:root{--ink:#283e31;--muted:#758171;--green:#466a46;--pale:#eef3e6;--orange:#d58544;--border:#e3e8dc}*{box-sizing:border-box}body{margin:0;background:#f8f9f3;color:var(--ink);font-family:ui-rounded,'PingFang SC','Microsoft YaHei',system-ui,sans-serif;font-size:15px}button,a,input{-webkit-tap-highlight-color:transparent}button{font:inherit;cursor:pointer}button:focus-visible,a:focus-visible{outline:3px solid #db9e5a;outline-offset:4px}button:disabled{cursor:default}button,a{touch-action:manipulation}header{max-width:1080px;margin:auto;padding:28px 26px;display:flex;align-items:center;justify-content:space-between}.brand{text-decoration:none;color:var(--ink);font-weight:800;font-size:21px;display:flex;gap:9px;align-items:center}.brand small{font-size:9px;letter-spacing:2px;margin-left:6px;color:#87917f}.logo{background:var(--green);color:white;border-radius:13px;width:34px;height:34px;text-align:center;line-height:34px;font-size:28px}.quiet{background:none;border:0;color:var(--green);padding:9px;font-size:13px}#count{background:#e9efdf;padding:3px 8px;border-radius:20px;margin-left:5px}main{max-width:940px;margin:0 auto;padding:0 24px}.intro{display:flex;justify-content:space-between;align-items:center;padding:35px 10px 29px}.eyebrow{font-size:12px;letter-spacing:3px;color:#78906c}h1{font-weight:800;font-size:clamp(29px,5vw,43px);margin:13px 0 12px;letter-spacing:1px}.intro p{color:var(--muted);line-height:1.9;margin:0}#heroBird{width:225px;height:145px;transform:rotate(-5deg)}nav{display:flex;gap:6px;margin:7px 0 20px}nav button{border:0;border-radius:25px;padding:12px 22px;background:transparent;color:var(--muted)}nav button.active{background:#e7eddc;color:#3e603e;font-weight:700}.panel{border:1px solid var(--border);border-radius:28px;background:#fff;box-shadow:0 12px 35px #344b3206;padding:27px 32px}.roundbar{display:flex;justify-content:space-between;font-size:12px;color:var(--muted);gap:10px}#score{color:#a26b32}.progress{height:5px;background:#eff2e9;border-radius:6px;margin-top:16px;overflow:hidden}.progress i{display:block;height:100%;width:0;background:#95ad79;transition:width .4s}.stage{text-align:center;padding-top:28px}.tag{font-size:10px;letter-spacing:1px;color:#859376;border:1px solid #e3e8dc;padding:5px 10px;border-radius:20px}h2{font-size:24px;margin:18px 0 8px}.sub{font-size:13px;color:var(--muted);margin:0}.soundCircle{position:relative;width:126px;height:126px;margin:23px auto 6px;display:grid;place-items:center;border:1px solid #e8eedf;border-radius:50%;background:#f7f9f1}.listen{position:relative;z-index:2;border:0;color:white;background:var(--green);border-radius:50%;width:87px;height:87px;box-shadow:0 5px 0 #335435;font-size:27px;transition:transform .15s}.listen:hover{transform:translateY(-2px)}.listen.playing{background:#74935b}.ripples{position:absolute;inset:-10px;border:1px solid #dce7cc;border-radius:50%;opacity:0}.soundCircle:has(.playing) .ripples{animation:pulse 1.5s infinite}@keyframes pulse{0%{opacity:.8;transform:scale(.85)}100%{opacity:0;transform:scale(1.22)}}.wave{height:26px;display:flex;align-items:center;justify-content:center;gap:4px}.wave i{width:3px;border-radius:3px;background:#b6c6a6}.wave.moving i{animation:dance .65s ease-in-out infinite alternate}@keyframes dance{to{transform:scaleY(.3)}}#audioStatus{font-size:12px;color:var(--muted);margin:10px 0}.tools{display:flex;justify-content:center;align-items:center;gap:20px;font-size:12px;color:var(--muted)}.tools label{display:flex;align-items:center;gap:5px}input{accent-color:var(--green)}.hint{font-size:13px;background:#fbf4e6;border-radius:10px;padding:12px;line-height:1.6;color:#9a7139;margin:6px auto 