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p{color:var(--muted);margin:0;padding:0 0 17px;font-size:13px;line-height:1.6}.article-shell{max-width:780px;margin:auto}.article-top{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;margin-bottom:18px;display:flex}.sport-switch-mini{flex-wrap:wrap;gap:6px;display:flex}.sport-switch-mini a{background:var(--panel);color:var(--muted);box-shadow:0 1px 0 var(--line);border-radius:999px;padding:8px 12px;font-size:12px;font-weight:700;text-decoration:none}.sport-switch-mini a.on{background:var(--ink);color:var(--bg)}.article-page{background:var(--panel);box-shadow:var(--shadow);border-radius:26px;display:none;overflow:hidden}.article-page.active{display:block}.article-body{padding:clamp(21px,5vw,42px)}.article-body h1{margin:6px 0 8px;font-size:clamp(30px,5vw,44px)}.article-body h2{align-items:center;gap:10px;margin-top:30px;font-size:20px;display:flex}.article-body ul{padding-left:20px}.article-body li{color:var(--muted);font-size:15px;line-height:1.7}.article-body li+li{margin-top:8px}.rule-number{color:var(--accent);font:800 13px/1 DM Sans}.article-callout{background:var(--panel-2);border-radius:16px;margin:22px 0;padding:17px}.article-callout p{margin:0;font-size:14px}.rule-basis{color:var(--muted);border-top:1px solid var(--line);flex-wrap:wrap;justify-content:space-between;gap:10px;padding-top:16px;font-size:12px;display:flex}.source-note{flex-wrap:wrap;gap:14px;margin-top:10px;display:flex}.source-note a{color:var(--accent);font-size:13px;font-weight:700}@media (max-width:680px){.learn-grid{grid-template-columns:1fr}.article-page{border-radius:20px}.article-body{padding:20px}}.court{aspect-ratio:2;background:#1b7958b3;border:3px solid #ffffffe6;width:min(100%,460px);margin:22px auto 0;position:relative;box-shadow:inset 0 0 0 2px #ffffff21}.court:before{content:"";border-left:3px solid #ffffffe6;position:absolute;top:0;bottom:0;left:50%}.court:after{content:"";border-top:2px solid #ffffff9e;position:absolute;top:50%;left:0;right:0}.rule-studio{background:var(--panel);box-shadow:0 1px 0 var(--line);border-radius:26px;margin-bottom:27px;padding:22px}.rule-studio-head{justify-content:space-between;align-items:flex-end;gap:18px;margin-bottom:16px;display:flex}.sport-switch{flex-wrap:wrap;gap:7px;display:flex}.sport-tab{border:1px solid var(--line);background:var(--bg);cursor:pointer;border-radius:12px;padding:10px 12px;font-size:12px;font-weight:800}.sport-tab.active{background:var(--ink);color:var(--bg);border-color:var(--ink)}.sport-tab:disabled{cursor:not-allowed;opacity:.52}.sport-tab small{color:var(--muted);margin-top:2px;font-size:9px;font-weight:700;display:block}.sport-tab.active small{color:inherit;opacity:.7}.view-toggle{border:1px solid var(--line);background:var(--panel-2);border-radius:12px;gap:4px;margin-bottom:12px;padding:4px;display:inline-flex}.view-tab{cursor:pointer;color:var(--muted);background:0 0;border:0;border-radius:9px;padding:8px 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#dafa6852}.court-ball{background:#f5ee61;border-radius:50%;width:13px;height:13px;position:absolute;bottom:25%;left:20%;box-shadow:0 2px 8px #00000059}.court-ball.play{animation:1.35s cubic-bezier(.45,.04,.58,1) both ruleRally}.rule-caption{justify-content:space-between;align-items:center;gap:14px;margin-top:16px;font-size:12px;display:flex;position:relative}.rule-caption strong{font-size:13px}.rule-caption button{color:#171914;cursor:pointer;background:#fff;border:0;border-radius:10px;padding:9px 12px;font-weight:800}.rule-steps{gap:6px;margin-bottom:14px;display:flex}.rule-step{background:var(--panel-2);cursor:pointer;border:0;border-radius:10px;flex:1;padding:9px 