:root{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans TC",sans-serif;color:#edf3f8;background:#101824;--bg:#101824;--panel:#1c2a38;--panel2:#223345;--accent:#3d8bff;--accent2:#6fb2ff;--danger:#ff5a5f;--ok:#4fd18b;--muted:#9fb0bf;--star:#ffcf4a;--border:#33495d}*{box-sizing:border-box}body{margin:0;background:var(--bg);min-height:100vh}.topbar{position:sticky;top:0;z-index:20;display:flex;justify-content:space-between;align-items:center;padding:14px 18px;background:#0a2439;border-bottom:1px solid #183b56}.brand{font-size:12px;color:#86b6da}.screen-title{font-size:19px;font-weight:800;margin-top:2px}.top-subtitle{font-weight:700;color:#c6d8e6}.page{max-width:880px;margin:0 auto;padding:18px 14px 40px}.card,.hero-card,.question-card,.result-summary{background:var(--panel);border:1px solid var(--border);border-radius:18px;padding:18px;box-shadow:0 8px 24px rgba(0,0,0,.16)}.hero-card{display:flex;align-items:center;gap:20px;margin-bottom:16px}.progress-ring{--pct:0;width:110px;height:110px;flex:0 0 110px;border-radius:50%;display:grid;place-items:center;background:conic-gradient(#ff8b17 calc(var(--pct)*1%),#344353 0);position:relative}.progress-ring:before{content:"";position:absolute;width:82px;height:82px;border-radius:50%;background:var(--panel)}.progress-ring span{position:relative;font-weight:800}.hero-copy h2{margin:0 0 6px}.big-number{font-size:30px;font-weight:900}.muted{color:var(--muted)}.small{font-size:13px}.resume-card{display:flex;justify-content:space-between;gap:14px;align-items:center;margin-bottom:16px}.resume-card h3{margin:4px 0}.resume-card p{margin:0;color:var(--muted)}.eyebrow{font-size:12px;color:#80baff;font-weight:700}.grid-actions{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-bottom:16px}.mode-card{min-height:120px;text-align:left;padding:18px;border-radius:16px;border:1px solid var(--border);background:var(--panel);color:#fff;cursor:pointer}.mode-card strong{display:block;font-size:20px;margin-bottom:8px}.mode-card span{color:var(--muted);line-height:1.45}.mode-card.accent{border-color:#377bc2;background:#173c60}.status-card h3{margin-top:0}.status-row{display:flex;justify-content:space-between;padding:9px 0;border-top:1px solid rgba(255,255,255,.07)}.btn{border:0;border-radius:12px;padding:13px 18px;font-weight:800;font-size:16px;cursor:pointer;color:white;background:var(--accent)}.btn.secondary{background:#314355}.btn.danger{background:var(--danger)}.btn:disabled{opacity:.35;cursor:not-allowed}.setup-page{display:grid;gap:14px}.setup-page h2{margin-top:0}.choice-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}.count-choice{padding:22px;border-radius:14px;border:1px solid #3b5872;background:#20364a;color:white;font-size:22px;font-weight:900;cursor:pointer}.select-input{width:100%;margin:10px 0 16px;padding:14px;background:#132231;color:#fff;border:1px solid #3a5268;border-radius:10px;font-size:17px}.field-label{display:block;color:var(--muted)}.notice{padding:12px;border-radius:10px;background:#112c43;color:#b9daf3;margin-bottom:16px}.quiz-toolbar{display:grid;grid-template-columns:1fr auto 1fr;align-items:center;margin-bottom:12px}.icon-btn,.flag-btn{border:1px solid var(--border);background:var(--panel);color:#fff;border-radius:12px;padding:10px 14px;font-size:16px;cursor:pointer}.icon-btn{justify-self:start}.flag-btn{justify-self:end}.flag-btn.active{color:#171717;background:var(--star);border-color:var(--star)}.timer{font-size:24px;font-weight:900;font-variant-numeric:tabular-nums}.timer.danger{color:#ff787d}.question-meta{color:#9db4c5;font-weight:700;margin-bottom:12px}.reverse-tag{display:inline-block;margin-left:8px;padding:3px 8px;border-radius:999px;background:#5a281f;color:#ffc6b5;font-size:12px}.question-text{font-size:clamp(22px,4vw,34px);font-weight:700;line-height:1.5;white-space:pre-wrap}.source-warning{margin-top:12px;padding:10px;background:#4a3512;color:#ffe1a0;border-radius:10px}.options{display:grid;gap:12px;margin-top:20px}.option{display:grid;grid-template-columns:44px 1fr;align-items:start;gap:10px;text-align:left;background:#162536;border:1px