/* ============================================================
   物理实验室 · PHYSICS LAB
   独立样式表 · 全部选择器以 .pl- 前缀命名，避免污染原主题
   设计：深海蓝底 + 冷白文字 + 青蓝强调
   ============================================================ */
.pl-app{
  --pl-bg:#060a13; --pl-bg2:#0a1120; --pl-panel:#0c1424; --pl-panel2:#101a2e;
  --pl-line:rgba(255,255,255,.075); --pl-line2:rgba(255,255,255,.14);
  --pl-fg:#e9effb; --pl-fg2:#c3cee2; --pl-dim:#7d8ba5; --pl-dim2:#56627a;
  --pl-cyan:#38d9d0; --pl-blue:#5b8cff; --pl-amber:#f5c451;
  --pl-red:#ff6b6b; --pl-green:#4ade80; --pl-violet:#a78bfa;
  --pl-sans:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --pl-mono:"SF Mono",ui-monospace,Menlo,Consolas,"Roboto Mono",monospace;
  --pl-serif:"Songti SC","Noto Serif SC",Georgia,serif;
  --pl-r:14px; --pl-r2:18px;
  position:relative; min-height:100vh; min-height:100dvh;
  color:var(--pl-fg); font-family:var(--pl-sans);
  background:
    radial-gradient(900px 480px at 12% -8%, rgba(91,140,255,.16), transparent 62%),
    radial-gradient(760px 420px at 92% 4%, rgba(56,217,208,.10), transparent 60%),
    linear-gradient(180deg,#060a13 0%,#070c17 46%,#05080f 100%);
  background-attachment:fixed;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
.pl-app *,.pl-app *::before,.pl-app *::after{box-sizing:border-box}
.pl-app a{color:inherit;text-decoration:none}
.pl-app button{font-family:inherit}
.pl-app ::-webkit-scrollbar{width:6px;height:6px}
.pl-app ::-webkit-scrollbar-thumb{background:rgba(255,255,255,.16);border-radius:3px}

/* 细网格背景，低对比，避免“满屏发光” */
.pl-app::before{
  content:"";position:fixed;inset:0;pointer-events:none;z-index:0;opacity:.5;
  background-image:
    linear-gradient(rgba(255,255,255,.022) 1px,transparent 1px),
    linear-gradient(90deg,rgba(255,255,255,.022) 1px,transparent 1px);
  background-size:44px 44px;
  mask-image:radial-gradient(ellipse 80% 60% at 50% 0%,#000 30%,transparent 100%);
  -webkit-mask-image:radial-gradient(ellipse 80% 60% at 50% 0%,#000 30%,transparent 100%);
}

/* ---------------- 顶部 ---------------- */
.pl-top{
  position:sticky;top:0;z-index:40;
  display:flex;align-items:center;gap:10px;
  padding:10px 14px;padding-top:calc(10px + env(safe-area-inset-top));
  background:rgba(6,10,19,.78);
  border-bottom:1px solid var(--pl-line);
  backdrop-filter:blur(18px) saturate(140%);
  -webkit-backdrop-filter:blur(18px) saturate(140%);
}
.pl-brand{display:flex;align-items:center;gap:9px;min-width:0}
.pl-logo{
  width:34px;height:34px;flex:0 0 auto;border-radius:10px;display:grid;place-items:center;
  background:linear-gradient(145deg,rgba(91,140,255,.28),rgba(56,217,208,.16));
  border:1px solid rgba(91,140,255,.38);
  box-shadow:0 0 0 1px rgba(255,255,255,.03) inset,0 6px 18px rgba(0,0,0,.35);
}
.pl-logo svg{width:19px;height:19px;stroke:var(--pl-cyan);fill:none;stroke-width:1.5}
.pl-brand b{display:block;font-size:14.5px;letter-spacing:.06em;font-weight:600;line-height:1.2}
.pl-brand span{display:block;font:600 7.5px/1 var(--pl-mono);letter-spacing:.22em;color:var(--pl-dim2);margin-top:3px}
.pl-top-right{margin-left:auto;display:flex;align-items:center;gap:8px}
.pl-back{
  display:inline-flex;align-items:center;gap:4px;padding:6px 9px;border-radius:8px;
  border:1px solid var(--pl-line2);color:var(--pl-dim);font-size:10.5px;white-space:nowrap;
}
.pl-back:hover{color:var(--pl-fg);border-color:rgba(91,140,255,.45)}
.pl-ring-mini{
  width:30px;height:30px;border-radius:50%;display:grid;place-items:center;position:relative;
  background:conic-gradient(var(--pl-cyan) calc(var(--p,0) * 1%),rgba(255,255,255,.09) 0);
}
.pl-ring-mini::after{content:"";position:absolute;inset:3px;border-radius:50%;background:#080d18}
.pl-ring-mini i{position:relative;z-index:1;font:600 7.5px/1 var(--pl-mono);font-style:normal;color:var(--pl-fg2)}

