@import url('https://fonts.googleapis.com/css2?family=Nunito:wght@400;500;600;700;800;900&family=Noto+Sans+SC:wght@400;500;600;700&display=swap');
:root{--cream:#fff9ef;--paper:#fffefa;--teal:#53aba2;--teal-dark:#0e5856;--mint:#daf0e9;--gold:#ffe1a9;--blue:#d9edf6;--ink:#1c3735;--muted:#637d76;--line:#e7dbc9;--pale:#eff7f1;--shadow:0 16px 45px rgba(14,88,86,.08);--radius:22px}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:95px}
body{margin:0;background:var(--cream);color:var(--ink);font-family:'Nunito',system-ui,-apple-system,Segoe UI,sans-serif;line-height:1.6}
button,input,select{font:inherit}
button,a{-webkit-tap-highlight-color:transparent}
a{color:inherit;text-decoration:none}
.site-header{height:78px;padding:0 max(5vw,22px);display:flex;align-items:center;justify-content:space-between;gap:24px;background:rgba(255,249,239,.92);border-bottom:1px solid rgba(231,219,201,.75);position:sticky;top:0;z-index:20;backdrop-filter:blur(14px)}
.brand{display:flex;align-items:center;gap:10px;font-size:15px;font-weight:900;letter-spacing:.06em;color:var(--teal-dark);white-space:nowrap}
.brand img{width:42px;height:42px;object-fit:contain}
.brand b{display:block;color:var(--teal);font-size:11px;letter-spacing:.19em}
nav{display:flex;gap:30px;align-items:center;font-size:13px;font-weight:800;color:var(--muted)}
nav a:hover{color:var(--teal-dark)}
.menu-toggle{display:none;border:0;background:var(--mint);border-radius:12px;padding:8px 12px;color:var(--teal-dark)}
.hero{max-width:1200px;margin:auto;min-height:560px;padding:75px 28px 68px;display:grid;grid-template-columns:1.1fr .9fr;gap:60px;align-items:center}
.eyebrow{display:inline-flex;align-items:center;font-size:10px;font-weight:900;letter-spacing:.14em;color:var(--teal-dark);background:var(--mint);padding:7px 12px;border-radius:100px}
.hero h1{font-size:clamp(36px,4.3vw,57px);line-height:1.12;letter-spacing:-.04em;color:var(--teal-dark);margin:22px 0 18px}
.hero h1 em{font-style:normal;color:var(--teal)}
.hero-copy>p{max-width:520px;color:var(--muted);font-size:16px;margin:0 0 27px}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap}
.button{border:1px solid transparent;border-radius:13px;padding:12px 18px;display:inline-flex;justify-content:center;align-items:center;gap:12px;font-size:13px;font-weight:900;cursor:pointer;transition:transform .18s,box-shadow .18s,background .18s}
.button:hover{transform:translateY(-2px)}
.primary{background:var(--teal-dark);color:white;box-shadow:0 7px 18px rgba(14,88,86,.13)}
.primary:hover{background:#0a4847}
.secondary{background:var(--paper);color:var(--teal-dark);border-color:var(--line)}
.full{width:100%;margin-top:10px}
.hero-note{margin-top:24px;font-size:12px;color:var(--muted);display:flex;gap:8px;align-items:center}
.dot{width:8px;height:8px;border-radius:50%;background:var(--teal);display:inline-block}
.hero-art{min-height:360px;position:relative;display:flex;align-items:center;justify-content:center;background:#fff4e2;border-radius:36px;overflow:hidden}
.sun{position:absolute;width:260px;height:260px;border-radius:50%;background:var(--mint);top:20px;right:25px}
.hero-card{position:relative;z-index:2;width:225px;height:265px;background:var(--paper);border:1px solid var(--line);border-radius:23px;box-shadow:var(--shadow);display:flex;flex-direction:column;align-items:center;justify-content:center;transform:rotate(-5deg);gap:7px}
.mini-label{font-size:9px;letter-spacing:.14em;font-weight:900;color:var(--muted)}
