:root{--bg:#f6f7fb;--panel:#fff;--panel-2:#f8fafc;--ink:#111827;--muted:#6b7280;--line:#e5e7eb;--brand:#4f46e5;--brand2:#7c3aed;--brand3:#a855f7;--brand-strong:#4f46e5;--hero1:#4f46e5;--hero2:#7c3aed;--hero3:#a855f7;--brand-soft:#eef2ff;--hover:#fafaff;--ok:#16a34a;--ok-soft:#dcfce7;--bad:#dc2626;--bad-soft:#fee2e2;--warn:#d97706;--letter-bg:#eef2f7;--letter-ink:#475569;--ans-bg:#f0fdf4;--ans-border:#bbf7d0;--ans-ink:#065f46;--score-bg:#eef2ff;--score-border:#c7d2fe;--score-ink:#3730a3;--ad-bg:#f8fafc;--ad-border:#cbd5e1;--ad-ink:#94a3b8;--note-bg:#fffbeb;--note-border:#fde68a;--note-ink:#92400e;--tag-bg:#eef2f7;--header-bg:rgba(255,255,255,.86);--mark:#fde68a;--mark-ink:#111827;--shadow:0 1px 2px rgba(16,24,40,.06),0 8px 24px rgba(16,24,40,.06);--radius:16px}
html[data-theme="dark"]{--bg:#0b1020;--panel:#121a2e;--panel-2:#0f172a;--ink:#e5e7eb;--muted:#94a3b8;--line:#243049;--brand:#818cf8;--brand2:#a78bfa;--brand3:#c084fc;--brand-strong:#6d28d9;--brand-soft:#1e2742;--hover:#182140;--ok:#4ade80;--ok-soft:#12301f;--bad:#f87171;--bad-soft:#3a1620;--warn:#fbbf24;--letter-bg:#1f2a44;--letter-ink:#cbd5e1;--ans-bg:#0f2a1c;--ans-border:#1f5136;--ans-ink:#bbf7d0;--score-bg:#1e2742;--score-border:#334155;--score-ink:#c7d2fe;--ad-bg:#0f172c;--ad-border:#2a3a5c;--ad-ink:#64748b;--note-bg:#2a1f0a;--note-border:#5c4410;--note-ink:#fcd34d;--tag-bg:#1e2742;--header-bg:rgba(11,16,32,.86);--mark:#a16207;--mark-ink:#fff7ed;--shadow:0 1px 2px rgba(0,0,0,.45),0 8px 24px rgba(0,0,0,.4);color-scheme:dark}
html[data-accent="teal"]{--brand:#0d9488;--brand2:#0891b2;--brand3:#22d3ee;--brand-soft:#ecfeff;--brand-strong:#0f766e;--hero1:#0d9488;--hero2:#0891b2;--hero3:#22d3ee}
html[data-theme="dark"][data-accent="teal"]{--brand:#2dd4bf;--brand2:#22d3ee;--brand3:#67e8f9;--brand-soft:#0f2f2e;--brand-strong:#0f766e}
html[data-accent="orange"]{--brand:#ea580c;--brand2:#f97316;--brand3:#fbbf24;--brand-soft:#fff7ed;--brand-strong:#c2410c;--hero1:#ea580c;--hero2:#f97316;--hero3:#fbbf24}
html[data-theme="dark"][data-accent="orange"]{--brand:#fb923c;--brand2:#fbbf24;--brand3:#fde68a;--brand-soft:#3a2412;--brand-strong:#c2410c}
html[data-accent="blue"]{--brand:#1d4ed8;--brand2:#2563eb;--brand3:#60a5fa;--brand-soft:#eff6ff;--brand-strong:#1d4ed8;--hero1:#1d4ed8;--hero2:#2563eb;--hero3:#60a5fa}
html[data-theme="dark"][data-accent="blue"]{--brand:#60a5fa;--brand2:#93c5fd;--brand3:#bfdbfe;--brand-soft:#16233f;--brand-strong:#1d4ed8}
html[data-accent="mono"]{--brand:#111827;--brand2:#374151;--brand3:#6b7280;--brand-soft:#f3f4f6;--brand-strong:#111827;--hero1:#111827;--hero2:#374151;--hero3:#6b7280}
html[data-theme="dark"][data-accent="mono"]{--brand:#cbd5e1;--brand2:#94a3b8;--brand3:#64748b;--brand-soft:#1e293b;--brand-strong:#334155}
*{box-sizing:border-box}html,body{margin:0;padding:0}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;background:var(--bg);color:var(--ink);line-height:1.65;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
.container{max-width:1080px;margin:0 auto;padding:0 16px}
.site-header{position:sticky;top:0;z-index:50;background:var(--header-bg);backdrop-filter:saturate(180%) blur(12px);border-bottom:1px solid var(--line)}
.header-inner{display:flex;align-items:center;gap:12px;height:56px}
.brand{display:flex;align-items:center;gap:8px;font-weight:800;font-size:17px;flex:0 0 auto}
.brand .logo{width:28px;height:28px;border-radius:8px;background:var(--brand-strong);display:flex;align-items:center;justify-content:center;color:#fff;font-size:15px}
.brand .sub{font-weight:400;font-size:12px;color:var(--muted);margin-left:6px}
.gsearch{position:relative;flex:1;max-width:440px;margin-left:auto}
.gsearch input{width:100%;border:1px solid var(--line);background:var(--panel);color:var(--ink);border-radius:12px;padding:9px 14px;font-size:14px;font-family:inherit;outline:none}