/* ---------------- 主体 ---------------- */
.pl-main{position:relative;z-index:1;max-width:1080px;margin:0 auto;
  padding:16px 14px 92px;padding-bottom:calc(92px + env(safe-area-inset-bottom))}
.pl-view{animation:plIn .34s cubic-bezier(.2,.8,.2,1)}
@keyframes plIn{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}

/* 标题区 */
.pl-h{margin:2px 0 14px}
.pl-h .eyebrow{font:600 8px/1 var(--pl-mono);letter-spacing:.24em;color:var(--pl-cyan);opacity:.85}
.pl-h h1{font-size:23px;line-height:1.3;letter-spacing:.02em;margin-top:8px;font-weight:600}
.pl-h p{margin-top:6px;font-size:12px;line-height:1.75;color:var(--pl-dim)}
.pl-h-row{display:flex;align-items:flex-end;gap:12px}
.pl-h-row .pl-h{flex:1;min-width:0}

/* 卡片 */
.pl-card{
  background:linear-gradient(160deg,rgba(255,255,255,.045),rgba(255,255,255,.015));
  border:1px solid var(--pl-line); border-radius:var(--pl-r2);
  padding:16px; position:relative; overflow:hidden;
}
.pl-card + .pl-card{margin-top:12px}
.pl-card-h{display:flex;align-items:center;gap:8px;margin-bottom:12px}
.pl-card-h b{font-size:13px;font-weight:600;letter-spacing:.03em}
.pl-card-h span{margin-left:auto;font:600 8px/1 var(--pl-mono);letter-spacing:.16em;color:var(--pl-dim2)}
.pl-card.tagline::after{
  content:"";position:absolute;right:-30px;top:-30px;width:120px;height:120px;border-radius:50%;
  background:radial-gradient(circle,rgba(56,217,208,.13),transparent 70%);
}

/* 首页 hero */
.pl-hero{
  position:relative;border-radius:20px;padding:20px 18px 18px;overflow:hidden;
  background:
    radial-gradient(120% 120% at 0% 0%,rgba(91,140,255,.22),transparent 55%),
    radial-gradient(100% 110% at 100% 100%,rgba(56,217,208,.14),transparent 60%),
    linear-gradient(150deg,#101a2e,#0a1120);
  border:1px solid rgba(91,140,255,.24);
}
.pl-hero::before{
  content:"";position:absolute;inset:0;opacity:.5;pointer-events:none;
  background:repeating-linear-gradient(115deg,transparent 0 18px,rgba(255,255,255,.02) 18px 19px);
}
.pl-hero .hi{position:relative;font:600 8.5px/1 var(--pl-mono);letter-spacing:.2em;color:var(--pl-cyan)}
.pl-hero h2{position:relative;margin-top:10px;font-size:22px;line-height:1.35;font-weight:600;letter-spacing:.01em}
.pl-hero h2 em{font-style:normal;color:var(--pl-cyan)}
.pl-hero p{position:relative;margin-top:8px;font-size:12px;line-height:1.8;color:var(--pl-fg2);max-width:520px}
.pl-hero-actions{position:relative;display:flex;flex-wrap:wrap;gap:8px;margin-top:16px}
.pl-stat-row{position:relative;display:flex;gap:18px;margin-top:18px;padding-top:14px;border-top:1px solid var(--pl-line)}
.pl-stat{min-width:0}
.pl-stat b{display:block;font:600 20px/1 var(--pl-mono);color:var(--pl-fg);font-variant-numeric:tabular-nums}
.pl-stat b small{font-size:9px;color:var(--pl-dim2);margin-left:2px}
.pl-stat span{display:block;margin-top:5px;font-size:9px;letter-spacing:.1em;color:var(--pl-dim2)}

