/* Workspace canvas */
.ws {
  flex: 1;
  min-width: 0;
  position: relative;
  overflow: hidden;
  background-color: var(--surface-2);
  background-image: radial-gradient(circle, var(--line-strong) 1px, transparent 1.2px);
  background-size: 22px 22px;
  cursor: default;
  touch-action: none;
}
.ws.panning { cursor: grabbing; }
.ws.drop-target { box-shadow: inset 0 0 0 3px var(--excerpt); background-color: color-mix(in srgb, var(--excerpt) 6%, var(--surface-2)); }
.ws-world { position: absolute; left: 0; top: 0; width: 0; height: 0; transform-origin: 0 0; }
.ws-world.gliding { transition: transform .3s ease; }
.ws-links { position: absolute; left: 0; top: 0; width: 1px; height: 1px; overflow: visible; }
.ws-links .link { fill: none; stroke: var(--line-strong); stroke-width: 2; pointer-events: none; transition: stroke .15s; }
.ws-links .link-hit { fill: none; stroke: transparent; stroke-width: 14; pointer-events: stroke; cursor: pointer; }
.ws-links g:hover .link { stroke: var(--accent); }
.ws-links .link.hot { stroke: var(--accent); stroke-width: 2.5; }
.ws-links .rubber { fill: none; stroke: var(--accent); stroke-width: 2; stroke-dasharray: 5 4; }

.ws-empty {
  position: absolute;
  inset: 0;
  display: grid;
  place-content: center;
  gap: 4px;
  text-align: center;
  color: var(--muted);
  padding: 24px;
  pointer-events: none;
}
.ws-empty strong { color: var(--ink-2); font-size: 15px; }

/* Cards */
.card {
  position: absolute;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 10px;
  box-shadow: var(--shadow);
  cursor: grab;
  user-select: none;
  transition: box-shadow .15s, border-color .15s;
}
.card:hover { border-color: var(--line-strong); }
.card.dragging { cursor: grabbing; box-shadow: var(--shadow-lg); z-index: 5; }
/* Linked to the hovered / selected card */
.card.linked { border-color: color-mix(in srgb, var(--accent) 65%, var(--line)); box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 20%, transparent), var(--shadow); z-index: 3; }
.card.selected { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent), var(--shadow-lg); z-index: 4; }
.card.hot { border-color: var(--excerpt); }
.card.link-target { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft), var(--shadow); }
.card.excerpt { border-left: 3px solid var(--excerpt); }
.card.arrive { animation: arrive .45s cubic-bezier(.2, .9, .3, 1.3); }
.card.pulse { animation: card-pulse 1.1s ease-out; }
@keyframes arrive { from { opacity: 0; transform: scale(.92) translateY(6px); } }
@keyframes card-pulse { 0%, 35% { box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 35%, transparent), var(--shadow-lg); } }

.card-quote {
  margin: 0;
  padding: 12px 14px 8px;
  font: 15px/1.5 var(--serif);
  color: var(--ink);
  cursor: pointer;
}
.card-quote::before { content: "“"; color: var(--excerpt); font-size: 1.3em; line-height: 0; margin-right: 1px; }
.card-quote::after { content: "”"; color: var(--excerpt); }
.card.orphan .card-quote { color: var(--muted); text-decoration: line-through; text-decoration-color: var(--line-strong); }
.card-note {
  display: block;
  width: 100%;
  border: 0;
  background: transparent;
  color: var(--ink-2);
  font: 13px/1.45 var(--sans);
  padding: 0 14px 11px;
  resize: none;
  overflow: hidden;
  cursor: text;
  user-select: text;
}
.card-note:focus { outline: none; color: var(--ink); }
.card-note::placeholder { color: var(--muted); }
.card.excerpt:not(.has-note):not(.selected):not(:focus-within) .card-note { height: 0 !important; padding-bottom: 4px; opacity: 0; }
.card.note .card-note { padding: 12px 26px 12px 14px; color: var(--ink); font-size: 14px; min-height: 44px; }

.card-author {
  position: absolute;
  top: -9px;
  left: 10px;
  font: 600 10px/16px var(--sans);
  padding: 0 6px;
  border-radius: 999px;
  background: var(--agent);
  color: var(--on-agent);
}
.card-close {
  position: absolute;
  top: 3px;
  right: 3px;
  width: 22px;
  height: 22px;
  padding: 0;
  color: var(--muted);
  font-size: 16px;
  line-height: 1;
  opacity: 0;
  transition: opacity .12s;
}
.card:hover .card-close, .card.selected .card-close { opacity: 1; }
/* Marking in progress: cards can be selected and read, not moved, linked or deleted. */
.is-marking .card { cursor: pointer; }
.is-marking .card-close, .is-marking .port { display: none; }

/* Link port: drag it onto another card */
.port {
  position: absolute;
  right: -7px;
  top: 50%;
  width: 12px;
  height: 12px;
  margin-top: -6px;
  border-radius: 50%;
  background: var(--surface);
  border: 2px solid var(--line-strong);
  cursor: crosshair;
  opacity: 0;
  transition: opacity .12s, transform .12s, border-color .12s;
}
.card:hover .port, .card.selected .port { opacity: 1; }
.port:hover { border-color: var(--accent); background: var(--accent); transform: scale(1.25); }