diff --git a/SHA256SUMS b/SHA256SUMS
index 6ff5435..0330c5c 100644
--- a/SHA256SUMS
+++ b/SHA256SUMS
@@ -7,4 +7,4 @@ f9fbb4defa45b43abe0ce66973b1f4d553369b3a43c01d04f206c573f7dc96ca  install.sh
 4f6e8db3698a62f57823d3298a0e6814593de6fa3d31e4751b7ea4a76e553e35  systemd/pigway-pi-control.service
 aa21cef9a06593371ccff005335b6c0c826fbf4b5c48e4255b5f4b75ce6e9217  systemd/pigway-pi-control-api.service
 9f59e7313ee58e687ae6dd29d175c67082674254ac5c5f54168b2735b64c20a4  uninstall.sh
-16eacf89c50ae58bc4975c15fe6196cb7156cf367f987575dc18bff36e9ee413  web/index.html
+215395cfc3ed8e5556d146e25cb828ffb72364fc3eb6ad2ddd9931cd8a5c8e0c  web/index.html
diff --git a/web/index.html b/web/index.html
index 585d473..ea09fc8 100644
--- a/web/index.html
+++ b/web/index.html
@@ -8,11 +8,11 @@
 </style>
 <style>
 .log-filter{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:10px;align-items:end}.log-filter label{color:var(--muted);font-size:12px}.log-filter input,.log-filter select{width:100%;margin-top:5px;border:1px solid var(--line);border-radius:7px;background:#0d151e;color:var(--text);padding:9px}.quick-range{display:flex;gap:7px;flex-wrap:wrap;margin:12px 0}.log-table-wrap{overflow:auto;border:1px solid var(--line);border-radius:9px}.log-table{width:100%;border-collapse:collapse;min-width:760px}.log-table th,.log-table td{text-align:left;padding:10px;border-bottom:1px solid #203040;vertical-align:top}.log-table th{position:sticky;top:0;background:#152130;z-index:1}.sort-button{border:0;background:transparent;padding:0;font-weight:700}.sort-button:hover{background:transparent}.log-message{font:12px/1.5 ui-monospace,SFMono-Regular,monospace;white-space:pre-wrap;word-break:break-word}.log-pager{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-top:12px}@media(max-width:800px){.log-filter{grid-template-columns:1fr 1fr}}@media(max-width:470px){.log-filter{grid-template-columns:1fr}}
-.header-actions{display:flex;align-items:center;gap:12px;flex-wrap:wrap;justify-content:flex-end}.preference{display:grid;gap:4px;color:var(--muted);font-size:12px}.preference select{height:35px;border:1px solid var(--line);border-radius:7px;background:#0d151e;color:var(--text);padding:7px 28px 7px 9px}.header-actions .live{align-self:flex-end;height:35px}.service-list{scrollbar-width:none}.service-list:hover{scrollbar-width:thin;scrollbar-color:var(--line) transparent}.service-list::-webkit-scrollbar{width:0}.service-list:hover::-webkit-scrollbar{width:7px}.service-list::-webkit-scrollbar-track{background:transparent}.service-list::-webkit-scrollbar-thumb{background:var(--line);border-radius:999px}[data-theme="light"]{color-scheme:light;--bg:#eef3f8;--panel:#fff;--panel2:#f6f9fc;--line:#c8d4e0;--text:#172333;--muted:#5d7085;--good:#168653;--bad:#c93d3d;--blue:#176fc1}[data-theme="light"] body{background:radial-gradient(circle at top right,#d9e9f8 0,#eef3f8 45%)}[data-theme="light"] nav{background:#eef3f8e8}[data-theme="light"] button{background:#e7eef6}[data-theme="light"] button:hover,[data-theme="light"] button.active{background:#d9e9f8}[data-theme="light"] .field input,[data-theme="light"] .field select,[data-theme="light"] .service-form input,[data-theme="light"] .service-search,[data-theme="light"] .toolbar input,[data-theme="light"] .log-filter input,[data-theme="light"] .log-filter select,[data-theme="light"] .preference select{background:#fff}[data-theme="light"] .badge{background:#e5edf5;color:#31465c}[data-theme="light"] .badge.good{background:#d9f3e5;color:#087444}[data-theme="light"] .badge.bad{background:#fde5e5;color:#b72f2f}[data-theme="light"] .savebar{background:#f7fafcef;box-shadow:0 