/* HD-Link · 汇典物联 — corporate site
   Author: HD-Link web team
   No external dependencies. */

:root {
  --ink: #050c16;
  --ink-2: #081321;
  --navy: #0a1a2b;
  --panel: #0d2237;
  --panel-2: #102941;
  --line: rgba(150, 184, 214, 0.16);
  --line-strong: rgba(150, 184, 214, 0.3);
  --text: #e6eef7;
  --muted: #93a9bf;
  --muted-2: #6f879e;
  --cyan: #37d3e5;
  --cyan-2: #18a9c6;
  --cyan-soft: rgba(55, 211, 229, 0.12);
  --amber: #f4b64a;
  --green: #4ade80;
  --light: #f4f7fa;
  --light-2: #eaf0f6;
  --dark-text: #0c1c2c;
  --dark-muted: #52697f;
  --max: 1180px;
  --radius: 18px;
  --radius-sm: 12px;
  --shadow: 0 24px 70px rgba(0, 0, 0, 0.35);
  --font: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Source Han Sans SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "SFMono-Regular", "JetBrains Mono", Consolas, "Liberation Mono", monospace;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 92px;
}

body {
  margin: 0;
  background: var(--ink);
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

::selection { background: rgba(55, 211, 229, 0.28); color: #fff; }

a { color: inherit; text-decoration: none; }
img, svg { display: block; max-width: 100%; }
button, input, textarea { font: inherit; }
button { cursor: pointer; }

.container {
  width: min(var(--max), calc(100% - 48px));
  margin-inline: auto;
}

.skip-link {
  position: fixed;
  left: 16px;
  top: -100px;
  z-index: 200;
  padding: 10px 16px;
  border-radius: 8px;
  background: var(--cyan);
  color: #04121e;
  font-weight: 700;
  transition: top 0.2s ease;
}
.skip-link:focus { top: 16px; }

/* ---------- Header ---------- */

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 100;
  transition: background 0.25s ease, border-color 0.25s ease, backdrop-filter 0.25s ease;
  border-bottom: 1px solid transparent;
}
.site-header.is-scrolled,
.site-header.is-open {
  background: rgba(5, 12, 22, 0.86);
  border-bottom-color: var(--line);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 78px;
  gap: 28px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex: none;
}
.brand-mark { height: 44px; width: auto; display: block; }
.brand-text { display: flex; flex-direction: column; gap: 4px; }
.brand-cn { font-size: 20px; font-weight: 700; letter-spacing: 0.06em; line-height: 1; color: var(--text); }
.brand-en { font-family: var(--mono); font-size: 9px; letter-spacing: 0.26em; line-height: 1; color: var(--muted-2); }
.site-footer .brand-mark { height: 40px; }
.site-footer .brand-cn { font-size: 19px; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.nav-links a {
  display: inline-block;
  padding: 9px 14px;
  border-radius: 8px;
  color: var(--muted);
  font-size: 14.5px;
  transition: color 0.18s ease, background 0.18s ease;
}
.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--text);
  background: rgba(255, 255, 255, 0.05);
}

.nav-actions { display: flex; align-items: center; gap: 10px; flex: none; }

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: transparent;
  color: var(--text);
  align-items: center;
  justify-content: center;
}
.nav-toggle span {
  position: relative;
  display: block;
  width: 18px;
  height: 1.5px;
  background: currentColor;
  transition: 0.2s ease;
}
.nav-toggle span::before,
.nav-toggle span::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 1.5px;
  background: currentColor;
  transition: 0.2s ease;
}
.nav-toggle span::before { top: -6px; }
.nav-toggle span::after { top: 6px; }
.site-header.is-open .nav-toggle span { background: transparent; }
.site-header.is-open .nav-toggle span::before { top: 0; transform: rotate(45deg); }
.site-header.is-open .nav-toggle span::after { top: 0; transform: rotate(-45deg); }

