:root {
  --bg: #0d1117;
  --panel: #161b22;
  --ink: #e6edf3;
  --muted: #9aa7b2;
  --brand: #0C6B57;
  --brand-ink: #d7f5ec;
  --line: #232b34;
}
* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  display: flex;
  flex-direction: column;
}
.bar {
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
  padding: 14px 18px; border-bottom: 1px solid var(--line); background: var(--panel);
}
.wordmark { font-weight: 700; letter-spacing: .2px; }
.mark {
  display: inline-grid; place-items: center; width: 24px; height: 24px;
  background: var(--brand); color: #fff; border-radius: 6px; font-size: 14px; margin-right: 4px;
}
.ai-tag { color: var(--muted); font-size: 13px; }
.chat {
  flex: 1; overflow-y: auto; padding: 22px 18px;
  display: flex; flex-direction: column; gap: 14px;
  max-width: 760px; width: 100%; margin: 0 auto;
}
.msg { padding: 12px 15px; border-radius: 14px; max-width: 88%; white-space: pre-wrap; word-wrap: break-word; }
.msg.ai { background: var(--panel); border: 1px solid var(--line); border-bottom-left-radius: 4px; align-self: flex-start; }
.msg.me { background: var(--brand); color: var(--brand-ink); border-bottom-right-radius: 4px; align-self: flex-end; }
.msg p { margin: 0; }
.loading::after { content: ""; animation: dots 1.2s steps(4, end) infinite; }
@keyframes dots { 0% { content: ""; } 25% { content: "."; } 50% { content: ".."; } 75% { content: "..."; } }
.composer {
  display: flex; gap: 10px; padding: 14px 18px; border-top: 1px solid var(--line);
  background: var(--panel); max-width: 760px; width: 100%; margin: 0 auto;
}
#input {
  flex: 1; padding: 12px 14px; border-radius: 10px; border: 1px solid var(--line);
  background: var(--bg); color: var(--ink); font-size: 15px;
}
#input:focus { outline: 2px solid var(--brand); outline-offset: 0; }
#send {
  padding: 0 18px; border: 0; border-radius: 10px; background: var(--brand); color: #fff;
  font-weight: 600; cursor: pointer;
}
#send:disabled { opacity: .5; cursor: default; }
.foot {
  padding: 12px 18px; color: var(--muted); font-size: 12.5px; text-align: center;
  border-top: 1px solid var(--line); max-width: 760px; width: 100%; margin: 0 auto;
}
.foot a { color: var(--brand-ink); }