8px 25px #3453}[data-theme="light"] .log-table th{background:#e7eef6}[data-theme="light"] .row,[data-theme="light"] .log-table th,[data-theme="light"] .log-table td,[data-theme="light"] .log,[data-theme="light"] .service-list{border-color:#d6e0ea}@media(max-width:470px){.header-actions{justify-content:flex-start}}.host-panel{margin-top:14px;transition:transform .18s ease,box-shadow .18s ease,border-color .18s ease}.host-head{display:flex;justify-content:space-between;gap:16px;align-items:start;margin-bottom:12px}.device-details{display:flex;gap:8px 16px;flex-wrap:wrap;font-size:12px;color:var(--muted);margin-top:5px}.host-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}.metric{background:var(--panel2);border:1px solid var(--line);border-radius:9px;padding:12px}.metric .value{font-size:20px}.progress{height:7px;background:color-mix(in srgb,var(--line) 70%,transparent);border-radius:999px;overflow:hidden;margin:8px 0}.progress span{display:block;height:100%;background:var(--blue);border-radius:inherit}.host-select{display:grid;gap:4px;color:var(--muted);font-size:12px}.host-select select{min-width:210px;border:1px solid var(--line);border-radius:7px;background:var(--panel2);color:var(--text);padding:9px}.config-target-toolbar{display:grid;grid-template-columns:minmax(220px,.65fr) minmax(0,1.35fr);align-items:end}.token-control{display:flex;gap:8px;align-items:center}.token-control input{min-width:0;margin:0}.token-control button{white-space:nowrap}.bulk-tools{display:flex;gap:8px;flex-wrap:wrap;margin:12px 0}.bulk-section{padding:12px}.bulk-section-title{display:flex;align-items:center;gap:8px;font-weight:700}.bulk-items{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:6px 18px;margin:10px 0 0 24px}.bulk-item{display:flex;align-items:flex-start;gap:7px}.bulk-item span{min-width:0}.bulk-value{display:block;color:var(--muted);font-size:12px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.bulk-target{display:grid;grid-template-columns:auto minmax(120px,.5fr) minmax(220px,1fr);gap:10px;align-items:center}.bulk-target input[type="password"],.bulk-target input[type="text"]{width:100%;border:1px solid var(--line);border-radius:7px;background:#0d151e;color:var(--text);padding:8px}.host-checks{display:flex;gap:12px;flex-wrap:wrap}.host-checks label{display:flex;gap:6px;align-items:center}.offline-card{border-color:var(--bad)}@media(hover:hover) and (pointer:fine){.host-panel:hover{transform:translateY(-3px);border-color:color-mix(in srgb,var(--blue) 45%,var(--line));box-shadow:0 16px 34px #0006}[data-theme="light"] .host-panel:hover{box-shadow:0 14px 30px #3454}}@media(max-width:900px){.host-grid{grid-template-columns:repeat(2,1fr)}}@media(max-width:650px){.config-target-toolbar{grid-template-columns:1fr}.bulk-items{grid-template-columns:1fr}.bulk-target{grid-template-columns:auto 1fr}.bulk-target input{grid-column:1/span 2}}@media(max-width:550px){.host-grid{grid-template-columns:1fr}.host-head{flex-direction:column}}
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 </style>
 </head>
 <body><main>
-<header><div><h1>PIGWay Pi Control</h1><div class="sub" id="identity">正在连接树莓派…</div></div><div class="header-actions"><label class="preference"><span>语言</span><select id="language"><option value="zh">中文</option><option value="en">English</option></select></label><label class="preference"><span>颜色模式</span><select id="theme"><option value="auto">自动</option><option value="dark">深色</option><option value="light">浅色</option></select></label><div class="live"><span class="dot" id="dot"></span><span id="liveText">离线</span></div></div></header>