.hero-card strong{font-family:'Noto Sans SC',sans-serif;font-size:63px;color:var(--teal-dark);line-height:1.2}
.pinyin{font-size:21px;font-weight:900;color:var(--teal)}
.translation{font-size:12px;color:var(--muted)}
.hero-mascot{position:absolute;width:100px;height:100px;object-fit:contain;right:9%;bottom:11%;z-index:3;transform:rotate(8deg)}
.speech{position:absolute;right:6%;top:16%;background:white;padding:9px 13px;border-radius:14px;color:var(--teal-dark);font-weight:900;box-shadow:var(--shadow);font-family:'Noto Sans SC',sans-serif}
.speech small{display:block;font-family:'Nunito',sans-serif;color:var(--muted);font-size:10px;text-align:center}
.section{max-width:1200px;margin:0 auto;padding:70px 28px}
.section-heading{display:flex;justify-content:space-between;align-items:end;gap:35px;margin-bottom:28px}
.section-heading h2{font-size:clamp(26px,3vw,36px);line-height:1.2;letter-spacing:-.03em;color:var(--teal-dark);margin:13px 0 0}
.section-heading>p{max-width:440px;margin:0;color:var(--muted);font-size:14px}
.deck-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:22px}
.deck-card{display:grid;grid-template-columns:.78fr 1.22fr;background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);padding:17px;gap:22px;box-shadow:0 6px 25px rgba(14,88,86,.035)}
.deck-art{border-radius:17px;background:var(--mint);min-height:245px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:9px;color:var(--teal-dark)}
.deck-art strong{font-family:'Noto Sans SC',sans-serif;font-size:53px;line-height:1.2}
.deck-art>span:last-child{font-size:10px;font-weight:900;letter-spacing:.14em}
.deck-number{background:var(--gold);border-radius:50px;padding:5px 10px;font-size:9px;font-weight:900}
.work-art{background:#e4f0f8}
.deck-info{padding:10px 8px 10px 0;display:flex;flex-direction:column;align-items:flex-start}
.status{font-size:9px;letter-spacing:.08em;font-weight:900;color:var(--teal-dark)}
.muted-status{color:var(--muted)}
.deck-info h3{font-size:21px;color:var(--teal-dark);margin:12px 0 7px}
.deck-info p{font-size:13px;color:var(--muted);margin:0 0 12px;line-height:1.6}
.deck-info .button{margin-top:auto}
.learn-section{max-width:none;background:#f3f8f3;padding-left:max(28px,calc((100% - 1144px)/2));padding-right:max(28px,calc((100% - 1144px)/2))}
.learning-layout{display:grid;grid-template-columns:280px minmax(0,1fr);gap:25px;align-items:start}
.learning-sidebar,.study-area,.quiz-box{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);box-shadow:0 8px 30px rgba(14,88,86,.035)}
.learning-sidebar{padding:20px;min-width:0}
.sidebar-title{display:flex;flex-direction:column;gap:3px;margin-bottom:20px}
.sidebar-title span{font-size:9px;letter-spacing:.14em;color:var(--teal);font-weight:900}
.sidebar-title b{font-size:17px;color:var(--teal-dark)}
.learning-sidebar label{display:block;font-size:11px;font-weight:900;color:var(--muted);margin:13px 0 6px}
input,select{width:100%;border:1px solid var(--line);border-radius:10px;background:#fffefa;padding:10px 11px;color:var(--ink);font-size:12px;outline:none}
input:focus,select:focus{border-color:var(--teal);box-shadow:0 0 0 3px rgba(83,171,162,.12)}
.word-list{margin-top:15px;display:flex;flex-direction:column;gap:5px;max-height:340px;overflow:auto}
.word-item{display:grid;grid-template-columns:32px 1fr auto;gap:8px;align-items:center;text-align:left;padding:9px;border:1px solid transparent;border-radius:10px;background:transparent;cursor:pointer;color:var(--ink)}
