/* ==========================================================================
   Clibbits - Landing Page Stylesheet
   Warm paper/ink aesthetic inspired by sketchpad design.
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS Variables
   -------------------------------------------------------------------------- */
:root {
  --color-bg: #faf9f7;
  --color-bg-alt: #f5f4f2;
  --color-text: #1a1a1a;
  --color-text-muted: #6b6b6b;
  --color-accent: #4a7c23;
  --color-border: #e0e0e0;
  --color-dots: #d4d4d4;

  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 3rem;
  --space-xl: 5rem;

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

  --max-width: 1300px;
  --border-radius: 4px;
}

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
   -------------------------------------------------------------------------- */
*, *::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;
  overflow-x: hidden;
  max-width: 100vw;
}

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  overflow-x: hidden;
  max-width: 100vw;
}

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

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

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

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

.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);
  position: relative;
  z-index: 100;
}

.nav-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1150px;
  margin: 0 auto;
}

.nav-logo {
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.nav-links {
  display: flex;
  align-items: center;
  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);
}

.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-toggle-mobile {
  display: none;
}

.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;
}

/* --------------------------------------------------------------------------
   Hero
   -------------------------------------------------------------------------- */
.hero {
  padding: var(--space-xl) 0 var(--space-lg);
  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: 800px;
  margin: 0 auto var(--space-xs);
}

.hero-audience {
  font-size: 1rem;
  color: var(--color-text-muted);
  margin: 0 auto var(--space-lg);
}

/* Download CTA */
.download-cta {
  margin-top: var(--space-md);
}

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

.download-btn {
  display: inline-flex;
  align-items: stretch;
  border-radius: 8px;
  overflow: hidden;
  text-decoration: none;
  transition: opacity 0.15s ease;
  border: 1px solid var(--color-text);
}

.download-btn:hover {
  opacity: 0.85;
  color: inherit;
}

.download-label {
  display: flex;
  align-items: center;
  padding: 1rem 2rem;
  background: var(--color-text);
  color: var(--color-bg);
  font-size: 1.25rem;
  font-weight: 500;
  letter-spacing: -0.01em;
}

.download-btn-secondary .download-label {
  background: var(--color-bg);
  color: var(--color-text);
}

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

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

.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-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.75rem;
  justify-content: flex-end;
}

.offline-badge,
.online-badge {
  display: inline-block;
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  padding: 0.2rem 0.5rem;
  border-radius: 2rem;
  background: transparent;
  border: 1px solid var(--color-text-muted);
  color: var(--color-text-muted);
  width: fit-content;
}

.shortcut-badge {
  display: inline-block;
  font-size: 0.75rem;
  font-family: var(--font-mono);
  font-weight: 500;
  padding: 0.25rem 0.6rem;
  border-radius: 4px;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
}

/* Feature ASCII visual */
.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);
}

/* --------------------------------------------------------------------------
   Content Pages (Hot Links, Philosophy)
   -------------------------------------------------------------------------- */
.page-content {
  max-width: 700px;
  margin: 0 auto;
  padding: var(--space-xl) var(--space-md);
  min-height: calc(100vh - 200px);
}

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

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

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

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

.page-body {
  margin-top: var(--space-lg);
}

.page-signature {
  margin-top: var(--space-lg);
  font-style: italic;
  color: var(--color-text-muted);
}

/* Code block */
.page-content code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: 3px;
  padding: 0.15rem 0.4rem;
}

.page-content pre {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: var(--space-md);
  overflow-x: auto;
  margin-bottom: var(--space-md);
}

.page-content pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: 0.85rem;
  line-height: 1.6;
}

/* Example table */
.example-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: var(--space-md);
  font-size: 0.9rem;
}

.example-table th,
.example-table td {
  text-align: left;
  padding: var(--space-xs) var(--space-sm);
  border-bottom: 1px dotted var(--color-dots);
}

.example-table th {
  font-weight: 600;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
}

.example-table td code {
  font-size: 0.8rem;
}

/* --------------------------------------------------------------------------
   Buttons
   -------------------------------------------------------------------------- */
.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: #4a2c6a;
  color: #fff;
}

body.dark .btn-primary:hover {
  background: #9b6dca;
  color: #1a1a1a;
}

/* --------------------------------------------------------------------------
   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;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
  max-width: 1150px;
  margin: 0 auto;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
}

.footer-copyright {
  margin: 0;
}

.footer-brand {
  color: var(--color-text);
  font-weight: 500;
}

.footer-divider {
  margin: 0 0.5rem;
  color: var(--color-text-muted);
}

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

.footer-links a {
  color: var(--color-text-muted);
  transition: color 0.15s ease;
}

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

/* --------------------------------------------------------------------------
   Responsive
   -------------------------------------------------------------------------- */
@media (max-width: 768px) {
  .hero,
  .features {
    padding: var(--space-lg) 0;
  }

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

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

  .feature {
    grid-template-columns: 1fr;
    gap: var(--space-md);
    padding: var(--space-md) 0;
  }

  .feature.reversed {
    direction: ltr;
  }

  .dotted-line {
    margin: var(--space-md) 0;
  }

  .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;
    align-items: flex-end;
    padding: var(--space-md) var(--space-lg);
    gap: var(--space-xs);
  }

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

  .nav-inner {
    position: relative;
  }

  .nav-links li:has(.theme-toggle) {
    display: none;
  }

  .theme-toggle-mobile {
    display: block;
    margin-left: auto;
    margin-right: 0.35rem;
    padding: 0.5rem 0.6rem;
    font-size: 0.85rem;
  }

  .footer {
    padding: var(--space-md) 0;
    font-size: 0.8rem;
  }

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

  .footer-links {
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-sm);
  }

  .feature-badges {
    flex-direction: column;
    align-items: flex-start;
  }

  .feature-visual {
    font-size: 0.55rem;
    padding: var(--space-sm);
  }

  .example-table {
    font-size: 0.8rem;
  }

  .example-table th,
  .example-table td {
    padding: var(--space-xs) 0.5rem;
  }
}

@media (max-width: 400px) {
  .feature-visual {
    font-size: 0.45rem;
  }
}