/* ─────────────────────────────────────────────────────
   Topology Builder – topology-builder.css
   ───────────────────────────────────────────────────── */

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

:root {
  --bg-900: #050813;
  --bg-800: #080d1c;
  --bg-700: #0c1327;
  --bg-card: #0e1628;
  --border: rgba(255,255,255,0.07);
  --cyan: #00d4ff;
  --purple: #7c3aed;
  --purple-light: #a78bfa;
  --green: #10b981;
  --orange: #f59e0b;
  --red: #ef4444;
  --text-100: #f0f4ff;
  --text-300: #94a3b8;
  --text-500: #64748b;
  --font: 'Inter', sans-serif;
  --mono: 'JetBrains Mono', monospace;
  --nav-h: 52px;
}

html, body {
  height: 100%; overflow: hidden;
  font-family: var(--font);
  background: var(--bg-900);
  color: var(--text-100);
}

/* ─── NAVBAR ─────────────────────────────────────── */
.tb-navbar {
  height: var(--nav-h);
  background: rgba(8,13,28,0.97);
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center; gap: 16px;
  padding: 0 12px;
  position: fixed; top: 0; left: 0; right: 0; z-index: 200;
  user-select: none;
}

.tb-nav-left {
  display: flex; align-items: center; gap: 8px;
  flex-shrink: 0;
}

.tb-nav-brand {
  display: flex; align-items: center; gap: 8px;
  text-decoration: none; color: var(--text-100);
  font-size: 1.05rem; font-weight: 800;
}
.tb-nav-brand span { color: var(--cyan); }
.tb-sep { color: var(--text-500); font-size: 1.1rem; }
.tb-page-title { font-size: 0.88rem; color: var(--text-300); font-weight: 500; }

.tb-toolbar {
  display: flex; align-items: center; gap: 4px;
  flex: 1; justify-content: center;
}

.tb-tool-group { display: flex; align-items: center; gap: 2px; }

.tb-tool {
  width: 32px; height: 32px;
  display: flex; align-items: center; justify-content: center;
  background: none; border: 1px solid transparent;
  border-radius: 7px; cursor: pointer;
  color: var(--text-300); transition: all 0.15s;
}
.tb-tool:hover { background: rgba(255,255,255,0.06); color: var(--text-100); border-color: var(--border); }
.tb-tool.active { background: rgba(0,212,255,0.12); color: var(--cyan); border-color: rgba(0,212,255,0.3); }
.tb-tool.danger:hover { background: rgba(239,68,68,0.1); color: var(--red); border-color: rgba(239,68,68,0.3); }

.tb-zoom-val {
  font-size: 0.75rem; color: var(--text-300);
  font-family: var(--mono); padding: 0 6px; min-width: 40px; text-align: center;
}

.tb-divider { width: 1px; height: 20px; background: var(--border); margin: 0 6px; }

.tb-nav-right {
  display: flex; align-items: center; gap: 6px;
  flex-shrink: 0;
}

.tb-export-btn {
  display: flex; align-items: center; gap: 6px;
  background: linear-gradient(135deg, var(--cyan), #0091b5);
  border: none; border-radius: 8px; cursor: pointer;
  color: #fff; font-family: var(--font); font-size: 0.78rem; font-weight: 600;
  padding: 6px 12px; transition: all 0.15s;
  white-space: nowrap;
}
.tb-export-btn:hover { opacity: 0.85; transform: translateY(-1px); }
.tb-export-btn.secondary {
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--border); color: var(--text-300);
}
.tb-export-btn.secondary:hover { color: var(--text-100); border-color: rgba(255,255,255,0.15); }

/* ─── LAYOUT ─────────────────────────────────────── */
.tb-layout {
  display: grid;
  grid-template-columns: 220px 1fr 240px;
  height: 100vh;
  padding-top: var(--nav-h);
}

/* ─── PALETTE ────────────────────────────────────── */
.tb-palette {
  background: var(--bg-800);
  border-right: 1px solid var(--border);
  overflow-y: auto;
  padding: 12px 0;
}
.tb-palette::-webkit-scrollbar { width: 4px; }
.tb-palette::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }

.palette-section { padding: 0 10px 16px; }

.palette-title {
  font-size: 0.68rem; font-weight: 700;
  color: var(--text-500); text-transform: uppercase; letter-spacing: 0.8px;
  padding: 8px 4px 8px; border-bottom: 1px solid var(--border);
  margin-bottom: 8px;
}

