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

:root {
  --bg: #f6f8fc;
  --surface: #ffffff;
  --surface-soft: #eef4ff;
  --ink: #0f172a;
  --muted: #64748b;
  --line: #dbe5f2;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --cyan: #06b6d4;
  --violet: #7c3aed;
  --green: #10b981;
  --orange: #f59e0b;
  --radius: 28px;
  --shadow: 0 24px 70px rgba(15, 23, 42, .12);
}

html {
  scroll-behavior: smooth;
}

body {
  color: var(--ink);
  background:
    radial-gradient(circle at 10% 0%, rgba(37, 99, 235, .12), transparent 30%),
    radial-gradient(circle at 90% 8%, rgba(124, 58, 237, .1), transparent 30%),
    var(--bg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  line-height: 1.7;
}

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

img {
  display: block;
  max-width: 100%;
}

.container {
  width: min(1180px, 92%);
  margin: 0 auto;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid rgba(219, 229, 242, .86);
  background: rgba(255, 255, 255, .82);
  backdrop-filter: blur(20px);
}

.nav {
  min-height: 76px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 22px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 950;
  font-size: 22px;
  letter-spacing: -.03em;
}

.brand-mark {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border-radius: 16px;
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--violet));
  box-shadow: 0 16px 34px rgba(37, 99, 235, .25);
}

.nav-links {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px;
  color: #334155;
  font-size: 14px;
  font-weight: 800;
}

.nav-links a {
  padding: 9px 12px;
  border-radius: 999px;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--primary-dark);
  background: #eaf2ff;
}

.language {
  padding: 9px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: #334155;
  background: #fff;
  font-weight: 900;
  font-size: 13px;
}

.hero {
  padding: 86px 0 64px;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(360px, 520px);
  align-items: center;
  gap: 50px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 18px;
  padding: 8px 14px;
  border: 1px solid #c7d9ff;
  border-radius: 999px;
  color: var(--primary-dark);
  background: rgba(255, 255, 255, .72);
  font-size: 13px;
  font-weight: 950;
}

h1,
h2,
h3 {
  line-height: 1.15;
  letter-spacing: -.045em;
}

h1 {
  max-width: 760px;
  font-size: clamp(42px, 7vw, 74px);
}

h2 {
  font-size: clamp(30px, 4vw, 48px);
}

h3 {
  font-size: 22px;
}

.lead {
  margin-top: 22px;
  max-width: 720px;
  color: var(--muted);
  font-size: 18px;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 32px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 48px;
  padding: 13px 24px;
  border: 1px solid transparent;
  border-radius: 999px;
  cursor: pointer;
  font-weight: 950;
  transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-primary {
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--violet));
  box-shadow: 0 18px 40px rgba(37, 99, 235, .24);
}

.btn-light {
  color: var(--primary-dark);
  border-color: #c7d9ff;
  background: #fff;
}

.btn-ghost {
  color: #fff;
  border-color: rgba(255, 255, 255, .34);
  background: rgba(255, 255, 255, .12);
}

.btn-soft {
  color: #0f172a;
  border-color: var(--line);
  background: #f8fbff;
}

.trust {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-top: 34px;
}

.trust-item,
.card,
.platform-card,
.feature-card,
.protocol-item,
.step-card,
.faq-item,
.download-card {
  border: 1px solid rgba(219, 229, 242, .9);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, .82);
  box-shadow: 0 12px 36px rgba(15, 23, 42, .06);
}

.trust-item {
  padding: 16px;
}

.trust-item strong {
  display: block;
  font-size: 20px;
}

.trust-item span {
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
}

.hero-art {
  position: relative;
}

.hero-art img {
  width: 100%;
  border-radius: 34px;
  box-shadow: var(--shadow);
}

.floating-card {
  position: absolute;
  right: -8px;
  bottom: 24px;
  width: min(280px, 62%);
  padding: 18px;
  border: 1px solid rgba(255, 255, 255, .7);
  border-radius: 24px;
  background: rgba(255, 255, 255, .78);
  box-shadow: 0 22px 50px rgba(15, 23, 42, .13);
  backdrop-filter: blur(18px);
}

.mini-line {
  height: 8px;
  margin-top: 14px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--green), var(--cyan), var(--primary));
}

