/* A direct, child-readable path: level → lesson → read and play. */
.level-shortcuts{grid-template-columns:repeat(6,minmax(0,1fr))}
#world{max-width:1140px;margin:22px auto;padding:0 20px 40px}
.sets-heading{display:flex;align-items:center;gap:22px;margin:24px 0;color:#fff5d3;text-shadow:0 2px 4px #063b44}
.sets-heading>div{flex:1}.sets-heading h1{font-size:clamp(26px,4vw,38px);margin:8px 0}.sets-heading h1 small{display:block;font-size:18px;margin-top:6px}.sets-heading p{line-height:1.65;margin:8px 0}.sets-heading p small{font-size:16px}.sets-heading #seal-counter{background:#06424fe8;border:1px solid #e3be71;border-radius:20px;padding:12px;white-space:nowrap;font-size:16px}
.study-set-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}
.study-set-row{display:grid;grid-template-columns:46px minmax(0,1fr);gap:12px 16px;text-decoration:none;color:#fff5d5;padding:22px;background:linear-gradient(145deg,#0e5c68f7,#083c4afc);border:2px solid #e0bd75;border-radius:20px;box-shadow:0 5px 0 #765b32,0 12px 24px #002c364d;transition:transform .16s,border-color .16s}
.study-set-row:hover{transform:translateY(-3px);border-color:#fff1bd}.study-set-row:focus-visible{outline:4px solid #fff4b6;outline-offset:4px}.set-number{display:grid;place-items:center;align-self:start;width:46px;height:46px;border-radius:14px;background:#edc979;color:#18434a;font-size:22px;font-weight:900;box-shadow:0 3px 0 #9b7734}.set-details>small{font-size:16px;color:#d9ebe6}.set-details h2{font-size:30px;line-height:1.15;margin:5px 0 12px;color:#ffe4a3}.set-details p{font-size:14px;margin:0 0 8px;color:#c3dedb}.set-words{font-size:15px;line-height:1.5;color:#fff4d4;display:block;min-height:44px}.set-progress{display:flex;gap:5px;flex-wrap:wrap;margin-top:15px}.set-progress>span{padding:5px 7px;border:1px solid #50929a;border-radius:7px;font-size:14px;background:#063441}.set-progress .done{background:#e9c673;color:#193d42;border-color:#ffe7a6}.set-art{grid-column:1/-1;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px}.set-art img{width:100%;height:auto;aspect-ratio:1.25;object-fit:contain;background:#edf5ed;border-radius:12px;border:1px solid #d8c58e}.set-open{grid-column:1/-1;display:flex;align-items:center;gap:12px;font-weight:800;font-size:17px;border-top:1px solid #8dbeb966;padding-top:12px}.set-open b{margin-left:auto;font-size:24px}.set-open small{font-size:14px;font-weight:400;order:1}
.study-app .study-shell{max-width:1120px}.study-top{padding:0 0 18px}.study-top .icon-button{font-size:16px!important;line-height:1.5;min-height:44px}.set-intro{padding:20px 0 22px}.set-intro h1{font:800 clamp(24px,4vw,34px)/1.3 'Trebuchet MS',Arial,sans-serif;margin:7px 0;color:#ffe7aa}.set-intro>p{font-size:16px;line-height:1.6;margin:6px 0 16px;color:#e0eee5}.set-intro>p small{display:inline-block;font-size:15px}.set-stages{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px}.set-stage{position:relative;display:flex;gap:10px;align-items:center;overflow:hidden;border:2px solid #66999f;border-radius:14px;background:#094454;color:#fff6db;min-height:96px;padding:12px;text-decoration:none}.set-stage>img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:.24}.set-stage>span{position:relative;z-index:1}.set-stage .stage-number{background:#0b3c49;border:1px solid #f0d08d;border-radius:50%;min-width:32px;height:32px;display:grid;place-items:center;font-size:19px;font-weight:800}.set-stage b{font-size:16px;line-height:1.25;display:block}.set-stage small{display:block;font-size:14px;margin-top:6px;color:#dfede5}.set-stage.active{border-color:#ffdd8a;box-shadow:0 4px 0 #a07e3c;background:#16565c}.set-stage.active .stage-number{background:#f4d283;color:#12444a}.set-stage:focus-visible{outline:3px solid #ffe7a6;outline-offset:4px}.set-stage:hover{border-color:#ffe3a0}
