*, *::before, *::after { box-sizing: border-box; }

:root {
  --bg:#f0f2f5; --surface:#fff; --surface2:#e8eaee;
  --border:rgba(0,0,0,.09); --border2:rgba(0,0,0,.18);
  --text:#1a1a2e; --text2:#50506a; --text3:#6e6e8c;
  --green:#1a9e6a; --red:#d94f4f; --blue:#3a6fd8; --accent:#e8622a; --accent-h:#c94e1a; --shadow:rgba(0,0,0,.10);
}
[data-theme="dark"] {
  --bg:#0f1117; --surface:#1a1d27; --surface2:#22263a;
  --border:rgba(255,255,255,.08); --border2:rgba(255,255,255,.15);
  --text:#e8eaf0; --text2:#8b90a8; --text3:#8288a4;
  --green:#3ecf8e; --red:#f06a6a; --blue:#5b8af5; --accent:#e8622a; --accent-h:#f07340; --shadow:rgba(0,0,0,.4);
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.4;
  transition: background .2s, color .2s;
}

::-webkit-scrollbar { width:10px; height:10px; }
::-webkit-scrollbar-track { background:transparent; }
::-webkit-scrollbar-thumb { background-color:var(--border2); border-radius:8px; border:2px solid var(--bg); background-clip:padding-box; }
::-webkit-scrollbar-thumb:hover { background-color:var(--text3); }

.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 16px 20px;
}
.site-header-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.site-header h1 {
  margin: 0 0 4px;
  font-size: 1.5rem;
  color: var(--text);
}
.site-header h1 span { font-weight: 400; color: var(--text2); }
.site-header p { margin: 0; color: var(--text2); font-size: .9rem; }

#themeToggle {
  width: 34px;
  height: 34px;
  padding: 0;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
}

.tabs {
  display: flex;
  gap: 4px;
  max-width: 1200px;
  margin: 16px auto 0;
  padding: 0 20px;
}
.tab-btn {
  background: var(--surface2);
  color: var(--text2);
  border: 1px solid var(--border2);
  border-bottom: none;
  padding: 10px 18px;
  border-radius: 8px 8px 0 0;
  cursor: pointer;
  font-size: 0.95rem;
  font-weight: 500;
}
.tab-btn:hover { color: var(--text); }
.tab-btn.active {
  background: var(--surface);
  color: var(--text);
  font-weight: 700;
  box-shadow: inset 0 2px 0 var(--accent);
}

main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px 60px;
}

.tab-panel { display: none; background: var(--surface); border: 1px solid var(--border2); border-radius: 0 8px 8px 8px; padding: 20px; }
.tab-panel.active { display: block; }

.builder-layout {
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: 24px;
  align-items: start;
}
@media (max-width: 900px) {
  .builder-layout { grid-template-columns: 1fr; }
}

.filter-card {
  background: var(--surface2);
  border: 1px solid var(--border2);
  border-radius: 8px;
  margin-bottom: 14px;
  padding: 4px 14px 14px;
}
.filter-card summary {
  cursor: pointer;
  font-weight: 700;
  padding: 10px 0;
  font-size: 1.02rem;
  color: var(--accent);
}

.hint { color: var(--text3); font-size: 0.85rem; margin: 4px 0 10px; }

.field-row {
  display: flex;
  flex-wrap: wrap;
  align-items: end;
  gap: 10px;
  margin-bottom: 10px;
}
.field-row label {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 0.82rem;
  color: var(--text2);
  flex: 1 1 140px;
}
.field-row input[type=text],
.field-row input[type=number],
.field-row select {
  background: var(--surface);
  border: 1px solid var(--border2);
  color: var(--text);
  border-radius: 6px;
  padding: 8px 10px;
  font-size: 0.9rem;
  outline: none;
}
.field-row input[type=text]:focus,
.field-row input[type=number]:focus,
.field-row select:focus { border-color: var(--accent); }
.checkbox-inline {
  flex-direction: row !important;
  align-items: center;
  gap: 6px !important;
  flex: 0 0 auto !important;
}

.radio-group {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  font-size: 0.85rem;
  color: var(--text2);
}
.radio-group label { display: flex; align-items: center; gap: 5px; }

button {
  cursor: pointer;
  font: inherit;
  background: var(--surface2);
  border: 1px solid var(--border2);
  border-radius: 5px;
  color: var(--text);
  transition: background .12s;
}
button:hover { background: var(--border2); }

.btn-add {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 6px;
  padding: 9px 16px;
  font-size: 0.85rem;
  font-weight: 600;
  height: 38px;
}
.btn-add:hover { background: var(--accent-h); }
.btn-secondary {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border2);
}
.btn-secondary:hover { background: var(--border2); }

