:root {
  --bg: #f7f8fa;
  --fg: #14171a;
  --muted: #657786;
  --border: #e1e8ed;
  --primary: #1d9bf0;
  --primary-fg: #fff;
  --danger: #d3304b;
  --warning: #b97a00;
  --card: #fff;
  --radius: 10px;
}

* { box-sizing: border-box; }
html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 15px;
  line-height: 1.4;
}
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 20px;
  background: var(--card);
  border-bottom: 1px solid var(--border);
}
.brand { font-weight: 700; font-size: 20px; color: var(--fg); }
.nav { display: flex; gap: 16px; align-items: center; }
.nav a, .nav .linklike { color: var(--fg); }
.nav a.teacher { color: var(--danger); font-weight: 600; }
.linklike {
  background: none; border: none; cursor: pointer; padding: 0;
  color: inherit; font: inherit; text-decoration: none;
}

.page {
  max-width: 720px;
  margin: 24px auto;
  padding: 0 16px;
}
section.card, .card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 16px;
}
.row { display: flex; gap: 12px; align-items: center; }
.row.right { justify-content: flex-end; }
.row.gap { gap: 16px; }

.muted { color: var(--muted); }
.small { font-size: 13px; }

.btn {
  display: inline-block;
  padding: 8px 14px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--fg);
  font-weight: 600;
  cursor: pointer;
  font-size: 14px;
}
.btn.primary { background: var(--primary); color: var(--primary-fg); border-color: var(--primary); }
.btn.danger { background: var(--danger); color: #fff; border-color: var(--danger); }
.btn.small { padding: 4px 10px; font-size: 13px; }

.composer textarea, .composer input[type=text] {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 10px;
  font: inherit;
  resize: vertical;
}
.composer textarea { min-height: 60px; }
.composer { display: flex; flex-direction: column; gap: 10px; }
.inline-form { display: inline-flex; gap: 8px; align-items: center; margin-right: 12px; }

.avatar {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  color: #fff;
  font-weight: 700;
  text-align: center;
  position: relative;
  flex-shrink: 0;
}
.avatar .bot-badge {
  position: absolute;
  bottom: -2px; right: -2px;
  background: var(--danger);
  color: #fff;
  font-size: 10px;
  width: 16px; height: 16px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1.5px solid var(--card);
}

.post .body, .comment .body { margin: 8px 0 6px; white-space: pre-wrap; word-wrap: break-word; }
.post-link { color: var(--fg); }
.handle { font-weight: 600; }
.meta { display: flex; gap: 6px; align-items: baseline; }

.reactions { display: flex; gap: 6px; flex-wrap: wrap; }
.post-actions { gap: 8px; align-items: center; flex-wrap: wrap; margin-top: 6px; }
.repost-banner { padding-bottom: 4px; border-bottom: 1px dashed var(--border); margin-bottom: 8px; }
.reposters { margin-top: 4px; }
.rxn-form { margin: 0; }
.rxn {
  border: 1px solid var(--border);
  border-radius: 999px;
  background: transparent;
  padding: 4px 10px;
  cursor: pointer;
  font-size: 14px;
}
.rxn.on { background: #fff3f7; border-color: #ffb3c8; }
.reactors { margin-top: 6px; }

.knobs {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-top: 12px;
}
.knobs label { display: flex; flex-direction: column; gap: 4px; font-size: 13px; }
.knobs input[type=range] { width: 100%; }

.spend-meter .bar {
  background: #eee;
  border-radius: 999px;
  height: 8px;
  overflow: hidden;
  margin-top: 4px;
}
.spend-meter .fill { background: var(--primary); height: 100%; }
.spend-meter .warning {
  margin-top: 8px;
  color: var(--warning);
  font-weight: 600;
}

.grid {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}
.grid th, .grid td {
  text-align: left;
  padding: 6px 8px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
.grid.small { font-size: 13px; }
.safety-fail { background: #fff5f5; }
.safety-skipped { color: var(--muted); }
.preview-panel {
  background: #fff8d6;
  border: 1px solid #f0e08a;
  border-radius: 6px;
  padding: 8px;
  margin: 6px 0;
}
.danger-zone {
  border: 2px solid var(--danger);
  background: #fff5f5;
}
.danger-zone .inline-form { margin-top: 8px; }

.login-card {
  max-width: 400px;
  margin: 60px auto;
  padding: 32px;
  text-align: center;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}