/* 按钮 */
.pl-btn{
  display:inline-flex;align-items:center;justify-content:center;gap:6px;
  min-height:40px;padding:0 15px;border-radius:10px;cursor:pointer;
  border:1px solid var(--pl-line2);background:rgba(255,255,255,.04);
  color:var(--pl-fg2);font-size:12.5px;font-weight:500;letter-spacing:.02em;
  transition:.16s ease; -webkit-tap-highlight-color:transparent;
}
.pl-btn:hover{border-color:rgba(91,140,255,.45);color:#fff}
.pl-btn:active{transform:scale(.985)}
.pl-btn.primary{
  border-color:rgba(56,217,208,.5);color:#04121a;font-weight:600;
  background:linear-gradient(135deg,#5fe6de,#38d9d0 55%,#2bb9d6);
  box-shadow:0 8px 22px rgba(56,217,208,.18);
}
.pl-btn.primary:hover{filter:brightness(1.04)}
.pl-btn.ghost{background:none;border-color:var(--pl-line2);color:var(--pl-dim)}
.pl-btn.sm{min-height:32px;padding:0 10px;font-size:11px;border-radius:8px}
.pl-btn.block{width:100%}
.pl-btn:disabled{opacity:.4;cursor:not-allowed}
.pl-btn.danger{border-color:rgba(255,107,107,.4);color:#ffb3b3}

/* 标签 / 进度 */
.pl-chip{
  display:inline-flex;align-items:center;gap:5px;padding:5px 9px;border-radius:999px;
  border:1px solid var(--pl-line);background:rgba(255,255,255,.03);
  color:var(--pl-dim);font-size:10px;white-space:nowrap;cursor:pointer;
}
.pl-chip.on{color:#061018;background:var(--pl-cyan);border-color:var(--pl-cyan);font-weight:600}
.pl-chip.amber.on{background:var(--pl-amber);border-color:var(--pl-amber)}
.pl-chips{display:flex;gap:6px;overflow-x:auto;padding-bottom:2px;scrollbar-width:none}
.pl-chips::-webkit-scrollbar{display:none}
.pl-progress{height:5px;border-radius:4px;background:rgba(255,255,255,.07);overflow:hidden}
.pl-progress > i{display:block;height:100%;width:0;border-radius:4px;
  background:linear-gradient(90deg,var(--pl-blue),var(--pl-cyan));transition:width .5s ease}
.pl-progress.amber > i{background:linear-gradient(90deg,var(--pl-amber),#ff9f43)}

/* 首页三步 */
.pl-quick{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-top:14px}
.pl-quick a{
  display:flex;flex-direction:column;align-items:flex-start;gap:7px;padding:12px 11px;
  border-radius:12px;border:1px solid var(--pl-line);background:rgba(255,255,255,.028);
  transition:.16s;
}
.pl-quick a:hover{border-color:rgba(56,217,208,.4);background:rgba(56,217,208,.05)}
.pl-quick i{width:26px;height:26px;border-radius:7px;display:grid;place-items:center;
  background:rgba(91,140,255,.13);font-style:normal;font-size:13px}
.pl-quick b{font-size:11.5px;font-weight:600}
.pl-quick span{font-size:9px;color:var(--pl-dim2);line-height:1.4}

/* 知识地图 */
.pl-mods{display:grid;gap:10px}
.pl-mod{
  display:block;padding:15px 14px;border-radius:var(--pl-r);
  border:1px solid var(--pl-line);background:linear-gradient(150deg,rgba(255,255,255,.04),rgba(255,255,255,.012));
  transition:.18s;position:relative;overflow:hidden;
}
.pl-mod:hover{border-color:rgba(91,140,255,.4);transform:translateY(-1px)}
.pl-mod-top{display:flex;align-items:center;gap:10px}
.pl-mod-no{font:600 9px/1 var(--pl-mono);letter-spacing:.14em;color:var(--pl-cyan);
  border:1px solid rgba(56,217,208,.3);border-radius:6px;padding:5px 6px;background:rgba(56,217,208,.06)}
.pl-mod-top b{font-size:14px;font-weight:600}
.pl-mod-top em{margin-left:auto;font:600 9px/1 var(--pl-mono);color:var(--pl-dim2);font-style:normal}
.pl-mod p{margin-top:8px;font-size:11px;line-height:1.7;color:var(--pl-dim)}
.pl-mod-bar{display:flex;align-items:center;gap:8px;margin-top:12px}
.pl-mod-bar .pl-progress{flex:1}
.pl-mod-bar span{font:600 8.5px/1 var(--pl-mono);color:var(--pl-dim2)}

