:root {
  --ink: #0b2b1d;
  --ink-2: #123c29;
  --brand: #15803d;
  --brand-bright: #22c55e;
  --bg: #f6faf7;
  --card: #ffffff;
  --muted: #5b6b63;
  --line: #e4ece7;
  --shadow: 0 1px 2px rgba(6, 24, 16, 0.05), 0 10px 30px rgba(6, 24, 16, 0.07);
  --radius: 18px;
  --font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

.container { max-width: 1160px; margin: 0 auto; padding: 0 24px; }
section { padding: 88px 0; }

/* ---------- Nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--line);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 68px; }
.logo { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 19px; letter-spacing: 0.5px; }
.logo-mark {
  width: 34px; height: 34px; border-radius: 9px;
  background: linear-gradient(135deg, #14532d, #22c55e);
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 4px 12px rgba(34, 197, 94, 0.35);
}
.nav-links { display: flex; gap: 34px; font-size: 15px; color: var(--muted); font-weight: 500; }
.nav-links a { transition: color 0.2s; }
.nav-links a:hover { color: var(--ink); }
.nav-cta {
  background: var(--ink); color: #fff; font-size: 14px; font-weight: 600;
  padding: 9px 20px; border-radius: 999px; transition: background 0.2s;
}
.nav-cta:hover { background: var(--brand); }

/* ---------- Hero ---------- */
.hero { padding: 96px 0 72px; }
.hero-grid { display: grid; grid-template-columns: 1.05fr 1fr; gap: 56px; align-items: center; }
.hero-tag {
  display: inline-flex; align-items: center; gap: 8px;
  background: #eaf7ef; color: var(--brand);
  font-size: 13.5px; font-weight: 600; padding: 6px 14px; border-radius: 999px;
  margin-bottom: 22px;
}
.hero-tag .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--brand-bright); }
.hero h1 { font-size: 50px; line-height: 1.22; font-weight: 800; letter-spacing: 0.5px; }
.hero h1 em { font-style: normal; color: var(--brand); }
.hero p.lead { margin-top: 22px; font-size: 17.5px; color: var(--muted); max-width: 480px; }
.hero-actions { display: flex; gap: 14px; margin-top: 34px; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 13px 28px; border-radius: 999px; font-size: 15.5px; font-weight: 600;
  transition: transform 0.15s, box-shadow 0.2s, background 0.2s;
}
.btn:active { transform: scale(0.98); }
.btn-primary {
  background: linear-gradient(135deg, #166534, #22c55e); color: #fff;
  box-shadow: 0 8px 22px rgba(34, 197, 94, 0.35);
}
.btn-primary:hover { box-shadow: 0 10px 26px rgba(34, 197, 94, 0.45); }
.btn-ghost { background: #fff; color: var(--ink); border: 1px solid var(--line); }
.btn-ghost:hover { border-color: var(--brand); color: var(--brand); }
.hero-visual {
  border-radius: 24px; overflow: hidden; box-shadow: var(--shadow);
  border: 1px solid var(--line); background: #fff;
}

/* ---------- Stats ---------- */
.stats { background: var(--ink); color: #fff; padding: 52px 0; }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; text-align: center; }
.stats .num { font-size: 34px; font-weight: 800; color: #4ade80; }
.stats .label { margin-top: 6px; font-size: 14.5px; color: rgba(255, 255, 255, 0.72); }

/* ---------- Section head ---------- */
.sec-head { max-width: 640px; margin-bottom: 52px; }
.sec-head .kicker {
  color: var(--brand); font-weight: 700; font-size: 14px;
  letter-spacing: 2px; text-transform: uppercase; margin-bottom: 12px;
}
.sec-head h2 { font-size: 36px; font-weight: 800; line-height: 1.3; }
.sec-head p { margin-top: 14px; color: var(--muted); font-size: 16.5px; }
.sec-center { text-align: center; margin-left: auto; margin-right: auto; }

