:root{--navy: #0f2440;--navy-dark: #0a1a30;--brand: #2f6fed;--brand-dark: #2457c9;--alert: #ff7a3d;--alert-dark: #e8641f;--success: #1a9e6b;--bg: #f2f4f8;--border: #e2e6ed;--text: #1f2937;--text-muted: #6b7280;--text-faint: #9aa4b2}*{box-sizing:border-box}body{margin:0;font-family:-apple-system,Segoe UI,PingFang SC,Microsoft YaHei,sans-serif;background:var(--bg);color:var(--text)}.session-loading{height:100vh;display:flex;align-items:center;justify-content:center;color:var(--text-faint);font-size:13px}.login-screen{height:100vh;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,var(--navy) 0%,var(--navy-dark) 100%)}.login-card{background:#fff;padding:40px;border-radius:10px;box-shadow:0 20px 50px #00000059;width:340px;text-align:center}.login-logo{display:inline-block;font-size:13px;font-weight:700;letter-spacing:2px;color:#fff;background:var(--navy);padding:4px 12px;border-radius:999px;margin-bottom:14px}.login-card h1{font-size:19px;margin:0 0 10px}.login-card p{font-size:13px;color:var(--text-muted);line-height:1.5;margin:0}.login-tabs{display:flex;margin-top:20px;border:1px solid var(--border);border-radius:6px;overflow:hidden}.login-tabs button{flex:1;padding:8px;border:none;background:#f5f6f8;color:var(--text-muted);font-size:13px;cursor:pointer}.login-tabs button.active{background:var(--navy);color:#fff;font-weight:600}.login-card input,.login-card select{width:100%;padding:10px;margin:10px 0 0;border:1px solid var(--border);border-radius:4px;font-size:14px;background:#fff;color:var(--text)}.login-hint{font-size:11px;color:var(--text-faint);margin-top:6px;text-align:left}.login-error{color:#dc2626;font-size:12px;margin-top:10px;text-align:left}.login-submit{width:100%;padding:10px;margin-top:16px;background:var(--alert);color:#fff;border:none;border-radius:4px;font-size:14px;font-weight:600;cursor:pointer}.login-submit:hover:not(:disabled){background:var(--alert-dark)}.login-submit:disabled{background:#ccc;cursor:not-allowed}.app-shell{display:flex;flex-direction:column;height:100vh}.app-topbar{height:52px;flex:none;background:var(--navy);color:#fff;display:flex;align-items:center;justify-content:space-between;padding:0 16px}.app-topbar-brand{font-weight:700;font-size:15px;letter-spacing:1px;display:flex;align-items:baseline;gap:10px}.app-topbar-brand span{font-weight:400;font-size:12px;color:#b9c6de;letter-spacing:normal}.app-topbar-actions{display:flex;align-items:center;gap:14px}.app-topbar-create-workorder{background:var(--alert);color:#fff;border:none;border-radius:4px;padding:6px 12px;font-size:12px;font-weight:600;cursor:pointer}.app-topbar-create-workorder:hover:not(:disabled){background:var(--alert-dark)}.app-topbar-create-workorder:disabled{background:#7c869a;cursor:not-allowed}.app-topbar-user{font-size:12px;color:#cfd9ea;display:flex;align-items:center;gap:10px}.app-topbar-logout{background:transparent;border:1px solid #3a5578;color:#cfd9ea;border-radius:4px;padding:4px 10px;font-size:12px;cursor:pointer}.app-topbar-logout:hover{background:#1a3155}.app-layout{display:grid;grid-template-columns:260px 1fr;flex:1;min-height:0}.app-layout.with-workorder{grid-template-columns:260px 1fr 340px}.chat-list{background:#fff;border-right:1px solid var(--border);display:flex;flex-direction:column}.chat-list-header{display:flex;justify-content:space-between;align-items:center;padding:12px;border-bottom:1px solid var(--border);font-weight:600}.chat-list-header button{background:var(--alert);color:#fff;border:none;border-radius:4px;padding:6px 