/* LIOT 官网 · 科幻主题样式 */
:root {
  --bg: #040B18;
  --bg2: #071226;
  --panel: rgba(13, 28, 54, .62);
  --line: rgba(0, 229, 255, .16);
  --cyan: #00E5FF;
  --violet: #7C4DFF;
  --blue: #2979FF;
  --pink: #FF4081;
  --text: #D7E6F5;
  --muted: #7E93B2;
  --grad: linear-gradient(90deg, var(--cyan), var(--violet));
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", sans-serif;
  line-height: 1.75;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
.wrap { max-width: 1280px; margin: 0 auto; padding: 0 24px; }

#bg-net {
  position: fixed; inset: 0; z-index: -2;
  background:
    radial-gradient(900px 500px at 80% -10%, rgba(124, 77, 255, .14), transparent 60%),
    radial-gradient(800px 500px at 10% 110%, rgba(0, 229, 255, .10), transparent 60%),
    var(--bg);
}

/* ---------- 导航 ---------- */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  backdrop-filter: blur(14px);
  background: rgba(4, 11, 24, .72);
  border-bottom: 1px solid transparent;
  transition: border-color .3s, background .3s;
}
.nav.scrolled { border-bottom-color: var(--line); background: rgba(4, 11, 24, .9); }
.nav-in { display: flex; align-items: center; justify-content: space-between; height: 72px; }
.brand img { height: 34px; filter: drop-shadow(0 0 8px rgba(0, 229, 255, .45)); }
.menu { display: flex; gap: 34px; align-items: center; }
.menu a { font-size: 15px; color: var(--muted); letter-spacing: 1px; position: relative; padding: 6px 0; transition: color .25s; }
.menu a::after {
  content: ""; position: absolute; left: 0; bottom: 0; height: 2px; width: 0;
  background: var(--grad); transition: width .3s; box-shadow: 0 0 8px var(--cyan);
}
.menu a:hover, .menu a.on { color: #EAF7FF; }
.menu a:hover::after, .menu a.on::after { width: 100%; }
.menu .menu-cta {
  color: #04121F; background: var(--grad); padding: 8px 22px; border-radius: 999px;
  font-weight: 600; box-shadow: 0 0 18px rgba(0, 229, 255, .35);
}
.menu .menu-cta::after { display: none; }
.menu-btn { display: none; background: none; border: 0; cursor: pointer; flex-direction: column; gap: 5px; padding: 8px; }
.menu-btn span { display: block; width: 24px; height: 2px; background: var(--cyan); }

/* ---------- 主视觉轮播 ---------- */
.hero { position: relative; height: 100vh; min-height: 640px; overflow: hidden; }
.slide { position: absolute; inset: 0; opacity: 0; transition: opacity 1.1s ease; }
.slide.on { opacity: 1; }
.slide img.bg { width: 100%; height: 100%; object-fit: cover; }
.slide::before {
  content: ""; position: absolute; inset: 0;
  background:
    linear-gradient(90deg, rgba(4,11,24,.88) 0%, rgba(4,11,24,.55) 45%, rgba(4,11,24,.25) 75%, rgba(4,11,24,.45) 100%),
    linear-gradient(180deg, rgba(4,11,24,.55), rgba(4,11,24,.15) 45%, rgba(4,11,24,.92));
}
.slide .cap {
  position: absolute; left: 8%; bottom: 20%; max-width: 720px;
  transform: translateY(30px); opacity: 0; transition: all .9s .3s ease;
}
.slide.on .cap { transform: none; opacity: 1; }
.cap .tag {
  display: inline-block; font-size: 13px; letter-spacing: 4px; color: var(--cyan);
  border: 1px solid var(--line); border-radius: 999px; padding: 6px 18px; margin-bottom: 18px;
  background: rgba(0, 229, 255, .06);
}
.cap h1 {
  font-size: clamp(38px, 5.4vw, 72px); line-height: 1.15; letter-spacing: 4px; color: #F2FAFF;
  text-shadow: 0 0 30px rgba(0, 229, 255, .35);
}
.cap p { font-size: clamp(15px, 1.5vw, 20px); color: #A9C2E0; margin-top: 16px; letter-spacing: 2px; }
.cap .btns { margin-top: 34px; display: flex; gap: 16px; flex-wrap: wrap; }
.btn {
  display: inline-block; padding: 13px 34px; border-radius: 999px; font-weight: 600; letter-spacing: 2px;
  transition: transform .25s, box-shadow .25s; border: 1px solid transparent; cursor: pointer; font-size: 15px;
}
.btn-pri { background: var(--grad); color: #04121F; box-shadow: 0 0 24px rgba(0, 229, 255, .4); }
.btn-pri:hover { transform: translateY(-2px); box-shadow: 0 0 36px rgba(124, 77, 255, .55); }
.btn-ghost { border-color: var(--line); color: var(--cyan); background: rgba(0, 229, 255, .05); }
.btn-ghost:hover { background: rgba(0, 229, 255, .14); }
.dots { position: absolute; bottom: 34px; left: 50%; transform: translateX(-50%); display: flex; gap: 12px; z-index: 5; }
.dots i { width: 34px; height: 4px; border-radius: 2px; background: rgba(255, 255, 255, .18); cursor: pointer; transition: .3s; }
.dots i.on { background: var(--cyan); box-shadow: 0 0 10px var(--cyan); }
.scan {
  position: absolute; left: 0; right: 0; height: 120px; z-index: 2; pointer-events: none;
  background: linear-gradient(180deg, transparent, rgba(0, 229, 255, .07), transparent);
  animation: scan 7s linear infinite;
}
@keyframes scan { 0% { top: -15%; } 100% { top: 110%; } }

