/* ACI 工程管理教學網 — 線上測驗（沿用主站工程圖視覺） */
:root{
  --bg:#F3F5F4; --paper:#fff; --ink:#182530; --ink2:#46535e; --blue:#1D4E6B; --blue2:#2b6a8f; --yellow:#F2A007;
  --line:#d5dcdf; --grid:rgba(29,78,107,.07);
  --ok:#1f7a4d; --ok-bg:#e7f4ec; --bad:#b3261e; --bad-bg:#fbeceb;
  --mono:"IBM Plex Mono",ui-monospace,Menlo,Consolas,monospace;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;font-family:"Noto Sans TC",system-ui,-apple-system,"PingFang TC","Microsoft JhengHei",sans-serif;color:var(--ink);line-height:1.8;font-size:16px;
  background-color:var(--bg);
  background-image:linear-gradient(var(--grid) 1px,transparent 1px),linear-gradient(90deg,var(--grid) 1px,transparent 1px);
  background-size:24px 24px;min-height:100vh;display:flex;flex-direction:column}
main{flex:1;outline:none;min-width:0;width:100%}
img{max-width:100%;height:auto;display:block}
a{color:var(--blue)}
a:hover{color:var(--blue2)}
button,input,select{font:inherit;color:inherit}
.mono{font-family:var(--mono);letter-spacing:.04em}
.wrap{max-width:1160px;margin:0 auto;padding:0 20px}
.skip{position:absolute;left:-999px}.skip:focus{left:12px;top:12px;z-index:999;background:#fff;padding:8px 12px}
.boot{padding:80px 20px;text-align:center;color:var(--ink2)}
[hidden]{display:none!important}

/* header (同主站) */
.site-header{position:sticky;top:0;z-index:50;background:rgba(24,37,48,.97);color:#fff;border-bottom:3px solid var(--yellow)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:68px;gap:20px}
.brand{display:flex;align-items:center;gap:12px;color:#fff;text-decoration:none}
.brand:hover{color:#fff}
.mark{display:inline-grid;place-items:center;font-family:var(--mono);font-weight:600;font-size:15px;letter-spacing:.06em;background:var(--blue);color:#fff;border:2px solid #fff;padding:4px 8px;line-height:1.2;box-shadow:3px 3px 0 var(--yellow)}
.brand-text{display:flex;flex-direction:column;line-height:1.25}
.brand-text b{font-size:17px;font-weight:700;letter-spacing:.06em}
.brand-text small{font-family:var(--mono);font-size:10.5px;color:#9fb3c1;letter-spacing:.06em}
.menu{list-style:none;margin:0;padding:0;display:flex;gap:4px;align-items:center}
.menu a{display:block;padding:8px 12px;color:#dfe7ec;text-decoration:none;font-size:15px;font-weight:500;border-bottom:2px solid transparent}
.menu a:hover{color:#fff;border-bottom-color:rgba(242,160,7,.6)}
.menu a[aria-current]{color:#fff;border-bottom-color:var(--yellow)}
.user-link{display:flex!important;align-items:center;gap:6px;margin-left:8px;border:1px solid rgba(255,255,255,.3)!important;padding:5px 12px!important}
.user-link::before{content:"";width:8px;height:8px;background:var(--yellow);transform:rotate(45deg)}
.nav-toggle{display:none;background:none;border:0;padding:8px;cursor:pointer}
.nav-toggle span{display:block;width:24px;height:2px;background:#fff;margin:5px 0;transition:.2s}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:10px 20px;border:2px solid var(--ink);color:var(--ink);background:var(--paper);text-decoration:none;font-weight:700;font-size:15px;transition:.15s;cursor:pointer;line-height:1.4;min-height:44px}
.btn:hover{background:var(--ink);color:#fff}
.btn:disabled{opacity:.45;cursor:not-allowed;background:var(--paper);color:var(--ink)}
.btn-primary{background:var(--blue);border-color:var(--blue);color:#fff;box-shadow:4px 4px 0 var(--yellow)}
.btn-primary:hover{background:var(--ink);border-color:var(--ink);color:#fff}
.btn-primary:disabled{background:var(--blue);color:#fff}
.btn-yellow{background:var(--yellow);border-color:var(--yellow);color:var(--ink)}
.btn-yellow:hover{background:var(--ink);border-color:var(--ink);color:#fff}
.btn-sm{padding:5px 12px;font-size:14px;min-height:34px;border-width:1px}
.btn-link{background:none;border:0;padding:0;color:var(--blue);font-weight:700;cursor:pointer;text-decoration:underline;min-height:0}
.btn-row{display:flex;flex-wrap:wrap;gap:10px;align-items:center}