.palette-item {
  display: flex; align-items: center; gap: 10px;
  padding: 8px 8px; border-radius: 9px;
  cursor: grab; transition: all 0.15s;
  border: 1px solid transparent;
  margin-bottom: 3px;
}
.palette-item:hover {
  background: rgba(255,255,255,0.04);
  border-color: var(--border);
}
.palette-item:active { cursor: grabbing; opacity: 0.7; }
.palette-item.dragging { opacity: 0.4; }

.pi-icon {
  width: 36px; height: 36px; border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0; border: 1px solid;
}

.sp-icon {
  background: rgba(167,139,250,0.12) !important;
  border-color: rgba(167,139,250,0.4) !important;
  flex-direction: column; gap: 0;
}
.sp-label { font-size: 0.72rem; font-weight: 800; color: var(--purple-light); line-height: 1; }
.sp-db { font-size: 0.56rem; color: var(--text-500); font-family: var(--mono); }

.pi-info { display: flex; flex-direction: column; gap: 1px; min-width: 0; }
.pi-name { font-size: 0.82rem; font-weight: 600; color: var(--text-100); }
.pi-sub { font-size: 0.68rem; color: var(--text-500); }

/* Template buttons */
.tpl-btn {
  display: block; width: 100%;
  background: rgba(255,255,255,0.03); border: 1px solid var(--border);
  border-radius: 8px; padding: 8px 12px;
  color: var(--text-300); font-family: var(--font); font-size: 0.8rem;
  cursor: pointer; transition: all 0.15s; text-align: left;
  margin-bottom: 5px;
}
.tpl-btn:hover { background: rgba(0,212,255,0.06); border-color: rgba(0,212,255,0.25); color: var(--cyan); }
.tpl-btn::before { content: '⚡ '; }

/* ─── CANVAS AREA ────────────────────────────────── */
.tb-canvas-area {
  position: relative; overflow: hidden;
  background: var(--bg-900);
  cursor: default;
}

.canvas-hint {
  position: absolute; top: 50%; left: 50%; transform: translate(-50%,-50%);
  text-align: center; color: var(--text-500);
  pointer-events: none; z-index: 1;
  display: flex; flex-direction: column; align-items: center; gap: 10px;
  opacity: 0.6;
}
.canvas-hint p { font-size: 0.9rem; }
.canvas-hint .hint-sub { font-size: 0.78rem; color: var(--text-500); }
.canvas-hint.hidden { display: none; }

#svgCanvas { position: absolute; inset: 0; width: 100%; height: 100%; }

.canvas-drop-overlay {
  position: absolute; inset: 0; z-index: 5;
  pointer-events: none;
}
.canvas-drop-overlay.active {
  background: rgba(0,212,255,0.04);
  border: 2px dashed rgba(0,212,255,0.3);
  pointer-events: auto;
}

.canvas-zoom-badge {
  position: absolute; bottom: 12px; left: 12px;
  background: rgba(8,13,28,0.85); border: 1px solid var(--border);
  border-radius: 6px; padding: 4px 10px;
  font-size: 0.73rem; font-family: var(--mono); color: var(--text-500);
  pointer-events: none;
}

/* ─── MINIMAP ────────────────────────────────────── */
.minimap {
  position: absolute; bottom: 12px; right: 12px;
  width: 160px; height: 100px;
  background: rgba(8,13,28,0.9); border: 1px solid var(--border);
  border-radius: 8px; overflow: hidden;
}
#minimapCanvas { display: block; }

/* ─── PROPS PANEL ────────────────────────────────── */
.tb-props {
  background: var(--bg-800);
  border-left: 1px solid var(--border);
  display: flex; flex-direction: column;
  overflow: hidden;
}

.props-header {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center; justify-content: space-between;
  flex-shrink: 0;
}
.props-header h3 { font-size: 0.88rem; font-weight: 700; }
.props-type {
  font-size: 0.72rem; padding: 3px 10px; border-radius: 12px;
  background: rgba(255,255,255,0.05); border: 1px solid var(--border);
  color: var(--text-300); font-family: var(--mono);
}

.props-body { flex: 1; overflow-y: auto; padding: 14px; }
.props-body::-webkit-scrollbar { width: 4px; }
.props-body::-webkit-scrollbar-thumb { background: var(--border); }

.props-empty {
  text-align: center; color: var(--text-500);
  padding: 40px 20px;
  display: flex; flex-direction: column; align-items: center; gap: 10px;
}
.props-empty svg { opacity: 0.3; }
.props-empty p { font-size: 0.82rem; }