/* ---------- 区块通用 ---------- */
.section { padding: 110px 0; position: relative; }
.sec-head { text-align: center; margin-bottom: 64px; }
.sec-head .en { font-size: 13px; letter-spacing: 6px; color: var(--cyan); text-transform: uppercase; }
.sec-head h2 {
  font-size: clamp(28px, 3.4vw, 44px); letter-spacing: 4px; color: #F2FAFF; margin: 12px 0 10px;
}
.sec-head h2 em { font-style: normal; background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.sec-head p { color: var(--muted); font-size: 16px; }

/* 能力卡片 */
.feat-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.feat {
  position: relative; border: 1px solid var(--line); border-radius: 18px; padding: 42px 34px;
  background: var(--panel); backdrop-filter: blur(8px); overflow: hidden;
  transition: transform .35s, box-shadow .35s, border-color .35s;
}
.feat::before {
  content: ""; position: absolute; inset: 0 0 auto 0; height: 3px; background: var(--grad);
  opacity: 0; transition: opacity .35s;
}
.feat:hover { transform: translateY(-8px); border-color: rgba(0, 229, 255, .45); box-shadow: 0 18px 50px rgba(0, 229, 255, .12); }
.feat:hover::before { opacity: 1; }
.feat .ico {
  width: 62px; height: 62px; border-radius: 16px; display: grid; place-items: center; margin-bottom: 22px;
  background: rgba(0, 229, 255, .08); border: 1px solid var(--line); box-shadow: inset 0 0 18px rgba(0, 229, 255, .15);
}
.feat .ico svg { width: 30px; height: 30px; stroke: var(--cyan); fill: none; stroke-width: 1.8; }
.feat h3 { font-size: 21px; letter-spacing: 2px; color: #EAF7FF; margin-bottom: 10px; }
.feat p { color: var(--muted); font-size: 15px; }

/* 数据带 */
.stats { border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); background: rgba(7, 18, 38, .55); }
.stats .wrap { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; padding-top: 54px; padding-bottom: 54px; }
.stat { text-align: center; }
.stat .num { font-size: clamp(38px, 4.4vw, 60px); font-weight: 800; letter-spacing: 2px; background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.stat .num small { font-size: .55em; }
.stat .lab { color: var(--muted); font-size: 14px; letter-spacing: 2px; margin-top: 6px; }

/* 产品卡 */
.prod-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.pcard {
  border: 1px solid var(--line); border-radius: 16px; overflow: hidden; background: var(--panel);
  transition: transform .35s, box-shadow .35s, border-color .35s; display: block;
}
.pcard:hover { transform: translateY(-8px); border-color: rgba(0, 229, 255, .5); box-shadow: 0 20px 46px rgba(0, 0, 0, .45), 0 0 30px rgba(0, 229, 255, .12); }
.pcard .thumb { aspect-ratio: 4 / 3; overflow: hidden; }
.pcard .thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform .6s; }
.pcard:hover .thumb img { transform: scale(1.06); }
.pcard .info { padding: 20px 22px 24px; }
.pcard h3 { font-size: 17px; color: #EAF7FF; letter-spacing: 1px; }
.pcard .sub { font-size: 13px; color: var(--muted); margin-top: 6px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.pcard .cat { display: inline-block; font-size: 12px; color: var(--cyan); border: 1px solid var(--line); border-radius: 999px; padding: 2px 12px; margin-top: 12px; }

