:root{color:#212121;font-synthesis:none;--red:#d32f2f;--red-hover:#b71c1c;--orange:#ff9800;--yellow:#ffc107;--muted:#616161;--line:#e0e0e0;background:#f5f5f5;font-family:Microsoft YaHei,PingFang SC,system-ui,sans-serif}*{box-sizing:border-box}body{min-width:320px;margin:0}button,input,textarea,select{font:inherit}button{cursor:pointer;border:0}button:disabled{cursor:not-allowed;opacity:.5}button:focus-visible,a:focus-visible{outline-offset:4px;outline:3px solid #ff9800}.app-shell{border-top:8px solid var(--red);isolation:isolate;min-height:100vh;position:relative}.public-scene{background:linear-gradient(#fff4ed 0,snow 190px,#f5f5f5 420px)}.scene-decoration{pointer-events:none;z-index:-1;position:absolute;inset:0;overflow:hidden}.red-flag{aspect-ratio:3/2;object-fit:contain;width:clamp(90px,9vw,160px);height:auto;display:block;position:absolute;top:24px}.flag-left{left:24px}.flag-right{right:24px}.ribbon{border-radius:50% 50% 0 0;width:125%;height:90px;position:absolute;bottom:-50px;left:-12%;transform:rotate(-3deg)}.ribbon-gold{background:#ffc107;bottom:-43px;transform:rotate(-4deg)}.ribbon-red{background:linear-gradient(100deg,#b71c1c,#e53935 55%,#d32f2f)}.stage-page{max-width:1240px;margin:auto;padding:clamp(32px,5vh,70px) 32px 105px;position:relative}.public-scene .hero-copy{max-width:950px;margin:auto}.public-scene .hero-copy:after{content:"";background:linear-gradient(90deg,#ffc107 0 22%,#d32f2f 22% 78%,#ffc107 78%);border-radius:2px;width:100px;height:4px;margin:0 auto 28px;display:block}.hero-copy{text-align:center}.eyebrow{color:var(--red);letter-spacing:2px;margin:0 0 16px;font-size:16px;font-weight:700}.hero-copy h1{letter-spacing:2px;color:var(--red);margin:0;font-size:clamp(30px,4vw,54px);font-weight:800;line-height:1.5}.hero-copy h1 em{font-style:normal}.subcopy{color:#555;margin:16px 0 32px;font-size:clamp(16px,1.6vw,21px);line-height:1.8}.quiz-card-wrap{margin-top:28px}.quiz-card{border:1px 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