.bt-panel{position:relative}.bt-act{position:relative;z-index:1}.bt-bg{position:absolute;inset:0;z-index:0;pointer-events:none;overflow:hidden}.bt-glow{position:absolute;border-radius:50%;filter:blur(72px);pointer-events:none}.bt-glow-1{width:520px;height:520px;top:-150px;left:-130px;background:radial-gradient(circle,rgba(var(--primary-rgb),.3),transparent 66%);animation:bt-breathe 9s ease-in-out infinite}.bt-glow-2{width:460px;height:460px;top:32%;right:-170px;background:radial-gradient(circle,rgba(var(--primary-rgb),.2),transparent 66%);animation:bt-breathe 12s ease-in-out infinite reverse}.bt-glow-3{width:380px;height:380px;bottom:-130px;left:28%;background:radial-gradient(circle,rgba(var(--primary-rgb),.15),transparent 66%);animation:bt-breathe 10s ease-in-out infinite 1.5s}@keyframes bt-breathe{0%,to{opacity:.5;transform:scale(1)}50%{opacity:.9;transform:scale(1.07)}}.bt-glass{background:color-mix(in srgb,var(--bg-elevated) 66%,transparent)!important;backdrop-filter:blur(14px)!important;-webkit-backdrop-filter:blur(14px)!important;border:1px solid color-mix(in srgb,var(--border) 72%,transparent)!important;box-shadow:var(--shadow-md),inset 0 1px #ffffff59!important}.bt-hero{text-align:center;padding:6px 0 var(--space-5)}.bt-hero-badge{width:66px;height:66px;margin:0 auto var(--space-3);display:flex;align-items:center;justify-content:center;font-size:30px;color:#fff;background:linear-gradient(135deg,var(--primary-light),var(--primary-dark));border-radius:22px;box-shadow:0 10px 28px rgba(var(--primary-rgb),.35),inset 0 1px #ffffff8c;animation:bt-hero-in .5s ease both}@keyframes bt-hero-in{0%{opacity:0;transform:translateY(-12px) scale(.9)}to{opacity:1;transform:translateY(0) scale(1)}}.bt-hero-title{font-size:clamp(32px,5.5vw,46px);font-weight:800;letter-spacing:3px;line-height:1.25;background:linear-gradient(120deg,var(--primary-dark),var(--primary),var(--primary-light));-webkit-background-clip:text;background-clip:text;color:transparent;filter:drop-shadow(0 3px 12px rgba(var(--primary-rgb),.28));margin-bottom:var(--space-3)}.bt-lead{max-width:560px;margin:0 auto;font-size:14.5px;line-height:1.9;color:var(--text-secondary)}.bt-section-title{display:flex;align-items:center;gap:10px;margin:0 0 var(--space-3);font-size:14px;font-weight:700;color:var(--text-secondary)}.bt-section-title:after{content:"";flex:1;height:1px;background:var(--border)}.bt-modes{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-bottom:var(--space-5)}.bt-mode{display:flex;flex-direction:column;align-items:center;gap:8px;padding:18px 8px 14px;min-height:108px;border:1px solid color-mix(in srgb,var(--border) 75%,transparent);border-radius:var(--radius-md);background:color-mix(in srgb,var(--bg-elevated) 62%,transparent);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);box-shadow:var(--shadow-sm),inset 0 1px #fff6;color:var(--text-secondary);font-size:14px;font-weight:600;cursor:pointer;transition:border-color .18s ease,background-color .18s ease,transform .18s ease,box-shadow .18s ease;animation:bt-fade-up .5s ease both}.bt-mode:nth-child(1){animation-delay:.05s}.bt-mode:nth-child(2){animation-delay:.12s}.bt-mode:nth-child(3){animation-delay:.19s}@keyframes bt-fade-up{0%{opacity:0;transform:translateY(14px)}to{opacity:1;transform:translateY(0)}}.bt-mode .bt-mode-ico{width:52px;height:52px;display:flex;align-items:center;justify-content:center;border-radius:50%;background:linear-gradient(145deg,var(--bg-elevated),color-mix(in srgb,var(--bg-elevated) 80%,var(--primary-light)));border:1px solid color-mix(in srgb,var(--border) 80%,transparent);box-shadow:0 4px 12px #3c32141a,inset 0 1px #ffffffb3;font-size:24px;color:var(--text-tertiary);transition:all .18s ease}.bt-mode .bt-mode-desc{font-size:11.5px;font-weight:400;color:var(--text-tertiary);text-align:center;line-height:1.5}.bt-mode:hover{transform:translateY(-3px);border-color:var(--primary)}.bt-mode.active{border-color:var(--primary);background:linear-gradient(160deg,color-mix(in srgb,var(--primary-soft) 70%,var(--bg-elevated)),var(--primary-soft));box-shadow:0 10px 30px rgba(var(--primary-rgb),.28),var(--ring);color:var(--primary-dark)}.bt-mode.active .bt-mode-ico{background:linear-gradient(135deg,var(--primary-light),var(--primary-dark));border-color:var(--primary);color:#fff;box-shadow:0 6px 18px rgba(var(--primary-rgb),.4),inset 0 1px #ffffff80}.bt-settings{display:flex;flex-direction:column;gap:6px;padding:var(--space-4);border:1px solid var(--border);border-radius:var(--radius-md);background:color-mix(in srgb,var(--bg-elevated) 62%,transparent);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);box-shadow:var(--shadow-sm),inset 0 1px #fff6;margin-bottom:var(--space-4)}.bt-setting-row{display:grid;grid-template-columns:92px 1fr auto;align-items:center;gap:14px;padding:4px 0}.bt-setting-row[hidden]{display:none!important}.bt-setting-row label{font-size:13.5px;color:var(--text-secondary)}.bt-setting-control{display:flex;align-items:center;gap:12px}.bt-setting-control input[type=range]{flex:1;accent-color:var(--primary);min-width:120px;-webkit-appearance:none;appearance:none;height:22px;background:transparent;cursor:pointer}.bt-setting-control input[type=range]::-webkit-slider-runnable-track{height:6px;border-radius:3px;background:linear-gradient(90deg,var(--primary-light),color-mix(in srgb,var(--primary) 35%,var(--border)))}.bt-setting-control input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;width:20px;height:20px;margin-top:-7px;border-radius:50%;background:linear-gradient(145deg,#fff,var(--primary-light));border:2px solid var(--primary);box-shadow:0 2px 8px rgba(var(--primary-rgb),.45)}.bt-setting-value{min-width:38px;text-align:center;font-family:var(--font-mono);font-weight:700;font-size:14px;color:var(--primary-dark);background:linear-gradient(145deg,var(--primary-soft),var(--bg-elevated));border:1px solid color-mix(in srgb,var(--primary) 40%,var(--border));border-radius:var(--radius-sm);padding:4px 8px}.bt-options{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;margin-bottom:var(--space-5)}.bt-hint{font-size:12.5px}.bt-option-btns{display:flex;gap:8px}.bt-icon-btn{width:44px;height:44px;display:flex;align-items:center;justify-content:center;border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--bg-elevated);color:var(--text-secondary);font-size:18px;cursor:pointer;transition:border-color .15s ease,color .15s ease}.bt-icon-btn:hover{border-color:var(--primary);color:var(--primary-dark)}.bt-start-btn{position:relative;overflow:hidden;display:flex;align-items:center;justify-content:center;gap:10px;width:100%;min-height:60px;border:none;border-radius:var(--radius-md);background:linear-gradient(120deg,var(--primary-dark),var(--primary));color:#fff;font-size:19px;font-weight:700;letter-spacing:4px;cursor:pointer;box-shadow:var(--shadow-md);transition:transform .15s ease,box-shadow .15s ease,filter .15s ease}.bt-start-btn:before{content:"";position:absolute;inset:0;background:linear-gradient(120deg,transparent 30%,rgba(255,255,255,.38) 50%,transparent 70%);transform:translate(-110%);transition:transform .65s ease;pointer-events:none}.bt-start-btn:hover:before{transform:translate(110%)}.bt-start-btn:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg);filter:brightness(1.05)}.bt-train{position:fixed;inset:0;z-index:60;display:flex;flex-direction:column;background:var(--bg);animation:bt-fade .25s ease}@keyframes bt-fade{0%{opacity:0}to{opacity:1}}.bt-train-bg{position:absolute;inset:0;z-index:0;overflow:hidden;pointer-events:none;background:radial-gradient(130% 100% at 50% 0%,color-mix(in srgb,var(--bg-elevated) 55%,transparent),transparent 