:root{color-scheme:light;font-family:system-ui,-apple-system,"Noto Sans JP",sans-serif;color:#172b4d;background:#edf3fb}*{box-sizing:border-box}html,body{margin:0;height:100%;overflow:hidden}.app{width:min(100%,480px);height:100dvh;min-height:300px;margin:auto;background:white;display:flex;flex-direction:column;box-shadow:0 0 28px #243e6518}.header,.footer{flex-shrink:0;text-align:center;background:#1769aa;color:white;padding:14px 12px}.header h1{font-size:1.12rem;margin:0}.footer{font-size:.76rem;padding:10px}.main{flex:1;min-height:0;overflow:auto;padding:22px 16px}.panel{background:#f8fbff;border:1px solid #d9e7f5;border-radius:16px;padding:22px 16px}.lead{text-align:center;line-height:1.8;white-space:normal}.info{display:flex;justify-content:center;gap:10px;flex-wrap:wrap;margin:24px 0;font-size:.85rem}.info span{background:#e7f1fb;padding:8px;border-radius:9px}label{display:block;font-weight:700;margin-bottom:9px}input{width:100%;padding:13px;border:1px solid #b5c9dd;border-radius:10px;font:inherit}.hint{color:#52687c;font-size:.8rem;line-height:1.6}button{width:100%;padding:15px;background:#1769aa;color:white;border:0;border-radius:11px;font-weight:700;font-size:1rem;margin-top:12px}button:disabled{background:#93a5b7;cursor:not-allowed}.notice{margin-top:18px;padding:12px;border-radius:9px;background:#eaf4ff;line-height:1.6;font-size:.87rem}

.center{text-align:center}.question{font-size:1.2rem;font-weight:700;line-height:1.75;text-align:center;margin:26px 0}.choice{background:#fff;color:#173c69;border:2px solid #a8c6e4;text-align:left;line-height:1.5;margin:9px 0;cursor:pointer}.choice:hover,.choice:focus-visible{background:#eaf4ff}.countdown{font-size:4rem;text-align:center;font-weight:800;color:#1769aa}.feedback{text-align:center;font-size:5rem;font-weight:900;margin:30px 0}.good{color:#087a3d}.bad{color:#b12836}.link-button{display:block;background:#1769aa;color:white;text-decoration:none;border-radius:11px;padding:15px;text-align:center;font-weight:700;margin-top:16px}.results{display:grid;grid-template-columns:1fr;gap:12px;margin:22px 0}.results>div{padding:14px;background:#e7f1fb;border-radius:12px;text-align:center}.results strong{display:block;font-size:1.6rem}.results small{display:block;color:#506780;margin-top:5px}
.toplist{max-height:190px;overflow-y:auto;border:1px solid #d5e4f4;border-radius:10px;padding:4px 10px}.toprow{font-size:.88rem;border-bottom:1px solid #e2edf7;padding:8px 2px}.rankrow{display:flex;align-items:center;justify-content:space-between;gap:8px;padding:12px 4px;border-bottom:1px solid #dce8f4;font-size:.82rem}.rankrow span:nth-child(2){flex:1;overflow-wrap:anywhere}.pager{display:flex;gap:10px}.pager .link-button{flex:1}.secondary{background:#5d7084}.sharelinks{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-top:16px}.sharelinks a{background:#e8f1fb;padding:10px;text-align:center;border-radius:9px;color:#194c7c;text-decoration:none}

/* Design update: centered question area and consistent share buttons */
.main.quiz-main{display:flex;flex-direction:column}
.quiz-content{flex:1;min-height:0;display:flex;flex-direction:column;justify-content:center;width:100%;padding:8px 0}
.quiz-content .question{margin:14px 0 20px;overflow-wrap:anywhere}
.quiz-content .choice{text-align:center;overflow-wrap:anywhere}
.sharelinks a,.sharelinks button{display:flex;align-items:center;justify-content:center;min-height:46px;padding:10px;border:0;border-radius:9px;background:#e8f1fb;color:#194c7c;text-align:center;text-decoration:none;font:inherit;font-weight:700;margin:0;cursor:pointer}
.sharelinks a:hover,.sharelinks button:hover{background:#d7e9fc}
.sharelinks .share-copy{grid-column:1 / -1}

