.practice-host{min-width:0;min-height:0;flex:1;display:flex;color:var(--ink,#303f36)}
.book-practice{width:100%;min-width:0;min-height:0;font-family:var(--sans,"Microsoft YaHei",sans-serif);display:flex;flex-direction:column;--practice-line:var(--line,#c9c6b5)}
.practice-heading{display:flex;align-items:flex-start;justify-content:space-between;gap:12px;margin:0 0 15px}
.practice-heading h3{font-family:var(--serif,serif);font-size:23px;font-weight:500;line-height:1.4;margin:0 0 5px}
.practice-heading span,.practice-history{font-size:10px;color:var(--muted,#75786b);line-height:1.6}
.practice-exit{font:inherit;font-size:11px;white-space:nowrap;min-height:36px;padding:5px 0 5px 12px;background:transparent;border:0;color:inherit;cursor:pointer;text-decoration:underline;text-underline-offset:4px}
.practice-form{display:flex;flex-direction:column;min-height:0;flex:1;gap:12px}
.practice-question{font-size:14px;line-height:1.75;margin:0;font-weight:500;overflow-wrap:anywhere}
.practice-history{margin:-7px 0 10px}
.practice-workspace{min-width:0}
.practice-options{margin:0;padding:0;border:0;display:grid;gap:9px;min-width:0}
.practice-option{display:block;position:relative;min-width:0;cursor:pointer;border:1px solid var(--practice-line);border-radius:3px;background:transparent;transition:background-color .15s,border-color .15s}
.practice-option:has(input:checked){border-color:var(--accent,#536956);background:color-mix(in srgb,var(--accent,#536956) 9%,transparent)}
.practice-option:has(input:focus-visible){outline:2px solid #a2633f;outline-offset:3px}
.practice-option input{position:absolute;width:1px;height:1px;opacity:0;inset:5px auto auto 5px}
.practice-option-inner{display:flex;align-items:center;gap:11px;padding:11px 12px;min-height:43px}
.practice-choice-letter{font:11px var(--sans,sans-serif);color:var(--muted,#75786b);flex-shrink:0;min-width:11px}
.practice-choice-text{font-size:12px;line-height:1.65;overflow-wrap:anywhere}
.practice-judgement{grid-template-columns:1fr 1fr}
.practice-judgement .practice-option-inner{justify-content:center}
.practice-judgement .practice-choice-letter:empty{display:none}
.practice-visuals{grid-template-columns:1fr 1fr;gap:10px}
.practice-visuals .practice-option-inner{flex-direction:column;gap:0;padding:5px 5px 9px}
.practice-option-art{display:block;width:100%;overflow:hidden}
.practice-option-art svg{width:100%;height:auto;display:block;max-height:157px;animation:none!important}
.practice-option-art svg *{animation:none!important;transition:none!important}
.practice-animation{margin:0 0 9px}
.practice-animation-frame{height:145px;overflow:hidden}
.practice-animation-frame svg{display:block;width:100%;height:145px}
.practice-animation-frame .diagram-sequence-label{display:none}
.practice-player-controls{display:flex;align-items:center;gap:13px;min-height:33px;font-size:10px}
.practice-player-controls button{font:inherit;min-height:32px;padding:3px 0;border:0;background:transparent;color:inherit;cursor:pointer;text-decoration:underline;text-underline-offset:3px}
.practice-player-controls span{margin-left:auto;color:var(--muted,#75786b);font-size:9px}
.book-practice.is-submitted .practice-animation{display:none}
.practice-option-art .diagram-caption,.practice-option-art .state-text{display:none}
.practice-visuals .practice-choice-text{font-size:11px}
.practice-answer-mark{display:none;font-size:10px;color:var(--accent,#536956);padding:0 12px 8px}
.practice-option.is-answer .practice-answer-mark{display:block}
.practice-option.is-answer{border-color:var(--accent,#536956)}