.section {
  padding: 78px 0;
}

.section-head {
  max-width: 820px;
  margin: 0 auto 40px;
  text-align: center;
}

.section-head p {
  margin-top: 14px;
  color: var(--muted);
}

.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));
}

.platform-card,
.feature-card,
.protocol-item,
.step-card,
.download-card,
.faq-item,
.card {
  padding: 24px;
}

.platform-card {
  display: grid;
  gap: 14px;
}

.platform-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.tag {
  display: inline-flex;
  width: fit-content;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  border-radius: 999px;
  color: #1d4ed8;
  background: #eaf2ff;
  font-size: 12px;
  font-weight: 950;
}

.status {
  color: #047857;
  background: #dcfce7;
}

.muted {
  color: var(--muted);
}

.feature-card {
  min-height: 230px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.icon {
  width: 54px;
  height: 54px;
  display: grid;
  place-items: center;
  margin-bottom: 18px;
  border-radius: 18px;
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--cyan));
  font-weight: 950;
  font-size: 20px;
}

.work {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(340px, 500px);
  gap: 28px;
  align-items: stretch;
}

.code-card {
  overflow: hidden;
  border-radius: var(--radius);
  background: #0f172a;
  box-shadow: var(--shadow);
}

.code-head {
  display: flex;
  gap: 8px;
  padding: 16px 18px;
  border-bottom: 1px solid rgba(255, 255, 255, .08);
}

.dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: #fb7185;
}

.dot:nth-child(2) {
  background: #fbbf24;
}

.dot:nth-child(3) {
  background: #34d399;
}

pre {
  overflow-x: auto;
  padding: 22px;
  color: #dbeafe;
  font-size: 14px;
  line-height: 1.75;
}

.check-list {
  display: grid;
  gap: 12px;
  margin-top: 24px;
}

.check-list li {
  list-style: none;
  padding-left: 28px;
  position: relative;
  color: #334155;
}

.check-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  top: 0;
  color: var(--green);
  font-weight: 950;
}

.protocol-item {
  min-height: 130px;
}

.protocol-item strong {
  display: block;
  margin-bottom: 8px;
}

.recommend img,
.download-card img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  margin-bottom: 18px;
  border-radius: 22px;
}

.step-number {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  margin-bottom: 18px;
  border-radius: 14px;
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--violet));
  font-weight: 950;
}

.scenario {
  min-height: 180px;
}

.faq-item h3 {
  margin-bottom: 10px;
  font-size: 20px;
}

.cta {
  overflow: hidden;
  color: #fff;
  border-radius: 42px;
  background:
    radial-gradient(circle at 10% 10%, rgba(6, 182, 212, .38), transparent 36%),
    linear-gradient(135deg, #0f172a, #1d4ed8 58%, #7c3aed);
  box-shadow: var(--shadow);
}

.cta-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 24px;
  padding: 44px;
}

.cta p {
  margin-top: 12px;
  color: #dbeafe;
}

footer {
  padding: 56px 0 34px;
  color: #475569;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr repeat(4, 1fr);
  gap: 24px;
}

.footer-col h3 {
  margin-bottom: 14px;
  color: var(--ink);
  font-size: 16px;
}

.footer-col a,
.footer-col span {
  display: block;
  margin-bottom: 8px;
  color: #64748b;
  font-size: 14px;
}

.copyright {
  margin-top: 34px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  color: #64748b;
  font-size: 13px;
}

.page-hero {
  padding: 72px 0 36px;
}

.page-hero .lead {
  max-width: 860px;
}

.notice {
  padding: 16px 18px;
  border: 1px solid #fde68a;
  border-radius: 22px;
  color: #854d0e;
  background: #fffbeb;
}

@media (max-width: 980px) {
  .hero-grid,
  .work,
  .cta-inner {
    grid-template-columns: 1fr;
  }

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

  .nav {
    align-items: flex-start;
    flex-direction: column;
    padding: 16px 0;
  }
}

@media (max-width: 640px) {
  .grid-2,
  .grid-3,
  .grid-4,
  .trust,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-top: 54px;
  }

  .section {
    padding: 54px 0;
  }

  .cta-inner {
    padding: 28px;
  }

  .floating-card {
    position: static;
    width: 100%;
    margin-top: 16px;
  }
}