/* 品管研習 — iOS 風格介面
   版面概念：iOS「大標題＋分組清單」。頁面底色為 grouped background，內容放在無框線、無陰影的圓角群組中；
   導覽列與分頁列為半透明毛玻璃；強調色只用系統藍，綠／橘／紅僅表示狀態。 */
:root{
 --font:-apple-system,BlinkMacSystemFont,"SF Pro Text","PingFang TC","Heiti TC","Noto Sans TC",system-ui,sans-serif;
 --font-display:-apple-system,BlinkMacSystemFont,"SF Pro Display","PingFang TC","Noto Sans TC",system-ui,sans-serif;
 --bg:#f2f2f7;--card:#ffffff;--card2:#f2f2f7;--text:#000000;--muted:#6c6c70;--faint:#aeaeb2;
 --line:rgba(60,60,67,.18);--fill:rgba(118,118,128,.12);--fill2:rgba(118,118,128,.2);
 --blue:#007aff;--tint:rgba(0,122,255,.1);--green:#34c759;--green-text:#248a3d;--red:#ff3b30;--red-text:#d70015;
 --orange:#ff9500;--orange-text:#c93400;--indigo:#5856d6;--bar:rgba(249,249,249,.82);--shadow-alert:0 10px 40px rgba(0,0,0,.18);
 --r-group:12px;--r-card:16px;
 color-scheme:light;font-family:var(--font);font-size:17px;color:var(--text);background:var(--bg);
 -webkit-text-size-adjust:100%;text-size-adjust:100%;
}
@media(prefers-color-scheme:dark){:root:not([data-theme=light]){
 --bg:#000000;--card:#1c1c1e;--card2:#2c2c2e;--text:#ffffff;--muted:#98989f;--faint:#636366;
 --line:rgba(84,84,88,.6);--fill:rgba(118,118,128,.24);--fill2:rgba(118,118,128,.32);
 --blue:#0a84ff;--tint:rgba(10,132,255,.18);--green:#30d158;--green-text:#30d158;--red:#ff453a;--red-text:#ff6961;
 --orange:#ff9f0a;--orange-text:#ffb340;--indigo:#5e5ce6;--bar:rgba(22,22,24,.8);--shadow-alert:0 10px 40px rgba(0,0,0,.5);color-scheme:dark}}
:root[data-theme=dark]{
 --bg:#000000;--card:#1c1c1e;--card2:#2c2c2e;--text:#ffffff;--muted:#98989f;--faint:#636366;
 --line:rgba(84,84,88,.6);--fill:rgba(118,118,128,.24);--fill2:rgba(118,118,128,.32);
 --blue:#0a84ff;--tint:rgba(10,132,255,.18);--green:#30d158;--green-text:#30d158;--red:#ff453a;--red-text:#ff6961;
 --orange:#ff9f0a;--orange-text:#ffb340;--indigo:#5e5ce6;--bar:rgba(22,22,24,.8);--shadow-alert:0 10px 40px rgba(0,0,0,.5);color-scheme:dark}

*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--text);font:inherit;-webkit-tap-highlight-color:transparent;-webkit-font-smoothing:antialiased}
button,input,select,textarea{font:inherit;color:inherit}
button,a,select,input,label{touch-action:manipulation}
button{cursor:pointer;border:0;background:none;color:var(--blue);min-height:44px;padding:10px 16px;border-radius:12px;font-weight:600;font-size:17px}
button:disabled{opacity:.35;cursor:default}
button:not(:disabled):active{opacity:.55}
button:focus-visible,a:focus-visible,input:focus-visible+span,select:focus-visible{outline:3px solid color-mix(in srgb,var(--blue) 60%,transparent);outline-offset:2px}
a{color:var(--blue);text-decoration:none}
h1,h2,h3{font-family:var(--font-display);text-wrap:balance}
h1{font-size:34px;line-height:1.15;font-weight:700;letter-spacing:.2px;margin:0}
h2{font-size:20px;font-weight:700;margin:0 0 12px}
h3{font-size:17px;font-weight:600;margin:0 0 6px}
p{line-height:1.55;margin:6px 0}
small,.muted{color:var(--muted);font-size:15px}
.icon{width:22px;height:22px;flex:none;vertical-align:middle;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

