:root {
  --blue: #0a5bd3;
  --blue-deep: #083a8a;
  --cyan: #19c2ff;
  --ink: #16243a;
  --muted: #5b6b82;
  --line: #e6edf7;
  --bg: #ffffff;
  --bg-alt: #f4f8ff;
  --shadow: 0 18px 40px -22px rgba(10, 91, 211, .45);
  --radius: 16px;
  --maxw: 1120px;
}

@font-face {
  font-family: "Simple-Line-Icons";
  src: url("assets/fonts/Simple-Line-Icons.woff2") format("woff2"),
       url("assets/fonts/Simple-Line-Icons.ttf") format("truetype");
  font-weight: normal;
  font-style: normal;
}

.icon {
  font-family: "Simple-Line-Icons";
  font-style: normal;
  font-weight: normal;
  line-height: 1;
  display: inline-block;
  speak: none;
}
.icon-star::before { content: "\e09b"; }
.icon-social-steam::before { content: "\e620"; }
.icon-calendar::before { content: "\e075"; }
.icon-support::before { content: "\e056"; }

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- 导航 ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, .88);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--line);
  transition: box-shadow .3s;
}
.nav.is-scrolled { box-shadow: 0 6px 24px -16px rgba(0,0,0,.4); }
.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.brand { display: flex; align-items: center; }
.brand img { height: 52px; width: auto; }

.nav__links { display: flex; gap: 26px; }
.nav__links a {
  position: relative;
  font-size: 15px;
  color: var(--muted);
  padding: 6px 0;
  transition: color .2s;
}
.nav__links a::after {
  content: "";
  position: absolute; left: 0; bottom: -2px;
  width: 0; height: 2px; border-radius: 2px;
  background: linear-gradient(90deg, var(--blue), var(--cyan));
  transition: width .25s;
}
.nav__links a:hover { color: var(--blue); }
.nav__links a:hover::after { width: 100%; }

.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 40px; height: 40px;
  border: none; background: none; cursor: pointer;
  justify-content: center; align-items: center;
}
.nav__toggle span {
  width: 22px; height: 2px; background: var(--ink); border-radius: 2px;
  transition: transform .3s, opacity .3s;
}
.nav__toggle.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__toggle.is-open span:nth-child(2) { opacity: 0; }
.nav__toggle.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-block;
  padding: 12px 26px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid transparent;
  transition: transform .2s, box-shadow .2s, background .2s, color .2s;
}
.btn--primary {
  background: linear-gradient(135deg, var(--blue), var(--cyan));
  color: #fff;
  box-shadow: var(--shadow);
}
.btn--primary:hover { transform: translateY(-2px); }
.btn--ghost {
  border-color: rgba(255,255,255,.55);
  color: #fff;
}
.btn--ghost:hover { background: rgba(255,255,255,.12); }
.btn--block { width: 100%; text-align: center; }

/* ---------- 首页 ---------- */
.hero {
  position: relative;
  min-height: 88vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  color: #fff;
}
.hero__bg {
  position: absolute; inset: 0;
  background:
    linear-gradient(180deg, rgba(4,16,38,.62), rgba(4,16,38,.72)),
    url("assets/hero.jpg") center / cover no-repeat;
}
.hero__bg::after {
  content: "";
  position: absolute; inset: 0;
  background:
    radial-gradient(800px 420px at 82% 0%, rgba(25,194,255,.28), transparent 60%),
    radial-gradient(600px 420px at 5% 100%, rgba(10,91,211,.4), transparent 60%);
}
.hero__inner { position: relative; z-index: 1; max-width: 760px; }
.hero__eyebrow {
  display: inline-block;
  font-size: 14px; letter-spacing: 2px;
  padding: 6px 14px;
  border: 1px solid rgba(255,255,255,.3);
  border-radius: 999px;
  margin: 0 0 22px;
  color: #d8ecff;
}
.hero__title {
  font-size: clamp(36px, 6vw, 64px);
  line-height: 1.15;
  margin: 0 0 22px;
  font-weight: 800;
  letter-spacing: .5px;
}
.hero__desc {
  font-size: clamp(16px, 2vw, 19px);
  color: #d7e6ff;
  max-width: 640px;
  margin: 0 0 34px;
}
.hero__actions { display: flex; gap: 16px; flex-wrap: wrap; }
.hero__scroll {
  position: absolute; left: 50%; bottom: 26px; transform: translateX(-50%);
  z-index: 1; color: #fff; font-size: 22px;
  animation: bob 1.8s ease-in-out infinite; opacity: .85;
}
@keyframes bob { 0%,100%{ transform: translate(-50%,0);} 50%{ transform: translate(-50%,8px);} }

