#kitu-special-tool {
  --bg: #ffffff;
  --surface: #ffffff;
  --surface2: #f8fafc;
  --border: #e2e8f0;
  --text: #0f172a;
  --text-muted: #64748b;
  --accent: #009dfb;
  --accent-light: #eff6ff;
  --accent2: #f59e0b;
  --success: #16a34a;
  --success-light: #f0fdf4;
  --success-border: #bbf7d0;
  --success-text: #15803d;
  --sidebar-w: 280px;
  --radius: 12px;
  font-family: Arial, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
}

#kitu-special-tool,
#kitu-special-tool * {
  box-sizing: border-box;
}

#kitu-special-tool .mobile-cat-header,
#kitu-special-tool .mobile-cat-panel {
  display: none;
}

#kitu-special-tool .mobile-cat-toggle,
#kitu-special-tool .mobile-cat-search input,
#kitu-special-tool .mobile-cat-option {
  font-family: inherit;
}

#kitu-special-tool .kst-layout {
  max-width: 1000px;
  margin: 0 auto;
  padding: 32px 15px;
  display: grid;
  grid-template-columns: var(--sidebar-w) minmax(0, 1fr);
  gap: 32px;
  align-items: start;
}

#kitu-special-tool .kst-sidebar {
  position: sticky;
  top: 24px;
  max-height: calc(100vh - 48px);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

#kitu-special-tool .kst-sidebar-title {
  padding: 14px 16px;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-muted);
  background: var(--surface2);
  border-bottom: 1px solid var(--border);
}

#kitu-special-tool .kst-sidebar-list {
  padding: 8px 0;
  max-height: calc(100vh - 98px);
  overflow-y: auto;
}

#kitu-special-tool .kst-sidebar-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 16px;
  cursor: pointer;
  font-size: 16px;
  color: #5e5c5c;
  transition: background 0.15s, color 0.15s;
  border-left: 3px solid transparent;
  user-select: none;
  text-decoration: none;
}

#kitu-special-tool .kst-sidebar-item:hover {
  background: var(--accent-light);
  color: var(--accent);
}

#kitu-special-tool .kst-sidebar-item.active {
  background: var(--accent-light);
  color: var(--accent);
  border-left-color: var(--accent);
  font-weight: 600;
}

#kitu-special-tool .kst-sidebar-item .icon {
  font-size: 16px;
  width: 20px;
  text-align: center;
}

#kitu-special-tool .kst-sidebar-item .count {
  margin-left: auto;
  font-size: 11px;
  background: var(--surface2);
  padding: 2px 8px;
  border-radius: 20px;
  color: var(--text-muted);
}

#kitu-special-tool .kst-sidebar-item.active .count {
  background: #dbeafe;
  color: var(--accent);
}

#kitu-special-tool .kst-main {
  min-width: 0;
}

#kitu-special-tool .copy-hint {
  background: var(--success-light);
  border: 1px solid var(--success-border);
  border-radius: var(--radius);
  padding: 14px 18px;
  font-size: 16px;
  color: var(--success-text);
  margin-bottom: 28px;
  line-height: 1.5;
}

#kitu-special-tool .kst-section {
  margin-bottom: 36px;
}

#kitu-special-tool .kst-section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 16px;
}

#kitu-special-tool .kst-section-title {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
  line-height: 1.4;
}

#kitu-special-tool .kst-section-title .emoji {
  font-size: 18px;
}

#kitu-special-tool .kst-section-count {
  font-size: 13px;
  color: var(--text-muted);
  font-weight: 400;
  margin-left: 4px;
  white-space: nowrap;
}

#kitu-special-tool .show-more {
  font-size: 15px;
  color: var(--accent);
  border: none;
  background: none;
  cursor: pointer;
  font-family: inherit;
  font-weight: 500;
  padding: 6px 12px;
  border-radius: 6px;
  transition: background 0.15s;
  white-space: nowrap;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
}

#kitu-special-tool .show-more:hover {
  background: var(--accent-light);
}

#kitu-special-tool .char-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(54px, 1fr));
  gap: 8px;
}

#kitu-special-tool .char-break {
  grid-column: 1 / -1;
  height: 10px;
}

#kitu-special-tool .char-cell {
  aspect-ratio: 1;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: inherit;
  font-size: 22px;
  line-height: 1;
  color: var(--text);
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  transition: transform 0.12s, border-color 0.12s, background 0.12s, box-shadow 0.12s;
  position: relative;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  appearance: none;
  -webkit-appearance: none;
  padding: 0;
  box-shadow: none;
}

@media (hover: hover) and (pointer: fine) {
  #kitu-special-tool .char-cell:hover {
    border-color: var(--accent);
    background: var(--accent-light);
    transform: translateY(-2px) scale(1.06);
    box-shadow: 0 4px 12px rgba(37,99,235,0.12);
    z-index: 2;
  }
}

