/* ==========================================================================
   Field Theory - Main Stylesheet
   A sketchpad-inspired design with warm paper/ink colors.
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS Variables - Our color palette and spacing system
   -------------------------------------------------------------------------- */
:root {
  /* Colors - warm paper and ink aesthetic (light mode) */
  --color-bg: #faf9f7;
  --color-bg-alt: #f5f4f2;
  --color-text: #1a1a1a;
  --color-text-muted: #6b6b6b;
  --color-accent: #4a7c23;
  --color-border: #e0e0e0;
  --color-dots: #d4d4d4;

  /* Spacing scale */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 3rem;
  --space-xl: 5rem;

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'SF Mono', Monaco, 'Cascadia Code', monospace;

  /* Layout */
  --max-width: 1100px;
  --border-radius: 4px;
}

/* Dark mode - medium dark, not too harsh */
body.dark {
  --color-bg: #1e1e1e;
  --color-bg-alt: #2a2a2a;
  --color-text: #e8e8e8;
  --color-text-muted: #999999;
  --color-accent: #7cb342;
  --color-border: #3a3a3a;
  --color-dots: #4a4a4a;
}

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

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

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
}

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

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

img {
  max-width: 100%;
  height: auto;
}

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

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

/* Dotted separator - the sketchpad nod */
.dotted-line {
  border: none;
  border-top: 2px dotted var(--color-dots);
  margin: var(--space-lg) 0;
  width: 100%;
  display: block;
}

/* --------------------------------------------------------------------------
   Navigation
   -------------------------------------------------------------------------- */
.nav {
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--color-border);
}

.nav-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.nav-logo-img {
  height: 30px;
  max-height: 30px;
  width: auto;
}

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

.nav-links a {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  transition: color 0.15s ease;
}

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

/* Dark mode toggle button */
.theme-toggle {
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: 0.4rem 0.6rem;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  cursor: pointer;
  transition: all 0.15s ease;
}

.theme-toggle:hover {
  border-color: var(--color-text);
  color: var(--color-text);
}

/* Theme label hidden on desktop, shown on mobile */
.theme-label {
  display: none;
}

/* Mobile download button text */
.mobile-download-text {
  display: none;
}
.desktop-download-text {
  display: inline;
}

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

.hero h1 {
  font-size: 2.5rem;
  font-weight: 600;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-sm);
  line-height: 1.2;
}

.hero-tagline {
  font-size: 1.2rem;
  color: var(--color-text-muted);
  max-width: 600px;
  margin: 0 auto var(--space-lg);
}

/* ASCII art visual box */
.hero-visual {
  background: var(--color-bg-alt);
  border: 1px dashed var(--color-border);
  border-radius: var(--border-radius);
  padding: var(--space-lg);
  margin: 0 auto var(--space-lg);
  max-width: 700px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.4;
  color: var(--color-text-muted);
  text-align: left;
  white-space: pre;
  overflow-x: auto;
}

/* CTA Buttons */
.hero-buttons {
  display: flex;
  gap: var(--space-sm);
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border-radius: var(--border-radius);
  font-size: 0.95rem;
  font-weight: 500;
  transition: all 0.15s ease;
  cursor: pointer;
  border: none;
}

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

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

.btn-secondary {
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

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

/* --------------------------------------------------------------------------
   Feature Sections
   -------------------------------------------------------------------------- */
.features {
  padding: var(--space-lg) 0;
}

.feature {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
  align-items: center;
  padding: var(--space-lg) 0;
}

.feature.reversed {
  direction: rtl;
}

.feature.reversed > * {
  direction: ltr;
}

.feature-content h2 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: var(--space-xs);
  letter-spacing: -0.02em;
}

.feature-problem {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-sm);
  font-style: italic;
}

.feature-description {
  font-size: 1rem;
  line-height: 1.7;
}

/* ASCII visual for features */
.feature-visual {
  background: var(--color-bg-alt);
  border: 1px dotted var(--color-dots);
  border-radius: var(--border-radius);
  padding: var(--space-md);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  line-height: 1.5;
  color: var(--color-text-muted);
  white-space: pre;
  overflow-x: auto;
}

.feature-visual .highlight {
  color: var(--color-accent);
}

/* --------------------------------------------------------------------------
   Pricing Section
   -------------------------------------------------------------------------- */
.pricing {
  padding: var(--space-xl) 0;
}

.pricing h2 {
  text-align: center;
  font-size: 2rem;
  margin-bottom: var(--space-lg);
}

.pricing-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
  max-width: 800px;
  margin: 0 auto;
}

.pricing-card {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: var(--space-lg);
}

.pricing-card.featured {
  border-color: var(--color-text);
}

.pricing-card h3 {
  font-size: 1.25rem;
  margin-bottom: var(--space-xs);
}

.pricing-card .price {
  font-size: 2rem;
  font-weight: 600;
  margin-bottom: var(--space-md);
}