/* ---------- 頁面框架 ---------- */
main{max-width:760px;margin:0 auto;padding:0 max(20px,env(safe-area-inset-right)) calc(110px + env(safe-area-inset-bottom)) max(20px,env(safe-area-inset-left))}
.topbar{position:sticky;top:0;z-index:20;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;min-height:44px;margin:0 calc(-1*max(20px,env(safe-area-inset-left))) 0;padding:env(safe-area-inset-top) max(12px,env(safe-area-inset-right)) 0 max(20px,env(safe-area-inset-left));background:transparent;border-bottom:.5px solid transparent;transition:background .2s,border-color .2s}
body.scrolled .topbar{background:var(--bar);-webkit-backdrop-filter:saturate(180%) blur(20px);backdrop-filter:saturate(180%) blur(20px);border-bottom-color:var(--line)}
.navstatus{font-size:13px;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;min-width:0}
.offline-ready{color:var(--green-text)}
.offline-failed{color:var(--orange-text)}
.navtitle{font-weight:600;font-size:17px;opacity:0;transition:opacity .2s;white-space:nowrap;max-width:50vw;overflow:hidden;text-overflow:ellipsis}
body.scrolled .navtitle{opacity:1}
.topbar>button{justify-self:end}
.iconbtn{width:44px;padding:0;display:grid;place-items:center;border-radius:50%}
.iconbtn .icon{width:24px;height:24px}
.link{padding:8px 4px;font-weight:400}
.done{font-weight:600}
.heading{padding:4px 0 18px}
.heading p{margin:4px 0 0;color:var(--muted);font-size:15px}

/* ---------- 群組與清單 ---------- */
.ghead{display:flex;align-items:baseline;justify-content:space-between;gap:12px;margin:26px 4px 7px}
.ghead h2{margin:0;font-size:13px;font-weight:400;color:var(--muted);font-family:var(--font)}
.ghead .link{min-height:0;padding:0;font-size:15px}
.group,.card{background:var(--card);border-radius:var(--r-group);overflow:hidden;margin:0 0 18px}
.card{padding:16px;border-radius:var(--r-card)}
.group>.empty{padding:28px 16px}
.lrow{position:relative;display:flex;align-items:center;gap:12px;width:100%;min-height:44px;padding:11px 16px;margin:0;border-radius:0;text-align:left;color:var(--text);font-weight:400;background:var(--card)}
.lrow:not(:last-child)::after{content:"";position:absolute;right:0;bottom:0;left:16px;border-bottom:.5px solid var(--line)}
.lrow:has(.ltile):not(:last-child)::after{left:58px}
button.lrow:not(:disabled):active,label.lrow:active{background:var(--fill);opacity:1}
.ltile{width:30px;height:30px;border-radius:7px;display:grid;place-items:center;color:#fff;flex:none}
.ltile .icon{width:19px;height:19px;stroke-width:2}
.ltile.blue{background:var(--blue)}.ltile.orange{background:var(--orange)}.ltile.indigo{background:var(--indigo)}.ltile.green{background:var(--green)}
.lmain{flex:1;min-width:0;display:flex;flex-direction:column;gap:2px}
.ltitle{font-size:17px;line-height:1.35;overflow-wrap:anywhere}
.lsub{font-size:13px;line-height:1.4;color:var(--muted)}
.ldetail{font-size:17px;color:var(--muted);white-space:nowrap;font-variant-numeric:tabular-nums}
.chev{width:8px;height:8px;border-top:2px solid var(--faint);border-right:2px solid var(--faint);transform:rotate(45deg);margin-left:2px;flex:none;border-radius:1px}
.chrow .progress{margin:6px 0 2px}
.clamp{display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.lmeta{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--muted);flex-wrap:wrap}
.chip{font-size:12px;font-weight:600;padding:2px 8px;border-radius:6px;background:var(--fill)}
.chip.status-review{background:color-mix(in srgb,var(--orange) 16%,transparent)}
.chip.status-mastered{background:color-mix(in srgb,var(--green) 16%,transparent)}
.chip.status-learning{background:var(--tint)}
.wrongrow{align-items:flex-start}.wrongrow .chev{margin-top:8px}

