:root {
  --bg: #f4f7fb; --card: #fff; --text: #14213d; --muted: #5b6b86; --line: #d9e1ee;
  --brand: #1f5eff; --warn-bg: #fdecec; --warn-line: #f2b8b5; --warn-text: #8a1c14;
  --ok-bg: #e8f6ee; --ok-line: #a8dbbc; --ok-text: #14532d; --err: #b3261e;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #0e1626; --card: #16213a; --text: #e8eefc; --muted: #9db0d3; --line: #2a3a5c;
          --warn-bg: #3a1c1c; --warn-line: #7a3a36; --warn-text: #ffb4ab;
          --ok-bg: #12301f; --ok-line: #2f6b47; --ok-text: #a8e6c1; --err: #ffb4ab; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans", "Noto Sans Devanagari", "Noto Sans Tamil", sans-serif; }
.wrap { max-width: 480px; margin: 0 auto; padding: 16px; }
.top { display: flex; align-items: center; justify-content: space-between; }
.brand { font-weight: 800; font-size: 1.4rem; }
.lang select { padding: 6px 8px; border-radius: 8px; border: 1px solid var(--line); background: var(--card); color: var(--text); }
.secure { color: var(--muted); font-size: .85rem; text-align: center; margin: 12px 0; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 16px; margin-bottom: 14px; }
.card h1 { font-size: 1.1rem; margin: 0 0 8px; }
.card h2 { font-size: 1.05rem; margin: 0 0 12px; }
.notice { background: var(--warn-bg); border-color: var(--warn-line); color: var(--warn-text); }
.notice .muted { color: inherit; opacity: .85; }
.ok { background: var(--ok-bg); border-color: var(--ok-line); color: var(--ok-text); }
label { display: block; font-weight: 600; margin: 12px 0 6px; }
select, textarea { width: 100%; padding: 12px; font: inherit; color: var(--text); background: var(--bg); border: 1px solid var(--line); border-radius: 10px; }
button { width: 100%; margin-top: 16px; padding: 14px; font: inherit; font-weight: 700; color: #fff; background: var(--brand); border: 0; border-radius: 10px; }
button:disabled { opacity: .6; }
.error { color: var(--err); margin: 10px 0 0; }
.muted { color: var(--muted); }
.small { font-size: .82rem; margin-top: 12px; }
.hidden { display: none !important; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }