/* ============================================
   BASE.CSS
   Shared foundations across all pages
   ============================================ */

/* --------------------------------------------
   Theme Variables
   -------------------------------------------- */
:root {
  /* Light mode (default) */
  --bg: #f5f4f0;
  --bg-secondary: #eeedea;
  --ink: #1a1a18;
  --muted: rgba(26, 26, 24, 0.55);
  --faint: rgba(26, 26, 24, 0.25);
  --hair: rgba(26, 26, 24, 0.08);
  
  /* Surfaces */
  --surface: #fffef9;
  --surface-border: rgba(26, 26, 24, 0.06);
  --surface-shadow: 
    0 1px 1px rgba(0,0,0,0.02),
    0 2px 4px rgba(0,0,0,0.02),
    0 4px 8px rgba(0,0,0,0.02),
    0 8px 16px rgba(0,0,0,0.03);
  
  /* UI */
  --panel: rgba(255, 255, 255, 0.7);
  --panel-solid: #faf9f6;
  --accent: #3d6a5c;
  --accent-hover: #325848;
  --accent-glow: rgba(61, 106, 92, 0.15);
  
  /* Type */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  --font-serif: Georgia, "Times New Roman", serif;
  --font-mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, monospace;
  
  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 40px;
  --space-2xl: 64px;
  
  /* Layout */
  --max-width: 680px;
  --max-width-wide: 900px;
  
  /* Motion */
  --ease-out: cubic-bezier(0.23, 1, 0.32, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
}

[data-theme="dark"] {
  --bg: #111110;
  --bg-secondary: #1a1a18;
  --ink: rgba(255, 255, 255, 0.9);
  --muted: rgba(255, 255, 255, 0.5);
  --faint: rgba(255, 255, 255, 0.2);
  --hair: rgba(255, 255, 255, 0.08);
  
  --surface: #1c1c1a;
  --surface-border: rgba(255, 255, 255, 0.06);
  --surface-shadow: 
    0 1px 1px rgba(0,0,0,0.1),
    0 4px 8px rgba(0,0,0,0.15),
    0 8px 16px rgba(0,0,0,0.15);
  
  --panel: rgba(28, 28, 26, 0.8);
  --panel-solid: #1c1c1a;
  --accent: #7eb5a6;
  --accent-hover: #9dcabd;
  --accent-glow: rgba(126, 181, 166, 0.12);
}

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

html {
  font-size: 17px;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  background-color: var(--bg);
  color: var(--ink);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Subtle grain texture */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
  opacity: 0.025;
  pointer-events: none;
  z-index: 1000;
}

/* --------------------------------------------
   Typography
   -------------------------------------------- */
h1, h2, h3, h4 {
  margin: 0;
  font-weight: 500;
  line-height: 1.3;
  letter-spacing: -0.01em;
}

h1 {
  font-size: 1.75rem;
  margin-bottom: var(--space-lg);
}

h2 {
  font-size: 1.25rem;
  margin-top: var(--space-xl);
  margin-bottom: var(--space-md);
}

h3 {
  font-size: 1rem;
  margin-bottom: var(--space-sm);
}

p {
  margin: 0 0 var(--space-md) 0;
}

a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
  transition: color 0.15s ease;
}

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

ul, ol {
  margin: 0 0 var(--space-md) 0;
  padding-left: 1.25em;
}

li {
  margin-bottom: var(--space-sm);
}

strong {
  font-weight: 500;
}

.muted {
  color: var(--muted);
}

.faint {
  color: var(--faint);
}

/* --------------------------------------------
   Layout Components
   -------------------------------------------- */
.page-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-xl) var(--space-lg);
  min-height: 100vh;
}

.page-container.wide {
  max-width: var(--max-width-wide);
}

.section {
  margin-top: var(--space-xl);
  padding-top: var(--space-xl);
  border-top: 1px solid var(--hair);
}

.section:first-of-type {
  margin-top: 0;
  padding-top: 0;
  border-top: none;
}

/* --------------------------------------------
   Page Header (for content pages)
   -------------------------------------------- */
.page-header {
  position: sticky;
  top: 0;
  background: var(--bg);
  padding: var(--space-md) 0;
  margin: calc(-1 * var(--space-xl)) calc(-1 * var(--space-lg)) var(--space-xl);
  padding: var(--space-md) var(--space-lg);
  border-bottom: 1px solid var(--hair);
  z-index: 50;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.page-header-left {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.back-link {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: 0.875rem;
  color: var(--muted);
  text-decoration: none;
}

.back-link:hover {
  color: var(--ink);
}

.back-link svg {
  width: 16px;
  height: 16px;
}

.page-title {
  font-size: 0.875rem;
  font-weight: 500;
}

.page-header-right {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

/* Search trigger (shared) */
.search-trigger {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  background: var(--panel);
  border: 1px solid var(--hair);
  border-radius: 8px;
  font-size: 12px;
  color: var(--muted);
  cursor: pointer;
  transition: all 0.15s ease;
}

.search-trigger:hover {
  background: var(--panel-solid);
  color: var(--ink);
}

.search-trigger kbd {
  font-family: var(--font-sans);
  font-size: 10px;
  padding: 2px 5px;
  background: var(--hair);
  border-radius: 4px;
}

/* Theme toggle (shared) */
.theme-toggle {
  display: flex;
  padding: 3px;
  background: var(--panel);
  border: 1px solid var(--hair);
  border-radius: 8px;
}

