:root {
  --bg: #070b14;
  --bg-2: #0a1120;
  --card: #0d1626;
  --card-2: #101c31;
  --line: rgba(148, 184, 255, 0.14);
  --line-strong: rgba(148, 184, 255, 0.3);
  --text: #e7eef9;
  --muted: #94a3b8;
  --accent: #38bdf8;
  --accent-2: #22d3ee;
  --accent-3: #818cf8;
  --grad: linear-gradient(90deg, #38bdf8, #22d3ee 50%, #818cf8);
  --radius: 16px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 76px;
}

body {
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 24px;
}

.grad {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(7, 11, 20, 0.72);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s, background 0.3s;
}

.nav.scrolled {
  border-bottom-color: var(--line);
  background: rgba(7, 11, 20, 0.9);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text);
  font-weight: 700;
  font-size: 18px;
  letter-spacing: 1px;
}

.brand svg {
  width: 26px;
  height: 26px;
  color: var(--accent);
}

.menu {
  display: flex;
  gap: 6px;
}

.menu a {
  color: var(--muted);
  text-decoration: none;
  font-size: 15px;
  padding: 8px 14px;
  border-radius: 8px;
  transition: color 0.25s, background 0.25s;
}

.menu a:hover {
  color: var(--text);
  background: rgba(56, 189, 248, 0.08);
}

.menu a.active {
  color: var(--accent);
}

.menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.menu-btn span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.3s, opacity 0.3s;
}

body.menu-open .menu-btn span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

body.menu-open .menu-btn span:nth-child(2) {
  opacity: 0;
}

body.menu-open .menu-btn span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  padding: 120px 0 60px;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(600px 320px at 15% 20%, rgba(56, 189, 248, 0.16), transparent 60%),
    radial-gradient(700px 360px at 85% 30%, rgba(129, 140, 248, 0.14), transparent 60%),
    radial-gradient(800px 400px at 50% 90%, rgba(34, 211, 238, 0.1), transparent 60%);
}

.hero-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(148, 184, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(148, 184, 255, 0.05) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, #000 20%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, #000 20%, transparent 75%);
}

.hero-inner {
  position: relative;
  text-align: center;
}

.hero-eyebrow {
  display: inline-block;
  padding: 6px 18px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  color: var(--accent);
  font-size: 14px;
  letter-spacing: 2px;
  background: rgba(56, 189, 248, 0.06);
}

.hero h1 {
  margin: 28px 0 20px;
  font-size: clamp(32px, 5.4vw, 58px);
  font-weight: 800;
  letter-spacing: 2px;
  line-height: 1.25;
}

.hero-sub {
  max-width: 720px;
  margin: 0 auto;
  color: var(--muted);
  font-size: 17px;
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin: 32px 0;
}

.hero-tags span {
  padding: 8px 18px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(13, 22, 38, 0.7);
  color: var(--text);
  font-size: 14px;
}

.hero-cta {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: 13px 34px;
  border-radius: 10px;
  text-decoration: none;
  font-size: 16px;
  font-weight: 600;
  transition: transform 0.25s, box-shadow 0.25s, background 0.25s;
}

.btn-primary {
  background: var(--grad);
  color: #04121f;
  box-shadow: 0 8px 28px rgba(56, 189, 248, 0.28);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 34px rgba(56, 189, 248, 0.4);
}

.btn-ghost {
  border: 1px solid var(--line-strong);
  color: var(--text);
}

.btn-ghost:hover {
  background: rgba(56, 189, 248, 0.08);
  transform: translateY(-2px);
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-top: 64px;
}

.hero-stats > div {
  padding: 22px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(13, 22, 38, 0.6);
  backdrop-filter: blur(6px);
}

.hero-stats strong {
  display: block;
  font-size: 24px;
  font-weight: 800;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-stats span {
  font-size: 13px;
  color: var(--muted);
}

.section {
  padding: 100px 0;
}

.section-alt {
  background: var(--bg-2);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.sec-head {
  text-align: center;
  margin-bottom: 56px;
}

.eyebrow {
  color: var(--accent);
  font-size: 13px;
  letter-spacing: 4px;
  font-weight: 600;
}

.sec-head h2 {
  font-size: clamp(28px, 3.6vw, 40px);
  font-weight: 800;
  letter-spacing: 2px;
  margin: 10px 0 12px;
}

.sec-head h2::after {
  content: "";
  display: block;
  width: 56px;
  height: 3px;
  margin: 16px auto 0;
  border-radius: 2px;
  background: var(--grad);
}