/* 知识点列表 */
.pl-kps{display:grid;gap:8px}
.pl-kp{
  display:flex;align-items:center;gap:11px;padding:12px 12px;border-radius:11px;
  border:1px solid var(--pl-line);background:rgba(255,255,255,.025);transition:.15s;
}
.pl-kp:hover{border-color:rgba(56,217,208,.38);background:rgba(56,217,208,.045)}
.pl-kp .idx{width:26px;height:26px;flex:0 0 auto;border-radius:8px;display:grid;place-items:center;
  font:600 9px/1 var(--pl-mono);color:var(--pl-dim);background:rgba(255,255,255,.05)}
.pl-kp.done .idx{background:rgba(74,222,128,.14);color:var(--pl-green)}
.pl-kp .tx{min-width:0;flex:1}
.pl-kp .tx b{display:block;font-size:12.5px;font-weight:500;line-height:1.4}
.pl-kp .tx span{display:block;margin-top:3px;font-size:9px;color:var(--pl-dim2)}
.pl-kp .go{font-size:14px;color:var(--pl-dim2)}

/* 知识点详情 */
.pl-crumb{display:flex;align-items:center;gap:6px;font-size:10px;color:var(--pl-dim2);margin-bottom:10px;flex-wrap:wrap}
.pl-crumb a{color:var(--pl-dim)}
.pl-crumb i{font-style:normal;opacity:.5}
.pl-lead{font-size:13px;line-height:1.9;color:var(--pl-fg2)}
.pl-sec{margin-top:16px}
.pl-sec-h{display:flex;align-items:center;gap:7px;margin-bottom:9px}
.pl-sec-h i{width:3px;height:13px;border-radius:2px;background:linear-gradient(180deg,var(--pl-cyan),var(--pl-blue))}
.pl-sec-h b{font-size:12.5px;font-weight:600;letter-spacing:.03em}
.pl-sec-h span{margin-left:auto;font:600 7.5px/1 var(--pl-mono);letter-spacing:.16em;color:var(--pl-dim2)}
.pl-block{padding:13px;border-radius:11px;border:1px solid var(--pl-line);background:rgba(255,255,255,.022)}
.pl-block + .pl-block{margin-top:8px}
.pl-block b{display:block;font-size:11.5px;color:var(--pl-fg);margin-bottom:5px}
.pl-block p{font-size:11.5px;line-height:1.85;color:var(--pl-dim)}
.pl-fx{
  display:block;margin:9px 0 3px;padding:11px 12px;border-radius:9px;
  background:rgba(91,140,255,.07);border:1px solid rgba(91,140,255,.18);
  color:#dbe8ff;font:500 13px/1.7 var(--pl-serif);letter-spacing:.02em;overflow-x:auto;
}
.pl-fx small{display:block;margin-top:5px;font:400 9.5px/1.6 var(--pl-sans);color:var(--pl-dim)}
.pl-warn{border-color:rgba(255,107,107,.26);background:rgba(255,107,107,.05)}
.pl-warn b{color:#ffb3b3}
.pl-good{border-color:rgba(74,222,128,.24);background:rgba(74,222,128,.045)}
.pl-good b{color:#9ef0bb}
.pl-list{margin:8px 0 0;padding-left:16px}
.pl-list li{font-size:11.5px;line-height:1.9;color:var(--pl-dim);margin:2px 0}

