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

:root {
  --bg-deep: #0A0F1E;
  --bg-card: #1E293B;
  --bg-card-hover: #283548;
  --border: #334155;
  --text: #E2E8F0;
  --text-dim: #94A3B8;
  --accent: #00F0FF;
  --accent-dim: rgba(0,240,255,0.15);
  --danger: #EF4444;
  --success: #10B981;
  --warning: #F59E0B;
  --purple: #8B5CF6;

  /* Category colors */
  --cat-人物: #EF4444;
  --cat-项目: #3B82F6;
  --cat-架构: #8B5CF6;
  --cat-时间轴: #F59E0B;
  --cat-紧急: #EF4444;
  --cat-中期: #F59E0B;
  --cat-常规: #22C55E;
  --cat-家庭: #EC4899;
  --cat-域名: #06B6D4;
  --cat-证照: #6B7280;
}

body {
  font-family: 'Inter', sans-serif;
  background: var(--bg-deep);
  color: var(--text);
  height: 100vh;
  overflow: hidden;
  user-select: none;
  -webkit-user-select: none;
}

#app { display: flex; flex-direction: column; height: 100vh; }

/* === TOPBAR === */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  background: rgba(30,41,59,0.95);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(10px);
  z-index: 100;
  flex-shrink: 0;
  gap: 12px;
  flex-wrap: wrap;
}

.topbar-left { display: flex; align-items: center; gap: 12px; }
.logo { font-size: 16px; font-weight: 600; color: var(--accent); }
.last-sync { font-size: 11px; color: var(--text-dim); }

.topbar-right { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }

.btn-view {
  padding: 6px 14px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-dim);
  font-size: 13px;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.2s;
}
.btn-view.active {
  background: var(--accent-dim);
  border-color: var(--accent);
  color: var(--accent);
}

.btn-add {
  padding: 6px 14px;
  border-radius: 8px;
  border: none;
  background: var(--accent);
  color: #0A0F1E;
  font-size: 13px;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: opacity 0.2s;
}
.btn-add:hover { opacity: 0.85; }

/* === CONNECTIONS SVG === */
.connections {
  position: absolute;
  top: 0; left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  overflow: visible;
  z-index: 1;
}

/* === BOARD (Mindmap View) === */
.board-wrapper {
  flex: 1;
  overflow: auto;
  position: relative;
  cursor: grab;
}
.board-wrapper:active { cursor: grabbing; }

.board {
  position: relative;
  width: 2000px;
  height: 1600px;
  background-image: 
    radial-gradient(circle, rgba(51,65,85,0.4) 1px, transparent 1px);
  background-size: 40px 40px;
  overflow: visible;
  z-index: 2;
}

/* === NODES === */
.node {
  position: absolute;
  min-width: 160px;
  max-width: 280px;
  background: var(--bg-card);
  border-radius: 12px;
  padding: 12px 14px;
  cursor: move;
  border: 2px solid transparent;
  transition: box-shadow 0.2s, border-color 0.2s, transform 0.1s;
  touch-action: none;
}

.node:hover {
  box-shadow: 0 8px 32px rgba(0,0,0,0.4);
  transform: translateY(-2px);
}

.node.dragging {
  opacity: 0.9;
  box-shadow: 0 16px 48px rgba(0,0,0,0.5);
  z-index: 999;
}

.central-node {
  border: 3px solid var(--accent) !important;
  box-shadow: 0 0 24px rgba(0,240,255,0.25);
}

/* Category borders */
.node[data-cat="人物"] { border-color: var(--cat-人物); }
.node[data-cat="项目"] { border-color: var(--cat-项目); }
.node[data-cat="架构"] { border-color: var(--cat-架构); }
.node[data-cat="时间轴"] { border-color: var(--cat-时间轴); }
.node[data-cat="紧急"] { background: rgba(239,68,68,0.15); border-color: var(--cat-紧急); }
.node[data-cat="中期"] { background: rgba(245,158,11,0.12); border-color: var(--cat-中期); }
.node[data-cat="常规"] { background: rgba(34,197,94,0.1); border-color: var(--cat-常规); }
.node[data-cat="家庭"] { border-color: var(--cat-家庭); }
.node[data-cat="域名"] { border-color: var(--cat-域名); }
.node[data-cat="证照"] { border-color: var(--cat-证照); }

.node-cat {
  font-size: 11px;
  font-weight: 600;
  margin-bottom: 6px;
  opacity: 0.8;
}
.node-cat.人物 { color: var(--cat-人物); }
.node-cat.项目 { color: var(--cat-项目); }
.node-cat.架构 { color: var(--cat-架构); }
.node-cat.时间轴 { color: var(--cat-时间轴); }
.node-cat.紧急 { color: var(--cat-紧急); }
.node-cat.中期 { color: var(--cat-中期); }
.node-cat.常规 { color: var(--cat-常规); }
.node-cat.家庭 { color: var(--cat-家庭); }
.node-cat.域名 { color: var(--cat-域名); }
.node-cat.证照 { color: var(--cat-证照); }