.gsearch input:focus{border-color:var(--brand);box-shadow:0 0 0 3px var(--brand-soft)}
.gresults{position:absolute;top:calc(100% + 6px);left:0;right:0;background:var(--panel);border:1px solid var(--line);border-radius:12px;box-shadow:var(--shadow);max-height:60vh;overflow:auto;display:none;z-index:90}
.gresults.show{display:block}
.gr-head{padding:8px 12px;font-size:12px;color:var(--muted);border-bottom:1px solid var(--line)}
.gr-empty{padding:14px 12px;font-size:13px;color:var(--muted)}
.gre{display:block;padding:10px 12px;border-bottom:1px solid var(--line);font-size:14px}
.gre:last-child{border-bottom:none}.gre:hover{background:var(--brand-soft)}
.gre .gt{display:block;line-height:1.45}
.gre .cat{display:block;font-size:12px;color:var(--muted);margin-top:2px}
.gre.disabled{opacity:.55;cursor:default}
.gre mark{background:var(--mark);color:var(--mark-ink);border-radius:3px;padding:0 2px}
.theme-btn{border:1px solid var(--line);background:var(--panel);color:var(--ink);border-radius:10px;width:38px;height:38px;font-size:16px;cursor:pointer;flex:0 0 auto}
.top-actions{display:flex;gap:6px;align-items:center;flex:0 0 auto}
.hero{background:linear-gradient(135deg,var(--hero1),var(--hero2) 60%,var(--hero3));color:#fff;padding:44px 0 40px;border-bottom:1px solid rgba(255,255,255,.15)}
.hero h1{margin:0 0 8px;font-size:30px;letter-spacing:.5px}
.hero p{margin:0;opacity:.9;font-size:15px}
.stats{display:flex;gap:24px;margin-top:22px;flex-wrap:wrap}
.stat{background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.25);border-radius:14px;padding:12px 18px;min-width:110px}
.stat b{display:block;font-size:22px}.stat span{font-size:12px;opacity:.9}
.breadcrumb{display:flex;gap:6px;flex-wrap:wrap;font-size:13px;color:var(--muted);padding:16px 0 0}
.breadcrumb a{color:var(--brand)}.breadcrumb .sep{opacity:.5}
.section-title{display:flex;align-items:center;gap:10px;margin:26px 0 12px;font-size:15px;font-weight:700}
.section-title .tag{font-size:12px;font-weight:500;color:var(--muted);background:var(--tag-bg);border-radius:999px;padding:2px 8px}
.grid{display:grid;gap:12px}.grid.cards{grid-template-columns:repeat(auto-fill,minmax(220px,1fr))}
.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:16px;box-shadow:var(--shadow);transition:transform .12s,border-color .12s;display:block}
a.card:hover{transform:translateY(-2px);border-color:var(--brand)}
.card .name{font-weight:700;font-size:15px;display:flex;align-items:center;justify-content:space-between;gap:8px}
.card .name .arrow{color:var(--brand);opacity:.6}
.card .meta{margin-top:8px;font-size:12px;color:var(--muted);display:flex;gap:10px;flex-wrap:wrap}
.card.disabled{opacity:.55}
.tag-example{font-size:11px;color:var(--warn);background:var(--note-bg);border:1px solid var(--note-border);border-radius:999px;padding:1px 7px}
.chips{display:flex;gap:8px;flex-wrap:wrap;margin:10px 0 0}
.chip{font-size:12px;color:var(--muted);background:var(--tag-bg);border-radius:999px;padding:3px 10px}
.chip.ok{color:var(--ok);background:var(--ok-soft)}
.paper-list{display:grid;gap:10px;grid-template-columns:repeat(auto-fill,minmax(300px,1fr))}
.paper-row{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:14px 16px;box-shadow:var(--shadow);display:block}
a.paper-row:hover{border-color:var(--brand)}
.paper-row .t{font-weight:600;font-size:14px;line-height:1.5}
.paper-row .m{margin-top:6px;font-size:12px;color:var(--muted);display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.note{margin:12px 0;padding:10px 14px;background:var(--note-bg);border:1px solid var(--note-border);color:var(--note-ink);border-radius:12px;font-size:13px}