/* 勾選清單 */
.pick .lrow{cursor:pointer}
.pick input{position:absolute;inset:0;width:100%;height:100%;margin:0;opacity:0;cursor:pointer}
.checkmark{width:20px;height:20px;flex:none}
.pick input:checked~.checkmark::after{content:"";display:block;width:6px;height:12px;margin:1px 0 0 6px;border:solid var(--blue);border-width:0 2.5px 2.5px 0;transform:rotate(45deg)}
.pick input:focus-visible~.lmain{outline:2px solid var(--blue);outline-offset:4px;border-radius:4px}

/* 分段控制 */
.seg{display:flex;padding:2px;background:var(--fill);border-radius:9px;margin:0 0 6px;gap:0}
.seg label{position:relative;flex:1;min-width:0}
.seg input{position:absolute;inset:0;width:100%;height:100%;margin:0;opacity:0;cursor:pointer;z-index:1}
.seg span{display:flex;align-items:center;justify-content:center;min-height:34px;padding:4px 6px;border-radius:7px;font-size:14px;font-weight:500;text-align:center;line-height:1.2;transition:background .15s}
.seg label+label span{box-shadow:-1px 0 0 -0px transparent}
.seg input:checked+span{background:var(--card);font-weight:600;box-shadow:0 3px 8px rgba(0,0,0,.12),0 0 0 .5px rgba(0,0,0,.04)}
:root[data-theme=dark] .seg input:checked+span{background:#636366}
@media(prefers-color-scheme:dark){:root:not([data-theme=light]) .seg input:checked+span{background:#636366}}
.seg input:focus-visible+span{outline:2px solid var(--blue)}
.customrow{display:none}
form:has(input[name=count][value=custom]:checked) .customrow{display:block;margin-top:10px}
.inputrow input{width:90px;text-align:right;border:0;background:transparent;font-size:17px;color:var(--blue);padding:0}
.inputrow input:focus{outline:none}

/* 開關 */
.switchrow{cursor:pointer}
.switch{appearance:none;-webkit-appearance:none;position:relative;width:51px;height:31px;margin:0;flex:none;border-radius:16px;background:var(--fill2);transition:background .2s;cursor:pointer}
.switch::after{content:"";position:absolute;top:2px;left:2px;width:27px;height:27px;border-radius:50%;background:#fff;box-shadow:0 3px 8px rgba(0,0,0,.15),0 1px 1px rgba(0,0,0,.16);transition:transform .2s}
.switch:checked{background:var(--green)}
.switch:checked::after{transform:translateX(20px)}

/* 按鈕 */
.primary{background:var(--blue);color:#fff}
.secondary{background:var(--tint);color:var(--blue)}
.wide{width:100%;display:flex;align-items:center;justify-content:center;gap:8px}
.big{min-height:50px;border-radius:14px;margin-top:8px}
main>.wide{margin:0 0 18px}
.download{display:inline-flex;min-height:44px;align-items:center}

/* 搜尋 */
.searchbar{margin:0 0 14px}
.searchbar input,input[type=search]{width:100%;min-height:36px;padding:7px 12px 7px 34px;border:0;border-radius:10px;background:var(--fill) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%238e8e93' stroke-width='2.4' stroke-linecap='round'%3E%3Ccircle cx='11' cy='11' r='7'/%3E%3Cpath d='m20 20-3.5-3.5'/%3E%3C/svg%3E") no-repeat 10px 50%/16px;font-size:17px;color:var(--text);-webkit-appearance:none}
.searchbar input::placeholder{color:var(--muted)}

