/* ============================================================
   宜思仿真 ESIM — 站点样式
   深色科技风 / 响应式 / 纯静态
   ============================================================ */

:root{
  --bg:        #060a12;
  --bg-soft:   #0b1220;
  --bg-card:   #0e1626;
  --line:      rgba(255,255,255,.09);
  --line-strong:rgba(255,255,255,.18);
  --txt:       #e9eef8;
  --txt-muted: #8d9ab1;
  --brand:     #00d2ff;
  --brand-2:   #0a63ff;
  --gold:      #ffc45c;
  --radius:    14px;
  --nav-h:     72px;
  --maxw:      1240px;
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--bg);
  color:var(--txt);
  font-family:"PingFang SC","Microsoft YaHei","Helvetica Neue",Helvetica,Arial,sans-serif;
  font-size:16px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
h1,h2,h3,h4{margin:0;font-weight:700;letter-spacing:.02em;line-height:1.3;}
p{margin:0;}
ul{margin:0;padding:0;list-style:none;}

.wrap{max-width:var(--maxw);margin:0 auto;padding:0 28px;}

/* ---------- 通用按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;gap:10px;
  padding:12px 26px;border-radius:999px;
  font-size:15px;font-weight:600;letter-spacing:.05em;
  border:1px solid var(--line-strong);
  background:rgba(255,255,255,.04);
  color:var(--txt);cursor:pointer;
  transition:.28s cubic-bezier(.4,0,.2,1);
}
.btn:hover{border-color:var(--brand);color:var(--brand);transform:translateY(-2px);}
.btn-primary{
  background:linear-gradient(120deg,var(--brand-2),var(--brand));
  border-color:transparent;color:#04121f;
  box-shadow:0 8px 26px rgba(0,120,255,.28);
}
.btn-primary:hover{color:#04121f;box-shadow:0 12px 34px rgba(0,160,255,.42);}

/* ---------- 顶部导航 ---------- */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:100;
  height:var(--nav-h);
  display:flex;align-items:center;
  transition:background .3s,border-color .3s,backdrop-filter .3s;
  border-bottom:1px solid transparent;
}
.nav.scrolled{
  background:rgba(6,10,18,.82);
  backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line);
}
.nav .wrap{display:flex;align-items:center;justify-content:space-between;width:100%;}
.logo{display:flex;align-items:center;gap:12px;}
.logo-mark{
  width:38px;height:38px;border-radius:9px;flex:none;
  background:linear-gradient(135deg,var(--brand),var(--brand-2));
  display:grid;place-items:center;
  font-weight:800;font-size:17px;color:#04121f;letter-spacing:-.04em;
}
.logo-txt b{display:block;font-size:17px;letter-spacing:.16em;}
.logo-txt span{display:block;font-size:10px;letter-spacing:.28em;color:var(--txt-muted);text-transform:uppercase;}

.menu{display:flex;align-items:center;gap:4px;}
.menu > li{position:relative;}
.menu a{
  display:block;padding:10px 16px;font-size:15px;color:#c9d3e4;
  transition:color .2s;
}
.menu > li > a:hover,.menu .active > a{color:var(--brand);}
.menu a .caret{font-size:9px;margin-left:5px;opacity:.6;}
.dropdown{
  position:absolute;top:100%;left:50%;transform:translate(-50%,10px);
  min-width:220px;padding:8px;
  background:rgba(11,18,32,.97);backdrop-filter:blur(14px);
  border:1px solid var(--line);border-radius:12px;
  box-shadow:0 18px 44px rgba(0,0,0,.5);
  opacity:0;visibility:hidden;transition:.24s;
}
.menu li:hover .dropdown{opacity:1;visibility:visible;transform:translate(-50%,0);}
.dropdown a{padding:9px 14px;font-size:14px;border-radius:8px;color:#b8c4d8;}
.dropdown a:hover{background:rgba(0,210,255,.1);color:var(--brand);}