/* 例题逐步 */
.pl-example{border-color:rgba(245,196,81,.22);background:rgba(245,196,81,.035)}
.pl-example .qtext{font-size:12px;line-height:1.9;color:var(--pl-fg2)}
.pl-steps{margin-top:11px;display:grid;gap:7px}
.pl-step{border:1px solid var(--pl-line);border-radius:10px;background:rgba(0,0,0,.16);overflow:hidden}
.pl-step-h{display:flex;align-items:center;gap:8px;padding:10px 11px;cursor:pointer;user-select:none}
.pl-step-h i{width:20px;height:20px;flex:0 0 auto;border-radius:6px;display:grid;place-items:center;
  font:600 8px/1 var(--pl-mono);font-style:normal;background:rgba(245,196,81,.12);color:var(--pl-amber)}
.pl-step-h b{font-size:11px;font-weight:500;color:var(--pl-fg2)}
.pl-step-h u{margin-left:auto;font-size:11px;color:var(--pl-dim2);text-decoration:none;transition:.2s}
.pl-step.open .pl-step-h u{transform:rotate(180deg)}
.pl-step-b{display:none;padding:0 12px 12px 39px;font-size:11.5px;line-height:1.9;color:var(--pl-dim)}
.pl-step.open .pl-step-b{display:block}
.pl-step-b .pl-fx{margin-top:6px}

/* 练习 */
.pl-q{border:1px solid var(--pl-line);border-radius:var(--pl-r);padding:15px;background:rgba(255,255,255,.022)}
.pl-q + .pl-q{margin-top:10px}
.pl-q-h{display:flex;align-items:center;gap:7px;flex-wrap:wrap;margin-bottom:10px}
.pl-qid{font:600 9px/1 var(--pl-mono);color:var(--pl-cyan);border:1px solid rgba(56,217,208,.28);
  border-radius:4px;padding:4px 5px;background:rgba(56,217,208,.05)}
.pl-qtag{font:500 8.5px/1 var(--pl-sans);color:var(--pl-dim2);padding:4px 7px;border-radius:4px;
  border:1px solid var(--pl-line);background:rgba(255,255,255,.03)}
.pl-lv{margin-left:auto;font:600 8px/1 var(--pl-mono);color:var(--pl-amber);letter-spacing:.1em}
.pl-qtext{font-size:13px;line-height:1.95;color:var(--pl-fg)}
.pl-opts{display:grid;gap:7px;margin-top:12px}
.pl-opt{
  display:flex;align-items:flex-start;gap:9px;width:100%;text-align:left;padding:11px 12px;
  border-radius:9px;border:1px solid var(--pl-line);background:rgba(255,255,255,.022);
  color:var(--pl-fg2);font-size:12px;line-height:1.75;cursor:pointer;transition:.14s;
}
.pl-opt:hover{border-color:rgba(91,140,255,.4)}
.pl-opt .k{width:19px;height:19px;flex:0 0 auto;border-radius:5px;display:grid;place-items:center;
  font:600 9px/1 var(--pl-mono);background:rgba(255,255,255,.06);color:var(--pl-dim)}
.pl-opt.sel{border-color:rgba(91,140,255,.55);background:rgba(91,140,255,.1)}
.pl-opt.ok{border-color:rgba(74,222,128,.5);background:rgba(74,222,128,.1)}
.pl-opt.ok .k{background:rgba(74,222,128,.2);color:var(--pl-green)}
.pl-opt.bad{border-color:rgba(255,107,107,.5);background:rgba(255,107,107,.09)}
.pl-opt.bad .k{background:rgba(255,107,107,.18);color:var(--pl-red)}
.pl-opt:disabled{cursor:default}
.pl-fill{display:flex;gap:8px;margin-top:12px}
.pl-input{
  flex:1;min-width:0;height:42px;padding:0 12px;border-radius:9px;
  border:1px solid var(--pl-line2);background:rgba(0,0,0,.28);color:var(--pl-fg);
  font:500 13px/1 var(--pl-mono);outline:none;-webkit-appearance:none;
}
.pl-input:focus{border-color:rgba(56,217,208,.6);box-shadow:0 0 0 3px rgba(56,217,208,.1)}
.pl-input::placeholder{color:var(--pl-dim2);font-family:var(--pl-sans);font-size:11px}
.pl-feedback{margin-top:12px;padding:11px 12px;border-radius:9px;font-size:11.5px;line-height:1.9;display:none}
.pl-feedback.show{display:block}
.pl-feedback.ok{background:rgba(74,222,128,.07);border:1px solid rgba(74,222,128,.3);color:#b7f5cd}
.pl-feedback.bad{background:rgba(255,107,107,.06);border:1px solid rgba(255,107,107,.28);color:#ffc4c4}
.pl-feedback b{display:block;margin-bottom:3px;font-size:12px}
.pl-feedback .fx{margin-top:7px;color:#dfe7f8;font-family:var(--pl-serif);font-size:12px}
.pl-qact{display:flex;gap:8px;margin-top:11px;flex-wrap:wrap}

