/* ====== 全局变量与重置 ====== */
:root{
  --bg-deep:#0a0e27;
  --bg-purple:#1a1145;
  --tech-blue:#00d4ff;
  --tech-blue-2:#5b8def;
  --tech-purple:#b16cff;
  --tech-mint:#3ee0c9;
  --text-main:#eaf0ff;
  --text-mute:#a4b0d8;
  --green:#3ddc97;
  --red:#ff5e7a;
  --glass:rgba(255,255,255,0.06);
  --glass-2:rgba(255,255,255,0.10);
  --border:rgba(255,255,255,0.12);
  --shadow:0 10px 40px rgba(0,0,0,0.45);
  --radius:14px;
}
*{box-sizing:border-box;margin:0;padding:0}
html,body{height:100%}
body{
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", Arial, sans-serif;
  color:var(--text-main);
  background:
    radial-gradient(1200px 800px at 10% -10%, #1f2a78 0%, transparent 60%),
    radial-gradient(1000px 700px at 110% 10%, #5b1f8c 0%, transparent 55%),
    linear-gradient(160deg, var(--bg-deep) 0%, var(--bg-purple) 100%);
  background-attachment: fixed;
  line-height:1.7;
  font-size:15px;
  overflow-x:hidden;
}
a{color:var(--tech-blue);text-decoration:none;transition:color .25s}
a:hover{color:var(--tech-mint)}
img{max-width:100%;display:block;border-radius:8px}
ul{list-style:none}

/* ====== 头部 ====== */
.topbar{
  position:sticky;top:0;z-index:50;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  background: rgba(10,14,39,0.55);
  border-bottom:1px solid var(--border);
}
.nav{
  max-width:1280px;margin:0 auto;padding:14px 22px;
  display:flex;align-items:center;justify-content:space-between;gap:16px;
}
.logo{
  display:flex;align-items:center;gap:10px;font-weight:800;letter-spacing:1px;
  font-size:18px;color:#fff;
}
.logo .dot{
  width:14px;height:14px;border-radius:50%;
  background:linear-gradient(135deg,var(--tech-blue),var(--tech-purple));
  box-shadow:0 0 14px var(--tech-blue);
}
.menu{display:flex;gap:6px;flex-wrap:wrap}
.menu a{
  padding:8px 14px;border-radius:10px;color:var(--text-main);font-size:14px;
}
.menu a:hover,.menu a.active{
  background:var(--glass);color:#fff;
  box-shadow: inset 0 0 0 1px var(--border);
}
.search{
  position:relative;
}
.search input{
  background:var(--glass);
  border:1px solid var(--border);
  color:#fff;border-radius:10px;
  padding:8px 14px;width:220px;font-size:13px;outline:none;
}
.search input::placeholder{color:var(--text-mute)}
.search-status{
  position:absolute;left:0;right:0;top:110%;
  background:rgba(10,14,39,0.95);
  border:1px solid var(--border);border-radius:10px;
  padding:10px 14px;font-size:12px;color:var(--tech-mint);
  display:none;box-shadow:var(--shadow);
}
.search-status.show{display:block}

.hamburger{display:none;background:transparent;border:1px solid var(--border);color:#fff;padding:8px 12px;border-radius:8px;cursor:pointer}

/* breadcrumb */
.breadcrumb{
  max-width:1280px;margin:14px auto 0;padding:0 22px;
  font-size:13px;color:var(--text-mute);
}
.breadcrumb a{color:var(--text-mute)}
.breadcrumb a:hover{color:var(--tech-blue)}

/* ====== ticker 走马灯 ====== */
.ticker{
  border-top:1px solid var(--border);
  border-bottom:1px solid var(--border);
  background: rgba(0,0,0,0.25);
  overflow:hidden;position:relative;
}
.ticker .track{
  display:flex;gap:42px;
  white-space:nowrap;padding:10px 0;
  animation: tickerMove 38s linear infinite;
  width:max-content;
}
.ticker .item{font-size:13px;font-weight:600;letter-spacing:.5px}
.ticker .up{color:var(--green)}
.ticker .down{color:var(--red)}
@keyframes tickerMove{
  0%{transform:translateX(0)}
  100%{transform:translateX(-50%)}
}

