/* 极简移动端样式：系统字体、无框架、无外链资源 */
:root {
  --bg: #f6f7f9;
  --card: #ffffff;
  --line: #e5e7eb;
  --text: #111827;
  --muted: #6b7280;
  --brand: #2563eb;
  --ok: #16a34a;
  --err: #dc2626;
  --radius: 12px;
}

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.5 -apple-system, BlinkMacSystemFont, "PingFang SC", "Helvetica Neue", Arial, sans-serif;
}

body {
  min-height: 100dvh;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 24px 16px calc(24px + env(safe-area-inset-bottom));
}

.card {
  width: 100%;
  max-width: 420px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px 18px;
}

.title { margin: 0 0 4px; font-size: 19px; font-weight: 600; }
.sub { margin: 0 0 18px; font-size: 13px; color: var(--muted); }

.notice {
  margin: 0 0 16px;
  padding: 9px 12px;
  font-size: 12px;
  line-height: 1.6;
  color: #92400e;
  background: #fffbeb;
  border: 1px solid #fde68a;
  border-radius: 10px;
}
.notice.err { color: var(--err); background: #fef2f2; border-color: #fecaca; }

.field { margin-bottom: 14px; }
.field label { display: block; font-size: 13px; color: var(--muted); margin-bottom: 6px; }

.row { display: flex; gap: 8px; }

input {
  flex: 1 1 auto;
  min-width: 0;
  height: 44px;
  padding: 0 12px;
  font-size: 16px; /* 低于 16px 会触发 iOS 自动缩放 */
  color: var(--text);
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 10px;
  outline: none;
  appearance: none;
}
input:focus { border-color: var(--brand); }
input:disabled { background: #f3f4f6; color: #9ca3af; }

.btn {
  flex: 0 0 auto;
  height: 44px;
  padding: 0 14px;
  font-size: 14px;
  font-weight: 500;
  color: #fff;
  background: var(--brand);
  border: 1px solid var(--brand);
  border-radius: 10px;
  cursor: pointer;
  white-space: nowrap;
}
.btn.ghost { background: #fff; color: var(--brand); }
.btn:disabled { background: #d1d5db; border-color: #d1d5db; color: #fff; cursor: not-allowed; }
.btn.ghost:disabled { background: #f3f4f6; color: #9ca3af; border-color: var(--line); }

.timer { margin-top: 8px; font-size: 12px; color: var(--muted); }
.timer.warn { color: var(--err); }

.status {
  margin-top: 4px;
  padding: 10px 12px;
  font-size: 13px;
  color: var(--muted);
  background: #f9fafb;
  border: 1px solid var(--line);
  border-radius: 10px;
}

.result { margin-top: 14px; }
.result h2 { margin: 0 0 10px; font-size: 16px; font-weight: 600; }
.result.ok h2 { color: var(--ok); }
.result.err h2 { color: var(--err); }
.result .kv { display: flex; justify-content: space-between; gap: 12px; padding: 7px 0; font-size: 13px; border-bottom: 1px dashed var(--line); }
.result .kv:last-child { border-bottom: 0; }
.result .kv span:first-child { color: var(--muted); flex: 0 0 auto; }
.result .kv span:last-child { text-align: right; word-break: break-all; }
.result .msg { margin-top: 8px; font-size: 13px; line-height: 1.6; color: var(--muted); }
.result.err .msg { color: var(--err); }
.result pre {
  margin: 10px 0 0;
  padding: 10px;
  max-height: 240px;
  overflow: auto;
  font-size: 12px;
  line-height: 1.5;
  background: #f9fafb;
  border: 1px solid var(--line);
  border-radius: 10px;
  white-space: pre-wrap;
  word-break: break-all;
}

.toast {
  position: fixed;
  left: 50%;
  bottom: 32px;
  transform: translate(-50%, 12px);
  max-width: 86vw;
  padding: 10px 16px;
  font-size: 14px;
  color: #fff;
  background: rgba(17, 24, 39, .92);
  border-radius: 10px;
  opacity: 0;
  pointer-events: none;
  transition: opacity .18s, transform .18s;
  z-index: 9;
}
.toast.on { opacity: 1; transform: translate(-50%, 0); }
.toast.err { background: rgba(220, 38, 38, .94); }

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1115;
    --card: #171a21;
    --line: #2a2f3a;
    --text: #e5e7eb;
    --muted: #9ca3af;
  }
  input { background: #11141a; }
  input:disabled { background: #1b1f27; color: #6b7280; }
  .btn.ghost { background: #11141a; }
  .btn.ghost:disabled { background: #1b1f27; }
  .status, .result pre { background: #11141a; }
}