:root {
  --bg: #f4f6fb;
  --card: #ffffff;
  --ink: #17203a;
  --muted: #6b7488;
  --brand: #1f5fd6;
  --brand-dk: #17408f;
  --accent: #eaf1ff;
  --line: #e3e7f0;
  --ok: #1f9d63;
  --radius: 14px;
  --shadow: 0 2px 12px rgba(20, 35, 75, .07);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: system-ui, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--ink);
  display: flex;
  flex-direction: column;
}

/* ── header ── */
.top {
  display: flex; align-items: center; gap: 18px;
  padding: 12px 20px; background: var(--card);
  border-bottom: 1px solid var(--line); box-shadow: var(--shadow);
  position: sticky; top: 0; z-index: 10;
}
.brand { font-size: 19px; font-weight: 600; }
.brand b { color: var(--brand); }
.tabs { display: flex; gap: 6px; }
.tabs button {
  border: 0; background: transparent; color: var(--muted);
  padding: 8px 14px; border-radius: 999px; cursor: pointer;
  font-size: 14px; font-weight: 600;
}
.tabs button.active { background: var(--accent); color: var(--brand-dk); }
.llm-badge {
  margin-left: auto; font-size: 12px; color: var(--muted);
  padding: 4px 10px; border: 1px solid var(--line); border-radius: 999px;
}

main { flex: 1; display: flex; justify-content: center; padding: 18px; }
.view { display: none; width: 100%; max-width: 820px; }
.view.active { display: flex; flex-direction: column; }

/* ── chat ── */
.chat { flex: 1; display: flex; flex-direction: column; gap: 12px; padding: 6px 2px 12px; }
.msg { display: flex; }
.msg.user { justify-content: flex-end; }
.bubble {
  max-width: 78%; padding: 12px 15px; border-radius: var(--radius);
  line-height: 1.5; box-shadow: var(--shadow); white-space: pre-wrap;
}
.msg.bot .bubble { background: var(--card); border: 1px solid var(--line);
  border-top-left-radius: 4px; }
.msg.user .bubble { background: var(--brand); color: #fff; border-top-right-radius: 4px; }
.bubble a { color: var(--brand); }
.msg.user .bubble a { color: #fff; }

.sources { margin-top: 9px; padding-top: 8px; border-top: 1px dashed var(--line);
  font-size: 12.5px; color: var(--muted); }
.sources b { color: var(--ink); font-weight: 600; }
.sources ul { margin: 5px 0 0; padding-left: 16px; }
.sources li { margin: 2px 0; }

.typing .bubble { color: var(--muted); font-style: italic; }

.suggestions { display: flex; flex-wrap: wrap; gap: 8px; padding: 4px 2px 12px; }
.suggestions button {
  border: 1px solid var(--line); background: var(--card); color: var(--brand-dk);
  padding: 7px 12px; border-radius: 999px; cursor: pointer; font-size: 13px;
}
.suggestions button:hover { background: var(--accent); }

.composer { display: flex; gap: 10px; padding: 8px 0 4px; position: sticky; bottom: 0;
  background: linear-gradient(transparent, var(--bg) 30%); }
.composer input {
  flex: 1; padding: 13px 16px; border-radius: 999px; border: 1px solid var(--line);
  font-size: 15px; background: var(--card); outline: none;
}
.composer input:focus { border-color: var(--brand); }
.composer button {
  border: 0; background: var(--brand); color: #fff; font-weight: 600;
  padding: 0 22px; border-radius: 999px; cursor: pointer; font-size: 15px;
}
.composer button:disabled { opacity: .5; cursor: default; }

/* ── programs ── */
.prog-head { display: flex; align-items: center; gap: 14px; margin-bottom: 14px; flex-wrap: wrap; }
.prog-head h2 { margin: 0; font-size: 20px; }
#prog-filter { flex: 1; min-width: 200px; padding: 10px 14px; border-radius: 10px;
  border: 1px solid var(--line); font-size: 14px; }
.programs { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 12px; }
.pcard { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 14px 16px; box-shadow: var(--shadow); }
.pcard .code { font-size: 12px; font-weight: 700; color: var(--brand); letter-spacing: .3px; }
.pcard h3 { margin: 4px 0 6px; font-size: 15.5px; }
.pcard .spec { font-size: 12.5px; color: var(--muted); margin-bottom: 10px; }
.pcard .focus { font-size: 13px; line-height: 1.45; }
.pcard .meta { margin-top: 10px; display: flex; flex-wrap: wrap; gap: 6px; }
.chip { font-size: 11.5px; background: var(--accent); color: var(--brand-dk);
  padding: 3px 8px; border-radius: 999px; }
.grp-title { grid-column: 1/-1; margin: 14px 0 2px; font-size: 13px; font-weight: 700;
  color: var(--muted); text-transform: uppercase; letter-spacing: .5px; }

.foot { text-align: center; font-size: 12.5px; color: var(--muted);
  padding: 14px; border-top: 1px solid var(--line); background: var(--card); }
.foot a { color: var(--brand); }

@media (max-width: 560px) {
  .brand span { display: none; }
  .bubble { max-width: 88%; }
}