.rule-overlay[hidden],.rule-modal[hidden]{display:none!important}
.rule-overlay{position:fixed;inset:0;z-index:50;pointer-events:none}
.rule-overlay[aria-hidden="false"]{pointer-events:auto}
.rule-overlay-scrim{position:absolute;inset:0;background:rgba(12,8,31,.56);backdrop-filter:blur(1.5px)}
.rule-fly-stage{position:fixed;perspective:1200px;z-index:2;transition:left .42s cubic-bezier(.2,.8,.2,1),top .42s cubic-bezier(.2,.8,.2,1),width .42s cubic-bezier(.2,.8,.2,1),height .42s cubic-bezier(.2,.8,.2,1),transform .42s cubic-bezier(.2,.8,.2,1)}
.rule-flip-card{position:relative;width:100%;height:100%;transform-style:preserve-3d;transition:transform .65s cubic-bezier(.23,.81,.22,1)}
.rule-flip-card.flipped{transform:rotateY(180deg)}
.rule-flip-face{position:absolute;inset:0;backface-visibility:hidden;-webkit-backface-visibility:hidden;filter:drop-shadow(0 8px 14px #07030f88)}
.rule-flip-face>img{width:100%;height:100%;object-fit:contain;display:block}
.rule-back{transform:rotateY(180deg)}
.rule-front-title{position:absolute;left:14%;right:14%;bottom:8.5%;text-align:center;color:#50385b;font:750 15px/1.15 var(--wordbook-ui-font),serif;text-shadow:0 1px #fff4d5}
.rule-directory{position:absolute;inset:0}
.rule-directory-inner{position:absolute;inset:10% 12% 9%;display:flex;flex-direction:column;gap:6px;color:#443447}
.rule-directory-inner h3{margin:0;text-align:center;color:#533f61;font:700 16px/1.2 var(--wordbook-ui-font),serif}
.rule-directory-search{flex:0 0 29px}.rule-directory-search input{width:100%;height:29px;border:1px solid #d8bb8b;background:#fff5dbcb;border-radius:8px;padding:4px 8px;color:#53455a;font-size:12px;outline:none}
.rule-directory-list{flex:1;min-height:0;overflow-y:auto;-webkit-overflow-scrolling:touch;overscroll-behavior:contain;padding:2px 0;scrollbar-width:none}.rule-directory-list::-webkit-scrollbar{display:none}
.rule-directory-list button{width:100%;display:flex;gap:7px;align-items:center;text-align:left;border:0;border-bottom:1px solid #b3997455;background:transparent;padding:8px 2px;color:#4c3a4e;min-height:48px}
.rule-num{border:1px solid #cda979;border-radius:50%;background:#fff2d6;width:28px;height:28px;flex:0 0 28px;display:grid;place-items:center;font:11px Georgia,serif;color:#5d4553}.rule-info{flex:1;min-width:0}.rule-info b{display:block;font-size:12px;line-height:1.25}.rule-info small{display:block;color:#917c73;font-size:10px;line-height:1.25;margin-top:2px}
.rule-directory-return{align-self:center;border:1px solid #bc9d73;background:#fff1d1e6;color:#513b59;border-radius:14px;font-size:11px;padding:4px 11px}
.rule-modal{position:fixed;inset:0;z-index:70;display:grid;place-items:center;padding:max(10px,env(safe-area-inset-top)) 8px max(10px,env(safe-area-inset-bottom))}
.rule-modal-scrim{position:absolute;inset:0;background:#0a071cc7;backdrop-filter:blur(2px)}
.rule-modal-panel{position:relative;width:min(88vw,370px);aspect-ratio:1/2;max-height:min(88dvh,760px);filter:drop-shadow(0 10px 24px #05020dcc)}.rule-modal-panel>img{position:absolute;inset:0;width:100%;height:100%;object-fit:contain}
.rule-modal-content{position:absolute;inset:11.2% 17% 10.8%;display:flex;flex-direction:column;min-height:0;color:#4b394a}.rule-modal-title{display:flex;align-items:center;gap:6px;justify-content:space-between;flex:none}.rule-modal-title h3{margin:0;font:700 17px/1.3 var(--wordbook-ui-font),serif;color:#523b55}.rule-modal-title button{width:28px;height:28px;border:1px solid #c8a975;border-radius:50%;background:#fff0cddd;color:#5a3e62}.rule-modal-scroll{flex:1;min-height:0;overflow-y:auto;-webkit-overflow-scrolling:touch;padding:8px 1px 4px;font-size:14px;line-height:1.75}.rule-modal-scroll h4{margin:12px 0 5px;color:#6c4b55}.rule-chip-wrap{display:flex;flex-wrap:wrap;gap:5px}.rule-word-chip{border:1px solid #c8a975;background:#fff1d5c9;color:#5b4354;border-radius:13px;padding:6px 9px;font-size:12px}
.shelf-toast{position:fixed;left:50%;bottom:calc(env(safe-area-inset-bottom) + 92px);transform:translate(-50%,12px);opacity:0;z-index:90;background:#261b3de8;border:1px solid #a78972;color:#f7e7c2;padding:7px 11px;border-radius:16px;font-size:12px;transition:.18s;pointer-events:none}.shelf-toast.visible{opacity:1;transform:translate(-50%,0)}
@media(prefers-reduced-motion:reduce){.rule-fly-stage,.rule-flip-card{transition:none!important}}


/* V36 · opening still flies from the selected shelf card to the confirmed 88vw size.
   Closing follows the original prototype's recede/fade feel and never visibly flips front first. */
.rule-overlay{opacity:1;transition:opacity .25s ease}
.rule-overlay.closing{opacity:0}
.rule-fly-stage{opacity:1;transition:left .42s cubic-bezier(.2,.8,.2,1),top .42s cubic-bezier(.2,.8,.2,1),width .42s cubic-bezier(.2,.8,.2,1),height .42s cubic-bezier(.2,.8,.2,1),transform .42s cubic-bezier(.2,.8,.2,1),opacity .25s ease}
.rule-overlay.closing .rule-fly-stage{transition:transform .28s cubic-bezier(.2,.75,.25,1),opacity .24s ease}