/* ---------- App section ---------- */
.app-grid { display: grid; grid-template-columns: 1fr 1.1fr; gap: 64px; align-items: center; }
.phone-row { display: flex; gap: 22px; justify-content: center; }
.phone {
  width: 262px; border-radius: 34px; border: 9px solid #10231a;
  overflow: hidden; box-shadow: 0 24px 48px rgba(6, 24, 16, 0.18);
  background: #fff;
}
.phone.small { width: 232px; margin-top: 44px; }
.feature-list { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin-top: 30px; }
.feature {
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 20px 20px 18px;
  box-shadow: 0 1px 2px rgba(6, 24, 16, 0.04);
  transition: transform 0.2s, box-shadow 0.2s;
}
.feature:hover { transform: translateY(-3px); box-shadow: var(--shadow); }
.feature .ico {
  width: 40px; height: 40px; border-radius: 12px; background: #eaf7ef;
  display: flex; align-items: center; justify-content: center; margin-bottom: 12px;
}
.feature h3 { font-size: 16px; font-weight: 700; }
.feature p { font-size: 13.5px; color: var(--muted); margin-top: 5px; line-height: 1.65; }

/* ---------- Platform ---------- */
.platform { background: #fff; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.platform-grid { display: grid; grid-template-columns: 1.15fr 1fr; gap: 56px; align-items: center; }
.platform-visual { border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); border: 1px solid var(--line); }
.plain-list { display: grid; gap: 14px; margin-top: 28px; }
.plain-item {
  display: flex; gap: 14px; align-items: flex-start;
  background: var(--bg); border: 1px solid var(--line);
  border-radius: 14px; padding: 16px 18px;
}
.plain-item .ico {
  flex: none; width: 38px; height: 38px; border-radius: 11px;
  background: #eaf7ef; display: flex; align-items: center; justify-content: center;
}
.plain-item h3 { font-size: 15.5px; font-weight: 700; }
.plain-item p { font-size: 13.5px; color: var(--muted); margin-top: 2px; line-height: 1.6; }

/* ---------- Products ---------- */
.prod-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 26px; }
.prod-card {
  background: var(--card); border: 1px solid var(--line);
  border-radius: 20px; padding: 30px; box-shadow: 0 1px 2px rgba(6, 24, 16, 0.04);
  transition: transform 0.2s, box-shadow 0.2s;
}
.prod-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.prod-card .badge {
  display: inline-block; font-size: 12.5px; font-weight: 700; color: var(--brand);
  background: #eaf7ef; padding: 4px 12px; border-radius: 999px; margin-bottom: 14px;
}
.prod-card h3 { font-size: 20px; font-weight: 800; }
.prod-card p.desc { margin-top: 10px; font-size: 14.5px; color: var(--muted); }
.specs { margin-top: 18px; border-top: 1px dashed var(--line); padding-top: 16px; display: grid; gap: 9px; }
.specs li { display: flex; justify-content: space-between; font-size: 13.5px; }
.specs .k { color: var(--muted); }
.specs .v { font-weight: 600; }

/* ---------- Scenarios ---------- */
.scenes { background: var(--ink); color: #fff; }
.scenes .sec-head h2 { color: #fff; }
.scenes .sec-head p { color: rgba(255, 255, 255, 0.65); }
.scene-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 14px; }
.scene {
  background: rgba(255, 255, 255, 0.06); border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 14px; padding: 22px 12px; text-align: center;
  font-size: 14px; font-weight: 600; transition: background 0.2s;
}
.scene:hover { background: rgba(255, 255, 255, 0.12); }
.scene .ico { font-size: 24px; margin-bottom: 10px; }

/* ---------- About ---------- */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }
.about-visual { border-radius: 20px; overflow: hidden; box-shadow: var(--shadow); }
.about-copy p { color: var(--muted); font-size: 15.5px; margin-top: 16px; }
.value-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 24px; }
.value-tags span {
  background: #eaf7ef; color: var(--brand); font-size: 13.5px; font-weight: 600;
  padding: 7px 16px; border-radius: 999px;
}

/* ---------- Contact band ---------- */
.contact-band {
  background: linear-gradient(135deg, #14532d, #1a7a42); border-radius: 24px;
  color: #fff; padding: 52px 56px; display: flex; align-items: center; justify-content: space-between; gap: 32px;
}
.contact-band h2 { font-size: 28px; font-weight: 800; }
.contact-band p { margin-top: 10px; color: rgba(255, 255, 255, 0.8); font-size: 15px; }
.contact-band .info { text-align: right; font-size: 15px; line-height: 2; color: rgba(255, 255, 255, 0.92); }
.contact-band .info b { font-size: 17px; }

