:root {
  color-scheme: light;
  --ink: #17343b;
  --muted: #58777b;
  --soft: #effbf8;
  --paper: #f8fffd;
  --panel: #ffffff;
  --line: #cceee7;
  --brand: #10bdaa;
  --brand-dark: #078b80;
  --hot: #ff8a32;
  --navy: #092833;
  --shadow: 0 22px 60px rgba(18, 92, 84, 0.12);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 12% 0%, rgba(16, 189, 170, 0.13), transparent 30rem),
    linear-gradient(180deg, #f4fffc 0%, #ffffff 42%, #f7fffd 100%);
  line-height: 1.72;
}

a { color: var(--brand-dark); }
a:hover { color: var(--hot); }

.shell {
  width: min(1120px, calc(100% - 36px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(248, 255, 253, 0.88);
  border-bottom: 1px solid rgba(204, 238, 231, 0.9);
  backdrop-filter: blur(18px);
}

.site-header .shell {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--ink);
  text-decoration: none;
  font-weight: 900;
  letter-spacing: -0.02em;
}

.brand img {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  box-shadow: 0 8px 18px rgba(16, 189, 170, 0.2);
}

.brand small {
  display: block;
  color: var(--muted);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.nav {
  display: flex;
  align-items: center;
  gap: 18px;
  font-size: 14px;
  font-weight: 750;
}

.nav a { color: var(--muted); text-decoration: none; }
.nav a[aria-current="page"], .nav a:hover { color: var(--brand-dark); }

.hero {
  position: relative;
  overflow: hidden;
  padding: 92px 0 72px;
}

.hero::after {
  content: "";
  position: absolute;
  width: 440px;
  height: 440px;
  right: -180px;
  top: -160px;
  border: 70px solid rgba(255, 138, 50, 0.08);
  border-radius: 50%;
}

.hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(320px, 0.8fr);
  gap: 64px;
  align-items: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255,255,255,0.84);
  color: var(--brand-dark);
  font-size: 13px;
  font-weight: 850;
}

.eyebrow::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--hot);
  box-shadow: 0 0 0 5px rgba(255, 138, 50, 0.12);
}

h1, h2, h3 { line-height: 1.2; letter-spacing: -0.035em; }

h1 {
  max-width: 760px;
  margin: 22px 0 18px;
  font-size: clamp(44px, 7vw, 78px);
}

.gradient-text {
  background: linear-gradient(110deg, var(--brand-dark), var(--brand), var(--hot));
  -webkit-background-clip: text;
  color: transparent;
}

.lead {
  max-width: 720px;
  margin: 0;
  color: var(--muted);
  font-size: clamp(17px, 2.2vw, 21px);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 20px;
  border: 1px solid var(--line);
  border-radius: 15px;
  background: var(--panel);
  color: var(--ink);
  text-decoration: none;
  font-weight: 850;
  box-shadow: 0 10px 24px rgba(10, 86, 78, 0.08);
}

.button.primary {
  border-color: var(--brand);
  color: white;
  background: linear-gradient(135deg, var(--brand), var(--brand-dark));
}

.device-card {
  position: relative;
  min-height: 390px;
  padding: 28px;
  border: 1px solid rgba(255,255,255,0.14);
  border-radius: 34px;
  color: white;
  background:
    radial-gradient(circle at 80% 10%, rgba(255, 138, 50, 0.45), transparent 180px),
    linear-gradient(145deg, #123e47, #071e29 72%);
  box-shadow: 0 36px 80px rgba(7, 30, 41, 0.28);
}

.device-card::after {
  content: "";
  position: absolute;
  inset: 20% 16% 12%;
  border: 1px solid rgba(102, 245, 225, 0.35);
  border-radius: 50%;
  box-shadow: 0 0 0 38px rgba(16, 189, 170, 0.08), 0 0 0 78px rgba(16, 189, 170, 0.04);
}

.device-card > * { position: relative; z-index: 1; }

.device-label {
  color: #9deee3;
  font-size: 12px;
  font-weight: 850;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.device-card strong {
  display: block;
  margin-top: 6px;
  font-size: 27px;
}

.live-stats {
  position: absolute;
  left: 28px;
  right: 28px;
  bottom: 28px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.live-stats div {
  padding: 13px;
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 16px;
  background: rgba(255,255,255,0.08);
  backdrop-filter: blur(8px);
}

