/* Reference UI — mobile-first, fluid, fills any screen (the pattern GOV-B7 mandates
   and the fix model for the Dashboard/Help-Hub alignment defect DEF-093):
   no fixed page width; one fluid grid; a wide-screen content cap that CENTERS;
   tables and threads scroll horizontally INSIDE their boxes, never the page. */

:root {
  --bg: #0f1117;
  --panel: #171a23;
  --line: #262b38;
  --text: #e8eaf0;
  --muted: #9aa3b5;
  --accent: #4f8cff;
  --accent-ink: #ffffff;
  --danger: #ff6b6b;
  --me: #24406e;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  min-height: 100%;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.55 system-ui, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

.shell {
  display: grid;
  grid-template-rows: 1fr;
  min-height: 100dvh;                 /* fills the full screen on phone and desktop */
  padding: clamp(12px, 3vw, 32px);
}

.panel {
  width: min(100%, 26rem);            /* centered, never overflows */
  margin: auto;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: clamp(18px, 4vw, 32px);
}

h1 { font-size: clamp(1.15rem, 4vw, 1.5rem); margin: 0 0 .25rem; }
.sub { color: var(--muted); margin: 0 0 1.25rem; font-size: .9rem; }

.stack { display: grid; gap: .5rem; }
.stack label { font-size: .85rem; color: var(--muted); }

input, textarea, button {
  font: inherit;
  color: inherit;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: .6rem .75rem;
  width: 100%;
}
textarea { resize: vertical; min-height: 2.6rem; }

button { cursor: pointer; width: auto; }
.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); font-weight: 600; }
.ghost { background: transparent; color: var(--muted); }
button:hover { filter: brightness(1.1); }

.error { color: var(--danger); font-size: .9rem; }

/* chat layout: fluid rows, full height */
#chat-view {
  display: grid;
  grid-template-rows: auto 1fr auto auto;
  gap: .75rem;
  min-height: 100dvh;
  max-width: 64rem;                   /* a reading cap on ultrawide screens … */
  margin-inline: auto;                /* … that CENTERS instead of hugging the left */
}

.bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: .75rem;
  flex-wrap: wrap;                    /* narrow screens wrap instead of overflow */
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: .6rem .9rem;
}
.bar-right { display: flex; align-items: center; gap: .6rem; }
.engine { color: var(--muted); font-size: .8rem; border: 1px solid var(--line); border-radius: 999px; padding: .1rem .6rem; }

.thread {
  list-style: none;
  margin: 0;
  padding: .9rem;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: auto;                     /* long content scrolls HERE, not the page */
  display: grid;
  gap: .6rem;
  align-content: start;
  overflow-wrap: anywhere;            /* long tokens never push the layout wide */
}
.thread li { max-width: 92%; border-radius: 10px; padding: .5rem .8rem; background: var(--bg); }
.thread li.me { background: var(--me); justify-self: end; }
.thread li.engine { justify-self: start; }

.composer { display: grid; grid-template-columns: 1fr auto; gap: .5rem; align-items: end; }
.composer textarea { min-height: 2.8rem; }

@media (max-width: 30rem) {           /* phones: single-column composer */
  .composer { grid-template-columns: 1fr; }
  .composer .primary { width: 100%; }
  .thread li { max-width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}