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  min-height: 46px;
  padding: 0 22px;
  border-radius: 10px;
  border: 1px solid transparent;
  font-size: 14.5px;
  font-weight: 600;
  letter-spacing: 0.01em;
  transition: transform 0.18s ease, background 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease;
  white-space: nowrap;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary {
  background: linear-gradient(135deg, var(--cyan) 0%, #1fb4cf 100%);
  color: #041320;
  box-shadow: 0 10px 30px rgba(55, 211, 229, 0.22);
}
.btn-primary:hover { box-shadow: 0 14px 36px rgba(55, 211, 229, 0.34); }
.btn-ghost {
  border-color: var(--line-strong);
  color: var(--text);
  background: rgba(255, 255, 255, 0.02);
}
.btn-ghost:hover { border-color: var(--cyan); background: var(--cyan-soft); }
.btn-light {
  background: #0b1c2d;
  color: #fff;
}
.btn-light:hover { background: #10283e; }
.btn svg { width: 17px; height: 17px; }

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: var(--cyan);
  font-size: 14px;
  font-weight: 600;
}
.text-link svg { width: 16px; height: 16px; transition: transform 0.18s ease; }
.text-link:hover svg { transform: translateX(3px); }

/* ---------- Shared type ---------- */

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin: 0 0 18px;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
}
.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: var(--cyan);
  opacity: 0.75;
}

h1, h2, h3, h4 {
  margin: 0;
  font-weight: 650;
  letter-spacing: -0.02em;
  line-height: 1.22;
}
h1 { font-size: clamp(38px, 5.4vw, 66px); font-weight: 700; }
h2 { font-size: clamp(28px, 3.5vw, 42px); }
h3 { font-size: 20px; }
p { margin: 0; }

.lead {
  color: var(--muted);
  font-size: 17px;
  line-height: 1.8;
}

.section { padding: 104px 0; position: relative; }
.section-tight { padding: 78px 0; }
.section-head { max-width: 720px; margin-bottom: 48px; }
.section-head.center { margin-inline: auto; text-align: center; }
.section-head.center .eyebrow { justify-content: center; }
.section-head.center .eyebrow::before { display: none; }
.section-head h2 { margin-bottom: 16px; }
.section-head p { color: var(--muted); font-size: 16.5px; }

.section-light {
  background: var(--light);
  color: var(--dark-text);
}
.section-light .lead,
.section-light .section-head p { color: var(--dark-muted); }
.section-light .eyebrow { color: #0a94ad; }
.section-light .eyebrow::before { background: #0a94ad; }

.grid { display: grid; gap: 20px; }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

/* ---------- Hero ---------- */

.hero {
  position: relative;
  padding: 168px 0 96px;
  min-height: 760px;
  display: flex;
  align-items: center;
  overflow: hidden;
  background:
    radial-gradient(900px 520px at 78% 22%, rgba(24, 169, 198, 0.18), transparent 62%),
    radial-gradient(700px 500px at 12% 88%, rgba(55, 211, 229, 0.08), transparent 60%),
    linear-gradient(180deg, #050c16 0%, #071422 58%, #050c16 100%);
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(150, 184, 214, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(150, 184, 214, 0.055) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 85% 70% at 55% 35%, #000 20%, transparent 78%);
  -webkit-mask-image: radial-gradient(ellipse 85% 70% at 55% 35%, #000 20%, transparent 78%);
  pointer-events: none;
}
.hero::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 0;
  width: 1px;
  height: 100%;
  background: linear-gradient(180deg, transparent, rgba(55, 211, 229, 0.18), transparent);
  pointer-events: none;
}
.hero .container {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
  gap: 56px;
  align-items: center;
}
.hero-copy { max-width: 620px; }
.hero h1 { margin-bottom: 24px; }
.hero h1 .accent {
  color: var(--cyan);
  background: linear-gradient(100deg, var(--cyan), #7ce8f2);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero .lead { max-width: 540px; margin-bottom: 34px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 44px; }

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 26px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
}
.hero-meta span { display: inline-flex; align-items: center; gap: 8px; }
.hero-meta i {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(55, 211, 229, 0.1);
}

.hero-visual {
  position: relative;
  min-height: 470px;
}
.topology {
  width: 100%;
  height: auto;
  overflow: visible;
  filter: drop-shadow(0 20px 60px rgba(0, 0, 0, 0.35));
}
.topology .orb { animation: orbPulse 4.5s ease-in-out infinite; transform-origin: center; }
.topology .orb.d1 { animation-delay: 0.8s; }
.topology .orb.d2 { animation-delay: 1.6s; }
.topology .orb.d3 { animation-delay: 2.4s; }
.topology .dash {
  stroke-dasharray: 5 9;
  animation: dashFlow 1.8s linear infinite;
}
.topology .dash.slow { animation-duration: 2.8s; }
.topology .float { animation: floatY 7s ease-in-out infinite; }
.topology .float.d1 { animation-delay: 1.2s; }
.topology .float.d2 { animation-delay: 2.2s; }

