.f-lp{background:var(--f-bg);flex-direction:column;min-height:100dvh;display:flex}.f-lp-top{z-index:20;background:var(--f-bg);padding:0 var(--f-gutter);position:sticky;top:0}.f-lp-top-inner{height:52px;max-width:var(--f-content);align-items:center;gap:14px;margin-inline:auto;display:flex}.f-lp-close{color:var(--f-text-2);transition:color var(--f-dur-micro) var(--f-ease-ui);flex:none;margin:0 0 0 -12px}.f-lp-close:hover{color:var(--f-ink)}.f-lp-progress{flex:1;min-width:0}.f-lp-counter{text-align:right;min-width:44px;color:var(--f-text-2);font-variant-numeric:tabular-nums;flex:none;font-size:13px}.f-lp-lesson-title{display:none}.f-lp-body{width:100%;max-width:calc(var(--f-content) + 2 * var(--f-gutter));padding:12px var(--f-gutter) 0;flex-direction:column;flex:1;gap:20px;margin-inline:auto;display:flex}.f-lp-stage{width:100%;transition:opacity var(--f-dur-step-out) var(--f-ease-ui);justify-content:center;display:flex}.f-lp-stage>.ff{width:100%;max-width:min(680px, calc((60vh - 96px) * var(--f-lp-aspect,1)));margin-inline:auto}.f-lp-stage .ff-caption{margin-top:16px}.f-lp[data-screen-kind=predict] .f-lp-stage>.ff{max-width:min(680px, calc(38vh * var(--f-lp-aspect,1)))}.f-lp--reference .f-lp-stage>.ff{max-width:min(420px, calc(28vh * var(--f-lp-aspect,1)))}.f-lp--reference .f-lp-stage .ff-caption{margin-top:10px;font-size:.88em}.f-lp--reference .f-lp-stage .ff-readout{font-size:13px}.f-lp-reference-toggle{margin:20px 0 0}.f-lp-rail,.flow-root .f-lp-rail:focus-visible{transition:opacity var(--f-dur-step-out) var(--f-ease-ui);outline:none;min-width:0}.f-lp-stage.is-caption-pending .ff-caption{visibility:hidden}.f-lp-stage.is-leaving,.f-lp-rail.is-leaving{opacity:0}.f-lp-rail-inner{flex-direction:column;gap:18px;min-width:0;display:flex}.f-lp--text .f-lp-body{max-width:calc(720px + 2 * var(--f-gutter));padding-top:20px}.f-lp-kicker{color:var(--f-text-2);margin:0 0 6px;font-size:13px;line-height:18px}.f-lp-count{color:var(--f-text-3);font-variant-numeric:tabular-nums;margin-left:6px}.f-lp-prompt-text{font-size:var(--f-body-size);line-height:var(--f-body-line);color:var(--f-ink);max-width:var(--f-measure)}.f-lp-prompt-text.f-muted{color:var(--f-text-2)}.f-lp-stem{color:var(--f-text)}.f-lp-hint{color:var(--f-text-2);margin:-6px 0 0}.f-lp-explain{border-top:1px solid var(--f-rule);color:var(--f-text);max-width:var(--f-measure);padding-top:16px}.f-lp-verdict{gap:12px;scroll-margin-bottom:96px;display:grid}.f-lp-verdict-more{gap:8px;padding:0 4px;display:grid}.f-lp-choices{gap:10px;display:grid}.f-lp-choices:focus{outline:none}.f-lp-choice{text-align:left;background:var(--f-surface);width:100%;min-height:52px;color:var(--f-text);border:1px solid var(--f-rule);border-radius:var(--f-r);font-family:var(--f-serif);font-size:var(--f-body-size);cursor:pointer;transition:border-color var(--f-dur-micro) var(--f-ease-ui);grid-template-columns:16px 1fr auto;align-items:center;gap:14px;padding:12px 16px;line-height:24px;display:grid}.f-lp-choice:hover{border-color:var(--f-rule-2)}.f-lp-choice[aria-disabled=true]{cursor:default}.f-lp-choice.is-selected{border:1.5px solid var(--f-ink);padding:11.5px 15.5px}.f-lp-choice.is-correct,.f-lp-choice.is-retry,.f-lp-choice.is-final-miss,.f-lp-choice.is-answer{border-left-width:3px;padding-left:14px}.f-lp-choice.is-correct,.f-lp-choice.is-answer{border-left-color:var(--f-accent)}.f-lp-choice.is-retry{border-left-color:var(--f-amber)}.f-lp-choice.is-final-miss{border-left-color:var(--f-red)}.f-lp-ring{border:1.5px solid var(--f-text-2);border-radius:50%;width:14px;height:14px;position:relative}.f-lp-choice.is-selected .f-lp-ring{border-color:var(--f-ink)}.f-lp-choice.is-selected .f-lp-ring:after{content:"";background:var(--f-ink);border-radius:50%;position:absolute;inset:2.5px}.f-lp-choice-text{overflow-wrap:anywhere;min-width:0}.f-lp-choice-tag{font-family:var(--f-sans);color:var(--f-accent);font-size:13px}.f-lp-numeric{align-items:center;gap:16px;min-width:0;display:flex}.f-lp-numeric-input{background:var(--f-bg);width:100%;max-width:240px;height:52px;color:var(--f-ink);border:1px solid var(--f-rule-2);border-radius:var(--f-r);font-family:var(--f-serif);font-variant-numeric:tabular-nums lining-nums;transition:border-color var(--f-dur-micro) var(--f-ease-ui);padding:0 14px;font-size:22px}.f-lp-numeric-input::placeholder{color:var(--f-text-3);font-size:17px}.f-lp-numeric-input:focus{border-color:var(--f-ink);outline:none}.f-lp-numeric.is-correct .f-lp-numeric-input{border-color:var(--f-accent)}.f-lp-numeric.is-retry .f-lp-numeric-input{border-color:var(--f-amber)}.f-lp-numeric.is-final-miss .f-lp-numeric-input{border-color:var(--f-red)}.f-lp-numeric-preview{color:var(--f-text-2);min-width:0}.f-lp-options .f-option-note{margin-bottom:6px}.f-lp-pace{color:var(--f-text);font-variant-numeric:tabular-nums lining-nums;flex-wrap:wrap;align-items:baseline;gap:4px 8px;margin:0;display:flex}.f-lp-pace-label{color:var(--f-text-2);font-size:13px}.f-lp-pace-sep{background:var(--f-rule-2);align-self:center;width:1px;height:12px;margin:0 6px}.f-lp-solution{border-top:1px solid var(--f-rule);padding-top:16px}.f-lp-steps{counter-reset:step;gap:10px;margin:0;padding:0;list-style:none;display:grid}.f-lp-steps li{counter-increment:step;font-size:var(--f-small-size);color:var(--f-text);grid-template-columns:22px 1fr;gap:8px;line-height:24px;display:grid}.f-lp-steps li:before{content:counter(step);font-family:var(--f-sans);color:var(--f-text-3);font-size:13px}.f-lp-drill-dots{gap:10px;margin:-6px 0 0;padding:0;list-style:none;display:flex}.f-lp-drill-dots li{border:1.5px solid var(--f-rule-2);border-radius:50%;width:10px;height:10px}.f-lp-drill-dots li.is-current{border-color:var(--f-ink)}.f-lp-drill-dots li.is-correct{border-color:var(--f-accent);background:var(--f-accent)}.f-lp-drill-dots li.is-retried{border-color:var(--f-accent)}.f-lp-drill-dots li.is-final-miss{border-color:var(--f-red)}.f-lp-drill-item{gap:16px;display:grid}.f-lp-drill-text{color:var(--f-ink);font-size:20px;line-height:30px}.f-lp-tray{flex-wrap:wrap;gap:8px;min-height:8px;display:flex}.f-lp-chip{background:var(--f-surface);max-width:100%;color:var(--f-text);border:1px solid var(--f-rule-2);border-radius:var(--f-r);font-family:var(--f-serif);text-align:left;cursor:grab;touch-action:none;-webkit-user-select:none;user-select:none;transition:border-color var(--f-dur-micro) var(--f-ease-ui);padding:10px 14px;font-size:16px;line-height:22px;position:relative}.f-lp-chip.is-selected{border:1.5px solid var(--f-ink);padding:9.5px 13.5px}.f-lp-chip.is-dragging{z-index:30;cursor:grabbing;border-color:var(--f-ink);transition:none}.f-lp-groups{gap:10px;display:grid}@media (min-width:640px){.f-lp-groups[data-count="4"],.f-lp-groups[data-count="2"]{grid-template-columns:1fr 1fr}.f-lp-groups[data-count="3"]{grid-template-columns:1fr 1fr 1fr}}.f-lp-group{border:1px dashed var(--f-rule-2);border-radius:var(--f-r);min-height:88px;transition:border-color var(--f-dur-micro) var(--f-ease-ui);flex-direction:column;display:flex}.f-lp-group.is-armed{border-style:solid}.f-lp-group.is-hover,.f-lp-group.is-armed:hover{border-color:var(--f-ink)}.f-lp-group-head{width:100%;color:var(--f-ink);font-family:var(--f-sans);text-align:left;cursor:pointer;background:0 