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var(--space-md);font-family:var(--font-body);font-size:var(--text-sm);font-weight:500;color:var(--color-text-muted);background:transparent;border:1px solid var(--color-border);border-radius:var(--radius-md);cursor:pointer;transition:color var(--duration-fast) var(--ease-out),border-color var(--duration-fast) var(--ease-out),background var(--duration-fast) var(--ease-out)}.ratio-calc__reset:hover{color:var(--color-text);border-color:var(--color-border-strong);background:var(--color-bg-alt)}@media(min-width:768px){.ratio-calc{padding:var(--space-xl)}}.bt-wrap{text-align:center;min-height:520px;display:flex;flex-direction:column;align-items:center;justify-content:center}.bt-phase{animation:bt-fadeIn .25s ease-out;width:100%}@keyframes bt-fadeIn{0%{opacity:0}to{opacity:1}}.bt-sound-toggle{position:absolute;top:var(--space-sm);right:var(--space-sm);background:none;border:none;color:var(--color-text-muted);cursor:pointer;padding:var(--space-xs);border-radius:var(--radius-sm);transition:color 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var(--space-sm);border-radius:var(--radius-sm)}.bt-continue-wrap{margin-top:var(--space-md)}.bt-ready-title{font-family:var(--font-heading);font-size:var(--text-2xl);font-weight:700;margin-bottom:var(--space-lg)}.bt-recipe-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(80px,1fr));gap:var(--space-md);margin-bottom:var(--space-xl);text-align:center}.bt-recipe-item{padding:var(--space-md);background:var(--color-bg-alt);border-radius:var(--radius-md)}.bt-recipe-label{display:block;font-size:var(--text-xs);font-weight:600;text-transform:uppercase;letter-spacing:var(--tracking-wide);color:var(--color-text-muted);margin-bottom:var(--space-xs)}.bt-recipe-value{font-size:var(--text-lg);font-weight:700;font-family:"JetBrains Mono",var(--font-mono);color:var(--color-text)}.bt-step-preview{text-align:left;margin-bottom:var(--space-xl)}.bt-step-preview-title{font-size:var(--text-sm);font-weight:600;text-transform:uppercase;letter-spacing:var(--tracking-wide);color:var(--color-text-muted);margin-bottom:var(--space-md)}.bt-step-preview-list{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:var(--space-sm)}.bt-step-preview-item{display:flex;align-items:center;gap:var(--space-sm);font-size:var(--text-sm);color:var(--color-text-secondary);padding:var(--space-sm) var(--space-md);background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-md)}.bt-step-preview-num{display:flex;align-items:center;justify-content:center;width:1.5rem;height:1.5rem;flex-shrink:0;background:var(--color-accent);color:var(--color-bg);font-size:var(--text-xs);font-weight:600;border-radius:var(--radius-full)}.bt-step-preview-label{flex:1;font-weight:500;color:var(--color-text)}.bt-step-preview-dur{font-family:"JetBrains Mono",var(--font-mono);font-size:var(--text-xs);color:var(--color-text-muted)}.bt-ready-actions{display:flex;flex-direction:column;gap:var(--space-sm);align-items:center}.bt-ghost-btn{background:none;border:none;color:var(--color-text-muted);font-size:var(--text-sm);cursor:pointer;padding:var(--space-sm) var(--space-md);transition:color var(--duration-fast) var(--ease-out)}.bt-ghost-btn:hover{color:var(--color-accent)}.bt-recipe-bar{font-size:var(--text-sm);color:var(--color-text-muted);margin-bottom:var(--space-sm);letter-spacing:.02em}.bt-circle-wrap{position:relative;width:190px;height:190px;margin:0 auto var(--space-sm)}.bt-circle-svg{width:100%;height:100%;transform:rotate(-90deg)}.bt-circle-bg{fill:none;stroke:var(--color-bg-alt);stroke-width:8}.bt-circle-progress{fill:none;stroke:var(--color-accent);stroke-width:8;stroke-linecap:round;transition:stroke-dashoffset 1s linear}.bt-circle-center{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);text-align:center}.bt-countdown{display:block;font-family:"JetBrains Mono",var(--font-mono);font-size:2.25rem;font-weight:700;line-height:1;color:var(--color-text);letter-spacing:-.02em}.bt-step-label{display:block;font-size:var(--text-xs);font-weight:500;color:var(--color-text-muted);text-transform:uppercase;letter-spacing:var(--tracking-wide);margin-top:2px}.bt-instruction{font-size:var(--text-sm);color:var(--color-text-secondary);line-height:var(--leading-relaxed);max-width:40ch;margin:0 auto var(--space-sm);height:3.6em;overflow:hidden}.bt-timeline{display:flex;justify-content:center;align-items:center;gap:var(--space-sm);margin-bottom:var(--space-sm);padding:0;list-style:none}.bt-timeline-dot{width:10px;height:10px;border-radius:var(--radius-full);background:var(--color-border);transition:all