:root {
  --bg: #0c1016;
  --panel: #121820;
  --panel-2: #1a2230;
  --border: rgba(107, 159, 212, 0.22);
  --text: #e8eaed;
  --muted: #8a939e;
  --accent: #3d6a9e;
  --accent-2: #6b9fd4;
  --mc: #7dcea0;
  --web: #6b9fd4;
  --danger: #e05a5a;
  --font: Inter, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

* { box-sizing: border-box; }
html, body {
  margin: 0;
  min-height: 100%;
  background: radial-gradient(1200px 600px at 20% -10%, #1a2d4a 0%, var(--bg) 55%);
  color: var(--text);
  font-family: var(--font);
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 20px;
  border-bottom: 1px solid var(--border);
  background: rgba(12, 16, 22, 0.88);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 5;
}

.brand { display: flex; align-items: center; gap: 12px; }
.brand-mark {
  width: 40px; height: 40px; border-radius: 10px;
  display: grid; place-items: center;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #0c1016; font-weight: 800;
}
.brand h1 { margin: 0; font-size: 1.15rem; }
.brand p { margin: 2px 0 0; color: var(--muted); font-size: 0.85rem; }

.top-actions { display: flex; gap: 8px; flex-wrap: wrap; }

.btn {
  appearance: none; border: 1px solid var(--border);
  background: var(--panel-2); color: var(--text);
  border-radius: 9px; padding: 8px 12px; font-weight: 600;
  text-decoration: none; cursor: pointer;
}
.btn.primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #0c1016; border-color: transparent;
}
.btn.ghost:hover { border-color: var(--accent-2); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

.chat-shell {
  max-width: 920px;
  margin: 0 auto;
  min-height: calc(100vh - 74px);
  display: flex;
  flex-direction: column;
  padding: 16px;
  gap: 12px;
}

.messages {
  flex: 1;
  overflow-y: auto;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: rgba(18, 24, 32, 0.72);
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.msg {
  display: grid;
  grid-template-columns: 40px 1fr;
  gap: 8px 12px;
  padding: 8px 10px;
  border-radius: 10px;
  background: rgba(26, 34, 48, 0.55);
  align-items: start;
}
.msg-avatar {
  width: 40px;
  height: 40px;
  border-radius: 8px;
  image-rendering: pixelated;
  background: rgba(0, 0, 0, 0.35);
  border: 1px solid var(--border);
  object-fit: cover;
}
.msg-avatar.is-loading {
  opacity: 0.45;
}
.msg-body {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.msg-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  color: var(--muted);
  font-size: 0.78rem;
}
.badge {
  display: inline-flex; align-items: center;
  padding: 2px 7px; border-radius: 999px;
  font-weight: 700; font-size: 0.72rem; letter-spacing: 0.02em;
}
.badge-mc { background: rgba(125, 206, 160, 0.18); color: var(--mc); }
.badge-web { background: rgba(107, 159, 212, 0.18); color: var(--web); }
.msg-user { font-weight: 700; color: var(--accent-2); }
.msg-prefix { color: #9ad0ff; margin-right: 4px; }
.msg-text { line-height: 1.45; word-break: break-word; white-space: pre-wrap; }

.composer {
  border: 1px solid var(--border);
  border-radius: 14px;
  background: rgba(18, 24, 32, 0.85);
  padding: 12px;
}
.composer-row { display: flex; gap: 8px; }
.composer input {
  flex: 1; min-width: 0;
  border-radius: 10px; border: 1px solid var(--border);
  background: #0c1016; color: var(--text);
  padding: 12px 14px; font-size: 1rem;
}
.composer input:focus { outline: 1px solid var(--accent-2); }
.readonly-hint { margin: 0 0 10px; color: var(--muted); font-size: 0.9rem; }
.readonly-hint a { color: var(--accent-2); }
.load-more-btn {
  align-self: center;
  margin: 0 0 4px;
  appearance: none;
  border: 1px solid var(--border);
  background: var(--panel-2);
  color: var(--text);
  border-radius: 999px;
  padding: 7px 14px;
  font-weight: 600;
  cursor: pointer;
}
.load-more-btn:hover:not(:disabled) {
  border-color: var(--accent-2);
}
.load-more-btn:disabled {
  opacity: 0.55;
  cursor: wait;
}
.hidden { display: none !important; }
.empty {
  color: var(--muted); text-align: center; padding: 40px 12px; font-size: 0.95rem;
}

@media (max-width: 640px) {
  .brand-mark { display: none; }
  .composer-row { flex-direction: column; }
}