:root {
  --bg0: #0f1c17;
  --bg1: #163528;
  --panel: rgba(248, 250, 246, 0.94);
  --ink: #14231c;
  --muted: #5c7268;
  --accent: #1f7a4c;
  --accent-2: #c4f06a;
  --line: rgba(20, 35, 28, 0.12);
  --bot: #e7f2ea;
  --user: #1f7a4c;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  font-family: "Noto Sans SC", "DM Sans", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(1200px 600px at 10% -10%, #2f6b4f 0%, transparent 55%),
    radial-gradient(900px 500px at 100% 0%, #8fd36a 0%, transparent 45%),
    linear-gradient(160deg, var(--bg0), var(--bg1));
}

.page { max-width: 1100px; margin: 0 auto; padding: 32px 20px 48px; }
.hero { color: #f4faf6; margin-bottom: 22px; }
.brand {
  margin: 0 0 8px;
  font-family: "DM Sans", sans-serif;
  letter-spacing: 0.04em;
  font-weight: 700;
  font-size: 14px;
  color: var(--accent-2);
}
.hero h1 {
  margin: 0 0 10px;
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  line-height: 1.25;
  font-weight: 700;
}
.sub { margin: 0; max-width: 52rem; color: rgba(244, 250, 246, 0.82); }
.sub code {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.9em;
  background: rgba(0,0,0,0.25);
  padding: 0.1em 0.35em;
  border-radius: 4px;
}

.layout {
  display: grid;
  grid-template-columns: 1.4fr 0.9fr;
  gap: 16px;
}
@media (max-width: 860px) {
  .layout { grid-template-columns: 1fr; }
}

.panel {
  background: var(--panel);
  border-radius: 18px;
  border: 1px solid rgba(255,255,255,0.35);
  box-shadow: 0 18px 50px rgba(0,0,0,0.22);
}

.chat { display: flex; flex-direction: column; min-height: 560px; overflow: hidden; }
.log {
  flex: 1;
  padding: 18px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.bubble {
  max-width: 92%;
  padding: 10px 12px;
  border-radius: 12px;
  white-space: pre-wrap;
  line-height: 1.5;
  font-size: 14px;
}
.bubble.bot { align-self: flex-start; background: var(--bot); }
.bubble.user { align-self: flex-end; background: var(--user); color: #fff; }
.bubble.sys { align-self: center; background: transparent; color: var(--muted); font-size: 12px; }

.composer {
  display: flex;
  gap: 8px;
  padding: 12px 14px;
  border-top: 1px solid var(--line);
}
.composer input {
  flex: 1;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 12px 14px;
  font: inherit;
}
.composer button, .ghost {
  border: 0;
  border-radius: 10px;
  padding: 12px 16px;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  background: var(--accent);
  color: #fff;
}
.ghost {
  background: transparent;
  color: var(--accent);
  border: 1px solid var(--line);
  padding: 8px 12px;
}
.toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 0 14px 14px;
}
.meta { color: var(--muted); font-size: 12px; }

.side { padding: 16px 18px 20px; }
.side h2 {
  margin: 12px 0 8px;
  font-size: 13px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
}
.side h2:first-child { margin-top: 0; }
.side pre {
  margin: 0;
  padding: 12px;
  background: #eef5f0;
  border-radius: 10px;
  font-size: 12px;
  line-height: 1.45;
  overflow: auto;
  max-height: 220px;
}