:root {
  --glaze: #dce5dd;      /* celadon: fundo */
  --slip: #eef2ee;       /* superfície clara */
  --cobalt: #18304f;     /* esmalte: texto e −1 */
  --cobalt-2: #3c5a80;
  --moss: #5c7a3a;       /* +1 */
  --moss-hi: #7fa04f;
  --umber: #6b4e35;      /* terra do vaso: detalhes */
  --zero: #a7b5ab;       /* 0 */
  --empty: #c6d1c8;
  --line: #b9c6bc;
  --muted: #4d5f6e;
  --danger: #9a3324;

  --display: "Young Serif", Georgia, serif;
  --body: "Familjen Grotesk", system-ui, sans-serif;
  --mono: "Martian Mono", ui-monospace, monospace;

  --radius: 10px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --glaze: #0e1823;
    --slip: #15222f;
    --cobalt: #d8e4da;
    --cobalt-2: #7fa3d1;
    --moss: #9dbb6e;
    --moss-hi: #b9d08f;
    --umber: #c49a72;
    --zero: #46596a;
    --empty: #1d2c3a;
    --line: #26384a;
    --muted: #93a5b4;
    --danger: #e0806c;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --glaze: #0e1823; --slip: #15222f; --cobalt: #d8e4da; --cobalt-2: #7fa3d1;
  --moss: #9dbb6e; --moss-hi: #b9d08f; --umber: #c49a72; --zero: #46596a;
  --empty: #1d2c3a; --line: #26384a; --muted: #93a5b4; --danger: #e0806c;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body {
  background: var(--glaze);
  color: var(--cobalt);
  font: 400 16px/1.55 var(--body);
  -webkit-font-smoothing: antialiased;
}
button, select, textarea { font: inherit; color: inherit; }
:focus-visible { outline: 2px solid var(--moss); outline-offset: 2px; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }

/* ---------- layout ---------- */
.shell {
  display: grid;
  grid-template-columns: minmax(320px, 400px) 1fr;
  height: 100dvh;
}
.rail {
  min-width: 0;
  overflow-x: hidden;
  display: flex;
  flex-direction: column;
  gap: 20px;
  padding: 28px 28px;
  border-right: 1px solid var(--line);
  overflow-y: auto;
}
.chat {
  display: grid;
  grid-template-rows: 1fr auto;
  min-height: 0;
  background: var(--slip);
}

/* ---------- masthead ---------- */
.eyebrow {
  margin: 0 0 10px;
  font: 400 11px/1 var(--mono);
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--umber);
}
h1 {
  margin: 0;
  font: 400 27px/1.18 var(--display);
  letter-spacing: -.01em;
  text-wrap: balance;
}
h1 em {
  font-style: normal;
  font-family: var(--mono);
  font-size: .78em;
  font-weight: 500;
  color: var(--moss);
  white-space: nowrap;
}
.lede { margin: 12px 0 0; color: var(--muted); font-size: 15px; }

/* ---------- campo de trits (assinatura) ---------- */
.field-wrap { margin: 0; }
.field {
  display: grid;
  grid-template-columns: repeat(36, minmax(0, 1fr));
  gap: 2px;
  font: 500 8px/1 var(--mono);
  user-select: none;
}
.field span {
  aspect-ratio: 1;
  display: grid;
  place-items: center;
  border-radius: 2px;
  overflow: hidden;
  background: var(--empty);
  color: transparent;
  transition: background-color .35s ease, color .35s ease;
}
.field span.n { background: var(--cobalt); color: var(--glaze); }
.field span.z { background: var(--zero); color: var(--slip); }
.field span.p { background: var(--moss); color: var(--glaze); }
.field span.hot { background: var(--moss-hi); color: var(--cobalt); transition: none; }
.field-cap {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-top: 8px;
  font: 300 10.5px/1.4 var(--mono);
  color: var(--muted);
}
.k { font-style: normal; margin-right: 8px; }
.k::before {
  content: "";
  display: inline-block;
  width: 8px; height: 8px;
  margin-right: 4px;
  border-radius: 2px;
  vertical-align: -1px;
}
.k-neg::before { background: var(--cobalt); }
.k-zero::before { background: var(--zero); }
.k-pos::before { background: var(--moss); }

/* ---------- status ---------- */
.status { display: grid; gap: 10px; }
.status-line { margin: 0; font-weight: 600; }
.status-line.err { color: var(--danger); }
.status-sub { margin: 0; font: 300 12px/1.5 var(--mono); color: var(--muted); }
.status-sub:empty { display: none; }
.bar { height: 4px; background: var(--empty); border-radius: 2px; overflow: hidden; }
.bar span { display: block; height: 100%; width: 0; background: var(--moss); transition: width .3s ease; }