.nav-tel{
  display:flex;align-items:center;gap:8px;
  font-size:15px;font-weight:600;color:var(--brand);
  padding-left:18px;border-left:1px solid var(--line);
}
.burger{display:none;width:42px;height:42px;border:1px solid var(--line);
  border-radius:10px;background:none;cursor:pointer;position:relative;}
.burger span{position:absolute;left:11px;right:11px;height:1.5px;background:var(--txt);transition:.3s;}
.burger span:nth-child(1){top:15px;}
.burger span:nth-child(2){top:20.5px;}
.burger span:nth-child(3){top:26px;}
.burger.on span:nth-child(1){transform:translateY(5.5px) rotate(45deg);}
.burger.on span:nth-child(2){opacity:0;}
.burger.on span:nth-child(3){transform:translateY(-5.5px) rotate(-45deg);}

/* ---------- Hero ---------- */
.hero{position:relative;min-height:100vh;display:flex;align-items:center;overflow:hidden;}
#wave{position:absolute;inset:0;width:100%;height:100%;}
.hero::after{
  content:"";position:absolute;inset:0;
  background:
    radial-gradient(1000px 600px at 70% 40%,rgba(0,120,255,.22),transparent 65%),
    linear-gradient(180deg,rgba(6,10,18,.35) 0%,rgba(6,10,18,.82) 62%,var(--bg) 100%);
}
.hero-inner{position:relative;z-index:2;padding-top:var(--nav-h);width:100%;}
.hero h1{
  font-size:clamp(34px,5.2vw,68px);font-weight:800;letter-spacing:.04em;
  background:linear-gradient(100deg,#fff 10%,#9fd8ff 55%,#4aa8ff 100%);
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.hero .slogan{
  margin-top:26px;font-size:clamp(22px,3.2vw,44px);
  letter-spacing:.16em;line-height:1.5;font-weight:600;
  background:linear-gradient(100deg,#a9e8ff,#4aa8ff 60%,#0a63ff);
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.hero p.lead{
  margin-top:26px;max-width:640px;font-size:17px;color:#b6c2d6;
}
.hero-actions{margin-top:40px;display:flex;gap:14px;flex-wrap:wrap;}
.hero-stats{
  margin-top:70px;display:grid;gap:30px;
  grid-template-columns:repeat(3,minmax(0,1fr));max-width:720px;
  border-top:1px solid var(--line);padding-top:28px;
}
.hero-stats b{display:block;font-size:34px;color:#fff;letter-spacing:.02em;}
.hero-stats span{font-size:13px;color:var(--txt-muted);letter-spacing:.1em;}

/* ---------- 通用区块 ---------- */
.section{padding:110px 0;position:relative;}
.section.alt{background:linear-gradient(180deg,var(--bg),var(--bg-soft) 40%,var(--bg));}
.sec-head{max-width:760px;margin-bottom:56px;}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-size:12px;letter-spacing:.28em;color:var(--brand);
  text-transform:uppercase;margin-bottom:16px;
}
.eyebrow::before{content:"";width:26px;height:1px;background:var(--brand);}
.sec-head h2{font-size:clamp(26px,3.4vw,42px);}
.sec-head p{margin-top:18px;color:var(--txt-muted);font-size:16.5px;}

/* ---------- 双栏图文 ---------- */
.split{display:grid;grid-template-columns:1.05fr .95fr;gap:64px;align-items:center;}
.split.rev .split-txt{order:2;}
.split h3{font-size:clamp(22px,2.6vw,32px);margin-bottom:20px;}
.split h3 em{font-style:normal;color:var(--brand);}
.split p{color:#a9b6cc;margin-bottom:28px;}
.kv{display:flex;gap:14px;flex-wrap:wrap;}
.kv li{
  padding:8px 16px;border:1px solid var(--line);border-radius:999px;
  font-size:13.5px;color:#c2cee1;background:rgba(255,255,255,.03);
}
.visual{
  position:relative;border:1px solid var(--line);border-radius:18px;
  background:linear-gradient(160deg,#0d1728,#080d18);
  padding:26px;min-height:300px;overflow:hidden;
}
.visual::before{
  content:"";position:absolute;inset:0;
  background:radial-gradient(500px 300px at 50% 0%,rgba(0,150,255,.18),transparent 70%);
}
.visual svg{width:100%;height:auto;position:relative;}

