/* ============================================================
   Proso Legal Document Stylesheet
   Pure CSS, system fonts, dark/light mode, print-friendly
   ============================================================ */

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

:root {
  /* Light mode (default) */
  --bg: #fefefe;
  --bg-sidebar: #f7f7f5;
  --text: #1a1a1a;
  --text-secondary: #555;
  --text-muted: #777;
  --heading: #111;
  --link: #2563eb;
  --link-hover: #1d4ed8;
  --border: #e5e5e5;
  --border-light: #eee;
  --table-stripe: #f9f9f7;
  --table-header-bg: #f3f3f1;
  --focus-ring: #2563eb;
  --brand: #2563eb;
  --code-bg: #f3f4f6;

  --font-body: Georgia, 'Times New Roman', serif;
  --font-heading: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;

  --content-max: 720px;
  --sidebar-width: 240px;
  --gap: 3rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1a1a1a;
    --bg-sidebar: #222;
    --text: #e0e0e0;
    --text-secondary: #aaa;
    --text-muted: #888;
    --heading: #f0f0f0;
    --link: #60a5fa;
    --link-hover: #93c5fd;
    --border: #333;
    --border-light: #2a2a2a;
    --table-stripe: #222;
    --table-header-bg: #2a2a2a;
    --focus-ring: #60a5fa;
    --brand: #60a5fa;
    --code-bg: #2a2a2a;
  }
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 2rem;
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

/* --- Skip Navigation --- */
.skip-nav {
  position: absolute;
  top: -100%;
  left: 1rem;
  z-index: 1000;
  padding: 0.5rem 1rem;
  font-family: var(--font-heading);
  font-size: 0.875rem;
  color: #fff;
  background: var(--brand);
  border-radius: 0 0 4px 4px;
  text-decoration: none;
}

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

/* --- Focus Indicators --- */
a:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
  border-radius: 2px;
}

/* --- Header --- */
.legal-header {
  border-bottom: 1px solid var(--border);
  padding: 1.5rem 0;
}

.legal-header__inner {
  max-width: calc(var(--content-max) + var(--sidebar-width) + var(--gap));
  margin: 0 auto;
  padding: 0 1.5rem;
}

.legal-header__brand {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--heading);
  text-decoration: none;
}

.legal-header__brand span {
  color: var(--brand);
}

/* --- Layout --- */
.legal-layout {
  max-width: calc(var(--content-max) + var(--sidebar-width) + var(--gap));
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  gap: var(--gap);
  align-items: start;
}

/* --- Sidebar / Table of Contents --- */
.toc {
  position: sticky;
  top: 2rem;
  max-height: calc(100vh - 4rem);
  overflow-y: auto;
  padding-right: 1rem;
}

.toc__title {
  font-family: var(--font-heading);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.toc__list {
  list-style: none;
  font-family: var(--font-heading);
  font-size: 0.8125rem;
  line-height: 1.4;
}

.toc__list li {
  margin-bottom: 0.25rem;
}

.toc__list a {
  color: var(--text-secondary);
  text-decoration: none;
  display: block;
  padding: 0.2rem 0;
  border-left: 2px solid transparent;
  padding-left: 0.75rem;
  transition: color 0.15s, border-color 0.15s;
}

.toc__list a:hover {
  color: var(--link);
  border-left-color: var(--link);
}

/* --- Main Content --- */
.legal-content {
  min-width: 0;
}

/* --- Document Meta --- */
.legal-meta {
  margin-bottom: 2.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
}

.legal-meta h1 {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 700;
  color: var(--heading);
  line-height: 1.2;
  margin-bottom: 0.75rem;
}

.legal-meta__dates {
  font-family: var(--font-heading);
  font-size: 0.875rem;
  color: var(--text-muted);
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.5rem;
}

.legal-meta__version {
  font-family: var(--font-heading);
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-top: 0.5rem;
}

.legal-meta__version a {
  color: var(--link);
  text-decoration: none;
}

.legal-meta__version a:hover {
  text-decoration: underline;
}

/* --- Disclaimer Banner --- */
.legal-disclaimer {
  font-family: var(--font-heading);
  font-size: 0.8125rem;
  color: var(--text-muted);
  background: var(--bg-sidebar);
  border: 1px solid var(--border-light);
  border-radius: 4px;
  padding: 0.75rem 1rem;
  margin-bottom: 2rem;
  line-height: 1.5;
}

/* --- Sections --- */
.legal-content section {
  margin-bottom: 2.5rem;
}

.legal-content h2 {
  font-family: var(--font-heading);
  font-size: 1.375rem;
  font-weight: 600;
  color: var(--heading);
  margin-bottom: 1rem;
  padding-top: 1rem;
  line-height: 1.3;
}

.legal-content h3 {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--heading);
  margin-top: 1.5rem;
  margin-bottom: 0.75rem;
  line-height: 1.3;
}

.legal-content p {
  margin-bottom: 1rem;
}

.legal-content p:last-child {
  margin-bottom: 0;
}

/* --- Lists --- */
.legal-content ul,
.legal-content ol {
  margin-bottom: 1rem;
  padding-left: 1.5rem;
}