/* ---------- specs ---------- */
.specs { margin: auto 0 0; display: grid; gap: 0; border-top: 1px solid var(--line); }
.specs div {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 7px 0;
  border-bottom: 1px solid var(--line);
  font: 400 11.5px/1.4 var(--mono);
}
.specs dt { color: var(--muted); }
.specs dd { margin: 0; text-align: right; overflow-wrap: anywhere; }

/* ---------- botões ---------- */
.btn {
  border: 1px solid transparent;
  border-radius: var(--radius);
  padding: 10px 16px;
  font-weight: 600;
  font-size: 15px;
  cursor: pointer;
  transition: background-color .15s, opacity .15s;
}
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn-primary { background: var(--cobalt); color: var(--glaze); }
.btn-primary:not(:disabled):hover { background: var(--cobalt-2); }
.btn-ghost { background: transparent; border-color: var(--line); }
.btn-ghost:not(:disabled):hover { background: var(--glaze); }
.btn-stop { background: var(--umber); color: var(--slip); }

/* ---------- transcript ---------- */
.transcript {
  overflow-y: auto;
  padding: 40px clamp(16px, 5vw, 64px) 24px;
  display: flex;
  flex-direction: column;
  gap: 22px;
  min-height: 0;
}
.empty { margin: auto; max-width: 520px; text-align: center; }
.empty-title { margin: 0 0 8px; font: 400 24px/1.25 var(--display); }
.empty-body { margin: 0 0 22px; color: var(--muted); }
.chips { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px; }
.chip {
  border: 1px solid var(--line);
  background: var(--glaze);
  border-radius: 999px;
  padding: 7px 14px;
  font-size: 14px;
  cursor: pointer;
}
.chip:disabled { opacity: .5; cursor: not-allowed; }
.chip:not(:disabled):hover { border-color: var(--moss); }

.msg { max-width: 760px; width: 100%; margin: 0 auto; }
.msg-who {
  margin: 0 0 6px;
  font: 400 10.5px/1 var(--mono);
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--umber);
}
.msg-user .msg-body {
  background: var(--glaze);
  border-radius: var(--radius);
  padding: 12px 16px;
  white-space: pre-wrap;
}
.msg-body > :first-child { margin-top: 0; }
.msg-body > :last-child { margin-bottom: 0; }
.msg-body pre {
  background: var(--glaze);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px 14px;
  overflow-x: auto;
  font: 400 12.5px/1.55 var(--mono);
}
.msg-body code { font-family: var(--mono); font-size: .86em; }
.msg-body :not(pre) > code { background: var(--glaze); padding: 1px 5px; border-radius: 4px; }
.msg-body table { border-collapse: collapse; }
.msg-body th, .msg-body td { border: 1px solid var(--line); padding: 4px 8px; }
.msg-meta { margin: 8px 0 0; font: 300 11px/1 var(--mono); color: var(--muted); }
.msg-err .msg-body { color: var(--danger); }
.caret::after {
  content: "▍";
  margin-left: 2px;
  color: var(--moss);
  animation: blink 1s steps(2) infinite;
}
@keyframes blink { 50% { opacity: 0; } }

/* ---------- composer ---------- */
.composer {
  border-top: 1px solid var(--line);
  padding: 14px clamp(16px, 5vw, 64px) 18px;
  display: grid;
  gap: 10px;
}
.composer textarea {
  width: 100%;
  max-width: 760px;
  margin: 0 auto;
  display: block;
  resize: none;
  min-height: 48px;
  max-height: 220px;
  overflow-y: hidden;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--glaze);
}
.composer textarea:disabled { opacity: .6; }
.composer-row {
  width: 100%;
  max-width: 760px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 10px;
}
.len { display: flex; align-items: center; gap: 8px; margin-right: auto; font: 400 11px/1 var(--mono); color: var(--muted); }
.len select {
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--glaze);
  padding: 5px 6px;
  font: 400 11px/1 var(--mono);
}

/* ---------- mobile ---------- */
@media (max-width: 860px) {
  .shell { grid-template-columns: 1fr; height: auto; min-height: 100dvh; }
  .rail { border-right: 0; border-bottom: 1px solid var(--line); padding: 24px 16px; overflow: visible; }
  .field { grid-template-columns: repeat(36, minmax(0, 1fr)); gap: 1.5px; font-size: 0; }
  .specs { margin-top: 0; }
  .chat { min-height: 80dvh; }
  .transcript { padding: 28px 16px 16px; }
  .composer { padding: 12px 16px 16px; position: sticky; bottom: 0; background: var(--slip); }
  .len span { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  .field span, .bar span { transition: none; }
  .caret::after { animation: none; }
}