/* OX Design System — shared stylesheet.
   Canonical reference: /design-system.html */

/* --- Tokens --- */
:root {
  /* Space */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2.5rem;
  --space-2xl: 4rem;
  --space-3xl: 5.5rem;

  /* Type */
  --text-caption: 0.875rem;    /* 14px — timestamps, floor */
  --text-ui: 1rem;             /* 16px — descriptions, nav, sublinks */
  --text-body: 1.1875rem;      /* 19px — prose, long-form */
  --text-section: 0.875rem;    /* 14px — section banner label */
  --text-subhead: 1.3125rem;   /* 21px */
  --text-title: 1.375rem;      /* 22px — card title */
  --text-heading: clamp(2.25rem, 1.75rem + 1.75vw, 2.75rem);

  /* Color */
  --bg: #fafbfc;
  --surface: #ffffff;
  --surface-subtle: #eef1f5;
  --border: #dadce0;
  --border-hover: #9aa0a6;
  --text: #202124;
  --text-strong: #1a1a1a;
  --text-muted: #5f6368;
  --text-faint: #80868b;
  --accent: #6b7436;
  --urgent: #c2185b;

  /* Functional status colors */
  --status-done-bg: #1a1a1a;
  --status-done-fg: #ffffff;
  --status-active-bg: #e8f5e9;
  --status-active-fg: #2e7d32;
  --status-waiting-bg: #fff3e0;
  --status-waiting-fg: #c77700;
  --status-initial-bg: #e3f2fd;
  --status-initial-fg: #1565c0;
  --status-empty-bg: #f1f3f4;
  --status-empty-fg: #80868b;

  /* Radii */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
}

/* --- Reset + base --- */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: 'Source Serif 4', Georgia, serif;
  font-size: var(--text-body);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

/* --- Layout --- */
.container {
  max-width: 44rem;
  margin: 0 auto;
  padding: var(--space-lg) var(--space-lg) var(--space-3xl);
}
.container--wide {
  max-width: 100rem;
}

/* --- Breadcrumb nav --- */
.nav {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-sm);
  font-family: 'DM Sans', sans-serif;
  font-size: var(--text-ui);
  color: var(--text-muted);
  margin-bottom: var(--space-xl);
  padding-top: var(--space-sm);
}
.nav a {
  color: var(--text-muted);
  text-decoration: underline;
  text-underline-offset: 2px;
  padding: 0.25rem 0.5rem;
  margin-left: -0.5rem;
  border-radius: var(--radius-sm);
}
.nav a:hover { color: var(--text-strong); background: var(--surface-subtle); }
.nav .sep { color: var(--text-faint); }
.nav .current { color: var(--text-strong); font-weight: 500; }

/* --- Page header --- */
header { margin-bottom: var(--space-2xl); }
.section-label {
  font-family: 'DM Sans', sans-serif;
  font-size: var(--text-caption);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--text-muted);
  margin-bottom: var(--space-sm);
}
h1 {
  font-family: 'Source Serif 4', Georgia, serif;
  font-size: var(--text-heading);
  font-weight: 700;
  color: var(--text-strong);
  line-height: 1.15;
  letter-spacing: -0.02em;
}
.subtitle {
  font-family: 'DM Sans', sans-serif;
  font-size: var(--text-ui);
  color: var(--text-muted);
  line-height: 1.6;
  margin-top: var(--space-sm);
}
.last-updated {
  font-family: 'DM Sans', sans-serif;
  font-size: var(--text-caption);
  color: var(--text-faint);
  margin-top: var(--space-sm);
}

/* --- Intro box (short contextual paragraph above content) --- */
.intro {
  font-family: 'DM Sans', sans-serif;
  font-size: var(--text-ui);
  color: var(--text);
  line-height: 1.65;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-md) var(--space-lg);
  margin-bottom: var(--space-xl);
}
.intro strong { color: var(--text-strong); }

/* --- Prose (long-form reading content) --- */
.prose { font-family: 'Source Serif 4', Georgia, serif; }
.prose p { margin-bottom: var(--space-md); }
.prose p:last-child { margin-bottom: 0; }
.prose h2 {
  font-family: 'DM Sans', sans-serif;
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-strong);
  letter-spacing: -0.01em;
  margin-top: var(--space-xl);
  margin-bottom: var(--space-md);
}
.prose h3 {
  font-family: 'DM Sans', sans-serif;
  font-size: var(--text-subhead);
  font-weight: 600;
  color: var(--text-strong);
  letter-spacing: -0.01em;
  margin-top: var(--space-xl);
  margin-bottom: var(--space-sm);
}
.prose h4 {
  font-family: 'DM Sans', sans-serif;
  font-size: var(--text-ui);
  font-weight: 600;
  color: var(--text-strong);
  margin-top: var(--space-md);
  margin-bottom: var(--space-xs);
}
.prose ul, .prose ol {
  padding-left: 1.5rem;
  margin-bottom: var(--space-md);
}
.prose ul { list-style: disc; }
.prose ol { list-style: decimal; }
.prose li { margin-bottom: var(--space-xs); line-height: 1.6; }
.prose strong { color: var(--text-strong); font-weight: 600; }
.prose em { font-style: italic; }
.prose a {
  color: var(--text);
  text-decoration: underline;
  text-underline-offset: 2px;
  text-decoration-color: var(--border-hover);
}
.prose a:hover { text-decoration-color: var(--text-strong); }
.prose code {
  font-family: 'SF Mono', Menlo, Consolas, monospace;
  font-size: 0.9375em;
  background: var(--surface-subtle);
  padding: 0.125rem 0.375rem;
  border-radius: var(--radius-sm);
  color: var(--text-strong);
}

