/* ========================================
   PB Stack Builder
   ======================================== */

#pb-stack-builder {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 20px;
  font-family: var(--pb-font-body, 'DM Sans', sans-serif);
  color: var(--pb-text, #e2e8f0);
}

/* Loading */
.pbsb-loading {
  text-align: center;
  padding: 80px 20px;
}
.pbsb-spinner {
  width: 40px; height: 40px;
  border: 3px solid rgba(59,130,246,0.15);
  border-top-color: var(--pb-blue-500, #3b82f6);
  border-radius: 50%;
  margin: 0 auto 16px;
  animation: pbsb-spin 0.8s linear infinite;
}
@keyframes pbsb-spin { to { transform: rotate(360deg); } }

/* ── Layout ── */
.pbsb-layout {
  display: grid;
  grid-template-columns: 340px 1fr;
  gap: 24px;
  align-items: start;
}
@media (max-width: 900px) {
  .pbsb-layout { grid-template-columns: 1fr; }
}

/* ── Sidebar (Peptide Library) ── */
.pbsb-sidebar {
  background: var(--pb-surface, rgba(30,41,59,0.4));
  border: 1px solid var(--pb-border, rgba(59,130,246,0.08));
  border-radius: var(--pb-radius-lg, 16px);
  overflow: hidden;
  
  
  max-height: 600px;
  display: flex;
  flex-direction: column;
}
.pbsb-sidebar-header {
  padding: 20px 20px 0;
}
.pbsb-sidebar-header h3 {
  font-size: 15px;
  font-weight: 600;
  color: var(--pb-text-heading, #f1f5f9);
  margin: 0 0 12px;
  letter-spacing: 0.02em;
}
.pbsb-search {
  width: 100%;
  background: rgba(15,23,42,0.5);
  border: 1px solid var(--pb-border, rgba(59,130,246,0.08));
  border-radius: 8px;
  padding: 10px 12px 10px 36px;
  color: var(--pb-text, #e2e8f0);
  font-size: 13px;
  font-family: inherit;
  outline: none;
  transition: border-color var(--pb-duration, 0.25s) var(--pb-ease);
}
.pbsb-search:focus {
  border-color: var(--pb-blue-500, #3b82f6);
}
.pbsb-search-wrap {
  position: relative;
}
.pbsb-search-wrap::before {
  content: '';
  position: absolute;
  left: 12px; top: 50%;
  transform: translateY(-50%);
  width: 16px; height: 16px;
  background: var(--pb-slate-500, #64748b);
  mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2'%3E%3Ccircle cx='11' cy='11' r='8'/%3E%3Cpath d='m21 21-4.35-4.35'/%3E%3C/svg%3E") center/contain no-repeat;
  -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2'%3E%3Ccircle cx='11' cy='11' r='8'/%3E%3Cpath d='m21 21-4.35-4.35'/%3E%3C/svg%3E") center/contain no-repeat;
  pointer-events: none;
}

/* Category Filters */
.pbsb-cats {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 12px 20px;
}
.pbsb-cat-btn {
  padding: 4px 10px;
  font-size: 11px;
  font-weight: 600;
  border-radius: 100px;
  border: 1px solid var(--pb-border, rgba(59,130,246,0.08));
  background: transparent;
  color: var(--pb-text-muted, #64748b);
  cursor: pointer;
  transition: all var(--pb-duration) var(--pb-ease);
  font-family: inherit;
  white-space: nowrap;
}
.pbsb-cat-btn:hover,
.pbsb-cat-btn.active {
  border-color: currentColor;
}
.pbsb-cat-btn.active { font-weight: 700; }
.pbsb-cat-btn[data-cat="Recovery"]  { color: var(--pb-cat-recovery, #34d399); }
.pbsb-cat-btn[data-cat="Recovery"].active  { background: var(--pb-cat-recovery-bg); }
.pbsb-cat-btn[data-cat="GLP-1"]    { color: var(--pb-cat-glp1, #c084fc); }
.pbsb-cat-btn[data-cat="GLP-1"].active    { background: var(--pb-cat-glp1-bg); }
.pbsb-cat-btn[data-cat="Growth"]   { color: var(--pb-cat-growth, #fbbf24); }
.pbsb-cat-btn[data-cat="Growth"].active   { background: var(--pb-cat-growth-bg); }
.pbsb-cat-btn[data-cat="Cognitive"] { color: var(--pb-cat-cognitive, #60a5fa); }
.pbsb-cat-btn[data-cat="Cognitive"].active { background: var(--pb-cat-cognitive-bg); }
.pbsb-cat-btn[data-cat="Longevity"] { color: var(--pb-cat-longevity, #f472b6); }
.pbsb-cat-btn[data-cat="Longevity"].active { background: var(--pb-cat-longevity-bg); }
.pbsb-cat-btn[data-cat="Sleep"]    { color: var(--pb-cat-sleep, #818cf8); }
.pbsb-cat-btn[data-cat="Sleep"].active    { background: var(--pb-cat-sleep-bg); }
.pbsb-cat-btn[data-cat="Lifestyle"] { color: var(--pb-cat-lifestyle, #fb7185); }
.pbsb-cat-btn[data-cat="Lifestyle"].active { background: var(--pb-cat-lifestyle-bg); }
.pbsb-cat-btn[data-cat="Skin"]     { color: var(--pb-cat-skin, #2dd4bf); }
.pbsb-cat-btn[data-cat="Skin"].active     { background: var(--pb-cat-skin-bg); }
.pbsb-cat-btn[data-cat="All"]      { color: var(--pb-blue-400, #60a5fa); }
.pbsb-cat-btn[data-cat="All"].active      { background: rgba(59,130,246,0.1); }

