/* StudyLab · EJU 综合科目 — mobile-first */
:root{
 --bg:#f6f7fb;--card:#fff;--ink:#1f2433;--ink2:#4b5368;--muted:#8a91a5;--line:#e6e8ef;
 --brand:#2f6fde;--brand-bg:#eaf1ff;
 --pol:#d9465f;--eco:#e08a1e;--soc:#2e9f6b;--geo:#2f86d1;--his:#8a5cd0;
 --key:#c2410c;--key-bg:#fff4e5;--ja:#1d4ed8;--ja-bg:#eef4ff;--concept:#7c3aed;--num:#0f766e;--num-bg:#e6f7f4;--warn:#dc2626;--warn-bg:#fdecec;
 --why:#7c3aed;--quant:#0f766e;--method:#15803d;--traps:#dc2626;--sum:#4338ca;
 --r:14px;--topbar:52px;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.75 -apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans","Noto Sans CJK SC","Microsoft YaHei",sans-serif}
a{color:var(--brand);text-decoration:none}
h1{font-size:1.5rem;line-height:1.35;margin:.2em 0 .2em}
button{font:inherit;cursor:pointer}
/* ---------- topbar ---------- */
.topbar{position:sticky;top:0;z-index:40;height:var(--topbar);display:flex;align-items:center;gap:6px;padding:0 8px;padding-top:env(safe-area-inset-top);background:rgba(255,255,255,.96);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.tb-back{flex:none;display:flex;align-items:center;gap:2px;height:36px;padding:0 10px;border-radius:10px;background:var(--brand-bg);color:var(--brand);font-weight:700;font-size:1rem;white-space:nowrap}
.tb-back span{font-size:.9rem}
.tb-back.home{background:var(--brand);color:#fff;font-size:.85rem}
.crumbs{flex:1;min-width:0;overflow-x:auto;white-space:nowrap;scrollbar-width:none;font-size:.86rem;color:var(--muted)}
.crumbs::-webkit-scrollbar{display:none}
.crumbs a{color:var(--ink2);padding:4px 2px}
.crumbs .sep{margin:0 5px;color:#c0c5d2}
.crumbs .cur{color:var(--ink);font-weight:700}
.tb-btn{flex:none;width:38px;height:36px;border:0;border-radius:10px;background:transparent;color:var(--ink2);font-size:1.25rem;display:flex;align-items:center;justify-content:center}
.tb-btn:active{background:var(--line)}
/* ---------- layout / drawer ---------- */
.app{display:block}
.sidebar{position:fixed;top:0;left:0;bottom:0;width:260px;z-index:60;background:#fff;border-right:1px solid var(--line);overflow-y:auto;padding:16px 12px 24px;transform:translateX(-100%);transition:transform .22s ease}
body.drawer-open .sidebar{transform:none;box-shadow:0 0 40px rgba(0,0,0,.18)}
.mask{position:fixed;inset:0;z-index:50;background:rgba(15,20,35,.35);display:none}
body.drawer-open .mask{display:block}
body.drawer-open{overflow:hidden}
.main-wrap{min-width:0}
.main{max-width:780px;margin:0 auto;padding:16px 14px 80px}
.logo{display:flex;align-items:center;gap:10px;padding:4px 8px 16px}
.logo-mark{width:38px;height:38px;border-radius:11px;background:var(--brand);color:#fff;font-weight:800;display:flex;align-items:center;justify-content:center}
.logo-text strong{display:block;line-height:1.2}.logo-text span{font-size:.78rem;color:var(--muted)}
.nav-item{display:flex;align-items:center;gap:10px;padding:9px 10px;border-radius:10px;color:var(--ink2);font-size:.95rem}
.nav-item:hover{background:var(--bg)}
.nav-item.active{background:var(--brand-bg);color:var(--brand);font-weight:700}
.nav-item.muted{color:#b3b8c6}
.icon{width:24px;text-align:center}
.sicon{font-weight:800;border-radius:7px;color:#fff;font-size:.8rem;height:24px;line-height:24px}
.nav-item.subj-pol .sicon{background:var(--pol)}.nav-item.subj-eco .sicon{background:var(--eco)}.nav-item.subj-soc .sicon{background:var(--soc)}.nav-item.subj-geo .sicon{background:var(--geo)}.nav-item.subj-his .sicon{background:var(--his)}