/* ====== Hero ====== */
.hero{
  position:relative;overflow:hidden;
  padding:64px 22px 80px;
}
.hero-inner{
  max-width:1280px;margin:0 auto;
  display:grid;grid-template-columns: 1.1fr .9fr;gap:40px;align-items:center;
}
.hero h1{
  font-size:42px;line-height:1.25;font-weight:800;
  background: linear-gradient(120deg,#fff 20%,var(--tech-blue) 60%,var(--tech-purple) 100%);
  -webkit-background-clip:text;background-clip:text;color:transparent;
  margin-bottom:18px;
}
.hero p.lead{font-size:16px;color:var(--text-mute);margin-bottom:22px}
.hero-tags{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:22px}
.tag{
  padding:6px 12px;font-size:12px;border-radius:999px;
  background:var(--glass);border:1px solid var(--border);color:var(--text-main);
}
.cta{
  display:inline-flex;gap:10px;align-items:center;
  padding:12px 22px;border-radius:12px;font-weight:700;
  background: linear-gradient(135deg,var(--tech-blue),var(--tech-purple));
  color:#0a0e27;box-shadow: 0 8px 28px rgba(91,141,239,.45);
}
.cta:hover{transform:translateY(-2px);color:#0a0e27}
.cta.ghost{
  background:transparent;color:#fff;border:1px solid var(--border);box-shadow:none;
  margin-left:10px;
}
.hero-art{
  position:relative;border-radius:20px;overflow:hidden;
  border:1px solid var(--border);background:var(--glass);
  box-shadow:var(--shadow);
}
.hero-art img{width:100%;height:360px;object-fit:cover;border-radius:20px;opacity:.85}

/* ====== Dashboard 数字 ====== */
.dashboard{
  max-width:1280px;margin:-30px auto 60px;padding:0 22px;
  display:grid;grid-template-columns:repeat(4,1fr);gap:18px;
}
.metric{
  padding:22px;border-radius:var(--radius);
  background:var(--glass);border:1px solid var(--border);
  backdrop-filter: blur(8px);
}
.metric .label{font-size:13px;color:var(--text-mute);margin-bottom:6px}
.metric .value{font-size:30px;font-weight:800;color:#fff;letter-spacing:.5px}
.metric .delta{font-size:12px;color:var(--green);margin-top:6px}
.metric .delta.down{color:var(--red)}

/* ====== Section ====== */
.section{padding:70px 22px;max-width:1280px;margin:0 auto}
.sec-head{margin-bottom:30px;text-align:center}
.sec-head .eyebrow{color:var(--tech-mint);font-size:13px;letter-spacing:3px;font-weight:700}
.sec-head h2{font-size:30px;margin:8px 0 8px;color:#fff}
.sec-head p{color:var(--text-mute);max-width:760px;margin:0 auto}

/* news cards */
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.card{
  background:var(--glass);border:1px solid var(--border);
  border-radius:var(--radius);overflow:hidden;backdrop-filter:blur(8px);
  transition: transform .35s, box-shadow .35s;
  display:flex;flex-direction:column;
}
.card:hover{transform:translateY(-4px);box-shadow:0 20px 50px rgba(0,0,0,.35)}
.card .cover{height:180px;overflow:hidden}
.card .cover img{width:100%;height:100%;object-fit:cover;border-radius:0}
.card .body{padding:18px 18px 22px;flex:1;display:flex;flex-direction:column}
.card .body h4{color:#fff;font-size:17px;margin-bottom:10px;line-height:1.5}
.card .body p{color:var(--text-mute);font-size:13.5px;flex:1}
.card .meta{display:flex;justify-content:space-between;color:var(--text-mute);font-size:12px;margin-top:12px}

