:root {
  --bg: #0f1115; --panel: #161920; --line: #262b36;
  --fg: #e6e8ec; --dim: #8b93a3; --accent: #6ea8fe;
  --user: #1d2432; --ok: #3fb950; --bad: #f85149;
}
* { box-sizing: border-box; }
/* Must outrank the id selectors below, which would otherwise beat the UA
   stylesheet's [hidden]{display:none} and render both panels at once. */
[hidden] { display: none !important; }
html, body { height: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--fg);
  font: 15px/1.55 ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

/* --- gate --- */
#gate { display: grid; place-items: center; height: 100%; }
.gate-card { text-align: center; padding: 2.5rem; max-width: 26rem; }
.gate-card h1 { margin: 0 0 .5rem; font-size: 1.4rem; letter-spacing: -.01em; }
#gate-msg { color: var(--dim); margin: 0 0 1.5rem; }
#unlock {
  font-size: 1rem; padding: .7rem 1.6rem; border-radius: 8px;
  border: 1px solid var(--accent); background: transparent; color: var(--accent);
  cursor: pointer;
}
#unlock:hover { background: rgba(110,168,254,.1); }
#unlock:disabled { opacity: .5; cursor: default; }
.fine { color: var(--dim); font-size: .8rem; margin-top: 2rem; }

/* --- app --- */
#app { display: flex; flex-direction: column; height: 100%; }
header {
  display: flex; align-items: center; gap: .6rem;
  padding: .6rem 1rem; border-bottom: 1px solid var(--line); background: var(--panel);
}
.spacer { flex: 1; }
.dot { width: 9px; height: 9px; border-radius: 50%; background: var(--dim); }
.dot.ok { background: var(--ok); } .dot.bad { background: var(--bad); }
.model { font-weight: 600; font-size: .9rem; }
.badge {
  font-size: .7rem; color: var(--dim); border: 1px solid var(--line);
  padding: .1rem .45rem; border-radius: 999px;
}
header button {
  font-size: .8rem; padding: .3rem .7rem; border-radius: 6px;
  border: 1px solid var(--line); background: transparent; color: var(--dim); cursor: pointer;
}
header button:hover { color: var(--fg); border-color: var(--dim); }

#log { flex: 1; overflow-y: auto; padding: 1.2rem; scroll-behavior: smooth; }
.turn { max-width: 46rem; margin: 0 auto 1.1rem; }
.turn .who { font-size: .7rem; text-transform: uppercase; letter-spacing: .06em; color: var(--dim); margin-bottom: .3rem; }
.turn .body { white-space: pre-wrap; overflow-wrap: anywhere; }
.turn.user .body { background: var(--user); padding: .6rem .8rem; border-radius: 8px; }
details.think {
  margin: 0 0 .5rem; border-left: 2px solid var(--line); padding-left: .7rem; color: var(--dim);
}
details.think summary { cursor: pointer; font-size: .78rem; }
details.think .body { font-size: .85rem; white-space: pre-wrap; }

footer { border-top: 1px solid var(--line); background: var(--panel); padding: .7rem 1rem 1rem; }
#form { display: flex; gap: .6rem; max-width: 46rem; margin: 0 auto; align-items: flex-end; }
#input {
  flex: 1; resize: none; max-height: 11rem; padding: .6rem .7rem;
  border-radius: 8px; border: 1px solid var(--line); background: var(--bg);
  color: var(--fg); font: inherit;
}
#input:focus { outline: none; border-color: var(--accent); }
#send {
  padding: .6rem 1.1rem; border-radius: 8px; border: 1px solid var(--accent);
  background: transparent; color: var(--accent); cursor: pointer; font: inherit;
}
#send:disabled { opacity: .45; cursor: default; }
.hint { max-width: 46rem; margin: .45rem auto 0; color: var(--dim); font-size: .75rem; min-height: 1em; }