.nav-group-label{margin:16px 10px 4px;font-size:.75rem;color:var(--muted);letter-spacing:.08em}
.sidebar-footer{margin:24px 10px 0;font-size:.75rem;color:var(--muted)}
@media (min-width:960px){
 .sidebar{transform:none;box-shadow:none}
 .main-wrap{margin-left:260px}
 .topbar{margin-left:260px}
 .tb-btn.menu{display:none}
 .mask{display:none!important}
 body.drawer-open{overflow:auto}
 .main{padding:24px 28px 80px}
 h1{font-size:1.75rem}
}
/* ---------- common bits ---------- */
.loading,.hint{color:var(--muted)}
.subtitle{color:var(--ink2);margin:0 0 16px}
.eyebrow{margin:0;font-size:.8rem;font-weight:700;letter-spacing:.04em;color:var(--brand)}
.subj-pol.eyebrow,.r-meta.subj-pol,.qz-from.subj-pol{color:var(--pol)}.subj-eco.eyebrow,.r-meta.subj-eco,.qz-from.subj-eco{color:var(--eco)}.subj-soc.eyebrow,.r-meta.subj-soc,.qz-from.subj-soc{color:var(--soc)}.subj-geo.eyebrow,.r-meta.subj-geo,.qz-from.subj-geo{color:var(--geo)}.subj-his.eyebrow,.r-meta.subj-his,.qz-from.subj-his{color:var(--his)}
.list-h{font-size:1.05rem;margin:22px 0 10px}
.go{color:#b5bbca;font-size:1.3rem;margin-left:auto;flex:none}
.home-title small{font-size:.9rem;color:var(--muted);font-weight:500;margin-left:6px}
.search-box{display:flex;gap:8px;margin:12px 0 16px}
.search-box input{flex:1;min-width:0;height:46px;border:1.5px solid var(--line);border-radius:12px;padding:0 14px;font-size:16px;background:#fff}
.search-box input:focus{outline:none;border-color:var(--brand)}
.search-box button{height:46px;padding:0 18px;border:0;border-radius:12px;background:var(--brand);color:#fff;font-weight:700}
.continue-banner{display:flex;justify-content:space-between;align-items:center;gap:10px;padding:12px 16px;border-radius:var(--r);background:linear-gradient(90deg,#2f6fde,#5b8ff0);color:#fff;margin-bottom:12px;font-size:.92rem}
.continue-banner b{margin-left:6px}
.past-entry{display:flex;align-items:center;gap:12px;padding:14px 16px;border-radius:var(--r);background:#fff7ec;border:1.5px solid #fbd7a5;color:var(--ink)}
.past-entry .pe-ic{width:40px;height:40px;border-radius:12px;background:var(--eco);color:#fff;display:flex;align-items:center;justify-content:center;font-size:1.2rem;flex:none}
.past-entry b{display:block}.past-entry small{color:var(--ink2)}
.past-entry.slim{margin-top:16px;padding:10px 14px}.past-entry.slim .pe-ic{width:32px;height:32px;font-size:1rem}
.subj-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px}
@media (min-width:640px){.subj-grid{grid-template-columns:repeat(3,1fr)}}
.subj-tile{position:relative;display:flex;flex-direction:column;gap:2px;padding:14px;border-radius:var(--r);background:#fff;border:1px solid var(--line);color:var(--ink);overflow:hidden}
.subj-tile:active{transform:scale(.98)}
.st-ic{width:36px;height:36px;border-radius:10px;color:#fff;font-weight:800;display:flex;align-items:center;justify-content:center;margin-bottom:6px}
.st-name{font-weight:800;font-size:1.05rem}.st-meta{font-size:.8rem;color:var(--muted)}
.st-bar{height:4px;background:var(--line);border-radius:4px;margin-top:8px;overflow:hidden}.st-bar i{display:block;height:100%}
.subj-pol .st-ic,.subj-pol .st-bar i{background:var(--pol)}.subj-eco .st-ic,.subj-eco .st-bar i{background:var(--eco)}.subj-soc .st-ic,.subj-soc .st-bar i{background:var(--soc)}.subj-geo .st-ic,.subj-geo .st-bar i{background:var(--geo)}.subj-his .st-ic,.subj-his .st-bar i{background:var(--his)}
