:root {
  --ink: #10212e;
  --muted: #516572;
  --line: #d7e2e8;
  --paper: #f4f8fa;
  --white: #ffffff;
  --navy: #153b56;
  --blue: #0f6f8f;
  --blue-dark: #0b526d;
  --teal: #0b8f7c;
  --teal-soft: #e7f7f3;
  --amber: #b7791f;
  --danger: #b23a48;
  --shadow: 0 18px 46px rgba(16, 33, 46, .12);
  --radius: 18px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--white);
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans SC", sans-serif;
  line-height: 1.65;
}
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }

.skip-link {
  position: fixed;
  left: 12px;
  top: -60px;
  z-index: 100;
  padding: 10px 16px;
  color: #fff;
  background: var(--navy);
  border-radius: 8px;
}
.skip-link:focus { top: 12px; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  border-bottom: 1px solid rgba(215, 226, 232, .85);
  background: rgba(255,255,255,.96);
  backdrop-filter: blur(14px);
}
.header-inner {
  width: min(1180px, calc(100% - 40px));
  min-height: 72px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.brand { display: flex; align-items: center; gap: 12px; font-weight: 800; }
.brand img { width: 36px; height: 36px; border-radius: 9px; }
.brand small { display: block; color: var(--muted); font-size: 11px; font-weight: 500; }
.nav { display: flex; align-items: center; gap: 6px; }
.nav a {
  padding: 9px 11px;
  color: var(--muted);
  border-radius: 8px;
  font-size: 14px;
}
.nav a:hover, .nav a[aria-current="page"] { color: var(--blue-dark); background: #edf6f9; }
.menu-toggle {
  display: none;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
  border-radius: 9px;
  padding: 8px 12px;
}

.container { width: min(1180px, calc(100% - 40px)); margin: 0 auto; }
.section { padding: 88px 0; }
.section.soft { background: var(--paper); }
.section.dark { color: #fff; background: linear-gradient(135deg, #102c41, #174a5e); }
.section-head { max-width: 760px; margin-bottom: 34px; }
.section-head.center { text-align: center; margin-left: auto; margin-right: auto; }
.kicker {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin-bottom: 12px;
  color: var(--teal);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: .08em;
}
.kicker::before { content: ""; width: 28px; height: 2px; background: currentColor; }
h1, h2, h3 { margin: 0; line-height: 1.25; }
h1 { font-size: clamp(38px, 5vw, 66px); letter-spacing: -.035em; }
h2 { font-size: clamp(28px, 3.3vw, 43px); letter-spacing: -.02em; }
h3 { font-size: 20px; }
p { margin: 0; }
.section-head p, .lead { margin-top: 16px; color: var(--muted); font-size: 17px; }
.dark .section-head p, .dark .lead { color: rgba(255,255,255,.74); }

.hero {
  position: relative;
  overflow: hidden;
  min-height: 690px;
  display: grid;
  align-items: center;
  padding: 84px 0 94px;
  background:
    radial-gradient(circle at 82% 18%, rgba(11,143,124,.18), transparent 28rem),
    linear-gradient(145deg, #f8fbfc 0%, #edf6f8 55%, #fff 100%);
}
.hero-grid { display: grid; grid-template-columns: .96fr 1.04fr; gap: 56px; align-items: center; }
.hero-copy .lead { max-width: 670px; font-size: 18px; }
.boundary {
  display: flex;
  gap: 10px;
  margin-top: 22px;
  padding: 13px 15px;
  border-left: 3px solid var(--teal);
  color: var(--muted);
  background: rgba(255,255,255,.72);
  font-size: 14px;
}
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.btn {
  min-height: 46px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 11px 19px;
  border: 1px solid var(--line);
  border-radius: 10px;
  color: var(--ink);
  background: #fff;
  cursor: pointer;
  font-weight: 700;
  transition: transform .18s ease, box-shadow .18s ease, background .18s ease;
}
.btn:hover { transform: translateY(-1px); box-shadow: 0 8px 22px rgba(16,33,46,.12); }
.btn.primary { color: #fff; border-color: var(--blue); background: linear-gradient(135deg, var(--blue), var(--teal)); }
.btn.secondary { color: var(--blue-dark); border-color: #b9d8e2; background: #f7fcfd; }
.btn:disabled { opacity: .62; cursor: wait; transform: none; }
.hero-visual { position: relative; }
.hero-visual img { width: 100%; aspect-ratio: 16 / 11; object-fit: cover; border-radius: 24px; box-shadow: var(--shadow); }
.hero-visual::after {
  content: "状态监测 · 异常预警 · 诊断分析";
  position: absolute;
  left: 22px;
  bottom: 22px;
  padding: 11px 15px;
  border: 1px solid rgba(255,255,255,.28);
  border-radius: 10px;
  color: #fff;
  background: rgba(11,32,46,.78);
  backdrop-filter: blur(8px);
  font-size: 14px;
  font-weight: 700;
}

