#tool-body {
  --primary: #1a7a8c;
  --primary-deep: #145f6d;
  --ink: #2a241c;
  --ink-soft: #5c5348;
  --paper: #f7f1e6;
  --paper-deep: #efe6d6;
  --line: rgba(42, 36, 28, 0.12);
  --panel: rgba(255, 252, 246, 0.88);
  --shadow: 0 18px 48px rgba(74, 48, 24, 0.1);
  --radius: 14px;
  --font-display: 'STXingkai', '华文行楷', 'FZKai-Z03', 'KaiTi', 'STKaiti', 'Songti SC', serif;
  --font-body: 'Songti SC', 'STSong', 'SimSun', 'Noto Serif SC', 'Georgia', serif;
  position: relative;
  color: var(--ink);
  font-family: var(--font-body);
  padding: 8px 4px 24px;
  overflow: hidden;
  border-radius: 12px;
}

.theme-dark-mode #tool-body {
  --primary: #3db8c9;
  --primary-deep: #7dd3de;
  --ink: #f0e8dc;
  --ink-soft: #c9bfb0;
  --paper: #1c1915;
  --paper-deep: #26211b;
  --line: rgba(240, 232, 220, 0.12);
  --panel: rgba(34, 29, 24, 0.92);
  --shadow: 0 18px 48px rgba(0, 0, 0, 0.35);
}

#tool-body::before {
  content: '';
  position: absolute;
  inset: -40px -20px auto;
  height: 280px;
  background:
    radial-gradient(ellipse 70% 80% at 15% 20%, rgba(26, 122, 140, 0.18), transparent 60%),
    radial-gradient(ellipse 50% 60% at 90% 10%, rgba(40, 90, 110, 0.12), transparent 55%),
    linear-gradient(180deg, var(--paper-deep), transparent);
  pointer-events: none;
  z-index: 0;
}

#tool-body::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 3px,
      rgba(42, 36, 28, 0.015) 3px,
      rgba(42, 36, 28, 0.015) 4px
    );
  pointer-events: none;
  z-index: 0;
  opacity: 0.6;
}

.theme-dark-mode #tool-body::after {
  background-image:
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 3px,
      rgba(255, 255, 255, 0.02) 3px,
      rgba(255, 255, 255, 0.02) 4px
    );
}

#tool-body > * {
  position: relative;
  z-index: 1;
}

#tool-body .bg-hero {
  text-align: center;
  padding: 28px 12px 18px;
  animation: bg-fade-up 0.7s ease both;
}

#tool-body .bg-brand {
  display: inline-block;
  font-family: var(--font-display);
  font-size: clamp(28px, 5vw, 42px);
  letter-spacing: 0.08em;
  color: var(--ink);
  line-height: 1.25;
  margin-bottom: 10px;
}

#tool-body .bg-brand span {
  color: var(--primary);
}

#tool-body .bg-sub {
  max-width: 520px;
  margin: 0 auto;
  font-size: 14px;
  color: var(--ink-soft);
  line-height: 1.7;
  letter-spacing: 0.02em;
}

#tool-body .bg-stage {
  max-width: 860px;
  margin: 0 auto;
  padding: 0 8px;
}

#tool-body .bg-panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  backdrop-filter: blur(8px);
  padding: 22px 22px 18px;
  animation: bg-fade-up 0.75s ease 0.08s both;
}

#tool-body .bg-field-label {
  display: block;
  font-size: 13px;
  color: var(--ink-soft);
  margin-bottom: 8px;
  letter-spacing: 0.06em;
}

#tool-body .bg-topic-row {
  display: flex;
  gap: 10px;
  align-items: stretch;
  margin-bottom: 18px;
}

#tool-body .bg-topic-row .layui-input {
  flex: 1;
  height: 44px;
  border-radius: 10px;
  border-color: var(--line);
  background: rgba(255, 255, 255, 0.55);
  font-size: 16px;
  font-family: var(--font-body);
  color: var(--ink);
}