var(--duration-fast) var(--ease-out)}.bt-timeline-dot--done{background:var(--color-accent)}.bt-timeline-dot--active{background:var(--color-accent);box-shadow:0 0 0 3px var(--color-accent-light);transform:scale(1.3)}.bt-up-next{font-size:var(--text-xs);color:var(--color-text-muted);margin-bottom:var(--space-sm);height:1.4em}.bt-up-next strong{color:var(--color-text-secondary);font-weight:500}.bt-controls{display:flex;align-items:center;justify-content:center;gap:var(--space-lg);margin-bottom:var(--space-md)}.bt-ctrl-btn{display:flex;align-items:center;justify-content:center;border:none;cursor:pointer;transition:all var(--duration-fast) var(--ease-out);line-height:1}.bt-ctrl-main{width:60px;height:60px;border-radius:var(--radius-full);background:var(--color-accent);color:#fff;box-shadow:var(--shadow-md)}.bt-ctrl-main:hover{background:var(--color-accent-hover);transform:scale(1.05)}.bt-ctrl-main:active{transform:scale(.97)}.bt-ctrl-small{width:44px;height:44px;border-radius:var(--radius-full);background:var(--color-bg-alt);color:var(--color-text-secondary)}.bt-ctrl-small:hover{background:var(--color-border);color:var(--color-text)}.bt-instruction-screen{padding:var(--space-md) 0}.bt-instruction-step-label{font-family:var(--font-heading);font-size:var(--text-xl);font-weight:600;margin-bottom:var(--space-md)}.bt-instruction-text{font-size:var(--text-sm);color:var(--color-text-secondary);line-height:var(--leading-relaxed);max-width:40ch;margin:0 auto var(--space-lg)}.bt-complete-icon{width:80px;height:80px;margin:0 auto var(--space-lg);display:flex;align-items:center;justify-content:center;background:var(--color-accent-light);color:var(--color-accent);border-radius:var(--radius-full);animation:bt-scaleIn .4s ease-out}@keyframes bt-scaleIn{0%{transform:scale(0);opacity:0}to{transform:scale(1);opacity:1}}.bt-complete-heading{font-family:var(--font-heading);font-size:var(--text-2xl);font-weight:700;margin-bottom:var(--space-sm)}.bt-complete-time{font-family:"JetBrains Mono",var(--font-mono);font-size:var(--text-lg);color:var(--color-text-muted);margin-bottom:var(--space-xl)}.bt-complete-actions{display:flex;flex-direction:column;gap:var(--space-sm);align-items:center}@media(prefers-reduced-motion:reduce){.bt-phase,.bt-complete-icon{animation:none}.bt-circle-progress{transition:none}.bt-timeline-dot--active{transform:none}}@media(min-width:520px){.bt-method-grid{flex-direction:row}.bt-method-card{flex:1}.bt-circle-wrap{width:220px;height:220px}.bt-countdown{font-size:2.75rem}}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.muted{color:var(--color-text-muted)}.small{font-size:var(--text-sm);color:var(--color-text-muted)}.text-center{text-align:center}.text-balance{text-wrap:balance}.back{display:inline-flex;align-items:center;gap:var(--space-xs);font-size:var(--text-sm);font-weight:500;color:var(--color-text-muted);margin-bottom:var(--space-lg);transition:color var(--duration-fast) var(--ease-out)}.back:hover{color:var(--color-accent);text-decoration:none}.cross-links{display:flex;flex-wrap:wrap;gap:var(--space-sm);margin-bottom:var(--space-xl)}.cross-links a{display:inline-flex;align-items:center;padding:var(--space-xs) var(--space-md);font-size:var(--text-sm);font-weight:500;color:var(--color-text-secondary);background:var(--color-bg-alt);border-radius:var(--radius-full);transition:all var(--duration-fast) var(--ease-out)}.cross-links a:hover{background:var(--color-accent-light);color:var(--color-accent);text-decoration:none}.link-list{list-style:none;padding:0;margin:0}.link-list li{margin-bottom:var(--space-sm)}.link-list a{font-weight:500}.breadcrumb{display:flex;align-items:center;flex-wrap:wrap;gap:var(--space-xs);font-size:var(--text-sm);color:var(--color-text-muted);margin-bottom:var(--space-lg)}.breadcrumb a{color:var(--color-text-muted);transition:color var(--duration-fast) var(--ease-out)}.breadcrumb a:hover{color:var(--color-accent)}.breadcrumb span[aria-hidden]{color:var(--color-border-strong)}.section{margin-bottom:var(--space-3xl)}.section:last-child{margin-bottom:0}.grid{display:grid;gap:var(--space-md)}.grid--2{grid-template-columns:repeat(auto-fill,minmax(280px,1fr))}.grid--3{grid-template-columns:repeat(auto-fill,minmax(240px,1fr))}.details{display:grid;grid-template-columns:auto 1fr;gap:var(--space-sm) var(--space-lg)}.details dt{font-size:var(--text-sm);font-weight:600;color:var(--color-text-muted)}.details dd{margin:0}