/* Peptide List */
.pbsb-peptide-list {
  flex: 1;
  overflow-y: auto;
  padding: 0 12px 12px;
  scrollbar-width: thin;
  scrollbar-color: rgba(59,130,246,0.2) transparent;
}
.pbsb-peptide-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 8px;
  cursor: grab;
  transition: all var(--pb-duration) var(--pb-ease);
  user-select: none;
  border: 1px solid transparent;
}
.pbsb-peptide-item:hover {
  background: var(--pb-surface-hover, rgba(30,41,59,0.6));
  border-color: var(--pb-border-hover, rgba(59,130,246,0.25));
}
.pbsb-peptide-item:active { cursor: grabbing; }
.pbsb-peptide-item.in-stack {
  opacity: 0.35;
  pointer-events: none;
}
.pbsb-peptide-item .pbsb-pill-name {
  font-size: 13px;
  font-weight: 500;
  flex: 1;
  color: var(--pb-text-heading, #f1f5f9);
}
.pbsb-cat-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}
.pbsb-cat-dot[data-cat="Recovery"]  { background: var(--pb-cat-recovery); }
.pbsb-cat-dot[data-cat="GLP-1"]    { background: var(--pb-cat-glp1); }
.pbsb-cat-dot[data-cat="Growth"]   { background: var(--pb-cat-growth); }
.pbsb-cat-dot[data-cat="Cognitive"] { background: var(--pb-cat-cognitive); }
.pbsb-cat-dot[data-cat="Longevity"] { background: var(--pb-cat-longevity); }
.pbsb-cat-dot[data-cat="Sleep"]    { background: var(--pb-cat-sleep); }
.pbsb-cat-dot[data-cat="Lifestyle"] { background: var(--pb-cat-lifestyle); }
.pbsb-cat-dot[data-cat="Skin"]     { background: var(--pb-cat-skin); }
.pbsb-add-btn {
  width: 26px; height: 26px;
  border-radius: 6px;
  border: 1px solid var(--pb-border);
  background: transparent;
  color: var(--pb-blue-400);
  font-size: 16px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all var(--pb-duration) var(--pb-ease);
  line-height: 1;
}
.pbsb-add-btn:hover {
  background: rgba(59,130,246,0.15);
  border-color: var(--pb-blue-500);
}

/* ── Main Area ── */
.pbsb-main {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

/* Preset Stacks */
.pbsb-presets {
  background: var(--pb-surface);
  border: 1px solid var(--pb-border);
  border-radius: var(--pb-radius-lg);
  padding: 20px;
}
.pbsb-presets h3 {
  font-size: 15px;
  font-weight: 600;
  color: var(--pb-text-heading);
  margin: 0 0 14px;
}
.pbsb-preset-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 10px;
}
.pbsb-preset-card {
  padding: 14px;
  border-radius: 10px;
  border: 1px solid var(--pb-border);
  background: rgba(15,23,42,0.3);
  cursor: pointer;
  transition: all var(--pb-duration) var(--pb-ease);
}
.pbsb-preset-card:hover {
  border-color: var(--pb-blue-500);
  background: rgba(37,99,235,0.06);
  transform: translateY(-1px);
}
.pbsb-preset-card h4 {
  font-size: 13px;
  font-weight: 600;
  color: var(--pb-text-heading);
  margin: 0 0 6px;
}
.pbsb-preset-card p {
  font-size: 11px;
  color: var(--pb-text-muted);
  margin: 0;
  line-height: 1.5;
}
.pbsb-preset-card .pbsb-preset-peptides {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-top: 8px;
}
.pbsb-preset-tag {
  font-size: 10px;
  padding: 2px 8px;
  border-radius: 100px;
  background: rgba(59,130,246,0.1);
  color: var(--pb-blue-400);
  font-weight: 600;
}

/* Drop Zone */
.pbsb-dropzone {
  background: var(--pb-surface);
  border: 2px dashed var(--pb-border);
  border-radius: var(--pb-radius-lg);
  padding: 24px;
  min-height: 160px;
  transition: all var(--pb-duration) var(--pb-ease);
}
.pbsb-dropzone.drag-over {
  border-color: var(--pb-blue-500);
  background: rgba(37,99,235,0.06);
  box-shadow: 0 0 30px rgba(37,99,235,0.1);
}
.pbsb-dropzone-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}
.pbsb-dropzone-header h3 {
  font-size: 15px;
  font-weight: 600;
  color: var(--pb-text-heading);
  margin: 0;
}
.pbsb-clear-btn {
  padding: 6px 14px;
  font-size: 11px;
  font-weight: 600;
  border-radius: 6px;
  border: 1px solid rgba(239,68,68,0.3);
  background: transparent;
  color: #ef4444;
  cursor: pointer;
  font-family: inherit;
  transition: all var(--pb-duration) var(--pb-ease);
}
.pbsb-clear-btn:hover {
  background: rgba(239,68,68,0.1);
}
.pbsb-stack-empty {
  text-align: center;
  padding: 30px 20px;
  color: var(--pb-text-muted);
}
.pbsb-stack-empty .pbsb-empty-icon {
  font-size: 36px;
  margin-bottom: 10px;
  opacity: 0.4;
}
.pbsb-stack-empty p {
  font-size: 13px;
  margin: 0;
}
.pbsb-stack-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.pbsb-stack-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px 8px 14px;
  border-radius: 10px;
  background: rgba(15,23,42,0.5);
  border: 1px solid var(--pb-border);
  animation: pbsb-pill-in 0.3s var(--pb-ease);
  cursor: grab;
}
.pbsb-stack-pill:active { cursor: grabbing; }
@keyframes pbsb-pill-in {
  from { opacity: 0; transform: scale(0.85); }
  to { opacity: 1; transform: scale(1); }
}
.pbsb-stack-pill .pbsb-pill-name {
  font-size: 13px;
  font-weight: 600;
  color: var(--pb-text-heading);
}
.pbsb-stack-pill .pbsb-pill-cat {
  font-size: 10px;
  padding: 2px 8px;
  border-radius: 100px;
  font-weight: 600;
}
.pbsb-stack-pill .pbsb-remove-btn {
  width: 22px; height: 22px;
  border-radius: 6px;
  border: none;
  background: rgba(239,68,68,0.1);
  color: #ef4444;
  font-size: 14px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--pb-duration) var(--pb-ease);
  line-height: 1;
}
.pbsb-stack-pill .pbsb-remove-btn:hover {
  background: rgba(239,68,68,0.25);
}
.pbsb-stack-pill .pbsb-pill-link {
  width: 22px; height: 22px;
  border-radius: 6px;
  border: none;
  background: rgba(59,130,246,0.1);
  color: var(--pb-blue-400);
  font-size: 11px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  transition: all var(--pb-duration) var(--pb-ease);
}
.pbsb-stack-pill .pbsb-pill-link:hover {
  background: rgba(59,130,246,0.25);
}

/* Category pill colors */
.cat-recovery  { background: var(--pb-cat-recovery-bg) !important; color: var(--pb-cat-recovery) !important; border-color: rgba(52,211,153,0.2) !important; }
.cat-glp-1     { background: var(--pb-cat-glp1-bg) !important; color: var(--pb-cat-glp1) !important; border-color: rgba(192,132,252,0.2) !important; }
.cat-growth    { background: var(--pb-cat-growth-bg) !important; color: var(--pb-cat-growth) !important; border-color: rgba(251,191,36,0.2) !important; }
.cat-cognitive { background: var(--pb-cat-cognitive-bg) !important; color: var(--pb-cat-cognitive) !important; border-color: rgba(96,165,250,0.2) !important; }
.cat-longevity { background: var(--pb-cat-longevity-bg) !important; color: var(--pb-cat-longevity) !important; border-color: rgba(244,114,182,0.2) !important; }
.cat-sleep     { background: var(--pb-cat-sleep-bg) !important; color: var(--pb-cat-sleep) !important; border-color: rgba(129,140,248,0.2) !important; }
.cat-lifestyle { background: var(--pb-cat-lifestyle-bg) !important; color: var(--pb-cat-lifestyle) !important; border-color: rgba(251,113,133,0.2) !important; }
.cat-skin      { background: var(--pb-cat-skin-bg) !important; color: var(--pb-cat-skin) !important; border-color: rgba(45,212,191,0.2) !important; }

