/* Square-inspired theme: Black, White, Clean, Sleek */

:root {
  --black: #000000;
  --white: #FFFFFF;
  --gray-light: #F5F5F5;
  --gray-medium: #E5E5E5;
  --gray-dark: #666666;
  --gray-darker: #333333;
  --accent: #006AFF;
  --spacing-xs: 8px;
  --spacing-sm: 16px;
  --spacing-md: 32px;
  --spacing-lg: 64px;
  --spacing-xl: 96px;
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  color: var(--black);
  background: var(--white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

/* Navigation */
.navbar {
  background: var(--white);
  border-bottom: 1px solid var(--gray-medium);
  padding: var(--spacing-sm) 0;
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(10px);
  background: rgba(255, 255, 255, 0.95);
}

.navbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-weight: 600;
  font-size: 18px;
}

.logo-square {
  width: 32px;
  height: 32px;
  background: var(--black);
  border-radius: 4px;
  position: relative;
}

.logo-square::after {
  content: '';
  position: absolute;
  top: 6px;
  left: 6px;
  width: 20px;
  height: 20px;
  border: 2px solid var(--white);
  border-radius: 2px;
}

.brand-name {
  color: var(--black);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.nav-links a {
  color: var(--gray-darker);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s;
}

.nav-links a:hover {
  color: var(--black);
}

/* Buttons */
.btn-primary {
  background: var(--black);
  color: var(--white);
  padding: 12px 24px;
  border-radius: 4px;
  text-decoration: none;
  font-weight: 500;
  display: inline-block;
  transition: all 0.2s;
  border: 2px solid var(--black);
}

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

.btn-secondary {
  background: var(--white);
  color: var(--black);
  padding: 12px 24px;
  border-radius: 4px;
  text-decoration: none;
  font-weight: 500;
  display: inline-block;
  transition: all 0.2s;
  border: 2px solid var(--black);
}

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

.btn-large {
  padding: 16px 32px;
  font-size: 16px;
}

/* Hero Section */
.hero {
  padding: var(--spacing-xl) 0;
  background: var(--white);
}

.hero .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-xl);
  align-items: center;
}

.hero-title {
  font-size: 56px;
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: var(--spacing-md);
  color: var(--black);
}

.hero-subtitle {
  font-size: 20px;
  color: var(--gray-dark);
  margin-bottom: var(--spacing-lg);
  line-height: 1.5;
}

.hero-cta {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.bubble-preview {
  width: 200px;
  height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.bubble-icon {
  width: 120px;
  height: 120px;
  background: var(--black);
  border-radius: 50%;
  position: relative;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

.bubble-icon::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 60px;
  height: 60px;
  border: 3px solid var(--white);
  border-radius: 8px;
}

/* Features Section */
.features {
  padding: var(--spacing-xl) 0;
  background: var(--gray-light);
}

.section-title {
  font-size: 42px;
  font-weight: 700;
  text-align: center;
  margin-bottom: var(--spacing-lg);
  color: var(--black);
}

.section-subtitle {
  text-align: center;
  font-size: 18px;
  color: var(--gray-dark);
  margin-bottom: var(--spacing-lg);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

.feature-card {
  background: var(--white);
  padding: var(--spacing-md);
  border-radius: 8px;
  border: 1px solid var(--gray-medium);
  transition: all 0.2s;
}

.feature-card:hover {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
  transform: translateY(-2px);
}

.feature-icon {
  font-size: 32px;
  margin-bottom: var(--spacing-sm);
}

.feature-card h3 {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
  color: var(--black);
}

.feature-card p {
  color: var(--gray-dark);
  line-height: 1.6;
}

/* How It Works */
.how-it-works {
  padding: var(--spacing-xl) 0;
  background: var(--white);
}

.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-lg);
}

.step {
  text-align: center;
}

.step-number {
  width: 64px;
  height: 64px;
  background: var(--black);
  color: var(--white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  font-weight: 700;
  margin: 0 auto var(--spacing-md);
}

.step h3 {
  font-size: 24px;
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
  color: var(--black);
}

.step p {
  color: var(--gray-dark);
}

/* Download Section */
.download {
  padding: var(--spacing-xl) 0;
  background: var(--black);
  color: var(--white);
}

.download .section-title {
  color: var(--white);
}

.download .section-subtitle {
  color: var(--gray-medium);
}

.download-buttons {
  display: flex;
  justify-content: center;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
  margin-top: var(--spacing-lg);
}

.btn-download {
  background: var(--white);
  color: var(--black);
  padding: 16px 32px;
  border-radius: 4px;
  text-decoration: none;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  transition: all 0.2s;
  border: 2px solid var(--white);
}

.btn-download:hover {
  background: var(--gray-light);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(255, 255, 255, 0.2);
}

.download-icon {
  font-size: 20px;
}

.download-note {
  text-align: center;
  margin-top: var(--spacing-md);
  color: var(--gray-medium);
  font-size: 14px;
}

/* Footer */
.footer {
  background: var(--black);
  color: var(--white);
  padding: var(--spacing-lg) 0 var(--spacing-md);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-md);
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-weight: 600;
}

.footer-brand .logo-square {
  background: var(--white);
}

.footer-brand .logo-square::after {
  border-color: var(--black);
}

.footer-links {
  display: flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

.footer-links a {
  color: var(--gray-medium);
  text-decoration: none;
  transition: color 0.2s;
}

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

.footer-bottom {
  text-align: center;
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--gray-darker);
  color: var(--gray-medium);
  font-size: 14px;
}

/* Responsive */
@media (max-width: 768px) {
  .hero .container {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-title {
    font-size: 36px;
  }

  .hero-cta {
    justify-content: center;
  }

  .nav-links {
    gap: var(--spacing-sm);
  }

  .features-grid {
    grid-template-columns: 1fr;
  }

  .steps {
    grid-template-columns: 1fr;
  }

  .footer-content {
    flex-direction: column;
    text-align: center;
  }
}