.progress-card{margin-top:16px;padding:14px 16px;background:#fff;border-radius:var(--r);border:1px solid var(--line)}
.progress-meta{display:flex;justify-content:space-between;font-size:.88rem;color:var(--ink2)}
.progress-bar{height:8px;background:var(--line);border-radius:8px;overflow:hidden;margin-top:6px}.progress-bar span{display:block;height:100%;background:var(--soc)}
/* lists */
.chapter{background:#fff;border:1px solid var(--line);border-radius:var(--r);margin:0 0 14px;overflow:hidden}
.chapter-head{display:flex;align-items:center;gap:10px;padding:13px 14px;background:#fafbfe;border-bottom:1px solid var(--line);color:var(--ink)}
.ch-no{font-size:.75rem;font-weight:700;color:#fff;background:var(--ink2);border-radius:6px;padding:1px 7px;flex:none}
.ch-t{font-weight:800}
.card-row{display:flex;align-items:center;gap:12px;padding:12px 14px;border-top:1px solid var(--line);color:var(--ink);min-height:56px}
.chapter-head+.card-row,.chapter>.card-row:first-child{border-top:0}
.card-row:active{background:var(--bg)}
.card-num{width:26px;height:26px;border-radius:50%;background:var(--bg);color:var(--ink2);font-size:.8rem;font-weight:700;display:flex;align-items:center;justify-content:center;flex:none}
.card-titles{display:flex;flex-direction:column;min-width:0}
.card-titles .cn{font-weight:600;line-height:1.4}.card-titles .ja{font-size:.8rem;color:var(--muted);line-height:1.4}
.mastery-dot{width:9px;height:9px;border-radius:50%;background:var(--line);flex:none;margin-left:auto}
.mastery-dot.learning{background:var(--eco)}.mastery-dot.done{background:var(--soc)}
.mastery-dot+.go{margin-left:4px}
.pager{display:flex;justify-content:space-between;gap:10px;margin-top:22px}
.pager a{flex:1 1 0;min-width:0;padding:12px;border-radius:12px;background:#fff;border:1px solid var(--line);font-size:.88rem;color:var(--ink2);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.pager a:last-child{text-align:right}
.chips{display:flex;gap:8px;overflow-x:auto;padding:2px 0 12px;scrollbar-width:none}
.chip{flex:none;padding:6px 14px;border-radius:99px;border:1px solid var(--line);background:#fff;color:var(--ink2);font-size:.88rem}
.chip.active{background:var(--ink);color:#fff;border-color:var(--ink)}
.chip.subj-pol.active{background:var(--pol);border-color:var(--pol)}.chip.subj-eco.active{background:var(--eco);border-color:var(--eco)}.chip.subj-soc.active{background:var(--soc);border-color:var(--soc)}.chip.subj-geo.active{background:var(--geo);border-color:var(--geo)}.chip.subj-his.active{background:var(--his);border-color:var(--his)}
/* ---------- card page ---------- */
.card-head{margin-bottom:10px}
.ja-title{margin:0;color:var(--ja);font-size:.95rem}
.tabs{position:sticky;top:var(--topbar);z-index:30;display:flex;background:var(--bg);margin:0 -14px 14px;padding:6px 14px;gap:6px;border-bottom:1px solid var(--line)}
.tabs a{flex:1;text-align:center;padding:8px 0;border-radius:10px;color:var(--ink2);font-weight:600;font-size:.95rem;background:#fff;border:1px solid var(--line)}
.tabs a.active{background:var(--brand);color:#fff;border-color:var(--brand)}
@media (min-width:960px){.tabs{margin:0 -28px 18px;padding:8px 28px}}
.blk{border-radius:var(--r);padding:14px 16px;margin:0 0 16px}
.blk-label{font-size:.78rem;font-weight:800;letter-spacing:.05em;margin-bottom:4px}
.blk-conclusion{background:linear-gradient(135deg,#fff4e5,#ffe9cc);border-left:5px solid #f59e0b;font-size:1.06rem;font-weight:600;line-height:1.7}