+<header><div><h1>PIGWay Pi Control</h1><div class="sub" id="identity">正在连接树莓派…</div></div><div class="header-actions"><label class="preference"><span>语言</span><select id="language"><option value="zh">中文</option><option value="en">English</option></select></label><label class="preference theme-preference"><span class="sr-only">颜色模式</span><select id="theme" aria-label="颜色模式"><option value="auto">◐ 跟随系统</option><option value="light">☀ 浅色模式</option><option value="dark">☾ 深色模式</option></select></label><div class="live"><span class="dot" id="dot"></span><span id="liveText">离线</span></div></div></header>
 <nav><button class="active" data-tab="overview">运行状态</button><button data-tab="logs">事件日志</button><button data-tab="config">系统配置</button></nav>
 <section id="overview"><div id="hostCards"><div class="panel muted">正在读取主机状态…</div></div></section>
 <section id="logs" class="hidden"><div class="panel"><h2>事件日志</h2><p class="muted">查询 systemd journal 中仍在保留的全部硬件 Agent 事件。</p><div class="quick-range"><button data-log-range="today">今天</button><button data-log-range="yesterday">昨天</button><button data-log-range="week">本周</button><button data-log-range="month">本月</button><button data-log-range="all">全部</button></div><div class="log-filter"><label>开始日期<input id="logStart" type="date"></label><label>结束日期<input id="logEnd" type="date"></label><label>严重程度<select id="logSeverity"><option value="">全部程度</option><option value="DEBUG">调试</option><option value="INFO">信息</option><option value="NOTICE">注意</option><option value="WARN">警告</option><option value="ERROR">错误</option><option value="CRITICAL">严重</option><option value="ALERT,EMERGENCY">紧急</option></select></label><label>机器标识<select id="logMachine"><option value="">全部机器</option></select></label><label>事件类型<select id="logEvent"><option value="">全部事件</option></select></label><label>关键词<input id="logSearch" placeholder="搜索日志内容"></label></div><div class="toolbar"><button id="refreshLogs">查询</button><button id="resetLogs">重置</button><span class="muted" id="logSummary"></span></div><div class="log-table-wrap"><table class="log-table"><thead><tr><th><button class="sort-button" data-log-sort="timestamp">时间</button></th><th><button class="sort-button" data-log-sort="machine">机器</button></th><th><button class="sort-button" data-log-sort="severity">程度</button></th><th><button class="sort-button" data-log-sort="event">事件类型</button></th><th><button class="sort-button" data-log-sort="message">内容</button></th></tr></thead><tbody id="logRows"></tbody></table></div><div class="log-pager"><button id="logPrev">上一页</button><span class="muted" id="logPage"></span><button id="logNext">下一页</button></div></div></section>
@@ -20,7 +20,7 @@
 </main><script>
 let LANG=localStorage.getItem('pigwayLanguage')||'zh';
 const EN={
-'语言':'Language','颜色模式':'Appearance','中文':'中文','自动':'Auto','深色':'Dark','浅色':'Light','正在连接树莓派…':'Connecting to Raspberry Pi…','在线':'Online','离线':'Offline',
+'语言':'Language','颜色模式':'Appearance','中文':'中文','自动':'Auto','深色':'Dark','浅色':'Light','◐ 跟随系统':'◐ Follow system','☀ 浅色模式':'☀ Light mode','☾ 深色模式':'☾ Dark mode','正在连接树莓派…':'Connecting to Raspberry Pi…','在线':'Online','离线':'Offline',
 '运行状态':'Status','事件日志':'Event log','系统配置':'Settings','处理器负载':'CPU load','处理器温度':'CPU temperature','内存占用':'Memory usage','磁盘占用':'Disk usage','主网络':'Primary network','显示状态':'Display status','当前告警':'Active alerts','无告警':'No alerts','服务与进程监控':'Service and process monitors',