62%),radial-gradient(90% 70% at 50% 110%,rgba(var(--primary-rgb),.1),transparent 60%)}.bt-train-bg .bt-glow-1{width:640px;height:640px;top:-220px;left:50%;transform:translate(-50%);background:radial-gradient(circle,rgba(var(--primary-rgb),.26),transparent 66%)}.bt-train-bg .bt-glow-3{width:460px;height:460px;bottom:-180px;left:-140px}.bt-dust{position:absolute;inset:0}.bt-dust-p{position:absolute;left:var(--x);top:58%;width:var(--s, 5px);height:var(--s, 5px);border-radius:50%;background:rgba(var(--primary-rgb),.55);box-shadow:0 0 10px rgba(var(--primary-rgb),.65);opacity:0;animation:bt-float var(--d, 10s) ease-in-out infinite;animation-delay:var(--dl, 0s)}@keyframes bt-float{0%{transform:translateY(0) translate(0);opacity:0}12%{opacity:.7}50%{transform:translateY(-36vh) translate(16px);opacity:.5}85%{opacity:.35}to{transform:translateY(-70vh) translate(-10px);opacity:0}}.bt-train-head,.bt-train-body,.bt-result-inner{position:relative;z-index:1}.bt-train-head{display:flex;align-items:center;justify-content:space-between;gap:14px;padding:14px clamp(16px,4vw,40px)}.bt-exit{width:44px;height:44px;display:flex;align-items:center;justify-content:center;border:1px solid var(--border);border-radius:50%;background:var(--bg-elevated);color:var(--text-secondary);font-size:18px;cursor:pointer;transition:border-color .15s ease,color .15s ease}.bt-exit:hover{border-color:var(--error);color:var(--error)}.bt-train-meta{display:flex;flex-direction:column;align-items:center;gap:2px}.bt-train-mode{font-size:17px;font-weight:700}.bt-train-phase{font-size:12.5px;color:var(--text-tertiary)}.bt-train-right{display:flex;align-items:center;gap:12px}.bt-train-count{font-family:var(--font-mono);font-size:14px;color:var(--text-secondary)}.bt-train-timer{font-family:var(--font-mono);font-size:22px;font-weight:700;color:var(--primary-dark)}.bt-train-body{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:clamp(12px,3vh,24px);padding:clamp(12px,3vw,32px);min-height:0}.bt-stage{position:relative;width:min(100%,720px);flex:1;min-height:240px;border:1px solid color-mix(in srgb,var(--border) 60%,transparent);border-radius:var(--radius-lg);background:color-mix(in srgb,var(--bg-elevated) 42%,transparent);backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px);box-shadow:inset 0 0 60px rgba(var(--primary-rgb),.06),var(--shadow-sm);overflow:hidden}#btCanvas{position:absolute;inset:0;width:100%;height:100%;cursor:crosshair;touch-action:manipulation}.bt-train-status{min-height:26px;text-align:center;font-size:14.5px;color:var(--text-secondary)}.bt-train-status.error{color:var(--error);font-weight:600}.bt-result{position:fixed;inset:0;z-index:70;display:flex;align-items:center;justify-content:center;padding:clamp(16px,4vw,48px);background:color-mix(in srgb,var(--bg) 92%,transparent);backdrop-filter:blur(10px);animation:bt-fade .3s ease}.bt-result-inner{width:min(100%,620px);max-height:92vh;overflow:auto;padding:var(--space-5);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg)}.bt-result-grade{font-size:clamp(40px,8vw,64px);font-weight:800;text-align:center;margin-bottom:var(--space-4);animation:bt-pop .55s cubic-bezier(.2,1.4,.4,1) both;text-shadow:0 6px 28px rgba(var(--primary-rgb),.45)}@keyframes bt-pop{0%{opacity:0;transform:scale(.7)}to{opacity:1;transform:scale(1)}}.bt-result-metrics{display:grid;grid-template-columns:repeat(auto-fit,minmax(120px,1fr));gap:10px;margin-bottom:var(--space-4)}.bt-metric{padding:14px 10px;text-align:center;border:1px solid color-mix(in srgb,var(--border) 70%,transparent);border-radius:var(--radius-sm);background:color-mix(in srgb,var(--bg-secondary) 70%,transparent);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);box-shadow:var(--shadow-xs),inset 0 1px #ffffff59}.bt-metric