:root{--bg: #FFF6EC;--bg2: #FFEDD8;--paper: #FFFFFF;--ink: #2A2440;--ink2: #6B6480;--muted: #B5AFC0;--line: #ECE6D8;--coral: #FF6B6B;--coral-d: #E85555;--orange: #FF9F43;--mint: #2EC4B6;--yellow: #FFD43B;--purple: #8B5CF6;--pink: #FF7AA8;--green: #34C759;--red: #FF4D4F;--radius: 18px;--radius-lg: 24px;--shadow-hard: 4px 4px 0 var(--ink);--shadow-soft: 0 6px 20px rgba(42, 36, 64, .08);--tabbar-h: 64px;font-size:16px}*{box-sizing:border-box}html,body{-webkit-tap-highlight-color:transparent;-webkit-text-size-adjust:100%}body{margin:0;font-family:-apple-system,PingFang SC,Helvetica Neue,Microsoft YaHei,sans-serif;background:var(--bg);color:var(--ink);line-height:1.6;-webkit-font-smoothing:antialiased;overscroll-behavior-y:none}button,.opt,select,input{touch-action:manipulation;font-family:inherit}a{color:var(--coral);text-decoration:none;font-weight:700}.muted{color:var(--ink2);font-size:.85rem}.app-shell{max-width:720px;margin:0 auto;min-height:100vh;padding:0 18px calc(var(--tabbar-h) + 24px + env(safe-area-inset-bottom));padding-top:env(safe-area-inset-top)}.quiz-full{max-width:760px;margin:0 auto;min-height:100vh;padding:0 18px calc(24px + env(safe-area-inset-bottom));padding-top:env(safe-area-inset-top)}.loading{min-height:100vh;display:grid;place-items:center;color:var(--ink2)}.tabbar{position:fixed;left:0;right:0;bottom:0;background:var(--paper);border-top:3px solid var(--ink);box-shadow:0 -4px 0 var(--ink);padding-bottom:env(safe-area-inset-bottom);z-index:50}.tabbar-inner{max-width:720px;margin:0 auto;display:grid;grid-template-columns:repeat(3,1fr);height:var(--tabbar-h)}.tab{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;color:var(--muted);text-decoration:none;position:relative;transition:color .15s}.tab .tab-emoji{font-size:1.35rem;line-height:1}.tab 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var(--ink);border-radius:12px;background:var(--paper);color:var(--ink);min-width:0}.study-search:focus{outline:none;box-shadow:2px 2px 0 var(--ink)}.cat-picker{position:relative;flex:1 1 auto;min-width:0}.cat-trigger{width:100%;display:flex;align-items:center;justify-content:space-between;gap:8px;padding:11px 12px;font-size:16px;font-weight:700;border:2.5px solid var(--ink);border-radius:12px;background:var(--bg2);color:var(--ink);cursor:pointer;box-shadow:2px 2px 0 var(--ink);font-family:inherit}.cat-trigger .cat-label{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.cat-trigger .cat-caret{font-size:.75em;opacity:.7;flex-shrink:0}.cat-popover{position:absolute;top:calc(100% + 6px);left:0;right:0;z-index:60;background:var(--paper);border:3px solid var(--ink);border-radius:14px;box-shadow:var(--shadow-hard);padding:10px;max-height:min(60vh,420px);display:flex;flex-direction:column}.cat-search{padding:10px 12px;font-size:16px;border:2.5px solid var(--ink);border-radius:10px;background:var(--bg);margin-bottom:8px;font-family:inherit}.cat-search:focus{outline:none;box-shadow:2px 2px 0 var(--ink)}.cat-list{overflow-y:auto;flex:1;display:flex;flex-direction:column;gap:2px;-webkit-overflow-scrolling:touch}.cat-opt{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:12px;font-size:16px;border:none;background:none;border-radius:10px;cursor:pointer;color:var(--ink);font-family:inherit;font-weight:600}.cat-opt-name{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.cat-prog{display:inline-flex;align-items:center;gap:8px;flex-shrink:0}.cat-prog-num{font-size:.72rem;font-weight:700;color:var(--mint);white-space:nowrap}.cat-prog-bar{width:52px;height:7px;background:var(--bg2);border-radius:999px;overflow:hidden}.cat-prog-bar i{display:block;height:100%;background:var(--mint);border-radius:999px}.cat-opt.on{background:var(--yellow);font-weight:800}.cat-opt.on .cat-prog-num{color:var(--ink)}.cat-opt:hover:not(.on){background:var(--bg2)}.cat-empty{padding:16px;text-align:center;color:var(--muted);font-size:.85rem}.idiom-list{position:relative;margin-bottom:8px}.idiom-card{background:var(--paper);border:2.5px solid var(--ink);border-radius:14px;padding:13px 15px;box-shadow:3px 3px 0 