.hero-badge {
  position: absolute;
  left: 2%;
  bottom: 4%;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(8, 19, 33, 0.86);
  backdrop-filter: blur(10px);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.32);
  font-size: 12.5px;
  color: var(--muted);
}
.hero-badge b { display: block; color: var(--text); font-size: 13.5px; font-weight: 600; }
.hero-badge .dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 5px rgba(74, 222, 128, 0.12);
  animation: blink 2.4s ease-in-out infinite;
}

/* ---------- Logo strip ---------- */

.strip {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: #06101c;
}
.strip-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 24px 0;
  flex-wrap: wrap;
}
.strip-label {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--muted-2);
  text-transform: uppercase;
}
.strip-items { display: flex; gap: 10px 28px; flex-wrap: wrap; color: var(--muted); font-size: 14px; }
.strip-items span { display: inline-flex; align-items: center; gap: 8px; }
.strip-items svg { width: 16px; height: 16px; color: var(--cyan); opacity: 0.85; }

/* ---------- Capability cards ---------- */

.platform-grid { align-items: stretch; }
.cap-card {
  position: relative;
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(160deg, rgba(16, 41, 65, 0.55), rgba(8, 19, 33, 0.4));
  transition: border-color 0.22s ease, transform 0.22s ease, background 0.22s ease;
  overflow: hidden;
}
.cap-card::after {
  content: "";
  position: absolute;
  inset: auto -40% -70% auto;
  width: 180px;
  height: 180px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(55, 211, 229, 0.1), transparent 65%);
  opacity: 0;
  transition: opacity 0.25s ease;
}
.cap-card:hover { transform: translateY(-3px); border-color: rgba(55, 211, 229, 0.4); }
.cap-card:hover::after { opacity: 1; }
.icon-box {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  margin-bottom: 18px;
  border: 1px solid rgba(55, 211, 229, 0.24);
  border-radius: 11px;
  background: var(--cyan-soft);
  color: var(--cyan);
}
.icon-box svg { width: 22px; height: 22px; }
.cap-card h3 { font-size: 17px; margin-bottom: 8px; }
.cap-card p { color: var(--muted); font-size: 14px; line-height: 1.75; }
.cap-tag {
  display: inline-block;
  margin-top: 16px;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.08em;
  color: var(--muted-2);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 3px 9px;
}

/* ---------- Product cards ---------- */

.product-card {
  display: flex;
  flex-direction: column;
  padding: 28px;
  border: 1px solid rgba(15, 45, 70, 0.12);
  border-radius: var(--radius);
  background: #fff;
  box-shadow: 0 1px 0 rgba(12, 28, 44, 0.03);
  transition: transform 0.22s ease, box-shadow 0.22s ease, border-color 0.22s ease;
}
.product-card:hover {
  transform: translateY(-4px);
  border-color: rgba(24, 169, 198, 0.32);
  box-shadow: 0 18px 44px rgba(15, 45, 70, 0.12);
}
.product-top { display: flex; align-items: flex-start; justify-content: space-between; gap: 14px; margin-bottom: 20px; }
.product-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: #eaf7fa;
  color: #0a94ad;
}
.product-icon svg { width: 24px; height: 24px; }
.product-index { font-family: var(--mono); font-size: 11px; color: #8aa0b4; letter-spacing: 0.08em; }
.product-card h3 { color: var(--dark-text); font-size: 19px; margin-bottom: 9px; }
.product-card p { color: var(--dark-muted); font-size: 14px; line-height: 1.75; flex: 1; }
.product-tags { display: flex; flex-wrap: wrap; gap: 7px; margin: 18px 0 20px; }
.product-tags span {
  font-size: 11.5px;
  color: #3d5a73;
  background: #f0f5f9;
  border-radius: 999px;
  padding: 4px 10px;
}
.product-card .text-link { color: #0a94ad; margin-top: auto; }