 '查询 systemd journal 中仍在保留的全部硬件 Agent 事件。':'Query all retained hardware Agent events in the systemd journal.','今天':'Today','昨天':'Yesterday','本周':'This week','本月':'This month','全部':'All','开始日期':'Start date','结束日期':'End date','严重程度':'Severity','全部程度':'All severities','调试':'Debug','信息':'Info','注意':'Notice','警告':'Warning','错误':'Error','严重':'Critical','紧急':'Emergency','事件类型':'Event type','全部事件':'All events','关键词':'Keyword','搜索日志内容':'Search log messages','查询':'Search','重置':'Reset','时间':'Time','程度':'Severity','内容':'Message','上一页':'Previous','下一页':'Next',
 '配置按用途分组，只显示当前模式需要的选项。保存时会备份配置并重启硬件 Agent。':'Settings are grouped by purpose and only relevant options are shown. Saving creates a backup and restarts the hardware Agent.','配置写入令牌（Bearer Token）':'Configuration Bearer Token','显示令牌':'Show token','隐藏令牌':'Hide token','保存并应用':'Save and apply','尚未修改':'No changes',
@@ -40,7 +40,7 @@ Object.assign(EN,{'机器标识':'Host ID','机器':'Host','全部机器':'All h
 Object.assign(EN,{'端口':'port','0.0.0.0 允许局域网访问；127.0.0.1 仅本机。':'0.0.0.0 allows LAN access; 127.0.0.1 is local only.','范围 1–65535；保存后 API 自动重启。':'Range: 1–65535. The API restarts after saving.','API 服务不能停止自身':'The API service cannot stop itself','已自动填写，可继续修改。':'Filled automatically; you can continue editing.','请先选择同步目标机器':'Select target hosts first'});
 Object.assign(EN,{'批量同步':'Batch sync','从当前配置机器复制所选配置项到目标机器':'Copy selected settings from the current configuration host to target hosts','来源机器':'Source host','目标机器':'Target hosts','配置项':'Settings','全部选择':'Select all','全部取消':'Clear all','反选':'Invert selection','开始批量同步':'Start batch sync','机器标识和机器列表不会参与同步。':'Host identity and host registry are never synchronized.','请选择至少一个配置项':'Select at least one setting','请选择至少一台目标机器':'Select at least one target host','不能选择来源机器作为目标':'The source host cannot also be a target','目标机器令牌':'Target host token','项已选择':'settings selected'});
 const ZH=Object.fromEntries(Object.entries(EN).map(([zh,en])=>[en,zh])),tr=s=>LANG==='en'?(EN[s]||s):(ZH[s]||s);
-function translateNode(root=document){const map=LANG==='en'?EN:ZH,translate=value=>{const trim=value.trim();return trim&&map[trim]?value.replace(trim,map[trim]):value};const walker=document.createTreeWalker(root,NodeFilter.SHOW_TEXT);let n;while(n=walker.nextNode())n.nodeValue=translate(n.nodeValue);root.querySelectorAll?.('[placeholder],[title]').forEach(e=>['placeholder','title'].forEach(a=>{const v=e.getAttribute(a);if(v)e.setAttribute(a,translate(v))}))}
+function translateNode(root=document){const map=LANG==='en'?EN:ZH,translate=value=>{const trim=value.trim();return trim&&map[trim]?value.replace(trim,map[trim]):value};const walker=document.createTreeWalker(root,NodeFilter.SHOW_TEXT);let n;while(n=walker.nextNode())n.nodeValue=translate(n.nodeValue);root.querySelectorAll?.('[placeholder],[title],[aria-label]').forEach(e=>['placeholder','title','aria-label'].forEach(a=>{const v=e.getAttribute(a);if(v)e.setAttribute(a,translate(v))}))}
 function applyTheme(value){const resolved=value==='auto'?(matchMedia('(prefers-color-scheme: dark)').matches?'dark':'light'):value;document.documentElement.dataset.theme=resolved}
 const $=id=>document.getElementById(id),tabs=[...document.querySelectorAll('nav button')];let original={},fleetHosts=[],currentConfigHost='';const esc=s=>String(s??'').replace(/[&<>"']/g,c=>({'&':'&amp;','<':'&lt;','>':'&gt;','"':'&quot;',"'":'&#39;'}[c]));
 const sectionMeta={device:['设备标识','自定义本机显示名称和稳定标识'],hosts:['机器列表','登记需要聚合监控的其他节点'],led:['灯光设置','正常灯效与告警颜色'],alerts:['告警阈值','处理器、内存、温度、磁盘和 Wi-Fi'],fan:['风扇温控','温度档位与降档回差'],timing:['刷新周期','传感器、屏幕、网络和健康检查'],display:['屏幕布局','OLED 四行文字位置'],dark_mode:['板载指示灯','树莓派电源灯与活动灯'],services:['服务监控','监控 systemd 服务'],processes:['进程监控','监控普通进程关键字'],api:['Web 与 API','监听地址、端口和日志数量'],bulk_sync:['批量同步','从当前配置机器复制所选配置项到目标机器']};