:root{--sidebar-width:260px;--header-height:52px;--mail-list-width:380px;--color-bg:#fff;--color-bg-secondary:#f5f5f5;--color-bg-hover:#efefef;--color-bg-active:#e8f0fe;--color-border:#e0e0e0;--color-text:#1a1a1a;--color-text-secondary:#666;--color-text-muted:#999;--color-primary:#0078d4;--color-primary-hover:#106ebe;--color-danger:#d13438;--color-warning:#f7630c;--color-success:#107c10;--color-unread:#0078d4;--color-flag:#f7630c;--font-sans:"Segoe UI", -apple-system, BlinkMacSystemFont, sans-serif;--font-mono:"Cascadia Code", "Fira Code", monospace;--radius-sm:4px;--radius-md:8px;--radius-lg:12px;--shadow-sm:0 1px 2px #00000014;--shadow-md:0 2px 8px #0000001f;--shadow-lg:0 4px 16px #00000029}*{box-sizing:border-box;margin:0;padding:0}html,body,#root{height:100%;font-family:var(--font-sans);color:var(--color-text);background:var(--color-bg);font-size:14px}a{color:var(--color-primary);text-decoration:none}a:hover{text-decoration:underline}button{font-family:inherit;font-size:inherit;cursor:pointer}input,textarea,select{font-family:inherit;font-size:inherit}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:0 0}::-webkit-scrollbar-thumb{background:#c1c1c1;border-radius:4px}::-webkit-scrollbar-thumb:hover{background:#a1a1a1}.app-layout{height:100%;display:flex;overflow:hidden}.app-sidebar{width:var(--sidebar-width);min-width:var(--sidebar-width);background:var(--color-bg-secondary);border-right:1px solid var(--color-border);flex-direction:column;display:flex;overflow:hidden}.app-main{flex-direction:column;flex:1;display:flex;overflow:hidden}.app-header{height:var(--header-height);min-height:var(--header-height);border-bottom:1px solid var(--color-border);background:var(--color-bg);align-items:center;gap:12px;padding:0 16px;display:flex}.app-content{flex:1;display:flex;overflow:hidden}.mail-list-panel{width:var(--mail-list-width);min-width:var(--mail-list-width);border-right:1px solid var(--color-border);flex-direction:column;display:flex;overflow:hidden}.mail-list-header{border-bottom:1px solid var(--color-border);justify-content:space-between;align-items:center;gap:8px;padding:12px 16px;display:flex}.mail-list-header h2{font-size:16px;font-weight:600}.mail-list-scroll{flex:1;overflow-y:auto}.mail-item{border-bottom:1px solid var(--color-border);cursor:pointer;gap:12px;padding:12px 16px;transition:background .1s;display:flex}.mail-item:hover{background:var(--color-bg-hover)}.mail-item.active{background:var(--color-bg-active)}.mail-item.unread{border-left:3px solid var(--color-unread)}.mail-item-content{flex:1;min-width:0}.mail-item-header{justify-content:space-between;align-items:center;gap:8px;margin-bottom:2px;display:flex}.mail-item-sender{white-space:nowrap;text-overflow:ellipsis;font-size:13px;font-weight:600;overflow:hidden}.mail-item.unread .mail-item-sender{color:var(--color-unread)}.mail-item-date{color:var(--color-text-muted);white-space:nowrap;font-size:11px}.mail-item-subject{white-space:nowrap;text-overflow:ellipsis;margin-bottom:2px;font-size:13px;font-weight:500;overflow:hidden}.mail-item-preview{color:var(--color-text-secondary);white-space:nowrap;text-overflow:ellipsis;font-size:12px;overflow:hidden}.mail-item-indicators{align-items:center;gap:6px;display:flex}.mail-item-indicators .icon{font-size:12px}.reading-pane{flex-direction:column;flex:1;display:flex;overflow:hidden}.reading-pane-empty{color:var(--color-text-muted);flex:1;justify-content:center;align-items:center;font-size:15px;display:flex}.reading-pane-header{border-bottom:1px solid var(--color-border);padding:16px 24px}.reading-pane-subject{margin-bottom:12px;font-size:20px;font-weight:600}.reading-pane-meta{color:var(--color-text-secondary);align-items:center;gap:12px;font-size:13px;display:flex}.reading-pane-sender{color:var(--color-text);font-weight:600}.reading-pane-actions{border-bottom:1px solid var(--color-border);align-items:center;gap:4px;padding:8px 24px;display:flex}.reading-pane-body{flex:1;padding:0;overflow-y:auto}.reading-pane-body