:root {
  --brand: #0b5cff;
  --brand-dark: #0a3f9e;
  --brand-soft: #e8f0ff;
  --ink: #10192b;
  --ink-2: #3d4a60;
  --ink-3: #6b7891;
  --line: #e4e8f0;
  --bg: #ffffff;
  --bg-2: #f6f8fc;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(16, 25, 43, 0.08);
  --max: 1200px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

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

.wrap {
  width: 100%;
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 20px;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  letter-spacing: 0.5px;
}

.logo-mark {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--brand), #23c1ff);
  color: #fff;
  display: grid;
  place-items: center;
  font-size: 18px;
  font-weight: 800;
}

.logo-text b { display: block; font-size: 17px; line-height: 1.2; }
.logo-text span { font-size: 11px; color: var(--ink-3); letter-spacing: 2px; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  font-size: 15px;
}

.nav-links a { color: var(--ink-2); }
.nav-links a:hover, .nav-links a.active { color: var(--brand); }

.nav-cta {
  padding: 10px 20px;
  border-radius: 999px;
  background: var(--brand);
  color: #fff !important;
  font-size: 14px;
}
.nav-cta:hover { background: var(--brand-dark); }

.nav-toggle {
  display: none;
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 8px;
  padding: 8px 12px;
  font-size: 16px;
  cursor: pointer;
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  background: linear-gradient(160deg, #071431 0%, #0b2a63 55%, #0b5cff 100%);
  color: #fff;
  overflow: hidden;
}
.hero::after {
  content: "";
  position: absolute;
  right: -120px;
  top: -120px;
  width: 480px;
  height: 480px;
  background: radial-gradient(circle, rgba(35, 193, 255, 0.35), transparent 65%);
}
.hero-inner {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 48px;
  align-items: center;
  padding: 88px 0 96px;
  position: relative;
  z-index: 1;
}
.eyebrow {
  display: inline-block;
  font-size: 13px;
  letter-spacing: 2px;
  padding: 6px 14px;
  border: 1px solid rgba(255, 255, 255, 0.35);
  border-radius: 999px;
  margin-bottom: 22px;
}
.hero h1 {
  font-size: 44px;
  line-height: 1.3;
  margin: 0 0 18px;
  font-weight: 800;
}
.hero h1 em { font-style: normal; color: #7fd7ff; }
.hero p { font-size: 17px; color: rgba(255, 255, 255, 0.82); margin: 0 0 30px; }

.btn-row { display: flex; gap: 14px; flex-wrap: wrap; }
.btn {
  display: inline-block;
  padding: 13px 28px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  transition: 0.2s;
}
.btn-primary { background: #fff; color: var(--brand-dark); }
.btn-primary:hover { transform: translateY(-2px); }
.btn-ghost { border: 1px solid rgba(255, 255, 255, 0.5); color: #fff; }
.btn-ghost:hover { background: rgba(255, 255, 255, 0.12); }
.btn-dark { background: var(--brand); color: #fff; }
.btn-dark:hover { background: var(--brand-dark); }

.hero-figure {
  border-radius: 18px;
  overflow: hidden;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.35);
  border: 1px solid rgba(255, 255, 255, 0.18);
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.18);
  padding: 26px 0 34px;
  position: relative;
  z-index: 1;
}
.hero-stats div b { display: block; font-size: 26px; font-weight: 800; }
.hero-stats div span { font-size: 13px; color: rgba(255, 255, 255, 0.72); }

/* ---------- Sections ---------- */
section { padding: 84px 0; }
.section-alt { background: var(--bg-2); }

.section-head { max-width: 760px; margin-bottom: 44px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.tag {
  color: var(--brand);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 2px;
}
.section-head h2 {
  font-size: 32px;
  margin: 10px 0 14px;
  font-weight: 800;
  line-height: 1.35;
}
.section-head p { color: var(--ink-2); margin: 0; font-size: 16px; }

