:root {
  --bg: #f4f6fb;
  --surface: #ffffff;
  --text: #151a2d;
  --muted: #5b647a;
  --line: #e6eaf3;
  --brand: #5b6cff;
  --brand-2: #8b5cf6;
  --brand-dark: #3f4ed6;
  --ok: #0f9f6e;
  --shadow: 0 18px 50px rgba(35, 48, 96, 0.10);
  --radius: 18px;
  --max: 1080px;
  --font: "Segoe UI", system-ui, -apple-system, "PingFang SC", "Noto Sans SC",
    "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--text);
  background:
    radial-gradient(1000px 480px at 10% -10%, rgba(91, 108, 255, 0.16), transparent 60%),
    radial-gradient(800px 420px at 100% 0%, rgba(139, 92, 246, 0.12), transparent 55%),
    var(--bg);
  line-height: 1.65;
}
a { color: var(--brand-dark); text-decoration: none; }
a:hover { text-decoration: underline; }
.container { width: min(var(--max), calc(100% - 2rem)); margin: 0 auto; }
.narrow { width: min(760px, calc(100% - 2rem)); }

.nav {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(12px);
  background: rgba(244, 246, 251, 0.82);
  border-bottom: 1px solid rgba(230, 234, 243, 0.8);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
  gap: 1rem;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
}
.brand-mark {
  width: 30px;
  height: 30px;
  border-radius: 9px;
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  box-shadow: 0 8px 18px rgba(91, 108, 255, 0.35);
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  justify-content: flex-end;
}
.nav-links a {
  color: var(--muted);
  font-size: 0.95rem;
  text-decoration: none;
}
.nav-links a:hover { color: var(--text); }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  padding: 0.8rem 1.25rem;
  font-weight: 600;
  border: 1px solid transparent;
  text-decoration: none !important;
  transition: 0.15s ease;
  cursor: pointer;
}
.btn-sm { padding: 0.45rem 0.9rem; font-size: 0.9rem; }
.btn-primary {
  color: #fff !important;
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  box-shadow: 0 10px 24px rgba(91, 108, 255, 0.28);
}
.btn-primary:hover { filter: brightness(1.05); transform: translateY(-1px); }
.btn-ghost {
  color: var(--text) !important;
  background: rgba(255, 255, 255, 0.7);
  border-color: var(--line);
}
.btn-ghost:hover { background: #fff; }

.hero { padding: 4.5rem 0 3rem; }
.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 2.5rem;
  align-items: center;
}
.eyebrow {
  display: inline-block;
  margin: 0 0 0.8rem;
  padding: 0.25rem 0.7rem;
  border-radius: 999px;
  background: rgba(91, 108, 255, 0.1);
  color: var(--brand-dark);
  font-size: 0.85rem;
  font-weight: 600;
}
.hero h1 {
  margin: 0 0 1rem;
  font-size: clamp(2rem, 4vw, 2.8rem);
  line-height: 1.2;
  letter-spacing: -0.02em;
}
.lead {
  margin: 0 0 1.5rem;
  color: var(--muted);
  font-size: 1.05rem;
  max-width: 36rem;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-bottom: 1.4rem; }
.trust-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  padding: 0;
  margin: 0;
  list-style: none;
  color: var(--muted);
  font-size: 0.92rem;
}
.trust-row li::before {
  content: "✓";
  color: var(--ok);
  font-weight: 700;
  margin-right: 0.35rem;
}

.hero-card { display: flex; justify-content: center; }
.mock-window {
  width: min(100%, 360px);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 20px;
  box-shadow: var(--shadow);
  overflow: hidden;
}
.mock-dots {
  display: flex;
  gap: 6px;
  padding: 12px 14px;
  background: #f0f3fb;
  border-bottom: 1px solid var(--line);
}
.mock-dots span {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: #d5dbeb;
}
.mock-dots span:nth-child(1) { background: #ff7b72; }
.mock-dots span:nth-child(2) { background: #ffd33d; }
.mock-dots span:nth-child(3) { background: #3fb950; }
.mock-body { padding: 1.2rem 1.2rem 1.4rem; }
.mock-line {
  height: 10px;
  border-radius: 999px;
  background: linear-gradient(90deg, #edf0f8, #f7f8fc);
  margin-bottom: 0.7rem;
}
.mock-line.w80 { width: 80%; }
.mock-line.w60 { width: 60%; }
.mock-line.w90 { width: 90%; }
.mock-line.w50 { width: 50%; }
.mock-kpi {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.5rem;
  margin: 1rem 0 1.1rem;
}
.mock-kpi div {
  background: #f6f8ff;
  border: 1px solid #e7ebfa;
  border-radius: 12px;
  padding: 0.65rem 0.5rem;
  text-align: center;
}
.mock-kpi small {
  display: block;
  color: var(--muted);
  font-size: 0.7rem;
}
.mock-kpi strong {
  font-size: 1.05rem;
  color: var(--brand-dark);
}
.mock-tag {
  display: inline-block;
  margin-top: 0.3rem;
  padding: 0.35rem 0.7rem;
  border-radius: 999px;
  background: rgba(15, 159, 110, 0.1);
  color: var(--ok);
  font-size: 0.82rem;
  font-weight: 600;
}