/* ---------- Solutions ---------- */

.solution-grid { align-items: stretch; }
.solution-card {
  position: relative;
  display: flex;
  flex-direction: column;
  min-height: 300px;
  padding: 30px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  overflow: hidden;
  background: linear-gradient(160deg, #0e2438, #081724);
  transition: transform 0.22s ease, border-color 0.22s ease;
}
.solution-card:hover { transform: translateY(-4px); border-color: rgba(55, 211, 229, 0.4); }
.solution-card .num {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--cyan);
  letter-spacing: 0.12em;
  margin-bottom: 46px;
}
.solution-card h3 { margin-bottom: 12px; font-size: 21px; }
.solution-card p { color: var(--muted); font-size: 14px; line-height: 1.8; }
.solution-card .chips { display: flex; flex-wrap: wrap; gap: 7px; margin-top: auto; padding-top: 22px; }
.solution-card .chips span {
  font-size: 11.5px;
  color: #b8cde0;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 4px 9px;
}
.solution-card::before {
  content: "";
  position: absolute;
  right: -55px;
  top: -55px;
  width: 160px;
  height: 160px;
  border-radius: 50%;
  border: 1px solid rgba(55, 211, 229, 0.14);
  box-shadow: 0 0 0 26px rgba(55, 211, 229, 0.025), 0 0 0 52px rgba(55, 211, 229, 0.018);
}

/* ---------- Split / value ---------- */

.split {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
  gap: 64px;
  align-items: center;
}
.value-list { margin: 30px 0 0; padding: 0; list-style: none; display: grid; gap: 18px; }
.value-list li { display: flex; gap: 14px; align-items: flex-start; }
.value-list .tick {
  flex: none;
  width: 22px;
  height: 22px;
  margin-top: 2px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: rgba(55, 211, 229, 0.14);
  color: var(--cyan);
}
.value-list .tick svg { width: 13px; height: 13px; }
.value-list b { display: block; font-size: 15.5px; font-weight: 600; margin-bottom: 2px; }
.value-list span { color: var(--muted); font-size: 14px; }
.section-light .value-list span { color: var(--dark-muted); }
.section-light .value-list .tick { background: #e2f5f8; color: #0a94ad; }

.diagram {
  position: relative;
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 22px;
  background:
    radial-gradient(560px 300px at 60% 30%, rgba(55, 211, 229, 0.08), transparent 65%),
    #08131f;
  box-shadow: var(--shadow);
}
.diagram svg { width: 100%; height: auto; }
.diagram-caption {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  color: var(--muted-2);
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.06em;
}

/* ---------- Stats ---------- */

.stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: rgba(10, 26, 43, 0.55);
}
.stat { padding: 26px 24px; border-right: 1px solid var(--line); }
.stat:last-child { border-right: 0; }
.stat b {
  display: block;
  font-size: clamp(20px, 2.1vw, 27px);
  font-weight: 650;
  color: var(--text);
  letter-spacing: -0.02em;
  margin-bottom: 4px;
}
.stat span { color: var(--muted); font-size: 13px; }
.stat i { display: block; width: 26px; height: 2px; background: var(--cyan); margin-bottom: 16px; opacity: 0.7; }

/* ---------- About / CTA ---------- */

.about-band {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: 60px;
  align-items: center;
}
.about-points { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 28px; }
.about-point {
  padding: 18px;
  border: 1px solid rgba(12, 28, 44, 0.1);
  border-radius: 12px;
  background: #fff;
}
.about-point b { display: block; font-size: 14.5px; color: var(--dark-text); margin-bottom: 4px; }
.about-point span { font-size: 12.8px; color: var(--dark-muted); line-height: 1.65; }
.about-visual { position: relative; }
.about-visual .panel {
  padding: 24px;
  border-radius: 20px;
  background: #0a1a2b;
  box-shadow: 0 24px 60px rgba(12, 28, 44, 0.18);
  color: var(--text);
}
.about-visual .panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 14px;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.1em;
}
.about-visual .panel-head .live { color: var(--green); display: inline-flex; align-items: center; gap: 7px; }
.about-visual .panel-head .live::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 4px rgba(74, 222, 128, 0.12);
}
.metric-row { display: flex; justify-content: space-between; align-items: baseline; padding: 11px 0; border-bottom: 1px dashed var(--line); font-size: 13px; }
.metric-row:last-child { border-bottom: 0; }
.metric-row span { color: var(--muted); }
.metric-row b { font-family: var(--mono); font-weight: 500; color: var(--cyan); }
.metric-row em { font-style: normal; color: var(--muted-2); font-size: 11px; margin-left: 8px; }