0;border:0;justify-content:space-between;align-items:baseline;gap:8px;padding:12px 14px 8px;font-size:14px;font-weight:500;line-height:20px;display:flex}.f-lp-group-head:disabled{cursor:default;color:var(--f-text)}.f-lp-group-count{color:var(--f-text-3);font-size:13px}.f-lp-group-items{gap:6px;margin:0;padding:0 10px 10px;list-style:none;display:grid}.f-lp-placed{background:var(--f-surface);border:1px solid var(--f-rule);border-left:3px solid var(--f-accent);border-radius:var(--f-r-sm);justify-content:space-between;align-items:center;gap:10px;padding:8px 10px;font-size:15px;line-height:22px;display:flex}.f-lp-placed.is-retried{border-left-color:var(--f-accent)}.f-lp-placed.is-final-miss{border-left-color:var(--f-red)}.f-lp-placed-text{overflow-wrap:anywhere;min-width:0}.f-lp-placed-figure{flex:none;width:72px}.f-lp-placed-figure .ff{max-width:72px}.f-lp-placed-figure .ff-readout{display:none}.f-lp-lines{gap:8px;margin:0;padding:0;list-style:none;display:grid}.f-lp-line{background:var(--f-surface);width:100%;min-height:52px;color:var(--f-text);border:1px solid var(--f-rule);border-radius:var(--f-r);font-family:var(--f-serif);text-align:left;grid-template-columns:22px 1fr auto;align-items:center;gap:10px;padding:8px 8px 8px 14px;font-size:16px;line-height:24px;display:grid}.f-lp-line--tap{cursor:pointer;transition:border-color var(--f-dur-micro) var(--f-ease-ui);grid-template-columns:22px 1fr;padding:12px 16px}.f-lp-line--tap:hover{border-color:var(--f-rule-2)}.f-lp-line.is-selected{border:1.5px solid var(--f-ink)}.f-lp-line.is-correct,.f-lp-line.is-answer,.f-lp-line.is-retry,.f-lp-line.is-final-miss{border-left-width:3px}.f-lp-line.is-correct,.f-lp-line.is-answer{border-left-color:var(--f-accent)}.f-lp-line.is-retry{border-left-color:var(--f-amber)}.f-lp-line.is-final-miss{border-left-color:var(--f-red)}.f-lp-lines--order.is-done .f-lp-line{grid-template-columns:22px 1fr}.f-lp-line-num{color:var(--f-text-3);font-variant-numeric:tabular-nums;font-size:13px}.f-lp-line-text{overflow-wrap:anywhere;min-width:0}.f-lp-move{display:flex}.f-lp-move .f-icon-button{width:40px;height:40px;color:var(--f-text-2);margin:0}.f-lp-move .f-icon-button:disabled{opacity:.3;cursor:default}.f-lp-move .f-icon-button:not(:disabled):hover{color:var(--f-ink)}.f-lp-dock{z-index:10;margin:4px calc(-1 * var(--f-gutter)) 0;padding:12px var(--f-gutter) calc(12px + env(safe-area-inset-bottom,0px));background:var(--f-bg);border-top:1px solid var(--f-rule);position:sticky;bottom:0}.f-lp-dock-inner{gap:8px;display:grid}.f-lp-dock-hint{color:var(--f-text-2);text-align:center;font-size:13px;line-height:18px}.f-lp-dock-actions{gap:10px;display:flex}.f-lp-dock-actions .f-lp-dock-primary{flex:1}.f-lp-dock-primary[aria-disabled=true]{pointer-events:none}.f-lp-more-below{z-index:11;min-height:32px;color:var(--f-text);background:var(--f-surface);border:1px solid var(--f-rule-2);cursor:pointer;animation:f-lp-more-in var(--f-dur-ui,.2s) var(--f-ease-ui,ease) both;border-radius:999px;align-items:center;gap:6px;padding:6px 14px;font-size:13px;display:inline-flex;position:fixed;left:50%;transform:translate(-50%)}@keyframes f-lp-more-in{0%{opacity:0}to{opacity:1}}@media (prefers-reduced-motion:reduce){.f-lp-more-below{animation:none}}.f-lp-controls-slot:empty{display:none}.f-lp-controls-slot .ff-controls--rail{border-top:1px solid var(--f-rule);margin:0;padding:16px 0 4px}.f-lp-picker{border:1px solid var(--f-rule);border-radius:var(--f-r);gap:8px;padding:12px;display:grid}.f-lp-picker-options{flex-wrap:wrap;gap:8px;display:flex}.f-lp-picker-option{border:1px solid