/* Open Crown Standard - Stylesheet
 * Version: 2.0.0-draft
 * License: CC0 1.0 Universal
 */

/* ============================================
   Font Import - JetBrains Mono
   ============================================ */
@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:ital,wght@0,400;0,500;0,600;0,700;1,400&display=swap');

/* ============================================
   CSS Variables
   ============================================ */
:root {
  /* Colors */
  --color-bg: #fafafa;
  --color-bg-alt: #f5f5f5;
  --color-bg-code: #1e1e1e;
  --color-text: #1a1a1a;
  --color-text-muted: #666;
  --color-text-code: #e0e0e0;
  --color-link: #0066cc;
  --color-link-hover: #004499;
  --color-border: #e0e0e0;
  --color-accent: #2c5282;
  --color-badge-bg: #e2e8f0;
  --color-badge-text: #2d3748;
  --color-badge-draft: #f6ad55;
  --color-badge-draft-text: #744210;

  /* Syntax highlighting */
  --syntax-keyword: #c586c0;
  --syntax-string: #ce9178;
  --syntax-number: #b5cea8;
  --syntax-comment: #6a9955;
  --syntax-function: #dcdcaa;
  --syntax-type: #4ec9b0;
  --syntax-variable: #9cdcfe;
  --syntax-property: #9cdcfe;

  /* Typography */
  --font-mono: 'JetBrains Mono', monospace;
  --font-size-base: 16px;
  --font-size-sm: 14px;
  --font-size-xs: 12px;
  --font-size-lg: 18px;
  --font-size-xl: 24px;
  --font-size-2xl: 32px;
  --font-size-3xl: 40px;
  --line-height: 1.7;
  --line-height-tight: 1.3;

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

  /* Layout */
  --max-width: 900px;
  --max-width-narrow: 720px;
}

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

html {
  font-size: var(--font-size-base);
  scroll-behavior: smooth;
}

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

/* ============================================
   Typography
   ============================================ */
h1, h2, h3, h4, h5, h6 {
  margin: 0 0 var(--spacing-md);
  font-weight: 600;
  line-height: var(--line-height-tight);
}

h1 { font-size: var(--font-size-3xl); }
h2 { font-size: var(--font-size-2xl); margin-top: var(--spacing-2xl); }
h3 { font-size: var(--font-size-xl); margin-top: var(--spacing-xl); }
h4 { font-size: var(--font-size-lg); margin-top: var(--spacing-lg); }
h5, h6 { font-size: var(--font-size-base); margin-top: var(--spacing-lg); }

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

a {
  color: var(--color-link);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover,
a:focus {
  color: var(--color-link-hover);
  text-decoration: underline;
}

strong {
  font-weight: 600;
}

ul, ol {
  margin: 0 0 var(--spacing-md);
  padding-left: var(--spacing-xl);
}

li {
  margin-bottom: var(--spacing-xs);
}

/* ============================================
   Site Navigation
   ============================================ */
.site-nav {
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  padding: var(--spacing-md) var(--spacing-lg);
  position: sticky;
  top: 0;
  z-index: 50;
}

.nav-content {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

.nav-brand {
  font-weight: 700;
  font-size: var(--font-size-lg);
  color: var(--color-text);
  text-decoration: none;
}

.nav-brand:hover {
  color: var(--color-link);
  text-decoration: none;
}

.nav-links {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: var(--spacing-lg);
}

.nav-links a {
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: var(--font-size-sm);
  padding: var(--spacing-xs) 0;
  border-bottom: 2px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.nav-links a:hover {
  color: var(--color-link);
  text-decoration: none;
}

.nav-links a.active {
  color: var(--color-text);
  border-bottom-color: var(--color-accent);
}

/* ============================================
   Site Header
   ============================================ */
.site-header {
  background-color: var(--color-bg-alt);
  border-bottom: 1px solid var(--color-border);
  padding: var(--spacing-2xl) var(--spacing-lg);
  text-align: center;
}

