:root{color-scheme:light;--accent:#167a67;--nav:#102a33;--bg:#f3f6f5;--panel:#fff;--text:#162529;--muted:#6d7b7d;--line:#dfe8e5;--soft:#e8f4f0;--danger:#a9322c}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font:14px/1.65 Inter,"PingFang SC","Microsoft YaHei",system-ui,sans-serif}button,input,textarea,select{font:inherit}button,.button{border:1px solid var(--line);background:var(--panel);color:var(--text);padding:9px 14px;border-radius:9px;text-decoration:none;cursor:pointer}.primary{background:var(--accent)!important;border-color:var(--accent)!important;color:#fff!important}.shell{display:grid;grid-template-columns:220px 1fr;min-height:100vh}aside{background:var(--nav);color:#eaf5f2;padding:22px 15px;display:flex;flex-direction:column}.brand{display:flex;gap:10px;align-items:center;margin-bottom:24px}.brand b{display:grid;place-items:center;width:36px;height:36px;background:#31b895;border-radius:10px}.brand span{font-size:16px}.brand small{display:block;color:#9fc0b8;font-size:12px}.nav{display:block;color:#b9d0ca;padding:11px 13px;border-radius:9px;text-decoration:none;margin:4px 0}.nav.active,.nav:hover{background:#1e493f;color:white}.logout{margin-top:auto;border-top:1px solid #28444a;padding-top:14px;display:flex;justify-content:space-between;align-items:center}.logout button{background:transparent;color:#b9d0ca;border-color:#35545b;padding:6px 10px}main{padding:26px;min-width:0}header{display:flex;justify-content:space-between;align-items:center;gap:15px;margin-bottom:20px}h1{font-size:23px;margin:0;font-weight:600}h2{font-size:16px;margin:0 0 8px}header p,.muted{color:var(--muted);margin:4px 0}.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-bottom:16px}.stat,.panel,.form-panel,.review,.conversation{background:var(--panel);border:1px solid var(--line);border-radius:13px}.stat{padding:16px}.stat span{color:var(--muted)}.stat b{display:block;font-size:25px;margin-top:6px}.filters{display:grid;grid-template-columns:1fr 180px auto;gap:9px;padding:14px;border-bottom:1px solid var(--line)}input,select,textarea{width:100%;border:1px solid var(--line);border-radius:9px;padding:10px 11px;background:#fff;color:var(--text)}textarea{min-height:130px;resize:vertical}.table-wrap{overflow-x:auto}table{border-collapse:collapse;width:100%}th,td{text-align:left;padding:13px 15px;border-top:1px solid var(--line);vertical-align:middle}th{color:var(--muted);font-weight:500;background:#f8faf9}td a{color:var(--accent);font-weight:600;text-decoration:none}td small{display:block;color:var(--muted)}.badge{display:inline-block;background:var(--soft);color:var(--accent);padding:3px 8px;border-radius:99px;font-size:12px}.empty{text-align:center;padding:50px;color:var(--muted)}.conversation{padding:20px;display:grid;gap:15px}.message{max-width:78%;padding:11px 13px;border-radius:12px;background:#edf1f1}.message p{white-space:pre-wrap;margin:0}.message small{display:block;color:var(--muted);margin-top:7px}.message.customer{justify-self:end;background:#dff3ec}.answer{max-width:88%}.answer .message{max-width:100%}.message-actions{display:flex;gap:12px;justify-content:space-between;color:var(--muted);font-size:12px;margin-top:6px}.message-actions a{color:var(--accent);text-decoration:none}.form-panel{padding:20px;max-width:900px}.form-panel label{display:grid;gap:7px;margin-bottom:16px;color:var(--muted)}.quoted{background:#f3f6f5;color:var(--text);padding:12px;border-radius:9px;white-space:pre-wrap}.actions{display:flex;justify-content:flex-end;gap:9px}.error{background:#fff0ef;color:var(--danger);padding:10px;border-radius:9px;margin-bottom:12px}.review{padding:18px;margin-bottom:12px}.review>div:first-child,.review-foot{display:flex;justify-content:space-between;gap:12px}.review small,.review-foot{color:var(--muted)}.review-foot{border-top:1px solid