/* ── Analysis Panel ── */
.pbsb-analysis {
  background: var(--pb-surface);
  border: 1px solid var(--pb-border);
  border-radius: var(--pb-radius-lg);
  padding: 24px;
  display: none;
}
.pbsb-analysis.visible { display: block; }
.pbsb-analysis h3 {
  font-size: 15px;
  font-weight: 600;
  color: var(--pb-text-heading);
  margin: 0 0 6px;
}
.pbsb-analysis-subtitle {
  font-size: 12px;
  color: var(--pb-text-muted);
  margin: 0 0 20px;
}

/* Score Bar */
.pbsb-score-section {
  margin-bottom: 24px;
}
.pbsb-score-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 8px;
}
.pbsb-score-label {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--pb-text-muted);
}
.pbsb-score-value {
  font-size: 28px;
  font-weight: 700;
  font-family: var(--pb-font-mono, monospace);
}
.pbsb-score-value.score-good { color: #34d399; }
.pbsb-score-value.score-ok   { color: #fbbf24; }
.pbsb-score-value.score-bad  { color: #ef4444; }
.pbsb-score-bar {
  height: 6px;
  border-radius: 3px;
  background: rgba(15,23,42,0.5);
  overflow: hidden;
}
.pbsb-score-bar-fill {
  height: 100%;
  border-radius: 3px;
  transition: width 0.6s var(--pb-ease), background 0.3s;
}
.pbsb-score-bar-fill.score-good { background: linear-gradient(90deg, #059669, #34d399); }
.pbsb-score-bar-fill.score-ok   { background: linear-gradient(90deg, #d97706, #fbbf24); }
.pbsb-score-bar-fill.score-bad  { background: linear-gradient(90deg, #dc2626, #ef4444); }

/* Interaction Cards */
.pbsb-interactions {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.pbsb-interaction-card {
  padding: 14px 16px;
  border-radius: 10px;
  border-left: 3px solid;
  background: rgba(15,23,42,0.3);
}
.pbsb-interaction-card.type-synergy {
  border-left-color: #34d399;
}
.pbsb-interaction-card.type-overlap {
  border-left-color: #fbbf24;
}
.pbsb-interaction-card.type-caution {
  border-left-color: #ef4444;
}
.pbsb-interaction-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 6px;
}
.pbsb-interaction-badge {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 2px 8px;
  border-radius: 4px;
}
.type-synergy .pbsb-interaction-badge { background: rgba(52,211,153,0.15); color: #34d399; }
.type-overlap .pbsb-interaction-badge { background: rgba(251,191,36,0.15); color: #fbbf24; }
.type-caution .pbsb-interaction-badge { background: rgba(239,68,68,0.15); color: #ef4444; }
.pbsb-interaction-pair {
  font-size: 13px;
  font-weight: 600;
  color: var(--pb-text-heading);
}
.pbsb-interaction-note {
  font-size: 12px;
  color: var(--pb-slate-400);
  line-height: 1.6;
  margin: 0;
}

/* Summary Stats */
.pbsb-summary-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-bottom: 20px;
}
.pbsb-stat-card {
  text-align: center;
  padding: 14px;
  border-radius: 10px;
  background: rgba(15,23,42,0.3);
  border: 1px solid var(--pb-border);
}
.pbsb-stat-num {
  font-size: 22px;
  font-weight: 700;
  font-family: var(--pb-font-mono, monospace);
}
.pbsb-stat-num.stat-synergy { color: #34d399; }
.pbsb-stat-num.stat-overlap { color: #fbbf24; }
.pbsb-stat-num.stat-caution { color: #ef4444; }
.pbsb-stat-label {
  font-size: 11px;
  color: var(--pb-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-top: 2px;
}

/* No interactions state */
.pbsb-no-interactions {
  text-align: center;
  padding: 20px;
  color: var(--pb-text-muted);
  font-size: 13px;
}

/* ── Responsive ── */
@media (max-width: 900px) {
  .pbsb-sidebar {
    position: static;
    max-height: 400px;
  }
  .pbsb-summary-stats {
    grid-template-columns: 1fr;
  }
  .pbsb-preset-grid {
    grid-template-columns: 1fr 1fr;
  }
}
@media (max-width: 600px) {
  .pbsb-preset-grid {
    grid-template-columns: 1fr;
  }
  #pb-stack-builder {
    padding: 0 12px;
  }
}