/* 一般表單控制（錯題篩選、設定） */
select{width:100%;min-height:44px;padding:8px 32px 8px 12px;border:0;border-radius:10px;background:var(--card) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%238e8e93' stroke-width='2.4' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m7 10 5-5 5 5M7 14l5 5 5-5'/%3E%3C/svg%3E") no-repeat right 10px center/14px;color:var(--text);font-size:15px;-webkit-appearance:none;appearance:none}
input[type=number]{width:100%;min-height:44px;padding:8px 12px;border:0;border-radius:10px;background:var(--card);color:var(--text);font-size:17px}
.filters{display:flex;gap:8px;margin:0 0 14px}
.filters>*{flex:1;min-width:0}
.formrow{margin:14px 0}
.formrow label{display:block;color:var(--muted);font-size:13px;margin:0 0 6px}
.check{display:flex;align-items:center;gap:10px;font-size:17px;line-height:1.5}
input[type=checkbox]:not(.switch){width:22px;height:22px;accent-color:var(--blue)}
.twocol{display:grid;grid-template-columns:1fr 1fr;gap:18px}

/* ---------- 首頁 ---------- */
.summary{padding:18px}
.summaryrow{display:flex;align-items:center;gap:20px;margin-bottom:16px}
.rings{width:132px;height:132px;flex:none;transform:rotate(-90deg)}
.rings circle{fill:none;stroke-width:14;stroke-linecap:round}
.rings .track.c{stroke:color-mix(in srgb,var(--blue) 18%,transparent)}
.rings .track.m{stroke:color-mix(in srgb,var(--green) 20%,transparent)}
.rings .fill.c{stroke:var(--blue)}
.rings .fill.m{stroke:var(--green)}
.ringstats{display:grid;gap:12px;min-width:0}
.ringstats>div{display:flex;flex-direction:column}
.lbl{font-size:13px;font-weight:600}
.lbl.c{color:var(--blue)}.lbl.m{color:var(--green-text)}
.ringstats strong{font-family:var(--font-display);font-size:30px;font-weight:700;line-height:1.1;font-variant-numeric:tabular-nums}
.ringstats strong small{font-size:17px;color:var(--text);font-weight:600}
.ringstats>div>small{font-size:13px}
.metrics{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin:0 0 4px}
.metric{background:var(--card);border-radius:var(--r-group);padding:12px 14px;display:flex;flex-direction:column;gap:2px;min-width:0}
.metric small:first-child{font-size:13px;font-weight:600;color:var(--muted)}
.metric strong{font-family:var(--font-display);font-size:26px;font-weight:700;font-variant-numeric:tabular-nums;line-height:1.2}
.metric strong small{font-size:15px;color:var(--text);font-weight:600}
.metric small:last-child{font-size:12px}
.note{padding:12px 14px;border-radius:var(--r-group);background:var(--tint);color:var(--text);font-size:15px;line-height:1.5;margin:0 0 18px}
.note .secondary{background:var(--card);margin-top:8px;min-height:36px;padding:6px 14px;font-size:15px}
.note.update{display:flex;flex-wrap:wrap;align-items:center;gap:10px;justify-content:space-between;margin-top:8px}
.progress{height:4px;border-radius:2px;background:var(--fill);overflow:hidden;margin:10px 0 4px}
.progress>i{display:block;height:100%;background:var(--blue);border-radius:2px;transition:width .3s}
.empty{text-align:center;padding:30px 16px;color:var(--muted)}
.empty .icon{width:40px;height:40px;color:var(--faint);margin-bottom:8px}
.empty h3{color:var(--text)}
.empty p{font-size:15px}
.footnote{font-size:13px;color:var(--muted);margin:10px 4px 18px;line-height:1.5}
.saving{font-size:12px}
.offline{color:var(--orange-text);margin:0 0 12px}
.pill{display:inline-flex;align-items:center;gap:5px;border-radius:999px;padding:5px 11px;font-size:13px;font-weight:600;background:var(--fill);color:var(--text);white-space:nowrap}

/* ---------- 模擬考 ---------- */
.resume{display:flex;align-items:center;gap:12px}
.resume .primary{flex:none;min-height:36px;padding:6px 16px;font-size:15px;border-radius:999px}
.score-sm{font-family:var(--font-display);font-size:22px;font-weight:700;color:var(--text)}
.historybtn .ldetail{font-size:13px}

