .35s,box-shadow .35s,border-color .35s;
}
.about-card:hover{
  transform:translateY(-6px);
  border-color:rgba(6,182,212,.45);
  box-shadow:0 20px 48px rgba(0,0,0,.45);
}
.about-icon{font-size:40px;margin-bottom:16px}
.about-card h4{font-size:19px;font-weight:700;margin-bottom:10px;letter-spacing:2px}
.about-card p{color:var(--muted);font-size:14.5px}
/* ---- 作者（关于页） ---- */
.author-card{
  display:flex;gap:44px;align-items:center;
  background:rgba(255,255,255,.04);
  border:1px solid rgba(148,163,184,.16);
  border-radius:22px;padding:48px 46px;
  backdrop-filter:blur(10px);
  animation:rise 1s .2s ease both;
}
.author-avatar{
  flex:none;width:150px;height:150px;border-radius:50%;
  background:linear-gradient(135deg,var(--primary),var(--accent));
  display:flex;align-items:center;justify-content:center;
  font-size:60px;font-weight:800;color:#fff;
  box-shadow:0 14px 40px rgba(37,99,235,.45);
}
.author-info h2{font-size:28px;font-weight:800;margin-bottom:4px}
.author-info .en{color:var(--accent);font-weight:600;font-size:14px;letter-spacing:2px;margin-bottom:20px;display:block}
.author-info p{color:var(--muted);font-size:15.5px;margin-bottom:12px}
.author-info p b{color:var(--text)}
.tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}
.tags span{
  padding:7px 16px;border-radius:999px;font-size:13px;
  background:rgba(6,182,212,.1);color:#67e8f9;
  border:1px solid rgba(6,182,212,.3);
}
/* ---- 联系方式（关于页） ---- */
.contact{margin-top:56px;animation:rise 1s .3s ease both}
.contact h3{
  font-size:26px;font-weight:800;margin-bottom:30px;text-align:center;
}
.contact h3 span{color:var(--accent)}
.contact-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.c-card{
  background:rgba(255,255,255,.04);
  border:1px solid rgba(148,163,184,.16);
  border-radius:18px;padding:32px 28px;text-align:center;
  transition:transform .35s,box-shadow .35s,border-color .35s;
}
.c-card:hover{
  transform:translateY(-6px);
  border-color:rgba(6,182,212,.45);
  box-shadow:0 20px 48px rgba(0,0,0,.45);
}
.c-icon{font-size:36px;margin-bottom:14px}
.c-card h4{font-size:16px;font-weight:700;letter-spacing:2px;margin-bottom:8px;color:#fff}
.c-card .c-value{font-size:18px;font-weight:700;color:#67e8f9;word-break:break-all}
.c-card .c-note{font-size:13px;color:var(--muted);margin-top:10px}
.c-card a.c-value{transition:color .3s}
.c-card a.c-value:hover{color:#fff}
/* ---- 内容块（详情页） ---- */
.block{
  background:rgba(255,255,255,.04);
  border:1px solid rgba(148,163,184,.16);
  border-radius:22px;padding:44px 46px;
  backdrop-filter:blur(10px);
  animation:rise 1s .3s ease both;
}
.block{margin-bottom:52px}
.block h3{
  font-size:24px;font-weight:800;margin-bottom:20px;
  display:flex;align-items:center;gap:12px;
}
.block h3::before{
  content:"";width:6px;height:26px;border-radius:3px;
  background:linear-gradient(180deg,var(--primary),var(--accent));
}
.block p{color:var(--muted);font-size:15.5px;margin-bottom:14px}
.block p b{color:var(--text)}
/* ---- 格式支持（XTC 详情页） ---- */
.formats{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:30px}
.format-card{
  text-align:center;padding:30px 20px;border-radius:16px;
  background:rgba(255,255,255,.04);
  border:1px solid rgba(148,163,184,.16);
  transition:transform .35s,border-color .35s,box-shadow .35s;
}
.format-card:hover{
