:root {
  --primary: #2563EB;
  --primary-dark: #1E40AF;
  --accent: #F59E0B;
  --accent-dark: #D97706;
  --pink: #EC4899;
  --bg: #F8FAFC;
  --card-bg: #FFFFFF;
  --text: #1E293B;
  --text-light: #64748B;
  --border: #E2E8F0;
  --gradient: linear-gradient(135deg, #2563EB 0%, #4F46E5 50%, #9333EA 100%);
  --gradient-accent: linear-gradient(135deg, #F59E0B 0%, #EC4899 100%);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
}

.ai-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

header {
  background: #fff;
  box-shadow: 0 2px 10px rgba(0,0,0,0.05);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.nav-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.logo-wrapper {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

.logo-wrapper img {
  height: 40px;
}

.brand-name {
  font-size: 22px;
  font-weight: 800;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-menu {
  display: flex;
  gap: 25px;
  list-style: none;
}

.nav-menu a {
  text-decoration: none;
  color: var(--text);
  font-weight: 600;
  font-size: 15px;
  transition: color 0.3s;
}

.nav-menu a:hover {
  color: var(--primary);
}

.menu-toggle {
  display: none;
  font-size: 24px;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text);
}

.hero {
  background: var(--gradient);
  color: #fff;
  padding: 80px 0;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: rgba(255,255,255,0.1);
  border-radius: 50%;
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
}

.hero h1 {
  font-size: 42px;
  font-weight: 800;
  margin-bottom: 20px;
  line-height: 1.2;
}

.hero p {
  font-size: 18px;
  opacity: 0.9;
  margin-bottom: 30px;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.btn-group {
  display: flex;
  gap: 15px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: 12px 30px;
  border-radius: 30px;
  font-weight: 700;
  text-decoration: none;
  transition: all 0.3s ease;
  border: none;
  cursor: pointer;
  font-size: 16px;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 4px 15px rgba(245, 158, 11, 0.4);
}

.btn-primary:hover {
  background: var(--accent-dark);
  transform: translateY(-2px);
}

.btn-outline {
  background: transparent;
  color: #fff;
  border: 2px solid #fff;
}

.btn-outline:hover {
  background: #fff;
  color: var(--primary);
}

section {
  padding: 70px 0;
}

.section-title {
  text-align: center;
  margin-bottom: 50px;
}

.section-title h2 {
  font-size: 32px;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 10px;
}

.section-title p {
  color: var(--text-light);
  font-size: 16px;
}

.section-title h2 span {
  color: var(--primary);
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.card {
  background: var(--card-bg);
  border-radius: 16px;
  padding: 30px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.05);
  transition: all 0.3s ease;
  border: 1px solid var(--border);
  height: 100%;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 30px rgba(37, 99, 235, 0.1);
  border-color: var(--primary);
}

.card-icon {
  width: 60px;
  height: 60px;
  border-radius: 12px;
  background: var(--gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 28px;
  margin-bottom: 20px;
}

.card h3 {
  font-size: 20px;
  margin-bottom: 10px;
  color: var(--text);
}

.card p {
  color: var(--text-light);
  font-size: 15px;
}

.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tag {
  background: #EFF6FF;
  color: var(--primary);
  padding: 8px 16px;
  border-radius: 20px;
  font-size: 14px;
  font-weight: 600;
  border: 1px solid #DBEAFE;
  transition: all 0.3s;
}

.tag:hover {
  background: var(--primary);
  color: #fff;
}

.process-steps {
  display: flex;
  justify-content: space-between;
  position: relative;
}

.process-steps::before {
  content: '';
  position: absolute;
  top: 30px;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--border);
  z-index: 0;
}

.step {
  text-align: center;
  position: relative;
  z-index: 1;
  flex: 1;
}

.step-num {
  width: 60px;
  height: 60px;
  background: #fff;
  border: 2px solid var(--primary);
  color: var(--primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  font-weight: 800;
  margin: 0 auto 15px;
}

.step h4 {
  margin-bottom: 8px;
  font-size: 18px;
}

.step p {
  font-size: 14px;
  color: var(--text-light);
  padding: 0 10px;
}

.image-box {
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.image-box img {
  width: 100%;
  height: auto;
  display: block;
}

.rating-box {
  background: var(--gradient);
  color: #fff;
  border-radius: 20px;
  padding: 40px;
  text-align: center;
}

.rating-score {
  font-size: 64px;
  font-weight: 800;
  line-height: 1;
  margin: 10px 0;
}

.stars {
  color: var(--accent);
  font-size: 24px;
  margin-bottom: 15px;
}

.review-card {
  background: #fff;
  border-radius: 12px;
  padding: 25px;
  box-shadow: 0 4px 15px rgba(0,0,0,0.05);
  border-left: 4px solid var(--primary);
}

.review-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 15px;
}

.review-avatar {
  width: 40px;
  height: 40px;
  background: var(--gradient);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 700;
}

.review-name {
  font-weight: 700;
  font-size: 16px;
}

.review-text {
  color: var(--text-light);
  font-size: 14px;
}

.faq-item {
  border: 1px solid var(--border);
  border-radius: 10px;
  margin-bottom: 15px;
  overflow: hidden;
}

.faq-q {
  padding: 18px 20px;
  background: #fff;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 700;
  transition: background 0.3s;
}

.faq-q:hover {
  background: #F1F5F9;
}

.faq-q i {
  transition: transform 0.3s;
}

.faq-item.active .faq-q i {
  transform: rotate(180deg);
}

.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
  padding: 0 20px;
  background: #F8FAFC;
  color: var(--text-light);
}

.faq-item.active .faq-a {
  max-height: 300px;
  padding: 20px;
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: 12px 15px;
  border: 1px solid var(--border);
  border-radius: 8px;
  margin-bottom: 15px;
  font-family: inherit;
  font-size: 14px;
}

.contact-form button {
  width: 100%;
}

footer {
  background: #1E293B;
  color: #CBD5E1;
  padding: 50px 0 20px;
  margin-top: 70px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 30px;
}

.footer-col h4 {
  color: #fff;
  font-size: 18px;
  margin-bottom: 20px;
}

.footer-col p,
.footer-col a {
  color: #94A3B8;
  text-decoration: none;
  margin-bottom: 10px;
  display: block;
  font-size: 14px;
}

.footer-col a:hover {
  color: #fff;
}

.footer-bottom {
  border-top: 1px solid #334155;
  padding-top: 20px;
  text-align: center;
  font-size: 14px;
  color: #94A3B8;
}

.footer-bottom a {
  color: #94A3B8;
  text-decoration: none;
  margin: 0 5px;
}

.qr-box {
  text-align: center;
}

.qr-box img {
  width: 120px;
  height: 120px;
  border-radius: 8px;
  object-fit: cover;
  margin-bottom: 10px;
}

.hidden {
  display: none;
}

@media (max-width: 768px) {
  .nav-menu {
    display: none;
    position: absolute;
    top: 70px;
    left: 0;
    width: 100%;
    background: #fff;
    flex-direction: column;
    padding: 20px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
  }

  .nav-menu.active {
    display: flex;
  }

  .menu-toggle {
    display: block;
  }

  .hero h1 {
    font-size: 28px;
  }

  .grid-2, .grid-3, .grid-4 {
    grid-template-columns: 1fr;
  }

  .process-steps {
    flex-direction: column;
    gap: 30px;
  }

  .process-steps::before {
    display: none;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }
}

.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

.bg-light-blue {
  background-color: #EFF6FF;
}