*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
:root{--red:#b91c1c;--ink:#1f2430;--mut:#6b7280;--line:#e5e7eb;--bg:#f6f7f9;--ok:#15803d;--bad:#dc2626}
html,body{margin:0;padding:0}
body{font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;background:var(--bg);color:var(--ink);font-size:16px;line-height:1.65}
header{position:sticky;top:0;background:#fff;border-bottom:1px solid var(--line);z-index:20}
.header-in{max-width:860px;margin:0 auto;display:flex;align-items:center;gap:10px;padding:10px 14px}
.logo{font-size:20px;font-weight:800;color:var(--red);background:none;border:none;cursor:pointer;padding:0}
.header-sub{color:var(--mut);font-size:12px;flex:1;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.header-btn{background:#fff;border:1px solid var(--line);border-radius:999px;padding:5px 12px;cursor:pointer;font-size:14px}
.badge{background:var(--red);color:#fff;border-radius:999px;padding:0 7px;font-size:12px;margin-left:2px}
main{max-width:860px;margin:0 auto;padding:16px 14px 40px}
footer{max-width:860px;margin:0 auto;padding:14px;color:var(--mut);font-size:12px;text-align:center}
.hidden{display:none!important}
.hero{background:linear-gradient(135deg,#b91c1c,#7f1d1d);color:#fff;border-radius:14px;padding:20px 18px;margin-bottom:16px}
.hero h1{margin:0 0 4px;font-size:22px}
.hero p{margin:0 0 14px;opacity:.85;font-size:14px}
.search-row{display:flex;gap:8px}
.search-row input{flex:1;border:none;border-radius:10px;padding:11px 12px;font-size:15px;min-width:0}
.search-row button{border:none;border-radius:10px;padding:11px 18px;background:#111827;color:#fff;font-size:15px;cursor:pointer}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:12px}
.module-card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:16px}
.module-card h3{margin:0 0 2px;font-size:18px}
.module-card .counts{color:var(--mut);font-size:13px;margin-bottom:12px}
.module-card .row{display:flex;gap:8px}
.module-card button{flex:1;border-radius:10px;padding:9px 0;font-size:14px;cursor:pointer;border:1px solid var(--red);background:var(--red);color:#fff}
.module-card button.alt{background:#fff;color:var(--red)}
#paper-list-wrap{margin-top:20px}
#paper-list-wrap h2{font-size:17px}
.paper-item{background:#fff;border:1px solid var(--line);border-radius:12px;padding:12px 14px;margin-bottom:8px;cursor:pointer;display:flex;justify-content:space-between;gap:10px;align-items:center}
.paper-item:hover{border-color:var(--red)}
.paper-item .t{font-size:15px}
.paper-item .m{color:var(--mut);font-size:12px;white-space:nowrap}
.more-btn{width:100%;padding:11px;border:1px solid var(--line);background:#fff;border-radius:10px;cursor:pointer;font-size:15px}
.runner-top{display:flex;align-items:center;gap:10px;margin-bottom:8px}
.runner-top #runner-title{flex:1;font-weight:700;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.runner-top #runner-progress{color:var(--mut);font-size:13px;white-space:nowrap}
.ghost{background:none;border:1px solid var(--line);border-radius:8px;padding:5px 10px;cursor:pointer}
.progress-bar{height:6px;background:var(--line);border-radius:99px;overflow:hidden;margin-bottom:14px}
#progress-fill{height:100%;background:var(--red);width:0;transition:width .25s}
.q-card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px 16px}
.q-meta{display:flex;gap:8px;align-items:center;margin-bottom:10px}
.q-kind{background:#fef2f2;color:var(--red);border:1px solid #fecaca;font-size:12px;border-radius:999px;padding:1px 9px}