var(--line);padding-top:11px}.coming{padding:24px;max-width:800px}.coming button{margin-top:12px}.login-bg{min-height:100vh;display:grid;place-items:center;padding:20px;background:#eaf2ef}.login-card{width:min(430px,100%);background:#fff;border:1px solid var(--line);border-radius:16px;padding:30px;box-shadow:0 18px 60px #17362c1c}.login-logo{width:48px;height:48px;border-radius:14px;background:var(--accent);color:#fff;display:grid;place-items:center;font-size:20px}.login-card h1{margin-top:15px}.login-card p{color:var(--muted)}.login-card label{display:grid;gap:6px;margin:14px 0}.login-card button{width:100%;margin-top:8px}@media(max-width:760px){.shell{grid-template-columns:1fr}aside{padding:10px;display:grid;grid-template-columns:auto 1fr auto;align-items:center}.brand{margin:0}.brand span,.logout span{display:none}aside nav{display:flex;justify-content:center}.nav{margin:0;padding:8px}.logout{margin:0;padding:0;border:0}main{padding:14px}.stats{grid-template-columns:1fr 1fr}.filters{grid-template-columns:1fr}.message{max-width:92%}}
:root{scroll-behavior:smooth}
.filters{grid-template-columns:minmax(180px,1fr) 135px 160px auto}
.conversation-layout{display:grid;grid-template-columns:minmax(0,1fr);gap:14px;align-items:start}
.conversation-layout.editing{grid-template-columns:minmax(0,1.5fr) minmax(300px,.85fr)}
.conversation-layout .conversation{min-width:0}
.message-actions{align-items:center;flex-wrap:wrap}
.answer-tools{display:flex;align-items:center;gap:14px;white-space:nowrap}
.answer-tools a,.text-action{font-size:13px;color:var(--accent);font-weight:600;text-decoration:none}
.text-action{border:0;background:transparent;padding:5px 0}
.edit-pane{background:var(--panel);border:1px solid var(--line);border-radius:13px;padding:20px;min-width:0}
.edit-pane{position:sticky;top:16px;max-height:calc(100vh - 32px);overflow:auto}
.page-back{margin-bottom:10px}
.page-back a{display:inline-flex;align-items:center;min-height:34px;color:var(--accent);font-weight:600;text-decoration:none}
.page-back a:hover{text-decoration:underline}
.edit-head{display:flex;justify-content:space-between;align-items:start;gap:12px;margin-bottom:18px}
.edit-head h2{margin:0}.edit-head p{color:var(--muted);margin:3px 0 0}
.edit-head a{font-size:25px;line-height:1;color:var(--muted);text-decoration:none}
.edit-pane label{display:grid;gap:7px;margin-bottom:15px;color:var(--muted)}
.edit-pane textarea{min-height:170px}
.edit-pane .quoted{max-height:190px;overflow:auto}
.draft-note{padding:11px 12px;border-radius:9px;background:#fff3df;color:#69440a;font-size:12px}
.saved-notice{padding:11px 13px;margin-bottom:15px;border-radius:9px;background:var(--soft);color:var(--accent)}
.pagination{display:flex;justify-content:space-between;align-items:center;gap:14px;padding:12px 15px;color:var(--muted)}
.pagination>div{display:flex;gap:12px}.pagination a{color:var(--accent)}
.course-record{border-left:3px solid var(--accent);padding-left:9px}
.feature-status{background:#fff8ea;border:1px solid #eed9a6;color:#765524;border-radius:10px;padding:10px 13px;margin-bottom:16px}
.stat{text-decoration:none;color:var(--text);transition:border-color .15s,transform .15s}
.stat:hover,.stat:focus-visible{border-color:var(--accent);transform:translateY(-2px);outline:none}
.stat small{display:block;color:var(--accent);font-size:12px;margin-top:2px}
.customer-row{cursor:pointer}
.customer-row:hover td,.customer-row:focus-visible td{background:#edf7f3}
.customer-row:focus-visible{outline:2px solid var(--accent);outline-offset:-2px}
.activity-list{display:grid;gap:12px}
.activity-card{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:16px 18px;display:grid;gap:12px}
.activity-card:hover,.activity-card:focus-visible{border-color:var(--accent);background:#fbfefd}
.activity-top{display:flex;justify-content:space-between;gap:12px;align-items:center}
