:root {
  --ink: #182129;
  --ink-soft: #56646c;
  --paper: #eef1ef;
  --paper-card: #e4e8e5;
  --paper-raised: #ffffff;
  --accent: #b84e1b;
  --accent-cyan: #196e77;
  --line: rgba(24, 33, 41, 0.14);
  --err: #9a3324;
  --err-bg: #fbeceA;
  --ok: #1e6e4a;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", "Cascadia Code", Consolas, monospace;
}
@media (prefers-color-scheme: dark) {
  :root {
    --ink: #dce6ea;
    --ink-soft: #93a6ae;
    --paper: #0d1820;
    --paper-card: #122029;
    --paper-raised: #16232c;
    --accent: #e68a4c;
    --accent-cyan: #5fc2cc;
    --line: rgba(220, 230, 234, 0.16);
    --err: #e07a63;
    --err-bg: #2a1712;
    --ok: #5fbe8f;
  }
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.5;
}
a { color: var(--accent-cyan); }

header.app-bar {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem 1.3rem;
  border-bottom: 1px solid var(--line);
  flex-wrap: wrap;
}
header.app-bar .brand {
  font-family: var(--font-mono);
  font-weight: 700;
  letter-spacing: -0.01em;
  font-size: 1.05rem;
  text-decoration: none;
  color: var(--ink);
}
header.app-bar .brand span { color: var(--accent); }
header.app-bar .tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--ink-soft);
}
header.app-bar .app-nav a {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  text-decoration: none;
}
header.app-bar .app-nav a:hover { text-decoration: underline; }

main { padding: 1.2rem; max-width: 1400px; margin: 0 auto; }

.editor-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.2rem;
  align-items: start;
}
@media (max-width: 880px) { .editor-grid { grid-template-columns: 1fr; } }

.panel {
  background: var(--paper-raised);
  border: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  min-height: 480px;
}
.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.55rem 0.9rem;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

textarea#code {
  flex: 1;
  border: none;
  outline: none;
  resize: none;
  padding: 0.9rem;
  font-family: var(--font-mono);
  font-size: 0.86rem;
  background: transparent;
  color: var(--ink);
  min-height: 420px;
}

.meta-fields {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding: 0.7rem 0.9rem;
  border-top: 1px solid var(--line);
}
.meta-fields input, .meta-fields select {
  width: 100%;
  font-family: var(--font-body);
  font-size: 0.85rem;
  padding: 0.4rem 0.55rem;
  border: 1px solid var(--line);
  background: var(--paper);
  color: var(--ink);
}

.preview-body {
  flex: 1;
  padding: 1rem;
  overflow: auto;
  display: flex;
  align-items: center;
  justify-content: center;
}
.preview-body svg { max-width: 100%; height: auto; }
.preview-empty { color: var(--ink-soft); font-family: var(--font-mono); font-size: 0.82rem; text-align: center; }

.error-banner {
  margin: 0;
  padding: 0.65rem 0.9rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  background: var(--err-bg);
  color: var(--err);
  border-top: 1px solid var(--line);
  white-space: pre-wrap;
  display: none;
}
.error-banner.visible { display: block; }

.actions {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  padding: 0.7rem 0.9rem;
  border-top: 1px solid var(--line);
}
button {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.03em;
  padding: 0.5rem 1rem;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: #fff;
  cursor: pointer;
}
button:hover { filter: brightness(1.08); }
button:disabled { opacity: 0.45; cursor: not-allowed; }
button.secondary {
  background: transparent;
  color: var(--accent-cyan);
  border-color: var(--accent-cyan);
}
.status-dot {
  width: 8px; height: 8px; border-radius: 50%;
  display: inline-block; margin-right: 0.4rem;
  background: var(--ink-soft);
}
.status-dot.ok { background: var(--ok); }
.status-dot.bad { background: var(--err); }
.status-text { font-family: var(--font-mono); font-size: 0.75rem; color: var(--ink-soft); }

.view-wrap { max-width: 900px; margin: 0 auto; }
.view-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.4rem;
}
.view-head h1 { font-size: 1.3rem; margin: 0; }
.view-actions {
  display: flex;
  align-items: stretch;
  justify-content: flex-end;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.view-actions button {
  min-height: 2.25rem;
  white-space: nowrap;
}
.view-meta {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--ink-soft);
  margin-bottom: 0.6rem;
}
.view-diagram {
  background: var(--paper-raised);
  border: 1px solid var(--line);
  padding: 1.5rem;
  display: flex;
  justify-content: center;
  min-height: 200px;
  align-items: center;
  overflow: auto;
}
.view-diagram svg { max-width: 100%; height: auto; }
.not-found { text-align: center; padding: 4rem 1rem; color: var(--ink-soft); }

.badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 0.15em 0.55em;
  border: 1px solid var(--accent-cyan);
  color: var(--accent-cyan);
}
.badge.exposure-public { border-color: var(--ok); color: var(--ok); }
.tag-pill {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 0.1em 0.5em;
  background: var(--paper-card);
  border: 1px solid var(--line);
  color: var(--ink-soft);
}
.pill-row { display: flex; flex-wrap: wrap; gap: 0.35rem; align-items: center; margin-top: 0.5rem; }

.recent-list { display: flex; flex-direction: column; gap: 0.7rem; }
.recent-item {
  background: var(--paper-raised);
  border: 1px solid var(--line);
  padding: 0.8rem 1rem;
}
.recent-item h3 { margin: 0 0 0.35rem; font-size: 1rem; }
.recent-item h3 a { text-decoration: none; color: var(--ink); }
.recent-item h3 a:hover { color: var(--accent-cyan); }
.recent-meta { font-family: var(--font-mono); font-size: 0.72rem; color: var(--ink-soft); margin-bottom: 0.35rem; }

@media (max-width: 640px) {
  .view-head {
    align-items: stretch;
  }
  .view-head h1,
  .view-actions {
    width: 100%;
  }
  .view-actions {
    display: grid;
    grid-template-columns: 1fr;
  }
  .view-actions button {
    width: 100%;
  }
  .view-diagram {
    padding: 0.75rem;
  }
}