/* page head */
.page-head{background:var(--ink);color:#fff;padding:30px 0 34px;border-bottom:3px solid var(--yellow)}
.tb{display:flex;justify-content:space-between;gap:12px;font-size:11.5px;color:#9fb3c1;border-bottom:1px dashed rgba(255,255,255,.25);padding-bottom:8px;margin-bottom:14px;font-family:var(--mono);letter-spacing:.06em}
.page-head h1{margin:0;font-size:clamp(26px,4vw,38px);font-weight:900;letter-spacing:.04em;line-height:1.35}
.page-head .lead{margin:8px 0 0;color:#cdd8df;max-width:46em}
.page-head .crumb{display:inline-block;margin-bottom:6px;color:#f6c35a;text-decoration:none;font-weight:700;font-size:14px}
.page-head .crumb:hover{color:#fff}

section.block{margin-top:40px}
.sec-row{display:flex;justify-content:space-between;align-items:baseline;gap:12px;flex-wrap:wrap;margin-bottom:18px;border-bottom:2px solid var(--ink);padding-bottom:8px}
.sec{font-size:24px;margin:0;font-weight:900;letter-spacing:.04em}
.sec .mono{font-size:14px;background:var(--yellow);color:var(--ink);padding:2px 8px;vertical-align:middle;margin-right:6px}
.muted{color:var(--ink2)}
.small{font-size:14px}

/* landing */
.land{display:grid;grid-template-columns:1.1fr .9fr;gap:40px;align-items:start;padding-top:40px}
.land h2{font-size:clamp(26px,3.4vw,36px);line-height:1.35;margin:0 0 12px;font-weight:900}
.land .eyebrow{font-size:12.5px;color:var(--blue);font-weight:600;margin:0 0 10px;font-family:var(--mono);letter-spacing:.08em}
.feature-list{list-style:none;padding:0;margin:18px 0 24px}
.feature-list li{position:relative;padding-left:28px;margin:10px 0}
.feature-list li::before{content:"";position:absolute;left:4px;top:.6em;width:10px;height:10px;border:2px solid var(--yellow);transform:rotate(45deg)}
.subj-table{width:100%;border-collapse:collapse;background:var(--paper);border:1px solid var(--ink);font-size:15px}
.subj-table caption{text-align:left;background:var(--ink);color:#fff;padding:8px 14px;font-weight:700}
.subj-table th,.subj-table td{border-top:1px solid var(--line);padding:8px 12px;text-align:left}
.subj-table td.num{font-family:var(--mono);text-align:right;color:var(--blue);font-weight:600}
.subj-table thead th{font-size:12.5px;color:var(--ink2);background:#f7f9f9;font-weight:600}

