/* ==========================================================================
   Osteopathy Knowledge Graph — Minimal Dark Theme
   ========================================================================== */

:root {
  --bg: #0a0f1a;
  --bg-surface: #111827;
  --bg-hover: #1e293b;
  --text: #e2e8f0;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --border: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(255, 255, 255, 0.15);
  --panel-w: 380px;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

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

html, body {
  height: 100%;
  overflow: hidden;
  font-family: 'Inter', -apple-system, system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
}

button { cursor: pointer; border: none; background: none; color: inherit; font: inherit; }

/* ==========================================================================
   Welcome Overlay
   ========================================================================== */

.welcome-overlay {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg);
  transition: opacity 0.5s var(--ease);
}

.welcome-overlay.dismissing { opacity: 0; pointer-events: none; }
.welcome-overlay.dismissed { display: none; }

.welcome-content { text-align: center; padding: 2rem; }

.welcome-title {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
  color: #fff;
  margin-bottom: 1.25rem;
}

.welcome-subtitle {
  font-size: clamp(0.95rem, 1.8vw, 1.15rem);
  color: var(--text-secondary);
  max-width: 420px;
  margin: 0 auto 2.5rem;
  line-height: 1.6;
  font-weight: 300;
}

.welcome-cta {
  display: inline-block;
  padding: 0.85rem 3rem;
  font-size: 1rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--bg);
  background: #fff;
  border-radius: 100px;
  transition: transform 0.2s var(--ease), box-shadow 0.2s;
}

.welcome-cta:hover {
  transform: scale(1.04);
  box-shadow: 0 0 40px rgba(255, 255, 255, 0.15);
}

/* ==========================================================================
   App Layout
   ========================================================================== */

#app {
  position: relative;
  width: 100%;
  height: 100vh;
  overflow: hidden;
}

#graph-container {
  position: absolute;
  inset: 0;
}

#graph-svg {
  width: 100%;
  height: 100%;
  display: block;
}

/* ==========================================================================
   Search Bar
   ========================================================================== */

.search-bar {
  position: fixed;
  top: 20px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 100;
  display: flex;
  align-items: center;
  gap: 8px;
  width: min(360px, calc(100% - 120px));
  padding: 0 16px;
  height: 44px;
  background: rgba(17, 24, 39, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border);
  border-radius: 12px;
  transition: border-color 0.2s;
}

.search-bar:focus-within { border-color: var(--border-hover); }

.search-icon { flex-shrink: 0; opacity: 0.4; }

#search-input {
  flex: 1;
  border: none;
  background: none;
  color: var(--text);
  font-size: 0.9rem;
  outline: none;
}

#search-input::placeholder { color: var(--text-muted); }

.search-clear {
  display: none;
  font-size: 1.2rem;
  color: var(--text-muted);
  padding: 4px;
}
.search-clear.visible { display: block; }

/* Search Results Dropdown */
.search-results {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  right: 0;
  background: rgba(17, 24, 39, 0.95);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  display: none;
  max-height: 360px;
  overflow-y: auto;
}
.search-results.visible { display: block; }

.result-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 16px;
  cursor: pointer;
  transition: background 0.15s;
}
.result-item:hover { background: var(--bg-hover); }

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

.result-info { display: flex; flex-direction: column; gap: 1px; min-width: 0; }
.result-name { font-size: 0.85rem; font-weight: 500; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.result-meta { font-size: 0.75rem; color: var(--text-muted); }

.search-empty {
  padding: 16px;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* ==========================================================================
   Filter Toggle Button
   ========================================================================== */

.filter-toggle {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 101;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(17, 24, 39, 0.85);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border);
  border-radius: 12px;
  color: var(--text-secondary);
  transition: border-color 0.2s, color 0.2s;
}

.filter-toggle:hover { border-color: var(--border-hover); color: var(--text); }

/* ==========================================================================
   Filter Panel (slide from right)
   ========================================================================== */

.filter-panel {
  position: fixed;
  top: 0;
  right: 0;
  z-index: 200;
  width: min(340px, 85vw);
  height: 100vh;
  background: rgba(10, 15, 26, 0.95);
  backdrop-filter: blur(24px);
  border-left: 1px solid var(--border);
  transform: translateX(100%);
  transition: transform 0.35s var(--ease);
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

.filter-panel.open { transform: translateX(0); }

.filter-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px 24px 16px;
  border-bottom: 1px solid var(--border);
}

.filter-panel-title {
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-secondary);
}

.filter-panel-close {
  font-size: 1.5rem;
  color: var(--text-muted);
  padding: 4px;
  line-height: 1;
}

.filter-panel-body { padding: 20px 24px 40px; }

.filter-section { margin-bottom: 28px; }

.filter-label {
  display: block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 12px;
}

/* Category pills */
.filter-categories {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.filter-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-muted);
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 100px;
  transition: all 0.2s;
  opacity: 0.5;
}

.filter-pill.active { opacity: 1; color: var(--text); border-color: var(--border-hover); }
.filter-pill:hover { border-color: var(--border-hover); }

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

/* Story buttons */
.filter-stories {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.story-btn {
  width: 100%;
  text-align: left;
  padding: 10px 14px;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 10px;
  transition: all 0.2s;
}

.story-btn:hover { border-color: var(--border-hover); color: var(--text); background: var(--bg-hover); }
.story-btn.active { background: rgba(255, 255, 255, 0.06); border-color: var(--border-hover); color: #fff; }

