:root{
    --bg:#0b1320;
    --bg-2:#0f1b2d;
    --bg-3:#15233a;
    --accent:#4aa8ff;
    --accent-2:#7cc0ff;
    --accent-soft:rgba(74,168,255,.12);
    --text:#eaf1fa;
    --text-2:#9fb0c5;
    --text-3:#6f8299;
    --line:rgba(148,163,184,.16);
    --serif:'Noto Serif SC',Georgia,'Songti SC','SimSun',serif;
    --sans:'Noto Sans SC',-apple-system,BlinkMacSystemFont,'PingFang SC','Microsoft YaHei',sans-serif;
    --radius:14px;
    --nav-h:72px;
    --max:1180px;
  }
  *{margin:0;padding:0;box-sizing:border-box}
  html{scroll-behavior:smooth}
  body{
    font-family:var(--sans);
    background:var(--bg);
    color:var(--text);
    line-height:1.7;
    -webkit-font-smoothing:antialiased;
    overflow-x:hidden;
  }
  ::selection{background:var(--accent-soft);color:var(--text)}
  a{color:inherit;text-decoration:none}
  img{max-width:100%;display:block}
  .wrap{max-width:var(--max);margin:0 auto;padding:0 28px}
  .section{padding:96px 0;position:relative}
  .eyebrow{
    display:inline-block;font-size:13px;letter-spacing:.18em;color:var(--accent);
    font-weight:500;margin-bottom:18px;
  }
  .sec-head{max-width:760px;margin-bottom:56px}
  .sec-title{
    font-family:var(--serif);font-weight:700;font-size:clamp(28px,3.6vw,40px);
    line-height:1.3;letter-spacing:.02em;
  }
  .sec-sub{color:var(--text-2);margin-top:16px;font-size:16px;font-weight:300}

  /* ===== 导航 ===== */
  header{
    position:fixed;top:0;left:0;right:0;z-index:100;height:var(--nav-h);
    display:flex;align-items:center;
    transition:background .3s,box-shadow .3s,border-color .3s;
    border-bottom:1px solid transparent;
  }
  header.scrolled{background:rgba(11,19,32,.85);backdrop-filter:blur(12px);border-color:var(--line);box-shadow:0 8px 30px rgba(0,0,0,.25)}
  .nav-inner{display:flex;align-items:center;justify-content:space-between;width:100%}
  .brand{display:flex;align-items:center;gap:12px}
  .brand-mark{
    width:38px;height:38px;border-radius:10px;flex:none;
    background:linear-gradient(135deg,var(--bg-3),var(--bg-2));
    border:1px solid var(--line);display:grid;place-items:center;
  }
  .brand-name{font-family:var(--serif);font-weight:700;font-size:19px;letter-spacing:.04em}
  .brand-name small{display:block;font-family:var(--sans);font-weight:300;font-size:11px;color:var(--text-2);letter-spacing:.14em;margin-top:2px}
  .nav-links{display:flex;gap:34px;align-items:center}
  .nav-links a{font-size:15px;color:var(--text-2);font-weight:400;transition:color .2s;position:relative}
  .nav-links a:hover{color:var(--text)}
  .nav-cta{
    padding:9px 20px;border-radius:999px;background:var(--accent);color:#04101f !important;
    font-weight:600;font-size:14px;transition:transform .2s,box-shadow .2s,background .2s;
  }
  .nav-cta:hover{background:var(--accent-2);transform:translateY(-1px);box-shadow:0 8px 22px rgba(74,168,255,.35)}
  .menu-btn{display:none;background:none;border:1px solid var(--line);color:var(--text);width:42px;height:42px;border-radius:10px;cursor:pointer;place-items:center}

