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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
  color: #1a1a1a;
  line-height: 1.6;
  background-color: #ffffff;
}

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

/* Navigation */
.navbar {
  background: white;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 20px;
}

.logo {
  display: flex;
  flex-direction: column;
  align-items: center;
  font-size: 18px;
  font-weight: 700;
  color: #0f3460;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 32px;
}

.nav-links a {
  text-decoration: none;
  color: #555;
  font-size: 14px;
  font-weight: 500;
  transition: color 0.3s ease;
}

.nav-links a:hover {
  color: #0f3460;
}

/* Hero Section */
.hero {
  background: linear-gradient(135deg, #0f3460 0%, #533483 100%);
  color: white;
  text-align: center;
  padding: 120px 20px;
}

.hero h1 {
  font-size: 52px;
  font-weight: 700;
  margin-bottom: 20px;
  letter-spacing: -1px;
}

.hero h2 {
  color: white;
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.hero p {
  font-size: 20px;
  color: rgba(255, 255, 255, 0.95);
  margin-bottom: 40px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
  text-shadow: 0 1px 4px rgba(0, 0, 0, 0.2);
}

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

/* Headings */
h1, h2 {
  color: #0f3460;
}

h2 {
  font-size: 36px;
  margin-bottom: 30px;
  font-weight: 700;
}

h3 {
  color: #0f3460;
  font-size: 20px;
  margin-bottom: 12px;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 14px 32px;
  text-decoration: none;
  border-radius: 6px;
  font-weight: 600;
  font-size: 15px;
  transition: all 0.3s ease;
  border: 2px solid transparent;
  cursor: pointer;
}

.btn-primary {
  background: #0f3460;
  color: white;
}

.btn-primary:hover {
  background: #1a4d7a;
  transform: translateY(-2px);
  box-shadow: 0 8px 16px rgba(15, 52, 96, 0.2);
}

.btn-secondary {
  background: transparent;
  color: white;
  border-color: white;
}

.btn-secondary:hover {
  background: white;
  color: #0f3460;
}

/* Sections */
.about, .services, .product, .founder, .contact {
  padding: 80px 20px;
}

.about {
  background: #f8f9fa;
}

.about p, .product-description {
  font-size: 16px;
  color: #555;
  max-width: 700px;
  line-height: 1.8;
}

.services {
  background: white;
}

.product {
  background: #f8f9fa;
}

.founder {
  background: white;
}

.contact {
  background: #0f3460;
  color: white;
  text-align: center;
}

.contact h2 {
  color: white;
  margin-bottom: 15px;
}

.contact-intro {
  font-size: 18px;
  margin-bottom: 40px;
  color: rgba(255, 255, 255, 0.9);
}

/* Grid Layout */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
  margin-bottom: 40px;
}

/* Cards */
.card {
  padding: 32px;
  border-radius: 12px;
  background: white;
  text-align: center;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  border: 1px solid #f0f0f0;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.12);
}

.card p {
  color: #666;
  font-size: 15px;
  line-height: 1.6;
  text-align: justify;
}

/* Product Features */
.product-features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
  margin: 40px 0;
}

.feature-item {
  padding: 24px;
  background: white;
  border-radius: 10px;
  text-align: center;
  font-weight: 500;
  color: #0f3460;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

/* Images */
.product-img {
  width: 100%;
  max-width: 600px;
  border-radius: 12px;
  margin: 40px auto;
  display: block;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
}

.subtitle {
  color: #666;
  font-size: 18px;
  margin-bottom: 20px;
}

.product-status {
  margin: 30px 0;
  font-style: italic;
  color: #666;
}

.product-status a {
  color: #0f3460;
  text-decoration: none;
  font-weight: 600;
}

.product-status a:hover {
  text-decoration: underline;
}

/* Founder Section */
.founder-content p {
  font-size: 16px;
  color: #555;
  margin-bottom: 16px;
  line-height: 1.8;
  max-width: 700px;
}

/* Contact Links */
.contact-links {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
  margin-top: 50px;
}

.contact-item {
  padding: 32px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 12px;
  text-decoration: none;
  color: white;
  transition: all 0.3s ease;
  border: 2px solid rgba(255, 255, 255, 0.2);
}

.contact-item:hover {
  background: rgba(255, 255, 255, 0.2);
  border-color: white;
  transform: translateY(-4px);
}

.contact-item strong {
  display: block;
  margin-bottom: 8px;
  font-size: 16px;
}

/* Feedback Form */
.feedback {
  padding: 80px 20px;
  background: #f8f9fa;
}

.feedback h2 {
  margin-bottom: 12px;
  text-align: center;
  color: #0f3460;
}

.feedback-intro {
  text-align: center;
  font-size: 16px;
  color: #666;
  margin-bottom: 40px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.feedback-form {
  max-width: 600px;
  margin: 0 auto;
  background: white;
  padding: 40px;
  border-radius: 8px;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
}

.form-group {
  margin-bottom: 24px;
}

.form-group label {
  display: block;
  margin-bottom: 8px;
  font-weight: 500;
  color: #1a1a1a;
  font-size: 14px;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid #ddd;
  border-radius: 6px;
  font-family: inherit;
  font-size: 14px;
  color: #1a1a1a;
  transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: #0f3460;
  box-shadow: 0 0 0 3px rgba(15, 52, 96, 0.1);
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

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

.form-note {
  text-align: center;
  margin-top: 20px;
  font-size: 13px;
  color: #666;
}

.form-note strong {
  color: #0f3460;
}

/* Form Status Messages */
.form-status {
  display: none;
  padding: 14px 16px;
  border-radius: 6px;
  margin-bottom: 20px;
  font-size: 14px;
  font-weight: 500;
}

.form-status-success {
  background: #d4edda;
  color: #155724;
  border: 1px solid #c3e6cb;
}

.form-status-error {
  background: #f8d7da;
  color: #721c24;
  border: 1px solid #f5c6cb;
}

.feedback-form button:disabled {
  opacity: 0.7;
  cursor: not-allowed;
}

/* Footer */
footer {
  text-align: center;
  padding: 40px 20px;
  background: #0a1f2e;
  color: rgba(255, 255, 255, 0.7);
  font-size: 14px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

/* Responsive */
@media (max-width: 768px) {
  .nav-links {
    gap: 20px;
    font-size: 13px;
  }
  
  .hero h1 {
    font-size: 36px;
  }
  
  .hero p {
    font-size: 16px;
  }
  
  h2 {
    font-size: 28px;
  }
  
  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }
  
  .hero-buttons .btn {
    width: 100%;
    max-width: 300px;
  }
  
  .product-img {
    max-width: 100%;
  }
}