.sec-sub {
  color: var(--muted);
  font-size: 15px;
}

.about-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 40px;
  align-items: start;
}

.about-text p {
  color: var(--muted);
  margin-bottom: 16px;
  font-size: 15.5px;
}

.about-text p strong {
  color: var(--text);
}

.scope {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.scope span {
  padding: 6px 14px;
  font-size: 13px;
  border-radius: 999px;
  border: 1px solid var(--line);
  color: var(--muted);
  background: var(--card);
}

.about-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.info-card {
  padding: 26px 16px;
  text-align: center;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(160deg, var(--card-2), var(--card));
  transition: transform 0.3s, border-color 0.3s;
}

.info-card:hover {
  transform: translateY(-4px);
  border-color: var(--line-strong);
}

.info-card strong {
  display: block;
  font-size: 26px;
  font-weight: 800;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin-bottom: 6px;
}

.info-card span {
  font-size: 13px;
  color: var(--muted);
}

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

.partner-card {
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 26px 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(160deg, var(--card-2), var(--card));
  transition: transform 0.3s, border-color 0.3s, box-shadow 0.3s;
}

.partner-card:hover {
  transform: translateY(-4px);
  border-color: var(--line-strong);
  box-shadow: 0 16px 40px rgba(2, 8, 20, 0.6);
}

.partner-badge {
  flex: 0 0 auto;
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 14px;
  font-size: 22px;
  font-weight: 800;
  color: #04121f;
  background: var(--grad);
}

.partner-badge.p2 {
  background: linear-gradient(135deg, #34d399, #22d3ee);
}

.partner-badge.p3 {
  background: linear-gradient(135deg, #fbbf24, #f97316);
}

.partner-badge.p4 {
  background: linear-gradient(135deg, #60a5fa, #818cf8);
}

.partner-badge.p5 {
  background: linear-gradient(135deg, #f472b6, #c084fc);
}

.partner-badge.p6 {
  background: linear-gradient(135deg, #22d3ee, #34d399);
}

.partner-info h4 {
  font-size: 16px;
  letter-spacing: 0.5px;
}

.partner-info span {
  font-size: 13px;
  color: var(--muted);
}

.product-intro {
  display: grid;
  grid-template-columns: 1.6fr 1fr;
  gap: 32px;
  align-items: center;
  padding: 36px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(140deg, rgba(56, 189, 248, 0.08), rgba(13, 22, 38, 0.6) 55%);
  margin-bottom: 40px;
}

.product-intro-text h3 {
  font-size: 24px;
  letter-spacing: 1px;
  margin-bottom: 14px;
}

.product-intro-text p {
  color: var(--muted);
  font-size: 15px;
  margin-bottom: 18px;
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.chips span {
  padding: 6px 14px;
  border-radius: 8px;
  font-size: 13px;
  color: var(--accent-2);
  border: 1px solid rgba(34, 211, 238, 0.3);
  background: rgba(34, 211, 238, 0.07);
}

.product-intro-visual {
  display: flex;
  align-items: center;
  justify-content: center;
}

.product-intro-visual svg {
  width: 150px;
  height: 150px;
  color: var(--accent);
  filter: drop-shadow(0 0 24px rgba(56, 189, 248, 0.45));
}

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

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

.card {
  padding: 30px 26px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(160deg, var(--card-2), var(--card));
  transition: transform 0.3s, border-color 0.3s, box-shadow 0.3s;
}

.card:hover {
  transform: translateY(-5px);
  border-color: var(--line-strong);
  box-shadow: 0 16px 40px rgba(2, 8, 20, 0.6);
}

.icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  margin-bottom: 18px;
  color: var(--accent);
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.25);
}

.icon svg {
  width: 24px;
  height: 24px;
}

.card h4 {
  font-size: 17px;
  letter-spacing: 0.5px;
  margin-bottom: 10px;
}

.card p {
  color: var(--muted);
  font-size: 14px;
}

.service-card {
  padding: 36px 32px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(160deg, var(--card-2), var(--card));
  transition: transform 0.3s, border-color 0.3s;
}

.service-card:hover {
  transform: translateY(-4px);
  border-color: var(--line-strong);
}

.service-head {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 16px;
}

.service-head .icon {
  margin-bottom: 0;
}

.service-head h3 {
  font-size: 22px;
  letter-spacing: 1px;
}

.service-desc {
  color: var(--muted);
  font-size: 14.5px;
  margin-bottom: 20px;
}

.service-card ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.service-card li {
  position: relative;
  padding-left: 20px;
  color: var(--muted);
  font-size: 14px;
}