10px;cursor:pointer;font-size:12px;font-weight:600}.chat-list-header button:hover{background:var(--alert-dark)}.chat-list-items{overflow-y:auto;flex:1}.chat-list-item{padding:12px;border-bottom:1px solid #f5f5f5;cursor:pointer;border-left:3px solid transparent}.chat-list-item:hover{background:#f7f9fc}.chat-list-item.active{background:#eaf1ff;border-left-color:var(--brand)}.chat-list-item-title{font-weight:600;font-size:14px;margin-bottom:4px;display:flex;align-items:center;gap:6px}.chat-list-item-rename{display:flex;gap:4px;margin-bottom:4px}.chat-list-item-rename input{flex:1;min-width:0;padding:4px 6px;border:1px solid var(--border);border-radius:4px;font-size:13px}.chat-list-item-rename button{padding:4px 6px;border:none;border-radius:4px;background:var(--brand);color:#fff;cursor:pointer;font-size:12px}.chat-list-item-badge{font-size:10px;font-weight:600;color:var(--alert-dark);background:#fff1e8;border:1px solid #ffd9bd;padding:1px 6px;border-radius:999px}.chat-list-item-preview{font-size:12px;color:var(--text-muted);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.chat-list-item-time{font-size:11px;color:var(--text-faint);margin-top:2px}.chat-list-empty{padding:24px;text-align:center;color:var(--text-faint);font-size:13px;line-height:1.6}.chat-window{display:flex;flex-direction:column;background:#eaeef4;border-right:1px solid var(--border);min-height:0}.chat-window-header{padding:10px 14px;background:#fff;border-bottom:1px solid var(--border)}.chat-window-header-title{font-weight:600;font-size:14px;cursor:pointer}.chat-window-title-edit{display:flex;gap:4px}.chat-window-title-edit input{flex:1;padding:4px 6px;border:1px solid var(--border);border-radius:4px;font-size:14px;font-weight:600}.chat-window-title-edit button{padding:4px 8px;border:none;border-radius:4px;background:var(--brand);color:#fff;cursor:pointer;font-size:12px}.chat-window-header-sub{font-size:11px;color:var(--text-faint);margin-top:2px}.chat-window-messages{flex:1;overflow-y:auto;padding:16px}.chat-window-empty{text-align:center;color:var(--text-faint);font-size:12px;line-height:1.7;margin-top:24px;padding:0 24px}.message-row{margin-bottom:14px;display:flex;flex-direction:column}.message-row.mine{align-items:flex-end}.message-meta{font-size:11px;color:var(--text-faint);margin-bottom:3px}.message-edited-tag{margin-left:4px;font-style:italic}.message-edit{display:flex;gap:4px;max-width:60%}.message-edit input{flex:1;padding:6px 8px;border:1px solid var(--border);border-radius:4px;font-size:14px}.message-edit button{padding:6px 8px;border:none;border-radius:4px;background:var(--brand);color:#fff;cursor:pointer;font-size:12px}.message-bubble{background:#fff;padding:8px 12px;border-radius:6px;max-width:60%;font-size:14px;box-shadow:0 1px 2px #0000000f}.message-row.mine .message-bubble{background:#dbe7ff}.message-bubble img,.message-bubble video{max-width:240px;max-height:240px;border-radius:4px;display:block}.message-recalled{text-align:center;font-size:12px;color:var(--text-faint);margin:6px 0 14px}.context-menu{position:fixed;background:#fff;border:1px solid var(--border);border-radius:6px;box-shadow:0 4px 16px #00000026;padding:4px;z-index:30}.context-menu button{display:block;width:100%;padding:6px 18px;border:none;background:none;text-align:left;font-size:13px;color:var(--text);cursor:pointer;border-radius:4px;white-space:nowrap}.context-menu button:hover{background:#f2f4f8}.chat-window-attachments{display:flex;gap:8px;padding:10px 12px 