/* Props form */
.prop-group { margin-bottom: 14px; }
.prop-label {
  font-size: 0.7rem; font-weight: 700; color: var(--text-500);
  text-transform: uppercase; letter-spacing: 0.4px; margin-bottom: 5px;
  display: block;
}
.prop-input {
  width: 100%; background: rgba(255,255,255,0.04);
  border: 1px solid var(--border); border-radius: 8px; outline: none;
  color: var(--text-100); font-family: var(--font); font-size: 0.85rem;
  padding: 8px 10px; transition: all 0.15s;
}
.prop-input:focus { border-color: rgba(0,212,255,0.4); }

.prop-row { display: flex; gap: 8px; }
.prop-row .prop-input { flex: 1; }

.prop-color-row { display: flex; gap: 8px; align-items: center; }
.prop-color-swatch {
  width: 32px; height: 32px; border-radius: 6px; border: 1px solid var(--border);
  cursor: pointer; flex-shrink: 0;
}
.prop-color-swatch input[type=color] {
  opacity: 0; width: 100%; height: 100%; cursor: pointer; border: none;
}

.prop-select {
  width: 100%; background: rgba(255,255,255,0.04);
  border: 1px solid var(--border); border-radius: 8px; outline: none;
  color: var(--text-100); font-family: var(--font); font-size: 0.85rem;
  padding: 8px 10px; cursor: pointer;
}
.prop-select option { background: var(--bg-800); }

.prop-btn {
  width: 100%; background: rgba(255,255,255,0.05);
  border: 1px solid var(--border); border-radius: 8px;
  color: var(--text-300); font-family: var(--font); font-size: 0.82rem;
  padding: 8px; cursor: pointer; transition: all 0.15s;
  margin-top: 4px;
}
.prop-btn:hover { background: rgba(0,212,255,0.08); color: var(--cyan); border-color: rgba(0,212,255,0.3); }

.prop-info-box {
  background: rgba(0,212,255,0.05); border: 1px solid rgba(0,212,255,0.15);
  border-radius: 8px; padding: 10px 12px; margin-bottom: 12px;
}
.prop-info-box .info-row { display: flex; justify-content: space-between; font-size: 0.78rem; margin-bottom: 4px; }
.prop-info-box .info-label { color: var(--text-500); }
.prop-info-box .info-val { font-family: var(--mono); color: var(--cyan); font-weight: 600; }

/* Loss section */
.props-loss {
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}
.loss-header {
  padding: 10px 14px;
  font-size: 0.75rem; font-weight: 700; color: var(--text-300);
  display: flex; align-items: center; gap: 6px;
  background: rgba(0,212,255,0.04);
}
.loss-body { padding: 10px 14px 14px; }
.loss-row {
  display: flex; justify-content: space-between;
  font-size: 0.78rem; padding: 4px 0;
  border-bottom: 1px solid rgba(255,255,255,0.03);
}
.loss-row .lr-label { color: var(--text-500); }
.loss-row .lr-val { font-family: var(--mono); color: var(--text-100); font-weight: 600; }
.loss-row.total { border-bottom: none; padding-top: 8px; }
.loss-row.total .lr-label { color: var(--text-300); }
.loss-row.total .lr-val { color: var(--cyan); font-size: 0.9rem; }

/* ─── NODE STYLES (SVG) ──────────────────────────── */
.node-rect {
  cursor: move;
  transition: filter 0.15s;
}
.node-group:hover .node-rect { filter: url(#shadow-selected); }

/* Port rings (glow background) – hidden by default */
.port-ring {
  opacity: 0;
  transition: opacity 0.15s, r 0.15s;
}
.node-group:hover .port-ring { opacity: 1; }

/* Port dots – hidden until hover */
.port-dot {
  cursor: crosshair;
  opacity: 0;
  transition: opacity 0.1s, r 0.15s;
}
.node-group:hover .port-dot { opacity: 1; }
.port-dot:hover { r: 7px; }

/* While a connect is in-progress – show all ports brighter */
body.connecting .port-dot { opacity: 0.6; }
body.connecting .node-group:hover .port-dot { opacity: 1; }
body.connecting .node-group:hover .port-ring { opacity: 1; }

/* Connecting cursor */
body.connecting { cursor: crosshair !important; }

.edge-line {
  stroke-linecap: round;
  cursor: pointer;
  transition: stroke 0.15s, stroke-width 0.15s;
}
.edge-line:hover { stroke-width: 3; }

.edge-label {
  font-family: 'Inter', sans-serif;
  font-size: 11px;
  fill: rgba(148,163,184,0.9);
  text-anchor: middle;
  pointer-events: none;
  dominant-baseline: middle;
}

/* Selection handles */
.sel-handle {
  cursor: pointer;
  fill: var(--cyan);
  stroke: rgba(5,8,19,0.8);
  stroke-width: 2;
}