.cta {
  position: relative;
  padding: 64px;
  border-radius: 24px;
  overflow: hidden;
  background:
    radial-gradient(600px 300px at 82% 20%, rgba(55, 211, 229, 0.22), transparent 62%),
    linear-gradient(130deg, #0b2033, #07131f);
  border: 1px solid rgba(55, 211, 229, 0.22);
}
.cta::after {
  content: "";
  position: absolute;
  right: -80px;
  bottom: -120px;
  width: 360px;
  height: 360px;
  border-radius: 50%;
  border: 1px solid rgba(55, 211, 229, 0.16);
  box-shadow: 0 0 0 40px rgba(55, 211, 229, 0.025), 0 0 0 80px rgba(55, 211, 229, 0.015);
}
.cta-inner {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 36px;
}
.cta h2 { font-size: clamp(26px, 3vw, 36px); margin-bottom: 10px; }
.cta p { color: var(--muted); font-size: 15.5px; }
.cta-actions { display: flex; flex-wrap: wrap; gap: 12px; flex: none; }

/* ---------- Page hero ---------- */

.page-hero {
  position: relative;
  padding: 158px 0 72px;
  overflow: hidden;
  background:
    radial-gradient(800px 420px at 80% 10%, rgba(24, 169, 198, 0.16), transparent 65%),
    linear-gradient(180deg, #050c16, #071422);
  border-bottom: 1px solid var(--line);
}
.page-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(150, 184, 214, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(150, 184, 214, 0.05) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: linear-gradient(180deg, #000, transparent);
  -webkit-mask-image: linear-gradient(180deg, #000, transparent);
  pointer-events: none;
}
.page-hero .container { position: relative; z-index: 1; }
.page-hero h1 { font-size: clamp(34px, 4.4vw, 54px); margin-bottom: 18px; }
.page-hero p { max-width: 680px; color: var(--muted); font-size: 17px; }
.anchor-nav { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 32px; }
.anchor-nav a {
  padding: 8px 15px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  font-size: 13px;
  transition: border-color 0.18s ease, color 0.18s ease, background 0.18s ease;
}
.anchor-nav a:hover { border-color: var(--cyan); color: var(--text); background: var(--cyan-soft); }
.breadcrumb {
  display: flex;
  gap: 8px;
  align-items: center;
  margin-bottom: 22px;
  color: var(--muted-2);
  font-size: 12.5px;
  font-family: var(--mono);
  letter-spacing: 0.04em;
}
.breadcrumb a:hover { color: var(--cyan); }
.breadcrumb span { opacity: 0.5; }

/* ---------- Product detail ---------- */

.product-detail {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: 56px;
  align-items: start;
  padding: 70px 0;
  border-bottom: 1px solid var(--line);
}
.product-detail:last-of-type { border-bottom: 0; }
.product-detail h2 { font-size: clamp(26px, 3vw, 36px); margin-bottom: 14px; }
.product-detail .lead { font-size: 15.5px; margin-bottom: 24px; }
.spec-list { display: grid; grid-template-columns: 1fr 1fr; gap: 10px 22px; margin: 22px 0 0; padding: 0; list-style: none; }
.spec-list li { font-size: 13.5px; color: var(--muted); padding-left: 16px; position: relative; }
.spec-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 5px;
  height: 5px;
  border-radius: 1px;
  background: var(--cyan);
  opacity: 0.7;
}
.detail-visual {
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background:
    radial-gradient(420px 260px at 60% 30%, rgba(55, 211, 229, 0.1), transparent 65%),
    #08131f;
}
.detail-visual svg { width: 100%; height: auto; }
.detail-visual .caption {
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  color: var(--muted-2);
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.05em;
}
.section-light .product-detail { border-bottom-color: rgba(12, 28, 44, 0.1); }
.section-light .product-detail .lead,
.section-light .spec-list li { color: var(--dark-muted); }
.section-light .detail-visual { border-color: rgba(12, 28, 44, 0.1); }

