:root{font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;color:#102027;background:#f7faf8;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased}*{box-sizing:border-box}body{margin:0;min-width:320px;min-height:100vh;background:linear-gradient(135deg,rgba(76,175,164,.16),transparent 32%),linear-gradient(225deg,rgba(255,193,7,.14),transparent 28%),#f7faf8}button,input{font:inherit}button{cursor:pointer}.app-shell{width:min(100%,440px);min-height:100vh;margin:0 auto;padding:max(18px,env(safe-area-inset-top)) 16px max(20px,env(safe-area-inset-bottom))}.home-shell{display:grid;place-items:center}.home-panel{width:100%}.brand-row{display:grid;justify-items:center;gap:6px;margin-bottom:28px;text-align:center}h1{margin:0;font-size:42px;line-height:1;letter-spacing:0}p{margin:6px 0 0;color:#58706d}.difficulty-list{display:grid;gap:10px;margin-bottom:22px}.difficulty{display:flex;justify-content:space-between;align-items:center;width:100%;min-height:54px;padding:0 16px;border:1px solid #d6e4df;border-radius:8px;background:#fff;color:#102027;font-weight:800}.difficulty span{font-size:13px;font-weight:700;color:#607d77}.difficulty.active{border-color:#0f766e;box-shadow:inset 0 0 0 1px #0f766e}.difficulty.locked{color:#8ba09c;background:#eef5f2}.primary-action,.secondary-action,.text-action{width:100%;min-height:50px;border-radius:8px;border:0;font-weight:900}.primary-action{background:#0f766e;color:#fff}.secondary-action{border:1px solid #cfe0da;background:#fff;color:#102027}.text-action{margin-top:10px;background:transparent;color:#607d77}.home-actions{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}.home-actions .text-action{margin-top:0;border:1px solid #d6e4df;background:#fff}.game-shell{display:flex;flex-direction:column;gap:14px}.game-header{display:grid;grid-template-columns:42px minmax(0,1fr) auto;gap:10px;align-items:center}.header-tools{display:inline-flex;align-items:center;gap:6px}.icon-button{width:42px;height:42px;border-radius:8px;border:1px solid #d6e4df;background:#fff;color:#102027;font-size:28px;line-height:1}.icon-button.small-text{font-size:18px;font-weight:900}.level-title{font-size:18px;line-height:1.2;font-weight:900}.level-meta{margin-top:3px;color:#607d77;font-size:12px;font-weight:700}.audio-toggle{display:inline-flex;align-items:center;gap:5px;min-height:36px;padding:0 8px;border-radius:8px;border:1px solid #d6e4df;background:#fff;color:#102027;font-size:12px;font-weight:900}.score-strip{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}.score-strip div{min-height:46px;padding:8px;border-radius:8px;background:#fff;border:1px solid #d6e4df;color:#607d77;font-size:12px;font-weight:800;text-align:center}.score-strip strong{display:block;color:#102027;font-size:18px;line-height:1.1}.combo-message{min-height:24px;color:#b45309;text-align:center;font-size:20px;font-weight:950}.board{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:8px;width:100%;aspect-ratio:1}.card{position:relative;display:grid;place-items:center;min-width:0;min-height:0;padding:7px;border-radius:8px;border:1px solid #cfe0da;background:#fff;color:#102027;box-shadow:0 6px 18px #10202714;overflow:hidden;touch-action:manipulation;transition:transform .15s ease,border-color .15s ease,background .15s ease,box-shadow .15s ease,filter .15s ease}.card:after{content:"";position:absolute;inset:9px;border-radius:7px;background:#ffffff75;opacity:0;transform:scale(.72);transition:opacity .18s ease,transform .18s ease;pointer-events:none}.card:active{transform:scale(.96);filter:brightness(1.04);box-shadow:0 3px 10px #1020271f}.card:active:after{opacity:1;transform:scale(1)}.card span{display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;max-width:100%;font-size:clamp(12px,calc(28px - var(--letters) * .9px),24px);line-height:1.08;font-weight:950;overflow-wrap:anywhere;text-align:center}.card.en{background:#f0fdfa;padding:3px}.card.en span{display:block;white-space:nowrap;text-wrap:nowrap;overflow-wrap:normal;word-break:normal;text-overflow:clip;font-size:clamp(9px,calc(23px - var(--letters) * 1.15px),22px)}.card.zh{background:#fff7ed}.card.selected{border-color:#0f766e;background:#ccfbf1;transform:translateY(-2px);box-shadow:0 10px 22px #0f766e2e;animation:selected-breathe .62s ease}.card.mismatch{border-color:#dc2626;background:#fee2e2;color:#7f1d1d;animation:mismatch-shake .18s ease}.card.empty{border-style:dashed;background:#ffffff59;box-shadow:none}.game-actions{margin-top:auto}.dialog-backdrop{position:fixed;inset:0;z-index:20;display:grid;place-items:center;padding:18px;background:#10202775}.result-backdrop{place-items:center;overflow:hidden;background:radial-gradient(circle at 50% 38%,rgba(255,214,102,.28),transparent 34%),#1020278a}.victory-effects{position:absolute;inset:0;pointer-events:none}.victory-rays{position:absolute;left:50%;top:50%;width:118vmax;height:118vmax;background:conic-gradient(from 0deg,rgba(255,216,77,.32),transparent 9deg,rgba(45,212,191,.2) 18deg,transparent 31deg);opacity:0;transform:translate(-50%,-50%) scale(.35) rotate(0);animation:victory-rays .98s ease-out forwards}.confetti,.spark{position:absolute;left:50%;top:50%;opacity:0}.confetti{width:12px;height:24px;border-radius:3px;background:#f59e0b;animation:confetti-burst .98s cubic-bezier(.17,.84,.44,1) forwards}.confetti-a{--tx: -148px;--ty: -214px;--rot: -48deg;background:#f97316}.confetti-b{--tx: 136px;--ty: -202px;--rot: 52deg;background:#14b8a6}.confetti-c{--tx: -178px;--ty: 178px;--rot: 34deg;background:#e11d48}.confetti-d{--tx: 168px;--ty: 162px;--rot: -28deg;background:#2563eb}.spark{width:10px;height:10px;border-radius:50%;background:#fde68a;box-shadow:0 0 20px #fde68adb;animation:spark-pop .85s ease-out forwards}.spark-a{--tx: -96px;--ty: -126px}.spark-b{--tx: 118px;--ty: -96px;animation-delay:.1s}.spark-c{--tx: 22px;--ty: 152px;animation-delay:.16s}.result-dialog{position:relative;z-index:1;width:min(100%,410px);max-height:calc(100vh - 36px);overflow:auto;padding:18px;border-radius:8px;background:#fff}.result-dialog.victory-dialog{width:min(100%,430px);padding:20px 18px 18px;border:1px solid rgba(255,216,77,.72);box-shadow:0 26px 70px #10202757,0 0 0 1px #ffffff94 inset;animation:victory-pop .52s cubic-bezier(.2,1.08,.34,1) both}.victory-badge{display:grid;place-items:center;width:52px;height:52px;margin:0 auto 8px;border-radius:50%;background:linear-gradient(145deg,#fff7cc,#f59e0b 68%,#e11d48);color:#fff;font-size:27px;line-height:1;text-shadow:0 2px 8px rgba(120,53,15,.28);box-shadow:0 12px 26px #f59e0b57;animation:badge-glow .95s ease-out both}.result-dialog h2{margin:0 0 14px;font-size:28px}.victory-dialog h2{margin-bottom:18px;color:#102027;text-align:center;font-size:36px}.result-dialog dl{display:grid;grid-template-columns:repeat(2,1fr);gap:10px;margin:0 