/* SellerLens - Core Stylesheet */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --blue-50: #E6F1FB;
  --blue-100: #B5D4F4;
  --blue-600: #185FA5;
  --blue-800: #0C447C;
  --green-50: #EAF3DE;
  --green-600: #3B6D11;
  --amber-50: #FAEEDA;
  --amber-600: #854F0B;
  --purple-50: #EEEDFE;
  --purple-600: #534AB7;
  --teal-50: #E1F5EE;
  --teal-600: #0F6E56;
  --coral-50: #FAECE7;
  --coral-600: #993C1D;
  --gray-50: #F8F8F6;
  --gray-100: #F1EFE8;
  --gray-200: #D3D1C7;
  --gray-500: #888780;
  --gray-700: #444441;
  --gray-900: #2C2C2A;
  --radius: 12px;
  --radius-sm: 8px;
}

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 15px;
  line-height: 1.65;
  color: var(--gray-900);
  background: #fff;
}

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

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

/* NAV */
.nav {
  position: sticky;
  top: 0;
  background: rgba(255,255,255,0.95);
  border-bottom: 0.5px solid var(--gray-200);
  z-index: 100;
  backdrop-filter: blur(8px);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 16px;
  font-weight: 500;
  color: var(--gray-900);
}
.nav-links {
  display: flex;
  gap: 32px;
}
.nav-links a {
  font-size: 14px;
  color: var(--gray-700);
  transition: color 0.15s;
}
.nav-links a:hover { color: var(--blue-600); }

/* HERO */
.hero {
  padding: 88px 0 80px;
  text-align: center;
  background: linear-gradient(180deg, var(--blue-50) 0%, #fff 100%);
}
.badge {
  display: inline-block;
  font-size: 12px;
  font-weight: 500;
  color: var(--blue-600);
  background: var(--blue-50);
  border: 0.5px solid var(--blue-100);
  border-radius: 20px;
  padding: 4px 14px;
  margin-bottom: 24px;
}
.hero h1 {
  font-size: 40px;
  font-weight: 500;
  line-height: 1.25;
  margin-bottom: 20px;
  color: var(--gray-900);
}
.hero-sub {
  max-width: 600px;
  margin: 0 auto 32px;
  font-size: 16px;
  color: var(--gray-700);
  line-height: 1.7;
}
.hero-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  margin-bottom: 20px;
}
.hero-note {
  font-size: 13px;
  color: var(--gray-500);
}

/* BUTTONS */
.btn-primary {
  display: inline-block;
  background: var(--blue-600);
  color: #fff;
  font-size: 14px;
  font-weight: 500;
  padding: 10px 24px;
  border-radius: var(--radius-sm);
  transition: background 0.15s;
}
.btn-primary:hover { background: var(--blue-800); }

.btn-outline {
  display: inline-block;
  background: transparent;
  color: var(--blue-600);
  font-size: 14px;
  font-weight: 500;
  padding: 10px 24px;
  border-radius: var(--radius-sm);
  border: 0.5px solid var(--blue-600);
  transition: background 0.15s, color 0.15s;
}
.btn-outline:hover { background: var(--blue-50); }

/* SECTIONS */
.section-header {
  text-align: center;
  margin-bottom: 48px;
}
.section-header h2 {
  font-size: 28px;
  font-weight: 500;
  margin-bottom: 10px;
}
.section-header p {
  font-size: 15px;
  color: var(--gray-700);
}

/* FEATURES */
.features { padding: 80px 0; }
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.feature-card {
  background: var(--gray-50);
  border: 0.5px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 28px 24px;
}
.feature-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}
.icon-blue { background: var(--blue-50); }
.icon-green { background: var(--green-50); }
.icon-amber { background: var(--amber-50); }
.icon-purple { background: var(--purple-50); }
.icon-teal { background: var(--teal-50); }
.icon-coral { background: var(--coral-50); }
.feature-card h3 { font-size: 15px; font-weight: 500; margin-bottom: 10px; }
.feature-card p { font-size: 13px; color: var(--gray-700); line-height: 1.7; }

/* HOW IT WORKS */
.how-it-works {
  padding: 80px 0;
  background: var(--gray-50);
  border-top: 0.5px solid var(--gray-200);
  border-bottom: 0.5px solid var(--gray-200);
}
.steps {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  gap: 0;
}
.step {
  max-width: 260px;
  text-align: center;
  padding: 0 20px;
}
.step-num {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--blue-600);
  color: #fff;
  font-size: 16px;
  font-weight: 500;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
}
.step h3 { font-size: 15px; font-weight: 500; margin-bottom: 8px; }
.step p { font-size: 13px; color: var(--gray-700); line-height: 1.7; }
.step-arrow {
  font-size: 22px;
  color: var(--gray-200);
  margin-top: 10px;
  flex-shrink: 0;
}

/* TRUST */
.trust { padding: 64px 0; }
.trust-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.trust-item {
  text-align: center;
  padding: 24px 16px;
  border: 0.5px solid var(--gray-200);
  border-radius: var(--radius);
}
.trust-num {
  font-size: 18px;
  font-weight: 500;
  color: var(--blue-600);
  margin-bottom: 8px;
}
.trust-label { font-size: 13px; color: var(--gray-700); line-height: 1.6; }