.study-toolbar{align-items:flex-start}.mode-buttons{flex-shrink:0}.mode-buttons button{font-size:16px;min-height:48px}.study-toolbar h2{font:800 25px/1.3 'Trebuchet MS',Arial,sans-serif}.study-grid{align-items:start}.study-card{min-width:0}.study-card .note-number{font-size:14px;letter-spacing:.05em}.study-grid .vocabulary-art{aspect-ratio:1.25}.study-grid .illustrated-title{font-size:26px}.study-grid .vocabulary-translation{font-size:18px}.study-grid .word-readings .listen-all{font-size:16px;padding:10px}.study-grid .mark-read{font-size:16px}.study-card .example-label{font-size:13px;letter-spacing:0}.study-grid .vocabulary-definition{font-size:16px}.study-grid .example-en{font-size:16px}.study-grid .example-zh{font-size:15px}.study-grid .vocabulary-example{padding:12px}.study-grid .card-audio-status:empty{display:none}.reading-guide{font-size:16px}.study-grid .verb-forms{grid-template-columns:1fr}.study-grid .verb-form{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:6px}.study-grid .verb-form>span{grid-column:1/-1;text-align:left;min-height:0;font-size:14px}.study-grid .verb-form strong{margin:0;font-size:24px;text-align:left}.study-grid .verb-form .form-listen{grid-column:2;font-size:14px;margin:0}.study-grid .verb-card-title{font-size:21px}.study-audio-note{line-height:1.6}
@media(max-width:760px){#world{padding:0 12px 24px}.sets-heading{flex-wrap:wrap;gap:12px}.sets-heading>button{order:0}.sets-heading #seal-counter{order:1;margin-left:auto}.sets-heading>div{order:2;flex-basis:100%}.study-set-list{grid-template-columns:1fr}.study-set-row{grid-template-columns:42px minmax(0,1fr) 110px;padding:18px;gap:12px}.set-art{grid-column:3;grid-row:1;align-self:center;display:block}.set-art img{aspect-ratio:1}.set-art img:not(:first-child){display:none}.set-open{grid-column:2/-1}.set-words{min-height:0}.set-stages{grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.set-stage{min-height:80px}.study-toolbar{display:block}.mode-buttons{margin-top:16px}.mode-buttons button{flex:1}.study-grid{gap:12px;grid-template-columns:repeat(2,minmax(0,1fr))}.study-grid .illustrated-word{padding:12px}.study-grid .illustrated-title{font-size:23px}.study-grid .vocabulary-example{padding:10px}.study-shell{padding:16px 12px}.study-workspace{padding:16px 12px}}
@media(max-width:480px){.study-top{align-items:flex-start}.study-brand small{font-size:12px}.study-top .icon-button{font-size:14px!important;max-width:128px;padding:8px}.study-shell{padding:14px 8px}.study-workspace{padding:14px 8px;border-width:2px;border-radius:16px}.study-grid{gap:9px}.study-grid .illustrated-word{padding:9px;border-width:2px}.study-grid .illustrated-title{font-size:21px;margin-top:12px;overflow-wrap:break-word}.study-grid .vocabulary-translation{font-size:16px}.study-grid .note-number{font-size:13px}.study-grid .word-readings{margin:10px 0}.study-grid .word-readings button{font-size:15px;padding:8px 6px}.study-grid .vocabulary-example{border-left-width:2px;padding:9px 7px}.study-grid .example-listen{font-size:14px;padding:9px 5px;width:100%}.study-grid .mark-read{font-size:14px;padding:10px 5px}.study-grid .verb-form{display:block}.study-grid .verb-form strong{margin:8px 0}.study-grid .verb-form .form-listen{width:100%}.study-grid .vocabulary-week{grid-template-columns:1fr}.study-grid .vocabulary-teaching{font-size:18px;padding:8px}.study-grid .vocabulary-hundred{gap:3px;padding:7px}.study-grid .verb-card-title{font-size:19px}.study-set-row{grid-template-columns:36px minmax(0,1fr) 85px;padding:14px;gap:10px}.set-number{width:36px;height:40px;font-size:19px}.set-details h2{font-size:27px}.set-progress{grid-column:1/-1}.set-progress>span{font-size:13px}.set-stages{gap:8px}.set-stage{padding:10px 8px;gap:8px}.set-stage b{font-size:15px}.mode-buttons{gap:6px}.mode-buttons button{font-size:15px;padding:10px 7px}.set-intro>p small{display:block}}
@media(max-width:340px){.study-grid{grid-template-columns:1fr}.set-art{display:none}.study-set-row{grid-template-columns:36px minmax(0,1fr)}}
.level-shortcuts{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:8px}.level-shortcuts button{width:auto;min-width:0;font-size:34px}.level-shortcuts button small{font-size:12px}
@media(max-width:480px){.level-shortcuts{grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}.level-shortcuts button{font-size:28px;min-height:66px}}