7px;font-size:11px;font-weight:800}.rule-step.active{background:var(--accent);color:var(--accent-ink)}.rule-explain{min-height:138px;padding:4px 2px}.rule-explain h3{font-size:21px}.rule-explain p{color:var(--muted);font-size:13px;line-height:1.55}.memory-cue{background:var(--blue-bg);color:var(--blue);border-radius:13px;align-items:flex-start;gap:9px;padding:12px;font-size:12px;font-weight:700;display:flex}.score-trainer{border-top:1px solid var(--line);margin-top:16px;padding-top:16px}.score-board{grid-template-columns:1fr auto auto;align-items:center;gap:9px;margin:12px 0;display:grid}.score-board span{font-size:12px;font-weight:800}.score-value{text-align:center;background:var(--panel-2);border-radius:9px;min-width:43px;padding:8px;font:800 16px/1 Manrope}.score-server{color:var(--green);font-size:10px!important}.score-actions{grid-template-columns:1fr 1fr;gap:7px;display:grid}.score-actions button{background:var(--ink);color:var(--bg);cursor:pointer;border:0;border-radius:10px;padding:10px;font-size:11px;font-weight:800}.score-reset{color:var(--muted);cursor:pointer;background:0 0;border:0;margin-top:9px;padding:4px 0;font-size:11px;font-weight:800}.rule-studio{padding:24px}.rule-studio-head{align-items:flex-start}.sport-switch{max-width:620px}.sport-tab{text-align:left;min-width:105px}.sport-tab small{font-variant-numeric:tabular-nums}.rule-stage{grid-template-columns:minmax(0,1.22fr) minmax(300px,.78fr)}.court-demo{background:#102d28;flex-direction:column;justify-content:space-between;min-height:420px;padding:22px;display:flex}.court-wrap{z-index:1;position:relative}.court:before,.court:after,.service-lines:before,.service-lines:after{content:none}.court-lines{pointer-events:none;display:block;position:absolute;inset:0}.court-line{background:#ffffffeb;display:block;position:absolute}.court-line.v{width:2px;top:0;bottom:0;transform:translate(-1px)}.court-line.h{height:2px;transform:translateY(-1px)}.court-line.net{background:#fff;width:4px;top:-4%;bottom:-4%;left:50%;transform:translate(-2px);box-shadow:0 0 0 1px #0003}.court-line.secondary{background:#ffffffb8}.court-zone{background:#eccf5033;position:absolute}.court-label{color:#ffffffe6;letter-spacing:.04em;text-transform:uppercase;text-shadow:0 1px 2px #0006;font:800 9px/1 DM Sans;position:absolute}.court-material{z-index:2;pointer-events:none;position:absolute}.court-material.glass{background:#b4e5ee6b;border:1px solid #dcf9ffe6}.court-material.mesh{background-color:#142d2861;background-image:repeating-linear-gradient(45deg,#ffffff57 0 1px,#0000 1px 5px),repeating-linear-gradient(-45deg,#ffffff3d 0 1px,#0000 1px 5px);border:1px solid #ffffff8f}.material-label{z-index:3;color:#fff;letter-spacing:.04em;text-transform:uppercase;background:#081d1ad6;border-radius:5px;padding:3px 5px;font:800 7px/1 DM Sans;position:absolute}.court-player{z-index:4;width:23px;height:23px}.court[data-sport=padel] .court-player.a,.court[data-sport=tennis] .court-player.a,.court[data-sport=pickleball] .court-player.a,.court[data-sport=badminton] .court-player.a{bottom:15%;left:7%}.court[data-sport=padel] .court-player.b,.court[data-sport=tennis] .court-player.b,.court[data-sport=pickleball] .court-player.b,.court[data-sport=badminton] .court-player.b{top:15%;right:7%}.court[data-sport=squash] .court-player.b{top:24%;right:18%}.court-player.a.serve-left{top:15%;bottom:auto}.court-player.b.receive-left{top:auto;bottom:15%}.court[data-sport=squash] .court-player.a.serve-left{top:16%;bottom:auto;left:61%}.court[data-sport=squash] .court-player.a{bottom:16%;left:61%}.court[data-sport=squash] .court-player.b.receive-left{top:auto;bottom:24%;right:18%}.court-ball{z-index:5;bottom:25%;left:12%}.dimension-strip{color:#ffffffbd;justify-content:space-between;gap:12px;width:min(100%,570px);margin:10px