:root {
  --bg: #f6f7f9;
  --panel: #ffffff;
  --text: #15181d;
  --muted: #5d6673;
  --border: #e2e6eb;
  --accent: #0a84c6;       /* Rwanda sky blue, slightly deepened for contrast */
  --accent-2: #20603d;     /* Rwanda green */
  --sun: #e5b800;          /* Rwanda yellow */
  --user: #e9f4fb;
  --danger: #c0392b;
  --kin: #20603d; --eng: #0a6fb0; --fra: #7b3fb5; --swh: #b5651d; --other: #6b7280;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(16, 24, 40, .06), 0 2px 8px rgba(16, 24, 40, .05);
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1216; --panel: #171b21; --text: #e8ebef; --muted: #9aa4b1; --border: #272d36;
    --accent: #3fb0ea; --accent-2: #4caf7a; --user: #13293a;
    --kin: #5ccf8f; --eng: #5cb3f0; --fra: #b48cf0; --swh: #f0a35c;
    --shadow: none;
  }
}
* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font: 15px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  display: grid; grid-template-rows: auto 1fr auto;
}
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }

.topbar { display: flex; align-items: center; justify-content: space-between; padding: 10px 20px;
  border-bottom: 1px solid var(--border); background: var(--panel); }
.brand { display: flex; align-items: center; gap: 10px; }
.logo { color: var(--sun); display: grid; place-items: center; width: 36px; height: 36px; border-radius: 10px;
  background: color-mix(in srgb, var(--accent) 14%, transparent); }
h1 { font-size: 18px; margin: 0; letter-spacing: .2px; }
.tagline { margin: 0; color: var(--muted); font-size: 12.5px; }
.status { font-size: 12.5px; color: var(--muted); display: flex; align-items: center; gap: 6px; }
.status::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--muted); }
.status.ok::before { background: #2ecc71; } .status.err::before { background: var(--danger); }

.thread { overflow-y: auto; padding: 24px max(16px, calc(50% - 400px)); display: flex; flex-direction: column; gap: 14px; }
.welcome { text-align: center; margin: 6vh auto 0; max-width: 620px; }
.welcome h2 { margin: 0 0 6px; font-size: 24px; }
.welcome p { color: var(--muted); margin: 0 0 18px; }
.examples { display: flex; flex-direction: column; gap: 8px; }
.example { text-align: left; background: var(--panel); border: 1px solid var(--border); border-radius: 10px;
  padding: 10px 14px; color: var(--text); cursor: pointer; font: inherit; box-shadow: var(--shadow); }
.example:hover { border-color: var(--accent); }

.msg { max-width: 100%; border-radius: var(--radius); padding: 12px 16px; box-shadow: var(--shadow); }
.msg.user { align-self: flex-end; background: var(--user); max-width: 85%; white-space: pre-wrap; }
.msg.bot { align-self: stretch; background: var(--panel); border: 1px solid var(--border); }
.msg.error { border-color: var(--danger); color: var(--danger); }
.meta { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; margin-bottom: 8px; font-size: 12.5px; color: var(--muted); }
.chip { border: 1px solid var(--border); border-radius: 999px; padding: 1px 9px; font-size: 12px; white-space: nowrap; }
.chip.mixed { border-color: var(--sun); color: var(--text); background: color-mix(in srgb, var(--sun) 16%, transparent); }
.result { font-size: 17px; white-space: pre-wrap; }
.source { margin-top: 10px; padding-top: 8px; border-top: 1px dashed var(--border); font-size: 13.5px; color: var(--muted); }
.span { border-bottom: 2.5px solid var(--other); padding-bottom: 1px; }
.span.kin { border-color: var(--kin); } .span.eng { border-color: var(--eng); }
.span.fra { border-color: var(--fra); } .span.swh { border-color: var(--swh); }
.legend { display: inline-flex; gap: 8px; align-items: center; font-size: 11.5px; }
.lg { display: inline-block; width: 10px; height: 3px; border-radius: 2px; }
.lg.kin { background: var(--kin); } .lg.eng { background: var(--eng); } .lg.fra { background: var(--fra); } .lg.swh { background: var(--swh); }
.actions { display: flex; gap: 8px; margin-top: 10px; align-items: center; flex-wrap: wrap; }
.actions audio { height: 34px; max-width: 100%; }
.small-btn { font: inherit; font-size: 12.5px; border: 1px solid var(--border); background: transparent; color: var(--text);
  border-radius: 8px; padding: 4px 10px; cursor: pointer; }
.small-btn:hover { border-color: var(--accent); }
.steps { list-style: none; padding: 0; margin: 0 0 10px; font-size: 13px; color: var(--muted); display: grid; gap: 4px; }
.steps li::before { content: "› "; color: var(--accent); }
.sources { margin: 10px 0 0; padding-left: 18px; font-size: 13px; }
.sources a, .page-title a { color: var(--accent); word-break: break-all; }
.para { margin: 0 0 10px; }
.para .orig { display: none; color: var(--muted); font-size: 13px; margin-top: 2px; }
.show-orig .para .orig { display: block; }
.typing { display: inline-flex; gap: 4px; }
.typing i { width: 6px; height: 6px; border-radius: 50%; background: var(--muted); animation: blink 1.2s infinite; }
.typing i:nth-child(2) { animation-delay: .2s; } .typing i:nth-child(3) { animation-delay: .4s; }
@keyframes blink { 0%, 80%, 100% { opacity: .25; } 40% { opacity: 1; } }