0 16px}.result-dialog dl div{padding:12px;border-radius:8px;background:#f4faf7}.result-dialog dt{color:#607d77;font-size:12px;font-weight:800}.result-dialog dd{margin:3px 0 0;font-size:20px;font-weight:950}.compact-dialog{display:grid;gap:10px}.wrong-words{display:grid;gap:4px;margin-bottom:14px;padding:12px;border-radius:8px;background:#fff7ed}.wrong-words span,.storage-note{color:#607d77;font-size:12px;font-weight:800}.wrong-words strong{font-size:14px;line-height:1.35}@keyframes victory-pop{0%{opacity:0;transform:translateY(18px) scale(.88)}68%{opacity:1;transform:translateY(-4px) scale(1.025)}to{opacity:1;transform:translateY(0) scale(1)}}@keyframes victory-rays{0%{opacity:0;transform:translate(-50%,-50%) scale(.35) rotate(0)}24%{opacity:.9}to{opacity:0;transform:translate(-50%,-50%) scale(1.1) rotate(42deg)}}@keyframes confetti-burst{0%{opacity:0;transform:translate(-50%,-50%) scale(.35) rotate(0)}18%{opacity:1}to{opacity:0;transform:translate(calc(-50% + var(--tx)),calc(-50% + var(--ty))) scale(1) rotate(var(--rot))}}@keyframes spark-pop{0%{opacity:0;transform:translate(-50%,-50%) scale(.4)}32%{opacity:1}to{opacity:0;transform:translate(calc(-50% + var(--tx)),calc(-50% + var(--ty))) scale(1.6)}}@keyframes badge-glow{0%{transform:scale(.72) rotate(-18deg);filter:brightness(1.3)}56%{transform:scale(1.12) rotate(6deg);filter:brightness(1.14)}to{transform:scale(1) rotate(0);filter:brightness(1)}}.setting-row{display:flex;align-items:center;justify-content:space-between;min-height:50px;padding:0 12px;border:1px solid #d6e4df;border-radius:8px;background:#f7faf8;font-weight:900}.danger-action{color:#991b1b}.level-shell,.word-book-shell{display:flex;flex-direction:column;gap:14px}.level-select,.word-book-list{display:grid;gap:8px;overflow:auto;padding-bottom:8px}.level-card{display:grid;gap:4px;min-height:58px;padding:10px 12px;border:1px solid #d6e4df;border-radius:8px;background:#fff;color:#102027;text-align:left}.level-card span{font-size:15px;line-height:1.2;font-weight:900}.level-card small{color:#607d77;font-size:12px;font-weight:800}.level-card.locked{background:#eef5f2;color:#8ba09c}.word-book-item{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:10px;align-items:center;min-height:64px;padding:10px 12px;border:1px solid #d6e4df;border-radius:8px;background:#fff}.word-book-word{display:grid;gap:3px;min-width:0;padding:0;border:0;background:transparent;color:#102027;text-align:left}.word-book-word strong{overflow:hidden;font-size:17px;line-height:1.15;font-weight:950;text-overflow:ellipsis;white-space:nowrap}.word-book-word span,.word-book-meta span{color:#607d77;font-size:12px;font-weight:800}.word-book-meta{display:grid;justify-items:end;gap:2px;text-align:right}.word-book-meta strong{color:#b45309;font-size:18px;line-height:1;font-weight:950}.word-book-empty{display:grid;place-items:center;min-height:160px;border:1px dashed #cfe0da;border-radius:8px;background:#ffffff80;color:#607d77;font-weight:900}@keyframes mismatch-shake{0%{transform:translate(0)}35%{transform:translate(-2px)}70%{transform:translate(2px)}to{transform:translate(0)}}@keyframes selected-breathe{0%{transform:translateY(0) scale(1)}45%{transform:translateY(-2px) scale(1.035)}to{transform:translateY(-2px) scale(1)}}@media(max-width:360px){.app-shell{padding-left:10px;padding-right:10px}.board{gap:4px}}