/* ============================================================
   AI 仿真实验室 · lab.css
   深色科技风，与主站一致；独立文件避免污染主样式
   ============================================================ */
:root{
  --lab-cyan:#22d3ee; --lab-blue:#3b82f6; --lab-violet:#8b5cf6;
  --lab-ok:#34d399; --lab-warn:#fbbf24; --lab-bad:#fb7185;
  --lab-bg:#07111f; --lab-card:#0d1b2e; --lab-card2:#10233b;
  --lab-line:rgba(120,170,220,.16); --lab-ink:#e6f1ff; --lab-mute:#8aa2bd;
}
.lab-hero{
  position:relative;overflow:hidden;
  background:
    radial-gradient(900px 320px at 12% -20%,rgba(34,211,238,.20),transparent 60%),
    radial-gradient(760px 300px at 92% 0%,rgba(139,92,246,.20),transparent 60%),
    linear-gradient(180deg,#0a1830,#07111f);
  padding:56px 0 40px;color:var(--lab-ink);
}
.lab-hero-badge{display:inline-block;font-size:12px;letter-spacing:.14em;font-weight:700;color:#a5f3fc;
  border:1px solid rgba(103,232,249,.35);background:rgba(34,211,238,.08);border-radius:999px;padding:5px 14px}
.lab-hero h1{font-size:clamp(28px,4.4vw,44px);margin:14px 0 10px;font-weight:900;letter-spacing:.02em;
  background:linear-gradient(90deg,#67e8f9,#93c5fd 55%,#c4b5fd);-webkit-background-clip:text;background-clip:text;color:transparent}
.lab-hero-sub{max-width:760px;color:#b9cbe2;font-size:15px;line-height:1.8;margin:0}
.lab-hero-stats{display:flex;flex-wrap:wrap;gap:14px;margin-top:24px}
.lhs{background:rgba(255,255,255,.04);border:1px solid var(--lab-line);border-radius:14px;padding:12px 20px;min-width:120px}
.lhs b{display:block;font-size:26px;font-weight:900;color:#7dd3fc;line-height:1.1}
.lhs span{font-size:12.5px;color:var(--lab-mute)}

.lab-main{background:var(--lab-bg);color:var(--lab-ink)}
.lab-toolbar{display:flex;gap:12px;flex-wrap:wrap;align-items:center;margin-bottom:14px}
.lab-search{flex:1;min-width:240px}
.lab-search input{width:100%;padding:12px 16px;border-radius:12px;border:1px solid var(--lab-line);
  background:var(--lab-card);color:var(--lab-ink);font-size:14.5px;outline:none;transition:border-color .15s,box-shadow .15s}
.lab-search input:focus{border-color:var(--lab-cyan);box-shadow:0 0 0 3px rgba(34,211,238,.15)}
.lab-tools{display:flex;gap:8px;flex-wrap:wrap}
.lab-tools select,.lab-motion-btn{background:var(--lab-card);color:var(--lab-ink);border:1px solid var(--lab-line);
  border-radius:11px;padding:10px 13px;font-size:13px;cursor:pointer;font-family:inherit}
.lab-motion-btn.on{border-color:rgba(52,211,153,.5);color:#6ee7b7}
.lab-cats{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:18px}
.lab-cat{border:1px solid var(--lab-line);background:var(--lab-card);color:#b9cbe2;border-radius:999px;
  padding:7px 15px;font-size:13px;cursor:pointer;transition:background .15s,border-color .15s;white-space:nowrap}
.lab-cat em{font-style:normal;opacity:.65;margin-left:5px;font-size:11.5px}
.lab-cat.active{background:linear-gradient(135deg,rgba(34,211,238,.22),rgba(59,130,246,.22));
  border-color:var(--lab-cyan);color:#e6fbff;font-weight:700}
.lab-result-note{font-size:13px;color:var(--lab-mute);margin-bottom:12px}

.lab-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(268px,1fr));gap:14px}
.lab-card{position:relative;text-align:left;background:linear-gradient(160deg,var(--lab-card2),var(--lab-card));
  border:1px solid var(--lab-line);border-radius:16px;padding:16px 16px 14px;cursor:pointer;color:inherit;
  display:flex;flex-direction:column;gap:8px;overflow:hidden;transition:transform .18s ease,border-color .18s ease,box-shadow .18s ease}
.lab-card::before{content:"";position:absolute;inset:0 0 auto 0;height:3px;
  background:linear-gradient(90deg,var(--lc,#22d3ee),transparent)}
.lab-card:hover{transform:translateY(-3px);border-color:rgba(125,211,252,.55);
  box-shadow:0 12px 30px -12px rgba(34,211,238,.35)}
.lab-card.is-done{border-color:rgba(52,211,153,.45)}
.lab-card-head{display:flex;align-items:center;gap:10px}
.lab-card-ic{width:42px;height:42px;border-radius:12px;display:grid;place-items:center;font-size:22px;flex-shrink:0;
  background:rgba(255,255,255,.05);border:1px solid var(--lab-line)}
.lab-card-name{font-size:15px;font-weight:800;line-height:1.35;color:#eaf4ff}
.lab-card-no{font-size:11px;color:var(--lab-mute);font-variant-numeric:tabular-nums}
.lab-card-desc{font-size:12.5px;line-height:1.65;color:#9db4ce;flex:1}
.lab-card-foot{display:flex;align-items:center;justify-content:space-between;gap:8px;font-size:11.5px;color:var(--lab-mute)}
.lab-stars{color:var(--lab-warn);letter-spacing:1px}
.lab-done-badge{color:var(--lab-ok);font-weight:700;font-size:11.5px}
.lab-cat-tag{background:rgba(34,211,238,.1);color:#7dd3fc;border-radius:6px;padding:1px 7px}
.lab-more-wrap{text-align:center;margin:26px 0 10px}