.practice-option.is-wrong{border-style:dashed;border-color:#a2633f}
.practice-option:has(input:disabled){cursor:default}
.practice-scene{margin:0 0 3px;max-height:180px;overflow:hidden}
.practice-svg{display:block;width:100%;height:170px;color:var(--ink,#303f36)}
.practice-svg text{font:11px var(--sans,sans-serif);fill:currentColor;stroke:none}
.practice-fill{fill:var(--accent,#536956)}
.practice-shade{fill:currentColor;stroke:none;opacity:.4}
.practice-cone{fill:#91a47d;fill-opacity:.24}
.practice-lamp{fill:#d2bb78}
.practice-range-label{display:flex;justify-content:space-between;align-items:center;font-size:11px;margin:6px 0 3px;color:var(--muted,#75786b)}
.practice-range-label output{color:var(--ink,#303f36);font-size:13px;font-variant-numeric:tabular-nums}
.practice-range{display:block;width:100%;margin:0;min-height:36px;accent-color:var(--accent,#536956);cursor:ew-resize;touch-action:pan-y}
.practice-range:disabled{opacity:.7;cursor:default}
.practice-range-ends{display:flex;justify-content:space-between;gap:15px;font-size:10px;color:var(--muted,#75786b)}
.practice-model-note{font-size:9px;line-height:1.5;text-align:center;color:var(--muted,#75786b);margin:8px 0 0}
.practice-feedback{border-left:2px solid #a2633f;padding:1px 0 1px 12px;font-size:11px;line-height:1.7;outline:none}
.practice-feedback.is-correct{border-color:var(--accent,#536956)}
.practice-feedback strong{display:block;font-size:13px;line-height:1.65;font-weight:500}
.practice-feedback p{margin:5px 0 0;font-size:11px;line-height:1.8;overflow-wrap:anywhere}
.practice-expected{display:block;font-size:10px;margin-top:4px;color:var(--muted,#75786b)}
.practice-actions{display:flex;align-items:center;gap:12px;margin-top:auto;padding-top:3px}
.practice-submit,.practice-reset{font:12px var(--sans,sans-serif);padding:10px 19px;min-height:40px;color:var(--paper,#f4efdf);background:var(--accent,#536956);border:1px solid var(--accent,#536956);border-radius:3px;cursor:pointer}
.practice-submit:disabled{opacity:.38;cursor:default}
.practice-hint{font-size:10px;line-height:1.5;color:var(--muted,#75786b)}
.book-practice [hidden]{display:none!important}
.practice-sr-only{position:absolute;clip:rect(0,0,0,0);clip-path:inset(50%);width:1px;height:1px;overflow:hidden;white-space:nowrap}
.book-practice.is-submitted .practice-heading{margin-bottom:9px}
.book-practice.is-submitted .practice-form{gap:10px}
.book-practice.is-submitted .practice-option-inner{padding-top:7px;padding-bottom:7px;min-height:36px}
.book-practice.is-submitted .practice-option-art svg{max-height:105px}
.book-practice.is-submitted .practice-svg{height:120px}
.book-practice.is-submitted .practice-model-note{display:none}
@media(max-width:820px){.practice-heading{margin-bottom:11px}.practice-heading h3{font-size:21px}.practice-question{font-size:13px;line-height:1.7}.practice-choice-text{font-size:11px}.practice-option-inner{padding:9px 10px;gap:8px}.practice-form{gap:10px}.practice-heading span{font-size:9px}.practice-feedback strong{font-size:12px}.practice-svg{height:155px}}
@media(max-width:620px){.practice-host{min-height:440px}.practice-heading h3{font-size:22px}.practice-question{font-size:14px}.practice-choice-text{font-size:12px}.practice-option-inner{min-height:46px}.practice-form{gap:13px}.practice-feedback p{font-size:12px}.practice-actions{padding-top:8px}.practice-range{min-height:44px}.practice-svg{height:165px}.book-practice.is-submitted .practice-option-inner{min-height:40px}}
@media(prefers-reduced-motion:reduce){.book-practice *{animation:none!important;transition:none!important}}