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var(--line-2);background:var(--page);width:40px;height:40px;color:var(--faint);cursor:pointer;border-radius:50%;font-size:22px;line-height:1;position:absolute;top:14px;right:14px}.fc-star-btn:hover{color:#c58a00;border-color:#c58a00}.fc-star-btn.on{color:#c58a00;background:#fff8e1;border-color:#e7c35a}.fc-star-btn[data-tip]:hover:after,.fc-star-btn[data-tip]:focus-visible:after{content:attr(data-tip);background:var(--ink);color:var(--on-fill);font:500 12px/1.4 var(--font);white-space:nowrap;pointer-events:none;border-radius:4px;padding:3px 8px;position:absolute;top:calc(100% + 6px);right:0}.mark-tip{z-index:79;background:var(--ink);max-width:280px;color:var(--on-fill);font:13px/1.45 var(--font);white-space:pre-wrap;overflow-wrap:anywhere;pointer-events:none;box-shadow:var(--shadow-pop);border-radius:6px;padding:7px 10px;position:fixed}.math-tools{align-items:center;gap:8px;min-height:28px;margin-bottom:6px;display:flex}.math-label,.approach-head>span{color:var(--ink-2);font-size:13px;font-weight:600}.math-tools .eq-btn{margin-left:auto}.eq-btn{border:1px solid var(--line-2);background:var(--page);height:28px;color:var(--ink-2);cursor:pointer;border-radius:6px;align-items:center;gap:4px;padding:0 9px;font-size:12.5px;font-weight:600;display:inline-flex;position:relative}.eq-btn svg{width:15px;height:15px}.eq-btn:hover{border-color:var(--blue);color:var(--blue)}.math-note.compact{position:relative}.math-note.compact .math-tools{z-index:1;min-height:0;margin:0;position:absolute;top:7px;right:7px}.math-note.compact:not(.no-math) textarea{padding-right:44px}.math-tools:empty{display:none}.math-note.compact .eq-btn{height:26px;padding:0 6px}.math-note.compact .eq-btn:hover:after{content:attr(data-tip);z-index:2;background:var(--ink);color:var(--on-fill);font:500 12px/1.4 var(--font);white-space:nowrap;pointer-events:none;border-radius:4px;padding:3px 8px;position:absolute;top:calc(100% + 6px);right:0}.eq-editor{border:1px solid var(--line-2);background:var(--page);box-shadow:var(--shadow);font-family:var(--font);border-radius:8px;margin-top:8px;overflow:hidden}.eq-head{color:var(--ink-2);background:#f2f2f2;border-bottom:1px solid #dcdcdc;align-items:center;gap:8px;padding:6px 8px 6px 12px;font-size:13px;font-weight:600;display:flex}.eq-head>span{margin-right:auto}.eq-row{border-bottom:1px solid #dcdcdc;align-items:stretch;display:flex}.eq-gutter{color:#777;box-shadow:inset -3px 0 0 var(--blue);background:#f5f5f5;border-right:1px solid #dcdcdc;flex:0 0 38px;padding:6px 0 0 8px;font-size:11px}.eq-field{flex:1;min-width:0}.eq-field math-field{background:var(--page);border:0;border-radius:0;outline:none;width:100%;min-height:54px;padding:10px 12px;font-size:21px;display:block}.eq-field math-field::part(virtual-keyboard-toggle),.eq-field math-field::part(menu-toggle){display:none}.eq-msg{margin:0;padding:10px 12px;font-size:13px}.kp{-webkit-user-select:none;user-select:none;background:#e9e9e9;padding:6px 6px 8px}.kp-tabs{gap:2px;margin-bottom:6px;display:flex}.kp-tabs button{color:#555;cursor:pointer;background:0 0;border:0;border-radius:4px;padding:3px 12px;font-size:12.5px;font-weight:600}.kp-tabs button[aria-selected=true]{background:var(--page);color:var(--ink);box-shadow:0 1px 1px #0000001f}.kp-main{grid-template-columns:4fr 4fr 2fr;gap:8px;display:grid}.kp-grid{align-content:start;gap:4px;display:grid}.kp-left,.kp-nums{grid-template-columns:repeat(4,minmax(0,1fr))}.kp-right{grid-template-columns:repeat(2,minmax(0,1fr))}.kp-abc,.kp-letters{gap:4px;display:grid}.kp-key{color:#222;cursor:pointer;min-width:0;height:38px;font:500 16px/1 var(--font);white-space:nowrap;background:#fdfdfd;border:0;border-radius:5px;place-items:center;padding:0 2px;display:grid;box-shadow:0 1px #0000002e}.kp-key:hover{background:#fff;box-shadow:0 1px #0000002e,inset 0 0 0 1px #c9c9c9}.kp-key:active{box-shadow:none;transform:translateY(1px)}.kp-key sup,.kp-key sub{font-size:10px;line-height:0}.kp-var{font-family:var(--serif);font-size:17px;font-style:italic}.kp-left .kp-key,.kp-key.kp-fn{background:#f3f3f3}.kp-key.kp-op{background:#f0f0f0}.kp-key.kp-act{background:#dadada}.kp-key.kp-act.on{background:#bdbdbd}.kp-key.kp-small{font-size:12px;font-weight:600}.kp-key.kp-fn{font-size:14px}.kp-key.kp-enter{background:var(--blue);color:var(--on-fill);font-size:18px}.kp-key.kp-enter:hover{background:var(--blue-hover)}@media(max-width:420px){.kp-key{height:34px;font-size:14px}.kp-main{gap:5px}}.math-preview{border:1px dashed var(--line-2);font-family:var(--serif);white-space:pre-wrap;overflow-wrap:anywhere;border-radius:6px;margin-top:6px;padding:8px 10px;font-size:15px;line-height:1.7}.math-chip{font:inherit;color:inherit;cursor:pointer;vertical-align:middle;background:0 0;border:0;border-radius:4px;margin:0 1px;padding:0 3px;display:inline-block}.math-chip>div{display:inline}.math-chip:hover{background:var(--blue-soft);box-shadow:0 0 0 1px var(--blue)}.approach-head{flex-wrap:wrap;align-items:center;gap:10px;margin-bottom:6px;display:flex}.mode-chips{gap:6px;margin-left:auto}.mode-chips button{min-height:28px;padding:0 11px;font-size:12.5px}.steps ol{gap:8px;margin:0;padding:0;list-style:none;display:grid}.step{grid-template-columns:26px minmax(0,1fr) auto;align-items:start;gap:8px;display:grid}.step-n{background:var(--ink);width:26px;height:26px;color:var(--on-fill);font-variant-numeric:tabular-nums;border-radius:50%;place-items:center;margin-top:8px;font-size:13px;font-weight:700;display:grid}.step textarea{field-sizing:content;resize:none;min-height:42px}.step-tools{gap:2px;margin-top:8px;display:flex}.step-tools button{width:26px;height:26px;color:var(--muted);cursor:pointer;background:0 0;border:0;border-radius:5px;place-items:center;font-size:14px;display:grid}.step-tools button:hover:not(:disabled){background:var(--ink)}@supports (color:color-mix(in lab,red,red)){.step-tools button:hover:not(:disabled){background:color-mix(in srgb,var(--ink) 7%,transparent)}}.step-tools button:hover:not(:disabled){color:var(--ink)}.step-tools button:disabled{opacity:.3;cursor:default}.add-step{margin-top:10px}@property --tw-border-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-shadow-color{syntax:"*";inherits:false}@property --tw-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-inset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-shadow-color{syntax:"*";inherits:false}@property --tw-inset-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-ring-color{syntax:"*";inherits:false}@property --tw-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-ring-color{syntax:"*";inherits:false}@property --tw-inset-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-ring-inset{syntax:"*";inherits:false}@property --tw-ring-offset-width{syntax:"<length>";inherits:false;initial-value:0}@property --tw-ring-offset-color{syntax:"*";inherits:false;initial-value:#fff}@property --tw-ring-offset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-outline-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-blur{syntax:"*";inherits:false}@property --tw-brightness{syntax:"*";inherits:false}@property --tw-contrast{syntax:"*";inherits:false}@property --tw-grayscale{syntax:"*";inherits:false}@property --tw-hue-rotate{syntax:"*";inherits:false}@property --tw-invert{syntax:"*";inherits:false}@property --tw-opacity{syntax:"*";inherits:false}@property --tw-saturate{syntax:"*";inherits:false}@property --tw-sepia{syntax:"*";inherits:false}@property --tw-drop-shadow{syntax:"*";inherits:false}@property --tw-drop-shadow-color{syntax:"*";inherits:false}@property --tw-drop-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-drop-shadow-size{syntax:"*";inherits:false}@property --tw-ease{syntax:"*";inherits:false}