/* ---------- 课程播放器 ---------- */
.lab-modal{position:fixed;inset:0;z-index:1000;display:none}
.lab-modal.open{display:block}
.lab-modal-mask{position:absolute;inset:0;background:rgba(3,9,18,.72);backdrop-filter:blur(3px)}
.lab-modal-box{position:absolute;inset:14px;background:var(--lab-bg);border:1px solid var(--lab-line);
  border-radius:18px;overflow:hidden;display:flex;flex-direction:column;
  box-shadow:0 30px 80px -20px rgba(0,0,0,.8)}
@media(min-width:860px){.lab-modal-box{inset:26px 40px}}
.lab-modal-x{position:absolute;top:12px;right:14px;z-index:5;width:38px;height:38px;border-radius:11px;
  background:rgba(255,255,255,.06);border:1px solid var(--lab-line);color:#cfe3f8;font-size:15px;cursor:pointer}
.lab-modal-x:hover{background:rgba(251,113,133,.18);border-color:var(--lab-bad);color:#fecdd3}
.lab-course{height:100%;overflow-y:auto;padding:22px clamp(16px,4vw,42px) 30px}
.lc-head{padding-right:46px;margin-bottom:14px}
.lc-kicker{font-size:11.5px;letter-spacing:.12em;color:#7dd3fc;font-weight:700}
.lc-title{font-size:clamp(20px,3vw,27px);font-weight:900;margin:6px 0 4px;color:#eaf4ff}
.lc-meta{display:flex;gap:8px;flex-wrap:wrap;font-size:12px;color:var(--lab-mute)}
.lc-meta span{background:rgba(255,255,255,.05);border:1px solid var(--lab-line);border-radius:7px;padding:2px 10px}

.lc-steps{display:flex;gap:6px;flex-wrap:wrap;margin:16px 0 18px;border-bottom:1px solid var(--lab-line);padding-bottom:10px}
.lc-step{border:1px solid var(--lab-line);background:transparent;color:#9db4ce;border-radius:10px;
  padding:8px 14px;font-size:13px;cursor:pointer;font-family:inherit}
.lc-step.active{background:linear-gradient(135deg,#0e7490,#1d4ed8);border-color:transparent;color:#fff;font-weight:700}
.lc-pane{display:none;animation:lcFade .22s ease}
.lc-pane.active{display:block}
@keyframes lcFade{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
.lc-pane p{line-height:1.85;color:#c4d6ec;font-size:14.5px}
.lc-pane h4{font-size:15px;color:#a5f3fc;margin:16px 0 8px}
.lc-goal{background:rgba(34,211,238,.07);border:1px solid rgba(34,211,238,.25);border-radius:13px;padding:14px 18px}
.lc-goal ul,.lc-think ul{margin:8px 0 0;padding-left:20px;line-height:2;color:#c4d6ec;font-size:14px}

.lc-challenge{background:rgba(251,191,36,.07);border:1px solid rgba(251,191,36,.3);border-radius:13px;padding:14px 18px;margin-top:14px}
.lc-challenge b{color:#fde68a}
.lc-challenge .lc-task{line-height:1.8;color:#f3e3b3;font-size:14px;margin-top:4px}
.lc-pass{display:inline-block;margin-top:10px;background:rgba(52,211,153,.15);border:1px solid #34d399;
  color:#a7f3d0;border-radius:999px;padding:5px 15px;font-size:13px;font-weight:700}
.lc-nav{display:flex;justify-content:space-between;gap:10px;margin-top:24px;border-top:1px solid var(--lab-line);padding-top:16px}
.lc-nav button{background:rgba(255,255,255,.05);border:1px solid var(--lab-line);color:#cfe3f8;border-radius:11px;
  padding:10px 18px;font-size:13.5px;cursor:pointer;font-family:inherit}
.lc-nav button:hover:not(:disabled){border-color:var(--lab-cyan);color:#a5f3fc}
.lc-nav button:disabled{opacity:.35;cursor:not-allowed}