/* 结果条 */
.pl-result{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin:12px 0}
.pl-result div{padding:12px 10px;border-radius:11px;border:1px solid var(--pl-line);
  background:rgba(255,255,255,.025);text-align:center}
.pl-result b{display:block;font:600 22px/1 var(--pl-mono);font-variant-numeric:tabular-nums}
.pl-result span{display:block;margin-top:5px;font-size:9px;color:var(--pl-dim2);letter-spacing:.08em}
.pl-result .g b{color:var(--pl-green)} .pl-result .r b{color:var(--pl-red)} .pl-result .a b{color:var(--pl-amber)}

/* 空态 */
.pl-empty{padding:36px 18px;text-align:center;border:1px dashed var(--pl-line2);border-radius:var(--pl-r)}
.pl-empty b{display:block;font-size:14px;margin-bottom:7px}
.pl-empty p{font-size:11.5px;line-height:1.8;color:var(--pl-dim);max-width:340px;margin:0 auto}

/* 模拟器 */
.pl-sim{padding:0;overflow:hidden}
.pl-sim-stage{position:relative;background:radial-gradient(120% 130% at 50% 0%,#0f1b30,#070c17 70%);
  border-bottom:1px solid var(--pl-line)}
.pl-sim-stage canvas{display:block;width:100%;height:190px;touch-action:pan-y}
.pl-sim-hud{position:absolute;left:10px;top:9px;display:flex;gap:6px;flex-wrap:wrap}
.pl-hud{padding:4px 7px;border-radius:5px;background:rgba(0,0,0,.42);
  border:1px solid rgba(255,255,255,.09);font:600 8.5px/1 var(--pl-mono);color:var(--pl-fg2)}
.pl-hud b{color:var(--pl-cyan);font-weight:600}
.pl-sim-body{padding:14px}
.pl-ctl{margin-top:11px}
.pl-ctl-head{display:flex;align-items:baseline;gap:7px;margin-bottom:7px}
.pl-ctl-head b{font-size:11px;font-weight:500;color:var(--pl-fg2)}
.pl-ctl-head span{margin-left:auto;font:600 11px/1 var(--pl-mono);color:var(--pl-cyan);font-variant-numeric:tabular-nums}
.pl-ctl-head em{font:400 8px/1 var(--pl-sans);color:var(--pl-dim2);font-style:normal}
.pl-range{width:100%;height:26px;-webkit-appearance:none;background:none;outline:none}
.pl-range::-webkit-slider-runnable-track{height:4px;border-radius:3px;
  background:linear-gradient(90deg,rgba(56,217,208,.55),rgba(91,140,255,.35))}
.pl-range::-webkit-slider-thumb{-webkit-appearance:none;width:18px;height:18px;margin-top:-7px;
  border-radius:50%;background:#eaf6ff;border:3px solid #38d9d0;box-shadow:0 2px 10px rgba(56,217,208,.4)}
.pl-range::-moz-range-track{height:4px;border-radius:3px;background:rgba(56,217,208,.45)}
.pl-range::-moz-range-thumb{width:15px;height:15px;border-radius:50%;background:#eaf6ff;border:3px solid #38d9d0}
.pl-btns{display:flex;gap:7px;margin-top:14px;flex-wrap:wrap}
.pl-btns .pl-btn{flex:1;min-width:76px}
.pl-note{margin-top:11px;padding:9px 10px;border-radius:8px;background:rgba(255,255,255,.025);
  border:1px solid var(--pl-line);font-size:10px;line-height:1.75;color:var(--pl-dim)}
.pl-note b{color:var(--pl-fg2);font-weight:500}