/* ---------- 卡片 ---------- */
.grid{display:grid;gap:22px;}
.g3{grid-template-columns:repeat(3,minmax(0,1fr));}
.g4{grid-template-columns:repeat(4,minmax(0,1fr));}
.g2{grid-template-columns:repeat(2,minmax(0,1fr));}
.card{
  position:relative;padding:32px 28px;border-radius:var(--radius);
  border:1px solid var(--line);
  background:linear-gradient(165deg,rgba(20,32,52,.9),rgba(9,14,24,.9));
  overflow:hidden;transition:.32s cubic-bezier(.4,0,.2,1);
}
.card::after{
  content:"";position:absolute;left:0;right:0;top:0;height:2px;
  background:linear-gradient(90deg,var(--brand),var(--brand-2),transparent);
  transform:scaleX(0);transform-origin:left;transition:.4s;
}
.card:hover{transform:translateY(-6px);border-color:rgba(0,210,255,.4);
  box-shadow:0 20px 46px rgba(0,0,0,.45);}
.card:hover::after{transform:scaleX(1);}
.card .ic{
  width:46px;height:46px;border-radius:12px;margin-bottom:20px;
  display:grid;place-items:center;font-size:20px;font-weight:700;
  background:rgba(0,210,255,.1);border:1px solid rgba(0,210,255,.28);color:var(--brand);
}
.card h4{font-size:19px;margin-bottom:12px;}
.card p{font-size:14.5px;color:var(--txt-muted);}
.card .tag{
  display:inline-block;margin-top:16px;font-size:12px;letter-spacing:.1em;
  color:var(--brand);opacity:.85;
}

/* ---------- 参数表 ---------- */
.spec{
  border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;
  background:rgba(10,16,28,.7);
}
.spec-row{display:grid;grid-template-columns:200px 1fr;gap:0;
  border-bottom:1px solid var(--line);}
.spec-row:last-child{border-bottom:none;}
.spec-row div{padding:16px 24px;font-size:15px;}
.spec-row div:first-child{color:var(--txt-muted);background:rgba(255,255,255,.02);}
.spec-row div:last-child{color:#dbe4f2;}

/* ---------- 数字墙 ---------- */
.numbers{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;}
.number{
  text-align:center;padding:34px 18px;border-radius:var(--radius);
  border:1px solid var(--line);background:rgba(255,255,255,.02);
}
.number b{display:block;font-size:40px;color:#fff;letter-spacing:.02em;}
.number b i{font-style:normal;font-size:20px;color:var(--brand);}
.number span{font-size:14px;color:var(--txt-muted);}

/* ---------- 时间线 ---------- */
.timeline{position:relative;padding-left:30px;}
.timeline::before{content:"";position:absolute;left:6px;top:6px;bottom:6px;width:1px;
  background:linear-gradient(180deg,var(--brand),transparent);}
.timeline li{position:relative;padding-bottom:30px;}
.timeline li::before{content:"";position:absolute;left:-28px;top:9px;width:11px;height:11px;
  border-radius:50%;background:var(--bg);border:2px solid var(--brand);}
.timeline b{display:block;font-size:17px;margin-bottom:6px;}
.timeline p{font-size:14.5px;color:var(--txt-muted);}

