/* AI Guide - Global Base Styles
 * High-performance, accessible, modern design system
 * WCAG AA compliant with semantic HTML support
 */

:root {
  /* Colors - WCAG AA compliant contrast ratios */
  --bg: #0b0f14;
  --panel: #10171f;
  --surface: #111a24;
  --text: #e6edf3;
  --muted: #9aa6b2;
  --accent: #6ea8fe;
  --accent-2: #a78bfa;
  --border: #1e2a36;
  --focus-ring: #6ea8fe;
  
  /* Spacing */
  --radius: 12px;
  --shadow: 0 12px 24px rgba(0, 0, 0, 0.25);
  
  /* Typography */
  --font: "Sansation", system-ui, -apple-system, "Segoe UI", Roboto, Ubuntu, Cantarell, "Noto Sans", Arial, sans-serif;
  --font-mono: Consolas, Monaco, "Andale Mono", "Ubuntu Mono", "Courier New", monospace;
}

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

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

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *:not(.variant-fire-gradient):not(.variant-fire-parallax):not(.variant-fire-intense):not(.variant-fire-particles):not(body.variant-fire-gradient):not(body.variant-fire-parallax):not(body.variant-fire-intense):not(body.variant-fire-particles):not(body.variant-fire-gradient *)::before:not(body.variant-fire-gradient *)::after:not(body.variant-fire-parallax *)::before:not(body.variant-fire-parallax *)::after, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  /* Allow animations for fire variants even with reduced motion preference */
  body.variant-fire-gradient,
  body.variant-fire-gradient *,
  body.variant-fire-parallax,
  body.variant-fire-parallax *,
  body.variant-fire-parallax::before,
  body.variant-fire-parallax::after,
  body.variant-fire-intense,
  body.variant-fire-intense *,
  body.variant-fire-particles,
  body.variant-fire-particles * {
    animation-duration: unset !important;
    animation-iteration-count: unset !important;
  }
}

body {
  margin: 0;
  padding: 0;
  color: var(--text);
  background: var(--bg);
  font-family: var(--font);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

/* Skip to main content link (accessibility) */
.skip-to-main {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--accent);
  color: var(--bg);
  padding: 8px 16px;
  text-decoration: none;
  font-weight: 700;
  z-index: 1000;
  border-radius: 0 0 4px 0;
}

.skip-to-main:focus {
  top: 0;
  outline: 3px solid var(--focus-ring);
  outline-offset: 2px;
}

/* Main Content Container */
.main-content {
  max-width: 900px;
  margin: 32px auto;
  padding: 24px;
}

@media (max-width: 900px) {
  .main-content {
    padding: 16px;
    margin: 16px auto;
  }
}

@media (max-width: 600px) {
  .main-content {
    padding: 12px;
    margin: 8px auto;
  }
}

/* Typography - Semantic Hierarchy */
h1, h2, h3, h4, h5, h6 {
  color: var(--text);
  margin: 1.2em 0 0.6em;
  line-height: 1.3;
  font-weight: 700;
}

h1 {
  font-size: 2.2rem;
  margin-top: 0;
}

h2 {
  font-size: 1.8rem;
}

h3 {
  font-size: 1.4rem;
}

h4 {
  font-size: 1.2rem;
}

@media (max-width: 900px) {
  h1 { font-size: 1.8rem; }
  h2 { font-size: 1.5rem; }
  h3 { font-size: 1.2rem; }
  h4 { font-size: 1.1rem; }
}

@media (max-width: 600px) {
  h1 { font-size: 1.5rem; }
  h2 { font-size: 1.3rem; }
  h3 { font-size: 1.1rem; }
  h4 { font-size: 1rem; }
  
  .site-logo {
    width: 40px;
    height: 40px;
  }
  
  .header-container {
    padding: 12px 16px;
    gap: 12px;
  }
}

/* Paragraphs & Text */
p {
  margin-bottom: 1em;
}

p.lead {
  color: var(--muted);
  font-size: 1.1rem;
  margin: 16px 0;
}

/* Links - WCAG AA compliant */
a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s ease, text-decoration 0.2s ease;
}

a:hover {
  text-decoration: underline;
  color: #8bb7ff;
}

a:focus {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
  border-radius: 2px;
}

a:focus:not(:focus-visible) {
  outline: none;
}

/* Lists */
ul, ol {
  padding-left: 2em;
  margin-bottom: 1em;
}

li {
  margin-bottom: 0.5em;
}

ul.linklist {
  padding-left: 0;
  margin: 8px 0 0;
  list-style: none;
}

ul.linklist li {
  padding: 10px 12px;
  border-radius: 8px;
  border: 1px solid transparent;
  position: relative;
  transition: background 0.2s, border-color 0.2s;
}

ul.linklist li:hover {
  background: var(--panel);
  border-color: var(--border);
}

ul.linklist li a {
  text-decoration: none;
  font-weight: 700;
  font-size: 1.1rem;
}