  /* ===== Hero ===== */
  .hero{
    position:relative;min-height:100vh;display:flex;align-items:center;
    padding:calc(var(--nav-h) + 60px) 0 80px;overflow:hidden;
  }
  .hero-bg{
    position:absolute;inset:0;z-index:-2;
    /*background:url('https://media.doubao.com/space/api/box/stream/download/all_by_mount_point/T87kbbgtJonH0mx9eK9cWbDhnvf') center/cover no-repeat;*/
    background:
    radial-gradient(circle at 18% 20%, rgba(74, 168, 255, 0.28), transparent 42%),
    radial-gradient(circle at 82% 25%, rgba(99, 102, 241, 0.22), transparent 38%),
    linear-gradient(180deg, #0b1224 0%, #101a35 50%, #0b1224 100%);
  }
  .hero-veil{position:absolute;inset:0;z-index:-1;background:linear-gradient(100deg,rgba(11,19,32,.97) 0%,rgba(11,19,32,.86) 42%,rgba(11,19,32,.55) 72%,rgba(11,19,32,.72) 100%)}
  .hero-grid{max-width:var(--max);margin:0 auto;padding:0 28px;width:100%}
  .hero-kicker{display:inline-flex;align-items:center;gap:10px;font-size:13px;letter-spacing:.2em;color:var(--accent);font-weight:500;margin-bottom:26px}
  .hero-kicker::before{content:'';width:30px;height:1px;background:var(--accent)}
  .hero h1{
    font-family:var(--serif);font-weight:900;font-size:clamp(36px,6.2vw,68px);
    line-height:1.18;letter-spacing:.01em;max-width:12em;
  }
  .hero h1 em{font-style:normal;color:var(--accent-2)}
  .hero-sub{max-width:560px;color:var(--text-2);font-weight:300;font-size:clamp(16px,1.8vw,19px);margin-top:26px;line-height:1.85}
  .hero-actions{display:flex;gap:16px;margin-top:40px;flex-wrap:wrap}
  .btn{
    display:inline-flex;align-items:center;gap:9px;padding:14px 30px;border-radius:999px;
    font-family:var(--sans);font-size:15px;font-weight:600;cursor:pointer;transition:transform .2s,box-shadow .2s,background .2s;border:none;
  }
  .btn-primary{background:var(--accent);color:#04101f}
  .btn-primary:hover{background:var(--accent-2);transform:translateY(-2px);box-shadow:0 12px 30px rgba(74,168,255,.35)}
  .btn-ghost{background:transparent;color:var(--text);border:1px solid var(--line)}
  .btn-ghost:hover{border-color:var(--accent);color:var(--accent-2);transform:translateY(-2px)}
  .hero-stats{
    margin-top:64px;display:grid;grid-template-columns:repeat(4,1fr);gap:0;
    border-top:1px solid var(--line);padding-top:34px;max-width:820px;
  }
  .stat .num{font-family:var(--serif);font-weight:700;font-size:34px;color:var(--text);line-height:1.1}
  .stat .num b{color:var(--accent);font-weight:700}
  .stat .lab{font-size:13px;color:var(--text-3);margin-top:8px;letter-spacing:.04em}
  .stat-note{grid-column:1/-1;margin-top:14px;font-size:11px;color:var(--text-3);letter-spacing:.03em}


  /* ===== PC + 手机背景 ===== */

.hero-device-stack {
  position: absolute;
  right: 6%;
  top: 30%;
  width: 720px;
  height: 420px;
  pointer-events: none;
}

/* PC 显示器 */
.hero-pc {
  position: absolute;
  left: 0;
  top: 40px;
  width: 460px;
  height: 290px;
  z-index: 1;
}

.hero-pc-screen {
  width: 100%;
  height: 240px;
  border-radius: 18px;
  background: linear-gradient(160deg, #2a3552, #141a2b);
  border: 10px solid #141a2b;
  box-shadow:
    0 30px 60px rgba(0, 0, 0, 0.55),
    0 0 0 1px rgba(255, 255, 255, 0.06),
    0 20px 40px rgba(74, 168, 255, 0.2);
  overflow: hidden;
}

.hero-pc-screen img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  border-radius: 8px;
}

.hero-pc-base {
  width: 140px;
  height: 50px;
  margin: 0 auto;
  background: linear-gradient(180deg, #1f2a44, #141a2b);
  border-radius: 0 0 14px 14px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
}

/* 手机 */
.hero-phone {
  position: absolute;
  left: 380px;
  top: 0;
  width: 210px;
  height: 420px;
  z-index: 2;
  border-radius: 42px;
  background: linear-gradient(160deg, #2a3552, #141a2b);
  border: 11px solid #141a2b;
  box-shadow:
    0 40px 80px rgba(0, 0, 0, 0.6),
    0 0 0 1px rgba(255, 255, 255, 0.08),
    0 25px 50px rgba(74, 168, 255, 0.28);
  overflow: hidden;
}

.hero-phone-notch {
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 86px;
  height: 20px;
  background: #0b1020;
  border-radius: 0 0 16px 16px;
  z-index: 3;
}

.hero-phone-screen {
  position: absolute;
  inset: 0;
  border-radius: 32px;
  overflow: hidden;
  background: #000;
}

.hero-phone-screen img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

@media (max-width: 900px) {
  .hero-device-stack {
    display: none;
  }

}

  /* ===== 能力条 ===== */
  .capstrip{border-top:1px solid var(--line);border-bottom:1px solid var(--line);background:var(--bg-2)}
  .capstrip-inner{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;padding:26px 0}
  .cap-item{display:flex;align-items:center;gap:14px}
  .cap-item svg{width:26px;height:26px;stroke:var(--accent);flex:none}
  .cap-item b{font-weight:600;font-size:15px;display:block}
  .cap-item span{font-size:13px;color:var(--text-3)}