/* ---------- Solution detail ---------- */

.case-card {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  gap: 42px;
  padding: 38px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(160deg, rgba(16, 41, 65, 0.45), rgba(8, 19, 33, 0.3));
}
.case-card + .case-card { margin-top: 18px; }
.case-index { font-family: var(--mono); color: var(--cyan); font-size: 11px; letter-spacing: 0.12em; margin-bottom: 14px; }
.case-card h3 { font-size: 23px; margin-bottom: 10px; }
.case-card p { color: var(--muted); font-size: 14px; line-height: 1.8; }
.case-points { display: grid; gap: 12px; margin: 0; padding: 0; list-style: none; }
.case-points li {
  padding: 13px 16px;
  border-left: 2px solid rgba(55, 211, 229, 0.45);
  background: rgba(55, 211, 229, 0.04);
  border-radius: 0 8px 8px 0;
  font-size: 13.5px;
  color: #c2d4e4;
}
.case-points li b { color: var(--text); font-weight: 600; }

/* ---------- About page ---------- */

.timeline { margin: 0; padding: 0; list-style: none; border-left: 1px solid var(--line-strong); }
.timeline li { position: relative; padding: 0 0 32px 30px; }
.timeline li:last-child { padding-bottom: 0; }
.timeline li::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 9px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 5px rgba(55, 211, 229, 0.1);
}
.timeline time { display: block; font-family: var(--mono); font-size: 11px; color: var(--cyan); letter-spacing: 0.08em; margin-bottom: 6px; }
.timeline b { display: block; font-size: 16px; margin-bottom: 4px; }
.timeline span { color: var(--muted); font-size: 13.5px; }

/* ---------- Contact ---------- */

.contact-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  gap: 56px;
  align-items: start;
}
.contact-card {
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(160deg, rgba(16, 41, 65, 0.5), rgba(8, 19, 33, 0.35));
}
.contact-row { padding: 17px 0; border-bottom: 1px solid var(--line); }
.contact-row:last-child { border-bottom: 0; padding-bottom: 0; }
.contact-row:first-child { padding-top: 0; }
.contact-row span { display: block; color: var(--muted-2); font-size: 11.5px; font-family: var(--mono); letter-spacing: 0.08em; margin-bottom: 6px; }
.contact-row b { font-size: 15px; font-weight: 600; }
.contact-row a { color: var(--cyan); }
.contact-row p { color: var(--muted); font-size: 13.5px; margin-top: 4px; }

.form {
  padding: 32px;
  border: 1px solid rgba(12, 28, 44, 0.12);
  border-radius: var(--radius);
  background: #fff;
  box-shadow: 0 18px 50px rgba(15, 45, 70, 0.08);
}
.form h3 { color: var(--dark-text); font-size: 21px; margin-bottom: 6px; }
.form > p { color: var(--dark-muted); font-size: 13.5px; margin-bottom: 24px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.field { margin-bottom: 16px; }
.field label { display: block; font-size: 12.5px; font-weight: 600; color: #334c63; margin-bottom: 7px; }
.field input,
.field textarea,
.field select {
  width: 100%;
  padding: 12px 13px;
  border: 1px solid #d8e2eb;
  border-radius: 9px;
  background: #f9fbfd;
  color: var(--dark-text);
  font-size: 14px;
  outline: none;
  transition: border-color 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
}
.field textarea { resize: vertical; min-height: 118px; }
.field input:focus,
.field textarea:focus,
.field select:focus {
  border-color: #18a9c6;
  background: #fff;
  box-shadow: 0 0 0 3px rgba(24, 169, 198, 0.12);
}
.form-note { color: #7b90a4; font-size: 11.5px; margin-top: 12px; }
.form-status { margin-top: 12px; font-size: 13px; color: #0a94ad; min-height: 20px; }

/* ---------- Footer ---------- */

.site-footer {
  border-top: 1px solid var(--line);
  background: #040a12;
  padding: 56px 0 28px;
}
.footer-top {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 42px;
  padding-bottom: 42px;
  border-bottom: 1px solid var(--line);
}
.footer-brand p { color: var(--muted); font-size: 13px; max-width: 280px; margin-top: 16px; line-height: 1.8; }
.footer-col h4 { font-size: 12px; font-family: var(--mono); letter-spacing: 0.12em; color: var(--muted-2); text-transform: uppercase; margin-bottom: 16px; font-weight: 500; }
.footer-col ul { margin: 0; padding: 0; list-style: none; display: grid; gap: 10px; }
.footer-col a, .footer-col li { color: var(--muted); font-size: 13.5px; }
.footer-col a:hover { color: var(--cyan); }
.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding-top: 24px;
  flex-wrap: wrap;
  color: var(--muted-2);
  font-size: 12px;
}
.footer-bottom .mono { font-family: var(--mono); letter-spacing: 0.04em; }
.footer-bottom .icp { margin-left: 8px; color: var(--muted-2); white-space: nowrap; }
.footer-bottom .icp:hover { color: var(--cyan); }