.grid { display: grid; gap: 24px; }
.g2 { grid-template-columns: repeat(2, 1fr); }
.g3 { grid-template-columns: repeat(3, 1fr); }
.g4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px;
  transition: 0.25s;
}
.card:hover { box-shadow: var(--shadow); transform: translateY(-4px); border-color: #cddaf6; }
.card .ico {
  width: 46px; height: 46px;
  border-radius: 12px;
  background: var(--brand-soft);
  color: var(--brand);
  display: grid; place-items: center;
  font-size: 20px; font-weight: 800;
  margin-bottom: 16px;
}
.card h3 { margin: 0 0 10px; font-size: 18px; }
.card p { margin: 0; color: var(--ink-2); font-size: 15px; }
.card-media {
  margin: -28px -28px 20px;
  height: 170px;
  overflow: hidden;
  border-radius: var(--radius) var(--radius) 0 0;
}
.card-media img { width: 100%; height: 100%; object-fit: cover; }

.product {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 44px;
  align-items: center;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 18px;
  overflow: hidden;
}
.product .media { height: 100%; min-height: 330px; overflow: hidden; }
.product .media img { height: 100%; object-fit: cover; }
.product .body { padding: 40px 40px 40px 0; }
.product.reverse .media { order: 2; }
.product.reverse .body { order: 1; padding: 40px 0 40px 40px; }
.product h3 { font-size: 24px; margin: 8px 0 14px; }
.product p { color: var(--ink-2); margin: 0 0 18px; }

.ul-check { list-style: none; padding: 0; margin: 0 0 24px; }
.ul-check li {
  position: relative;
  padding-left: 26px;
  margin-bottom: 10px;
  color: var(--ink-2);
  font-size: 15px;
}
.ul-check li::before {
  content: "✓";
  position: absolute; left: 0; top: 0;
  color: var(--brand);
  font-weight: 800;
}

.spec-table {
  width: 100%;
  border-collapse: collapse;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  font-size: 15px;
}
.spec-table th, .spec-table td {
  padding: 15px 20px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}
.spec-table th { width: 220px; background: var(--bg-2); color: var(--ink); font-weight: 700; }
.spec-table tr:last-child th, .spec-table tr:last-child td { border-bottom: 0; }

.steps { counter-reset: s; }
.steps .card { position: relative; padding-top: 34px; }
.steps .card::before {
  counter-increment: s;
  content: "0" counter(s);
  position: absolute; top: 20px; right: 24px;
  font-size: 28px; font-weight: 800; color: #dfe6f4;
}

.scene-list { display: flex; flex-wrap: wrap; gap: 12px; }
.scene-list span {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 9px 20px;
  font-size: 14px;
  color: var(--ink-2);
}

.cta {
  background: linear-gradient(120deg, #0b2a63, #0b5cff);
  color: #fff;
  border-radius: 18px;
  padding: 52px 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
  flex-wrap: wrap;
}
.cta h2 { margin: 0 0 8px; font-size: 28px; }
.cta p { margin: 0; color: rgba(255, 255, 255, 0.8); }

/* ---------- Page hero ---------- */
.page-hero {
  background: linear-gradient(140deg, #071431, #0b3c8f);
  color: #fff;
  padding: 66px 0;
}
.page-hero h1 { font-size: 36px; margin: 8px 0 12px; }
.page-hero p { margin: 0; color: rgba(255, 255, 255, 0.8); max-width: 760px; }
.crumb { font-size: 13px; color: rgba(255, 255, 255, 0.65); }
.crumb a:hover { color: #fff; }

/* ---------- Job ---------- */
.job {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 36px;
}
.job-meta { display: flex; flex-wrap: wrap; gap: 10px; margin: 14px 0 26px; }
.job-meta span {
  background: var(--brand-soft);
  color: var(--brand-dark);
  border-radius: 6px;
  padding: 5px 14px;
  font-size: 13px;
}
.job h4 { margin: 26px 0 12px; font-size: 17px; }
.job ol, .job ul { padding-left: 22px; margin: 0; color: var(--ink-2); }
.job li { margin-bottom: 9px; }

/* ---------- Contact ---------- */
.contact-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px;
}
.contact-card b { display: block; font-size: 13px; color: var(--ink-3); letter-spacing: 1px; margin-bottom: 6px; }
.contact-card p { margin: 0; font-size: 17px; font-weight: 600; }

