:root{--ink:#13233b;--ink-2:#43526a;--paper:#fffdf8;--canvas:#eef3f7;--line:#dbe3eb;--blue:#2d67d4;--coral:#ef654f;--gold:#d89b2b;--mint:#1f9d7a;--shadow:0 24px 70px rgba(24,42,67,.1)}
*{box-sizing:border-box}
body{margin:0;min-height:100vh;background:var(--canvas);color:var(--ink);font-family:"Microsoft YaHei UI","Microsoft YaHei",sans-serif}
button,a,textarea{font:inherit}
button,a{-webkit-tap-highlight-color:transparent}
.translation-topbar{height:76px;padding:0 24px;display:grid;grid-template-columns:1fr minmax(260px,430px) 1fr;align-items:center;background:rgba(255,255,255,.94);border-bottom:1px solid var(--line);backdrop-filter:blur(14px);position:sticky;top:0;z-index:20}
.translation-brand{display:flex;align-items:center;gap:12px;color:var(--ink);text-decoration:none;width:max-content}.translation-brand>b{display:grid;place-items:center;width:40px;height:40px;border-radius:12px;background:var(--ink);color:#fff;letter-spacing:.04em}.translation-brand span{display:block}.translation-brand strong,.translation-brand small{display:block}.translation-brand small{margin-top:2px;color:#7b8798;font:11px/1.2 Georgia,serif;letter-spacing:.08em;text-transform:uppercase}
.translation-progress-summary{display:grid;grid-template-columns:auto 1fr;align-items:center;gap:14px;color:#66758a;font-size:12px;font-weight:800}.translation-progress-summary i{display:block;height:5px;background:#e4eaf1;border-radius:999px;overflow:hidden}.translation-progress-summary em{display:block;width:0;height:100%;background:linear-gradient(90deg,var(--blue),#5c8ee9);border-radius:inherit;transition:width .3s ease}
.topbar-exit{justify-self:end;color:var(--ink);font-size:13px;font-weight:800;text-decoration:none;padding:10px 14px;border:1px solid var(--line);border-radius:10px;background:#fff}.topbar-exit:hover{border-color:#b5c4d6}
.translation-layout{width:min(1580px,calc(100% - 28px));margin:14px auto;display:grid;grid-template-columns:270px minmax(500px,1fr) 260px;gap:14px;align-items:start;min-height:calc(100vh - 104px)}
.sentence-rail,.translation-workbench,.session-panel{background:#fff;border:1px solid var(--line);border-radius:20px;box-shadow:0 4px 24px rgba(31,48,73,.035)}
.sentence-rail{padding:22px;display:flex;flex-direction:column;min-height:0;height:calc(100vh - 104px);position:sticky;top:90px}.rail-heading{display:flex;justify-content:space-between;align-items:flex-start;gap:12px}.eyebrow{display:block;color:var(--coral);font:800 10px/1.2 Georgia,serif;letter-spacing:.15em}.rail-heading h1,.session-panel h2{margin:6px 0 0;font-family:Georgia,"Songti SC",serif}.rail-heading h1{font-size:24px}.quiet-button{border:0;background:#f1f5f9;color:#53637a;border-radius:9px;padding:8px 9px;font-size:11px;font-weight:800;cursor:pointer}.quiet-button:hover{background:#e5edf6;color:var(--blue)}
.rail-legend{display:flex;gap:13px;margin:18px 0 12px;color:#7b8798;font-size:10px}.rail-legend span{display:flex;align-items:center;gap:5px}.rail-legend i{width:7px;height:7px;border-radius:50%;background:#d8e0e9}.rail-legend i.answered{background:var(--blue)}.rail-legend i.mastered{background:var(--mint)}