.word-item:hover,.word-item.active{background:var(--mint);border-color:#c5e4da}
.word-item .num{font-size:10px;color:var(--muted)}
.word-item .hanzi{font-family:'Noto Sans SC',sans-serif;font-size:17px;color:var(--teal-dark);font-weight:800}
.word-item .meaning{font-size:10px;color:var(--muted);text-align:right}
.study-area{padding:24px;min-width:0}
.study-top{display:flex;align-items:center;justify-content:space-between;gap:10px;font-size:10px;font-weight:900;letter-spacing:.08em;color:var(--muted);margin-bottom:15px}
.category-badge{padding:5px 10px;border-radius:50px;background:var(--blue);color:var(--teal-dark);letter-spacing:0}
.flashcard{position:relative;width:100%;min-height:350px;border:1px solid var(--line);border-radius:19px;background:#fff8ed;padding:20px;display:flex;flex-direction:column;text-align:center;cursor:pointer;color:var(--ink);overflow:hidden}
.card-top{display:flex;justify-content:space-between;align-items:center;width:100%;font-size:10px;font-weight:900;color:var(--teal-dark)}
.card-top>span:first-child{background:var(--teal);color:white;border-radius:9px;padding:7px 11px}
.card-brand{letter-spacing:.08em;font-size:9px;color:var(--muted)}
.card-main{flex:1;display:flex;flex-direction:column;justify-content:center;align-items:center;gap:12px}
.card-main strong{font-family:'Noto Sans SC',sans-serif;font-size:clamp(54px,7vw,78px);line-height:1.2;color:var(--teal-dark)}
.card-main>span{font-size:25px;font-weight:900;color:var(--teal)}
.card-main small,.card-back small{font-size:11px;color:var(--muted);margin-top:10px}
.card-back{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:5px;padding:12px}
.card-back .answer-label{font-size:9px;letter-spacing:.12em;color:var(--teal-dark);font-weight:900;background:var(--mint);border-radius:30px;padding:4px 9px;margin-top:7px}
.card-back strong{font-size:26px;color:var(--teal-dark)}
.card-back>span[lang="zh"]{font-family:'Noto Sans SC',sans-serif;font-size:25px;font-weight:800}
#examplePinyin{font-weight:800;color:var(--teal)}
.card-back small{max-width:420px;text-align:center}
.hidden{display:none!important}
.audio-actions,.study-controls{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin-top:14px}
.audio-actions .button{flex:1}
.icon-button{border:0;background:transparent;color:var(--muted);font-size:12px;font-weight:900;padding:10px;cursor:pointer}
.study-controls{justify-content:space-between;align-items:center}
.study-controls .button{min-width:145px}
.study-hint{text-align:center;font-size:11px;color:var(--muted);margin:15px 0 0}
.quiz-section{padding-top:65px}
.quiz-box{max-width:760px;margin:0 auto;padding:30px;text-align:center}
.quiz-progress{display:flex;justify-content:space-between;color:var(--muted);font-size:10px;font-weight:900;letter-spacing:.08em}
.quiz-box h3{font-size:17px;color:var(--muted);margin:25px 0 7px}
.quiz-hanzi{font-family:'Noto Sans SC',sans-serif;font-size:57px;color:var(--teal-dark);display:block;margin:8px 0 23px}
.quiz-options{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}
.quiz-option{padding:13px 15px;text-align:left;border:1px solid var(--line);border-radius:12px;background:#fffefa;color:var(--teal-dark);font-size:13px;font-weight:800;cursor:pointer}
.quiz-option:hover:not(:disabled){border-color:var(--teal);background:var(--mint)}
.quiz-option.correct{border-color:#4c9b71;background:#e6f5e9}
.quiz-option.wrong{border-color:#d98978;background:#fff0eb}
.quiz-option:disabled{cursor:default}