/* ---------- 通用区块 ---------- */
.section { padding: 96px 0; }
.section--alt { background: var(--bg-alt); }
.section__head { text-align: center; margin-bottom: 52px; }
.section__tag {
  display: inline-block;
  font-size: 13px; letter-spacing: 3px; font-weight: 700;
  color: var(--blue);
  text-transform: uppercase;
  margin-bottom: 12px;
}
.section__title {
  font-size: clamp(26px, 3.4vw, 38px);
  margin: 0;
  font-weight: 800;
  color: var(--ink);
}
.section__sub {
  max-width: 640px;
  margin: 14px auto 0;
  color: var(--muted);
  font-size: 16px;
}

/* ---------- 核心业务卡片 ---------- */
.cards { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.card {
  display: block;
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 30px 24px; transition: transform .25s, box-shadow .25s, border-color .25s;
}
.card:hover { transform: translateY(-6px); box-shadow: var(--shadow); border-color: transparent; }
.card__icon {
  width: 52px; height: 52px; border-radius: 14px;
  display: grid; place-items: center; margin-bottom: 18px;
  color: var(--blue); background: var(--bg-alt);
}
.card__icon .icon { font-size: 26px; }
.card__title { font-size: 18px; margin: 0 0 10px; }
.card__desc { font-size: 14px; color: var(--muted); margin: 0; }

/* ---------- 图文交替 ---------- */
.feature {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
}
.feature--reverse .feature__media { order: 2; }
.feature__media {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  border: 1px solid var(--line);
  background: #fff;
}
.feature__media img { width: 100%; height: 360px; object-fit: cover; }
.feature__title { font-size: clamp(24px, 3vw, 32px); margin: 0 0 14px; font-weight: 800; }
.feature__desc { color: var(--muted); margin: 0 0 18px; }
.feature__list { list-style: none; padding: 0; margin: 0 0 22px; }
.feature__list li {
  position: relative; padding-left: 28px; margin-bottom: 10px; color: var(--ink);
}
.feature__list li::before {
  content: ""; position: absolute; left: 0; top: 9px;
  width: 12px; height: 12px; border-radius: 4px;
  background: linear-gradient(135deg, var(--blue), var(--cyan));
}

.chips { display: flex; flex-wrap: wrap; gap: 10px; }
.chip {
  font-size: 13px; color: var(--blue);
  background: #fff; border: 1px solid var(--line);
  padding: 6px 14px; border-radius: 999px;
}

/* ---------- 智能硬件双栏 ---------- */
.duo { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; }
.duo__item {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden; transition: transform .25s, box-shadow .25s;
}
.duo__item:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.duo__media img { width: 100%; height: 220px; object-fit: cover; }
.duo__body { padding: 26px; }
.duo__title { font-size: 20px; margin: 0 0 8px; }
.duo__desc { color: var(--muted); font-size: 14px; margin: 0 0 14px; }
.duo__body .feature__list { margin-bottom: 0; }
.duo__body .feature__list li { font-size: 14.5px; }

/* ---------- 案例 ---------- */
.cases { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; margin-top: 56px; }
.case {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden; transition: transform .25s, box-shadow .25s;
}
.case:hover { transform: translateY(-6px); box-shadow: var(--shadow); }
.case__media img { width: 100%; height: 240px; object-fit: cover; }
.case__body { padding: 22px; }
.case__title { font-size: 18px; margin: 0 0 10px; }
.case__desc { font-size: 14px; color: var(--muted); margin: 0 0 14px; }
.case__tag {
  display: inline-block; font-size: 12px; color: var(--blue);
  background: var(--bg-alt); padding: 4px 12px; border-radius: 999px;
}

/* ---------- 物联网流程图 ---------- */
.flow {
  display: flex;
  align-items: stretch;
  justify-content: center;
  gap: 12px;
  margin-bottom: 48px;
}
.flow__step {
  flex: 1;
  max-width: 220px;
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 26px 18px; text-align: center;
  box-shadow: var(--shadow);
}
.flow__num {
  width: 34px; height: 34px; margin: 0 auto 12px;
  display: grid; place-items: center;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--blue), var(--cyan));
  color: #fff; font-weight: 700; font-size: 15px;
}
.flow__title { font-size: 17px; margin: 0 0 8px; }
.flow__desc { font-size: 13.5px; color: var(--muted); margin: 0; }
.flow__arrow {
  align-self: center;
  color: var(--blue); font-size: 24px; font-weight: 700;
}