.blk-conclusion .blk-label{color:#b45309}
.blk-summary{background:#eef0ff;border-left:5px solid var(--sum)}
.blk-summary .blk-label{color:var(--sum)}
.blk p{margin:.3em 0}
.intro{color:var(--ink2);border-left:3px solid var(--line);padding-left:12px;margin-bottom:8px}
.sec{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:4px 16px 12px;margin:0 0 16px}
.sec h3{display:flex;align-items:center;gap:8px;font-size:1.08rem;margin:12px 0 6px;padding-bottom:6px;border-bottom:2px solid currentColor}
.sec-icon{font-size:1rem}
.h-why{color:var(--why)}.h-quant{color:var(--quant)}.h-method{color:var(--method)}.h-traps{color:var(--traps)}.h-example{color:var(--brand)}.h-quiz{color:var(--sum)}.h-terms{color:var(--ja)}
.sec-why{border-top:4px solid var(--why)}.sec-quant{border-top:4px solid var(--quant);background:#f8fffd}.sec-method{border-top:4px solid var(--method)}.sec-traps{border-top:4px solid var(--traps)}.sec-example{border-top:4px solid var(--brand)}.sec-quiz{border-top:4px solid var(--sum)}.sec-terms{border-top:4px solid var(--ja)}
.sec p{margin:.55em 0}
ul.dots{margin:.4em 0;padding-left:1.2em}ul.dots li{margin:.25em 0}ul.dots li::marker{color:var(--brand)}
/* 着色 */
.t-key{color:var(--key);background:var(--key-bg);padding:0 3px;border-radius:4px;font-weight:700}
.t-ja{color:var(--ja);background:var(--ja-bg);padding:0 3px;border-radius:4px;font-weight:600}
.t-concept{color:var(--concept);font-weight:700}
.t-num{color:var(--num);background:var(--num-bg);padding:0 3px;border-radius:4px;font-weight:700;white-space:nowrap}
.t-warn{color:#fff;background:var(--warn);padding:0 5px;border-radius:4px;font-weight:700;font-size:.9em}
.t-x{color:var(--warn);font-weight:900}.t-ok{color:var(--method)}
code{background:#f1f3f8;padding:1px 5px;border-radius:5px}
mark{background:#ffe58a;color:inherit;padding:0 1px;border-radius:3px}
/* formulas */
.f-head{color:var(--quant);font-size:.95rem;margin:14px 0 6px}
.formula{border:1.5px solid #99dccf;background:#f0fbf8;border-radius:12px;padding:10px 12px;margin:10px 0}
.f-eq{font-family:"SF Mono",Menlo,Consolas,monospace;font-size:1.12rem;font-weight:800;color:var(--quant);overflow-x:auto}
.f-vars{border-collapse:collapse;margin:6px 0;font-size:.9rem;width:100%}
.f-vars th{text-align:left;color:var(--quant);font-family:monospace;padding:2px 10px 2px 0;width:3em;vertical-align:top}
.f-vars td{padding:2px 0;color:var(--ink2)}
.f-cond{font-size:.88rem;color:var(--ink2);border-top:1px dashed #99dccf;margin-top:6px;padding-top:6px}
.f-cond b{color:var(--quant)}.f-cond ul{margin:2px 0;padding-left:1.2em}
/* traps */
.trap{border-radius:12px;background:#fff;border:1px solid #f6caca;margin:10px 0;overflow:hidden}
.trap-wrong{background:var(--warn-bg);color:#991b1b;padding:9px 12px;font-weight:600;text-decoration-color:#f87171}
.trap-why{padding:0 12px;color:var(--ink2);font-size:.95rem}
.trap-fix{margin:6px 12px 10px;padding:8px 10px;border-radius:8px;background:#ecfdf3;color:#14532d}
.trap-fix b{color:var(--method)}
/* example / quiz */
.example-q,.qz-q{background:#f5f8ff;border-radius:12px;padding:12px 14px;margin:8px 0;font-weight:500}
.reveal-btn{display:block;width:100%;margin:10px 0;padding:11px;border-radius:12px;border:1.5px dashed var(--brand);background:#fff;color:var(--brand);font-weight:700}
.answer{display:none;border-radius:12px;background:#f6fef9;border:1px solid #bfe8cf;padding:6px 14px 10px;margin:8px 0}