/* ---------- 实验引擎通用外壳 ---------- */
.xp{background:var(--lab-card);border:1px solid var(--lab-line);border-radius:16px;overflow:hidden}
.xp-bar{display:flex;align-items:center;gap:10px;flex-wrap:wrap;padding:11px 15px;background:rgba(255,255,255,.03);
  border-bottom:1px solid var(--lab-line)}
.xp-bar b{font-size:13.5px;color:#dbeafe}
.xp-bar .sp{flex:1}
.xp-btn{border:1px solid rgba(125,211,252,.4);background:rgba(34,211,238,.1);color:#a5f3fc;border-radius:9px;
  padding:6px 13px;font-size:12.5px;cursor:pointer;font-family:inherit}
.xp-btn:hover{background:rgba(34,211,238,.22)}
.xp-btn.warn{border-color:rgba(251,191,36,.45);background:rgba(251,191,36,.1);color:#fde68a}
.xp-stage{position:relative;min-height:300px;display:grid;place-items:center;padding:16px}
.xp-stage canvas{max-width:100%;border-radius:12px;background:#081425;touch-action:none}
.xp-readout{font-variant-numeric:tabular-nums;background:rgba(0,0,0,.28);border:1px solid var(--lab-line);
  border-radius:9px;padding:6px 12px;font-size:12.5px;color:#bae6fd;min-width:96px;text-align:center}
.xp-controls{padding:12px 15px;border-top:1px solid var(--lab-line);display:flex;gap:16px;flex-wrap:wrap;align-items:center;
  background:rgba(255,255,255,.02)}
.xp-ctl{display:flex;align-items:center;gap:8px;font-size:12.5px;color:#9db4ce}
.xp-ctl input[type=range]{width:130px;accent-color:#22d3ee}
.xp-ctl input[type=number],.xp-ctl select{background:#081425;border:1px solid var(--lab-line);color:#dbeafe;
  border-radius:8px;padding:5px 9px;font-size:12.5px;width:84px;font-family:inherit}
.xp-hint{padding:10px 15px;font-size:12.5px;color:var(--lab-mute);border-top:1px solid var(--lab-line);background:rgba(0,0,0,.18);line-height:1.7}
.xp-legend{display:flex;gap:12px;flex-wrap:wrap;font-size:12px;color:#9db4ce;padding:0 15px 12px}
.xp-legend i{display:inline-block;width:10px;height:10px;border-radius:3px;margin-right:5px}
.xp-toast{position:absolute;left:50%;top:18px;transform:translateX(-50%) translateY(-12px);opacity:0;
  background:rgba(16,185,129,.95);color:#fff;font-size:13px;font-weight:700;border-radius:999px;padding:8px 20px;
  pointer-events:none;transition:opacity .2s,transform .2s;z-index:4}
.xp-toast.show{opacity:1;transform:translateX(-50%) translateY(0)}
.xp-flash.ok{animation:xpFlash .5s ease}
@keyframes xpFlash{0%{box-shadow:0 0 0 0 rgba(52,211,153,.6)}100%{box-shadow:0 0 0 18px rgba(52,211,153,0)}}
.xp-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px;width:100%}
@media(max-width:680px){.xp-grid{grid-template-columns:1fr}.xp-stage{min-height:240px}}
.xp-panel{background:#081425;border:1px solid var(--lab-line);border-radius:12px;padding:12px;min-height:200px}
.xp-panel h5{margin:0 0 8px;font-size:13px;color:#7dd3fc}
.xp-log{font-size:12px;line-height:1.9;color:#9fc2e6;font-family:ui-monospace,Consolas,monospace;max-height:240px;overflow:auto}
.xp-chips{display:flex;gap:6px;flex-wrap:wrap}
.xp-chip{border:1px solid var(--lab-line);background:#0b1a2c;color:#bcd2ea;border-radius:999px;padding:5px 12px;font-size:12px;cursor:pointer}
.xp-chip.on{background:rgba(34,211,238,.18);border-color:var(--lab-cyan);color:#e6fbff}
.xp-workpad{width:100%;min-height:130px;background:#081425;border:1px solid var(--lab-line);border-radius:10px;
  color:#dbeafe;padding:10px 12px;font-size:13px;font-family:inherit;resize:vertical}

/* ---------- 动效减弱（用户开关 + 系统偏好） ---------- */
html[data-motion="low"] *,html[data-motion="low"] *::before,html[data-motion="low"] *::after{
  animation-duration:.001ms!important;animation-iteration-count:1!important;
  transition-duration:.001ms!important;scroll-behavior:auto!important}
html[data-motion="low"] .lab-card:hover{transform:none}
@media (prefers-reduced-motion:reduce){
  html:not([data-motion="full"]) *,html:not([data-motion="full"]) *::before,html:not([data-motion="full"]) *::after{
    animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
}