/* video grid */
.videos{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.video-item{
  position:relative;border-radius:var(--radius);overflow:hidden;
  border:1px solid var(--border);background:#000;cursor:pointer;
}
.video-item img{width:100%;height:200px;object-fit:cover;opacity:.85}
.play-btn{
  position:absolute;inset:0;display:flex;align-items:center;justify-content:center;
}
.play-btn svg{
  width:64px;height:64px;fill:#fff;opacity:.9;
  filter: drop-shadow(0 0 18px rgba(0,212,255,.6));
}
.video-item .title{
  position:absolute;left:14px;right:14px;bottom:12px;color:#fff;font-weight:600;
  text-shadow:0 2px 8px rgba(0,0,0,.6);font-size:14px;
}

/* testimonial carousel */
.testimonials{
  display:grid;grid-template-columns:repeat(3,1fr);gap:22px;
}
.t-card{
  padding:22px;border-radius:var(--radius);
  background:var(--glass-2);border:1px solid var(--border);
}
.t-card .who{display:flex;align-items:center;gap:12px;margin-bottom:12px}
.t-card .who img{width:48px;height:48px;border-radius:50%;object-fit:cover}
.t-card .who .name{color:#fff;font-weight:700}
.t-card .who .role{color:var(--text-mute);font-size:12px}
.t-card .quote{color:var(--text-main);font-size:14px}

/* article body for inner pages */
.article{
  max-width:920px;margin:0 auto;padding:30px 22px 60px;
}
.article h1{
  font-size:30px;color:#fff;line-height:1.35;margin:18px 0 16px;
  background: linear-gradient(120deg,#fff 30%,var(--tech-blue) 100%);
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.article .lead{color:var(--text-mute);margin-bottom:28px;font-size:15.5px}
.article h2{
  color:#fff;font-size:22px;margin:34px 0 14px;
  padding-left:14px;border-left:4px solid var(--tech-blue);
}
.article h3{color:#cfe5ff;font-size:18px;margin:22px 0 10px}
.article h4,.article h5,.article h6{color:#cfe5ff;margin:18px 0 10px}
.article p{color:var(--text-main);margin-bottom:14px}
.article .figure{
  margin:22px 0;border-radius:var(--radius);overflow:hidden;
  border:1px solid var(--border);
}
.article .figure img{width:100%;height:300px;object-fit:cover;border-radius:0}
.article .figure .cap{padding:10px 14px;color:var(--text-mute);font-size:12.5px;background:var(--glass)}

/* footer */
footer{
  margin-top:60px;border-top:1px solid var(--border);
  background: rgba(0,0,0,0.3);
  padding:40px 22px 24px;
}
.footer-inner{
  max-width:1280px;margin:0 auto;
  display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:30px;
}
footer h5{color:#fff;font-size:14px;margin-bottom:14px;letter-spacing:1px}
footer p, footer li{color:var(--text-mute);font-size:13px;margin:6px 0}
.copy{
  text-align:center;color:var(--text-mute);font-size:12px;margin-top:30px;
  border-top:1px solid var(--border);padding-top:16px;
}

/* fade-in */
.fade-in{opacity:0;transform:translateY(18px);transition:opacity .8s ease, transform .8s ease}
.fade-in.visible{opacity:1;transform:translateY(0)}

/* ====== Responsive ====== */
@media (max-width: 960px){
  .hero-inner{grid-template-columns:1fr}
  .hero h1{font-size:30px}
  .hero-art img{height:240px}
  .dashboard{grid-template-columns:repeat(2,1fr)}
  .cards,.videos,.testimonials{grid-template-columns:1fr}
  .footer-inner{grid-template-columns:1fr 1fr}
  .menu{display:none;flex-direction:column;width:100%;background:rgba(10,14,39,.95);position:absolute;top:60px;left:0;padding:12px;border-bottom:1px solid var(--border)}
  .menu.open{display:flex}
  .nav{flex-wrap:wrap;position:relative}
  .hamburger{display:inline-block}
  .search input{width:160px}
}
@media (max-width: 520px){
  .footer-inner{grid-template-columns:1fr}
  .search{order:3;width:100%}
  .search input{width:100%}
}