/* 方案卡 */
.sol-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 26px; }
.scard {
  position: relative; border-radius: 18px; overflow: hidden; border: 1px solid var(--line);
  min-height: 300px; display: flex; align-items: flex-end; transition: transform .35s, box-shadow .35s;
}
.scard:hover { transform: translateY(-6px); box-shadow: 0 24px 60px rgba(0, 0, 0, .5); }
.scard img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; transition: transform .6s; }
.scard:hover img { transform: scale(1.05); }
.scard::after { content: ""; position: absolute; inset: 0; background: linear-gradient(180deg, transparent 30%, rgba(4, 11, 24, .92)); }
.scard .info { position: relative; z-index: 2; padding: 30px 32px; }
.scard h3 { font-size: 22px; letter-spacing: 2px; color: #F2FAFF; }
.scard p { color: #A9C2E0; font-size: 14px; margin-top: 8px; }
.scard .more { display: inline-block; margin-top: 14px; color: var(--cyan); font-size: 14px; letter-spacing: 2px; }

/* 新闻卡 */
.news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.ncard { border: 1px solid var(--line); border-radius: 16px; overflow: hidden; background: var(--panel); transition: transform .35s, border-color .35s; display: block; }
.ncard:hover { transform: translateY(-6px); border-color: rgba(0, 229, 255, .5); }
.ncard .thumb { aspect-ratio: 16 / 9; overflow: hidden; }
.ncard .thumb img { width: 100%; height: 100%; object-fit: cover; }
.ncard .info { padding: 20px 22px 24px; }
.ncard time { font-size: 12px; color: var(--cyan); letter-spacing: 2px; }
.ncard h3 { font-size: 16px; color: #EAF7FF; margin-top: 8px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.ncard p { font-size: 13px; color: var(--muted); margin-top: 8px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }

/* CTA */
.cta { text-align: center; border: 1px solid var(--line); border-radius: 24px; padding: 80px 30px; background: radial-gradient(600px 260px at 50% 0%, rgba(124, 77, 255, .18), transparent), var(--panel); }
.cta h2 { font-size: clamp(26px, 3vw, 40px); letter-spacing: 3px; color: #F2FAFF; }
.cta p { color: var(--muted); margin: 16px 0 34px; }

/* ---------- 内页头 ---------- */
.page-head { padding: 170px 0 90px; text-align: center; position: relative; overflow: hidden; }
.page-head::before {
  content: ""; position: absolute; inset: 0;
  background: radial-gradient(700px 300px at 50% 0%, rgba(0, 229, 255, .12), transparent);
}
.page-head h1 { font-size: clamp(32px, 4vw, 52px); letter-spacing: 6px; color: #F2FAFF; position: relative; }
.page-head p { color: var(--muted); margin-top: 14px; letter-spacing: 2px; position: relative; }
.page-head .crumb { margin-top: 18px; font-size: 13px; color: var(--muted); position: relative; }
.page-head .crumb a { color: var(--cyan); }

/* 分类筛选 */
.filter { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; margin-bottom: 54px; }
.filter a {
  padding: 9px 26px; border-radius: 999px; border: 1px solid var(--line); color: var(--muted);
  font-size: 14px; letter-spacing: 1px; transition: .25s;
}
.filter a:hover { color: var(--cyan); }
.filter a.on { background: var(--grad); color: #04121F; font-weight: 600; border-color: transparent; box-shadow: 0 0 18px rgba(0, 229, 255, .35); }

/* 详情页 */
.detail { display: grid; grid-template-columns: 1.1fr 1fr; gap: 56px; align-items: start; }
.detail .pic { border: 1px solid var(--line); border-radius: 18px; overflow: hidden; background: var(--panel); }
.detail h1 { font-size: clamp(26px, 2.6vw, 36px); color: #F2FAFF; letter-spacing: 2px; }
.detail .sub { color: var(--cyan); margin: 12px 0 24px; font-size: 16px; }
.spec-tab { width: 100%; border-collapse: collapse; margin: 10px 0 30px; }
.spec-tab td { padding: 12px 16px; border-bottom: 1px solid rgba(0, 229, 255, .1); font-size: 14px; }
.spec-tab td:first-child { color: var(--muted); width: 120px; }
.spec-tab td:last-child { color: #EAF7FF; }
.richtext { color: #B8CBE0; font-size: 15px; }
.richtext p { margin-bottom: 14px; }
.richtext img { border-radius: 12px; margin: 16px 0; }
.richtext h2, .richtext h3 { color: #EAF7FF; margin: 26px 0 12px; }

/* 新闻列表 */
.news-list { display: grid; gap: 22px; }
.nrow {
  display: grid; grid-template-columns: 320px 1fr; gap: 28px; border: 1px solid var(--line);
  border-radius: 16px; overflow: hidden; background: var(--panel); transition: border-color .3s, transform .3s;
}
.nrow:hover { border-color: rgba(0, 229, 255, .5); transform: translateX(6px); }
.nrow .thumb { height: 100%; min-height: 180px; }
.nrow .thumb img { width: 100%; height: 100%; object-fit: cover; }
.nrow .info { padding: 26px 26px 26px 0; }
.nrow time { color: var(--cyan); font-size: 13px; letter-spacing: 2px; }
.nrow h3 { font-size: 20px; color: #EAF7FF; margin: 8px 0 10px; }
.nrow p { color: var(--muted); font-size: 14px; }
.pager { display: flex; gap: 10px; justify-content: center; margin-top: 54px; }
.pager a, .pager span { padding: 8px 16px; border-radius: 8px; border: 1px solid var(--line); color: var(--muted); font-size: 14px; }
.pager .cur { background: var(--grad); color: #04121F; border-color: transparent; font-weight: 700; }
.pager a:hover { color: var(--cyan); }