var(--f-text-3);border-radius:var(--f-r);min-height:44px;color:var(--f-ink);font:inherit;cursor:pointer;background:0 0;padding:8px 14px}.f-lp-picker-option:hover,.f-lp-picker-option:focus-visible{border-color:var(--f-ink)}.f-lp-save{border:1px solid var(--f-rule);border-radius:var(--f-r);justify-items:start;gap:12px;padding:16px;display:grid}.f-lp-recap{gap:20px;padding-bottom:32px;display:grid}.f-lp-recap-title{margin-top:-8px}.f-lp-rule{color:var(--f-ink);max-width:var(--f-measure);font-size:20px;line-height:30px}.f-lp-recap-tex{font-size:var(--f-caption-size);color:var(--f-ink)}.f-lp-stats{border-top:1px solid var(--f-rule);grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin:0;padding-top:16px;display:grid}.f-lp-stats dt{color:var(--f-text-2);font-size:13px;line-height:18px}.f-lp-stats dd{color:var(--f-ink);font-variant-numeric:tabular-nums lining-nums;margin:4px 0 0;font-size:20px;line-height:26px}.f-lp-mistakes ul{gap:10px;margin:0;padding:0;list-style:none;display:grid}.f-lp-mistakes li{grid-template-columns:auto 1fr;column-gap:4px;font-size:16px;display:grid}.f-lp-mistake-remedy{grid-column:1/-1}.f-lp-review-note{margin:0}.f-lp-recap-actions{flex-wrap:wrap;align-items:center;gap:10px;display:flex}.f-lp-locked{gap:16px;max-width:640px;padding-top:48px;display:grid}@media (min-width:1000px){.f-lp-top-inner{gap:20px;height:56px}.f-lp-lesson-title{text-overflow:ellipsis;white-space:nowrap;max-width:300px;color:var(--f-text-2);flex:0 auto;font-size:13px;display:block;overflow:hidden}.f-lp--figure .f-lp-body{column-gap:var(--f-col-gap);grid-template-columns:repeat(12,minmax(0,1fr));align-items:start;padding-top:28px;padding-bottom:48px;display:grid}.f-lp--figure .f-lp-stage{grid-column:1/span 7;position:sticky;top:104px}.f-lp--figure .f-lp-stage>.ff{max-width:min(640px, calc((100vh - 230px) * var(--f-lp-aspect,1)))}.f-lp--figure .f-lp-rail{grid-column:8/span 5;padding-top:28px}.f-lp--reference .f-lp-stage{grid-column:1/span 5}.f-lp--reference .f-lp-stage>.ff{max-width:min(460px, calc((100vh - 280px) * var(--f-lp-aspect,1)))}.f-lp--reference .f-lp-rail{grid-column:6/span 7}.f-lp[data-screen-kind=predict] .f-lp-stage>.ff{max-width:min(640px, calc((100vh - 230px) * var(--f-lp-aspect,1)))}.f-lp--text .f-lp-body{padding-top:40px;padding-bottom:48px}.f-lp-dock{border-top:0;margin:8px 0 0;padding:16px 0 24px}.f-lp-dock-inner{justify-items:start}.f-lp-dock-hint{text-align:left;order:2}.f-lp-dock-actions .f-lp-dock-primary{flex:none;min-width:140px}.f-lp-drill-text{font-size:22px;line-height:32px}}@media (max-width:767px){.f-lp-stage.is-caption-pending .ff-caption,.f-lp-stage .ff-readout.is-concealed,.f-lp--reference .f-lp-stage .ff-caption{display:none}.f-lp-stage .ff-controls{margin-top:8px}.f-lp-controls-slot .ff-controls--rail{padding-top:12px}.f-lp-stage .ff-controls>div[style],.f-lp-controls-slot .ff-controls>div[style]{gap:2px!important}.f-lp-controls-slot .ff-scrubber,.f-lp-stage .ff-scrubber{grid-template-columns:minmax(4.5em,auto) minmax(0,1fr);align-items:center;gap:0 10px;padding-bottom:14px}.f-lp-controls-slot .ff-scrubber-readout,.f-lp-stage .ff-scrubber-readout{text-align:left;white-space:nowrap;font-size:13px}}.f-lp-show-options{align-self:flex-start;margin:10px 0 0}@media (max-width:767px){.f-lp[data-screen-kind=sort] .f-lp-stage>.ff{max-width:min(680px, calc(30vh * var(--f-lp-aspect,1)))}.f-lp[data-sticky-stage=true] .f-lp-stage{z-index:10;background:var(--f-bg);border-bottom:1px solid var(--f-rule);padding-bottom:8px;position:sticky;top:52px}.f-lp[data-screen-kind=predict][data-sticky-stage=true] .f-lp-stage>.ff{max-width:min(680px, calc(28vh * var(--f-lp-aspect,1)))}}