/* auth card */
.auth{background:var(--paper);border:2px solid var(--ink);box-shadow:10px 10px 0 var(--blue)}
.auth-tabs{display:grid;grid-template-columns:1fr 1fr;border-bottom:2px solid var(--ink)}
.auth-tabs button{background:#f1f4f5;border:0;padding:14px;font-weight:900;font-size:16px;cursor:pointer;color:var(--ink2)}
.auth-tabs button[aria-selected="true"]{background:var(--ink);color:#fff}
.auth-body{padding:22px}
.auth-note{font-size:13.5px;color:var(--ink2);margin:0 0 14px}
.field{margin-bottom:14px}
.field>label,.field>.lbl{display:block;font-weight:700;font-size:14.5px;margin-bottom:4px}
.field .hint{font-weight:400;color:var(--ink2);font-size:12.5px;margin-left:4px}
.input{width:100%;padding:10px 12px;border:1px solid #aebbc2;background:#fff;font-size:16px;min-height:44px;border-radius:0}
.input:focus{outline:2px solid var(--yellow);outline-offset:0;border-color:var(--ink)}
.chk{display:flex;gap:8px;align-items:flex-start;font-size:14.5px;margin:6px 0;cursor:pointer;line-height:1.6}
.chk input{margin-top:4px;width:18px;height:18px;flex:none;accent-color:var(--blue)}
.chip-set{display:flex;flex-wrap:wrap;gap:6px}
.chip{position:relative}
.chip input{position:absolute;opacity:0;pointer-events:none}
.chip span{display:inline-block;padding:5px 12px;border:1px solid #aebbc2;background:#fff;font-size:14px;cursor:pointer;user-select:none}
.chip input:checked+span{background:var(--blue);border-color:var(--blue);color:#fff}
.chip input:focus-visible+span{outline:2px solid var(--yellow)}
.form-err{background:var(--bad-bg);color:var(--bad);border-left:4px solid var(--bad);padding:8px 12px;font-size:14.5px;margin-bottom:12px}
.form-ok{background:var(--ok-bg);color:var(--ok);border-left:4px solid var(--ok);padding:8px 12px;font-size:14.5px;margin-bottom:12px}
.pw-wrap{position:relative}
.pw-wrap .input{padding-right:64px}
.pw-toggle{position:absolute;right:6px;top:50%;transform:translateY(-50%);background:none;border:0;color:var(--blue);font-size:13px;font-weight:700;cursor:pointer;padding:6px}

/* notices */
.notice{background:#fff8e6;border-left:4px solid var(--yellow);padding:12px 16px;font-size:15px;margin:20px 0 0;display:flex;gap:12px;align-items:center;justify-content:space-between;flex-wrap:wrap}
.notice.dev{background:#eef5fa;border-left-color:var(--blue);word-break:break-all}

/* dashboard exam cards */
.exam-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:18px}
.exam-card{background:var(--paper);border:1px solid var(--line);border-top:4px solid var(--blue);padding:20px;display:flex;flex-direction:column;gap:10px;color:var(--ink);text-decoration:none;transition:.15s}
.exam-card:hover{transform:translateY(-3px);box-shadow:6px 6px 0 var(--yellow);border-top-color:var(--yellow);color:var(--ink)}
.exam-card.mine{border-top-color:var(--yellow)}
.exam-card .code{font-family:var(--mono);font-size:12px;color:var(--ink2);display:flex;justify-content:space-between}
.exam-card h3{margin:0;font-size:20px;line-height:1.4}
.exam-card h3 .lv{display:inline-block;font-size:13px;background:var(--ink);color:#fff;padding:1px 8px;margin-left:6px;vertical-align:middle}
.bar{height:8px;background:#e6ebed;position:relative;overflow:hidden}
.bar i{position:absolute;left:0;top:0;bottom:0;background:var(--blue)}
.bar i.ok{background:var(--ok)}
.kv{display:flex;gap:16px;flex-wrap:wrap;font-size:13.5px;color:var(--ink2)}
.kv b{font-family:var(--mono);color:var(--ink);font-size:15px}