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

.site-title {
  margin: 0 0 var(--spacing-sm);
  font-size: var(--font-size-3xl);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.site-subtitle {
  margin: 0 0 var(--spacing-md);
  font-size: var(--font-size-lg);
  color: var(--color-text-muted);
}

.site-meta {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  margin: 0;
  font-size: var(--font-size-sm);
}

.license-badge,
.status-badge {
  display: inline-block;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: 4px;
  font-size: var(--font-size-xs);
  font-weight: 500;
}

.license-badge {
  background-color: var(--color-badge-bg);
  color: var(--color-badge-text);
}

.status-badge {
  background-color: var(--color-badge-draft);
  color: var(--color-badge-draft-text);
}

.status-badge--draft {
  background-color: var(--color-badge-draft);
  color: var(--color-badge-draft-text);
}

.status-badge--review {
  background-color: #4299e1;
  color: white;
}

.status-badge--accepted {
  background-color: #48bb78;
  color: white;
}

.status-badge--implemented {
  background-color: #38a169;
  color: white;
}

.status-badge--rejected {
  background-color: #e53e3e;
  color: white;
}

.status-badge--superseded {
  background-color: #718096;
  color: white;
}

.type-badge {
  display: inline-block;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: 4px;
  font-size: var(--font-size-xs);
  font-weight: 500;
  background-color: var(--color-badge-bg);
  color: var(--color-badge-text);
}

.type-badge--core {
  background-color: #9f7aea;
  color: white;
}

.type-badge--interface {
  background-color: #4299e1;
  color: white;
}

.type-badge--meta {
  background-color: #ed8936;
  color: white;
}

.type-badge--informational {
  background-color: #38b2ac;
  color: white;
}

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

/* ============================================
   Table of Contents
   ============================================ */
.table-of-contents {
  max-width: var(--max-width);
  margin: var(--spacing-2xl) auto;
  padding: var(--spacing-lg);
  background-color: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: 8px;
}

.table-of-contents h2 {
  margin: 0 0 var(--spacing-md);
  font-size: var(--font-size-xl);
}

.table-of-contents h3 {
  margin: var(--spacing-lg) 0 var(--spacing-sm);
  font-size: var(--font-size-lg);
}

/* Headings carry their own section numbers (e.g. "1. Introduction",
   "3.1 Symbol Entity"), so the auto-list counter is suppressed to
   avoid double numbering like "3. 1. Introduction". */
.table-of-contents ol {
  margin: 0;
  padding-left: var(--spacing-lg);
  list-style: none;
}

.table-of-contents ol ol {
  margin-top: var(--spacing-xs);
  list-style: none;
}

.table-of-contents li {
  margin-bottom: var(--spacing-xs);
}

.table-of-contents a {
  color: var(--color-text);
  text-decoration: none;
}

.table-of-contents a:hover {
  color: var(--color-link);
  text-decoration: underline;
}

/* ============================================
   Main Content
   ============================================ */
.specification-content {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--spacing-xl) var(--spacing-lg) var(--spacing-3xl);
}

.abstract {
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-2xl);
  background-color: var(--color-bg-alt);
  border-left: 4px solid var(--color-accent);
  border-radius: 0 8px 8px 0;
}

.abstract h2 {
  margin-top: 0;
  font-size: var(--font-size-xl);
}

.spec-section {
  margin-bottom: var(--spacing-2xl);
  padding-bottom: var(--spacing-xl);
  border-bottom: 1px solid var(--color-border);
}

.spec-section:last-child {
  border-bottom: none;
}

.spec-section h2 {
  scroll-margin-top: var(--spacing-lg);
}

.spec-section h3,
.spec-section h4 {
  scroll-margin-top: var(--spacing-lg);
}

.appendices {
  margin-top: var(--spacing-2xl);
}

/* ============================================
   Code Blocks
   ============================================ */
code {
  font-family: var(--font-mono);
  font-size: var(--font-size-sm);
  background-color: var(--color-bg-alt);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: 4px;
}

pre {
  margin: var(--spacing-md) 0;
  padding: var(--spacing-lg);
  background-color: var(--color-bg-code);
  color: var(--color-text-code);
  border-radius: 8px;
  overflow-x: auto;
  line-height: 1.5;
}

pre code {
  background: none;
  padding: 0;
  font-size: var(--font-size-sm);
  color: inherit;
}