.grid { display: grid; gap: 20px; }
.grid.two { grid-template-columns: repeat(2, minmax(0,1fr)); }
.grid.three { grid-template-columns: repeat(3, minmax(0,1fr)); }
.grid.six { grid-template-columns: repeat(3, minmax(0,1fr)); }
.card {
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  box-shadow: 0 8px 24px rgba(16,33,46,.05);
}
.card h3 { margin-bottom: 11px; }
.card p, .card li { color: var(--muted); }
.card ul { margin: 12px 0 0; padding-left: 20px; }
.number {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  margin-bottom: 20px;
  border-radius: 10px;
  color: var(--blue-dark);
  background: #eaf5f8;
  font-weight: 900;
}
.feature-card { position: relative; overflow: hidden; }
.feature-card::after { content: ""; position: absolute; right: -22px; bottom: -32px; width: 90px; height: 90px; border-radius: 50%; background: rgba(11,143,124,.08); }

.problem-list { display: grid; grid-template-columns: repeat(4, minmax(0,1fr)); gap: 1px; overflow: hidden; border: 1px solid var(--line); border-radius: var(--radius); background: var(--line); }
.problem { padding: 25px 22px; background: #fff; }
.problem strong { display: block; margin-bottom: 8px; color: var(--navy); }
.problem span { color: var(--muted); font-size: 14px; }

.screens { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 20px; }
.screen-card { overflow: hidden; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; box-shadow: var(--shadow); }
.screen-card:first-child { grid-column: 1 / -1; }
.screen-card img { display: block; width: 100%; height: 360px; object-fit: contain; object-position: center; background: #1d292e; }
.screen-card:first-child img { height: auto; }
.screen-caption { padding: 17px 20px; border-top: 1px solid var(--line); }
.screen-caption strong { display: block; }
.screen-caption span { color: var(--muted); font-size: 13px; }

.brand-row { display: flex; flex-wrap: wrap; gap: 12px; }
.brand-chip { padding: 10px 16px; border: 1px solid var(--line); border-radius: 999px; color: var(--navy); background: #fff; font-weight: 700; }
.note { margin-top: 18px; color: var(--muted); font-size: 14px; }

.steps { display: grid; grid-template-columns: repeat(5, minmax(0,1fr)); gap: 12px; counter-reset: step; }
.step { position: relative; padding: 25px 20px; border: 1px solid var(--line); border-radius: 14px; background: #fff; }
.step::before { counter-increment: step; content: "0" counter(step); display: block; margin-bottom: 14px; color: var(--teal); font-weight: 900; }
.step p { margin-top: 9px; color: var(--muted); font-size: 14px; }

.faq { max-width: 920px; }
.faq details { border-bottom: 1px solid var(--line); padding: 19px 0; }
.faq summary { cursor: pointer; font-weight: 800; }
.faq p { padding: 13px 0 0; color: var(--muted); }

.page-hero { padding: 92px 0 68px; color: #fff; background: linear-gradient(135deg, #102c41, #17546a); }
.page-hero .lead { max-width: 760px; color: rgba(255,255,255,.76); }
.content-block { max-width: 860px; }
.content-block h2 { margin: 42px 0 16px; font-size: 30px; }
.content-block h3 { margin: 26px 0 10px; }
.content-block p, .content-block li { color: var(--muted); }
.content-block li + li { margin-top: 8px; }
.content-block a { color: var(--blue); text-decoration: underline; }

