/* ---------- Base ---------- */
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
               "Hiragino Sans GB", "Microsoft YaHei", Roboto, Helvetica, Arial, sans-serif;
  color: #1a202c;
  background: #ffffff;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; }

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  background: rgba(255,255,255,0.92);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid #eef0f3;
  z-index: 50;
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; }
.logo {
  width: 32px; height: 32px;
  border-radius: 8px;
  background: linear-gradient(135deg, #ff9900 0%, #ffb84d 100%);
  color: #fff;
  display: grid; place-items: center;
  font-weight: 800; font-size: 14px;
}
.brand-name { font-size: 18px; }
.nav-links { display: flex; align-items: center; gap: 28px; font-size: 14.5px; color: #4a5568; }
.nav-links a:hover { color: #ff9900; }

@media (max-width: 720px) {
  .nav-links a:not(.btn) { display: none; }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-block;
  padding: 12px 22px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 15px;
  cursor: pointer;
  border: 1px solid transparent;
  transition: transform .15s ease, box-shadow .2s ease, background .2s ease;
}
.btn-primary {
  background: #ff9900;
  color: #fff;
  box-shadow: 0 6px 16px rgba(255,153,0,.25);
}
.btn-primary:hover { background: #e68a00; transform: translateY(-1px); }
.btn-ghost {
  background: transparent;
  color: #1a202c;
  border-color: #d8dde3;
}
.btn-ghost:hover { border-color: #1a202c; }
.btn-sm { padding: 8px 14px; font-size: 14px; }

/* ---------- Hero ---------- */
.hero {
  padding: 96px 0 80px;
  background:
    radial-gradient(1200px 600px at 80% -10%, rgba(255,153,0,.12), transparent 60%),
    radial-gradient(1000px 500px at 0% 0%, rgba(56,178,172,.08), transparent 60%);
  text-align: center;
}
.eyebrow {
  display: inline-block;
  padding: 6px 14px;
  border-radius: 999px;
  background: #fff5e6;
  color: #b36200;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 18px;
}
.hero h1 {
  font-size: 56px;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: 18px;
}
.lead {
  font-size: 19px;
  color: #4a5568;
  max-width: 720px;
  margin: 0 auto 32px;
}
.cta-row { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.hero-meta {
  margin-top: 32px;
  display: flex; gap: 28px; justify-content: center; flex-wrap: wrap;
  color: #718096; font-size: 14px;
}

@media (max-width: 640px) {
  .hero h1 { font-size: 40px; }
  .lead { font-size: 17px; }
}

/* ---------- Sections ---------- */
.section { padding: 88px 0; }
.section-alt { background: #f8fafc; }
.section-title {
  font-size: 36px;
  text-align: center;
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}
.section-sub {
  text-align: center;
  color: #4a5568;
  font-size: 17px;
  margin-bottom: 48px;
}

/* ---------- Feature grid ---------- */
.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}
@media (max-width: 900px) { .grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 600px) { .grid { grid-template-columns: 1fr; } }
.card {
  background: #fff;
  border: 1px solid #eef0f3;
  border-radius: 14px;
  padding: 28px;
  transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}
.card:hover { transform: translateY(-3px); box-shadow: 0 12px 30px rgba(15,23,42,.06); border-color: #ff9900; }
.icon {
  width: 44px; height: 44px;
  border-radius: 10px;
  background: #fff5e6;
  display: grid; place-items: center;
  font-size: 22px;
  margin-bottom: 16px;
}
.card h3 { font-size: 18px; margin-bottom: 8px; }
.card p { color: #4a5568; font-size: 15px; }

/* ---------- Steps ---------- */
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
  margin-top: 40px;
}
@media (max-width: 800px) { .steps { grid-template-columns: 1fr; } }
.step {
  background: #fff;
  border-radius: 14px;
  padding: 28px;
  border: 1px solid #eef0f3;
}
.step-num {
  width: 36px; height: 36px;
  border-radius: 50%;
  background: #ff9900;
  color: #fff;
  display: grid; place-items: center;
  font-weight: 700;
  margin-bottom: 14px;
}
.step h3 { font-size: 18px; margin-bottom: 6px; }
.step p { color: #4a5568; font-size: 15px; }

/* ---------- Use cases ---------- */
.usecases {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}
@media (max-width: 800px) { .usecases { grid-template-columns: 1fr; } }
.usecase {
  background: #fff;
  border: 1px solid #eef0f3;
  border-radius: 14px;
  padding: 26px;
}
.usecase h3 { font-size: 18px; margin-bottom: 8px; }
.usecase p { color: #4a5568; }

/* ---------- Pricing ---------- */
.pricing {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}
@media (max-width: 800px) { .pricing { grid-template-columns: 1fr; } }
.plan {
  background: #fff;
  border: 1px solid #eef0f3;
  border-radius: 14px;
  padding: 30px;
  position: relative;
}
.plan-featured {
  border-color: #ff9900;
  box-shadow: 0 18px 40px rgba(255,153,0,.12);
  transform: translateY(-4px);
}
.badge {
  position: absolute; top: -12px; left: 50%; transform: translateX(-50%);
  background: #ff9900; color: #fff;
  font-size: 12px; font-weight: 700;
  padding: 4px 10px; border-radius: 999px;
}
.plan h3 { font-size: 20px; margin-bottom: 8px; }
.price { font-size: 36px; font-weight: 800; margin-bottom: 14px; }
.price span { font-size: 14px; color: #718096; font-weight: 500; }
.plan ul { list-style: none; }
.plan ul li {
  padding: 8px 0;
  border-top: 1px dashed #eef0f3;
  color: #4a5568;
  font-size: 14.5px;
}
.plan ul li:first-child { border-top: none; }

/* ---------- FAQ ---------- */
.faq { max-width: 760px; margin: 0 auto; }
.faq details {
  background: #fff;
  border: 1px solid #eef0f3;
  border-radius: 12px;
  padding: 16px 20px;
  margin-bottom: 12px;
}
.faq summary {
  cursor: pointer;
  font-weight: 600;
  font-size: 16px;
  list-style: none;
}
.faq summary::after {
  content: "+";
  float: right;
  font-weight: 400;
  color: #718096;
  font-size: 20px;
}
.faq details[open] summary::after { content: "−"; }
.faq p { margin-top: 10px; color: #4a5568; font-size: 15px; }

/* ---------- Contact ---------- */
.contact {
  text-align: center;
  background: #fff;
  border: 1px solid #eef0f3;
  border-radius: 16px;
  padding: 56px 28px;
}
.contact h2 { font-size: 32px; margin-bottom: 10px; }
.contact > p { color: #4a5568; margin-bottom: 28px; }
.contact-info p { margin: 8px 0; color: #4a5568; }
.contact-info a { color: #ff9900; font-weight: 600; }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid #eef0f3;
  padding: 28px 0;
  background: #fff;
  font-size: 14px;
  color: #718096;
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}
.footer-links { display: flex; gap: 22px; }
.footer-links a:hover { color: #ff9900; }