/* ============================================================
   DLLink 数智联 — 官网样式（深色工业科技风）
   品牌色：dodgerblue #1E90FF（禁用 skyblue）
   ============================================================ */
:root {
  --brand: #1E90FF;
  --brand-dim: #1063b8;
  --bg: #0a0e14;
  --bg-2: #0d1420;
  --panel: #111a28;
  --panel-2: #162234;
  --line: #1f2d42;
  --text: #e6edf5;
  --text-2: #9db0c7;
  --text-3: #6b7d94;
  --radius: 12px;
  --maxw: 1180px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

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

/* ---------- 顶部导航 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(10, 14, 20, .82);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
.nav {
  display: flex; align-items: center; justify-content: space-between;
  height: 64px;
}
.logo {
  display: flex; align-items: center; gap: 10px;
  font-size: 20px; font-weight: 700; letter-spacing: .5px;
}
.logo-mark {
  width: 30px; height: 30px; border-radius: 8px;
  background: linear-gradient(135deg, var(--brand), var(--brand-dim));
  display: grid; place-items: center;
  color: #fff; font-size: 15px; font-weight: 800;
}
.logo small {
  font-size: 11px; font-weight: 400; color: var(--text-3);
  display: block; line-height: 1.1; letter-spacing: 2px;
}
.nav-links { display: flex; gap: 6px; align-items: center; }
.nav-links a {
  padding: 8px 16px; border-radius: 8px;
  color: var(--text-2); font-size: 15px;
  transition: .2s;
}
.nav-links a:hover { color: #fff; background: var(--panel); }
.nav-links a.active { color: var(--brand); }
.nav-cta {
  margin-left: 12px;
  padding: 8px 20px !important;
  background: var(--brand); color: #fff !important;
  border-radius: 8px; font-weight: 600;
}
.nav-cta:hover { background: #3aa0ff !important; }
.menu-btn { display: none; background: none; border: 1px solid var(--line); color: var(--text); font-size: 20px; padding: 4px 12px; border-radius: 8px; cursor: pointer; }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding: 90px 0 70px;
  background:
    radial-gradient(1000px 500px at 80% -10%, rgba(30, 144, 255, .14), transparent 60%),
    radial-gradient(700px 400px at 10% 110%, rgba(30, 144, 255, .08), transparent 60%),
    var(--bg-2);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(30,144,255,.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(30,144,255,.05) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse at 50% 0%, #000 30%, transparent 75%);
  pointer-events: none;
}
.hero-grid {
  position: relative;
  display: grid; grid-template-columns: 1.05fr .95fr;
  gap: 48px; align-items: center;
}
.tagline {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 13px; color: var(--brand);
  border: 1px solid rgba(30,144,255,.4);
  background: rgba(30,144,255,.08);
  padding: 5px 14px; border-radius: 999px;
  margin-bottom: 22px; letter-spacing: 1px;
}
.hero h1 {
  font-size: 46px; line-height: 1.25; font-weight: 800;
  margin-bottom: 18px;
}
.hero h1 .accent { color: var(--brand); }
.hero p.lead {
  font-size: 17px; color: var(--text-2); margin-bottom: 32px; max-width: 520px;
}
.btn-row { display: flex; gap: 14px; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 28px; border-radius: 10px;
  font-size: 15px; font-weight: 600;
  transition: .2s; cursor: pointer; border: 1px solid transparent;
}
.btn-primary { background: var(--brand); color: #fff; }
.btn-primary:hover { background: #3aa0ff; transform: translateY(-2px); }
.btn-ghost { border-color: var(--line); color: var(--text); background: transparent; }
.btn-ghost:hover { border-color: var(--brand); color: var(--brand); }

.hero-figure {
  position: relative;
  background: linear-gradient(160deg, #f4f7fb, #dde6f0);
  border-radius: 18px;
  border: 1px solid rgba(255,255,255,.08);
  box-shadow: 0 30px 60px rgba(0,0,0,.5), 0 0 0 1px rgba(30,144,255,.15);
  padding: 18px;
}
.hero-figure img { border-radius: 12px; }
.hero-figure figcaption {
  position: absolute; left: 26px; bottom: 26px;
  background: rgba(10,14,20,.78); backdrop-filter: blur(6px);
  color: var(--text); font-size: 13px;
  padding: 6px 14px; border-radius: 8px;
  border: 1px solid var(--line);
}
.hero-figure figcaption b { color: var(--brand); }

/* ---------- 数据条 ---------- */
.stats {
  display: grid; grid-template-columns: repeat(4, 1fr);
  border-bottom: 1px solid var(--line);
}
.stat {
  padding: 30px 20px; text-align: center;
  border-right: 1px solid var(--line);
}
.stat:last-child { border-right: none; }
.stat .num { font-size: 32px; font-weight: 800; color: var(--brand); }
.stat .num small { font-size: 15px; font-weight: 600; }
.stat .label { font-size: 13px; color: var(--text-3); margin-top: 4px; }