.service-card li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: var(--grad);
  transform: rotate(45deg);
}

.service-card li strong {
  color: var(--text);
  margin-right: 6px;
}

.flywheel {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 34px;
  margin-bottom: 44px;
}

.step {
  position: relative;
  padding: 26px 18px;
  text-align: center;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(170deg, var(--card-2), var(--card));
  transition: transform 0.3s, border-color 0.3s;
}

.step:hover {
  transform: translateY(-5px);
  border-color: var(--line-strong);
}

.step:not(:last-child)::after {
  content: "";
  position: absolute;
  top: 50%;
  right: -23px;
  width: 10px;
  height: 10px;
  border-top: 2px solid var(--accent);
  border-right: 2px solid var(--accent);
  transform: rotate(45deg);
  opacity: 0.7;
}

.step-tag {
  display: inline-block;
  padding: 3px 14px;
  border-radius: 999px;
  font-size: 12px;
  letter-spacing: 2px;
  color: #04121f;
  background: var(--grad);
  font-weight: 700;
  margin-bottom: 12px;
}

.step h4 {
  font-size: 17px;
  margin-bottom: 10px;
  letter-spacing: 1px;
}

.step p {
  color: var(--muted);
  font-size: 13px;
}

.kpi {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-bottom: 32px;
}

.kpi > div {
  text-align: center;
  padding: 24px 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(13, 22, 38, 0.6);
}

.kpi strong {
  display: block;
  font-size: 28px;
  font-weight: 800;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.kpi span {
  font-size: 13px;
  color: var(--muted);
}

.ai-note {
  max-width: 860px;
  margin: 0 auto;
  text-align: center;
  color: var(--muted);
  font-size: 14.5px;
  padding: 22px 28px;
  border: 1px dashed var(--line-strong);
  border-radius: var(--radius);
  background: rgba(56, 189, 248, 0.04);
}

.contact-grid .contact-card {
  text-align: center;
  padding: 36px 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(160deg, var(--card-2), var(--card));
  transition: transform 0.3s, border-color 0.3s;
}

.contact-card:hover {
  transform: translateY(-4px);
  border-color: var(--line-strong);
}

.contact-card .icon {
  margin: 0 auto 16px;
}

.contact-card h4 {
  font-size: 16px;
  margin-bottom: 8px;
  letter-spacing: 1px;
}

.contact-card p {
  color: var(--muted);
  font-size: 15px;
}

.footer {
  border-top: 1px solid var(--line);
  padding: 18px 0;
  background: var(--bg-2);
}

.footer-inner {
  text-align: center;
}

.footer p {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.6;
}

.footer a {
  color: var(--muted);
  text-decoration: none;
  transition: color 0.2s ease;
  white-space: nowrap;   /* 备案号须完整显示，不允许被折行拆开 */
}

.footer a:hover {
  color: var(--accent);
  text-decoration: underline;
}

.footer .sep {
  margin: 0 8px;
  opacity: 0.45;
}

/* 公安备案：图标在左、编号在右（图标 36x40 原图，按 18x20 显示） */
.footer .beian-gongan {
  white-space: nowrap;
}

.footer .beian-gongan[hidden] {
  display: none;
}

.footer .beian-gongan img {
  width: 18px;
  height: 20px;
  margin-right: 4px;
  vertical-align: -4px;   /* 与行内文字基线对齐 */
}

.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 960px) {
  .menu {
    position: fixed;
    top: 68px;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: rgba(7, 11, 20, 0.97);
    border-bottom: 1px solid var(--line);
    padding: 12px 24px 20px;
    transform: translateY(-12px);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.3s, opacity 0.3s;
  }

  body.menu-open .menu {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .menu a {
    padding: 12px 8px;
    border-bottom: 1px solid var(--line);
    border-radius: 0;
  }

  .menu a:last-child {
    border-bottom: none;
  }

  .menu-btn {
    display: flex;
  }

  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
  }

  .about-grid,
  .product-intro {
    grid-template-columns: 1fr;
  }

  .product-intro-visual {
    display: none;
  }

  .grid-3,
  .grid-2 {
    grid-template-columns: 1fr;
  }

  .partners-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .flywheel {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .step:not(:last-child)::after {
    top: auto;
    bottom: -16px;
    right: auto;
    left: 50%;
    transform: rotate(135deg);
  }

  .kpi {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 560px) {
  .hero-stats,
  .kpi,
  .about-cards {
    grid-template-columns: 1fr 1fr;
  }

  .partners-grid {
    grid-template-columns: 1fr;
  }

  .section {
    padding: 72px 0;
  }
}