/* ---------- 联系区 ---------- */
.contact{display:grid;grid-template-columns:.9fr 1.1fr;gap:56px;align-items:start;}
.field{margin-bottom:18px;}
.field label{display:block;font-size:13px;color:var(--txt-muted);margin-bottom:8px;letter-spacing:.08em;}
.field input,.field textarea{
  width:100%;padding:13px 16px;border-radius:10px;
  background:rgba(255,255,255,.04);border:1px solid var(--line);
  color:var(--txt);font-size:15px;font-family:inherit;outline:none;transition:.2s;
}
.field input:focus,.field textarea:focus{border-color:var(--brand);background:rgba(0,210,255,.05);}
.field textarea{min-height:110px;resize:vertical;}
.form-note{margin-top:14px;font-size:13px;color:var(--txt-muted);}
.contact-info li{display:flex;gap:14px;padding:14px 0;border-bottom:1px solid var(--line);font-size:15px;}
.contact-info li span:first-child{color:var(--brand);min-width:70px;font-size:13px;letter-spacing:.1em;}
.qr{
  display:inline-block;padding:10px;border-radius:12px;
  border:1px solid var(--line);background:#fff;
}
.qr svg{display:block;}

/* ---------- 页脚 ---------- */
.footer{border-top:1px solid var(--line);padding:56px 0 34px;background:var(--bg-soft);}
.footer-top{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:40px;}
.footer h5{font-size:15px;margin-bottom:18px;letter-spacing:.1em;}
.footer li{font-size:14px;color:var(--txt-muted);padding:6px 0;}
.footer li a:hover{color:var(--brand);}
.footer p.f{font-size:14px;color:var(--txt-muted);margin-top:16px;max-width:340px;}
.footer-bottom{
  margin-top:44px;padding-top:22px;border-top:1px solid var(--line);
  display:flex;justify-content:space-between;gap:18px;flex-wrap:wrap;
  font-size:13px;color:#66738a;
}
.footer-bottom a{color:#8d9ab1;text-decoration:none;transition:color .2s}
.footer-bottom a:hover{color:var(--brand)}
.icp-fallback{padding:24px 0;font-size:13px;color:#66738a;text-align:center}
.icp-fallback a{color:#8d9ab1;text-decoration:none}
.icp-fallback a:hover{color:var(--brand)}

/* ---------- 页面标题带 ---------- */
.pagehead{
  padding:calc(var(--nav-h) + 90px) 0 70px;
  background:
    radial-gradient(700px 320px at 20% 20%,rgba(0,120,255,.18),transparent 70%),
    linear-gradient(180deg,var(--bg-soft),var(--bg));
  border-bottom:1px solid var(--line);
}
.pagehead h1{font-size:clamp(28px,4vw,46px);}
.pagehead p{margin-top:16px;color:var(--txt-muted);max-width:640px;}
.crumb{font-size:13px;color:#66738a;margin-bottom:18px;letter-spacing:.08em;}
.crumb a:hover{color:var(--brand);}

/* ---------- 动效 ---------- */
.reveal{opacity:0;transform:translateY(26px);transition:opacity .7s,transform .7s;}
.reveal.in{opacity:1;transform:none;}

