/* ============================================================
   仿真详情页布局 — 仿真常驻左/上 + 右侧滚动讲解
   依赖 styles.css 的设计 token（--bg-* / --accent-* 等）
   ============================================================ */

.sim-detail-page {
  display: block;
}

/* ---- 顶部条 ---- */
.detail-topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 20px;
  padding: 14px 24px;
  background: rgba(13, 17, 23, 0.88);
  backdrop-filter: blur(16px) saturate(180%);
  border-bottom: 1px solid var(--border);
}

.back-link {
  font-size: 0.88rem;
  color: var(--text-secondary);
  white-space: nowrap;
}
.back-link:hover {
  color: var(--accent-cyan);
}

.detail-heading {
  display: flex;
  align-items: center;
  gap: 14px;
  flex: 1;
  min-width: 260px;
}
.detail-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}
.detail-meta {
  display: flex;
  align-items: center;
  gap: 10px;
}
.detail-badge {
  padding: 3px 10px;
  border-radius: 12px;
  font-size: 0.72rem;
  font-weight: 600;
  border: 1px solid var(--border);
}
.detail-badge[data-category="antenna"] { background: rgba(0,255,102,.15); color: var(--accent-green); border-color: rgba(0,255,102,.25); }
.detail-badge[data-category="field-kinematics"] { background: rgba(0,242,254,.15); color: var(--accent-cyan); border-color: rgba(0,242,254,.25); }
.detail-badge[data-category="mechanics"] { background: rgba(255,102,0,.15); color: var(--accent-orange); border-color: rgba(255,102,0,.25); }
.detail-badge[data-category="circuit"] { background: rgba(188,140,255,.15); color: var(--accent-purple); border-color: rgba(188,140,255,.25); }

.difficulty-chip {
  font-size: 0.72rem;
  color: var(--text-secondary);
  font-family: var(--font-mono);
  white-space: nowrap;
}

.detail-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

/* ---- 两栏布局 ---- */
.detail-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(320px, 0.75fr);
  gap: 0;
  align-items: stretch;
  min-height: calc(100vh - 64px);
}

/* 仿真舞台（常驻） */
.sim-stage {
  position: sticky;
  top: 64px;
  height: calc(100vh - 64px);
  background: var(--bg-primary);
  border-right: 1px solid var(--border);
}
.sim-stage-inner {
  position: relative;
  width: 100%;
  height: 100%;
}
.sim-frame {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: none;
  background: var(--bg-primary);
}

/* 右侧讲解（滚动） */
.sim-info {
  padding: 28px 28px 64px;
  max-width: 720px;
  overflow-y: auto;
}
.info-section {
  margin-bottom: 30px;
  scroll-margin-top: 80px;
}
.info-h {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
  padding-left: 12px;
  border-left: 3px solid var(--accent-cyan);
  margin-bottom: 12px;
}
.info-desc {
  color: var(--text-secondary);
  line-height: 1.75;
}
.prose {
  color: var(--text-secondary);
  line-height: 1.8;
}

/* 公式 */
.formula-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.formula-list li {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 14px 16px;
}
.formula {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.98rem;
  color: var(--accent-green);
  word-break: break-word;
}
.formula-label {
  display: inline-block;
  margin-top: 6px;
  font-size: 0.78rem;
  color: var(--text-secondary);
}
.formula-desc {
  margin-top: 4px;
  font-size: 0.8rem;
  color: var(--text-tertiary);
}

/* 引导实验 */
.exp-list {
  list-style: none;
  counter-reset: exp;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.exp-step {
  display: flex;
  gap: 12px;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 14px 16px;
}
.exp-num {
  flex-shrink: 0;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--bg-primary);
  background: var(--accent-cyan);
}
.exp-step strong {
  color: var(--text-primary);
  font-size: 0.92rem;
}
.exp-step p {
  margin-top: 4px;
  color: var(--text-secondary);
  font-size: 0.86rem;
  line-height: 1.6;
}
.exp-expect {
  color: var(--accent-green) !important;
  font-size: 0.8rem !important;
}
.exp-step { cursor: pointer; transition: border-color var(--transition-base), opacity var(--transition-base); }
.exp-step.done { border-color: rgba(0,255,102,.4); opacity: .72; }
.exp-step.done strong { color: var(--accent-green); }
.exp-step.done .exp-num { background: var(--accent-green); }
.exp-progress {
  margin-left: auto;
  font-size: 0.72rem;
  font-family: var(--font-mono);
  color: var(--text-tertiary);
  font-weight: 400;
  border-left: none;
}

/* 视频 / 关联 */
.video-list { list-style: none; display: flex; flex-direction: column; gap: 8px; }
.video-list a { font-size: 0.9rem; }
.video-plat {
  margin-left: 8px;
  font-size: 0.7rem;
  color: var(--text-tertiary);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1px 8px;
}
.rel-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 10px;
}
.rel-card {
  display: block;
  padding: 12px 14px;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.85rem;
  transition: all var(--transition-base);
}
.rel-card:hover {
  border-color: var(--accent-cyan);
  color: var(--text-primary);
  transform: translateY(-2px);
}

/* ---- 响应式 ---- */
@media (max-width: 900px) {
  .detail-layout {
    grid-template-columns: 1fr;
    min-height: 0;
  }
  .sim-stage {
    position: relative;
    top: 0;
    height: 60vh;
    border-right: none;
    border-bottom: 1px solid var(--border);
  }
  .sim-info { max-width: none; padding: 24px 18px 56px; }
}