:root {
  --bg: #ffffff; --bg2: #f7f7f8; --bg3: #ececf1; --fg: #1f2328; --muted: #6b7280; --line: #e5e7eb;
  --accent: #10a37f; --accent-fg: #fff; --user-bg: #f0f1f3; --danger: #d92d20; --warn-bg: #fff4e5; --warn-fg: #b45309;
  --noise: #c2410c; --shadow: 0 2px 12px rgba(0,0,0,.08);
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #212121; --bg2: #171717; --bg3: #2f2f2f; --fg: #ececec; --muted: #9ca3af; --line: #3a3a3a;
    --accent: #19c37d; --accent-fg: #06130d; --user-bg: #2f2f2f; --danger: #f97066; --warn-bg: #3b2a10; --warn-fg: #fbbf24;
    --noise: #fb923c; --shadow: 0 2px 12px rgba(0,0,0,.5);
  }
}
* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body {
  background: var(--bg); color: var(--fg);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Roboto, sans-serif;
  -webkit-text-size-adjust: 100%;
}
button, input, textarea, select { font: inherit; color: inherit; }
button { cursor: pointer; }
a { color: var(--accent); }
.hidden { display: none !important; }

/* ----- buttons / inputs ----- */
.btn {
  border: 1px solid var(--line); background: var(--bg); border-radius: 10px; padding: 8px 14px; line-height: 1.2;
  transition: background .15s;
}
.btn:hover { background: var(--bg3); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-fg); font-weight: 600; }
.btn.primary:hover { filter: brightness(.95); }
.btn.danger { color: var(--danger); }
.btn.sm { padding: 5px 10px; font-size: 13px; border-radius: 8px; }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.input {
  width: 100%; border: 1px solid var(--line); background: var(--bg); border-radius: 10px; padding: 10px 12px; outline: none;
}
.input:focus { border-color: var(--accent); }

/* ----- markdown ----- */
.md > :first-child { margin-top: 0; }
.md > :last-child { margin-bottom: 0; }
.md p { margin: .6em 0; }
.md h1, .md h2, .md h3, .md h4, .md h5, .md h6 { margin: 1.1em 0 .4em; line-height: 1.35; }
.md h1 { font-size: 1.4em; } .md h2 { font-size: 1.25em; } .md h3 { font-size: 1.1em; } .md h4, .md h5, .md h6 { font-size: 1em; }
.md ul, .md ol { margin: .5em 0; padding-left: 1.5em; }
.md li { margin: .15em 0; }
.md code { background: var(--bg3); padding: .12em .4em; border-radius: 5px; font: .88em ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
.md .code { margin: .8em 0; border-radius: 10px; overflow: hidden; background: #0f1115; color: #e6e6e6; }
.md .code-h { display: flex; justify-content: space-between; align-items: center; padding: 6px 12px; background: #1d2027; font-size: 12px; color: #a0a6b1; }
.md .code-h .copy { background: none; border: 0; color: inherit; padding: 2px 6px; }
.md .code-h .copy:hover { color: #fff; }
.md .code pre { margin: 0; padding: 12px 14px; overflow-x: auto; }
.md .code code { background: none; padding: 0; color: inherit; font-size: 13.5px; line-height: 1.55; }
.md blockquote { margin: .7em 0; padding: .1em 1em; border-left: 3px solid var(--line); color: var(--muted); }
.md hr { border: 0; border-top: 1px solid var(--line); margin: 1em 0; }
.md .tbl { overflow-x: auto; margin: .7em 0; }
.md table { border-collapse: collapse; font-size: .95em; }
.md th, .md td { border: 1px solid var(--line); padding: 6px 10px; }
.md th { background: var(--bg2); }
.md a { word-break: break-all; }

/* diffusion */
.diffusing { white-space: pre-wrap; word-break: break-word; }
.diffusing .n { color: var(--noise); }
.diffusing .s { color: var(--fg); }
.fade-in { animation: fadeIn .35s ease; }
@keyframes fadeIn { from { opacity: .35; } to { opacity: 1; } }

.tag {
  display: inline-block; font-size: 12px; line-height: 1; padding: 4px 8px; border-radius: 999px; vertical-align: middle;
  background: var(--warn-bg); color: var(--warn-fg); white-space: nowrap;
}
.tag.red { background: rgba(217,45,32,.12); color: var(--danger); }
.tag.green { background: rgba(16,163,127,.14); color: var(--accent); }