auto 0;font-size:11px;display:flex}.dimension-strip strong{color:#fff}.rule-caption{margin-top:20px}.rule-panel{flex-direction:column;display:flex}.rule-heading{align-items:center;gap:10px;display:flex}.rule-number{background:var(--accent);width:30px;height:30px;color:var(--accent-ink);border-radius:50%;place-items:center;font:800 11px/1 Manrope;display:grid}.rule-heading h3{margin:0}.rule-explain{min-height:176px}.memory-cue span:first-child{flex:none}.rule-basis{border-top:1px solid var(--line);color:var(--muted);justify-content:space-between;gap:10px;margin-top:auto;padding-top:13px;font-size:10px;display:flex}.court-ball{transition:none;top:69%;bottom:auto}.court-ball.demo-serve,.court-ball.demo-rally{animation-duration:4.4s;animation-timing-function:linear;animation-fill-mode:both}.court-ball.demo-serve[data-demo-sport=padel]{animation-name:padelServe}.court-ball.demo-rally[data-demo-sport=padel]{animation-name:padelRally}.court-ball.demo-serve[data-demo-sport=tennis]{animation-name:tennisServe}.court-ball.demo-rally[data-demo-sport=tennis]{animation-name:tennisRally}.court-ball.demo-serve[data-demo-sport=squash]{animation-name:squashServe}.court-ball.demo-rally[data-demo-sport=squash]{animation-name:squashRally}.court-ball.demo-serve[data-demo-sport=pickleball]{animation-name:pickleServe}.court-ball.demo-rally[data-demo-sport=pickleball]{animation-name:pickleRally}.court-ball.demo-serve[data-demo-sport=badminton]{animation-name:badmintonServe}.court-ball.demo-rally[data-demo-sport=badminton]{animation-name:badmintonRally}.court-ball.demo-serve:after,.court-ball.demo-rally:after{content:"";border:2px solid #f5ee6157;border-radius:50%;animation:.55s ease-in-out infinite alternate pulseBall;position:absolute;inset:-7px}.demo-markers{z-index:6;pointer-events:none;position:absolute;inset:0}.demo-marker{opacity:0;align-items:center;gap:4px;transition:opacity .2s,transform .2s;display:flex;position:absolute;transform:translate(-50%,-50%)scale(.76)}.demo-marker.edge-right{flex-direction:row-reverse}.demo-marker b{color:#fff;background:#0d231fe6;border:2px solid #fff;border-radius:50%;place-items:center;width:22px;height:22px;font:800 9px/1 DM Sans;display:grid;box-shadow:0 2px 7px #00000047}.demo-marker span{color:#fff;white-space:nowrap;background:#0d231fe6;border-radius:6px;padding:4px 6px;font:800 8px/1 DM Sans;box-shadow:0 2px 7px #00000038}.demo-marker.p1 span{transform:translateY(-14px)}.demo-marker.p2 span{transform:translateY(14px)}.court.animating .demo-marker.done{opacity:.56;transform:translate(-50%,-50%)scale(.9)}.court.animating .demo-marker.active{opacity:1;transform:translate(-50%,-50%)scale(1.05)}.court-zone.serve-target{outline-offset:-1px;background:#dafa6833;outline:1px dashed #dafa68a6}.court-line.net:after{content:"NET";color:#ffffffc7;transform-origin:0 0;font:800 7px/1 DM Sans;position:absolute;top:48%;left:7px;transform:rotate(90deg)}.animation-key{color:#ffffffc7;flex-wrap:wrap;gap:12px;width:min(100%,570px);margin:9px auto 0;font-size:9px;font-weight:700;display:flex}.animation-key span{align-items:center;gap:5px;display:flex}.animation-key i{border:2px solid #fff;border-radius:50%;width:9px;height:9px;display:inline-block}.animation-key i.ball-key{background:#f5ee61;border:0}.rule-alert{background:var(--amber-bg);color:var(--amber);border-radius:11px;margin-top:10px;padding:11px 12px;font-size:12px;font-weight:800;line-height:1.45}.rule-caption button[disabled]{opacity:.64;cursor:wait}.rule-caption