:root{--primary:#4F46E5;--primary-2:#7C3AED;--success:#10B981;--warn:#F59E0B;--danger:#EF4444;--bg:#F5F7FB;--card:#fff;--text:#1E293B;--muted:#64748B;--line:#E8ECF4;--radius:18px;--shadow:0 4px 18px rgba(30,41,59,.06)}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;padding:0;background:#E9EDF5;color:var(--text);font-family:system-ui,-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;font-size:15px;line-height:1.55}
button,input,select,textarea{font-family:inherit;font-size:inherit}
button{cursor:pointer;border:0;background:none;color:inherit}
a{color:var(--primary);text-decoration:none}
#app{max-width:480px;margin:0 auto;min-height:100vh;background:var(--bg);position:relative;box-shadow:0 0 40px rgba(30,41,59,.12);padding-bottom:76px;overflow:hidden}
.hidden{display:none!important}
.topbar{position:sticky;top:0;z-index:20;background:linear-gradient(135deg,var(--primary),var(--primary-2));color:#fff;padding:14px 16px 16px;display:flex;align-items:center;gap:10px;min-height:56px}
.topbar h1{font-size:17px;font-weight:650;margin:0;flex:1;letter-spacing:.3px}
.topbar .sub{font-size:12px;opacity:.85;font-weight:400;display:block;margin-top:1px}
.topbar .icon-btn{width:32px;height:32px;display:flex;align-items:center;justify-content:center;border-radius:10px;background:rgba(255,255,255,.15)}
.topbar .icon-btn svg{width:18px;height:18px;fill:none;stroke:#fff;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.page{padding:14px 14px 24px;animation:fade .22s ease}
@keyframes fade{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
.card{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);padding:16px;margin-bottom:12px}
.card.tight{padding:13px}
.card-title{font-size:14px;font-weight:650;margin:0 0 12px;display:flex;align-items:center;justify-content:space-between;gap:8px}
.card-title .hint{font-size:12px;color:var(--muted);font-weight:400}
.muted{color:var(--muted)}
.small{font-size:12px}
.tiny{font-size:11px}
.b{font-weight:650}
.row{display:flex;align-items:center;gap:10px}
.row.wrap{flex-wrap:wrap}
.between{justify-content:space-between}
.grid{display:grid;gap:10px}
.grid.g2{grid-template-columns:repeat(2,1fr)}
.grid.g3{grid-template-columns:repeat(3,1fr)}
.grid.g4{grid-template-columns:repeat(4,1fr)}
.stat{background:var(--card);border-radius:16px;padding:13px 12px;box-shadow:var(--shadow);text-align:center}
.stat .num{font-size:22px;font-weight:700;line-height:1.25;color:var(--primary)}
.stat .lbl{font-size:11px;color:var(--muted);margin-top:2px}
.hero{background:linear-gradient(135deg,var(--primary),var(--primary-2));color:#fff;border-radius:20px;padding:18px;margin-bottom:12px;box-shadow:0 8px 22px rgba(79,70,229,.22)}
.hero h2{margin:0 0 4px;font-size:19px}
.hero p{margin:0;opacity:.9;font-size:12px}
.hero .row{margin-top:14px}
.hero .hero-stat{background:rgba(255,255,255,.16);border-radius:12px;padding:8px 12px;text-align:center;flex:1}
.hero .hero-stat b{display:block;font-size:18px}
.hero .hero-stat span{font-size:10px;opacity:.85}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;background:var(--primary);color:#fff;border-radius:12px;padding:10px 16px;font-size:14px;font-weight:600;transition:.15s;min-height:40px}
.btn:active{transform:scale(.98)}
.btn.block{display:flex;width:100%}
.btn.ghost{background:#EEF0FF;color:var(--primary)}
.btn.outline{background:#fff;color:var(--primary);border:1px solid #D9DCFA}
