/* --- Global Design Tokens & Resets --- */
:root {
  --color-primary: #243b55;
  --color-secondary: #6b8299;
  --color-accent: #c0563c;
  --color-surface: #f5f6f8;
  --color-surface-white: #ffffff;
  --color-ink: #131f2e;
  --color-border: #d2d7df;
  --color-border-dark: #243b55;
  --font-serif: 'Crimson Pro', Georgia, 'Times New Roman', serif;
  --font-condensed: 'Asap Condensed', sans-serif;
  --max-width: 920px;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 18px;
  background-color: #e9ecef;
  color: var(--color-ink);
  -webkit-font-smoothing: antialiased;
}

body.om-body {
  font-family: var(--font-serif);
  line-height: 1.7;
  color: var(--color-ink);
  padding: 2rem 0.75rem;
  min-height: 100vh;
}

/* --- Viewport Frame & Shared Visual Field (Corner Brand Chrome) --- */
.om-viewport-frame {
  max-width: var(--max-width);
  margin: 0 auto;
}

.om-shared-field {
  position: relative;
  background: var(--color-surface-white);
  border: 2px solid var(--color-border-dark);
  box-shadow: 6px 6px 0px rgba(36, 59, 85, 0.12);
  padding: 2.5rem 2rem 2rem 2rem;
  margin-top: 1.5rem;
}

/* Oversized Brand Wordmark in Top-Left Overlapping Content Block */
.om-brand-badge {
  position: absolute;
  top: -1.4rem;
  left: 1.5rem;
  z-index: 10;
  background: var(--color-primary);
  border: 2px solid var(--color-ink);
  box-shadow: 3px 3px 0 var(--color-accent);
  padding: 0.35rem 1rem;
}

.om-brand-link {
  text-decoration: none;
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.om-brand-title {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 700;
  color: #ffffff;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.om-brand-subtitle {
  font-family: var(--font-condensed);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-surface);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-top: 2px;
}

/* Top Bar & Nav Cluster Top-Right */
.om-top-bar {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  margin-bottom: 2rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--color-border);
}

.om-nav-cluster {
  display: flex;
  align-items: center;
}

.om-nav-list {
  display: flex;
  list-style: none;
  gap: 1.25rem;
  margin: 0;
  padding: 0;
}

.om-nav-link {
  font-family: var(--font-condensed);
  font-size: 0.95rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-secondary);
  text-decoration: none;
  padding: 0.2rem 0.4rem;
  border-bottom: 2px solid transparent;
  transition: color 0.15s ease, border-color 0.15s ease;
}

.om-nav-link:hover,
.om-nav-link.om-nav-active {
  color: var(--color-primary);
  border-bottom-color: var(--color-accent);
}

/* --- Homepage Opening (Single title line + TOC Table) --- */
.om-single-title-line {
  font-family: var(--font-serif);
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.25;
  margin-bottom: 1.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--color-primary);
}

.om-toc-section {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  padding: 1.25rem;
  margin-bottom: 2.5rem;
}

.om-toc-header-bar {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 0.4rem;
}

.om-toc-badge {
  font-family: var(--font-condensed);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  background: var(--color-primary);
  color: #fff;
  padding: 0.15rem 0.5rem;
}

.om-toc-sub {
  font-family: var(--font-serif);
  font-size: 0.95rem;
  font-style: italic;
  color: var(--color-secondary);
}

.om-toc-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
  text-align: left;
}

.om-toc-table th {
  font-family: var(--font-condensed);
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-primary);
  padding: 0.5rem 0.75rem;
  border-bottom: 2px solid var(--color-secondary);
}

.om-toc-table td {
  padding: 0.75rem;
  border-bottom: 1px dashed var(--color-border);
  vertical-align: top;
}

.om-toc-table tr:last-child td {
  border-bottom: none;
}

.om-col-num {
  width: 5%;
  font-family: var(--font-condensed);
  font-weight: 600;
  color: var(--color-accent);
}

.om-col-name {
  width: 30%;
  font-weight: 600;
  color: var(--color-primary);
}

.om-col-desc {
  width: 65%;
  color: var(--color-ink);
}

/* --- Dense Article Index System (Leader dots) --- */
.om-dense-section {
  margin-top: 2.5rem;
  margin-bottom: 2rem;
}

.om-section-heading,
.om-page-title {
  font-family: var(--font-serif);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 1.25rem;
  padding-bottom: 0.3rem;
  border-bottom: 1px solid var(--color-primary);
}

.om-page-lead {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-style: italic;
  color: var(--color-secondary);
  margin-bottom: 1.75rem;
}

.om-dense-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.om-dense-item {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  padding: 0.55rem 0;
  border-bottom: 1px solid var(--color-surface);
}

.om-dense-link {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.15s ease;
  white-space: normal;
}

.om-dense-link:hover {
  color: var(--color-accent);
  text-decoration: underline;
}

.om-leader-dots {
  flex: 1;
  border-bottom: 1px dotted var(--color-secondary);
  min-width: 2rem;
  margin: 0 0.25rem;
}

.om-dense-date {
  font-family: var(--font-condensed);
  font-size: 0.9rem;
  color: var(--color-secondary);
  white-space: nowrap;
}

/* --- Mandatory Explicit List Rules for BOTH Content Containers --- */
.om-intro-content ul,
.om-intro-content ol,
.om-article-body ul,
.om-article-body ol {
  margin-top: 1rem;
  margin-bottom: 1.5rem;
  padding-left: 2rem;
}

