/* ==========================================================================
   OpenFlight Labs - Museum Specimen Archive Theme
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS Custom Properties (Theme)
   -------------------------------------------------------------------------- */
:root {
  /* Color Palette - Museum Specimen Archive */
  --color-background: #F5F1E8;
  --color-text: #2C2416;
  --color-text-muted: #5C5040;
  --color-text-light: #8B7E6A;
  --color-accent: #6B8E6B;
  --color-accent-dark: #4A6B4A;
  --color-highlight: #C17F59;
  --color-label-bg: #E8E4D9;
  --color-label-border: #C4B998;
  --color-border: #C4B998;
  --color-card-bg: #FFFBF2;
  --color-card-shadow: rgba(44, 36, 22, 0.1);
  --color-glass-slide: rgba(200, 195, 180, 0.3);

  /* Status Colors */
  --status-hypothesis: #7BA3C9;
  --status-in-progress: #D4A55A;
  --status-completed: #6B8E6B;
  --status-archived: #8B7E6A;

  /* Typography */
  --font-heading: 'Playfair Display', Georgia, serif;
  --font-body: 'Source Serif Pro', Georgia, serif;
  --font-label: 'Courier Prime', 'Courier New', monospace;
  --font-accent: 'Caveat', cursive;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;

  /* Layout */
  --max-width: 1200px;
  --content-width: 800px;
  --border-radius: 4px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-medium: 300ms ease;
}

/* --------------------------------------------------------------------------
   Reset & Base Styles
   -------------------------------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
}

* {
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-background);
  min-height: 100vh;
  /* Subtle paper texture */
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='4' height='4' viewBox='0 0 4 4'%3E%3Cpath fill='%23C4B998' fill-opacity='0.05' d='M1 3h1v1H1V3zm2-2h1v1H3V1z'%3E%3C/path%3E%3C/svg%3E");
}

/* --------------------------------------------------------------------------
   Typography
   -------------------------------------------------------------------------- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.3;
  margin-bottom: var(--space-md);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

p {
  margin-bottom: var(--space-md);
}

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

a:hover {
  color: var(--color-accent-dark);
  text-decoration: underline;
}

.handwritten {
  font-family: var(--font-accent);
  font-size: 1.25em;
}

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

.content {
  max-width: var(--content-width);
  margin: 0 auto;
}

/* --------------------------------------------------------------------------
   Navigation
   -------------------------------------------------------------------------- */
.nav {
  background-color: var(--color-label-bg);
  border-bottom: 2px solid var(--color-border);
  padding: var(--space-md) 0;
}

.nav__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.nav__brand {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text);
  text-decoration: none;
}

.nav__brand:hover {
  color: var(--color-accent);
  text-decoration: none;
}

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

.nav__link {
  font-family: var(--font-label);
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
  text-decoration: none;
  padding: var(--space-xs) 0;
  border-bottom: 2px solid transparent;
  transition: all var(--transition-fast);
}

.nav__link:hover,
.nav__link--active {
  color: var(--color-text);
  border-bottom-color: var(--color-accent);
  text-decoration: none;
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
.footer {
  margin-top: var(--space-3xl);
  padding: var(--space-xl) 0;
  background-color: var(--color-label-bg);
  border-top: 2px solid var(--color-border);
  font-family: var(--font-label);
  font-size: 0.85rem;
  color: var(--color-text-muted);
  text-align: center;
}

/* --------------------------------------------------------------------------
   Buttons
   -------------------------------------------------------------------------- */
.btn {
  display: inline-block;
  font-family: var(--font-label);
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: var(--space-sm) var(--space-lg);
  border: 2px solid var(--color-border);
  background-color: var(--color-card-bg);
  color: var(--color-text);
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn:hover {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
  color: white;
  text-decoration: none;
}

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

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

/* --------------------------------------------------------------------------
   Responsive
   -------------------------------------------------------------------------- */
@media (max-width: 768px) {
  h1 { font-size: 2rem; }
  h2 { font-size: 1.5rem; }
  h3 { font-size: 1.25rem; }

  .nav__inner {
    flex-direction: column;
    text-align: center;
  }

  .nav__links {
    flex-wrap: wrap;
    justify-content: center;
  }
}