/* ============================================
   Syntax Highlighting (CSS-only)
   ============================================ */

/* Keywords: function, const, let, if, return, etc. */
pre code .keyword,
pre .keyword {
  color: var(--syntax-keyword);
}

/* Strings */
pre code .string,
pre .string {
  color: var(--syntax-string);
}

/* Numbers */
pre code .number,
pre .number {
  color: var(--syntax-number);
}

/* Comments */
pre code .comment,
pre .comment {
  color: var(--syntax-comment);
  font-style: italic;
}

/* Functions */
pre code .function,
pre .function {
  color: var(--syntax-function);
}

/* Types */
pre code .type,
pre .type {
  color: var(--syntax-type);
}

/* Variables */
pre code .variable,
pre .variable {
  color: var(--syntax-variable);
}

/* Properties */
pre code .property,
pre .property {
  color: var(--syntax-property);
}

/* JSON syntax highlighting support */
pre code[class*="json"] {
  color: var(--syntax-property);
}

/* Inline code in pre blocks - maintain consistent color */
pre code {
  color: var(--color-text-code);
}

/* ============================================
   Tables
   ============================================ */
table {
  width: 100%;
  margin: var(--spacing-md) 0;
  border-collapse: collapse;
  font-size: var(--font-size-sm);
}

th, td {
  padding: var(--spacing-sm) var(--spacing-md);
  text-align: left;
  border: 1px solid var(--color-border);
}

th {
  background-color: var(--color-bg-alt);
  font-weight: 600;
}

tr:nth-child(even) {
  background-color: var(--color-bg-alt);
}

/* ============================================
   Definition Lists
   ============================================ */
dl {
  margin: var(--spacing-md) 0;
}

dt {
  font-weight: 600;
  margin-top: var(--spacing-md);
}

dd {
  margin: var(--spacing-xs) 0 0 var(--spacing-lg);
  color: var(--color-text-muted);
}

/* ============================================
   Blockquotes
   ============================================ */
blockquote {
  margin: var(--spacing-md) 0;
  padding: var(--spacing-md) var(--spacing-lg);
  background-color: var(--color-bg-alt);
  border-left: 4px solid var(--color-border);
  font-style: italic;
}

blockquote p:last-child {
  margin-bottom: 0;
}

/* ============================================
   Footer
   ============================================ */
.site-footer {
  background-color: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
  padding: var(--spacing-2xl) var(--spacing-lg);
}

.footer-content {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  gap: var(--spacing-xl);
}

.footer-license {
  text-align: center;
}

.cc0-badge {
  margin: 0 0 var(--spacing-sm);
}

.cc0-badge img {
  display: inline-block;
}

.footer-contact ul {
  list-style: none;
  padding: 0;
  margin: var(--spacing-sm) 0 0;
}

.footer-contact li {
  margin-bottom: var(--spacing-xs);
}

.footer-meta {
  text-align: center;
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}

.footer-meta p {
  margin: 0;
}

/* ============================================
   Responsive Design
   ============================================ */

/* Tablet (max-width: 768px) */
@media (max-width: 768px) {
  :root {
    --font-size-base: 15px;
    --font-size-3xl: 32px;
    --font-size-2xl: 26px;
    --font-size-xl: 20px;
  }

  .nav-content {
    flex-direction: column;
    gap: var(--spacing-sm);
  }

  .nav-links {
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-md);
  }

  .site-header {
    padding: var(--spacing-xl) var(--spacing-md);
  }

  .site-title {
    font-size: var(--font-size-2xl);
  }

  .table-of-contents {
    margin: var(--spacing-lg);
    padding: var(--spacing-md);
  }

