@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@400;500;700;900&display=swap');
:root{--ink:#172b28;--green:#0d765d;--mint:#d9f466;--cream:#f6f3e9;--line:#d8ddcf;--orange:#ff7858}*{box-sizing:border-box}html,body{margin:0;min-height:100%;font-family:'Noto Sans SC',sans-serif;color:var(--ink);background:var(--cream)}body{background-image:radial-gradient(#c9cec0 1px,transparent 1px);background-size:22px 22px}.grain{position:fixed;inset:0;pointer-events:none;opacity:.16;background:url("data:image/svg+xml,%3Csvg viewBox='0 0 180 180' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.15'/%3E%3C/svg%3E")}header{height:86px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 max(5vw,25px);background:rgba(246,243,233,.88);backdrop-filter:blur(10px);position:relative;z-index:10}.brand{display:flex;gap:12px;align-items:center;color:var(--ink);text-decoration:none;font-size:21px;font-weight:900;letter-spacing:2px}.brand small{display:block;font-size:9px;letter-spacing:3px;color:#6d7974;margin-top:3px}.logo,.mini-logo{width:46px;height:46px;background:var(--ink);color:var(--mint);display:grid;place-items:center;font-family:serif;font-size:26px;border-radius:4px;transform:rotate(-3deg)}nav{display:flex;align-items:center;gap:28px}nav button,.link{border:0;background:none;color:var(--ink);font-weight:700;cursor:pointer}.sound{border-left:1px solid var(--line);padding-left:28px!important;color:var(--green)!important}.page{display:none;min-height:calc(100vh - 150px)}.page.active{display:block}#home{position:relative;padding:7vh max(7vw,25px) 4vh;overflow:hidden}.hero{max-width:610px;position:relative;z-index:3}.eyebrow{font-size:12px;letter-spacing:3px;font-weight:900;color:var(--green);display:flex;align-items:center;gap:9px}.eyebrow i{display:inline-block;width:28px;height:3px;background:var(--green)}h1{font-size:clamp(46px,6vw,86px);line-height:1.08;margin:25px 0 22px;letter-spacing:-5px}h1 em{font-style:normal;color:var(--green);position:relative}h1 em:after{content:'';position:absolute;left:0;bottom:3px;width:100%;height:9px;background:var(--mint);z-index:-1;transform:rotate(-2deg)}.hero>p{font-size:17px;line-height:1.9;color:#61706b;max-width:530px}.tags{display:flex;flex-wrap:wrap;gap:8px;margin:24px 0 36px}.tags span{border:1px solid #bfc9be;border-radius:50px;padding:7px 14px;font-size:12px;background:#faf9f1}.primary{border:0;border-radius:4px;background:var(--ink);color:white;padding:17px 25px;font-size:15px;font-weight:700;cursor:pointer;box-shadow:7px 7px 0 var(--mint);transition:.18s}.primary:hover{transform:translate(-2px,-2px);box-shadow:10px 10px 0 var(--mint)}.primary b{color:var(--mint);margin-left:35px;font-size:20px}.visual{position:absolute;right:4vw;top:6vh;width:42vw;height:500px}.timer-card{position:absolute;left:50%;top:48%;transform:translate(-50%,-50%) rotate(2deg);width:230px;height:270px;background:var(--green);color:white;border-radius:8px;display:flex;flex-direction:column;align-items:center;justify-content:center;box-shadow:18px 20px 0 #cddd91}.timer-card:before{content:'';position:absolute;inset:10px;border:1px solid rgba(255,255,255,.25)}.timer-card small{letter-spacing:4px}.timer-card strong{font-size:112px;line-height:1;font-weight:900}.timer-card span{font-weight:bold}.orbit{position:absolute;border:1px solid #aab9ad;border-radius:50%;left:50%;top:48%;transform:translate(-50%,-50%)}.o1{width:380px;height:380px}.o2{width:500px;height:500px}.float{position:absolute;background:white;border:1px solid var(--line);padding:11px 17px;border-radius:4px;font-weight:900;box-shadow:4px 5px 0 #dfe4d7}.f1{top:10%;left:0;transform:rotate(-5deg)}.f2{top:12%;right:0;transform:rotate(6deg)}.f3{bottom:13%;left:0;transform:rotate(4deg)}.f4{bottom:10%;right:4%;transform:rotate(-4deg)}.rules{margin-top:8vh;border-top:1px solid var(--line);display:grid;grid-template-columns:repeat(3,1fr);max-width:930px}.rules>div{padding:25px 24px 0 0;display:flex;gap:15px}.rules b{font-size:30px;color:#b3bdac}.rules strong,.rules span{display:block}.rules span{font-size:12px;color:#748078;line-height:1.8}.rules strong{color:var(--ink);font-size:15px}.section-head{padding:55px max(8vw,25px) 30px;display:flex;align-items:flex-end;justify-content:space-between}.section-head h2{font-size:45px;margin:12px 0 3px}.section-head p{color:#77827e}.small{padding:13px 20px}.podium{display:flex;align-items:end;justify-content:center;gap:14px;min-height:180px}.pod{width:190px;text-align:center;background:#e8eadf;padding:20px;border-radius:8px 8px 0 0;border:1px solid var(--line)}.pod.first{min-height:180px;background:var(--green);color:white}.pod .medal{font-size:25px}.pod strong,.pod span{display:block}.pod span{font-size:12px;opacity:.7}.rankbox{max-width:900px;margin:25px auto 70px;background:#faf9f3;border:1px solid var(--line);border-radius:7px;overflow:hidden}.rankrow{display:grid;grid-template-columns:100px 1fr 160px 160px;padding:17px 25px;border-bottom:1px solid var(--line);align-items:center}.rankrow.head{font-size:11px;letter-spacing:1px;background:#e8eadf;color:#66736c}.rankrow .num{font-size:20px;font-weight:900}.rankrow .pts{font-weight:900;color:var(--green)}.empty{text-align:center;padding:45px;color:#87918b}.gamepage{padding:5vh 