/* Layout patch v2: start panel and vertical/horizontal centering */
.start-box{margin:22px 0;padding:20px 16px;border:2px solid #c4dced;border-radius:16px;background:#eaf4ff;box-shadow:0 3px 12px #173c6910}
.start-box form{margin:0}
.start-box .notice{background:#fff;border:1px solid #d6e6f5}
.main.quiz-main,.main.countdown-main{display:flex;flex-direction:column}
.main.quiz-main>.panel,.main.countdown-main>.panel{flex:1;display:flex;flex-direction:column;min-height:min-content}
.main.quiz-main>.panel>h2,.main.countdown-main>.panel>h2{text-align:center;margin:0 0 12px}
.main.quiz-main .quiz-content,.main.countdown-main .countdown-content{flex:1;display:flex;flex-direction:column;justify-content:center;align-items:center;min-height:min-content;width:100%}
.main.quiz-main .quiz-content form,.main.countdown-main .countdown-content .link-button{width:100%}
.main.quiz-main .quiz-content .question{width:100%;text-align:center}
.main.countdown-main .countdown-content .countdown{margin:12px 0}
.main.countdown-main .countdown-content .hint{text-align:center}

/* v3: centered question/countdown card, scroll long content safely */
.main.quiz-main,.main.countdown-main{display:flex;flex-direction:column;justify-content:center;align-items:center;overflow-y:auto}
.main.quiz-main>.panel,.main.countdown-main>.panel{width:100%;flex:0 0 auto;min-height:0;margin:auto;display:flex;flex-direction:column;justify-content:center;align-items:center}
.main.quiz-main .quiz-content,.main.countdown-main .countdown-content{width:100%;flex:0 0 auto;min-height:0}
.main.quiz-main .quiz-content form{width:100%}
.main.quiz-main .quiz-content .question{width:100%;text-align:center}
/* Whole start area from description through ready message */
.start-box>.lead{margin-top:0}
.start-box>.info{margin:16px 0 22px}

/* Result-page navigation: separate from SNS sharing grid */
.result-actions{display:flex;flex-direction:column;gap:12px;margin:22px 0 12px;width:100%}
.result-actions .result-action{box-sizing:border-box;display:flex;align-items:center;justify-content:center;width:100%;min-height:50px;padding:14px 16px;border-radius:11px;color:#fff;text-align:center;text-decoration:none;font-weight:700;line-height:1.5}
.result-actions .result-action-ranking{background:#1769aa}
.result-actions .result-action-retry{background:#26734d}
.result-actions .result-action-ranking:hover,.result-actions .result-action-ranking:focus-visible{background:#115486}
.result-actions .result-action-retry:hover,.result-actions .result-action-retry:focus-visible{background:#1b593b}

/* Feedback v2: explicit class and true full-card viewport centering */
.main.feedback-main{display:flex;flex-direction:column;overflow-y:auto;align-items:stretch;justify-content:safe center}
.main.feedback-main>.panel{box-sizing:border-box;width:100%;flex:0 0 auto;margin:auto;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center}
.main.feedback-main>.panel>h2{display:block;width:100%;margin:0 0 10px;text-align:center!important;font-size:1.8rem;line-height:1.35}
.main.feedback-main .feedback{display:block;width:100%;font-size:clamp(10rem,45vw,16rem)!important;line-height:1;margin:8px auto 14px;text-align:center!important;font-weight:900}
.main.feedback-main .hint{width:100%;text-align:center!important}
.main.feedback-main .link-button{width:100%}
.main.feedback-main #feedback-timer{margin:0}