.answer.show{display:block}
.steps{padding-left:1.3em;margin:.5em 0}.steps li{margin:.3em 0}
.final{font-weight:800;color:var(--method)}
.final.ng{color:var(--warn)}
.quiz-q{display:flex;gap:10px;margin:12px 0}
.qn{flex:none;width:26px;height:26px;border-radius:50%;background:var(--sum);color:#fff;font-size:.8rem;font-weight:700;display:flex;align-items:center;justify-content:center;margin-top:2px}
.quiz-q>div{flex:1;min-width:0}
textarea{width:100%;min-height:72px;margin-top:6px;padding:8px 10px;border:1px solid var(--line);border-radius:10px;font:inherit;font-size:.95rem;resize:vertical;background:#fcfcfe}
.term-table{width:100%;border-collapse:collapse;font-size:.93rem}
.term-table th{text-align:left;font-size:.78rem;color:var(--muted);padding:6px 4px;border-bottom:1px solid var(--line)}
.term-table td{padding:8px 4px;border-bottom:1px solid var(--line);vertical-align:top}
.t-ja-cell{color:var(--ja);font-weight:600}
.term-table tr:nth-child(even) td{background:#fafbff}
.mastery-wrap{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-top:18px;font-size:.9rem;color:var(--ink2)}
.mastery-control{display:flex;gap:6px}
.mastery-control button{padding:6px 12px;border-radius:99px;border:1px solid var(--line);background:#fff;color:var(--ink2);font-size:.85rem}
.mastery-control button.active.unread{background:var(--ink2);color:#fff}
.mastery-control button.active.learning{background:var(--eco);color:#fff;border-color:var(--eco)}
.mastery-control button.active.done{background:var(--soc);color:#fff;border-color:var(--soc)}
/* past / quiz */
.note-src{font-size:.86rem;background:#fffbea;border:1px solid #f5e1a4;color:#7a5b00;border-radius:12px;padding:8px 12px}
.start-row{display:flex;flex-wrap:wrap;gap:8px;margin:14px 0}
.start-btn{flex:1 1 auto;text-align:center;padding:12px 14px;border-radius:12px;background:var(--brand);color:#fff;font-weight:700}
.start-btn.ghost{background:#fff;color:var(--brand);border:1.5px solid var(--brand)}
.start-btn.warn{color:var(--warn);border-color:var(--warn)}
.qz-top{display:flex;align-items:center;gap:8px;flex-wrap:wrap;font-size:.85rem}
.qz-prog{font-weight:800}
.badge{padding:1px 8px;border-radius:99px;font-size:.75rem;font-weight:700;background:var(--brand-bg);color:var(--brand)}
.badge.src-think{background:#eef0ff;color:var(--sum)}
.qz-from{font-weight:600}
.qz-bar{height:5px;border-radius:5px;background:var(--line);margin:8px 0 12px;overflow:hidden}.qz-bar i{display:block;height:100%;background:var(--brand)}
.qz-opts{display:flex;flex-direction:column;gap:8px}
.quiz-option{text-align:left;padding:11px 14px;border-radius:12px;border:1.5px solid var(--line);background:#fff;color:var(--ink);line-height:1.55}
.quiz-option b{color:var(--brand);margin-right:4px}
.quiz-option.correct{border-color:var(--soc);background:#ecfdf3}
.quiz-option.wrong{border-color:var(--warn);background:var(--warn-bg)}
.qz-ta{min-height:90px}
.self-mark{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin-top:8px;font-size:.9rem}
.self-mark button{padding:5px 12px;border-radius:99px;border:1px solid var(--line);background:#fff}
.self-mark button.active[data-ok="1"]{background:var(--soc);color:#fff}.self-mark button.active[data-ok="0"]{background:var(--warn);color:#fff}
.qz-link{font-size:.88rem}
.qz-nav{position:sticky;bottom:0;display:flex;justify-content:space-between;gap:10px;padding:10px 0 calc(10px + env(safe-area-inset-bottom));background:linear-gradient(transparent,var(--bg) 30%)}
