/* spine.css — Three-spine pro deck (focus filters) */

/* ── Three-spine pro deck ── */
.spine-deck {
  padding: 28px 38px 8px;
  border-bottom: 1px solid var(--rule);
  background:
    radial-gradient(ellipse 80% 80% at 10% 0%, var(--spine-g-soft), transparent 55%),
    radial-gradient(ellipse 80% 80% at 50% 0%, var(--spine-n-soft), transparent 55%),
    radial-gradient(ellipse 80% 80% at 90% 0%, var(--spine-a-soft), transparent 55%),
    linear-gradient(180deg, var(--summary-bg-top), var(--paper));
}
.spine-deck-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px 18px;
  margin-bottom: 16px;
}
.spine-deck-kicker {
  font-family: var(--mono);
  font-size: 0.62rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--soft);
}
.spine-deck-title {
  font: 600 1.35rem/1.25 var(--serif);
  letter-spacing: -0.02em;
  color: var(--ink);
}
.spine-deck-hint {
  font-family: var(--mono);
  font-size: 0.62rem;
  color: var(--soft);
  letter-spacing: 0.04em;
}
.spine-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}
.spine-card {
  appearance: none;
  text-align: left;
  cursor: pointer;
  border: 1px solid var(--rule);
  border-radius: 12px;
  background: var(--card-bg);
  padding: 0;
  overflow: hidden;
  position: relative;
  color: inherit;
  font: inherit;
  box-shadow: var(--shadow-sm);
  transition:
    border-color 0.25s var(--ease),
    transform 0.25s var(--ease),
    box-shadow 0.25s var(--ease),
    opacity 0.25s var(--ease);
}
.spine-card::before {
  content: "";
  display: block;
  height: 3px;
  background: var(--spine-color, var(--accent));
}
.spine-card[data-spine="graphics"] { --spine-color: var(--spine-g); }
.spine-card[data-spine="neural"] { --spine-color: var(--spine-n); }
.spine-card[data-spine="agents"] { --spine-color: var(--spine-a); }
.spine-card-inner { padding: 16px 16px 18px; }
.spine-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-card);
  border-color: color-mix(in srgb, var(--spine-color) 45%, var(--rule));
}
.spine-card.is-active {
  border-color: var(--spine-color);
  box-shadow: var(--shadow-card), 0 0 0 1px color-mix(in srgb, var(--spine-color) 35%, transparent);
  background: linear-gradient(180deg, color-mix(in srgb, var(--spine-color) 10%, var(--card-bg)), var(--card-bg-end));
}
.spine-card.is-dim {
  opacity: 0.42;
  transform: none;
  box-shadow: none;
}
.spine-card-tag {
  font-family: var(--mono);
  font-size: 0.58rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--spine-color);
  font-weight: 600;
  margin-bottom: 8px;
}
.spine-card h2 {
  font: 600 1.12rem/1.2 var(--serif);
  letter-spacing: -0.015em;
  margin-bottom: 8px;
  color: var(--ink);
}
.spine-card p {
  font-size: 0.84rem;
  line-height: 1.55;
  color: var(--muted);
  margin-bottom: 12px;
  min-height: 3.8em;
}
.spine-proof {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.spine-proof span {
  font-family: var(--mono);
  font-size: 0.6rem;
  letter-spacing: 0.04em;
  padding: 4px 8px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--spine-color) 12%, transparent);
  color: var(--ink);
  border: 1px solid color-mix(in srgb, var(--spine-color) 28%, var(--rule));
}
.spine-all-btn {
  margin-top: 14px;
  margin-bottom: 8px;
  appearance: none;
  border: 1px dashed var(--rule-strong);
  background: transparent;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.62rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 8px 14px;
  border-radius: 999px;
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s, background 0.2s;
}
.spine-all-btn:hover,
.spine-all-btn.is-active {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-soft);
}

/* spine focus dims non-matching work */
body[data-spine-focus="graphics"] .spine-target:not([data-spines~="graphics"]),
body[data-spine-focus="neural"] .spine-target:not([data-spines~="neural"]),
body[data-spine-focus="agents"] .spine-target:not([data-spines~="agents"]) {
  opacity: 0.28;
  filter: grayscale(0.35);
  transition: opacity 0.3s var(--ease), filter 0.3s var(--ease);
}
body[data-spine-focus="graphics"] .spine-target[data-spines~="graphics"],
body[data-spine-focus="neural"] .spine-target[data-spines~="neural"],
body[data-spine-focus="agents"] .spine-target[data-spines~="agents"] {
  opacity: 1;
  filter: none;
}
.spine-target {
  transition: opacity 0.3s var(--ease), filter 0.3s var(--ease);
}
.featured.spine-target {
  border-left: 3px solid transparent;
  padding-left: 8px;
  margin-left: -8px;
}
body[data-spine-focus="graphics"] .featured.spine-target[data-spines~="graphics"] { border-left-color: var(--spine-g); }
body[data-spine-focus="neural"] .featured.spine-target[data-spines~="neural"] { border-left-color: var(--spine-n); }
body[data-spine-focus="agents"] .featured.spine-target[data-spines~="agents"] { border-left-color: var(--spine-a); }

.page {
  border-radius: 4px;
}
.page::before {
  height: 3px;
  background: linear-gradient(90deg,
    var(--spine-g) 0%,
    var(--spine-g) 33%,
    var(--spine-n) 33%,
    var(--spine-n) 66%,
    var(--spine-a) 66%,
    var(--spine-a) 100%);
}