button.played{background:var(--lime);color:#17200e}.court-specs{flex-wrap:wrap;gap:6px;width:min(100%,570px);margin:10px auto 0;display:flex}.court-spec{color:#ffffffd6;border:1px solid #ffffff3d;border-radius:999px;padding:5px 8px;font-size:9px;font-weight:700}.court-spec b{color:#fff}.rule-basis a{color:var(--accent);text-underline-offset:2px;font-weight:800}.rule-caveat{color:var(--muted);margin:10px 0 0;font-size:10px;line-height:1.45}@keyframes ruleRally{0%{bottom:25%;left:20%;transform:scale(.8)}38%{bottom:68%;left:47%;transform:scale(1.15)}72%{bottom:35%;left:78%;transform:scale(.9)}to{bottom:74%;left:88%;transform:scale(.72)}}@keyframes padelServe{0%{top:59%;left:11%}14%{top:69%;left:11%;transform:scale(.72)}20%{top:80%;left:10%;transform:scale(1.08)}42%{top:48%;left:49%;transform:scale(1)}65%{top:25%;left:67%;transform:scale(.72)}69%{top:25%;left:67%;transform:scale(1.05)}to{top:18%;left:73%;transform:scale(.88)}}@keyframes padelRally{0%{top:24%;left:78%}18%{top:30%;left:62%}34%{top:71%;left:32%}38%{top:72%;left:30%;transform:scale(.75)}42%{top:72%;left:30%;transform:scale(1)}61%{top:63%;left:7%}66%{top:63%;left:5%;transform:scale(.78)}82%{top:43%;left:50%;transform:scale(1)}to{top:69%;left:76%;transform:scale(.76)}}@keyframes tennisServe{0%{top:72%;left:5%}15%{top:54%;left:7%;transform:scale(1.12)}43%{top:46%;left:50%;transform:scale(1)}67%{top:26%;left:69%;transform:scale(.7)}72%{top:26%;left:69%;transform:scale(1.05)}to{top:16%;left:88%;transform:scale(.86)}}@keyframes tennisRally{0%{top:22%;left:84%}22%{top:31%;left:63%}38%{top:71%;left:25%;transform:scale(.72)}43%{top:71%;left:25%;transform:scale(1)}64%{top:46%;left:50%}84%{top:31%;left:76%;transform:scale(.72)}to{top:23%;left:88%;transform:scale(.9)}}@keyframes squashServe{0%{top:19%;left:64%}34%{top:34%;left:3%;transform:scale(1.05)}63%{top:73%;left:79%;transform:scale(.7)}68%{top:73%;left:79%;transform:scale(1)}to{top:55%;left:65%;transform:scale(.86)}}@keyframes squashRally{0%{top:70%;left:76%}25%{top:61%;left:3%}47%{top:28%;left:44%;transform:scale(.72)}52%{top:28%;left:44%;transform:scale(1)}76%{top:24%;left:3%}to{top:62%;left:70%;transform:scale(.75)}}@keyframes pickleServe{0%{top:72%;left:5%}18%{top:64%;left:12%;transform:scale(1.05)}47%{top:48%;left:50%}70%{top:25%;left:78%;transform:scale(.7)}75%{top:25%;left:78%;transform:scale(1)}to{top:18%;left:88%;transform:scale(.84)}}@keyframes pickleRally{0%{top:25%;left:78%}19%{top:31%;left:70%}39%{top:72%;left:28%;transform:scale(.72)}44%{top:72%;left:28%;transform:scale(1)}65%{top:48%;left:48%}82%{top:34%;left:66%}to{top:62%;left:82%;transform:scale(.78)}}@keyframes badmintonServe{0%{top:71%;left:10%}20%{top:39%;left:29%;transform:scale(1.14)}48%{top:17%;left:50%;transform:scale(1.24)}73%{top:26%;left:75%;transform:scale(.78)}78%{top:26%;left:75%;transform:scale(1)}to{top:17%;left:87%;transform:scale(.84)}}@keyframes badmintonRally{0%{top:25%;left:78%}23%{top:12%;left:52%;transform:scale(1.28)}46%{top:69%;left:24%;transform:scale(.75)}51%{top:69%;left:24%;transform:scale(1)}74%{top:10%;left:51%;transform:scale(1.3)}to{top:64%;left:82%;transform:scale(.74)}}@media (max-width:900px){.rule-stage{grid-template-columns:1fr}.sport-switch{max-width:none}}@media (max-width:680px){.rule-studio{border-radius:20px;padding:16px}.rule-studio-head{flex-direction:column;align-items:flex-start}.sport-switch{grid-template-columns:repeat(2,1fr);width:100%;display:grid}.court-demo{min-height:280px;padding:14px}}@media (prefers-reduced-motion:reduce){.court-ball.demo-serve,.court-ball.demo-rally{animation-duration:.01ms!important}.court-ball.demo-serve:after,.court-ball.demo-rally:after{animation:none!important}}