:root {
  color-scheme: light dark;
  --bg: canvas;
  --fg: canvastext;
  --muted: color-mix(in oklab, canvastext 55%, canvas);
  --border: color-mix(in oklab, canvastext 16%, canvas);
  --card: color-mix(in oklab, canvas 94%, canvastext 6%);
  --primary: #2563eb;
  --primary-fg: #fff;
  --danger: #b91c1c;
  --danger-bg: color-mix(in oklab, var(--danger) 12%, canvas);
  --ok-bg: color-mix(in oklab, #15803d 14%, canvas);
  --err-bg: color-mix(in oklab, var(--danger) 12%, canvas);
  font-family: system-ui, -apple-system, 'Segoe UI', sans-serif;
  line-height: 1.5;
}

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

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--fg);
}

a {
  color: inherit;
}

.app-header {
  border-bottom: 1px solid var(--border);
  padding: 0.75rem 1.25rem;
  background: var(--card);
}

.app-title {
  margin: 0;
  font-size: 1.15rem;
  font-weight: 650;
}

.app-title a {
  text-decoration: none;
}

.app-title a:hover {
  text-decoration: underline;
}

.app-main {
  max-width: 42rem;
  margin: 0 auto;
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.card {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1rem 1.15rem;
  background: var(--card);
}

.card--danger-zone {
  border-color: color-mix(in oklab, var(--danger) 35%, var(--border));
  background: var(--danger-bg);
}

.section-title {
  margin: 0 0 0.75rem;
  font-size: 1.05rem;
}

.muted {
  color: var(--muted);
  font-weight: 400;
}

.small {
  font-size: 0.85rem;
}

.breadcrumb {
  margin: 0;
}

.breadcrumb a {
  color: var(--muted);
}

.banner {
  margin: 0;
  padding: 0.65rem 0.85rem;
  border-radius: 8px;
  font-size: 0.95rem;
}

.banner--ok {
  background: var(--ok-bg);
  border: 1px solid color-mix(in oklab, #15803d 35%, var(--border));
}

.banner--err {
  background: var(--err-bg);
  border: 1px solid color-mix(in oklab, var(--danger) 35%, var(--border));
}

.stack {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.label {
  font-size: 0.9rem;
  font-weight: 600;
}

.textarea {
  width: 100%;
  resize: vertical;
  min-height: 6rem;
  padding: 0.55rem 0.65rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  font: inherit;
  background: var(--bg);
  color: var(--fg);
}

.row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.45rem 0.85rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  font: inherit;
  font-size: 0.9rem;
  cursor: pointer;
  text-decoration: none;
  background: var(--bg);
  color: var(--fg);
}

.btn--primary {
  background: var(--primary);
  color: var(--primary-fg);
  border-color: color-mix(in oklab, var(--primary) 70%, #000);
}

.btn--ghost {
  background: transparent;
}

.btn--danger {
  background: var(--danger);
  color: #fff;
  border-color: color-mix(in oklab, var(--danger) 80%, #000);
}

.btn--danger-outline {
  border-color: color-mix(in oklab, var(--danger) 45%, var(--border));
  color: var(--danger);
  background: transparent;
}

.btn--danger-outline:hover {
  background: var(--danger-bg);
}

.sep {
  border: none;
  border-top: 1px solid var(--border);
  margin: 1rem 0;
}

.empty {
  margin: 0;
  color: var(--muted);
}

.post-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.post-item {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.75rem 0.85rem;
  background: var(--bg);
}

.post-meta {
  display: flex;
  gap: 0.65rem;
  align-items: baseline;
  font-size: 0.8rem;
  color: var(--muted);
  margin-bottom: 0.35rem;
}

.post-id {
  font-weight: 600;
  color: var(--fg);
}

.post-body {
  margin: 0 0 0.65rem;
  white-space: pre-wrap;
  word-break: break-word;
}

.post-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.post-preview {
  margin: 0.75rem 0 1rem;
  padding: 0.65rem 0.75rem;
  border-radius: 8px;
  border: 1px dashed var(--border);
  background: var(--bg);
}