#kitu-special-tool .char-cell:active {
  transform: scale(0.95);
}

#kitu-special-tool .char-cell.copied {
  border-color: var(--success);
  background: var(--success-light);
}

#kitu-special-tool .kst-toast {
  position: fixed;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%) translateY(80px);
  background: #0f172a;
  color: #fff;
  padding: 10px 22px;
  border-radius: 24px;
  font-size: 14px;
  font-weight: 500;
  box-shadow: 0 8px 24px rgba(0,0,0,0.15);
  z-index: 999;
  transition: transform 0.3s cubic-bezier(0.34,1.56,0.64,1);
  pointer-events: none;
  display: flex;
  align-items: center;
  gap: 8px;
}

#kitu-special-tool .kst-toast.show {
  transform: translateX(-50%) translateY(0);
}

#kitu-special-tool .kst-toast .kst-toast-char {
  background: rgba(255,255,255,0.15);
  padding: 2px 10px;
  border-radius: 12px;
  font-size: 18px;
}

#kitu-special-tool .kst-divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 28px 0;
}

@media (max-width: 768px) {
  #kitu-special-tool .mobile-cat-header {
    position: sticky;
    top: 0;
    z-index: 100;
    display: flex;
    justify-content: center;
    align-items: center;
    background: #212121;
    border-radius: 5px;
    padding: 8px;
    margin-bottom: 14px;
  }

  #kitu-special-tool .mobile-cat-toggle {
    width: auto;
    max-width: 100%;
    min-width: 0;
    height: 40px;
    border: none;
    border-radius: 999px;
    background: #212121;
    color: #fff;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 7px;
    padding: 0 14px;
    box-shadow: none;
  }

  #kitu-special-tool .mobile-cat-toggle strong {
    color: var(--accent);
    font-weight: 700;
  }

  #kitu-special-tool .mobile-cat-arrow {
    color: #fff;
    font-size: 22px;
    line-height: 1;
  }

  #kitu-special-tool .kst-section {
    scroll-margin-top: 82px;
  }

  #kitu-special-tool .mobile-cat-search input {
    width: 100%;
    height: 38px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--surface2);
    color: var(--text);
    font-size: 13px;
    outline: none;
    padding: 0 10px;
  }

  #kitu-special-tool .mobile-cat-search input:focus {
    border-color: var(--accent);
    background: #fff;
  }

  #kitu-special-tool .mobile-cat-panel {
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    right: 0;
    z-index: 101;
    display: block;
    background: #ffffff;
    border: none;
    border-radius: 0 0 16px 16px;
    padding: 14px 16px 16px;
    margin: 0;
    box-shadow: 0 12px 24px rgba(15, 23, 42, 0.12);
    max-height: 62vh;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
  }

  #kitu-special-tool .mobile-cat-panel[hidden] {
    display: none;
  }

  #kitu-special-tool .mobile-cat-grid {
    display: grid;
    grid-template-columns: 1fr;
    column-gap: 16px;
    row-gap: 10px;
  }

  #kitu-special-tool .mobile-cat-option {
    min-width: 0;
    min-height: 38px;
    border: none;
    border-radius: 5px;
    background: #fff;
    color: #334155;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 2px;
    padding: 7px 10px;
    text-align: left;
    -webkit-tap-highlight-color: transparent;
    box-shadow: none;
    text-decoration: none;
  }

  #kitu-special-tool .mobile-cat-option.is-hidden {
    display: none;
  }

  #kitu-special-tool .mobile-cat-option.active {
    background: #dbeafe;
    border-color: #93c5fd;
    color: #1d4ed8;
    font-weight: 700;
  }

  #kitu-special-tool .mobile-cat-number {
    color: var(--text-muted);
    font-size: 12px;
    min-width: 20px;
    flex: 0 0 auto;
  }

  #kitu-special-tool .mobile-cat-name {
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  #kitu-special-tool .kst-layout {
    display: block;
    padding: 15px;
  }

  #kitu-special-tool .kst-sidebar {
    display: none;
  }

  #kitu-special-tool .kst-section-header {
    align-items: flex-start;
  }

  #kitu-special-tool .kst-section-title {
    flex-wrap: wrap;
    line-height: 1.4;
  }

  #kitu-special-tool .char-grid {
    grid-template-columns: repeat(auto-fill, minmax(48px, 1fr));
    gap: 8px;
  }

  #kitu-special-tool .char-cell {
    min-height: 48px;
    font-size: 28px;
  }
}

#kitu-special-tool .kst-divider {
  display: none;
}

#kitu-special-tool .kst-ad-slot {
  margin: 28px 0 36px;
}

#kitu-special-tool .kst-ad-box {
  width: 100%;
  min-height: 60px;
}