/* 做题工作台：左侧题目/题解/AI/笔记/提交记录，右侧代码沙箱（参考力扣的分栏布局） */
body.ws-on{overflow:hidden;background:#eef2f6}
body.ws-on .sidebar,body.ws-on .footer,body.ws-on .mobile-bar{display:none}
body.ws-on main{max-width:none;margin:0;padding:0;min-height:0}
.ws{display:flex;flex-direction:column;height:100vh;height:100dvh;color:var(--ink)}
.ws button{font:inherit;cursor:pointer}
.ws :focus-visible{outline:2px solid #3b82f6;outline-offset:1px}

/* 顶栏 */
.ws-top{flex:none;display:flex;align-items:center;gap:10px;height:48px;padding:0 14px;background:#fff;border-bottom:1px solid var(--line)}
.ws-home{display:inline-flex;align-items:center;gap:6px;color:var(--ink);font-weight:700;font-size:14px;text-decoration:none;white-space:nowrap}
.ws-home span:first-child{color:var(--green);font-size:16px}
.ws-step{display:inline-flex;border:1px solid var(--line);border-radius:7px;overflow:hidden}
.ws-step a,.ws-step span{display:inline-grid;place-items:center;width:30px;height:28px;font-size:18px;line-height:1;color:var(--ink);text-decoration:none}
.ws-step a+a,.ws-step a+span,.ws-step span+a{border-left:1px solid var(--line)}
.ws-step span{color:#c3ccd6}
.ws-step a:hover{background:#f3f6f9}
.ws-crumb{min-width:0;font-size:13px;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.ws-crumb a{color:var(--muted)}
.ws-crumb a:hover{color:var(--green)}
.ws-acts{margin-left:auto;display:flex;align-items:center;gap:6px}
.ws-acts button,.ws-lc{height:30px;padding:0 11px;border:1px solid var(--line);border-radius:7px;background:#fff;color:var(--ink);font-size:13px;white-space:nowrap;display:inline-flex;align-items:center;text-decoration:none}
.ws-acts button:hover,.ws-lc:hover{background:#f5f8fb}
.ws-done[aria-pressed=true]{background:var(--pale);border-color:#b9e3cf;color:var(--green);font-weight:600}
.ws-star{width:32px;justify-content:center;padding:0!important;font-size:16px!important}
.ws-star[aria-pressed=true]{color:#d99a06}
.ws-switch{display:none}

/* 分栏 */
.ws-body{flex:1;min-height:0;display:grid;grid-template-columns:minmax(0,var(--ws-left,46%)) 8px minmax(0,1fr);padding:8px}
.ws-body.dragging{cursor:col-resize;user-select:none}
.ws-body.dragging iframe,.ws-body.dragging .cm-editor{pointer-events:none}
.ws-left,.ws-right{min-width:0;min-height:0;display:flex;flex-direction:column;background:#fff;border:1px solid var(--line);border-radius:10px;overflow:hidden}
.ws-split{position:relative;cursor:col-resize;touch-action:none}
.ws-split::after{content:"";position:absolute;top:50%;left:3px;width:2px;height:28px;margin-top:-14px;border-radius:2px;background:#c9d4df;transition:background .15s,height .15s}
.ws-split:hover::after,.ws-split:focus-visible::after,.ws-body.dragging .ws-split::after{background:var(--green);height:56px;margin-top:-28px}
.ws-split:focus-visible{outline:0}