.values { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.value {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 26px;
}
.value__title { font-size: 17px; margin: 0 0 8px; }
.value__desc { font-size: 14px; color: var(--muted); margin: 0; }

/* ---------- 关于 ---------- */
.about { display: grid; grid-template-columns: 1.4fr 1fr; gap: 48px; align-items: center; }
.about__text p { color: var(--muted); margin: 0 0 16px; }
.vision {
  margin: 22px 0 0;
  padding: 18px 22px;
  border-left: 4px solid var(--blue);
  background: #fff;
  border-radius: 0 var(--radius) var(--radius) 0;
  font-size: 17px;
  font-weight: 600;
  color: var(--ink);
}
.about__stats { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.stat {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 22px; text-align: center; box-shadow: var(--shadow);
}
.stat__num {
  display: block; font-size: 28px; font-weight: 800;
  background: linear-gradient(135deg, var(--blue), var(--cyan));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.stat__label { font-size: 13px; color: var(--muted); }

/* ---------- 联系 ---------- */
.contact { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; }
.contact__info { display: grid; gap: 18px; align-content: start; }
.info-item {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 18px 22px;
}
.info-item__label { display: block; font-size: 13px; color: var(--muted); margin-bottom: 4px; }
.info-item__value { font-size: 16px; font-weight: 600; color: var(--ink); }
a.info-item__value:hover { color: var(--blue); }

.wechat-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 28px; box-shadow: var(--shadow);
  display: grid; grid-template-columns: 200px 1fr; gap: 24px; align-items: center;
}
.wechat-card__qr { width: 200px; height: 200px; border-radius: 14px; }
.wechat-card__body h3 { font-size: 20px; margin: 0 0 10px; }
.wechat-card__body p { font-size: 15px; color: var(--muted); margin: 0 0 18px; line-height: 1.7; }

/* ---------- 页脚 ---------- */
.footer { background: #061a3d; color: #9fb6d6; padding: 26px 0; }
.footer__inner { display: flex; justify-content: space-between; align-items: center; gap: 16px; flex-wrap: wrap; font-size: 14px; }
.footer a { color: #9fb6d6; }
.footer a:hover { color: #fff; }
.footer__badges { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }

/* ---------- 滚动揭示动画 ---------- */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity .6s ease, transform .6s ease; }
.reveal.is-visible { opacity: 1; transform: none; }

/* ---------- 响应式 ---------- */
@media (max-width: 1000px) {
  .cards { grid-template-columns: repeat(2, 1fr); }
  .flow { flex-wrap: wrap; }
  .flow__step { max-width: calc(50% - 30px); }
  .flow__arrow { display: none; }
  .values { grid-template-columns: 1fr; }
}

@media (max-width: 900px) {
  .feature { grid-template-columns: 1fr; gap: 28px; }
  .feature--reverse .feature__media { order: 0; }
  .duo { grid-template-columns: 1fr; }
  .cases { grid-template-columns: 1fr; }
  .about { grid-template-columns: 1fr; gap: 28px; }
  .contact { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .section { padding: 64px 0; }
  .nav__inner { height: 64px; }
  .brand img { height: 40px; }
  .nav__links {
    position: fixed; top: 64px; right: 0; left: 0;
    flex-direction: column; gap: 0;
    background: #fff; border-bottom: 1px solid var(--line);
    padding: 8px 24px 16px;
    transform: translateY(-120%); transition: transform .3s ease;
    box-shadow: 0 16px 30px -24px rgba(0,0,0,.5);
  }
  .nav__links.is-open { transform: translateY(0); }
  .nav__links a { padding: 14px 0; border-bottom: 1px solid var(--line); }
  .nav__toggle { display: flex; }
  .cards { grid-template-columns: 1fr; }
  .about__stats { grid-template-columns: 1fr 1fr; }
  .flow__step { max-width: 100%; }
  .feature__media img { height: 240px; }
  .wechat-card { grid-template-columns: 1fr; justify-items: center; text-align: center; }
  .wechat-card__body p { margin-bottom: 20px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .hero__scroll { animation: none; }
}