b{display:block;font-size:24px;background:linear-gradient(120deg,var(--primary-dark),var(--primary));-webkit-background-clip:text;background-clip:text;color:transparent;font-family:var(--font-mono)}.bt-metric b small{font-size:13px;margin-left:2px}.bt-metric span{font-size:12.5px;color:var(--text-tertiary)}.bt-result-note{margin-bottom:var(--space-4);padding:12px 14px;border-radius:var(--radius-sm);background:linear-gradient(120deg,var(--primary-soft),color-mix(in srgb,var(--primary-soft) 50%,var(--bg-elevated)));border:1px solid color-mix(in srgb,var(--primary) 26%,transparent);font-size:14px;line-height:1.7}.bt-result-trend{display:flex;align-items:flex-end;gap:5px;height:120px;padding:12px 10px 24px;border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--bg-secondary);margin-bottom:var(--space-5)}.bt-bar{flex:1;min-width:12px;border-radius:3px 3px 0 0;background:linear-gradient(180deg,var(--primary-light),var(--primary-dark));box-shadow:0 2px 8px rgba(var(--primary-rgb),.2);position:relative}.bt-bar:last-child{box-shadow:0 0 14px rgba(var(--primary-rgb),.55)}.bt-bar:after{content:attr(data-label);position:absolute;bottom:-22px;left:50%;transform:translate(-50%);font-size:10.5px;color:var(--text-tertiary)}.bt-trend-empty{width:100%;display:flex;align-items:center;justify-content:center;color:var(--text-tertiary);font-size:13px}.bt-result-actions{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}.bt-result-actions .btn{min-height:48px;padding:0 26px;font-size:15px}.bt-veil{position:fixed;inset:0;z-index:90;display:flex;align-items:center;justify-content:center;background:color-mix(in srgb,var(--bg) 92%,transparent);backdrop-filter:blur(8px)}.bt-veil[hidden],.bt-toast[hidden],.bt-train[hidden],.bt-result[hidden]{display:none!important}.bt-toast{position:fixed;top:24px;left:50%;transform:translate(-50%);z-index:95;padding:12px 24px;border-radius:var(--radius-full);background:var(--primary-dark);color:#fff;font-size:14.5px;font-weight:600;box-shadow:var(--shadow-lg);animation:bt-toast-in .25s ease}@keyframes bt-toast-in{0%{opacity:0;transform:translate(-50%,-12px)}to{opacity:1;transform:translate(-50%)}}.bt-purpose p{line-height:1.9;margin-bottom:var(--space-4)}.bt-purpose-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px;margin-bottom:var(--space-5)}.bt-purpose-item{display:flex;flex-direction:column;gap:5px;padding:14px;border:1px solid var(--border);border-radius:var(--radius-md);background:var(--bg-secondary)}.bt-purpose-item i{font-size:20px;color:var(--primary-dark);margin-bottom:2px}.bt-purpose-item span{font-size:13px;line-height:1.7;color:var(--text-secondary)}.bt-purpose h4{margin:0 0 10px;font-size:15px}.bt-table-scroll{overflow-x:auto;margin-bottom:var(--space-5)}.bt-bench{width:100%;border-collapse:collapse;font-size:13.5px;min-width:420px}.bt-bench th,.bt-bench td{padding:8px 10px;border:1px solid var(--border);text-align:left}.bt-bench th{background:var(--bg-tertiary);font-weight:600}.bt-tip{display:flex;gap:6px;align-items:flex-start;font-size:13px;line-height:1.7}.bt-tip i{margin-top:2px;color:var(--primary-dark)}[data-theme=dark] .bt-glow-1,[data-theme=dark] .bt-train-bg .bt-glow-1{background:radial-gradient(circle,rgba(var(--primary-rgb),.18),transparent 66%)}[data-theme=dark] .bt-glow-2{background:radial-gradient(circle,rgba(var(--primary-rgb),.13),transparent 66%)}[data-theme=dark] .bt-glow-3{background:radial-gradient(circle,rgba(var(--primary-rgb),.1),transparent 66%)}@media(max-width:640px){.bt-modes{grid-template-columns:1fr}.bt-setting-row{grid-template-columns:1fr;gap:6px}.bt-options{flex-direction:column;align-items:flex-start}.bt-train-head{padding:10px 14px}.bt-train-meta{align-items:flex-start}}@media(prefers-reduced-motion:reduce){.bt-glow,.bt-dust-p,.bt-mode,.bt-hero-badge,.bt-result-grade,.bt-start-btn:before{animation:none!important}.bt-mode{opacity:1;transform:none}}