/* Proof of Capture - Whitepaper Redesign */
/* Inspired by: logos.co, nof1.ai, whitepaper.mx */

:root {
  /* Color System - Clean & Professional */
  --color-bg: #ffffff;
  --color-text-primary: #0a0a0a;
  --color-text-secondary: #525252;
  --color-text-muted: #a3a3a3;
  --color-border: #e5e5e5;
  --color-accent: #0066ff;
  --color-accent-hover: #0052cc;
  --color-surface: #fafafa;
  
  /* Typography - Clear Hierarchy */
  --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
  --font-display: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
  
  /* Spacing Scale - Generous Whitespace */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2.5rem;
  --space-xl: 4rem;
  --space-2xl: 6rem;
  --space-3xl: 8rem;
  
  /* Layout */
  --max-width: 800px;
  --max-width-wide: 1200px;
  
  /* Transitions */
  --transition: 150ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background: var(--color-bg);
  color: var(--color-text-primary);
  font-family: var(--font-primary);
  line-height: 1.6;
  min-height: 100vh;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--color-text-primary);
}

h1 {
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 700;
  margin-bottom: var(--space-md);
}

h2 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  margin-bottom: var(--space-md);
  margin-top: var(--space-2xl);
}

h3 {
  font-size: clamp(1.25rem, 3vw, 1.75rem);
  margin-bottom: var(--space-sm);
  margin-top: var(--space-lg);
}

h4 {
  font-size: 1.125rem;
  margin-bottom: var(--space-sm);
  font-weight: 600;
}

p {
  font-size: 1.0625rem;
  line-height: 1.7;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
  max-width: 65ch;
}

strong {
  font-weight: 600;
  color: var(--color-text-primary);
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition);
}

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

/* Header/Navigation */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
}

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

.logo {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-text-primary);
  letter-spacing: -0.01em;
}

.nav-links {
  display: flex;
  gap: var(--space-lg);
  list-style: none;
}

.nav-links a {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  font-weight: 500;
}

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

/* Container */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

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

/* Sections */
.section {
  padding: var(--space-3xl) 0;
}

.section:first-of-type {
  padding-top: var(--space-2xl);
}

.section-header {
  margin-bottom: var(--space-xl);
  text-align: center;
}

.section-title {
  margin-bottom: var(--space-sm);
}

.section-description {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  max-width: 60ch;
  margin: 0 auto var(--space-md);
}

/* Hero Section */
.hero {
  padding: var(--space-3xl) 0;
  text-align: center;
}

.hero-title {
  max-width: 20ch;
  margin: 0 auto var(--space-md);
}

.hero-description {
  font-size: 1.1875rem;
  line-height: 1.6;
  color: var(--color-text-secondary);
  max-width: 55ch;
  margin: 0 auto var(--space-xl);
}

.hero-meta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-xl);
}

/* Cards & Content Blocks */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: var(--space-lg);
  margin-bottom: var(--space-md);
  transition: border-color var(--transition);
}

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

.card-title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: var(--space-sm);
  color: var(--color-text-primary);
}

.card-content {
  font-size: 1rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* Grid Layouts */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
  margin-bottom: var(--space-lg);
}

@media (min-width: 768px) {
  .grid-2 {
    grid-template-columns: repeat(2, 1fr);
  }
}

.grid-3 {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

@media (min-width: 768px) {
  .grid-3 {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* Comparison Table */
.comparison-table {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
  margin: var(--space-xl) 0;
}

@media (min-width: 768px) {
  .comparison-table {
    grid-template-columns: repeat(3, 1fr);
  }
}

.comparison-col {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: var(--space-lg);
}

.comparison-col h3 {
  font-size: 1.125rem;
  margin-top: 0;
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-sm);
  border-bottom: 2px solid var(--color-border);
}

.comparison-row {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  padding: var(--space-sm) 0;
  border-bottom: 1px solid var(--color-border);
}

.comparison-row:last-child {
  border-bottom: none;
}

.row-label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text-primary);
}

.row-value {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

.highlight-col {
  background: var(--color-bg);
  border: 2px solid var(--color-text-primary);
}

/* Process Steps */
.steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
  margin: var(--space-xl) 0;
}

@media (min-width: 768px) {
  .steps {
    grid-template-columns: repeat(2, 1fr);
  }
}

.step {
  position: relative;
  padding-left: var(--space-xl);
}

.step-number {
  position: absolute;
  left: 0;
  top: 0;
  width: 2rem;
  height: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-text-primary);
  color: var(--color-bg);
  border-radius: 50%;
  font-size: 0.875rem;
  font-weight: 600;
}

.step-title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: var(--space-sm);
  color: var(--color-text-primary);
}

.step-content {
  font-size: 1rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* Buttons/CTAs */
.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  font-size: 0.9375rem;
  font-weight: 500;
  text-align: center;
  border-radius: 6px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
}

.btn-primary {
  background: var(--color-text-primary);
  color: var(--color-bg);
  border-color: var(--color-text-primary);
}

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

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

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

.cta-buttons {
  display: flex;
  gap: var(--space-sm);
  justify-content: center;
  flex-wrap: wrap;
  margin-top: var(--space-xl);
}

/* Divider */
.divider {
  height: 1px;
  background: var(--color-border);
  margin: var(--space-3xl) 0;
}

/* Footer */
.footer {
  border-top: 1px solid var(--color-border);
  padding: var(--space-xl) 0;
  margin-top: var(--space-3xl);
}

.footer-content {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
  text-align: center;
}

.footer p {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-sm);
  max-width: 100%;
}

/* Metric Display */
.metric {
  text-align: center;
  padding: var(--space-lg);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  margin: var(--space-md) 0;
}

.metric-value {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--space-xs);
}

.metric-label {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* List Styles */
ul, ol {
  margin-left: var(--space-lg);
  margin-bottom: var(--space-md);
  color: var(--color-text-secondary);
}

li {
  margin-bottom: var(--space-xs);
  line-height: 1.7;
}

/* Responsive */
@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  
  .section {
    padding: var(--space-2xl) 0;
  }
  
  .hero {
    padding: var(--space-2xl) 0;
  }
}

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

/* Focus States */
*:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* Print Styles */
@media print {
  .header,
  .nav,
  .cta-buttons,
  .footer {
    display: none;
  }
  
  body {
    font-size: 12pt;
    line-height: 1.5;
  }
  
  h1 {
    font-size: 24pt;
  }
  
  h2 {
    font-size: 18pt;
    page-break-after: avoid;
  }
  
  h3 {
    font-size: 14pt;
    page-break-after: avoid;
  }
  
  .section {
    page-break-inside: avoid;
  }
}