/* exam home */
.modes{display:grid;grid-template-columns:1.3fr .7fr;gap:22px;align-items:start}
.panel{background:var(--paper);border:1px solid var(--line);padding:22px}
.panel.accent{border-top:4px solid var(--blue)}
.panel.yellow{border-top:4px solid var(--yellow)}
.panel h3{margin:0 0 4px;font-size:20px}
.panel .sub{margin:0 0 14px;color:var(--ink2);font-size:14.5px}
.sec-list{list-style:none;padding:0;margin:0 0 14px;border:1px solid var(--line)}
.sec-list li{border-top:1px solid var(--line)}
.sec-list li:first-child{border-top:0}
.sec-list label{display:grid;grid-template-columns:22px 1fr auto;gap:10px;align-items:center;padding:9px 12px;cursor:pointer}
.sec-list label:hover{background:#f7f9f9}
.sec-list input{width:18px;height:18px;accent-color:var(--blue);margin:0}
.sec-list .nm{font-size:15px;line-height:1.45}
.sec-list .nm small{display:block;color:var(--ink2);font-size:12px}
.sec-list .ct{font-family:var(--mono);font-size:12.5px;color:var(--ink2);text-align:right;white-space:nowrap}
.sec-list .mini{display:block;width:72px;height:4px;background:#e6ebed;margin-top:4px;margin-left:auto;position:relative}
.sec-list .mini i{position:absolute;inset:0 auto 0 0;background:var(--blue)}
.sec-list .all{background:#f7f9f9;font-weight:700}
.opt-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px 18px;margin-bottom:16px}
.seg{display:flex;border:1px solid #aebbc2;background:#fff}
.seg label{flex:1;position:relative}
.seg input{position:absolute;opacity:0}
.seg span{display:block;text-align:center;padding:7px 4px;font-size:14px;cursor:pointer;border-left:1px solid #aebbc2;user-select:none}
.seg label:first-child span{border-left:0}
.seg input:checked+span{background:var(--ink);color:#fff}
.seg input:focus-visible+span{outline:2px solid var(--yellow);outline-offset:-2px}
.mock-spec{display:grid;grid-template-columns:1fr 1fr;border:1px solid var(--ink);margin:12px 0 16px}
.mock-spec div{padding:10px 12px;border-right:1px solid var(--ink);border-bottom:1px solid var(--ink)}
.mock-spec div:nth-child(2n){border-right:0}
.mock-spec div:nth-last-child(-n+2){border-bottom:0}
.mock-spec span{display:block;font-size:11.5px;color:var(--ink2)}
.mock-spec b{font-size:22px;font-weight:900;color:var(--blue);font-family:var(--mono)}
.side-stack{display:flex;flex-direction:column;gap:22px}

/* history table */
.tbl-wrap{overflow-x:auto;background:var(--paper);border:1px solid var(--ink)}
.tbl{width:100%;border-collapse:collapse;font-size:14.5px;min-width:520px}
.tbl th,.tbl td{border-top:1px solid var(--line);padding:8px 12px;text-align:left;white-space:nowrap}
.tbl thead th{background:var(--ink);color:#fff;font-weight:600;font-size:13px;border-top:0}
.tbl td.num{font-family:var(--mono);text-align:right}
.pass{color:var(--ok);font-weight:700}.fail{color:var(--bad);font-weight:700}
.empty{padding:28px;text-align:center;color:var(--ink2);background:var(--paper);border:1px dashed var(--line)}

