/* duy_thuc_graph.css - Knowledge Graph Triet Hoc Duy Thuc */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:       #080d1a;
  --surface:  #0d1426;
  --card:     #131e35;
  --hover:    #1e2d4a;
  --border:   #1a2540;
  --border2:  #253660;
  --text:     #e2e8f0;
  --muted:    #7c8fa8;
  --dim:      #3d5070;
  /* node type colors */
  --c-phil:   #f97316;
  --c-con:    #8b5cf6;
  --c-cat:    #06b6d4;
  --c-sch:    #10b981;
  --c-per:    #f59e0b;
  --c-stg:    #ec4899;
  --font: 'Inter', system-ui, sans-serif;
  --tr: .15s ease;
  --header-bg: linear-gradient(90deg, #0d1426 0%, #12203d 100%);
  --canvas-bg: radial-gradient(ellipse at 30% 20%, #111b35 0%, var(--bg) 65%);
}

[data-theme="light"] {
  --bg:       #f8fafc;
  --surface:  #f1f5f9;
  --card:     #ffffff;
  --hover:    #e2e8f0;
  --border:   #cbd5e1;
  --border2:  #94a3b8;
  --text:     #0f172a;
  --muted:    #475569;
  --dim:      #64748b;
  --header-bg: var(--surface);
  --canvas-bg: radial-gradient(ellipse at 30% 20%, var(--surface) 0%, var(--bg) 65%);
}
html, body { height: 100%; overflow: hidden; background: var(--bg); color: var(--text); font-family: var(--font); }
#app { display: flex; flex-direction: column; height: 100vh; }

/* ---- Header ---- */
.dt-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 20px;
  background: var(--header-bg);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.dt-header-left { display: flex; align-items: center; gap: 12px; }
.dt-logo {
  background: linear-gradient(135deg, #f97316, #ec4899);
  color: #fff; font-weight: 800; font-size: 11px;
  padding: 5px 10px; border-radius: 8px; letter-spacing: .06em;
  white-space: nowrap;
}
.dt-title { font-size: 14px; font-weight: 700; color: var(--text); }
.dt-subtitle { font-size: 11px; color: var(--muted); }
.dt-stats { display: flex; gap: 8px; }
.stat-badge {
  font-size: 11px; padding: 3px 10px; border-radius: 20px;
  background: var(--card); border: 1px solid var(--border2);
  color: var(--muted); font-weight: 600;
}
.stat-badge.accent { color: #06b6d4; border-color: #06b6d444; }

/* ---- Controls ---- */
.dt-controls {
  display: flex; align-items: center; gap: 12px;
  padding: 6px 16px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0; flex-wrap: wrap;
}
.dt-filter-group { display: flex; align-items: center; gap: 5px; flex-wrap: wrap; }
.filter-label { font-size: 10px; color: var(--dim); text-transform: uppercase; letter-spacing: .07em; white-space: nowrap; }
.filter-btn, .rel-btn {
  background: transparent; border: 1px solid var(--border2);
  color: var(--muted); font-size: 10px; padding: 3px 9px;
  border-radius: 20px; cursor: pointer; font-family: var(--font);
  transition: var(--tr);
}
.filter-btn:hover, .rel-btn:hover { background: var(--hover); color: var(--text); }
.filter-btn.active { background: var(--c-con); border-color: var(--c-con); color: #fff; }
.rel-btn.active { background: var(--card); border-color: var(--border2); color: var(--text); }

.dt-actions { display: flex; align-items: center; gap: 8px; margin-left: auto; }
.action-btn {
  background: var(--card); border: 1px solid var(--border2);
  color: var(--muted); font-size: 10px; padding: 3px 10px;
  border-radius: 6px; cursor: pointer; font-family: var(--font);
  transition: var(--tr);
}
.action-btn:hover { background: var(--hover); color: var(--text); }
.toggle-label { display: flex; align-items: center; gap: 4px; font-size: 10px; color: var(--muted); cursor: pointer; }
.toggle-label input { accent-color: var(--c-con); cursor: pointer; }

/* ---- Toast Notification ---- */
.ai-toast {
  display: inline-block;
  padding: 4px 10px;
  background: rgba(139, 92, 246, 0.2);
  color: #c4b5fd;
  border: 1px solid rgba(139, 92, 246, 0.4);
  border-radius: 6px;
  font-size: 10px;
  font-weight: 600;
  opacity: 0;
  transform: translateY(-5px);
  transition: opacity 0.3s, transform 0.3s;
  pointer-events: none;
}
.ai-toast.show {
  opacity: 1;
  transform: translateY(0);
}

/* ---- Search ---- */
.dt-search-bar {
  position: relative; flex-shrink: 0;
  padding: 5px 16px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}
.dt-search {
  width: 280px; background: var(--card); border: 1px solid var(--border2);
  color: var(--text); font-family: var(--font); font-size: 11px;
  padding: 5px 10px; border-radius: 6px; outline: none;
  transition: var(--tr);
}
.dt-search:focus { border-color: var(--c-con); }
.dt-search::placeholder { color: var(--dim); }
.search-results {
  position: absolute; top: 100%; left: 16px; z-index: 100;
  background: var(--card); border: 1px solid var(--border2);
  border-radius: 8px; min-width: 280px; max-height: 240px;
  overflow-y: auto; box-shadow: 0 8px 24px rgba(0,0,0,.5);
  display: none;
}
.search-results.open { display: block; }
.search-item {
  padding: 7px 12px; font-size: 11px; color: var(--muted); cursor: pointer;
  display: flex; align-items: center; gap: 8px; transition: var(--tr);
}
.search-item:hover { background: var(--hover); color: var(--text); }
.si-dot { width: 8px; height: 8px; border-radius: 50%; flex-shrink: 0; }