/* CTA */
.cta {
  padding: 80px 0;
  background: var(--blue-50);
  text-align: center;
  border-top: 0.5px solid var(--blue-100);
}
.cta h2 { font-size: 28px; font-weight: 500; margin-bottom: 12px; }
.cta p { font-size: 15px; color: var(--gray-700); margin-bottom: 28px; }

/* FOOTER */
.footer {
  background: var(--gray-100);
  border-top: 0.5px solid var(--gray-200);
  padding: 40px 0 0;
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  padding-bottom: 32px;
}
.footer-brand { max-width: 260px; }
.footer-brand .logo { margin-bottom: 8px; }
.footer-brand p { font-size: 13px; color: var(--gray-500); }
.footer-links {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
}
.footer-links a {
  font-size: 13px;
  color: var(--gray-700);
  transition: color 0.15s;
}
.footer-links a:hover { color: var(--blue-600); }
.footer-bottom {
  border-top: 0.5px solid var(--gray-200);
  padding: 16px 24px;
  text-align: center;
}
.footer-bottom p { font-size: 12px; color: var(--gray-500); }
.footer-beian {
  text-align: center;
  padding: 16px 24px 0;
}
.footer-beian .beian-link {
  font-size: 13px;
  color: var(--gray-700);
  text-decoration: none;
}
.footer-beian .beian-link:hover {
  color: var(--blue-600);
  text-decoration: underline;
}

/* PAGE HERO (inner pages) */
.page-hero {
  padding: 56px 0 48px;
  background: var(--blue-50);
  border-bottom: 0.5px solid var(--blue-100);
}
.page-hero h1 { font-size: 32px; font-weight: 500; margin-bottom: 8px; }
.page-hero p { font-size: 15px; color: var(--gray-700); }

/* CONTENT PAGE */
.page-content { padding: 56px 0 80px; max-width: 780px; }
.page-content h2 { font-size: 20px; font-weight: 500; margin: 36px 0 12px; }
.page-content h2:first-child { margin-top: 0; }
.page-content p { font-size: 14px; color: var(--gray-700); line-height: 1.8; margin-bottom: 12px; }
.page-content ul { margin: 8px 0 12px 20px; }
.page-content li { font-size: 14px; color: var(--gray-700); line-height: 1.8; margin-bottom: 6px; }

/* PRICING */
.pricing-section { padding: 80px 0; }
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  max-width: 900px;
  margin: 0 auto;
}
.pricing-card {
  border: 0.5px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 32px 28px;
  background: #fff;
}
.pricing-card.featured {
  border: 1.5px solid var(--blue-600);
  position: relative;
}
.featured-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--blue-600);
  color: #fff;
  font-size: 11px;
  font-weight: 500;
  padding: 3px 12px;
  border-radius: 20px;
  white-space: nowrap;
}
.plan-name { font-size: 14px; font-weight: 500; color: var(--gray-700); margin-bottom: 8px; }
.plan-price { font-size: 32px; font-weight: 500; color: var(--gray-900); margin-bottom: 4px; }
.plan-price span { font-size: 14px; font-weight: 400; color: var(--gray-500); }
.plan-desc { font-size: 13px; color: var(--gray-500); margin-bottom: 24px; }
.plan-features { list-style: none; margin: 0 0 28px; padding: 0; }
.plan-features li {
  font-size: 13px;
  color: var(--gray-700);
  padding: 6px 0;
  border-bottom: 0.5px solid var(--gray-100);
  display: flex;
  align-items: center;
  gap: 8px;
}
.plan-features li::before {
  content: "✓";
  color: var(--green-600);
  font-weight: 500;
  flex-shrink: 0;
}

/* CONTACT */
.contact-section { padding: 60px 0 80px; }
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: start;
}
.contact-info h2 { font-size: 22px; font-weight: 500; margin-bottom: 16px; }
.contact-info p { font-size: 14px; color: var(--gray-700); line-height: 1.8; margin-bottom: 28px; }
.contact-method {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 20px;
}
.contact-method-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: var(--blue-50);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.contact-method-text strong { display: block; font-size: 13px; font-weight: 500; margin-bottom: 2px; }
.contact-method-text span { font-size: 13px; color: var(--gray-500); }
.contact-form { background: var(--gray-50); border: 0.5px solid var(--gray-200); border-radius: var(--radius); padding: 32px; }
.form-group { margin-bottom: 18px; }
.form-group label { display: block; font-size: 13px; font-weight: 500; margin-bottom: 6px; }
.form-group input, .form-group select, .form-group textarea {
  width: 100%;
  border: 0.5px solid var(--gray-200);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  font-size: 14px;
  font-family: inherit;
  background: #fff;
  color: var(--gray-900);
  outline: none;
  transition: border-color 0.15s;
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
  border-color: var(--blue-600);
}
.form-group textarea { resize: vertical; min-height: 100px; }
.form-submit .btn-primary { width: 100%; text-align: center; padding: 12px; font-size: 14px; cursor: pointer; border: none; }

/* RESPONSIVE */
@media (max-width: 768px) {
  .hero h1 { font-size: 28px; }
  .feature-grid { grid-template-columns: 1fr; }
  .trust-grid { grid-template-columns: repeat(2, 1fr); }
  .steps { flex-direction: column; align-items: center; }
  .step-arrow { transform: rotate(90deg); margin: 8px 0; }
  .pricing-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-inner { flex-direction: column; gap: 24px; }
  .nav-links { display: none; }
}