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

/* Timeline */
.filter-timeline {
  position: relative;
  height: 32px;
  margin-bottom: 8px;
}

.filter-timeline input[type="range"] {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 32px;
  -webkit-appearance: none;
  appearance: none;
  background: transparent;
  pointer-events: none;
  z-index: 2;
}

.filter-timeline input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: #fff;
  border: 2px solid var(--bg);
  box-shadow: 0 0 0 1px rgba(255,255,255,0.2);
  pointer-events: all;
  cursor: grab;
}

.filter-timeline input[type="range"]::-moz-range-thumb {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: #fff;
  border: 2px solid var(--bg);
  box-shadow: 0 0 0 1px rgba(255,255,255,0.2);
  pointer-events: all;
  cursor: grab;
}

.timeline-track {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  height: 3px;
  background: rgba(255, 255, 255, 0.3);
  border-radius: 2px;
  z-index: 1;
}

/* Timeline base track */
.filter-timeline::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 0;
  right: 0;
  height: 3px;
  transform: translateY(-50%);
  background: rgba(255, 255, 255, 0.08);
  border-radius: 2px;
}

.timeline-range {
  display: block;
  text-align: center;
  font-size: 0.78rem;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
}

/* ==========================================================================
   Detail Panel
   ========================================================================== */

.detail-panel {
  position: fixed;
  top: 0;
  right: 0;
  z-index: 150;
  width: var(--panel-w);
  height: 100vh;
  background: rgba(10, 15, 26, 0.95);
  backdrop-filter: blur(24px);
  border-left: 1px solid var(--border);
  transform: translateX(100%);
  transition: transform 0.35s var(--ease);
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

.detail-panel.open { transform: translateX(0); }

.panel-close {
  position: absolute;
  top: 16px;
  right: 16px;
  font-size: 1.5rem;
  color: var(--text-muted);
  z-index: 2;
  padding: 4px;
  line-height: 1;
}

.panel-content { padding: 48px 28px 40px; }

.panel-header { margin-bottom: 20px; }

.panel-title {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
  color: #fff;
}

.panel-badges {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.category-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-secondary);
  border: 1px solid var(--border);
  border-radius: 100px;
}

.category-badge::before {
  content: '';
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--cat-color, #888);
}

.year-badge {
  padding: 4px 10px;
  font-size: 0.75rem;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
}

.panel-description {
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: 24px;
}

.panel-section-title {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.conn-count {
  font-weight: 400;
  color: var(--text-muted);
  opacity: 0.6;
}

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

.conn-group-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 0 4px;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.conn-group-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  flex-shrink: 0;
}

.conn-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 0 6px 14px;
  cursor: pointer;
  border-radius: 6px;
  transition: background 0.15s;
}

.conn-item:hover { background: var(--bg-hover); }

.conn-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  flex-shrink: 0;
}

.conn-arrow {
  font-size: 0.7rem;
  color: var(--text-muted);
  opacity: 0.5;
}

.conn-name {
  font-size: 0.82rem;
  color: var(--text);
}

/* ==========================================================================
   Graph Stats
   ========================================================================== */

.graph-stats {
  position: fixed;
  bottom: 16px;
  left: 20px;
  z-index: 50;
  font-size: 0.72rem;
  color: var(--text-muted);
  opacity: 0.5;
  font-variant-numeric: tabular-nums;
}

/* ==========================================================================
   Graph Elements
   ========================================================================== */

.node {
  cursor: pointer;
  transition: r 0.15s var(--ease);
}

.node-label {
  fill: var(--text-secondary);
  font-size: 11px;
  font-family: 'Inter', sans-serif;
  pointer-events: none;
  transition: opacity 0.2s;
}

.node-label.label-hidden { opacity: 0; }

.node-group.dimmed { opacity: 0.08; }
.node-group.search-dimmed { opacity: 0.08; }
.node-group.selected .node { filter: url(#glow); }

.link { transition: stroke-opacity 0.3s; }
.link.dimmed { stroke-opacity: 0.03 !important; }
.link.search-dimmed { stroke-opacity: 0.03 !important; }
.link.highlighted { stroke-opacity: 0.7 !important; }

/* ==========================================================================
   Mobile Responsive
   ========================================================================== */

@media (max-width: 767px) {
  .search-bar {
    top: 12px;
    width: calc(100% - 76px);
    left: 12px;
    transform: none;
    height: 40px;
  }

  .filter-toggle {
    top: 12px;
    right: 12px;
    width: 40px;
    height: 40px;
  }

  .detail-panel {
    top: auto;
    bottom: 0;
    left: 0;
    right: 0;
    width: 100%;
    height: 55vh;
    border-left: none;
    border-top: 1px solid var(--border);
    border-radius: 16px 16px 0 0;
    transform: translateY(100%);
  }

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

  /* Drag handle for mobile panel */
  .detail-panel::before {
    content: '';
    position: absolute;
    top: 10px;
    left: 50%;
    transform: translateX(-50%);
    width: 36px;
    height: 4px;
    background: rgba(255, 255, 255, 0.15);
    border-radius: 2px;
  }

  .panel-content { padding: 32px 20px; }

  .graph-stats {
    bottom: 8px;
    left: 12px;
    font-size: 0.65rem;
  }
}

/* ==========================================================================
   Scrollbar
   ========================================================================== */

::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(255, 255, 255, 0.1); border-radius: 2px; }