/* OTPBox UI: mobile-first, no scripts, light and dark. */
:root {
  --bg: #f6f7f9; --fg: #16181d; --muted: #5b6270; --card: #ffffff; --line: #dfe3ea;
  --accent: #2557d6; --accent-fg: #ffffff; --danger: #b42318; --note: #eef3ff; --err: #fdecea;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #111317; --fg: #e8eaee; --muted: #9aa3b2; --card: #1a1d23; --line: #2b2f38;
    --accent: #7aa2ff; --accent-fg: #0d1020; --danger: #ff8a80; --note: #1c2540; --err: #3a1d1b; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 16px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif; }
a { color: var(--accent); }
.top { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; justify-content: space-between; padding: 12px 16px; border-bottom: 1px solid var(--line); background: var(--card); }
.brand { font-weight: 700; text-decoration: none; color: var(--fg); }
.who { color: var(--muted); font-size: 14px; margin-right: 8px; word-break: break-all; }
main { max-width: 860px; margin: 0 auto; padding: 16px; }
footer { max-width: 860px; margin: 0 auto; padding: 16px; color: var(--muted); font-size: 13px; }
/* "by Zodo": the studio behind OTPBox, as quiet as the hosting note. */
.by-zodo { display: inline-flex; align-items: center; gap: 6px; color: var(--muted); text-decoration: none; }
.by-zodo:hover { color: var(--fg); }
.by-zodo svg { width: 16px; height: 16px; display: block; }
h1 { font-size: 22px; margin: 8px 0; word-break: break-word; }
h2 { font-size: 17px; margin: 16px 0 8px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 16px; margin-bottom: 16px; }
.hero .lead { font-size: 18px; color: var(--muted); }
.notice { background: var(--note); border-radius: 8px; padding: 8px 12px; }
.notice.error { background: var(--err); }
.grid { display: grid; grid-template-columns: 1fr; gap: 2px 16px; margin: 0; }
.grid dt { color: var(--muted); font-size: 14px; }
.grid dd { margin: 0 0 8px; word-break: break-word; }
@media (min-width: 600px) { .grid { grid-template-columns: max-content 1fr; } .grid dd { margin: 0; } }
.list { list-style: none; margin: 0; padding: 0; }
.list li { display: flex; flex-wrap: wrap; gap: 4px 12px; align-items: baseline; padding: 8px 0; border-bottom: 1px solid var(--line); }
.list li:last-child { border-bottom: 0; }
.stack { display: grid; gap: 8px; }
.row { display: flex; flex-wrap: wrap; gap: 8px; }
.row input { flex: 1 1 200px; }
.inline { display: inline; }
label { display: grid; gap: 4px; font-size: 14px; color: var(--muted); }
input, select, button, .button { font: inherit; padding: 10px 12px; border-radius: 8px; border: 1px solid var(--line); background: var(--bg); color: var(--fg); min-height: 44px; }
button, .button { background: var(--accent); color: var(--accent-fg); border-color: var(--accent); cursor: pointer; text-decoration: none; display: inline-block; }
button.link { background: none; border: 0; color: var(--accent); padding: 0; min-height: 0; text-decoration: underline; }
.danger { color: var(--danger); }
button.danger { background: none; border-color: var(--danger); color: var(--danger); }
button.link.danger { border: 0; }
.mono, code { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
.address { font-size: 18px; word-break: break-all; }
.code { background: var(--note); border-radius: 6px; padding: 2px 8px; }
.codes.big .code { font-size: 24px; letter-spacing: 2px; }
.secret { word-break: break-all; display: block; margin-top: 4px; }
.wrap { word-break: break-all; }
iframe.body { width: 100%; height: 420px; border: 1px solid var(--line); border-radius: 8px; background: #ffffff; }
pre.text { white-space: pre-wrap; word-break: break-word; font-size: 14px; }
small { color: var(--muted); }
meter { display: block; width: 100%; max-width: 320px; height: 12px; margin-top: 4px; }