body{font-family:system-ui,sans-serif}:root{--color-bg:#f5f6f4;--color-surface:#fafaf8;--color-border:#e5e5e2;--color-ink:#2b2b2e;--color-ink-muted:#8a8a86;--color-accent:#2557a7;--color-accent-soft:#e9eef7;--color-muscle-base:#c2453d;--color-muscle-highlight:#ff6b57;--font-sans:-apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--space-xs:.25rem;--space-sm:.5rem;--space-md:1rem;--space-lg:1.5rem;--radius-sm:4px;--radius-md:8px}*,:before,:after{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{font-family:var(--font-sans);color:var(--color-ink)}.app-layout{width:100vw;height:100vh;display:flex}.muscle-nav-sidebar{width:240px;padding:var(--space-md);background:var(--color-surface);color:var(--color-ink);border-right:1px solid var(--color-border);overflow-y:auto}.muscle-nav-sidebar section+section{margin-top:var(--space-sm)}.muscle-nav-sidebar .group-header{align-items:center;gap:var(--space-xs);cursor:pointer;width:100%;padding:var(--space-xs) 0;margin:var(--space-sm) 0 var(--space-xs);text-transform:uppercase;letter-spacing:.04em;color:var(--color-ink-muted);background:0 0;border:none;font-size:.85rem;display:flex}.muscle-nav-sidebar .group-header .chevron{transition:transform .15s;display:inline-block}.muscle-nav-sidebar .group-header[aria-expanded=false] .chevron{transform:rotate(-90deg)}.muscle-nav-sidebar .group-list-wrapper{grid-template-rows:1fr;transition:grid-template-rows .2s;display:grid}.muscle-nav-sidebar .group-list-wrapper.collapsed{grid-template-rows:0fr}.muscle-nav-sidebar .group-list-wrapper>ul{overflow:hidden}.muscle-nav-sidebar ul{margin:0;padding:0;list-style:none}.muscle-nav-sidebar button.muscle-item{text-align:left;width:100%;color:inherit;padding:var(--space-xs) var(--space-sm);cursor:pointer;border-radius:var(--radius-sm);background:0 0;border:none;transition:background-color .15s,color .15s;display:block}.muscle-nav-sidebar button.muscle-item:hover{background:var(--color-accent-soft)}.muscle-nav-sidebar button.muscle-item[aria-pressed=true]{background:var(--color-accent);color:#fff}.scene-container{background:var(--color-bg);flex:1;min-width:0;position:relative}.scene-container canvas{width:100%;height:100%;display:block}.scene-container.hovering-muscle canvas{cursor:pointer}.button-chrome{padding:var(--space-sm) var(--space-md);cursor:pointer;background:var(--color-surface);color:var(--color-ink);border:1px solid var(--color-border);border-radius:var(--radius-sm);font-family:var(--font-sans);font-size:.9rem;transition:background-color .15s,border-color .15s}.button-chrome:hover{background:var(--color-accent-soft);border-color:var(--color-accent)}.reset-view-button{top:var(--space-md);left:var(--space-md);position:absolute}.vessel-toggle{top:var(--space-md);right:var(--space-md);position:absolute}.vessel-toggle[aria-pressed=true]{background:var(--color-accent);color:#fff;border-color:var(--color-accent)}.about-panel{bottom:var(--space-md);left:var(--space-md);background:var(--color-surface);max-width:320px;color:var(--color-ink);border:1px solid var(--color-border);padding:var(--space-sm) .75rem;border-radius:var(--radius-md);font-size:.8rem;position:absolute}.about-panel a{color:var(--color-accent)}.muscle-info-panel{width:320px;padding:var(--space-lg);background:var(--color-surface);border-left:1px solid var(--color-border);animation:.2s panel-in;overflow-y:auto}@keyframes panel-in{0%{opacity:0;transform:translate(12px)}to{opacity:1;transform:translate(0)}}.exercise-list{padding:0;list-style:none}.exercise-list li{margin-bottom:var(--space-md)}.exercise-image{border-radius:var(--radius-sm);border:1px solid var(--color-border);width:100%;max-width:240px;margin-bottom:var(--space-xs);display:block}.exercise-attribution{color:var(--color-ink-muted);font-size:.75rem}.app-status{justify-content:center;align-items:center;gap:var(--space-md);background:var(--color-bg);width:100vw;height:100vh;color:var(--color-ink);flex-direction:column;display:flex}.mobile-menu-button,.sidebar-backdrop{display:none}@media (width<=768px){.mobile-menu-button{top:var(--space-md);left:var(--space-md);z-index:30;justify-content:center;align-items:center;width:40px;height:40px;padding:0;font-size:1.1rem;display:flex;position:absolute}.reset-view-button{top:var(--space-md);left:auto;right:var(--space-md)}.vessel-toggle{top:calc(var(--space-md) * 2 + 40px);right:var(--space-md)}.muscle-nav-sidebar{z-index:40;width:80%;max-width:300px;height:100vh;transition:transform .25s;position:fixed;top:0;left:0;transform:translate(-100%);box-shadow:2px 0 12px #00000026}.muscle-nav-sidebar.mobile-open{transform:translate(0)}.sidebar-backdrop{z-index:35;background:#0006;display:block;position:fixed;inset:0}.muscle-info-panel{border-left:none;border-top:1px solid var(--color-border);border-radius:var(--radius-md) var(--radius-md) 0 0;z-index:25;width:100%;max-height:70vh;animation:.2s panel-in-mobile;position:fixed;inset:auto 0 0}}@keyframes panel-in-mobile{0%{opacity:0;transform:translateY(16px)}to{opacity:1;transform:translateY(0)}}