/* =============================================================================
   B3Chain — shared stylesheet
   Used by every page on b3chain.org. Light theme, plain HTML, no JS framework.
   ============================================================================= */

:root {
  --bg:           #fff;
  --panel:        #fafafa;
  --text:         #1a1a1a;
  --muted:        #555;
  --line:         #ddd;
  --accent:       #1a1a1a;
  --warn-bg:      #f9f6ee;
  --warn-border:  #d4c9a8;
  --pass:         #1a7a3a;
  --fail:         #a02020;
  --pending:      #b07a18;
  --skip:         #777;
  --code-bg:      #f5f5f5;
  --inline-bg:    #f0f0f0;
  --mono:         ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas,
                   "Liberation Mono", "Courier New", monospace;
  --sans:         ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto,
                   Helvetica, Arial;
}

* { box-sizing: border-box }

body {
  margin: 0;
  font-family: var(--sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

.wrap { max-width: 920px; margin: 0 auto; padding: 28px 18px 56px }
.wrap-wide { max-width: 1100px; margin: 0 auto; padding: 28px 18px 56px }

/* ----- Panels & layout primitives ----- */
header, section, aside, .card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  padding: 18px;
}

.content { margin-top: 18px; display: flex; flex-direction: column; gap: 16px }

/* ----- Navigation breadcrumb ----- */
.nav { font-size: 13px; color: var(--muted); margin-bottom: 14px }
.nav a { color: var(--accent); text-decoration: none }
.nav a:hover { text-decoration: underline }

/* ----- Headings ----- */
h1 { margin: 0; font-size: 28px }
h2 { margin: 0 0 10px; font-size: 18px }
h3 { margin: 16px 0 8px; font-size: 15px; font-weight: 600 }
.subtitle { color: var(--muted); margin-top: 8px; max-width: 72ch }

p { margin: 8px 0 }
a { color: var(--accent) }

/* ----- Anchors on headings ----- */
.anchor { color: var(--muted); text-decoration: none; margin-left: 4px; opacity: 0 }
h2:hover .anchor, h3:hover .anchor { opacity: .5 }
.anchor:hover { opacity: 1 !important }

/* ----- Lists ----- */
ul { margin: 8px 0 0 18px }
li { margin: 5px 0 }
ol { margin: 8px 0 0 22px }
.toc { margin: 12px 0 0 18px }
.toc li { margin: 4px 0 }
.toc a { text-decoration: none; font-size: 14px }
.toc a:hover { text-decoration: underline }

/* ----- Code blocks ----- */
pre {
  font-family: var(--mono);
  font-size: 12.5px;
  padding: 14px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: var(--code-bg);
  margin: 10px 0 0;
  overflow-x: auto;
  line-height: 1.45;
  white-space: pre;
  word-wrap: normal;
}
code {
  font-family: var(--mono);
  font-size: 13px;
  background: var(--inline-bg);
  padding: 2px 5px;
  border-radius: 3px;
}

/* ----- Tables ----- */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 10px 0 0;
  font-size: 13.5px;
}
th {
  text-align: left;
  padding: 8px 10px;
  border-bottom: 2px solid var(--line);
  font-weight: 600;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: .04em;
  color: var(--muted);
}
td {
  padding: 7px 10px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}
tr:last-child td { border-bottom: none }
.hash { font-family: var(--mono); font-size: 11.5px; word-break: break-all }

/* ----- Pills, badges, status tags ----- */
.pill {
  display: inline-block;
  border: 1px solid var(--line);
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 12px;
  color: var(--muted);
  margin: 2px 4px 2px 0;
}
.pill b { color: var(--text) }

.status-pass    { color: var(--pass);    font-weight: 600 }
.status-fail    { color: var(--fail);    font-weight: 600 }
.status-pending { color: var(--pending); font-weight: 600 }
.status-skip    { color: var(--skip);    font-weight: 600 }
.pass { color: var(--pass); font-weight: 600 }
.fail { color: var(--fail); font-weight: 600 }

.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .05em;
}
.badge-pass    { background: #e0f0e0; color: var(--pass) }
.badge-fail    { background: #f0e0e0; color: var(--fail) }
.badge-pending { background: #f5ecd6; color: var(--pending) }
.badge-skip    { background: #e8e8e8; color: var(--skip) }

/* ----- Warning / notice box ----- */
.warn {
  border: 1px solid var(--warn-border);
  background: var(--warn-bg);
  padding: 12px;
  border-radius: 8px;
  margin-top: 12px;
  font-size: 14px;
}
.warn b { display: block; margin-bottom: 4px }

/* ----- Key/value definition list ----- */
.kvs {
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: 6px 12px;
  margin-top: 10px;
  font-size: 14px;
}
.kvs div { padding: 5px 0; border-bottom: 1px dashed var(--line) }

/* ----- Card grid (used on hub pages) ----- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 14px;
  margin-top: 12px;
}
.card-grid .card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  text-decoration: none;
  color: var(--text);
  transition: border-color .15s, transform .15s;
}
.card-grid .card:hover {
  border-color: var(--accent);
  transform: translateY(-1px);
}
.card-grid .card h3 { margin: 0; font-size: 15px; font-weight: 600 }
.card-grid .card .desc { color: var(--muted); font-size: 13px; flex: 1 }
.card-grid .card .meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  color: var(--muted);
}

/* ----- Two-column main layout (homepage) ----- */
main.split {
  margin-top: 18px;
  display: grid;
  grid-template-columns: 1.3fr .7fr;
  gap: 16px;
}
@media (max-width: 860px) { main.split { grid-template-columns: 1fr } }

/* ----- Sidebar grid (testing hub) ----- */
.sidebar { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 0 }
@media (max-width: 680px) { .sidebar { grid-template-columns: 1fr } }

/* ----- Tagrow (header pills) ----- */
.tagrow { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 10px }

/* ----- Misc ----- */
.muted        { color: var(--muted) }
.small        { font-size: 13px; color: var(--muted) }
.canonical    { font-size: 12px; color: var(--muted); margin-top: 14px;
                padding-top: 12px; border-top: 1px solid var(--line) }
.hr           { height: 1px; background: var(--line); margin: 14px 0 }
footer        { margin-top: 18px; color: var(--muted); font-size: 13px }
.copy-btn {
  display: inline-block;
  margin-top: 6px;
  padding: 5px 12px;
  font-size: 12px;
  font-family: var(--mono);
  border: 1px solid var(--line);
  border-radius: 5px;
  background: var(--panel);
  color: var(--muted);
  cursor: pointer;
  user-select: none;
}
.copy-btn:hover { background: #eee; color: var(--text) }

/* ----- Prev/next page navigation ----- */
.page-nav {
  display: flex;
  justify-content: space-between;
  margin-top: 18px;
  font-size: 14px;
  gap: 10px;
}
.page-nav a {
  flex: 1;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  text-decoration: none;
  color: var(--text);
}
.page-nav a:hover { border-color: var(--accent) }
.page-nav .prev::before { content: "← "; color: var(--muted) }
.page-nav .next { text-align: right }
.page-nav .next::after { content: " →"; color: var(--muted) }

/* ----- Diagram / mermaid placeholder ----- */
.diagram {
  text-align: center;
  padding: 18px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  margin: 12px 0;
}
.diagram pre {
  text-align: left;
  display: inline-block;
  background: transparent;
  border: none;
  padding: 0;
  margin: 0;
}