/* 左侧标签 */
.ws-tabbar{flex:none;display:flex;align-items:center;border-bottom:1px solid var(--line);background:#fafcfd}
.ws-tabs{flex:1;min-width:0;display:flex;gap:2px;height:40px;padding:0 8px;overflow-x:auto;scrollbar-width:none}
.ws-wide{flex:none;margin:0 8px 0 4px;height:28px;padding:0 10px;border:1px solid var(--line);border-radius:6px;background:#fff;color:var(--muted);font-size:12.5px;font-weight:600;white-space:nowrap;cursor:pointer}
.ws-wide:hover{color:var(--ink);border-color:#b8c6d4}
.ws-wide[aria-pressed=true]{color:#0f7a55;background:#effaf5;border-color:#bfe6d4}
.ws-body.ws-anim{transition:grid-template-columns .3s ease}
.ws-tabs::-webkit-scrollbar{display:none}
.ws-tabs [role=tab]{flex:none;height:40px;padding:0 12px;border:0;border-bottom:2px solid transparent;background:none;color:var(--muted);font-size:13.5px;font-weight:600;white-space:nowrap}
.ws-tabs [role=tab]:hover{color:var(--ink)}
.ws-tabs [role=tab][aria-selected=true]{color:var(--ink);border-bottom-color:var(--green)}
.ws-tabs [data-tab=ai]::before{content:"✦ ";color:#7c5cd6}
.ws-panes{flex:1;min-height:0;position:relative}
.ws-pane{position:absolute;inset:0;overflow:auto;padding:20px 24px 32px;overscroll-behavior:contain}
.ws-pane[hidden]{display:none}
.ws-pane:focus-visible{outline:0}

/* 描述 */
.ws-head h1{margin:0 0 10px;font-size:21px;line-height:1.35;letter-spacing:0}
.ws-head .tags{gap:10px;margin-bottom:18px}
.ws-head .tags span{padding:1px 9px;border-radius:999px;background:#f1f5f8}
.ws-head .tags .difficulty.easy{background:#e8f6f0}
.ws-head .tags .difficulty.medium{background:#fdf3e2}
.ws-head .tags .difficulty.hard{background:#fbeaea}
.ws-solved{color:var(--green)}
#ws-pane-desc #problem{font-size:14.5px}
#ws-pane-desc .example{padding:12px 16px;font-size:12.5px;line-height:1.8}
.ws-guide{margin:26px 0 22px;padding:14px 16px;border-radius:8px;background:#f6f9fc;font-size:13px;color:var(--muted)}
.ws-guide b{color:var(--ink)}
.ws-guide ol{margin:6px 0 0;padding-left:20px}
.ws-pane .lesson-bottom{padding-top:16px}

/* 题解 */
#ws-pane-solution section{margin:0 0 30px}
#ws-pane-solution h2{margin:0 0 12px;font-size:17px}
#ws-pane-solution pre{max-height:none}
#ws-pane-solution .lab-views{max-width:100%}