.activity-top a,.activity-open{color:var(--accent);font-weight:600;text-decoration:none}
.activity-top span,.activity-card small{color:var(--muted);font-size:12px}
.activity-question p{margin:2px 0 0;font-weight:600}
.activity-answer{white-space:pre-wrap;line-height:1.7;background:#f4f8f7;border-radius:9px;padding:10px 12px;margin-top:4px}
.activity-open{justify-self:end;font-size:12px}
@media(max-width:1050px){.conversation-layout.editing{grid-template-columns:1fr}.edit-pane{position:fixed;right:12px;top:12px;width:min(460px,calc(100vw - 24px));height:calc(100vh - 24px);max-height:calc(100vh - 24px);overflow:auto;z-index:10;box-shadow:0 18px 55px #102a3340}}
@media(max-width:760px){.filters{grid-template-columns:1fr 1fr}.filters input{grid-column:1/-1}.filters button{grid-column:1/-1}}

/* Mobile-only presentation. Keep desktop layout and all routes, forms and actions unchanged. */
@media(max-width:760px){
  body{font-size:14px;line-height:1.55}
  .shell{display:block;min-width:0}
  .shell > aside{position:relative;display:grid;grid-template-columns:minmax(0,1fr) auto;grid-template-areas:"brand logout" "nav nav";gap:9px 8px;padding:10px 14px 8px;align-items:center}
  .shell > aside .brand{grid-area:brand;min-width:0;margin:0}
  .shell > aside .brand b{width:32px;height:32px;flex:none}
  .shell > aside .brand span{display:block;font-size:14px;white-space:nowrap}
  .shell > aside .brand small{display:none}
  .shell > aside nav{grid-area:nav;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:5px;width:100%}
  .shell > aside .nav{display:block;text-align:center;min-width:0;margin:0;padding:8px 4px;white-space:nowrap;font-size:13px}
  .shell > aside .logout{grid-area:logout;display:block;margin:0;padding:0;border:0}
  .shell > aside .logout button{min-height:36px;padding:6px 11px}
  main{padding:15px 12px 28px}
  header{display:flex;flex-direction:column;align-items:stretch;gap:12px;margin-bottom:14px}
  header h1{font-size:21px;line-height:1.3}
  header p{font-size:12px;line-height:1.5;margin-top:5px}
  header > .button{display:block;text-align:center;min-height:44px;padding:10px 12px}
  .page-back{margin-bottom:12px}
  .page-back a{min-height:40px}
  .feature-status{font-size:12px;line-height:1.55;padding:10px 11px;margin-bottom:12px}
  .stats{grid-template-columns:repeat(2,minmax(0,1fr));gap:9px;margin-bottom:12px}
  .stat{min-width:0;padding:12px 11px;min-height:104px}
  .stat span{font-size:12px}
  .stat b{font-size:23px;line-height:1.2;margin-top:5px}
  .stat small{font-size:11px;line-height:1.3;margin-top:7px}
  .filters{grid-template-columns:repeat(2,minmax(0,1fr));gap:9px;padding:12px}
  .filters input{grid-column:1/-1}
  .filters button{grid-column:1/-1;min-height:44px}
  .filters select{min-width:0;height:43px}
  .table-wrap{overflow:visible}
  .overview-table,.today-customers-table,.overview-table tbody,.today-customers-table tbody{display:block;width:100%}
  .overview-table thead,.today-customers-table thead{display:none}
  .overview-table tbody,.today-customers-table tbody{padding:11px;display:grid;gap:10px}
  .overview-table tr.customer-row,.today-customers-table tr.customer-row{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:8px 10px;border:1px solid var(--line);border-radius:12px;padding:12px;background:#fff;min-width:0}
  .overview-table tr.customer-row td,.today-customers-table tr.customer-row td{display:block;border:0;padding:0;min-width:0;overflow-wrap:anywhere}
  .overview-table tr.customer-row td:first-child,.today-customers-table tr.customer-row td:first-child{grid-column:1/-1;font-size:15px}
  .overview-table tr.customer-row td:first-child a,.today-customers-table tr.customer-row td:first-child a{display:inline-block;min-height:28px}