.chip-toggle-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 12px;
}
.chip-toggle {
  background: var(--surface);
  border: 1px solid var(--border2);
  color: var(--text2);
  border-radius: 999px;
  padding: 7px 14px;
  font-size: 0.82rem;
}
.chip-toggle:hover { color: var(--text); }
.chip-toggle.active {
  background: var(--accent);
  border-color: transparent;
  color: #fff;
}

.builder-output {
  position: sticky;
  top: 16px;
  background: var(--surface2);
  border: 1px solid var(--border2);
  border-radius: 8px;
  padding: 16px;
}
.builder-output h2 { margin-top: 0; font-size: 1.05rem; }
.builder-output h3 { font-size: 0.95rem; color: var(--text2); margin: 16px 0 8px; }
#output {
  width: 100%;
  resize: vertical;
  background: var(--surface);
  color: var(--accent);
  border: 1px solid var(--border2);
  border-radius: 6px;
  padding: 10px;
  font-family: "Cascadia Code", Consolas, monospace;
  font-size: 1rem;
}
.output-actions { display: flex; gap: 10px; margin-top: 10px; }
.output-actions button { flex: 1; border-radius: 6px; padding: 9px 10px; font-weight: 600; }
#btn-copy { background: var(--green); color: #fff; border: none; }
#btn-copy:hover { filter: brightness(1.08); }
#btn-clear { background: transparent; border: 1px solid var(--border2); color: var(--text); }
.output-meta { color: var(--text3); font-size: 0.78rem; margin: 8px 0 0; }

.block-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 6px; }
.block-row {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--surface);
  border: 1px solid var(--border2);
  border-radius: 6px;
  padding: 6px 8px;
  font-size: 0.85rem;
}
.block-row code { flex: 1; word-break: break-all; color: var(--text); }
.block-row.negated code { color: var(--red); }
.block-row button {
  background: transparent;
  border: 1px solid var(--border2);
  color: var(--text2);
  border-radius: 4px;
  font-size: 0.72rem;
  padding: 3px 7px;
}
.block-row button:hover { background: var(--border2); color: var(--text); }
.block-row button.active { color: var(--accent); border-color: var(--accent); }

.disclaimer { color: var(--text3); font-size: 0.75rem; margin-top: 18px; line-height: 1.5; }
.disclaimer code { background: var(--surface); border: 1px solid var(--border); padding: 1px 5px; border-radius: 4px; }

.preset-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 14px;
}
.preset-card {
  background: var(--surface2);
  border: 1px solid var(--border2);
  border-radius: 8px;
  padding: 14px;
  text-align: left;
  color: var(--text);
}
.preset-card:hover { border-color: var(--accent); }
.preset-card h4 { margin: 0 0 6px; color: var(--accent); font-size: 1rem; }
.preset-card p { margin: 0 0 8px; color: var(--text2); font-size: 0.82rem; }
.preset-card code {
  display: block;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 6px 8px;
  font-size: 0.8rem;
  color: var(--accent);
  word-break: break-all;
}

.ref-search {
  width: 100%;
  padding: 10px 12px;
  margin-bottom: 14px;
  background: var(--surface2);
  border: 1px solid var(--border2);
  color: var(--text);
  border-radius: 6px;
  font-size: 0.95rem;
  outline: none;
}
.ref-search:focus { border-color: var(--accent); }
.ref-table { width: 100%; border-collapse: collapse; font-size: 0.85rem; }
.ref-table th, .ref-table td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--border); vertical-align: top; }
.ref-table th { color: var(--text3); font-weight: 700; }
.ref-table td:nth-child(1) { color: var(--text2); white-space: nowrap; }
.ref-table td:nth-child(2) { color: var(--accent); font-family: "Cascadia Code", Consolas, monospace; white-space: nowrap; }

.site-footer {
  text-align: center;
  color: var(--text3);
  font-size: 0.78rem;
  padding: 20px;
  border-top: 1px solid var(--border);
}

/* ================= NESTED LOGIC BUILDER STYLES ================= */

.nested-intro-card {
  background: var(--surface2);
  border: 1px solid var(--border2);
  border-radius: 8px;
  padding: 14px 16px;
  margin-bottom: 14px;
}
.nested-intro-card h3 { margin: 0 0 6px; font-size: 1rem; color: var(--accent); }
.nested-intro-card p { margin: 0; font-size: 0.84rem; color: var(--text2); line-height: 1.45; }

.quick-add-bar {
  background: var(--surface2);
  border: 1px solid var(--border2);
  border-radius: 8px;
  padding: 12px 14px;
  margin-bottom: 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.quick-add-label { font-size: 0.8rem; font-weight: 700; color: var(--text3); text-transform: uppercase; letter-spacing: 0.5px; }
.quick-add-chips { display: flex; flex-wrap: wrap; gap: 6px; }
.btn-quick {
  background: var(--surface);
  border: 1px solid var(--border2);
  color: var(--text);
  border-radius: 999px;
  padding: 5px 11px;
  font-size: 0.78rem;
  font-weight: 500;
  cursor: pointer;
}
.btn-quick:hover { background: var(--accent); color: #fff; border-color: transparent; }

