:root {
  --bg: #f9fafb;
  --bg-accent: #eef2f7;
  --card: #ffffff;
  --card-border: #e5e7eb;
  --text: #2f353a;
  --text-secondary: #4b5563;
  --muted: #6b7280;
  --accent: #52adc8;
  --accent-hover: #3a97b3;
  --accent-soft: #eef8fc;
  --accent-border: #cfe8f1;
  --success-bg: #ecfdf5;
  --success-text: #047857;
  --success-border: #a7f3d0;
  --pill-bg: #f7f8fa;
  --pill-border: #e5e7eb;
  --error-bg: #fef2f2;
  --error-text: #b91c1c;
  --shadow-sm: 0 1px 1px rgba(17, 24, 39, 0.06);
  --shadow-md: 0 8px 22px rgba(17, 24, 39, 0.06);
  --radius-card: 8px;
  --radius-control: 6px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  background-color: var(--bg);
  font-family: -apple-system, ".SFNSText-Regular", "San Francisco", "Roboto", "Segoe UI", "Helvetica Neue", "Lucida Grande", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

.page {
  max-width: 860px;
  margin: 0 auto;
  padding: 26px 18px 40px;
}

.site-head {
  margin-bottom: 18px;
  text-align: center;
}

.site-title {
  margin: 0 0 8px;
  font-size: clamp(1.45rem, 3.6vw, 1.95rem);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text);
}

.site-sub {
  margin: 0;
  font-size: 15px;
  color: var(--muted);
  font-weight: 400;
}

.card {
  margin-bottom: 14px;
  padding: 20px 20px 22px;
  border-radius: var(--radius-card);
  background: var(--card);
  border: 1px solid var(--card-border);
  box-shadow: var(--shadow-sm);
}

.title {
  margin: 0 0 12px;
  font-size: 18px;
  font-weight: 600;
  letter-spacing: 0;
  color: var(--text-secondary);
}

.title-inline {
  margin-bottom: 0;
}

.subtle {
  color: var(--muted);
  font-size: 14px;
  line-height: 1.55;
}

.query-row,
.dual-row,
.result-head {
  display: flex;
  gap: 10px;
  align-items: center;
}

.result-head {
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

.btn-like {
  height: 42px;
  padding: 0 13px;
  border-radius: var(--radius-control);
  border: 1px solid #d1d5db;
  background: #fff;
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0;
  transition: border-color 0.15s ease, background 0.15s ease, transform 0.1s ease;
}

.btn-like:hover {
  border-color: #9ca3af;
  background: #fbfbfc;
}

.btn-like:focus-visible {
  outline: 2px solid #a5d8e8;
  outline-offset: 2px;
}

.btn-like:active {
  transform: translateY(1px);
}

select.btn-like {
  flex: 1;
  min-width: 0;
}

.native-select-hidden {
  position: absolute;
  opacity: 0;
  pointer-events: none;
  width: 1px;
  height: 1px;
}

.custom-select-wrap {
  position: relative;
  flex: 1;
  min-width: 0;
}

.custom-select-trigger {
  width: 100%;
  text-align: left;
  cursor: pointer;
}

.custom-select-trigger::after {
  content: "▾";
  float: right;
  opacity: 0.65;
  font-size: 12px;
}

.custom-select-wrap.open .custom-select-trigger::after {
  content: "▴";
}

.custom-select-menu {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  right: 0;
  z-index: 20;
  max-height: 220px;
  overflow-y: auto;
  padding: 6px;
  border: 1px solid #d1d5db;
  border-radius: 6px;
  background: #fff;
  box-shadow: 0 10px 24px rgba(17, 24, 39, 0.12);
}

.custom-select-option {
  width: 100%;
  border: none;
  background: transparent;
  color: var(--text);
  text-align: left;
  border-radius: 8px;
  padding: 10px 12px;
  font-size: 14px;
  cursor: pointer;
  transition: background 0.12s ease;
}

.custom-select-option:hover {
  background: #f3f4f6;
}

.custom-select-option:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: -2px;
}

.btn-action {
  cursor: pointer;
  flex: 0 0 auto;
}

#runBtn.btn-like {
  min-width: 96px;
  border: 1px solid transparent;
  background: var(--accent);
  color: #fff;
  box-shadow: none;
}

#runBtn.btn-like:hover {
  background: var(--accent-hover);
}

#runBtn.btn-like:focus-visible {
  outline-color: #9dd4e6;
}

#runBtn.btn-like:disabled {
  opacity: 0.65;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

#clearBtn.btn-like {
  background: #fff;
  color: var(--text-secondary);
  border-color: #d1d5db;
}

#clearBtn.btn-like:hover {
  background: #f9fafb;
  border-color: #9ca3af;
}

#addDualBtn.btn-like {
  background: #fff;
  color: var(--text-secondary);
  border-color: #d1d5db;
}

#targetsPreview {
  margin-top: 16px;
}

.chips-wrap,
.tags-wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 12px;
  border-radius: 6px;
  background: var(--pill-bg);
  border: 1px solid var(--pill-border);
  font-size: 14px;
  color: var(--text);
  transition: border-color 0.15s ease, background 0.15s ease;
}

.chip:hover {
  background: #f8fafc;
  border-color: #cbd5e1;
}

.chip input {
  accent-color: var(--accent);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 12px;
  border-radius: 999px;
  background: #f3f9fc;
  border: 1px solid #d8ebf2;
  color: #2f6e82;
  font-size: 13px;
  font-weight: 500;
}

.tag.dual {
  background: var(--success-bg);
  border-color: var(--success-border);
  color: var(--success-text);
}

.tag button {
  border: none;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-size: 16px;
  line-height: 1;
  padding: 0 0 0 2px;
  border-radius: 4px;
  transition: color 0.12s ease;
}

.tag button:hover {
  color: var(--text-secondary);
}

.error {
  margin: 16px 0 0;
  padding: 12px 14px;
  border-radius: 6px;
  background: var(--error-bg);
  color: var(--error-text);
  font-size: 14px;
  border: 1px solid #fecaca;
}

/* 与「不支持双属性攻击方」同源提示：黄色警告条 */
.hint-banner {
  margin: 16px 0 0;
  padding: 12px 14px;
  border-radius: 6px;
  background: #fffbeb;
  color: #92400e;
  font-size: 14px;
  line-height: 1.5;
  border: 1px solid #fde68a;
}

/* 结果标签区与上方「结果」标题行 / 错误提示留出间距 */
#resultWrap {
  margin-top: 16px;
  min-height: 8px;
}

.hidden {
  display: none;
}

@media (max-width: 680px) {
  .page {
    padding: 18px 12px 32px;
  }

  .site-head {
    margin-bottom: 18px;
  }

  .card {
    padding: 16px 14px 18px;
    margin-bottom: 12px;
    border-radius: 8px;
  }

  .query-row,
  .dual-row,
  .result-head {
    gap: 10px;
  }

  .query-row,
  .dual-row {
    flex-wrap: wrap;
  }

  .dual-row {
    flex-wrap: nowrap;
  }

  .btn-like {
    height: 40px;
    padding: 0 12px;
    border-radius: 6px;
    font-size: 13px;
  }

  .dual-row .btn-action {
    margin-bottom: 0;
  }

  .custom-select-menu {
    max-height: 180px;
  }

  .title {
    margin-bottom: 12px;
    font-size: 16px;
  }

  .chips-wrap,
  .tags-wrap {
    gap: 8px;
  }

  .chip,
  .tag {
    font-size: 13px;
  }

  .chip {
    padding: 8px 10px;
  }

  .tag {
    padding: 6px 10px;
  }
}