  /* ===== 业务 ===== */
  .services{background:var(--bg)}
  .svc-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
  .svc-card{
    background:linear-gradient(180deg,var(--bg-2),var(--bg));
    border:1px solid var(--line);border-radius:var(--radius);padding:34px 30px;
    transition:transform .3s,border-color .3s,background .3s;position:relative;overflow:hidden;
  }
  .svc-card::after{content:'';position:absolute;left:0;top:0;width:100%;height:2px;background:var(--accent);opacity:0;transition:opacity .3s}
  .svc-card:hover{transform:translateY(-6px);border-color:rgba(74,168,255,.4);background:var(--bg-3)}
  .svc-card:hover::after{opacity:1}
  .svc-ico{width:54px;height:54px;border-radius:12px;background:var(--accent-soft);border:1px solid rgba(74,168,255,.22);display:grid;place-items:center;margin-bottom:22px}
  .svc-ico svg{width:26px;height:26px;stroke:var(--accent)}
  .svc-card h3{font-family:var(--serif);font-weight:700;font-size:20px;margin-bottom:12px}
  .svc-card p{color:var(--text-2);font-size:14px;font-weight:300;line-height:1.8}

  /* ===== 为什么选我们 ===== */
  .why{background:var(--bg-2);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
  .why-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:22px}
  .why-card{background:var(--bg);border:1px solid var(--line);border-radius:var(--radius);padding:34px 32px;transition:border-color .3s,transform .3s}
  .why-card:hover{border-color:rgba(74,168,255,.4);transform:translateY(-4px)}
  .why-num{font-family:var(--serif);font-weight:700;font-size:15px;color:var(--accent);letter-spacing:.1em;margin-bottom:16px}
  .why-card h3{font-family:var(--serif);font-weight:700;font-size:21px;margin-bottom:12px}
  .why-card p{color:var(--text-2);font-size:14.5px;font-weight:300;line-height:1.85}

  /* ===== 流程时间轴 ===== */
  .flow{background:var(--bg)}
  .timeline{display:grid;grid-template-columns:repeat(3,1fr);gap:0;border-top:1px solid var(--line)}
  .tl-item{padding:40px 30px 0 0;position:relative}
  .tl-dot{width:14px;height:14px;border-radius:50%;background:var(--accent);border:4px solid var(--bg);box-shadow:0 0 0 1px var(--accent);margin-bottom:22px}
  .tl-item .step{font-size:12px;letter-spacing:.16em;color:var(--text-3);font-weight:500}
  .tl-item h3{font-family:var(--serif);font-weight:700;font-size:19px;margin:8px 0 10px}
  .tl-item p{color:var(--text-2);font-size:14px;font-weight:300;line-height:1.8;max-width:340px}

  /* ===== 质量与技术 ===== */
  .quality{background:var(--bg-2);border-top:1px solid var(--line)}
  .tech-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin-bottom:44px}
  .tech-card{border:1px solid var(--line);border-radius:var(--radius);padding:24px;background:var(--bg);transition:border-color .3s}
  .tech-card:hover{border-color:rgba(74,168,255,.4)}
  .tech-card b{font-weight:600;font-size:16px;display:block;margin-bottom:10px}
  .tech-card span{font-size:13px;color:var(--text-3);line-height:1.8;display:block}
  .quality-list{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
  .q-item{display:flex;gap:14px;align-items:flex-start}
  .q-item svg{width:22px;height:22px;stroke:var(--accent);flex:none;margin-top:3px}
  .q-item b{font-weight:600;font-size:16px;display:block;margin-bottom:4px}
  .q-item p{color:var(--text-2);font-size:13.5px;font-weight:300;line-height:1.8}


  /* ===== 案例展示 ===== */
  .cases-inner {
  display: flex;
  flex-direction: column;
  gap: 48px;
}
/* 核心：2行4列网格 */
.cases-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-template-rows: repeat(2, 210px);
  gap: 20px;
}
.case-item {
  position: relative;
  border-radius: 5px;
  overflow: hidden;
  border: 1px solid rgba(255,255,255,0.08);
  transition: 0.35s ease;
}
.case-item img {
  width: 100%;
  height: 150px;
  object-fit: cover;
  transition: 0.4s ease;
}
/* 底部文字遮罩 */
.case-mask {
  position: absolute;
  left:0;
  bottom:0;
  width:100%;
  padding:4px 20px;
  background: linear-gradient(transparent, rgba(8,14,28,0.85));
}
.case-mask h4 {
  margin:0 0 4px;
  color:#fff;
  font-size:16px;
}
.case-mask p {
  margin:0;
  color:#b0bcd4;
  font-size:13px;
}
/* hover效果 */
.case-item:hover{
  transform: translateY(-6px);
  border-color:rgba(74,168,255,0.3);
  box-shadow: 0 16px 32px rgba(74,168,255,0.1);
}
.case-item:hover img{
  scale:1.05;
}

