/* wexin.ai Landing Page */
:root {
  --navy: #1a1a2e;
  --navy-light: #16213e;
  --green: #07C160;
  --green-dark: #06a050;
  --white: #ffffff;
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  color: var(--gray-800);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

/* Nav */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--gray-200);
  transition: box-shadow 0.3s;
}

.nav.scrolled {
  box-shadow: 0 2px 20px rgba(0,0,0,0.06);
}

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo img {
  height: 36px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-links a {
  font-size: 15px;
  color: var(--gray-600);
  transition: color 0.2s;
}

.nav-links a:hover {
  color: var(--navy);
}

.nav-cta {
  background: var(--green);
  color: var(--white) !important;
  padding: 8px 20px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 14px !important;
  transition: background 0.2s;
}

.nav-cta:hover {
  background: var(--green-dark);
}

/* Hero */
.hero {
  padding: 140px 24px 80px;
  text-align: center;
  background: linear-gradient(180deg, var(--white) 0%, var(--gray-50) 100%);
}

.hero-badge {
  display: inline-block;
  background: rgba(7, 193, 96, 0.1);
  color: var(--green);
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 14px;
  font-weight: 500;
  margin-bottom: 24px;
}

.hero h1 {
  font-size: 52px;
  font-weight: 800;
  color: var(--navy);
  line-height: 1.2;
  margin-bottom: 20px;
  letter-spacing: -0.5px;
}

.hero h1 span {
  color: var(--green);
}

.hero p {
  font-size: 20px;
  color: var(--gray-500);
  max-width: 600px;
  margin: 0 auto 40px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn-primary {
  background: var(--green);
  color: var(--white);
  padding: 14px 36px;
  border-radius: 10px;
  font-size: 17px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.btn-primary:hover {
  background: var(--green-dark);
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(7, 193, 96, 0.3);
}

.btn-secondary {
  background: var(--white);
  color: var(--navy);
  padding: 14px 36px;
  border-radius: 10px;
  font-size: 17px;
  font-weight: 600;
  border: 2px solid var(--gray-200);
  cursor: pointer;
  transition: all 0.2s;
}

.btn-secondary:hover {
  border-color: var(--navy);
}

/* Stats */
.stats {
  display: flex;
  justify-content: center;
  gap: 60px;
  margin-top: 60px;
  padding-top: 40px;
  border-top: 1px solid var(--gray-200);
}

.stat-item {
  text-align: center;
}

.stat-num {
  font-size: 36px;
  font-weight: 800;
  color: var(--navy);
}

.stat-label {
  font-size: 14px;
  color: var(--gray-500);
  margin-top: 4px;
}

/* How it works */
.section {
  padding: 100px 24px;
}

.section-alt {
  background: var(--gray-50);
}

.section-title {
  text-align: center;
  margin-bottom: 60px;
}

.section-title h2 {
  font-size: 36px;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 12px;
}

.section-title p {
  font-size: 18px;
  color: var(--gray-500);
}

.steps {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  gap: 40px;
}

.step {
  flex: 1;
  text-align: center;
  padding: 32px 24px;
}

.step-num {
  width: 56px;
  height: 56px;
  border-radius: 16px;
  background: var(--navy);
  color: var(--white);
  font-size: 24px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
}

.step h3 {
  font-size: 20px;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 10px;
}

.step p {
  font-size: 15px;
  color: var(--gray-500);
  line-height: 1.7;
}

/* Features */
.features {
  max-width: 1100px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: 16px;
  padding: 32px 28px;
  transition: all 0.2s;
}

.feature-card:hover {
  border-color: var(--green);
  box-shadow: 0 8px 30px rgba(0,0,0,0.06);
  transform: translateY(-2px);
}

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: rgba(7, 193, 96, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  margin-bottom: 20px;
}

.feature-card h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 10px;
}

.feature-card p {
  font-size: 15px;
  color: var(--gray-500);
  line-height: 1.7;
}

/* Pricing */
.pricing-card {
  max-width: 480px;
  margin: 0 auto;
  background: var(--white);
  border: 2px solid var(--green);
  border-radius: 20px;
  padding: 48px 40px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.pricing-badge {
  position: absolute;
  top: 20px;
  right: -32px;
  background: var(--green);
  color: var(--white);
  padding: 4px 40px;
  font-size: 13px;
  font-weight: 600;
  transform: rotate(45deg);
}

.pricing-card h3 {
  font-size: 24px;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 8px;
}

.pricing-card .price {
  font-size: 56px;
  font-weight: 800;
  color: var(--navy);
  margin: 20px 0;
}

.pricing-card .price span {
  font-size: 20px;
  font-weight: 400;
  color: var(--gray-500);
}

.pricing-card .price-note {
  font-size: 15px;
  color: var(--green);
  font-weight: 600;
  margin-bottom: 28px;
}

.pricing-features {
  list-style: none;
  text-align: left;
  margin-bottom: 32px;
}

.pricing-features li {
  padding: 10px 0;
  font-size: 15px;
  color: var(--gray-700);
  display: flex;
  align-items: center;
  gap: 12px;
  border-bottom: 1px solid var(--gray-100);
}

.pricing-features li::before {
  content: '✓';
  color: var(--green);
  font-weight: 700;
  font-size: 16px;
  flex-shrink: 0;
}

/* FAQ */
.faq-list {
  max-width: 700px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid var(--gray-200);
}

.faq-q {
  padding: 20px 0;
  font-size: 17px;
  font-weight: 600;
  color: var(--gray-800);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq-q::after {
  content: '+';
  font-size: 24px;
  color: var(--gray-400);
  transition: transform 0.2s;
}

.faq-item.open .faq-q::after {
  content: '−';
}

.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}

.faq-item.open .faq-a {
  max-height: 200px;
}

.faq-a p {
  padding: 0 0 20px;
  font-size: 15px;
  color: var(--gray-500);
  line-height: 1.7;
}

/* CTA */
.cta-section {
  background: var(--navy);
  padding: 80px 24px;
  text-align: center;
}

.cta-section h2 {
  font-size: 36px;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 16px;
}

.cta-section p {
  font-size: 18px;
  color: rgba(255,255,255,0.6);
  margin-bottom: 32px;
}

/* Footer */
.footer {
  background: var(--navy);
  border-top: 1px solid rgba(255,255,255,0.1);
  padding: 40px 24px;
  text-align: center;
}

.footer p {
  font-size: 14px;
  color: rgba(255,255,255,0.4);
}

/* Responsive */
@media (max-width: 768px) {
  .hero h1 { font-size: 32px; }
  .hero p { font-size: 17px; }
  .stats { gap: 30px; flex-wrap: wrap; }
  .stat-num { font-size: 28px; }
  .steps { flex-direction: column; gap: 20px; }
  .features { grid-template-columns: 1fr; }
  .section-title h2 { font-size: 28px; }
  .pricing-card { padding: 32px 24px; }
  .pricing-card .price { font-size: 42px; }
  .nav-links a:not(.nav-cta) { display: none; }
}