/* ===========================
   Second Brain — Style
   Dark neural-network aesthetic
   =========================== */

:root {
  /* Dark palette */
  --bg: #0a0a0f;
  --bg-elevated: #12121a;
  --bg-surface: #1a1a25;
  --bg-hover: #22222f;
  --border: #2a2a3a;
  --border-light: #1e1e2e;

  /* Text */
  --text: #e8e6f0;
  --text-muted: #8888a0;
  --text-dim: #555568;

  /* Node type colors */
  --color-concept: #6c9eff;
  --color-project: #ff6caa;
  --color-person: #ffc46c;
  --color-task: #6cffc4;
  --color-idea: #c46cff;
  --color-event: #ff8c6c;
  --color-resource: #6cfff0;
  --color-quote: #ff6c6c;

  /* Glow versions (lower opacity for backgrounds) */
  --glow-concept: rgba(108, 158, 255, 0.3);
  --glow-project: rgba(255, 108, 170, 0.3);
  --glow-person: rgba(255, 196, 108, 0.3);
  --glow-task: rgba(108, 255, 196, 0.3);
  --glow-idea: rgba(196, 108, 255, 0.3);
  --glow-event: rgba(255, 140, 108, 0.3);
  --glow-resource: rgba(108, 255, 240, 0.3);
  --glow-quote: rgba(255, 108, 108, 0.3);

  /* Context colors */
  --context-uni: #6c9eff;
  --context-personal: #ff6caa;
  --context-both: #c46cff;

  /* Typography */
  --font-display: 'DM Serif Display', Georgia, serif;
  --font-body: 'DM Sans', -apple-system, sans-serif;

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 40px;

  /* Radii */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-pill: 100px;
}

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

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  overflow: hidden;
  height: 100vh;
  width: 100vw;
}

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

/* ===== Top Bar ===== */
.top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-sm) var(--space-lg);
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border-light);
  height: 56px;
  flex-shrink: 0;
  z-index: 10;
}

.logo {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 400;
  color: var(--text);
  letter-spacing: 0.02em;
}

.top-bar-center {
  flex: 1;
  max-width: 400px;
  margin: 0 var(--space-lg);
}

.search-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.search-icon {
  position: absolute;
  left: 12px;
  color: var(--text-dim);
  pointer-events: none;
}

.search-input {
  width: 100%;
  padding: 8px 12px 8px 36px;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 0.875rem;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.search-input:focus {
  border-color: var(--color-concept);
  box-shadow: 0 0 0 3px rgba(108, 158, 255, 0.1);
}

.search-input::placeholder {
  color: var(--text-dim);
}

.search-kbd {
  position: absolute;
  right: 10px;
  padding: 2px 6px;
  font-size: 0.7rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-dim);
  font-family: var(--font-body);
  pointer-events: none;
}

.top-bar-right {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

/* Buttons */
.btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  font-family: var(--font-body);
  font-size: 0.8rem;
  font-weight: 500;
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  background: var(--bg-surface);
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.2s;
}

.btn:hover {
  background: var(--bg-hover);
  color: var(--text);
  border-color: var(--text-dim);
}

.btn-sync.syncing svg {
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.btn-add {
  background: var(--color-concept);
  color: var(--bg);
  border-color: var(--color-concept);
  font-weight: 600;
}

.btn-add:hover {
  background: #8bb4ff;
  color: var(--bg);
  border-color: #8bb4ff;
}

/* ===== Filter Bar ===== */
.filter-bar {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
  padding: var(--space-sm) var(--space-lg);
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border-light);
  flex-shrink: 0;
  overflow-x: auto;
}

.filter-group {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
}

.filter-label {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-dim);
  margin-right: 4px;
}

.filter-chip {
  padding: 4px 12px;
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 500;
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
}

.filter-chip:hover {
  background: var(--bg-hover);
  color: var(--text);
}

.filter-chip.active {
  background: var(--bg-surface);
  color: var(--text);
  border-color: var(--text-dim);
}