/* AI 解答 */
.wsp-ai{display:flex;flex-direction:column;min-height:100%}
.wsp-modes{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:8px}
.wsp-modes button{display:flex;flex-direction:column;align-items:flex-start;gap:2px;padding:9px 11px;border:1px solid var(--line);border-radius:9px;background:#fff;color:var(--ink);text-align:left}
.wsp-modes button:hover:not(:disabled){border-color:#c7b8f0;background:#faf8ff}
.wsp-modes button b{font-size:13.5px}
.wsp-modes button span{font-size:11.5px;line-height:1.4;color:var(--muted)}
.wsp-modes button:disabled{opacity:.55;cursor:not-allowed}
.wsp-note{margin:8px 0 14px;font-size:11.5px;color:#94a3b8}
.wsp-thread{flex:1;display:flex;flex-direction:column;gap:14px;padding-bottom:12px}
.wsp-item{border:1px solid var(--line);border-radius:10px;padding:12px 14px;background:#fff}
.wsp-item.live{border-color:#d5cbf5;box-shadow:0 0 0 3px #f4f0ff}
.wsp-item header{display:flex;align-items:center;gap:8px;margin-bottom:6px;font-size:12px;color:#94a3b8}
.wsp-tag{padding:1px 8px;border-radius:999px;background:#f1edff;color:#5b3fb8;font-weight:600}
.wsp-acts{margin-left:auto;display:flex;gap:2px}
.wsp-acts button{padding:2px 7px;border:0;border-radius:6px;background:none;color:var(--muted);font-size:12px}
.wsp-acts button:hover{background:#f1f5f8;color:var(--ink)}
.wsp-acts [data-del]:hover{color:var(--red)}
.wsp-q{margin:0 0 8px;padding:7px 10px;border-radius:8px;background:#f5f7fa;font-size:13px;white-space:pre-wrap;overflow-wrap:anywhere}
.wsp-ask{position:sticky;bottom:-32px;margin:0 -24px -32px;padding:10px 24px 14px;background:linear-gradient(to bottom,rgba(255,255,255,.85),#fff 14px);border-top:1px solid #edf1f5}
.wsp-ask textarea{display:block;width:100%;min-height:58px;max-height:180px;padding:9px 11px;border:1px solid var(--line);border-radius:9px;font:inherit;font-size:13.5px;line-height:1.5;color:var(--ink);resize:vertical;field-sizing:content}
.wsp-ask textarea:focus{outline:0;border-color:#a593e3;box-shadow:0 0 0 3px #f1edff}
.wsp-ask-row{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-top:8px}
.wsp-check{display:inline-flex;align-items:center;gap:6px;font-size:12.5px;color:var(--muted)}
.wsp-ask-row button,.wsp-empty button,.wsp-note-ai button,.wsp-code-acts button,.wsp-notes button.primary{padding:5px 14px;border:1px solid var(--line);border-radius:7px;background:#fff;color:var(--ink);font-size:13px;font-weight:600}
.ws button.primary{background:var(--green);border-color:var(--green);color:#fff}
.ws button.primary:hover:not(:disabled){background:#077a55}
.ws button.primary:disabled{opacity:.55;cursor:not-allowed}
.wsp-flash{margin:0 0 10px;padding:7px 11px;border-radius:7px;background:#fdf6ea;color:#86500a;font-size:12.5px}
.wsp-err{padding:9px 12px;border-radius:8px;background:#fdf1f1;color:#9b2c2c;font-size:13px}
.wsp-err a{color:inherit;font-weight:600;text-decoration:underline}
.wsp-hint{margin:6px 0;color:var(--muted);font-size:13px}
.wsp-wait::before{content:"";display:inline-block;width:11px;height:11px;margin-right:7px;vertical-align:-1px;border:2px solid #ddd5f6;border-top-color:#7c5cd6;border-radius:50%;animation:sbxspin .8s linear infinite}
.wsp-empty{margin:18px 0;padding:22px 20px;border:1px dashed #cdd8e3;border-radius:10px;text-align:center;font-size:13.5px}
.wsp-empty b{display:block;margin-bottom:4px}
.wsp-empty p{margin:0 0 12px;color:var(--muted)}

/* Markdown 渲染 */
.md{font-size:14px;line-height:1.72;overflow-wrap:anywhere}
.md>:first-child{margin-top:0}
.md>:last-child{margin-bottom:0}
.md h1,.md h2,.md h3,.md h4{margin:16px 0 6px;line-height:1.4}
.md h1{font-size:18px}.md h2{font-size:16.5px}.md h3{font-size:15px}.md h4{font-size:14px}
.md p,.md ul,.md ol,.md blockquote,.md table{margin:0 0 10px}
.md ul,.md ol{padding-left:22px}
.md li+li{margin-top:3px}
.md blockquote{padding:4px 12px;border-left:3px solid #d5cbf5;color:var(--muted)}
.md code{padding:1px 5px;border-radius:4px;background:#f1f4f8;font:12.5px ui-monospace,SFMono-Regular,Menlo,Consolas,monospace}
.md pre{position:relative;margin:0 0 12px;padding:11px 13px;border-radius:8px;background:#f6f8fa;overflow:auto;border:1px solid #edf1f5}
.md pre code{padding:0;background:none;font-size:12.5px;line-height:1.6}
.md table{border-collapse:collapse;display:block;overflow-x:auto;font-size:13px}
.md th,.md td{border:1px solid var(--line);padding:5px 9px}
.md th{background:#f6f8fa}
.md hr{border:0;border-top:1px solid var(--line);margin:14px 0}
.md a{color:var(--blue)}
.wsp-copy{position:absolute;top:6px;right:6px;padding:2px 8px;border:1px solid var(--line);border-radius:6px;background:#fff;color:var(--muted);font-size:11.5px;opacity:0;transition:opacity .15s}
.md pre:hover .wsp-copy,.wsp-copy:focus-visible{opacity:1}
.hljs-keyword,.hljs-built_in,.hljs-selector-tag{color:#8a3fb8}
.hljs-string,.hljs-regexp,.hljs-attr{color:#0a7d4f}
.hljs-number,.hljs-literal{color:#b45309}
.hljs-comment,.hljs-quote{color:#94a3b8;font-style:italic}
.hljs-title,.hljs-function .hljs-title,.hljs-title.function_{color:#245b9e}
.hljs-type,.hljs-class .hljs-title,.hljs-title.class_{color:#a3460a}
.hljs-meta{color:#64748b}