  transform:translateY(-6px);
  border-color:rgba(249,115,22,.5);
  box-shadow:0 18px 44px rgba(0,0,0,.45);
}
.format-card .fmt{
  font-size:26px;font-weight:800;letter-spacing:2px;
  background:linear-gradient(120deg,var(--primary),var(--accent));
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.format-card .desc{font-size:13px;color:var(--muted);margin-top:8px}
/* ---- 截图预览（XTC 详情页） ---- */
.screenshots{display:flex;flex-direction:column;gap:32px;margin-top:30px}
.screenshots img{
  width:100%;height:auto;
  border-radius:16px;display:block;
  border:1px solid rgba(148,163,184,.16);
  transition:transform .35s,border-color .35s,box-shadow .35s;
}
.screenshots img:hover{
  transform:translateY(-6px);
  border-color:rgba(249,115,22,.5);
  box-shadow:0 18px 44px rgba(0,0,0,.45);
}
/* ---- 全屏查看 ---- */
.lightbox{
  position:fixed;inset:0;z-index:999;
  background:rgba(0,0,0,.92);
  display:flex;align-items:center;justify-content:center;
  padding:3vh 3vw;opacity:0;visibility:hidden;
  transition:opacity .3s,visibility .3s;cursor:zoom-out;
}
.lightbox.open{opacity:1;visibility:visible}
.lightbox img{
  max-width:100%;max-height:94vh;border-radius:8px;
  box-shadow:0 24px 80px rgba(0,0,0,.6);
  transform:scale(.96);transition:transform .3s;
}
.lightbox.open img{transform:scale(1)}
/* ---- 返回 ---- */
.back-cta{text-align:center;margin-top:56px;animation:rise 1s .4s ease both}
.btn-back{
  display:inline-flex;align-items:center;gap:8px;
  padding:13px 32px;border-radius:999px;font-size:15px;font-weight:600;
  background:linear-gradient(120deg,var(--primary),var(--accent));
  color:#fff;box-shadow:0 10px 30px rgba(239,68,68,.35);
  transition:all .3s;
}
.btn-back:hover{transform:translateY(-3px);box-shadow:0 16px 40px rgba(239,68,68,.5)}
/* ---- 页脚 ---- */
footer{
  border-top:1px solid rgba(148,163,184,.12);
  padding:44px 6vw;text-align:center;color:var(--muted);font-size:14px;
}
footer .brand{font-weight:700;color:var(--text);font-size:17px;margin-bottom:10px;letter-spacing:4px}
footer a.beian{color:var(--muted);transition:color .3s}
footer a.beian:hover{color:#fff}
footer .links{display:flex;justify-content:center;gap:26px;margin-bottom:16px}
footer .links a{color:var(--muted);font-size:13px;transition:color .3s}
footer .links a:hover{color:#fff}
/* ---- 动画 ---- */
@keyframes rise{from{opacity:0;transform:translateY(34px)}to{opacity:1;transform:translateY(0)}}
@keyframes bob{0%,100%{transform:translateX(-50%) translateY(0)}50%{transform:translateX(-50%) translateY(-10px)}}
/* ---- 响应式 ---- */
@media(max-width:900px){
  nav{padding:0 4vw}
  nav ul a{padding:8px 10px;font-size:14px}
  .product{grid-template-columns:1fr;gap:34px;padding:50px 0}
  .p-card{max-width:340px}
  .products{padding:0 5vw 80px}
  .about-grid{grid-template-columns:1fr}
  .about{padding:0 5vw 80px}
  .author-card{flex-direction:column;text-align:center;padding:36px 26px;gap:28px}
  .contact-grid{grid-template-columns:1fr}
  .formats{grid-template-columns:1fr}
  .block{padding:32px 26px}
}
@media(max-width:560px){
  nav ul a{padding:8px 7px;font-size:12.5px}
  .logo span.hide-sm{display:none}
  .features{grid-template-columns:1fr}
  .hero{padding-top:140px}
  .page-head{padding-top:140px}
  .author-avatar{width:120px;height:120px;font-size:46px}
  footer .links{flex-wrap:wrap;gap:14px}
}