/* 关于页 */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }
.about-grid .pic { border-radius: 18px; overflow: hidden; border: 1px solid var(--line); box-shadow: 0 0 40px rgba(0, 229, 255, .1); }
.vmv { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-top: 80px; }
.vmv .cell { border: 1px solid var(--line); border-radius: 16px; padding: 38px 30px; text-align: center; background: var(--panel); }
.vmv h3 { color: var(--cyan); letter-spacing: 4px; font-size: 19px; margin-bottom: 12px; }
.vmv p { color: var(--muted); font-size: 14px; }

/* 联系页 */
.contact-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: 50px; align-items: start; }
.cinfo { border: 1px solid var(--line); border-radius: 18px; padding: 38px 34px; background: var(--panel); }
.cinfo .row { display: flex; gap: 16px; padding: 16px 0; border-bottom: 1px solid rgba(0, 229, 255, .1); align-items: center; }
.cinfo .row:last-child { border-bottom: 0; }
.cinfo .k { color: var(--cyan); font-size: 13px; letter-spacing: 2px; width: 64px; flex: none; }
.cinfo .v { color: #EAF7FF; font-size: 15px; }
.form { border: 1px solid var(--line); border-radius: 18px; padding: 38px 34px; background: var(--panel); }
.form input, .form textarea {
  width: 100%; background: #071122; border: 1px solid #1E3A66; border-radius: 10px; color: #E6F2FF;
  padding: 13px 16px; font-size: 15px; margin-bottom: 18px; font-family: inherit;
}
.form input:focus, .form textarea:focus { outline: none; border-color: var(--cyan); box-shadow: 0 0 0 3px rgba(0, 229, 255, .15); }
.form textarea { min-height: 140px; resize: vertical; }
.form .ok-msg { background: rgba(0, 229, 255, .08); border: 1px solid var(--line); color: var(--cyan); border-radius: 10px; padding: 12px 16px; margin-bottom: 18px; font-size: 14px; }

/* ---------- 页脚 ---------- */
.footer { border-top: 1px solid var(--line); background: rgba(4, 11, 24, .85); margin-top: 40px; }
.foot-grid { display: grid; grid-template-columns: 1.6fr 1fr 1.2fr; gap: 40px; padding: 64px 24px 44px; }
.foot-brand p { color: var(--muted); font-size: 14px; margin-top: 18px; max-width: 380px; }
.foot-col h4 { color: #EAF7FF; font-size: 15px; letter-spacing: 3px; margin-bottom: 18px; }
.foot-col a, .foot-col span { display: block; color: var(--muted); font-size: 14px; padding: 5px 0; transition: color .25s; }
.foot-col a:hover { color: var(--cyan); }
.foot-bar { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; border-top: 1px solid rgba(0, 229, 255, .08); padding-top: 22px; padding-bottom: 26px; color: #5B7292; font-size: 13px; }
.foot-domain { color: var(--cyan); letter-spacing: 2px; }

/* 动效 */
.reveal { opacity: 0; transform: translateY(36px); transition: opacity .8s ease, transform .8s ease; }
.reveal.in { opacity: 1; transform: none; }

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .prod-grid { grid-template-columns: repeat(2, 1fr); }
  .feat-grid, .news-grid { grid-template-columns: repeat(2, 1fr); }
  .stats .wrap { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 760px) {
  .menu {
    position: fixed; top: 72px; right: 0; left: 0; flex-direction: column; gap: 0;
    background: rgba(4, 11, 24, .97); border-bottom: 1px solid var(--line);
    max-height: 0; overflow: hidden; transition: max-height .35s;
  }
  .menu.open { max-height: 420px; }
  .menu a { padding: 15px 0; width: 100%; text-align: center; }
  .menu .menu-cta { margin: 12px 0 18px; width: auto; }
  .menu-btn { display: flex; }
  .feat-grid, .news-grid, .sol-grid, .prod-grid, .detail, .about-grid, .contact-grid, .vmv, .foot-grid { grid-template-columns: 1fr; }
  .nrow { grid-template-columns: 1fr; }
  .nrow .info { padding: 0 24px 24px; }
  .section { padding: 72px 0; }
  .cap { left: 6%; right: 6%; }
}