.form { display: grid; gap: 18px; }
.form .row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.field label { display: block; font-size: 14px; margin-bottom: 7px; color: var(--ink-2); }
.field input, .field select, .field textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 12px 14px;
  font-size: 15px;
  font-family: inherit;
  background: #fff;
  color: var(--ink);
}
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none;
  border-color: var(--brand);
  box-shadow: 0 0 0 3px rgba(11, 92, 255, 0.12);
}
.form-tip { font-size: 14px; color: var(--brand-dark); background: var(--brand-soft); border-radius: 10px; padding: 12px 16px; display: none; }

/* ---------- Footer ---------- */
.site-footer {
  background: #071431;
  color: rgba(255, 255, 255, 0.72);
  padding: 58px 0 26px;
  font-size: 14px;
}
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr; gap: 34px; }
.site-footer h5 { color: #fff; font-size: 15px; margin: 0 0 16px; }
.site-footer a:hover { color: #fff; }
.site-footer ul { list-style: none; padding: 0; margin: 0; }
.site-footer li { margin-bottom: 10px; }
.footer-logo { display: flex; align-items: center; gap: 10px; color: #fff; margin-bottom: 14px; }
.copy {
  margin-top: 40px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding-top: 20px;
  display: flex;
  justify-content: space-between;
  gap: 14px;
  flex-wrap: wrap;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.55);
}

/* ---------- Reveal ---------- */
.reveal { opacity: 0; transform: translateY(18px); transition: 0.6s ease; }
.reveal.in { opacity: 1; transform: none; }

/* ---------- Responsive ---------- */
@media (max-width: 980px) {
  .nav-links {
    position: absolute;
    top: 72px; left: 0; right: 0;
    background: #fff;
    border-bottom: 1px solid var(--line);
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: 8px 20px 18px;
    display: none;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 12px 0; width: 100%; }
  .nav-toggle { display: block; }
  .hero-inner { grid-template-columns: 1fr; padding: 60px 0 66px; }
  .hero h1 { font-size: 32px; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); }
  .g3, .g4, .g2 { grid-template-columns: 1fr; }
  .product, .product.reverse { grid-template-columns: 1fr; gap: 0; }
  .product .media, .product.reverse .media { order: 1; min-height: 240px; }
  .product .body, .product.reverse .body { order: 2; padding: 30px 26px 34px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .form .row { grid-template-columns: 1fr; }
  section { padding: 60px 0; }
  .cta { padding: 36px 26px; }
  .spec-table th { width: 130px; }
  .arch-layer { grid-template-columns: 1fr !important; gap: 6px; }
}

/* ---------- Architecture layers ---------- */
.arch { display: grid; gap: 14px; }
.arch-layer {
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: 20px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px 26px;
  align-items: start;
  transition: 0.25s;
}
.arch-layer:hover { box-shadow: var(--shadow); border-color: #cddaf6; }
.arch-layer > b {
  color: var(--brand);
  font-size: 14px;
  letter-spacing: 1px;
  padding-top: 3px;
}
.arch-layer h3 { margin: 0 0 6px; font-size: 17px; }
.arch-layer p { margin: 0; color: var(--ink-2); font-size: 14px; }

/* ---------- Compare table ---------- */
.cmp-wrap { overflow-x: auto; border-radius: var(--radius); }
.cmp-table {
  width: 100%;
  min-width: 640px;
  border-collapse: collapse;
  background: #fff;
  border: 1px solid var(--line);
  font-size: 15px;
}
.cmp-table th, .cmp-table td {
  padding: 13px 18px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}
.cmp-table thead th { background: var(--bg-2); font-weight: 700; }
.cmp-table thead th:first-child { width: 170px; }
.cmp-table tbody th { font-weight: 600; color: var(--ink); }
.cmp-table tr:last-child th, .cmp-table tr:last-child td { border-bottom: 0; }

/* ---------- Duty split ---------- */
.duty { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
@media (max-width: 980px) { .duty { grid-template-columns: 1fr; } }
.duty .card h3 { display: flex; align-items: center; gap: 8px; }

/* ---------- Spec highlight strip ---------- */
.hl-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}
.hl-strip .hl {
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 18px 20px;
  text-align: center;
}
.hl-strip .hl b { display: block; font-size: 22px; color: var(--brand-dark); font-weight: 800; }
.hl-strip .hl span { font-size: 13px; color: var(--ink-3); }
@media (max-width: 980px) { .hl-strip { grid-template-columns: repeat(2, 1fr); } }