16px;max-width:430px}.error{color:#a04e3a;font-size:13px}.choices{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:22px}.choice{position:relative;background:#fbfcf8;border:1.5px solid var(--border);border-radius:18px;padding:10px 10px 16px;color:var(--ink);transition:background .15s,border-color .15s,transform .15s}.choice:hover:not(:disabled){background:#f1f5e8;border-color:#b7cba6;transform:translateY(-3px)}.choice svg{width:100%;height:96px;display:block}.choice strong{font-size:16px;display:block}.choice small{font-size:10px;color:var(--muted);display:block;margin-top:4px}.choice.correct{border-color:#7a9d5b;background:#eef6e5}.choice.wrong{border-color:#dda17f;background:#fff3ec}.choice.dim{opacity:.55}.choice .mark{position:absolute;top:9px;right:11px;color:#527b3b;font-weight:bold}.actions{display:flex;align-items:center;justify-content:space-between;gap:12px;min-height:49px;margin-top:15px}#tip{font-size:11px;color:#939d8a}.primary{padding:13px 22px;border:0;background:var(--green);color:#fff;border-radius:12px;font-size:14px;font-weight:700}.feedback{background:#f2f6ec;padding:15px 18px;border-radius:12px;margin-top:18px;font-size:13px;line-height:1.8}.feedback strong{font-size:16px}.feedback p{margin:3px 0 0;color:#68775d}.note{display:flex;align-items:center;gap:17px;margin:24px 9px;color:#738066}.note>span{font-size:30px;color:#91a17e}.note strong{font-size:13px;font-weight:500}.note p{font-size:11px;line-height:1.8;margin:5px 0 0}footer{border-top:1px solid var(--border);display:flex;justify-content:space-between;align-items:center;color:#9aA18f;font-size:10px;padding:15px 0 25px}.libraryHead p{color:var(--muted);font-size:13px}.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.birdcard{border:1px solid var(--border);background:white;padding:16px;border-radius:20px}.birdcard svg{width:100%;height:120px}.birdcard h3{margin:0 0 5px;font-size:18px}.birdcard p{color:var(--muted);font-size:12px;line-height:1.8;min-height:43px}.birdcard .status{font-size:10px;color:#879477}.birdcard button{border:0;background:#eaf0df;color:#466a46;padding:10px 14px;border-radius:12px}.results{text-align:center;padding:40px 24px}.results .medal{font-size:62px}.results h2{font-size:30px}.results p{color:var(--muted);line-height:1.8}.results .buttons{display:flex;justify-content:center;gap:12px;flex-wrap:wrap}.resultRow{font-size:13px;background:#f7f9f1;max-width:440px;padding:11px 15px;border-radius:10px;display:flex;justify-content:space-between;margin:8px auto}dialog{border:1px solid var(--border);border-radius:22px;padding:28px;max-width:600px;width:calc(100% - 30px);color:var(--ink);box-shadow:0 15px 70px #20302030}dialog::backdrop{background:#23332666}dialog p{font-size:13px;line-height:1.9;color:var(--muted)}dialog a{color:var(--green)}.close{float:right;border:0;background:#f0f3e9;border-radius:50%;height:32px;width:32px;font-size:22px;color:var(--green)}.credit{padding:12px 0;border-bottom:1px solid var(--border);font-size:12px;line-height:1.8}.mobile{display:none}[hidden]{display:none!important}@media(max-width:620px){header{padding:20px 18px}.brand{font-size:18px}.brand small{display:none}main{padding:0 16px}.intro{padding:23px 3px 22px;position:relative}.intro p{font-size:13px}.intro h1{font-size:29px}#heroBird{position:absolute;width:100px;height:80px;right:0;top:10px;opacity:.45}.eyebrow{font-size:10px}.panel{padding:20px 16px;border-radius:23px}h2{font-size:20px}.choices{gap:8px;margin-top:16px}.choice{padding:8px 4px 12px;border-radius:14px}.choice svg{height:76px}.choice strong{font-size:14px}.choice small{font-size:8px}.cards{grid-template-columns:repeat(2,1fr);gap:10px}.birdcard{padding:13px}.birdcard svg{height:92px}.stage{padding-top:24px}.roundbar{font-size:11px}.actions{flex-wrap:wrap}.note{margin:20px 4px}.note p{font-size:10px}footer{font-size:9px}.mobile{display:block}#collection{font-size:11px;padding:4px}.primary{padding:12px 18px}}