.desc {
  color: var(--muted);
  margin-top: 4px;
  font-size: 0.95rem;
}

.guide-meta {
  color: var(--muted);
  font-size: 0.85rem;
  margin-top: 4px;
}

/* Code */
code {
  background: var(--surface);
  color: var(--text);
  padding: 0.2em 0.4em;
  border-radius: 3px;
  font-size: 0.9em;
  font-family: var(--font-mono);
}

pre {
  background: var(--surface);
  padding: 16px;
  border-radius: var(--radius);
  overflow-x: auto;
  margin: 1em 0;
  border: 1px solid var(--border);
}

pre code {
  background: none;
  padding: 0;
  font-size: 0.9rem;
  line-height: 1.5;
}

/* Info Boxes */
.info-box {
  background: var(--surface);
  color: var(--text);
  padding: 16px 20px;
  margin: 20px 0;
  border-left: 4px solid var(--accent);
  border-radius: 4px;
  border: 1px solid var(--border);
}

.info-box p:first-child {
  margin-top: 0;
}

.info-box p:last-child {
  margin-bottom: 0;
}

/* Code Format Explanation Box */
.code-format-explanation {
  background: rgba(46, 139, 87, 0.1);
  color: var(--text);
  padding: 16px 20px;
  margin: 16px 0;
  border-left: 4px solid #2e8b57;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.9em;
}

/* Model Cards */
.model-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  margin-bottom: 16px;
  box-shadow: var(--shadow);
  transition: transform 0.12s ease, box-shadow 0.2s ease;
}

.model-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 30px rgba(0, 0, 0, 0.35);
}

.model-card h3, .model-card h4 {
  margin-top: 0;
}

.model-card-red {
  background: rgba(139, 0, 0, 0.1);
  border-color: #8b0000;
}

/* Buttons */
.btn, button {
  display: inline-block;
  padding: 10px 20px;
  border-radius: 8px;
  text-decoration: none;
  color: var(--bg);
  background: var(--accent);
  font-weight: 700;
  font-size: 0.95rem;
  border: none;
  cursor: pointer;
  transition: transform 0.1s ease, background 0.2s ease;
  font-family: var(--font);
}

.btn:hover, button:hover {
  transform: translateY(-1px);
  background: #8bb7ff;
  text-decoration: none;
}

.btn:focus, button:focus {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

.btn:active, button:active {
  transform: translateY(0);
}

.btn.primary {
  background: linear-gradient(90deg, #6ea8fe, #a78bfa);
  color: #0a0f18;
}

/* Navigation */
nav {
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  padding: 16px 24px;
}

nav ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

nav a {
  color: var(--text);
  text-decoration: none;
  padding: 4px 8px;
  border-radius: 4px;
  transition: background 0.2s;
}

nav a:hover {
  background: var(--surface);
  text-decoration: none;
}

nav a:focus {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

@media (max-width: 600px) {
  nav {
    padding: 12px 16px;
  }
  
  nav ul {
    gap: 12px;
  }
}

.nav-container {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 0;
  margin-bottom: 20px;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}

.nav-button, .nav-link {
  padding: 8px 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  text-decoration: none;
  color: var(--text);
  font-weight: 600;
  transition: all 0.2s ease;
}

.nav-button:hover, .nav-link:hover {
  background: var(--panel);
  border-color: var(--accent);
  text-decoration: none;
}

/* Header */
header {
  background: var(--panel);
  border-bottom: 1px solid var(--border);
}

.header-container {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 24px;
  flex-wrap: wrap;
}

.site-logo-link {
  flex-shrink: 0;
  line-height: 0;
  border-radius: 8px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.site-logo-link:hover {
  transform: scale(1.05);
  opacity: 0.9;
  text-decoration: none;
}

.site-logo-link:focus {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

.site-logo {
  width: 48px;
  height: 48px;
  display: block;
  border-radius: 8px;
}

.brand {
  display: flex;
  gap: 10px;
  align-items: baseline;
  flex-wrap: wrap;
}

.tag {
  color: var(--muted);
  font-size: 0.98rem;
}

/* RSS Feed Link */
.rss-link {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.9rem;
  transition: all 0.2s ease;
  margin-left: auto;
}

.rss-link:hover {
  background: var(--panel);
  border-color: var(--accent);
  transform: translateY(-1px);
  text-decoration: none;
}

.rss-link:focus {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

.rss-link svg {
  width: 20px;
  height: 20px;
  color: #ff6600;
  transition: transform 0.2s ease;
}

.rss-link:hover svg {
  transform: scale(1.1);
}

.rss-text {
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

@media (max-width: 600px) {
  .rss-link {
    padding: 6px 10px;
    font-size: 0.85rem;
  }
  
