:root {
  --bg: #f6f7f4; --surface: #ffffff; --ink: #1d2320; --muted: #5d6762; --line: #dfe3df;
  --brand: #1f6f50; --brand-ink: #ffffff; --accent: #e0a526; --danger: #b3261e; --ok: #1f7a3f;
  --radius: 12px; --shadow: 0 1px 2px rgba(0,0,0,.06), 0 2px 8px rgba(0,0,0,.05);
  font-family: "Segoe UI", system-ui, -apple-system, "Noto Sans Tamil", Roboto, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root { --bg:#121614; --surface:#1b201d; --ink:#e7ece9; --muted:#a3ada8; --line:#2c3430; --brand:#5cc59a; --brand-ink:#0d1a14; --accent:#f0bf52; --danger:#ff8a80; --ok:#7fd99a; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink); font-size: 16px; line-height: 1.45; }
header.top { position: sticky; top: 0; z-index: 5; display: flex; align-items: center; gap: 12px; padding: 10px 16px; background: var(--surface); border-bottom: 1px solid var(--line); }
header.top h1 { font-size: 18px; margin: 0; flex: 1; }
header.top .brand { color: var(--brand); }
nav.tabs { display: flex; gap: 4px; overflow-x: auto; padding: 8px 12px; background: var(--surface); border-bottom: 1px solid var(--line); }
nav.tabs button { border: 0; background: none; padding: 8px 12px; border-radius: 999px; color: var(--muted); font-size: 15px; white-space: nowrap; cursor: pointer; }
nav.tabs button.active { background: var(--brand); color: var(--brand-ink); }
main { max-width: 860px; margin: 0 auto; padding: 16px; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 16px; margin-bottom: 12px; box-shadow: var(--shadow); }
.card h3 { margin: 0 0 6px; font-size: 16px; }
.muted { color: var(--muted); font-size: 14px; }
.row { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.grow { flex: 1; min-width: 0; }
label { display: block; font-size: 14px; color: var(--muted); margin: 10px 0 4px; }
input, select, textarea { width: 100%; padding: 10px 12px; border: 1px solid var(--line); border-radius: 10px; font-size: 16px; background: var(--surface); color: var(--ink); }
input[type=checkbox] { width: auto; }
textarea { min-height: 90px; }
button.btn { border: 0; border-radius: 10px; padding: 10px 14px; font-size: 15px; cursor: pointer; background: var(--brand); color: var(--brand-ink); }
button.btn.secondary { background: transparent; color: var(--brand); border: 1px solid var(--brand); }
button.btn.danger { background: var(--danger); color: #fff; }
button.btn.small { padding: 6px 10px; font-size: 14px; }
button:disabled { opacity: .5; cursor: default; }
.pill { display: inline-block; padding: 2px 8px; border-radius: 999px; font-size: 12px; background: var(--line); color: var(--ink); }
.pill.ok { background: rgba(31, 122, 63, .18); }
.pill.warn { background: rgba(224, 165, 38, .28); }
.pill.bad { background: rgba(179, 38, 30, .18); }
.chat { display: flex; flex-direction: column; gap: 8px; min-height: 50vh; max-height: 62vh; overflow-y: auto; padding: 8px 2px; }
.bubble { max-width: 85%; padding: 9px 12px; border-radius: 14px; white-space: pre-wrap; word-wrap: break-word; }
.bubble.user { align-self: flex-end; background: var(--brand); color: var(--brand-ink); border-bottom-right-radius: 4px; }
.bubble.assistant { align-self: flex-start; background: var(--surface); border: 1px solid var(--line); border-bottom-left-radius: 4px; }
.composer { display: flex; gap: 6px; align-items: flex-end; position: sticky; bottom: 0; background: var(--bg); padding: 8px 0; }
.composer textarea { min-height: 44px; height: 44px; resize: none; }
.sos { background: var(--danger); color: #fff; font-weight: 700; border: 0; border-radius: 999px; padding: 8px 14px; cursor: pointer; }
.toast { position: fixed; left: 50%; bottom: 20px; transform: translateX(-50%); background: var(--ink); color: var(--bg); padding: 10px 16px; border-radius: 10px; max-width: 90vw; z-index: 20; }
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { text-align: left; padding: 6px 8px; border-bottom: 1px solid var(--line); vertical-align: top; }
pre { white-space: pre-wrap; font-family: inherit; margin: 0; }
.hidden { display: none !important; }
.kv { display: grid; grid-template-columns: max-content 1fr; gap: 4px 12px; font-size: 14px; }
@media (max-width: 520px) { main { padding: 12px 16px; } .bubble { max-width: 92%; } }