/* ---------- 通用 Section ---------- */
section.block { padding: 80px 0; }
section.block.alt { background: var(--bg-2); border-block: 1px solid var(--line); }
.sec-head { text-align: center; margin-bottom: 52px; }
.sec-head .kicker {
  color: var(--brand); font-size: 13px; letter-spacing: 3px;
  font-weight: 700; text-transform: uppercase;
}
.sec-head h2 { font-size: 34px; margin-top: 10px; font-weight: 800; }
.sec-head p { color: var(--text-2); margin-top: 12px; max-width: 640px; margin-inline: auto; }

/* ---------- 产品卡片 ---------- */
.product-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; }
.product-grid-3 { grid-template-columns: repeat(3, 1fr); gap: 22px; }
.product-grid-3 .product-body { padding: 22px; }
.product-grid-3 .product-body h3 { font-size: 19px; }
.product-grid-3 .product-body p { font-size: 13.5px; }
.product-card { height: 100%; }
.product-card {
  background: var(--panel); border: 1px solid var(--line);
  border-radius: var(--radius); overflow: hidden;
  transition: .25s; display: flex; flex-direction: column;
}
.product-card:hover {
  transform: translateY(-4px);
  border-color: rgba(30,144,255,.55);
  box-shadow: 0 18px 40px rgba(0,0,0,.45);
}
.product-card .img-wrap {
  background: linear-gradient(160deg, #f4f7fb, #dfe8f2);
  padding: 14px;
}
.product-card .img-wrap img { border-radius: 8px; aspect-ratio: 3/2; object-fit: cover; width: 100%; }
.product-body { padding: 26px; display: flex; flex-direction: column; flex: 1; }
.product-body .model { color: var(--brand); font-size: 13px; letter-spacing: 2px; font-weight: 700; }
.product-body h3 { font-size: 24px; margin: 6px 0 10px; }
.product-body p { color: var(--text-2); font-size: 14.5px; flex: 1; }
.spec-chips { display: flex; gap: 8px; flex-wrap: wrap; margin: 16px 0 20px; }
.chip {
  font-size: 12.5px; color: var(--text-2);
  background: var(--panel-2); border: 1px solid var(--line);
  padding: 4px 12px; border-radius: 999px;
}
.chip b { color: var(--brand); font-weight: 700; }
.link-arrow { color: var(--brand); font-size: 14.5px; font-weight: 600; }
.link-arrow:hover { text-decoration: underline; }

/* ---------- 特性卡片 ---------- */
.feature-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.feature {
  background: var(--panel); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 28px 24px;
  transition: .25s;
}
.feature:hover { border-color: rgba(30,144,255,.5); transform: translateY(-3px); }
.feature .icon {
  width: 46px; height: 46px; border-radius: 12px;
  background: rgba(30,144,255,.12); border: 1px solid rgba(30,144,255,.35);
  display: grid; place-items: center; font-size: 22px; margin-bottom: 16px;
}
.feature h3 { font-size: 17px; margin-bottom: 8px; }
.feature p { font-size: 14px; color: var(--text-2); }

/* ---------- 应用场景 ---------- */
.app-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.app-card {
  position: relative; border-radius: var(--radius);
  border: 1px solid var(--line); background: var(--panel);
  padding: 30px 26px; overflow: hidden;
}
.app-card::after {
  content: ""; position: absolute; inset: auto 0 0 0; height: 3px;
  background: linear-gradient(90deg, var(--brand), transparent);
  opacity: 0; transition: .25s;
}
.app-card:hover::after { opacity: 1; }
.app-card .icon { font-size: 28px; margin-bottom: 14px; }
.app-card h3 { font-size: 18px; margin-bottom: 8px; }
.app-card p { font-size: 14px; color: var(--text-2); }

/* ---------- 案例条 ---------- */
.case-strip {
  display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center;
}
.case-strip .img-wrap {
  background: linear-gradient(160deg, #f4f7fb, #dfe8f2);
  border-radius: var(--radius); padding: 14px; border: 1px solid var(--line);
}
.case-strip .img-wrap img { border-radius: 8px; }
.case-points { margin-top: 22px; display: grid; gap: 12px; }
.case-point {
  display: flex; gap: 12px; align-items: flex-start;
  font-size: 14.5px; color: var(--text-2);
}
.case-point .dot {
  flex: none; width: 22px; height: 22px; border-radius: 50%;
  background: rgba(30,144,255,.14); color: var(--brand);
  display: grid; place-items: center; font-size: 12px; font-weight: 700; margin-top: 3px;
}

/* ---------- 参数表 ---------- */
.spec-table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); }
table.spec {
  width: 100%; border-collapse: collapse; font-size: 14.5px; min-width: 560px;
}
table.spec th, table.spec td {
  padding: 13px 18px; text-align: left; border-bottom: 1px solid var(--line);
}
table.spec tr:last-child td { border-bottom: none; }
table.spec thead th {
  background: var(--panel-2); color: var(--text);
  font-size: 13.5px; letter-spacing: .5px;
}
table.spec tbody th { color: var(--text-2); font-weight: 500; width: 34%; background: rgba(255,255,255,.015); }
table.spec td { color: var(--text); }
table.spec td.hi { color: var(--brand); font-weight: 700; }
.model-block { margin-bottom: 56px; }
.model-head { display: flex; align-items: baseline; gap: 14px; margin-bottom: 18px; flex-wrap: wrap; }
.model-head h2 { font-size: 26px; }
.model-head .sub { color: var(--text-3); font-size: 14px; }
.note { font-size: 12.5px; color: var(--text-3); margin-top: 10px; }