/* ===== Main Content ===== */
.main-content {
  display: flex;
  flex: 1;
  overflow: hidden;
  position: relative;
}

/* ===== Graph ===== */
.graph-container {
  flex: 1;
  position: relative;
  overflow: hidden;
}

#graphSvg {
  width: 100%;
  height: 100%;
  display: block;
}

/* Edge lines */
.edge-line {
  stroke: var(--border);
  stroke-width: 1;
  transition: stroke 0.3s, stroke-width 0.3s;
}

.edge-line.highlighted {
  stroke: var(--color-concept);
  stroke-width: 2;
}

.edge-line.dimmed {
  stroke: var(--border-light);
  opacity: 0.3;
}

/* Node circles */
.node-group {
  cursor: grab;
}

.node-group:active {
  cursor: grabbing;
}

.node-glow {
  opacity: 0.4;
  transition: opacity 0.3s;
}

.node-circle {
  stroke-width: 2;
  transition: r 0.3s, stroke-width 0.3s;
}

.node-label {
  font-family: var(--font-body);
  font-size: 11px;
  font-weight: 500;
  fill: var(--text);
  text-anchor: middle;
  pointer-events: none;
  transition: opacity 0.3s;
}

.node-group.dimmed .node-circle {
  opacity: 0.2;
}

.node-group.dimmed .node-glow {
  opacity: 0;
}

.node-group.dimmed .node-label {
  opacity: 0.15;
}

.node-group.highlighted .node-circle {
  stroke-width: 3;
}

.node-group.highlighted .node-glow {
  opacity: 0.7;
}

.node-group.selected .node-circle {
  stroke-width: 4;
  stroke: #fff;
}

.node-group.selected .node-glow {
  opacity: 0.8;
}

.node-pinned {
  font-size: 8px;
  fill: var(--text-dim);
  text-anchor: middle;
  pointer-events: none;
}

/* ===== Quick Add ===== */
.quick-add {
  position: absolute;
  bottom: var(--space-lg);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(12px);
  z-index: 5;
}

.quick-add-input {
  width: 220px;
  padding: 8px 14px;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 0.85rem;
  outline: none;
  transition: border-color 0.2s;
}

.quick-add-input:focus {
  border-color: var(--color-concept);
}

.quick-add-input::placeholder {
  color: var(--text-dim);
}

.quick-add-select {
  padding: 8px 10px;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-muted);
  font-family: var(--font-body);
  font-size: 0.8rem;
  outline: none;
  cursor: pointer;
}

.quick-add-select:focus {
  border-color: var(--color-concept);
}

/* ===== Details Panel ===== */
.details-panel {
  width: 320px;
  background: var(--bg-elevated);
  border-left: 1px solid var(--border-light);
  overflow-y: auto;
  flex-shrink: 0;
  padding: var(--space-lg);
  transition: transform 0.3s ease;
}

.details-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  color: var(--text-dim);
  text-align: center;
  gap: var(--space-md);
}

.details-empty-icon {
  opacity: 0.3;
}

.details-empty p {
  font-size: 0.85rem;
}

.details-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-md);
}

.details-type-badge {
  padding: 3px 10px;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  border-radius: var(--radius-pill);
  background: var(--bg-surface);
  border: 1px solid var(--border);
}

.details-type-badge[data-type="concept"] { color: var(--color-concept); border-color: var(--color-concept); }
.details-type-badge[data-type="project"] { color: var(--color-project); border-color: var(--color-project); }
.details-type-badge[data-type="person"] { color: var(--color-person); border-color: var(--color-person); }
.details-type-badge[data-type="task"] { color: var(--color-task); border-color: var(--color-task); }
.details-type-badge[data-type="idea"] { color: var(--color-idea); border-color: var(--color-idea); }
.details-type-badge[data-type="event"] { color: var(--color-event); border-color: var(--color-event); }
.details-type-badge[data-type="resource"] { color: var(--color-resource); border-color: var(--color-resource); }
.details-type-badge[data-type="quote"] { color: var(--color-quote); border-color: var(--color-quote); }