.btn.soft{background:#F1F5F9;color:var(--text)}
.btn.sm{padding:6px 11px;min-height:32px;font-size:12px;border-radius:9px}
.btn.success{background:var(--success)}
.btn.danger{background:#FEF2F2;color:var(--danger)}
.btn[disabled]{opacity:.5;pointer-events:none}
.chip{display:inline-flex;align-items:center;gap:4px;padding:5px 11px;border-radius:999px;background:#F1F5F9;color:var(--muted);font-size:12px;white-space:nowrap}
.chip.active{background:var(--primary);color:#fff}
.chip.ok{background:#ECFDF5;color:#059669}
.chip.warn{background:#FFFBEB;color:#B45309}
.chip.bad{background:#FEF2F2;color:#DC2626}
.chip.info{background:#EEF0FF;color:var(--primary)}
.field{margin-bottom:12px}
.field label{display:block;font-size:12px;color:var(--muted);margin-bottom:5px;font-weight:500}
.input,select.input,textarea.input{width:100%;border:1px solid var(--line);background:#F8FAFC;border-radius:11px;padding:10px 12px;outline:none;color:var(--text);min-height:42px}
.input:focus{border-color:var(--primary);background:#fff;box-shadow:0 0 0 3px rgba(79,70,229,.1)}
textarea.input{min-height:96px;resize:vertical}
.list-item{display:flex;align-items:center;gap:12px;padding:13px 0;border-bottom:1px solid var(--line)}
.list-item:last-child{border-bottom:0}
.list-item .grow{flex:1;min-width:0}
.list-item .title{font-size:14px;font-weight:600;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.list-item .desc{font-size:12px;color:var(--muted);margin-top:2px}
.score-big{font-size:26px;font-weight:750;color:var(--primary)}
.score-big.good{color:var(--success)}
.score-big.bad{color:var(--danger)}
.progress{height:7px;background:#EEF2F7;border-radius:99px;overflow:hidden}
.progress i{display:block;height:100%;background:linear-gradient(90deg,var(--primary),var(--primary-2));border-radius:99px}
.notice{background:#EEF0FF;border:1px solid #DDD9FF;border-radius:14px;padding:12px 14px;margin-bottom:12px;display:flex;align-items:center;gap:10px}
.notice .grow{flex:1;font-size:13px}
.notice.warn{background:#FFFBEB;border-color:#FDE68A}
.tabs{display:flex;gap:8px;overflow-x:auto;padding-bottom:4px;margin-bottom:12px;scrollbar-width:none}
.tabs::-webkit-scrollbar{display:none}
.tabbar{position:fixed;bottom:0;left:50%;transform:translateX(-50%);width:100%;max-width:480px;height:66px;background:#fff;border-top:1px solid var(--line);display:flex;z-index:30;padding-bottom:env(safe-area-inset-bottom)}
.tabbar button{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;color:#94A3B8;font-size:10px}
.tabbar button svg{width:21px;height:21px;fill:none;stroke:currentColor;stroke-width:1.9;stroke-linecap:round;stroke-linejoin:round}
.tabbar button.on{color:var(--primary);font-weight:650}
.question{background:#fff;border-radius:var(--radius);padding:16px;box-shadow:var(--shadow);margin-bottom:12px}
.q-head{display:flex;justify-content:space-between;font-size:12px;color:var(--muted);margin-bottom:10px}
.q-body{font-size:15px;line-height:1.7;margin-bottom:14px;white-space:pre-wrap}
.option{display:flex;gap:10px;align-items:flex-start;border:1px solid var(--line);border-radius:12px;padding:11px 12px;margin-bottom:9px;background:#FAFBFE;font-size:14px;line-height:1.5}
.option.sel{border-color:var(--primary);background:#EEF0FF;color:var(--primary);font-weight:600}
.option.correct{border-color:var(--success);background:#ECFDF5;color:#047857}
.option.wrong{border-color:var(--danger);background:#FEF2F2;color:#B91C1C}