.composer { border-top: 1px solid var(--border); background: var(--panel); padding: 10px max(16px, calc(50% - 400px)) 8px; }
.controls { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; justify-content: space-between; margin-bottom: 8px; }
.modes { display: inline-flex; background: var(--bg); border: 1px solid var(--border); border-radius: 10px; padding: 3px; }
.mode { font: inherit; font-size: 13px; border: 0; background: transparent; color: var(--muted); padding: 5px 11px; border-radius: 7px; cursor: pointer; }
.mode.active { background: var(--panel); color: var(--text); box-shadow: var(--shadow); font-weight: 600; }
.langs, .voice { display: inline-flex; gap: 6px; align-items: center; }
select { font: inherit; font-size: 13px; color: var(--text); background: var(--bg); border: 1px solid var(--border);
  border-radius: 8px; padding: 5px 8px; }
.toggle { display: inline-flex; align-items: center; gap: 5px; font-size: 13px; cursor: pointer; }
.icon-btn { border: 1px solid var(--border); background: var(--bg); color: var(--text); border-radius: 8px;
  min-width: 34px; height: 32px; cursor: pointer; display: grid; place-items: center; font-size: 15px; }
.icon-btn:hover { border-color: var(--accent); }
.input-row { display: flex; gap: 8px; align-items: flex-end; }
textarea { flex: 1; resize: none; font: inherit; color: var(--text); background: var(--bg); border: 1px solid var(--border);
  border-radius: 12px; padding: 10px 12px; max-height: 180px; outline: none; overflow-y: hidden; line-height: 1.4; }
textarea:focus { border-color: var(--accent); }
.mic { height: 42px; width: 42px; border-radius: 12px; }
.mic.recording { background: var(--danger); color: #fff; border-color: var(--danger); animation: pulse 1.4s infinite; }
@keyframes pulse { 50% { box-shadow: 0 0 0 6px color-mix(in srgb, var(--danger) 25%, transparent); } }
.send { height: 42px; width: 42px; border: 0; border-radius: 12px; background: var(--accent); color: #fff; cursor: pointer; display: grid; place-items: center; }
.send:disabled { opacity: .5; cursor: progress; }
.hint { margin: 6px 0 0; font-size: 11.5px; color: var(--muted); text-align: center; }

@media (max-width: 640px) {
  .controls { flex-direction: column; align-items: stretch; }
  .modes { justify-content: space-between; } .mode { flex: 1; }
  .langs select { flex: 1; } .voice { justify-content: space-between; }
  .msg.user { max-width: 95%; }
}

.context { flex-basis: 100%; font: inherit; font-size: 13px; color: var(--text); background: var(--bg);
  border: 1px solid var(--border); border-radius: 8px; padding: 6px 10px; display: none; }
.context.show { display: block; }
.upload { height: 42px; width: 42px; border-radius: 12px; cursor: pointer; }