0;background:#fff}.attachment-thumb{position:relative;width:56px;height:56px}.attachment-thumb img,.attachment-thumb video{width:56px;height:56px;object-fit:cover;border-radius:4px;border:1px solid var(--border);display:block}.attachment-remove{position:absolute;top:-6px;right:-6px;width:18px;height:18px;border-radius:50%;border:none;background:#0009;color:#fff;font-size:12px;line-height:1;cursor:pointer;display:flex;align-items:center;justify-content:center;padding:0}.chat-window-input{display:flex;align-items:center;gap:8px;padding:12px;background:#fff;border-top:1px solid var(--border)}.chat-window-input input[type=text],.chat-window-input input:not([type]){flex:1;padding:10px;border:1px solid var(--border);border-radius:4px;font-size:14px}.chat-window-input button{background:var(--brand);color:#fff;border:none;border-radius:4px;padding:10px 14px;cursor:pointer}.chat-window-input button:hover{background:var(--brand-dark)}.workorder-panel{background:#fff;overflow-y:auto;padding:16px}.workorder-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:4px;font-weight:700;font-size:16px}.workorder-hint{font-size:11px;color:var(--text-faint);margin-bottom:14px}.workorder-actions{display:flex;gap:6px}.workorder-actions button:first-child{background:var(--alert)}.workorder-actions button:first-child:hover:not(:disabled){background:var(--alert-dark)}.workorder-actions button{background:var(--brand);color:#fff;border:none;border-radius:4px;padding:6px 10px;font-size:12px;font-weight:600;cursor:pointer}.workorder-actions button:hover:not(:disabled){background:var(--brand-dark)}.workorder-actions button:disabled{background:#ccc;cursor:not-allowed}.workorder-error{color:#dc2626;font-size:12px;margin-bottom:8px}.workorder-field{margin-bottom:14px;border-bottom:1px solid #f0f0f0;padding-bottom:10px}.workorder-field-label{font-size:14px;font-weight:700;letter-spacing:.2px;color:var(--text);margin-bottom:5px}.workorder-field-value{font-size:15px;font-weight:500;color:var(--text);cursor:pointer;min-height:20px}.workorder-field-value.empty{font-size:12px;font-weight:400;font-style:italic;color:var(--text-faint)}.workorder-field-edit{display:flex;gap:4px}.workorder-field-edit input{flex:1;padding:6px;border:1px solid var(--border);border-radius:4px}.workorder-field-edit button{padding:6px 8px;border:none;border-radius:4px;background:var(--brand);color:#fff;cursor:pointer;font-size:12px}.workorder-photos{display:flex;flex-wrap:wrap;gap:6px}.workorder-photos img,.workorder-photos video{width:60px;height:60px;object-fit:cover;border-radius:4px;border:1px solid var(--border)}.media-thumb{position:relative;width:60px;height:60px}.media-thumb img,.media-thumb video{width:60px;height:60px;object-fit:cover;border-radius:4px;border:1px solid var(--border);display:block}.media-delete{position:absolute;top:-6px;right:-6px;width:18px;height:18px;line-height:16px;padding:0;border:none;border-radius:50%;background:var(--danger, #e5484d);color:#fff;font-size:12px;cursor:pointer}.media-add{width:58px;height:58px;display:flex;align-items:center;justify-content:center;border:1px dashed var(--border);border-radius:4px;color:var(--text-faint);font-size:18px;cursor:pointer}.review-media-list{display:flex;flex-wrap:wrap;gap:6px;margin:4px 0}.empty-hint{font-size:12px;font-style:italic;color:var(--text-faint)}.workorder-history{margin-top:16px}.workorder-history-title{font-weight:700;font-size:13px;margin-bottom:8px;color:var(--text)}.workorder-history-empty{font-size:12px;color:var(--text-faint)}.workorder-update-block{padding:10px 