.section { padding: 3.5rem 0; }
.section-alt { background: rgba(255, 255, 255, 0.55); border-block: 1px solid var(--line); }
.section-head { text-align: center; margin-bottom: 2rem; }
.section-head h2 { margin: 0 0 0.5rem; font-size: 1.75rem; }
.section-head p { margin: 0 auto; color: var(--muted); max-width: 36rem; }

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}
.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.25rem 1.2rem 1.35rem;
  box-shadow: 0 8px 24px rgba(35, 48, 96, 0.04);
}
.card .icon {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, rgba(91,108,255,.12), rgba(139,92,246,.12));
  margin-bottom: 0.8rem;
  font-size: 1.1rem;
}
.card h3 { margin: 0 0 0.45rem; font-size: 1.05rem; }
.card p { margin: 0; color: var(--muted); font-size: 0.95rem; }

.price-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  align-items: stretch;
}
.price-card {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.4rem 1.25rem 1.3rem;
}
.price-card.featured {
  border-color: rgba(91, 108, 255, 0.45);
  box-shadow: var(--shadow);
  transform: translateY(-4px);
}
.badge {
  position: absolute;
  top: 14px;
  right: 14px;
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  color: #fff;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
}
.price-card h3 { margin: 0 0 0.4rem; }
.price {
  margin: 0;
  font-size: 2.4rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text);
}
.price span { font-size: 1.1rem; margin-right: 0.1rem; }
.price-desc { color: var(--muted); margin: 0.2rem 0 1rem; }
.price-card ul {
  margin: 0 0 1rem;
  padding-left: 1.1rem;
  color: var(--muted);
}
.price-card li { margin: 0.3rem 0; }
.sku {
  margin: 0;
  font-size: 0.8rem;
  color: #7a849c;
  border-top: 1px dashed var(--line);
  padding-top: 0.8rem;
}
.fineprint {
  margin: 1.4rem auto 0;
  max-width: 48rem;
  text-align: center;
  color: var(--muted);
  font-size: 0.88rem;
}

.steps {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: step;
  display: grid;
  gap: 0.9rem;
}
.steps li {
  counter-increment: step;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.2rem 1rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.1rem 1.15rem;
}
.steps li::before {
  content: counter(step);
  width: 34px;
  height: 34px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  grid-row: span 2;
  align-self: center;
}
.steps strong { font-size: 1.02rem; }
.steps span { color: var(--muted); font-size: 0.95rem; }

.faq details {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 0.9rem 1.1rem;
  margin-bottom: 0.7rem;
}
.faq summary {
  cursor: pointer;
  font-weight: 600;
  list-style: none;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+";
  float: right;
  color: var(--muted);
  font-weight: 400;
}
.faq details[open] summary::after { content: "–"; }
.faq p { margin: 0.65rem 0 0.15rem; color: var(--muted); }

.contact {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 1.5rem;
  align-items: center;
}
.contact h2 { margin: 0 0 0.5rem; }
.contact > div > p { color: var(--muted); margin: 0; }
.contact-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.25rem 1.3rem;
  box-shadow: var(--shadow);
}
.contact-card p {
  margin: 0.55rem 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 0.8rem;
}
.contact-card span {
  min-width: 5rem;
  color: var(--muted);
  font-size: 0.92rem;
}

.footer {
  border-top: 1px solid var(--line);
  background: #eef1f8;
  padding: 2rem 0 2.4rem;
  margin-top: 1rem;
}
.footer-inner {
  display: grid;
  gap: 0.9rem;
}
.footer p { margin: 0.2rem 0 0; color: var(--muted); font-size: 0.92rem; }
.footer-links { display: flex; flex-wrap: wrap; gap: 1rem; }
.footer-links a { color: var(--muted); }
.copy { font-size: 0.85rem !important; }

/* legal pages */
.legal {
  padding: 3rem 0 4rem;
}
.legal h1 {
  margin: 0 0 0.4rem;
  font-size: 2rem;
}
.legal .meta {
  color: var(--muted);
  margin: 0 0 1.5rem;
  font-size: 0.92rem;
}
.legal h2 {
  margin: 1.6rem 0 0.5rem;
  font-size: 1.15rem;
}
.legal p, .legal li {
  color: var(--muted);
}
.legal ul { padding-left: 1.2rem; }
.back-link {
  display: inline-block;
  margin-bottom: 1rem;
  color: var(--muted);
  font-size: 0.92rem;
}

@media (max-width: 880px) {
  .hero-grid,
  .feature-grid,
  .price-grid,
  .contact {
    grid-template-columns: 1fr;
  }
  .price-card.featured { transform: none; }
  .hero { padding-top: 2.5rem; }
  .nav-links a:not(.btn) { display: none; }
}