/* ---------- 作答頁 ---------- */
.qhead{display:flex;justify-content:space-between;align-items:center;gap:10px;padding-top:env(safe-area-inset-top)}
.qhead>div{min-width:0;display:flex;flex-direction:column}
.qhead button{padding:8px 0;font-weight:400;display:inline-flex;align-items:center;gap:2px;align-self:flex-start;min-height:44px}
.qhead button .icon{width:24px;height:24px;stroke-width:2.2}
.qhead .muted{font-size:13px;margin:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.qhead .pill{font-size:15px;font-variant-numeric:tabular-nums}
.timer{color:var(--blue);font-weight:600;font-variant-numeric:tabular-nums}
.question{font-size:19px;line-height:1.65;white-space:pre-wrap;overflow-wrap:anywhere;margin:12px 0 16px;font-weight:500}
.rowtop{display:flex;justify-content:space-between;gap:12px;align-items:center}
.eyebrow{font-size:13px;color:var(--muted);font-weight:500}
.option{position:relative;display:flex;gap:12px;align-items:flex-start;width:100%;text-align:left;padding:13px 14px;margin:0 0 8px;border-radius:12px;background:var(--card2);color:var(--text);font-size:17px;line-height:1.5;font-weight:400;white-space:pre-wrap;overflow-wrap:anywhere;border:1.5px solid transparent;transition:background .12s,border-color .12s}
:root:not([data-theme=dark]) .card .option{background:var(--bg)}
@media(prefers-color-scheme:dark){:root:not([data-theme=light]) .card .option{background:var(--card2)}}
.option .letter{width:26px;height:26px;flex:none;border-radius:50%;display:grid;place-items:center;font-size:14px;font-weight:600;background:var(--card);color:var(--muted);margin-top:0}
.otext{flex:1;min-width:0}
.option.selected{background:var(--tint)!important;border-color:var(--blue)}
.option.selected .letter{background:var(--blue);color:#fff}
.option.correct{background:color-mix(in srgb,var(--green) 14%,var(--card))!important;border-color:var(--green)}
.option.correct .letter{background:var(--green);color:#fff}
.option.incorrect{background:color-mix(in srgb,var(--red) 12%,var(--card))!important;border-color:var(--red)}
.option.incorrect .letter{background:var(--red);color:#fff}
.option:disabled{opacity:1}
.option:disabled:not(.correct):not(.incorrect){opacity:.55}
.omark{font-weight:700;font-size:17px;flex:none}
.omark.ok{color:var(--green-text)}.omark.bad{color:var(--red-text)}
.answerfeedback{padding:14px 16px;border-radius:12px;background:color-mix(in srgb,var(--green) 12%,transparent);color:var(--green-text);margin-top:12px}
.answerfeedback.wrong{background:color-mix(in srgb,var(--red) 10%,transparent);color:var(--red-text)}
.answerfeedback p{font-size:15px;color:var(--muted);margin:4px 0 0}
.qtools{display:flex;gap:4px;flex-wrap:wrap;margin:6px -8px 0}
.qtools button{font-size:15px;font-weight:500;padding:8px 10px;display:inline-flex;align-items:center;gap:5px}
.qtools button.secondary{background:var(--tint)}
.qtools .icon{width:19px;height:19px}
.qfooter{display:flex;gap:10px;margin-top:14px;align-items:center}
.qfooter .primary{flex:1;min-height:50px;border-radius:14px}
.qfooter .secondary{min-height:50px;border-radius:14px}
.answergrid{display:grid;grid-template-columns:repeat(10,1fr);gap:6px;margin:12px 0 4px}
.answergrid button{min-height:40px;padding:0;border-radius:10px;background:var(--fill);color:var(--text);font-size:14px;font-weight:500;font-variant-numeric:tabular-nums}
.answergrid button.answered{background:var(--blue);color:#fff}
.answergrid button.flagged{box-shadow:inset 0 0 0 2px var(--orange)}
.answergrid button.current{outline:2px solid var(--text);outline-offset:1px}
details.card summary{cursor:pointer;font-weight:600;list-style:none;display:flex;align-items:center;justify-content:space-between;min-height:30px;line-height:1.5}
details.card summary::-webkit-details-marker{display:none}
details.card summary::after{content:"";width:8px;height:8px;border-right:2px solid var(--faint);border-bottom:2px solid var(--faint);transform:rotate(45deg);margin:0 4px 4px 12px;flex:none;transition:transform .2s}
details[open].card summary::after{transform:rotate(225deg);margin-bottom:-4px}
details p{font-size:15px}
.raw{white-space:pre-wrap;overflow-wrap:anywhere;font-size:15px;line-height:1.7;margin:8px 0}
.status-review{color:var(--orange-text)}
.status-mastered{color:var(--green-text)}
.status-learning{color:var(--blue)}
.status-new{color:var(--muted)}
.danger{color:var(--red-text)}