.node-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 6px;
  line-height: 1.3;
  word-break: break-word;
}

.node-content {
  font-size: 12px;
  color: var(--text-dim);
  line-height: 1.5;
  word-break: break-word;
  white-space: pre-wrap;
  max-height: 80px;
  overflow: hidden;
}

.node-time {
  font-size: 10px;
  color: var(--text-dim);
  margin-top: 8px;
  opacity: 0.6;
}

.node.locked { opacity: 0.5; border-style: dashed; }

/* === CARD GRID VIEW === */
.card-grid {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 14px;
  align-content: start;
}

.card {
  background: var(--bg-card);
  border-radius: 12px;
  padding: 14px;
  border: 2px solid transparent;
  cursor: pointer;
  transition: all 0.2s;
}
.card:hover {
  background: var(--bg-card-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.3);
}
.card.人物 { border-color: var(--cat-人物); }
.card.项目 { border-color: var(--cat-项目); }
.card.架构 { border-color: var(--cat-架构); }
.card.时间轴 { border-color: var(--cat-时间轴); }
.card.紧急 { background: rgba(239,68,68,0.15); border-color: var(--cat-紧急); }
.card.中期 { background: rgba(245,158,11,0.12); border-color: var(--cat-中期); }
.card.常规 { background: rgba(34,197,94,0.1); border-color: var(--cat-常规); }
.card.家庭 { border-color: var(--cat-家庭); }
.card.域名 { border-color: var(--cat-域名); }
.card.证照 { border-color: var(--cat-证照); }

.card-title {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 6px;
}
.card-content {
  font-size: 12px;
  color: var(--text-dim);
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.card-cat {
  font-size: 10px;
  font-weight: 600;
  margin-bottom: 6px;
  opacity: 0.7;
}

/* === FAB === */
.fab {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: var(--accent);
  color: #0A0F1E;
  font-size: 28px;
  font-weight: 300;
  border: none;
  cursor: pointer;
  box-shadow: 0 4px 20px rgba(0,240,255,0.4);
  z-index: 1000;
  transition: transform 0.2s;
  display: none; /* shown via JS */
}
.fab:hover { transform: scale(1.1); }

/* === MODAL === */
.modal {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(10,15,30,0.85);
  z-index: 2000;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(6px);
  padding: 16px;
}
.modal.active { display: flex; }

.modal-content {
  background: var(--bg-card);
  border-radius: 16px;
  width: 100%;
  max-width: 480px;
  border: 1px solid var(--border);
  overflow: hidden;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
}
.modal-header span { font-size: 16px; font-weight: 600; }
.modal-close {
  width: 28px; height: 28px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-dim);
  cursor: pointer;
  font-size: 14px;
}

.modal-body { padding: 20px; display: flex; flex-direction: column; gap: 16px; }

.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-group label { font-size: 12px; font-weight: 600; color: var(--text-dim); text-transform: uppercase; letter-spacing: 0.5px; }
.form-group input,
.form-group select,
.form-group textarea {
  padding: 10px 12px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg-deep);
  color: var(--text);
  font-size: 14px;
  font-family: inherit;
  transition: border-color 0.2s;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent);
}
.form-group textarea { resize: vertical; min-height: 100px; }

.modal-footer {
  display: flex;
  gap: 10px;
  padding: 16px 20px;
  border-top: 1px solid var(--border);
  justify-content: flex-end;
}
.modal-footer button {
  padding: 8px 18px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: opacity 0.2s;
}
.btn-cancel {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-dim);
}
.btn-save {
  background: var(--accent);
  border: none;
  color: #0A0F1E;
}
.btn-delete {
  background: transparent;
  border: 1px solid var(--danger);
  color: var(--danger);
  margin-right: auto;
}
.btn-delete:hover { background: rgba(239,68,68,0.1); }

/* === REMOTE SYNC INDICATOR === */
.sync-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--success);
  display: inline-block;
  margin-right: 4px;
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

/* === EMPTY STATE === */
.empty-hint {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
  color: var(--text-dim);
  pointer-events: none;
}
.empty-hint h3 { font-size: 18px; margin-bottom: 8px; opacity: 0.6; }
.empty-hint p { font-size: 13px; opacity: 0.4; }

/* === MOBILE === */
@media (max-width: 640px) {
  .topbar { padding: 8px 12px; }
  .logo { font-size: 14px; }
  .btn-view, .btn-add { padding: 5px 10px; font-size: 12px; }
  .fab { display: flex; align-items: center; justify-content: center; bottom: 20px; right: 20px; }
  .board { width: 2500px; height: 2500px; }
  .node { min-width: 130px; max-width: 200px; }
  .card-grid { grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); }
}