/* quiz runner */
.qbar{position:sticky;top:71px;z-index:30;background:var(--paper);border-bottom:2px solid var(--ink)}
.qbar .wrap{display:flex;align-items:center;gap:14px;min-height:56px;flex-wrap:wrap;padding-top:6px;padding-bottom:6px}
.qbar .title{font-weight:900;font-size:15.5px;line-height:1.35;flex:1;min-width:0}
.qbar .title small{display:block;font-weight:500;color:var(--ink2);font-size:12.5px}
.qbar .count{font-family:var(--mono);font-weight:600;font-size:15px}
.timer{font-family:var(--mono);font-weight:600;font-size:17px;background:var(--ink);color:#fff;padding:4px 10px;letter-spacing:.06em}
.timer.warn{background:var(--bad)}
.qprog{height:4px;background:#e6ebed}
.qprog i{display:block;height:100%;background:var(--yellow);transition:width .25s}
.quiz-layout{display:grid;grid-template-columns:1fr 250px;gap:22px;padding-top:22px;align-items:start}
.quiz-layout.solo{grid-template-columns:minmax(0,860px);justify-content:center}
.qcard{background:var(--paper);border:1px solid var(--ink);position:relative;min-width:0}
.qcard::before,.qcard::after{content:"";position:absolute;width:12px;height:12px;border-color:var(--yellow);border-style:solid}
.qcard::before{top:-5px;left:-5px;border-width:3px 0 0 3px}
.qcard::after{bottom:-5px;right:-5px;border-width:0 3px 3px 0}
.qhead{display:flex;flex-wrap:wrap;gap:8px;align-items:center;padding:10px 16px;border-bottom:1px solid var(--line);background:#f7f9f9;font-size:13px}
.tag{font-family:var(--mono);font-weight:600;font-size:12px;padding:2px 8px;background:var(--ink);color:#fff;letter-spacing:.04em}
.tag.multi{background:var(--yellow);color:var(--ink)}
.tag.common{background:var(--blue)}
.qhead .src{color:var(--ink2)}
.qhead .qno{margin-left:auto;font-family:var(--mono);color:var(--ink2)}
.qbody{padding:20px 20px 8px}
.qnum{font-family:var(--mono);font-weight:600;color:var(--blue);font-size:15px;margin-right:6px}
.stem{font-size:18px;line-height:1.85;margin:0 0 14px;overflow-wrap:anywhere}
.blank{display:inline-block;min-width:3.2em;border-bottom:2px solid var(--ink);margin:0 4px;vertical-align:baseline;height:1.1em}
.qfig{margin:0 0 16px}
.qfig figcaption{font-size:12px;color:var(--ink2);margin-top:2px}
.qimg{margin:0;background:#fff;border:1px solid var(--line);padding:8px;cursor:zoom-in;display:inline-block;max-width:100%}
.qimg img{max-width:100%}
.multi-hint{font-size:13.5px;color:#8a5a00;background:#fff4dc;padding:4px 10px;display:inline-block;margin-bottom:12px}
.opts{list-style:none;padding:0;margin:0 0 14px;display:flex;flex-direction:column;gap:10px}
.opt{display:grid;grid-template-columns:40px 1fr 28px;align-items:center;gap:10px;width:100%;text-align:left;background:#fff;border:1.5px solid #aebbc2;padding:10px 12px;cursor:pointer;font-size:16.5px;line-height:1.6;min-height:52px;transition:border-color .12s,background .12s}
.opt:hover:not(:disabled){border-color:var(--ink);background:#fafbfb}
.opt:focus-visible{outline:3px solid var(--yellow);outline-offset:1px}
.opt .lab{display:inline-grid;place-items:center;width:32px;height:32px;border:1.5px solid var(--ink);font-family:var(--mono);font-weight:600;font-size:15px;background:#fff}
.opt.multi .lab{border-radius:0}
.opt.sel{border-color:var(--blue);background:#eaf2f7}
.opt.sel .lab{background:var(--blue);color:#fff;border-color:var(--blue)}
.opt .mk{font-weight:900;font-size:18px;text-align:center}
.opt.right{border-color:var(--ok);background:var(--ok-bg)}
.opt.right .lab{background:var(--ok);border-color:var(--ok);color:#fff}
.opt.right .mk{color:var(--ok)}
.opt.wrong{border-color:var(--bad);background:var(--bad-bg)}
.opt.wrong .lab{background:var(--bad);border-color:var(--bad);color:#fff}
.opt.wrong .mk{color:var(--bad)}
.opt.missed{border-style:dashed;border-color:var(--ok)}
.opt:disabled{cursor:default;color:var(--ink)}
.qfoot{display:flex;gap:10px;flex-wrap:wrap;align-items:center;justify-content:space-between;padding:12px 20px 18px;border-top:1px dashed var(--line)}
.verdict{font-weight:900;font-size:16px;display:flex;align-items:center;gap:8px}
.verdict.ok{color:var(--ok)}.verdict.no{color:var(--bad)}
.verdict small{font-weight:500;color:var(--ink2);font-size:14px}
.qfoot .spacer{flex:1}
.flag-btn.on{background:var(--yellow);border-color:var(--yellow)}
.kbd-hint{font-size:12px;color:var(--ink2);margin-top:8px;text-align:right}

/* navigator */
.navi{background:var(--paper);border:1px solid var(--line);padding:14px;position:sticky;top:150px}
.navi h4{margin:0 0 8px;font-size:14px;display:flex;justify-content:space-between}
.navi-grid{display:grid;grid-template-columns:repeat(8,1fr);gap:4px;max-height:52vh;overflow:auto}
.navi-grid button{aspect-ratio:1;border:1px solid #c5cfd4;background:#fff;font-family:var(--mono);font-size:11.5px;cursor:pointer;padding:0;position:relative}
.navi-grid button.ans{background:var(--blue);border-color:var(--blue);color:#fff}
.navi-grid button.cur{outline:2px solid var(--yellow);outline-offset:1px}
.navi-grid button.flag::after{content:"";position:absolute;right:1px;top:1px;width:0;height:0;border-left:6px solid transparent;border-top:6px solid var(--yellow)}
.navi-grid button.r{background:var(--ok-bg);border-color:var(--ok);color:var(--ok)}
.navi-grid button.w{background:var(--bad-bg);border-color:var(--bad);color:var(--bad)}
.navi-sep{grid-column:1/-1;font-size:11px;color:var(--ink2);margin-top:4px}
.navi .legend{display:flex;gap:10px;flex-wrap:wrap;font-size:11.5px;color:var(--ink2);margin-top:10px}
.navi .legend i{display:inline-block;width:10px;height:10px;margin-right:4px;vertical-align:-1px;border:1px solid #c5cfd4}
.navi-toggle{display:none}

