:root {
  --card: #ffffff;
  --text: #101828;
  --muted: #667085;
  --brand: #4f46e5;
  --brand-soft: #eef2ff;
  --line: #e4e7ec;
  --shadow: 0 8px 22px rgba(16, 24, 40, 0.08);
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background: linear-gradient(180deg, #eef2ff 0%, #f8fafc 45%, #f4f7ff 100%);
  color: var(--text);
  -webkit-tap-highlight-color: transparent;
}
.wrap {
  max-width: 720px;
  margin: 0 auto;
  min-height: 100vh;
  padding: 12px 12px calc(16px + env(safe-area-inset-bottom));
}
.site-title {
  position: sticky;
  top: 8px;
  z-index: 5;
  margin-bottom: 10px;
  text-align: center;
  color: #312e81;
  letter-spacing: 0.4px;
  background: linear-gradient(120deg, rgba(255, 255, 255, 0.92) 0%, rgba(244, 243, 255, 0.96) 100%);
  border: 1px solid rgba(196, 181, 253, 0.85);
  backdrop-filter: blur(8px);
  border-radius: 14px;
  padding: 9px 14px;
  box-shadow: 0 8px 20px rgba(79, 70, 229, 0.14), inset 0 1px 0 rgba(255, 255, 255, 0.72);
}
.site-title .brand {
  font-weight: 800;
  font-size: 18px;
  color: #4338ca;
}
.site-title .dot {
  display: inline-block;
  margin: 0 6px;
  color: #7c3aed;
  font-size: 16px;
  transform: translateY(-1px);
}
.site-title .slogan {
  font-weight: 500;
  font-size: 13px;
  color: #6d28d9;
  opacity: 0.92;
}
.card {
  background: var(--card);
  border-radius: 16px;
  box-shadow: var(--shadow);
  padding: 14px;
  margin-bottom: 12px;
}
h1 {
  margin: 0 0 8px;
  font-size: 22px;
  line-height: 1.25;
}
h2 {
  margin: 0 0 8px;
  font-size: 18px;
  line-height: 1.3;
}
p {
  margin: 6px 0;
  line-height: 1.6;
  color: #344054;
}
.small { font-size: 13px; color: var(--muted); }
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: 1px solid #d0d5dd;
  border-radius: 999px;
  padding: 5px 10px;
  font-size: 12px;
  color: #344054;
  background: #fff;
  margin: 0 6px 6px 0;
}
.progress-wrap {
  position: sticky;
  top: 10px;
  z-index: 3;
  background: rgba(244, 247, 255, 0.84);
  backdrop-filter: blur(4px);
  border-radius: 12px;
  padding: 8px;
  margin-bottom: 10px;
}
.progress-info {
  display: flex;
  justify-content: flex-start;
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 6px;
}
.progress {
  height: 10px;
  background: #e5e7eb;
  border-radius: 999px;
  overflow: hidden;
}
.progress > i {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, #6366f1 0%, #8b5cf6 100%);
  transition: width .25s ease;
}
.question-title {
  font-size: 19px;
  margin: 10px 0 14px;
  line-height: 1.45;
}
.opts {
  display: grid;
  gap: 10px;
}
.opt {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px;
  font-size: 15px;
  line-height: 1.5;
  background: #fff;
  text-align: left;
  width: 100%;
}
.opt.active {
  border-color: var(--brand);
  background: var(--brand-soft);
  color: #2d2cb0;
  font-weight: 600;
}
.actions {
  display: flex;
  gap: 10px;
  margin-top: 14px;
}
button {
  border: 0;
  border-radius: 12px;
  min-height: 44px;
  padding: 0 14px;
  font-size: 15px;
  cursor: pointer;
  flex: 1;
}
.btn-ghost {
  background: #eef2ff;
  color: #3730a3;
}
.btn-main {
  background: var(--brand);
  color: #fff;
  font-weight: 600;
}
.btn-main:disabled {
  opacity: .45;
  cursor: not-allowed;
}
.grid {
  display: grid;
  gap: 8px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}
.dim-item {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 8px;
  font-size: 13px;
  background: #fff;
}
.bar {
  margin-top: 6px;
  width: 100%;
  height: 8px;
  border-radius: 999px;
  background: #e5e7eb;
  overflow: hidden;
}
.bar > i {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, #3b82f6 0%, #6366f1 100%);
}
.hidden { display: none; }
.result-main {
  background:
    radial-gradient(circle at 85% 10%, rgba(255, 255, 255, 0.28), transparent 38%),
    radial-gradient(circle at 10% 90%, rgba(56, 189, 248, 0.22), transparent 35%),
    linear-gradient(135deg, #1d4ed8 0%, #6d28d9 48%, #db2777 100%);
  color: #fff;
  min-height: 370px;
  border: 1px solid rgba(255, 255, 255, 0.3);
  box-shadow: 0 10px 26px rgba(76, 29, 149, 0.32);
}
.result-main p { color: rgba(255, 255, 255, 0.92); }
.result-main .share-line {
  margin-top: 8px;
  color: rgba(255, 255, 255, 0.94);
}
.code {
  font-size: 28px;
  font-weight: 800;
  letter-spacing: 1px;
  margin: 4px 0;
}
.share-line {
  font-size: 13px;
  opacity: 0.92;
}
.share-traits {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}
.share-traits span {
  font-size: 12px;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.35);
  padding: 4px 9px;
}
.qr-box {
  margin-top: 14px;
  display: flex;
  align-items: center;
  gap: 12px;
  background: rgba(255, 255, 255, 0.18);
  border: 1px solid rgba(255, 255, 255, 0.38);
  border-radius: 12px;
  padding: 8px;
}
.qr-img {
  width: 86px;
  height: 86px;
  border-radius: 8px;
  background: #fff;
  object-fit: cover;
  flex-shrink: 0;
}
.qr-tip-wrap {
  flex: 1;
}
.qr-tip {
  font-size: 13px;
  line-height: 1.45;
  color: rgba(255, 255, 255, 0.98);
  font-weight: 600;
}
.qr-tip-sub {
  margin-top: 4px;
  font-size: 12px;
  color: rgba(255, 255, 255, 0.88);
  line-height: 1.4;
}
.qr-tip-sub .arrow {
  display: inline-block;
  margin-right: 4px;
  font-weight: 700;
  color: rgba(255, 255, 255, 0.98);
}
.footnote {
  font-size: 12px;
  color: #6b7280;
  text-align: center;
  margin: 14px 8px 0;
  line-height: 1.5;
}
@media (max-width: 420px) {
  h1 { font-size: 20px; }
  .question-title { font-size: 17px; }
  .grid { grid-template-columns: 1fr; }
  .result-main { min-height: 350px; }
  .qr-img {
    width: 76px;
    height: 76px;
  }
}