20px}.gamebar{max-width:820px;margin:auto;display:grid;grid-template-columns:130px 1fr 130px;align-items:center;text-align:center}.gamebar span,.gamebar small{display:block;font-size:11px;color:#7c8782}.gamebar strong{font-size:38px}.progress{height:8px;background:#dce1d7;border-radius:10px;overflow:hidden}.progress i{display:block;width:100%;height:100%;background:var(--green)}.gamecard{max-width:720px;margin:5vh auto;background:#fffdf7;border:1px solid var(--line);padding:55px;border-radius:10px;text-align:center;box-shadow:13px 13px 0 #dfe5d6}.qnum{color:var(--green);font-weight:bold}.question{font-size:clamp(45px,7vw,75px);font-weight:900;margin:45px 0}.gamecard form{display:flex;max-width:440px;margin:auto}.gamecard input,.dialog input{min-width:0;flex:1;border:2px solid var(--ink);padding:15px;font-size:20px;background:white;outline:none}.gamecard form button{border:0;background:var(--ink);color:white;font-weight:bold;padding:0 25px}.hint{font-size:12px;color:#89918d;margin-top:22px}.modal{position:fixed;inset:0;background:rgba(23,43,40,.72);z-index:30;display:none;place-items:center;padding:20px;backdrop-filter:blur(5px)}.modal.open{display:grid}.dialog{position:relative;width:min(440px,100%);background:var(--cream);padding:38px;border-radius:8px;box-shadow:12px 12px 0 var(--mint)}.dialog .mini-logo{margin:auto}.dialog h3{text-align:center;font-size:30px;margin:18px 0 5px}.dialog>p{text-align:center;color:#6d7974}.dialog label{display:block;font-size:12px;font-weight:bold;margin:25px 0 8px}.dialog input{width:100%;font-size:16px}.full{width:100%;margin-top:20px}.dialog>small{display:block;text-align:center;color:#89918d;margin-top:18px}.x{position:absolute;right:15px;top:12px;border:0;background:none;font-size:25px;cursor:pointer}.center{justify-content:center;margin-top:20px}.bigscore{display:flex;align-items:baseline;justify-content:center;color:var(--green)}.bigscore strong{font-size:90px}.bigscore span{font-weight:bold}.stat{display:grid;grid-template-columns:1fr 1fr;border:1px solid var(--line);margin:10px 0}.stat span{padding:15px;text-align:center;font-size:12px}.stat span+span{border-left:1px solid var(--line)}.stat b{display:block;font-size:21px;margin-top:5px}.result .link{display:block;margin:22px auto 0}footer{border-top:1px solid var(--line);height:64px;padding:0 5vw;display:flex;align-items:center;justify-content:space-between;color:#78827c;font-size:11px;letter-spacing:1px}
@media(max-width:850px){header{height:70px}.brand small,nav button:not(.sound),.sound{display:none}.visual{position:relative;right:auto;top:auto;width:100%;height:330px;margin-top:35px}.timer-card{width:170px;height:200px}.timer-card strong{font-size:80px}.o1{width:270px;height:270px}.o2{display:none}.float{font-size:12px}.rules{grid-template-columns:1fr;margin-top:15px}.rules>div{padding-top:15px}.section-head{padding-top:35px}.pod{width:31%;padding:12px 5px}.rankrow{grid-template-columns:55px 1fr 85px 90px;padding:14px 10px;font-size:12px}.gamebar{grid-template-columns:85px 1fr 85px}.gamecard{padding:40px 20px}.question{margin:35px 0}h1{letter-spacing:-3px}footer span:last-child{display:none}}.choices{display:grid;grid-template-columns:1fr 1fr;gap:13px;max-width:520px;margin:0 auto}.choice{min-height:72px;border:2px solid #cbd2c6;border-radius:6px;background:#fff;color:var(--ink);cursor:pointer;font-size:24px;font-weight:900;display:flex;align-items:center;text-align:left;padding:10px 16px;transition:.13s}.choice:hover{border-color:var(--green);background:#f2f8e5;transform:translateY(-2px)}.choice kbd{width:29px;height:29px;display:grid;place-items:center;border:1px solid #c3ccc0;border-radius:4px;background:#eff1e9;color:#78837b;font:700 12px sans-serif;margin-right:18px}.choice.correct{border-color:var(--green);background:#dff3b5;color:#075d48}.choice.wrong{border-color:#d9513d;background:#ffe2d8;color:#9f271c}.choice.correct kbd{background:var(--green);color:white}.choice.wrong kbd{background:#d9513d;color:white}@media(max-width:550px){.choices{grid-template-columns:1fr;gap:8px}.choice{min-height:55px;font-size:20px}.gamecard{margin-top:3vh}.question{margin:24px 0}.hint{margin-top:14px}}
.frac{display:inline-flex;vertical-align:middle;flex-direction:column;align-items:center;line-height:1;margin:0 .1em;min-width:1.05em}.frac b,.frac i{font-style:normal;font-weight:inherit;padding:0 .12em}.frac b{border-bottom:2px solid currentColor;padding-bottom:.08em}.frac i{padding-top:.08em}.question .frac{font-size:.78em}.choice .frac{font-size:.82em}
/* 排行榜仅展示名次、选手与答对题数 */
.rankrow{grid-template-columns:100px 1fr 160px}.result{max-height:92vh;overflow-y:auto}.poster-wrap{margin:20px 0 4px;text-align:center}.poster-wrap img{display:block;width:100%;border:1px solid var(--line);border-radius:7px;box-shadow:5px 5px 0 #dfe5d6;-webkit-touch-callout:default;user-select:auto}.poster-wrap p{margin:12px 0 8px;color:#77827e;font-size:12px}.download{border:1px solid var(--ink);background:transparent;color:var(--ink);padding:11px 19px;border-radius:4px;font-weight:700;cursor:pointer}.download:hover{background:var(--ink);color:#fff}@media(max-width:850px){.rankrow{grid-template-columns:55px 1fr 85px}.dialog.result{padding:28px 24px}.poster-wrap img{max-height:48vh;object-fit:contain;background:#edf0df}}