.theme-dark-mode #tool-body .bg-topic-row .layui-input {
  background: rgba(0, 0, 0, 0.25);
}

#tool-body .bg-topic-row .layui-input:focus {
  border-color: var(--primary) !important;
}

#tool-body .bg-shuffle {
  width: 44px;
  min-width: 44px;
  height: 44px;
  padding: 0;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--ink-soft);
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s, transform 0.2s;
}

#tool-body .bg-shuffle:hover {
  color: var(--primary);
  border-color: var(--primary);
  transform: rotate(-12deg);
}

#tool-body .bg-len-group {
  margin-bottom: 8px;
}

#tool-body .bg-len-options {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

#tool-body .bg-len-options .layui-form-radio {
  margin: 0 !important;
  padding: 0 !important;
}

#tool-body .bg-len-options .layui-form-radio > i {
  display: none !important;
}

#tool-body .bg-len-options .layui-form-radio > div {
  margin: 0 !important;
  padding: 8px 14px !important;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--ink-soft);
  font-size: 13px;
  line-height: 1.2;
  transition: all 0.2s ease;
}

#tool-body .bg-len-options .layui-form-radioed > div,
#tool-body .bg-len-options .layui-form-radio:hover > div {
  border-color: var(--primary);
  color: var(--primary);
  background: rgba(26, 122, 140, 0.08);
}

#tool-body .layui-form-switch {
  margin-top: 0 !important;
}

#tool-body .bg-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
  align-items: center;
}

#tool-body .bg-btn-main {
  background: var(--primary) !important;
  border-radius: 10px !important;
  height: 42px;
  line-height: 42px;
  padding: 0 28px;
  font-size: 15px;
  letter-spacing: 0.06em;
  box-shadow: 0 8px 20px rgba(26, 122, 140, 0.28);
  transition: transform 0.2s, box-shadow 0.2s;
}

#tool-body .bg-btn-main:hover {
  background: var(--primary-deep) !important;
  transform: translateY(-1px);
  box-shadow: 0 10px 24px rgba(26, 122, 140, 0.35);
}

#tool-body .bg-btn-ghost {
  border-radius: 10px !important;
  height: 42px;
  line-height: 42px;
  border-color: var(--line) !important;
  color: var(--ink-soft) !important;
  background: transparent !important;
}

#tool-body .bg-btn-ghost:hover {
  border-color: var(--primary) !important;
  color: var(--primary) !important;
}

#tool-body .bg-advanced {
  margin-top: 16px;
  border-top: 1px dashed var(--line);
  padding-top: 4px;
}

#tool-body .bg-advanced-toggle {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 0 6px;
  background: none;
  border: none;
  color: var(--ink-soft);
  font-size: 13px;
  cursor: pointer;
  font-family: inherit;
  letter-spacing: 0.04em;
  transition: color 0.2s;
}

#tool-body .bg-advanced-toggle:hover,
#tool-body .bg-advanced-toggle.is-open {
  color: var(--primary);
}

#tool-body .bg-advanced-toggle i {
  transition: transform 0.25s ease;
  font-size: 12px;
}

#tool-body .bg-advanced-toggle.is-open i {
  transform: rotate(180deg);
}

#tool-body .bg-advanced-body {
  display: none;
  padding: 8px 0 4px;
  animation: bg-fade-up 0.35s ease both;
}

#tool-body .bg-advanced-body.is-open {
  display: block;
}

#tool-body .bg-adv-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px 28px;
  margin-bottom: 14px;
}

#tool-body .bg-adv-item {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 160px;
}

#tool-body .bg-adv-item > span {
  font-size: 13px;
  color: var(--ink-soft);
  white-space: nowrap;
}

#tool-body .bg-slider-wrap {
  flex: 1;
  min-width: 200px;
  max-width: 360px;
  padding: 8px 4px 0;
}