/* ---------- CTA ---------- */
.cta-box {
  background:
    radial-gradient(600px 240px at 50% 0%, rgba(30,144,255,.2), transparent 70%),
    var(--panel);
  border: 1px solid var(--line);
  border-radius: 18px;
  text-align: center; padding: 64px 30px;
}
.cta-box h2 { font-size: 30px; margin-bottom: 12px; }
.cta-box p { color: var(--text-2); margin-bottom: 28px; }

/* ---------- 页脚 ---------- */
.site-footer { border-top: 1px solid var(--line); background: var(--bg-2); padding: 56px 0 30px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr; gap: 36px; margin-bottom: 40px; }
.footer-grid h4 { font-size: 15px; margin-bottom: 14px; color: #fff; }
.footer-grid p, .footer-grid a { font-size: 13.5px; color: var(--text-3); display: block; margin-bottom: 8px; }
.footer-grid a:hover { color: var(--brand); }
.footer-brand p { max-width: 280px; }
.copyright {
  border-top: 1px solid var(--line); padding-top: 22px;
  font-size: 12.5px; color: var(--text-3); text-align: center;
}

/* ---------- 联系页 ---------- */
.contact-grid { display: grid; grid-template-columns: 1fr 1.3fr; gap: 32px; }
.contact-card, .form-card {
  background: var(--panel); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 34px 30px;
}
.contact-item { display: flex; gap: 14px; margin-bottom: 24px; }
.contact-item .icon {
  flex: none; width: 42px; height: 42px; border-radius: 10px;
  background: rgba(30,144,255,.12); border: 1px solid rgba(30,144,255,.35);
  display: grid; place-items: center; font-size: 18px;
}
.contact-item h4 { font-size: 14.5px; color: var(--text-2); font-weight: 500; }
.contact-item p { font-size: 15px; color: var(--text); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-bottom: 16px; }
.form-card label { display: block; font-size: 13.5px; color: var(--text-2); margin-bottom: 6px; }
.form-card input, .form-card select, .form-card textarea {
  width: 100%; background: var(--bg-2); border: 1px solid var(--line);
  color: var(--text); border-radius: 8px; padding: 11px 14px;
  font-size: 14.5px; font-family: inherit; outline: none; transition: .2s;
}
.form-card input:focus, .form-card select:focus, .form-card textarea:focus {
  border-color: var(--brand); box-shadow: 0 0 0 3px rgba(30,144,255,.15);
}
.form-card textarea { resize: vertical; min-height: 110px; }
.form-full { width: 100%; margin-top: 8px; }
.form-msg { font-size: 13.5px; margin-top: 14px; color: var(--brand); display: none; }

/* ---------- 关于页 ---------- */
.about-grid { display: grid; grid-template-columns: 1.2fr .8fr; gap: 44px; align-items: center; }
.about-grid p { color: var(--text-2); font-size: 15.5px; margin-bottom: 16px; }
.value-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; margin-top: 44px; }
.value-card { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 26px; }
.value-card h3 { font-size: 17px; color: var(--brand); margin-bottom: 8px; }
.value-card p { font-size: 14px; color: var(--text-2); }
.timeline { margin-top: 20px; display: grid; gap: 0; }
.tl-item { display: flex; gap: 20px; padding: 18px 0; border-bottom: 1px dashed var(--line); }
.tl-item:last-child { border-bottom: none; }
.tl-item .yr { flex: none; width: 64px; color: var(--brand); font-weight: 800; font-size: 17px; }
.tl-item .tx { color: var(--text-2); font-size: 14.5px; padding-top: 2px; }

/* ---------- 响应式 ---------- */
@media (max-width: 960px) {
  .hero-grid, .product-grid, .case-strip, .contact-grid, .about-grid { grid-template-columns: 1fr; }
  .product-grid-3 { grid-template-columns: 1fr 1fr; }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .app-grid, .value-grid { grid-template-columns: 1fr 1fr; }
  .stats { grid-template-columns: 1fr 1fr; }
  .stat:nth-child(2) { border-right: none; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .hero h1 { font-size: 34px; }
  .nav-links {
    display: none; position: absolute; top: 64px; left: 0; right: 0;
    background: var(--bg-2); border-bottom: 1px solid var(--line);
    flex-direction: column; align-items: stretch; padding: 12px 20px;
  }
  .nav-links.open { display: flex; }
  .menu-btn { display: block; }
}
@media (max-width: 560px) {
  .feature-grid, .app-grid, .value-grid, .footer-grid, .product-grid-3 { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .hero { padding: 60px 0 50px; }
  .hero h1 { font-size: 28px; }
  .nav-links { max-height: calc(100vh - 64px); overflow-y: auto; }
}