/* 底部导航 */
.pl-tab{
  position:fixed;left:0;right:0;bottom:0;z-index:50;
  display:grid;grid-template-columns:repeat(5,1fr);
  background:rgba(7,11,20,.9);border-top:1px solid var(--pl-line);
  backdrop-filter:blur(20px) saturate(150%);
  -webkit-backdrop-filter:blur(20px) saturate(150%);
  padding-bottom:env(safe-area-inset-bottom);
}
.pl-tab a{
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;
  padding:8px 2px 7px;color:var(--pl-dim2);font-size:9px;letter-spacing:.04em;position:relative;
}
.pl-tab a svg{width:19px;height:19px;stroke:currentColor;fill:none;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}
.pl-tab a.on{color:var(--pl-cyan)}
.pl-tab a.on::before{content:"";position:absolute;top:0;width:18px;height:2px;border-radius:2px;
  background:linear-gradient(90deg,var(--pl-cyan),var(--pl-blue))}
.pl-tab a .badge{position:absolute;top:5px;right:calc(50% - 17px);min-width:13px;height:13px;
  padding:0 3px;border-radius:7px;background:var(--pl-red);color:#fff;
  font:600 7.5px/13px var(--pl-mono);text-align:center}

/* 桌面 */
@media(min-width:900px){
  .pl-main{padding:24px 24px 60px;max-width:1120px}
  .pl-h h1{font-size:28px}
  .pl-hero{padding:28px 26px}
  .pl-hero h2{font-size:28px}
  .pl-quick{grid-template-columns:repeat(3,1fr);gap:12px}
  .pl-mods{grid-template-columns:1fr 1fr}
  .pl-kps{grid-template-columns:1fr 1fr}
  .pl-tab{left:50%;transform:translateX(-50%);max-width:520px;bottom:16px;border-radius:16px;
    border:1px solid var(--pl-line2);box-shadow:0 16px 50px rgba(0,0,0,.5)}
  .pl-main{padding-bottom:110px}
  .pl-app::after{content:"";position:fixed;inset:0;pointer-events:none;z-index:0;
    background:radial-gradient(800px 500px at 50% 120%,rgba(56,217,208,.05),transparent)}
}
@media(max-width:380px){
  .pl-main{padding-left:11px;padding-right:11px}
  .pl-hero h2{font-size:19px}
  .pl-stat-row{gap:12px}
  .pl-quick b{font-size:10.5px}
}

/* 可访问性：减少动效 */
@media(prefers-reduced-motion:reduce){
  .pl-app *,.pl-app *::before,.pl-app *::after{
    animation-duration:.001ms !important;animation-iteration-count:1 !important;
    transition-duration:.001ms !important;scroll-behavior:auto !important;
  }
}
/* 焦点可见 */
.pl-app a:focus-visible,.pl-app button:focus-visible,.pl-app input:focus-visible{
outline:2px solid var(--pl-cyan);outline-offset:2px;border-radius:6px;
}

/* ============================================================
   独立页面基底
   只有在 <html class="pl-page"> 时才生效，不会影响小怡.xyz 原主题
   ============================================================ */
html.pl-page{background:#060a13}
html.pl-page body{
  margin:0;padding:0;
  background:#060a13;color:#e9effb;
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  -webkit-text-size-adjust:100%;
  overscroll-behavior-y:none;
}
html.pl-page #plRoot{min-height:100vh;min-height:100dvh}

.pl-boot{
  min-height:72vh;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:16px;
  color:#7d8ba5;font-size:12px;letter-spacing:.28em;
}
.pl-boot i{
  width:28px;height:28px;border-radius:50%;
  border:2px solid rgba(255,255,255,.14);border-top-color:#38d9d0;
  animation:plSpin .9s linear infinite;
}
@keyframes plSpin{to{transform:rotate(360deg)}}
@media(prefers-reduced-motion:reduce){.pl-boot i{animation:none;border-top-color:rgba(255,255,255,.5)}}

.pl-noscript{
  max-width:520px;margin:0 auto;padding:18vh 24px 0;
  color:#c3cee2;font-size:14px;line-height:1.95;text-align:center;
}
.pl-noscript b{display:block;margin-bottom:10px;color:#e9effb;font-size:16px}