var(--ink)}.idiom-row{display:flex;align-items:center;gap:10px}.idiom-word{font-size:1.18rem;font-weight:800;color:var(--coral)}.idiom-tag{font-size:.7rem;font-weight:700;color:var(--ink2);background:var(--bg2);padding:3px 9px;border-radius:999px}.fav-btn{margin-left:auto;background:none;border:none;font-size:1.3rem;cursor:pointer;color:var(--muted);line-height:1;padding:2px 4px}.fav-btn.on{color:var(--yellow);-webkit-text-stroke:1px var(--ink)}.idiom-meaning{margin:8px 0 6px;font-size:.9rem;color:var(--ink);line-height:1.6}.idiom-examples{margin:8px 0 0;padding-top:8px;border-top:2px dashed var(--line)}.idiom-examples p{margin:4px 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var(--ink)}.group-card.done{background:var(--bg2)}.group-card-name{font-size:1rem;font-weight:800;color:var(--ink);line-height:1.25;word-break:break-word}.group-card-prog{display:flex;align-items:center;gap:8px}.group-card-num{font-size:.76rem;font-weight:700;color:var(--ink2);white-space:nowrap}.group-card-done{font-size:.78rem;font-weight:800;color:var(--green)}.mini-bar{flex:1;height:7px;border-radius:999px;background:var(--bg2);overflow:hidden}.mini-bar i{display:block;height:100%;background:var(--coral);border-radius:999px}.group-head{display:flex;align-items:baseline;justify-content:space-between;margin:4px 2px 10px}.group-head-name{font-size:1.05rem;font-weight:800;color:var(--ink)}.group-head-prog{font-size:.8rem;font-weight:700;color:var(--ink2)}.study-badge{margin-left:auto;flex-shrink:0;font-size:.68rem;font-weight:800;color:var(--muted);background:var(--bg2);padding:3px 9px;border-radius:999px;white-space:nowrap}.study-badge.on{color:#fff;background:var(--mint)}.idiom-row-link{cursor:pointer;transition:transform .1s,box-shadow .1s}.idiom-row-link:hover{transform:translate(-1px,-1px);box-shadow:4px 4px 0 var(--ink)}.idiom-row-link:active{transform:translate(2px,2px);box-shadow:1px 1px 0 var(--ink)}.idiom-row-link:focus-visible{outline:3px solid var(--coral);outline-offset:2px}.idiom-row-link.flash{animation:row-flash 1.8s ease-out}@keyframes row-flash{0%{box-shadow:var(--shadow-hard),inset 0 0 0 100px var(--yellow)}to{box-shadow:var(--shadow-hard),inset 0 0 0 100px transparent}}.empty-state{text-align:center;color:var(--muted);padding:48px 20px;font-size:.95rem}.empty-state .e{font-size:2.6rem;display:block;margin-bottom:8px}.detail-head{display:flex;align-items:center;gap:12px;padding:16px 2px 8px}.detail-card{padding:22px 20px 24px}.detail-word-row{display:flex;align-items:center;justify-content:space-between;gap:12px}.detail-word{margin:0;font-size:2rem;font-weight:900;letter-spacing:2px;color:var(--coral)}.detail-word-row .fav-btn{font-size:1.6rem;margin-left:0}.detail-tags{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin:14px 0 4px}.detail-tags .study-badge{margin-left:0}.detail-sec{margin-top:18px;padding-top:16px;border-top:2px dashed var(--line)}.detail-sec-h{margin:0 0 8px;font-size:.82rem;font-weight:800;color:var(--ink2);letter-spacing:1px}.detail-meaning{margin:0;font-size:1rem;line-height:1.85;color:var(--ink);white-space:pre-wrap}.detail-card .idiom-examples{margin-top:0;padding-top:0;border-top:none}.wb-summary{background:var(--paper);border:3px solid var(--ink);border-radius:var(--radius);padding:16px 18px;margin-bottom:14px;font-size:.92rem;font-weight:600;box-shadow:var(--shadow-soft)}.wb-summary b{color:var(--coral);font-size:1.5rem;font-weight:800;margin-right:6px}.wb-modes{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-bottom:16px;font-size:.82rem;color:var(--ink2);font-weight:600}.wb-modes .btn-ghost{padding:9px 14px;font-size:.85rem;box-shadow:2px 2px 0 var(--ink)}.wb-list{display:grid;gap:9px}.wb-card{border-left:8px solid var(--coral)}.wb-count{flex-shrink:0;font-size:.72rem;font-weight:800;color:#fff;background:var(--coral);padding:3px 9px;border-radius:999px;border:2px solid var(--ink)}.wb-noex{color:var(--muted);font-style:italic}.wb-category{margin-bottom:22px}.wb-cat-icon{margin-right:6px}.wb-mode{margin-top:10px}.wb-mode-head{display:flex;align-items:center;justify-content:space-between;gap:8px;margin-bottom:4px}.wb-mode-title{font-size:.98rem;font-weight:800;color:var(--ink);margin:0}.wb-mode-count{color:var(--coral);font-weight:800}.wb-mode .wb-modes{margin-bottom:12px}.quizbar{display:flex;align-items:center;gap:12px;padding:18px 0 14px}.icon-btn{width:42px;height:42px;border-radius:12px;border:2.5px solid var(--ink);background:var(--paper);font-size:1.5rem;line-height:1;cursor:pointer;color:var(--ink);box-shadow:2px 2px 0 var(--ink);flex-shrink:0}.icon-btn:active{transform:translate(2px,2px);box-shadow:0 0 0 var(--ink)}.progress{flex:1}.prog-text{font-size:.74rem;color:var(--ink2);font-weight:700}.bar{margin-top:6px;height:12px;background:var(--bg2);border-radius:999px;border:2px solid var(--ink);overflow:hidden}.bar-fill{height:100%;width:0%;background:linear-gradient(90deg,var(--mint),var(--coral));transition:width .35s cubic-bezier(.4,1.4,.6,1)}.streak-pill{display:flex;align-items:center;gap:4px;background:var(--yellow);border:2.5px solid var(--ink);border-radius:999px;padding:5px 12px 5px 8px;font-size:.9rem;font-weight:800;color:var(--ink);box-shadow:2px 2px 0 var(--ink)}.qbox{background:var(--paper);border:3px solid var(--ink);border-radius:var(--radius-lg);padding:26px 22px 22px;box-shadow:var(--shadow-hard);margin-bottom:18px}.quiz-actions{margin-top:20px}.quiz-nav{display:flex;gap:10px;align-items:stretch}.qmeta{display:inline-block;font-size:.72rem;font-weight:800;color:var(--coral);background:#ffe8e8;padding:4px 12px;border-radius:999px;margin-bottom:16px;letter-spacing:.5px}.qprompt{font-size:1.06rem;line-height:1.95;margin-bottom:22px;white-space:pre-wrap;font-weight:500}.qprompt .blank{display:inline-block;min-width:120px;background:var(--yellow);border-bottom:3px solid var(--ink);margin:0 3px;text-align:center;color:var(--ink);font-weight:700;border-radius:6px 6px 0 0}.qprompt .idiom-hi{background:#fff3d6;color:var(--ink);font-weight:700;padding:0 4px;border-radius:4px}.options{display:grid;gap:11px}.opt{display:flex;gap:12px;align-items:center;text-align:left;background:var(--paper);border:2.5px solid var(--ink);border-radius:14px;padding:15px 16px;cursor:pointer;font-size:1rem;color:var(--ink);transition:transform .1s,box-shadow .1s;box-shadow:3px 3px 0 var(--ink);line-height:1.5;font-family:inherit}.opt:hover:not(.disabled){background:#fff9f0}.opt:active:not(.disabled){transform:translate(2px,2px);box-shadow:1px 1px 0 var(--ink)}.opt.disabled{cursor:default}.opt .key{flex-shrink:0;width:32px;height:32px;display:grid;place-items:center;background:var(--bg2);border:2px solid var(--ink);border-radius:10px;font-weight:800;font-size:.9rem}.opt.correct{background:#dffbe5;border-color:var(--green)}.opt.correct .key{background:var(--green);color:#fff;border-color:var(--green)}.opt.wrong{background:#ffe0e0;border-color:var(--red)}.opt.wrong .key{background:var(--red);color:#fff;border-color:var(--red)}.opt.dimmed{opacity:.45}.feedback{margin-top:20px;border-top:2px dashed var(--line);padding-top:18px;animation:pop .3s cubic-bezier(.4,1.6,.6,1)}@keyframes pop{0%{transform:scale(.96);opacity:0}to{transform:scale(1);opacity:1}}.verdict{font-weight:800;font-size:1.1rem;margin-bottom:10px}.verdict.right{color:var(--green)}.verdict.wrong{color:var(--red)}.explanation{background:var(--bg2);border-radius:12px;padding:14px 16px;font-size:.9rem;color:var(--ink);line-height:1.75;white-space:pre-wrap;border-left:4px solid var(--coral)}.explanation-figure{width:100%;max-height:360px;object-fit:contain;display:block;box-sizing:border-box;margin-top:12px;border:1px solid var(--line, #eee);border-radius:8px;background:#fff}.note-toggle{display:block;margin-top:10px;padding:4px 10px;background:none;border:none;color:var(--ink2, #777);font-size:.82rem;cursor:pointer;text-align:left;max-width:100%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.note-box{margin-top:10px;padding:0 10px 10px;display:flex;flex-direction:column;gap:6px}.note-input{width:100%;box-sizing:border-box;border:1px solid var(--line, #eee);border-radius:10px;padding:10px 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