.q-seq{color:var(--mut);font-size:13px}
.material{background:#fffbeb;border:1px solid #fde68a;border-radius:10px;padding:12px 14px;margin-bottom:14px;font-size:15px}
.material .mat-tag{font-size:12px;color:#92400e;font-weight:700;margin-bottom:4px}
.q-stem{font-size:16.5px}
.q-stem img,.material img,.opt img,.expl img{max-width:100%;height:auto;vertical-align:middle}
.q-stem p,.material p{margin:.4em 0}
.opts{margin-top:14px;display:flex;flex-direction:column;gap:9px}
.opt{display:flex;gap:10px;align-items:flex-start;text-align:left;width:100%;background:#fff;border:1.5px solid var(--line);border-radius:12px;padding:11px 13px;font-size:15.5px;cursor:pointer;line-height:1.55}
.opt .k{font-weight:800;flex:none}
.opt.sel{border-color:#2563eb;background:#eff6ff}
.opt.right{border-color:var(--ok);background:#f0fdf4}
.opt.wrong{border-color:var(--bad);background:#fef2f2}
.opt.dim{opacity:.55}
.opt p{margin:0;display:inline}
.confirm-row{margin-top:12px}
.confirm-btn{background:#2563eb;color:#fff;border:none;border-radius:10px;padding:11px 22px;font-size:15px;cursor:pointer}
.result-line{margin-top:14px;font-weight:700}
.result-line.ok{color:var(--ok)}
.result-line.bad{color:var(--bad)}
.expl{margin-top:10px;background:#f8fafc;border:1px solid var(--line);border-radius:10px;padding:12px 14px;font-size:15px}
.expl .expl-tag{font-weight:800;color:var(--red);margin-bottom:4px}
.expl p{margin:.4em 0}
.runner-nav{display:flex;gap:8px;margin-top:14px}
.nav-btn{flex:1;padding:12px 0;border-radius:10px;border:1px solid var(--line);background:#fff;font-size:15px;cursor:pointer}
.nav-btn.primary{background:var(--red);color:#fff;border-color:var(--red)}
.nav-btn:disabled{opacity:.4}
#card-sheet{background:#fff;border:1px solid var(--line);border-radius:12px;padding:14px;margin-top:12px}
#card-sheet .cells{display:grid;grid-template-columns:repeat(auto-fill,minmax(40px,1fr));gap:6px}
#card-sheet .cell{border:1px solid var(--line);border-radius:8px;padding:6px 0;text-align:center;cursor:pointer;font-size:13px}
#card-sheet .cell.done{background:#dbeafe;border-color:#93c5fd}
#card-sheet .cell.cur{outline:2px solid var(--red)}
#card-sheet .cell.right{background:#dcfce7}
#card-sheet .cell.wrong{background:#fee2e2}
.score-box{background:#fff;border:1px solid var(--line);border-radius:14px;padding:22px 16px;text-align:center;margin-bottom:14px}
.score-box .big{font-size:40px;font-weight:800;color:var(--red)}
.empty{color:var(--mut);text-align:center;padding:30px 0}

.gen-card{margin-top:14px}
.gen-row{display:flex;gap:8px;margin-top:8px}
.gen-row select{flex:1;padding:10px;border:1px solid #ddd;border-radius:10px;font-size:15px;background:#fff;color:#222}
.timer{font-weight:700;color:#b3541e;font-variant-numeric:tabular-nums}
.timer.warn{color:#d33}
button.small{padding:4px 10px;font-size:13px}

.modal{position:fixed;inset:0;background:rgba(0,0,0,.45);display:flex;align-items:flex-start;justify-content:center;padding:24px 12px;z-index:50;overflow:auto}
.modal.hidden{display:none}
.modal-box{background:#fff;border-radius:14px;max-width:420px;width:100%;padding:18px;position:relative}
.modal-box input{display:block;width:100%;box-sizing:border-box;margin:8px 0;padding:10px;border:1px solid #ddd;border-radius:10px;font-size:15px}
.modal-x{position:absolute;top:10px;right:10px}
.price-box{border-top:1px solid #eee;margin-top:14px;padding-top:10px;font-size:14px}