:root {
  --bg: #fafafa;
  --fg: #1c1c1e;
  --muted: #666;
  --line: #d4d4d8;
  --card: #fff;
  --accent: #2563eb;
  --accent-fg: #fff;
  --danger: #b91c1c;
  --note-bg: #eef4ff;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111113;
    --fg: #ececee;
    --muted: #a0a0a8;
    --line: #3a3a40;
    --card: #1a1a1d;
    --accent: #5b8def;
    --accent-fg: #0b0b0c;
    --danger: #f87171;
    --note-bg: #1b2433;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans TC", sans-serif;
}

main {
  max-width: 560px;
  margin: 0 auto;
  padding: 32px 16px 64px;
}

h1 { font-size: 1.5rem; margin: 0 0 4px; }
h2 { font-size: 1.25rem; }

.muted { color: var(--muted); }
.small { font-size: 0.875rem; }

label { display: block; margin: 20px 0 6px; font-weight: 600; }
label.check { display: flex; gap: 8px; align-items: center; font-weight: 400; margin: 12px 0; }

textarea,
input[type="email"],
input[type="file"] {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--card);
  color: var(--fg);
  font: inherit;
}

textarea { resize: vertical; min-height: 140px; }

:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }

button {
  width: 100%;
  margin-top: 24px;
  padding: 12px 16px;
  border: 0;
  border-radius: 8px;
  background: var(--accent);
  color: var(--accent-fg);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}

button:disabled { opacity: 0.6; cursor: wait; }

details { margin-top: 20px; border: 1px solid var(--line); border-radius: 8px; padding: 10px 12px; background: var(--card); }
summary { cursor: pointer; font-weight: 600; }
pre { white-space: pre-wrap; word-break: break-word; font-size: 0.8125rem; max-height: 220px; overflow: auto; margin: 0; }

.notice { margin: 16px 0; padding: 12px 14px; border-radius: 8px; background: var(--note-bg); }
.error { color: var(--danger); margin: 16px 0 0; }
.ticket { font: 600 1.5rem/1.2 ui-monospace, SFMono-Regular, Menlo, monospace; letter-spacing: 0.04em; }
#ts { margin-top: 20px; }

/* Honeypot: kept off-screen, not display:none, so simple bots still fill it. */
.trap { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }