:root {
  --bg-primary: #f5f5f5;
  --bg-secondary: #ffffff;
  --bg-header: #111111;
  --text-primary: #111111;
  --text-secondary: #666666;
  --border-color: #dddddd;
  --accent: #111111;
  --accent-hover: #333333;
  --accent-soft: rgba(0,0,0,0.05);
  --btn-open: #222222;
  --btn-open-hover: #000000;
  --shadow: 0 1px 4px rgba(0,0,0,0.08);
  --shadow-hover: 0 4px 16px rgba(0,0,0,0.14);
}

.dark-mode {
  --bg-primary: #0a0a0a;
  --bg-secondary: #161616;
  --bg-header: #000000;
  --text-primary: #f0f0f0;
  --text-secondary: #888888;
  --border-color: #2a2a2a;
  --accent: #f0f0f0;
  --accent-hover: #ffffff;
  --accent-soft: rgba(255,255,255,0.05);
  --btn-open: #e0e0e0;
  --btn-open-hover: #ffffff;
  --shadow: 0 1px 4px rgba(0,0,0,0.5);
  --shadow-hover: 0 4px 16px rgba(0,0,0,0.7);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: 'Segoe UI', system-ui, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  transition: background 0.3s, color 0.3s;
  min-height: 100vh;
}

/* ── Header ── */
.header {
  background: var(--bg-header);
  color: #fff;
  padding: 14px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: 0 2px 8px rgba(0,0,0,0.3);
  position: sticky;
  top: 0;
  z-index: 100;
}
.header-left { display: flex; align-items: center; gap: 12px; }
.logo { font-size: 24px; }
.header h1 { font-size: 20px; font-weight: 700; letter-spacing: 0.4px; color: #ffffff; }
.theme-toggle {
  background: transparent;
  color: #ccc;
  border: 1px solid #444;
  padding: 7px 16px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: all 0.2s;
}
.theme-toggle:hover { border-color: #aaa; color: #fff; }

/* ── Main ── */
.main-content {
  max-width: 960px;
  margin: 0 auto;
  padding: 28px 20px 60px;
}

/* ── Add Tool Panel ── */
.add-tool-panel {
  background: var(--bg-secondary);
  border-radius: 12px;
  padding: 22px 24px;
  margin-bottom: 22px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border-color);
}
.add-tool-panel h2 {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
  text-transform: uppercase;
  letter-spacing: 0.6px;
}
.form-grid {
  display: grid;
  grid-template-columns: 1fr 1.4fr 1fr auto;
  gap: 10px;
  align-items: center;
}
.form-grid input,
.form-grid select {
  padding: 10px 13px;
  border: 1.5px solid var(--border-color);
  border-radius: 7px;
  font-size: 14px;
  background: var(--bg-primary);
  color: var(--text-primary);
  outline: none;
  transition: border-color 0.2s;
}
.form-grid input:focus,
.form-grid select:focus { border-color: var(--text-primary); }
.form-grid select option { background: var(--bg-secondary); }
#addToolBtn {
  background: var(--accent);
  color: var(--bg-secondary);
  border: none;
  padding: 10px 20px;
  border-radius: 7px;
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 7px;
  white-space: nowrap;
  transition: background 0.2s, transform 0.15s;
}
#addToolBtn:hover { background: var(--accent-hover); transform: translateY(-1px); }
#addToolBtn:active { transform: translateY(0); }

/* ── Controls ── */
.controls-panel {
  display: flex;
  gap: 14px;
  margin-bottom: 18px;
  flex-wrap: wrap;
  align-items: center;
}
.search-box {
  flex: 1;
  min-width: 200px;
  position: relative;
  display: flex;
  align-items: center;
}
.search-box i {
  position: absolute;
  left: 13px;
  color: var(--text-secondary);
  font-size: 13px;
  pointer-events: none;
}
.search-box input {
  width: 100%;
  padding: 10px 14px 10px 36px;
  border: 1.5px solid var(--border-color);
  border-radius: 7px;
  font-size: 14px;
  background: var(--bg-secondary);
  color: var(--text-primary);
  outline: none;
  transition: border-color 0.2s;
}
.search-box input:focus { border-color: var(--text-primary); }
.filter-box select {
  padding: 10px 14px;
  border: 1.5px solid var(--border-color);
  border-radius: 7px;
  font-size: 14px;
  background: var(--bg-secondary);
  color: var(--text-primary);
  outline: none;
  cursor: pointer;
}

/* ── Tools Header ── */
.tools-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
  padding: 0 4px;
}
#toolCount { font-size: 13px; color: var(--text-secondary); font-weight: 700; }
.drag-hint { font-size: 12px; color: var(--text-secondary); display: flex; align-items: center; gap: 6px; opacity: 0.6; }

/* ── Tool Row ── */
.tools-list { display: flex; flex-direction: column; gap: 8px; }
.tool-row {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 13px 16px;
  display: grid;
  grid-template-columns: 36px 1fr auto auto auto;
  align-items: center;
  gap: 14px;
  box-shadow: var(--shadow);
  transition: all 0.2s;
  cursor: grab;
  user-select: none;
}
.tool-row:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-1px);
  border-color: var(--text-primary);
}
.tool-row:active { cursor: grabbing; }
.tool-row.dragging { opacity: 0.4; border: 2px dashed var(--text-secondary); }
.tool-row.drag-over { border: 2px solid var(--text-primary); background: var(--accent-soft); }

