/* ============================================================
   项目区分组 · projects-split.css
   ------------------------------------------------------------
   配合 projects-split.js：#projectGrid 被切成两组
     .pgroup-main   AI 产品与增长
     .pgroup-poker  德州扑克（左缘 2px 强调线 + 菱形标记）
   只做分组与识别，卡片本身的视觉沿用 style.css / interactions.css。
   只用现有变量，不写裸色值。
   ============================================================ */

:root {
  --pg-gap-y: clamp(3.5rem, 6vw, 5rem);   /* 两组之间的呼吸 */
  --pg-rail-gap: 1.5rem;                   /* 扑克组强调线到卡片的距离 */
}

/* ---- 0. 容器：分组后外层不再是栅格，由每组自己排 ---- */
#projectGrid.is-split {
  display: block;
  perspective: none;
}

.pgroup {
  position: relative;
}
.pgroup + .pgroup {
  margin-top: var(--pg-gap-y);
  padding-top: var(--pg-gap-y);
  border-top: 1px solid var(--border);
}

/* ---- 1. 组头：mono 小标 + 数量 ---- */
.pgroup-head {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  margin-bottom: 1.75rem;
}
.pgroup-head.reveal {
  transform: translateY(12px);
}
.pgroup-head.reveal.visible {
  transform: none;
}

.pgroup-title {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 500;
  line-height: 1;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--fg-dim);
}

.pgroup-count {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum" 1;
}
.pgroup-count::before {
  content: '';
  display: inline-block;
  width: 1px;
  height: 0.75em;
  margin-right: 0.75rem;
  vertical-align: -0.08em;
  background: var(--border-strong);
}

/* ---- 2. 组内栅格：沿用 .project-grid 的列规则，卡片宽度一致 ---- */
.pgroup-grid {
  position: relative;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: var(--space-6, 1.5rem);
  perspective: 1400px;
}

/* ---- 3. 扑克组识别：左缘强调线 + 菱形标记 + 略重一档 ---- */
.pgroup-poker .pgroup-grid::before {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: calc(-1 * var(--pg-rail-gap));
  width: 2px;
  border-radius: 1px;
  background: linear-gradient(
    to bottom,
    var(--accent) 0%,
    var(--accent) 72%,
    rgba(var(--accent-rgb), 0) 100%
  );
  pointer-events: none;
}

.pgroup-poker .pgroup-title {
  font-size: 0.79rem;            /* 比主组大约 15% */
  color: var(--fg-muted);
}

.pgroup-mark {
  display: inline-flex;
  width: 9px;
  height: 9px;
  flex: none;
  color: var(--accent);
}
.pgroup-mark svg {
  width: 100%;
  height: 100%;
  fill: currentColor;
  display: block;
}

/* hover 时边框直接落到 accent，比主组的 accent-dim 更明确 */
.pgroup-poker .project-card:not(.placeholder):hover {
  border-color: var(--accent);
}

/* 互斥变暗只在本组内发生：hover 一组，另一组维持原样
   （覆盖 interactions.css 里 .project-grid:hover .project-card） */
@media (hover: hover) and (min-width: 901px) {
  .project-grid .pgroup:not(:hover) .project-card {
    opacity: 1;
  }
}

/* ---- 4. 占位卡：虚线框、不可点、无位移 ---- */
.project-card.pg-ph {
  border: 1px dashed var(--border-strong);
  background: transparent;
  box-shadow: none;
  min-height: 200px;
  cursor: default;
  pointer-events: none;
  user-select: none;
}
.project-card.pg-ph::before,
.project-card.pg-ph::after {
  display: none;
}
.project-card.pg-ph:hover {
  transform: none;
  border-color: var(--border-strong);
  box-shadow: none;
}
/* 数据自带的占位卡（data.json placeholder:true）同样不参与 hover 位移、不可点 */
.pgroup .project-card.placeholder {
  cursor: default;
}
.pgroup .project-card.placeholder:hover {
  transform: none;
  box-shadow: none;
}
.project-card.pg-ph .project-card-inner {
  justify-content: center;
  align-items: flex-start;
  gap: 0.625rem;
}

.pg-ph-mark {
  display: block;
  width: 18px;
  height: 1px;
  background: var(--border-strong);
  margin-bottom: 0.375rem;
}
.pg-ph-title {
  font-family: var(--font-serif);
  font-size: 1.0625rem;
  font-weight: 600;
  line-height: 1.3;
  color: var(--fg-dim);
}
.pg-ph-sub {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--fg-dim);
  opacity: 0.8;
}
.pgroup-poker .pg-ph-mark {
  background: var(--accent-dim);
}

/* 组容器被 hover 时占位卡不参与变暗 */
@media (hover: hover) and (min-width: 901px) {
  .project-grid .pgroup:hover .project-card.pg-ph {
    opacity: 0.7;
  }
}

/* ---- 5. 浅色主题微调 ---- */
[data-palette="frost"] .pgroup-poker .pgroup-grid::before,
[data-palette="mist"]  .pgroup-poker .pgroup-grid::before {
  opacity: 0.85;
}
[data-palette="frost"] .project-card.pg-ph,
[data-palette="mist"]  .project-card.pg-ph {
  background: rgba(var(--fg-rgb), 0.015);
}

/* ---- 6. 响应式 ---- */
@media (max-width: 900px) {
  .pgroup-grid {
    grid-template-columns: minmax(0, 1fr);
  }
  /* 单列时 featured 不能再跨两列，否则撑出隐式列 */
  .pgroup-grid .project-card.featured {
    grid-column: span 1;
  }
}

@media (max-width: 640px) {
  :root {
    --pg-gap-y: 2.75rem;
    --pg-rail-gap: 0.75rem;
  }
  .pgroup-head {
    margin-bottom: 1.25rem;
  }
  .pgroup-poker .pgroup-grid::before {
    width: 2px;
  }
  .project-card.pg-ph {
    min-height: 150px;
  }
}

/* ---- 7. 无障碍降级 ---- */
@media (prefers-reduced-motion: reduce) {
  .pgroup-head.reveal,
  .pgroup-head.reveal.visible {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .pgroup-poker .project-card:not(.placeholder):hover {
    transform: none;
  }
}