  .specification-content {
    padding: var(--spacing-lg) var(--spacing-md);
  }

  pre {
    padding: var(--spacing-md);
    font-size: var(--font-size-xs);
    border-radius: 6px;
  }

  table {
    display: block;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .footer-content {
    gap: var(--spacing-lg);
  }
}

/* Mobile (max-width: 480px) */
@media (max-width: 480px) {
  :root {
    --font-size-base: 14px;
    --font-size-3xl: 28px;
    --font-size-2xl: 22px;
    --font-size-xl: 18px;
    --font-size-lg: 16px;
  }

  .site-header {
    padding: var(--spacing-lg) var(--spacing-sm);
  }

  .site-meta {
    flex-direction: column;
    gap: var(--spacing-xs);
  }

  .table-of-contents {
    margin: var(--spacing-md);
    padding: var(--spacing-sm);
  }

  .table-of-contents ol {
    padding-left: var(--spacing-md);
  }

  .specification-content {
    padding: var(--spacing-md) var(--spacing-sm);
  }

  .abstract {
    padding: var(--spacing-md);
  }

  pre {
    padding: var(--spacing-sm);
    margin-left: calc(-1 * var(--spacing-sm));
    margin-right: calc(-1 * var(--spacing-sm));
    border-radius: 0;
  }

  th, td {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: var(--font-size-xs);
  }

  .footer-content {
    gap: var(--spacing-md);
  }

  .site-footer {
    padding: var(--spacing-lg) var(--spacing-sm);
  }
}

/* ============================================
   Content images
   ============================================ */
.specification-content img {
  max-width: 100%;
  width: auto;
  height: auto;
  display: block;
  margin: var(--spacing-xl) auto;
  padding: var(--spacing-md);
  border-radius: 6px;
  object-fit: contain;
  background-color: #ffffff;
}

/* Constrain architecture diagrams and wide images */
.specification-content p > img {
  max-height: 70vh;
}

/* ============================================
   Print Styles
   ============================================ */
@media print {
  body {
    background: white;
    color: black;
    font-size: 12pt;
  }

  .site-header {
    background: none;
    border-bottom: 2px solid black;
  }

  .table-of-contents {
    page-break-after: always;
    background: none;
    border: 1px solid black;
  }

  .spec-section {
    page-break-inside: avoid;
  }

  pre {
    background: #f5f5f5;
    color: black;
    border: 1px solid #ccc;
    page-break-inside: avoid;
  }

  a {
    color: black;
    text-decoration: underline;
  }

  a[href^="http"]::after {
    content: " (" attr(href) ")";
    font-size: 0.8em;
    color: #666;
  }

  .site-footer {
    background: none;
    border-top: 1px solid black;
  }

  .cc0-badge img {
    display: none;
  }
}

/* ============================================
   Accessibility
   ============================================ */

/* Focus styles */
a:focus,
button:focus {
  outline: 2px solid var(--color-link);
  outline-offset: 2px;
}

/* Skip link for keyboard navigation */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--color-accent);
  color: white;
  padding: var(--spacing-sm) var(--spacing-md);
  z-index: 100;
  transition: top 0.2s;
}

.skip-link:focus {
  top: 0;
}

/* Reduced motion preference */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  :root {
    --color-border: #000;
    --color-text-muted: #333;
    --color-link: #0000ee;
  }

  .license-badge,
  .status-badge {
    border: 1px solid currentColor;
  }
}

/* ============================================
   Dark Mode (if OS prefers)
   ============================================ */
@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #1a1a1a;
    --color-bg-alt: #242424;
    --color-bg-code: #0d0d0d;
    --color-text: #e0e0e0;
    --color-text-muted: #a0a0a0;
    --color-link: #6bb3ff;
    --color-link-hover: #99ccff;
    --color-border: #333;
    --color-accent: #6bb3ff;
    --color-badge-bg: #333;
    --color-badge-text: #e0e0e0;
    --color-badge-draft: #744210;
    --color-badge-draft-text: #f6ad55;
  }

  code {
    background-color: var(--color-bg-alt);
  }

  .cc0-badge img {
    filter: invert(1) hue-rotate(180deg);
  }
}