/* Deliberately plain: no build step, no framework, one stylesheet. */

:root {
  --bg: #11131a;
  --panel: #181b24;
  --line: #262b38;
  --text: #e6e8ee;
  --dim: #98a0b3;
  --accent: #7cc4ff;
  --bot: #d8b4fe;
  --ok: #86efac;
  --warn: #fca5a5;
  color-scheme: dark;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f7f8fb;
    --panel: #ffffff;
    --line: #e3e6ee;
    --text: #1a1d26;
    --dim: #5d6678;
    --accent: #1d6fb8;
    --bot: #7c3aed;
    --ok: #157f3d;
    --warn: #b91c1c;
    color-scheme: light;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0 auto;
  padding: 2rem 1.25rem 4rem;
  max-width: 52rem;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.55 ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
}

h1 {
  margin: 0;
  font-size: 1.6rem;
  letter-spacing: -0.01em;
}

h1 .sub {
  color: var(--dim);
  font-size: 1rem;
  font-weight: 400;
}

.blurb {
  color: var(--dim);
  max-width: 44rem;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 1rem;
  margin: 1rem 0;
}

.row {
  display: flex;
  gap: 0.6rem;
  align-items: center;
  flex-wrap: wrap;
}

label {
  color: var(--dim);
}

select,
input[type="text"],
textarea,
button {
  font: inherit;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 7px;
  padding: 0.5rem 0.7rem;
}

textarea {
  width: 100%;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 13px;
  resize: vertical;
}

input[type="text"] {
  flex: 1;
  min-width: 12rem;
}

button {
  cursor: pointer;
  border-color: var(--accent);
  color: var(--accent);
  font-weight: 600;
}

button:hover:not(:disabled) {
  background: color-mix(in srgb, var(--accent) 14%, transparent);
}

button:disabled {
  opacity: 0.45;
  cursor: default;
  border-color: var(--line);
  color: var(--dim);
}

.tabs {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
  margin-top: 1rem;
}

.tabs button {
  border-color: var(--line);
  color: var(--dim);
  font-weight: 500;
}

.tabs button[aria-selected="true"] {
  border-color: var(--accent);
  color: var(--accent);
}

.hint,
.status {
  color: var(--dim);
  font-size: 0.88rem;
}

.result {
  font-size: 0.9rem;
}

.result.block {
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 7px;
  padding: 0.75rem;
  margin: 0.75rem 0 0;
  white-space: pre-wrap;
  overflow-x: auto;
  min-height: 2rem;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 13px;
}

.transcript {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  min-height: 12rem;
  max-height: 26rem;
  overflow-y: auto;
  margin-bottom: 0.9rem;
}

.turn {
  max-width: 85%;
  padding: 0.45rem 0.7rem;
  border-radius: 9px;
  border: 1px solid var(--line);
}

.turn.you {
  align-self: flex-end;
  border-color: color-mix(in srgb, var(--accent) 45%, var(--line));
}

.turn.bot {
  align-self: flex-start;
}

.turn .who {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--dim);
}

.turn.bot .who {
  color: var(--bot);
}

.turn .meta {
  color: var(--dim);
  font-size: 0.75rem;
}

.progress .bar {
  display: block;
  height: 6px;
  background: var(--line);
  border-radius: 99px;
  overflow: hidden;
  margin: 0.5rem 0 0.35rem;
}

.progress .bar span {
  display: block;
  height: 100%;
  width: 0;
  background: var(--accent);
  transition: width 0.15s linear;
}

.board {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 13px;
  line-height: 1.15;
  letter-spacing: 0.22em;
  margin: 0.9rem 0 0;
  overflow-x: auto;
}

footer {
  color: var(--dim);
  font-size: 0.85rem;
  border-top: 1px solid var(--line);
  padding-top: 0.9rem;
}

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.88em;
}