/* result */
.score-sheet{display:grid;grid-template-columns:repeat(4,1fr);border:2px solid var(--ink);background:var(--paper);box-shadow:8px 8px 0 var(--blue)}
.score-sheet>div{padding:16px 18px;border-right:1px solid var(--ink)}
.score-sheet>div:last-child{border-right:0}
.score-sheet span{display:block;font-size:12px;color:var(--ink2)}
.score-sheet b{font-size:34px;font-weight:900;color:var(--blue);line-height:1.2;font-family:var(--mono)}
.score-sheet .big b{font-size:50px}
.score-sheet .verdict-cell{background:repeating-linear-gradient(135deg,transparent 0 10px,rgba(242,160,7,.1) 10px 20px)}
.stamp{display:inline-block;border:3px solid currentColor;padding:2px 12px;font-size:22px;font-weight:900;transform:rotate(-4deg);margin-top:4px}
.stamp.pass{color:var(--ok)}.stamp.fail{color:var(--bad)}
.breakdown{width:100%;border-collapse:collapse;background:var(--paper);border:1px solid var(--line);font-size:14.5px}
.breakdown th,.breakdown td{padding:8px 12px;border-top:1px solid var(--line);text-align:left}
.breakdown td.num{font-family:var(--mono);text-align:right;white-space:nowrap}
.breakdown .bar{width:120px;display:inline-block;vertical-align:middle}
.review-item{background:var(--paper);border:1px solid var(--line);border-left:4px solid var(--bad);padding:14px 16px;margin-bottom:12px}
.review-item.ok{border-left-color:var(--ok)}
.review-item .meta{font-size:12.5px;color:var(--ink2);font-family:var(--mono);margin-bottom:4px;display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.review-item .q{margin:0 0 6px}
.review-item ol{margin:6px 0;padding-left:0;list-style:none}
.review-item li{padding:2px 0 2px 2px;font-size:15px}
.review-item li.c{color:var(--ok);font-weight:700}
.review-item li.u{color:var(--bad);text-decoration:line-through}
.review-item li.c.u{text-decoration:none}
.review-item .ans{font-size:14px;margin-top:6px}
.review-item .qimg{max-width:560px}
.filters{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:14px}

/* account */
.acc-grid{display:grid;grid-template-columns:1fr 1fr;gap:22px;align-items:start}

/* modal / toast / lightbox */
.modal{position:fixed;inset:0;z-index:300;background:rgba(10,16,22,.6);display:flex;align-items:center;justify-content:center;padding:16px}
.modal-box{background:var(--paper);border:2px solid var(--ink);box-shadow:8px 8px 0 var(--yellow);max-width:440px;width:100%;padding:22px}
.modal-box h3{margin:0 0 8px;font-size:19px}
.modal-body{color:var(--ink2);font-size:15px;margin-bottom:18px}
.modal-actions{display:flex;gap:10px;justify-content:flex-end;flex-wrap:wrap}
.toast{position:fixed;left:50%;bottom:24px;transform:translateX(-50%);z-index:400;background:var(--ink);color:#fff;padding:10px 18px;font-size:15px;border-left:4px solid var(--yellow);max-width:calc(100% - 32px)}
.lightbox{position:fixed;inset:0;z-index:250;background:rgba(10,16,22,.94);display:flex;align-items:center;justify-content:center;padding:12px}
.lightbox img{max-width:96vw;max-height:90vh;width:auto;background:#fff;padding:8px}
.lightbox button{position:absolute;top:8px;right:12px;background:none;border:0;color:#fff;font-size:44px;cursor:pointer;line-height:1}
.prose{max-width:820px}
.prose h2{font-size:21px;margin:28px 0 8px;border-bottom:2px solid var(--ink);padding-bottom:4px}