.form-tabs { display: flex; flex-wrap: wrap; gap: 9px; margin-bottom: 24px; }
.form-tab { padding: 10px 15px; border: 1px solid var(--line); border-radius: 9px; background: #fff; color: var(--muted); cursor: pointer; }
.form-tab[aria-selected="true"] { color: #fff; border-color: var(--blue); background: var(--blue); }
.lead-form { display: none; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 17px; }
.lead-form.is-active { display: grid; }
.field { display: grid; gap: 7px; }
.field.wide, .consent, .form-actions { grid-column: 1 / -1; }
.field span { font-size: 14px; font-weight: 700; }
.field input, .field select, .field textarea {
  width: 100%;
  padding: 11px 12px;
  color: var(--ink);
  border: 1px solid #bfd0d8;
  border-radius: 9px;
  background: #fff;
}
.field textarea { min-height: 118px; resize: vertical; }
.field input:focus, .field select:focus, .field textarea:focus { outline: 3px solid rgba(15,111,143,.15); border-color: var(--blue); }
.consent { display: flex; align-items: flex-start; gap: 9px; color: var(--muted); font-size: 13px; }
.consent input { margin-top: 4px; }
.consent a { color: var(--blue); text-decoration: underline; }
.form-notice { min-height: 26px; margin-top: 13px; font-size: 14px; }
.form-notice.success { color: var(--teal); }
.form-notice.error { color: var(--danger); }
.contact-layout { display: grid; grid-template-columns: .72fr 1.28fr; gap: 40px; align-items: start; }
.contact-panel { padding: 28px; border-radius: var(--radius); color: #fff; background: var(--navy); }
.contact-panel a { display: block; margin-top: 14px; color: #fff; }
.contact-panel p { margin-top: 12px; color: rgba(255,255,255,.72); }
.form-panel { padding: 30px; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; box-shadow: var(--shadow); }

.cta-band { padding: 48px 0; color: #fff; background: linear-gradient(120deg, var(--blue-dark), var(--teal)); }
.cta-inner { display: flex; align-items: center; justify-content: space-between; gap: 30px; }
.cta-inner p { margin-top: 8px; color: rgba(255,255,255,.76); }
.cta-inner .btn { flex: 0 0 auto; }

.site-footer { padding: 36px 0; color: #d9e7ed; background: #0d2638; }
.footer-grid { display: grid; grid-template-columns: 1.2fr 1fr 1fr; gap: 30px; }
.site-footer strong { color: #fff; }
.site-footer p, .site-footer a, .site-footer span { color: #b9cad2; font-size: 13px; }
.site-footer a:hover { color: #fff; }
.footer-bottom { margin-top: 26px; padding-top: 20px; border-top: 1px solid rgba(255,255,255,.12); display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; }

@media (max-width: 960px) {
  .hero-grid, .contact-layout { grid-template-columns: 1fr; }
  .hero { min-height: 0; }
  .hero-visual { max-width: 760px; }
  .grid.three, .grid.six { grid-template-columns: repeat(2,minmax(0,1fr)); }
  .problem-list { grid-template-columns: repeat(2,minmax(0,1fr)); }
  .steps { grid-template-columns: repeat(3,minmax(0,1fr)); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .menu-toggle { display: block; }
  .nav { display: none; position: absolute; left: 20px; right: 20px; top: 66px; padding: 12px; flex-direction: column; align-items: stretch; border: 1px solid var(--line); border-radius: 12px; background: #fff; box-shadow: var(--shadow); }
  .nav.is-open { display: flex; }
}

@media (max-width: 640px) {
  .container, .header-inner { width: min(100% - 28px, 1180px); }
  .section { padding: 64px 0; }
  .hero { padding: 60px 0 68px; }
  .hero-grid { gap: 34px; }
  h1 { font-size: 38px; }
  .brand small { display: none; }
  .grid.two, .grid.three, .grid.six, .problem-list, .steps, .screens, .footer-grid { grid-template-columns: 1fr; }
  .screen-card:first-child { grid-column: auto; }
  .screen-card img, .screen-card:first-child img { height: auto; }
  .lead-form { grid-template-columns: 1fr; }
  .field.wide, .consent, .form-actions { grid-column: auto; }
  .cta-inner { align-items: flex-start; flex-direction: column; }
  .actions .btn { width: 100%; }
  .form-panel { padding: 22px 18px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; }
}