/* --- Collapsible section with olive banner --- */
details.section {
  margin-bottom: var(--space-md);
}
details.section > summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem var(--space-md);
  background: var(--accent);
  border-radius: var(--radius-md);
  font-family: 'DM Sans', sans-serif;
  font-size: var(--text-section);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: #ffffff;
  user-select: none;
}
details.section > summary::-webkit-details-marker { display: none; }
details.section > summary::after {
  content: "";
  display: inline-block;
  width: 1.25rem;
  height: 1.25rem;
  flex-shrink: 0;
  background-color: #ffffff;
  -webkit-mask: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'><polyline points='9 18 15 12 9 6'/></svg>") no-repeat center / contain;
          mask: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'><polyline points='9 18 15 12 9 6'/></svg>") no-repeat center / contain;
  transition: transform 0.2s ease;
}
details.section[open] > summary::after { transform: rotate(90deg); }
.section-body { padding: var(--space-md) 0 var(--space-xl); }

/* --- Card grid (hub pages) --- */
.card-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}
a.entry, div.entry--has-sublinks {
  display: block;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-md) var(--space-lg);
  text-decoration: none;
  color: var(--text);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
a.entry:hover, div.entry--has-sublinks:hover {
  border-color: var(--border-hover);
  box-shadow: 0 2px 8px rgba(0,0,0,0.04);
}
.entry-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-md);
  flex-wrap: wrap;
}
.entry-title {
  font-family: 'DM Sans', sans-serif;
  font-size: var(--text-title);
  font-weight: 600;
  color: var(--text-strong);
  line-height: 1.3;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}
.entry-date {
  font-family: 'DM Sans', sans-serif;
  font-size: var(--text-caption);
  font-weight: 500;
  color: var(--text-faint);
  white-space: nowrap;
  letter-spacing: 0.02em;
}
.dot-urgent {
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background: var(--urgent);
  flex-shrink: 0;
}
.entry-desc {
  font-family: 'DM Sans', sans-serif;
  font-size: var(--text-ui);
  color: var(--text-muted);
  line-height: 1.5;
  margin-top: var(--space-xs);
}
.entry-main {
  display: block;
  text-decoration: none;
  color: inherit;
}
.entry-sublinks {
  list-style: none;
  margin-top: var(--space-sm);
  border-top: 1px solid var(--border);
  padding-top: var(--space-sm);
}
.entry-sublinks li {
  font-family: 'DM Sans', sans-serif;
  font-size: var(--text-ui);
  line-height: 1.8;
}
.entry-sublinks a {
  color: var(--text-muted);
  text-decoration: underline;
  text-underline-offset: 2px;
  text-decoration-color: var(--border-hover);
}
.entry-sublinks a:hover {
  color: var(--text-strong);
  text-decoration-color: var(--text-strong);
}

/* --- Callouts --- */
.callout {
  font-family: 'DM Sans', sans-serif;
  font-size: var(--text-ui);
  color: var(--text);
  line-height: 1.6;
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 3px solid var(--border-hover);
  border-radius: var(--radius-md);
  padding: var(--space-md) var(--space-lg);
  margin: var(--space-md) 0;
}
.callout strong { color: var(--text-strong); font-weight: 600; }
.callout.green { border-left-color: #2e7d32; }
.callout.warning { border-left-color: #c62828; }
.callout.caution { border-left-color: #c77700; }

/* --- Note box (dated inline callout) --- */
.note-box {
  font-family: 'DM Sans', sans-serif;
  font-size: var(--text-ui);
  color: var(--text);
  background: #fff8e1;
  border-left: 4px solid #f9a825;
  padding: 0.75rem var(--space-md);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin-bottom: var(--space-lg);
  line-height: 1.55;
}
.note-box strong { color: #c77700; font-weight: 600; }
.note-box .note-date {
  color: var(--text-faint);
  font-size: var(--text-caption);
}

