* { box-sizing: border-box; }

:root {
  --dark: #1B2430;
  --dark-2: #232D3B;
  --dark-footer: #1C2026;
  --blue: #3D8BF2;
  --blue-hover: #2F7AE5;
  --blue-light: #EAF3FE;
  --accent: #C75B4A;
  --accent-hover: #B54E3E;
  --text-title: #1D2129;
  --text-body: #646A73;
  --text-muted: #86909C;
  --text-on-dark: #FFFFFF;
  --text-dim: rgba(255, 255, 255, 0.72);
  --bg-page: #F5F6F8;
  --bg-white: #FFFFFF;
  --border: #E8E8E8;
}

html, body {
  margin: 0;
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
  color: var(--text-body);
  background: var(--bg-page);
  line-height: 1.6;
}

a { text-decoration: none; color: inherit; }

.wrap {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 20px;
}

.top {
  position: sticky;
  top: 0;
  z-index: 30;
}

.top-dark {
  background: rgba(27, 36, 48, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.bar {
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 17px;
  color: var(--text-on-dark);
}

.brand img {
  width: 32px;
  height: 32px;
  border-radius: 6px;
  object-fit: cover;
}

.mark {
  width: 32px;
  height: 32px;
  border-radius: 6px;
  background: var(--blue);
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
}

nav {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.nav-link {
  color: var(--text-dim);
  font-size: 14px;
}

.nav-link:hover { color: #fff; }

.contact {
  color: rgba(255, 255, 255, 0.5);
  font-size: 13px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--blue);
  color: #fff !important;
  border-radius: 4px;
  padding: 9px 22px;
  font-weight: 600;
  font-size: 14px;
  border: 1px solid transparent;
  transition: background 0.2s;
}

.btn:hover { background: var(--blue-hover); }

.btn.lg {
  padding: 12px 28px;
  font-size: 15px;
}

.btn.outline {
  background: transparent;
  border-color: rgba(255, 255, 255, 0.35);
  color: #fff !important;
}

.btn.outline:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.5);
}

.hero-dark {
  position: relative;
  background: var(--dark);
  color: var(--text-on-dark);
  padding: 48px 0 0;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 70% 60% at 80% 40%, rgba(61, 139, 242, 0.12), transparent 60%),
    radial-gradient(ellipse 50% 50% at 20% 80%, rgba(199, 91, 74, 0.08), transparent 55%);
  pointer-events: none;
}

.hero-globe {
  position: absolute;
  right: -6%;
  top: 48%;
  transform: translateY(-50%);
  width: min(52vw, 460px);
  height: min(52vw, 460px);
  color: #fff;
  opacity: 0.14;
  pointer-events: none;
  z-index: 0;
}

.hero-globe svg { width: 100%; height: 100%; }

.hero-inner {
  position: relative;
  z-index: 1;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 40px;
  align-items: center;
  padding-bottom: 48px;
}

.hero-copy h1 {
  margin: 0 0 18px;
  font-size: 40px;
  line-height: 1.3;
  font-weight: 700;
  color: #fff;
}

.hero-copy p {
  margin: 0 0 32px;
  font-size: 16px;
  color: var(--text-dim);
  line-height: 1.85;
  max-width: 520px;
}

.cta {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

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

.orbit {
  position: relative;
  width: 320px;
  height: 200px;
}

.orbit::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 280px;
  height: 120px;
  transform: translate(-50%, -50%);
  border: 3px solid rgba(255, 255, 255, 0.12);
  border-radius: 50%;
}

.orbit-left,
.orbit-right {
  position: absolute;
  width: 130px;
  height: 130px;
  border-radius: 50%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.25);
}

.orbit-left {
  left: 10px;
  top: 35px;
  background: linear-gradient(145deg, #4A9AF5, #2F7AE5);
}

.orbit-right {
  right: 10px;
  top: 35px;
  background: linear-gradient(145deg, #D4634B, #C75B4A);
}

.orbit-left span,
.orbit-right span {
  font-size: 22px;
  font-weight: 700;
  color: #fff;
}

