:root {
  --bg-color: #000000;
  --bg-secondary: #1d1d1f;
  --text-primary: #f5f5f7;
  --text-secondary: #86868b;
  --accent-color: #0071e3;
  --accent-hover: #0077ed;
  --nav-bg: rgba(0, 0, 0, 0.8);
  --border-color: #424245;
  --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --max-width: 1200px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-stack);
  background-color: var(--bg-color);
  color: var(--text-primary);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* Typography */
h1, h2, h3, h4 {
  font-weight: 600;
  color: var(--text-primary);
}

a {
  text-decoration: none;
  color: inherit;
  transition: color 0.3s ease;
}

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

/* Utilities */
.section-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

.btn {
  display: inline-block;
  padding: 12px 24px;
  border-radius: 980px;
  font-size: 17px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s ease;
  text-align: center;
}

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

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

.btn.secondary {
  background-color: transparent;
  color: var(--accent-color);
  border: 1px solid var(--accent-color); /* Added border for visibility */
  margin-left: 10px;
}

.btn.secondary:hover {
  background-color: rgba(0, 113, 227, 0.1);
}

/* Animations */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

.animate-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}

.delay-1 { transition-delay: 0.1s; }
.delay-2 { transition-delay: 0.2s; }
.delay-3 { transition-delay: 0.3s; }

/* Navigation */
.navbar {
  position: fixed;
  top: 0;
  width: 100%;
  height: 48px;
  background-color: var(--nav-bg);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  z-index: 1000;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.nav-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-weight: 600;
  font-size: 1.2rem;
  color: #fff;
  opacity: 0.9;
}

.logo:hover {
  opacity: 1;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 30px;
}

.nav-links a {
  font-size: 12px;
  color: #f5f5f7;
  opacity: 0.8;
  transition: opacity 0.3s;
}

.nav-links a:hover {
  opacity: 1;
}

.mobile-menu-btn {
  display: none;
  flex-direction: column;
  gap: 4px;
  cursor: pointer;
}

.mobile-menu-btn span {
  width: 20px;
  height: 2px;
  background-color: #fff;
}

/* Hero Section */
.hero {
  height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 100px 20px 40px;
  background-color: #000;
}

.hero h1 {
  font-size: 56px;
  line-height: 1.07143;
  letter-spacing: -0.005em;
  margin-bottom: 16px;
  background: linear-gradient(180deg, #fff 0%, #b0b0b0 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero p {
  font-size: 24px;
  line-height: 1.2;
  font-weight: 400;
  max-width: 600px;
  margin-bottom: 30px;
}

.image-placeholder {
  background-color: #333;
  color: #666;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 20px;
  font-weight: bold;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.hero-visual .image-placeholder {
  width: 80vw;
  max-width: 800px;
  height: 400px;
  margin-top: 40px;
  background: linear-gradient(135deg, #1d1d1f 0%, #333 100%);
  box-shadow: 0 20px 40px rgba(0,0,0,0.5);
}

/* Profile Section */
.profile {
  padding: 100px 0;
  background-color: #f5f5f7; /* Light background for contrast */
  color: #1d1d1f;
}

.profile h2, .profile h3 {
  color: #1d1d1f;
}

.profile p {
  color: #666;
}

.profile-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.image-placeholder.portrait {
  width: 100%;
  aspect-ratio: 3/4;
  background-color: #ddd;
  color: #999;
}

.profile-text h2 {
  font-size: 48px;
  margin-bottom: 10px;
}

.profile-text h3 {
  font-size: 32px;
  margin-bottom: 20px;
  font-weight: 500;
  color: #86868b;
}

.profile-text p {
  font-size: 19px;
  line-height: 1.4;
  margin-bottom: 20px;
}

/* Products Section */
.products {
  padding: 100px 0;
  background-color: #000;
  text-align: center;
}

.section-title {
  font-size: 48px;
  margin-bottom: 10px;
}

.section-subtitle {
  font-size: 24px;
  margin-bottom: 60px;
}

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

.product-card {
  background-color: #1d1d1f;
  border-radius: 20px;
  overflow: hidden;
  transition: transform 0.3s ease;
}

.product-card:hover {
  transform: scale(1.02);
}

.card-image {
  padding: 20px;
}

.image-placeholder.card-ph {
  width: 100%;
  height: 200px;
  background-color: #333;
  border-radius: 12px;
}

.card-content {
  padding: 20px 30px 40px;
  text-align: left;
}

.card-content h3 {
  font-size: 24px;
  margin-bottom: 8px;
}

.card-content p {
  font-size: 17px;
  margin-bottom: 20px;
}

.learn-more {
  color: var(--accent-color);
  font-size: 17px;
}

.learn-more:hover {
  text-decoration: underline;
}

/* Partnership Section */
.partnership {
  padding: 100px 0;
  background-color: #f5f5f7;
  color: #1d1d1f;
  text-align: center;
}

.partnership h2 {
  color: #1d1d1f;
  font-size: 48px;
  margin-bottom: 20px;
}

.contact-form {
  max-width: 600px;
  margin: 40px auto;
  text-align: left;
}

.form-group {
  margin-bottom: 20px;
}

input, textarea {
  width: 100%;
  padding: 16px;
  border: 1px solid #d2d2d7;
  border-radius: 12px;
  font-size: 17px;
  background-color: #fff;
  font-family: inherit;
}

input:focus, textarea:focus {
  outline: none;
  border-color: var(--accent-color);
  box-shadow: 0 0 0 4px rgba(0,113,227,0.1);
}

.partnership .btn.primary {
  width: 100%;
}

/* Footer */
.footer {
  padding: 60px 0 20px;
  background-color: #f5f5f7;
  color: #1d1d1f;
  border-top: 1px solid #d2d2d7;
  font-size: 12px;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
  margin-bottom: 40px;
}

.footer-col h4 {
  font-size: 12px;
  font-weight: 600;
  color: #1d1d1f;
  margin-bottom: 10px;
}

.footer-col ul {
  list-style: none;
}

.footer-col ul li {
  margin-bottom: 8px;
}

.footer-col ul li a {
  color: #515154;
}

.footer-col ul li a:hover {
  text-decoration: underline;
  color: #1d1d1f;
}

.footer-bottom {
  border-top: 1px solid #d2d2d7;
  padding-top: 20px;
  color: #86868b;
}

/* Responsive */
@media (max-width: 768px) {
  .hero h1 { 
    font-size: 40px; 
    line-height: 1.1;
  }
  
  .hero p {
    font-size: 20px;
  }

  .section-title {
    font-size: 36px;
  }
  
  .profile-text h2 {
    font-size: 36px;
  }

  .profile-grid { 
    grid-template-columns: 1fr; 
    gap: 40px;
  }
  
  .profile-text {
    text-align: center;
  }

  .hero, .profile, .products, .partnership {
    padding: 60px 20px;
  }

  .hero-visual .image-placeholder {
    width: 100%;
    height: 300px;
  }

  .product-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 30px;
    text-align: center;
  }
  
  .nav-links { 
    display: none; 
    flex-direction: column;
    width: 100%;
    position: absolute;
    top: 48px;
    left: 0;
    background-color: rgba(0,0,0,0.95);
    padding: 20px 0;
    align-items: center;
    gap: 20px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
  } 

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

  .nav-links a {
    font-size: 18px; /* Larger tap targets */
  }

  .mobile-menu-btn { display: flex; }
}