.quick-add-custom { display: flex; gap: 8px; margin-top: 2px; }
.quick-add-custom input {
  flex: 1;
  background: var(--surface);
  border: 1px solid var(--border2);
  color: var(--text);
  border-radius: 6px;
  padding: 6px 10px;
  font-size: 0.85rem;
}

.nested-tree-canvas {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.tree-group-card {
  background: var(--surface2);
  border: 1px solid var(--border2);
  border-left: 5px solid #3b82f6; /* Blue default for AND */
  border-radius: 8px;
  padding: 12px 14px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: all 0.2s ease;
}
.tree-group-card.op-or { border-left-color: #f59e0b; } /* Amber for OR */
.tree-group-card.negated { border-left-color: #ef4444; } /* Red for NOT */

.tree-group-card.active-target {
  box-shadow: 0 0 0 3px #3b82f6, 0 4px 18px rgba(59, 130, 246, 0.35);
  border-color: #3b82f6;
  position: relative;
}
.tree-group-card.op-or.active-target {
  box-shadow: 0 0 0 3px #f59e0b, 0 4px 18px rgba(245, 158, 11, 0.35);
  border-color: #f59e0b;
}
.tree-group-card.negated.active-target {
  box-shadow: 0 0 0 3px #ef4444, 0 4px 18px rgba(239, 68, 68, 0.35);
  border-color: #ef4444;
}

.target-indicator-banner {
  background: rgba(37, 99, 235, 0.12);
  border: 1px solid rgba(37, 99, 235, 0.35);
  border-radius: 6px;
  padding: 8px 12px;
  font-size: 0.84rem;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 8px;
}
.target-indicator-banner strong {
  color: var(--accent);
  background: rgba(37, 99, 235, 0.18);
  padding: 2px 8px;
  border-radius: 4px;
  border: 1px solid rgba(37, 99, 235, 0.3);
}

.active-target-badge {
  background: #2563eb;
  color: #fff;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 3px 9px;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  box-shadow: 0 0 8px rgba(37, 99, 235, 0.5);
  letter-spacing: 0.3px;
  animation: pulseTarget 2s infinite ease-in-out;
}
.tree-group-card.op-or .active-target-badge { background: #d97706; box-shadow: 0 0 8px rgba(217, 119, 6, 0.5); }
.tree-group-card.negated .active-target-badge { background: #dc2626; box-shadow: 0 0 8px rgba(220, 38, 38, 0.5); }

@keyframes pulseTarget {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.88; transform: scale(1.03); }
}

.target-select-btn {
  background: var(--surface);
  border: 1px dashed var(--accent);
  color: var(--accent);
  font-size: 0.72rem;
  font-weight: 600;
  padding: 3px 8px;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s ease;
}
.target-select-btn:hover {
  background: var(--accent);
  color: #fff;
  border-style: solid;
}

.tree-group-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}

.tree-group-title-area {
  display: flex;
  align-items: center;
  gap: 8px;
}

.op-switch-group {
  display: flex;
  background: var(--surface);
  border: 1px solid var(--border2);
  border-radius: 6px;
  padding: 2px;
}
.op-pill {
  background: transparent;
  border: none;
  color: var(--text2);
  font-size: 0.72rem;
  font-weight: 700;
  padding: 3px 9px;
  border-radius: 4px;
  cursor: pointer;
}
.op-pill.active.and { background: #2563eb; color: #fff; }
.op-pill.active.or { background: #d97706; color: #fff; }

.not-pill {
  background: var(--surface);
  border: 1px solid var(--border2);
  color: var(--text2);
  font-size: 0.72rem;
  font-weight: 700;
  padding: 4px 8px;
  border-radius: 6px;
  cursor: pointer;
}
.not-pill.active { background: #dc2626; color: #fff; border-color: transparent; }

.tree-group-title { font-size: 0.85rem; font-weight: 700; color: var(--text); }

.tree-actions {
  display: flex;
  align-items: center;
  gap: 4px;
}
.tree-btn {
  background: var(--surface);
  border: 1px solid var(--border2);
  color: var(--text2);
  border-radius: 4px;
  padding: 4px 8px;
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
}
.tree-btn:hover { background: var(--border2); color: var(--text); }
.tree-btn.primary { background: var(--accent); color: #fff; border-color: transparent; }
.tree-btn.primary:hover { background: var(--accent-h); }
.tree-btn.danger { color: var(--red); }
.tree-btn.danger:hover { background: rgba(239,68,68,0.15); border-color: var(--red); }