.pages{display:flex;gap:6px;flex-wrap:wrap;margin:18px 0;align-items:center}
.pages a,.pages span{min-width:36px;height:36px;padding:0 10px;border:1px solid var(--line);border-radius:9px;display:flex;align-items:center;justify-content:center;font-size:13px;background:var(--panel)}
.pages a:hover{border-color:var(--brand);color:var(--brand);background:var(--brand-soft)}
.pages .cur{background:var(--brand-strong);color:#fff;border-color:var(--brand-strong)}
.pages .gap{border:none;background:none;color:var(--muted);min-width:auto;padding:0 2px}
.ad-slot{margin:18px 0;border:1px dashed var(--ad-border);background:var(--ad-bg);color:var(--ad-ink);border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:12px;min-height:70px}
.ad-wrap{margin:18px 0}.ad-wrap ins{display:block;width:100%}
.searchbar{display:flex;align-items:center;gap:10px;margin:14px 0}
.searchbar input{flex:1;min-width:0;border:1px solid var(--line);border-radius:12px;padding:10px 14px;font-size:14px;font-family:inherit;background:var(--panel);color:var(--ink);outline:none}
.searchbar input:focus{border-color:var(--brand);box-shadow:0 0 0 3px var(--brand-soft)}
.searchbar span{font-size:12px;color:var(--muted);white-space:nowrap}
.q-pos{margin-left:auto;font-size:12px;color:var(--muted)}
.q-foot{display:flex;align-items:center;justify-content:space-between;gap:8px;margin-top:12px;padding-top:10px;border-top:1px dashed var(--line)}
.qnav-btn{font-size:13px;color:var(--brand);border:1px solid var(--line);border-radius:9px;padding:6px 12px;background:var(--panel)}
.qnav-btn:hover{background:var(--brand-soft);border-color:var(--brand)}
.qnav-btn.disabled{color:var(--ad-ink);cursor:default;background:var(--panel-2)}
.qnav-btn.top{color:var(--muted)}
.paper-wrap{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:22px;align-items:start;padding-bottom:40px}
.paper-main{min-width:0}
.paper-title{margin:14px 0 6px;font-size:24px;line-height:1.35}
.toolbar{display:flex;gap:8px;flex-wrap:wrap;align-items:center;margin:14px 0}
.q-ind{font-size:12px;color:var(--muted);margin-left:auto;white-space:nowrap}
.btn{border:1px solid var(--line);background:var(--panel);border-radius:10px;padding:8px 14px;font-size:13px;cursor:pointer;color:var(--ink);display:inline-block}
.btn:hover{background:var(--brand-soft);border-color:var(--brand)}
.btn.primary{background:var(--brand-strong);color:#fff;border-color:var(--brand-strong)}
.btn.primary:hover{filter:brightness(.95)}
.q{background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:16px 18px;margin:12px 0;box-shadow:var(--shadow);scroll-margin-top:70px}
.q-head{display:flex;align-items:center;gap:10px;margin-bottom:8px}
.q-num{width:28px;height:28px;border-radius:50%;background:var(--brand-soft);color:var(--brand);font-weight:700;display:flex;align-items:center;justify-content:center;font-size:13px;flex:0 0 28px}
.q-type{font-size:12px;color:var(--brand);background:var(--brand-soft);border-radius:999px;padding:2px 9px}
.q.right{border-color:var(--ok);box-shadow:0 0 0 2px var(--ok-soft)}
.q.wrong{border-color:var(--bad);box-shadow:0 0 0 2px var(--bad-soft)}
.stem{font-size:16px;margin:4px 0 12px;word-break:break-word}
.stem img,.opt img,.ans-body img{max-width:100%;height:auto;vertical-align:middle}
.stem table{border-collapse:collapse;max-width:100%}
.stem td,.stem th{border:1px solid var(--line);padding:4px 8px}
.blank{display:inline-block;min-width:70px;border-bottom:2px solid var(--brand);color:var(--muted);text-align:center}
.opts{display:flex;flex-direction:column;gap:8px}
.opt{display:flex;align-items:flex-start;gap:10px;border:1px solid var(--line);background:var(--panel);border-radius:12px;padding:10px 12px;cursor:pointer;text-align:left;font-size:15px;color:var(--ink);width:100%;font-family:inherit}
