:root {
  --bg: #f8fafc;
  --card: #ffffff;
  --text: #0b1220;
  --muted: rgba(11, 18, 32, 0.66);
  --line: rgba(148, 163, 184, 0.30);
  --brand: #00a3a3;
  --brand2: #38d6c4;
  --shadow: 0 18px 40px rgba(11, 18, 32, 0.10);
  --shadow2: 0 10px 26px rgba(11, 18, 32, 0.08);
  --radius: 18px;
  --radius2: 14px;
  --container: 1120px;
  --ease: cubic-bezier(0.2, 0.9, 0.2, 1);
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", Arial, sans-serif;
  color: var(--text);
  background: radial-gradient(1200px 600px at 15% 10%, rgba(0, 163, 163, 0.14), transparent 60%),
    radial-gradient(900px 520px at 85% 20%, rgba(56, 214, 196, 0.10), transparent 55%),
    linear-gradient(180deg, #ffffff, var(--bg) 40%, var(--bg));
}

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

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New",
    monospace;
  font-size: 0.95em;
  padding: 0.12em 0.38em;
  border-radius: 0.5em;
  background: rgba(0, 163, 163, 0.10);
}

.container {
  max-width: var(--container);
  padding: 0 18px;
  margin: 0 auto;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 10px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 10px 14px;
  z-index: 10000;
  box-shadow: var(--shadow2);
}
.skip-link:focus {
  left: 12px;
}

/* header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 2000;
  backdrop-filter: saturate(140%) blur(10px);
  background: rgba(255, 255, 255, 0.72);
  border-bottom: 1px solid rgba(148, 163, 184, 0.22);
  transition: box-shadow 220ms var(--ease), background 220ms var(--ease);
}
.site-header[data-elevated="true"] {
  box-shadow: 0 10px 26px rgba(11, 18, 32, 0.08);
  background: rgba(255, 255, 255, 0.86);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 14px;
  min-height: 70px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-width: 220px;
}
.brand-name {
  font-weight: 760;
  letter-spacing: 0.2px;
}
.brand-sub {
  display: block;
  margin-top: 2px;
  font-size: 12px;
  color: var(--muted);
}

.nav {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 16px;
}
.nav-link {
  font-size: 14px;
  color: rgba(11, 18, 32, 0.72);
  padding: 10px 10px;
  border-radius: 999px;
  transition: background 160ms var(--ease), color 160ms var(--ease);
}
.nav-link:hover {
  background: rgba(0, 163, 163, 0.10);
  color: rgba(11, 18, 32, 0.92);
}
.nav-cta {
  font-size: 14px;
  padding: 10px 14px;
  border-radius: 999px;
  color: #ffffff;
  background: linear-gradient(135deg, var(--brand), var(--brand2));
  box-shadow: 0 10px 20px rgba(0, 163, 163, 0.22);
}
.nav-cta:hover {
  filter: brightness(0.98);
}

.nav-toggle {
  margin-left: auto;
  width: 44px;
  height: 40px;
  border-radius: 12px;
  border: 1px solid rgba(148, 163, 184, 0.28);
  background: rgba(255, 255, 255, 0.72);
  display: none;
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding: 0;
}
.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  border-radius: 99px;
  background: rgba(11, 18, 32, 0.72);
}

.mobile-nav {
  display: none;
  border-top: 1px solid rgba(148, 163, 184, 0.22);
}
.mobile-nav-inner {
  padding: 10px 0 16px;
  display: grid;
  gap: 6px;
}
.mobile-nav .nav-link,
.mobile-nav .nav-cta {
  display: block;
  text-align: center;
}

/* hero */
.hero {
  padding: 54px 0 12px;
}
.hero-inner {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 28px;
  align-items: center;
}
.hero-copy {
  padding: 8px 0;
}
.pill {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 999px;
  border: 1px solid rgba(0, 163, 163, 0.22);
  background: rgba(255, 255, 255, 0.72);
  color: rgba(11, 18, 32, 0.78);
  font-size: 13px;
}
.pill .dot {
  width: 8px;
  height: 8px;
  border-radius: 99px;
  background: var(--brand);
  box-shadow: 0 0 0 5px rgba(0, 163, 163, 0.12);
}