#tool-body .bg-custom-len {
  font-size: 13px;
  color: var(--primary);
  min-width: 72px;
}

#tool-body .bg-result {
  max-width: 860px;
  margin: 22px auto 0;
  padding: 0 8px;
  display: none;
  animation: bg-fade-up 0.55s ease both;
}

#tool-body .bg-result.is-show {
  display: block;
}

#tool-body .bg-paper {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.35), transparent 40%),
    var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 28px 28px 22px;
  position: relative;
  background-clip: padding-box, padding-box !important;
}

.theme-dark-mode #tool-body .bg-paper {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.10), transparent 40%),
    var(--paper);
}

#tool-body .bg-paper::before {
  content: '';
  position: absolute;
  left: 0;
  top: 18px;
  bottom: 18px;
  width: 3px;
  border-radius: 0 2px 2px 0;
  background: linear-gradient(180deg, var(--primary), transparent);
  opacity: 0.7;
}

#tool-body .bg-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
  flex-wrap: wrap;
}

#tool-body .bg-count {
  font-size: 12px;
  color: var(--ink-soft);
  letter-spacing: 0.04em;
}

#tool-body .bg-count em {
  font-style: normal;
  color: var(--primary);
  font-weight: 700;
}

#tool-body .bg-copy-btn {
  height: 32px !important;
  line-height: 32px !important;
  padding: 0 14px !important;
  border-radius: 8px !important;
  font-size: 13px !important;
  border-color: var(--line) !important;
  color: var(--ink-soft) !important;
  background: transparent !important;
}

#tool-body .bg-copy-btn:hover {
  border-color: var(--primary) !important;
  color: var(--primary) !important;
}

#tool-body .bg-title {
  font-family: var(--font-display);
  font-size: clamp(22px, 3.5vw, 30px);
  text-align: center;
  margin: 8px 0 22px;
  letter-spacing: 0.12em;
  line-height: 1.4;
}

#tool-body .bg-article {
  font-size: 16px;
  line-height: 1.95;
  color: var(--ink);
  text-align: justify;
}

#tool-body .bg-article p {
  margin: 0 0 1.15em;
  text-indent: 2em;
}

#tool-body .bg-article p:last-child {
  margin-bottom: 0;
}

#tool-body .bg-disclaimer {
  margin-top: 18px;
  padding: 12px 14px;
  border-radius: 10px;
  background: rgba(26, 122, 140, 0.08);
  border: 1px solid rgba(26, 122, 140, 0.18);
  color: var(--ink-soft);
  font-size: 12.5px;
  line-height: 1.7;
  letter-spacing: 0.02em;
}

#tool-body .bg-disclaimer strong {
  color: var(--primary);
  font-weight: 700;
}

#tool-body .bg-empty {
  text-align: center;
  padding: 36px 16px;
  color: var(--ink-soft);
  font-size: 14px;
}

@keyframes bg-fade-up {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media screen and (max-width: 768px) {
  #tool-body {
    padding: 0 0 16px;
    overflow: initial;
  }

  #tool-body::before {
    background: unset;
  }

  #tool-body .bg-hero {
    padding: 16px 0 12px;
    display: none;
  }

  #tool-body .bg-stage,
  #tool-body .bg-result {
    padding: 0;
    max-width: none;
  }

  #tool-body .bg-panel {
    padding: 14px 12px 12px;
    border-radius: 12px;
  }

  #tool-body .bg-paper {
    padding: 16px 12px 14px;
    border-radius: 12px;
  }

  #tool-body .bg-article {
    font-size: 15px;
    line-height: 1.85;
  }

  #tool-body .bg-actions {
    gap: 8px;
  }

  #tool-body .bg-btn-main {
    flex: 1 1 auto;
  }

  #tool-body .bg-btn-ghost {
    flex: 0 0 auto;
  }

  #tool-body .bg-len-options .layui-form-radio > div {
    padding: 7px 11px !important;
    font-size: 12px;
  }
}