  .overview-table tr.customer-row td:nth-child(2),.today-customers-table tr.customer-row td:nth-child(3){grid-column:1/-1;line-height:1.5}
  .overview-table tr.customer-row td:nth-child(2)::before,.today-customers-table tr.customer-row td:nth-child(3)::before{content:"最近问题";display:block;font-size:11px;color:var(--muted);margin-bottom:2px}
  .overview-table tr.customer-row td:nth-child(3){grid-column:1;align-self:end}
  .overview-table tr.customer-row td:nth-child(4){grid-column:1;grid-row:4;font-size:12px;color:var(--muted)}
  .overview-table tr.customer-row td:nth-child(5){grid-column:2;grid-row:4;align-self:end;font-size:12px;color:var(--muted);white-space:nowrap;text-align:right}
  .today-customers-table tr.customer-row td:nth-child(2){grid-column:1;font-size:12px;color:var(--muted)}
  .today-customers-table tr.customer-row td:nth-child(2)::before{content:"今日消息 ";}
  .today-customers-table tr.customer-row td:nth-child(3){grid-row:3}
  .today-customers-table tr.customer-row td:nth-child(4){grid-column:2;grid-row:2;text-align:right;font-size:12px;color:var(--muted);white-space:nowrap}
  .today-customers-table tr.customer-row td:nth-child(5){grid-column:1/-1;border-top:1px solid var(--line);padding-top:8px;text-align:right}
  .today-customers-table tr.customer-row td:nth-child(5) a{display:inline-flex;align-items:center;min-height:36px}
  .overview-table tr:not(.customer-row),.today-customers-table tr:not(.customer-row){display:block}
  .overview-table tr:not(.customer-row) td,.today-customers-table tr:not(.customer-row) td{display:block;padding:28px 8px;border:0}
  .pagination{flex-wrap:wrap;justify-content:center;text-align:center;padding:12px;line-height:1.5}
  .pagination > div{width:100%;justify-content:center;gap:25px}
  .pagination a{display:inline-flex;min-height:38px;align-items:center}
  .conversation{padding:12px;gap:12px}
  .message{max-width:88%;padding:10px 11px;overflow-wrap:anywhere}
  .answer{max-width:100%;min-width:0}
  .answer .message{max-width:90%}
  .message-actions{display:flex;flex-direction:column;align-items:stretch;gap:2px;margin-top:4px;overflow-wrap:anywhere}
  .answer-tools{justify-content:flex-end;gap:4px}
  .answer-tools a,.text-action{display:inline-flex;align-items:center;justify-content:center;min-height:40px;min-width:52px;padding:8px;font-size:13px}
  .activity-card{padding:13px;gap:10px;min-width:0;overflow-wrap:anywhere}
  .activity-top{align-items:flex-start;flex-direction:column;gap:2px}
  .activity-answer{overflow-wrap:anywhere}
  .activity-open{display:inline-flex;align-items:center;min-height:40px}
  .review{padding:14px;overflow-wrap:anywhere}
  .review-foot{flex-wrap:wrap;font-size:12px}
  .coming{padding:16px}
  .form-panel{padding:14px}
  .actions button,.actions .button{min-height:44px}
  .edit-pane{position:fixed;inset:0;top:0;right:0;display:block;width:100vw;height:100vh;height:100dvh;max-height:100vh;max-height:100dvh;min-width:0;margin:0;padding:calc(12px + env(safe-area-inset-top)) 16px calc(16px + env(safe-area-inset-bottom));border:0;border-radius:0;z-index:30;overflow-y:auto;overscroll-behavior:contain;background:#fff;color:var(--text);box-shadow:none}
  .edit-pane .edit-head{position:sticky;top:calc(-12px - env(safe-area-inset-top));z-index:1;background:#fff;border-bottom:1px solid var(--line);padding:4px 0 12px;margin-bottom:15px}
  .edit-pane .edit-head a{display:grid;place-items:center;min-width:42px;min-height:42px;font-size:27px}
  .edit-pane form{display:block;min-width:0;width:100%}
  .edit-pane .quoted{max-height:140px;overflow:auto}
  .edit-pane textarea{min-height:150px}
  .edit-pane .actions{position:sticky;bottom:calc(-16px - env(safe-area-inset-bottom));background:#fff;padding:11px 0 calc(12px + env(safe-area-inset-bottom));border-top:1px solid var(--line)}
  .edit-pane .actions button{width:100%;min-height:48px}
}