:root{--ink:#172b3f;--muted:#667789;--line:#d9e1e8;--soft:#f5f7f9;--blue:#1769aa;--green:#13775b;--orange:#b65d18;--red:#b83b3b}*{box-sizing:border-box}html{background:#f6f8fa}body{min-height:100vh;color:var(--ink);background:#f6f8fa;margin:0;font-family:Inter,Segoe UI,Microsoft YaHei UI,Noto Sans CJK SC,Arial,sans-serif}button,input{font:inherit}button{color:inherit}button:focus-visible,a:focus-visible{outline-offset:2px;outline:3px solid #1769aa38}.app-shell{min-height:100vh}.topbar{justify-content:space-between;align-items:center;width:min(960px,100% - 32px);height:64px;margin:0 auto;display:flex}.brand{color:inherit;align-items:center;gap:10px;text-decoration:none;display:inline-flex}.brand-mark{color:#fff;background:var(--blue);border-radius:8px;place-items:center;width:34px;height:34px;font-size:12px;font-weight:800;display:grid}.brand strong{font-size:14px}.language-switch{border:1px solid 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