.theme-toggle button {
  padding: 5px 8px;
  border: none;
  background: transparent;
  font-size: 11px;
  color: var(--muted);
  cursor: pointer;
  border-radius: 5px;
  transition: all 0.15s ease;
}

.theme-toggle button[data-active="true"] {
  background: var(--panel-solid);
  color: var(--ink);
}

/* --------------------------------------------
   Cards
   -------------------------------------------- */
.card {
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: 12px;
  padding: var(--space-lg);
  box-shadow: var(--surface-shadow);
  transition: all 0.2s var(--ease-out);
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 
    0 2px 4px rgba(0,0,0,0.02),
    0 4px 8px rgba(0,0,0,0.03),
    0 8px 16px rgba(0,0,0,0.04),
    0 16px 32px rgba(0,0,0,0.04);
}

.card-link {
  display: block;
  text-decoration: none;
  color: inherit;
}

.card-title {
  font-size: 1rem;
  font-weight: 500;
  margin-bottom: var(--space-xs);
  color: var(--ink);
}

.card-body {
  font-size: 0.9375rem;
  color: var(--muted);
  margin-bottom: var(--space-sm);
}

.card-meta {
  font-size: 0.8125rem;
  color: var(--faint);
}

/* Card grid */
.card-grid {
  display: grid;
  gap: var(--space-md);
}

@media (min-width: 600px) {
  .card-grid.cols-2 {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* --------------------------------------------
   Tags
   -------------------------------------------- */
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.tag {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  padding: 4px 10px;
  background: var(--bg-secondary);
  border-radius: 4px;
  color: var(--muted);
  cursor: pointer;
  transition: all 0.15s ease;
  border: none;
}

.tag:hover,
.tag.active {
  background: var(--accent-glow);
  color: var(--accent);
}

/* --------------------------------------------
   Forms
   -------------------------------------------- */
input[type="text"],
input[type="email"],
textarea {
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  font-family: var(--font-sans);
  font-size: 1rem;
  background: var(--surface);
  border: 1px solid var(--hair);
  border-radius: 8px;
  color: var(--ink);
  transition: border-color 0.15s ease;
}

input[type="text"]:focus,
input[type="email"]:focus,
textarea:focus {
  outline: none;
  border-color: var(--accent);
}

input::placeholder,
textarea::placeholder {
  color: var(--faint);
}

/* --------------------------------------------
   Page Footer
   -------------------------------------------- */
.page-footer {
  margin-top: var(--space-2xl);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--hair);
  font-size: 0.8125rem;
  color: var(--faint);
}

.page-footer a {
  color: var(--faint);
}

.page-footer a:hover {
  color: var(--muted);
}

/* --------------------------------------------
   Responsive
   -------------------------------------------- */
@media (max-width: 600px) {
  html {
    font-size: 16px;
  }
  
  .page-container {
    padding: var(--space-lg) var(--space-md);
  }
  
  .page-header {
    margin: calc(-1 * var(--space-lg)) calc(-1 * var(--space-md)) var(--space-lg);
    padding: var(--space-sm) var(--space-md);
  }
  
  h1 {
    font-size: 1.5rem;
  }
}

/* --------------------------------------------
   Print Styles
   -------------------------------------------- */
@media print {
  body {
    background: white;
    color: black;
    font-size: 12pt;
  }
  
  body::before {
    display: none;
  }
  
  .page-header,
  .theme-toggle,
  .search-trigger,
  .search-overlay,
  .back-link {
    display: none !important;
  }
  
  .page-container {
    max-width: 100%;
    padding: 0;
  }
  
  a {
    color: black;
    text-decoration: underline;
  }
  
  a[href]::after {
    content: " (" attr(href) ")";
    font-size: 0.8em;
    color: #666;
  }
  
  a[href^="/"]::after,
  a[href^="#"]::after {
    content: none;
  }
  
  .card,
  .availability,
  .contact-methods {
    box-shadow: none;
    border: 1px solid #ddd;
  }
  
  h1 {
    page-break-after: avoid;
  }
  
  h2, h3 {
    page-break-after: avoid;
  }
  
  ul, ol, img {
    page-break-inside: avoid;
  }
}

/* --------------------------------------------
   Additional Utilities
   -------------------------------------------- */
.guide-reading-time {
  font-size: 0.75rem;
  color: var(--faint);
  margin-left: var(--space-sm);
}

.guide-reading-time::before {
  content: "·";
  margin-right: var(--space-sm);
}

/* Images in guides and projects */
.guide-image,
.project-image {
  margin: var(--space-lg) 0;
}

.guide-image img,
.project-image img {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  border: 1px solid var(--hair);
}

.guide-image figcaption,
.project-image figcaption {
  font-size: 0.8125rem;
  color: var(--muted);
  margin-top: var(--space-sm);
  text-align: center;
}

.guide-images,
.project-images {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-md);
  margin: var(--space-md) 0 var(--space-lg) 0;
}

.guide-images .guide-image,
.project-images .project-image {
  margin: 0;
}

/* Project description from rich editor */
.project-description {
  margin: var(--space-md) 0;
  line-height: 1.6;
}

.project-description p {
  margin-bottom: 1em;
}

.project-description h2,
.project-description h3 {
  margin-top: 1.5em;
  margin-bottom: 0.5em;
}

/* Keyboard shortcut hints */
.keyboard-hint {
  font-size: 0.6875rem;
  color: var(--faint);
  margin-left: var(--space-xs);
}

.keyboard-hint kbd {
  font-family: var(--font-mono);
  padding: 1px 4px;
  background: var(--hair);
  border-radius: 3px;
}