/* Stage 5 */
.policy-link{display:block;margin:0 auto 8px;background:transparent;border:0;color:inherit;text-decoration:underline;cursor:pointer;font:inherit}
.policy-overlay[hidden]{display:none!important}.policy-overlay{position:fixed;inset:0;z-index:9999;background:rgba(0,0,0,.65);display:flex;align-items:center;justify-content:center;padding:12px}
.policy-dialog{background:#fff;color:#222;border-radius:12px;width:min(650px,100%);max-height:92dvh;display:flex;flex-direction:column;overflow:hidden;box-shadow:0 15px 50px #0005}
.policy-head,.policy-foot{padding:14px 18px;flex-shrink:0;background:#f4f7fb}.policy-head{font-weight:bold}.policy-foot{border-top:1px solid #ddd;text-align:center}.policy-foot button{min-width:180px}.policy-scroll{overflow-y:auto;overscroll-behavior:contain;padding:14px 20px;flex:1;min-height:0}.policy-scroll h3{margin-top:1.3em}.policy-open{overflow:hidden}
.best-entry{padding:12px;border-bottom:1px solid #ddd}.best-entry form{margin-top:10px}.best-entry input{width:100%;box-sizing:border-box}.ended-modal{padding:20px;border:2px solid #e3a2a2;border-radius:12px;text-align:center}

.start-box .quiz-rules-title{text-align:center;}

/* Stage 5: log-name page centered within the available vertical space. */
.main.name-main{display:flex;flex-direction:column;overflow-y:auto;align-items:stretch;}
.main.name-main>.panel{width:100%;flex:0 0 auto;margin:auto;}
.main.name-main>.panel>h2{text-align:center;}
.main.name-main label[for="nickname"]{text-align:center;}

/* Stage 5: requested heading alignment and inline best records (no nested scroll frame). */
.start-box .quiz-rules-title{text-align:center!important;}
.panel>.result-heading{text-align:center!important;}
.best-list{width:100%;max-height:none;overflow:visible;border:1px solid #d5e4f4;border-radius:10px;padding:4px 10px;}
.best-list .best-entry:last-child{border-bottom:0;}
/* Center the result heading; other page headings may also be centered. */
.main>.panel>h2{text-align:center;}

/* Stage 5: center the quiz-ended dialog vertically */
.main.ended-main{display:flex;flex-direction:column;overflow-y:auto;}
.main.ended-main>.panel{width:100%;flex:0 0 auto;margin:auto;}
.main.ended-main>.panel>h2:empty{display:none;}
.main.ended-main .ended-modal{width:100%;}
.main.feedback-main #feedback-timer{font-weight:700;font-size:.95rem;}

/* Stage 5: quiz-ended card vertically and horizontally centered */
.main.ended-main{display:flex;flex-direction:column;align-items:stretch;justify-content:safe center;overflow-y:auto;}
.main.ended-main>.panel{width:100%;flex:0 0 auto;margin:auto;display:flex;flex-direction:column;align-items:center;justify-content:center;}
.main.ended-main>.panel>h2:empty{display:none;}
.main.ended-main .ended-modal{width:100%;text-align:center;line-height:1.8;}
.main.ended-main .ended-modal h3,.main.ended-main .ended-modal p{text-align:center;}

/* Stage 5 shared footer */
.footer{display:flex;flex-direction:column;align-items:center;gap:3px;padding:7px 12px;font-size:.76rem;line-height:1.35}.footer-back{color:#fff;text-decoration:underline;text-underline-offset:2px;font-weight:700}.footer-copyright,.footer-powered{color:#fff}

/* Stage 5: footer order and evenly spaced lines. */
.footer{gap:9px;padding:12px 12px;line-height:1.4}
.footer .footer-back{order:1;display:block}
.footer .policy-link{order:2;width:auto;margin:0;padding:0;background:transparent;border:0;border-radius:0;color:#fff;font:inherit;font-weight:400;text-decoration:underline;text-underline-offset:2px}
.footer .footer-copyright{order:3}
.footer .footer-powered{order:4}