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

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background-color: #ffffff;
  color: #1f2937;
  line-height: 1.6;
}

/* Header */
.header {
  background-color: #ffffff;
  border-bottom: 1px solid #f3f4f6;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo-section {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  min-width: fit-content;
}

.logo {
  width: 40px;
  height: 40px;
  background-color: #3b82f6;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  font-weight: bold;
  font-size: 18px;
  flex-shrink: 0;
}

.platform-name {
  font-size: 18px;
  font-weight: 600;
  color: #111827;
}

.nav {
  display: flex;
  align-items: center;
  gap: 2rem;
  flex: 1;
  justify-content: center;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  color: #374151;
  text-decoration: none;
  font-size: 14px;
  transition: color 0.2s;
  padding: 0.5rem;
}

.nav-item:hover {
  color: #3b82f6;
}

.nav-icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.login-btn {
  background-color: #3b82f6;
  color: #ffffff;
  border: none;
  padding: 0.5rem 1.5rem;
  border-radius: 9999px;
  font-weight: 500;
  cursor: pointer;
  transition: background-color 0.2s;
}

.login-btn:hover {
  background-color: #2563eb;
}

/* Hero Section */
.hero {
  background: linear-gradient(to bottom, #eff6ff, #ffffff);
  padding: 5rem 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 500px;
}

.hero-content {
  max-width: 56rem;
  margin: 0 auto;
  text-align: center;
}

.hero-title {
  font-size: clamp(2.25rem, 8vw, 3.75rem);
  font-weight: bold;
  color: #111827;
  margin-bottom: 1rem;
  line-height: 1.2;
}

.hero-highlight {
  color: #3b82f6;
}

.hero-subtitle {
  font-size: 1.125rem;
  color: #4b5563;
  margin-bottom: 3rem;
  line-height: 1.6;
}

.hero-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 2rem;
  border-radius: 9999px;
  font-weight: 500;
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.2s;
  border: none;
}

.btn-primary {
  background-color: #3b82f6;
  color: #ffffff;
}

.btn-primary:hover {
  background-color: #2563eb;
  transform: translateY(-2px);
}

.btn-secondary {
  background-color: transparent;
  color: #4b5563;
  border: 2px solid #d1d5db;
}

.btn-secondary:hover {
  background-color: transparent;
  color: #111827;
  border-color: #9ca3af;
}

.btn-icon {
  width: 20px;
  height: 20px;
}

/* Features Section */
.features {
  background-color: #f9fafb;
  padding: 4rem 1rem;
}

.features-container {
  max-width: 1280px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.feature-card {
  background-color: #ffffff;
  border-radius: 1rem;
  padding: 2rem;
  transition: box-shadow 0.2s;
}

.feature-card:hover {
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.08);
}

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: 0.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
}

.feature-icon svg {
  width: 24px;
  height: 24px;
  stroke: currentColor;
}

.feature-icon-blue {
  background-color: #eff6ff;
  color: #3b82f6;
}

.feature-icon-yellow {
  background-color: #fef3c7;
  color: #eab308;
}

.feature-icon-green {
  background-color: #dcfce7;
  color: #22c55e;
}

.feature-icon-purple {
  background-color: #f3e8ff;
  color: #a855f7;
}

.feature-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: #111827;
  margin-bottom: 0.75rem;
}

.feature-description {
  font-size: 0.875rem;
  color: #4b5563;
  margin-bottom: 1.5rem;
  line-height: 1.6;
}

.feature-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: #3b82f6;
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s;
}

.feature-link:hover {
  color: #2563eb;
}

.link-arrow {
  width: 16px;
  height: 16px;
}

/* Responsive */
@media (max-width: 768px) {
  .header-container {
    flex-wrap: wrap;
    height: auto;
    padding: 0.75rem 1rem;
  }

  .nav {
    display: none;
  }

  .hero-title {
    font-size: 2rem;
  }

  .hero-subtitle {
    font-size: 1rem;
  }

  .hero-buttons {
    flex-direction: column;
    gap: 0.75rem;
  }

  .btn {
    width: 100%;
    justify-content: center;
  }

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

  .feature-card {
    padding: 1.5rem;
  }
}

@media (max-width: 480px) {
  .header-container {
    justify-content: space-between;
  }

  .platform-name {
    font-size: 16px;
  }

  .hero-title {
    font-size: 1.5rem;
  }

  .hero-subtitle {
    font-size: 0.875rem;
    margin-bottom: 2rem;
  }

  .feature-card {
    padding: 1rem;
  }

  .feature-title {
    font-size: 1.125rem;
  }
}