.quiz-feedback{min-height:28px;padding:10px 0 0;font-size:12px;font-weight:900;color:var(--teal-dark)}
.quiz-actions{display:flex;justify-content:center;gap:10px;flex-wrap:wrap;margin-top:10px}
.about-strip{max-width:1144px;margin:20px auto 65px;padding:25px 30px;display:grid;grid-template-columns:95px 1fr auto;gap:25px;align-items:center;background:#fff1dc;border-radius:24px}
.about-strip img{width:88px;height:88px;object-fit:contain}
.about-strip h2{font-size:22px;color:var(--teal-dark);margin:9px 0 5px;line-height:1.25}
.about-strip p{font-size:12px;color:var(--muted);margin:0;max-width:600px}
.site-footer{border-top:1px solid var(--line);padding:23px max(5vw,22px);display:flex;justify-content:space-between;gap:20px;font-size:11px;color:var(--muted)}
.toast{position:fixed;bottom:22px;left:50%;transform:translate(-50%,20px);opacity:0;pointer-events:none;background:var(--teal-dark);color:white;padding:10px 16px;border-radius:12px;font-size:12px;z-index:50;transition:.2s}
.toast.show{opacity:1;transform:translate(-50%,0)}
@media(max-width:900px){.hero{gap:30px;min-height:500px}.deck-card{grid-template-columns:1fr}.deck-art{min-height:180px}.learning-layout{grid-template-columns:230px minmax(0,1fr)}.study-area{padding:17px}.flashcard{min-height:330px}.about-strip{margin-left:22px;margin-right:22px}}
@media(max-width:680px){.site-header{height:68px;padding:0 18px}.brand{font-size:12px}.brand img{width:36px;height:36px}.brand b{font-size:9px}.menu-toggle{display:block}nav{display:none;position:absolute;top:67px;left:0;right:0;padding:16px 22px 20px;background:var(--cream);border-bottom:1px solid var(--line);flex-direction:column;align-items:stretch;gap:14px}nav.open{display:flex}nav a{padding:5px 0}.hero{grid-template-columns:1fr;padding:46px 20px 45px;gap:32px}.hero h1{font-size:39px}.hero-copy>p{font-size:14px}.hero-art{min-height:310px}.hero-card{width:190px;height:235px}.hero-card strong{font-size:55px}.hero-mascot{width:76px;height:76px;right:8%;bottom:8%}.section{padding:48px 20px}.section-heading{display:block;margin-bottom:22px}.section-heading>p{margin-top:13px;font-size:13px}.deck-grid{grid-template-columns:1fr}.deck-card{grid-template-columns:.72fr 1.28fr;padding:12px;gap:14px}.deck-art{min-height:220px}.deck-art strong{font-size:40px}.deck-info h3{font-size:18px}.deck-info p{font-size:12px}.deck-info .button{font-size:11px;padding:10px 8px}.learn-section{padding-left:20px;padding-right:20px}.learning-layout{grid-template-columns:1fr}.learning-sidebar{padding:16px}.word-list{max-height:210px;display:grid;grid-template-columns:repeat(2,minmax(0,1fr))}.word-item{grid-template-columns:24px 1fr;gap:5px;padding:7px}.word-item .meaning{display:none}.study-area{padding:14px}.flashcard{min-height:340px;padding:15px}.card-brand{font-size:8px}.card-main strong{font-size:62px}.card-main>span{font-size:22px}.audio-actions{flex-direction:column}.study-controls{gap:3px}.study-controls .button{min-width:0;padding:11px 13px}.icon-button{font-size:10px;padding:8px 2px}.quiz-box{padding:20px 15px}.quiz-options{grid-template-columns:1fr}.quiz-hanzi{font-size:49px}.about-strip{margin:0 20px 40px;padding:20px;grid-template-columns:58px 1fr;gap:15px}.about-strip img{width:58px;height:58px}.about-strip h2{font-size:18px}.about-strip p{font-size:11px}.about-strip>.button{grid-column:1/-1}.site-footer{flex-direction:column;gap:5px;padding:20px}.study-top{font-size:9px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{transition:none!important}}