/* Sense Website - Global Styles */
/* Design Principles: Clarity over impressiveness. Utility over aesthetics. Simplicity over sophistication. */

:root {
  /* Colors - Muted, confident, no-nonsense */
  --color-bg: #ffffff;
  --color-text: #1a1a1a;
  --color-text-muted: #666666;
  --color-accent: #0066cc;
  --color-accent-hover: #0052a3;
  --color-border: #e0e0e0;
  --color-bg-alt: #f8f8f8;
  --color-success: #00aa44;

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", Monaco, "Cascadia Code", "Courier New", monospace;

  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 4rem;
  --space-xl: 6rem;

  /* Layout */
  --max-width: 1200px;
  --max-width-narrow: 800px;
}

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

html {
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.2;
  margin-bottom: var(--space-sm);
}

h1 {
  font-size: 3rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 2.25rem;
  letter-spacing: -0.01em;
}

h3 {
  font-size: 1.5rem;
}

h4 {
  font-size: 1.25rem;
}

p {
  margin-bottom: var(--space-sm);
  color: var(--color-text);
  line-height: 1.7;
}

.text-muted {
  color: var(--color-text-muted);
}

.text-large {
  font-size: 1.25rem;
  line-height: 1.6;
}

/* Layout Components */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.container-narrow {
  max-width: var(--max-width-narrow);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.section {
  padding: var(--space-xl) 0;
}

.section-lg {
  padding: calc(var(--space-xl) * 1.5) 0;
}

/* Navigation */
.nav {
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-sm) 0;
  z-index: 1000;
}

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

.nav-logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text);
  text-decoration: none;
  letter-spacing: -0.01em;
}

.nav-links {
  display: flex;
  gap: var(--space-md);
  list-style: none;
  align-items: center;
}

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

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

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.875rem 1.75rem;
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  border-radius: 6px;
  transition: all 0.2s;
  border: none;
  cursor: pointer;
  font-family: var(--font-sans);
}

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

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

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

.btn-secondary:hover {
  border-color: var(--color-text);
}

/* Hero Section */
.hero {
  padding: var(--space-xl) 0;
  background: linear-gradient(to bottom, var(--color-bg), var(--color-bg-alt));
}

.hero h1 {
  max-width: 900px;
  margin-bottom: var(--space-md);
}

.hero p {
  font-size: 1.25rem;
  color: var(--color-text-muted);
  max-width: 700px;
  margin-bottom: var(--space-md);
  line-height: 1.6;
}

.hero-cta {
  display: flex;
  gap: var(--space-sm);
  margin-top: var(--space-md);
}

/* Grid Layouts */
.grid {
  display: grid;
  gap: var(--space-md);
}

.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.grid-2 {
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
}

/* Cards */
.card {
  padding: var(--space-md);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 8px;
}

.card h3 {
  margin-bottom: var(--space-sm);
}

.card p {
  color: var(--color-text-muted);
  margin-bottom: 0;
}

/* Feature Cards with Icons */
.feature-card {
  padding: var(--space-md);
}

.feature-icon {
  width: 48px;
  height: 48px;
  background: var(--color-accent);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-sm);
  font-size: 24px;
  color: white;
}

.feature-card h3 {
  margin-bottom: var(--space-xs);
}

/* Comparison / vs. Section */
.comparison {
  background: var(--color-bg-alt);
  padding: var(--space-md);
  border-radius: 8px;
  margin: var(--space-md) 0;
}

.comparison-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
  margin-top: var(--space-md);
}

.comparison-col h4 {
  margin-bottom: var(--space-sm);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.comparison-col ul {
  list-style: none;
  padding: 0;
}

.comparison-col li {
  padding: var(--space-xs) 0;
  display: flex;
  align-items: flex-start;
  gap: var(--space-xs);
  line-height: 1.6;
}

.comparison-col li::before {
  content: "•";
  color: var(--color-text-muted);
  font-weight: bold;
  flex-shrink: 0;
}

/* Testimonials / Social Proof */
.testimonial {
  background: var(--color-bg);
  border-left: 4px solid var(--color-accent);
  padding: var(--space-md);
  margin: var(--space-md) 0;
}

.testimonial-quote {
  font-size: 1.125rem;
  line-height: 1.6;
  margin-bottom: var(--space-sm);
  font-style: italic;
}

.testimonial-author {
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

/* Pricing Table */
.pricing-card {
  border: 2px solid var(--color-border);
  border-radius: 8px;
  padding: var(--space-md);
  text-align: left;
}

.pricing-card.featured {
  border-color: var(--color-accent);
  position: relative;
}

.pricing-card.featured::before {
  content: "Recommended";
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-accent);
  color: white;
  padding: 4px 12px;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.pricing-title {
  font-size: 1.5rem;
  margin-bottom: var(--space-xs);
}

.pricing-price {
  font-size: 2.5rem;
  font-weight: 700;
  margin: var(--space-sm) 0;
}

.pricing-price span {
  font-size: 1rem;
  font-weight: 400;
  color: var(--color-text-muted);
}

.pricing-features {
  list-style: none;
  margin: var(--space-md) 0;
}

.pricing-features li {
  padding: var(--space-xs) 0;
  display: flex;
  align-items: flex-start;
  gap: var(--space-xs);
}

.pricing-features li::before {
  content: "✓";
  color: var(--color-success);
  font-weight: bold;
  flex-shrink: 0;
}

/* Footer */
.footer {
  background: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
  padding: var(--space-lg) 0 var(--space-md);
  margin-top: var(--space-xl);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-lg);
  margin-bottom: var(--space-md);
}

.footer-section h4 {
  margin-bottom: var(--space-sm);
  font-size: 1rem;
}

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

.footer-section ul li {
  margin-bottom: var(--space-xs);
}

.footer-section a {
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color 0.2s;
}

.footer-section a:hover {
  color: var(--color-accent);
}

.footer-bottom {
  border-top: 1px solid var(--color-border);
  padding-top: var(--space-md);
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

/* Utility Classes */
.text-center {
  text-align: center;
}

.mt-0 { margin-top: 0; }
.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }

.mb-0 { margin-bottom: 0; }
.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }

/* Responsive */
@media (max-width: 768px) {
  html {
    font-size: 14px;
  }

  h1 {
    font-size: 2.25rem;
  }

  h2 {
    font-size: 1.75rem;
  }

  .hero-cta {
    flex-direction: column;
  }

  .btn {
    display: block;
    text-align: center;
  }

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

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

  .grid-2,
  .grid-3 {
    grid-template-columns: 1fr;
  }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Focus states for keyboard navigation */
a:focus,
button:focus,
.btn:focus {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}