/* Drag Disabled State */
.tool-row.drag-disabled { cursor: default; }
.tool-row.drag-disabled:active { cursor: default; }
.tool-row.drag-disabled:hover { transform: none; box-shadow: var(--shadow); }

.tool-number {
  width: 32px;
  height: 32px;
  background: var(--accent);
  color: var(--bg-secondary);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 700;
  flex-shrink: 0;
}
.tool-info { display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.tool-name { font-weight: 600; font-size: 15px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.tool-url { font-size: 11px; color: var(--text-secondary); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

/* ── Category Badge ── */
.category-badge {
  padding: 5px 11px;
  border-radius: 5px;
  font-size: 11px;
  font-weight: 700;
  white-space: nowrap;
  flex-shrink: 0;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.cat-ai { background: rgba(16, 163, 127, 0.15); color: #0a7c5a; border: 1px solid rgba(16, 163, 127, 0.3); }
.cat-work { background: rgba(0, 102, 255, 0.15); color: #0052cc; border: 1px solid rgba(0, 102, 255, 0.3); }
.cat-news { background: rgba(255, 140, 0, 0.15); color: #cc7000; border: 1px solid rgba(255, 140, 0, 0.3); }
.cat-other { background: var(--accent-soft); color: var(--text-secondary); border: 1px solid var(--border-color); }

.dark-mode .cat-ai { color: #20c997; }
.dark-mode .cat-work { color: #66b3ff; }
.dark-mode .cat-news { color: #ffb366; }

/* ── Action Buttons ── */
.btn-open {
  background: var(--btn-open);
  color: var(--bg-secondary);
  border: none;
  padding: 8px 16px;
  border-radius: 7px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all 0.2s;
  white-space: nowrap;
}
.btn-open:hover { background: var(--btn-open-hover); transform: translateY(-1px); }

.btn-delete {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  padding: 8px 12px;
  border-radius: 7px;
  cursor: pointer;
  transition: all 0.2s;
}
.btn-delete:hover { background: #ff4444; color: #ffffff; border-color: #ff4444; transform: translateY(-1px); }

.dark-mode .btn-open { color: #111; }

/* ── Empty State ── */
.empty-state { text-align: center; padding: 60px 20px; color: var(--text-secondary); }
.empty-state i { font-size: 48px; margin-bottom: 16px; display: block; opacity: 0.25; }
.empty-state p { font-size: 15px; }

/* ── Toast ── */
.toast {
  position: fixed;
  bottom: 28px;
  right: 28px;
  background: #111;
  color: #fff;
  padding: 12px 20px;
  border-radius: 8px;
  font-size: 14px;
  display: flex;
  align-items: center;
  gap: 10px;
  box-shadow: 0 6px 24px rgba(0,0,0,0.3);
  transform: translateY(20px);
  opacity: 0;
  transition: all 0.3s cubic-bezier(.175,.885,.32,1.275);
  z-index: 9999;
  max-width: 320px;
  border-left: 3px solid #fff;
}
.toast.show { transform: translateY(0); opacity: 1; }
.toast-error { border-left: 3px solid #ff4444; }

/* ── Responsive ── */
@media (max-width: 768px) {
  .form-grid { grid-template-columns: 1fr; }
  #addToolBtn { grid-column: span 1; justify-content: center; }
  .tool-row { 
    grid-template-columns: 30px 1fr auto; 
    grid-template-rows: auto auto auto; 
    gap: 8px; 
  }
  .category-badge { grid-row: 2; grid-column: 2; justify-self: start; }
  .btn-open { grid-row: 1; grid-column: 3; }
  .btn-delete { grid-row: 2; grid-column: 3; }
  .btn-text { display: none; } /* Hide "Open" text on mobile to save space */
  .header { padding: 12px 16px; }
  .header h1 { font-size: 17px; }
  .main-content { padding: 18px 12px 50px; }
  .controls-panel { flex-direction: column; align-items: stretch; }
}

/* ── Dark Mode ── */
.dark-mode .tool-number { background: #2a2a2a; color: #dddddd; border: 1px solid #444444; }
.dark-mode .btn-open { background: #1e1e1e; color: #cccccc; border: 1.5px solid #444444; }
.dark-mode .btn-open:hover { background: #2e2e2e; color: #ffffff; border-color: #888888; transform: translateY(-1px); }
.dark-mode #addToolBtn { background: #2a2a2a; color: #dddddd; border: 1.5px solid #555555; }
.dark-mode #addToolBtn:hover { background: #383838; color: #ffffff; border-color: #888888; }
.dark-mode .filter-box select { border-color: #444; }

/* ── Export / Import Buttons ── */
.header-right { display: flex; gap: 12px; align-items: center; }
.action-btn {
  background: transparent; color: #cccccc; border: 1px solid #444444;
  width: 32px; height: 32px; border-radius: 6px; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  font-size: 14px; transition: all 0.2s;
}
.action-btn:hover { border-color: #aaaaaa; color: #ffffff; }
body.light-mode .action-btn { color: #666666; border-color: #dddddd; }
body.light-mode .action-btn:hover { color: #111111; border-color: #aaaaaa; background: rgba(0,0,0,0.05); }