@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}

/* Tone-marked pinyin accompanies bird names across quiz and collection. */
ruby{ruby-align:center;ruby-position:over}rt{font-family:system-ui,sans-serif;font-size:10px;font-weight:500;color:#667c58;letter-spacing:0;line-height:1.3}.choice strong{padding-top:12px;line-height:1.8}.birdcard h3{padding-top:13px;line-height:1.9}.birdcard h3 rt{font-size:11px}.feedback strong,.credit strong{line-height:2.5}.resultRow{padding-top:18px;line-height:1.8}@media(max-width:620px){.choice rt{font-size:10px}.choice strong{padding-top:11px}}

.lessonBar{display:flex;align-items:center;justify-content:space-between;gap:16px;background:#eaf0df;border-radius:18px;padding:22px;margin:20px 0}.lessonBar strong{display:block;line-height:2.4}.lessonBar p{font-size:12px;color:var(--muted);margin:4px 0}.lessonBar strong span{font-size:13px;font-weight:500}.lessonBar button{flex-shrink:0}.englishName{font-size:12px;color:var(--green);margin:4px 0 10px}.birdcard.lessonCurrent{outline:2px solid #74935b;background:#f6f9ef}@media(max-width:620px){nav{flex-wrap:wrap}nav button{padding:10px 12px}.lessonBar{flex-direction:column;align-items:stretch;padding:18px}.lessonBar button{width:100%}}

.birdPhoto{display:block;width:100%;object-fit:contain;background:#f0f3e9;border-radius:12px}.choice .birdPhoto{height:145px}.birdcard .birdPhoto{height:180px}#heroBird .birdPhoto{height:145px;border-radius:22px}#heroBird{transform:none}.choice{overflow:hidden}@media(max-width:620px){.choice .birdPhoto{height:100px}.birdcard .birdPhoto{height:130px}#heroBird .birdPhoto{height:80px}#heroBird{opacity:1}}

.visualSwitch{display:flex;align-items:center;gap:6px;flex-wrap:wrap;margin:-5px 0 20px;font-size:12px;color:var(--muted)}.visualSwitch>span{margin-right:6px}.visualSwitch button{border:1px solid var(--border);background:#fff;color:var(--green);border-radius:18px;padding:8px 12px}.visualSwitch button[aria-pressed=true]{background:var(--green);color:#fff}.birdVisual{display:block;width:100%}.birdVisual>svg{display:none;width:100%}.birdVisual.isIllustration>.birdPhoto{display:none}.birdVisual.isIllustration>svg{display:block}.choice .birdVisual>svg{height:145px}.birdcard .birdVisual>svg{height:180px}#heroBird .birdVisual>svg{height:145px}.birdcardTools{display:flex;gap:7px;flex-wrap:wrap}.birdcardTools button{font-size:12px;padding:10px}.birdcardTools [data-visual]{background:#f3f4ee;color:#6a765f}@media(max-width:620px){.choice .birdVisual>svg{height:100px}.birdcard .birdVisual>svg{height:130px}#heroBird .birdVisual>svg{height:80px}.birdcardTools{gap:5px}.birdcardTools button{font-size:11px;padding:8px}}

.catalogFilters{display:flex;align-items:end;gap:14px;flex-wrap:wrap;margin:20px 0}.catalogFilters label{display:grid;gap:7px;font-size:13px;color:var(--muted)}.catalogFilters input,.catalogFilters select{font:inherit;color:var(--ink);background:#fff;border:1px solid var(--border);border-radius:12px;padding:12px;min-height:44px}.catalogFilters input{min-width:240px}.catalogFilters>span{padding-bottom:12px;font-size:13px;color:var(--muted)}.habitatBadge{display:inline-block;margin:8px 0 0;padding:4px 9px;border-radius:20px;background:var(--pale);font-size:12px;color:var(--green)}.catalogEmpty{grid-column:1/-1;padding:30px;text-align:center;color:var(--muted)}@media(max-width:620px){.catalogFilters label:first-child{width:100%}.catalogFilters input{width:100%;min-width:0}.catalogFilters{gap:10px}}

/* Large, horizontally swipable quiz photographs. */
.isGame .intro{padding-top:8px;padding-bottom:13px}.isGame .intro h1{font-size:28px;margin:8px 0}.isGame .intro p,.isGame .intro .eyebrow,.isGame #heroBird{display:none}