.md{font-size:14px;line-height:1.75;color:#334155}
.md h1,.md h2,.md h3{color:var(--text);margin:18px 0 8px;line-height:1.4}
.md h1{font-size:19px}.md h2{font-size:16px;border-left:3px solid var(--primary);padding-left:9px}.md h3{font-size:14px}
.md p{margin:8px 0}
.md ul,.md ol{margin:8px 0;padding-left:20px}
.md li{margin:4px 0}
.md strong{color:var(--primary)}
.md blockquote{margin:10px 0;padding:8px 12px;background:#F8FAFC;border-left:3px solid #CBD5E1;color:var(--muted);font-size:13px;border-radius:0 8px 8px 0}
.md table{width:100%;border-collapse:collapse;margin:12px 0;font-size:12px;display:block;overflow-x:auto}
.md th,.md td{border:1px solid var(--line);padding:7px 9px;text-align:left;white-space:nowrap}
.md th{background:#F1F5F9;font-weight:650}
.svg-chart{width:100%;height:auto;display:block}
.legend{display:flex;gap:14px;justify-content:center;font-size:11px;color:var(--muted);margin-top:6px}
.legend i{display:inline-block;width:9px;height:9px;border-radius:3px;margin-right:4px;vertical-align:middle}
.empty{text-align:center;padding:34px 16px;color:var(--muted)}
.empty .mark{width:56px;height:56px;margin:0 auto 12px;border-radius:18px;background:#EEF0FF;display:flex;align-items:center;justify-content:center}
.empty .mark svg{width:28px;height:28px;stroke:var(--primary);fill:none;stroke-width:1.8}
.empty p{margin:0 0 14px;font-size:13px}
.loading{display:flex;align-items:center;justify-content:center;gap:9px;padding:34px;color:var(--muted);font-size:13px}
.spin{width:18px;height:18px;border:2px solid #DDD9FF;border-top-color:var(--primary);border-radius:50%;animation:rot .8s linear infinite}
@keyframes rot{to{transform:rotate(360deg)}}
#toastRoot{position:fixed;top:18px;left:50%;transform:translateX(-50%);z-index:99;width:min(420px,90vw);pointer-events:none}
.toast{background:#1E293B;color:#fff;padding:11px 15px;border-radius:12px;margin-bottom:8px;font-size:13px;box-shadow:0 8px 24px rgba(0,0,0,.18);animation:fade .2s}
.toast.err{background:#DC2626}
.toast.ok{background:#059669}
.auth-page{min-height:100vh;background:linear-gradient(160deg,#4F46E5,#7C3AED 55%,#F5F7FB 55%);padding:44px 20px 24px}
.auth-card{background:#fff;border-radius:22px;padding:24px 20px;box-shadow:0 14px 40px rgba(30,41,59,.16);max-width:400px;margin:0 auto}
.auth-card h1{font-size:22px;margin:0 0 4px}
.auth-card .sub{color:var(--muted);font-size:12px;margin-bottom:20px}
.auth-brand{color:#fff;text-align:center;margin-bottom:26px}
.auth-brand h2{font-size:24px;margin:0 0 4px;letter-spacing:1px}
.auth-brand p{font-size:12px;opacity:.85;margin:0}
.switch{display:flex;align-items:center;justify-content:space-between;padding:11px 0;border-bottom:1px solid var(--line)}
.switch:last-child{border-bottom:0}
.toggle{width:44px;height:25px;border-radius:99px;background:#CBD5E1;position:relative;transition:.2s;flex:none}
.toggle.on{background:var(--primary)}
.toggle i{position:absolute;top:3px;left:3px;width:19px;height:19px;border-radius:50%;background:#fff;transition:.2s}
.toggle.on i{left:22px}
.kv{display:flex;justify-content:space-between;padding:9px 0;border-bottom:1px solid var(--line);font-size:13px}
.kv:last-child{border-bottom:0}
.kv span{color:var(--muted)}
.subject-card{border:1.5px solid var(--line);border-radius:14px;padding:12px 8px;text-align:center;background:#fff;transition:.15s}
