/* ========== 第9课 · 深度学习实验室（重构：体现网络的“深度”） ========== */
#dlvlab {
  --v: #8E44AD; --v2: #C39BD3; --v-deep: #6C3483;
  --v-soft: #f6eefb; --v-line: #e6d6f3;
  --cat: #ff8b3d; --dog: #2f9de0;
  --ink: #3b2a4a; --ink2: #5a4a6e; --ink3: #9b8fb0;
  --card: #ffffff; --line: #efe7f6;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--ink2);
}
#dlvlab * { box-sizing: border-box; margin: 0; padding: 0; }
#dlvlab { margin: -2px; padding: 18px 18px 12px; border-radius: 20px;
  background:
    radial-gradient(700px 300px at 100% 0%, #f1e4fa 0%, rgba(241,228,250,0) 60%),
    radial-gradient(600px 260px at 0% 100%, #ffe9d9 0%, rgba(255,233,217,0) 55%),
    #fbf7fd; }

#dlvlab .dl-head { display: flex; align-items: center; gap: 12px; margin-bottom: 14px; flex-wrap: wrap; }
#dlvlab .dl-ic { font-size: 34px; line-height: 1; }
#dlvlab .dl-head b { color: var(--v-deep); font-size: 19px; display: block; line-height: 1.35; }
#dlvlab .dl-sub { font-size: 12.5px; color: var(--ink3); display: block; margin-top: 2px; }

#dlvlab .dl-card { background: var(--card); border: 1px solid var(--line); border-radius: 18px;
  padding: 16px 18px; box-shadow: 0 10px 28px -18px rgba(110,60,160,.35); margin-bottom: 14px; }
#dlvlab .dl-card h3 { font-size: 15.5px; color: var(--v-deep); margin-bottom: 10px; }
#dlvlab .dl-card ul { padding-left: 18px; }
#dlvlab .dl-card li, #dlvlab .dl-card p { font-size: 13.5px; line-height: 1.95; color: var(--ink2); }
#dlvlab .dl-card b { color: var(--v-deep); }

#dlvlab .dl-topbar { display: flex; align-items: center; justify-content: space-between; gap: 10px;
  flex-wrap: wrap; margin-bottom: 10px; }
#dlvlab .dl-pick { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
#dlvlab .dl-pick > span { font-size: 13px; font-weight: 800; color: var(--ink2); }
#dlvlab .dl-animal { border: 2px solid var(--v-line); background: #fff; color: var(--ink2);
  font-size: 14px; font-weight: 800; border-radius: 30px; padding: 7px 14px; cursor: pointer; font-family: inherit;
  transition: .13s; }
#dlvlab .dl-animal:hover { transform: translateY(-1px); }
#dlvlab .dl-animal.active { border-color: var(--v); background: var(--v-soft); color: var(--v-deep); }
#dlvlab .dl-animal:disabled { opacity: .5; cursor: default; }
#dlvlab .dl-tag { font-size: 13px; font-weight: 800; color: var(--v-deep); background: var(--v-soft);
  border: 1.5px dashed var(--v); border-radius: 20px; padding: 7px 14px; }
#dlvlab .dl-play { border: none; border-radius: 30px; padding: 9px 18px; font-size: 13.5px; font-weight: 800;
  cursor: pointer; color: #fff; font-family: inherit; background: linear-gradient(135deg, #9b59b6, var(--v));
  box-shadow: 0 6px 16px -8px rgba(110,60,160,.55); transition: .13s; }
#dlvlab .dl-play:hover { transform: translateY(-1px); }
#dlvlab .dl-play:active { transform: scale(.96); }
#dlvlab .dl-play:disabled { opacity: .55; cursor: default; }

#dlvlab #dlNet { width: 100%; height: auto; display: block; background: #fff; border: 1px solid var(--line);
  border-radius: 14px; }
#dlvlab .dl-legend { font-size: 11.5px; color: var(--ink3); margin: 7px 2px; }

#dlvlab .dl-progress { display: flex; align-items: center; gap: 10px; margin: 4px 0 8px; }
#dlvlab .dl-progress .p-track { flex: 1; height: 10px; background: #efe8f6; border-radius: 20px; overflow: hidden; }
#dlvlab .dl-progress .p-track i { display: block; height: 100%; width: 0%; border-radius: 20px;
  background: linear-gradient(90deg, #b06fd6, var(--v-deep)); transition: width .25s; }
#dlvlab .dl-progress b { font-size: 12.5px; color: var(--v-deep); white-space: nowrap; }

#dlvlab .dl-note { font-size: 13px; color: var(--ink2); line-height: 1.8; background: #fdf3ff;
  border: 1px dashed #e4c9f3; border-radius: 12px; padding: 8px 12px; min-height: 42px; }
#dlvlab .dl-note b { color: var(--v-deep); }

#dlvlab .dl-answer { display: flex; align-items: center; justify-content: center; gap: 12px; margin-top: 10px;
  background: linear-gradient(135deg, #fdf0ff, #fff6ec); border: 1px solid #f0d7f8; border-radius: 14px;
  padding: 10px 14px; min-height: 54px; }
#dlvlab .dl-answer .big { font-size: 40px; line-height: 1; }
#dlvlab .dl-answer .t { font-size: 15px; font-weight: 900; color: var(--v-deep); }
#dlvlab .dl-answer .s { font-size: 12.5px; color: var(--ink3); }
#dlvlab .dl-answer:empty { display: none; }

#dlvlab .dl-recap { font-size: 13px; color: var(--ink2); line-height: 2; background: #fff8ec;
  border: 1px dashed #f0cf9a; }

/* 学习按钮 + 计数 + 探测器清单 */
#dlvlab .dl-learn { border: 2px solid var(--v); background: #fff; color: var(--v-deep); border-radius: 30px;
  padding: 8px 16px; font-size: 13.5px; font-weight: 800; cursor: pointer; font-family: inherit; transition: .13s; }
#dlvlab .dl-learn:hover { background: var(--v-soft); }
#dlvlab .dl-learn:disabled { opacity: .55; cursor: default; }
#dlvlab .dl-seenrow { display: flex; align-items: center; flex-wrap: wrap; gap: 8px 12px; margin: 2px 0 6px;
  font-size: 12.5px; color: var(--ink2); }
#dlvlab .dl-seenrow b { color: var(--v-deep); font-size: 14px; }
#dlvlab .dl-chips { display: flex; flex-wrap: wrap; gap: 6px; }
#dlvlab .dl-chip { font-size: 11px; font-weight: 800; color: #b6a6c9; background: #f4eef9; border: 1px dashed #ddcdec;
  padding: 3px 10px; border-radius: 30px; opacity: .6; transition: .2s; }
#dlvlab .dl-chip.on { color: #fff; background: var(--v-deep); border-style: solid; opacity: 1;
  box-shadow: 0 4px 10px -6px rgba(110,60,160,.6); }
#dlvlab .dl-chip.on.l-cat { background: #e8801a; }
#dlvlab .dl-chip.on.l-dog { background: #248fd6; }