0;border-bottom:1px dashed #eee}.workorder-update-header{margin-bottom:6px}.workorder-update-seq{display:block;font-size:14px;font-weight:700;color:var(--brand-dark);white-space:nowrap}.workorder-update-meta{display:block;font-size:12px;color:var(--text-muted);margin-top:2px}.workorder-update-change{font-size:12px;color:var(--text-muted);line-height:1.5;padding:4px 0 4px 10px;border-left:2px solid #eee;margin-bottom:4px}.workorder-update-change-title{color:var(--text)}.workorder-update-provider{color:var(--text-faint)}.empty-state{display:flex;align-items:center;justify-content:center;color:var(--text-faint)}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#0f244073;display:flex;align-items:center;justify-content:center;z-index:20}.modal-card{background:#fff;width:380px;max-height:80vh;overflow-y:auto;border-radius:8px;padding:20px;box-shadow:0 20px 50px #0000004d}.modal-header{display:flex;justify-content:space-between;align-items:center;font-weight:700;font-size:16px;margin-bottom:16px}.modal-close{background:none;border:none;font-size:20px;line-height:1;cursor:pointer;color:var(--text-faint)}.modal-label{display:block;font-size:12px;color:var(--text-muted);margin:12px 0 6px}.modal-card>input{width:100%;padding:8px;border:1px solid var(--border);border-radius:4px;font-size:13px}.modal-colleagues{max-height:180px;overflow-y:auto;border:1px solid var(--border);border-radius:4px}.modal-colleague-item{display:flex;align-items:center;gap:8px;padding:8px 10px;font-size:13px;border-bottom:1px solid #f5f5f5;cursor:pointer}.modal-colleague-item:last-child{border-bottom:none}.modal-empty{padding:16px;text-align:center;color:var(--text-faint);font-size:12px}.modal-checkbox-row{display:flex;align-items:center;gap:8px;font-size:13px;margin-top:14px;cursor:pointer}.modal-error{color:#dc2626;font-size:12px;margin-top:10px}.modal-actions{display:flex;justify-content:flex-end;gap:8px;margin-top:18px}.modal-cancel{padding:8px 14px;border:1px solid var(--border);background:#fff;border-radius:4px;cursor:pointer;font-size:13px}.modal-submit{padding:8px 14px;border:none;background:var(--alert);color:#fff;border-radius:4px;cursor:pointer;font-size:13px;font-weight:600}.modal-submit:hover:not(:disabled){background:var(--alert-dark)}.modal-submit:disabled{background:#ccc;cursor:not-allowed}.review-hint{font-size:12px;color:var(--text-muted);margin-bottom:12px}.review-changes{max-height:320px;overflow-y:auto;border:1px solid var(--border);border-radius:6px}.review-change-item{padding:10px 12px;border-bottom:1px solid #f0f0f0}.review-change-item:last-child{border-bottom:none}.review-change-label{font-size:13px;font-weight:700;color:var(--text);display:flex;align-items:center;gap:8px;margin-bottom:4px}.review-change-action{font-size:10px;font-weight:600;padding:1px 6px;border-radius:999px}.review-change-action.create{color:var(--success);background:#e6f7ee;border:1px solid #b8e8cf}.review-change-action.update{color:var(--brand-dark);background:#eaf1ff;border:1px solid #bdd3fb}.review-change-old{font-size:12px;color:var(--text-faint);text-decoration:line-through;margin-bottom:2px}.review-change-new{font-size:13px;color:var(--text)}.review-change-edit{display:flex;align-items:center;gap:4px;font-size:13px;color:var(--text)}.review-change-edit input{flex:1;padding:4px 6px;border:1px solid var(--border);border-radius:4px;font-size:13px}.review-change-provider{font-size:11px;color:var(--text-faint);margin-top:2px}