/* Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;600;800&display=swap');

/* Base Variables */
:root {
  --navy: #111827;
  --yellow: #FACC15;
  --yellow-hover: #EAB308;
  --light-gray: #F9FAFB;
  --border-gray: #E5E7EB;
  --white: #FFFFFF;
  --text-main: #374151;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Inter', sans-serif;
}

body {
  background-color: var(--light-gray);
  color: var(--text-main);
  line-height: 1.6;
}

/* Typography */
h1, h2, h3, h4 {
  color: var(--navy);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 12px 24px;
  background-color: var(--yellow);
  color: var(--navy);
  text-decoration: none;
  font-weight: 600;
  border-radius: 2px;
  transition: 0.3s;
  border: none;
  cursor: pointer;
}

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

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

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

/* Navigation */
header {
  background-color: var(--navy);
  padding: 20px 5%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 1000;
}

.logo {
  color: var(--white);
  font-size: 24px;
  font-weight: 800;
  text-decoration: none;
}

.logo span {
  color: var(--yellow);
}

nav ul {
  list-style: none;
  display: flex;
  gap: 20px;
}

nav a {
  color: var(--white);
  text-decoration: none;
  font-size: 14px;
  font-weight: 600;
  text-transform: uppercase;
  transition: color 0.3s;
}

nav a:hover {
  color: var(--yellow);
}

/* Layout Containers */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 60px 20px;
}

.section-title {
  text-align: center;
  font-size: 32px;
  margin-bottom: 10px;
}

.section-subtitle {
  text-align: center;
  margin-bottom: 40px;
  color: #6B7280;
}

/* Grids */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }

/* Product Cards */
.card {
  background: var(--white);
  border: 1px solid var(--border-gray);
  padding: 20px;
  border-radius: 4px;
  transition: transform 0.3s, box-shadow 0.3s;
}

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

.card img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  background-color: #E5E7EB;
  margin-bottom: 15px;
}

.card h3 {
  font-size: 18px;
  margin-bottom: 15px;
  border-bottom: 2px solid var(--yellow);
  padding-bottom: 5px;
  display: inline-block;
}

.spec-list {
  list-style: none;
  margin-bottom: 20px;
  font-size: 14px;
}

.spec-list li {
  padding: 5px 0;
  border-bottom: 1px solid var(--border-gray);
}

.spec-list li strong {
  color: var(--navy);
}

/* Hero Section */
.hero {
  background: linear-gradient(rgba(17, 24, 39, 0.8), rgba(17, 24, 39, 0.8)), url('https://images.unsplash.com/photo-1541888081198-693f185f3964?auto=format&fit=crop&q=80') center/cover;
  height: 80vh;
  display: flex;
  align-items: center;
  text-align: center;
  color: var(--white);
}

.hero h1 {
  font-size: 48px;
  color: var(--white);
  margin-bottom: 20px;
}

.hero p {
  font-size: 18px;
  max-width: 700px;
  margin: 0 auto 30px;
}

/* Banner CTAs */
.cta-banner {
  background-color: var(--navy);
  color: var(--white);
  text-align: center;
  padding: 60px 20px;
}

.cta-banner h2 {
  color: var(--white);
  margin-bottom: 15px;
}

/* Forms */
.form-group { margin-bottom: 15px; }
label { display: block; font-weight: 600; margin-bottom: 5px; color: var(--navy); }
input, textarea, select { width: 100%; padding: 12px; border: 1px solid var(--border-gray); border-radius: 2px; font-family: inherit; font-size: 14px; }
input:focus, textarea:focus { outline: none; border-color: var(--navy); }

/* Footer */
footer {
  background-color: var(--navy);
  color: var(--white);
  text-align: center;
  padding: 40px 20px;
  border-top: 4px solid var(--yellow);
}

/* Responsive */
@media (max-width: 768px) {
  nav ul { 
    display: flex; 
    flex-direction: column; 
    align-items: center; 
    gap: 10px; 
    margin-top: 15px;
    margin-bottom: 15px;
  }
  .grid-2, .grid-3, .grid-4 { 
    grid-template-columns: 1fr; 
  }
  .hero h1 { 
    font-size: 32px; 
  }
  header { 
    flex-direction: column; 
    gap: 10px; 
    text-align: center;
  }
}