.qz-nav button{flex:1;padding:12px;border-radius:12px;border:0;background:var(--brand);color:#fff;font-weight:700}
.qz-nav button.ghost{background:#fff;color:var(--brand);border:1.5px solid var(--brand)}
.score-card{font-size:1.1rem;background:#fff;border-radius:var(--r);border:1px solid var(--line);padding:18px;text-align:center}
.score-card b{font-size:2rem;color:var(--soc)}
/* search */
.result{display:flex;flex-direction:column;gap:2px;padding:12px 14px;background:#fff;border:1px solid var(--line);border-radius:12px;margin:0 0 8px;color:var(--ink)}
.r-meta{font-size:.76rem;font-weight:700}
.r-t{font-weight:700}.r-t small{color:var(--muted);font-weight:500}
.r-term{font-size:.85rem;color:var(--ja)}
.r-snip{font-size:.85rem;color:var(--ink2)}

.practice-divider{display:flex;align-items:center;gap:10px;margin:28px 0 14px;color:var(--brand);font-weight:800;font-size:.95rem}
.practice-divider::before,.practice-divider::after{content:"";flex:1;height:2px;background:var(--brand-bg)}
.practice-more{text-align:right;font-size:.88rem;margin:-4px 0 0}

.supp-head{margin:18px 0 6px;padding:4px 10px;border-left:4px solid var(--why);background:#fff8ec;border-radius:6px;font-size:.92rem}
.mc-q{margin:14px 0 18px}.mc-stem{display:flex;gap:10px;font-weight:600;align-items:flex-start}.mc-t{flex:1;min-width:0}.mc-q .qz-opts{margin-left:0}.mc-ans{margin-top:8px}

.card-head{position:relative}
.lang-switch{float:right;display:inline-flex;border:1.5px solid var(--brand);border-radius:99px;overflow:hidden;margin:0 0 6px 8px}
.lang-switch button{border:0;background:#fff;color:var(--brand);font-size:.78rem;font-weight:700;padding:5px 10px;line-height:1.2}
.lang-switch button.on{background:var(--brand);color:#fff}
.mc-q{padding:14px 0;border-bottom:1px dashed var(--line)}.mc-q:last-child{border-bottom:0}
.mc-stem{display:flex;gap:10px;font-weight:600;margin-bottom:10px}
.mc-src{display:inline-block;margin-left:6px;font-size:.7rem;font-weight:700;padding:0 7px;border-radius:99px;background:var(--brand-bg);color:var(--brand);vertical-align:middle}
.quiz-option{display:flex;gap:8px;align-items:flex-start;width:100%;cursor:pointer}
.quiz-option b{flex:none;display:inline-flex;align-items:center;justify-content:center;width:1.6em;height:1.6em;border-radius:50%;background:var(--brand-bg);margin:0}
.quiz-option span{flex:1;min-width:0}
.quiz-option.selected{border-color:var(--brand);background:var(--brand-bg)}
.quiz-option.selected b{background:var(--brand);color:#fff}
.quiz-option:disabled{cursor:default;opacity:1}
.quiz-option.correct b{background:var(--soc);color:#fff}.quiz-option.wrong b{background:var(--warn);color:#fff}
.submit-btn{margin-top:10px;width:100%;padding:11px;border-radius:12px;border:0;background:var(--brand);color:#fff;font-weight:700;font-size:1rem}
.submit-btn:disabled{background:var(--line);color:#888}
.final.ok{color:var(--soc);font-weight:800}.final.ng{color:var(--warn);font-weight:800}
.mc-why b{color:var(--brand);margin-right:4px}
.mc-note{font-size:.82rem;color:#777;margin:6px 0}

/* v7: 题目区纯文字，不做彩色强调 */
.mc-q .mc-stem,.qz-q.plain{font-weight:500;color:var(--ink,#222)}
.mc-q .qn{background:none;color:inherit;font-weight:600;min-width:auto;width:auto;height:auto;border-radius:0}
.mc-q .quiz-option,.qz-opts.plain .quiz-option{background:#fff;border:1px solid #d6d6d6;color:#222;font-weight:400}
