/* The demo page (demo plan U4): two columns side by side, stacked on narrow screens; light and dark. */

:root {
  --bg: #f6f7f9;
  --card: #ffffff;
  --text: #1b1f24;
  --muted: #5d6673;
  --line: #dde1e6;
  --accent: #3355d1;
  --user: #eef2ff;
  --code: #f1f3f5;
  --error: #b42318;
  --error-bg: #fef3f2;
  --ok: #067647;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111418;
    --card: #1a1e24;
    --text: #e6e8eb;
    --muted: #9aa3ae;
    --line: #2d333b;
    --accent: #7c9bff;
    --user: #1f2740;
    --code: #0d1014;
    --error: #ff8a80;
    --error-bg: #2a1614;
    --ok: #4ade80;
  }
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif;
}

.top {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
  background: var(--card);
}

.top h1 { margin: 0; font-size: 18px; }
.top h1 span { color: var(--muted); font-weight: 400; font-size: 15px; margin-left: 6px; }
nav { display: flex; gap: 6px; }
.tab[aria-selected="true"] { border-color: var(--accent); color: var(--accent); }

.notice {
  margin: 0;
  padding: 8px 16px;
  font-size: 13px;
  color: var(--muted);
  border-bottom: 1px solid var(--line);
}

main { padding: 16px; max-width: 1400px; margin: 0 auto; }

footer { padding: 12px 16px 24px; text-align: center; font-size: 13px; color: var(--muted); }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 16px;
}

button, .button {
  font: inherit;
  padding: 6px 12px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--card);
  color: var(--text);
  cursor: pointer;
}
button:disabled { opacity: 0.5; cursor: default; }
button.primary { background: var(--accent); border-color: var(--accent); color: #fff; }

input, textarea {
  font: inherit;
  width: 100%;
  padding: 8px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--bg);
  color: var(--text);
}
textarea { resize: vertical; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 14px; }

.sign-in { max-width: 460px; margin: 48px auto; }
.sign-in form { display: grid; gap: 8px; }

.message { color: var(--error); font-size: 14px; }
.metrics .warning { color: var(--error); background: var(--error-bg); border-radius: 6px; padding: 6px 10px; margin: 0 0 6px; }
.message:empty { display: none; }
.hint { color: var(--muted); font-size: 13px; margin: 2px 0; }
.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); }

/* the chat */

/* the two columns share one header row (subgrid), so a taller header on one side keeps both conversations level */
.columns { display: grid; grid-template-columns: 1fr 1fr; grid-template-rows: auto 1fr; gap: 0 16px; }

.column {
  display: grid;
  grid-template-rows: subgrid;
  grid-row: span 2;
  min-width: 0;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 8px;
}
.column > header { padding: 12px 16px; border-bottom: 1px solid var(--line); }
.column h2 { margin: 0 0 4px; font-size: 15px; }
.facts { display: flex; flex-wrap: wrap; gap: 4px 12px; margin: 0; padding: 0; list-style: none;
  font-size: 12px; color: var(--muted); }
.facts .model { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }
.facts .price { flex-basis: 100%; }

.log { padding: 12px 16px; min-height: 240px; max-height: 65vh; overflow-y: auto; }
.empty { color: var(--muted); }

.user { background: var(--user); border-radius: 8px; padding: 8px 12px; margin: 12px 0 8px; }
.user p { margin: 0; white-space: pre-wrap; overflow-wrap: anywhere; }
.user img, .attachments img { max-width: 120px; max-height: 90px; border-radius: 4px; margin: 4px 4px 0 0; }

.answer .waiting { color: var(--muted); }
.reasoning { margin-bottom: 8px; color: var(--muted); font-size: 13px; }
.reasoning summary { cursor: pointer; }