/* --- Info table (compact reference data) --- */
.info-table {
  width: 100%;
  border-collapse: collapse;
  font-family: 'DM Sans', sans-serif;
  font-size: var(--text-ui);
  margin-bottom: var(--space-md);
}
.info-table th {
  font-size: var(--text-caption);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  padding: 0 0.625rem var(--space-sm) 0;
  text-align: left;
  border-bottom: 1px solid var(--border);
}
.info-table td {
  padding: 0.5rem 0.625rem 0.5rem 0;
  border-top: 1px solid var(--border);
  vertical-align: top;
  line-height: 1.5;
  color: var(--text);
}
.info-table td:first-child {
  font-weight: 600;
  color: var(--text-muted);
  padding-right: var(--space-md);
  white-space: nowrap;
}
.info-table tr.highlight td {
  font-weight: 600;
  color: var(--text-strong);
}

/* --- Wide data table (dashboards) --- */
.table-wrap {
  -webkit-overflow-scrolling: touch;
  overflow-x: auto;
  margin-bottom: var(--space-xl);
}
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-family: 'DM Sans', sans-serif;
  font-size: var(--text-ui);
}
.data-table thead th {
  text-align: left;
  font-size: var(--text-caption);
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: var(--space-sm) var(--space-md);
  border-bottom: 2px solid var(--border);
  white-space: nowrap;
  position: sticky;
  top: 0;
  background: var(--bg);
  z-index: 1;
}
.data-table tbody td {
  padding: 0.625rem var(--space-md);
  border-bottom: 1px solid var(--border);
  vertical-align: top;
  color: var(--text);
}
.data-table tbody tr:nth-child(even):not(.section-row) {
  background: var(--surface);
}
.data-table tbody tr:hover:not(.section-row) {
  background: var(--surface-subtle);
}
.data-table tbody tr.inactive td { color: var(--text-faint); }
.data-table .section-row td {
  padding: var(--space-lg) var(--space-md) var(--space-sm);
  border-bottom: 2px solid var(--border);
  font-size: var(--text-caption);
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  background: var(--bg);
}

/* --- Status pills --- */
.status {
  display: inline-block;
  padding: 0.125rem 0.625rem;
  border-radius: 999px;
  font-family: 'DM Sans', sans-serif;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  white-space: nowrap;
}
.status.done { background: var(--status-done-bg); color: var(--status-done-fg); }
.status.active { background: var(--status-active-bg); color: var(--status-active-fg); }
.status.waiting { background: var(--status-waiting-bg); color: var(--status-waiting-fg); }
.status.initial { background: var(--status-initial-bg); color: var(--status-initial-fg); }
.status.empty { background: var(--status-empty-bg); color: var(--status-empty-fg); }
.status + .status { margin-top: 0.25rem; }

/* --- Stat cards --- */
.stat-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-sm);
  margin-bottom: var(--space-xl);
}
.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-md) var(--space-lg);
  text-align: center;
}
.stat-label {
  font-family: 'DM Sans', sans-serif;
  font-size: var(--text-caption);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 0.375rem;
}
.stat-value {
  font-family: 'Source Serif 4', Georgia, serif;
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-strong);
  line-height: 1.1;
}
.stat-sub {
  font-family: 'DM Sans', sans-serif;
  font-size: var(--text-caption);
  color: var(--text-muted);
  margin-top: 0.25rem;
}

/* --- Top link row (buttons above hero content) --- */
.top-links {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
  margin-top: var(--space-md);
}
.top-links a {
  font-family: 'DM Sans', sans-serif;
  font-size: var(--text-ui);
  font-weight: 500;
  color: var(--accent);
  text-decoration: none;
  padding: 0.375rem 0.875rem;
  border: 1px solid var(--accent);
  border-radius: var(--radius-sm);
  transition: background 0.15s ease, color 0.15s ease;
}
.top-links a:hover {
  background: var(--accent);
  color: #ffffff;
}

/* --- Back to top: floating pill, fixed bottom-right, revealed on scroll --- */
.back-to-top {
  position: fixed;
  bottom: var(--space-lg);
  right: var(--space-lg);
  z-index: 50;
  font-family: 'DM Sans', sans-serif;
  font-size: var(--text-ui);
  color: var(--text-muted);
  text-decoration: none;
  padding: 0.375rem 0.875rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
  opacity: 0;
  pointer-events: none;
  transform: translateY(8px);
  transition: opacity 0.2s ease, transform 0.2s ease, color 0.15s ease, border-color 0.15s ease;
}
.back-to-top.visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}
.back-to-top:hover {
  color: var(--text-strong);
  border-color: var(--border-hover);
}

/* --- Responsive --- */
@media (max-width: 640px) {
  .container { padding: var(--space-md) var(--space-md) var(--space-2xl); }
  .stat-row { grid-template-columns: 1fr; }
  .entry-header { gap: var(--space-xs); }
  .info-table td:first-child { white-space: normal; }
}