.opt:hover{border-color:var(--brand);background:var(--hover)}
.opt .letter{flex:0 0 26px;height:26px;border-radius:50%;background:var(--letter-bg);display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:700;color:var(--letter-ink)}
.opt.sel{border-color:var(--brand);background:var(--brand-soft)}
.opt.sel .letter{background:var(--brand-strong);color:#fff}
.opt.correct{border-color:var(--ok);background:var(--ok-soft)}
.opt.correct .letter{background:var(--ok);color:#fff}
.opt.wrong{border-color:var(--bad);background:var(--bad-soft)}
.opt.wrong .letter{background:var(--bad);color:#fff}
.opt.dim{opacity:.5}
.ans{margin-top:12px}
.ans summary{cursor:pointer;font-size:13px;color:var(--brand);font-weight:600;list-style:none}
.ans summary::-webkit-details-marker{display:none}
.ans summary::before{content:"▸ "}.ans[open] summary::before{content:"▾ "}
.ans-body{margin-top:8px;padding:12px 14px;background:var(--ans-bg);border:1px solid var(--ans-border);border-radius:12px;font-size:14.5px;color:var(--ans-ink)}
.ans-body ol{margin:6px 0;padding-left:20px}
.side{position:sticky;top:72px;display:flex;flex-direction:column;gap:14px}
.side-card{background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:14px;box-shadow:var(--shadow)}
.side-card h4{margin:0 0 10px;font-size:13px;color:var(--muted);font-weight:600}
.qnav{display:grid;grid-template-columns:repeat(auto-fill,minmax(34px,1fr));gap:6px}
.qnav a{height:34px;border:1px solid var(--line);border-radius:9px;display:flex;align-items:center;justify-content:center;font-size:12px;color:var(--letter-ink)}
.qnav a:hover{border-color:var(--brand);color:var(--brand);background:var(--brand-soft)}
.qnav a.cur{border-color:var(--brand-strong);background:var(--brand-strong);color:#fff}
.pager{display:flex;gap:10px;margin:22px 0 0;flex-wrap:wrap}
.pager a,.pager span{flex:1 1 0;min-width:0;border:1px solid var(--line);border-radius:12px;padding:12px 14px;background:var(--panel);font-size:14px;display:block}
.pager a:hover{border-color:var(--brand);background:var(--hover)}
.pager .k{font-size:12px;color:var(--muted);display:block}
.pager .v{font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;display:block}
.pager .next{text-align:right}
.q-section{font-weight:700;color:var(--warn);margin:20px 0 6px;font-size:16px}
.score{display:none;margin:14px 0;padding:14px 16px;border-radius:14px;background:var(--score-bg);border:1px solid var(--score-border);font-weight:700;color:var(--score-ink)}
.score.show{display:block}
footer{border-top:1px solid var(--line);background:var(--panel);color:var(--muted);font-size:12px;padding:22px 0;margin-top:40px}
.mobile-pager{display:none}
body.paged .q{display:none}
body.paged .q.active{display:block;animation:qfade .18s ease}
body.paged .q-section{display:none}
body.searching .q{display:block}
@keyframes qfade{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
@media(max-width:860px){
 .header-inner{height:auto;flex-wrap:wrap;padding:8px 0;gap:8px}
 .gsearch{order:3;flex-basis:100%;max-width:none;margin:0}
 .top-actions{margin-left:auto}
 .paper-wrap{grid-template-columns:1fr}
 .side{position:static;flex-direction:column}
 .hero h1{font-size:24px}.paper-title{font-size:20px}
 .grid.cards{grid-template-columns:1fr 1fr}
 .paper-list{grid-template-columns:1fr}
 .brand .sub{display:none}
 body{padding-bottom:66px}
 .mobile-pager{display:flex;position:fixed;left:0;right:0;bottom:0;z-index:60;background:var(--header-bg);backdrop-filter:blur(10px);border-top:1px solid var(--line);padding:8px 12px;gap:10px}
 .mobile-pager a{flex:1;text-align:center;border:1px solid var(--line);border-radius:10px;padding:11px;font-size:13px;background:var(--panel)}
}
@media(max-width:420px){.grid.cards{grid-template-columns:1fr}}