.hero-title {
  margin: 16px 0 0;
  font-size: clamp(34px, 4.6vw, 54px);
  line-height: 1.08;
  letter-spacing: -0.4px;
}
.accent {
  background: linear-gradient(135deg, var(--brand), var(--brand2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-desc {
  margin: 14px 0 0;
  font-size: 16px;
  line-height: 1.7;
  color: var(--muted);
  max-width: 52ch;
}
.hero-actions {
  display: flex;
  gap: 12px;
  margin-top: 18px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 16px;
  border-radius: 14px;
  border: 1px solid rgba(148, 163, 184, 0.30);
  background: rgba(255, 255, 255, 0.78);
  font-weight: 640;
  font-size: 14px;
  transition: transform 160ms var(--ease), box-shadow 160ms var(--ease), background 160ms var(--ease);
  cursor: pointer;
}
.btn:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow2);
}
.btn:active {
  transform: translateY(0);
}
.btn-primary {
  border-color: rgba(0, 163, 163, 0.22);
  background: linear-gradient(135deg, var(--brand), var(--brand2));
  color: #fff;
  box-shadow: 0 14px 30px rgba(0, 163, 163, 0.18);
}
.btn-primary:hover {
  box-shadow: 0 18px 38px rgba(0, 163, 163, 0.22);
}
.btn-ghost {
  background: rgba(255, 255, 255, 0.60);
}

.hero-metrics {
  margin-top: 18px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}
.metric {
  border-radius: 16px;
  border: 1px solid rgba(148, 163, 184, 0.24);
  background: rgba(255, 255, 255, 0.70);
  padding: 12px 12px;
}
.metric-k {
  font-weight: 760;
  letter-spacing: 0.2px;
}
.metric-v {
  margin-top: 2px;
  font-size: 12px;
  color: var(--muted);
}

.hero-visual {
  border-radius: calc(var(--radius) + 10px);
  border: 1px solid rgba(148, 163, 184, 0.22);
  background: rgba(255, 255, 255, 0.62);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.hero-svg {
  width: 100%;
  height: auto;
  display: block;
}

.hero-below {
  margin-top: 18px;
}
.trust-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 10px;
  color: rgba(11, 18, 32, 0.62);
  font-size: 13px;
}
.trust-dot {
  width: 5px;
  height: 5px;
  border-radius: 99px;
  background: rgba(0, 163, 163, 0.6);
}

/* sections */
.section {
  padding: 58px 0;
}
.section-alt {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.0), rgba(255, 255, 255, 0.65));
  border-top: 1px solid rgba(148, 163, 184, 0.16);
  border-bottom: 1px solid rgba(148, 163, 184, 0.16);
}
.section-head {
  max-width: 70ch;
  margin: 0 auto 22px;
  text-align: center;
}
.section-title {
  margin: 0;
  font-size: clamp(22px, 2.6vw, 30px);
  letter-spacing: -0.2px;
}
.section-desc {
  margin: 10px 0 0;
  color: var(--muted);
  line-height: 1.75;
}

.grid {
  display: grid;
  gap: 14px;
}
.features-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}
.platforms-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}
.faq-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.card {
  background: rgba(255, 255, 255, 0.80);
  border: 1px solid rgba(148, 163, 184, 0.24);
  border-radius: var(--radius);
  box-shadow: 0 14px 30px rgba(11, 18, 32, 0.06);
}

.feature-card {
  padding: 18px 16px;
  transition: transform 200ms var(--ease), box-shadow 200ms var(--ease), border-color 200ms var(--ease);
}
.feature-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow2);
  border-color: rgba(0, 163, 163, 0.24);
}
.card-icon {
  width: 46px;
  height: 46px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  background: rgba(0, 163, 163, 0.10);
  border: 1px solid rgba(0, 163, 163, 0.18);
}
.card-title {
  margin: 12px 0 0;
  font-size: 16px;
  letter-spacing: 0.2px;
}
.card-desc {
  margin: 8px 0 0;
  color: var(--muted);
  line-height: 1.7;
  font-size: 14px;
}

.platform-card {
  padding: 16px 16px 18px;
}
.platform-badge {
  display: inline-flex;
  align-items: center;
  padding: 7px 10px;
  border-radius: 999px;
  background: rgba(0, 163, 163, 0.12);
  border: 1px solid rgba(0, 163, 163, 0.18);
  color: rgba(11, 18, 32, 0.82);
  font-weight: 700;
  font-size: 12px;
}
.platform-name {
  margin-top: 10px;
  font-weight: 760;
}
.platform-desc {
  margin-top: 8px;
  color: var(--muted);
  line-height: 1.7;
  font-size: 14px;
}