/* ---------- 成績、統計 ---------- */
.score{font-family:var(--font-display);font-size:64px;font-weight:700;letter-spacing:-1.5px;color:var(--text);margin:6px 0;font-variant-numeric:tabular-nums}
.score small{font-size:22px;letter-spacing:0;color:var(--muted)}
.row{padding:12px 0;border-bottom:.5px solid var(--line)}
.row:last-child{border-bottom:0}
.row p{margin:0 0 4px}
.rowmeta{display:flex;justify-content:space-between;font-size:13px;color:var(--muted);gap:8px}
.chart{width:100%;height:auto;max-height:200px;overflow:visible;display:block}
.chart text{fill:var(--muted);font-size:16px;font-variant-numeric:tabular-nums}
.chart rect{fill:var(--blue)}
.chart line.grid{stroke-dasharray:4 4}
.chart line{stroke:var(--line)}
.chart polyline{fill:none;stroke:var(--blue);stroke-width:2.5;stroke-linejoin:round;stroke-linecap:round}
.scrolltable{overflow-x:auto;margin:0 -16px;padding:0 16px}
table{width:100%;border-collapse:collapse;font-size:15px;font-variant-numeric:tabular-nums}
td,th{text-align:left;padding:10px 8px;border-bottom:.5px solid var(--line);line-height:1.4;white-space:nowrap}
td:first-child{white-space:normal;min-width:9em}
th{font-weight:400;font-size:13px;color:var(--muted)}
tr:last-child td{border-bottom:0}
.card>h2{font-size:17px;margin-bottom:10px}
.historybtn{display:flex;justify-content:space-between;align-items:center;width:100%;text-align:left;color:var(--text)}
.rules{margin:0;padding-left:20px;line-height:1.6;font-size:15px}
.rules li{margin:6px 0}
.backuptext{width:100%;min-height:160px;margin:12px 0;padding:12px;border:0;border-radius:10px;background:var(--fill);color:var(--text);font:13px/1.5 ui-monospace,Menlo,monospace;word-break:break-all;resize:vertical}
.pastebox{margin-top:12px}
.pastebox summary{cursor:pointer;color:var(--blue);min-height:44px;display:flex;align-items:center}
.pastebox textarea{font-size:16px}
.allbank{margin:0}

/* ---------- 分頁列 ---------- */
nav{position:fixed;left:0;right:0;bottom:0;z-index:20;display:flex;justify-content:center;padding:4px max(8px,env(safe-area-inset-right)) env(safe-area-inset-bottom) max(8px,env(safe-area-inset-left));background:var(--bar);-webkit-backdrop-filter:saturate(180%) blur(20px);backdrop-filter:saturate(180%) blur(20px);border-top:.5px solid var(--line)}
nav button{flex:1;max-width:120px;min-height:49px;padding:4px 0 2px;border-radius:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;font-size:10px;font-weight:500;color:var(--faint);letter-spacing:.1px}
:root:not([data-theme=dark]) nav button{color:#8e8e93}
nav button.active{color:var(--blue)}
nav .icon{width:26px;height:26px;stroke-width:1.9}
nav button.active .icon{stroke-width:2.3}