.orbit-left small,
.orbit-right small {
  font-size: 11px;
  color: rgba(255, 255, 255, 0.85);
  margin-top: 4px;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  padding-bottom: 48px;
}

.stat-card {
  padding: 24px 28px;
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.stat-card.accent {
  background: var(--accent);
  border-color: var(--accent);
}

.stat-card strong {
  display: block;
  font-size: 28px;
  font-weight: 700;
  color: #fff;
  line-height: 1.2;
}

.stat-card span {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.85);
}

.stat-card:not(.accent) span {
  color: var(--text-dim);
}

.section-head {
  text-align: center;
  max-width: 600px;
  margin: 0 auto 40px;
}

.section-head h2 {
  margin: 0 0 12px;
  font-size: 30px;
  font-weight: 700;
  color: var(--text-title);
}

.section-head p {
  margin: 0;
  color: var(--text-body);
  font-size: 16px;
}

.block {
  padding: 64px 0;
  background: var(--bg-white);
}

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

.feat-grid article {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 24px;
  transition: box-shadow 0.2s, border-color 0.2s;
}

.feat-grid article:hover {
  border-color: #BFD9FA;
  box-shadow: 0 8px 24px rgba(61, 139, 242, 0.1);
}

.feat-grid .icon {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  color: var(--blue);
  background: var(--blue-light);
  border-radius: 2px;
  padding: 4px 10px;
  margin-bottom: 14px;
}

.feat-grid h3 {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 600;
  color: var(--text-title);
}

.feat-grid p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
}

.privacy-block {
  padding: 64px 0;
  background: var(--bg-page);
}

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

.privacy-grid article {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
  border-radius: 6px;
  padding: 24px;
}

.privacy-grid h3 {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 600;
  color: var(--text-title);
}

.privacy-grid p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
}

.workflow {
  padding: 64px 0;
  background: var(--bg-white);
}

.steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.steps li {
  background: var(--bg-page);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 24px;
}

.steps span {
  display: inline-flex;
  width: 32px;
  height: 32px;
  align-items: center;
  justify-content: center;
  border-radius: 4px;
  background: var(--blue);
  color: #fff;
  font-size: 14px;
  font-weight: 700;
  margin-bottom: 14px;
}

.steps h3 {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 600;
  color: var(--text-title);
}

.steps p {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
}

.cta-band {
  padding: 56px 0;
  background: linear-gradient(135deg, #1B2430 0%, #2A3544 100%);
  color: #fff;
}

.cta-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}

.cta-band h2 {
  margin: 0 0 10px;
  font-size: 26px;
  font-weight: 700;
}

.cta-band p {
  margin: 0;
  color: var(--text-dim);
  font-size: 15px;
}

footer {
  padding: 40px 0 36px;
  background: var(--dark-footer);
  color: rgba(255, 255, 255, 0.45);
  font-size: 13px;
  text-align: center;
}

.foot-brand {
  font-size: 16px;
  font-weight: 700;
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: 12px;
}

.beian {
  margin-top: 12px;
  display: flex;
  gap: 20px;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  line-height: 1;
}

.beian a {
  color: rgba(255, 255, 255, 0.45);
  display: inline-flex;
  align-items: center;
  white-space: nowrap;
  font-size: 13px;
}

.beian a:hover { color: rgba(255, 255, 255, 0.7); }

.gongan-link img {
  width: 14px;
  height: 14px;
  display: block;
  margin-right: 4px;
  flex-shrink: 0;
}

@media (max-width: 960px) {
  .hero-grid { grid-template-columns: 1fr; }
  .orbit { transform: scale(0.9); }
  .feat-grid { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .cta-inner { flex-direction: column; text-align: center; }
}

@media (max-width: 640px) {
  nav .nav-link { display: none; }
  .hero-copy h1 { font-size: 28px; }
  .hero-stats,
  .feat-grid,
  .privacy-grid,
  .steps { grid-template-columns: 1fr; }
  .hero-visual { display: none; }
  .hero-globe { width: 260px; height: 260px; right: -18%; opacity: 0.1; }
}