iframe{border:none;width:100%;min-height:300px}.sidebar-header{justify-content:space-between;align-items:center;padding:12px 16px;display:flex}.sidebar-user{border-bottom:1px solid var(--color-border);align-items:center;gap:10px;padding:12px 16px;display:flex}.sidebar-user-avatar{background:var(--color-primary);color:#fff;border-radius:50%;justify-content:center;align-items:center;width:36px;height:36px;font-size:14px;font-weight:600;display:flex}.sidebar-user-info{flex:1;min-width:0}.sidebar-user-name{white-space:nowrap;text-overflow:ellipsis;font-size:13px;font-weight:600;overflow:hidden}.sidebar-user-email{color:var(--color-text-muted);white-space:nowrap;text-overflow:ellipsis;font-size:11px;overflow:hidden}.sidebar-nav{flex:1;padding:8px 0;overflow-y:auto}.sidebar-section-label{text-transform:uppercase;color:var(--color-text-muted);letter-spacing:.5px;padding:8px 16px 4px;font-size:11px;font-weight:600}.folder-item{cursor:pointer;text-align:left;width:100%;color:var(--color-text);background:0 0;border:none;align-items:center;gap:10px;padding:8px 16px;font-size:13px;transition:background .1s;display:flex}.folder-item:hover{background:var(--color-bg-hover)}.folder-item.active{background:var(--color-bg-active);color:var(--color-primary);font-weight:600}.folder-item .folder-icon{justify-content:center;align-items:center;width:20px;font-size:18px;display:flex}.folder-item .folder-name{flex:1}.folder-item .folder-count{background:var(--color-primary);color:#fff;border-radius:10px;padding:1px 7px;font-size:11px;font-weight:600}.folder-item .folder-count.zero{display:none}.btn{border-radius:var(--radius-sm);border:1px solid var(--color-border);background:var(--color-bg);color:var(--color-text);white-space:nowrap;align-items:center;gap:6px;padding:6px 14px;font-size:13px;font-weight:500;transition:all .1s;display:inline-flex}.btn:hover{background:var(--color-bg-hover)}.btn-primary{background:var(--color-primary);color:#fff;border-color:var(--color-primary)}.btn-primary:hover{background:var(--color-primary-hover)}.btn-danger{color:var(--color-danger);border-color:var(--color-danger)}.btn-danger:hover{background:#fde7e9}.btn-icon{border-radius:var(--radius-sm);color:var(--color-text-secondary);background:0 0;border:none;justify-content:center;align-items:center;padding:6px;display:inline-flex}.btn-icon:hover{background:var(--color-bg-hover);color:var(--color-text)}.compose-overlay{z-index:100;background:#0000004d;justify-content:flex-end;align-items:flex-end;padding:20px;display:flex;position:fixed;inset:0}.compose-window{background:var(--color-bg);border-radius:var(--radius-lg);width:640px;max-height:80vh;box-shadow:var(--shadow-lg);flex-direction:column;display:flex;overflow:hidden}.compose-header{background:var(--color-primary);color:#fff;justify-content:space-between;align-items:center;padding:12px 16px;display:flex}.compose-header h3{font-size:14px;font-weight:600}.compose-fields{border-bottom:1px solid var(--color-border);padding:8px 16px}.compose-field{border-bottom:1px solid var(--color-border);align-items:center;gap:8px;padding:6px 0;display:flex}.compose-field:last-child{border-bottom:none}.compose-field label{color:var(--color-text-secondary);min-width:50px;font-size:13px}.compose-field input{border:none;outline:none;flex:1;padding:4px 0;font-size:13px}.compose-body{flex:1;min-height:250px;overflow-y:auto}.compose-body .tiptap{outline:none;min-height:230px;padding:12px 16px}.compose-body .tiptap p{margin:0 0 8px}.compose-footer{border-top:1px solid var(--color-border);justify-content:space-between;align-items:center;gap:8px;padding:10px 16px;display:flex}.compose-toolbar{border-bottom:1px solid var(--color-border);align-items:center;gap:2px;padding:4px 16px;display:flex}.search-bar{background:var(--color-bg-secondary);border:1px solid var(--color-border);border-radius:var(--radius-md);flex:1;align-items:center;gap:8px;max-width:500px;padding:6px 12px;display:flex}.search-bar input{background:0 0;border:none;outline:none;flex:1;font-size:13px}.search-bar .search-icon{color:var(--color-text-muted);font-size:16px}.login-page{background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);justify-content:center;align-items:center;height:100%;display:flex}.login-card{border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);text-align:center;background:#fff;width:100%;max-width:420px;padding:48px}.login-card h1{color:var(--color-text);margin-bottom:8px;font-size:28px;font-weight:700}.login-card p{color:var(--color-text-secondary);margin-bottom:32px;font-size:15px}.login-card .btn-primary{border-radius:var(--radius-md);padding:12px 32px;font-size:15px}.login-logo{margin-bottom:20px;font-size:48px}.badge{border-radius:10px;padding:2px 8px;font-size:11px;font-weight:500}.badge-high{color:var(--color-danger);background:#fde7e9}.badge-low{color:var(--color-success);background:#e6f7e6}.loading-spinner{color:var(--color-text-muted);justify-content:center;align-items:center;padding:40px;display:flex}.loading-spinner:after{content:"";border:3px solid var(--color-border);border-top-color:var(--color-primary);border-radius:50%;width:24px;height:24px;animation:.8s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}.empty-state{color:var(--color-text-muted);text-align:center;flex-direction:column;justify-content:center;align-items:center;padding:60px 20px;display:flex}.empty-state .icon{opacity:.5;margin-bottom:16px;font-size:48px}.empty-state p{font-size:15px}.calendar-grid{background:var(--color-border);flex:1;grid-template-columns:80px 1fr;gap:1px;display:grid;overflow-y:auto}.calendar-time{color:var(--color-text-muted);background:var(--color-bg);text-align:right;padding:8px;font-size:11px}.calendar-slot{background:var(--color-bg);border-bottom:1px solid var(--color-border);min-height:48px;padding:4px 8px}.calendar-event{background:var(--color-bg-active);border-left:3px solid var(--color-primary);border-radius:var(--radius-sm);margin-bottom:2px;padding:4px 8px;font-size:12px}.calendar-event-title{font-size:12px;font-weight:600}.calendar-event-time{color:var(--color-text-secondary);font-size:11px}.contacts-list{padding:8px}.contact-item{border-radius:var(--radius-sm);cursor:pointer;align-items:center;gap:12px;padding:10px 12px;transition:background .1s;display:flex}.contact-item:hover{background:var(--color-bg-hover)}.contact-avatar{background:var(--color-primary);color:#fff;border-radius:50%;justify-content:center;align-items:center;width:40px;height:40px;font-size:16px;font-weight:600;display:flex}.contact-info{flex:1}.contact-name{font-size:13px;font-weight:600}.contact-email{color:var(--color-text-secondary);font-size:12px}.tabs{border-bottom:1px solid var(--color-border);display:flex}.tab{color:var(--color-text-secondary);cursor:pointer;background:0 0;border:none;border-bottom:2px solid #0000;padding:10px 20px;font-size:13px;font-weight:500;transition:all .15s}.tab:hover{color:var(--color-text)}.tab.active{color:var(--color-primary);border-bottom-color:var(--color-primary)}.attachment-list{flex-wrap:wrap;gap:8px;padding:8px 24px;display:flex}.attachment-chip{background:var(--color-bg-secondary);border:1px solid var(--color-border);border-radius:var(--radius-sm);cursor:pointer;align-items:center;gap:6px;padding:6px 12px;font-size:12px;transition:background .1s;display:flex}.attachment-chip:hover{background:var(--color-bg-hover)}.attachment-chip .icon{color:var(--color-primary);font-size:16px}.modal-overlay{z-index:500;background:#0006;justify-content:center;align-items:center;display:flex;position:fixed;inset:0}.modal-content{background:var(--color-bg);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);max-height:80vh;overflow-y:auto}.modal-header{border-bottom:1px solid var(--color-border);justify-content:space-between;align-items:center;padding:16px 20px;display:flex}.modal-header h2{font-size:16px;font-weight:600}@media (width<=900px){.app-sidebar{z-index:200;transition:left .2s;position:fixed;top:0;bottom:0;left:-260px}.app-sidebar.open{box-shadow:var(--shadow-lg);left:0}.mail-list-panel{width:100%;min-width:100%}.reading-pane{z-index:150;background:var(--color-bg);position:fixed;inset:0}}