/* 成绩弹窗直接展示海报，移除重复的成绩摘要区域 */
.result .poster-wrap{margin-top:0}.result>.x{z-index:2;background:rgba(246,243,233,.92);width:36px;height:36px;border-radius:50%;line-height:1}.result .poster-wrap img{margin-top:0}
/* 手机端通过长按图片保存，不显示桌面端下载按钮 */
@media(max-width:850px),(hover:none) and (pointer:coarse){.poster-wrap .download{display:none}}

.hero-actions{display:flex;align-items:center;gap:18px}.rank-entry{border:2px solid var(--ink);border-radius:4px;background:transparent;color:var(--ink);padding:15px 23px;font-size:15px;font-weight:800;cursor:pointer;transition:.18s}.rank-entry b{margin-left:22px;color:var(--green);font-size:18px}.rank-entry:hover{background:var(--ink);color:#fff;transform:translateY(-2px)}.back-home{display:block;margin:0 0 18px max(2vw,10px);border:1px solid #bfc9be;border-radius:50px;background:rgba(255,253,247,.8);color:var(--ink);padding:9px 16px;font-weight:700;cursor:pointer}.back-home:hover{border-color:var(--green);color:var(--green);background:#fff}@media(max-width:550px){.hero-actions{gap:12px}.hero-actions .primary,.rank-entry{padding:14px 16px}.hero-actions .primary b,.rank-entry b{margin-left:10px}.back-home{margin-left:0}}