/* answers and reasoning, rendered from markdown (markdown.js) */

.answer .text { overflow-wrap: anywhere; }
.answer .text > :first-child { margin-top: 0; }
.answer .text p { margin: 0 0 8px; }
.answer .text h1, .answer .text h2, .answer .text h3,
.answer .text h4, .answer .text h5, .answer .text h6 { margin: 14px 0 6px; line-height: 1.3; font-weight: 600; }
.answer .text h1 { font-size: 1.25em; }
.answer .text h2 { font-size: 1.15em; }
.answer .text h3 { font-size: 1.05em; }
.answer .text h4, .answer .text h5, .answer .text h6 { font-size: 1em; }
.answer .text ul, .answer .text ol { margin: 0 0 8px; padding-left: 22px; }
.answer .text li { margin: 2px 0; }
.answer .text li > p { margin: 0; }
.answer .text li > ul, .answer .text li > ol { margin: 2px 0 0; }
.answer .text blockquote { margin: 0 0 8px; padding: 2px 0 2px 12px; border-left: 3px solid var(--line);
  color: var(--muted); }
.answer .text blockquote > :last-child { margin-bottom: 0; }
.answer .text hr { margin: 12px 0; border: 0; border-top: 1px solid var(--line); }
.answer .text a { color: var(--accent); text-decoration: underline; text-underline-offset: 2px; }
.answer .text :not(pre) > code {
  padding: 1px 4px;
  background: var(--code);
  border-radius: 4px;
  font: 0.88em ui-monospace, SFMono-Regular, Menlo, Consolas, "DejaVu Sans Mono", monospace;
}
.answer .text pre { overflow-wrap: normal; }
.answer .text .table-wrap { margin: 0 0 10px; overflow-x: auto; }
.answer .text table { width: auto; min-width: 50%; font-size: 13px; }
.answer .text th, .answer .text td { padding: 5px 10px; border: 1px solid var(--line); text-align: left;
  vertical-align: top; overflow-wrap: normal; }
.answer .text th { background: var(--code); font-weight: 600; }
.answer .text .align-center { text-align: center; }
.answer .text .align-right { text-align: right; }

pre {
  position: relative;
  margin: 0 0 8px;
  padding: 10px 12px;
  background: var(--code);
  border-radius: 6px;
  overflow-x: auto;
  font: 13px/1.45 ui-monospace, SFMono-Regular, Menlo, Consolas, "DejaVu Sans Mono", monospace;
}
pre code { font: inherit; }
pre .lang { display: block; font-size: 11px; color: var(--muted); margin-bottom: 4px; }

.metrics { border-top: 1px dashed var(--line); padding-top: 6px; font-size: 13px; }
.metrics p { margin: 2px 0; }
.error { color: var(--error); background: var(--error-bg); border-radius: 6px; padding: 6px 10px; }
.error p { margin: 2px 0; }
.ok { color: var(--ok); }

#composer { margin-top: 16px; display: grid; gap: 8px; }
.controls { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.controls .spacer { flex: 1; }
.attach input { display: none; }
.attachments { display: flex; flex-wrap: wrap; gap: 8px; margin: 0; padding: 0; list-style: none; }
.attachments:empty { display: none; }
.attachments li { position: relative; }
.attachments .remove { position: absolute; top: 0; right: 0; padding: 0 6px; line-height: 1.4; }

/* the metrics tab */

#metrics { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.panel header { display: flex; align-items: center; gap: 12px; margin-bottom: 8px; }
.panel h2 { margin: 0; font-size: 15px; flex: 1; }
.panel .updated { font-size: 12px; color: var(--muted); }
table { width: 100%; border-collapse: collapse; font-size: 13px; }
th, td { text-align: left; padding: 4px 8px; border-bottom: 1px solid var(--line); }
td:not(:first-child), th:not(:first-child) { text-align: right; }

@media (max-width: 800px) {
  .columns, #metrics { grid-template-columns: 1fr; }
  .columns { grid-template-rows: none; gap: 16px; }
  .column { display: flex; flex-direction: column; grid-row: auto; }   /* stacked: no shared header row */
  .log { max-height: none; }
}