/* footer (同主站) */
.site-footer{margin-top:64px;background:var(--ink);color:#b9c7d1;font-size:14.5px;border-top:3px solid var(--yellow)}
.footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr;gap:32px;padding-top:36px;padding-bottom:24px}
.site-footer h4{color:#fff;margin:0 0 8px;font-size:15px}
.site-footer a{color:#e6edf2;text-decoration:none}
.site-footer a:hover{color:var(--yellow)}
.f-brand{color:#fff;font-weight:700;font-size:16px;margin:0 0 8px}
.f-brand .mark{font-size:12px;box-shadow:2px 2px 0 var(--yellow)}
.copy{display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px;border-top:1px solid rgba(255,255,255,.12);padding-top:14px;padding-bottom:20px;font-size:12.5px;color:#8ea2b0}
body.in-quiz .site-footer{margin-top:40px}

/* responsive */
@media (max-width:980px){
  .land{grid-template-columns:1fr;gap:28px;padding-top:24px}
  .land .auth{order:-1}
  .modes{grid-template-columns:1fr}
  .quiz-layout{grid-template-columns:1fr}
  .navi{position:static;order:2}
  .acc-grid{grid-template-columns:1fr}
  .score-sheet{grid-template-columns:1fr 1fr}
  .score-sheet>div:nth-child(2){border-right:0}
  .score-sheet>div:nth-child(-n+2){border-bottom:1px solid var(--ink)}
}
@media (max-width:860px){
  .nav-toggle{display:block}
  .site-nav{display:none;position:absolute;top:71px;left:0;right:0;background:var(--ink);border-bottom:3px solid var(--yellow)}
  body.nav-open .site-nav{display:block}
  .menu{flex-direction:column;align-items:stretch;padding:8px 20px 16px}
  .menu a{padding:12px 4px;border-bottom:1px solid rgba(255,255,255,.1)}
  .menu a[aria-current]{border-bottom-color:var(--yellow);color:var(--yellow)}
  .user-link{margin:8px 0 0}
  body.nav-open .nav-toggle span:nth-child(1){transform:translateY(7px) rotate(45deg)}
  body.nav-open .nav-toggle span:nth-child(2){opacity:0}
  body.nav-open .nav-toggle span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
  .footer-grid{grid-template-columns:1fr;gap:18px}
}
@media (max-width:560px){
  .wrap{padding:0 16px}
  .brand-text small{display:none}
  .header-inner{height:60px}
  .site-nav{top:63px}
  .qbar{top:63px}
  .page-head{padding:22px 0 26px}
  .auth{box-shadow:6px 6px 0 var(--blue)}
  .auth-body{padding:18px 16px}
  .opt-grid{grid-template-columns:1fr}
  .panel{padding:18px 16px}
  .qbody{padding:16px 14px 4px}
  .stem{font-size:17px}
  .opt{grid-template-columns:34px 1fr 22px;font-size:16px;padding:9px 10px;gap:8px}
  .opt .lab{width:28px;height:28px;font-size:14px}
  .qfoot{padding:10px 14px 14px}
  .qfoot .btn{flex:1;padding:8px 10px;white-space:nowrap}
  .qfoot .spacer{display:none}
  .verdict{width:100%}
  .navi-grid{grid-template-columns:repeat(8,1fr)}
  .score-sheet b{font-size:26px}
  .score-sheet .big b{font-size:38px}
  .breakdown .bar{width:60px}
  .exam-grid{grid-template-columns:1fr}
  .kbd-hint{display:none}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important}}

/* LINE 群組（會員專屬） */
.line-box{display:flex;gap:22px;align-items:center;background:var(--paper);border:1px solid var(--line);border-left:6px solid #06c755;padding:20px}
.line-box h3{margin:0 0 4px;font-size:19px}
.line-box p{margin:0 0 4px}
.line-qr{flex:none;background:#fff;border:1px solid var(--line);padding:6px;cursor:zoom-in}
.line-qr img{width:180px;height:auto}
.line-lock-ic{flex:none;width:72px;height:72px;display:grid;place-items:center;font-size:34px;background:#f1f4f5;border:1px dashed #aebbc2}
@media (max-width:560px){.line-box{flex-direction:column;align-items:flex-start}}