.live-stats span { display: block; color: #a9c6cb; font-size: 11px; }
.live-stats b { font-size: 20px; }

.section { padding: 72px 0; }
.section.soft { background: rgba(232, 255, 248, 0.55); border-block: 1px solid var(--line); }

.section-heading { max-width: 720px; margin-bottom: 32px; }
.section-heading h2 { margin: 0 0 12px; font-size: clamp(32px, 5vw, 48px); }
.section-heading p { margin: 0; color: var(--muted); font-size: 17px; }

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.card {
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: rgba(255,255,255,0.92);
  box-shadow: var(--shadow);
}

.card h3 { margin: 12px 0 8px; font-size: 21px; }
.card p { margin: 0; color: var(--muted); }

.icon-box {
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border-radius: 15px;
  background: var(--soft);
  color: var(--brand-dark);
  font-size: 23px;
}

.steps { counter-reset: steps; }
.steps .card { position: relative; padding-top: 70px; }
.steps .card::before {
  counter-increment: steps;
  content: "0" counter(steps);
  position: absolute;
  top: 22px;
  left: 24px;
  color: var(--brand);
  font-size: 26px;
  font-weight: 950;
}

.notice {
  padding: 22px 24px;
  border: 1px solid #ffd5b6;
  border-radius: 20px;
  background: #fff7f0;
  color: #6a3b1b;
}

.notice strong { color: #a34b0d; }

.cta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  padding: 36px;
  border-radius: 28px;
  color: white;
  background: linear-gradient(135deg, var(--navy), #0b4f56);
  box-shadow: 0 28px 70px rgba(7, 30, 41, 0.2);
}

.cta h2 { margin: 0 0 8px; font-size: 31px; }
.cta p { margin: 0; color: #b8d7da; }

.article {
  width: min(900px, calc(100% - 36px));
  margin: 0 auto;
  padding: 64px 0 88px;
}

.article-header {
  padding: 34px;
  border: 1px solid var(--line);
  border-radius: 28px;
  background: linear-gradient(135deg, #ffffff, var(--soft));
  box-shadow: var(--shadow);
}

.article-header h1 { margin: 14px 0 12px; font-size: clamp(36px, 7vw, 58px); }
.article-header p { margin: 0; color: var(--muted); }

.article section { padding-top: 34px; scroll-margin-top: 88px; }
.article h2 { margin: 0 0 14px; font-size: 27px; }
.article h3 { margin: 24px 0 8px; font-size: 19px; }
.article p, .article li { color: #36585d; }
.article li + li { margin-top: 7px; }

.meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
}

.toc {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 20px;
}

.toc a {
  padding: 6px 11px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: white;
  text-decoration: none;
  font-size: 13px;
  font-weight: 750;
}

.support-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.support-grid .card { box-shadow: none; }

.contact-box {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
  align-items: center;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: var(--soft);
}

.site-footer {
  border-top: 1px solid var(--line);
  padding: 34px 0 46px;
  color: var(--muted);
  font-size: 14px;
}

.footer-grid {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  align-items: flex-start;
}

.footer-links { display: flex; flex-wrap: wrap; gap: 12px 18px; }
.footer-links a { color: var(--muted); }

@media (max-width: 820px) {
  .nav { display: none; }
  .hero { padding-top: 64px; }
  .hero-grid { grid-template-columns: 1fr; gap: 38px; }
  .device-card { min-height: 330px; }
  .grid-3, .support-grid { grid-template-columns: 1fr; }
  .cta, .footer-grid { align-items: flex-start; flex-direction: column; }
}

@media (max-width: 480px) {
  .shell, .article { width: min(100% - 24px, 1120px); }
  .site-header .shell { min-height: 64px; }
  .brand img { width: 38px; height: 38px; }
  .brand small { display: none; }
  .hero { padding: 48px 0 56px; }
  h1 { font-size: 42px; }
  .device-card { min-height: 300px; padding: 22px; }
  .live-stats { left: 18px; right: 18px; bottom: 18px; }
  .live-stats div { padding: 10px; }
  .live-stats b { font-size: 17px; }
  .section { padding: 54px 0; }
  .card, .article-header { border-radius: 20px; }
  .article-header { padding: 25px; }
  .cta { padding: 26px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}