solid #38516a;color:#fff;border-radius:14px;padding:15px;font-size:clamp(18px,3vw,24px);line-height:1.45;cursor:pointer}.option.selected{border-color:#63a8ff;background:#183d64;box-shadow:0 0 0 2px rgba(99,168,255,.15)}.option-letter{width:36px;height:36px;border-radius:10px;display:grid;place-items:center;background:#2c4a66;font-weight:900}.feedback{margin-top:18px;border-radius:14px;padding:15px;line-height:1.55}.feedback.correct{background:#123b2a;border:1px solid #2b8a60}.feedback.wrong{background:#4a1719;border:1px solid #a83a3f}.feedback-title{font-size:20px;font-weight:900;margin-bottom:6px}.memory-tip{margin-top:7px;color:#d9e8f2}.nav-bar{display:grid;grid-template-columns:1fr auto 1fr;gap:10px;align-items:center;margin-top:14px}.nav-bar .btn:last-child{justify-self:stretch}.nav-mid{text-align:center;color:var(--muted);font-size:13px}.number-grid{display:grid;grid-template-columns:repeat(8,1fr);gap:8px}.num-btn{padding:10px 4px;border:1px solid #46627a;border-radius:9px;background:#1b2c3b;color:#fff;cursor:pointer}.num-btn.danger{border-color:#a5474b;background:#4a2023}.num-btn.star{border-color:#b39534;background:#4b421f;color:#ffe480}.stack-actions{display:grid;gap:10px}.ok-text{color:var(--ok);font-weight:800}.result-summary{text-align:center;margin-bottom:14px}.score{font-size:58px;font-weight:900;color:#7dc0ff}.score span{font-size:16px;color:var(--muted);margin-left:6px}.summary-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-top:14px}.summary-grid div{background:#132130;border-radius:12px;padding:12px}.summary-grid strong,.summary-grid span{display:block}.summary-grid strong{font-size:22px}.summary-grid span{color:var(--muted);font-size:12px}.filter-row{display:flex;gap:8px;margin:12px 0}.chip{border:1px solid var(--border);background:#1a2938;color:#cbd9e4;border-radius:999px;padding:9px 13px;cursor:pointer}.chip.active{background:#2a6eb0;color:white;border-color:#2a6eb0}.review-list{display:grid;gap:10px;margin-bottom:14px}.review-card{background:#1b2a38;border:1px solid var(--border);border-radius:14px;padding:14px}.review-card.wrong-card{background:#4b1618;border-color:#8d363a}.review-head{display:flex;justify-content:space-between;color:#a9bfd0}.review-q{font-size:18px;line-height:1.5;margin:8px 0}.review-answer{color:#e4d7d7}.review-correct{color:#7ec7ff;font-weight:800;margin-top:5px}.empty-state{text-align:center;padding:30px;color:var(--muted)}.fatal{padding:24px;color:white}.fatal pre{white-space:pre-wrap}.home-page,.results-page{padding-bottom:60px}@media(max-width:700px){.grid-actions{grid-template-columns:1fr}.hero-card{align-items:flex-start}.progress-ring{width:86px;height:86px;flex-basis:86px}.progress-ring:before{width:64px;height:64px}.number-grid{grid-template-columns:repeat(6,1fr)}.summary-grid{grid-template-columns:repeat(2,1fr)}.top-subtitle{font-size:12px}.nav-bar{grid-template-columns:1fr 1fr}.nav-mid{display:none}.question-card{padding:14px}.question-text{font-size:24px}}

/* V1.0 cross-platform responsive refinements */
button,select{touch-action:manipulation}
@media (hover:hover) and (pointer:fine){.btn:hover,.mode-card:hover,.count-choice:hover,.option:hover,.icon-btn:hover,.flag-btn:hover,.chip:hover,.num-btn:hover{filter:brightness(1.08)}}
@media (min-width:1100px){.page{max-width:1080px;padding-left:24px;padding-right:24px}.grid-actions{grid-template-columns:repeat(3,minmax(0,1fr))}.question-text{font-size:30px}.options{grid-template-columns:1fr 1fr}.option{min-height:92px}}
@media (max-width:420px){.page{padding-left:10px;padding-right:10px}.topbar{padding-left:12px;padding-right:12px}.question-text{font-size:22px}.option{font-size:18px;padding:13px}.number-grid{grid-template-columns:repeat(5,1fr)}}
@media (display-mode:standalone){body{padding-bottom:env(safe-area-inset-bottom)}.topbar{padding-top:calc(14px + env(safe-area-inset-top))}}

/* V1.2 cloud sync */
.cloud-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:14px}
.cloud-actions .btn{flex:1 1 160px}
.small-note{font-size:13px;margin-top:12px;line-height:1.55}