.details-close {
  background: none;
  border: none;
  color: var(--text-dim);
  cursor: pointer;
  padding: 4px;
  border-radius: var(--radius-sm);
  transition: color 0.2s, background 0.2s;
}

.details-close:hover {
  color: var(--text);
  background: var(--bg-hover);
}

.details-title {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 400;
  margin-bottom: var(--space-sm);
  line-height: 1.3;
}

.details-meta {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.details-context {
  padding: 2px 8px;
  border-radius: var(--radius-pill);
  background: var(--bg-surface);
  border: 1px solid var(--border);
  font-weight: 500;
  text-transform: capitalize;
}

.details-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: var(--space-lg);
}

.details-tag {
  padding: 2px 8px;
  font-size: 0.7rem;
  color: var(--text-muted);
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
}

.details-section {
  margin-bottom: var(--space-lg);
}

.details-section h3 {
  font-family: var(--font-body);
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-dim);
  margin-bottom: var(--space-sm);
}

.details-body {
  font-size: 0.85rem;
  line-height: 1.6;
  color: var(--text-muted);
}

.details-source {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.details-connections {
  list-style: none;
}

.details-connection {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 8px 10px;
  margin-bottom: 4px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background 0.2s;
  font-size: 0.85rem;
}

.details-connection:hover {
  background: var(--bg-hover);
}

.connection-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.connection-label {
  flex: 1;
  color: var(--text);
}

.connection-rel {
  font-size: 0.7rem;
  color: var(--text-dim);
}

/* ===== Stats Bar ===== */
.stats-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 6px var(--space-lg);
  background: var(--bg-elevated);
  border-top: 1px solid var(--border-light);
  font-size: 0.75rem;
  color: var(--text-dim);
  flex-shrink: 0;
}

.stats-dot {
  color: var(--border);
}

/* ===== Mobile ===== */
@media (max-width: 768px) {
  .top-bar {
    padding: var(--space-sm) var(--space-md);
  }

  .top-bar-center {
    margin: 0 var(--space-sm);
  }

  .search-kbd {
    display: none;
  }

  .filter-bar {
    padding: var(--space-sm) var(--space-md);
    gap: var(--space-md);
  }

  .filter-label {
    display: none;
  }

  /* Details panel becomes bottom sheet */
  .main-content {
    flex-direction: column;
  }

  .details-panel {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    width: 100%;
    max-height: 60vh;
    border-left: none;
    border-top: 1px solid var(--border);
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    transform: translateY(100%);
    z-index: 20;
    padding: var(--space-md);
  }

  .details-panel.open {
    transform: translateY(0);
  }

  .details-panel::before {
    content: '';
    display: block;
    width: 40px;
    height: 4px;
    background: var(--border);
    border-radius: 2px;
    margin: 0 auto var(--space-md);
  }

  .details-empty {
    display: none;
  }

  .quick-add {
    bottom: var(--space-sm);
    left: var(--space-sm);
    right: var(--space-sm);
    transform: none;
  }

  .quick-add-input {
    flex: 1;
    width: auto;
    min-width: 0;
  }

  .btn-sync span {
    display: none;
  }

  .stats-bar {
    padding: 6px var(--space-md);
  }
}

/* ===== Scrollbar ===== */
.details-panel::-webkit-scrollbar {
  width: 4px;
}

.details-panel::-webkit-scrollbar-track {
  background: transparent;
}

.details-panel::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 2px;
}

/* ===== Tooltip ===== */
.graph-tooltip {
  position: absolute;
  padding: 6px 12px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  color: var(--text);
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.15s;
  z-index: 15;
  white-space: nowrap;
}

.graph-tooltip.visible {
  opacity: 1;
}