/* ---------- 响应式 ---------- */
@media (max-width:1024px){
  .split{grid-template-columns:1fr;gap:40px;}
  .split.rev .split-txt{order:0;}
  .g4{grid-template-columns:repeat(2,1fr);}
  .g3{grid-template-columns:repeat(2,1fr);}
  .numbers{grid-template-columns:repeat(2,1fr);}
  .footer-top{grid-template-columns:1fr 1fr;}
  .contact{grid-template-columns:1fr;gap:40px;}
}
@media (max-width:860px){
  .menu{
    position:fixed;top:var(--nav-h);left:0;right:0;
    flex-direction:column;align-items:stretch;gap:0;
    background:rgba(8,13,22,.98);backdrop-filter:blur(14px);
    border-bottom:1px solid var(--line);
    max-height:0;overflow:hidden;transition:max-height .35s;
  }
  .menu.open{max-height:78vh;overflow-y:auto;padding:10px 0 20px;}
  .menu a{padding:14px 28px;}
  .dropdown{position:static;transform:none;opacity:1;visibility:visible;
    box-shadow:none;border:none;background:transparent;padding-left:16px;display:none;}
  .menu.open .dropdown{display:block;}
  .burger{display:block;}
  .nav-tel{display:none;}
  .g3,.g4,.g2,.numbers{grid-template-columns:1fr;}
  .hero-stats{grid-template-columns:1fr;gap:18px;}
  .section{padding:74px 0;}
  .spec-row{grid-template-columns:1fr;}
  .spec-row div:first-child{padding-bottom:0;}
  .footer-top{grid-template-columns:1fr;gap:28px;}
}

/* ---------- 新闻中心 ---------- */
.filters{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:38px;}
.chip{
  padding:8px 18px;border-radius:999px;font-size:14px;cursor:pointer;
  background:rgba(255,255,255,.04);border:1px solid var(--line);color:#b8c4d8;
  font-family:inherit;transition:.24s;
}
.chip:hover{border-color:var(--brand);color:var(--brand);}
.chip.on{background:linear-gradient(120deg,var(--brand-2),var(--brand));
  border-color:transparent;color:#04121f;font-weight:600;}

.news-list{display:grid;gap:22px;grid-template-columns:repeat(2,minmax(0,1fr));}
.news-item{border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;
  background:linear-gradient(165deg,rgba(20,32,52,.9),rgba(9,14,24,.9));transition:.3s;}
.news-item:hover{transform:translateY(-5px);border-color:rgba(0,210,255,.42);
  box-shadow:0 18px 40px rgba(0,0,0,.42);}
.news-item > a{display:flex;flex-direction:column;height:100%;}
.news-thumb{aspect-ratio:5/3;overflow:hidden;background:#0a1320;}
.news-thumb svg{width:100%;height:100%;}
.news-body{padding:24px 26px 26px;display:flex;flex-direction:column;flex:1;}
.news-meta{display:flex;align-items:center;gap:12px;margin-bottom:12px;}
.news-meta .cat{
  font-size:12px;letter-spacing:.08em;padding:3px 10px;border-radius:4px;
  background:rgba(0,210,255,.12);color:var(--brand);border:1px solid rgba(0,210,255,.26);
}
.news-meta time{font-size:13px;color:#66738a;}
.news-item h3{font-size:18px;margin-bottom:12px;line-height:1.5;}
.news-item:hover h3{color:var(--brand);}
.news-item p{font-size:14px;color:var(--txt-muted);flex:1;}
.news-item .more{margin-top:16px;font-size:13.5px;color:var(--brand);letter-spacing:.06em;}
.pager{display:flex;gap:10px;justify-content:center;margin-top:46px;}

/* 首页新闻预览条 */
.news-strip{display:grid;gap:22px;grid-template-columns:repeat(3,minmax(0,1fr));}

/* ---------- FAQ 手风琴 ---------- */
.faq{border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;}
.faq-item{border-bottom:1px solid var(--line);}
.faq-item:last-child{border-bottom:none;}
.faq-q{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:20px;
  padding:20px 26px;background:none;border:none;cursor:pointer;
  color:var(--txt);font-size:16px;font-family:inherit;font-weight:600;text-align:left;
  transition:.2s;
}
.faq-q:hover{background:rgba(0,210,255,.05);color:var(--brand);}
.faq-q span{font-size:20px;color:var(--brand);transition:transform .3s;flex:none;}
.faq-item.open .faq-q{background:rgba(0,210,255,.07);color:var(--brand);}
.faq-item.open .faq-q span{transform:rotate(45deg);}
.faq-a{max-height:0;overflow:hidden;transition:max-height .38s ease;}
.faq-a p{padding:0 26px 22px;font-size:15px;color:var(--txt-muted);}