.subject-card.on{border-color:var(--primary);background:#EEF0FF;color:var(--primary);font-weight:650;box-shadow:0 3px 10px rgba(79,70,229,.12)}
.subject-card .nm{font-size:14px}
.subject-card .gp{font-size:10px;color:var(--muted);margin-top:2px}
.subject-card.on .gp{color:var(--primary);opacity:.75}
.group-title{font-size:12px;color:var(--muted);margin:14px 0 8px;font-weight:600}
.result-ring{width:132px;height:132px;margin:6px auto 16px;border-radius:50%;background:conic-gradient(var(--primary) 0 var(--deg),#EEF2F7 var(--deg) 100%);display:flex;align-items:center;justify-content:center}
.result-ring .inner{width:106px;height:106px;border-radius:50%;background:#fff;display:flex;flex-direction:column;align-items:center;justify-content:center}
.result-ring .inner b{font-size:34px;color:var(--primary);line-height:1}
.result-ring .inner span{font-size:11px;color:var(--muted)}
.fold{background:#F8FAFC;border:1px solid var(--line);border-radius:12px;padding:10px 12px;margin-bottom:12px}
.fold summary{font-size:12px;color:var(--muted);cursor:pointer;outline:none}
.fold .field{margin-top:10px;margin-bottom:8px}
.paper-opt{padding:9px 11px;border:1px solid var(--line);border-radius:10px;margin-bottom:7px;font-size:13px;background:#fff;line-height:1.5}
.paper-opt.mine{border-color:#F59E0B;background:#FFFBEB;color:#92400E}
.paper-opt.right{border-color:#10B981;background:#ECFDF5;color:#065F46}
.answer-strip{display:flex;flex-wrap:wrap;gap:6px;margin-top:10px}
.note-box{background:#F8FAFC;padding:9px;border-radius:9px}

/* 深色主题 */
:root[data-theme="dark"]{--primary:#818CF8;--primary-2:#A78BFA;--success:#34D399;--warn:#FBBF24;--danger:#F87171;--bg:#0F172A;--card:#1E293B;--text:#E2E8F0;--muted:#94A3B8;--line:#334155;--shadow:0 4px 18px rgba(0,0,0,.35)}
:root[data-theme="dark"] html,:root[data-theme="dark"] body{background:#0B1220}
:root[data-theme="dark"] #app{background:var(--bg);box-shadow:0 0 40px rgba(0,0,0,.5)}
:root[data-theme="dark"] .card,:root[data-theme="dark"] .question,:root[data-theme="dark"] .stat,:root[data-theme="dark"] .auth-card{background:var(--card)}
:root[data-theme="dark"] .tabbar{background:#1E293B}
:root[data-theme="dark"] .input,:root[data-theme="dark"] select.input,:root[data-theme="dark"] textarea.input{background:#0B1220;color:var(--text);border-color:var(--line)}
:root[data-theme="dark"] .input:focus{background:#0B1220}
:root[data-theme="dark"] .option{background:#1E293B;border-color:var(--line)}
:root[data-theme="dark"] .option.sel{background:#312E81;border-color:var(--primary);color:#C7D2FE}
:root[data-theme="dark"] .chip,:root[data-theme="dark"] .btn.soft{background:#334155;color:var(--text)}
:root[data-theme="dark"] .btn.ghost,:root[data-theme="dark"] .btn.outline{background:#312E81;color:#C7D2FE}
:root[data-theme="dark"] .fold,:root[data-theme="dark"] .note-box,:root[data-theme="dark"] .md blockquote{background:#0B1220}
:root[data-theme="dark"] .paper-opt{background:#0B1220;border-color:var(--line)}
:root[data-theme="dark"] .subject-card{background:#1E293B;border-color:var(--line)}
:root[data-theme="dark"] .subject-card.on{background:#312E81;color:#C7D2FE}
:root[data-theme="dark"] .result-ring{background:conic-gradient(var(--primary) 0 var(--deg),#334155 var(--deg) 100%)}
:root[data-theme="dark"] .result-ring .inner{background:#1E293B}
:root[data-theme="dark"] .toggle{background:#475569}
:root[data-theme="dark"] .progress{background:#334155}