:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --bg: #f4f7fb;
  --card: #ffffff;
  --text: #1e293b;
  --muted: #64748b;
  --green: #059669;
  --red: #dc2626;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg); color: var(--text); line-height: 1.6;
}
.top {
  display: flex; justify-content: space-between; align-items: center;
  padding: 14px 20px; background: var(--card); border-bottom: 1px solid #e2e8f0;
}
.logo { font-size: 20px; font-weight: 700; color: var(--primary); }
.slogan { color: var(--muted); font-size: 13px; }
main { max-width: 760px; margin: 0 auto; padding: 24px 16px 60px; }
.hero h1 { font-size: 26px; margin-bottom: 10px; }
.hero .sub { color: var(--muted); margin-bottom: 24px; }
.card {
  background: var(--card); border-radius: 12px; padding: 22px;
  margin-bottom: 18px; box-shadow: 0 1px 3px rgba(0,0,0,.06);
}
.card h2 { font-size: 17px; margin-bottom: 14px; color: var(--primary-dark); }
.dropzone {
  border: 2px dashed #cbd5e1; border-radius: 10px; padding: 40px 20px;
  text-align: center; cursor: pointer; transition: .2s;
}
.dropzone:hover, .dropzone.drag { border-color: var(--primary); background: #eff6ff; }
.dropzone p:first-child { font-size: 16px; }
.hint { color: var(--muted); font-size: 13px; margin-top: 6px; }
.hint.center { text-align: center; }
.fileinfo { margin-top: 12px; font-size: 14px; color: var(--green); }
.presets { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-bottom: 16px; }
.preset {
  padding: 10px 6px; border: 1.5px solid #e2e8f0; border-radius: 8px;
  background: #fff; cursor: pointer; font-size: 14px; line-height: 1.4;
}
.preset small { color: var(--muted); }
.preset.on { border-color: var(--primary); background: #eff6ff; }
.manual { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 16px; font-size: 14px; align-items: center; }
.manual label { display: flex; align-items: center; gap: 6px; }
.manual .chk { cursor: pointer; }
.manual input[type="checkbox"] { width: auto; }
.manual input {
  width: 90px; padding: 6px 8px; border: 1px solid #cbd5e1; border-radius: 6px;
}
.bgcolor { margin-bottom: 18px; font-size: 14px; }
.bgbtn {
  padding: 6px 14px; margin: 0 4px 4px 0; border: 1.5px solid #e2e8f0;
  border-radius: 20px; background: #fff; cursor: pointer; font-size: 13px;
}
.bgbtn.on { border-color: var(--primary); background: #eff6ff; }
.primary {
  width: 100%; padding: 14px; font-size: 16px; font-weight: 600;
  color: #fff; background: var(--primary); border: none; border-radius: 10px;
  cursor: pointer;
}
.primary:hover { background: var(--primary-dark); }
.primary.locked { background: var(--green); }
.primary:disabled { opacity: .6; cursor: wait; }
.compare { display: flex; align-items: center; gap: 12px; margin-bottom: 14px; }
.shot { flex: 1; text-align: center; }
.shot img {
  width: 100%; max-width: 220px; border: 1px solid #e2e8f0;
  border-radius: 8px; display: block; margin: 0 auto 6px;
}
.shot span { font-size: 13px; color: var(--muted); }
.arrow { font-size: 22px; color: var(--muted); }
.resultmsg { font-size: 15px; margin-bottom: 16px; }
.resultmsg.ok { color: var(--green); font-weight: 600; }
.resultmsg.bad { color: var(--red); }
.seo { color: var(--muted); font-size: 14px; }
.seo h2 { font-size: 18px; color: var(--text); margin: 24px 0 10px; }
.seo h3 { font-size: 15px; color: var(--text); margin: 18px 0 8px; }
.seo table { width: 100%; border-collapse: collapse; margin: 10px 0; font-size: 13px; }
.seo td, .seo th { border: 1px solid #e2e8f0; padding: 6px 10px; text-align: left; }
.seo th { background: #f1f5f9; }
.foot { text-align: center; padding: 20px; color: var(--muted); font-size: 13px; }
.modal {
  position: fixed; inset: 0; background: rgba(15,23,42,.6);
  display: flex; align-items: center; justify-content: center; z-index: 100; padding: 16px;
}
.modal-box {
  background: #fff; border-radius: 14px; padding: 24px; max-width: 360px;
  width: 100%; max-height: 92vh; overflow-y: auto; text-align: center;
}
.modal-box h3 { margin-bottom: 12px; }
.amount { font-size: 15px; margin-bottom: 12px; }
.amount b { color: var(--red); font-size: 22px; }
.warn { color: var(--red); }
.qr { width: 200px; height: 200px; object-fit: contain; margin: 8px auto; border: 1px solid #e2e8f0; border-radius: 8px; }
.paysteps { text-align: left; margin: 12px 0 16px; padding-left: 20px; font-size: 14px; }
.paysteps li { margin-bottom: 6px; }
.verifymsg { font-size: 14px; margin: 12px 0; min-height: 20px; }
.verifymsg.ok { color: var(--green); font-weight: 600; }
.verifymsg.bad { color: var(--red); }
.linkbtn { background: none; border: none; color: var(--muted); cursor: pointer; margin-top: 10px; text-decoration: underline; }
.hidden { display: none !important; }

/* 卡密兑换区 */
.keybox {
  margin-top: 16px; padding: 14px; border: 1.5px dashed #cbd5e1;
  border-radius: 10px; background: #f8fafc;
}
.keytitle { font-size: 13px; color: var(--muted); margin-bottom: 8px; }
.keyrow { display: flex; gap: 8px; }
.keyrow input {
  flex: 1; padding: 10px 12px; border: 1px solid #cbd5e1;
  border-radius: 8px; font-size: 14px; text-transform: uppercase;
}
.keyrow button {
  padding: 10px 22px; border: none; border-radius: 8px;
  background: var(--primary); color: #fff; font-weight: 600; cursor: pointer;
}
.keyrow button:hover { background: var(--primary-dark); }
@media (max-width: 480px) {
  .presets { grid-template-columns: repeat(2, 1fr); }
  .hero h1 { font-size: 21px; }
}