.rank-back-home{display:block;margin:28px 0 -28px max(8vw,25px);border:1px solid #bfc9be;border-radius:50px;background:rgba(255,253,247,.85);color:var(--ink);padding:9px 16px;font-weight:700;cursor:pointer}.rank-back-home:hover{border-color:var(--green);color:var(--green);background:#fff}@media(max-width:850px){.rank-back-home{margin-top:20px;margin-bottom:-18px}}
/* 手机端页尾仅将大聪明实验室居中显示 */
@media(max-width:850px){footer{justify-content:center;text-align:center}footer span:first-child{display:block;width:100%}footer span:last-child{display:none}}

.rankrow .pts small{display:block;margin-top:3px;color:#7b8780;font-size:11px;font-weight:500}

.ranking-rules{max-width:900px;margin:0 auto 30px;padding:20px 24px;background:#fffdf7;border:1px solid var(--line);border-left:5px solid var(--green);border-radius:7px;color:#61706b}.ranking-rules strong{display:block;margin-bottom:10px;color:var(--ink);font-size:17px}.ranking-rules ol{margin:0;padding-left:22px;display:grid;grid-template-columns:1fr 1fr;gap:7px 35px;font-size:13px;line-height:1.7}@media(max-width:650px){.ranking-rules{margin:0 20px 25px;padding:17px 18px}.ranking-rules ol{grid-template-columns:1fr;gap:5px}}

.rank-pagination{display:flex;align-items:center;justify-content:center;gap:18px;padding:18px 15px;background:#f1f2e9;color:#65726c;font-size:13px}.rank-pagination:empty{display:none}.rank-pagination button{border:1px solid #bfc9be;border-radius:4px;background:#fffdf7;color:var(--ink);padding:9px 15px;font-weight:700;cursor:pointer}.rank-pagination button:hover:not(:disabled){border-color:var(--green);color:var(--green)}.rank-pagination button:disabled{opacity:.38;cursor:not-allowed}.rankbox+.ranking-rules{margin-top:-40px;margin-bottom:70px}@media(max-width:650px){.rank-pagination{gap:10px}.rank-pagination button{padding:8px 10px}.rankbox+.ranking-rules{margin-top:-45px;margin-bottom:55px}}
/* 放大排行榜规则说明文字 */
.ranking-rules strong{font-size:20px}.ranking-rules ol{font-size:16px;line-height:1.85}
@media(max-width:650px){.ranking-rules strong{font-size:19px}.ranking-rules ol{font-size:15px;line-height:1.8}}
/* 排名规则始终一行一条 */
.ranking-rules ol{grid-template-columns:1fr;gap:8px}

/* 页尾俱乐部入口 */
footer{justify-content:center;text-align:center}.club-link{color:var(--ink);font-size:14px;font-weight:700;letter-spacing:.5px;text-decoration:none}.club-link:hover{color:var(--green);text-decoration:underline;text-underline-offset:4px}