/* ML Meanders - Main Styles */
/* Following curiosity wherever it leads */

/* ============================================
   CSS Custom Properties (Design Tokens)
   ============================================ */
:root {
  /* Colors - Light Theme */
  --color-bg: #fafaf8;
  --color-bg-subtle: #f5f5f3;
  --color-text: #2d2d2d;
  --color-text-muted: #6b6b6b;
  --color-text-faint: #999999;
  --color-accent: #4a7c72;
  --color-accent-hover: #3d6860;
  --color-link: #4a7c72;
  --color-link-hover: #3d6860;
  --color-border: #e5e5e3;
  --color-border-subtle: #ececea;

  /* Surfaces */
  --color-surface: #ffffff;
  --color-surface-raised: #ffffff;

  /* Code */
  --color-code-bg: #f8f8f6;
  --color-code-text: #2d2d2d;
  --color-code-border: #e5e5e3;

  /* Spacing Scale */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;

  /* Typography Scale */
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1.0625rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  --font-size-5xl: 3rem;

  /* Line Heights */
  --line-height-tight: 1.25;
  --line-height-snug: 1.4;
  --line-height-normal: 1.75;
  --line-height-relaxed: 1.85;

  /* Font Families */
  --font-serif: 'Source Serif 4', Georgia, 'Times New Roman', serif;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;

  /* Font Weights */
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;

  /* Borders */
  --radius-sm: 3px;
  --radius-md: 6px;
  --radius-lg: 8px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
  --transition-slow: 300ms ease;

  /* Z-index scale */
  --z-below: -1;
  --z-normal: 1;
  --z-above: 10;
  --z-sticky: 100;
  --z-modal: 1000;
  --z-tooltip: 1100;
}

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

* {
  margin: 0;
  padding: 0;
}

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
  overflow-x: hidden;
}

body {
  font-family: var(--font-serif);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--color-text);
  background-color: var(--color-bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Subtle paper texture */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
  opacity: 0.015;
  pointer-events: none;
  z-index: var(--z-below);
}

/* ============================================
   Links
   ============================================ */
a {
  color: var(--color-link);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

/* Content links with underline */
.post-body a,
.page-content a {
  text-decoration: underline;
  text-decoration-color: var(--color-border);
  text-underline-offset: 3px;
  transition: text-decoration-color var(--transition-fast), color var(--transition-fast);
}

.post-body a:hover,
.page-content a:hover {
  text-decoration-color: var(--color-link-hover);
}

/* ============================================
   Main Content Layout
   ============================================ */
.main-content {
  flex: 1;
  padding: var(--space-3xl) var(--space-md);
}

/* ============================================
   Selection
   ============================================ */
::selection {
  background-color: var(--color-accent);
  color: white;
}

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

/* ============================================
   Scrollbar (subtle)
   ============================================ */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background-color: var(--color-border);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background-color: var(--color-text-muted);
}

/* Firefox */
* {
  scrollbar-width: thin;
  scrollbar-color: var(--color-border) transparent;
}

/* ============================================
   Utility Classes
   ============================================ */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}