:root {
  --bg: #f5f7f6;
  --card: #ffffff;
  --text: #1c2421;
  --muted: #5f6b66;
  --line: #dfe5e2;
  --primary: #0f766e;
  --primary-text: #ffffff;
  --danger: #b42318;
  --ok-bg: #e7f6ef;
  --ok-text: #11643f;
  --err-bg: #fdecea;
  --err-text: #9b1c13;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #101513;
    --card: #19201d;
    --text: #e8eeeb;
    --muted: #9aa8a2;
    --line: #2b3531;
    --primary: #2bb3a3;
    --primary-text: #062621;
    --danger: #ff8a7a;
    --ok-bg: #12301f;
    --ok-text: #8fe0b4;
    --err-bg: #3a1714;
    --err-text: #ffb4a9;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "PingFang TC", "Noto Sans TC", "Microsoft JhengHei", sans-serif;
  -webkit-text-size-adjust: 100%;
}

.wrap {
  max-width: 480px;
  margin: 0 auto;
  padding: max(16px, env(safe-area-inset-top)) 16px max(24px, env(safe-area-inset-bottom));
}

.top { display: flex; align-items: center; gap: 12px; margin: 8px 0 20px; }
.logo { width: 48px; height: 48px; border-radius: 12px; }
h1 { font-size: 1.5rem; margin: 0; line-height: 1.2; }
h2 { font-size: 1.2rem; margin: 0 0 8px; }
h3 { font-size: 1rem; margin: 0 0 4px; }
.sub, .muted { color: var(--muted); margin: 0; }
.sub { font-size: .9rem; }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 20px;
  margin-bottom: 16px;
}

.btn {
  display: block;
  width: 100%;
  min-height: 48px;
  margin-top: 16px;
  padding: 12px 16px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: transparent;
  color: var(--text);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}
.btn.primary { background: var(--primary); border-color: var(--primary); color: var(--primary-text); }
.btn.danger { color: var(--danger); }
.btn:disabled { opacity: .5; cursor: default; }
.actions .btn + .btn { margin-top: 10px; }

.info { display: grid; grid-template-columns: auto 1fr; gap: 6px 16px; margin: 12px 0 0; }
.info dt { color: var(--muted); }
.info dd { margin: 0; overflow-wrap: anywhere; }

.field { display: block; margin-top: 16px; }
.field span { display: block; color: var(--muted); font-size: .9rem; margin-bottom: 6px; }
.field input {
  width: 100%;
  min-height: 48px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--bg);
  color: var(--text);
  font: inherit;
  font-size: 16px; /* prevents iOS zoom on focus */
}

.hint { color: var(--muted); font-size: .9rem; margin: 12px 0 0; }
a { color: var(--primary); }
hr { border: 0; border-top: 1px solid var(--line); margin: 24px 0 16px; }
.steps { padding-left: 1.2em; margin: 8px 0 0; }
.steps li + li { margin-top: 6px; }

.message { border-radius: 12px; padding: 12px 16px; margin: 0 0 16px; }
.message[data-kind="error"] { background: var(--err-bg); color: var(--err-text); }
.message[data-kind="ok"] { background: var(--ok-bg); color: var(--ok-text); }

.foot { color: var(--muted); font-size: .85rem; text-align: center; margin-top: 8px; }