:root{--bg:#f5f4f0;--card:#fff;--ink:#222;--muted:#7a7a7a;--line:#e6e3dc;--pri:#12936a;--pri-soft:#e3f4ec;--bad:#d9453b;--bad-soft:#fdeceb}
*{box-sizing:border-box;margin:0;padding:0;-webkit-tap-highlight-color:transparent}
html,body{background:var(--bg);color:var(--ink);font:15px/1.6 -apple-system,BlinkMacSystemFont,"PingFang SC","Helvetica Neue",sans-serif}
button,select,input{font:inherit;color:inherit}
button{background:none;border:0;cursor:pointer}
.hidden{display:none!important}
.muted{color:var(--muted)}.small{font-size:12px}.center{text-align:center}
.row{display:flex;align-items:center;gap:8px}.between{justify-content:space-between}
h1{font-size:26px;letter-spacing:2px}h2{font-size:17px;margin-bottom:6px}h3{font-size:14px;margin:12px 0 2px}

.screen{max-width:520px;margin:0 auto;min-height:100vh;padding:0 16px calc(24px + env(safe-area-inset-bottom))}
.card{background:var(--card);border-radius:14px;padding:16px;margin:12px 0;box-shadow:0 1px 3px rgba(0,0,0,.04)}
.btn{display:block;width:100%;padding:13px;border-radius:12px;font-weight:600;margin:12px 0}
.btn.primary{background:var(--pri);color:#fff}
.btn.line{border:1px solid var(--pri);color:var(--pri);background:#fff}
.btn.small{display:inline-block;width:auto;padding:6px 14px;margin:6px 0;font-size:13px;font-weight:500}
.link{color:var(--pri);padding:8px 4px}

/* 解锁 */
#gate{display:flex;align-items:center;padding:16px}
.gate{width:100%;text-align:center;padding:36px 22px}
.logo{display:grid;grid-template-columns:repeat(7,12px);gap:4px;justify-content:center;margin-bottom:14px}
.logo i{width:12px;height:12px;border-radius:50%;background:#b8a14a}
.logo i:nth-child(2n){background:#d08a3c}.logo i:nth-child(3n){background:#8fa34a}
.gate p{margin-top:6px}
#code{width:180px;margin:24px auto 4px;display:block;text-align:center;font-size:30px;letter-spacing:14px;padding:10px;border:0;border-bottom:2px solid var(--line);background:none;outline:none}
#code:focus{border-color:var(--pri)}
.err{color:var(--bad);font-size:13px;visibility:hidden}.err.show{visibility:visible;animation:shake .3s}
@keyframes shake{25%{transform:translateX(-6px)}75%{transform:translateX(6px)}}

/* 顶部导航:网页没有原生 tabBar,底部固定栏会和浏览器工具栏、小红书内置浏览器的底栏抢位置 */
.topnav{position:sticky;top:0;z-index:5;display:flex;margin:0 -16px 12px;padding:calc(6px + env(safe-area-inset-top)) 8px 0;background:rgba(245,244,240,.94);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.topnav button{flex:1;padding:10px 0 9px;color:var(--muted);border-bottom:2px solid transparent;font-size:15px}
.topnav button.on{color:var(--ink);font-weight:600;border-color:var(--pri)}
.tab{padding-top:4px}
#app.focus{padding-top:calc(16px + env(safe-area-inset-top))}