.sentence-map{display:grid;grid-template-columns:repeat(5,1fr);gap:6px;align-content:start;overflow:auto;padding:2px 4px 12px 2px}.sentence-map button{aspect-ratio:1;border:1px solid #e0e6ed;background:#fafbfd;color:#718096;border-radius:8px;font:700 11px/1 Georgia,serif;cursor:pointer;position:relative;transition:transform .15s ease,border-color .15s ease,background .15s ease}.sentence-map button:hover{transform:translateY(-1px);border-color:#9fb4cf}.sentence-map button.answered{background:#eef4ff;border-color:#c9d9f5;color:var(--blue)}.sentence-map button.mastered{background:#eaf8f3;border-color:#a9ddcd;color:#16765c}.sentence-map button.current{background:var(--ink);border-color:var(--ink);color:#fff;box-shadow:0 5px 14px rgba(19,35,59,.2)}.sentence-map button.revealed:after{content:"";position:absolute;right:3px;top:3px;width:4px;height:4px;background:var(--gold);border-radius:50%}
.rail-note{margin-top:auto;padding-top:18px;border-top:1px solid #edf0f4}.rail-note strong,.rail-note span{display:block}.rail-note strong{font-size:11px}.rail-note span{margin-top:6px;color:#7d8998;font-size:10px;line-height:1.55}
.translation-workbench{padding:clamp(24px,3vw,46px);display:flex;flex-direction:column;min-height:calc(100vh - 104px);position:relative;overflow:hidden}.translation-workbench:before{content:"";position:absolute;width:260px;height:260px;border-radius:50%;right:-130px;top:-150px;background:radial-gradient(circle,rgba(45,103,212,.11),transparent 68%);pointer-events:none}.workbench-head{display:flex;justify-content:space-between;align-items:center;gap:16px}.workbench-head>div{display:flex;align-items:center;gap:12px}.source-page{color:#8490a1;font:700 10px/1 Georgia,serif;letter-spacing:.08em}.mastery-button{border:1px solid #dce5e2;background:#fff;color:#60706d;border-radius:999px;padding:9px 13px;font-size:11px;font-weight:800;cursor:pointer}.mastery-button span{color:var(--mint);font-size:15px;vertical-align:-1px}.mastery-button.active{background:#eaf8f3;border-color:#a9ddcd;color:#16765c}.mastery-button.active span:before{content:"◆"}.mastery-button.active span{font-size:0}.mastery-button.active span:before{font-size:13px}
.prompt-card{margin:32px 0 24px;padding:34px 36px;background:var(--paper);border:1px solid #e7e0d3;border-radius:18px;position:relative;box-shadow:0 15px 40px rgba(59,45,25,.06)}.prompt-card:before{content:"“";position:absolute;left:18px;top:2px;color:#ebdfca;font:64px/1 Georgia,serif}.prompt-label{display:block;color:#9a8562;font-size:10px;font-weight:900;letter-spacing:.12em}.prompt-card p{margin:18px 0 0;font-family:Georgia,"Noto Serif SC","Songti SC",serif;font-size:clamp(24px,2.25vw,36px);line-height:1.55;letter-spacing:.01em}
.answer-block{border:1px solid var(--line);border-radius:17px;overflow:hidden;background:#fff}.answer-heading,.answer-meta{display:flex;justify-content:space-between;align-items:center}.answer-heading{padding:14px 18px;border-bottom:1px solid #e8edf2}.answer-heading label{font-size:12px;font-weight:900}.answer-heading span,.answer-meta{color:#8490a0;font-size:10px}.answer-block textarea{display:block;width:100%;min-height:170px;padding:22px;border:0;outline:0;resize:vertical;color:#17233a;font:18px/1.8 Georgia,"Times New Roman",serif}.answer-block textarea::placeholder{color:#aeb8c5}.answer-block:focus-within{border-color:#a9bfdf;box-shadow:0 0 0 3px rgba(45,103,212,.07)}.answer-meta{padding:11px 16px;border-top:1px solid #edf0f4}.answer-meta kbd{padding:2px 5px;border:1px solid #d9e0e8;border-bottom-width:2px;border-radius:4px;background:#f7f9fb;color:#647287;font-size:9px}
.reference-panel{margin-top:16px;display:grid;grid-template-columns:42px 1fr;gap:15px;padding:20px 22px;background:#edf9f5;border:1px solid #bfe4d7;border-radius:16px;animation:reference-in .22s ease-out}.reference-panel[hidden]{display:none}.reference-mark{display:grid;place-items:center;width:42px;height:42px;border-radius:50%;background:var(--mint);color:#fff;font:bold 22px/1 Georgia,serif}.reference-panel .eyebrow{color:#28836b}.reference-panel p{margin:8px 0 0;color:#164f41;font:18px/1.65 Georgia,"Times New Roman",serif}@keyframes reference-in{from{opacity:0;transform:translateY(7px)}to{opacity:1;transform:none}}