/* ---- Canvas ---- */
.dt-canvas-wrapper {
  flex: 1; position: relative; overflow: hidden;
  background: var(--canvas-bg);
}
#dtSvg { width: 100%; height: 100%; }

/* ---- Tooltip ---- */
.dt-tooltip {
  position: absolute; pointer-events: none;
  background: var(--surface); border: 1px solid var(--border2);
  border-radius: 10px; padding: 10px 14px; min-width: 200px; max-width: 280px;
  box-shadow: 0 8px 24px rgba(0,0,0,.6);
  opacity: 0; transform: translateY(4px);
  transition: opacity .12s, transform .12s; z-index: 50;
}
.dt-tooltip.visible { opacity: 1; transform: translateY(0); }
.tt-header { display: flex; align-items: center; gap: 8px; margin-bottom: 5px; }
.tt-type { font-size: 9px; text-transform: uppercase; letter-spacing: .07em; padding: 2px 6px; border-radius: 4px; font-weight: 700; }
.tt-name { font-size: 12px; font-weight: 600; color: var(--text); }
.tt-rel { font-size: 10px; color: var(--muted); margin-bottom: 3px; }
.tt-note { font-size: 10px; color: var(--dim); font-style: italic; }

/* ---- Legend ---- */
.dt-legend {
  position: absolute; bottom: 20px; left: 16px;
  background: var(--surface); border: 1px solid var(--border2);
  border-radius: 10px; padding: 10px 14px; min-width: 185px;
  font-size: 10px; backdrop-filter: blur(8px);
}
.legend-title { font-size: 9px; text-transform: uppercase; letter-spacing: .08em; color: var(--dim); margin-bottom: 5px; font-weight: 700; }
.legend-item { display: flex; align-items: center; gap: 6px; color: var(--muted); margin-bottom: 3px; }
.ldot { width: 9px; height: 9px; border-radius: 50%; flex-shrink: 0; }
.legend-sep { border-top: 1px solid var(--border2); margin: 6px 0; }
.legend-edge { display: flex; align-items: center; gap: 6px; color: var(--muted); margin-bottom: 3px; }
.eline { display: inline-block; width: 20px; height: 2px; }
.eline.edge-dash { background: repeating-linear-gradient(90deg,currentColor 0,currentColor 4px,transparent 4px,transparent 8px) !important; }

/* ---- Info box ---- */
.dt-infobox {
  position: absolute; top: 16px; right: 16px; width: 300px;
  background: var(--surface); border: 1px solid var(--border2);
  border-radius: 12px; box-shadow: 0 8px 32px rgba(0,0,0,.6);
  backdrop-filter: blur(12px); display: none; z-index: 40;
}
.dt-infobox.open { display: block; }
.ib-header {
  display: flex; align-items: center; gap: 8px;
  padding: 12px 14px 8px; border-bottom: 1px solid var(--border);
}
.ib-badge {
  font-size: 9px; text-transform: uppercase; letter-spacing: .07em;
  padding: 2px 7px; border-radius: 4px; font-weight: 700;
}
.ib-header strong { font-size: 13px; font-weight: 700; color: var(--text); flex: 1; min-width: 0; word-break: break-word; }
.ib-close { background: transparent; border: none; color: var(--dim); cursor: pointer; font-size: 15px; margin-left: auto; flex-shrink: 0; transition: var(--tr); }
.ib-close:hover { color: var(--text); }
.ib-body { padding: 12px 14px; max-height: 340px; overflow-y: auto; }
.ib-section { margin-bottom: 12px; }
.ib-section-title { font-size: 9px; text-transform: uppercase; letter-spacing: .07em; color: var(--dim); font-weight: 700; margin-bottom: 5px; }
.ib-link-item {
  display: flex; align-items: center; gap: 6px;
  padding: 5px 8px; background: var(--card); border-radius: 6px;
  margin-bottom: 3px; font-size: 10px; color: var(--muted);
  cursor: pointer; transition: var(--tr);
}
.ib-link-item:hover { background: var(--hover); color: var(--text); }
.ib-dot { width: 7px; height: 7px; border-radius: 50%; flex-shrink: 0; }
.ib-rel-tag { margin-left: auto; font-size: 9px; color: var(--dim); white-space: nowrap; }

/* ---- D3 elements ---- */
.node-g { cursor: pointer; }
.node-circle { transition: filter .15s; }
.node-circle:hover { filter: brightness(1.3) drop-shadow(0 0 6px currentColor); }
.node-label { pointer-events: none; user-select: none; font-family: var(--font); fill: var(--text-primary); }

/* ---- Loading Spinner for AI Expand ---- */
@keyframes nodePulse {
  0% { r: 10px; stroke-width: 2px; opacity: 1; }
  100% { r: 40px; stroke-width: 0px; opacity: 0; }
}
.node-g.is-loading .node-circle {
  animation: pulseColor 1s infinite alternate;
}
@keyframes pulseColor {
  from { filter: brightness(1); }
  to { filter: brightness(1.5) drop-shadow(0 0 10px currentColor); }
}
.node-spinner {
  fill: none; stroke: currentColor; opacity: 0; pointer-events: none;
}
.node-g.is-loading .node-spinner {
  animation: nodePulse 1.5s infinite ease-out;
}


/* ---- Scrollbar ---- */
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border2); border-radius: 2px; }