/* cta */
.cta {
  display: grid;
  grid-template-columns: 1.25fr 0.75fr;
  gap: 18px;
  padding: 22px;
  border-radius: calc(var(--radius) + 6px);
  border-color: rgba(0, 163, 163, 0.18);
  background: radial-gradient(1200px 400px at 20% 0%, rgba(0, 163, 163, 0.12), transparent 60%),
    radial-gradient(900px 420px at 90% 40%, rgba(56, 214, 196, 0.10), transparent 55%),
    rgba(255, 255, 255, 0.80);
}
.cta-title {
  margin: 0;
  font-size: clamp(20px, 2.3vw, 28px);
  letter-spacing: -0.2px;
}
.cta-desc {
  margin: 10px 0 0;
  color: var(--muted);
  line-height: 1.75;
}
.cta-actions {
  display: flex;
  gap: 12px;
  margin-top: 14px;
  flex-wrap: wrap;
}
.mini-note {
  margin-top: 10px;
  color: rgba(11, 18, 32, 0.62);
  font-size: 13px;
  line-height: 1.6;
}
.mini-note code {
  display: inline-block;
  margin-top: 6px;
  background: rgba(11, 18, 32, 0.06);
  border: 1px solid rgba(148, 163, 184, 0.25);
}

.qr-card {
  height: 100%;
  border-radius: 20px;
  border: 1px solid rgba(148, 163, 184, 0.22);
  background: rgba(255, 255, 255, 0.78);
  display: grid;
  align-content: start;
  justify-items: center;
  padding: 16px 14px;
  box-shadow: 0 10px 26px rgba(11, 18, 32, 0.06);
}
.qr-title {
  font-weight: 760;
}
.qr {
  margin-top: 12px;
}
.qr-foot {
  margin-top: 10px;
  font-size: 12px;
  color: var(--muted);
}

/* faq */
.faq-item {
  padding: 14px 16px;
}
.faq-item summary {
  cursor: pointer;
  font-weight: 740;
  list-style: none;
}
.faq-item summary::-webkit-details-marker {
  display: none;
}
.faq-item summary::after {
  content: "+";
  float: right;
  color: rgba(11, 18, 32, 0.55);
}
.faq-item[open] summary::after {
  content: "–";
}
.faq-item p {
  margin: 10px 0 0;
  color: var(--muted);
  line-height: 1.75;
}

/* footer */
.site-footer {
  padding: 26px 0 36px;
  border-top: 1px solid rgba(148, 163, 184, 0.18);
  background: rgba(255, 255, 255, 0.55);
}
.footer-inner {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
}
.footer-brand {
  display: flex;
  align-items: baseline;
  gap: 10px;
}
.footer-name {
  font-weight: 820;
}
.footer-meta {
  font-size: 12px;
  color: var(--muted);
}
.footer-note {
  margin-top: 8px;
  color: rgba(11, 18, 32, 0.62);
  font-size: 13px;
  line-height: 1.6;
}
.footer-right {
  display: flex;
  align-items: center;
  gap: 10px;
  color: rgba(11, 18, 32, 0.62);
  font-size: 13px;
}
.footer-link:hover {
  color: rgba(11, 18, 32, 0.86);
}
.footer-sep {
  opacity: 0.7;
}

/* responsive */
@media (max-width: 980px) {
  .hero-inner {
    grid-template-columns: 1fr;
  }
  .hero-visual {
    order: -1;
  }
  .features-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .platforms-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .cta {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  .nav {
    display: none;
  }
  .nav-toggle {
    display: inline-flex;
  }
  .mobile-nav[data-open="true"] {
    display: block;
  }
  .faq-grid {
    grid-template-columns: 1fr;
  }
  .hero {
    padding-top: 28px;
  }
  .hero-metrics {
    grid-template-columns: 1fr;
  }
  .features-grid {
    grid-template-columns: 1fr;
  }
  .platforms-grid {
    grid-template-columns: 1fr;
  }
  .footer-inner {
    flex-direction: column;
    align-items: stretch;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    scroll-behavior: auto !important;
    transition: none !important;
    animation: none !important;
  }
}