.tree-children {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-left: 10px;
  border-left: 2px dashed var(--border2);
  padding-left: 12px;
}

.tree-children-empty {
  font-size: 0.78rem;
  color: var(--text3);
  font-style: italic;
  padding: 8px 0;
}

.tree-term-node {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--surface);
  border: 1px solid var(--border2);
  border-radius: 6px;
  padding: 6px 10px;
  font-size: 0.82rem;
}
.tree-term-node.negated { border-color: rgba(239,68,68,0.4); background: rgba(239,68,68,0.06); }

.tree-term-input {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--accent);
  font-family: "Cascadia Code", Consolas, monospace;
  font-size: 0.88rem;
  outline: none;
}
.tree-term-label { font-size: 0.78rem; color: var(--text2); }

.explanation-box {
  background: rgba(37, 99, 235, 0.08);
  border: 1px solid rgba(37, 99, 235, 0.25);
  border-radius: 8px;
  padding: 12px 14px;
  margin-top: 14px;
}
.explanation-box h4 { margin: 0 0 6px; font-size: 0.85rem; color: var(--accent); }
.explanation-box p { margin: 0; font-size: 0.78rem; color: var(--text); line-height: 1.45; }

.nested-presets-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 12px;
}
.nested-preset-card {
  background: var(--surface);
  border: 1px solid var(--border2);
  border-radius: 6px;
  padding: 8px 10px;
  text-align: left;
  cursor: pointer;
  color: var(--text);
  display: flex;
  flex-direction: column;
  gap: 3px;
}
.nested-preset-card:hover { border-color: var(--accent); }
.nested-preset-card strong { font-size: 0.82rem; color: var(--accent); }
.nested-preset-card span { font-size: 0.75rem; color: var(--text2); }

/* ================= TYPE-AHEAD AUTO-SUGGEST STYLES ================= */

.autosuggest-popup {
  position: absolute;
  z-index: 9999;
  background: var(--surface2);
  border: 1px solid var(--accent);
  border-radius: 8px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4), 0 0 0 1px rgba(59, 130, 246, 0.2);
  max-height: 260px;
  overflow-y: auto;
  padding: 4px;
}

.autosuggest-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 7px 10px;
  border-radius: 5px;
  cursor: pointer;
  gap: 10px;
  transition: background 0.15s ease;
}
.autosuggest-item:hover,
.autosuggest-item.active {
  background: var(--accent);
  color: #fff;
}
.autosuggest-item:hover .autosuggest-term,
.autosuggest-item.active .autosuggest-term,
.autosuggest-item:hover .autosuggest-desc,
.autosuggest-item.active .autosuggest-desc {
  color: #fff;
}

.autosuggest-item-main {
  display: flex;
  flex-direction: column;
  gap: 2px;
  overflow: hidden;
}

.autosuggest-term {
  font-family: "Cascadia Code", Consolas, monospace;
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--accent);
}

.autosuggest-desc {
  font-size: 0.76rem;
  color: var(--text2);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.autosuggest-cat-badge {
  font-size: 0.68rem;
  font-weight: 600;
  background: var(--surface);
  border: 1px solid var(--border2);
  color: var(--text3);
  padding: 2px 6px;
  border-radius: 4px;
  white-space: nowrap;
}
.autosuggest-item:hover .autosuggest-cat-badge,
.autosuggest-item.active .autosuggest-cat-badge {
  background: rgba(255, 255, 255, 0.2);
  border-color: transparent;
  color: #fff;
}

/* ================= CREDITS & FOOTER STYLES ================= */

.credits-card {
  background: var(--surface2);
  border: 1px solid var(--border2);
  border-radius: 8px;
  padding: 16px 20px;
  margin-top: 24px;
}
.credits-card h3 { margin: 0 0 8px; font-size: 1.05rem; color: var(--accent); }
.credits-card p { margin: 0 0 10px; font-size: 0.85rem; color: var(--text2); }
.credits-card ul { margin: 0; padding-left: 20px; font-size: 0.84rem; color: var(--text2); line-height: 1.6; }
.credits-card a { color: var(--accent); text-decoration: none; font-weight: 500; }
.credits-card a:hover { text-decoration: underline; }

.credits-container {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.credits-heading { margin: 0; color: var(--text); font-size: 0.85rem; }
.credits-sources { margin: 0; color: var(--text2); font-size: 0.8rem; line-height: 1.5; }
.credits-sources a { color: var(--accent); text-decoration: none; font-weight: 500; }
.credits-sources a:hover { text-decoration: underline; }
.credits-disclaimer { margin-top: 4px; color: var(--text3); font-size: 0.75rem; line-height: 1.45; }