:root{color-scheme:light;--ink:#222b3b;--muted:#727b8c;--line:#e8ebf0;--accent:#4266cf;--soft:#edf2ff;font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei",sans-serif;font-size:16px;color:var(--ink);background:#fff}
*{box-sizing:border-box}body{margin:0;line-height:1.6}button,input,textarea,select{font:inherit;color:inherit}button{cursor:pointer}button:disabled{opacity:.5;cursor:wait}button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible{outline:3px solid #9bb1f4;outline-offset:3px}[hidden]{display:none!important}a{text-decoration:none;color:inherit}.sidebar{position:fixed;inset:0 auto 0 0;width:244px;background:#f7f8fb;border-right:1px solid var(--line);display:flex;flex-direction:column;padding:30px 20px}.brand{display:flex;align-items:center;gap:10px;font-size:21px;font-weight:700;letter-spacing:-.7px}.brand-mark{display:grid;place-items:center;background:var(--accent);color:white;width:30px;height:30px;border-radius:9px;font-size:18px}.private-mark{font-size:12px;font-weight:400;color:var(--muted);letter-spacing:0;margin-left:auto}.nav-caption{font-size:12px;color:var(--muted);margin:48px 12px 14px}.area-title{display:flex;align-items:center;gap:12px;font-weight:650;padding:8px 12px;margin-bottom:12px;color:var(--accent)}.area-title span{color:var(--ink)}.sidebar nav{display:grid;gap:5px}.sidebar nav button{display:flex;justify-content:space-between;align-items:center;width:100%;border:0;background:transparent;border-radius:7px;padding:10px 13px 10px 42px;text-align:left;font-size:14px;color:#586275}.sidebar nav button:hover{background:#eef0f5}.sidebar nav button[aria-current]{background:#e9eefd;color:#3458be;font-weight:600}.sidebar nav small{font-size:12px}.sidebar-bottom{margin-top:auto;display:grid;gap:13px;font-size:14px;color:var(--muted)}.sidebar-bottom>a{padding-left:12px}.account{border-top:1px solid var(--line);padding-top:18px;display:flex;gap:8px;align-items:center;font-size:12px}.account span{overflow:hidden;text-overflow:ellipsis}.account button{border:0;background:none;white-space:nowrap;font-size:14px}
main{margin-left:244px;padding:0 clamp(24px,5vw,84px);max-width:1600px;min-height:100vh}.topline{display:flex;justify-content:space-between;gap:16px;border-bottom:1px solid var(--line);padding:25px 0;color:var(--muted);font-size:14px}.page-head{display:flex;justify-content:space-between;align-items:center;gap:20px;padding:46px 0 30px}h1{font-size:30px;line-height:1.25;letter-spacing:-.7px;margin:0 0 10px;font-weight:650}.page-head p{margin:0;color:var(--muted);font-size:14px}.primary{border:1px solid var(--accent)!important;border-radius:7px;background:var(--accent)!important;color:#fff!important;padding:10px 16px;white-space:nowrap;font-size:14px}.toolbar{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-bottom:22px}.search{display:flex;align-items:center;gap:10px;max-width:400px;flex:1;border:1px solid var(--line);border-radius:7px;padding:7px 12px}.search>span{font-size:23px;color:var(--muted);line-height:1}.search input{width:100%;border:0;background:none;font-size:14px;min-width:0}.search kbd{font-size:12px;color:#99a2b2}.group{margin:0 0 30px}.group-heading{display:flex;gap:10px;align-items:center;border-bottom:1px solid var(--line);padding:8px 0 11px;margin:0;font-size:14px;font-weight:600}.group-heading small{background:#f1f3f7;border-radius:4px;padding:0 6px;color:var(--muted);font-size:12px;font-weight:400}.task-row{display:flex;align-items:flex-start;gap:13px;padding:17px 4px;border-bottom:1px solid #f0f2f5}.task-row:hover{background:#fafbfe}.task-check{width:19px;height:19px;margin-top:5px;accent-color:var(--accent);flex-shrink:0;cursor:pointer}.task-body{flex:1;min-width:0}.task-title{border:0;background:none;padding:0;text-align:left;font-size:16px;overflow-wrap:anywhere}.task-title:hover{color:var(--accent)}.task-meta{display:flex;flex-wrap:wrap;gap:8px 14px;margin-top:5px;font-size:14px;color:var(--muted)}.deadline{color:#986023}.overdue{color:#b84949}.task-row.done .task-title{text-decoration:line-through;color:#8a93a3}.task-open{border:0;background:none;color:#9ca5b4;font-size:20px;padding:0 6px}.empty{padding:58px 18px;text-align:center;color:var(--muted);font-size:14px;border:1px dashed var(--line);border-radius:8px}.empty strong{display:block;color:#465168;font-size:17px;font-weight:500;margin-bottom:8px}.record-card{padding:21px 0;border-bottom:1px solid var(--line)}.record-card h3{margin:0;font-size:16px}.record-card p{margin:9px 0;white-space:pre-wrap;overflow-wrap:anywhere;color:#626d7f}.record-top{display:flex;justify-content:space-between;gap:16px}.record-top button{border:0;background:none;color:var(--accent);font-size:14px}.record-card time{color:var(--muted);font-size:12px}footer{display:flex;justify-content:space-between;gap:16px;margin-top:40px;padding:20px 0 28px;border-top:1px solid var(--line);font-size:12px;color:#959eac}#mobile-sign-out{display:none}#status:empty{display:none}#status{color:#b84949;font-size:14px}.notice{background:#fff6df;border:1px solid #f1e0b2;border-radius:7px;padding:10px 14px;font-size:14px;color:#80642a}
