:root {
  --ink: #0c1a2e;
  --muted: #61708a;
  --line: #d9e4ef;
  --soft: #f4f8fb;
  --white: #ffffff;
  --blue: #1176ff;
  --cyan: #10c6d8;
  --green: #2eb872;
  --deep: #06182f;
  --gold: #f0b44a;
  font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--white);
  line-height: 1.6;
}
a { color: inherit; text-decoration: none; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 14px clamp(18px, 4vw, 56px);
  background: rgba(255, 255, 255, 0.92);
  border-bottom: 1px solid rgba(217, 228, 239, 0.8);
  backdrop-filter: blur(18px);
}
.brand { display: flex; align-items: center; gap: 10px; min-width: 180px; }
.brand-mark {
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  border-radius: 8px;
  color: #fff;
  background: linear-gradient(135deg, var(--blue), var(--cyan));
  font-weight: 800;
}
.brand strong, .brand small { display: block; }
.brand small { color: var(--muted); font-size: 12px; margin-top: -2px; }
.nav { display: flex; gap: 22px; align-items: center; font-size: 14px; color: #21334e; }
.nav a:hover { color: var(--blue); }
.nav-toggle { display: none; border: 0; background: var(--soft); border-radius: 8px; width: 40px; height: 40px; }

.section-band { padding: clamp(64px, 8vw, 108px) clamp(18px, 5vw, 72px); }
.section-band.light { background: var(--soft); }
.section-head { max-width: 820px; margin: 0 auto 34px; text-align: center; }
.eyebrow {
  display: inline-flex;
  align-items: center;
  color: var(--blue);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0;
  margin-bottom: 10px;
}
h1, h2, h3, p { margin-top: 0; }
h1 { font-size: clamp(38px, 6vw, 72px); line-height: 1.08; margin-bottom: 22px; letter-spacing: 0; }
h2 { font-size: clamp(28px, 4vw, 46px); line-height: 1.18; margin-bottom: 14px; letter-spacing: 0; }
h3 { font-size: 21px; line-height: 1.3; margin-bottom: 10px; letter-spacing: 0; }
p { color: var(--muted); }

.hero {
  min-height: 92vh;
  color: #fff;
  background:
    linear-gradient(110deg, rgba(6, 24, 47, 0.95), rgba(10, 47, 91, 0.84)),
    radial-gradient(circle at 85% 25%, rgba(16, 198, 216, 0.35), transparent 28%),
    linear-gradient(135deg, #071c38, #0a335c 52%, #063047);
  display: flex;
  align-items: center;
}
.hero-grid {
  width: min(1180px, 100%);
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(340px, 0.75fr);
  gap: clamp(36px, 6vw, 82px);
  align-items: center;
}
.hero p { color: rgba(255, 255, 255, 0.78); font-size: 18px; max-width: 760px; }
.hero .eyebrow { color: #7ee8f2; }
.hero-actions, .contact { display: flex; gap: 14px; align-items: center; flex-wrap: wrap; }
.btn {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  min-height: 46px;
  padding: 0 20px;
  border-radius: 8px;
  font-weight: 700;
  border: 1px solid transparent;
  cursor: pointer;
}
.btn.primary { background: var(--blue); color: #fff; box-shadow: 0 12px 26px rgba(17, 118, 255, 0.26); }
.btn.secondary { border-color: rgba(255, 255, 255, 0.34); color: #fff; }
.hero-metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin: 34px 0 0;
  max-width: 660px;
}
.hero-metrics div {
  padding: 16px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.07);
}
.hero-metrics dt { font-size: 28px; font-weight: 800; }
.hero-metrics dd { margin: 0; color: rgba(255, 255, 255, 0.7); font-size: 13px; }

.hero-visual {
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 8px;
  padding: 22px;
  background: rgba(255, 255, 255, 0.1);
  box-shadow: 0 28px 80px rgba(0, 0, 0, 0.26);
}
.visual-top { display: flex; justify-content: space-between; gap: 16px; margin-bottom: 18px; }
.visual-top strong { color: #8ff6cf; }
.radar { display: grid; gap: 14px; margin-bottom: 20px; }
.radar span {
  display: block;
  position: relative;
  padding: 12px 12px 12px calc(var(--p) - 12%);
  min-height: 46px;
  border-radius: 8px;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.09);
}
.radar span::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: var(--p);
  background: linear-gradient(90deg, rgba(16, 198, 216, 0.65), rgba(46, 184, 114, 0.55));
}
.radar span { isolation: isolate; }
.radar span::after {
  content: "";
  position: absolute;
  inset: 0;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 8px;
}
.query-card {
  padding: 18px;
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
}
.query-card small { color: var(--muted); }
.query-card p { color: var(--ink); font-weight: 700; margin: 6px 0 10px; }
.query-card strong { color: var(--blue); }