.workbench-actions{margin-top:auto;padding-top:24px;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:12px}.workbench-actions button{min-height:46px;border-radius:12px;font-size:12px;font-weight:900;cursor:pointer}.nav-button{border:1px solid var(--line);background:#fff;color:#526178;justify-self:start;padding:0 18px}.nav-button.next{justify-self:end}.nav-button:hover:not(:disabled){border-color:#aebed1;color:var(--ink)}.nav-button:disabled{opacity:.35;cursor:not-allowed}.reveal-button{border:0;background:var(--ink);color:#fff;padding:0 28px;box-shadow:0 10px 24px rgba(19,35,59,.16)}.reveal-button:hover{background:#203657}.reveal-button.is-visible{background:#e9eef4;color:#4f6077;box-shadow:none}
.session-panel{padding:24px;align-self:start;position:sticky;top:90px}.session-panel h2{font-size:24px;line-height:1.25}.session-ring{--progress:0deg;width:148px;height:148px;margin:28px auto;display:grid;place-items:center;border-radius:50%;background:conic-gradient(var(--blue) var(--progress),#e7edf3 0);position:relative}.session-ring:before{content:"";position:absolute;inset:11px;background:#fff;border-radius:50%}.session-ring div{position:relative;text-align:center}.session-ring strong{font:700 42px/1 Georgia,serif}.session-ring span{color:#8995a5;font:13px/1 Georgia,serif}.session-panel dl{margin:0;border-top:1px solid #e6ebf0}.session-panel dl div{display:flex;justify-content:space-between;padding:13px 2px;border-bottom:1px solid #edf0f3}.session-panel dt{color:#748195;font-size:11px}.session-panel dd{margin:0;font:700 15px/1 Georgia,serif}.session-panel p{margin:20px 0 0;color:#7b8798;font-size:11px;line-height:1.7}
.translation-error{width:min(600px,calc(100% - 32px));margin:40px auto;padding:24px;border:1px dashed #c8d1dc;border-radius:14px;text-align:center;color:#69788d;background:#fff}
@media(max-width:1180px){.translation-layout{grid-template-columns:230px minmax(460px,1fr)}.session-panel{display:none}.sentence-map{grid-template-columns:repeat(5,1fr)}}
@media(max-width:820px){.translation-topbar{grid-template-columns:1fr auto;height:68px;padding:0 14px}.translation-progress-summary{display:none}.translation-layout{display:flex;flex-direction:column;width:calc(100% - 16px);margin:8px auto}.sentence-rail{padding:14px;order:2;position:static;height:auto;width:100%}.sentence-map{display:flex;width:100%;overflow-x:auto}.sentence-map button{flex:0 0 38px}.rail-note,.rail-legend{display:none}.translation-workbench{min-height:calc(100vh - 84px);padding:22px}.prompt-card{margin:24px 0 18px;padding:28px 24px}.prompt-card p{font-size:25px}.answer-block textarea{min-height:150px}.workbench-actions{grid-template-columns:1fr 1fr}.reveal-button{grid-column:1/-1;grid-row:1}.nav-button,.nav-button.next{width:100%;justify-self:stretch}.rail-heading{align-items:center}.rail-heading h1{font-size:19px}}
@media(max-width:520px){.translation-brand small{display:none}.topbar-exit{padding:8px 10px}.workbench-head{align-items:flex-start}.workbench-head>div{display:block}.source-page{display:block;margin-top:6px}.mastery-button{padding:8px 10px}.prompt-card p{font-size:22px}.answer-meta span:first-child{display:none}.reference-panel{grid-template-columns:32px 1fr}.reference-mark{width:32px;height:32px}.reference-panel p{font-size:16px}}