dialog{width:min(580px,calc(100% - 32px));border:1px solid var(--line);border-radius:12px;padding:26px;box-shadow:0 22px 80px #18234325;max-height:90vh;overflow:auto}dialog::backdrop{background:#1b253755}dialog header{display:flex;justify-content:space-between;align-items:center;margin-bottom:22px}dialog h2{margin:0;font-size:21px}dialog header button{border:0;background:none;font-size:26px;color:var(--muted)}#editor-fields{display:grid;gap:16px}#editor-fields label{display:grid;gap:6px;font-size:14px;color:#626d7f}#editor-fields input,#editor-fields textarea{width:100%;border:1px solid #dfe3eb;border-radius:6px;padding:10px 12px;background:#fff;font-size:16px}#editor-fields textarea{resize:vertical;min-height:110px}.date-fields{display:grid;grid-template-columns:1fr 1fr;gap:14px}.field-hint{font-size:12px;color:var(--muted);margin:0}.dialog-footer{display:flex;gap:10px;margin-top:24px}.dialog-footer span{flex:1}.dialog-footer button{padding:9px 14px;background:white;border:1px solid var(--line);border-radius:6px;font-size:14px}.dialog-footer .danger{color:#b84949;border:0;padding-left:0}#editor-error{color:#b84949;font-size:14px}
@media(max-width:900px){.sidebar{width:205px;padding:25px 14px}main{margin-left:205px;padding:0 24px}.toolbar{align-items:stretch;flex-direction:column;gap:10px}.search{max-width:none}}
@media(max-width:600px){.sidebar{position:static;width:100%;padding:18px 18px 10px;border-right:0;border-bottom:1px solid var(--line)}.brand{font-size:19px}.nav-caption,.area-title,.sidebar-bottom{display:none}.sidebar nav{display:flex;overflow-x:auto;gap:5px;margin-top:16px}.sidebar nav button{width:auto;flex-shrink:0;padding:8px 10px;gap:8px}.sidebar nav small{display:none}main{margin-left:0;padding:0 20px}.topline{padding:15px 0;font-size:12px}.page-head{padding:28px 0 22px}h1{font-size:26px}.page-head p{max-width:220px}.primary{padding:9px 12px}.date-fields{grid-template-columns:1fr}.dialog-footer{gap:6px}.dialog-footer button{padding:8px 10px}.task-row{padding-block:16px}#mobile-sign-out{display:block;border:0;background:none;color:var(--muted);font-size:14px}}
.task-description{margin:4px 0 0;color:var(--muted);font-size:14px;line-height:1.55;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.study-navigation>summary{display:flex;cursor:pointer;list-style:none;border-radius:7px;user-select:none}
.study-navigation>summary::-webkit-details-marker{display:none}
.study-navigation>summary:hover{background:#eef0f5}
.study-navigation>summary:focus-visible{outline:3px solid #9bb1f4;outline-offset:3px}
.nav-chevron{flex:none;transition:transform .15s ease}
.study-navigation[open] .nav-chevron{transform:rotate(90deg)}
.study-navigation:not([open])>nav{display:none}
@media(max-width:600px){.study-navigation{margin-top:12px}.study-navigation>summary{margin-bottom:0}.study-navigation nav{margin-top:6px}}
@media(prefers-reduced-motion:reduce){.nav-chevron{transition:none}}
/* A quieter working surface, with larger interaction targets. */
.study-navigation{margin-top:32px}.topline{justify-content:flex-end;padding:18px 0;border:0}.page-head{padding:20px 0 24px}.toolbar{margin-bottom:12px}.task-row{padding:0;gap:4px;align-items:stretch}.check-hit{display:flex;justify-content:center;align-items:flex-start;min-width:44px;padding-top:19px;cursor:pointer}.task-check{margin:0;width:20px;height:20px}.task-body{display:block;border:0;background:none;text-align:left;padding:15px 12px 15px 0;min-height:60px;width:100%;color:inherit}.task-title,.task-description{display:block}.task-meta:empty{display:none}.task-meta{gap:6px 18px}.scope-label{color:var(--accent)}.group{margin-bottom:22px}.record-top button{min-width:44px;min-height:44px}.field-hint{font-size:14px}#feedback:empty,#draft-status:empty{display:none}#feedback{font-size:14px;color:var(--accent)}.dialog-footer{flex-wrap:wrap}dialog header button{min-width:44px;min-height:44px}#draft-status{margin-top:14px}.task-body:focus-visible{outline-offset:-3px;border-radius:6px}
@media(max-width:600px){.study-navigation{margin-top:10px}.topline{padding:12px 0 0}.page-head{padding:18px 0}.page-head p{max-width:none}.page-head{align-items:flex-start;flex-wrap:wrap}.check-hit{min-width:44px}.task-body{padding-right:4px}.sidebar nav button{min-height:44px}.dialog-footer span{display:none}.dialog-footer{justify-content:flex-end}.dialog-footer .danger{margin-right:auto}}
#status{display:flex;align-items:center;gap:10px}.status-retry{border:1px solid currentColor;border-radius:6px;background:#fff;color:inherit;padding:4px 10px;font-size:13px}
.page-head p:empty{display:none}.mobile-history{display:none}#view-title:focus-visible{outline:3px solid #9bb1f4;outline-offset:5px;border-radius:3px}
@media(max-width:600px){footer>a:first-child,#footer-count{display:none}.mobile-history{display:block;margin-left:auto}footer{justify-content:flex-end;align-items:center;gap:20px}.study-navigation>summary{min-height:44px}.study-navigation:not([open])>summary{margin-bottom:0}}