  .rss-link svg {
    width: 18px;
    height: 18px;
  }
  
  .rss-text {
    display: none;
  }
}

/* Footer */
footer {
  border-top: 1px solid var(--border);
  color: var(--muted);
  margin-top: 48px;
  padding: 24px 0;
  text-align: center;
}

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

/* Share Section */
.share-section {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  margin: 32px 0;
  padding: 24px;
  background: var(--surface);
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

.share-section h2 {
  margin-top: 0;
}

.share-text {
  font-size: 1.1em;
  color: var(--muted);
  font-weight: 500;
  text-align: center;
}

.share-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  margin-top: 8px;
}

.share-btn {
  background: transparent !important;
  border: 2px solid rgba(255, 255, 255, 0.9) !important;
  color: rgba(255, 255, 255, 0.95) !important;
  padding: 10px 20px !important;
  font-size: 0.95rem !important;
  font-weight: 600 !important;
  transition: all 0.3s ease !important;
}

.share-btn:hover {
  background: rgba(255, 255, 255, 0.15) !important;
  border-color: rgba(255, 255, 255, 1) !important;
  color: #fff !important;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.share-btn:focus {
  outline: 2px solid rgba(255, 255, 255, 0.8) !important;
  outline-offset: 3px;
}

/* Email Form */
.email-collect-form {
  background: var(--surface);
  padding: 24px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  margin: 32px 0;
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
}

.email-collect-heading {
  margin-top: 0;
  text-align: center;
}

.email-collect-label {
  display: block;
  margin-bottom: 8px;
  font-weight: 600;
}

.email-collect-input {
  width: 100%;
  padding: 12px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  font-size: 1rem;
  font-family: var(--font);
  margin-bottom: 16px;
}

.email-collect-input:focus {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
  border-color: var(--accent);
}

.email-collect-button {
  width: 100%;
}

.email-collect-result {
  margin-top: 16px;
  padding: 12px;
  border-radius: 6px;
  text-align: center;
}

.result {
  background: rgba(46, 139, 87, 0.2);
  color: #90ee90;
}

.result.error {
  background: rgba(139, 0, 0, 0.2);
  color: #ff6b6b;
}

/* Accordions */
.accordion {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin: 20px 0;
  overflow: hidden;
}

.accordion-header {
  padding: 16px 20px;
  cursor: pointer;
  background: var(--panel);
  border-bottom: 1px solid transparent;
  transition: all 0.3s ease;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.accordion-header:hover {
  background: var(--surface);
  border-bottom-color: var(--border);
}

.accordion-header:focus {
  outline: 2px solid var(--focus-ring);
  outline-offset: -2px;
}

.accordion-arrow {
  font-size: 1.2em;
  transition: transform 0.3s ease;
  color: var(--muted);
}

.accordion.active .accordion-arrow {
  transform: rotate(180deg);
}

.accordion-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.3s ease;
  background: var(--surface);
}

.accordion.active .accordion-content {
  max-height: 1000px;
  padding: 16px 20px;
}

/* Animated Border Box */
.animated-border-box {
  padding: 20px;
  margin: 24px 0;
  border: 2px solid var(--accent);
  border-radius: var(--radius);
  background: linear-gradient(135deg, var(--surface) 0%, var(--panel) 100%);
  animation: pulse-border 3s ease-in-out infinite;
}

@keyframes pulse-border {
  0%, 100% { border-color: var(--accent); }
  50% { border-color: var(--accent-2); }
}

@media (prefers-reduced-motion: reduce) {
  .animated-border-box {
    animation: none;
  }
}

/* Gradients */
.gradient {
  background: linear-gradient(90deg, #6ea8fe, #a78bfa, #f6c76c);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  font-weight: 800;
}

.gradient2thoughts {
  background: linear-gradient(90deg, #1a1a2e 0%, #000000 100%);
  color: #fff;
  display: inline-block;
  padding: 12px 20px;
  border-radius: 8px;
  margin: 16px 0;
}

/* Two Column Layout */
.two-column-layout {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
  margin: 20px 0;
}

.column-header {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 16px;
  padding: 12px;
  background: var(--panel);
  border-radius: 8px;
  border-left: 4px solid var(--accent);
}

/* Image Accessibility */
img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius);
}

/* Focus Visible - Modern Accessibility */
*:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
  :root {
    --bg: #000;
    --panel: #111;
    --surface: #1a1a1a;
    --text: #fff;
    --muted: #ccc;
    --accent: #7bb3ff;
    --border: #444;
  }
}

/* Print Styles */
@media print {
  body {
    background: white;
    color: black;
  }
  
  .nav-container, .share-section, .email-collect-form, 
  .animated-border-box, footer, .skip-to-main {
    display: none;
  }
  
  a {
    color: #0000ff;
    text-decoration: underline;
  }
  
  pre, .info-box, .model-card {
    border: 1px solid #000;
    page-break-inside: avoid;
  }
}

/* Screen Reader Only Content */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}