:root {
  --bg: #0b0b0c;
  --panel: #141416;
  --ink: #e8e6e3;
  --muted: #8a8680;
  --accent: #c45c26;
  --bot: #1c1c1f;
  --user: #222228;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  background: radial-gradient(1200px 600px at 50% -10%, #1a1210, var(--bg));
  color: var(--ink);
  font-family: "Pretendard", "Noto Sans KR", system-ui, sans-serif;
}
.app {
  max-width: 720px;
  margin: 0 auto;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  padding: 1.25rem;
}
header {
  display: flex;
  gap: 0.9rem;
  align-items: center;
  padding-bottom: 1rem;
  border-bottom: 1px solid #2a2a2e;
}
.mark {
  width: 3rem; height: 3rem;
  border-radius: 0.75rem;
  display: grid; place-items: center;
  background: linear-gradient(145deg, #3a1d12, #c45c26);
  font-weight: 800;
  font-size: 1.4rem;
}
h1 { margin: 0; font-size: 1.15rem; letter-spacing: 0.02em; }
.sub { margin: 0.2rem 0 0; color: var(--muted); font-size: 0.85rem; }
#log {
  flex: 1;
  overflow-y: auto;
  padding: 1rem 0;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
.bubble {
  max-width: 85%;
  padding: 0.75rem 0.95rem;
  border-radius: 1rem;
  line-height: 1.45;
  white-space: pre-wrap;
  word-break: break-word;
}
.bubble.bot { align-self: flex-start; background: var(--bot); border: 1px solid #2e2e33; }
.bubble.user { align-self: flex-end; background: var(--user); border: 1px solid #3a3a42; }
.bubble.err { border-color: #7a2e2e; color: #ffb4b4; }
#form {
  display: flex;
  gap: 0.5rem;
  padding-top: 0.75rem;
  border-top: 1px solid #2a2a2e;
}
#input {
  flex: 1;
  background: var(--panel);
  border: 1px solid #333;
  color: var(--ink);
  border-radius: 0.75rem;
  padding: 0.85rem 1rem;
  font-size: 1rem;
}
#input:focus { outline: 1px solid var(--accent); }
button {
  background: var(--accent);
  color: #fff;
  border: 0;
  border-radius: 0.75rem;
  padding: 0 1.1rem;
  font-weight: 700;
  cursor: pointer;
}
button:disabled { opacity: 0.5; cursor: wait; }
.hint { color: var(--muted); font-size: 0.75rem; margin: 0.5rem 0 0; }
code { color: #cfc8c0; }

.state {
  color: var(--muted);
  font-size: 0.8rem;
  margin: 0.5rem 0 0.75rem;
  font-variant-numeric: tabular-nums;
}