#game{max-width:680px;margin:0 auto}.questionHeader{text-align:center;padding:13px 0 15px}.questionHeader h2{margin:10px 0 8px}.questionHeader p{font-size:12px;color:var(--muted);margin:0;line-height:1.6}
.carouselShell{min-width:0}.choices{display:flex;gap:12px;overflow-x:auto;scroll-snap-type:x mandatory;overscroll-behavior-x:contain;scrollbar-width:none;margin:0;padding:4px 0 6px}.choices::-webkit-scrollbar{display:none}.choice{flex:0 0 100%;min-width:0;scroll-snap-align:center;scroll-snap-stop:always;padding:12px 12px 15px;border-radius:22px;transform:none!important}.choice:hover:not(:disabled){transform:none}.choice .birdPhoto,.choice .birdVisual>svg{height:340px;height:clamp(230px,60vw,360px);border-radius:15px}.choice strong{font-size:26px;padding-top:21px;line-height:1.6}.choice rt{font-size:14px}.choice small{font-size:13px;margin-top:8px}.choiceAction{display:inline-block;margin-top:12px;padding:7px 13px;border-radius:20px;font-size:12px;background:#eaf0df;color:var(--green)}.choice:disabled .choiceAction{background:#f0f2eb;color:#87917f}.choice.correct .choiceAction{background:#dceccd;color:#456b32}.choice .mark{font-size:24px;background:white;border-radius:50%;width:34px;height:34px;top:20px;right:20px}.choice.dim{opacity:.65}
.carouselControls{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:6px 2px 0}.carouselArrow{height:40px;width:40px;border:1px solid var(--border);border-radius:50%;background:#f3f6ec;color:var(--green);font-size:29px;line-height:1}.carouselArrow:disabled{opacity:.3}.carouselMiddle{display:grid;gap:6px;text-align:center;color:var(--muted);font-size:11px}.carouselDots{display:flex;gap:8px;justify-content:center}.carouselDots button{width:8px;height:8px;padding:0;border:0;border-radius:50%;background:#dce3d2;box-shadow:0 0 0 7px transparent}.carouselDots button[aria-current=true]{background:var(--green);width:22px;border-radius:6px}
#game .stage{border-top:1px solid var(--border);padding-top:16px;margin-top:13px}#game .tag,#game .wave{display:none}#game .soundCircle{width:84px;height:84px;margin:10px auto 5px}#game .listen{width:64px;height:64px;font-size:23px}#game .sub{font-size:13px}#game .tools{margin-top:8px}#game .actions{margin-top:10px}
@media(max-width:620px){.isGame header{padding-top:14px;padding-bottom:10px}.isGame .intro{padding:0 3px 7px}.isGame .intro h1{font-size:25px}.isGame nav{margin:4px 0 15px}.isGame .visualSwitch{margin-bottom:13px}#game{padding:16px 13px}.questionHeader{padding-top:4px}.questionHeader h2{font-size:20px}.choice{padding:8px 8px 13px}.choice .birdPhoto,.choice .birdVisual>svg{height:clamp(240px,72vw,340px)}.choice strong{font-size:24px;padding-top:19px}.choice rt{font-size:13px}.choice small{font-size:12px}.choiceAction{margin-top:10px}.carouselControls{padding-top:7px}}

.feedbackMore{padding:4px 8px;white-space:nowrap}.birdInfo{max-width:420px}.birdInfo p{font-size:16px;line-height:1.9}.birdInfo>.primary{width:100%;margin-top:10px}
/* Fit the complete portrait quiz inside the current phone viewport. */
@media(max-width:620px) and (min-height:560px){
 body.isGame{height:100vh;height:100dvh;min-height:0;display:flex;flex-direction:column;overflow:hidden;padding:env(safe-area-inset-top,0px) 0 env(safe-area-inset-bottom,0px)}
 .isGame header{flex:0 0 auto;width:100%;padding:6px 12px;min-height:38px;gap:8px}.isGame .brand{font-size:16px;gap:6px}.isGame .logo{width:24px;height:24px;border-radius:8px;font-size:20px;line-height:24px}.isGame #collection{font-size:10px}.isGame #count{padding:2px 5px;margin-left:3px}
 .isGame main{flex:1;min-height:0;display:flex;flex-direction:column;width:100%;padding:0 10px 6px}.isGame .intro,.isGame .note,.isGame footer{display:none}