/* ---------- Footer ---------- */
footer { background: #071f15; color: rgba(255, 255, 255, 0.6); padding: 56px 0 34px; font-size: 13.5px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 40px; padding-bottom: 34px; border-bottom: 1px solid rgba(255, 255, 255, 0.1); }
.footer-grid h4 { color: #fff; font-size: 15px; margin-bottom: 14px; font-weight: 700; }
.footer-grid li { margin-bottom: 9px; }
.footer-grid a:hover { color: #4ade80; }
.footer-bottom { padding-top: 24px; display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }

/* ---------- Sub pages (privacy / support / terms) ---------- */
.page-hero { background: #fff; border-bottom: 1px solid var(--line); padding: 64px 0 44px; }
.page-hero h1 { font-size: 34px; font-weight: 800; }
.page-hero .meta { margin-top: 10px; color: var(--muted); font-size: 14px; }
.doc { max-width: 860px; margin: 0 auto; padding: 56px 24px 88px; }
.doc h2 {
  font-size: 21px; font-weight: 800; margin: 40px 0 14px;
  padding-left: 14px; border-left: 4px solid var(--brand-bright);
}
.doc h2:first-child { margin-top: 0; }
.doc h3 { font-size: 16.5px; font-weight: 700; margin: 22px 0 8px; }
.doc p, .doc li { font-size: 15px; color: #37453e; }
.doc p { margin-bottom: 12px; }
.doc ul { padding-left: 22px; list-style: disc; margin-bottom: 12px; }
.doc li { margin-bottom: 6px; }
.doc .tip {
  background: #eaf7ef; border: 1px solid #cdeeda; border-radius: 14px;
  padding: 18px 20px; font-size: 14.5px; color: #14532d; margin: 18px 0;
}
.doc table { width: 100%; border-collapse: collapse; margin: 16px 0; font-size: 14px; }
.doc th, .doc td { border: 1px solid var(--line); padding: 10px 14px; text-align: left; }
.doc th { background: #f0f7f2; font-weight: 700; }

/* ---------- Support ---------- */
.support-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; margin-bottom: 56px; }
.support-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 28px; text-align: center; box-shadow: 0 1px 2px rgba(6, 24, 16, 0.04);
}
.support-card .ico {
  width: 48px; height: 48px; border-radius: 14px; background: #eaf7ef;
  display: flex; align-items: center; justify-content: center; margin: 0 auto 14px;
}
.support-card h3 { font-size: 16.5px; font-weight: 800; }
.support-card p { font-size: 14px; color: var(--muted); margin-top: 6px; }
.support-card .big { font-size: 18px; font-weight: 800; color: var(--ink); margin-top: 10px; }
.faq { max-width: 820px; margin: 0 auto; }
.faq details {
  background: #fff; border: 1px solid var(--line); border-radius: 14px;
  padding: 18px 22px; margin-bottom: 12px; cursor: pointer;
}
.faq summary { font-weight: 700; font-size: 15.5px; list-style: none; position: relative; padding-right: 28px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+"; position: absolute; right: 2px; top: 50%; transform: translateY(-50%);
  font-size: 20px; color: var(--brand); font-weight: 400;
}
.faq details[open] summary::after { content: "−"; }
.faq details p { margin-top: 10px; font-size: 14.5px; color: var(--muted); }

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  .hero h1 { font-size: 36px; }
  .hero-grid, .app-grid, .platform-grid, .about-grid { grid-template-columns: 1fr; gap: 40px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 30px; }
  .prod-grid { grid-template-columns: 1fr; }
  .scene-grid { grid-template-columns: repeat(3, 1fr); }
  .feature-list { grid-template-columns: 1fr 1fr; }
  .support-grid { grid-template-columns: 1fr; }
  .nav-links { display: none; }
  .contact-band { flex-direction: column; text-align: center; padding: 40px 28px; }
  .contact-band .info { text-align: center; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  section { padding: 64px 0; }
  .hero { padding: 64px 0 48px; }
}