/* ---------- Reveal ---------- */

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.65s ease, transform 0.65s ease;
}
.reveal.is-visible { opacity: 1; transform: none; }
.reveal.d1 { transition-delay: 0.08s; }
.reveal.d2 { transition-delay: 0.16s; }
.reveal.d3 { transition-delay: 0.24s; }

/* ---------- Animations ---------- */

@keyframes orbPulse {
  0%, 100% { opacity: 0.55; transform: scale(0.96); }
  50% { opacity: 1; transform: scale(1.06); }
}
@keyframes dashFlow { to { stroke-dashoffset: -28; } }
@keyframes floatY {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}
@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.45; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; }
  .reveal { opacity: 1; transform: none; }
}

/* ---------- Responsive ---------- */

@media (max-width: 1024px) {
  .hero .container { grid-template-columns: 1fr; gap: 36px; }
  .hero { padding-top: 140px; min-height: 0; }
  .hero-copy { max-width: 720px; }
  .hero-visual { max-width: 620px; margin-inline: auto; width: 100%; min-height: 0; }
  .hero-badge { left: 0; bottom: 2%; }
  .split, .about-band, .product-detail, .contact-grid { grid-template-columns: 1fr; gap: 38px; }
  .grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-top { grid-template-columns: 1.3fr 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
  .cta { padding: 46px; }
  .cta-inner { flex-direction: column; align-items: flex-start; }
  .case-card { grid-template-columns: 1fr; gap: 24px; }
}

@media (max-width: 760px) {
  .container { width: min(var(--max), calc(100% - 32px)); }
  .section { padding: 72px 0; }
  .section-tight { padding: 56px 0; }
  .nav { height: 68px; }
  .brand-mark { height: 38px; }
  .brand-cn { font-size: 18px; }
  .site-footer .brand-mark { height: 38px; }
  .nav-toggle { display: inline-flex; }
  .nav-links {
    position: fixed;
    inset: 68px 0 auto;
    display: grid;
    gap: 2px;
    padding: 14px 16px 22px;
    background: rgba(5, 12, 22, 0.97);
    border-bottom: 1px solid var(--line);
    backdrop-filter: blur(16px);
    transform: translateY(-12px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease, transform 0.2s ease;
  }
  .site-header.is-open .nav-links { opacity: 1; transform: none; pointer-events: auto; }
  .nav-links a { padding: 13px 14px; font-size: 15px; }
  .nav-actions .btn { display: none; }
  .hero { padding: 120px 0 64px; }
  .hero-actions { margin-bottom: 30px; }
  .hero-meta { gap: 8px 18px; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .stats { grid-template-columns: 1fr 1fr; }
  .stat { border-bottom: 1px solid var(--line); }
  .stat:nth-child(2n) { border-right: 0; }
  .stat:nth-last-child(-n + 2) { border-bottom: 0; }
  .about-points { grid-template-columns: 1fr; }
  .cta { padding: 30px 24px; border-radius: 18px; }
  .form { padding: 24px; }
  .form-row { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr 1fr; gap: 30px; }
  .footer-brand { grid-column: 1 / -1; }
  .page-hero { padding: 120px 0 52px; }
  .product-detail { padding: 48px 0; }
  .spec-list { grid-template-columns: 1fr; }
  .case-card { padding: 26px; }
  .diagram { padding: 18px; }
  .strip-inner { justify-content: flex-start; }
  .topology text { font-size: 11px; }
}

@media (max-width: 420px) {
  .brand-mark { height: 34px; }
  .brand-cn { font-size: 17px; }
  .site-footer .brand-mark { height: 34px; }
  .hero-actions .btn { flex: 1; }
  .stats { grid-template-columns: 1fr; }
  .stat { border-right: 0; }
  .stat:nth-last-child(2) { border-bottom: 1px solid var(--line); }
}