/* Design System */
:root {
  /* Colors */
  --primary-color: #2563EB; /* Vibrant Tech Blue */
  --primary-hover: #1D4ED8;
  --text-dark: #1F2937;
  --text-medium: #4B5563;
  --text-light: #9CA3AF;
  --bg-light: #F3F4F6;
  --bg-white: #FFFFFF;
  --border-color: #E5E7EB;
  --success-color: #10B981;
  
  /* Typography */
  --font-family: 'Inter', system-ui, -apple-system, sans-serif;
  
  /* Spacing */
  --container-width: 1200px;
  --header-height: 80px;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  
  /* Radius */
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-full: 9999px;
}

/* Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

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

img {
  max-width: 100%;
  display: block;
}

a {
  text-decoration: none;
  color: inherit;
}

ul {
  list-style: none;
}

/* Utilities */
.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: all 0.2s ease;
  cursor: pointer;
  border: none;
}

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

.btn-primary:hover {
  background-color: var(--primary-hover);
  transform: translateY(-1px);
}

.btn-secondary {
  background-color: white;
  color: var(--primary-color);
  border: 1px solid var(--border-color); /* Fallback */
  border: 1px solid var(--primary-color);
}

.btn-secondary:hover {
  background-color: var(--bg-light);
}

.text-center { text-align: center; }
.mb-1 { margin-bottom: 1rem; }
.mb-2 { margin-bottom: 2rem; }
.mb-4 { margin-bottom: 4rem; }

/* Header */
header {
  height: var(--header-height);
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(10px);
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
}

.logo {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--primary-color);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

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

.nav-menu {
  display: flex;
  gap: 2rem;
  align-items: center;
}

.nav-link {
  font-weight: 500;
  color: var(--text-medium);
}

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

.lang-switch {
  display: flex;
  gap: 0.5rem;
  font-weight: 600;
}

.lang-switch a {
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius-md);
}

.lang-switch a.active {
  background-color: var(--bg-light);
  color: var(--primary-color);
}

/* Mobile Menu Toggle */
.mobile-toggle {
  display: none;
  font-size: 1.5rem;
  cursor: pointer;
}

/* Hero Section */
.hero {
  padding: calc(var(--header-height) + 4rem) 0 4rem;
  min-height: 90vh; /* Fill screen mostly */
  display: flex;
  align-items: center;
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.hero-text h1 {
  font-size: 3.5rem; /* Big impact */
  line-height: 1.1;
  font-weight: 800;
  margin-bottom: 1.5rem;
  background: linear-gradient(to right, var(--text-dark), var(--primary-color));
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-text p {
  font-size: 1.25rem;
  color: var(--text-medium);
  margin-bottom: 2rem;
  max-width: 500px;
}

.hero-text .btn-primary {
  margin-right: 1rem;
}

.hero-image {
  position: relative;
}

.app-mockup {
  border-radius: 2rem;
  box-shadow: var(--shadow-lg);
  border: 8px solid var(--text-dark); /* Phone border */
  overflow: hidden;
  background: var(--bg-white);
  /*aspect-ratio: 9/19.5; !* Mobile ratio *!*/
  max-width: 320px;
  margin: 0 auto;
}

.app-mockup img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Store Buttons */
.store-buttons {
  display: flex;
  gap: 1.5rem;
  margin-top: 3rem;
  align-items: center;
}
.store-btn img {
  height: 48px;
  width: auto;
  transition: transform 0.2s ease;
}
.store-btn:hover img {
  transform: translateY(-2px);
}

/* Features */
.features {
  padding: 6rem 0;
  background-color: var(--bg-light);
}

.section-title {
  text-align: center;
  margin-bottom: 4rem;
}

.section-title h2 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.section-title p {
  color: var(--text-medium);
  max-width: 600px;
  margin: 0 auto;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.feature-card {
  background: white;
  padding: 2rem;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s;
}

.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
}

.feature-icon {
  width: 3rem;
  height: 3rem;
  background: var(--bg-light);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary-color);
  margin-bottom: 1.5rem;
  font-size: 1.5rem;
}

.feature-card h3 {
  font-size: 1.25rem;
  margin-bottom: 0.75rem;
}

.feature-card p {
  color: var(--text-medium);
}

/* Showcase / Slider (Simplified) */
.showcase {
  padding: 6rem 0;
}

.showcase-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.showcase-item {
    border-radius: 1.5rem;
    overflow: hidden;
    box-shadow: var(--shadow-md);
    background: #fff; /* Placeholder background */
}

/* Footer */
footer {
  background: var(--text-dark);
  color: white;
  padding: 4rem 0 2rem;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 2rem;
  margin-bottom: 3rem;
}

.footer-brand h3 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

.footer-links ul li {
  margin-bottom: 0.75rem;
}

.footer-links a {
  color: var(--text-light);
}

.footer-links a:hover {
  color: white;
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 2rem;
  text-align: center;
  color: var(--text-light);
  font-size: 0.875rem;
}

/* Responsive */
@media (max-width: 960px) {
  .hero-content {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .hero-text h1 {
    font-size: 2.75rem;
  }

  .hero-text {
      display: flex;
      flex-direction: column;
      align-items: center;
  }

  .store-buttons {
    justify-content: center;
    margin-top: 2.5rem;
  }

  .hero-text .btn-primary {
    margin-bottom: 1rem;
    margin-right: 0rem;
  }
}

@media (max-width: 768px) {
  .mobile-toggle {
    display: block;
  }

  .nav-menu {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    width: 100%;
    background: white;
    flex-direction: column;
    padding: 2rem;
    box-shadow: var(--shadow-md);
  }

  .nav-menu.active {
    display: flex;
  }
  
  .hero-text h1 {
      font-size: 2.25rem;
  }
}