/* 笔记 */
.wsp-notes{display:flex;flex-direction:column;min-height:100%}
.wsp-note-bar{display:flex;align-items:center;gap:10px;margin-bottom:10px}
.wsp-seg{display:inline-flex;padding:2px;border-radius:8px;background:#f1f5f8}
.wsp-seg button{padding:3px 12px;border:0;border-radius:6px;background:none;color:var(--muted);font-size:12.5px;font-weight:600}
.wsp-seg button[aria-selected=true]{background:#fff;color:var(--ink);box-shadow:0 1px 2px rgba(15,23,42,.08)}
.wsp-status{flex:1;font-size:12px;color:#94a3b8}
.wsp-status.ok{color:var(--green)}
.wsp-status.warn{color:var(--amber)}
#wsp-note-ai{padding:4px 11px;border:1px solid #ddd5f6;border-radius:7px;background:#faf8ff;color:#5b3fb8;font-size:12.5px;font-weight:600}
#wsp-note-ai:hover:not(:disabled){background:#f1edff}
#wsp-note-text{flex:1;display:block;width:100%;min-height:260px;padding:12px 14px;border:1px solid var(--line);border-radius:9px;font:13.5px/1.7 ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;color:var(--ink);resize:none}
#wsp-note-text:focus{outline:0;border-color:#9fb6cc}
#wsp-note-preview{flex:1;min-height:260px;padding:12px 14px;border:1px solid #edf1f5;border-radius:9px}
#wsp-note-text[hidden],#wsp-note-preview[hidden],.wsp-note-ai[hidden]{display:none}
.wsp-note-ai{margin-top:12px;padding:12px 14px;border:1px solid #ddd5f6;border-radius:10px;background:#fcfbff}
.wsp-note-ai .wsp-code-acts,.wsp-note-ai p:last-child{display:flex;gap:8px;flex-wrap:wrap;margin:10px 0 0}

/* 提交记录 */
.wsp-subs{width:100%;border-collapse:collapse;font-size:13px}
.wsp-subs th{padding:8px 10px;text-align:left;font-size:12px;font-weight:600;color:var(--muted);border-bottom:1px solid var(--line)}
.wsp-subs td{padding:10px;border-bottom:1px solid #edf1f5;white-space:nowrap}
.wsp-subs tbody tr[data-i]{cursor:pointer}
.wsp-subs tbody tr[data-i]:hover{background:#f8fafc}
.wsp-subs tbody tr[aria-expanded=true]{background:#f5f8fb}
.wsp-subs small{margin-left:6px;color:#94a3b8}
.wsp-v{font-weight:700}
.wsp-v.ok{color:var(--green)}.wsp-v.bad{color:var(--red)}.wsp-v.warn{color:var(--amber)}
.wsp-code-row td{padding:0 10px 12px;white-space:normal;background:#f5f8fb}
.wsp-code-row pre{margin:0;padding:11px 13px;max-height:360px;overflow:auto;border-radius:8px;background:#fff;border:1px solid var(--line);font:12.5px/1.6 ui-monospace,SFMono-Regular,Menlo,Consolas,monospace}
.wsp-code-acts{display:flex;gap:8px;margin:8px 0 0}

/* 中等宽度：顶栏收紧 */
@media(max-width:1150px){.ws-crumb{display:none}.wsp-modes{grid-template-columns:repeat(2,minmax(0,1fr))}.ws-pane{padding:18px 18px 28px}.wsp-ask{margin:0 -18px -28px;padding:10px 18px 12px;bottom:-28px}}