.legal-content li {
  margin-bottom: 0.5rem;
}

.legal-content li:last-child {
  margin-bottom: 0;
}

/* --- Definition Lists --- */
.legal-content dl {
  margin-bottom: 1.5rem;
}

.legal-content dt {
  font-weight: 700;
  color: var(--heading);
  margin-top: 1rem;
  margin-bottom: 0.25rem;
}

.legal-content dt:first-child {
  margin-top: 0;
}

.legal-content dd {
  margin-left: 0;
  padding-left: 1.5rem;
  border-left: 2px solid var(--border-light);
  margin-bottom: 0.5rem;
  color: var(--text-secondary);
}

/* --- Tables --- */
.legal-content table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 1.5rem;
  font-family: var(--font-heading);
  font-size: 0.9rem;
}

.legal-content thead th {
  background: var(--table-header-bg);
  font-weight: 600;
  text-align: left;
  padding: 0.75rem 1rem;
  border-bottom: 2px solid var(--border);
  color: var(--heading);
  white-space: nowrap;
}

.legal-content tbody td {
  padding: 0.625rem 1rem;
  border-bottom: 1px solid var(--border-light);
  vertical-align: top;
}

.legal-content tbody tr:nth-child(even) {
  background: var(--table-stripe);
}

/* --- Code --- */
.legal-content code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--code-bg);
  padding: 0.15em 0.35em;
  border-radius: 3px;
}

/* --- Links --- */
.legal-content a {
  color: var(--link);
  text-decoration: underline;
  text-underline-offset: 2px;
}

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

/* --- Strong --- */
.legal-content strong {
  color: var(--heading);
}

/* --- Footer --- */
.legal-footer {
  border-top: 1px solid var(--border);
  padding: 1.5rem 0;
  text-align: center;
}

.legal-footer__inner {
  max-width: calc(var(--content-max) + var(--sidebar-width) + var(--gap));
  margin: 0 auto;
  padding: 0 1.5rem;
  font-family: var(--font-heading);
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.legal-footer__inner a {
  color: var(--link);
  text-decoration: none;
}

.legal-footer__inner a:hover {
  text-decoration: underline;
}

/* --- Mobile: Collapsible TOC --- */
@media (max-width: 768px) {
  .legal-layout {
    grid-template-columns: 1fr;
    gap: 0;
    padding: 1rem 1rem 3rem;
  }

  .toc {
    position: static;
    max-height: none;
    overflow: visible;
    padding-right: 0;
    margin-bottom: 2rem;
  }

  .toc__details {
    border: 1px solid var(--border);
    border-radius: 4px;
    background: var(--bg-sidebar);
  }

  .toc__details summary {
    font-family: var(--font-heading);
    font-size: 0.875rem;
    font-weight: 600;
    padding: 0.75rem 1rem;
    cursor: pointer;
    color: var(--heading);
    list-style: none;
  }

  .toc__details summary::-webkit-details-marker {
    display: none;
  }

  .toc__details summary::before {
    content: '\25B6';
    display: inline-block;
    margin-right: 0.5rem;
    font-size: 0.75em;
    transition: transform 0.15s;
  }

  .toc__details[open] summary::before {
    transform: rotate(90deg);
  }

  .toc__details .toc__list {
    padding: 0 1rem 0.75rem;
  }

  .toc__title {
    display: none;
  }

  .legal-meta h1 {
    font-size: 1.5rem;
  }

  .legal-content h2 {
    font-size: 1.25rem;
  }

  .legal-content table {
    font-size: 0.8rem;
  }

  .legal-content thead th,
  .legal-content tbody td {
    padding: 0.5rem 0.625rem;
  }
}

/* --- Print --- */
@media print {
  *,
  *::before,
  *::after {
    background: transparent !important;
    color: #000 !important;
    box-shadow: none !important;
  }

  body {
    font-size: 11pt;
    line-height: 1.5;
  }

  .skip-nav,
  .legal-header,
  .toc,
  .legal-footer,
  .legal-disclaimer {
    display: none !important;
  }

  .legal-layout {
    display: block;
    max-width: none;
    padding: 0;
  }

  .legal-meta {
    border-bottom: 1pt solid #000;
    padding-bottom: 12pt;
    margin-bottom: 18pt;
  }

  .legal-meta h1 {
    font-size: 18pt;
  }

  .legal-content h2 {
    font-size: 14pt;
    page-break-after: avoid;
    padding-top: 12pt;
  }

  .legal-content h3 {
    font-size: 12pt;
    page-break-after: avoid;
  }

  .legal-content section {
    page-break-inside: avoid;
  }

  .legal-content table {
    page-break-inside: avoid;
  }

  .legal-content a {
    text-decoration: none;
  }

  .legal-content a[href^="http"]::after {
    content: ' (' attr(href) ')';
    font-size: 0.8em;
    color: #555 !important;
  }

  @page {
    margin: 2cm;
  }
}