/* ---------- 回到顶部 ---------- */
.totop{
  position:fixed;right:26px;bottom:26px;z-index:90;
  width:46px;height:46px;border-radius:50%;
  border:1px solid rgba(0,210,255,.4);background:rgba(11,18,32,.9);
  color:var(--brand);font-size:18px;cursor:pointer;
  opacity:0;visibility:hidden;transform:translateY(10px);transition:.3s;
  backdrop-filter:blur(8px);
}
.totop.show{opacity:1;visibility:visible;transform:none;}
.totop:hover{background:var(--brand);color:#04121f;}

@media (max-width:1024px){
  .news-list{grid-template-columns:1fr;}
  .news-strip{grid-template-columns:1fr;}
}

/* ---------- 产品配图（真实截图） ---------- */
.visual img{
  position:relative;z-index:1;
  display:block;width:100%;height:auto;
  border-radius:10px;
  background:#0a1320;
  box-shadow:0 12px 32px rgba(0,0,0,.4);
  transition:transform .4s cubic-bezier(.4,0,.2,1);
}
/* 竖版小图（如 ePathWaySim / RadarSim）不拉伸，居中留白 */
.visual img.portrait{
  width:auto;max-width:100%;max-height:340px;
  margin:0 auto;object-fit:contain;
}
.visual:has(img){
  padding:18px;
  display:flex;align-items:center;justify-content:center;
}
.news-thumb img{width:100%;height:100%;object-fit:cover;}
.news-thumb{background:#0a1320;}

/* ---------- 二维码：公众号 + 联系人并排 ---------- */
.qr-group{
  display:flex;gap:22px;flex-wrap:wrap;
  margin-top:28px;
}
.qr-item{
  display:flex;flex-direction:column;align-items:center;gap:10px;
}
.qr-label{
  font-size:13px;color:var(--txt-muted);letter-spacing:.06em;
  white-space:nowrap;
}
.qr img{
  display:block;width:120px;height:120px;
  object-fit:contain;
  border-radius:6px;
  background:#fff;
  box-shadow:0 4px 14px rgba(0,0,0,.28);
}
@media (max-width:860px){
  .qr-group{gap:16px;}
  .qr img{width:104px;height:104px;}
}

/* 产品技术专题页排版 */
.doc-lead{font-size:17px;line-height:1.9;color:#dbe4f2;max-width:900px;}
.doc-h{font-size:clamp(20px,2.2vw,26px);margin:58px 0 18px;font-weight:600;color:#eaf2ff;}
.doc-p{font-size:15px;line-height:1.95;color:#a9b6cc;margin-bottom:18px;max-width:900px;}
.doc-p b{color:#dbe4f2;font-weight:500;}
.doc-chain{font-size:13.5px;line-height:1.9;color:#9fd8ff;word-break:break-word;}
.doc code{font-family:var(--font-mono,monospace);font-size:.92em;color:#9fd8ff;}

/* 技术文章卡片 */
.tech-item .news-body{padding-top:30px;}
.tech-item h3{font-size:19px;}
.tech-item .news-meta .cat{background:rgba(10,99,255,.16);color:#8ab4ff;border-color:rgba(10,99,255,.32);}

/* FAQ 分组导航 */
.faq-nav{display:flex;gap:10px;flex-wrap:wrap;margin:26px 0 42px;}
.faq-nav-link{padding:7px 14px;border:1px solid var(--line);border-radius:999px;font-size:13px;color:#b8c4d8;text-decoration:none;transition:.24s;}
.faq-nav-link:hover{border-color:var(--brand);color:var(--brand);}
.faq-a p{margin:0 0 14px;font-size:15px;line-height:1.95;color:#a9b6cc;}
.faq-a p:last-child{margin-bottom:0;}
.faq-a a{color:#9fd8ff;}