:root {
  --bg: #F2F2F7;
  --surface: #FFFFFF;
  --text: #1C1C1E;
  --muted: #8E8E93;
  --primary: #007AFF;
  --success: #34C759;
  --danger: #FF3B30;
  --sep: rgba(60, 60, 67, 0.12);
  --radius: 14px;
  --page: 16px;
  --safe-bottom: env(safe-area-inset-bottom, 0px);
}
* { box-sizing: border-box; }
html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Helvetica Neue", sans-serif;
  font-size: 15px;
  line-height: 1.5;
  -webkit-tap-highlight-color: transparent;
}
a { color: var(--primary); text-decoration: none; }
main {
  max-width: 720px;
  margin: 0 auto;
  padding: var(--page);
  padding-bottom: calc(28px + var(--safe-bottom));
}
h1 { font-size: 1.45rem; margin: 0 0 6px; letter-spacing: -0.02em; }
h2 { font-size: 1.05rem; margin: 0 0 8px; }
.muted { color: var(--muted); }
.chip-row { display: flex; flex-wrap: wrap; gap: 8px; margin: 10px 0 4px; }
.chip {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(0,122,255,.12);
  color: var(--primary);
  font-size: 12px;
  font-weight: 600;
}
.chip.free { background: rgba(52,199,89,.14); color: var(--success); }
.chip.paid { background: rgba(0,122,255,.12); color: var(--primary); }
.card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 14px 16px;
  margin-top: 12px;
  box-shadow: 0 1px 0 var(--sep);
}
.card.banner {
  background: linear-gradient(145deg, #E8F1FF, #F7F7FA);
  border: 1px solid rgba(0,122,255,.12);
}
.card.banner.active {
  background: linear-gradient(145deg, #DFF6E8, #F7F7FA);
}
.banner-title { font-weight: 700; color: var(--primary); }
.card.banner.active .banner-title { color: var(--success); }
.banner-sub { margin-top: 4px; font-size: 13px; color: var(--muted); }
.field { margin-top: 12px; }
.field label {
  display: block;
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 6px;
  font-weight: 600;
}
.field input[type="text"],
.field input[type="number"],
.field input[type="file"],
.field select,
.field textarea {
  width: 100%;
  border: 0;
  background: var(--bg);
  border-radius: 12px;
  padding: 12px 14px;
  font-size: 15px;
  color: var(--text);
  outline: none;
}
.field textarea { min-height: 96px; resize: vertical; }
.field input[type="range"] { width: 100%; }
.row-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.file-box {
  border: 1.5px dashed rgba(60,60,67,.22);
  border-radius: 12px;
  padding: 18px 14px;
  text-align: center;
  background: #FAFAFC;
  cursor: pointer;
}
.file-box.drag { border-color: var(--primary); background: #F0F7FF; }
.file-box strong { display: block; margin-bottom: 4px; }
.file-list {
  margin-top: 10px;
  font-size: 13px;
  color: var(--muted);
  text-align: left;
}
.file-list div {
  padding: 6px 0;
  border-bottom: 1px solid var(--sep);
  word-break: break-all;
}
.file-list div:last-child { border-bottom: 0; }
.btn {
  display: block;
  width: 100%;
  border: 0;
  border-radius: 12px;
  padding: 14px 16px;
  margin-top: 14px;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
}
.btn:active { transform: scale(0.985); opacity: 0.92; }
.btn:disabled { opacity: 0.45; cursor: not-allowed; transform: none; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-ghost {
  background: transparent;
  color: var(--primary);
  font-weight: 600;
}
.result {
  margin-top: 12px;
  background: var(--bg);
  border-radius: 12px;
  padding: 12px 14px;
  font-size: 14px;
  white-space: pre-wrap;
  word-break: break-word;
}
.result.error {
  background: rgba(255,59,48,.08);
  color: var(--danger);
}
.result.ok { color: var(--text); }
.downloads { margin-top: 10px; display: grid; gap: 8px; }
.downloads a {
  display: block;
  text-align: center;
  background: rgba(0,122,255,.12);
  color: var(--primary);
  border-radius: 10px;
  padding: 10px 12px;
  font-weight: 600;
  font-size: 14px;
}
.hint { margin-top: 8px; font-size: 12px; color: var(--muted); }
.footer-note {
  margin-top: 18px;
  text-align: center;
  font-size: 12px;
  color: var(--muted);
}
.list-plain { margin: 0; padding-left: 18px; color: var(--muted); }
.list-plain li { margin: 6px 0; }
.kv { display: flex; justify-content: space-between; gap: 12px; padding: 10px 0; border-bottom: 1px solid var(--sep); font-size: 14px; }
.kv:last-child { border-bottom: 0; }
.kv span:last-child { color: var(--muted); text-align: right; }
.progress {
  margin-top: 10px;
  height: 6px;
  background: rgba(60,60,67,.12);
  border-radius: 999px;
  overflow: hidden;
  display: none;
}
.progress > i {
  display: block;
  height: 100%;
  width: 0%;
  background: var(--primary);
  transition: width .2s ease;
}