.mc-q .quiz-option b,.qz-opts.plain .quiz-option b{background:none;color:#222;border:1px solid #bbb;font-weight:600}
.mc-q .quiz-option.selected,.qz-opts.plain .quiz-option.selected{border:2px solid #333;background:#fff}
.mc-q .quiz-option.selected b,.qz-opts.plain .quiz-option.selected b{background:#333;color:#fff;border-color:#333}
.mc-q .quiz-option.correct,.qz-opts.plain .quiz-option.correct{border:2px solid #2e7d32;background:#fff}
.mc-q .quiz-option.wrong,.qz-opts.plain .quiz-option.wrong{border:2px solid #c62828;background:#fff}
.mc-q .quiz-option.correct b,.mc-q .quiz-option.wrong b,.qz-opts.plain .quiz-option.correct b,.qz-opts.plain .quiz-option.wrong b{background:none;color:#222;border-color:#bbb}
.submit-btn{background:#333}
.mc-ans,.mc-q .answer,#ans{background:#fafafa;border:1px solid #e3e3e3;color:#222}
.final.ok{color:#2e7d32;font-weight:600}.final.ng{color:#c62828;font-weight:600}
.mc-why{color:#333;font-weight:400}
.example-q{color:#222}
/* 真题：场次列表与逐题刷 */
.exam-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:10px;margin-bottom:8px}
.exam-tile{display:flex;flex-direction:column;gap:2px;padding:14px;border-radius:var(--r);background:#fff;border:1px solid var(--line);color:var(--ink)}
.exam-tile:active{transform:scale(.98)}
.et-y{font-size:.85rem;color:var(--muted)}
.et-r{font-weight:800;font-size:1.15rem}
.et-meta{font-size:.8rem;color:var(--ink2)}
.exam-tile .st-bar i{background:var(--brand)}
.et-go{margin-top:6px;font-weight:700;color:var(--brand);font-size:.9rem}
.muted-note{font-size:.85rem;color:var(--muted);margin-top:14px}
.qz-sheet-btn{margin-left:auto;border:1px solid var(--line);background:#fff;border-radius:99px;padding:4px 12px;font-size:.82rem;color:var(--ink2)}
.qz-sheet{display:grid;grid-template-columns:repeat(auto-fill,minmax(40px,1fr));gap:6px;margin:4px 0 12px}
.qs-n{padding:8px 0;border-radius:8px;border:1px solid var(--line);background:#fff;font-weight:700;color:var(--ink2)}
.qs-n.ok{background:#e8f7ee;border-color:#9fd8b4;color:#1d7a43}
.qs-n.ng{background:#fdecec;border-color:#f2b1b1;color:#b42318}
.qs-n.cur{outline:2px solid var(--brand)}
.ex-mat{background:#fff;border:1px solid var(--line);border-radius:12px;margin:8px 0;padding:0 14px}
.ex-mat summary{cursor:pointer;padding:10px 0;font-weight:700;color:var(--ink2)}
.ex-mat-body{max-height:45vh;overflow:auto;padding-bottom:10px;line-height:1.8}
.ex-mat-body p,.ex-fig p,.mc-why p{margin:.3em 0}
.ex-no{margin-right:4px}
.ex-fig-tag{color:var(--muted);font-size:.9em}
.ex-fig{font-size:.88rem;color:var(--ink2);background:#fafafa;border:1px dashed var(--line);border-radius:10px;padding:6px 12px;margin:0 0 10px}
.redo-btn{margin-top:8px;border:1px solid var(--line);background:#fff;border-radius:10px;padding:6px 12px;color:var(--ink2)}
.qz-sheet[hidden]{display:none}

.ex-figwrap{margin:10px 0}.ex-fig-img{max-width:100%;height:auto;display:block;margin:0 auto;border:1px solid #ddd;border-radius:8px;background:#fff}.ex-mat-body u{text-decoration-thickness:2px;text-underline-offset:3px}
.paper-link-row{margin:10px 0 2px}
.paper-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:12px;margin:10px 0 18px}
.paper-pg{display:block;background:#fff;border:1px solid var(--line);border-radius:var(--r);overflow:hidden;color:var(--ink)}
.paper-pg img{width:100%;height:auto;display:block}
.paper-pg span{display:block;padding:8px 10px;font-size:.86rem;color:var(--ink2)}