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

.pricing-card ul {
  list-style: none;
  margin-bottom: var(--space-md);
}

.pricing-card li {
  padding: var(--space-xs) 0;
  border-bottom: 1px dotted var(--color-dots);
  font-size: 0.95rem;
}

.pricing-card li:last-child {
  border-bottom: none;
}

/* Pricing description text below heading */
.pricing-description {
  text-align: center;
  color: var(--color-text-muted);
  margin-bottom: var(--space-lg);
}

/* Full-width buttons in pricing cards */
.pricing-card .btn {
  width: 100%;
  text-align: center;
  margin-top: var(--space-md);
}

/* Note below pricing card (e.g., "Quantities reset monthly") */
.pricing-card-note {
  margin-top: var(--space-md);
  margin-bottom: 0;
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

/* Feature notes (asterisks and daggers) */
.feature-note {
  font-size: 0.75em;
  vertical-align: super;
  color: var(--color-text-muted);
  margin-right: 0.2em;
  font-style: italic;
}

/* Pricing footnotes */
.pricing-footnotes {
  max-width: 800px;
  margin: var(--space-md) auto 0;
  padding-top: var(--space-md);
  font-size: 0.9rem;
  color: var(--color-text-muted);
  text-align: center;
}

.pricing-footnotes p {
  margin-bottom: var(--space-xs);
}

.pricing-footnotes p:last-child {
  margin-bottom: 0;
}

/* FAQ Section */
.faq-container {
  max-width: 700px;
  margin: 0 auto;
}

.faq-title {
  text-align: center;
  margin-bottom: 2rem;
}

.faq-item {
  margin-bottom: 2rem;
}

.faq-question {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

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

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
.footer {
  padding: var(--space-lg) 0;
  border-top: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

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

/* --------------------------------------------------------------------------
   Page-Specific Styles
   -------------------------------------------------------------------------- */

/* Download page */
.download-hero {
  text-align: center;
  padding: var(--space-xl) 0;
}

.download-options {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
  max-width: 600px;
  margin: var(--space-lg) auto;
  justify-content: center;
}

.download-card {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: var(--space-lg);
  text-align: center;
}

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

.download-card .requirements {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-top: var(--space-sm);
}

.download-card .feature-visual {
  margin-bottom: var(--space-sm);
}

/* Theory page */
.theory-content {
  max-width: 700px;
  margin: 0 auto;
  padding: var(--space-xl) var(--space-md);
}

.theory-content h1 {
  font-size: 2rem;
  margin-bottom: var(--space-lg);
}

.theory-content h2 {
  font-size: 1.3rem;
  margin-top: var(--space-lg);
  margin-bottom: var(--space-sm);
}

.theory-content p {
  margin-bottom: var(--space-md);
  line-height: 1.8;
}

.theory-content .cta {
  text-align: center;
  margin-top: var(--space-lg);
}

/* --------------------------------------------------------------------------
   Responsive Styles
   -------------------------------------------------------------------------- */

/* Prevent horizontal scrolling on all devices */
html, body {
  overflow-x: hidden;
  max-width: 100vw;
}

/* Hamburger menu for mobile */
.nav-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: 0.5rem;
  cursor: pointer;
  color: var(--color-text);
}

.nav-toggle svg {
  display: block;
  width: 20px;
  height: 20px;
  stroke: currentColor;
}

@media (max-width: 768px) {
  /* Reduce section spacing on mobile */
  .hero,
  .pricing,
  .download-hero {
    padding: var(--space-lg) 0;
  }
  
  .features {
    padding: var(--space-md) 0;
  }
  
  .feature {
    padding: var(--space-md) 0;
  }
  
  .dotted-line {
    margin: var(--space-md) 0;
  }

  .hero h1 {
    font-size: 2rem;
  }

  .feature {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

  .feature.reversed {
    direction: ltr;
  }

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

  .download-options {
    grid-template-columns: 1fr;
  }

  .footer-inner {
    flex-direction: column;
    gap: var(--space-sm);
    text-align: center;
  }

  /* Hamburger menu visible on mobile */
  .nav-toggle {
    display: block;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    padding: var(--space-md);
    gap: var(--space-xs);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-inner {
    position: relative;
  }

  .nav-links li {
    text-align: left;
  }
  
  /* Theme toggle with label on mobile */
  .theme-toggle-wrapper {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
  }
  
  .theme-label {
    display: inline;
    font-size: 0.9rem;
    color: var(--color-text-muted);
  }
  
  /* Mobile: show "Visit on Mac" instead of "Download for Mac" */
  .mobile-download-text {
    display: inline;
  }
  .desktop-download-text {
    display: none;
  }

  /* Scale down ASCII art visuals to fit mobile screens. */
  .hero-visual,
  .feature-visual {
    font-size: 0.55rem;
    padding: var(--space-sm);
  }

  .hero-visual {
    max-width: 100%;
  }
}

/* Extra small screens need even smaller ASCII art. */
@media (max-width: 400px) {
  .hero-visual,
  .feature-visual {
    font-size: 0.45rem;
  }

  .nav-logo-img {
    height: 24px;
    max-height: 24px;
  }
}