.diagnosis-layout {
  width: min(1100px, 100%);
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(300px, 0.9fr) 1fr;
  gap: 24px;
}
.diagnosis-form, .diagnosis-output, .tool-grid article, .operator-grid article, .flow article, .media-panel, .faq-list details, .case-panel {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}
.diagnosis-form { padding: 24px; display: grid; gap: 14px; }
label { color: #253853; font-weight: 700; font-size: 14px; }
input, select {
  width: 100%;
  min-height: 46px;
  margin-top: 6px;
  border: 1px solid #cdd9e6;
  border-radius: 8px;
  padding: 0 12px;
  font: inherit;
  color: var(--ink);
  background: #fff;
}
.form-note { font-size: 13px; margin: 0; }
.diagnosis-output { padding: 28px; }
.check-list { margin: 0; padding: 0; list-style: none; display: grid; gap: 12px; }
.check-list li { padding-left: 28px; position: relative; }
.check-list li::before { content: "✓"; position: absolute; left: 0; color: var(--green); font-weight: 800; }

.flow, .tool-grid, .operator-grid {
  width: min(1180px, 100%);
  margin: 0 auto;
  display: grid;
  gap: 16px;
}
.flow { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.flow article, .tool-grid article, .operator-grid article { padding: 22px; }
.flow span {
  display: inline-flex;
  color: var(--blue);
  font-weight: 800;
  margin-bottom: 14px;
}
.tool-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.tool-grid b { display: block; font-size: 18px; margin-bottom: 8px; }
.tool-grid p, .operator-grid p, .flow p { margin-bottom: 0; font-size: 15px; }

.split {
  width: min(1180px, 100%);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 0.8fr;
  gap: 36px;
  align-items: center;
}
.steps { display: grid; gap: 12px; margin-top: 28px; }
.steps div {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 14px;
  align-items: start;
  padding: 16px 0;
  border-top: 1px solid var(--line);
}
.steps span { color: var(--muted); }
.media-panel { padding: 24px; background: var(--deep); color: #fff; }
.media-panel ul { margin: 20px 0 0; padding-left: 20px; color: rgba(255, 255, 255, 0.76); }
.phone {
  width: min(280px, 90%);
  aspect-ratio: 9 / 16;
  margin: 0 auto;
  padding: 14px;
  border-radius: 24px;
  background: #081222;
  border: 1px solid rgba(255, 255, 255, 0.25);
}
.phone-video {
  height: 100%;
  border-radius: 18px;
  display: grid;
  place-content: center;
  text-align: center;
  background:
    linear-gradient(180deg, rgba(17, 118, 255, 0.15), rgba(16, 198, 216, 0.24)),
    linear-gradient(140deg, #11233f, #195a77);
}
.phone-video span { color: #9cecf4; }
.phone-video strong { font-size: 34px; }

.operator-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.tabs {
  display: flex;
  gap: 10px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 18px;
}
.tabs button {
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
  min-height: 42px;
  padding: 0 16px;
  border-radius: 8px;
  cursor: pointer;
}
.tabs button.active { background: var(--deep); color: #fff; border-color: var(--deep); }
.case-panel {
  display: none;
  width: min(900px, 100%);
  margin: 0 auto;
  padding: 28px;
}
.case-panel.active { display: block; }
.case-panel p { margin-bottom: 0; }

.timeline {
  width: min(1000px, 100%);
  margin: 0 auto;
  display: grid;
  gap: 12px;
}
.timeline div {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 18px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}
.timeline span { color: var(--muted); }
.faq-list { width: min(900px, 100%); margin: 0 auto; display: grid; gap: 12px; }
.faq-list details { padding: 18px 22px; }
.faq-list summary { font-weight: 800; cursor: pointer; }
.faq-list p { margin: 12px 0 0; }
.contact {
  width: min(1080px, 100%);
  margin: 0 auto;
  justify-content: space-between;
  padding: clamp(30px, 5vw, 56px);
  border-radius: 8px;
  background: var(--deep);
  color: #fff;
}
.contact p { color: rgba(255,255,255,0.72); max-width: 720px; margin-bottom: 0; }
.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  flex-wrap: wrap;
  padding: 26px clamp(18px, 5vw, 72px);
  background: #041122;
  color: rgba(255, 255, 255, 0.78);
  font-size: 14px;
}
.site-footer strong, .site-footer span, .site-footer a { display: block; }
.site-footer a { color: rgba(255, 255, 255, 0.78); }

@media (max-width: 920px) {
  .nav {
    position: absolute;
    top: 68px;
    left: 18px;
    right: 18px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding: 16px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 8px;
    box-shadow: 0 16px 36px rgba(6, 24, 47, 0.14);
  }
  .nav.open { display: flex; }
  .nav-toggle { display: inline-grid; place-items: center; }
  .hero { min-height: auto; padding-top: 76px; }
  .hero-grid, .diagnosis-layout, .split { grid-template-columns: 1fr; }
  .flow, .tool-grid, .operator-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 620px) {
  .section-band { padding-left: 16px; padding-right: 16px; }
  .hero-metrics, .flow, .tool-grid, .operator-grid { grid-template-columns: 1fr; }
  .hero-visual { padding: 16px; }
  .steps div, .timeline div { grid-template-columns: 1fr; gap: 4px; }
  .contact { align-items: stretch; }
  .contact .btn { width: 100%; }
  .site-footer { display: grid; }
}