/* 平板适配：4列变2列，自动4行 */
@media (max-width:1200px){
  .cases-grid{
    grid-template-columns: repeat(2,1fr);
    grid-template-rows: auto;
  }
}
/* 手机端：单列 */
@media (max-width:768px){
  .cases-grid{
    grid-template-columns: 1fr;
    grid-template-rows: auto;
  }
}





  /* ===== Footer ===== */
  footer{border-top:1px solid var(--line);background:var(--bg-2);padding:46px 0 40px}
.foot-inner {
  display: grid;
  grid-template-columns: 1fr 1.4fr 0.6fr;
  gap: 40px;
  align-items: start;
  padding: 60px 0 40px;
}
  .foot-brand .brand-name{margin-bottom:10px}
  .foot-brand p{color:var(--text-3);font-size:13px;font-weight:300;max-width:340px}
 .foot-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  text-align: left;
}
  .foot-links h5{font-size:13px;color:var(--text-2);letter-spacing:.1em;margin-bottom:14px;font-weight:500}
  .foot-links a{display:block;color:var(--text-3);font-size:13.5px;margin-bottom:9px;transition:color .2s}
  .foot-links a:hover{color:var(--accent-2)}
  .foot-qr {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  text-align: center;
}

.foot-qr img {
  width: 120px;
  height: 120px;
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: #fff;
  padding: 2px;
  margin-bottom: 10px;
}

.foot-qr span {
  font-size: 13px;
  color: #a9b4cc;
}
  .foot-bottom{border-top:1px solid var(--line);margin-top:38px;padding-top:24px;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap}
  .foot-bottom p{color:var(--text-3);font-size:12.5px}
@media (max-width: 900px) {
  .foot-inner {
    grid-template-columns: 1fr;
    gap: 30px;
  }

  .foot-links {
    grid-template-columns: repeat(3, 1fr);
  }

  .foot-qr {
    flex-direction: row;
    justify-content: flex-start;
    gap: 14px;
    text-align: left;
  }

  .foot-qr img {
    width: 96px;
    height: 96px;
  }
}
  /* ===== 动效 ===== */
  .reveal{opacity:0;transform:translateY(26px);transition:opacity .7s cubic-bezier(.2,.7,.3,1),transform .7s cubic-bezier(.2,.7,.3,1)}
  .reveal.in{opacity:1;transform:none}
  @media(prefers-reduced-motion:reduce){
    .reveal{opacity:1;transform:none;transition:none}
    html{scroll-behavior:auto}
  }

  /* ===== 响应式 ===== */
  @media(max-width:1024px){
    .svc-grid{grid-template-columns:repeat(2,1fr)}
    .tech-grid{grid-template-columns:repeat(2,1fr)}
    .timeline{grid-template-columns:repeat(2,1fr)}
    .hero-stats{grid-template-columns:repeat(2,1fr);row-gap:26px}
    .capstrip-inner{grid-template-columns:repeat(2,1fr);gap:18px}
  }
  @media(max-width:768px){
    .section{padding:72px 0}
    .nav-links{
      position:fixed;top:var(--nav-h);left:0;right:0;flex-direction:column;gap:0;
      background:rgba(11,19,32,.97);backdrop-filter:blur(14px);border-bottom:1px solid var(--line);
      padding:12px 0;transform:translateY(-8px);opacity:0;pointer-events:none;transition:opacity .25s,transform .25s;
    }
    .nav-links.open{transform:none;opacity:1;pointer-events:auto}
    .nav-links a{padding:14px 28px;width:100%}
    .nav-cta{margin:10px 28px;justify-content:center}
    .menu-btn{display:grid}
    .why-grid{grid-template-columns:1fr}
    .quality-list{grid-template-columns:1fr}
  }
  @media(max-width:560px){
    .svc-grid,.tech-grid,.timeline{grid-template-columns:1fr}
    .c-rows{grid-template-columns:1fr}
    .hero-stats{grid-template-columns:1fr 1fr}
    .capstrip-inner{grid-template-columns:1fr}
    .hero-actions .btn{width:100%;justify-content:center}
    .foot-links{gap:26px}
  }
  .hide{display: none;}