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.tool-btn{border-radius:12px;width:44px;min-width:44px;max-width:44px;height:44px;font-size:.88rem}.history-rail-empty{color:var(--toolbar-muted);text-align:center;white-space:nowrap;padding:.25rem 0;font-size:.72rem}.help-guide-container{z-index:1050;box-sizing:border-box;flex-direction:column;align-items:center;width:max-content;display:flex;position:fixed;bottom:.85rem;right:1.25rem}.help-guide-bar{background:var(--toolbar-bg);-webkit-backdrop-filter:blur(18px)saturate(1.3);border:1px solid var(--toolbar-border);box-shadow:var(--shadow);box-sizing:border-box;border-radius:20px;justify-content:center;align-items:center;width:max-content;padding:.35rem;display:flex}.help-guide-toggle{width:32px;min-width:32px;max-width:32px;height:32px;min-height:32px;max-height:32px;color:var(--text-color);cursor:pointer;box-sizing:border-box;-webkit-tap-highlight-color:transparent;touch-action:manipulation;background:0 0;border:1px solid #0000;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;padding:0;transition:background .15s,border-color .15s,color .15s;display:flex}.help-guide-toggle:hover{background:var(--toolbar-surface-strong);border-color:var(--border-color)}.help-guide-toggle.active{background:color-mix(in srgb, var(--accent) 14%, var(--toolbar-bg));border-color:var(--accent);color:var(--accent);box-shadow:0 0 0 1px var(--accent)}.quick-guide-modal{box-sizing:border-box;flex-direction:column;max-width:520px;max-height:85vh;display:flex}.quick-guide-content{flex-direction:column;gap:1.15rem;max-height:calc(85vh - 130px);padding-right:.35rem;display:flex;overflow-y:auto}.quick-guide-section{flex-direction:column;gap:.5rem;display:flex}.quick-guide-section-header{text-transform:uppercase;letter-spacing:.04em;color:var(--toolbar-muted);align-items:center;gap:.45rem;font-size:.85rem;font-weight:700;display:flex}.quick-guide-grid{grid-template-columns:1fr 1fr;gap:.5rem;display:grid}@media (width<=480px){.quick-guide-grid{grid-template-columns:1fr}}.quick-guide-card{background:var(--toolbar-surface);border:1px solid var(--toolbar-border);border-radius:10px;flex-direction:column;gap:.2rem;padding:.65rem .75rem;font-size:.82rem;display:flex}.quick-guide-card strong{color:var(--text-color);font-size:.85rem}.quick-guide-card span{color:var(--toolbar-muted);font-size:.78rem;line-height:1.35}.quick-guide-shortcuts{background:var(--toolbar-surface);border:1px solid var(--toolbar-border);border-radius:10px;flex-direction:column;padding:.4rem .75rem;display:flex}.quick-guide-shortcut-row{border-bottom:1px solid color-mix(in srgb, var(--toolbar-border) 60%, transparent);justify-content:space-between;align-items:center;padding:.45rem 0;font-size:.84rem;display:flex}.quick-guide-shortcut-row:last-child{border-bottom:none}.shortcut-keys{align-items:center;gap:.25rem;font-size:.78rem;display:flex}.shortcut-keys kbd{background:var(--toolbar-surface-strong);border:1px solid var(--toolbar-border);border-radius:5px;padding:.15rem .45rem;font-family:inherit;font-size:.75rem;font-weight:600;box-shadow:0 1px 2px #0000000f}.quick-guide-list{color:var(--toolbar-muted);flex-direction:column;gap:.4rem;margin:0;padding-left:1.25rem;font-size:.82rem;line-height:1.4;display:flex}.quick-guide-list strong{color:var(--text-color)}.quick-guide-footer{width:100%;margin-top:.5rem}