```css
/* Base styles */
:root {
  --primary: #3b82f6;
  --primary-hover: #2563eb;
  --text: #1e293b;
  --text-light: #64748b;
  --border: #e2e8f0;
  --bg: #f8fafc;
  --bg-card: #ffffff;
  --dark-bg: #1e293b;
  --dark-text: #f8fafc;
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

.container {
  width: 90%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Typography */
h1, h2, h3, h4 {
  font-weight: 600;
  line-height: 1.2;
}

p {
  color: var(--text-light);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border-radius: 0.5rem;
  font-weight: 500;
  transition: all 0.2s;
  cursor: pointer;
  text-decoration: none;
}

.btn-primary {
  background-color: var(--primary);
  color: white;
  border: none;
}

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

.btn-outline {
  border: 2px solid var(--primary);
  color: var(--primary);
  background: transparent;
}

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

.btn-light {
  background-color: white;
  color: var(--dark-bg);
  border: none;
}

.btn-light:hover {
  background-color: #f8f9fa;
}

/* Cards */
.card {
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  padding: 1.5rem;
  transition: all 0.2s;
}

.card:hover {
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

/* Hero Section */
.hero {
  padding: 120px 0 60px;
  text-align: center;
  background: #ffffff;
}

.hero h1 {
  font-size: 2.5rem;
  margin-bottom: 16px;
  color: var(--text);
}

.hero p {
  font-size: 1.1rem;
  max-width: 600px;
  margin: 0 auto 24px;
}

.hero-form {
  max-width: 600px;
  margin: 0 auto;
  background: white;
  padding: 24px;
  border-radius: 12px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
  border: 1px solid var(--border);
}

/* Form Elements */
.form-group {
  margin-bottom: 20px;
  text-align: left;
}

.form-group label {
  display: block;
  margin-bottom: 8px;
  font-weight: 600;
  color: #444;
}

.form-control {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 1rem;
  transition: all 0.2s;
  background-color: var(--bg);
}

.form-control:focus {
  border-color: var(--primary);
  outline: none;
}

.form-row {
  display: flex;
  gap: 20px;
}

.form-row .form-group {
  flex: 1;
}

/* Budget Slider */
.budget-slider-container {
  margin-top: 10px;
}

.budget-slider {
  width: 100%;
  height: 8px;
  border-radius: 5px;
  background: #ddd;
  outline: none;
  -webkit-appearance: none;
}

.budget-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--primary);
  cursor: pointer;
}

.budget-slider::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--primary);
  cursor: pointer;
  border: none;
}

.budget-display {
  text-align: center;
  margin-top: 10px;
  font-size: 1.2rem;
  font-weight: bold;
  color: var(--primary);
}

/* Features Section */
.features {
  padding: 80px 0;
  background-color: #f8f9fa;
}

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

.section-title h2 {
  font-size: 2.5rem;
  margin-bottom: 15px;
}

.section-title p {
  font-size: 1.1rem;
  max-width: 700px;
  margin: 0 auto;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
}

.feature-card {
  background: white;
  padding: 24px;
  border-radius: 12px;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
  text-align: center;
  transition: all 0.2s;
  border: 1px solid var(--border);
}

.feature-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
}

.feature-icon {
  font-size: 2.5rem;
  color: var(--primary);
  margin-bottom: 16px;
}

.feature-card h3 {
  font-size: 1.5rem;
  margin-bottom: 15px;
}

/* Categories Section */
.categories {
  padding: 80px 0;
}

.categories-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
}

.category-card {
  background: white;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px 16px;
  text-align: center;
  transition: all 0.2s;
  cursor: pointer;
}

.category-card:hover {
  border-color: var(--primary);
  transform: translateY(-5px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.05);
}

.category-icon {
  font-size: 2rem;
  color: var(--primary);
  margin-bottom: 12px;
}

.category-card h4 {
  font-size: 1.2rem;
}

/* Recommendations Modal */
.recommendations-modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: 1002;
  overflow-y: auto;
}

.recommendations-content {
  background-color: white;
  margin: 3% auto;
  padding: 24px;
  border-radius: 12px;
  width: 90%;
  max-width: 800px;
  position: relative;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
  border: 1px solid var(--border);
}

.close-modal {
  position: absolute;
  top: 15px;
  right: 20px;
  font-size: 2rem;
  cursor: pointer;
  color: #aaa;
}

.close-modal:hover {
  color: #333;
}

.ai-recommendation {
  background-color: #f8f9fa;
  border-left: 4px solid var(--primary);
  padding: 20px;
  margin-bottom: 30px;
  border-radius: 0 10px 10px 0;
}

.ai-disclaimer {
  font-style: italic;
  color: #e74c3c;
  font-weight: 600;
  margin-bottom: 15px;
}

.ai-suggestion {
  margin-bottom: 15px;
}

.product-list {
  margin-top: 20px;
}

.product-item {
  background-color: white;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px;
  margin-bottom: 16px;
  transition: all 0.2s;
}

.product-item:hover {
  transform: translateY(-3px);
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
}

.product-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
}

.product-name {
  font-weight: bold;
  font-size: 1.1rem;
}

.product-price {
  font-weight: 600;
  color: var(--primary);
  font-size: 1rem;
}

.product-details {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.product-source {
  display: flex;
  align-items: center;
  color: #666;
  font-size: 0.9rem;
}

.product-source i {
  margin-right: 5px;
}

.product-link {
  background-color: var(--primary);
  color: white;
  padding: 8px 16px;
  border-radius: 6px;
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: all 0.2s;
}

.product-link:hover {
  background-color: var(--primary-hover);
}

/* Experts Section */
.experts-section {
  margin-top: 30px;
}

.experts-title {
  font-size: 1.