.om-intro-content li,
.om-article-body li {
  margin-bottom: 0.5rem;
  line-height: 1.7;
}

.om-intro-content ul li,
.om-article-body ul li {
  list-style-type: square;
}

.om-intro-content ol li,
.om-article-body ol li {
  list-style-type: decimal;
}

/* --- Content Prose Styling --- */
.om-intro-content p,
.om-article-body p {
  margin-bottom: 1.4rem;
  font-size: 1.05rem;
  line-height: 1.75;
}

.om-article-body h2 {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-top: 2.2rem;
  margin-bottom: 0.8rem;
  padding-bottom: 0.25rem;
  border-bottom: 1px solid var(--color-border);
}

.om-article-body h3 {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-top: 1.6rem;
  margin-bottom: 0.6rem;
}

.om-article-body blockquote {
  border-left: 4px solid var(--color-accent);
  background: var(--color-surface);
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
  font-style: italic;
  color: var(--color-ink);
}

.om-article-body a,
.om-intro-content a {
  color: var(--color-primary);
  text-decoration: underline;
  text-decoration-color: var(--color-accent);
  text-underline-offset: 3px;
}

.om-article-body a:hover,
.om-intro-content a:hover {
  color: var(--color-accent);
}

.om-article-header {
  margin-bottom: 2rem;
  padding-bottom: 1.25rem;
  border-bottom: 2px solid var(--color-primary);
}

.om-article-meta {
  font-family: var(--font-condensed);
  font-size: 0.85rem;
  color: var(--color-secondary);
  margin-bottom: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.om-meta-tag {
  color: var(--color-accent);
  font-weight: 600;
}

.om-meta-sep {
  margin: 0 0.4rem;
}

.om-article-title {
  font-family: var(--font-serif);
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.25;
  margin-bottom: 0.75rem;
}

.om-article-standfirst {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-style: italic;
  color: var(--color-secondary);
  line-height: 1.6;
}

.om-article-footer {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
}

.om-back-link a {
  font-family: var(--font-condensed);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-primary);
  text-decoration: none;
}

.om-back-link a:hover {
  color: var(--color-accent);
  text-decoration: underline;
}

/* --- Instrument Table Component within Articles --- */
.om-article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.75rem 0;
  font-size: 0.95rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
}

.om-article-body th {
  font-family: var(--font-condensed);
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background: var(--color-primary);
  color: #fff;
  padding: 0.6rem 0.75rem;
  text-align: left;
}

.om-article-body td {
  padding: 0.6rem 0.75rem;
  border-bottom: 1px solid var(--color-border);
}

/* --- Footer --- */
.om-instrument-footer {
  margin-top: 3.5rem;
  padding-top: 1.5rem;
  border-top: 2px solid var(--color-primary);
  font-size: 0.9rem;
}

.om-footer-meta {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  margin-bottom: 0.75rem;
}

.om-footer-title {
  font-family: var(--font-serif);
  font-weight: 700;
  color: var(--color-primary);
}

.om-footer-tagline {
  font-family: var(--font-serif);
  font-style: italic;
  color: var(--color-secondary);
}

.om-footer-disclaimer {
  font-size: 0.85rem;
  line-height: 1.5;
  color: var(--color-secondary);
  margin-bottom: 1rem;
  background: var(--color-surface);
  padding: 0.75rem 1rem;
  border-left: 3px solid var(--color-secondary);
}

.om-footer-nav {
  font-family: var(--font-condensed);
  font-size: 0.9rem;
}

.om-footer-nav a {
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 600;
}

.om-footer-nav a:hover {
  color: var(--color-accent);
}

.om-sep {
  margin: 0 0.5rem;
  color: var(--color-secondary);
}

/* --- Mobile Responsiveness (375px Viewport) --- */
@media (max-width: 640px) {
  body.om-body {
    padding: 1.25rem 0.4rem;
  }

  .om-shared-field {
    padding: 2.2rem 0.85rem 1.25rem 0.85rem;
    margin-top: 1.2rem;
  }

  .om-brand-badge {
    top: -1.2rem;
    left: 0.75rem;
    padding: 0.25rem 0.6rem;
  }

  .om-brand-title {
    font-size: 1.05rem;
  }

  .om-brand-subtitle {
    font-size: 0.7rem;
  }

  .om-top-bar {
    margin-bottom: 1.25rem;
    padding-bottom: 0.5rem;
  }

  .om-nav-list {
    gap: 0.6rem;
  }

  .om-nav-link {
    font-size: 0.85rem;
    padding: 0.1rem 0.2rem;
  }

  .om-single-title-line {
    font-size: 1.6rem;
    margin-bottom: 1.25rem;
  }

  .om-toc-table {
    display: block;
  }

  .om-toc-table thead {
    display: none;
  }

  .om-toc-table tbody,
  .om-toc-table tr,
  .om-toc-table td {
    display: block;
    width: 100%;
  }

  .om-toc-table tr {
    margin-bottom: 0.75rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px dashed var(--color-border);
  }

  .om-toc-table td {
    padding: 0.2rem 0;
    border-bottom: none;
  }

  .om-col-num {
    display: inline-block;
    width: auto;
    margin-right: 0.4rem;
  }

  .om-col-name {
    display: inline-block;
    width: auto;
  }

  .om-dense-item {
    flex-wrap: wrap;
    gap: 0.25rem;
  }

  .om-leader-dots {
    display: none;
  }

  .om-dense-date {
    width: 100%;
    font-size: 0.8rem;
  }

  .om-article-title {
    font-size: 1.5rem;
  }
}