/* 通用控件 */
.mistakes-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:4px}
.pill{position:relative;background:#fff;border-radius:20px;padding:5px 12px;font-size:14px;font-weight:600}
.pill i{font-style:normal;color:var(--muted);margin-left:4px;font-size:12px}
.pill select{position:absolute;inset:0;width:100%;opacity:0;font-size:16px}
.star{font-size:24px;color:#c9a227;padding:2px 6px}
.plate{background:#fff;border-radius:12px;overflow:hidden;margin:10px 0 4px;box-shadow:0 1px 3px rgba(0,0,0,.05)}
.plate canvas{display:block;width:100%;aspect-ratio:3/2;touch-action:pan-y;-webkit-user-select:none;user-select:none;-webkit-touch-callout:none}
.hint{font-size:12px;color:var(--muted);text-align:center}
.toolbar{display:flex;gap:8px;margin:10px 0}
.toolbar button{flex:1;padding:8px 4px;border-radius:9px;background:#fff;border:1px solid var(--line);white-space:nowrap}
.toolbar button.on{border-color:var(--pri);color:var(--pri);background:var(--pri-soft)}
.assist{display:flex;align-items:center;gap:12px;margin:6px 0}
.assist span{font-size:13px;color:var(--muted);white-space:nowrap}
.assist input{flex:1;accent-color:var(--pri)}
.answer{margin:10px 0}
.mask{width:100%;padding:18px;border-radius:12px;background:repeating-linear-gradient(45deg,#ecebe6 0 8px,#f3f2ee 8px 16px);color:var(--muted)}
.revealed,.analysis-box{background:#fff;border-radius:12px;padding:14px}
.ans{font-size:16px}.ans b{color:var(--pri);font-size:20px}
.analysis{font-size:13px;color:var(--muted);margin:4px 0}
.self{display:flex;gap:10px;margin-top:8px}
.self button{flex:1;padding:9px;border-radius:9px;border:1px solid var(--line)}
.self .ok.sel{background:var(--pri-soft);border-color:var(--pri);color:var(--pri)}
.self .bad.sel{background:var(--bad-soft);border-color:var(--bad);color:var(--bad)}
.pager{display:flex;gap:10px;margin-top:12px}
.pager button{flex:1;padding:11px;border-radius:10px;background:#fff;border:1px solid var(--line);color:var(--pri)}

.options{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin:12px 0}
.options button{padding:13px 4px;border-radius:10px;background:#fff;border:1px solid var(--line);font-size:16px}
.options button.correct{background:var(--pri-soft);border-color:var(--pri);color:var(--pri);font-weight:600}
.options button.wrong{background:var(--bad-soft);border-color:var(--bad);color:var(--bad)}
.feedback{min-height:24px;text-align:center;color:var(--pri);font-weight:600}
.feedback.tip{color:var(--muted);font-weight:400;font-size:13px}
.empty{text-align:center;padding:60px 20px;color:var(--muted)}

/* 测试 */
.progress{display:flex;align-items:center;gap:10px;font-size:13px;color:var(--muted)}
.progress .link{padding:0 0 0 4px;color:var(--muted)}
.progress i{flex:1;height:6px;background:#e6e3dc;border-radius:3px;overflow:hidden}
.progress b{display:block;height:100%;background:var(--pri);transition:width .3s}
.countdown{text-align:center;font-size:14px;color:var(--muted);margin-top:8px}
.countdown b{font-size:34px;color:var(--ink);font-variant-numeric:tabular-nums}
.countdown.urgent b{color:var(--bad)}
.stats{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:8px 0 12px}
.stats.three{grid-template-columns:repeat(3,1fr)}
.stats div{background:#fff;border-radius:12px;padding:14px 6px;text-align:center}
.stats b{display:block;font-size:22px}.stats small{color:var(--muted);font-size:12px}

/* 我的 */
.count{font-size:13px;color:var(--bad);font-weight:500}
.list{list-style:none}
.list li{padding:10px 0;border-top:1px solid #f0eee8;font-size:14px;cursor:pointer}
.list li small{display:block;margin-top:2px}
.list li:first-child{border-top:0}
.list li small{color:var(--muted)}
.list .none{color:var(--muted);cursor:default;font-size:13px}
details summary{font-weight:600;cursor:pointer}
details p{font-size:13px;color:#555}


.overlay{position:fixed;inset:0;background:rgba(0,0,0,.45);display:flex;align-items:center;justify-content:center;padding:24px;z-index:10}
.overlay .card{max-width:420px;width:100%}
.overlay p{font-size:14px;margin:6px 0}
.toast{position:fixed;left:50%;bottom:calc(60px + env(safe-area-inset-bottom));transform:translateX(-50%);background:rgba(0,0,0,.78);color:#fff;padding:8px 16px;border-radius:20px;font-size:14px;opacity:0;pointer-events:none;transition:opacity .2s;z-index:20}
.toast.show{opacity:1}