 .isGame nav{flex:0 0 auto;justify-content:space-between;gap:2px;flex-wrap:nowrap;margin:0 0 4px;min-height:32px}.isGame nav button{font-size:12px;padding:7px 9px;white-space:nowrap}
 .isGame .visualSwitch{flex:0 0 auto;justify-content:center;margin:0 0 5px;gap:5px;min-height:25px}.isGame .visualSwitch>span{font-size:10px;margin-right:2px}.isGame .visualSwitch button{padding:4px 10px;font-size:10px}
 .isGame #game{flex:1;min-height:0;width:100%;padding:10px;display:grid;grid-template-rows:14px 3px 35px minmax(120px,1fr) auto auto 38px;gap:5px;border-radius:19px;margin:0}
 .isGame .roundbar{font-size:10px;line-height:14px}.isGame .progress{height:3px;margin:0}.isGame .questionHeader{padding:0;display:flex;flex-direction:column;justify-content:center}.isGame .questionHeader h2{font-size:16px;line-height:20px;margin:0 0 2px}.isGame .questionHeader p{font-size:10px;line-height:13px;margin:0}
 .isGame .carouselShell{min-height:0;display:grid;grid-template-rows:minmax(0,1fr) 31px;gap:3px}.isGame #choices{height:100%;min-height:0;margin:0;padding:0;-webkit-overflow-scrolling:touch}.isGame .choice{height:100%;padding:5px 7px 6px;display:grid;grid-template-rows:minmax(0,1fr) 44px 16px;gap:0;border-radius:15px}
 .isGame #game .choice .birdVisual{height:100%;min-height:0}.isGame #game .choice .birdPhoto,.isGame #game .choice .birdVisual>svg{height:100%;min-height:0;max-height:none;border-radius:10px}.isGame #game .choice strong{font-size:20px;padding-top:13px;line-height:1.5;align-self:center}.isGame #game .choice rt{font-size:11px}.isGame #game .choice small{font-size:11px;line-height:16px;margin:0;align-self:center}.isGame .choiceAction{display:none}
 .isGame .carouselControls{padding:0;gap:10px;height:31px}.isGame .carouselArrow{height:30px;width:36px;font-size:24px}.isGame .carouselMiddle{gap:3px;font-size:10px}.isGame .carouselDots{gap:8px}.isGame .carouselDots button{height:6px;width:6px}.isGame .carouselDots button[aria-current=true]{width:18px}
 .isGame #game .stage{grid-row:5;min-height:72px;display:grid;grid-template-columns:60px minmax(0,1fr);grid-template-rows:24px 38px;column-gap:8px;text-align:left;padding:6px 0 0;margin:0;align-items:center}.isGame #game .stage .sub{display:none}.isGame #game .soundCircle{grid-column:1;grid-row:1 / span 2;width:58px;height:58px;margin:0}.isGame #game .listen{width:48px;height:48px;font-size:20px}.isGame #audioStatus{grid-column:2;grid-row:1;margin:0;font-size:11px;line-height:1.4}.isGame #game .tools{grid-column:2;grid-row:2;justify-content:space-between;gap:4px;margin:0;font-size:11px}.isGame #hint{font-size:12px;padding:4px 6px;min-height:36px}.isGame #loop{width:16px;height:16px}.isGame #error{display:none}.isGame #skip{grid-column:2;grid-row:3;padding:3px;font-size:11px}
 .isGame #feedback{grid-row:6;display:flex;align-items:center;justify-content:space-between;gap:4px;margin:0;padding:4px 8px;border-radius:9px;min-height:38px}.isGame #feedback strong{font-size:13px;line-height:2.3}.isGame #feedback rt{font-size:9px}.isGame #feedback p{display:none}.isGame .feedbackMore{font-size:11px;min-height:30px;padding:3px 4px}
 .isGame .actions{grid-row:7;justify-content:flex-end;min-height:38px;margin:0;gap:0}.isGame #tip{display:none}.isGame #next{min-height:38px;width:100%;font-size:14px;padding:8px 14px}
 .isGame #results{flex:1;min-height:0;padding:15px}.isGame .results .medal{font-size:35px}.isGame .results h2{font-size:23px;margin:8px 0}.isGame .results p{font-size:12px;line-height:1.5;margin:8px 0}.isGame .resultRow{padding:10px 9px 6px;font-size:12px;line-height:1.5;margin:5px auto}.isGame .results .buttons{margin-top:12px!important}.isGame .results .primary{font-size:13px;padding:10px 12px}
}