/* ---------- 提示框（iOS alert）與通知 ---------- */
.modalback{position:fixed;inset:0;z-index:40;display:grid;place-items:center;padding:24px;background:rgba(0,0,0,.35);animation:fade .15s ease-out}
.modal{width:min(300px,100%);max-height:80vh;overflow:auto;background:var(--bar);-webkit-backdrop-filter:saturate(180%) blur(30px);backdrop-filter:saturate(180%) blur(30px);border-radius:14px;text-align:center;box-shadow:var(--shadow-alert);animation:pop .2s ease-out}
.modal h2{font-size:17px;font-weight:600;margin:20px 16px 4px;font-family:var(--font)}
.modal p{font-size:13px;line-height:1.45;margin:0 16px 18px;color:var(--text)}
.modal .actions{display:flex;border-top:.5px solid var(--line)}
.modal .actions button{flex:1;border-radius:0;min-height:44px;background:none;color:var(--blue);font-weight:400}
.modal .actions button+button{border-left:.5px solid var(--line);font-weight:600}
@keyframes pop{from{transform:scale(1.12);opacity:0}to{transform:none;opacity:1}}
@keyframes fade{from{opacity:0}}
#toast{position:fixed;left:50%;bottom:calc(72px + env(safe-area-inset-bottom));transform:translateX(-50%);z-index:50;display:none;width:max-content;max-width:min(92vw,520px);padding:12px 18px;border-radius:14px;background:var(--bar);color:var(--text);-webkit-backdrop-filter:saturate(180%) blur(20px);backdrop-filter:saturate(180%) blur(20px);box-shadow:0 6px 24px rgba(0,0,0,.18);font-size:15px;line-height:1.45;text-align:center}
body:has(main.focus) #toast{bottom:calc(96px + env(safe-area-inset-bottom))}

/* ---------- 專注作答模式（練習與考試） ---------- */
main.focus{padding-bottom:calc(24px + env(safe-area-inset-bottom))}
main.focus .topbar{display:none}
main.focus .qhead{position:sticky;top:0;z-index:6;background:var(--bg);margin:0 calc(-1*max(20px,env(safe-area-inset-left)));padding:env(safe-area-inset-top) max(20px,env(safe-area-inset-right)) 4px max(12px,env(safe-area-inset-left))}
main.focus .progress{margin:0 0 12px}
main.focus .card{padding:16px;overflow:visible}
main.focus .qfooter{position:sticky;bottom:0;z-index:5;margin:14px -16px -16px;border-radius:0 0 var(--r-card) var(--r-card);padding:10px 16px calc(10px + env(safe-area-inset-bottom));background:var(--bar);-webkit-backdrop-filter:saturate(180%) blur(20px);backdrop-filter:saturate(180%) blur(20px);border-top:.5px solid var(--line)}

/* ---------- 寬螢幕 ---------- */
@media(min-width:700px){
 .columns{display:grid;grid-template-columns:1fr 1fr;gap:20px}
 .heading{padding-top:16px}
}
@media(max-width:650px){
 main{padding-left:max(16px,env(safe-area-inset-left));padding-right:max(16px,env(safe-area-inset-right))}
 .topbar{margin-left:calc(-1*max(16px,env(safe-area-inset-left)));margin-right:calc(-1*max(16px,env(safe-area-inset-right)));padding-left:max(16px,env(safe-area-inset-left))}
 main.focus .qhead{margin-left:calc(-1*max(16px,env(safe-area-inset-left)));margin-right:calc(-1*max(16px,env(safe-area-inset-right)));padding-right:max(16px,env(safe-area-inset-right))}
 .metrics{grid-template-columns:repeat(2,1fr)}
 .twocol{grid-template-columns:1fr}
 .answergrid{grid-template-columns:repeat(6,1fr)}
 .answergrid button{min-height:44px}
 .filters{flex-wrap:wrap}
 .filters>select:first-child{flex-basis:100%}
}
@media(max-width:360px){
 h1{font-size:30px}
 .rings{width:108px;height:108px}
 .ringstats strong{font-size:26px}
 .question{font-size:17px}
 .option{font-size:16px;padding:11px 12px}
 .seg span{font-size:13px;padding:4px 3px}
 main.focus .qfooter button{font-size:15px;padding:8px}
}
@media(prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}

.kv{background:var(--card2);margin:4px 0 8px}
:root:not([data-theme=dark]) .kv{background:var(--bg)}
.kv .lrow{background:transparent;min-height:40px;padding:8px 12px}
.kv .ltitle{font-size:15px;flex:none;white-space:nowrap}
.kv .ldetail{font-size:15px;white-space:normal;text-align:right;flex:1;min-width:0}