/* 手机与窄屏：一次显示一侧，用顶栏切换 */
@media(max-width:850px){
  .ws-top{gap:8px;padding:0 10px}
  .ws-home span:last-child{display:none}
  .ws-switch{display:inline-flex;padding:2px;border-radius:8px;background:#f1f5f8}
  .ws-switch button{padding:3px 12px;border:0;border-radius:6px;background:none;color:var(--muted);font-size:13px;font-weight:600}
  .ws-switch button[aria-pressed=true]{background:#fff;color:var(--ink);box-shadow:0 1px 2px rgba(15,23,42,.08)}
  .ws-body{grid-template-columns:minmax(0,1fr);padding:0}
  .ws-split{display:none}
  .ws-wide{display:none}
  .ws-left,.ws-right{border:0;border-radius:0}
  .ws[data-view=left] .ws-right,.ws[data-view=right] .ws-left{display:none}
}
@media(max-width:560px){
  .ws-lc{display:none}
  .ws-done{padding:0 8px!important}
  .ws-pane{padding:16px 14px 24px}
  .wsp-ask{margin:0 -14px -24px;padding:10px 14px 12px;bottom:-24px}
  .ws-head h1{font-size:19px}
  .wsp-modes button span{display:none}
  .wsp-subs th:nth-child(4),.wsp-subs td:nth-child(4){display:none}
}
@media(max-width:400px){.ws-step{display:none}}
@media(prefers-reduced-motion:reduce){.ws-split::after{transition:none}}

/* 抵消 styles.css 的全局按钮/下拉/代码块样式（只作用于工作台自有控件，不影响题解里的演示控件） */
.ws-top button,.ws-tabs button,.ws-switch button,.sbx button,.sbx select,.wsp-ai button,.wsp-notes button,.wsp-subs button,.wsp-empty button,.wsp-code-acts button,.ws-tabbar .ws-wide,body.ws-on .lab-langs button{min-height:0}
.sbx select{padding-top:0;padding-bottom:0}
.sbx pre,.md pre,.wsp-code-row pre{color:var(--ink)}
.sbx-offline pre{border:1px solid #f0dfbf;font:12.5px/1.6 ui-monospace,SFMono-Regular,Menlo,Consolas,monospace}
.ws-head .tags span{font-size:12px;line-height:20px}
.wsp-note-ai>header{display:flex;align-items:center;justify-content:space-between;gap:8px;flex-wrap:wrap;margin-bottom:6px}
.wsp-note-ai>header .wsp-acts{display:flex;gap:6px}
.wsp-note-ai>header button{padding:3px 11px;font-size:12.5px}
.wsp-subs{table-layout:fixed}
.wsp-subs td{overflow:hidden;text-overflow:ellipsis}
.wsp-subs th:nth-child(1),.wsp-subs td:nth-child(1){width:34%}
.wsp-code-row td{max-width:0;overflow:visible}
@media (max-width:600px){.wsp-subs small{display:none}.wsp-subs th,.wsp-subs td{padding-left:6px;padding-right:6px}.wsp-subs th:nth-child(1),.wsp-subs td:nth-child(1){width:28%}}
/* 题解区实验控件：在工作台内收紧尺寸，与右侧编辑器控件一致 */
body.ws-on .lab-presets button,body.ws-on .lab-controls button,body.ws-on .lab-apply{min-height:0;padding:6px 12px;font-size:13px;border-radius:8px}
body.ws-on .lab-presets{gap:6px}
body.ws-on .lab-field input{min-height:0}
@media (pointer:coarse){body.ws-on .lab-presets button,body.ws-on .lab-controls button,body.ws-on .lab-apply{min-height:36px}}

/* 题解宽屏演示：按钮与语言切换保持紧凑 */
.ws-tabbar .ws-wide{height:28px;padding:0 10px;font-size:12.5px;line-height:26px}
body.ws-on .lab-langs button{font-size:12px;padding:4px 9px}