/* ─── CONTEXT MENU ───────────────────────────────── */
.ctx-menu {
  position: fixed; z-index: 1000;
  background: rgba(8,13,28,0.97);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 10px; padding: 6px;
  min-width: 160px;
  box-shadow: 0 16px 48px rgba(0,0,0,0.6);
  backdrop-filter: blur(20px);
  display: none;
  animation: ctxFade 0.12s ease;
}
@keyframes ctxFade { from { opacity:0; transform: scale(0.95); } to { opacity:1; transform: scale(1); } }

.ctx-item {
  display: flex; align-items: center; gap: 8px;
  width: 100%; background: none; border: none;
  color: var(--text-300); font-family: var(--font); font-size: 0.82rem;
  padding: 8px 10px; border-radius: 6px; cursor: pointer; text-align: left;
  transition: all 0.1s;
}
.ctx-item:hover { background: rgba(255,255,255,0.05); color: var(--text-100); }
.ctx-item.danger:hover { background: rgba(239,68,68,0.1); color: var(--red); }
.ctx-sep { height: 1px; background: var(--border); margin: 4px 0; }

/* ─── MODAL ──────────────────────────────────────── */
.modal-overlay {
  position: fixed; inset: 0; z-index: 500;
  background: rgba(5,8,19,0.75); backdrop-filter: blur(8px);
  display: flex; align-items: center; justify-content: center;
}
.modal {
  background: var(--bg-700); border: 1px solid rgba(255,255,255,0.1);
  border-radius: 16px; padding: 28px; min-width: 320px;
  box-shadow: 0 24px 64px rgba(0,0,0,0.6);
  animation: ctxFade 0.2s ease;
}
.modal h4 { font-size: 1rem; font-weight: 700; margin-bottom: 16px; }
.modal-input {
  width: 100%; background: rgba(255,255,255,0.05);
  border: 1px solid var(--border); border-radius: 9px; outline: none;
  color: var(--text-100); font-family: var(--font); font-size: 0.95rem;
  padding: 10px 14px; margin-bottom: 12px; transition: all 0.15s;
}
.modal-input:focus { border-color: rgba(0,212,255,0.4); }
.modal-row {
  display: flex; align-items: center; gap: 10px;
  margin-bottom: 16px; flex-wrap: wrap;
}
.modal-row input[type=color] {
  width: 36px; height: 36px; border-radius: 6px; border: 1px solid var(--border);
  cursor: pointer; background: none; padding: 2px;
}
.modal-row input[type=number] {
  background: rgba(255,255,255,0.05); border: 1px solid var(--border);
  border-radius: 7px; color: var(--text-100); font-family: var(--mono);
  font-size: 0.85rem; padding: 6px 8px; outline: none;
}
.modal-row label { font-size: 0.78rem; color: var(--text-500); }
.modal-actions { display: flex; gap: 8px; justify-content: flex-end; }
.modal-btn {
  padding: 8px 20px; border-radius: 9px; border: none; cursor: pointer;
  font-family: var(--font); font-size: 0.88rem; font-weight: 600;
  transition: all 0.15s;
}
.modal-btn.primary { background: linear-gradient(135deg, var(--cyan), #0091b5); color: #fff; }
.modal-btn.primary:hover { opacity: 0.85; }
.modal-btn.secondary {
  background: rgba(255,255,255,0.05); border: 1px solid var(--border); color: var(--text-300);
}
.modal-btn.secondary:hover { color: var(--text-100); }

/* ─── DRAG GHOST ─────────────────────────────────── */
.drag-ghost {
  position: fixed; pointer-events: none; z-index: 999;
  opacity: 0.85; transform: scale(0.9);
  border-radius: 10px; padding: 8px 14px;
  font-size: 0.8rem; font-weight: 600;
  background: rgba(0,212,255,0.15); border: 1px solid rgba(0,212,255,0.4);
  color: var(--cyan); backdrop-filter: blur(10px);
  transition: none;
}

/* ─── SELECTION RUBBER BAND ──────────────────────── */
#selRect {
  fill: rgba(0,212,255,0.05);
  stroke: rgba(0,212,255,0.5);
  stroke-width: 1;
  stroke-dasharray: 4,3;
  display: none;
  pointer-events: none;
}

/* ─── EDGE STYLE BADGES ──────────────────────────── */
.edge-badge {
  cursor: pointer;
  pointer-events: all;
}

/* ─── RESPONSIVE ─────────────────────────────────── */
@media (max-width: 1100px) {
  .tb-layout { grid-template-columns: 200px 1fr 200px; }
}
@media (max-width: 800px) {
  .tb-layout { grid-template-columns: 180px 1fr; }
  .tb-props { display: none; }
}